bluuebunny/crossref_metadata_2025 huggingface dataset:
Characteristics Analysis and Model Application of Traffic Speed-Volume Relationship in Urban Elevated Roads
Authors: Song Rui , Yan Ke Fei
Published: June 2012

Based on survey data selected from detecting coils locating in Shanghai inner loop elevated roads, speed-volume relationship charts were plotted. Some characteristics were selectively analyzed in certain traffic and road conditions such as traffic speed-volume variety characteristics of different lanes in same road section and traffic speed-volume relationship comparison of same lane in different road sections. Finally, statistics models were built to do further study with application of these traffic characteristics. This study can provide reference for traffic design, management and control projects.
Study on Clustering-Based Location Dependent Query
Authors: Wei Ming Jun , Xia Li Chun , Jin Jian Guo , Fan Qiu Hong
Published: June 2012

This paper firstly analyzes the importance and necessity of location dependent query in the mobile computing. Then, it proposes a special case in the application of the location dependent query. That is as follows: Inquirers may send the same location dependent query in different but similar positions. However, the server will not deal with them together but treat them separately. Thus, it will not only cause the waste of system resources but also delay disposal of other queries. According to the principal of clustering we propose a new location Analysis Algorithms-similar merging location analysis algorithm (SMLA). By the algorithm, similar queries can be combined into the same query, so as to reduce the load on central servers, improve system efficiency and query processing performance.
A Grouping Cache Based Joins Query Algorithm in MANET
Authors: Guo Ya Hong , Liu Xu , Ren Qian Qian
Published: June 2012

Aiming at the problem of joins query in MANET, we proposed a grouping cache mechanism, which builds grouping cache considering the features of data. The proposed mechanism can implement the cooperating cache between groups and update cache information dynamically, which leads to the improvement of query hit ratio and decrease of response time. Based on the grouping cache, a novel joins query algorithm is presented. The algorithm optimizes the query plan using dynamic programming scheme. Then it constructs an optimal execution plan for each sub join query with available cache data taken into account. Simulation results indicated that the group-based cache mechanism can improve the hit ratio, reduce query response time and conserve energy of the network efficiently.
Research on Data Mining Technology in Web Based on the Cloud Computing
Authors: Zhang Feng , Liu Li
Published: June 2012

To improve the data mining efficiency, analyzed existing algorithm for data mining.However,it has some uncertain knoledge are a major concern in data mining, it is great difficulty for data mining in web knoledge,which contains more uncertainty than an affirmatory one dees. In this paper, with web mining method based on the cloud computing analysis. One is the main issues related to the web knowledge problem are detaled, the other is the commonly used methods of handling web knowledge problems in data mining are reviewed, with a diseussion about a number of their known strength and weakness. This can be used to improve the quality of information service on web and can assist the web master to optimize site architec and increase visiting efficiency. The results of experiment show that it is better than that of the existing methods proposed in the literature.
Fabrication of Electrospun Si/Carbon Composite Nanofibers as Anodes Materials for Lithium-Ion Batteries
Authors: Huang Hui Min , Chen Zhu Chi , Yu Jie
Published: June 2012

Si/carbon nanofibers (Si/CNFs) composite used as the anode materials of lithium-ion battery have been prepared via electrospinning and calcinations treatment. Hydrofluoric acid is used to remove surface oxides of Si particles. SEM observation indicates that silicon particles are uniformly embedded in the carbon nanofibers. X-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX) and Raman scattering have been used to analysis the composition and phase of the composite materials. The first reversible capacity of the Si/CNFs composite is 1004 mAh/g, and 390 mAh/g has been remained after 100 cycles. Such Si/CNFs composite could be a promising anode material in lithium ion batteries.
Image Recognition and Wireless Transmission–Based Intelligent Vehicle Access Control System
Authors: Feng Yong Qian , Li Xia
Published: June 2012

This paper proposes a new intelligent vehicle access control system scheme based on image recognition and wireless transmission to achieve the secure, intelligent, and efficient vehicle access control management. The novelty of system is the image recognition based on information of the real-time license plate. If a vehicle wants to pass the gate, its license plate image is sent to the center server by the wireless transmission module. Then the image is analyzed by the server and the characters of the license plate can be recognized. Only the vehicle with permission can pass the gate. Compared with the traditional system, the new system is possible to provide a high-efficient access control and greatly reduce security work load.
Image Matching Based on Analysis of Reliability in Log-Polar Field
Authors: Xu Yi Ping , Tan Jing , Li Hong Ping , Tian Yan
Published: June 2012

Due to the invariance to scale and rotation, image matching method based on Log-Polar transformation has been extensively applied in target detection and location. This paper analyses the effect on image matching accuracy from variation of scale and rotation, and proposes a modified image matching method based on analysis of data reliability for matching, this method can eliminate the interference from invalid data and improve the image matching performance. Experiments show that this method has better performance in accuracy.
Design of the Information Service Platform Based on Expert Knowledge Database
Authors: Dong Su Yin , Li Shuang Jiang , Wang Jing Yang
Published: June 2012

In this paper, an information service platform based on expert knowledge database was designed. The platform includes two parts: the front desk and the back management system. The front desk provides a friendly information service window for customers. The back management system includes an expert reasoning machine and a series of expert knowledge databases. Practices showed the information service platform was useful to help university librarians transforming their knowledge structure and improving the quality of information service.
A Frequency Estimation for TD-SCDMA UE
Authors: Peng Ren Ming , Mei Yang
Published: June 2012

