bluuebunny/crossref_metadata_2025 huggingface dataset:
Library Issues in Adult Online Education
Authors: Golian-Lui Linda Marie , Westenkirchner Suzy
Published: September 2010

Adult online learners have unique information and technology needs which are best met by libraries and library professionals. Combining the concept of andragogy along with best practices for the library profession significantly assists librarians in providing meaningful learning opportunities. Effective library support for adults in online learning experiences incorporates the concepts of learning style theories, thinking style theories, and library anxiety research. Best practices in information literacy and technology literacy assist librarians in supporting the broad needs of adult online learners.
Blended Learning Primer
Authors: Torrisi-Steele Geraldine
Published: September 2010

Whilst the potential of blended learning to provide cost effective and quality learning experiences in adult education is generally acknowledged, deciding ‘what to blend?’ and ‘how to blend?’ is challenging. The design and implementation of blended learning is specific to the learning situation. Given the range of possible learning situations and the wide array of possible tools there are virtually endless possibilities for the blended learning designs. Those first embarking on blended learning ventures are faced with the task of surveying the vast quantity of resulting literature to gain a fundamental understanding of the concept and its implementation. For those beginning to implement blended learning in adult education contexts, this chapter attempts to provide a starting point for further exploration. This chapter seeks to lay foundations for understanding the concept of blended learning by firstly defining the term, and then highlighting key design concepts by discussing appropriate philosophical foundations and instructional design principles. An overview of some of the existing models and frameworks for blended learning in adult education is then given. Finally, some of the advantages and challenges of blended learning are discussed and future directions and research issues are identified.
Community Service Learning
Authors: Poirier Sandra , Wooldridge Deborah , Mayers Gloysis , Sonleitner Nancy , Coughlin Chris
Published: September 2010

A learning community where students develop the knowledge, skills and abilities needed for meaningful and successful 21st century work and life is the vision for higher education programs in the Middle East. A successful learning community of faculty members, students, and site supervisors in a variety of community programs are working together to achieve this objective, and are jointly engaged in the pursuit of excellence and the development of human potential. It is Zayed University’s goal to assure that students develop the higher-order intellectual capacities and technological skills they will need to succeed in a rapidly changing and increasingly complex world. This paper describes the model used to meet the challenges faced by first generation female college graduates in the United Arab Emirates, a model that emphasizes community service learning placements and undergraduate research projects. These first generation graduates are also those who are expected to transition into a very conservative work environment. For the majority, community placements provided through this model is the first opportunity through which they are able to have any level of workplace experience. In this paper we will report on this innovative community service program model experienced by students and will address challenges and successes of this program model which utilizes undergraduate student research, community involvement and the integration of female graduates into the workforce. We will share how this model provided insights into the work experience, as reported in students’ journal reflections. An effective service learning program and undergraduate research involvement allowed these graduates to put theory into practice, develop habits of self analysis and reflective thinking, and contribute towards a greater understanding of organizational structures.
Blended Learning
Authors: Swanson Karen Weller , Kayler Mary
Published: September 2010

As institutions look for ways to increase enrollment and students seek greater flexibility in their learning environments, blended learning is emerging as the best of both worlds. This chapter will discuss why both students and instructors choose blended learning (BL) and the benefits of BL pedagogically. The layers of software required to support BL will be briefly described for the purpose of supporting a discussion of the tools used to design online learning. The role of assessment and the need to create communities of practice within a BL environment will be illustrated. With a changing emphasis from software and function to one of learning outcomes, this chapter will present Learning Activities Management Systems (LAMS) and the International Society for Technology in Education (ISTE) standards which focus on the advancement of instructional design. ISTE will be introduced as a framework for students and instructors to gauge their teaching and learning goals.
Evaluating Teaching in Adult Education
Authors: Martin James B. , Collins Royce Ann
Published: September 2010

Teaching is the bedrock of the learning environment; however, few instructors receive formal instruction on how to teach. While the quality of teaching adults can be assessed in numerous ways, these authors used their experience of creating faculty development programs at small, liberal arts universities to discuss instructor selection, student ratings, mentorship, and peer review. Looking through the lens of formative assessment (evaluation for improvement rather than judgment) and faculty development, this chapter looks at creating a faculty evaluation system which will grow instructors. While many of the items discussed in this chapter could be used with full-time faculty, the focus for these authors is the adjunct community who teach in many adult education programs.
Age, Race and Gender Issues Related to On-line Learning
Authors: Stuck M. F. , Ware Mary. C.
Published: September 2010

Research has shown that demographic factors such as age, race, ethnicity and gender affect one’s communication skills, learning style preference, and consequently, one’s preferences for aspects of on-line learning. This chapter will explore the literature related to these issues (i.e., age, race, gender) as they affect students’ preferences for and success with various styles of on-line learning (e.g., distance learning, hybrid or blended courses, mobile learning technology).
Virtually Onboarding and Supporting Adult Students in College Using Web 2.0 Technologies
Authors: Golubski Pamela M.
Published: September 2010

