bluuebunny/crossref_metadata_2025 huggingface dataset:
Secure Transmission Model Technology Scheme of Massive Train Information
Authors: Chen Na , Chen Jin Hui , Zhong Fei , Dong Hong Hui , Gao Yi Fan
Published: February 2014

Secure Transmission Model of massive train information is mainly to cater for train-ground information transmission system, to solve the high reliability and high security issues of massive moving train data. Secure Transmission Model technology scheme of massive train information includes software solutions and hardware technology solutions.
Research on the Magnetism of Yttrium Doped Zinc Oxide Film
Authors: Lan Zhi Huan , Miao Xiu Juan
Published: February 2014

The magnetism of Y doped ZnO film was calculated by using an accurate full-potential linerized plane-wave and supercell method. To analyzing the results, we find that: The ZnO film containing Zn vacancies is magnetic and the origin of magnetism is Zn vacancies; The Y ions in Y doped ZnO film is +3 and non-magnetic; The formation energy of Zn vacancies in the Y doped ZnO film is smaller than in the ZnO film, so Y favors the formation of VZn; The Y doped ZnO film containing Zn vacancies is magnetic.
The Dynamic Collection of Detection Data Based on Priority Assignment and Slicing Sequence
Authors: Tang Jun Qing , Liu Jing , Gong Xiao Cong , Dong Hong Hui , Gao Yi Fan , Teng Zhi Wei
Published: February 2014

Large-capacity vehicle transmission technology, including dynamic collection of the detection data, has an important significance on the safety detection of the city rail train which is related to the safety of rail transit operation. On the basis of the classification and priority assignment of the detection data, this paper adopts slice sequence dynamic extraction algorithm to establish the information transmission priority queue.
Ultraviolet Laser Induced Damage Characteristic of SiO2 Single Layers
Authors: Sun Wei , Qi Hong Ji , Fang Zhou , Yu Zhen Kun , Li Hai Yuan
Published: February 2014

Surface and subsurface defects of optics are of major concern in improving laser induced damage threshold. SiO2single layers were fabricated by physical vapor deposition and sol-gel technique on fused silica substrates. HF acid etching and ultrasonic cleaning process are used to investigate the effect of surface and subsurface defects of substrates on the laser induced damage threshold (1-on-1, 8 ns at 355nm). Experimental data are then fitted with the Gaussian model of threshold distribution, which permits to discriminate different kinds of defects and extract their densities and threshold distribution. The interpretation of these data is further discussed according to their cleaning and fabrication method.
The Algorithm for Data Mining Frequent Patterns over Sliding Window
Authors: Zhao Xiao Lei , Huang Wei
Published: February 2014

On the basis of the shortcoming of the existed algorithm, this paper probes into sliding windows pattern and introduces an efficient algorithm for data mining frequent pattern over sliding windows. A PSW-tree pattern is set in the algorithm to store frequent and critical pattern in data mining. On this basis, the paper presents a rapid mining algorithmPSW algorithm. In the experiment IBM data generator is used to produce generated data, which proves the validity and better space efficiency of the algorithm.
Wide-Area Backup Protection Algorithm Based on Earth Impedance Comparison Principle
Authors: Li Zhen Xing , Li Qiu , Zhang Tao
Published: February 2014

A novel algorithm is proposed for the purpose of improving the reliability and sensibility of fault component identification of wide area backup protection. The algorithm, called earth impedance comparison protection (EICP), is realized by comparing the ratios of different nodes, and the ratio is obtained by the bus voltage to the differential current. The advantages of EICP are verified in this paper using the measurement function of wide-area measurement system. The results of case studies show that EICP is superior to the current differential protection in terms of the sensitivity and to the directional pilot protection in terms of the dependability. The satisfactory results can be obtained when the EICP method is applied in the event of abnormal operations of protective relays and circuit breakers, measurement error scenarios or substation DC failure.
Synthesis and Characterization of an Amphiphilic Nanoparticles Based on Chitosan Oligosaccharide-Grafted-Polycaprolactone
Authors: Li Feng Hong , Zhang Wen Jing , Li San Xi , Chen Yan Ming , Zhang Xin Rui
Published: February 2014

The amphiphilic chitosan oligosaccharides graft copolymer (PHCSO-g-PCL) was synthesized via ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) through an amino group protection route using phthaloyl chitosan oligosaccharide (PHCSO) as intermediate. The graft reaction was carried out in Pyridine at 120 °C with a chitosan oligosaccharide (CSO) initiator and a tin 2-ethylhexanoate (Sn (Oct)2) catalyst. The amphiphilic PHCSO-g-PCL nanoparticles were prepared through the self-assembled in DMF organic solvents. PHCSO-PCL copolymer was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The physicochemical properties of the hydrophobized PHCSO-g-PCL nanoparticles were investigated by using dynamic light scattering (DLS). The results of DLS showed that the hydrodynamic diameters and particle size distribution with various concentrations of PHCSO-g-PCL nanoparticles were from 69.82 nm to 195.9 nm with a narrow polydispersity factor of 0.212 to 0.172.
Large Capacity Cache Design Based on Emerging Non-Volatile Memory
Authors: Bu Kai , Liu Hai Jun , Xu Hui , Sun Zhao Lin
Published: February 2014

