bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and Crystal Structure of 1-(2R,3S,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-iodopyrimidine-2,4(1H,3H)-dione
Authors: Li Wei , Xiao Qiang , Yang Ru Chun
Published: August 2014

The title compound, 1-(2R,3S,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl) tetrahydrofuran-2-yl)-5-iodopyrimidine-2,4(1H,3H)-dione , C9H10FIN2O5, as potential drugs for anti-tumor, anti-viral have been synthesized and characterized by NMR spectra. Meanwhile, the crystal of 2b was obtained and determined by X-ray single-crystal diffraction. Crystal data: monoclinic system, space group P2(1), a = 9.0832(11) Ǻ, b = 5.4332(7) Ǻ, c = 12.2464(15) Ǻ, β = 107.809(4)°, V = 575.41(12) Ǻ3, Z = 2, F(000) = 360, Dx = 2.148 Mg m-3, μ = 2.813 mm-1, R = 0.014 and wR = 0.056 for 1988 independent reflections (Rint = 0.0209) and 1932 observed ones (I > 2σ (I)).
Isolation and Expression Analysis of a Putative CIPK Gene in Halophyte Sesuvium portulacastrumand L.
Authors: Hu Yan Ping , Zhou Yang , Yang Cheng Long , Liu Jiao , Duan Rui Jun , Fu Shao Ping , Hu Xin Wen , Guo Jian Chun
Published: August 2014

Calcium plays a significant role in intracellular signaling. Calcineurin B-like proteins (CBLs) and their target proteins, CBL-interacting protein kinases (CIPKs) have emerged a calcium network responsing to stresses in plants. In this study, we cloned a CIPK gene, SpCIPK8, from the halophyte plant Sesuvium portulacastrumand L. Bioinformation analysis showed that the cDNA of SpCIPK8 was 1344 bp and encoded 447 amino acids with a molecular weight of 50.72 KD and an isoelectric point of 7.19. One transmembrane domain exists in this hydrophilic protein. Phylogenetic analysis showed that SpCIPK8 was similar with AtCIPK8 in Arabidopsis.The expression level of SpCIPK8 in stems was three times higher than that in roots and the level in leaves was two times higher than that in roots.
Synthesis of Methyl Methacrylate/Acrylic Acid/N, N’-4, 4’-Diphenylmethane-bismaleimide Copolymer and its Electricity Storage Characteristics
Authors: Lu Yue Qun , Dai Pei Bang , Zheng Ting , Fan Li Li , He Yu Ru
Published: August 2014

Methyl Methacrylate (MMA)/acrylic acid (AA)/N,N’-4,4’-Diphenylmethane-bismaleimide (BMI) copolymer was synthesized by free radical polymerization. The copolymer was characterized by the Fourier Transform Infrared (FTIR), and the memory characteristic of the device was investigated by current-voltage (I-V) test. The structure of the memory device which is based on MMA/AA/BMI copolymer was sandwich, the bottom electrode was indiumtin oxide (ITO) and the top electrode was Al. The ON/OFF current ratio of the ITO/(MMA/AA/BMI copolymer)/Al memory device is ≥1×102 and the switching threshold voltage is about 1.8v.
Preparation and Properties of Acidified Prevulcanized Natural Rubber Latex
Authors: Lu Guang , Yu He Ping , Wang Yong Zhou , Luo Yong Yue , Zeng Zong Qiang
Published: August 2014

After a maturation of three days at ambient temperature, the sulfur-prevulcanized natural rubber latex (SNRL) was stabilized by 20wt% Peregal O, and then acidified with the 36wt% acetic acid by a ratio of 5, 15, 25, 35 and 45 g of 36wt% acetic acid to 100g SNRL, to obtain acidified prevulcanized NR latex (ASNRL) with different acidity, respectively. The viscosity of ASNRL increased, while the nitrogen content decreased, with the increment of acetic acid content and the decrease in pH; for unaged samples, the tensile strength, elongation at break, 300% and 500% moduli of the ASNRL films were only slightly lower than those of SNRL film; however the hot-air aging resistance decreased with the increment of acetic acid content.
A Study on Pathway and QSPR Models for Debromination of PBDEs with Pseudopotential Method
Authors: Li Ling Yun , Lin Yi Miao , Hu Ji Wei
Published: August 2014

Neutral PBDEs congeners and their corresponding radical anions were studied with the pseudopotential method of stuttgart group (SDD) effective-core potentials basis set for the bromine atoms and the all-electron basis set for all other atoms. The pseudopotential method can be used for compounds containing heavy elements with relativistic effects and can reduce the computational time. The quantitative structure property relationship (QSPR) study was also performed in this work to develop models to predict the normolized reaction rate constants for the reductive debromination of polybrominated diphenyl ethers (PBDEs) by zero-valent iron (ZVI). The partial least squares regression (PLSR), principal component analysis-multiple linear regression analysis (PCA-MLR), and back propagation artificial neural network (BP-ANN) approaches were employed for the QSPR study between the molecular descriptors and the logarithm of normalized reaction rate constants of fourteen selected BDE congeners. The results show that the ANN models could be more satisfactorily to predict the rate constants than the PLSR and PCA-MLR models.
Synthesis, Structure Characterization and Photocatalytic Property of a New 3-D Polyoxovanadate-Based Organic-Inorganic Hybrid Compound
Authors: Liu Ya Bing , Yu Peng
Published: August 2014

