bluuebunny/crossref_metadata_2025 huggingface dataset:
Disparités locales et crise économique éclairages préliminaires
Authors: Gaffard Jean-Luc , Nesta Lionel
Published: January 2016

L’étude empirique des zones d’emploi sur données d’entreprises montre que les performances de ces zones ne sont exclusivement attribuables ni à leur structure sectorielle ni à la phase du cycle économique. Il existe des effets propres à chaque territoire qui expliqueraient valeur ajoutée, investissement et emploi. Ces effets s’inscrivent dans un contexte de changement structurel qui se dessine au détriment des industries manufacturières et au bénéfice des activités dites de services de haute technologie.
Community-Engaged GIS for Urban Food Justice Research
Authors: Pettygrove Margaret W. , Ghose Rina
Published: January 2016

GIScience research has enhanced citizen engagement through advancements in web-based geospatial techniques and qualitative GIS methodologies, which provide opportunities for new forms of knowledge production. This paper draws on two interrelated approaches to demonstrate the ways qualitative GIS and Web 2.0 can provide nuanced analysis and foster collaborations to advance, in particular, food justice goals, which include developing equity in access to quality nutritious foods. First, the authors create a multicriteria food environment index utilizing GIS-based multicriteria modeling to represent food environments as constituted by multiple food sources and access dimensions. This enables visualization of food environment quality and indicates that food environment quality varies within a single neighborhood. Second, they utilize web GIS technologies to capture and visualize volunteered geographic information about urban food environments, demonstrating the importance of citizen perspectives to developing more nuanced understandings of these environments.
Optimizing School Bus Stop Placement in Howard County, Maryland
Authors: Galdi Michael , Thebpanya Paporn
Published: January 2016

In the current system, school bus stops in Howard County, Maryland are manually placed along the school bus routes based on safety, cost-efficiency, and many other variables. With such liberal placement, bus stops are sometimes placed unnecessarily. This issue is prevalent in many school districts and often results in needlessly close bus stop proximity. In this study, the authors implemented a GIS-based heuristic to assist school officials in optimizing their districts bus stop placement. They also estimated the proportion of county-wide bus stops that could be eliminated by this approach. Following the constraints determined by State and local guidelines, the ArcGIS Network Analyst Extension was used to identify unnecessary bus stops across the study area. The initial output was re-evaluated by school officials in order to determine if those bus stops would be eliminated. The results indicate that approximately 30% of the existing bus stops were marked as “candidates for elimination” by the GIS process. After a review of these candidates, it was determined that at least 15% of the total school bus stops could be eliminated. Statistical estimates lent credence to the benefit of a re-evaluation of these bus stops. The method developed in this study can easily be replicated. Hence, it may inspire other school systems to exercise the same approach. Additionally, the results provide a gateway for future studies in examining more efficient school bus routes with less travel time, as well as investigating how much the carbon footprint of school bus fleets can be reduced.
Developing a Compendium of Ideas on Using the Retrospective Approach to Mine for GIS Nuggets
Authors: Wellar Barry
Published: January 2016

The compendium of ideas paper addresses two needs: 1) Involving more people in the GIS retrospective program; 2) Creating an initial compilation of ideas which promote mining the various literatures – public, learned, popular (media), professional, etc. – for nuggets such as new ways to add to GIS technology, new reasons to add to geospatial information, and, new uses of GIScience research methods. Four design principles (connecting “ideas” and “nuggets”, using a modular approach, limiting modules to those critical to launch the project; and making it easy to modify modules) provide clear directions throughout the compendium-building process. And, each of the four modules (ideas about doing; ideas about objects of attention; principal GIS components as ideas and spawners of ideas; and, ideas as questions and questions as ideas) can be oriented to pursue general or particular interests that are held by all users of GIS technology and GIScience methods, techniques, and operations.
Interactive Visualization Tools to Improve Learning and Teaching in Online Learning Environments
Authors: Kuosa Kirsi , Distante Damiano , Tervakari Anne , Cerulo Luigi , Fernández Alejandro , Koro Juho , Kailanto Meri
Published: January 2016

This paper presents two interactive visualization tools for learning management systems (LMS) in order to improve learning and teaching in online courses. The first tool was developed at the Intelligent Information Systems Laboratory (IISLab) at the Tampere University of Technology (TUT). The tool is used to analyse students' activity from automatically recorded user log data and to build interactive visualizations. They provide valuable insights into the learning process and participation of students in a course offered to teachers and students. The second tool was developed at the Unitelma Sapienza University. It extends navigation and search functionalities in the discussion forum of an LMS with a topic-driven paradigm. The tool analyses forum content and automatically identifies discussion topics. It then enhances the original forum with a topic-driven navigation structure and an interactive search graph. Both tools have been developed as plug-ins for the Moodle LMS, but their analysis processes and techniques can be adopted into any LMS.
Technologies for Interactive Learning and Assessment Content Development
Authors: Gusev Marjan , Ristov Sasko , Armenski Goce
Published: January 2016

