bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Control Method Based on Hydromechanics for Hydraulic Impact of Open Hydraulic System in Concrete Pump
Authors: Wu Wan Rong , Mao Zhen Wen
Published: March 2014

According to the working principle of open hydraulic system in concrete pump, and though the theoretical analysis on the phenomenon of hydraulic impact in direction changing process, it concluded that the impact pressure has a linear relation with the displacement of the main oil pump .To solve the hydraulic impact problem ,a variable displacement method was proposed .Under the requirement of piston not striking the bottom of cylinder and piston stroke control accuracy ,the authors optimized the pumping direction changing process time parameters and the displacement control time parameters . Though the AMESim modeling simulation and experimental study , the variable displacement control method is proved feasible on reducing the hydraulic impact in direction changing process.
On the Strengthening Methods of Steel Grid Structures Lifting
Authors: Ge Luan
Published: March 2014

During the process of grid structure lifting, the bearing capacity of some bars may overrun, because lifting point bears the main gravity of whole grid structure and the overall stress of grid structure changes [1]. Taking a steel grid structure lifting project as an example, this thesis analyzes the bearing capacity and stability of bars in the lifting process by MST software modeling. Besides, strengthening methods of bars are introduced.
Analysis and Design of Environmental Protection and Energy Saving in Modern Society Building
Authors: Zhao Jie
Published: March 2014

With the development of economy and the improvement of people's living level, improving living conditions and public buildings, architectural design requirements are also constantly improved. Modern architecture should consider not only beautiful and comfortable, but also take into account the design individuality, while taking into consideration the people-oriented design concept of environmental protection and energy saving. This also makes the environmental friendly and energy-saving building is the development direction of future architecture. This paper analyzes the modern architecture of the ecological and environmental protection, gives the method to realize the construction of energy-saving environmental protection design and the use of new materials, new equipment and new technology of the existing.
Tourism-Related Pay for Environmental Services: An Important Tool for Environmental Management
Authors: Liu Min , Liu Ai Li
Published: March 2014

Ecosystem accounts a lot to human survival and development. Ecological / environmental services has become an important part of the whole economic system functioning. Thus, from the perspective of environmental fairness and environmental controversies, pay for environmental services has become an important tool of acknowledging ecological capital and solving environmental problems. With the development of tourism, tourism-related pay for environmental services also entered the perspective of researchers and practitioners. Tourism-related pay for environmental services becomes the priority areas for the implementation of pay for environmental services because of its relatively clear property rights, clear beneficiaries, and strong capacity of payment. At the same time, Tourism-related pay for environmental services becomes the focus of enhancing the efficiency of pay for environmental services because tourism has become an important way to ecological construction and solve problems of livelihoods of local communities. This paper first proposed definition of tourism-related pay for environmental services, and then examines the standards of pay for environmental services that remains the key issue of pay for environmental services. The purpose of the paper is to provide intellectual support for the implementation of important environmental management tools.
The Influences of Process Parameters on Properties of CrNx Coatings Deposited by Closed Field Unbalanced Magnetron Sputtering
Authors: Xu Xiang Min , Zhang Hao , Jin Yi Bin , Zhang Hao Chen , Duo Shu Wang
Published: March 2014

CrNx coatings were prepared by closed filed unbalanced magnetron sputtering (CFUMS), and the effects of N2 flux ratio and bias voltage on CrN coatings were investigated. Results showed that the phase in coatings was the coexistence of CrN, Cr2N and Cr, and CrN(111) always showed an intensive preferred orientation in both cases, but CrN(200) enhanced with the rise of bias voltage. The hardness of coatings decreased with an increasing N2 flux ratio, while improved with an increasing bias voltage. The grain edges were polished off and the boundaries became blurred when higher bias voltage was applied. All in all, the surface morphologies of CrN coatings became flatter and denser with both increasing N2 content and bias voltage, respectively.
Technology Application and Stress Analysis in Quayside Container Crane's Design of New Energy-Efficient Power Generation System
Authors: Pan Rui , Fang Fan Tao , Ma Deng Yun , Zhang Min
Published: March 2014

With the port cargo throughput increasing, the number of lifting transport equipment and working hours increased. Accompanied by the rapid increase of energy consumption, energy-saving research of lifting equipment is imminent. There have designed a new type of highly efficient energy-saving power generation scheme of quayside container crane. Use ADAMS to simulate the kinematics, and combined with MATLAB to optimize and determine the final control factor.
Synthesis and Characterization of a New Type of Highnuclear Lanthanide – Cobalt Carboxylate Cluster Complex
Authors: Byambasuren Oyun Erdene , Bai Feng Hua , Zhang Yin Xia , Su Hai Quan
Published: March 2014

A new heteronuclear Ln-Co carbonyl cluster, Ce4Yb2(μ3-L)4(CF3COO)8(DMF)6Co (L=(CO)6Co2CC(COO)2-), has been synthesized by reaction of (CO)6Co2CC(COOH)2 with Ce (OOCCF3)32H2O and Yb (OOCCF3)32H2O. The cluster structure was characterized by single-crystal X-ray diffraction and IR. The crystal is monoclinic crystal system and C2/c space group. X-ray analysis revealed that the heterometallic cluster belonged to a rare class of Ln-Co carbonyl cluster bridged by carboxylate groups of carbonyl cluster ligands. The cluster was monometric unit and exhibited cage-like configuration.
Natural Gas Load Forecasting with Analysis of Environmental Resources Based on Gray Model
Authors: Shi Wei Ya
Published: March 2014

