bluuebunny/crossref_metadata_2025 huggingface dataset:
Determining Dynamics of the Effort in Physical Education Lesson
Authors: Ungureanu Aurora , Muntean Gabriel , Dochia Mădălina Oana
Published: June 2014

SummaryThe physical education class preparatory grade students have only recreative caracter but it must contribute to increasing the effort capacity of the student The physical education class for preparatory grade students cannot have only a recreative character but it must contribute to increasing the effort capacity of the students’ body which can result into modifocations and adaptations of different organs, systems and apparatuses. Movement games are basic ways of reaching the goals of physical education at this age level (6-7 years old). Children, actively participate in accomplishing the tasks and, because of their somatic and functional particularities, they tend to reach a higher pulse rate than in standard exercises. This is what recommends a closer attention from the teacher in order to graduate effort correctly. The purpose of the present work was to apply a protocol of density in the preparatory school grade for measuring functional density and, implicitely, effort dynamics during that particular class. The hypothesis of the research was to obtain concrete and objective data about the values of cardiac frequency during effort in preparatory school students in order to be able to graduate effort in the future. The experiment took place on November 19th 2013, at "Alexandru Macedonski" Gymnasium School in Craiova at the preparatory school grade A, teacher M.G. The density protocol was applied by the students in their 3rd year study, The Faculty of Letters - Pedagogy Primary and Preparatory School Level, Craiova. The interpretation of the density protocol was about measuring motric, pedagogical and functional density, the values of the cardiac rate by sketching the effort dynamics. All data was given to the teacher, to be rightly informed, and to be able to graduate effort correctly for the children, in the future.
Locomotory Diseases Influence on Body Equilibrium and Balance
Authors: Braun Barbu Cristian , Rosca Ileana Constanta
Published: June 2014

The paper describes a new method of body equilibrium evaluation applied for different human subjects, the principal aim being to demonstrate to what extent any locomotory diseases could influence the body stability and equilibrium. The research refers to identify some persons with different locomotory diseases and to find both the influence on equilibrium and stability and if possible to improve them. Our research stage, synthesized in this paper, explains the body equilibrium evaluation in orthostatic posture done for different subjects, aged between 20 and 40 years. A number of 10 relevant persons were considered to be evaluated, 2 of them having some locomotory diseases. The first person presents any neuro-motor stability problems in case of long standing case. The other person has both Achilles tendons torn and operated. All subjects were tested in orthostatic posture, in 3 distinct positions, using a Kistler force plate. The experiments referred to the body mass center (COM) displacement in sagittal and lateral planes, representing an interesting characteristic for its equilibrium. It was shown that the person with diseases affecting stability presented a loss of equilibrium when standing for 10-20 seconds, i.e. higher COM displacements in both planes reported to the other tested subjects.
Study Regarding Preferential and Performance-Related Lateralization in Human Motricities
Authors: Cojocaru Adin Marian , Grapă Florin , Cojocaru Marilena
Published: June 2014

Problemă: Cauza principala este de orientare sportivii folosind doar o parte a corpului exagerate de către brațul drept unilateral în timpul antrenamentului pentru începători, și antrenori goana după rezultate imediate. Deci, datorită specializării lateral unilaterală este parte din aceeași preferință. Scop: fenomen Side a fost abordat în primul rând din punctul de vedere al perspectivelor morfologice și funcționale, în cele din urmă oferindu-le o atenție aproape exclusiv de-a lungul timpului, interesul a fost parte limitat cele mai multe ori doar manifestările funcționale, cu prioritate celor extremitate și în special a mâinii. Premise Studiu: Prin urmare, cercetarea de până acum a demonstrat că depinde partea performanță mână preferată și de gradul de aceste exerciții, unele caracteristici spațiale ale sarcinilor efectuate, dar încă jocul de volei nu este cunoscut dacă performanța parte dependente și măsură, poziția pe care are jucătorul în efectuarea de servicii sau atac lovitură .. Metode de cercetare, folosind formulele de calcul a abaterii medii și standard de, am folosit testul "t" pentru comparatii aritmetice și folosite pentru a calcula corelatii intre parametrii de formare și de meci coeficientul de corelație Pearson. Discuții și concluzii: Atunci când este utilizat în pozițiile preferate ale condițiilor meci, subiecții preferați în mod semnificativ mai grupa 1, comparativ cu 5 subiecții din grupa 2 și 3, și atunci când este utilizat în poziția preferată 2 și 3 zona de serviciu preferat semnificativ 6 decât cele din grupa 1 .
Specularity Removal for Single Image Based on Inpainting and Blending with Parameter Estimation by Neural Networks over Multiple Feature Spaces
Authors: Yousaf Saqib , Qin Shi Yin
Published: June 2014

