bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of a Filler Surface Treatment on the Properties of Conductive Silicone Rubber Filled with Ag-Coated Cu Flakes for EMI Shielding
Authors: Liu Xiao Hei , Xia Zhi Dong , Zhao Meng Ke , Zhou Hu , Li Ying , Xu Guang Chen , Guo Fu
Published: July 2011

One of the main hurdles for the wide use of current Ag-filled conductive composites is the high cost of Ag fillers, while the challenge for low cost copper-filled composites is their poor reliability. In this study, the Ag-coated Cu flakes was chosen as conductive fillers and a surface modification with coupling agent, to achieve good bonding between the flakes and the Polydimethylsiloxane (PDMS) matrix, was applied to improve the mechanical and conductive properties of the PDMS based composites. The resulting composites obtained through modification showed an increase in hardness by 13.1% and tensile strength by 28.4% relative to the composites without coupling agent. In addition, the reliability of conducting composites was discussed and the results showed that the coupling agent played a great role in preventing the corrosion of the exposed Cu during aging. The volume resistivity of the composites, filled with untreated Ag-coated Cu flakes, increased from 0.0039Ω·cm to 0.0059Ω·cm under aging at 85°C and 85% room humidity (RH) in a temperature/humidity chamber for 48 h, in contrary, the volume resistivity shift of the composites with treated flakes was almost negligible, just changed from 0.0043Ω·cm to 0.0045Ω·cm. More importantly, the prepared conductive silicone rubber filled with Ag-coated Cu flakes with the resistivity (0.004Ω·cm) comparable to the relative commercial products can be used for electro-magnetic interference (EMI).
Manufacturing of Functional Gelatin/Chitosan Composite Membrane
Authors: Lou Ching Wen , Hu Jin Jia , Lu Chao Tsang , Huang Chao Chiung , Huang Ming Sheng , Lin Jia Horng
Published: July 2011

Biodegradable materials have gained more and more attention, especially in biomedical fields. Because of their degradability, biomedical products made of these biodegradable materials can reduce the deleterious impact to the environment. Among other biodegradable polymers, gelatin has been used in wound dressing to accelerate wound healing due to its biocompatibility, film formability and hemostatic activity. In this study, we used gelatin as the matrix for our dressing. As gelatin is prone to degrade/dissolve in water at body temperature, it has to be cross-linked or stabilized with other compounds to enhance its lifetime. Chitosan, another biodegradable polymer, is also widely used in wound healing due to its biocompatibility and antibacterial properties. In this study, we mixed gelatin solution with chitosan solution at a variety of ratios and tested the effectiveness of UV irradiation on cross-linking the two polymers. The composite membranes were fabricated and underwent tests of swelling, stability in water, water contact angle to evaluate their stability and hydrophilicity. Our results showed that the composite membrane made of gelatin/chitosan (90:10) treated with UV irradiation for ten min has the optimal stability in water.
Kinetic Study of Nitrite Removal from Municipal Wastewater Using Ion Exchange Resins
Authors: Sica Mihaela , Draghici Camelia , Duta Anca , Teodosiu Carmen
Published: July 2011

Nitrite removal from municipal wastewater is mandatory considering the treated wastewater reuse. Removal on an anion exchanger leads to simple wastewater treatment installations, easy to handle, to exploit and to maintain. This study reports on the performance of anion exchange resin on removing nitrite from synthetic solutions. Equilibrium data could be well fitted using the Langmuir model, confirming ion exchange without any parallel mechanisms. Kinetic study of the process is evaluated using the shrinking core model and the dominant rate mechanism is estimate.
Impact of Impurities in Metallurgical Grade Silicon on Removal Efficiency of Vacuum Evaporation
Authors: Wei Kui Xian , Ma Wen Hui , Zhou Yang , Xie Ke Qiang , Yang Bin , Liu Da Chun , Dai Yong Nian
Published: July 2011

Vacuum evaporation is usually utilized to remove volatile impurities in metallurgical grade silicon to prepare solar grade silicon by metallurgical routes. Especially phosphorus needs to be removed by vacuum evaporation. And the removal efficiency of impurities strongly influenced the quality and performance of products. In this paper, the removal efficiency of impurities is studied by using different raw material. The results indicated that the content of impurities in raw material had deep effect on the removal efficiency of vacuum evaporation. The high quality product can be obtained by vacuum evaporation only once from raw materials with the lower content of impurities whereas it is not for high content of impurities in raw material. This is due to the vapor-liquid equilibrium in the vacuum furnace. The impurities can be removed effectively by vacuum evaporation many times.
Synthesis of Sn4+ Doped TiO2 Nano Powder and its Photocatalytic Activity
Authors: Dong Hong Ying , Huang Kai Ming , Teng Ying Yue , Ren Yan Ping , Jia Zhi Cheng , Cao Zhen Zhu , Ma Wen
Published: July 2011

TiO2 nano powder doping with Sn4+ was directly synthesized by a low temperature hydrothermal method using tetrabutyl titanate (TBOT) as a Ti resource and NH4Cl as a dispersant. The synthesized nano powder was characterized by XRD, BET, TEM and EDS analyses. XRD results show that increasing reaction temperature facilitates to form a stable phase, and the synthesized nano power size is uniform with particle size of 10-20 nm. Doping Sn4+ ion does not result in an obvious lattice distortion. The effect of doping Sn4+ ion on photocatalytic activity in visible light region for modified TiO2 was investigated bydegrading methylene blue solution.
Preparation of CNTs/TiO2/CS Film and its Photocatalytic Activity
Authors: Zeng Li Ping , Zhang Quan , Zhang Guo Qiang , Zou Li Hui
Published: July 2011

