bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of Ni-Based Alloy Submicron WS2/CaF2 Composite Coatings Deposited by High Velocity Oxy-Fuel (HVOF) Spray Process
Authors: Zhang Xiao Feng , Zhang Long , Huang Zhen Yi
Published: January 2014

Ni-based alloy submicron WS2/CaF2 composite coatings were successfully produced through high velocity oxy-fuel (HVOF) spraying process. Microstructure characterization and morphology analysis on coatings were conducted using scanning electron microscopy and X-ray diffractometry. Tribological properties of coatings were carried out using a pin-on-ring tribometer at room temperature and 500°C, respectively. Results showed that WS2 in particles did not entirely decomposed during spraying process, submicron WS2 and CaF2 were uniformly distributed throughout the coating. Which lead a dense coating and a lower friction coefficient and better wear resistance. In ambient temperature, WS2 in coatings played a main role of lubrication, friction coefficient of coatings was in the rage of 0.25~0.35. But with the increasing of temperature, WS2 failed to provide solid lubricating films for pyrolysis, and CaF2 did not fully transfer from brittleness to plasticity, restrained solid lubricating film forming, friction coefficient reached to 0.45. Furthermore, average adhesive strength between coating/substrate was above 30MPa, which had positive affect on wear resistance of coatings.
J-Integral and Plastic Limit Load of Hole-Edge Crack in Plate under Biaxial Loadings
Authors: Zhang Yan Qing , Wang Zhong Xian , Xu Wei
Published: January 2014

Elastic-plastic J-integral and plastic limit load were described by finite element (FE) analysis for single hole-edge crack in plate under far field biaxial load. In this paper, the effect of biaxial load ratio (from -1 to 1) on elastic-plastic J-integral and plastic limit load was studied, the values of coefficient h1 for J-integral engineering estimation formulas were given and the effect of material hardening on plastic limit load was discussed. The result obtained from this work provides reference for fracture evaluation, so it can be used in engineering accurately and expediently.
Finite Element Analysis of Rolling Process for Pilger Mill
Authors: An Ning , Hai Liu
Published: January 2014

For the simulation of cold rolled 20Cr steel pipe rolling process the DEFORM-3D being used, the simulation results include the equivalent stress, equivalent strain and rolling force distribution in deformation zone. The stress state of the pipe reducer section is analyzed, analysis shows that the simulation result is approximate the theoretical calculation. The simulation result shows the roll pass and openning effect on the rolling pipe. A view put forward is to compare the simulation results with the actual production and find out their differences. A proposal is made to establish a corresponding database based on simulation and production data.
Preparation of Manganese Dioxide Loaded Active Carbon and its Adsorption Dynamic
Authors: Zhang Jiao Jing , Wang Lu , Song Hua , Song Hua Lin , Chen De Yu
Published: January 2014

Manganese dioxide loaded active carbon absorbents (MnO2/AC) were prepared. Mixture of H2S and N2 is used to evaluate the performance of absorbents in fixed adsorption bed for H2S removal. A suitable H2S removal activity was obtained with adsorbent of manganese dioxide to active carbon ratio of 1:1, drying temperature of 120°C, drying time of 24 h. The breakthrough time of 70 min with total gas volume of 1400 mL, adsorption temperature of 40°Cwere observed. Comparing with the unmodified active carbon, its breakthrough H2S capacity increased by 96.9 mg·g-1.
Describing the Influence of Ink Type on Ink Penetration and Distribution
Authors: Li Ying , Gu Wen Juan , He Bang Gui
Published: January 2014

Ink is transferred and sets onto the paper surface in the printing process, which affect printing quality and usage of ink. The objective of this experiment was to investigate the influence of ink type on ink absorption and characterize the penetration depth through quantitative analysis by Laser Scanning Confocal Microscope (LSCM). Fluorescent ink was used to observe and characterize ink penetration by LSCM. Three-dimensional images of ink pigment penetration were obtained by reconstructing all XY plane images. It could be concluded Common offset printing ink compared with UV offset printing resulted in deeper ink penetration ,uneven ink distribution and lower print density. Because the composition and drying method of UV offset printing ink and common offset printing ink were significant different, penetration depth and distribution uniformity of these two types of offset printing ink in coated paper were distinct.
Research on the Relationship between Drying Method and Binder Distribution by Tracing Technique
Authors: Li Ying , Gu Wen Juan , He Bang Gui
Published: January 2014

To observe binder distribution, and obtain the relationship between drying method and binder distribution in the z-direction, Rhodamine B was used to stain the binder and as the probe to characterize z-directional distribution of the binder using LSCM. The results implied that it was reliable and effective method using LSCM to characterize the z-directional distribution of binder and analyze the influence of dry method on binder migration. It could be concluded that the dry method was critical to binder distribution in coated paper and vacuum drying accelerated binder migration to the base paper, however vacuum drying made uniform binder distribution. Infrared drying was good to producing little binder migration towards the interior of base paper, but infrared drying was disadvantageous to even binder distribution.
Research on Mechanochemical of Silica and its Composite Powders
Authors: Zhu Jing Jing , Gu Hua Zhi , Peng Tian Xing , Sun Bao Hua
Published: January 2014

