bluuebunny/crossref_metadata_2025 huggingface dataset:
Visibility Analysis for Three-Dimension Urban Landscape
Authors: Yin Chang Lin , Xu Wen Qiang , Zhan Qing Ming , Zhang Hong Hui
Published: February 2012

The visual sensation is an important factor in urban planning. A computer analysis technology based on the three-dimensional Geographical Information Systems (3DGIS) can be used to measure the visibility in urban space. The principle of sight calculations is introduced at first. The visibility analysis models about terrain and buildings are proposed. In terrain visibility analysis, a method based on projection and elevation interpolation is used to calculate the visibility of two points. And in building visibility analysis, another projection method is proposed to judge the relationship between the sight and building. Based on the visibility analysis of two points, an approximate visual field in a plane can be computed in a discrete way. The visibility analysis models are proved to be feasible. Further research that combines the visibility analysis model and the quantitative planning targets is suggested.
Image Encryption Technology Based on Composite Chaotic System and Symmetric Encryption Algorithm
Authors: Zhang Hong Ye , Wang Run Hui
Published: February 2012

An image encryption technology based on multi-dimension chaotic system, spatiotemporal chaotic theory and traditional symmetric encryption algorithm is presented. The scrambling transformation was completed with multi-dimension chaotic system first. Then spatiotemporal chaotic theory was used to deal with gray transformation for each pixel. DES Algorithm was applied to implement image encryption at last. Theoretical analyses and simulated experiment show that the proposed image encryption scheme provides perfect results, larger key space and higher security, so this encryption system has excellent performance against many kinds of attacks.
Monitoring of Blue-Ice Extent on Satellite Images of Grove Mountains, Antarctica
Authors: Zhang Xin , E Dong Chen , Zhou Chun Xia
Published: February 2012

This report presents the finding of seasonal and interannual variations of blue-ice extent in the Grove Mountains, by using images from Moderate Resolution Imaging Spectroradiomete (MODIS) and Landsat. The MODIS raw data were first treated by the pretreatment methods and the blue-ice pixels was separated by the blue-ice mapping algorithm. From the data over three summer seasons, the variation regularity of seasonal blue-ice exposure are summarized. The area grows rapidly from September to December and peaks to about 600km2 by the middle or late of next January, then it declines from February to April. The Landsat images were then processed by supervised classification combining with visual revision. According to the result images over 30 years, the margins of blue-ice feature were compared and the eastward trend of blue-ice extent can be concluded. Besides, the combination of MODIS and Landsat data indicates that the seasonal variation is more obvious than the interannual changes for the Grove blue ice, and the blue-ice areas are sensitive to the change of climate and shortwave radialization.
Strong Nonlinear Optical Response of Bilayer Graphene in the Terahertz Regime
Authors: Ang Yee Sin , Zhang Chao
Published: February 2012

We demonstrate that bilayer graphene exhibits strong nonlinear optical response in the terahertz frequency regime. The electric field strength required to generate single-frequency and triple-frequency nonlinear optical responses comparable to the linear optical response is only moderate and can be easily achieved in laboratory. This strong nonlinear optical response persists even in room temperature. This suggests that bilayer graphene can potentially be utilized in nonlinear terahertz photonics.
Research of Humen Fall Detection Algorithm Based on Tri-Axis Accelerometer
Authors: Gao Yang , Gao Jing Min , Wang Jiu He
Published: February 2012

The real-time monitoring of human movement can provide valuable information regarding an individual’s degree of functional ability and general level of activity. This paper presents a fall-detection technology based on tri-axial accelerometer sensor was introduced. The acceleration data of the activities with the characteristic quantity SVM and SMA was analyzed. A method based on SVM and SMA, that takes the human body activity (erectness/lies down) as the auxiliary criterion to distinguish fall and ADL is proposed, and concrete threshold value and related parameters are summarized in this article. The experiment results proved that this scheme can obtain highly rate of accuracy and this algorithm has very good timeliness.
The Design of Campus Geographic Information System Based on MapX5.0+VB6.0
Authors: Li Hai Feng
Published: February 2012

Because the traditional campus GIS (CGIS) lacks close contact and unified management between the spatial data and attribute data, it can not meet the needs of information construction and management for campus. The author proposes the system construction goals of the “digital campus”, which bases on information and figures technology, after analyzing CGIS model, functions and features.VB6.0 is the developing tool and MapX the components of MapInfo is the developing platform. The campus information’s stratification method of spatial database, the table structure of attribute database and functions of system are designed by the author. And the functions of data input, output and update; display and maintenance maps; query the shortest path are all studied. They are all the useful exploration for establishing the CGIS.
Integrating Multi-Temporal Spectral and Structural Information from ALOS/AVNIR-2 Images to Map Heterogeneous Land Use/Cover: A Hybrid Approach
Authors: Song Shu Yi , Jin Xi , Shi Zhou
Published: February 2012

