bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis, Spectral Properties of Methyl-2-Pyridyl Ketone Benzoyl Hydrazone and its Complexes with Rare Earth Nitrates
Authors: Tai Xi Shi , Wang Lin Tong
Published: March 2011

A new schiffbase ligand, methyl-2-pyridyl ketone benzoyl hydrazone (L), and its complexes with rare earth nitrates have been synthesized. These new complexes with the general formula of Ln(L)2(NO3)3·nH2O(where Ln = La, n = 5.5; Ce, Pr, n = 5; Nd, Eu, n = 4 ) were characterized by mass spectra, elemental analysis, IR spectra, thermal analysis, UV spectra, molar conductivity and luminescent spectra. All the complexes are stable in air. The results show that the lanthanide ion in each complex are coordinated by oxygen and nitrogen atoms of the ligand, the oxygen atoms of the nitrate and coordinated water molecules. The amide-oxygen atoms of L coordinate to the Ln ions in its keto-form. Tentative structures for the complexes have been proposed.
Synthesis, Fluorescence Properties of 2-Acetyl-2'-Chloroacetanilide with Rare Earth Nitrates Complexes
Authors: Tai Xi Shi , Wang Lin Tong
Published: March 2011

The reaction of 2-acetyl-2'-chloroacetanilide (L) with rare earth nitrates in CH3CH2OH followed by recrystallization in CH3CH2OH gave rise to colorless block crystals materials. The complexes and ligand were analyzed by FAB, elemental analysis(C, H, N), FT-IR spectra, TG-DTA, molar conductivity and X-ray single crystal diffraction. The fluorescence properties of ligand and the Eu (Ⅲ) complex also have been investigated. The results of crystal structure and spectral data show that the rare earth ions coordinated with oxygen and nitrogen atoms of the ligand, the nitrate and coordinated water molecules. The Eu (Ⅲ) complex material shows characteristic red emissions.
Blower Resource Scheduling Based on Elite Genetic Algorithm
Authors: Yang Guang Nian , Qi Wei , Zhou Jun
Published: March 2011

Now, our sewage treatment industry mainly depends on the blower of aeration act as metabolic, absorbed in the toxic substances. Blower resources management is the key issue of sewage treatment. Traditional resource scheduling algorithm exist some defects, for example it can not well meet the quality requirements and can not get the optimal solution. This article gives a new resource scheduling method based on improved genetic algorithm. It achieves grid resource scheduling by using real number encoding and activities point crossover. Experiments show that genetic algorithm can reduce executing time and task completion time, and further improve the scalability of resource scheduling model. This algorithm has stability and high efficiency in grid environment.
Automatic Demultiplexing Method for NRZ-OOK and RZ-OOK Polarization-Division Multiplexed System
Authors: Jing Qi , Huang Yong Qing , Zhang Yan Gan , Yuan Xue Guang , Li Ping
Published: March 2011

We propose a new automatic optical polarization demultiplexing method for NRZ-OOK and RZ-OOK polarization division multiplexed (PDM) system. The detected power differences of the radio frequency (RF) at low frequency are used as control signals which are sensitive to the angles between the states of polarization (SOP) of the polarization controller (PC) and the polarization beam splitter (PBS) at the demultiplexing side. The characteristics of the detected RF signals of NRZ-OOK and RZ-OOK are compared, and the best RF detection windows are calculated out through system simulation.
Research of CANopen Slave Node Based on Embedded System
Authors: Chen Zai Ping , Wang Feng , Jia Chao
Published: March 2011

As a typical application layer protocol of CAN-bus, CANopen has been widely accepted in many fields. In this paper, CanFestival, which is a kind of open-source CANopen stack, is briefly introduced. The implementation scheme of CANopen slave node is proposed, which is based on a kind of AVR microcontroller-AT90CAN128 and open-source CANopen stack-CanFestival. In this paper the hardware design of slave node and the open-source protocol stack transplant have completed successfully. The debugging experiment of this slave node communication has been carried out, and the correctness of the scheme of hardware design and software transplant is verified by debugging experiment results in this paper.
The Building of Offshore Facilities Power System’s Equivalent Circuit Model
Authors: Zhang Hong , Ma Xu Hui , Yin Xiu Ye
Published: March 2011

With the development of technology, the power system of offshore facilities (for short: power system) is increasingly complex, short-circuit current calculation process also becomes more complex. The simple recursive algorithm can not meet the requirements of short-circuit current calculation in complex power system. The paper, basing on the principle of short-circuit current calculation, taking modeling ideas, created an equivalent circuit model of power system for short-circuit current calculation. The equivalent circuit model can be used to simplify the progress of calculation and meet the needs of the power system development.
Experimental Study on the Shear Strength Characteristics of Municipal Solid Waste
Authors: Zhang Zhen Ying , Wu Da Zhi
Published: March 2011

Basing on the traditional tri-axial test instrument with large scale specimen, the shear strength characteristics of municipal solid waste has been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. Two different proportions of these three parts, which are 50%, 15%, 35% and 65%, 10%, 25% is selected. A series of laboratory tests have been performed for different proportion of ingredients, different initial void ratios and different confining pressures. Testing results show that the initial void ratio and the proportion of ingredients are the main influence factor for the shear strength of the municipal solid waste. Besides, the principle effective stress increases with the axial strain and the confining pressure in a hardening increasing trend, and the principle effective stress decreases with the increase of the initial void ratio of the municipal solid waste.
An Automatic Mesh Generator for Hexahedral Element Mesh Using an Improved Grid-Based Method
Authors: Sun Lu , Zhao Guo Qun
Published: March 2011

