bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Adaptive Controller of Brushless DC Motor Based on Fuzzy Genetic Algorithm
Authors: Chen Ya Juan , Zhang Yue Hong
Published: September 2014

In this paper, an adaptive fuzzy PID controller based on genetic algorithm is designed. Brushless DC motor uses double closed loop control system. The adaptive fuzzy PID controller based on genetic algorithm is applied to outer ring speed ring, and PI controller is applied to inner ring. The simulation results show that, the designed brushless DC motor control system based on genetic algorithm optimization has a short rise time and no overshoot, small steady-state error and other advantages. And the system has strong robustness and adaptability.
Topological Structure and Spanning Trees of Rectangular Growing Network Models
Authors: Liu Xia , Yao Bing , Zhang Wan Jia , Chen Xiang En , Zhang Xiao Min
Published: September 2014

Fractals in building network models are objects which appear similar (at least in some statistical sense) at every lengthscale. We focus on produce the rectangular growing network models by constructive operations based on fractals, and show the scale-free behaviors of our models. We, also, try to find those nodes like “hubs” in the models by spanning trees having maximal leaves.
Research on Cloud Computing Strategy Based on Security Model
Authors: Liu Si Ping
Published: September 2014

Based on the threats of cloud computing security, combined with the principle of private cloud computing, this paper introduces the variable dimension fractal theory into the cloud computing and security policy model, and puts forwards multidimensional data model C2MDSM of the cloud computation. The model can protect 2D and 3D protection of user information in a private cloud space. Through the 3D fractal it greatly improves the user use of cloud resources, and improves the security of information, which realizes the true sense of the reasonable distribution for cloud resources. In order to verify the validity of the mathematical model and the algorithm designed in this paper, we use the MATLAB software to draw 2D and 3D fractal, and obtain the number of cloud users, security level and calculation residual results. It provides the technical reference for the research on cloud computing.
Research of Large-Scale Logistics Management Optimization Model
Authors: Lu Lin , Xu Sheng Ming
Published: September 2014

The process of large-scale logistics management, logistics vehicle scheduling is the core content in logistics management process. In order to achieve optimal scheduling of vehicles, saving transportation costs, and taking into account the defect of high computational complexity exists in traditional vehicle scheduling algorithm, which is not practical for application, this paper proposes an improved vehicle scheduling optimization model. Experimental results show that the new algorithm is applied to large-scale logistics management optimization model, which can improve its practicality and effectiveness.
Multi-Secret Sharing Visual Cryptography Scheme Based on XOR Algorithm
Authors: Ha Yan Yan , Ji Shuai , He Wen Cai , Zhang Yao
Published: September 2014

XOR algorithm can be used to improve the recovery effects of visual cryptography scheme. In this paper, we present a multi-secret visual cryptography scheme by using the matrices of the (k, k)-VCS. We can reveal multiple secret images perfectly by the XOR algorithm and shifting operation on the shares. The visual qualities of recovered images are ideal without any pixel expansion.
A Sufficient Condition for Low-Rank Recovery via Iterative Hard Thresholding Pursuit
Authors: Cui Li , Liu Lu , Huang Xue Zhi
Published: September 2014

In this pape, we propose a matrix Iterative Hard thresholding pursuit algorithm for low-rank minimization that extends Foucart's Hard Thresholding Pursuit (HTP) algorithm from the sparse vector to the low-rank matrix case. The performance guarantee is given in terms of the rank-restricted isometry property and a low-rank solotion is presented. The numerical experiments empirically demonstrate that, although the affine constraints does not satisfy the restricted isometry property in matrix completion, our algorithm also recovers the low-rank matrix from a number of uniformly sampled entries and is more efficient compared with SVT and ADMiRA.
Study on Scheduling Algorithm of Field Maintenance Service for Agricultural Machinery
Authors: Zhao Jing , Hu Yao Guang , Wen Jing Qian
Published: September 2014

According to the characteristics of maintenance service for agricultural machinery, the combinational optimization problem about uncertain number and travel routes of maintenance vehicles was studied. In order to improve the quality of maintenance service for agricultural machinery while reduce the total cost of maintenance service, a mathematical model of maintenance vehicles scheduling was constructed by considering both the constraint of customer’s need and maintenance cost. To solve specific problem of predicting the number of maintenance vehicles, a scheduling method based on genetic algorithm was proposed, including new chromosome coding scheme about uncertain number of vehicles and new crossover and mutation strategies that are used to ensure the diversity of the population. Then the coordination of customer satisfaction and maintenance cost was achieved by punitive action. Finally, compared with different cost parameters in the numerical case, the algorithm performance was analyzed. The experiment results showed that the algorithm could provide effective advices to agricultural machinery manufacturing enterprises about the number and routes of dispatching maintenance vehicles in field maintenance service especially in real-time environment.
Design and Implementation on Sina Micro-Blog Client Based on the Android System
Authors: Shi Chun Yang
Published: September 2014

