bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact Force Identification by Using Modal Transformation Method for Automobile Test Rig
Authors: Abdul Rahman Abdul Ghaffar , Yee Khoo Shin , Ismail Zubaidah , Tong Chong Wen , Noroozi Siamak
Published: December 2013

In the automobile industry, impact force is the main cause for material fatigue in lightweight vehicles. Bump-excited impact force is the most common case, which causes damage to vehicles and reduces the quality of the ride. Force identification is important to reflect the structure's health so that action such as structure modification can be taken before material fatigue. However, direct measurement by using force transducer is not practical due to difficulty in force sensor configuration. A methodology utilizing Operating Deflection Shape (ODS) analysis, Frequency Response Function (FRF) measurement and Modal Transformation Method (MTM) to evaluate the dynamic force is proposed here. This method is called indirect force measurement by using inverse technique. The performance of this approach was demonstrated via experiment. From the measured responses and measured dynamic characteristics of an automobile test rig, a real time mathematical manipulation can generate the systems input force. The force location is known in priori for impact excitation and therefore the inverse problem is well-posed. This method was tested using different force location with unique input force. It shows that high quality of curve fitting to extract the modal parameters such as damped natural frequency, modal damping and residue mode shape is essential to obtain a high accuracy force determination result.
Assessment of Environmental Noise and Air Quality in Critical Areas at UiTM Engineering Complex
Authors: David N.V. , Ismail K.
Published: December 2013

Excessive environmental noise and poor air quality can be adverse to human health, living comfort and the environment itself. Measurement of sound pressure levels and air quality in critical areas including libraries, campus areas, public parks and hospitals thus becomes necessary to monitor and mitigate existing noise levels. In a university environment, student activities will be less disrupted if the locations of the activities are sufficiently away from noise sources. The present study is intended to measure sound levels and air quality around the Engineering Complex, Universiti Teknologi Mara, Shah Alam. The measured data is compared with to acceptable sound pressure levels and air quality index specified by the Department of Environment (DOE), Malaysia. Sound pressure levels are measured using the Castle Sound Level Meter Type 6224 and air quality measurement was done by using the BW Gas Alert MicroClip XT device. Both measurements were conducted at five selected stations around the Engineering Complex for three times each weekday for five weeks. Results obtained indicated that sound levels at some locations and time zones are above the thresholds recommended by the DOE. The air quality is acceptable in most locations except the vicinity of a bus stop. With the growing number of students in the university and other factors like construction and redevelopment of existing roads, a continuously increasing noise situations and air pollution proportional to the traffic flow is inevitable.
Correlation between Whole Body Vibration Exposure and I-KazTM 3D Coefficient for Malaysian Army 3-Tonne Truck Drivers
Authors: Aziz Shamsul Akmar Ab , Nuawi Mohd Zaki , Mohd Nor Mohd Jailani , Daruis Dian Darina Indah , Bahari Abdul Rahim
Published: December 2013

Exposure to high levels of whole body vibration (WBV) from the seat can present risks to health and safety and cause injuries to drivers. This study presents a study on WBV exposure to Malaysian Army 3-tonne truck drivers using the method defined in International Standard ISO 2631-1:1997. The vehicle that was chosen for this study was based on the highest number of vehicles available within the Malaysian Army services. 3-tonne truck is the most widely used in Malaysian Army services. WBV from the drivers were measured using tri-axial accelerometer and was connected to Brüel & Kjær Vibration Analyser Type 3649, which is capable to produce raw data to calculate the vibration dose value (VDV). The raw data from each axis were analyzed using statistical analysis method, Integrated Kurtosis Algorithm for Z-notch Filter (I-kazTM) 3D to determine the vibration values in relation to varying speed of the vehicle. Based on the results, WBV experienced by the drivers can be presented in VDV and I-kazTM 3D coefficient which the value will increase proportional to the truck speed.
A Study on Ergonomic Workstations for Standing Operators at a Manufacturing Factory in Malaysia
Authors: Md Deros Baba , Senin Nasir , Khamis Nor Kamaliana
Published: December 2013

Ergonomically designed workstation is vital towards improving health and safety of operators. This study was carried out at the assembly department to assess female operators effectiveness at standing workstations during assembling different components and parts for making electronic product in a manufacturing factory. Long working hours with static standing postures can lead to musculoskeletal disorders. The study main objectives are to assess, identify risks and body parts complaints with respect to standing workstation. The methodology use in this study includes anthropometric data measurements of female operators, standing risk assessment and body parts symptoms survey. One hundred female operators working at standing workstations took part in the study. This study revealed three major types of musculoskeletal disorders (MSDs) observed in this factory, they are pain at the shoulder region, pain at the leg region and pain at the upper back region. Based on the findings from this study, the authors have proposed a standing workstation designs that overcome the MSDs.
A Study of Engine Monitoring System Using Statistical Method
Authors: Nuawi Mohd Zaki , Khamis Nor Kamaliana , Zali Z. , Wan Mahmood Wan Mohd Faizal , Abdullah Shahrum , Mohd Nopiah Zulkifli
Published: December 2013

