bluuebunny/crossref_metadata_2025 huggingface dataset:
Les universités françaises depuis le passage à l'autonomie : vers de nouveaux outils d'analyse financière ?
Authors: Serve Stéphanie , Le Glass Louis François
Published: October 2017

Le passage aux responsabilités et compétences élargies (RCE) a induit de profondes transformations dans la gestion financière des universités françaises, et certaines d’entre elles ont expérimenté des tensions financières à la suite de cette réforme. Dans un contexte de ressources publiques contraint, il importe d’identifier les zones de risque susceptibles de menacer l’équilibre budgétaire d’un certain nombre d’établissements, c’est-à-dire les zones d’incertitude pesant sur l’ajustement entre dépenses et recettes. On est également conduit à s’interroger sur l’existant en matière d’outils de gestion financière destinés à gérer ces risques. Cet article répond à plusieurs objectifs. Il développe une logique de gestion financière propre à l’objet d’étude « université », préalable nécessaire à l’étude de ses outils de gestion, en s’appuyant sur une double comparaison avec l’entreprise, ainsi qu’avec la collectivité locale. Cette comparaison se poursuit avec un état de l’art sur les outils de gestion financière que les universités sont amenées à déployer du fait des récentes évolutions réglementaires. Cet état de l’art nous conduit à la présentation de la notion d’équilibre budgétaire et à analyser les causes de difficultés financières rencontrées par les universités depuis le passage aux RCE. Enfin, l’article s’appuie sur le concept de soutenabilité budgétaire pour identifier une démarche d’analyse financière pluriannuelle à caractère prospectif. Il conclut sur l’importance de resituer les outils de gestion financière dans le contexte organisationnel de l’université et dans son projet stratégique afin qu’ils prennent toute leur signification et leur utilité. Classification JEL : I23, I28, M41.
Preparation, structure, surface and impedance analysis of Na2Zn0.5Mn0.5P2O7 ceramics
Authors: Venckutė Vilma , Dindune Antonija , Valdniece Dagnija , Krumina Aija , Lelis Martynas , Jasulaitienė Vitalija , Maneikis Andrius , Daugėla Saulius , Šalkus Tomas , Kežionis Algimantas , Orliukas Antanas Feliksas
Published: October 2017

The Na2Zn0.5Mn0.5P2O7 powder was prepared by the solid state reaction method. The powder structure was studied by X-ray diffraction (XRD) in the temperature range from room temperature (RT) to 520 K. The results of XRD measurements show that the obtained Na2Zn0.5Mn0.5P2O7 is a mixture of two phases: Na2MnP2O7, which crystallizes in the triclinic space group P1, and Na2ZnP2O7, which crystallizes in the tetragonal space group P42/mmm. The chemical compositions of the powder and ceramic samples were investigated by an energy dispersive X-ray spectrometer (EDX) and X-ray fluorescence spectroscopy (XFS). The surface of ceramics was examined by X-ray photoelectron spectroscopy (XPS). The electrical conductivity and dielectric permittivity of the ceramics were investigated from RT to 700 K in the frequency range 10–109 Hz. The relaxational dispersion of electrical conductivity in the investigated frequency and temperature range was found.
Telecollaboration: foreign language teachers (re)defining their role
Authors: Ensor Simon , Kleban Marcin , Rodrigues Christine
Published: October 2017

This study uses mixed methodology adapted from Nexus Analysis (Scollon & Wong Scollon, 2004) to analyse the development of in-service and pre-service foreign language teacher identity and their perception of their roles with a potential normalisation of personal digital devices (Bax, 2003) and telecollaboration (O'Dowd, 2009) in the classroom. Diverse institutional, personal, professional and informal discourses were traced to determine a nexus of practice with its constitutive discourses in place, interaction orders and historical bodies. Transgressive, conservative or transformative uses of technology or practices were noted. In an attempt to challenge current visions of possible selves (Kubanyiova, 2009), the teachers were asked to imagine alternative scenarios of technology integration and telecollaboration. Findings suggest that teacher identity results from a complex interplay of institutional, professional, and informal discourses which may be both obstacles and bridges to pedagogical transformation. Confronted by a globally connected classroom, these teachers experience difficulties to redefine their roles and to envisage a foreign language curriculum which integrates new unfamiliar literacies and skills. Telecollaboration, we suggest, should be considered in the context of a digitally mediated networked cultural revolution and may be used as a means to leverage a profound transformation of education.
Learning Language Through Facebook
Authors: Leier Vera Monika
Published: October 2017

This article seeks to account for the experiences of tertiary students of German when a Facebook group and associated tasks is introduced as an assessed element of their language course. Ethnographic methods were applied, such as pre-, post questionnaires, interviews and fieldnotes. The data was collected by the instructor/researcher and subjected to thematic analysis. The students (n = 23) enjoyed Facebook but mostly used the site passively and only actively posted when required. This led to a flurry of posts at deadlines and less engagement between deadlines. Students wanted more feedback than the instructor was giving them, in an effort to make the interaction feel more authentic and spontaneous, as it is in non-educational, social Facebook.
A Qualitative Study on CALL Knowledge and Materials Design
Authors: Sert Olcay , Li Li
Published: October 2017

