bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Optimal Proportion and Properties of Stabilized Soil Using Beach Clay
Authors: Zheng Xu Wei , Li Wei , Wang Guo Cai , Sha Ling
Published: April 2014

During the period of building construction on the beach clay, the sludge foundation treatment of large area is the most important issue. The chemical strengthening of silt using curing agent is one of the effective and feasible foundation treatment methods. In order to obtain the physical characteristics of stabilized soil, a great deal of laboratory tests were done to study the strength of stabilized soil which were prepared using beach clay as raw material, cement as curing agent, composite additives as additive agent, and the best ratio for silt is obtained. The microscopic characteristics and curing mechanism of stabilized soil is studied using the microscopic test to analyze the pore structure of stabilized soil. The test results show that the ratio of the curing agent has a positive effect, and can provide fundamental basis for the engineering application of the coastal mud flat silt solidification.
Determination of Irreducible Water Saturation and its Application in Analysing Water Producing after Fracturing
Authors: Zhang Xi Wen , Cao Guang Sheng , Niu Li Juan , Wang Gui Long
Published: April 2014

Combining Semipermeable Diaphragm Method with Nonsteady State Method, Bound Water Saturation and Critical Water Saturation in Du 38 District of Daqing Fuyang Reservoir are Determined before and after Fracturing and Relationship between them is also Analyzed. the Results Show that the Fracture of Bound Water, have a Certain Influence Critical Water Saturation, and the Cracks of Bound Water, the Greater the Size Change the Greater the Value of Critical Water Saturation; Characteristics of Reservoir Microscopic Seepage is Analyzed, the Results Show that the Movable Water Potential Changes is the Main Cause of Oil well Water after Fracturing.
Yields Performance of Automotive Paint Sludge via Microwave Assisted Pyrolysis
Authors: Januri Zakiuddin , Rahman Norazah Bt Abdul , Idris Siti Shawalliah , Matali Sharmeela , Abdul Manaf Shareena Fairuz
Published: April 2014

This paper reported on the product yield of automotive paint sludge via microwave assisted pyrolysis. By having an optimum weight sample loading and power level at 500g and 1000W respectively, optimum product in terms of liquid yields has been obtained. This desired liquid product comprised hydrocarbon material since it contains oil layer and almost 40% of the product can be recovered from the automotive paint sludge with an optimum microwave parameter. Furthermore, the liquid product has a potential to be used as fuel since it exhibit high energy content at 22.6 MJ/kg.
Product Maturity-Driven Collaborative Development Flow Controlling Method for Heavy Military Vehicles
Authors: Ji Jun , Xue Gan Xin , Li Ge Yang , Chai Wei Yan
Published: April 2014

In order to effective control heavy military vehicles collaborative development flow, the paper proposes product maturity-driven collaborative development flow controlling method and defines product maturity multi-dimensional space model to describe product maturity from project, design, manufacturing, quality and other dimensions. Therefore, the paper focuses on the research of collaborative development product maturity model defining method, product maturity-based collaborative design and manufacturing business flow controlling and collaborative data pre-issuing flow. Finally, applying the five-level product maturity model and developing the collaborative development platform, the product maturity-based inter-organizational collaborative data pre-issuing was realized and the effectiveness and reasonability of the method was verified.
Morphological and Optical Characteristics of Zinc Sulfide on Silica-Modified Polyaniline Grown on Glass and Platinum-Coated Substrates
Authors: Sanico Fedil G. , Candidato Rolando T. , Vequizo Reynaldo M. , Alguno Arnold C.
Published: April 2014

Silica-modified polyaniline (SM-PAni) were deposited on glass and platinum-coated glass substrates via oxidative polymerization. Zinc sulfide (ZnS) were grown on top of SM-PAni films by chemical bath deposition. The surface and optical characteristics were investigated. SEM micrographs revealed the formation of SM-PAni nanostructures and ZnS nanospheres. Increase in nanosphere sizes were observed when Pt-coated substrates were used. UV-Vis spectra showed that SM-PAni/ZnS nanocomposites grown on both substrates exhibit good absorbance in the visible and ultraviolet region which is a good indication for potential solar cell application. Better absorbance in the ultraviolet region was observed when Pt-coated substrates was used. Vibrational peaks observed in FTIR confirmed the presence of SM-PAni particles.
The Use of Response Surface Methodology (RSM) in Experimental Design of Membrane Treatment in Treating PW from Oil and Gas Field
Authors: Shahruddin Munawar Zaman , Mohd Tengku Amran Tengku , Ghazali Nurul Aimi , Alias Nur Hashimah , Talib Mohd Noor Hakimie
Published: April 2014

