bluuebunny/crossref_metadata_2025 huggingface dataset:
An Investigation into the Conversion of Propylene Glycol to 2,4-dimethyl-1,3-dioxolane over an Acid Catalyst Using Gas Chromatography
Authors: Zhang Zuo You , Chen Hui , Li Xia , Yang Zhao Hui , Liang Bao Chen
Published: December 2013

In the presence of an acid catalyst, PG react reversibly with acetaldehyde to form 2,4-dim-ethyl-1,3-dioxolane (24DMD). The effects of different operational parameters on PG conversion had been analyzed in paper, parameters included temperature, reaction time, amount of catalyst and aqueous acetaldehyde/PG molar ratio. Under optimal condition, 85% conversion of PG in aqueous solution was achieved within 180 min of reaction. The analysis of PG was conducted by gas chromatograph. Furthermore, reaction followed the second-order reaction kinetics, and the reaction rate constant was found to be 29.68min-1.
An Dehazing Algorithm of Lossy Compression Video Image
Authors: Jin Guo Dong , Lu Li Bin , Zhu Xiao Fei
Published: December 2013

Using dark channel prior to estimate the thickness of the haze , recent research work has made significant progresses in single image dehazing. However , it is difficult to apply existing method for processing high resolution input images because of t he heavy computation cost s of it . For some kinds of input images , existing method still can not reach enough accuracy . we develop a powerful and practical single image dehazing method. The experimental results show our gradient prior of transmission map s greatly reduces t he computation cost s of t he previous method. Furthermore , the optimization methods and parameter adjustment for our novel image prior enhance t he accuracy of the computation related with transmission map. Overall , compared wit h the state of the art , our new single image dehazing method achieves t he same, and even better image quality with only around 1/8 computation time and memory cost .
A Novel Multiphase Level Set Method to Image Segmentation Combined with Edge-Link Method
Authors: Wu Hong Jiang , Zhao Hai Yan , Meng Jin , Zhao Jing
Published: December 2013

An improved level set PDE based on the Chan-Vese multiphase level set method is proposed. Because the segmentation results is well influenced by the initial zero level set, we use the method based on Edge-Link to obtain initial zero level set of the proposed multiphase level set segmentation model. Experimental results of ambiguous edges in human motion image suggest the efficiency and accuracy of the algorithm in its segmentation operations.
Research on Simulation Test of Coal Similar Material
Authors: Dai Lin Chao
Published: December 2013

In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.
Comparative Research on Basic Composition and Processing Properties of Inulin and Inulin Granules
Authors: Yu Ji Yang , Li Xin Hua , Lu Fei , Wang Di , Qin Ning , Wang Lin
Published: December 2013

In order to investigate the feasibility of alternative of Inulin and Inulin Granules in processing applied, the influence of the processing properties of inulin and Inulin Granules has carried on the comparative analysis in experiment .The results show that, in gel application of raw material, the gel formed at the concentration of 40%, and took 6 hours for gelation. All of Inulin Granules and inulin in gel processing properties differences were not significant, can replace each other. Applications in raw Water Holding Capability, which can replace each other in a certain extent; The pervious to light transmittance, freeze-thaw stability and acid stability was no significant difference; The viscosity of both all can reach more than 140 MPa·S, conform to the viscosity of colloid product specifications.
Near-Field Beamforming Based on the Constrained Optimization
Authors: Mu Fei Yan , Lin Jie , Zhang Jia Fen , He Jing
Published: December 2013

This paper studies the near-field beamforming. Based on near-field model, a constraint optimum beamforming algorithm is proposed. The algorithm transforms solving weight value into optimal solution searching, and obtains the optimal weight value by iterative solution. The algorithm can produce optimal beamforming under restricted mainlobe condition. Analogously, it can produce the optimal beam forming under sidelobe constraint. The algorithm can be modified appropriately depending on the desired targets to achieve the desired response control constraints. The algorithm is simple. The simulation results based on discrete uniform linear array show the validity and effectiveness of the method.
Adaptive Synchronization of the Fractional-Order Sprott N System
Authors: Dang Hong Gang
Published: December 2013

In this paper, adaptive synchronization of the fractional-order Sprott N system is investigated. Firstly, the chaotic attractors on different phase plane of the system are got by means of numerical simulation. Then based on the stability theory of fractional-order systems, the adaptive synchronization of the system is realized. Numerical simulations are used to demonstrate the effectiveness for the controllers.
Hopf Bifurcation and Stability Analysis for a Predator-Prey Model with Delays
Authors: Chen Hong Bing , Wang Li Mei
Published: December 2013

In this paper, a predatorprey model with discrete and distributed delays is investigated. The necessary and sufficient of the stable equilibrium point for this model is studied. Further, analyzed the associated characteristic equation. And, it is found that Hopf bifurcation occurs when τ crosses some critical value. Last, an example showed the feasibility of results.
Topology Identification and Adaptive Synchronization of Fractional-Order Complex Networks
Authors: Jia Jin Ping
Published: December 2013