A triple-level-cell (TLC) STT-RAM architecture was proposed basing on parallel MLC MTJ and serial MLC MTJ. A TLC STT-RAM cell can store three bit which will offer higher capacity density compared with SLC STT-RAM. The write process is also analyzed that it contains three types of basic states transitions. Through mapping soft, medium and hard domains to three individual cache lines, the access to soft lines can perform as accessing SLC STT-RAM-based cache. The amount of three-step operations is also much reduced. .
A Cross-Domain Access Control Method for Large Organizations
Authors: Wang Chao , Chen Ji Zhou , Liu Yu Jun , Li An Qi
Published: February 2014

In order to eliminate the security threats faced by the information systems of large organizations which usually involve multiple autonomous domains, this paper introduces an architecture of access control collaboration, which takes a distributed authoritative domain as the leading core of the unified cross-domain access control. Through applying the ABAC model in the authoritative domain, the global strategies formulated by the authoritative domain can be compatible with those local strategies of each autonomous domain. The global strategies are designed to be described by a group of authoritative attributes, which are limited in quantity but adequate to generalize all the subjects within the global scope. For system realization, a rule-based dynamic mechanism of attributes conversion is used to automatically generate the information of authoritative attributes. The cross-domain access control method in this paper can be directly applied to typical large organizations, such as government, military and large enterprises.
Attribute Clustering Based Collaborative Filtering
Authors: Zhang Liu Mei , Ma Jian Feng , Lu Di , Wang Yi Chuan
Published: February 2014

The paper proposed an attribute clustering based collaborative filtering algorithm for recommendation. It utilizes similarity to filter out redundant attributes by feature selection. Then by incorporating K-Means clustering, it is able to effectively solve the rating scale problems existing in the traditional collaborative filtering recommendation algorithm. The algorithm is verified by real data sets. Experiments use location information for clustering the restaurant data. By integration of users rating on restaurant service and external impression the experiment study combined the collaborative filtering philosophy to provide recommendation service for users. Experimental results show that compared with the item rating based recommended algorithm, the algorithm has ideal recommended quality and improved accuracy, and then it has reduced the data sparsity.
Game Optimization for RSA Signature Scheme
Authors: Wang Yi Chuan , Ma Jian Feng , Lu Di , Zhang Liu Mei
Published: February 2014

Security and efficiency for using RSA signature scheme are critical requirements for many network applications. In this paper, we present a Game Model for RSA Signature Scheme (GMRS). By analyzing our model with information and game theory, we prove that the Nash-equilibrium is existent in GMRS. Accordingly, we propose an optimization scheme for updating the private key. The experiment result shows that, our scheme can significant promote the efficiency and ensure the security, even in the lowest risk-level case and for an adversary with unlimited computing power.
Research of Multiple Constrained Qos Routing Based on Improved Ant Colony Algorithm
Authors: Gong Yue , Wang Jia Nan
Published: February 2014

This paper mainly discusses the Multiple Constrained Qos Routing Algorithm, in the analysis of the basic on the basis of mathematical model of Qos routing. It has proposed a routing model with an objective function, integrated optimization of multiple Qos constraints. Finally, the optimization of ant colony algorithm applied to solve the problem of multiple constraints Qos. Through simulation experiments proved that the algorithm to find the path to maximum degree meets Qos requirements.
Analysis on Random Response of a Simply Supported Beam Subjected to Distributed Load
Authors: Li Xiao Jing
Published: February 2014

The random vibration of simply-supported beam is simplified of the random vibration of the SDOF theory ,the paper analyse its random response. We get the displacement power spectral density function the velocity power spectral density and the acceleration power spectral density function of the maximum displacement point. The same example is calculated by ANSYS, it also get the same results.It proved that using the finite element analysis software ANSYS to anlaysis the random vibration of the simply-supported beam has advantages of fast speedhigh precisioneasy stepsthe small error and so on..
A New Inlet Boundary Conditon for LES
Authors: Liu Zhe
Published: February 2014

It is known that the inlet boundary condition is still a problem for tubulence simulation. In this paper a numerical procedure to generate inflow turbulence based on the digital filter technique (Autoregressive Moving Average (ARMA) model) is presented suitable for Large Eddy Simulation (LES) models and validated to realize the inflow turbulence and this approach is adopted to investigate the flow characteristics in the empty domain based on standard and dynamic LES models.
Numerical Stimulation on the Seismic Wave Attenuation in Random Inhomogeneous Media
Authors: Yang Ning , Qian Xu
Published: February 2014

Numerical stimulation was utilized to study the seismic wave attenuation in random medium. The main reasons of attenuation in elastic media were the spherical divergence and scattering wave caused by in homogeneities with variant scales. The elastic wave attenuation in random media cannot be analyzed by analytic method, so the numerical stimulation was the only way to discuss the problem. Rotated staggered finite difference method was chose to stimulate the situation. 6 random media were constructed with different correlation length. Numerical Stimulation was implemented in them, and particle displacements in certain locations were record. These records were compared with the ones in the corresponding homogeneous media to discuss the attenuation.
The Corrosion Behavior of Rebar in Stressed Mortars
Authors: Feng Xing Guo , Lu Xiang Yu , Liao Ying Di , Jiang Chao Hua
Published: February 2014

