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1
Avdeenko, Anatoly P., Mitar Lutovac, Svetlana A. Konovalova, and Mykhailo V. Fedorynov. "Investigation of Efficiency of Use of High-Temperature Greases in Steel Rolling - Part 2." Applied Mechanics and Materials 806 (November 2015): 10–15. http://dx.doi.org/10.4028/www.scientific.net/amm.806.10.
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We investigated the friction coefficients (steel-to-steel) for various rolling pressures on application of consistent anti-wear, antiwelding, and metal-cladding greases and 11 metal-working coolants. The protective grease ХАDО (Ukraine) and import anti-wear greases Mol Favorit-2, Shell Albida, and Mobil 461 were found to be effective in steel rolling. The greases containing molybdenum disulfide don’t have high greasing properties in steel rolling, i.e. at plastic deformations of steels. The surface-active substances PEG-4 (Rapeseedamine) and polyoxyethylene alkylether of carboxylic acids (AKYPO RO 90 and AKYPO RO 20) are suitable for creation of new technological metal-working coolants for steel rolling. Considerable decrease in friction coefficient is observed in steel rolling at use of a technological liquid “Universal-1TC”.
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Melnyk, Tetyana, and Kateryna Pugachevska. "PRIORITIES OF UKRAINE’S EXPORT DEVELOPMENT IN THE CONDITIONS OF EUROPEAN INTEGRATION." JOURNAL OF EUROPEAN ECONOMY, Vol 17, No 2 (2018) (2018): 209–23. http://dx.doi.org/10.35774/jee2018.02.209.
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A comparative analysis of the coefficient of participation in the international division of labor and the coefficient of export efficiency of Ukraine and its main trading partners have been carried out. The indicators of development of goods and services exports to the EU countries are analyzed. On the basis of the «Input-Output» tables export orientation, import dependence and structure of import flows of certain types of economic activity were calculated. It is determined that the low share of imports in accumulation on the background of domestic science inability to produce innovative and technologically advanced products shows conservatism in industrial policy and production on a morally and technically obsolete equipment that does not meet the requirements of scientific and technological progress. Most likely, Ukraine’s export potential will be stimulated by the growth of demand from key partners from the EU, but it is worth noting that the rise in prices of goods for intermediate consumption from abroad, as well as the deterioration of price terms of trade, will restrain the possibility of increasing Ukraine’s exports.
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Adi, Lumadya. "INTENSITAS PERDAGANGAN INTRA-REGIONAL DALAM ASEAN-3 (Indonesia, Malaysia, dan Thailand)." Jurnal Riset Ekonomi dan Manajemen 17, no. 2 (2017): 313. http://dx.doi.org/10.17970/jrem.17.1702012.id.
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ABSTRACT The purpose of this paper is to test the intra-regional trade in the ASEAN-3 includes: Indonesia, Malaysia and Thailand. Analysis tool is: Intensity of intra-regional trade. The advantage of this analysis tool is a country is known to include density of intra-export or density of intra-import: if positive then the country belong to the density of intra-export; and if negative, including the density of intra-import. Study in period 2000-2014. Based on the intensity of intra-regional trade: Indonesia, Malaysia, and Thailand has a coefficient equally negative meaning because all three are density of intra-import; The third country that has no comparative advantage. Indonesia, Malaysia, and Thailand have the same density intra-import commodity that must strive harder to improve efficiency.
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Huang, Huiping, Jiangfeng Wang, Yuping Han, Lei Wang, and Xinsheng Li. "Assessing impacts of water regulations on alleviating regional water stress with a system dynamics model." Water Supply 19, no. 2 (2018): 635–43. http://dx.doi.org/10.2166/ws.2018.112.
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Abstract Many areas around the world are faced with water scarcity and virtual water can provide ways to resolve the problem. This paper presents a comprehensive water system based on a system dynamics model to assess how water regulations from the viewpoint of virtual water affect the regional water stress index in the Haihe River Basin, China. The results show that green water absorption, blue water consumption, virtual water flow, and water use efficiency play important roles in the water resources system. Water stress can be relieved by improving the infiltration coefficient, irrigation efficiency, industrial water use efficiency, and virtual water import.
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Shi, Jiu Sheng, Fei Peng, and Bing Wen Zhang. "The Influence of Excess Air Coefficient of Boiler Efficiency." Applied Mechanics and Materials 409-410 (September 2013): 548–52. http://dx.doi.org/10.4028/www.scientific.net/amm.409-410.548.
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Excess air coefficient has an important impact on the combustion conditions of boiler and thermal efficiency, analysis shows that the furnace temperature and the combustion efficiency is the linear relation of one to one correspondence. Any combustion conditions, there is an optimum excess air coefficient makes the top of furnace temperature, thus it can establish a control relationship, furnace temperature is optimization index, excess air coefficient is disturbance.It can achieve the purpose of improving the efficiency of boiler combustion.
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Khomutenko, A., V. Khomutenko, and V. Drachenko. "Information and analytical review of tax revenues from import operations." Galic'kij ekonomičnij visnik 66, no. 5 (2020): 120–30. http://dx.doi.org/10.33108/galicianvisnyk_tntu2020.05.120.
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The importance of tax regulation of foreign economic activity is analyzed in this paper. The dynamics and structure of tax revenues to the State Budget of Ukraine are analyzed as well. Comparative analysis of VAT revenues from goods (works, services) produced in Ukraine and imported into its customs territory is carried out. The relationship between imports and VAT receipts of and excise duty on imported goods is determined. The dynamics and structure of excise duty revenues and import duties are investigated. The factors influencing the change of indicators of tax revenues from import operations are determined. Fiscal efficiency and taxes elasticity coefficient levied on imports are calculated. The regulatory role of special duties types (compensatory, special, anti-dumping), which are collected in order to protect the national producer and consumer is proved. Monitoring of additional customs receipts is carried out as a result of customs value correction by customs authorities. The preconditions and factors influencing the change in the volume of taxes on import transactions are identified. The necessity of improving the mechanism of collecting taxes on import operations is substantiated. It is proposed to reduce VAT rates, which depend on goods saturation in domestic market. Proposal to introduce the reduction factor to the duty rates used in order to stimulate critical and socially significant imports, as well as to investment goods imported into the customs territory of Ukraine is put forward. It seems that the tax policy in terms of import operations should be aimed at ensuring the rational commodity and geographical structure of imports, promoting domestic products competitiveness strengthening and protection domestic market and domestic producers. It is proposed to improve the mechanism of tax administration, which primarily involves focusing on working with dishonest taxpayers, exposing tax evasion schemes, providing appropriate tax collection services to honest taxpayers.
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Thonse Hawaldar, Iqbal, Bharat Kumar Meher, Puja Kumari, and Santosh Kumar. "Modelling the effects of capital adequacy, credit losses, and efficiency ratio on return on assets and return on equity of banks during COVID-19 pandemic." Banks and Bank Systems 17, no. 1 (2022): 115–24. http://dx.doi.org/10.21511/bbs.17(1).2022.10.
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The study aims to determine the impact of Capital Adequacy Ratio, Credit Losses Ratio and Efficiency Ratio on the two significant profitability ratios, namely Return on Assets (ROA) and Return on Equity (ROE), during the pandemic. Panel Data Regression is used to model the effects of Capital Adequacy, Credit Losses and Efficiency Ratio on Return on Assets and Return on Equity of Indian banks. A suitable model has been developed by analyzing the results of the Hausman test and the p-values. It has been found that Capital Adequacy Ratio (CAR) with coefficient value of –0.664, CET1 with coefficient value of 1.83 and efficiency ratio with coefficient value of 1.825 have significantly affected the return on assets as their p-values are less than 0.05. However, the accepted relationship between CAR and ROA, efficiency ratio and ROA were inverse, but their coefficients were significant. The provision for credit losses (PCL) was not affecting the ROA significantly during the pandemic and hence was not considered while framing the model. Again, the dependent variable is the return on equity, except CAR. Other ratios, i.e., CET1, efficiency ratio, and PCL ratio have unacceptable correlations and are even non-significant as their p-values are less than 0.05.
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Liu, Xiaolan, Xianmin Zhang, and Yadong Wang. "A Rapid Detection Method for Bridges Based on Impact Coefficient of Standard Bumping." Mathematical Problems in Engineering 2018 (September 30, 2018): 1–14. http://dx.doi.org/10.1155/2018/9195289.
