bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of AlN-ZrO2(Ca) Composites by Pressureless Sintering
Authors: Wang Yan , Wang Rong Lin , Bu Jing Long , Yu Li Xue
Published: December 2011

AlN-ZrO2(Ca) composites were prepared with two kinds of Ca-stabilized zirconia (ZrO2(Ca), i.e Ca-PSZ, particle size d50=65μm and d50=7.5μm) and three kinds of AlN power (d50=15μm, d50=0.5μm and d50=40nm) as raw material in N2 atmosphere by pressureless sintering at 1850 oC. The phase compositions and microstructures of composites were investigated by XRD, SEM and EDS.The sintering performance of the composites was measured by the checking of the bending strength, and the apparent porosity of samples. The results showed that phase compositions of the composites consisted of major phases C-ZrO2 and AlN and minor phase CaAl12O19. It was harder that AlN-ZrO2(Ca) composites were sintered than ZrO2(Ca) material. It was major cause that phase CaAl12O19 formed and its abnormal growed in the boundary layer between AlN particle and ZrO2(Ca) matrix. With 2mm AlN particles as raw material, AlN-ZrO2(Ca) composites had better sintering performance when concent of AlN equaled to 8%.
Investigation of Carbon Fibre Reinforced Composites Based on Novel Phenylethynyl-Terminated Polyimde
Authors: Tong Cheng Xia , Dang Guo Dong , Chen Chun Hai , Zhou Hong Wei
Published: December 2011

As part of the continuing studies to develop high performance composite based on new kind of phenylethynyl end-capped imide oligomers for aerospace applications, PETI-type polyimide composites were prepared from carbon fibre (CF) and polyimide matrix resin derived from dianhydride (s-BPDA), 2,5-bis(4-aminophenoxy)-biphenyl(p-TPEQ) and 4-phenylethynylphthalic anhydride (PEPA). The mechanical properties were tested at both room temperature and 177 °C. The flexural properties were determined by 3-point-bending at room temperature. Thermal aging test was carried out by exposing samples at 177°C over 1000 hours, and the mechanical properties were also evaluated before and after isothermal aging. It was demonstrated that the composite had good thermal and mechanical properties.
Investigation of Microstructure and Mechanical Property of the Machinable B4C/BN Composites Fabricated by Hot-Pressing Process
Authors: Jiang Tao
Published: December 2011

The B4C/BN composites were fabricated by hot-pressing process in this research. The B4C/BN composites included the B4C/BN microcomposites and the B4C/BN nanocomposites. The B4C/BN microcomposites were fabricated by hot-pressing process, and the B4C/BN nanocomposites were fabricated by chemical reaction and hot-pressing process. In this research, the phase composition, microstructure, mechanical property and machinability of the B4C/BN microcomposites and B4C/BN nanocomposites were investigated. The XRD patterns results showed that there existed B4C phase and h-BN phase in the hot-pressed composites. The microstructure of the B4C/BN composites was investigated by SEM and TEM. The B4C/BN microcomposites and the B4C/BN nanocomposites sintered bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The mechanical property of the B4C/BN microcomposites and the B4C/BN nanocomposites decreased gradually with the increase of h-BN content. The mechanical property of the B4C/BN nanocomposites was remarkably improved in comparison with the B4C/BN microcomposites. The machinability of the B4C/BN microcomposites and the B4C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B4C/BN composites specimens increased gradually with the increase of h-BN content. The relationship between the microstructure and machinability of the B4C/BN composites was analyzed. The microstructure showed that the weak interface of B4C/BN and cleavage behavior of laminate structured h-BN particles remarkably improved the machinabilty of B4C/BN composites.
Synthesis and Stabilization of BaTiO3/CoFe2O4 Ferrocolloids
Authors: Zhou Dong Xiang , Shi Fei , Gong Shu Ping , Fu Qiu Yun
Published: December 2011

In this article, nanocomposites of BaTiO3/CoFe2O4have been prepared by sol-gel technique. The samples have been calcined at various temperatures ranging from 500 to 900 °C and then the microstructure of the composite nano-particles was studied. XRD, SEM analysis showed the powders can form the two phase composite system of BaTiO3and CoFe2O4and the average particle size of the crystalline phases is 50nm at sintering temperature of 800 °C. In addition, we have studied the effects of different solvents and mixed solvents on the stability of the nanocomposites suspensions. Results of sediment volumes and conductivity showed under ultrasonic agitation for at least 25 min, suspensions of the BaTiO3/CoFe2O4in ethanol-acetylacetone (1:1 in volume) were most stable (the sediment volumes is 0.6cm3/0.4g, the conductivity is 9μS/cm). Electrophoretic deposition (EPD) was utilized for preparation of magnetoelectric (ME) composite films, the impact of deposition time and deposition voltage on electrophoretic deposition process was investigated. The obtained ME composite films exhibited good ferroelectric and ferromagnetic properties, which can meet the demand of ME devices.
Surface Modification of Carbon Fiber via Atom Transfer Radical Polymerization (ATRP)
Authors: Xiong Lei , Liang Hong Bo , Xu Hai Tao
Published: December 2011