Various condition monitoring techniques were applied during a laboratory engine test in order to understand the wear processes occurring and to determine a suitable method which could be applicable to the detection and diagnosis of abnormal engine condition in practice. The goal of the research presented in this study is to monitor the internal combustion engine block. The proposed engine block approach is based on measuring and monitoring the engine operation in variable speed and torque using Piezoelectric Sensor. However, it normally requires analyzing the obtained signal for providing valuable information. This research involves two main procedures including data collecting as well as data analyzing. Data collecting is processes of sensor attach, run the engine and record the data while data analyzing is translating the data using data acquisition and filtering by fast furrier transform and analyzing by I-kaz and MZN methods.
The Morlet and Daubechies Wavelet Transforms for Fatigue Strain Signal Analysis
Authors: Putra T.E. , Abdullah S. , Nuawi Mohd Zaki , Yunoh Mohd Faridz Mod
Published: December 2013

This paper presents the convenient wavelet family for the fatigue strain signal analysis based on the wavelet coefficients. This study involves the Morlet and Daubechies wavelet coefficients using both the Continuous and Discrete Wavelet Transforms, respectively. The signals were collected from a front lower suspension arm of a passenger car by placing strain gauges at the highest stress locations. The car was driven over public road surfaces, i. e. pavé, highway and UKM roads. In conclusion, the Daubechies wavelet was the convenient wavelet family for the analysis. It was because the wavelet gave the higher wavelet coefficient values indicating that the resemblance between the wavelet and the signals was stronger, closer and more similar.
Performance of Robust μ Synthesis Control for Mechatronic Suspension System
Authors: Aboud Wajdi S. , Haris Sallehuddin Mohamed
Published: December 2013

The main goal of using mechatronic suspensions is to improve the ride comfort and handling performance. In this work, a robust linear controller for such a system was designed based on the μ synthesis method. The performance of a model two degree of freedom quarter car with parameter perturbations, subjected to road disturbances, was simulated and the time domain responses were analyzed. The simulation results indicate that the robust controller improved the vibration isolation performance of the mechatronic suspension system, despite the presence of parameter perturbations and exogenous disturbances. When compared to both LQG active control and to a passive suspension system, the μ synthesis controller also showed super or performance.
Improvement of Fire Retardant Property of Natural Fiber
Authors: Peng Sim Yeng , Wen Sin Yi , Xin Pang Zong , Jegachandra Sharmini , Fouladi Mohammad Hosseini , Shamel Marwan M. , Hwa Chong Chien , Namasivayam Satesh N. , Ghassem Masomeh , Nor Mohd Jailani Mohd
Published: December 2013

Excessive exposure to noise is harmful for human health. Noise-induced hearing loss is one prevalent disorder resulted from above case. One root solution that converts the unnecessary sound waves to dissipated heat energy is acoustic absorption panel. Previous studies had looked upon potential sound-absorbing resources corresponding to natural fiber. However, several characteristics of these biodegradable supplies such as stiffness, anti-fungus and flammability are still yet to be improved. Hence, this research was undertaken to enhance the fire retardant performance of coir fiber for the production of high quality yet low cost acoustic absorption panel. Three types of additives, borax, Di-Ammonium Phosphate (DAP), and urea were investigated to perform chemical treatment for coir fiber. Experimental measurements were executed to validate the results by referring standard of ASTM E6902 (Standard Test Method for Combustible Properties of Treated Wood) by using the Fire-Tube Apparatus. Final results showed that DAP-treated fiber has the lowest percentage loss in mass of 6.67% compared to that of borax and urea-treated fiber with values of 7.60% and 9.48% respectively. This outcome clarified that DAP-treated fiber possesses higher self-extinguishing ability. Further evaluations in term of economic values, degree of hazards against health, flammability as well as reactivity supported that DAP is the best choice since its potency was ahead of the other two chemicals.
Fatigue Failures of Differences Behaviour on CSM/Woven Roving Composite Materials
Authors: Arifin A.M.T. , Abdullah S. , Zulkifli Rozli , Wahab D.A.
Published: December 2013

This paper presents the investigation of composite materials lamination using different materials in the structure of lamination. The main purpose of the study is to evaluate the behaviour of characteristics in composite materials subjected to difference of fatigue loading, leading to understand the criteria that influence the behaviour of composite lamination structure. Therefore, in this research, the orientation of lamination structure used is 00/900and the material selected for the study were chopped strand mat (csm) and woven roving fabric (wr) as a reinforcement and the matrix used were polyester and epoxy resin. The composite lamination structure was produced using hand lay-up technique. The fatigue condition experiment of composite materials in this research was carried under tension-tension loading. With difference in fatigue loading condition, the lifetime of composite structure will be different and the cracking phenomenon in the structure will also be different. It is suggested that, different number of lamination and amount of reinforcement and matrix, produce a variety of materials characteristic with respect to elasticity of material. An implication of the study in this research showed various behaviour of composite materials with different materials used and it showed a difference phenomenon in comparison to metalic materials.
Translation to Rotary Frequency-Up Conversion Vibration Based Energy Harvesting Device for Human Body Motion
Authors: Suhaimi Khalis , Ramlan Roszaidi , Putra Azma
Published: December 2013

