bluuebunny/crossref_metadata_2025 huggingface dataset:
Combining Item Rating Similarity and Item Classification Similarity for Better Recommendation Quality
Authors: Zhou Kai
Published: February 2012

Recommender systems are becoming increasingly popular, and collaborative filtering method is one of the most important technologies in recommender systems. The ability of recommender systems to make correct predictions is fundamentally determined by the quality and fittingness of the collaborative filtering that implements them. It is currently mainly used for business purposes such as product recommendation. Collaborative filtering has two types. One is user based collaborative filtering using the similarity between users to predict and the other is item based collaborative filtering using the similarity between items. Although both of them are successfully applied in wide regions, they suffer from a fundamental problem of data sparsity. This paper gives a personalized collaborative filtering recommendation algorithm combining the item rating similarity and the item classification similarity. This method can alleviate the data sparsity problem in the recommender systems
Effect of Color Shading Nets on Growth and Nutrient Uptake of Flowering Chinese Cabbage
Authors: Song Shi Wei , Yan Qiu Yan , Dong Fei , Liu Hou Cheng , Sun Guang Wen , Chen Ri Yuan
Published: February 2012

The effect of color shading-nets (red net, blue net and silver net) and ordinary black net on plant growth and nutrient uptake of flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) were studied, with no net shading as the control. The results indicated that, compared with the control, red net covering increased plant height, leaf area and stem diameter of flowering Chinese cabbage. Red and blue nets covering enhanced the above ground fresh weight, while the silver and black nets covering decreased the above ground fresh weight. Shading net covering significantly improved the nitrogen (N) and potassium (K) content of flowering Chinese cabbage, while it had no significant effect on the phosphorus (P) content. Red and blue nets covering enhanced mineral nutrients uptake, while it was decreased under silver and black nets covering. Red and blue nets covering promoted plant growth and nutrients uptake of flowering Chinese cabbage and could be widely applied in leaf vegetable production.
Applications of Transport Unit Based on Panasonic A5 Servo
Authors: Xie Zhong Zhi
Published: February 2012

Automatic production line is a set number of technology as an integrated control systems, automation technology, Mechatronics technology, is one of the important elements of professional practical training of students, is also required in a production challenges. Through multiple times to the actual workflow study, finalized in conveying unit using PLC control of automatic production line, at the same time with Panasonic A5 servo motor as the drag, so that both meet workpiece Machining accuracy requirements, and greatly improves efficiency
Comparison of Earthquake Cases and China Public Safety Early Warning Information
Authors: An Hong Chang
Published: February 2012

This paper illustrates China Public Safety Early Warning Information on the basis of comparing some successful and unsuccessful earthquake cases. Structure and functions of China Public Safety Early Warning Information are shown. Weaknesses of China Public Safety Early Warning Information are also pointed out. Some improvement of China Public Safety Early Warning Information is looked into.
The Research of Supply Chain Based on Fourth Party Logistics Optimization
Authors: Li Wen , Wu Meng Yun , Mei Qiang
Published: February 2012

With the economic globalization and the rapid development of high-technology, the traditional competition between enterprises has gradually evolved into the competition between the supply chains. It is described the structure models of supply chain and problems existing in the supply chain management, focuses on the comparison between the fourth party logistics and the third party logistics, based on the excellent management ability of the fourth party logistics and its ability to plan and design the supply chain. It is studied how to optimize supply chain through the fourth party logistics in the paper.
A Design and Numerical Study of Flying-Plate Initiating System
Authors: Wang Zai Cheng , Yang Wei Ling , Jiang Chun Lan
Published: February 2012

In order to form plane shock wave in explosive charge after detonation ,a flying-plate initiating system was put forward. The principle of material selection, the shape and incline angle of flying-plate were defined by theoretical analysis and calculations. The velocity of flying-plate, distance of between flying-plate and driving charge was analyzed and calculated according one-dimensional driving theory. The working process of flying-plate initiating system was studied by numerical simulation and the simulation results show flying-plate initiating system is reliable way to initiate main charge and form good plane wave.
The Research of Solar Heating System for Wild Barrack
Authors: Dong Peng Min , Zhao Bo , Zhu Zong Liang , Qiang Yong Dong , Yao Zhi Gang , Zhang Hai Dong
Published: February 2012

This article is based on China's Gansu Jiuquan areas of natural environment,in view of field operations commonly used wild barrack winter heating requirements,design the solar energy storage and auxiliary electrical heating heating system,and the flat collector to use double working medium indirect heating mode,with antifreeze as collection hot flowing,with water as storage and heating medium,effectively solved the extreme temperatures anti-freeze、guard against sandstorm problem,achieve the safe、energy-saving and environmental protection heating goal.
Additive-Multiplicative Hazards Model with Recurrent Event Data
Authors: Liu Huan Bin , Ye Ying
Published: February 2012

