bluuebunny/crossref_metadata_2025 huggingface dataset:
Applied Research on Modified Polyacrylonitrile Fiber with Collagen
Authors: Hu Xue Min , Xiao Chang Fa
Published: November 2012

The surface modification process for polyacrylonitrile fiber which was hydrolyzed first, and then grafted with collagen was studied. The optimum process was as follows: concentration of alkaline 12%, time 10min, temperature 80°C, ratio of water and PAN fiber was 100:1. The method for surface modification of polyacrylonitrile fiber was determined from comparative analysis, and the optimum process: collagen solution concentration at 5%, pick-up at 900%, pre-baking 15min at 70°C, baking 15min at 110°C. Compared with original polyacrylonitrile fiber，the breaking strength and elongation of collagen modified polyacrylonitrile fiber decreased, while the moisture regain increased from 2% to 6.1%.
Comparison of the Properties of Akund/Cotton Blended Yarn Produced by Compact Spinning with Pure Cotton Yarn
Authors: Jiang Xiao , Wang Qin , Cheng Long Di , Yu Jian Yong
Published: November 2012

As a kind of environment-friendly fiber, akund will create considerable interest in the apparel industry due to its fine luster, good moisture absorption, renewable and pollution free feature. This research is a comparative study of the physical properties of akund/cotton material and pure cotton material. Results show that the enhanced structure of akund/cotton compact yarn typically results in a lower hairiness and improved mechanical properties. However, the weaving of this kind akund/cotton blended yarn may meet a lot difficulty since its tenacity value hardly meet the minimum value calls for weaving. Another important guidance is that it necessary to reduce short fiber content that may be present in the yarn structure to adopt best evenness.
Effect of Low Molecular Weight Ethylene Homopolymer on Structure and Properties of Bimodal High Density Polyethylene
Authors: Shi Xing Bo , Wang Ju Lin , Cai Xiao Ping
Published: November 2012

The effect of low molecular weight (LMW) ethylene homoploymer on the structure and properties of bimodal high density polyethylene (HDPE) was studied by blending two commercial bimodal HDPE resins (tandem reactor) with two types of LWM ethylene homopolymer. The molecule weight and molecule weight distribution, crystsallinity, rheological and mechanical properties of composites were characterized by high temperature gel permeation chromatography (HT-GPC), differential scanning calorimetry (DSC), capillary rheometer respectively. For composites of bimodal HDPE and LMW ethylene homopolymer, the polydispersity index (PDI) and crystallinity can be effectively increased when reduce the molecular weight of first reactor in tandem reactor. The viscosity of composites decreases at high shear rate. Increasing of LMW component has a positive effect on processing properties and tensile strength, while makes composites brittle.
Study on Magnesium Hydroxide Sulfate Whisker and Organo- Modified MMT on Flame Retarded Liquid Silicone Rubber
Authors: Zhang Xiao Ying , Wang Guo Hui , Liu Dan , Deng Xin Hua
Published: November 2012

Taking two-component additional liquid silicone rubber (LSR) as base rubber, silica white carbon black as reinforcing packing material. Analyze and compare the combustion performance and mechanical properties of three flame retardant liquid silicone rubber compound, including Magnesium Hydroxide Sulfate Whisker(MHSH), the stearic acid sodium surface treatment of MHSH(MHSH-1), MHSH-1 and organo-modified MMT (MHSH-1/OMMT). The results show that the MHSH-1/OMMT can improve the tensile strength of LSR, and have a unique advantage in improving the flame resistance of LSR.
The Development of Permanent Strong Magnets and its Application in the Deironing of Kaolin
Authors: Fu Gui Wu , Liu Jun , Wang Yu Hua
Published: November 2012

This paper considered that putting the specialized soft magnetic material in the permanent magnetic field with a particular structure and the magnetic field strength can make it be magnetized, finally the surface of the soft magnetic material will produce twice strength than that of original permanent magnetic field. And we made a analysis for said phenomenon. We introduce d the deironing machines of permanent magnet strong magnet and high-gradient permanent magnet which are manufactured based on this principle. They can effectively remove the iron mineral of "kaolin" and its principles and structure is simple but it has the advantages of high efficiecy, energy saving, environmental protection. So it provides important references to chemical industry, ceramics and other industries which apply kaolin technologies.
A LED Reflector Design and Research for Uniform Rectangular Illumination
Authors: Yang Hai Bo , Chang Shao Liang
Published: November 2012

In order to utilizing the light flux reasonably and effectively, the LED reflector which is designed according to light reflection principle, makes the light emitted from LED resource spread in a specific direction through reflection. The problems about LED oblique illumination are described in the paper. By comparing the optical properties of elliptical and parabolic and using the optical modeling software, a compound trough reflector is designed. The irradiance map of optical simulation shows that a uniform rectangular spot is shaped on the lighting plane and the optical efficiency reach up to 72.3％.
An Alternative Design of Light Delivery System for Heat-Assisted Magnetic Recording
Authors: Limcharoen Alonggot , Pakpum Chupong , Witit-Anun Nirun , Chaiyakun Surasing , Limsuwan Pichet
Published: November 2012