The corrosion behavior of stainless steel and carbon steel in the mortars suffered stress is studied by electrochemical tests. The results show that the corrosion of rebar is accelerated as the magnitude of stress increasing. Under the same stress magnitude, compressive stress more seriously degraded the corrosion resistance of rebar than tensile stress in mortar in an aggressive environment.
Multi-Phase Dielectric Model of Blood and its Application
Authors: Li Gun
Published: February 2014

The dielectric property of biological tissue is one of the important electrical properties, which vary with the internal structure, including a variety of electrolytes, macromolecules and different kinds of cells. This paper established a relative dielectric model of blood to explore the dielectric properties of biological tissue, the results show that characteristics of blood is vary with frequency and its composition, and the study could be a theoretical basis for further study on electrical properties of biological tissue.
An Improved Genetic Algorithm for Landing Gear Load Measurement by Eliminating Redundancy
Authors: Zhao Yan , Li Zhi Rui , Jiang Qi Deng
Published: February 2014

An improved genetic algorithm for determining landing gear load was proposed by considering the elimination of the redundant strain gages. Exhaustive search (ES), genetic algorithm (GA) and improved genetic algorithm (IGA) were compared for building load equation of certain landing gear. Also, the sensibility of IGA to parameter K was analyzed. The results show that the validation errors of load equations from 3 methods are almost comparable, while the redundancy from IGA is less than those from ES and GA, and IGA is not very sensitive to parameter K between 0 and 1.
Study on Design and Construction of Reaction Mass of Earthquake Simulation Triple Shaking Tables
Authors: Huang Fu Yun , Fang Zi Ming , Li Jian Zhong , Wu Qin Xiong
Published: February 2014

The feasibility of design and construction for the reaction mass of earthquake simulation multiple shaking tables is important component in the whole system, and can directly determine the working performance of shaking tables. The characteristics of design and construction for the reaction mass of earthquake simulation triple shaking tables at Fuzhou University were introduced and analyzed. The requirements for the reaction mass should be having huge mass and stiffness, large strength and precision, as well as having negligible effect to the ambience. It is expected that the introduction will benefit the design and construction of the multiple shaking table facilities.
Research of Speed Regulating System Based on New Fuzzy PI Control
Authors: Wang Hui , Wan Li Rui , Wang Cai Dong
Published: February 2014

In order to further improve on the static and dynamic performance of the permanent magnet linear synchronous motor (PMLSM) speed regulating system, the traditional PI control is combined with the fuzzy control to achieve PI parameters self-regulating. In this paper, on the basis of studying the mathematic model of PMLSM, the resisting integral saturation method are adopted to eliminate the integral saturation which the traditional PI causes. the fuzzy control is introduced into the PI control to realize to the self-optimization of the PI parameters. The simulation results show the resisting integral saturation PI control system based on the fuzzy control algorithm has better static and dynamic performances and stability, and possesses stronger anti-strike performance. Therefore, the new control system resolves the problems which the traditional PI controller cant achieve the most optimization because of the difficulty of the parameter regulating.
Safety and Reliability of Wireless Charging System for Electric Vehicles Based on the Yunnan Power Grid
Authors: Wang Hong Liang , Liu Juan , Cao Min , Chen Xian Fu , Wang Da Da , Zhang Shao Quan
Published: February 2014

Electric cars are emerged as the energy crisis and environmental problems have become more severe. Electric vehicles charging include contact and non-contact. The battery technology has not been solved absolutely for Contactless charging, in addition, charging pile construction will take up a lot of urban land, normal charge is slow, fast charge will have a huge impact to grid, the high cost of change the batteries, these drawbacks of electric vehicles has been hampered the large-scale development of EV. With the development and gradual improvement of wireless power transmission technology .wireless charging technology applied to electric vehicles has great prospects. In the wireless power charging process safe, reliable transmission is very important. In this paper, security and reliability problems have been discussed for the various aspects of wireless charging systems and combined analysis of the characteristics of Yunnan Power Grid for wireless charging systems of electric vehicles.
Empirical Likelihood Testing for Longitudinal Varying Coefficient Models
Authors: Liu Chang Qing
Published: February 2014

By using the empirical likelihood method, a testing method is proposed for longitudinal varying coefficient models. Some simulations and a real data analysis are undertaken to investigate the power of the empirical likelihood based testing method.
Research on Virtual Experiment Teaching Oriented to Innovative Ability Cultivation in Mechanical Engineering Curriculums
Authors: Yi Jian Gang
Published: February 2014