This study demonstrates the surface modification of carbon fiber by grafting polyglycidyl methacrylate (PGMA) using atom transfer radical polymerization (ATRP). Firstly, the surface of carbon fiber was modified by using 3-aminopropyltriethoxysilane and 2-bromoisobutyryl bromide to immobilize ATRP initiators on the surface. Then the glycidyl methacrylate was initiated and propagated on the carbon fiber surface by ATRP. Characterization of these modified carbon fibers included Fourier transform infrared (FT-IR), Thermal gravimetric analysis (TGA) and 1H nuclear magnetic resonance (NMR). The results indicated that the grafting of PGMA from the carbon fiber surface was successful.
Elastic Dynamics Optimization Design of Novel High-Speed Spatial Parallel Robot
Authors: Chen Xiu Long , Jia Shuai Shuai , Du Chong Jie , Shen Shi Bo
Published: December 2011

In order to improve performance of 4-UPS-RPS high-speed spatial parallel robot, the elastic dynamics optimization design was executed. The influence law of the mass of moving platform and the diameter of driving limbs on the dynamic performance, which includes kinematics output response and maximum dynamic stress of driving limbs, were discussed. On these grounds, the mass of moving platform and the diameter of driving limbs were optimized. The simulation results show obvious improvement of the dynamics performance for 4-UPS-RPS parallel robot, therefore the theoretical basis are provided.
A New Modifier Prepared and it’s Applied in High-Density Polyethylene/Anhydrite Composites
Authors: Wang Shao Hui
Published: December 2011

A new Modifier with Silicon radicals as anchoring group and poly(butyl acrylate) as solvatable chain was synthesized and its effect on the properties of HDPE/Anhydrite composites was investigated in this paper. Fourier transmission infrared spectroscopy (FT-IR) results show that the modifier react on the Anhydrite powder particles surface and the modified Anhydrite powder particles particles. compared with that of HDPE/Anhydrite (filled with same non-modified fraction), The impact strength, tensile strength, bending strength and Young’s modulus of modified HDPE/Anhydrite composites increased about 36.6%, 7.5%, 15.6% and 34% respectively. Based on surface analysis by scanning electron microscope (SEM), the Anhydrite powder particles buried well in HDPE matrix when Anhydrite powder particles was coated with the YB modifier. It was found that Anhydrite powder particles significantly increased the crystallization temperature and crystallization rate of HDPE by differential scanning calorimetry (DSC). At same time, through the X-ray diffraction (XRD) found the addition of the YB modifier modified Anhydrite powder particles can not change the formation of crystal HDPE, but can reduce the crystallite size.
Flame Retardation of PP/EPDM Composites Containing Ammonium Polyphosphate and its Microcapsules
Authors: Wang Zheng Zhou , Gu Zhong Qian , Jiang Ping Kai
Published: December 2011

Flame retardation of PP/EPDM blend containing ammonium polyphosphate or its microcapsule (MFAPP) combined with dipentaerythritol (DPER) was evaluated by LOI and UL -94 methods. It is found that MFAPP is better than APP in exerting flame retardation in the PP/EPDM. No apparent improvement in flame retardation for APP and MFAPP in combination with DPER in the PP/EPDM blend. SEM results show that microencapsulation of APP with the melamine–formaldehyde resin leads to some improvement in its dispersion in the blend. Moreover, mechanical properties of the flame retarded PP/EPDM composites are studied.
Precision Predicting and Computer Aided Adaptive Assembly
Authors: Liu Wei Dong , Liu Jian Hua , Jiang Ke , Wang Jie
Published: December 2011

Precision predicting is a new methodology for precision verification and validation of product. Considering the dimension and geometric deviation of assembled part, the precision predicting model is built by assembly deviation sources explaining and deviation propagation route modeling. The deviation source during assembly process is mainly explained by dimension torsor and deviation torsor that are built in common coordinate system, and the deviation propagation rout is modeled by weighted deviation graph. The weighted deviation graph contains vertexes that refer to functional geometry and mating geometry and edges that refer to dimension and geometric constraint; besides, the edge weight is calculated by tolerance evaluation along specific functional direction. In addition, the process of computer aided adaptive assembly method is introduced, and the proper index for assembly precision and accuracy is discussed.
Role of Epoxidized Natural Rubber in Dynamic Mechanical Properties of NR/ENR/silica Composites
Authors: Wang Yue Qiong , Wang Qing Huang , Luo Yong Yue , Zhong Jie Ping , Li Yong Zhen , He Can Zhong , Peng Zheng
Published: December 2011

NR/ENR/silica composites with different ENR amount were prepared in an open two-roll laboratory mixing mill at room temperature. Dynamic properties of ENR filled NR/silica were performed by dynamic mechanical thermal analyzer (DMA) and compression fatigue analyzer. DMA and compression fatigue test results showed that the effect of ENR on dynamic properties of NR/silica was significant. DMA displayed the tanδ of NR/ENR/silica composites at 0 °C was increased with increasing ENR amount. Compression fatigue test indicated the presence of ENR decreased the heat produced during compression test and the heat build-up is the least when NR to ENR ratio is 80 to 20. Scanning electron microscopy was used to investigate the morphology of NR/silica filled with ENR. It is found that silica self-aggregation was improved in the presence of ENR and sea-island structure was formed in NR/silica when 30phr ENR added, which maybe the reason of decrement of heat produced during compression.
Research on the Inclusive Materials of the Rice Direct Sowing Technology with Seed Tape
Authors: Cui Hong Guang , Ren Wen Tao
Published: December 2011

In this paper, tests were carried out with four agricultural mulching films used commonly in Microstructure observations of electron microscope, FTIR spectral analyses, and rice seed growth characteristics testing respectively. PLA non-woven was selected out as the inclusive material for the rice seed tape with the advantages of easy degradation, environmental pollution free, less impact on germination rate and the plant height of rice seed. The results will provide practical significance for the application of the rice direct sowing technology with seed tape.
Retard of D-Galactose-Induced Aging in Mice by Whey Hydrolysates
Authors: Liu Jing , Miao Ying , Zhao Zheng
Published: December 2011