Applicability of remotely sensed data in heterogeneous land use/cover mapping has been greatly be restricted, given the fragmented distribution and spectral confusion of land cover features. In addition, ALOS/AVNIR-2 data, which show great potential for land use/cover mapping considering the high-resolution but low-cost characteristics, have not received too much attention. A new hybrid methodology to address these issues is proposed. This approach combines traditional supervised classifiers and unsupervised classifiers and integrates multi-temporal spectral and structural information from ALOS/AVNIR-2 images. The multi-temporal spectral and structural information are then used as auxiliary data through a rule-based decision tree approach to generate a final product with enhanced land use classes and accuracy. A comprehensive evaluation of derived products of the northern part of Shangyu City in eastern coastal China is presented based on official land use/cover map (1:10000) as well as inter-classification consistency analyses. Overall accuracy of 86.5% and Kappa statistics of 0.84 have been achieved, which are significantly higher than those obtained from the Maximum Likelihood classifier and ISODATA classifier. The hybrid approach presented here is straightforward and flexible enough to be generalized so the approach can be applied to interpret similar fragmented land use/cover using various remotely sensed source data.
A l1-minimization Based Approach for Hyperspectral Data Classiﬁcation
Authors: Qazi Sami Ul Haq , Shi Li Xin , Tao Lin Mi , Yang Shi Qiang
Published: February 2012

Most of classiﬁcation methods require model learning procedure or optimal parameters selection using large number of training samples. In this paper, we propose a novel classiﬁcation approach using l1-minimization based sparse representation which does not need any learning procedure or parameters selection. The proposed approach is based on l1minimization because l0-minimization is generally NP-hard and is not a convex optimization problem. Sparse based solutions have been proposed in other areas like signal processing but to the best of our knowledge, this is the ﬁrst time that sparse based classiﬁcation is being proposed for the classiﬁcation of hyperspectral data. l1-minimization based sparse representation is calculated for each of the test samples using few training samples directly. In remote sensing, usually it is extremely difﬁcult and expensive to identify and label the samples due to which we often lack sufﬁcient training samples for classiﬁcation. We tested the proposed approach for difﬁcult classiﬁcation problem i.e high dimensional spaces and few training samples. We also analyzed the cases in which the sparse based classiﬁcation may and may not work. Our extensive experiments on real hyperspectral dataset (AVIRIS 1992 Indiana’s Indian Pines image), prove that the proposed technique offers more classiﬁcation accuracy and more efﬁcient than state-of-the-art SVM and semi-supervised methods as it does not need any model selection.
Classification of Airborne Lidar Data by Echo
Authors: Wang Sheng Yao , Cui Xi Min , Yuan De Bao , Jin Jing Jing , Zhang Qiang
Published: February 2012

With the continuous development of Airborne Lidar hardware, the current data collection system will not only collect information on a single echo, multiple echo information also can be available. Through the analysis and discussion of echo principle, this paper compares and elaborates the characteristics of single-echo and multiple echo information, and introduces a filter classification method based on echo information, and illustrates that the method is simple and effective according to an example.
Study on Modified Ceramic in Treatment of Micro-Polluted Source Water for Strengthening Filtration
Authors: Dai Yuan Yuan , Yuan Jian , Zhang Jing Ren , Wang Lian Wang
Published: February 2012

As filter media sand, ceramic has the certain removal effect in treating turbidity, organic matter from water .but the removal rate is limited. Modied filter could change filter surface characteristics. in this article, modied ceramic with aluminum hydroxide 。the experimental resulta showe that the trentment effect of ceramics filter coated aluminum is higher than ordinary ceramic in turbidity, CODMn, UV254 in the water, the removal efficacy is 96.64%，38.14%,47.77%respectively,aftercoated aluminum ceramic getting through the filter candle ,the Zeta potential of filter water is more close to zeto point and helpful for adhering to particles and intercepted. Conventional filtering process of water plant adopting quard sand ,ceramic so on media has low treatment tate in low turbidy , contaninging organic micro-polluted source watet .the reason that those media specific surface area is limited ,under neutral condition surface carries negative charge,absorption capacity is little.which affect impurities adhesion on filter materials[1],to make outlet water quality improved ,.people begin to seek economic,good treatment effect filter media,modified media has become a kind of new workmamship in rencent 10 years[2-6]. .Modified media could make ordinary media surface properties improve, enhance intercepting capability and absoption.now much study regard sand as carrier .and ferric chloride,ferric nitrate,aluminum oxide as modifier. adopt study of modified ceramic little,although ceramic has more porosity , aperture and specific sueface area,which formed internal surface area is smaller respectively .accoding to sanitary standard for drinking water ,ameliorating ceramic performance and advancing effluent is urgently to be solve daboutsubject. this study used aluminum hydroxide as modifier ,investigated coater aluminum ceramic filtering effect.
Determination Optimum SVMs Classifiers for Hyperspectral Imagery Based on Ant Colony Optimization
Authors: Samadzadegan Farhad , Hasani Hadiseh
Published: February 2012

Referring to robustness of SVMs in high dimensional space, they are reliable tools for classification of hyperspectral imagery. However their performance is directly affected by two aspects: parameter determination and optimum feature subset selection. According to capacity of population based meta-heuristic optimization algorithm such as Ant Colony Optimization (ACO), they can find optimum or near optimum solution in complex optimization problems. This paper evaluates the potential of Binary ACO (BACO) in parameter determination, feature selection and both of them simultaneously in SVMs based classification system for hyperspectral imagery. Obtained results in comparison with genetic algorithm show superiority of BACO.
The Conductive Composites Test Technology for the Reinforced Cushioned Formation
Authors: Wang Ren Zhe
Published: February 2012