In view of the existing problems in traditional experiment teaching of mechanical engineering curriculums of high school, the method of virtual experiment teaching is proposed in this paper, which aims at developing students creative thinking and enhancing their innovation ability. According to the two aspects of the teaching method and its realization, the various experiments are designed based on virtual design and computer simulation. The results show the proposed virtual experiment teaching method improves students' creative thinking, stimulates students' enthusiasm and creativity, enhances students' overall understanding on mechanical system, and has received good learning effect.
Effect of FWD Testing Position on Modulus of Subgrade Reaction
Authors: Shoukry S.N. , William G.W. , Riad M.Y. , Prucz J.C.
Published: February 2014

This paper discusses the variation of the Modulus of subgrade reaction (k) backcalculated from slab deflection basins, interactive with the location of the Falling Weight Deflectometer (FWD) load pulse, and curling of slabs due to daily temperature variations. The k-value was calculated following the AASHTO design guides procedures, while deflection basins were recorded at an interval of 3 to 4 hours along the day on an instrumented concrete pavement test section in West Virginia. The state of deformation of the slabs are continuously monitored, through dowel bar bending measurements and records of the temperature gradient profiles through the slab thickness, as well as joint openings every 20 minutes. The results indicated that the backcalculated k-values are greatly affected by the positive temperature gradient, and the least variation in (k) was found in the slab center. In order to minimize errors in back-calculations of k-values, it is recommended to perform the FWD test for recording deflection basins in the interior of the slab during late evening or in the early morning.
GPU Accelerated Reconstruction in Compton Scattering Tomography Using Matrix Compression
Authors: Yu Yu Fei , Yan Bin , Wang Biao , Li Lei , Han Yu , Xi Xiao Qi
Published: February 2014

An acceleration strategy for TV-ADM reconstruction algorithm in Compton scattering tomography (CST) is proposed. By analyzing the sparse characteristic of CST projection matrixes, firstly, the sparse matrix vector CSR format and ELL format are used to store them, which greatly reduce the memory consumption. Then, a Sparse Matrix Vector multiplication (SpMV) method is utilized to accelerate the projector and back projector process. Finally, based on the parallel features, the TV-ADM is computed with Graphics Processing Unit (GPU). Numerical experiments show that the TV-ADM with the presented acceleration strategy could achieve a 96 times speedup ratio and 224 times memory compression ratio without precision loss.
A Dynamic Back-Off Algorithm in Ad Hoc Networks
Authors: Wang Chen
Published: February 2014

Much work has been done to solve the unfairness problems caused by hidden terminals and exposed terminals in Ad Hoc networks. The back-off mechanism is one of the widely used methods to ensure the fair allocation of channel resources associated with other mechanisms. In this paper, a modified back-off algorithm DEIED (Dynamic Exponential Increase and Exponential Decrease) is proposed based on the previous back-off scheme EIED (Exponential Increase and Exponential Decrease), and a comparison of BEB (Binary Exponential Back-off), EIED, DEIED, is presented. Both qualitative analysis and simulation results show that the proposed back-off algorithm scheme outperforms EIED and BEB algorithms in term of the opportunities given to each node to transmit.
The Web Foreign Language Teaching Research Based on P2P Technology
Authors: Wang Yi Fei
Published: February 2014

The author analyzes the traditional foreign language teaching website system structure and function, and points out the weakness of its client/server network computing model. By using the Peer to Peer (P2P) system, we can make full use of every online node computing power and communication bandwidth; we can provide better online communication resource sharing among students, teachers, students and teachers. This paper proposes a foreign language teaching system based on P2P, which can effectively make up for the inadequacy of traditional teaching website. We can also explore the application of P2P technology in multimedia network teaching.
An Attribute Mapping Technique for Secure Interoperation in Multi-Domain Environments
Authors: Lu Jian Feng , Yan Xuan , Liu Yi Ding
Published: February 2014

Role mapping is a basic technique for facilitating interoperation in RBAC-based collaborating environments. However, role mapping lacks the flexibility to specify access control policies in the scenarios where the access control is not a simple action, but consists of a sequence of actions and events from subjects and system. In this paper, we propose an attribute mapping technique to establish secure context in multi-domain environments. We first classify attributes into eight types and show that only two types of attributes need to be translated. We second give the definition of attribute mapping technique, and analysis the properties of attribute mapping. Finally, we study how cardinality constraint violation arises and shows that it is efficient to resolve this security violation.
Routing Methods and Scheduling Patterns in MIMO WMN Virtual Model
Authors: Cao Zhan Mao , Tang Jian Chao
Published: February 2014

Multi-input multi-output wireless mesh networks (MIMO WMNs) act as backbone broadband networks for ubiquitous access. Topology model is a crucial factor in interference avoidance, simplifying channel allocation, and discussing optimal scheduling and routing. Cartesian product of graphs (CPG) is introduced for MIMO WMN as a virtual topology. By putting orthogonal channels into different channel layer meshes, some conclusions are explored on channel allocation, routing and scheduling. A path coherent realization is composed of combinatorial edges over multiple channels for all hops. Some important property propositions in CPG are also given, such as path hops with node address and path number counting. Practical mesh node addressing scheme and path number counting theorems are useful virtual topology properties.
Research of Improved Network Access Authorization Mechanism Based on Elliptic Curve
Authors: Wang Fei , Wang Yu , Tian Yuan
Published: February 2014

