bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Criteria to Evaluate a Kinematically Redundant Robotic Cell for Machining Tasks
Authors: Subrin Kévin , Sabourin Laurent , Gogu Grigore , Mezouar Youcef
Published: March 2012

Machine tools and robots have both evolved fundamentally and we can now question the abilities of new industrial robots concerning accurate task realization under high constraints. Requirements in terms of kinematic and dynamic capabilities in High Speed Machining (HSM) are increasingly demanding. To face the challenge of performance improvement, parallel and hybrid robotic architectures have emerged and a new generation of industrial serial robots with the ability to perform machining tasks has been designed. In this paper, we propose to evaluate the performance criteria of an industrial robot included in a kinematically redundant robotic cell dedicated to a machining task. Firstly, we present the constraints of the machining process (speed, accuracy etc.). We then detail the direct geometrical model and the kinematic model of a robot with closed chain in the arm and we propose a procedure for managing kinematic redundancy whilst integrating various criteria. Finally, we present the evolution of the criteria for a given trajectory in order to define the best location for a rotary table and to analyze the manipulators stiffness.
Positioning and Orientation Requirements for Robotic Assembly by Insertion
Authors: Tabără Iulian Alexandru
Published: March 2012

Based on the relative positions of the parts to be assembled, positions imposed by the technological process of insertion, the conditions required to perform a predetermined operation have been defined. The relations that express the relative positions and orientations of the axes of the parts to be assembled have been determined. These expressions enable the establishment of the functional requirements imposed on the robot. We have taken into consideration the influence of robot accuracy on its positioning and orientation repeatability.
A New Approach to the Classic Structure for Robotic Arc Welding Systems
Authors: Joni Nicolae
Published: March 2012

Starting from the analysis of the modern robotic arc welding system from the kinematic point of view, the paper presents an original concept of the systems structure. Instead a combination of two open chains, as it is generally seen, the author proposes one single closed kinematic chain. The main element of this chain is the electric arc employed for welding, virtually seen as a vector which connects the two open chains, the robot and the part manipulator. This new approach could possibly change and simplify the way arc welding robots are programmed today.
Research on Determining the Pose Errors in a Robot Welding Cell Using Theodolits
Authors: Buciuman Cella Flavia , Vacarescu Valeria
Published: March 2012

In this article, the authors aim to develop a method for determining the components errors of a robotic welding cell, using coordinate transformations between the reference systems attached to the cells components. Errors are expressed as matrices, as it is usual in the mathematical expressions used in robotics. Errors mathematical modeling refers to the positioning error and also to the orientation error. Therefore, a test cube is used. The experiments presented in the paper, approaches only the positiong error (AP). The method is used for measuring the pose errors of a welding cell, using two theodolits. The method is based on measuring the coordinates of a target characteristic point TCP, the corner of a test cube, relative to a coordinate system attached to one of the two theodolits. It is part of the no contact measurement methods. The main principles of the method and its theoretical basis are validated by experiments, conducted in a welding cell, using a robot CLOOS-Romat in the Robotics Laboratory of the University "Politehnica" of Timisoara.
The Anthropomorphic Six Axis Robot as an Appropriate Tool for Automatic Gas Pipe Welding Process
Authors: Iovănaş Radu , Joni Alexandru , Staretu Ionel , Iovanaș Daniela Maria , Iovanas Razvan Florin
Published: March 2012

This paper presents current technologies used for pipe welding. Welding processes such as Tandem and Hybrid (Laser-GMAW) welding are compared to regular 1-wire GMAW. The device used for positioning the welding head is an anthropomorphic robot, as this type of robot provides everything needed for the application: low cost, flexibility, sufficient payload and precision.
A Softness Feeling Display with an Active Tensioner Controlling Contact Pressure Distribution on a Fingertip
Authors: Kimura Fuminobu , Yamamoto Akio
Published: March 2012

This paper describes a tactile display for softness feelings with a function of controlling contact area and pressure distribution. Contact area between a fingertip and a display is controlled by wrapping a flexible film around a finger. An active tensioner controls the tension of the flexible film to modify the contact pressure distribution. Controlling both area and pressure distribution realizes rendering of wider range of softness feelings. The effect was verified using photoelastic phenomenon. The experimental results show that the display can render the different contact conditions that arise from two differently-felt sponge samples with different thicknesses.
A Three-Dimensional Spatiotemporal Sensor by Means of a Heterogeneous Biaxial Camera System
Authors: Blanco Max , Malaterre Laurent
Published: March 2012

The capabilities of a biaxial camera system to verify control loops are investigated here with the verification of a Cartesian robot. The biaxial camera system will serve in the future as a tool to investigate the three-dimensional trajectories of insects, projectiles and other airborne devices. Three-dimensional motion is measured by means of two cameras arranged at right angles to each other with a common focal point. Control loop instructions to the robot allow it to simulate a circular orbit. The control system for the Cartesian robot is documented. The biaxial camera system allows an elliptical least-squares minimization algorithm to be employed to measure the phenomenon produced by the Cartesian robot.
2D Legendre Moments-Based Visual Control
Authors: Tamtsia Aurelien Yeremou , Mezouar Youcef , Martinet Philippe , Djalo Haman , Tonye Emmanuel
Published: March 2012

