bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Pumping Unit Based on Simulink
Authors: Zhang Zi Kuan , He Lin , Yang Li
Published: July 2013

To study pumping unit of operating state in practical work, permanent magnet synchronous motor of direct torque control was used to model and simulate based on Matlab/Simulink software, and analyzed the waveforms change under normal operation and intermissive pumping. The results indicate that permanent magnet synchronous motor can operate smoothly under low speed and high torque condition, and can transit smoothly with different torque and acceleration. The proposed simulation system can achieve stable control, and its effectiveness is confirmed experimentally. Results of simulation analysis have some certain practical value for pumping unit driven by permanent magnet synchronous motor of direct torque control.
Study of Signal Distortions on Behavior of Internal Traders
Authors: Chang Tong , Gong Li Ming
Published: July 2013

In this paper was based on Kyle (1985) model, considering the conduction problem of the value of internal information, and established a single term insider trading by trading model to consider the case of signal distortions for the true value of the risky assets. And studied the effect of internal information has on the nature of internal trading strategies and market under a more general assumption condition. And compare the conclusion with Kyle (1985) model.
Study on the Property Dynamic Filtration Performance of Anthranilic Acid Copper in Environment Engineering
Authors: Wang Xiao Jing , Wang Fan , Jin Ji
Published: July 2013

Based on the filtration experiment of a rotary filter press equipped with the filtration fabric, this paper presents a study on the dynamic filtration performance and the filtration resistance of anthranilic acid copper during the production of saccharin sodium. The best possible operating condition is expected by examining the influence on the filtration rate and its attenuation in different operating conditions, which can provide guidance for future industrial applications, and an efficient regeneration method is proposed.
Mechanical Assembly Design Strategy for Rapid Development of Technology
Authors: Gao Dong Dong
Published: July 2013

The mechanical assembly is to achieve mechanical parts or components connected in accordance with the technical requirements of the design, and combine the mechanical parts or components into the machine. The mechanical assembly is an important part of the machinery manufacturing and repair, especially for mechanical repairs, due to the offering of Machinery Manufacturing assembly parts has advantage for Machinery make, this makes the assembly work of an exceptional nature. The quality of assembly work plays a very important role on the machine performance, the duration of the repair work of labor and cost.
Design and Analysis of the Building Environment Based on DeST Software
Authors: Shu Jiang , Wen Yu
Published: July 2013

With the Songhua university Dust software simulation technology as a tool, and the green environment and sustainable development concept as a guide, to construct the building process heat balance model, and to put forward the state space equation method of the heat balance Selecting World Expo 2012 Yeas Korea swimming pool is a real column object, to discuss the key elements of dynamic thermal engineering design, a modern architectural design is no longer isolated, and however it is a combination of science and art, sublimation of humanity and intelligence, which is a comprehensive system design.
Evaluation of Various Laminated Plate Theories Accounting for Interlaminar Transverse Shear Stress Continuity
Authors: Wang Xiao Dan , Shi Guang Yu
Published: July 2013

Based on a unified form of the plate kinematics in terms of the transverse shear functions and the Heaviside step function, the analytical solutions of laminated plates corresponding to a number of higher-order shear deformation plate theories are solved in this paper. The accuracy assessment of these higher-order laminated plate theories is conducted by comparing the resulting analytical solutions with the elasticity solutions and finite element results. The accuracy study shows that the interlaminar shear stress continuity condition is very important for the accurate prediction of the transverse shear stresses across the laminated plate thickness. The comparison study also indicates that the new laminated plate theory accounting for the interlaminar transverse shear stress continuity proposed by the authors yields both very accurate displacements and accurate stresses. This new higher-order laminated plate theory can be efficiently used in the finite element analysis of laminated composite plates since it uses the same five field variables as those used in the first-order shear deformation plate theory.
Microstructural Characteristics of Multiphase Low Carbon Steel Welds with Different Ti and B Element Contents
Authors: Hwang Si Woo , Ha Min Chul , Kang Yong Joon , Lee Chang Hee , Park Kyung Tae
Published: July 2013

In this work, a high strength, high toughness low carbon steel weld was developed by controlling the contents of B and Ti which are the minor but critical elements to the weld microstructure. The weld with the low B - Ti content exhibited the high strength close to 1 GPa and the excellent toughness over 70 J at 40 °C. The weld microstructure consisted of the multiphase which composed acicular ferrite, bainite, martensite, under welding condition. A weld with the high B - Ti content was fully martensite and exhibited the high strength over 1 GPa but the poor toughness below 15 J at 40 °C. The present results inform that, when the low carbon steel weld contains the substantial amount of various alloying elements to obtain the high strength, the B content should be low as possible so that a substantial amount of acicular ferrite is ensured by screening the hardenability improving effects from other elements. The Ti content was found to affect the size of the multi-component oxides such that the less the Ti content, the smaller the oxide size which is critical to the acicular ferrite nucleation.
Preparation of Interface-Cross-Linked Micelles as Drug Delivery via RAFT Polymerization
Authors: Li Jian Ping , Cui Lian Lai , Tan Xin , Zhang Ling
Published: July 2013