This design, based on Android mobile development platform, uses Java language development, making the system have good portability and scalability. Sina micro-blog Android SDK provides third-party twitter application with API invoking service, in which document is easy to use, making the third-party micro-blog client not need to understand the complex validation and API calls process and share text or multimedia information to sina micro-blog.Micro - blog, namely the micro blog, is open Internet social services with the rise of Web 2.0, which allows users to update their status with brief text at any time and place, the length of each message within 140 words, and supports the publication of the images, audio, video and other multimedia. Each user is not only the creator of the micro content, is also the disseminator and distributors of micro content. Compared with the traditional blog, the admittance threshold of micro-blog is lower, and the originality and interactivity of instant messaging are stronger.Android is open source mobile operating system developed by Google and based on Linux platform. It includes operating system, user interface and applications-- all the required software in the mobile phone work. Fast development of the Android operating system mainly profits to a free, open source and good industry operating strategy.
Improved Median Filtering Algorithm Based on FPGA
Authors: Wen Chang Bao , Xue Cheng Fei , Yang Tiao , Li Yan Ming
Published: September 2014

Aiming at the loss of image boundary information and the blurred image details in the classical median filtering algorithm, the improved median filtering algorithm based on FPGA (Field Programmable Gate Array) is proposed. In the improved median filtering algorithm, the borders mirroring and threshold comparing are adopted, and the loss of the image boundary information is lowed and the detailed information of image is preserved. The improved median filtering algorithm based on FPGA consists of the filter template generating module, the median grayscale computing module and threshold comparing module. The experimental results show that that the NMSE (normalized mean square errors) of the image filtered with the improved median filtering algorithm is lowed by 25.6%, and the operating efficiency is improved by 16% comparing with the classical median filtering algorithm.
Performance Analysis and Implementation of SISO Iterative Receiver for SCCC
Authors: Li Lin Tao , Zheng Peng , Hao Jin
Published: September 2014

Serial concatenated convolutional codes (SCCC) have gained a great interest in recent years for outperforming PCCC at high SNR and lower error floor. In this paper, the BER performance of SCCC based on different decoding algorithm such as Log-MAP algorithm, Max-Log-MAP algorithm and improved Max-Log-MAP algorithm are investigated. In order to achieve a flexible high throughput, low complexity and multi-rate decoding process, some improved methods are proposed.
Research on Tool Materials for High-Speed Cutting
Authors: Xie Guo Ru , Xie Wei An
Published: September 2014

The high-speed cutting is an advanced manufacturing technology with efficient, high quality and low consume, it is also the development direction of cutting. The concept and characteristic of high-speed cutting is discussed. The performance and application of the major tool materials (such as ceramic cutting tools, diamond tools, CBN tools, coated tools) for high-speed cutting is described. At last, the paper discusses the developing prospect and research direction for high-speed cutting tool materials.
Posture Alignment and Finishing System for Aircraft Wing
Authors: Zhang Hong Shuang
Published: September 2014

A novel posture alignment system based on 3-DOF locators is presented to meet the finishing need of big part such as wing after assembly. The system includes three locators for posture alignment and auxiliary clamping devices for auxiliary clamping. The structure and basic principle of device and the posture alignment principle are introduced in details. The application show the system could meet the posture alignment and finishing need of big part such as wing and provide a reference for aircraft assembly and fabrication.
Experiment on Bending Bearing of Damaged Old Wooden Beams Strengthened with CFRP
Authors: Zhang Xun Zhong , Zhu Yu , Jia Bin
Published: September 2014

This paper completed a reinforced test of eight aging damaged old wooden beams of CFRP, studied the different layers of the CFRP reinforced rectangular failure pattern of the old wooden beams, the bending bearing capacity, load-deflection curve. The results show that reinforced aging old wooden beam repaired with CFRP not only improve the flexural bearing capacity and its failure mode changed from brittle tensile damage to compression of ductile damage.
Geometry Error Parameters Identification Methods of 3-Coordinate CNC Machine Tools
Authors: Fan Jin Wei , Liu Yong Jun , Mu Dong Hui
Published: September 2014

It is inevitable that the mechanical part has error when machining. To increasing the machining precision and decreasing the shape and position error, error compensation is one way. The geometry error parameter is necessary when the error compensation model is founded and the compensation data is calculated. The common measuring and identifying methods are introduced in this article. Their mathematic models and solutions are listed and their merits and drawbacks are compared. This method has been applied in CNC error compensation and the effect is advisable.
A Green Enriching Process of Mn from Low Grade Ore of Manganese Carbonate
Authors: Sun Da , Li Mao Lin , Li Can Hua , Cui Rui , Zheng Xia Yu
Published: September 2014