Silca and its composite powders added different amount of microsilica were ground in a planetary ball mill (QM-3SP4) at various grinding period with addition of a certain number of grinding aid. The effects of mechano-chemical on particle size, crystal size and lattice deformation in grinding process were analyzed. The phase compositions and size compositions of the treated powders were investigated by X-ray Diffraction (XRD) and Laser Particle Size Analyzers. With the increase of grinding time, the particle size decrease, the specific surface area increase, and the more amount of microsilica added, the smaller particle size the powders had after grinding. The XRD results showed that the diffraction peak intensity of powders weaken and gradually widen. The surface of the particle happened to amorphization, and occurred grain refinement and lattice distortion. Comparing with other treated powders, the change of the powders with the microsilica addition of 5% was larger. Even though the grinding time reached to 30h, the crystal transformation of SiO2has not been detected.
Modification and Application of Sodium Bentonite in the Coating of Color Ink-Jet Paper
Authors: Yang Yong Gang , Gao Qiao Zhuo
Published: January 2014

In order to know the application of bentonite in color ink-jet paper, an acid bentonite was prepared by modifying with sulphuric acid. Both of sodium bentonite and acid bentonite were characterized and evaluated with scanning electron microscope. The study result from printing quality testing showed that if the formulation of acid bentonite, under the dosage of 35% PVA and PDMDAAC 3% respectively, was used as the pigment, the print effect could be better.
Effects of Fuel on Gasification Dephosphorization of High-Phosphorus Oolitic Hematite Ore
Authors: Liu Fan , Zhang Wei , Xing Hong Wei
Published: January 2014

Through using jiuquan bituminous coal, yangquan anthracite, coking coal and charcoal as fuel,under 900 °C simulating the preheat layer of sinter process,research the influence of fuel types and content on gasification dephosphorization.Results show that due to the different volatile matter of coal, the influence on gasification dephosphorization is different, the influence of the highest volatile bituminous coal to the dephosphorization effect is best when carbon content takes 4%.
Kinetics of Fe2+ Oxidization at Different Initial Fe2+ and Fe3+ Concentration in the Presence of Moderate Thermophilic Bacteria
Authors: Xie Hai Yun , Ye Qun Jie , Tong Xiong , Gao Li Kun , Liu Ji Xing
Published: January 2014

In the bacterial leaching, the oxidation of Fe2+ is very important process. According to the results of this paper, Fe2+ and Fe3+ concentration effect on the growth of moderate thermophile. The optimum conditions for growth of moderate thermophile are the initial concentration of Fe2+ at 0.16mol/l. It indicates the existence of the optimum conditions including initial concentrations of Fe2+ and Fe3+ for the bio-oxidation Fe2+. To increase the initial concentration of Fe3+ can enhance the oxidation rate of Fe2+. The dynamic model of the moderate thermophile oxidation Fe2+ has been established by analyzing and calculating test data with the Matlab software.
Optimization of Soft Reduction Process for Continuous Thick Slab Casting
Authors: Han Tao , Cheng Chang Gui , Mei Jun Xue , Zhu Jia Fa , Jin Yan
Published: January 2014

In this paper, a two-dimensional non-steady-state heat transfer model has been established for the working conditions of thick slab in a steel plant in China, a modification has been made on the basis of the nailing experimental results, the slab solidification difference of practice and prediction by field heat tracing model has been analyzed. The results show that the actual solidification end point of slab is more close to meniscus than prediction, the distance difference is 0.592m, the better soft reduction zone is from 0.2 to 0.9, which the level of central segregation can be reduced from the class B 1.0 to C 1.0.
Ca-Si Alloy Addition Followed by Acid Leaching as a Route to Solar-Grade Silicon
Authors: Zou Peng , Wei Kui Xian , Ma Wen Hui , Xie Ke Qiang , Wu Ji Jun , Luo Tao
Published: January 2014

In present, refining of metallurgical grade silicon is one of the promising routes to low-cost solar grade silicon for solar cells. Alloying with Ca has shown a great potential as efficient refining method of MG-Si in combination with acid leaching. Compared with Ca metal, Ca-Si alloy is cheaper and more secure. Great removal of impurity depends on microstructure of MG-Si after alloyed with Ca-Si alloy. In the work, the change of impurity phase which was performed by the change of the microstructure of MG-Si before and after alloyed with Ca-Si alloy has been analyzed. It was determined that CaSi2phase contained significant phosphorus content after alloying with Ca-Si alloy, It also investigated the optimal acid leaching condition after leaching, which confirmed that metallurgical grade silicon with Ca-Si alloy addition followed by acid leaching could be a potential route to remove phosphorus from MG-Si.
Effects of Solid Solution Temperature on the Structure and Properties of TC16 Titanium Alloy Bars
Authors: Liu Quan Ming , Zhang Zhao Hui , Yang Hai Ying , Liu Shi Feng
Published: January 2014

The effects of solid solution temperature on the structures and properties of TC16 titanium alloy bars that made solid solution treatment in 780°C, 800°C, 850°C, 900°C, respectively, the processing time for 30min, then cooled in the air were studied. The results show that during solid solution treatment under 800°C, the alloy structures are the primary ɑ phase and the metastable β phase, while solid solution temperature rise to 800°C, the alloy structures begin to appear ɑ" martensite phase. With the increase of solid solution temperature, the alloy grain grow up somewhat, material tensile strength increases gradually, yield strength firstly decreases and then increases, elongation at break firstly increases and then decreases, percentage reduction of area at break decreases gradually. Solid solution state of TC16 titanium alloy bars are not suitable for cold heading forming, strengthening the titanium alloy must be subsequent artificial aging treatment.
The Characters of Bairendaba - Huanggangliang Deposits, Inner Mongolia, China
Authors: Xu Shan , Liu Yun Feng , Yang Yong Qiang , Li Shou Yi
Published: January 2014