An automatic mesh generator AUTOMESH-3D is developed by the authors in this paper. The generator can adaptively produce hexahedral element meshes with an improved inside-out grid-based method. This method involves seven steps: STL model construction, geometric feature identification, cubic grid structure generation, jagged core mesh generation, surface-gap filling, boundary matching and quality improvement. Adaptive refinement, local refinement and boundary matching techniques are employed to generate eligible elements according to the model’s features and users’ requirements. Several examples of hexahedral element mesh generation with AUTOMESH-3D are given, and the effectiveness and robustness of the mesh generator are demonstrated.
Study on the Needle Loom Condition Monitoring System Based on Working Condition Parameters
Authors: Deng Hui , Li Zhang
Published: March 2011

Nowadays, the condition monitoring and intelligent fault diagnosis methods research of the needling loom in our country is still a blank. How to establish the appropriate monitoring methods under different working conditions becomes an important issue. In this article, some methods in terms of the open system construction proposed to work out the problems above, which is the Needle Loom condition monitoring system based on working condition parameters. This system take full advantage of the rapid development of hardware and software technology, providing online or offline information to remote monitoring terminals for different processing conditions, enriching remote monitoring data sources, integrated with realizing the needle loom field condition monitoring and the physical state online detections.
The Design of Vibration-Resistance for Air Compressor House in Colliery
Authors: Cao Lian Min , Zeng Qing Liang , Xiao Xing Yuan
Published: March 2011

The paper mainly analyses the vibration of air compressor house in colliery, chooses the reasonable vibration-resistance measures and solving schemes and realizes the design aim in phase. It ensures the nicety of decreasing vibration instrument, damped vibration instrument, the efficiency of vibration-resistance over 80% and vibration speed less than 12mm/s, which reduces the effect of vibration for the surroundings.
Hardware Design with Mechatronics Method for Real-Time PCRs
Authors: Zhang Nan , Wang Jin He
Published: March 2011

This paper describes hardware design with mechatronics method for gene PCR Probes and analyzes its sub-channels. The temperature sensor is mounted in each sub-channel, and the signals from sensors pass through amplifiers, voltage adjusting circuits and inversing proportion circuits into converter. The heater channels consist of six thermoelectric heat pumps. For each channel, the two heat pumps which contain 71 thermocouples are connected in PCR series. The approach focuses on the use of sensors and actuators to improve the precise of complicated real-time control system. The experimental results show that the resultant curve of the performance of the heat pumps appears as an inverted parabola.
The Research with Advanced Oxidation Technology to Degrade Organic Matter in Micro-Polluted Water
Authors: Zhao Xia , Luo He Ming , Feng Hui Xia , Zhang Jian Qiang
Published: March 2011

Potassium permanganate process is an advanced oxidation technique that can provide a resolution removing organic matter in contaminated water. In this paper, the combination of composite potassium permanganate and a certain coagulant used in this process, which it was particularly suited to rapidly oxidize and degrade pollutants. It was an effective enhanced coagulation, advanced oxidation technique that could be conducted in a normal micro-polluted water environment. A series of experiment results demonstrated that the best adding quantity of composite potassium permanganate was 1.5-3.0mg/l, the best adding quantity of PFS as the coagulant was 25mg/l. Under the above conditions, potassium permanganate oxidation obviously reduced to each pollution index and greatly improved the water quality of purification of micro-polluted water. Furthermore, the organic removal rate with composite potassium permanganate was more than the unitary potassium permanganate process and the current traditional process.
Government Emergency Procurement System Based on Integrated Theory
Authors: Liu Jun , Dong Qian Li
Published: March 2011

Natural disasters and public health emergencies occurred frequently and nearly everywhere in recent years. The emergencies not only seriously affected the production and life of people in disaster areas, but also brought huge economic losses to the state. In order to minimize these losses, the government must establish emergency procurement system to ensure providing necessary materials after emergencies in the fastest speed, best quality and lowest cost for the affected areas. Based on this, this paper, using integration theory, recognizes the government emergency procurement platform system, operating system and supervision system as the elements of the government emergency procurement system, and laid the foundation for further study.
Research on Customer Equity Measurement of Commercial Website
Authors: Shao Jing Bo , Chen Ke Ke
Published: March 2011

Owing to the distinctiveness of business operation mode and profit acquisition style between commercial website and entity enterprise, traditional customer equity measurement model is not applicable to that of commercial website.Therefore,this paper combines the basic theory of customer equity with the features of commercial website and puts forward customer equity measurement of commercial website on the basis of ARIMA time series model,then further choose Sohu company as a case and calculate its customer equity value. Study results show that this model is not only accurate but highly feasible.
Finite-Time Control of Fuzzy Continuous-Time Systems with Exogenous Disturbance
Authors: Liu Cai Xia , Zhang Ying Qi
Published: March 2011