Produced Water (PW) is a byproduct in the production of oil and gas. With various types of heavy metals and pollutants, it may harm human being and marine life. The objectives of this study are; 1) to study the performance of the fabricated membranes and 2) to verify the results by using the experimental design. The PW samples which is from Dulang field is treated using Polysulfone membranes that prepared by casting solutions consisting of polysulfone (PSf), N-methyl pyrrolidone (nmp), Bentonite, and polyvinyl pyrrolidone (PVP). The influence of PVP (0-7wt%) and Bentonite (0-7wt%) addition were investigated in terms of PW Flux (mL/cm2h) and TDS rejection rate (%). The amount of TDS in PW sample is 12g/L and the PSF membrane successfully reduced it up to 14%. The experimental results then used in Central Composite Model (CCM) under RSM which designate parameters (X) as Operating Pressure (bar), PVP (wt%) and Bentonite (wt%) to compute the optimum response condition (Y) as PW Flux and and TDS rejection rate in Design Expert software. The optimum condition achieved by PSf membrane is where the composition of 4.5wt% PVP, 6.0wt% Bentonite and Operating Pressure of 5.0 bar were used. Both methods showed the value of TDS decreased up to 14% after run through the membranes for several hours. Experimental and predicted result (DoE) for optimum condition is then compared to verify the error. The percent error calculated is 2.4% and 25.5% for PW Flux and TDS Rejection Rate respectively.
Discharge Criterion along the Surface of Solid Dielectric in SF6 under High Pressure
Authors: Glushkov Daniil A. , Khalyasmaa Alexandra I.
Published: April 2014

This article is devoted to the formation of a mechanism of discharge along the surface of a dielectric in sulphur hexafluoride electrode systems in different configurations. The article also addresses to the calculation of the electric field distribution and criteria for increase of discharge along the dielectric surface, depending on the field configuration, pressure and heights.
Magnetic Attenuation in Superconducting Cylinders by Beer-Lambert Modified Model
Authors: Changjan Arpapong , Punchoo Sathit , Udomsamuthirun Pongkaew
Published: April 2014

In this research, we study the magnetic attenuation of the superconducting cylinders by Beer-Lambert modified model. In optics, the Beer-Lambert model relates the absorption of light to the properties of the material through which the light is traveling. We modified Beer-Lambert model to describe behavior of magnetic field attenuation by superconducting cylinders. The penetrate field and London penetration depth are derived analytically. Finally, the attenuation of applied magnetic field is investigated and applied to cylindrical superconductors.
Tribological Properties for Cast Iron CrMo at High Temperature
Authors: Yan Yu Tao , Gan Xin Bin
Published: April 2014

The tribological properties on the friction and wear properties of cast iron CrMo and 38CrMoAlA materials under the load, temperature, sliding speed were investigated on a MMW-1 high temperature friction-wear tester. The worn surface morphology was observed and analyzed by scanning electron microscope (SEM). The results show that considering the impact of the three factors, the conclusion was that larger influence on adhesive wear was mainly test temperature and sliding speed, the influence of the load was minimal. The main influence of test temperature and sliding speed was adhesive wear. The abrasive wear and plough cut wear were mainly caused by the load. When the synergy of the load, temperature and sliding speed reach a certain condition.
Effect of Fly Ash Content on Mechanical Properties of Cement-Fly Ash Stabilized Crushed Stones
Authors: Chen Xiao , Liu Ji Wei , Zhou Ming Kai
Published: April 2014

To improve the impact of fly ash on the properties of cement-fly ash stabilized crushed stone, and promote it popularize and apply better. This paper investigated the effect of fly ash content on unconfined compressive strength, cleavage strength and resilient modulus of cement-fly ash stabilized crushed stones, and those relationships between mechanical parameters. The results showed that with increasing of the fly ash content, the unconfined compressive strength and cleavage strength increased at first, then decreased, the resilient modulus decreased, and The brittleness index increased. We can conclude that the optimal fly ash content is between 10% and 15%, and increment of fly ash content can improve its crack-resistance.
Under-Deposit Corrosion Rate Evaluation in Cooling Water System by Weight Loss, Profilometric and Electrical Resistance Methods
Authors: Rithdang K. , Wongbunyakul P. , Jamawatr P. , Lortrakul P. , Lothongkum G.
Published: April 2014

Under-deposit corrosion in cooling water system is often found in industries. The under-deposit corrosion rate in cooling water system is rarely found in a literature. The mechanism depends on the metal, types of deposit and corrosive species in the cooling water system. In this study, the under-deposit corrosion rates of carbon steel in cooling water at various times were determined by weight loss, profilometric and electrical resistance methods at 40C. From this experiment, these three methods showed the consistent results. The under-deposit corrosion rates of carbon steel were about 0.1-0.2 mm/y.
Photovoltaic Performance Improvement of Dye-Sensitized Solar Cells (DSSCs) Based on Y-Doped TiO2Thin Films
Authors: Liu Qiu Ping
Published: April 2014

Dye-sensitized solar cells based on Y-doped TiO2 thin film prepared by the hydrothermal method show a photovoltaic efficiency of 5.11%, which is higher than that of the undoped TiO2 thin film (4.72%). The Y-doped films exhibit an elevated electron Fermi level,which may enhance band bending to lower the density of empty trap states.Because of this Y-doping, the Dsscs can alleviate the decay of light to electric energy conversion efficiency due to light intensity reduction.
Effects of Laser Cladding of Silicon Carbides Particles and Iron Based Powder
Authors: Yip Mum Wai , Barnes Stuart , Sarhan Ahmed A.D.
Published: April 2014