The paper systematically analyzed the relationships between geological conditions including strata and magmatic rock, etc and lead-zinc deposits, and found out their control action and features on Pb-Zn and Fe-Sn deposits, then established the comprehensive prospecting model for Pb-Zn and Fe-Sn deposits that consisted of geological, geochemical and mineralization information, which will provide theoretical basis for predicting the lead-zinc metallogenic deposits within this metallegenic belt.
Geological Significance of the Volcanic Rocks in Weinan Area, Eastern Tianshan, China
Authors: Liu De Wen , Wang Gen Hou
Published: January 2014

The Lower Carboniferous Series Yamansu Formation volcanic rocks in eastern Tianshan are composed of basic and neutral-acid rock types, and defined as the calc-alkaline series. These volcanic rocks have the features of the typical island-arc or the continental marginal arcs. The result of the Rare Earth Elements shows that the negative anomaly of the Nb, Sr, P and Ti in the neutral-acid rocks, and it might be caused by the continental crust involved. The REE changes curves lean to the right smoothly. The LREE is enrichment and δEu is negative anomaly show that the rocks could have the same source, and the magma could go through the strongly fractional crystallization processes. The fault belt and the volcanic and sedimentary formation controlled regional mineralization. The metallogenic materials are enriched surrounding the rock mass. The stratum are abundant of copper and zinc, so that is very important to study its geological and geochemistry features in this area.
The Solution Chemistry of the Effect of the Dissolved Ions on the Flotation Process in Collophane-Dolomite System
Authors: Shen Zhi Hui , He Xiao Tai , Zhang Qin , Huang Xiao Fen
Published: January 2014

The grain size of collophane and dolomite in phosphate ore is tiny, and the interaction of dissolved ions in solution and the re-adsorption of dissolved ions on mineral surface have a great influence on the flotation process. Because carbonate and phosphate have the similar surface properties, which have the larger concentration of the dissolved component in the pulp, and the dissolution, adsorption and equilibrium of mineral ions have a larger effect on the flotation process. In this experiment, cellophane-dolomite system was used as the research object, the solution chemistry of the effect of mineral dissolved ions on the flotation process was discussed. The test results show that under the open system, the pH of pulp increases and maintains at between 9.64~9.73 in dolomite natural dissolution process. While in collophane natural dissolution process, the pH increases and maintains at between 8.94~9.06, and the buffer capacity of collophane is weaker than dolomite. In the alkaline range, as the major dissolved ions of mineral coexistence system, CO32-and PO43-affect the conversion and separation between minerals.
Theoretical Calculation of Dissolution Equilibrium for Cerussite in Pulp Solution
Authors: Feng Qi Cheng , Wen Shu Ming , Cao Qin Bo , Bai Xv , Zhao Wen Juan
Published: January 2014

The dissolution equilibrium of cerussite within the entire pH range was theoretically calculated, which was based on coordination chemistry, thermodynamics and the mass balance principle of Pb2+ and CO32- in pulp solution. The calculation result showed that the total lead concentration (CPbT) of cerussite decreased significantly with increasing pH below 6 or so; however, at pH of about 10, a reverse trend of CPbT may be observed. Within the pH range from 6 to 10, the CPbT of cerussite remained close and presents a minimum value of around 10-4 mol/L. This paper may provide a theoretical basis for the dissolution process of cerussite and its conditioning stage before benefication by adopting flotation method.
Nonlinear Regression Analysis of Binary Flooding Recovery Influence Factors
Authors: Zhang Yi , Fu Chun Ru , Zhu You Yi , Zhang Qun , Wu Jie
Published: January 2014

To better reveal the laws of binary (SP) oil flooding, based on the physical simulative experimental results of Berea core (400mD), the nonlinear regression method of the probability statistics theory and SPSS software was applied to conduct a weight analysis for the main influence factors of the binary oil flooding. The results show that the three factors of the viscosity of binary system, the composite emulsifying index and the interfacial tension affect the chemical flooding recovery and the total recovery significantly. The results of the forced introduction method show that the reliability of the effect of the three factors on y1, namely the chemical flooding recovery, is higher than 99%. The stepwise introduction method and the backward elimination method prove that the reliability of the effect of the three factors on y2, namely the total recovery, is higher than 95%. The results also indicate that emulsification affects the binary chemical flooding recovery of moderately and highly penetrated sandstone cores more significantly.Introduction
Activity Calculation Model for Oxygen Converter Final Slag
Authors: Wang Ting , Qiu Wen Dong , Gu Hua Zhi , Zhao Wei
Published: January 2014

In this paper the activity calculation model for SiO2-Al2O3-CaO-MgO-FeO-MnO slag system has been established according to the molecule-ion coexistence theory. From that the activity of each component in the converter slag at steelmaking temperature can be calculated and then provides the basis for analyzing the equilibrium distribution of element between slag and steel, as well as thermodynamics analysis related to the activity.With the increasing of FeO mass fraction, the activity of 3CaO.SiO2 shows a significant decreasing trend and the activity of MnO.SiO2 and 2MnO.SiO2 increases slowly. The activity of 3CaO.SiO2 increases at first then decreases, with the increasing of basicity. When the basicity w(CaO)/w(SiO2)=3, the activity of 3CaO.SiO2 reaches its maximum value. The activities of MnO.SiO2 and 2MnO.SiO2 decrease gradually.
Microseismic Monitoring and Numerical Simulation Research of Floor Failure Depth in Extra-Thick Coal Seam
Authors: Cheng Ai Ping , Gao Yong Tao , Liu Chao , Chai Jin Fei
Published: January 2014

