bluuebunny/crossref_metadata_2025 huggingface dataset:
Adopting Mobile Learning in Tertiary Environments: Instructional, Curricular and Organizational Matters
Authors: Handal Boris , MacNish Jean , Petocz Peter
Published: September 2013

This qualitative study looked at the instructional, curricular and organizational factors impacting on the adoption of mobile learning in a higher education institution. Academics expressed their views on a variety of educational issues likely to enhance or hinder the effectiveness of the innovation. Teachers requested more professional development in a number of key areas including the integration of the technology into teaching and learning. Likewise, resolving vital issues such as workload, equity to access and effective policy making were seen as key to successful adoption. Technical issues such as having good wireless connectivity, need for efficient technical support, access to mobile devices and an understanding of their operational limitations with respect to desk/laptops were also highlighted. The study revealed a number of alternative perceptions and misconceptions, about articulating effective mobile learning pedagogies. For instance, staff expressed concerns about the risk of exposing students to superficial learning when mobile learning experiences were not well designed, the prospect that the devices might distract students from learning, as well as a possible deterioration of the quality of interaction between academics and students. Recommendations to reconcile those alternative conceptions with best practice principles are outlined.
Faces of a Changing Climate: Semi-Quantitative Multi-Mycotoxin Analysis of Grain Grown in Exceptional Climatic Conditions in Norway
Authors: Uhlig Silvio , Eriksen Gunnar , Hofgaard Ingerd , Krska Rudolf , Beltrán Eduardo , Sulyok Michael
Published: September 2013

Recent climatological research predicts a significantly wetter climate in Southern Norway as a result of global warming. Thus, the country has already experienced unusually wet summer seasons in the last three years (2010–2012). The aim of this pilot study was to apply an existing multi-analyte LC-MS/MS method for the semi-quantitative determination of 320 fungal and bacterial metabolites in Norwegian cereal grain samples from the 2011 growing season. Such knowledge could provide important information for future survey and research programmes in Norway. The method includes all regulated and well-known mycotoxins such as aflatoxins, trichothecenes, ochratoxin A, fumonisins and zearalenone. In addition, a wide range of less studied compounds are included in the method, e.g., Alternaria toxins, ergot alkaloids and other metabolites produced by fungal species within Fusarium, Penicillium and Aspergillus. Altogether, 46 metabolites, all of fungal origin, were detected in the 76 barley, oats and wheat samples. The analyses confirmed the high prevalence and relatively high concentrations of type-A and -B trichothecenes (e.g., deoxynivalenol up to 7230 µg/kg, HT-2 toxin up to 333 µg/kg). Zearalenone was also among the major mycotoxins detected (maximum concentration 1670 µg/kg). Notably, several other Fusarium metabolites such as culmorin, 2-amino-14,16-dimethyloctadecan-3-ol and avenacein Y were co-occurring. Furthermore, the most prevalent Alternaria toxin was alternariol with a maximum concentration of 449 µg/kg. A number of Penicillium and Aspergillus metabolites were also detected in the samples, e.g., sterigmatocystin in concentrations up to 20 µg/kg.
Les aides publiques à la garde des jeunes enfants [Une analyse à partir du modèle de microsimulation MYRIADE]
Authors: Legendre François , Lorgnet Jean-Paul , Mahieu Ronan , Thibault Florence
Published: September 2013

State support for childcare. An analysis using the MYRIADE microsimulation model.

The parents of children born after 1 January 2004 are eligible for the Young Child Benefit (Prestation d''Accueil du Jeune Enfant-PAJE), a new benefit intended as a subsidy for parents who use childcare facilities or as financial support for those who reduce their paid employment to look after their children themselves. The MYRIADE microsimulation model of the national family allowance fund (CNAF) has been modified to facilitate evaluation of the budgetary and redistributional effects of the new benefit. By improving the description of the pre-reform situation as regards types of childcare, the aim was to simulate more accurately the potential effects of changes to the rules in this area. In addition to the PAJE, the article examines two alternative reforms of the benefits existing in 2003. Their analysis provides comparative elements that are used to assess the choices made for the new benefit.
Les projets d’implication paternelle à l’épreuve de la première année
Authors: de Ridder Guido , Céroux Benoît , Bigot Sylvie
Published: September 2013

Projects for fathering : the test of the first year.

The birth of a child to a couple is not neutral. But while this arrival itself is quite well understood, having been studied extensively for the mother, the reactions of the father remain poorly understood. This article seeks to define and analyse the involvement of fathers in the arrival of a child. Drawing on a series of interviews conducted before the birth of the child and in its early months, the authors show how the fathers react and construct their paternal identity on different levels : personal-what notion of fatherhood do they develop ? Familial-how, for example, do they construct their status of father in relation to the mother ? and social-the impact of the birth on their working lives.
Le soutien apporté aux jeunes adultes dans les familles recomposées
Authors: Cadolle Sylvie
Published: September 2013