In the paper, new results on finite-time control of fuzzy continuous nonlinear systems subject to exogenous disturbance are presented. Applying the Lyapunov function theory, some sufficient conditions including relaxed ones are established for finite-time stability by fuzzy controller laws.
Adsorption Performance of Compound Adsorbent Using the Thermal Vacuum Method
Authors: Zhao Hui Zhong , Sun Xiao Cui , Liang Hai Bin , Yan Kun
Published: March 2011

The thermal vacuum method was used to test the adsorption performance of compound adsorbent. This thermal vacuum method, without vacuum pump, can expel the air of system up to its partial pressure, lower than 2 Pa. the adsorption performance of 13X zeolite and some compound adsorbent were tested by this way. Conclusions can be drawn as following: the adsorption capacity of 13X measured by this way has the less difference (<10%) with the reference. In this experimental system, the compound adsorbent, which has better adsorption performance and mould performance, was used in a solar cooling tube system as adsorbent and the experimental coefficient of performance (COP) of the solar cooling tube can reach about 0.26.
Web Recommendation Based on Unified Collaborative Filtering
Authors: Zhong Jiang , Cheng Yi Feng , Deng Shi Tao
Published: March 2011

Web usage mining technique is widely used for Web recommendation, which customizes Web content to user-preferred style. Traditional techniques of Web usage mining can only discover usage pattern explicitly. In order to employ the users’ feature and web pages’ attributes to get more accuracy recommendation, we propose a unified collaborative filtering model for web recommendation which combined the latent and external features of users and web page through back propagation neural networks. In the algorithm, we employ Probabilistic Latent Semantic Analysis (PLSA) method to get latent features. The main advantages of this technique over standard memory-based methods are the higher accuracy, constant time prediction, and an explicit and compact model representation. The preliminary experimental evaluation shows that substantial improvements in accuracy over existing methods can be obtained.
Impulsive and Diffusive Effects on Stability of BAM Neural Networks with Delays
Authors: Zhou Qing Hua , Wan Li
Published: March 2011

Although the results on exponential stability of delayed bidirectional associative memory (BAM) neural networks with impulse or diffusion were reported by some researchers, impulsive and diffusive effects should simultaneously be taken account into consideration since diffusion and impulses are ubiquitous in both nature and manmade systems, which reflects a more realistic dynamics than the former results. By using the impulsive delay differential inequality, some new sufficient criteria on exponential stability are established. Our criteria are independent of diffusion effects and dependent on the magnitude of the delays and impulses, which shows that diffusion effects are harmless and the magnitude of the delays and impulses needs enough small in the stabilization.
Mining Model of Fuzzy Association Rules and its Application in Calciner
Authors: Wang Jie , Dang Qin Hua , Wu Zhen Jie
Published: March 2011

The fuzzy clustering method is used to divide the data of calciner in this paper, and the method of fuzzy association rules is applied to get the control rules of calciner. Firstly, the fuzzy cluster and association algorithm are discussed,, later the hybrid algorithm KFCM is utilized to calculate the real data from the calciner to get the membership of each data, and MFAR method is used to obtain effective fuzzy association rules. The way put forward in this paper can solve the bottlenecks of expert experience, and can provide theoretical basis for the control of calciner.
A Comparison of Psychoacoustical Evaluation Methods for Vehicle Engine Noises Based on Wavelet Shrinkage Denoising Technique
Authors: Wang Yan Song , Yan Yue , Qiu Zhi , Zhang Jin
Published: March 2011

Based on the measured and denoised vehicle engine noises, the sound quality evaluation (SQE) techniques in common use for A-weighting sound pressure level (SPL) and psychoacoustical parameters, such as loudness, sharpness and roughness, are performed and compared in this paper. The wavelet threshold shrinkage method is adopted for sound signal denoising. The comparisons suggest that the A-weighting SPL is not sufficient and can only be used as a reference in vehicle SQE, the psychoacoustical parameters can provide a complete description and more exactly reflect to the subjective feeling of vehicle noises, should be considered in vehicle designs.
An Application of FSA Methodology to the Safety of Bulk Chemical Tankers
Authors: Yu Bin , Jin Yong Xing , Zheng Bin , Zhang Xiao Dong
Published: March 2011

Based on detailed analysis of the risk of bulk chemical tanker transportation, a societal risk acceptance criterion is established. The criterion takes advantage of formal safety assessment (FSA) methodology, which is widely used to analyze risk in maritime industry. In the end of this paper, the negligible range, the ALARP range and the intolerable range of bulk chemical tanker in China are estimated in the criterion.
Fuzzy Logic Control of Photovoltaic Lead-Acid Charging System
Authors: Yarn Kao Feng , Wu King Kung , Chung Long Yeu
Published: March 2011

A new photovoltaic solar cell charging system with fuzzy logic control is proposed and designed. This kind of solar energy storage system is composed of a solar cell, a charger, batteries, a buck converter and a digital signal processor. It mainly applies a low-voltage level translator to control the pulse charging current of a lead-acid battery and also combines the fuzzy control method to improve the charging efficiency, suppress the abnormal temperature rise in the battery, lengthen the battery life-time, reduce the additional waste, etc..Experimental and simulated results are shown to demonstrate and compare the validity of the system and verify the effectiveness with each other.
Distance Vector Based Sequential Spectrum Sensing Scheme for Cognitive Radio Networks
Authors: Wang Li Na
Published: March 2011