The transition to college is a difficult time for most students. Students experience changes in interpersonal and social adjustment, academic and career concerns, as well as personal change (Bishop, Gallagher, & Cohen, 2000). For adult learners this transition can be further complicated by working full-time and family responsibilities. Thus, failure of any student to not successfully adjust and acclimate into his or her new college community can greatly affect the student’s persistence and academic success (Tinto, 1993). While most colleges offer a short term in-person orientation to help new traditional-aged students integrate into a college campus, adult students are often left without an option. Though, an alternative method of orienting, acclimating, and supporting adult learners might be realized through the use of virtual and Web 2.0 technologies. Through this method, college staff and faculty members can onboard adult students to campus by virtually interacting, advising, communicating, and supporting them. Additionally, a virtual onboarding program can encourage adults to socialize with their peers and be acclimated to campus support services and offices, in an effort to increase a student’s social integration and interaction, academic preparation and success, and college adjustment.
Design of Precision Micro-Milling Machine for Meso-Scaled Parts
Authors: Cao Zi Yang , Li Hua
Published: September 2010

To create miniaturized components, a 3-axis micro-milling machine tool composed of linear motor stages, high-speed air-bearing spindle and motion control card DMC-1842 is developed in this paper. The CNC system of the parallel double CPU based on industrial control computer and Windows operating system is constructed. The application software of CNC system is exploited by modularized mind in C# programming language, reasonable human-computer interface is designed. Finally, in order to validate the performance of the micro-milling machine, the miniaturized parts are machined o by developed CNC system. Through these tests analysis, the hardware and software architecture of the CNC system is verified to meet the requirements of the micro-milling machine tool. Micro-milling process with developed micro-milling machine tool is proved to be feasible and applicable, and can fully satisfy the producing requires of miniaturized components.
Materialized View Selection in the Data Warehouse
Authors: Zhou Li Juan , Geng Hai Jun , Xu Ming Sheng
Published: September 2010

A data warehouse stores materialized views of data from one or more sources, with the purpose of efficiently implementing decision-support or OLAP queries. Materialized view selection is one of the crucial decisions in designing a data warehouse for optimal efficiency. The goal is to select an appropriate set of views that minimizes sum of the query response time and the cost of maintaining the selected views, given a limited amount of resource, e.g., materialization time, storage space, etc. In this article, we present an improved PGA algorithm to accomplish the view selection problem; the experiments show that our proposed algorithm shows it’s superior.
The Prediction of Grain Output in Jiangsu Province Based on the Grey Markov Methord
Authors: Zhou Qing Yuan , Luo Jian Jian
Published: September 2010

Since Grain yield prediction is significant for regulating grain prices, the research on the accurate prediction of grain output has great value. According to the grain output of JiangSu province over the years, the grain output can be predicted by adopting the grey Markov method, and the outcome has shown that there is a great error between the grain prediction by only using the grey prediction model and the practical output. The error rate between the grain prediction of 2009 and the actual output is -4.25%, which can be improved into 1.67% after being amended by Markov, and accuracy is increased by 63.05%. The precision of prediction results, after being revised by Markov, can meet the practical requirements.
Research on Triangulation Reconstruction from Section Data
Authors: Zhu Ge Jun , Ma Chang Sheng , Xie Feng
Published: September 2010

Section data is a common reconstruction data source in reverse engineering. By adopting methods of adding subdivision segments between the adjacent contour segments, the generation of triangular surface can be achieved. Besides, based on the traditional algorithms, the "slow subdivision" and "dislocation amendment" and other strategies can be combined, and the accuracy of the output data has been increased dramatically by using the improved algorithm.
Research on Cow Epidemic Disease Diagnosis Based Certainty Factor
Authors: Jing Xu , He Dong Jian , Zan Lin Sen , Wang Jing Yu , Zhao Jing
Published: September 2010

According to actual of cow epidemic disease diagnosis, bidirectional reasoning scheme based on the symptom both characterization and autopsy is proposed, which is based on inexact reasoning of certainty factor. The process of both construction the knowledge database for cow epidemic disease diagnosis and the inexact reasoning based on certainty factor are amplified. A web-based system on the platform of Tomcat+JSP+MySQL+DWR about the cow epidemic disease diagnosis is realized base on MVC. By testing, it is shown that the monitoring 21 kinds of cow epidemic disease in China can be accurately diagnosed, basically. It can be widely used in breeding aquatics village, breeding farm, raising households and so on. It will play a positive role to prevent and control the cow epidemic disease.
Research on Customer Requirements Expansion Based on TRIZ and Grey Theory
Authors: Ge Jiang Hua , Xu Jian Yuan , Wang Ya Ping , Wei Fen
Published: September 2010

