bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Surface Roughness in Micro Milling of Ti-6Al-4V Titanium Alloy
Authors: Baldo Denison , Ribeiro Filho Sergio Luiz Moni , Lauro Carlos Henrique , dos Santos Delfino Andrea Cristiane , Brandao Lincoln Cardoso
Published: December 2014

This work shows a study on the micro milling of Ti-6Al-4V Titanium alloy where the effect of tool wear on the surface finish of the machined part was analyzed. New and worn micro cutters were applied to produce grooves with 0.5 mm of width and 0.025 mm of heights. The surface roughness was measured in the Ra and Rz values and the results showed that the surface roughness was not influenced by the tool’s condition. However, when new tools were used the increase of cutting speed generated an improving of the surface roughness and the same effect occurred with the decrease of feed rate.
The Crack Control of Reinforced Concrete Structures
Authors: Wang Gang
Published: December 2014

With the continuous development of the level of China's political, economic and social, the construction industry also obtained great progress. At the same time, the quality problems of all kinds of building has become a very serious problem which restricting the expansion of the scale of the enterprise. Along with the global integration, exchanges between domestic and foreign construction companies are becoming more and more frequent. The quality issues is in relation to the future of the construction industry. Only to deal with this problem, we can win in the international competition of the company. In the future for a long period of time, the construction industry will have a greater impact on the national economy of our country. If we can not solve the fundamental problem restricting the development of construction industry, the development of this industry will not sustainable. There is a very serious problem In the course of engineering construction which is the crack control of reinforced concrete structures. If this problem can be solved, we can produce a relatively good effect in the development of China's construction industry.
Use of Residential Area Landscape in the Landscape Design
Authors: Fan Xiao Xia
Published: December 2014

Residential area greening is an important part of urban greening, close to the residents, the most closely relationship with residents' daily life, it is the improvement of the quality of living environment, improve people's physical and mental health is very important. Residential area greening level, is an important symbol of urban modernization. Residential green space's most widely distributed in the urban landscape green space system, is the crucial aspect of common greening, is an important part of the urban ecological system.
Investigation on Braced Excavation Using Elastic-Plastic Material
Authors: Yang Hsi Chi
Published: December 2014

Finite element method has been used to study the behavior of soil excavation. The solutions were generally obtained assuming linear elastic soil behavior. However, this paper treats the soil as an elastic-plastic medium. The simulation techniques used in the braced field excavation are presented first and then, in order that a converged solution can be obtained, an iteration solution technique called the mixed stiffness method is used in the incremental nonlinear finite element analysis of the field problem where the soil behavior is simulated as elastic-plastic by employing the Drucker-Prager model. The solution techniques and procedure presented can be applied to future soil excavation problems.
Verification of Rankine Earth Pressure Theory Using Finite Element Analysis with Elastic-Plastic Material
Authors: Yang Hsi Chi
Published: December 2014

To simulate the Rankine earth pressure theory in the finite element analysis, a frictionless rigid wall and backfill system supported by rollers can be used. Beginning from the initial at-rest pressure conditions, the wall is moved towards or away from the backfill in a series of increments, until the passive or active earth pressure condition is reached. To obtain numerical solutions, twenty-five finite isoparametric elements are used to simulate the backfill and six linear bar elements to represent the rigid retaining wall. In order to simulate the incremental displacements, bar elements with a very high stiffness are used. The effect of wall displacement can be accomplished by applying a load equal to the value of the bar stiffness times the displacement to the nodal points that connect bars and soil elements. The elastic-plastic Drucker-Prager soil model is used in this study. Two earth pressure study cases have been analyzed. The first case deals with a cohesionless soil, while the second one a cohesive soil. The obtained load-displacement curves and stress-displacement curves are presented. It is found that the earth pressures behind the retaining wall at different heights based on the numerical solutions are identical with the calculations obtained from the Rankine earth pressure theory.
Finite Element Analysis of Corrosion Damaged Pipeline Using PZT-Based Ultrasonic Guided Wave Energy Method
Authors: Yan Shi , Yuan Xin Zi , Zhao Nai Zhi , Wang Wei , Cheng Yang
Published: December 2014

PZT-based ultrasonic guided wave has played an important role in health monitoring of pipeline structures. By using the PZT-based ultrasonic guided wave energy method and finite element software ABAQUS, the numerical simulation is performed to analyze various corrosion damaged pipeline structures, emphasizing on the damage identification, sensitivity analysis and longitudinal energy attenuation of the guided wave along various corrosion damaged pipelines. The preliminary analysis of the echo signals shows that the grass-like clutter wave belongs to echoes of the corrosion damage of the pipeline, and the wave energy spreads faster here. At the same time, by frequency spectrum analysis of the echo signal, the relationship between the reflection coefficient and the radial depth of defection is made which can be used to approximately evaluate geometrical dimension of the damage.
Binder Leakage Test Methodology of Drainage Asphalt Mixture
Authors: Yin Yan Ping , Li Ting , Jiao Fang Fang , Chen Hua Xin
Published: December 2014

