bluuebunny/crossref_metadata_2025 huggingface dataset:
Hardware Design of Code Transmitter and Monitor Station
Authors: Chen Hui Ning
Published: September 2013

The wireless transceiver and monitor station own the same structure. The wireless transceiver is mainly composed of high-powered, embed wireless module PTR8000, which implants complete communication protocol and CRC. PTR8000 communicates with MPU fleetly exactly by serial port.
Research on Marine Radar Image Collection Technology Based on OpenCV
Authors: Chen Duo , Li Ying , Wang Yi Wen , Xu Jin
Published: September 2013

Marine radar image collection technology has been applied in many fileds. It has been a research focus at home and abroad for a long time. This paper proposes an architecture of marine radar image collection system based on Sperry radar, HPX Rader Information Board, OpenCV, SPX Function Library. And implementation of key technologies was diccussed from three aspects, includ-ing radar image display, collection and clear functions. This system has worked well in practice.
Study on Dynamics of Small Tracked Steering on Ramp
Authors: Chen Jian Hua , Mu Xi Hui , Du Feng Po , Lv Kai
Published: September 2013

This vehicle is mainly used for transportation of materials at a short distance in a variety of harsh terrain, such as mountains, ravines, jungles, deserts, beaches, snow-covered environment. Steering on ramp is a common working condition for this vehicle. For the restriction of the tracked vehicles size and internal space of chassis, the selected power of engine is always small. Therefore it is necessary to study on the tracked vehicle steering performance on ramp and to calculate traction and braking force of the inner and outer crawler required, which has practical significance for the further study on the vehicles dynamics research and power matching.
Study on Accurate Measurement Technology for Microscopic Image
Authors: Xu Pei Long
Published: September 2013

In this study the accurate calibration technique of microscopic image was studied. A set of method which could accurately calibrate the microscopic images was established through construction of mathematic models for Lens distortion correction, binaryzation, and edge extraction etc. Experiments results indicates that, this method owns characteristics of small error, high recognition rate, fast calculation speed, and could finish calibration of microscopic images relatively accurately.
Chaos Synchronization of the Modified Sprott E System
Authors: Yang Xiao Ya
Published: September 2013

In this paper, chaos synchronization of the modified Sprott E system is investigated. Firstly, the chaotic attractors on different phase planes of the system are got by means of numerical simulation. When , the abundance dynamical behavior of the system is presented by the global bifurcation graph. Then, the chaos synchronization of the system by the full state hybrid projective synchronization (FSHPS) method is realized.
Volume-Based Data Representation of Big Data Analysis
Authors: Xu Qian , Zhao Zheng Xu , Wang Wei
Published: September 2013

Over the past decade, Big Data has been becoming a great research hotspot because of continuous implementation of advanced techniques, burgeoning interdisciplinary cooperation and varying user requirements. Because of its well-known four V-characters, the associated applications always suffer from low efficiency and hard to manage. Our research summarized the common issues of Big Data-based applications, and set improving data formatting and representation performances as the research objectives. In this paper, a novel data presentation strategy was built via devising volume-based representation to facilitate complicated processing work and overcome limitations of data manipulation tasks. For improving information processing efficiency, this design served as a data carrier which enables flexible implementations of data processing algorithms. Besides, its inherent spatial information not only supports direct operations, but shows the feasibility of information integration in the future work.
Speech Coding Algorithm with Dynamic Weighted Inter-Frame Linear Prediction
Authors: Su Zhao An , Xiu Chun Di
Published: September 2013

A new multi-frame joint quantization algorithm with dynamic weighted inter-frame linear prediction based on mixed excitation linear prediction (MELP) is proposed in this paper. In encoding stage, a super-frame consists of three adjacent single-frames. Fourier magnitudes and aperiodic jitter flag are eliminated. The other parameters are jointly quantized. LSF of the first and third frame are quantized as a 20-dimensional vector. According to the BPVs of super-frame, pitch is quantized with codebooks of dynamic size. In decoding stage, parameters are indexed from corresponding codebook. The LSF of middle frame are predicted from the first and third frame. The weighted factors keep changing in accordance with the BPVs of adjacent five frames. Results show that the reconstruction accuracy of LSF is significantly improved using dynamic weighted inter-frame linear prediction. Meanwhile the coding bit rate is reduced to 0.6 kbps.
The Acquisition Research of the Geological Data Based on Data Fitting and Precision Analysis
Authors: Qi Xiu Li , He Ji Xian , Xie Wen Bin , Qiu Guo Qin , Liu Nan
Published: September 2013

Because of the different types and function of the Underground engineering, a large number of geological drilling in construction area cost high, and will cause unnecessary security hidden danger in later construction. In consideration of the accuracy of other existing geological survey equipment is so poor that can not meet the data requirements of geological modeling, In this paper, we select a combination method between high density resistivity survey data and drilling data of Geological information access and data fitting, through the error analysis of the results, Two classes of data fitting equation are obtained, and through this method, the accuracy of the data of geological modeling are effectively corrected.
On the Perron Root of Nonnegative Matrices
Authors: Li Hong Yi , Zhao Di , Wang Chao Jie
Published: September 2013

