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Littérature scientifique sur le sujet « Changes to operating properties »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 16 février 2022

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Articles de revues sur le sujet "Changes to operating properties"

Desbarats, Robert P., et Donald G. MacDiarmid. « Independent Operations : Article X of the CAPL Operating Procedure ». Alberta Law Review 34, n^o 3 (1 mai 1996) : 602. http://dx.doi.org/10.29173/alr658.

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This article discusses independent oil and gas operations on jointly held properties, and in particular considers the application of Article X of the Operating Procedures of the Canadian Association of Petroleum Landmen. It explores the rights and obligations of both the party proposing the independent operation and the non-participating party. Recent judicial consideration of some aspects of the operating procedures is discussed. The article suggests some specific changes parties may wish to incorporate when adapting the operating procedure to their circumstances.

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Chen, Chuan Min, Jing Zhang, Li Na Zhu et Song Tao Liu. « Research on the Changes of Physico-Chemical Properties of Lead-Acid Batteries ». Applied Mechanics and Materials 768 (juin 2015) : 197–203. http://dx.doi.org/10.4028/www.scientific.net/amm.768.197.

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Lead-acid batteries were widely used in many industries as important power supply devices for military and civil industries, transport and shipment devices owing to its advantages of low cost,high performance and safety. According to statistics, most lead-acid batteries can reach 1-2 years life under operating conditions, generating millions of used lead-acid batteries each year in China, which caused economic and environmental losses if not properly treated. The changes of physico-chemical properties in the process of operation of lead-acid battery were summarized in this paper. The corrosion and deformation of grids, water loss in electrolyte, aging of separators, corrosion of plates and irreversible sulfation were the main physico-chemical properties changes resulting in battery failure. In the homogeneous acidic medium, the grid of the lead-acid battery corroded away, one side was dotted distribution, and the other side was interlaced net shape. The corrosion of grids and incomplete reaction may lead to the water loss in electrolyte. What’s more, there existed a series of chemical reactions that reducing the battery capacity and leading to the failure of batteries, such as the aging and elastic collision of separators and irreversible sulfation. By analyzing the physico-chemical properties changes in the process of operation, the study supplied the direction for the specification of operating conditions and the extending of service life of lead-acid battery. The basic theories were provided for the repair, regeneration and recovery of lead-acid batteries.

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Packa, Juraj, Vladimir Kujan, Daniel Štrkula, Vladimír Šály et Milan Perný. « Changes of Insulation Properties of Photovoltaic Cables Caused by Ageing Treatment ». TRANSACTIONS ON ELECTRICAL ENGINEERING 6, n^o 1 (30 mars 2020) : 6–9. http://dx.doi.org/10.14311/tee.2017.1.006.

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<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">An important part of the photovoltaic power plants are cable systems. The dielectric properties of cables, reliability and durability depend on quality of production processes, operating conditions and degradation factors, as well. Expected lifetime of cable systems is more than 20-30 years in general. Their failure free operation and long-term stability of properties has a direct impact on the economic return of the investments. According to our experiences the tests in compliance with valid standards are not adequate to verify real life time during operation. Photovoltaic cables intended for use in outdoor applications for the connection between the solar panels and possible connection between panels and inverter were chosen for our experiments. <span style="-ms-layout-grid-mode: line;">The changes </span>of insulation resistance and breakdown voltage caused by some degradation factors, mainly water, are presented. This research was inspired by real failure in operation.</span>

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Nallareddy, Suresh, Mani Sethuraman et Mohan Venkatachalam. « Changes in accrual properties and operating environment : Implications for cash flow predictability ». Journal of Accounting and Economics 69, n^o 2-3 (avril 2020) : 101313. http://dx.doi.org/10.1016/j.jacceco.2020.101313.

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Frankel, Richard M., et Yan Sun. « Predicting Accruals Based on Cash-Flow Properties ». Accounting Review 93, n^o 5 (1 janvier 2018) : 165–86. http://dx.doi.org/10.2308/accr-52001.

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ABSTRACT Our goal is to understand the extent to which cash-flow properties explain accruals. Using the Dechow, Kothari, and Watts (1998) model, we derive a negative relation between accruals and cash-flow changes, and show that the strength of the relation is linked to negative serial correlation in cash-flow changes. Dechow et al. (1998) also suggest that the strength of the relation between accruals and revenue changes relates to operating cycle length. Prior accrual models have not incorporated these theoretical relations. We show that incorporating cash-flow changes, serial correlation in cash-flow changes, and operating cycle length increases explanatory power of all accrual models considered (i.e., Jones 1991; Ball and Shivakumar 2006; McNichols 2002; Jeter and Shivakumar 1999). We find that incorporating these variables in accrual models also improves specification and power, aids detection of earnings management in AAER firms, and produces a nondiscretionary accrual estimate that better predicts future cash flows and earnings. These results suggest the importance of considering the economic role of accruals when predicting accruals.

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Merkisz, Jerzy, Jarosław Markowski, Jarosław Kaluzny et Robert Roszak. « The Numerical Analysis of Influence of Crankshaft Main Spindles Regeneration in Marine Engine on Stiffness and Eigenfrequency of the Crankshaft ». Solid State Phenomena 236 (juillet 2015) : 85–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.85.