The sensing technology based on sensitive conductive composites was used on the reinforced cushion in a coal mine silo foundation. The reinforced belt sensor made from sensitive conductive rubber’s composites was flexible and large deformation. It is the ideal test sensor for the low-modulus and large strain reinforce belt. The results show that the new type of sensor performance is stability and the test is good.
Hyperspectral Image Classification Based on Artificial Immune System
Authors: Samadzadegan Farhad , Namin Shahin Rahmatollahi , Rajabi Mohammad Ali
Published: February 2012

The high spectral dimensionality in hyperspectral images causes the reduction of accuracy for common statistical classification methods in these images. Hence the generation and implementation of more complicated methods have gained great importance in this field. One of these methods is the Artificial Immune Systems which is inspired by natural immune system. Despite its great potentiality, it is rarely utilized for spatial sciences and image classification. In this paper a supervised classification algorithm with the application of hyperspectral remote sensing images is proposed. In order to gain better insight into its capability, its accuracy is compared with Artificial Neural Network. The results show better image classification accuracy for the Artificial Immune method.
Field Spectroscopy Measurements over Asprokremmos Dam in Cyprus Intended for Water Quality Monitoring
Authors: Papoutsa Christiana , Hadjimitsis Diofantos G.
Published: February 2012

High concentrations of suspended particulate matter in reservoir waters directly affect the water treatment plants by occurring damages to the filters during the pretreatment. The objective of this project is to define the support that can be derived from the use of remote sensing techniques in order to determine the spatial variations of Total Suspended Solids (TSS) in Asprokremmos Dam in Paphos District in Cyprus. Such techniques have been successfully applied to the retrieval of TSS concentration and other water quality parameters in various geographical locations and environmental settings. This paper describes the results obtained by an existing running campaign in which in-situ spectroradiometric measurements and water sampling measurements of turbidity have been acquired at the study area. A GER-1500 field sperctro-radiometer equipped with a fibre optic probe is used to retrieve the spectral signatures of the Asprokremmos Dam and a portable turbidity meter is used for the determination of turbidity values. Ground-truth data based on the spectro-radiometric measurements were simulated to comply with the Landsat TM/ETM+ visible and infrared bands, so that identification of the ‘best-suited’ spectral region in which turbidity can be retrieved, was performed.
Aerosol Optical Thickness Retrieval Based on Hj-Ccd Supported by Modis Surface Reflectance Production
Authors: Sun Chang Kui , Sun Lin
Published: February 2012

For lack of short-wavelength-IR bands near 2.1μm, the operational capabilities of HJ-1A/B CCD in monitoring aerosols are limited overwhelmingly. To solve this problem, a new algorithm, using MODIS surface reflectance production (MOD09) to support HJ-1A/B CCD aerosol retrieval, is proposed. A model of determining HJ-1 A/B CCD surface reflectance at blue band using MODIS surface reflectance data based on the kernel-based BRDF model is proposed. Six different HJ-1A/B CCD images, which have a high-quality and cover almost all the areas in Beijing, are used to test the new method. The retrieved values are compared with the API of Beijing city. Both of them have a similar variation trend. Implementation of the algorithm has a great significance in promoting the operational running of monitoring aerosol
Verification of Chips Creating as an Indicator of Machinability in Turning of a New Steel X2cr12ni12motin
Authors: Gajdoš Mário , Berdis Andrej , Gecák Ján , Mičko Milan , Kurilovský Tadeaš
Published: February 2012

Precise and reliable information on the machinability of a material before it enters the machining process is a necessity, and hypotheses must be tested through verification of actual methods. This article presents conclusions of machinability tests on a new austenitic stainless steels X2Cr12Ni12MoTiN and describes appropriate parameters for the cutting zone during the process of turning. The content of this article also focuses on the analysis of selected basic indicators of steel machinability: quality of the processed surface. The results of the article are conclusions for working theory and practice for turning of austenitic stainless steels. Based on the cutting tests, cutting speeds of 80 to 200 m/min, feed rate of 0.05 to 0.2 mm and solid carbide insert WNMG 080404-NF.
Influence of F/P on Structure and Thermal Property of Phenolic Resin
Authors: Chen Zhi Qin , Zeng Wei Jun , Chen Yang Fei , Li Wen Kui , Liu Hong Bo
Published: February 2012

The influence of F/P on structure and thermal property of resin was studied. Six resins were synthesized with different molar ratios of F/P. These resins were cured by means of temperature and without catalyst. The characterization of the resin was done by Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA) and differential thermo gravimetric analysis (DTG). From the thermal properties of fully cured resins, characteristic properties including pyrolysis temperature and char yield were obtained. A maximum in the benzene ring substitutions, methylene bridge and the result of the thermal properties allow us to say that the resin with F/P molar ratio 1.2 has the highest crosslinking density and highest char yield, over 73%.
The Influence on the Physical and Mechanical Properties of the Tread by Preheating of Raw Rubber
Authors: Wang Chuang Sheng , Bai Feng Bao
Published: February 2012

