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Impact of FACTS devices on exercising market power in deregulated electricity market

Shanmugam PRABHAKAR KARTHIKEYAN, I. JACOB RAGLEND, D. P. KOTHARI

《能源前沿（英文）》 2013年 第7卷 第4期   页码 448-455 doi: 10.1007/s11708-013-0262-x

摘要： In power system studies, congestion in transmission lines and utilization of flexible alternating current transmission system (FACTS) devices are closely associated. These devices are very important due to their role in power delivery system enhancement. It is to be noted that the generation companies can exercise their market power which depends on the line flows, line constraints, generators’ location and its share to the individual loads. This issue cannot be overlooked as it creates monopoliness which is against the deregulated market policy. The objective of this paper is to study the impact of market power when FACTS devices like thyristor controlled switching capacitor (TCSC) and thyristor controlled phase angle regulator (TCPAR) are used under steady state operation. The market power is determined using nodal must-run share (NMRS) index for the standard IEEE 14-bus system with and without the above FACTS devices and the results obtained are compared. All the above simulations are conducted in a MATLAB 7.9-R2009b environment.

关键词： flexible alternating current transmission system (FACTS)     thyristor controlled switching capacitor (TCSC)     thyristor controlled phase angle regulator (TCPAR)     market power     must-run generation (MRG)     nodal must-run share (NMRS)    

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China must have its own unique sustainable energy system

Weidou NI , Shilie WENG ,

《能源前沿（英文）》 2009年 第3卷 第1期   页码 1-1 doi: 10.1007/s11708-009-0300-x

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5G演进推动天线系统创新 Correspondences

Feng GAO, Peng GAO, Wen-tao ZHU, Chen-xi ZHANG, Xian-kun MENG, Run-hong SHAN

《信息与电子工程前沿（英文）》 2020年 第21卷 第1期   页码 188-194 doi: 10.1631/FITEE.1900561

摘要： 介绍第一代（1G）到第五代（5G）移动通信系统及其天线系统的基本概念、背景和发展历程。阐明5G组网和天线系统优化要求，并介绍三维阵列天线基本原理。提出大规模多输入多输出（MIMO）天线阵列权值优化方法，并进行仿真验证。最后，提出解决5G天线系统功耗问题的几点建议。

关键词： 第五代通信系统（5G）；大规模多输入多输出（MIMO）天线阵列；功耗；权值优化    

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Study on the crystal morphology and melting behavior of isothermally crystallized composites of short carbon fiber and poly(trimethylene terephthalate)

Mingtao RUN, Hongzan SONG, Yanping HAO

《化学科学与工程前沿（英文）》 2009年 第3卷 第3期   页码 255-264 doi: 10.1007/s11705-009-0008-9

摘要： The spherulites of the short carbon fiber(SCF)/poly (trimethylene terephthalate) (PTT) composites formed in limited space at designed temperatures, and their melting behaviors were studied by the polarized optical microscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM), respectively. The results suggest that SCF content, isothermal crystallization temperatures, and the film thicknesses influence the crystal morphology of the composites. The dimension of the spherulites is decreased with increasing SCF content, but whether banded or nonbanded spherulites will form in the composites is not dependent on SCF content. However, the crystal morphology of the composites depends strongly on the temperature. When the isothermal crystallization temperatures increase from 180°C to 230°C, the crystal morphology of SCF/PTT composites continuously changes in the following order: nonbanded → banded → nonbanded spherulites. Discontinuous circle lines form in the film when the film thickness increases from 30 to 60 μm. Basing on the SEM observation, it is found that these circle lines are cracks formed due to the constriction difference of the different parts of the spherulites. These cracks are formed when the film is cooled from the isothermal crystallization temperature to the room temperature at a slow cooling rate; while they will disappear gradually at different temperatures in the heating process. The crack will appear/disappear first around the center of the spherulite when the film was cooled/heated. The nontwisted or slightly twisted lamellas will reorganize to form highly twisted lamellas inducing apparent banded texture of the spherulites.