The forecast of natural gas load is a comprehensive and difficult job. In this paper, the gas load forecasting with analysis of environmental resources based on gray model is discussed. The load data of some city from 2002 to 2011 is considered. The different experiments are finished to validate the method. From the experiments, it can be conclude that the gray forecasting model is suitable to short term forecasting. In addition, it can also be found that the oldest data has little influence on the future forecasting data.
Study on High-Temperature Working Environment with the Excretion and the Levels In Vivo of Vitamin C among Heat-Exposed Workers
Authors: Liu Wei Tian , Tang Yong Mei , Wang Dao Gang , Li Ying Xue , Tian Zhen Zhen
Published: March 2014

In order to study the effect of high temperature working environment on the vitamin C excretion of steel workers and the levels in vivo, we survey and analyze vitamin C in sweat and urine from the 226 heat-exposed workers and 39 non-heat-exposed workers at the same workshop. The results of the survey show that sweating is the main way for the excretion of vitamin C under the high temperature environment, and this is also one of the main reasons for the in vivo levels of vitamin C declining. Consequently, some necessary measures should be taken to avoid damage caused by heat-exposed operation and ensure the workers enjoy good health.
Study on Environment Protection and Construction of Corporate Social Responsibility Index System
Authors: Wu Yue , Dong Zi Xiong
Published: March 2014

In recent years, most area PM2.5 of our country is high, water pollution incidents occur frequently, as the main body of the market economy, enterprises about environment protection and economic symbiosis development can not shirk its responsibility. In the qualitative and quantitative analysis, the combination of theory and practice, systematic, scientific, operational principle, constructing the index system of corporate social responsibility has important practical significance for environment protection.
Research on Energy and Environment Engineering with Heat Transfer in the Geothermal Heating System with Horizontal Wells
Authors: Lv Ming Ming , Wang Shu Zhong , Luo Xiang Rong , Luo Ming
Published: March 2014

Geothermal heating system with horizontal wells doesnt extract ground water and is not affected by the distribution of geothermal resources, which is a closed-loop and environment-friendly system. In this paper, the heat exchange between the horizontal well and rock in the geothermal heating system with horizontal wells has been studied, the heat transfer model has been built, and the heat transfer at different flow rates of water has been calculated. The results show that the outlet temperature of the horizontal well increases with the decrease of the flow rate, and the flux of heat exchange decreases with the decrease of the flow rate. The outlet temperature and the flux of heat transfer have basically the same tendency with time. The three stages are respectively rapidly change stage, moderate change stage and linear change stage.
Design and Study on Ocean Energy with the Horizontal Axis Tidal Current Turbine's Blade Especially for China's Low Tidal Current Velocity
Authors: Zhu Wan Qiang , Wu Bai Gong , Li Shuang Xin , Dong Yong Jun , Guo Jing Fu
Published: March 2014

Tidal current energy of sea surface is a kind of renewable energy with wide prospect of development. Because of its relatively high utilization ratio, the horizontal-axis turbine generation system utilizing tidal current energy has become the focus of technology development of tidal current energy all over the world. In this paper, the authors analyze the characteristics of surface tidal current energy along the coast of China. Meanwhile, we use BEM mathematical model to design the 2.5kW Horizontal Axis Tidal Current Energy Turbine Generator Blade, which is suitable for the features of tidal current energy in our country. The result of the prototypes dragging experiment indicates that this design method has good application value.
A SoC Controller for Energy Saving and Environmental Protection
Authors: Liu Li Min
Published: March 2014

The energy saving is helpful to decrease industrial emission and environment pollution. An energy saving control based on intelligent technology is a new direction of automation. An intelligent control is composed of algorithm, software and hardware. SoC is one of the most advanced hardware. SoC may get some new progress for energy saving control. In this paper, energy saving, intelligent systems and some SoC controller are discussed. The SoC controller may be more efficient for industrial automation and energy saving.
Research on Applied Technology in Experiments with Three Boosting Algorithms
Authors: Sun Xiao Wei , Zhou Hong Bo
Published: March 2014

Boosting algorithms are a means of building a strong ensemble classifier by aggregating a sequence of weak hypotheses. An ensemble consists of a set of independently trained classifiers whose predictions are combined when classifying novel instances. Previous research has shown that an ensemble as a whole is often more accurate than any of the single classifiers in the ensemble. In this paper we use applied technology to built an ensemble using a voting methodology of Boosting-BAN and Boosting-MultiTAN ensembles with 10 sub-classifiers in each one. We performed a comparison with Boosting-BAN and Boosting-MultiTAN ensembles with 25 sub-classifiers on standard benchmark datasets and the proposed technique was the most accurate. These results argue that boosting algorithms deserve more attention in machine learning and data mining communities.
Applied Mechanics and Applied Technology in Gully Erosion Measurement Based on Computer Vision with a Reference
Authors: Wu Xuan , Chen Min , Li Qiong Yan
Published: March 2014