Based on the condition of fully mechanized caving face in one mine, two methods of microseismic monitoring and numerical analysis were combined to study the evolution characteristics and development law of floor failure depth in extra-thick coal seam. Microseismic monitoring results show that the number of microseismic events partly reflects the influence of mining disturbance in the roof and floor rock mass. The distribution of microseismic events are intensive near the coal mining face, which show the floor rock mass is seriously damaged during the coal mining. The greatest floor failure depth estimated from mine microseismic monitoring is 31 meters. Numerical analysis indicate that the rock stress around the mine stope is redistributed during the coal mining, due to the effect of mining disturbance. The abutment pressure increases in front of the coal mining face and the stress reduces in the mined areas. The concentration and release of the stress makes contribution to the destroy of the floor rock. The maximum floor failure depth is up to 28 meters calculated from numerical simulation. The consistency of microseismic monitoring results and numerical analysis improve that it is effective and reliable to obtain floor failure depth and considerably possible to predict the water inrush using microseismic monitoring technology with its inherent ability to remotely monitor the progressive failure caused by mining. The research results have great popularization and application values for the similar mine.
Direct Current Heating Model for the Siemens Reactor
Authors: Hou Yan Qing , Xie Gang , Nie Zhi Feng , Li Nan
Published: January 2014

The modified Siemens process is the primary technology of polycrystalline production at present. The Siemens reactor, which is the main equipment in the modified Siemens process, consists of a chamber where several high purity silicon slim rods are heated by an electric current flowing through them. The temperature on the rod centre must be under melting temperature of silicon (1687K) in order to avoid its breaking-down because of an uneven temperature profile of the silicon rod. Therefore the temperature profile of the silicon rod heated by direct current (DC) has been investigated by molding. The current density profile of silicon rod has also been studied to investigate the interaction of current density and temperature. The results show that the temperature is not homogeneous in the rod and the temperature in the center of the polysilicon rod is 1750K which is much higher than the melting temperature (1687K) when the temperature is 1423K on the surface of polysilicon and the radius of rod is 5cm. Therefore, the maximum growth radius of the polysilicon rod in Siemens reactor should be less than 5cm when the joule heating generated by DC. The current density increases from the center to the surface of the polysilicon rod.
Uncertainty Evaluation of Copper Reference Solution
Authors: Li Yu Lei , Liao Dong Mei , Rui Rui
Published: January 2014

In fuel-fired power plants, error resulting from test process of copper content should be decreased to minimum because trace copper is in the steam-water. 100μg/mL copper reference solution is prepared in the laboratory and its concentration is determined by means of EDTA compleximetry. Then the uncertainty is analyzed and calculated from every factor. The result shows that the expanded uncertainty of 100μg/mL copper reference solution is 0.6μg/mL.
A Coaxial Measurement System for Electromagnetic Parameters at Microwave Frequencies
Authors: Liu Xing , Chen Xian Yan , Lin Yuan , Ye Long Fang , Xiao Fen , Liu Qing Huo
Published: January 2014

In this paper, an improved coaxial measurement system with a newly designed coaxial fixture is presented. The electromagnetic parameters of samples are retrieved from the scattering parameters measured by a vector network analyzer (VNA) at microwave frequencies. The measurements of air and PTFE in the range of 1~6 GHz were carried out to verify the reliability and the accuracy of this measurement system. By using frequency-sweep and data processing techniques, the multiplicity of roots is eliminated. The results show that this system can effectively be applied to measure the material electromagnetic parameters of absorbing materials with high accuracy in a wide frequency band.
X·F (X=C, N, O and S) Noncovalent Weak Intermolecular Interactions
Authors: Liu Yan Zhi , Tang Huian
Published: January 2014

A number of X···F (X=C, N, O and S) noncovalent weak intermolecular interaction systems of CH3-F···XO2 (X=C, N, O and S) has been investigated at B3LYP/6-311++G(d, p) computational level. A topological analysis of the electron density for the X···F (X=C, N, O and S) noncovalent weak bonds was performed using Baders theory of atom-in-molecules (AIM). The interaction content of the F···X in H3CF···CO2 complex would mainly represent more π property than others. The interaction energies data without (ΔE) and with (ΔEcp) BSSE correction showed that the stability of the four complexes of the H3CF···DB2 system increases in the order of H3CF···O3 < H3CF···NO2 < H3CF···CO2 < H3CF···SO2.
Chemical Constituents and Antibacterial Activity of Euphorbia altotibetica
Authors: Yang Ai Mei , Shi Xiao Long , Liu Jie Li , Yang Lin , Men Yun
Published: January 2014

Five compounds were isolated from the EtOAc extract of Euphorbia altotibetica. The structures of these compounds were elucidated as: β-sitosterol (1), daucosterol (2), chrysophanol (3), (-)-epiafzelechin (4), 5,2-dihydroxy-7,8,6-trimethoxyflavanone (5) by NMR datas, the antibacterial activity of all compounds were examined on five species of bacteria Escherichia coli, Staphylococcus aureus, Bacillus licheniformis, Pseudomonas aeruginosa and Streptococcus pneumoniae.
Determination of Phoxim in Water Sample by Hollow Fiber Supported Ionic Liquid Coupled with High Performance Liquid Chromatography
Authors: Xu Shi Juan , Zhou Bo , Yan He Ping , Wu Na , Liu Wei
Published: January 2014

An easy, rapid sensitive and efficient method for the enrichment of phoxim in water sample based on enhancement effect of room temperature ionic liquid (1-butyl-3-methyl-imidazolium hexafluorophosphate, BmimPF6) for hollow fiber membrane liquid phase microextraction coupled with high performance liquid chromatography (HPLC) has been exploited. The influences of the analytical conditions such as the extraction time, stirring speed, NaCl concentration, extraction temperature, the pH of the sample solution, were studied.
Preparation of TiO2-Al2O3 Support and Hydrodenitrogenation over Ni2P/TiO2-Al2O3 Catalyst
Authors: Yan Jing Sen , Wang Hai Yan , He Feng Wei
Published: January 2014