The antioxidant capacities and anti-aging properties of whey hydrolysates fermented by Lactobacillus plantarum TUST200209 and its purified whey peptides were studied, which were dose-dependent and category-dependent. The treatment groups were orally administered high dose (1.5g/kg/day) and low dose (0.5/kg/day) of whey hydrosyates and its purified peptides, and high dose (1.5g/kg/day) of 0.9% saline (vehicle group and aged model group) and mixture of whey and Lactobacillus plantarum TUST200209 in senescence accelerated Kunming mice for six weeks, respectively. Whey hydrolysates and its purified peptides could increase levels of superoxide dismutase, glutathione peroxidase, and decrease contents of malondialdehyde in serum, quadriceps femoris and mitochondria, and for the high dose of whey peptides, most of the increase was significant (P＜0.05) compared with vehicle group. It demonstrated that the whey hydrolysates could significantly retard aging of the mice induced by free radical, especially for its purified peptides.
Rapid Prototyping for Treatment of Cranial Reconstruction Surgery
Authors: Chen Ya Dong , Li Hu , Wu Wen Zheng , Wang Wan Shan
Published: December 2011

Design methods for medical rapid prototyping (RP) of personalized cranioplasty implants are presented in this paper. RP offers an easier way to design customized implants and manufacture them within a very short period. Computed tomography (CT) scans were acquired on a General Electric CT scanner and converted to solid models using Mimics software from Materialise. Stereo lithography patterns were prototyped using Objet build style on a Eden 250.The models helped the surgeons plan and rehearse the surgery well in advance. RP biomedical model is greatly convenient to diagnosis and treatment planning. It could decrease the operation time and the risk of misinterpretation of the medical problem. A physical biomedical model also facilitates surgery planning and makes the rehearsal and simulation of the operation possibly.
Study on Optimization Design of a Hoist Roller
Authors: Liu Li , Liu Hong Xia
Published: December 2011

In the design of wrapping hoist, the roller strength is always a larger problem. In this paper, diameter, wall thickness and side plate thickness of the roller were selected as design variables, and volume of the roller acts as object function. Through analyzing its inner stresses, the mechanical model and mathematical model were set up. Adopting the optimization method of covering complex and VB programming software, an application software of a hoist roller optimization design was got. An example is used to verify correctness and practicability of the software. This optimization design method has practical significance on reducing the weight and material of a hoist roller.
Crystal Structures of New Compounds Na0.5Sm4.5Ti4O15 and Na0.5Eu4.5Ti4O15
Authors: Yu Qiao Hong , Li Zheng Fa , Li Yong Xiang , Si Ping Zhan , Wang Jiang Ying , Ge Hong Liang , Zhang Jing Ji
Published: December 2011

New compounds of sodium samarium titanate Na0.5Sm4.5Ti4O15and sodium europium titanate Na0.5Eu4.5Ti4O15were synthesized successfully by solid state reaction at 1300 oC and 1200 oC, respectively. The lattice parameters of Na0.5Sm4.5Ti4O15and Na0.5Eu4.5Ti4O15were determined at ordinary temperature by using X-ray powder diffraction method. Their Lattice types were determined, and their patterns were indexed. Polycrystalline X-ray diffraction data of sodium samarium titanate were listed. Differences of their crystal structures were analyzed and discussed.
Study on Recovery of High Temperature Waste Gas from Rotary Hearth Furnace
Authors: Qin Jie , Liu Gong Guo , Wu Qiu Ting , Zha Xiao Le
Published: December 2011

The situation of heat recovery of the waste gas with high temperature produced by rotary hearth furnace has been introduced at first, and further more, on the base of actual instance of the pilot which named as comprehensive utilization pilot of vanadium-titanium magnetite in Pangang. Several schemes about the heat recovery of high temperature waste gas have been proposed. The operation conditions of the scheme applied by the pilot also have been introduced. With the application of this scheme, it can make full recovery of the waste heat and 55% of energy can be recovered. Making full use of the heat of waste gas adapts to the social demand of energy conservation and emission reduction and gains better economic and social benefits.
Immobilization of Horseradish Peroxidase on TiO2 Nanotube Arrays via Seeded-Growth Synthesis
Authors: Wu Fang Hua
Published: December 2011

Horseradish peroxidase (HRP) was successfully immobilized on vertically oriented TiO2nanotube arrays (NTAs), which was prepared by seeded-growth mechanism. The nanotubular structure of TiO2was characterized by scanning electron microscope (SEM). After encapsulated HRP on TiO2nanotube arrays, the direct electron transfer of HRP was observed.
An Effective IQ Assess Method before Information Action
Authors: Lu Xu Zhi , Huang Lang Ning
Published: December 2011

Information quality (IQ) research has continued to evolve over the past decades to reflect changes in its practice and a deeper understanding of its business impact. Since information quality essentially represents an organization’s implementation of its business processes, typically, IQ assessment is the result of information actions. Based on the information intension confirming, the method to assess IQ before the information action has been presented. The model established analyses the IQ at two levels: the Syntax level and Intent level. Lastly, The IQ from these two levels has been evaluated by using the IQ function matrix and the Pattern Recognition theory. The result indicates that the method could detect the IQ questions in time, diagnose, backdate the IQ problem position, and search the causation.
Interfacial Transition Zone Micro-Structure of Light-Burnt MgO Concrete
Authors: Chen Xia , Yang Hua Quan , Zuo Yong Zhen , Shi Yan , Xiao Kai Tao
Published: December 2011