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The evaluation method of load transfer efficiency using falling weight deflectometer is unworkable in remote mountain areas and transportation difficult region. Therefore, a novation method of load transfer efficiency evaluation is proposed using the index of amplitude ratio. Finite element method is applied to study the influence of dowel bar parameters (diameter, length, spacing, and elastic modulus) and pavement structures parameters (thickness and modulus) on load transfer efficiency, frequency, and the ratio of amplitude. Results of finite element model show that the effects of dowel bar and pavement structure parameters on load transfer efficiency and the ratio of amplitude are similar. The load transfer efficiency, frequency, and the ratio of amplitude enhance with the increase of dowel bar diameter, length, and elastic modulus and the decrease of dowel bar spacing. The subgrade modulus has more significant influence on the load transfer efficiency, frequency, and the ratio of amplitude than other pavement parameters. Polynomial function method is utilized to established load transfer mode between deflection-based load transfer efficiency and the ratio of amplitude. The feasibility and reliability of new method is verified by static and dynamic load test. All results are helpful for the development of highway engineering and airport engineering.
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Zhao, Hai Tian, Yan Peng Hu, and Qi Yao. "Equivalent Luminous Efficiency - A Normalization Index to Luminous Efficiency of Luminaries." Advanced Materials Research 760-762 (September 2013): 429–33. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.429.
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The luminous efficiency do make four impact factors confused such as existing of dissipated light, ability for transmission of lighting sources, distortion of visual effects and different values of power choosing during the luminous efficiency comparison under its current definition. In this paper, the equivalent luminous efficiency was introduced based on the discussion of these factors which maintains the form of current definition of luminous efficiency while it sets the equivalent coefficient to make test results comparable under different measurement conditions, so as to be clear when we compare and evaluate the properties of energy-saving and luminescence of luminaries.
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Wu, Zhi Jiang, and Yan Sheng Xu. "Water Mass Flow and Air Relative Humidity on Performance of Air - Source Heat Pump Water Heater." Advanced Materials Research 1092-1093 (March 2015): 127–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.127.
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The water mass flow and air relative humidity on the performance of air-source heat pump water heater was discussed in this paper. The results show that the energy efficiency of heat pump water heater is improved by correct the water mass flow and discharge pressure can be reduced, the value of the condenser temperature difference between the import and export of water also can be reduced. Increasing the air relative humidity, the more condensated water on evaporator surface effective, the greater the wetting area. In addition, the heat transfer of latent heat can be increased by the growth of air side and refrigerant side heat transfer coefficient.
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Zhang, Yubing, Yong Wang, Guang Sun, Jiazhen Han, and Yudong Xie. "EFFECTS OF TWO TYPES OF CONTROLLABLE DEFORMATION ON ENERGY EXTRACTION OF A FLEXIBLE HYDROFOIL." Brodogradnja 73, no. 1 (2022): 109–26. http://dx.doi.org/10.21278/brod73106.
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Energy extraction capacity of controllably flexible hydrofoil was studied under two identified deformation modes. Deformation modes, flexure parameters (flexure amplitude and flexure coefficient ) and motion parameters (reduced frequency f* and pitching amplitude 0) were investigated to understand the effects of controllably flexible deformation on energy extraction. The results reveal that deformation modes affect the effective angle of attack and vortex structure, which influence hydrodynamic performance. The energy extraction capacity improves from the deformation mode 2 to the rigid hydrofoil and then to the deformation mode 1. Under the deformation mode 1, lift, moment and power coefficients are increased obviously with the increase of , while they increase slightly with . Power coefficients and efficiency are sensitive to , which influences the development of leading-edge vortices. The flexible coefficient affects the wake structure, which has less impact on variation of force coefficient. As the increase in f*, averaged power coefficients firstly increase and then decrease. Further, the optimal f* is subjected to 0. Interestingly, a critical reduced frequency f*s, which is generally increase with increasing 0, was found under three modes. The condition that f* > f*s. is a prerequisite for subsequent adjustments of flexure modes and parameters according to different requirement of power coefficient under different tidal currents. The range of high efficiency () is: deformation mode 1 (36.1%<<54.3%) > rigid hydrofoils (34.2%<<41%) > deformation mode 2 (26.9%<<30.3%).
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Ukhina, H., A. Bilenko, and V. Sytnikov. "Improving Efficiency of NPP Software Based I&C." Nuclear and Radiation Safety, no. 3(71) (August 15, 2016): 71–76. http://dx.doi.org/10.32918/nrs.2016.3(71).13.
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The paper considers improving efficiency of NPP software based I&C during adjustment and readjustment of its characteristics. The research analyzes impact of transfer function coefficient of digital components on features of frequency-response characteristics, which shall be considered during design of software based I&C. The paper objective was to determine the numerator and denominator dependencies of transfer function of first order high-pass and low-pass digital filters of cut-off frequency, and also to determine dependencies on pulsation coefficient.
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Żyłła, Renata, Magdalena Foszpańczyk, Irena Kamińska, Marcin Kudzin, Jacek Balcerzak, and Stanisław Ledakowicz. "Impact of Polymer Membrane Properties on the Removal of Pharmaceuticals." Membranes 12, no. 2 (2022): 150. http://dx.doi.org/10.3390/membranes12020150.
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The influence of various factors on the removal efficiency of selected pharmaceuticals by membrane filtration was investigated. Several commercial polymer membranes were used for nanofiltration (NF) from various manufacturers. The studies were conducted for ibuprofen (IBF), amoxicillin (AMX), diclofenac (DCF), tetracycline (TRC), salicylic acid (SA) and acetylsalicylic acid (ASA). The influence of the structure and properties of the tested compounds on the retention coefficient and filtration rate was investigated. The influence of pH on the filtration parameters was also checked. The properties of selected membranes influencing the retention of pharmaceuticals and filtrate flux were analysed. An extensive analysis of the retention coefficients dependence on the contact angle and surface free energy was performed. It was found that there is a correlation between the hydrophilicity of the membrane and the effectiveness and efficiency of the membrane. As the contact angle of membrane increased, the flow rate of the filtrate stream increased, while the retention coefficient decreased. The studies showed that the best separation efficiency was achieved for compounds with a molecular weight (MW) greater than 300 g/mol. During the filtration of pharmaceuticals with MW ranging from 300 to 450 g/mol, the type of membrane used practically did not affect the filtration efficiency and a high degree of retention was achieved. In the case of low MW molecules (SA and ASA), a significant decrease in the separation efficiency during the process was noted.
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Nascimento Filho, Aloisio S., Hugo Saba, Rafael G. O. dos Santos, et al. "Analysis of Hydrous Ethanol Price Competitiveness after the Implementation of the Fossil Fuel Import Price Parity Policy in Brazil." Sustainability 13, no. 17 (2021): 9899. http://dx.doi.org/10.3390/su13179899.
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Competition is a relevant element in any open economy. Public policies are necessary to induce economic efficiency and to create conditions to preserve or stimulate a competitive environment. This paper aims to assess the competitiveness of hydrous ethanol price in a period of political, social and economic crises, in 15 Brazilian state capitals between the years 2012 and 2019. We compared the ethanol–gasoline price ratio behavior in two different periods, before and after the import parity price policy implemented by Petrobras in 2016. Mann–Whitney and Levene’s tests, two non-parametric statistical methods, were applied to verify significant changes between these periods. The implementation of changes in Petrobras’ pricing policy from 2016 onwards caused a statistically significant increase in the ratio coefficient of variation in two-thirds of the distribution market and more than the half of analyzed retail markets. Second, overall, the cities that showed statistically significant changes in the median and coefficient of variation in the distribution market price ratio were followed by the retail market. Our findings suggest that government interventions in the fuel and byproduct final selling prices to distributors negatively impact competition between companies that are part of the fuel distribution and retail chain, also affecting the sale of biofuels in Brazil and discouraging the initiatives to use renewable fuels to reduce the emission of pollutants.
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Qian, Chun Jie, Ji Li Tu, Hua Yun Ge, and Jin Qiang Liu. "Impact of Soft Nursing Care on Drying Efficiency of Cotton Fabric." Advanced Materials Research 331 (September 2011): 9–13. http://dx.doi.org/10.4028/www.scientific.net/amr.331.9.