The present study investigates how academic coursework and formal learning of instructional technology and materials design help pre-service English language teachers' development of critical knowledge of CALL materials. The participants are 111 pre-service English language teachers enrolled in a TEFL programme at a Turkish University. Throughout a 14-week semester, these participants learn to design a variety of CALL materials including online teaching tools and a set of Web 2.0 tools. The article explores the skills and knowledge of pre-service teachers on the design and development of audio-visual web-based activities, through qualitative content analysis of their written reflections. The analyses of reflections on practice have revealed that these teachers demonstrate strong and critical understanding of CALL in enriching authenticity, enhancing motivation, facilitating language learning, and providing multimodal resources. They also display great awareness of instructional knowledge, in particular, in the design and interface of technology to facilitate learning.
Twitter Profiles of Organisations Fighting Against Cyberbullying and Bullying
Authors: Alim Sophia
Published: October 2017

Cyberbullying has become more popular on social networks especially on Twitter due to the popularity of information sharing. However, there is limited research into the tweet content and influence of Twitter profiles of organisations fighting against cyberbullying and bullying. For this article, Twitter profiles of eleven organisations were selected. Tweet contents and profiles features – the number of followers, mentions, retweets, the measure of Klout, interactor ratio and the number of tweet URL clicks – associated with influence and tweet content were analysed. Content analysis of the 321 tweets extracted from the eleven organisations highlighted that advice and opinions were the most discussed categories of tweets. The article showed that influence is a multifaceted concept. It involves not looking just at the popularity of the user but how content attracts other users, how other users react to tweet content and the sentiment the other users feel. Sentiment analysis highlighted the prevalence of sentiments such as fear and trust representing the fight against cyberbullying and bullying.
A Proposed SOAP Model in WS-Security to Avoid Rewriting Attacks and Ensuring Secure Conversation
Authors: Mohana Rajni
Published: October 2017

Service oriented architecture is a current and popular software engineering paradigm providing agile web services to consumers in a dynamically changing enterprise environment. The SOAP messages are used to establish communication between the web services which are vulnerable to rewriting attacks and insecure conversation. XML Signature as specified in WS-Security provides security to the contents of the SOAP messages but is insufficient. This paper proposes a SOAP model where rewriting attacks can be avoided and a secure conversation can be established as well. This paper recommends three steps, firstly using shared key for encrypting timestamp in the message body for generating corresponding signature; Secondly, using value referencing both for signature validation and message processing; and finally encrypting the whole SOAP body instead of sending an open SOAP Message in the network to prevent unauthorized access. The paper concludes that the proposed model successfully detects rewriting attacks and establishes secure conversation in the to-and-fro message transmission.
Breaching Security of Full Round Tiny Encryption Algorithm
Authors: Kaushal Puneet Kumar , Sobti Rajeev
Published: October 2017

Tiny encryption algorithm is a 64-bit block cipher designed by Wheeler and Needham in 1994 and attracted much of its attention due to its capability of reducing the hardware cost. In this paper, we introduced coincidence count attack at bit level, a kind of known-plaintext attack and evaluated the resistance of TEA to withstand with it. We also examined confrontation of full round TEA against bit sum attack. Furthermore, we introduced a modest algorithm based on coincidence count and bit sum concept that makes it easy to find relevant plaintext corresponding to an arbitrary cipher text with a probability of 0.93. We also presented how cipher text originated from tiny encryption algorithm can be distinguished from a random permutation of binary sequence.
A Thematic Review of Blended Learning in Higher Education
Authors: Pima John Marco , Odetayo Michael , Iqbal Rahat , Sedoyeka Eliamani
Published: October 2017

This article reviews the international literature on blended learning in view of establishing its thematic trends in higher education. The systematic review through PRISMA, sought to answer three research questions: First, how have publications evolved from 2000 to 2016 in blended learning in higher education? Secondly, what themes are frequently published in blended learning since 2000 to 2016? Thirdly, what are the emerging sub-themes in the blended learning publications in higher education? A thematic result is presented indicating major trends (in order of frequency: highest to lowest) in the Instructional design, Disposition, Exploration, Learner Outcomes, Comparison, Technology, Interactions, Professional Development, Demographic, and Others. The authors are of the view that this article contributes to the understanding and knowledge of the current research trends in blended learning and ascertains that much has to be done in terms of Blended Learning frameworks.
Comparative Study of Elementary and Secondary Teacher Perceptions of Mobile Technology in Classrooms
Authors: De Jong David , Grundmeyer Trent , Anderson Chad
Published: October 2017

More and more schools are implementing a 1:1 mobile device initiative for their students because the future of learning will have technology embedded within the curriculum. Teachers are often given the direction to utilize mobile devices in the classroom, but quite often educators do not understand the significance of this technology or agree with its purpose. The purpose of this study was to explore elementary and secondary teacher perceptions of mobile technology in the classroom. According to the survey results, elementary and secondary teachers feel positive about the uses and the importance of mobile technology in the classroom. These positive perceptions by teachers regardless of gender, age, and training indicate that schools should continue to allocate resources to purchase mobile devices for all students.
Accessing Map Information Using NFC-Based User Interfaces for In-Situ Learning Environments
Authors: Tesoriero Ricardo , Fardoun Habib M. , Awada Hachem , Raisinghani Mahesh S.
Published: October 2017

