bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Unary Lattice Implication Algebra Equations on Interval Sets
Authors: Du Hao Cui , Sun Bin , Yao Ying Le
Published: December 2013

The concepts are re-defined on the interval sets which are filter, prime filter, LI-ideal, dual atom and convex sub-lattice in the lattice implication algebra. Three basic unary lattice implication algebra equations on the interval sets are researched. The necessary and sufficient conditions for existence of solutions for the equations are presented. And some properties of equation sets also are given.
Precise Large Deviation of Claim Surplus Process in a Renewal Risk Model with Random Premium Income
Authors: Dong Ying Hua
Published: December 2013

In this paper, we consider a nonstandard renewal risk model in which claim sizes and corresponding inter-arrival times form a sequence of independent and identically distributed random pairs. Each pair satisfies a certain dependence structure. In addition, premium income is described by a compound Poisson process. When the distribution of claim sizes belongs to the consistent variation class, we obtain precise large deviation of claim surplus process.
Object Tracking Based on Dual-View Stereo System
Authors: Fan Jian De , Zhu Jiang Bo
Published: December 2013

Tracking moving objects in dual-view stereo system is becoming a hot research area in computer vision. To capture the moving objects pixels more accurately, we proposed a new object tracking algorithm which first compute moving objects feature points and then match these points, finally connect the matching feature points and get objects motion trajectories. The algorithm was tested in the video sequences with resolution 640×480 and 768×576 individually. The results show that the algorithm is more robust and the trajectories of the moving objects tracked with our method are more accurate compared with current method of L-K optical flow.
An Improved Particle Swarm Optimization Algorithm
Authors: Ni Hong Mei , Wang Wei Gang
Published: December 2013

Niche is an important technique for multi-peak function optimization. When the particle swarm optimization (PSO) algorithm is used in multi-peak function optimization, there exist some problems, such as easily falling into prematurely, having slow convergence rate and so on. To solve above problems, an improved PSO algorithm based on niche technique is brought forward. PSO algorithm utilizes properties of swarm behavior to solve optimization problems rapidly. Niche techniques have the ability to locate multiple solutions in multimodal domains. The improved PSO algorithm not only has the efficient parallelism but also increases the diversity of population because of the niche technique. The simulation result shows that the new algorithm is prior to traditional PSO algorithm, having stronger adaptability and convergence, solving better the question on multi-peak function optimization.
Principal Component Analysis Based Underwater Object Recognition
Authors: Li Chen Ming , Chen Zhe , Shen Jie , Wang Xin , Wang Hui Bin
Published: December 2013

In this paper, the principal component analysis method is applied in the underwater image data for detecting the image objects. The system is designed to assist the underwater monitor system survey operations, specialized to the task of object identification. Firstly, the nature of the underwater is analyzed according to the image formation model and the appearance. Then, the discipline of the principal component analysis is theoretically analysis. Third, the principal component analysis method is applied in the underwater image for dimension reduction, extracting the image feather for recognition. Experimental results, which have been performed on a set of real underwater images, demonstrate the robustness and the accuracy of the principal component analysis in the task of underwater object recognition.
Study on 3d Flexible Pipe FEM Analysis by Spangler Theory
Authors: Xiao Jun , Zhang Xiao Yu , Chen Jian Zhong , Li Zhuo Qiu
Published: December 2013

Earth pressure can be divided into three kinds of load form by Spangler theory: vertical earth pressure, bed reaction and horizontal lateral pressure. According to Spangler theory, the level of static earth pressure presents a parabolic distribution in central angle bon both sides of the tubes. Used the glass steel pipe as the specific research object, Spangler theory applied to the three-dimensional buried tube model for finite element analysis, the analysis is divided into two situations: (1) the same soil, finite element analysis of different pipe diameter; (2) the same tube diameter, finite element analysis of different soil. This method can reasonably reflect the interaction of soil and structure, it is feasible. The complicated process of the finite element simulation of tube soil interaction can be avoided.
Applications of Slice Modeling Technology in Agricultural Products
Authors: Shi Lin Rong , Wu Jian Ming , Sun Wei , Wang Di , Zhao Wu Yun , Sun Bu Gong
Published: December 2013

Based on tuber size statistics commercially available Longshu 3, new Daping, Zhuangshu 3, and the typical geometry of the statistical value of the potato be accessed. With application modeling technology contours data were imported into Solid works to generate solid model of potato. Maize grain boundary slice profile image were collected with the digital camera, By dint of the application of image processing technology and slice shape modeling technology the various parts of maize grain (seed coat and horny endosperm, salty endosperm, germ) three-dimensional solid model was generated.
A New Approach to Calculating Feeder Size and Location with Simulation Software
Authors: Zhang Guo Hong , Li Rong De , Tian Chang , Qiu Ke Qiang , Zhang Xin Yu
Published: December 2013