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Engine operating conditions of the main propulsion, static in principle with steady-state rotation speed of the crankshaft and engine load, also work under dynamic load conditions. These conditions cause additional distortion of the crankshaft and changes in the operating conditions of the shaft bearings. However, the greatest impact on the long and trouble-free operation has proper engine maintenance. Variable operating conditions and engine operating errors, unfortunately, often cause damage to the main bearings of the crankshaft. Repair of the damaged main bearing spindles of the shaft involves performing the machining of the spindle surface then its re-hardening and selecting new bearing bushings with the appropriate bearing clearance. Trusting the engine manufacturer, there is no check of the influence of the machining of bearing spindles on the structural properties of the shaft. Therefore, the paper presents the model tests of the structure of medium-rev marine engine crankshaft aimed at determining the changes in the mechanical properties of the structure resulting from carrying out the regeneration of the main shaft spindles.

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Hujo, Lubomir, Jozef Nosian, Marcin Zastempowski, Jan Kosiba, Jerzy Kaszkowiak et Matej Michalides. « Laboratory tests of the hydraulic pump operating load with monitoring of changes in the physical properties ». Measurement and Control 54, n^o 3-4 (2 février 2021) : 243–51. http://dx.doi.org/10.1177/0020294020983385.

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The present article deals with the physical properties monitoring of the transmission-hydraulic fluid, and changes of those properties due the operating load of the hydraulic pump in laboratory conditions. Tests of the transmission-hydraulic fluid were performed in laboratory conditions with the simulation of the operating load, so as to simulate the real conditions under which hydraulic circuit of the agricultural tractors operates. The universal transmission-hydraulic fluid was subjected to analysis, where the samples of the fluid were taken sequentially according to the chosen methodology at intervals of 250 and 500 h. The results of the present article include the evaluation of the physical properties of the fluid and the flow efficiency change of the hydraulic pump after 250 and 500 h of operation, while simulating the operation load. Based on a laboratory test, we found that after working for 500 h, the dynamic viscosity of the examined hydraulic fluid at 40°C decreased by 2.92 mPa.s and at 100°C decreased by 0.64 mPa.s. When determining the kinematic viscosity of the hydraulic fluid after working for 500 h, we recorded its decrease, namely, at a temperature of 40°C by a value of 3.37 mm2/s and at a temperature of 100°C, its value decreased by 0.77 mm2/s. In the analysis of the test oil samples, we found that the level of water contamination of the hydraulic fluid decreases with increasing number of hours worked. Specifically, the water concentration in the hydraulic fluid decreased by 0.031%. At the same time, we recorded a slight decrease in the flow efficiency of the hydraulic pump, specifically by a value of 0.03% after 500 h worked. After working 500 h, we found that the range of abrasion particles in the transmission-hydraulic fluid is within the prescribed range, which is determined by the standard D6595-00.

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WOLAK, Artur, Grzegorz ZAJĄC et Magdalena ŻÓŁTY. « Changes of properties of engine oils diluted with diesel oil under real operating conditions ». Combustion Engines 173, n^o 2 (1 mai 2018) : 34–40. http://dx.doi.org/10.19206/ce-2018-206.

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The aim of the article was to analyze changes in the trends of selected physical, chemical and functional properties of lubricating engine oil operating in a diesel-engine vehicle equipped with DPF. The vehicle was operated mainly in urban driving conditions (app. 70%), which impeded the DPF regeneration cycle and caused dilution of oil with unburned fuel. Changes in the following physical and chemical properties were assessed: the DF level in engine oil, viscosity (kinematic, dynamic HTHS and structural CCS), total base num-ber, acid number as well as the degree of oxidation, nitration and sulphonation. The tests have shown that the amount of unburned fuel that goes to the engine crankcase due to the unfinished DPF regeneration cycle is as high as 26.0–34.6%. Dilution of the lubricating oil with fuel leads to a significant reduction of its viscosity – about 30% of the fuel content causes a decrease in the kinematic viscosity measured at 100°C to the level of 7.7 mm2/s. There was also a significant decrease in total base number (TBN) < 2 mg KOH/g, and an increase in the total acid number (TAN). Moreover, the results obtained were analyzed for potential effects that could have been caused during prolonged engine operation by assessing the content of trace elements in the samples taken.

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Смоленцев, В., V. Smolentsev, Сергей Сафонов et Sergey Safonov. « Methods and technologies for surface layer modification in metal products ». Science intensive technologies in mechanical engineering 2, n^o 2 (28 février 2017) : 24–30. http://dx.doi.org/10.12737/24548.

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In the work it is shown that the design of combined technological processes ensuring the maximum possible operating characteristics of products assessed in a criterion way is possible. The science-based methods of choice and use of technologies created earlier, methods for the development of promising coating types, means for the modification of a surface layer and thickness changes of coatings with operating characteristics required are shown. The possibilities are considered for the creation of new methods realizing operating indices the fulfillment of which is impossible at common technologies. The well-known researches have shown that at the operation of science intensive products the mechanical characteristics including fatigue material resistance depend to a great extent upon a state and properties of a surface layer that is why there is offered a substantiated choice and design of technological processes for manufacturing products with properties corresponding most completely to operation conditions.

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Rusin, Andrzej, Adam Wojaczek et Martyna Tomala. « Analysis and management of operating risk created by turbine operation under flexible regimes ». E3S Web of Conferences 137 (2019) : 01026. http://dx.doi.org/10.1051/e3sconf/201913701026.

