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ISSN 1674-2850
CN 11-9150/N5
 
Current Issue
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June 30,2016
Volume 9,Issue 12
Pages -
Subject Area:Applied Meteorology (Concrete Application ? Relevant Subjects),Atmospheric Sciences,Geography,Foundational Subject in Materials Science,Functional Polymer Materials
 
Title: Optimization calculation of injecting nitrogen for steamnitrogen assisted gravity drainage in super-heavy oil reservoirs
Authors: PANG Zhanxi, LÜ Xiaocong
PP: 1275-1280
Abstract: The technology of steam assisted gravity drainage to parallel horizontal wells in developing super-heavy oil reservoirs shows that the unique advantage. Based on one dimensional steady heat transfer theory, the formula of optimum thickness of nitrogen insulation layer is deduced. The injecting nitrogen rate of steam and nitrogen injected together is obtained on considering nitrogen dissolution into heavy oil by the theory of steam-nitrogen assisted gravity drainage. Aimed at the Block of Du84 with top water layer in Liaohe oil field, the optimum injection nitrogen of steam-nitrogen assisted gravity drainage are that the minimum thickness of nitrogen layer is 12.06 m, pre-nitrogen injection volume is 4.786×105 m3 under standard state, the injection rate of nitrogen is 5 957.06 m3/d under standard state when steam and nitrogen are injected into reservoirs together.
Keywords: oil-gas field development engineering; super-heavy oil reservoirs; optimum thickness; injecting rate; steam chamber; material balance
 
Title: Discrete element simulation of different magnetic properties affecting the behavior of mineral magnetic separation
Authors: YOU Peihai, ZHANG Yishun, SHI Changliang, ZHANG Binghao, YANG Jiping
PP: 1268-1274
Abstract: Magnetic enhancement technology can effectively improve the effect of mineral magnetic separation effect, and the research of magnetic enhancement mechanism is of signality. Based on PFC2D discrete element method software, the particle dynamics characteristic mechanism before and after magnetic enhancement under the conical magnetic medium in the magnetic separation process is numerically simulated. Results show that after magnetic enhancement, at the beginning of separation, the displacement of magnetic mineral grains responded ahead, respond number increased, the ability to overcome the cover pressure of other mineral particles was enhanced. In the middle, the maximum velocity of magnetic particles improved from 0.277 6 m/s to 0.832 9 m/s, maximum mean unbalanced force improved from 0.161 3 N to 0.202 7 N, and response became more intense. In the last, the magnetic particles damping time became shorter, and the adsorbed stability increased.
Keywords: mineral processing machinery; magnetic separation; magnetic enhancement; discrete element method; numerically simulation
 
Title: Forecasting model for visibility levels in foggy weathers based on principal components analysis and BP neural network
Authors: HUANG Zheng, BAO Yunxuan
PP: 1262-1267
Abstract: Based on the hourly weather data, the environmental atmosphere quality monitoring data and visibility data from 2012 to 2014 in the Kunshan city of Jiangsu province, the correlation coefficient between visibility and different variables was analyzed and a three-layer BP neural network model was constructed based on the principal components. The results show that visibility in the foggy weathers not only has a good correlation to meteorological factors but also is influenced by air pollutants such as NO2, O3 and PM10; the model can accurately predict the visibility levels (heavy fog, dense fog, extremely dense fog), and has a good reference value to improve the ability of fine fog forecast.
Keywords: applied meteorology; fog; visibility level; principal component analysis; neural network
 
Title: Design and analysis of optical fiber temperature sensor radition sheild
Authors: ZHU Chaogui, LIU Qingquan, YANG Jie
PP: 1253-1261
Abstract: In order to improve the accuracy of atmospheric temperature measurement, a new optical fiber temperature sensor for surface meteorological observation is designed in this paper. To verify the design of the actual performance of the radiation shield in this paper, using the method of computational fluid dynamics (CFD) with the intensity of solar radiation and air velocity as impact factors, the amount of radiation heating of themometer screen and radiation sheild are designed in this paper for CFD simulation in the same environment. The simulation results show that compared to the traditional radiation shield, the optical fiber temperature sensor designed in this paper can reduce the errors caused by solar radiation greatly. Finally, a computational fluid dynamics method is implemented to analyze and calculate the temperature of optical fiber temperature sensor placement induced by radiation in optical fiber temperature sensor radition shield under various environmental conditions. Then, a correction equation of the temperature rise is obtained by surface fitting using a genetic algorithm. In order to verify the accuracy of the modified equation, the values of some characteristic points are calculated by using the correction equation and the values of the same points are calculated by using the CFD method. By contrast of correction value and simulation value, the conclusion can be drew that the radiant temperature correction equation has good correction effect.
Keywords: atmospheric sciences; simulation technology; temperature sensor; computational fluid dynamics; solar radiation
 