This paper investigates topology identification and adaptive synchronization of uncertain complex networks with fractional-order systems nodes. In comparison with those of the integerorder chaotic system nodes, this method is more efficiently which can enlarge the key space. Moreover, the uncertain network topological structure is identified simultaneously in the process of synchronization. Illustrative examples are presented to demonstrate the application of the theoretical results.
Simulation of Forward-Scattering in the Underwater Range-Gated Imaging System
Authors: Dai Lu , Zhang Xiao Hui
Published: December 2013

Forward-scattering exists in the process of underwater range-gated imaging. Taking the forward-scattering in the process of illumination and reflection into account, it is obtained the conclusion that when the imaging distance increases, the forward-scattering power decreases; when the attenuation coefficient increases, the forward-scattering power decreases.
Research on Optimization of Preventive Maintenance Interval Decision for Vessel Equipment
Authors: Yang Bo , Chen Ya
Published: December 2013

Optimization of preventive maintenance interval decision for vessel equipment is a multi-attribute decision making problem. But the current studies on the preventive maintenance strategies are mostly with single-objective and based on the assumptions that equipments operating for unlimited time. In this paper, a multi-objective optimization model in limited time is established basing on the existing studies. And the case study of a certain type diesel engine fuel system is used to illustrate the methodology.
The Study on the Evaluation Model of DEA Cross-Efficiency and Fuzzy Comprehensive Assessment in Decision Making for Bidding of Construction Projects
Authors: Li Chuan Jun
Published: December 2013

This paper tries to use Data Envelopment Analysis (DEA) as the foundation, combining Fuzzy Comprehensive Assessment (FCA) method and Analytic Hierarchy Process (AHP), to make decisions for the project. First we use FCA method to analyze and quantize each index, then use AHP method to determine the weight of each index, use Evaluation Model of DEA Cross-efficiency to reduce the error of expert evaluation and weight in the FCA method. This paper will give the detailed steps. Finally, we use a case to test the reliability and feasibility of our method. We think, this paper will provide a now method for the Construction project bidders.
Mobile Customer Satisfaction Research Based on Structural Equation Model - Sampling of Student from Beijing University of Posts and Telecommunications
Authors: Pang Jiao Zi , Yuan Ye
Published: December 2013

This article studies the practical significance of Chinese Mobile operators improve customer satisfaction, conducts researches based on students of Beijing University of Posts and Telecommunications, identifies the impact of mobile customer satisfaction index and uses structural equation modeling to identify the key dimensions that have impact on improving satisfaction. The results show that sales promotions, such as freebies, coupons and raffle have a positive correlation with mobile customer satisfaction, and customers prefer freebies among all kinds of sales promotions. This study also finds that customers personal values are positively correlated to sales promotions; however, there is no significant positive correlation between customers personal value and mobile customer satisfaction.
Dynamic Prediction of Individual Customer’s Purchase Behavior
Authors: Guo Lei , Hu An An , Qin Er Wa
Published: December 2013

Each customer has specific purchase regularity. To predict the customers purchase behavior, some researchers have built a static model which not considere the environmental change and the customers characteristics. To dynamically predict customer purchase behavior, this paper introduces a posteriori estimation method. Based on the customers purchased information, the method combine with the customers current events, then applies the Bayes theorem to posteriori estimate the customers purchase behavior. The new method not only predict individual customers purchase behavior, but also improve the prediction accuracy. It will be helpful for the enterprises to optimize arrangements for the production and inventory and reduce operating costs.
The Calculation of Physicochemical Parameters in the Mimetite Dissolving Process
Authors: Cao Shuang , Zhang Zong Lan , Dai Liu Qin , Zhu Yi Nian , Zhu Zong Qiang , Tan Liang Liang , Wei Cai Chun
Published: December 2013

Solubility of the artificial synthesis Pb(AsO_4 )_3 Cl was studied at different pH and same temperature to get its solubility product Pb(AsO_4 )_3 Cl and formation free energy (∆G_f^0). The results showed that the solubility and stability of Pb(AsO_4 )_3 Cl were related to pH in the same temperature. The solubility of Pb(AsO_4 )_3 Cl was high in acidic environment (initial pH=2) and in initial pH=4,6 conditions its solubility as near as makes no difference. The ∆G_f^0 increased with increasing temperature.
The Sensitivity Analysis of CO2 Recovery & Liquefaction Flowsheet in the Beer Fermentation Process by Aspen Plus Software
Authors: Yu Ke Zhi , Yu Yuan , Zhao Hai Peng
Published: December 2013

Aspen Plus software is adopted to simulate the CO2 recovery & liquefaction flowsheet in the beer fermentation process. According to the simulation results, the parameters of scrubber, CO2 compressor and CO2 condenser are analyzed. The sensitivity analysis is also made for the scrubber water consumption, CO2 compressor pressure and flash temperature of CO2 condenser.
Modeling and Simulation of LiFePO4 Battery for Electric Vehicle
Authors: Du Chang Qing , Li Fan , Hou Xian Jun , Zhao Yi Fan
Published: December 2013