This paper presents some preliminary studies on the frequency-up conversion method for low frequency application energy vibration based harvesting device, mainly from human body motion, by employing the translation to rotary mechanism. Vibration signals from different parts of the human body were first measured when the human subject was walking at 5 km/h. The signals obtained from the measurement were then reconstructed using Fourier Transform and it was found that frequency content of human body motion was in the range of 1 Hz 25 Hz. A preliminary experiment was conducted to check on the ability of the mechanism to amplify the low excitation frequency. Although the experiment was not optimized, it is found that the device was able to amplify input frequency up to 3.6 times.
Experimental Determination of Acoustic Losses in an Acoustic Resonator Using Impedance Tube Technique
Authors: Yang David Khoo Wee , Abadlla Abakr Yousif
Published: December 2013

In order to increase the potential applications of thermoacoustic engine, coiling the resonator tube is another idea to miniaturise the engine. Resonator is an essential component used to sustain the driving acoustic waves. Coiling of resonator will definitely improve the engine footprint but it may introduce losses that are not encountered by the straight resonator. A straight resonator tube is the easiest design and will have small energy losses, but it requires large space. The proposed work in coiling the resonator will certainly create more energy losses than the previous designs but the magnitude of these losses are unknown. In this paper, an impedance tube system was built to measure the sound energy losses of coiled tubes of different configurations and comparing the results with the losses in a straight tube. The impedance tube system designed for the testing consists of an upstream tube, the test section and a downstream tube. A similar investigation was also conducted for different number of sharp turns of the tubes. The two-load method was used to analyse the results by using the four-microphone impedance tube methodology. The results showed significant differences between the four configurations and the outcomes were found to be very useful in the future when designing miniature thermoacoustic engine. Nomenclature
Application of Feed-Forward Neural Networks for Classifying Acoustics Levels in Vehicle Cabin
Authors: Junoh Ahmad Kadri , Mohd Nopiah Zulkifli , Ariffin Ahmad Kamal
Published: December 2013

Vehicle acoustical comfort and vibration in a passenger car cabin are the main factors that attract a buyer in car purchase. Numerous studies have been carried out by automotive researchers to identify and classify the acoustics level in the vehicle cabin. The objective is to form a special benchmark for acoustics level that may be referred for any acoustics improvement purpose. This study is focused on the sound quality change over the engine speed [rp to recognize the noise pattern experienced in the vehicle cabin. Since it is difficult for a passenger to express, and to evaluate the noise experienced or heard in a numerical scale, a neural network optimization approach is used to classify the acoustics levels into groups of noise annoyance levels. A feed forward neural network technique is applied for classification algorithm, where it can be divided into two phases: Learning Phase and Classification Phase. The developed model is able to classify the acoustics level into numerical scales which are meaningful for evaluation purposes.
Preprocessing and Solving Finite Element Analysis for NVH Prediction
Authors: Bin Talib Mohamad Helmi , Husain Nurulakmar Abu , Bin Fauzi Zaidi Farouk
Published: December 2013

Current vehicle development period has become shorter; therefore, virtual testing has been considered as vital to assist design decision at the early stage of the development. Over the last three decades, Finite Element Method (FEM) is widely used to predict the Noise and Vibration level of a vehicle. With the latest technology of Computer Aided Engineering (CAE) simulation, the calculation time taken for NVH analysis can be reduced from few days to only few hours. This paper presents current simulation technique for automotive development using Altair Hyperworks as preprocessing tool for vehicle modeling as well as application of NASTRAN as calculation solver. Normal Mode analysis is conducted on the Trimmed Body to investigate the natural frequency of the steering and the vehicle resonance. The result obtained is comparable with the actual prototype testing result to present the level of correlation. Coupling structural-acoustic analysis also conducted to predict the Noise Transfer Function (NTF) at the driver's ear.
Measurement of Noise inside the Compartment and Vibration on both Sides of Elastomeric Powertrain Mounts of Passenger Car
Authors: Rejab Mohd Noor Arib , Rahman Roslan Abd , Hamzah Raja Ishak Raja , Hussain Jawaid Iqbal Inayat , Ahmad Nazirah , Ismail Asyraf
Published: December 2013

This paper presents an evaluation on elastomeric mount used to isolate vibration from powertrain to chassis or structure vehicle. The assessments started with measurement of noise inside compartment, and exhaust noise. This is followed by the measurement of vibration on both sides of elastomeric mounts. The noise in the compartment and exhaust noise is measured according to BS 6086: 1981 and BS ISO 5130: 2007. The noise in the compartment and vibration is tested in three conditions. Firstly, engine is run-up with load (driving at second gear); secondly, without load; and thirdly, without load but hanging. A microphone is fixed at the ear of the mannequin. The fast response and A weighting sound level meter were used for measurement noise in the compartment and exhaust noise. The vibration is measured in terms of acceleration on both sides of each elastomeric powertrain mounts. Two accelerometer transducers are fixed on both sides of powertrain elastomeric mounts. One side was identified as a source of vibration and the other as receiver of vibrations. The results showed that the pattern of overall vibration level on source and receiver increased from 1050 RPM (idling) to 4000 RPM on all test conditions. Vibration transmitted to chassis or receiver structure was analyzed using transmissibility concept. By evaluating test condition of engine run-up without load, informed that the front and rear mounts showed a high level transmissibility contributing to structure-borne noise.
Vibration Strength Estimation of a Structure-Borne Source: Case Study for a Reception Beam
Authors: Putra Azma , Saari Noor Fariza , Bakri Hairul , Ramlan Roszaidi
Published: December 2013

