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Search Results: 1 - 10 of 67866 matches for " Yin Yuan-zhao "
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THEORETICAL ANALYSIS OF FREE ELECTRON LASER AMPLIFIER
自由电子激光放大器的理论分析

YIN YUAN-ZHAO,
尹元昭

物理学报 , 1983,
Abstract: In this paper, a detailed analysis on the operating mechanism and parameter properties of free electron laser amplifier (FELA) in the case of small signal is presented. The results show that FELA is in essence the interaction between the electron beam and the fast cyclotron wave. The cyclotron resonance condition of electron motion in the uniform axial and periodic transverse static magnetic fields significantly influences the interaction process. We have calculated numerically the central operating frequency, band width, small signal gain and wave number of the amplified electromagnetic wave as functions of the parameters of the amplifier (such as the voltage and current density of the electron beam, the intensities of axial and transverse static magnetic field). The way to optimize the design of FELA is also suggested. It is possible to obtain a small signal gain of 10-2 cm-1 with enough band width in the millimeter and submillimeter range of weve length following a proper design.
INCREASED GAIN OF FREE ELECTRON LASER WITH MAGNETIZED RELATIVISTIC ELECTRON BEAM
用磁化电子束提高自由电子激光器的增益

Yin Yuan-zhao,
尹元昭

电子与信息学报 , 1982,
Abstract: The stimulated Raman scattering of incident pump wave caused by a magnetized intense relativistic electron beam is analyzed theoretically. The results show that the magnetized beam can increase the gain of the free electron laser if the electron cyclotron frequency Q// in the axial static magnetic field is equal to the frequency ωi of the incident pump wave in the electron beam frame of reference. In this case the growth rate is ωi/ωi- Q// times of that for the unmagnetized beam.
The Application of New Chiral Ferrocene Ligands in Asymmetric Transfer Hydrogenation of Ketones  [PDF]
Yuan-Zhao Mo, Quan-Jun Wang, Hui-Fang Nie, Qiao-Feng Wang
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.81004
Abstract: Four easily available ferrocenyl chiral ligands have been screened firstly for ruthenium (II)-catalyzed asymmetric transfer hydrogenation of acetophenone with HCOOH/Et3N azeotrope as the hydrogen source. A moderate chemical yield of 1-phenylethanol with 83% ee was obtained when (RC, SFc)-1-(Diphe-nylphosphino)-2-[1-N-(3-methylpyridin-2-ylmethyl) ethyl] ferrocene (L1) was used. Particularly, both ruthenium and iridium could coordinate with L1 to accomplish the asymmetric reduction of series of aromatic ketones separately. The desired products were achieved with up to 86% ee.<
The simulink simulation of time access services in SOIS
SOIS中时间访问服务的Simulink仿真

ZHANG Yuan-zhao,NING Hong,
张元昭
,宁洪

计算机应用 , 2007,
Abstract: Spacecraft Onboard Interface Services(SOIS) is a standard of onboard protocol and software services,the outmost layer of which defines the uniform services interface for user.Time access service is one of the basic services.A new method of Simulink/Stateflow modeling was proposed to simulate the Time Access Services.
Triad,a New Approach for Contaminated Site Management
Triad, 污染场地管理的新模式

DING Yuan-zhao,SHEN Xin,ZENG Hui,LI Xi-qing,
丁远昭
,沈欣,曾辉,李喜青

环境科学 , 2011,
Abstract: Remediation of a contaminated site is typically a time-consuming and expensive process.The traditional multistage approach of site management is an important contributor of this lengthy and costly process.The emergence of new characterization technologies and past experiences have led to the development of a new site characterization and remediation approach-Triad approach.In this paper,the three key components of the Triad approach,namely,systematic project planning,dynamic work strategy,and real-time meas...
基于物理内存的注册表逆向重建取证分析算法
A forensic analysis algorithm of registry reverse reconstruction based on physical memory

