bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Simulation for Grid-Connected Inverters of Distributed Generation Based on DIgSILENT Software
Authors: Zhao Zhang Le , Zhang You Bing , Qi Jun
Published: March 2013

This paper introduces some typical control methods for the grid-connected inverters in the distributed generation (DG) systems, the double-loop control strategy is focused on and analyzed in detail. The proposed outer-loop control strategies are summarized. Meanwhile, the inner-loop control method established on dq rotating frame is introduced. The simulation models of the inverters for DG in the DIgSILENT software are introduced, and the simulations for the proposed control strategies are realized.
Research on Plug&Play Technology for Smart Grid Information Exchange Bus
Authors: Zhang Di Si , Lv Guang Xian , Liu Peng , Su Xue Yuan , Liu Hai Tao
Published: March 2013

To promote the ease of use and reliability of IEC 61968 based Information Exchange Bus and fulfill the rapid establishment of inter-buses and adapters-bus communication channels, this article first analyzes the status quo of distribution automation integrity. Combined with the concept of universal PnP technology, the functions of IEC 61968 based adapters as well as buses are improved and more adapted. Considering characteristics of IEC 61968 standards, components like adapter identification information, topic-authorization table, and topic-authorization routing table are introduced and then a set of special mechanisms are built, including binding&unbinding procedures for inter-buses and adapters-buses, retransmission scheme, and mergence of topic authorization routing tables used to control information flow. By implementing this theory, the adapters-buses and inter-buses PnP functions are realized and the ease of use and reliability of smart grid information exchange buses are enhanced.
Reformative Arithmetic for Non Detection Zone Islanding Detection Based on the Voltage Shift Technique
Authors: Zhang Ji Hong , Yang Pei Hong , Wu Zhen Kui
Published: March 2013

The quick & exact anti-islanding is a mandatory feature for grid-connected distributed generation system. The conventional passivity detection method has the biggish blind section and lower reliability, especially when the grid-connected inverter export power and burthen power are balanceable; the islanding detection often is disabled. And that the initiative islanding detection method is considered an effective measure, but if the arithmetic & parameter choice irrelevantly, the islanding can not be detected easily; even injected harmonic to the grid and destroy power quality. An improved voltage shift technique islanding detection arithmetic is put forward in this paper, and the correlative mathematics model is established, and the project is analyzed and studied theoretically based on IEEE Std.2009-929 criterion. The result shows the method will not affect power quality, at the same time it can detect islanding phenomenon quickly& exactly, so it is feasible.
Support Vector Machine Based Voltage Relays for Voltage Disturbance Detection in Micro-Distribution Systems
Authors: Lin Whei Min , Tu Chia Sheng , Ou Ting Chia
Published: March 2013

This study proposes combining fuzzy inference system and support vector machine based voltage relays for voltage disturbance detection in micro-distribution systems (MDSs). Moreover, the coordination characteristic curves of the trigger time versus dynamic errors are proposed for under-voltage and over-voltage protection. Modified coordination characteristic curves use a critical trigger time to isolate the faults. An support vector machine (SVM) is a multi-layer decision-making model, which detects voltage disturbances, such as voltage swell, voltage sag, voltage unbalance, and faults. Computer simulations are conducted, using an IEEE 30-bus power system and micro-distribution systems, to show the effectiveness of the proposed voltage relays.
Discuss Hydrogen Production in Jiangsu Province Using Non-Grid-Connected Offshore Wind Power
Authors: Shi Sai Yu , Cheng Fei , Nayel Mohanmed
Published: March 2013

Jiangsu is one of the most prosperous provinces in China with the highest population density but a shortage of fossil fuel. However, wind energy is recognized as a sustainable resource which is abundant in Jiangsu Province. Even so, the fluctuation of wind power, offshore and non-grid-connected wind power systems are required to manage this fluctuation. In addition, hydrogen production using wind power is a new idea to increase the contribution of wind power. According to the current situation of Jiangsu Province and wind power technology in China, there are both advantages and disadvantages to the method of hydrogen production in using non-grid-connected offshore wind power.
Research on SVM Line Loss Rate Prediction Based on Heuristic Algorithm
Authors: Tian Li , Wang Qiang Qiang , Cao An Zhao
Published: March 2013

With the characteristic of line loss volatility, a research of line loss rate prediction was imperatively carried out. Considering the optimization ability of heuristic algorithm and the regression ability of support vector machine, a heuristic algorithm-support vector machine model is constructed. Case study shows that, compared with other heuristic algorithms’, the search efficiency and speed of genetic algorithm are good, and the prediction model is with high accuracy.
Application of Traps in Detection of Temporary Ground Wires
Authors: Xie Hong Ling , Fan Huan Yu , Li Yan Qing , Wang Fei Long
Published: March 2013