Based on the binder leakage tests at 170°C and 185°C, three methods of binder leakage tests including the beaker method, the enamel plate method and the basket method were compared to analyze the rational control index of binder leakage loss of asphalt mixture .Then the Marshall test, scattering loss test, rutting test and design voids were used to verify the pavement performance of drainage asphalt mixture. Results showed that the basket method of binder leakage loss rate of 0.8% of the maximum amount of asphalt can satisfy the pavement performance requirements and can be the fundamental basis to determine the maximum drainage asphalt content.
Research on the Vulnerability Risk Assessment of Water Supply Network under Earthquake
Authors: Li Xiao Juan , Shen Fei Min
Published: December 2014

The seismic vulnerability of water supply network system refers to the network after the quake affected degree of each node. Based on mutation progression method, water supply pipe network seismic vulnerability is analyzed. Position in network topology and node service features as factors, which influences the network vulnerability assessment indexes is determined. The vulnerability level of the network could then be evaluated using qualitative and quantitative methods. This approach is validated to be effective and appropriate through an application to a post earthquake analysis of a water supply network system.
Calculation of the Internal Temperature Field of Transformer by the Method of Combination the Finite Element and the Finite Volume
Authors: Ma Lun , Wang Liu , Sun Ying Ying , Wan Tao , Wei Jia Peng , Dang Jian Fei , Qin Qi
Published: December 2014

Oil immersed transformer is an important equipment ofpower system, whose fault is often caused by the aging of insulation. In actualoperation, accurate calculation of the temperature field, especially hot spottemperature of transformer winding, is very important for stabilizing the powergrid operation and extending the transformer life. In order to calculate thetransformer's hot spot temperature accurately, a new method which is based oncomparison of respective advantages of the FEM and FVM is used; we take a31.5MVA transformer as exemple, using the hybrid method of the FEM and the FVM,the three-dimensional temperature field of transformer is calculated. Bycomparing the figures of top oil temperature of transformer monitored by theoperating transformer and the figures calculated by mixed method, the marginerror of the hot spot temperature is only 1.9°C. While the IEEE guidelines formodel calculation results, the calculated results of FEM algorithm and FVMalgorithm results with the monitoring data of standard deviation were as highas 4.6 °C, 3.8 °C and 3.1 °C. The Calculation accuracy is much higher than theaccuracy of the result using IEEE regulatory model, FEM and FVM, proved thatthis mixed method can calculate the internal temperature field of oil immersedtransformer accurately.
CO2 Distributions in an ICU with Modified Nightingale Type Layout
Authors: Chang Chih Yi , Yang Lung Shih , Tseng Liang , Cheng Tsung Jung , Sung Wen Pei
Published: December 2014

This 2-phase study was carried out in an adult medical ICU with modified Nightingale type layout at a medical center in central Taiwan. Among 17 wards, 8 were selected for sampling test. The averages of CO2 level in both phases met the legal requirement. A significant difference of CO2 concentration was found among different locations of the sampling wards. The top two occurred in the location of off the circulation (Ward E) and facing the entrance (Ward A), the lowest occurred in the middle of the circulation (Ward C and G). Significant associations were found between CO2 concentration and number of visitors in 5 sampling wards, except Ward C and G.
Study on Corrosion of Old 220kV Transmission Lines in Shanghai
Authors: Ren Xi Chun , Xia Kai Quan , Deng Yuan Jing
Published: December 2014

To study the corrosion of old 220kV transmission lines especially conductor in Shanghai, methods as visual inspection andmetallographic analysis are used to conduct an experimental research on the atmospheric corrosion of old conductors. The appearances and metallographic structures of conductors in service are examined and their mechanical property indicators are analyzed.Based on the corrosion mechanism of aluminum and galvanized steel wires, the research on the corrosion of ACSR which has run for years concludes that the outer aluminum wires of the 220kV old conductors that have operated for years are more corroded than the inner wires and the resistivity exceeds the standards although there is no significant drop in the mechanical indicators. The results in this research can provide technical support and guidance for the life evaluation of old transmission lines in the country.
The Temperature Distribution of Oil-Immersed Transformer Starting with Heavy Load in Cold Regions
Authors: Wan Tao
Published: December 2014