Maps have been used by teachers for centuries to manipulate information related to geographical locations. This paper presents a novel way to interact with maps through the combination of mobile devices and the Near Field Communication (NFC) technology. This proposal provides teachers and students with the ability to retrieve and store information related to geographical locations defined in a traditional paper map. Consequently, the information that is exchanged among teachers and learners is contextually enriched with a reference to a geographical location in a physical map. This interaction mechanism is an interesting way to encourage in-situ learning scenarios, such as teaching Geography lessons in museums, art galleries, historic buildings or outdoor scenarios, etc. Thus, this article describes an application that employs a NFC-based interaction mechanism to browse geographical information in physical maps. It also presents the hardware and software infrastructure required support this application. Finally, it analyzes the result of a preliminary usability evaluation of the application.
An Artificial Intelligent Centered Object Inspection System Using Crucial Images
Authors: Sahoo Santosh Kumar , Choudhury B. B.
Published: October 2017

This article proposes a unique optimization algorithm like Adaptive Cuckoo Search (AdCS) algorithm followed by an Intrinsic Discriminant Analysis (IDA) to design an intelligent object classifier for inspection of defective object like bottle in a manufacturing unit. By using this methodology the response time is very faster than the other techniques. The projected scheme is authenticated using different bench mark test functions along with an effective inspection procedure for identification of bottle by using AdCS, Principal-Component-Analysis (PCA) and IDA. Due to this the projected procedures terms as PCA+IDA for dimension reduction in addition to this AdCS-IDA for classification or identification of defective bottles. The analyzed response obtained from by an application of AdCS algorithm followed by IDA and compared to other algorithm like Least-Square-Support-Vector-Machine (LSSVM), Linear Kernel Radial-Basic-Function (RBF) to the proposed model, the earlier applied scheme reveals the remarkable performance.
Fake Empathy and Human-Robot Interaction (HRI)
Authors: Vallverdú Jordi , Nishida Toyoaki , Ohmoto Yoshisama , Moran Stuart , Lázare Sarah
Published: October 2017

Empathy is a basic emotion trigger for human beings, especially while regulating social relationships and behaviour. The main challenge of this paper is study whether people's empathic reactions towards robots change depending on previous information given to human about the robot before the interaction. The use of false data about robot skills creates different levels of what we call ‘fake empathy'. This study performs an experiment in WOZ environment in which different subjects (n=17) interacting with the same robot while they believe that the robot is a different robot, up to three versions. Each robot scenario provides a different ‘humanoid' description, and out hypothesis is that the more human-like looks the robot, the more empathically can be the human responses. Results were obtained from questionnaires and multi- angle video recordings. Positive results reinforce the strength of our hypothesis, although we recommend a new and bigger and then more robust experiment.
Universality of Egoless Behavior of Software Engineering Students
Authors: Waychal Pradeep , Capretz Luiz Fernando
Published: October 2017

Software organizations have relied on process and technology initiatives to compete in a highly globalized world. Unfortunately, that has led to little or no success. The authors propose that the organizations start working on people initiatives, such as inspiring egoless behavior among software developers. This paper proposes a multi-stage approach to encourage egoless behavior and discusses the universality of the egoless behavior by studying cohorts from three different countries, i.e., Japan, India, and Canada. The three stages in the approach are self-assessment, peer validation, and action plan development. The instrument to assess egoless behavior is based on Lamont Adams' “Ten commandments of egoless programming” – seven of the commandments are general, whereas three are related to coding behavior. The authors have found that students display relatively poorer egoless behavior in coding related than general commandments. The authors found traces of universality in the egoless behavior among the three cohorts.
Preparation of UHPC with Fly Ash Replaced by Rich-Silicon Iron Ore Tailing Powder
Authors: Liu Ke Xin , Zhu Zhi Gang , Li Shun Kai , Zhang Si
Published: October 2017

In order to raise up the the rate of multipurpose utilization of rich-silicon iron ore tailing (IOTP for short) and the preparation of ultra-high performance concrete(UHPC for short), the influence rules and mechanism of rich-silicon iron ore tailing powder replacing fly ash in UHPC were studied, the influences of different specific surface area and dosage of IOTP replacing fly ash on its strength and liquidity were tested. Moreover, the pore structure and hydration products morphology of UHPC were tested by MIP and SEM methods, respectively. The results show that when fly ash replaced by IOTP, the liquidity of UHPC will be increased. When alternative content of IOTP is less than 10%, proper specific surface area of IOTP can improve the strength and pore structure, it can get the best result when the alternative content is 5% and the specific surface area is 588m2/kg. However, when alternative content of IOTP is 15% or more, all of these properties of UHPC become worse. It proves that IOTP can be used in the preparation of UHPC and improve the properties of UHPC.
Parameters Determination of Mooney-Rivlin Model for Rubber Material of Mechanical Elastic Wheel
Authors: Du Xian Bin , Zhao You Qun , Lin Fen , Xiao Zhen
Published: October 2017