关键词： poly(trimethylene terephthalate)     short carbon fiber     banded spherulites     crack    

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信息物理融合系统运行支撑平台研究综述 Review

Yuan SUN, Gang YANG, Xing-she ZHOU

《信息与电子工程前沿（英文）》 2017年 第18卷 第10期   页码 1458-1478 doi: 10.1631/FITEE.1601579

摘要： 信息物理融合系统（cyber physical systems, CPSs）的计算、通信与物理过程紧密耦合且持续交互的独有特性使CPS设计与实现的复杂程度明显增加。基于CPS运行支撑平台构造CPS应用任务是应对这一挑战的一种有效手段。为了更好地深化相关研究，论文分析和评价了现有CPS运行支撑平台。首先从体系结构角度给出了一种CPS运行支撑平台的分类方法；同时结合具体实例深入论述了每一类CPS运行支撑平台的设计思想、关键技术问题及其解决方法；在此基础上，从CPS应用任务构造、非功能属性支持等方面比较了现有CPS运行支撑平台；最后指出了在后续研究中需要进一步关注的关键问题。

关键词： 信息物理融合系统；运行支撑平台；构件；服务；Agent    

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Run-time system based on LinSERCANS and Soft-PLC

Cunfeng KANG, Chong WANG, Chunmin MA, Xudong HUANG, Renyuan FEI

《机械工程前沿（英文）》 2009年 第4卷 第2期   页码 120-124 doi: 10.1007/s11465-009-0019-8

摘要： Soft-PLC with open architecture is the direction of development in industrial automation. This paper discusses the method of communication between the interface functions of LinSERCANS under RTLinux and the external library of Soft-PLC under Windows. Based on the API HOOK theory, the communication between the interface functions of LinSERCANS and the external libraries of Soft-PLC is set up and it solves the calling functions of dynamic link libraries in different operation systems. It is able to combine LinSERCANS with the Soft-PLC, and a run-time system is developed based on the interface technology of the serial real-time communication system (SERCOS) and technology of soft-PLC. This run-time system has been used in all electronic injection molding machines and works very well.

关键词： Soft-PLC     run-time system     LinSERCANS     dynamic link libraries    

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Distributed flexible reconfigurable condition monitoring and diagnosis technology

HU You-min, YANG Shu-zi, DU Run-sheng

《机械工程前沿（英文）》 2006年 第1卷 第3期   页码 276-281 doi: 10.1007/s11465-006-0025-z

摘要： As manufacturing becomes increasingly decentralized, flexible and reconfigurable, more research needs to be done on monitoring and diagnosis technology that accommodate these new trends. The distributed condition monitoring and diagnosis technology based on the flexible and reconfigurable concept is studied here. A condition monitoring diagnosis model based on the distributed flexible and reconfigurable idea is proposed in this paper. The component makeup and functions of this model are discussed in detail. The model can fulfill in most instances the manufacturing system requirements for changing the configuration of the monitoring diagnosis system according to different manufacturing system configurations. This model also realizes the flexibility and reconfigurability of the monitoring diagnosis system in some degree. The model has already spawned a successful prototype for monitoring a chemical plant in accomplishing monitoring and control of the production process and equipment. Finally, some future research work is pointed out.

关键词： chemical     diagnosis system     configuration     monitoring     equipment    

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Rational Understanding about Renaissance Path of China's Road and Bridge Engineering

Mao-run Feng,Zheng-song Zhao

《工程管理前沿（英文）》 2014年 第1卷 第1期   页码 42-51 doi: 10.15302/J-FEM-2014013

摘要： At the turn of this century, China began the largest road and bridge development in the world, which has virtuously interacted with the social and economic development and has elevated the engineering technology to world-class level. Surveying the development of world transportation, and comparing the road and bridge construction efforts of Europe, U.S.A, Japan and China, general experiences of success can be derived as follows: It is greatly beneficial to give priority to transportation for economic development; it takes national strategy and social action to build up a transportation network; demand and innovation are the driving forces to upgrade road and bridge technology; management innovation and quality assurance can greatly improve development caliber. While rationally acknowledging China's transportation infrastructure achievements, we should reflect on issues with Chinese characteristics that have affected quality and efficiency, expose all construction practices that violate scientific law, overall management defects in road and bridge construction and maintenance, and search for new ways to strengthen social management and the creation of a healthy soft environment.