To accurately understand the current customer requirements, mine and predict those of potential market, requirement expansion method based on TRIZ was proposed to realize horizontal expansion of customer requirements and grey theory was applied to vertical expansion to maximize the diversity of customer requirement. Meanwhile, ontology model of customer requirements was built to represent in detail complete information of customer requirement, it provided the basis for determining product family reasonably and comprehensively.
On Adaptive Identification Algorithm for PA Linearization
Authors: Li Huan , Pan Cheng Sheng , Zhang Yu , Ren Bo
Published: September 2010

According to the nonlinear amplification characteristic with memory effection of power amplifier(PA) in WCDMA systems, we have analyzed the structure of Wiener digital predistortion system in which Hammerstein power amplifier model with memory is adopted. LR algorithm and LMS algorithm were used respectively to identify and update parameters of Wiener predistortion system. An LR / LMS identification algorithm is proposed for syetem adaptive Identification. The method has a very good suppression of signal spectral regrowth. Theoretical analysis and computer simulation verified the effectiveness and practicability of the algorithm.
Research on Assessment Methods of Load-Bearing Capacity of Existing Bridges
Authors: Liu Guo Jun , Yang Yong Qing , Guo Fan
Published: September 2010

This paper makes an in-depth research on Assessment Methods of Load-bearing Capacity of Highway Bridge (Ministry of Communications of The People’s Republic of China, 1988) and makes a conclusion on assessment methods. Combined with current bridge inspection technology, it points out the limitations and shortcomings of the methods, and proposes the direction of assessment of existing bridge load-bearing capacity.
Dual Mechanical Environment Simulations on Liquid Reserve Batteries
Authors: Wu Bin , Huang De Dong , Xi Sheng
Published: September 2010

Dual mechanical environment simulators are usually used to supply recoil force and centrifugal force for simulation of liquid reserve batteries during artillery projection. When the vehicle with fuze batteries impacts the wooden block rotating with high speed, whether the transient impact parameters and the time required for the vehicle reaching the rated revolution are in accordance with the test conditions of fuze batteries is one of the key technologies. Finite element simulations are implemented for the transient vehicle impact process, the variation of vehicle acceleration under different projection velocities, the variations of vehicle acceleration and impulse duration with different wooden block thicknesses, and the time required to achieve stable rotational speed are discussed in this paper, which can be a reference for the simulator design.
Research on Oil Mist Condensation in Lubrication Pipe Based on CFD
Authors: Song Jin Chun , Chen Jian Wen , Zhang Zhi Wei , Wang Chang Zhou
Published: September 2010

Oil mist lubrication is currently widely used as a lubrication method now. It has some advantages as follows: low fuel consumption, uniform lubrication and high efficiency. In job site, oil mist condensation occurs in the pipeline, and this will not only reduce the efficiency, but also lead to accidents. Nowadays, CFD numerical simulation software has been widely applied in design, but the research of oil mist condensation in the transmission process based on CFD is very fare. In this paper, to choose the right the working parameters and a reasonable pipeline layout in job site, the oil mist condensation in the pipeline was simulated based on CFD. And it was found that, the diameter of oil mist particle is mainly influenced by temperature, and the best temperature range is made out.
Study on Similar Skills of Dynamic Model Test Concerning Fluid-Structure Interaction for Water-Conveyance Tunnel in Soft Soil
Authors: Liu Jin Yun , Chen Jian Yun
Published: September 2010

Three basic types of similar relationship between the prototype and the model for dynamic structural model test and dynamic destructive model test were proposed in corresponding literatures. At the time the situation where various similar relationships are applicable and the technique to ensure similarity for the different goal was discussed. Here the numerical simulation of model test of water-conveyance tunnel concerning fluid-structure interaction in soft soil is studied. Based on economy and practicability of selective material for model test, the similar relationship and the technique are proposed, which are validated through the example. The results of numerical simulation show: under the specific conditions, data of the model test can completely transfer to those of the prototype by use of this type of similar skill, and get more useful information. Some new ideas are introduced to keep the similarity of the hydro-structure structures.
Effect of Velocity of Fluid Field of 3-Spacer Nozzle in Roll-Casting Models Using Coupled Fluid-Thermal Finite Element Analysis
Authors: Zhou Ying
Published: September 2010

A finite element model of fluid field of front-box and 3-spacer nozzle of aluminum roll-casting has been developed to provide a comparison of analyzing distribution of velocity and temperature of outlet of nozzle with variable velocity. The computation is performed by using coupled fluid-thermal FEM simulation of FLOTRAN module in ANSYS 6.0. The boundary conditions of the roll-casting model of fluid and thermal fields, were loaded on front-box and nozzle. Based on the postprocessing function of ANSYS, the strict result analysis was conducted by MATLAB. Results based on the allowable inhomogeneity of velocity and temperature of outlet show the most possible broken regions of outlet could be predicted in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet. The profile parameters of the nozzle including distribution, shapes and sizes of the nozzle spacers, and shapes of inner nozzle must be optimized to be appropriate in high roll cast speed.
Failure Detection Using Matrix Pencil Algorithm to Reaction Wheel
Authors: Liu Guo Hua , Li Dong , Zhang Rui , Zhang Jing , Li Zhi Zhou
Published: September 2010