A new polyoxovanadates-based organic-inorganic hybrid compound, [Cu(en)2]2[VV6VIV4O25] (1) has been hydrothermally synthesized and structurally characterized by the elemental analysis, and single crystal X-ray diffraction. Compound 1 consists of [Cu(en)2]2+ transition metal coordination fragment and the [VV6VIV4O25]4- building blocks, which are linked together via covalently-bonding interactions to form a new 3-D networks. The degradation of rhodamine B (RhB) under UV-vis irradiation with 1 as the heterogeneous photocatalyst has been investigated, showing a good photocatalytic property of 1 for RhB degradation.
Density Functional Theory Investigation and Detonation Characterization of DNPDNAZ
Authors: Li Hong Ya , Zhang Tian Tian
Published: August 2014

N-2’,4’-dinitrophenyl-3,3-dinitroazetidine (DNPDNAZ) is an important derivative of 3,3-dinitroazetidine (DNAZ). The density functional theory (DFT) method of the Amsterdam density functional (ADF) was used to calculate the geometry and frequencies. The detonation velocity (D) and detonation pressure (P) of DNPDNAZ were estimated using the nitrogen equivalent equation according to the experimental density. Results showed that the initial decomposition step of DNPDNAZ is the loss of NO2 from C2 and N1 is the point of molecular reactivity, D and P are 7364.42 m·s-1 and 23.75 GPa, respectively.
Analysis Structure and Composition of Egg Yolk
Authors: Wang Xin , Tong Qi Gen
Published: August 2014

In this paper, the structure and composition of the egg yolk has guiding effect to the quality problem of the egg yolk, processed foods. Yolks studies three levels, namely, the middle elastic layer, sand viscous layer, the outer layer. An analysis of the composition of the three levels as A result, in addition to vitamin A, egg yolk center among all kinds of trace elements content in the adhesive layer is egg yolk elastic layer and the external sand layer; At the same time, the egg yolk of external sandy layer in magnesium, iron, zinc and calcium content in the middle elastic layer; And constant composition of ash, the highest protein content of egg yolk center viscous layer, cholesterol, fat content of egg yolk highest elastic layer, middle carbohydrate content is the highest egg yolk of external sandy layer.
The Effect of MgO Precoating on the Perfomance of Ni/MgO-Al2O3 Catalysts for Carbon Dioxide Reforming of Methane
Authors: Huang Li Qiong , Zhang Zheng Hui , Guo Zhang Long
Published: August 2014

Ni catalysts supported on γ-Al2O3 supports modified by different MgO precoating weight were prepared by impregnation method. The surface area, pore diameter and Ni crystallite size were investigated by N2 adsorption/desorption (BET) and X-ray diffraction (XRD) methods. The reducing temperature and quantity information of reducible nickel species were obtained by H2-TPR experiments. The CO2 adsorption/desorption abilities of catalysts were investigated and the activity of catalysts were also measured. The coke resistance performance of catalysts for carbon dioxide reforming of methane (CDRM) was studied by CO2 temperature programmed surface reaction (CO2-TPSR). H2-TPR results revealed that there were three kinds of Ni species on the supports. Appropriate modification amount of MgO could increase the surface nickel active sites which could be easily reduced and prevented the formation of NiAl2O4 spinel species. CO2-TPD indicated that the addition of MgO increased the amount of CO2 adsorption at lower temperatures. N2 adsorption/desorption results disclosed that the excessive modification of MgO would decrease the surface area and pore size of the samples. The reforming reaction results showed that the activity was elevated from 58.62% to 65.95% over the Ni/MgO-Al2O3 when the Mg/Al ratio was 0.05 (wt.) and there was less coke evidenced by the CO2-TPSR results comparing to the Ni/γ-Al2O3 catalyst.
Black Liquor Treating of Wheat Straw Pulping Using Microwave Radiation
Authors: Cui Ming Xian , Song Wei
Published: August 2014

This paper describes the method of treating wheat straw pulp black liquor with microwave radiation. The granular activated carbon and CuO are used as a catalyst.Effects of effective factors such as the total amount, ratio, microwave power, time on treating process are studied. The reaction mechanism is also researched. The results indicate that the oxidative decomposition process of lignin or organic pollutants is combined action of activated carbon and CuO absorption-degradation with microwave induced oxidization. This approach is easy to operate, quickly to treat, completely to react and no new pollutants. So it is used to treat black liquor of containing organic pollutes which is hardly degraded.
The Adaptability in Polymer Flooding to GuoPu Oilfield of Childers - Jayne Childers
Authors: Liu Yin Feng , Song Da Zhao , Yao Yu , Fu Bi Yun
Published: August 2014

In view of the actual conditions of childers - jayne GuoPu reservoir with low temperature, high salinity , this text select three kinds of polymer by evaluating the related parameters of polymer which is resistant to high salinity to discuss the performance and adaptability.From the polymer viscosity-concentration relationship and viscosity-temperature relationship, it can be concluded that when the concentration of the HDSJ is 3000 mg/L, it can meet the requirements of the theory of reservoir viscosity values.However, due to the specific conditions of reservoir with high salinity (249060mg/L), the single polymer HDSJ cannot continue to maintain theory viscosity value.In view of the problems of polymer degradation at high salinity, those experiences join the mass fraction of chromium acetate 2.7% with retarder, to cross-linking in a single polymer solution based on 30:1 polymer chromium rate. By testing the stability of cross-linking system, we can conclude that HDSJ gel solution with polymer chromium ratio 30:1 can meet the reservoir conditions.
A 2D Irregular Shape Model of Random Packing for Cement Particles
Authors: Xie De Qing , Yang Yong Gan , Zhang Yun Sheng
Published: August 2014

