bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation of Fracture Mechanism of Casing-Drilling Steels
Authors: Xu Tian Han , Feng Yao Rong , Song Sheng Yin , Jin Zhi Hao , Wang Dang Hui
Published: February 2011

The paper reports on an investigation of the fracture mechanism of both tensile and impact fracture in three types of casing-drilling steels. The results show that the tensile fracture surface of N80 steel includes fibrous zone, radiation area and shear lip zone, and those of both K55 and P110 steels include two zones; all the tensile fracture surfaces of three types of casing drilling steels show the ductile fracture mode, the ductile fracture mode indicated with dimples is observed on all zones; the impact fracture surface of the N80 steel possesses a combined quasi-cleavage and ductile fracture modes, a single fracture mode is observed on the fracture surface of both K55 and P110 steels, the K55 steel impact sample is fractured in a cleavage brittle manner, whereas the P110 steel impact sample is fractured in a dimpled ductile manner.
Cyclic Mechanical Properties of 16MnR Welded Joint under Constant
Authors: Xiong Ying , Zheng Han Ying
Published: February 2011

Fatigue tests are carried out for 16MnR welded joint under constant strain control. Test results reveal that 16MnR weld metal exhibits characteristic of cyclic softening and non-masing obviously. The strain–life curve can be best described by the three-parameter equation. It shows the fatigue endurance limit in the heat-affecting zone (HAZ) of welded joint is lower than that in the weld metal.
The Effect of Acrylic Bone Cement Solidification Conditions on the Compressive Property
Authors: Zhang Lan Feng , Ge Shi Rong
Published: February 2011

A few experiments are conducted to investigate the effects of different solidification process on the physical hardness and compressive strength of the home-made bone cement. 24 bone cement samples under different mixing conditions are prepared. The compressive strength, hardness and phase composition of bone cement samples are measured with electronic universal machine, Shore hardness tester and X-ray diffraction(XRD) respectively. The results show that the maximum compressive strength of 24 samples is 96.27MPa, and obviously superior to that of the clinical application of bone cement. The hardness of bone cement of group C( powder 20g and fluid 10ml, 80.43HD) and group D(powder 20g and fluid 12ml, 86.60HD) is higher than 80HD which is the clinical requirement.It is found by X-ray diffraction that the higher crystallinity could produce finer grain, which results in higher compressive strength and hardness with better ductility and toughness. Giving consideration to compressive strength and physical hardness and crystallinity of D3(20g:12ml, with stirring speed as 30 times/min and stirring time as 90 seconds), the solidification condition is best.
Effect of Crystals Size, Surface Area and Pore Size of Hydroxyapatite Microspheres on the Loading Ability of Bovine Serum Albumin
Authors: Li Jun Ming , Wang Ai Juan , Lv Yu Peng , Jiang Bai Ling
Published: February 2011

Effect of crystals size, surface area, pore size and porosity of hydroxyapatite microspheres on the loading ability of bovine serum albumin was studied in this paper. The surface morphology, specific surface area and porosity of hydroxyapatite microspheres were characterized by scanning electron microscope, specific surface area and pore size analyzer, respectively. The concentration of BSA in aqueous solutions both before and after adsorption was determined by ultraviolet-visible spectrophotometer. The results indicated that the adsorption behavior of bovine serum albumin appeared to obey the Langmuir-type isotherm model. Fast adsorption appeared at the beginning, and then decreased gradually. Hydroxyapatite microspheres calcined at 600°C had the maximum capacity, and those calcined at 800°C showed lower adsorption ability. The loading ability of hydroxyapatite microspheres depended on its crystal size, specific surface area, pore size and porosity, etc.
Effect of Sputtering Power on the Properties of Transparent Conducting Ti-Al Co-Doped Zine Oxide Films Prepared by DC Magnetron Sputtering
Authors: Shi Xiao Fei , Liu Han Fa
Published: February 2011

Transparent conducting Ti-Al co-doped zinc oxide films (TAZO) with high transparency and relatively low resistivity have been successfully prepared by direct current magnetron sputtering. The effect of sputtering power on the structural, optical, and electrical properties of Ti-Al co-doped films were investigated. The XRD patterns show that the thin films were highly textured along the c-axis and perpendicular to the surface of the substrate. The electrical resistivity decreases when the sputtering power increases from 40W to 120W. When the sputtering power is 120w and the target-substrate distance is 60mm, it is obtained that the lowest resistivity is 3.23×10-4Ω·cm.The lowest stress is 0.864Gpa in all the deposited films. All the films present a high transmittance of above 91% in the visible range.
Preparation Technology of Zn-Peptide Complex and Its Effects on Growth Performance and Immunity of Oreochromis Niloticus
Authors: Zeng Qing Zhu , Guo Cun Rong , Guo Qing Quan , Fang Xi Juan , Zhan Yu , Liu Peng , Fan Ya Ming , Gu Cai Qin
Published: February 2011

Preparation technology of Zn- peptide complexes was studied and its effects on growth performance and serum biochemical indicators were investigated by feeding Oreochromis Niloticus with feedstuff containing Zn-peptide complexes. The optimal conditions of synthesis reaction for Zn-peptide complexes prepared by zinc with peptide were described in the following: pH 5.0, temperature 80°C, and mass ratio of peptide-Zn 4:1, reaction time 30 min. Under such conditions, yield of Zn-peptide complexes was up to 54%, chelating rate of Zn was 55%, and Zn content of the complex was 6.5×104 mg/kg. A new complex formed from Zinc with peptide was identified by spectrum analysis. The 49-day feeding experiment showed that the complexes remarkably increased specific growth rate, survival rate, content of lysozyme and activity of superoxide dismutase (SOD) and alkaline phosphatase (AKP). Feed conversion ratio was significantly reduced as the additive increased. The content of total protein, albumin, and globulin were elevated too. And growth performance, body immunity, anti-oxidation function of Oreochromis Niloticus was significantly increased while the amount of the additive was 2.4 ~ 4.8 g/kg feedstuff in the experiment.
The Design of Two-Way Control System of Master-Slave Medical Robot and its Digital Operation Experiment Research
Authors: Li Shi Jie , Zhang Ya Rui , Bi Hai Xia , Wang Tie Cheng
Published: February 2011

