bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Warranty Management Survey and Improving Measures of Chinese Manufacturing: An Empirical Study
Authors: Cao Li Si , Liu Zi Xian , Liu Yi Liu , Wang Wen Jia
Published: February 2012

This document reflects the warranty management situation of Chinese manufacturing enterprise by investigating 93 manufacturers including automobile, electronics and machinery equipment. By the investigated data of warranty cost ratio of revenue, we can find the gap between Chinese manufacturers and abroad. The next, through the statistics analysis of factors influencing the warranty cost, we find that the management of suppliers and outsourcers, cost control strickly and the cost accounting system are helpful to decrease the warranty cost. According to the analysis, the paper make suggestions in warranty cost management to Chinese manufacturers
Effects of HDI/IPDI Ratio on Properties of Waterborne Polyurethane
Authors: Zhou Ming Ji , Jiao Qing Ze , Zhao Yun , Cui Wen Jia
Published: February 2012

A waterborne polyurethane (WPU) dispersoid was synthesized through the prepolymer method using aliphatic isocyanates [namely isophorone diisocyanate(IPDI), hexamethylene diisocyanate(HDI)] and self-made polyester polyol as main raw materials. The effects of HDI/IPDI ratio on properties of waterborne polyurethane were discussed. The FTIR results confirmed the successful synthesis of WPU. As the molar ratio of HDI/IPDI increased, the properties (including elongation at break, solvent resistance, viscosity and thermal stability) increased, while the tensile strength and the average particle size decreased. The stable WPU with light blue and translucent were obtained when the HDI/ IPDI ratio was 1.5:1.
Mathematical Modeling of HCL Gas Emission Based on GEP
Authors: Lou Gang Yong , Liu Li Lan , Yu Tao
Published: February 2012

For the characteristics of acid regeneration which is highly complex and nonlinear and the problem of unstable emission concentration of HCL gas in steel industry, Gene Expression Programming is applied to mathematical modeling emission concentration of HCL gas of acid regeneration in a steel factory. 11 key process variables are taken as modeling variables to mine model in history data with GEP, which is then applied to predicting emission concentration in training set and validation set. The results indicate that the model set up by GEP can predict emission concentration effectively, and conduct the production of acid regeneration timely and accurately.
Grey RBF Neural Network Forecasting on LV under the View of Government Responsibility
Authors: Zhang Feng Rong , Fet Annik Magerholm , Xiao Xin Wei
Published: February 2012

At present, the domestic research on the scale of macroscopic logistics has yet belonged to the blankness, therefore, this research tries using LV in circulation and LV in stock to measure the logistics volume and forecasting it in a long period. In order to overcome the phenomenon of “floating upward” in long-term period, this paper establish the improved Grey RBF to forecast the LV next 5-10 year in Jilin province of China. The results show that the increased circulation of goods is the main reason leading to increased logistics volume, and the simulation also shows that the improved gray RBF neural network model is a good method for the government to establish the logistics development policy.
Carbide Evolution of a Directionally Solidified Ni-Based Superalloy during Long-Term Exposure
Authors: Xiao Xuan , Le Xu , Chao Zeng , Sheng Li Yuan , Guo Yong An , Zhou Lan Zhang
Published: February 2012

Directionally solidified Ni-based superalloy DZ483 is a kind of potential material for the blade of an advanced heavy duty gas turbine, which has good combination properties. The carbide degradation behaviors of DZ483 alloy during long-term thermal exposures were investigated at different conditions in this paper. The results show that during the long-term exposure, primary carbide will decompose in the form of MC + γ → M23C6 + γ'. Carbide on the grain boundary could be decomposed more easily than intragranular carbide. With the increase of aging time, decomposition could be observed more obviously, carbides on the grain boundary become bigger and the morphology of carbide near the grain boundary tends to be more complex. The fine dispersive particles of M23C6 on the grain boundary will grow up gradually to a thin consecutive chain of carbide with the increase of aging time.
Preparation of Al-Ti-N Master Alloy Grain Refiner for Al
Authors: Wang Z.Q. , Chen C.J.
Published: February 2012

An Al-Ti-N master alloy was prepared through the addition of AlN and Ti powders into pure Al melt heated in an induction furnace. This master alloy shows a higher grain refinement effect for pure Al than Al-Ti due to the formation of TiN and/or AlxTiyNz particles in the Al matrix. DTA, SEM and XRD results suggest that TiN and/or AlxTiyNz particles start to form at about 970°C during heating the Al-Ti-AlN powder mixture.
Study on OA System Structure Based on Cloud Computing
Authors: Guo Ling Long , Wen Hao Yu
Published: February 2012

Cloud computing is of important value and significance to apply in information system. After analyzed the disadvantages of traditional OA System, this paper outlined a new solution for the OA system, which uses the cloud computing architecture based on service. The solution is described in detail in this paper. The feasibility and advantages of the solution are also shown in this paper by theoretical analysis.
The Ways of Implementing EPR on WEEE: An International Comparison
Authors: Li Meng Die , Zhang Jing , Lu Wen Li
Published: February 2012

This paper compares legislative difference of EPR on WEEE in eight developed countries and districts. We study the ways of implementing EPR on WEEE through analyzing compliance mechanisms and returned logistics network. Combing with their results and taking national actual conditions into account, certain recommendations for implementing EPR in China are given, from the perspective of local authorities and producers.
The Coal Mine Flooding Emergency Ability Evaluation Based on GA-WNN
Authors: Wang Jin Feng , Feng Li Jie , Li Zhao Hui
Published: February 2012