The computed tomography was introduced to track the development of cracks in cement matrix and Interfacial Transitional Zone (ITZ) of MgO concrete under load to failure and EDS and BEI was employed to investigate the enrichment characteristics of elements in vicinity of ITZ area. Results indicated that cracks intended to extend along boundary of ITZ area which aggravated ITZ as the weak link of concrete structure. The morphology of products of hydration in ITZ area and cement matrix was similar but differed in amount, size and crystal features. Elements Ca, Si, Al and Mg had tendency to enrich in ITZ zone but differed in accumulation extent in orders. MgO was non-uniformly distributed in concrete, fully mixed in construction though, richer in cement matrix than in ITZ, yet MgO later inclined to migrate to ITZ area and the gap in between was mitigated with in-depth hydration.
Study on Preparation and Mechanical Intensity of Nano-TiB2/ Tussah Silk Fibroin Composite Membrane
Authors: Peng Yu-Yong
Published: December 2011

In this article, new tussah silk fibroin films with nano-TiB2were prepared. The composite films were characterized by SEM、DSC、TG、XRD and IR. The experiment showed that the nano-TiB2 particle was dispersed in the regenerated silk fibroin. DSC revealed that the Tm of the composite films were increased TG showed stability of the composite films could be increased also. XRD showed the conformation of the composite films changed from typical silk I to typical silk II .The experiment of IR showed that these conclusions were right.
Dispersion of Single-Walled Carbon Nanotubes in Water by a Conjugated Surfactant
Authors: Liu Ming Xian , Jia Zhi Xin , Zhou Chang Ren
Published: December 2011

Stable water dispersions of single wall carbon nanotubes (SWCNTs) have important implications for their applications in biomedical and composites field. In this work, a water-soluble optical brightener bearing benzene ring and sodium sulfonate groups was employed as surfactant for SWCNTs in water. The surfactant molecules were absorbed on graphene nanotube surfaces via π-π interaction, Van Der Waals interaction and electrostatic interactions in water under ultrasonic treatment. The functionalized carbon nanotubes were stably dispersed in water for several months without sedimentation. The carbon nanotubes/organic conjugated molecules nanohybrids have potential application in nanocomposites, biomedical engineering, and photovoltaic devices.
A New Method of Producing Carbon Anode by High-Temperature Mould Pressing
Authors: Wang Yao Wu , Feng Nai Xiang , You Jing
Published: December 2011

Laboratory-scale carbon anodes were produced by a new method of high-temperature mould pressing, and their physico-chemical properties were studied in laboratory. The results showed that the bulk density of carbon anodes produced by high-temperature mould pressing are 1.61-1.63g/cm3, they are higher than industrial carbon anode by 0.06 g/cm3, but the specific electrical resistance is higher and crushing strength is lower.
An Analysis on Performance of High-Speed Gear Dynamics Based on Transfer-Matrix Method
Authors: Jin Xiang Yang , Guan Xiang Yi , Zhao Li Li , Wang He Teng , Sun Zhi Hui
Published: December 2011

Analyze the dynamic characteristics of long tooth height gear transmission system by using transfer-matrix method. Firstly, set up a calculation model of level 2 transmission system for long tooth height gear and master gear and construct the transfer equation and transfer matrix of all components, then calculate the rigidity and rotational inertia of the system and know the natural frequency and dominant mode of the whole system through the computer, at last, analyze and compare two systems and prove the superiority of long tooth height gear for reducing vibration and lowering noise.
Preparation and Evaluation of Sodium Hydroxymethyl Lignosulfonate as Eco-Friendly Drilling Fluid Additive
Authors: Zhang Jie , Chen Gang , Yang Nai Wang , Wang Yang Guang
Published: December 2011

Sodium hydroxymethyl lignosulfonate (NaHLS) was prepared by hydroxymethylation of sodium lignosulfonate (NaLS) and formaldehyde to enhance the performance as drilling fluids additive. The performances of the modified drilling fluid with NaLS and NaHLS, such as rheology behavior, filtration reducer and inhibitive ability were evaluated. The results indicate that the NaHLS can enhance the viscosity at low temperature, reduce the viscosity after ageing under 180 °C, which is more effective than that of NaLS. And NaHLS reduces the filtration, as the thickness of the modified fluid mud-cake is much thinner than that of NaLS. Besides, the inhibitive ability of NaHLS for clay hydrous disintegration is more effective than that of NaLS. The properties make NaHLS a potentially effective drilling mud additive.
Preparation and Characterization of Ag, Au and Ti Metal Nanoparticles Colloids by Pulsed Laser Ablation in Liquids
Authors: Xu Bing , Song Ren Guo , Wang Chao
Published: December 2011

Ag, Au and Ti metal nanoparticles colloids have been prepared by pulsed laser ablation in various liquids. The particle size and morphology of the obtained nanoparticles colloids were characterized by transmission electron microscopy (TEM), the average diameter and its distribution were analyzed by Image-ProPlus software. The results showed that the Au nanoparticles were of the best characterization, the average diameter was the smallest (D=8.79 nm), and also, the distribution of particle size was the narrowest (=17.5 nm) and the morphologies were more homogeneous.
Improve the Temperature Resistance of Guar Gum by Silanization
Authors: Zhang Jie , Chen Gang
Published: December 2011