In order to solve such problems as the difficulty of traditional monitoring of gully erosion and the high cost of modern measurement, the computer vision method was applied in gully erosion measurement in this paper, a reference was used instead of camera calibration, which makes it easy to carry out in the outside gully erosion measurement. An example is given for an actual gully erosion measurement using this method, which shows that the method is practical, simple, and with low cost. A software was also developed for using the method more easy.
Image Processing Technology Research of On-Line Thread Processing
Authors: Peng Er Bao , Zhang Guo Tong
Published: March 2014

The paper introduced image processing technology based on image segmentation about on-line threads images, and describes in detail image processing technology from image preprocessing, image gmentation,and threaded parameter test. Threaded images of on-line processing parts obtained are introduced as the key technology, Target edge extraction process from the segmented image are also recounted. At last, this article shows a comparison between actual machining parameters of screw thread and the standard parameter , provides the criterion for error compensation.
Study on Rock Conductive Law of Sandy Conglomerate Reservoir Based on Properties of Construction Materials
Authors: Tang Xiao Min , Song Yan Jie , Fu Jian , Hou Lin , Deng Xin
Published: March 2014

In this paper, based on experimental data of 17 full-diameter cores from sandy conglomerate reservoir, the relationship between various parameters and porosity /permeability in Archie Formula is studied. The average value of each parameter is given at the same time. The Archie formula has been improved, and real logging data is processed and interpreted with it. Comparison with the gas testing results shows that the improved Archie formula is proper for fluid properties evaluation in sandy conglomerate reservoir.
Innovation Capability in the Manufacturing Sector: A Review in the Perspective of Knowledge Sharing Factors
Authors: Long Choi Sang , Ghazali Nurul Izyan , Kowang Tan Owee , Rasli Amran
Published: March 2014

Innovation is a crucial issue for organizations to stay competitive especially in the manufacturing sector. As such, knowledge sharing is required to ensure the effectiveness of innovation. Knowledge sharing supports organization in fulfilling customers needs and wants. Besides that, factors that enhance knowledge sharing among employees will bring a lot of benefits to the organization itself such as enabling employees to come out with new idea and be innovative in their organization. In this paper, the authors had identified and discussed several factors that will lead to knowledge sharing intention among employees and its impact on innovation capability. These factors are leadership, trust, reward system and technology.
Dynamic Behavior Analysis of Control Valve of Hydraulic Spring Operator in High Voltage Circuit Breaker
Authors: Su Dong Hai , Chen Guang , Wang Jie , Liu Feng , Liang Quan
Published: March 2014

Control valve is the central part of operator mechanism. The property of high voltage circuit breaker mostly depends on the opening time of the control valve. This paper proposes a new way of connecting the magnetic valve and hydraulic control valve in series to realize valve multiple reversing. A mathematical model has been made to analysis the proposal. The results demonstrate that the close time of the control valve is less than 35ms, and the opening time is less than 30ms. The property meets the operating requirement.
Protective Clothing Using Nanofibers
Authors: Knížek Roman , Karhankova Denisa , Bajzík Vladimír
Published: March 2014

Currently many different types of protective garments are used designed to protect the wearer against biological contamination (e.g., bacteria) and mechanical impurities (such as dust, drops of technical fluids, etc.). Their disadvantage is that, thanks to the materials used in the requirement of a high level of protection for the user, a very low permeability even to zero, so that for example, do not allow to remove moisture and heat from the user's body and thus their use is quite uncomfortable, and conversely, in case of the requirement of good breathability and high comfort of application have very little effectiveness in detecting biological and mechanical impurities, which is not sufficient for a number of disciplines.
Research on Online Detection of Steel Plate Head and Tail Shape
Authors: Sun Ying Ke , Yao Xiao Lan
Published: March 2014

This paper aims to research the on-line measurement of the steel plate head and tail shape, and to measure the steel head and tail geometry size by using digital image processing and computer vision technology. The image gathered from high precision CCD camera is segmented with using the method based on the improved local binary fitting (LBF) model. The head and tail shape and size of steel plate is accurately measured, which provides the basis data for the follow-up steel rolling and shearing process.
Multivariable Constrained Predictive Control and its Application to a Commercial Turbofan Engine
Authors: Du Xian , Guo Ying Qing , Chen Xiao Lei
Published: March 2014

Aeroengine controller is a crucial and complex component aimed at pursing optimal performance while satisfying all kinds of physical and operational constrains. A novel control technique, multivariate constrained predictive control based on linear state space model, is applied to a commercial turbofan engine. To be specific, according to the control requirements of turbofan engine, its outputs are classified into two types, controlled or constrained; they are then incorporated into the cost function and the inequality constraint condition of baseline MPC algorithm respectively. Further, since key parameters of MPC play an important role in obtaining optimal performance, their selection is studied. It is shown that control performance using improved MPC is better than that of PID controller for a big disturbance while maintaining within prescribed constrains.
The Design of the NC Teaching Plotter Based on Single Chip Microcomputer
Authors: Shang Xin Juan
Published: March 2014