Specularity removal is useful for image related applications that need consistent object surface appearance. For a single image it can be more challenging problem due to presence of different shapes, sizes and colors of specular regions, which may have some parts with totally missing data. The problem can become more difficult if the specular regions having partial information grow bigger, because the exact boundaries are difficult to mark. Any region filling method can provide unusual results because the appropriate boundaries selection is important for these methods. In this work, we address this problem and propose a scheme which can handle specular regions by segmenting both types of sub-regions of specularity. Our segmentation algorithm is multistage which uses Luminance as well as principal components for the identification of specular regions. For specularity removal, we proposed a three step scheme which includes balancing illumination, inpainting and blending. Finally feed-forward neural network is proposed to estimate the tunning parameters, which not only automate the whole process but also simplifies the difficult task of choosing parameters like size of specular regions or preprocessing selection. The results demonstrates the effectiveness of the proposed method for a variety of images having natural specular reflection.
An Affordable Temporal Calibration Method for Common Video Camera
Authors: Roșca Gabriela , Mirescu Constantin Radu
Published: June 2014

The temporal synchronization between video capture and sensor data acquisition are provided by most of advanced data gathering systems using dedicated (and expensive) hardware. This paper raises the question that one could obtain accurate temporal assessment with a normal commercial video camera. With the help of an affordable ATmega328 microcontroller enabled board – for real time programming, and an inexpensive LED based circuit together with some image recognition software an affordable temporal calibration method was proposed that address two of the issues concerning timing of video capture: the real time for image capture and usage of external recorded timers for synchronization between various acquisition systems.
Group Decision Support Systems and Product Lifecycle Management in Robotics
Authors: Neacşa Marin , Adîr George , Adir Victor
Published: June 2014

The paper underlines the importance of the support systems for groups decisions in the decisional process of an organization, when a great number of decision-makers are working together to solve with maximum efficiency the problems appeared in different projects of the organization. A greater volume of information allows better statistical predictions, necessary in the adoption of decisions. We present a method that could solve different problems in many projects, based on the decision theory in risk and uncertainty conditions.
Research Regarding the Optimization of Work Relationships within Supply Chain by Defining and Evaluating Job Competencies
Authors: Firescu Violeta
Published: June 2014

Many general managers realize that the optimization of the production systems by using robots is not enough to increase the company performance. It has to be sustained, among other, by the supply chain management. The aim of this paper is to study the possibility of optimizing the work relationships within the supply chain by defining and evaluating the core management skills and competencies, especially soft and social competencies in the logistics operational level. The method used was the interview. The results of the qualitative method used come with new information on the subject of the paper, but only from a particular perspective - the interviewed manager has more than 10 years experience in eight different Romanian companies in logistics. The paper argues, on the one hand, that the work relationships within the supply chain are influenced by the employee’ attitude towards work and, on the other hand, that the work relationships within the supply chain can be optimized by defining and evaluating job competencies.
Towards the Development of a Cyber-Physical Systems Oriented Enterprise Architecture
Authors: Repta Dragos , Moisescu Mihnea Alexandru , Sacala Ioan Stefan , Stanescu Aurelian Mihai , Benea Monika
Published: June 2014

In recent years there has been a significant amount of research into systems that can tightly integrate physical with virtual components. This research has been concentrated in two fields: Internet of Things and Cyber Physical Systems and has been mainly driven by the possible future applications that a large-scale integration of the physical and cyber world will enable. The authors propose a generic system architecture for Cyber Intelligent Enterprise by taking into account the considered roles of a cyber-physical system.
Occupational Risk Assessment Using Knowledge Applications in Mining Industry - A Didactical Method
Authors: Rosu Luminita , Rosu Marius Sebastian , Ionita Irina , Dragoi George
Published: June 2014

The risk evaluation sustains enterprises in the uncertainties elimination in the development strategy and management policies. In Romania just few companies develop proper risk measure and cover mechanisms. Starting from this premise, this paper presents a risks evaluation method of occupational diseases at work (e.g. in the surface mining industry) and presents a method of development and use of knowledge-based applications (a didactical method) to assess these risks.
The Influence of Cr Gradient of Transition Layer on Creep Rupture Properties of Dissimilar Joint
Authors: Zhang Bo Qi , Cai Zhi Peng , Li Ke Jian , Pan Ji Luan
Published: June 2014

Abstract: In order to study the weak point and influence factor on creep rupture properties of dissimilar joint, a simulation joint which contains a transition layer has been built with the same welding parameters, the same base and weld materials as the real structure, providing theoretical principle for weld material selection and welding process optimization. In the creep rupture test of the simulation joint, most fractures are found at the fusion zone of transition layer. The existence of a softened layer at fusion zone of transition layer has been proved with metallographic observation, micro hardness test, chemical composition analysis and scanning electron microscope (SEM). The softened layer causes strain concentration and makes it much easier to fracture. A great Cr gradient between transition layers is considered as the reason of soften layer formation, since it leads carbon distribution and decreases the hardness where lack C element. In addition, some features of crystallization direction of fusion zone in transition layer have been found, which could be harmful on creep rupture properties too.
Thermal Vibration Compound Stress Relief on Thick DH36 Steel Welded Plates
Authors: Li Shu Qi , Fang Hong Yuan , Liu Xue Song , Cui Wei
Published: June 2014

