bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis and Evaluation of Novel Privacy Preserving Techniques for Collaborative Temporal Association Rule Mining Using Secret Sharing
Authors: Nanavati Nirali R. , Sen Neeraj , Jinwala Devesh C.
Published: October 2014

With digital data being abundant in today's world, competing organizations desire to gain insights about the market, without putting the privacy of their confidential data at risk. This paper provides a new dimension to the problem of Privacy Preserving Distributed Association Rule Mining (PPDARM) by extending it to a distributed temporal setup. It proposes extensions of public key based and non-public key based additively homomorphic techniques, based on efficient private matching and Shamir's secret sharing, to privately decipher these global cycles in cyclic association rules. Along with the theoretical analysis, it presents experimental results to substantiate it. This paper observes that the Secret Sharing scheme is more efficient than the one based on Paillier homomorphic encryption. However, it observes a considerable increase in the overhead associated with the Shamir's secret sharing scheme, as a result of the increase in the number of parties. To reduce this overhead, it extends the secret sharing scheme without mediators to a novel model with a Fully Trusted and a Semi Trusted Third Party. The experimental results establish this functioning for global cycle detections in a temporal setup as a case study. The novel constructions proposed can also be applied to other scenarios that want to undertake Secure Multiparty Computation (SMC) for PPDARM.
Cost Models for Selecting Materialized Views in Public Clouds
Authors: Perriot Romain , Pfeifer Jérémy , d'Orazio Laurent , Bachelet Bruno , Bimonte Sandro , Darmont Jérôme
Published: October 2014

Data warehouse performance is usually achieved through physical data structures such as indexes or materialized views. In this context, cost models can help select a relevant set of such performance optimization structures. Nevertheless, selection becomes more complex in the cloud. The criterion to optimize is indeed at least two-dimensional, with monetary cost balancing overall query response time. This paper introduces new cost models that fit into the pay-as-you-go paradigm of cloud computing. Based on these cost models, an optimization problem is defined to discover, among candidate views, those to be materialized to minimize both the overall cost of using and maintaining the database in a public cloud and the total response time of a given query workload. It experimentally shows that maintaining materialized views is always advantageous, both in terms of performance and cost.
Remote Access to Scientific Laboratory Equipment and Competency-Based Approach to Science and Technology Education
Authors: Mazuritskiy M.I. , Safontsev S.A. , Konoplev B.G. , Boldyreva A.M.
Published: October 2014

This article describes the competency-based approach to e-learning education that utilizes remote access to the laboratory equipment. The main focus of the paper is the structure and design of the e-learning system used in the Southern Federal University (Russia). The article discusses the related pedagogical strategies and presents system's features in the context of the education for skilled workers. This approach uses access to the scientific and technology laboratory equipment either for provisioning of the individualized educational programs or to enable the students who are unable to attend a conventional laboratory for a variety of reasons, such as disability, and part-time study to conduct the experimental work. It will be shown that the experimental work involving the modern scientific equipment is an important aspect of the learning process in the areas of material science and nanotechnology. The learning strategy is the reverse of that used in the traditional approach. The authors suggest to start with the introduction to the practical applications of science and technology relevant to the current job market, and study the general laws and theoretical principles afterwards, to deepen understanding and achieve the educational goals.
The Impact of Clickers Use on Vocabulary Knowledge and Satisfaction in an EFL Class in China
Authors: Zhonggen Yu
Published: October 2014

Clickers are catching growing attention in education. This study, using data collected from a questionnaire, forty content words, and a vocabulary knowledge scale, aims to identify if clickers can enhance EFL (English as a foreign language) vocabulary knowledge and raise students' satisfaction level compared with the traditional multimedia-based instruction. Gender differences were also explored. Data from 115 EFL learners showed that: (1) Clickers-based instruction significantly increased participants' satisfaction level compared with traditional multimedia-based instruction in an EFL class; (2) Clickers-based instruction significantly enhanced participants' vocabulary knowledge compared with traditional multimedia-based instruction in an EFL class; (3) Males were significantly more satisfied with clickers-based instruction than females in an EFL class and there were no significant gender differences in satisfaction levels under multimedia-based instruction; (4) Males obtained significantly more vocabulary knowledge than females under clickers-based instruction, while females obtained significantly more vocabulary knowledge than males under multimedia-based instruction.
Integrating Collaborative and Decentralized Models to Support Ubiquitous Learning
Authors: Barbosa Jorge Luis Victória , Barbosa Débora Nice Ferrari , Rigo Sandro José , Machado de Oliveira Jezer , Rabello Jr. Solon Andrade
Published: October 2014

The application of ubiquitous technologies in the improvement of education strategies is called Ubiquitous Learning. This article proposes the integration between two models dedicated to support ubiquitous learning environments, called Global and CoolEdu. CoolEdu is a generic collaboration model for decentralized environments. Global is an infrastructure designed to create ubiquitous learning environments. Global provides software agents that perform tasks common to ubiquitous learning processes. By extending these agents or adding new ones, a system can be specialized to support ubiquitous learning environments. The CoolEdu/Global integration created a collaborative and decentralized ubiquitous learning environment. The resulting environment was evaluated through a simulated scenario dedicated to explore its functionalities. The results were encouraging and showed the potential of deploying the environment in real situations.
An Investigation of Logistical Service in Franchising System
Authors: Allègre Thierry , Fulconis François , Paché Gilles
Published: October 2014