In recent years, the research on the medical robot's already became a new domain about the robot application, particularly the special medical robot already became a direction of the medical robot develops. This article started with the medical robot organization design, construct the three-dimensionalmodel,designed master-Slave Medical robot control system overall project, determined a new two-way control method of force telepresence, developed Master-Slave medical robot control system's simulation software, and conducted the experimental study, the experimental result showed that this simulation system had the very good timeliness and the accuracy.
Development of Ligand Incorporated Chitosan Nanoparticles for the Selective Delivery of 5-Fluorouracil to Colon
Authors: Li Pu Wang , Peng Zheng , She F.H. , Kong L.X.
Published: February 2011

Drug delivery systems with active targeting ligand provide improved therapeutic efficiency due to the selectivity towards tumor cells. In this paper we prepared drug loaded nanoparticles (NPs) using folate (FA) incorporated chitosan (FA-CS) based on ionic gelation technology. FA-CS NPs were spherical in shape with an average particle size of 100 nm, while 5-fluorouracil (5-FU) loaded NPs became less circular with average particle size of 100-500 nm. NPs made from FA-CS conjugates exhibited improved capability to encapsulate hydrophilic 5-FU. It was found 5-FU distributed in FA-CS NPs in solid solution state. In vitro release results demonstrated the release of 5-FU from FA-CS NPs was more controllable as compared to that of CS NPs.
Synthesis and Characterization of PVA/MMT Porous Nanocomposite Prepared by Directional Freeze-Drying Method
Authors: Yang Kui , Yang Chang Hui , Li Zhen
Published: February 2011

Porous PVA/MMT nanocomposites, which included a great deal of macroporous, mesoporous and a few micorporous were fabricated by directional freezing and freeze-drying. X-ray diffraction (XRD), Scan Electric Microscope (SEM), Fourier Transform Infrared (FT-IR) spectroscopy, and Thermo gravimetric-differential scanning calorimeter analysis (TG-DSC) were used characterize the samples. Results showed that the morphology and the interactions between MMT and PVA of the obtained porous nanocomposites were influenced by nanoparticle size, colloid concentration , aging time etc.O-H bond in PVA and Si-O bond in MMT, "acetate" in PVA and O-H bond in particle flat of MMT which occurred coupling constituted hydrogen bonding which enhanced the driving power to help PVA molecules insert into interlayer spaces of MMT.
Study on Preparation and Properties of Mesoporous Magnetic Silica
Authors: Zhang Ya Ping , Li Han Sheng , Zhen Bin , Wu Qin , Liu Chang Hao
Published: February 2011

Magnetic materials are one of the promising material for their special magnetic properties and other functionalities. A sol-gel process in reverse microemulsion combined with solvent-thermal technique(ME-SG-ST) was developed for synthesizing nano-sized mesoporous SiO2/CoFe2O4(SCF). Fourier transform infrared spectrometry, TG-DSC, X-ray diffraction, TEM, BET specific surface area measurement, N2 adsorption-desorption and magnetic analysis were used to characterize the structure and magnetism property. Results showed that spinel CoFe2O4 was uniformly dispersed in nanosized SCF particles. The prepared SCF particles possessed mesopore structure and excellent paramagnetism, and will become great promising materials as the supports of catalyst and absorbents for biological and drugs.
Biomimetic Synthesis of Zinc Hydroxystannate-Coated Calcium Carbonate and its Application in PVC
Authors: Xu Jian Zhong , Peng Fei , Jiao Yun Hong
Published: February 2011

Calcium carbonate and zinc hydroxystannate-coated calcium carbonate (ZHSCC) was prepared by biominetic synthesis in template of sodium dodecyl benzene sulfonate (SDBS), and was characterized by XRD, SEM and TG/DSC, moreover, the flame retardant property of ZHSCC in PVC was studed by LOI. The XRD analysis clearly showed the diffraction peaks of zinc hydroxystannate (ZHS) in ZHSCC and calcite crystal structure of calcium carbonate. The TG/DSC and SEM results showed that ZHSCC product was roughly spherical with the size of was about 4 μ. The LOI of PVC/ZHSCC blend increased 5.5 units which showed that ZHSCC had a good flame retardant efficiency for PVC.
Surface Morphology and Shape Analysis of Nonlinear Optical Crystal DAST
Authors: You Fei , Teng Bing , Xia Lin Hua , Xu Hui , Zhong De Gao , Zhang Shi Ming , Yu Yue Juan , Ma Jiang Tao
Published: February 2011

DAST (4-N, N-dimethylamino-4′-N′-methyl stilbazolium tosylate) crystal has been grown by slope nucleation method (SNM) at different cooling rates (0.5°С/d and 0.1°С/d). The morphology of crystal growing surfaces was observed by scanning electron microscope (SEM) and microscope. Different growth striations were found on the growth surfaces. The arrangements of crystal ions and cooling rate have a great influence on the crystal shape. The relationship between the DAST crystal molecular structure and the crystal shape was systematically studied by analyzing the growing surface morphology. Two-dimensional nucleation mechanism was found on growing faces with increasing supersaturation.
Studies on BaO-CeO2-TiO2 Microwave Dielectric Ceramics
Authors: Xiao Yuan , Huang Xiao Gu , Zhang Qi Tu
Published: February 2011