It describes a method to implement frequency offset estimation (FOE) in cell search of the TD-SCDMA system. The received SYNC-DL data is used to calculate frequency offset (FO) before the scrambling code and the Midamble ID is identified. The received Midamble data can be used to calculate FO before Multi-frame synchronization. The FOE with two stages can be used in the same 64chip calculation structure and the hardware resources can be conserved. The simulation results show that the method can control the residual FO within 0.05PPM by smoothing of sub-frame or IIR filtering, which meets the TD-SCDMA system requirements for residual frequency, even though a certain sample bias exist.
Preparation and Characterization of Silica Aerogels/Glass Wool Composites
Authors: Liu Jing Xiao , Wang Xiao Jie , Shi Fei , Luo Jia Yu
Published: June 2012

Using industrial water glass as silica source, silica aerogel/glass wool composite heat insulation materials were prepared through the gel moulding, surface modification and ambient pressure drying method. The microstructure and porous characteristics of the silica aerogel/glass wool composites were studied by scanning electron microscopy (SEM) and BET nitrogen adsorption-desorption method. The thermal conductivity of silica aerogel/glass wool composites was measured by the thermal conductivity measurement instrument. The results indicate that the as-prepared silica aerogel/glass wool composites exhibit strong hydrophobicity and excellent thermal insulation performance. The thermal conductivity of the obtained silica aerogel/glass wool composites is 1.1×10-2～2.0 W∙m-1∙K-1, and with the increasing of aerogels content, the thermal conductivity of the composites could be decreased further.
Synthesis of Perylene-Containing Polyimides for Non-Covalent Functionalization of Graphene by Self-Assembly
Authors: He Wen Jie , He Cheng En , Peng Ren Gui , Yang Ying Kui
Published: June 2012

A perylene-containing polyimide (PPI) has been successfully synthesized by thermal polycondensation of perylene-3,4,9,10-tetracarboxylic acid dianhydride and 2,2′-(ethylenedioxy)-diethylamine at high temperature. The as-prepared graphite oxide was ultrasonically exfoliated followed by solvothermal-reduction in N-methyl-2-pyrrolidone in the presence of PPI, yielding PPI-functionalized graphene nanosheets. It was found that PPI chains were non-covalently attached to the conjugated basal plane of graphene to form self-assembly nanostructures by π–π stacking. The present work may open a new route for the fabrication of polymer composites containing graphene.
Numerical Simulation of Die Casting for Semi-Solid Aluminum Alloy and its Mould Research
Authors: Wang Cheng Zhi , Yao Guo Hai , Liu Feng Guo
Published: June 2012

Design and manufacture an aluminum alloy semi-solid die-casting. Simulate the process of rheological semi-solid aluminum alloy die-casting, and verification it by casting experiment. The result is that, the heating system of the semi-solid die-casting mold play an important role in the process of forming, and the size of gate has great impact on the quality of casting.
Steam Reforming of Acetic Acid for Hydrogen Production: Thermodynamic Calculations
Authors: Guo Long , Li Xin Bao , Wang Qi , Wang Shu Rong
Published: June 2012

In our work, acetic acid was used as a bio-oil model compound. Thermodynamic calculation of hydrogen production via steam reforming of acetic acid was attempted to investigate the effects of temperature (200-1100 °C), pressure（1-19 atm ）and steam to carbon ratio (1.5-10.5) on the concentration of equilibrium product gas and H2 yield. The results show that temperature has a profound effect on the steam reforming of acetic acid. Lower pressure and higher steam to carbon ratio are in favor of higher hydrogen production.
Effect of Tin Composition on Cu2ZnSnS4 Photovoltaic Absorbers
Authors: Fan Dong Hua , Zhang Rong , Peng Hui Ren
Published: June 2012

Cu2ZnSnS4 (CZTS) thin films are prepared by sulfurizing the precursors deposited by vacuum evaporation methods. The samples sulfurized at 500°C for 3h shows the strong (112) diffraction peak at 28.45˚, suggesting the successful synthesis of CZTS thin films. The X-ray diffraction shows that CZTS thin film prepared in Sn-poor condition have the best crystallinity. The Sn-dependent crystallite size was calculated to be 19.53-21.03 nm. In addition, we found that the optical band gap with various Sn contents can be modulated at 1.48-1.85 eV
Morphology Affects the Stability and Surface Photovoltage of Cu2O
Authors: Xu Shuang , Nuan Song , Qiu Chang Li
Published: June 2012

The effect of morphology on the stability of Cu2O remains a great challenge. We have synthesized two types of samples in cube crystal structure with about 700 nm by a facile reduction route, which were investigated by X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), Energy- dispersive X-ray (EDX) and surface photovoltage spectroscopy (SPS). It is noteworthy that one sample prepared using polyethylene glycol (PEG) as template was oxidized in air, but another template with glucose was stable in air. The testing results demonstrate that the differences of Cu2O morphology apparently affect its stability. In addition, we analyzed the effect of surface oxidation on the SPV signal of the two samples.
Hydriding and Dehydriding Kinetics of Nanocrystalline and Amorphous Mg20Ni10-xMx (M=Cu, Mn; x = 0-4) Alloys Prepared by Melt Spinning
Authors: Zhang Yang Huan , Zhao Chen , Cai Ying , Ren Hui Ping , Li Bao Wei , Zhao Dong Liang
Published: June 2012