In the past forty years, the franchising system has undergone a remarkable expansion, notably in France, retaining more and more the attention of economy and service management researchers. A recurring question relates to the sources of competitive advantage that a franchise network may have. This paper intends to contribute to the debate based on the fundamentals of the resource/competence-based view, and applying the reflection to the case of the logistical service. Based on a case study driven within a franchise network, it is possible to conclude that the supply chain competences of a franchisor play an important role in the level of perceived satisfaction of franchisees when customised solutions are proposed thanks to information technologies.
Performance Analysis of Linear Permanent Magnets Synchronous Motor by Scalar Control Method (v/f)
Authors: Otkun Özcan , Doğan R. Özgür , Akpinar A. Sefa
Published: October 2014

This study is conducted to improve the performance of Linear Permanent Magnet Synchronous Motor by using Scalar Control Method. To do this, open and closed loop control methods are used. The study is modeled with MATLAB / SIMULINK. Firstly, the Simulink model has been developed by using equations dq axis system of the motor. Then, a scalar control method is modeled. Thirdly, open and closed loop control forms are modeled. From these models, current, thrust force, and speed graphs were obtained. It is seen on the graphs, the motor's closed loop PID control at scalar control method provide positive results.
Preparation Technology and Mechanical Properties of Al-6Zn-2Mg-2Cu Aluminum Alloy
Authors: Yang Lin , Wang Si Ni , Lin Li , Wu Wei , Chen Li Jia
Published: October 2014

The combination of atomization and smelting fabricated high strength Al-6Zn-2Mg-2Cu alloy. Microstructure was observed and analyzed by optical microscopy and SEM. The alloy featured with refined grains and even distribution. After being solution treated at 475°C for 1.5h, following multi-pass rolling with total reduction of 33% and aging at 120°C for 40h, the yield strength was 592MPa, peak stress of 597MPa and elongation of 12.2%.
Boosted Features for Face Authentication
Authors: Hanafi M. , Adnan W.A.W.
Published: October 2014

Boosted features developed using face signatures in combination with Gentle Adaboost algorithm offer alternative features for face authentication and face recognition. Face signatures are face representations extracted from Trace transform and Gentle Adaboost is used to enhance the performance of the features extracted from the face signatures. In this paper, we demonstrate the usefulness of the constructed features with experiments on BANCA database.
Development of Thermal Insulation from Oil Palm Fiber for Chimney of Fire Tube Steam Packaged Boiler
Authors: Hassan Suhaimi , Al-Kayiem Hussain Hamoud , Ghaffari Abuzar
Published: October 2014

In this study, an investigation was conducted to develop oil palm fiber from palm oil mill waste as a thermal insulator. The experimental study focused on comparisons of thermal conductivity and temperature gradient or difference between the existing commercial rockwool and the produced oil palm fiber as a thermal insulator for a chimney of steam packaged boiler. The experiments were conducted at different temperature ranges and packing density. The values of the measured thermal conductivity were found to be 0.02 W/m·K to 0.112 W/m·K for a packing density of 78, 96 and 112 kg/m3, and at a temperatures between 40 oC to 90 oC. The value of the thermal conductivity of the oil palm fiber showed an increase at higher temperatures and greater temperature gradient as compared to the rockwool insulator. Although not being able to match the values at higher temperatures and temperature difference, other factors such as the cost and the environmental benefits of using oil palm waste material should be taken into consideration and hence encouraging its use as at least a supplement to existing insulation materials.
Accurate Characterization of Raindrop Size on the Performance of Optical Wireless Communication Links
Authors: Kotiang Stephen , Choi Jae Ho
Published: October 2014

Rain attenuation is one of the impairments on the performance of optical wireless communication systems, and an accurate estimation of optical extinction coefficient due to rain in an area is an important factor for setting up a reliable communication link. In this paper, a relationship between optical signal attenuation and rain intensity is derived based on the moment of method of raindrop size distribution using a three-parameter gamma model. Finally, analyticalresultsarecompared to those ofthe ITU-R model.
Interface-Based Medicare Billing Software Design
Authors: Ma Xing Cheng , Liu Yu Hua , Bao Pei Hua
Published: October 2014

Medical institutions and health care billing system is mostly independent of the hospital information system software, such as the presence of a heavy workload and inconsistent information due to the Hospital Information System would like to produce a secondary entry problems. Design of Medicare billing software based on the interface, is the fundamental solution to the problem. This paper describes a specific Medicare interface specification, implementation of information exchange with the medical center by the dynamic link library functions, including the structure and format of the input and output parameters of the library function call, as well as medical insurance information processing flow. Select Delphi as a development tools, the definition of the interface specification stored in arrays, Achieve various Medicare functions of the Medicare interface specification with custom functions. A Medicare billing software system is completed with Medicare directory information management, Medicare card information management, Medicare fee settlement management, and the other Medicare functions.
Effect of Furfural on Structure and Charring Properties of Phenolic Resins
Authors: Yang Feng Ling , Liu Guo Qi , Li Hong Xia , Yang Wen Gang , Yu Jian Bin , Qian Fan , Ma Tian Fei
Published: October 2014