This paper using synchronous rotor mixer, had researched the influence of preheating of raw rubber on the physical and mechanical properties of the tread under the same fill factor, rotor speed, cooling water temperature, and the pressure on top of bolt. According to processing and analysis of the experimental data, we can conclude that: As the temperature of raw rubber increased, the physical and mechanical properties of the tread had changed.
Characterization and Catalytic Activity of Fenton-Like Catalyst: Fe2O3/Attapulgite
Authors: Yu Shu Rong , Zhang Ting , Feng Hui Xia
Published: February 2012

Fe2O3/attapulgite(ATP) catalyst was successfully prepared for Fenton reaction to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. BET, SEM, FT-IR were performed to characterize Fe2O3/ ATP catalyst. Comparative studies indicated that the SDBS degradation ratios were much higher in presence of Fe2O3/ATP and H2O2 than those in presence of Fe2O3/ATP or H2O2 only, which suggested that the Fe2O3/ATP-catalyzed Fenton-like reaction governed the SDBS removal process. It also can be seen that Fe2O3/ATP-catalyzed Fenton-like reaction almost has the same efficiency as homogeneous Fenton reaction, while the former can be reused and has no secondary pollutants.
Thermal Conductivity and Thermal Mechanism of Octadecane from Molecular Dynamics Simulations
Authors: Li Qing Ling , Zheng Wen Juan , Wang Yan , Zhou Yan
Published: February 2012

The physical model of the octadecane in the paraffin is established by Material Studio software in this paper, thermal conductivity and micro-thermal mechanism of octadecane are simulated by program LAMMPS. Results show that: the thermal conductivity of octadecane is about , which has an increasing trend with enhancement of temperature; simultaneously it mainly relies on the molecular or atomic thermal vibration to transmit heat. When the octadecane has phase transition, reducing of thermal conductivity is due to the increasing of heat transfer resistance of solid-liquid contact interface.
Mechanical Behavior of the Rubber Blanket Used for Electrical Machine Hanging
Authors: Shan Ti Kun
Published: February 2012

In order to get optimal properties of rubber blanket used for electrical machine hanging, FEM calculation is used to conduct stress distribution of rubber blanket to detect its rubber mechanical behavior, normal temperature static rigidity and compression strength, and detect the relationship of applied load and distortion. Ultimately, the simulative results are verified feasibly and their operating requirements are satisfied.
Design of a Multi Microinjection Molding Module for Thermoplastic Polymer
Authors: Zhang Pan Pan , Wang Jian , Xie Peng Cheng , Miao Li Lei , Yang Wei Min
Published: February 2012

A new concept of microinjection molding module was designed and presented. The module was designed as a multi microinjection module, which is matched with a vertical injection molding machine (IMM) and can be applied to usual IMMs. A planetary gear pump was integrated in this module to complete the multi microinjection molding(MμIMM)。The module is fixed between the stationary platen and the mold of IMM. The plasticizing unit of the IMM provides the melt and initial pressure for the multi microinjection molding module. With this module, a usual IMM could be upgraded to a precise microinjection machine and has the capability of precise metering for the microinjection molding.
The Modular Design of Cold Feeding Rubber Extruders
Authors: Liu Xin Yue , Wang Zhi Qiang , Lv Bai Yuan
Published: February 2012

The conception of the modular design is introduced in design and manufacture of cold feeding rubber extruders; and the realization of process is expounded in details. It improves design efficiency and product quality significantly, and meets the needs of the time.
Numerical Simulation of Differential Injection Molding Based on Moldex 3D
Authors: Miao Li Lei , Xie Peng Cheng , Zhang Pan Pan , Yang Wei Min
Published: February 2012

Differential injection molding is one of the key technologies for micro-manufacture. The mechanism of melt pump based on the differential injection molding is presented. The differential injection molding system is added into the traditional injection machines. Melt is plasticized by the plastication system, then after being split, pressurized and measured by the differential system, it enters the cavity to realize the function of multiple micro injection molding machines. Moldex 3D software is used to simulate the filling history of the micro-structure via differential injection molding technology. The product's filling volume under different processing parameters is compared, which provides theoretical basis for the optimization of the molding parameters in differential injection molding technology.
Experimental Study of Relations between Synchronous Rotor Speed and Mixing Process
Authors: Zeng Xian Kui , An Shuai , Zhang De Wei , Wang Dong
Published: February 2012

Rotor speed is one of the most important technical characteristics of the internal mixer. The effects of rotor speed on mixing process have been studied. In the experiments, three types of synchronous rotors which were two-wing synchronous rotor, four-wing synchronous rotor and six-wing synchronous rotor were used. The experimental results indicated that there was a proper speed of different rotor structure for mixing process. And along with the increase of rotor speed, the maximum power, the unit consumption of energy and discharging temperature increase, while the physical and mechanical properties of mixed rubber got a better value.
Simulation of Micro-Gear Manufactured by Differential Injection Molding Based on Moldex 3D
Authors: Xie Peng Cheng , Miao Li Lei , Zhang Pan Pan , Yang Wei Min
Published: February 2012