For accurately studying the performance of LiFePO4 battery group, this paper conducted CC and HPPC cycle charge/discharge performance tests of LiFePO4 battery, and designed an improved equivalent circuit model based on the data analysis. Compared to the traditional model, the model considered the impact of the hysteresis voltage, had more accurate corresponding relationship between SOC and balance voltage, obtained a more realistic overpotential property by contrasting different order models. Estimated model parameters, modeling in Matlab / Simulink environment and simulation in the UDDS condition, verified the accuracy and feasibility of the designed model by comparing with experimental data.
Feasibility Analysis of Hybrid Power System Used on Solar-Powered Aircraft
Authors: Sun Kang Wen , Ni Min
Published: December 2013

Using only photovoltaic battery on solar-powered aircraft will waste energy because of its low conversion efficiency. For reusing the energy that converted into heat by photovoltaic cells, a hybrid power system is presented in this paper for solar-powered aircraft. Its a new electricity-generating method that spreading photovoltaic cells on the wing surface and arranging photothermal cells in the wing box section. Due to temperature of the back of photovoltaic battery is high, it can be used as high temperature heat source. And the lower wing surface can be a low temperature cooling source. A lightweight solar-powered UAV was used to analyze the relevant performances of pure photovoltaic powered aircraft and hybrid powered aircraft. The result shows that using hybrid system can reduce the area of wing by 4.6%, and solar-powered aircraft with a 6m or below-6m wingspan can raise the utilization rate of solar energy per unit area by adopting hybrid power system.
The Interpretation of Norman Foster's Architectural Design Conception
Authors: Yang Li , Song De Xuan , Zhen Ke Jia
Published: December 2013

Norman Foster is one of the most famous and successful architects all around the world today. So in this context, we interpret Norman Foster's architectural design conception, especially high-tech, ecological architectural environment and regional culture. The architectures designed by him have an intense sense of the times and are much environment-friendly. Meanwhile, Norman Foster commendably combined the buildings with place spirit and traditional cultures so that he could make them harmonious organically fuse and become a feature of cities' scenery line. In a word, analysis of Norman Foster's architectural design can provide inspiring and creative thinking ideas for architects.
Cooling Effect of Waste Fiber Culture Medium Used as Extensive Green Roof
Authors: Hsieh Jing Chzi , Li Jia Hsun , Lin Jia Horng
Published: December 2013

Greening on roofs that are not totally used can create a good cooling effect and mitigate the urban heat island effect. Considering the load capacity of roofs and ecological protection, this study thus uses fiber waste to make culture mediums as an extensive green roof, after which sedum makinoi is then planted to evaluate the cooling effect of the waste fiber culture medium. The experimental results show that sedum makinoi planted with waste fiber culture medium can averagely reduce the temperature of the roof surface by 5 °C and to a maximum of 11.8 °C. Although experimental group and control group both have the same cooling effect, waste fiber culture medium which is much lighter than that of the control group, and it also has a life-cycle, an energy-saving, ecological friendly merit, both of which qualify it for use of the culture medium as extensive green roof.
Experimental Study in Gangue Base-Course Mixture Materials for Pavement
Authors: Wang Fu Jun , Luo Jing , Zhu Hui Rong
Published: December 2013

Coal gangue, acting as the solid skeleton of pavement base materials, can efficiently reduce the drying shrinkage. Additionally, similar to fly ash in mixture material, gangue can react with lime (so called pozzolanic reaction), resulting in the formation of pavement base with a certain strength, good water stability and frost resistance, are good overall at the grass-roots level. Many cities in our country has gradually tried to use different kinds of industrial waste residue instead of sand to prepare the pavement base materials. This way, not only the waste residue is recycled, the lack of sand aggregates in road construction can also be overcome, which facilitate technical and economic growths.
GIS-Based Quantitative Analysis for Mesostructure of Cohesive Soil Containing Calcareous Nodules
Authors: Ji Bin , Wu Dao Xiang
Published: December 2013

A spatial statistic method for quantitative analysis of cohesive soil containing calcareous nodules mesostructure was illustrated in ArcGIS. Through cluster unsupervised classification methods of raster image processing, calcareous nodules can be extracted from soil mesostructure images. Using standard deviational ellipse, the orientation angles of calcareous nodules can be fast determined, and the area, perimeter, thickness and characteristics of ellipse of calcareous nodules can be measured by geometry statistics. Based on the above statistical data, the granularity, eccentricity and orientation distribution can be obtained by fractal analysis. The results show that the method is more scientific, reliable and efficient for the quantitative analysis of cohesive soil containing calcareous nodules mesostructure.
Variable Density Cellular Concrete
Authors: Bruyako Mihail G. , Grigoryeva Larisa Stsnislavovna , Kravtsova Darya Victorovna
Published: December 2013