In order to improve the coke residue of phenolic resins (PF), different solvents were used in the present work. The research indicates that in comparison with other solvents, such as ethylene glycol (EG) and ethyl silicate (ES), furfural (FF) can enhance crosslinking density and increase residual coke yield of phenolic resins (PF). The results demonstrate that the residual coke yield of PF with furfural is 68 % higher than that with other solvents. In addition, pyrolysis peak temperature of PF with furfural is relatively high and pyrolysis process is more smoothly. FTIR results show that new bonds formed in PF when take furfural as solvent, and furfural changed the structure of phenolic resins. Raman spectra analysis results show that the order degree of the carbonized products (treated at 800 °C) is higher than that in other solvents, and stability of the carbonized products is improved. The research concludes that the type of solvent has great influence on the structure and coke residue.
Three-Dimensional Pattern Blending Design of Five-Surface Plane Developed Drawing
Authors: Jia Qi , Lv Xu Liang , Xu Wei Dong , Hu Jiang Hua , Rong Xian Hui
Published: October 2014

The blending effect of design pattern of five-surface plane developed drawing is important to the design pattern. The blending of three-dimensional pattern design can realize the automation of pattern design. The target pattern design of air brushing is based on the square design picture. Therefore, the effect is bad, especially in the edges between surfaces. Edge processing method is developed to solve this problem. The pixels are compressed in accordance with the image pixel compression method. According to the processing steps, the computer programming is performed. The results shows that, the floral drawing in the blending design figure can extend to the adjacent surfaces naturally, and the blending effect is great after the three-dimensional blending perform.
Design and Implementation of an Interleaved Boost DC-DC Converter for PEM Fuel Cells
Authors: Somkun Sakda , Sirisamphanwong Chatchai , Sukchai Sukruedee
Published: October 2014

This paper elaborates a design and implementation of a 2-phase interleaved boost DC-DC converter as the power conditioning circuit for PEM fuel cells. The converter ripple current is analyzed so as to determine the inductance value, which would draw the fuel cell ripple current less than 4 % of its nominal value for a longer lifetime and efficient operation. Compact design is benefited from reduced inductor core volume due to paralleled connection as well as microprocessor-based control. Practical implementation is also discussed. Selection of simulation and experimental results is presented to validate the design methodology. The converter has the maximum output power of 1 kW at the output voltage of 120 V with the efficiency better than 92 %.
The Study on 24 Bits ADC's Acquisition Dynamic Range Extension Method
Authors: Hu Xing Xing , Teng Yun Tian , Wang Xi Zhen , Li Cai Hua , Fan Xiao Yong
Published: October 2014

The seismic signal’s amplitude span is very large, the dynamic range of the observed signal even more than 160dB, so the broadband seismometer output dynamic range should be above 150dB. However, the 24 bits acquisition units usually used, which based on ΣΔ Analog to Digital chip, the dynamic range is just around 130dB. As a result, the acquisition unit can’t resolve the useful signal from tiny earthquake, and when the big earthquake happened, the acquisition unit shows amplitude limiting phenomena. In this paper, we will introduce a method which using two 24 bits ADCs in acquisition unit to extend the dynamic range. That means using one ADC with higher resolution to acquire small signal, and using one ADC with lower resolution to acquire large signal, get the full record of the data. In the end, we combine two acquired data as one 32 bits conversion data. After testing, the dynamic range of experimental prototype used this method reached 155dB＠50SPS.
FPSO Underwater Mooring Line Breakage Analysis Based on Broken Wire Material Test
Authors: Xu Zhi , Wang Yu
Published: October 2014

More broken wires was found in No.3 mooring line of "Hai Yang Shi You115"FPSO by the underwater detection. Through the chemical composition analysis, mechanical property testing, fracture analysis, metallographic examination methods, the reason of the broken wire are obtained. The results show that the material of mooring line steel cable mechanical performance is general up to the design spcifications. The broken wire fracture is relatively serious wear and all the sent samples of the present wear trace shape is consistent. It should be the same kind of wear the way by damage and reduced the steel wire tensile strength, lead to fracture.
Shape Memory Alloy Applications in Bone Fixation: State of the Art
Authors: Hassan Mohd Roshdi , Haw Yong Thian
Published: October 2014

