bluuebunny/crossref_metadata_2025 huggingface dataset:
Ab Initio Study the Transport Properties of Alumium-Phosphorus Dopped Si Atomic Nanowire
Authors: Peng You Lin , Zhou Yan Hong , Zhou Li Li
Published: December 2011

We perform first-principles calculation of the transport properties of alumium-phosphorus dopped Si atomic nanowire coupled to two Al(100) nanoscale electrodes using the non-equilibrium Green formalism combined with the density-functional theory. In particular, the alumium-phosphorus dopped silicon wire with seven atoms sandwiched between the Al(100) electrodes is considered. It is found that the transport properties are sensitive to the dopping position of the alumium and the phosphorus on the silicon wire. The equilibrium conductance of the pure silicon wire is rather big, close to 3 G0, Three eigenchannels which contribute to the equilibrium conductance are fully open. All cases of the alumium-phosphorus dopping reduce the conductivity of the pure silicon wire. In particular, the conductance of the wire decreases to 0.7 G0 when a phosphorus substitutes the third silicon atom and a alumium substitutes the sixed silicon atom. The current-voltage(I-V) curves of these cases vary dramatically. The current across the wire with a phosphorus substitutes the third silicon atom and a alumium substitutes the sixed silicon atom is rather smaller than the that across the pure silicon. A detailed analysis of the transmission coefficient of the eigenchannels, the projected density of states are made to reveal the mechanism of the differences.
Research on Chloride Leaching of Cu, Zn and Ag from Flotation Tailings
Authors: Lu Dian Kun , Shi Li Fang , Jin Zhe Nan
Published: December 2011

Mineralogical examinations of Asheler copper mine flotation tailings have been carried out. Results show that the major metal sulphide minerals are pyrite and the main gangue constituents are quartz, chlorite-serpentine and muscovite. The main valuable metals are Cu, Zn and Ag. Basic mineral compositions of copper and zinc have been identified through chemical phase analysis. On the basis of mineralogical examinations, leaching test has been carried out in about 240g/l NaCl solution. The optimum conditions for leaching are found as follows: temperature at 86°C, pulp concentration is 24.19%wt, [Cu2+] =19.22g/l, [HCl] initial =0.17mol/L. Under these conditions, chloride leaching can extract 83.35%Cu, 92.10%Zn, and 85.26%Ag after 8 hours leaching.
Effect of Bismuth on the Microstructure and Corrosion Resistance of Galvanized Coating
Authors: Wang Jian Hua , Wang Xing Ming , Liu Chun Mei , Su Xu Ping , Wu Chang Jun , Liu Ya , Tu Hao
Published: December 2011

The microstructure of the galvanized coating was investigated using scanning electron microscope equipped with energy dispersive X-ray spectroscope. The immersing and electrochemical corrosion tests were carried out to study the corrosion resistance of the galvanized coating. The addition of Bi in Zn-bath affects remarkably the morphology of the galvanized coating. The thickness of δ + ζ phase layer in the coating reaches the maximum when the content of Bi in Zn-bath is 0.5 wt.%. The corrosion resistance of the galvanized coating declines with the increase of the content of Bi.
Effect of Different Initiator Systems on Graft Copolymerization of Cellulose Fiber with Caprolactam
Authors: Xiu Hui Juan , Han Qing , Wang Li Jun , Zhang Ru
Published: December 2011

Effects of commonly used initiator systems of grafting copolymerization on pulp fiber with caprolactam were studied in this paper. The systems were listed as below: potassium persulphate-sodium bisulfite, cerium nitrate amine, potassium permanganate, hydrogen peroxide-ferrous sulfate and benzoyl peroxide. According the grafting ratio as the main parameter, the optimal initiator system was used in the grafting copolymerization of cellulose fiber with caprolactam, which was picked under the same conditions including the same monomer concentration, the same temperature and the same reaction time. The results showed that it can obtain a higher grafting ratio at low temperature, and low reaction activation energy with a faster reaction rate in the oxido-reduction system (K2S2O8-NaHSO3). And the reactant could expand in a short time. The K2S2O8-NaHSO3 initiator system is higher in graft ratio, rapid in speed and low in cost.
Effect of Chloride on Corrosion Behavior of Reinforcing Steel HRB335
Authors: Li Ping , Wang Ying
Published: December 2011

The corrosion behavior of reinforcing steel HRB335 in structure in simulated concrete solution (0.5 wt.% NaCl solution) was investigated, and its tensile mechanical properties were tested before and after corrosion. The results show that, with the increase of corrosion time from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, and the composition amounts of corrosion scale are not familiar. After 720h, the yield strength is decreased by about 3%, and the tensile strength and the elongation are decreased by more than 4%.
Effects of Y3+-Doping on the Electrochemical Properties of LiV3O8 Cathode Material Prepared by a Solid-State Method
Authors: Liu Yong Mei , Li Hui Juan , Ni Jie
Published: December 2011

A series of yttrium-doped lithium trivanadates LiV3-yYyO8 (y=0, 0.01, 0.03, 0.05, 0.1 and 0.2) were synthesized by a solid-state reaction. X-ray diffraction (XRD) tests show that a proper amount of yttrium doping in LiV3O8 can modify its structure. Charge-discharge tests show that doped samples with a proper amount of yttrium display good cycling stability compared with undoped sample. The cyclic voltammetry (CV) tests indicate that the proper amount of yttrium doping in LiV3O8 can stabilize its original structure. Yttrium doping is a convenient and effective method for improving the electrochemical performances of LiV3O8.
Structures, Theoretical Vibrational Frequency and 1H-NMR Spectral Analysis of Pyrazine-Dibenzylsulfoxide Platinum(II) Complexes
Authors: Wu Zheng Ping , Butler Ian S.
Published: December 2011