This paper presents the estimation of vibration strength obtained from reception structure method. It describes a laboratory-based measurement procedure, which determines the strength of a vibration source in terms of its total squared free velocity. The source used in the experiment is a small electric fan motor. Here instead of using the usual flat rectangular plate, a thin stainless steel beam was used as the reception structure. The aim is to validate the data obtained from the reception method with that from the direct measurement. A good agreement is found between the two results, although small discrepancies occur due to the modal behavior of the beam.
Ride Evaluation of Vehicle Suspension Employing Non-Linear Inerter
Authors: Soong M.F. , Ramli Rahizar , Wan Mahadi Wan Nor Liza
Published: December 2013

Inerter is a recent element in suspension systems with the property that the generated force is proportional to the relative acceleration between its two terminals, which is similar to the way a spring reacts to relative displacement and a damper to relative velocity. This paper presents the analysis of a non-linear inerter working in parallel to passive spring and damper of a vehicle suspension to evaluate its effect on vehicles ride. The non-linear inerter was theoretically capable of switching between on and off states depending on whether or not the suspension deflection was beyond a specified free play. In the study, this behavior was represented mathematically as control law which depended on the relative displacement between the sprung and unsprung masses. A mathematical quarter vehicle model incorporating the non-linear inerter was simulated in MATLAB/Simulink to determine the vehicle responses due to road input in the form of step profile for different combinations of free play and inerters on-state proportionality constant called the inertance. Results showed improvements in vehicle ride comfort, as demonstrated by the lower root-mean-squared sprung mass accelerations compared to the ordinary passive suspension with only spring and damper. Additionally, implementation of non-linear inerter gave lower percentage overshoot to step input, indicating better transient response than ordinary passive suspension.
Improved Algorithm of Fractal Compression Based on Average Deviation
Authors: Qin Xiao Li , Luo Wei , Li Yu Ping , Xie Zheng Hui , Ye Lu
Published: December 2013

Aiming at deficiency of fractal image compression, encoding time length and large amount of calculation, an improved algorithm of fractal compression is proposed based on the average deviation. First,divided image into blocks by using the characteristics of the average deviation, then determined the image block matching constraints by the application of the scale factor to simplify the calculation method, and finally limited the search range with the constraints, thus decrease the amount of the search range, improve the efficiency of the domain block matching. The simulation results show that the improved algorithm can reduce the computation of block matching, and improve the fractal image coding efficiency.
Job-Shop Scheduling on Exhibition Logistics Based on Genetic Algorithms
Authors: Chen Zhi Gang , Yang Tao , Li He Hua
Published: December 2013

The exhibition logistics, which generally deals with set-up, breakdown, transport, and storage to ensure that all specific exhibition requirements are met. It is very special from traditional logistics service that its transportation distant is very short and transportation cost can almost be ignored. To address the problems. a modal to optimize the total cost of exhibition logistics provider was proposed in this paper. Firstly the framwork of exhibition logistics was illustrated by a job-shop schedule modal. Secondly we used genetic algorithm (GA) to deal with problem of job shop scheduling. Finally the experiment result indicate that the proposed algorithm is feasible and effiective for this problem.
Study of Micro Vibration Measurement Using the Model of STM
Authors: Li Meng Chao
Published: December 2013

Scanning tunneling microscopy is one of the surface measurement instruments in nanotechnology field, and the vertical resolution is about 0.01nm. So it is easily affected by the external micro vibration, conversely, we can measure the micro vibration using the working principle of STM. As we all know, the tunneling effect is the negative index relation between the tunneling current and the tunneling gap. On the other hand, the vibration measurement results can be used to offer the foundation in order to reduce the influence of micro random vibration for STM, it is necessary to measure the external vibration to compensate the experiment results of scanning tunneling microscoy. So the experimental device is developed and experiment of vibration detection is made. The experiment results show that results have high sensitivity, good frequency characteristic and the same vibratory response characteristic consistent with scanning tunneling microscopy.
A Enterprises Supplier Evaluating System Using Fuzzy-AHP
Authors: Cai Lan , Guo Shun Sheng , Zhou Lu Ming
Published: December 2013