In this paper, an area-oriented algorithm based on a cellular automaton (CA) is proposed firstly to generate random irregular particles in a special area. The algorithm is used to reconstruct a 2D image with numerous irregular particles, the particles information is extracted from a 2D original image reprocessed from a BSE image of Cement CCRL-133 (NIST, USA). To make it more comparable, a uniform size 2D image is reconstructed by random packing of circle cement particles. In addition, the influence of cement particle shapes (circle and irregular) on initial surface areas and pore size information of initial cement paste microstructure is presented. Comparative results demonstrate that the 2D image reconstructed by irregular particles generating from the new algorithm is consistent with the original one.
Determine the Average Particle Size of Silica Sol
Authors: Zheng Xue Ming , Duan Xiao Na , Sun Yang Yang , Shang Hui Jian
Published: August 2014

At present, the methods of analysising the average particle size of silica sol are the intuitive analysis, such as analysising the size distribution and morphology of the particle by the laser particle size instrument and the transmission electron microscopy. But some of the small particles tend to be ignored. Using the classical chemical titration method and BET to auxiliary analysis can make the date more complete. Through the comprehensive analysis with the four methods, found that longer reaction time have the effect of purification of sol system.
Numerical Investigation of Size Effect on Dry Friction Behavior in Micro Upsetting Process
Authors: Zheng Wei , Wang Guang Chun , Tang Bing Tao , Lin Xiao Juan , Sun Yan Zhi
Published: August 2014

After modifying the Wahime/Bay friction model, a new friction model suitable for micro-forming process without lubrication is established. In this model, it is shows that the friction coefficient is a function of strain hardening exponent, the normal pressure and the initial yield stress of material. Based on the experimental data, the micro-upsetting process is simulated using the proposed friction model. The simulation results are used to investigate the size effect on the dry friction behavior. It is found that the Coulomb’s friction coefficient is dropping with miniaturization of specimens when the amount of reduction is not too large.
Investigation on Micro-Structure Evolution of Mg-12Gd-3Y-0.5Zr Magnesium Alloy under High Velocity Impact
Authors: Yang Xiao Ming
Published: August 2014

Cubic-shaped specimens and hat-shaped specimens were used to investigate ASBs formed in Mg-12Gd-3Y-0.5Zr magnesium alloy under different initial strain rate impact. It shows that no adiabatic shear bands (ASBs) is observed in micro-structure of cubic-shaped specimens by scanning electron microscope (SEM) , but obvious ASBs can be observed in hat-shaped specimens. Johnson-Cook model based on thermoviscoplasticity constitutive relation was used to simulate internal stress distribution and fracture mode, and it indicated that the result of failure analysis from specimens under high velocity impact tests was the same as that obtained by computer simulation.
Properties of Indium Tin Oxide Films Prepared by Two-Targets Magnetron Sputtering
Authors: Chai Jian Guo
Published: August 2014

Indium tin oxide (ITO) films were deposited on glass substrates by magnetron sputtering. Properties of ITO films showed a dependence on substrate temperature. With an increasing in substrate temperature, the intensity of XRD peak increased and the grain size showed an evident increasing. The results show that increasing substrate temperature remarkably improves the characteristics of the films. The sheet resistance of 10 Ω/sq and the maximum optical transmittance of 90% in the visible range with optimized conditions can be achicved. The results of experiment demonstrate that high-quality films have been achieved by this technique.
Evaluation and Measured Analysis by FTIR of Fiber Insulation Materials Used in Inflatable Mini Cold Storage
Authors: Han Jiu Chun , Li Xi Hong , Wu Yan
Published: August 2014

Thermal insulation performance is a key factor in evaluation of thermal insulation materials. The chemical structure of polyester fiber, bamboo fiber and polylactic acid fiber was analyzed, and thermal insulation properties of the samples were investigated in terms of the measured transmittance of IR with before and after treated. The results showed that the measured transmittance of IR of corn fiber was lower than polyester fiber and bamboo fiber. In addition, the measured transmittance of bamboo fiber changed obviously, polyester fiber had small changes, polylactic acid fiber almost had no change. Moreover, the measured transmittance had an increasing trend. The heat preservation performance decreased after the samples were treated.
Molecular Weight and its Distribution of PET Depolymerization Residue under Microwave Irradiation
Authors: Zeng Cheng Cai , Tang Qing Hua , Zhong Ling , Liu Zhi De , Zhang Dong
Published: August 2014

The molecular chain of PET would be broken in the process of depolymerization reactions under microwave irradiation, which would lead to changes in molecular weight. In this paper, the molecular weight of PET residue measured by gel permeation chromatography (GPC) was used to track the progress of PET depolymerization. The results showed that the molecular weight of the residue after depolymerization under 180°Cdecreases as reaction time increases, however when the temperature of depolymerization was 190°Cor 200°C, with the reaction time increases, the molecular weight of residue decreased first and then increased slightly.
The Study of Nanolithography Processing on the Photoresistor Thin Film by Atomic Force Microscopy
Authors: Huang Jen Ching , Cheng Fu Jen
Published: August 2014

In this paper, the nanomachining experiments on the SPR3001 photoresistor thin films were processing by contact mode atomic force microscopy (AFM). After the experiment, it can be found, in the nanomachining, the greater the indented distance along the Z-axis depth, carved out of the groove depth and groove width of nanoline is greater. The influences of cutting directions on line width and cutting depth during nanomachining were quite a few and the cutting situation was stable by lateral nanomachining. This article also successfully processed the regular hexagonal nanopattern, also proves the nanomachining ability of the AFM probe is good at nanoscale patterned on photoresistor thin films.
Enhanced Absorption and Raman Scattering Signal in Cu2ZnSnS4 Film through Excitation of Surface Plasmon Polaritons
Authors: Zhang Jun Zhi , Fan Dong Hua , Xu Man Qin , Xu Shuai
Published: August 2014