The objective of this study was to develop clad layer by producing a Silicon Carbide (SiC) particle reinforced Metal Matrix Composite (MMC) using the iron based alloys (P25) as the matrix material. Direct laser cladding was carried out by melting the clad materials and depositing them onto a mild steel substrate. A two gravity feed system was used in this study which contained of SiC particles and iron based powder as separate powders. The intention was to melt the iron based powder and incorporate the SiC particles. Decomposition of SiC particles was observed and only a few SiC particles were found in the clad matrix. Microhardness results showed that laser clad layer had higher hardness which more than 1000 HV and hence potentially better wear resistance that base material. However, most of the SiC had evaporated which created porosity in the melt pool due to the decomposition of SiC and the resultant gas which was trapped in clad layer did not have enough time to escape from the melt pool due to the rapid solidification. Therefore, a blown powder technique is recommended for overcome this problem.
An OLED Surface-Plasmon-Polariton Mode Energy Extraction Method Using a Dielectric Extraction Layer
Authors: Lee Ho Nyeon
Published: April 2014

A new surface-plasmon-polariton mode energy extraction method using a deielectric extraction layer (DEL) was suggested. A numerical analysis was conducted to varify the feasibility of the extraction method and to find out the optimal values of the design pararmeters. Refractive index of the DEL should be larger than that of oragnic layers of organic light-emitting diodes. In addition, the thickness of the semi-transparent cathode had an optimal range.
Synthesis of Single-Crystalline Gold Nanosheet Having Multilayer Structure under the Polymeric Bulk Condition
Authors: Cha Sang Ho
Published: April 2014

A novel synthetic approach to ultrathin (< 5 nm) multilayered single crystalline gold nanosheets using amphiphilic comb-like polymer as template was presented. The poly (oxyethylene) containing decyl-tri (oxyethylene) amphiphile as well as the thioether linking group in the side chain was synthesized via polymer analogous reaction. The polymer and the gold precursor, LiAuCl4, were mixed and dried to afford a homogeneous complex. The gold precursors were reduced to gold crystals by photoreduction using long wave UV light (> 350 nm). The gold nanosheets with multilayered structure, where the layer spacing is about 3.6 nm, were obtained after 24 h. The formation of the multilayered nanosheets is due to the layered structure of the gold complex of the polymer and precursor.
Design, Manufacturing and Welding of Aluminum Alloy UHV Chambers for Taiwan Photon Source
Authors: Chang Chin Chun , Chan Che Kai , Chen Ching Lung , Hsiung Gao Yu , Chen June Rong
Published: April 2014

This paper describes the design, manufacturing and welding sequence for the aluminum alloy vacuum chamber for Taiwan Photon Source. The vacuum chamber composes of aluminum extrusion chamber of A6063 and BPM chamber of A6061 aluminum alloys. The straightness and flatness of these extrusion chambers are controlled under 0.1mm/m and 0.2mm/m, respectively. The BPM chambers are manufactured precisely in oil-free environment, which provide clean surface and a precise sealing surface after machining. All the components are assembled in pre-aligned support system through the welding process, and then the results show the straightness of < 0.15mm/m, flatness of < 0.3mm/m, and leakage rates of < 2 × 10-10 mbar‧l/sec. were achieved.
Effect of Cold Rolling Process on the Microstructure and Corrosion Behaviors of 316L Stainless Steel in Simulated Body Fluids
Authors: Mohamad W.M.F.W. , Selamat Mohd Zulkefli , Bundjali B. , Musa M.
Published: April 2014

This present paper is aims to study the influence of cold rolling process on the microstructure and corrosion behaviors of 316L stainless steel using potentiodynamics polarization testing techniques. The steel with initial thickness of 2.0 mm was unidirectional cold rolled to 10%, 30% and 50% reduction in thickness. The corrosion behaviors of the cold rolled steels were evaluated in phosphate buffered saline (PBS) as their simulated body fluids environment. The pH and temperature of the solution was maintained at 7.31 and 37°C and took approximately 5 hours for each individual test. The microstructure observations of the steels were studied using optical microscope and scanning electron microscopy (SEM). The results showed that the cold rolling process has modified the microstructure of 316L stainless steel by producing extensive surface defects. The microstructure modifications of the cold-rolled steel caused to enhance the corrosion resistance by lowering its corrosion rate to 23% and reduce the pitting resistance by lowering its breakdown potential to 61%. The pit corrosion was extensively appeared after reaching the breakdown potential.
Preparation and Characteristics of Electrospun Silver-Containing PHBV Ultrafine Fiber
Authors: Min Ming Hua , Shi Yu Yuan , Chen Xiao Xue , Shi Jian Gao , Ma Hai You , Huang Hong Liang , Wang Lu Min
Published: April 2014

The effects of synthesized silver nanoparticles on electrospun PHBV ultrafine fibers were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). Addition of silver nanoparticles increased from 0.1% to 2.0%, the sooth ultrafine fiber with an average diameter of about 2 μm formed a non-woven mat was obtained. DSC showed the efficient heterogeneous nucleation by the silver nanoparticles for facilitating PHBV crystallization.The thermal stability of the PHBV/Ag ultrafine fibers improved with the increase in the content of the silver nanoparticles.
Controlling the Growth of ZnO-SiO2 Nanostructures Using Pt-Coated Si Substrate
Authors: Peguit Amber Dea Marie V. , Candidato Rolando T. , Vequizo Reynaldo M. , Odarve Majvell Kay G. , Sambo Bianca Rae B. , Bagsican Filchito Renè G. , Gambe Jess E. , Paylaga Giovanni G. , Jabian Marven E. , Alguno Arnold C.
Published: April 2014