When the large oil-immersed transformer start with heavy load in cold regions, due to the high viscosity of the oil at low temperatures, the flow of the oil is extremely slow in the early start of heavy load, resulting in a negative heat radiation. At the same time, the winding and the core are rapidly increasing heat in the early start of heavy load. Rapid increase in heat and the lack of heat dissipation caused a series of problems. In this paper, we study the process of heating and cooling when the large oil-immersed transformer start with heavy load in cold region and takes a transformer of 31.5MVA as example to build a three-dimensional model ,the model is based on the actual size of the transformer. We use the finite volume method to calculate three-dimensional temperature field distribution changing with time when the oil-immersed transformer startup with heavy load in - 35 °C,-30 °C and-25 °C three cases. The results show that the viscosity coefficient of transformer oil is very high at low temperatures. In the early start of the transformer, because of the poor fluidity of the oil, the heat cannot be dissipated in time and the transformer local overheating near the winding. Then we analyzes the damage of local overheating for a short period of time in the transformer, especially the damage of the oiled paper's insulation At last ,we analysis of the causes of transformer internal local overheating and give some measures to avoid local overheating when oil-immersed transformer start with heavy load in cold regions.KEYWORDS: oil-immersed transformer, cold regions, start with heavy load, FVM, three-dimensional temperature distribution
Research of LED Solar Insecticides Lamp
Authors: Li Zhen Dong
Published: December 2014

In this paper, we design a modified insecticides lamp, LED the device by using solar battery as a power supply, high voltage power grid as a hunting tool, through the MCU drive different wavelength of LED strobe. Compared with ordinary insecticides lamp insecticide effect, improved the LED insecticides lamp peculiar four-color stroboscopic technology can be more traps in pests. By sampling clock chip and humidity sensitive resistor, the device will automatically work in spring and summer clear night, met YinYuXue fog and other adverse weather will automatically shut down. The device can be applied to farmland, orchards and other places of a large area of farming, and human nature, energy saving, environmental protection, for the development of LED insecticides lamp provides a new train of thought.
The Numerical Simulation of the Relation between Displacement Ventilation Efficiency and Different Outlet Position
Authors: Hu Zhen Jie , Song Xiao Fan
Published: December 2014

Using CFD software to simulate the indoor different ventilation system of different outlet position. Analysis the characteristics of the interior velocity field and temperature field in different conditions.We obtain in the same conditions ,set air vent on the home have a bigger efficiency than the traditional way.,and supply air velocity has a remarkable influence on the ventilation efficiency compared to the supply air temperature.
Computer Local Area Network Security and Management
Authors: Wang Jian Hang , Wang Hai Bo
Published: December 2014

Development of computer network technology has greatly improved the sharing rate and utilization of information resources, many areas are widely used local area network, widely used degree gradually expose their security and confidentiality issues. In particular, people lack knowledge on security policy and network security control mechanisms, leading network security becomes more complex. In this paper, the main problem with the current computer Local Area Network security and the starting point, the focus of the analysis and management of their security and confidentiality measures, hope to further enhance the computer LAN security.
Adaptive Micro-Channel Real-Time Interactive Systems of Nanchang Road Congestion Based on Improved Dijkstra Algorithm
Authors: Ling Jin
Published: December 2014

The key technology research and development projects of national vehiclenetworking system needs, software products and components, developed withindependent intellectual property rights and core technologies based onimproved Dijkstra algorithm Nanchang road congestion adaptive system based onmicro-channel real-time interaction; main contents of transportation forNanchang adaptive significance of congestion vehicle networking applications,the status quo and research problems. GPS has immediate feedback andmicro-channel platform for mutual exchange of powerful features. Thuscountermeasures to enhance vehicle networking applications, Jiangxi Science andTechnology Park level. Developed based on the GPSNanchang traffic congestion adaptive micro-channel platform system, thesoftware product has low prices, professional, practical, easy installation,simple operation, with independent intellectual property rights, perfectlysuited for automotive units practical operation. Has a strong competitiveadvantage. The research results can be widely used in the province actual carservice units (including the use of e-commerce), a system price of Wu Yuan,automotive service products can be formed in Jiangxi Province, the developmentof new industries and generate significant economic benefits.
An Applicable Platform for Web Interactive Content Hapticization
Authors: Chen Wei Yu , Chu Yen Ming , Sato Makoto , Honma Teruki
Published: December 2014

Haptic technology again receives extensive attentions recently by virtue of improvement on Internet Technology. This paper presents an applicable platform for Haptics by employing physical features of sense-of-touch through electromechanical devices and the latest attractive HTML standard specified by W3C, aims at offering new attributes and reliable communications with the ease of use for web content. In addition, the proposed platform demonstrates its significance on wrapping up fundamental rendering methodologies including Haptics and web graphical content, is a step forward in supporting study of all fields related to web-based interactive content (e.g., Haptics researchers, physicists, software engineers, and web designers). Finally, we provide a conceptual example of proposed platform and prove its proficiency on haptic data communication. The results of the experimental evaluations highlight the effectiveness, stableness, affordance and extensibility for future research.
Computer Network Management Technology and its Application Glimpse
Authors: Li Hong Jin
Published: December 2014

Computer network is a product of modern computer technology and communications technologies. Computer network management technology refers to the initialization operation and monitor operation of computer networks in the active state. Computer network management technology function is to collect the related information in the network system. This article will mainly focus on computer network management technology and its application to start on.
Construction of Associative Algorithms of Frequent Invasion Sequence Based on Privacy-Processing
Authors: Zhu Hui Jie , Wei Chun Bo , Gao Zhen Dong
Published: December 2014

