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Experimental study on performance of 100-kW low temperature superconducting steady-state magnetoplasmadynamic thruster

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Chinese Physics B 2025年第2期34卷 328-332页

作者： Cheng Zhou Peng Wu Yun-Tao Song Jin-Xing Zheng Yong Li Ge Wang Hai-Yang Liu University of Science and Technology of China Hefei 230031China Hefei Institutes of Physical Science Chinese Academy of SciencesHefei 230031China Beijing Institute of Control Engineering Beijing 100080China

Applied field magnetoplasmadynamic thrusters(AF-MPDTs), with their high specific impulse and considerable thrust, are increasingly favored for large-scale space missions. This paper presents the composition, functionality, and testing methods of a high-power electric propulsion performance testing system, along with the vacuum ignition test results of a 100 kW superconducting MPD thruster. The relationships between thruster efficiency, magnetic field strength, current,and mass flow rate are analyzed. For each combination of current and flow rate in an AF-MPDT, there is an optimal magnetic field strength where the thruster efficiency reaches its peak. Under conditions of 320 A current and 60 mg/s flow rate,the optimal magnetic field strength is 0.5 T, yielding the highest thruster efficiency of 71%.

关键词： magnetoplasmadynamic thruster high-power electric propulsion superconduction performance measurements

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Investigating the Islamic and Conventional Mutual Fund performance: Evidence From Malaysia Equity Market

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Journal of Modern Accounting and Auditing 2019年第7期15卷 371-384页

作者： Shaliza Alwi Rosimah Ahmad Irma Zura Amir Hashim Norbaizura Mohd Naim Taylor’s University Subang Jaya Malaysia

The phenomena of financial crisis (2007-2008) shows a significant breakdown of US$16 trillion in conventional financial industry. This provides an opportunity for Islamic capital market to drive the global asset growth investments to investors. Previous studies signal mixture results on Islamic mutual fund (IMF) and conventional mutual fund (CMF) performance. This study aims to analyze the performance of 200 IMFs and CMFs from 2007 to 2015. The sub-sample period of 2007 to 2015 will be compared to the era of financial crisis from 2007-2008. Findings show all types of mutual funds are performed throughout 2007 until 2015. The results provide information that would benefit the investors and market players in asset funds selection.

关键词： equity fund Islamic mutual funds coventional mutual funds performance measurements

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Test Rig Effect on performance Measurement for Low Loaded Large-Diameter Fan for Automotive Application

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Journal of Mechanics Engineering and Automation 2014年第12期4卷 924-936页

作者： Manuel Henner Bruno Demory Franqois Franquelin Youssef Beddadi Zebin Zhang Valeo Thermal Systems- 8 La VerriOre 78321 France

Large diameter fans with low solidity are widely used in automotive application for engine cooling. Their designs with small chord length help reducing the torque on the electrical motor and providing a good aerodynamic compromise between several operating conditions, some of these being at high flow rate. Their global performances are measured according to the ISO standard DP 5801, which allows comparison of results from different facilities. However, some variations in global performances are observed when considering results from two different test rigs. On a fan selected for the purpose of this study, up to 6 % of efficiency is lost on the worst case. As efficiency is more than ever a key factor to select a component, some experimental and numerical investigations were conducted to analyze the fan behavior on each facility. Two sets of measurement and simulation are performed and compared. Geometries considered for the domain of computation include the test rig plenum, the torquemeter, the ground and a large domain for the atmospheric conditions. The exact fan geometry with tip clearance and under-hub ribs is also considered. Numerical results show a good agreement with experiment in both cases when convergence is reached and for low flow rate when computations are switched to unsteady mode. Comparisons show that simulations are able to capture the different fan behaviors depending on the confguration and those efficiency losses previously observed are correctly predicted. These results are further analyzed to perform some post-processing. Blade loading remains identical for both cases but disparities appear in the wake and its interaction with the surrounding. Tiny details that are often neglected during experiment and/or simulation appear to be the cause of slight variations. Position of the torquemeter and shape of the plenum are among the parameters that various and that have cumulative effects. Efficiency being a ration of pressure and torque, variations ar

关键词： Fan performance measurements test rig validation torque uncertainty.

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平衡计分卡（Balanced Scorecard）

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工业企业管理 2003年第5期

作者：栾庆伟尹洪亮

平衡计分卡作为新兴的效绩评价系统，在美国应用已近十年。它弥补了传统效绩评价偏重财务指标的不足，增加了评价企业长期成功驱动因素的新指标。从财务、客户、内部业务和学习成长等多角度全面衡量企业效绩，并帮助管理者将组织的战略... 详细信息

平衡计分卡作为新兴的效绩评价系统，在美国应用已近十年。它弥补了传统效绩评价偏重财务指标的不足，增加了评价企业长期成功驱动因素的新指标。从财务、客户、内部业务和学习成长等多角度全面衡量企业效绩，并帮助管理者将组织的战略目标转化为实施的具体指标。着重阐述平衡计分卡的起源，特点、结构和应用及发展趋势。

关键词：平衡计分卡效绩评价战略管理 Balanced Scorecard performance measurements strategic management

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