Among region-based descriptors, geometric moments have been widely exploited to design visual servoing schemes. However, they present several disadvantages such as high sensitivity to noise measurement, high dynamic range and information redundancy (since they are not computed onto orthogonal basis). In this paper, we propose to use a class of orthogonal moments (namely Legendre moments) instead of geometric moments to improve the behavior of moment-based control schemes. The descriptive form of the interaction matrix related to the Legendre moments computed from a set of points is rst derived. Six visual features are then selected to design a partially-decoupled control scheme. Finally simulated and experimental results are presented to illustrate the validity of our proposal.
Rollover Prevention System Dedicated to ATVs on Natural Ground
Authors: Richier Mathieu , Lenain Roland , Thuilot Benoit , Debain Christophe
Published: March 2012

In this paper, an algorithm dedicated to light ATVs, which estimates and anticipates the rollover, is proposed. It is based on the on-line estimation of the Lateral Load Transfer (LLT), allowing the evaluation of dynamic instabilities. The LLT is computed thanks to a dynamical model split into two 2D projections. Relying on this representation and a low cost perception system, an observer is proposed to estimate on-line the terrain properties (grip conditions and slope), then allowing to deduce accurately the risk of instability. Associated to a predictive control algorithm, based on the extrapolation of riders action, the risk can be anticipated, enabling to warn the pilot and to consider the implementation of active actions.
Robot Vision Application for Bearings Identification and Sorting
Authors: Pop Cristian , Grigorescu Sanda , Davidescu Arjana
Published: March 2012

An automated object recognition application type, implemented on a robotic platform, is described. It is based on an image processing algorithm that enables: the detection of objects like bearings from a pallet conveyor, the identification of bearings type and the calculus of position and orientation, in order to be manipulated by a SCARA robot. The identification algorithm developed in Matlab software consists in HSV image segmentation and a matching technique based on comparison with previous given set of bearing prototypes. The methods used for camera and robot calibration are also described.
Mechatronical Approach of Analyzing One DOF Leg Mechanism in Order to Construct a Walking Robot System
Authors: Moldovan Florina , Dolga Valer , Dobra Andreea
Published: March 2012

A mechatronic integrated approach regarding the modeling, analysis and design of one DOF leg mechanism configuration is presented. This mechanism will be implemented in the structure of a walking robot and its configuration is inspired from Jansens type of walking mechanism. The trajectory shape described by the end point of the leg during a walking cycle is analyzed based upon a 2D model developed in Matlab. A mathematical model that consists in structural analysis and equations regarding three types of kinematic constraints proposed for synthesis process is briefly described.
Experimental Evaluation of the Pitch Angle Righting Capabilities of a High Speed Terrestrial Vehicle in Ballistic Phase
Authors: Davis Marc , Vaslin Philippe , Fauroux Jean Christophe , Gouinaud Christophe , Ju Liang
Published: March 2012

We present a study of the feasibility of controlling the pitch angle of a high velocity ground vehicle in ballistic phase by accelerating or decelerating its wheels. The vehicle performed several jumps, and various wheel acceleration commands were sent to it while it was airborne. Images were recorded using a high-speed video camera, and the trajectories of markers placed on the vehicle were analyzed in order to measure the relationship between the changes in angular velocities of the chassis and the wheels. It appeared that it was possible to achieve pitch righting through the modification of the angular velocities of the wheels with adequate performance, thus opening the road towards automated control of pitch, then later yaw and roll angles.
High Quality Document Digitization Equipment
Authors: Ciupe Valentin , Lovasz Erwin Christian , Gruescu Corina Mihaela
Published: March 2012

The paper describes an equipment specialized in digitization of single documents, journal-type documents and books. The equipment is designed and assembled at Politehnica University of Timisoara and works in a station developed within the European project thinkMOTION. The optical calculus aimed optimal illumination of two symmetrical areas and high quality of captured images. The object of scanning is printed matter, which exists exclusively in paper form and originates from different periods of scientific evolution. The mechanical design was based on criteria such as: flatness of active surfaces, quick placement and removal of the original document, mechanical raw focusing facilities, adjustment regarding the thickness of the original document and finding constructive solutions so that no damage is inflicted upon the original document, which may be one of a kind and, hence, historically very valuable. An original software was created in order to control the scanning process, to organize files and folders, which stock captured images in different stages of processing. The effective efficiency of the equipment is 10 12 pages/minute.
Providing Configurability and Plug-and-Play Capability to Simple Sensors: A Step towards Smart Sensors for Smart Factories
Authors: Murar Mircea , Brad Stelian
Published: March 2012

A modality to boost up the abilities of simple sensors for providing extended configurability options and plug-and-play capability along with great scalability, integrability, rapid customization and modularity is reported in this paper. An embedded architecture that requires both electronic and software designs is employed for expanding sensor capability. Self-integration, configuration, data computation from the sensor, analog-to-digital data conversion and data processing relative to configuration options are investigated. Based on the approach proposed, an embedded sensor-system, consisting of a network of microcontrollers and sensors capable to respond to configurability and fast integrability requirements, is built and tested within this research. Tests have shown the smart sensor-system is functional, feasible, cost-effective, easy-to-use and highly reconfigurable. Integration of such sensors within reconfigurable, autonomous and distributed manufacturing systems is thus possible.
Theoretical Study on Stem Implants Behaviour
Authors: Sticlaru Carmen , Davidescu Arjana
Published: March 2012