The partial substitution of M (M=Cu, Mn) for Ni has been performed in order to ameliorate the hydriding and dehydriding kinetics of Mg2Ni-type hydrogen storage alloys. The melt spinning technology was used to prepare the Mg20Ni10-xMx (M=Cu, Mn; x=0, 1, 2, 3, 4) alloys. The structures of the as-spun alloys were characterized by XRD and TEM. The hydriding and dehydriding kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The results show that the as-spun (M=Cu) alloys hold a typical nanocrystalline structure, whereas the as-spun (M=Mn) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass formation in the Mg2Ni-type alloy. Furthermore, Mn substitution results in the formation of the secondary phases MnNi and Mg instead of changing the major phase of Mg2Ni. The substitution of M (M=Cu, Mn) for Ni exerts an insignificant effect on the hydriding kinetics, but it ameliorates the hydrogen desorption kinetics of the alloys dramatically. The hydrogen desorption ratio ( ) is enhanced form 20.84% to 52.88% for the (M=Cu) alloy spun at 20 m/s, and from 20.84% to 53.87% for the (M=Mn) alloy spun at 20 m/s by increasing the M (M=Cu, Mn) content from 0 to 4.
Preparation, Cross-Linking and Characterization of Novel Benzocyclobutene-Siloxane Polymers with Polysiloxane Mainchain and Silylbenzocyclobutene Pendant Groups
Authors: Li Hui Ling , Hang Ya Wen , Cao Ke , Zhu Fang Hua , Yang Jun Xiao
Published: June 2012

A series of BCB-siloxane polymers with benzocyclobutene (BCB) pendant groups and polysiloxane mainchain was prepared by the hydrosilylation reaction between 4-(1,1-di-methyl-1-vinyl) silylbenzocyclobutene (4-DMVSBCB) and poly (methylhydrosiloxane) (PHMS) employing Pt/C as catalyst. Upon heating the BCB-siloxane polymers, the cross-linking occurred via ring-opening of benzocyclobutene as evidenced by on-line FT-IR, 1H NMR and 13C NMR. TGA examination indicates that the thermal stability was enhanced with increasing the incorporation ratio of BCB. Most importantly, the initial decomposition temperature of crosslinked BCB-siloxane resins is as high as 429 oC, showing a superior thermal resistance over most other BCB resins.
A New Kind of Silica Microspheres Used as Filler for PDMS Composite
Authors: Gu Wen Juan , He Bang Gui , Li Yang
Published: June 2012

A new kind of silica microspheres were first synthesized with dodecyltrimethoxysilane (WD10) and tetraethoxysilane (TEOS) by sol-gel method. And hybrid membrane was prepared by incorporating the as prepared filler into polydimethylsiloxane (PDMS). Thermal degradation and mechanical properties of these composites membranes were studied by means of thermogravimetric analysis and tensile testing. The experimental results showed that both mechanical properties and thermal stabilities of these composites were significantly improved by using the as-synthesized filler.
Theoretical Investigations on Elastic and Thermodynamic Properties of CdTe
Authors: Huang Yu Hong , Jie Wan Qi , Zha Gang Qiang
Published: June 2012

The elastic and thermodynamic properties of CdTe are studied under a pressure up to 8GPa and at a temperature range of 0~900K, by density functional theory as well as quasi-harmonic Debye model. The calculated bulk modulus B and its derivative B' are consistent with the values fitted according to Debye model, which confirms the applicability of Debye model to CdTe. Heat capacity Cv , Grüneisen parameter and thermal expansion coefficient decrease with pressure, but increase with temperature. It is an opposite case for Debye temperature . The results may be instructive for CdTe to be applied in extreme conditions.
Synthesis and Luminescence Characteristics of Mg (II) Complexes with Salicylaldehyde-Henyl-Sulfonylhydrazone
Authors: Tai Xi Shi
Published: June 2012

A schiff base ligand, salicylaldehyde-henyl-sulfonylhydrazone, and its Mg (II) complex were synthesized and characterized by elemental analysis, infrared spectra, UV spectra and X-ray single crystal diffraction. The ligand formed zigzag structure by intermolecule hydrogen bonds, intramolecule hydrogen bonds and - interaction. The fluorescent property of Mg (II) complex has been investigated in solid. The result shows that the Mg (II) complex shows a luminescence emission peak at 517 nm when excited at 387 nm.
Optimize the Dielectric Slab of the Tunable Active Frequency Selective Surface Absorbing Material
Authors: Chen Qian , Jiang Jian Jun , Xu Xin Xin , Sun Biao , Zhang Li , Miao Ling , Bie Shao Wei
Published: June 2012

Active frequency selective surface (AFSS) absorber loaded with PIN diodes is a new type of structural absorber with tunable absorption properties. This absorber is similar to a sandwich, the surface is an AFSS, the middle is a dielectric slab, and the bottom is a metallic ground. In order to design and fabricate a thin and good performance absorber, the selection of dielectric slab is very important. In this paper, we detailed investigated the effects of the dielectric slab parameters (permittivity and thickness) to the absorption properties by experiments, and an experimental equation was proposed to provide a better description about their relationship. The measured results indicated there was an optimum thickness for the dielectric slab to produce the broadest bandwidth. The experimental equation was useful to optimize the design of the absorber.
Surface Plasmon Propagation in Gold Stripes and the Effect of Incident Light Polarization on Propagating
Authors: Wei Zhi Wei , Gang Song , Zhao De Wen , Yu Li
Published: June 2012