For gelating agent in hydraulic fracturing fluid, the temperature resistance is required. To improve the temperature resistance of Guar gum (GG), it was modified by silanization. The reaction conditions were investigated, and the optimized conditions were as following: the reaction temperature of 85°C, 5: 1 molar ratio of guar gum to TMS-Cl and 4-6 h of reaction time. The viscosity of silanized guar gum (SGG) aqueous gel was greatly improved even high temperature at 80°C.
Study on the Structure and Properties of Surface Nanocrystallized Zr-4
Authors: Zhang Cong Hui , Liu Da Li , Lan Xin Zhe , Zhao Xi Cheng
Published: December 2011

A nanostructured surface layer was obtained on the surface of Zr-4 by surface mechanical attrition treatment(SMAT). The structure and the properties of the SMAT sample were analyzed by means of the optical microscope, hardness and polarization curve testing. The results show that， when processing time for 5min, the average grain sizes on the surface layer can be refined to 23nm. The average grain size by SMAT-ed for 15min is 20nm, which is the smallest. The microhardness have a significant increase, the surface roughness also increase, and the corrosion resistance reduce in 1mol H2SO4solution.
A Novel Rectangle Plasmonic Optical Nano-Antenna with Two Protrusions in the Middle Gap
Authors: Yuan Zong Heng , Liu Zhi Wei , Song Mei Jie , Huang Jing
Published: December 2011

The strong field enhancement of a new type of rectangle plasmonic optic nano-antenna with two protrusions in the middle gap is studied by the comparison with two another common rectangle structures using CST software. The intensity of the new type presented in the paper is about 2.5 times more than its common counterpart, up to about 60V/m in the center of antenna, and the position of peak shifts to visible region (406THz) from infrared region (382THz). Further more, the resonant magnitude in the region of corners of protrusions in the middle gap is somewhat larger than that in center region of antenna, and the resonant frequencies all are controlled in the visible range, about 410THz,the results indicate that the protrusions have a good effect on the performance of antenna. Moreover, when a glass substrate is used, the maximum of field magnitude is about 3 times lager than the same structure without substrate, up to 214 V/m, and the resonant frequency red-shifts to about 359THz, which demonstrates that the substrate plays a important role in the excitation of stronger enhancement. The type presented in the paper has a certain reference for the fabrication of high-quality optical nano-antennas and solar cells etc.
Manufacture and Characterization of TiO2 Nanowires by CVD
Authors: Liu Wei Long , Hsieh Shu Huei , Chen Wen Jauh
Published: December 2011

Under the catalysis of Co metal, the nanosized titania could be grown on Ti substrate at elevated temperature under a gas mixture of N2, O2, CH4 , and H2O. The nanosized titania was characterized by scanning electron microscope for its morphology, and by an energy dispersion spectrometer for its composition. The results showed that the straight and long titania nanowire could be formed at 900°C under a gas mixture of N2, O2, and CH4. When H2O vapor was added to the gas mixture, the titania nanowire became somewhat curved. The tiania nanowire was oxygen deficient, i.e. TiO2-X.
Effect of Additives on Thermal Decomposition of Phosphogypsum
Authors: Yang Chang Yan , Wei Yun , Ye Fa Bin , Ding Yi Gang , Wu Yuan Xin
Published: December 2011

The effect of different additives on thermal decomposition of phosphogypsum was investigated by means of a thermogravimetry coupled with a Fourier transform infra-red spectroscopy. These additives included C, CaO, Al2O3and S. The temperature of thermal decomposition of phosphogypsum is about 1100~1320°C without any additives under the background of nitrogen. The temperature of the thermal decomposition of phosphogypsum decreased obviously with the addition of CaO, C and S. No influence was found for the thermal decomposition of phosphogypsum with the addition of Al2O3. As one of evolved products from the thermal decomposition of phosphogypsum, SO2production was discussed.
Rectifying Property of the Heterojunction Composed of La0. 8Sr0.2MnO3 on Si with and without SrMnO3 Diffusion Barrier Layers
Authors: Li Tong , Zhang Yu , Ni Xiao Chang
Published: December 2011

La0.8Sr0.2MnO3 (LSMO) films with SrMnO3 (SMO) diffusion barrier layers were deposited on (100) Si substrates at 600oC by RF magnetron sputtering. From X-ray diffraction patterns (XRD), (110) peak of LSMO has been greatly enhanced in LSMO/SMO/Si, which may result from small lattice mismatch between SMO and LSMO Rutherford backscattering spectrometry spectra (RBS) measurements clearly show that there is a sharp interface between SMO and Si and small diffusion between LSMO and SMO after introducing SMO diffusion barrier layer. Small lattice mismatch is also considered to play an important role in deciding good interface quality. The current-voltage measurement shows a good rectifying property of LSMO/SMO/Si when the thickness of SMO is 50 nm. On further increasing SMO thickness, the junction currents are depressed at the same applied positive voltage. We attribute the results to the bigger junction resistance caused through introducing thicker barrier layer.
Kinematical Analysis on Three-DOF Cylindrical Industrial Manipulator
Authors: Tao Ke , Wang Xu
Published: December 2011

Base on robot D-H method, the features of three-DOF cylindrical industrial manipulator are analyzed, the motion equation of robotic mechanisms are deduced by using coordinate transformation method and symbolic method. Then three-DOF cylindrical industrial manipulator inverse kinematics solving analytic formula is found. That provides a basis for the position and speed control of actual three-DOF cylindrical industrial manipulator.
Research on the Effect of Microalloy Elements Mo and Nb on CCT Curve of Q&P Steel
Authors: Kuai Zhen , Chen Yin Li , Zhuang Bao Tong , Zhao Ai Min , Jiang Yin Hua , Zhu Guo Sen
Published: December 2011