The NC Teaching Plotter is designed for the practice teaching needs of NC machining, In order to improve current existing practice teaching environment of "many student, less equipment". It explains the NC concept with concise way and demonstrates NC thought by the intuitive operation.In this paper, the design of NC teaching plotter makes interpolation motion between pen and table based on NC program in accordance with the requirement made by user, to draw the graphics by moving the magnet control brush painting through the single chip digital control and the two stepper motor control X, Y two axes feed. The NC teaching plotter which demonstrates more clearly and directly the numerical control idea has high practical value for teaching practice.
Fabrication of Multiple Al Micro-Materials by Electromigration Using a Comb Pattern and a Conductive Passivation Film
Authors: Kimura Yasuhiro , Saka Masumi
Published: March 2014

Electromigration (EM) is the phenomenon of atomic diffusion in a metallic film with a high-density electron flow. Our group used EM to fabricate Al micro-materials. The EM technique can be used to fabricate micro-materials with a high aspect ratio, pure metal components, an arbitrary form, and a single-crystal structure. Recently, two micro-materials have been simultaneously fabricated using an array pattern consisting of parallel or series connections. However, multiple micro-materials have not been fabricated simultaneously thus far. In this study, a new comb sample pattern was used with a conductive passivation film to produce multiple Al micro-materials.
Reliability Programmed Tool and its Application for Fault Tolerance Computation
Authors: Singh N.S.S. , Hamid N.H. , Asirvadam V.S.
Published: March 2014

With the continuous scaling of CMOS technology, reliability of nanobased electronic circuits is endlessly becoming a major concern. Due to this phenomenon, several computational approaches have been developed for the reliability assessment of modern logic integrated circuits. However, these analytical methodologies have a computational complexity that increases exponentially with the circuit dimension, making the whole reliability assessment process of large circuits becoming very time consuming and intractable. Therefore, to speed up the reliability assessment of large circuits, this paper firstly looks into the development of a programmed reliability tool. The Matlab-based tool is developed based on the generalization of Probabilistic Transfer Matrix (PTM) model as one of the existing reliability assessment approaches. Users have to provide description of the desired circuit in the form of Netlist that becomes the input to the programmed tool. For illustration purpose, in this paper, C17 has been used as the benchmark test circuit for its reliability computation. Secondly, reliability of a desired circuit does not only depend on its faulty gates, but it also depends on the maximum error threshold of these faulty gates above which no reliable computation is possible. For this purpose, the developed tool is employed again to find the exact error thresholds for faulty gates.
Airborne Weather Radar Cloud Simulation Based on Fractal Theory
Authors: Zhang Zhi Chun , Xu Wen , Xiong Zhuang , Xu Kun , Lu Song Yan
Published: March 2014

This paper describes a cloud simulation method of an airborne weather radar simulator based on the atmosphere characteristics of real clouds. With the fractal theory, an improved Successive Random Additions (SRA) to instruct cloud data modeling was chosen and an appropriate locus of control surfaces was selected. On the basis of the locus of control surfaces and the surface generated in the way of fractal this surface, weighted fusion generated a predetermined shape of the cloud data model. According to the generating rules, the data model was mapped to color values in the corresponding points, and the corresponding relation between height and color values was constructed. Finally, the screen cloud image of the airborne weather radar was drawn. The implementation shows that the method is real time and can be used to generate satisfied simulation radar image.
Distribution Characteristics of Fractures in the Ultra-Low Permeability Reservoirs of Anpeng Oilfield, China
Authors: Gong Lei , Guo Shu Jun , Gao Shuai , Tao Xian Xian , Huang Jian Guo
Published: March 2014

Using the data of cores, outcrops, thin sections and image logs, we analyzed the fracture distribution characteristics in the ultra-low permeability reservoirs of Anpeng oilfield. Then, we analyzed the main factors controlling the development of fractures. There are tectonic fractures and diagenetic fractures in the ultra-low permeability reservoirs. Tectonic fractures with high dip-angle are the main fracture type. Under the stresses resulting from horizontal tectonic compressions in the Early and Late Himalayan movements, three sets of tectonic fractures formed in the study area, i.e. E-W, NE-SW and NW-SE orientations. The E-W oriented fractures are developed better, then the NE-SW and NW-SE oriented fractures. The formation and distribution of these tectonic fractures are controlled by the tectonic stress field, lithology, porosity, permeability, layer thickness and structures. Under the same controlling factors, the origin types, occurrences and development characteristics of fractures in shallow-to mid-depth reservoirs are similar to that in the deep reservoirs. But fractures developed better in the deep reservoirs than that in the shallow-to mid-depth reservoirs.
The Structure and Properties of EPDM/PP/OMMT Nanocomposites by Melt Extrusion
Authors: Han Ping , Gu Zheng , Yu Yang , Li Pei Yao , Song Guo Jun
Published: March 2014

The EPDM/PP/OMMT nanocomposites were prepared with three different types of OMMT by melt extrusion method. The microstructure and mechanical properties of the nanocomposites were investigated. The intercalated structures of the nanocomposites were confirmed by transmission electron microscopy (TEM). The mechanical results showed that the OMMT (FMR242#) has the best reinforcement. When the content of OMMT was lower than 4wt. %, the mechanical properties of the nanocomposites improved greatly with the increase of the OMMT content.
Vanadium & Titanium’s Effects on High Strength Weathering Steel’s Impact Toughness in CGHAZ
Authors: Li Da Dong , Zhang Tao , Liu Jin Yan , Li Jun
Published: March 2014