Recent technology trends evolved the student assessment from traditional ones (“pen-and-paper” and “face-to-face”) to modern e-Assessment system. These modern approaches allow the teachers to conduct and evaluate an exam with huge number of students in a short period of time. Even more important, both the teacher and the students achieve the evaluation results immediately after the assessment has finished. Although the e-Assessment system speeds up the evaluation, teachers face a huge challenge to prepare, organize and generate a huge set of questions. The questions must cover all learning objectives and their number should be as large as possible to prevent cheating by guessing or memorization of correct answers from previous exams. This paper presents several technologies that can efficiently realize strategies to develop a huge question database with minimal teacher efforts. It also describes the methodologies and strategies based on a specific technology. The technologies are categorized in two classes of e-Assessment systems that are used at the authors' faculty: the traditional e-Assessment system with usual multiple-choice answers and the newest e-Assessment system with interactive images. The question generation is based on defining the questions and answers as XML files (for more advanced users) and MS Word-based files (for users with basic IT background). The question database can be used both for efficient and effective e-Assessment and e-Learning.
An Enterprise Management Decision Making System based on Possibility Theory
Authors: Asadi Mounes , Fazlollahtabar Hamed , Shirazi Babak
Published: January 2016

One of the substantial problems in large scale enterprises is lack of the integrity of the operational systems. The information flow among different departments is aiming at integrating data, applications and business processes in an organizational platform. In this research, the authors propose to design a process of decision support system for the integration of three corporate units: purchasing, sales and production. Here, they examine the process in two steps of information flow in each enterprise unit for decision making. While in the second step and according to data from the previous step and due to the uncertainty in the enterprise data it was determined to implement the rules of the system by the possibility theory. Thereby, the events that have effective role in the integrity of organization for each unit are known and enterprise should focus on them to achieve goals. Also, to use actual data of enterprise and to be able to use the results of the work objectively, the authors conducted a case study for implementation purpose.
Enhancing RCIES Model
Authors: Makki Arwa Mukhtar , Ahmed Tarig Mohamed
Published: January 2016

Risk identification and prioritization is very essential activity in any successful strategic risk management process. Developing a plan for dealing with such problems reduces the impact of unexpected risks and failures while prioritizing risks draws attention, efforts and resources to the risks with great impact on projects success. The aim of this paper, is to identify the critical risk factors in an ERP project through a case study of a successful implementation of an ERP system in a Sudanese organization and to understand how the organization implemented the appropriate controls to minimize its business risks impact. To achieve this objective, a number of key articles were reviewed and analyzed to understand the different critical risk factors influence ERP implementation. New risk factors and controls influence ERP implementation have been identified. A new model of ERP implementation critical risk factors was developed. Furthermore, the risk factors were classified into categories, probability, impact and proximity, then using a prioritizing tool, the results of this study contributes to risks identification and prioritization by pointing to the less priority and the most critical risk factors.
Cuckoo Search Algorithm for Minimization of Power Loss and Voltage Deviation
Authors: Le Dung A. , Vo Dieu N.
Published: January 2016

This paper proposes a cuckoo search algorithm (CSA) to solve the optimal reactive power dispatch (ORPD) problem in power system operation considering the power loss and voltage deviation. The proposed CSA is a nature inspired algorithm from the cuckoo species laying their eggs in the nest of other species. There is a probability of the host bird to discover the alien eggs in its nest and the host bird either destroys the strange egg or simply ignores the host and builds a new one. The advantages of the CSA method are few control parameters and high optimal solution quality. The proposed method has been tested on the IEEE 30 bus system and the result comparison has indicated that the proposed method can obtain better solution quality than many other methods. Therefore, the proposed CSA method can be an alternative method for solving the ORPD problem.
A Project Risk Management Methodology Developed for an Electrical Portuguese Organization
Authors: Peixoto Joana , Tereso Anabela , Fernandes Gabriela , Almeida Rui
Published: January 2016

This paper resulted from an action-research undertaken on a Portuguese electric energy organization – EDP Distribution. The research aimed to develop, propose and implement a risk management methodology to integrate in the project management (PM) practices of an ongoing project. The methodology implemented allowed the project team to initiate systematized risk management practices through a simple structure, easy to apply, and with a degree of complexity compatible with the effort that the PM team could initially engage. It is expected that the proposed methodology signaled the initiation of the project risk management (PRM) process standardization in the EDP Distribution organization.
Simultaneous Usage of Methods for the Development of Experimental Competences
Authors: Alves Gustavo , Viegas Clara , Lima Natércia , Gustavsson Ingvar
Published: January 2016