In order to improve the driving safety of vehicles, a non-pneumatic safety tire named mechanical elastic wheel was developed, and the structural components of mechanical elastic wheel and the method of determining the rubber material parameters of Mooney-Rivlin model were introduced. Uniaxial tensile tests of the rubber in different parts of mechanical elastic wheel were carried out with a stretch test machine and the material parameters and of the Mooney-Rivlin model were determined by fitting the experimental data. Finite element method (FEM) was used to validate the stability of the fitted data. The results show that the obtained material parameters have high accuracy and can be a reference for the subsequent finite element simulation of mechanical elastic wheel.
Vibration Characteristic of Multi-Stage Linear Motor Pumping Unit
Authors: Liu Yan , Wang Sen , Zhao Yang Yang
Published: October 2017

The vibration reason of the linear electric motor is analyzed for multi-stage linear pumping unit. A different order number expression of natural frequencies under wave action is given. Respectively, the finite element simulation software is used for linear motor and linear pumping machine of vibration characteristic analysis. Vibration quality participate coefficients of linear permanent magnet motor are provided under different frequency. Through the analysis, it shows that optimized motor structure can restrain vibration, so as to ensure the stability of multi-sections of straight beam pumping unit.
Numerical Simulation Research of Butterfly Valve in Acoustics Field Variation Characteristics
Authors: Wei Hai Jiao , Wu Guo Fang , Zhang Fu Hong , Xue Jiao , Zhou Kun Sheng , Yang Xue Feng
Published: October 2017

A numerical simulation research was carried out on vortex and sound pressure level of the butterfly valve in the flow process based on FLUENT, which analyzed the variation of the vorticity and sound pressure level at different opening angles. There was an inverse pressure gradient in the orifice formed by the butterfly plate and pipe, which caused partial particle reflux on the back of butterfly plate in flowing, thus formed the vortex. The vortex formed on the back of the butterfly plate was decreased gradually, with the increasing opening angle of the valve in opening process. The noise was generated by the vortex separated and rupture in flowing. And the sound pressure level on the back of butterfly plate was decreased with the increasing opening angle. At the same time, the vorticity and the maximum sound pressure level position moved from the center to the rotation center of butterfly plate in opening process. The expanding orifice formed by butterfly plate upstream and the pipe and the tapered orifice formed by butterfly plate downstream and the pipe had the different throttling action to the fluid, which made the sound pressure level of upstream was higher than that of downstream in symmetrical position. The vortex generated by the separation of boundary layer would cause vortex excited vibration between plate and fluid, and then resonance occurred. The studies were carried out in the vorticity and the sound pressure level on the downstream of butterfly plate, and the changing law of those was found. It would provide a basis theory for reducing noise and avoiding vortex vibration of butterfly valve.
Multi-Physics Coupling Analysis of Efficient Pumping Unit Linear Motor
Authors: Wang Sen , Zhao Yang Yang , Yan Hong Kui , Liu Dong Ling , Zhao Dong Sheng , Li Si Yang , Ren Yan Long , Guo Jia Cheng
Published: October 2017

Taking efficient pumping-unit linear motor as the research object in this paper, SOLIDWORK has been used to establish 3D model and analyze multi-physics of the efficient pumping-unit linear motor, including vibration mode, stress analysis and the analysis of temperature field. Through the simulation analysis, getting efficient pumping unit linear motor of the top five order vibration frequency, pressure distribution and temperature distribution, theoretical references are provided for the analysis of the efficient pumping-unit linear motor. The innovation of the article is in coupling analysis of multi-physics.
Dynamic Reliability-Based Robust Optimization Design for the Hoist Drum Web Plate
Authors: Wang Xin Gang , Zhang Lu Yao
Published: October 2017

Considering the traditional safety factor method of reliability design can’t well reflect the uncertainty of loads, and error is obvious by using the tension of the wire rope represents the stress state of the hoist drum web plate. Established stress model of the dangerous section of the hoist drum web plate. Deduced reliability index and reliability by using stress & strength interference theory and perturbation method. Sensitivity analysis and robust optimal design was performed on this basis. The results show that the strain on the hoist drum web plate has a great influence on reliability of itself, and the reliability robust optimization design information can be obtained by using strain on web plate and reliability as optimization objectives. These not only provide the theoretical basis for the safety maintenance and design of the hoist, but also have the practical application value for reliable and efficient delivery of hoist.
Study on Linear Relationship between Refractive Index Difference and Band Gap Width of the 1-D PCs
Authors: Cai Yun Gao , Dong Ying Hong
Published: October 2017

Set the Refractive Indexes of the One-Dimensional Photonic Crystals (1-D Pcs) were n2 and n3, Keeping n2=1.5 Unchanged and Adjusting n3 in the Range of 2.5--3.5, the Dispersion Curves were Obtained through Characteristic Matrix Method (CMM). The Results Show that when n3 Increased from 2.5 to 3.5, the Band Gap Width Also Increased from about 0.086 to 0.140 Correspondingly. Furthermore, the Results Show that it’s a Linear Growth Process between the Refractive Index Difference and the Band Gap Width of the 1-D Pcs, for the First Propose Quantitatively, there is a Relationship Equation Δω=0.0537(Δn)+0.0336(Δn=n3-n2) Approximately.
Constitutive Modeling for Elevated Temperature Flow Behavior of ZHMn34-2-2-1 Manganese Brass
Authors: Wang Meng Han , Wei Kang , Li Xiao Juan
Published: October 2017