Young adults today require lengthy economic and emotional support before taking their place in adult life. The family network of the child of separated parents is split into two parts – the mother''s side and the father''s side – and can be further enlarged by the formation of a blended family. In continuity with a childhood usually spent with the mother, the mother''s side provides most support to the young adult. The step-father willingly makes a financial contribution, considering it natural to support his wife''s children. On the other hand, when a father has re-partnered, his support often decreases or stops as a result of the step-mother''s reluctance to devote a share of the household''s income to providing help for her partner''s children. The generosity of the paternal grandmother offsets this imbalance to a limited extent. But this persistence of gender roles hinders the achievement of equitable co-parenting.
Integration of Physical Devices into Game-based Virtual Reality
Authors: Zhang Zhou , Zhang Mingshao , Tumkor Serdar , Chang Yizhe , Esche Sven , Chassapis Constantin
Published: September 2013

Virtual reality (VR) systems have the potential for alleviating the existing constraints on various natural and social resources. Currently, real-time applications of VR systems are hampered by the tediousness of creating virtual environments. Furthermore, todayâ??s VR systems only stimulate the human senses of vision, hearing and â?? to some extent touch â?? which prevents the system users to feel fully immersed in the virtual environment. By integrating real physical devices with virtual environments, the user interactions with such systems can be improved and advanced technologies such as the MS Kinect system could be used to augment the environments themselves. While existing development platforms for VR systems are expensive, game engines provide a more efficient method for integrating VR with physical devices.

In this paper, an efficient approach for integrating virtual environments and physical devices is presented. This approach employs modifications of games that are based on commercially available game engines for implementing the virtual environments in conjunction with the application of Dynamic Link Libraries (DLLs) for realizing versatile communications between these virtual environments and various application platforms, which in turn can interact with the physical devices outside of the virtual environments. This paper is divided into four sections. In the first section, the motivation for the developments described here is discussed, followed by a description of the method used to integrate virtual environments with physical devices in the second section. In the third section, an interactive and collaborative laboratory environment based on a multi-player computer game engine that is linked to physical experimental setups is presented as an example of a VR system. In the final section, some additional promising applications of the developed platform and the corresponding challenges are briefly introduced.
Piezoresistive Ring-Shaped AFM Sensors with Pico-Newton Force Resolution
Authors: Xiong Zhuang , Walter Benjamin , Mairiaux Estelle , Faucher Marc , Buchaillot Lionel , Legrand Bernard
Published: September 2013

A new concept of Atomic Force Microscope (AFM) oscillating probes using electrostatic excitation and piezoresistive detection is presented. The probe is characterized by electrical methods in a vacuum chamber and by mechanical methods in air. The frequency-mixing measurement technique is developed to reduce the parasitic signal level. These probes resonant in the 1MHz range and the quality factor is measured about 53000 in vacuum and 3000 in air. The ring probe is mounted onto a commercial AFM set-up and the surface topography of PMMA sample (2 µm square) is obtained. The force resolution deduced from the measurements is about 10 pN/Hz0.5.
Malware Detection and Prevention System Based on Multi-Stage Rules
Authors: Alazab Ammar , Hobbs Michael , Abawajy Jemal , Khraisat Ansam
Published: September 2013

The continuously rising Internet attacks pose severe challenges to develop an effective Intrusion Detection System (IDS) to detect known and unknown malicious attack. In order to address the problem of detecting known, unknown attacks and identify an attack grouped, the authors provide a new multi stage rules for detecting anomalies in multi-stage rules. The authors used the RIPPER for rule generation, which is capable to create rule sets more quickly and can determine the attack types with smaller numbers of rules. These rules would be efficient to apply for Signature Intrusion Detection System (SIDS) and Anomaly Intrusion Detection System (AIDS).
Defects and Electrical Properties of Crystalline Silicon at Different Metallurgical Route
Authors: Lai Hui Xian , Huang Liu Qing , Fang Ming , Lu Cheng Hao , Chen Juan , Yu De Qin , Li Jin Tang , Ma Wen Hui , Shen Jian Ning , Sheng Zhi Lin , Luo Xue Tao
Published: September 2013

To investigate the effects of the metallurgical route on the defects in mc-Si, various metallurgical routes were conducted. Dislocation formation and the resistivity of the mc-Si were also studied. The results showed that high inhomogeneity in dislocation distribution within individual grains and paralleled tacking faults could be observed when the ingot was grown by using the feedstock prepared by adopting the sequence of slag treatment, acid leaching and vacuum refining. Different grains have various dislocation density, which was showed in ingot grown by utilizing the feedstock prepared by adopting the sequence of vacuum refining, slag treatment and acid leaching, tacking faults could also be seen, as well as some dislocation clusters. The resistivity of this two ingots was detected at various height by using the a 4-point probe silicon tester, it was expected that the resistivity of these two ingots has the same tendency of the change, and the value of the resistivity of the ingot obtained using the previous technology was relatively higher than that of the ingot obtained using the latter technology.
Some Features of Radio-Spectral Diagnostics of Random Media via PM and PRM Oscillations
Authors: Gomidze Nugzar , Khajishvili Miranda , Makharadze Kakha , Jabnidze Izolda
Published: September 2013