BaO-CeO2-TiO2 microwave dielectric ceramics with the different content of TiO2 were fabricated by a solid-state reaction method using BaCO3, CeO2, TiO2 powders as starting materials in view of the dispute. The sintering characteristics, phase composition, micro-structures and microwave dielectric properties of BaO-CeO2-nTiO2 microwave dielectric ceramics with different n values sintered at different temperatures were investigated. The results showed that the sintering temperature of BaO-CeO2-nTiO2 microwave dielectric ceramics was lower (< 1300°C), and CeO2 didn’t tend to form polynary compounds. When n = 3, the sintered ceramics had excellent dielectric properties: εr ≈40.3, tanδ ≈1.02×10-3 (1 MHz); εr ≈ 41.2, Q•f =19922GHz (6.865 GHz), τf = +22 ppm/°C .
A Novel Ceramic Thermocouple Used in High-Temperature Measurement
Authors: Feng Li Chao , Xie Ning , Shao Wen Zhu , Cui Yu Sheng , Zhen Liang
Published: February 2011

MoSi2 and SiC ceramics were prepared by traditional powder metallurgy method. A novel ceramic thermocouple (CTC) used in the high temperature and high corrosion environment was assembled by SiC as the cathode and MoSi2 as the anode. The thermo-emf of CTC was tested from 25 °C to 1600 °C in air. The results show that there is a simple relationship between the thermo-emf of CTC and the temperature. By holding temperature for 70 h at 1500 °C, the deviation of thermo-emf is ±0.37%, and better than 0.75% which is the criteria of industry thermocouple. And also the response characteristics of CTC were analyzed.
Study on Reforger and Biology Mechanics of Individual Femur
Authors: Zhang Ya Rui , Li Shi Jie , Bi Hai Xia , Liu Jin He
Published: February 2011

The artificial prosthesises currently used are only different in the femoral head size, neck length and stem thickness, but there is not any individualized prosthesis. At present, prosthesis looseness is the main problem of artificial femoral replacement, and individual matching level of joints is the bottleneck of restricting prosthesis replacement surgery. If we can design and produce corresponding individual artificial joints according to the patient's bone shape and bio-mechanical characteristics, there will be a significant impact on human health and medical treatment. In this paper, I complete the reconstruction process of the CT three-dimensional finite element model of femur, with the help of powerful image processing functions of medical imaging system MIMICS. I load force with the experimental data provided by the VIMS laboratory, analyze the biomechanical properties of femur and investigate the influence of anteversion angle parameter on mechanical properties.
Preparation and Stabilization of High Conductivity Zn-Coated Tetra-Needle-Like ZnO Whiskers
Authors: Xia Zhi Mei , Wan Cui Feng , Jin Sheng Ming , Tang Mo Tang
Published: February 2011

Tetra-needle-like zinc oxide whiskers (T-ZnOW) were coated with Zn and stabilized with Al2O3 consequently. Coating conditions for preparation of low resistivity T-ZnOW were investigated. The Zn-coated T-ZnOW was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrical resistance measurement. The SEM and XRD results indicated that the tetra-needle-like structure of ZnO whiskers could be well maintained after coating with Zn and stabilizing with Al2O3. Experiment results showed that the resistivity of T-ZnOW was affected significantly by the annealing temperature, annealing time, coating amount of Zn and original content of Al3+. Al3+ ions played an important role in stabilizing the resistivity of Zn-coated T-ZnOW. The resistivity of T-ZnOW decreased considerably from 108 to 101 Ω•cm when the Zn-coated amount and Al3+ original content were 10.0 wt.% and 2.0 at.%, respectively.Introduction.
Formation and Performance of Cerium Silane Mixture Conversion Coatings on AZ91 Magnesium Alloy
Authors: Du Shi Guo , Lu Yan Ling , Chen Yan Kun , Guo Yi , Hong Qing
Published: February 2011

With soaking treatment, cerium and KH560 silane compound mixture conversion coating are formulated. Various means of analysis such as SEM, EDS, IR, Tafel and EIS were adopted to carry out analysis of surface pattern, element constitution and electrochemical corrosion for mixture conversion coatings of different immersion time. The result shows: When the mixture conversion coating of cerium and silane are formed, the cerium conversion coating takes the priority in generation. Silane conversion coating is mainly absorbed to the cracks of cerium coating, once some exposed base are found at the minor cracks of the silane coating, as a result, definitely cerium coating is generated to make up the exposed base. Therefore, the corrosion resistant capabilities of the mixture conversion coating are higher than pure cerium conversion coating and silane conversion coating.
Preparation of Yttria with Elongated Grains and Micro-Pores
Authors: Dai Wen Bin , Wang Xin Li , Zhao Peng , Yu Jing Kun
Published: February 2011

The effect of 1mol% calcia additive on sintering of yttria was investigated, and a yttria with elongated grains and micro-pores was developed in present work. The results showed that in calcia added samples heated at 1600°C, calcia contained yttria solid solution grains were formed and distributed among pure yttria grains. With the prolonging soaking time, they were concentrated into rod- or plate-like elongated grains and some of them were embedded into pure coarse yttria grains. Furthermore, in calcia added samples, grain growth was much faster and lots of micro-pores were left in coarse pure yttria grains. Water quench test revealed that thermal shock resistance of calcia added sample was greatly improved by elongated grains and micro-pores.
Research on Profile Shock-Cushioning Performance of Foamed Aluminum-Polyurethane Composite Material
Authors: Qi Ming Si , Yang Wei , Zhang Fan , Yuan Qing Fang , Yu Li Na , Zhang Wen Dong
Published: February 2011