In this work, carbon nano-tube/TiO2 (CNTs/TiO2) nanocomposites were prepared using a conventional sol-gel method. To further obtain a uniform catalyst film, chitosan (CS) was used as a crosslinker for the CNTs/TiO2 composite. The structure and property of CNTs/TiO2/CS film were characterized using XRD, FT-IR, TEM, SEM, and UV-vis. The photocatalytic activities of CNTs/TiO2/CS film were measured through the photocatalytic degradation of gaseous formaldehyde. Compared with the commercial TiO2, higher degradation was achieved with the CNTs/TiO2/CS film due to stronger absorbability and synergetic effect among CNTs, TiO2, and CS.
Research for Use Diamond Knife to Ultra-Precision Boring Gauging Pump’s Boring
Authors: Shi Jian Ru , Pei Shao Jing , Cui Jiang Hong , Chen Jian Fei , Wang Li
Published: July 2011

In this thesis, the new process will proposed which using diamond profile boring to boring 8-shaped hole in intermediate stainless steel plate of synthetic fiber gear pump. Academic analysis was made for gear pump’s flow rate, and analysis was made for the disadvantage of using brown alumina grinding wheel to grinding 8-shaped hole in intermediate plate’s internal surface. The critical technical of single crystal diamond’s material selecting, grinding, welding were solved, and diamond profile boring was designed and manufactured. We confirmed the boring parameters: “”, “” and “” through experiment and academic analysis. The qualified intermediate stainless steel plate with 8-shaped hole was using in one spinning factory; we conquered the grinding hole’s disadvantage and productivity is increasing 15 times.
Preparation and Characterization of Rare Earth Solid Superacids SO42-/TiO2-SnO2-Dy2O3
Authors: Guo Hai Fu , Li Xiang , Chen Zhi Sheng , Yan Peng , Li Shu Min
Published: July 2011

A new rare earth solid superacids catalyst SO42-/TiO2-SnO2-Dy2O3 was prepared by coprecipitation-impregnating method, and the optimum preparation conditions were obtained. The physic- chemical properties of the catalyst was characterized by FTIR, TG-DTA, XRD and BET. The results showed the prepared catalyst is superacid with good thermal stability and high specific surface area. The sulfuric groups were proved to be chelated and bridgingly connected on the surface of the catalyst.
Determination of the Presence of Composite Ions in Catalysts and Composite Ionic Liquids-Catalyzed Isobutane Alkylation
Authors: Cong Ying Nan , Liu Ying , Hu Rui Sheng
Published: July 2011

A novel and efficient method was established to investigate isobutane/2-butene alkylation. In this method FT-IR spectroscopy was used to determine the presence of the composite ion (AlCuCl5-) in the composite ionic liquid (CIL). The trimethylpentane selectivity of the composite ionic liquid for isobutane/2-butene alkylation was also estimated by monitoring the shift of IR absorption bands in the range 1636–1685 cm-1. A detailed study of the alkylation of isobutane /2-butene in CIL media has been conducted using 1-alkyl-3-methylimidazolium halide/X aluminum chloride-y cuprous (I) chloride ([CnMIM]Cl/xAlCl3-yCuCl) encompassing various alkyl groups (n=4:B, butyl-, n=6:H, hexyl-, and n=8: O, octyl-)respectively. The ionic liquids showed higher selectivities of C8 as well as the TMP/DMH ratios in alkylates. The better catalytic performance of CIL can be attributed to the presence of the composite ion in it, and the catalytic performance of the chloroaluminate ionic liquid can be indicated by the 1685 cm-1 band of FT-IR spectroscopy.
Influence of Resin on the Performance of Water-Based Plastic Gravure Ink
Authors: Yu Mao Jie , Huang Bei Qing , Wei Xian Fu
Published: July 2011

Resin as an important part of water-based plastic gravure ink which directly affect the performance of ink. In order to improve the performance of water-based plastic gravure ink，fixing other components and changing the type of resin to prepare ink. Viscosity of ink was measured. Proof the ink on PET film and the effect of resin on water-based plastic gravure ink was inspected through measuring adhesion, wear resistance and glossiness of the ink. The results indicate that water-based plastic gravure ink was prepared by acrylic resin S-2661D has low viscosity, high glossiness; water-based plastic gravure ink was prepared by acrylic resin 2661-91-3 has better ink adhesion, wear resistance performance.
The Effect of Barium Modification on the Sulfur Tolerance of Methane Catalytic Combustion over PdO/Al2O3 Catalysts
Authors: Ma Lei , Xie Ping , Lu Dian Qiao , Lu Chun Shan , Zhang Qun Feng , Li Xiao Nian
Published: July 2011

The sulfur tolerance over palladium supported on pure alumina and on alumina modified with barium of catalytic combustion of methane is investigated. Characterization of the catalysts is performed by, XRD and H2-TPR techniques. Barium nitrate as the precursor to the formation of Ba(NO2)2 species can inhibit the SO2 and SO3 overflow from Al2(SO3)3 and Al2(SO4)3 sulfate to the adjacent PdO. Ba content on the performance of the catalyst resistance to sulfur poisoning has important implications. 0.7% Ba-1% Pd/Al2O3 catalyst resistance to sulfur poisoning property is close to that of high load capacity 5% Pd/Al2O3 catalyst.
Synthesis and Characterization of Flower-Like Hematite Nanostructures
Authors: Wang Hong , He Xi Yang , Wang Ying
Published: July 2011

