bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress of Spherical Shell with Opening Nozzle
Authors: Luo Cai Xia , Guo Xiao Xia
Published: February 2012

To study the stress condition at the junction of the spherical shell with opening nozzle, using the finite element analysis, a finite element model is built in view of the same spherical shell joining a flatting nozzle and inside-stretching nozzles with different inner lengths differently. The maximum stress and stress distribution are got. All kinds of stresses are obtained by the total stress which is carried on linear processing. The result shows the inside-stretching nozzle can reduce the maximum stress in comparison with the flatting nozzle, mainly reducing the local membrane stress, but not the peak stress. The maximum stress falls with increasing the inner length of the nozzle to some extent, and beyond the extent, the maximum stress tends to reach a stable value basically without changing the inner length. The stress variation can effectively provide a reference for improving the strength of the spherical shell.
Supply Chain Network Equilibrium Model Based on Corporate Social Responsibility with Multicriteria under the Revenue-Sharing Contract
Authors: Huo Yan
Published: February 2012

This paper developed a three-level supply chain network equilibrium model with multi products and multicriteria based on corporate social responsibility through integrating the maximization of economic benefits, the maximization of social utility and the minimization of environment pollution under revenue-sharing contract. We analysed competitive behaviour of manufactures and retailers in a no cooperative competitive and described the multicriteria decision-making behaviour using Nash equilibrium theory and the weighted value function. Using product utility functions of brand differentiation and consumer preferences from product price, transaction cost and corporation social responsibility to analyse product choice in a market, and we developed the optimization conditions of each tier and whole network by variational inequality method. At last we illustrated the model with several numerical examples.
Research on the Improvement of MPS Coal Mill Loading Hydraulic System
Authors: Su Dong Hai , Ding Li Xuan , Feng Bing Ru , Xi Wu
Published: February 2012

This article introduces the design features of original loading mode of MPS coal mill and proposes that using technology of electro-hydraulic proportional to improve the loading mode. The original loading mode exists many defects. The improvement combines the hydraulic loading system with electronic technology so that the deficiencies of original system are solved and the automatic degree of coal mill loading mode is improved.
The Effect of Gallium on the Mechanical Properties of Superalloy K444
Authors: Xiao Xuan , Chao Zeng , Le Xu , Sheng Li Yuan , Guo Yong An , Zhou Lan Zhang
Published: February 2012

In order to figure out whether Gallium works in the superalloy K444, its composition had been modified by adding about 0.003 wt.% and 0.01 wt.% Ga, respectively. Mechanical properties of the modified superalloy K444 were investigated by using scanning electron microscopy (SEM) after standard heat treatment. Gallium had no significant effect on the tensile strength at room temperature and 900 °C. Gallium had a little effect on the tensile plasticity at room temperature and 900 °C. The plasticity is better in the modified K444 alloy containing 0.003wt. % Ga, however, the plasticity became worse in the alloy containing 0.01wt. % Ga. As for plasticity, the optimum Gallium content should be 0.003 wt. % for the superalloy K444.
Grain Refinement of Zn-50Al Alloy through the Addition of Zn-Al-Ti-C Master Alloy
Authors: Wang Z.Q. , Li W.J. , Yang Z.X. , Geng H.R. , Wang W.H. , Chen S.L. , Zhao W.T.
Published: February 2012

In this paper, two types of Zn-Al-Ti-C master alloy with different Ti/C ratios were produced throug a two-step method, characterized by XRD and SEM, and their refinement behaviors and mechanism in Zn-50Al alloy were studied. Both of the master alloys remarkably reduced the size of α-Al grains, impeded the dendritic growth and promote the equiaxed growth of α-Al grains in Zn-50wt.%Al alloy. The master alloy containing both TiC and dditional Ti in the Zn-Al matrix was found to have higher refinement ability than that containg only TiC. The refinement effect of both master alloys was greatly enhanced as the solidification temperature of Zn-50Al melt decreases. TiC particles were observed to be located at the center of α-Al grains and act as the nucleating substrate for α-Al. The decrease of melt solidification temperature and the presence of additional Ti atoms in the Zn-50Al melt cause higher melt supercooling, which further elevate the nucleating rate of α-Al grains on TiC particles and promote the equiaxed growth of α-Al grains.
Empirical Research on Effect of Managerial Discretion on CEO Pay: Monitoring Intensity as Moderator Variable
Authors: Zhang Chang Zheng , Gan Kai
Published: February 2012

The paper focuses on the special manipulation effect of managerial discretion on CEO pay considering the moderating role of monitoring intensity in China. The paper empirically indicates that the manipulation effect of managerial discretion on CEO pay does exist, and quantitatively describes the degree of the manipulation effect, which shows that the manipulation effect of managerial discretion on CEO pay significantly decreases. The results prove that monitoring intensity can restrain the manipulation effect of managerial discretion on CEO pay. Only under a certain monitoring intensity, will CEO pay not exceed the reasonable level too heavily.
Fire Robot's Operation Quality Base on Sperling Value
Authors: Hu Bin , Fang Shu , Song Na Na
Published: February 2012