In order to work on research on analysis the relationship of invasive alarm, establish a net-safe frame integrated technology of privacy processing. The mining algorithms of K- Frequent Patterns is improved in research on quantity of invasive alarm, a generalization measure method has been proposed which focus on effectiveness ，by improving the algorithms, bring out associative algorithms of frequent invasion sequence with privacy-processing integrated, privacy-processing of invasive alarm data has been achieved effectively. Experiment shows that the association rules which get from improved algorithms are available, and the improved algorithms have the ability to protect the sensitive information. A conclusion has been made from the results: After privacy-processing, the frequent invasion sequence algorithms have preferable validity, scalability and mining performance.
Design and Optimization of Feeder Bus Connecting Communities and Subway
Authors: Guo Xiao Jun
Published: December 2014

To balance passengers belong to the same community which has multi subway stations, this essay locating feeder bus stations with IP(integer programming), considering departure interval of subway, solving TSP(travelling salesman problem) with MPGA(multi-population genetic algorithm).
Discussion on the Application of Ultra Wide Band Wireless Communication Technology in the Coal Mine
Authors: Ding Hong Wei , Zhao Yong Bao
Published: December 2014

Coal mine underground information management is a large-scale and complicated management process. The applications of modern management means of professional, industrialization, mechanization and informationization have provided sufficient basis of science and technology to the horizontal underground information management level. This paper has introduced the BS/model system to change the present situation of the existing enterprise staff information management which is not perfect. In this paper, the background and the significance in the coal mine management in ultra wide band wireless communication technology based on information management, put forward the purpose and the main content of the mode, function framework with underground staff information management information system and each module, finally the relevant discussion information system application has been made.
Optimal Chemical Control Based on τ-Periodic Solution Models in Pest Management
Authors: Yang Guang
Published: December 2014

For the issue of the optimal chemical control method in agricultural pests, impulsive differential equations theory is applied to establish and analyze both the pest management model of spraying pesticides and the corps effectiveness model; for -periodic solution models, in order to make the residual pesticide dosage in crops and the dosage of spraying minimum, control pest number under the economic damage threshold, optimal control theory is employed to determine the optimal pesticide dosage and spraying interval. So, a best method about controlling agricultural pests via pesticide is given. Finally, Numerical Simulation is used to explain the implement of this method.
Research and Realization of Automobile Transmission Quality Information Technology of Internet of Things Based on Traceability
Authors: Ling Jin
Published: December 2014

This research mainly according to automotive modular production characteristic, proposed for tracing method module production in batches; parts relation and order information system construction of internal and external traceability system model; using the mass matrix and the batch list theory, research on the above two kinds of design theory of quality traceability scheme based on distributed management system, and establish the integrated application model and parts material network technology suppliers; tracing back combined back and realize the goal of batches of the product quality control in advance and the defects of the products. Through the research on the theory of reference to the use of the Internet of things technology, technology focus of the study lies in the application of IDEF modeling method, the integrated use of Excel's powerful data processing tools and Pareto Diagram, combined with the RFID tag technology, and achieve the goal of defective product traceability and batch tracking combined. The key technology for the RFID radio frequency technology, the IDEF method and the two dimensional code identification etc.
The Practice and Evolution Research of the Enterprise Data Communications Network to IPv6 Technology
Authors: Li Jing , Li Ting Rui , Zhang Lin
Published: December 2014

Enterprise data communication network is the fundamental transmission platform of carrying all kinds of business. With the technology development of smart grid and the Internet of things, a large number of addressable, independently managed entities are emerged. The address space, QOS and security mechanism of data communications network are put forward higher requirement. Technology system of the enterprise data communication network was described in detail. The key evolution technologies of MPLS VPN network to IPv6 was focused on. At the same time 6VPE technology was used to practice effectively. The evolution route about the enterprise data communications network was put forward, which can be a foundation for the next generation Internet technology in the enterprise application.
Computer Network Attack Modeling and Network Attack Graph Study
Authors: Qin Yuan
Published: December 2014

With the development of computer network and rapid popularity of Internet, network information security has become the focus of safeguarding national security and social stability. In the network security event, the hacker often can’t successfully intrude into the network by means of a single host / services hacker. With the help of various kinds of "vulnerability" generated bydifferent relationship existing in multiple point multiple host, the hacker can achieve the purpose of network intrusion. Therefore one important aspect of network security is after obtaining the vulnerability of the network information, considering a combination of multiple exploits and analyzing the attack path of network penetration attacks that the attacker may take.
Digital Audio Water Marking Technology Research
Authors: Wang Yan Yu
Published: December 2014

The basic concept of digital audio watermarking technology prompt digital audio watermarking techniques as evidence of legal products used for protection of intellectual property rights. Robustness and perceptual, detectable, embedded data volume index, to extract the watermark does not need the raw data is the basic requirement of digital audio watermarking technology. The concept of information hiding, the multiple meanings of the two aspects of a narrow sense and a broad understanding. Digital audio watermarking has strict process and the basic model, is used in the protection of intellectual property rights, and other fields.
Design and Implementation of Virtual Roaming Based on Unity3D
Authors: Liang Sha
Published: December 2014