This work reports a didactical implementation addressing the development of students' competences on DC circuits. Teacher' approach focus on the use of simultaneous teaching/learning/assessment resources and methods in order to improve students' abilities of adapting and dealing with available tools to solve real practical problems. The impact this didactical implementation was measure in terms of students' perception, usage and learning results. The results indicate that students clearly benefit from the use of virtual resources, in developing their skills, including the associated calculus, although the majority of students do not immediately understand it. This design represents a long-term vision, and, with some adjustments, some identified in this work, this course may become more effective in improving students' learning.
Female Lecturers' Perception of ICT Integration for Teaching and Learning in University of Ibadan, Nigeria
Authors: Adetimirin Airen
Published: January 2016

Deployment of Information and Communication Technology (ICT) for teaching and learning affords learners' flexibility in learning such that they can learn as individuals or groups. The dissemination of information by lecturers to learners will also be facilitated by the use of ICT. The University of Ibadan designed a courseware development programme for 20 female lecturers to improve the use of technology for teaching and research. Data was collected using a questionnaire, interview and secondary data. Results revealed that the lecturers found the programme very relevant, appropriate but demanding. The major challenges were limited access to some of the technologies, fluctuation in internet connectivity and poor ICT literacy skills. Improvement in the level of ICT use requires the development of relevant infrastructure and ICT literacy training which were identified as critical for its successful deployment.
Impact of Automated Software Testing Tools on Reflective Thinking and Student Performance in Introductory Computer Science Programming Classes
Authors: Fridge Evorell , Bagui Sikha
Published: January 2016

The goal of this research was to investigate the effects of automated testing software on levels of student reflection and student performance. This was a self-selecting, between subjects design that examined the performance of students in introductory computer programming classes. Participants were given the option of using the Web-CAT software-testing tool to evaluate their computer code. Student self-reported levels of reflection were measured using reflective thinking survey.
Lessons in Copyright Activism
Authors: Hobbs Renee
Published: January 2016

Digital learning is being transformed by changes in copyright law. This article discusses the author's personal journey as a copyright education activist through two rounds of rulemaking proceedings before the Copyright Office concerning the anti-circumvention provisions of one part of the copyright law, the Digital Millennium Copyright Act (DMCA), which is the law that exempts YouTube and other ISPs from liability from copyright claims and criminalizes the circumvention of digital rights management (DRM) software that protects DVDs from being copied. Every three years, petitioners can claim their rights have been compromised by the current law; the Copyright Office pores over the petitions, weighs the pros and cons, and then offers recommendations to the Librarian of Congress, who ultimately grants or denies the exemptions. The author was successful in expanding the rights of K-12 teachers to legally “rip” DVDs by using the Section 1201 rulemaking process, which is one of the only significant ways that educators can expand their rights to use copyrighted material for teaching and learning purposes. By asserting the rights of K-12 educators to circumvent encryption to make fair use of copy-protected DVDs and online digital media for teaching and learning, the law begins to move beyond the needs of large-scale content owners to include the rights of educators and students.
Utilizing Twitter for Concept Learning
Authors: Buzzelli Armand , Holdan E. Gregory , Rota Daniel , McCarthy John
Published: January 2016

Despite the perception that face-to-face classrooms provide speaking opportunities, studies by , , and have conveyed that there is limited interaction in a traditional college lecture setting. Social media networks such as Twitter provide an opportunity for instructors to utilize popular mobile technology to create a discussion beyond the classroom. Twitter's 140-character maximum creates an efficient method of communication that can be spaced over time. Spacing practice has the potential for improving classroom learning (). This mixed-methods study utilizing a convenience sample tested if Twitter could serve as a more effective method of review than a traditional paper study guide in an introductory college history course. No significant differences were found in in the posttest performance of both groups. Participants found Twitter easy to use, were unconcerned about their privacy on social media, and reported that Twitter did not increase student engagement when used only as an information distribution tool.
Information Security Compliance Behaviour of Supply Chain Stakeholders
Authors: Shafiu Ibrahim , Wang William Yu Chung , Singh Harminder
Published: January 2016

Supply chain security is an emerging topic in the supply chain management literature. Information security is a key component of supply chain security, and this study aims to identify the factors that influence the compliance behaviour with respect to information security. A related objective is to understand the extent to which compliance was substantive or symbolic. Adopting a qualitative approach, the authors conducted semi-structured interviews with stakeholders based in New Zealand who are involved in international supply chains. The interviews find that compliance behaviour is affected by the influence of other organizations, organizational perceptions of compliance, and the rules and norms of exchange in different contexts. The results also indicate that compliance behaviour is more symbolic than substantive in the supply chain environment.
Together We E-Export
Authors: Vlachos Ilias P. , Gutnik Sandra
Published: January 2016