Thin metallic nanowires and stripes are highly promising candidates for plasmonic waveguides in photonic and electronic devices. We observed light from one end of a gold stripe, following excitation of plasmons at the other end of the stripe, with almost no light emitted along the direction of the stripe, and compared the propagation capacity of different size of stripes. We measured how the polarization of the incident light affected the emitted light intensity through changing the polarization of the incident light. The stripes were synthesized by lithographic fabrication technology. The results will be important for the development of photonic or electronic devices and systems.
Stickies Treatments of Recycled Fiber Pulping Wastewater by Lipases
Authors: Liu Ting Zhi , Wang De Fa , Zhao Hong Yu , Zheng Kai Yang
Published: June 2012

Two types of lipases were employed to control the stickies troubles of recycled fiber pulping wastewater in this article. The conditions of enzymatic treatments were optimized and FTIR and GC-MS were used to characterize the changes between the initial and treated wastewater. The optimized conditions of Resinase(R) were: 20u/100mL, 50°C, pH 6.5 ,2h; and those of Lipase(S) were: 15u/100mL, 50°C, pH 9.0 and 2h. Results confirmed that under these optimal conditions of each lipase, both of the two lipases show the excellent performance in the treatment of the stickies of wastewater.
Synthesis of Co3O4/RGO as Catalyst for Degradation of Orange II in Water by Advanced Oxidation Processes Based on Sulfate Radicals
Authors: Shi Peng Hui , Zhu Shao Bo , Su Rui Jing , Ren Jin Tao , Li Deng Xin , Xu Shi Hong
Published: June 2012

One step synthesis reduced graphene oxide and cobalt oxides nanocomposites (Co3O4/RGO) in ethylene glycol as heterogeneous catalyst. The Co3O4/RGO was conﬁrmed by X-ray diffraction (XRD). And Co3O4/RGO exhibits an unexpected, surprisingly high catalytic activity in degradation of Orange II in water by advanced oxidation processes based on sulfate radicals and 100% decomposition could be achieved in 16 min.
Effects of EDTA, EDDS and Citric Acid on Growth of Maize and Uptake of Lead by Maize in Contaminated Soil
Authors: Cheng Guo Ling , Ma Xiao Feng , Sun Xing Bin , Zhao Shu Qing
Published: June 2012

EDTA, EDDS and citric acid were added to moderate artiﬁcial contaminated soil to investigate the effects of the organic acids on growth of maize seedlings and phytoextraction of lead by maize. The results show that the effects of the organic acids on plant growth are different in Pb contaminated soil. The organic acids can change the dry matter distribution of the shoots and the roots and can increase the shoots biomass in most case. EDTA and EDDS can signiﬁcantly increase the concentrations and uptake of Pb in the shoots of maize, indicate that EDDS is a potential phytoextraction intensifier in phytoremediation of Pb-contaminated soil.
Research on Optimal Formula of Dustfall Agent to Remove Blasting Smoke
Authors: Niu Wei , Jiang Zhong An , Chen Ju Shi
Published: June 2012

In order to reduce dust produced during the blasting, effective measures according to smoke components and properties are required to be taken. The experiment adopted a number of base materials and surface-active agents to reduce the dust in smoke. Besides, corresponding additives were adopted to reduce poisonous and harmful gases during the blasting. Experiments focused on wettability and surface tension, using contrast experiment to determine optimal base material and surface-active agent, and also studied the influence of additives on their performance. The experimental results suggested that： sodium chloride was the optimal base material, sodium dodecyl benzene sulfonate was the optimal surface-active agent, and copper sulphate and ammonium chloride as additives had almost no influence on performance of surface-active agent and base material. Therefore, adding this dustfall agent to the water bag during the blasting can effectively reduce the concentration of smoke.
Spectroscopic Investigation on OH (A-X) Emission in a Corona Radical Shower System for Purifying Flue Gas from Energy Material Burning
Authors: Lu Hao
Published: June 2012

There are lots of gaseous pollutants in the flue gas from energy material burning, which could be oxidized by OH radical. The experimental investigation on OH (A2+ X2 ) emission in a corona radical shower system was reported in this work. OH distribution and production in the system were investigated under different additional gases. Depending on the selection of Ar or O2 as the additional gas, OH (A) radical generation was observed to be significantly enhanced or suppressed, respectively, in terms of emission intensity, and H2O content in the additional gas could effect OH generation obviously.
Environmental Pollution Analysis and Countermeasures of Chang-Ji Regional Integration with Analysis of Emission Materials from Waste Water and Pollutants
Authors: Wang Dong Fu , Zhao Wen Yan , Duan Hai Yan , Wang Xian En
Published: June 2012

The best choice for the openness and integration between Changchun city and Jilin City is to carry out the Integrate. This paper analyzes the environment quality conditions of Chang-Ji region and the selection of pollutant control materials, and points out the pressure and challenges of environmental protection, and puts forward the Suggestions that can solve the problem.
Effects of N:P Ratio and Nutrient Level on the Competition between Invasive Alternanthera philoxeroides and Native Oenanthe javanica
Authors: Chang Rui Ying , Wang Ren Qing , Zhang Yi Ran , Liu Jian
Published: June 2012

This study examined the effects of N:P ratio and nutrient level on the competition between invasive Alternanthera philoxeroides and native Oenanthe javanica in terms of morphological and physiological traits and the relative dominance index (RDI). In the experiment, A. philoxeroides was grown in mixture with O. javanica at three N:P supply ratios (1,10,100) combined with three levels of nutrient supply. The results suggested that the morphological and physiological traits of invasive and native species were both significantly affected by N:P ratio and nutrient supply level. The total biomass of both species was maximal under the treatment of lowest N:P ratio and highest nutrient supply, and A. philoxeroides had higher total biomass than O. javanica in every treatment. A. philoxeroides had higher plasticity than O. javanica on total biomass, R/S, SLA, which had sensitive response to the changing nutrient conditions. Meanwhile, the RDI of A. philoxeroides under high nutrient supply was higher than that under low nutrient supply, which showed that high nutrient supply could promote the invasion of A. philoxeroides while P-limitation (high N:P ratio) may prevent the successful invasion of A. philoxeroides under the lower nutrient supply.
The Appropriate Chemical Admixture for Alkali-Activated Cementitious Material
Authors: Li Zhong Xin , Tang Jun Wu
Published: June 2012