The paper presents a complex study on hip joint endoprosthesis. The model for the femur was obtained by CT scanner and Mimics, the endoprosthesis was designed in proEngineer. This study has two stages: obtaining the 3D model for the bone and endoprosthesis, analysing the model in Ansys to obtain stress and strain state information. The paper also presents some interesting aspects of the contact between the bone and the implant in case of different types of endoprosthesis (two standardized types and one personalized). A good contact between the bone and the stem indicates a long life solution for an endoprosthesis. A personalized stem is very useful for persons with disabilities is designed taking in consideration the particularities of the patient. The contact results from Ansys illustrate the aspects from the bone stem interface. With this information the orthopaedist can take better decisions for a proper hip joint endoprosthesis used for a named patient.
Research on Squirrel-Cage Induction Generator Full Power Converter Control Strategies of Wind Power Generation System with Dynamic Systems
Authors: Mei Bai Shan , Jiang Han Kun , Yu Jiang
Published: March 2012

In this paper, a new control scheme of a variable speed grid connected wind energy generation system was presented. The scheme used a squirrel-cage induction generator (SCIG) as generator and it connected to the grid through a back-to-back double PWM converter. According to the characteristics of induction motor, the generator side adopted rotor flux linkage oriented slip frequency vector control technology, and the grid side used the network voltage oriented control and voltage and current dual close-loop control strategy. The simulation results show that the system can work in the state of variable speed constant frequency (VSCF)power generation and the active and reactive power can be controlled with no mutual interference and with good static-dynamic performance.
Fractal Model for Thermal Conductivity of Wetting, Fibrous Porous Media
Authors: Zhu Fang Long , Xia De Hong , Zhou Yu
Published: March 2012

The current paper deals with the fractal effective thermal conductivity model for fibrous porous media containing unsaturated water moisture. The model is based on the thermal-electrical analogy and statistical self-similarity of porous media. The fractal effective thermal conductivity model can be expressed as a function of the pore structure (fractal dimension) and architectural parameters of porous media. It is expected that the model will be helpful in the evaluation of thermal comfort for textiles in the whole range of porosity.
Life Cycle Cost Analysis of Anticorrosive Coating of Steel Bridge
Authors: Liu Pan
Published: March 2012

This paper is about a design to steel structure anticorrosive coating of one domestic bridge which is 100-year design Life by using the latest life cycle cost analysis (LCC).With comparing the fees of four painting program, the most optimized economic is program IV, that is arc spraying aluminum、dilution epoxy MIO, universal epoxy antirust paint and polyurethane topcoat system. It has a important guiding significance to design anti-corrosion coating of other bridge steel structure.
Preparation and Characterization of Thermally Expandable Microcapsules by In Situ Polymerization
Authors: Wang Xue Bao
Published: March 2012

In the present work, we synthesized microcapsules with copolymer of acrylonitrile and ethyl acrylate as shell and isooctane as core by in situ polymerization, and then optimized the preparative method. Synthesized microcapsules were characterized by Fourier transform infrared spectroscopy (FTIR), 13C nuclear magnetic resonance (13C-NMR), scanning electron microscopy (SEM), particle diameter analysis and thermogravimetry (TG).
Processing and Mechanical Properties of Starch and PCL Composite Reinforced by Nano-SiO2
Authors: Liu Wen Yong , Chen Yi , Ouyang Long , Liu Yue Jun , Hao Xi Hai
Published: March 2012

The thermoplastic processing and mechanical properties of starch and polycaprolactone (PCL) composites reinforced by nano-silica (nano-SiO2) were studied. The results showed that the mechanical properties of the starch/PCL blends improved significantly with the increase of PCL. After the addition of nano-SiO2, the mechanical properties of the starch/PCL blends further improved. When the weight percent of nano-SiO2 was 1.8%, the mechanical properties of the SiO2/TPS/PCL composite were most excellent. By comparison with the starch/PCL (50/50) blends, the tensile strength of the SiO2/TPS/PCL composite with 1.8% SiO2 was increased by 20% and the elongation increased by 33%. Moreover, it was confirmed by rheological measurements that nano-SiO2 could interact with the composite materials, which results in the improvement of the mechanical strength of the TPS/PCL composites.
Effects of Substrate, Solvent, Graft Density and Graft Length on the Formation of Cellulose-Based Ordered Porous Film
Authors: Liu Wen Yong , Chen Yi , Liu Yue Jun , Hao Xi Hai
Published: March 2012

We investigated the preparation of porous film of cellulose-based graft copolymer by breath figure method. The effects of substrate, solvent, graft density and graft length on the formation of porous film were elucidated. The results showed that ordered porous films could be facilely formed on the glass and mica substrate, while no ordered porous films were obtained on the silicon substrate. The ordered porous films were formed from the copolymer/CS2 solution, while no ordered porous films were done from the copolymer/CH2Cl2, CHCl3 and toluene solution. Moreover, no ordered porous films were obtained from the copolymer with spare graft density or with long side chain. The results indicated that the substrate, solvent, graft density and graft length had important effects on the ordered porous film.
Methyl Orange Degradation on TiO2 and Mixture of TiO2 and HZSM-5 in NaHCO3 Solution
Authors: Sun Yu Feng , Chen Jin Lei , Zhang Wen Jie
Published: March 2012

Methyl orange decoloration was conducted in the solution containing NaHCO3. TiO2 and the mixture of TiO2 and HZSM-5 were used as the photocatalysts. The addition of TiO2 greatly changed adsorption of methyl orange in solutions containing different concentration of NaHCO3. The existence of NaHCO3 can improve photocatalytic degradation of the dye under UV irradiation in the solution containing TiO2. As high as 55% decoloration of the dye occurred in the solution containing 1.0 mol/l NaHCO3. When NaHCO3 concentration was lower than 0.08 mol/l, adsorption of the dye was fairly weak on the mixture. At the same time, decoloration of the dye deceased with increasing NaHCO3 concentration. When NaHCO3 concentration was high, adsorption and decoloration of the dye were better at higher NaHCO3 concentration.
Porous B-TiO2 Prepared by Sol-Gel Method Using Boric Acid as Boron Source
Authors: Sun Yu Feng , Li Ke Xin , Zhang Wen Jie
Published: March 2012

