bluuebunny/crossref_metadata_2025 huggingface dataset:
Emerging Collaboration Routines in Knowledge-Intensive Work Processes
Authors: Sari Burak , Loeh Hermann , Katzy Bernhard R.
Published: November 2011

This article aims to identify how knowledge workers develop their own collaboration strategies and techniques for getting their work done in complex, dynamic knowledge intensive work environments. Three case studies have been conducted to explore the nature of routines in different collaborative working settings as they provide sufficient detail to better understand the actual state and problems regarding collaborative work processes among knowledge workers. Evidences from these cases show that coordination and control of projects, tasks, information, and little support by collaboration tools in all work patterns seem to be the biggest issues and there is a need for better understanding of collaboration culture as well as harmonious and integrated redesign of collaboration routines with new collaborative working environment technologies. The analysis of the cases also shows that there are considerable differences in ways of how actors communicate and coordinate their work which leads varying degrees of quality in knowledge intensive work. The results can be used to achieve a smoother collaborative working phase through innovative technical developments.
A Trade Value Perspective on Ecommerce Research
Authors: King Ruth C. , Sen Ravi , D’Aubeterre Fergle , Sethi Vikram
Published: November 2011

The impact of web-based electronic commerce on the process of disintermediation and re-intermediation has been extensively studied. Two major limitations of the existing work are the focus on a single economic measure (i.e., transaction cost minimization) and the examination of channel-structure decisions from only a single perspective (the seller’s). This paper introduces transactional value theory in the context of channel-structure research and integrates it with transaction cost theory to generate a trade value framework. The trade value framework considers channel-structure decisions from the perspectives of both buyers and sellers and is used to analyze the impact of web-based e-commerce on intermediated channel-structures. The proposed framework suggests that intermediaries function best in a channel-structure if they can reduce trade-inhibiting factors and improve trade-enhancing factors. Intermediaries may also prosper if they deliver extraordinary value on one side of the trade value framework to the point that inhibiting factors on the other end of the trade can be overlooked. Intermediaries maximize the value of the trade for both the buyers and the sellers by trading through an intermediated channel-structure as opposed to trading directly.
Effects of e-CRM Value Perceptions on Website Loyalty
Authors: Jih Wen-Jang , Lee Su-Fang
Published: November 2011

Web-enabled customer relationship management, or e-CRM, holds the promise to simultaneously achieve the conflicting goals of strategic flexibility and operational efficiency in developing and executing innovative e-commerce marketing strategies. A new multi-disciplinary field involving such diverse areas as marketing, information systems, and consumer behavior, e-CRM seeks to strengthen customer relationship via a portfolio of trust-building practices with the support of powerful information technologies. While most literature in e-CRM has focused on how firms formulate and implement e-CRM initiatives, there is a dearth of literature on viewing the overall quality of an e-commerce firm’s e-CRM practices from the consumer point of view. This research proposes such a consumer-oriented concept, e-CRM value, based on existing e-CRM research literature and examines the effect of e-CRM value on website loyalty. It was found that customers’ perception of e-CRM value has a positive causal effect on their website loyalty. The implications of this finding for the theory-building of e-CRM and marketing practices of e-commerce firms are discussed.
Effects of Website Interactivity on E-Loyalty
Authors: Jih Wen-Jang , Lee Su-Fang , Tsai Yuan-Cheng
Published: November 2011

This study examines the impact of major considerations of commercial website design and management, website interactivity, the important performance factor, and customer loyalty. Meaningful interactions with existing and potential customers allow e-commerce firms to enhance customer loyalty by providing satisfactory customer experience. Customer loyalty is a composite construct, yet consists of multiple dimensions that do not necessarily contribute to repeat purchase in the same manner. Guided by the concept of social exchange in social psychology, this study investigates the causal effect of website interactivity on two conceptually distinctive types of website loyalty—transactional loyalty and relational loyalty. This paper finds positive effects of website loyalty on both types of loyalty, while revealing positive effects of transactional loyalty on relational loyalty and overall loyalty. Furthermore, relational loyalty is found to contribute more to overall loyalty than transactional loyalty. E-commerce firms are advised to offer attractive incentives in a systematical manner to gradually convert more temporary transactional loyalty to more long-term relational loyalty. Finally, firms must devise a portfolio of different marketing strategies to cater to the customers located on different points on transactional loyalty.
An Empirical Study of the Impact of Brand Name on Personal Customers’ Adoption of Internet Banking in Hong Kong
Authors: Cheng T. C. E. , Yeung W. H.
Published: November 2011

This study investigates whether brand name has an impact on personal customers’ adoption of Internet banking (IB) in Hong Kong. Based on the Technology Acceptance Model (TAM) with proper adaptation to the online environment, we propose a model comprising an external factor, namely brand name, and three constructs of technology adoption, namely perceived credibility, perceived usefulness and perceived ease of use to assess customers’ intention to use IB. In addition, we investigate the difference in the brand name’s effect on customers’ adoption of IB between banks with larger market shares and banks with smaller market shares. We collected data through a questionnaire survey and analyzed the data using structural equation modelling (SEM) to investigate the inter-relationships between the constructs and assess the overall explanatory power of the model. The results provided support for the model and confirmed its robustness in predicting the impact of brand name on personal customers’ adoption of IB in Hong Kong.
Digital Video Presentation and Student Performance
Authors: Raven Arjan , Leeds Elke , Park ChongWoo
Published: November 2011