Compared with Portland cementitious material,alkali-activated cementitious material owns many excellent performance,such as high strength, good durability, low heat and so on;however,the absence of admixture for alkali-activated cementitious material makes contribute to embarrass application of this type of material. The paper introduces some approiate chemical admixture for alkali-activated cementitious material, summarizes and dicusses the mechanism of few admixture,also raises the current problem and prospect for alkali-activated cementitious material
Optical Interaction in a Plasmonic Metallic Nanoparticle Chain Coupled to a Metallic Film
Authors: Zhao De Wen , Gang Song , Wei Zhi Wei , Yu Li
Published: June 2012

We demonstrated the coupling of localized surface plasmons and surface plasmon polaritons modes in a system composed of a metallic particle chain separated from a thin metallic film. The results showed that: (1) the thickness of the metallic particles buried in the dielectric space, (2) the positions of the particles influence the level of interaction between localized surface plasmons and surface plasmon polaritons modes. Meanwhile, the positions of the particles and the thickness of the metallic particles control the electromagnetic enhancement and influence the electric field distributions in this system. This kind of system has a very promising candidate for biosensing and surface enhanced spectroscopy applications.
Electrochemical Synthesis of Polyaniline and its Anticorrosion Performance for X70 Steel
Authors: Fan Wen Jun , Mu Jia Li , Shan Shao Yun , Jiang Li Hong , Wang Ya Ming , Jia Qing Ming
Published: June 2012

The effects of preparation conditions on the synthesis of polyaniline and its anticorrosion performance were investigated using single-factor method. The experimental results showed that the better conditions for electrochemical synthesis of polyaniline films are 0.5 M aniline, 0.8 M H2SO4, range of sweep voltage 1.6 V~-0.3V (Init =-0.3V), sensitivity 1.e-002, sweep segment 8, scan rate 0.1V/s. The anticorrosion performances of polyaniline films were investigated in 5% and 2.5% MgCl2 solutions respectively. Polarization and AC impedance technique tests proved that the polyaniline film owned a better anticorrosion performance to X70 in 2.5% MgCl2 solution than the denser one. And, it was found that polyaniline films adhered to X70 steel exhibited good barrier properties for a prolonged corrosion process. The above results provided some experimental data and theoretical guidance of polyaniline anticorrosion properties for some metals, especially for metals using in oil and natural gas industry.
Process on Inorganic Nanomaterial Synthesis by Microwave-Hydrothermal Methods
Authors: Li San Mei , Shan Shao Yun , Jia Qing Ming , Hu Yi Cheng , Jiang Li Hong , Wang Ya Ming
Published: June 2012

The microwave-hydrothermal method is one of the methods preparing inorganic material. In this paper, the synthesis principle and application of microwave–hydrothermal technology in preparing nano-material were summarized. The application prospect of synthesizing inorganic material by microwave- hydrothermal method was prospected. The microwave- hydrothermal technology plays an important role in accelerating and optimizing the crystallization and nuclear of inorganic nano-material, which will provide a new way for inorganic material synthesis.
Site Preference and Elastic Properties of 3d Transition Metals Alloying Addition in Ductility YAg Alloys
Authors: Wu Yu Rong , Hu Wang Yu , Xu Long Shan
Published: June 2012

First-principles supercell calculations based on density functional theory were performed to study the site preference behavior and elastic properties of 3d (Ti-Cu) transition-metal elements in B2 ductility YAg alloy. It is found that Ti occupies the Y sublattice, while V, Cr, Co, Fe, Ni and Cu tend to substitute for Ag site. All alloying elements can decrease the lattice parameters of Y8Ag8, among which Y7Ag8Ti shows the largest change. Furthermore, the calculated elastic constants show that Cr, Fe, Co and Cu can improve the ductility of YAg alloy, and Y8Ag7Fe presents the most ductility among these alloy, while Ti and Ni alloying elements reduce the ductility of YAg alloy, especially, V transforms ductile into brittle for YAg alloy. In addition, both V and Ni can increase the hardness of YAg alloy, and Y8Ag7V is harder than Y8Ag7Ni.
The Influence of Ni on the Microstructure of Co-Base ODS Alloys
Authors: Zhang Lin , He Xin Bo , Qin Ming Li , Liu Ye , Qu Xuan Hui
Published: June 2012

Co-based ODS alloys strengthened by γ΄ precipitates and nanosized oxides are promising high-temperature structural materials. Single solid solution of Al and W in the matrix can not be achieved after mechanical alloying, resulting in the formation of low volume fraction of γ΄ phase and several kinds of secondary phases. The addition of Ni promotes the precipitation of γ΄ phase and reduces the amount of secondary phases by the enlargement of the solid solution limit of Al and W within the matrix. In comparison with the lower fracture strength and cleavage fracture mode of the alloy without the addition of Ni, Ni-containing Co-base ODS alloys exhibit much higher fracture strength and obvious ductile facture mode.
Atomistic Simulation for the Site Preference of Tb3(Fe28-XCoX)V1.0 Compounds
Authors: Sun Jing , Huang Shuo , Shen Jiang , Qian Ping
Published: June 2012