In this paper, we mainly discuss the computation of the Perron root of a nonnegative matrix. We propose an algorithm for the Perron root of nonnegative matrices by using the generalized Perron complement. Based on this algorithm, for the Perron root of a nonnegative matrix with central symmetric structure, we construct an improved algorithm, which ensures significant saving of computation and store cost. We demonstrate this by analyzing theoretically and a numerical example.
Comprehensive Face Location Algorithm Based on Composite Skin Color
Authors: Wen Chang Bao , Sun Wen Zheng , Cheng Hong Liang
Published: September 2013

In order to solve the slowly processing speed, low precision problems in the Face location and detection, the comprehensive face location algorithm based on composite skin color was proposed in this paper. The YCrCb model algorithm and HSV model algorithm are skillfully applied to the comprehensive face location algorithm. The human body region and background region can be detected and judged by the color value of every pixel for image in the YCrCb and HSV space. Then, the connecting region can be screened and decided by the geometric features of human face, and the face can be accurately located and detected. The experimental results confirm that the algorithm can achieve the accuracy ratio of face location in three cases, such as simple, medium and complexity, are 99%, 92% and 85%, respectively. Furthermore, the accuracy ratio of face location and detection speed was improved in this algorithm.
Catastrophic Risk, the Disequilibrium of Agricultural Insurance Markets and Reinsurance - Based on the Data from Hubei
Authors: Xing Hui Ru , Tao Jiang Ping , Zhao Wei
Published: September 2013

Catastrophic risk existing objectively in agricultural production is the main cause for the imbalance of the agricultural insurance markets, and to promote the sustainable development of the agricultural insurance, it is necessary to improve the agricultural insurance risk transfer mechanisms. Under the condition of farms and insurance companies expected utility maximum, we develop an agricultural insurance market equilibrium model based on the M-V preference function, and then demonstrate that catastrophic risk leads to the imbalance in the agricultural insurance market. Insurance companies involved in reinsurance arrangements helps rectify the imbalances in agricultural insurance market. Based on this analysis we verify the development of Hubeis agricultural insurance market, and then simulate the reinsurance arrangement of Hubei agricultural insurance. The theoretic and empirical analysis has an implication for the design of agricultural insurance catastrophe risk transfer tools.
Influence of Modeling Methods for Housing Price Forecasting
Authors: Yang Xiao Li , He Qiong
Published: September 2013

In this work, we estimate Yunnan housing price from 1999 to 2009. Firstly, we analyze the correlation coefficients between housing price and characteristic variables, identify the characteristic variables. Then, we build the forecasting model using four techniques, support vector regression (SVR), radial basis function neural network (RBFNN), partial least square (PLS) and multiple regression analysis (MRA), based on whole variables and characteristic variables. The results show that PLS technique is the best one for housing price forecasting. Its mean absolute percentage error (MAPE) is only 2.45%. SVR and RBFNN are better techniques to obtain a satisfactory forecasting result with almost 5% MAPE. Furthermore, the performance of MRA and SVR can be obviously improved through variables selection.
The Mining and Developing Research for BOP Market
Authors: Wang Li Ping , Hu Xue Jie
Published: September 2013

Since The Bottom of Pyramid Strategy has been put forward, enterprises began to pay close attention to this untapped market with potential. But how to dig the potential of BOP market, design the product that BOP groups really need, and open the BOP market, are problems that should be solved. This paper discussed the mechanism of mining and developing the BOP market with the orientation of value. The results of the study is that the mining and developing of BOP market is essentially the process that enterprises found value, put forward the value proposition, reconstruct the value network ,create value , deliver value and realize value.
The Analysis of Research Hotspot of Chinese Cultural and Creative Industry - Based on Co-Words Method
Authors: Fan Zhi Guo , Zheng Wen Long
Published: September 2013

Based on the journal resource from the cqvip database, taking "cultural and creative industry" as the keyword, the paper retrieved all the relevant "CSSCI" documents from 1989 to 2012. After getting the keywords co-occurrence matrix through BIBCOMB software, the paper focused on the keywords analysis which was obtained by the software UCINET and NETDRAW. Then it comes to the conclusion, which shows that development countermeasures, cultural area, cultural creativity and influential factors are the hotspots in present research.
Performance Analysis of the Domestic and Imported Portable SO2 Gas Analyzers for Stationary Pollution Source
Authors: Wang Qiang , Zhong Qi , Zhou Gang , Zhang Yang , Yang Kai
Published: September 2013

As an air pollutant, the emission and monitoring of SO2 gas have been widely concerned. In the paper, the characteristics of domestic and imported portable SO2 gas analyzers based on nondispersive infrared (NDIR) absorption technique have been tested. The performance of the analyzers has been discussed detailedly. The results reveal that domestic portable SO2 gas analyzer can provide excellent performance like imported instrument. In additon, all the analyzers have been in comparison with the continuous emission monitoring system (CEMS) for monitoring the SO2 emission of a power plant. The results demonstrate that domestic portable SO2 gas analyzers can be used to evaluate and supervise CEMS operating situation. Based on the comparison results and domestic demand, we also give some suggestion for the future technique research and instrument development.
Study on Ultrasonic Measurement for Non-Uniform Stress Field
Authors: Xiao Wang , Tao Chun Hu , Shi Yi Wei , Jing Liang , He Fang Cheng
Published: September 2013