In this article, the structure of the differential pump is introduced, which is the core part of the differential injection system. The micro-gear with a shaft collar is simulated as it is an important micro-part and has great potential application in mechanical transmission. The Moldex 3D simulation software is used to investigate effects of processing parameters on the micro-gear such as melt temperature, mold temperature, injection time and packing time etc. By comparing the micro-gear's warpage under different processing parameters, it can be concluded that melt temperature has a greater impact on the molding quality than mold temperature. In addition, the effects of injection time and packing time on the micro-gear's molding quality are also investigated.
Research on Spiral Engagement Cold Feeding Rubber Extruder
Authors: Liu Yao , Liu Xin Yue , Lv Bai Yuan
Published: February 2012

Through the experimental comparison of free feeding technology, roller feeding technology and spiral engagement feeding technology, it can be seen that the spiral engagement feeding technology has significantly increased production capacity, improved extrusion stability, reduced the energy consumption and does not hold shaft, not leak rubber, etc; at the same time, industrial application research on spiral engagement cold feeding extruder was carried out, as well as expanding its application research on this extruder with short fiber compound and environmental protection plate compound which is composed by waste plastic, rubber compound and waste oil. It proves that the work principle of spiral engagement cold feeding technology is feasible, also demonstrates that this extruder has a broad prospect of application.
Investigation on Brazing of Carbon Film Deposited Diamond for Cutting Vehicle Tyre
Authors: Ma Bo Jiang , Li Liang An , Yu Qing Xian
Published: February 2012

The super brazed diamond saw was developed to cut efficiently vehicle tyre in the research. The carbon film deposited diamond and the uncoated diamond were brazed with NiCr alloy by high-frequency induction heating under argon atmosphere at 1030°C for 30 seconds respectively. The interfacial microstructures between the brazed diamond and the filler alloy were analyzed by the advanced testing technologies. The results shows that long-lath carbides with the definite orientation and better flatness are closely arrayed on the brazed uncoated diamond surface and Cr-carbides forms normally and compactly on the surface of carbon film deposited diamond brazed. That is because the carbon film has changed the mechanism of Cr-carbides forming on the surface of diamond brazed. The test of cutting vehicle tyre shows that the use life of the brazed deposited diamond saw is much longer than that of the brazed uncoated diamond saw.
Synthesis and Characterization of Epothilone B Molecular Imprinted Polymers
Authors: Gong Guo Li , Jia Lin , Li Hui
Published: February 2012

Molecular imprinted polymers (MIPs) for antitumor drug Epothilone B have been synthesized with bulk polumerization in order to specifically extract this agent in the present study. MIP was prepared by thermal polymerisation using Epothilone B as template, methacrylic acid as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent. The best synthesis progenic solvent was ultimately determined when the bonding property of the polymer was studied. The selectivity of imprinted polymer on Epothilone B was also studied. The equilibrium binding experiments showed that the binding site of MIPs was heterogeneous with one binding site. Equilibrium dissociation constant was 3.37 mg/ml, the maximum apparent adsorption was 335 mg/g.
Numerical Simulation of Tire Steady-State Temperature Field Based on ANSYS Workbench
Authors: Li Jing , Wang Ze Peng , Liu Wen Xiu , Zhang Fa Hu
Published: February 2012

The three-dimensional axial symmetry FEA (finite-element analysis) model is established for 165/70R13 type tire based on ANSYS Workbench FEA software, and numerical simulation at temperature field is implemented, which reflects the temperature distribution at each part of tire intuitively, and has a certain guiding significance of improving tire structure and design.
Prediction Method of Main Parameters in Internal Mixer Based on Chaotic Neural Network
Authors: Huang Su Zhen , Wang Chuan Sheng
Published: February 2012

The chaotic mixing prediction model was established based on RBF neural network and the chaotic mixing process of internal mixing. Training process indicates the method has powerful approaching ability, classing ability and convergence. Actual experiment results verified validity and veracity of this method.
Numerical Simulation and Experimental Verification of Butterfly Porous Fences
Authors: Duan Zhen Ya , Dong Ying Ying , Zheng Fu Lin , Zhang Jun Mei
Published: February 2012

In this paper, the domestic and foreign research progress of numerical simulation on the porous fence is introduced briefly, and a numerical model is established to simulate the flow characteristics behind the butterfly porous fence through the FLUENT software. The comparison results found good agreement between the numerical model and wind tunnel experimental data with an error of 7.8% in the wind reduction ratio, indicating the present numerical model can be used to undertake study on butterfly and non-planar porous fences. The effect of porosity on the flow characteristics behind the butterfly porous fence have been evaluated using the present model to determine an optimum porosity for sheltering effect of an isolated porous fence. As a result, the butterfly porous fences with a range of porosity from 0.27 to 0.32 seem to have a better shelter effect among the studied porosities, and all the wind reduction ratios approach to 60%.
Analysis of Biomass Briquette Machine Ring Mold Length-Diameter Ratio of Finite Element Based on ANSYS
Authors: Liu Bing Cheng , Liang Xiao Ming , Guo Hong Yu
Published: February 2012

