bluuebunny/crossref_metadata_2025 huggingface dataset:
Optical OFDM for Downstream Transmission in Long-Reach PON
Authors: Gong Xiao Xue , Li Hui , Han Peng Chao , Zhou Yu Fang
Published: September 2014

Orthogonal Frequency Division Multiplexing (OFDM) has gained great attention in the next generation Long-Reach Passive Optical Network (LR-PON) due to its high spectrum efficiency, flexible resource allocation and natural compatibility with Digital Signal Processing (DSP)-based implementation. In this paper, we propose and demonstrate a 40Gbit/s direct-detection long reach OFDM-PON system for downstream transmission over 100km standard signal mode fiber (SSMF). By using a simple Least Square (LS) method for the channel estimation, our proposed system achieves high bit rate without the need for chromatic dispersion compensation.
Plan of Power Communication Network Based on Smart Grid Services
Authors: Fan Wei Lin , Ma Ping , Gao Qiang
Published: September 2014

Based on available data and predictions of power distribution and utilization communication services in smart grid of a realistic province, a plan for power communication network is proposed. For access network, communication strategies are explored based on load density of different power supply areas. As for transport network, architecture of trunk and local network is designed and its feasibility is discussed in terms of bandwidth utilization and network survivability.
An Efficient Mobile User Authentication Scheme with User Anonymity for Wireless Communications
Authors: Li Wei Jing , Zhu Ping , Zhang Hua , Jin Zheng Ping
Published: September 2014

Recently, many mobile user authentication schemes with user anonymity for wireless communications have been proposed. In 2012, Li and Lee proposed a novel user authentication and privacy preserving scheme with smart cards for wireless communications. In 2013, Jeon et al. proposed an improved user authentication scheme, and claimed their scheme achieves user anonymity and more efficient. On the basis of their work, we put forward a new user authentication scheme using elliptic curve cryptography with user anonymity for wireless communications. The security and performance analysis show that the new scheme is more secure and efficient for wireless communications.
Design and Implementation of a Fast Algorithm for File Integrity Verification
Authors: Li Ting Ting , Jiao Rui Li
Published: September 2014

At present, MD5 algorithm is commonly used in the file transfer system to conduct the tests of file integrity, but when a file is too large, it will take a long time to generate MD5 code for the whole file, with the result of reducing the transmission efficiency of the file. Based on this conduction, a fast algorithm of file integrity detection is provided, which can generate MD5 code with the file size and some random content of the file. Although the algorithm cannot test files roundly, it is integrated into the file transfer system. The test results show that this algorithm can detect the file integrity faster, and when the file is damaged or tampered with, the probability of detecting changes of the file content is higher than the theoretical value. The algorithm has great value in engineering applications.
Economics of Information Security Investment Integrated with IDS and Attacker’s Behavior
Authors: Ye Ru Yi , Jiang Zhou , Wang Qi
Published: September 2014

ROSI (Return On Security Investment) has attracted a great deal of attention in recent years. By inheriting Gordon and Loeb 2002 security breach probability function, we present an adaptive economics model of investment in information security integrating dynamic characteristics of outside threat probability and detective mechanism, and deduce some guidelines for optimal investment amount.
A SVM QoS Estimation Model for the Component-Based Software System
Authors: Nie Peng
Published: September 2014

More software application are intend to be developed by the automated code synthesis or the component integration. We proposed a SVM QoS estimation model for the component-based software system (SVMQEM). Our estimation model learns various system QoS properties and outputs a comprehensive QoS by SVM, which is different from the approaches available in the literature. The experiments shows that the SVMQEM has an acceptable QoS estimation accuracy for the component-based software system.
An Android Application of Evaluation Constitution in Traditional Chinese Medicine
Authors: Li Zhi Biao , Du Jian Qiang
Published: September 2014

In this paper, an Android application of evaluation constitution in traditional Chinese medicine is introduced for constitution evaluation and health preserving. According to requirements, the application consists of six modules including constitution type, evaluation, records, proposals, health preserving book and health preserving proposals. With the application based on Android, constitution evaluation becomes more conveniently. Moreover, health preserving proposals provide an effective method to maintain a healthy body for users with abnormal constitution.
Design and Implement of Teaching Resources Management Network Platform Based on MVC
Authors: Zhang Jian Jun , Pu Xiang Hua , Zhang Zi Hui
Published: September 2014

Now the popular Struts+Spring+Hibernate framework provides a weak coupling, easily containable, lightweight J2EE software development model which helps to build high-quality Web applications. Through researching of SSH framework and ExtJS framework based on AJAX technology, an integration framework is designed, which is based on ExtJS+SSH ,and can be used to build a flexible, easily extended and maintainable multi-tier Web application platforms. In this paper, a teaching resource management network platform is introduced, which is based on the integration framework. Experimental results show that business operations, the database, and display will be divided completely by using this integration framework based on ExtJS and SSH, in order to achieve a system of weak coupling and high level of maintenance.
On Algebraic Immunity of Weight Symmetric H Boolean Functions
Authors: Huang Jing Lian , Wang Zhuo , Li Juan
Published: September 2014