Three kinds of templates were used to prepare porous boron doped TiO2 based photocatalysts by sol-gel method. Adsorption of methyl orange on the materials maintained with very slight variation in template adding concentration. With increasing PEG1000 concentration, photocatalytic activity of the material presented obviously variation. The optimal concentration appeared at 0.08 mol/l, where methyl orange degradation rate was 24.7%. When PEG400 concentration was 0.14 mol/l, photocatalytic degradation rate of methyl orange on the material was 17.9%. In the template concentration range from 0.06 mol/l to 0.16 mol/l, degradation activity occurred at CTAB concentration of 0.10 mol/l showed the optimal value of 31.1%, which was the highest among the three kinds of templates.
Carbon Footprint Inventory, Estimation and Analysis System in a RC Building Materials
Authors: Lu Li Teh , Chang I Cheng
Published: March 2012

The construction industry is one part of economic development critical to a nation’s infrastructure. However, there is significant man-made “Greenhouse Gas (GHG)” generated during the construction industry’s any Life Cycle (LC).We tailor actions to suit local circumstance and made a systematically preliminary investigation of an inventory, estimation and analysis system currently available in estimation of carbon footprints of an ordinary RC building in Taiwan. There are about 60% of carbon footprints derived from production or usage of high carbon emission building material steel bars.
Photocatalytic Activity of B-TiO2 Prepared Using Boric Acid as Boron Source
Authors: Zhang Wen Jie , Li Ke Xin
Published: March 2012

Boron doped TiO2 photocatalysts was prepared by sol-gel method. The influences of Boric acid amount, reaction time and calcination temperature on photocatalytic activity of the prepared B-TiO2 were studied. The boron doped TiO2 had small adsorption capacity. 38.8% of the initial methyl orange was degraded on the sample prepared with 1% B2O3 after 30 min of irradiation. After 120 min of irradiation, nearly 100% of the methyl orange was degraded on the material. Photocatalytic activities of the boron doped TiO2 materials increased from 400 oC up to 500 oC. After that, degradation activity decrease with further increase of calcination temperature in the range from 500 oC to 600 oC.
Porous TiO2-Al2O3 Photocatalyst: The Effects of Calcination Time
Authors: Zhang Wen Jie , Xin Hong Liang
Published: March 2012

Porous TiO2-Al2O3 composite materials were prepared through sol-gel method after calcination at 500 oC for different time. FT-IR spectra of porous TiO2-Al2O3 composite materials revealed that the samples are composed of Al2O3 and TiO2. The sample calcinated for 2.5 h had the maximum specific area of 128.9 m2•g-1. High pore volume and average pore size were possessed by the samples calcinated for 1 h and 3 h. While being calcinated at 500 oC, photocatalytic activities of the materials increased at first and then dropped down with the increasing calcination time. The sample calcinated for 3 h showed the maximum activity of 35%.
On the Absorbability of Lead Chrome Yellow by Using Active Floridin
Authors: Shu Ming Yong , Liu Guang Hui , Yin Hai Ying
Published: March 2012

Taking the active floridin prepared by mixed acids as absorbent, its absorbability and absorption capacity of lead chrome yellow are studied. The research results indicate that the initial concentration of wastewater is advantageous for improvement of the active floridin absorbability. Larger dosage of active floridin results in greater removal rate of lead chrome yellow but smaller absorbability; higher temperature of the wastewater causes weaker surface absorbability of active floridin and thus the absorbability and removal rate of lead chrome yellow are lower; greater ph value of wastewater brings more severe damage on the lamellar structure of active floridin, as well as lower absorbability and removal rate accordingly.
Modification of Glucose Oxides Sensors Using Colloidal Gold Nanoparticles
Authors: Fakhrabadi N. H. , Rohani A.A. , Farahbakhsh Afshin
Published: March 2012

Glucose oxidase sensor is one of the best methods for measuring small amounts of glucose; this sensor can be modified using colloidal gold nanoparticles as complementary substance in the electrode structure with the aim of increasing efficiency. In this article, the colloidal gold nanoparticles (24 nm) were used to construct the two electrodes. The first electrode (Au/CP) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil and 300 µl colloidal gold nanoparticles. The second electrode (Au/CILE) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil, 300 µl colloidal gold and 50 mg ionic liquid oppf6. To evaluate the performance of each electrode and to prepare of bio sensor, these were covered by solution of 10 mg glucose oxidase and 1 ml phosphate buffer. The bio sensors were test with 0.8 mM glucose solution. By comparing the amount of AMP and the transfer time for both, the according results, the effect of colloidal gold nanoparticles on the increasing conductivity, sensitivity and stability biosensor, was determined.
The Coherent Transport Properties of Electrons in a 4-Terminal Nano Device with Rashba Spin-Orbit Coupling in the Presence of Magnetic Field
Authors: Wang Hui Xian , Li Li Ben , Kang Da Wei , Liu Hui Hui
Published: March 2012