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The new conditions in which coal-fired power plants, especially 200 MW units, have to operate require a considerable increase in the dynamics of their operation. The power unit start-up frequency increases and so does the frequency of changes in loads. This intensifies some wear processes, such as low- cycle fatigue and crack propagation in particular. Therefore, further operation of power units which have already been in service for a long time has to be supplemented with results of analyses and tests taking account of the intensification of wear processes. The paper presents a proposal for an extension of standard diagnostic testing of turbines by adding small punch tests (SPT) of the rotor material micro specimens. The SPT method enables a fast quasi non-destructive assessment of changes in mechanical properties, especially rotor steel embrittlement due to the turbine previous operation. The other element of the proposed testing is the analysis of the propagation rate of potential cracks in the rotor and assessment of the rotor failure probability for different scenarios of the power unit further operation.

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Thèses sur le sujet "Changes to operating properties"

Prase, Björn. « Characteristics of hydrodynamic plain bearings with bonded coating ». Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21228.

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Increasing ecological and economic pressures, as well as increased technical requirements, have given rise to the need for research into alternative wear layers for hydrodynamic plain bearings. Previous investigations have tested and researched the bonded coating GL92. It has been possible to demonstrate that the bonded coating (plastic base) is a viable alternative to a conventional white metal alloy. However, this coating was not able to address all the issues experienced by industrial users, for example the behaviour of the system (changes to operating properties) during penetration of particles, or behaviour in a mixed friction area. The literature has not – or not sufficiently – answered the questions relating to damage patterns and damage tolerance. Therefore, regardless of the proven benefits, industrial use of this coating is currently not possible or is connected with significant risks. In the study, tests were carried out in the mixed friction area (start-stop testing, emergency testing without oil, insufficient lubrication tests) as well as in the hydrodynamic area. The comparative tests were performed on different wear layer materials. This paper demonstrates and discusses the results for both a conventional white metal alloy bearing and for the bearing with bonded coating (GL92). Depending on the operating point, the bearing systems exhibit significant differences at the maximum bearing load, lubricating film pressure distribution and maximum bearing temperature. The investigation has proven that GL92 is a technically useful alternative to conventional wear layers.

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Chandran, Davannendran. « Experimental investigation into the physico-chemical properties changes of palm biodiesel under common rail diesel engine operation for the elucidation of metal corrosion and elastomer degradation in fuel delivery system ». Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/35228/.

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Compatibility of fuel delivery materials (FDM) with biodiesel fuel in the fuel delivery system (FDS) under real-life common rail diesel engine (CRDE) operation poses a challenge to researchers and engine manufacturers alike. Although standard methods such as ASTM G31 and ASTM D471 for metals and elastomers, respectively, are deemed suitable for evaluating the effects of water content, total acid number (TAN) and oxidation products in biodiesel on FDM degradation, they do not resemble the actual engine operation conditions such as varying fuel pressure/temperature as well as the presence of a wide range of materials in the FDS of a diesel engine. Hence, the current allowable maximum 20 vol% of biodiesel with 80 vol% of diesel (B20) for use in diesel engines to date is debatable. Additionally, biodiesel utilization beyond B20 is essential to combat declining air quality and to reduce the dependence on fuel imports. This thesis aims to elucidate the actual compatibility present between FDM and biodiesel in the FDS under real-life CRDE operation. This was achieved through multi-faceted experimentations which commenced with analyses on the deteriorated palm biodiesel samples collected during and after CRDE operation. Next, the fuel properties which should be emphasized based on the deteriorated fuel were determined. This was then followed by ascertaining the effects of the emphasized fuel properties towards FDM degradation. Ultimately, the actual compatibility of FDM with biodiesel under engine operation through modified immersion investigations was determined. FDM degradation acceleration factors such as oxidized biodiesel, TAN and water content were eliminated since these factors were not affected based on the analysed fuel samples collected after engine operation. No oxidation products such as aldehydes, ketones and carboxylic acids were detected while the TAN and water content were within 0.446% and 0.625% of their initial values, respectively. Instead, the biodiesel’s dissolved oxygen (DO) concentration and conductivity value were not only found to have changed during and after engine operation by -93% and 293%, respectively, but were also found to have influenced biodiesel deterioration under engine operation. These two properties were subsequently discovered to have adversely affected FDM degradation independently. The copper corrosion rate and nitrile rubber (NBR) volume change increased by 9% and 13%, respectively, due to 22% increase in the conductivity value. In contrast, the copper corrosion rate and NBR volume swelling reduced by 91% and 27%, respectively, due to 96% reduction in the DO concentration. Ultimately, copper corrosion and NBR degradation were determined to be lowered by up to 92% and 73%, respectively, under modified immersion as compared to typical immersion condition. These outcomes distinctly show that acceptable to good compatibility is present between FDM and biodiesel under CRDE operation. The good compatibility is strongly supported since only a maximum lifespan reduction of 1.5 years is predicted for metal exposed to biodiesel as compared to diesel for a typical component lifespan of 15 years. For the elastomers, acceptable compatibility is found present between elastomer and biodiesel based on the determined 11% volume change which conforms to the tolerance level of elastomer degradation as stated by the elastomer manufacturers. These are especially true for the evaluated metals and elastomers investigated under the modified laboratory immersion which replicates similar conditions to a real-life CRDE. Overall, this work has contributed to the advancement of knowledge and application of biodiesel use in diesel engines.

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Park, Han-Up. « Changes in Operating Margins During a Sales Decline and Abnormal Returns ». Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/464964.