The flower-like α-Fe2O3 superstructures were fabricated by a novel hydrothermal route and sequential annealing at 600 °C for 1 h using FeCl3×6H2O as the starting precursor. The structures and morphologies of the synthesized flower-like superstructures have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM). It is revealed that the flower-like α-Fe2O3nanostructures consist of nanorods with the average diameter of about 70 nm and an average length of about 200nm growing from the centers. The critical role of urea in the hydrothermal synthesis of the flower-like nanostructures is discussed.
Synthesis of Bis-Indolylmethanes Containing 1,2,3-Triazolyl Catalyzed by Brønsted Acidic Ionic Liquid under Solvent-Free Conditions
Authors: Zhang Yong Hong , Lei Zhen Kai , Huang Xiang Ju , Pan Xiao Yu , Zhao Xin Hai , Liu Chen Jiang
Published: July 2011

A series of novel bis-indolylmethanes containing 1,2,3-triazolyl have been synthesized from the reaction of indoles with 4-formyl-1,2,3-triazole catalyzed by Brønsted acidic ionic liquid [PyNCH2CO2H][HSO4] under solvent-free conditions. The satisfactory results were obtained with excellent yields and short reaction time in the experimental procedure.
Investigation of Biocomposites Containing Glycerol-Plasticized Soy Protein and Kaolin
Authors: Tian Hua Feng , Xu Guo Zhi , Yang Biao
Published: July 2011

A series of soy protein/kaolin nanocomposites have been successfully prepared via solution mixing and then extrusion. The structure and the properties of the nanocomposite plastics were characterized by wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), water uptake as well as mechanical testing. WAXD revealed that the nano-sized kaolin filler in soy protein matrix retained the original structure as the pristine kaolin. In view of the results of SEM, kaolin distributed in the protein matrix homogeneously and exhibited fine adhesion with soy protein. The incorporation of kaolin into glycerol-plasticized soy protein led to great improvements of mechanical and water resistant properties. The thermal stability was also enhanced by the incorporation of kaolin as revealed by TGA characterization.
Influence of Oxide Doping on Co3O4-CeO2 for CO Oxidation
Authors: Cai Jian Xin , Lv Yi Hao , Zhang Rong Bin , Luo Lai Tao
Published: July 2011

Ce0.7M0.3CoOx catalysts were prepared by polyatomic alcohol method. The crystal structure, reduction and adsorption properties, and specific surface were investigated by XRD, TPR, TPD, BET, respectively. The results show that catalysts doped with different oxides can make great effects on the catalytic properties of the Co3O4-CeO2. The interaction between doping oxides (SrO, NiO, La2O3, ZrO2, Nd2O3) and Co3O4-CeO2 is contributed to the change of the reduction and adsorption performance, and specific surface area of the catalysts. SrO doping can promote CeO2 reduction, CO adsorption and low-temperature oxidative activity of the catalysts. The conversion of CO can reach 100% over the Ce0.7Sr0.3CoOx at 120 °C temperature.
Analysis of a Magnetorheological Transmission for Fan Clutch
Authors: Huang Jin , Fu Li Juan , Zhong Li Rong
Published: July 2011

A magneto-rheological (MR) fan clutch is a device that transmits torque by the shear stress of the MR fluids. In this paper, the torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the disk-type MR fan clutch. The results show that with the increase of the applied magnetic field, the torque developed by MR fluids goes up rapidly. The driven speed of the fan clutch can be adjusted continuously by changing the applied magnetic field.
The Preparation of C, N, S Tri-Doped TiO2 and Visible-Light Photo-Degradation of Methylene Blue and Dyes
Authors: Shi Yi Dong , Guo Qiong , Xie Yuan Song
Published: July 2011

The C, N, S tri-doped TiO2 with high visible-light photo-catalysis effect was successfully prepared by mixing thiourea with the self-prepared TiO2 powder through calcining for 2h at 450°C. The TiO2 powder was obtained by homogeneous precipitation method using the metatitanic acid instead of expensive chemical reagents contained Ti as raw material. The effect of doping materials and methods on the photo-degradation rate of methylene blue and dyes was studied. The characterizations of the doped TiO2 were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-visible absorption spectra (UV-vis). The results showed that this sample was the anatase TiO2 and contained elements C, N, S. The sample exhibited a significant response to ultraviolet and visible light. In the photo-degradation experiment, the C, N, S, tridoped-TiO2 could decolorize methylene blue and textile dyes quickly, and the photo-degradation rate of methylene blue could reach upward 98% after 3 hours under the different light sources.
Research on the Technical Conditions on Synthesizing Calcium Zirconate Material
Authors: You Jie Gang , Zhang Guo Dong , Qu Dian Li
Published: July 2011

The synthesizing CaZrO3 are prepared with fused zirconia powder (0.044mm), monoatomic zirconia powder (0.044mm), desilication zirconia powder (0.044mm) and calcium oxide powder (0.044mm). The effect of different moulding pressure and firing temperature on synthesizing CaZrO3 has been studied in this paper. The test results show that: The impurity composition SiO2 and Al2O3 in raw material have participated in reaction, and generated liquid, accelerated transmission quality speed of reaction. Desilication ZrO2 is the best ZrO2 raw material to synthesizing CaZrO3 in above three ZrO2 raw materials, firing temperature markedly influence the synthetic rate of CaZrO3, but moulding pressure is not this. Desilication ZrO2 and CaO as raw material, firing 1600°C for 3h, pressure at 160Mpa and one stage burning process are the best technical conditions to synthesize CaZrO3.
Study of Crack Resistance Property of Polyvinyl Alcohol Fiber Reinforced Concrete
Authors: Xiao Kai Tao , Li Jia Zheng , Yang Hua Quan
Published: July 2011