Block copolymer PLA200-b-PPEGMEMA225 were prepared via ring-open polymerization and RAFT process. Further stabilization of the micellar system was performed in water using a dimethacrylate (EDGMA), and the RAFT to cross-link the interface. The interface-cross-linked micelle was found to present better properties than the uncross-linked block copolymer micelle during the drug loading and releasing experiment. Both block copolymers and cross-linked micelles show no toxicity on COS-7 cell line.
Experimental Correlation for the Effect of Metallurgical Parameters on the Hardness of 356 and 319 Aluminum Alloys Using Minitab Software
Authors: Tash Mahmoud M. , Alkahtani S.
Published: July 2013

The present study was undertaken to investigate the effect of metallurgical parameters on the hardness and microstructural characterisations of as-cast and heat-treated 356 and 319 alloys, with the aim of adjusting these parameters to produce castings of suitable hardness and Fe-intermetallic volume fractions for subsequent use in studies relating to the machinability of these alloys. Hardness measurements were carried out on specimens prepared from 356 and 319 alloys in the as-cast and heat-treated conditions, using different combinations of grain refining, Sr-modification, and alloying additions. Aging treatments were carried out at 155 °C, 180 °C, 200 °C, and 220 °C for 4 h, followed by air cooling, as well as at 180 °C and 220 °C for 2, 4, 6, and 8 h. Peak hardness was observed in 356 alloys when aging was carried out at 180oC/4h. In the case of unmodified or modified 356 alloys containing mostly α-Fe intermetallics, aging at 180 °C up to 8h produced a sharp rise in hardness during the first two hours of aging, followed by a broad peak or plateau over the 2-8 h aging period. Aging at 220 °C revealed a hardness peak at 2h aging time for both 356 and 319 alloys. Addition of Mg to unmodified or modified 319 alloys produced a remarkable increase in hardness at all aging temperatures. This may be explained on the basis of the combined effect of Cu-and Mg-intermetallics in the 319 alloys, where hardening during aging occurs by the cooperative precipitation of Al2Cu and Mg2Si phase particles.[, ] For 356 and 384 alloys, the Mg-containing 319 alloys (~same Mg concentration as in 356 alloys) displayed higher hardness values than the 356 alloys for the aged condition, where hardening occurs by cooperative precipitation of Al2Cu and Mg2Si phase particles in 319 alloys compared to only Mg2Si precipitation in the case of 356 alloys.
Evaluation of the Corrosion Behavior and Hardness of Glucose-Carburized Steel in Comparison with Fe2B Borided Layers
Authors: Pechlivani E.M. , Stergioudis G. , Pavlidou Eleni , Tsipas D. , Skolianos S.
Published: July 2013

The paper aims to compare the hardness and corrosion behavior of carburized and borided Iron-Based Austenitic Steels (IBAS) which were treated at the same temperature and time under vacuum conditions. Boronizing was performed by pack cementation in Ekabor II powder and carburization was carried out by annealing under vacuum conditions using glucose as a carburizing medium. Both boronizing and carburizing procedures were performed at 900°C for 3h. The characterization of the treated materials was assessed by using X-Ray Diffraction (XRD) analysis, optical observations, Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS) measurements and micro-Vickers hardness tests. Potentiodynamic polarization curves were also used to determine electrochemical characteristics such as the corrosion potential (mV), corrosion current density (μΑ/cm2) and corrosion rate (μm/year). The results showed that borided samples with a single phase layer, exclusively Fe2B strongly toothed, exhibited better hardness behavior towards carburized samples but lesser corrosion resistance instead.
Evaluation of Properties of Selected Coatings on Steel C60E in Terms of their Use in Gearing
Authors: Bošanský Miroslav , Vanya Attila , Veres Miroslav
Published: July 2013

The work deals with attribute ratings of chosen hard thin coatings on substratum C60E. The work contains their tribological properties and based on critics review, hard thin coating applicable to material used for the manufacture of gear wheels of type C60E is designed aiming to increase surface carrying capacity of gear wheels made from C60E material.
Experimental Investigation on the Surface Integrity of Titanium Alloy TC4 in Abrasive Belt Grinding
Authors: Wei He Ping , Huang Yun , Liu Zhao Yang
Published: July 2013

This paper aimed at that titanium alloy grinding is easy to appear surface burn, crack, then carry out the titanium alloy TC4 abrasive belt grinding experiment, focus on the effect of grinding parameters on the titanium alloy TC4 surface integrity (surface roughness, microstructure and surface residual stress) . The results of the study show that the use of zircon corundum belt and cutting speed velocity range from 18 to 26 meter per second, the surface integrity of titanium alloy TC4 is better.
Preparation and Characterization of Silane Modified Fe3O4 Nanoparticles by Reverse Micro-Emulsion
Authors: Yao Ying , Shen Ying Ying , Du Xue Yan
Published: July 2013

Hydrophilic Fe3O4nanoparticles (NPs) were prepared by reverse micro-emulsion, in which OP-10 as surfactant, n-butanol as co-surfactant, cyclohexane as oil phase, FeSO4·7H2O and FeCl3·6H2O aqueous solution as water phase. The as-prepared Fe3O4NPs were functionalized by using of silane coupling agent 3-glycidoxypropyltrimethoxysilane (KH-570) to promote adhesion at the inorganic and organic interface (s). From the experimental results, it was found that the modified Fe3O4NPs were of inverse spinel crystalline structure, and both Fe3O4and modified Fe3O4NPs exhibited super-paramagnetic behavior due to it near zero coercivity value.
The Experimental Study of 15CrMo Steel Fatigue Performance
Authors: Gu Meng Yuan , Li Xiao Yang , Yu Hui Ping
Published: July 2013