Stress relief on thick and large welded components is greatly needed in various applications, such as large oil transporting pipes and offshore oil platforms. Vibration stress relief (VSR) is an relatively new method for this purpose. The efficiency of this method is a key subject, especially when the components are extremely large and it is difficult to trigger sufficient vibration amplitude in the structures. In this study, additional heating on the area near the weld line was used to promote the efficiency of VSR. Both VSR and thermal-vibration compound stress relief (TVCSR) were used to 50mm thick DH 36 steel welded plates. The Longitudinal and transverse stresses near the weld lines before and after the treatments were investigated. Comparing to VSR, the TVCSR was more effective in decreasing the residual stress. Effects of additional heating was discussed.
Device Design of Hot-Air Curing and Study on the Properties of Hot-Air Cured Phosphate Sand
Authors: Xia Lu , Long Wei , Huang Jin , Zhang You Shou
Published: June 2014

A set of hot-air curing device for phosphate sand was designed, processed and assembled, samples were made by the device, and their properties were studied. Result shows that design principle of the device is correct, hot-air remains stable; Phosphate sand can be hardened by blowing hot-air, it is suitable to assembly line like clay sand molding line because of short blowing time, for φ30mm×30mm sample, suitable blowing time is 15s when blowing temperature is 200°C,its dry compressive strength is up to 2.1MPa; The sample is not suitable for storage, because storage strength is declined sharply with high humidity although it is improved slightly with falling humidity; Compare to no-bake phosphate sand and heat-cured phosphate sand, crack on fracture surface of hot-air cured phosphate sand is invisible nearly, but fracture mode is adhesive fracture mainly, so its dry compressive strength is lower slightly.
Preparation of Antimicrobial PHEMA-g-PCBMAE Hydrogels with Improved Mechanical Properties
Authors: Zeng Ren Chang , Cheng Jiang , Xu Shou Ping , Liu Qin , Wen Xiu Fang , Pi Pi Hui
Published: June 2014

A series of poly (hydroxyethyl methacrylate)-g-polycarboxybetaine methacrylate ester (PHEMA-g-PCBMAE) hydrogels were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization in the presence of crosslinker. Then differential scanning calorimetry (DSC) was used to characterize PHEMA-g-PCBMAE hydrogels. The compression stresses of these hydrogels were investigated to evaluate the mechanical properties. The mechanical study suggested that PHEMA-g-PCBMAE hydrogels presented improved mechanical strengths comparing with polycarboxybetaine methacrylate ester (PCBMAE) hydrogel. Besides, the antimicrobial properties of PHEMA-g-PCBMAE hydrogels also estimated by usingStaphylococcus aureusas a model bacterial.
Research on the Hydration Mechanism of Portland Cement with Magnesium Slag
Authors: Deng Jun Ping , Wang Xiao Liang , Guo Yi Ping
Published: June 2014

Magnesium slag is a kind of industrial waste during the silicothermic process for magnesium reduction which has potential hydration activity. By adding 20% to 50% of magnesium slag into Portland cement, the influence principle of the additive amount of magnesium slag on the pozzolanic activity is investigated through performance testing and hydration products analysis. During the early period of hydration process, the strength of pozzolanic effectiveness ratio weakens with the increasing additive amount of magnesium slag, while during the later period of hydration process with the additive amount of magnesium slag less than 40%, the strength of pozzolanic effectiveness ratio increases with increasing additive amount of magnesium slag. The activity index of magnesium slag increases with the increase of period and additive amount, and the strength brought by hydration of magnesium slag is a key source of the strength improvement of Portland cement with magnesium slag.
Reliability Optimization Design of Composite Transmission Shaft
Authors: Cai De Yong , Liu Fu Jun , Yin Xiao Hu , Chen Fu Hong
Published: June 2014

In order to solve reliability-based optimization design of composite transmission shaft, the parametric finite element model of composite transmission shaft was built by secondary development of ABAQUS. The reliability analysis of composite transmission shaft was carried out with the first order reliability method (FORM). Using python language, the finite element program and reliability analysis program are combined. The reliability-based optimization model of composite transmission shaft was obtained. The feasibility and effectiveness of the optimization model was verified by the results of an example application.
Study on Seismic Resistant Properties of the Integral Structure after Adding Steel Storey on Top of the Multistoried Brick-Concrete Architecture
Authors: Guo Yan Hua , Cao Xi , Wang Liang
Published: June 2014

The whole quality, stiffness and damping of the structure have changed a lot after retrofitting with steel adding layer. It should make seismic response analysis for the overall structure. Use finite element analysis software SATWE to set up finite element models for a three-layer masonry structure with steel top-adding layer. Bottom layer shear, bottom layer axial force and the horizontal displacement of Y direction are obtained by using response spectrum analysis method and time history analysis method. Analysis results indicate that the stories with sudden change in stiffness show less resistance against the earthquake and require special attention in design. Under earthquakes, the analysis to determine the integrated performance of the structure is necessary.
Numerical Simulation Analyses on Thick Wall Pipe with Radial Cracks Using Circumferential Lamb Wave
Authors: Dai Xiang , Lu Chao , Chen Guo
Published: June 2014