The light delivery system is an important component in heat-assisted magnetic recording technology. It needs a light source and delivery the laser beam to the slider for writing process. However, the different designs lead to the different manufacturing processes, number of process steps and technologies consequently affect to the fabrication cost. This paper aims to propose an alternative design for a light delivery system. The complicated processes to manage a heat in a manufacturing are also take into account to have the final product meets the requirement for HAMR technology. The components are also fabricated which is made for a design and also presented.
Research on the New Multilayer Composite Lightning Electromagnetic Shielding Materials
Authors: Zhao Xiao Gang , Zhou Yi , Guo Yu Zhang , Lin Zi Jun , Zhu Jian Cheng
Published: November 2012

According to the characteristics of lightning electromagnetic pulse (LEMP) in information systems, the new multilayer composite electromagnetic shielding materials are utilized for the effective protection of the lightning hazards. The lightning protection mechanism and the characteristics of the new electromagnetic shielding materials are investigated. The shielding and reflection principle of the new materials are carried out. The electromagnetic shielding tent which is made of such multilayer composite electromagnetic shielding materials are applied in the integrated lightning protection of information systems, which shows such materials are safe, convenient, practical and worthy of widely application.
Synthesis of Diester Based Magnetic Fluid
Authors: Cui Hai Rong , Wang Xue Feng
Published: November 2012

Diester based magnetic fluid is a novel intelligent material which use diester as carrier liquid and magnetic iron ore as magnetic nano-particles combined together with proper surfactant. Its specially unique characteristic contributes to wide applications in engineering research field such as magnetic fluid based seals, magnetic fluid based dampers and so on. This paper provides a method of diester-based magnetic fluid synthesis and analysis for the properties of prepared diester magnetic fluid as well as effective influencing parameters. The results show that for getting proper size and magnetization of magnetic particles, the proper reacted temperature is around 60~80°C, appropriate molar ratio of reacted solution is 1.75 and concentration of forerunner is about 0.6 mol/L. It is also found that the viscosity of diester-based magnetic fluid is decreased with environment temperature while the viscosity as well as saturation magnetization increases with the increment of density.
Study on Antistatic PET/PTT-CNTs Composites
Authors: Hao Liang , Fang Xie , Liu Hui Ru , Xie Guang Qi
Published: November 2012

The CNTs have been incorporated in PET/PTT matrix and PET/PTT-CNTs composites have been prepared. The CNTs can act an effective nucleating agent in the PET/PTT matrix and the percolation threshold in PET/PTT-CNTs composites is about 6 wt%. SEM graphs indicated that the CNTs are well dispersed in the PET/PTT matrix.
Study on the Preparation and Properties of Li4Ti5O12 Powder
Authors: Wang Neng Wei , Huang Zai Chun , Cui Xu Mei
Published: November 2012

Lithium titanate (Li4Ti5O12) was synthesized by solid-state method with anatase titanium dioxide and lithium carbonate(Li2CO3) as raw materials at 800°C,900°C and 1000°C for 12h, respectively. The prepared powder was characterized by XRD, SEM and constant current charge/discharge test. The results showed that the calcination temperature effected on the properties of Li4Ti5O12 powder, the crystallinity and particle size of powder were changed with the calcination temperature. Li4Ti5O12 had good performance of 1ithium insertion/extraction, stable charge/discharge platform, excellent multipule cycles of high capacity at 900°C.
Study on the Harmless Treatment of Valve Regulated Lead-Acid Batteries in Substations
Authors: Li Dong Mei , Xu Yan Li , Zhao Guang Jin , Wang Yong Wei , Guo Yang
Published: November 2012

It is reported that large quantities of valve regulated lead-acid batteries used in the substations shall be harmlessly treated, for lead plates, sulfuric acid and other compositions are direct hazard for the environment. Herein, we have carried out the investigation on the reconstruction and reuse of the used VRLA, battery reconditioning, influence of spent VRLA to the environment, storage condition obeying to environment of state grid and directed cycle model of recycling technologies.
TCF High-Brightness Bleaching NaOH-AQ Pulp of Fast-Growing Poplar with Low Kappa Number
Authors: Ji Xing Xiang , Chen Jia Chuan , Yang Gui Hua , Tian Zhong Jian
Published: November 2012

In the paper, technological conditions suitable for H2O2 strengthened oxygen delignification of fast growing poplar NaOH-AQ pulp with low kappa number (Kappa number 13.5, viscosity 851ml/g, brightness37%ISO) were investigated, based on which (Q/OP) QP Totally Chlorine Free (TCF) bleaching sequence was studied, and the TCF high-brightness bleaching of NaOH-AQ pulp with low kappa number was realized. Conditions better suitable for (Q/OP)QP bleaching of NaOH-AQ pulp with low kappa number are as follows: at the stage of H2O2 strengthened oxygen delignification: pulp consistency 10%, alkali dosage 2.5%, H2O2 dosage 3%, MgSO4 dosage 0.5%, oxygen pressure 0.6Mp, temperature 100°C, time 60min; at Q stage: pulp consistency 8%, DTPA 0.3%, initial pH value 4, temperature 70°C, time 120min; at P stage: pulp consistency 10%,H2O2 dosage 2%, MgSO4 dosage 0.5%, Na2SiO3 dosage 0.7％, temperature 70°C, pH value 12, time 120min. With this sequence, the pulp can be bleached with brightness of 82.0%ISO, viscosity 716ml/g, and the bleached pulp yield ratio 91.78％.
Properties of Municipal Solid Waste Incineration (MSWI) Fly Ash during Heating Process
Authors: Wang Xiao Bo , Zhao Zeng Li , Yan Chang Feng , Li Hai Bin , Chen Yong
Published: November 2012