The hot compressive deformation behaviors of ZHMn34-2-2-1 manganese brass are investigated on Thermecmastor-Z thermal simulator over wide processing domain of temperatures (923K-1073K) and strain rates (0.01s-1-10s-1). The true stress-strain curves exhibit a single peak stress, after which the stress monotonously decreases until a steady state stress occurs, indicating a typical dynamic recrystallization. A revised constitutive model coupling flow stress with strain, strain rate and deformation temperature is established with the material constants expressed by polynomial fitting of strain. Moreover, better prediction ability of the constitutive model is achieved by implementation of a simple approach for modified the Zener-Hollomon parameter considering the compensation of strain rate and temperature increment. By comparing the predicted and experimented values, the correlation coefficient and mean absolute relative error are 0.997 and 2.363%, respectively. The quantitative statistical results indicate that the proposed constitutive model can precisely characterize the hot deformation behavior of ZHMn34-2-2-1 manganese brass.
Research on Adaptive Kalman Filter for INS
Authors: Wei Kai Xia
Published: October 2017

Due to sensor accuracy and noise interference and other reasons, the measured data may be inaccurate or even wrong. This will reduce the accuracy of the filter and the reliability and response speed of the Kalman filter, and even make the Kalman filter lose the stability. In this paper, a new INS initial alignment error model and observation model are derived for the errors in INS initial alignment. The adaptive Kalman filter is built to improve the stability and the accuracy of filter. The specific method is to make the adaptive Kalman filter manage to correct the filter online by getting the observed data. The simulation results show the proposed algorithm improves the accuracy of initial alignment in SINS, and prove the adaptive Kalman filter is effective. The main innovation in this paper is to manage to build the adaptive Kalman filter to modify the filter online by using the observed data. The adaptive Kalman filter algorithm improves the accuracy of the filter.
CPPM: A Logical Architecture for the Cyber-Physical Production Model
Authors: Moraes Eduardo Cardoso , Lepikson Herman Augusto
Published: October 2017

Cyber-Physical Systems (CPS) are not a fad anymore, they are changing the way industries and companies plan and model their businesses in a distributed, dynamic, service-oriented way using virtualized resources that are scalable and accessed over the Internet. This change raises new challenges and opportunities for companies. In the last decade the industrial automation field has been introducing important technologies that are changing and integrating the Internet and other emerging technologies, concepts, methods and tools, such as cloud computing, agents and Service Oriented Architecture (SOA). These new approaches are resulting in the convergence of the physical world and the virtual world (cyberspace) in the direction of Industry 4.0. Industries are being forced to change and manage their IT and automation services through IT-enabled services to use new paradigms, and huge efforts of R & D are being made in this field. It is clear that in order to change the automation state many possibilities and paradigms are on the table. This work introduces a logical architecture for a cyber-physical production model, intending to help organizations adopting cyber- physical based services.
Optimization of Regenerative Braking Control Strategy for Pure Electric Vehicle
Authors: Guo Zhi Jun , Yue Dong Dong , Wu Jing Bo
Published: October 2017

The regenerative braking strategy for precursor pure electric vehicle was studied in this paper. Firstly, a constraint optimization model was established for the braking force distribution, in which both braking stability and recovery efficiency of braking energy were taken into account. Secondly, Particle Swarm Optimization (PSO) algorithm was applied to optimize the multi key parameters in the model. Finally, the optimized braking torque of the motor was obtained at different speed, different braking strength and different battery charge state. A vehicle model was built to validate the optimized results through simulation. The results showed that, compared with the original control strategy, the optimized control strategy not only could increase the braking stability effectively, but also improve the energy recovery efficiency in a certain extent.
Study on Active Suspension with Variable Structure Control Based on the Fractional Order Exponential Reaching Law
Authors: Chen Yan Dong
Published: October 2017

Based on the dynamic model of 1/4 vehicle suspension, an active control system is designed using the fractional order exponential reaching law of model following variable structure control strategy. An active suspension with linear quadratic optimal control is used as the reference model. The sliding mode switching surface parameters is designed by pole placement method to ensure the stability of the system. At the same time, combined with the index reaching law proposed by Professor Gao Wei Bing and the definition and properties of fractional index, constructs a similar fractional order exponent reaching law to improve the dynamic quality of sliding mode motion. And in MATLAB, system modeling and controller design are implemented. By setting up experiments, the different suspensions are compared. The results show that compared with the passive suspension, the performance of the vehicle can be improved better, and the performance of the tracking reference model has good tracking performance. Moreover, compared with the integral exponential reaching law, the chattering can be more effectively weakened. Finally, before and after the change of vehicle parameters in the simulation, the results show that the system has good robustness.
Design of Measuring System for Conical Shell Gluing Platform and Analysis of Factors Influencing Measurement
Authors: Liu Li Chao , Zhu Xiang Long , Dong Zhi Gang , Kang Ren Ke
Published: October 2017