Leakage demolition of temporary ground wires often leads to accidents named closing circuit breaker. For this, a detection device is designed in this paper, which is exclusive for the detection of temporary ground wires connected to the ground through towers. Traps present low impedance for 50Hz induced signal while they present high impedance for 200Hz sinusoidal signal, thus inducted current will flow into the earth through the path of traps and ground wires. The amplitude of 200kHz signal collected by the MCU is related to whether there are temporary ground wires connected to power lines. The MCU completes digital filtering work of the collected signal and counts the number that amplitude above the threshold voltage to determine whether there are any temporary ground wires connected to power lines.
Network Partition and Pilot Nodes Selection for Reactive Power / Voltage Control Based on the Complex Network Theory
Authors: Wang Xing Hua , Cai Ze Xiang
Published: March 2013

Conventional network partition and pilot nodes selection methods for reactive power / voltage control are mainly based on the reactive power - voltage sensitivity, however, it is hard to regulate the balance of the reactive power in partitions and pilot nodes may over-concentrate in some regions. According to the community detection algorithm in complex network theory, an improved community modular index is proposed with the consideration of the reactive power balance degree in partitions, while the power grid is modeled as the weighted network with similarity weight. By introducing the concept of vertex degree and betweenness, a novel pilot nodes selection index is presented , which is based on the ranking of observability and controllability sensitivity and can evaluate the centrality and connection density of node. Applying the proposed index and method to IEEE 39-bus system, simulation results show the effectiveness.
Tracking Performance Optimization of Compensation Current in Active Power Filter
Authors: Li Lan , Cao Xiao Xia , Yang Yong
Published: March 2013

The compensation principle of active power filter is analyzed，and the measurement method of harmonic and reactive current based on instantaneous reactive power theory is proposed．In the control methods of compensation current，aiming at the limitation of PI controller in compensation performance of active power filter，repetitive control is introduced in the tracking control of instruction current，and compound control strategy composed with PI controller and repetitive controller is adopted to affect the output of system．The system model based on compound control strategy is built and simulated by MATLAB/Simulink，The simulation results indicate that after compensation total harmonic distortion of the system is reduced to 1.33%， power factor is reached to 0.99，and the results demonstrate the validity and superiority of the compound control．
Transformer Winding on-Line Monitoring and Diagnosis Using Current Source Method
Authors: Liu Li Peng , Zhu Yong Li , Wang Guo Qiang
Published: March 2013

Transformer winding deformation is a main type of transformer fault. The Frequency Response Analysis is a effective method to detect transformer winding deformation. Based on the traditional Frequency Response Method, the current source method is a new way to detect winding deformation. This method adopts the current source as sweep frequency source and uses the current frequency response curve to judge winding deformation. The simulation shows that the current source method is feasible. For some special transformers, this method can realize transformer winding on-line monitoring and diagnosis.
Integrated Simulation Platform Based on Multi-Source Data
Authors: Sun Jian , Liang Hai Ping , Yang Yu Long
Published: March 2013

The operating departments of power system use different information systems for work convenience. The differences in appliances, data sources, structures and maintenance personnel lead to the independence between data sources as well as heavy workload of data exchange and maintenance. The simulation of different problems needs various tools while the establishment of grid model requires hard work. This paper, on the basis of function requirement analysis, made project design of integrative simulation platform, and developed a data graphical integrated modeling platform featuring the functions of steady state, electromechanical transient and electromagnetic transient with the ability of multi-source data fusion by using the programming language C#. The platform can integrate data of PSDB, PSD-BPA and PMIS, automatically form PSASP and PSD-BPA power flow calculation data, electromechanical transient simulation data and generate “.psc” files for PSCAD\EMTDC electromagnetic transient simulation analysis according to the selected sectors and components on the graphical interfaces.
Atmospheric Corrosion Study on High-Voltage Overhead Power Transmission Line
Authors: Yang Lin , Xia Kai Quan , Liu Fan , Ren Xi Chun , Deng Yuan Shi
Published: March 2013

Influence of atmosphere corrosion on conductor in the high-voltage overhead power transmission line has been paid more and more attention. This paper carries out experimental test research on atmosphere corrosion forms of aged conductor wires through metallographic analysis, electron microscope scanning etc. technologies, analyzing the influence of corrosion on its mechanical performance, which has provided theoretical reference for operation and maintenance of the overhead power transmission line.
The Research of the Internet of Things Technology Applied in Electric Power Communication Equipment Life Cycle Management
Authors: Que Hua Kun , Chen Rui Min , Xiao Yong , Dang San Lei , Yang Jin Feng
Published: March 2013

With the expansion of the scale of power grid, the research of the application technology of the internet of things in power grid becomes more and more pressing. Based on the concept of " the internet of things ",this paper combined the internet of things technologies with resource management, taking on the research of the electric power communication network resources life cycle management system based on the internet of things. This paper introduced the functions of the system structure and design principles, presents system hardware and software architecture, and probed into the method and key technology of EPC reading and writing and database synchronous on the system platform. Based on the method, realizes the effective combination of the internet of things and electric power communication resources management, improving the automation and intelligent level of the electric power communication resources life cycle management. Finally, the specific application example of a power company shows the feasibility and practicability of the system platform.
Reliability Enhancement Test on Undercarriage Signal Light Box
Authors: Zhang Ren Peng , Hu Yi Yong , Yao Jun
Published: March 2013