The ammonium salt roasting method is proposed to enrich and recover Mn from low grade ore of manganese carbonate. It included a process of mixing the ore with NH4Cl by ball milling, roasting this mixed ore in pipe stove at 450°Cfor one hour and leaching the calcine with hot water to obtain MnCl2solution. Further, manganese is precipitated by NH3·H2Oand CO2released from roasting process, washing and drying to get concentrated manganese ore. The NH4Cl obtained by vaporizing the filtrate solution can be reused for the ammonium salt roasting process. The result indicates that Mn recovery rate can be reached to be more than 90%. This method is considered to be a green chemistry process to enrich and recover Mn from low grade ore of manganese carbonate.
Recovering Iron from Red Mud with High Gradient Magnetic Separator
Authors: Zhang Peng Xiang , Zhou Xing Long , Shang Guan Chang Cheng , Bai Xu
Published: September 2014

Based on the XRF analysis of red mud, the Muti-element analysis of red mud and the phase analysis of iron, high gradient magnetic separators were used for recovering iron from red mud. Magnetic field intensity, magnetic media, velocity of flow and frequency were researched. Magnetic field intensity as 0.85T, Magnetic media as 2.0mm, velocity of flow as 8L/min and frequency of stroke as 200/min, at this condition, the grade of iron concentrate is 44.56% and the recovery is 73.69%.
Motor Control System Based on DSP Four-Bridge Arm Topology
Authors: Feng Juan
Published: September 2014

This paper proposes a space vector motor control system based on DSP four-legged bridge topology A three-dimensional space vector control principle based on four-bridge arm three-phase inverter is introduced with a MATLAB model using space vector Motor Control Algorithm instead of traditional Motor Control method. A DSP experimental setup is also carried out to verify the control theory and simulation result. The experiment and simulation results show that the speed control system helps the asynchronous motor to achieve the consistent response characteristics with separately excited DC machine. When the motor doesn't work or the load is unstable, asynchronous motor can still achieve excellent electrical characteristics with the proposed speed control system, such as quick start, small overshoot and static torque ripple.
Exploration of O2O Mode in the Retail Industry
Authors: Pan Hai Lan , He Hai Hui , Wang Shuai
Published: September 2014

In recent years, the retail industry is facing great changes brought by the Internet, and O2O commerce model is an emerging pattern, especially in the last two years, it has gradually been accepted in traditional industries. In particular the retail industry practitioners who face the huge impact of E-commerce are full of hope and expectation for value and impact that O2O model can bring. For this reason, from the consumer point of view this article firstly considers situation and attitude of the business, and combines with the market situation, then tries to introduce a more comprehensive O2O model and analyses theoretical studies to provide some references for the O2O model practitioners.
Evaluation System Design of Emergency Management System Based on Fuzzy Comprehensive Evaluation
Authors: Hou Hong Feng , Wang Li Juan , Wang Hong Yan , Yin Bo
Published: September 2014

The evaluation index system of emergency management system is necessary in order to improve the level of emergency management. This article establishes a set of evaluation index system by the critical success factor method and applies fuzzy comprehensive evaluation model to evaluate the case of the emergency management information system. The result proves that the evaluation index system is reasonable and scientific.
Blended Training System Design Based on Moodle Platform
Authors: Yuan Jiu Gen , Li Zhi Guo , Zhang Wen Ting
Published: September 2014

Facing the challenge of educational information reform, teacher training is one of the effective ways to promote teachers’ ability. However, currently there are many problems existing in training ways, exchanges and communication, and time arrangement and so on. Blended training works well to integrate the features of C-training and E-training. This essay analyses the function and background of blended training from three fundamental theories: behaviorism, cognitivism and constructivism. Meanwhile, it also combines the characteristics of MOODLE platform following four respective steps: pre-class preparation, class lecture, online research and exchange reflection. We hope researchers can benefit from the model we constructed and can attain the most effective results through addressing contradictories when training by resorting to MOODLE blended training.
Evaluating the Relationship between Economic Growth and Environmental Pollution
Authors: Zhang Rui Lian , Yao Feng
Published: September 2014

The paper evaluates the relationship between economic growth and environmental pollution of Anhui province using the data from 1990 to 2012. The indicators for the evaluation included emission of industrial waste water (EIWW), emission of industrial waste gas (EIWG), emission of industrial solid waste (EISW) and GDP per capita (GDPPC). The results show that the relationship between economic growth and environmental pollution of Anhui province is different from Environmental Kuznets curve. There is a U-shaped plus inverted U-shaped curve between EIWW and GDPPC. EIWG and EISW keep increasing monotonically. The turning points of EIWG and EISW both apparently less than that of developed countries. Our study then predicts that EIWG and EISW begin to decrease when the GDPPC reaches 3421Yuan and 5189Yuan (The price of 1978) respectively. Our study reveals the importance of increasing environmental protection expense and strengthening the construction of environmental policy.
Application Research of Synthetic Decision Support for System Water Resources Dispatch and Allocation
Authors: Li Yan , Zhu Zi Jian , Li Sheng Yang
Published: September 2014