In this paper, we investigated the problem of spectrum sensing to identify primary users in cognitive radio networks. And then we proposed a sequential spectrum sensing scheme based on distance vector. A reliable factor was introduced into the sequential spectrum sensing scheme. This factor was related to distance and could determine the reliability of individual local decision. Simulation results show that the proposed spectrum sensing scheme can provide better performance, and the probability of sensing error can be reduced to 3% compared to the SPRT scheme.
Design and Realization of NAND Flash Based on Embedded Linux System
Authors: Yin Zhi Jian , He Yun Fei , Xiong Chun Ru , Zhong Run Yang
Published: March 2011

This paper utilizes ARM 9 series chips such as S3C2440 as the CPU to realize an embedded Linux system. Due to the integration of NAND Flash in S3C2440, it is easy to connect the NAND Flash external devices in the perspective of hardware. After that, the system combines the serial ports which intend to load and debug the driver of NAND Flash, realizing the loading and uninstalling of NAND Flash storage modules. The innovative design and realization is a basic for the implementation of YAFFS file system in the Linux terminals.
Web Fuzzy Clustering Processing Model
Authors: Xie Kai Xi , Chen Ting Gui
Published: March 2011

In this paper, we combine the web mining and fuzzy clustering and give the concept of web fuzzy clustering processing model and its application. We also introduce the web fuzzy direct clustering method in brief. Web fuzzy clustering can be used in the web user clustering and web page clustering of web usage mining.
The Stripping Principle to the System Synthesis for a Kind of Complex Networked Systems
Authors: Wang Wei
Published: March 2011

In this paper, based on the philosophical thinking of `On Contradiction', we propose a method to the system synthesis for a kind of uncertain networked systems which are composed of some heteromorphic subsystems. We call it the stripping principle. Based on the principle, we design, for each node, the integral feedback with variable gain so that it can remove or eliminate the interconnected parts, uncertainties and disturbances. Then we translate the problem of networked control into that of decentralized control. So we need only to consider the synthesis for each of the subsystems respectively without concerning the influence of the non-principal factors. Therefore, with little restrictions to the networked system and using simple control structure, we can get satisfactory control results even for systems which are with non-smooth components. The theoretical analysis and simulation results are shown to indicate the effectiveness of the proposed method.
Study on the Parametric Optimal Design of a Different-Speed Mixer
Authors: Fan Zhi Min , Hu Wei Fei , Choi Dong Hoon , Xu Jun
Published: March 2011

The mechanical analysis and parametric optimal design of a different speed mixer is presented in this paper. After mechanics analysis, the total transmission power is derived. According to the realistic design requirements, several design constrains are also described. After established the whole optimization mathematical model of the different-speed mixer, Sequential Two-point Diagonal Quadratic Approximate Optimization (STDQAO) algorithms is applied for the optimal design of the mixer, and obtained the minimum transmission power.
Influence of Hydrogen Dilution on Electrical Properties of Amorphous Silicon Thin Films Deposited on Glass Substrates
Authors: Li Ying Ge , Du Dong Xing
Published: March 2011

Thin film Amorphous Silicon materials have found wide application in photovoltaic industry. In this paper, thin layers (around 300nm) of intrinsic hydrogenated amorphous silicon (a-Si:H) are fabricated on glass (Corning Eagle2000TM) substrates by employing plasma enhanced chemical vapor deposition (PECVD) system with gas sources of silane and hydrogen. The deposited thin films are proven to be material of amorphous silicon by Raman spectroscopy measurement and their electronic transport properties are thoroughly characterized in terms of photoconductivity, dark conductivity and photo response. The effect of Hydrogen dilution on electrical properties are investigated for a-Si:H thin films deposited in the temperatures range of 150~200°C. Results indicate that a-Si:H thin films on glass substrate owns device-quality electrical properties and could be applied on fabricating thin film solar cells as the absorber layer material and on other photovoltaic or photo electronic devices.
Factors Influencing Diameter of Polypropylene Fiber in Melt Electrospinning
Authors: Hao Ming Feng , Liu Yong , He Xue Tao , Ding Yu Mei , Yang Wei Min
Published: March 2011

Melt electrospinning is a safer, more environmentally friendly and cheaper alternative to solution electrospinning in producing superfine fibers. In this paper, a novel melt electrospinning device was used, which has higher efficiency than conventional equipment. Polypropylene is widely used in many fields and it is difficult to find a suitable solvent for its solution electrospinning at room temperature, so it was chosen in this study. The influences of the electrospinning parameters such as temperature and voltage on the diameter of the spinning fibers have been studied. Temperatures higher than normal processing temperatures were used in present electrospinning system in order to reduce the viscosity of the polymer melt sufficiently. Good quality fibers with smooth surfaces and with diameters mostly smaller than 10 microns were spun successfully. It was found that there was an optimum point for the spinning voltage (70-80KV) and the temperature (230-260°C) to get fine fibers.
A New Process for Manufacturing Straw Particleboard by Impregnating and Enzyme Treatment
Authors: Qi Chao , Wang Wei Hong , Li Wen Jing
Published: March 2011