A series of TiO2-Al2O3 composite supports were prepared by co-precipitation of titanium sulfate and aluminium nitrate , and the nickel phosphide catalysts were prepared by incipient wetness impregnation and in situ H2 reduction method. The catalysts were characterized by XRD, N2 adsorption, TPR, TEM and XPS techniques. Their hydrodenitrogenation (HDN) performances were evaluated by using quinoline as model molecules . The results show that TiO2 was evenly dispersed on massive γ-Al2O3 surface. The introduction of TiO2 weakened the strong interaction between Al2O3 and phosphate, and improved the reducibility of the precursors , facilitating to the formation of Ni2P active phase. TiO2 acted as an electronic promoter for the Ni-P catalyst and enhanced both the hydrogenation and C-N bond cleavage activities. Different Ti / Al molar ratio had great influence on HDN activity of the catalyst. The Ni2P /TiO2-Al2O3 with Ti/Al ratio of 1/8, exhibited the highest activity for quinoline HDN.
Design and Synthesis a Novel Supported Pd-Pt Mesoporous Composite as Catalysts for the Polyaromatic Hydrogenation
Authors: Wang Wei Qiang , Zhang Hai Juan , Wu Ming
Published: January 2014

Hydrothermally stable mesoporous aluminosilicates with tubular morphology and hexagonal nanochannels were prepared by a new route. The route is different from conversational method of highly ordered MCM-41 assembled from Beta zeolite seed colloidal. The synthesis of Beta zeolite-like seeds is a novel route of acid treatment. The XRD results indicated that the synthesized materials were well-ordered hexagonal mesostructures of MCM-41. The highly regular hexagonal mesostructures could survive by steaming at 750 °C for 2 h, exhibiting good hydrothermal stability. Combining the SEM investigation, the as-made materials showed tubular morphology with diameter of 0.4 μm. The sample has a stronger acid strength, and was used as the support of a Pd-Pt catalyst for the polyaromatics hydrogenation. It has high activity and good sulfur tolerance towards hydrogenation of aromatics of smaller diameter. It was demonstrated that the introduction of building units of Beta zeolite enhances the activity of polyaromatics hydrogenation. It can be concluded that the pore structure and acidity of support is a key factor for the design of a sulfur tolerant noble metal catalyst for aromatics saturation of diesel.
Reactivity of Olefins and Thiophenes in Hydrodesulfurization of FCC Gasoline
Authors: Liu Bin , Wang An Jie , Liu Chen Guang
Published: January 2014

The reactivity of olefins and S-compounds and their distributions in different catalyst-bed lengths were experimentally evaluated with a FCC gasoline in a high-pressure fixed-bed continuous flow pilot unit over the CoMoS/γ-Al2O3 catalyst. The evaluation results demonstrated that the increased steric hindrances around the double bond (C=C) and that to the thiophene molecules could suppress the hydrogenation of olefins and hydrodesulfurization (HDS) of S-compounds, respectively. Meanwhile, the reaction temperatures could influence the acidic property of the CoMoS active phase confirmed by FT-IR analysis, and thus induced the different reactions. It was found that the isomerization of terminal olefins to internal olefins was promoted by the Brønsted acid sites (-SH) at low temperatures, as well as the skeletal isomerization by the strong Lewis acid sites occurred to a minor extent at high temperatures. Besides, the distributions of olefins and S-compounds in different catalyst-bed lengths showed that the removal of S-compounds reached 80% of its maximum conversion at the first 40% of the reactor length, however, the saturation of olefins increased linearly as the reactor length increased. Therefore, a new catalyst-loading method was developed, i.e., the upper 40% of the reactor length filling with catalyst of high HDS activity and the bottom 60% with catalyst of low olefin saturation activity, respectively. The evaluation results showed that the graded catalyst loading process showed higher selectivity in HDS of FCC gasoline.
The Bimetallic Synergistic Effect in Heterogeneous UV/Fenton System for the Treatment of Refractory 6-Nitryl Wastewater
Authors: Xiong Wei , Liu De Rong , Yuan Guo Yuan , Wei Qi , Dang Quan Sen , Feng Jian , Xu Bin
Published: January 2014

Nowadays, ultraviolet (UV) irradiation heterogeneous Fenton-like reactions have widespread used in organic wastewater treatment. In this paper, Fe2+ and Cu2+ were load in Na-Y molecular sieve using impregnation method. Fe-Y, Cu-Y and Fe-Cu-Y catalysts were obtained. The Fe-Cu-Y catalyst showed good performance in the degradation of 6-nitryl wastewater. When the volume of 6-nitryl wastewater is 100 mL, the optimal reaction conditions were found to be 3mL of hydrogen peroxide, 7.5g of catalyst weight, 250W of UV power. Under these conditions, the degradation rate of CODCr can be up to 97.0%.
Optimization of Furfural Production from Xylose by RSM Using Chromium Sulfate as Catalyst
Authors: Zhang Ye , Chen Ming Qiang , Wang Jun
Published: January 2014

Optimization of chromium sulfate catalyzed conversion conditions of xylose into furfural was studied by response surfacemethodology (RSM). A central composite design (CCD) was used to determine the effects of independent variables, including temperature (120-160°C), time (30-150min), catalyst loading (1-5mmol) and moles of xylose (2.5-12.5mmol) on furfural yield, xylose conversion and solid residue. The surface response analysis revealed that temperature, time, catalyst loading and moles of xylose had a strong influence on the furfural yield, whereas moles of xylose was found to be notsignificant for xylose conversion. The solid residue was affected by temperature, time and moles of xylose. The maximumpredicted furfural yield was 45.07% at temperature of 150°C, time of 12min, catalyst loading of 2 mmol and moles of xylose of 10mmol. Under this condition, xylose conversion could be reached 100%.
Efficient Catalytic Hydrodechlorination of 4-chlorophenol in Water over Rh/AlO(OH) Catalyst
Authors: Fan Guang Yin
Published: January 2014