We investigate the coherent transport properties of electrons in a side terminal of a four-terminal nano device made of quantum wires with Rashba spin-orbit (SO) coupling in the presence of magnetic filed. We numerically calculate the charge and spin conductances dependent on SO coupling strength and reduced flux. The results imply that the coherent transport in this device is determined by the interplay of Rashba SO coupling and magnetic filed. For specific values of magnetic flux and SO coupling strength, a complete blocking can take place. It also shows that there is a de-blocking phenomenon induced by the interplay of magnetic flux and SO coupling. Such a 4-terminal and multi-channel structure may provide more options of controlling methods for the coherent charge and spin transport.
Biocorrosion of Biodegradable Implant Mg-xCa-4Zn Alloy in Simulated Body Fluid with the Addition of Ca
Authors: Wang Ji Jie , Feng Yue Jiao , Cui Tong , Jiang Da , Li Na , Wang Yan Jing
Published: March 2012

The effect of Ca on the microstructure and corrosion properties was investigated. Vacuum induce melting was used to obtain the Mg-xCa-4Zn (wt.%) (x = 0%, 1%, 2% and 3%) alloys. Erode test was carried out in the Hank’s simulated body fluid for the alloys and the increasing of weight is carefully measured. The microstructure of the alloys was observed with optical microscope and energy spectrum analysis was used for accurate composition. It is found that as the increasing of Ca, the corrosion extent is getting serious for the Mg-xCa-4Zn alloys. Hardness increases as the adding of Ca in the alloys.
Separation of Glycomacropeptide (a Functional Protein Material) by Aqueous Two-Phase Systems
Authors: Wu Jiang , Wang Yu , Huang Liang
Published: March 2012

PEG/ ammonium sulfate aqueous two-phase systems were supplied to separate GMP. It was found that PEG molecular weight, PEG concentration and ammonium sulfate concentration could influence the partitioning of GMP. The data of experiment showed that 18% (w/w) PEG6000 and 15% (w/w) ammonium sulfate were the optimum system, in which the protein recovery was 69.2%
Analysis on Active Behavior of Wheat Straw by Py-GC-MS
Authors: Guo Hai Yan , Zheng Zhen Zhen
Published: March 2012

In order to find out its active behavior, the extractives of wheat straw biomass were adsorbed and determined by Py-GC-MS. And the main constituents were eicosane, stigmasterol, 22,23-dihydro-, .gamma.-sitosterol, stigmasterol, campesterol, nonacosane, stigmast-4-en-3-one, lup-20(29)-en-3-one, 13-tetradecen-1-ol acetate, 1,3-butadiene, 2- methyl-, 9-octadecenoic acid, (e)-, acetic acid, stigmast-5-en-3-ol, oleate, 1-nonadecene, heptacosane, 4,22-stigmastadiene-3-one, 4-((1e)-3-hydroxy-1-propenyl)-2- methoxyphenol, 1-heptene, 2-isohexyl-6-methyl-, etc.
Analysis on Pyrolytic Behavior of Wheat Straw Multifunctional Materials by Py-GC-MS
Authors: Zhang Zhong Feng
Published: March 2012

In order to learn of pyrolytic behavior of wheat straw multifunctional materials, the extractives of wheat straw biomass were adsorbed and determined by Py-GC-MS. And the main constituents were stigmasterol, vitamin e, campesterol, .gamma.-sitosterol, stigmasterol, 22,23- dihydro-, nonacosane, stigmastan-3,5,22-trien, heneicosane, lup-20(29)-en-3-one, 1,2- benzenedicarboxylic acid, buty l 2-methylpropyl ester, stigmast-4-en-3-one, stigmastan-3,5-diene, 4,22-stigmastadiene-3-one, cholest-5-en-3-ol (3.beta.)- , pyridine-3-carboxamide, oxime, etc.
Measurement on Pyrolytic Active Materials of Wheat Straw Biomass by Py-GC-MS
Authors: Wang Ai Jun , Qiao Jian Zheng
Published: March 2012

In order to find out its active materials, the extractives of wheat straw biomass were adsorbed and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)- (31.32%), 1,3-pentadiene,(z)- ( 4.5%), cyclobutene(2.17%), 1-nonadecene(2.12%), etc.
Research of Preparation and Ultraviolet Shielding for Nanometer Powder of Tin Dioxide Coated with Zinc Oxide
Authors: Wang Yuan Rui , Qiang Guo Jun , Liu Feng Juan
Published: March 2012

The preparation of tin dioxide coated with zinc oxide nanometer powder by factional homogeneous precipitation method is reported in this paper. The diameter of prepared nanometer powder is 32nm. UV shielding , XRD, SEM and EDS of prepared nanometer powder have been investigated. The results show that tin dioxide coated with zinc oxide nanometer powder has excellent UV-shielding performance , and the UV shielding characteristic is better than single tin dioxide or zinc oxide used.
Study on the Molding Process of Nano-Ceramics
Authors: Zhang Zhan Xin , Bo Hui Feng , Wang Ru Zheng
Published: March 2012

Nano-ceramics with excellent strength, toughness, oxidation resistance, corrosion resistance and the like metals superplasticity show an attractive application prospect. However, the production of high density of nano-ceramics is very difficult. This paper focuses on the preparation of concentrated suspension slurry, the main technical parameters and the additive proportion of raw materials. The optimum dosage of dispersant PAANa is 1.4wt%. When the PH value is about 9, the best stability of slurry is achieved. When the milling time reaches 10h, the lowest viscosity is reached. The solid content viscosity of slurry increases with the decrease of the slurry temperature. Solid phase volume with 40vol% of slurry can be successfully cast out the mould homogeneously.
Preparation and Characterization of Novel Nano-ZnO/Polystyrene Resin Composite
Authors: Xu Shuang , Jiao Yang , Song Nuan , Li Jun , Ding Chang Hong
Published: March 2012