However, the wheat straw surface was difficult to be penetrated by adhesive due to the wax layer existed on its surface. It is a key point that how to manufacture straw particleboard with traditional resin. This paper explored a novel method to solve this problem by pre-treating straw particles with enzyme and impregnating with resin. Different from conventional spray application, straw was impregnated with phenolic resin (PF). Part of these straws was pretreated with xylanase and lipase before impreanating to improve the bonding between adhesive and straw. The results indicated that when straw was pretreated with lipase and and then applied 10% PF by impregnating, the properties of wheat straw particleboard were optimal, bending strength was 13.81 MPa, elastic modulus was 2.67GPa, internal bond strength was 0.113MPa and 2h thickness swelling was 16.74%.
Effect of Spinning Conditions on the Morphology of Polyacrylonitrile Hollow Fiber Membranes
Authors: Zhang Xiao Guang , Li Jing , Miao Zhan Li
Published: March 2011

In this paper dry-wet spinning technique was used during the preparation of dialysis hollow fiber membranes, three-component solution polyacrylonitrile(PAN)/dimethylformamide (DMF)/Water was chosen as the basic materials. The macro and micro-morphology of the hollow fibers were observed by microscopy and SEM. The influence of some important spinning parameters such as spinning pressure, inner pressure and spinneret aperture was investigated. The appearance of some big bores in the outer surface and multilayer structure in the cross section of the hollow fibers was discussed based on phase transition theory. The results show that the spinneret dimension is the key factor that determines the macrostructure of the membrane, the bigger the spinneret aperture the bigger the fiber size; the inner, outer membrane diameters and wall thickness increase with the spinning pressure; the inner, outer membrane diameters increase and the wall thickness decreases with the inner pressure; Concentric spinneret with proper aperture must be used to obtain satisfactory fibers.
Springback Prediction of the TRIP Sheet Steel Stamping
Authors: Shan Ti Kun , Liu Li
Published: March 2011

An enhanced elastic-plastic constitutive equation taking into account strain induced transformation is developed. The variation of the Young’s modulus with the martensitic transformation during stamping process is also introduced to improve the accuracy of springback simulation for TRIP steel. The accuracy of the proposed method is verified by comparing with the conventional FE model and experimental results. The enhanced material model is testified to be efficient in accurate prediction on springback for TRIP steels, which will put forward the application of TRIP steel sheet in auto body manufacturing.
Finite Element Analysis of Performance for Radial Tires, Part I: Model, Material Constants
Authors: Liu Yong , He Xue Tao , Yan Hua , Guan Chang Feng , Yang Wei Min
Published: March 2011

As an economical, resultful and direct method, finite element method has been used broadly to simulate tire performance. However, much of the published research shows few detail model or no material constants. It is difficult for readers to judge if the result is reliable. To ensure simulation results are credible, the material constants, simulation model and analysis method must be dependable. In the current work, the three-dimensional radial tire models, finite element models of free and ground-touching tires, were built and showed in detail. The material constants measured from experiments in a tire factory were published. Using the well-known finite element simulation software ANSYS, the current research found some interesting results which will be presented in Part II.
Analysis of Ring-Opening Reaction between Bisphenol A and Epichlorohydrin by the Method of Quantum Chemical Calculating
Authors: Li Jian , Yu Xun Zhang , Zhang Kai
Published: March 2011

The ring-opening reaction between bisphenol A and epichlorohydrin was calculated by Gaussian03. The Density Function Theory (DFT) method were employed to study the geometry structures of bisphenol A and epichlorohydrin and the product was obtained on the base of B3LYP/6-31G+ model in this paper. The transitional states (Ts1, Ts2) during the ring-opening process were found by TS method and the energy changing of the system was proved by IRC calculation. Results showed that the energy reduced by 64.37726kJ/mol during the ring-opening process. The product was confirmed to be thermodynamically stable.
Electronic Transport Properties of Hydrogenated Amorphous Silicon Thin Films Deposited on Plastic Substrates
Authors: Li Ying Ge , Du Dong Xing
Published: March 2011

Aiming for potential application in flexible solar cells, electronic transport properties are studied for hydrogenated amorphous silicon thin films on plastic substrates. Intrinsic hydrogenated amorphous silicon layers are deposited on Kapton and Upilex-s polyimide substrates at temperatures of 100°C and 180°C by plasma enhanced chemical vapor deposition (PECVD) system. Layers on 75μm and 125 thick Kapton and on 125 Upilex-s substrates are characterized by dark conductivity and activation energy measurements. It can be concluded that the intrinsic layer on 125μm thick Kapton and Upilex-s plastic both have favorable electrical properties and therefore could be employed as substrate material for flexible solar cells.
Experimental Study on Pseudo-Plastic Behavior for Film Foam Flow in a Vertical Tube
Authors: Du Dong Xing , Li Ying Ge , Sun Shi Jiao
Published: March 2011

Foam has been widely used as a mobility control agent for improved oil recovery, gas blocking and acid diversion during matrix stimulation in petroleum industry. For understanding foam rheology in porous media, this paper reports an experimental study on film foam flow characteristics in a vertical straight tube. Foam is treated as pseudo-plastic fluid and its non-Newtonian behavior is investigated based on power law constitutive model. It is observed the film foam flow shows clear shear-thinning behavior, with flow consistency coefficient of K=0.11 and flow behavior index of n=0.62. The apparent viscosity of flowing film foam is under the shear rate of 50s-1, which is 25 times higher than the single phase water.
Prediction of Forming Limit of Sheet Metal Based on Stören-Rice Model
Authors: Guo Wei Gang , Chen Jia Ming , Li Hui Min , Shao Li Dong
Published: March 2011