A new approach of feeder calculation was introduced in this paper. By using the simulation software, the feeder size and location can be calculated easily and test by run simulation, the results can be seen directly. Take the rocker arm as an example, the method was introduced by using SOLIDCast.
Adaptive Synchronization of Fractional Hyper-Chaotic System with Unknown Parameters
Authors: Yang Li Xin , He Wan Sheng , Jia Jin Ping , Zhang Fan Di
Published: December 2013

In this paper, chaos synchronization of the modified Sprott E system is investigated. Based on the stability theorem for fractional systems, tracking control approach is used for the fractional-order systems with uncertain parameters. Meanwhile, suitable adaptive synchronization controller and recognizing rules of the uncertain parameters are designed. Numerical simulation results show that the method is easy to implement and reliable for synchronizing the two nonlinear fractional order hyper-chaotic systems.
Heuristic Dynamic Programming Iterative Algorithm Design Based on BP Neural Network
Authors: Zhao Yu , Yang Ji Ye
Published: December 2013

The time-delay delay phenomenon is a kind of widespread physical and biological phenomenon. The existence of time-delay not only give the stability of system analysis and controller design brings great difficulties but also usually make the systems unstable and even cause the system performance deteriorated. We use the adaptive dynamic iterative algorithm to solve this equation. By using the neural network to achieve the iterative algorithm, get the optimal control law of the systems with time delay. The simulation results show that the adaptive dynamic programming method to solve the optimal control of the nonlinear system is effective.
An Express Retrieval Method of Face Based on Semantic Features
Authors: Zhang Ming , Mu Hai Wei , Liu Xiang Lou , Zhao Dong Yan
Published: December 2013

The paper uses digital image processing technology, technology of face pattern recognition and traditional database retrieval technology, integrate image retrieval technology based on version and content, and avoid the complexity of matching image process. The experiments with 200 human samples, correctly retrieved for 155 people, exactly matched to 125. The recognition rate of the system is 75.55%, the average time of search is less than 0.1s. Experiments indicate this method has strong robustness. The semantic face image retrieval system using this method has the characteristics of fast, efficient, practical.
The Passive Target Motion Parameters Estimate Algorithm Based on Particle Filter
Authors: Yan Bing , Guo Hu Sheng , Li Xiang
Published: December 2013

A new passive target motion analysis (TMA) based on method a single seismic-filed vector sensor is designed using pitching angle and multi-path delay is studied. The state equation and measurement equation are established and analyzed systemically by improvement particle filter based on the measurements of both bearings and time delay that are collected by the sensor. The Monte Carlo simulation experiment results demonstrate that the algorithm has some advantages of fast convergence, high precision and stability.
An Efficient Sampling Method for the Interpolation/Extrapolation of Electromagnetic Responses in Time and Frequency Domain
Authors: Hao Hong Gang , Fang Wen Long , Li Na Na
Published: December 2013

The higher order maximal orthogonal vector basis functions are used to get targets sampling information in interpolation/extrapolation of electromagnetic responses in time and frequency domain. With the method, the computational complexity of sampling would decrease sharply without loss of accuracy. As a result, the proposed method solved the problem of high computational complexity and great resource consuming of traditional sampling method. Some numerical results are given to verify the high efficiency and accuracy of this method.
Towards Efficient Task Scheduling on 2D Reconfigurable FPGAs
Authors: Wang Peng , Zhang Jun Feng , Chen Xue
Published: December 2013

With the rapid development of dynamical partial reconfiguration technology, FPGA (Field Programmable Gate Array) is able to allow independent tasks to be executed concurrently without interfering with each other, which increases its flexibility and performance, but on the other hand leads to multi-task scheduling problem. The task scheduling in this paper is the problem of task sequencing, which adjusts the entering sequence of the incoming tasks with the consideration of the attributes of tasks and the utilization of FPGA. A conditional preemption based task sequencing method is proposed that allows tasks that arrive later to be executed in advance as long as the previous tasks can still be guaranteed to enter the FPGA on time. Simulations show that these methods can effectively decrease the waiting ratio of task sets, thus improving the flexibility and utilization of FPGA.
Towards Efficient Task Placement Selection on 2D Reconfigurable Devices
Authors: Wang Peng , Fang Tao , Zhang Jun Feng , Chen Xue
Published: December 2013

Current 2D FPGA allows independent tasks to run concurrently without interfering with each other, which makes it confront task placement problem. Task placement consists of placement management and placement selection. Placement management manages all of the available locations on the FPGA while placement selection selects the proper location for each incoming task from the current available locations. Since we have proposed a Vertex-Scan (VS) algorithm for placement management that can efficiently find all free locations on the FPGA, this paper focuses on the problem of placement selection for tasks. A cost function based placement selection method is proposed that formalizes the influence of both time factor and space factor on the generation of fragmentation in FPGA. Simulations show that compared with the other methods, our method can achieve the lowest ratio of waiting tasks and waiting time. In addition, our methods advantages become more prominent especially in the circumstances of medium or smaller task sizes, and shorter time intervals.
Study on Logistics Capability Evaluation of Wuhan City Circle Based on Principal Component Analysis
Authors: Wan Feng Jiao
Published: December 2013