Reaction wheel is the main actuator of micro satellite control system. The failure of reaction wheel would have a strong impact on satellite if it can not be detected. For failure detection of reaction wheel, the model of reaction wheel is established, and then the Matrix Pencil algorithm of the current of wheel is processed, and further average current feature measurement is used to distinguish the characteristic of the wheel failure. The measurement represents the transformation at the stage of failure. To compare with other method, we introduce the wavelet filtering. The simulation results show that the signal processing method based on Matrix Pencil method has significant filtering effect on break signal than normal method.
Large Wind Turbine Blade Layer Design and Dynamics Characteristics Analysis
Authors: Wang Xin , Xu Yu Xiu , Ma Chuang
Published: September 2010

A 2.5MW wind turbine blade is modeled. The maximum static stress obtaining by the finite element method is compared with the theoretical analysis’s. The results acquired by both of them are same with each other, which validate the rationality of the finite element computational modeling. We find out the weakness regions of the blade by modal analysis on blade. This parper studies the effects of the axial of the fibrous layer, the proportion of axial fiber and the number of layers on the blade dynamic characteristic, respectively, and designs an optimization scheme to improve the blade dynamic characteristic. The research shows that adopting multiaxial, the rational fiber layers' proportion and increasing the layer number can be used to enhance the blade strength; the optimization scheme of the blade layer design in this way can improve the blade dynamic characteristic effectively and apparently.
Calculating Study on Flow Characteristics of Butterfly Vacuum Control Valves
Authors: Zhang Shi Wei , Song Guang Zhe , Wang Zhuo , Liu Jin Ce , Zhang Zhi Jun
Published: September 2010

Aiming at the actual demand, the gas flow characteristics of butterfly vacuum control valves are investigated in this paper. Classification and characteristic of vacuum control valves are discussed in detail. The geometric and mathematic models for two kinds of butterfly vacuum control valves, with seal and without seal, are respectively built. The gas flows through the valve at different opening angles are simulated under different pressure by means of the Fluent software. The flow percentage function and adjustment sensitivity are introduced and formulated to describe the flow regulating characteristic of control valves. The flow conductance coefficient and flow loss coefficient are defined and formulated to describe the resistance characteristic of control valves. The dates and curves of some simulating examples are given and discussed.
Research on Mass Partition Coefficient for a Whole Car under Vertical and Lateral Road Excitations
Authors: Wu Long
Published: September 2010

Consider the imperfectness of mass partition coefficient for a whole car in automotive theories, a vehicle physical model with fourteen degree of freedoms under vertical and lateral road excitations is adopted as research background in this paper. With the help of force analysis of sprung mass in three dimensional space and investigations on vertical, lateral, pitch, roll and yaw motions, the ration relations of dynamical coupling between a whole suspension and four quarter suspensions are deduced and achieved. The analytical results obtained in this paper develop the theoretical content of mass partition coefficient. It will be utilized to analyze, test and control among different car suspensions in the fields of vibration, handling and steering systems in future.
Design of Voltage Monitoring Module of Stacked Lithium-Ion Cells in Series
Authors: Sun Bei , Wei Xue Zhe
Published: September 2010

Based on the comparison with the other one of the current mostly used battery monitoring plan and analysis, this paper decides to adopt the architecture of the single battery monitoring module with CAN gateway, paper describes the design of the single battery detection module in every detail, including the description of module architecture, the hardware design and the software design, and this module has been done the off-line test verification, results can meet the requirements of stabilization and reliability.
A New P-Type Clocked Adiabatic Logic for Nanometer CMOS Processes with Gate Oxide Materials
Authors: Hu Jian Ping , Ye Li Fang , Su Li
Published: September 2010

Leakage current is becoming a significant contributor to power dissipations in nanometer CMOS circuits due to the scaling of oxide thickness. This paper proposes a new P-type clocked adiabatic logic (P-CAL) to reduce gate leakage based on the fact that PMOS transistors have an order of magnitude smaller gate leakage than NMOS ones in nanometer CMOS processes using gate oxide materials. Based on the power dissipation models of adiabatic circuits, the estimation technology for the active leakage dissipations of P-CAL circuits is proposed. The active leakage dissipations are estimated by testing total leakage dissipations with additional load capacitances using SPICE simulations. Compared to N-type clocked adiabatic logic (N-CAL) circuits, the total power and leakage power dissipation of P-type CAL circuits are reduced greatly.
Generalized Thermoelastic Responses of Functionally Graded Materials
Authors: Li Shi Rong , Zhou Feng Xi , Lai Yuan Ming , Yang Yan
Published: September 2010