15CrMo steel is widely used in engineering. In order to evaluate the fatigue performance of 15CrMo, axial loading for 15CrMo specimen has applied by high frequency fatigue testing machine under stress ratio R=0.1 at room temperature, the linear S-N relationship has obtained by grouping fatigue test, the fatigue limit has obtained and compared by two different fatigue limit analysis method. The consequences of this test could provide a theoretical support for the use of 15CrMo in engineering and the research of fatigue limit theory.
Comprehensive Identification of Durability for Selected Cutting Tool Applied on the Base of Taylor Dependence
Authors: Panda Anton , Duplák Ján , Vasilko Karol
Published: July 2013

Technical practice uses a lot of cutting tools made of different materials. According to selecting workpiece have to be defined technological conditions. For all selected technological conditions is important prescribe parameters for machining. The basic parameters for every cutting process are cutting speed, feed and cutting depth. These technological conditions are defined by means of calculation or by means of mechanical engineering tables. Specification of tool wear by means of calculation is very difficult. Very important cutting tool property is its durability. Durability of cutting tool defines lifetime of this cutting tool and it determines its suitability for select technological operation. Technical science defines a lot of different factors, that they may be cause of shorter cutting tool lifetime. For increase cutting tool durability is necessary maximally possible elimination of these factors. Determination of cutting tool durability is very important, because provides comprehensive information how to determine appropriate technological conditions for selected cutting tool. In engineering is for determination of cutting tools durability used T-vc dependence. The article describes process how to create the durability dependence for cutting tool made of cutting ceramic (Al2O3) by means of T-vc dependence in machining process of C45.
Ultrasonic Welding of Amorphous and Semi Crystalline Materials
Authors: Das Chapal Kumar , Malas Asish , Pal Parthajit , Friedrich Sven , Gehde Michael
Published: July 2013

Ultrasonic welding have been studied using Polycarbonate (amorphous) and Polypropylene (semi-crystalline) in presence and absence of polymeric compatibilizer. A solution phase compatibilization has been used using Polycaprolactone, Polymethylmethacrylate and Maleic anhydride grafted Polypropylene. Cylindrical samples were used in the near and far field ultrasonication in order to achieve the better weldability. The welding strength was increased while utilizing the compatibilizer than that of un-compatibilized samples. Mixture of Polycarbonate and Polymethylmethacrylate on the PC phase enhanced the weld strength tremendously. The XRD analysis revealed the increase in crystallinity during the ultrasonication process resulting the enhanced weldability. The phase fusion is quite prominent from the SEM study of the fractured surface and also from the SEM of the welded portion. The FTIR study indicated the phase interaction through the compatibilizer thus enhancing the ultrasonic weldability of the thermoplastics.
Nanocrystalline Soft Magnetic Toroidal Cores of the Highest Relative Magnetic Permeability and Low Coercive Force
Authors: Tsepelev Vladimir
Published: July 2013

All the technologies of the melt quenching preparation ensure its time-temperature treatment to not only improve but also stabilize the metal structure and properties with every melt. The influence of annealing temperature of nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9 on the structure and magnetic properties has been investigated. The relation between numerical values of the coercive force, the initial magnetic permeability and the magnetic hysteresis loop rectangularity factor allows optimizing a mode of nanocrystalline alloy heat treatment.
Flame Spray Projection of a Bioactive Hidroxyapatite Coating on Ti6Al4V for Biomedical Applications
Authors: Santoyo Héctor Hugo Rodríguez , Flores José Martin Medina , Pingarrón Arturo Barba
Published: July 2013

This work consisted in the development and characterization of a bioactive coating on Ti6Al4V samples by flame spray projection. A synthetichidroxyapatite powder was used to form the coatings. Oxygen and acetylene gas were used as combustible, and the metallic substrate was Ti6Al4V with a roughness of 0.4 and 2.3 μm. The time process varied from 5 to 60 seconds. The projection distance was of 22 cm.The spray coatings were mechanical tested; in all cases, the results indicated that the coatings were well adhered to the metallic surfaces and the metallic subtracts did not present any degradation of the mechanical properties. In addition, the coatings were immersed in simulated body fluids for 21 days in physiological conditions to evaluate the bioactivity. The results demonstrated that the coatings are potentially bioactive through the formation of a dense and homogeneous apatite layer similar to the bone. Results of X-ray diffraction exhibited evidence of a hidroxyapatite layer and by energy dispersive spectroscopy, a Ca/P ratio of 1.57 was obtained. This is an indication of that the use of flame spray projection to coat Ti6Al4V substrates do not decompose the original hidroxyapatite powder. Compositional analysis of the remnant fluids, made by inductively coupled plasma spectrometry, showed that nonmetallic ions were present in the coatings.
Structural Mechanisms of Reinforcing Polymer Nanocomposites Filled with Carbon Nanotubes
Authors: Burya Alexander , Kozlov Georgiy , Gubskaya Maryana , Feng Xiang Ming , Qian Xiang Yang
Published: July 2013

t is shown that the structure of phenilon-based nanocomposites filled with carbon tubes represents the synergetic system. The degree of polymers reinforcement with non-aggregated carbon nanotubes is comparable with the correspondent index for exfoliated layer silicates (organoclay). As it should be expected, based on the most general principles, the reinforcement degree of the investigated nanocomposites is determined by three groups of factors: properties of the polymer matrix and nanofiller, and their level of interaction.
Polybenzimidazole Membranes Containing Benzimidazole Side Groups for High Temprature Polymer Electrolyte Membrane Fuel Cells
Authors: Yang Jing Shuai , Li Xue Yuan , Xu Yi Xin , Che Quan Tong , He Rong Huan , Li Qing Feng
Published: July 2013