This paper reports the results of a confirmatory study of a Task Technology Fit (TTF) model. Three dimensions of fit: Task Match, Ease of Use, and Ease of Learning, are applied in the context of digital video tools use for oral presentation in a classroom environment. Students completed a digital video presentation that acted as a substitute for an in-class oral presentation. An existing survey instrument was adapted, and administered to the students to examine the impact on presentation skill and fit to task. Results confirm the adaptation of the TTF model and show significant relationships between variables. The model can be used in other task/technology combinations. Additional findings suggest that when there is a significant fit between digital video tools (technology) and improvement of oral presentation skills (task), student performance also improves. Digital video can be a useful alternative to in-class presentation when the goal is to improve presentation skill.
Evaluating Faculty Teaching of Research Methodology to Undergraduate Geography Students in a Nigerian University
Authors: Ololube Nwachukwu Prince , Ubogu Andrew Egba , Egbezor Daniel Elemchukwu , Nwachukwu Ugbomah
Published: November 2011

The effective ways of teaching research methods to students is a process closely connected to socializing students towards writing an effective research project before graduation and determines how successful and effective they are in conducting individualized research. Several factors apart from setting up a successful learning community are essential, but competencies determine faculty effectiveness. This paper appraises students’ evaluation of faculty (SEF). It evaluates students’ perception of competencies required by faculty in teaching research methodology to undergraduate geography students at the Ahmadu Bello University in Nigeria. Using a questionnaire to gather data for the study, the paper argues that by evaluating the performance of faculty members, their knowledge, expertise, skills, and by applying certain adaptation mechanisms in teaching, the experience and effectiveness of teaching students’ research methodology can be significantly improved. The authors use this medium to encourage colleges and universities, education planners and policy makers in Nigeria of the need to introduce and carry out SEF along side other evaluation techniques in determining faculty performances and effectiveness.
User Interface Design Pedagogy
Authors: Khoo Benjamin K.S.
Published: November 2011

A major limitation in traditional class lectures that uses textbooks, handouts, transparencies and assignments is that students often are unable to “experience” user interface design. This limitation can be overcome by using the constructionist approach that allow students to experience user interface design by allowing them to “do” or “construct” so that they can understand and remember. This paper describes an Internet-based interactive case scenario that was developed, based on the constructionist approach, to teach students user interface design concepts in conjunction with the Questionnaire for User Interaction Satisfaction (QUIS). A proof of concept evaluation was conducted and the results indicate that this approach is effective in user interface design pedagogy.
An Evaluation of Use of Multimedia Case Studies to Improve an Introduction to Information Technology Course
Authors: Sankar Chetan , Clayton Howard
Published: November 2011

For college graduates to be successful in today’s global economy there has been an increasing demand for them to possess business knowledge as well as technical knowledge. To meet the demand, curriculum designers have sought to integrate new technologies, applications, data, and business functions into classrooms so that non-information technology (IT) majors can realize the benefits of IT. This paper discusses the results of research conducted on the use of multimedia case studies to address the curriculum designers’ challenge. The authors have found that students, who are taught using multimedia case studies, perceived a comparatively greater improvement in their higher-order cognitive skills, ease of learning, team working skills, attitude toward information technology, and self-efficacy. This suggests a need for further research into adopting such instructional materials for teaching non-IT majors and for developing other innovative instructional materials.
Investigation into Gender Perception toward Computing
Authors: Laosethakul Kittipong , Leingpibul Thaweephan , Coe Thomas
Published: November 2011

A potential explanation for the decline of female participation in computing-related education and careers in the United States is the perception that computing is for males. In this regard, declining participation limits diversity in the IT workforce. Therefore, this paper investigates the impact of two psychological factors, computer anxiety and computer self-efficacy, on gender perception toward computing between American male and female students. The authors also investigate whether the same relationship is found in India, where, while computing is dominated by males, female participation is rapidly increasing due to global IT outsourcing.
The Role of Computer-Mediated Communication
Authors: Olaniran Bolanle A. , Rodriguez Natasha
Published: November 2011

The use of information technology to enhance classroom learning and deliver corporate training is the latest trend and focus of much research in the computer-mediated communication (CMC) and development industry. Technological advances continue to alter the various ways in which academic and organizational training is facilitated and conducted. This paper presents a review of the available literature and trends in CMC, specifically, CMC’s theoretical approaches, types/roles, benefits/disadvantages, and contributions to academic institutions and corporate organizations. The authors also provide a discussion of future trends and implications in this subject.
Mining Frequent Generalized Patterns for Web Personalization in the Presence of Taxonomies
Authors: Giannikopoulos Panagiotis , Varlamis Iraklis , Eirinaki Magdalini
Published: November 2011