A nano-ZnO/polystyrene resin composite was prepared by adsorption nano-ZnO predecessor (Zn2+) onto macroporous strong acid cation exchange resin, denoted as D001, followed by chemical precipitation. The framework FT-IR spectrums showed new adsorption bands at ca. 1615 cm-1 and ca. 530 cm-1 were observed in ZnO@D001 compared to D001, and vibration peak shift in D001 was found from 1001 cm-1 to 1080 cm-1 in ZnO@D001. The specific surface area declined a litte, but pore volume and average pore diameter declined a lot when nano-ZnO immobilized onto D001. All of above results demonstrated the nano-ZnO particles immobilized on the inner nano-pores/channels of D001 successfully. The coefficient of volume and surface resistance (ρV, ρS) values of ZnO@D001 were lower than 104 Ω•m, indicating its excellent antielectrostatic ability.
Deposition of Metal Clusters into the Functionalized Metal Organic Frameworks
Authors: Gu Ying , Zhu Yuan Shuai , Li Bao , Chen Wu Lin
Published: March 2012

Utilizing first-principles density functional theory calculations, we identify that weak adhesion of metal clusters (for example Cu and Au) on pristine MOF-5, IRMOF-3, IRMOF-3-OH and IRMOF-3-SH, which reveals that metal clusters may be unable to stably exist in the pore of MOFs. Furthermore, upon removing the hydrogen of NH2, SH and OH functional groups, the adsorption energy between metal cluster and functionalized MOFs improve, which ascribes to chemical adsorption. Meanwhile, these metal clusters become cationic as a result of the formation of metal-O, S or N adhesion bonds. Hence, our study may provide a candidate approach to deposit metal clusters into the pore of MOFs.
Analysis Xe-Lamp Selection Methods on Full Spectrum Solar Simulators
Authors: Gao Ling , Zhang Guo Yu , Jiao Yang , Liu Jing
Published: March 2012

It’s provided a selection of basis on Xe-lamp sources of output full spectrum of solar simulator by inducing light-emitting principle, spectral characteristics, power calculation and so on. than combined with the test result by spectrometer is presented evaluation method of spectroscopy. At last It summarized the methods of Xe-lamp source installation and accessories use.
Study on Effect of Gasket Stress Distribution on Bolted Flanged Connections
Authors: Liu Lin , Zhang Suo Long
Published: March 2012

The gasket stress distribution was analyzed by finite element method (FEM). The leakage of bolted flanged connections was predicted based on gasket stress distribution, and the results were investigated and compared with the experimental results. The effect of gasket stress distribution on connection leakage was studied. The results indicated that the flange rotate enlarged along with increasing of bolt load, and the inhomogeneity of gasket stress distribution improved, and then the difference value of average gasket stress and maximum gasket stress expanded. The maximum gasket stress located at the gasket outer periphery is found to be a key parameter that controls leakage.
Study on Mechanics Structural Synthesis of Six-Legged Walking Robot with Parallel Leg Mechanisms
Authors: Rong Yu , Jin Zhen Lin , Qu Meng Ke
Published: March 2012

In order to use the parallel leg mechanisms in the six-legged robot, a six-legged walking robot with parallel leg mechanisms was presented. A six-legged walking robot type synthesis method based on screw theory was proposed. By this method, the paper carried on the structural synthesis of whole robot and the parallel leg mechanisms. 2-UPS&UP mechanism was chosen as the leg mechanism of the six-legged walking robot. 2-UPS&UP mechanism had been proven not to be an instantaneous mechanism by the displacement manifold theory. The specific structure of the six-legged walking robot based on2-UPS&UP mechanism was designed. These studies laid the theoretical foundation for further study of the six-legged walking robot. This type synthesis method could be used for the design of other multi-legged walking robot.
Effect of Urea Content on Properties and Microstructure of Ni/TiO2 Group Particles ER Fluid
Authors: Tan Suo Kui , Song Xiao Ping , Zhao Hong , Ji Song , Guo Hong Yan , Sun Yu Hong
Published: March 2012

This paper emphasis have researched the effect of Ni/TiO2 group particles modifier with Urea by properties and microstructure，it has showed that ER activity of the particles were closely associated with urea content. When the mass ratio of urea/Ti is 30%, The microstructure observation of the ER fluids under DC electric field showed that the particles aggregated to form thicker and dense column structure when the mass ratio of Urea/Ti is 30%, while the column structure were broken when excessive urea (>30%) was added. A thin and loose column structure was formed in non-urea added ER fluid.
Electron Transport Properties of Rippled Zigzag Graphene Nanoribbon
Authors: Tao Zhi Kuo , Chen Jiang Wei , Wang Wei , Chen Li
Published: March 2012

In this paper, we present the calculated conductance of the rippled zigzag graphene nanoribbon and study the electron transport properties with different amplitude and period of the ripple. Based on the obtained results we find that, the conductance exhibits oscillation when the direction of the ripple is parallel to the direction of electronic flow and we ascribe it to the strain-induced modulated potential. For the second configure when the direction of the ripple is perpendicular to the direction of the electronic flow, we find that the conductance when energy varied around 0eV increases and then decreases with changing amplitude, for which the reason is still unknown.
Study on Preparation of Mg(OH)2 as New Flame-Resisting Materials from Dolomite through the Carbonization
Authors: Wang Yuan Rui , Liu Feng Juan , Qiang Guo Jun , Hu Jiang Lei
Published: March 2012