Polybenzimidazole (PBI) with a high molecular weight of 69,000 was first synthesized. It was afterwards grafted with benzimidazole pendant groups on the backbones. The acid doped benzimidaozle grafted PBI membranes were investigated and characterized including fuel cell tests at elevated temperatures without humidification. At an acid doping level of 13.1 mol H3PO4 per average molar repeat unit, the PBI membranes with a benzimidazole grafting degree of 10.6% demonstrated a conductivity of 0.15 S cm-1 and a H2-air fuel cell peak power density of 378 mW cm-2 at 180 °C at ambient pressure without humidification.
Core-Shell Structured Fe3O4/PPy Microspheres with High Magnetization for Purification of Plasmid DNA
Authors: Jiang Hai Hui , Zhou Yan , Han Xiao Yun , Chen Xin Cheng , Hou Yun Hua , Gai Li Gang
Published: July 2013

Amino group-functionalized magnetic particles have wide applications in enzyme immobilization, DNA extraction, drug delivery, water purification, catalysis, and sensor. In this paper, Fe3O4/PPy microspheres with a well-defined coreshell structure have been prepared through an interfacial polymerization approach without surfactant. The magnetic composite spheres were characterized with XRD, FTIR, SEM, TEM, and magnetometry techniques, and further tested as the adsorbent to isolate plasmid DNA from Escherichia coli (E. coli) DH5α cells. The magnetic separation yields high-quality plasmid DNA in satisfying productivity as compared to the conventional phenolchloroform extraction.
Effects of Impulse Current on Plastic Behavior of 2A12 and 7A04 Aluminum Alloys
Authors: Yang Jun Jie , Li Yao , Xue Ping , Yu Wu Xin
Published: July 2013

Hard aluminum 2A12 and super hard aluminum 7A04 were adopted to conduct tensile tests in different conditions of impulse current. Effects of current density on elongationtensile strength and hardness were analyzed. In this experiment, thermal effect that impulse current exerted on aluminum alloy had little impact to plasticity. After adding impulse current, the elongation of aluminum alloy increased, but the tensile strength and hardness decreased. The elongation of the hard aluminum 2A12 could increase 53.4% and the elongation of the super hard aluminum 7A04 could increase 69.5% in certain condition.
Research on Flame Resistance of Filter Medium on Dust Removing
Authors: Wang Xiao Na , Liu Jing Xian , Chang De Qiang , Mao Ning , Sun Xi
Published: July 2013

Flame resistance is an important item for filter medium on some baghouse application with fire accident easy to occur. In order to choose the filter correctly to reduce the occurence of fire, based on the vertical flame method and the limit oxygen index method, some flame expriments are done for domestic polyphenylene sulfide filter, polyester fliter, Polyimide filter, PTFE fliter, foreign and domestic Polyphenylene sulfide and PTFE blended filter, foreign polyphenylene sulfide processed by PTFE latex ,domestic and foreign polyphenylene sulfide each accounted for 50% processed by PTFE.The results show that the flame resistance of Polyester filter is bad, and don't conform to the flame retardant standard. PTFE is good. The flame resistance of filter can be improved by filter blended with PTFE or post-processing of dipping with PTFE liquid.
Thermodynamic Calculation and Experimental Study on Complex Phase Steel
Authors: Zhao Jun Jie , He Yan Lin , Zhu Na Qiong , Zhang Mei , Li Lin
Published: July 2013

Using Thermo-calc software, transformation points as well as bainite starting temperature of the CP steel studied in the present work were calculated. Based on the measured CCT curve, the steels were treated at different conditions using Gleeble-3500 thermal simulation tester. To study the effects of cooling conditions on mechanical properties and microstructure of the steels after austenization, a combination of tensile tests at room temperature, SEM and TEM techniques was applied. Results showed that effective design of chemical composition and heat treatments can be achieved using Thermo-Calc software. The CP steel with carbon equivalent of 0.43% achieved B/M complex microstructure when austenized at 975 °C and followed by isothermal holding at bainitic transformation temperature of 450 °C. The tensile strength is 843.29 MPa and the elongation is 14.28%.
The Synthesis of 2-Oxo-1-Pyrrole Alkyl Propionitrile
Authors: Wu Guang Feng , Cao Shan Shan
Published: July 2013

The nucleophilic addition reaction was happened between 2-pyrrolidone and acrylonitrile in the toluene solvent using the PTC and sodium hydroxide respectively as phase transfer agent and catalyst. The nitrile fraction which seemed as pale yellow liquid was obtained by rectification. The effect of types and amount of PTC on gas chromatographic purity and yield of product were studied. The results showed that a better product could be obtained by using BTEAC as the catalyst compared to the CTAB and TBA. The optimum experimental condition was determined by the orthogonal experimental method. The yield was as high up to 94.2% when the quality score of BTEAC accounted for 0.5% of the total feeding mass, the concentration of aqueous solution of sodium hydroxide was 10%, acrylonitrile excessed 5%, gas chromatographic purity of the product was 98.5%.
Intercalation of Gold Nanoparticles into Na-Montmorillonite
Authors: Yao Peng Quan , Zhu Lin Hua , Si Tian , Yang Jin
Published: July 2013