On the basis of Storen-Rice model, the limit strain formula is derived by introducing the plasticity constitutive relation coupling Logan-Hosford yield function. Limit strain of AL6111-T4 and AL2028 is calculated and compared with experimental data. The effect of index a of yield function, anisotropy parameter r on the calculation result is discussed. Index a has a significant effect on the right hand side(RHS) limit strain, while it has less relation with left hand side(LHS) limit strain. The RHS limit strain is smaller while a-value gets larger. Good correlation between the calculation result and experimental data is indicated when a-value equals to 4. The RHS limit strain is smaller while r gets larger when a equals to 2, while it has less relation with r when a equals to 4 or 6.
Preparation of Polyethersulfone Ultrafiltration Tubular Membranes with Superior Properties
Authors: Liu Jun , Liu En Hua
Published: March 2011

A novel polyethersulfone (PES) tubular membrane preparation by phase inversion via immersion precipitation using N,N-dimethylacetamide (DMAc) as the solvent, PEG-400 as the additive. The effects of membrane preparation conditioans on membrane performance were investigated. It was found that the flux was increased by adding ethanol into the coagulation bath. And the low temperature of coagulation bath also improve membrane’s rejection. Test results show that the flux can be up to 160 L•m-2h-1 and the rejection can reach more than 97% (for ovalbvmin) under optimized conditions.
Sealing-Spinning Technology for Thin-Walled Aluminum Alloy Tubes
Authors: Sun Li Xia , Jia Jian Bo , Xu Yan , Jiang Sheng Yuan
Published: March 2011

Thin-walled aluminum alloy tubes can be used as rigid sampling tubes in aerospace and geological exploration and other scientific researches. In order to ensure the scientific value of samples and isolate the external environment, two sealing ends of the rigid sampling tubes are required. In this paper, the sealing-spinning process is adopted to form two sealing ends of the thin-walled aluminum alloy tubes. The results show that rigid sampling tubes with good sealing quality can be formed by controlling the main technical parameters of sealing-spinning process. And the relationships between spinning load and feed rate of roller, spinning load and shape of roller, reducing ratio of wall thickness and feed rate of roller are found.
Study on the Preparation and Properties of Thermoplastic Tapioca Starch / Magnesium Hydroxide Composites
Authors: Mo Xian Zhong , Zhong Yu Xiang , Qi Xiang , Mo Chen
Published: March 2011

Thermoplastic tapioca starch(TPS) was prepared with the mixed plasticizer, formamide and urea (mass ratio 2:1). The introduction of magnesium hydroxide(MH) in TPS could rapidly increase processing torque on a high level(40~60Nm) at 130°C. Studies in the dependence of mechanical properties of thermoplastic tapioca starch/magnesium hydroxide composites(MHTPS) on the MH content from 0 to 20phr, the initial tensile strength and elastic modulus were increased up to the maximum 3247 MPa and 48.5 MPa at 20phr MH content respectively, while the elongation at break was reduced from 72% to 2.5%. TG mass loss curves showed that thermal stability of this composites had great improved under 500°C. The limited oxygen index(LOI) of MHTPS reached to 31% while the content of Mg(OH)2 was 20phr, and then the result of vertical flame testing achieved UL94 V-0 level.
Preparation and Characterization of Polyacrylonitrile-Metal-O-MMT Nanocomposites
Authors: Feng Hui Xia , Fu Gong Wei , Wang Yi , Chen Na Li , Yang Rui Chen
Published: March 2011

Polyacrylonitrile-metal-O-montmorillonite nanocomposites were prepared by means of in situ polymerization. The Na-montmorillonite was modified by quaternary ammonium salt after the exchange of its interlayer cations with Ni2+. Infrared spectra and X-ray powder diffraction were employed to characterize the obtained polyacrylonitrile-metal-O-montmorillonite. The results of FTIR show that metal-O-montmorillonite has been concerned with the polymerization of PAN. The result of X-ray powder diffraction shows that the inserting of the acrylonitrile monomer can enlarge the interlayer space of montmorillonite. It is also shown that the polyacrylonitrile-metal-O- montmorillonite nanocomposites have been synthesized. The thermal stability of PAN /MMT is better than that of pure PAN.
Experimental Study of Screw Speed Effects on Quality of Short Fiber-Rubber Composite Material
Authors: Wang Chuan Sheng , Zhang De Wei , Bian Hui Guang , Wang Xiao Bo , Guo Lei
Published: March 2011

During the extruding process of short fiber-rubber composite material, screw speed is an important factor which influences the orientation of short fibers, as well as the physical and mechanical properties of short fiber-rubber composite material. The effects of different screw speeds on physical and mechanical properties of short fiber-rubber composite material have been studied by experimental study. In the experiments, the screw speeds were 10rpm, 15rpm, 20rpm, 25rpm and 30rpm respectively. The experimental results indicated that when the screw speed was 15rpm, the physical and mechanical properties of short fiber-rubber composite material are better.
Influence of Transesterification on the Properties of PET/MAPE Blends Prepared by Reactive Extrusion
Authors: Gong Li , Wang Qing Wen , Song Yong Ming , Wang Hai Gang , Sui Shu Juan , Cui Yong Zhi
Published: March 2011