Due to the development of satellite, mobile, cellular, and optical telecommunication systems, a special attention is paid to broad band frequency signals, like signals with wide spectrum, when frequency band of the transmitting signal may be wider than frequency band of the transmitted signal itself. For many telecommunication systems, the ability of transmitting information to several users simultaneously via one and the same channel is very important. A number of methods are applied for this purpose, for instance: the frequency modulation (FM) of the carrier signal (the method of frequency division of transmitting channel), phase modulation (PM) of the carrier signal or pseudo-random modulation (PRM) of the carrier signal. In the conditions of increasing demands on communication systems, the question of creating multi-user systems became very actual. In all cases it is necessary to provide high quality connection on longer distance so that the universal standards should not be violated.
Research on Temperature Control System of Fruit and Vegetable Processing Line Based on Fuzzy Immune PID
Authors: He Yong Ling , Liu Yuan , Wei Xiang Gui , Zhang Qian Feng , Li Jie Ping , Zhang Xiao Pei
Published: September 2013

Temperature control has direct effect on mouth feel of fruit and vegetable processing products. This paper, by analyzing the control requirements of cucumber slices processing water temperature, proposes to control the water temperature for cucumber slice processing production line by using fuzzy immune PID. With the features of time-varying, nonlinear and hysteretic nature for temperature control, this paper designs fuzzy immune PID controller by borrowing the regulating action of immune system and linking the advantages of immune PID controller.
Crack Identification in Vibrating Beams Using Haar Wavelets and Neural Networks
Authors: Feklistova Ljubov , Hein Helle
Published: September 2013

This study investigates the depth and location of cracks in homogeneous Euler-Bernoulli beams with free vibrations. The problem is frequently encountered in industrial design and modeling, where an exact model requires the frequency output to be calibrated with a physical measure. The crack is simulated by a line spring model. The boundary value problem is solved using the Haar wavelets. The characteristic parameters are predicted with the aid of neural networks. The proposed method is compared to an alternative approach based on neural networks and several frequencies only. The significance of the complex approach of Haar wavelets and neural networks lies in its ability to make fast accurate model-independent predictions calculating only one natural frequency and training the network only once.
Deterioration of Cement Pastes Containing Limestone Powder with Different Fineness Exposed to Sulfate Environment at Low Temperature
Authors: Zhang Feng Chen , Tang Ruo Yu , Zhao Yun
Published: September 2013

Limestone filler and aggregates are used widely in cement production and concrete mixing nowadays, which could be connected with thaumasite formation, and lead to a lack of durability further in sulfate environment. This work deals with the deterioration of cement pastes containing 35% w/w limestone powder with different fineness immersed in MgSO4 solution at 5°C±2°C for 15 weeks by. Erosion phases are discussed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). Test results show that visual deterioration of three kinds of cement pastes containing 400-mesh, 800-mesh and 1250-mesh limestone powders has little distinction, and erosion phases are all compound of ettringite, thaumasite, gypsum and brucite. Limestone powders with fineness of 400-mesh could supply enough carbonate needed for thaumastie formation. Increase of limestone fineness further could not accelerate deterioration of cement paste during the external magnesium sulfate attack at low temperature.
Study on Green Construction Evaluation Based on the Fuzzy Matter-Element
Authors: Shao Bi Lin , Yang Min Min , Liu Bo Qiang
Published: September 2013

Green construction plays an important role in the formation of green building. For the characteristics of fuzziness and incompatibility, this paper introduces the theory of fuzzy matter-element into the evaluation of green construction. The power weight is worked out with the entropy method, the related degree values between the standard fuzzy matter-element and each fuzzy matter-element is established, it lines up each scheme to pick up the best scheme. The result shows that among the methods of multiple indexes comprehensive evaluation of green construction, this method can reflect the extent of green construction objectively and accurately.
Study on the Scope of Application of Cement Deep Mixing Pile to Consolidate Soft Soils
Authors: Guo Xin Hong , Wu Guang De , Guo Xin Huan
Published: September 2013

According to the experiments study, the formulas of strength with the changes of moisture content, natural dry density, cement dosage are presented. Applicable range of cement mixing pile to consolidate soft soils is determined which can be used to guide the using of cement mixing pile and provide reference for design or research departments at the same time.
Analysis of the Plastic Extension of Parking Cracks on Casing after Testing
Authors: Huang Long Cang , Tong Shao Kai , Cao Yin Ping , Dou Yi Hua
Published: September 2013

To avoid the fatigue fracture of casing inside slips, the plastic extension of casing cracks near slips under inner pressure after taking RTTS packer out should be analyzed. The plastic zone size of instability extension of two/three-dimensional cracks on casing was derived based on the theory of fracture mechanics. Analysis results show that hoop stress caused by inner pressure of casing is a key factor to lead to the instability extension of casing radial cracks after testing. The plastic extension zone size of cracks on casing near slips increases with the inner pressure or hoop stress. And, the plastic extension of cracks on casing near slips reduces the burst strength of casing significantly. The materials of casing materials and the inner pressure should be appropriately controlled to control the propagation of cracks.
Study on Damage Characteristics of Reinforced Concrete Structure for Internal Explosion
Authors: Yang Ya Dong , Li Xiang Dong , Wang Xiao Ming
Published: September 2013

