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1
Sun, Xinchao, Lianyu Zhao, and Zhenzhong Liu. "A model reference adaptive variable impedance control method for robot." MATEC Web of Conferences 336 (2021): 03005. http://dx.doi.org/10.1051/matecconf/202133603005.
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As a simple and effective force tracking control method, impedance control is widely used in robot contact operations. The internal control parameters of traditional impedance control are constant and cannot be corrected in real time, which will lead to instability of control system or large force tracking error. Therefore, it is difficult to be applied to the occasions requiring higher force accuracy, such as robotic medical surgery, robotic space operation and so on. To solve this problem, this paper proposes a model reference adaptive variable impedance control method, which can realize force tracking control by adjusting internal impedance control parameters in real time and generating a reference trajectory at the same time. The simulation experiment proves that compared with the traditional impedance control method, this method has faster force tracking speed and smaller force tracking error. It is a better force tracking control method.
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Huang, Xi, Huang Huang, and Zhishen Wu. "Development of a Variable-Frequency Hammering Method Using Acoustic Features for Damage-Type Identification." Applied Sciences 13, no. 3 (2023): 1329. http://dx.doi.org/10.3390/app13031329.
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Hammer testing, a nondestructive testing method, has been demonstrated to provide information on structural damage. One of the biggest challenges with this testing method is the simultaneous identification of surface, internal, and composite damage (consisting of both surface and internal damage) in a complex environment, such as post-disaster. A method of identification based on variable-frequency hammering is proposed to solve this problem. The importance and feasibility of using variable-frequency impact hammers and the generated acoustic data to identify multiple types of damage in concrete structures are presented. First, a type of variable-frequency hammering acoustic feature was generated using acoustic feature extraction and selection based on the acoustic data obtained from variable-frequency hammering. Second, a damage recognition model was established using a support vector machine to identify four types of damage occurring simultaneously in the same concrete member specimens, including a type of composite damage with two types of damage occurring simultaneously within 20 mm. Finally, the feasibility of this variable-frequency hammering method was verified experimentally. This method exhibited good performance, with an accuracy of 97.8%; moreover, the method ensures that the feature dimensionality remains unchanged while increasing the effective information of the data.
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Babajanov, Bazar, and Fakhriddin Abdikarimov. "New Soliton Solutions of the Burgers Equation with Additional Time-dependent Variable Coefficient." WSEAS TRANSACTIONS ON FLUID MECHANICS 19 (February 14, 2024): 59–63. http://dx.doi.org/10.37394/232013.2024.19.6.
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In this article, we use the functional variational method to solve the Burgers equation with an additional time-dependent variable coefficient. The main advantage of the proposed method over other methods is that it allows to obtain more new solutions of the equation. Among the solutions obtained, new soliton solutions should be noted, which are of great importance for revealing the internal mechanism of physical phenomena. Three-dimensional graphs of solutions are constructed using the mathematical program Matlab. For a better understanding of the physical properties of some of the resulting solutions, their graphical representations are shown. This method is effective for finding exact solutions to many other similar wave equations.
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Pierart, Fabian G., Matias Rubilar, and Jaime Rohten. "Experimental Validation of Damping Adjustment Method with Generator Parameter Study for Wave Energy Conversion." Energies 16, no. 14 (2023): 5298. http://dx.doi.org/10.3390/en16145298.
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Effective control strategies are essential for optimizing wave energy production. While theoretical studies have explored various control approaches, experimental validation of these methods remains limited. This study proposes a damping adjustment method as a means to enable the experimental application of resistive control in wave energy systems. The system’s damping is adjusted through a variable electrical resistance coupled to the generator. A mathematical model is developed to capture the interaction between the wave energy converter, generator, and variable resistance. Experimental validation demonstrates a good fit between the experimental results and the mathematical model. Four different DC machines acting as generators are tested to evaluate the influence of the model’s parameters on control capability. Results indicate that DC machines with less internal resistance allow a wider range of damping and power adjustment by using external resistance. The proposed method shows promising results, emphasizing the significance of the DC machine parameters in achieving effective control over system variables. These findings contribute to the development of efficient and reliable control strategies for enhancing wave energy production at small scales.
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Jiang, Angfeng, Deyuan Deng, Wei Dai, Xiuwen You, and Hanwen Lu. "Out-Plane Buckling of Arches with Variable Cross-Section." Buildings 13, no. 11 (2023): 2838. http://dx.doi.org/10.3390/buildings13112838.
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The variable cross-section arch is widely used in practical engineering because of its beautiful arc and excellent mechanical properties. However, there is still no systematic and comprehensive study on the out-plane buckling of variable cross-section arches. In view of this, this paper is focused on the elastic analytical research of out-plane buckling of arches with variable cross-sections under a uniformly distributed radial local load. The pre-buckling and out-plane buckling behavior of a variable cross-sectional arch under an external load is quite different from that of an arch with a uniform cross-section. Castigliano’s second theorem is used to establish pre-buckling force method equilibrium equations for variable cross-sectional arches under a uniformly distributed radial local load, and corresponding analytical solutions of normal stress, axial compression, and the bending moments are obtained. Based on the energy method and the Ritz method, analytical solutions of the critical load for the elastic out-plane buckling of arches with variable cross-sections are derived. Comparisons with ANSYS results indicated that the analytical solutions are able to accurately predict the pre-buckling internal forces and critical out-plane buckling load of variable cross-section arches subjected to a uniformly distributed radial local load. It is found that the internal forces and the out-plane buckling load of an arch are significantly affected by the variation of cross-sectional height. As the ratio of the arch’s cross-sectional height increases, the bending moment decreases, and the axial force and critical out-plane buckling load increase. Analytical solutions of pre-buckling internal force and critical out-plane buckling load problems for arches with variable cross-sections have a wider significance since they can provide an effective explicit analytic method for the optimal design of arch structures.
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Liu, Yande, Yanrui Zhou, and Yuanyuan Pan. "Online quantitative analysis of soluble solids content in navel oranges using visible-near infrared spectroscopy and variable selection methods." Journal of Innovative Optical Health Sciences 07, no. 06 (2014): 1350065. http://dx.doi.org/10.1142/s179354581350065x.
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Variable selection is applied widely for visible-near infrared (Vis-NIR) spectroscopy analysis of internal quality in fruits. Different spectral variable selection methods were compared for online quantitative analysis of soluble solids content (SSC) in navel oranges. Moving window partial least squares (MW-PLS), Monte Carlo uninformative variables elimination (MC-UVE) and wavelet transform (WT) combined with the MC-UVE method were used to select the spectral variables and develop the calibration models of online analysis of SSC in navel oranges. The performances of these methods were compared for modeling the Vis-NIR data sets of navel orange samples. Results show that the WT-MC-UVE methods gave better calibration models with the higher correlation coefficient (r) of 0.89 and lower root mean square error of prediction (RMSEP) of 0.54 at 5 fruits per second. It concluded that Vis-NIR spectroscopy coupled with WT-MC-UVE may be a fast and effective tool for online quantitative analysis of SSC in navel oranges.
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Afandi, Pandi, and Helwen Heri. "Influence Factors Internal and External Factors Motivation and Performance of Employees: Do not Stay Civil Service Policy Unit." International Journal of Economics and Finance 8, no. 6 (2016): 258. http://dx.doi.org/10.5539/ijef.v8n6p258.
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<p>This research of background that directional and effective use of labor represent key toward the make-up of officer performance so that need to District Police Public Service head to make a manage the members always enthusiastic in working and having positive in executing work.Effort roomates can be a head-to Increase the activity spirit of enthusiasm, that is by giving good motivation and job performance.Intention of this research is to know and Analyzed do internal factors variable, external factor variable and motivation have influenced the which significantly either through partial and Also simultaneously to job performance officer, and Also from internal factors variable, external factor variable and motivation is the which most having an effect on the which to job performance officer.</p><p>This research is a survey verification sampling on 200 people from 236 respondend contract employee population of District Police Public Service Riau Province.This research represent research highlighting clarification relation between research variables and test hypotheses have been Formulated Previously roomates.Hereinafter technique intake of sample is used by population technique, where samples taken pursuant to SEM formula for 25 manifest variables using a minimum of 200 samples.Technique Analyzed using descriptive and quantitative analysis by applying the method of Structural Equation Modelling (SEM) with Analysis of Moment Structures (AMOS) programe.</p>
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Kidron, Aviv, Yuval Ofek, and Herztel Cohen. "New perspective on the black box of internal auditing and organisational change." Managerial Auditing Journal 31, no. 8/9 (2016): 804–20. http://dx.doi.org/10.1108/maj-07-2015-1220.