Mixed-ligand Pt(II) complexes containing pyrazine (C4N2H4, pz) and dibenzyl sulfoxide [C6H5CH2)2SO, DBzSO] ligands have been studied using density functional theory (DFT) methods with a particular emphasis on the theoretical1H-NMR spectra of the methylene protons. The DFT optimization calculations on Pt(DBzSO)Cl2(pz) and {Pt(DBzSO)Cl2}2(pz) predicted the structure parameters, vibrational frequency and1H-NMR spectra. Different structures of DBzSO will affect the bond lengths and angles in the complexes, except for the pz ligands. The [shift(Pt(II)complex)-shift(sulfoxide)] values of trans-Pt(DBzSO)(pz)Cl2were smaller than those for cis-Pt(DBzSO)(pz)Cl2and the calculation results appear to be reasonable. The1H-NMR spectra of the methylene protons of cis- and trans-{Pt(DBzSO)Cl2}2(pz) indicate that these two structures have high symmetry.
Ambient Condition Synthesis of Ag Submicron Crystallites from AgNO3, H2O2 and NH3•H2O
Authors: Li Jing , Zhang Yong Cai
Published: December 2011

A simple and cost-effective method based on the reduction of AgNO3 by H2O2 (5 vol.%) in 2.5–5 vol.% NH3•H2O aqueous solutions at room temperature and under atmospheric pressure was developed for the synthesis of Ag submicron crystallites. X-ray diffraction patterns demonstrated that the resultant products were pure cubic phase Ag powders. Field emission scanning electronic microscopy images showed that the Ag powders synthesized in 2.5 and 5 vol.% NH3•H2O aqueous solutions comprised submicron crystallites with the sizes of about 355–580 and 200–650 nm, respectively. Besides, the possible formation mechanism of Ag powders in the present system was also proposed.
Selectivity Patterns of Radical Reactions in 1-Hexene Pyrolysis
Authors: Zhao Ying Xian
Published: December 2011

The pyrolysis of 1-hexene at 873 K was investigated. Primary products include C1-C4 paraffins, C2-C4 olefins, butadiene, pentadiene, cyclopentane, cyclopentene, coke and hydrogen. A chain reaction mechanism was developed to interpret the distribution of products, and the quantitative analysis on the selectivity patterns of radical reactions was presented.
Self-Assembly of 4-Vinylbenzoic Acid Layer on the Magnetic Nanoparticles and In Situ Polymerization
Authors: Zhong Guo Lun , Bi Ru Yi , Mao Hong Lei , Wang Yong Hong , Xu Jin Bao
Published: December 2011

A new method for fabrication of core-shell functional polymer coated nanoparticles was proposed in this work. At first the magnetite particles were wrapped with single-layer oleic acid for getting a hydrophobic surface. Then the monomer molecules of 4-vinylbenzoic acid were fabricated onto this layer by self-assembly and finally in-situ polymerization was taken place for obtaining the functional polymer coated nanoparticles with –COOH groups outside. The nanoparticles were characterized by FTIR, TEM, magnetic property, etc. The results showed that the size of the particle was less than 20 nm in diameter and had a very good property of superparamagnetism.
Investigation on the Co-Combustion Characteristics of Textile Dyeing Sludge and Sawdust
Authors: Wei Pei Tao , Ning Xu Nan , Zhou Yun , Liu Jing Yong , Yu Jun
Published: December 2011

The combustion characteristics of textile dyeing sludge，sawdust and its blends at different proportions were studied by thermogravimetric analysis(TG-DTG) at different heating rates. The results showed that there existed four obviously temperature zones during the textile dyeing sludge combustion curves, which were corresponding to moisture's exhalation、two stages of devolatilizations and fixed carbon combustion. With the increasing of heating rates, the burning time was shorten and the combustion rate was faster of the textile dying sludge. DTG curve of the blends was more closed to that of the larger proportions. Comprehensive combustion characteristic index SN of the sludge-sawdust blends showed an uptrend, which demonstrated that higher volatility had better combustion characteristics.
Intelligent Operation Control for the Fused Magnesia Production
Authors: Wu Yong Jian , Zhou Ping , Shang Pin , Chai Tian You
Published: December 2011

An electro-fused magnesia furnace (EFMF) is used to produce electro-fused magnesia. Due to the complex dynamic characteristics of the EFMF production process, it is difficult to achieve the satisfactory control performances only by the independent conventional control method. As a result, the lower loop control with manual operations is still widely used in practice. However, the manual operation cannot ensure that the actual production qualities and the energy consumption of unit production meet the technical requirements all the time. In this paper, an intelligent operation control strategy is developed for the EFMF to automatically adjust the setpoints of the lower level control system. Based on the proposed intelligent control strategy, an intelligent control system for the EFMF is built and implemented on site. Industrial application has demonstrated that the intelligent control system can achieve reliable, accurate and timely control performances.
Preparation of High-Performance Brick from Construction and Demolition Waste
Authors: Liu Hong Jie , Li Pei Xin , Cao Su Gai , Zhao Feng Qing
Published: December 2011