As a cover to prevent the inside system from being destroyed, conical shell is widely used in national defense and meteorological fields. Radial runouts at specific cross sections of conical shell need to be measured before and after gluing for coaxiality requirement between conical shell and connecting ring. So a measuring system of vertical gluing platform was designed. Noncontact laser displacement sensor was adopted in the measuring system for advantages of quick data acquisition, high measuring accuracy and no surface scratch. Compared with traditional measuring method by a dial indicator, laser displacement sensor is more appropriate to carry out the measurement on the surface of conical shell. An open CNC system was developed for the measurement. It was based on industry personal computer (IPC) which and took motion control board and data acquisition board as its core. Experiments were conducted on the designed measuring system to find out the factors which influence measuring results. Measuring data showed that measuring results appeared to be a parabolic distribution in the working range of the sensor and the symmetry axis of the parabola was at the middle position. The variation of incident angle has no obvious influence on measuring results.
The Current Situation Investigation and Countermeasure on Employees' Pressure in the Information Technology Industry
Authors: Zhang Jian Dong , Yu Qian Cheng
Published: October 2017

With the development of knowledge economy in the twenty-first century, the severe stress of employees in the Information Technology industry which as a typical representative of high and new technology industry has become the consensus of the industry. The negative effects of the too much pressure on the employees and organizations have been prominent. On the basis of predecessors' achievements, this paper reviews the sources of stress and the relationship between stress management and job performance.It points out the consequences of working pressure.We choose Dalian area as the target groups.Through working pressure questionnaire investigation and depth interview method, we can see that the staff in IT industry have obvious working pressure. These pressure not only affects the staff's physical and mental health, but also influence the employee's work efficiency. We put forward suggestions on pressure management of the employees in Dalian area.
Microstructure and Mechanical Properties of Mo2FeB2 Based Cermets with/without Nb Addition
Authors: Ke De Qing , Pan Ying Jun , Xu Yuan Yuan , Yang Lin , Wu Run
Published: October 2017

Four series of Mo2FeB2 based cermets with different Nb content between 0 and 6 wt.% had been successfully fabricated by liquid phase reaction sintering (LPRS). The densification behavior, microstructural characteristics and mechanical properties of Mo2FeB2 based cermets were investigated. The result shows that with the increase of Nb content, the grain size decreased, but more pores formed. Meanwhile, the hardness and transverse rupture strength both be increased first and then decreased. Mo2FeB2 based cermets doped with 4 wt.% Nb content have the highest hardness and TRS of HRA 90.6 and 1970 MPa.
Design and Analysis of Flow Field in Electrochemical Cutting Processing by Arranged Tube Electrode
Authors: Yao Jun , Nie Yu Jun , Chen Zhi Tong
Published: October 2017

The large complex structure integral components composed of difficult-to-machine material (such as titanium alloy, high temperature alloy) are more and more widely applied in aerospace, weapon equipment and other industries. The material utilization rate and the processing efficiency of the milling process are very low, the cost is high. Micro copper tubes (diameter 2mm, inner diameter 1.6mm) are arranged to electrode with shape to be processed, which could cut these components with a high efficiency and low cost. The fabrication of electrode is simple and convenient, so the cost of electrode could be reduced too. The flow field design is an important problem to be solved. The model of flow field is established, and flow field of different cathodes are simulated．The analysis results show that the rectifying ring is favorable for the electrochemical machining. Finally, the cathode with rectifying ring is used in processing experiment, the edge of cutting zone is orderly, no spark and short circuit occurs. Straight line and circular hole is successfully processed. The feasibility of the scheme is proved.
Analytical Study on Microstructure and Mechanical Property in HAZ-Softened Weld Joint with High Heat Input of Low Carbon TMCP Steel
Authors: Mai Rong Zhi , Jiang Ze Xin , Ma Jin Jun , Zhang Yong Jun
Published: October 2017

Three types of low-carbon TMCP steels with different strength of the same carbon equivalent were welded by the flux-cupper back for SAW(FCB) method in this work. The microstructure, hardness and tensile strength of the FCB welded joints were studied. Softening phenomenon occurs in the heat affected zone of low-carbon content and low carbon-equivalent TMCP EH36 steel after high heat input welding. The softened zone is mainly depended on the strength of the base metal (BM), which appears on the fine-grain zone and incomplete crystallize zone of BM with relative low strength, and on the coarse grain zone of BM with high strength. The ratio of the tensile strength between each FCB joint and BM is the same of 0.98 as the same carbon and carbon equivalent content of 0.5% and 0.315% of BM, which is almost independent of the strength of BM. The tensile strength of the incomplete crystallize zone depends on the strength of the BM, which results in the improved strength of the whole softened zone with the increasing strength of base metal.
Structural and Optical Characteristics of Erbium Doped Ternary TeO2-TiO2-Bi2O3 Glasses
Authors: Baki S.O. , Tan L.S. , Kan C.S. , Halimah Mohamed Kamari , Mahdi M.A.
Published: October 2017