The catalytic hydrodechlorination of 4-chlorophenol promoted by different hydrophilic catalysts based on Pt and Rh on aluminum oxy-hydroxide (AlO(OH)) was carried out in water at 30 °C under atmospheric pressure. Among these catalysts, Rh/AlO(OH) was effective in the removal of 4-chlorophenol, with phenol, cyclohexanone, and cyclohexanol identified as reaction products. The Rh/AlO(OH) catalyst showed excellent hydrodechlorination performance in water than organic solvents, 4-cholophenol was completely dechlorinated within 60 min in water in contrast to less than 26 % in organic solvents. Furthermore, the Rh/AlO(OH) catalyst can be recycled four times without any inorganic and organic additives.
Efficient Hydrogen Production by Catalytic Dehydrogenation of Methylcyclohexane over Ni-Pt/ Nano-Film Alumina Catalyst
Authors: Wang Feng , Yang Yun Quan , Wang Wei Yan
Published: January 2014

The Ni-Pt bimetallic catalyst supported on nanofilm alumina was prepared by coprecipitation method under the assistance of ultrasonic vibration. The characterization result revealed that the prepared catalyst had a good dispersion with an average particle size around 7nm. The activities of supported catalyst of Ni, Pt and Ni-Pt were compared through using the dehydrogenation of methylcyclohexane (MCH) to produce toluene in Microreactor-Gas Chromatography System (MGCS). The conversion and the selectivity of the Ni-Pt catalyst at 350°C for the dehydrogenation of MCH was 97.0% and 100%, respectively. It was found that the bimetallic synergistic effect between Ni and Pt particles would affect the catalyst performance. The addition of Ni into Pt/γ-Al2O3 catalyst was beneficial to decrease the use of Pt in the dehydrogenation.
Synthesis of Esomeprazole through Asymmetric Oxidation
Authors: Li Zhi Cheng , Kong Xiao Bo , Mai Wen Peng , Sun Gang Chun , Zhao Shi Zhao
Published: January 2014

N,N'-dicyclohexyl-D-tartaric diamide 2a andN,N'-di-[(R)-inda-D-tartaric diamide 2b were prepared through the reaction of diethyl-D-tartrate with cyclohexylamine and (R)-(-)-1-aminoindan, respectively. The two compounds coordinated with isopropyl titanate (Ti (O-iPr)4), were used as catalyst in the asymmetric oxidation of pyrmetazol 3 with cumene hydroperoxide (CHP) as oxidant. The results revealed that both the catalytic systems derived from ligand 2a and 2b with Ti (O-iPr)4showed good catalytic activity and enantioselectivity in the synthesis of esomeprazole. Under the optimized conditions, the yield reached 91%, 91% and the enantio excess (ee) was up to 87% , 89%.
Radiation Threshold Damageability of Cells Depending on the Availability of the Cell Nucleus
Authors: Dyachkov V.V. , Zaripova Y.A. , Riger N.G. , Shakirov A.L. , Yushkov A.V.
Published: January 2014

The paper describes biophysical processes occurring in membranes under the influence of alpha-radiation of radon isotopes. The basic idea is to experimentally detect the effects of radiation damage to cells of the α-particle with energy of 5.5 MeV, and in particular, to determine the dependence threshold in a function of the "dose-effect" in the presence of DNA molecules into cells. Actuality of work related to the fact that up to now remains open the problem – is whether damageability of radioactive radiation threshold or without threshold phenomenon. It was found that the irradiation of biological models of cells - liposomes and spherosomes uniquely showed the lack threshold of damageability. Irradiation red blood cells not having a cell nucleus, occurs as a threshold phenomenon. Finally, the irradiation of the lactic acid bacteria occurs with a high threshold
Development of Dencichine Plus Yunnan Baiyao Band-Aid
Authors: Wang Zhen , Yang Jing Ya , Chen Qi
Published: January 2014

This study aims to develop the dencichine plus Yunnan Baiyao band-aid, and test the hemostatic effect in traumatic incision of the new band-aid, the stability of dencichine was measured by HPLC beforehand. After that, several groups with different material were pasted on longitudinal incision of SD rats. Bleeding time and blood loss was determined, observing the healing of the wounds. The result was that the stability of dencichine by HPLC proved to be steady beforehand. Compared with blank control group, the other groups could shorten bleeding time (p<0.01), and reduce blood loss (p<0.01), whats important is that the Yunnan Baiyao band-aid groups were much better about the healing of the wounds than gauze groups. The results indicates that it is obvious that dencichine plus Yunnan Baiyao band-aid has a significant effect on longitudinal incision, and it helps the wound to heal. Dencichine plus Yunnan Baiyao band-aid has economic prospect in marketing appliance.
Study on Antioxidant Activity of Pigment in Black Soybean Peel
Authors: Li Qiong Jie , Xiao Chun Ling
Published: January 2014

With black soybean as raw materials, 50% ethanol as the extractant, at 70°C, pH1.0, solid-liquid ratio of 1:100(g:mL), at 90min were used to extract the pigment of black soybean Through the establishment of DPPH•,•OH, superoxide anion free radicals, reducing power and hydrogen peroxide. The results show: its ability of scavenging DPPH•, •OH, hydrogen peroxide is far better than ascorbic acid. The pigment at concentration of 0.6mg/mL shows a scavenging rate for DPPH• up to 88.29%,and for •OH 89.36%,for hydrogen peroxide89.75%.In addition，the general reducing power and scavenging rate for superoxide anion solution of the pigment are a little worse than those of ascorbic acid.
Synthesis and Characterization of S-Tenatoprazole
Authors: Yan Feng , Li Ying , Li Ze Hui
Published: January 2014