The Web is a continuously evolving environment, since its content is updated on a regular basis. As a result, the traditional usage-based approach to generate recommendations that takes as input the navigation paths recorded on the Web page level, is not as effective. Moreover, most of the content available online is either explicitly or implicitly characterized by a set of categories organized in a taxonomy, allowing the page-level navigation patterns to be generalized to a higher, aggregate level. In this direction, the authors present the Frequent Generalized Pattern (FGP) algorithm. FGP takes as input the transaction data and a hierarchy of categories and produces generalized association rules that contain transaction items and/or item categories. The results can be used to generate association rules and subsequently recommendations for the users. The algorithm can be applied to the log files of a typical Web site; however, it can be more helpful in a Web 2.0 application, such as a feed aggregator or a digital library mediator, where content is semantically annotated and the taxonomic nature is more complex, requiring us to extend FGP in a version called FGP+. The authors experimentally evaluate both algorithms using Web log data collected from a newspaper Web site.
Dimensionality Reduction with Unsupervised Feature Selection and Applying Non-Euclidean Norms for Classification Accuracy
Authors: Saxena Amit , Wang John
Published: November 2011

This paper presents a two-phase scheme to select reduced number of features from a dataset using Genetic Algorithm (GA) and testing the classification accuracy (CA) of the dataset with the reduced feature set. In the first phase of the proposed work, an unsupervised approach to select a subset of features is applied. GA is used to select stochastically reduced number of features with Sammon Error as the fitness function. Different subsets of features are obtained. In the second phase, each of the reduced features set is applied to test the CA of the dataset. The CA of a data set is validated using supervised k-nearest neighbor (k-nn) algorithm. The novelty of the proposed scheme is that each reduced feature set obtained in the first phase is investigated for CA using the k-nn classification with different Minkowski metric i.e. non-Euclidean norms instead of conventional Euclidean norm (L2). Final results are presented in the paper with extensive simulations on seven real and one synthetic, data sets. It is revealed from the proposed investigation that taking different norms produces better CA and hence a scope for better feature subset selection.
Exploring Disease Association from the NHANES Data
Authors: Xing Zhengzheng , Pei Jian
Published: November 2011

Finding associations among different diseases is an important task in medical data mining. The NHANES data is a valuable source in exploring disease associations. However, existing studies analyzing the NHANES data focus on using statistical techniques to test a small number of hypotheses. This NHANES data has not been systematically explored for mining disease association patterns. In this regard, this paper proposes a direct disease pattern mining method and an interactive disease pattern mining method to explore the NHANES data. The results on the latest NHANES data demonstrate that these methods can mine meaningful disease associations consistent with the existing knowledge and literatures. Furthermore, this study provides summarization of the data set via a disease influence graph and a disease hierarchical tree.
Constrained Cube Lattices for Multidimensional Database Mining
Authors: Casali Alain , Nedjar Sébastien , Cicchetti Rosine , Lakhal Lotfi
Published: November 2011

In multidimensional database mining, constrained multidimensional patterns differ from the well-known frequent patterns from both conceptual and log­ical points of view because of a common structure and the ability to support various types of constraints. Classical data mining techniques are based on the power set lattice of binary attribute values and, even adapted, are not suitable when addressing the discovery of constrained multidimensional patterns. In this chapter, the authors propose a foundation for various multidimensional database mining problems by introducing a new algebraic structure called cube lattice, which characterizes the search space to be explored. This chapter takes into consideration monotone and/or anti-monotone constraints enforced when mining multidimensional patterns. The authors propose condensed representations of the constrained cube lattice, which is a convex space, and present a generalized levelwise algorithm for computing them. Additionally, the authors consider the formalization of existing data cubes, and the discovery of frequent multidimensional patterns, while introducing a perfect concise representation from which any solution provided with its conjunction, disjunction and negation frequencies. Finally, emphasis on advantages of the cube lattice when compared to the power set lattice of binary attributes in multidimensional database mining are placed.
Synthesis of Styrene-Acrylic Emulsion for Aqueous Glazing Agent
Authors: Chen Kun , Xin Xiu Lan , Wei Ya Na
Published: November 2011

The water-based pigment ink jet emulsion whose particle size was less than 100nm was synthesized by the polymerization of methyl methacrylate, butyl acrylate and ethylhexyl acrylate, and anionic reactive surfactant and nonionic surfactant were used as the emulsifiers. The effects of particle size and water resistance were studied. The glass transition temperature was tested by differential scanning calorimetry. The average particle size of emulsion was range from 60nm to70nm, zeta potential value was less than -60mv; viscosity was 3.5mps; water absorption was 5.9%.
Research on the Quality of Screen Printing Based on the UV Ink
Authors: Zhang Gai Mei , Deng Pu Jun , Xu Wen Cai , Yu Zhi Qiang
Published: November 2011

With the development of the green inks, UV ink has been applicated wider and wider in the printing, packaging and the electronics industry. Based on the UV inks and screen printing process, this paper has investigated the influnce of mesh count, screen ruling, printing materials and ink viscosity on print quality by measuring the printing dot gain experimentally. The results show that the higher mesh count and more smooth printing material can induce the better dot, tone reproduction and higher printing precision. The more serious dot gain and the worse tone reproduction will induced by lower ink viscosity. The higher screen ruling cause the bigger dot gain value. Bigger rate of mesh count with screening ruling can reduce the moire phenomena.
Effect of Cationic Polyacrylate Emulsion Properties on Paper Coating Properties
Authors: Li Jin Li , Liu Quan Xiao , Xu Wen Cai , Lv Yu Bin
Published: November 2011