Currently, the generic WLAN authentication protocols have the problem of low security intensity, or the problem of only one-way identification. It cannot completely adapt to the wireless LAN access certification requirements, under the condition of high security. The article analyzes the disadvantage of WAPI protocol, and then puts forward a kind of improved WLAN access authentication mechanism. It implements the mutual authentication, privacy protection, and also it can resist man-in-the-middle attack and impersonation attack. It fulfills the requirement of wireless terminals security access. The effect on security and efficiency is analyzed.
Study of Network Public Opinion Classification Method Based on Naive Bayesian Algorithm in Hadoop Environment
Authors: Xu Jian , Ma Bin
Published: February 2014

In the light of the excellent distributed storage and parallel processing feature of hadoop cluster, a new kind of network public opinion classification method based on Naive Bayes algorithm in hadoop environment is studied. The collected public opinion documents are stored locally according to the HDFS architecture, and whose character words are extracted paralleled in Mapreduce process. Thus the naive Bayesian classification algorithm is parallel encapsulated on cloud computing platform. The MapReduce packaged Naive Bayesian classification algorithm performance is verified and the results show that the algorithm execution speed are significantly improved compared to a single server. Its public opinion classification accuracy rate is more than 85%, which can effectively improve the classification performance of network public opinion and classification efficiency.
Accurate Location in Batch Dynamic Provable Data Possession
Authors: Li Ming Chu , Zhang Liang , Guo Cheng
Published: February 2014

The paper focused on the construction of an efficient DPDP for public audit. We improved the existing proof of storage model by manipulating authenticated skip list structure for authentication. We further explored embedded MHT structure helping our scheme to accurate locate the incorrect part in batch auditing. Extensive security and performance evaluation showed the proposed model is highly efficient and a nice trade-off between robust construction and storage cost.
Research on Parallel Yen Algorithms on GPUs Using CUDA
Authors: Li Jian Fu
Published: February 2014

With the arrival of the intermodality era, to design fast and efficientKshortest paths (KSP) algorithms becomes gradually one of the core technologies in traveler information systems.Yenis a classical algorithm for KSP. However,Yenis time-consuming. In view of powerful general-purpose computing capabilities, GPU(Graphics Processing Units) has received increasing attention in various fields. Based on CUDA software development environment, combined with the structure of theYenalgorithm itself, this paper proposed two parallel algorithms forYen. The first parallel algorithm computes candidate shortest paths for very possible deviation nodes in parallel. The second one computes candidate shortest paths in serial, but computes very candidate path in parallel. Finally, the efficiency of the two parallel algorithms was tested through experiments.
Parallelization Analysis of Dissolved Gases in Transformer Oil Based on Random Forest Algorithm
Authors: Wang De Wen , Sun Zhi Wei
Published: February 2014

Dissolved gas analysis (DGA) in oil is an important method for transformer fault diagnosis. This paper use random forest parallelization algorithm to analysis the dissolved gases in transformer oil. This method can achieve a fast parallel fault diagnosis for power equipment. Experimental results of the diagnosis of parallelization of random forest algorithm with DGA samples show that this algorithm not only can improve the accuracy of fault diagnosis, and more appropriate for dealing with huge amounts of data, but also can meet the smart grid requirements for fast fault diagnosis for power transformer. And this result also verifies the feasibility and effectiveness of the algorithm.
Acquisition Module Design of Fault Monitoring System of Wind Turbine
Authors: Dou Yong Gui , Chen Ai Guo , Wang Shi Yong , Yin Xun Zeng , Wang Qian
Published: February 2014

In view of the present, the data acquisition system of the fault monitoring system is not perfect, so the data acquisition module of mechanical fault system of wind power generator is developed based on DSP, which better improves the on-line monitoring system. Firstly, the paper introduces the working principle of the module and the selection principle of set measuring point and monitoring point. Then, it introduces the design of hardware system in detail.
Analysis of the Influence of Environment Parameters on Grid-Connected Photovoltaic System
Authors: Wang Ling Ling , Hu Shu Ju , Meng Yan Feng , Ma Rui
Published: February 2014

The performance of grid-connected Photovoltaic (PV) power generation system operating in the field is inevitably affected by environmental parameters (solar irradiance, temperature, humidity, wind speed, spectrum, cloud cover, dust, etc.), of which the main factors are solar irradiance and temperature. Based on the data of 100kW PV system of ShangYi PV Plant captured form June 1, 2012 to May 31, 2013 (1 min resolution) and the data of Qinghai Delingha 20MW PV Plant in China captured in 2012., the influence of solar irradiance and temperature on PV system is analyzed. The results show hourly PV array DC power has highly significant positive correlation with hourly total solar radiation, also PV system AC power output and solar irradiance have good consistency. Both of them show irradiance is the main environment factor to the PV system. Then using the captured data, the relationship between maximum load and PV panels surface temperature is also analyzed, the surface temperature is higher, the maximum load is lower.
Short Term Wind Speed Prediction Based on Linear Combination and Error Correction
Authors: Zou Jiang Ping , Zhang Bi De , Tian Yuan
Published: February 2014