On the basis of defining the meaning of logistics capabilities, we build logistics capability index system from economic base, logistics scale and information scale. Combined with relevant data, we study on nine cities of Wuhan city circle and evaluate logistics capabilities based on principal component analysis. Based on the main ingredient, principal component scores and sorting, we analyze the level of development of the city's logistics capabilities and influencing factors.
Kinetics Analysis of Wheat Straw Pulping Process
Authors: Cui Ming Xian , Song Wei , Liu Zong Yu
Published: December 2013

This paper analyzes the delignification mechanism of wheat straw pulping process. The lignin removal of pulping process is left in black liquor. The higher the black liquor lignin content is, the bigger the lignin of paper pulp is removed. The relations of black liquor lignin content and alkali concentration to pulping time are described in detail. The results show that delignification process is divided into two stages: quick and slow stage. The lignin removal rate in the first stage is much higher than the second, that is, lignin has been removed more sufficiently after quick stage. In first stage, reaction order of delignification is 1.0, and 0.7 with respect to OH-, the activation energy is 38.62 kJ • mol-1. The latter delignification also belongs to the first-order reaction and 4.4 with respect to OH-, the activation energy is 75.56 kJ • mol-1. Apparently, slow stage needs to consume large amounts of energy to removal lignin.
Effect of Rare Earth for Removal of Carbonyl Sulfide from Synthesis Gas
Authors: Zhao Hai , Liu Jun Qing
Published: December 2013

Fe-Mn metal oxides nanosized particles have been prepared by doping with La. The effects of promoters on the oxides were investigated by XRD, BET and other methods. XRD results revealed that the degree of crystallinity and particle size of mixed oxide phase decreased due to doping with La2O3. Addition of La led to a progressive increase in the surface area of the sample. Tests showed that the addition of 3 wt % La2O3 greatly improved the absorption sulfur capacity of the sorbent for COS removal.
Keywords: Hydrogen utilized; Carbonyl Sulfide; Doping; La2O3
Effects of Modified Glycerol Distillation Residues (MGDR) on the Performance and Hydration of Portland Cement
Authors: Li Wei Feng , Ma Su Hua , Shen Xiao Dong
Published: December 2013

The feasibility of modified glycerol distillation residues (MGDR) used for chemical additives of cement was studied. MGDR showed good grinding and strengthen effect which was similar with triethanolamine (TEA), and the performance of MGDR was better in PC 32.5. Samples with MGDR showed lower heat of hydration than samples with same dosages of TEA, and the initial heat rate of hydration was as the order TEA> TEA + MGDR> blank. The hydration products of samples with MGDR were also similar with TEA, but the former showed more AFt crystals and less Ca (OH)2.
A Study on the Spray Characteristics of SIDI CNG Engine Based on a Visualization System
Authors: Liu Yu , Zhao Guo Chang , Kou Zhi Hai , Chung S. S.
Published: December 2013

Compressed natural gas (CNG) is regarded as one of the most promising alternative fuels, is widely used for the automobile engines. In order to improve the thermal efficiency of CNG engine, the direct-injection (DI) technology has been adopted. The stratified CNG mixture can be ignited by the spark plug which is installed near the injector nozzle, so the lean combustion can be subsequently achieved. For the direct-injection spark-ignition (DISI) engine, the reliable ignition is a foundational problem for the reliable operation, so it is very important to study on the spray characteristics of DISI engine. In our study, a combustion chamber is designed and a visualization system is built. The DI CNG spray's injection process was digital recorded with the schlieren optical system under different experiment conditions. The spray characteristics of the DI CNG engine were analyzed with the experimental results.
Space-Time Modeling of Plug-In Electric Vehicles
Authors: Hou Xiao Fan , Wu Hong Bin
Published: December 2013

With the shortage of fossil energy and the worrying about environmental problems, renewable energy and electric-vehicle get rapid development. Against this background, an overview of power characteristic of electric vehicles is presented. Monte Carlo method is used to simulate the charging and discharging behavior of electric-vehicles, and the load curve of EVs of different scale is presented. It analyses the charging load characteristic in the uncoordinated charging mode and the discharging capacity curve in the vehicle-to-grid (V2G) mode in this paper. Under the software package of Visual C++ 6.0, it verifies the availability and feasibility through comparison and analysis, which lays a foundation for the large-scale development of electric vehicles.
Coordinated Control for Novel Full Hybrid Vehicles
Authors: Kong Zhi Guo , Zhang Hong Wei , Tang Zi Ning
Published: December 2013

In order to improve the performance of a new type of full hybrid electric bus, this paper puts forward a set of coordinated control method to adjust the operation of the engine and two motors. In the engine start-stop logic control, comprehensive consideration of SOC, the speed of the bus and the accelerator pedal stroke are performed, while hysteresis control is introduced to improve the stability of the control; In the engine working point adjusting control, not only the engine speed command rate of change was optimized, but also the output torque rate was optimized to match the air injection and exhaust, etc. Further, the method based on dynamic constraints was used to optimize the working point adjustment process. At present, there are hundreds of busses operates in route. Results verify the feasibility and effectiveness of the control method. The vehicle has good fuel economy, and the dynamic performance and driving comfort are also greatly improved.
Point-Location Problem for Indoor Daylight Factor Computations
Authors: Smirnov Vladimir , Rozovskaya Tamara , Semenov Vyacheslav
Published: December 2013