Make 5-methoxy-2-mercapto-imidazo[4,5-b]pyridine and 2-chloro-3,5-dimethyl-4-methoxy-pyridine hydrochloride as the starting materials, in alkaline conditions, use nucleophilic substitution to generate the prochiral sulfide: 2-[2-(4-methoxy-3 ,5-dimethyl-pyridine) methylmercapto]-5-methoxy-imidazo [4,5-b] pyridine. After recrystallization twice, gain the product with the yield of 80%, and the purity of 99.6% and above. Then make D-(-)-diethyl tartrate and tetraisopropyl titanate as the chiral reagents, in alkaline conditions, use cumene hydroperoxide oxide to oxidize prochiral sulfide, for synthesis of (S)-Tenatoprazole, and the results showed that when, the reaction temperature was , and reaction time was 20h, the result was the best.
Three-Dimensional Protein Structure Prediction for CD36
Authors: Tao Wei Ye , Wang Lai You , Huang Guo Quan , Luo Man
Published: January 2014

CD36 is a class B scavenger receptor, which is on the surface of many cells such as platelets, macrophages, endothelial and smooth muscle cells. CD36 has been shown to play a critical role in the development of atherosclerosis by its capacity to adhere oxidized low density lipoproteins (OxLDL). It’s very valuable to find out the antagonists for CD36, but the three-dimensional protein structure of CD36 has not been determined and there are no template structures in the PDB library, which greatly prevents the antagonist discovery from structure-based drug discovery. The aim of the present study is to predict the three-dimensional structure using computational methods by I-TASSER.
Synthesis of Bicyclic Furo[2,3-d]pyrimidine Deoxynucleosides Conjugated with N-Diisopropylphosphoryl Amino Acids
Authors: Yang Ru Chun , Zhu Hui , Jin Xuan Ye , Xiao Qiang , Ju Yong
Published: January 2014

A series of bicyclic furo[2,3-d]pyrimidine nucleosides conjugated with N-diisopropylphosphoryl amino acids were synthesized from 2′-deoxy-5-iodouridine. The key step is its cross coupling with the 5-phthalimido-1-pentyne under Sonogashira reaction condition. 5-Endo-dig electrophilic cyclization catalyzed by AgNO3 is used to afford the furo[2,3-d]pyrimidines.
Study on Synthesis of (R)-tert-butyl (1-hydroxybut-3-yn-2-yl)carbamate
Authors: Tang Lin Jun , Lv Chang Shan , Liu Dong Wang , Qin Shuang Lin , Wang Li Ping , Li Yu Ping , Wang Xiao Ji , Huang Shuang Ping
Published: January 2014

(R)-tert-butyl (1-hydroxybut-3-yn-2-yl) carbamate, an key intermediate of the natural product jaspine B which was isolated from various sponges and endowed with cytotoxic activity against several human carcinoma cell lines, was synthesized fromL-Serine in overall yield 41% through seven steps, including esterification, Boc protection, acetonization, reduction,Corey-Fuchs reaction and deprotection.
Comparative Analysis of Compositions between Calcium Phosphate Calculi and Urinary Crystallites in the Stone-Formers
Authors: Zhu Wen Yu , Xu Meng , Wang Feng Xin , Ouyang Jian Ming
Published: January 2014

The chemical composition of urinary crystallites of less than 1000 nm from 10 calcium phosphate (CaP) stone-formers were investigated and compared with that from healthy subjects using X-ray power diffraction, Fourier transform infrared spectroscopy and nanoparticle size analyzer. Although there were some calcium oxalate monohydrate (COM) crystals in CaP stones, the main components of crystallites in urine of CaP stone formers were uric acid (UA), CaP and COM, while that in healthy urine was mainly UA and a small amount of COM. That is, the CaP content in urinary crystallites of CaP stone-formers was significantly higher than that of controls. The particle size range of crystallites in lithogenic urine was 3~1000 nm and most of these crystallites were aggregated, but it was 30~500 nm in healthy subjects.
Production of Personalized Thyroid Cartilage Scaffold and Histological Analysis
Authors: Xia Wei , Cao Gao Xiang , Zhang Long Cheng , Liao Jie , Zeng Jian Min
Published: January 2014

To meet the bone defect on the personalized needs of implantation, this study presents the manufacture of personalized thyroid cartilage hydroxyapatite (HA) scaffold by the rapid prototyping(RP) technique combined with CT image reconstruction and employs the foaming of suspensions prior to the in situ polymerization of organic monomers contained in the compositions. The organic additives are eliminated at temperatures above 300°C, and sintering is carried out for consolidation of the ceramic matrix. Spherical interconnected cells with sizes ranging from 100μm to 250μm characterize the porous structure, depending on the specimen density. The biological properties of porous personalized scaffolds loaded with bone morphogenetic protein 2 (rhBMP-2) were evaluated, by which a simulated surgical method of thyroid cartilage defects in rabbits and repairing with artificial scaffolds, and compared with rhBMP-2 loaded dense personalized or porous non-personalized scaffolds. The results of the histological analysis and the electronic laryngoscope inspection of airway indicate that rhBMP-2/HA/ porous personalized scaffolds is a promising composite having osteogenic efficient enough for repairing thyroid cartilage defects.
The Removal of Strontium(II) and Neodymium(III) from their Aqueous Solutions on Chrysotile Nanotubes
Authors: Cheng Lei Lei , Wei Xiao Dong , Hao Xiao Lei , Ruan Di , Yu Shao Ming
Published: January 2014