In this work we investigated both structural and optical characteristic of erbium doped ternary TeO2-TiO2-Bi2O3 tellurite oxide based glasses, synthesized via melt-quench method. The X-ray diffraction (XRD) and differential scanning calorimetry (DSC) confirmed its glassy nature and stability. Raman analysis revealed the presence of various coordination state TeO2 network consisting stretching/bending vibrations of Te-O bonds in the [TeO4] trigonal bi-pyramid units and fraction of [TeO3, TeO3+1] trigonal pyramids. From optical absorption measurement both optical band gap and Judd-Ofelt analysis (intensity parameters Ωt(t=2, 4, 6), transition probabilities, and radiative lifetimes of the Er3+ ions) have been performed for both host and doped glasses respectively. Photoluminescence studies for upconversion and near-infrared emissions analysis (under 980 nm excitation at room temperature. Both optical transition mechanism which involved nonradiative energy transfer between Er3+ ions through cross-relaxation and energy migration were also explained in detailed.
Structural Properties of Erbium Doped Tellurite Glass Embedded with Natural Ferrite Oxide Nanoparticles
Authors: Anigrahawati Puzi , Sahar Md Rahim
Published: October 2017

Natural ferrite oxide nanoparticles (NPs) embed with tellurite glasses ((89-x) TeO2-10ZnO-1Er2O3-(x)Fe3O4, (x = 0 – 0.8 mol %)) were prepared by conventional melt quenching method to study the influence of the Fe3O4 NPs concentration on the stuctural properties of the glass. Studies on these glassy materials characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and RAMAN spectroscopic measurements are presented. It is observed that the amorphous nature of the glass is confirmed by x-ray diffraction. The FTIR studies support the formation of Te-O-Fe linkages. The FTIR spectra reveal modification in network structures evidenced from vibrational wave-number shifts of TeO4 and TeO3 structural units. Raman spectroscopy have been manipulated to observe the structural modification of [TeO4] trigonal bipyramidal structural unit.
Effect of Degussa P25 on the Morphology, Thickness and Crystallinity of Sol-Gel TiO2 Coating
Authors: Musa Muharniza Azinita , Juoi Jariah Mohamad , Mohd Rosli Zulkifli , Johari Nur Dalilah
Published: October 2017

The deposition of titanium dioxide, TiO2, films on various substrates was studied in order to take benefit of its antimicrobial properties for suitable application in related fields. In this paper, the effect of Degussa P25 (a commercial TiO2 nanoparticles additive in the sol) on the morphology, thickness and crystallinity of the deposited TiO2 was investigated. TiO2 films, without and with Degussa P25, were deposited on glass slides and unglazed ceramic tiles via sol-gel process. Films were deposited ten times using dip coating technique and heat treated at 500°C for 1 hour. The coating morphologies and thickness were analyzed using Scanning electron microscope (SEM), while the crystalline phases were characterized using Glancing angle X-ray Diffraction (GAXRD). Results show that the addition of Degussa P25 produces coating with homogeneous morphology and less cracks, thicker film and promotes the presence of anatase and rutile phases. It was also observed that the deposition of TiO2 with Degussa P25 on unglazed ceramic tile produced thicker film (~120mm) as compared to the film deposited on glass slide (~7mm). Thus, it can be concluded that the addition of Degussa P25 affect the morphology, thickness and crystallinity of the TiO2 coatings, whereas the type of substrate only affects the coating morphology and thickness, but not the crystallization of the TiO2 coating.
Luminescent Properties of SiC Thin Film Deposited by VHF-PECVD: Effect of Methane Flow Rate
Authors: Albert Alim Emilly , Omar Muhammad Firdaus , Ismail Abd. Khamim
Published: October 2017

Bulk silicon carbide (SiC) as light emitter is less efficient due to its indirect bandgap. Therefore, nanosized SiC thin film fabrication approach enable emission wavelength shifts due to spatial confinement. The result of luminescent study of SiC thin film deposited via very high frequency plasma-enhanced chemical vapour deposition (VHF-PECVD) are presented. Precursor gasses used were silane and methane. Methane flow rate was varied from 8 sccm to 20 sccm while other parameters were maintained. Raman spectral analysis denotes the quantum confinement effect occurrence in proportion to the methane flow rate increment. The luminescence properties of the deposited SiC thin film ranging from highly green emission (~518 nm) to highly UVB emission (~294 nm) dominant luminescence. Broad blue emission band shifted toward higher wavelength with smaller FWHM as methane flow rate is increased. This results enable the possibility of luminescent SiC thin film applications in photonics and electronic integration as blue light sources.
Growth of ZnO Nanowires by Vapour Solid Mechanism
Authors: Akhiruddin N. , Muhammad Rosnita , Wahab Yussof , Ibrahim Zuhairi
Published: October 2017