Water resources reasonable disposition is a measure to solve water shortage problem, cannot still meet the requirement of practice for the knowledge of complex water resources system and the method of describing and other theoretical research. The Yellow River has faced the dry-up of the Yellow River. A Synthetic Decision Support System (SDSS) for water resources dispatch and allocation, based on a new route and method to water resources dispatch and allocation derision-making was developed in order to gain a better understanding of the water resources dispatch and allocation. The paper completes the design of the main structure and functions of the system, and introduces the key techniques of implementing the system, through the analysis of application subject and information integration manner of the system, topological relationship between the water conservancy project entities in various river basins is established using the thought of graphic-topology and tree-topology. Adopting the data warehouse technique, the integration method of facing the decision subject, separation method of the user interface and application program, the method of water resources dispatch and allocation service model based on topological relationship, is established. The model is integrated with the scenario experiences and knowledge about the water resources dispatch and allocation accumulated by the experts and developers. The system has been put into application successfully, and satisfied effects are obtained, therefore it is worthy to be improved and popularized and has the great directive significance and applied value in optimum operation regulation and uniform management of water resources.
Path Planning Based on Fuzzy Logic Algorithm for Robots in Hierarchical Control
Authors: Jiang Kai , Li Chun Gui
Published: September 2014

To find the optimal path of mobile robots,a novel robot path planning strategy based on hierarchical control fuzzy algorithm has been proposed.The path planning strategy which developed to overcome the collision and avoidance problem in path planning of robot is inspired by fuzzy control concept,in order to achieving a target that making robots to follow a non-collision rapid and accurate path in uncertain environment.Simulation results showed that the strategy using fuzzy algorithm could meet the feasibility and validity demand.
Cement Raw Mill Based on PCS7 and PROFIBUS Production Line Automation Control System
Authors: Wu Fan
Published: September 2014

A large cement factory as an example, according to the requirements of process and control parameters of production line of raw mill, this paper researches and designs the automatic control system of cement raw mill production line based on PCS7 and PROFIBUS. The design of the whole system consists of three levels: field layer, control layer and operation layer which are connected by Ethernet and PROFIBUS implementation, and focus on the design of the feed flow includeing feed composition, feed machine speed loop control etc. Through the on-site operation, the system is stable and reliable, and has good application and promotion effect.
Application Study on Finger Joint Motion in Rehabilitation Training
Authors: Yu Jing Jing
Published: September 2014

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.
The Stress Monitoring Analysis of PC Continuous Beam Bridge
Authors: Yang Ya Xun , Fan Wei Ya
Published: September 2014

According to the structure and construction characteristics of PC continuous beam bridge and combined with the construction monitoring method of continuous beam bridge, this paper introduces the girder stress strain test technology and method of prestressed concrete continuous box girder bridge, also analyzes the various factors which affect the stress test. After monitoring LinGang big bridge, draw the conclusion through the analysis of its stress and strain.
Fault Monitoring System of Shearer Based on DSP
Authors: Ma Xian Min , Wang Gang
Published: September 2014

According to requirements of online monitoring for the working conditions of Shearer ,this article describes a monitoring network system of shearer based on DSP. The system uses a distributed sensor network and DSP technology which are better able to complete the data acquisition and data processing tasks and to get a more accurate real-time shearer signal parameters.
Research on Loading and Unloading Rheological Tests and Model Identification of Highway Tunnel Surrounding Rock
Authors: Zhao Cheng Long , Li Shu Cai , Zhang Le Wen , Ping Yang
Published: September 2014

On the background of Jiangxi Wuning–Ji'an highway tunnel, the rock triaxial rheological testing machine is adopted to conduct hierarchical incremental cyclic loading and unloading rheological tests on class II, class III, and class IV rock on the tunnel site. Take class II and class IV surrounding rock for example, this paper analyzes the creep deformation rules over time in depth, studies rock rheological properties, and provides the best rheological model of tested rock. According to research findings, deformation of class II and class IV surrounding rock is composed of instantaneous elastic deformation and creep deformation. The instantaneous elastic strain value increases with the increasing stress level and the rock deformation manifests as brittle failure. The generalized Kelvin model is the best rheological model that describes deformation of class II and class IV surrounding rock.
Three Dimension Units Theory and Hydraulic Converse Siphon Structure
Authors: He Yu Hong
Published: September 2014

In hydraulic structures, it is difficult to guarantee a converse siphon safety without good reaction force design between converse siphon structure and the foundation. Therefore, the special connection units, three dimension units, were adopted in this paper. The structural program design methods were used to compile three dimension units calculation software. It would give better solution to reaction force design between converse siphon structure and the foundation. It provided sufficient theoretical reference for a hydraulic converse siphon safety design.
Application of Web Services Technology in Telecommunication Point Redemption System
Authors: Sun Lei , Wang Wei , Xing Hong Mei
Published: September 2014