Weight loss and heat flow during heating process of municipal solid waste incineration (MSWI) fly ash were investigated through the DSC-DTG experiment carried out from 40°C°C to 1400°C°C, with different heating rates (5°C/min, 10°C°C/min, 20°C°C/min) and different atmosphere (N2, Air). Two main weight loss peaks were found at 800°C°C-1000°C°C and 1000°C°C-1200°C0°C for three different samples. Weight loss ingredients were analyzed by comparing the difference of components between fly ash and slag. Then Kinetics parameters of fly ash melting were acquired by Numerical Solution using a C++ program.Introduction
Study on the Reclamation Technology of Alkaline Phenol Formaldehyde Resin Bonded Sand
Authors: Sun Qing Zhou , Wang Jian , Zhang Pu Qing , Han Yong
Published: November 2012

In this article we study the reclamation technology of alkaline phenol formaldehyde resin bonded sand. We find that there are a lot of evaporation components in the alkaline phenol formaldehyde resin bonded sand, and they can be effectively removed by drying or baking. The loss of ignition of the sand before and after the mechanical regeneration can be reduced by the baking of alkaline phenol formaldehyde resin bonded sand; it also can improve the stripping rate of the reclaimed sand. The acid demand value of the reclaimed sand increases with the increasing of temperature and reaches the maximum at 500°C, when the alkaline phenol formaldehyde resin bonded sand is baked below 500°C, and then the acid demand value of the regenerated sand reduces when the baking temperature increases. The tensile strength of alkaline phenol formaldehyde resin bonded sand mixed by the regenerated sand obtained by the 360°C baking and mechanical regeneration is higher than that of the sand mixed by the regenerated sand obtained by other methods in the case that the service time and the molding sand mixed by the base sand are the same, and has the best casting process performance.
GC–MS Analysis of Petroleum Ether and Butyl Alcohol Extracts of Longan Seeds
Authors: Li Niang Hui , Wang Chao , He Qing , Wu Ping Ping , Huang Ru Qiang
Published: November 2012

In this study, the chemical proﬁles of petroleum ether and butyl alcohol extracts of longan seeds were systematically characterized using gas chromatographic mass spec-trometry (GC–MS). 33 and 9 kinds of compounds were identified respectively.
Research on the Relationship between Strength and Chemical Composition of Hemp Fiber
Authors: Ji Ying Chao , Liang Yu Jia , Qi Dan Ning
Published: November 2012

The paper starts with the fiber strength which is one of the most important factors that could influence the fiber spinnability. By discussing the relationship between fiber strength and its four chemical compositions and analyzing the relevance between them with the method of grey correlation, this research come to a conclusion that the content of cellulose influence most on the fiber strength, and the second is lignin. Then set up four grey models between the fiber strength and pectin, hemicellulose, cellulose and lignin, and carry on error analysis at last. This paper makes a contribution to provide the theoretical basis to the research and development of the hemp fiber.
A Measuring Method of Flexible Bar Based on Machine Vision
Authors: Liu Shao Wei , Liu Wu , Ding Guo Qing , Chen Xin
Published: November 2012

This paper studies a high-precision measuring method about minimum thickness of thin neck and bending rigidity of flexible bar based on machine vision. The measurement system combines with the advantages of image vision inspection and laser displacement detection. After rough leveling and precise leveling to the clamped workpiece through the interworking of the camera, laser displacement sensor and servo motor, the image of thin neck and the upper profile of workpiece are captured by camera and laser displacement sensor respectively. Then the workpiece is rotated 180 through servo motor so as to capture the image of thin neck again and detect the bottom profile. Based on the two groups of images and profiles acquired above, we can figure out the minimum thickness of thin neck and bending rigidity of the workpiece with high precision. The effectiveness and feasibility of this method are confirmed by computer simulation with ANSYS software and experimental results with needle gauge and flexible bar.
Study and Simulation of AC Motor Vector Control Based on SVPWM
Authors: Zong Jian , Ding Zhao Hong , Zhou Xiao Jie
Published: November 2012

This paper mainly study the Space Vector Pulse Width Modulation (SVPWM) algorithm of AC motor control system, Vector control strategy of the SVPWM voltage source inverter fed AC motor studied. In order to testify the correctness of the control strategy, simulation method is proposed to modify the motor speed and realize a simple and high performance speed control system. This system has been implemented on dynamic simulated tool simulation of MATLAB software in AC motor. Results show that the method gives satisfying rotor speed in the whole speed range and can improve the control precision.
Study on Parameter Determination for ECM Equivalent Circuit
Authors: Akimoto Benjamin , Natsu Wataru
Published: November 2012