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Purpose The shift from the traditional audit towards performance audit implies that internal auditors in the public sector function as change agents who underpin the fundamental change process. This paper aims to propose a model that identifies the determinants of organisational change in the public sector that result from internal auditing and the way internal auditors facilitate it. Design/methodology/approach The conceptual discussion of this paper is based on a review of relevant literature, both practical and academic. Findings This paper develops an innovative model that describes the factors leading to auditees’ change readiness after undergoing internal audit processes. The independent variable is audit information quality and the dependent variable, organisational change. Auditees’ perceptions is the mediator variable, and accessibility to audit information is the moderator variable. Practical implications The proposed model suggests the advantages that can be gained by audit-related services, which in turn will add value to the organisation. The relationships between the variables inform practitioners on how to support effective audits as a means of increasing performance and influencing organisational change. Originality/value As the paper offers an innovative model, it may open up new research areas in internal auditing that can be studied by using both qualitative and quantitative methods.
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Song, Yuegang, Songlin Jin, and Zhenhui Li. "Venture Capital and Chinese Firms’ Technological Innovation Capability: Effective Evaluation and Mechanism Verification." Sustainability 14, no. 16 (2022): 10259. http://dx.doi.org/10.3390/su141610259.
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Making the financial industry a solider mainstay of the real economy is of great concern for China in the midst of economic reform. For China, leveraging venture capital (VC) to enhance a firm’s technological innovation capability (TIC) is an important means of actualising its innovation and development strategy, as well as a must-do to realise sustainable development. In this study, firms that went public from 2010 to 2020 on the A-stock market were used as samples to study the effects of VC on TIC and the relevant mechanism based on the difference-in-differences (DID) method. As research findings show, VC can improve TIC through the medium of the internal incentive and external constraint easing effects. The contributory role of VC in TIC varies with firm size, ownership, and industry type. A range of robustness tests, including the PSM, variable substitution, and instrumental variable methods, further strengthened the reliability of the conclusions. This study can enlighten policymakers on how to implement comprehensive resource factor market reform to build a favourable innovation environment that materialises the role of marketisation.
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Jumadi, Jumadi. "Pengaruh Pemasaran Internal dan Kualitas Layanan Internal Terhadap Kepuasan Pelanggan Internal (Studi Pada Industri Kepariwisataan di Daerah Istimewa Yogyakarta)." Jurnal Ekonomi dan Bisnis 17, no. 3 (2016): 17. http://dx.doi.org/10.24914/jeb.v17i3.285.
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<em>The aim of this research is to investigate the implication of internal marketing and internal service quality effectivity towards internal customer satisfaction in Tourism Industry in Yogyakarta Special Territory. This internal marketing studyinvolves variables of motivation and reward system, effective communication, effective employee's selection, effective recruitment, effective development, effective support system, and healthy work environment. While the internal quality service aspects that will be examined in this study are: tangible, emphaty, responsiveness, reliability and assurance, and then their influences on internal customer satisfaction would be analyzed.The sample size is 210 respondents,which is determined using purposive sampling method. The main instrument for data collection in this study is through questionnaire. The analysis tool used to examine the hypothesis of the study is Structural Equation Modeling using AMOS Version 20.0 Software. The result of the study shows that: Internal marketing and internal quality service significantly influence internal customers satisfation. However, the internal quality service influence the internal customers satisfaction more significantly. Therefore the managers in tourism industry should improve the internal marketing more than the internal quality service.</em>
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Thamrin, Muhammad, Jabal Tarik Ibrahim, Sutawi Sutawi, et al. "Agricultural Extension Performance Through the Use of Internet Media." E3S Web of Conferences 432 (2023): 00021. http://dx.doi.org/10.1051/e3sconf/202343200021.
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The presence of information technology is a challenge for field agricultural extension to master computer skills and utilize the internet. The purpose of this study was to determine the performance of field agricultural extension and the effect of internal and external characteristics of extension on the utilization of internet media in Deli Serdang Regency. The population and research sample were 139 people using the census method. This study uses descriptive analysis, Pearson product moment correlation, multiple regression analysis, and effective contribution testing. The results showed that the measurement of the performance of agricultural extension with the highest value of 44.6 % was in the good category. The results of simultaneous correlation and regression tests through the F test show that there is a significant relationship and influence between each variable. Partially in multiple regression tests, the variables of age, education level, internet media ownership, perception of the internet, and internet usage patterns have a significant effect, while the variable of agency support has no significant effect on internet media utilization for extension. Based on the calculation of effective contribution, the variable internet usage pattern shows the largest effective contribution of 19.87 % with a relative contribution of 39.15 %.
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BAHRII, Olena. "ITERATIVE ALGORITHMS FOR SOLVING A PLANE PROBLEM FOR AN ENVIRONMENT WITH SIGNIFICANT MANIFESTATION OF INTERNAL FRICTION." Herald of Khmelnytskyi National University. Technical sciences 311, no. 4 (2022): 42–45. http://dx.doi.org/10.31891/2307-5732-2022-311-4-42-45.
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The purpose of research is to develop an algorithm for solving of a flat nonlinear problem of mechanics of discrete environment, which laws of deformation of take into account the effect of the internal friction. Described the explanation of the iterative algorithm for the numerical solution of the plane physically nonlinear boundary value problems of mechanics of discrete environment. Feature of the problem is the consideration of the effect of internal Coulomb friction on the deformation of the environment. When solving the problem in displacements for finite simplex elements, the continuity conditions are always satisfied at the nodes and at the faces of the element. Solving the system of canonical linear equations of the displacement method ensures the fulfillment of the equilibrium conditions in each node of the discrete computational domain. Therefore, the calculation procedure is organized in such a way that the obtained solutions also comply with the laws of deformation of the material. Known iterative methods of variable stiffness, initial stresses or initial deformations, which differ only in the method of obtaining solutions, can be used for this purpose. The analysis showed that the most effective method for solving the formulated physically nonlinear problem is the variable stiffness, on the basis of which the iterative algorithm was developed. Described in the article iterative algorithm for solving of a flat boundary value problems of mechanics of a discrete environment allows to take into account the influence on the process of deformation internal friction. It can also be used to solve problems in the mechanics of solid deformable body with a most influence of internal friction, thermo-elasticity problems, etc.
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Khaliullin, Farit, Andrey Yakunin, Zulfiya Khaliullina, Gennady Pikmullin, and Ildar Galiaskarov. "Study of the intake system of automotive tractor internal combustion engines with variable parameters." E3S Web of Conferences 431 (2023): 01038. http://dx.doi.org/10.1051/e3sconf/202343101038.
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Increasing the effective performance of automotive tractor engines is primarily associated with the intensification of the working process parameters. One of the options for solving this problem is to improve the cylinder filling parameters, which will allow to increase the engine power and torque. In addition to mechanical and gas turbine supercharging, the little-studied resonant supercharging of the engine is of interest. In this case, by selecting the parameters of the inlet path of the engine, it is possible to achieve a significant increase in pressure in the zone of the inlet valve opening without expenditure of useful energy, using only the kinetic energy of the gases of the inlet path. The paper proposes a method to calculate the geometric parameters of the intake tract using a one-dimensional model of gas flow. The results obtained from the numerical investigations give good convergence. The article can be useful for masters, graduate students, and engineering and technical workers involved in the design of internal combustion engines.
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Anggraini, Leriza Desitama, and Andini Utari Putri. "THE IMPLEMENTATION OF GOOD CORPORATE GOVERNANCE AND THE GOVERNMENT’S INTERNAL CONTROL SYSTEM IN EFFORT TO IMPROVE THE QUALITY OF REGIONAL FINANCIAL REPORTS IN PALEMBANG CITY." FINANCIAL: JURNAL AKUNTANSI 9, no. 1 (2023): 90–96. http://dx.doi.org/10.37403/financial.v9i1.512.
