bluuebunny/crossref_metadata_2025 huggingface dataset:
Sulfur Isotope Geochemistry of Sn–Polymetallic Depositsin Dafulou District of Guangxi Province, China
Authors: Cheng Yong Sheng
Published: February 2012

The Dachang tin-polymetallic ore deposit is one of the largest Sn ore deposit in the world. For a long time, the Danchi mineralization belt was studied from different perspective, i.e., the mineralization age, the ore source, the deposit model, etc. In fact, the contradistinction of the three mineralization belts has an important macroscopic significance for deepen the genetic mechanism of the Danchi mineralization belt. In the Changpo ore deposit of the west mineralization belt, besides three δ34S values (+4.794, +2.31, +2.6), the δ34S values belong to negative value, yet in the Lamo ore deposit of the middle mineralization belt, most of the δ34S values show positive besides two sulfur isotope sample (δ34S=－0.36, －1.6). But in the Dafulou ore deposit of the east mineralization belt, the δ34S values range from negative value to positive value. So there are only same ore resource partly for the Lamo ore deposit and the Changpo ore deposit. Overall, the ore source of the Dafulou ore deposit is more extensive than other ore deposit, and shares the same ore source with the other ore deposit.
Research on the Migration Characteristics of Organophosphorus in Clay
Authors: Li Hong Yan , Zhang Guang Xin , Song Ding Feng , Li Xu Qian
Published: February 2012

In order to study the migration characters of organophosphorus in clay, experiment was designed to simulate the process of organophosphor leakage permeating the aquitard, searching the migration characters of organophosphorus in clay with different pH. It is shown that the ability of migration of organophosphor leakage permeating the cohesive soil fall with increase of pH between7.5 and 9.5, and the extent of mineralization for organophosphor in clay rise with increase of pH.
Research on Attenuation Effects of Plasma to Electromagnetic Waves and Influences to the Spacecraft Communication
Authors: He Wu Sheng , Mao Gen Wang , Chen Mao Lin
Published: February 2012

Electromagnetic waves will be attenuation when through plasma because of absorption and refraction efferts. Active application of plasma attenuation effect has good application prospect, such as aircraft stealth. But at the same time, the attenuation effect oneself will also bring some problems. For exzample, as the power system of the spacecraft, electric thruster plasma jet is possiblly to cause some problem on the communication between spacecraft and ground stations [1] .
Strategy of Triangulating Surface of the Hollow Cylinder
Authors: Li Hong Liang , Lu Jin Gui , Xuan Zhao Xin , Zhang Jian De
Published: February 2012

This paper is involved in triangulating surface of the hollow cylinder. The strategy is proposed for generating surface triangulation elements for the hollow cylinder at first. The strategy of adjusting the surface triangulation elements which are adjacent to the crossing cures in the hollow cylinder, is discussed. The computer implementation on the strategy proposed in this paper is given and the numerical example is performed. The example of the hollow cylinder verifies the correctness of the strategy proposed in this paper.
The Viscoelastic-Plastic Displacement Back Analysis of Rock Mass with Non-Stationary Parameters
Authors: Liu Quan Sheng , Li Jin Lan
Published: February 2012

The FEM positive analysis is made using H-K non-stationary creep constitutive model in this paper, the finite element program for non-stationary viscoelastic-plastic displacement back analysis is compiled combining the non-stationary viscoelastic-plastic program with the complex shape optimization method, and the displacement back analysis of soft tunnel engineering is conducted. The result indicates that the viscous aging characteristics of rock mass can be reflected objectively if rock mass is regarded as non-stationary viscoelastic-plastic model, and the plastic zone development of surrounding rock can be predicted considering the plastic flow of rock mass and regarding the back analysis results as the calculation parameters.
Samarium-Neodymium and Strontium Systematics Applied to Calcite Veins in Dabashan Thrust and Fold Belt in China: Dating and Tracing of the Fluid
Authors: Huang De Zhi , Wang Xian Ying , Li Guo Ming , Liu Zhen , Peng Ze Hua , Huang Shi Qi , Dong Shu Wen
Published: February 2012

Dabashan Thrust and Fold Belt is situated in the transfer zone between Qinling Orogen and Sichuan Basin, where multi-generation calcite veins were developed. Two kinds of veins, bedding-parallel and fracture-filled veins, were collected for analyses of rare-earth elements (REE), samarium-neodymium and strontium isotopes. The total REE contents of the calcites from the bedding-parallel vein are much higher than those from fracture-filled veins and are rich in light REE (LREE). The chondrite-normalized patterns of REE curves of the calcites from fracture-filled veins are flatten. The 87Sr/86Sr and 143Nd/144Nd ratios of calcites from bedding-parallel vein are from 0.71068 to 0.71115 and from 0.51192 to 0.512058, respectively. On the 147Sm/143Nd vs 143Nd/144Nd diagram, the six samples from the bedding-parallel vein give a Sm-Nd isochron age of 357±230 Ma (2σ)( MSWD = 24) with an initial 143Nd/144Nd ratio of 0.51168±0.00019. However, the plots of the four samples from fracture-filled veins are rather scatter either on 147Sm/143Nd vs 143Nd/144Nd or on 87Sr/86Sr vs 143Nd/144Nd diagram. The fluids, from which the two kinds of veins precipitated, are different in origin and flowing.
Extraction of Gravity Anomalies Associated with Gold Mineralization: A Comparison of Singular Value Decomposition and Bi-Dimensional Empirical Mode Decomposition
Authors: Chen Yong Qing , Zhao Bin Bin
Published: February 2012