关键词： road network     expressway     bridge project     technological innovation     construction management     social management    

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Fast implementation of kernel simplex volume analysis based on modified Cholesky factorization for endmember extraction

Jing LI,Xiao-run LI,Li-jiao WANG,Liao-ying ZHAO

《信息与电子工程前沿（英文）》 2016年 第17卷 第3期   页码 250-257 doi: 10.1631/FITEE.1500244

摘要： Endmember extraction is a key step in the hyperspectral image analysis process. The kernel new simplex growing algorithm (KNSGA), recently developed as a nonlinear alternative to the simplex growing algorithm (SGA), has proven a promising endmember extraction technique. However, KNSGA still suffers from two issues limiting its application. First, its random initialization leads to inconsistency in final results; second, excessive computation is caused by the iterations of a simplex volume calculation. To solve the first issue, the spatial pixel purity index (SPPI) method is used in this study to extract the first endmember, eliminating the initialization dependence. A novel approach tackles the second issue by initially using a modified Cholesky factorization to decompose the volume matrix into triangular matrices, in order to avoid directly computing the determinant tautologically in the simplex volume formula. Theoretical analysis and experiments on both simulated and real spectral data demonstrate that the proposed algorithm significantly reduces computational complexity, and runs faster than the original algorithm.

关键词： Endmember extraction     Modified Cholesky factorization     Spatial pixel purity index (SPPI)     New simplex growing algorithm (NSGA)     Kernel new simplex growing algorithm (KNSGA)    

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Treatment of severe diffuse cavernous hemangioma of the lower limb by combination of superficial femoral artery ligation and supergenual thigh amputation

Yin XIA, Dan SHANG, Qin LI, Xiaoqin RUN, Chenxi OUYANG, Yiqing LI, Bi JIN

《医学前沿（英文）》 2009年 第3卷 第2期   页码 240-244 doi: 10.1007/s11684-009-0031-8

摘要： Severe diffuse cavernous hemangioma of the lower limb is rarely seen among young people and sometimes can be a fatal challenge for operation. We reported a case of diffuse cavernous hemangioma involving both skin and muscles of the left lower limb and perineal region in an adolescent patient. The patient who had previously undergone a local hemangioma resection of the foot ultimately ended in superficial femoral artery ligation and supergenual thigh amputation of the left upper leg because of uncontrollable massive bleeding of anastomotic stoma.

关键词： cavernous hemangioma     femoral artery     ligation     amputation    

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Fabrication of high-capacity cation-exchangers for protein adsorption: Comparison of grafting-from and grafting-to approaches

Ming Zhao, Run Liu, Jian Luo, Yan Sun, Qinghong Shi

《化学科学与工程前沿（英文）》 2019年 第13卷 第1期   页码 120-132 doi: 10.1007/s11705-018-1730-y

摘要： In this work, we have synthesized two polymer-grafted cation exchangers: one via the grafting-from approach, in which sulfopropyl methacrylate (SPM) is grafted through atom transfer radical polymerization onto Sepharose FF (the thus resulting exchanger is referred as Sep- -SPM), and another via the grafting-to approach, in which the polymer of SPM is directly coupled onto Sepharose FF (the thus resulting exchanger is called as Sep- SPM). Protein adsorption on these two cation exchangers have been also investigated. At the same ligand density, Sep- -SPM has a larger accessible pore radius and a smaller depth of polymer layer than Sep- SPM, due to the controllable introduction of polymer chains with the regular distribution of the ligand. Therefore, high-capacity adsorption of lysozyme and -globulin could be achieved simultaneously in Sep- -SPM with an ionic capacity (IC) of 308 mmol·L . However, Sep- SPM has an irregular chain distribution and different architecture of polymer layer, which lead to more serious repulsive interaction to proteins, and thus Sep- SPM has a lower adsorption capacity for -globulin than Sep- -SPM with the similar IC. Moreover, the results from protein uptake experiments indicate that the facilitated transport of adsorbed -globulin occurs only in Sep- SPM and depends on the architecture of polymer layers. Our research provides a clear clue for the development of high-performance protein chromatography.