Supplier selection is a multi-criteria decision making problem which includes evaluation factors. In order to select the best suppliers, it is crucial to considering the both qualitative and quantitative factors simultaneously. The analytic hierarchy Process is a kind of Decision-making method with the combination of quantity and quality. Combining with fuzzy algorithm, this paper established a supplier evaluating system based on ERP database, discussing many issues in the systematic design and developing the implement step. The system make the evaluation process transparent by using data mining and fuzzy-AHP algorithm, and avoid the disturbing from excessively subjective factors. Thus it can guarantee the fairness of the assessment. Finally, the example and conclusion are given.
The Application of Parametric Acoustic Receiving Array to Vehicle Radiated Underwater Noise Measurement
Authors: Li Song Wen
Published: December 2013

Parametric acoustic receiving array has the advantage of achieving high directional index for low frequency signals with very simple sensor arrangement. This characteristic is suitable for vehicle radiated noise measurement in costal area and in the far field of the target vehicle. This paper gives a design for such application of parametric acoustic receiving array with the calculation of possible ability that can be achieved.
Space-Time Chebyshev Pseudospectral Method for Burgers Equation
Authors: Liu Jia Chun , Qian Xiao Hui
Published: December 2013

In this paper, we present a new method for solving of the one dimensional Burgers equation, that is the space-time Chebyshev pseudospectral method. Firstly, we discretize the Burgers equation in one dimensional space with Chebyshev pseudospectral method. Finally, numerical results obtained by this way are compared with the exact solution to show the efficiency of the method. The numerical results demonstrate high accuracy and stability of this method.
A Smoothing Newton Method for Nonlinear Complementarity Problems
Authors: Feng Ning , Tian Zhi Yuan , Qu Xin Lei
Published: December 2013

A new FB-function based on the P0 function is given in this paper. The nonlinear complementarity problem is reformulated to solve equivalent equations based on the FB-function. A modified smooth Newton method is proposed for nonlinear complementarity problem. Under mild conditions, the global convergence of the algorithm is proved. The numerical experiment shows that the algorithm is potentially efficient.
Privacy-Preserving Decentralized Key-Policy Attribute-Based Signcryption in Cloud Computing Environments
Authors: Meng Xian Yong , Chen Zhong , Meng Xiang Yu
Published: December 2013

In this paper, a novel decentralized key-policy attribute-based signcryption (ABS) scheme is proposed, where each authority can generate secret-public key pair for the user independently without any cooperation and a centralized authority. In the proposed scheme, each authority can join or leave the system randomly without reinitializing the system,and issue secret-public keys to user respectively. Therefore, it is clear that the multi-authority attribute-based access control scheme can reduce the communication cost and the collaborative computing cost. Additionally, the attribute-based signcryption scheme is efficient in terms of both the identification authentication and the confidential communication, and can realize security secret sharing in cloud computing environments.
Online Information Database - A Useful Tool in Terminology Translation
Authors: Wang Zheng
Published: December 2013

Translation or translating is a communicative activity or dynamic process in which the translator makes great effort to thoroughly comprehend a written message or text in the source language and works very hard to achieve an adequate or an almost identical reproduction in the target language version of the written source language message or text. The role of the knowledge base is essential in both comprehension and reformulation. The extent of knowledge acquisitions in each translation depends on the degree to which the translators knowledge base provides the information or knowledge required to deal with the source-language text. Terminology is where most practical problems lie in technical and scientific translation. Generally speaking, translators knowledge base in terminology is inadequate in comprehension and reformulation of terminology. So knowledge acquisition plays an important role in both the comprehension phase and the reformulation phase. This paper mainly explores significant role of information database as a knowledge acquisition tool in terminology translation, one of the most commonly encountered difficulties during technical translation and meanwhile offers useful suggestions of how to use information database and its search result to refine terminology translation
Sense of Community and Continuance Intention towards Online Language Learning
Authors: Zhao Rong , Xu Yi Ming
Published: December 2013

This study adopted ECM to explore the effect of sense of community (SOC) on learners continuance intention towards online language learning. It is proved that the continuance intention is dependent on the SOC, perceived usefulness and satisfaction.
Hadoop: Analysis of Cloud Computing Infrastructure
Authors: Zhang Wei Feng , Wang Tin
Published: December 2013

As a kind of cloud computing infrastructure, Hadoop has attracted more attention from a group of corporations and has been widely used. The framework and character of Hadoop were detailed introduced and analyzed as well as the application opportunities of Hadoop in the field of communication in the future were prospected in this paper. An application based on Hadoop was designed and experiment result demonstrates the efficiency of Hadoop on dealing with big dataset.
The Empirical Research of Network Teaching System Based on Webquest and Mindmap
Authors: Jiang Zhong Yun
Published: December 2013

In the basis of the integration of traditional and network teaching, a network teaching system based on webquest and mindmap was established. Around webquest and mindmap, the main modules of the system had been designed and a new inquiry teaching model had been established, in which the teacher-leading and student-centered idea was introduced and intellectual analysis feedback circle was designed. By inputting teaching tasks, teaching situation and teaching resources, and by means of teacher's just-in-time guidance and student's thinking and inquiry, the system could output the final complete mind maps and inquiry conclusions. The system was applied to the "principles of computer network" course and empirical research was carried out in the experimental class. The experimental results show that, the network teaching system can stimulate student's learning interest, and improve student's comprehensive qualities and innovation ability.
Study of the Prospects of the Use of High-Strength Steel Shapes
Authors: Parlashkevich Valentina , Tsyba Oleg
Published: December 2013