In order to reveal the damage characteristics of internal explosion, the internal explosion of closed RC structure under incremental charges manner until structural damage are simulated by LS-DYNA code. The weight changes of charge influence on structure damage and distribution law of characteristic parameter of shockwave on the typical position are also discussed in this paper. The results show that, the distribution of shockwave overpressure on the walls under different weight of charge obey three kinds of linear laws as following: affected by one wall, two walls and three walls, respectively. The distributions of impulse on the walls under different weight of charge obey their distribution curve respectively when the structure is undestroyed, but the impulse will deviate from the distribution curve when the structure is destroyed. And the damage situation of RC structure under internal explosion is graded。
Applicability of Modified TOPMODEL in the Arid Zone and the Humid Zone
Authors: Liu Shuang , Xu Jing Wen , Zhao Jun Fang , Hou Peng
Published: September 2013

This study aims at discussing the applicability of modified TOPMODEL in different areas with various climate conditions in China, choosing the Youshuijie catchment (the humid zone) and the Yingluoxia catchment (the arid zone) . Hydro-meteorological data and 90-m-resolution DEMs are used for driving the models. From the Nash-Sutcliffe efficiency coefficient (NE), we can see that TOPMODEL performed much better in the Youshujie catchment than in the Yingluoxia catchment, which suggests that modified TOPMODEL is much more suitable in the humid zone.
Exact Solution of Stress and Radial Displacement of Elastic Tapered Interference Fit
Authors: Xiong Ling , Shang Peng , Xu You Lin
Published: September 2013

Tapered interference fits, which can transfer large torques, are widely used in the connection design for propeller hubs and shafts of large vessels. In this paper, a model was developed to study the influences of torques, rotational speeds and tapers on the tapered interference fit between a propeller hub and a shaft. Using the classic elastic plane stress theory, the exact solutions of the radial stresses, tangential stresses and radial displacements of the propeller hub and shaft are derived. Then the calculation method of the magnitude of the tapered interference fit was presented. Finally taking a screw propeller system as an example, the above solutions were calculated using the numerical method. The results show that improving the stress distribution of the propeller hub is an effective approach to increase the connection strength and torque transmission capacity. If the rotation speed has to be considered, the stress and displacement would be increased significantly due to the centrifugal force. The present analytical solutions are expected to be useful in the structure design of tapered interference fits for propeller hubs and shafts.
Dual Variables System Analysis for Timoshenko Beam
Authors: Guo Shi Wei
Published: September 2013

Regarding the displacements and internal forces of Timoshenko beams as dual variables, Timoshenko beam problems were included into dual variables system. Corresponding to state transfer solution of Hamiltonian dual equation, transfer form solution of dual variables for Timoshenko beams was presented. Based on transfer form solution, element stiffness equation and the shape functions of Timoshenko beams were deduced, boundary integral equation and the fundamental solution function of Timoshenko beams were obtained, which reveal the intrinsic relationships among the finite element method, the boundary element method and dual variables system of Timoshenko beams. Based on the transfer form solution of Timoshenko beams, transfer matrix method for chain structure of Timoshenko beams was proposed. For chain beam structure problems, transfer matrix method is simple, intuitive, and has the advantages of good boundary adaptability and less calculation in solving the node variables of chain structures with recursive solution. The numerical results demonstrate the feasibility and accuracy of transfer matrix method in complex beam structure problems.
Dynamic Performance Analysis of Steel Truss Bridge
Authors: Wang Shan Shan , Xu Tao , Qin Si Feng , Zhang Yun Jie
Published: September 2013

Steel truss bridge is an important part of transportation hub and lifeline engineering, it recently has attracted more attention on dynamic performance of steel truss bridge. In this paper, the ANSYS software is used to perform the modal analysis of steel truss bridge, and we find that the main bridge are more sensitive to the vertical earthquake (i.e., Y direction). In the earthquake response spectrum analysis on Y direction, we find that the maximum deformation is at mid-span of steel truss bridge. In the transient analysis of seismic waves, under the action of horizontal and vertical earthquake accelerations, the structure displacement dynamic diagram and time-history displacement curve are obtained and some conclusions are drawn.
Synthesis of Bismuth Nanoparticles by a Simple One-Step Solvothermal Reduction Route
Authors: Zhang Mao Lin , Feng Chen , Zhang Wen Xing , Luan Xiao Wen , Jiang Jian , Li Long Feng
Published: September 2013

The bismuth nanoparticles are synthesized via a solvothermal reduction method based on the chemical reduction of Bi3+ by ethylene glycol acting as the solvent and the reducing agent. The structural and morphological properties of the bismuth nanoparticles are investigated by X-ray diffraction and scanning electron microscope. The results demonstrate that the synthesized powders has a rhombohedral crystalline structure and their diameters are in the range of 75-103 nm under the condition of the different initial bismuth nitrate concentrations with the reduction temperature of 200°C, indicating that the thermal reduction temperature and the initial bismuth nitrate concentrations are key factors for phase composition as well as crystal size.
Analysis of Damping Force Changing with Temperature for Self-Feedback-Friction Damper
Authors: Liu Hai Yang , Zhao Dong , Sun Lian Jiang , Zhang Meng
Published: September 2013