ZnO-SiO2 nanostructures were grown on both bare Si and Pt-coated Si substrates via chemical bath deposition (CBD). The grown nanostructures were characterized using Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (SEM-EDS), Fourier Transform Infrared (FTIR) measurement and Ultraviolet-Visible (UV-Vis) absorption spectroscopy. Surface morphology results revealed that Pt-coated Si substrate have promoted the growth of ZnO-SiO2 nanostructures by providing more active sites for nucleation thus formation ZnO-SiO2 nanostructures were observed. It is believed that SiO2 will adhere to the non-polar sides of the grown ZnO nanostructures. This result is manifested in the FTIR spectra which showed a pronounced peak corresponding to ZnO-SiO2 grown on bare Si suggesting that more Si-O bonds are present. However, Pt-coating did not significantly affect the band gap of the grown ZnO-SiO2 nanostructures.
Growth of Zinc Oxide Nanostructures on Electrochemically-Etched p-Type Silicon(100) Substrate by Chemical Bath Deposition Method
Authors: Paculba Haziel Marie D. , Alguno Arnold C.
Published: April 2014

ZnO nanostructures were successfully grown on electrochemically etched p-type Si (100) substrate via chemical bath deposition method under basic solution. These nanostructures are characterized through scanning electron microscopy – energy dispersive X-ray spectroscopy (SEM-EDS) and ultraviolet-visible spectroscopy (UV-Vis). SEM results revealed that the density of the ZnO nanorods can be controlled by changing the surface morphology of the substrate via electrochemical etching process. At around 200-400 nm, the reflectance intensity of ZnO is significantly decreased as the density of the nanorods increases. Discussion on the possible growth mechanism of ZnO on etched Si during deposition is also presented.
A Modified EEMD Decomposition for the Detection of Rolling Bearing Faults
Authors: Shi Yuan Cheng , Jiang Yong Ying , Gao Hai Feng , Xiang Jia Wei
Published: April 2014

The vibration signals of rolling element bearings are non-linear and non-stationary and the corresponding fault features are difficult to be extracted. EEMD (Ensemble empirical mode decomposition) is effective to detect bearing faults. In the present investigation, MEEMD (Modified EEMD) is presented to diagnose the outer and inner race faults of bearings. The original vibration signals are analyzed using IMFs (intrinsic mode functions) extracted by MEEMD decomposition and Hilbert spectrum in the proposed method. The numerical and experimental results of the comparison between MEEMD and EEMD indicate that the proposed method is more effective to extract the fault features of outer and inner race of bearings than EEMD.
Research on Stochastic Resonance Method Based on Bee Colony Algorithm and its Application to Bearing Fault Diagnosis
Authors: Cui Xiang Huan , Jiang Yong Ying , Gao Hai Feng , Xiang Jia Wei
Published: April 2014

The background noise makes it difficult to detect incipient faults through vibration analysis. The stochastic resonance (SR) method can be applied to enhance the signal-to-noise ratio (SNR) of a system output using the unavoidable environmental noise. The parameters selection is the most important to generate SR. The proposed fault diagnosis method utilizes the artificial bee colony algorithm to find the best parameters of SR so as to match input signals and detect faults. The performance of the proposed method is confirmed as compared to the fixed parameters method.
Effects of Temperature and Volume Agglomerate Fraction on Mechanical Response of PEMFC Electrodes
Authors: Xiao Yang , Cho Chong Du
Published: April 2014

To deal with the durability analysis of PEM fuel cell, it is necessary to carry out a further understanding of each component response, especially each layer of the MEA. So the main purpose of this paper is to understand the mechanical properties of electrode layer and find out the effect of temperature and the content of catalyst particles on the electrode yield stress. To overcome the experimental limitations, numerical method is used here. A 3-phase model of the electrode is built, which includes a user-defined material with catalyst particles. Due to the porosity of the electrode, the user-defined material is defined as a nafion ionomer glassy constitutive model by bringing in the effect of foam structure. Catalyst agglomerate particles are assumed as isotropic elastic spheres with relatively high Young’s modulus. The yield stress is extracted from the simulation, and the influences of temperature and agglomerate fraction on it are discussed.
Structural Optimization of the Telescopic Boom of a Certain Type of Truck-Mounted Crane
Authors: Chen Zhi Wei , Cui Zhe , Fu Yi Jin , Cui Wen Ping , Dong Li Juan , Jiang Wen Guang
Published: April 2014

Parametric finite element model for a commonly used telescopic boom structure of a certain type of truck-mounted crane has been established. Static analysis of the conventional design configuration was performed first. And then an optimization process has been carried out to minimize the total weight of the telescopic structures. The design variables include the geometric shape parameters of the cross-sections and the integrated structural parameters of the telescopic boom. The constraints include the maximum allowable equivalent stresses and the flexure displacements at the tip of the assembled boom structure in both the vertical direction and the circumferential direction of the rotating plane. Compared with the conventional design, the optimization design has achieved a significant weight reduction of up to 24.3%.
Mechanical Effects and Existing Problems Analysis of Anchor Frame Combination Supporting Structure
Authors: Jing Wei , Xue Wei Pei , Yang Ren Shu , Zhou Ke Lin , Li Jing Pei
Published: April 2014