We deposited silver on the surface of Cu2ZnSnS4 (CZTS) thin films by vacuum evaporation and then annealed it under vacuum condition. The surface-enhanced Raman scattering (SERS) is revealed by comparing Raman spectra of CZTS and CZTS-Ag films. The enhancement of the optical absorption is observed via investigating transmission spectrum. It is found that the CZTS-Ag film display a low transmittance, namely high absorption. Furthermore, X-ray diffraction and the optical band gap of samples show the pure CZTS phase with high crystal quality. The CZTS compound in CZTS-Ag films grow well and is not influenced by Ag nanoparticles.
Numerical Simulation of Flow Process of Ammonium Persulfate Crystallizer
Authors: Fan Yu Guang , Wei Ting
Published: August 2014

The method of computational fluid dynamics (CFD) is used to three-dimensional numerical simulation for the fluid flow process of ammonium persulfate crystallizer. By using standard model, this paper respectively simulated the flow field within the crystallizer in the impeller installation height of 1.2 m while stirring speed is of 60 r/min, 100 r/min and 200 r/min; and simulated the impact of the flow field inside the crystallizer when the stirring speed of 100 r/min and impeller installation height respectively is of 0.7 m, 1.2 m and 1.7 m. That calculation results show that: the velocity gradient is mainly concentrated in the area of internal draft tube and paddle around. With the increase of impeller speed, the flow velocity of the fluid within the crystallizer corresponding increases; and the energy also gradually decreases from mixing impeller to the settlement zone with the loss of the installation height, and the kinetic energy in the bottom of the crystallizer is reduced. Considering the energy and crystallization effect, selection of mixing speed of 100 r/min or so and installation height of about 1.2 m is more appropriate.
Microstructure and Properties of Longitudinal Submerged Arc Welded Linepipes for Deep-Sea Pipeline
Authors: Gao Ji Xiang , Li Lie Jun , Li Jian Feng , Wang Xiao Ning , Wei Shao Jun
Published: August 2014

This paper provides description of deep-sea JCOE process of longitudinal submerged-arc welded pipe.The test methods including optical microscopy and tensile,toughness,drop weight tear are applied, the microstructure and properties of deep-sea pipeline steel and deep longitudinal submerged arc welded pipe with thick wall are studied. The results indicates that pipeline steel of substrate organization to acicular ferrite mainly and deep with longitudinal submerged-arc welded thick wall pipe welding HAZ of rough crystal area and fine crystal area respectively main for granular bainite and associate polygon ferrite organization; Deep-sea LSAW steel pipe has reasonable control parameters for process, and its performance meets DNV-OS-F101:2007 specification and user project technology conditions,used for materiels of pipeline steel for China deep-sea oil and gas pipeline project.
Relationship between Diamond Particle Size and Thermal Conductivity of Cu-Diamond Composites
Authors: Dong Gui Xia , Liu Qiu Xiang , Dong Li , Li Shang Jie , Chen Hui
Published: August 2014

Diamond-copper composites were fabricated by ultrahigh pressure sintering (UHPS) technology. The influence of diamond particle size on the microstructure,relative density and thermal conductivity of composites were investigated. The results indicated that the high relative density of more than 99% diamond-copper composite can be prepared by UHPS method. The composite thermal conductivity dramatically increased with increasing diamond particle size and the highest value of 675W/(m·K) were obtained when using 200μm diamond,which is much higher than those of traditional electronic packing materials. The Cu-diamond composite could fulfill the requirement of heat removal of the high-power electronic packaging devices.
Effect of Fumed Silica and Zinc Borate on the Thermal Property of ABS/Magnesium Hydroxide Flame Retardant Composites
Authors: Cai Xiao Ping , Li Zhang Ting , Dai Pei Bang , Lu Yue Qun , Fan Li Li
Published: August 2014

Magnesium hydroxide (MH) has been used with polymers to make composites having flame retardancy as an environmental-friendly flame retardant. An attempt has been made in this direction, in order to enhance its flame retardant effectiveness. The synergistic effect of fumed silica (SiO2) and zinc borate (ZB) with MH in ABS based flame retardant composites was investigated with DSC. The endothermic effect of MH had little influence on the heat release reaction of ABS. The addition of ZB could not improve the thermal property of flame retarded ABS with MH. SiO2 or SiO2/ZB could significantly enhance the thermal property of the flame retarded ABS with MH based on the cooling effect of MH and the restraining effect of SiO2 or SiO2/ZB on the heat release reaction of SAN copolymer in ABS.
Preparation of Flaky Alumina Powder by Molten Salt Synthesis Method
Authors: Zhang Qian Ying , Geng Xun
Published: August 2014

High-quality flaky α-Al2O3 powder with regular morphology, uniform size, larger diameter-thickness proportion and excellent dispersibility in water and free from agglomeration and staggered growth was obtained on the basis of molten salt synthesis method. The effects of experiment parameter on the particle size and morphology of flaky alumina powder were studied. The mechanism of morphology control was discussed.
Synthesis, Structure Characterization and Photocatalytic Property of a Supramolecular Compound: [Co(en)3]2[H3PMo8V6O42]∙5H2O
Authors: Liu Ya Bing , Yu Peng
Published: August 2014