There is mentioned some methods of creation variable density cellular concrete, offered original technique. There are presented some properties of the developed material in comparison with the analogue. Variable density cellular concrete can be described as the material with equal variation of density from its periphery to the center. Potentially it will help to improve strength properties and at the same time to maintain low thermal conductivity value of the variable density units.
The Fuzzy Cluster Analysis Research Methods for Surface Enhanced Materials Resistance to Wind Erosion
Authors: Zhang Yan , Wang Qi Cai , Huo Lin , Sun Xiao Jing
Published: December 2013

Resistance to wind erosion enhancement of existing concrete is a new technology to reinforced concrete surface wind erosion, different from the previous wear-resistant research ideas adjustment made of concrete mix, and thick surface wear additional layers, aims to enhance the resistance of concrete surface wind erosion capacity. With fuzzy clustering analysis method, the author analyzes four different types of existing concrete interface reinforcement materials and Come to different effect. Cluster analysis showed that the composite emulsion concrete surface treatment materials can penetrate through the surface penetration means and react with concrete to form a dense network structure, can achieve the purpose of anti-erosion, the best overall performance.
Use of Thermal Insulating Perlite Composite Materials Based on Geocement to Protect Technological Equipment
Authors: Petranek Vít , Guzii Sergii , Kryvenko Pavlo V. , Sotiriadis Konstantinos , Maňák Jan
Published: December 2013

Two different thermal insulating materials based on geocement (formulated as Na2OAl2O36SiO220H2O) were produced as possible environmentally friendly materials, to substitute existing thermal insulation of technological equipment. Expanded perlite was added as filler during the mixing process. The two thermal insulating perlite composite materials were produced in the form of two-component mixture with a ratio of liquid phase (geocement dispersion) to solid phase (perlite) of 3:1.8 and 3:1.0. The developed materials are characterized by: compressive strength of 0.11-0.14 MPa; average density of 296-320 kg/m3; thermal conductivity coefficient of 0.068-0.078 W/mK; adhesion on metal surface of 1.15-1.32 MPa. The measured temperatures on the thermal insulation coatings of technological equipment confirm the effectiveness of the materials developed. These materials, having a thickness not exceeding 3.5 cm, are recommended for application to technological equipment of complex geometric shape at an operating temperature until 1073 K.
Forecast Research of Combustion Stability of Pulverized Coal
Authors: Yang Xing Sen , Cui Fu Xing
Published: December 2013

The combustion stability of pulverized coal is very essential for utility boilers. That is the key issue to keep the operation of the whole power-generation unit in a safe state. The amount of volatile matter is used to anticipate the combustion state of pulverized coal. As a widely accepted concept, higher volatile matter content would result in more stable combustion state. But in some cases, the coal with high volatile matter content led to poor combustion states, even resulted in the flameout of the burner. More method is needed to judge the coal and to predict the combustion stability. With research on the approximate analysis of the coal composition, the heat value of volatile matter was calculated. Such heat value varies obviously for different kinds of coal. The ratio of the heat value of volatile matter to the heat value of fixed carbon is supposed to describe the combustion stability of pulverized coal. The application of the method judges the coal better than using the amount of volatile matter alone.
Experimental Study on Rich Oxygen Gasification and Ash Character in Entrainedflow Coal Gasifier
Authors: Dai Bai Qian , Wu Xiao Jiang , Lou Tong , Zhang Zhong Xiao
Published: December 2013

Entrainedflow Gasifier with Large Capacity and Slagging Tap is Usually Use for IGCC and Largescale Chemical Industrial Factory. while, there are 57% of Reserved Coal is Highfusion Temperature Coal, which Cannot Satisfy the Requirement of Thegasification for Slagging Tap. . Therefore, Two Typical Kinds of Chinese Coals Wereselected and Gasified in a Lab-Scale down-Flow Gasifier with Feeding Rate Ataround 1kg/h. the Results Show that along with the Increasing Temperature, Thecarbon Conversion and Cold Gas Efficiency will be Increased Quickly Whentemperature is below 1400°C, and then Increased Slowly when above 1400°C. the Optimum O/C Molarratio is around 1:1, the Cold Gas Efficiency and Carbon Conversion under Thisexperimental Condition (1300-1400°C) are Separately 31% and 80%. at the Optimumgasification Condition, Increasing the Residence Time will also Increase Thecoal Gas Concentration, Carbon Conversion and Cold Gas Efficiency. under Thisexperimental Condition, the Best Residence Time is at Least 1.5~2.0s.
Numerical Simulation of Air Flow in BiPV-Trombe Wall
Authors: Xu Xiao Wei , Su Ya Xin
Published: December 2013

A novel built-in photovoltaic Trombe wall (BiPV-TW) was proposed in this paper and the air flow in a BiPV-Trombe wall was numerically simulated by CFD method. The effect of channel height on flow patterns and air velocity was analyzed. The mass flow rate of air was calculated and a dimensionless expression to calculate the air flow rate in term of a Reynolds number was correlated according to a modified Rayleigh number and the aspect ratio, H/b, which took into account both of the channel sizes and solar radiation based on a multivariable regression analysis.
Numerical Simulation and Optimization of the Flow Field in the SCR System
Authors: Hong Wen Peng , Ding Hao Shu , Huang Yue
Published: December 2013