Using the derivative of Boolean functions and the e-derivative defined by ourselves as research tools, we discuss the relationship among a variety of cryptographic properties of the weight symmetric H Boolean functions in the range of the weight with the existence of H Boolean functions. We also study algebraic immunity and correlation immunity of the weight symmetric H Boolean functions and the balanced H Boolean functions. We obtain that the weight symmetric H Boolean function should have the same algebraic immunity, correlation immunity, propagation degree and nonlinearity. Besides, we determine that there exist several kinds of H Boolean functions with resilient, algebraic immunity and optimal algebraic immunity. The above results not only provide a theoretical basis for reducing nearly half of workload when studying the cryptographic properties of H Boolean function, but also provide a new research method for the study of secure cryptographic property of Boolean functions. Such researches are important in cryptographic primitive designs.
Infrasonic Signal Observation through the Monitoring Network
Authors: Zhao Juan , Hao Guo Cheng , Zeng Zuo Xun
Published: September 2014

The methods of observing and processing infrasonic signals from earthquake sources are discussed in this paper. The categories of earthquake infrasound are firstly discussed. Spectrum analysis as well as travel speed calculation are used to distinguish high frequency local infrasound from the acoustic-gravity wave. Monitoring network has been established to capture the signals from the atmosphere. Basing on a simplified correlation method, a triangle array made of three sensors can decide the direction of the coming signal, and locate the earthquake sources. The calculation error and steps of further improvement are also discussed at the end of the paper.
Application of Computer System Based on Artificial Neural Network and Artificial Intelligence in Diagnosing Child Attention Deficit/Hyperactivity Disorder (AD/HD)
Authors: Zhao A Meng , Wang Yu Hua , Wang Na , Kang Lu , Zhu Shuang Yue
Published: September 2014

This paper used computer to simulate thinking modes of human brain, to establish an artificial intelligence expert system for diagnosis and treatment of child AD/HD based on artificial neural network. The diagnosis system involves expert knowledge database, artificial neural network and the relational database. The clinical data were obtained from 10 epidemiological and outpatient department, and 1125 valid data were harvested for the system compilation. The diagnosis of 627 cases adopting the man-machine double-blind controlled trial, the Kappa value was 0.98 (P < 0.001). The research can help junior clinicians to learn abundant clinical experiences of senior child psychiatrists, and can help children of AD/HD throughout the country.
Simulation on Injury to Driver under Car Front Crash Condition
Authors: Jiao Zhi Yong , Li Jun Jie
Published: September 2014

To study the injury index to driver in front crash, this article uses the MADYMO software to establish the driver constraint system model which including car bodies, safety belts and 50% dummy for impact simulation. The simulation values are close to test ones after contrasted with the vehicle impact test. The influence of design parameters including the D-ring friction coefficient of seat belt, airbag strap and steering column on driver HIC, T3MS, THPC are researched by this model. The results show that: The smaller D-ring friction and a longer airbag strap length and steering column crushing can effectively improve the driver safety.
Optimal Robust Design of Multiple Response Problems of Compliant Mechanism Based on the Response Surface Methodology
Authors: Wu Jian Jun , Wu Shi Lang , You Xiong Xiong
Published: September 2014

Optimal robust design for multiple response problems is becoming more important for compliant mechanism. However, there are now still need effective methods for complex multiple response problems in the design process of compliant mechanism. In this paper, through the Response Surface Methodology (RSM), a novel optimal robust design method for the flexibility relationships of the 3-RRR compliant parallel micromotion platform along the X、Y direction and the rotation around the Z axis is proposed. Analysed the influence of different size parameters of flexible hinge to the compliant parallel micromotion platform different direction flexibility, the optimized complex multiple response variables of the compliant parallel micromotion platform and the best robust solutions are developed. And a real case study is used to demonstrate the implementation and potential applications of the proposed method for optimization design of compliant mechanism with considering complex multiple response problems.
Simulation Reach of Permanent Magnet Synchronous Motor System Based on Speed Sensor-Less Direct Torque Control
Authors: Chen Meng Yuan , Chen Yue Dong
Published: September 2014

The simulation model of permanent magnet synchronous motor system based on speed sensor-less direct torque control is built by analysing the mathematic model of permanent magnet synchronous motor and the theory of direct torque control in this dissertation, and the system’s speed and position is estimated by calculating the angle of stator flux linkage. MATLAB/Simulink is utilized to simulate the system, and the simulation results are analyzed, with which the simulation result prove the correctness and feasibility of the estimation using in this dissertation and good dynamic response performance of the system.
A Heuristic Algorithm for Flow Shop Scheduling Problem
Authors: Yuan Hua Wei , Jing Yuan Wei , Ren Tao
Published: September 2014

This paper considers the m-machine flow shop problem to minimize weighted completion time. A heuristic algorithm is presented to deal with the problem for large size problem. At the end of the paper, some numerical experiments show the effectiveness of the heuristic.
Force Requirements in Shear Cutting of Metal-Polymer-Metal Composites
Authors: Übelacker David , Hohmann Johannes , Groche Peter
Published: September 2014