Shape Memory Alloy (SMA) can transform its shape back to its original shape when subjected to a thermomechanical process. Applications of SMA in the bone fixation have been successful due the material’s ability to exhibit Shape Memory Effect (SME) as well as biocompatibility. A good design of bone fixation device made of SMA is capable of exerting a constant compressive force to the bone fracture while remains inert to the environment inside the host’s body. This study presents the application of SMA in bone fixation devices. These include SMA suturing devices, OSStaple, SMA patellar concentrator and SMA embracing fixator.
Hot Compression Deformation Behavior of Mg-Gd-Y-Zn-Zr Alloy
Authors: Lu Guang , Xie Zhi Ping , Zhang Zhi Min , Yang Yong Biao , Li Bao Cheng
Published: October 2014

The deformation behaviors of as-cast Mg-11Gd-2Y-Zn-Zr magnesium alloy were investigated by compression test with Gleeble-1500 thermal simulator at temperature of 623-753K and strain rate of 0.01-0.5 s-1. The flow stress behaviors of the magnesium alloy were carried out at a strain of 0.7. The strain rate and deformation temperature had great influence on the flow stress behaviors. The flow stress increases with increasing strain rate and decreasing temperature. The flow stress has more than one peak stress at a strain rate of 0.5s-1showing continuous dynamic recrystallization (DRX) mechanism, while other flow stresses exhibited only one peak stress indicating discontinuous dynamic recrystallization (DDRX) mechanism. It was also found that the ﬂow stress behavior could be described by the hyperbolic sine constitutive equation, in which the determined average activation energy is 273.426 kJ·mol-1. The maximum error value between calculated value and experimental value is 5.5%. The deformation map was also established, and the best parameter for hot working was found to be 0.1s-1/753k approximately.
Influence of Deformation of the Wheel Disk-Type Body on the Tooth Load Distribution over the Facewidth in Helical Gears
Authors: Krasiński Maciej
Published: October 2014

The article demonstrates one of the ways to reduce uneven load distribution along the width of the gear wheels which can be used in place of expensive modifications of the tooth flanks (crowning). This can be achieved by appropriate selection of the shape of the gear wheels for example the disk shape. The presented numerical example illustrates the above possibility taking into account deformability of the wheel body.
A Framework for Experimental-Numerical Analysis of Woven Laminates Failure
Authors: Mohd Zairil Hafizi Mohd Zailani , Muhamad Irwan Mohd Din , Zurri Adam Mohd Adnan , Mahmud Jamaluddin
Published: October 2014

Woven composite laminates have been widely used in various application and rapidly replacing unidirectional composite laminates. Thus, it is vital to understand clearly their material parameters and characteristic. Apparently, it is very difficult to analyse the design parameters of a unidirectional composite laminate, and thus due to its weaving structure, analysing numerically the parameters of a woven composite laminate is even more difficult. Therefore, this paper aims to review the work related to woven laminates with respect to its testing and simulations. During the initial stage, a tensile test is conducted according to ASTM D3039 on the 2×2 twill weave carbon fibre woven prepeg where the material constants (E1, E2, G12 and ν12) and the deformation behaviour will be obtained. The later stage will involve the development of a finite element modelling and simulation by means of commercial finite element package ANSYS 14.0 to replicate the experimental set-up. Ultimately, the outcomes and findings between the experimental and numerical approaches will be compared and reported.
Takeoff Performance Analysis Based on Aeroengine EGT Trend Monitoring and Control
Authors: Qiang Fu , Ding Fan
Published: October 2014

Exhaust gas temperature (EGT) is an important parameter for aeroengine. By monitoring the change in trend, can effectively predict the engine take-off performance. The characteristics of takeoff EGT were introdeced firstly. Two methods of estimating takeoff performance were analyzed subsequently. According to the statistical data, EGT can be used for takeoff performance prediction.
Nonlinear Analysis of 220 kV Power Transmission Tower and Gradient Optimization
Authors: Zhang Xiao Zhi , Wang Xiao Wei
Published: October 2014

To meet the needs of the economic development, the transmission power, which is the key part of Power transmission and transformation system engineering , needs to be improved on quality and quantity. Yet the design method of the transmission power has not been improved today. The outdated way of designing has many disadvantages. They don’t benefit to carry out the work of making the transmission power, and they have an enormous influence on the quality and production cost as well. Therefore, optimizing the structure, reducing the consumption of steel and improving the design level is of great significance. This article mainly uses SAP2000Nonlinear analysis of transmission tower after dao heng gradient optimization in engineering software thus reducing the consumption of steel and it can be used as a reference in a real project.
Fine Damage Identification Method of Transmission Tower Based on Concurrent Multi-Scale Modeling
Authors: Liu Chun Cheng , Hou Shang Yu , Li Wen Qiang , He Zhao Wen
Published: October 2014

In order to study the damage problem caused by the transmission tower fatigue cracks and bolt pretightening force loss ,this paper proposes a transmission tower damage identification method based on concurrent multi-scale model, namely establish solid model on nodes of fatigue crack and bolt looseness based on large scale model., subdividing elements size. Take a practical engineering 500kV transmission towers as an example to establish a concurrent multi-scale models. This paper simulates 8 kinds of conditions including bolt pretightening force loss and angle steel crack, research shows that the sum of wavelet packet energy curvature difference can effectively identify minute damage, and then get the function relation between damage level and damage index with no noise interference, also this provides a theoretical basis for it as actual damage monitoring indicators index.
The Development of Prefabricated Concrete Structures
Authors: Liu Shi Bin , Duan Lei
Published: October 2014