Software FLUENT is used to carry out the numerical simulation of SCR reactor for studying the influence of the guide plates.The results show that the flowing conditions of the flue gas in the SCR system have a significant influence upon the actual effect of the denitration reaction based on a 330MW coal-fired power plant.In order to improve the performance of the device, choosing the solution that can satisfy the requirement of design which σ (uneven speed value of the first section upon the catalyst) is less than 15%. In the optimal decision,σ is 14.4% and the system pressure drop is 134.43Pa. The appropriate arrangement of the guide plates has a positive impact on the denitration reaction and the workinglife of the catalyst.
Modular Design of Control System for Photovoltaic Inverter
Authors: Geng Wei Dong , Fan Hao Yang , Sun Zu Jun , Liu Yan Yan , Zhou Kai , Yang Hao Ran , Li Xiao Peng
Published: December 2013

This paper analyzes the modular design method of the photovoltaic power generation system and presents a 5KW solar power inverter with variety of operating modes. Depending on the signal interface model, the hardware circuit is divided into several modules, including DC-DC main power circuit, DC-DC control circuit, DC-AC main power circuit, DC-AC control circuit and auxiliary power supply module. The circuit detail design is given and this system has been already used in the solar power stations. The circuit has a reusable and beneficial photovoltaic inverter standardized design. The experiment results prove that this system has features of reliability, easy maintenance, strong scalability and meets the requirements of the solar-energy generation system.
Research on Francis Turbine Hydraulic Vibration by CFD
Authors: Yang Jing , Zhang Li Da , Lu Lei
Published: December 2013

The normal operation of the hydropower station is seriously affected by the vibration problems. This paper is about how to analysis and improve the hydraulic vibration problem by an example of a low head Francis turbine in the southwest of China with higher head. The models was built by using UG and analysed by CFD numerical analysis software to simulate the vibration conditions with air-water two-phase flow. With the reason was found by the the result of numerical calcuate, air compensation method was put out to improve the vibration condition and the optimal volume of the compensative air was calcuated to verify the solution method.
Cause Research about Vibration and Noise Caused by Channel Vortices at High Load in Francis Turbine
Authors: Lu Lei , Zhang Li Da , Yang Jing , Zhou Long , Xu Zhi Jian
Published: December 2013

A low head hydropower station is in the southwest of China, its Francis turbine ran well at a rated power and rated net head, but the turbine produced severe abnormal vibration and noise at higher head than the rated head, full load and overload. By analyzing, characteristic points on vibration conditions are inside the area of channel vortices on runner performance curve. CFD analysis indicates that unstable vortices exist between runner blades. The two results demonstrate that the vibration and noise of Francis turbine are caused by runner channel vortices at higher head than the rated head, full load and overload.
Multiple Models Fuzzy PID Controller Design in Air-Condition Temperature Control System
Authors: Jiang Hang , Wang Xin , Zheng Yi Hui , Li Li Xue , Liu Yan
Published: December 2013

This paper deals with the study of air-condition temperature control, which is a complex system of time varying, nonlinear, imprecise model and uncertain work environment. In this paper, a multiple models fuzzy PID controller is designed. Considering the air-condition temperature adjustment system to combat aircraft and the frequently changing external environment the multiple fuzzy PID controllers are estimated according to the temperature changing area. Each time, based on temperature tested, only one fuzzy PID Controller is chosen to improve the control precision. At the end, simulation results show that multiple model fuzzy PID control is superior to the single fuzzy PID control, which effectively improve the transient response of the system, the steady state accuracy and robustness, having good prospects for engineering applications.
PV System Power Forecasting Based on Neural Network with Fuzzy Processing of Weather Factors
Authors: Hu Yong Qiang , Wang Ming Yu
Published: December 2013

A short-term PV system power forecasting method is presented in the paper based on neural network considering fuzzy characteristics of weather factors. Weather factors that affect PV system power output mainly include temperature, radiation intensity, rain and relative humidity which are all of strong fuzziness. The paper firstly made use of membership functions to process their fuzziness. Then, the historical power data of a PV system was put into neural network together with fuzzy processed historical weather data to train the network, therefore, neural network that be able to forecast PV power was get. Finally, data of an actual PV system in Colorado was employed to methods with and without fuzzy processing of weather factors, results show that the method with fuzzy processing is more accurate than that without fuzzy processing.
Analysis of Vehicle Dynamic Performance Based on MATLAB
Authors: Bao Fan Biao
Published: December 2013

This document focus on the car's dynamic performance characteristics.Because MATLAB has many advantages such as intuitive, clear physical meaning, a small amount of programming, data visualization and high degree of merit. This paper Computes and analysis with the introduction of an instance practice vehicle models.In light of the specific model parameters, this paper has analyzed car driver and driving resistance balance, power balance and power factor based on the application of Mat Lab's data analysis and graphics, and drawn the relevant graph, according to the mapping feature maps.The paper analysis of the car comprehensive power the car's dynamic graphing features calculation and research method are provided. The paper has provided new ideas of vehicle parameter selection and design.It has some practical value.
Diamond-Nickel Composite Plated Grinding Needle Used for Finish of Airflow Channel on the Gas Turbine Blade
Authors: Guo Dong Li , Zhang Quan Sheng , Xia Ji
Published: December 2013