New approaches in lightweight design require the use of multi materials like metalpolymermetal composites. Composite materials, especially so-called sandwich panels, offer the possibility to combine properties of different materials synergistically. Shear cutting is one of the commonly used manufacturing processes. However, conventional shear cutting of sandwich panels leads to characteristic types of failure, such as high bending of the facings, delamination effects, burr formation and an undefined cracking of the core material. In the present research, the cutting force requirement and the failure progress for lubricant free shear cutting of metal-polymer-metal composites is studied. Two thermoplastic polymers, an aluminum sheet and an unalloyed steel sheet are combined in order to create different composite materials. Furthermore, the composite materials are cut stepwise to examine the different stages of a cutting process in detail.
Composite Hot Extrusion of Functional Elements
Authors: Schwane Martin , Dahnke Christoph , Haase Matthias , Ben Khalifa Nooman , Tekkaya A. Erman
Published: September 2014

The composite extrusion process, which is investigated at the Institute of Forming Technology and Lightweight Construction (IUL), allows the combination of different materials within an aluminum profile. In contrast to the useage of reinforcing elements, this paper focuses on the embedding of functional elements, such as isolated electric conductors. Results of the experimental and numerical investigations are presented within this paper.
Development of a Pneumatic Bulge Test for High Temperatures and Controlled Strain Rates
Authors: Braun Alexander , Storz Johannes , Bambach Markus , Hirt Gerhard
Published: September 2014

Due to new material concepts (e.g. boron-manganese steels), hot stamping of sheet metal parts has emerged in order to produce high strength components. Thereby, the design of hot stamping processes by means of finite element simulations requires information about the thermo-mechanical material behaviour up to high strain levels at various temperatures as simulation input. It is known that hot tensile tests are only evaluable until low strain levels. Therefore, a hot gas bulge test for temperatures in the range of 600 °C to 900 °C and strain rates up to 1/s is being developed. In order to design such a hot gas bulge test, the requirements (e.g. forming pressure) are estimated by finite element simulations. The result is a test bench, which already enables a pneumatic forming of specimens at room temperature and pressures up to 200 bar without any unexpected side effects.
Influence of Manufacturing Process on the Fatigue Strength of Gears
Authors: Reiß Andrea , Engel Ulf
Published: September 2014

With cold forging processes it is possible to produce parts characterized by high strength, high dimensional accuracy and high surface quality. In order to optimize the forming process and to be able to use the advantages of cold forging specifically and combined, it is necessary to find correlations between manufacturing parameters on the one side, strength and other properties like hardness distribution and surface quality of the component on the other side. The research work covered in this paper focuses on the correlation of the components properties influenced by its manufacturing history and their fatigue strength. The used component is a gear produced by a lateral cold forging process. For the investigations an experimental setup has been designed. The aim for the design of the setup is to reproduce the real contact condition for the contact of two gears. To obtain different component properties the production process of the gear was varied by producing the parts by a milling operation. First of all, the components’ properties, for example hardness distribution, remaining residual stresses, orientation of fibers and surface quality, were determined. The components’ fatigue behavior was determined using a high frequency pulsator and evaluated in terms of finite life fatigue strength and fatigue endurance limit. These examinations were used to produce Woehler curves for the differently manufactured components with a certain statistical data analysis method.
Process Chains for Fibre Metal Laminates
Authors: Neugebauer Reimund , Kräusel Verena , Graf Alexander
Published: September 2014

The combination of fibre-reinforced materials with metals is defined as a fibre metal laminate. These material composites have already been a subject of research for several years. The long manufacturing time resulting from the period required for consolidation of the thermosetting resin is a major disadvantage of the fibre metal laminates previously in use (for instance GLARE, which is a combination of aluminium with glass fibre-reinforced plastic). In this paper, a new fibre metal laminate with a thermoplastic resin in the carbon fibre-reinforced plastics (CFRP) is introduced. The application of a thermoplastic resin system results in a general change in the process chain. The cutting of fibre metal laminates by means of the flexible water jet and laser cutting techniques is presented. In the second operation, forming behaviour is represented by the methods of v-bending and deep drawing. Finally, quality assurance by means of computed tomography, which replaces the conventional metallographic method, is described.
Bending of Tailored Blanks Using Elastic Tools
Authors: Weinrich Andres , Becker Christoph , Maevus Frauke , Chatti Sami , Tekkaya A. Erman
Published: September 2014

Tailored blanks are suitable for the manufacture of lightweight structures due to the load-optimised design. However, the forming of tailored blanks is problematic because of the varying properties. Especially springback is a main challenge to focus on. An innovative process will be discussed which concentrates on the air bending process of sheet metal extended by a local application of a stress superposition to reduce springback.
Square Foot Manufacturing - Concept and Design of an Electrorheological Inchworm Feed Drive
Authors: Breitfeld Andreas , Freyer Holger , Conflant Pierre
Published: September 2014