Along with the rapid development,3D virtual reality technology has been applied more and more widely. In order to display the virtual scene better and make user an immersed body experience, 3D rendering engine plays a key role in this field. Unity 3d is a professional gaming rendering engine with strong compatibility and comprehensive integration. In this paper, we focus on the Unity 3D rendering engine, and describe the basic workflow of virtual roaming. We discuss the key technology to realize outdoor roaming through Unity 3D and optimization.
Research of Real-Time Data Presentation of Cloud Monitoring Based on Highcharts
Authors: Bian De Zhi , Li Jing Tao
Published: December 2014

Based on industry, agriculture and rail transit to the data in real-time monitoring tasks, this paper proposes a new cloudmonitoring method, it mainly studies the real-time data presentation.This article uses the graphical component of Highcharts and the dataextraction technology of JQuery, it can present efficient real-time data to managers, it can also make managers learn quickly the shape of the data and the possibility of adverse conditions.
Study of System Design Based on Three Machine Vision of Three Axis Dispensing
Authors: Cheng Wen Ming
Published: December 2014

With the rapid development of computer technology and electronic technology, the future will be a large number of the use of automation equipment instead of manual operation, to meet the complex control, high precision, multi axis motion control card applied in NC system will become more and more widely. This paper studies three axis dispensing machine positioning control system based on machine vision, not only uses CCD camera to clear description sheet dispensing area real time scanning, using the smoothing operation and the value of the two methods for the acquisition of image preprocessing, and the use of image morphological operation extraction dispensing location coordinates, to solve the traditional dispensing mode of open loop low control accuracy, low efficiency and poor stability problem. Experimental results show that this system is tested and used are able to meet the requirements, in the long time repetition work greatly reduce the use of artificial also can greatly improve the production efficiency and product quality are improved.
Ferri-Magnetic Sorbents of Heavy Metals and Radionuclides on Base of Humates, Isolated from Oxidized Coals
Authors: Kairbekov Zh.K. , Yemelyanova V.S. , Shakiyeva T.V. , Dossumova B.T. , Dzhatkambayeva U.N. , Shakiyev E.M.
Published: December 2014

The results of synthesis and researches of hybrid gumic-magnetic composites are presented in the article. The possibility of regulation of quantitative speciation of composites (containing of Fe) is established at the variation of proportions Fe (II), Fe (III)/HA and the way of reagents injection in a reaction mixture. The possibility of designing of sorbents on the basis of humic acids and chemically connected particles of iron oxides as magnetic-active components for fixation and extraction of heavy metals ions and radionuclides from natural objects by means of magnetic separation is shown. The adsorption degree stands at 95% in an optimal mode.
Internal Flow Field Analysis of Engine Intake Manifold Based on RE and CFD
Authors: Wang Cai Yun , He Zhi Xia , Wang Qian , Zhang Guo Jun , Wang Shuo
Published: December 2014

The performance of the engine air intake system directly affect the working performance and fuel consumption, where the intake manifold design is the key.In this paper aimed at L91 Engine intake manifold ,firstly theRE(Reverse Engineering)technology was usedto rebuild the3d model of intake manifold.And then the internal flow zoneof the intake manifoldwas meshedin the pre-processing software ICEMand the internal flow fieldwas analyzedin the softwareof Fluent.The numerical model was verified by comparing the simulated and measured results. And then based on the numerical analysis of the internal flow characteristics of the intake manifold, the structure of variable-length intake manifold was come up with and finally was numerically proved to be better than the normal one.
Application of TRIZ and Universal Design in the Design of Pressure Sensing Pacifier
Authors: Yang Shu Chen , Hsiao Hui Ling , Lin Yin Chi , Li Kuo Yi
Published: December 2014

This study proposed an innovative design of pressuresensing pacifier to solve the problem of lack of sucking ability of newborninfants or premature infants, as well as the problem of caregivers lacking inthe knowledge of when to feed the infants. TRIZ was adopted as the researchmethod. The modification and deterioration parameters of contradiction matrixwere used to identify the invention principles for systematic innovationdesign. Moreover, the seven techniques of the universal design were used toapply the proposed pressure sensing pacifier on infants. The pressure of thepressure sensing pacifier was in the range from -50 to -75mmHg. Bymodifications of these data, the infants are allowed to receive better care.This study also designed a set of pressure sensing device for clinical medicalpersonnel and researchers to measure the sucking ability of premature infants.The objective assessment tool is expected to help medical personnel to masterthe development stage of the sucking ability of premature infants to identifythe best feeding opportunity.
Double Fluid Potting Glue Machine Technology Research
Authors: Xiao Shou Bai
Published: December 2014