This study examined the horizontal collaboration of small and medium companies (SMEs) in export food supply chains facilitated by the use of electronic business tools. A multi-case study of three best-practice Austrian food SMEs examined the practices of horizontal collaboration in global supply chain management. Then, a survey of Austrian food SMEs assessed the horizontal collaboration facilitators and inhibitors. Findings demonstrate that e-business tools foster the creation of virtual alliances and help SMEs to increase export sales to new and/or niche foreign markets. SMEs have limited resources to overcome obstacles like cost restrictions to use advanced yet expensive e-business tools, managing food safety risks in global supply chains, and meet legal requirements of international trade.
Research on Distribution of Hobbing Machine Spare Parts with Time Limits
Authors: Linqiao Hu , Ping Yan , Fei Jia , Qiang Zhou
Published: January 2016

Distribution of hobbing machine spare parts is a key factor to improve the efficiency of service-oriented spare part allocation. In order to minimize the distribution route, the distribution model of hobbing machine spare parts with time limits was put forward. The modified savings algorithm was adopted to solve the model. To improve the loading rate of classic savings algorithm, the modified savings algorithm allowed the split delivery according to customers' requirements. A case study verified that the application of modified savings algorithm ensured the shortest distribution route and improved the vehicle loading rate.
Managing an Engineering Project
Authors: Rahman Nayem , Wittman Alexis , Thabet Sallam
Published: January 2016

This article provides an overview of the comprehensive process in creating a “Project Plan” for an engineering project. The authors discuss the challenges of project management tasks, tools, and methods used. They also discuss and compare other commonly used project planning practices and techniques. This article includes authors' experiences drawn from their careers and industries that are applicable to projects of this nature. They propose methodical approaches to handle a large, and complex engineering and construction project that takes several years to complete. The project selected is a hypothetical biomass engineering plant considered for this examination.
Differentiating between Leadership Competencies and Styles
Authors: Ahmed Riaz , Azmi bin Mohamad Noor
Published: January 2016

Literature reveals a number of confusions within the area of project management regarding the use of terminology and differing interpretations, concerning leadership competencies and leadership styles. In project management literature, many empirical studies have examined the influence of leadership competencies or styles, but yet any substantial review study has rarely been conducted to differentiate between leadership competencies and styles. This study aims to differentiate between leadership competencies and leadership styles in project management literature. This study found that the project manager's leadership terms including competence, competency, competencies, and styles have frequently been used in project management literature. Furthermore, literature has been synthesized to provide more familiarity and understanding on leadership competencies and styles. Findings indicate that leadership competencies and styles are two different things but a few characteristics are common between both the terms. Furthermore, leadership competencies are more suitable for task-oriented activities and leadership styles are more appropriate for relationship-oriented factors. This study has implications for the future directions to identify differences between project manger's average and superior performance through comparison of leadership competencies and styles.
Impact of Trust on Communication in Global Virtual Teams
Authors: Lohikoski Päivi , Kujala Jaakko , Haapasalo Harri , Aaltonen Kirsi , Ala-Mursula Leena
Published: January 2016

This study aims to research the impact of impersonal and interpersonal trust on communication among virtual teams. A multi-method case study was conducted, with data provided by 94 organisation members in a global telecommunication company with a long history of virtual ways of working. The case study consisted of semi-structured interviews, an electronic survey, focus group interviews and document reviews. The main finding is that impersonal trust is essential for the development of interpersonal trust in virtual teams (VTs) and for communication among VTs. Furthermore, strong interpersonal affective trust among employees within each site negatively affects VTs' communication. This study suggests that the role of impersonal trust is more significant in virtual organisations than in regular organisations because impersonal trust acts as an enabler for the development of interpersonal trust and affects communication in VTs at a fundamental level. Results from previous studies are contradictory. Theoretically, the field of communication and trust in virtual teams is still in its infancy. This paper is a thorough multi-method study about the impact of impersonal and interpersonal trust on communication.
Risk Analysis for Knowledge Sharing in Tax Payment
Authors: Kazemi Zahra , Samimi Ahmad Jafari , Fazlollahtabar Hamed
Published: January 2016

One way to finance government expenditures is to collect taxes. Regarding to this financial source compared with other sources positive tax knowledge sharing amongst people or tax payers lead to effective investment. Unlike developing countries in developed countries - that taxes have little effects - almost all government expenditures is financed by taxes. One of the main challenges in the tax system is how to collect taxes due to tax evasion. The main reason is the uncertainty surrounding how government uses the taxes paid by the people. A major factor in the outbreak of the sense of failure to pay taxes, is the discussion and sharing the viewpoint of each other. If there is any positive tax effect prevalence of speech among people motivate them to pay more and if not, paying taxes is impaired. Therefore in order to avoid disorderliness in paying taxes that lead to a reduction in the development growth rate of investing taxes in industry and services sectors procedures should be designed so that taxes spread in speech with more quality. In this article five categories that people share their knowledge about them with each other, have been proposed. Defining risk structure and using data from surveying form the risk values of tax payment the results indicate that sharing tax knowledge amongst people have positive effects on tax payments.
A Hybrid Approach Using Maximum Entropy and Bayesian Learning for Detecting Delinquency in Financial Industry
Authors: Kumar Dharminder , Arora Suman
Published: January 2016