For the coal resources working which are affected by the coal mine flooding seriously, this paper make an analysis on the factors which affect the coal mine flooding emergency ability evaluation model based on GA-WNN is established through the wavelet neural network value which is optimized with genetic algorithm. This model combined the global optimization ability of genetic algorithm with the time-frequency localization of wavelet neural network. This combination can make up for many defects (for example, the neural network structure should be given artificially, the function can got local minimum easily and so on). Therefore, the local mine flooding emergency ability evaluation model based on genetic algorithm and wavelet neural network have higher reliability and calculation ability, and is beneficial to the pre-control management for coal mine flooding rescue.
Research on Distribution Model and Algorithm of Timeliness Clothing
Authors: Pang Qian Chao , Wang Xin
Published: February 2012

According to the features of clothing distribution timeliness, fuzzy math model of timeliness clothing is built. Then the relationship of timeliness clothing and penalty factor is studied, and nonlinear function of them is built. On the basis of objective factors, such as weather, road quailty and so on, VRP model of timeliness clothing and optimal path of clothing distribution is built. Furthermore, by taking step-sequence way and LINGO software, VRP model of timeliness clothing and optimal path of clothing distribution is solved. The feasibility of the model and the algorithm is verified by practical examples.
Abnormal Pattern of Sensor Monitoring Data Analysis and Recognition
Authors: Zhu Shi Song , Zhu Fu Jing , Man Wen Hui
Published: February 2012

In order to solve the abnormal pattern recognition problem of the sensor monitoring data automatically, a set of method on the time series similarity measurement is used in this paper. Abnormal time series patterns clustering analysis based on the DTW distance is proposed firstly, thus the typical time series patterns can be obtained. From which the important shape indexes can be extracted and filtered based on piecewise shape measure method, then the shape index table can be established. With which a pattern recognition system can be designed used to recognize these abnormal patterns on real-time. As a case, this method has been used in a high gas coal mine and the important promotion application value has been proved in the sensor monitoring field.
Traffic Sign Recognition Utilizing an Eigen Space Method Based on the KL Transform
Authors: Miyata Shigeharu , Ishikawa Takahiro , Nakamura Hitomi , Takehara Shin
Published: February 2012

This study explains that a method utilizing the eigen spaces obtained by the KL transform for automatic recognition by camera of the speed on a speed limit sign has the following advantages: it is robust in response to changes in intensity patterns caused by the direction the sign is facing and by the amount of light striking the sign, and it is able to reduce the recognition processing time by reducing the number of feature vector dimensions during analysis. The method for recognition of traffic signs previously proposed by the authors of this study was a method for recognition based on extracting geometric shapes from the sign and recognizing them based on their aspect ratios. As such, this method was not able to identify the numbers on a speed limit sign, all of which have identical aspect ratios. It will be shown that the method in this study is able to recognize nearly all speed limits indicated on traffic signs within several 100s of ms after image acquisition. This method was applied to still images and its effectiveness was verified from the perspective of the following requirements for providing accurate information concerning the vehicle surroundings to the driver: high processing speed, high recognition accuracy, detection of all detectable objects without omission, and robustness in response to changes in the surrounding environment.
Based on DEA/AHP Centralized Procurement Model of Electrical Equipment Supplier Optimization Study
Authors: Li Chun Jie , Cui Ai Qiao , Liu Zhu Long , Cheng Yan Cong
Published: February 2012

Centralized procurement is a development direction for modern manufacturing industry to enhance supply chain management. Scientific and rational choice of suppliers not only reduces procurement costs and risks, improving product quality, but also enhances the market competitiveness of the supply chain. In this paper, we adopt DEA / AHP method to rank the optional vendor based on the main factors of procurement, and ultimately determine the optimal supplier.
Research on Contract Logistics Mathematical Model and System Based on Lindo and Baidu Map
Authors: Huang Xiao , Cao Bu Yang
Published: February 2012

Based on fleet size and mix vehicle routing problem (FSMVRP), the article analyzes the contract logistics transport demand and characteristics. The authors establish a fleet combination and route optimization model with multiple transfer centers and multiple transport methods. Furthermore, according to the webgis service of Baidu Map, the authors develop a corresponding logistics system according with J2EE framework. Finally, Lindo solver figure out the minimum cost and solution for the dedicated situation, and results display in the Baidu Map.
Design and Implementation of Wireless Data Transceiver Terminal Based on GPRS
Authors: Ma Li , Wang Chun Lei
Published: February 2012

Aim to the problem of environmental monitoring in real-time remote data collection, transmission, remote control and analysis, the ZigBee protocol and communication principle is discussed, Through GPRS technology to achieve the remote monitor and information transmit. Based on the Core board S3C2440 to design the circuits; design and complete embedded software WSNIPS and the server software in the VS2005 development. Achieved through MC35i module connection GPRS network and Internet monitoring center for the overall monitoring of the urban environment provides a good platform.
Sensing System for Bisphenol a Utilizing a Molecularly Imprinted Polymer Modified Electrode
Authors: Kubo Izumi , Yokota Nobuyuki , Nakane Yuko
Published: February 2012