Two methods of both the singular value decomposition (SVD) and the Bi-dimensional empirical mode decomposition (BEMD) were applied in extraction of gravity anomalies associated with gold mineralization in Tongshi gold field, respectively in this paper. Conclusions drawn by the comparison study are as follows: (a) The ore-controlling factor in the Tongshi gold field illustrated in the images obtained from the original gravity data by the two methods is the same that the Tongshi intrusions with a negative circular gravity anomaly and the ring contact metasomatic mineralization zone around the Tongshi intrusions with the positive gravity anomaly. (b) The two methods reveal the same spatial relationship between the ore-controlling factor and various gold mineralizations that the skarn and porphyry types of gold deposits are located within the complex pluton and the Carlin and Crypto-breccia types of gold deposits located within the contact metasomatic mineralization zone. (c) The image produced by BEMD not only reflects the structural features of the ore-controlling factor (Tongshi complex pluton), but also does the distributions of the other geological units in the Tongshi gold field such as the Mesozoic volcanic sedimentary basin in NW orientation with obvious negative gravity anomaly and the conceal metamorphic base swell in NW orientation with the positive gravity anomaly located between the Tongshi intrusions and the Mesozoic volcanic sedimentary basin. The image produced by SVD might depict in more detail the inner structure of the Tongshi intrusions and the ring contact metasomatic zone than that produced by BEMD. The higher gravity anomaly areas in island shape within the ring contact metasomatic zone may be caused by the skarn bodies with iron-copper-gold mineralization. (d) Under the constraints of the ore-forming geological setting, the results obtained from the original gravity data by combination of the two methods can depict the relationships between the ore-controlling factors and the gold mineralizations more exactly than the alternative methods.
Mechanism and Calculation Research on Excavation Deformation of High Layered Dip Rocky Slope
Authors: He Hai Ying
Published: February 2012

Based on rock Mechanical theory under unloading, according to the analysis of rock mechanics state of pre and post excavation of the layered dip rocky slope, it was found that excavation unloading cause deterioration of rock constitutive relation and structure plane’s mechanical parameters, deformation mechanism of high layered dip rocky slope was analyses when rock is at unloading condition in this study. Its deformation consists of the two parts which are rock mass unloading rock mass springback displacement and bedding-slip displacement along the rock mass discontinuity, and deduced the calculating formula of slope displacement. Research results with great guide significance and practical engineering value to similar engineering construction afterward.
Study and Engineering Practice on Cracks Control Measures for Concrete Face Slab of High CFRD
Authors: Luo Dan , Luo Li Zhe
Published: February 2012

Being the face slabs of high concrete faced rockfill dams (CFRD) are under complex stress state, the slabs are relative vulnerable. And crack is easy to form on slab, which can influence durability and integrity, then weaken impermeable ability and safety of dam. The factors that contribute to the structural cracks, non-structural cracks and extruding cracks of concrete face-slab are analyzed in detail. The result shows that the structural crack is mainly due to differential settlement, the extruding crack in riverbed position is mainly caused by rockfill body over-settlement of dam beyond 150m high and the non-structural crack is mainly caused by temperature shrinkage and air shrinkage. Therefore, crack control of CFRD face slab should be regulated by the three means coming from structural design, construction control and concrete material. It is proved by the practices in Shuibuya CFRD that face slab cracks on CFRD beyond 200m high can be reduced effectually by the present technique means.
Study on Effect of the Modified Hollow Microspheres on the Foam Ability and Stability of Fire Fighting Foam
Authors: Tang Bao Hua
Published: February 2012

In this paper, fluoroalkylsilane (F3C-(CF2)5-(CH2)2-Si (OC2H5)3, F-8261) was successfully used as surface modifier to prepare oleophobic hollow microspheres. Three-phase foam was directly fabricated by oleophobic hollow microspheres. The result shows that outstanding improvement in the stability and anti-burning properties of three-phase foam on oil were achieved through the oleophobic modification. The optimum reaction conditions were 12% of fire fighting protein，the addition of 50% of hollow microsphere and0.5% F-8261.
The Function of Sba-15 over Ni/Mo2C Catalysts for Carbon Dioxide Reforming of Methane
Authors: Huang Jian , Huang T. , Chunluan H. , Huang Wei , Ma Ren Xiong
Published: February 2012

A mesoporous silica (SBA-15) was used to prepare the Ni/Mo2C catalysts in order to study the influence of the support on the catalytic performance. The catalysts were characterized by-N2adsorption, X-ray diffraction, FT-IR absorption, CO2-TPD and SEM analysis. The catalytic properties was tested at 800°C, atmospheric pressure, GHSV of 9000 ml3h-1g-1and a CH4/CO2molar ratio of 1. These results suggest that catalytic activity, which is directly related to the incorporation of nickel and molybdenum carbide to the mesoporous silica.
Preparation and Properties of Zno/Vermiculite Composite Particles
Authors: Jin Ling , Dai Bin
Published: February 2012