Based on the generalized coupled thermoelasticity in the Lord-Shulman (L-S) model, the state equation of infinite functionally graded plates were established by using of the Laplace transform and state space approach, in which the displacement, temperature and their first derivatives were chosen as state variables. As a numerical example, a functionally graded plate with the material properties changing by exponential law distribution along the thickness of plate, subjected to thermo-mechanical shock was considered. By employing the numerical inversion of the Laplace transform, numerical result showing the temperature, the displacement and stress components changing with the time are represented graphically. Characteristics of the propagation of the thermal elastic wave are also analyzed.
A Study on the Position and Velocity Control of AC Servo System Using Discrete Sliding Mode Predictive Algorithm
Authors: Li Hong Ke , Song Li Zhong , Li Huai Shu , Huang Lin Shu , Yin Yang
Published: September 2010

The sliding mode predictive controller based on an improved sliding mode reference trajectory is proposed for AC servo systems. On the basis of analysis of servo control systems, the position and velocity control strategy using the sliding mode predictive algorithm is developed. Combining the merits of the sliding mode and predictive control, the algorithm can improve the robustness and eliminate the chattering phenomenon. Moreover, according to the velocity profile during positioning, the sliding mode reference trajectory is designed in accordance with corresponding state motion curves to guarantee the desired dynamic characteristics. Finally, the application experiment is implemented and results demonstrate the feasibility and effectiveness of the proposed control scheme.
Numerical Simulation of the Supersonic Inlet Flow Field
Authors: Cao Da Min , Lv Hong Yang , Zhang Xing Yuan , Hu Sheng Bin
Published: September 2010

The 2-D internal steady flow of the scramjet inlet-isolator was numerically simulated by the CFD method. The static pressure contours of the scramjet inlet-isolator under different boundary thickness and different back pressure were given. The numerical simulation results of two kinds of reasons which make the inlet un-start are obtained. One is the boundary layer thickness and another is the high back pressure at the exit of the isolator. When the boundary layer thickness increased, air can not smoothly flow into the inlet isolator and caused inlet un-start. Sameness along with the back pressure rise, have the phenomenon of inlet un-start, too. But the reason of un-start is disaffiliate. In the text analyzed the reasons of un-start phenomenon which from two different perspectives on the problem.
Measures of Protection against Electric Shock on EV
Authors: Chang Xue Yu , Sun Ze Chang , Wei Xue Zhe
Published: September 2010

Vehicle safety is a very important design element for all types of vehicles designed for use on public streets or roadways. Traditional vehicles produced with liquid fuels have a long history of creating appropriate safety countermeasures. With the onset of new electric propulsion and charging systems, proposed for large scale production, new safety design elements will need to be provided to vehicle developers. This paper attempts to summary the usually protective measures against electric shock on electric vehicles and to analyze these measures to formalize a series of important safety references for vehicle developers.
Experimental Study on Cutting Force of Pocket Corner in HSM
Authors: Zhao Zhen Yu , Liu Ming Jun , Liu Bai
Published: September 2010

Pocket corner in the high-speed milling (HSM) often occur under-cut, over-cut, vibration and other phenomena. This not only reduces tool life, seriously affected the work-piece machining accuracy and processing efficiency. In the paper, the impact of cutting speed on cutting forces is studied in the pocket corner based on the high-speed milling experiments. The results show that cutting force increased slightly with the increase in cutting speed, and that cutting force no significant change with the increase in radial depth of cut.
Time-Varying Sliding Mode Control for Discrete-Time Nonlinear Uncertain Coupled Systems via Sliding Mode Prediction
Authors: Xiao Ling Fei , Duan Shao Dong , Shen Tao
Published: September 2010

In this paper, a novel time-varying sliding mode control (SMC) algorithm based on sliding mode prediction for a class of discrete-time nonlinear uncertain coupled systems is presented. After giving a kind of time-varying sliding mode function, a sliding mode prediction model is used to predict the future information of sliding mode. By employing feedback correction and receding horizon optimization approaches which are extensively applied in predictive control strategy, the desired discrete-time variable structure control law is obtained. Under the influence of uncertainties whose boundaries are unknown, the closed-loop systems are proofed to be robustly stable. Numerical simulation results illustrate that compared with conventional SMC method, under the algorithm proposed in this paper, chattering is eliminated, the control signals have smaller peak values, and the closed-loop system possesses stronger robustness.
Study on Master-Slave Control Method Using Load Force and Impedance Identifiers for Tele-Operated Hydraulic Construction Robot
Authors: Li Xiao
Published: September 2010

