bluuebunny/crossref_metadata_2025 huggingface dataset:
A Framework for Interfacing Unstructured Data Into Business Process From Enterprise Social Networks
Authors: Al-Thuhli Amjed , Al-Badawi Mohammed , Baghdadi Youcef , Al-Hamdani Abdullah
Published: March 2019

The increased number of Enterprise Social Networks (ESN) business applications has had a major impact on organizations' business processes improvements by allowing the involvement of human interactions to these process. However, these applications generate unstructured data which create barriers and challenges to offering the data in the form of web services in a SOA environment, which again impacts negatively the business process. In this context, the authors propose a framework to interface ESN unstructured data into BP using text mining techniques. The Term frequency-inverse document frequency is used as a weighting schema in this framework. After that, the cosine similarity and k-mean are utilized to find similar values from different documents and cluster documents into groups respectively. The result of the evaluation of the framework shows promising results for retrieving social unstructured data. These results can be published into the SOA enterprise service bus using the RESTful web services.
Integrative Learning Toward Social Responsibility in Teaching Engineering
Authors: Martín-Sánchez Domingo A. , García-Laso Ana , Muñoz-van den Eynde Ana , Lopera-Pareja Emilia H. , Cornejo-Cañamares María , Muñoz-Ruiz Emilio
Published: March 2019

Technical University of Madrid, within the Spanish context, has profited of the introduction of a System of Internal Quality Assurance to build a road on the grounds of previous work on the culture of ethics in engineering. This way may drive the students training to incorporate in their curricula instruments leading to the recognition and acquisition of social responsibility. The road is paved with various educational elements, either mandatory such as the Mentoring project (aiming to minimize the gap in the transit between high school and university from a logistical point of view), or optional such a set of three: Monitoring (a system of academic support for improving the performance of in the students in their learning outcomes when face difficulties), Service Learning and Social Entrepreneurship, Ethics and Values in Engineering. This strategy combined with the convergence to the European Higher Education Area allows the selection of students able to integrate in their professional assets the idea and the commitment of making the human development more sustainable.
How Do UK B2C High-Tech Start-Ups Utilise Innovation Through Social Media to Improve Business Performance and Outcomes?
Authors: Alsharief Raja Yahya
Published: March 2019

This article describes how social media in the business world today has been one of the major trends that highly affects business transactions worldwide. Existing literature focused on how businesses can leverage social media to better interact with their customers, and how to use of social media by companies to drive innovation. However, not mush had been done to examine how B2C high-tech start-ups utilise innovation through social media to improve business performance. As such, this article attempts to fill a research gap that examines the extent of social media usage by B2C high-tech start-ups in London to drive innovation and hence improve their performance and business outcomes. Due to the complexity of innovation as a concept, qualitative research was chosen as an appropriate method to understand the view of high-tech start-ups on the matter using semi-structured interviews.
The Impact of Social Networks on “Born Globals”
Authors: Huang Qingan , Osabutey Ellis L. C. , Ji Junzhe , Meng Liying
Published: March 2019

This paper aims to explore the role and impact of entrepreneurs' social networks on the internationalisation of “Born Global” firms, in particular, its de-internationalisation process. The research is based on a case study approach and adopts a series of face to face and online qualitative longitudinal interviews. It provides some useful insights into the relationship management of “Born Global” entrepreneurs and unveils some negative impacts of social networks on the initiation of ‘de-internationalisation'. The study reveals the importance of online social networks, high-tech communications and contemporary management techniques for “Born Global” entrepreneurs.
Corporate Social Responsibility and Sustainable Business
Authors: Duca Ioana , Gherghina Rodica
Published: March 2019

In this article, the authors propose an analysis of the corporate social responsibility (CSR) concept together with an emphasis on the role it plays in the context of sustainable development. The article includes a synthesis of the various theoretical approaches to CSR, an overview of the development of CSR practices at a national and an international level, certain authors' for and against arguments are related to generalising these practices, trends regarding CSR practices at international level, as well as an analysis of the CSR practices in Romania. The research conclusions express the author's own points of view on the development of corporate social responsibility initiatives at company level and the related benefits thereof.
Business and Social Media
Authors: Andrews Kate , Mickahail Bethany
Published: March 2019

During the 21st century, businesses benefit from two key components of effective innovation: social media and collaboration. This chapter provides an in-depth analysis to study the interrelatedness of these components. Featured in this chapter are classroom exercises to deepen the learning of students. By providing multiple recent social media examples, the reality of the integral ways in which social media permeates our lives is delivered. Introduced in the chapter is a sixth discipline, an extension of Senge's five disciplines of collaboration. Through the presentation of a new leadership model based upon the six disciplines, the impact of social media is examined. The conclusion of the chapter contains definitions of the concepts introduced. The use of social media has been and still remains a strategically keen tool in business effectiveness.*
Crowdsourcing in Local Public Administration
Authors: Sumra Kalsoom BeBe , Bing Wang
Published: March 2019