In order to develop an electrochemical sensing system for bisphenol A, molecularly imprinted polymer (MIP) thin layers for bisphenol A were polymerized on a sputtered gold electrode by UV light irradiation for 2 – 30 min. Their thickness, which was determined by QCM analyzer, was 3.6 ±0.3 nm for 5min of irradiation and increased as the irradiation time increase to 30 min. AFM images of MIP modified surface suggested that the gold electrode was covered with MIP smooth layer. The responses to BPA and ascorbic acid of the gold electrode and MIP modified electrode were examined by cyclic voltammogram, and their anodic peaks were compared. The electrode with MIP polymerized for 5min showed more selective to BPA than that for 2min. This electrode can be served as BPA sensor and the anodic current of BPA depended on its concentration at the range of 5-15 μM.
Unit Root Tests of Structural Break with GARCH-Error Process
Authors: Wang Jing Yong , Xue Li Da
Published: February 2012

This paper studies the effect of GARCH process on the robustness and reliabilities of unit roots test with structural breaks. It gives that, as the GARCH process approaches integratedness, the test statistic’ the proportion of rejections reported actually increases as the sample size increases. Consequently, we can see that the standard asymptotic theory is inapplicable in this case. The statistic , their actual test size on the whole is accordant to nominal size in unit root and no break as the volatility parameter is small, =0 or approach to 0. The statistic exists a serious over sizing of null hypothesis as integratedness in all structural break type. The statistic test power increases as the sample size increases, but test power do not increases as the sample size increase under AR parameter. Test power increases as integratedness increases, and decreases as volatility parameter increases.
Synthesis and Characterization of Mg-Al Layered Double Hydroxide
Authors: Yin Wan Zhong , Tan Qi , Liu Lei , Li Xiao Li
Published: February 2012

Mg-Al layered double hydroxide was synthesized by the method of mechanochemistry /crystallization at the dry milling time of 6 h, wet milling time of 2 h, milling speed of 250 r/min, and ball to powder weight ratio of 50 to 1 using brucite, Al(OH)3 and Na2CO3 as the raw materials. Characterizations of the materials were achieved by XRD, TEM, FT-IR and TG-DSC. The results showed that well crystallized Mg-Al LDH with average partical size of 40 nm were synthesized under this condition. Mg-Al LDH was formed with CO32- freely intercalated between the hydroxide host layers. The material generally decomposed via two distinct stages. The first stage at 229.5 °C was attributed to the loss of interlayer water, and the second stage at 407.8°C was due to the loss of hydroxyl groups from the brucite-like layer, as well as of the carbonate irons.
Theoretical Analysis of the FTIR Absorption Characteristic of Nano-Powder
Authors: Liu Guo Liang , Qi Yan , Zhu Yi Min , Ma Zhi Jun
Published: February 2012

The infrared absorption behaviors of nano-MgO with different sizes have been investigated based on XRD and IR data. The blue shifts of infrared absorption peaks with the decrease of the particles size have been analyzed by constructing one-dimensional vibration model. Adopting the quantum physics analyzed method, we provide the reasonable explanations for the red shifts of infrared absorption peaks as the average particle size of nano-MgO powder is down to less than 50 nm.
An Iron Ore Beneficiation Test of a Region in Anshan
Authors: Li Yan Jun , Jin Chen Yuan , Wang Cheng Liang , Tan Wen Cai , Sun Zheng
Published: February 2012

This test is in relation to a low-grade co-selected and mixed concentrates that produced from weak magnetic– magnetic beneficiation. Through the flotation tests step by step and control of variables to study the changes of starch’s amount and inhibitor collector’s amount in the impact of test results in the anti-flotation and the flotation process At the end, we received a grade of 55.65%, 57.19% recovery of iron ore products, iron ore products calcined at 800 °C for 40min under the conditions you can get concentrate grade of 60.14% of the product.
Effect of Roasting Temperature on High Temperature Sintering Process of Different Mass Ratio of CaCO3/ SiO2
Authors: Gao Ying , Han Yue Xin , Li Wenbo , Liu Jie
Published: February 2012

Roasting temperature is a significant factor for synthesis of wollastonite by high-temperature roasting. In this paper, experiments were carried out at various temperatures by using quartz and nanometer calcium carbonate mixed in different ratios. The synthetic products under the condition of different roasting temperatures and initial temperatures were characterized by means of XRD. The results indicated that initial temperature had a remarkable effect on the synthetic product during calcination at 1300°C for 2 h when nanometer calcium carbonate and quartz were mixed in such ratios as 2.3:1 and 4:1 by weight.
Physical Principle of X-Ray Separatation and Pre-Sorting Experiment on the Low Grade Ore of Mo and Ni
Authors: Liu Ming Bao , Yao Jin , Yin Wan Zhong , Duan Li Yi , Gao Ying , Han Yue Xin
Published: February 2012

This article describes the theory foundation of X-ray separation technology and introduces the study status, configuration and work principle of X-ray separator. This paper also conducts X-ray separating experiment on the low grade ores of Mo and Ni respectively in Liaoning province. The low grade Mo ore experiment can obtain a good result with the concentrate recovery, enrichment ratio and concentrate grade being 73.11%, 2.03 and 0.130% respectively and the tailings discarding ratio being 63.70%. The low grade Ni ore experiment can obtain a good result with the concentrate recovery and enrichment ratio concentrate grade being 61.92%, 1.45and 0.64% respectively and the tailings discarding ratio being 61.63%.
Preconcentration Research on Mineral Processing for a Extremely Lean Iron Ore in Inner Mongolia
Authors: Li Lin , Lu Xian Jun , Qiu Jun
Published: February 2012