Based on the theory of failure physics, reliability enhancement test is a test technology of stimulation in order to improve reliability by discovering, researching and curing failure. In this paper, the main factors inducing failure modes of undercarriage light box were analyzed, and the environmental sensitive stresses affecting reliability were determined. The testing program was designed and test profiles were established based on the theory of reliability enhancement test. Additionally, the test results were analyzed based on failures of products in order to carry out improvement measures.
Cloning, Expression and Characterization of a Lipase from Bacillus Subtilis Strain I4 with Potential Application in Biodiesel Production
Authors: Xie Zhen Rong , Zhang Xue Lin , Ding Jun Mei , Li Jun Jun , Yang Yun Juan , Huang Zun Xi
Published: March 2013

A lipase gene from sequencing genomic DNA of Bacillus subtilis strain I4 (I4-2) was cloned and expressed in E. coli. The deduced amino acid (aa) sequences for the lipase I4-2 was composed of 31-amino-acid signal sequence and a 181-amino-acid mature part, corresponding to a molecular mass (Mr) of 19.33 kDa. Based on the Mr and the protein sequence, the lipase I4-2 was belong to the lipase family1.4. The activity of the purified recombinant lipase I4-2 was apparently optimal at 45°C and pH 7.0. The enzyme was stable at 25°C, and more than 56% of the initial activity after incubation in buffer pH 7.0 for 120 min at 37°C. In addition, lipase I4-2 was mixed with methanol (50, v/v) for 30 min and residual activity was 45%. lipase I4-2 can catalyzed biodiesel production from soybean oil at methanol : soybean (molar ratio of methanol to oil = 3:1), 10% n-hexane, 3.5% water. The results of GC–MS analysis demonstrated that a 3-stepwise process resulted in a 98% conversion yield after 8 h of reaction at 37°C.
A Novel Control Strategy Based on Virtual dc Voltage Feedback for an Improved Three-Phase to Single-Phase Matrix Converter
Authors: Zhang Wen Bin , Ge Hong Juan
Published: March 2013

This paper presents an improved topology for three-phase to single-phase matrix converter (3-1 MC), and discusses the power decoupling method, closed-loop control strategy, etc. These studies make the single-output MC have good features, such as sinusoidal input current, low total harmonic distortion (THD), compensating the shortcomings of traditional 3-1 MC caused by the output power pulsation. According to the improved scheme, a novel closed-loop control strategy based on virtual dc voltage feedback is proposed. The strategy completes the closed-loop control of 3-1 MC by taking the virtual dc voltage as outer-loop controlled variable and the input current as inner-loop controlled variable. Consequently, the power factor correction (PFC) of 3-1 MC is achieved, and the control stability is improved. Finally, a series of stimulation and experiments for a prototype with 115V/400Hz output are conducted, the results show that the power decoupling method and control strategy are practically correct and feasible.
Study on the CFBB Main Steam Pressure Control System Based on ADRC Technology
Authors: Zheng Jia Liang , Zhang Li Xiang , Zhang Pei Hua
Published: March 2013

The combustion process of CFBB is a system with time-varying, nonlinear, large inertia and time delay. Therefore the control effects of traditional PID control system in the CFBB plant are not satisfactory , especially the overshoot of the main steam pressure control system is very big, and the adjustment time is too long. To improve the performance of the main steam pressure control system, ADRC technology was used . The disturbed signal was added in the different operating conditions, the testing results indicated that the ADRC main steam pressure control system had more excellent performance than the convention PID method.
A Novel Technique for Eliminating Probe Lift-Off in Eddy Current Nondestructive Testing
Authors: Ye Bo , Li Ming , Zeng Fang
Published: March 2013

The lift-off problem is a very important problem in eddy current testing, which will influence the measurement accuracy. This paper proposes a novel technique for eliminating the probe lift-off in eddy current nondestructive testing. Firstly, the basic principles and characteristics of eddy current testing were introduced. Secondly, this paper analyzed and studied the coil impedance responses caused by the variations of the probe lift-off. Based on simulation results, this paper presents that choosing proper probe excitation frequency can eliminate the disturbance of coil impedance caused by the lift-off, and obtains better results.
A Gait Feature Extraction Algorithm Based on Fusion of Spatial and Frequency Feature
Authors: Zhu Xiao Ke , Chen Xiao Pan , Zhang Fan
Published: March 2013

In order to enhance the accuracy of gait recognition, a new gait feature extraction algorithm is proposed. Firstly, the gait images are preprocessed to extract moving objects, including background modeling, moving object extracting and morphological processing. Secondly, an equidistant slicing curve model based on system of polar coordinate is designed to slice the moving object, and the slicing vector is used to describe the spatial feature; Thirdly, the slicing vector is converted into frequency signal by Fourier transform to extract the frequency feature. Finally, the above two features are fused and used for the classification. The experimental results show that proposed algorithm provides higher correct classification rate than the algorithms using single feature, and meets the requirements of the real-time.
Layered, Partition, Local Equilibrium of Reactive Power Compensation
Authors: Guo Yun Bo , Xu Li Na
Published: March 2013