The prospects of the use of rolled shapes made of high-strength steels in steel structural elements are considered. A comparative analysis of strength values and economic indices of steel structural elements is done for their work in compression, tension and bending.
Study on Novel Relaxor Ferroelectric Single Crystal PMNT/Epoxy Composite
Authors: Li Guang , Luan Gui Dong , Qu Hao
Published: December 2013

Use relaxor ferroelectric single crystals PMNT as piezoelectric phase, epoxy resin as a non-piezoelectric phase material, take the cutting - filling method fabricated piezoelectric composite. Its structure character is achieved 1-3 type piezoelectric composites and piezoelectric crystal substrate composite again inseries by the integration, the composite horizontal and vertical bracket to be supported by piezoelectric crystal frame, it has a good impact resistance and affected by changes in ambient temperature characteristics. This composite material both has the advantages of 1-3 type composites, and has stable mechanical and thermal properties. Based on R.E.Newnhams series-parallel theory, combined with the structural characteristics of this composite, given the formula of piezoelectric composites density, piezoelectric constant, and dielectric constant. Fabricated the PMNT / epoxy composites and piezoelectric PZT / epoxy piezoelectric composite materials samples, which have the same scale, the same structural parameters. The experimental results show that, the piezoelectric composite test parameter values match theoretical calculations. The PMNT/epoxy composite has batter function than PZT/epoxy composite.
Acid Strength Measurement of Zeolites by the TPD-IR Technique with Ammonia as Probe Molecule
Authors: Wang Bin , Zhang Ying , Gu Fu Bo , Zuo Min , Guo Guang Sheng
Published: December 2013

An improved TPD-IR technique was developed recently. By which means, acid properties of Brønsted acid sites on HY zeolite and SAPO-34 zeolite were studied by an advanced TPD-IR technique with ammonia as probe molecule. Desorption activation energy (DAE) of the probe molecule adsorbed on zeolite was used as a measure of the acid strength. The result indicates the Brønsted acid sites of HY Zeolite or SAPO-34 zeolite were divided into two types with the strength of DAE of ammonia 43.4KJ/mol, 24.4KJ/mol and 33.2KJ/mol, 20.5KJ/mol. It is concluded that HY zeolite has the stronger Brønsted acid sites than that of SAPO-34 zeolite.
Deposition and Characterization of Boron Doped ZnO Thin Films by Ultrasonic Spray Pyrolysis Method
Authors: Yang Ling , Zhang Yu Pei , Xu Ji Wen , Wang Hua
Published: December 2013

Boron doped ZnO (BZO) thin films were deposited on glass substrate by ultrasonic spray pyrolysis method using zinc acetylacetonate and boric acid. The structural, morphological, optical and electrical properties of BZO thin films under various doping level of boron and substrate temperature were investigated. The results show that zinc acetylacetonate is helpful to deposit BZO thin films at low temperature. The morphology of grains at low and high substrate temperature is circular and flake-like. The preferred orientation along (101) plane is obvious at 360 °C. The doping level and substrate temperature have remarkable influence on sheet resistance, but little impact on visible transmittance. The optimal sheet resistance of 173 Ω/sq and average visible transmittance of above 80% can be achieved at doping level of 5 at% and growth temperature of 340 °C.
MEMS-Based Gas Chromatography Column for the Analysis of Chemical Warfare Agent (CWA) Simulates
Authors: Li Yi , Du Xiao Song , Wang Yang , Tai Hui Ling , Qiu Dong , Lin Qing Hao , Jiang Ya Dong
Published: December 2013

In this report the gas chromatography column was fabricated base on micro electro mechanical system (MEMS) technology. It tries to find an equilibrium point which can fast detect CWA stimulants with efficient column separation. Under deep reactive-ion etching (DRIE) process, a 1m length, 90 um thickness and 300 um height which form 3:1high-aspect-ratio, MEMS-based silicon GC column was fabricated. The GC column was coated with 95%Methyl 5% Phenyl Polysilozane (DB-5) as the stationary phase. Dimethyl methyl phosphonate (DMMP), Triethyl phosphate (TEP) and Methy salicylate were used for CWA simulations. All of these three samples can be separated less than 90s with reasonable column efficiency.
Influence of TMGa Flux on the Improvement of GaN Films on Thick Freestanding Diamond Films
Authors: Cui Shan Lin , Gang Hong , Li Zheng Nian
Published: December 2013

High-quality GaN films are deposited on diamond films using an electron cyclotron resonance plasma enhanced metal organic chemical vapor deposition (ECR-PEMOCVD) under the condition of the proper Trimethyl gallium (TMGa) flux. The influence of TMGa flux on the properties of GaN films is systematically investigated by x-ray diffraction analysis (XRD) and atomic force microscopy (AFM). The results show that the high quality GaN films with small surface roughness and high c-orientation are successfully achieved at the optimized flux. The most significant improvements in morphological and structural properties of GaN films are obtained by using a proper TMGa flux
Preparation of Y-Ti Bioxides Strengthened Fe-Cr Alloy by Mechanical Milling and Hot Pressing
Authors: Dai Lei , Feng Ping , Huang Cai Hua , Zhao Guang Wei
Published: December 2013