The fire robot always bear high impact load due to the abominable fire environment and fatigue stress， this affects a lot on operation reliability and causes serious consequence. The operation quality of fire robot has been discussed in this paper, however, the kinetic energy and acceleration of vibration which have great influence on life cycle were analyzed, and Sperling Value, which definite by the acceleration and frequency, has been found for judging healthy condition of the robot. Furthermore, a set of method for measuring the vibration of robot has been proposed. The signal treated by Fourier Transform (FFT) and Sperling Value was calculated by a new algorithm. Experiments are made and the results demonstrated the practicability of the algorithm.
An Efficient Dispatching Rule in One-of-a-Kind Assembly Production
Authors: Li Ming , Cao Ji Hua
Published: February 2012

In this paper, we researched a one-of-a-kind assembly production system where every product is unique (i.e. each product has its unique tree-like process route) and arrives one by one randomly with the exponentially distributed inter arrival times. We proposed a new effective combined dispatching rule (LFD/RPS/CP rule) that is constructed by considering three factors: the latest finishing date (LFD), the remaining path size (RPS) and whether an operation is on the critical path (CP). We did many numerical experiments to compare the efficiency between the proposed rule and other rules that were reported in existing studies such as LFD rule and EDD rule. The performance analysis shows that the proposed dispatching rule is more effective in reducing the number of tardy products and total tardiness time.
Research on the Constructs of Small and Medium-Sized Enterprise Dynamic Alliance Information Platform Based on the ASP and Information Sharing
Authors: Wang You Fa , Li Ming Xing
Published: February 2012

The purpose of this paper was to solve the problem of constructing information platform for small and medium-sized enterprise dynamic alliance. According to the present situation of Chinese small and medium-sized enterprise informatization, the research on ASP(application service provider) model proposed to construct the small and medium-sized enterprise dynamic alliance information platform, expounded the advantages of ASP, proposed the small and medium-sized enterprise dynamic alliance information platform of information sharing mechanism. The formation of small and medium-sized enterprises of dynamic alliance effective operation had certain positive contribution. In this paper, the innovation of originality focuses on building small and medium-sized enterprise dynamic alliance information platform base on ASP model.
Management of Innovation in Research
Authors: Monnier Bernard
Published: February 2012

Innovation and Research have been associated for a long time. We use the term innovation to mean the process that transforms ideas into commercial value. The innovation path is quite long, difficult and complex from the production of new ideas to the final product. So, we need to define the meaning of innovation in research in order to maximize the chance to take the right way to a successful innovation. The association of the two words, innovation and research, is not really relevant. This document explains what is innovation in research and how to manage it. A specific doctoral training session is also described in order to improve innovation outcomes in industry-research organizations.
Research on the Composition and Management Strategy of Enterprise Logistics Cost in Supply Chains
Authors: Li Hui Lan
Published: February 2012

Taking the combination of the theory of the modern cost management and supply chains management as the key point and taking the whole supply chains as the target in the study, this thesis analyzes composition of logistics cost and further puts forward the means of optimizing enterprise logistics cost management such as inter-organizational cost management, unified cost accounting, target cost management measure, and integrated cost control.
Seepage through Earth Dams with Chimney Drain on Pervious Foundation
Authors: Djehiche Abdelkader , Amieur Rekia , Gafsi Mustafa
Published: February 2012

This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams
Research on the Auxiliary Working Hours of Locomotive Wheels Based on Feature and MOD
Authors: Sun Li , Qi Guang Wei , Ma Zi Qin , Wang Xiu Lun , Lu Peng
Published: February 2012

Because of the problem that how to formulate standard working hours quickly and accurately in the process of making time quota for enterprises at the present stage, we propose a concept which is a set of operating action and process feature. Considering the similarity of the attribute of process feature between the parts, and seeming the class of locomotive wheels as the object of research, we design a typical template of formulating standard process auxiliary processing time using MOD, this template faces process feature. In actual application, enterprises only have to modify the template slightly in view of the actual situation to meet the requirements.
The Optimization of Chain of Talents on the Development of Large Aircraft
Authors: Sun An Wei , Huang Yi
Published: February 2012

The aviation industry is a typically high-tech industry, which rallies a large number of high-tech achievements of mankind. Its distinct features are the high investment, long period and strong pulling function to industry. The development of large aircraft has currently become an important economic development project to promote the successful combination of technology and economy. The resources of talents are an important guarantee for this industry. First, this article studies the meaning of the talents and the chain of talents, on this basis, analyzes the chain of talents by means of SWOT, further explores optimization strategies of the chain of talents in order to serve for the large aircraft design talent strategies of our country.
Study on Preparation Technology and Finishing Performance of Magnetic Abrasive Grain
Authors: Hu Bin , Lu Ya Ping
Published: February 2012