This paper presents a principle that compensation balance is flexible used in a certain context of the power grid load growth, in order to keep the system voltage stability and system to maximize the economic operation. Some questions are analyzed and demonstrated which.
Design of Power Harmonic Analyzer Based on LabVIEW and HHT
Authors: Wang Xiang Yi , Wang Wei , Chen Wei Min
Published: March 2013

For shortcomings and deficiencies of FFT and Wavelet Transform, Hilbert Huang Transform is used in power harmonic analysis, EMD method is applied to decompose these signals from the timescale of its characteristics to realize adaptive signal of the band, And then the characteristics of frequency and amplitude of each disturbance signal are extracted on the basis of Hilbert transform. Furthermore, the paper designed a data processing platform based on the integrated software LabVIEW and Matlab with NI PXI-1042 as the carrier. The system can analyze and process the power harmonic data in real-time with the calculation of HHT, compared with the traditional analyzer, with simple operation, processing ability, graphics output etc. Experiments have proved the stability, fast calculation capability, and high precision of the system.
Effects of the Laser Power on the Microstructure and Microhardness of the Carbonitrided 45 Steel
Authors: Zhu Hong Mei , Peng Ru Shu , Weng Chao Hui
Published: March 2013

The 45 steel was processed by laser remelting after the carbonitriding heat treatment in this study. The microstructure morphology and microhardness of the laser-remelting layer at different laser powers were investigated by scanning electron microscope (SEM) and microhardness tester, respectively. The results show that a compact microstructure and a homogeneous element distribution can be achieved at the laser power of 1.2 kW under the given other laser parameters, and the microhardness was enhanced greatly.
Influence of TiO2 and Comprehensive Alkalinity on the Viscous Characteristics of Blast Furnace Type Slag
Authors: Gao Yan Hong , Liang Zhong Yu , Bian Ling Tao
Published: March 2013

The viscosity of CaO-MgO-Al2O3-SiO2-TiO2 system blast furnace slag had been measured in present study. And the effect of TiO2 and Comprehensive Alkalinity on the viscosity and activation energy was analyzed. The results showed that TiO2 exhibits amphoteric behaviour. Higher comprehensive basicity is helpful to change complex silicate structures into simple structures.
Experimental Study on Desilication of the High-Phosphorus Hot Metal
Authors: Xiong Wei , Wang Jie
Published: March 2013

In order to promote the rational utilization of high-phosphorus iron ore in western Hubei of China, the effect of process parameters on desilication rate of the high-phosphorus hot metal was investigated. The results show that the desilication rate increases slightly with indistinctive effect with the increasing of desilication agent addition. The oxygen efficiency is over 50% when desilication agent addition is about 30kg/t. Desilication rate is higher when the stirring gas flow is about 0.4l/min. Strengthening stirring of bath at the beginning period can improve kinetics condition of desilication reaction.
The Effects of N2 Flow Rates on the Properties of Ti-Al-Si-N Films Deposited by Arc Ion Plating
Authors: Feng Chang Jie , Xin Li , Zhu Sheng Long , Shao Zhi Song
Published: March 2013

Ti-Al-Si-N films were deposited on 1Cr11Ni2W2MoV steel at different N2 flow rates from 0 to 600 sccm by AIP using a Ti60Al30Si10 target. The effects of the N2 flow rates on the deposition rate, composition, microstructure, microhardness and adhesion property of the films were investigated by SEM/EDS, XRD, microhardness and scratch tests, respectively. The results show that the deposition rate of the films decreased initially and then began to increase at N2 flow rate higher than 300 sccm. The microhardness of the films increased with the N2 flow rate except a slight drop at 450sccm. The evolution of adhesion property of the films was very similar to that of microhardness. All the Ti-Al-Si-N films had B1 NaCl structure with (220) preferred orientation except that at 600 sccm. The effects of the N2 flow rate on the properties of the Ti-Al-Si-N films were discussed.
The Transformation and Optimization to Desulfurizer Preparation System
Authors: Bai Jian Yun , Kong Xiang Jie , Liu Li Hong
Published: March 2013

This paper contraposes the desulfurizer preparation system of Shanxi certain coal-fired power plant existing some problems, which contained too small paticle size of desulfurizer , unreasonable distribution, too low production-to-energy consumption ratio, too weak reliability and so on, and we implemented transformation and optimization scheme to the system, and we transformed the original a set of system into two sets of system. After transforming the system, the particle size of desulfurizer turned larger, and the particle size distribution turned more reasonable, and the production-to-energy consumption ratio increased more than 70%, in additon, reliability of the system turned more stronger.
Effects of Al on the Flat Band Potential of Nanostructured TiO2 Electrodes
Authors: Yang Shu Ming , Zhu Guang Hui , Guo Shu Pei
Published: March 2013