Acoustic principle of ultrasonic measurement for stress field was introduced briefly. Longitudinal critically refracted (Lcr) wave was applied to study a non-uniform stress field in high strength 7050-T7451 aluminum alloy. Error sources of testing were investigated as well. The results indicate that ultrasound can be conveniently used to characterize non-uniform stress field with sufficient accuracy but without destruction. The measuring results represent mean stress existing in propagation path of ultrasonic. Stress field mapped by ultrasound has good coincidence with actual stress field. Temperature and coupling are main error sources of testing. As long as temperature maintains invariable, it is easy to characterize stresses with error less than 40 MPa even in different coupling condition and with other artifical variable. The measurement error induced by coupling was tolerable and reduced with increasing stress. This technique will provide a non-destructive method to measure residual stress in structures.
SVM Based Seismic Fragility Analysis for RC Isolated Continuous Girder Bridge
Authors: Long Xiao Hong , Chen Bei Lei , Li Jian Jun
Published: September 2013

Because the fragility analysis methods used in recent years have some disadvantages to some extent, and there is no relative research report on the seismic fragility of structures based on SVM algorithm, nonparametric analytical method is used in the probabilistic seismic demand analysis, and fragility curves of RC isolated continuous bridge are obtained based on SVM Method. It turns out that the analytical results of SVM Method and Cloud Method are different in the longitudinal direction, matched in the lateral direction, and the results of the former method are greater than the latter one. It is a new and meaningful research that is more efficient than IDA method and also reliable.
A New Type of Self-Assembled Fluorescent Chemosensor
Authors: Zhang Zhi , Hu Xiao Jun , Feng Jing , Niu Li Bin
Published: September 2013

According to the principle of dynamic quenching a new ON-OFF fluorescent chemosensor for Cu2+ ions was designed, this chemosensor was composed of sodium dodecyl benzene sulfonate (SDBS), p-tert-butylthiacalix[4]arene (TCA) and perylene through the form of self-assembly in aqueous solution. Addition of Cu2+ ions could result in a quenching of the fluorescence emission of perylene inside micelles, which is ascribed to intramicellar complex-fluorophore electron-transfer or energy-transfer effects induced by the complexation of TCA with the Cu2+ ions.The results of the experiment indicated that: With the condition of TCA/perylene = 1000/1, SDBS concentration was 50mmol/L and pH value above 7, concentration of Cu2+ ion can be linearly determined according to the fluorescence quenching in a certain range.
Free-Template Synthesis of Cu2O Nanocubes via Hydrothermal Route
Authors: Dang Rui , He Xin You , Liu Yong Song
Published: September 2013

Cubic Cu2O nanoparticles were synthesized via hydrothermal route without template. The study of different reaction conditions reveals that the concentrate of NaOH affects the size and the morphology of nanocubes.
Study on Application of Artificial Sand in Ready-Mixed Concrete
Authors: Zhou Jian Mei
Published: September 2013

Artificial sand can be obtained by mixing washed sand formed from the the poor quality of natural sand with high clay content and stone powder formed from processing and screening production by appropriate ratio, Which be applied to C20~C35 ready-mixed concrete. By studying the effect the artificial sand on the properties of fresh concrete and concrete after hardening, the result showed that artificial sand substitute for natural sand as ready-mixed concrete fine aggregate is entirely feasible. Key words: Artificial sand, Ready-mixed concrete, Property
Degradation of Polyacrylamide: A Review
Authors: Yi Luo , Li Ke Zhi , Liu De Xin
Published: September 2013

Water-soluble polyacrylamide is commercially available in different domains of industry, such as water purified, paper making, pharmacy, agriculture and oil exploitation. Especially polyacrylamide is used for polymer displacement, which can enhance oil recovery through increasing the sweeping efficiency. Good economic effects are achieved by the industrial application of polymer in various oil fields. However, some problems of the oil-well production and the waste water treatment come forth with the present of polyacrylamide in the production fluid. It is maybe an efficient mean to solve it with the degradation of polyacrylamide. So, this paper reviews the lately development on the research of the degradation of polyacrylamide, especially including ultrasonic degradation, thermal degradation, biodegradation and chemical degradation.
The π Bond of C2H4 and 2HX(X=F,Cl,Br,I) Interaction
Authors: Yang Jie
Published: September 2013

We applied ab initio theoretical studies on the complex of C2H4 and 2HX,the results demonstrated that C2H4???2HX(X=F,Cl,Br,I),with increasing halogen atomic number,from HF to HI,the bond length have all increasing,however,the binding energy of complex present in the overall decreasing trend.The π bond C2H4 molecule at least interacting with 2HX(X=F,Cl,Br,I) to formation of the X-H???π bond complex.
Study on Adhering Technology of Silicone Foam Surface
Authors: Wu Ju Ying , Fan Jing Hui , Huang Yu Hong , Kai Zhang , Fang He
Published: September 2013

Several purpose-designed adhering ways have been used for silicone adhesive adhering on silicone foam surface. The stress-strain and relaxing properties of the adhered and non-adhered silicone foam have been tested. By contrasting the effect of each adhering way to the silicone foams property and considering each adhered silicone foams SEM profile photo we found out the better adhering way C for silicone foam adhered by silicone adhesive. This adhering way C has small transmissibility, good compatibility, and little effect to the silicone foams property, so it can fit silicone foams applying demand.
Preparation and Photocatalytic Activity of TiO2/Tourmaline Composite Catalyst
Authors: Liu Wei Chao , Xu Huan Yan , Shi Tian Nuo , Wu Li Cheng , Li Ping
Published: September 2013