With the rapid development of China's economy,especially the steady development of machinery industry in recent years, bringrare development opportunities for dispensing machine industry, dispensingmachine products in the national economy departments belong to one of theproducts are bedding face is wide. This paper mainly introduces the workingprinciple of double liquid potting glue machine and the functioncharacteristic, expounds its metering system sealing technology, one-way valvetechnology, hybrid technology principle, and its key technology and thereliability is studied.
Numerical Investigations on Characteristics of Methane-Air Premixed Flame
Authors: Su Yi , Wang Ning
Published: December 2014

The combustion reaction mechanism of methane plays an important role on combustion, environmental protection and propulsion areas. Numerical investigations on the characteristics of Methane-Air premixed flame were conducted in this paper. Results indicate that: intermediate products such as HCO, CO increase first and then decrease; CO distributes behind HCO and is converted from HCO; The distribution of OH radicals is one dimensional, and there are two high concentration regions, only the region at the exit of the premixed gas corresponds to the flame front; final products such as CO2 and H2O exist at the whole reaction area.
Thermal Cycling Simulation during Remelting Process of the Steel ASTM A743-CA6NM
Authors: Martins Camila Almeida , Ramirez-Behainne Jhon Jairo
Published: December 2014

This study aimed to model numerically the thermal cycling resulting from the steel ASTM A743-CA6NM remelting process. The problem was solved with the support of the commercial software ANSYS / FLUENT ® 14.5 for the three-dimensional case using the finite volume method. The following simplifying assumptions were adopted: heat loss by natural convection, absence of radiation, no phase change, concentrated heat source, and thermophysical properties independent of temperature. The results were analyzed for two different current intensities: 90A and 130A, and compared with experimental measurements. The peak temperatures of the thermocouples near the fusion line for the current of 130A were well represented by the numerical model, with a maximum deviation of 9.62%. In the case of the more remote thermocouples from the fusion line, the best results were obtained for the current of 90A, not exceeding 5% of deviation. In general, it was found that the tested body is heated faster than in simulations. This can be considered as a consequence of the simplification in material properties, which were assumed constants with temperature. The results of this study demonstrate that, given the adopted simplifications, the numerical model was able to satisfactorily reproduce the experimentally measured thermal cycles.
A Mechanistic Model for End Milling Cutting Forces in Brittle Porous Material
Authors: O’Connor Alex , Ramulu Mamidala
Published: December 2014

A mechanistic model capable of predicting end milling cutting forces in brittle porous media is described. A coefficient which is capable of reproducing the random shape and variation in cutting forces due to porosity is proposed. In addition, a method of experimental determination of cutting force coefficients is outlined. The proposed model is based on the hypothesis that the random shape and variation in cutting forces of brittle porous media coincide with the shape and variation of pore size and distribution in the media. The developed coefficient and model is compared to end milling tests conducted in CB1100, a porous machinable alumina based ceramic manufactured by UMECO. High correlation between predicted and measured cutting forces is shown. Experiments show that the model is capable of accurate prediction of variation in individual cutting tooth force profile shape and overall magnitude over the entire range of machining conditions tested. The benefit of the model lies in its ability to greatly reduce the number of cutting tests required when investigating cutting forces in novel brittle porous materials.
Study on the Heat Treatment Process by Using Residual Heat after Forging of Steel 40MnB
Authors: Zhang Liang Zhi , Zhang Han
Published: December 2014

We conduct the process experiment on the shaft of the 40MnB steel after forging, and propose the scheme of heat treatment by using residual heat after forging process. According to the experiment results, the internal structure of 40MnB was improved, the metal grain was refined, the mechanical properties was better and the quality was guaranteed. At the same time, it improved production efficiency, shortened the production cycle and reduced the cost.
Hybrid Analytical-Numerical Analysis of SAE 4150 Alloy Steel Rods Cooling
Authors: Ferreira Pelegrini Marcelo , Alves Thiago Antonini , Baptista Nishida Felipe , Verdú Ramos Ricardo A. , Macedo Maia Cassio R.
Published: December 2014

In this work, a hybrid analytical-numerical study was performed in cooling of rectangular rods made from SAE 4150 alloy steel (0.50% carbon, 0.85% chrome, 0.23% molybdenum, and 0.30% silicon). The analysis can be represented by the solution of transient diffusive problems in rectangular cylinders with variable thermo-physical properties in its domain under the boundary conditions of first kind (Dirichlet condition) and uniform initial condition. The diffusion equation was linearized through the Kirchhoff Transformation on the temperature potential to make the analytical treatment easier. The Generalized Integral Transform Technique (GITT) was applied on the diffusion equation in the domain in order to determine the temperature distribution. The physical parameters of interest were determined for several aspect ratios and compared with the results obtained through numerical simulations using the commercial software ANSYS/FluentTM15.
Study on the Compatibility of Self-Compacting Concrete Thickener and the Cementitious Material
Authors: Zhang Xia Zhen , Tang Shi , Zhang Xia Hong , Li Peng Ping
Published: December 2014