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The implementation of good corporate governance should be supervised and controlled both internally and externally so that the quality of LKPD can be guaranteed. SPIP also has a role in controlling which has the impact of the presentation of quality financial reports. This study aims to find out how much the implementation of good corporate governance and the government's internal control system is to improve the quality of regional financial reports in Palembang City. This study used a sample of 58 respondents in the Regional Financial and Asset Management Agency (BPKAD) Palembang City. The research method uses descriptive quantitative methods using statistical calculations with SPSS as an analytical tool. In this study, descriptive statistics were used along with reliability, validity, and traditional assumption tests (like the tests for normality, multicollinearity, autocorrelation, and heteroscedasticity), multiple linear regression analysis, and hypothesis testing (like the simultaneous test, partial test, and test of the coefficient of determination). The study's findings indicate that both effective corporate governance and internal control systems have a favourable impact on the accuracy of financial reports. The independent variables of sound corporate governance and an effective internal control system are concurrently positive and significant to the independent variable, which is the calibre of financial reports, according to the statistical test F.Keywords: Governance, Internal Control, Financial Statements
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Novriansa, Agil, and Fida Muthia. "Local government internal auditor stress and burnout: Supervisor support as a moderating variable." Jurnal Tata Kelola dan Akuntabilitas Keuangan Negara 9, no. 2 (2023): 227–45. http://dx.doi.org/10.28986/jtaken.v9i2.1247.
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This study aims to empirically examine the direct relationship between stress arousal and burnout and the moderating effect of supervisor support on the relationship between the two dimensions experienced by local government internal auditors. This study uses an online survey method with a questionnaire. The sample for this study was 155 local government internal auditors from 17 City/Regency Government Inspectorate Provinces from Southern Sumatra. Based on the data analysis using SEM-PLS, the results of this study indicate that stress arousal is positively related to emotional exhaustion and depersonalization but not to reduced personal accomplishment. The results of this study also indicate that supervisor support is able to moderate the relationship between stress arousal and burnout. Supervisor support can reduce the effects of stress arousal on emotional exhaustion and depersonalization experienced by local government internal auditors and strengthen the effects of stress on personal accomplishment. Theoretically, this study supports the conservation of resources theory, which shows that supervisor support is a resource that acts as an effective coping strategy in reducing the effects of stress arousal and preventing burnout. The results also provide insights for policymakers to develop interventions for communication and monitoring based on personal conditions to improve interpersonal relations between supervisors and subordinates.
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Indrajaya, Danang, Muji Astuti, Ahmad Maulidizen, and Naufal Kurniawan. "The Effect of Third-Party Funds, Capital Adequacy Ratio, Casa Ratio, Bi Rate, And Inflation Towards The Distribution of Credit Banking in Indonesia." International Journal of Economics Development Research (IJEDR) 2, no. 3 (2022): 171–85. http://dx.doi.org/10.37385/ijedr.v2i3.282.
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This research aims to determine the effect of internal and external factors on bank lending. The independent variables analyzed were Third-Party Funds (DPK), Capital Adequacy Ratio (CAR), CASA ratio, BI rates, and inflation. While the dependent variable in this study is bank credit distribution. This research was conducted by taking secondary data through the publication of Bank Indonesia (www.bi.go.id), the Financial Services Authority (www.ojk.go.id), and Bureau Van Dijk (www.orbis.bvdinfo.com). The population in this study are banks listed on the Indonesia Stock Exchange (IDX). A sampling of this study was conducted using the purposive sampling method, which amounted to 15 banks with the largest assets in Indonesia in 2018. The research period used is based on annual banking reports, 2011-2018. This research is a quantitative study using the FEM (Fixed Effect Model) method. The results of this research indicate that the variable of Third-Party Funds, Capital Adequacy Ratios, CASA ratio, and Inflation is significantly effective towards the distribution of credit banking partially. On the other hand, the variable BI rate is not significantly effective to the distribution of credit banking. Meanwhile, DPK, CAR, CASA, BI rates, and inflation simultaneously have a significant effect on the distribution of credit banking.
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Wang, Yuanhui, and Yiming Chen. "Dynamic Analysis of the Viscoelastic Pipeline Conveying Fluid with an Improved Variable Fractional Order Model Based on Shifted Legendre Polynomials." Fractal and Fractional 3, no. 4 (2019): 52. http://dx.doi.org/10.3390/fractalfract3040052.
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Viscoelastic pipeline conveying fluid is analyzed with an improved variable fractional order model for researching its dynamic properties accurately in this study. After introducing the improved model, an involuted variable fractional order, which is an unknown piecewise nonlinear function for analytical solution, an equation is established as the governing equation for the dynamic displacement of the viscoelastic pipeline. In order to solve this class of equations, a numerical method based on shifted Legendre polynomials is presented for the first time. The method is effective and accurate after the numerical example verifying. Numerical results show that how dynamic properties are influenced by internal fluid velocity, force excitation, and variable fractional order through the proposed method. More importantly, the numerical method has shown great potentials for dynamic problems with the high precision model.
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Agustina, Inneke, and Emmy Indrayani. "THE FACTORS EFFECT ON THE QUALITY OF FINANCIAL STATEMENTS." Jurnal Ilmiah Ekonomi Bisnis 26, no. 3 (2021): 237–48. http://dx.doi.org/10.35760/eb.2021.v26i3.3728.
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Indications of fraud or errors in financial statements cause the information presented to be unreliable, irrelevant, incomparable, and inapplicable. Unqualifiedfinancial statements cannot be used by various parties, especially in corporate decision-making. The quality of financial statements can be created through the application of information technology and internal controls which are effective and efficient. This study aims to analyze how the effect of the accounting information system and internal control system in the Indonesian Television PublicBroadcasting Institute (LPP TVRI). The independent variables used are the Accounting Information System and the Internal Control System. Meanwhile, the dependent variable used is the Quality of Financial Statements. The data were obtained using a questionnaire and analyzed using the Partial Least Square (PLS)method. The sample used in this study was 36 employees who work in the Budget, Accounting and Taxation, and Internal Audit, divisions. The results of this study indicate that the accounting information system has a significant effect on the quality of financial statements. Meanwhile, the internal control system has no significant effect on the quality of financial statements.
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Wu, Guang Hui, You Sheng Lin, Zhao Sheng Yu, and Xiao Qian Ma. "Off-Design Load Characteristics of Consumption-Deviation Coefficient for 300MW Circulating Fluidized Bed Coal-Fired Unit." Applied Mechanics and Materials 529 (June 2014): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amm.529.267.
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The optimization target system of a 300MW circulating fluidized bed coal-fired unit was established by using the method of K-Means clustering algorithm to determine the variable condition calculated benchmark value point. This method was proved to be effective, and the results supply a new idea and effective method for determining benchmark values models. The off-design load characteristics of consumption-deviation coefficient mainly have three trends, and the condenser vacuum, relative internal efficiency of steam turbine and oxygen content in exhaust gas were the primary influencing parameters of energy-loss analysis. Through energy-loss analysis method, providing an accurate and effective guidance for the management and saving energy, and it has a good economic advantages and promoting significance.
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Ueno, Akira, Honghu Guo, Akihiro Takezawa, Ryota Moritoyo, and Mitsuru Kitamura. "Temperature Distribution Design Based on Variable Lattice Density Optimization and Metal Additive Manufacturing." Symmetry 13, no. 7 (2021): 1194. http://dx.doi.org/10.3390/sym13071194.
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Additive manufacturing (AM) is employed for fabricating industrial products with complex geometries. As topological optimization is suitable for designing complex geometries, studies have combined AM and topological optimization, evaluating the density optimization of lattice structures as a variant of topological optimization. The lattice structures of components fabricated via AM comprise voids. Models designed using topological optimization should be modified to ensure structures suitable for AM. As the lattice unit can be easily fabricated using AM with fewer design modifications, this study uses lattice density optimization for an industrial AM product. We propose a method of optimizing the lattice distribution for controlling the surface temperature uniformity of industrial products, such as molds. The effective thermal conductivity of the lattice is calculated using the homogenization and finite element methods. The effective thermal conductivity changes depending on the internal pore sizes. The proposed methodology is validated using a 3D example; the minimization problem of surface temperature variations in the target domain is considered. The variable density of the embedded lattice in the target domain is optimized, and we experimentally validated the performance of the lattice unit cell and optimal 3D structure using metal powder bed fusion AM.