Several type of gold precursors including pre-synthesized Au (en)2Cl3and gold colloid were tried to intercalate into the layer space of Na-Montmorillonite (Na-MMT). In the preparation, DDA and PAA were employed to cap the pre-synthesized gold colloidal particles and then intercalated into Na-MMT, and the Au (en)2Cl3was directly intercalated to Na-MMT through cation exchange. X-ray diffraction (XRD), fluorescence analysis (XRF) and transmission electron microscopy (TEM) were used to characterize the prepared samples. The results showed that the gold colloid modified by dodecylamine (DDA) and polyallylamine hydrochloride (PAA) respectively were successfully intercalated into the layer gallery of Na-MMT based on the mechanism of covalent capture. However, thermal treatment at 773K for 2h resulted in migration of gold nanoparticles from layer space to the out surface of the Na-MMT.
Self-Healing Epoxy Composites – Part II: Healing Performance
Authors: Yin Tao , Rong Min Zhi , Zhang Ming Qiu
Published: July 2013

Epoxy composites were provided with healing capability by pre-dispersing a novel repair system in the composites matrix cured by 2-ethyl-4-methylimidazole (2E4MIm). The healing agent consisted of ureaformaldehyde microcapsules containing epoxy and latent hardener CuBr2(2-MeIm)4 (the complex of CuBr2 and 2-methylimidazole). Single-edge notched bending (SENB) test were conducted to evaluate fracture toughness of the composites before and after healing. Moreover, healing efficiency was studied as a function of the content of the two-component healing agents. It was found that a healing efficiency of 173% relative to the fracture toughness of virgin composites was obtained in the case of 15 wt% epoxy-loaded microcapsules and 3 wt% CuBr2(2-MeIm)4.
Fabrication of High Aspect Ratio Microscale Rod Arrays Using Metal Injection Molding
Authors: Lee Won Sik , Jang Jin Man , Cha Berm Ha , Ko Se Hyun
Published: July 2013

In this work, micro rod arrays of 50 um and 200 um in diameter, respectively, were fabricated by 316L metal injection molding. Acryl sacrificial mold was used for the 50 um rod array. Aspect ratios were about 8 and 6 in 50 um and 200 um rod arrays, respectively and the bending of the rods occured due to high aspect ratio in debinding and sintering steps. Also, severe grain growth occurred at rod surface by sintering for 3 hrs at 1300°C and the average size was measured to be about 70 um.
Convergent Synthesis of Polyimide Dendrimers from an ABB' Intermediate
Authors: Hsieh Ching Wen , Chen Yi Hsin , Jeng Ru Jong , Dai Sheng Hong A.
Published: July 2013

A convergent synthetic approach was applied to 4-(2, 4-diaminophenoxy) phthalic acid ethyl esters (DAPPAcE) by reacting it with mono-anhydride in each successive step and this approach was found to be highly efficient in getting three generations of PI dendrimers than all known dendritc strategies carried out so far in PI preparation.The structures of prepared PI dendritic anhydride intermediates of three generations, [ and PI dendrimers, [, were all positively characterized by 1H-NMRFT-IR and mass spectrometry. GPC analyses showed molecular weight distributions are 1.02 (for [G-[B]), 1.04 (for [G-[) and 1.07 (for [G-[) indicating that they all possess narrow molecular distributions. All PI dendrimers have excellent thermal properties. The 5wt % loss temperature of intermediates [G-[ (X=1, 2, and 3) are between 383°C and 390°C, while their respective [G-[ PI dendrimers (X=1, 2, and 3) are between 412°C and 421°C. [G-[ (X=1, 2, and 3).They all exhibit good solubility behaviors in most organic solvents, and their solubility do not show any appreciable difference between generations.
Mutual Symbiotic Methanogenic Process between Acetotrophic and Hydrogenotrophic Methanogens during Anaerobic Digestion
Authors: Yin Fang , Zhang Wu Di , Huang Zun Xi , Xu Ling , Zhao Xing Ling , Liu Jing
Published: July 2013

Methaogens performing the final step in the anaerobic conversion of biomass to methane are members of the domain Archaea, which synthesis methane as the major product of their energy metabolism. Both acetotrophic and hydrogenotrophic methanogens are essential for the key step of methanogenesis.
Effect of Water Cleaning on Performance of Air Filtration Medias
Authors: Liu Xiao Pei , Bian Si Si , Chang De Qiang , Mao Ning , Liu Jing Xian , Sun Xi
Published: July 2013

Air filtration media are designed for disposable, but in some application, it should be used for some times with water cleaning. Through experiments, the performances of filter, which are cleaned with water for many times, including filtration efficiency, resistance, dust capacity are studied in the paper. The experimental results show that water cleaning has less effect on filtration efficiency, resistance and dust capacity of the filter media. Therefore, air filtration media can be used repeatedly by way of water cleaning.
Analysis of Leakage and Diffusion of Hazardous Chemicals Based on 3D Scene
Authors: Zhang Wei Shuai , Han Yun Peng
Published: July 2013

The paper bases on maximum allowable concentration (MAC) drawed up by the state, throughs the Gaussian plume model to calculate the spread area of hazardous chemicals, and puts the spread area into 3D scene. Thus, it can providers a visualization decision support tools for the commanding offcers.
A New Fluorescence Method for the Determination Trace Amounts of Berberine Using KAuI2
Authors: Wen Gui Qing , Li Ting Sheng , Jiang Zhi Liang
Published: July 2013