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The performance of heat transfer coefficient, wicking and water vapour permeability (WVP) of cotton fabric were tested after adding amino-functional silicone softening agent in simulating process of home laundry. Meanwhile, the experiment of line drying of fabric soaked in water after spinning was designed to study the impact of soft nursing care on drying efficiency of fabric. The result showed that with the amino-functional silicone softening agent added, handle was improved obviously. With the concentration of softening agent increasing, WVP of fabric increased, while heat transfer coefficient had the opposite result. Wicking effect increased slowly at the beginning and decreased sharply later. It was found that soft nursing care improved the drying efficiency.
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Wu, Danjie. "Impact of Green Total Factor Productivity in Marine Economy Based on Entropy Method." Polish Maritime Research 25, s3 (2018): 141–46. http://dx.doi.org/10.2478/pomr-2018-0123.
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Abstract In order to improve the efficiency of marine economic production and realize the sustainable and healthy development of marine economy, the spatial-temporal and dynamic evolution trend of marine economic green production efficiency in coastal areas of China is analysed by means of SFA basic model, coefficient of variation, coefficient of Gini and entropy method. It mainly includes three aspects: the result analysis of marine economy green production efficiency; the dynamic trend analysis of marine economy green production efficiency; the analysis of factors affecting marine economy green production efficiency. The results show that the factors affecting the total factor productivity of the marine economy are: development level of marine economy, marine material capital, level of opening to the outside world, marine industrial structure, marine human capital and marine environmental governance.
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Masunda, Shylet, and Ireen Choga. "Impact of trade liberalization on technical efficiency of mining sector: A case of selected SADC countries." Problems and Perspectives in Management 19, no. 4 (2021): 362–74. http://dx.doi.org/10.21511/ppm.19(4).2021.29.
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Productive inefficiency and lagging technology progress are major reasons behind the Southern Africa Development Community’s (SADC) continued exportation of unprocessed minerals to the world markets. The study seeks to uncover the impact of trade openness on the technical efficiency of the mining sector in selected SADC countries (Botswana, DRC, Namibia, South Africa, Zambia, and Zimbabwe). Technical efficiency is the ability of any production process to produce maximum output from minimum quantities of inputs. A Cobb Douglas Stochastic Frontier Approach in a single-stage maximum likelihood estimation of Green’s true fixed effects was used to compute technical efficiency (scores) and the technological progress in the mining sector of SADC. Results indicate that there is no technical efficiency gains from trade liberalization during the period under study together with positive and significant technological progress. A coefficient of 0.72 suggests that a 1% increase in trade openness increases technical inefficiency in the mining sector by 0.72%. The parameter coefficient from the truncated normal distribution of the true fixed effects model indicated that technological progress from one year to the next year would lead to a 2.6% increase in the output index of the mining. Technological progress in the mining sector should target upstream mineral value chains instead of only upgrading technology in one dimension of extraction. In addition, countries should collectively and gradually put across laws that force new investments in the extraction of minerals to erect processing plants in mining value addition of host countries to re-direct economies into a growth path. AcknowledgmentsThe authors are grateful to the North West University (RSA) for financing this study. &amp;nbsp;
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Samiilenko, Sergii, Vоlоdymyr Bondar, Volodymyr Piddubnyi, Olena Bilyk, Vitaliy Shutyuk, and Viktor Fedoriv. "Thermodynamic analysis of the thermal-technological complex of sugar production: criteria for energy efficiency of an enterprise." Eastern-European Journal of Enterprise Technologies 3, no. 8(111) (2021): 6–13. http://dx.doi.org/10.15587/1729-4061.2021.235081.
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A procedure for analyzing the effectiveness of using fuel and energy resources (FER) in sugar production, based on the developed idealized circuit of the thermal-technological complex (TTC) as the base for comparison was presented. This procedure makes it possible to quantify the level of perfection of existing and proposed thermal circuits, as well as the impact of measures for enhancing energy efficiency on their perfection. By idealizing technological and energy processes, a hypothetical TTC was synthesized, for which the minimum possible energy and entropy characteristics are determined. Under these conditions, the minimum possible heat consumption for the implementation of technological processes according to the classical heat technology circuit was calculated – 118.40 MJ/t; a "minimum" total increase in entropy from irreversible processes of the HTC – 314.68 kJ/(t·K); a minimum complex magnitude of specific consumption of conventional fuel – 0.8 % to m. b. The determined characteristics are absolute criteria for the efficiency of sugar production systems, since it is impossible to reach lower values under existing technology, quality of raw materials and other conditions. The content of the criteria of energy efficiency of TTC was stated and the system of coefficients was proposed: coefficient of total energy efficiency of the TTC, coefficient of energy efficiency of the system of heat supply of the technological processes and coefficients of energy efficiency of internal and external structures of the TTC. The proposed criteria provide an objective and thermodynamically correct characteristic of the TTC of different structures. The presented results of analysis of various measures for increasing the energy efficiency of sugar production show that only a gradual comprehensive reconstruction of an enterprise makes it possible to consistently reduce the FER consumption for technological needs, approaching the boundary values.
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Ribeiro Ramos, O. O. "Accounting and Informational Evaluation of the Financial and Economic Efficiency of Agricultural Enterprises Environmental Management." Management of Economy: Theory and Practice. Chumachenko’s Annals, no. 2020 (2020): 204–15. http://dx.doi.org/10.37405/2221-1187.2020.204-215.
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The article summarizes the accounting and informational evaluation of the financial and economic efficiency of agricultural enterprises environmental management. There is a tendency to reduce the use of pesticides in agro-industrial production, which indicates the desire of producers to produce organic products with a minimum amount of chemicals. The national trend of introduction of waste-free or low-waste production is analyzed. A set of indicators for assessing the effectiveness of the environmental management system of agricultural enterprises based on indicators of impact on the environment and biota (allows to determine the depth of environmental impact from the activities of agricultural enterprises), indicators of attracting production potential of the enterprise for greening between the consumed and reproduced resource of the enterprise) and nature conservation and indicators of financial costs for nature conservation (determine the amount of costs incurred by the agricultural enterprise for the preservation of the environment and biota). To assess the effectiveness of the environmental management system of agricultural enterprises, it is proposed to determine its comprehensive indicator according to these three components. The ranking scale of the complex indicator is developed and its dependence on the coefficient of emissions of hazardous substances into the air by the agricultural enterprise is determined; the coefficient of wastewater emissions into the environment by an agricultural enterprise; the coefficient of waste-free production by an agricultural enterprise; the coefficient of impact on the environment due to accidents at the enterprise; the coefficient of costs for the protection of the natural environment and biota; coefficient of investments involved in the protection of the natural environment and biota; current liquidity ratio; the coefficient of renewal of obsolete fixed assets for environmentally friendly; depreciation ratio; depreciation ratio of fixed assets; coefficient of environmental friendliness of production processes. A ranking scale for each of the components of the integrated indicator is proposed. The prospect of further research is determined, which is based on the need to test the evaluation of the effectiveness of the environmental management system on the proposed indicators on the example of agricultural enterprises of Ukraine.
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Fallon, Corey K., Leslie M. Blaha, Brett Jefferson, and Lyndsey Franklin. "A Capacity Coefficient Method for Characterizing the Impacts of Automation Transparency on Workload Efficiency." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 63, no. 1 (2019): 827–32. http://dx.doi.org/10.1177/1071181319631436.
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Automation can be unreliable. This makes appropriate trust and reliance difficult to calibrate. One solution to building appropriate trust is to increase automation transparency by displaying information to the operator about the technology’s underlying analytical principles. However, displaying this additional information may increase operator workload. The research and development community must balance the competing demands of providing adequate transparency and keeping operator workload low. To investigate the complex effects of transparency on workload, a modeling approach can be used by computing a measure of processing efficiency called the capacity coefficient. We conducted a study to examine the impact of increasing transparency on operator workload using the capacity coefficient. We present the data from one participant with the goal of demonstrating the utility of the capacity coefficient. We discuss how this participant’s data highlights the inferences possible from capacity analysis for measuring the impact of display design and increased transparency on operator workload.
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Fu, Cui Li, and Yong Ping Xie. "Study on Energy Consumption Evaluation for Public Buildings Based on AHP-FCE Model with Dynamic Weight." Applied Mechanics and Materials 71-78 (July 2011): 543–46. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.543.