Cationic polyacrylate emulsions with different properties were prepared in lad and used as surface sizing agent, the results showed that as the increase of solid content, the properties of paper increase at first but keep constant if the solid content increase further; as the increase of the pH value of the emulsion, the strength of the paper decrease, smoothness increase, gloss and whiteness decrease, saturation and printing density increase; the increase of the size of emulsion has adverse effects on the properties of the paper, so the size should not be too large; the viscosity should not be too large and not be too low, it should be kept in a moderate level.
Evaluation Accepted Small Color-Difference Samples by Using High Glossy Ink-Jet Paper
Authors: Liang Jing , Liao Ning Fang , Lian Yu Sheng , Wang Yuan Yuan
Published: November 2011

In order to study the human color vision characteristics, the small color-difference discrimination threshold experiment at the 17 basic CIE color centers of high range of gloss color printed samples. A panel of 10 observers with normal color vision performed the visual assessment to 510 pairs of samples using admissibility method. The evaluation data of visual color-difference were obtained in CIELAB color space. The detailed comparision indicated that the data were used evaluate the four common color-difference formula, CIELAB, CIE94, CMC and CIEDE2000. The detailed analysis indicated that CIELAB recommended by CIE Performanced the best among the four modern color difference. For predicting very small color datas. The experimental data provides references for the improvement of uniform color space and color-difference formula.
Study on Scratch-Resistance and Abrasion-Resistance of Water-Based Varnish
Authors: Zhao De Ping , Liu Jiang Hao , Huang Bei Qing , Wei Xian Fu
Published: November 2011

To improve scratch-resistance and abrasion-resistance of water-based varnish, change the type of water-based resin, the type and content of wax emulsion and flow agent, then test scratch-resistance and abrasion-resistance of water-based varnish. The results show that resin and wax emulsion has a great influence on the scratch-resistance and abrasion-resistance of water-based varnish. Adding appropriate amount of wax emulsion can improve scratch-resistance and abrasion-resistance to some extent. Adding flow agent has certain influence on scratch-resistance of water-based varnish.
Synthesis of Side-Chain Liquid Crystal Polymers and Preliminary Studies of the Property of Photo-Alignment
Authors: Zhao Yu Lei , Zhang Wei Min , Li Ji Lei , Pu Jia Ling
Published: November 2011

Two kinds of photo-crosslinkable polymers with a coumarin-containing and cinnamate-containing side group were synthesized in this paper. The structure of the intermediates, monomers and polymers were characterized with FTIR and 1HNMR measurement. Differential scanning calorimetry (DSC), hot stage polarized optical microscopy (POM) were employed to study the phase-transition temperature, mesophase texture. UV-VIS spectrophotometer was used to survey the ultraviolet absorption performance of the polymers. The results showed that the monomer with cinnamate group showed nematic phase and smectic phase over a wide temperature range. What’s more, the ultraviolet absorption peak of the polymer with cinnamate group was at about 285 nm, and the ultraviolet absorption peak of the polymer with coumarin group was around 311.00 nm.
Preparation of a Self-Crosslinking Resin System at Ambient Temperature
Authors: Wang Tang Wei , Li Zhong Xiao , Lu Hua Sheng , Pu Jia Ling
Published: November 2011

A reversible addition fragmentation chain transfer (RAFT) agent, 2-(dodecylthiocarbonothioylthio)propanoic acid (RAFT-1), was synthesized and characterized. Diacetone acrylamide and poly(ethylene glycol)methyl ether methacrylate were polymerized in the presence of RAFT-1 to give an amphiphilic polymer(RAFT-2). A very stable and narrowly-distributed emulsion was obtained by the micellization of the amphiphilic polymer in water. The self-crosslinking resin system was prepared by adding a crosslinker (adipic dihydrazide) to the prepared emulsion. Upon the evaporation of water of the emulsion, a tough and transparent crosslinked film was prepared, which had good water/solvent resistance and certain adhesiveness.
Synthesis and Property of Polymerizable Sodium Sulfosuccinic Diester
Authors: Jiang Wei , Xin Xiu Lan , Yu Yang , Zhu Hai Chao
Published: November 2011

Using different long-chain alcohols (octanol, dodecanol, tetradecyl alcohol), maleic anhydride, allyl chloride, sodium bisulfite as the main raw materials, a series of polymerizable emulsifier--allyl-type sodium sulfosuccinic diesters have been synthesized in this paper. Through single-esterification and double-esterification, three diesters have been synthesized. The sulfonation conditions are as follows: using sodium maleic acid monoester as the phase transfer catalyst, sodium bisulfite and double-ester were allowed to react in the ratio of 1.0: 1.1 at 110°C for 4h in the solvent of a mixture of ethanol and water. The yield of sulfonation on sodium octyl sulfosuccinic diester and sodium dodecyl sulfosuccinic diester as well as sodium tetradecyl sulfosuccinic diester were 94.8%(Ⅰ), 96.78%(Ⅱ) and 93.6%(Ⅲ), respectively. All products were charac 4 terized by IR spectra and 1H NMR, and their surface properties were tested. The results showed that the surface properties of dodecyl sodium maleic acid monoester and tetradecyl sodium maleic acid monoester as well as sodium tetradecyl sulfosuccinic diester were better than lauryl sodium sulfate, and they were all suitable for being used as emulsifier.
Studies on the Synthesis and its Properties of Reversible Red-Thermochromic Materials
Authors: Hao Xiao Xiu , Wei Na , Yin Xing , Sun Cheng
Published: November 2011