In order to improve the accuracy of wind speed prediction, a model based on linear combination and error correction is proposed. Firstly, sustainability model, grey verhulst model and weibull model are modified to obtain three predictions; secondly, the three predictions are matrix empowering analyzed based on the proximity to the ideal value to gain weights and linearly combined based on weights to gain the combination result; finally, the error between the actual value and the combination value is predicted by ARMA model, to correct the prediction wind speed to improve accuracy. The wind speed prediction results in the future for a wind farm in china are evaluated by RMSE (Root Mean Square Error) and MAPE (Mean Absolute Percentage Error), demonstrating that the proposed model is reasonable and effective.
Research on Equivalent Modeling of Double-Fed Wind Farm Study
Authors: Zhong Chao , Li Ran
Published: February 2014

This paper used double-fed wind farm as the object. The output power of the double-fed wind farm fluctuates because the wind speed differs and changes and the three-phase shorted to ground fault occurs in the transmission line. The weighted average method was used in double-fed wind farm grid equivalent modeling. By comparing power fluctuations in the actual model and the equivalent model, it is verified the proposed equivalent modeling method is effective.
The Research for the Voltage of Distribution Network Including Distributed Generation
Authors: Shen Xue , Li Ran
Published: February 2014

There is a challenge to the voltage stability of distribution network when DG is added to the distribution network. By means of theoretical derivation, three conclusions had been got. The amplitudes of node voltage would rise including DG. The more capacity of DG, the higher node voltages. The same capacity of DG met different nodes would have different effects on the node voltages. The farther away from the equilibrium node, the higher voltages. Through a case, the correctness of theoretical analysis had been proved.
Power Reserve Classification and Control for Peaking Balance with Intermittent Generation Grid
Authors: Xu Jian Yuan , Li Jia Jue , Zhang Jie Jun , Zhu Yu
Published: February 2014

The problem of intermittent generation peaking is highly concerned by the grid operator. To build control model for solving unbalance of peaking is great necessary. In this paper, we propose reserve classification control model which contain constant reserve control model with real-time reserve control model to guide the peaking balance of the grid with intermittent generation. The proposed model associate time-period constant reserve control model with real-time reserve control model to calculate, and use the peaking margin as intermediate variable. Therefore, the model solutions which are the capacity of reserve classification are obtained. The grid operators use the solution to achieve the peaking balance control. The proposed model was examined by real grid operation case, and the results of the case demonstrate the validity of the proposed model.
Development and Test of the Real-Time Measuring and Control System for a 10 kA HTS Cable
Authors: Zhu Zhi Qin , Dai Shao Tao , Teng Yu Ping , Xiao Li Ye , Song Nai Hao , Liang Xue Min , Cao Zhi Cheng , Zhang Dong , Gao Zhi Yuan , Ma Tao , Lin Liang Zhen
Published: February 2014

A 360 m/10 kA high-temperature superconducting (HTS) cable has been put into demonstration operation on September 26, 2012, which is used to supply to the electrolytic aluminum workshop 10000 A. A real-time measuring and control system for the 10 kA HTS cable is developed and completed. The critical current test and data analysis are finished before the demonstration operation of the 10 kA HTS cable. The parameters of the HTS cable are monitored in demonstration operation. The inlet and outlet temperatures of the HTS cable, which are used to calculate the loss of the HTS cable, are measured accurately.
A Control of Homeostasis for Three-Phase Load in Power System
Authors: Gao Wei Zhao , Zhang Qing Chao , Zheng Ming Zhong , Zhang Heng Chao
Published: February 2014

With the increasing asymmetry of the three-phase load, the problem of three-phase imbalance in power system is becoming more serious every day. Asymmetrical three-phase voltages and currents affect the safe and stable operation of the power system.The main direction for solving the problem of unbalanced three-phase power system is reactive power compensation. But in present paper, we demonstrate a new method. First, we load the single-phase load into the phase with smallest current and keep oscillation. Then, considering that system stability requires as small as possible imbalance, so we treat line current as criterion and adjust part load into system phases to reduce the neutral current to a value less action. Thus we can achieve homeostasis of three-phase load. We also have realized it by simulation.
Potential and Electric Field Distribution of 220kV Insulator String with a Faulty Insulator under Windage Yaw Condition
Authors: Li Hui Hui , Zheng Zheng , Chen Hong Bo , Bai Huan , Zhang Hua Zhao , Ruan Jiang Jun , Wu Jun
Published: February 2014

Faulty insulators could appear in the HV transmission line insulator string under the comprehensive effect of electrical, mechanical and environmental factors and they can be detected according to the space potential and electric field distribution variation characteristics around the insulator string. Finite Element Method (FEM) was used to study the potential and electric field distributions of a 220kV suspension insulator string contained a zero-value insulator in windage condition, comparing with a fine insulator string. The results show that the variation of the space potential and electric field distributions of insulator string is the same as that under no windage condition. The curve of synthetic electric field along the central axis around the good insulator string is U-shape. The 10th and 11th insulators from the high-voltage end are the sensitive insulators where the distortion ratio of synthetic field strength is higher than 3%, when a faulty insulator is in the string. This result can provide preferences for the online detection of faulty insulators.
Research on High Voltage Circuit Breaker Mechanical Faults Online Monitoring
Authors: Quan Yu Sheng , Wang Zi Jian , Wu Yan , Fang Lin Jie
Published: February 2014