This paper aims to reveal the mechanical effects of metal holder and bolt (anchor) in anchor frame combination structure, then shows existing problems of anchor frame combination supporting structure being used in present coal mine, and gives corresponding solution on the basis of modern mechanics theory. By specify examples and on the basis of having administered the pull test of bolt (anchor), the article has calculated and analyzed the stress distribution rule of metal holder in anchor frame combination supporting structure according to the statically indeterminate principle in solid mechanics. In contrast to single metal holder structure, the consequence comes to be that the bearing capacity was significantly increased. However, the actual stress values of bolt (anchor) in field measurement shows that the bearing capacity of bolt (anchor) has hot been given full work. So the essay not only reveals the good bearing capacity of anchor frame combination structure but also points out that there is plenty of scope for optimization in anchor frame combination structure, and its research results have a certain reference for supporting theory and technology research in deep level and high ground pressure soft rock roadway.
The Optimized Design of Tower Crane Hoisting System Based on the Improved Particle Swarm Optimization Algorithm
Authors: Yuan Si Cong , Wang Chao Feng , Xue Hua , An Feng , Wang Dong Hong
Published: April 2014

Tower crane hoisting system is the most important structural component of tower crane components. Its structural performance directly affects the performance of the overall tower crane. Combining the characteristics of The unconventional dedicate tower crane, established the mathematical model of hoisting system, and complied the particle swarm optimization algorithm program based on improved particle swarm optimization algorithm by MATLAB language, optimized analysis of hoisting system of The unconventional dedicate tower crane, and verified the optimization results by static analysis in the end. The result shows that the optimized analysis of tower crane hoisting system is viable and efficient by the improved particle swarm optimization algorithm.
Simulation Analysis and Experimental Research on Direct-Drive Wave Turbine
Authors: Li Yong Guo , Wang Zhen , Wang Shi Ming , Wang Lu Yu
Published: April 2014

This paper describes a new kind of direct-drive wave turbine, which collects wave energy and part of tide through a specially designed turbine device. We want to know the right flow rate,the maximum torque, the average power.Focusing on the use of ANSYS software for the model under different flow rates, we obtain important parameters such as torque and power. Then further analysis and research by experiment are proposed. We could draw a conclusion that the device is a low number of revolutions of the turbine, which unit capacity of up to 300W, suitable for the actual ocean wave gathering requirements .The article can provide practical guidance to optimize the design.
Slope Stability Analysis Based on Coupling Multiple Factors
Authors: Sun Zhong Qiang
Published: April 2014

Firstly, according to the physical makeup and the structure characteristics of landslide mass in one area, there are 6 kinds of typical hazard factors are put forward, such as mining under the ground, landslide characteristics, geological structure, and height of wave, grading angle, and rain intensity. Application of fuzzy mathematics theory, the fuzzy mathematics evaluation model on the slope stability of many factors is established. Evaluate criterion of continuous variable and discrete variable are determined based on the analysis of landslide characteristics and spatial-temporal distribution, then slope stability is evaluated, and the evaluation results are in accord with the practical situation. Finally, based on above evaluation results, Landslides Monitoring Network in mining area is established, and monitoring results proved that the landslides in the mining area are stability at present.
Polycrystalline Silicon Wafer Surface Color Defect Inspection Based on Machine Vision
Authors: Wang Han , Miao Rui , Wu Xiao Song , Ni Wang Yuan , Tang Xu Chen
Published: April 2014

As non-uniform color and complex texture exist on the polycrystalline silicon solar cell, manual surface inspection adopted by most domestic factories suffers from low efficiency and poor repetitive detection ability. To overcome the shortcomings of manual inspection, based on machine vision and SVM, an automatic silicon wafer surface defect detection and classification system has been developed in this paper: through feature extraction of color images and defect areas, a series of wafer classifiers are trained and used to separate the defective products from qualified ones. Experiments on samples and actual application in the enterprise show that the system has achieved high accuracy and fast run-time performance, indicating that machine vision is an effective and promising method for polycrystalline silicon solar cell inspection.
Research on the Effect of Prefabricated Crack Distribution about Crack Propagation
Authors: Zhu Lun
Published: April 2014

The extended finite element is known as the most promising numerical simulation method of crack propagation. In this paper Abaqus software is used to simulate the propagation of the Type I crack and verify the reliability of the numerical methods. With five different vertical distribution of pre-crack established, the paper respectively analyzes the vertical position’s influence on total crack extension form, X direction extension form and Y direction expansion form. By calculating the expansion velocity values, X direction expansion velocity values and Y direction expansion velocity values, the paper also analyzes the influence of crack location on each speed.
Experimental Study on Thermal Effect of Shear Strength of Cohesive Soil
Authors: Zhou Dong , Liu Chen Hui , Guo Bao , Yue Guan Yong
Published: April 2014