TiO2/tourmaline composite photocatalyst was prepared by sol-gel method using tetrabutyl orthotitanate (Ti (OC4H9)4) as a precursor. As a comparison, pure TiO2 was prepared at the same experimental conditons without the addition of tourmaline. The obtained composite photocatalyst was characterized by X-Ray diffraction (XRD) and scanning electron microscope (SEM) and its photocatalytic activity was also investigated through the photodiscoloration of methyl orange (MO) under UV irradiation. The XRD results indicated that, in the composite photocatalyst, TiO2 existed in the form of anatase and rutile, with the sintering temperature and tourmaline content increasing, the anatase phase trended to the transformation to rutile phase. The SEM results revealed that the nanosized particles of TiO2 were well dispersed and immobilized on the surface of tourmaline, especially for the sample with 2% tourmaline content. Compared with pure TiO2, the composite photocatalyst exhibited a higher photocatalytic activity. When the pure TiO2 was used as the photocatalyst, the MO discoloration ratio only reached 55%. However, the MO discoloration ratio could approach 100% in presence of TiO2/tourmaline composit photocatalyst under the same conditions. The effects of tourmaline content and sintering temperature on the photocatalytic activity of the composite were studied in this work and the results suggested that the sample with 2% tourmaline content and sintered at the temperature of 550°C exhibited the best photocatalytic activity. Finally, the possible mechanism for the photodiscoloration of MO was put forward.
Based on Molecular Distillation Waste Organic Matter Reduction Processing Technology Research
Authors: Fu Zhong Jun , Song Feng , Yu Lu Shan , Sun Run
Published: September 2013

In this paper, the current hazardous waste disposal methods of heavy organic matter were reviewed and the craft process of molecular distillation technology on distillation residue, recycling and reduction of heavy and dangerous waste organic matter were analyzed. The yield and the influence on product viscosity of molecular distillation separation heavy resid under different technology conditions were studied and the results showed that the technology conditions of molecular distillation separation heavy resid is residual pressure 10 pa, temperature 250 oC, blown film machine speed 230 r/min. the properties of the oil distillated met the national standard of wax oil. The goals of using molecular distillation recycling waste organic matter and heavy resource waste reduction were achieved.
Effects of Solid Solution Treatment and Rolling Treatment on Electrochemical Properties of Al Anode Alloy
Authors: Li Deng Hui , Wen Jiu Ba , He Jun Guang
Published: September 2013

Effects of solid solution treatment and rolling treatment on microstructure and electrochemical properties of Al-Ga-Mg-Mn-Bi anode alloy were investigated by means of SEM and electrochemical measurements. The results show that after solid solution treatment the microstructure segregation of the as-cast alloy was reduced, the hydrogen evolution was restrained, the corrosion resistance was increased. The open circuit potential moves towards negative after solid solution treatment. Rolling treatment had little impact on the alloy. The effects of solid solution treatment were superior to rolling treatment.
Thermo-Gravimetric Analysis and Kinetic Study of Biomass Pyrolysis
Authors: Fan Yong Sheng , Li Xiao Hua , Cai Yi Xi , Zhao Wei Dong , Yin Hai Yun
Published: September 2013

In order to realize the optimization of pyrolysis process, the pyrolysis characteristics and kinetics of common agriculture and forestry biomass were studied. Four kinds of biomass were chosen as experiment materials for thermo-gravimetric experiment. The Characteristics of biomass pyrolysis was studied by defining a new evaluation methodology. The method of Coats-Redfern was used to analyze pyrolysis kinetics of biomass pyrolysis process. The results of research show that the pyrolysis process of biomass can be divided into three stages, including drying and preheating, fast pyrolysis and slow decomposition of residue. The activation energy of pyrolysis reaction of biomass during the low temperature stage is higher than that of the high temperature stage. The values of the activation energy and pre-exponential factor are increasing with the increase of heating rate. The pyrolysis of biomass in the main pyrolysis zone can be effectively described by using the kinetic model n=2. The heating rate of 15K/min and temperature of 500°C can improve the reaction rate, and it helps to reduce energy consumption of the reaction.
Kinetic Investigation of Thermal Decomposition Reactions of 4'-Demethypodophyllotoxin and Podophyllotoxin
Authors: Wen Pu Hong
Published: September 2013

The thermal behavior and thermal decomposition kinetic parameters of podophyllotoxin (PPT) and 4-demethypodophyllotoxin (DMPPT) in a temperature-programmed mode have been investigated by means of DSC and TG-DTG. The kinetic model functions in differential and integral forms of the thermal decomposition reactions mentioned above for leading stage were established. The kinetic parameters of the apparent activation energy Ea and per-exponential factor A were obtained from analysis of the TG-DTG curves by integral and differential methods. The most probable kinetic model function of both decomposition reactions in differential form was (1-α) 2. The values of Ea indicated that the reactivity of PPT was higher than that of DMPPT in the thermal decomposition reaction. The values of the entropy of activation ΔS≠, enthalpy of activation ΔH≠ and free energy of activation ΔG≠ of the reactions were estimated.
Solar Biogas Digester and Wetland-Pond System for Rural Wastewater Treatment
Authors: Zhu Xiang Hong , Zhong Chong , Jiang Zeng Bin
Published: September 2013