In the 0.02 mol/L HCl medium solution, berberine (BB) cationic ion and AuI2- combine to BB-AuI2 association complex molecule. These complex molecules self-aggregate to (BB-AuI2)n association particles. It exhibits a fluorescence peaks at 470 nm. A new and sensitive fluorescence method has been proposed for the determination of trace amounts of BB in the range of 10-800 ng/ml. The detection limit is 3ng/ml BB. The method has been applied to the determination of trace berberine in real samples, with satisfactory results. The cause of the fluorescence was also discussed.
An Anchor Filtering Localization Algorithm to Improve the Localization Accuracy of DV-Hop
Authors: Sun Chun Jie , Ye Zhi Hui
Published: July 2013

By calculating the average distances between each anchor and the unknown nodes, the anchor filtering localization algorithm filtered the anchors with smaller average distances, and chose qualified anchors to improve localization precision, especially in the non-uniform sensor networks. Simulation results showed that the proposed AFDV-Hop algorithm achieved higher positioning accuracy either in uniform or non-uniform sensor networks. The improvement of positioning accuracy became more obvious as the non-uniformity of the nodes increased. The node positioning errors were reduced 20%~30% and 40%~50% by AFDV-Hop algorithm when the non-uniformities of the node distributions were 10%~20% and 30%~40% respectively.
Research on near Field Acoustic Characteristic of a Compound Structure with Plate & Cylindrical Hull Subjected to Sound Excitation
Authors: Jia Di , Kang Feng Hui , Wang Yi Na
Published: July 2013

In order to study the acoustic environment of a ship sonar platform, near-field acoustic characteristic of a compound structure with plates & a cylindrical shell (CSPCS) subjected to sound excitation is researched based on numerical simulation. Influence of frequency and sound incident angle on acoustic environment of CSPCS are studied. Study shows that the sound pressure field distribution of CSPCS is complicated. Sound pressure would be strengthened and weakened in different locations when sound pressure uniformly incident into CSPCS. Result shows that the sound pressure distribution is highly dependent on frequency and incident angle. Sound pressure field is more evenly distributed when sound wave frequency is low. Study also shows that the incident angle has considerable influence on the sound field distribution of strengthened and weakened area.
Optimal Coefficient of Friction on Artificial Knee Joint Contact Surfaces
Authors: Hafis Mohd Bin Sulaiman , Farahana R.N. , Ridzuan Mohd Jamir Mohd , Adlina M.T. Nur
Published: July 2013

Wear generated by the presence of frictiononknee joint contact surfaces can cause debris, which may lead to failure of the artificial knee joint. In this study, the effects of friction coefficients occur on the knee joint contact surfaces were examined by Finite Element (FE) method. The knee joint was modelled to represent the contact surfaces between femur, meniscus and tibia. The measured angle from 0° to 15° was applied to analyze contact stresses for normal walking condition. It was found that the position angle of the knee joint at 10°offers the maximum value of contact pressure and shear compared to other knee joint position angles.Therefore, further examination was carried out and the FE results showed thattheoptimal friction coefficient was within the range of 0.1 and 0.15.
Towards an Application of PBD Principles for Innovative Recentering Beam-to-Column Connections
Authors: Hu Jong Wan , Choi Ga Lam
Published: July 2013

An unintended consequence is that some freedom in the introduction of innovative composite connections has been removed. The innovative aspects of this connection are in the use of partial restraint connections between steel beams and concrete-filled tube columns that utilize a combination of low-carbon steel and shape memory alloy components. A refined finite element model with sophisticated three dimensional solid elements was developed to conduct numerical experiments on the proposed joints to obtain the global behavior of the connection and develop simplified models. The paper argues that careful analytical studies can replace the requirement for physical testing present in current steel codes.
A Simple and Sensitive Fluorescence Quenching Method for the Determination of Trace IO3- Using Acridine Red
Authors: Wen Gui Qing , Li Ting Sheng
Published: July 2013

In the medium of HCl containing KI, acridine red (AR) exhibited a fluorescence peak at 550 nm, and acridine ornage (AO) has a fluorescence peak at 520 nm. Upon addition of IO3-, it reacts with excessive I-to form I3-. The AR and I3-combine to form an association particle that caused fluorescence quenching at 550 nm. IO3-concentration in the range of 5.0-120×10-7mol/L can be determined by AR fluorescence quenching method.
The Numerical Simulation of Electrical Characteristic for a New Material Antenna
Authors: Zhang Jing , Liu Chao , Zhou Liang , Dai Yu Feng
Published: July 2013

The traditional antenna is made up of metal or solid dielectric material, seawater is a new type of dielectric material for antenna. In this paper, numerical method (MoM) is used to calculate the input impedance of antenna formed by seawater, we compare its performance with traditional metal antenna while their radius and heights are changed, discuss its effect of input impedance and get the meaningful results, raise the application prospect of seawater antenna at the end of this paper.
Research of Line-Friction Multi Driving Belt Conveyor
Authors: Deng Yong Sheng , Zhang Yong , Zhou Tao , Zhou Yong Sheng
Published: July 2013