The analysis of the ECM model expressed by an equivalent circuit is helpful to understand the ECM characteristics, such as the removal rate and machining accuracy. However, the parameters in the ECM equivalent circuit have not been determined yet, although several kinds of equivalent circuits were proposed. In this research, the parameters of the ECM equivalent circuit were determined experimentally, and the determination reliability was discussed.
A Novel Optical System for Investigation on the Characteristics of Light Emission from Long Plasma Column
Authors: Li Xue Chen , Jia Peng Ying
Published: November 2012

Although intensified charge coupled device (ICCD) is conventionally used to investigate the breakdown mechanism in gas discharge. ICCD can not be used to study the long plasma column because it is hard to be imaged. For solving this problem, a novel optical system is proposed which consists of several elements. Each element is composed of one collimator and a photomultiplier tube. Using this system, spatial resolved emission signal can be obtained. Results show that the light emission signal from each area shows a pulse with a width of about 3μs. It is interesting that the time lag in each half cycle increases with the increase of distance away from the dielectric barrier discharge (DBD). This phenomenon implies that the plasma bullet always leaves DBD at the rising edge of the applied voltage. The time lag versus the distance from DBD is used to calculate the propagation velocity of the discharge.
Object Oriented Method in Information System Design
Authors: Rao Hao
Published: November 2012

This paper combines the software developing method with the object_oriented technology, uses the object_oriented technology to abstract objects for the information system. And the attribute, method, relationship of Object_Oriented Data Model have been described. The object_oriented data model is more compatibly with real world. And the information system base on object_oriented data model is propitious to be maitained and understood.
Multi-Objective Optimization Model of Export and Transit Containers Storage in a Transshipment Port Yard
Authors: Wang Bin , Yang Tao
Published: November 2012

To effectively improve the competitiveness of port enterprises, container yard stacking optimization is an important way to raise their benefit. A multi-objective optimization model for containers stacking in the storage yard based on 0-1mixed integer programming is built to improve its efficiency. The objective function is to minimize the number of yard cranes used in the storage yard and balance the workload among different blocks during the planning period. The decision variables include the number of transit and export containers assigned to yard-bits, yard cranes distributed to blocks, yard-bits with high and low workload in a block. The constraints include meeting the shipping requirement, storage capacity and operational capacity of yard cranes. A numerical example is given and solved by Lingo9.0. The simulation is done to recover the relation between workload level and the number of yard crane used and the workload balance. The model can be used to yard stacking management and lift its level for a transshipment port.
An Improved Random Number Generator Based on Chaotic Map
Authors: Li Zheng , Ye Shao Kang
Published: November 2012

This paper pointed out that we can determine the initialization x0 when the random sequence is generated by the piecewise linear chaotic map in finite precision, and aimed at solving this objection, an improved measure of perturbing the system variable timely is proposed, and an improved random number generator based on chaotic map is designed and realized. Meanwhile, their working process and theory are analyzed, and the simulation, validation and test of the whole system is finished, and the result indicated that the bit rates is up to 20 MHz and the random number could pass the FIPS140-2 randomness test.
Research on the Material Tracking Management System in the Magnetic Pump Assembly Process
Authors: Chen Hao , Gao Tian Yi , Mu Guang Yu , Pan Lan Lan
Published: November 2012

The material tracking management system in the magnetic pump assembly process is studied to the machine shop and assembly shop of a pump company as an example. The system mainly includes production line management module, assembly process management module, material tracking management module and work in process (WIP) tracking management module. In this system, the workshop visual management, real-time status information collecting on-site, materials status monitoring, and product life cycle file establishing are implemented. The functions of product assembly processes tracking can be realized, so that the traceability of the parts, components, WIP and products in the process can be achieved. The system ensures the material supply timely and equipment operation normally in the production processes.
Simulation Analysis of Motor Vehicle Ride Comfort Based on Adams
Authors: Li Cai Bin , Liu Fu Yun , Deng Ju Cai
Published: November 2012

Applying ADAMS to vibration control field of heavy truck. The vibration simulation model of a truck is established. With the simulation model, different acceleration responses under different suspension stiffness and damping force are simulated. The simulation result is close to the actual result. It shows that the simulation method is benefit to reduce the number of vibration experiment and to forecast the vibration response of heavy truck.
Analysis of the Mechanical Properties of Slewing Bearings Using Finite Element Method
Authors: Li Peng , Wang Min , Qi Xiao Li , Feng Jian You , Liu Xiao Hui , Tang Run Qiu , Zhao Wen Ying
Published: November 2012

Slewing bearings are the basic structural components widely used in construction machinery industry. Their stress status and distribution have great influence on the service life. A finite element approach for a single-row slewing bearing is established based on the bilinear isotropic model. The stress status at different loading conditions is simulated with the bearing geometric and material parameters. The result shows that the numerical simulation is reasonable in comparison with the analytical result obtained by Hertz’s theory and provides reliable design guideline for slewing bearings.
Simulation of Fatigue Initiation and Non-Self-Similar Fatigue Crack Growth under Mixed Mode I/II Loading
Authors: Ma Chen Chen , Wang Xiao Gui
Published: November 2012