The effect of cobalt on the structural properties of intermetallic Tb3(Fe28-xCox)V1.0 with Nd3(Fe,Ti)29 structure has been studied by using interatomic pair potentials obtained through the lattice inversion method. Calculated results show that the order of site preference of cobalt is 8j(Fe8), 4e(Fe11) and 2c(Fe1) which is in good agreement with experimental results. And the calculated lattice constants coincide quite well with experimental values. All these prove the effectiveness of interatomic pair potentials obtained through the lattice inversion method in the description of rare-earth materials.
A Study on Influence of Annealing and Aging on High Temperature Internal Friction in Al-Zr Alloy
Authors: Cao Xiao Hui , Wang Yu
Published: June 2012

By using a low frequency inverted torsion pendulum, the high temperature internal friction spectra of Al-0.02wt%Zr and Al-0.1wt%Zr alloys were investigated respectively. In Al-0.02wt%Zr alloy, the conventional grain boundary internal friction peak (Pg) is observed with some small unstable peaks. In Al-0.1wt%Zr alloy, the bamboo peak is observed to appear at the high temperature side of the conventional grain boundary internal friction peak. The conventional grain boundary internal friction peak decreased and moved to higher temperature. The bamboo peak owns an activation energy of 1.75eV. When average grain size exceeded the diameter of samples, Pb strength was reduced and its position was shifted to a lower temperature. Based on the grain boundary sliding model, Pg and Pb peaks were explained. Their dependence on annealing temperature and time was determined by considering the effects of contained Ce atoms and other impurities on the relaxation across grain boundary.
Study of Crystal Structural about La2/3(Ca(1-X)ZnX)1/3MnO3
Authors: Xin Yong , Chen Guo Yun , Luo Cheng Hong , Deng Xin Fa , Hu Ling Yan
Published: June 2012

Some samples of La2/3(Ca(1-x)Znx)1/3MnO3 （x = 0, 0.2, 0.4, 0.6, 0.8, 1.0） were prepared by solid-state reaction method at 1623K. The crystal structures of the compounds were studied by X-Ray Diffraction(XRD). All the samples are orthorhombic structure (Pnma), the symmetry has no obvious change with the increase of Zn atom content x. The crystal lattice constants, Mn-O bond length and Mn-O-Mn bond angle varied with the different Zn content, analyzed by the Rietveld method.
Synthesis and Structure Determination of Carbonized Nano Mesoporous Materials Based on Vegetable Raw Materials
Authors: Azat Seitkhan , Pavlenko Valodia V. , Kerimkulova Almagul R. , Mansurov Zulkhair A.
Published: June 2012

This article presents the results of the synthesis of carbon nanomaterials: Nanoscale materials obtained by carbonization of waste agricultural products (apricot kernel, walnut, rice husk). The results of physico-chemical characteristics of the obtained nanomaterials.
Preparation of High Water Absorption and Retention Material by Graft Copolymerization of Calcium Lignin Sulphonate with Acrylic Acid and Acrylamide
Authors: Yang Xiao Feng , Yu Xing Guo , Xue Qun Hu , Zhang Zai Yong
Published: June 2012

High water absorption material was prepared by graft copolymerization of calcium lignin sulphonate with acrylic acid and acrylamide. Effect of process parameters on graft copolymerization and sample properties was investigated by means of the single-factor method, and the microstructure of fracture surface of the water absorbent resin was analyzed by SEM. The result shows that: when mass percents of acrylic, acrylamide, calcium lignin sulphonate, initiator and crosslinking agent are 65.5%, 19.5%, 15%, 0.09%, and 0.05%, respectively, and neutralization degree is 60% with 2h of initiation reaction time and 1.5h of crosslinking reaction time. The water absorption rate of material is up to 1010g/g, and 0.9wt% NaCl solution absorption rate is up to 110g/g.
Research on Viscoelasticity and its Influence Factors of Polymer Solution
Authors: Zhou Yun Jian , Lv Jiang Yan , Wu Di
Published: June 2012

The Wiesenberger number is a common dimensionless quantity to reflect the elastic effect of fluids. It’s usually applied in mechanical calculation of viscoelastic fluid and calculated by the first normal stress difference. So the first normal stress difference and Wiesenberger number are applied to describe the viscoelasticity of polymer solutions. Though many literature reviews on the viscoelasticity of polymer solutions have been reported, only a few studied the Wiesenberger number and the first normal stress difference of viscoelastic fluid. Since the corresponding relation between Wiesenberger number and mass concentration and salinity of polymer solution is not clear, HAAKE RS150 rheometer was used during all steady and dynamic shear experiments, effects of mass concentration and salinity on the visco-elasticity of polymer solution in low shear rate were discussed, first normal-stress difference and Wiesenberger number were calculated. Results show that: with the increase of mass concentration of polymer solution and the decrease of salinity, both first normal-stress difference and Wiesenberger number increase, the visco-elasticity of polymer solution increases; At the same shear rate, the higher the salinity is, the smaller the first normal stress difference is, the smaller the Wiesenberger number is and the less obvious the viscoelasticity is. The Wiesenberger number of ordinary polymer solution used in the oilfield is about 1 when the shear rate is 10s-1and salinity is 508mg/L.
Structure of Patinopecten Yessoensis Shell is a Biomimetic Example of Composite
Authors: Lin Ai Guang , Ding Xiao Fei , Xie Zhong Dong , Ma Xian Ying , Mu Cen Xiao
Published: June 2012