On the basis of analyzing the line friction belt conveyor transmission mechanism of driving forces, the calculation method of driving force, as well as the design essentials of this conveyor system were pointed out. According to the conditons that the line friction drive motor power, the driving belt tensile strength and its minimum tension, the calculation formula of transmission belt length were obtained respectively. Meanwhile according to the maximum tension that supporting belt permitted, the position of the driving belt would be confirmed. Line friction driving mode may reduce the conveyor belt maximum tension, that is, the belt with a lower intensity levels could be selected, thereby the cost of conveying belt would be greatly reduced.
Subjective Analysis and Objective Evaluation of Vehicle Sound Quality
Authors: Zuo Yan Yan , Zhou Shuai Li , Zhou Wen Feng
Published: July 2013

The interior noise samples from four cars at different positions and different speeds were selected as the evaluation objects. The subjective evaluation test of sound quality preference was carried out with paired comparison method. Several objective psycho-acoustical parameters of these samples were calculated. By way of linear correlation and multi-dimensional regression analysis, an equation between the subjective evaluation of noise preference and the objective psycho-acoustical parameters was established. The results indicate that the vehicle interior sound quality preference under the good highway and the constant-velocity driving conditions is affected mainly by two psycho-acoustical parameters Loudness and Sharpness.
Effect of Substrate Orientation and PH3 Thermal Annealing Treatment on Catalyst-Free InP Nanowires
Authors: Miao Guo Qing , Zhang Zhi Wei
Published: July 2013

Catalyst-free InP nanowires were grown on Si (100) and Si (111) substrates by metal organic chemical vapor deposition and the morphology, crystal structure, and optical properties of the nanowires are investigated. X-ray diffraction results show two peaks of InP (111) and InP (220) in the spectra. Two more peaks of InP (200) and InP (311) are observed if PH3thermal annealing is performed on the sample for 15 minutes after nanowire growth is completed. The InP (220), InP (311), and InP (200) peaks originate from InP crystal formation on top of the nanowires; only the InP (111) peak originates from the InP nanowires. Finally, the temperature dependence of the PL peak positions of InP nanowires grown on Si (100) and InP substrate are measured.
Synthesis and Characterization of ALaFeNi0.5W0.5O6 (A= Sr or Ca), a New Structure Distorted Double Perovskite
Authors: Allah A. Awad , Elhadi M. , Yassien O.A.
Published: July 2013

The crystal structure of both samples has been solved by powder X-ray diffraction, data in the tetragonal space group I4/m (a= b= 5.55182 Å, c =7.86955 A0) for SrLaFeNi0.5W0.5O6sample and (a=b= 5.49129Å, c= 7.82233Å) for CaLaFeNi0.5W0.5O6 sample, and shows an almost perfect ordering between Ni2+ and W5+ cations at the B-site of the perovskite structure. The FTIR spectrometer used of the powders showed that the spectra of both are very similar, showing two strong and well-defined absorption bands, typical of perovskite materials.
Research on the Preparation Technology of GaN Ultraviolet Photoelectric Detector
Authors: Sun Yuan Yuan , Zhang Xi He , Jia Qiu Rui , Li Zheng , Liu Shi Bo
Published: July 2013

GaN semiconductor was one of the most promising semiconductor materials with direct wide band gap transition. It was regarded as one of the most desirable materials to prepare short wavelength optoelectronic devices for the good optoelectronic properties and excellent mechanical behavior. In this paper, n and p-type GaN films were prepared on Al2O3 substrates by MOCVD. Through the optimization of parameters, we obtained effective in doped Mg and carrier concentration for 1019. MSM structural ultraviolet photoelectric devices were prepared on GaN film by two step epitaxy growth method. The highest transmittance and best epitaxial growth quality has been gained at 570°C for buffer layer of the samples.
Recycling of Kaolin Processing Waste as Aggregate in Asphalt Concrete
Authors: Ingunza Maria del Pilar Durante , Júnior Olavo Francisco dos Santos , Costa Cibele Gouveia
Published: July 2013

The aim of the present study is to assess the incorporation of kaolin processing waste as partial substitute for aggregates in asphalt concrete. Mixtures elaborated from the conventional mixture with the gradual incorporation of kaolin processing waste (5 to 40%) were evaluated by volumetric composition, mechanical behavior and susceptibility to moisture tests, obeying current Brazilian norms, according with international standards. The results show that the coarse kaolin waste displays grains with varying diameters, and, as such, can substitute part of the conventional aggregates and filler used in an asphalt mixture. Moreover, its mineralogical composition showed the same minerals in the composition of conventional aggregates used in paving. The assessment of the mechanical behavior of these mixtures indicate that the increased waste levels in the mixtures studied caused an increase in stability and a reduction in tensile strength. When susceptibility to moisture was considered, the results indicate that up to 25% of residue can be used as a substitute for conventional aggregates.
Influence of Grain Size and Rolling Direction on Stress Measurement by Ultrasonic Surface Wave (Part 2)
Authors: Preedawiphat Pavaret , Prateepasen Asa , Noipitak Mai
Published: July 2013

Stress measurement based on the change of ultrasonic surface wave has been accepted to find out residual or existing stress on material. This paper shows the effect of rolling direction and grain size of material on surface wave velocity and energy attenuation. Different grain and rolling direction of material type SS 400, S420 and A516 were selected to test its effect. Three grain sizes of each material were varied by normalizing process at three temperature range (no heating, 850°C, 980°C and 1160°C). Through transmission ultrasonic surface wave, frequencies 2.25 and 5 MHz, were applied and recorded the velocity and attenuation of the response. The results show that rolling direction and grain size slightly effect on attenuation of ultrasonic wave but unaffected on sound velocity. Its outcome was compared with the effect of the material coating.
The Potential Application of Light-Emitting Diode on Biodecolorization of Azo Dye
Authors: Wu Wen Tung
Published: July 2013