The thick wall pipes have been widely used in the field of petrochemical industry, nuclear power, weapons and special equipment. In this paper, the propagation characteristics of circumferential Lamb wave in thick wall pipe and the interaction law with radial cracks were studied. A large number of simulation were carried out by using the commercial finite element software ABAQUS. The propagation characteristics of circumferential Lamb wave in thick wall pipe were analyzed. The research results show that the propagation process of Lamb wave in thick wall pipes are totally different from with that in the thin wall pipes, the energy distribution in the wall thickness direction are changing constantly. It is hard to evaluate the depth of smaller defects. The influence of various factors on acoustic field distribution should be considered synthetically in the practical inspection, such as the size of crystal, the angle of wedge, the excited signal. So detection sensitivity of the small defects can be improved.
The Coupling Characteristic of HSK Tool-Holder/Spindle Interface for High-Speed NC Machine Tool
Authors: Jie Wen Kai , Chen Jian , Zheng Deng Sheng , Wang Gui Cheng
Published: June 2014

The coupling characteristic of the tool-holder/spindle interface in high speed NC machine has significant influence on machine tool accuracy and process stability. With the example of HSK-E63, based on nonlinear finite element method (FEM), the coupling characteristic of the tool-holder/spindle interface under high rotational speed was investigated, the influence of interference, clamping force and rotational speed on the contact stress and the sectional area of clearance were discussed in detail. The results can be used as theoretical consideration to design and optimize the high speed tool-holder/spindle interface.
A Stability Analysis of Roll Curved Conveyer Line
Authors: Tang Yue , Wu Tao
Published: June 2014

In order to improve the conveyance stability of rubber tires on the curved roller of the automated production line, this paper analyzes the causes behind the conveying instability of tires on the curved roller in terms of the principles, and studies the relationship between the main design parameters of the roll curved conveyor line and the conveying instability of tires, providing a reference basis for the design of a stable roll curved conveyor line.
Preparation and Properties of Eu, Sb Doped SnO2 and Quartz Compound Conductive Powders
Authors: Liu Xiao Zhen , Zhu Wan Wan , Liu Xiao Zhou , Chen Jie , Wu Yan
Published: June 2014

Eu, Sb doped SnO2 and quartz compound conductive powders are prepared by the coprecipitation method with SnCl4·5H2O, SbCl3, Eu2O3 and quartz powders as the raw materials. The crystal phase and structure of the prepared conductive particles are characterized by FTIR and XRD techniques respectively. The resistivity of the prepared conductive powders are measured with four-point measurement method. The resistivity of Eu, Sb doped SnO2 and quartz compound condu-ctive powders is 0.37 Ωcm. FTIR spectrum of Eu, Sb doped SnO2 and quartz compound conductive powders shows that there are the vibration peaks in 546.14 cm-1, 489.95 cm-1, 466.71 cm-1, 430.34 cm-1 and 418.92 cm-1 respectively, and have intense absorption in 4000 cm-1 ~ 1100 cm-1. Eu, Sb doped SnO2 conductive powders have a structure of tetragonal rutile. The complex doping is achieved well by coprecipitation method and is recognized as replacement doping or caulking doping. The composition of compound conductive powders are Eu, Sb doped SnO2 conductive powders and quartz powders.
Effect of Oxygen Partial Pressure on Electrical Characteristics of Amorphous Zinc-Tin-Oxide Thin-Film Transistors
Authors: Chang Sheng Po
Published: June 2014

We fabricated and studied the electrical characteristics of thin-film transistors with an amorphous zinc-tin–oxide (a-ZTO) channel, which was deposited by radio frequency magnetron co-sputtering under different oxygen partial pressures. The effect of varying the oxygen concentration on the electrical properties and device performance of the a-ZTO TFTs was investigated. A positive shift observed in the threshold voltage with increasing oxygen suggests that the number of oxygen vacancies in the a-ZTO film decreased. With an oxygen flow rate of 4 %, a threshold voltage of 2.25 V, an on-off current ratio of 2.1 × 103, and a subthreshold slope of 0.8 V·dec−1 were obtained.
Analysis of CuO-Water Nanofluid Application on Heat Pipe
Authors: Putra Nandy , Septiadi Wayan Nata , Sahmura Ranggi
Published: June 2014

Since their first introduction to the world, both heat pipe and nanofluid have caught the interest of many researchers. Heat pipe with its unique and exceptional capability in transferring heat passively and effectively, was studied intensively and developed extensively for many applications. While nanofluid with its higher thermal conductivity and some other upgraded properties compared to conventional fluid rose as appealing research subject especially on fluid and thermal research area. This study analyzes the utilization of CuO-water nanofluid on biomaterial wick heat pipe. Laboratory-developed CuO-water nanofluid was used as working fluid for vertically straight-shaped biomaterial wick heat pipe. From the experiment, it was shown that the application of CuO-water nanofluid reduced the heat pipe thermal resistance up to 83%. It was figured out that this enhancement is due to the combination of higher thermal conductivity and better wettability of the fluid. It was also found that the heat pipe with nanofluid did not show significant degradation though being inactivated for several weeks. However, it was figured out that unlike the application of low concentration nanofluid, application of high concentration nanofluid was insignificant in improving thermal performance of the heat pipe.
Visualization Study of Dust Dispersion Process in Siwek 20-L Device for Dust Explosion Test
Authors: Du Bing , Huang Wei Xing , Kuai Nian Sheng , Yuan Jing Jie , Liu Long , Ren Yi Dan , Gan Yuan
Published: June 2014