A new supramolecular compound, [Co (en)3]2[H3PMo8V6O42]∙5H2O (1) has been hydrothermally synthesized and structurally characterized by the elemental analysis, IR and single crystal X-ray diffraction. Compound 1 consists of [Co (en)2]2+ transition metal coordination fragment, [H3PMo8V6O42]4- building blocks and crystal water molecules, which are linked together via hydrogen-bonding interactions to form a new 3-D supramolecular networks. The degradation of methylene blue (MB) under UV-vis irradiation with 1 as the heterogeneous photocatalyst has been investigated, showing a good photocatalytic property of 1 for MB degradation.
The Effect of SiC Particle Size on the Microstructure and Hardness of SiCp/Cu Composites
Authors: Hu Ming , Tang Li Li , Shan Lin , Zhang Yun Long
Published: August 2014

The chemical plating technology was applied in order to improve the weaker wettability between the copper and SiC particles for electronic packaging applications. The hot-press sintering technique was executed to fabricate SiCp/Cu composites. The influence of SiC particles size on the phase constitute, micro-structure morphology and vickers hardness were investigated in details by means of X-ray diffraction, scanning electron microscope and vickers hardness tester. The results showed that SiC particle were distributed in copper matrix uniformly and interface was clear. The relative density and vickers hardness of SiCp/Cu composites increased as SiC particle size enhanced.
XFEM for Crack Propagation in Fiber-Reinforced Materials
Authors: Pang Yi Ling , Dai Duan Ming
Published: August 2014

This article describes the basic format of extended finite element method (XFEM), and simulation the crack propagation of fiber reinforced materials with extended finite element. Explore the number and elastic modulus of fibers influence the crack propagation by changing the elastic modulus and quantity of the fibers in matrix.
Influence of Additives Content on the Sintering Behavior of SiC Ceramics with Al2O3/La2O3 Aids
Authors: Zhang Yun Long , Zhang Yu Min , Hu Ming
Published: August 2014

In this paper, the rare-earth oxide Al2O3 combined with La2O3 served as sintering additives and commercial α-SiC powder were applied to fabricate SiC ceramics by pressure-less sintering technology. The results proved that combination of Al2O3 and La2O3 sintering additives was effective for densification of SiC ceramics. The influence of sintered additives content on the phase constitution, microstructure and sintering behavior of the SiC ceramics was detailed. The relative density, lose weight and volume shrinkage rate of SiC ceramics had similar evolvement trend with the increase of sintered aids content.
Keywords: Pressure-less Sintering, Mechanical Properties, Sintering Behavior
Effect of Solvent on Ethanolysis Reaction of Natrual Soybean Phosphatidylcholine
Authors: Zhang Tian Tian , Li Hong Ya , Zhou Hong Yu , Sun Hai Ling
Published: August 2014

The effect of solvents on ethanolysis of SPC was investigated. Heptane, cyclohexanethe, ether and MTBE were selected because of their satisfactory propertities. Under the certain reaction conditions, ether and MTBE have an higher conversion of SPC and yield of GPC than the other two because of their slightly higher polar and lower viscosity.
Preparation and Properties Research of Mesoporous Low-k Silica with Electric Field Induction
Authors: Chen Bai He , Zhang Jian Jun , Li Chun Yan , Cui Huan , He Zhi Wei
Published: August 2014

The preparation of mesoporous SiO2 with electric field (EF) induced different molecular templates method was reported. The effect of EF on the microstructure of the material has been investigated by scanning electron microscopy and static nitrogen adsorption analyzer. Results showed that the molecular regularly arranged by high voltage electrostatic field could effectively affect the porosity of the samples. The dielectric constant estimated from the Rayleigh and Lorentz-Lorenz classic models, was1.90.
Effect of Ar Annealing Temperature on SiO2/SiC: Carbon-Related Clusters Reduction Causing Interfacial Quality Improvement
Authors: Zhong Zhi Qin , Zheng Lu Da , Zhang Guo Jun , Wang Shu Ya , Dai Li Ping , Gong Ying Ling
Published: August 2014

The authors investigated the effects of annealing in Ar atmosphere at different temperatures (350 °C, 600 °C, and 900 °C) on the thermally oxidized SiO2 /4H-SiC interface. A strong correlation between C-related clusters reduction and SiO2/SiC interfacial improvement was observed. The C-related clusters, which were characterized by field-emission scanning electron microscopy, and energy-dispersive spectrometry, can be significantly reduced after annealing at moderate temperature (600 °C). This sample annealed at 600 °C exhibited the best interfacial quality of SiO2/SiC from capacitance–voltage measurement. Based on the studies, improvements in the quality of the SiO2/SiC interface after annealing at 600 °C may be explained by the reduction of C-related clusters during annealing.
Studies on Water Repellency of Super-Hydrophobic Surfaces
Authors: Yu Zhi Jia , Song Shan Peng , Li Yan Feng , Qin Fu Tao , Kuang Guo Zhu
Published: August 2014

Development of new material based on bionics has aroused researchers’interests in recent years. Function surfaces could found their application in many areas. Characteristics of super-hydrophobic surfaces were studied in some aspects experimentally, such as the droplet’s behavior on the super-hydrophobic surface, the effects of the organic compound content in water on wettability of the surface, the super hydrophobicity and super oleophilicity and the phase transformation process on the super-hydrophobic surface. It is shown that the super-hydrophobic surfaces have the characters of no-droplet adherence, oleophilic and dropwise condensation. Applications are expected in industries and daily life with those characters.
Deep Level Centers in Carbon-Doped High Resistivity GaN
Authors: Cui Huan , Lu Li Wu , Sang Ling , Chen Bai He , He Zhi Wei , Shen Bo , Yang Xue Lin
Published: August 2014