The strength, ultimate tensile value, compressive elastic modulus and drying shrinkage of polyvinyl alcohol fiber reinforced concrete were studied by tests, and its crack resistance property was also studied by plate method and temperature stress testing machine. The test results showed that PVA fiber could improve the tensile strength and ultimate tensile value of concrete, lower its compressive elastic modulus and drying shrinkage, restrain its early plastic shrinkage and drying shrinkage cracks, reduce its cracking temperature and improve the crack resistance property of concrete, moreover, the effect of long PVA fiber was better.
Electrochemical Reduction of Nitrate by Fe-Si Alloy Electrode
Authors: Li Min , Sun Yan Zhi , Li Cai Ying , Wan Ping Yu
Published: July 2011

The present paper studies the removal of the nitrogen in the form of nitrate in water by electrochemical catalysis reduction. The influence of electrode materials and various test conditions on the removal efficiency was studied. The experimental results show that the removal rate of nitrate can reach above 90% by using a three-dimensional permeable electrode of Fe-Si alloy under the condition of flowrate of 600ml/h, current density of 10mA/cm2 and reaction time of 2h.
The Performance of Low-Heat Accumulation Asphalt Mixture and the Evaluation Model of its Thermal Effect on Cities
Authors: Xie Jian Guang , Yang Zhao Xu , Fang Xiao Qing , Hu Ye
Published: July 2011

A new type of low-heat accumulation asphalt concrete material has been made to reduce urban surface temperature and to ease the urban heat island effect. The test has investigated the temperature reduction performance and pavement performance, established a non-gray model of the atmospheric temperature field, and evaluated its effect on the urban thermal environment. The results show that compare specimens mixed with infrared powder with normal ones, the higher the infrared powder content, the lower the surface temperature, but the cooling rate decreases; the properties of high-temperature stability, low-temperature stability and water stability are improved; under the same temperature and humidity conditions, the surface layer temperature of the former pavement is lower generally; under the same radiation conditions, the surface equilibrium temperature of the former ones is 8.12K lower, which can reduce the near-earth atmospheric temperature and ease the urban heat island effect.
Effect of Oxide Buffer Layers on the Optical and Electrical Properties of Ga-Doped Zinc Oxide Thin Film
Authors: Gil Byung Woo , Lee Sung Eui , Lee Hee Chul
Published: July 2011

The effects of oxide buffer layers on the optical and electrical properties of sputtered Gallium-doped zinc oxide (GZO) films were intensively investigated for developing the electrodes of photonic devices, which demand high optical transmittance and low resistivity. The use of Al2O3 and SiO2 buffer layers could increase transmittance of GZO films to 90.69% around the wavelength of 550 nm by controlling the optical spectrum. The resistivity of the deposited GZO films was much dependent on the deposition condition of O2 ratio during buffer layer deposition. It is considered that the carrier mobility of GZO films on SiO2 buffer is highly related to the lattice crystallinity of SiO2 and GZO films. In contrast, on the Al2O3 buffer layer, rough surface morphology could increase the resistivity of GZO films due to the doping effect of diffused Al atoms.
Synthesis and Characterization of New Kinds Sulfoxide Extractants for Palladium(II)
Authors: Chen Li Li , Qiu Zu Min , Huang Zhen Zhong , Wu Yan Fen
Published: July 2011

Three new extractants for palladium(II) extraction: bis(noctyl-Sulfinyl-ethyl) ether(L1), bis(isooctyl-Sulfinyl-ethyl)ether(L2), bis(isooctyl-Sulfinyl-ethoxy)ethane(L3) were synthesized. Micro-analytical data, elemental analysis, 1HNMR and IR-spectra were used to confirm the structures. Based on independent extraction experiments of Pd(II) , the extraction parameters of Pd(II) were studied in detail, and the optimal extraction parameters were obtained and summarized as the following: H+ concentration of aqueous phase 1.0-1.5 mo1·L-1, sulfoxide extractants concentration 0.01-0.1 mo1·L-1. The order of the extractability of the three extractants towards palladium(II) was L2>L3>L1. The coordination number was studied by the slope method. The results indicated that, in low acidity, the coordination number for extracting palladium (II) was 1.0 with all three extractants, while it was 2.0 in high acidity. FT-IR spectra was used to analyze the structure of the complex. Palladium (II) was coordinated with the oxygen atom in S=O group of the three extractants. and palladium (II) may also coordinated with the oxygen atom in C-O-C group of extractant L1, L2.
Synthesis of Mn and Se-Doping TiO2 Mesoporous Materials and their Antibacterial Efficacy under Visible Light Irradiation
Authors: Chu Sheng , Zhu Hao Yue , Xue Min , Luo Lei Lei , Kong Fei , Wang Ying , Zou Zhi Gang
Published: July 2011

Two kinds of visible light driven mesoporous structured Mn and Se-doping TiO2 nanocrystal photocatalysts have been synthesized through a modified sol-gel method, and N2 adsorption-desorption isotherm confirms that the mesoporous materials possess large pore size and narrow pore size distribution. X-Ray powder Diffraction (XRD) analyses reveal that the doping of Mn and Se inhibits the growth of TiO2 anatase nanocrystal and the Mn species are higher dispersed on the surface of TiO2. Ultraviolet (UV)-vis spectrum demonstrates the excellent adsorption property of Mn doping TiO2 for visible light region, which enables this novel photocatalysis material to possess remarkable activity in photocatalytic antibacterial for E. Coli. bacteria under visible lights radiation.
Study on the Characterization of Fe- Ti Modified Bentonite and Its Influence on Absorption Performance of Wastewater
Authors: Shao Hong , Zhang Di
Published: July 2011