The results show that under the condition of grinding fineness(-200 mesh content) of 52.88% and magnetic field intensity of 0.2T, the index of concentrate yield is 13.25%, concentrate grade is 58.75% and concentrate recovery is 57.32% with preconcentration technology by magnetic separation.
Removing Mechanism of Bacteria of LKD in Bauxite Flotation Separation
Authors: Yang Shu Yong , Dai Shu Juan , Yu Lian Tao , Deng Li Jia
Published: February 2012

The depressing function of bacteria of LKD on diaspore and kaolinite is studied through flotation experiments, mineral ζ-electric potential and infrared spectroscopy analysis. Waste beer has better selective and depressing effects on diaspore in the range pH 2-10 than starch-like substances do. The analysis of mineral ζ-electric potential and infrared spectra shows that the bacteria of LKD is chemically adsorbed to diaspore via its –COOH and stays on the surface of mineral firmly. Meanwhile, the functional groups -OH of yeast itself and some -COOH are hydrophilic, which helps the mineral being hydrophilic as well. Although the structure of phyllosilicate kaolinite determines its good floatability on the condition of strong acid, the recovery of diaspore by yeast is 30% more than kaolinite when the diaspore is depressed by bacteria of LKD on the condition of weak acid, pH-6. It indicates the possibility of Al-Si separation by reverse-flotation under neutral conditions.
The Experimental of Preparation of Slow-Release Trace Ni2+ Ceramsite and Study about Influence of Wastewater Anaerobic Treatment
Authors: Su Hui Dong , Fu Dan
Published: February 2012

Using fly ash, cement, lime, gypsum as main raw material, CaCl2, Na2SO4 and NaCl as activating agent, using steam curing method, the strength of ceramsite as main indicator, by orthogonal experiment to determine the best proportion of raw material, discussing the release process of trace metals element of ceramsite. Through contrast test with the blank group, commodity ceramsite group，homemade common ceramsite group, only adding Ni2+ group and slow-release Ni2+ ceramsite group in the microbial reactor can obtain: the removal rate of COD is 66.84%, 74.95% ,80.63%, 82.63% and 91.79% respectively, removal rate of adding modification ceramsite is the peak, 24.95% higher than blank group, 16.84% higher than adding Ni2+ group. Slow-release ceramsite can significantly increase the activity of activated sludge, comparing with other ceramsite and adding trace metal element directly, which has more superior process performance.
Influence of Organic Additives on Shape and Adsorbing Properties of Nano-Fe3O4 Particles
Authors: Zhu Yi Min , Luo Bin Bin , Wan Shu Chao , Ma Zhi Jun , Li Yan Jun
Published: February 2012

Nano-Fe3O4 powders were prepared by chemical co-precipitation method. The granularity, morphology and absorbing properties of the magnetite nanoparticles were characterized by XRD, SEM, TEM and complex permeability. The effects of organic additives to the granularity, morphology and microwave absorption property of nanosized magnetic Fe3O4 were studied. The results show that the organic additives have great influence on the morphology of nano-Fe3O4 particles. Spherical nano-Fe3O4 is prepared by oxalic acid. And the absorption property of nano-Fe3O4 is better.
Micron/Nano Powder Compositing Studies in Tsinghua University
Authors: Yang Bing , Yang Yu Fen , Gai Guo Sheng
Published: February 2012

In this paper, the recent studies of our lab in Tsinghua University are reviewed in detail with regard to methods of preparing Nano-powders, Micron/Nano composite and Nanostructure surface; Ways to characterize the properties of Nano particle and Nano surface are summarized. And in addition, the industrial applications of powder technology are also introduced.
Study on Technological Mineralogy of Slag Film of Medium Carbon Steel
Authors: Han Xiu Li , Li Chang Cun , Liu Li Na , Feng Run Ming , Yang Hui Ping
Published: February 2012

The mineral composition and microstructure of slag film of medium carbon steel are studied systematically with the methord of the technological mineralogy. The result shows that: The main mineral compositions of slag film are melilite and glass phase, and the texture of slag film is of two-layer or three, in which glassy-layer and crystallizing-layer appear alternately, the crystallization rate is from 2% to 5%. The melilite in slag film is good for improving lubrication and controlling heat transfer, so melilite can be promote in slag film for improving the quality of medium carbon steel.
Numerical Simulation of Interior Flow Field of Reactor Coolant Pump under Station Blackout Accident
Authors: Xu Yi Ming , Xu Shi Ming
Published: February 2012

Numerical simulation is used for researching the transient characteristic and internal characteristic of the reactor coolant pump under station blackout accident. The simulation method has been presented by analyzing difference scheme for governing equations. The analytical model of reactor coolant pump flow field has been established by analyzing adequately the influence of varying rotation speed to the pump external characteristic. Finally, the pump internal flow characteristic is exposed.
Performance of Denitrifying Phosphorous Removal Process Employing Nitrite as Electron Acceptor and the Characterization of Dominant Functional Populations
Authors: Bao Hong Xu , Ma Xi Ping , Wang Jian , Jing Kui , Shen Man Li , Wang Ai Jie
Published: February 2012