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Business Administration/Accounting
Ph.D.
I examine the implications of changes in operating profit margins during a sales decline for future earnings and abnormal stock returns. When sales decrease, managers decide whether to cut slack resources. Managers who are optimistic about their future operations often retain slack resources in anticipation of resurging sales, thereby decreasing concurrent profitability. Conversely, managers who are pessimistic about their future operations typically reduce slack resources to gain efficiency, thereby increasing concurrent profitability. I find that analysts and investors persistently underestimate the future profitability of firms that exhibit a large decrease in current profitability. I also find that subsequent quarterly earnings announcements gradually reveal future profitability, resulting in concentrated positive abnormal returns in short pre-announcement windows for about a year after a sales decline. These results suggest that analysts and investors have difficulties evaluating managers’ resource adjustment decisions when a large decrease in concurrent profitability can indicate managers’ optimistic expectations.
Temple University--Theses

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Leimalm, Ulrika. « Pellet reduction properties under different blast furnace operating conditions ». Licentiate thesis, Luleå : Luleå tekniska universitet/Tillämpad kemi och geovetenskapProcessmetallurgi, 2006. http://epubl.ltu.se/1402-1757/2006/67/LTU-LIC-0667-SE.pdf.

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Chan, Chee-Wan. « Effects of powered harrow operating parameters on soil physical properties ». Connect to resource, 1992. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1200585211.

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Boström, Patrik. « Revisiting Observed Changes in Cloud Properties over Europe ». Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179997.

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The Earth’s atmosphere is a vulnerable system which is easily changed by micro- and macrophysical variations. Big decreases in pollution levels of sulfur dioxide over Central Europe from 1980s to 2000s led to decreased mass concentration of atmospheric solid and liquid particles. This gives the opportunity to investigate how these particles influence the atmosphere. Newly released satellite climatology data was used to analyze statistics of cloud properties during four years in the high polluted atmosphere (1985-88) and four years in the less polluted atmosphere (2004-07). These two periods were investigated in collaboration with Atmospheric Remote Sensing Unit of the research department of the Swedish Meteorological and Hydrological Institute (SMHI). Cloud top temperature of liquid clouds over polluted regions during the earlier period was colder by more than 2 K and more than 5 K for only optical thin liquid clouds. The changes in mass concentrations of atmospheric particles derived by the sulfur dioxide emissions are shown to be a highly possible factor to the observed cloud changes.
Jordens atmosfär är ett känsligt system som lätt förändras av mikro- samt makrofysikaliska variationer. Stora minskningar i föroreningsnivåer av svaveldioxid över centrala Europa från 1980 till 2000-talet ledde till minskade masskoncentrationer av fasta och flytande atmosfäriska partiklar. Detta ger en möjlighet att undersöka hur dessa partiklar påverkar atmosfären. Nyligen utvecklad klimatologisk satellitdata användes för att analysera statistik av molnegenskaper under fyra år i en högt förorenad atmosfär (1985-88) och fyra år i en mindre förorenad atmosfär (2004-07). De två perioderna undersöktes i samarbete med Enheten för atmosfärisk fjärranalys av forskningsavdelningen till Sveriges meteorologiska och hydrologiska institut (SMHI). Molntopptemperaturen för moln i vätskefas över förorenande områden under den tidigare perioden var mer än 2 K kallare och mer än 5 K kallare för endast optiskt tunna moln i vätskefas. Förändringarna i masskoncentrationer för atmosfäriska partiklar och droppar med svaveldioxidusläpp som ursprung visas vara högst möjliga att ligga bakom de observerade molnförändringarna.

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Owe-Larsson, Björn. « Changes in neuronal properties induced by neurotropic infections / ». Stockholm, 2000. http://diss.kib.ki.se/2000/91-628-4300-1/.

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Kilborn, Michael John. « Postnatal changes in electrophysiological properties of rat cardiomyocytes ». Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292673.

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Belova, Olesya, Fatima Jamil et Chiara Troncatti. « POST ENTRY CHANGES : A case study of large Italian MNCs operating in BRIC markets ». Thesis, Uppsala University, Department of Business Studies, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-126772.

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In this paper we aim to identify the most important factors that influence the decisions made by large Western MNCs concerning post entry changes (PEC) in the BRIC markets. Thiss tudy attempts to explain processes and reasons why these changes take place. In addition we make a comparison between strategies followed and the differences between them for each of the BRIC markets.Most academic literature focuses on entry mode theories, however little has been written onPEC. PEC today is a hot topic in the current international business environment. This isevident in the market as many Western MNCs that invested in emerging markets throughJoint Ventures (JV) during the late 1980s and 1990s are now restructuring their strategies in order to further their growth (Luo, 2007).The paper uses a qualitative study to explain and explore PEC strategies in each of the four BRIC markets, using case studies of three Italian large MNCs: Artsana, De Longhi and Luxottica.The study finds that firstly BRIC markets should not be seen as a whole, as academic literature has a tendency to suggest. Secondly, the study finds that country-specific conditions directly affect PEC choices and decisions differently in each market. We have identified a number of variables which influence PEC, of these economic conditions and institutional context pressures were found to be the most important determinants for PEC within the MNCs studied. This study will help management to better choose appropriate PEC and set the most suitable operational mode for each specific environment.

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Holland, Jonathan Eddison. « Changes in soil physical properties under raised bed cropping / ». Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00002537.