The paper presents the results of a comparative analysis of point-location methods for the computation of the daylight factor inside the rooms of irregular shapes with the use of hollow light guides. The daylight factor value for natural lighting provided by a set of light guides is computed in accordance with the Solovyovs procedure [; the following methods are considered as the point-location methods: the strip method and the ray-tracing method, both are modified for their use in the process of solution of the aforesaid problem. The results obtained show both the advantages and disadvantages of the aforesaid methods and allow the evaluation of the time-consumption value for both methods when applying in large rooms of irregular shapes.
Testing of Remote Monitoring Calibration and Diagnostic System for Electric Vehicle
Authors: Zhang Kai , Fan Lu Yan , Yin Qian Xi , Qu Da Wei
Published: December 2013

This paper introduces the electric car remote monitoring, calibration test and diagnosis system, which choose Changchun Unicom WCDMA as a medium of communication and hardware-in-loop system of Jilin University as test tools. Collecting operation data of the hardware-in-loop system through the 3g network, the data that verify the remote monitoring and diagnosis function. The marked ECU, which is Mattoon platform, sends commands to vehicle information terminal through the remote calibration software and realizes the function of the remote calibration in real-time monitoring mode.
Periodic Control of General Energy Flowing in Charging-Discharging-Storage Integrated Station
Authors: Yang Min Xia , Xie Da , Jia Yu Jian , Feng Jun Qi , Lou Yu Cheng , Zhang Yu
Published: December 2013

A novel scheme of charging-discharging-storage integrated station is put forward. In order to control energy/power flowing in the integrated station effectively, a new definition of general energy is fully discussed and its periodic characteristic is analyzed. General energy includes three parts: general energy of battery supply system, general energy of battery echelon utilization system and general energy of EVs, all of which is almost periodic. After analyzing steady operation curves of the three parts of general energy, their interrelation is discussed. On this basis, a periodic control strategy for general energy is proposed. Taking typical bus operation in Shanghai as a case, general energy curves of battery systems and EVs are described and analyzed under periodic control strategy, which obviously shows that the integrated station can maintain stable and economic operation by periodic control of general energy flowing in the integrated station.
Control Strategy of the Charging-Discharging-Storage Integrated Station on Reactive Power/Voltage of Power System
Authors: Lou Yu Cheng , Xie Da , Feng Jun Qi , Yang Min Xia , Zhang Yu
Published: December 2013

Compared to reactive power/voltage index and standard operation procedure (SOP) of power system, the reactive power/voltage index of charging-discharging-storage integrated station is defined, which includes voltage margin and voltage adjustable capability of integrated station ((ISVM & ISVAC). And then the reactive power compensation control strategy of integrated station is put forward and proved to be lossless in power. According to the reactive power regulation characteristic, a reasonable reactive power distribution between shunt integrated stations can be realized by the reactive power/voltage optimization algorithm. And the synthesis optimization can be achieved when AVC applied into integrated station, which will bring value-added benefit to power quality and greatly improve the grid reliability.
A Study on the Factors Affecting Consumers Adoption Toward Environmentally Friendly Car - Hybrid Car
Authors: Chung Leng Kooi , Abdul Hamid Abu Bakar
Published: December 2013

The aim of this study is to understand the consumer in the country of Malaysia which is one of the most developed countries in Southeast Asia. The study is being carried out to explore the consumer buying behavior in hybrid vehicle (HV). The objective of this study is to study which factors affect consumers hybrid vehicle buying decision. In addition, the study also in-depth analyzed whether there is any relationship between influencing factors and demographic factors such as gender, income, education and age. SPSS version 20.0 has been used for analysis the data information. 500 respondents will be selected to fill the questionnaire. The finding of this study provided empirical results to academician and vehicle producer in the field of green vehicle buying behavior in Malaysia.
Periodic Nanostructured Thin-Film Solar Cells
Authors: Hsieh C. F. , Wu H. S. , Wu Teng Chun , Liao M. H.
Published: December 2013

Si-based photonic crystal device such as solar cells have been developed and attract lots of attention. Whether what kind of different structures are used, two key problems are needed to investigate. One is the improvement of the optic-electric (or electric-optic) transformation efficiency. Another is the capability to modulate the light-emitting and detection wavelength for various industrial applications. The wavelength of the light emission and detection can also be further adjusted by changing the material band-gap. In this work, we develop the periodic nanoscale surface textured solar cells. The characteristics of top thin film textured solar cells is developed and estimated to see if the structure is worthy to be scaled from the modern micrometer (um) level down to the nanometer (nm) level continuously. The process of nm-scale textured Si optoelectronic device used in this work is fully comparable to the modern CMOS industry. Optimal Ge concentration in SiGe-based solar cells has been investigated qualitatively by the systemic experiments. With the appropriate addition of Ge to a SiGe-based solar cell, the short current density (Isc) is successfully increased without affecting the open-circuit voltage (Voc) and then the overall efficiency is successfully improved about 4 % than the nanoscale surface textured Si solar cell.
The Application of PLC in the Electric Vehicle AC Charging Technology
Authors: Xu Shi Ming , Lu Heng , Liu Shuo , Wu Feng
Published: December 2013