Blends based on maleic anhydride grafted polyethylene (MAPE) and poly(ethylene terephthalate)(PET) were prepared through reactive extrusion in the presence of titanium tetrabutoxide (Ti(OBu)4) as transesterification catalyst. Mechanical properties of PET/MAPE blends(70wt./30wt.) were evaluated by mechanical tests. The Effects of Ti(OBu)4 on the structure and melt crystallization behavior of the blends were investigated by Fourier transform infrared spectroscopy(FTIR), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The addition of Ti(OBu)4 to the blends could improve the compatibility between PET and MAPE as was evidenced by the SEM micrograph in which filaments connected to a network structure was observed. With increasing the contents of Ti(OBu)4, the impact strength of the blends increased obviously, the flexural strength and tensile strength of blends did not change significantly, while the degradation of PET was gradually significant as was evidenced by FTIR analysis. Small amount of Ti(OBu)4 could hinder the crystallization of PET and make its melt peak shifted to higher temperature.
CAE Optimization of Hot Runner Sequential Injection Molding for Car Interior Trim Panels
Authors: Yang Lu Lu , Zhang Hui Min , Li Meng
Published: March 2011

In the injection molding of large and thin plastics parts, multiple gates are used, so many weld lines would generate because melted plastic has more than two directions of flow. The existence of weld 1ine harms not only appearance, but also the mechanical properties of products. The paper studied the method of sequential injection to solve this problem. Taking car door trim panels for example, the flow simulations were done by Moldflow software. Conventional hot runner injection and sequential hot runner injection, different gating locations were compared. Optimization result was got. It was proven that sequential injection system can improve the quality of the surface (especially the weld 1ine) and the performance of the actual products thereby this can be guiding significance for the practical production.
Experimental Study on the Blending of EPDM/R-EPDM
Authors: Wang Chuan Sheng , Su Hui Hui , Meng Guang Zhen
Published: March 2011

The mechanical properties of EPDM/R-EPDM blending was investigated. Effect of the blending ratio, amount of DCP and silica and the curing temperature of EPDM/R-EPDM blend was discussed respectively. The results showed that each factor of the formulation has an optimum value or range. Part of EPDM can completely replaced by R-EPDM, and the mechanical properties can meet the product requirements.
Research of Polymerization Reactor Fault Diagnosis Based on Acoustic Emission
Authors: Huang Yi Hu , Wang Jin Li , Jiang Hui Qiong , Jia Xi Mei , Chong Hong Lei , Hu Man , Yang Wei
Published: March 2011

With the development and improvement of polymer processing technology, safety production requires higher and higher levels of reactor fault diagnosis and assessment. In this paper, a new method is put forward for the polymer reactor on-line fault diagnosis basing on acoustic emission (AE). During the loading process of the reactor, sensors detect the AE signals. According to the acoustic emission and location theory, the fault or flaws of the reactor can be found and located. Further, the assessment of the reactor can be got and it can guide the safety production of the reactor.
Study on One-Step Injection Moulding Technology of Screw Drill Stator Bushing
Authors: Jiao Dong Mei , Lv Bai Yuan
Published: March 2011

This thesis presents one kind of new moulding technology of screw drill stator bushing--one-step injection moulding technology, based on which the one-step injection moulding equipment is developed. In the meantime, the compounding to produce screw drill stator bushing is proposed. Experiment on this equipment and the compounding proved this equipment has energy-saving, room-saving, structure-compacting, and low labor-consuming qualities. Moreover, the products have higher density, longer service life, and lower rejection ratio.
Research of Soccer Robot Target Tracking Algorithm Based on Improved CAMShift
Authors: Huang Yi Hu , Wang Jin Li , Jia Xi Mei
Published: March 2011

According to the vision needs of robot soccer and CAMShift tracking inefficient in dynamic background, a new tracking algorithm is brought forward to improve the CAMShift in this paper. A real-time updating background model is build, by traversing the search area for all target pixels to statistic and calculate the color probability distribution of the color target, statistical principles and minimum error rate of Bayesian decision theory are used to achieve a more accurate distinction between the target and the background. By comparing with the CAMShift, the new algorithm provides a better robustness in the soccer robot game and can meet the purposes of fast and accurate tracking.
Preparation and Characterization of Spherical Lignin/Polylactide Composite Adsorbent
Authors: Zhu Heng , Lin Xiao Yan , Zhuo Xiu Rong , Luo Xue Gang , Zhang Chi
Published: March 2011

The spherical lignin/polylactide (PLA) adsorbent was prepared by solvent evaporation. The dispersed phase contents, the PLA concentration and ratio of PLA to lignin on the diameter and mechanical strength of the PLA/lignin composite adsorbent spheres were investigated and the morphology structure and mechanical strength of the adsorbent were characterized by scanning electron microscope (SEM) and dynamic mechanical analyzer (DMA). The results showed that the adsorbent has porous structure, and the mechanical strength increased significantly as the ratio of PLA to lignin as 4:1.
Preparation and Properties of High Performance Polyimide Foam
Authors: Qi Kai Liang , Zhang Guang Cheng , Li Song Ming , Liu Liang Wei , He Zhen
Published: March 2011