高元照,李炳龙,吴熙曦
GAO Yuan-zhao
, LI Bing-long, WU Xi-xi

- , 2016, DOI: 10.6040/j.issn.1671-9352.2.2015.140
Abstract: 摘要: 注册表结构重建与分析是Windows物理内存取证分析的重点和难点问题之一。首先通过分析注册表文件在硬盘中的逻辑特性,利用Windows系统调试工具分析注册表在内存中的数据结构特征,确立了在物理内存中定位注册表结构的方法;然后通过分析注册表项之间的树形关系,确定了注册表结构重建算法,并利用Graphviz可视化工具,设计出一种树形结构的可视化算法。实验结果表明,该算法能够实现对物理内存中注册表键名、键值信息的重建,基于获取的数据能够完成对系统中病毒的检测,并通过Graphviz可视化算法有效展示病毒感染系统的过程和结果。
Abstract: The reconstruction and analysis of the registry is one of the most important and difficult aspects of the Windows physical memory forensics. By analyzing the logical structure of the registry files in the hard disk and exploring the data structure features of the registry in the physical memory based on the Windows debugging tools, we proposed a clear and definite method to locate the registry physical addresses in the memory. Furthermore, by analyzing the tree-structured relationship between the entries of the registry, we designed a registry reconstruction algorithm and implemented a dendrogram visualization algorithm for the reconstructed registry based on Graphviz. The results of the experiment show that we can reconstruct of the names and values of the registry entries, retrieve the virus in the system based on the information we got, and finally display the process and results of the virus infection via the registry visualization
Risk Factor Empirical Research of PPP Projects Based on Factor Analysis Method  [PDF]
Hang Yin, Yuan-Fu Li, Dong-Mei Zhao
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.56038
Abstract: As an innovative investment and financing system of urbanization and the key to the local financing platform to resolve the debt risk, PPP projects have great significance to the current Chinese economy. At present, domestic PPP projects lack of benefit sharing standard and the mechanism of risk-sharing and risk factor analysis is the premise of risk-sharing. Adopting the raw data of major risk factors by questionnaire investigation from a key domestic PPP project, and using SPSS and factor analysis method to do an empirical test, a financing risk index system is built. The results of the study also reveal that financing risk factors are the most important ones to a particular PPP project.
Environmental Performance and Financial Performance of Green Mutual Fund—Evidence from China  [PDF]
Yin Yuan
Open Journal of Business and Management (OJBM) , 2017, DOI: 10.4236/ojbm.2017.54057
Abstract:
We compared the environmental performance and financial performance between green fund and non-green fund to explore the balance between environmental goals and financial objectives of green funds by in the context of China government’s strong advocacy of “developing green finance and setting up green development fund”. In this paper, the open-ended active fund with the shareholding ratio of over 75% is taken as the object of study. By the PSM method, 28 green funds are matched by 1:5 to obtain 140 non-green funds. Through the large sample data of 2010-2016, the results show that: 1) the green fund investment portfolio is cleaner than non-green fund. From the long-term environmental performance of the holding enterprises, the green and the non-green fund’s environmental performance and financial performance are tested empirically. Fund environmental performance is better than non-green fund. From the perspective of the short-term environmental performance of the holding enterprises, there is no difference between the environmental performance of the green fund and the non-green fund. 2) The excess return of the green fund is higher than that of the non-green fund. In the period of China’s economic transformation, green funds not only assume the responsibility of investing in environmental performance of enterprises, but also take into account its financial performance, to achieve a win-win result of low pollution and high yield.
Thermal Analysis of Air-Core Power Reactors
Zhao Yuan,Jun-jia He,Yuan Pan,Xiao-gen Yin
ISRN Mechanical Engineering , 2013, DOI: 10.1155/2013/865015
Abstract:
Effects of EDTA and DTPA on Lead and Zinc Accumulation of Ryegrass  [PDF]
Hua-Yin Zhao, Li-Jin Lin, Qiao-Lun Yan, Yuan-Xiang Yang, Xue-Mei Zhu, Ji-Rong Shao
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.27106
Abstract: The tailing ponds of lead-zinc mines are artificial environment pollution sources, and also important dangerous sources of heavy metal contamination in lead-zinc mining areas. To study the effects of Ethylene Diamine Tetracetic Acid (EDTA) and Diethylene Triamine Penlaacetic Acid (DTPA) on phytoremediation of lead-zinc mining area soil, two chelators (EDTA and DTPA) were used in enrichment plant ryegrass to improve the uptake of Pb and Zn from soil. The results showed that when the doses of 0, 0.5, 1 and 2 mmol/kg EDTA and DTPA were used, the biomass of ryegrass (Lolium multiflorum Lam.) and its nutrient (N, P, K, Ca and Mg) content increased, whereas EDTA and DTPA with a dose of 4 mmol/kg decreased the biomass of ryegrass and its nutrient (N, P, K, Ca and Mg) content. EDTA and DTPA significantly enhanced the contents of Zn and Pb in ryegrass as compared with the control. As for Pb, the content of Pb in root and shoot reached a maximum of 2730.54 and 2484.42 mg/kg respectively when the dose of EDTA and DTPA was 2 mmol/kg. In the case of Zn, the content of Zn in root and shoot reached a maximum of 2428.37 and 2010.43 mg/kg respectively. The total Pb and Zn accumulations and translocation ratio in ryegrass had also been enhanced. The results indicated that EDTA and DTPA had great potential to be used for ryegrass to remedy Pb and Zn contamination soil of lead-zinc mining area, but should be used cautiously because of their environmental risks.
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