The influence of impact toughness in vanadium-bearing high strength weathering steels CGHAZ was researched by welding thermal simulation in this paper. The melting and precipitation situation of V, Ti and N in the high strength weathering steel was analyzed in the process of welding thermal simulation according to relative papers. According to the research, TiN in the steel plays a decisive role in CGHAZ on its impact toughness, and give a suggestion about the content of Ti in order to promote the tested steels impact toughness in CGHAZ.
Manufacturing and Mechanical Property Evaluations of CF/PLA Biocomposites
Authors: Lou Ching Wen , Liao Jo Mei , Lin Zheng Lan , Lin Jia Horng
Published: March 2014

This study uses carbon fibers (CF) to reinforce polylactic acid (PLA) matrices to form CF/PLA biocomposites. Tensile test, flexural test, and impact test are performed on biocomposites to evaluate their mechanical properties. The results of tests show that an increment of the CF content results in an increase in tensile strength, flexural strength, flexural modulus, and impact strength. The combination of 15 wt% CF provides the resulting biocomposites with a 72 % increase in tensile strength, a 322 % increase in flexural modulus, and a 96 % increase in impact strength.
Manufacturing Technique and Property Evaluations of Tubular PLA/Spandex/Gelatin Composite Braids
Authors: Lou Ching Wen , Lu Po Ching , Hu Jin Jia , Fu Syue Wun , Lin Jia Horng
Published: March 2014

Polylactic acid (PLA) is a synthetic polymer that has biocompatibility and biodegradation. This study aims to examine the influence of manufacturing parameters on the physical properties of tubular PLA/Spandex/Gelatin composite braids. PLA fibers and spandex are combined, braided and then immersed in gelatin solution to form tubular PLA/Spandex/Gelatin composite braids. The tensile strength, bursting strength, and porosity of the resulting braids are tested, and the experiment results show that a greater twist per inch (T.P.I.) causes a higher tensile strength and bursting strength, but does not change the porosity distinctively.
Study on Efficacy of Various Solvents and Extractions on Repelling Forcipomyia taiwana
Authors: Lou Ching Wen , Lu Chao Tsang , Sie Ming Chun , Lin Jia Horng
Published: March 2014

The bites of Forcipomyia taiwana (F. taiwana) cause swelling and pruritus in sensitive skins, and are often prevented by synthetic repellents. The commercially available repellents are composes of N,N-diethyl-3-methylbenzamide, long-term use of which may results in negative influence on skins as well as nervous and immune systems. This study first examines how different organic solvents influence on the repellent effect onF. taiwana,after which solvents are used for the extraction ofCinnamomum osmophloeumKaneh,Cymbopogon excavates,Mentha,Rosmarinus officinalis,Salvia officinalis, andEucalyptus globulus.The plant extracts are tested for their repellent effect onF. taiwanawith a Y-tube test. The experiment results show that of all solvents, only water attractsF. taiwana,furthermore, with water as the solvent, except forEucalyptus globulus,all the other plant extracts, are repellent toF. taiwana.
Preparation and Properties of Alcohol-Soluble Acrylate Adhesive
Authors: Fang Hua , Li Ming Tian , Wang Ying
Published: March 2014

A kind of alcohol-soluble acrylate adhesive was synthesized by solution-polymerization. The influences of monomer ratio of soft to hard, function monomer and initiator content were studied on adhesive performance. The optimal conditions: ethanol as solvent, MA : MMA : AA : VAc = 4.5 : 4 : 1.5 : 2 : 0.8, and BPO is 0.8% of total mass, the temperature is 73 °C for 3.5 h. The properties of adhesive were determined.
Wicking Behavior and Physical Property of the Environment-Protective of Nonwoven Fabrics
Authors: Lin Jia Horng , Lin Mei Chen , Chen An Pang , Lou Ching Wen
Published: March 2014

Excessive bleeding becomes a primary cause for war wound death, accident death and operative death. Therefore, decreasing the bleeding time and operation time were play an important role in the preoperative period. In this study, the Tencel® fiber and high absorbent fiber were used to produce high absorption composite nonwoven fabrics. As the result of experiment, the higher high absorption fiber that will create the high stiffness, in addition, the nonwoven has upper stiffness at cross direction. In wicking behavior, the composite nonwoven has about absorption water reach 14 g when the high absorption fiber was 50 wt%. The assessment of application for this study anticipated the resulted high absorption composite nonwoven fabrics to be used as hemostasis material to decrease the ratio of dead person on bleeding.
Compression Behaviors of Stainless Steel Braided Coronary Stents and Polyvinyl Alcohol/Stainless Steel Braided Coronary Stents
Authors: Lin Jia Horng , Wen Shih Peng , Lou Ching Wen , Ueng Kwo Chang
Published: March 2014