A visualization method is proposed in order to characterize the dispersion process of dust cloud in Siwek 20-L explosion device. The visualization system consists of a transparent spherical vessel, a dust dispersion device, a high precision control valve and a high-speed camera. Experiment with wheat flour powder indicate that the non-uniformity of dust cloud in space and time can be clearly distinguished based on the frame pictures, as well as the evolution of particles settlement with time after dispersion. Moreover, qualitative analysis based on picture processing technique was carried out to obtain the transmission data of dust cloud from the frame pictures. Results show that the transmission changes rapidly with time and reaches to the minimum value at about 60 ms after dispersion, and with this time, the optimum ignition delay time can be determined for dust explosion test in Siwek 20-L device.
Investigation Colorized Property and Construct of Functional Devices for Electrochromic Coating Film
Authors: Chuang Tao Liang , Gao Yu Jia , Hua Chen Yu , Huang Huai Tzun
Published: June 2014

Use the electrochromic coating technology and the driving installation design could show various metallic color brilliance of the metallic material bracelet by this device. Experimental observations show that the green base color will transform to pink then blue and the pink base color transform to green then blue.
Prediction of Thermal Gradient in Traverse Cylindrical Grind-Hardening
Authors: Li He , Zou Jun Feng , Wang Gui Cheng
Published: June 2014

Grind-hardening is a green efficient processing technology that focus on surface harden. The paper simulated the traverse cylindrical grinding with establishing a finite element model, which revealed the thermal gradient while processing in history. And the research confirmed the possibility of prediction of the harden layer, and summarized the properties of traverse cylindrical grind-hardening.
Maleic Anhydride Grafted Modified PA6 as Compatilizer Preparation of PLA/PA6 Blend
Authors: Wu Hai Xia , Jiang Shui Qing , Cui Hai Rong , Cui Jie Yuan
Published: June 2014

This thesis is mainly about modifying PLA with PA6 as compatilizer and blending PLA with PA6. The alloying of PLA and PA6 can change the original fragility and mutability of PLA, and therefore improve its mechanical property. The blending of PLA into PA6 decreases the water absorbability and light resistance of PA6. Since PLA is of high cost, the blending of PA6 can lower the cost.
Analysis of Feed-Direction Burr Formation in Micro-Turning
Authors: Huang Jin Gui , Huang Juan , Yang Cheng , Wang Gui Cheng
Published: June 2014

A three-dimensional model of micro-turning using the finite element method (FEM) is created in this paper to analyzed the formation mechanism and influencing factors of feed-direction burr in micro-turning. According to the simulation and analysis result, in micro-turning,the deformation of the workpiece feed direction end is the combined action of the plastic bending deformation and shear slip deformation, and plastic bending deformation influences burr height and shear slip deformation affects the burr root thickness. Meanwhile, due to the amount of material involved in different deformation actions is changed, compared with conventional scale cutting, the various influencing factors have significant differences effect on the size of burr.
Influence on Pitting Corrosion Behavior of Welded AISI30400 Plate in a Freeze-Thaw Environment
Authors: Takahashi Tsuyoshi , Iwabuchi Yoshitaka , Ishitsuka Kazunori , Murakami Keita
Published: June 2014

Welded structures which set up in outdoor in snow-and cold-prone areas are exposed to severe environment, in which liquids containing Cl-chloride ions from the sea breeze and snow melting agents undergo freeze-thaw cycles during the winter. Cl-solutions are known to produce pitting corrosion in austenitic stainless steel. However, the relationship between the freeze-thaw environment and pitting corrosion occurred in welded austenitic stainless steel has not yet been clarified. In the present study, the effect of the freeze-thaw environment on pitting corrosion in welded austenitic stainless steel submersed in Cl-solutions is investigated. AISI 304 (X5CrNi18-10 in ISO/TS 15510, SUS304 in JIS G 4305) samples with bead-on-plate welding are used as specimens. The thickness of the specimen is 4 mm. The specimens are fully immersed in FeCl3 solution. The freeze-thaw environment is created by temperature cycling from 20°C to-20°C. In the meanwhile, residual stresses due to the welding process in stainless steel structures can significantly affect behavior of pitting corrosion as same as influence of sensitization. Authors carried out the welding simulation as the purpose of predicting the welding-heat history and residual stress near the welding bead.
As a result, large-scale pitting corrosion occurs primarily in areas of high tensile residual stress and sensitive metallographic structures near weld beads in the freeze-thaw environment. Accelerated pitting corrosion is confirmed to have occurred as a result of concentration cell corrosion due to the local concentration of Cl-chlorine ion around a weld bead during freezing and thawing of the solution. Furthermore, based on your study it became clear that the center position of large-scale pitting corrosion is in agreement with the simulation result rather than the stress peak position by X rays measurement.
Experimental Research on Flexural Behavior of Precast Thin-Wall Steel and Spun Concrete Composite Pile
Authors: Wang Xin Quan , Zhang Shi Min , Liao Juan , Huang Ying Sheng , Wang Chun Long
Published: June 2014