We researched the shock-cushioning performance of different shape Aluminum foam-polyurethane composite material, which is a combination material with the polyurethane as base body and the aluminum foam as reinforcing body. The volume proportion of the filling aluminum foam was 12.15%. The structural shape of the composite material constructure were column, equilateral triangle and square, respectively. And the acceleration speed was 7800g. The paper established Aluminum foam-polyurethane shock-cushioning model, and analyzed the stress of the model, gained the distortion of different models, and analyzed shock-cushioning capability of the models. Results showed that the shock-cushioning performance were equilateral triangle, column and square from high to low.
Growth of Tl-2212 Films on CeO2-Buffered Sapphire Substrates
Authors: Xie Qing Lian , yue hongwei , Huang Zi Qian , Huang Guo Hua , Ji Lu , Wang Zheng , Zhao Xin Jie , Fang Lan , Yan Shao Lin
Published: February 2011

Tl2Ba2CaCu2O8 (Tl-2212) films were prepared on r-cut sapphire substrates buffered with CeO2 by dc magnetron sputtering and post-annealing method. The in situ two-temperature process was used to grow CeO2 buffer layers. XRD and AFM measurements showed that CeO2 films deposited at temperature of 370-470°C were excellent c-axis orientation and had smooth surface. SEM observations demonstrated that the Tl-2212 films’ surface morphology was changed from condensing crystal structure to plate-like structure when the CeO2 deposition temperature was increased. The best Tl-2212 film’s critical temperature Tc can reach to 108.3 K, and critical current density Jc obtained at 5.33 MA/cm2 (77 K, 0 T).
Synthesis and Characterization of Novel Ester Functionalized Chiral Ionic Liquids
Authors: Wang Hong Li , Hu Xiao Ling , Guan Ping , Yu Jin Yang , Tang Yi Mei
Published: February 2011

Three different chiral ionic liquids, chloride (R)-(+)-β-(1-methyl-imidazole)–propio-nate, (R)-(+)-β-(1-methyl-imidazole)-propionate terafluoroborate and hexafluorophosphate, weresuccessfully synthesized via the nucleophilic substitution reaction and the anion metathesis reaction, with (S)-(-)-2-chloro-propionic acid as the chiral source. Structures of the chiral io-nic liquids have been characterized by the infrared spectroscopy, nuclear magnetic resonancespectroscopy and quantum chemical structure optimization method. These new ionic materia-ls can be used as building blocks for the synthesis of ionic liquids.
Preparation, Characterization and Infrared Emissivity Properties of Cu / Polyurethane Composite
Authors: Chen Qing Chang , Guo Wei , Wu Hang , Zheng Zhen Zhong , Zhang Ming , Chu Qing Guo
Published: February 2011

By the addition of flake Cu particles to polyurethane the infrared emissivity of polymers can be decreased significantly. In this work, the flake copper particles were prepared by solution phase reduction method. The PU pre-polymer was prepared by a typical method which using polyether polyol N220 and tolylene diisocyanate (TDI). Cu/Polyurethane composite was prepared by using incorporation method. The structure and morphology of Cu particles and Cu/Polyurethane composite were characterized by Fourier transform infrared spectrum spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD) and Energy Dispersive X-ray Detector (EDS). Moreover, the effects of copper particles content on infrared emissivity properties of composite were studied too. The results show that the flake Cu particles were prepared and dispersed well in polyurethane matrix. The infrared emissivity of composite was decreased with increasing particles loading. The composites get lowest infrared emissivity 0.546 when the loading of fillers increased to 20%.
Biocatalytic Regioselective Oxidation of N-Hydroxyethyl Glucamine for Synthesis of Miglitol
Authors: Zhang Jie Bing , Zhang Xiao Li , Wang Duan Hao , Zhao Bin Xia , He Gang
Published: February 2011

N-2-hydroxyethyl-glucamine (NHEG) was converted into 6-deoxy-6-hydroxylethyl-amino-L-sorbose (DHES) by the regioselective oxidation of Gluconobacter oxydans, and then the generated intermediate of this process was produced to N-hydroxyethyl-deoxynojirimycin (Miglitol) by reductive ring closure reaction. Regioselective oxidation reaction was catalyzed by the high activity sorbitol dehydrogenase of Gluconobacter oxydans biomass which was obtained in preliminary studies. Reductive ring closure reaction was carried out under the conditions of 10%Pd/C as catalyst, at 45~55°C and 0.6MPa of hydrogen. Reaction mixture by the separation and purification of strong acidic exchange resin column has been the Miglitol. In addition, the structure and properties of synthetic product was characterized by thin layer chromatography (TLC), melting point, mass spectrometry (MALDI-MS), Fourier transform infrared spectroscopy (FTIR) analysis. The results showed that the miglitol yield is 77.3%.The regional specificity of the high activity sorbitol dehydrogenase of Gluconobacter oxydans has been verified. Moreover, combinating the technology of the Pd/C- catalyzed reductive ring closure reaction, an effective synthesis process of miglitol is achieved.
Band Gap Property of Three-Component one-Dimensional Quasiperiodic Phononic Crystals
Authors: Song Zhuo Fei , Wang Qiang Song , Tian Ya Qiang
Published: February 2011