The self-feedback-friction damper can adjust damping force according to the intensity of vibration. Damper will produce suitable damping force to achieve the purpose of damping energy consumption. At the same time, the damper may also produce a large amount of heat which can greatly affect the damper's energy consumption performance. A temperature compensation system is designed to solve the problem in the article. Structure temperature field is also worked out by finite element analysis to find out the effect of temperature on the damping force.
Experimental Study on the Performance of the Laminated Steel Isolators
Authors: Xie Yao Guo , He Ping , Qu Xian Qiang , Cui Hong Bin
Published: September 2013

Through the analysis and comparison of the results of static and dynamic performance testing of a series of laminated steel pieces isolators used in the vibration isolation of warships, in the number and thickness of laminated steel pieces of the same circumstances, laminated steel arc and preload of test samples had a certain impact on the values ​​of static stiffness, dynamic stiffness, damping ratio as well as dynamic and static stiffness ratio.
Boundary Element Method for Crack Analysis in Two-Dimension Anisotropic Solid
Authors: Liu Chong Xi
Published: September 2013

The derivation and calculation of crack problems by using boundary element method (BEM) are presented. When calculating the node displacement, the displacement boundary integral equations are superseded by stress boundary integral equation, then a simplifier computational process is generated. Stress field and displacement field around the straight crack are calculated by using both BEM and Abaqus methods. Furthermore, the stress intensity factor (SIF) was achieved from the solution. A good agreement is found between the BEM and Abaqus results, proved that BEM is a reliable method to calculate crack problems.
Numerical Simulation of Cross-Flow around Four Square Cylinders in a Square Configuration at Low Reynolds Number
Authors: Zhang Wei , Li Wen Jie , Ye Hui Hua , Zhang Dian Xin
Published: September 2013

A two-dimensional finite volume method with unstructured mesh is used to simulate the flow around four square cylinders in a square configuration at low Reynolds numbers.The vorticity field, drag and lift coefficients, and Strouhal number are resolved at different spacing ratios. The vortex-shedding process and fluid-structure interactions of four square cylinders are analyzed at Reynold number of 100. The results show that the spacing ratio has important effect on the drag and lift coefficients. The accuracy of the numerical scheme are validated against other numerical and experimental data.
Calculation of Regular Longitudinal Wave Force in MMG Model Based on CFD
Authors: Yang Lin Jia , Tao Yi Han
Published: September 2013

Wave force is one of the most important environmental disturbing forces in ship motion mathematical model. Calculating the wave force in ship mathematical model is of a great importance about prediction of ships maneuverability. In order to calculate the longitudinal wave force in MMG ship motion mathematical model, the CFD method was used in this work to build numerical wave flume. The 3D model of M/V YUKUN and hexahedral mesh of the domain of the flow field were made. Software Fluent was used to simulate the motion of YUKUN in regular longitudinal waves, and the wave force acting on YUKUN was obtained. Finally, regression formula was built based on the simulation results.
Structural Synthesis of Spatial 4-Link Mechanisms for Coil Winding
Authors: Hsieh Wen Hsiang , Tseng Chih Yang
Published: September 2013

The purpose of this paper aims at performing the structural synthesis for coil winders of the spatial 4-link type, therefore the atlas of new designs can be obtained. First, the design requirements and design constraints are specified based on the kinematics characteristic of coil winders. Then, the (4, 4) kinematic chains are obtained by number synthesis, and the atlas of feasible chains is generated. After that, the atlas of specialized feasible chains is found. Finally, all new designs are obtained through the particularization process, and two new design are found in this study.
Manufacturability Analysis of Integrated Product Based on Feature Mapping
Authors: Tian Jian Ping , Huang Dan Ping , Zhang Liang Dong , Yang Hai Li , Huang Yu Chun
Published: September 2013

For the lack of effective product representation method, traditional CAD system cannot support integration of product design and manufacture effectively. This integration is the key to achieving Three-dimensional process design. Using the model definition of manufacturing feature, the part information of processing & manufacturing could be expressed completely. This representation method was put forward using the manufacturing feature of "cutting characteristics". A dynamic model of the manufacturing feature was established. Through study on mapping rules between features, the shape features mapping to the manufacturing features were realized. An effective solving way was provided for the expression of CAPP product model.
Computer Simulation of Filling Process and Temperature Distribution of Oil Pump Cover in Solidification Process
Authors: Liu Han Wu , Huang Lian Dong , Fan Shun Qin , Hu Bo
Published: September 2013