ZnO/vermiculite as the novel photocatalysts were prepared by two approachs: one is mixtures of ZnO and different acid treated vermiculite, and another is sol-gel method. The acid activated vermiculite as a new promising catalyst support and adsorbent has a large capacity of absorption, high surface area and thermal stability. The activity of catalyst has been interrelated to support and ZnO. Based on the important effect of support on ZnO/vermiculite photocatalysts, treatment of vermiculite by nitric acid of different concentration was studied by evaluated in the photocatalytic decomposition of MB with resulting photocatalysts. BET surface area measurement and X-ray diffraction (XRD) analysis were used to characteristic of ZnO particle in acid treated vermiculite structure and the phase structure and crystallization index of ZnO in the modified vermiculite mineral. Results showed the ZnO-vermiculite combination possessing higher photocatalytic activity due to the synergistic effect when compared to the commercial ZnO.
The Energy-Saving Optimization of the Organic Heat Transfer Material Heater
Authors: Gu Wei Li , Liu Jian Xiang
Published: February 2012

this paper studies the typical irreversible processes such as combustion and heat transfer with temperature difference based on the theory of thermodynamics, analyzes the influencing factors on exergy loss in irreversible processes, on the basis of this analysis, proposes the energy-saving optimization measures on design and operation management of the organic heat transfer material heater, and specially points out that in the design process, objective function can be constructed with the exergy loss as evaluation index to determine the outlet flue gas temperature of furnace and the flue gas temperature, and provides theoretical basis for the determination of design parameters.
Effects of Fuel Octane Number on Homogeneous Charge Compression Ignition (HCCI) Combustion with Rapid Compression Machine
Authors: Wang You Kun , Cheng Peng , Wang Yun Kai , Li Hua , Guo Ying Nan
Published: February 2012

The effects of fuel octane number (RON) on homogeneous charge compression ignition (HCCI) combustion were studied under different combustion boundary conditions on a rapid compression machine. The results show that the maximum pressure raise rate and maximum combustion temperature decreased as the RON increased while the start of combustion is delayed and the combustion duration is shortened at the same time.
Effects of Difference Leading Edge Shapes on Numerical Simulation of Centrifugal Compressor
Authors: Sun Tao , Wang Xiao Fang , Wang Yi
Published: February 2012

In order to research the effects of leading edge shapes on the strength of centrifugal compressor compeller, the shrouded impellers of a large centrifugal compressor were introduced for finite element analysis. In the present study, the geometric models of 3 shrouded impellers were established in Solidworks 2007, and then numerical simulations were carried out using ANSYS. Through visualization of the computational result of the impellers with a square leading edge, a semi-circular leading edge and a elliptical leading edge, it was clarified by comparison that different leading edge shapes had significant influences on the compressor strength. According to the charts of the Von Mises stress versus leading edge shapes, it was indicated that approximately a 27% drop and a 32% drop in maximum Von Mises stress value occurred in the shrouded impellers of a semi-circular leading edge and a elliptical leading edge compared to a square leading edge respectively. That is, the semi-circular leading edge or elliptical leading edge employed in a centrifugal compressor would dramatically improve structural strength. This paper aims to provide the reference significance the structural optimization and reliability improvement of a large flow centrifugal compressor.
Vibration Characteristics Analysis of Tubing String in Three-High Gas Well
Authors: Yang Min , Ma Yu , Li Shi Gui
Published: February 2012

Three-high gas well is High-production gas well, High-temperature gas well and High-sulfur gas well.In the mining process of three-high gas wells, due to the impact of the role of the fluid and the tubing string fluctuations lead to severe vibration, the role could easily lead to severe vibration column damage. Based on the high gas flow during the mining shaft and column structural characteristics, taking into account the weight of the tubing string, the packer constraints impact characteristics of steel tubing, pre-stressing, the fluid pressure force on the tubing string's vibration characteristics. Established a tubing string vibration equation, and the establishment of the corresponding mass matrix obtained, the stiffness matrix and damping matrix. Lanczos algorithm with inherent characteristics of the pipeline parameters. The modal superposition method to analyze vibration characteristics of the tubing string, to ensure that the calculation speed in the case met the approximate solution of engineering precision, For the three-high gas wells safe, efficient production of effective technical support.
Diffusion Combustion Characteristics of H2/Air in the Micro Porous Media Combustor
Authors: Cao H.L. , Zhao J.N. , Zhang K. , Wang D.B. , Wei X.L.
Published: February 2012

In order to improve thermal to-electric energy conversion efficiency of the micro gas turbine power generation system, a novel micro porous media combustor is designed and experimental investigation on the H2/air diffusion combustion is performed to obtain its combustion characteristics. High efficiency diffusion combustion of H2/air can be stabilized in the very wide operating range, especially at higher excess air ratio. Exhaust gas temperature is markedly improved and meanwhile heat loss ratio is evidently decreased. Moreover, in the certain operating ranges, the greater the combustion thermal power and excess air ratio, the smaller heat loss of the micro combustor will be. The micro porous media combustor should be a preferred micro combustor for developing the micro gas turbine power generation system.
Purification and Fractionation of Natural Petroleum Sulfonates by Liquid-Liquid & Soxhlet Extraction
Authors: Niu Rui Xia , Li Bo Lin , Long Biao
Published: February 2012