Studied the ABAC pattern quasiperiodic phononic crystal properties by transfer matrix method, The results show that the frequency of ABAC pattern quasiperiodic phononic crystal initial band gap is lower than AB and AC pattern and the band gap is wider, simultaneously produce strongly localized resonant modes in the first band gap, frequency and quantity of the localized resonant modes are different with different parameters of material C. These properties are useful to the fabrication of the acoustic or elastic wave filters.
Structural, Electronic and Optical Properties of High (γ)-Li2BeSiO4: First-Principles Calculations
Authors: Liu Qi Jun , Liu Zheng Tang , Feng Li Ping , Tian Hao
Published: February 2011

We have performed ab-initio total energy calculations using the plane-wave ultrasoft pseudopotential technique based on the first-principles density-functional theory (DFT) to study structural parameters, electronic structure, chemical bonding and optical properties of orthorhombic Li2BeSiO4. The calculated lattice parameters are in agreement with experimental data. The band structure shows a direct band gap. From the DOS analysis, charge densities and population analysis, electronic and chemical bonding properties have been studied. Furthermore, in order to understand the mechanism of optical transitions of orthorhombic Li2BeSiO4, the complex dielectric functions are calculated and analysed.
Synthesis and Characterization of Some Functional Luminol Derivatives with Aromatic Substituted Groups
Authors: Jiao Ti Feng , Xing Yuan Yuan , Zhou Jing Xin , Wang Wei
Published: February 2011

Some functional luminol derivatives with aromatic substituted groups have been designed and synthesized from the reaction of the corresponding aromatic acyl chloride precursors with luminol. It has been found that depending on the size of aromatic groups, the formed luminol derivatives showed different properties, indicating distinct regulation of molecular skeletons. UV and IR data confirmed commonly the formation of imide group as well as aromatic segment in molecular structures. Thermal analysis showed that the thermal stability of luminol derivatives with p-phthaloyl segment was the highest in those derivatives. The difference of thermal stability is mainly attributed to the formation of imide group and aromatic substituent groups in molecular structure. The present results have demonstrated that the special properties of luminol derivatives can be turned by modifying molecular structures of objective compounds with proper substituted groups, which show potential application in functional material field and ECL sensor.
Influence of Grain Size on Mechanical Properties in a Fe-9Ni-12Mn-2.5Si-1.0C TWIP Steel
Authors: Yang Ze Bin , Zhu Ding Yi , Yi Wei Fa , Lin Shu Mei , Du Cheng Mei
Published: February 2011

We investigate the influence of grain size on mechanical properties in a Fe-9Ni-12Mn-2.5Si-1.0C TWIP steel by unidirectional tensile. Meanwhile the microstructures of the TWIP steel were observed and analyzed by optical microscope (OM) and transmission electron microscope (TEM). The experimental results show that the TWIP steel’s yield strength and tensile strength decrease with the increasing of grain size, whereas the plasticity increases with it. When the average grain size reaches to 27μm, the tensile strength is 1080MPa, the elongation percentage is 77%, and the strength-plasticity product achieves the 83160MPa•%. Steel’s strain hardening rate can be changed from three-stage to four-stage with the increasing of grain sizes, the areas of strain hardening by twin deformation mechanism are expanded. Through the microstructure observation we found that, coarse-grained TWIP steel conducts to twinning formation, the high density twins can increase the alloy’s ductility by splitting the grain.
Study and Application on Crystallization Temperature of Mould Powder for High-Speed Continuous Casting
Authors: Xu Ying , Zhu Li Guang
Published: February 2011

Crystallization rule of mould powder for high-speed continuous casting was studied and the suitable composition powder was done. The analysis of experiment shows: in the given range, the influencing order of different fluxing agents for the crystallization temperature is: Li2O> BaO> B2O3> Na2O> CaF2> MgO. According to different solidification characteristics of steel and the requirements to the performance of mould power, component design of mould powder for high-speed continuous casting was done from the perspective of the crystallization characteristics.
The Spectrum Characteristic Analysis on Double-Layer Kewitte Latticed Shell
Authors: Wang Lin Ge , Zhou Hai Tao , Zhou Yi Zhe
Published: February 2011

This paper demonstrates the natural frequency varying rule with differently critical design parameters for the free vibration characteristics and change features of structural response with different geometric parameters under the simple harmonic excitation.
Effect of Hydrogen Addition on Combustion Characteristics of a Spark Ignition Engine Fueled With Low Heat Value Gas
Authors: Hu Zhung Qing , Zhang Xin
Published: February 2011

An experimental investigation on the effect of hydrogen fraction on the combustion characteristics of a spark ignition engine fueled with low heat value gas-hydrogen blends was studied. The results show that engine indicated thermal efficiency, indicated mean effective pressure and maximum combustion pressure are increased with the increase of hydrogen fraction in the blends. And hydrogen addition shows remarkable influence on engine power and emissions. At the same excess air ratio, HC emissions decrease, CO and NOx emissions increase with the increase of hydrogen fraction in the blends. And engine power is influenced by both hydrogen fraction and heat value in low heat value gas-hydrogen blends combining. Hydrogen significant extends the lean burn limit of combustion of low heat value gas.
Dynamic-Instability Mechanism of Double-Layer Spherical Shell under Harmonic Loading
Authors: Li Guo Fan , Wang Lin Ge , Hao Xiao
Published: February 2011

Based on dynamic instability theory, by incremental dynamic analysis method, large-scale parameters-analysis is carried on double-layer Kiewitt shell under harmonic loading，with weight effects and double non-linear effect calculated and Failure-amplitude is determined. Further exploring on the relationship between excitation frequency changes and failure-amplitude and between initial imperfection effect and load reduction are also conducted.
Chromium Nitrided A283-C Steel as Bipolar Plate for PEMFC
Authors: Choi Chang Yong , Nam Dae Geun
Published: February 2011