A sequencing batch reactors (SBR) was adopted to investigate the denitrifying phosphorus removal efficiency employing nitrite as electron acceptor under anaerobic/anoxic condition. The experimental results showed that high nitrogen and phosphorus removal efficiency could be obtained under the following conditions: nitrite concentration of 30~40 mg/L, COD concentration of 400 mg/L, pH 8.0±0.2 in anaerobic stage and pH 7.2±0.2 in anoxic stage, sludge retention time (SRT) of 22 days. When the reactor performed steadily, a dominant functional strain was screened from the activated sludge, which has high nitrite and phosphorus removal efficiency. Batch tests results showed that the removal degree of nitrite and phosphorus could reach 99.18% and 84.94% respectively when their concentrations were 20mg/L and 10mg/L. according to the morphology and physio-biochemical characteristics, and the results of 16S rDNA sequencing, it is determined that the strain belongs to the Genus of Sphingobacterium. The experimental results achieved in this study might offer guidance to the development of shortcut denitrifying phosphorus removal process.
Some Theoretical Problems Analysis of Melting High Nitrogen Stainless Steels
Authors: Li Hua Bing , Jiang Zhou Hua , Ma Qi Feng , Zhan Dong Ping
Published: February 2012

High nitrogen stainless steels with excellent mechanical and corrosion resistance properties is focused on to develop a new class of engineering material. The manufacture process of high nitrogen stainless steels under high nitrogen pressure is complicated. There are some theoretical problems to be solved for large scale melting and cast high nitrogen stainless steels. The thermodynamic calculation models of nitrogen solubility in the liquid phase, δ ferrite phase and γ austenitic phase built can well predict the nitrogen solubility and analyze the effect of temperature, alloy components and nitrogen pressure on the nitrogen solubility. The minimum nitrogen pressure for preventing the nitrogen porosity formation has been calculated by the micro-segregation. By the analysis nitrogen behavior of melting and cast high nitrogen stainless steels, it is possible to produce high nitrogen stainless steels in a large scale in China.
Studies on the Integration of 1.5th and 2nd Generation Fuel Ethanol Production from Sweet Sorghum Stalks: Economic Performance, Energy Consumption and Carbon Emissions
Authors: Zhao Li Li , Zhang Xi Liang , Chang Shi Yan , Ou Xun Min , Chang Shi Yan
Published: February 2012

The paper investigates the feasibility of integrating 1.5th and 2nd generation (G) conversion technology for ethanol production from sweet sorghum stalks, in terms of economic performance, energy consumption and greenhouse gas emissions (3E). To that end, discriminants were developed for economic analysis to determine the conditions under which the transition from pure 1.5thG to the integration technology takes place. The paper also developed equations to calculate energy output/input ratio and carbon emissions during ethanol production processes. The results indicate that the main barrier of the development of integration technology is the high cost of 2ndG ethanol production. The residues from 2ndG production should be burned to supply energy for the ethanol plant, which is important to enhance the energy output/input ratio and to cut down carbon emissions. Compared with 1.5thG technology, the integration pathway brings about higher energy output/input ratio, but with slightly less amount of carbon emission reduction. However, the absolute amount of carbon emission reduction is still considerable. The estimation shows that the integration technology is promising in long term but infeasible under current conditions.
The Study on Building Materials’ Optimization Based on Fuzzy Technology
Authors: You Li Wen
Published: February 2012

The fuzzy pattern recognition has been proved to be a kind of effective method, and fuzzy comprehensive evaluation method, this paper puts forward a aims to improve the analytic hierarchy process (AHP) application of fuzzy version in the real building materials optimization. According to the logic of the original (crisp) method to solve problems, decision and choice standard, balance by fuzzy framework has been created. Finally, a building materials optimization scheme is put forward a kind of fast, reliable program completion, it is never seen evaluation building materials.
Submarine Operation Tool and Intelligent Device
Authors: Jin He , Xing Meng Qing
Published: February 2012

. Analysis is made to the operating task in ocean, making the series devices of marine intelligent machine the primary study content and having the deep research on its key techniques. At the same time, the corresponding prototype was produced and then tested. It proved to be that the research is feasible and the production is successful. It makes contributions towards the domestic submarine operating technology.
Optimization of Process Parameters of U-Shape Sheet Metal Based on Compensation of Geometric Springback Value
Authors: Jia Xiang Wu , Hu Shu Gen
Published: February 2012

Taking example for U-shape sheet metal, the paper studies the forming and springback process with Dynaform, how much the springback influenced by several factors is studied, including die figure, stamping velocity, the stroke, the blank holder force and friction. Then a useful conclusion can be reached: Using die figure to optimize the technological parameters remarkably reduce the springback value, it provides a new method to control and solve the springback issue.
Adaptive Control of Synchromesh Shifting Process for Automated Manual Transmission
Authors: Gong Peng , Meng Jian Min , Xi Jun Qiang
Published: February 2012

It is difficult to gain the ideal effect by using a single control method for shifting process due to many influence factors of synchromesh shifting process in Automated Manual Transmission (AMT). Synchromesh shifting process is divided into two stages. One is stage of eliminating the gap of synchronizer, and the other is the slipping stage of synchromesh. The paper mainly analyses the control process of eliminating the gap of synchronizer. By adopting the adaptive control to reduce the shock of initial shifting stage, it can reduce impact and abrasion wear, and improve the quality of whole shifting process.
Determination of Trace Iron in Chinese Herbal Medicine Using CdS Quantum Dots as Fluorescence Probes
Authors: Zeng Yun Long , Li Xia Fei , Tang Chun Ran , Huang Hao Wen , Wang Ya Jing , Su Zhong Hua , Zhao Huan , Hu Ya Mei , Li Jin
Published: February 2012