Natural petroleum sulfonates (PS) was separated, purified and divided into several fractions by a new method liquid-liquid & soxhlet extraction. The effects of heating time, volume ratio of extractants (isopropanol aqueous solution-50/50 (by volume) : n-pentane), gradient solvent types, extracting time & times on the separation efficiency are discussed, respectively. And the extracted mineral oil was anlalyzed by IR spectra, the average equivalent weight of each extracted PS fraction was measured by ESI-MS. The experimental results show that the volatiles in natural plant-manufactured PS can evaporate thoroughly in 3.5h at 130°C, and when the volume ratio of stated extractants is 3:1, after several times extraction & anti-extraction, the extracted mineral oil is PS-free, and the purified PS is successfully separated from inorganic salt, meanwhile the purified PS was divided into four fractions, whose average equivalent weight are (toluene extract) 595.03, (dichloromethane extract) 486.00, (isopropanol extract) 474.85 and (alcohol extract) 384.5g/mol, respectively. The proposed method is superior to the traditional liquid-liquid extraction for simplified steps and bifunction with PS purifying & fraction dividing, can separate efficiently industrial PS and other similar mixtures.
Experimental Study of Purifying Precipitated Silica Produced from Yellow Phosphorus Slag
Authors: Li Guo Bing , Lin Hai , Ma Yan Li , Su Yi
Published: February 2012

When precipitated silica was prepared from yellow phosphorus slag by the phosphoric acid leaching, the Fe content can not meet the quality requirements of the product. This article indicates the method of purifying precipitated silica with nitric acid solution, which may decrease the Fe content to about 0.02%. The purification optimum technical conditions are: the nitric acid concentration 8%, reaction time 2.0 hours, reaction temperature 343.15K, fluid solid ratio 4:1, stirring speed 300 rpm.
Feasible Study of Fire-Resisting Wood Material in Habitability Design of Large Surface Vessels
Authors: Zhang Wen Bo , Wang Feng Hu , Liu Bing
Published: February 2012

Wood because of its unique texture, color, smell has a good affinity with the people is to improve the living conditions of very rational ship materials, Can the wood material applied on a large surface ships, the key is fire prevention. This will be the leading domestic and foreign varieties of fire retardant wood elaborated, And proposed development and application of wood composite materials, to improve the habitability of large surface ship design and improve work efficiency and thus improve the ship crew the importance of fighting; The flame-retardant composite sheet material of biomass improved formulations, which can effectively achieve the fire retardant requirements of large surface ships, ultimately achieving the purpose of the application of the ship.
An Amphiphilic Acrylic Copolymer/Montmorillonite Nanocomposite
Authors: Gao Ming , Zhou Dong Liang , Hu Xiao , Zhu Pu Xin
Published: February 2012

A bi-component copolymer/layered silicate nanocomposite was synthesized by way of a two-stage radical copolymerization of emulsion intercalation and solution intercalation, using acrylates, methacrylic acid and acrylamide as monomers. The water-based product was designed with a structure of a hydrophobic copolymer dispersed in an aqueous copolymer solution to meet needs of warp sizing agents on adhesiveness to hydrophobic and/or hydrophilic fibers, appropriate glass transition temperature, as well as water-solubility. XRD patterns for the product films showed an exfoliated structure of montmorillonite (MMT) in the part of soluble acrylic copolymer as the MMT content equal to or less than 7%, while in the part of emulsion copolymer alone or the product as a whole, the MMT showed an intercalated structure. Determination of DSC indicated that chemical bondings occured between the hydrophobic and hydrophilic components, which guaranteed storage stability of the system and water-solubility of the sizing film, and that there were threeTgs corresponding to the emulsion copolymer, solution copolymer and the interfacial copolymer between the two phases. All theTgs increased with increasing content of the MMT in the composites.
Study on Modified Starch by Glutaraldehyde and its Properties and Application
Authors: Lv Sheng Hua , Rui Gong , Hu Jing
Published: February 2012

The modified starch was prepared by degradation starch with glutaraldehyde. The process conditions of degradation and modification starch were investigation. The result shows that the degradation starch was obtained through 22.5 g cornstarch and 1g ammonium persulfate (APS) in 127.5 g water at 95°C for 1h, and the modified starch was obtained by aldolization reaction of degradation starch and 4 mol/AGU glutaraldehyde at 85°C for 5h. The modified starch can be used as leather tannage. The shrink temperature (Ts) of tanned leather can be increase from 41.6 °C to 85.2°C. It may replace chrome tannage and decrease the pollution produced in chrome tanning processing. Meanwhile, the chemistry structure of modified starch was characterized by FTIR, 1H-NMR, 13C-NMR
Energy-Saving Characteristics of Benzene-Toluene Mixtures in Heat Pump Distillation Column
Authors: Tong Zheng Ming , Li Chao , Lu Jia Lei , Zhu Kai
Published: February 2012

China is a big industrial energy consuming country. The largest proportion of energy consuming is the operations of separation in chemical industry, and the energy consumption of the distillation is the highest in separation. Therefore, it is very important to research energy-saving issues of the process of distillation in today's circumstances of the energy shortage. This article describes the model of heat pump distillation column,and its characteristics, uses static simulation programs to simulate operating conditions in the atmospheric pressure for the benzene-toluene material system, and studys effects of the different feed states on the energy-saving of heat pump distillation column. The results will be compared with the conventional distillation column, and it was showed that for benzene-toluene system, the heat pump distillation column is more remarkable than the conventional distillation column in energy savings, and its energy saving rate can reach 46%.
Brilliant Blue-Functionalized Reduced Graphene Oxide with Excellent Stability and Solubility in Water
Authors: Yu Ai Li , Lin Min Song , Xie Agui , Cai Xiang , Tan Shao Zao , Zhang Xiu Ju , Lin Zhi Dan
Published: February 2012