Title: Comparison of four ice velocity measurement software based on optical remote sensing images
Authors: KONG Fansi, QIAO Gang, WANG Weian
PP: 1240-1252
Abstract: Ice flow velocity is an important parameter of the Antarctica mass balance and many kinds of ice velocity measurement software are widely used in the world. In this paper, four kinds of commonly used ice velocity measurement software based on optical remote sensing images are selected to evaluate their performance, including Imcorr, CIAS, COSI-CORR and MicMac. The principles are first introduced, followed by the experiment on Landsat images. Results show that in our test region, COSI-CORR and MicMac have the best measurement accuracy, followed by Imcorr and MicMac; when it comes to the runtime, Imcorr performs best, followed by COSI-CORR and CIAS, and MicMac is the most time-consuming; as for the measurement region, MicMac covers the largest, then CIAS and Imcorr, and COSI-CORR has the minimum coverage.
Keywords: natural geography; measurement software comparison; Imcorr; CIAS; COSI-CORR; MicMac
 
Title: Study on the realization paths for Hebei province to undertake the transformation of tourism industry from Beijing and Tianjin maximally
Authors: CHU Qingzhong, XU Yangke, WU Aizhi, SUN Lu, WANG Lianjin, SHI Peibing, CHEN Xiaozhe
PP: 1234-1239
Abstract: In this paper, we discuss how to undertake the transfer of Beijing and Tianjin tourism industry in Hebei province. Hebei province surrounds Beijing and Tianjin, with the conditions in the industry to undertake Beijing-Tianjin richly endowed by nature tourism area transfer. Coordinated development has become a major national development strategy in the background of Beijing and Tianjin, Hebei province actively explore how best to undertake the transfer of Beijing and Tianjin tourism industry has a very important practical significance. Author in a wide range of access to information and full investigation on the basis, points out the Hebei province to undertake the transfer of Tianjin tourism industry has five major advantages of location, resources, industry, strategy, transportation and other and further put forward the Hebei province to maximize the undertake transfer of Tianjin tourism industry of six paths.
Keywords: geography; tourism management; Beijing-Tianjin-Hebei; industrial transformation; implementation path
 
Title: Detecting N2O production in biofilm from one-stage completely autotrophic nitrogen removal system by microelectrodes
Authors: WANG Xixi, FANG Fang, CHEN Youpeng
PP: 1226-1233
Abstract: We used chemical inhibitor to distinguish N2O production pathway in nitrogen removal process, and utilized microelectrodes to investigate the N2O production from one-stage completely autotrophic nitrogen removal system. The results show that dissolved oxygen (DO) is mainly consumed over the outer 400 μm of the biofilm, NH4+ and NO2-concentrations decrease considerably along the depth of the biofilm, NO3- concentration increases firstly and then decreases, and multiple nitrogen transformation pathways are active in the biofilm. The main sources of N2O production are ammonium-oxidizing bacteria (AOB) denitrification and heterotrophic denitrification. It is speculated that AOB denitrification is the most important pathway for N2O production from the biofilm.
Keywords: water pollution prevention engineering; one-stage completely autotrophic nitrogen removal; microelectrodes; nitrogen transformation; N2O
 
Title: Influences of extracellular polymers substances on the early marine steel corrosion
Authors: DONG Chenhua, DONG Yaohua, YIN Yansheng
PP: 1218-1225
Abstract: The extracellular polymeric substances (EPS) of Pseudomonas were extracted by cation exchange resin method in this paper. The content of EPS was determinated by using chemical method and Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The results showed that EPS consist of reduction of functional groups such as carbonyl, hydroxyl, carboxyl group. Electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) were applied in studying the effect of EPS on the corrosion behavior of DH32 steel. The results showed that the presence of EPS can affect the corrosion behavior of DH32 steel in seawater. The corrosion of DH32 steel was inhibited by EPS, and with the increase of EPS concentration, corrosion inhibiting is significantly enhanced. However, due to EPS bound metal ions, the electron transfer was accelerated and redox reaction was promoted, and the efficiency of corrosion inhibition decreased.
Keywords: basic subject of material science; seawater corrosion; electrochemistry; extracellular polymeric substances; marine steel
 
Title: Synthesis and mechanical properties of Si-doped CNTs
Authors: TONG Xiao, LI Da, LI Xiang
PP: 1212-1217
Abstract: We report the successfully synthesis of carbon nanotube (CNT) film by floating catalyst chemical vapor deposition in the presence of electron donor element Si. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and laser Raman spectrometer (Raman) were utilized to evaluate the effects of Si-doping on structure and mechanical property of carbon nanotube. Results indicated that the introduction of heteroatom into hexagonal carbon framework damaged the structure and increased the defect degrees of CNTs, therefore, some of CNTs collapsed under their own pressure. Due to the larger area contact and stronger interfacial adhesions induced by the collapse, the as-prepared Si-CNT film exhibit superior mechanical properties than raw CNT film.
Keywords: inorganic nonmetallic materials; carbon nanotube film; Si-doping; collapse; tensile strength
 