Recycled aggregate prepared from construction and demolition waste (C&DW) through sorting, crushing and screening process was mixed with an eco-cement (mainly from high calcium fly ash, granulated blast-furnace slag and clinker), antifreeze additives and water, forming high-performance load bearing brick. The product prepared conforms to GB/T21144-2007 (Concrete Solid Brick, China National Standards) with excellent freeze-thaw resistance and high strength. The effects of water-solid ratio and cementing material content on the performance of the product were investigated.
Preparation of Flame-Retardant Asphalt for Tunnels
Authors: Tian Bin , Li Rui , Wang Dong
Published: December 2011

The manufacturing cost of asphalt flame retardant is very expensive since it mostly comprises halogen, stibonium and boron composite system. As a result, its use is restricted. In this paper, three kinds of cheap phosphorus, nitrogen flame retardants and two kinds of inorganic flame retardants for modifying asphalt. Based on limit oxygen index, the effect of one-component and multicomponent flame retardant on asphalt flame-retardant performance was analyzed. Moreover, in phosphorus-nitrogen-aluminum and phosphorus-phosphorus-aluminum flame-retardant experiments, it was found that phosphorus-aluminum composite system also has good flame-retardant effects, and the optimal proportion was obtained. The experiments validated that its flame-retardant performance can reach difficult flammable level-2 standard, fully satisfying the use need of tunnel surface, and substantially reducing the technical-economic cost of flame-retardant asphalt. FRC index proposed in this paper takes into full consideration the flame-retardant performance and economic cost for modification of asphalt, and provides important reference to the selection of master plan.
Strontium Modification of Biomaterial: The Effective Approach to Enhance the Bioactivity and Biocompatibility of Calcium Silicate
Authors: Zhang Wei Bin , Liu Wai Ching , Gu Wei Ming , Chen Lei , Shen Yu Hui
Published: December 2011

Calcium silicate (CS), the recent developed biodegradable ceramic, shows potential in stimulating bone regeneration. However, the rapid degradation restricts its further application, that is, the cytotoxicity is highly suspicious. In this study, the attempt with the addition of strontium by partially replacing the site of calcium shows appropriate, not only enhancing the bioactivity of CS, but also promoting its biocompatibility. Thus, the modification of biomaterial by strontium seems to be an effective approach for biological application.
Preparation and Thermal Properties of Novolac Resin/Graphite Nanosheet Composites
Authors: Cao Peng , Qi Shu Hua , Li Sha Sha
Published: December 2011

In this study, a high thermal conductivity novolac resin /graphite nanosheet composite have been prepared via in situ polymerization at the presence of sonicated expanded graphite. Graphite nanosheets prepared via powering the expanded graphite had a thickness ranging 10~100 nm and a diameter range 5~10μm and were excellent nanofiller for the fabrication of polymer/graphite nanocomposite. Scanning election microscopy was used to characterize the structure and dispersion of the graphite nanosheets and the composites. The results showed that the structure of the nanosheets played an important role in forming thermal conducting network in the novolac resin matrix.
Influences of Hot Rolling Conditions on the Microstructure and Mechanical Properties of Low-Alloy Steel
Authors: Sun Hai Shen , Li Guo Ping , Chen Wen
Published: December 2011

The thermomechanical control processing (TMCP) was conducted through the adjustment of the rolling technological parameters to the test steel. The influence of the finishing temperature, cooling rate and alloying elements to the microstructure and mechanical properties was investigated by comprehensive utilization of grain refining strengthening and second phase strengthening.The results show that the microstructure was mainly composed of bainite, ferrite and second phase TiC; at the finishing temperature of 870°C, the yield strength was 596.7 MPa, the tensile strength reached 748.5 MPa, the elongation ratio was 20.17%; at high cooling rate of 16°C/s, the yield strength achieved 616.7 MPa, the tensile strength reached 785.5 MPa, the tensile ratio reduced for 0.78, and the elongation ratio enhanced to 20.92%. And the quantity of bainite increased with the raise of finishing temperature from 800°C to 870°C, which improved the hardness and wear resistance of the steel.
Light Absorption Enhancement in Single Si(Core)/SiO2(Shell) Coaxial Nanowires for Photovoltaic Applications
Authors: Liu Wen Fu , Sun Fu Zhao
Published: December 2011

We have carried out detailed investigations into the light absorption in single Si (core)/SiO2 (shell) coaxial nanowires (NWs) within the framework of the Lorenz-Mie light scattering theory. We have found that the light absorption in single coaxial NWs can be significantly enhanced as compared to in Si NWs, due to SiO2 shells. We have also found that the photocurrent can be enhanced up to ~56% for the coaxial NW of the core radius of 150 nm by tuning the shell thickness.
Preparation of TiO2 Nanometer Thin Film Deposited on Organic Templates by a Layer-by-Layer Self-Assembly Method
Authors: Mu Wen Ning , Shi Shuang Zhi , Yang Xiu Yu
Published: December 2011

Thin organic layer-by-layer self-assembly films with negatively charged surface were prepared, which used as templates for the deposition of TiO2on Si substrate by hydrolysis of titanate solution in acid environment. The as-deposited thin films were fully amorphous from the result of XRD, also were homogeneous and continuous produced at 80 °C for 2 h as presented in SEM images. The thickness of thin films grew with deposition time gradually and reached 300 nm after 12 h immersion.
Effect of TMCP Parameters on the Microstructure and Properties of the API X60 Pipeline Steels
Authors: Mu Wen Ning , Shi Shuang Zhi
Published: December 2011