The optimal conditions of prepared magnesium hydroxide using dolomite as raw material were systematically explored by carbonization. The influence between the factors of reactions and the extraction rate of magnesium hydroxide was studied. The structure and composition of product were analyzed by Fourier transform infrared spectrometer, X ray diffraction and electron microscopy. In the conditions, the extraction rate could be up to 90.32%, and its crystal was a hexagonal-type. This method has many kinds of advantages, such as simple operation, low costs of production, eliminating the environmental pollution and comprehensive utilization of by-products.
The De-Gassing Evaluation with Full Penetration for Remote Laser Welding of Zinc Coated Sheet Metal
Authors: Tian Jian , Zhang Zhong Ning
Published: March 2012

There are the four types of defects during remote laser welding of zinc coated sheet metal. The root cause of all these defects is the explosion or ejection of molten weld metal caused by the escape of trapped high pressurized zinc vapor. Zinc removal is one of the methods used to solve the defects. We have researched the full penetration zinc removal method for remote laser welding with coupons of zinc coated sheet metal. The result shows that the full penetration zinc removal method works at the cost of high heat input and low welding speed
Experimental Researches on Composite Bentonite-Based Briquette Binder
Authors: Shu Ming Yong , Yin Hai Ying , Liu Guang Hui
Published: March 2012

Taking modified na-bentonite as matrix, PEG-20000 and NaHA are added to form composite briquette binder, while its influence on the properties of the prepared briquette is studied. The result indicates when the dosage of the composite briquette binder consisting of 0.8Kg Sodium bentonite, 0.08Kg PEG-20000 and 0.12Kg NaHA is 7% of the coal sample mass, briquette with relatively higher compressive strength, good thermal stability and desirable humidity resistance can be prepared.
Cr-Substituted Mesoporous Aluminophosphate Molecular Sieve: Preparation, Characterization and Catalytic Activity in the Oxidation Reaction of Ethylbenzene
Authors: Zhang Ji Shi , Wang Zhe , Xue Jing Wen , Li Xin Zhu
Published: March 2012

Cr-substituted mesoporous aluminophosphate molecular sieve (Cr-MAP) was prepared and characterized. Cr-MAP is a typical mesoporous molecular sieve with long-range ordered structure, providing effective molecular sieve for fabricating acetophenone by selectively oxizing ethylbenzene with tertiary butyl hydro peroxide (TBHP). When the reaction is at 100 °C for 8 h, using chlorobenzene as solvent and TBHP as oxidant, ethylbenzene conversion, acetophenone selectivity and acetophenone yield reach 72.8 %, 85.4 %, and 62.2 %, respectively.
Widely Tunable Fiber Ring Laser with Narrow Linewidth and Fine Tuning Resolution Based on Laser Materials
Authors: Su Yu , Ren Jian Hua , Zhao Tong Gang , Shen Shu Qun , Xu Zheng Shan , Liu Xiao Bo , Wu Wei
Published: March 2012

We experimentally demonstrate a tunable fiber ring laser with narrow linewidth and fine tuning resolution based on Er3+-doped fiber(EDF) laser material. A tunable fiber Bragg grating(FBG) filter is used in the system as the frequency selecting element, and a stepping motor together with a single chip acts as the precise tuning mechanism. The fiber ring laser has a narrow linewidth of ~0.07nm, a tuning resolution of ~1.5pm/pulse, an output power of ~25 mW, and a slope efficiency of ~17.9%.
Synthesis, Structures, and Luminescent Properties of a Yellow-Emitting Iridium Complex
Authors: Zhang Li Ying , Liu Xiu Ying
Published: March 2012

The synthesis, structure and luminescent properties of a cyclometalated iridium (ΙΙΙ) complex are reported. The cyclometalated ligand and auxiliary ligand are 2-(2-fluorophenyl)-benzothiazole (F-BT) and acetylacetone (Hacac), respectively. The complex (F-BT)2Ir(acac) exhibits bright photoluminescence (PL) at room temperature with a high solution PL quantum efficiency of 0.62. Organic electroluminescent (EL) devices are fabricated employing (F-BT)2Ir(acac) as an emissive dopant in 4,4′-N,N′-dicarbazole-biphenyl (CBP) host. EL efficiency shows weak dependence on doping concentration and current density. While the optimized device exhibits a peak efficiency of 28.5 cd/A and a maximum brightness of 49880 cd/m2. An efficiency of 22.7 cd/A at 100 mA/cm2, 80% of the maximum, can be achieved.
Synthesis of Magnetic-Fluorescent Liposome for Cancer Imaging
Authors: Chen Zhong Ping
Published: March 2012

Monodisperse iron oxide and quantum dots were synthesized via high-temperature decomposition. Hydrophobic iron oxide was transferred into water and then encapuslated into vesicle interior of liposomes with hydrophilic quantum dots within the phospholipid bilayer. The formed magnetic-fluorescent liposomes with embedded structure can be used for both magnetic resonance imaging and fluorescent imaging in biological field.
Experimental Study of the Mechanical Properties of the Composite Materials Hose
Authors: Wang Zhi , Liu Wen Wen , Du Yun Hai
Published: March 2012