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Koo, Ki-Young, and Jin-Hak Yi. "Substructural Identification of Flexural Rigidity for Beam-Like Structures." Shock and Vibration 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/726410.
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This study proposes a novel substructural identification method based on the Bernoulli-Euler beam theory with a single variable optimization scheme to estimate the flexural rigidity of a beam-like structure such as a bridge deck, which is one of the major structural integrity indices of a structure. In ordinary bridges, the boundary condition of a superstructure can be significantly altered by aging and environmental variations, and the actual boundary conditions are generally unknown or difficult to be estimated correctly. To efficiently bypass the problems related to boundary conditions, a substructural identification method is proposed to evaluate the flexural rigidity regardless of the actual boundary conditions by isolating an identification region within the internal substructure. The proposed method is very simple and effective as it utilizes the single variable optimization based on the transfer function formulated utilizing Bernoulli Euler beam theory for the inverse analysis to obtain the flexural rigidity. This novel method is also rigorously investigated by applying it for estimating the flexural rigidity of a simply supported beam model with different boundary conditions, a concrete plate-girder bridge model with different length of an internal substructure, a cantilever-type wind turbine tower structure with different type of excitation, and a steel box-girder bridge model with internal structural damages.
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Xu, Tao, Dongbo Shi, Di Zhang, and Yonghui Xie. "Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane." Applied Sciences 13, no. 3 (2023): 1446. http://dx.doi.org/10.3390/app13031446.
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The gas turbine blades are scoured by high temperature gas sustainedly and long-term in harsh environment. It is of great significance to explore effective cooling methods to lower the turbine blade temperature so as to ensure safe and stable operation of the gas turbine. However, there are few studies on the cooling channel considering the turning vane, variable cross-section characteristics, and rotation effect. In this paper, five kinds of serpentine cooling channel models with variable cross-section properties and different thickness guide vanes are constructed. The effects of different thickness guide vanes on the overall performance of the channel under stationary and rotating conditions are discussed and compared by numerical method. The result shows that when stationary (Re = 10,000-50,000), the turning vane with suitable thickness can increase the Nu/Nu0 by 56.5%. The f/f0 is decreased by 14.2%, and the comprehensive thermal performance is increased by 4.5%. When rotating (Re = 10,000, Ro = 0-0.5), the turning vane with suitable thickness can increase the Nuup/Nu0 and Nuall/Nu0 by 33.0% and 4.0%, respectively. The comprehensive performance of the variable cross-section serpentine channel can be greatly improved by arranging the turning vane structure with appropriate thickness.
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Nie, Ren-Shi, Zheng Wang, Zhangxin Chen, et al. "Stress-sensitive permeability of matrix cores and artificially fractured cores with nonproppant-filled fractures under high-pressure conditions." GEOPHYSICS 86, no. 3 (2021): M59—M75. http://dx.doi.org/10.1190/geo2020-0146.1.
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Stress-sensitive permeability (SSP) influences gas well productivity and is a crucial element influencing gas reservoir development. SSP for high-pressure fractured gas reservoirs with an initial reservoir pressure of more than 20 MPa has never been comprehensively evaluated to the best of our knowledge. SSP experiments with special procedures were designed by adopting the variable confining pressure (VCP) and variable internal pressure (VIP) methods. VCP is a test method in which the confining pressure is altered and a constant internal pressure is maintained for the experimental core holder. VIP is a test method in which the internal pressure is changed and a constant confining pressure is maintained. A four-stage curve analysis method was developed to perform regressions on semilogarithmic curves and exponential curves of experimental data. A method to evaluate the SSP was developed using stress sensitivity coefficients obtained via regressions. A calculation approach for determining the degrees of permeability damage and permeability recovery also was evaluated. In total, six matrix cores and six cores with artificial fractures from a high-pressure fractured sandstone gas reservoir were tested using the two methods. The SSP curves for high-pressure reservoirs were characterized by four-stage variation trends, which show differentiation with low-pressure reservoirs with an initial reservoir pressure less than 20 MPa. The stress sensitivity of the VCP method was stronger than that of the VIP method. The core samples mainly showed a “medium”/“medium-strong” stress sensitivity under low/high effective stress conditions. Compared with matrix cores, fractured cores showed stronger stress sensitivity owing to strong plasticity and weak elasticity. The maximum permeability damage degree reached 99.67%, and the minimum permeability recovery was only 6.9%. Our method of experimental design, four-stage curve analysis, stress sensitivity evaluation, and our overall findings can provide references for future studies on SSP in high-pressure fractured sandstone gas reservoirs.
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Su, Qingdong, Bailin Zha, Jinjin Wang, et al. "Simulation and Application of a New Multiphase Flow Ablation Test System for Thermal Protection Materials Based on Liquid Rocket Engine." Aerospace 9, no. 11 (2022): 701. http://dx.doi.org/10.3390/aerospace9110701.
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Internal flow field ablation is an important issue in thermal protection materials for rocket engines and hypersonic vehicles. In this paper, a new multiphase flow ablation test system, with an Al2O3 particle delivery device based on an oxygen-kerosene liquid rocket engine, is designed and manufactured. A general variable-precision modular system simulation method is proposed to analyze the dynamic characteristics of the system. In addition, a unique internal flow field ablation test was performed on the 4D C/C composite simulating the working conditions of the SRM. The results show that the system can provide a wide temperature range (756~3565 K) and pressure range (0.2~4.2 MPa). The multi-disciplinary dynamic variable-precision system simulation method is helpful for more accurate design and test analysis, and the maximum error is less than 5%. The ablation tests show that the line ablation rate of the C/C composite nozzle at 3380 K and 1 MPa is 0.053 mm/s, verifying the combined effect of thermochemical and mechanical ablation. The ablation environment is controllable, which provides an effective way for the ablation test of thermal protection materials. In addition, the variable-precision dynamic simulation method has important reference value for the system design related to liquid rocket engine.
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Bgantsev, V. M., and A. M. Levterov. "INTERNAL COMBUSTION GAS ENGINES IN SYSTEMS FOR INCREASING THE EFFICIENCY OF FUEL ELEMENTS OF LARGE ENERGY FACILITIES." Internal Combustion Engines, no. 2 (November 15, 2022): 20–24. http://dx.doi.org/10.20998/0419-8719.2022.2.03.
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The proposed article analyzes the potential possibility of increasing the efficiency of an energy complex with a gas turbine and solid oxide high-temperature fuel cells, into the structure of which an auxiliary piston gas engine of internal combustion is integrated. Natural gas, methane was used as an energy carrier. The subject of the research is indicators of the working process of the auxiliary engine when it is working on mixed gas fuel (carbon monoxide - methane) of variable composition. The research was carried out by the computational and analytical method using a simplified method of calculating the working cycle of a piston engine. Solutions to several problems are considered: disposal of carbon monoxide emissions at the exit from fuel cells during their heating; provision of an additional source of electrical energy for powering methane conversion devices and an additional source of heat for its steam-plasma conversion; utilization of carbon monoxide and residues of incomplete methane conversion. Calculation studies of indicators of the working process of an auxiliary gas engine with a capacity of 100 kW on mixed fuel of variable composition (carbon monoxide - methane) show its stable operation with appropriate correction of the fuel supply regulation system. The effective efficiency coefficient in the entire range of fuel concentration slightly changed (from 0.369 to 0.380). Its growth is observed with an increase in the proportion of methane in the mixed fuel. The average effective pressure of the cycle practically does not change, and the maximum pressure of the cycle during engine operation in the entire range of changes in the composition of the mixture is at the level of 8.0 MPa. Slight change in the maximum temperature with an increase in the concentration of methane in the fuel mixture (from 2117 K to 2048 K) has been noticed. The research testified to the effectiveness of the proposed method of improving the environmental and economic characteristics of the energy complex with fuel cells, by including in its structure an auxiliary gas engine with minimal cost adaptation for operation on mixed fuel of variable composition.