The deep levels of carbon doped high resistivity (HR) GaN samples grown by metal-organic chemical vapor deposition (MOCVD) has been investigated using thermally stimulated current (TSC) spectroscopy and high temperature (HT) Hall measurement. Two different thickness of 100 and 300 nm were used to be compared. It was found that four distinct deep levels by TSC and one deep level by HT Hall measurement were observed in both samples, which means great help for the decrease of leakage current and lifetime limitations of device utilizing the structure. The activation energy of these levels was calculated and their possible origins were also proposed. The low temperature traps, might be related to VN, 0.50 and 0.52eV related to incorporate a high level carbon, 0.57eV related to VGa, 0.59eV related to CGa or NGa, 0.91 and 0.97eV related to interstitial N1 .
An Experimental Study of Pig Blood–Lime Mortar Used on Ancient Architecture in China
Authors: Zhao Peng , Xie De Qing , Li Guang Yan , Zhang Yun Sheng
Published: August 2014

Portland cement has low chemical and physical affinity for traditional building materials. This hinders the restoration of historical buildings and modern rustic architecture where blue bricks are used. Pig blood–lime mortar is one of the most important technological inventions in the Chinese architectural history. Mortar in this work was fabricated according to formulas of the literature, and some analyses were conducted for further understanding their microstructure. Environmental scanning electron microscopy was utilized to analyze mechanism of interaction between key components of ancient mortar bonding materials. Results show that pig blood accelerates the formation of microstructure at early stage. Pig blood plays the role of biological templates which regulates the growth of calcium carbonate crystal.
450°C Stress Rupture Properties of a Non-Quenched and Tempered Steel MFT8
Authors: Wang Jue , Wang Zhang Zhong , Zhang Meng Jiao , Zhao Sui Chun , Shang Xiao Juan
Published: August 2014

The thermal strength properties of a non-quenched and tempered steel, MFT8 were investigated by stress rupture tests at 450°C. High-temperature tensile tests were also carried out to determine the stress range for the accelerated creep experiments. Optical microscope (OM) and scanning electron microscope (SEM) were used to analyze the fractography and microstructure evolution. The results showed that MFT8 steels exhibited transgranular fracture and high ductility in the stress rupture tests. Although the creep cavities were observed, the critical reason of creep rupture was the wedge cracks caused by stress concentration in the area of carbide fragments. The rupture life of MFT8 at 450°C/ 100000 hours was calculated to be 184.4MPa by linear extrapolation. The data of this study inferred that MFT8 had the potential to substitute for the quenched and tempered steels of the same class in power industry.
The Basic Investigation on Catalytic Oxidation of Mine Gas to Methanol in Liquid Phase
Authors: Xu Feng , Li Chuang , Jia Shao Yang
Published: August 2014

A set of experimental system was self-designed and made for liquid phase catalytic oxidation of gas to methanol. It was used to investigate the impacts of catalyst and reaction conditions on catalytic oxidation of gas to methanol in acetic acid solution, and to analyze its reaction mechanism. It has been showed that the yield of the methanol is 1840 μmol under the catalysis of 0.5 g of 0.5% Pd-CuPc/Y and the following conditions: CH3COOH:H2O = 4:1 (v/v), 1000 μmol of p-benzoquinone; reaction time, 3 h; reaction temperature, 150°C; gas composition, 2.5MPa CH4+0.4MPaO2 +0.4MPa N2; in acetic acid solution, catalytic oxidation of mine gas to methanol follows mechanisms of electrophilic substitution and oxidation of reactive oxygen species (ROS).
A Novel Technology of Molybdenum Extraction from Ni-Mo Alloy
Authors: Song Qiong , Huo Guang Sheng , Cao Can
Published: August 2014

The recovery of molybdenum from Ni-Mo alloy was investigated by acid oxidation leaching in H2SO4-NaClO3 system and then ion exchange process of leach liquor. The results in the leaching tests show that the leaching rates of nickel, molybdenum and iron are 99%, 97% and 98% respectively under the optimum conditions of H2SO4 dosage of 0.24mol per 20g Ni-Mo alloy, mass ratio of NaClO3/Ni-Mo alloy of 1.0, liquid-solid ratio of 4:1, leaching temperature of 100oC and time of 4h. The extraction of molybdenum in leach liquor was studied by ion exchange. The test results of resins selection show that the D308 resin is the best among resins on molybdenum adsorption. The results from the column tests of the D308 resin indicate that the mass ratio of Ni/Mo in effluent reaches to 10.84 from initial ratio of 0.607 and the adsorption rate of molybdenum is 94.4%.
Analysis of Large Inclusions in Q195 Steel
Authors: Wang Shuo Ming , Wang Yan , Wang Ruo Si
Published: August 2014

Aimed at the Q195 steel strip inclusion defects in a steel mill, using tracer analysis make system analysis to casting of large inclusions content. Large inclusions in casting containing ladle slag accounted for about 39% of the total number of test, containing tundish covering agent accounts for about 42.2%, while containing protection slag accounted for 45%. Shows that large inclusions in the billet is mainly comes from the crystallizer mold powder entrapment, secondly is the tundish slag and the ladle slag powder entrapment. When transient casting large inclusions content is steady casting several times, increasing the stability of operation on transient casting, controlling the stability of cast-on and ladle changing, stabilizing the liquid level of tundish and mould can improve the quality of the steel.
Dynamic Simulation Model of 300MW Oxy-Combustion of Pulverized Coal Boiler
Authors: Gao Jian Qiang , Wang Li Kun , Wang Yu Lan , Shen Liang Jie
Published: August 2014