π stacking and water-solubility of brilliant blue (BB) are expected to facilitate the hydrazine mediated reduction of graphene oxide (GO) in aqueous environment. Our newly-obtained BB-functionalized reduced graphene oxide (BB-rGO) exhibited excellent solubility and stability in water. The properties of BB-rGO were investigated. The results showed that the BB molecules stacked non-covalently onto the basal plane of rGO by strong π-π interactions while the sulfo groups of BB prevented the rGO from aggregation by electrostatic and steric repulsions, therefore leading to the solubility and stability of BB-rGO in aqueous dispersion.
Use Differential Pulse Voltammetry for Determining the 2,6-Ditertbutyl-4-Methylphenol in Jet Fuels
Authors: Shi Yong Gang , Su Bin , Gong Hai Feng , Xue Yan
Published: February 2012

A new method for determination of antioxidants in jet fuels, which is based on the differential pulse voltammetric characteristics of the antioxidant 2,6-ditertbutyl-4-methylphenol in the solution of saturated KOH anhydrous ethyl alcohols, is established. The experimental results have shown that there is a linear relationship between the content of 2,6-ditertbutyl-4-Methyl-phenol in the jet fuel and the differential pulse voltammetry response in the electrolytic solution. It has also been shown that the antioxidant contents can be reliably and simply determined with the help of the standard addition method. The largest relative error of the determination is 6.70 %, the biggest confidence for 5 samples is 1.95 mg/L (n=5, 95% confidence level).
Aging Behavior of Polyaspartic Polyurea under Salt-Fog Exposure Studied by Electrochemical Impedance Spectroscopy
Authors: Huang Wei Bo , Zhang Jing , Li Xin Mao , Lu Ping
Published: February 2012

- Electrochemical impedance spectroscopy (EIS) was used to study the thickness and curing temperature influence on the aging behavior of polyaspartic ester (PAE) polyurea under salt fog exposure in this paper. The result has demonstrated that coating thickness and curing temperature had great influence on aging behavior of the PAE-t-HDI prepolymer-D2000H65 aliphatic polyurea (T3). The low frequency impedance after 1day exposure increased from 5.31×1010Ω·cm to 7.96×1010Ω while coating thickness was increased from 40μm to 200μm, and the low frequency impedance of 200μm coating was 7.42×1010Ω·cm2 high after 200 days exposure. The low frequency impedance after 1day and 200 days exposure increased by 0.83×1010 Ω·cm2 and 0.39×109Ω·cm2 respectively, while curing temperature were increased from 60°C to 80°C. Suggestions have been made, namely that increase the coating thickness and curing temperature can improve low frequency impedance of PAE polyurea, as a result, improve the protective properties of the coatings.
Investigation into Hardness and Young’s Modulus of Thin Films of Lead Germanium Telluride
Authors: Li Bin , Xie Ping , Zhang Su Ying , Liu Ding Quan
Published: February 2012

A mechanically robust infrared high-index coating material is essential to the infrared interference coatings. Lead germanium telluride (Pb1-xGexTe) is a pseudo-binary alloy of IV-VI narrow gap semiconductors of PbTe and GeTe. In our investigation, the hardness and Young’s modulus of thin films of Pb1-xGexTe, which were deposited on silicon substrates using electron beam evaporation, were identified by means of nanoindentation measurement. It is demonstrated that layers of Pb1-xGexTe have greater hardness and Young’s modulus compared with those of PbTe. These mechanical behaviors of layers can be linked to a ferroelectric phase transition from a cubic paraelectric phase to a rhombohedral, ferroelectric phase. Moreover, the strength loss in the layers of Pb1-xGexTe can be also explained in light of strong localized elastic-strain fields in concentrated solid solutions.
Study on Thermodynamics of MgO Based Desulphurizer
Authors: Ren Xiao Dong , Zhang Ting An , Dou Zhi He , Liu Yan , Lv Guo Zhi , He Ji Cheng
Published: February 2012

For the lacks of magnesium-based desulfurizer in iron and steel industry, this paper investigated thermodynamics calculation of a new desulfurizer, MgO based desulphurizer. The results indicate that the beginning reaction temperature of light-burned dolomite and Al is 1314°C, the beginning reaction temperature of light-burned dolomite and Si is 1565°C, the beginning reaction temperature of MgO and Al is 1475°C, and the beginning reaction temperature of MgO and C is 1846°C. The reaction temperature between MgO and C is too high, so the carbon-thermal reduction can’t occur easier. When the hot iron temperature is 1400°C and the addition of alumnium and iron oxide is 12.77%, the reaction between MgO and C will be induced.
Tunable Morphologies of Co2+-Doped Zno/Znal2O4 Composite Films Derived from Co2+-Substituted Layered Double Hydroxide Single Source Precursor
Authors: Yin Rui , Yang Lan , Xu Sai Long
Published: February 2012