In this research, chrysotile nanotubes (ChNTs) were synthesized by the hydrothermal method. Synthetic ChNTs were characterized using XRD, SEM, TEM and N2adsorption-desorption. Adsorption technique was applied for removal of Sr (II) and Nd (III) from aqueous solution by using ChNTs. The process had been investigated as a function of pH and temperature. The experimental data were analyzed using equilibrium isotherm models. The adsorption isotherms are fitted well by Langmuir model, having a maximum adsorption capacities of 102.56 mg·g-1for Sr (II) and 47.44 mg·g-1for Nd (III) at 298 ± 1 K. FTIR and XPS techniques were employed to investigate possible adsorption mechanism.
Using Lix984 to Recover Cu2+ from Plating Wastewater Containing Chloride
Authors: Li Li Qing , Tan Yun Peng , Yang Li Qin
Published: January 2014

There is abundant Cu2+in plating wastewater containing chloride. Lix984, which is mainly applied in sulphate medium to extract Cu2+, was chosen as the extractant due to it has good performance. The influence parameters for extraction efficiency have been investigated. The results showed that Lix984 can successfully separate Cu2+from simulating plating wastewater in chloride medium. And more, the maximal extraction efficiency is up to 93.3% for Cu2+by single-stage extraction, and recover Cu2+in hydrochloric acid medium by stripping, it can be obtained that stripping of copper >95.2%. These results can greatly broaden an application field of Lix984, especially in the field of acidic wastewater containing chloride and leaching solution with hydrochloric acid of mining process, in addition, it can provide help for the decreasing of environment pollution and recycling Cu2+.
Optimization of HS-SPME for GC-MS Analysis of Volatiles Compounds in Roasted Sesame Oil
Authors: Fang Zhao Xi , Liu Guo Qin , Wang Xue De , Han Li Juan , Liu Bing Ge
Published: January 2014

This paper was to develop a simple and rapid headspace solid-phase microextraction (HS-SPME) method coupled with gas chromatography–mass spectrometry (GC-MS) for the determination of volatiles compounds from the roasted sesame oil (RSO). A HP-5MS capillary column (30 m × 0.25 mm I.D. × 0.25 mm film thick) was used for GC-MS, and a 50/30 μm divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber was used to extract volatiles compounds. The condition was optimized by varying the sample-to-headspace ratio (0.5-2.5 g/15 ml), extraction time (10-50 min) and Splitless time (0.5-4 min). The results showed that the optimal operating conditions occurred at (extraction temperature:40°C, sample-to-headspace ratio: 1.5 g/15 ml, extraction time: 40 min, Splitless time: 1 min) for the analyze method.
Review of Treatment Methods for Fracturing Flowback Fluid
Authors: Li Fu Bao , Yang Jun Jie , Li Qin , Wu Hao
Published: January 2014

Through analyzing and comparing the treatment of fracturing fluid flowback at home and abroad, it can be found that fluid derived organic waste water can be handled by micro electrolysis economically and efficiently. But there are also some shortages of traditional micro electrolysis. So this paper discusses a new micro-electrolysis technology, namely cavitation-impinging stream electrolysis technology which has several advantages in high concentration organic wastewater treatment. The technology can not only solve the problems that the passivation of process and the plugged equipment in the treatment of fracturing fluid flowback fluid by traditional micro electrolysis, but also can better promote the reaction from the reaction kinetics with the help of Coupling application about cavitation and impinging stream technology, so as to realize the purpose of improving the reaction rate and efficiency.
Extraction Kinetics and Mechanism of La(III) by P204-Kerosine from Phosphoric Acid
Authors: Xiao Yun Shan , Dang Ya Gu , Fei De Jun , Zhang Ying
Published: January 2014

The extraction kinetics and mechanism of La (III) by P204-kerosine from phosphoric acid were investigated by constant interfacial cell with laminar flow. The effects of stirring speed, temperature, specific interface area on extraction rate were studied. The results indicated that a plateau region is appeared at the stirring speed of over 115r/min. The extraction apparent activation energy was calculated to be-13.40kJ/mol and the extraction process is controlled by a mixed mechanism of diffusion and chemical reaction. The rate equation of extraction was deduced. Under conditions of 25°C and interfacial area 19.64cm2, the extraction rate constant was 2.08×10-6 m·s-1·. Through the derivation of the reaction mechanism the reaction zone is at the liquid-liquid interface.
Solid-Liquid Equilibria for Binary Mixture of Dichlorophenols
Authors: Wang Yan Fei , Huang Qi Shan , Yang Li Bin , Zhu Liang
Published: January 2014

Differential Scanning Calorimeter (DSC) was used to investigate the thermal properties of 2,4-dichlorophenol+2,6-dichlorophenol and 2,4-dichlorophenol+2,3-dichlorophenol binary systems. The experimental results showed that The phase diagram of 2,4-dichlorophenol+2,6-dichlorophenol system was a simple eutectic type with the eutectic point at 294.99 K and 0.6200 mole fraction of 2,4dichlorophenol; The phase diagram of 2,4dichlorophenol+2,3dichlorophenol system was a simple eutectic type with the eutectic point at 291.86 K and 0.5834 mole fraction of 2,4dichlorophenol. Furthermore, the activity coefficients of components in mixtures of 2,4dichlorophenol+2,6dichlorophenol and2,4dichlorophenol+ 2,3dichlorophenol binary systems have been correlated by the Wilson model, respectively.