The paper mainly studies the influence rules of temperature (10°C~60°C) and curing time on shear strength indexes of cohesive soil, such as cohesion and internal friction angle, which are very significant in civil engineering works as the temperature of the earth’s surface increases. Such influence plays an even more important role in the design of the ground source heat pump and the geological disposal of high-level radioactive wastes. In this paper, the triaxial unconsolidated-undrained tests on unsaturated cohesive soil samples have recently been performed. And the testing results show that the shear strength increase as temperature and curing time increase, which is a phenomenon that needs further researches. The cementation get reinforced and the change of the content of closed air caused by the temperature curing may be the key factors.
Application of Water-Intake Methods on Open-Loop Surface Water Source Heat Pump
Authors: Zhang Wei
Published: April 2014

Natural conditions are conducive to the application of surface water source heat pump technology in Chongqing, and the application of open-loop surface water source heat pump system is more common than the close-loop style. Introduces the ultimate principle of the Water percolation and Water-intake directly method, and corresponding with the actual case, makes comparison and analysis to the main factors considered in the selection of water-intake methods.
Asbestos and Alternative Materials
Authors: Lopes Luiz Antonio Coelho , Salles LUIZ ANTONIO
Published: April 2014

Asbestos is the trade name of material widely used in construction, especially in BRICS members. The high usage of asbestos due to its low cost coupled with their properties, such as electrical resistance, tensile strength, heat resistance and some acids, in addition to its flexibility derived from its fibrous feature, which allows it to be woven. However, it is also known that asbestos in the process of extraction and production is extremely dangerous for workers. Very thin fibers tend to turn into powder that is deposited in the lungs of workers, which may lead to loss of breathing capacity, pleural plaques, some cancers, and most often a disease called asbestosis. Although there is a tendency to ban asbestos in all regions and countries, as already occurs in the European Union, Brazil, and other countries with large housing deficit, maintains the use of asbestos in the production of fiber cement tiles. The article aims to discuss the dilemma of controlled use and ban asbestos, and present the progress of the search for alternative materials to asbestos in Brazil.
The Numerical Simulation of Underwater Electric Field Sensor Calibration Traceability
Authors: Hu Ping , Yue Rui Yong , Tian Ji
Published: April 2014

The traceability of underwater electric field sensors is to track the most essential reason for underwater electric field generated by the sensor.When exploring marine electromagnetic field by underwater electric field sensors ,the underwater electric field sensor calibration traceability of the underwater electric field directly affects the final research significance .Therefore,the underwater electric field sensor calibration traceability technique is very important.The underwater electric field sensor calibration traceability is still in its infancy in our country recently .In this paper,underwater electric field sensor calibration traceability based on Ohm's law and magnetic field gradient methods are proposed through theoretical analysis and numerical simulation,which provide test methods for our underwater electric field sensor calibration and solve the bottleneck problem of underwater electric field measurements.
A Numerical Simulation of VOCs Distribution in Indoor Environment of a Dormitory
Authors: Bin Sun , Yang Zhi Hui
Published: April 2014

This document utilizes CFD simulation method to confirm the distribution of a new dormitory under the condition of natural ventilation and get the visible result and analyses the result of simulation and monitor. Because of the sealing of the room is nice, the result of the simulation value well agree with the true monitor value. By use of CFD simulation method the detailed result of indoor velocity field and pollutant concentration can be get easily. This document provides a method and theory to do further research on indoor pollutant concentration of different conditions, such as different exhaust system, different exhaust volume and different pollutant resource location.
A New Method of Continuous Blood Pressure Measurement Based on the Pulse Image Sensor
Authors: Zhang Ai Hua , Shen Rong , Zhou Xing Zhong , Lin Dong Mei , Wei Zhe
Published: April 2014

In order to find a new measurement method for continuous blood pressure (BP), pulse image sensor, pressure sensor and data acquisition card MP425 were used to build the BP simulation platform of multi-information synchronous acquisition, including dynamic pulse images, pressure on the wrist (POW) and BP signals. Multi-point pulse wave (PW) amplitudes of film grid on the pulse image sensor were extracted from the dynamic pulse images by grid area method. Diastolic BP (DBP) and systolic BP (SBP) were estimated by multi-linear regression analysis. The results show that the maximum error of SBP (mmHg) and DBP (mmHg) satisfy the AAMI requirements (mmHg).
Bearing Damage Detection Based on Sound Signal
Authors: Aswin Muhammad , Wardana I.N.G. , Irawan Yudy Surya , Suyono Hadi
Published: April 2014

This paper presents a new method in damage detection by taking the sound signals of the rolling bearings in different levels. The tested bearing was put on the end of the shaft rotated by permanent magnet synchronous motor. The sound signal produced by this rig was recorded separately for each bearing condition with the same experimental environment. The sound data signals are compared each other. Based on the cross-correlation analysis, the recorded sound signal proved that the signals were recorded with the same environment. The power spectra calculation has shown different harmonic frequencies according to various bearing conditions. The total power of the sound is decreased along with the increasing damage. This is also confirmed by the auto-correlation of each sound signal that shows the appearance of the sounds impulse repetition with a wider period.
Effect of Post Curing, Fibre Content and Resin-Hardener Mixing Ratio on the Properties of Kenaf-Aramid Hybrid Composites
Authors: Yahaya Ridwan , Sapuan S.M. , Jawaid Mohammad , Leman Zulkiflle , Zainudin E.S.
Published: April 2014