Co2+-doped ZnO/ZnAl2O4 composite films have been prepared by facile calcination of a single-source CoIIZnIIAlIII-layered double hydroxide (CoIIZnIIAlIII-LDH) precursor. The preparation was performed initially by cast aqueous precursor slurry on quartz glass substrate and subsequent transformation to a network-like film via calcination. The surface morphology and composition of the resulting films were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and XPS analyses. The results clearly indicated that the as-deposited film is composed of Co2+-doped ZnO and ZnAl2O4, and also large ZnO single crystals are homogeneously incorporated into small ZnAl2O4 particle matrix. The influence of Co2+-doping concentration on microstructure and also on optical properties of the composite films was also investigated.
Effect of Siderite on Reverse Flotation of Dong Anshan Iron Ore Containing Carbonates
Authors: Li Li Xia , Yin Wan Zhong , Feng Dan , Zhang Bin
Published: February 2012

The content of carbonate minerals in Dong Anshan iron ore was increasing in recent years, which deteriorated reverse flotation indices or even resulted in unclear separation between concentrate and tailing. In dodecylamine and sodium oleate systems, reverse flotation tests were undertaken with artificial mixed minerals of martite, quartz and siderite. Based on mineral flotation tests, the effect mechanism of siderite on reverse flotation were investigated in terms of SEM and EDS. Results showed that siderite was weakly depressed by starch, and the adsorption of siderite on hematite and quartz was the main cause for reverse flotation difficulties. In reverse flotation in dodecylamine system, the adverse effect of siderite on reverse flotation could be reduced when the amount of starch increased, and iron minerals and quartz were separated effectively. Therefore, the reverse flotation in dodecylamine system could be considered to realize separating effectively iron minerals and quartz of Donganshan iron ore containing carbonates, but which had high requirements on pH. Other methods were siderite being separated prior to reverse flotation or inventing flotation agents capable of effectively activating or depressing siderite.
The Effect of Na-Ion on the Growth and Hydrogen Generation of Hydrogen-Producing Bacteria Yuan-3
Authors: Zhang Lu Si , Ding Jie , Guo Wan Qian , Gao Lei , Ren Nan Qi , Zheng Guo Xiang
Published: February 2012

Hydrogen-producing zymogenous bacteria YUAN-3 (Ethanoligenens harbinense) is used as the study object, on which the intermittent hydrogen production test is applied to examine the influence of Na-ion concentration on the growth and gas generation of YUAN-3. Research results show that when Na ion concentration is 1.5g/L, cell concentration reaches the maximum level 0.892g/L; when Na-ion concentration is maintained at 2.0~3.0g/L, culture medium is applicable for hydrogen generation of YUAN-3.
Role of the Cathode in a Novel Photo-Electro-Chemical Catalytic Reactor
Authors: Song Lin , Zhang Xin , Zeng Xiao Long , Li Ming Yu
Published: February 2012

A novel photo-electro-chemical catalytic reactor with single/double-tank was designed. TiO2/Ti thin film electrode was used as photo-anodes, graphite as cathode and a saturated calomel electrode (SCE) as the reference electrode in the reactor. The efficiency of photo-electro-chemical catalysis was enhanced because the target pollutant was degraded not only titanium dioxide electrode in anodic tank, but also hydrogen peroxide through reducing dissolved oxygen with graphite electrode in catholyte. Malachite green (MG) and crystal violet (CV) were degradated effectively in these two reactors. The degradation efficiency of the double-tank reactor is superior to that of single-tank reactor and its apparent reaction rate constant is twice or more of than that of the single-tank reactor, which was result from the higher concentration of H2O2 in the double-tank reactor. In the single-tank reactor, H2O2 generated during cathodal reaction diffused to the anode and was consumed, while it could be prevented in the double-tank reactor. Under the conditions of cathodic potential Ec at-0.6V, initial solution pH at 3.0 and initial solution concentration 30 mg·L-1, the catalytic degradation of MG and CV were both pseudo-first order reactions.
Desulphurization of High Sulfur Coal by Mild Pyrolysis Combination with Magnetic Separation
Authors: Liu Quan Run , Xia Hao , Huang Guang Xu , Zhang Chuan Xiang , Ma Ming Jie , Wan Can
Published: February 2012

In this work, a new desulfurization process of high sulfur coal was designed and examined. The novel process involved pyrolysis of high sulfur coal at low temperature and then a dry magnetic separation. For testing the cleaning coal process, a Chinese high sulfur coal, Baisu coal was pyrolyzed in a fixed bed reactor from 400 to 700°C for 30min, and then separated by a dry magnetic separator. The results showed that under optimum conditions, a remarkable reduction of sulfur content in coal was achieved, and more importantly, almost all pyrite sulfur in coal was removed.
A Successive Iterative Optimal Pre-Coding Algorithm for Downlink Multi-User MIMO System
Authors: Gao Xian Kun , Qu Jian Hua , Yao Chuan An , Yu Yong Chang
Published: February 2012

Spatial multiplexing in the multi-user MIMO downlink allows each user in the system to receive multiple data subchannels simultaneously using the same time and spectral resources. In this paper, a successive iterative optimal algorithm based on signal-to-leakage-and-noise-ratio (SLNR) maximization algorithm is proposed, which make use of the unused subspace of some known users to improve the space gain of the other users and has no strict constraint on transmit and receive antennas numbers. According to the simulation results, the proposed algorithm outperforms the original SLNR algorithm, and has a considerable improvement in the system performance.
Preparation of N-Ce Co-Doped TiO2 Nanopaticles and their Photocatalytic Performance under Visible Light
Authors: Li Gui Hua , Wang An Feng
Published: February 2012