The use of credit card has increased tremendously in the past few years because of the boom in the economy which has also resulted in the increase in the credit card fraud cases. Various leading banks and software development companies worldwide are taking serious measures to deal with the gravity of this situation. This paper proposes a framework for credit card fraud detection that will detect frauds using maximum entropy according to the irregular behavior of the customers in various transactions of credit card. The comparative study of above approach with existing approaches is also addressed. Results show the feasibility and validity of each approach.
Electroless Nickel-Phosphorus Composite Coatings
Authors: Gadhari Prasanna , Sahoo Prasanta
Published: January 2016

Electroless nickel composite coatings possess excellent mechanical and tribological properties such as, hardness, wear and corrosion resistance. Composite coatings can easily be coated not only on electrically conductive materials but also on non-conductive materials like as fabrics, plastics, rubber, etc. This review emphasizes on the development of electroless nickel composite coatings by incorporating different types of hard/soft particles (micro/nano size) in the electroless Ni-P matrix to improve the mechanical and tribological properties of the coatings. The preparation of electroless bath for nickel-phosphorus composite coating, methods to incorporate hard and/or soft particles in the bath, factors affecting the particle incorporation in the coating and its effect on coating structure, hardness, wear resistance, friction behavior, corrosion resistance, and mechanical properties are discussed thoroughly.
Usability in Local E-Government
Authors: Yildiz Mete , Ocak Nihan , Yildirim Caglar , Cagiltay Kursat , Babaoglu Cenay
Published: January 2016

Social media use is on the rise throughout the world. Influenced by this trend, governments of all levels and sizes are establishing their social media (like Facebook) presence due to the communication and interaction capabilities that such a presence brings. This study examines and explains the social media presence of Turkish local governments from a usability perspective. Usability studies provide governments with important empirical data about the citizens'/users' view/perception of the efficiency, effectiveness and satisfaction of web-based content. Consequently, there is a need for usability testing of government social media services.The analysis of local government social media sites through scientific usability methods, such as expert review, guidelines and eye-tracking, reveals the strengths and weaknesses of government social media services in terms of usability. The study concludes with specific recommendations for improvement of government social media presence, which are applicable, to a great extent, to governments of all levels and sizes in Turkey and elsewhere.
Tackling the Digital Divide
Authors: Liptrott Mark
Published: January 2016

A focus of daily life in the UK now revolves around the adoption of technology and the impact of Internet based technology raises issues of the digital divide, knowledge divide, social empowerment and socio economic effects. This paper focuses on the impact of the UK government's policy, ‘digital by default', on individuals with limited IT skills living in an area of deprivation. Following a review of prior research, the paper analyses data from semi structured interviews with progression support workers in their roles supporting individuals in their use of computers to find employment. Research results identify barriers inhibiting individuals from using IT and the discussion reflects whether the inclusion of concepts of Rogers' Diffusion of Innovations theory into the design of the ‘digital by default' policy has the potential to address the digital divide. The Conclusion draws on the research results to recommend a revised policy strategy.
Quantitative Approaches to Representing the Value of Information within the Intelligence Cycle
Authors: Smith Christopher M. , Scherer William T. , Todd Andrew , Maxwell Daniel T.
Published: January 2016

The authors propose that valuation of information metrics developed near the end of the intelligence cycle are appropriate supplemental metrics for national security intelligence. Existing information and decision theoretic frameworks are often either inapplicable in the context of national security intelligence or they capture affects from inputs aside from just the information or intelligence. Applied information theory looks at the syntactic transmission of information rather than assigning it a quantitative value. Information economics determines the market value of information, which is also inapplicable in a national security intelligence context. Decision analysis can use the value of information to show the expected value of perfect information (EVPI) and the expected value of imperfect information (EVII) and although this method can be used with utility theory and not just monetary objectives, it has been shown that decision makers within the intelligence community (IC) have difficulty agreeing upon how to value objectives within analysis. Additionally, it is difficult to determine how decision makers use intelligence in the decision-making process, which makes existing decision theoretic methods problematic, and might include inputs from variables besides just the intelligence.
Comparing Predictive Ability of Classifiers in Forecasting Online Buying Behaviour
Authors: Prashar Sanjeev , Mitra S.K.
Published: January 2016