A master-slave control method based on the identifications of load force and impedance for Tele-operated hydraulic construction robot system is presented in this paper. The robot system is composed of a hydraulic excavator and two joysticks. The hydraulic excavator is served as the construction robot. The joysticks are used for operating the robot in a remote region. The master actuator and the slave actuator in this system are the joystick-gear of a joystick and the fork-glove actuator of the excavator respectively. The load force and impedance identifiers are used for identifying the load force and impedance of the slave actuator respectively. According to the load force, the master controller controls the master actuator to generate the reaction force for operator. On the basis of the load impedance and the master slave error, the slave controller controls the slave actuator to perform a working task. The experimental researches confirmed that the operator not only obtains the force sense of the object accurately, but also obtains the deformation and stiffness senses of the object obviously.
Optimization Design of Elastic Coupling in Swashplate Engine Based on BP-GA
Authors: Kong Yan Feng , Zhang Zhen Shan , Cheng Guang Tao
Published: September 2010

Aiming at the fact that the current method of designing elastic coupling in swashplate engine is deficient, and the vibration damping effect is inadequate, a new method for optimization design of coupling is put forward based on back propagation artificial neural network and genetic algorithm(BP-GA). Firstly the dynamics model of swashplate engine shafting is set up, and the samples are gained by numerical simulation, then the non-linear mapping relationship of elastic coupling designed parameters of the objective function is established with BP neural network, finally the trained network is called back by GA to make global optimization. The optimization results show that the global optimal resolution can be searched rapidly and correctly with the method, besides, the method is precise, convenient and applicable.
Transient Analysis of Boost Converter Based on PSpice Software
Authors: Zhang Hou Sheng
Published: September 2010

Boost converter occupies a very important position in the area of switching power supply, it is widely used in various power equipment for a long time, while the transient working process from start to steady-state are not involved in textbooks and reference books available. PSpice is a powerful general purpose analog circuit simulator that is used to verify analog or mixed digital circuit design and to predict the circuit behavior. Its simulation waveforms are nearly as same as the experimental waveforms. The overall working stages of Boost converter, especially the transient process from start to steady-state, are simulated and analyzed by PSpice in this paper. All the stages of store energy element of Boost converter are also introduced. Some simulation waveforms are given to verify the analysis. Thus the understanding of Boost converter for designers is deepened.
Design of Fiber Optic Digital Telemetry System
Authors: Meng Tian Xing
Published: September 2010

The system uses the MCU to complete the functions such as regularly collecting, computing, error handling, storage, data transmission control, and so on, for the parameters required measurement. The system consists of four components: sensor and modulation circuit part, A/D transformation and send part, optical fiber coupling part and the receiver display part. The system has the following characteristics: The encoder is used to encode and send the digital signal of the measured parameters. Through the optical fiber coupling, this system displays the corresponding measurement parameters after decoding by the decoder. System circuit design is simple, easy debugging, reliable of information transmission, high precision of data transmission, particularly good anti-interference, no need of great sending power. It can be applied to a strong electric field or strong magnetic interference occasions at a distance from tens of meters to hundreds of meters.
Simulation and Verification on Motorcycle Ride Comfort under Pulse Road
Authors: Zou Xi Hong , Shi Quan , Zhang Xiong Xiong
Published: September 2010

Motorcycle Ride Comfort is the important performance of motorcycle. In this paper, a rigid-flexible coupling virtual prototype is developed with CATIA, ADAMS and NASTRAN tools. Combined with motorcycle road simulator, the simulation platform of motorcycle ride comfort is built. Then with the input of pulse road, motorcycle ride comfort is simulated, and the simulation results are verified by experiment results. It indicates that the simulation results have a high credibility and the road simulator provides a good method of verification for simulation of motorcycle ride comfort.
Convergence of Generalized Relaxed SSOR Method for Augmented Systems
Authors: Zhang Li Tao , Cheng Shao Hua , Huang Ting Zhu , Gu Tong Xiang
Published: September 2010

In this paper, we present the generalized relaxed SSOR method (GRSSOR)
for solving the large sparse augmented systems of linear equations, which is the extension
of SOR-like, GSOR and GSSOR methods. Furthermore, convergence of GRSSOR method
for augmented systems is analyzed, which show that GRSSOR method with appropriate
parameters will have very good effectiveness
Analysis of Influence Factors on Heavy Metal Release from Mine Waste Rock in Fu Xin Mine Area
Authors: Liang Bing , Jiang Li Guo , Lu Xiu Sheng
Published: September 2010