Polymer composites reinforced with high strength synthetic fibres have been used for many engineering applications. Environmental and economic issues, encourage the exploration on the introduction natural-synthetic fibre hybrid composites. Mechanical properties are critical to composite performance and may due to the manufacturing process conditions. This study investigates the effect of post curing temperature, natural fibre content and resin-hardener mixing ratio on mechanical properties of kenaf-Kevlar hybrid composites. A full factorial design (23) was carried out to determine the effect these factors on the responses: flexural strength, flexural modulus and impact strength. A statistical study has been performed in order to determine the how the factors affect the responses. The study showed that post-curing temperature, kenaf content and resin-hardener mixing ratio gives significant effects on the mechanical properties of kenaf-Kevlar hybrid composites.
The Fully Digital Controlled Corrector Magnet Power Converter with a Shunt as a Current Sensing Component
Authors: Wang Bao Sheng , Liu Chen Yao , Liu Kuo Bin
Published: April 2014

In Taiwan light source (TLS), Bira’s MCOR30 power converter modules are adopted as the corrector magnet power converters, the output is regulated by analog PWM IC that caused nonlinear behavior at zero cross and the adjustment of compensator for different kind of magnet load is inconvenient. To fulfill digital regulation control, the analog regulation IC of Bira’s MCOR30 is replaced by a fully digital regulation control circuit. With plugging the homemade fully digital regulation control card into MCOR30 that the current sensing component is a shunt that save cost of the power converter, the switching losses and output current ripple were reduced and stability of output current is improved. With the fully digital regulation control circuit, the parameters of the compensator for different magnet load are very easy to adjust.
In addition, the feasibility and validity of MOSFET switching algorism is simulated with MATLAB Simulink and the performance of this power converter is verified, the output current ripple of this power converter could be within 10ppm, which is beyond the requirement of current TLS corrector power converter and qualified to be used in the future TPS facility.
Radio Telemetry Unit for Online Monitoring System at Mining Dumps
Authors: Pies Martin , Hajovsky Radovan , Latocha Martin , Ozana Stepan
Published: April 2014

The paper deals with the description of complex monitoring system for remote monitoring of thermal processes, concentration of toxic gases and dustiness of the atmosphere. Each of these quantities is measured and consequently processed by use of wireless modules communicating with supervisor system. It presents design of communication among particular sensors and further data processing and transfer to the dispatching center.
Star-L-Shaped Circularly Polarized Ultra-Wideband Microstrip Antenna for Wireless Applications
Authors: Yuwono Rudy , Syakura Ronanobelta
Published: April 2014

The deployment of the wireless technology since FCC regulated the UWB technology spectrum was going rapidly. The wireless system that supports UWB, especially the antenna as the transducer should be UWB supported beside the other existed wireless technology, ease to fabricate and low cost. Not only that, The antenna performance should be has circular polarization to reduce misalignment. With the dimension of 60 x 60 mm made from FR-4 epoxy 0.8 mm thickness, and L-shape for the feedline with the star shape as the patch, the microstrip antenna can work at the frequency of 2 up to 9.8 GHz and has circular polarization in the frequency range of 2 up to 3.3 GHz.
Design of Horizontally Vibrating Linear Motor for Thin Smart Phone
Authors: Lee Ki Bum , Kim Jae Hee , Kim Jin Ho
Published: April 2014

Smart phone has various function and large display for convenience. However, there is some disadvantage that the smart phone is less portable than before. The thickness of the smart phone should be reduced in order to improve the portability of a smart phone. The vibrating motor is one of the thicker components in a smart phone. Therefore, we develop a horizontally vibrating linear motor that can be used to reduce the thickness of a smart phone. In order to develop a horizontally vibrating linear motor (HVLM), Mathematical vibration modeling is used, and a finite element analysis using the commercial electromagnetic analysis software MAXWELL. Also, the guide spring is designed using commercial structural analysis software ANSYS workbench. Finally, a prototype is manufactured for use in experiments. Its thickness is reduced by 30 % compared to a vertical linear vibrating motor. In addition, the motor can vibrate with an acceleration of approximately 2.10 Gravity (G).
The Optimum Number of Trays and Solvent Circulation Rate in Removing Acid Gases in Absorption Unit
Authors: Yahya Effah , Alias Nur Hashimah , Mohd Tengku Amran Tengku , Ghazalli Ahmad Hilmi
Published: April 2014

Removal of acid gases from natural gas is very important as to meet the sale’s specifications and environmental regulations. It is also a measure to minimize the corrosion effects. The most common process to remove the acid gases is amine process. There are some operating parameters which can be considered to optimize amine sweetening plant such as inlet gas temperature, lean amine circulation rate, lean amine temperature, amine concentration, number of trays and others. The objectives of the project are to study the optimum number of trays of absorber and amine circulation rate in removing acid gases in absorption unit using HYSYS simulator which capable in designing the process. By using HYSYS software, a base case of amine sweetening unit was created and di-ethanolamine (DEA) is used as the amine solvent. Four samples at different concentrations of acid gases were tested. The rules evaluated include 20 trays in the absorber and higher circulation rate. Although these rules of thumb are excellent as the starting points, violating these rules could offer considerable advantages to process efficiency. Depending on the concentration of the acid gases at the feed stream, every situation is different and requires a thorough investigation whether some changes are beneficial or not.
Research of Rough Set Theory on Forecast of Power Generation for Grid-Connected Photovoltaic System
Authors: Li Ying Zi , Deng Qiang , Lv Shou Yan
Published: April 2014