Electric vehicle charging, since the uncertainty of the travel area, and the different load control of the charging infrastructure grid and the different rates over time, needs to face different charging devices and use different charging parameters. The situation is very complex, so electric vehicle needs to be adaptive control for various situations in the charging process. Aiming at the communication between electric vehicle and power grid, there is no relevant national standards promulgated. After comparing several possible communication modes, I choose to use the PLC communication, and SDP for charging device to automatically obtain and connections. Charging parameter passing through the communication between the electric vehicle and charging facilities, in order to realize the adaptive control of electric vehicle charging.
Review of Research on Coordinated Charging of Electric Vehicles
Authors: Ni Feng , Liu Zhi Jian , Zhang Hao , Liu Shuo , Wu Feng
Published: December 2013

With the development of technologies of large capacity batteries and electric vehicles, the number of electric-car will increase dramatically. As a result, disorderly charging will cause a significant impact on the safe and economic operation of power system. Charging load has its adjustability on dual scale of time and space. With this feature, load dispatch in both time and space for dual scale is possible which has a positive effect on the operation of power grid. This paper introduces some recent research achievements on orderly charge control, including electric vehicle charging demand characteristics and load model. Explores the orderly charging, especially the control effectiveness of V2G mode on cases of peak-shift, coordinated operation of new energy, frequency regulation and other aspects. Orderly control strategy for electric vehicles is also put forward. Finally, points out the deficiencies of current research and prospects for future.
An Lectotype Analysis of the Architectural Structure of the Hmong in Hunan
Authors: Tang Xi Ya , Liu Qiong , Zhong Chen
Published: December 2013

The residential buildings of the Hmong in Hunan fall into the typical pole-railing constructions in southern areas with the maintenance components detached from bearing components, which is very suitable in mountainous regions and rainy weather. The architectures are usually called the stilted buildings and the black-tile roofed houses. The manifestation of the Hmong architecture are not all similar because of the different topography, climate, political culture and the economy and traffic condition; There are slope foot ,flat foot and ground foot according to the building structure; And according to the building materials, there are pure wood structure, stone wood structure, brick wood structure and earth wood structure.
The Mechanism of Action of the Low Carbon Building Management Base on Structural Equation Modeling
Authors: Chen Ping Ping , Chen Yi Qi
Published: December 2013

The empirical research on the mechanism of the low carbon building management by using the method of structural equation modeling.Firstly, analyze and summarize the affecting factors of the low carbon building management, and constructed the theoretical model, and then designed the questionnaire to collect data, and explored factor structure by analyzing the survey recovery results through reliability analysis and validity analysis. Then used Amos software to test the theoretical model, and found that the environment and the project characteristics affect evidently the project planning through the rest results effects through the test results, and the main character has a significant impact on coordination.
Hygrothermal Behavior of Thermal Insulating Material Based on Technical Hemp and its Application in Construction
Authors: Zach Jiří , Hroudová Jitka , Sedlmajer Martin
Published: December 2013

Natural insulation materials have great potential of development given the contemporary requirements of the society in terms of reducing the energy demands of the production of building materials and the reduction of CO2 emissions. Natural fibers are characteristic by their high moisture absorption and combustibility. The paper describes the results of research in the field of heat and moisture transfer within the structure of insulating materials based on natural fibers (hemp). The results of the experiments provided input data for computational simulations of hygrothermal behavior of hemp based fiber insulation applied in building envelopes.
Decorative Arts of Gates Detail Components in Chinese Traditional Architecture
Authors: Tang Xi Ya
Published: December 2013

Gate decoration art is one of Chinese traditional architecture decoration. It not only has own structure form and material form of building passageway against with that of other nations in the world, but so is a cultural background miniature of Chinese nation, and it is a material carrier of folk culture and decorative pattern. Decorative arts of gates detail components in Chinese traditional architecture have contained abundant aesthetic value and cultural connotation, all of this endowed gate decoration art with secret oriental color.
Prediction Study of Capillary Rise Height on Unsaturated Soil
Authors: Wang Nian Qin , Wang Qing Tao , Liu Xiao Ling , Pang Qi
Published: December 2013