Effects of technological parameters of thermo mechanical control process (TMCP) on microstructure and mechanical properties of the API X60 pipeline steels have been investigated. The parameters of TMCP for obtaining better mechanical properties are given. The experimental results show that the mixed microstructure mostly composed of polygonal ferrite, pearlite/bainite and martensite-austenite constituent (M-A) has the optimum strength and ductility.
Preparation and Properties of C2AS-CAS2 Composite Pavement Bricks
Authors: Chai Yue Sheng , Bai Pin Bo , Liu Zheng Guan , Feng Fu Rong , Qiu Yan , Gong Chang Wei , Tian Yu Ming
Published: December 2011

o make full use of magnesium slags, the C2AS-CAS2 composite pavement bricks were sintered by using magnesium slags, kaolin and Al2O3 at normal pressure. The phases, microscopy, size deviation, compressive strength and anti-hydration property of samples were analyzed using XRD, FE-SEM, EDS, mechanical testing and others techniques. The results show that the main phases of the samples are C2AS and CAS2; the transverse contraction is 3.5%, while the longitudinal shrinkage is 4.2%; the compressive strength is up to 65.3Mpa; the samples have well anti-hydration property. The C2AS-CAS2 composite pavement bricks have excellent properties.
Optimization of Process Parameters of Hot-Dip Aluminized Coating
Authors: Chen Jiang , Dai Guang Ze , Zhao Jun Wen , Huang Xing Min , Han Jing
Published: December 2011

The hot-dip aluminized process parameters with respect to the thickness and microstructure of intermetalic layer were investigated using a uniform design of experiments. The measured thickness of intermetalic layer was regressed as first- to third-order polynomial equations of four related parameters, i.e. hot-dip temperature, hot-dip time, diffusion treatment temperature and diffusion treatment time. It was found that the third-order regressed equation was acceptable and appropriate to identify the influences of the investigated parameters on the thickness of intermetalic layer. Comprehensive analysis of the results based on the regressed equation and microstructure could supply believable and optimized process parameters.
Surface Characteristics of Single Sisal Fiber and Interfacial Adhesion of Composites
Authors: Zhong Lin Xin , Peng Xin Wen , Ren Jun Li , Sun Run Cang
Published: December 2011

Surface characteristics including surface morphology and chemical composition of single sisal fiber and their influences on the interfacial adhesion of sisal fiber/phenolic resin composites were investigated by SEM, AFM, and XPS. The results showed that the surface of the untreated single sisal fiber contained a large amount of lignin (up to 51%). Chlorine dioxide treatment could reduce the surface lignin to a low content (20%). Removal of lignin from fiber surface could enhance the interfacial strength of sisal fiber/phenolic resin composites, giving rise to an increase by 36% in tensile strength. These results indicate that the surface properties of single sisal fiber can be tailored to improve the fiber/resin interfacial adhesion.
Conductive and Mechanical Properties of Graphite Nanoplatelets/PVC Nanocomposites Prepared by Melt Blending
Authors: Cheng Bo , Qi Shu Hua , Ma Li Na
Published: December 2011

Graphite nanoplatelets (Nano-Gs) were prepared by treating the expanded graphite with sonication in aqueous alcohol solution, and then the Nano-Gs/ PVC nanocomposites were fabricated by way of melt blending. The structure of Nano-Gs was characterized by FTIR and SEM, the conductive and mechanical properties of the Nano-Gs/ PVC nanocomposites were also studied. Results show that with a small amount of functional groups distributing on the surface, Nano-Gs have a thickness ranging 30-100nm and a diameter ranging 3-20μm, and disperse randomly in PVC resin matrix. The Nano-Gs/ PVC nanocomposites exhibit low volume resistivity of 104Ω•cm when the mass fraction of Nano-Gs goes beyond 10%, and the percolation threshold of the nanocomposites is as low as 6wt%. Furthermore, with the increase of the filled Nano-Gs, both the tensile strength and notched impact strength of the nanocomposites increase first and then decrease, and achieve the maximal value simultaneously with the addition of 1 wt% Nano-Gs, which increase by 8% and 29% respectively compared with the pristine PVC.
Study on the Properties of Poly(lactic acid)/Starch/Chitosan Blended Materials
Authors: Liu Peng , Gu Cai Qin , Zeng Qing Zhu
Published: December 2011

Former researchers have studied the properties of PLA/starch blended materials, but the influence of chitosan for them has not been studied yet. In this paper, it prepared the blended materials of PLA/starch/chitosan, and studied the compatible, mechanical and thermal properties of them. The results demonstrated that, since chitosan molecules had hydroxy and amino groups, which could form molecular force with the hydroxy groups in starch molecules and the carbonyl groups in PLA molecules respectively, the addition of it would improve the compatibility of PLA and starch. The SEM surface and section photos of blended materials could prove this compatibility, and the mechanical properties of blended materials also certified it. Specifically, with the addition of chitosan, the elongation, tensile modulus and tensile strength were all increase. For thermal properties, the addition of chitosan had no influence on it.
Effect of Heat Treatment on Microstructure and Mechanical Properties of TRIP Steel Sheets Containing Aluminium
Authors: Gao Yi , He Zhong Ping , He Yan Lin , Li Lin , Fu Ren Yuand , Zhou Lei
Published: December 2011