This Prefabricated concrete structures have low carbon environmental protection, short construction period and engineering quality controllable feature. With the engineering background of a nine prefabricated concrete frame structure, the author established the numerical model using structural nonlinear software SNAP, and using different Peak acceleration EL Centro wave Taft wave, and Shanghai artificial SHW2 wave time history analysis. Get the angular displacement between the layers of the structure drift angle between structural. Less than the limit prescribed in the "Seismic Design".
Architecture for a Novel STEP-NC-Compliant CNC System
Authors: Zhang Yu , Bai Xiao Lan
Published: October 2014

The open, intelligent and integrated CNC systems have been increasingly demanded with the development of manufacturing. In this paper, derived from requirements analysis, the architecture for a novel open, intelligent and integrated CNC system based on STEP-NC and PMAC is proposed. In the architecture, STEP AP-238 is selected as the NC data, which meets the requirements of the openness of NC data. Then, the open master-slave hardware structure based on IPC+PMAC with double CPUs is designed, which meets the requirements of the flexible hardware. Also, the open and modular software structure is designed, which meets the intelligent function requirements. In addition, the work flow of the CNC system is discussed. It turns out that the architecture presented provides a feasible solution to implement the open, intelligent and integrated CNC system.
An Increment-Type Multi-Step Predictive and Multi-Step Control Algorithm of Single-Variable Systems
Authors: Jiang Zhong
Published: October 2014

In this paper, an increment-type multi-step predictive and multi-step control algorithm of single-variable systems based on Laguerre function approximate model is presented, and then the stability of this algorithm is analyzed. Additionally, simulation of this algorithm had been done to investigate performance, the results show that the controlling quality of this algorithm is fairly good.
Application of Fibonacci Method in Amending Bidding Strategy for Hydropower Plant
Authors: Wang Jiang , Lu Ja
Published: October 2014

Based on solving maximum income model of hydropower plant and forming original bidding strategy, this paper used price coefficient to amend the original bidding strategy. Then it used the fibonacci method to obtain. Finally, it found the best stragety. The proposed stragety can coordinate the consumption of water in various period、 the relationship between water and quotation, it meet the constraint of water availability of plant and realize its optimal operation in the form of output-bidding, it also avoided the waste of water, then it insured the maximum income of the plant. Finally, a concrete example is given in detail to validate the practicability of the model and algorithm
Research on Protection Distance of 500kV Arrester
Authors: Qiu Hui Min , Bie Rui
Published: October 2014

In this paper, an estimation of protection distance of 500kV arrester is given, and a simulation experiment is proceeded to study the protection distance of 500kV arrester. So far, there is no relevant standard reported on the protection distance of 500kV arrester at home and abroad . By the studying, recommended values of the protection distance of 500kV arrester can be suggested. The research in this paper can also provide references to installation of arresters and the data obtained is valuable for research in this field.
Dynamics Influence of Joints with Clearance on Complex Mechanism
Authors: Liu Can , Shen Shan Shan , Zhang Chun Liang
Published: October 2014

The effects of joints with clearance between Crankshaft and cycloidal wheel on needle pendulum gear drive in 2K-V reducer are considered by Virtual Prototyping. A comparative analysis reveals angular velocity, acceleration change and the loading conditions of the input and output components. Joggle force between Crankshaft and cycloidal wheel are also analysized. It is a convenient way for stiffness design of 2K-V reducer.
Research on User Electrical Safety Monitoring System Based on Cloud Computing Technology
Authors: Zhu En Guo , Ge Lei Jiao , Zhong Xiao Qiang , Dong Li Jun
Published: October 2014

Electrical safety is a common goal of electricity customers and power companies. In order to meet the needs of different users for electricity safety, ensure the legitimate rights and interests of the State Grid Corporation and users, promote the service level of State Grid Corporation and improve the life quality of the users, an effective measures is the user electricity safety inspections. Firstly, it introduces the development of cloud computing technology and the advantages of the user electricity safety monitoring system based on cloud computing technology. Secondly, from three aspects of the system structure, function and cloud system, the user electrical safety monitoring system based on cloud computing technology has been elaborated. Lastly, it discusses the development of the lateral user electricity safety monitoring, and provides the reference for the application of user electricity safety inspections.
Complicated Super High-Rise Structural Model Conversion Technology
Authors: Zhang Xing , Cheng Qun
Published: October 2014

Abstract. With the development of building science and technology, there are more and more super high-rise buildings. Meanwhile, difficulties in structural design and construction are also on the rise. As the finite element technology field develops, there are numerous types of structural design software, with different mutual functional characteristics. In order to satisfy the design and construction calculation of large-scale engineering, formats of different structural models shall be converted frequently, so as to satisfy the demand of design and construction calculation. In this paper, a simple method will be sought for converting the finite element model of SAP2000 structural design into ANSYS finite element model based on super high-rise structural design model by combining the practical engineering. After conversion, simple APDL [1] programming can be applied for realizing the conversion technology of model.
A Structural XPath Query Expansion Approach Based on XML Schema in Publish Subscribe System
Authors: Pei Jun Bo , Gao Jin Chun , Liu Yuan An , Ma Xiao Lei
Published: October 2014