Nowadays, ring die, which is a key component in ring mouleded roll forming machine, is applied more in domestic. But it has a higher machine maintenance costs and lower efficienc, and its life becomes shorter under the conditions of high temperature and pressure. By comparing the different simulation length-diameter ratio of the stress field cloud maps, which are anlyzed by ANSYS software, the best length-diameter ratio was gotten in this paper.
Finite Element Analysis of Flow Field in Nano-Laminated Coextrusion Die
Authors: Shan Ti Kun , Li Chang Jin , Yang Wei Min , Li Shu Jiang
Published: February 2012

FEM analysis of flow field in nano-laminated coextrusion die is introduced. Nano-laminated coextrusion die is a new type of laminated composite generator which is based on the principle of the melt calculus. The distributions of pressure field and velocity vectors are obtained and analyzed. The result using finite element simulation software Polyflow shows an improvement in structure of die as well as better quality for melt flow characteristics. The paper is helpful in design and optimization of coextrusion die and process.
Effect of Post-Vulcanization on the Tire Curing Degree
Authors: Li Qing Ling , Chen Hai Long , Li Tao , Du Dong Xing
Published: February 2012

The optimum curing times for rubbers used at various parts of a tire are measured under different temperatures. The sulfurization reaction activation energies for various kinds of rubbers are obtained based on Arrhenius’ law and the equivalent tire curing time and curing degree are calculated with or without taking post-valcanization effect into consideration. It Is found the post-valcanization effect has significant effect on the rubber curing degree and therefore can not be ignored. Attentions have to be paid on the post-valcanization effect for quality and efficiency enhancement of tire production.
Analysis and Study on the Pulsed Solid-Plug Phase Pneumatic Conveying
Authors: Li Zhi Hua , Peng Zong Xiang , Li Zhou
Published: February 2012

Introduced the pneumatic conveying devices and conveying principles when conveying phase is about pulsed solid-plug, analyzed the flow action of solid-plug and the relationship between the conveying parameters while conveying, provided a reference for the correct design and use of this type of pneumatic conveying system.
A New Method for Recognizing Carton Black in Rubber Image
Authors: Wang Xiao Bo , Wang Chuang Sheng
Published: February 2012

It’s important to recognize carton black in rubber image for detecting carton black dispersion. This new method adopts special algorithm that depends on rubber image’s character to optimize background color of rubber image and make carton black clearer. In addition, this method can distinguish some abnormal factors through calculating oblate degree of white region. Application of this new method is useful for getting exact information of carton black and supplying correct data for evaluating carton black dispersion.
Research on the Rheology of Polymer Latex Modified Cement Paste Containing Mineral Admixtures
Authors: Xu Fang , Zhou Ming Kai , Chen Jian Ping
Published: February 2012

The rheology of styrene-butadiene rubber (SBR) polymer latex modified cement paste (SMCP) was studied in this paper. The effects of mineral admixtures (MAs) on the rheological performance of SMCP were studied using the Brookfield R/S Plus rheometer. The results indicate that the plastic viscosity of SMCP with different shear rate all decreases as the test time extends. As the shear rate increases, the plastic viscosity reduces significantly. The rheology of SMCP improves as the SBR latex content gradually increases. With increasing quantities of fly ash (FA), the yield stress of SMCP gradually increases and the plastic viscosity also increases to a certain extent. However, with a gradual increase in the granulated blast-furnace slag (GBFS) content, the yield stress and plastic viscosity of the SMCP decrease unobviously
Application of SMA on the Alloy of Nylon6/ABS
Authors: Wang Chao , Li Ying Chun , Yao Zhen Xing
Published: February 2012

The alloy of Nylon6/Acrylonitrile-Butadiene-Styrene (ABS) with styrene-maleic anhydride (SMA) was prepared by melt blending as the compatilizer. Mechanical characteristics, dynamic mechanical analysis (DMA) and fracture appearances were determined. It was found that the impact and tensile strength firstly increased and then decreased along with the increase of the SMA content. The properties reached maximum values when the content of SMA was 2%. The results of DMA and scanning electron microscope (SEM) indicated that the addition of SMA can effectively enhance the compatibility of Nylon6 and ABS.
Composition Analysis of Spooling Tension about Automatic Winder
Authors: Wang Jiang Zhong , Chang De Gong
Published: February 2012

The spooling tension of the automatic winder is the critical factor influencing on the quality of the finished textile. The satisfying creel package depends on the constant spooling tension. However, the complex spooling tension is subjected to many factors, such as the unwinding tension, additional tension and yarn guide tension. In this paper, the composition of the spooling tension was studied theoretically and the main factors giving rise to the tension fluctuations were obtained. The gained results could be applied to controlling the tension fluctuations of the winder.
The Study on the Preparation and Properties of PPO/PA66 Alloy with a New Type of Compatibtlizer B
Authors: Zhang Ya Tong , Li Ying , Li Li , Qu Xiong Wei
Published: February 2012