With the conceptual design 300MW oxy-combustion of pulverized coal boiler for the study, according to its working principle, we divide the whole boiler into several subsystems, and complete the dynamic and static simulation model based on the IMMS platform. The results show that, the established model is stable, the trend of the dynamic characteristics is reasonable, and the error is within the permissible range, which provides a reference for the simulation of the oxy-combustion of pulverized coal boiler as a whole.
Fluidization Properties and Mixing Properties of Binary Mixtures of Quartz Sand and Coal Char in Fluidized Bed
Authors: Zhao Xin Jun , Eri Qi Tai , Wang Qiang
Published: August 2014

To study the fluidization properties and mixing properties of binary mixtures of quartz sand and coal char, the experiments were carried out in fluidized bed with an inner diameter of 50 mm. The pressure drop lines and mixing index were obtained under different operating conditions with changing the static bed height and the volume fraction of coal char. A new formula of mixing index was proposed to consider the difference of horizontal mixing behavior. The result showed that the static bed height does not make an appreciable influence to minimum fluidization velocity and fluidization status. However, the volume fraction of coal char affected the minimum fluidization velocity obviously, and the minimum fluidization velocity decreased monotonously with decreasing the volume fraction. Although the small volume fraction of coal char was good for mixing, the effect was limited by the height of bed and the mixing index becomes constant almost at 80mm static bed height when the volume fraction was less than 0.4.
Microstructure and Wear Properties of Fe-Based Alloy Coating
Authors: Chen Bo , Li Yi , Tang Cai , Fan Hui Ji , Zhu Peng Xiao
Published: August 2014

Fe-based alloy coatings were produced by the plasma transferred arc(PTA) at arc current values of 90A,100A,110A and 120A. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and optical microscopy (OM) were used to characterize the microstructure of the coatings. The wear resistances of the coatings were tested by impact and wear experiment. The results show that, the coating and substrate are metallurgy combination, and the coating modified at 110A shows that better wear resistance than others.
Microstructure Transition during Rapid Solidification of Liquid Metal Zn
Authors: Peng You Lin , Zhou Li Li , Chen Lan Zhen
Published: August 2014

A molecular dynamics simulation study has been performed for a system consisting of 10,000 atoms to investigate the microstructure evolutions during the rapid solidification. Results indicate that the crystallization has not enough time to complete due to the high cooling rate; therefore, a part of crystal structure is formed, in which the hcp and fcc basic clusters and some other metallic type clusters coexist in the final solidified structure.
Recovery Pb, Zn and S from a Chinese Lead-Zinc Mine Beneficiation Plant Tailing
Authors: Chen Yong , Song Yong Sheng , Zhou Gui Ying , Li Wen Juan
Published: August 2014

Detailed characterisation and recovery of galena, sphalerite, and pyrrhotite from the beneficiation plant tailing of YouXi, China, was investigated. Different characterisation techniques viz. size analysis, chemical analysis, mineral analysis by Mineral Liberation Analyser（MLA）were carried out. Based on the appreciable differences in specific gravity, floatability and magnetic susceptibility between the desired lead, zinc, sulphur minerals and the gangue minerals, the flow sheets comprising desliming, flotation and magnetic separation, was used to recover galena, sphalerite, and pyrrhotite values. A lead and zinc concentrate of Pb 16.02%, Zn 35.1% and sulphur concentrate assays 35% S and 56% Fe can be produced from the tailing.
Research on Kinetics Behavior of Nitrogen Gas Absorption in Fe-Cr-Mn(Mo) Alloy
Authors: Zhang Shu Cai , Zhu Hong Chun , Zhang Jiang Tao , Li Ke Bin , Mi Zhi Shan , Li Hua Bing , Jiang Zhou Hua , Zhang Wei
Published: August 2014

The kinetics of nitrogen absorption in Fe-Cr-Mn (Mo) alloys under 0.1 MPa nitrogen pressure and 1873K was investigated by top blowing nitrogen gas into the steel melts. A thermodynamic model of nitrogen solubility was established. Also the effect of surface active elements oxygen and sulfur on nitrogen absorption was studied. The results show that Fe-Cr-Mn (Mo) melts achieve nitrogen saturation value within 50 minutes, the nitrogen solubility increases with the content of chromium and manganese, but the experiment values of nitrogen solubility are general lower than theoretical values because of the open nitrogen gas atmosphere and high surface active elements content in the steel melts. The nitrogen absorption can be described well by a second order reaction and the interfacial reaction is restrictive step. The rate of nitrogen absorption decreases by lowering the surface reaction constant due to oxygen and sulfur in the steel melts. The effect of the surface active elements oxygen and sulfur on nitrogen absorption can be described well as .
Security Analysis on Single-Screw Extrusion Process of Solid Propellant by Numerical Simulation
Authors: He Zhong Qi , Zhou Ke , Yin Shu Pan
Published: August 2014