Self-compacting concrete often requires greater liquidity, and the big liquidity is easy to cause the concrete segregation. Thickener can effectively improve the rheological properties of concrete, namely appropriately increase plastic viscosity, but does not significantly affect concrete liquidity. The compatibility of polyacrylamide (PAM), carboxymethyl cellulose (CMC) in the cementitious material system was studied. The influence of thickener on liquidity, 7d strength, 28d strength and shrinkage in cementitious materials system were analyzed.
Emulsion Explosives Containing Catalytic Metal Ion
Authors: Xie Xing Hua , Xu Kang , Zhou Hui Sheng
Published: December 2014

Compatibility and safetysystems research and production equipment and technology of explosives betweenitself, the establishment and development of the explosion mechanism ofexplosive accidents and prevent the occurrence of accidental explosion ofexplosives to achieve disaster prevention and reduction, to ensure the safetyof personnel and minimize property damage. Explosives production of metals andalloys commonly used in the device in an aqueous system, the compatibility ofthe ammonium nitrate, especially at higher temperatures and a variety ofelements from the synergy of explosives, etc. to accelerate the reactionconditions, to select a material with good compatibility, the nature of theexplosive increase in production safety, to solve the production of explosivesexplosion problem
Heat Transfer Simulation of Floor Structural Layer and its Optimization of the Main Parameters
Authors: Zhang Hui Min , Tao Shi Yang
Published: December 2014

The model of low temperature radiant floor system and room are establiashed in this paper, the Thermal in ANSYS is applied to simulate the temperature dsitrubution between different floor layers and at differnt room level under differnt water temperature of the inlet and outlet and the piping spacing. The conclusion is that the room environment and condition is optimal if the heating ssyetm is designed with piping clearnce at 100 to 250mm and water supply tempeatue from 40 to 45 °C.
Preparation and Structure of a Novel PS/Fe3O4 Nanochain
Authors: Yang Li , Lu Zi Yang , Yang Li Li , Zhao Xiao Xu , Zhu Zhi , Gao Nai Ling , Wang You Shan , Yan Yong Sheng
Published: December 2014

The novel PS/Fe3O4 nanochain was successfully synthesized via solvothermal and self polymerization method. The as-prepared PS/Fe3O4 nanochain was extensively characterized by TEM, SEM, XRD and VSM. These results indicated that Fe3O4 had the spherical structure, and the average diameter reached approximately 400 nm. PS/Fe3O4 possessed good chain structure and excellent magnetic property (Ms = 37.07 emu/g).
Thermal Stress Comparison on Copper and Gold Wire Bonded on Aluminium Bondpad
Authors: Retnasamy Vithyacharan , Sauli Zaliman , Abd Ghani Nabilah Fathiah , Kamarudin Hussin , Ahmad Norhawati , Yeow Aaron Koay Terr , Wan Norhaimi Wan Mokhdzani
Published: December 2014

This paper reports on the thermal stress comparison between gold (Au) and copper (Cu) wires in wire bonding. The objective of this study is to examine the stress induced during different operating temperatures. ANSYS 11 has been deployed as the simulation tool for this study. This simulation was performed using a three dimensional (3D) non-linear finite element model. The gold and copper wires were attached to an aluminium bondpad on a silicon die. The results showed that when the highest stress concentrates at the area between the ball bond and the bondpad. Moreover, increasing temperature will increase the von mises stress. As for this study, the Cu wire display the greater thermal stress compared to Au wire due to its harder and stiffer material properties.
Convection Condition Variation Analysis on Thermal Dissipation of High Power Single Chip LED
Authors: Retnasamy Vithyacharan , Sauli Zaliman , Vairavan Rajendaran , Kamarudin Hussin , Shahimin Mukhzeer Mohamad , Taniselass Steven , Menon P. Susthitha
Published: December 2014

High power light emitting diodes (LEDs) characteristics in terms of efficiency, long operating life and reliability which has lead to its application as lighting systems. However, the high power LEDs are subjected to thermal challenges due to it high input power. This work reports simulation analysis on a single chip high power LED to where thermal performances of the LED package were evaluated under varied convection condition. The simulation was carried out using Ansys version 11. The heat dissipation evaluated and compared in terms of junction temperature, von Mises stress and thermal resistance at each respective convection condition with constant input power of 1 W.
Heat Dissipation Simulation Analysis of High Power LED via Heat Slug Geometry Variation
Authors: Retnasamy Vithyacharan , Sauli Zaliman , Vairavan Rajendaran , Kamarudin Hussin , Shahimin Mukhzeer Mohamad , Taniselass Steven , Menon P. Susthitha
Published: December 2014