In the treatment of wastewater, the Fe- Ti Modified Bentonite was prepared as a new type of absorbing material which raw material was sodium bentonite. The Fe- Ti Modified Bentonite was used in the simulation wastewater which included Cr6+ and organic matter. The best adsorption condition was ensured by the pH value, the dosing quantity and the absorption time. The results of these experimental dates showed that the Fe- Ti Modified Bentonite had an excellent absorption performance and was much better than the sodium bentonite. The removal rate of Cr6+ and COD were 98.56% and 78.23% respectively if the pH value was 3, the dosing quantity was 10 g/L , the absorption time was 30 minutes. The results also showed that the distance of the modified bentonite was changed because the cross-linking agent entered the layers structure. That was why the absorption performance of Fe- Ti Modified Bentonite was improved.
Effect of CeO2 Deposition Temperature on the Properties of Tl-2212 Superconducting Films Grown on MgO Substrates
Authors: Xie Qing Lian , Huang Guo Hua , Pan Yin Song , Ji Lu , yue hongwei , Zhao Xin Jie , Fang Lan , Yan Shao Lin
Published: July 2011

The preparation and superconductivity of Tl-2212 films grown on CeO2-buffered MgO substrates were investigated. AFM showed that the annealing of MgO substrates remarkably improved their crystal quality of surface layers, and led to the surface morphology of substrates evolving into unattached outgrowth structure with ultra-smooth surface. XRD measurements showed that CeO2 buffer layers grown on MgO annealed at the suitable conditions were pure (00l) phase. The 500 nm thick Tl-2212 films grown on these CeO2 films subsequently possessed excellent c-axis orientation and superconductivity. The best Tl-2212 film reached a low surface resistance of about 324 μΩ (10 GHz, 77 K), a critical current density as high as 3.5 MA/cm2 (77 K, 0 T) and a critical transition temperature of about 108.4 K.
Experimental Study on Seismic Performance of Tall Building Structure of Concrete Filled Steel Tube (CFST) with Transfer Story
Authors: Chen Bo Wang , Oyang Yang , Tan Jian Guo
Published: July 2011

The seismic performance test of the model CFST tube structure with transfer story has been finished. The model with 13 floors and with a scale of 1:10 consists of an outer-tube and an inner-tube. The former is a framed tube supported on CFST frames and the latter is an RC tube. A series of seismic performance tests of the model, which is equivalent as two degrees of freedom system, on acceleration earthquake waves in four cases (0.22g, 0.4g, 0.62g and 1.0g) have been fulfilled. The experiment has illustrated that the CFST tube structure is an outstanding structural style with excellent anti-seismic behavior.
Reflected Amplitude of Elastic Wave at Free Surface
Authors: Yang Xue Ying , Zhang Bo , Zhang Dun Fu
Published: July 2011

The analytic solution of incident P wave, SV wave and SH wave amplitudes reflected at free surface in elastic medium was presented in this paper. Taking the assumption that the wave propagation media are in elastic half space and the seismic wave is plane simple harmonic wave, the incident wave and reflected wave functions of P wave, SV wave and SH wave were deduced with elastic wave theory, and the wave amplitudes reflected at free surface in elastic media was presented
An Evaluation on the Width-Thickness Ratio of the Rotation Capacity of HSB800 Steel Flexural Members
Authors: Moon Ki Hoon , Han Sang Whan , Rew Younho
Published: July 2011

The width-thickness ratio of the rotation capacity of the HSB800 steel flexural members are evaluated in this study. First of all, the properties of high-performance steel are analyzed from the tension coupon test - SS400, SM490, HSB800. By the result, high-performance steel have the three properties - the high yield ratio, the low modulus of elasticity strain-hardening, and the low strain at tension stress. The rotation capacity of the HSB800 steel flexural members are evaluated using F.E. program. By the F.E result, the HSB800 steel flexural members are not satisfied in the current code that rotation capacity, R>3 in compact section. Based in the experiment and theories, this study suggested limiting the width-thickness ratio of HSB800 steel satisfied in the current code. So, the limitation of width-thickness ratio of the HSB800 steel are conservative than the width-thickness ratio in the code.
Pushover Testing of Circular Adobe Structure
Authors: Jinwuth Watcharin , Samali Bijan , Wang Cynthia
Published: July 2011

Many unreinforced adobe or mud-brick structures have in the past suffered severe damage from seismic forces and have caused a vast number of deaths. In contrast, some adobe buildings located in seismic regions have performed well under several seismic events. Researchers noticed that most existing circular adobe houses performed well in withstanding earthquakes even though some did not have any additional ductile reinforcement. This paper presents the investigation of seismic performance of unreinforced circular adobe buildings using static pushover testing. A scaled model (1:3 scale) of adobe circular structure were built and tested by static lateral load and pushed to total collapse. The results presented in the form of capacity curves, are compared with the expected lateral loading obtained from the static tilt testing carried out in earlier research. The outcome of this research can be used to evaluate the existing circular adobe houses and can give design recommendations of suitable configurations for new circular adobe buildings.
The Application of Radiation Technology in the Field of Medical Biomaterials
Authors: Jin Huan Yu , Yin Hua , An Yan
Published: July 2011

The radiation technology has been applied extensively in the field of biological engineering, tissue engineering, medical practices and so on. It also plays an important role in the sterilization and modification of biomaterials. This work reviews recent development of several types of radiation technology which have been applied in the field of medical biomaterials.
Effect of Sintering Aid on Microstructure and Mechanical Properties of TiB2/TiN Tool Materials
Authors: Gu Mei Lin , Zhang Jian Hua , Wei Zhi
Published: July 2011