Bipolar plate of stack in polymer electrolyte membrane fuel cell (PEMFC) has high cost and heavy weight. In this study, low carbon steel was used as a base metal of bipolar plate for the lower cost than stainless steels, which are widely researched as bipolar plate. Low carbon steel has not a good corrosion resistance. In order to improve the corrosion resistance and electrolytic conductivity, low carbon Steel needs to be surface modified. We made chromium electroplated layer of 5㎛ and 10㎛ thickness on the surface of low carbon steel, and it was thermally nitrided for 3hours at 1173K in a furnace with 50torr nitrogen gas pressure. Cross-section and surface microstructures of surface treated low carbon steel were investigated using OM and SEM. Also crystal structures are observed by XRD. Interfacial contact resistance and corrosion test were considered to simulate the internal operating conditions of PEMFC stack. The corrosion test was performed in 0.1N H2SO4 + 2ppm F- solution at 80°C. The results show that the surface modified steel plates have good corrosion resistance and relatively low interfacial contact resistance, and it should be candidate material as a bipolar plate of PEMFC.
The Corrosion Resistance Properties and Precipitate of Common Artificial Reef Materials
Authors: Chen Hai Yan , Li Wei , Chen Pi Mao , Zhang Hai Yan , Lin Jie Xiang
Published: February 2011

The corrosion properties of several common artificial reef materials were studied using electrochemical methods and by measuring corrosion rates in estuary water and seawater. Experimental results show that the 6063 aluminum alloy can be a reef construction material only in low velocity estuary water. Copper in seawater has high corrosion potential and can be passivated, but the high velocity water will destroy the passivation film and decrease the corrosion resistance of copper. Copper is a suitable reef material in low flow seawater and estuary water. With low open potential, high anode current and extensive corrosion, Q235 steel is only suggested as artificial reef material if applying sacrificial anode protection. Pine block and granite are natural materials whose degradation products won’t harm the environment, but the pine block has short service life while granite has a minimal corrosion rate. PVC has small corrosion rate but leaches toxic substances after degradation, so it is not suitable for wide-ranging use.
Hydrothermal Synthesis and Characterization of Phosphor Doped Tetragonal Zirconia Nanocrystallites
Authors: Yin Jian Jun , Wang Tao , Xing Wei Jing
Published: February 2011

Using zirconium oxychloride hydrate ( ZrOCl2•8H2O) and ammonia water (NH3•H2O) as raw materials, and ammonium dihydrogen phosphate (NH4H2PO4) as additives, tetragonal zirconia (t-ZrO2) with size range of 8–12 nm were prepared by coprecipitation method under hydrothermal conditions. The influence factors on phase transformation and the particle size such as phosphor loading, hydrothermal temperature and calcination temperature were studied by X-ray diffraction (XRD), Fourier transform Roman spectra (FT-Roman), the Brunauer-Emmett-Teller (BET) method and X-ray photoelectron spectroscopy (XPS) techniques etc. Research results show that a small amount of phosphor has been incorporated into the framework of ZrO2 crystals, producing a certain amount of oxygen vacancies. Phosphor can effectively restrain crystal particles growth and improve the thermal stability of metastable t-ZrO2. The phosphor doped t-ZrO2 had a high surface area (244.2 m2/g). In contrast to the pure ZrO2 particles readily aggregating, the phosphor species deposited on the framework of ZrO2 crystals prevented the agglomeration of the primary particles during calcinations.
Phytoplankton Community Characteristic and it's Environmental Indication in the Luanhe–Beidaihe Estuary
Authors: Wang Su Feng , Zhang Yan Long , Li Jian , Jin Yin Long
Published: February 2011

The work showed that there were 44 species belonging to 23 genera, 3 phylum of phytoplankton in the research area. Among them, 31 species of 16 genera were Bacillariophyta, which accounted for 70.5 % of all species, 12 species of 6 genera were Pyrrophyta, which accounted for 36.4 % of all species, as well as one sepecies of genera was Chrysophta, which accounted for 2.3 % only. And 16 species, as the indicator of ‘red tide’ usually, were identified. Among them, 10 species belong to Pyrrophyta, 5 species were belong to Bacillariophyta, and one species of Chrysophta identified was also the dominant alga of ‘red tide’. The Shannon-Wiener biodiversity index showed that the water qualities in all sections were in the level of moderate polluted.
Synthesis and Characterization of Super-Molecular Ionic Liquids
Authors: Liu Hui Ru , Lv Li Qiang , Zhang Xing Chen
Published: February 2011

This study concerned a novel super-molecular ionic liquid synthesized by ammonium thiocyanate and caprolactam. The physical characters such as melting point and electric conductivity were investigated. Results showed that the melting point is -12.2°C at the molar ratio of 3:1 (caprolactam/ammonium thiocyanate), which is much lower than raw materials. The electric conductivities of synthesized ionic liquids were close to that of imidazole ILs. The structure of ionic liquid was characterized by IR, 1HNMR and quantum chemical calculations. It was shown that the NH4+ cation connected with caprolactam organic molecules by hydrogen bonds, leading to the forming of a super-molecular ion. The electrostatic attraction of super-molecular ion with anion was decreased because of the larger volume of super-molecular ion than original cation, thus the melting point decreased. The key properties that distinguish super-molecular ionic liquid from other ILs were the presence of supermolecular ion, which can be used to build up a hydrogen-bonded network. This type ion liquid was named as super-molecular ion liquid.
Experimental Study on Shrinkage of Wet-Sieving Fine Aggregate Concrete Made from Ordinary Concrete
Authors: Zhao Shun Bo , Zhao Shan , Yang Su , Ma Xiao Lu , Sun Li
Published: February 2011