In this paper, Al(NO3)3•9H2O was used as raw material and the nanoparticles of Al-doped TiO2 were prepared by hydrothermal method. The nanoparticles and films were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Ultraviolet and Visible Spectroscopy (UV-Vis). The flat band potential (Efb) of nanostructured TiO2 and Al-doped TiO2 in acetone have been determined with spectroelectrochemistry measurement. The results show that Al doping decreases the energy gap and improves the absorption ability in visible region. On the other hand, Al doping TiO2 can effectively embarrass the crystal growth of TiO2. Specifically, the Efb of TiO2 and Al-doped TiO2 can be determined to be -0.6 V and -0.3V.
Direct Writing Micro-Structure on 65Mn by Femtosecond Laser
Authors: Xu Jian Ting , Yuan Dong Qing
Published: March 2013

Regular line and circle arry micro-apparatus on 65Mn plate formed by femtosecond direct writting with wavelength of 800 nm, repetition rate of 1 kHz and the pulse length of 130fs in air. Investigate the effect of pulse energy and scan speed. Found, that the increased scan speed was similar to the decreased pulse energy. Due to the circle pattern was different to the line process, the contrary phenomenon appeared, which with increased ablation energy, the width of groove was less and the depth was increased.
Measurement of Luminance Coefficients of the Road Pavement for Different Lamp Sources
Authors: Chen Xin , Wu Chun Hai , Zheng Xiao Dong
Published: March 2013

This paper presents the measurement results of the reduced luminance coefficients of an asphalt pavement sample under three common light sources: high pressure sodium lamp (HPS), metal halide lamp (MH), and light-emitting diode (LED), with a specially designed two-dimensional gonioreflectometer. The relative spectral reflectances are obtained with calculation for three different incident angles which indicate light sources with high output in the long wavelength region may be more effective. The measured average luminance coefficient for HPS and MH are 17% larger than that of LED. It means that LED road lamps need higher illuminance than HPS and MH to realize the same brightness for road lighting.
Comprehensive Evaluation Method for the Product’s Disassembly Sequences Based on Information Entropy
Authors: Xue Jun Fang , Zhang Ying Li , Zhang Xin Jian
Published: March 2013

In order to assess product’s disassembly sequences simply and effectively, we present the objective adaptive entropy way, which judge information according to the difference of the evaluation indexes, and get the importance of each evaluation index in the comprehensive assessment of the project (i.e. weight of indexes). So we in turn get the comprehensive evaluation method which is based on the product disassembly sequences of information entropy .This method offers the optimal result and provides the objective weight of each index. So that the designers can improve the relative devises and plan the resource of disassembly. Thereby we can get the best disassembly sequences. At last, taking the example of the 9 kinds of optimal disassembly sequence of a certain type air-condition’s outdoor, we can verify the availability of this method.
Power Grid Business-Oriented Management Tools of Application Service
Authors: Liu Xian Ming , Lin Hai , Zheng Hong
Published: March 2013

The current business application integrated tools only support system level’s integration and management, but this approach doesn’t support application level’s integration and management. For this shortage, we develop an Enterprise Service Bus (ESB) based management tools of application service, which is oriented on power grid business. The tools can manage ESB objects, workflow objects and monitoring objects by combining graphic technology and workflow engineering, so it enhance ESB with more business flexibility. Experiment results prove that the tools are useful in business integration for power grid enterprise.
The Development Present Situation and its Countermeasures about the Solar Energy Industry in China
Authors: Meng Hao
Published: March 2013

Using methods of system analysis and patent analysis, some gratifying progress about the industrial chain, industrial scale, R&D ability, low cost had been made in the solar energy industry in China. But there are some questions such as internal and external challenges, the enterprise innovation ability needing to be improved further, output quality not being high, the emerging and domestic market being yet to be developed etc. Therefore, the effective countermeasures just like strengthening multilateral communication, building the independent innovation system, formulating the strategy of intellectual property rights and developing the domestic and foreign markets are proposed to promote the sustainable development of the solar energy industry.
Context Ontology Modeling for Mobile Petrol Station Recommendation
Authors: Zuo Hui , Ai Dan Xiang
Published: March 2013

To support the personalized mobile recommendation service, a context modeling approach based on ontology was proposed. The role of context ontologies in mobile recommenders was discussed, and under the application background of petrol station recommendation, a two-level context ontology model was designed. The model contains an upper ontology to describe general concepts, and a domain ontology extended from the upper ontology. The context ontology provides formalizations representing the mainly entities including users, objects and contexts, and their interactive relationships in mobile recommendation environments. Finally, a use case of the instantiated context ontology was demonstrated.
Analyzing and Researching of the Economic Utility of Information Resource Configuration Based on Cloud Computing
Authors: Wu Yina , Ma Hui , Chen Lina
Published: March 2013