The fatigue initiation and non-self-similar fatigue crack growth behavior of three notched compact tension and shear specimens of 16MnR steel under mixed mode I/II loading were investigated. The plane-stress finite element model with the implemented Armstrong-Frederick type cyclic plasticity model was used to calculate the elastic-plastic stress-strain responses. A recently developed dynamic crack growth model was used to simulate the effects of loading history on the successive crack growth. With the outputted numerical results, a multiaxial fatigue damage criterion based on the critical plane was used to determine the location of fatigue initiation. A formula of fatigue crack growth rate, which is based on the postulation that the fatigue initiation and crack growth have the same damage mechanism, was then used to calculate the transient crack growth rate and determine the non-self-similar crack growth path. The predicted fatigue initiation position, crack path and crack growth rate are in excellent agreement with the experimental data.
Optimizing the Performance of Chip Shooter Machine Based on Ant Colony Algorithm
Authors: Du Xuan , Yu Gang
Published: November 2012

The component placement sequence and feeder arrangement are two critical factors determining the assembly time of chip-shooter machine (CS). In addition, the different size of component and different arrangement strategy affect the feeder arrangement and component placement sequence. Based on the engineering analysis, an integrated optimization model of printed circuit board (PCB) assembly for CS machine is established. According to the parallel placement character of CS machine, "Max-Min Ant Colony Algorithm with Communication function (MMAC)" is designed based on traditional Ant Colony Algorithm. The idea that two ants with different duties collaborate to solve the optimization problem is presented. Guide ants optimize placement sequence while executant ants optimize feeder arrangement according to the components placement sequence. The component placement sequence and feeder arrangement are optimized simultaneously
The Effect of Aging on Energy Absorption Capability of Closed Cell Aluminum Foam
Authors: Jeenager V.K. , Pancholi Vivek , Daniel B.S. Sunder
Published: November 2012

The role of cell wall microstructure in inﬂuencing the mechanical behaviour of closed cell aluminium foam was investigated. The morphologies of the cell wall were characterized by using optical microscopy. An attempt has been made to describe the relationship between the microstructure of cell wall and mechanical properties primarily pertaining to the compressive response. The closed-cell foams in as-foamed and aged condition, having rather similar relative densities and cell structures but significantly different cell-wall microstructure have been examined. It was found that in as foam condition thick dendritic structure is present. On ageing at different temperatures for different duration, it was found that as ageing progresses the dendritic structure break in to finer precipitates resulting in improvement in microstructure of the cell wall. The compression tests also affirm the microstructural contribution to energy absorption capability.
HVOF Coating of µ-WC-Metal Powder and Laser Heat-Treatment of the Coating for the Improvement of Turbo Shaft Material
Authors: Cho T.Y. , Joo Y.K. , Yoon J.H. , Chun H.G. , Zhang S.H.
Published: November 2012

A hybrid surface treatment was performed to improve the surface properties and the durability improvement of turbo shaft material Inconel718. A micron sized (µ) WC-metal powder (86% WC 10% Co 4% Cr) was coated onto a substrate surface using HVOF thermal spraying, and the coating was heat treated by a CO2 laser. With the HVOF coating of the powder onto the substrate, the surface hardness of substrate increased approximately 300% from 399 Hv to 1260±30 Hv, and further increase of approximately 40% from1260±30 Hv to 1820±100 Hv by laser heating the coating for 0.6 s. Porosity of coating decreased more than five times from 2.2±0.3% to 0.4±0.1% by laser heating. According to the reciprocating sliding test, friction and wear behavior of coating improved by coating for both sliding surface temperature of 25°C and 450°C. Therefore, the HVOF coating and laser heat treatment of coating are recommended for the durability improvement of turbo shaft materials.
Development and Study of the Possibilities to Use Natural Materials for Thermal-Insulation Systems of ETICS
Authors: Hroudová Jitka , Zach Jiri
Published: November 2012

Thermal insulation systems of ETICS are now mostly solved in the building industry, whether in terms of insulating the structures, choices of materials and subsequent recycling after the end of their life period. From the environmental point of view and also in the perspective of sustainable development, it is essential to look for other suitable material bases which relate only to easily renewable sources of raw materials or to industrial wastes which have long been available in sufficient quantity and quality. It is important that production of the insulation systems is energetically efficient modest in terms of manufacturing facilities. The aim of this paper is to verify the possibility of using natural insulation materials for thermal insulation systems ETICS. This paper describes the results of studies of key properties of insulations based on industrial hemp and flax and the results of computational simulations of the behavior of these insulations incorporated in the real systems ETICS.
Application of Technical Hemp into the Structure of Cement-Chip Boards
Authors: Keprdová Šárka , Bydžovský Jiří , Melichar Tomáš
Published: November 2012

Cement-chip boards are building elements that combine the advantageous properties of wood and cement. It is this synergistic effect which determines the versatile use in the building industry. The boards can be used in any place where the favourable properties of this construction material can fully be appreciated. The disadvantage of the cement-chip boards remains in their relatively high price. Reduction of the price and possible improvement of physical and mechanical properties can be achieved by partial substitution of the raw materials. The basic ingredients of the cement-chip board include the binding material (cement) and filler (wood). The filling material may be partially replaced by secondary raw materials or completely replaced by other herbal sources, such as technical hemp. As the individual components mutually influence each other and, as their effects may not only be added up (additive effect), but also mutually reinforced (synergistic effect), it is not so easy to determine the optimal recipe as it may seem at first sight. This article deals with the use of technical hemp shives as a replacement of filling component of the cement-chip boards. To evaluate the possibility of future use of the boards in building structures, the physical and mechanical properties were monitored. Special emphasis was placed on tests of flexural strength, modulus of elasticity and volume weight. The mixture must meet the technical parameters related to the cement-chip boards.
Free Vibration of Simply Supported Piezolaminated Composite Plates Using Finite Element Method
Authors: Bajoria Kamal M. , Wankhade Rajan L.
Published: November 2012