Solar biogas digester and wetland-pond system treated the wastewater for the rural about 60 families. The system comprised a solar anaerobic baffle digester, an anaerobic filter, a subsurface vertical flow wetland, and an eco pond. The four units were connected in series. The solar digester and the filter produced enough biogas evenly in whole year and provided 80-91% total suspended solids (TSS) removal. The wetland-pond developed aquatic crops, fisheries and waterfowl aquaculture. In this artificial ecosystem, bacterial oxidization, algae photosynthesis and food web degradation greatly reduced COD, BOD5, TN, NH4-N, TP, and pH of water.
Review on the Unbroken Three-Dimensional Network Modification Methods of Waste Rubber Powder
Authors: Liao Xiao Xue , Liao Shuang Quan , Zhao Yan Fang , Luo Ming Chao , Tian Wei Min
Published: September 2013

Waste rubber powder (WRP) is global concern, with the development of rubber industry. However, WRP with three-dimensional structure is insoluble and nonmelting and doesnt blend with raw rubber very well. Before added into raw rubber, WRP should be modified. In this paper ,the modification methods of WRP which contain grafting, sol-gel and reactive gas treatment method,through the unbroken three-dimensional network are described.
Development of the Tunnel Wet Dust Precipitator and Testing
Authors: Shi Ling , Yang Cheng Wu , Yu Xin Ming , Luo Xian Wei
Published: September 2013

The tunnel wet dust precipitator (TWDP) is designed and applied to the underground mine tunnel dust control. The TWDP is a modular design with the disc which the radiant fine stainless-steel filament and nozzle. Discs are used in serial in axial direction in the TWDP to lift the collection efficiency, and discs are parallel in a section to enlarge the volumetric flow rate. The TWDP, which is connected with the local fan, is mounted at the discharging mine platform, and the experiment is conducted for its performance testing. Results show that the collection efficiency for respirable dust is above 80%.
Resistance of Hard-Facing Deposit Created by Laser Surfacing Technology
Authors: Pauliček Tomáš , Kotus Martin , Daňko Marek , Žúbor Peter
Published: September 2013

Presented study deals with the resistance of a surface layer created by laser surfacing. Hard surfacing metal powder of type UltrAloy 10611 with a 50 % share of tungsten-carbide particles was used for laser surfacing. Created weld was tested in laboratory conditions (hardness HRC) as well as in field soil conditions (relative wear resistance). Obtained results confirm that this added material is suitable for use in conditions where high abrasive wear is present
Boron Effect on Mechanical Properties and Structure of Steel STN 41 5230 Surface Layer
Authors: Kováč Ivan , Mikuš Rastislav , Drlička Róbert , Žitňanský Ján
Published: September 2013

This paper deals with the possibility of applying controlled diffusion processes in the remelting of steel surface layers using the electric arc of non-consumable electrode in the environment enriched with selected elements. The objective was to achieve an increased wear resistance. Boron was used in experiments as an alloying element. An assumption was stated in the experiment design that environment dissociation and ionisation can be achieved using electric arc, allowing diffusion processes initiation in the surface layer of remelted steel. Conditions for hard and stable structures formation with required properties should be achieved by surface layers enriching. Steel grade STN 41 5230 was used in experiments. Hardness and relative abrasive wear resistance values were measured on samples after remelting, being crucial as for required properties of surface layers. Not only hardness values were measured in the remelted layer but also their course inwards the material up to reaching the depth of base material not affected by heat. The metallographic analysis of remelted samples was made as well. A significant increase of parameters observed in the boron remelting environment was found. The dependency of the environment effect on the change of properties and boron content in the remelting environment was observed.
Determining the Capability of Production Equipment
Authors: Ferancová Martina , Hrubec Jozef , Krchnák Peter , Földešiová Daniela
Published: September 2013

The aim of this article is the introduction of statistical control in the manufacturing process of Ribe Slovakia, k.s. (limited partnership) in Nitra, Slovak Republic, which consists of determining the capability of production equipment. The chosen production equipment is a multistage forming press SACMA SP 260, which was used in the process of cold forming when manufacturing screws of type WZ 13 340 intended for engine blocks. Determining the capability of production equipment involves removing 50 consecutive products, identification and evaluation of stability (construction of card and card), determination of normality (construction of frequency distribution series, histogram and cumulative relative frequency curve), and calculation of capability indices of production equipment Cmand Cmk.
Optimization of Parameters in the Compression Moulding Process of Thermoset Products
Authors: Ružbarský Juraj , Žarnovský Jozef
Published: September 2013

This article analyses the optimization of technological and machining parameters when processing thermosets. These parameters were optimized by various tests, e.g. cooking and pressure test. The reason for using the cooking test is that thermosets are low molecular weight compounds and this test provides a picture of their ability to absorb the liquid. The importance of optimizing the parameters is in the fact that after moulding of thermosets, it is not possible to melt and mould them again. Therefore, every moulded piece that does not satisfy the quality conditions is a reject and loss for the company [1,2]. The article shows limiting parameters and contains proposed optimizations for moulding in order to avoid rejects and damage to machines. The three main technological parameters of moulding are examined, namely compaction pressure, mould temperature and moulding time. The external parameter is thermoset temperature [3,4,5].
Preparation and Microstructure of Titania (TiO2) Nanotube Arrays by Anodization Method
Authors: Samran Buagun , Krongkitsiri Pacharee , Pimmongkol Saichol , Budngam Sopon , Tipparach Udom
Published: September 2013