The synthesis of reversible red-thermochromic materials when temperature range at re-spectively 36.0～39.5°C, 44.5～46.5°C, 51.0～53.5°C with the tetradecanol, hexadecanol and octa-decanol as corresponding solvents, letlacton compound of 3-diethylamino-7,8-phenyl-fluoran as procrypsis dye as color agent were studied in this paper. The chromic properties of reversible red-thermochromic materials by infrared spectrum technology were analyzed.Experiment shows, In the reversible thermochromic materials, the solvent to determine its color temperature, color agent is mainly to determine its color depth, procrypsis dye itself to determine its color and stability proper-ties. The optimal matchs of procrypsis dye, color agent and solvent are 1:4:30(tetradecanol), 1:3:40(hexadecanol), 1:2:20(octadecanol) respectively. This paper has theoretical and practical di-rection function in counterfeiting printing and packaging field of reversible thermochromic material.
Mechanical Properties of Nano-Indentation of Diamond Coating in Infrared Window
Authors: Wang Hong Xiang , Zuo Dun Wen , Xu Chun
Published: November 2011

Diamond coatings were prepared on mono-crystalline silicon by hot filament chemical vapor deposition (HFCVD). Hardness, elastic modulus and other mechanical properties of the diamond were analyzed by nanoindenter. The results showed that the process parameters such as chamber pressure, substrate temperature, methane volume ratio have a greater impact on the mechanical properties of the diamond coating. The micro-hardness and elastic modulus of the coating would both decrease with too high or too low substrate temperature, chamber pressure or volume ratio of methane. The results showed that when the substrate temperature is 750°C, champer pressure is 2.5kPa and methane volume ratio is 2%, the diamond coatings have high micro-hardness and elastic modulus.
Performance Research of VW-1-011 Type Ball and Cage Universal Joint
Authors: Yu Qing
Published: November 2011

VW-1-011 type ball and cage universal joint is applied widely in automobile, which performance directly affects the safety of car driving. It is important significance to research the performance of cage-type universal joint as its force complex. The diversity important position of ball and cage is analyzed by FEA ALGOR software in paper, and the distribution of stress or strain is obtained, which the results provide a theoretical basis and reference for the designer of Cage-type universal joint.
Influences of Initial Residual Stresses on Milling Distortion for Thick Aero-Aluminum-Alloy Plate
Authors: Guo Hun , Zuo Dun Wen , Tang Guo Xing , Gan W.M.
Published: November 2011

Formulae of stress re-distribution and distortion by stress releasing during milling process are deduced to Initial Residual Stresses. Theory prediction of milling deformation due to residual stress is finished, and some calculating equation is given for the deformation solution. By means of these researches, the mechanism of the milling deformation due to residual stress is analyzed, the machining distortion caused by residual stress are analyzed and summarized using the analytical method.
Equivalent Conversion Calculation of Straight Bevel Gear’s Mesh Stiffness
Authors: Wang Long Bao , Wang Gui Cheng , Wang Zhi
Published: November 2011

Based on analyzing the defects of the usual equivalent conversion methods,the paper presents a new equivalent conversion method for mesh stiffness calculation of straight bevel gears of the small teeth number and diameter. By means of comparison among the different calculation methods,the conclusions can be obtained as follow:The straight bevel gear’s mesh stiffness value calculated by the new equivalent conversion method and Yishikawa formulae improved is more enhanced obviously than one calculated by the usual equivalent conversion methods and Yishikawa formulae ,and its change trend is closer to the numerical calculation value than the change trend of the straight bevel gear’s mesh stiffness value calculated by the usual equivalent conversion methods and Yishikawa formulae.
FEM Simulation Analysis of Cross Wedge Rolling Process
Authors: Li Bin
Published: November 2011

This paper investigates the interfacial slip between the forming tool and workpiece in a relatively new metal forming process, cross-wedge rolling. Based on the finite elements method, three-dimensional mechanical model of cross wedge rolling process has been developed. Examples of numerical simulation for strain, stress distributions and rolling load components have been included. The main advantages of the finite element method are: the capability of obtaining detailed solutions of the mechanics in a deforming body, namely, stresses, shapes, strains or contact pressure distributions; and the computer codes, can be used for a large variety of problems by simply changing the input data.
Modeling Analysis of Micro-Burr Formation
Authors: Xiong Yong Hua , Wang Gui Cheng , Chen Jian , Li Hai Lin
Published: November 2011