Gas turbine blade is the key components of generator which using natural gas as the power source. The airflow channel on the gas turbine blade has an important effect on the blade life and the power generation efficiency. Diamond-nickel composite plated grinding needle was usually used for the airflow channel finish. The process of the diamond-nickel composite plated grinding needle was introduced in this paper. Monolayer of the ~60μm diamond was first embedded in 12μm~15μm nickel layer, then followed with 25μm~30μm thicker nickel layer plated to hold the diamond tightly. The results show that, the coating adhesion was affected by the bath pH and the roughness of the needle original surface. The grinding needle manufactured in optimized process was tested with MICROMOT 50/E drill grinder at the speed of 8000rpm, the results showed that, 5-7 holes were drilled on the glass with thickness of 1.5mm; the drilling speed was 1.5mm/min.
Effect of Steam Turbine Rotor Notch Fillet Radius on Stress and Deformation
Authors: Ji Dong Mei , Shen M. H. Herman , Yang Shi Hua , Xia Gang
Published: December 2013

A thorough investigation on the effect of a 320MW steam turbine rotor notch fillet radius on thermal and mechanical stresses during start up is presented. The approach consists of a shape design and analysis procedure which incorporates a finite element model. The finite element model is used to characterize the radius of the rotor notch fillet for ensuring the designed thermal and mechanical stress state/pattern and associated deflection during start-up. The results indicate that the notch fillet radius r has significant impact on the total stress of the rotor, in particular on thermal stress. It is determined that the thermal stress is decreased as the notch fillet radius r increases to a critical value. However, the thermal stress becomes saturated as the radius is increased to values larger than the critical value. The results also indicate that the rotor notch fillet radius has little effect on the deflection of the rotor during start-up. This investigation could be very useful to designers for construction of the design guidelines for steam turbine rotors.
Experimental Study on Direct Coupling in a Photovoltaic-Electrolyte Hydrogen Generation System
Authors: Liu Ye Feng , Ma Jun Lin , Zhou Ming Jie
Published: December 2013

Hydrogen is the most potential clean energy in the twenty-first century and can be obtained by the electrolysis of water. As a secondary energy, its production would be restricted by large amount of energy consumption and low efficiency. It is advantageous if an electrolyser can be simply and efficiently coupled to a renewable source of electrical energy. In this paper, it investigated the optimal way to maximize the transference of energy from a photovoltaic (PV) array directly coupled to a polymer electrolyte membrane (PEM) electrolyser in a photovoltaic-electrolyte hydrogen generation system (PV hydrogen system). The pivotal strategy is to find the series parallel combination of the PV cells and electrolyser stacks, which produces the highest energy transfer efficiency. The optimal configuration is a PV array consisted of three parallel connected PV cells directly coupled to a PEM electrolyser consisted of twelve series-connected electrolyser stacks with a day energy transfer efficiency of 99.52%. Comparisons between direct coupling systems and traditional ones have been presented. The result shows that direct coupling technology is feasible to improve the energy transfer efficiency in a PV hydrogen system.
Big Data Analytics-Based Energy-Consumption Feature Selection of Large Thermal Power Units
Authors: Wang Ning Ling , Chen De Gang , Yang Yong Ping
Published: December 2013

Large coal-fired power unit is a complex nonlinear system with more uncertainty to address, evaluate and optimize. It is essential and difficult to determine the key features contributing to the energy consumption of power units, especially considering the varying boundary constraints, operation conditions and system characteristics. In this paper idea of big data analytics is employed to clean the historian operation data efficiently and select the key energy-consumption features with less information losses. The result shows that the resultant key features reflect the exterior factors and system behavior. It makes great reference for the modeling and optimization of large thermal power units.
An Advanced Algorithm of Power Flow Calculation for Radial Distribution Networks
Authors: Han Fei , Wang Lei , Feng Guang
Published: December 2013

Through the analysis of traditional forward and backward substitution method, put forward an advanced algorithm of power flow calculation applied for the radial distribution network. This method optimizes the numbered embranchments, nodes, branches, uses directly the branch impedance parameter and the given power of the end node to calculate the voltage and power distribution, And use MATLAB to compile power flow calculation program, which is proved to be feasible by an example.
Fault Location and Isolation Algorithm for Distribution Network with DGs
Authors: Sun Ming , Men Fu Yuan , Luo Yan
Published: December 2013

A novel fault location algorithm for distribution network with DGs (distributed generators) is proposed in this paper. According to the distribution network topology and current information of the switch, fault location can be realized accurately through matrix manipulations and criterion analysis in the algorithm. Based on the fault location, a simple method is proposed for the realization of fast fault isolation. Finally, the correctness and feasibility of the algorithm is validated through the analysis of the typical distribution network with DGs.
Probability Analysis Method of Power System Cascading Failures Caused by Extreme Hot Weather
Authors: Chen Qiang , Guo Yu Feng , Pan Na , Yu Ji Lai
Published: December 2013