XML based publish/subscribe systems are on tremendous rise during recent years. In order to get interested documents, the subscribers submit an XPath Query. In such applications, there is often a mismatch between how publishers describe entities and how different subscribers express their interests. Lots of researches focus on filtering mechanisms, exists such as XFilter, YFilter, Afilter etc, but most of these mechanisms do not use the structural property of XML. This paper proposes an approach which dose XPath query expansion based on structural information. Firstly check query node in OWL classes and return semantically related data performing semantic normalized. Secondly, perform structural expansion depend on the XSD which set constraint on content published. Experiment results show that our approach performs well across a range of XPath queries and documents.
Extraction of Humanized Design in Industrial Design Application
Authors: Tong Yu Qin
Published: October 2014

Along with the social development and the improvement of people’s living standard people not only focus on products’ use value, and but also pay more and more attention to products’ added value, emotional value, aesthetic value and individual value, namely people have higher demand on humanization. In the contemporary industrial design, humanized design is getting more and more attention. So we study the application of humanized design in industrial design not only has theoretical significance, also has the very important guiding significance.
Numerical Simulation of Secondary Flow in a Curved Square Duct
Authors: Zhang Li Jian , Zhang Wen Ping , Ming Ping Jian
Published: October 2014

The present paper focused on both turbulent flow and laminar flow at low Reynolds number in a curved duct. The finite volume method on unstructured grid and SIMPLEC algorithm were adopted here and the computation program was design with these methods. Good agreement was achieved between the numerical result and experimental data in the literature, and it shows that the method is reasonable and the program works well. The numerical method was also used to flow simulation with different attack angle and side angle, and numerical results were consistent with conclusion in the literature. Finally, the numerical method used for cases with different Reynolds number at the inlet. Secondary flow phenomena have been researched in the curved duct and some conclusions were derived.
Design and Kinematics Analysis of Planetary Sampling Manipulator with Lightweight
Authors: Sun Xiao Xiao , Zhang Bing Wei , Liu Jia Ju , Chen Qiao
Published: October 2014

To reduce launching load of rocket and power consumption of rover, design of sampling manipulator was proposed which was lightweight, low-power consumption and multifunctional. Stability principle of triangle was used to comprise stable structure between robotic arm and locking device. And the weight of planetary rover was effectively reduced and its energy efficiency was greatly improved by combining manipulator and mast lifting stereo camera into one. Forward and inverse formulas were built by using D-H method and Robotics Toolbox was used for kinematics simulation. The simulation results indicate that the design of samping manipulator is reasonal which meets the purposes of lightweight and low power consumption.
Local Modal Space Control Design for a 6-DOF Parallel Manipulator
Authors: Tian Ti Xian , Jiang Hong Zhou , He Jing Feng , Tong Zhi Zhong
Published: October 2014

A novel design method for modal space controller with dynamic pressure feedback is proposed for hydraulically-driven Stewart platforms. By exploiting properties of the joint-space inverse mass matrix, an analytic modal matrix is derived which can be used for transforming the highly coupled multiple-input multiple-output (MIMO) dynamics into six independent single-input single-output (SISO) channels in modal space. Based on classical control method, the modal space controller with dynamic pressure feedback is implemented and used to broaden the bandwidth of each channel in modal space separately. The effectiveness of the proposed method is examined through experiment.
Cold Spray Technology for Light Metals and Porous Structures
Authors: Hamweendo Agripa , Botef Ionel
Published: October 2014

Studies show that, for viable product realisation and maintenance, a spectrum of novel processing technologies and materials to improve performance and reduce costs and environmental impact must constantly be addressed. One of these technologies, namely the cold spray process has enabled a broad range of coatings and applications, including many that have not been previously possible or commercially practical, hence its potential for new light metal applications. Therefore, the purpose of this paper is to highlight some advantages of this technology and explore how the cold spray process could be used to repair light metal unserviceable components and develop new light metals including light metal porous structures.
Process Models for Press-and-Sinter Titanium
Authors: Blaine Deborah C. , Bosman Hendrik L. , Laubscher Heleon H.
Published: October 2014