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This paper proposes AHP-FCE model with dynamic weight for the operational phase of school public building, to determine the energy saving coefficient of unit Office, and then evaluate energy efficiency of the whole building during running period. Paper introduces the concept of degree of weight effect, to quantify the impact of factors on the overall evaluation result, explains the idea of energy saving coefficient, to measure the building energy efficiency. Based on degree of weight effect, we get weight adjustment vectors to calculate energy saving coefficient. Through the energy monitoring system based on Green IT, paper shows that the proposed model can reflect the energy efficiency accurately and in time, rather than simply reflect how much energy is consumed.
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Costa, Vânia, Lurdes Silva, and Loureiro Paula. "Intellectual capital and its impact on business performance: An empirical study of Portuguese hospitality and tourism sector." Intangible Capital 16, no. 2 (2020): 78. http://dx.doi.org/10.3926/ic.1550.
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Purpose: The propose of this study is to determine the influence of Intellectual Capital (IC) and its components’ impact on Portuguese tourism organizations’ business performance through Return on the assets (ROA). This work evaluate and compare the intellectual capital in its four dimensions: (i) capital employed; (ii) human capital; (iii) structural capital and (iv) relational capital. Design/methodology/approach: To approach the aim of the study the method Value Added Intellectual Coefficient (VAICTM) was applied and the practical data were collected from the Simplified Business Information (IES) through SABI (Iberian Balance Sheet Analysis System) database. The economic and financial information was collected from balance sheets and financial reports of 46.951 Portuguese companies in the hospitality and tourism sector during 2016. Multiple regression analysis was employed to identify the effect of IC components’ that significantly contribute to the company performance.Findings: The paper reveals that VAICTM, human capital efficiency coefficient (HCE), capital employed efficiency coefficient (CEE).and ROA are positively related among Portuguese’s hospitality and tourism sector. However, the structural capital efficiency coefficient (SCE) presents a negative association with profitability and the results of the relationship between the variable relational efficiency coefficient (RCE) and ROA do not present statistical significance.Practical implications: The application of the VAICTM model presented in this paper provides a basis for practical application for management.Originality/value: The paper represents a pioneering attempt to understand the relationship of intellectual capital and firm’s profitability on Portuguese hospitality and tourism sector’s, to provide solid recommendations for the importance of intellectual capital in the sustainable growth of organizations in this sector.
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Wang, Xuewen, Bo Li, Shaowei Wang, Zhaojian Yang, and Liu Cai. "The transporting efficiency and mechanical behavior analysis of scraper conveyor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 18 (2017): 3315–24. http://dx.doi.org/10.1177/0954406217734002.
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Scraper conveyor is the main equipment for underground coal transportation, and its high-efficiency and smooth operation is of great significance to safety production. This study simulated the process of transporting bulk coal by the scraper conveyor using the discrete element method. Transporting efficiency of scraper conveyor affected by the chain speed, static frictional coefficient, particle size, and laying angle was studied. Then the relationship between the chain speed, static frictional coefficient and the chute wear was explored. The stress and deformation characteristics of the chute during the transportation were studied by coupling the discrete element method and finite element method. Results showed that the mass flow rate changed significantly with the chain speed and static frictional coefficient, while it varied slightly with the change of particle size and laying angle; the higher chain speed and larger bulk coal led to more serious wear of the chute, and large stress mainly concentrated at the direct contact area and the area under the impact load from the bulk coal. Therefore, when designing the chute structure, it is necessary to ensure the wear resistance and strength of the contact area on the chute. The results could provide a theoretical basis for structural optimization of scraper conveyor.
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Dumanska, Ilona. "QUALITY ASSESSMENT OF BUSINESS STRATEGY IN INTERNATIONAL TRADE: INDICATORS AND PARAMETERS." Baltic Journal of Economic Studies 7, no. 2 (2021): 57–64. http://dx.doi.org/10.30525/2256-0742/2021-7-2-57-64.
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The purpose of the paper is to develop a system of indicators and parameters for assessing the quality of business strategy in international trade based on analysis of the effectiveness of export-import operations, which are evaluated and analysed by managers in developing and implementing business strategies for effective management decisions to expand foreign markets. Methodology. There were used general scientific and special research methods. Assessing the quality of the company’s business strategy in international trade when planning to enter or expand foreign markets was based on economic comparative analysis and grouping, synthesis and formalization. Using the method of coefficients, structural analysis and analytical comparison, groups of indicators are proposed for analysis and evaluation of the effectiveness of business strategy in export and import operations. Economic and mathematical modelling, scientific abstraction, systems analysis contributed to the development of economic parameters for assessing the quality of business strategy in international trade. Results. It is established that the assessment of the quality of the business strategy of the enterprise in international trade should be calculated not only taking into account absolute, relative, structural indicators, but also efficiency indicators. Groups of indicators for analysis and evaluation of the effectiveness of export and import operations that can be used in management activities are proposed. To determine the quality of business strategy in international trade, the feasibility of using the main block of efficiency indicators such as: direct effect of exports/imports, comparative effect of exports/imports, the level of efficiency of exports/imports, and supplementing the block of indicators characterizing economic efficiency (end result) of the business strategy in international trade. An individual approach to the formation of each enterprise’s own system of economic parameters for assessing the quality of business strategy in international trade, taking into account such basic parameters as assessing the scope of achieving business strategy goals, the importance of information data on business strategy assessment, timing of business assessment - strategies, technical and methodological level of evaluation, novelty of the received information for adjustment of business strategy. Practical implications. Formation of a methodological approach to the assessment of such qualitative characteristics of business strategy in international trade as efficiency and effectiveness, determination of basic economic parameters of its evaluation system. Value / originality. The proposed groups of indicators and parameters for assessing the quality of business strategy in international trade can be used in management to confirm the effectiveness of strategic directions of business development and to counteract the making of intuitive decisions by top management in this area.
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Kharati-Koopaee, Masoud, and Hossein Moallemi. "Effect of blade tip grooving on the performance of an axial fan at different tip clearances in the absence and presence of inlet guide vanes." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 1 (2019): 72–84. http://dx.doi.org/10.1177/0957650919850423.
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This research aims at the numerical study of the blade tip grooving effect on the performance of a ducted axial fan at different tip clearances in the absence and presence of inlet guide vanes. To do this, significant parameters of the fan (i.e. pressure and torque coefficients as well as fan efficiency) comprising single- and double-grooved tips are evaluated and compared with those of the original fan. Validation of the considered numerical model is performed through comparison of the numerical findings with experimental results of a single-stage ducted fan, which comprises a set of 37 guide vane and 24-blade rotor rotating at the speed of 3600 r/min. Results reveal that grooving the blade tip causes the fan parameters to increase and higher fan parameters could be attained adopting single-grooved tip. It is shown that employing grooved blades causes the sensitivity of fan parameters to the change in the tip clearance to diminish. Results exhibit that the impact of grooving the blade on the reduction of sensitivity of fan parameters to the change in the tip clearance for the single-grooved tip in the absence of guide vanes is more remarkable than the other cases and in this case, as the tip clearance increases from the lower to the upper considered value, the decreased percentages in pressure coefficient, torque coefficient, and fan efficiency are 29.8%, 8.9%, and 22.8%, respectively. Numerical findings show that the influence of grooving the blade on the fan parameters in the presence of guide vanes is lower than that without guide vanes and in the presence of guide vanes, the highest average increase percentages in pressure coefficient, torque coefficient, and fan efficiency relative to those of the original fan, which is observed in the single grooved tip, are 3.1%, 1.4%, and 1.7%, respectively.
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Hengzhou, X., and C. Tong. "Impact of farmers’ differentiation on farmland-use efficiency: Evidence from household survey data in rural China." Agricultural Economics (Zemědělská ekonomika) 59, No. 5 (2013): 227–34. http://dx.doi.org/10.17221/124/2012-agricecon.