In this paper, the additive-multiplicative hazards model with gap time data of recurrent events is studied. Based on this model, two cases are discussed, i.e., the observed data are gap time of recurrent event, and the observed data are a group recurrent events recurrence one time, and the parametric and nonparametric estimations are given. Then the efficiency of estimators for these two cases is compared.
Simulation of Vibrating Forming Process of Concrete Brick Based on DEM
Authors: Yao Ping Xi , Zhao Liang Jiang
Published: February 2012

The forming compact process of the concrete brick in vibration is simulated based on three-dimensional discrete element method (3D-DEM) where the crude granular materials of the concrete brick are simplified into two spherical particles of different sizes. There are three zones affecting compactness in vibration including porous zone, compact zone, and compact stable zone. The compactness's variation of the different heights and the above three zone are analyzed when both the amplitude and the frequency are different. By orthogonal experiment the result is showed that the average compactness is best when the amplitude is about 4 mm and the frequency is 100 Hz.
Design of the Magnetic Separation Column Overflow Liquid Surface Monitoring System Based on Digital Image
Authors: Wang Qing Hui , Wang Qi Wei
Published: February 2012

The design has developed a the digital image processing system used to identify the magnetic separation column overflow liquid surface state, it identifies overflow liquid surface of normal situation and iron ore powder leak situation, and the system is partly implemented with visual C++ programming. The system consists of image processing and pattern recognition of two parts. The system can be calculated using magnetic separation column overflow the liquid surface texture parameters related, through these texture parameter and image recognition experiment set up some samples and, thereby, to identify parameter variation of the overflow the liquid surface provide reliable data basis.
Research on the Impact of Climate Cactors on Wood Width Based on the Improved RBF Model
Authors: Yue Qi , Lv Zhuo Ran , Guan Xue Mei
Published: February 2012

Choosing cathay poplar as research object ,with the aim to reveal that how the climate change may affect the wood formation, by using the improved RBF neural network the paper studies the affects of the climate factors such as temperature, sunhine, rainfall and ground temperature on the physical properties of cathay poplar plantation and establish a prediction model finally. The simulation was carried out and the results shows that the error is less than 2.8%.
Research on Key Technologies of Drought Monitoring and Forecasting Platform Based on GIS
Authors: Ma Li , Zhang Bo , Liu Wei , Ma Xiao Xiao
Published: February 2012

In order to rapidly develop the business of drought monitoring and warning server, some convenient software and systems are developed in many provinces. However, these software systems have some defects in some way. Such as managing and querying a large number of meteorological information, analyzing and processing geographic spatial data. To solve these problems, this paper establishes a public platform of drought monitoring and warning based on GIS. It researches about data transformation, selection of the drought index and other related technologies. The results will benefit the business of Northwest drought prediction and monitoring, and provide a scientific basis for disaster prevention and reduction of some relevant departments.
Modeling Copper Prices: Ornstein-Uhlenbeck Process and Jump-Diffusions
Authors: Li Xi Bing , Hu Yu Xi , Zhang Zhen Zhong , Liu Xin Ru
Published: February 2012

In this paper we focus on parameter estimation of the futures price processes with a Ornstein-Uhlenbeck process and jump-diffusions. We use the generalized moment method to derive the OU process. Afterwards, we fit a jump diffusions model to Copper prices from Shanghai Copper futures market.
Investigation of Low Energy Nitrogen Ion Implantation into Gold
Authors: Yang Jian Hua
Published: February 2012

Noble metal nitrides have stimulated many theoretical and experimental studies on account of their abnormally high bulk modulus and intriguing electronic properties. Gold surfaces are implanted by the nitrogen ions of low energy in the present work. The surface morphology are observed by atomic force microscopy (AFM).The surface microstructure are studied with X-ray diffraction (XRD). The results of XRD and AFM show weak evidence for the formation of a nano-scale gold nitride. The nitrogen concentration depth profile in gold film has been calculated using a dynamic computer simulation to determine the possible crystal structure of the Au-N system. The mechanisms of gold nitride formation are discussed in the end.
Constant Scallop Height Algorithm of Self-Adaptive Tool Orientation with Toroidal Cutter
Authors: Chen Ying , Wang Yi Qiang , Tian Chun Yan
Published: February 2012

Using a 5-axis NC machining tool enables the tool to be oriented in any spatial direction to access a given point. This means interference can be avoided and the position of the tool can be optimized. This paper presents a new approach to generate gouging-free tool paths for constant scallop-height machining using 5-axis toroidal milling. We consider cutter positions, which guarantee local gouging avoidance. Based on second order approximations of the machined strip width, we present locally optimal cutting positions for cutting directions. The largest machined strip width of constant scallop height and the corresponding gouging-avoidance tool orientation are calculated. The effectiveness of the present approach is demonstrated through the comparing of tool path, velocity curve and acceleration curve of a typical sculptured surface, which generated by the present approach and the conventional constant scallop height. The results indicate that the present constant scallop-height machining achieves the specified machining accuracy with fewer and shorter tool paths than the existing tool path generation approaches. The dynamics is better, too.
The Constructing of Integrated Remote Monitoring System for Cold Store
Authors: Zhang Meng Ya , Zhang Qing Ying , Chen Zhi Min , Chi Ying
Published: February 2012

