Temat: comprehensive performance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Flow and heat transfer characteristics of a novel airfoil-based tube with dimples
Autorzy:: Pei, Houju
Liu, Meinan
Yang, Kaijie
Zhimao, Li
Liu, Chao
Powiązania:: https://bibliotekanauki.pl/articles/2173696.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: heat transfer enhancement
airfoil-based tube
dimple
comprehensive performance
wzmocnienie wymiany ciepła
rura
wgłębienie
wykonanie kompleksowe
Opis:: The performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and 21,736. The velocity contour, temperature contour, and local streamlines are also presented to get an insight into the heat transfer enhancement mechanisms. The results show that both the velocity magnitude and flow direction change, and fluid dynamic vortexes are generated around the dimples, which intensify the flow mixing and interrupt the boundary layer, resulting in a better heat transfer performance accompanied by a certain pressure loss compared with the plain tube. The Nusselt number Nu of the airfoil-based tube increases with the increase of dimples number, relative depth, and Reynolds numbers, but the effect of cross-distribution angle can be ignored. Under geometric parameters considered, the airfoil-based tube with N = 6, H/D = 0.1, α = 0° and Re = 7,753 can obtain the largest average PEC value 1.23. Further, the empirical formulas for Nusselt number Nu and friction factor f are fitted in terms of dimple number N, relative depth H/D, and Reynolds number Re, respectively, with the errors within ± 5%. It is found that the airfoil-based tube with dimples has a good comprehensive performance.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141984
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A comprehensive cycloid pin-wheel precision reducer test platform integrated with a new dynamic measurement method of lost motion
Autorzy:: Yue, Huijun
Wu, Xiangkai
Shi, Zhaoyao
Zhang, Yue
Ye, Yong
Zhang, Lintao
Fu, Ying
Powiązania:: https://bibliotekanauki.pl/articles/2052087.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cycloid pin-wheel precision reducer
RV reducer
test platform
comprehensive performance
dynamic measurement of lost motion
decomposition test method
Opis:: While cycloid pin-wheel precision reducers (referred to as RV reducers) are widely used in industrial robots, a widely accepted design standard or verification method of their test platforms is not available. In this study, a comprehensive sliding-separation test platform of RV reducers was developed. The test platform can test various measurement items such as transmission error, static measurement of lost motion, dynamic measurement of lost motion, torsional rigidity, no-load running torque, starting torque, backdriving torque, and transmission efficiency of the RV reducer for robots. The principle and method of dynamic measurement of lost motion tests based on the two-way transmission error method were studied and this test function was successfully integrated with the comprehensive test platform in order to increase the test items of the dynamic performance parameters of RV reducers. The measurement results of the no-load running torque of the RV reducer were consistent with the Stribeck curve. Based on the concept of optimal measurement speed, a decomposition test method of the geometric component of the dynamic measurement of lost motion and the elastic component of the dynamic measurement of lost motion was proposed in the dynamic measurement test of lost motion. Through precision calibration, function test and repeatability test, the results were compared with the data of enterprise’s samples. The consistent results have proved that the test platform met engineering requirements and measurement accuracy requirements. Based on the new test principle, the developed platform can test more parameters of RV reducers with high precision and display the comprehensive test performance.
Źródło:: Metrology and Measurement Systems; 2022, 29, 1; 207-229
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Executive compensation and comprehensive income: evidence from Polish listed companies
Autorzy:: Sajnóg, Artur Robert
Powiązania:: https://bibliotekanauki.pl/articles/19090961.pdf
Data publikacji:: 2019
Wydawca:: Instytut Badań Gospodarczych
Tematy:: executive compensation
comprehensive income
profitability ratios
firm performance
corporate governance
Opis:: Research background: The literature of Economics presents the agency problem, which can be mitigated through executive compensation, especially when it is connected with company profits. This relationship has been repeatedly analysed in the corporate governance literature, which shows both positive and negative correlations between these categories. Thus, another approach is presented with comprehensive income, which (in contrast to net income) is generally beyond the control of managers and hinders active earnings management. Purpose of the article: This article presents the evaluation of three stages of the relationship between executive compensation and profitability ratios (RoS, RoA, RoE), which are based on comprehensive income and net income. The main research hypothesis states that in economic practice, it can be assumed that there is a stronger positive correlation between executive compensation and comprehensive income than net income. Methods: The research covered companies listed on the WSE from the industry sector (between 2009 and 2017). The first part of the paper contains the results of correlations between profitability ratios and executive compensation (conducted by means of Pearson?s correlation coefficient). The second part presents the results of three regression models in two versions ? the influence that RoS, RoA and RoE have on companies? executive compensation, based on comprehensive income and net income. Findings & Value added: The analysed companies were characterised by a diversity correlation between the executive compensation and profitability ratios calculated with net profit and comprehensive income. Nevertheless, it must be stressed that the results of the estimation show, in this case, the slightly greater role of comprehensive income than net profit. One can emphasise a certain advantage of comprehensive income over net profit, as the former can inhibit the effects of managers' intentional influence on the value of the reported earnings.
Źródło:: Oeconomia Copernicana; 2019, 10, 3; 493-509
2083-1277
Pojawia się w:: Oeconomia Copernicana
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Executive compensation and the financial performance of Polish listed companies from the corporate governance perspective
Autorzy:: Sajnóg, Artur
Rogozińska-Pawełczyk, Anna
Powiązania:: https://bibliotekanauki.pl/articles/22443163.pdf
Data publikacji:: 2022
Wydawca:: Instytut Badań Gospodarczych
Tematy:: executive compensation
corporate governance
financial performance
comprehensive income
Polish listed companies
Opis:: Research background: The level of compensation earned by CEOs and the relationship between executive pay and companies? performance is one of the most widely studied issues in the corporate governance literature. Studies conducted in the last several decades have provided evidence that CEO pay should be aligned with accounting financial measures. Purpose of the article: The main purpose of this paper is to determine the relationship between executive compensation and organizational financial performance. In particular, the effect of net income and comprehensive income as the accounting measures of financial performance on executive compensation is compared. Methods: The research comprised listed companies on the Warsaw Stock Exchange (WSE). The role and effect of accounting financial measures on executive compensation are analyzed based on three regression models. The period of analysis spanned ten years, from 2009 to 2018. Findings & value added: There are three conclusions that can be drawn from the study. Firstly, executive compensation in the analyzed companies largely depends on the accounting measures of financial performance, based on net income and comprehensive income (excluding ROE). Secondly, its level is significantly and positively influenced by the company?s size, Tobin?s Q ratio, debt ratio, and dividend rate. Thirdly, comprehensive income has a stronger effect on executive compensation than net income. Our findings add some potentially noteworthy dimensions to the economic literature on corporate governance, which is especially important to apply in the CEE region and other emerging economies. The Anglo-American assumption of corporate governance and executive compensation policy might not be suitable for the realities in much of the world.
Źródło:: Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 2; 459-480
1689-765X
2353-3293
Pojawia się w:: Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:: Biblioteka Nauki

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