With the appearance of reticular tubes, coronary stents can resist the compressive strength caused by vascular pulsation. This study braids stainless steel fibers with diameters of 0.12 mm and 0.08 mm with a braiding technique, and the resulting braids are then combined with polyvinyl alcohol (PVA) solution to form three stent types-S12, PVA/S12, and PVA/S8. S12 is braids that are made of 0.12-mm-diameter stainless steel fibers, PVA/S12 is S12 coated with PVA. PVA/S8 is braids made with 0.08-mm-diameter stainless steel fibers and then coated with PVA. Surface, braiding angle, and compression behavior of the coronary stents are observed by a stereomicroscope, analyzed by Motic Images Plus 2.0 software, and examined by an Instron 5566, respectively. The experiment results show that compared to S12 and PVA/S8, PVA/S12 has a smaller braiding angle, indicating its manufacturing process is not stable. Of the three coronary stents, PVA/S8 possesses the greatest recovery from the compression, and thus this study yields optimal coronary stents with satisfactory surface, braiding angle, and recovery ability.
Numerical Research on the Gravity Dam Deep Anti-Sliding with Engineering Mechanics Based on Damage Theory
Authors: Liu Shuang , Ren Qing Wen , Zhou Chen Lu
Published: March 2014

Currently, researches on the gravity dam deep and shallow anti-sliding stability mainly focus on the analysis method and instability criterion, while the studies on specifically test the breakage of gravity dams due to weakening foundation rock mass and structural planes under loading are rare. Based on damage mechanics theory, this paper established a numerical model that analyzed the damage failure process of dam foundation rock mass. Taking two typical gravity dam models as the study objects, the damage processes of the dam foundations were simulated dynamically. Additionally, a comparison with other two traditional methods further validated the correctness and feasibility of the numerical model. In sum, the study findings point out that the numerical model is not only applicable to the study of the breakage mechanism of dam foundation rock mass, but also can be used as a new method to analyze problems related to deep anti-sliding stability of gravity dams.
Flammability and Thermal Degradation of PMMA/Graphene Composites
Authors: Wang Zheng Zhou , Xu Shao Hong , Wu Li Xin , Zhuo Dong Xian
Published: March 2014

Graphene nanoplatelets (GNP) were prepared by ball milling, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). PMMA/GNP composites were produced by a melt process. The flammability of PMMA/GNP composite was evaluated by the cone calorimeter (Cone) and thermal degradation of the composite by thermogravimetric analyses (TGA). Cone data indicate that the incorporation of 1% GNP leads to a 12% reduction in the peak heat release rate compared to pure PMMA. The TG results show that the addition of small amount of GNP (1%) can improve thermal stability of PMMA.
Applied Research of Frequency Discriminator Based on LabVIEW
Authors: Liang Shu Lai , Li Zhao Peng , Hou Zhou Guo
Published: March 2014

This article through introduction tradition high frequency laboratory existence shortcoming and malpractice , Proposed the idea of Virtual instrument made for high-frequency laboratory ,then introduced the characteristic of LabVIEW (a development platform for virtual experiment),And proved the feasibility of using virtual machines have the discriminator through the simulation experiment .
The Research on Suppression Strategies for Electromagnetic Torque Ripples of Brushless DC Motors
Authors: Hu Lian Jun , Zeng Xiao Hui , Song Hong , Huang Xiao Long , Liu Ming
Published: March 2014

Despite of its remarkable active performances, brushless DC motors, which are widely used in mechanical engineering, have an obvious disadvantage in its high electromagnetic torque ripples. In the paper, a ripple suppression method based on predictive controls of stator currents is proposed according to analysis of causes electromagnetic torque ripples generate in commutation periods of brushless DC motors. First of all, a relative accurate prediction is acquired through DC motor on-line parameter corrections based on generalized predictive control algorithms. Then rolling optimizations make tracking errors and control qualities optimized for best control effects. And finally, minimum electromagnetic torque ripples are achieved. The simulation results show that torque ripples can be suppressed effectively with improved reliabilities by using the method proposed.
Design and Research of Freescale Smart Car Keyboard in Mechanical Manufacturing Engineering
Authors: Jiang Xu , Wu Tao
Published: March 2014

The keyboard is made up of a number of key switch matrix. It is the simplest digital input device of MCU (micro control unit). The operator inputs data or commands through the keyboard and realizes the communication between people and machine. In the process of Freescale intelligent car competition, many operations are completed by keyboard such as speed adjustment, mode switch, reference frame changing and so on. In order to improve the adaptive ability of intelligent car, the keyboard plays an important role. So the design of the keyboard also becomes a very critical process in smart car design.
Applied-Information Technology with Design and Research on Innovative DIY Training Platform of Learners Based on Mechanical Properties
Authors: Fang Fan Tao , Ma Deng Yun , Chen Ding Fang
Published: March 2014

Since the open lab cannot improve the students’ practical ability in a good manner, and the full-featured laboratory equipment has a high cost, this paper thus designs a students’ innovative DIY training platform that quickly assists to model the KT board, in order to enhance the students’ practical skills and thinking abilities, and improve the quality of experiment teaching. The platform solves the existing DIY modeling’s issues of great difficulty in manual processing, low precision and long cycle. Based on the design platform of SolidWorks, this paper completes the parametric design of the device virtual prototype, adopts the virtual prototyping technology to make dynamics simulation analysis towards the critical parts, and verifies the rationality of this mechanism design and correctness of function implementation.
Data Processing in Dynamic Traffic Capacity of Urban Road Based on Squatted Lane
Authors: Zhang He Quan
Published: March 2014