This thesis gives an introduction to the key technology and methods used in structuring telecom point redemption system from perspective of web services technology
Fractal Image Coding Based on Wavelet Transformation
Authors: Wang Xin , Pan He
Published: September 2014

The classic problem of the existence of fractal coding time is too long, a kind of fast encoding algorithm was proposed in this paper, which is based on Wavelet and Fractal combined, using wavelet decomposition characteristics. This method reduces the amount of image data compression effectively, shorts coding time and improve the image encoding quality.
The Research of Bus VANET Protocol on Signal Attenuation and Delay Probability of Multi-Hop Forwarding
Authors: Peng Ya Li , Yin Hong , Yu Peng
Published: September 2014

Aims to the routing protocol of Bus Vehicle Network with the characteristics of cyclical movement, we put forward to the Signal-Single & Multi hop Routing (SSMHR) routing protocol, which can solve the problem of the signal attenuation on urban environment and uncertain next hop forwarding on multi-hop. Link Survival Mode considering the signal attenuation will be established in Single-hop to select encounter nodes as forwarding candidate set. Discrete Stochastic Dynamic Programming Delay Probability Model will be established in Multi-hop using the historical data of bus cyclical movement. The two models ensure the submitted data reliable in single-hop, and probability of successfully submitted to the target vehicle through multi-hop within a limited delay. According to the simulation test, SSMHR protocol has a higher successful rate of data transmission and lower submitted delays.
Inspiration from Major International Airport at Home and Abroad Construction Experience to Beijing New Airport
Authors: Zhang Xu , Li Ji Hong , Wei Lan , Wang Jian Zhou
Published: September 2014

This paper summarizes the land-use experience of the major international airports at home and abroad. First of all, the paper studies the regular pattern of the major international airports at home and abroad land-use on total amount and land using area on every unit. Secondly, the paper summarizes the experience on runway amount of the airport, and studies passenger amount that a single independent runway can carry and how many times the plane can take off and land. On the basis of above experience, the paper brings forward some inspiration about land-use and runway layout.
Study on Changes of Vehicle Driving Behavior Characteristics for Alcohol Used Drivers
Authors: Zhong Ming En , Hong Han Chi , Cai Jian Jin
Published: September 2014

Drunk driving is proved to be dangerous for traffic transportation safety. However, there are still no specific conclusions about what changes do drinking make to each kind of driving behaviors. This paper set out a drunk states induce program and a simulated driving experiment to measure the data about driving speed, overspeed driving probability, brake frequency, probability of deceleration for avoidance and probability of running red lights when the drivers were in different degree of drunk states. Results showed that driving speed increases significantly only in state of heavy drunk while decreases slightly in state of moderate drunk. Overspeed probability grows higher as the drivers drink more. Brake frequency increases slightly in state of light drunk, but has no obvious change in state of moderate drunk, however decreases significantly in state of heavy drunk. Probability of deceleration for avoidance decreases a little in state of light drunk but significantly in state of heavy drunk, however increases in state of moderate dunk. Probability of running red lights increases significantly only in state of heavy drunk, but has no obvious change in both states of light drunk and moderate drunk. All these support a conclusion that drinking has different influences on each kind of driving behaviors, which perform differently for traffic transportation safety. Judgments for drunk driving related issues should be decided on each specific matter.
A Design of the Bone Conduction Ultrasonic Hearing Device
Authors: Wang Hui Jun , Li Guan
Published: September 2014

In view of the fact that the traditional gas conduction hearing AIDS does not function to the patients with ear canal jams, this paper introduces a kind of ultrasonic hearing devices. Through the ultrasonic voice signals sent by the bone conduction modulation, the hearing-impaired patients can get a certain degree of hearing. The device, with TM320VC5410 as signal processing unit, modulates the voice signals with ultrasonic and transmit the signals through the bone conduction headphone to human auditory nerves. The experimental results show that the hearing devices can help patients with severe deafness recognize sound and voice. As a result, it is of high application value.
Software Development of Corneal Endothelial Cell Analyzer
Authors: Yu Cheng Bo , Xiao Dan , Ke Yan Hong , Yang Yi Ju , Liu Lei , Yuan Yang Yu
Published: September 2014

Based on the current development of corneal endothelial cells in the domestic, this paper developed corneal endothelial cell analyzer software system which taken Microsoft Visual Studio as development platform in Windows7 system and combined with MATLAB image processing technology and the Access database information management technology. The software relies on a database established patient archiving and query system, by VC + + statically call the dynamic link library that MATLAB Compiler generated to complete image processing, by partial equilibrium approach for image enhancement, by dynamic difference method for determination threshold when binaries. The software provides good interactive interface and graphics display surface, but also sets aside network port as follow-platform extension.
Assessing Project Quality: A Multidimensional Approach
Authors: Miccoli Saverio , Finucci Fabrizio , Murro Rocco
Published: September 2014