With Internet invading geographic boundaries and diverse demographic strata, online shopping is growing at exponential rate. Expected to grow by 45 per cent to $7.69 billion by the end of 2015, India's ecommerce market has emerged as one of the most anticipated destinations for both multinational and domestic retailers. Since their success will depend on their ability to attract shoppers to buy online, it becomes relevant for them to decipher Indian consumers' attitude and behaviour towards online shopping and to predict online buying potential in India. The effectiveness of marketing and promotional strategies and action plans also will have to be pivoted around the potential available in the market. This empirical study explores the accuracy, precision and recall of four different classifying techniques used in predicting online buying. The forecasting ability of logistic regression (LR), artificial neural network (ANN), support vector machines (SVM) and random forest (RF) in the context of willingness of shoppers' to buy online has been compared. Analysis of the data supported most of the predictions albeit with varying level of accuracy. The outcome of the study reflects the superiority of artificial neural network over the other three models in terms of the predicting power. This paper adds to the knowledge body for online retailers in reducing their vulnerability with respect to market demand and improves their preparedness to handle the market response. Managerial implications of the findings and scope for future research have been deliberated.
The Relationship between Purchase Intentions and Recommend Intentions in Assessing Market Potential for Graduate Degree Programs
Authors: Roszkowski Michael J.
Published: January 2016

The Net Promoter Score® (NPS) system measures recommend intentions on an 11-point scale that is then collapsed into three ranges: 0 – 6 (Detractors), 7 – 8 (Passives), and 9–10 (Promoters). With a five-point scale, the equivalent pooling scheme is 1-3 = Detractors, 4= Passives, and 5= Promoters. Questions can be raised about the strength of the predictive ability of the recommend intention and the method of pooling of ratings. In two market potential studies for proposed graduate programs, five-point recommend intentions and purchase intentions were used to gauge interest. The recommend intentions were collapsed into the unbalanced NPS categories and into a more conventional balanced scheme (1-2, 3, 4-5). In each data set, the uncollapsed (five-point) recommend intention and the two collapsed (three-point) recommend intention ratings were then correlated with the five-point purchase intention. All correlations were low, which points to non-redundancy between recommend and purchase intentions, and suggests the need for both metrics in studying market potential. The NPS-style collapse did not improve the magnitude of the association.
How Do Institution-Based Trust and Interpersonal Trust Affect Interdepartmental Knowledge Sharing?
Authors: Yuan Xinwei , Olfman Lorne , Yi Jingbing
Published: January 2016

There are two typical forms of trust in organisational settings—institution-based trust and interpersonal trust. The role of interpersonal trust in promoting interdepartmental knowledge sharing has been investigated. The effect of institution-based trust, especially the joint effect of institution-based and interpersonal trust, on interdepartmental knowledge sharing has not been adequately described. This article builds a conceptual model to describe the independent and joint effects of these two forms of trust on the satisfaction and success of interdepartmental knowledge sharing. The moderating role of knowledge tacitness is also described in this model, which is tested on 294 collaborative task scenarios between departments within Chinese IT firms. The empirical results essentially support the proposed model and contribute to organisational trust and interdepartmental knowledge-sharing discussions by clarifying the substantial roles of these two forms of trust in the context of interdepartmental collaboration and knowledge sharing.
Transient Analysis of Microchannel Heat Sink during Single Phase and Flow Boiling Conditions
Authors: Prajapati Yogesh K. , Pathak Manabendra , Khan Mohd Kaleem
Published: January 2016

In the present work, an experimental investigation has been made to analyze the performance of microchannel heat sink under transient operating conditions. The transient analysis has been made by estimating the response time for different input heat flux and coolant mass flow rate. Analysis has been made for rectangular cross-section microchannels fabricated on a copper block of size 25.7 × 12 × 10 mm3. Twelve (12) numbers of microchannels are fabricated in the copper block. The width and depth of individual channels are 400 μm and 750 μm respectively. Performance analysis has been made for both single phase and flow boiling conditions of the coolant flow using deionized water as coolant. Experiments have been performed for coolant mass flux (G) range of 90 - 250 kg/m2s and input heat flux (q) range of 20 - 300 kW/m2 respectively. It has been observed that at constant input heat flux, response time decreases with the increase in coolant mass flux during single phase cooling. However this trend is not strongly followed during the two-phase or flow boiling cooling condition.
Nanofluid in Thermal Transfer - Is it a Solution for the Future?
Authors: Mare Thierry , Estelle Patrice , Halelfadl Salma , Mohd-Ghazali Normah
Published: January 2016

In a global context of saving energy and the desire to improve heat exchangers, the use of nanofluids today seems like a craze growing. Are nanofluids a solution What are the limitations of the use of such fluids This article proposes a review of thermo physicals coefficients of carbon nanotube-water nanofluids. This article reports on an experimental study completed to observe the impacts of the concentration, temperature, aspect ratio, and surfactant on the thermal conductivity and viscosity. Finally this article advocates a field for using nanofluid in heat exchangers.
Simulation of Heat Flux Effect in Straight Heat Pipe as Passive Residual Heat Removal System in Light Water Reactor Using RELAP5 Mod 3.2
Authors: Kusuma M. Hadi , Putra Nandy , Widodo Surip , Antariksawan Anhar Riza
Published: January 2016