TiB2/TiN composites with various content of Ni and Mo as sintering aid were hot-pressed at 1530°C. Effect of the content of sintering aid on microstructure and mechanical properties is investigated. Experimental results show that the fracture toughness of the composites increases consistently with an increase in the sintering aid content, however, the flexural strength gets to the maximum when the content of sintering aid is 10vol%. A new eutectic phase of MoNi can be found in the composites by X-ray diffraction (XRD) when the amount of sintering aid is over 7vol%. Scan electron microscope (SEM) analysis shows that the density of the composites increases consistently with the increasing of the sintering aid. But the abnormal-growth grains can be found and deteriorates the flexural strength in the composite No.4 because of the excessive sintering aid.
Study on Laccase Immobilization with PVA Materials
Authors: Du Fei , Li Zhi Jiang , Zhang An Long , Qi Qiang
Published: July 2011

This article used glutaraldehyde to immobilize laccase and then used the immobilization laccase to treatment papermaking effluent. The study first discussed the effect of PVA crosslinking degree, epoxidation temperature and epoxidation time for the performance of PVA carrier. The research found 100g PVA ( mass fraction is 10%), 35mL glutaraldehyde, 10mL DMSO and 10mL epoxy chloropropane reacted 6h in 60 °C, pH=11-12 and surface amount of epoxidation reached the max value. its amount is 0.3073mmol . And then the laccase were fixed with the max value. The optimum conditions of immobilization laccase treated papermaking effluent were researched. The effects of treated time, temperature, pH value, the dosage of enzyme and HBT, the removal value of CODCr and decolorization were tested. The effects of treated time, temperature, pH value, the dosage of enzyme and HBT, concentration of Cu2+ on the removal value of CODCr and decolorization were tested. It was found that the optimum conditions for immobilization laccase treatment were Cu2+ 0.006μmol/L, HBT 0.008g/L, pH=4, temperature 50°C, reation time 6h (with air injected). The result showed that the CODCr removal rate reached 63.15%, the decolorization rate reached 61.53% in 8h. Furthermore BOD/COD of chemical pulp effluent was increased from 0.17 to 0.455. Comparing with dissociation laccase, stabilities of immobilization laccase for hot and pH increased. Through this research a new advanced treatment method can be found. This method can improve biodegradation performance of papermaking effluent. Papermaking effluent treated by aerobic, anaerobic and laccase system will achieve standard discharge.
The Influence of Different Carbon Sources to γ-PGA’s Molecular Weight Distribution
Authors: Wu Jian Guang , Gu Jin
Published: July 2011

Poly (γ-glutamic acid) (γ-PGA) is a special anionic, water-soluble and high viscous polymer [1] which is condensed by glutamate via amide linkages between their a-amino and γ-carboxylic acid groups [2]. For its excellent characters, potential applications of γ-PGA have been of interest in the past few years in a broad range of industrial ﬁelds [3]. And the decision to application of γ-PGA will be done, depending on its’ molecular weight. So this article main expresses the influence of different carbon sources to γ-PGA’s molecular weight distribution. By SDS-PAGE, we found that the molecular weight distributions of biosynthetic γ-PGA were different in the different carbon sources. All the results showed that changing the carbon source of mediums did make the biosynthetic γ-PGA’s yield and molecular weight distribution been changed.
Controlled Release of Aspirin from SiO2-PEG Hybrid Coating on 316Lss Substrate for the Preparation of Drug Eluting Stents
Authors: Jian Min Kun , Chen Wen Ping , Feng Miao , Zhan Hong Bing
Published: July 2011

Despite drug eluting stents (DESs) have revolutionized the interventional cardiology over the past decade since the first DES became commercially available nearly a decade ago, burst release of loaded drugs and late thrombosis caused by polymer coatings of the stents are high concerned. In this situation, inorganic coatings, such as silica-based hybrid materials, have aroused researcher’s interest. In this study, aspirin (ASA) was incorporated into the sol-gel derived silica matrix with polyethylene glycol (PEG) as an organic modifier to improve the flexibility and extensibility of the inorganic matrices. We also used L-3,4-dihydroxyphenylalanine (L-DOPA) as a bio-adhesive reagent to enhance interface adhesion between the coating materials and the 316L stainless steel substrate. The results show that the introduction of D-LOPA can greatly improve the coating quality by enhancement of uniformity and adhesion. The loading ASA was slowly released from the coatings and burst release was effectively inhibited owing to the encapsulation of ASA molecules in the silica-PEG matrices.
Mechanical Properties and Rheological Behavior of Injection Moulded Foaming Bamboo Powder–Polypropylene Composites
Authors: Zhou Xia Xing , Lin Qiao Jia , Chen Li Hui
Published: July 2011

Foamed composites of polypropylene containing bamboo powder were prepared using an injection moulding process. Measurement of density, flexural, tensile and notched impact properties of the prepared composites was carried out. Water absorption of the composites was investigated. The rheological behavior of composites was also investigated by rotary rheometer. The density of microfoamed composites was reduced by about 14%.When the bamboo powder was 50 phr (33.3% by weight), the integrated property was best ; the density was 0.886 g·cm-3 and the flexural, tensile and notched impact strength were 58.72 MPa, 30.86 MPa and 5.246 KJ·m-2 respectively; and the thickness swelling and water absorption were 1.31% and 0.7% after duration of 240 h. The results pointed out the composites showed a flow behavior of pseudoplastic fluid; the storage modulus and loss modulus increased and loss tangent decreased with the increase of bamboo powder content. The composite had a typical shear thinning characteristic and the complex viscosity increased with the content of bamboo powder increased.
Preparation and Application of Picroside II Molecularly Imprinted Ploymer for TCM Researching
Authors: Liu Qing Shan , Liu Rui , He Hong Min , Cui Jian , Pang Zong Ran , Yin Xiao Ying
Published: July 2011