As in the most developed contexts the ratio between qualitative and quantitative needs tends to increase progressively, also the sector of architectural design is urged to introduce suitable quality goals in its ideation processes. The assessment of the quality of an architectural design is justified by the advisability to check the results of its solutions with reference to the needs expressed by the point of view of the community, general, impartial and binding. The paper proposes an assessment model based on requirements and aimed at verifying the correspondence of the architectural design to a set of performance, based on multicriteria schemes.
Research of Construction Subcontracting Enterprise Competence Based on GA-BP Neural Network
Authors: Yan Xi Kang , Wang Jing Yu
Published: September 2014

A new evaluation index system, which includes five dimensions is put forward to evaluate the competitiveness of construction subcontracting enterprise properly. Based on GA optimized BP neural network model,construction subcontracting enterprises’ competitiveness can be quantitative analysis systematically. Use of Matlab simulation analysis,research has shown that this system can well solve the problem of construction subcontracting enterprise competitiveness evaluation.
Survey on the Curriculum Arrangement of TCM in Nursing of Chinese Medicine Higher Colleges
Authors: Yang Lu , Cui Miao , Liu Xing Shan
Published: September 2014

Purpose: Investigate and analysis of the curriculum condition of college traditional Chinese medicine in three colleges of traditional Chinese medicine about department of nursing where in the northeast of old city proper. The purpose of this study is to search for a course system of traditional Chinese medicine what clinical needs. Method: This study investigated not only take the undergraduate senior clinical interns of three colleges of traditional Chinese medicine and clinical teachers in Affiliated Hospital as study objects, but also adopting the method of comparative methods and descriptive statistical methods. Compare with the results of three colleges and the results of other twenty colleges in the whole country. Results: Tough the questionnaire, obtained three colleges of traditional Chinese medicine of the curriculum condition of college traditional Chinese medicine in northeast area, here are problems of a small number of gates medicine courses and fewer hours of theoretical lessons. Conclusions: the curriculum condition of college traditional Chinese medicine in three colleges of traditional Chinese medicine about department of nursing should also embody Chinese characteristics, to the clinical needs of the direction of adjustment.
Treatment of Heavy Oil Wastewater by HCR with Hydrolytic Acidification Process
Authors: Wang Hong , Wang Xin , Lv Xue Dong , Wang Shi Man
Published: September 2014

To reduce the pollutants of a heavy oil wastewater, a process of high performance compact reactor (HCR) coupled with hydrolytic acidification was investigated, focusing on the removal effect of the typical pollutants and the hydrolytic retention time (HRT) of HCR system.. The results showed the removal rates of COD and oil were 20.4%~40.7% and 25.5%~39.8% after the treatment of hydrolytic acidification, while the whole system reached the 80% removal rate. When the HRT was 48h and jet flow was 3.1m3/h in HCR process, COD and oil were blow 200 mg/L and 10 mg/L, which met the requests of next treatment of wastewater.
SPXY Sample Classification Method and Successive Projections Algorithm Combined with Near-Infrared Spectroscopy for the Determination of Total Sugar Content of Southern Xinjiang Jujube
Authors: Peng Yun Fa , Luo Hua Ping , Luo Xue Ning , Zhan Ying
Published: September 2014

Sugar degree is an important indicator of red jujube internal quality. The main objectives of this paper are to minimize the collinearity between spectral variables, to find the variable groups which containing the lowest redundant information,and establish the model with better robustness by means of fewer variables. This paper uses SPXY (sample set partitioning based on joint x-y distances) to divide calibrating samples,and applies successive projections algorithm (SPA) to select the near-infrared spectral characteristic variable of southern Xinjiang jujube total sugar. To further establish the partial least squares (PLS) model with selected variables. The root mean square error of prediction (RMSEP) of the model is 2.8804. The correlation coefficient of prediction r is 0.9005.To compare the established PLS model results between SPA selecting variables and full spectrum. The results showed that: Firstly, the divided calibrating samples is reasonable in SPXY way.Secondly, SPA optimizes 9 variables of the full spectrum 1557 variables,and prediction effect of the established PLS model is better than the full spectrum PLS model.Finally,SPA can effectively select characteristic wavelength of component under test.
Research Review of Impact of Double Skin Facade's Structural Factors on Cavity Heat Transfer
Authors: Wang Zhi Yong , Zhang Tian Yu , Liu Chang Rong , Yang Shun Fu , Cui Na
Published: September 2014