A simple A green protocol for synthesis of high quality, water-soluble and biocompatible CdS QDs have been developed in aqueous solution with amylum as stabilizing agent. The QDs were characterized by AMF and spectral methods. A fluorescence quenching method was developed for determination of iron (ΙΙΙ) with water soluble CdS quantum dots (QDs) as fluorescence probe. In pH 8.5 boric acid–borax buffer solution, the QDs show a high selective to ferric ion. The common cations, such as Ca2+, Mg2+, Zn2+, Fe2+ et al, have no effect on interference but copper ion. The fluorescence intensity of the QDs decreased linearly with the iron (QDs ) concentration in the range of 200 μM to 60 nM with a detection limit of 20 nM. It has been applied to determinate of iron in Angelica, Astragalus, Shouwu, ligusticum wallichii and radix rehmanniae recen.
Synthesis of Myristyl Sulpho Betaine Type Amphoteric Surfactant
Authors: Zhang Rong Ming , Zhang Zhen Yu , Shan Hong Man , Wang Yue
Published: February 2012

A kind of novel betaine type amphoteric surfactant was synthesized using tetradecylamine and pentaerythritol as the starting material. The influence factors of the synthesis process were studied.The optimal condition of the synthesis was gained. The results have show that the reaction time and mole ratio (Dimethyl tetradecyl tertiary/ Intermediate) were 16h and 1.2/1 at 120°C.The structure of myristyl sulpho betaine type amphoteric surfactant was identified by FTIR.Then it was performed the surface tension tests to determine the critical micelle concentration (cmc).
Mathematical Model and Equations of Wash Water Recycling in the Preparation of Layered Double Hydroxides
Authors: Lin Yan Jun , Wei Qiang , Jia Xue Fei , Li Dian Qing
Published: February 2012

A wash water recycling method is used in the preparation of layered double hydroxides (LDHs). Based on the multiple-low-amount principle, a mathematical model and the equations of the washing process have been formulated. The experimental data are very similar to the calculated values, which means that the model and equations can be used to design and optimize the practical process of wash water recycling. The recycling of wash water in this way results in a water-saving of above 80%.
Cu (II), Zn (II) Complexes Containing Calix [4] Arene Modified by Salicylaldehyde Acylhydrazone - Synthesis, Properties and Application
Authors: Zhang Xiao Mei , Xu Guo Cai , Sun Jia Long
Published: February 2012

Two complexes L(MAcO)2(M=Cu, Zn) containing calix [4] arene ligand H2L modified by salicylaldehyde acylhydrazone have been synthesized and characterized by elemental analysis, MS(ESI), IR, UV-vis and fluorescence. Whereas L(ZnAcO)2exhibited an enhancement in fluorescence, the potentiality of H2L acting as a Zn2+- selective fluorescence probe was investigated. Results showed that a good linearity (correlation coefficient 0.999) between fluorescence intensity and concentration of Zn2+in range of 4.0×10-6mol·L-1~ 4.0×10-5mol·L-1existed in H2L solution of 1.0×10-4mol·L-1. The minimum concentration at which H2L could detect Zn2+was 1.0 ×10–6mol·L-1. Co-existence of Cu2+, Ni2+and Mn2+would interfere the determination of Zn2+, but no influence by Na+, Mg2+, Cd2+and Pb2+.
Exergetic Assessment of Biogas Engine-Driven Heat Pump Systems for Using Sewage Resource
Authors: Li Xiao Ming , Wang Wen Xia , Wang Ai Jie , Wang Zhi Yao , Shi Yue
Published: February 2012

In order to improve energy utilization rate of biogas engine-driven heat pump (BEHP) systems for wastewater treatment plant, the exergy analysis is applied in this paper. The paper concludes the exergy losses and exergy efficiency of each equipment, and reveals the weak link of energy transformation of the whole system. According to the calculation of one example, the location of maximum exergy loss is the biogas engine-driven, while the location of minimum exergy efficiency is the compressor, which provides powerful theoretic references to improve and optimize BEHP systems for wastewater treatment plant.
A Novel Application of Combined Bio-Technologies on Chemical Synthesis-Based Pharmaceutical Wastewater
Authors: Chen Zhan Li , Huang Xiao Hua , Liu Zhen Zhong , Sun Xian Rong
Published: February 2012

This chemical synthesis-based pharmaceutical wastewater is treated by the process of hybrid hydrolysis acidification technique (HHAT) with anaerobic-low DO condition and the hybrid aerobic bio-technology consisted of alternate-flow biological reactor (ABR) and two-way-flow biological aerated filter (TBAF). The micro aerobic technology was employed in the HHAT and showed its advantages in refractory organic wastewater treatment. The largest plant in pharmaceutical wastewater treatment at home was built. The practice shows that the organics can be greatly removed and the effluent can reach the First Grade Discharge Standard which can be reclaimed with advanced treatment. The performance indicates that the combined bio-technologies are stable in pharmaceutical wastewater treatment.
A Novel Process Employing Dividing Wall Column and Double Effect Distillation
Authors: Xia Xin Tong , Wu Jia , Lin Long Yong
Published: February 2012