This scientific contribution presents a novel concept and design of a hydraulic inchworm feed drive based on an electrorheological suspension. This feed drive is ought to power Micro Machining Units (MMU) of Square Foot Manufacturing (SFM) modules. The transfer of energy is conducted by an electrorheological suspension, a field-responsive fluid that allows the use of small, rugged and simple micro valves. Both of the presented feed drive’s prototypes comprise electrorheological micro valves as primary actuators and flexible metal bellows as secondary actuators in two configurations. The combination of electrorheological micro valves with flexible metal bellows allows a very compact and sealed design that avoids dynamic seals and therefore leakages making the electrorheological inchworm feed drive suitable for a wide spectrum of motion solution including clean room applications.
Identification and Improvement of Communication in Factories
Authors: Tschöpe Sebastian , Reinema Christian
Published: September 2014

In this article you find the results of the research project "Modelling and design of dynamic business and communication processes in the factory” which is funded by the German Research Foundation (DFG). The main result is a methodology for the identification and improvement of communication in factories, which consists of the three models: descriptive model, evaluation model, procedure model. The descriptive model is based on the method of matrix modelling and enables the depiction of communication structures. The evaluation model is conductive to the assessment of communication circumstances in the factory and the procedure model explains the course of action necessary for the practical use of the descriptive and evaluation model. According to the developed methodology the three models were implemented in an EXCEL-based software-tool which enables the practical use of the methodology. The software-tool provides a possibility to not only describe the communication structure of factories, but also to identify communication processes necessary to run the factory. Moreover it is possible to detect inadequacies of communication circumstances and derive measures to adjust them appropriately. In the following article the methodology and the software-tool are described in detail. For an optimal comprehension of the methodology each of the three models is detailed. In order to obtain an idea of how the software-tool works and how it looks like, its three components are explained.
Dimensional In Situ Shape and Surface Inspection of Metallic Micro Components in Micro Bulk Manufacturing
Authors: Weimer Daniel , Huferath von Luepke Silke , Tausendfreund Andreas , Bergmann Ralf B. , Goch Gert , Scholz-Reiter Bernd
Published: September 2014

A rising trend to miniaturization and function integration requires new materials, tools, manufacturing setups and quality inspection strategies for mass production of micro mechanical systems (MMS). In most scenarios, quality inspection is carried out manually. An expert takes samples out of the manufacturing process and investigates them by means of tactile or optical measurement systems. This time consuming quality inspection process leads to low inspection rates, especially in bulk manufacturing processes, where manufacturing frequencies of 400 parts per minute are common. This contribution introduces an automated optical quality inspection method based on a digital holographic system, which acquires 2D texture and 3D shape information in one single measurement step. Based on 3D data, an automated point separation algorithm splits the measured object shape into elementary geometries and calculates form and position deviations compared to an object model. In the final step, a 2D surface inspection procedure based on multi-scale texture analysis detects surface defects with respect to the separated elementary geometries and fuses the result from the 3D shape and the 2D texture analysis to a final rejection decision. The capability of the proposed quality inspection method is demonstrated in a micro cold forming scenario, where a micro cup smaller than 1 mm in all geometric dimensions is the object under investigation.
Simulation-Based Sequencing Algorithm for MRO Operations of Train Couplings
Authors: Georgiadis Alexander
Published: September 2014

Sequencing rules are often used in production control to improve key performance indicators, such as cycle time, mean tardiness and on-time delivery. However, for Maintenance, Repair and Overhaul (MRO) processes, there is a development need for sequencing rules, which effectively improve these indicators since specific requirements have to be considered and recent studies have mainly been using standard rules and do not allow a clear conclusion. This paper describes the modeling and validation of a real-case scenario, the MRO of train couplings by means of an event-driven simulation. The simulation model is used in order to derive and test a new sequencing rule, the Fix-and-continue algorithm (FACA), as well as to compare its results with standard sequencing rules concerning average cycle time, mean tardiness and on-time delivery. Thereby, the potential of the algorithm is revealed.
Advanced Machining Processes for CFRP
Authors: Rieck Iris , Uhlmann Eckhart
Published: September 2014

The processing of fiber reinforced plastics is one of the main research areas at the Institute for Machine Tool and Factory Management of the Technical University of Berlin. In this process new tool concepts and innovative process strategies are developed, tested and prepared for the industrial application. This report presents the latest research results in the field of High-Speed-Cutting of fiber-reinforced plastics.
The Determination of Frost Resistance on Ultra High Performance Concrete
Authors: Kostelecká Michaela , Kolisko Jiří
Published: September 2014

The ultra high performance concrete (UHPC) has very special properties that are expressively different of normal concrete. Due to its high compression strength greater than 150 MPa, tensile strength greater than 20 MPa and improved durability, these represent significant advances in concrete technology. These materials include Portland cement, silica fume, quartz flour, fine silica sand, high-range water-reducer, water and either steel or organic fibres. Depending on the type of fibres used can influence the compressive strength. The article describes the tests of frost resistance on UHPC plates with different types of textiles armatures. The aim of the testing is describe influence of textiles armatures in UHPC matrix in extreme conditions.
Diversity Measurement of Fuel Cell Field Using Patent Information
Authors: Jeong Dae Hyun , Kwon Young Il
Published: September 2014