Due to the low efficiency of magnetic abrasive finishing and the difficulty in the making of magnetic abrasive grain, this article compares three different ways of its making, i.e. hot pressed sintering, spark plasma sintering (SPS) and ab-adhesive bonding sintering. SPS is found to have a higher cost, but it makes up the deficiency in magnetic abrasive grain made either by hot pressed sintering or by felt, with high abrasion resistance, processing efficiency and better processing performance.
A Comparative Study of Ordinal Probit and Logistic Regression for Affective Product Design
Authors: He Zhen , Wu Du
Published: February 2012

Affective product design, which concentrates on customers’ affective responses and aspirations, is arousing increasing attention. In this paper, ordinal probit regression (OPR) is introduced into this field to discover mapping knowledge from design elements to customer affect, and a comparative study is always recommended between OPR and ordinal logistic regression (OLR) for available data to choose a better fitted model. The discovered mapping relations could facilitate the handling of affective information and assist the designer to make trade-off decisions. A case study of cell phone design was conducted. Four generic affective dimensions and six key product attributes of the cell phone were identified. OPR and OLR were applied successively to reveal the quantitative relations from design elements to customer affect. For the two models, five classes of indexes were compared. The findings show that OLR is superior to OPR to fit the collected data.
Study on Discrimination Pricing Model of Closed-Loop Supply Chain with Product Remanufacturing
Authors: Jiang Hong Wei
Published: February 2012

With awareness of environmental protection strengthens and constraints of regulations and laws to environmental protection increasing, more and more enterprises focus on the closed-loop supply chain management. Considering difference between new product and remanufactured product, this paper constructs closed-loop supply chain system with manufacturers recycling used products directly from the consumers based on game theory. The optimal pricing decisions and the optimal profit of centralized and decentralized closed-loop supply chain are obtained. It is found that the efficiency of decentralized closed-loop supply chain decreases by 25%. At last, the coordination mechanism is designed to solve the profit conflict in the decentralized closed-loop supply chain by the two-part tariff contract.
The Application of Different Model of Multi-Layer Perceptrons in the Estimation of Wind Speed
Authors: Culotta Simona , Messineo Antonio , Messineo Simona
Published: February 2012

Wind speed forecasting is essential for effective planning of wind energy exploitation projects. The ability to predict short-term wind speed is a prerequisite for all the operators of the wind energy sector. Consequently it is essential to identify an efficient method for forecasts. In this paper, the wind speed in the province of Trapani (Sicily) is modeled by artificial neural network. Several model of neural network were generated and compared through error measures. Simulation results show that the estimated values of wind speed are in good agreement with the values measured by anemometers..
The Point-Line-Surface Conceptual Model of the Area Logistics System - Based on the Interactive Development of the Manufacturing and Logistics Industry
Authors: Zhang Yan
Published: February 2012

Area logistics system is interactive with area economical structure. When designing the system of logistics, we should not only consider the optimization of logistics, but also area industrial structural features, and correlation of each factor within the area system as well. Based on the development of logistics and manufacturing, multiple factors are selected to establish a point-line-surface conceptual model of the area logistics system based on interactive development of the manufacturing and logistics industry.
A Task Conflict Detection Model of Logistics Distribution
Authors: Cao Qing Kui , Zhang Qian
Published: February 2012

Based on the time window in the vehicle scheduling problem(VSP), we propose the concept of time windows of delivery tasks(TWDT) in the distribution center, and describe the TWDT in a kind of three-tuple. Transferring time windows constraint of multiple tasks to a simple temporal constraint network, we simplify the problem of checking the time constraint of multiple tasks to the problem of checking the temporal constraint network’s consistency. According to the characteristic of delivery task and simple temporal constraint network, we proposed the model of time window conflict checking of delivery task.
Numerical Simulation and Response Analysis of Residual Stress Induced by Micro-Scale Laser Shock Peening in TiN Film
Authors: Ruan Hong Yan , Xie Xiao Jiang , Huang Shu , Zhou Jian Zhong
Published: February 2012

The ABAQUS software was used to analyze the residual stress of TiN film treated by the single point micro-scale laser shock peening (μLSP). In view of the multi-factor effect of μLSP, the response surface methodology (RSM) of Design-Expert software was utilized to analyze the influence of laser process parameters on the residual stress in TiN film, based on the Box-Behnken experimental design methods, as a result, optimal combination of the laser process parameters was obtained. The results showed that μLSP can transform the tensile residual stress in the TiN film into the compressive residual stress, the compressive residual stress was gradually increasing with the increased laser power density, when the laser power density was 8 GW/cm2, the maximum compressive residual stress of the film surface was up to -350.48 MPa. In addition, as the laser power density increased, the maximum compressive residual stress was moving away from the spot center. The optimal combination of the laser process parameters of μLSP was obtained by the RSM, the laser power density was 7.6 GW/cm2, laser spot diameter was 283 μm, and the number of shocking was 2 times. Simulation results of the average residual stress was -248.76 MPa, while the predicting result of regression model was -245.31 MPa, the error was just 1.38 %. The results showed that μLSP was feasible for improving the residual stress distribution of TiN film, and the RSM can effectively optimize the process parameters of μLSP.
Material Classification Based on SVM for Civil Aircraft
Authors: Cai Hong Xia , Wu Wen Wei
Published: February 2012