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Farmer differentiation has important implications for the efficiency of farmland use. Applying the model of DEA and Tobit, using the household survey data, this paper investigates the effects of the farmer stratum differentiation on the efficiency of farmland use. The empirical results showed that the type of farmer differentiation was positive and statistically significant at 5% level. The regression coefficient is 0.295; this result implies that if this variable improves one percentage, the efficiency of farmland use will increase by 29.5%. The farmer horizontal differentiation and farmer vertical differentiation pass the significance test at the 1% and 5% level, respectively. This indicates that they all have a significant positive impact on the farmland use efficiency. We conclude that corresponding measures should be implemented to further facilitate the farmer differentiation. Another implication of our results is that the policies matched with the farmer differentiation and transfer should be gradually perfected, and then they will provide a better environment of the society and economy for free migration of farmers. &nbsp;
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Li, Bin, Mingfang Zhou, and Yameng Bai. "The relationships and trends of interregional virtual water trade based on an MRIO model." Water Supply 22, no. 3 (2021): 2395–406. http://dx.doi.org/10.2166/ws.2021.361.
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Abstract To consider the problem of uneven distribution of water resources, a study on the relationship and trend of virtual water trade between regions based on an Multi-Regional Input-Output (MRIO) model was proposed. Using an MRIO model, the spatial distribution and changing trends of China's inter-regional virtual water trade from 2014 to 2019 were evaluated. The empirical results show that, due to the difference in water use efficiency and production processes in different sectors, the direct and indirect water use coefficients and demand coefficients are different in different regions. In some water-poor areas (regions with low water availability), more products with high water use coefficients are exported, while more water-rich areas (regions with high water availability) export products with lower water use coefficients. The inter-regional virtual water trade only alleviates the shortage of water resources in some poor water areas in China. Some poor water areas export a large amount of virtual water, and the rich water areas import a large amount of virtual water or only maintain a partial virtual water balance. However, the demand coefficient tends to increase, and the trade adjustment trends in different regions and changes in regional virtual water trade relations are not conducive to alleviating the shortage of water resources caused by uneven distribution. The tension coefficients between the food manufacturing and tobacco processing industry, the textile and clothing industry, and the wood processing and furniture manufacturing industries in the Northeast region are relatively large, with the demand coefficients are 92.9, 65.5 and 156.7 respectively. Relatively speaking, the tensile coefficients of areas rich in natural water resources such as the eastern coastal, southern coastal, southwest, and central areas are generally low. According to the production situation, the regional virtual water trade relationship should be adjusted from the level of the national master plan.
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Ivanek, Vladimir, Branko Đukić, Branimir Mikić, Miroslav Smajic, and Dragan Doder. "EFFECTS OF TECHNICAL AND TACTICAL CHARACTERISTICS ON THE PERFORMANCE OF THE TABLE TENNIS PLAYERS." Facta Universitatis, Series: Physical Education and Sport 16, no. 1 (2018): 157. http://dx.doi.org/10.22190/fupes180507014i.
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The aim of the research was to determine the effects of applied technical and tactical characteristics of table tennis players on their success in competitions. The representative sample consisted of 48 top senior table tennis players from Bosnia and Herzegovina, age 18 and 36, selected on the basis of a qualification tournament. The measuring instruments for this study included eight assessment tests for the table tennis players' technical and tactical characteristics and one test for assessing success in table tennis competitions. Technical and tactical characteristics of the participants were evaluated by five experts who analyzed the efficacy of technical and tactical characteristics of the players on a scale ranging from 1 to 5. The methods of processing the results included descriptive statistical procedures, the multiple correlation coefficient, the determinant coefficient and a multiple regression analysis. The results indicate that technical and tactical characteristics have a major impact on the player's performance and are essential for table tennis success. Based on the value of the regression coefficients and their significance, it may be concluded that the 5 variables statistically significantly contribute to the regression model are: the efficiency of the serve; the efficiency of preventing the attack of the opponent and preparation of the players’ own attack; confidence when attacking across the table; the efficiency in the active defence and the efficiency of movement during the game. In the hierarchy of significance, the most important variables are the serve efficiency and efficiency of preventing the attack of an opponent and preparation of the player's own attack. The efficiency of the serve allows an attacker to realize technical and tactical ideas and usually gain initiative in the game. By returning a serve we can prevent or at least make it harder for the opponent to attack again. A serve return can also allow us to take the initiative
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Fedosov, Sergey V., Vadim N. Fedoseev, and Ludmila A. Oparina. "The Issues of Energy Efficiency of Buildings for Agricultural Purposes." Materials Science Forum 931 (September 2018): 436–42. http://dx.doi.org/10.4028/www.scientific.net/msf.931.436.
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The current problem of ensuring energy saving and improving the energy efficiency of buildings and structures for agricultural purposes is identified. The geopolitical situation, import substitution programs and agricultural development programs set the task of developing domestic vegetable production, which in its turn requires the construction of new vegetable store buildings, as in most regions of Russia the harvest is collected once a year. In this regard, the current task is to ensure the energy conservation and achieve high energy efficiency of the vegetable store buildings. Energy saving is the basic technology for creating effective agriculture. The purpose of the study is to analyse the requirements for insulation materials for buildings and vegetable store facilities, taking into account energy efficiency and life cycle cost. The authors analysed the criteria for choosing a heater for the vegetable stores: low coefficient of thermal conductivity, water absorption, sorption humidity, frost resistance, biostability, lack of cold bridges, long service life. It is proposed to supplement the criteria for choosing a building insulation with the characteristics of the life cycle cost and the service life. Design and construction of agricultural buildings is proposed to be implemented using the concepts of BLC and BIM, the use of which gives an opportunity to design buildings with optimal energy efficiency parameters and take into account the cost of the life cycle. The cost of the buildings life cycle is the main of all the performance indicators when comparing alternative design options that differ by the application of advanced technologies and material resources and the contractors' offers when concluding contracts not only for purchase, but for servicing the subject of trades during its service life. The conclusions are made about the advantages of using foamed polyethylene foam for warming vegetable store buildings, as well as the conclusion about the expediency of adding criteria determining the sustainable development of the human environment, namely life cycle cost, service life, recycling ability. The formula for calculating the cost of the buildings life cycle, adapted to the specificity of buildings for agricultural purposes, is given.
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Barbarić, Marina, and Zvonimir Guzović. "Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines." Energies 13, no. 17 (2020): 4560. http://dx.doi.org/10.3390/en13174560.
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Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.
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Rahman, Md Jahidur, and Siyan Ding. "Measuring intellectual capital efficiency: A case of football clubs in the UEFA Champion League." Corporate Governance and Organizational Behavior Review 4, no. 1 (2020): 30–40. http://dx.doi.org/10.22495/cgobrv4i1p3.
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The purpose of this study is to examine the intellectual capital efficiency of football clubs in the UEFA Champion League between 2010 and 2019. We measure the intellectual capital efficiency of each football club through Value Added Intellectual Coefficient (VAIC) method developed by Pulic (1998, 2004), Ghosh and Mondal (2009), Yalama (2013), Ozkan, Cakan, and Kayacan (2017). Using a sample of 10 football clubs from 7 countries, we find that almost all clubs use their intellectual capital efficiently with great coefficients. We also document that human capital, as the core of intellectual capital, has a positive impact on structural capital. Our finding is significant for sports managers to make strategic management of intellectual sources to create value in the football industry. It suggests that football clubs should pay more attention to intellectual capital like fan loyalty and talented players. Meanwhile, it helps the sports industry to play a great role of human capital in intellectual capital and to increase the competitive advantage of the enterprise.
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Li, Yelin. "Research on the Matching of Impact Performance and Collision Coefficient of Hydraulic Rock Drill." Shock and Vibration 2021 (March 6, 2021): 1–13. http://dx.doi.org/10.1155/2021/6651860.
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The stress wave produced by the piston impact, on the drill rod, is an important factor affecting impact performance. It is particularly important to control the stress waveform generated by the piston impact on the drill rod to meet the requirements of efficiency and component durability of some impact mechanical systems. Based on wave theory, the impact stress wave model of rock drilling is established, a dimensionless collision coefficient γ is put forward, and the matching relationship between different collision coefficients γ and stress waveforms is analysed. The length of the impact piston under the same material condition determines the change rule of the waveform. The stress waveform experimental verification is thus designed. The pressure chamber curves of different pistons in the rock drill were tested, the collision velocity of the piston was obtained, and the impact energy and impact power were calculated. The relationship between the impact performance and the collision coefficient γ is analysed. When γ is in the range of 9–11, the impact piston’s design of a high-power rock drill can be satisfied. When γ is in the range of 3∼5, it is mainly designed for low-power rock drills.