The research is part of wet-sieving concrete technique for building thermal insulated reinforced concrete composite wall. The fine aggregate concrete is made from ordinary concrete passing sieve with square mash of 15 mm for casting surface concrete layer of the wall. Tests were conducted to determine drying shrinkage and autogenous shrinkage of fine aggregate concrete and ordinary concrete. On the basis of test results, the variations of these shrinkages are analyzed. It shows that the shrinkage is almost resulted from drying shrinkage; the drying shrinkages of fine aggregate concrete and ordinary concrete increase rapidly in the early ages before 14 d, the former takes place with large value 1.61 times of the later; the increments of drying shrinkage of fine aggregate concrete and ordinary concrete are almost the same after 14 d. The drying shrinkage of fine aggregate concrete is about 1.23 times of ordinary concrete. The formulas are proposed for calculating the drying shrinkage of fine aggregate concrete and ordinary concrete.
Influence of Ag Doping on the Crystal Structure and Photocatalytic Activity of FeVO4
Authors: Wang Min , Liu Qiong
Published: February 2011

Silver (Ag+) doped iron (III) vanadate (FeVO4) samples are prepared by the precipitation method and then characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy(XPS). The photocatalytic activity under visible light is evaluated by photocatalytic degradation of methyl orange (MO) in the solution. The results show that both FeVO4 and Ag+ doped FeVO4 samples are triclinic, the later have different surface morphology, and some needle-shaped materials appear in the later. From XPS, there are more Fe2+ ions in Ag+ doped FeVO4 sample than that in FeVO4 one without Ag+. It indicates that Ag+ doping can increase the density of the surface oxygen vacancies of catalysts, which can act as electron traps promoting the electron-hole separation and then increase the photo-activity. The decoloration rate after Ag+ doping against methyl orange solution can reach about 81%, and be more about 20％ than that of pure FeVO4.
Characterization and Photocatalytic Activity of FeVO4 Photocatalysts Synthesized via a Surfactant-Assisted Sol-Gel Method
Authors: Wang Min , Liu Qiong , Jiang Chen Zhi
Published: February 2011

FeVO4 photocatalysts were synthesized via a surfactant-assisted sol-gel method and characterized with X-ray diffraction (XRD), scanning electron microsoope （SEM）and specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. The XRD patterns of no-surfactant-assisted, PEG-assisted, CTAB-assisted and SDS-assisted FeVO4, indicate that diffraction peaks can be well indexed as triclinc FeVO4. And the crystalline sizes of samples were evaluated as 113, 69, 66, 76 nm for FVO, FVO-PEG, FVO-CATB and FVO-SDS respectively.The addition of surfactant woul greatly affect the morphology of FeVO4 photocatalysts, which can lead to different photocatalytic activities between them. In the experimental conditions used, the PEG-assisted FeVO4 product had a much higher photocatalytic activity (the photodegradation rate was about 77% or so in 14h) than the other three products.
Preparation and Antibacterial Ability of Silver-Loaded Maifanite
Authors: Yang Zhong Zheng , Wei Jian Ying , Liu Hai Tao , Zhao Wen Xuan , Zhang Yue
Published: February 2011

Silver-loaded maifanite prepared at different particle sizes (60 mesh~200 mesh) and light calcining temperatures (100°C~800°C) of maifanite, different AgNO3 solution concentrations (0.025 mol•L-1~0.300 mol•L-1) and pH values (2~7) were researched, simultaneously antibacterial ability of silver-loaded maifanite was investigated. Results indicate that the appropriate conditions of preparing silver-loaded maifanite are that particle size is 200 mesh, light calcining temperature is 100°C, AgNO3 concentration is 0.1 mol•L-1 at pH=7, and then the silver-loading amount of maifanite gained at this conditions is 1.27wt%; antimicrobial ability of silver-loaded maifanite decreases with increase of light calcining temperature.
Durability of Bittern-Resisting Cement in High Concentration Brine
Authors: Wang Bing Wen , Hou Yun Bing , Zhai Zhi Hua , Han Shuai Jie
Published: February 2011

Bittern-resisting cement (BR) has more excellent performance to resist physical attack and chemical corrosion in high-concentration brine environment than ordinary Portland cement or sulfate- resisting Portland cement. The durability and chemical stability of bittern-resisting cement are studied under drying-wetting cycles in brine, the microstructure and chemical component of hydration products also are determined by SEM/EDXA. The corrosion resistance coefficient Kf of BR mortar prisms in high-concentration brine for 6 months is over 96%, and the mass loss of mortar prisms after 30 drying-wetting cycles in brine is only 4.3%. SEM/EDXA analysis shows that the microstructure and chemical composition of BR hydration products exposed to high-concentration brine environment is more densely and stable than those of ordinary Portland cement.
Phylogenetic Analysis and Microbiologically Influenced Corrosion of a Kind of Sulfate-Reducing Bacteria
Authors: Zhao Xiao Dong , Yang Jie , Fan Xi Qiu
Published: February 2011

A kind of sulfate-reducing bacteria was isolated from the actual marine environment, cultured and enriched for phylogenetic analysis by molecular biology methods, and observed under fluorescent microscopy and transmission electron microscopy to determine the species and morphology. Taking the bacteria as the main object, the influenced corrosion behavior of steels in marine environment was studied in follow-up experiments.
A Study of the Herschel-Quincke Tube Concept
Authors: Liu Xue Guang , Yin Chang Chun
Published: February 2011