With more and more cars, rates of traffic accidents are also increasing. When there is an accident, lanes will be squatted. So the traffic capacity will be influenced. I have established a dynamic traffic capacity model based on mechanical mechanics that basic road capacity is influenced by instantaneous traffic. First of all, considering the phrase cycle of traffic lights of upstream crossing, we will set a sampling point per 60 seconds to count the number of cars that pass through the cross-section of accident in this video, and then calculate the traffic of every sampling point. Secondly, we will analyze actual traffic capacity by the line chart of traffic of cross-section and time that we evacuate queuing vehicles within 120 meters. By analyzing, we find that the actual traffic capacity at the cross-section of accident emerges fluctuation status. Based on the traditional model of road capacity and mechanical mechanics, by improving compensation factors, we can establish the model of dynamic traffic capacity at accident point.
Applied Technology in Optimization Design of Pile-Anchor Support for Foundation Pit Based on BP Neural Network
Authors: Cao Dong Wei , Zou Lu De
Published: March 2014

A new optimization method of pile-anchor support for foundation pit based on BP neural network was been proposed and applied in engineering example. Uniform test can be used to construct study samples efficiently. BP neural network is taken advantage to build a prediction model and predicting results of large number of random samples. Then, according to the constraint condition of optimization criterions, the best optimization result screened out from results. Through an engineering optimization example, it is showed that this method is efficient and with good economic and practical value.
Comfort and Function Evaluations of Warp-Knitted Fabrics
Authors: Lin Jia Horng , Huang Yu Tien , Lin Chin Mei , Lou Ching Wen
Published: March 2014

People have been paying attention to wearers comfort with functional textile products, the clothing type of which are further required to be eco-friendly and versatile as well as to help health care and to make wearers comfortable. This study uses bamboo charcoal (BC)/stainless steel (SS) wrap yarns for warp-knitted fabrics with three structural arrangements, and the influence of which on the far infrared (FIR) emissivity, softness, air permeability, and water absorption of the resulting warp-knitted fabrics are then examined. The FIR emissivity of all three fabric types is beyond 0.8. Single-faced, front-weft BC/SS warp-knitted fabrics possess optimal air permeability of 290 cm3/s/cm2and optimal softness of 3.9 cm. The results of this study can serve as reference for the research design and direction of health care fabrics and increase their added value.
Effect of Vermiculite and Bulk Density in the PU Foam Composite Board for the Absorption Coefficient and Acoustic Impedance
Authors: Liu Y.C. , Huang J.H. , Huang C.H. , Tsai M.H. , Chuang Y.C.
Published: March 2014

This article presents a comprehensive investigation in the acoustic characteristics of flame-retardant PET mesh composite fabric and PU foam with the various bulk density of foam and weight ratio of vermiculite. By using impedance tube, absorption coefficients and acoustic impedance of composite material which play an important roles in the estimation of the wave propagation passing through the specific material will be obtained. Results showed that foam with higher bulk density not only increased the material characteristics in the absorption but more importantly, cause the wider band for absorption. With the inclusion of vermiculites, the level of absorption of composite material will obviously increase, especially for the higher frequencies. Instead of 20wt% for vermiculites, the highest absorption coefficient can be found under the 15wt%. On the other hand, acoustic impedance of composite material presented in this article will slowly decrease with frequencies, and the influences of these two parameters are focused on the lower frequency range.
Low-Phosphorus Electroless Nickel-Coated Carbon Fibers
Authors: Chen Wei , Wang Jun , Wang Jun Peng , Yang Xiao Li
Published: March 2014

Carbon fibers have been coated with a nickelphosphorus (NiP) film using an electroless plating process, with sodium hypophosphite as a reducing agent in an alkaline bath. The morphology, elemental composition and phases in the coating layer of the carbon fibers were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The results revealed that a continuous, uniform and low-phosphorous nickel coating was deposited on the surface of the carbon fibers for 25 min at pH 8.0, plating bath temperature 90 °C. The as-deposited coatings with approximately 5.8 wt.% phosphorus were found to consist of microcrystalline phases.
Natural Zeolite Incorporated in Zinc Oxide Nanoparticles Doped with Manganese for Degradation of Organic Dye in Water under UV Light Irradiation
Authors: Azmi Randi , Djaja Nadia Febiana , Saleh Rosari
Published: March 2014

In this study, the photocatalytic degradation of methylene blue has been investigated using natural zeolite modified Mn-doped ZnO nanoparticles synthesized by co-precipitation method. Comparison of degradation efficiency demonstrated that natural zeolite modifiedMn-doped ZnO exhibited higher activity than bare Mn-doped ZnO.
Hydrothermal Synthesis and Characterisation of Cu Doped TiO2 Nanotubes for Photocatalytic Degradation of Methyl Orange
Authors: Razali Mohd Hasmizam , Ahmad-Fauzi M.N. , Mohamed Abdul Rahman , Sreekantan Srimala
Published: March 2014