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Livres sur le sujet "Changes to operating properties"

Changes in matter. Orlando, Fl : Harcourt School Publishers, 2004.

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Carolyn, Reeves, dir. Elementary chemistry : Matter : its properties & its changes. Green Forest, AR : Master Books, 2009.

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Look how it changes. New York : Children's Press, 2006.

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Shawley, Gregory A. Factors influencing changes in operating & maintenance costs, and operating & maintenance performance of Pennsylvania's electric utilities. [Harrisburg] : Pennsylvania Public Utility Commission, Bureau of Conservation, Economics, and Energy Planning, 1991.

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Kneeshaw, J. T. Changes in central bank money market operating procedures in the 1980s. Basle : Bank for International Settlements, Monetary and Economic Dept., 1989.

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Trujić, Vlastimir. Magnetite pellets : Kinetics of reduction, phase changes and properties : monograph. Bor : Mining and Metallurgy Institute, 2010.

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Sampson, George Roger. Temperature changes in an initially frozen wood chip pile. Portland, Or : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1987.

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Roger, Brown. Natural ageing of rubber : Changes in physical properties over 40 years. Shrewsbury : Rapra Technology, 2000.

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Geimer, Robert L. Response of flakeboard properties to changes in steam injection pressing environments. Madison, WI (One Gifford Pinchot Dr., Madison 53705-2398) : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1992.

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Pelleg, Joshua. Mechanical Properties of Materials. Dordrecht : Springer Netherlands, 2013.

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Chapitres de livres sur le sujet "Changes to operating properties"

Piant, A., M. Fritz, M. Boussuge et M. D. Dupuits. « Changes in the Physical and Mechanical Properties of SiC Trays Caused by Ageing in Zinc Refinery Operations ». Dans Lead-Zinc 2000, 511–20. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118805558.ch33.

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Nulsen, R. A. « Changes in Soil Properties ». Dans Reintegrating Fragmented Landscapes, 107–45. New York, NY : Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4613-9214-9_5.

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Abashidze, G. S., Fernand D. S. Marquis et N. M. Chikhradze. « Basalt Reinforced Plastics : Some Operating Properties ». Dans Materials Science Forum, 671–74. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.671.

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Kern-Isberner, Gabriele, Tanja Bock, Kai Sauerwald et Christoph Beierle. « Belief Change Properties of Forgetting Operations over Ranking Functions ». Dans PRICAI 2019 : Trends in Artificial Intelligence, 459–72. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29908-8_37.

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Stoskuviene, Akvile. « Evaluation of Glaucomatous Structural Changes ». Dans Biophysical Properties in Glaucoma, 79–88. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-98198-7_12.

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Bertenshaw, Kirsty. « Properties and changes of materials ». Dans Tried and Tested Primary Science Experiments, 88–98. Abingdon, Oxon ; New York, NY : Routledge, 2019. : Routledge, 2019. http://dx.doi.org/10.4324/9780429454936-21.

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Espinoza, Fernando. « Changes in Properties of Waves ». Dans Wave Motion as Inquiry, 149–66. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45758-1_8.

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Barton, Jennifer K. « Dynamic Changes in Optical Properties ». Dans Optical-Thermal Response of Laser-Irradiated Tissue, 321–49. Dordrecht : Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8831-4_9.

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Kajzer, Anita, Monika Lewczuk, Marcin Kaczmarek et Wojciech Kajzer. « Study of Operating Properties of Surgical Tools ». Dans Innovations in Biomedical Engineering, 269–77. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15472-1_29.

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Forbes, R. G. « Physical properties of the noble operating gases ». Dans Physics of Solid Surfaces, 656–57. Berlin, Heidelberg : Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_162.

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Actes de conférences sur le sujet "Changes to operating properties"

Verma, Atul, et Ranga Pitchumani. « Effect of Membrane Properties on Dynamic Behavior of Polymer Electrolyte Membrane Fuel Cells ». Dans ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fuelcell2013-18209.

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Understanding the performance of proton exchange membrane (PEM) fuel cells is critical to the water management in the fuel cell system. Low-humidity operating conditions present a complex interaction between dynamic behavior and water transport owing to different time scales of water transport mechanisms in the transient process. Toward understanding the effects of membrane properties on the dynamic behavior, this paper presents numerical simulations for a single channel PEM fuel cell undergoing changes in load, by subjecting the unit cell to step change in current. The objective is to elucidate the complex interaction between cell voltage response and water transport dynamics for various membrane properties, where the performance is critically related water content of the membrane. Detailed computational fluid dynamics (CFD) simulations are carried out to show that step increase in current density leads to anode dryout due to electro-osmotic drag, and investigate its dependence on variations in membrane properties.

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Fujii, Tomoharu, et Takeshi Takahashi. « Development of Operating Temperature Prediction Method Using Thermophysical Properties Change of TBC ». Dans ASME Turbo Expo 2002 : Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30274.