The heat transfer property of double skin façade’s façade was analyzed and summarized from the façade’s ventilation pattern, shading mode, cavity width, cavity height, vent openings, the glass optical property and its sequence and convection methods. It showed that the analysis of double skin facade should employ various research methods on the basis of dynamic analysis and comprehensively take multiple factors into consideration on the grounds of actual situation for which may have effects on the heat transfer property of curtains. As a result, more double skin façade with a higher performance of heat transfer can be invented.
Morphological Evolution of Al-2wt%Si-2.5wt%Cu Alloy Produced by EMS and EMS Enhanced by ECAP
Authors: Torres Luis Vanderlei , Benati Davi Munhoz , Zoqui Eugênio José
Published: September 2014

This work evaluates the morphological evolution at the semisolid state of the Al-2wt%Si-2.5wt%Cu alloy produced by direct chill casting under electromagnetic stirring (EMS) and this same raw material enhanced by one equal channel angular pressing pass (ECAP), specially designed to produce raw material for thixoforming processes. The traditional EMS production method is compared to ECAP in order to determine if a second procedure is necessary for this particular alloy. The ECAP process emerged as a promising technique capable of imposing severe homogeneous deformation in metals, which could improve thixoforming processes. The ECAP deformation occurs in a matrix that contains two channels of the same cross-sectional area and form an angle of Φ = 90° and Φ = 120°, the process can be repeated many times allowing to control the microstructure and properties of the materials. Both raw materials, EMS and EMS + ECAP were submitted to re-heating treatment in two conditions of solid fractions, 45% and 60% at soaking times of 0s, 30s and 90s. With this procedure primary particle sizes of about 60 μm were obtained, which exhibit favourable characteristics for the thixoforming process.
In Situ Microstructure Observation of Steel Grades in the Semi-Solid State for Thixoforging Process by Using Confoncal Laser Scanning Microscopy
Authors: Gu Guo Chao , Pesci Raphaël , Becker Eric , Langlois Laurent , Bigot Régis
Published: September 2014

It is necessary to well understand the microstructure evolution during high speed heating and forming for steel thixoforging, since it determines the thixotropic flow behavior of materials in the semi-solid state. A new in situ technique - high temperature Confocal Laser Scanning Microscopy (CLSM) - was developed and used for studying the microstructure evolution directly at high temperature where the microstructure in the semi-solid state could not be preserved by quenching experiments for conventional 2D characterization. Several steel grades (C38LTT, 100Cr6 and M2) were investigated during heating from the as-received state to the semi-solid state and finally cooled to the solid state).It has been found that there is a significant difference in diffusion rate of alloying elements between these grades during heating and cooling. In M2, thanks to the high content of alloying elements and their low diffusion rate, the semi-solid temperature range is greater and its microstructure in the semi-solid state could be preserved by quenching or even at a low cooling rate, which means the microstructure of M2 in the semi-solid state can be characterized in room temperature on quenched M2 samples. On the contrary, the microstructure of other steel grades 100Cr6 and C38LTT in semi-solid state can only be revealed by CLSM at high temperature because of the lower volume fraction of alloying elements and their high diffusion rate. It is very interesting to use high temperature CLSM to in situ investigate the microstructure evolution in the semi-solid state, especially at low liquid fraction.
Solidification of a Binary Solution (NH4Cl+H2O) under Shear Flow: A Numerical Study
Authors: Nayak Akshaya Kumar , Barman Nilkanta , Chattaopadhyay Himadri
Published: September 2014

In the present work, the solidification behaviour of a metal analogues transparent binary solution (8 wt% of NH4Cl in H2O) under shear flow is investigated numerically. The shear flow in the mush is developed due to flow over an inclined cooling plate. The dendrites formed during solidification are fragmented under the shear flow and transported into the bulk solution. The suspended dendrites form a slurry layer in the domain. Consequently, a suitable mathematical model is considered to study the transport phenomena. In the mathematical model, the free surface of the solution is represented by the volume-of-fluid (VOF) method. The solidification process is modelled by a set of volume-averaged-single-phase mass, momentum, energy and species conservation equations. A separate equation is considered for the solid velocity based on Stokes model. The governing equations are solved based on the pressure-based semi-implicit finite volume method according to the SIMPLER algorithm using TDMA solver along with the enthalpy update scheme. Finally, the simulation predicts temperature, velocity, solid fraction and the species distributions in the computational domain. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}
Simulation on Flexible Thixo-Extrusion of Variable Cross-Section Part Based on DEFORM-3D Software
Authors: Wang Chun Fang , Wang Kai Kun , Luo Zhe
Published: September 2014

Flexible thixo-extrusion, as an innovative near-net-shape forming method, has huge advantages in processing the components with complex geometry. However, it should keep in mind that conventional liquid casting still represents the dominant mean of aluminum alloys production. One of the obstacles the thixo-extrusion has to overcome is lack of proof that can live up to the claim that thixo-extruded components have better mechanical properties. The main aim of this paper is to simulate the flexible thixo-extrusion process of aluminum alloy A356 and investigate the control method of materials flow front. An isothermal compression test of aluminum alloy A356 is first conducted to obtain the true stress-strain curves at different temperatures and strain rates. A constitutive equation describing the relationship of stress, strain, strain rate and temperature is fitted by Origin and then imported to the DEFORM-3D simulation software. The results show that the quality of final component is enormously influenced by the radius of the arcs and the flexible thixo-extruded components has less defects compared with the conventional extruded ones.
A Comparison of Grain Refinement Efficiency by Shearing above and below the Liquidus
Authors: Haghayeghi Reza , Kapranos Plato
Published: September 2014