TiO2 nanotube arrays were successfully synthesized by the anodization method of Ti foils in electrolyte containing the mixtures of ethylene glycol (EG), ammonium fluoride (0.3 wt % NH4F) and deionized water (2 Vol % H2O). A constant dc power supply at 50 V was used anodization process with different anodizing times. The resultant samples were annealed at 450 °C for 2 h. TiO2 nanotube arrays were studied by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The prepared TiO2 NTs has diameter in 50-200 nm. The minimum of diameter TiO2 nanotube arrays was approximately 50 nm for 1 h of anodization process.
The Effect of Injection Parameters on Morphology in Metal Injection Moulding
Authors: Muangwaeng Bhawan , Rojananan Surasit , Rojananan Siriporn
Published: September 2013

The aim of this work is to investigate the effect of injection parameters on morphology in stainless steel 316L metal injection moulding. In the experiment, samples were prepared by injection moulding process with varies parameters such as gate locations, pressures and speeds. The physical appearance of green parts was examined. After that, the cross sections of samples were investigated by scanning electron microscope including chemical analysis of the phase determined by x-ray energy dispersive spectroscopy. The experimental results showed that a perpendicular gate injection caused a separate section between outer skin and core at the cross section of specimens. The high pressure and speed for both injection directions caused crack. In conclusion, a parallel gate injection of feedstock with low pressure and speed was successful to mould the homogeneous samples without black streak, crack and phase separation. Therefore, the observed results could be useful to establish guideline for moulding in order to receive the complete green parts without defects
Magnetoelectric Properties of BaTiO3 – Co0.5Ni0.5Fe2O4 Composites Prepared by the Conventional Mixed Oxide Method
Authors: Pulphol Nattakarn , Muanghlua R. , Niemcharoen Surasak , Pecharapa Wisanu , Vittayakorn Wanwilai C. , Vittayakorn Naratip
Published: September 2013

Multiferroics, which display simultaneous ferrimagnetic and ferroelectric properties, have been interesting recently because of their potentially significant applications in multifunctional devices such as magnetic resonance, drug delivery, high-density data storage, ferrofluid technology, etc. Composites combining BaTiO3 with Co0.5Ni0.5Fe2O4 have influenced the interest of many researchers, due to their outstanding and distinguished character called magnetoelectric (ME). In this work, ferrimagnetic-ferroelectric composites of BaTiO3 nanopowder and Co0.5Ni0.5Fe2O4 nanopowders were prepared by a conventional mixed oxide method. The multiferroic ceramics were compounded with the formula, (1-x)BaTiO3-(x)Co0.5Ni0.5Fe2O4, in which x = 0, 0.05, 0.10, 0.20 and 0.35. All of the compositions were analyzed by an X-ray diffractometer (XRD) in order to reveal the phase of perovskite and spinal structure. Scanning electron microscopy (SEM) was used to examine the variation of morphology and grain size of the composited ceramics. The magnetism of all the ceramics was measured using a vibrating sample magnetometer (VSM). The results showed that microstructure and the amount of ferrite are related strongly with magnetization.
Characterization of Zn0.96Al0.02Ga0.02O Thermoelectric Material
Authors: Pilasuta Panida , Muthitamongkol Pennapa , Thanachayanont Chanchana , Seetawan Tosawat
Published: September 2013

Crystal structure of Zn0.96Al0.02Ga0.02O was analyzed by X-Ray diffraction (XRD) technique and the microstructure was observed by scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The XRD results showed single phase and hexagonal structure a = b = 3.24982 Å, and c = 5.20661 Å. The SEM and TEM results showed the grain size of material arrangement changed after sintering and TEM diffraction pattern confirmed hexagonal crystal structure of Zn0.96Al0.02Ga0.02O after sintering.
Effect of Operated Pressure on Anticorrosive Behavior of Ta2O5 Thin Film Grown by D.C. Reactive Magnetron Sputtering System
Authors: Khemasiri Narathon , Chananonnawathorn Chanunthorn , Horprathum Mati , Rayanasukha Yossawat , Phromyothin Darinee , Bunjongpru Win , Porntheeraphat Supanit , Nukeaw Jiti
Published: September 2013

Tantalum oxide (Ta2O5) thin films, 100 nm thick were deposited by D.C. reactive magnetron sputtering system at different operated pressure on unheated p-type silicon (100) wafer and 304 stainless substrates. Their crystalline structure, film surface morphology and optical properties, as well as anticorrosive behavior, were investigated. The structure and morphology of films were characterized by grazing-incidence X-ray diffraction (GIXRD) and atomic force microscopy (AFM). The optical properties were determined by spectroscopic ellipsometry (SE). The corrosion performances of the films were investigated through potentiostat and immersion tests in 1 M NaCl solutions. The results showed that as-deposited Ta2O5 thin films were amorphous. The refractive index varied from 2.06 to 2.17 (at 550 nm) with increasing operated pressure. The corrosion rate of Ta2O5 thin film improves as the operated pressure decreases. The Ta2O5 thin films deposited at 3 mTorr operated pressure could be exhibited high performance anticorrosive behavior.
XPS Investigation of an Increasing C-H Vibration of Pentacene Doped with Indium
Authors: Chanhom Annop , Prajuabwan Pakorn , Rojanasuwan Sunit , Jaruvanawat Anuchit , Rangkasikorn Adirek , Nukeaw Jiti
Published: September 2013