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Sleziak, P., J. Szolgay, K. Hlavčová, and J. Parajka. "The Impact of the Variability of Precipitation and Temperatures on the Efficiency of a Conceptual Rainfall-Runoff Model." Slovak Journal of Civil Engineering 24, no. 4 (2016): 1–7. http://dx.doi.org/10.1515/sjce-2016-0016.
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AbstractThe main objective of the paper is to understand how the model’s efficiency and the selected climatic indicators are related. The hydrological model applied in this study is a conceptual rainfall-runoff model (the TUW model), which was developed at the Vienna University of Technology. This model was calibrated over three different periods between 1981-2010 in three groups of Austrian catchments (snow, runoff, and soil catchments), which represent a wide range of the hydroclimatic conditions of Austria. The model’s calibration was performed using a differential evolution algorithm (Deoptim). As an objective function, we used a combination of the Nash-Sutcliffe coefficient (NSE) and the logarithmic Nash-Sutcliffe coefficient (logNSE). The model’s efficiency was evaluated by Volume error (VE). Subsequently, we evaluated the relationship between the model’s efficiency (VE) and changes in the climatic indicators (precipitation ΔP, air temperature ΔT). The implications of findings are discussed in the conclusion.
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Chugai, Angelina, Anastasiia Нlod, and Victor Pylypiuk. "State and quality of water in the Desna river basin (within the Chernigiv region)." Environmental Problems 6, no. 4 (2021): 226–32. http://dx.doi.org/10.23939/ep2021.04.226.
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The Desna River is a tributary of the Dnieper with a total length of 575 km within Ukraine. 468 km of them flows through the Chernihiv region. The main pollution sources of the water bodies in the Chernihiv region are utilities. Continuous monitoring of the surface water state is relevant and necessary, as it allows to give a reliable water quality assessment, to identify the anthropogenic impact factors and to assess the technogenic loading in order to establish the level of water use and to develop a set of measures to improve the state of water and the environment in general. The materials of monitoring observations of the water quality indicators of the Desna river for a long-term period, as well as the materials of the Ecological passports of the Chernihiv region concerning the water use indicators, were used as the initial data in the work. The analysis of the hydrochemical regime of the Desna River over a long period was performed using a graphical method. The assessment of the technogenic impact on the water bodies of the region was performed using the method of assessing the efficiency of water use based on the water consumption and sewerage efficiency coefficients. The analysis of the content of the water quality indicators showed that constant exceedance of the MPC (Maximum Permissible Concentrations) in the waters of the Desna River within the Chernihiv region was observed in the content of phosphates and nitrites, as well as total iron and manganese. The results of the assessment of the technogenic impact on the water basin of the Desna River showed that the drainage coefficient underwent certain changes with the best indicators in 2015–2016. No sharp fluctuations in the values of the water supply coefficient were observed. The best values of the water use efficiency complex coefficient were noted in 2015–2016. In general, in recent years the efficiency of water using indicators of the Desna River water in the Chernihiv region has corresponded to the average indicators. The results of the assessment of the technogenic impact on all components of the environment in the Chernihiv region showed that in recent years there has been a tendency to reduce the technogenic impact complex indicator. In general, the Chernihiv region can be attributed to the second ecological district with a moderate technogenic loading level.
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Roy, Ivan V. "Underwater observations on fish behavior to determine the coefficient of catchability for Danish seine." Izvestiya TINRO 187, no. 4 (2016): 233–44. http://dx.doi.org/10.26428/1606-9919-2016-187-233-244.
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Underwater observations were conducted to assess the impact of the research Danish seine elements on behavior of walleye pollock Theragra chalcogramma in its active zone. The underwater video equipment was installed on specially designed and constructed experimental platform and on elements of the Danish seine. In the experiment with pollock, the experimental platform demonstrated its low efficiency, however, it could be used for observations on sedentary benthic organisms on homogeneous soils without sharp changes in the terrain. With the equipment installed directly on the Danish seine, high efficiency of the seine ropes was observed: up to 92 % of fish from encircled volume remained in the towed area. Taking into account this estimation and features of fish biomass distribution, the coefficient of catchability for Danish seine is determined as 0.40 ± 0.15.
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Segel, Sally, Jason Hashima, William Thomas Gregory, Alison Edelman, Hong Li, and Jeanne-Marie Guise. "A New Approach to Postpartum Rounds: Patient-Centered Collaborative Care Improves Efficiency." Journal of Graduate Medical Education 2, no. 1 (2010): 67–72. http://dx.doi.org/10.4300/jgme-d-09-00060.1.
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Abstract Objective At our institution, traditional postpartum rounds were time consuming and inefficient with a low percentage (approximately 12%) of patients meeting the goal of being discharged by 11:00 am. A patient-centered collaborative care (PCCC) initiative was implemented to improve discharge efficiency, staff communication, and patient satisfaction. We investigated whether this paradigm shift to PCCC could improve clinical inefficiencies and timely discharge. Methods The PCCC rounding system was created by a representative group of physicians, residents, nurses, case managers, and social workers. An intervention study was conducted to examine the impact of PCCC during which physicians, residents, medical students, nurses, case managers, and social workers made rounds together. Efficiency data were collected for patients whose infants were delivered by the obstetric service for a 1-month period before and 6 months after implementing PCCC. Comparisons were made on the time of discharge and whether Foley catheter removal affected discharge time. χ2 test, Wilcoxon 2-sample test, and Pearson correlation coefficient were used where appropriate. Results Three hundred five patients were included in this analysis, of which 156 participated in traditional postpartum rounds and 149 in PCCC rounds. Discharge efficiency significantly improved with PCCC rounds, with 20.8% of patients being discharged by 11:00 am as compared to 11.5% for traditional postpartum rounds (P = .03). Early Foley catheter removal was significantly associated with time to discharge order (Pearson correlation coefficient, 0.22; P = .01) and discharge time (Pearson correlation coefficient, 0.28; P = .002). Conclusions Patient-centered collaborative care rounds improve the efficiency of postpartum care and discharge time.
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Kaluva, Sai Teja, Aditya Pathak, and Aybike Ongel. "Aerodynamic Drag Analysis of Autonomous Electric Vehicle Platoons." Energies 13, no. 15 (2020): 4028. http://dx.doi.org/10.3390/en13154028.
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Vehicle platooning has been proposed as one of the potential technologies for intelligent transport systems to improve transportation and energy efficiency in urban cities. Despite extensive studies conducted on the platooning of heavy-duty trucks, literature on the analysis of urban vehicle platoons has been limited. To analyse the impact of platooning in urban environments, this paper studies the influence of intervehicle distance, platoon size and vehicle speed on the drag coefficient of the vehicles in a platoon using computational fluid dynamics (CFD). Two vehicle models—a minibus and a passenger car—are analysed to characterise the drag coefficients of the respective platoons. An analysis of energy consumption is conducted to evaluate the energy savings with platooning using a longitudinal dynamics simulation. The results showed a reduction in the average drag coefficient of the platoon of up to 24% at an intervehicle distance of 1 m depending on the number of vehicles in the platoon. With a larger intervehicle distance of 4 m, the reduction in the drag coefficient decreased to 4% of the drag coefficient of the isolated vehicle. Subsequently, energy savings with platooning were calculated to be up to 10% depending on the driving cycle, intervehicle distance and platoon size.
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Wan Mohamed, Wan Mazlina, Nirresh Prabu Ravindran, and Parvathy Rajendran. "A CFD Simulation on the Performance of Slotted Propeller Design for Various Airfoil Configurations." CFD Letters 13, no. 3 (2021): 43–57. http://dx.doi.org/10.37934/cfdl.13.3.4357.