Shell is a natural composite material with excellent mechanical property. it is a model of biomimetic composites. In the paper, the morphology of the scallop (patinopecten yessoensis) shell was observed by SEM. The results are shown that the shell is composed by the tertiary structure. The primary one is the layered structure, the secondary one is prism-shaped fibre cluster similar to rectangle and end of arrow shaped, tertiary structure is lathy fibre, angle-shaped fibre, prism shaped fibre and scales. The tough structure of shell has reference value for bionic, this is also the purpose of the microscopic structure model of scallop shell in the paper.
How to Strengthen the Sense of Solid Wood of Frame-Board Type Furniture
Authors: Tang Li Hua , Liu Wen Jin
Published: June 2012

The frame-board type furniture was born due to people’s preference of solid wood. This paper analyzed the composed mode of parts of the frame-board type furniture (FBF) and the sense of solid wood (SSW). By visual frame structure form, the plate structure in reality and pretty detailed design can strengthen the SSW of FBF. Some manufacturing and surface decoration techniques were introduced in this paper.
Using RAFT Polymerization to Synthesize Potential Drug/Gene Delivery System
Authors: Zhao Yue , Tan Xin , Zhang Ling
Published: June 2012

Biodegradable cationic micelles were prepared from P(PEGMEMA)-PDMAEMA-PCL-PDMAEMA-P(PEGMEMA) five blocks copolymers by reversible addition-fragmentation chain transfer (RAFT) polymerization with CPADB-PCL-CPADB (CPADB: 4-Cyanopentanoic acid dithiobenzoate; PCL: 5600 Da) as a macro-RAFT agent. These five blocks copolymers formed nano-sized micelles in water.
Rheological Property and Miscibility of Lignin-Based LDPE/EVA Blends with Compatibilizer
Authors: Zhou Jian , Luo Xue Gang
Published: June 2012

Being interested in the development of lignin-containing polymeric materials had been investigated in this paper and the lignin/LDPE-EVA blends compatibilized with LDPE-g-MAH prepared in rheometer were characterized by rheological properties. The experimental results indicated that the maximum, balanced torque and plasticized time were lowest to 53.7N.m-1 and 11.7N.m-1 75s, respectively, with compatibilizer additon of 10 parts. In addtion, mechanical properties, FT-IR, SEM and DSC-TG were measured and the results revealed that the compatibility and miscibility of lignin/LDPE-EVA blends were improved obviously.
Effects of Particle Volume Fraction on Dynamic Deformation Behaviors of B4C Reinforced Aluminum Matrix Composites
Authors: Li Xian Feng , Liu Bin , Huang Wen Mao , Wang Hao Wei
Published: June 2012

Particles size grading method was employed to fabricate aluminum matrix composites reinforced with 75% volume fraction B4C particles by squeeze casting. Dynamic behaviors of the composite was investigated and compared with 55 vol. % composite which were reinforced with particles of uniform size. The results showed that the flow stress increased but the fracture strain decreased with increasing reinforcement volume fraction. Furthermore, the dynamic behaviors of 55 vol. % composite were significantly affected by adiabatic heating softening which was demonstrated by the local melted matrix on the fracture surface and an increase-decrease tendency on flow stress and failure strain was obtained with increasing impact velocity. However, due to load redistribution caused by particles size grading, no melted region was found on the fracture surface and no increase-decrease tendency on flow stress and failure strain was observed for 75 vol. % composites under the same impact loading.
Dissolution of Cellulose in [Amim]Cl/Lithium Salts Solvents System
Authors: Liao Wei Xiao , Song Jun , Cheng Bo Wen , Mei Jie
Published: June 2012

Lithium salts were dissolved in ionic liquid [Amim]Cl, and their dissolution behavior were tested by turbidimeter. It is found that the solubility of LiCl in [Amim]Cl is up to 14g/100g [Amim]Cl at 70°C, and it keeps growing as the temperature increase. Turbidity of cellulose solution in [Amim]Cl at 70°C was obtained, but the solubility of high concentration cellulose solution could not be demonstrated accurately in this way. Cellulose solutions with [Amim]Cl or [Amim]Cl/lithium salts as solvents at different temperature were obtained, in which the lithium salts were 1wt%(mass fraction of [Amim]Cl), polarization microscope was used to observe the dissolution behavior of cellulose. The solubility of cellulose would increased as temperature rose, and the solubility of cellulose in [Amim]Cl/1wt%LiCl reached 11.9%(mass fraction of [Amim]Cl) at 80°C, which was higher than in [Amim]Cl 9.4% at 80°C. It is found that the addition of lithium salts into [Amim]Cl can really improve the solubility of cellulose than in [Amim]Cl.
Research Progress on Tissue Engineering of Neural Stem Cells
Authors: Chen Xiao Yu , Zhuang Shu Juan , Hou Xiao Ming , Liu Qing Shan
Published: June 2012

Neural stem cells (NSCs), as therapeutic agents, play the key role in the treatment of central nervous system (CNS) disorders. It is a researching tendency for promote proliferation and differentiation of neural stem cells by using tissue engineering. It is discovered that joint use neural stem cells and NSCs-seeded scaffold may increase the cell survival state and better control cellular microenvironment. We find suitable material include natural biological materials, synthetic materials, compound materials, bio-derived materials and 3D-materials of neural stem cells tissue engineering by analyzing and summing up of the research which combine tissue engineering with NSCs transplant in past several years. It hold out a hope of the possibility of utilizing the treatment of neural stem cells transplantation with tissue engineering, and there has been a great quantity of achievements on the research of it to treat CNS disorders by promote proliferation and differentiate.
Effects of Calcination upon Properties of Needle-Cokes
Authors: Shao Zhong Cai , Liu Xin Qing , Yang Bo
Published: June 2012