For analysis of influence factors on heavy metal release from different weathering mine waste rock in Fu Xin mine area under the effect of rain water leaching, the materials which come from mine waste rock pile nearby Xin Qiu mine is collected and then process a serial leaching experiments. The initial PH value of leaching solution and experiment temperature have been selected to as influencing factors according to rainfall and weather condition of Fuxin mining area. The concentration of five heavy metal elements: Cd, Cr, Cu, Mn and Pb are tested in leaching solutions. The results show that the constituent characteristics of stratum rock is a major factor influenced on leaching solutions and heavy metal release. The weakly acidic leaching solution becomes to weakly alkaline after leaching the waste rock. The quantities of different heavy metal release represent disparate rules, influenced by distinct weathering degree. Concentrations of Cd and Cr increase with the leaching solution's pH value variation while Cu, Mn and Pb decreased. Higher temperature leads more heavy metal elements release from the waste rock.
Multiparty Quantum Determined Key Distribution Protocol Using Open-Destination Teleportation
Authors: Zhao Qiu Yu , Li Xiao Yu , Zhang De Xi
Published: September 2010

A multiparty quantum determined key distribution protocol using open-destination teleportation is presented in this paper. Four parties can build a key using the technology of open-destination teleportation. Unlike in the previous protocols in which the key is a random string built in the process of key distribution, the key can be a determined string in our protocol. We prove that our protocol is guaranteed to be unconditionally secure by the laws of quantum mechanics.
A Creating Method of Underprop Project for 3-D Abnormal Space
Authors: Chui Ming Wei , Feng You Qian , Wang Wei , Hong Jun , Li Pei Lin
Published: September 2010

Aiming at the layout problem of underprop equipments in constructing 3-D abnormal space, a Creating method of underprop project is presented in this paper. By analyzing the underprop equipment and the 3-D abnormal space, the optimization model is built for underprop equipments layout. An optimization approach of the model is advanced, then the underprop project is presented. At last, an underprop project is made based on the method in this paper. According to the project, a 3-D space can be built quickly.
The Sleep EEG Partition by Stages Based on Complexity Measure
Authors: Yu Lan Lan , Meng Tian Xing
Published: September 2010

Sleep is the important phenomenon in human’s life. About third time of human is spent on sleeping in which many important physical course happen and develop so that the research of sleep EEG gets more and more regards. The beginning of sleep research often starts from right partition by stages. Different sleep stages correspond with different brain states so that the sleep partition by stages has important meaning for the research of the sleep EEG. In this paper, a method is given for sleep segmentation using Lempel-Ziv complexity. From the result of the simulation, it can be drawn that the complexity measure can helpful distinguish the sleep stages so it plays an active role to find a reliable guideline for the automatic partition of sleep stages in sleeping periods in time.
The Chaotic Behavior of Symmetric Laminated Composite Arch
Authors: Wang Jian Jun , Han Zhi Jun , Kang Chao , Lu Guo Yun , Zhang Shan Yuan
Published: September 2010

Chaotic motion of symmetric laminated composite arch with two hinge supports under transverse periodic excitation was investigated. The nonlinear dynamic equations of the arch are changed into the square-order and cubic nonlinear differential dynamic system by Galerkin method, and its homoclinic orbit parameter equations are also acquired. The critical conditions of horseshoe-type chaos are obtained by using Melnikov function. The influence of loading frequency on chaotic region are analysed by numerical calculation. The motion behaviors of system are described through the bifurcation diagrams, the time-history curve, phase portrait and Poincaré map. The results are given as follows. The influence of loading frequency on chaotic region are significant. When the height of arch reach some value, the system can occur horseshoe-type chaos. The system of symmetric laminated composite arch under transverse periodic excitation may occur steady motion and chaotic motion.
Building Safety Risks Induced by Settlement and Its Prevention Methods
Authors: Zhou Ai Zhao , Wang Wei , Li Na
Published: September 2010

Building is a complex and opening system, and settlement plays an important role in its safety. Settlement components of building are analyzed and their calculating methods are introduced. Based on growth of building settlement, three aspects of building safety risks induced by excessive settlement are analyzed, namely excessive differential settlement, total incline and disharmony with living environment. Four methods are proposed to reduce and prevent the risks caused by settlement, which include improving calculating method, determining soil mechanical parameter reasonably, predicting time-dependent settlement and optimizing design of the building foundation.
Free Modal Analysis of a 2-Cylinder Diesel Engine Cylinder Block
Authors: Zheng Zhong Cai , Liu Na , Gao Yan , Zhang Kun Jin , Chen Hai Ou
Published: September 2010

The three dimensional model of a 2-cylinder diesel engine block is established with the P ro/E software, and then the modal analysis of the engine block is carried out using finite element method with ANSYS software . Through the analysis, the inherent frequencies and mode shapes of the first 6 order modes are obtained respectively, and then are compared with the testing result; comparison shows the results of FEA estimation are in good agreement with those of testing which indicates the FEA results’ correctness. The results of the relative distribution of the vibration magnitude in the whole block are given, which provide necessary guides for the dynamic optimal design of the engine block.
Influence of Different Sliding Velocity on the Thermo-Mechanical Coupling of the Rough Surface Contact
Authors: Gao Cheng Hui , Huang Jian Meng , Dai Lei
Published: September 2010