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Thermal barrier coatings (TBCs) have become an indispensable technology as the temperature of turbine inlet gas has increased. TBCs reduce the temperature of the base metal, but a reduction of internal pores by sintering occurs when using TBCs, and so the thermal barrier performance of TBCs is deteriorated. This in turn increases the temperature of the base metal and could shorten its lifespan. The authors have already clarified by laboratory acceleration tests that the deterioration of the thermal barrier performance of TBCs is caused by a decrease in the non-contact area that exists inside TBCs [1]. This non-contact area is a slit space that exists between thin layers and is formed when TBCs are coated. This paper examines the relations between the decrease of the non-contact area and the exposure conditions, by measuring the thermal conductivity and the porosity of TBCs exposed to the temperatures that exist in an actual gas turbine, and derives the correlation with exposure conditions. As a result, very high correlations were found between the thermal conductivity and exposure conditions of TBCs, and between the porosity and exposure conditions. A very high correlation was also found between the thermal conductivity and porosity of TBCs. In addition, techniques for predicting TBC operating temperature were examined by using these three correlations. The correlation of diameter and exposure conditions of the gamma prime phase, which exists in nickel base super alloys, is used as a general method for predicting the temperature of parts in hot gas paths [2]. This paper proposes two kinds of operating temperature prediction methods, which are similar to this general method. The first predicts the operating temperature from thermal conductivity measurements of TBCs before and after use, and the second predicts the operating temperature from thermal conductivity measurements of TBCs after use and porosity measurements before use. The TBC operating temperatures of a combustor that had been used for 12,000 hours with an actual E-class gas turbine were predicted by these two methods. The advantage of these methods is that the temperature of all parts with TBC can be predicted.

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Albrecht, Kevin J., Matthew L. Bauer et Clifford K. Ho. « Parametric Analysis of Particle CSP System Performance and Cost to Intrinsic Particle Properties and Operating Conditions ». Dans ASME 2019 13th International Conference on Energy Sustainability collocated with the ASME 2019 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/es2019-3893.

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Abstract The use of solid particles as a heat-transfer fluid and thermal storage media for concentrating solar power is a promising candidate for meeting levelized cost of electricity (LCOE) targets for next-generation CSP concepts. Meeting these cost targets for a given system concept will require optimization of the particle heat-transfer fluid with simultaneous consideration of all system components and operating conditions. This paper explores the trade-offs in system operating conditions and particle thermophysical properties on the levelized cost of electricity through parametric analysis. A steady-state modeling methodology for design point simulations dispatched against typical meteorological year (TMY) data is presented, which includes computationally efficient submodels of a falling particle receiver, moving packed-bed heat exchanger, storage bin, particle lift, and recompression supercritical CO2 (sCO2) cycle. The components selected for the baseline system configuration presents the most near-term realization of a particle-based CSP system that has been developed to date. However, the methodology could be extended to consider alternative particle receiver and heat exchanger concepts. The detailed system-level model coupled to component cost models is capable of propagating component design and performance information directly into the plant performance and economics. The system-level model is used to investigate how the levelized cost of electricity varies with changes in particle absorptivity, hot storage bin temperature, heat exchanger approach temperature, and sCO2 cycle operating parameters. Trade-offs in system capital cost and solar-to-electric efficiency due to changes in the size of the heliostat field, storage bins, primary heat exchanger, and receiver efficiency are observed. Optimal system operating conditions are reported, which approach levelized costs of electricity of $0.06 kWe−1hr−1.

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Weaver, Brian K., Jason A. Kaplan, Andres F. Clarens et Alexandrina Untaroiu. « Transient Analysis of Gas-Expanded Lubrication and Rotordynamic Performance in a Centrifugal Compressor ». Dans ASME Turbo Expo 2015 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43547.

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Gas-expanded lubricants (GELs) have the potential to increase bearing energy efficiency, long-term reliability, and provide for a degree of control over the rotordynamics of high-speed rotating machines. Previous work has shown that these tunable mixtures of synthetic oil and dissolved carbon dioxide could be used to maximize the stability margin of a machine during startup by controlling bearing stiffness and damping. This allows the user to then modify the fluid properties after reaching a steady operating speed to minimize bearing power loss and reduce operating temperatures. However, it is unknown how a typical machine would respond to rapid changes in bearing stiffness and damping due to changes in the fluid properties once the machine has completed startup. In this work, the time-transient behavior of a high-speed compressor was evaluated numerically to examine the effects of rapidly changing bearing dynamics on rotordynamic performance. Two cases were evaluated for an 8-stage centrifugal compressor: an assessment under stable operating conditions as well as a study of the instability threshold. These case studies presented two contrasting sets of transient operating conditions to evaluate, the first being critical to the viability of using GELs in high-speed rotating machinery. The fluid transitions studied for machine performance were between that of a polyol ester synthetic lubricant and a GEL with a 20% carbon dioxide content. The performance simulations were carried out using a steady-state thermoelastohydrodynamic (TEHD) bearing model, which provided bearing stiffness and damping coefficients as inputs to a time-transient rotordynamic model using Timoshenko beam finite elements. The displacements and velocities of each node were solved for using a fourth order Runge-Kutta method and provided information on the response of the rotating machine due to rapid changes in bearing stiffness and damping coefficients. These changes were assumed to be rapid due to 1) the short lubricant residence times calculated for the bearings, and 2) rapid mixing due to high shear rates in the machine bearings causing sudden changes in the fluid properties. This operating condition was also considered to be a worst-case scenario as an abrupt change in the bearing dynamics would likely solicit a more extreme rotordynamic response than a more gradual change, making this analysis quite important. The results of this study provide critical insight into the nature of operating a rotating machine and controlling its behavior using gas-expanded lubricants, which will be vital to the implementation of this technology.

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Owejan, J. P., T. A. Trabold, D. L. Jacobson, M. Arif et S. G. Kandlikar. « Effects of Flow Field and Diffusion Layer Properties on Water Accumulation in a PEM Fuel Cell ». Dans ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2007. http://dx.doi.org/10.1115/icnmm2007-30142.