In the previous study, the decolorization of azo dye was significantly enhanced by the light irradiation. The aim of this study is to investigate the effect of methyl orange decolorization under light-emitting diode (LED). The effect of media, pHs, and nitrogens on methyl orange decolorization by freely suspended cells are examined. The results showed that the optimal conditions for the methyl orange decolorization by theTsukamurellasp. J8025 are incubation at 30 °C and pH 8.0 in YEME medium under white-light LED.
Sensitivity Analysis of Factors Affecting Asymmetric Deformation of Roadways in Steep Inclined Coal Seam
Authors: Fan Long , Zhong Jiang Cheng , Han Bin , Dong Meng
Published: July 2013

There isn`t clear definition of steep inclined coal seam at home or abroad at present. Generally,the inclined coal seam with 35°~55° inclination is called steep inclined coal seam in mining field [. During the mine program in steep inclined coal seam,due to its special formation of roof and floor,not only perpendicular pressure to coal seam is distinct,but also the component of gravity along the direction parallel to coal seam is significantly increased and the parallel pressure which causes slippage of roof and floor is the main factor resulting in the distinct roadway transformation. Uncertainty and asymmetry transformation or destroy of roadways brings great difficulties to the mine of steep inclined coal seam,especially for the asymmetry transformation which is a huge challenge to the support of roadways,so it`s necessary to summary and analyse the factors affecting asymmetry transformation of roadways in steep inclined coal seal. Through classifying these factors by the main and secondary,this paper will provide reference for reasonable arrangement of roadways and effective support scheme in steep inclined coal seam. Many scholars did some research in laws of roadway deformation in steep inclined coal seam,but few of them compared or did sensitivity analyse of these factors. Zhang Bei etc. built the numerical simulation models of roadways with different inclination and found the key position of the deformed surrounding rocks [;Sun Xiaoming etc. aimed at the asymmetric deformation of surrounding rock around deep roadways and investigated its failure mechanism and coupling control countermeasure [;Cao Shugang etc. analysed the stress distribution rules of roadways in steep inclined and medium coal seam by ADINA program and put forward some control measures [. In different inclination conditions, this paper simulates asymmetry deformation of roadways with different section form in steep inclined coal seam through FLAC3D program and analyses the sensitivity of these factors affecting asymmetric deformation.
Effects of Process Parameters on Material Removal Rate and Arithmetic Surface Roughness in Rubber Carbon Black Cutting by EDM
Authors: Potejana Potejanasak , Thavorn Erawin , Thongchattu Chakthong
Published: July 2013

This research proposes a new application of Electrical Discharge Machine (EDM) for cutting the rubber carbon black. The new material of this study was a natural rubber mixed with carbon black for increased electrical conductivity of natural rubber. was accomplished through the technique of design and analysis of experiment and statistical analysis. The 24 Full factorial design was selected to conduct the experiment to determine the optimal mixed rubber cutting process parameters. The study has been carried out on the influence of design factors of the concentrate amount of carbon black per hundred of natural rubber (PHR), the voltage across the gap between and electrode tool and workpieces (Volt), the value of the discharge current (Ampere), and the duration of time (On-time, μs) that current is allowed to flow per cycle over response variables arithmetic surface roughness and material removal rate. The experimental results have shown the value of the discharge current that significantly affect to the degree of material removal rate of rubber mixed with carbon black and the duration of time that significantly affect to the degree of arithmetic surface roughness.
Seismic Fragility Analysis of RC Industrial Frames Based Stochastic Vibration
Authors: Chang Pei Ju , Zhu Jian
Published: July 2013

This study focus on derivation of such fragility curves using conventional industrial frames with masonry infill wall. A set of stochastic earthquake waves compatible with the response spectrum of China seismic code selected to represent the variability in ground motion. Dynamic inelastic time history analysis was used to analyze the random sample of structures. Industrial structural seismic capability of longitudinal and transversal orientation is different. Stochastic damage scatter diagrams based different seismic intensity index are obtained. Seismic fragility of longitudinal axis (X axis) is larger than transversal axis (Y axis) of frames under major earthquake obviously.
Application of Antiwear Pipelines in Thermal Power Plants
Authors: Pan Chun Hui , Diao Li Jing , Wang Huan Yun , Fu Miao Miao
Published: July 2013

Coal powder pipelines are vulnerable to abrasion, resulting in a great waste of metal materials, manpower and funds as well as serious environmental pollution, Which is a common and chronic problem in thermal power plants. After analysis of the action mechanism and performance of the anti-wear materials, this paper provides a reference for the technological transformation of thermal power plants.
Study on Flywheel Rotating System Using Aerodynamic Energy of Running Vehicle
Authors: Lee Jong Jo , Kim Jong Woo , Lim Jae Kyoo
Published: July 2013

Mechatronics is an integration technology which is the mutual penetration of mechanical technology, microelectronic technology and information technology and the inevitable development trend of electromechanical industry. This paper describes the overview, core technology and main application fields of mechatronics technology and points out its development trend.