Fuel cells having a high energy conversion efficiency with low restriction of installation space is rising as a new eco-friendly renewable energy source. Fuel cells are largely divided into MCFC, SOFC, PEMFC, DMFC, etc. according to the type to be transferred. In this study the four fields were analyzed from a diversity aspect, a social network aspect and a distance aspect. Results showed PEMFC and MCFC to apply the most diverse technology, and catalyst technology and hydrogen fuel manufacturing areas were observed developing in all four fields. In addition, many studies were found to be commonly conducted for fuel cell vehicles in the PEMFC and SOFC fields. PEMFC is expected to have the highest effect with technology development, specifically commercialization of the Fuel Cell Vehicles through an active technology development. Development in the SOFC and MCFC fields are expected to promote home fuel cell use.
Analysis of CO2 Emission in the Waste Disposal Process Based on Computation of Construction Waste
Authors: Bok Young Jin , Tae Sung Ho , Kim Rakh Yun
Published: September 2014

The purpose of this study is to analyze CO2 emission based on computation of construction waste which occurs during new constructions. To accomplish the purpose, Basic unit data of existing construction wastes was analyzed and basic unit of construction wastes generated during new constructions was proposed. In addition, basic unit of CO2 in the disposal process of construction waste established as the national LCI DB of Korea was applied to analyze CO2 emission during the disposal process of waste (landfill, incineration, recycling) generated during new constructions. As a result, flammable materials showed relatively high emission of 17.75kg-CO2/kg and 2.40kg-CO2/kg for the landfill process and recycling process, and inflammable materials had high emission of 0.74kg-CO2/kg for the incineration process. As a result of analysis for each waste, emission was found to be in decreasing order of landfill and recycling processes for concrete, recycling, landfill and incineration processes for metals, incineration, recycling and landfill processes for wood and flammable materials, and landfill, recycling and incineration processes for inflammable materials.
Product Data Management Systems as a Tool in Engineering Change Management
Authors: Huhtala Merja , Lohtander Mika , Varis Juha
Published: September 2014

Engineering change management (ECM) affect to cost that are generated during the designing and manufacturing process. ECM also affects to the time how fast the product is on market. The changes have to be made quickly and the notifications of the changes have to reach the person who may need the information. Product Data Management (PDM) is the system which is not only storage place for the data; it is a tool which should make ECs faster and more effective. This paper deals with the techniques that are in use to handle the ECs with the help of PDM system.
Modeling Interior Environment of Historical Building and Determination of Critical Places for Application of Nanotextiles Protection
Authors: Souček Jiří , Tichá Petra
Published: September 2014

Reconstruction of internal plaster in historical buildings belongs to significant and obvious treatment in a landmark area that helps protect irreplaceable cultural resources. Original form of historical buildings has been usually altered over time and alterations are an important part of the building's history. These interventions don ́t often respect the basic function of interior. Results of these changes cause plaster and painting decay, slow air flow and higher air moisture concentration. Computer simulation plays major role in determining places where is necessary to apply surface protection that will preserve the valuable interior surface against negative influences such as high level of moisture, fungus, chemical reactions etc. Abatement of negative influences within historic buildings requires particular care if important historic finishes are not to be adversely affected. Reconstruction of historical interiors should be designed to minimize visual changes to a historic building. Choosing the most appropriate treatment for a historical building requires careful decision making about using of appropriate material for renovation. Using of nanofibers should be minimal modifications to the historic appearance and protect from negative influences.
Study on the Performance of an Open Loop Cycle CO2 Refrigeration System in the Extreme Limit Condition
Authors: Xu Lei , Jiang Yan Long , Zhou Nian Yong , Li Jun
Published: September 2014

As a result of the strict restrictions on the use of power supply under the mine disaster, the Open loop cycle CO2 refrigeration system is used in the Mine Rescue Cabin. Traditional system have got a couple of equipment malfunctions frequently, such as the Ice-block in Cold-start, Cold-frost and Overheating. In this paper, a new type of refrigeration system is designed after the Thermodynamic analysis of extreme limit condition. The new system avoids the Ice-block and the cold-frost by limit the refrigerant flow, it also can improve the capability of the evaporator. It has a important reference value to the research and application of the open loop cycle CO2 refrigeration system in the extreme condition.
Temperature Prediction at the Blow End of the Converter via Control Model
Authors: Ferreira Alexandre Furtado
Published: September 2014

In the present work, a technique and model for temperature prediction at the blow end are briefly discussed, along with their limitations and perspectives for application. As a result of this analysis, a mathematical model based in heat and mass balances has been developed with a view to evaluating the possibility of improving this prediction capability. The study here presented focuses the development of a semi-dynamic control model in the LD-KGC converter (Linz-Donawitz-Kawasaki Gas Control Converter). The control model enables one to predict the temperature of the blow end by solving both the energy and mass equations. The inputs to the control model are the load data of the LD-KGC converter at the blow beginning and the collected data by the lance to 89% of oxygen blow. The results obtained in the present work were compared to the data measured in steelmaking. The semi-dynamic control model results agree well with data for LD-KGC converters.
Particleboard Manufactured with Additions of Eucalyptus Bark in Different Percentages in the Internal Layer
Authors: de Campos Cristiane Inácio , Ferreira Bruno Santos , Barbosa Juliana Cortez , Morales Elen Aparecida Martines , Christoforo André Luis , Rocco Lahr Francisco Antonio
Published: September 2014