We investigate the increase of C-H vibration in benzene rings of pentacene molecule upon doping with indium by the X-ray photoelectron spectroscopy (XPS) characterization technique. The risen of C-H vibration spectral component is employed to demonstrate the charge transfer between In dopant atoms and C atoms in benzene rings of pentacene molecule. This experiment can be used to explain the same mechanism of charge transfer between In dopant atoms and C atoms in In-doped nickel-phthalocyanine(NiPc).
Structural, Morphological and Adhesion Properties of Cofeb Thin Films Deposited by DC Magnetron Sputtering
Authors: Ibuki Chuleerat , Sakdanuphab Rachasak
Published: September 2013

In this work the effects of amorphous (glass) and crystalline (Si) substrates on the structural, morphological and adhesion properties of CoFeB thin film deposited by DC Magnetron sputtering were investigated. It was found that the structure of a substrate affects to crystal formation, surface morphology and adhesion of CoFeB thin films. The X-Ray diffraction patterns reveal that as-deposited CoFeB thin film at low sputtering power was amorphous and would become crystal when the power increased. The increase in crystalline structure of CoFeB thin film is attributed to the crystalline substrate and the increase of kinetic energy of sputtering atoms. Atomic Force Microscopy images of CoFeB thin film clearly show that the roughness, grain size, and uniformity correlate to the sputtering power and the structure of substrate. The CoFeB thin film on glass substrate shows a smooth surface and a small grain size whereas the CoFeB thin film on Si substrate shows a rough surface and a slightly increases of grain size. Sticky Tape Test on CoFeB thin film deposited on glass substrate indicates the adhesion failure with a high sputtering power. The results suggest that the crystalline structure of substrate affects to the atomic bonding and the sputtering power affects to intrinsic stress of CoFeB thin film.
Alkali-Catalyzed Transesterification of Waste Cooking Oil to Prepare Biodiesel by Ultrasonication
Authors: Gao Ming , Guo Cui Bao , Lin Xing
Published: September 2013

Biodiesel is a renewable, biodegradable, and nontoxic fuel. At present, biodiesel is primarily produced in batch reactors in which the required energy is provided by heating accompanied by mechanical mixing. Alternatively, ultrasonic processing is an effective way to attain required mixing while providing the necessary activation energy. Biodiesel was synthesized by waste cooking oil using ultrasonication and alkali-acid catalysis method. Its structure was characterized by gas chromatograph, and the effects of various factors on transesterification rate were studied. The results show that a biodiesel yield in excess of 91% can be achieved in 30 min, at the 30Hz amplitude level, methanol/oil weight ratio of 1.3, 2% of alkaline, reaction temperature of 40-50 °C..
Advanced Treatment Process of Metal Ions in Wastewater from a Mine
Authors: Chen Jian Hua , Huang Yan Lei , Wu Bo Zeng , Li Da Rong
Published: September 2013

This paper mainly studied the removal of metal ions in wastewater from a mine. On the research basis of using traditional coagulation-sedimentation process to remove metal ions, this study took Zn and Cd ions as major research targets, and conducted the research of advanced treatment of mining wastewater. Enhanced coagulation and enhanced ion exchange process was adopted, and water quality indexes after treatment reach the national third class standard of surface water quality.
The Research of Micro Arc Oxidation Behavior of the Magnesium Alloy
Authors: Zhang Yun Long , Li Mu Qin , Zhang Yu Min , Hu Ming
Published: September 2013

The ceramics coating hadobtained by the micro arc oxidation technology in order to resolve thecorrosion resistance of the Mg alloy.The phase composition, surface morphology,gained weight and polarization behavior of the micro arc oxidation coating wasinvestigated in details. After the introduce of the sodiumcitrate in the electrolyte solution, thespecimen had high relatively positive potential and low corrosion current, sodoped sodium citratewould improve the corrosion resistance properties of the Mg alloy .
Study on the Determination of Manganese in Alloy Steel Materials by Spectrophotometry
Authors: Li Mei Mei , Li Nai Jun
Published: September 2013

With samples decomposed by mixed acid of sulfuric acid-phosphoric acid, manganese in alloy steel was determined by periodate spectrophotometry. The acid system for dissolving samples was established, and 525 nm as the optimal measuring wavelength was selected. The results showed that Beer's law was obeyed in range of 0 to 36μg/mL for manganese (II). The relative standard deviations were between 0.6% to 2.0%(n=6). The recoveries of samples were between 95.1to 101.4%.
Evaluation of Thermal Properties of Fibre Insulation Materials for Inflatable Mini Cold Storage
Authors: Wu Yan , Han Jiu Chun , Li Xi Hong , Li Zhi
Published: September 2013

Fibre materials, as thermal insulation materials, will be an optimum choice for inflatable mini cold storage. The evaluation index such as infrared spectrum, thermal stability and thermal conductivity is closely related to the selection and application of fibrous insulation materials. The results showed that the transmittance of bamboo fibre tested by Fourier Transform Infrared Spectroscopy (FTIR) measurements was about 35.3% with an advantage to the heat preservation, and radiation heat transfer was analyzed in the area of far-infrared. The initial decomposition temperature of 1#, 2# and 3# measured by TGA curve was respectively 383.9°C, 372.5°Cand 315.4°C, and the total thermal weight loss rate of 1#, 2# and 3# was 64.59%, 90.16% and 80.47%. The thermal conductivity of 1# at 0°C was 0.035 W·m-1·K-1, lower than 2# and 3#, also lower in the temperature range from 0°C to 8°C, measured by hypothermia thermal instrument.
Preparation and Electromagnetic Properties of Urchinlike Ni
Authors: Qi Hai Ping , Cao Hai Lin , Huang Yu Dong
Published: September 2013