In recent years, natural disasters happened frequently, which caused more and more failures of power system. To study the transmission lines failure under extreme hot weather, firstly the line's temperature changing with time is forecast based on the heat balance equation and the line's failure probability is calculated according to the historical statistics of failure rate. Then a test system to simulate the power grid under extreme hot weather is built and the curve of line's failure probability changing with time is obtained. The results provide a reference to power sector to guarantee the security and stability of the power grid.
A Kind of Equipment Fault Indicator Recognition Method
Authors: Wang Gui Ming , Zhan Jie , Niu Lin , Cui Jin Tao , Huang Jin Xin , Zhang Bo
Published: December 2013

To analysis the main factors that lead to device fail and identify the fault indicator , this paper proposes a method about correlation identification between the multi-factor and equipments failure. Firstly, this paper sets the related factors influencing the equipments failure as numerical value, based on distance correlation definition, calculate the correlation between each factors and equipments failure. So that determines the power of the main causes of equipments failure. At last, through 330 kV transformer fault case validates the effectiveness and unbiasedness of the proposed method.
Analysis on Sub-Synchronous Damping Characteristic of VSC-HVDC
Authors: Gao Ben Feng , Liu Jin , Zhao Shu Qiang , Xu Kun
Published: December 2013

The study on the HVDC based on voltage-source converter focuses mainly on the control strategy while less on the impact of electrical damping on the adjacent units by VSC-HVDC. The mechanism of VSC-HVDC on inhibiting sub-synchronous oscillation is analyzed theoretically in the respect of its operation principle. Then the complex torque coefficient method realized by time domain simulation-the test signal method, is adopted to investigate the impact of the unit interaction factor, control mode, active power level and reactive power level on the electrical damping on the adjacent units.
Application of Improved Ant Colony Optimization on Economical Operation of Automatic Generation Control Units in Hydropower Station
Authors: Li Yi Fan , Wang Ke Guan , Gong Chuan Li
Published: December 2013

This paper proposed an improved ant colony optimization(ACO), to solve the economical operating dispatch of automatic generation control(AGC) units in hydropower station. The improved ant colony algorithm PSO-ACO imported particle swarm optimization is put forward. Both of the global convergence performance and the effectiveness of this algorithm is improved by using self-adaptive parameters and importing PSO to optimize the current ant paths. The mathematical description and procedure of the PSO-ACO are given with the maximum plant generating efficiency model as an example. Finally the superiority of the PSO-ACO is demonstrated by the application of AGC units on right bank of Three Gorges hydropower station. The optimal solution is more accurate and the calculation speed is higher than other methods.
The Simulation Research of Partial Discharge Electromagnetic Wave Propagation Characteristics in GIS
Authors: Zhao Shan Jun , Xu Dong Shen , Li Zhao , Li Lu , Wang Yi , Lan Qi , Niu Tian Ye , Chang Li , Li Jun Hao
Published: December 2013

GIS is the most important equipment in power grid. Partial discharge is the main cause leading to insulation breakdown. UHF detection is an effective method for PD detection in GIS. It is significant to obtain the electromagnetic propagation characteristics for the accurate analysis of detection results. The FDTD algorithm is present in this paper to study the electromagnetic signal in GIS. The amplitude and frequency characteristics are studied in this paper.
Technical Feasibility of Distributed Generation Network Connection
Authors: Eroshenko Stanislav , Dmitriev Stepan A. , Khalyasmaa Alexandra I.
Published: December 2013

This paper addresses the problems, connected with distributed generation integration into distribution network systems. Due to the large amount of technical impacts associated with distributed generation operation, the list of criteria, illustrating the feasibility of network connection is investigated. The paper also provides the detailed description and practical implementation results of multi-criteria optimization tool, developed for siting and sizing of small-scaled power generation with subsequent technical feasibility analysis.
Study of PD Ultrasonic Wave's Properties in Solid Medium
Authors: Qi Wei Qiang , Li Yan Ran , Chen Xiao Xin , Duan Da Peng
Published: December 2013

Longitudinal ultrasonic wave signals, transverse ultrasonic wave signals and other ultrasonic body wave signals generated by partial discharge are analyzed emphatically in the acoustic emission method of partial discharge detection in high voltage equipment [1-. Velocity of longitudinal ultrasonic wave is often used to calculate partial discharge defects position in the location study of partial discharge. In practical applications errors are always large. And a recent study finds that a class of plate ultrasonic guided waves will be inspired when ultrasonic body waves are transmitted from the gaseous medium to the metal medium [9-1. As the attenuation coefficient is small and the transmission distance is large when the waves propagate along the metal plate, in the partial discharge detection, ultrasonic signals detected by the ultrasonic sensor attached to the equipment enclosure include ultrasonic guided waves besides the ultrasonic body waves.
The Study of the Partial Discharge Characteristics of Floating Potential Defects in GIS
Authors: Zhang Hai Ning , Kang Jun , Liao Peng , Li Jun Hao , Li Yan Ming
Published: December 2013