There has been a great debate whether grain refinement is more effective when shearing above or below the liquidus. In this work, examination of the microstructural evolution in AA7075 alloy has been performed, after stirring above & below the liquidus. The results suggest that shearing above the liquidus is more effective. The outcomes indicate that at temperatures below the liquidus, the convective forces produced by electromagnetic forces cannot break the dendrites due to low velocities, whilst at shearing above the liquidus through a cavitation-enhanced nucleation mechanism grain refinement is promoted. It appears that by applying magnetic forces above the liquidus temperature, shearing effects result in finer grain sizes and consequent enhancement of properties.Keywords: Electromagnetic Casting, Grain Refinement, Cavitation Mechanism
Investigation of Parameters Promoting Hot Cracking during Semi-Solid Forming Processes
Authors: Favier Véronique , Becker Eric , Bigot Régis
Published: September 2014

Semi-solid forming processes can lead to hot cracking. The process parameters responsible for hot cracking are still not well known. The paper aims at contributing to a better understanding of the process parameters promoting this phenomenon. Finite element simulations of thixoextrusion tests were carried out to analyse the thermal and mechanical fields. Comparisons between experimental and calculated results enable to propose a hot cracking criterion.
THINCASTTM; Providing Strong, Lightweight Castings for Automobiles and Other Applications
Authors: Franke Alois , Jorstad John L.
Published: September 2014

Aluminium Rheinfelden has improved the competitiveness of semi solid processing by developing a casting process & alloy combination that is capable of ultra thin, ultra light parts having attractive engineering properties without need for full heat treatment. The THINCASTTM rheocasting process, together with Rheinfeldens Magsimal-59 alloy has been demonstrated capable of producing moderate sized castings with only 1-2 mm wall sections, thus providing a 30-50% reduction in traditional-process part weight. THINCASTTM can be adapted to a variety of die casting machines and will enable competitively improving the quality of conventional high pressure die castings as well as creating entirely new applications.
A Study on Bubbles in Semisolid Alloys
Authors: Guo Li Jun , Xing Shu Ming , Bao Pei Wei
Published: September 2014

Abstract. Bubble or blowhole is one of the most common defects in the workpiece produced by a semisolid alloy process. Except some bubbles are discharged out of the melt, many of the bubbles remained in the semisolid slurry will be deformed, enlarged or merged in the storage and transport process of the semisolid slurry, and be compressed, burst, flattened into crack which is called as gas induced crack in the further semisolid process. How to control and reduce the bubble defects is a key problem to give full play to the advantages of semisolid processing technology in industrial applications. In this paper, the behaviors of growing, floating, escaping and changing of the bubbles in semisolid alloys were theoretically explored during the smelting, filling and forming, and the mathematical models for predicting bubble dimensions and remained bubble ratio in the semisolid slurry were derived based on the theory of twophase flow and the principle of rheology. Moreover, the mechanism and critical conditions for forming the bubbles defects and gasinduced cracks defects in a workpiece were discussed by mechanics analysis. Finally, the relationships between blowhole defects, cracks defects and process parameters were built through kinetic analysis for the rheology behaviors of the semisolid slurry and bubble growing process. These mathematical models will provide a reference for controlling and preventing defects of the blowhole and cracks in the semisolid process.
Development of New Type Semi-Solid Injection Process for Magnesium Alloy
Authors: Murakami Yuichiro , Miwa Kenji , Omura Naoki , Tada Shuji
Published: September 2014

We have developed new type semi-solid injection process for magnesium alloy. This process does not require to use any cover gases and the special magnesium billet such as thixo-billet. In this study, plate specimens were produced by injecting the semi-solid billet with different fraction solid. The microstructure observation, detection of casting defects by an X-ray computed tomography scanner, and tensile test were carried out. With increasing fraction solid, the size and shape of α-Mg solid particles became smaller and more spherical. In the condition of low fraction solid or forming in liquid state, the casting defects were located in the center of the specimen at the thickness direction. Additionally, the volume fraction of the casting defect decreased with increasing fraction solid. Moreover, the casting defects can be reduced by preventing solidifying and clogging of the top of the nozzle. Then, the specimen which has few casting defects could be obtained by injecting the slurry of fraction solid 0.5. However, the tensile strength and yield strength were highest in fraction solid 0.4. It is contemplated that the composition of the solid solution component element in the matrix was increased in fraction solid of 50%, therefore the matrix became brittle.