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The usage of slots has gained renewed interest in aerospace, particularly on propeller design. Most of the works have focused on improving the aerodynamic performance and efficiency. Modern research on propeller design aims to design propellers with high thrust performance under low torque conditions without any weight penalty. Although research on slotted design has been done before, none has been done to understand its impact on different airfoils on the propeller blade. Thus, this study aims to provide extensive research on slotted propeller design with various airfoil of different properties such as high Reynolds number, low Reynolds number, symmetrical, asymmetrical high lift, and low drag. This work has been investigated using computational fluid dynamics method to predict propeller performance for a small-scale propeller. The slotted blade designs' performance is presented in terms of thrust coefficient, power coefficient, efficiency, and thrust to power ratio. Here, the slotted APC Slow Flyer propeller blade's performance has been investigated for diverse types of airfoils with the shape and position of the slot is fixed which is a square-shaped at 62.5% of the chord length. The flow simulations are performed through three-dimensional computational fluid dynamic software (ANSYS Fluent) to determine the thrust coefficient, power coefficient, efficiency, and thrust to power ratio measured in advancing flow conditions. Findings show that the slotted propeller design composed of symmetrical, high Reynolds number, high lift airfoils can benefit the most with slots' implementation. These improvements were 19.49%, 69.13%, 53.57% and 111.06% in terms of thrust, power, efficiency and trust to power ratio respectively.
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Fu, Yao, and Tian Heng Zhang. "Energy Efficiency Design Strategy of Commercial Building in Northeast Cold Regions." Applied Mechanics and Materials 174-177 (May 2012): 2165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.2165.
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From the point of view of architectural design, envelope location, selection, and identify programs of envelope structure in the modern commercial building, give priority to the establishment of image of shopping malls , creating the mood of commercial and other factors. The paper will establish the appropriate model to the impact of the shape coefficient of Commercial building energy consumption in cold regions, validity analysis used the building energy evaluation software named Autodesk Ecotect to provide adequate theoretical basis of energy conservation design strategies.
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Zhao, Liangyu, and Shuxing Yang. "Influence of Thickness Variation on the Flapping Performance of Symmetric NACA Airfoils in Plunging Motion." Mathematical Problems in Engineering 2010 (2010): 1–19. http://dx.doi.org/10.1155/2010/675462.
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In order to investigate the impact of airfoil thickness on flapping performance, the unsteady flow fields of a family of airfoils from an NACA0002 airfoil to an NACA0020 airfoil in a pure plunging motion and a series of altered NACA0012 airfoils in a pure plunging motion were simulated using computational fluid dynamics techniques. The “class function/shape function transformation“ parametric method was employed to decide the coordinates of these altered NACA0012 airfoils. Under specified plunging kinematics, it is observed that the increase of an airfoil thickness can reduce the leading edge vortex (LEV) in strength and delay the LEV shedding. The increase of the maximum thickness can enhance the time-averaged thrust coefficient and the propulsive efficiency without lift reduction. As the maximum thickness location moves towards the leading edge, the airfoil obtains a larger time-averaged thrust coefficient and a higher propulsive efficiency without changing the lift coefficient.
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Gong, Changchao, Minghui Hu, Shuxian Li, Sen Zhan, and Datong Qin. "Equivalent consumption minimization strategy of hybrid electric vehicle considering the impact of driving style." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 10 (2018): 2610–23. http://dx.doi.org/10.1177/0954407018803768.
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The impact of driving style on the fuel economy is normally unconsidered in the development process of the equivalent consumption minimization strategy for hybrid electric vehicles. This article established a real vehicle energy management strategy based on the combination of driving style recognition and optimized equivalent consumption minimization strategy. In detail, the driving style recognition algorithm is obtained by introducing the driving style identification coefficient containing driving condition type influence factor and combining the coefficient with the genetic optimization K-means driving condition recognition algorithm. The equivalent consumption minimization strategy is optimized by genetic algorithm to optimize the battery SOC penalty function and charge–discharge coefficient. Comparing the proposed energy management strategy with the traditional equivalent consumption minimization strategy in a stochastic driving condition, the simulated result shows that the fuel consumption rate is reduced by 8.49% by making the operating points of the engine closer to the engine best efficiency curve, and making battery SOC changes more smooth and maintaining it in a reasonable area. It means that the proposed energy management strategy achieves higher fuel computation efficiency and better power distribution between the integrated starter generator and the engine.
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Bhasin, Niti, and Shilpa Garg. "Impact of Institutional Environment on Inward FDI: A Case of Select Emerging Market Economies." Global Business Review 21, no. 5 (2019): 1279–301. http://dx.doi.org/10.1177/0972150919856989.
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The tremendous amount of foreign direct investment (FDI) flowing into emerging nations has attracted worldwide attention. These economies are at a same stage of development with similar social, economic and other conditions, but their institutional environment can act as a differentiator in affecting FDI location within these emerging economies. So, this article examines the role of institutional mechanisms in influencing their inward FDI by employing broad-based indicators of institutional environment. The article employs panel data regression (fixed effects) to test the impact of institutional indicators and other variables on FDI inflows and stock of 23 emerging economies from 2006 to 2015. Three indices have been constructed for this purpose, using the methodology of principal component analysis and composite index, from 24 institutional variables. All the three indices, representing three institutional pillars turned significant: ‘Rule of law’ (negative coefficient), ‘Regulatory efficiency’ (positive coefficient) and ‘normative institutional environment’ (negative coefficient). This implies that one of the main motivations for foreign investors to make investment in emerging economies is to take advantage of their weak laws, norms and values. But they also seek a basic enabling environment with minimum burdens as far as the efficiency of regulations is concerned.
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Rashid, MA, and MA Matin. "The policy analysis matrix of pulse crops production in Bangladesh." Bangladesh Journal of Agricultural Research 43, no. 1 (2018): 109–23. http://dx.doi.org/10.3329/bjar.v43i1.36185.
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This study examined the relative efficiency of producing of selected pulse crops in Bangladesh and their comparative advantage in international trade. To know the comparative advantage in production of selected pulse crops. The study have calculated net financial and economic profitability, nominal protection coefficient of output (NPCO), nominal protection coefficient of input (NPCI), effective protection co-efficient (EPC), private cost ratio (PCR), policy analysis matrix (PAM) and domestic resource cost (DRC). Data used in this study were collected through Household surveys from 300 sample farms located in 12 villages under 6 districts in Bangladesh for the period 2015 to 2016. The selected pulse crops i.e lentil, chickpea and mungbean cultivation at farm level is very much remunerative to its growers. The domestic-border price ratio of selected pulse crops indicates that domestic pulse production was taxed and consumers were subsidized. The border price of selected pulse crops at producer level was mostly higher than the domestic producer price indicating that there is a wide scope to cultivate pulse crops for import substitution in Bangladesh. Policy Analysis Matrix for selected pulse crops under import parity prices showed that revenue transfer (Tk -14,755/mt) was negative indicated that government policies affect negatively to the pulse producer. The input transfer (Tk -1108/mt) was also negative indicating that the government has implemented input subsidy policy to the crop sector to offset higher cost of production. The domestic factor transfer was positive (Tk 15,171/mt) indicating that opportunity costs of non-tradable inputs were lower than their market prices. Finally the net profit/net policy transfer (Tk -28,503/mt) was negative which means that, the producers earn less profit and cannot minimize loss under existing condition and vice-versa. This means that under free trade, producers could make more profit in contrast to the existing policy environment. The NPCO values less than one imply that policies do not provide nominal protection for the pulse producers. The findings based on the indicators of NPCO, NPCI, EPC and PCR conclude that the existing government policy environment tends to protect the interest of the pulse producers in agricultural sector at production level. DRC results indicated that Bangladesh had comparative advantage of producing pulse crops and production of pulse crops would be highly efficient for import substitution.Bangladesh J. Agril. Res. 43(1): 109-123, March 2018
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Hu, Xiang, and Guo Yong Huang. "The Application of Improved Efficiency Coefficient Method in Debris Flow Warning with Rock Technology in Civil Engineering." Applied Mechanics and Materials 454 (October 2013): 149–52. http://dx.doi.org/10.4028/www.scientific.net/amm.454.149.
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To solve the problem of inaccurate prediction of debris flow in dangerous rock technology, introducing combination weighting method to improve the accuracy. Calculate the weight of each impact factors by using improved AHP (analytical hierarchy process) and entropy method. Then use combination weighting method to put the two sets of weight into a new weight. Finally apply efficacy coefficient method quantitative assessment the risk of the debris flow. The instance results show: using Efficacy Coefficient method that combined the Combination Weighting method can reflect the actual situation of debris flows, and have better effect than using entropy method. And it provides an idea of the method on disaster prevention and mitigation and dangerous rock technology.