Effect of heat treatment on microstructure of TRIP steel sheets containing aluminium was investigated on Gleeble 3500 thermal simulation testing machine. The microstructure evolution with variation of time and temperature was measured by means of optical metallography (OM) and X-ray stress analyzer. The tensile properties of TRIP steel at room temperature were also measured. It was shown that the maxium value of product of strength and ductility of 22858 MPa% was obtained by treatment of intercritical annealing temperature at 800 for 3 mins and bainitic holding temperature at 400 for 6 mins. The value of yield strength was mainly determinated by the volume fraction of bainite and the content of retained austenite was the key factor to result in optimum strength and ductility of TRIP steel. In addition, the properties of TRIP steel were markedly decreased because martensite, which was deleterious to the ductility, was present in microstructure of the steel soaking at bainitic temperature 350。C for 6 mins.
Effect of Extrusion Time on Microstructure and Mechanical Properties of AZ31B Magnesium Alloy Prepared by Solid-State Recycling
Authors: Wu Shu Yan , Ji Ze Sheng , Wen Li Hua , Li Hong Bo
Published: December 2011

AZ31B magnesium alloys recycled by solid-state process from oxidized chip were extruded repeately. Microstructures and mechanical properties of recycled alloys for different extrusion times were studied. With the increasing extrusion times, the breaking degree and homogeneity of oxide increase and stream line feature of oxide become less obvious. Second extrusion make dynamic recrystallization microstructure of recycled alloy become more homogeneous and fine, but the microstructure is not refined furtherly after 3 and 4 times extrusion. The ultimate tensile strength increases with the increasing extrusion time, which resulting from the microstructure evolution during repeating extrusion and the enhanced bonding between oxide and magnesium alloy matrix. The elongation to failure of recycled alloy increases after second extrusion and continuously decreases after 3 and 4 time extrusion. This is determined not only by the variation of dynamic recrystallization microstructure and bonding strength between chips but also by the distribution status of oxide.
Mechanical Properties and Morphology of Poly(Lactic Acid) Composites with Oyster Shell Particles
Authors: Nobe Rie , Qiu Jian Hui , Sakai Eiichi , Kudo Makoto , Zhang Min
Published: December 2011

The biodegradable composites were prepared with the oyster shell particles (OSP) and poly(lactic acid)(PLA) by injection molding. The mechanical and thermal properties were investigated. The degradation temperature of the composites decreased by increasing the content of OSP compared with PLA. From the results of tensile test, the tensile strength and the fracture strain of the composites decreased because of exist of OSP. However, the Young’s moduli of the composites increased compared with PLA. The SEM observation of morphology confirmed that the interface between PLA and OSP had poor adhesion.
Oxidation Resistance of Co-10Cr-5Si-0.3Y Alloys at 800°C
Authors: Li Peng , Xiang Jun Huai , Zhang Hong Hua , Zhang Yang , Zhu Jian Rong
Published: December 2011

The effect of the addition of 0.3 at.% Y on high temperature oxidation resistance of ternary Co-10Cr-5Si alloy in 0.1MPa O2 at 800°C was investigated. The addition of 0.3 at.% Y greatly increased the oxidation rate of the alloy and changed the approximate parabolic rate law into linear rate law. The scale formed on Co-10Cr-5Si-0.3Y alloy was double-layered, with formation of an outer layer of CoO and an inner region containing a mixture of CoO, Cr2O3, SiO2 and a trace of yttric oxide, coupled to the internal oxidation region of Si.
Study of Ferrous Material Reduction Based on Thermal Reserve Zone of Modern Blast Furnace
Authors: Guo Liang , Wu Sheng Li , Zhang Li Hua , Tuo Bi Yang
Published: December 2011

Through analyzing and inspecting the raw materials conditions and process conditions that affect ferrous material reduction in the thermal reserve zone, the article indicates that for the three commonly used ferrous material of blast furnace, sinter, pellets and lump ore, sinter is easiest to reduce and lump ore is most difficult to reduce. And increasing of the size of ferrous material promote the reduction of the ferrous material slightly. With the increase of batch weight, weight loss of ore and coke decrease at first and then increase. With the increase of the ratio of coke/ore, the extent of reduction of ferrous material had not significantly improved.
Preparation of Light Transmitting Cement-Based Material with Optical Fiber Embedded by the Means of Parallel Arrange
Authors: Li Yue , Xu Zhi Yuan , Gu Zhong Wei , Bao Zhen Zhou
Published: December 2011

The light transmitting cement-based material (LTCM) is a kind of light transmitting new materials. A large number of optical fiber was embedded in the block and transfer light from the light side surface to the dark side. While at present, the composition, structure and performance of LTCM have been reported rarely. The paper studied the preparation method, light transmitting property and compressive strength of LTCM with optical fiber embedded by means of parallel arrange. The results show that, LTCM gets higher light transmitting ratio with appropriate optical fiber filamentous by means of parallel arrange along the light direction. This kind of LTCM can also achieve, even exceed the light transmitting ratio of the 70g A4 print paper in the light wavelength range of 580~640nm.The light transmitting ratio increases and the compressive strength decreases along with the increase of the optical fiber content in volume.
Rheological and Thermal Behavior of Recycled PET Modified by PMDA
Authors: Wang Ming Yi , Guo Zhi Qiang , Lei Bu Yu , Zhou Nan Qiao
Published: December 2011

In this work pyromellitic dianhydride (PMDA) was used as the chain extender to increase the molecular weight of the recycled poly(ethylene terephthalate) (R-PET) and improve the rheological properties of the R-PET. The reaction was performed in a Brabender torque rheometer. The rheological and thermal characterization were performed by means of a fusion index instrument and a differential scanning calorimeter (DSC ) to compare the effectiveness of the chain extending reaction of different percentages of PMDA. The experimental results showed that compared with the unmodified R-PET, the addition of PMDA decreased the melt flow index and increased the viscosity of the R-PET. In addition, increased crystallization temperatures ( ) were observed with the modified R-PET. It was also found that the modified R-PET with the concentration of 1.0wt% PMDA exhibited the lowest MFI.
A Review on Synthesis of High Performance Composites from Zircon
Authors: Ma Bei Yue , Li Ying , Yu Jing Kun
Published: December 2011