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Water is the main product of the electrochemical reaction in a proton exchange membrane (PEM) fuel cell. Where the water is produced over the active area of the cell, and how it accumulates within the flow fields and gas diffusion layers, strongly affects the performance of the device and influences operational considerations such as freeze and durability. In this work, the neutron radiography method was used to obtain two-dimensional distributions of liquid water in operating 50 cm2 fuel cells. Variations were made of flow field channel and diffusion media properties, to assess the effects on the overall volume and spatial distribution of accumulated water. Flow field channels with hydrophobic coating retain more water, but the distribution of a greater number of smaller slugs in the channel area improves fuel cell performance at high current density. Channels with triangular geometry retain less water than rectangular channels of the same cross-sectional area, and the water is mostly trapped in the two corners adjacent to the diffusion media. Also, it was found that cells constructed using diffusion media with lower in-plane gas permeability tended to retain less water. In some cases, large differences in fuel cell performance were observed with very small changes in accumulated water volume, suggesting that flooding within the electrode layer or at the electrode-diffusion media interface is the primary cause of the significant mass transport voltage loss.

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Krhač Andrašec, Eva, Tomaž Kern, Matjaž Roblek et Benjamin Urh. « Analiza uporabe metod in tehnik izboljševanja poslovnih procesov ». Dans Values, Competencies and Changes in Organizations. University of Maribor Press, 2021. http://dx.doi.org/10.18690/978-961-286-442-2.35.

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Over 50 approaches, methods, and techniques have been developed in recent decades to achieve more efficient business systems operations. Due to the increasingly rapid changes in the business and social environment, the question of which method or technique will have the most significant impact on increasing its competitive advantage is becoming increasingly important. In the presented research, due to the scope of the issue, we focused on an overview of the most often used methods and techniques and their similarity. For this purpose, we prepared an overview of the frequency of particular methods and techniques in the sources collected in multidisciplinary databases. We were also interested in which phases of business process improvement a particular method or technique is used. Based on the knowledge gained in this way, we designed a set of appropriate methods and techniques for improving business processes. The performed research can serve as a starting point for solving this problem. It would be necessary for its integrity to check other properties of methods and techniques and their practice efficiency.

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Chepusov, A. S., A. A. Komarskiy, S. R. Korzhenevskiy et O. D. Krasniy. « Study of field electron emission properties of commercial graphite cathodes in pulse-repetitive mode ». Dans VIII Information school of a young scientist. Central Scientific Library of the Urals Branch of the Russian Academy of Sciences, 2020. http://dx.doi.org/10.32460/ishmu-2020-8-0007.

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The article considers field emission cathodes from industrial graphites MG, MPG-7, and GMZ operated in the pulse-periodic mode with the pulse repetitionrate of 1 to 30 Hz. The operation of field emitters in the pulsed mode differs from operation at a constant voltage. Under stabilization of the high potential level, the amplitude of the pulses of the emission current decreases that leads to increasing the operating voltage in the pulsed mode. During operation of the graphite cathode (when the pulse current is recorded), the operating voltage at the anode stabilizes and oscillates within 5%. Operation in the direct current mode under similar conditions is accompanied by a change in the voltage value by more than 10 %.

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Jouvin, Juan Carlos, Jeffrey Samuel et Igor Pioro. « Analysis of Thermophysical Properties for Selected Supercritical Fluids ». Dans 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30146.

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Currently, there are six Generation IV reactor systems under development worldwide: 1) Very-High-Temperature Reactor (VHTR); 2) Sodium-cooled Fast Reactor (SFR); 3) SuperCritical Water-cooled Reactor (SCWR), 4) Gas-cooled Fast Reactor (GFR), 5) Lead-cooled Fast Reactor (LFR); and 6) Molten Salt Reactor (MSR). Of these six systems, Canada has decided to pursue the SCWR as its choice for a Generation IV reactor, with some research being conducted on the VHTR. One main objective of SCWRs is to increase the thermal efficiency of current nuclear power plants from the 30–35% range to approximately 45–50%. In order to accomplish this, SCWRs are being designed to operate well above the critical point of water at pressures of 25 MPa and reactor outlet temperatures up to 625°C. These operating conditions also make the SCWR, along with the VHTR and other Generation IV systems, suitable candidates to support thermochemical hydrogen cogeneration. The design and operation of a facility capable of accurately and safely conducting experiments in supercritical water is a very expensive task. In order to facilitate our understanding of supercritical heat-transfer phenomena, modeling fluids such as carbon dioxide, refrigerants, ammonia and helium can be used to complement our knowledge of supercritical fluids. Some of these fluids, namely helium and carbon dioxide, have also been considered as potential working fluids in some special designs of reactors and power cycles. The objective of this paper is to investigate the feasibility of using alternative working fluids such as helium and Refrigerant-134a (R-134a) by comparing the fluid and transport properties with those of water. Operating conditions of SCWRs are scaled into those of the modeling fluid, R-134a, in order to provide proper SCWR-equivalent conditions. The equivalent properties for helium, which is one possible coolant for the VHTR, are also discussed. The thermophysical properties for selected working fluids are obtained from NIST REFPROP software. The results indicate that the thermophysical properties of the fluids undergo significant changes within the critical and pseudocritical regions similar to that of supercritical water. A sensitivity analysis for the effect of temperature on selected thermophysical properties at various supercritical pressures was performed.