Abstract. Once the GIS appears screws loose and other phenomena, it will lead to the generation of floating potential, then trigger the floating potential discharge. In order to study the discharge characteristics of the floating potential, this paper artificially built floating potential defects on the GIS malfunction simulation platform, and detected with ultrasound and UHF methods. The results show that once the floating potential discharged, it would produce a larger amplitude signal. And the discharge most concentrated between the zero crossing and the peak point among the entire phase range. Ultrasound and UHF detection has obvious signal.
Immunity Test of a Microcontroller by Using Transmission Line Pulse Generator
Authors: Liang Zhen Guang , Yang Ming Yuan
Published: December 2013

Electrostatic discharge is a familiar interfere. Repeatability of discharge current is poor. Transmission line pulse (TLP) is used in study of immunity of a microcontroller. A TLP generator is first manufactured with the rise time of output pulse less than 1ns. Then couplings by electric field probe, magnetic field probe and direct injection are presented. And immunity test of a microcontroller is done by using the TLP generator and probes. Results show that the tested microcontroller is more sensitive to magnetic field interference; reset pin and crystal oscillator pin of the chip are more sensitive than other pins under action of direct injection interference.
Integrated Design of Solar Water Heater System and High-Rise Residential Buildings
Authors: Ding Fan , Hu Yan Zhe , Zang Jian Bin
Published: December 2013

This paper analyzes the potential of the integration of solar water heater systems and high-rise residential buildings in a perspective of Ecological Civilization and raised issues specific to high-rise residential. Against the prospect the use of solar energy for high-rise residential buildings, the author points out the appropriate solution. The paper stresses that the process of the integration of high-rise residential and solar water heater systems, is a multi-phase technology system and building system integration process, is the inevitable trend to achieve ecological modern urban development.
Study on Partial Discharge of Electric Equipment Based on Ultraviolet Imaging Technology
Authors: Cui Hao Yang , Xu Yong Peng , Wang Chao Qun , Yang Jun Jie , Zeng Jun Dong , Tang Zhong
Published: December 2013

The application of Ultraviolet Imaging Technology (UVIT) in the electric equipment Partial Discharge (PD) was proposed and the operating principle of Ultraviolet Imaging Technology Instrument (UVITI) was analyzed in the paper. By describing the current development trend of UV imaging technology in China and foreign country, the several factors influencing the detect accuracy of the UVITI was analyzed. The results show that: the environment temperature, the back light, the air humidity, the instrument gain level, the wind level and the measurement distance will influence the accurate measurement of PD level and location seriously. In order to detecting the PD level and locating the fault position accurately, electric equipment PD measurement should be taken in low environment temperature and humidity, short measurement distance and avoiding big wind. For the disturbing of environment noise on measurement signal, the instrument gain level should be improved.
A Fractional Order Circuit Model of the PT
Authors: Gao Feng , Liang Gui Shu , Liu Xin
Published: December 2013

This paper presents a new digital potential transformer (PT) model. Due to the effect of hysteresis and saturation phenomenon, the magnetization curve of iron core has a strong nonlinear. From the perspective of hysteresis effect of iron core, this article presents a PT core model using the theory of fractional calculus, then propose a new PT circuit model. The model simulates the nonlinear part of iron core using the fractional order expressions and can reflect the feature of saturation. Finally it shows the correctness and validity of the model through the theoretical analysis and simulation results.
Technique of Digital SPWM Inverter Based on PRE Control
Authors: Zhang Jie , Ma Hong Wei
Published: December 2013

A PRE control scheme in single-phase inverter is adopted, namely connecting the proportional component with repetitive controller in parallel. This control scheme not only retains the characteristics of fast dynamic response from proportion link ,but also absorbs the advantages of no steady-state error in repetitive control .When the system is in stable operation condition, repetitive controller is used to resist periodic disturbance and thus improve the steady-state performance. Contrarily, the proportional component can feel mutation of input error and produce accommodation immediately to ensure the systems fast speed of response .The comprehensive theoretical analysis of this control strategy is given, and the system is designed in Matlab based on this theory, besides, the control scheme is achieved in the DSP platform by using digital control algorithm. Simulation and experimental results prove that the proposed scheme can achieve good dynamic and steady-state performance.
DCM Analysis of ZVS PWM Full-Bridge Converter with Current Doubler Rectifier
Authors: Wang Jian Gang
Published: December 2013

The operation principle and the external characteristics in discontinuing current mode (DCM) are discussed for ZVS PWM Full-bridge Converter with current doubler rectifier (CDR ZVS PWM FB converter) .The converter operated in DCM remains the performances of the converter in CCM. This makes the converter achieve ZVS for the switches in a wide load range with the use of the energy stored in the output filter inductances, and the rectifier diodes commute naturally, therefore no oscillation occurs. Features of ZVS achievement for the switches in DCM are also included in this paper.