关键词： polymer-grafted ionic exchanger     grafting technique     protein adsorption     atom transfer radical polymerization     γ-globulin    

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Analytical study on damping performances of magnetorheological grease damper based on disk squeeze mode and experimental test

Danxia ZHAO, Changrong LIAO, Qiong LIU, Jing LUO

《机械工程前沿（英文）》 2011年 第6卷 第3期   页码 312-317 doi: 10.1007/s11465-011-0235-x

摘要：

In this paper, a small displacement-type magnetorheological grease (MRG) damper based on disk squeeze mode is proposed. The squeeze flow differential equation is obtained. The Navier slip condition is considered on the surfaces and the boundary compatible condition is established. The radial velocity profiles and the radial pressure distributions are derived respectively, and the mathematical stress expression is calculated. To verify rationality of analytical method, the MRG damper is designed and fabricated according to the technical requirements of an engine vibration isolation system. The experimental damping force from MTS870 Electro-hydraulic Servo with sine wave excitation shows that the proposed analytical method is feasible and provides the reference value for designing MRG damper based on disk squeeze mode.

关键词： magnetorheological grease (MRG)     damper     squeeze model    

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Studies on advanced water-cooled reactors beyond generation III for power generation

CHENG Xu

《能源前沿（英文）》 2007年 第1卷 第2期   页码 141-149 doi: 10.1007/s11708-007-0018-6

摘要： China s ambitious nuclear power program motivates the country s nuclear community to develop advanced reactor concepts beyond generation III to ensure a long-term, stable, and sustainable development of nuclear power. The paper discusses some main criteria for the selection of future water-cooled reactors by considering the specific Chinese situation. Based on the suggested selection criteria, two new types of water-cooled reactors are recommended for future Chinese nuclear power generation. The high conversion pressurized water reactor utilizes the present PWR technology to a large extent. With a conversion ratio of about 0.95, the fuel utilization is increased about 5 times. This significantly improves the sustainability of fuel resources. The supercritical water-cooled reactor has favorable features in economics, sustainability and technology availability. It is a logical extension of the generation III PWR technology in China. The status of international R&D work is reviewed. A new supercritical water-cooled reactor (SCWR) core structure (the mixed reactor core) and a new fuel assembly design (two-rows FA) are proposed. The preliminary analysis using a coupled neutron-physics/thermal-hydraulics method is carried out. It shows good feasibility for the new design proposal.

关键词： Chinese situation     selection     generation     water-cooled     feasibility    

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Synthesis and photoconductivities of bisazo charge generation materials

ZHAO Qian, WANG Shirong, LI Xianggao, HE Lili

《化学科学与工程前沿（英文）》 2008年 第2卷 第3期   页码 330-334 doi: 10.1007/s11705-008-0061-9

摘要： Six bisazo compounds were synthesized by coupling 2-(4′-aminophenyl)-6-aminobenzoxazole as diazo component with -phenyl-′-(2-hydroxy-3-naphthoyl)urea derivatives, and characterized by ultraviolet and visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR) and elemental analysis (EA). Using these bisazo compounds as charge generation materials and CT-191(2-methyl-4-(-dibenzyl)aminobenzoaldehyde-1,1-diphenylhydrazone) as charge transportation material, organic photoconductive devices were prepared. The result from photoconductivity measurement of the devices shows that the bisazo compound from -(2-methylphenyl)-′-(2-hydroxy-3-naphthoyl)urea has the best xerographic performance, = 600 V, = 30 V, = 15 Vs, = 3.5 lxs.