The latest development of ZrC-SiC, ZrO2-SiC and ZrO2-mullite high performance composites synthesized from zircon was reviewed. The future development of synthesizing high performance composites from cheap materials and simple preparation technology was prospected.
Preparation and Characterization of Fe36Co36B20Si4Nb4 Nanocrystalline/Amorphous Matrix Composite
Authors: Li Gang , Zhang Zhan Zhe
Published: December 2011

In this paper, we report a Fe-based nanocrystalline-amorphous matrix composite synthesised via partially crystallising an amorphous alloy. The microstructure of the composite was characterize. An amorphous rod of 2mm in diameter was initially prepared via injecting the melted Fe36Co36B20Si4Nb4 alloy into a copper mould in vacuum, which was confirmed to be completely amorphous by X-ray difraction（XRD）. Differential scanning calorimeteric（DSC）curve shown that the span △Tx of the supercooled liquid region and the reduced glass transition temperature（Tg/Tm）for the amorphous alloy are 40 K and 0.615, respectively. The composite composed of nanocrystalline particles homogeneously dispersed in an amorphous matrix was prepared by isothermal annealing. In this course, the amorphous Fe-based sample was held for different time at different temperature. The types of the nanocrystalline phases obtained in different annealing conditions were characterised by XRD and selected-area diffraction pattern（SAED）.The crystallization behavior of the amorphous Fe-based alloy was discussed.
Progress in Thermal Conductivity of Modified Polypropylene Composites
Authors: Li Gang , Cheng Xi Wen , Tang Ming Zhong
Published: December 2011

The exploitation and application of thermal conductive polypropylene composites were introduced in the article. Meanwhile, the development of filled and grafted polypropylene composites occurring both at home and abroad were discussed in detail. The thermal conductive mechanism of the polymer composites were summarized. At last，the approaches of improving the thermal conductivity of polypropylene materials were also raised.
Synthesis and Characterization of Poly(Aryl Ether Quinoxaline)s with Controlled Molecular Weight
Authors: Zhang Song Ya , Li Zhong Xiao , Pu Jia Ling
Published: December 2011

Novel poly(aryl ether quinoxaline)s (PEQs) were prepared via a two-step procedure. First, poly (ether benzil) (PEB) was synthesized by the polycondensation of 4,4’-difluorobenzil and 4,4’-isopropylidenediphenol.Then, PEB was reacted with 1,2-diaminobenzene and 4,4'-oxydibenzene-1,2-diamine to give the PEQs. The molecular weight of the PEQs could be adjusted easily by varying the molar ratio of 1,2-diaminobenzene to 4,4'-oxydibenzene-1,2-diamine. The PEQs exhibited good solubility in common organic solvents such as NMP, DMAc, DMF, cyclohexanone and chloroform. In addition, the PEQs also had high glass transition (Tg) temperatures and good thermal properties, with an initial thermal decomposition temperature above 475 oC and glass transition temperatures above 210 oC. They also exhibited excellent resistance to strong acid and alkali.
Characterization of Nanosize Mn-Zn Ferrites Coated with Citric Acid
Authors: Wang Gui Xin , Liu Chun Jing , Zhang Yu Meng , Peng Hui Fen , Wang Xin
Published: December 2011

The citric-acid coated Mn-Zn ferrite nanocrystalline was prepared by an improved co-precipitation method. X-ray diffraction (XRD) and TEM measurements indicated that the coated samples were pure spinel Mn-Zn ferrite nanocrystalline and the particles coated after boiling circumfluence were more homogeneous than that before boiling circumfluence. Vibrating sample magnetometer (VSM) indicated that the Ms of the coated samples was higher than that without coating. Specially when the content of citric acid is 4.76wt% after boiling circumfluence, the Ms of the coated sample is 54.15 emu•g-1 which is 28.7% higher than that without coating.
Study on Purification and Removal of Iron from Alloy Anode
Authors: Wei Li , Li Peng Wei , Han Tao , Zhang Ting An , Zhai Xin Sheng
Published: December 2011

Residue of alloy anode generated in three-layer liquid electrolytic purifying method is refined, the state of iron in raw materials is analysed. The state (morphology) changes of iron refined by different refining agent are investigated. Results show: 40% of boron salts or phosphate as the main component of refining agent adding 15% NaCl、20% KCl、15% CaF2、5% NaF、5% cryolite, melting the residue of alloy anode at 1100°C and 1200°C respectively, the crystal could be incubated to grow up fully, it is benefit for collecting iron. When the soaking time is 150min, iron component in alloy is 4.8%,it reaches the standard taking back into the aluminum refining process.
Analysis on Factors Influencing Flake Silver Particles Prepared by Chemical Reduction
Authors: Hu Xu Wei , Li Lu Hai , Mo Li Xin , Zhao Sheng Min , Leng Xian , Li Wei Wei , Li Wen Bo , Fang Hua , Li Shu Kun
Published: December 2011