Oxide-dispersion-strengthened (ODS) ferritic alloys are fascinating materials for future fusion power reactors due to these materials would allow a substantial increase of the operating temperature. Y-Ti bioxides strengthened Fe-Cr alloy was produced by mechanical milling (MM) followed by hot pressing (HP). Microstructure changes of the mixed powders during mechanical milling and subsequent hot pressing were structurally characterized by means of scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The observations of structure of the mixed powders after MM indicated that the powders are fractured and welded with rotation and vibration of container during mechanical milling. And the particle size decreases with increasing milling time. Nanoscale Y-Ti bioxides were formed during the HP process.
A New Application of a Biological Nanomaterial on Raditional Protection and Radiation-Injuried Remediation
Authors: Yuan Yuan
Published: December 2013

Nuclear energy, due to having rich savings, great power, and less air pollution, gradually uses in civilian life widely. However, when this new energy is booming, some serious problems has appeared,such as radiation damage, the pollution of radioactive wastewater.etc .So how to make an effective protection and remediation to radiation injury has become a hot spot around the world. Here we will resport the relationship between a biological nanomaterials --Mollusk shell and the nuclear radiation, and we find that Mollusk shell not only can adsorb radionuclides, but also can repair the radiation injuries.This new function may contrubute to the design and synthesis of new radiation resistant materials.
Fighting Fires of Carbon Dioxide in the Closed Buildings
Authors: Sharovarnikov Alexander F. , Korol’chenko Dmitriy A.
Published: December 2013

The relation of time of a fire suppression to the consumption (intensity of submission) carbon dioxide is investigated thus arrest value of temperature in model and speed of burn-out of a fire load.
Exact Numerical Procedure for the Binding Energy of Hydrogen Impurities in Quantum Dots with Parabolic Confinements
Authors: Abramov Arnold
Published: December 2013

In this paper we present exact numerical procedure to calculate the binding energy and wave function of impurity states in a quantum dot with parabolic confinement. The developed method allows control the accuracy of obtained results, as well as calculates the characteristics of not only ground state, but also of the excited states. Comparison of our results with data obtained by other methods is in quantitative and qualitative agreement. We studied the effects of impurity position on the binding energy.
Steady and Transient Properties of Side-Gated Nano-Transistors
Authors: Xu Kun Yuan , Wang Z.N. , Wang Y. N.
Published: December 2013

Using a two-dimensional ensemble Monte Carlo (EMC) method, the steady and transient properties of side-gated nanotransistors with single gate and double gate are studied in detail. Simulation results show that the double-gated nanotransistor has more powerful controlling ability on the channel than the single-gated one. The transient processes of the drain current for the two devices are both about 3 ps, which imply that the working speed of the two devices may reach about 0.3 THz. The detail of transient processes for the double-gated nanotransistor is trivial. But for the single-gated nanotransistor, the drain current response shows obviously oscillating during approaching the next steady state. The phenomenon of drain current oscillations is also discussed.
Structure Topology Optimization Design for Compression Box of Horizontal Preloading Domestic Waste Transfer Station
Authors: Zhou Hui , Li Gang Yan , Zhang Yuan , Li Le
Published: December 2013

Horizontal preloading domestic waste transfer station is the core equipment for domestic waste disposal. Compression equipment is the elementary equipment of horizontal preloading domestic waste transfer station, which should be ensured its mechanical properties and structural lightweight. According to the compression box structure in this paper, structural topology optimization model is established. By using HyperWorks software, the result of structural topology optimization result of compression box is obtained. Based on the result of topology optimization, the structural improvement design model of compression box is established, and the number, location, size of strengthening rib for bottom plate, top plate, side plate are optimal designed so as to realize structural lightweight.
Dynamic Modeling and Simulating Analysis of Submersible Buoy System
Authors: Qi Zhan Feng , Jia Li Juan , Qin Yu Feng , Zhang Sen , Sun Xiu Jun
Published: December 2013

The submersible buoy system is an important tool in the profile observation of marine environment. According to the lumped mass based method, the dynamic modeling of the submersible buoy system is established, then the dynamic analysis is carried out. The dynamic model is solved and analyzed by using the software MATLAB. The result provides theoretical reference for its structural design and numerical computation of the submersible buoy system.
Dynamic Response Modeling of Fluid-Solid Coupling for Wet Brake Disc
Authors: Zheng Xun Jia , Luo Tian Hong , Jia Ce
Published: December 2013