Sliding velocity has a direct impact on friction heat and contact situation. Frictional heating and associated temperature seriously affects the material chemical and physical - mechanical properties, and is one of the direct factors on the wear mechanism. To analyze the influence of the sliding speed on the maximum contact temperature, contact pressure, stress, etc, a 3D thermo-mechanical coupling model for the rough surface frictional sliding is established. The rough surface is characterized based on fractal theory. The model considers friction contact between an elastic flat plane and an elasto-plastic rough surface. Also, the model integrates the heat flux coupling between the sliding surfaces and allows the analysis of the effects of elastic-plastic deformation of rough body and the interplay among asperities. The numerical results from the analysis and simulation show that the maximum contact temperature increases with the increasing of the sliding velocity. But the maximum VonMises equivalent stress and the maximum contact pressure have few relationships with sliding speed. They may increase or reduce with the sliding velocity increasing. Some results are validated by research’s results available in the literature.
Mechanics Modeling and Three-Dimensional Finite Element Simulating for High Speed Milling of Titanium Alloy
Authors: Yang Yong , Wang Yu Ling , Li Chang He
Published: September 2010

A three-dimensional finite element model of helix double-edge cutting is developed to study the ending milling process of titanium alloy Ti6Al4V. Several mechanics models of milling process, such as material constitutive model, friction model and heat transfer model, are implemented to improve finite element simulating accuracy. A milling force experiment is carried out, and a good agreement between simulation and experimental value is achieved, which proved that the finite element model presented in this paper is correct. Using this finite element model, chip formation and cutting temperature are simulated and analyzed. This work will be a base for process parameter optimization, tool’s optimization selection and design during high speed milling of difficult-to-cut titanium alloy.
Tribological Performance of Hybrid PTFE/Nano-EG Composites Reinforced with Nanoparticles
Authors: Jia Zhi Ning , Yang Yu Lin , Fan Bing Li
Published: September 2010

The tribological tests were conducted on several PTFE/nano-EG solid self-lubricating composites filled with different nano-particles such as nano-Al2O3, nano-copper, nano-SiO2 and nano-TiO2. The Friction coefficient, wear rate, worn surface morphology and transfer film were studied. It was found that the present filler additions can remarkably increase wear resistance in all composites researched in the paper. The friction coefficients of these composites were lower than that of pure PTFE. The experimental results indicate that the enhancement effect of nano-particles effectively improved anti-friction and wear resistance of these composites. The highest wear resistance was found for composites containing (a) 10%nano-EG+10%Al2O3, (b) 10% nano-EG + 20% nano-Cu and (c) 10%nano-EG+nano-SiO2. Scanning electron microscopy (SEM) and optical microscope (OM) were utilized to examine the worn surface of PTFE-based composite and transfer film generated on counterface. Also, the dominant wear mechanisms and mode of failure were studied.
A New Design Method for Waste Gas Efflux Self-Sucking Device Based on the Isentropic Gas Flow Theory
Authors: Li Chuan Jun , Shi Wei Dong , Wang Xin
Published: September 2010

In order to meet the demand of designing the waste gas efflux self-sucking device simply and practicably, based on the single-phase isentropic gas flow theory, a more effective theory analysis and design method was presented. The device’s main working parameters and characteristic indexes that had a signification effect in practice application were analyzed and given. And their calculating means were put forward. Some model was designed by this way and the parameters were analyzed by comparison with experiments. The result of the calculating case shows that the calculated data accord with the experimental data. And the method has good reliability with simpleness and practicality, which provides a good way of designing the self-sucking device.
Experimental Study on Flexural Behavior of Recycled Coarse Aggregate Concrete Beam
Authors: Bai Wen Hui , Sun Bin Xiang
Published: September 2010

In order to investigate flexural behavior of simply-supported beam using recycled coarse aggregate concrete, the difference of the component normal section stress distortion performance and failure characteristic between the recycled concrete beam and the normal concrete beam is researched. The approaches of testing the flexural behavior of 6 recycled course aggregate beams with the same section size, different replacement ratio of recycled coarse aggregate (0%, 50%, 70% and 100%) and different percentage reinforcement (0.68%, 0.89% and 1.13%). Based on the experimental the following conclusions are draw. There are also 4 phases of elasticity, cracking, yield and ultimate during the stress course of recycled concrete beam component normal section stress; the average strain measured on cross-section obliges to the plane section assumption; the characteristics of stress distortion and destruction of recycled concrete beam are basically the same as those of the normal concrete beam. Under same conditions, the cracking moment and the ultimate flexural carrying capability of recycled concrete beam is almost the same as those of normal concrete beam. The deformation of recycled concrete beam is larger than concrete beam. The conclusion of the paper is that it is still feasible to calculate the ultimate bending moment, cracking moment, and the biggest crack width of recycled concrete beam according to the formula in China Concrete Structure Design Code, but the deflection formula needs to be adjusted.