The amount of investment in the information technology facilities continue to improve, but the use of information resources is far from the desired target and resources are not utilized effectively,. The lower level configuration is gradually emerging. Cloud computing can help improve effective, rational, and scientific use of information resources to promote the information resource utility, thus contributing to the sustainable development of the information industry. The article from the economic point of view, especially from the economic utility and cost saving view, analyze the economic value of cloud computing configuration. Thus, It demonstrate the positive economic value of technological revolution application mode represented by the cloud computing from the point of view of economics.
Research Progress of Methanogens Methanogenic Metabolic Pathway and its Ecological Factors
Authors: Liu Xin Yan , Wei Li , Ma Fang , Huang Xiao Chen , Zhao Zhen
Published: March 2013

Methanogens are important environmental microbial and play an important role in the nature of the carbon-cycling, its unique physiological characteristics and metabolic mechanisms make it play an indispensable role in environmental protection and energy field. At present, known methane biosynthesis has three pathways: acetic acid, H/CO2, methyl compound as the substrates generate methane through different reaction. Ecological factor affecting methanogens are mainly temperature, pH value, redox potential, etc. In this paper, we carry on analyzing the research progress of the methanogens species, its physiological characteristics, metabolic pathway, ecological factor and industrial application, and propose methods and the thinking of study to improve methane gas production by adjusting the ecological factor as the control factor.
Research and Design of AVS Video Decoder Bit Rate Control
Authors: Xiong Jiang , Yi Qing Ming , Shi Min
Published: March 2013

In common video compression coding technology, data with changing bit rate is not suitable for transmission in fixed bit rate channel. A bit rate control algorithm and a hardware design suitable for AVS decoder are proposed in this paper. The target bits are calculated and allocated in three levels, including GOP, frame and MB. The proposed hardware design passes the simulation verification. The result of synthesis in DC proves that the design meets timing requirements. The design is easy to realize and suitable for controlling the bit rate in real-time encoding.
Research on Building the Standard System of Modern Agriculture Information Resources Classification and Coding
Authors: Zhou Qing , Lai Lu Yan , Gu Fa Hui
Published: March 2013

A standard system of information classification and coding covering the entire modern agriculture funding chain, logistics chain and chain is proposed, which includes a unified standard system framework of modern agriculture information classification and code, the agricultural information classification and coding object decomposition table and the agricultural information code structural model based on unified messaging organization, it provides the idea to establish unified modern agriculture information codes.
Risk Identification and Evaluation of Customs Management Based on Fuzzy Neural Network Algorithm
Authors: Duan Jing Hui
Published: March 2013

By using fuzzy-neural network algorithm, this paper empirically studied the customs management risk in China. Our research process is summarized as follows: firstly, we describe the situation and development trends of customs management risk; secondly, we employ fuzzy artificial neural network algorithm to establish a conversion mechanism model; finally, we test the effect of this model according to related customs risk management information.
The Development and Improvement of China’s Golden Taxation Project
Authors: Cheng Kan , Luo Jing
Published: March 2013

China launched the Golden Taxation Project(GTP) in March 1994. The promotion of GTP is beneficial to reform of tax collection and regulation. It mandates the use of specific sophisticated information technologies to improve compliance with China’s Value Added Tax (VAT) laws. In this paper, we illustrate the development of GTP in detail, and make the analysis of the existing questions in the current operation. Then through the compare with the 1989 tax informational reform of America, we give some advice to our GTP Phase III in progress.
Rapid Prototyping Machine in Teaching Practice and Application
Authors: Li Wei Wei , Yu Lei
Published: March 2013

In order to adapt need of market economy development,to shorten the product development cycle,improve the ability to manufacture complex parts,rapid prototyping manufacturing technology to become a new direction in the development of the manufacturing industry,many colleges and universities have carried out the rapid prototyping manufacturing research, mechanism, material professional college students will become the main force to promote technology applications.Will therefore rapid prototyping machines used in teaching training segment, to standardize the experimental behavior of the students, played an important role in the overall quality of training of students and improve ability.
Green Education Project Evaluation and Development Path under Low-Carbon Context
Authors: Chen Jia Nan , Yin Jun Ya , Deng Ning Dan
Published: March 2013

This Environmental problem is of common interest currently, and it is vital to the human development in the future. According to the research situation and its disadvantage, this dissertation emphasizes the importance of green environment awareness in the environmental protection, the importance of green education project on the cultivation of environmental awareness, as well as the important role played by colleges and universities. This dissertation sets up a system of green evaluation indexes, and presents an evaluation model based on the fuzzy analytic hierarchy process (FAHP).
On Synergy of Management Innovation and Technological Innovation of Enterprise, University and Research
Authors: Jin Gao Yun
Published: March 2013

The cooperative technological innovation of enterprise, university and research has received more and more social attention, but in the process of cooperation, it may also cause many problems that cannot reach the final goal of cooperative technology innovation. The reason is that we always neglect the cooperation with the management innovation in the process of technology innovation. Based on the Synergy Theory, this paper analyzes the cause of cooperation of enterprise, university and research, from the economic and management aspects. What is more, the paper researches and analyzes the synergy mechanism of the technology innovation and management innovation, and explains the management innovation is the important guarantee and realizing way of technological innovation.
Technology Sophistication and Industrial Diversification are the Key for Global Manufacturing Competitiveness
Authors: Abdulla Abdulla Rashid , Zhao Hongzhong
Published: March 2013