In this present work, N-Ce co-doped TiO2 nanopaticles were prepared via sol-gel process and characterized by TG - DTA and XRD. Their performance of photocatalytic degradation of methylene blue under visible light were investigated. N-Ce co-doped TiO2 appeared to be somewhat more efficient than the starting TiO2. The effects of catalyst compsition, catalyst amount, reaction temperature and solution pH on their photocatalytic activity towards methylene blue were studied and discussed. Experiment results depicted that activeness of catalyst N0.4Ce0.06/TiO2 was highest. Using this catalyst, when the catalyst amount was 0.3 g/L，the reaction temperature was 40 °C and pH of the solution was 9.0 the degradation rate of mehylene blue in 4h could reach 94.00%.
Algorithm of Fundamental Equivalent Susceptance of TCR Type SVC
Authors: Meng Qing Bo , Zhang Gui Xiang
Published: February 2012

The paper expounds the topology of TCR type SVC and proposes the controller’s implementation. Based on instantaneous reactive power theory, the paper ascertains the overall algorithm on SVC reactive power compensation. It can be refined to three steps: the extraction of active component and reactive component of fundamental, the modeling of compensation susceptances required and the four components of fundamental, and the establishing relationship of the fundamental equivalent susceptance of TCR and the triggering angle.The control performance of the algorithm is valued on accuracy and real-time.
Research on the Bearing Capacity of Unsupported Random Launching Site
Authors: Cheng Hong Jie , Zhao Yuan , Li Bin Mao , Zhan Jin Chun
Published: February 2012

Based on the uncertainty of engineering properties of unsupported launching site, fast assessment of preselective site must be done before missile launching, to provide decision for selecting launching position reasonably, and ensure launching missile safely and reliably. Mostly, the launching site is an elastic-plastic structure, the deformation and destruction of launching site is nearly related to the stress and developing process of strain, the support load of the site must be computed before using. In this paper, the bearing load of launching site is analyzed in missile erecting process with the hypothesis that the launching vehicle is bilateral symmetry object. Jack reaction force in erecting process is calculated while the influence of wind load is considered, which provides load criterion for building evaluation model of launching site. The running curve of jack reaction force related to erecting angle is yielded through using pressure data acquisition system. The amplitude and variation trend of jacks reaction force are in well match with theoretical calculation results by analyzing the running curves, and the rationality of result is verified by this way. The research conclusions can offer references for selecting and judging intensity of missile launching site when unsupported random launching way is applied.
Improve the Dyeing Property of Cotton Fabric via Corona Discharge
Authors: Ma Pi Bo
Published: February 2012

In this study, corona discharge treatment is applied to cotton fabric at various discharge voltages and time. The dye uptake of treated fabric was increased when the applied voltage and treating time increased. Its effects on surface modification of cotton fabric and its application in finishing are investigated with a range of analytical methods. The results suggest that corona discharge can be successfully applied the finishing of cotton fabric, especially in the green processing of dyeing.
The Design of Decoupling Control System for Air-Cushioned Head Box of Paper Machine Based on Siemens S7-PLC300
Authors: Meng Yan Jing , Zhou Bin , Liu Yuan Yuan
Published: February 2012

Small motions will result in heavy influence to the production in high-speed paper machine, therefore, decoupling control is necessary. This passage Puts forward the opposite angles strategies to solve the function of decoupling aiming at solving the difficulty that occurs in practice, like the characteristic of hard-coupling and non-linear. According to the mathematics model of the flow box, decoupling the quantity of the two couplings in the processes. Meanwhile, Introduces the SIEMENS S7-300 PLC and the DCS system that is realized by the it.
A Low Power PFD and Dual Mode CP with Small Current Mismatch for PLL Application
Authors: Yu Cao , Kim Min Su , Kim Hyung Chul , Yang Youn Goo
Published: February 2012

A high speed Phase-Frequency Detector (PFD) and Charge Pump (CP) are implemented using 0.13µm CMOS process with 1.2 V supply. The PFD is implemented with TSPC (True Single-Phase Clock) and positive edge triggered D flip-flop. Its polarity can be changed by setting the port. The dead zone problem is solved using an additional reset time. A single charge pump is implemented with two compensators. Dual mode CP design makes the charge pump much more flexible in applications. The current mismatch for the two modes is below 4.9 % within the voltage range of from 0.2 to 1.0 V.
Creep Age-Forming Experiment and Springback Prediction for AA2524
Authors: Zhan Li Hua , Tan Si Ge , Huang Ming Hui , Niu Jie
Published: February 2012

Creep age-forming (CAF) technology is a new forming method, which combined age hardening and creep forming processes into one. It is mainly used to manufacture wing panels. In this paper, a set of experimental device of creep age forming is developed and the influence of process parameters on the springback of artificially aged 2524 aluminium alloys (AA2524) are investigated. The law of the comprehensive effect of aging time, aging temperature, elastic pre-deformation radius and work-piece thickness, on creep aging springback and mechanical properties of AA2524 is obtained. Based on multiple regression analysis, springback prediction model of process parameters is established and further proven experiments have then been carried out. The result shows that the maximum springback deviation between the experimental results and the prediction ones is within 9.5%. The accuracy of springback prediction model is validated, which provides a theoretical basis for process parameter optimization and springback prediction of CAF.
On Process of Local Higher Education Information in China
Authors: Bi Ting Yan
Published: February 2012