Being an important node of cold chain logistics, the cold store has to be monitored and managed remotely in real-time, which is very important to operate the whole system effectively. With the help of wireless sensing network and other advanced techniques, a cold store remote monitoring system is set up, which is composed of digital video surveillance system, refrigeration control system and fire alarm system etc. Cold store is then monitored in a long range and managed systemically. The security and reliability of the cold store is guaranteed effectively.
Study on Optical Constants of DLC Thin Films Based on Modified Genetic Algorithm
Authors: Li Jian Chao , Su Jun Hong
Published: February 2012

This document modified the basic genetic algorithm three important operator—selection operator, mutation operator, crossover operator drawing from competition, selection, and fitness niche adjustment idea. Take the unbalanced magnetron sputtering deposition of DLC films on Si substrate as a research sample. When fitting wavelength range is 300 ~ 1500nm, select a point every 1nm, the fitting lasting time is no more than 6s. Fitting results contrast to ellipsometer’s fitting results; the error is less than 2%. Experiments show that: the adaptive modified is effective in preventing the "premature" phenomenon, searched the global optimal, reduces the requirements on the operator to set the initial value on the fitted model and is effectiveness to fit thin film optical constants.
An Overview to Soft Switching Converters with High Voltage Gain
Authors: Khaledian Amir , Abdi Babak , Moghani Javad Shokrollahi , Abedi Mehrdad
Published: February 2012

A comparison is made in this paper between three high voltage gain converters. The first one is a boost converter with an additional level including a coupling inductor for increasing the voltage gain. The second is a converter that is capable to be extended to N parallel converter and the third one uses a clamp circuit to increase gain with a coupled inductor. Three converters are compared in voltage and current peak value and utilization coefficient of active switch and output diode, their ZVS and ZCS condition in the ON and OFF time and voltage gain. Finally the first converter circuit is simulated in PSpice with the two other converters input voltages and the results are compared.
High Speed Transaction Hardware Channel in Loosely-Coupled Reconfigurable Computing Emulation System
Authors: Zhang Bo Wei , Gu Guo Chang , Zhang Xing Zhou , Liu Dong
Published: February 2012

The loosely-coupled reconfigurable computing model includes the host microprocessor in conjunction with an external stand-alone reconfigurable hardware which takes advantage of low cost in technology and development time. It can work as a fast emulation approach to study reconfigurable computing prototype system. One of the key features of such emulation system is the ability to perform the communication. In this paper, we proposed a high speed hardware channel with direct memory access(DMA) transaction method based on Xilinx ML555 development kit and PCI-express(peripheral component interconnection express) endpoint block IP. Experiments show that both read and write transaction speed in this design meet the theoretical maximum speed.
A Design Method of Multiple Protocols Communication Module in Semiconductor Equipment Simulation Platform
Authors: Wang Wei , Zou Long Qing , Xu Hua , An You Wei , Jia Pei Fa , Li Bo , Luo Yuan
Published: February 2012

This paper presents a design method for communication module design in semiconductor equipment simulation platform. There are several kinds of standardized protocols in semiconductor equipments intra communication, the method with which these standardized protocols can be configured and integrated in single simulation platform. These protocols can be configured statically and dynamically respectively. In static state, protocol configuration provides various protocols for chosen and edit. In the dynamic state, the virtual devices can be communicated with control system with communication module. As a case study, a process chamber system simulator with designed the communication module has been illustrated. The designed communication module accomplishes the data transmission between control system and the chamber simulation system. The devices in chamber system receive the instruction form control system and execute the required actions. The experiment results show that the simulation platform is feasible and effective.
Engineering Optimization for Tar Removal Process in Corn Straw Gasification
Authors: Li Da Zhong , Wu Ying Jie
Published: February 2012

The LS-SVM(the least square supporting vector machine) model of tar removal process by catalytic cracking in corn straw gasification was established according to the experimental data in [2]. On this base, a multi-objective optimization function was put forward, by which the Pareto-optimal solutions were gained in a single run. From the perspective of engineering optimization, the efficient solutions that are suitable for power generation and gas supply were selected respectively from the Pareto-optimal solutions by analysising different demands for gas.
Multi Robot Exploration through Pruning Frontiers
Authors: Pal Anshika , Tiwari Ritu , Shukla Anupam
Published: February 2012

