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November 30,2014
Volume 7,Issue 22
Pages -
Subject Area:Atomic Fission Pile Thermotechnical and Waterpower,Drilling Engineering,Energy-saving Technology,Geothermalenergy

Title: Transient analysis for once through steam generator of sodium cooled traveling wave reactor

Authors: WEI Hongyang, ZHANG Dalin, HUANG Siyang, TIAN Wenxi, SU Guanghui, QIU Suizheng
PP: 2298-2306
Abstract: In this paper, the fixed model method was used to simulate the once through steam generator (OTSG), and its character of steady state was researched. The transient performance of the OTSG under loss-of-flow accident and reactivity insertion accident were analyzed. The results showed that the reactor should be shut down due to the heat transfer deterioration in the core during the loss-of-flow accident. During the reactivity-insertion accident, the increasing core power will result in overheating in fuel rods, which might lead to fuel clad failure and threat the safety of the reactor.
Keywords: nuclear power engineering and techndogy; traveling wave reactor; once through steam generator; reactivity insertion; loss-of-flow

Title: Sub-channel analysis for mixed spectrum super-critical water cooled reactor

Authors: SHEN Danhong, LIU Xiaojing, CHENG Xu
PP: 2291-2297
Abstract: The thermal hydraulic performance of the proposed mixed spectrum super-critical water cooled reactor (SCWR) core in sub-channel scale was investigated in this paper. Using the coupled core simulation results as boundary condition, the sub-channel calculation was performed to obtain the thermal hydraulic parameters in each sub-channels and fuel rods. The effect of the key thermal hydraulic models on the sub-channel results were discussed, which will provide useful information for the future study.
Keywords: atomic fission pile thermotechnical and waterpower; mixed spectrum super-critical water cooled reactor; sub-channel analysis; model sensitivity analysis

Title: Geodetic coordinate system transformation programming based on VC

Authors: LIU Gen, ZENG Fanhui
PP: 2285-2290
Abstract: With the development of space position technology, coordinate system transformation has been used more and more widely. In this article, the model of coordinate system transformation, which is generalized geodetic coordinate differential equation, is deduced according to the relationship of space geodetic rectangular coordinate system and geodetic coordinate system. Then geodetic coordinate system transformation programming is elaborated based on VC, which has practical and applied value.
Keywords: other subject of surveying technology; VC; generalized geodetic coordinate differential equation; programming

Title: Fusion method comparison of TerraSAR-X and QuickBird images

Authors: SHAO Zhude, KE Changqing
PP: 2278-2284
Abstract: Based on TerraSAR-X and QuickBird images with high spatial resolution,after filtering, pre-registration, etc., we use Brovey transform (BT), principal componentanalysis transform (PCA), intensity, hue, saturation (IHS)transform, high-pass filter (HPF) and wavelet transform (WT) to conduct fusion test, and select the mean, standard deviation, information entropy, average gradient, spectral distortion degree and correlation coefficients to evaluate the quality of fusion results. The results show that WT method has the best visual interpretation effects.The average spectral correlation coefficient and average information entropy of bands are the highest, which are respective 0.97 and 0.67. The fused image with WT contains and inherits the most abundant information. The fused image with HPF has bright speckles, but it has the minimum average spectral distortion of band.The visual interpretation effects of BT, PCA and IHS are bad. But IHS has the highest average gradient 7.79.The contrast of details of the fused image is obvious.Considering all the indicators, the fusion method based on wavelet transform has the advantages in fusion of TerraSAR-X and QuickBird images with high spatial resolution.
Keywords: photogrammetry and remote sensing technology; fusion method; quality evaluation; wavelet transform; TerraSAR-X; QuickBird

Title: Research of multi-texture extraction methods on SAR image

Authors: CHEN Jun, DU Peijun, TAN Kun
PP: 2270-2277
Abstract: A systemic comparison is done on main texture extraction methods for synthetic aperture radar (SAR) image, including: multi-scale wavelet transform method, variogram of geostatistics method, the fractal methods of box counting, Gaussian Markov mixture model method, gray level co-occurrence matrix method and occurrence model method. These measures as well as their combinations are used to extract textural features from SAR image. Support vector machines (SVM) is used as the classifier for its better performance on classification. Based on these experiments, two conclusions can be drawn: 1) As for single texture extraction methods, occurrence model method is a better way to extract textural features from SAR image; 2) As for two methods’ combination, the union of gray level co-occurrence matrix method and fractal methods of box counting is the best combination to extract textural features from SAR image.
Keywords: photogrammetry and remote sensing technology; feature extraction; texture; occurrence model; fractal theory; gray level co-occurrence matrix