Manufacturing is considered to be a driving force of any country’s economic development by creating more employments and social income. However, in this era of rapid technological change every country struggling to increase more market shares and to remain competitive in the international scene. In this study we tried to analyze the competitiveness of small countries and island economies by using United Nations Industrial Development Organization (UNIDO) methodology. Nevertheless, the study support the notion that while giant struggling to maintain their position the miniature are kicked out by rapid losing their manufacturing capability and hence decreasing the market share.
Comparative Studies on the Efficiency of Solar Flat-Plate Collector and Evacuated Tube Collector
Authors: Yan Hui Lei , Zhang Hua , Shao Qiu Ping
Published: March 2013

Solar collectors are the key components of solar thermal utilization. The comparative tests of solar flat-plate collector (SFPC) and heat pipe evacuated tube collector (HPETC) were done in this paper. The results show that during the low temperature difference range, the heat collecting efficiency of the flat-plate collector is about 2.3 times higher than the efficiency of the heat pipe evacuated tube collector and the heat loss of the flat-plate collector is about 3.2 times bigger than that of the heat pipe evacuated tube collector. Through the analysis, two measures are proposed to improve the efficiency of flat-plate collector and reduce the heat loss in order to make it more efficient in the solar heat pump system.
Evaluating Construction Workers’ Understanding of Safety Signs
Authors: Kim Gwang Hee , Nam Seok Hoon , Hwang Sang Jun , Choi Hee Bok , Shin Yoon Seok
Published: March 2013

It has been suggested that many construction workers are never properly educated on the meaning of safety signs. In particular, considering that any safety accident can lead directly to a serious disaster, understanding safety signs is a critical part of safety management. Therefore, the purpose of this study is to analyze construction workers’ awareness of and understanding of safety signs. The research found that most construction workers perceived that safety signs play an important role in preventing safety accidents. However, almost half of construction workers did not understand what construction safety signs convey, which indicates an urgent need for education on safety signs at construction sites.
Study on States and Development of ESD in China - Sustainable Development as Strategic Aim for Higher Education
Authors: Yuan Fang Yao , Wang Bin , Ji Ming Chuan , Yang Ping
Published: March 2013

This study explains the status on ESD of HEIs in China by introducing the basic information，important activities and related problems on ESD, discusses the urgent needs of development on ESD, and put forward the proposals to related organizations and institutions.
Is Cornstalk a Best Substitute for Corn in Bioenergy Production in China?
Authors: Yan Yun Xian
Published: March 2013

The scarcity of the fossil fuels and the large amount of energy consumption in the world trigger the development of bioenergy. Bioenergy is friendly to the environment and could benefit the human being and the whole society. This paper analyzes the cornstalk processing for the bioenergy in China. It explores the feasibility of the cornstalk using in the bioenergy production from the supply side and the demand side. The effects of the cornstalk used for bioenergy production are investigated. Finally, the conclusion is made that the cornstalk is a best substitute for bioenergy production in China.
Optimal Physical Pretreatment Conditions for the Release of Carbohydrate and Protein from Dairy Manure
Authors: Sun Jian Ping , Zhu Jun
Published: March 2013

Various physical factors including particle size, pH, temperature and so on may influence the release of organic materials from dry dairy manure. The effect of these factors on release of protein and carbohydrate was investigated in this study using Box-Behnken Experimental Design with three factors (particle size, temperature and pH) at three levels. Test results suggested that particle size of 0.15-0.25 mm accounted for almost half of the dry manure particles and the optimum condition for release of protein and carbohydrate were pH 2, particle size 1.0-1.4 mm under reaction temperature of 90 oC, under which the protein and carbohydrate release rates could reach 1570.57 and 2813.29 mg l-1, respectively. The degree to which these factors affected organics release was in the order from high to low of temperature > particle size > pH.
Experimental Investigation on NOX Emission and Combustion Characteristics of South China Typical Biomass
Authors: Song Jing Hui , Liao Yan Fen , Fan Zhi Gang , Wu Shu Mei , Ma Xiao Qian
Published: March 2013

Eucalyptus broken wood, eucalyptus bark, sugar cane leaves and bagasse as the representative of South China typical biomass have been investigated by experimental study. The experimental study was carried out to study the devolatilization law and the fixed carbon burning law, also the NOX emission characteristics. The experiments showed that the influence of temperature on combustion, especially in the initial stage of combustion, the weight loss rate difference were up to 60%. The NOX emission experiments showed that the NOX emission of eucalyptus bark was the maximum in 700°C combustion.
Application of Super-Capacitor in Grid-Connected Photovoltaic Power Generation System
Authors: Jiang Zhe , Yin Zhong Dong
Published: March 2013