In this paper, an approach to multi robot exploration is presented. One of the key issues in multi robot exploration is how to assign target locations to the individual robots and how to better distribute the robots over the environment. The proposed technique applies a well-known unsupervised clustering algorithm (k-means) in order to fairly divide the space into as many disjoint regions as available robots. Hungarian Method is used for the assignment of robots to the individual regions with the task to explore the corresponding area. To drive the robots around the environment, a frontier ‘regions on the boundary between open space and unexplored space’ based navigation strategy is used to decide where to move next, according to the data collected so far. Furthermore, we discuss improvements to the frontier based exploration strategy, by pruning the frontier cells that further reduces the computational time. The numbers of candidate locations are evaluated based on three criteria: number of unknown cells, number of known cells and real path travelling cost. Simulations are presented to show the performance of the proposed technique. This method can best be applied in search and rescue operations, partitioning helps to explore different regions of the workspace parallely by different robots instead of concentrating efforts in particular spot, pruning helps to make movement decisions much faster, the result is that the potential victims in a region will not have to wait much longer.
Single Crystal Alloy on the Creep Behavior of Holes in Three-Dimensional Finite Element Simulation
Authors: Zhang Shu , Meng Lei
Published: February 2012

Based on finite element Method a dynamic mathematical model is established, and the simulation of stress distribution around the defects of single crystal nickel-based superalloysis also established with ANSYS. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure defects. During high temperature creep, the stress isoline near the holes region displays the feature of the acetabuliform distribution, and possesses the bigger stress value at 45 angle direction relative to the applied stress axis. That results in the  phase transformed into the rafted structure at 45 angle direction relative to the applied stress axis, and the circular holes defects are elongated into the ellipse in shape along the direction parallel to the applied stress axis. During creep, a smaller value of the stress distribution displays in the up and down regions of the circular holes, and the maximum value of the stress distribution exhibits the apices region in the sides of the hole.
Study on Injection Type Hybrid Active Filter with Predictive Current Control
Authors: Zhai Xiao Dong , Zhao Chen , Wang Mo , Qian Hong Wen , Sun Hu
Published: February 2012

In this paper, the mathematical model of injection type hybrid active filter is established, then the current one-step predictive control is introduced with model predictive control (MPC) technology. PI controller is used in DC voltage control and its parameter is gotten by particle swarm optimizer (PSO) algorithm. Finally, the simulation model of IHAPF is established in MATLAB/SIMULINK, and the control method presented in this paper has better dynamic and static performance which is verified by the simulation results.
Boiler Steam Pressure Control System Based on Fuzzy Control
Authors: Zhou Yi Heng , Yang Long Yue , Pu Hai Lin , Zhao Zi Yu , Liu Fei , Chen Zheng
Published: February 2012

Industrial boiler steam pressure is an important measure of boiler normal operation. Since there is delay and inertial part, single-loop PID control is difficult to achieve good dynamic characteristics. By analyzing the characteristics of the steam pressure controlled object, this paper presents a fuzzy adaptive PID control based on the cascade control system. Finally, in order to analyze the effect of the control system, mathematical model was constructed by MATLAB simulation to compare fuzzy adaptive PID cascade control with conventional PID control. The results prove that the former has a good control effect.
Research of a Novel Full-Digital Control ZVZCS Full-Bridge PWM DC / DC Converter Based on ARM7
Authors: Tang Lin , Liu Xing Qiao , Qiu Guang Yu
Published: February 2012

A new full digital control method has been proposed. This method employed an advanced main circuit topology combining with an ARM MCU. Using the state space averaging method and following the method deriving the small-signal model of Buck converter, the small-signal characteristics model of DC/DC converter can be derived. Using no steady error quadratic optimal control method, the problem of PID parameters is transformed into solving optimal feedback coefficient matrix, the digital controller of full-bridge DC/DC converter can adjust the parameters online. The power supply can realize leading leg’s ZVS and lagging leg’s ZCS in a big load range. The whole system has concise hardware structure, reliable control method and good man-machine interface, so it has high practical value.
Induction Power Supply System for Power Transmission Line Inspection Robot
Authors: Yang Ming Bo , Liang Zi Ze , Li En , Zhang Kai Liang , Yang Guo Dong
Published: February 2012

In order to prolong continuous working time of one transmission line inspection robot, a power supply system with induction charging unit for this inspection robot is introduced in this paper. Special current transformer by which the robot could get power from power line is designed according to the magnetic field condition around the transmission line. Besides, charging circuit for Li-battery pack is also introduced. A fly-back circuit is applied in the circuit to provide precisely accessible input power for charging battery packs. Experimental results show that the power supply system could have good performance on extending the continuous working period of the transmission line inspection robot.
Considerations on Decisions Making Process under the Risk of Terrorism
Authors: Cioaca Catalin , Boscoianu Mircea
Published: February 2012

This paper offers a decision making process based on terrorism risk. The purpose of the model is to support effective decision making in order to involve multiple potential targets and countermeasure alternatives. Because of the complexity of the issues and the posible catastrophic consequences of a terrorist attack, it is necesary to use an analytical tool to detect, assess, warn, response, and recovery the critical infrastructure. The perspective taken is that in order to establish priorities for threats and vulnerabilities and to identify and evaluate options for action.
Proportional Pneumatic Distributor
Authors: Avram Mihai , Bucşan Constantin , Constantin Victor
Published: February 2012