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Iorwuese, Kachina Eugene, Danjuma Naisla Hassan, Ilemona Adofu, and Gimba Obadiah. "Public Expenditure and Economic Growth in Nigeria (2001 - 2021)." IIARD International Journal of Economics and Business Management 9, no. 10 (2024): 172–84. http://dx.doi.org/10.56201/ijebm.v9.no10.2023.pg172.184.
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The study attempts to establish the relationship between government spending and GDP in Nigeria from 2001 to 2021. The multiple regression analysis's ordinary least squares (OLS) method was employed. The econometric research shows that the independent variables (recurrent spending, capital expenditure, domestic debt, foreign debt, and exchange rate) have a positive connection with the dependent variable GDP. The OLS findings also show that the overall model accounts for over 94.98% of the changes in the dependent variable (R2 = 0.9498). This means that the variable will have a considerable impact on the GPD. The study suggests that there is an urgent need to instill fiscal discipline in government expenditure by initiating effective internal control measures and more proactive economic management coordination and implementation, as well as discouraging all known productive activities and expenditures at all levels of government. There is also a need for the government to ensure that its expenditures are channeled appropriately to sectors such as infrastructure development in order to boost investment and output, with the expected outcome of price stabilization.
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Latifah, Korinatul, and Marsono Marsono. "PENGARUH EFEKTIVITAS KOMITE AUDIT TERHADAP INTERNET FINANCIAL REPORTING." JURNAL AKUNTANSI DAN AUDITING 17, no. 2 (2022): 67–89. http://dx.doi.org/10.14710/jaa.17.2.67-89.
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This study aims to examine the effect of the effectiveness of the audit committee on Internet Financial Reporting (IFR). Variables used in the equation are size of audit committee, independent audit committee, audit committee financial expertise, and audit committee meeting frequency as independent variables, as well IFR as the dependent variable. The population used in this study were manufacturing companies in 2018-2019 with a total sample of 216 samples. Sampling is based on purposive sampling method with certain criteria. Panel data regression analysis with the GLS approach is the analytical method used in the study. The results showed that the size, independence, and financial expertise of the audit committee do not influence IFR. So that these three variables are not effective in increasing the IFR score. Meanwhile, the frequency of audit committee meetings has a positive and significant effect on IFR, and indicates that the frequency of meetings is an important characteristic in assessing the effectiveness of the audit committee on IFR.
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Evi, Evi Lutfiyana, and Rilla Gantino. "Implementation Audit Internal of Quality Management System Iso 9001:2015 in the Purchasing Activities Technical Department at Pt Sango Indonesia." Journal of Economics, Finance and Accounting Studies 5, no. 2 (2023): 75–88. http://dx.doi.org/10.32996/jefas.2023.5.2.8.
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This study analyzes of implementation audit internal of the quality management system ISO 9001:2015 in the purchasing activities technical department at PT Sango Indonesia. The aims of this study are to understand the quality standard and quality improvement of PT Sango Indonesia, analyze ISO 9001:2015 quality management standard operational procedure (SOP) in purchasing activities and determine the impact of implementing ISO 9001:2015 internal quality management systems on product quality. This research uses a qualitative descriptive method; the population in this research is all employees at PT Sango Indonesia is 103 employees. The sample in this study was taken from 55 employees who are related to variable research. Meanwhile, the technique of research uses observation, interviews, questionnaires and documentation. Besides that, they analyze data using internal control questionnaire (ICQ), Likert scale and uji statistics. The results of this research show that the implementation of the internal audit quality management system ISO 9001:2015 uses internal control questionnaire (ICQ) in the standard operational procedure (SOP) of purchasing activities at PT Sango Indonesia for each department obtained good strength where department user get percentage middling effective, leadership gets effective, engineering middling effective, purchasing effective, supplier middling effective and accounting effective. In order to support of purchasing activities continuity, In order to support of purchasing activities continuity, it is necessary to create an information system that can provide convenience for purchasing activities process so that the information produced is accurate and appropriate. Then, the average achievement of implementation internal audit for each indicator at PT Sango Indonesia is very effective on internal audit competency and scope internal audit, besides other indicators achievement results are effectiveness. Meanwhile, the result of the statistical test showed that internal audits had a significant effect on product quality with the indicators used by researchers. Thus, the company must disseminate information related to certification ISO 9001:2015 that it carries out activities according to established procedures.
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Vasić, Miloš, and Zagorka Radojević. "Drying Kinetic Simulation of Clay Tiles Made from the Raw Material Having Less Clay Fraction." Advanced Materials Research 1036 (October 2014): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.3.
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In order to describe the internal moisture rate and to take all different mechanisms of moisture movement into account, it is suitable to use effective diffusivity as a measure of moisture rate, irrespectively of the mechanisms really involved. This means that all different mechanisms and driving forces for internal moisture transport are lumped together and introduced into effective moisture diffusivity. Hence, diffusion equations are retained and reused with the effective diffusivity coefficient as a measuring parameter of internal moisture ratio. In our previous studies we have presented the calculation method which assumed constant diffusivity. The next goal was to estimate effective diffusivity at various moisture contents, in a real case of non-linear drying curves, and to predict drying kinetic. In our last study we have developed a model for determination of the variable effective diffusivity and identification of the exact transition points between possible drying mechanisms. In this paper we have tried to develop more accurate tool for determination of time dependent effective moisture diffusivity. An analytical model and computing procedure were developed to evaluate mass transfer properties and describe drying kinetic of clay tiles having less clay fraction. The proposed procedure was validated with experimental drying data. Presented results have demonstrated that the proposed dying model can be applied for the accurate description of experimental drying kinetics and a reliable estimation of effective diffusivity.
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Chen, Wei, and Guo Zhu Liang. "An Optimization Approach of SRM Sphere Slot Grain Design Based on Improved Differential Evolution Algorithm." Advanced Materials Research 971-973 (June 2014): 1072–75. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1072.
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The sphere slot is a 3D configuration of solid rocket motor (SRM) grain. Accompanied with multi-design-variable and strong constraints, its optimization is always a complicated problem. In this article, a methodology has been presented for the optimization of sphere slot grain configuration. Parameterized CAD model method and unsteady lumped parameter internal ballistic model are adopted to evaluate the performance of sphere slot grain to establish the optimization objective and constraint functions. An improved differential evolution algorithm incorporated with Oracle penalty function method is developed and applied on the optimization to solve global optimum solution converging difficulty of multi-variable constrained problem. The approach is validated by a small sphere slot SRM. The results illustrate it is effective method and has robustness and efficient capacity to explore the design space for global optimum solution of sphere slot grain.
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Sun, Zuo Zhen, Guang Wei Meng, Feng Li, and Li Ming Zhou. "Interval Perturbation Method to Structural Non-Probabilistic Reliability Analysis." Advanced Materials Research 712-715 (June 2013): 1527–30. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1527.
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In structural non-probabilistic reliability analysis, the uncertain structural parameters are assumed to be the interval parameters. The commonly used probability model will lose accuracy when there is not enough experimental date for the reliability analysis. Conversely, the interval model only requires the upper and lower bound of the uncertain variable, which is more reasonable compared with the probabilistic model. The interval perturbation method is applied in this paper to compute the non-probabilistic reliability index, where the interval expansion problem has been effectively controlled. The precision of computing the reliability index is effectively improved, solving the problem of the non-probabilistic reliability index in a new way. The numerical results prove that this method is effective and feasible.
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Khoirunnisa, Ni'ma, and Siti Achiria. "Model Perhitungan Biaya Produksi Islami Menggunakan Metode Variable Costing (Studi Kasus Usaha Susu Shi Jeckex Cabang Jogja)." JESI (Jurnal Ekonomi Syariah Indonesia) 9, no. 1 (2019): 9. http://dx.doi.org/10.21927/jesi.2019.9(1).9-19.