The tensile elastic modulus, bend elastic modulus and tensile strength of the composite materials hose were determined by uniaxial tension test and three point bending test. The specimen was first destroyed from the inner or outer layer rubber, and then the spiraled cords threads was pulled out and the specimen destroyed with irregular fracture shape. According to the test results, the flexible hose can be considered as linear elastic material because the deformation showed a linear relationship with the external load in uniaxial tension test and three point bending test. The bend elastic modulus EB is much smaller than the tensile elastic modulus ET. The calculation results used EB show a good consistency with the test result and the EB should be selected as design parameters and the design system would be more secure.
Study on Durability of Silicone Rubber Sealant for Pavement Joint
Authors: Liu Jie Sheng , Li Dong Lai , Yu Jun , Zhang Zong Wang
Published: March 2012

The durability of sealing materials for road joint plays an important role in service of roads. The durability of silicone rubber sealant was studied by way of the testing its properties of liquid resistance, chemical resistance, alternate freezing and thawing stability and adhesion at various temperatures. The results evident that silicone rubbers have good thermal characteristics, chemical resistance, and environmental stability, which make this class of materials very attractive selection for use in the outdoor applications.
Addition of Nano-ZrO2 Effects on Microstructures and Properties of WC-8Co Hard Alloys
Authors: Sun Lan
Published: March 2012

This paper carries out the research on using the toughening mechanism of phase transition of ZrO2 to inhibit the WC grain and improve the toughness of the hard alloys. WC–ZrO2–8wt%Co hard metals was mixed with 0-2 wt% nano-ZrO2 and prepared by conventional sintering (CS) for 2 h at 1440oC to see whether the addition of ZrO2 could improve densification behavior, the microstructure and mechanical properties of the samples. Experimental results showed that the use of ZrO2 nanoparticles could decrease the relative density because of the worse wetting effects; it could also inhibit the growth of the grains of WC-Co hardmetal to enhance the hardness of the alloy. The fracture toughness of sample has an increasing tendency as a whole because of the phase transition during the sintering process.
Preparation and Synthesis of Functional Silica-Nafion Composite Materials
Authors: Zhi Yu Yuan , Gu Kai , Lian Hui Qin , Cui Xiu Guo
Published: March 2012

In this study, a series of sulfonic-functionalized mesoporous silica (SMS) were synthesized and SMS-Nafion composites membranes were fabricated. The morphology of SMS was characterized by scanning electron microscopy and BET. The physical properties of SMS and composites membranes were tested in terms of ion-exchange capacity, linear expansion, and ionic conductivity. The results showed that the morphology of SMS influenced their physical properties as well as the properties of SMS-Nafion composite membranes.
Orthogonal Experiment of Wave Absorption Property for Three-Layer Absorbing Structure Composite Material Plates
Authors: Deng Jing Lan , Feng Bing
Published: March 2012

Three-layer Absorbing Structure Composite Material Was Designed According to Impedance-matching and Attenuation Principles. in this Construction the Surface Layer Contained MnO2, the Intermediate Layer Fe(CO)5 , and the Bottom Layer Graphite. the Effects on the Wave Absorbing Properties of Varying the Absorbing Agent Content in each Layer of Three-layer Plates Were Investigated by Orthogonal Experiment. the Results Showed the Optimal Composition of Absorption Peaks Occurred with a Content of MnO2 in the Surface Layer of 30Wt%, a Content of Fe(CO)5 in the Intermediate Layer of 20Wt%, and a Content of Graphite in the Bottom Layer of 40Wt%. this Combination Produced a Peak Absorption of -29.05 Db. the Optimal Composition for Wider Bandwidth Occurred with a Content of MnO5 in the Surface of 10Wt%, a Content of Fe(CO)5 in the Intermediate Layer of 20Wt%, and a Content of Graphite in the Bottom Layer of 40Wt%. Further in-depth Study Will Research Optimization of both Factors to Gain Greater Absorption Peaks and Wider Bandwidth. the Findings of this Research Will Have Value in Engineering Applications of Functional Composite Materials.
Structural Analysis for an Ultra-Precision Machine Slide by FEM Based on Applied Mechanics
Authors: Gao Bin , Zhu Jing Hua , Lang Wen Chang
Published: March 2012

Micro/nano machining becomes more and more important and popular. Ultra-precision machines are the fundamentals. Aiming at design and developing an ultra-precision machine tool for micro/nano machining, the slide, one of the most important part of the machine has been analyzed by FEM. The software Abaqus has been used for the analysis. Based on the full load created by the coils and permanent magnet of the linear motors, the kinetics characteristics have been analyzed. According to the analytical results, the slide structure has been optimized to fulfill the requirements of the developed micro/nano machine tool.
Crack Security Influence on Refractory Design with Thermo-Mechanical Stress
Authors: Kong Song Tao , Cai Ping , Zhang Mei Jie , Zhao Li Jun
Published: March 2012

The fracture growth is one of primary causes which the refractory of ladle destroys. We have carried on the computation and the analysis to the ladle temperature field and the stress field coupling by he finite-element method. Attributes the crack state-of-art stress strain field using the J-integral, has established in the ladle refractory in the thermal load and under the molten steel load function its crack secure relations, and obtained the crack security change rule. These results have provided the support rationale to the equipment safe operation.
Dynamic Research of Construction Safety with Building Materials
Authors: Jia Lu , Fu Fei Fei
Published: March 2012

Safety regulation is an important approach to secure the constructing process. A three-player regulation evolutionary game model is built, the stability analysis and simulation results show that evolutionary equilibrium (EE) does not exist, providing a convenient way for regulation policy making.