This paper deals with the design of a new type of proportional pneumatic actuator developed by the authors. The working principle and the design and built of the experimental model are presented. The stand used to determine the working characteristics of the experimental model are also presented.
Impact of 3D Seismic Technologies on Sedimentology Study
Authors: Duan Ru Tai , Jin Zhen Kui , Suo Chong Hui
Published: February 2012

Progress of 3D seismic technologies has played a vital role in the developments of sedimentology in terms of analytical methodology and concepts. High-density and high-resolution 3D seismic data can be used to reconstruct 3D views of sedimentary paleo-evironment by direct imaging of depositional elements and can also be used to analyze sedimentary paleo-evironment evolution in 3D detail by mapping facies variability at a specific geologic time by slicing though it. And such data connected with well logging data can be used for predictions of rock properties distribution to delineate sedimentologic heterogeneity. High resolution of 3D seismic data mapping can also be used to image the geometry of diagenesis front to a resolution of a few meters over thousands of square kilometers, which is a new approach to the study of diagenesis process in basin scale. The potential for future developments in this field is considerable. Relative methods and examples of such Studies on the aspects mentioned above are presented.
Study of Sol-Gel Auto-Combustion Method Prepare Ni0.6-xZn0.4MgxFe2O4
Authors: Zeng Ai Xiang , Yuan Jun
Published: February 2012

Ni 0.6-xZn 0.4 Mg x Fe 2 O 4 were synthesized by sol-gel auto-combustion method with Zn(NO 3.) 2 •6H2O. , Ni(NO 3.) )2•6H2O. , Mg(NO 3.) )2•6H2O. , Fe(NO 3.) )3•9H2O. , COOO2. and NH3•H2O. X-ray diffraction (XRD) analysises show that the sample is single phase and the doping of magnesium makes no difference to nickel-zinc ferrite’s crystal structure; nickel-zinc ferrite has formed after auto-combustion. Scanning electron microscope analysises show that after sintered the sample’s size is more even and the doping of magnesium makes the size smaller and more even too.
A Web-Lab Environment for the Study of the Job Shop Problem
Authors: Alvares Helmar , Aude Eliana Prado Lopes , Lopes Ernesto Prado
Published: February 2012

This work proposes a Web-Based laboratory where researchers share the facilities of a simulation environment for parallel algorithms which solves scheduling problems known as Job Shop Problem (JSP). The environment supports multi-language platforms and uses a low cost, high performance Graphics Processing Unit (GPU) connected to a Java application server to help design more efficient solutions for JSP. Within a single web environment one can analyze and compare different methods and meta-heuristics. Each newly developed method is stored in an environment library and made available to all other users of the environment. This amassment of openly accessible solution methods will allow for the rapid convergence towards optimal solutions for JSP. The algorithm uses the parallel architecture of the system to handle threads. Each thread represents a job operation and the number of threads scales with the problem’s size. The threads exchange information in order to find the best solution. This cooperation decreases response times by one or two orders of magnitude.
Algorithm for Selection of Simulation Software
Authors: Hlubeňová Jana , Hlubeň Daniel
Published: February 2012

A lot of performance products designed for the simulation of manufacturing systems is currently available on the market. Some of them are designed exclusively for logistics, others are designed to simulate the robotic workplace and some of them allow simulation the entire virtual enterprise from its logistics to the entire workplace connected to the real system. The article describes the algorithm for choosing the most suitable simulation program.
Assisted Research of the Dynamic Neural Networks with Time-Delays and Recurrent Links
Authors: Olaru Adrian , Olaru Serban , Paune Dan
Published: February 2012

The paper showed the assisted research of one new model of digital dynamic neural network by using the LabVIEW proper virtual instrumentation and proper mathematical model. In the research were used some different way to optimize the convergence process, for example: using one time- delay of the first and second output from the neural layers; using the recursive link and time- delay; using the bipolar sigmoid hyperbolic tangent sensitive function replacing the sigmoid simple sensitive function. By on-line simulation of the neural network it is possible to know what will be the influences of all network parameters like the input data, weight, biases matrix, sensitive functions, closed loops and time- delay, to the gradient errors, in a convergence process. By on-line using the proper virtual LabVIEW instrumentation, were established some influences of the network parameters: number of input vector data, number of neurons in each layers, to the number of iterations before canceled the mean square error to the target. In the optimization research we used the minimization of the gradient error function between the output and the target.
Computers Modeling and Simulation
Authors: Daneshjo Naqib
Published: February 2012