Piezolaminated smart structures are becoming more popular as they can be used as light weight structures to control structural response in various structural applications. Piezoelectric materials have direct and converse piezoelectric effects which can be adequately employed to control the deflection, shape and vibration of the structure. A finite element methodology based on higher order shear deformation theory is developed for free vibration analysis of smart piezolaminated composite plates subjected to combined action of electrical and mechanical loading. To achieve the accurate prediction of the frequencies, a finite 2D isoparametric element for the mechanical displacement field is combined with an electric potential field. Numerical results are presented for free vibration analysis of simply supported piezolaminated composite plate considering different electric condition with varying thickness to span ratio.
Three-Dimensional Micro-Displacement Control System for a Conductor Defect Detection System
Authors: Wang San Sheng , Fan Liu Bin , Chen Gong , He Tong
Published: November 2012

This paper proposes a method to detect conductor defects in the field of modern non-destructive testing technology. A self-magnetic field induced by flowing current in the conductor is used in the detection technique, and a three-dimensional micro-displacement stage platform is used to scan the sample surface to obtain the self-magnetic field mapping of the whole sample. The subsequent data processing and imaging technology of the detection signal is also developed. To achieve precise positioning of the triaxial directions, an STM32 microcontroller (MCU) is used as the central processor to design the displacement control system, which communicates with a PC computer through the MCU system. The experimental results demonstrate that the stepper motor driving the magnetic sensor could run uniformly and that the proposed system has the advantages of smooth motion, low noise and high precision. As a consequence, the micro-displacement control system can be used to get a clear mapping of the defects in the sample.
Hybrid Spectrum Access and Power Allocation Based on Improved Hopfield Neural Networks
Authors: Yang Min , Jiang Ming Yan
Published: November 2012

This paper aims to solve the optimization power allocation problem based on cognitive radio network system. We propose a Hybrid Spectrum Access (HSA) method which considers the total transmit power constraint, the peak power constraint and the primary users’ tolerance. In order to solve this combinational optimization problem and achieve the global optimal solution, we derived a Simulated Annealing-Hopfield neural networks (SA-HNN). The simulation results of the optimized ergodic capacity shows that the proposed optimization problem can be solved more efficiently and better by SA-HNN than HNN or Simulated Annealing (SA), and the proposed HSA method by SA-HNN can achieve a better ergodic capacity than the traditional methods.
Control Design for Two Cylinders Loading System of Bellows
Authors: Wang Min Gang , Liu Yu Ting , Li Wei , Yang Yao
Published: November 2012

Bellows is a thin-walled metal cylindrical with folds, as a pipeline connection and compensation device, it has the feature such as reliable and compact. Now Bellows is widely used in the produce of aerospace engines and the relative industries. In order to solve the load life test problem of bellows, the squeezing and twisting process after the long time loading is simulated by swinging and pressing it rapidly in a short time. Adopting NI Real-Time Hypervisor，a real-time monitor and test system is built by Windows operation system. According to the real twist data of bellows,the dynamic equation of swing platform for two cylinder is constructed, by the real-time and a high precsion control of the motion of two cylinders, the bellows which is full of liquid has been squeezed and twisted with a high frequency, and loading test of the mechanical properties, strength and lifetime for bellows is achieved in an automatic way.
Research on the Mixed Scheduling Algorithm of Networked Control System Based on CAN Bus
Authors: Chen Zai Ping , Yang Fang Fang
Published: November 2012

CAN-based message scheduling problem is illustrated in detail in the thesis, the merit and demerit of the typical dynamic (EDF) and static RM) scheduling algorithm and the influence on NCS performance are analyzed. A kind of MTS is put forward, through setting up a NCS3 (containing 3 control loops). With the TrueTime toolbox simulation, the improvement on NCS performance is confirmed, and the Network utilization is improved.
Droplet Transfer on Three Phase Relations at Four-Wire Welding Robot
Authors: Xie Sheng Mian , Zhong Bi Liang , Wu Kai Yuan , Wen Yuan Mei
Published: November 2012

Based on the high-speed photography, the effect of phase relations on droplet transfer and welding seam was analyzed. To each TCGMAW (Twin-wire Co-pool Gas-shielded Metal Arc Welding) torch at four-wire welding robot, under the descriptive welding parameters, when the phase relation of the front wire and the back wire was alternate, the arcs of the two wires had no effect on each other basically; the welding seam shaped very well. When the phase relation was synchronized, the arcs attracted each other and the two arcs centralized to the middle of the two wires; the humping bead was formed. When the phase relation was random, now and then the arcs synchronized and attracted each other, and at times the arcs changed alternately and had no effect on each other; the appearance quality of the welding seam was moderate.
An Experimental Study on the Current-Following Characteristics of a Surface Drifting Buoy
Authors: Dong Yong Jun , Zhang Xiao , Guo Jing Fu , Xu Ming Qi , Zhang Xue Ming
Published: November 2012