Due to the poor conditions of wet brake cooling and the high temperature of the working characteristics, this paper intended to introduce the oil film vadose between the brake linings, considered the variation of volume of grooves on the friction plate, and then proposes the three-dimensional transient dynamic response of fluid-solid coupling mathematical model. By numerical analysis of the disc transient thermal stress field distribution on the friction plate, the friction surface temperature field variation is obtained. Finally, the results shows that the mathematical model is effective and feasible.
Propagation Characteristic Analysis of Shaft-Rated Electromagnetic Field Produced by Ship of Multiple Propellers in Shallow Ocean
Authors: Liu De Hong , Wang Xiang Jun , Zhu Wu Bing , Ji Dou
Published: December 2013

In order to discuss the propagation characteristic of shaft-rated (SR) electromagnetic (EM) field produced by the ship of multiple propellers in shallow ocean, analytical expressions of EM was derived by several time-harmonic vertical dipoles model based on single time-harmonic vertical dipole method. Firstly, the paper built the physical model of single time-harmonic vertical dipole in triple-layer mediums with uniform speed movement. Then from two factors of phase and frequency, according to vector superposition principle, the EM expressions were solved by n time-harmonic vertical dipoles in fixed position so as to provide theoreticl law for the research of propagation characteristic. Some valuable conclusions were rearched through simulation, including finding the maxmum EM value when frequency was same and phase was zero, and frepuency variation was no-effect to the SR EM field when phase was same. Lastly, the exprement results were anatomotic with theoreticl analysis and demonstrated the effectiveness the expressions.
An Air Quality Monitoring System Based on Sensor Array and Framework of Cloud Computing
Authors: Song Zhi Li , Liu Yun Xiang , Yu Wan Jun
Published: December 2013

In this paper, an air quality monitoring system based on sensor array and framework of cloud computing is implemented. This system can surveil and report the information gathered from the ambient air condition in real time and inexpensive way, it can protect the public's right to know about the environmental security that everyone living in. All efforts and works of this paper is to turn the dreams into reality: to preserve and improve the quality of our living environment's air, in the sense of keep the damage to our health far away, through the strong pressure of public opinion.
A Survey on Shaft Voltage of Large Generator
Authors: Chen Ling , Wang Hong Hua , Wang Cheng Liang , Tan Chao
Published: December 2013

Shaft voltage is widely existed in the operation of generator and needed to pay more attentions. Based on the mechanism of generator shaft voltage, this paper analyses and expounds the harmfulness of shaft voltage and shaft current, then summarizes the prevention and control measures of shaft voltage and the research status. The direction of generator shaft voltage is prospected for further research.
The Simulation Study on Heat Dissipation of High Power LED Based on the Natural Convection
Authors: Zhong Yong , Fang Ting Yong , Zhang Tao Lin
Published: December 2013

In this paper, we studied on the heat dissipation of high power LED in numerical simulation by the large eddy simulation numerical methods with the simulation software FDS, and studied the temperature distribution and heat pipe cooling respectively, etc.. We did the numerical simulation research on the heat dissipation of high power LED fin by numerical simulation, and obtained the numerical solution of all the LED temperature field and flow field. The air flow rate near the radiating surface was low; the fin surface temperature distribution was basic uniform and closed to the temperature of the constant heat reservoir. The analysis of the results of numerical simulation provided references for the improvement of optimal design of LED radiator.
Design of Combine Harvester Chassis Weld Deformation Prediction System Based on Virtual Instrument
Authors: Zhang Ya Wei , Chen Du , Wang Shu Mao , Zheng Yong Jun
Published: December 2013

To promote the detection efficiency of combine harvester chassis frame welding deformation, a weld deformation detection system was coming up in this paper to automatically detect the weld deformation of combine harvester chassis frame. The system assessed weld deformation according to flatness and parallelism of the specific plane of combine harvester chassis frame. Two high-precision laser sensors were mounted on broadside of a gantry to measure the parallelism of the chassis frame, and another two laser sensors were mounted on top of the gantry to measure the flatness of the chassis frame. The analogue signal from the laser sensors was collected by a data acquisition instrument. Two step motors were mounted on a liner guide placed at bottom of the gantry to drive the chassis frame to specific measurement positions. A software developed by LabWindows/CVI@ accomplished human interaction besides of controlling the step motors, reading the laser sensors via data acquisition instrument, and displaying the flatness and parallelism. A serial of testing showed the system could measure the flatness and parallelism of the chassis frame automatically, and meet the needs of combine harvester chassis frame weld deformation prediction.
Strain Measurement for Sheet Metal Forming Based on Close Range Photogrammetry
Authors: Li Da Cheng , Liang Jin , Hu Hao , Tang Zheng Zong , Guo Xiang , Li Lei Gang
Published: December 2013

To improve efficiency and automation of the 3D full-field surface strain measurement for sheet metal forming, a new grid strain measuring scheme was developed based on the close-range photogrammetry technology. A Local Canny Detector algorithm was proposed for grid nodes and coded targets detection. A 10-parameters nonlinear camera model and the bundle adjustment algorithm were used to optimize the calibration parameters. A multi-epipolar constraint method was employed for grid node matching. Finally, the surface strains were calculated according to the changes of the grid sizes. To evaluate the performance of the proposed scheme, a stamping forming experiment was conducted. Experimental results show that the scheme can provide a non-contact, intuitive and effective solution for strain measurement in sheet metal forming process.