Modeling and Simulation is a discipline for developing a level of understanding of the interaction of the parts of a system, and of the system as a whole. The level of understanding which may be developed via this discipline is seldom achievable via any other discipline. A simulation is the manipulation of a model in such a way that it operates on time or space to compress it, thus enabling one to perceive the interactions that would not otherwise be apparent because of their separation in time or space. A model is a simplified representation of a system at some particular point in time or space intended to promote understanding of the real system.
Optimal Design of the Mechanical Systems Using Parametric Technique & MBS (Multi-Body Systems) Software
Authors: Alexandru Cătălin
Published: February 2012

The paper approaches the optimal design of the mechanical systems based on parametric technique in MBS (Multi-Body Systems) environment. The optimization process is developed in five steps: parameterizing the virtual model for creating the relations between the objects (points, markers, bodies, constraints, forces), defining the design variables, defining the design objective and constraints, performing parametric studies in order to identify the sensitivity of the design objective at the modification of the design variables, and optimizing the model on the basis of the main design variables (with great influence on the design objective). For applying the optimization procedure, a solar tracking system used for increasing the energetic efficiency of the photovoltaic modules has been considered. The study is performed by using the MBS environment ADAMS of MSC Software.
Substructure-Joint Based Approach to Damped FE Model Updating of Complex Assembly Structure
Authors: Soleimanian Parivash , H.Sadeghi Morteza , Tizfahm Akbar
Published: February 2012

Model updating techniques are used to update the finite element model of a structure, so that updated model can be predicted the dynamic behavior of an actual assembly structure more accurately. Most of the model updating techniques neglects damping and so amplitudes of vibration at resonance and antiresonance frequencies cannot be predicted by using of these updated models. In dynamic design of structures predicting of these properties is necessary. This paper presents a new technique to create an accurate finite element (FE) updated model of complex assembly structures consisting of substructures and real joint by considering damping of them. Given the fact that modal testing of real joints (such as bolt with some washers) are almost impossible. The updated model of assembly structure is obtained in four steps. In the first step, mass and stiffness matrix of substructures, joint and assembly structure are updated using modal data and Eigen-sensitivity approach. In the second step, damping of assembly structure is identified using complex modal data and updated mass and stiffness matrices which are obtained in first step. In the third step, the effect of damping of joint on frequency response functions (FRFs) extracted from updated model was shown. In the forth step, damping matrix of joint is updated by using FRF-based model updating method and finally damped updated model of assembly structure compared with measured data.
The Application of the Minimum Cut Sets in Reliability Evaluation of Power Transmission and Transformation System
Authors: Cai Jing , Li Fang , An Ning , Lu Jing Jing , Sun Lu
Published: February 2012

As an important part of power systems, power transmission and transformation system involves various equipments, complicated structure and operation modes, and its reliability level has a significant influence on the reliability of the whole system. The paper proposes a practical method for reliability evaluation of power transmission and transformation system based on minimum cut sets. The algorithm, based on topological structure and reliability data without power flow, analyses the reliability of system by different voltage grades. In each voltage grade analysis, the method resolves minimum path sets by depth first search method, gets minimum cut sets, and calculates reliability index. The method considers three states involved normal operating, schedule repair and fault repair, and it makes the evaluation process much more reasonable and effective as it resolves branch-node mixed cut sets. The paper verifies the effectiveness of the algorithm by the test of IEEE-RTS 79 system
CAD Optimal Design, Documentation and Automated Assembly of Mechanical Product
Authors: Dinev Georgi , Malakov Ivo , Dotsev Dobrin
Published: February 2012

As a result an optimal structural variant for automated assembly and algorithm for analytical and experimental determination of the trajectory of an assembly robot has been chosen. The criteria for the choice of an optimal structural variant and an approach for searching assembly variants of mechanical products in CAD medium are developed. Algorithms for the choice of optimal structural variant in resolving optimization problems in conditions of under determination were developed. Based on the proposed algorithms application software was developed and its efficiency and working capacity by solving test-problems was proved. The developed technological schemes, constructional documents and the based optimal variant for automated assembly will be used in training students on “Bases of construction and CAD” in Department “Bases and technical means for construction” and on “Assembly Automation” in Department “Automation of discrete production”. The obtained results can be used also by firms and enterprises in accomplishing constructional, design and consulting activity in the field of assembly automation. It is expected that the results will be efficiently applied also by little and medium size firms.
CAD-Geometrical Modeling of a Hydro Mechanical Product
Authors: Dinev Georgi , Baltova Lyudmila Ivanova
Published: February 2012

The article presents the methodological geometrical modeling of a hydro mechanical valve within a CAD environment. There has been summarized an approach for the creation of 3D geometrical models of the compound details and the assembled unit. Methodology and didactical materials have been developed which are to be used for teaching in Basics in designing and CAD. An analysis of the kinematics of the mechanical product has been made as well as a dynamic model for animation. The obtained results might be used for the purpose of designing and researching of this type of products.
Design of Digital Controllers for Permanent Magnet Torque Motors
Authors: Ebrahimi M. , Jazayeri Seyed Ali
Published: February 2012