This study aimed to produce and determine physical and mechanical properties of three layers particleboards produced with Eucalyptus sp. particles, in outer layers, and Eucalyptus urograndis e Eucalyptus saligna bark, in internal layer. Recommendations of the Brazilian Code ABNT NBR 14810-3:2006 were adopted to fundament physical and mechanical tests. Properties considered were modulus of rupture (MOR) and modulus of elasticity (MOE) in static bending; internal adhesion; thickness swelling; water absorption; moisture content and density of the panels. Four different panel compositions were studied, with 5, 10, 15 and 20% of bark (related to particle mass) the internal layer. Results were compared with the requirements of: Brazilian Code ABNT NBR 14810-2; European Code EN 312 and related literature. The produced panels were adequate to all the values stipulated the cited codes and also superior to similar studies found in the literature, for all compositions of bark in internal layer, except for the moisture content test, in which only the composition of 5 % hull met the normative specifications.
Stacking Design of Composite Laminate in Wheelchair Structure under Seat Loading
Authors: Liu Thomas Jin Chee , Liang Jin Wei , Chen Wei Long , Chen Teng Hui
Published: September 2014

For designing the wheelchair structure under the seat loading, the stresses and failure indexes in each ply of the composite laminate are obtained by the finite element analysis. Using the Tsai-Wu criterion and delamination criterion, the stacking sequence [04/904/454/-45]s is the final optimal design for the wheelchair frame. On the contrary, the uni-directional laminates, i.e. [9013] s, [4513] s and [-4513] s, are bad designs.
Frequency and Temperature Dependence of Dielectric Properties of Orthorhombic HoMnO3 Thin Films
Authors: Gao Ping , Zhang Wei , Wang Wei Tian
Published: September 2014

Orthorhombic HoMnO3 films were prepared epitaxially on Nb-doped SrTiO3 single crystal substrates by using pulsed laser deposition technique. The films showed perfectly a-axis crystallographic orientations. X-ray diffraction and atomic force microscopy were used to characterize the films. The complex dielectric properties were measured as functions of frequency (40 Hz~1 MHz) and temperature (80 K~300 K) with a signal amplitude of 50 mv. The respective dielectric relaxation peaks shifted to higher frequency as the measuring temperature increased, with the same development of real part of the complex permittivity. The cole-cole diagram was obtained according to the Debye model, and the effects of relaxation process were discussed.
New Nickel Based Superalloys Development by Vacuum Arc Melting Process Based on Aluminum Addition of GTD-111
Authors: Polsilapa Sureerat , Wangyao Panyawat , Boonpou Pichayakit , Promboobpa Aimamon , Pongsugitwat Suvanchai
Published: September 2014

This research objective is to study the microstructural modification by Al additions in cast nickel base superalloy, GTD-111 by means of vacuum arc melting process. The Al additions to the alloy were 1, 2 and 3% by weight. After that, all casted specimens were performed with different reheat treatment conditions, which consist of solutioning temperatures of 1125°C, 1145°C, 1165°C, 1185°C and 1205°C, respectively, for 6 hours following with precipitation aging at 845°C for 24 hours. After all reheat treatments, the microstructures were investigated and analyzed by SEM. From all obtained results, it was founded that the specimens with Al additions for 1-2%wt. following with reheat treatment show the decrease in size of γ’ precipitated particles when increasing solutioning temperatures. 3%wt. of Al addition was too high content resulting in already improper microstructural characteristics. However all obtained data of area fractions of precipitate phase were almost the same. Effect of Al addition and solutioning temperature did not provide any significant effect in this case. The mechanical property behavior: hardness was investigated by using Vickers hardness tester. It was found that the hardness all was very similar and increased with higher solutioning temperatures.
Influence of Storage Period of Pieces in Stiffness of Pinus elliottii Glulam Beams
Authors: Christoforo André Luis , Rocco Lahr Francisco Antonio , Chahud Eduardo , Branco Luiz A. Melgaço N. , Battistelle Rosane A.G. , Valarelli Ivaldo D.
Published: September 2014

This study aimed to investigate the influence of storage time (0, 48 hours) of Pinus elliottii pieces and the tests to obtaining modulus of elasticity (static bending and transversal vibration) in glued laminated timber beams, produced with resorcinol based adhesive and 0.8 MPa compaction pressure. After pieces were properly prepared, part of them was used in immediate three manufacturing glulam beams, tested after adhesive cure, and part stored for 48 hours under a roof with a temperature of 25°C and relative humidity of 60% for subsequent manufacturing and testing three other glulam beams. Results of analysis of variance (ANOVA) revealed that the storage period was significant influence in modulus of elasticity obtained in static bending test (8% reduction from 0 to 48 hours). This not occurred with modulus of elasticity obtained by transversal vibration test (no significant influence). ANOVA results showed equivalence of means in both test procedures. New researches ire needed to better understand the investigated phenomenon, using new wood species, other storage conditions and a great number of samples.
Anti-Corrosive Performances of Environmental Friendly Materials on Al-Mg-Si Alloy
Authors: Rosliza R. , Wan Nik Wan B. , Izman S.
Published: September 2014