Urchinlike Ni particles with different length and quantity spines were successful synthesized. The microstructures and morphologies of the resulting materials were investigated by X-ray diffraction and scanning electron microscopy. The amount of N2H4H2O plays an important role in the morphology of urchin. The electromagnetic parameters of these urchinlike Ni were measured with vector network analyzer at 2-18 GHz frequency. The results indicate that the microwave absorbing properties are improved by the urchin structure.
Effect of Equal Channel Angular Pressing and Annealing on Corrosion Resistance of Al-Cu Alloy
Authors: Fang Da Ran , Liu Chun , Liu Feng Fang
Published: September 2013

Al-3.9wt.%Cu alloy was subjected to equal channel angular pressing (ECAP) and subsequent low temperature annealing treatment, and the corrosion resistance of the samples was investigated by potentiodynamic polarization measurements in 3.5% NaCl solution. The results show that the corrosion rate of the ultrafine-grained alloy increases, in comparison with the coarse-grained alloy. Meanwhile, it is noted that the corrosion resistance of the alloy subjected to ECAP can be improved by relief annealing.
Low Temperature Resistant Material Study of Fitting in Power Transmission Line
Authors: Niu Hai Jun , Zhang Jun , Si Jia Jun , Liu Zhen
Published: September 2013

Establishing large coal fired power, hydropower and wind power bases in the energy resources centre and large capacity long distance power energy transmission are main way to solve resource contradiction according to distribution characteristic of energy resource in our country. Power transmission line shall avoid influence of high altitude and low temperature etc environments in long distance power transmission, such as western area, the steel material of the fitting in the line with low temperature requirement shall have good low temperature resistant brittle, therefore the fittings in the power line are requested to have good low temperature resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of metal material, carry out analysis on possibility of application of the low temperature resistant material in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, test characteristics of the fitting etc.
Kinetic Studies and Adsorption Property of Activated Carbon from Heilongjiang Blended Coal for Phenol
Authors: Shao Jing Jing
Published: September 2013

HSAAC was prepared from coal blending test of Qitaihe Coal and Yilan Coal with KOH activation method under N2 protection, to study its adsorption property for phenol in aqueous solution. Kinetic studies showed that adsorption of activated carbon for phenol fitted the second order kinetic model. The second order rate constants k2 is 1.9515×10-2 g•mg-1•min-1.
Experimental Study on Fluid Mechanics of Nozzle and Ammonia Desulfurization of Iron and Steel Sintering Furnace
Authors: Zhang Zhong Hui , Li Yong Hui , Lan Yao Zhong
Published: September 2013

The key technology of empty absorption column is the atomizing effect of Nozzle, The good atomization effect of The nozzle can improve the transfer effect. The high efficient atomizing nozzle with the built-in spiral, reverse flow and large flow is designed in this paper. It completely solves the contradiction between plug and atomization. Application of atomizing nozzle in ammonia desulfurization of empty tower ,it also achieved very good results, Compared to other nozzle which is widely used, the desulfurization effect is improved by 5-6% in empty absorption column.
The Optimization Design Study of Warm Extrusion Forming Technology for Piston Head Semi-Processed
Authors: Lv Qing Qing , Guan Qi Ming , Yang Li Quan , Wang Xi Kui
Published: September 2013

Aiming at the problems of high performance piston head can not produced by using casting and hot die forging, the warm extrusion molding method is proposed, based on the analysis of factors influencing for forming, rational scheme of orthogonal experiment was designed, a series of analysis for simulation results by using the range analysis method and comprehensive balance method, the optimal forming process parameters combination are identified, the optimal result are verified by the DEFORM software.
Analysis of Microstructure Abnormal of P91 in Water Storage Tank of Super-Critical Units Caused by Impropriety Heat Treatment
Authors: Du Hao Yang , Yang Jian , Zhang Chun Lei , Ren Zhen An
Published: September 2013

Hardness heterogeneous on weld metal and base metal in complicate structure of water storage tank was found after examination. Replica metallographic examination in hardness heterogeneous zone shows abnormal microstructures. Ostwald Ripening structure was caused by uneven temperature control during heat treatment. Lower cooling speed is the main cause of forming tempered sorbite in weld joints.
Numerical Simulation on Two Inlet Structure of Hydrocyclone
Authors: Song Ruo Feng , Yang Yong Teng , Zhao Lei , Fang Fang
Published: September 2013

The influence of inlet structure which is the tangent and Spiral on water-coal separation in a Hydrocyclone is simulated by CFD in this paper. Mixture model in fluent and the RNG K turbulent model are adopted using numerical simulation by FLUENT software. The pressure gradient term is calculated by STANDARD discrete numerical method, and a second order upwind scheme is applied as discrete form for the rest of terms; the SIMPLE algorithm is adopted to deal with the pressure-velocity coupling. The fluent of the two inlet structure on the inner fluid of the hydrocyclone is obtained. It can be concluded that in actual applications, separation efficiency of the hydrocyclone with spiral inlet the entrance is higher, separation effect is better. The numerical simulation can provide a foundation for structural optimization design of hydrocyclone.