The design of control system can be divided into two steps. The plant has to be converting into mathematical model form, so that its behavior can be analyzed. Then an appropriate controller has to be design in order to get the desired response of the controlled system. In this paper, the linear model of a Permanent magnet torque motor (PMTM) is considered and three controllers, digital PID controller with two forms of positional and velocity, a deadbeat controller and pole placement controller method are designed and due to a comparing between their, the best controller for this kind of plants will be chosen.
Design of Power Quality Monitoring System
Authors: Li Yi , Li Meng
Published: February 2012

According to the rapid development of modem industry, and many power and electronic equipment been used in power system, the quality of power is more and more important. This paper analyzes the cause of power quality, and then designs the hardware system of power quality monitoring system. Based on this, a software system with graphics user interface is also designed in this paper. Finally, after experiment, it shows this power quality monitoring system is friendly to use with stable performance
Reaction Mechanisms of Li5La3Ta2O12 Powder with Ambient Air: H+/Li+ Exchange with Water
Authors: Wang Wei Guo , Fang Qian Feng , Hao Gang Ling
Published: February 2012

The proton/lithium exchange property of the garnet-related lithium-ion conductors Li5La3Ta2O12 is shown to occur at room temperature under ambient air. The internal friction, TGA analysis, and IR spectroscopy techniques are used to investigate the reaction mechanism. XRPD analysis demonstrates the topotactic character of the exchange reaction. The water gas in ambient air is adsorbed on the grain surface and then to exchange proton for lithium ion into the garnet structure,(Li5-xHx)La3Ta2O12. The H+/Li+ exchanging processes are reversible. When the measured temperature is higher over 573K, the internal friction peak gradually shifts toward lower temperature and the like garnet-like phase is recovered.
Mathematical Modeling of Management Decision Activities with Maximum Risk in the Intelligent Robotic Systems
Authors: Dumitru Constantin , Contoloru Violeta Cristina , Cherciu Mirela
Published: February 2012

The aim of shaping management empathy is to know future specialists performance and their improvement in human-computer-machine dialogue. Therefore, we’ve defined the concept of management empathy and we’ve built fuzzy models that allowed the quantification of the empathic level manager-executed in the idea of increasing human elements of the correlation educator-teacher. Management decisions in the final forms benefit both from the archemic-systemic design and the mathematical models able to quantify intelligent robotic systems to its highest performance. This goal requires minimum effort and efficiency as high as possible in the processes and robotic systems. The final optimal solution fully reflects the innovative archemic-system design if and only if the information entropy of intelligent robotic systems is minimal under full compliance with environmental restrictions.
Research on Adsorption of H2S by Modified Activated Carbon
Authors: Qin Hong , Wu Du Xue , Wang Qing
Published: February 2012

Activated carbon was modified by urea, potassium hydroxide and potassium respectively. The porosity of the samples properties was analyzed by nitrogen adsorption. Then it was used as adsorbent to catalyze and absorbed H2S from the gas based on dry distillation. The experiments in this paper were carried to study the effects including H2S concentration, impregnating solutions on adsorption of H2S on the modified activated carbon. The results showed that the adsorption capacity of the modified activated carbon was relevant with the kinds of pickling liquid and experimental conditions, On the whole, The lower was concentration of H2S, the higher would adsorption capacity of modified activated carbon be. At the same time the experiments also analyzed the samples of surface oxidation products through thermogravimetric analysis.
Probabilistic Finite Element Prediction of the Active Lower Limb Model
Authors: Corneliu Arsene
Published: February 2012

The scope of this paper is to explore the input parameters of a Finite Element (FE) model of an active lower limb that are most influential in determining the size and the shape of the performance envelope of the kinematics and peak contact pressure of the knee tibial insert introduced during a Total Knee Replacement (TKR) surgery. The active lower limb FE model simulates the stair ascent and it provides a more complicated setup than the isolated TKR model which includes the femoral component and the tibial insert. It includes bones, TKR implant, soft tissues and applied forces. Two probabilistic methods are used together with the FE model to generate the performance envelopes and to explore the key parameters: the Monte Carlo Simulation Technique (MCST) and the Response Surface Method (RSM). It is investigated how the uncertainties in a reduced set of 22 input variables of the FE model affect the kinematics and peak contact pressure of the knee tibial insert. The kinematics is reported in the Grood and Suntay system, where all motion is relative to the femoral component of the TKR. Reported tibial component kinematics are tibio-femoral flexion angle, anterior-posterior and medial-lateral displacement, internal-external and varus-valgus rotation (i.e. abduction-adduction), while the reported patella kinematics are patella-femoral flexion angle, medial-lateral shift and medial-lateral tilt. Tibio-femoral and patella-femoral contact pressures are also of interest. Following a sensitivity analysis, a reduced set of input variables is derived, which represent the set of key parameters which influence the performance envelopes. The findings of this work are paramount to the orthopedic surgeons who may want to know the key parameters that can influence the performance of the TKR for a given human activity.
Design and Implementation of Embedded Wireless Smart Gateway Based on PXA270
Authors: Kang Hong Yan
Published: February 2012