Based on the understanding of diseases of building’s foundation and manmade slope caused by water capillary rise, this thesis carried out a large number of laboratory tests by selfdeveloped absorption permeameter for unsaturated soil, in order to explore the capillary transport law of unsaturated soil. The thesis obtains some valuable results and conclusions: The moisture content shows minishing trend as the seepage fronts increasing, and reflects the gravitational potential of normal relations with the capillary action; (2) the water seepage frontal Hω% relation curve has no obvious inflection point, but the initial water content has an certain influence on the capillary moisture content distribution, the moisture content uses the initial moisture content of 12.5%, 9.8%, 8.0% and5.3% for testing showed an increasing trend at 4 cm and 16 cm sections, and the moisture content at the same section increased with the initial moisture content increasing, this reflects the rule that the smaller the moisture content is, the greater the matric potential, the water absorption capacity becomes stronger. (3)The moisture content difference between 4 cm and 16 cm of the initial moisture content is 12.5%, 9.8%, 8.0% and 9.8% is 1.48 %, 1.5 %, 1.7 % and 2.2 %, indicating that the smaller the initial moisture content is, the difference at the vertical section is greater. Finally, based on the relationship of Hω% curve, the thesis establishes the grey correlation prediction model, and forecasts the maximum capillary height of Lishi loess is 182cm.
Explore on Design Strategy of Green Materials on Building Based on Low-Carbon Background
Authors: Ye Jian Gong
Published: December 2013

from the perspective of sustainable development, combined with some construction examples at home and abroad .This article focus on how to save energy in using solar, wind, water, plants in building design, in order to provide reference of architectural creation for today's
Study on the Shear Strength Parameters under Different Freezing and Thawing Cycles of Soil Slope in China
Authors: Wu He , Ge Qi , Tian Jing Bo
Published: December 2013

In seasonal frozen regions, shallow landslide hazards in soil slopes usually happen. The type of failure surface is always on the freezing and thawing surface in the soil slope. So the direct influence factor of soil slope failure is the soil shear strength of the freezing and thawing (F-T) surface. The shear strength of the soil is determined by the two parameters of Cohesion c and Friction angle φ. In this study model experiment of F-T soil interface with different aggregate materials is designed by alternating the F-T cycle times, then the parameters c and the φ were obtained. Finally the deterioration modal of the two shear strength parameters of soil interface was put forward. The results demonstrated when the slope stability in the seasonal frozen regions was analyzed using shear strength reduction method, the two deterioration modals can provide the data reference for the analysis.
The Current Situation, Opportunities and Challenges of Green Construction and Sustainable Development in Chinese Airports
Authors: Xu Jun Ku , Sun Shi Man
Published: December 2013

The authors analyze the current situation, opportunities and challenges of green construction and sustainable development in Chinese airports; also give their advices or suggestions on green construction and sustainable development of domestic airports in China.
The Study on a Simplified Model of Photovoltaic Power System
Authors: Shu Xin , Zhou Shi Ping , Xia Yong Jun , Hu Gang , Lei Yang
Published: December 2013

As the proportion of photovoltaic power increasing, the impact on the power system is evident. An accurate mathematical model for PV power generation system is necessary. This paper demonstrates the detailed mathematic models for PV power generation system consisted of PV cell, converters, flow model are summarized. This work might provide a generic PV power system models for the research of characteristics of PV generation system and its grid-connected operation.
Production of Partition Blocks from Synthetic Gypsum
Authors: Fridrichová Marcela
Published: December 2013

The task is solved in connection with Ministry of Industry and Trade project which is involved in development of a complex building programme based on high quality gypsum binder from secondary raw materials. Within one of sub-stages a solution of production of small plaster elements is subject of the project which should present a basic unit for construction of interior plaster partition walls. In the framework of the task a cast of plaster shaped block was carried out using a pilot form of own production. A plaster produced in optimised pilot way from the synthetic gypsum modified with plasticizer and retarding additive was used as a filler binder. After demoulding the produced block was exposed in laboratory environment and tested for setting of selected required properties according to standard EN 12859 (dimensions, density, flatness, tensile strength on bend, pH).
Advances in Working Medium for Organic Rankine Cycle
Authors: Lv Han , Jiang Wei Ting , Zhu Qun Zhi
Published: December 2013

Organic Rankine cycle is an effective way to recover low-grade heat energy, working medium is an important part of the cycle, it is one of the important factors that affects its performance. This paper introduces the working principle of organic Rankine cycle, composition, and it analyzes the excellent characteristics of medium, and the current research advances at home and abroad. Finally, aiming at existing problems, it puts forward the research direction and the key of development in the future.
Study on Gas Turbine-Based CCHP System with Multi-Objective Evaluation Index
Authors: Sun Dan Dan , Yang Cheng , Zeng Fei
Published: December 2013

Currently, there are many evaluation indexes for gas turbine-based combined cooling, heating and power （CCHP）. In this paper, a multi-objective evaluation index (MEI) model was suggested and weight coefficients were considered in the model. The CCHP system evaluated in this study was composed of gas turbine + heat recovery steam generator (HRSG ) + LiBr absorption chiller. The gas turbine-based CCHP system was evaluated and the component capacity was optimized with the proposed MEI. The study provides a reference for the allocation and operation of gas turbine-based CCHP.
Research and Application on the Dynamic Simulation of Natural Gas Pipeline
Authors: Gao Lan Zhou , Guo Yong Hui
Published: December 2013