A novel microalloy Q&P steel with Nb and Mo is designed. The dilatometric curves of low-carton microalloyed Q&P steel with and without Nb and Mo are detected at different cooling rates on DIL-805 thermal dilatometer．The CCT curves are determined using thermal dilation measurement, microstructure observation and hardness measurement. In the Q&P process, the niobium carbide precipitate plays a precipitation strengthening effect, so the tensile strength of Q&P steel is enhanced. The results show that: The element Nb decreases the phase-transformation temperatures of ferrite and pearlite, which leads the proeutectoid ferrite and pearlite phase transformation finish lines to move to lower-right. For the low-carton Q&P steel microalloyed with Nb and Mo, when cooling rate is higher than 5°C•s－1, the microstructures is only martensite. Its excellent hardenability is propitious to improve the strength of the Q&P steel. While, for the traditional C-Si-Mn Q&P steel, the martensite can be only obtained until the cooling rate higher than 20°C•s－1.
The Strength Model of Small Parameter Scroll Wrap in a Scroll Compressor
Authors: Bing Shao
Published: December 2011

The paper analyzed the pressures and the temperatures in compression chambers for calculation of bending fatigue strength , and a strength model is proposed. For the small parameter scroll wraps, the pressure loads are of π-region pressures which have a normal angle interval of π, the number of acting regions for pressure loads is equal to the number of scroll compression chamber pairs. Apart from the part situated in the center compression chamber, the temperatures of scroll wrap decrease linearly with the normal angle. Selecting the reasonable discharge, specifying the appropriate material and the parameters, and modifying the starting part of scroll wrap are significant methods to improve fatigue strength of scroll wraps in practice.
Effect of Casting Design to Microstructure and Mechanical Properties of 3 Mm TWDI Plate
Authors: Soedarsono Johny Wahyuadi , Suharno Bambang , Sulamet-Ariobimo Rianti Dewi
Published: December 2011

The problem occurs in producing thin wall ductile iron (TWDI) is high cooling rate due to its thickness. Cooling rate must be strictly maintained to prevent carbide formation. There are many ways to control cooling rate. Casting design is one of these, especially gating system design. This parameter is often chosen because of its independence. Major changes in equipment and raw material used in the foundry are not needed when a casting design is chosen to deal with cooling rate. This paper discusses the effect of gating system design on microstructure and mechanical properties of 3 mm TWDI plate. A casting design based on gating system design is made to produce 1, 2, 3, 4, and 5 mm TWDI plates. There are three designs coded as T1, T2, and T3. These three designs were also used in making 1 mm TWDI plates of which the result has been published. The plate with thickness of 3 mm will be used for automotive component like the crankshaft made by Martinez. The moulds used were furan sand. Beside the experiment, casting design simulation with Z-Cast was also conducted to see the behaviour of solidification in 3 mm TWDI plate. Simulation result showed every design has its own solidification behaviour for 3 mm TWDI plate, especially for T2. Experiment result showed that all the designs have microstructure consisting of nodule graphite in ferrite matrix, no trace of carbide and skin effect are formed. Skin effect length is various for all designs. Nodularity exceeded 75% and nodule count exceeded 900 nodules/mm2. Brinell hardness number for all design is beyond standard given by JIG G5502. As for UTS and elongation none of the designs exceed the minimal standard. Experiment results confirmed simulation result. Compared to the previous result nodularity and nodule count decrease and curve trends for every result are not the same.
Experimental Study on the Welding Property of Different Gauge Laser Tailor-Welded Blanks
Authors: Lu Wan Qiang , Xue Song
Published: December 2011

Laser tailor-welded blanks is one of the widely used in automotive industries as it reduces manufacturing cost and weight and also improves the quality of the components. The effects of difference in material properties, welding properties on blank formability become important in various forming processes. In this study the welding property of different gauge laser tailor-welded blanks was observed in microhardness and microstructure aspect. The property effects on the formality of the tailor-welded blanks were discussed. That the laser welded joint is qualified to satisfy the demand of sheet forming.
Fully Automatic Wafer-Scale Micro/Nano Manipulation Based on Optically Induced Dielectrophoresis
Authors: Qu Yan Li , Zheng Mei Juan , Liang Wen Feng , Dong Zai Li
Published: December 2011

Optically induced dielectrophoresis (ODEP) has been proved experimentally as a powerful method for efficiently manipulating some micro-scale, or even nano-scale objects. However, few ODEP platforms have been demonstrated towards the fully automatic wafer-scale manipulation and rapid fabrication of micro and nano sensors and devices. That would be of great significance to the application and industrialization of micro and nano materials. In this paper, an innovative ODEP platform for reconfigurable and automatic micro/nano-scale material manipulation is presented by combining microactuation and microvision analysis with ODEP technology. The ODEP chip consists of a typical photoconductive layer of amorphous silicon, which generates a nonuniform electric field at the light-illuminated region to induce dielectrophoretic (DEP) force for manipulating particles within the chip. A high resolution 3D motorized stage enables an accurate and rapid movement of the chip in wafer-scale. The microvision analysis program automatically recognizes the positions and sizes of randomly distributed particles and creates direct image patterns to manipulate the selected particles to form a predetermined pattern in predesired position. The programmed dynamic reconfigurable optical patterns provide increased functionality and versatility in particle manipulation. The patterning of polystyrene beads with different sizes is accomplished. This platform may be promising for rapid and wafer-scale fabrication of micro and nano sensors and devices, high-throughput bio-sample pretreatment and other applications requiring massively parallel manipulation.
Effect of Envelope Films on Thermal Properties of Vacuum Insulation Panels with Glass Fiber
Authors: Wu Wang Ping , Chen Zhao Feng , Zhou Jie Ming , Cheng Xue Yu
Published: December 2011