The water-following capabilities of surface drifting buoy are investigated through analyzing the hydrodynamic factors which influence the buoy’s floating, so as to improve the precision of ocean currents measured by drifters, and optimize the design of drifters. The force balance equation of surface drifting buoy is established, and the wind coefficient of drifter model is obtained and analyzed. A prototype based on GPS (Global Positioning System) and BeiDou-1 (BeiDou Satellite Navigation Experimental System) is designed to collect surface currents near Gulf of Jiaozhou. Calculated results indicate that the velocity data, which take the wind coefficient into account, are more approaching the measuring value of fixed current-meter. That provides some experimental validities to the modelling and designing of surface drifting buoy. This study also shows that the surface trajectory from GPS and BeiDou-1 float provides a new means to measure surface circulations in the global ocean at real time, and that the estimated currents could be one of the important sources to improve our understanding for ocean dynamics characteristics.
Application of Improved TVD Scheme in Hypersonic Heat-Flux Simulation
Authors: Wang Chao , Wu Song Ping , Cao Ning
Published: November 2012

Numerical schemes play an important role on the calculation of aerodynamic heating in hypersonic flows. An appropriate scheme can effectively distinguish shock, and reduce numerical dissipation to improve numerical resolution near the wall. In this paper the second order TVD (total variation diminishing) scheme was improved to automatically adjust the numerical viscosity, which can appease the above requirements. In this paper two numerical experiments indicated that the numerical method was effective.
The Application of Grouting Technology for Governance of Mined-Out Area under Large Channel
Authors: Yan Qiao , Jia Ping Yang
Published: November 2012

The research on key technology of mined-out grouting filling management in large channels is carried out based on the geology and distribution characteristic, according to YUZHOU coal mining area on the main channel of the middle rout in the South-to-North water transfer project. This article describes the formula of the goaf governance width, material liquid ratio of filling and sealing grouting, and studies the drilling and grouting technology and then proposes the methods and standards of grouting quality inspection which combines the comprehensive analysis of geological CT scanning, grouting texting and grouting result of data.
Establishment of Index Factors in Geohazard Early Warning System
Authors: Cheng Si , Qu Bai Quang , Wang Yun Sheng
Published: November 2012

The process of constructing index factors in regional geohazard forecasting is based on profound research and a comprehension of geohazard mechanisms. Taking a geohazard early warning system in Huaying Mountain, China, as an example, principles and key points on establishing those factors are elaborately analyzed and how to quantify them in a system is represented explicitly.
Thin Cloud Removal Approach for Yellow River Remote Sensing Onitoring
Authors: Chen Lin , Zhou Yi Fu , Jia Hua Le
Published: November 2012

Cloud cover is one of the most common noises of remote sensing monitoring in Yellow River. How to remove or weaken the effect of thin cloud is one of the important tasks. Based on the imaging model and characteristics of thin cloud, some technologic methods to remove cloudy for remote sensing monitoring in Yellow River are introduced, such as the method of filtering in space domain, the method of filtering in frequency domain and the method of band ratio. This paper analyzed the characteristics, application method and work flow of those methods ,and evaluated the application effect of remote sensing monitoring using these methods in Yellow River.
Investigation on Improvement and Design of Automotive Muffler
Authors: Zhao Hai Jun , Zhao Hong Jie , Qi Li , Wang Hai Xia , Chang Jia Dong , Tian Li Ping
Published: November 2012

Improving design of some automotive muffler is introduced, according to the existing problem of original exhaust muffler in is modified, using sound software attenuation characteristic is analyzed, and pressure distribution of muffler inner is performed to calculate adopting three-dimension flow field tool, and the muffler is tested on engine bench. Result shows that Compared with the original muffler, power loss is decreased by about 30%, set-net noise of the original muffler all has dropped dramatically, and it is in the target.
An Improved Ultra-Wideband, Ultra-Short Monocycle Pulse Generator
Authors: Liu Bi Shang , Zhou Jian Ming , Zhou Ju
Published: November 2012

This paper presents an improved ultra-wideband monocycle pulse generator circuit based on step recovery diode. This pulse generator circuit uses short-circuit microstrip transmission line to generate the Gaussian pulse the monocycle pulse. The improved pulse-shaping network employs two schottky diodes and a MESFET to suppress the pulse ringing. The SRD model was built in RF simulation software ADS, and then the design and simulation of the pulse generator circuit was accomplished using this model. The experiments showed an monocycle pulse of 400ps pulse width with good symmetry. The measured results agreed with the simulation.
Research of Subwavelength Metal Hole Arrays Used for Surface Plasmon Resonance Sense
Authors: Zhang Ying Ying
Published: November 2012

In this paper, a new structure with square metal hole arrays was devised for SPR sense, and it was optimized by numerical calculation based on finite element analysis. After optimization, a very narrow SPR peak, which is just tenth of the conventional SPR sensor, can be obtained in the transmission spectrum. Besides, the linear measuring range is more than 0.4 RIU. Consequently, the newly designed structure will be benefit for the ability of resist noise and resolution.
Influence of Material Composition on Ductile Machining of Tungsten Carbide in Elliptical Vibration Cutting
Authors: Zhang Jian Guo , Suzuki Norikazu , Kato Takashi , Hino Rei , Shamoto Eiji
Published: November 2012