Copper doped titanium dioxide (Cu-TiO2) nanotubes were synthesised by hydrothermal method. The samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and nitrogen gas adsorption. The photocatalytic activity of the copper doped titanium dioxide nanotubes was investigated by photodegradation of methyl orange under UV light. The structural and morphological studies showed that, the copper was incorporated into interstitial positions of the TiO2 lattice to form a new phase of TiO2 (hexagonal). The copper doped TiO2 nanotubes possessed high surface area and pore volume, results high photocatalytic activity for degradation of methyl orange (MO).
The Influence of Alkaline Treatment on Mechanical Properties and Morphology of Rice Husk Fibre Reinforced Polylactic Acid
Authors: Farah Dina Abdullah , Siti Zaleha Sa’ad , Noor Najmi Bonnia , Nor Azowa Ibrahim
Published: March 2014

This study focuses on the influence of surface treatment and fibre sizes on mechanical behavior, physical properties and morphology of rice husk fibre (RHF) reinforced polylactic-acid (PLA). Modified RHF was prepared by using 6w.t.% sodium hydroxide (NaOH) and distilled water. PLA composite reinforced with 25w.t.% volume fractions of modified RHF was mixed using the internal mixer and fabricated by the mini injection moulding. Tensile and flexural strength results showed that the PLA composite with 100, 200 and 500μm particles sizes of water treated fibre are much higher than those of alkaline treated. DSC measurement was performed and indicated that the Tg, Tm and ΔHm of PLA reduced after reinforcement with water treated and alkaline treated fibres. TGA results showed that the treatment reduced the thermal stability of the PLA. FESEM micrographs for flexural fractured surfaces of composites showed micro crack and pores due to brittle fracture of the PLA matrix adjacent to the fibre as a result of the brittle nature of the PLA resin.
Experimental Study of Impact Strength of Al-6063 Alloy Processed by Equal Channel Angular Extrusion
Authors: Sulaiman Sreenivasan , Nemati J. , Magid Hani Mizhir , Baharudin B.T.H.T. , Majzoobi G.H. , Hanim M.A. Azmah
Published: March 2014

In the present study, the impact strength of annealed Al-6063 alloy developed by equal channel angular extrusion (ECAE), up to 6 passes at a temperature of 200°C following route A with a constant ram speed of 30 mm/min through a die angle of 90° between the die channels was investigated. The impact strength of extruded specimens is evaluated for different passes at a strain rate of 1800 s-1 using Split-Hopkinson pressure bar techniques. The results indicate that the major strength improvement occurs in the 5th and 6th passes while in primary passes, the strength improved but at a considerably lower rate. A total increasing in ultimate strength (UTS) and yield strength (YS) are 127% and 65% respectively and observed for the extruded material after 6 passes. Optical microscopic examinations show a grain refinement from 45 μm to 2.8 μm.
Diffusion Bonding of Mg/Cu Alloy with Zn Interlayer Metal
Authors: Li Yan Bin , Lu Ting , Cao Le , Li Yun , Zheng Tao
Published: March 2014

AZ31B Mg alloy and Cu were joined through diffusion bonding using a Zn interlayer film prepared. The element distribution, microstructure and hardness was studied by means of scanning electron microscope(SEM), Energy Dispersive Spectrdmeter (EDS) and Microhardness tester.The result show that SEM results indicate the diffusion zone of Mg/Cu diffusion bonded joint consists of intermetallic compounds. Via enhanced holding time,these intermetallic compounds go steady gradually. Thus the Mg/Cu diffusion bonded joint of strength can be improved. This work provides a theoretical reference and practical experience for Mg/Cu dissimilar metal connection.
Prediction of Flow Stress Anisotropy and Tension Compression Asymmetry of Hot Rolled AZ31B Mg Alloy
Authors: Al-Maharbi Majid , Karaman Ibrahim
Published: March 2014

The mechanical response of a hot rolled polycrystalline AZ31B Mg plate along its two directions is predicted using a visco-plastic self-consistent (VPSC) model coupled with a dislocation-based hardening scheme. The hardening response along the in-plane and through thickness directions of the plate was successfully predicted in tension and compression. The high flow stress anisotropy and tension/compression asymmetry of the alloy is attributed mainly to the directionality of the tensile twinning. The high hardening rate after twinning is also predicted successfully using the above mentioned hardening scheme.
Thermal Modulus Evaluation of Arenga pinnata Fibre Reinforced Epoxy Composite: Effect of Moisture Absorption
Authors: Abdullah Abdul Hakim , Mohd Razali Mohd Ridzuan , Ghani Muhd Azimin A.
Published: March 2014

This paper presents the effect of moisture absorption towards thermal modulus evaluation of Arenga Pinnata fibre reinforced epoxy composite. The specimens are produced by hand lay-up method for practically with the ratio of combination of fibre with epoxy and hardener. The fibres were treated with sodium hydroxide (NaOH) prior the composites fabrication. Then, it were submerged in the water for moisture absorption and left for 8 days, 16 days and 30 days. The flexural modulus indicates there is reduction of elastic modulus values over the submerged period. Thermal analysis depicted by storage modulus curve showed the submerged specimens were not affected too much as compared to the control specimens. In fact, their performances were remaining the same across the temperature across from-10°C to 100°C. It is suggested from the experimental result that Arenga Pinnata fibres have a potential prospect as fibre reinforcement composites in many application.