Heat pipe is considered being used as a passive system to remove residual heat that generated from reactor core when incident occur or from spent fuel pool. The present research is aimed to studying the characteristics of straight heat pipe as passive residual heat removal system. As an initial step, a numerical simulation was conducted to simulate the best experimental design set up being prepared for the next step of the research. The objective is to get the thermal hydraulic characteristic due to variation of heat flux of heat source. The thermal hydraulic RELAP5 MOD 3.2 code is used to simulate and analyze the straight heat pipe characteristics. Variations of heat flux are 1567 Watt/m2, 3134 Watt/m2, 4701 Watt/m2, 6269 Watt/m2, and 7837 Watt/m2. Water as working fluid is heated on evaporation section with filling ratio 60%. Environmental air with variation 5 m/s and 10 m/s of velocity are used as external cooler. Straight heat pipe used in the simulation is wickless with 0.1 m of diameter and 6 m of length. The results show that higher heat flux given to the evaporator section will lead to more rapid heat transfer and achievement of steady state condition. The increasing of heat flux leads to an increase of evaporation of the working fluid and of pressure built in the heat pipe affecting higher saturation temperature of working fluid. Heat flux loading must consider the velocity of air as heat removal in the condenser to prevent dry out phenomenon in the evaporator. Based on the results, given the experimental set-up, the optimum range of experimental parameters could be determined.
Heat Transfer Enhancement in a Microchannel Heat Sink with Trapezoidal Cavities on the Side Walls
Authors: Kuppusamy Navin Raja , Ghazali Nik Nazri Nik , Rahman Saidur , Omar Awang M.A. , Mohammed Hussein A.
Published: January 2016

The present study focuses on the numerical study of thermal and flow characteristics in a microchannel heat sink with alternating trapezoidal cavities in sidewall (MTCS). The effects of flow rate and heat flux on friction factor and Nusselt are presented. The results showed considerable improvement heat transfer performance micro channel heat sink with alternating trapezoidal cavities in sidewall with an acceptable pressure drop. The heat transfer rate has improved in the cavity area due the greater fluid mixing in fluid vortices and thermal boundary layer disruption. The slipping over the reentrant cavities and pressure gain reduces pressure drop appears as the reason behind of only minor pressure drop due to the cavities.
Study of a Heat Pump for Simultaneous Cooling and Desalination
Authors: Byrne Paul , Ait Oumeziane Yacine , Serres Laurent , Mare Thierry
Published: January 2016

Access to freshwater and energy resource management are two of the major concerns of the next decades. The global warming indicator, the decrease of rainfalls and the growing energy demand for cooling are correlated in the most populated agglomerations of the world. For industrial and social purposes, it seems vital to develop energy efficient systems for cooling and desalination. A heat pump can produce energy for space cooling and heat for desalination. Among the different desalination systems available, membrane distillation seems the most suitable solution to the condensing temperature level of a standard heat pump.This article presents the development of a model of heat pump for simultaneous cooling and desalination by air-gap membrane distillation. The model was first developed using EES software and validated with experimental results from our laboratory and from the literature. The desalination unit was then optimised by numerical means in terms of dimensions and operating conditions using a bi-dimensional model with Matlab. A coupled system with a heat pump was finally simulated. The objective is to estimate the freshwater production depending on the cooling loads of a refrigerator placed in a building submitted to the conditions given by a weather data file in the Trnsys environment. The energy consumptions are compared to those of a standard reverse osmosis plant producing the same amount of freshwater associated to a chiller of same cooling capacity as the heat pump. The results show that the heat pump for simultaneous cooling and desalination offers interesting perspectives.
Prospects for Use of Solar Thermal Energy in High-Temperature Process Heat Applications
Authors: Al-Ansary Hany
Published: January 2016