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<p><em>Every company is required to run its business very well. The success of a company is very much determined by the accuracy and ability of the leader in managing the company. Production costs are one part of the internal steps that must be taken in increasing efficiency. In Islam there is a classification of costs before calculating production costs because not all funds that come out are calculated as production costs. The company can exercise control over activities that do not add value, which refers to cost control to be effective by applying Variable Coasting methods. Because it is seen from the method of calculation, the variable costing approach is more practical and easy to analyze. The results show that, using a calculation with a variable costing approach, the total production costs are lower than the calculation of real use, which is Rp. 55. 718,000 while using the real calculation, the results are greater, which is Rp. It can be seen that the calculation of the company's real production costs is higher than the calculation of production costs using the variable costing method. There is also the main difference between the real calculation of the company and the calculation of variable costing which is located in the treatment of factory overhead costs. The company's real calculations use fixed factory overhead and variable calculations while the variable costing method only calculates variable overhead costs.</em></p><p><strong><em>Keywords</em></strong><em> : Cost, Productions Cost, Variable Costing</em></p>
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Abbas, Ruba F., Ali A. Waheb, Howraa K. Hami, and Neda I. Mahdi. "Smartphone Digital Image Using for Determination of DCH by a Diazotization Reaction." Current Analytical Chemistry 16, no. 8 (2020): 988–95. http://dx.doi.org/10.2174/1573411015666191202152544.
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Background: Simple, sensitive, and economic colorimetric device based on a smartphone digital image coupled with Color Grab™ application was developed for DCH drug determination. The method is based on the diazotization reaction of benzocaine with DCH drug to get an orange azo dye. Methods: Variable parameters such as volumes of reagents, the internal walls and ambient light have been analyzed and optimized. From the optimized conditions, a calibration curve was created by the effective intensity (IG) of an orange azo dye, a correlation of determination is 0.999 and limit of detection 0.808 mg/L. Results: The results of the Smartphone method were statistically compared with the reference method using a t-test and found to be a good agreement. Conclusion: This method requires neither solvent extraction and temperature control, also it has achieved an extensive linear range and low limit of detection compared with different methods reported in the literature.
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Nugraha, Darya Setia, and Teti Widia Komarawati. "Performance of Local Government Apparatuses and Public Services: Survey on SKPD Kabupaten Bandung Barat Government." Indonesian Journal of Economics and Management 3, no. 1 (2022): 174–85. http://dx.doi.org/10.35313/ijem.v3i1.4705.
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One of the efforts made by the Government of Kabupaten Bandung Barat in avoiding the practice of KKN so that the goal of implementing good governance can be achieved is by implementing the government internal control system. In addition, the purpose of the government is to conduct public services that are effective and efficient, which can be seen from the commitment and performance of local government apparatus. This research aims to determine the effect of good governance, internal control system of Government and the organizational commitment to the public service through the performance of local government apparatus as an intervening variable. The type of research used is quantitative. The population in this research is the regional government working unit in the Kabupaten Bandung Barat government. The samples in this study were as much as 28 SKPD with a total of 208 respondents. Method of collecting data using questionnaires. Data analysis method using path analysis processed with IBM SPSS software version 26.0. Based on the results of the research, there is a positive and significant effect of good governance, government internal control system and organizational commitment to the performance of government apparatus both partially and simultaneously. The performance of local government apparatus has a positive and significant effect on public services. There is an indirect effect of good governance, government internal control system and organizational commitment to public service through the performance of local government apparatus as an intervening variable.
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Muhith, Abdul, Eko Winarti, S. S. Idola Perdana, Sri Haryuni, Kun Ika Nur Rahayu, and Anwar Mallongi. "Internal Locus of Control as a Driving Factor of Early Detaction Behavior of Servical Cancer by Inspection Visual of Acetic Acid Method." Open Access Macedonian Journal of Medical Sciences 8, E (2020): 113–16. http://dx.doi.org/10.3889/oamjms.2020.4341.
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BACKGROUND: Cervical cancer is one of the main reproductive health problems, and it is a cause of death to women in the world, especially in developing countries like Indonesia. Inspection visual of acetic acid (IVA) is an inexpensive and effective initial examination to detect cervical cancer.
 AIM: The aim of the study was to find out the correlation of the locus of control and the behavior of early detection of cervical cancer by the IVA method.
 METHODS: The research design was a cross-sectional study. The sample of the study was 393 respondents. The sampling technique was multi-stage random sampling, conducted at nine community health centers (Puskesmas) in Kediri City. The instruments used in the study were a questionnaire that had been tested for its validity and reliability for locus of control, and observation sheets for the early detection of cervical cancer by the IVA method. The data analysis technique used is the Spearman rho test with a value of α = 0.05.
 RESULTS: Spearman rho test results obtained a significance value of 0.000 lower than that of α = 0.05, meaning there was a significant correlation between the locus of control variable and behavior of early detection of cervical cancer by IVA method.
 CONCLUSION: The conclusion was that there was a significant correlation between the locus of control variable and the early detection behavior of cervical cancer by the IVA method. The higher the internal locus of control in a woman, the better the behavior of early detection of cervical cancer by the IVA method.
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Xiao, Yue, Limin Tang, and Jiawei Xie. "Calculation Method of Permanent Deformation of Asphalt Mixture Based on Interval Number." Materials 14, no. 9 (2021): 2116. http://dx.doi.org/10.3390/ma14092116.
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There are great uncertainties in road design parameters, and the traditional point numerical calculation results cannot reflect the complexity of the actual project well. Additionally, the calculation method of road design theory based on interval analysis is more difficult in the use of uncertain design parameters. In order to simplify the calculation process of the interval parameters in the road design theory, the asphalt pavement design is taken as the analysis object, and the permanent deformation of the asphalt mixture is simplified by combining the interval analysis theory. Considering the uncertainty of the design parameters, the data with boundaries but uncertain size are expressed in intervals, and then the interval calculation formula for the permanent deformation of the asphalt mixture is derived, and the interval results are obtained. In order to avoid the dependence of interval calculation on the computer code, according to the interval calculation rule, the interval calculation method with the upper and lower end point values as point operations is proposed. In order to overcome the contradiction between interval expansion results and engineering applications, by splitting the multi-interval variable formulas, the interval variable weights are reasonably given, and the synthesis of each single interval result realizes a simplified calculation based on interval variable weight assignment. The analysis results show that the interval calculation method based on the point operation rule is accurate and reliable, and the simplified method based on the interval variable weight assignment is effective and feasible. The simplified interval calculation method proposed in this paper provides a reference for the interval application of road design theory.
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Khalid Ahmed, Azam Abdelhakeem, and Adel M. Sarea. "Factors Influencing Internal Shariah Audit Effectiveness: Evidence From Bahrain." International Journal of Financial Research 10, no. 6 (2019): 196. http://dx.doi.org/10.5430/ijfr.v10n6p196.
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It is this research’s objective to analyze factors that cause an effective internal Shariah audit among the Islamic Financial Institutions (IFIs) in Bahrain. The questionnaire method has been employed to examine the said topic. The questionnaire’s primary source of information was the Accounting and Auditing Organizations for Islamic Financial Institutions (AAOIFI) Governance Standards. Meanwhile, the respondents are consisted of 52 IFIs’ head of internal Shariah audit department. These IFIs are registered with the Central Bank of Bahrain. To analyze those relationships the structural equation method (SEM) via SmarPLS3.0 has been adopted. The study has found that the effective execution of internal Shariah audit is positively linked with the competency and performance of internal Shariah audit. Meanwhile, the other two variables, i.e. being independent and Shariah supervisory board have been discovered to be positively related with internal Shariah audit effectiveness. Nonetheless, there is no significant contribution. Overall, all the variables contribute 63.2% to IFIs’ internal Shariah audit effectiveness. The regulatory and professional bodies may benefit from this study in their assessment of factors that result in a successful and meaningful internal auditing of Shariah matters.
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Purwaningsih, Fauziah Nur, and Mekar Meilisa Amalia. "PENGARUH SISTEM PENGENDALIAN INTERNAL TERHADAP KINERJA PERUSAHAAN (STUDI KASUS CV. SUKSES ABADI)." Worksheet : Jurnal Akuntansi 1, no. 1 (2021): 53–61. http://dx.doi.org/10.46576/wjs.v1i1.1542.