The VIPs consist of the glass-fiber core material and two types of envelope film. The glass fiber was fabricated by a centrifugal blowing process. The core material was prepared by the wet method. The thermal conductivities of the materials were measured by the heat flow meter. The microstructure of the envelope film was observed by scanning electron microscopy. The porosity ratio and largest pore size diameters of the core materials are 92.27% and 20μm, respectively. The thermal conductivity of the VIP is about 8-10 times higher than that of the core materials. The thickness of type I and II envelope films are 45μm and 400μm, respectively. The thermal conductivities of the type I and type II envelope films are 0.11W/(m•K) and 0.69W/(m•K), respectively. The thermal conductivity of the VIP with type II envelope is higher than that of the VIP with type I envelope, which is attributed to the different structures and thickness of the envelope film.
Study on SH-CCT Diagram and Weldability of S890 Steel
Authors: Yang Di Xin , Wang Xing He , Liu Zi Yong , Sun Yuan Fang
Published: December 2011

Abstract. S890 steel is a Mo-Mn alloy system bainitic structual steel which is developed in recent years and its strength is more than 900MPa,this steel is the material of hydraulic support possessing high-performance in coal mine.The continuous cooling curve of S890 steel was determined,microstructure and hardness of this steel in various cooling rate were analysised in the paper.Results have shown that:S890 steel has good quenching degree and quench-hardenability,and it can get steady microstructures which is mainly bainite over a broad range of cooling rate.
EBSD Characteristics of HSLA100 Steel Quenched in the 2-Phase Region
Authors: Yan Xiang , Yin Fu Xing , Zhou Gui Feng , Chen W.
Published: December 2011

The grain and grain boundary characteristics of HSLA100 steel quenched in the 2-phase region were investigated by electron backscatter diffraction (EBSD).The results showed that the austenite amount was controlled by the 2-phase region heating temperature and the composition and morphology of transformation products were mostly depended on the carbon content in austenite. With the quenching temperature in 2-phase region increasing, the dislocation density in bainite decrease as a result of the block bainite coarsening and mergering, which makes the subgrains with much more low angle grain boundaries (2°~15°) decreasing and the massive ferrite with more high angle grain boundaries increasing gradually. Furthermore, the lath martensite or bainite with high angle grain boundaries and subgrains with low angle grain boundaries gradually increase owing to new austenite grain increasing and growing up. With the roles of above two interactions, some EBSD characteristics such as the packet size and the number fraction of high angle grain boundaries all have a peak present at 740°C
UG and VERICUT-Based Processing of Special-Shaped Stone Samples
Authors: Wu Yu Hou , Gao Qiang , Zhao De Hong
Published: December 2011

In order to verify the processability of a special-shaped stone machining center’s horizontal working portion, to process complex stone products. On the basis of analysis of the physical characteristics of diamond cutting tool and stone, create a model and use UG software to program, making this machine center’s dedicated post processor. Simulate NC code that is generated with VERICUT software, optimize the cutting parameters and analyse its surface quality. Avoid interference in the program, gouge, collisions and other phenomena by adjusting the tool axis’s attitude and the tool paths. Actual process verified the reliability of the program, technological parameter is rational, quality of the parts’ surface is well. Make precisely outline and tool wear is small, overcome the drawbacks of CNC system, get a higher efficiency.
Microstructure and Property Control of Hot Rolled DP600 Steel
Authors: Zhou Le Yu , Liu Ya Zheng , Yang Lian Hong , Zhang Dan
Published: December 2011

Thermal mechanical experiment of step-cooling of 600MPa hot-rolled DP steel after compressed was carried out on Gleeble-1500 thermal mechanical simulator, using design of butterfly-shaped sample. Microstructure evolution during step-cooling and its effect on mechanical property of tested steel were analyzed. It is shown that, dual phase microstructure which martensite islands disperses in fine grain ferrite matrix is obtained by holding for 8~10s at 670°C followed accelerated cooling to 200°C. With increasing of holding time, grain size of ferrite coarsens, and volume fraction of ferrite has few changes. Meanwhile, tensile strengths of tested steel are all near 600MPa. That is to say, ferrite transformation is adequate during holding for 8~10s at 670°C and tensile strength of dual phase steel is stable accordingly.
Performance Characteristics of the Steels for High-Rise Buildings
Authors: Yu Qing Bo
Published: December 2011

With the development of high-rise buildings, the requirement to the performance of steels for high-rise buildings keeps on increasing. Besides high strength and high toughness possessed by general structural steels, the steels for high-rise buildings should possess low yield ratio, excellent welding performance, fire-resistant performance and Z-direction performance. These performance characteristics of the steels for high-rise building were introduced and its development trend was pointed out.
Development of Processing Maps for Coiled Tubing Steel
Authors: Zhang Zhen Dong , Zhou Hai Tao , Liu Xiang Hua , Li Si Jun , Dong Jie , Zhou Xiao
Published: December 2011