Title: Transformation from pick arrangement graph of drum to the data of cylindrical coordinate based on secondary development of CAXA

Authors: SHI Xiubao, YUAN Bo
PP: 2266-2269
Abstract: The mathematical formula of transforming pick arrangement graph of drum to the data of cylindrical coordinate was obtained from the research of pick arrangement graph.The program based on the mathematical formula was developed using secondary development of CAXA which used Visual C++6.0 as development environment.This program can transform pick arrangement graph of drum to the data of cylindrical coordinate efficiently and accurately, which provides convenience for analying cutting patterns and 3D model building.
Keywords: mining mechanical engineering; drum; pick arrangement; CAXA; secondary development

Title: Influence of coagulant dosage on zeta potential of coal slurry

Authors: XU Ning, TAO Xiuxiang
PP: 2262-2265
Abstract: In this paper, zeta potential was applied to describe its characteristics of settlement, and then the effects of dosage on zeta potential were investigated with typical metallic minerals used as coagulants, in order to provide theoretical guidance for the industrial practice in coal preparation plants. It was indicated that all the coagulants selected were able to reduce particles’ zeta potential, ranked CaCl2>MgSO4>PFC>PAC>FeCl3>Al2(SO4)3>CaO>KCl>NaCl. And for all the agents used, the change regulations of zeta potential were similar, when the inputs were the same. And the more coagulants were added, the slower the zeta potential reducing rate became.
Keywords: mineral processing engineering; coagulant dosage; zeta potential; coal slurry

Title: Effect of feed solids on performance of pulsating high gradient magnetic separation of rod matrix

Authors: DING Li, CHEN Luzheng, HUANG Jianxiong, ZENG Jianwu
PP: 2257-2261
Abstract: In order to study the effect of feed solids on the pulsating high gradient magnetic separation (PHGMS) performance, so as to provide a basis for feed solids of rod matrix high gradient magnetil separation (HGMS). The arrangement of different spacings between rods in a single matrix layer plays a decisive role on the distribution of magnetic field and the dynamics of magnetic particles in the matrix, thus generating a significant influence on the performance of PHGMS. In the present work, the effect of feed solids on the PHGMS performance of ultrafine hematite is investigated with a 3 mm rod matrix by slice-matrix analysis (SMA) method. The results of investigation indicate that different spacings between rods in a single matrix layer of rod matrix have different maximum feed solids, that means there is a maximum feed solids for a given matrix, beyond which, the performance of PHGMS deteriorates significantly.
Keywords: mineral processing engineering; pulsating high gradient magnetic separation; rod matrix; feed solids; hematite

Title: Performance evaluation of a cationic gemini surfactant fracturing fluid

Authors: FAN Zhenzhong, AN Huiming, LIU Qingwang, WANG Jigang
PP: 2252-2256
Abstract: Preferred cationic gemini surfactant fracturing fluid formulation is 2.0% 16-2-16+0.7% NaSal. When the shearing time is 0.5 h and 1 h under the shearing rate of 170 s-1, the viscosity is greater than 90 mPa穝 and basically unchanged. Compared with guar fracturing fluid, the flow conductivity of cationic gemini surfactant fracturing fluid is higher and sand-carrying performance is also better. This fracturing fluid can be broken when it encounters oil or be diluted with formation water. So there is no need to add the breaker. Microstructure shows that cationic gemini surfactant fracturing fluid is a three-dimensional network structure formed by surfactant rod-like micelles rapid growth and intertwining. The viscosity of the solution increases and shows strong viscoelasticity.
Keywords: drilling engineering; cationic gemini surfactant; fracturing fluid; performance; flow conductivity

Title: Lighting system design optimization based on DIALux

Authors: CHANG Fangyuan, CUI Xiaofei, HE Yiheng, ZHAO Shuqiang
PP: 2246-2251
Abstract: Aiming at the problem of energy waste caused by classroom lighting, the research group designed the classroom lighting automatic control system. Starting with the electricity consumption from the classroom lighting, interpolation analysis and data fitting of light source coordinates were carried out on classroom model by using the Matlab. LINGO and the lighting design software DIALux was used for classroom lighting simulation test. It was found that uneven distribution problem existed in the traditional arrangement of lighting. We proposed a lighting arrangement scheme which was relatively efficient and uniform. Besides meeting Commission Internationale de l′Eclairage (CIE) standards, this scheme increased the classroom effective illumination area, improved the power utilization of classroom lighting, which could build a conservation-minded campus and achieve energy-saving and emission reduction targets.
Keywords: energy-saving technology; classroom lighting; DIALux modeling; energy saving and emission reduction