By blending homemade compatibilizer with carboxylic acid functional groups into the basic materials of PPO and PA66, through twin-screw extruder blending, the PPO/PA66 alloy was prepared. The micromorphological and mechanical properties of PPO/PA66 blends with different contents of the compatibilizer were studied by transmission electron microscope （TEM）, scanning electron microscope （SEM）, mechanical test and Molau test. The results showed that the homemade compatibilizer can improve the mechanical property. Besides showing good effect on the compatibility improvement for PPO/PA blends，it has an in-situ compatibilization for the PPO/PA66 alloy
Simulation and Ergonomics Approach for Service & Manufacturing Process Improvement
Authors: Sánchez-Lite A. , García-García M.
Published: February 2012

The human factor is a key variable in the efficiency of the product-process development system. The ability to be able to predict the influence of this factor in the process is a significant challenge in manufacturing engineering, as well as the consequences that the process designed has on this factor. All ergonomic considerations have traditionally been evaluated without using 3D product design. Nowadays, 3D process design technologies and simulation tools allow us the opportunity from the earliest stages of the design process. They can also be used to improve current processes in order to increase human comfort, productivity and safety. This paper describes a methodology using 3D design and simulation tools to improve industrial and service processes. This methodology has as an objective the detection, evaluation and control of work-related musculoskeletal disorders (WMSDs).
Vibration Characteristic Analysis of V-Shaped Electrothermal Microactuator
Authors: Wang Zhen Lu , Shen Xue Jin , Zhou Ling , Chen Xiao Yang
Published: February 2012

This paper is focused on the finite element analysis (FEA) and theoretical calculation of vibration characterization of V-shaped electrothermal microactuator. A vibration mechanical model about V-shaped electrothermal microactuator is presented. By having a comparison between FEA and theoretical calculation about natural frequencies of V-shaped electrothermal microactuator, the maximum error is within 0.19 %. This paper also analyzes the influences of microactuator geometric parameters on natural frequency. The length and thickness have larger effect on the natural frequency of the actuator, while the angle and width have less effect on the natural frequency.
Research of Coupling Structure between Photonic Crystal Waveguide and Dielectric Taper Waveguide
Authors: Ren Xiao Yuan , Feng Li Shuang , Zhou Zhen , Yu Huai Yong , Deng Xue Wen
Published: February 2012

There are two types of coupling structures for the photonic crystal of triangular array of air holes. The two types of coupling structure between dielectric taper waveguide(DTW) and photonic crystal waveguide(PCW) is investigated. The coupling transmission efficiency is calculated for different coupling structure of the input and output, we found that the coupling transmission efficiency is changed with different coupling width and distance. The highest transmission efficiency is 92.6% and 99.6% for the input and output port respectively.
Closed-Loop Driving Circuit Based on Frequency Modulation Method for Capacitive Micromachined Gyroscope
Authors: Mo Bing , Zheng Qi , Chen Si Hao , Zhou Huo , Ling Chao Dong
Published: February 2012

Closed-loop driving circuit is widely used in the high performance micrimachined gyroscope. But in the capacitive micromachined gyroscope, this circuit can be self-oscillation incapability because of signal coupling by parasitical capacitance. A novel closed-loop driving circuit based on the frequency modulation method is present in this paper. Since the frequency of driving signal is modulated, it is different from the frequency of sensing current. Even if there is coupling, the phase requirement of closed-loop driving method is not destroyed, which overcomes the disadvantage of self-oscillation incapability. Both the simulations and test results are provided, which demonstrates the feasibility of this method.
Closed-Loop Control of a SOI-MEMS Resonant Accelerometer with Electromagnetic Excitation
Authors: Shang Yan Long , Wang Jun Bo , Chen De Yong , Shi Qiang , Li Guang Bei
Published: February 2012

A closed-loop control system designed for a SOI-MEMS resonant accelerometer is proposed in this paper. The sensor chip was developed by silicon-direct-bonding SOI wafer (10+2+290 um) with MEMS fabrication technology. Z-axis acceleration is differentially detected by using two H-style vibrating beams through a frequency shift caused by the inertial force acting as bending stress loading. The electromagnetically excitation and detection is adopted to make the closed-loop control of the sensor easier. The whole closed-loop control system designed for the accelerometer mainly consists of amplifier, automatic gain control (AGC) circuit, buffer and phase shifter. Testing results show that the accelerometer with the closed-loop system can work stable at the frequency of 58.958 kHz when 1g z-axis acceleration is applied which is consistent with the open-loop testing.
A Novel Micro Mirror Spectrometer and Test Experiment
Authors: Luo Biao , Wen Zhi Yu , Liu Hai Tao , Chen Li , Qian Rong Rong
Published: February 2012

In order to realize more compact and in particular cost-effective spectrometers MOEMS technology offers attractive possibilities. Based Littrow spectrometer structure for the near-IR, a micro mirror grating spectrometer has been designed and developed. The ZEMAX was used for designed this structure. The resolution of this design is 10nm, the spectral range from 900nm to 1400nm. A scanning micro mirror is the key element of this IR spectrometer set-up. This micro mirror is driven by electromagnetic force. Before fix the micro mirror, it was calibrated. Meanwhile, for reducing the cost of this system, the silicon silt was designed and fabricated. For resolution testing of this spectral system, we used one light correction filters finished this experiment. The test result has shown the resolution of this spectrometer is16.8nm. Finally, the relation between the spectral line scanning characteristic and wavelength spectral resolution was discussed.
Emulated Analysis of the Preview-LQG Controller for Micromachined Tunneling Gyroscope
Authors: Liu Yi Fang , Wang Ling Yun , Wu De Zhi , Sun Dao Heng
Published: February 2012