Tungsten carbide is a crucial material for glass molding in optical industry. The present study investigated a feasibility of ductile machining of sintered tungsten carbide for glass molding by applying ultrasonic elliptical vibration cutting technology with single crystal diamond tool. Grain size and binder material of sintered tungsten carbide have an influence on hardness and/or toughness of the material. Binder material also has a chemical affinity to diamond. In order to examine the influence of material composition on ductile machining of tungsten carbide, a series of grooving and planing experiments were conducted to several different tungsten carbide workpieces with the different binder phase and the different grain size. The experimental results indicated that micro grooving in a ductile mode can be attained successfully by applying ultrasonic elliptical vibration cutting, while finished surface deteriorates with brittle fractures in ordinary cutting. It was also clarified that grain size and binder material have significant influence on the deteriorations in the surface quality, the tool shape and the cutting forces.
Experimental Verification of Effect of Grinding Fluid Excited by Ultrasonic Vibration
Authors: Ishimatsu Jun , Isobe Hiromi , Hara Keisuke
Published: November 2012

The grinding performance is strongly affected by grain condition. Especially loading directly raises the grinding force, reduces tool life and deteriorates accuracy of machining. In this study, ultrasonic exciter which applies vibration energy on grinding fluid was developed. The resonant frequency of 28kHz. The exciter is set between the fluid supplying nozzle and grinding wheel. The discharging grinding fluid from the nozzle is supplied to grinding wheel between the teeth of comb-shape horn. The performance is verified on surface grinding machine with vitrified WA grinding wheel. It was experimentally demonstrated that the excited grinding fluid prevented the loading and improved the surface roughness even for grinding of aluminum. And also improvement of surface roughness was recognized on alloy tool steel.
Evaluating Positioning Uncertainty of Spherical Targets in Laser Scanning
Authors: Tanaka Ichiro , Masuda Hiroshi , Enomoto Masakazu , Miura Kenjiro Takai
Published: November 2012

Spherical targets are useful for registration of point-clouds. In this paper we discuss the positioning uncertainty by laser scanners. We measured spheres of relatively large diameter from about 9m distance, and calculated their positions by the least-squares fitting. The scanning was iterated thirty times and the standard deviations of fitting result were calculated to indicate positioning uncertainty. The result shows smaller positioning uncertainty in comparison with the range noise listed in the specifications.
Ultra-Precision Cutting of Single Crystal Silicon Using Diamond Tool with Large Top Corner Radius
Authors: Kobaru Yuya , Kondo Eiji , Iwamoto Ryuichi
Published: November 2012

A lot of studies on the ultra-precision cutting of single crystal silicon have been reported and they used the single crystal diamond cutting tools having the sharp cutting edge. However, the diamond cutting tools having small chamfer at the cutting edge are usually used in practical machining shops. In addition, studies on the relationship between the tool wear and the machined surface have been reported little although the relationship is important in practical applications. In this study, ultra-precision cutting of single crystal silicon, using cutting fluids, feed rate, and depth of cut as experimental parameters, were carried out by using the single crystal diamond cutting tools having small chamfer and large nose radius, and effects of the cutting fluids, the feed rate, and the depth of cut on the machining accuracy and tool wear were studied. As a result, the optimum cutting conditions was obtained as follows: the cutting fluid was kerosene, the feed rate was 2.0μm/rev, and the depth of cut was 1.0μm.
Eccentric Error Compensation for Pitch Deviation Measurement of Gears
Authors: Xu Bin , Ito So , Shimizu Yuki , Gao Wei
Published: November 2012

An eccentric error compensation method is presented for the pitch deviation measurement of gears. The eccentric error compensation method mainly consists of the evaluation of the assembly accuracy, the reconstruction of the reference curve and the coordinate compensation of intersection points. The geometrical model of the measurement system was analyzed and the corresponding mathematical model was proposed. A gear with small modulus was adopted as the specimen for the pitch deviation measurement. Experimental results reveal that the values of eccentricity can be extracted from the measured profile successfully and the eccentric error compensation is effective for the pitch deviation measurement of gears.
Damage Monitoring and Evaluation Using AE Sensors for Existing Concrete Bridges
Authors: Wang Chun Sheng , Zhai Mu Sai , Tian Lei
Published: November 2012

The existing concrete bridges are often required to carry an increasing volume of traffic, higher speed and heavier trucks, so the bridge owners pay more attention to the actual fatigue damage and service safety of such structures. In this paper, Acoustic Emission (AE) sensors are used to monitor and evaluate the fatigue and damage of Yaoxian Bridge, which is the first field AE monitoring using Physical Acoustics Company equipment and sensors in China existing concrete bridge. This AE sensor has fine frequency bandwidth of interest to bridge monitoring, which is applicable to local cracking and damage positions and can monitor fatigue cracks and damage in close-range. In the field inspection, healthy monitoring was conducted at several locations, including the box concrete girder webs, bottom plates and deck plates using AE sensors. Based on AE monitoring data, the fatigue and damage conditions of box concrete girders was analyzed in order to propose theoretical basis and the rational advices for Yaoxian Bridge maintenance.