The flexural load-bearing performance prototype test has been made on the precast thin-wall steel and spun concrete composite pile with a diameter of 1000 mm (TSC pile). The load deflection curve and pile deflection curve at each loading step have been obtained. The bending test results show that the deformation of large diameter TSC pile experienced elastic, elastic-plastic and plastic three phases under the load of bending moment, the damage of pile was caused by the tension stress of steel in tension zone exceeded the yield strength, which belongs to the ductile damage. As for the TSC pile ultimate flexural bearing capacity, the measured value agreed with the theoretical calculation value, which shows that the existing thin-wall centrifugal concrete filled steel tube structure ultimate flexural bearing capacity calculation theory and method is suitable for large diameter TSC pile.
Preface
Precast Thin-wall Steel and spun Concrete composite Pile (TSC pile) is in the use of type Q235B or Q345B plate (strip) pouring of concrete filled steel tube made of crimping forming and welding, the centrifugal casting[1]. The compressive strength of concrete is not less than 80MPa, with a new pile products bear large vertical load and horizontal load. Concrete pile has the characteristics of high compressive strength, flexural capacity is weak; While the flexural capacity of steel pipe pile is strong, has good plasticity, But easy buckling occurs when the axial compression, loss of compression capability. TSC pile is a steel - concrete composite structure between steel pile and centrifugal concrete pipe pile, not only can give full play to the advantages of the both, can also overcome the shortcomings of its own when used alone[2]: With the inner wall of the concrete pipe, the outer pipe can enhance its stability ;and the inner concrete pipe with steel " confining effect", by the uniaxial stress state into three dimensional stress state, which greatly improves the compressive strength, With high anti-hammering capability, high penetration, pile sinking speed, good durability, pile quality, materials and low cost[3].
The TSC pile has been successfully applied to industry, electric power, transportation and other areas, commonly used in port engineering pile type of larger diameter, and by the wind, wave and other horizontal load, to put forward higher requirements of flexural performance of pile body. Therefore it is necessary to study the flexural behavior of large diameter pile TSC. Model test is usually the most useful method to study the pile loading behavior[4, 5].In this paper, the diameter 1000mm of TSC pile bending prototype test has been conducted, and the test is a research on the large diameter pile in TSC subjected to pure bending bearing capacity.
Experimental Study of Pure Bending of TSC Pile
The Scope of Round-Pier’s Suction Effects
Authors: Chen Qiang , Ai Wan Zheng , Wang Jia Hong
Published: June 2014

By means of the numerical simulations, the scope of round-pier suction effects is researched in this paper. The research results show that the scope of round-pier suction effects increases logarithmically with flow’s velocity when pier’s diameter is fixed and the scope increases linearly with pier’s diameter when flow’s velocity does not vary.
Mechanical Characteristics of Three-Truss Plate-Truss Composite Bridges on High-Speed Railways
Authors: Han Yan Qun , Ye Mei Xin
Published: June 2014

This paper presents a study on mechanical behaviors of three-truss plate-truss composite bridges. Both a model test and numerical finite element analysis (FEA) have been conducted. The results indicate that the deck load is allocated to each truss in twice. The first allocation is among the panel points of bottom chord elements (tie beams), and the other through lateral bracings. When the stiffness of each truss (arch) is approximate, the load allocated to middle truss is about two times more than that in edge truss in the first allocation, and the second allocation makes the load tend to approximate among 3 trusses. But the vertical bending moment of bottom chord elements and the axial force of spandrel hangers in middle truss are about twice as that in the edge truss, which should be paid attention to. The results will be useful as references for design of three-truss plate-truss composite bridges.
A Preliminary Study of the Dynamic and Control of the Solar Sail
Authors: Cubillos Ximena Celia Méndez , Drebes Rute Cardoso
Published: June 2014

The research and curiosity about outer space had been always constant. Looking for others planets, ways, civilizations wherever the exploration of the space will be a thing which the human desire. The challenge here for several years was the obtaining energy sufficient for the application of the missions. So, presently the major objective in the missions is offer more autonomy to the spacecrafts and consequently to lower the cost of the missions. Solar Sails have long been envisaged as an enabling technology because is a promising low-cost option for space exploration for it uses for propulsion an abundant resource in space: solar radiation. In this paper a simple model of solar sail is shown and studied your performance of Control System.
Analysis of the Lateral Stability for Four-Wheel Independent Driving Electric Vehicles
Authors: Zheng Liang , Ye Jun
Published: June 2014

The four-wheel independent driving EVs have been considered as the hot spot due to their excellent controlling capability of the driving force distribution in recent years. In order to achieve the excellent control capability of electric drive systems, the mechanical properties and performance need to be investigated and evaluated. In this paper, the lateral stability of four-wheel independent driving EVs is studied and the major factors are investigated. Results of the analysis indicate that the sideslip angle of the vehicle should be controlled at a small value. Under this condition, the yaw rate plays a key role on the lateral stability of the vehicle. The results in this research provide a solid guidance to considerably improve the lateral stability and the active safety of the EVs, in both theoretical and practical aspects.
Adaptive Method to Trajectory Tracking for Lane Changing
Authors: Ren Dian Bo , Zhang Guan Zhe , Wang Cong
Published: June 2014