Flake silver powder has attracted tremendous interesting due to its specially electrical and optical properties. Chemical reduction method with the advantages of reaction conditions easily controlled and mass production is widely used to prepare flake silver particles. In order to more easily prepare flake silver particles, the generation mechanism of flake silver particles is studied by analyzing the impacts of reaction conditions, such as pH value, kinds of silver seeds, kind of surfactant and concentration of raw material. The results show that flake silver particles can be prepared through controlling reaction conditions. Some problems existing in the preparation of flake silver particles are put forward, and future research directions are also proposed.
Study on the Electrodeoxidation of Solid Dy2O3 in Molten CaCl2
Authors: Xie Hong Wei , Kim Pyong Hun , Wang Jin Xia , Zhai Yu Chun , Zou Xiang Yu , Lang Xiao Chuan
Published: December 2011

The electrodeoxidation of Dy2O3for preparing metal Dy in CaCl2melt was studied by cyclic voltammetry, constant potential electrolysis techniques and thermodynamics analysis. Two electrodes system was employed during measuring cyclic voltammetry. Only one cathodic current peak(at about -1.75V ) was discovered before the decomposition of CaCl2which corresponded to the electrodeoxidation of Dy2O3in the cyclic voltammograms in molten CaCl2at 850°C. The validity of the cyclic voltammograms was further confirmed by thermodynamics analysis and the CO2、CO anodic gas detected. In constant potential electrolysis products there were no other intermediates except Dy2O3and Dy observed by XRD. And the results confirmed the following electrodeoxidation sequence: Dy2O3→Dy.
Microwave and Conventional Hydrothermal Synthesis of TiO2 Nanoparticles and their Photocatalytic Activities
Authors: Zhu Lian Jie , Miao Hui , Liu Kun , Sun You Guang , Qiu Mo , Zhu Xu Chen
Published: December 2011

Series of anatase TiO2 nanoparticles with different particle sizes were prepared by a fast microwave-assisted method and conventional hydrothermal method, using ionic liquids, 1-ethyl-2,3-dimethylimidazole bromide and N-butylpyridinium hexafluorophosphate, and polyethylene glycol as templates, respectively. The crystal structures and morphologies of the nanoparticles were characterized by XRD and SEM. Their light harvesting capabilities and band gap energies were investigated by UV-Vis diffuse reflectance absorption spectra. The surface –OH groups were detected by FT-IR and the photocatalytic activities were estimated by photodegradations of rhodamine B aqueous solutions under simulated sunlight irradiation. The results show that the type of the template and synthetic method affect the particle sizes of the products, and the photocatalytic activities of the TiO2 nanoparticles are close related with their particle sizes.
Research of Surface Flattening Method Based on Triangle and Energy Model
Authors: Sun Bo , Wang Ji Qing , Liu Zheng , Chen Hua
Published: December 2011

In order to acquire reasonable blank shape of sheet metals with complex surface, surface flattening method based on triangle and energy model is put forward. According to equal surface principle, the surface is divided into many triangles, which are flattened one after another. Meanwhile, the surface is regarded as energy model, which is used to alter original flattened discrete points. Finally, surface approximate flattening is completed with second development technology based on Pro/ENGINEER platform. In sheet metal manufacturing process, reasonable blank shape is generated quickly.
Analysis of Grinding Angle Based on Grinding Machine
Authors: Li Ping , Wang Bang Jun
Published: December 2011

The value of grinding angle of grinding machine directly affects working efficiency and processing precision of gear grinding machines. A mathematical model of Generating Motion is established by analyzing and studying working principle and machining processes of the grinding machine. Equations of Generating Motion had been determined when the grinding machine was working. Then the relationship between grinding angle and Generating Motion was gotten and the optimal value of the grinding angle was finally obtained.
Numerical Control Reformation for Gear Shaving Machine
Authors: Gao Hong Hong , Li Ping , Lao Qi Cheng
Published: December 2011

A numerical control (NC) reformation scheme is presented to reduce the failure rate and improve the performance and efficiency of the old gear shaving machine. On the basis of study the mechanical structure and shaving methods, the numerical control system 828D and the servo driver S120 developed by Siemens Company are used to replace the old control system. The diagonal shaving method is selected to design shaving program after analysis of the process route. The reformation completed parametric programming, realized numerical control of the shaving machine and improved the reliability and flexibility of the system.
Study on Collision Algorithm of Virtual Gear Measuring Center
Authors: Wang Jian Hua , Tan Chuan Chao , Zhang Fu Yu
Published: December 2011

This paper introduces the concept of virtual gear measuring center. With different type of probe, the mode of collision between the probe and the workpiece divides into touch-type collision and continuous scanning collision. Combining with collision algorithm at home and abroad, the collision algorithm is improved. And the application of two collision detections in the virtual gear measuring center is analyzed.
Research for Coiling Temperature Control System and Mathematical Model on Hot Strip Mill
Authors: Zhang Lei , Xu Hai Gang , Zhang Chao , Duan Chao Wei
Published: December 2011

Laminar Cooling is an indispensable part of hot strip steel mill. Based on the devices, instruments and control requirements of 1150mm hot strip steel mill in a certain actual Iron & Steel Co., the laminar cooling control system is designed, including hardware figuration, network framework, software functions, mathematical model, etc. The engineering practice proves that the control system is steady and reliable, and it has the value being popularized in the other similar production line.
Design for Electrolyte Sedimentation Basin Based on COMSOL
Authors: Li Dan Dan , Fan Zhi Jian
Published: December 2011