As a new soft computing method, rough set theory can deal with imprecise, inconsistent, incomplete problems, which is due to the maturity mathematical basis. Considering the environmental factors, the forecast model of grid-connected PV system based on rough sets theory was established, which has been tested and verified on the 5.6kW grid-connected PV system in Beijing Institute of Architectural Engineering. Compared the forecasting result with acture operation results of the week, month, season and year generation, it shows that former is more correct and accuracy. So the research proved that the forecasting model of rough set is practical.
A Novel Sliding Mode Control Based Low Voltage Ride through Strategy for Wind Turbine
Authors: Zeng Bin , Zou Jian Xiao , Li Kai , Xin Xiao Shuai
Published: April 2014

A novel low voltage ride through (LVRT) control strategy is designed by using sliding mode control (SMC), based on the analysis of dynamic mathematical models of the doubly fed induction generators. This method chooses two sliding surfaces according to the requirement of LVRT. It designs control strategies by combining function Lyapunov and exponential reaching law. The results of common vector control and this strategy are compared by simulation experiment of grid voltage depth dropping, which shows that the novel control strategy is better than traditional vector control strategy and is beneficial for the system quick recovery after faults£®
A Simulation of the Number of Particles Trapped by the Circulating Filter of a Hard Disk Drive and their Trajectories
Authors: Thongsri Jatuporn , Pongkom Vana
Published: April 2014

A transition shear stress transport turbulence model and a discrete phase model of Fluent software were employed to simulate numerically the trajectories of loose particles and the number of them trapped by the circulating filter of a hard disk drive (HDD). The filter was located either at the left or the right of a 2.5 inch dual platter HDD rotating at 7200 rpm. Particles were released from the middle diameter position where four head gimbal assemblies (HGAs) were located. The simulation included airflow and particle trajectories released from any of the four HGAs. The results of this simulation can help determine the efficiency of a circulating filter and its optimal placement.
Design and Simulation of Automatic Control System for Feed-Drier
Authors: Di Shu Yu , Chi Huan Yu
Published: April 2014

Based on the research on the dynamic changes of the water content in the drying stages of using Alcohol to produce high-protein feed DDGS, advanced intelligent control method is proposed and water content in the feed and the drying time are used as the main control parameter. On the basis of one for there frequency conversion and PLC, intelligent control system for the drier fan is designed to realize the efficient control of quality online detecting and recognition in the drying process. Many problems such as low accuracy, large wastage, high cost and so on are solved and thereby the work efficiency of the drying unit is enhanced. On the basis of simulation, several test-beds were built, and a large number of experimental studies. This system proves to be the most efficient with drying and optimizing the dryer index at the different stages. The calculated results indicate that the drying method has drying efficient and energy saving features.
Enhanced Cr(VI) Removal from Landfill Leachates Using Nanoscale Zero-Valent Iron
Authors: Liu Ting Yi , Wang Zhong Liang , Yan Xiao Xing
Published: April 2014

Nanoscale zero-valent iron modified by citric acid (m-NZVI) was used to remove hexavalent chromium (Cr (VI)) from landfill leachates. Citric acid was useful to enhance the dispersion of NZVI. The results demonstrated that the m-NZVI particles were uniform with a mean diameter of 45.6 nm and the specific surface area was about 22.8 m2/g. The Cr (VI) removal rates increased as an increase of the dosage of m-NZVI and the temperature but decreased as an increase of pH and the initial concentration of HA. Cr (VI) adsorption kinetics followed a pseudo-first-order rate expression and the reaction rate constants ranged from 0.05 to 0.32 min-1. X-ray photoelectron spectroscope (XPS) analysis confirmed that the Fe (III)-critic acid and/or Cr (III)-HA compounds were formed on the m-NZVI surface, which could hinder the formation of Fe (III)-Cr (III) compounds. It was also shown that removing Cr (VI) by m-NZVI was a chemical controlled and irreversible process.
Research of Fluxless Soldering of High-Purity Aluminium with Solders Type Zn-Al
Authors: Koleňák Roman , Kostolný Igor , Čička Roman
Published: April 2014

The aim of work consists in the study of interactions on solder/substrate boundary in fluxless soldering of Al with 4N purity by ultrasound activation. The ZnAg6Al6 and ZnAl4 solders were used in experiments. The soldering parameters were as follows: soldering temperature from 400 oC to 420 oC, acting time of ultrasonic vibrations 5 to 20 s, ultrasound frequency 40 kHz. Soldered joints were assessed by optical light microscopy, EDXmicroanalysis and XRD analysis. It was found out that the ZnAg6Al6 solder is composed of αAl, βZn solid solutions and AgZn3phase. The ZnAl4solder consists of βZn primary solid solution and a lamellar eutectic Zn-Al structure. The main mechanism of joint formation between the solders type Zn-Al and Al substrate during soldering consists in eutectic reaction between the liquid Zn and solid Al. An eutectic βZn-αAl mixture was observed on the joint boundary in case of both solders. In case of Al/ZnAg6Al6 joint also AgZn3intermetallic compound was observed in the transition zone.