In the presence of parametric uncertainty, the adaptive control method for lane changing of intelligent vehicle was studied. Based on the lateral dynamical model of vehicle, by applying terminal sliding mode technology, the yaw-rate tracking control law for lane changing was designed and the estimation formula for uncertain control parameters was deduced by using direct adaptive method. By using the control law and adaptive law for uncertain parameter designed in this paper, expected control performance of stability of tracking error and the convergence property of parameter estimation values was verified from the simulation.
Calculation of Effect of Viscous and Pressure Forces on Trimming Moments
Authors: Sherbaz Salma , Duan Wen Yang
Published: June 2014

In this study the effects of viscous and pressure forces on trimming moments of Series 60 (CB = 0.6) hull form are calculated at different Froude numbers by employing computational methods. The grid generator GAMBIT was used for meshing hull and computational domain. The Simulations are carried out using commercial CFD code ANSYS Fluent 13. The SIMPLE (Semi-Implicit Methods for Pressure-Linked Equations) algorithm is used for pressure-velocity coupling. The volume of Fluid (VOF) formulation is employed. The computed resistance, wave profile and trim of series 60 hull are compared with experimental values and found in reasonable agreement.
Research on Vehicle Rollover Warning System
Authors: Chen Yi Hua , Xu Jian Kang , Mao Jian Guo , Jin Zhi Lin
Published: June 2014

In this paper, a TTR vehicle rollover predication algorithm is calculated. A vehicle rollover predication model is built. Also, a vehicle rollover predication warning system is designed by using TMS320LF2407 DSP, and the warning predication theory is introduced. The results show that the rollover prediction model can predicate rollover occur time effectively and the TTR rollover predication method can be used to give direction to the driver.
Artificial Neural Networks Applied to Bandsawing Process Control
Authors: Gehring Junior Waldemar , Vieira Fábio Henrique Antunes , Affonso Carlos , Alves Manoel Cléber de Sampaio , Gonçalves Marcos Tadeu
Published: June 2014

In the search for productivity increase, industry has invested on the development of intelligent, flexible and self-adjusting method, capable of controlling processes through the assistance of autonomous systems, independently whether they are hardware or software. Notwithstanding, simulating conventional computational techniques is rather challenging, regarding the complexity and non-linearity of the production systems. Compared to traditional models, the approach with Artificial Neural Networks (ANN) performs well as noise suppression and treatment of non-linear data. Therefore, the challenges in the wood industry justify the use of ANN as a tool for process improvement and, consequently, add value to the final product. Furthermore, Artificial Intelligence techniques such as Neuro-Fuzzy Networks (NFNs) have proven effective, since NFNs combine the ability to learn from previous examples and generalize the acquired information from the ANNs with the capacity of Fuzzy Logic to transform linguistic variables in rules.
Disturbance Rejection for Discrete-Time Linear Systems with Time-Delays via Internal Model Principle
Authors: Ge Shao Ting , Liu Zhi Min , Gao Xue Xia , Wang Mei Xing , Feng Yu Qing
Published: June 2014

The disturbance rejection problem for discrete-time linear systems with both state delay and control delay is considered. Using a model transformation, the time-delay system is transformed into a nondelayed system. The disturbance rejection control law is obtained by solving its optimal regulation problem.
Develop a Magnetic Pendulum to Scavenge Human Kinetic Energy from Arm Motion
Authors: Li Jie Hong , Cai Ming Jing , Xie Long Han
Published: June 2014

This paper presented a magnetic pendulum to scavenge the human kinetic energy from arm motion and convert the kinetic energy to electrical energy for portable electronic devices. The harvester mainly consisted of a stator, a rotor and a control circuit. The stator was set of electric coils while the rotor is an eccentric mass made of permanent magnet. A torsion spring was also added onto the rotor such that the motions in both horizontal and vertical directions can be effectively harvested. The energy harvester could be worn on human arm. When the arm was in motion, the device would then generate power. The paper presented a detailed kinematical analysis and power conversion analysis. As a typical case, the device was 40 mm in diameter and 50 g in weight, the simulation showed that when worn on wrist, it could generate about 30 mW during normal walking.
Comparative Study on Low Voltage Ride-Through Test Methods for Grid-Connected Photovoltaic Inverter
Authors: Wu Wen Jin , Su Jian Hui , Wang Hai Ning
Published: June 2014

The large scale photovoltaic plants have more effects on the stability of regional power grid with the rapid increase of photovoltaic generation ratio in some areas. According to the grid guideline, the photovoltaic inverter is required to maintain the running status even the grid voltage drops and needs to have the capability to contribute towards the stability of power grid voltage and to support the grid voltage ride through. To test the ability of photovoltaic inverter low voltage ride through (LVRT), the test platform to simulate all kinds of fault for voltage drop needs to be set up. By the low voltage through technical requirements, this paper puts forward three kinds of design for test platform and analyzes respective work principle and characteristics, in order to provide optimization solution for the low voltage ride through test work.
Initial Charging Current and SOC Strategy about Battery Based on Fuzzy Logic
Authors: Chen Lun Qiong , Han Xia , Li Bei
Published: June 2014