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Borges Rodriguez, Antonio, Vishal Dantal, Victor Bjorn Smith et Roselyn Carroll. « Soil Characterisation for Installing and Operating Deep-Water Pipelines ». Dans ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54838.

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Deep-water developments rely on pipeline and riser systems to transfer hydrocarbon products to floating facilities or potentially longer tie-back pipelines to shallow water platforms/onshore facilities. Depending on the nature of the product and operational conditions, the pipeline and riser system design may need to consider a range of dynamic processes during operation such as (i) controlled lateral buckling of the pipeline in order to relieve excessive constrained axial forces induced by temperature and pressure changes in the system; (ii) the accumulation of pipeline axial displacement or ‘walking’; and (iii) evolution of the pipe-soil interaction at the riser seabed touchdown point due to the dynamic behaviour of the riser. Under these conditions, the reliable structural assessment of the pipeline system relies upon accurate assessment of the pipeline-soil interaction (PSI), from the initial lay embedment of the pipeline to the evolution of the lateral and axial response over the lifetime of the facilities. Accurate assessment of these PSI parameters requires adequate characterisation of the seabed topography, seabed processes (e.g. geohazards) and the soil properties. This paper proposes ways for efficient planning of the geophysical and geotechnical site investigation activities and subsequent soil element and physical model testing for the assessment of relevant PSI parameters in deep-water.

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Teng, Geng, Laijie Chen, Xin Shen, Hua Ouyang, Yubo Zhu, Wei Fan et Zhigang Liu. « Preliminarily Design of Supercritical CO2 Compression Test System ». Dans ASME Turbo Expo 2021 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59228.

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Abstract The centrifugal compressor is the core component of the supercritical carbon dioxide (SCO2) power cycle. It is essential to carry out component-level experimental research on it and test the working characteristics of the compressor and its auxiliary equipment. Building an accurate closed-loop simulation model of closed SCO2 compression loop is a necessary preparation for selecting loop key parameters and establishing system control strategy, which is also an important prerequisite for the stable operation of compressor under test parameters. In this paper, the thermodynamic model of compressor, pre-cooler, orifice plate and other components in supercritical CO2 compression test system is studied, and the simulation model of compression test system is established. Moreover, based on the system enthalpy equations and physical property model of real gas, the compressor, pre-cooler and other components in the test loop are preliminarily designed by using the thermodynamic model of components. Since the operating conditions are in the vicinity of the critical point, when the operating conditions change slightly, the physical properties of the working fluid will change significantly, which might have a greater impact on the operating performance of the system. So the operating performance and the parameter changes of key nodes in the test loop under different operating conditions are calculated, which will provide theoretical guidance for the construction of subsequent experimental loops.

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Rapports d'organisations sur le sujet "Changes to operating properties"

Kelly, B. T. Analysis of the Changes in Graphite Properties Under Neutron Irradiation Due to Structural Changes. Office of Scientific and Technical Information (OSTI), mai 1993. http://dx.doi.org/10.2172/1366723.

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Qian, Y., D. Ila, K. X. He, M. Curley, D. B. Poker et L. A. Boatner. Ion beam-induced changes in optical properties of MgO. Office of Scientific and Technical Information (OSTI), décembre 1995. http://dx.doi.org/10.2172/219356.

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Contessi, Silvio, Pierangelo De Pace et Johanna L. Francis. Changes in the Second-Moment Properties of Disaggregated Capital Flows. Federal Reserve Bank of St. Louis, 2010. http://dx.doi.org/10.20955/wp.2010.020.

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Ogren, John A., Patrick S. Sheridan et Elisabeth Andrews. Cloud-Driven Changes in Aerosol Optical Properties - Final Technical Report. Office of Scientific and Technical Information (OSTI), septembre 2007. http://dx.doi.org/10.2172/917185.

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Horwath, John, Zafer Turgut et Richard Fingers. High Temperature Properties and Aging-Stress Related Changes of FeCo Materials. Fort Belvoir, VA : Defense Technical Information Center, juillet 2006. http://dx.doi.org/10.21236/ada460527.

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Mark O. McLinden, Arno Laesecke, Eric W. Lemmon, Joseph W. Magee et Richard A. Perkins. Properties and Cycle Performance of Refrigerant Blends Operating Near and Above the Refrigerant Critical Point, Task 1 : Refrigerant Properties. Office of Scientific and Technical Information (OSTI), août 2002. http://dx.doi.org/10.2172/808634.

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Henninges, J., J. Schrötter, K. Erbas et E. Huenges. Temperature field of the Mallik gas hydrate occurrence - implications on phase changes and thermal properties. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220890.

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Evans, James W., Jane K. Evans et David W. Green. Computer programs for adjusting the mechanical properties of 2-inch dimension lumber for changes in moisture content. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1990. http://dx.doi.org/10.2737/fpl-gtr-63.

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Shakofsky, S. Changes in soil hydraulic properties caused by construction of a simulated waste trench at the Idaho National Engineering Laboratory, Idaho. Office of Scientific and Technical Information (OSTI), mars 1995. http://dx.doi.org/10.2172/130647.

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McDowell, S. D. Geothermal alteration of sediments in the Salton Sea scientific drill hole : Petrophysical properties and mass changes during alteration : Final report. Office of Scientific and Technical Information (OSTI), décembre 1987. http://dx.doi.org/10.2172/5434885.

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