The anti-corrosive performances of aluminum and its alloys is the subject of considerable technological importance due to the increased industrial applications of these materials. This paper reports the results of the linear polarization (LP) and electrochemical impedance spectroscopy (EIS) measurements on the corrosion inhibition of Al-Mg-Si alloy in seawater using natural products (natural honey, vanillin and tapioca starch) as an inhibitor. The results show that the anti-corrosive performances increases with the increasing of natural products concentration. The energy dispersive spectrometer (EDS) studies elucidated that the breakdowns of Al2O3 after exposed to seawater decreased with the presence of natural products. In all cases, the anti-corrosive performances can be given in the following increasing order: Natural honey < Vanillin < Tapioca starch.
Ocimum americanum L. Essential Oil Exhibits Antimicrobial Activity Against Oral Bacteria Related to Periodontal Disease
Authors: Thaweboon Sroisiri , Thaweboon Boonyanit
Published: September 2014

The aim of this study was to evaluate the antimicrobial property of essential oil extracted from the leaves of Ocimum americanum against oral bacteria related to periodontal disease. Three species of periodontal pathogens including Porphyromonas gingivalis W50, Prevotella intermedia ATCC 25611 and Fusobacterium nucleatum ATCC 25586 were included in the study. Agar diffusion was performed initially to screen the antimicrobial activity of O. americanum essential oil. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were then determined using the Millipore Membrane method. The result showed that in the agar diffusion, essential oil extracted from Ocimum americanum exhibited antimicrobial activity against all test bacteria with the zone of inhibition ranging from 24 to 30 mm. The MIC values against P. gingivalis and P. intermedia were 0.35 mg/mL whereas that of F. nucleatum was 0.70 mg/mL. The MBC values against P. gingivalis and P. intermedia were 0.70 mg/mL whereas that of F. nucleatum was 1.4 mg/mL. In conclusion, O. americanum essential oil has an antimicrobial activity which may be a beneficial component of oral health care products to control or prevent periodontal disease by reducing these bacteria in the oral cavity.
Lamellar Liquid Crystalline Materials Modulated by 1-Ethyl-3-Methylimidazolium Hexafluorophosphate
Authors: Zhang Guo Dong , Zhuang Wen Chang , Tian Jing , Zhang Chang Cheng , Zhang Long Li , Lin Xu Feng
Published: September 2014

Liquid crystal was formed in a ternary system of tetraethylene glycol lauryl ether, water and 1-ethyl-3-methylimidazolium hexafluorophosphate. Its structure was identified by polarized optical microscopy and small-angle X-ray scattering techniques. Compared to that in the binary system, lamellar phase was retained with the addition of a small amount of imidazolium salt. Molecules of 1-ethyl-3-methylimidazolium hexafluorophosphate were considered to be solubilized in the polar domain of the ordered assemblies. Results on their influence on the lamellar phase enlighten the use of imidazolium salts to modulate liquid crystalline materials and other assemblies.
Development of Effective Technique for Irradiating Samples of Thin Films Using the Focused Ion Beam
Authors: Kotvitckii Aleksandr , Dubinetc Aleksandr , Ermaov Konstantin , Modin Evgeny B. , Pustovalov Evgeny Vladislavovich , Plotnikov Vladimir S.
Published: September 2014

In this paper, the technique of irradiation of thin films by Ga+ ions inside of scanning electron microscope, by a focused ion beam is developed. The influence of irradiation on magnetic properties of thin epitaxial films of Co, grown by molecular beam epitaxy in ultrahigh vacuum on a silicon surface with a intermediate layer of copper atoms. It has been shown that low radiation doses lead to an increase of magnetic hardness of the samples. At higher doses, there is a decrease of coercive force, which is apparently due to a change of crystalline structure of the material. An interesting fact is that in the dose range of 1012-1015 the relative remanences is practically unchanged and only at higher doses the magnetic properties of the film worsen.
Comparative Study of the Synthesis Condition for Orthodontic Polymethylmethacrylate Powder
Authors: Roongrujimek Pitchaya , Saen-Isara Tassanaporn , Yodmongkol Sirasa , Dechkunakorn Surachai , Anuwongnukroh Niwat , Srikhirin Toemsak , Tanodekaew Siriporn
Published: September 2014