Only when the tunneling gap is maintained near 10Å can the micromachined tunneling gyroscope operate regularly to generate tunneling current which is so weak that it would be submerged by the thermal-mechanical noise, 1/f tunneling noise and so on. At the meantime, the dynamic range of the device will be reduced drastically by the nonlinearity of the tunneling effect. So a controller must be designed for the miniature tunneling gyroscope to realize a 10 Å tunneling gap to decrease the nonlinearity and so as to enlarge the band-width of the device. At the other hand, the signal-to-noise ratio can be raised by the controller. Because of the anti-interference and robusticity of the LQG control theory and the time-varying characteristic of Coriolis acceleration, the preview-LQG control strategy is selected to design the closed-loop system. The simulation results suggest that the tunneling gap can be controlled near its nominal value and the measured input angular rate can be estimated accurately by the preview-LQG controller even if the input angular rate is a slowly time-varying random signal.
Investigation of Silicon Lapping and Polishing Technique for Micro-Inertial Device
Authors: Long Zhang , Jian Zhu
Published: February 2012

The precision lapping and polishing Si wafer is presented. Three-step lapping Si wafer and two-step polishing Si wafer are adopted within this processing. The Al2O3 abrasive of 20μm, 9μm and 3μm is used to lap wafer, then precision polishing is done with lapping agent of CeO2 and SF1. The thickness of the Si wafer can be controlled accurately, the flatness can be controlled within 3μm, and the roughness can be controlled under 1nm. The stress can be decreased evidently, even the thickness of the Si wafer is thinned down to 60μm, it is still flat.
New Isolation Optimization Method of RF MEMS Capacitive Switches
Authors: Chen Jun Shou , You Zheng , Ruan Yong , Hu Mu Zhi
Published: February 2012

A new isolation optimization method of radio frequency (RF) microelectromechanical systems (MEMS) capacitive switches is carried out in this paper. We simplified the coplanar waveguide and the top movable electrode as two-port network. The existence of the maximum isolation of single switch is proved theoretically based on circuit model and S-parameters model. The isolation of the distributed switches with lossless transfer lines, which is the function of the transfer lines length and the impedance of metal beams, is described by mathematic expressions and simulated in a numerical method. We find that the isolation varies periodically with θ and f, which are the electrical length between metal beams of the distributed switches and the signal frequency. It achieves the maximum value 83dB at θ=π/2 for 2-beams switch. However, different from single beam switches, the distributed switches maximum isolation is near but not precisely at the resonance frequency f0. The bandwidth of RF signal can be widened to about 200% for 5-beams switch by using the proposed design method. The results will be useful for Resistance-Inductance- Capacitance parameters optimization of RF MEMS Capacitive switches.
Boron-Doped Nanocrystalline Silicon Thin Films Prepared by PECVD
Authors: Wang Xiu Qin , Ding Jian Ning , Yuan Ning Yi , Wang Shu Bo
Published: February 2012

Boron-doped nanocrystalline silicon thin films(p-nc-Si:H) were deposited on glass substrates by plasma enhanced chemical vapour deposition (PECVD) using SiH4/ H2/ B2H6. The effects of substrate temperature, rf power and diborane flow on the microstructure, the electrical properties of nanocrystalline silicon thin films have been investigated. The results show that, increasing substrate temperature, rf power and B2H6flow can improve the conductivity of P-Si thin film. However, exceeding one value, they are not advantageous to improve the conductivity due to the decrystallization of films. Hence, appropriate process conditions are crucial for the preparation of high quality p layer. crystalline volume fraction (Xc) 26.2 %, mean grain size (d) 3.5nm and conductivity 0.374S/cm, p-nc-Si:H thin film was deposited.
Design and Realization of Modular MEMS-Based Attitude Measurement and Control System Based Wireless Sensor Networks
Authors: Liu Shao Peng , Zhou Zhao Ying , Yang Xing , Liu Qiu Sheng , Wang Qiong , Guo Qi
Published: February 2012

The Modular Platform System in this Paper Consists of a Series of Modularized MEMS Subsystems, Including Central Control Unit, MEMS Attitude Measurement Unit, Environment Unit, Flight Measurement and Control Unit, Time Control Unit, Impact Vibration Measurement Unit and other Auxiliary Modular Units. the Key of the System Is the MEMS Attitude Measurement Unit, which Can Resolve the Real Time Attitude Information of the Carrier. the System Platform Chooses Different Sensors and Units According to Various Circumstances and Implements Data Collection, Fusion and Solution through the Central Processing Module. by Means of Carrying Distinct Units, System Platform Can Constitute many Measurement Control Systems, such as Micro Wireless Attitude Determination System, MAV Flight Data Recorder, MAV Flight Control System and PHM (prognostic and Health Management). with Application of MEMS, the System in this Paper Is High-Efficient, Low-Weighted, Simple-Structured, High-Reliable and even Can Respond in a Short Time. in View of these Merits, the System Can Be Applied in many Kinds of Attitude Measurement and Control System.