PicrosideⅡ, one of the most effective components extracted from picrorhiza, has been reported with neuronal protective activity. To isolate the picroside Ⅱ and similar structure moleculars from picrorhiza effectively, molecularly imprinted polymer (MIP) was prepared by precipitation polymerization with Picroside Ⅱ as template molecule and TRIM as cross-linkers. The MIP was with high affinity and excellent stereo-selectivity toward Picroside Ⅱ and similar structure molecular. The purity of picroside is 70% of target sample. This research might offer a novel method for the enrichment and determination of target compounds from the Traditional Chinese Medicine. A model of middle cerebral artery occlusion and reperfusion (MCAO/R) in rats was used to determine the protective effects of Picroside II sample of this experiment on cerebral ischaemia/reperfusion in vivo. Results indicate the picroside II sample can protect neurons against acute ischemic stroke injury, and the neurological deficit scores of dosage group is lower than that of model group.
Investigation on the Novel Technology of the Fine Inclusion Removal due to the Dispersed In Situ Phase Induced by the Composite Ball Explosive Reaction
Authors: Fei Peng , Wang Xiao Feng , Lin Yang
Published: July 2011

The production of high purity steel is a major task for the iron and steel enterprises in the 21st century. To improve the quality of steel products and produce the cleanness steel, the key technique is to control inclusions in the molten steel. In the present investigation, a novel fine inclusion removal technology due to the dispersed in-situ phase induced by the composite ball explosion reaction was put forward. A composite ball with this function has been designed and the industrial experimental investigation was also carried out. The results indicate that feeding composite ball in RH ladle is a novel technology and the inclusion in the molten steel can be removed effectively. Compared with conventional inclusion removal technology, the number of the oxide inclusion can be decreased to a lower level and the inclusion size becomes much finer. Using this novel technology, the total oxygen in the as-cast slab can approach to 6ppm. This novel technology can be achieved without special facility and be realized in most steelmaking plant.
Thermal Expansion Anisotropy of Cordierite Crystal
Authors: Yang Dao Yuan , Zhu Kai , Wu Juan , Wei Guang Hui , Liu Jing Wei
Published: July 2011

Cordierite material was prepared by talc, bauxite and kaolin, and the coefficient of thermal expansion (CTE) of cordierite crystals could be determined by high temperature X-ray diffractmeter: the volume and average liner CTE is 2.31×10-5°C-1 and 0.84×10-5°C-1 (200°C -800°C) respectively; With the temperature increasing, the CTE in a or b axis direction increases, and in c axis direction decreases rapidly below 400°C then slowly, cordierite crystal is of obvious thermal expansion anisotropy. The orientation of crystal in sample is random, expansion and shrinkage partly counteract, so that the CTE of cordierite materials is low.
Fabrication of Sandwich-Like Hydroxyapatite-Al2O3-Si(100) Biocomposite
Authors: Wu Zhen Jun , Yuan Jian Min , Li Wen Sheng
Published: July 2011

A novel composite biocoating of hydroxyapatite(HA)/Al2O3 has been successfully prepared on Si(100) substrate by a hybrid technique of physical vapor deposition (PVD), anodization, and electrodeposition. The fabricated composite biocoating was also annealed under temperatures ranging from 573 to 973 K. Scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD) were employed to investigate morphologies and compositions of the HA/Al2O3 composite biocoating. It is found that Ca-deficient hydroxyapatite (CDHA) coating holding a Ca/P atomic ratio of 1.61 has been directly electrodeposited onto porous anodic Al2O3 with 1.5~3 μm pore diameter formed by anodization of PVD-deposited aluminum layer on Si(100) and subsequent pore-widening. The embedding of HA outer coating into porous anodic Al2O3 results in a sandwich-like structure in the finally obtained HA/Al2O3 composite biocoating on Si(100). XRD results indicate the decomposition of HA into β-TCP at an annealing temperature above 873 K.
The Use of 15N to Measure N2-Fixing Effectiveness of Rhizobium leguminosarum Strains
Authors: He Ya Hui , Huang Gao Bao , Guo Li Zhuo
Published: July 2011

Biomass, N derived from BNF, total N and Ndfa % of different part tissues of pea plants inoculated with various Rhizobium. leguminosarum strains were determined. Particularly identified were whole plant biomass correlated with N derived from BNF. The significant direct correlations between biomass and N derived from BNF indicated that N-fixation efficiency of strains are important factors influencing biomass accumulation of plants, but not the sole factors determine the promoted capacity of strain on plant biomass production. Different strains show various performances on accumulation of biomass in different parts of plant tissue, R. leguminosarum SY12 performed best on promotion of kernel production. In order to obtain aimed strain with particular property such as promotion of kernel production, the 15N tracing technique can be used in R. Leguminosarum strains screening of R. Leguminosarum, but the analysis both separate part and whole plant tissue are necessary.
Anti-Inflammatory Property of Biomaterial Carotenoids Production by Rhodobacter Sphaeroides WL-APD911
Authors: Wu Wen Tung , Liu Wen Sheng
Published: July 2011

A Rhodobacter sphaeroides WL-APD911 with the capability of producing the end products of neurosporene and ξ-carotene, rather than the normal end products of spheroidene, was isolated from hundreds of strains by using chemical mutagenesis. The strain WL-APD911 grew well in LB medium, and the colored carotenoids were produced within 3 days of incubation at 30°C. The Rs-M of colored carotenoid extracts obtained from strain WL-APD911 by using methanol extraction inhibited the NO production and iNOS expression by LPS-induced RAW 264.7 cells. This probability of reason for the Rs-M as the best source was to prompt the anti-inflammation and anti-oxidation in nutraceutical products. Finally, the carotenoid extracts (Rs-M) with neurosporene and ξ-carotene was called lycogene to be a newly biomaterial.
Synthesis and Characterization of Rodlike Ammonium Tetrathiomolybdate and its Thermal Decomposition Mechanism
Authors: Zhang Jun , Hu Su Ping , Feng Yu Li , Xu Bo , Guo Yan Hui
Published: July 2011