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A very important part of the company's operational management that reflects thecondition of the company's performance is internal control. Effective internalcontrol can help companies safeguard company assets, ensuring the availability ofaccurate financial reports. To determine the internal control system affectscompany performance at CV. Sukses Abadi is the goal of this study. Quantitativeresearch is a type of this research. The saturated sample is a sampling techniquefor this study. The analysis method used in this research is descriptive analysismethod and simple linear regression analysis were the tests carried out includevalidity, reliability, classical assumption tests (normality test, heteroscedasticitytest), partial test (t-test) and to determine the relationship between each variableusing correlation coefficient analysis. The results of the study explained that thecorrelation value (R) was 0.561. From the output, the coefficient of determination(R Square) is 0.330, which means that the influence of the independent variable(internal control system) on the dependent variable (company performance) is33.00% and the rest is 67.00%. Furthermore, the results of research on theinfluence of internal control systems on company performance at CV Sukses Abadican conclude that there is a significant and positive influence of internal control oncompany performance at CV. Sukses Abadi in Deli Serdang Regency which isshown based on the results of the t value of 2.054> t table of 2.048 and a probabilityvalue of 0.049 <0.05 means that the better internal control carried out by themanagement of CV. Sukses Abadi, the higher the company's performance
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Bai, Yuxing, Fanyu Kong, Fei Zhao, Jiaqiong Wang, Bin Xia, and Qianlan Hu. "Experiments and Numerical Simulation of Performances and Internal Flow for High-Speed Rescue Pump with Variable Speeds." Mathematical Problems in Engineering 2018 (July 2, 2018): 1–18. http://dx.doi.org/10.1155/2018/9168694.
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The model pump is a high-speed, high-power pump designed to achieve rapid mine flooding rescue. This study conducted experiments to investigate pump performance curves, including head, efficiency, and power for the following six different rotation speeds: 3000, 3600, 4200, 4800, 5400, and 6000 rpm. Then, the numerical simulation method based on computational fluid dynamics commercial code Ansys was used to present the internal flow of the pump for the six different rotation speeds through steady and unsteady analyses. Results show that the numerical results agree well with experimental data. The designs of outlet and inlet angles of the impeller match each other well at high rotation speeds. The pressure pulsation coefficient Cp in the impeller and the diffuser channel remain constant at the same monitor point under different rotation speed conditions. The varying trend of the pressure-augmented coefficient ΔP indicates that, with the increase in rotation speed, the effect on pressure rise induced by the back part of the impeller channel is more evident than that by the front part. Also, the main frequency components of ΔP are concentrated on the region with low frequency. Moreover, the rotation speed has no significant effect on ΔP in the diffuser region. This study provides effective guidance and valuable reference for the design of high-speed, high-power pumps.
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Wang, Ziyi, Donghui Ma, Wei Qian, et al. "Detection and Prediction of Internal Damage in the Ancient Timber Structure Based on Optimal Combined Model." Advances in Civil Engineering 2019 (August 14, 2019): 1–18. http://dx.doi.org/10.1155/2019/7108262.
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It is currently known that using stress wave and drilling resistance to detect the internal damage in the ancient timber structure is not a highly precise process. To improve the detection precision of this process, a simulation test was used to detect the internal damage of poplar and elm in ancient buildings. In this empirical study, we compared the detection precision of these two detection methods. Based on the idea of variable weight, we introduced three combined forecasting models based on the IOWA operator, IOWGA operator, and IOWHA operator to predict the internal damage in the ancient timber structure. The results show that the combined forecasting model based on the IOWA operator is more effective in predicting compared to a single detection method and other combined forecasting models. To be more specific, the results show that the detection precision of the combined model is increased by 25.8% and 4.7%, respectively, compared to the precision of the stress wave and drilling resistance tests. The error indicators of the combined forecasting model based on the IOWA operator are better than those of the other combined forecasting models. In addition, the analysis results based upon cross-validation theory show the combined forecasting model based on the IOWA operator has the best applicability, which provides a new practical method for evaluating internal damage of timber components in ancient buildings.
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Siregar, Mulia. "Hubungan Locus of Control Internal Dengan Kematangan Karir Siswa." Journal of Education, Humaniora and Social Sciences (JEHSS) 4, no. 1 (2021): 161–73. http://dx.doi.org/10.34007/jehss.v4i1.604.
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This research aims to study and prove a correlation between internal locus of control and the career maturity to the students of SMKN (State Vocational School) 1 Percut Sei Tuan. The hypothesis in this research is there is a positive correlation between internal locus of control and the career maturity it means the higher of internal locus of control the higher of career maturity. The internal locus of control is measured using I-E scale that arranged by Rotter (1966) and adapted by researcher. The career maturity is measured by CMI that arranged by Crites and adapted into the culture of Indonesia by Taganing, et. al. (2006). This research involves 90 students in Grade XI and XII of SMKN 1 Percut Sei Tuan in Mapping survey and Construction of Concrete department. The sample is taken by total sampling method because the researcher take total population as sample of this research. Based on the results of research it concluded that there is a significant correlation between variable X – Y, with rxy = 0.674; p = 0.000 (p < 0.010) means the hypothesis is accepted. The effective contribution of internal locus of control to the career maturity is 45.5%.
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Pikó, Bettina, Eszter Kovács, and Pálma Kriston. "The significance of the relationship between external/internal locus of control and adolescent substance use in behavioral medicine." Orvosi Hetilap 152, no. 9 (2011): 331–37. http://dx.doi.org/10.1556/oh.2011.29048.
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Prevention and treatment of the addictions are key public health priorities in modern society. In medical practice, in relation to the biochemical processes, mapping the addiction-prone personality traits, like external/internal locus of control are getting more and more attention. Individuals with high level on internal locus of control, for example, tend to take care of their health behavior; the lack of it, on the other hand, may worsen the effectiveness of stress release which may increase the likelihood of turning to substance use. Aims: The main goal of the present study was to investigate the relationship between adolescent substance use (both lifetime prevalence and the actual substance user status) and external/internal locus of control). Method: The data collection of the questionnaire survey was going on among 656 high school students in Szeged (age range between 14-21 years, mean = 16.5 years, S.D. = 1.5 years of age, 49.1% of the sample was female). Associations between indicators of substance use (as dependent variables) and scale points of external/internal locus of control (as independent variables) were assessed using odds ratios calculated by logistic regression analyses, whereas gender was used as a controlling variable. Results: Among boys, scale points of external, among girls, those of internal locus of control showed higher values. External locus of control increased, whereas internal locus of control decreased the risk of substance use, however, the relative role of external/internal locus of control was different according to the type of substance use and the prevalence values. In terms of smoking, lifetime prevalence, whereas in terms of marijuana use, the actual user status was influenced. In addition, while the latter one was also affected by gender, it did not play a role at all in the previous one. Conclusions: All these findings suggest that behavioral control may play a particularly important role in prevention of adolescent substance use. For developing this, methods of cognitive therapy would be effective to be completed with autogenic relaxation training as well. Orv. Hetil., 2011, 152, 331–337.
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Nurrachmah, Sitti. "Pengaruh Komunikasi Internal terhadap Kinerja Pegawai dengan Partisipasi sebagai Variabel Intervening." KOMVERSAL 3, no. 2 (2021): 102–19. http://dx.doi.org/10.38204/komversal.v3i2.723.
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The strategic purpose of communication is related to building a two-way relationship to improve organizational effectiveness, one of the interesting things in effective communication is Internal Communication which has an influence on employee performance. In the behavioral literature, there are a number of aspects of employee attitudes in organizations, including participation and performance. In the context of research, internal communication has an influence on employee performance and participation. The research method used is quantitative, analytical techniques with descriptive statistics that measure the mean, standard deviation, and correlation between variables (zero-order correlation). Statistical testing using path analysis. This study tries to examine the related hypotheses, namely internal communication with participation, internal communication with performance, participation with performance. The results showed that internal communication has a positive influence on participation, internal communication has a positive influence on employee performance, participation has a positive influence on employee performance. The impact of this research is expected that managers can manage internal communication to improve employee performance.