The long spiral tube with its deep rifle groove make a long duration for Electrochemical Machining (ECM) and mass of floccule precipitate, esulting in bottleneck to maintain cleanliness of electrolyte in sedimentation basin at machining. The design scheme of duplex vertical flow electrolyte basin was proposed. The surface hydraulic power, available cubage, flooding area, sludge blanket level (SBH) and sludge tank height were calculated in terms of the electrical current, sinking speed of Fe(OH)3, flux of electrolyte. The streamline in the basin were simulated by COMSOL based elementary draft. The flow speed at intake of sludge blanket and the exit of clarified were analyzed with diameter of cone-meatus of center tube being altered and the space between it and baffle-board shifted, and the sedimentation basin is optimized.
Research of Optimizing Ordering and Inventory Control of Supply Chain Systems Based on GA
Authors: Gao Yong , Li Ming Yu , Wang Jian Ping
Published: December 2011

In order to resolve material ordering and inventory control problem in supply chain, optimization method based on GA is put forward. Supply chain model in the paper is made up of one supplier, one manufacturer, N-retailers and end customers. Moreover, supply chain model is developed in terms of two policies: traditionally centralized controlling policy and the coordinating controlling policy. Lastly, optimizing ordering and inventory control problem for supply chain is solved by genetic algorithm (GA), and an instance is illustrated to show the validity of the method.
Dynamic Simulation Analysis of Stacker for Automated Warehouse
Authors: Zheng Yu Qiao , Zhao Rong Zhen , Zhang Shu Zhen , Peng Bin
Published: December 2011

The dynamic characteristics quality of automated warehouse directly affects its reliability and efficiency. It is difficult to get the dynamic properties of automated warehouse with traditional design methods. The physical model of the GWD2005 automatic warehouse is established with the finite element method. Modal analysis is applied to stacker structure. Natural frequency and vibration mode of automated warehouse is confirmed. The instability factors of existing structure vibration are studied. The results show that the analysis method is effective to design the structure of automated warehouse.
Order Parameters Evaluation Indexes and Quantitative Analysis Model on Order Degree of Manufacturing System
Authors: Yan Li , Chen Qing , Hao Rui Qing
Published: December 2011

In order to describe the evolution of the manufacturing system from disorder to order, the order parameters of synergetic is applied. According to the basic features and selection principles of the order parameters, the order parameter of manufacturing system and the order parameter evaluation index system are put. On this basis, the quantitative analysis model on order degree of manufacturing system is proposed. The order degree of manufacturing system according to the statistical data from year 2000 to 2008 in China is taken out. The results show that the order degree of the manufacturing system in China which gradually and orderly develops to the benign direction is increasing year by year. It conforms to the current situation of manufacturing industry in China.
Design of Silicon Based on Bio-Electrodes for Deep Brain Stimulation
Authors: Qin Ge , Ren Taian , Wang Zhi Wei
Published: December 2011

In the treatment of nerve disorders, bio-electrodes are used to be implanted into the patients’ deep brain to provide electrical stimulation to improve the symptom and deep brain stimulation has been regarded as the most effective method to treat nerve disorders in clinic medicine. This paper presented a simple structure of bio-electrode implanted in deep brain for long term stimulation. Based on a 3D finite element modeling of electrostatics for the electrode, the influence of the electrode dimensions on the electric field distribution was discussed. The dimension and structure of the electrode was determined on the volume of tissue activated by deep brain stimulation.
Research for the Influence of Canopy Mesh Fabric Perforation Structure on its Mechanical Properties
Authors: Tian Shao Hui , Hu Zhi Yi , Chen Hong Shu
Published: December 2011

Under the circumstance of the same parameters as fabric density, yarn type and so on, different fancy openwork could be weaved respectively in which the fabric mesh layout are various. Then in order to get the fabric pore size distribution parameters under the best mechanical strength, the different fancy openwork should be applied in tensile and tear strength tests, which can contribute to analyze the relationship between mesh fabric structure and its mechanical property.
Correlation between Fractal Dimension and Impact Strength for Wood Plastic Composites
Authors: Qiang Tao , Yu De Mei
Published: December 2011

Polylactide (PLA)-based wood plastic composites (WPCs) were manufactured by extrusion blending followed by injection molding. The fracture surfaces created from the impact test were recorded with SEM. Fractal analysis has been used to calculate the fractal dimension of the fracture surfaces with four different fractal analysis techniques. Then, the correlation between the fractal dimension of the fracture surfaces and its impact strength of the PLA-based WPCs was investigated by the linear regression. The results showed that there is a positive correlation between the impact strength and the fractal dimension.
Solving Job-Shop Scheduling Problem by an Improved Genetic Algorithm
Authors: Yang Yan Li , Ke Wei Wei
Published: December 2011

An improved genetic algorithm is proposed by introducing selection operation and crossover operation, which overcomes the limitations of the traditional genetic algorithm, avoids the local optimum, improves its convergence rate and the diversity of population, and solves the problems of population prematurity and slow convergence rate in the basic genetic algorithm. Simulation results show that compared with other improved genetic algorithms, the proposed algorithm is better in finding global optimal and convergent rate.
A Shape Retrieval Study Based on Geometric Signature
Authors: He Jing Fang , Peng Jing Ye
Published: December 2011

This paper discusses a shape retrieval study based on geometric signature. We apply a variation signature method to extract the geometric feature of shapes. Then, we compare the performance of geometric signature and Fourier descriptor. The geometric signature gets a recall of 74.498%, precision of 71.519%, and F-measure of 72.978% while the Fourier descriptor gets a recall of 18.326%, precision of 17.593%, and F-measure of 17.952%. The proposed method performs better.