China's information technology has undergone 30 years of development just like other developing countries. Though the information technology of Chinese education, especially higher education has just gone through 10 years of development, it has made remarkable achievements in infrastructure, key technologies, information technology, and standards construction. However, compared with western developed countries and the development needs of higher education, there is a wide gap in the level of information in local higher education in China. Conscientiously summing up results, revealing problems and learning from experiences of developed countries will be conducive to accelerate the process of education information in China's local colleges.
Online Fault Prediction for EPB Shield Tunneling Based on Neural Network
Authors: Shi Bu Hai , Li Wei Qing
Published: February 2012

For the complex earth conditions and uncertain factors, the earth pressure balance (EPB) shield tunneling is a complicated and high-risk process. There would cause some faults, such as earth caking, soil occluding in the capsule, water spewing, surface settlement. To avoid them, this paper applies artificial neural network (ANN) to predict the common shielding faults. The neural network is trained by several samples about the tunnel boring machine’s (TBM) parameters, and then it will have self-learning to identify the fault. With the parallel computing ability, the network could detect and predict abnormal behaviors online. This paper includes three parts, firstly, the introduction of EPB, and four usual blockings; and then the principle of BP neural network is present, for the defect of BP algorithm, two kinds of improved BP algorithms are applied in the network; finally, an simulation is given to illustrate the prediction.
Multi-Channel ECG Signals Compression Algorithm Using Simultaneous Orthogonal Matching Pursuit
Authors: Li Yong Ting , Chen Xiao Yan , Liu Yue Wen
Published: February 2012

Sparse decompression is a new theory for signal processing, having the advantage in that the base (dictionary) used in this theory is over-complete, and can reflect the nature of signa1. So the sparse decompression of signal can get sparse representation, which is very important in data compression. In this paper, a novel ECG compression method for multi-channel ECG signals was introduced based on the Simultaneous Orthogonal Matching Pursuit (S-OMP). The proposed method decomposes multi-channel ECG signals simultaneously into different linear expansions of the same atoms that are selected from a redundant dictionary, which is constructed by Hermite fuctions and Gobar functions in order to the best match the characteristic of the ECG waveform. Compression performance has been tested using a subset of multi-channel ECG records from the St.-Petersburg Institute of Cardiological Technics database, the results demonstrate that much less atoms are selected to present signals and the compression ratio of Multi-channel ECG can achieve better performance in comparison to Simultaneous Matching Pursuit (SMP).
An Identifier-to-Locator Mapping Buffer Management Algorithm Based on Aimed Pushing and Pre-Fetching Method
Authors: Zhang Jian Wei , Zhang Bao Wei , Liu Si , Li Zhao Yang
Published: February 2012

This paper analyzed the features of a new network architecture whose locator and identifier are separated, in order to improve the query and replacement efficiency of the identifier mapping, the backup of the locator/identifier mapping information needs storing in the most necessary place, which is a problem of cache management in fact .In this paper the typical cache management algorithms are analyzed firstly, and then a new aimed pushing and pre-fetching strategy is proposed according to the bidirectional interactive character of the communication activity in querying the mapping relationship, thus divided the Access Switch Router(ASR) cachespace into three section: Waiting_First_Access_Section (WFA), Frequently_Used_se- ction(FU) and Session_Duration_Section (SDU). And based on the identity mapping information reuse probability predicted by the Markov model, an information lifetime-based adaptive cache management algorithm is proposed. The simulation result shows that the performance of the buffer management algorithm proposed by this paper is better than those of the existing cache management algorithms such as LFU, LRU and LFU-LRU
Design and Implementation of Support Production Logging Comprehensive Interpretation System Platform
Authors: Wu Jiang , Ni Juan , Yuan Xiao Jiao
Published: February 2012

With the continuous development of logging interpretation technology, the basic information gathering from the logging, the logging documents and case knowledge, the result data from logging interpretation and so on are increasing massively, logging data management has gradually become an important oil-service management work. The Comprehensive interpretation of production logging support system platform develops in this paper, which major function lies in it provides an integrated platform for well logging data management, it provides software and data support for kinds of interpretation. At the same time it realizes the demand for process different data formats.
Optimal Design of Breakout Prediction System of Slab Continuous Casting
Authors: Wang Yi , Ma Xin Jian
Published: February 2012

This paper describes the new development of the breakout prediction technique based a heat transfer model. The model aims to minimize the variation in surface temperature. The breakout prediction system of slab continuous casting has been analyzed with consideration of the principles, model and thermocouples installation. The system has been designed and implemented in the steel plants.
A Modified Haze Removal Algorithm Using Dark Channel Prior
Authors: Wu Xiao Tian , Ding Xing Hao , Xiao Quan
Published: February 2012

In this paper, we propose a new algorithm to remove haze from a single input image. Based on the Dark Channel Prior proposed by He [1], we exploit the Gauss Bilateral Filter and the min operation to obtain an edge-preserving dark channel image, which is non-iterative, requires less time. We further utilize this dark channel image to extract the estimation of medium transmission, and finally recover a haze-free image from that. Furthermore, we use a self-adaptive algorithm to set the haze parameters to solve the color shift problem for large sky region. Experiments demonstrate our algorithm can effectively remove haze from a foggy image while keep edges sharp.