Title: Electrochemical performance of the new type of CuCo2O4 supercapacitor electrode material
Authors: LIAO Lijun, PAN Yishuang, PENG Xuan, ZOU Rujia, HU Junqing
PP: 1206-1211
Abstract: In this paper, the hedgehog like CuCo2O4 was synthesized on Ni foam using a simple hydrothermal method approach, followed by a post-annealing treatment. X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) were used to analyze the samples, and the electrochemical properties of CuCo2O4 electrodes were studied by cyclic voltammetry, constant current charge discharge and the long-term cyclic stability. The results show that the CuCo2O4 electrode material has good electrochemical energy storage properties. Most of all, at the current density of 3 mA/cm2 , the capacity can reach 0.907 F/cm2, and after 800 circles, a long term cyclic stability of 90.5% capacitance retention. The electrochemical energy storage of these results indicated that the prepared material is an ideal electrode material for energy storage device.
Keywords: inorganic nonmetallic materials; CuCo2O4; hedgehog like; electrochemical performance
 
Title: Synthesis of D-A copolymers based on quinoxaline and its application in organic solar cells
Authors: HE Baitian, CAI Wanqing, ZHANG Jie, HUANG Fei
PP: 1197-1205
Abstract: A series of narrow-band-gap donor-acceptor conjugated polymers, with quinoxaline derivatives as acceptor units and bithiophene as donor unit, were synthesized. It was found that solubility and device performace of the resultant copolymers were strongly affected by the alkyl chain and fluorine. The synthesized D-A narrow band gap conjugated polymers can be fabricated as active layers for solar cells. The best performance of polymer solar cell was achieved with inverted device structure of ITO/ZnO/Copolymer:PC71BM/MoO3/Ag, which showed an open circuit voltage of 0.55 V, a short-circuit current (Jsc) of 9.56 mA/cm2, and a fill factor of 62.5%, leading to a high power conversion efficiency of 3.31%.
Keywords: functional polymer materials; polymer solar cells; D-A copolymer; bulk heterojunction
 
Title: Study on the natural latex preservation with zinc sulfate
Authors: HOU Xue, ZHAO Fuchun, BAI Xiaoying, ZHANG Shengjun, LIAO Shuangquan
PP: 1189-1196
Abstract: Effective preservation of natural latex early plays a vital role for high quality rubber. Ammonia is often used for the preservation of the natural latex, but it may pollute air, corrode buildings, harm workers’ health and so on. In this paper, the effect of zinc sulfate on the preservation of natural rubber latex is studied by the mesurement of the volatile fatty acid, pH value of latex, Zeta potential, particle size and the number of colonies. The results show that zinc sulfate has a good preservation effect for nature rubber. The volatile fatty acids value is 0.093, pH value has not changed, Zeta potential is -34.1 of the natural latex with zinc sulfate as a preservative in the 16 h preservative period. In addition, aerobic bacterial count of fresh nature rubber with zinc sulfate as a preservative is less than that with ammonia as a preservative, showing that zinc sulfate has good antibacterial effect for nature rubber. The physical properties of the nature rubber are up to No. 5 standard rubber and the structure of the nature rubber has not changed.
Keywords: organic macromolecule materials; natural rubber latex; preservation without ammonia; zinc sulfate; stability
 
Title: Synthesis and photovoltaic performance of 9-methyl fluorine-based small molecules for solution-processed organic solar cells
Authors: HUANG Xuelong, LI Qingduan, ZHOU Cheng, LIU Shengjian, ZHANG Jie, HUANG Fei
PP: 1179-1188
Abstract: A series of linear acceptor-donor-acceptor (A-D-A) small-molecule organic solar cell materials OVFFBT, OVFBT and OVFPT, which were composed of 9-methylfluorine as donor and benzo[1,2,5]thiadiazole, 5-fluorobenzo[1,2,5]thiadiazole and [1,2,5]thiadiazolo[3,4-c]pyridine as acceptors, were designed and synthesized. We found that optical properties, electrochemical properties and device performances of the resulting materials were strongly influenced by the acceptor units. The photovoltaic properties based on OVFFBT, OVFBT and OVFPT as donors and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the acceptor were investigated with a conventional device structure of ITO/PEDOT:PSS/Active layer/Al. The device based on OVFFBT and PC61BM exhibited high open-circuit voltage approaching 1.0 V.
Keywords: organic macromolecule materials; 9-methyl flurine; organic small molecule; solution-processed; solar cells