The effects of calcination on preparation of needle coke were studitied.The relationship between structureand and property of needle coke that was prepared under calcination were characterized by SEM,XRD and FT-IR analysis.The results indicated that the effect of calcination on the preparation of needle coke was positive．The higher temperature of caclineing and the longer time of caclineing，the better the ordered degree of needle coke and its fibrous texture. The incomeing of N2 can increase the ordered degree. FeCl3 which was a sublimate material was prejudiced to the graphitization of the needle coke. Through the observation of microstructure,we could find that there were some sample particles existing surface,thinking the particles were Fe ions,which was unhelpful for the preparation of needle coke.
Study on the Variety Identification Method of Bast Fibers
Authors: Zhang Hua , Zhang Jie , Zhang Xiao Xia
Published: June 2012

In view of the discrimination difficulty of bast fiber in the market, the optical microscope and SEM were used to distinguish the breed of bast fiber. The results showed that bast fiber can be distinguished from diverse fibers by optical microscope, and then the specific breed of bast fiber can be distinguished by SEM.
Mechanical and Thermodynamic Properties of Chlorophyll-a Surfactants at Air-Water Interface
Authors: Periasamy Vengadesh
Published: June 2012

Self-assembly of surfactants at air-water interfaces are widely used in the process of forming thin films for various applications. However, methods of determining fundamental properties of molecular scale interactions of these floating monolayers involve complicated processes. In this study, Langmuir-Blodgett method was used to generate surface pressure-area isotherms, which were manipulated to determine various mechanical and thermodynamic properties of Chlorophyll-a surfactants crucial in understanding molecular level interactions crucial in bottom-up design architectures. Results demonstrated optimum Chlorophyll-a concentration at 2.0 mg/ml of giving proper molecular area at zero surface pressure at 86.7 Å2/molecule. Using the elastic modulus profile, deposition pressure for close-packed phase is calculated as 26 mN/m. Young’s modulus meanwhile was measured as 0.04 GPa corresponding to about 6000 psi of pressure, which is between the values exhibited by rubber (0.01 to 0.1 GPa). Close-packed Chl-a monolayer was observed to have properties similar to rubber, with its Poisson’s ratio calculated at about 0.55. The results measured illustrates that the method could be employed to scrutinize deposition conditions and film characteristics for Chl-a molecules and other amphiphilic materials in the fabrication of bio-devices.
Study and Application on Layered Polymer Injection with Concentric String
Authors: He Ya Wei , Liu Li Cai
Published: June 2012

At present, the domestic pipe string on layered polymer injection is mainly focused on the layered polymer injection technology with the hollow single pipe string, but it's limited by facts such as complicated operating and retrieving, subjecting to plugging, and single injection fluid system for each and every zones in a well. This paper starts with the idea of concentric string, directing at the construction about the profile controlling on the injection well which has 2-section or 3-section, the layered injection technique of 2-section with tubing-casing and 3-section with concentric string is investigated separately. Based on the actual formation section properties, relatively independent injecting channels are established from wellbore, and its technical proposal and corresponding tools are preceded. Now the technique has been successfully performed on 15 wells, meeting the requirements of the layered profile controlling by injecting different fluid system and displacement as well as different concentration to different layers.
Effect of Hyperbranched Polymer on Crystallization Kinetics of Isotactic Polypropylene
Authors: Liu Guang Tian , Lei Jing
Published: June 2012

In this paper, the isothermal crystallization kinetics of isotactic polypropylene (iPP) and iPP with 5% hyperbranched polymer (HBP) added had been investigated by differential scanning calorimetry (DSC). The results show that a small addition of HBP affects the crystallization behavior of iPP. During isothermal crystallization, the crystallization rate of the blend is higher than those of iPP remarkably. An increase in the Avrami exponent may be attributed to the fractal structure of hyperbranched polymer. The crystallization activation energy is estimated by the Friedman equation, the results show that the activation energy decreases remarkably by addition of HBP and the crystallization rate of the blend is more sensitive to temperature than that of iPP.
The Reaserch of Displacement Oil of the Polymer System with the Low Interfacial Tension Conditions
Authors: Ma Wen Guo , Guo Quan , Li Dan , Liu Ren Qiang , Xia Hui Fen
Published: June 2012

The polymer system in low interfacial tension conditions is a important technology in oilfield production. Through the Using both rheometer(HAAKE RS150) and interface tension instrument(TS500), the effect of interfacial tension character and viscosity caused by the changing of polymer mass concentration is studied in 30 degrees celsius condition. The man-made core displacement oil experiments and visual model displacement oil experiments were carried out, the displacement efficiency of polymer solution with low interfacial tension after water flooding or polymer flooding was analyzed. The results indicate that the interfacial tension between polymer system with low interfacial tension and oil first reduced, then increased with the increasing of polymer mass concentration, when the polymer mass concentration changes form 0.5gram/Litre to 1.5gram/Litre, the interfacial tension is 10-3 milli-Newton/meter order of magnitude, when the polymer mass concentration increased to 2.0gram/Litre, the interfacial tension is 10-2 milli-Newton/meter order of magnitude. With the changing the polymer mass concentration of polymer system from 0.5gram/Litre, 1.0gram/Litre and 2.0gram/Litre, the viscosity of polymer system with low interfacial tension increased obviously. The recovery ratio can be enhanced further by polymer solution with low interfacial tension after both water flooding and polymer flooding.