In power transformation and distribution system, unplanned blackouts caused by high voltage circuit breaker faults accounted for more than 60% of the total accidents [, most of the circuit breaker faults are caused by mechanical faults. Base on circuit breaker electrical characteristics, this paper present a method of circuit breaker mechanical faults on-line monitoring. Switching on-off of circuit breakers contacts can be equivalent to a time-varying capacitance, based on equivalent circuit model, the relationship between reactive component and time can be concluded. Processing circuit breakers contacts electric signals with orthogonal decomposition and least squares curve fitting method to highlight the main characteristics of the mechanical faults. These processed data collected from different running state can create a database, taking this database as diagnostic basis to diagnose whether mechanical faults occur to circuit breaker.
The Study on Numerical Calculation of Unequal Potential Grounding Parameters of Large Hydropower Plant
Authors: Dai Li Ping , Yan Qiang Qiang , Gao Pu
Published: February 2014

To solve the problem of grounding parameters of large hydropower, which is in a special soil environment, we deduced unequal potential calculation formula ,based on the model of unequal potential in ground grid and combined with the boundary element method and node voltage method. Through example calculations, the paper analyzes the impact of the ground grid size, soil resistivity and conductor permeability on unequal potential and proves the accuracy of the results, compared with CDEGS software. This method can be used in grounding calculation and analysis of large hydropower stations.
Typical Insulation Defects Simulation and Signal Characteristics Analysis of GIS Partial Discharge
Authors: Wang Kang Ning , Wang Tian Zheng , Yan Jie
Published: February 2014

Gas insulated switchgear (GIS) has excellent performances such as small area, not affected by atmosphere, high reliability. So it has been used more and more widely in the power system. However, But the partial discharge (PD) would occur because of insulation defect, PD will lead to the GIS insulation damage after a long time, and will lead to serious consequences without treatment in time, therefore, the PD detection is particularly important. Article simulates the high voltage conductor spikes, basin insulator metal particles on the surface and the shell spike the insulation of the three kinds of typical defects, using the pulse current method and ultrasonic method to test partial discharge signals and get the corresponding signal characteristics, which play a certain guiding significance for field applications.
Flexible Power Flow Algorithm for Distribution Network Including Second-Order Items
Authors: Zhou Ning , Chen Ru Si , Lin Tao , Li Qiang , He Xiang , Ye Jing
Published: February 2014

For intelligent distribution system including Distributed Generations, we take the generator and load static characteristic into account and propose a flexible power flow algorithm for distribution network including second-order items. First, this algorithm modifies the distribution network power flow equations including second-order items in order to meet the static characteristic of generator and load. Moreover, we use the fsolve function of MATLAB to solve the power flow equations. This algorithm makes full use of the characteristic of high accuracy of the distribution network flow equations including second-order items and good convergence of the fsolve function. Compared with conventional distribution power flow algorithm, it does not need to set the trend flexible node type of each one. Not only the voltage amplitude, phase information of each node and the system frequency information can be calculated, as well as the actual power of generator and loads. The result of the algorithm is more in line with the practical electric power system engineering. Improved IEEE33 node system is chosen to verify the correctness of the algorithm.
The Plant-Level Optimal Load Distribution Based on Economy and Environmental Protection
Authors: Qin Li Jun , Li Jia Di
Published: February 2014

In order to meet new mode of operation in current Chinese electricity market, the paper puts forward the multi-objective optimization for plant-level load distribution based on economy and environment protection. It can balance the benefits between power plants and grids. While it can minimize coal consumption, reduce the emission of pollutants and make important effects on economy and environment. This paper proposes to calculate the sum cost of coal and sewage as the new model of objective function. Through the different weights on economy and environment, plants change the assigned load so as to make the objective function minimum and achieve the optimal load distribution. At the last we can get a optimal curve by simulation.
Analysis on Thermal Economy and Peak-Shaving Capability for Combined Heat and Power (CHP) Unit in Varying Operating Conditions
Authors: Tian Chun Guang , Lv Xiang Yu , Li De Xin , Dong Tian , Han Xiao Juan
Published: February 2014

Based on the principle of featured through-current area being constant, calculation model for parameters of regenerative steam extraction of CHP unit in different heating conditions is developed in this paper through using FROTRAN software. The generated output and thermal economy of the CHP unit are calculated by using the method of equivalent enthalpy drop, and the accuracy of the model is verified. With the purpose to analyze the rationality of different calculation methods, the distribution ratio of coal consumption for heat supply and coal consumption rate for power generation are calculated through method of equivalent enthalpy drop, heat quantity method and method of actual enthalpy drop under the same operating condition. Moreover, according to the operation test on the unit, the highest and lowest generated output of the CHP under various loads of heat supply are determined, which will provide a basis to the subsequent thermoelectric units in participating in peak shaving of power grid.
Research on Composite System of Solar Energy Reclaimed Water Heat Pump and Phase Change Energy Storage
Authors: Li Hui Xing , Cheng Peng , Feng Guo Hui , Zhang Ran
Published: February 2014