Two commercially pure (CP) titanium powders, with mean particle sizes of 78 and 32 μm, respectively, were used to manufacture titanium samples via the press-and-sinter powder metallurgy process. Compaction pressures ranging from 300 to 500 MPa were used to compact the powders into cylindrical and rectangular forms. The green samples were sintered for 2 hours under high vacuum, 10-6 mbar, at 1100, 1200 and 1300 °C, respectively. Green density and green strength data were collected from the compacted samples, and sintered density, sintered strength and microstructure images were collected from the sintered samples. These data were used to characterise process models for the compressibility of the powders, and for the sinter densification, using the Master Sintering Curve (MSC) model. The results show that particle size influences the processing at both the compaction and sintering step. In modelling these two processes, separate MSC models must be characterised and each used individually to predict each one’s final sintered density. It is shown that if the densification parameter is used to characterise the sintering model, a unified Master Densification Curve (MDC) is found. The modified MDC model can be used to predict the final sintered density regardless of the initial green density or mean particle size of the powder.
Establishing the Optimal Process Parameters for the Laser Sintering of Ti64 for Layer Thicknesses of 15 μm and 30 μm and Validation of a Melt Pool Simulation Model
Authors: Els Johan , Truscott Michele , van der Walt Kobus , Booysen Gerrie
Published: October 2014

Direct Metal Laser Sintering (DMLS) is a layer-by-layer Additive Manufacturing (AM) process that creates physical metal parts from three dimensional Computer Aided Design (CAD) data. For DMLS to be generally accepted by industry as a manufacturing technology, high mechanical integrity of final components needs to be demonstrated. Mechanical properties of manufactured components are directly affected by the quality of each individual laser sintered track of each consecutive layer. In this study, the optimal ratio of laser power and scanning speed on single tracks is determined for Titanium-6Al-4V powder on an EOSINT M270 DMLS machine for a layer thickness that varies between 15 μm and 30 μm. Two different laser powers, namely 150 W and 170 W were considered. Scanning speeds varied between 600 mm/s to 2000 mm/s with 200 mm/s intervals. The most stable tracks resulted from high laser power, slow scanning speed and thin powder distribution. The empirical data were compared to a melt pool width prediction program, which was found to underestimate track width at all scanning speeds and re-melting depth at low scanning speeds. Further, it was found that decreased powder thickness can be used with an increased scanning speed and high laser power. This strategy may be used to increase surface quality. The penetration data during fusion of the tracks onto the building platform further validates the quality of each sintered track.
Influence of Process Heat Input on Static and Dynamic Properties of Friction Stir Welded 3mm Ti6Al4V Alloy
Authors: Mashinini Peter Madindwa , Hattingh D.G. , Lombard Hannalie
Published: October 2014

This paper presents an investigation on the influence of varying heat input during friction stir welding of Ti6Al4V alloy, with respect to static and dynamic joint integrity. Weld heat input was controlled by varying the rotational-and tool travel speed. In the absences of large defects the welded samples failed predominately in the parent plate, while percentage elongation for all welds was lower than that of the original material. To quantify the influence of joint geometry on dynamic joint integrity, the test samples were categorised into “as-welded” and “polished” conditions for ease of comparison. Welds done at medium heat input exhibited improved fatigue strength in both conditions, while crack initiation sites for the as-welded condition was predominantly from tool shoulder marks whereas the polished sample initiation sites could be mainly linked to subsurface defects in the weld nugget. The relationship between welding tool geometry, weld defects and-process parameters is also discussed in an attempt to identify interrelationships that could be linked to joint integrity.
Austenite Grain Growth Kinetics in a Low C-Mn Steel and a Ti-Nb-V Microalloyed Steel
Authors: Annan K.A. , Siyasiya C.W. , Stumpf W.E. , Banks K.M. , Tuling A.S.
Published: October 2014

The effect of thermal processing (TMP) parameters on grain growth in a low C - Mn steel and a C - Mn steel microalloyed with Nb, Ti and V were compared as part of a wider study on grain growth in microalloyed steels. The grain growth rate was found to be low at low temperatures and short soaking times but increases significantly with both increasing temperature and time. The activation energy Q, the grain growth equation constants n and A were found to be higher in the microalloyed steel than the plain C-Mn steel. A constitutive model for predicting austenite grain growth in the low C-Mn steel and the microalloyed steel has been developed. The predictive potential of the model is in good agreement with the experimental data.
The Effects of Natural Pre-Ageing Time on T6 Peak Hardness of R-HPDC 6xxx Series Alloys
Authors: Daswa Pfarelo , Möller Heinrich , Govender Gonasagren
Published: October 2014

This paper investigates the influence of natural pre-ageing time on T6 peak hardness of rheo-high pressure die cast (R-HPDC) 6xxx series aluminium alloys. Natural pre-ageing has a negative effect on the 6xxx series Al-Mg-Si alloys that contain higher quantities of Mg2Si (typically > 0.90%). However, a positive effect is observed in alloys with lower quantities of Mg2Si. The negative effect can be attributed to the clustering of solute atoms that form at room temperature because the precipitates which develop directly from clusters formed at room temperature are coarser than those developed in alloys artificially aged immediately after quenching. The opposite occurs in alloys where a positive effect of natural pre-ageing is found. The effects of the duration of natural pre-ageing on the subsequent T6 properties are of importance. In this study the T6 (190oC-4h) hardness values of various R-HPDC 6xxx series alloys were determined after natural pre-ageing times ranging from 0h to 3240 hours. Alloys that show either the positive or the negative effect of natural pre-ageing are used. This paper also compares the influence of natural pre-ageing time on Cu-containing and Cu-free alloys. The addition of copper to the 6xxx series aluminium alloys lessens the negative effect of natural pre-ageing in the higher strength alloys.