One of the main problems in the process of micro-machining for small and precision parts is that micro-burr will be generated. This paper carried out the two-dimensional numerical simulations with ABAQUS, which simulated the effects on burr formation coming from the micro-burr formation mechanism, tool geometry and cutting parameters in micro-machining process. The general rules of various factors impacting on burr formation were obtained in micro-machining process.
Stress-Frequency Character of AT-Cut Thin Circular Multi-Electrode Quartz Resonators
Authors: Tian Wen Jie , Zhou Hong Yun , Sun You Bin , Dong Gui Feng
Published: November 2011

Stress distribution of the thin circular quartz crystal has been analyzed by ANSYS finite element simulation when subjected to radial force. A quartz crystal resonator with same base and different electrode is designed. When putting on the radial force, we research the force sensitive nature of this resonator and its relationship with the force azimuth. The results show that, It is closely to the resonator structure and the force position, that the force sensitive character of quartz resonator with same crystal and different position. Selecting the appropriate force position, we can receive greater diversity of force sensitivity. The output using difference frequency between the different resonators can suppress interference factors. Making the difference frequency signal as a superposition of complex processing can enhance this resonator overall force sensitive. With the difference frequency and signaling complex, the force-frequency conversion coefficient of this resonator is up to 500Hz / N.
Research on Character of Integrated Quartz Crystal Resonators
Authors: Tian Wen Jie , Sun You Bin , Zhou Hong Yun , Dong Gui Feng
Published: November 2011

The force sensitive characteristic of integrated quartz crystal resonator assembled on one quartz crystal substrate with a certain radial direction force are studied, and it is also studied that the force sensitive characteristic of output frequency which is the mixing frequency by resonant frequency corresponded to the resonators in the different position of the same quartz crystal wafer outputted in difference frequency way. The research result shows the force sensitive characteristic of AT-cut integrated three-electrode quartz crystal resonator outputted in difference frequency way is 1.3 times of that of the traditional single-electrode resonator. The force sensitive characteristic of the integrated four-electrode resonator is a little bit smaller, but two sets of output can be obtained at the same time. The frequency stability of all integrated quartz resonator can get to the magnitude of 10-10 and relative frequency variation is about ±5ppm in the range of -50°C to 60°C.
Parameter Optimization of Kanban Production System for an Engine Assembly Workshop Based on Witness
Authors: Xiao Yan , Li Yun Yun , Zhou Kang Qu
Published: November 2011

To kanban production system of a engine assembly shop as the empirical study, the simulation model of the Kanban production system about designing, running and optimizing are elaborated, which is on the basis of understanding basic theory of Kanban production system. More importantly, using optimization, researched further the effects of different value of safety factor and coefficient of variation of Kanban production system on the impact of the results, and determined the optimal combined scheme.
Cracking Risk Appraisal of High Performance Recycled Pavement Concrete and its Application
Authors: Zhang Li Juan , Xu Yi Dong , Pan Lei , Wang Bing Bing , Lou Chi
Published: November 2011

Based on the technology of high performance concrete, high performance recycled pavement concrete (HPRPC) were developed by double -mixture of fly ash and superplasticizer. The dry shrinkage and plastic shrinkage cracking evaluation test were conducted. As is shown by the results, the compressive strength of HPRPC at 28d are exceed in 60MPa and dry shrinkage at 120d are less than 500με. By contrast, the cracking -resistant performance of HPRPC-7 is superior to that of HPRPC-2.
High-Quality Polysilicon Thin Film Recrystallization by Laser Annealing
Authors: Wu King Kung , Chang Wen Chung
Published: November 2011

Amorphous silicon (a:Si) recrystalized to poly-silicon (poly:Si) in different gas environments by excimer laser annealing (ELA) is studied. Variations of threshold laser power for the generation of surface ablation in pure N2 gas and the mixture of N2:98% and O2:2% environments are also investigated, respectively. From experiments, it is found the combination of N2:98% and O2:2% gas can enhance the threshold laser power from 320mJ/cm2 to 390mJ/cm2 for the suppressing of surface ablation phenomenon. In the condition of average grain over 0.25um, the process window (i.e. laser power for processing ability) is 30mJ/cm2 for pure N2 only, but is 50mJ/cm2 for the combination of N2:98% and O2:2%.
Sol-Gel Films Prepared with Pure Alumina Sol by Re-Dissolution on Aluminum Alloy
Authors: Zhou Qi , Zhao Hong Liang , Song En Jun , Chen Xiu Lian
Published: November 2011