A study of the Herschel-Quincke (HQ) tube concept for the reduction of noise in circular ducts is presented here, which contain the models, the attenuation conditions and the acoustic characteristics of HQ tube without flow and with mean flow. Then the simulations have been done by using GT-POWER, which explain the influences on the acoustic characteristics of the angle between the main duct and the bypass duct and the changes of the diameters. The results show that the angle has an impact with flow, no effect without flow, and both of them are affected by the changes of the diameters.
Dynamic Analysis for the Viaduct Type of Longmen NC Engraving and Milling Machine
Authors: Yin Hui Jun , Yang Ping Hui , Jin Jian , He Yun Feng , Pan Yu
Published: February 2011

This paper used UG NX software to establish the whole modal of the machine, which invented by the company itself and mainly used to process the automotive panel mould. The automotive panel mould is made out of Styrofoam. And we have used the advanced simulation which belongs to the software (NX-Nastran) itself to establish the model’s dynamic analysis. In the end, we have got the first six’s characteristic frequency and mode shapes. It provided references for the researcher’s design and analysis about the design of the whole machine.
Dynamic Analysis and Experiment of Beamlike Space Deployable Lattice Truss
Authors: Guo Hong Wei , Liu Rong Qiang , Deng Zong Quan
Published: February 2011

The dynamic equivalent continuum model of beamlike space deployable lattice truss which is repetition of the basic truss bay is established based on the energy equivalence. The finite element model of the lattice truss is also developed. Free vibration frequencies and mode shapes are calculated and simulated based on equivalent continuum model and discrete finite element model. The analytical solutions calculated by equivalent continuum model match well with the finite element model simulation results. A prototype of deployable lattice truss consist of 20 truss bays is manufactured. The dynamic response of lattice truss with different truss bays are tested by dynamic vibration experiment, and natural frequencies of lattice truss with different length are obtained from acceleration response curves. The experiment results are compared with simulation results which verifies that the correctness of finite element model, which also validate the effectiveness of equivalent continuum model indirectly.
Design and Test Analysis of Precise and Fractionized Inertia System of Tire Drum Test-Bed
Authors: Li Shi Wu , Tian Jing Jing , Yang Zhi Fa , Wang Hai Zheng , Wang Lin Hong
Published: February 2011

To analyze the relationship of brake performances and its influence factors, a kind of tire drum test-bed was designed. The gradation principle of flywheels was proposed based on the double multiplication method and an inertial system with eight steps of flywheels was put forward. The inertia-mass of tire load ranging 400 from 5000 kilograms was divided into 256 levels with the accuracy of ±10 kilograms. The dynamics simulation model was built using SOLIDWORKS and ADAMS. The program of acceleration and brake testing were schemed. The feasibility and accuracy of design methodology of test-bed inertial system were verified by the comparison analysis of simulation and road test. The accurate matching between the moment of inertia of test-bed inertial system and tire load was realized.
Team Construction of Adjunct Graduate Tutor of Mechanical Engineering in Local College
Authors: Wang Qiang , Zhao Dong , Zhang Hui , Zhou Yue , Yang Jin Sui
Published: February 2011

According to the analysis of the existing problems of graduate education of mechanical engineering in local college, the necessity is explained for the team construction of adjunct graduate tutor. Based on the joint base of Shandong Province for graduate education which is established by the University of Jinan (UJN) and the Jinan Foundry& Metal forming Machinery Research Institute Co., Ltd. (JFMMRI), practice is carried out to establish a team of adjunct graduated tutor and to explore the education mode of graduate student under the co-operation of Industry-Academia- Research (IAR).
Construct the New Type Experimental Teaching Pattern in Engineering Subject and Strengthen the Practice and Innovation Capability
Authors: Feng Gen Sheng , Feng Ting
Published: February 2011

Experimental teaching is an important part of the undergraduate teaching, which plays an especially important role in training the integrate quality of students. In practical teaching, students should not only have comprehensive theoretical foundation, but also possess good practical and innovation ability in engineering. The construct and implementation of the experimental teaching system will be developed and innovated based on the development of subject and the practice of students’ ability. Novel teaching mode is built by the method of designing comprehensive experimental curriculum, improving teaching system and structure and introducing advanced experimental technology. This is essential for strengthening the ability of integrating theory with practice and engineering practice, as well as improving the scientific thinking and creative consciousness. Furthermore, it is beneficial to cultivate the high-level research personnels.
Study on Game Decision-Making for Manufacturing and Logistics Joint Development
Authors: Ji Shou Wen , Meng Jia Ming , Wang Yu Zheng , Han Xiang Yu
Published: February 2011

Under the background of economic globalization and industrial division coordination, the trend of manufacturing and logistics joint development increasingly apparent. First and foremost, this paper applied system dynamics model for qualitative analysis of the relationship between logistics and manufacturing, and believe that the key to joint development lies in "aspects of logistics outsourcing". Then, this paper analyzed logistics outsourcing decision—making in manufacturing by game theory.
Research on the Ball Annealing Parameters of Steel Cr12MoV under the Effect of Impulse Electric Field
Authors: Song Lin Sen , Lu Peng Tao , Wang Huan Qin
Published: February 2011

The ideal parameters of steel Cr12mov was found under the effect of impulse electric field. Through the corresponding experiments of the new technology, the better ball body of the steel Cr12mov organization had been obtained, while the steel Cr12mov annealing temperature had been reduced, the holding time shortened, the hardness lowed 60 HBS comparable to ordinary annealed. The steel Cr12mov machining performance was better improved.