The growth of zinc oxide nanowires is further investigated by thermal evaporation method and is discussed with respect to vapour-solid (V-S) growth mechanism. In this paper, ZnO nanowires were synthesized on glass substrate without the use of any catalyst with a constant flow of argon gas 1.36 psig and oxygen gas of 0.34 psig. Zinc powder of 99.99% purity is placed in a horizontal furnace and exposed to temperature of 600°C for 90 minutes. The surface morphology of the deposited zinc oxide is investigated by the atomic force microscopy (AFM) images and it was found that the deposited ZnO has a rough surface while field-emission scanning electron microscopy (FESEM) confirms the morphology of the ZnO nanowires. Photoluminescence (PL) spectra indicate that the optical quality of the deposited structure is potentially excellent with high energy excitonic emission close to the band edge which is assigned to the surface exciton in ZnO at 3.4eV.
Structural and Thermal Characterization of Antimony-Phosphate Glass
Authors: Moustafa S.Y. , Sahar Md Rahim , Ghoshal Sib Krishna
Published: October 2017

A new ternary glass systems of composition xSb2O3-(75-x) P2O5-25MgO, where x = 30, 40, 50 mol%; has been prepared via melt-quenching method. Synthesized glasses are characterized using XRD, FESEM, EDX, and TG/DTA measurements. The influence of varying Sb2O3 concentrations on their thermal properties and crystal structure is evaluated. The XRD patterns confirmed the amorphous nature of samples. SEM images demonstrated interesting phase formation with ribbons-like texture. Three crystalline phases were observed in this glass series which are antimony phosphate, antimony orthophosphate and cervantite. EDX spectra detected the approximate percentage of the raw elemental traces. Thermal analysis of these glasses revealed their high-molecular polymer character for Sb2O3 content at 50 mol%. Three different glass transition temperatures are achieved with three different composition each, which are (276, 381, 422 °C) at x=30 mol%, (276, 381, 470 °C) at x=40 mol% and (276, 381, 443 °C) at x=50 mol%. Furthermore, the solidus and liquidus temperature are found to decrease with increasing Sb2O3. This observation may open up new research avenues for antimony based ternary glasses.
Morphological of Yttrium Stabilized Zirconia (YSZ) Thin Film of Electrolyte in Solid Oxide Fuel Cell Application
Authors: Rahimi N.F.M. , Wahab Yussof , Muhammad Rosnita
Published: October 2017

Recently, the performance of solid oxide fuel cell is focused on lowering operating temperature (400°C-650°C). To achieve the goal, the thickness of commonly used electrolyte, YSZ was reduced. The dip-coating technique was used for preparing dense YSZ electrolyte thin films on glass substrate. The suspensions were prepared by sol-gel method. Polyvinyl alcohol (PVA) and polyethylene glycol (PEG) was used as a ceramic binder and plasticizer, respectively. Crystalline structure and morphology of thin films were analyze by X-ray diffraction (XRD) and Atomic Force Microscope (AFM). The XRD reveals that crystallization of YSZ phase does not occur at any sintering temperature but can only have a small peak at 2θ = 30° as the thickness of layer increase. The roughness and morphology of the film with different thickness were observed. The roughness increased as the thickness increased.
Electrical Analysis of Cornstarch-Based Polymer Electrolyte Doped with NaCl
Authors: binti Shahrudin Syakirah , Ahmad Azizah Hanom
Published: October 2017

Corn starch (CS) – sodium chloride (NaCl) based polymer electrolytes were prepared by solution casting technique. At room temperature, CS-NaCl film with ratio of 70 wt. % - 30 wt. % demonstrates the highest ionic conductivity in the range of (1.72 ± 0.12) x10-5 Scm-1. Temperature-dependence ionic conductivity study follows Arrhenius model and using related plot, the activation energy for highest conducting composition is 0.16eV. The transport number measurement studies confirmed that the ionic conductivity of this polymer electrolyte is due to ions. Fourier transform infrared spectroscopy (FTIR) analysis proved the interaction between CS and NaCl.
Improved Self-Cleaning and Spectral Features of Erbium Doped Tellurite Glass with Titania Nanoparticles Sensitization
Authors: Yusof N.N. , Ghoshal Sib Krishna , Arifin Ramli
Published: October 2017

The effects of Titania nanoparticles (TiNPs) sensitization on the self-cleaning, spectral, and physical properties of erbium-doped tellurite glass were determined. Five glass samples with composition (69-x)TeO2-20ZnO-10Na2O-1Er2O3-(x)TiO2, where x = 0.0, 0.1, 0.2, 0.3 and 0.4 mol% were synthesized using melt quenching method. XRD pattern confirmed the amorphous nature of prepared samples and TEM images manifested the growth of nearly spherical TiNPs of average size ≈14 ± 1 nm inside the glass matrix. The observed decrease in the water contact angle from 68o to 43o with increasing TiNPs contents was ascribed to the increase of glass surface hydrophilicity. Meanwhile, enhanced degradation rate of methylene blue (MB) with increasing TiNPs contents up to 0.2 mol% indicated an improved photocatalytic activity of the glass sample. The UV-Vis-NIR absorption spectra exhibited ten significant bands of Er3+ ions. Two plasmon absorption bands were evidenced at 552 and 580 nm. The green band in the photoluminescence spectra of sample containing 0.2 mol% of TiNPs showed highest enhancement factor of 30 times. It is established that the present glass composition is prospective for making self-cleaning surfaces and other display devices.