The energy saving, waste water reduction and economic performance of a novel process for purifying methanol, which employs dividing wall column and double effect distillation, was investigated by steady state simulation in comparison with two-column conventional distillation process and three-column double effect distillation process. Results showed that the novel process could reduce steam consumption by 34% comparing to the two-column process and had comparative ability in energy saving with three-column double effect process. Meanwhile it can reduce waste water by 20% and 20%, period for recovery of investment by 8.6% and by 5.1%, comparing to the two processes above respectively.
Geological Characteristics of the Dafulou Tin–Polymetallic Sulfide Deposits in Guangxi, South China
Authors: Cheng Yong Sheng
Published: February 2012

The Danchi mineralization belt is an important ore district in southern China. According to the tectonic characteristics, the Danchi mineralization belt could be devided into three mineralization belts, such as the east mineralization belt, the west mineralization belt and the middle mineralization belt. The Dafulou deposit, which belongs to the east mineralization belt, is located in the eastern flank of the NNW–SSE-trending Danchi anticlinorium. The key structures in the Dafulou ore district are the NW-trending faults, which developed parallel with the axis of the Dachang anticlinorium. In the Dafulou ore district, the Devonian stratum has a closed contact with the Sn–polymetallic deposits. In the Danchi mineralization belt, the granite belongs to alkali-calcium rock series or near to the alkali rock series. There are four different types of hydrothermal alteration, including silicification, carbonation, pyritization and pyrrhotitezation.
Ore Genesis of Caixiashan Pb-Zn Deposit in Middle Tianshan, NW China
Authors: Cao Xiao Feng , Lu Xin Biao , Liu Shen Tai , Zhang Ping , Gao Xiang , Liu Yue Gao , Hu Qi Tao
Published: February 2012

Caixiashan Pb-Zn deposit is the largest Pb-Zn deposit discovered in the middle Tianshan area. Examples of Carboniferous magmatic and tectonic activity are widely distributed. The ore bodies are controlled by EW trend faults, based on field observations. The main ore minerals are galena, sphalerite, pyrrhotite, pyrite and chalcopyrite, while quartz, sericite and calcite are the main alteration minerals. The ore also exhibits minerals zoning. In addition, the wide range of S isotopic composition, high temperature and moderate salinity of fluid inclusions, and good correlation of ore and wall rock Pb isotopes together with H, O, C isotopic compositions indicate mixing of magmatic origin and upper sedimentary rocks. Combined with high concentration of pyrite and pyrrhotite and some argentite, the Pb-Zn deposit may be controlled by the Hercynian orogeny, which controlled the EW-NEE faults and Carboniferous igneous rocks. The faults provided the channel for fluid transport and the igneous rocks provided heat and main source of the metals. When the fluid passed through metal-bearing rocks, it extracted Pb, Zn, Ag etc.. Interaction of the metal-bearing fluid with the brecciated and fractured marble caused the metals to be deposited. Thus the Caixiashan Pb-Zn deposit is a fault-controlled hydrothermal deposit.
Experimental Research on Contamination Dissolution-Releasing Characteristic of Coal Gangue in Soaking Operation
Authors: Xiao Li Ping , Li Yue , Zhang Lei
Published: February 2012

In order to investigate the dissolution-releasing characteristics of the pollutants in coal gangue, this article carries out soaking experiment of coal gangue in different wind erosion degree of XINQIU strip mine under different conditions. The results show that the main dissolution releasing pollutants of the coal gangue are total hardness (CaCO3), sulfate (SO42-), natrium (Na+), total dissolved solid (TDS), fluoride (F-), CODMn, and total iron (Fe). Chloride (Cl-), manganese (Mn) and zinc (Zn) occur in small quantities and heavy metals and arsenic (As) in trace concentration. The pH scale is nearly neutral. The higher the wind erosion degree is, the larger the quantity of the inorganic pollutants released by the gangue is. The quantity of the inorganic pollutants released by mixed coal gangue in high wind erosion degree inside the mountaintop is larger. Fluoride (F-), oxygen consumed (OC), and total Fe are released by fresh mixed coal gangue in higher concentration. Soaking time, solid-to-liquid ratio, acidity, granularity and stirring have a significant impact on the dissolution-releasing of the pollutants. The longer the soaking time, the smaller the solid-to-liquid ratio, the stronger the acidity, the smaller the granularity and the faster the stirring intensity is, the quicker the rate of the pollutants dissolution-releasing is and the larger the total quantity of the pollutants is. Which can accelerate the dissolution-releasing of the pollutants which is controlled by diffusion.
An Analysis of the Distribution of Arsenic Groundwater in Northern Suburbs of Zhengzhou, China
Authors: Li Hong Wei , Liu Jie , Wang Gang , Gao Jing
Published: February 2012

With the water supplies shortage and the change of national standards for arsenic requirements from 0.05 mg/L mentioned to 0.01 mg/L, a investigating for 72 water Wells in zhengzhou northern suburb has been far-reaching significance and urgent to clarify the situation of arsenic overweight. Firstly, the main reasons which lead to the arsenic pollution by natural sources or human activity have been demonstrated briefly. Then the monitoring history records for source Wells of arsenic levels excessive have been analyzed, by which a arsenic distribution map for the north suburb Wells has been painted. Furthermore, based on the map, sampling tests for typical Wells have been carried out simultaneously. Through the comparison, it is concluded : type C Wells whose depth is between 270.84 to 341 meters have no arsenic overweight. But type A and B whose depth is between71.7 to 92 meters has a serious arsenic overweight ,in which the highest arsenic is 0.487 mg/L. at last, a new suburb Wells arsenic level distribution map has been drawn which provides a reliable basis for investigation on migration transform rules of arsenic in the groundwater, establishment of scheduling solution for water source of the Wells and rigging new wells in the northern suburbs.
The Analysis of Factors Affecting Rock Strength of Sandstone
Authors: Liang Cui , Zhang Chao , Ma Nian Jie
Published: February 2012