The aim was to investigate particles of poly (methylmethacrylate)(PMMA) prepared by suspension polymerization using different concentration of a stabilizer and by varying of the agitation speed at 300, 400, and 500 rpm. Particle size distribution (PSD), and morphology of the PMMA powders were observed and compared with commercial orthodontic PMMA powder. The experimental results indicated that the increasing the agitation speed tends to decrease the particles size at 0.08 wt % stabilizer.
Effect of Interchanging Liquid Components of Two Auto-Polymerizing Orthodontic Acrylic Resins in their Flexural Properties
Authors: Saen-Isara Tassanaporn , Dechkunakorn Surachai , Anuwongnukroh Niwat , Srikhirin Toemsak , Tanodekaew Siriporn
Published: September 2014

Objective: To evaluate the effects of interchanging the liquid components of two commercially available orthodontic auto-polymerizing acrylic resin in their flexural properties, clarity and setting time
Oil Production from Polyethylene Plastics by Thermal Pyrolysis Using a Reflux Condenser
Authors: Wajima Takaaki , Zar Zar Hlaing , Hideki Nakagome
Published: September 2014

Polyethylene (HDPE) was pyrolyzed at 450 °C using a reflux condenser to produce oil for recycling of waste plastics. HDPE was pyrolyzed in the glass reactor with a reflux condenser, and the reflux condenser was varied from 150 °C to 200 °C. With increasing the temperature of reflux condenser, the yield of oil increases and the product oil contains the components with higher molecular weight.
Study about the Stone Curves and the Development of Polygonal Shape Cutting Device
Authors: Oh Sung Hoon
Published: September 2014

Through this study, equipment was developed which could work large size stones into linear and curve shaped cutting planes and cut polygonal shaped stones during the lapping and semi-finishing works which are pre-tasks to manufacture the large size building column or large size stone statue which is installed in the temple. The best is to read these instructions and follow the outline of this text. Safety of equipment could be secured using design program and structure interpreting program and productivity could be improved by reducing the required manpower and working time for rough grinding and semi-finishing works through positioning control module. This technology is expected to be utilized in manufacturing various stone equipments by applying the working path generation and oil pressure technologies as the type of NC work equipments as well as in future working area.
Reinforced Concrete Deep Beams with Openings Strengthened Using FRP – A Review
Authors: Chin Siew Choo , Shafiq Nasir , Kusbiantoro Andri , Nuruddin Mohd Fadhil
Published: September 2014

In the modern building construction, different size of openings are provided in the web of reinforced concrete (RC) deep beams to accommodate utility pipes and ducts of essential services such as electricity cable, telephone network and air-conditioning network. However, accommodation of such openings caused reduction in beam strength, stiffness and caused excessive cracking and deflection. Many investigations were conducted to study the behaviour of openings in beams and relevant strengthening options to reinstate the lost capacity. One of the strengthening options considered lamination of fiber reinforced polymer (FRP) sheets due to its superior properties such as high tensile strength and stiffness, high resistance to corrosion, excellent fatigue performance and good resistance to chemical attack. FRP lamination has been widely accepted by the research community and practicing engineers in the construction industry as the material for strengthening and rehabilitation of common problems. However, quite limited literatures contained the use of FRP to strengthen RC deep beams with openings. This paper discussed the review of eleven different articles contained study of RC deep beams with openings together with effects of strengthening using FRP sheets. The outcome of this review paper outlined the way forward and future research focus in this area.
Numerical Simulation of Galloping for Iced Quad-Bundled Conductor
Authors: Shi Jun Jie , Li Ya Nan , Qin Li
Published: September 2014

The theoretical study of galloping can effectively promote anti-galloping techniques. Cable element is utilized to imitate the bundled conductor, and beam elements are used to simulated the spacers, established galloping finite element analysis model which can consider sub-conductors wake interference. The finite element equation was solved by time integration method and the calculation program was compiled by MATLAB. Through numerical simulation analysis, compared the dancing in the case of considering the effect of the sub-conductor wake and ignoring the effect of the sub-conductor wake. The results showed that considering the effect of the wake on aerodynamic loads has a greater vertical vibration amplitude. This method can provide reference for the study of prevention technology on dancing.
Research on Influencing Factors of Manufacturing Listed Companies’ Working Capital Policy in China
Authors: Hu Qiang , Wan You Qing , Wang Jie Qiong
Published: September 2014

At present, the majority of the researches on factors affecting policies of listed company working capital mainly focus on internal environment, which result in the ignorance of the outside condition. However, as the major participant for social economic activity companies, the outside situation will definitely have an influence on the formulation of working capital policy. Therefore, basing on former studies, this paper comprehensively combines inner factors with outside ones, and selects the data from long-standing manufacturing companies, and applies the panel data model in order to figure out how these factors work on companies’ working capital policy.
Study on Rigidity of Aluminum Alloy Portal-Type Frame Based on Finite Element Method
Authors: Zhong Xiao Qin , Wei Fei Xing , Hu Ting , Liu Ying
Published: September 2014

An aluminum alloy portal-type main frame with double beams is designed in accordance with real production requirements of manufacturer. The working performances of the frame in different structures and under diverse loading conditions, along with the static strength simulation of rigidity on the basis of finite element method are studied, of which the key findings will provide the manufacturers with theoretical foundation for safety production and expand the allocation of aluminum alloy sections.