Inventory control plays a crucial role for civil aircraft in reducing production cost to improve the competitiveness. Aiming at the special requirements of aircraft manufacturing industry, we propose a solution to classify the material instead of ABC inventory control. In order to balance economy and reliability, we build a new criterion system to classify the aircraft material into nine categories. We investigate the Support Vector Machine (SVM) method to classify the material for it has been proved very powerful and effective in establishing classification model with small sample, nonlinearity, high dimension and local minima. The choice of corresponding parameters, the choice of the training set, and the choice of the SVM kernel highly affect the performance of the classification. The study was done to determine the appropriate kernel function and to optimize SVM’s parameters for the classification of civil aircraft materials. Research results prove the validity of the classification model by the software implementation.
An Integrated AHP-Entropy Approach for Spare Parts Supplier Evaluation and Order Quantity Allocation
Authors: Zhang Yin Lin , Liu Xiao Bing , Bo Hong Guang
Published: February 2012

This paper employs a two-stage method to the spare parts supplier evaluation problem and the order quantity allocation problem. In the first stage, we integrated approaches of analytic hierarchy process (AHP) and information entropy to evaluate the suppliers. In the second stage, the alternative suppliers’ weight scores obtained in the first stage are used as coefficients of the objective functions in a linear programming model. The model is developed to determine the optimal order quantity from the suppliers with consideration of the suppliers’ capacities and the buyer’s quality requirements of the products and service. A numerical example about the typical spare parts - ingot mold purchasing in an iron & steel company is presented to illustrate the approach proposed finally
A Novel IBE Based Authentication Scheme for Network Storage
Authors: Zhang Ya Kun , Tian Jia Yin , Yang Cheng , Zhang Yi Chun , Hou Fang Tian
Published: February 2012

Public Key Infrastructure (PKI) based or Identity-based Encryption (IBE) based authentication schemes are introduced into network storage systems recently. However, the schemes have unavoidable disadvantages:(1)the exchange of digital certificates are complicated.(2)the public key is long.(3)the transmission of private key is vulnerable. In this paper, we design a network storage authentication scheme using Double-PKG. The theoretical and experimental results show that it can ensure the confidentiality, integrity, availability and non-repudiation during data transmission and storage. Our scheme uses the double authentication infrastructure. And it can effectively protect the key transmission. The data encryption and decryption in experiments are relatively stable, so the overall scheme efficiency has been greatly improved.
Stochastic Demand Vehicle Routing Problem on Immune and Genetic Algorithm
Authors: Zhang Qun , Yan Rui
Published: February 2012

In this paper, stochastic demand vehicle routing problem and model are studied. Hybrid algorithm based on immune algorithm and genetic algorithm is proposed in order to gain solution. IA-GA use basic principles and processes of genetic algorithm, and includes the promotion-inhibition function and memory function of immune algorithm. The premature convergence problem of genetic algorithm is conquered, and we can get different offspring with improved crossover. Comparing experiment shows that IA-GA has better computing performance.
Angular Velocity Prediction of GFSINS Based on BP Neural Network
Authors: Duan Hai Qing , Zhu Qi Dan
Published: February 2012

Aiming at low precision for traditional angular velocity algorithms in GFSINS, a BP neural network algorithm without complex mathematic computation is put forward to calculate angular velocity. Based on a ten-accelerometer configuration scheme, the accelerometer output, sample interval and fixed position are chosen as input, angular velocity got by lognormal algorithm is chosen as output, and 5000 sample data is trained in the several conditions with different hiding layers, neural cells and training steps. Then a three-layer BP network model with 30 hiding layer neural cells is built. Finally, the angular velocity is predicted in real time by the model. Results show that network has strong adaptive capability and real time, and compared with lognormal algorithm, prediction time is almost equal, but prediction precision of angular velocity is nearly improved by three times.
The Construction of IC Service and University Library’s Café
Authors: Yang Min
Published: February 2012

With the information era’s coming, readers’ requirements and behaviors have changed, so the university library need to innovate traditional ways of management and service. The establishment of cafe in the library caters to the reading requirements of readers; it is a one-stop service including the learning support, culture and leisure, intercourse and collaboration. The background of university library’s cafe is analyzed briefly; its functions and constructing elements are explained in detail. The university library cafe will be the information acquisition, knowledge learning and cooperation exchange place which has comfortable environment, improved equipments and centralized functions.
A Model of Transinet Response of Semiconductor GAS Sensor Considering Temperature Dependency of Carrer Mobility
Authors: Fujimoto Akira , Kita Masamitsu
Published: February 2012

A model of transient response of semiconductor gas sensor was improved by considering temperature dependency of carrier mobility in SnO2 gas sensor. The model is useful for analysis of transient response of the sensor. Improvements of accuracy of the model have been desired to express the difference of the calculated sensor outputs between the kinds of gases for classifying the kind of gases. The model which considers the temperature dependency of carrier mobility has been newly constructed. The sensor output calculated by new model was a close result by the experiment. Gas classification will be realized by using the model together with activation energy dependence of the sensor output.
A New Fast Multi-Source Remote Sensing Image Registration Algorithm
Authors: Zhang Yong Mei , Ma Li
Published: February 2012