Solid propellants are flammable, explosive, which maybe initiated unexpectedly under specific excitation conditions through high-speed screwing. Though single-screw extrusion process for solid propellant occurred a large proportion accidents, the rheological parameters of the propellant material were difficult to get yet, which affects the process safety greatly. In this paper, the CFD software, POLYFLOW, and a numerical simulation method were adopted to investigate the rheological parameters in single-screw extrusion process of solid propellant. By analyzing the rheological state of a solid propellant in the screw extrusion process, the applicable numerical model was established with a substitute material for the propellant. As a result, distributions of key parameters, such as material temperature, pressure, viscosity, were obtained. The simulation shows that the material has relatively higher pressure, temperature and smaller viscosity at the screw edge, where solid propellant components were mixing and plasticizing severely, also where needs pay much attention to for safety reasons.
Study on Mechanical Properties at High Temperatures and Microstructure of Mg-12Gd-3Y-0.5Zr Magnesium Alloy
Authors: Cao Tian Dong , Yang Xiao Ming
Published: August 2014

In this paper, tensile tests were carried out on the as-rolled and heat-treated Mg-12Gd-3Y-0.5Zr magnesium alloy at different temperatures. Tendency of tensile strength vs temperature was investigated and strengthening mechanism was discussed. It shows that both as-rolled and heat-treated Mg-12Gd-3Y-0.5Zr magnesium alloy have good mechanical properties at high temperatures. The reason why they have poor tension-compression asymmetry was discussed by their texture analysis. It is indicated that solution strengthening and precipitation strengthening were main strengthening mechanisam, and RE additons improve their thermal stability which lead to their high tensile strength at high temperatures.
Biooxidation of High-Sulfur Refractory Gold Concentrate by Ferroplasma acidiphilum
Authors: Shang He , Wen Jian Kang , Wu Biao
Published: August 2014

Gold ores can be categorized into two types-free milling and refractory. Free milling ores are easy to treat. Gold in such ores is recovered by gravity separating techniques or direct cyanidation. Refractory gold ores, on the contrary, are difficult to treat and require pre-treatment prior to cyanidation, such as roasting, pressure oxidation, fine grinding and biooxidation. A number of bacteria are used in biomining but the prominent ones that are known to be involved in the oxidation of sulfide ores include Thiobacillusferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans. In this study, the gold concentrate was biooxidized in a reactor at 45°C over a period of 10 days at a pulp density of 15% solids using a culture of already grown Ferroplasma acidiphilum. The initial pH was adjusted to 1.5 with sulfuric acid, resulted in 85.39 % oxidation of sulfur from initial grade of 33.83 %, and the slag rate was 68.52 %. The products of sulfide biooxidation were leached at a pulp density of 20 %(v/w) for 24 h at pH 11. The pH was adjusted using CaO and cyanide strength was 10 kg/t, we got a gold extraction of 90.71 %, which ncreaseed 80.09 % compared with the direct cyanide leaching.
DSC Study of Recrystallization in Wiredrawn Industrial Copper
Authors: Fellah Lahcene , Boumerzoug Zakaria
Published: August 2014

The goal of this work is to investigate the recrystallization reaction in cold wiredrawn industrial copper. We have used a differential scanning calorimetry and X-ray Diffraction techniques. The stored and apparent activation energies have been determined by differential scanning calorimetry under isochronal conditions. The differential scanning calorimetry results have been analyzed using models developed by Kissinger, Ozawa, Boswell, and Starink. In addition, the transformed fraction, as a function of temperature, and some kinetic parameters have been determined. We have found that cold wiredrawn affects some microstructure proprieties of the material, such the increase of stored and apparent activation energies, and dislocation density after deformation.
Study on the Dephosphorization of Semi-Steel in Ladle
Authors: Han Yong Hui , Bai Rui Guo , Cang Da Qing , Liu Fu Hai , Gao Hai
Published: August 2014

Combined with converter semi-steel component of Chengde steel plant, the main components of 100t ladle dephosphorization slag were calculated to propose the initial ratio of dephosphorization slag composition. The dephosphorization slag composition was then further improved by induction furnace dephosphorization. Analysis of dephosphorization rules has been done. The results show that: the dephosphorization effect reaches the best when the percent content of CaO is 35%, the amount of slag is 20kg/t, oxygen flow rate is 4L/min, oxygen blowing time is 4min, and dephosphorization efficiency can reach 56.9%; the order of the elements influencing dephosphorization rate is as follows: oxygen flow rate > slag > CaO > oxygen blowing time. From the experiment, dephosphorization in the ladle can reach the expected effect, which is the new method of hot metal pre-dephosphorization for iron and steel plant using vanadium titanium magnetite.
Thermal Stress Development in Steam-Side Oxide Scales in High Temperature Components of Boilers under Thermal Shock
Authors: Bian Cai Xia , Zhou Ke Yi , Zhu Zheng Lin , Bi Xiao Long
Published: August 2014

Failure of steam-side oxide scales in high temperature components of boilers such as superheater and reheater tubes has significant effect on the safety of thermal power plants. Finite element analysis is carried out to investigate the failure issues of steam-side oxide scales in boiler tubes during thermal shock processes. The effects of different steam temperature variation durations on oxide scale failure issues have been analyzed. According to the results, appropriately lengthening variation duration can contribute to relieving oxide scale failure issues, and are subsequently proposed.
A New Model of Non-Parametric Estimation for Short Term Wind Power Prediction
Authors: Chen Qin Qin , Chen Guo Chu , Ding Guo Dong
Published: August 2014

This article propose a new non-parametric interval estimation model, and give the concept of lateral error and vertical error based on traditional non-parametric interval estimation model, on this basis, a probability prediction model of error in the joint condition of horizontal and vertical distribution is established. The new model has been proved to have a better rationality through simulation, risk assessment also has better value.