Based on the fundamental flow equations of high-pressure gas pipeline, the numerical solution for unsteady-state flow was studied with the Central difference scheme. Considered the energy equation and urban gas regular, the problem of low calculation precision caused by ignorance of the energy equation was solved. During the variation of gas consumption with time, the dynamic simulation program was generated. Finally, a numerical example of engineering application was presented .
Experimental Study on Combustion Reaction between Silicon and Nitrogen in Transport Bed
Authors: Yin Shao Wu , Wang Li , Tong Li Ge , Liu Chuan Ping , Zheng Xing Long
Published: December 2013

Combustion reaction between silicon powders and nitrogen in transport bed was studied. The reaction temperature ranged from 1523 to 1653 K, and the reaction time ranged from 0 to 2.7 min. The phase compositions, morphologies and chemical composition of the products were analyzed by X-ray diffraction, scanning electron microscopy and O/N determinater, respectively. The experimental results showed, in the case of silicon powders with particle size of 2.2 μm, the conversion rate of silicon was 61.9% at reaction temperature of 1653 K and reaction time of 2.7min, and the products mainly comprised amorphous silicon nitride powders.
Research on the Applications of Heat Pipes in Cooling Aircraft Electrical Equipment
Authors: Zhao Guo Chang , Lu Tian Dong , Song Li Ping , Cao Lei , Zhang Wei
Published: December 2013

In order to ensure proper temperatures for electronic equipment and to meet the increasing heat dissipation capacity needs of airborne electronic equipment, a suitable heat-pipe for use in aircraft equipment needs to be found. Considering both the acceleration and the changes in tilt angle of the aircraft, performance analysis of five main types of heat-pipes showed that dual compensation chamber loop heat pipe and micro-channel plate heat pipe were the most suitable for use in airborne electrical equipment.
Research Status and Development Prospect of Optical Fiber High-Temperature Sensors
Authors: Zhao Guo Chang , Tong Xian Yi , Song Li Ping , Zhao Chun Lei , Li Guang Chao , Kou Zhi Hai , Mao Xiao Dong , Peng Da Wei , Liu Yu
Published: December 2013

Accurate temperature measurement needs in both research and industry have become more demanding and traditional temperature measurement technologies are struggling to keep up. Optical fiber thermometers have many unique advantages and are an option with much potential in the area of high temperature measurement. Research shows that fiber optic temperature sensors are capable of making accurate and precise measurements in a wide range of harsh conditions where other measurement technologies cannot and are a cost effective option in situations where traditional measurement technologies are currently used. Several typical high temperature fiber optic sensors are discussed in detail, focusing on the principle of operation, advantageous characteristics, and recent research developments, with the aim of aiding in further work with fiber optic thermometers.
Experimental Research on the Effect of Cross-Wind to Wet-Cooling Tower Performance
Authors: Wang Qing Yang , Sun Tian Yu , Zhang Jian , Ren Jian Xing
Published: December 2013

Environmental cross-wind has a influence on cooling capacity of wet cooling tower to a great extent in power plant.The variation of circulating-water temperature difference (Δt) and cooling coefficient of efficiency(η) with cross-wind velocity, circulating water inlet temperature and flow rate, are shown under cross-wind conditions, compared with cases without wind. By using experimental platform of cooling water system based on 300MW thermal power unit,it is found that with cross-wind velocity increasing,cooling temperature difference and cooling efficiency decrease first then increase at the knee point when the velocity value is 0.8m/s. In addition, the correlation betweenΔt ,η and parameters,such as circulating-water inlet temperature and flow rate, is derived for cases with windless conditions.
Study on Cost Allocation in Marine Diesel Engine Cogeneration System
Authors: Zhang He Fu , Zhou Song , Wang Zhi Yu
Published: December 2013

Electricity and high-temperature heating steam are the products of marine diesel enginecogeneration system, and the heat-electricity cost allocation ratio impact cogeneration systemoptimization directly. This paper described several existing cost allocation methods, and applied thereduced exergy method to specific marine diesel engine cogeneration system, then, established thecost allocation model to derive the detailed process and results of calculating heat-electricity costallocation ratio, and draw an conclusion that the reduced exergy method is the most reasonablemethod of cost allocation.
A Study of Multi-Objective Load Optimal Dispatch in Thermal Power Unit Based on Improved Particle Swarm Optimization Algorithm
Authors: Wang Ai Chen , Pan Wei Guo , Wang Wen Huan
Published: December 2013

In order to fit in with the demands of the development of electricity market in China, a multi-objective optimization mathematical model is presented to dispatch load within the units, taking economy, environmental protection and quick responsiveness to dispatching commands into consideration at the same time. And take the minimal whole plants power-supply coal cost rate, the minimal pollutant emissions and the minimal load adjusting time as these three objective functions respectively. The four constraint conditions are unit power balance constraint, load bound constraint, ramping constraint and pollution discharge standards constraint. An improved particle swarm optimization algorithm is used to get the Pareto solution set. The optimal solution was obtained by using the method of multi-attribute decision making, through sequencing the solution set by comprehensive evaluation. A case study based on a power plant with 4×600MW units was carried out. The result shows that the method can solve the multi-objective optimal load distribution problem accurately and quickly, and get the good effect in energy conservation and emissions reduction.
Modification Research on the Tube Layout of One 300MW Unit Condenser
Authors: Cheng Qi , Zhang Li , Wu Yin Jun
Published: December 2013