Aiming at the registration of multi-sensor remote sensing images, a fast and effective image registration algorithm method is presented. In this algorithm, using SIFT to extract feature points, remove mismatching points through Delaunay triangulation, and introduce distance calculation into the determination of homologous control point pairs. The effect of image registration algorithm is evaluated by subjective and objective method. Experiment results show the proposed algorithm can accurately register multi-spectral and panchromatic images with some shift, rotation angles and back-ground noises, and it can inrease the speed and precision of registration.
Registration for SAR and Optical Image via Cross Cumulative Residual Entropy and Ratio Operator
Authors: Zhang Yong Mei , Li Jie Qiong
Published: February 2012

Optical and SAR images have different imaging modes and pixel expression formats, which caused much difficult for image registration. The paper proposes a registration algorithm combined Ratio gradient and Cross Cumulative Residual Entropy (CCRE) aimed at solving the problem of SAR image speckles. Compared with other traditional methods, the experiment results show that the CCRE combined with Ratio operator registration method performs satisfactorily in SAR and optical image registration and provides a significant improvement on the registration accuracy over the other algorithm
Power Transformers Condition Assessment of GI Simangkuk Switchyard Sumatra Interconnection in Indonesia
Authors: Sihite Josep Franklin , Kohda Takehisa
Published: February 2012

The electricity needs of Indonesia grow an average 10% each year. Therefore, PLN (Perusahaan Listrik Negara) as the only power utility business in Indonesia, has a master plan to develop new power plant, switchyard and transmission system. One of the new developed systems is GI Simangkuk switchyard of Sumatra interconnection system. This switchyard is prepared to improve reliability of Sumatra interconnection system. This site utilizes power transformers of 275 kV. Power transformer is one of the main equipments in power systems. When a failure occurs in a power transformer, the whole system will be failed and the electricity could not be delivered to customer. Each utility has to assure their reliability in order to maintain electrical power system stability by assessing transformer condition. There is an increasing need for better diagnostic and monitoring tools to assess the condition of transformers. Modern power transformers are equipped with software and computer system control. The reliability of this computer systems are needed to evaluate for assurance of system safety. This paper describes the need of assessment and maintenance of power transformers such as outages effect of failures, high cost of maintenance and replacement, increase of world demand, aging effect and used of old transformer, and computer protection system failure. Monitoring and diagnostic methods of transformers assessment have been developing in recently years. They can be separated into traditional and non-traditional methods that have been used in many years and are still in research stage. In this paper we propose a new approach in order to assess power transformer condition by using fault tree analysis.
Multivariate Conditional Copula-GARCD-JSU Model and its Application
Authors: Jiang Cui Xia , Xu Qi Fa , Zhang Shi Ying
Published: February 2012

Generalized autoregressive conditional density model provides a useful tool for simulating the probability density function of financial asset return. It is essential for describing the dynamic character of financial asset return comprehensively. Copula function can be used to combine some marginal distributions together. Based on Copula function, multivariate conditional Copula-GARCD-JSU model, a new model, is proposed in the paper. Fortunately, the famous “dimension disaster” in multivariate GARCD model can be overcome by the new model. Furthermore, the estimation and test method for the model are discussed in detail. In empirical analysis, the new model can not only be applied to describe the dynamic character of individual market, but also to simulate the dynamic relation between them.
Synthesis of Fine Co/ WC Composite and Application to Supersonic Plasma Spraying
Authors: Yang Lian Wei , Wang Rui Jie , Dong Yun , Lin Xiao Ping
Published: February 2012

Co/ WC composite powders (with 10 wt% content of Co) were synthesized by direct mechanical grinding in a rotary-vibration mill. The powders with different mill time were evaluated. WC and WC/Co composite coatings were prepared by supersonic plasma spraying. The results showed that the milled powders consist of composite particles that were formed in the first 2h of milling. Longer milling times improve the distribution of phases inside the composite particles. The formation of the composite particles involves sequential steps of deformation, fragmentation, cold welding, work hardening and piercing of particles of the hard phase in the soft phase. X-ray spectra of the sprayed coating are shown that only very weak W2C and Co6W6C peaks are observed. Compared with WC coating, the Co/ WC coating is denser, and less large pores within composite coating.
Effect of Roasting on Pore Properties of Fly Ash
Authors: Chen Jun Tao , Ding Shu Fang , Bai Chun Hua , Wang Hui Ping , Xu Yan
Published: February 2012

Fly ash roasted by different temperature, XRD analysis of fly ash after roasting, specific surface area and pore properties of fly ash roasted before and after were tested. Results showed that roasting influenced significantly on pore properties of fly ash; Specific surface area, pore volume and amount of middle pore of fly ash increased with roasting temperature increased , then reached maximum at 700 °C, and decreased with roasting temperature increased.
Flotabilities of Iron Minerals and Quartz in Flotation System of Dodecylamine
Authors: Li Li Xia , Yin Wan Zhong , Yu Xiao Long , Wang Cheng Liang , Tao Shi Jie
Published: February 2012