Oil pump cover, as a part of the oil pump, is generally formed by adopting aluminum die casting molding, and required for good internal and external quality. In order to improve the oil pump cover forming quality, the paper first simulates the thermal equilibrium of die-casting mold in the forming process by finite element analysis, and obtains the temperature curves when mold works for 10 consecutive cycles, and determines that the thermal equilibrium temperature of die-casting mold is 260 °C. And then, based on the simulation results of filling and solidification in the forming process by ProCAST software, the shrinkage and cavity appear in the larger wall thickness of the casting. Meanwhile, by simulating the die-casting processes of the oil pump at different pouring temperatures, there are the least of shrinkage and cavity when the pouring temperature setting 640 °C. The results show that: it can take some methods to achieve the progressive solidification, and can reduce or eliminate the possible shrinkage and cavity, such as shortening the distance between sprue, runner and inner runner and die casting to reduce the casting heat loss, or adding cooling system to accelerate the cooling rate in the larger wall thickness of the casting. This analysis provides theoretical basis for the actual casting production of oil pump covers.
Study on the Z-Source Inverter with Low Voltage Stress
Authors: Zhong Li Ping , Gu Qi Min , Zhang Shui Ping
Published: September 2013

This paper proposed a kind of low voltage stress Z-source inverter topology. In the topology, the inductors of Z-source can be connected alternatively in parallel during the time of shoot-through and in series during the other time. Thus the network can obtain a high boost factor with a small shoot-through duty ratio and can decrease the voltage stress across the switch divices greatly. The principle of the topology was analyzed in detail and the simulation experiments was made as well. Simulation results verified the validity of the topology.
Simulation and Analysis the Internal Flow Field of Control Valve Bonnet Leakage
Authors: An Yan Tao , Ma Ru Jian , Wang Yong
Published: September 2013

Apply the CFD numerical simulation the internal flow field and noise when the control valve is bonnet leakage and trouble-free. Research shows that bonnet leaking has almost no effect on valve inlet and outlet flow field. It is an impact on valve body flow field and the greatest impact on balance cavity. It changes the flow direction of the balance cavity and produces right vortex, in balance cavity where originally without noise, the tremendous noise appeares and improves the noise of the surrounding area.
Evaluation of Sphericity Error Using Differential Evolution Method
Authors: Chen Yue Ping , Jin Long , Li Shu Ping , Song Shi Liu , Liang Yan
Published: September 2013

The mathematical model of sphericity error under the condition of minimum zone is derived. An algorithm based on the differential evolution (DE) is proposed to evaluate the sphericity error. Its principle and realization approach are discussed to solve the minimum zone sphericity error. The proposed method was verified by an example. Compared with other methods, the results show that the proposed method makes the sphericity error evaluation more accurate.
A Modified Genetic Algorithm for Total Processing Time Minimization in the Manufacturing Process Planning Problem
Authors: Shi Can Tao , Liu Qi You , Liu Yu Zhuo
Published: September 2013

For optimization of manufacturing process planning problem in flexible manufacture system, a mathematical model is established with objective of minimizing total processing time. The genetic algorithm is applied to solve it with modifications: a segmented chromosome coding is adopted to represent the entire solution space; crossover operator and mutation operator are re-defined to make genetic algorithm suitable for the problem; a constraint adjustment algorithm is designed for the constrained operation sequencing optimization problem. The experimental result indicates that the proposed model and algorithm are feasible and effective.
An Evolutionary Game Model of the Establishment of Tracebility System in Food Supply Chain
Authors: Tang Sai
Published: September 2013

For a two-echelon supply chain system which consists of upstream node enterprises and downstream node enterprises, cooperation mechanism between bounded rational upstream and downstream nodes through collaborative establishment and implementation of food traceability system was modeled based on evolutionary game theory. The study shows that the probability of cooperation between both sides has a a negative correlation with the total cost of establishment and positive correlations with the probability of risk occurrence, the total excess income and reduction in risk loss from cooperation of both sides, and the excess income from the establishment of one side. Cost shared by both sides should be positively related to the excess income they obtaine. And there are an optimal coefficient of total excess income allocation and an optimal coefficient of reduction in risk loss allocation to maximize the probability of cooperation.
Water Modeling Study on Removal of Inclusions in RH Degasser
Authors: Yang Chun Jie , Tang Fu Ping , He Tao
Published: September 2013

A physical model was established according to the similarity theory to simulate the real 175t RH-TB vacuum refining device. Liquid steel is simulated by Nacl solution, the air is approximate argon and polypropylene simulate inclusions. The influence regularity of treatment time ,lift gas flow rate and submersion depth of snorkels on the inclusions removal rate have been discussed, the optimal values for each influence factor have been found and can be used in optimizing the refining technology.
A New Electrochemical Host-Guest Recognition Sensor for DNA Detection
Authors: Cheng Lin , Lin Yan , Feng Cui Han , Fan Hao
Published: September 2013