The development of non-hexavalent chromium conversion coating on aluminum alloy is imminent, hexavalent chromium Cr6+ compounds have serious threat to the environment. The appearances, viscosity, particle size of aluminum nitrate sol prepared by re-dissolving were tested by orthogonal experiment. The results show that a better condition for preparing sol by re-dissolving the aluminum nitrate sol is: [Al3+] of 0.3mol/L, sol at 55~85°C or 0.6mol/L, at 55°C. The pH value ranges 7~9 before re-dissolving. The salt spraying resistance for the sol-gel film prepared by sol of which viscosity ranges 4.8 ~ 6 mPa/s is better than five grade. The dry adhesion for paint film is qualified when viscosity ≤ 5.6 mPa/s and the average size of particles <920 nm for sol. In terms of sol appearance, dry adhesion and salt spray properties of the sol-gel film made by blue and white or gray sol are good. [Al3+] concentration and sol temperature for preparing sol-gel film with better corrosion resistance are equally important, secondly is pH before re-dissolved. Dry adhesion between paint film and aluminum alloy is qualified when [Al3+] ranges 0.3 ~0.6mol/L. Corrosion resistance for alumina sol-gel film of [Al3+] concentration of 0.3 and 0.77mol/L is worse than that of 0.6mol/L. The times of spray coating has no influence on corrosion resistance, while the increased frequency of coating times, and film adhesion decrease. In short, if you want that painting film adhesion and corrosion resistance are both good, Al3+ concentration should be 0.6mol/L for pure aluminum sol. The preferable prepared conditions are that aging at 55 °C, pH of sol re-dissolved with nitric acid is 4 after adding ammonia until pH reaches 8, coated one times, two or more times, the adhesion of the coating will reduce.
Elastic-Plastic Fractal Damage Constitutive Law for Concrete
Authors: Xie Ming , Zheng Shan Suo
Published: November 2011

In consideration of stochastik and discreteness of fracture surface, a class of mesoscopic damage mechanics model of concrete based on spring model, are put forward to understand the real damage evolution characteristics of concrete at the level of constitutional law. A kind of spring-slipper model is introduced to reflect the elastic-plastic damage behavior. Uniaxial test was operated, combined with the Computerized Tomography test of concrete, to study the evolution of crack surface from mesoscopic level to macroscopic level. And the rationality of fractal damage constitutive law was verified with their theoretical calculation result and test results. Compared with the existing damage constitutive law and experimental results preliminarily, the feasibility of fractal damage constitutive law is verified.
The Extraction of Main Chemical Compositions in Rumex Root
Authors: Jiang Yong , Jiang Zhi Bin , Shao Guo Jie , Guo Dong Cheng , Tian Yu , Song Jin Jin , Lin Yan Yun
Published: November 2011

Purpose: The purpose of this study was to study the compositions of the polygonaceae medicinal plants called rumex root. Methods: Solvent method and chromatography was used to purificate the chemical compositions of Rumex, and the molecular structure of the compound was identified by physical and chemical properties and spectral data. Results: Two compounds were obtained from the ethanol extract of rumex root, which were identified as Chrysophanol and Physcione. Conclusions: Experimental basis was provided for the further study of the active ingredients of rumex root and the development and utilization of medical resources.
Color Design Plan in the Significance of Product Design
Authors: Chen Xu
Published: November 2011

Color design plan for modern design provides a new way of thinking. Color design plan in product design, to design results promote a convenient and accurate and strict scientific significance; For enterprise development and occupy the market marketing is of strategic significance; To reflect the product has a certain taste of culture connotation of meaning.
The Microstructure and Adsorption Property of Improved Coal Gangue
Authors: Dong E. , Guan Long
Published: November 2011

Since coal gangue can destroy the environment, we aim at improving coal gangue to absorbing material by changing it in different temperature and chemical liquor. Base on the microstructure and the adsorption experiment, we detect microstructure and absorption property of improved coal gangue. The microstructure experiment shows that the average pore size and specific surface area of improved coal gangue appear distinguish obviously as the increasing of chemical liquor pH value and temperature. Absorption experiment shows that the absorption capacity of improved coal gangue decrease as the chemical liquor pH value increase, increase as the temperature increase. The adsorption capacity of improved coal gangue increases with an increase of average pore size and specific surface area.
Research the Layered Structure Affect on Seismic Dynamic Response of Rock Slope
Authors: A Fa You , Kong Ji Ming , Ni Zhen Qiang
Published: November 2011

The deformation and failure induced by Wenchuan earthquake between bedding and anti-dip slope existence very big difference. The number and size of the bedding slope deformation and failure are much more than the anti-dip slope according to the investigation and analysis. In order to analyze the layered structure affect on seismic dynamic response of rock Slope. As bedding and anti-dip slope is the study object and the seismic dynamic responses of different layered structure slope have been studied by using ANSYS finite element method in this study. Analysis shows that slope as a structure, the internal structure different lead to the slope seismic dynamic response is also different. The bedding and anti-dip slope seismic dynamic response is discontinuous or mutations in the slope as layered structure interface the boundary. And the seismic dynamic stress, displacement and acceleration of the bedding slope are always greater than the anti-dip slope. The seismic response characteristics further increased the deformation and failure probability of bedding slope. The results consistent with the investigation conclusion that the stability of anti-dip better than the anti-dip slope
Effects of Different Exogenous Estradiol Contents on Steroid Hormones, GSI, Survival Rate and Sex Reversal in the Asian Swamp Eel
Authors: Yuan Han Wen , Xu Qiao Qing , Gong Shi Yuan , Yuan Yong Chao , Chu Zhang Jie , Yang Dai Qin
Published: November 2011