During practical production, siderite has an influence on flotation efficiency to hematite and magnetite. In flotation system of dodecylamine, this paper studied the flotation properties of single minerals such as magnetite, martite and quartz firstly. On this basis, the influence of siderite to flotation efficiency of martite-quartz and magnetite-quartz mixed ores was discussed. The result shows that siderite will seriously effect on the flotation efficiency of hematite (magnetite)-quartz mixed ores. Increasing the amount of starch will weaken the impact of siderite to some extent.
Flotation Separation of High Sulfur Lead-Zinc Ore
Authors: Yuan Zhi Tao , Yu Xiao Long , Liu Li Ping , Wang Cheng Liang
Published: February 2012

According to the refractory lead-zinc ore properties with high pyrite, the experimental studies were conducted on floatation reagent conditions and closed circuit tests for comprehensive recovering of all types useful minerals. In comparison to the test results of different process flowsheets and different types of flotation reagents, adopting prior flotation lead (Pb)—Zn selective flotation (reagent removal and regrinding of rough concentrate)—S-selective flotation with Zn-tailings. The closed circuit tests were achieved: the grade of lead concentrate was 50.55% with a recovery of 92.25%; The grade of zinc concentrate was 40.12% with a recovery of 85.82%; The grade of sulfur was 48.58% with a recovery of 56.59%; The tailings grades of lead, zinc and sulfur were 0.27%, 0.31%, 3.90% respectively.
Preparation of Modified Mordenitem and Application in Processing Mine Drainage
Authors: Meng Fan Na , Zhao Guo Gang , Zhang Hai Jun
Published: February 2012

Mine drainage is a widespread environmental problem associated with both working and abandoned mining operations, resulting from the microbial oxidation of pyrite in presence of water and air, affording a solution that contains toxic metal ions. The present study aimed at evaluating the use of low-cost modified mordenitem to remove heavy metals ions from mine drainage. We elucidate the important parameters (including the pH, temperature, contact time, particle size and dosage) responsible for the removal the heavy metal ions. In addition, selectivity of modified mordenitem for metal removal was, in decreasing order, Pb2+> Cd2+ > Cu2+ > Zn2+. Based on these results, the use of these materials has the potential to provide improved methods for the treatment of mine drainage.
Reduction Process of High Phosphorus Oolitic Hematite
Authors: Han Yue Xin , Sun Yong Sheng , Gao Peng , Li Yan Jun
Published: February 2012

The changing characteristics of iron mineral along with the reduction time in reduction of a high phosphorus oolitic hematite by carbon were discussed in the paper. The grain growth of metallic iron was investigated in detail. The results showed that the iron mineral in reduction of the oolitic hematite changed as Fe2O3→Fe3O4→FeO→Fe, and finally was reduced to metallic iron. As the reduction time elongated, the small grain of metallic iron gathered toward the larger one and grew up. The metallic iron existed in the reduction products in the form of larger grains of metallic iron.
Research on Copper-Sulphur Separation of Dongguashan Copper Ore
Authors: Wang Huai , Wang Ze Hong , Han Yue Xin , Bai Li Mei
Published: February 2012

Dongguashan copper ore is one of a complex copper sulphide ores containing various metal minerals in Tong ling area. In this paper, in order to simplify the complexity of traditional lime process, the process of Cu-S bulk flotation-regrinding-separation is discussed and exploited. A good quality of Cu concentrate and S concentrate are obtained respectively after Cu-S separation by using calcium hypochlorite as depressant. A good separation results are derived through this process, and high efficiency of calcium hypochlorite used as depressant and feasibility of the process are confirmed.
Study on Deep Reduction and Efficient Separation of Lingyang Iron Ore
Authors: Li Yan Jun , Liu Jie , Han Yue Xin , Zhang Shu Min
Published: February 2012

The test for deep reduction and efficient separation of Lingyang iron ore from Linjiang that cannot be separated and utilized by any conventional mineral processing technology was conducted in the Laboratory, and the research results showed that iron from Lingyang iron ore was recovered effectively. In this paper, the effect of reduction temperature, time and coal content on reduction was analyzed, and the process of deep reduction and efficient magnetic separation was investigated. Furthermore, on such optimum conditions of deep reduction as reduction temperature 1275°C, time 50min, and coal content 40%, the reduction products were separated in the flowsheets of magnetic separation after fine grinding and the iron powder products with iron grade 79.58% and recovery 62.77% were obtained.
Study on Recovering Zinc from Gossan
Authors: Yang Jin Lin , Ma Shao Jian , Mo Wei , Feng Jin Peng , Su Xiu Juan , Wang Gui Fang
Published: February 2012