 
Al-Mg-Si-(Cu) 6xxx Series Alloy Selection for Rheo-High Pressure Die Casting
Authors: Möller Heinrich , Daswa Pfarelo , Govender Gonasagren
Published: October 2014

This paper investigates the selection process of Al-Mg-Si-(Cu) 6xxx series alloys when used specifically for rheo-high pressure die casting (R-HPDC). The 6xxx series alloys have been developed as wrought alloys and certain factors must be taken into consideration when utilising them for semi-solid metal processing. It is shown that chemical composition has a significant effect on the solution treatment parameters that should be employed i.e. high Cu and excess Si levels necessitate the use of a two-step solution treatment to reduce incipient melting. This incipient melting is especially severe in areas within the component where liquid segregation occurs, which is a common phenomenon in R-HPDC. However, high Cu and excess Si levels also have advantages: it results in higher T6 strength and Cu-additions have been shown to minimise the negative effects of natural pre-ageing. Therefore, the composition of the alloy must be selected in such a way as to achieve acceptable strength without the dangers of incipient melting in liquid segregated areas. Another important modification of 6xxx series alloys used for R-HPDC that is presented is the addition of Ti to minimise hot tearing.
Experimental Investigation on Grinding Temperature of Titanium Alloy
Authors: Hao Bing Jun , Dong Zhi Gang , Kang Ren Ke , Wang Huan , Cao Ke
Published: October 2014

Titanium alloy has been widely used in aeronautics and astronautics industry owing to its unique combinations of properties. The unique physical and chemical properties of titanium alloy make it a typical difficult-to-machine material. The elevated temperatures at the machining zones may cause thermal damage, residual stress and micro-structural changes in the surface layer of titanium alloy during grinding. In this study, grinding experiments were performed on the titanium alloy, and the grinding temperature was experimentally tested with the grindable thermocouples. The effects of the grinding parameters on the grinding temperature were analyzed. The grinding temperature rises with the increase of grinding speed and grinding depth.
Finite Element Simulation of Shearing Force in Disc Slitting Process
Authors: Shi Xian Jing , Yan Qiu Sheng , Lu Jia Bin , Zeng Jun
Published: October 2014

Based on the principle of disc slitting process, a 3D model of the disc slitting process for galvanized sheet was established by using DEFORM-3D software, and the deformation, fracture and material effective stress of galvanized sheet were analyzed. The surface morphology of numerical simulation is in good agreement with the actual result. The curve of shearing force was obtained and well matched with the change rule of slitting process. Compared with the theoretical calculation result, the simulation result is reliable and can provide a reference for the calculation of shearing force.
An Optimal Method of Tool Path Generation for Radial Sinusoidal Surface
Authors: Ji Shi Jun , Yu Hui Juan , Zhao Ji , Li Jin Chao , Liu Lei Lei
Published: October 2014

Tool path generation is an important part of ultra-precision manufacturing, and spiral tool path is one typical driving path. For single point diamond turning (SPDT), two methods are commonly used to generate the driving points on the spiral tool path, which are equally spaced angles and equally spaced arcs for two adjacent cutting points. But these two methods both have the defects for machining radial sinusoidal surface with SPDT. In this paper, the theoretical analyses of the two different methods are conducted and compared respectively. Then, an optimal method of generating the spiral cutting tool path is proposed on the base of theoretical analyses, which can avoid disadvantages of two original methods. The proposed method can enhance the machining accuracy and fabricating efficiency for ultra-precision machining of the radial sinusoidal surface with SPDT.
Dynamic Analysis of the Media in Centrifugal Barrel Finishing
Authors: Zhang Jian Li , Li Wen Hui , Yang Sheng Qiang , Jiang Qian , Liu Li Ping
Published: October 2014

The main effects in centrifugal barrel finishing result from the impact of the mutual impacts, the interaction of extrusion, the rotation shear and the sliding force, it can’t be calculated that the force created by the collision among the media and the velocity of the media at present. It is concluded that the velocity of the media is 5.107m/s through simulating the motion in EDEM, which is 2.28% error with theoretical calculation. Using orthogonal experiment to analyze different sizes and material media, it is concluded that media size mainly affects the tangential force, normal force and rolling friction.
Study of the Slurry in CMP 304 Ultra-Thin Stainless Steel Surface
Authors: Chen Jia Peng , Yao Jian Guo , Ma Li Jie , Fu Su Fang , Su Jian Xiu
Published: October 2014

Flexible displays will become the mainstream display of next generation, so the manufacturing technology of the flexible display substrate is one of very important technologies. In this paper, according to orthogonal design, the composition selection and optimization of chemical mechanical polishing (CMP) slurry based on alumina abrasive had been done in CMP ultra-thin stainless steel surface by a lot of tests. The CMP slurry based on alumina abrasive for ultra-thin stainless steel surface had been obtained. According to the test results, the material removal rate (MRR) is about 177 nm/min and the surface roughness (Ra) is about 0.018μm.