High performance polyimide (PI) foam has been prepared by esterification method using benzophenone tetracarboxylic acid dianhydride (BTDA) and diamino diphenylmethane (MDA) as the main materials in the mixture of methanol and tetrahydrofuran (THF). The cellular structure, thermal properties and flame retardance properties of PI foam were characterized by hot stage optical microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetic analysis (TGA) and limiting oxygen Index (LOI), respectively. The results showed that the cellular structure was more ideal when the particle diameter of polyester ammonium salt (PEAS) precursor powder was 100μm; the glass transition temperature (Tg) of PI foam was more than 300°C, 5% weight loss temperature was above 500°C, LOI was as high as 50% and sound absorption was over 0.5.
Experimental Study on Surface Damage in Forming of Galvanized Steel Sheets
Authors: Hou Ying Ke
Published: March 2011

U-channel forming tests were performed to investigate the surface damage behavior of hot-dip galvanized (GI), galvannealed (GA) and electrogalvanized (EG) steels in sheet metal forming (SMF). Experimental results indicate that the surface topographies of galvanized steels are roughening with the number of forming in sheet metal forming (SMF) and the types and mechanisms of surface damages of the three coatings are different. And tool hardness has great effects on surface damages of the GI and GA steels while the influence of tool hardness on surface damage of EG steel is negligible.
Development of Carton Black’s Dispersion Evaluation System Based on Statistics
Authors: Wang Xiao Bo , Wang Chuan Sheng , Zhang De Wei
Published: March 2011

Digitization of carton’s dispersion is important for rubber researching. In statistics, kurtosis and skewness can been used to evaluate the dispersion, control chart can been used to decrease the influence of abnormal factors. The application of computer technology can finish calculating and showing of statistical data quickly and exactly. Digitization of distribution supplies more ways to research the relation between carton’s dispersion and rubber’s property.
Eicosane/Polycarbonate Composite as Form-Stable Phase Change Materials for Latent Heat Thermal Energy Storage
Authors: Wang Yi , Xia Tian Dong , Feng Hui Xia
Published: March 2011

The aim of this research is to prepare of a novel form-stable composite phase change materials (PCMs) for the latent heat thermal energy storage (LHTES) in buildings, passive solar space heating or functional fluid by incorporation of eicosane within Polycarbonate (PC) through solution casting technique. The composite PCMs was characterized using scanning electron microscope (SEM) and fourier transformation infrared (FTIR) analysis technique. The results show that the form-stable blends was formed and the maximum encapsulated proportion of eicosane in the composite was 50 wt% without melted PCMs seepage from the composite. In the shape stabilized PCMs, the polymer acts as the supporting material to form the there dimensional network structure and the eicosane acts as a PCMs and disperses in the three-dimensional network structure. Thermal properties, thermal reliability and heat storage or release performance of the composite PCMs were determined by differential scanning calorimetry (DSC), FTIR and thermal cycling test analysis. The melting and freezing temperatures and the latent heats of the composite PCM were measured as 36.2°C-40°C and 62.2 J/g - 63.1 J/g, respectively. The results of DSC, FTIR and thermal cycling test are all show that the thermal reliability of the composite PCMs has an imperceptible change. This conclusion indicates that the blends have a good thermal and chemical stability.
Research on Bonding of PMMA Microfluidic Chip with Precisely Controlled Bonding Pressure
Authors: Jiang Bing Yan , Zhou Zhou , Liu Yao
Published: March 2011

Microfluidic chips have a great prospect in the field of biochemical analysis with advantages of fast processes, high flux and low consumption. Molding and bonding are separated by the conventional procedure of hot embossing and bonding, resulting in low automation and long production cycle. In order to reduce cycle time and achieve mass production, this paper proposed In-mold Bonding technology with precisely controlled bonding pressure by injection molding machine’s movement of core-pulling. So simulation analysis for bonding process of PMMA microfluidic chip was carried out using finite element software to study microchannel distortion at different bonding temperature and pressure. The results show that, at a certain bonding pressure, when bonding temperature was lower than glass transition temperature(Tg), microchannel distortion didn’t change significantly, when bonding temperature was higher than Tg, microchannel deformation increases with increasing temperature. Small microchannel distortion was obtained at a temperature of 108°C,which was recommended as the suitable bonding temperature.
Renal Sympathetic Denervation for the Treatment of Difficult-to-Control or Resistant Hypertension
Authors: Papademetriou Vasilios , Doumas Michalis , Tsioufis Konstantinos
Published: March 2011

Hypertension represents a major health problem with an appalling annual toll. Despite the plethora of antihypertensive drugs, hypertension remains resistant in a considerable number of patients, thus creating the need for alternative strategies, including interventional approaches. Recently, catheter-based renal sympathetic denervation has been shown to be fairly safe and effective in patients with resistant hypertension. Pathophysiology of kidney function, interaction and crosstalk between the kidney and the brain, justifies the use of renal sympathetic denervation in the treatment of hypertension. Data from older studies have shown that sympathectomy has effectively lowered blood pressure and prolonged life expectancy of hypertensive patients, but at considerable cost. Renal sympathetic denervation is devoid of the adverse effects of surgical sympathectomy, due to its localized nature, is minimally invasive, and provides short procedural and recovery times. This paper outlines the pathophysiological background for renal sympathetic denervation, describes the past and the present of this interventional approach, and considers several future potential applications.