In this paper, the conventional physical separation method such as flotation, gravity separation, magnetic separation, alkaline leaching and sulfuric acid leaching were studied. The effects of grinding fineness, amount of agent, magnetic intensity, roasting temperature, roasting time, the leaching agent and leaching time on the leaching of zinc were investigated, respectively. The results show that the leaching rate of zinc is below 50% in the conventional alkaline leaching, and the leaching rate of zinc is below 85% and the leaching rate of iron is above 35% in sulfuric acid leaching. Compared with XRD pattern of the raw ore, the different diffraction peaks of smithsonite is off in alkaline leaching products. In sulfuric acid leaching, the different diffraction peaks of smithsonite are off in the leaching products when sulfuric acid concentration is less than 60 g/L. After 60 g/L, the different diffraction peaks of smithsonite and siderite are off in the leaching products.
Preparation of Poly(Phenylene Sulfide)/Carbon Nanotubes Composites
Authors: An Yu Liang , Zhang Chen , Yuan Xia , Hou Qing Yi
Published: February 2012

The poly(phenlene sulfide)(PPS)/carbon nanotubes (CNTs) composite was prepared by plastic pressure moulding of mixture of PPS and CNTs mixed by ball mill. The structure, elcctrical conductivity and mechanical properties of the composite were studied in detail. The effect of content of CNT on mechanic properties and conductivity of composite was carried out, repectivly. The SEM characterization indicates that CNTs were dispersed uniformly in the PPS matrix, which leads to a remarkable improvement in mechanical properties of composite. Compared with the those of neat PPS, both the tensile strength and impact strength of the composite increase with content of CNTs. and the addition of CNT increases the conductivity of the composites dramatically.
Preparation of Single-Walled Carbon Nanotubes from Starch by Arc Discharge
Authors: Yuan Xia , An Yu Liang , Zhang Chen , Sui Hong Chao
Published: February 2012

Single-walled carbon nanotubes (SWNTs) have been successfully prepared from starch by arc discharge technique. The SWNTs products were characterized by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The growth mechanism of the SWNTs was discussed in terms of the starch. The results demonstrate that starch is one of the suitable precursor for making SWNTs by arc discharge method.
Preparing CNT/UHMWPE Composite and it’s Electrical Property Study
Authors: Hao Xiang Yang , Hua Xiao Ying , Lu Jian , Gai Guo Sheng , Kong Xiang Ming
Published: February 2012

Composite particles with ultra-high molecular polyethylene (UHMWPE) core and carbon nanotube (CNT) shell were produced by an impact coating process, and molded into conductive polymer composites. Morphology of these composite particles was observed and the electrical behavior of these molded composites was measured. UHMWPE particles were very well coated by CNT, and conductive networks of CNT were formed after molding. These conductive polymer composites with low loadings of conductive filler exhibit lower room-temperature resistivity, and volume resistivity decreases with temperature on the whole. This is because of the CNT distribution is uniform in a macroscopic view but is oriented in a mesoscopic view. Thermionic emission of CNT is strong in polymer composites produced by this process. A related mechanism is discussed.
Synthesis of Ethyl Acetate Catalyzed by Inorganic Salt
Authors: Tang Bao Hua
Published: February 2012

Ethyl acetate was synthesized using inorganic salt as catalyst. The catalytic syntheses of Ethyl Acetate using NaHS04, Sncl2 and Fecl3 as catalysts were introduced. It showed that Sncl2 was excellent catalysts for synthesis Ethyl Acetate with higher yields and the catalyst can be reused, and the reaction does not cause pollution.
Model Test and Finite Element Analysis for the Pylon of the Jointed Pylon Cable-Stayed Bridge
Authors: Xu Zhou Yuan , Zhao Ren Da
Published: February 2012

In order to roundly investigate the whole structural behavior of the jointed pylon of cable-stayed bridge, 3:40 scaled-down model test and space finite element analysis （FEA） were presented by taking Yongjiang super-large bridge as an example. Test objective, model design principle, the ratio of similarity, test cases, loading method and the strain test point arrangement were introduced in detail. By comparison of two unfavorable cases, most test data were quite agreeable with the theoretical data, which verified the design concept. The results indicate that the whole resistant behavior is well and the structure is safe and reliable. FEA which is conducted using commercial program ANSYS is a reliable method for predicting the complex stress distribution in the jointed pylon structure.
Modeling of THMs and HAAs Formation in Distribution System upon Chlorination
Authors: Ma Rong , Lu Xi Wu
Published: February 2012

Seasonal variations of trihalomethanes (THMs) and haloacetic acids (HAAs) were investigated within distribution systems of the Yangtze river treatment plant in Nanjing City (China).The investigation was based on one year sampling program, undertaken from the fall and winter of the year 2007 to the spring and summer of the year 2008. A multiple linear regression model was developed to predict THMs and HAAs concentrations in distribution water. Routinely measured parameters including free residual chlorine, ultraviolet light absorbance at 254 nm (UV254), temperature, pH and NH3-N in distribution water was used to develop the model for the prediction of THMs and HAAs. The developed models provided satisfactory estimations of the concentrations of THMs and HAAs and the model regression coefficients of THMs and HAAs are 0.90 and 0.87, respectively. Further, the Durbin-Watson values confirm the reliability of the two models. The results indicate that variations of free residual chlorine, ultraviolet light absorbance at 254 nm (UV254), temperature, pH and NH3-N can described the formation of THMs and HAAs in distribution water by the multiple linear regression technique.
Effects of N/P Atomic Ratio on the Growth of Alexandrium Tamarense at Various Initial Phosphate Concentrations
Authors: Wen Shi Yong , Zhao Dong Zhi , Song Li Li , Long Hua
Published: February 2012