Current attenuation rate plays an important role for battery rapid charging.This paper studied the relation between state of charge (SOC) and rebound voltage. Then the fuzzy logic control system with single-input and single-tap has been designed based on SOC and initial charging current.The results showed the maximum current attenuation rate can be achieved when the relationship of initial current and SOC arrived at an optimal value.
Optimal Virtual Power Plant Dispatching Approach
Authors: Chang Ya Chin , Chen Sung Ling , Chang Rung Fang , Lu Chan Nan
Published: June 2014

As the integrator of energy resources (DERs), a virtual power plant (VPP) would be able to control the amount of the power access to the distribution transformers such that energy efficiency can be improved. Battery energy storage system (BESS) and demand response (DR) as DERs can entrust the VPP with certain controllability to regulate the power supply of the distribution system. This paper aims to maximize the benefit of the supplied powers over the 24 hours under VPP operation. Combining an iterative dynamic programming optimal BESS schedule approach and a PSO-based DR scheme optimization approach, an optimal VPP operational method is proposed to minimize the total electricity cost with respect to the power supply limit of the distribution transformers and the system security constraints, especially, within the peak load hours. With the TOU rate given each hour, test results had confirmed the validity of the proposed method with the obviously decreased power supply in each peak-load hours and the largely reduced electricity cost accordingly.
Effect of Leading Edge Geometry on Boundary Layer Transition-An Experimental Approach
Authors: Bhatia Dinesh , Yang Guang Jun , Sun Jing , Wang Jian
Published: June 2014

Boundary layers are affected by a number of different factors. Transition of the boundary layer is very sensitive to changes in geometry, velocity and turbulence levels. An understanding of the flow characteristics over a flat plate subjected to changes in geometry, velocity and turbulence is essential to try and understand boundary layer transition. Experiments were conducted in Low Turbulence wind tunnel (LTWT) at Northwestern Polytechnical University (NWPU), China to understand the effects due to changes in geometric profiles on boundary layer transition. The leading edge of the flat plate was changed and several different configurations ranging from Aspect Ratio (AR) 1 to 12 were used. Turbulence level was kept constant at 0.02% and the velocity was kept at default value of 30 m/s. The results indicated that as the AR increases, boundary layer thickness reduces at the same location along the plate. The displacement thickness shows that the fluctuations increase with an increase with AR which denotes the effect of leading edge on turbulence spot’s production. For AR≥4, an increase in AR led to an elongation of the transition zone and a delay in transition onset.
Nomenclature
A Wheelchair Design for Topple Prevention
Authors: Chen Chu Wei , Cai Deng Chuan
Published: June 2014

Wheelchairs are an indispensable transportation tool for the aged and for the disabled. Tips and falls are common accidents to current wheelchairs, suggesting wheelchair safety is imperfect. This study thus proposed an anti-tip concept design to improve manual wheelchair safety. The anti-tip wheelchair was ergonomically designed with the following features: (1) diamond pattern wheel alignment enables users to adjust rear-wheel chamber angle and extend the front and rear casters forward and backward respectively to prevent tipping by increasing the base area; (2) adjustable wheel mechanism for indoor and outdoor uses; (3) collinear alignment of the rear-wheel axle and the center of mass in the sagittal plane reduces push frequency and enhances push power; (4) a spring-driven rear caster compression mechanism aids passing over obstacles on the ground; and (5) height adjustable neck rest provides comfort support.
A Wheelchair Design for the Elderly with Small Strength
Authors: Cai Deng Chuan
Published: June 2014

WHO reports the world population is rapidly ageing. The number of people aged 60 years and over is expected to 2 billion. The muscle strength of the elderly was decreased the ability of movement was therefore limited. Designing a facility to facilitate assist elderly for transportation is important and required. This study aims to propose a leverage wheelchair for the elderly. A serial design procedure including concept design, mechanism design, ergonomic design, and appearance design were performed in the study to create the new product. Finally, a leverage wheelchair was then proposed with following features: (1) the appearance of the leverage wheelchair demonstrated a powerful and friendly image; (2) the power transfer mechanism is designed with a power transfer mechanism which enables user to move wheelchair with a small strength; (3) the cover of the power transfer mechanism is an protection and visual element for the wheelchair; (4) the handlebar was designed with a power-saving mechanism to facilitate the elderly to move the wheelchair. It is also designed to assist user to stand up easily, (5) the handlebar was design at a position where the user can operate easily and comfortably; (6) a control button was deigned to control wheelchair going forward or backward; (7) the push handle was designed for fitting the hand of the caregiver. The results of design works, the methods and procedure used in this study can be a reference for product design and development.
Research on the Rapid Slicing Algorithm Based on Triangle Facets Ring
Authors: Yang Hui Qun , Liu Gui Jun , Wang Ting
Published: June 2014

To efficiently construct the topology of STL file is one of the key factors to improve efficiency of slicing algorithm. In this paper a topology construction algorithm based on triangle facets ring and a rapid slicing algorithm are developed, in which the flag variables are defined to reduce search range when slicing. Then the algorithm can reduce the times of traversing and sorting for the triangle facets and the times of calculation intersection in the slicing processes, and it also can simplify the process of constructing the slice contour so as to improve the efficiency of the slicing algorithm.