Title: Comparative analysis of energy consumption of per carrier frequency based on Matlab and DeST models

Authors: ZHU Chengyu, SHU Huaying
PP: 2237-2245
Abstract: According to the characteristics of mobile communication base stations, we summed up the impact factors of communication base station energy consumption, and analyzed the impact of environmental factors and internal equipment on energy consumption of base station, and established a mathematical model. Energy consumption model of mobile communication base stations was establiched respectively using Matlab and DeST software, and model simulation results of these two types were compared. The results showed that the differences was small in the simulation results of the two models. Further analysis and discussion about limit value of energy consumption of the base station single-carrier was made, and Matlab model was wsed to obtain the the concrete base station model single carrier frequency energy consumption limits, then they were verified by DeST model, which provided guidance to reduce energy consumption of the base station single-carrier frequency.
Keywords: energy-saving technology; mobile communication base stations; energy saving; DeST; Matlab; energy consumption analysis

Title: CFD simulation of 3D aerodynamic characteristics of a wind turbine airfoil

Authors: PAN Xiaotao, HUANG Mingfeng, LOU Wenjuan
PP: 2231-2236
Abstract: In this paper, computational fluid dynamics (CFD) method was used to calculate the 3D aerodynamic characteristics of a wind turbine airfoil. The calculated results was compared with wind tunnel test data, which showed that the aerodynamic characteristics of wind turbine airfoil have noticeable three-dimensional effect. Twist angle and the slop of the 3D model have significant influence on the aerodynamic characteristics. The maximum lift coefficient decreased with the increase of twist angle. The maximum lift coefficient obtained from the 2D model is smaller than that from the 3D model.
Keywords: wind energy; computational fluid dynamics method; wind turbine; airfoil; 3D; aerodynamic force

Title: Study on double phosphorus diffusion of monocrystalline silicon solar cells

Authors: YUAN Ze, LI Ping, ZHAO Zengchao, LU Chunxi, LIU Aimin
PP: 2227-2230
Abstract: In the production process of monocrystalline silicon solar cells, the experiment of the double phosphorus diffusion gettering effect was carried on. The results showed that the conversion efficiency (Eff) of solar cells prepared by double phosphorous diffusion as well as its open circuit voltage (Uoc), short circuit current (Isc) and the parallel resistance (Rsh) data was higher by comparing with single phosphorus diffusion, which illustrated that on the effect of gettering, the diffusion process by using double phosphorus diffusion was better than single phosphorus diffusion for the monocrystalline silicon solar cells.
Keywords: solar energy; monocrystalline silicon solar cells; double phosphorus diffusion; gettering

Title: Research progress of quantum dot-sensitized solar cells

Authors: ZHANG Wenming, LI Ling, ZHANG Huayan, LI Xiaowei, ZHAO Xiaohui, DONG Guoyi
PP: 2221-2226
Abstract: Quantum dot-sensitized solar cells (QDSCs), which have a high theoretical conversion efficiency and low product cost, have received wide attention in the solar industry. The basic structure and operating principle of QDSCs are presented. Optimization and improvement of the structure of nanocrystalline photoanode, and the structure classification and the preparation methods of quantum dots (QDs) are described. The development prospects of sensitizers and electrodes are also briefly described. Finally, the problems faced by QDSCs are summarized to indicate the development direction of QDSCs in future.
Keywords: solar energy; quantum dot-sensitized solar cells; review; photoanode

Title: Research of wellbore numerical simulation in enhanced geothermal system

Authors: ZHU Jialing, HUANG Xiaoxue, LI Jun
PP: 2214-2220
Abstract: This revien focuses on numerical simulation of wellbore in enhanced geothermal system (EGS). Numerical models of wellbores and coupling of reservoir with wellbore in EGS are reviewed. Wellbore models are classified by dimensions, calculation method of wellbore heat transfer, numerical model of wellbore flowing. The reriew analysis show that one-dimensional model can adapt to wellbore direction flexibly, heat transfer mainly works on the initial stage of operation, coupling of reservoir with wellbore has significant differences.
Keywords: geothermal energy; enhanced geothermal system; review; wellbore numerical simulation; coupling

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