This communication reports on a new electrochemical method to detect the hybridization specificity in homogenous solution by using host-guest recognition technique. A hairpin DNA with a dabcyl molecule which is typical guest molecule to b-CD at the 3’-terminus and a NH2 linked at the 5’-terminus as the probe DNA. The probe DNA was immobilized on the PdS nanoparticle to construct a double-labeled probe (DLP) and could selectively hybridize with its target DNA in homogenous solution. A b-CD modified Poly(N-acetylaniline) glassy carbon electrode was used for capturing dabcyl in DLP. Without binding with target DNA, the DLP keep stem-loop structure and block dabcyl enter into the cavity of b-CD on electrode. However, a target-binding DLP is incorporated into double stranded DNA, causing loop-stem structure opened and dabcyl could be easy captured by b-CD which brought DLP on electrode surface. With electrochemical measurement, the signal come from Pd2+ be used for target DNA quantitative analysis.
Aeroengine Exhaust Gas Temperature Prediction Using Process Neural Network with Time-Varying Threshold Functions
Authors: Ding Gang , Wang Xiong Wei , Lei Da
Published: September 2013

To predict the aeroengine exhaust gas temperature (EGT) more precisely, a process neuron with time-varying threshold function is proposed in this paper, and then the time-varying threshold process neural network model comprised of the presented process neurons is used for EGT prediction. By introducing a group of appropriate orthogonal basis functions, the input functions, the weight functions and the threshold functions of the time-varying threshold process neural network can be expanded as linear combinations of the given orthogonal basis functions, thus to eliminate the integration operation, then to simplify the time aggregation operation. The corresponding learning algorithm is also presented, and the effectiveness of the time-varying threshold process neural network model is evaluated through the prediction of EGT series from practical aeroengine condition monitoring.
Study on the Intelligent Software Testing Systems for Axles
Authors: Ma Zhi Hong , Cai Shan Le , Luo Fu Fang
Published: September 2013

The intelligent software testing system for axles based on Visual C++ is introduced. The method is simple, efficient and economical and can meet the needs for axle intelligent testing at present. The testing procedure of this system is described. The software structure and its function are given.
Study on Sulfur Compounds in the Gasoline
Authors: Liu Shu Jun , Xu Hao Nan , Feng Kun , Wang Ying
Published: September 2013

A procedure to quantify volatile, organic sulfur compounds in gasoline was developed using solid-phase microextraction to preconcentrate the analyses followed by GC and detection with a sulfur chemiluminescence detector (SCD). The effects of temperature, time and PDMS fibers types on the extraction of gasoline has been investigated. The results show that a range of sulfur compounds were identified in gasoline. 75um PDMS, 30min, and 50°C were the optimum extraction conditions. Using the developed method can be used to identify gasoline residues in the fire.
Technology of NC Machine Error Parameter Identification Based on BP Neural Network
Authors: Li Yao Ming , Shen Xing Quan
Published: September 2013

NC machines touch-trigger probes generally have three-dimensional measuring function, its working principle is equivalent to a duplication of contacts with high precision switch, under the control of the measurement software, to achieve high-precision machining center automatically detected. Paper proposed based on BP neural network in NC machines tool probe measurement error parameter identification method. Through theoretical analysis and experimental research to determine the probe installation error parameters and the probe measurement error parameters of the model, but also identify ways to eliminate probe system error term uncertainty of the condition, in order to determine the detection method and planning of testing provides a reliable path basis.
Research of Snow-Degraded Image Clearness Methods
Authors: Song Kai , Yang Dong , Nie Xin
Published: September 2013

An improvement of coterminous frames differencing is proposed. By using the improved algorithm, the snow point from video image obtained in the snow day can be removed significantly. The snow regions are extracted by the temporal difference of pixels from the five adjacent frames in video images, The absolute value of differential luminance of each frame is then obtained. The luminous intensity of the background and effects by snow can be further computed. Finally, the intensity of the contaminated pixels is replaced by the average value of future and past frames. The results of the experiment show that this algorithm can improve the quality of video images in light snow, heavy snow even heavy snowstorm strongly.
Ultrasonic Testing Signal De-Noising Processing Based on Orthogonal Matching Pursuit Algorithm
Authors: Yu Yong Fang , Yi Fei , Cheng Huan Xin , Cheng Li
Published: September 2013

Ultrasonic NDT signal de-noising effect is the key indicators to determine whether the pipe is defective.Orthogonal matching pursuit algorithm optimization process, the sampling signal and reconstructed signal by the method of least squares.Using Orthogonal Matching Pursuit Algorithm for the sampling signal to optimize and reconstruct. It is successfully to verify the OMP algorithm can recover the signal based on the MATLAB platform.Designed a signal de-noising processing module to help staff to determine pipeline defects conveniently,it achieved de-noising successfully.
Research on De-Noising Technology in Ultrasonic on-Line Detecting System
Authors: Cheng Huan Xin , Cheng Zhen Huan , Liu Wei , Cheng Li
Published: September 2013

Noise, an important factor which impact on the performance of ultrasonic online testing system, has a direct influence on the signal-to-noise ratios level of ultrasonic signal acquisition. Noise problem of grain ultrasonic online testing system has been studied in this paper from two aspects, theoretical analysis and engineering practices. In this case, we can solve the noise interference problem in ultrasonic online testing system, and improve the performance of system and signal-to-noise ratio of signal acquisition.
Vision Measurement for the Pose of Cannon Barrel
Authors: Su Jian Dong , Duan Xiu Sheng , Xiao Jing
Published: September 2013