High power LEDs are currently being plagued by heat dissipation challenges due to its high power density thus limiting its further potential development and fulfillment. Exercising proper selection of packaging component could improve the life time of high power LED. In this work, the significance of the heat slug geometry on the heat dissipation of high power LED was addressed through simulation analysis. The heat slug geometries were varied in order to compare the heat dissipation of the high power LED. Ansys version 11 was utilized for the simulation. The heat dissipation of the high power LED was evaluated in terms of junction temperature, von Mises stress and thermal resistance. The key results of the analysis showed that a superior surface area is preferred for an enhanced heat dissipation of high power LED
A Simulation Strategy on the Quasi-Static Axial Crushing Process of Composite Tubes Based on LS-DYNA
Authors: Li Zhi Jie , Yuan Guo Qing , Hui David , Jia Zhe Min
Published: December 2014

Based on the code LS-DYNA, the simulation strategy on the quasi-static crushing process of composite tubes is studied by conducting two series of comparison simulations: one is at different virtual loading speeds with the real material density and the other is with different virtual material densities at the given loading speed. The simulation results are summarized as three types, namely mode-varying type (MVT), unstable type (UT) and stable type (ST), depending on the change of the structural failure mode and the occurrence of the load-fluctuating stage in the load-displacement curve. Analysis has shown that the steady load possesses the stability, the peak load has the convergence zone, and the thresholds of energy ratio can be adopted to evaluate the simulation results. In the end, the simulation strategy is proposed to makes it possible to acquire the simulation results with a higher query precision at a lower computing cost.
Shape Parameter Optimization of Inverse Multiquadrics Radial Basis Function for Vibration of Laminated Composite Plates
Authors: Chen Ying Tao , Xiang Song , Zhao Wei Ping
Published: December 2014

Free vibration of simply laminated composite plates is studied by the global collocation method based on inverse multiquadrics radial basis function. The choice of shape parameter of radial basis function has the important effect on the accuracy of meshless radial basis function collocation method. Genetic algorithm is used to optimize the shape parameter of inverse multiquadrics radial basis function. The natural frequencies of simply supported laminated composite plates are calculated using the inverse multiquadrics radial basis function with optimal shape parameter and compared with the analytical solutions.
Application of Nanocomposite Track Membranes for Electron Microscopy Samples Preparation
Authors: Khlebnikov N.A. , Polyakov E.V. , Borisov S.V. , Shepatkovskii O.P. , Krasil’nikov V.N.
Published: December 2014

In this paper the advantages of application of the nanocomposite track membranes (NCTM) with TiN coating as the substrates for sample preparation for their investigation by methods of electron microscopy are discussed. This membrane material was obtained by the ion-plasma sputtering of TiN coating on the polymer track-etched membrane. The physicochemical properties of NCTM were researched. Preparation technique allows to separate nanoand microdimensional samples from dry, liquid and gas mixtures for their investigation by methods of scanning and transmission electron microscopy.
Study on Multi-Objective Optimization of Hybrid Flow Shop Scheduling Problem
Authors: Lin Zheng Ying , Zhang Wei
Published: December 2014

Due to several mutual conflicting optimized objectives in the hybrid flow shop scheduling problem, its optimized model, including three objectives of make-span, flow-time and tardiness, was firstly set up, instead of the single optimized objective. Furthermore, in order to improve the optimized efficiency and parallelism, after comparing the normal multi-objective optimized methods, an improved NSGA-II algorithm with external archive strategy was proposed. Finally, taking a piston production line as example, its performance was tested. The result showed that the multi-objective optimization of hybrid flow shop scheduling based on improved NSGA-II provided managers with a set of feasible solutions for selection in accordance to their own preference. Therefore the decision could be made more scientific and efficient, and thus brings to the factory more economic benefits.
A Silicon Semiconductor Temperature Sensor Applied for RFID Tag
Authors: Chen Hui , Jing Wei Ping , Huang Shao Qing
Published: December 2014

A new type of silicon semiconductor temperature sensor applied for RFID tag chip is designed based on the linear temperature characteristic of base-emitter voltage of parasitic substrate PNP transistor. A novel switched capacitor integrator based on positive-negative synchronous integration is introduced to amplify the weak temperature signal precisely and provide a method to represent the temperature in analog domain. Temperature quantization is accomplished by a 12-bit ultra-low-power successive approximation analog-to-digital converter providing a resolution of 0.03125°C/LSB. The circuit was simulated by using device model of 0.18-μm CMOS process. The output integration swing is 2VPP and the average current dissipation is 38.91μA at 1.8V supply. The sensor achieves an accuracy of -0.1°C to +0.33°C in the temperature range of -39°C to 89°C.
STIPA Method in Public Adress Sound Systems and Voice Alarm Systems Part 1: The Theoretical Basis and the Reference Speaker
Authors: Drtina René , Lokvenc Jaroslav , Šedivý Josef
Published: December 2014

The transmission channel mediates the flow of information (information transfer) between the source and the information received. In terms of examining the technical characteristics of the transmission channel is probably the most widely used model Shannon-Weaver model of communication, in-processes to technical blocks. From the perspective of media communications and generally assess the overall effect of the transmission of information via Lasswell communication model.