To reveal the relationship between nutrient input and red tide outbreaks, the effects of N/P atomic ratio on the specific growth rate of Alexandrium tamarense is analyzed under various initial phosphate concentrations in laboratory cultures. The results show that both the cell density and the specific growth rate of A.tamarense first increased when the N/P atomic ratio ≤ (N/P)opt and then decreased when the N/P atomic ratio ≥ (N/P)opt in low-P-grown cultures, followed by those in medium-P-grown and high-P-grown cultures. And the highest cell density in low-P-grown, medium-P-grown, and high-P-grown cultures is 1776×104, 4094×104 and 6891×104 cells/L, respectively. The maximum specific growth rate is 4.022, 5.307 and 9.672 d-1, respectively. It seems that the higher the initial phosphate concentrations, the greater the probability of red tide outbreaks.
Character and Model of Anaerobic Granular Sludge Formation in the Sanitary Landfill
Authors: Wang Jin , Zhang Zhen Jia , Chi Li Na
Published: February 2012

The microbiological structure characteristic and the particle diameter distribution of different sludges (aerobic excess sludge, sludge from sanitary landfill digested for one year, and granular sludge of pilot-scale expanded granular sludge bed (EGSB) reactor after 400 d of operation) were analyzed through scanning electron microscopy (SEM), transmission electron microscopy (TEM) and sieve. SEM of granules showed that the microbiological structure of the sludge from different sources had differences. But TEM proved that granules of EGSB and landfill both had similar kind of bacterial species i.e. Methanosarcina bacteri sp. There were obvious differences in the transformation trend of size distribution between different granular sludges. Three-step Model for the anaerobic granular sludge formation in sanitary landfill was put forward.
Comparison of the Temporal Heterogeneity of Soil Moisture of Different Ecosystems at Red Soil Hillside Fields
Authors: Chen Xin Fang , Chen Xi , Ju Win Min , Ren Li Liang , Zhang Dan Rong , Zhang Zhi Cai , Guan Bao Hua , Zheng Jian Wei , Liang Cheng Yuan
Published: February 2012

This paper investigates the differences in the temporal heterogeneity of soil moisture between natural restoration ecosystem without disturbance (named as eco-1), restoration ecosystem with disturbance (named as eco-2) and shrubs ecosystem (named as eco-3) in red soil hillside fields. The probe soil moisture measured at 20 and 40 cm below the soil surface Hydrosense Portable Time Domain Reflectometry (TDR) system. The results showed that: (1) Daily measurements during a growing season showed significantly temporal interactions between vegetation and water. Soils under eco-2 (restoration ecosystem with disturbance) and eco-3 (shrubs ecosystem) were wettest at the start of the growing season but dries at the end; (2) The coefficient of variation of soil moisture content over time during the growing season was significantly higher in eco-2 than in eco-1, and at two depths beneath the soil surface (20 and 40 cm).
The Pb-Zn Deposits and Mineralization during Cambrian in Chongqing Area of Yangtze Platform, China
Authors: Xia Min Quan , Xu Gui Wen , Da Xue Juan , Chen Lan
Published: February 2012

This paper presented the Pb-Zn deposits characteristics in southeast Chongqing. The Pb-Zn deposits occurred in Lower-Middle strata with develop the dolomites, limestones as ore-bearing host-rocks. They are veined, stratifed, stratoid, and lenticular in shape and locally pinch and swell with dominant ore minerals of sphalerite, galena, and pyrite . the Pb-Zn ore deposits grade changed from 0.32% to 7.06% for Pb and 4.21% to 14.29% for Zn. The Gaodongzi orebody has highest concentrations of Pb with 7.06% record and Zn with 14.29% record. The tectonic setting, ore-host rocks, wall-rock alternation, and mineral composition will control the Pb-Zn deposits distribution in Chongqing area.
Lead Isotope of Sulfide Minerals from Dachang Ore Field of Guangxi (South China): Characteristic and Implication
Authors: Cheng Yong Sheng
Published: February 2012

In the Danchi mineralization belt of Guangxi province, south China, the Dachang tin-polymetallic ore deposit is one of the largest Sn ore deposits in this world. But about the genesis and the ore source, there have been some disputes. In terms of the Dafulou deposit, the mineralization model and deposit mechanism is rather illegibility. By analysing and comparing the lead isotope of three ore deposit (the Changpo, the Lamo and the Dafulou), it show that the correlations of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb of sulfide minerals demonstrate obvious excellent linear relation. So, it is also suggested that the eastern mineralization belt, the middle mineralization belt and the western mineralization belt shared the same ore source. And, according to the features of no.22 ore body, the Dafulou deposit is characterized with the characteristics of the Sedimentary Exhalative Deposit (SEDEX).