关键词： -6-aminobenzoxazole     4′-aminophenyl     transportation     xerographic performance     generation    

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Self-generation of machining precision and its realization in lapping of super precision solid balls

ZHANG Bopeng

《机械工程前沿（英文）》 2008年 第3卷 第3期   页码 348-353 doi: 10.1007/s11465-008-0065-7

摘要： This paper presents the principle of self-generation of machining precision by explaining its basic concept and five necessary conditions for forming a system with self-organization capability. A self-generation system is a kind of system with self-organization capability. The self-generation of machining precision for solid balls with super precision is emphatically explained. From the viewpoint of self-organization, there are three types of systems including system 1 with the self-regulation capability, 2 with the self-determination capability of goals, and 3 with the self-organization capability. Although they are all closed loop control systems, they have different constructions and functions. Necessary conditions for achieving self-generation of machining precision are given. Establishment of the system for machining solid balls with super precision is discussed. Self-generation of machining precision for solid balls with super precision on the basis of the capability of self-removal of errors is presented. Self-generation includes the ability of self-removal of errors for solid balls, convergence of self-removal of errors, self-generation of precision, and self-generating system for the given.

关键词： self-generation     necessary     self-regulation capability     viewpoint     Necessary    

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标题 作者 时间 类型 操作

Impact of FACTS devices on exercising market power in deregulated electricity market

Shanmugam PRABHAKAR KARTHIKEYAN, I. JACOB RAGLEND, D. P. KOTHARI

期刊论文

China must have its own unique sustainable energy system

Weidou NI , Shilie WENG ,

期刊论文

5G演进推动天线系统创新

Feng GAO, Peng GAO, Wen-tao ZHU, Chen-xi ZHANG, Xian-kun MENG, Run-hong SHAN

期刊论文

Study on the crystal morphology and melting behavior of isothermally crystallized composites of short carbon fiber and poly(trimethylene terephthalate)

Mingtao RUN, Hongzan SONG, Yanping HAO

期刊论文

信息物理融合系统运行支撑平台研究综述

Yuan SUN, Gang YANG, Xing-she ZHOU

期刊论文

Run-time system based on LinSERCANS and Soft-PLC

Cunfeng KANG, Chong WANG, Chunmin MA, Xudong HUANG, Renyuan FEI

期刊论文

Distributed flexible reconfigurable condition monitoring and diagnosis technology

HU You-min, YANG Shu-zi, DU Run-sheng

期刊论文

Rational Understanding about Renaissance Path of China's Road and Bridge Engineering

Mao-run Feng,Zheng-song Zhao

期刊论文

Fast implementation of kernel simplex volume analysis based on modified Cholesky factorization for endmember extraction

Jing LI,Xiao-run LI,Li-jiao WANG,Liao-ying ZHAO

期刊论文

Treatment of severe diffuse cavernous hemangioma of the lower limb by combination of superficial femoral artery ligation and supergenual thigh amputation

Yin XIA, Dan SHANG, Qin LI, Xiaoqin RUN, Chenxi OUYANG, Yiqing LI, Bi JIN

期刊论文

Fabrication of high-capacity cation-exchangers for protein adsorption: Comparison of grafting-from and grafting-to approaches

Ming Zhao, Run Liu, Jian Luo, Yan Sun, Qinghong Shi

期刊论文

Analytical study on damping performances of magnetorheological grease damper based on disk squeeze mode and experimental test

Danxia ZHAO, Changrong LIAO, Qiong LIU, Jing LUO

期刊论文

Studies on advanced water-cooled reactors beyond generation III for power generation

CHENG Xu

期刊论文

Synthesis and photoconductivities of bisazo charge generation materials

ZHAO Qian, WANG Shirong, LI Xianggao, HE Lili

期刊论文

Self-generation of machining precision and its realization in lapping of super precision solid balls

ZHANG Bopeng

期刊论文