New energy development and utilization is an important approach to solve the problem of energy shortage,a new type of composite heating system is proposed in this study. It expounds the research ideas, the technical principle and operation plan of the system. Through a comparative analysis of the performance coefficient of composite heating system, reclaimed water source heat pump system and solar hot water heating system, it Comes to the conclusions that the composite heating system can not only reduce the operating cost but also improve the running performance of reclaimed water source heat pump and reduce the heat loss of solar hot water heating system.
The Influence of NaOH Concentration on the Performance of ZnO by a Hydrothermal Process
Authors: Xiao Zong Hu , Xu Shun Jian , Luo Yong Ping , Huang Yong , Zhong Wei , Ou Hui
Published: February 2014

Zinc oxide (ZnO) with various morphologies have been successfully prepared by a hydrothermal process from zinc acetate (Zn (CH3COO)2) and sodium hydroxide (NaOH) solution. The influence of NaOH concentration on the morphology of ZnO was investigated. And ZnO with various morphologies were applied in dye-sensitized solar cells (DSCs) as the photoelectrodes. Results show that thec-axis preferred growth of ZnO is becoming increasingly obvious with the increase of NaOH concentration. There are a lof of differences in the photovoltaic performances of DSCs, which are based on ZnO with various morphologies as the photoelectrodes. DSC consisted of ZnO nanoparticles has optimal performances, the corresponding short circuit photocurrent density (Jsc), open circuit voltage (Voc), fill factor (FF) and photoelectric conversion efficiency (η) are 3.97 mA/cm2, 0.653 V,0.59 and 1.52 %, respectively.
Fabrication of Three-Dimensional Porous Sn Films as Anode for Li-Ion Batteries
Authors: Xing Ya Lan , Ye Chan , An Yi Ran , Zhang Shi Chao
Published: February 2014

A polystyrene spheres (PS) coated copper foil was adopted as a template to prepare three-dimensional (3D) porous Sn film electrode. The PS colloidal spheres were synthesized through emulsion polymerization and spin-coated on copper foil. Then Tin was electrodeposited on the template foil, following by etching in tetrahydrofuran to remove PS template. The obtained Sn film has a honeycomb-like porous structure and showed improved electrochemical performance.
Design and Analytical and Numerical Calculation of Pressure Vessel for Hydrogen Gas
Authors: Badida Miroslav , Hurajt Marián , Jezný Tomáš , Rusnák Radoslav
Published: February 2014

The article deals with of a hydrogen pressure vessel suitable for high pressure of approximately 75MPa. One of the goals is to design a vessel from materials whose strength will meet mechanical requirements a calculated in both analytical and numerical ways. Another objective is the simulation of the design the pressure vessel with regard to safety and weight requirements.
Effects of Working Temperature and Working Pressure on Separation Coefficient and Pressure Drop of Hollow Fiber Membrane Module in an Aircraft Fuel Inerting System
Authors: Cai Yan , Lin Gui Ping , Zeng Yu , Peng Long , Li Zi Xuan
Published: February 2014

Air separation experiments were conducted in a hollow fiber membrane module under various working conditions. Effects of working temperature and working pressure on separation coefficient and pressure drop were investigated when the mass fraction of oxygen in the nitrogen-rich gas was 2%, 5% and 12%, respectively. It is revealed that high temperature working and storage (100°C) of the hollow fiber membrane module could help to obtain higher separation coefficients for the 2% and 5% oxygen concentrations and when the oxygen concentration of the nitrogen-rich gas was 12%, the result was opposite. For the pressure drop, the low temperature working and storage (-55°C) working conditions led to lower values. Furthermore, low working pressure (an 11 km height pressure) is helpful to gain higher separation coefficient and not favorable to obtain lower pressure drop.
Phase Equilibria of Carbon Dioxide, Propane Hydrate in the Presence of Glucose and Fructose
Authors: Tan Zhe , Li Shi Feng , Shen Yan Ming , Liu Dong Bin , Fan Li Hui
Published: February 2014

Phase equilibrium data for the hydrates formed in four three-component systems: CO2 + glucose + water system, CO2 + fructose + water system, C3H8 + glucose + water system, C3H8 + fructose + water system were measured in pressures range of (0.24 to 4.57 MPa) and temperatures range of (274.9 to 283.1 K) at 5% and 10% mass fraction of additives. The experimental data were determined using an isochoric pressure-search method. The effects of glucose (or fructose) on CO2 and C3H8 hydrate formation condition were studied. The addition of glucose or fructose increase the equilibrium pressure of the CO2 and C3H8 to form hydrate, and the presence of 10 mass% concentration of glucose (or fructose) showed more remarkable inhibition effect on CO2 and C3H8 hydrate formation.