This study investigated the effects of exogenous estradiol on sex reversal in the Asian swamp eel (Monopterus albus) by evaluating the estradiol (E2) and testosterone (T) concentrations, gonadosomatic index (GSI), hepaticosomatic index (HSI) and the sex ratio. Fish (9.60 ± 0.92 g average initial weight; n = 3 per group) were fed with six different diets containing 0 (control), 20, 40, 60, 80 or 100 mg kg-1 dietary estradiol contents to apparent satiation for 15 months. Serum E2 and T concentrations were determined by radioimmunoassay. Levels of E2, GSI and HSI significantly increased while T concentrations and survival rates decreased as the exogenous estradiol levels were raised. Sex ratios did not differ significantly among all exogenous estradiol treatments, and there were no significant differences between the control group and the 20 mg kg-1 treatment group. Therefore, exogenous estradiol can maintain the female activity and delay sex reversal in M. albus. This study provides important information for successful reproductive management and may be exploited for the aquaculture of this species.
Analysis Methods on Life Cycle Reliable Performance Index of Construction Engineering Structure
Authors: Dong Jin , Wei Fa Jie
Published: November 2011

The life cycle performance indicator of construction engineering structure is the basic indicator of the core research indicator system of construction engineering life cycle. This paper has the reliability indicator of construction structure as a foundation, analyzes the general calculating methods of construction structure and reliable performance. On the other hand, it establishes prediction model of construction structure durability based on Markova chain, and introduces a practical case to analysis and test.
Boundary Effect to the Safety Factor of Slope in Geo-Material
Authors: Yu Wei Wei , Guan Xiao Qin , Li Yi Hui , Lin Hang
Published: November 2011

Boundary conditions have great impact on the stability of three dimensional geo-material, like slope, which is one of the oldest applications in geotechnical engineering. In order to analyze the impact of boundary condition to factor of safety of slope, the 3D stability analysis was then extended to the “rough-smooth” and “smooth-smooth” boundary. By studying slopes with the same geometric condition and shear strength parameters, the results show that the safety factors obtained from “rough-smooth” boundary are smaller than those got from “rough-smooth” boundary and bigger than those got from “smooth-smooth” boundary. The study also indicates that when the width to height ratio (W/H) of homogeneous symmetric slope satisfies certain condition, the “rough-rough” boundary equals to the “rough-smooth” boundary. The factor of safety and shape of slip surface got from these two kinds of boundary condition are of the same. Study results can give guidance for the real practice.
Comparisons between Topologies of Flux-Switching Electrical Machine
Authors: Zhu T. T. , Deng Zhi Quan , Wang Yu
Published: November 2011

A flux-switching electrical machine (FSEM) has similar structure to a flux-switching permanent magnet (FSPM) machine. It takes on excellent sinusoidal flux linkage and back EMF when the field and armature windings are well placed so that it can be a good candidate as an AC generator. This paper brings up to five topologies of a 12/10 FSEM, does researches on their basic characteristics and makes comparisons between them. The results are validated by simulations.
Esterification Research on a Bio-Oil Model Compounds System with an Optimal Solid Acid Catalyst
Authors: Gu Yue Ling , Xu Guo Hui , Guo Zuo Gang , Wang Shu Rong
Published: November 2011

Solid acid catalyst has high catalytic esterification activity but with a free acid excess problem. In this paper, washing pretreatments were adopted in the catalyst preparation processes and their influences on catalytic activity and residual free acid amount were investigated. Residual free acid amount can be reduced by 33% with both washing before calcinations and washing after calcinations pretreatments. But their influences on catalyst activities were different. Washing before calcinations pretreatment reduced the catalytic activity from 80.29% to 57.72% while the other washing pretreatment had little influence on the catalyst activity. In order to describe the influence mechanism of washing pretreatments, catalysts were characterized by FT-IR and XRD. Finally, typical compounds in bio-oil were selected to form a bio-oil model compounds system. The catalyst pretreated by washing after calcinations was used on the esterification research of this bio-oil model system. The volume ratio of propanol to bio-oil model compound was 3:1. The reaction temperature was 90 °C and the amount of catalyst was 2wt% of total liquid mass. Combined with the GC-MS qualitative and quantitative results, carboxylic acids, such as formic acid, acetic acid, propionic acid were converted to esters effectively.
The Design and Analyses of Magnetorheological Fluid Throttle Valve
Authors: Wu Rong , Lin Wen Xiang , Tang Wen
Published: November 2011

Magnetorheological (MR) Fluid is an intellectual material with comprehensive prospect. In recent years, it is widely attended in the scientific-research field. Flow rate computational model of the MR throttle valve is derived by using Binham fluid model. The mathematical model of electromagnetic induction intensity for the MR throttle valve is established. The designed magnetorheological throttle valve is simple, compact and has some creativity. Proposed use of magnetorheological hydraulic components presents a problem.
Design of Embedded CNC Device Based on ARM and FPGA
Authors: Zhou Mo
Published: November 2011

A kind of embedded CNC device based on ARM and FPGA is proposed in this article. The core of the article is the interface design between ARM and FPGA and the design of step-motor controller based on FPGA. This CNC device combined ARM’s high running speed and precision with the internal logic reconfigurable of FPGA, reducing hardware costs of CNC device, improving the resource utilization and enhancing the flexibility of the CNC device.