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KHERSIAT, Ola Mohammad. "The Impact of Audit Committees on the Realization of an Integration Relationship between Internal and External Audit when Conducting Audits. A Study on Public Shareholding Corporations." Journal of Advanced Research in Law and Economics 11, no. 2 (2020): 420. http://dx.doi.org/10.14505/jarle.v11.2(48).15.
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This study aims to investigate methods of achieving an integrating relationship between internal and external audit when conducting audit procedures in Jordanian public shareholding corporations, as well as investigate the impact of audit committees achieving such a relationship since an effective internal audit effective the external auditor`s estimations regarding control risks. The study concludes that all aspects of the realization of an integration relation between internal and external audit have achieved a fair ratio exceeding 60%. Spearman test was used to show the nature of the relationship between the internal and external audit. The test results showed that the relationship between these methods is vulnerable in Jordanian public shareholding corporations, and that audit committees have no statistically significant impact on achieving an integrating relationship between internal and external audits in conducting audit in Jordanian public shareholding corporations, since the ratio of audit committees interpretation (R2) which amounted to (.145) of the dependent variable difference ( achieving an integrating relationship between internal and external audit in conducting audit) is relatively low, and that the P- value derived for this relation amounted to (.615) which is more than (5%) .
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Soepriadi, Dewi Nidia, and Theophilia Fina Leiwakabessy. "Efek Moderasi Moralitas Individu terhadap Hubungan Pengendalian Internal dan Kecendrungan Kecurangan." Goodwood Akuntansi dan Auditing Reviu 1, no. 2 (2023): 165–75. http://dx.doi.org/10.35912/gaar.v1i2.2168.
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Purpose: The aim of this research is to examine the moderating effect of individual morality on the relationship between internal control system and the tendency of village financial management fraudulency Methodology/approach: The sampling method was purposive sampling with a total sample of 51 respondents from 20 villages in Ambon City. The data collection technique used was a survey technique using questionnaires. Data analysis used moderated regression analysis Results/findings: The results of the study explained that the internal control system has a negative effect on the tendency of fraudulence and individual morality, which acts as a moderating variable that strengthens the relationship between the internal control system and the tendency of village financial management fraudulency. Limitations: The results of this study indicate that the independent variables internal control system and individual morality as moderating variables only affect the tendency of fraud in village financial management by 30.9%, meaning more than 69.1% are influenced by other factors outside the model. Other factors can be in the form of competence of village officials, as well as compliance with regulations and other behavioral factors that can contribute to the tendency of village financial management fraudulency. Contribution: For the government traditional villages in Ambon City to make the role of state saniri more effective which carries out the supervisory function as the implementation of the internal control function to prevent the occurrence of village financial management that is not in accordance with the rules and can lead to fraud. Novelty: This research was conducted in a village in Ambon City which has the status of a traditional village whose village government system upholds local customs and wisdom so that it is different from other villages based on administrative area.
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Zhu, Li Ming, Fu Dong Yu, and Zheng Hao Zhu. "A Calculation Method Based on Tension Distribution and Temperature Compensation for Sliding Cables." Applied Mechanics and Materials 577 (July 2014): 1162–65. http://dx.doi.org/10.4028/www.scientific.net/amm.577.1162.
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The calculation of sliding cable is difficult because it can dynamically pass through prescribed nodes and the length is variable. In order to solve the above problem, a calculation method based on tension distribution and temperature compensation for sliding cables was put forward. At first, the sliding cable was supposed to be fixed cable and the internal force of each cable segment was calculated. Then, the unbalanced tensions between neighboring cable segments were distributed to make the tensions equal. And then different temperatures were applied to the corresponding cable segments, which could cause temperature stress to compensate the unbalanced tensions between the initial calculated tensions and distributed tensions. At last the calculation was carried on again after applying the temperature to each cable segment. Moreover, an example was presented to verify the precision and validity of this method. The results show that the calculation method based on tension distribution and temperature compensation for sliding cables is effective.
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Polonyi, Janos. "Lectures on the functional renormalization group method." Open Physics 1, no. 1 (2003): 1–71. http://dx.doi.org/10.2478/bf02475552.
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AbstractThese introductory notes are about functional renormalization group equations and some of their applications. It is emphasised that the applicability of this method extends well beyond critical systems, it actually provides us a general purpose algorithm to solve strongly coupled quantum field theories. The renormalization group equation of F. Wegner and A. Houghton is shown to resum the loop-expansion. Another version, due to J. Polchinski, is obtained by the method of collective coordinates and can be used for the resummation of the perturbation series. The genuinely non-perturbative evolution equation is obtained by a manner reminiscent of the Schwinger-Dyson equations. Two variants of this scheme are presented where the scale which determines the order of the successive elimination of the modes is extracted from external and internal spaces. The renormalization of composite operators is discussed briefly as an alternative way to arrive at the renormalization group equation. The scaling laws and fixed points are considered from local and global points of view. Instability induced renormalization and new scaling laws are shown to occur in the symmetry broken phase of the scaler theory. The flattening of the effective potential of a compact variable is demonstrated in case of the sine-Gordon model. Finally, a manifestly gauge invariant evolution equation is given for QED.
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Wang, Qinjun, Jingjing Xie, Jingyi Yang, Peng Liu, Dingkun Chang, and Wentao Xu. "A Model between Cohesion and Its Inter-Controlled Factors of Fine-Grained Sediments in Beichuan Debris Flow, Sichuan Province, China." Sustainability 14, no. 19 (2022): 12832. http://dx.doi.org/10.3390/su141912832.
Full textAbstract:
Cohesion is the attraction between adjacent particles within the same material, which is the main inter-controlled factor of fine-grained sediment stability, and thus plays an important role in debris flow hazard early warning. However, there is no quantitative model of cohesion and its inter-controlled factors, including effective internal friction angle, permeability coefficient and density. Therefore, establishing a quantitative model of cohesion and its inter-controlled factors is of considerable significance in debris flow hazard early warning. Taking Beichuan county in southwestern China as the study area, we carried out a series of experiments on cohesion and its inter-controlled factors. Using the value of cohesion as the dependent variable and values of normalized density, normalized logarithm of permeability coefficient and normalized effective internal friction angle as the independent variables, we established a quantitative model of cohesion and its inter-controlled factors by the least-squares multivariate statistical method. Fitting of the model showed that its determination coefficient (R2) was 0.61, indicating that the corresponding correlation coefficient (R) was 0.78. Furthermore, t-tests of the model showed that except for the p value of density, which was 0.05, those of other factors were less than 0.01, indicating that cohesion was significantly correlated to its inter-controlled factors, providing a scientific basis for debris flow hazard early warning.
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Zhang, Yan Qin, Rui Li, Chun Xi Dai, Jun Peng Shao, Xiao Dong Yang, and Gui Tao Sun. "Research on Hydrostatic Supporting Temperature-Rise of Heavy NC Machine Tool." Applied Mechanics and Materials 274 (January 2013): 132–35. http://dx.doi.org/10.4028/www.scientific.net/amm.274.132.
Full textAbstract:
With heavy NC machine tool is widely used in many oil pad round guide hydrostatic bearing as the research object, in the under condition of variable viscosity, establish oil film viscosity-temperature equation. Adopt finite volume method, simulation the hydrostatic bearing internal fluid temperature field under different flow rates on the speed of 6R / min. Numerical simulation hydrostatic thrust bearing oil film temperature field, can find a general high temperature region, and then take effective control temperature. It can achieve the hydrostatic thrust bearing oil film temperature field prediction for engineering practical oil chamber structure, offer the theoretical foundation for optimization design.
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Bacarreza, Omar, MH Aliabadi, and Alfonso Apicella. "Multi-scale failure analysis of plain-woven composites." Journal of Strain Analysis for Engineering Design 47, no. 6 (2012): 379–88. http://dx.doi.org/10.1177/0309324712448301.
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A numerical model capable of dealing with progressive degradation of plain woven composites in a computationally efficient manner is presented in this article. A semi-analytical homogenization method is used to derive effective properties of the composite from the material properties of the constituents. The progressive failure is described using nonlocal continuum damage mechanics where the driving internal variable for the damage is the nonlocal strain. The model was implemented into Abaqus/Explicit, where the failure of a longitudinal tension and an open hole tension specimens were simulated in a multi-scale manner and verified experimentally.