Based on the microscope observation, the sedimentary characteristics of 20 groups sandstone samples were analyzed. All sandstones are taken from Shendong Coal Mine Area. The observation contents consist of rock constituents, grain size, textural and compositional maturity, cements and particle contact manner. Through the analysis of sedimentary characteristics and experimental determination, the research work reveals the influence factors of rock strength.
Molecular Dynamics Simulations of Coupling between Flow and Heat Transfer in a Nanochannel
Authors: Kou Zhi Hai , Bai Min Li
Published: February 2012

Simulation of microscale thermo-fluidic transport has attracted considerable attention in recent years owing to rapid advances in nanoscience and nanotechnology. The three-dimensional molecular dynamics simulations are performed for coupling between flow and heat transfer in a nanochannel. Effects of interface wettability, shear rate and wall temperature are discussed. It is found that there exist the relatively immobile solid-like layers adjacent to each solid wall with higher number density. Both slip length and Kapitza length at the solid-liquid interface increase linearly with the increasing wall temperature. The Kapitza length decreases monotonously with the increasing shear rates. The slip length is found to be overestimated by 5.10% to 10.27%, while Kapitza length is overestimated by 8.92% to 19.09% for the solid-solid interaction modeled by the Lennard-Jones potential.
Determination of Safe Mud Density for Soft Mudstone Formation in KI11-2 Structure
Authors: Li Zhong Hui , Lou Yi Shan , Zhu Liang , Zhang Chun Yang
Published: February 2012

Well KL11-2-1 is a wildcat well that located in KL11-2 structure, where sticking happened in position Ⅳ of Shahejie group, the accident happened again in the same position while drilling the sidetracked well KL11-2-1S on the base of Well KL11-2-1, Analysis reveals that the lithology in the place of the two sticking accidents is rufous mudstone. This kind of mudstone has the character of strong plasticity, swelling with water and very soft, the main reason of sticking is that the mud column pressure can not balance the soft mudstone creep pressure and the creep lead to borehole shrinkage. For solve the problem during drilling in this structure, this paper according to the characteristics of mudstone in this structure builted proper creep equation and creep mechanical computation module of soft mudstone, applied FLAC3D software to compute and analyze the creep characteristics, obtain borehole shrinkage rate plate with different depth and mud density, and the safe mud density that can inhibit the creep which lead to borehole shrinkage is given, the results show that for prevent the sticking accident occurred the safe mud density of the two sticking points of the well KL11-2-1/1S is 1.73 g/cm3 and 1.75 g/cm3.the results make significant sense in guiding the subsequent drill of the structure.
Research on Satellite Platform Vibration Compensation Method Based on Liquid Crystal Steering System
Authors: Li Xiang Zhi , Han Cheng Shan , Wen Ming , Zhao Qing Lei , Jiang Xiao Nan , Li Xiang Zhi
Published: February 2012

This paper presents the disturbance compensation scheme based on liquid crystal steering system according to the problem that satellite platform vibration affects the tracking and pointing accuracy in space optical communication. The mathematical model of liquid crystal steering system is built. For improving convergence speed, the adaptive controller based on posteriori estimation errors RLS lattice filter is designed, which not only achieves fast adaptation, but also reaches optimal steady-state disturbance compensation. Finally, the simulation results show that this control scheme is valid and feasible.
Fatigue Simulation and Analysis on Planetary Gear of Megawatt Wind Power Yaw Reducer
Authors: E Jia Qiang , Li Guang Ming , Zhang Bin , Dong Jiang Dong
Published: February 2012

The new type wind power yaw reducer has been virtually assembled in Pro/E for the operating conditions of the Megawatt wind power yaw reducer. The planetary gear contact model of the new type wind power yaw reducer has been built to simulate the change of the contact stress in the process of planetary gear operation with the interface of Pro/E and ANSYS. The results show that: the initial maximum contact stress of the meshing planetary gear is 395MPa and the maximum stress in the engagement process is 460MPa, but it is still less than the material yield limit of the planetary gear. The results also show that the fatigue life of the gear teeth is 125,800 times, the cumulative fatigue factor is 0.72501 by analyzing the fatigue loads and 42CrMo’s S-N curve of Megawatt wind power yaw drive planetary gear, so it can meet the design and operation requirements for the Megawatt wind power yaw reducer.
Test System for Mechanical Property of Geotextile Material Based on PCI-1714
Authors: Liu Zhi Gang , Sun Qi Xiao
Published: February 2012

A solution of intelligent test system for mechanical property of geotextile material which based on high speed data acquisition card PCI-1714 is introduced in this paper. Microprocessor and drive card PCI-1240 are also used to control and drive the test equipment. The article discussed in detail the system’s overall design, the hardware structure, software design, and process of data acquisition. Software is designed by Visual Basic 6.0. This paper research and implement on accurate measurement of mechanics performance of geotextile material.