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Hnylytska, L., D. Melnychuk, S. Boguslavska, O. Pidvalna, and T. Chechetova-Terashvili. "SECURITY PRIORITIES IN ASSESSING THE EFFECTIVENESS OF DOMESTIC ENTERPRISES." Financial and credit activity: problems of theory and practice 2, no. 37 (2021): 374–85. http://dx.doi.org/10.18371/fcaptp.v2i37.230312.
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Abstract. The article establishes a causal relationship between economic security and efficiency of the enterprise and hypothesizes about the need to expand approaches to analytical evaluation of efficiency, taking into account the security priorities of the enterprise. It has been proved that in the present conditions, the effectiveness of the activities of domestic enterprises is characterized not only by achieving a positive value of the financial result (profit), but also by the ability to withstand modern economic challenges to ensure the continuity of statutory activities. Therefore, the purpose of the article was to develop a safe-oriented model for evaluating the effectiveness of the enterprise and forming scientifically based recommendations for use as its methodological basis indicators that characterize the level of economic security. The methodological basis of the safety-oriented model is a system of balanced economic indicators, which ensures the evaluation of the efficiency of the enterprise from the standpoint of systemic integrity and enables multi-vector analysis of efficiency with trend determination and highlighting the most significant factors that influence the change in profitof the enterprise.. Unlike the classic efficiency assessment model based on coefficient analysis, which provides for the calculation of generalizing efficiency coefficients without taking into account external factors of influence on the activities of the enterprise, the safe and indicative model is based on methodological approaches to the consistency of certain groups of financial and economic indicators that characterize the impact of threats to the internal and external environment of the enterprise’s functioning to change the basic level of efficiency. The safety-oriented model of performance assessment was tested in the activities of agro-industrial enterprises . 2) in the emergence of reserves for increasing efficiency by leveling the impact of threats to the internal and externalenvironment; 3) establishing subordination between indicators in determining the general (effective) indicators that characterize the achieved level of efficiency of the enterprise; 4) the implementation of dynamic and factor analysis of the efficiency of the enterprise. Keywords: economic security, efficiency of the enterprise, analytical evaluation of efficiency, balanced indicators system, factor analysis, trend (dynamic) analysis, efficiency coefficients. JEL Classification H55, H56, М40 Formulas: 0; fig.:1; tabl.: 2; bibl.: 34.
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Liu, Feng Chen, and Lei Geng. "The Variation Coefficient Method for Reliability Sensitivity Analysis of Cylindrical Helical Spring." Applied Mechanics and Materials 55-57 (May 2011): 285–90. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.285.
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For mechanical reliability design with more random variable parameters, if the parameters are queued with their impact on the sensitivity of mechanical reliability, which will be as random variables with relatively high impact, while low-impact will be determined variables, thus would simplify reliability analysis due to the random variable number reduced. With cylindrical helical spring as an example, applying the variation coefficient method, the reliability sensitivity calculation of shear stress and deformation is discussed, and the impact on the reliability of cylindrical helical spring by changing the random variables is also studied. Using the variation coefficient method we can obtain the reliability sensitivity of cylindrical helical spring quickly and accurately, which provides a theoretical basis for the reliability design of cylindrical helical spring, and has greatly improved the reliability analysis efficiency of cylindrical helical spring.
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Li, Da, Wei Gao, Xusheng Wu, Jianxin Gao, and Shenqin Yang. "Research on the Impact of Marine Environment on ICPT Transmission Efficiency." International Journal of Antennas and Propagation 2020 (October 30, 2020): 1–14. http://dx.doi.org/10.1155/2020/5781806.
Full textAbstract:
ICPT is one of the most influential solutions in the field of wireless power transmission, but it is also very susceptible to the working environment. The complicated marine environment has a great influence on the performance of ICPT. In the deep-sea high-pressure environment, due to the piezomagnetic effect, the magnetic core in the coupling structure will suddenly change the permeability, and the coupling coefficient, self-inductance, and other parameters will also change accordingly. At the same time, changes in ocean currents in the ocean will cause the ICPT coils to be misaligned, thereby affecting the magnetic field distribution between the coils and the transmission efficiency of the system. In order to provide theoretical support for optimum design of ICPT system in ocean environment, the influence of core performance changes and ICPT coil misalignment on system transmission efficiency is studied.
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Veselinova, A., M. Agúndez, J. R. Goicoechea, et al. "Quantum study of reaction O (3P) + H2 (v,j) → OH + H: OH formation in strongly UV-irradiated gas." Astronomy & Astrophysics 648 (April 2021): A76. http://dx.doi.org/10.1051/0004-6361/202140428.
Full textAbstract:
The reaction between atomic oxygen and molecular hydrogen is an important one in astrochemistry as it regulates the abundance of the hydroxyl radical and serves to open the chemistry of oxygen in diverse astronomical environments. However, the existence of a high activation barrier in the reaction with ground-state oxygen atoms limits its efficiency in cold gas. In this study we calculated the dependence of the reaction rate coefficient on the rotational and vibrational state of H2, and evaluated the impact on the abundance of OH in interstellar regions strongly irradiated by far-UV photons where H2 can be efficiently pumped to excited vibrational states. We used a recently calculated potential energy surface and carried out time-independent quantum mechanical scattering calculations to compute rate coefficients for the reaction O (3P) + H2 (v, j) → OH + H, with H2 in vibrational states v = 0–7 and rotational states j = 0–10. We find that the reaction becomes significantly faster with increasing vibrational quantum number of H2. However, even for high vibrational states of H2 (v = 4–5), for which the reaction is barrierless, the rate coefficient does not strictly attain the collision limit and still maintains a positive dependence with temperature. We implemented the calculated state-specific rate coefficients in the Meudon PDR code to model the Orion Bar PDR and to evaluate the impact on the abundance of the OH radical. We find the fractional abundance of OH is enhanced by up to one order of magnitude in regions of the cloud corresponding to AV = 1.3–2.3 mag, compared to the use of a thermal rate coefficient for O + H2, although the impact on the column density of OH is modest, about 60%. The calculated rate coefficients will be useful to model and interpret JWST observations of OH in strongly UV-illuminated environments.
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Kumar, Nikhal Aswanth. "Managerial Perceptions of the Impact of HRIS on Organizational Efficiency." Journal of Economics and Behavioral Studies 5, no. 12 (2013): 861–75. http://dx.doi.org/10.22610/jebs.v5i12.459.
Full textAbstract:
This study evaluates the impact of the HRIS system on HR functions, time management, cost management, managerial satisfaction and organizational efficiency. A sample of 101 managers was drawn from a Municipality in South Africa using cluster sampling. Data was collected using a selfdeveloped, closed-ended questionnaire comprising of 28 items, the psychometric properties (validity, reliability) of which was statistically assessed using Factor Analysis and Cronbach’s Coefficient Alpha respectively. Data was analyzed using descriptive and inferential statistics. The results indicate that managers have a fairly positive view of the impact of the HRIS on organizational effectiveness with the greatest degree of confidence being placed on the impact of HRIS on time management and on HR functions. The results confirm that a well implemented and managed HRIS enables readily available information to be translated into more information sharing, greater knowledge transfer and management. Consequently, the HRIS has the potential to enhance the speed and quality of decision making and the realisation of the HR strategy, thereby enhancing organizational effectiveness.
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Wang, Jun, Yongjun Shen, and Shaopu Yang. "Dynamical analysis of a single degree-of-freedom impact oscillator with impulse excitation." Advances in Mechanical Engineering 9, no. 7 (2017): 168781401771661. http://dx.doi.org/10.1177/1687814017716619.
Full textAbstract:
In this article, the dynamical behavior of a single degree-of-freedom impact oscillator with impulse excitation is studied, where the mass impacts at one stop and is shocked with impulse excitation at the other stop. The existing and stability conditions for periodic motion of the oscillator are established. The effects of system parameters on dynamical response are discussed under different initial velocities. It is found that smaller shock gap than impact gap could make the periodic motion more stable. The decrease in natural frequency would consume less impact energy, make the vibration frequency smaller, and reduce the vibration efficiency. Finally, the dynamical properties are further analyzed under a special case, that is, the shock gap approaches zero. It could be seen that the larger shock coefficient and impact restitution coefficient would make vibration period smaller. Based on the stability condition, there are an upper limit for the product of shock coefficient and impact restitution coefficient, so that a lower limit of corresponding vibration period exists.