Rodlike ammonium tetrathiomolybdate has been synthesized via ultrasonic assistance using monocrystal ammonium dimolybdate and ammonium sulfide as raw materials. The phase compositions, purity of as-synthesized products were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser Raman spectroscopy(LRS). The thermal decomposition mechanism of ammonium tetrathiomolybdate was deduced by thermoanalysis. It is shown that brownish-red rhombic ammonium tetrathiomolybdate crystal with high purity could be obtained at 60°C for 1h under relatively mild conditions.
Foundations and Advances of Cohesive Mixing
Authors: Yang Ming Jin , Li Xi Wen , Shi Tie Lin , Huang Shu Hong
Published: July 2011

Fluid flow is mathematically expressed as mapping. A dynamic system is strong mixing under certain conditions. The cohesive mixing flow is often in laminar state. By introducing chaos into a laminar mixing system, the mixing performance can be effectively improved. Residence Time Distribution, Lyapunov Exponent, Decay of Correlation, and Mixture Homogeneity are often employed to evaluate the mixing performance of cohesive mixing. New measuring techniques of flow field study, including Particle Tracking Velocimetry, Particle Image Velocimetry, Planar Laser Induced Fluorescence, etc., are quite useful in studying cohesive mixing process. Euler-Lagrange approach and Euler-Euler one are two approaches for modeling and simulation of the cohesive mixing.
Study on Adsorption of Cr(VI) in Wastewater by Powdered Activated Carbon
Authors: Liu Jun Tan , Liu Shi Jing , Gao Huan
Published: July 2011

This research focuses on absorption of Cr(VI) in wastewater by powdered activated carbon, and determines the effect of pH, initial concentration of solution, amount of powdered activated carbon, adsorption time, adsorption temperature, etc, on adsorption of Cr(VI) in wastewater. The results show that the treatment of 100mL containing Cr(VI) wastewater with concentration of 50mg/L will work best in the conditions of 0.35g powdered activated carbon, pH=3.0, 298K, and 1hour oscillatory adsorption.
Research on Application of High Degree of Substitution Cationic Starch in Paper Coating
Authors: Liu Quan Xiao , Li Jin Li , Xu Wen Cai , Lv Yu Bin
Published: July 2011

Different degrees of high degree of substitution cationic starch (HCS) were prepared and applied in paper coating. Effects of HCS on coating properties and coated paper properties were investigated, and the comparison of effects of HCS and PDMDAAC was made. The results show that the best amount of HCS in coating formula is between 2% and 4%. When the amount of HCS is 4%, whiteness of coated paper was the highest. The color density was the highest when the amount of HCS is about 4% and the degree of substitution is 0.64. HCS with degree of substitution 0.849 is better than PDMDAAC in some respects, and the print image density achieved satisfactorily.
Study on Preparation of Calcium Sulfate Whisker with Leaching Tailings of Nickel Ore
Authors: Wang Li , Zhuang Chun Yan , Meng De Qin
Published: July 2011

Taking leaching tailings of the nickel ore as raw material, calcium sulfate whiskers were prepared. The effects of Mg/Ca mole ratio, concentration of sulfuric acid, reaction temperature and precipitating time on the recovery of calcium were studied in this paper. The preparation method and reaction conditions of fibrous calcium sulfate whisker have been optimized by an orthogonal experiment, in order to obtain a high grade whisker product which could meet industrial requirements on whiteness and size.
Simulation and Technological Parameters Optimization of Axial Feeding Bulging Process for T-Tube
Authors: Liu Sheng Jie , Zhang Yan Min , Song Ke Xing , Gao Jian Xin , Zhang Xiao Jun
Published: July 2011

T-tube is widely used in aeronautics and astronautics, pipeline, petrochemical, light industry, automobile, life supplies and so on. The forming process of T-tube is non-symmetric deformed and the material deformation laws are very complicated, so it is quite difficult to machine a produce. In this paper, based on the software ABAQUS, the numerical simulation model was set up and then the high-pressure and axial feeding bulging process of T-tube was simulated. It was analyzed that the main process parameters, such as internal pressure, axial feeding and central punch displacement, had influenced the tube forming quality. The research results show that: (1) The wall thickness of branch becomes thinner and the height of branch does not increase higher in the forming process. (2) With the increment of axial feeding displacement, the wall thickness of tube becomes thicker and the height of branch becomes higher quickly. (3) At the pressure of 110MPa, the wall thickness at the top of branch becomes thinner gradually with the increasing distance between initial position of central punch and tube. (4)When the friction coefficient of surfaces was 0.06 and the ideal branch was produced, the proper parameters of axial feeding bulging processes are as follow: the internal pressure is from 110MP to 120MP, the axial feeding displacement is 14～16mm and the distance between central punch and main tube is from 0mm to 4mm.
Interlayer Structure and Ion-Exchange Properties of Hydrotalcite Intercalated with CO32-, CrO42-, SO42- and NO3-
Authors: Pan Guo Xiang , Xu Min Hong , Chen Hai Feng , Tang Pei Song , Cao Feng , Ni Zhe-Ming
Published: July 2011

A double-sheets model was proposed to investigate the interlayer structure and properties of hydrotalcite (HT) containing CO32-, CrO42-, SO42- and NO3- using density functional theory, and the configuration and distribution of four anions in the interlayer of HT were obtained. The frontier orbital of the host layer interacts with that of the guest anions, and the electron transfers from HOMO of anions to LUMO of the host layer. Moreover, the order in the absolute value of binding energy is: CO32- >CrO42- >SO42- > NO3-, that remains consistent with the ion-exchange ability of HT reported.