Concentrating solar power is a family of solar energy technologies that have been used for decades to produce power. These technologies have a unique advantage, which is the ability to store thermal energy for prolonged periods of time such that stable and dispatchable energy can be provided to the electricity grid. However, concentrating solar power has been recently losing market share to photovoltaic technology due to the former’s significantly higher initial cost. There are many efforts worldwide to develop innovative solutions that reduce the cost and/or increase efficiency of concentrating solar power systems. However, concentrating solar thermal energy already has great promising area of application that is still largely unexplored, and that is high-temperature industrial process heat. This study attempts to make the case for using concentrating solar thermal energy in process heat applications by examining the economic feasibility (represented by the levelized cost of energy) for three scenarios of deployment, where the temperature levels are 400°C, 550°C, and 700°C, respectively. The first scenario uses parabolic trough collectors, while the second uses a central receiver system, both with 12 hours of molten salt storage. The third scenario uses a central receiver system that employs the innovative falling particle receiver concept to push the operating limit to 700°C, and silica sand is used to store thermal energy for 12 hours. The location chosen for this analysis is Alice Springs, Australia, due to its high direct normal irradiance and the presence of mining industries in its vicinity. The analysis shows that all three scenarios have a lower levelized cost of energy when compared to natural gas. To further confirm these findings, the analysis needs to be extended to other locations to account for different solar resources and different economic constraints.
Performance of Ejector Refrigeration Cycle for Automotive Air Conditioning
Authors: Maziar Reza , Sumeru K. , Senawi M.Y. , Ani Farid Nasir
Published: January 2016

In this study, two experiments were performed, one with the conventional compression refrigeration cycle (CRC) and the other with an ejector refrigeration cycle (ERC). The CRC system for automotive air conditioning was designed, fabricated and experiments were conducted. The system was then retrofitted with an ejector as the expansion device and experiments were repeated for the ERC system. Calculations of the entrainment ratio, compressor compression ratio and coefficient of performance (COP) were made for each cycle. The calculations showed that ERC has some advantages over the CRC. In this study, an average improvement of 5% in COP has been obtained for the ERC compared with the CRC.
Impact of Adjacent Building on Outdoor Ventilation around a Layout of Two Buildings
Authors: Adinoyi Ayo Samuel , Mohd-Ghazali Normah , Mansor Shuhaimi
Published: January 2016

The outdoor air ventilation impact of a taller building in different configurations of a layout of two adjacent buildings is presented in this paper. The critical parameters investigated are the separation distance (S) between the buildings and the ratio of height of downwind building to that of the building upwind, herein referred to as building height ratio (HR). The aim is to explore intermediate spacing distances which may engender acceptable ventilation around the buildings. A three-dimensional (3-D) numerical simulation employing the Computational Fluid Dynamics technique which adopts the Reynolds-Averaged Navier-Stokes equation and the realizable k-ε turbulence model was used to study the turbulent flow field around the full-scale two-building configurations. Results show that velocity ratio generally increases with height ratio, indicating that more air motion is induced at the pedestrian level as the height of the downwind building increases. For each of the height ratios, there is a spacing distance at which the velocity ratio is highest. The spacing distances at which the maximum velocity ratio occurs for the various height ratios are proposed. The dimensionless air exchange rate generally increases with height ratio, indicating that greater quantity of air from within the cavity between the buildings is exchanged with air from outside the cavity, which should result in better air quality. The findings of the study demonstrate the importance of incorporating wind data of an urban area in formulating guidelines for layout of buildings.
Fluidization of Gas-Solid in Atmospheric Bubbling Fluidized Bed Combustor
Authors: Permatasari Rosyida , Mat Lazim Tholudin , Sukarnoto Tono , Supriyadi Supriyadi
Published: January 2016

The fluidization behavior of a non-reactive gas-solid in the ABFBC was studied. Experiments were conducted using laser based Particle Imaged Velocimetry (PIV) with B Geldart silica sand (diameter, Ø = 300 – 425 μm) in 2 m high cylindrical combustion chamber. The PIV was used to determine the particle velocity distribution in the combustion chamber. The experiments established the distribution of the sand along the height of the combustion chamber. Consequently, 3D CFD simulations were conducted using ANSYS FLUENT 13.0 software, of which their results were compared with the experimental counterpart. The comparison between the results of the developed CFD models and the experimental data showed very close agreement.
Temperature Distribution Analysis on Syngas Combustion in Microgas Turbine
Authors: Fadhil Siti Sarah Ain , Hasini Hasril , Mohd Jaafar Mohd Nasharuddin , Othman Nor Fadzilah
Published: January 2016

Gas turbines are capable to utlize variety of fuel including natural gas, fuel oils and synthetic gas. It has environmental advantages and thus gas turbines are favourable in the power generating industries. The use of synthetic gas or syngas may reduce the CO2 and NOx emissions. The efficiency of syngas is comparable with natural gas. With the current constrain on the environmental issues, the use of syngas in gas turbines has been increasing. Despite its many advantages, the study on the combustion characteristics still remains a challenge, due to its variety fuel components. This paper aims to discuss the CFD analysis on the flame and flue gas temperature distribution in a full scale microgas turbine operating on syngas. Three cases were simulated with variety of natural gas concentration. A base case firing natural gas (100% methane) was first established using actual operation. Validation on the combustion model is made by comparing the flame temperature distribution of methane with reasonable accuracy. Simulation results with syngas show similar flame temperature distribution as natural gas combustion. The average temperature is much dependent on the composition of methane in syngas. The highest temperature given by syngas is made from the highest methane composiotion.