Hot compression test of coiled tubing steel is performed on Gleeble3500 at 1123K—1373K and strain rate from 0.001 to 5s-1. The hot deformation behavior of coiled tubing steel was characterized using processing map developed on the basis of the dynamic materials model. The processing map gives the flow instable region and the flow stable region in which the process of dynamic recovery (DRV) and the dynamic recrystallization (DRX) occur. In the processing map, the variation of the efficiency of the power dissipation is plotted as a function of temperature and the strain rate. According to the processing map, the coiled tubing steel is rolled by The Thermo-Mechanical-Control-Process (TMCP), and finally it is obtained that the yield strength and tensile strength of coiled tubing steel are 565MPa and 685MPa respectively, and the elongation percentage is 32.1%.
The Effect of Bainitic Transformation on Martensite Start Temperature of a Fe-C-Mn-Si Alloy
Authors: Xu Guang , Zou Hang , Bu Cong Hua
Published: December 2011

The martensite start temperature (Ms) of a Fe-0.40%C-1.87%Mn-1.65%Si alloy with bainite and martensite dual phases was studied. The phase transformation dilation curves were measured and Ms temperatures of deformed and non-deformed specimens were obtained. Finally the effect of bainitic transformation upon Ms was investigated. The results show that bainitic phase transition affects the Ms and the increase of transformation results in the decrease of Ms. The mechanical stabilization of austenite due to ausforming is partially eliminated by bainitic transformation, which weakens the effect of ausforming on Ms.
Development of a Phenomenological Method for Description of Crack Initiation Behavior under Thermo-Mechanical Fatigue Loading
Authors: Cui Lu , Wang Peng
Published: December 2011

Description of crack initiation behavior under thermo-mechanical fatigue (TMF) of modern high chromium steel is prerequisite for design optimization of steam turbine components. In this paper a phenomenological method which envelopes the synthesis of stress-strain hysteresis loops according to cycle counting methods and the individual assessment of creep fatigue damage is extended to TMF with superimposed creep. Recalculation of such service-type experiments on specimen of rotor steel 10CrMoWVNbN shows acceptable results for deformation description and lifetime estimation.
The Analysis of Nitrogen Removal Performance for Eco-Ceramic Concrete Biofilm Reactors
Authors: Shi Ming Yan , Zheng Hai Liang , Liu Jia Yu , Xiao Can Qiang
Published: December 2011

In order to achieve high efficiency of biofilm and removing nitrogen with low consumption, people have developed a new eco-ceramic concrete filler, used for the denitrification in treating municipal wastewater. When the water temperature is 25 ~ 30°C, the pH of influent is 7.0 ~ 7.5, the concentration of DO is 2.5 ~ 3.0mg /L, and the removal rates of COD, ammonia and total nitrogen are 78.6 ~ 91.8%, 83.4 ~93.6% and 63.4 ~ 73.8 % respectively. The removal of the pollutants mainly concentrates on the front and center of the reactor. We can also draw a conclusion from the experiment that, SOUR, the dry weight of biofilm and the thickness of biofilm present a pattern of diminishing along the corridor. The average decreasing ratio of each filler are 0.81%, 1.3% and 1.05%, respectively. And the activity of per unit mass of biofilm has increased along the corridor, and the end of it is 51.5% more than the front, which indicates that the system has good ability of resistance.
The Morphology Evolution of Vapour Phase Aluminide Coating on a CMSX4 Single Crystal Superalloy
Authors: Han Xing Hua , Gariboldi Elisabetta , Longo Giulioantonio , Zanon Giovanni Paolo
Published: December 2011

The effects of diffusion temperature and time on the mechanism of the surface layers formation during low activity vapour phase aluminizing process on a Ni-base superalloy CMSX4 single crystal was experimentally investigated. The coating morphology of as aluminized samples grown along the substrate [100] and [110] directions of the substrate crystal was analysed by means of SEM, EDS and EBSD techniques. The presence of three layers, where β-NiAl differently combines to γ’, γ and TCP phases, was always observed. The β-NiAl phase in particular displayed two different morphologies and textures depending on the interface movement mechanism generating this phase at its external/internal interface. The presence of secondary precipitated phases within the coating layer, their composition and morphology, helped to understand the coating development process. The surface layer formation mechanism was found to be slightly temperature-dependent.
Impact of Shaft Coaxiality on the Local Stiffness of Angular Contact Ball Bearing
Authors: Ye Zhen Huan , Wang Li Qin , Zhang Chuan Wei , Gu Le
Published: December 2011

Semi-dynamic method is employed to calculate the local stiffness of angular contact ball bearing, accounting for the influence of geometrical deflects caused by shaft coaxiality in the process of bearing assemble. The effect of coaxiality on the bearing deflect is computed, and the relationship of local bearing stiffness to coaxiality is analyzed.
A Dynamic Dispatching Method of Resource in Cloud Computing Environment
Authors: Zhao Hong Wei , Zhu Yan Ning , Shao Yi Chuan
Published: December 2011

In order to implement the balanced distribution in Cloud Computing system and to improve the utilization ratio of the resource as well as handling up rate of the system, the system of dynamic dispatching system based on Cloud Computing has been designed and implemented after the study on the Cloud Computing. Firstly, a layered loading balancing scheduling mode has been proposed, providing the structure of the dispatching service system. Secondly, a comprehensive service distribution algorithm has been designed and implemented in consideration of respective local service counts, each join points’ performance, current load distribution and semantic. Finally, the result of the experiment indicates that the scheduling system can improve the efficiency of dispatching service and the utilization ratio in the Cloud Computing system.