To release the connection problem between two different wireless communication technologies in conventional smart home system, a new embedded wireless smart based on PXA270, Zigbee and GPRS was designed. Web server was built on embedded system which uses PXA270 as core, and the exchange of information between internal network and the Internet via Zigbee module and GPRS module. ZigBee network mainly for short-distance communication and the GPRS network mainly for long-distance communications, so they can on the basis of complementary advantages to achieve a long-distance data transmission linked together by gateway. This paper presents the hardware architecture and the software implementation process. The experimental results show that this system has advantages of high reliability and low cost, so it can be applied to environmental monitoring and the smart home system
Research on Effect of Paper Containing OBA on Color Reproduction
Authors: Bai Wei Guo , Ma Xiao Si , Jing Yi
Published: February 2012

Adding Optical Brightening Agent (OBA) during papermaking has been widely used in modern papermaking industry in order to improve paper whiteness. Because of ISO standard data is based on the paper without OBA, it makes a great diversity of result in color reproduction, and causes the printing production not to meet international standards. This research contrasted ISO whiteness and chroma value of paper with different amount of OBA, analyzed spectral data and tone in color reproduction of paper with different amount of OBA, then got the law of the effect of the ratio of OBA on ISO whiteness and chroma value, and the effect on color reproduction tone level in printing process. It can provide the reference for adding OBA during papermaking.
Multiband Techniques of LED and UV Materials on Visualization of Needle Marks
Authors: Wang Li Jun , Tao Dai Qin , Yin Zhi Yong , Zhao Hui
Published: February 2012

Critical optical techniques on visualization and extraction about needle marks have been developed based on the material properties of the speedometer. It has developed the multi-band waves and special image processing to do multi-spectral analysis on the suspected needle marks locations. The in-depth discussion has been taken especially for UV fluorescence traces, and alternatives have been established for multi-spectral laser with the multi-wavelength LED light source. Issues have been solved such as size and power consumption to meet the needs of image acquisition and processing. It should choose the right light waves based on the optical properties for various materials of the needle and the gauge plate.
The Analysis of Wave Form for 3-D Wave Tank
Authors: Wang Yun , Li Bing Nan , Xu Zhen Ying , Zhang Yong Kang
Published: February 2012

The 3-D numerical model of wave tank is developed considering the effects of wave generating and absorbing based on viscous fluid motion differential equations (N-S equation) and the volume of fluid (VOF) method by the use of FLUENT solver. The simulation is also made by the analysis of the existing methods of wave simulation. The wave form of the 3-D wave tank is analyzed with the result of diverse diversification at different wave location and their relationship. The flow path of each particle of the wave during the propagation is also been analyzed, which provides guidance for the wave form analysis.
Gearbox with Worm Face Gear Coated with Nanostructured Multilayer
Authors: Bolos Vasile , Biro Dominic , Strnad Gabriela , Bolos Codruta
Published: February 2012

The paper presents a piece of research carried out at Petru Maior University regarding the realization of a gearbox equipped with a worm face gear on which the sides of the teeth, after heat treatment, were covered with nanostructured multilayers to improve the working conditions in what regards the friction.
Microwave Sintering of Barium Ferrite Nanoparticles Processed via Sol-Gel Method
Authors: Waluyo Nurhadi S. , Almajid Abdulhakim A. , Soliman Mahmoud A.
Published: February 2012

Consolidated barium ferrite nanoparticles were expected to obtain better magnetic properties. Sol-gel method was used to produce the barium ferrite nanoparticles. Various calcination temperatures were set to obtain the single phase structure. XRD pattern and SEM image confirmed the nanoparticles with 48.66 nm and 70 nm, respectively. Compacted samples were sintered using microwave sintering and conventional furnace with various temperature and time. Magnetic measurement test shows that microwave sintered samples have better properties. The highest magnetic properties values for microwave sintered sample is obtained at 950°C for 60 minutes with coercivity (Hc) of 5565 Oersted, remanence (Br) of 1537 Gauss and saturation magnetization (Ms) of 37.04 emu/g.
Synthesis of Anatase-Based Titania Nanostructures Using Extreme Hydrothermal Conditions
Authors: Loryuenyong Vorrada , Sooksaen Pat , Sanitchai Phiphatphong
Published: February 2012

TiO2 nanostructures with a pure anatase phase were successfully synthesized using hydrothermal treatment of P25-TiO2 nanoparticles. These nanostructures were characterized using transmission electron microscopy (TEM) and x-ray powder diffraction measurements. The dependences of reaction temperature and calcination temperature on titanate-anatase phase transformation and the morphology of TiO2 nanostructures were also discussed. The results demonstrated that phase composition and particle morphology can be controlled by both the reaction and calcination temperatures.