The pose measurement of cannon barrel (vertical angle and azimuth angle) is a difficulty and emphasis in the precision analysis of SPAAG fire control system. To solve this problem, this paper presents a contactless measuring method based on computer vision. Before measurement, fix a checked planar faceplate on the cannon barrel as a marker. Firstly, get the coordinate of X corner points using Harris Corner Detection Algorithm to calibrate the camera, and chalk up the cameras intrinsic parameters based on Extended Kalman Filter. Secondly, get the corner points from the image of test position, then calculate the extrinsic parameter matrix of the corresponding position combining with LSE algorithm. Finally, according to the motion model of cannon barrel and the position relative to the marker, derive the constraint equations between extrinsic parameter and vertical angle and azimuth angle, then figure out the two angles. Experiment validate the maneuverability and veracity of this method, and the results indicate that the measuring precision of this method is less than 1mil.
Extraction of Optimal Contour Dominant Points Based on ICT Images in Reverse Engineering
Authors: Liu Guang Shuai , Li Bai Lin
Published: September 2013

How to effectively extract contour dominant points is one of key problems in process of industrial CT image, second extraction method was put forward. Second extraction method included two steps: rough extraction and accurate extraction. Firstly, discrete circular curvatures of contour points are calculated. Secondly, through rough extraction step, bad points and points which arent correlated with contour features were removed. At last, through accurate extraction step, contour dominant points were extracted by levels of detail. Experimental results show that contour dominant points can describe contours shape and redundant data are removed, the proposed method is simple and efficient.
Study on Data Transfer Mode of Port Logistics Operating Machinery Based on Industrial Ethernet
Authors: Wang Yong , Li Ling Li , Wang Lin Shuai
Published: September 2013

To set up a data transmission network is vital for Fangcheng ports modernization.This paper analyses the requirements of Fangcheng ports data transmission of logistics equipments.The realization of industrial ethernet technology in the Fangcheng port intelligent monitoring system is introduced. Then the ideal industrial ethernet network topology of Fangcheng port and the data transmission network of Fangcheng ports logistics equipments are designed.
Design and Simulation of Testing Circuit for Radio Frequency Chip
Authors: Luo Qing , Chen Hui , Li Guo Yuan
Published: September 2013

RF technology is widely used in wireless communication. Due to the small size, high density and high frequency, RF IC testing based on ATE faces many challenges. This paper took a LNA chip fabricated by a GaAs process as an example, simulated the test circuit and studied two methods of RF impedance matching by using the software of Agilent ADS. The results show that it solves the impedance mismatch of the input and output ports in RF test, providing the theoretical support to the design and production of RF test board.
Conflict and Hidden Trouble of Distributing Misplay at Memory Resources
Authors: Yang Hua Shu , Wang Yi , Yang Yu Lu , Peng Xin Long , Wang Xue Peng , Pu Ying Ju
Published: September 2013

Resources of memory are frequently used times without number for reducing cost of control system. Rewriting in memory would cause occasional hardware conflict when especial data are inputted or are calculated, thereby system faults even accidents are elicited. Origin of occasional malfunction was analysed in automatic control system, necessity of program storage separate from data storage was discussed, and the notion was put forward that resource allocation of memory should be compatible with the system function. So dead halt owing to codes cover each other could be avoided, and reliability of measurement or control system could be effectively improved.
Towards a Semantic LaTeX for Managing Scientific Knowledge
Authors: Xu Hao
Published: September 2013

We believe that semantic annotation will undermine the traditional way of reading and knowledge dissemination. In this paper, we introduce the SKOTeX, whose name is derived from LaTeX and BibTeX, respectively an editing tool which enables users to generate semantic enriched documentation, and a file format that specifies sets of annotating commands and storage forms similar to those used in LaTeX and BibTeX. SKO TeX can be applied in such a way as to take charge of the whole lifecycle management of Scientific Knowledge Objects (SKO), which includes the establishment, release, annotation, re-use, and so on.
Research on Control Scheme of Daul-Cyinder Reverse Synchronous Hydraulic System
Authors: Zhao Guo Hua
Published: September 2013

In view of the asymmetric reverse synchronization control problem of two hydraulic cylinders, several kinds of synchronous control scheme are put forward,that are total feedback and synchronization error correction,main/auxiliary control feedback and unilateral correction,respective feedback correction and total feedback and total correction.Through research and analysis, we reach the conclusion to make the system to achieve better dynamic and static performance, total feedback synchronization error correction or main/auxiliary control unilateral correction synchronous control scheme is better solution.
Application Research on Learning Strategy Control of Daul-Cylinder Synchronous Movement
Authors: Zhao Guo Hua , Chen Jian Guo
Published: September 2013

The hydraulic control system of the dual-cylinder synchronous motion is designed, and the basic operating principle of the dual-cylinder synchronous motion system is discussed.The self-learning control algorithm of dual-cylinder synchronous motion is introduce, the synchronous control circuit is discussed .Dynamic simulation of dual-cylinder synchronous motion control system is presented, and factors affecting synchronous performance are analyzed.