The impact of grid-connected photovoltaic power on power quality and reliability of power supply has gained more attention, with the continuous improvement of its generation capacity. This paper describes the power conditioning system of grid-connected photovoltaic power plants based on super-capacitor energy storage, which acts as the energy storage element to stabilize fluctuations in output active power of photovoltaic power generation system. Based on the configuration and principle of the power control system, a power and current double closed loop feedback hysteresis current control strategy is proposed in details, which controls the super capacitor energy storage system to absorb and complement the active power output fluctuations of the photovoltaic power generation system. The effectiveness and good operating performance of the device and control strategy are validated by simulation with PSCAD/ EMTDC.
Research on an Improved Control Strategy for Enhancing LVRT Ability of DFIG System
Authors: Meng Yan Feng , Hu Shu Ju , Xu Hong Hua
Published: March 2013

Aiming at operation problems of DFIG under grid fault condition, the improved control strategy of coordinating control rotor converter and Crowbar circuit switching logic for enhancing LVRT ability is proposed. The over-current cause on the stator and rotor of DFIG under grid fault is analyzed and complete improved control strategy flow chart is given during entire voltage dip. Experimental verification results show that adopting this improved control strategy can effectively suppress the generator stator and rotor over-current and over-voltage, enhance wind turbine operation ability, and provide important theoretical basis and reference for large-scale wind turbine to respond to grid transient fault.
Probabilistic Assessment of Wind Farm Active Power Based on Monte-Carlo Simulation
Authors: Wang Xin Wei , Zhang Jian Hua , Jiang Cheng , Yu Lei
Published: March 2013

The conventional deterministic methods have been unable to accurately assess the active power output of the wind farm being the random and intermittent of wind power, and the probabilistic methods commonly used to solve this problem. In this paper the multi-state fault model is built considering run, outage and derating state of wind turbine, and then the reliability model of the wind farm is established considering the randomness of the wind speed, the wind farm wake effects and turbine failure. The active wind farm output probability assessment methods and processes based on the Monte Carlo method. The related programs are written in MATLAB, and the probability assessment for active power output of a wind farm in carried out, the effectiveness and adaptability of built reliability models and assessment methods are illustrated by analysis of the effects of reliability parameters and model parameters on assessment results.
Some Controlling Strategies of DFIG to the Grid Turbulence
Authors: Wang Huan , Pan Lei
Published: March 2013

The paper introduces several methods about controlling strategies of DFIG to the gird turbulence. They could reduce the torque pulsation. They have better dynamic adjustment performance than the positive, negative sequence dual current control strategy. Stator current THD is well controlled. The experimental results show that it can smooth the DFIG active power output comparing with the traditional maximum wind energy tracking control strategy, significantly reduces the speed fluctuation of synchronous generator. The dynamic performance is improved.
Analysis on Public Participation in Decision-Making of Nuclear Power in China
Authors: Wu Yun Na , Naren Mandula , Han Yi Li , Wang He Ping
Published: March 2013

In recent years, like many people from other countries, the Chinese people pay close attention to nation’s development and policy of nuclear power, especially after the Fukushima incident. Furthermore, the concerns become exacerbated with the discussion about building the inland nuclear power plant. At the same time, the enthusiasm of the public participation which has its own characteristics has greatly improved in China. There is limited experience in the field of nuclear power decision-making in China. In this context, this paper comprehensive analyzes the Chinese public participation in decision-making of the nuclear power industry, summarizing the characteristics of public participation in this field. Then a typical case analysis with On-site visit and interview is made for verifying our theory. Based on these studies, some suggestions are put forward.
Concern on the Sustainable Development of China Nuclear Power Emergency Treatment after the Japan Fukushima Nuclear Crisis
Authors: Hou Hui , Li Zheng Tian , Ye Lei , Yang Xiao Ling
Published: March 2013

After the Japan nuclear power crisis in 2011, main nuclear power countries and international organizations reactions to nuclear emergency and security problem had become a hot topic. The global concern on power emergency problem after the Japan Fukushima nuclear crisis was reviewed comprehensively. The International Atomic Energy Agency (IAEA) investigation, the U. S. NRC Security Check, EU stress test, and France ASN complementary safety assessment results were stated in detail. As an important source of power, China’s altitude toward the sustainable nuclear power development and safety was also surveyed. The main nuclear power countries all claimed their position to insist on the development of nuclear power while taking lessons from Japan Fukushima nuclear crisis. Finally some comments and suggestions to improve China’s power industry emergency response and drills system to support the sustainable development of nuclear energy were proposed.
Flow Field Model Experiment Studies of a Bipolar Plates PEMFC
Authors: Jiang Bing Kun , Ji Xin Jie , Li Yong Zhong
Published: March 2013

The mode experiment is respectively done under condition of different amount of gas supply, different shape of gas admission room, different cross-section shape of flow channel. Results show that pressure descend of U shape cross-section slot is smaller than the rectangle cross-section slot in the equal fault stream section situation, so flow distribution characteristic of U shape cross-section slot is better. The experiment results are consistent with numerical simulation results. In addition, numerical simulation results also indicate that the mass of gas diffusing from U shape cross-section slot to the diffusion layer is over greater, and U shape cross-section flow channel has a higher gas utilization ratio.