In the thermal power plant, as an important auxiliary equipment of turbine, the condenser plays an important role in the normal operation of power plant. At present, the domestic operating unit has a large number of old condenses, which has low efficiency and emerging problems because of the increasing running time. Therefore, the transformation of old condenser becomes an important means to tap the potential of the old unit. In this paper, we transform one 300MW unit condenser with its tube layout, then through the numerical simulation and date analysis of the condenser before and after transformation to explore the possibility of modification.
Numerical Simulation of Condenser Combining with Low-Pressure Exhaust Hood and Condenser Throat
Authors: Wu Yin Jun , Zhang Li , Cheng Qi
Published: December 2013

In order to obtain the more real condition of the flow field at condenser, the commercial software FLUENT is used to simulate the flow field of the condenser tube bundle area, alone or coupling with the low-pressure exhaust hood and condenser throat. The analysis indicates that the calculation result of combined model is different from the single calculation result of condenser tube bundle area. The flow field of condenser tube bundle area is strongly influenced by low-pressure exhaust hood, the frustums diffuse-angle, the low-pressure heater and the injection of the exhaust steam from the small turbine. The uneven velocity distribution at the outlet of the throat has great influence on the heat exchange of condenser tube. Combined numerical simulation gives more reasonable result.
The Numerical Analysis of Spiral Heat Exchanger
Authors: Li Xin Jun
Published: December 2013

The lumped parameter method was used to establish a mathematical model for the spiral heat exchanger with complex structures and specific heat transfer. By implementing the finite difference method, the differential equation was discretized, and then the steady temperature field of the spiral heat exchanger and the dynamic response of temperature can be obtained under boundary conditions and initial conditions. And the essential correctness and measurement accuracy of the model was proved by fluent. The results show that this model can simulate the temperature field and the dynamic response of it well.
Analysis on the Heat Transfer Performance of Jacketed Tube Heat Exchanger with Different Finned Array
Authors: Zhao Zhong Chao , Mi Hao Jun , Yun Long
Published: December 2013

The heat transfer performance of heat exchanger dependents on the pattern of finned array. The heat transfer coefficient of jacketed tube heat exchanger with and without finned array was investigated by computational fluid dynamics. The results reveal that: the heat transfer coefficient of jacketed tube heat exchanger with in-line-fin and staggered-fin increase to the 87.8% and 98.2% of that without finned array, respectively, and with 35.1% and 37.6% increments of pressure drop correspondingly. The heat transfer coefficient of heat exchanger with staggered-fin increased to 5.4% compared with that with in-line-fin.
Analysis of Thermodynamic Performance in NH3/CO2 Cascade Refrigeration System
Authors: Duan Rui , Cui Guo Min , Zhu Qun Zhi
Published: December 2013

The advantage and application of NH3/CO2 cascade refrigeration system were analyzed . The principle and composition of cascade refrigeration system were outlined . The cascade refrigeration system using NH3 /CO2 as refrigerant were studied theoretically and the COP were calculated .
Non-Deterministic CFD Simulations on the Effect of Uncertain Tip Clearance on an Axial Rotor Performance
Authors: Liu Zhi Yi , Wang Xiao Dong , Kang Shun
Published: December 2013

In the present paper, the non-intrusive Probabilistic Collocation (NIRPC) method is introduced in detail and used to simulate the effects of tip clearance uncertainty on the aerodynamic performance of NASA Rotor 37, which is combined with a commercial CFD software. The tip clearance height is supposed to be a stochastic variable in Beta distribution with four schemes of uncertainty in the random height of the plain tip clearance, the leading edge, the trailing edge and both the leading and trailing edges, respectively. The statistical properties of total performance of the rotor and flow structure within the blade passage in different flow conditions are analyzed. The results show that the Std. of total performances caused by the uncertain plain tip clearance decreases with reducing of the outlet pressure. The maximum of the standard deviation of Mach number appears in the regions where the leakage flow, the shock wave and the separation flow locate, which decreases from the tip to the hub. When the tip clearance is linear distributed, the uncertainty of tip clearance height at the leading edge is the main factor under high mass flow conditions. With the mass flow reaches to choking point, the Std. of total performances caused by the uncertainty of tip clearance height at the trailing edge drops sharply.
The Velocity Distribution for Ferromagnetic Fluids
Authors: Li Ming Jun , Liang Kai Fu
Published: December 2013

The magnetic fluids are assumed non-conductive with few free electrons existing, then the boundary layer equations are obtained for two special non-conductive ferromagnetic fluids, i.e. non-conductive Poiseuille flow and Couette flow, and the velocity distribution are found to be parabolic.