Social networks have become very popular online sources of participation in crowdsourcing. This article examines the antecedents of user participation in crowdsourcing and importance of online community involvement in local public administration. Based on data collected from local public administrators and local public through survey, the results produce evidence that importance of online platforms in crowdsourcing can have a consistent impact on services delivery system in local public administration and importance of online open sources have significantly higher level in crowdsourcing on the whole, while importance of social media have significantly lower level overall. The paper contributes with potential implications and recommendations for local public management to achieve effective services delivery in developing countries through crowdsourced work. The present study is the first study that not only shows the effect of online platforms in local public administration, but also analyses the antecedents of crowdsourcing for participation (knowledge sharing, consultation, innovative ideation and reporting).
Impact of General Social Media Experience on Usefulness for Business in the Workplace
Authors: Amoroso Donald L. , Mukahi Tsuneki , Ogawa Mikako
Published: March 2019

This chapter looks at the adoption of general social media applications on usefulness for business, comparing the factors that influence adoption at work between Japan and the United States. In Japan, ease of use and usefulness for collective knowledge in general social media are predictors of usefulness for business social media, and in the United States, only usefulness for collective knowledge is a strong predictor of usefulness for business. The authors did not find behavioral intention to use social media in the workplace to be an important factor in predicting the usefulness of social media for business. The value of this research is its ability to understand the use of social media in the workplace to include how the experience of social media impacts on the expectation of usefulness for business and how the impact of ease of use differs from Japanese to the United States because of cultural, technological, and market reasons.
Smart Tourism Development
Authors: Avdimiotis Spyros , Tilikidou Irene
Published: March 2019

Halkidiki is a district embedded in Central Macedonia, Greece where tourism has been the most significant pillar of development; however, the sharply declining economic performance of the recent years, clearly indicates the need for structural changes and the development of an ambitious long term regional strategy plan, in order to face economic challenges, explore new market opportunities and robust the existing regional competitive advantages. The purpose of the chapter is to introduce smart tourism development model, which is based on three distinctive development tools: 1) Smart Specialization Strategy Methodology, as the pillar to determine and support specific priorities; 2) Quality Policies, as a pillar of stakeholders commitment to provide superior quality products and services, mostly though Local Quality Agreements; and 3) Social economy entrepreneurship, as the third pillar upon which local population and social entities will be engaged and involved. Smart tourism development model aims to establish a new tourism development perception, closely linked to the existing local market opportunities and simultaneously contributing to the enhancement of the competitive advantages of as many as possible of the other sectors of the regional economy.
Business and Technology Trends in Social CRM
Authors: Ayanso Anteneh
Published: March 2019

Social media technologies have transformed the traditional CRM applications landscape in many ways. Apart from extending the traditional customer touch points, social media technologies play a critical role in integrating the activities involved in operational and analytical CRM. This chapter explores the business and technology trends in social CRM and examines current social CRM solutions and their capabilities in the analytical and operational (sales, service, and marketing) efforts of organizations. The chapter also discusses the technological and managerial challenges organizations may face in embracing social media technologies in their customer relationship management processes.
Framing Sustainable Practices
Authors: Gauthier Jeffrey , Meyer Chris , Cohen David
Published: March 2019

This paper develops and clarifies social intrapreneurship theory by examining the “how” of effective intrapreneurial championing. More specifically, the authors consider the following research question: How does the manner in which middle managers frame sustainable practices influence successful championing outcomes? The authors integrate the natural-resource-based view of the firm with research on middle management championing behaviors and issue-contingent models of ethical decision making to propose a model of sustainability championing for social intrapreneurs. To that end, propositions are developed concerning the relationship between the types of sustainable practice championed, how the argument for a given practice is framed, and successful championing outcomes. This paper contributes to a growing body of literature on social intrapreneurship, providing insight into how intrapreneurial championing can be more effective and building a foundation for future research.
Created Shared Value and Sustainable, Inclusive Development of Developing Countries
Authors: Odia James O.
Published: March 2019

The created shared value represents a paradigm shift in business corporate social responsibility (CSR) and sustainability strategy. Apart from addressing the limitations inherent in the traditional CSR which is mainly philanthropic, short-lived and separated from the core business strategy and activities, it enhances the company's competitiveness while simultaneously advancing the economic and social conditions in the community of operation. Companies can create shared values through re-conceiving products and markets, redefining productivity in the value chain and building supportive industry clusters at the company's locations and solving society problems. Despite the criticisms and challenges of the shared value concept, there are convincing evidences that the created shared value is a veritable instrument for addressing the bottom of the pyramid resulting in inclusive, sustainable development of developing countries and it has the potentials to unleash the next wave of global economic growth, prosperity and sustainable development when governments, companies and non-government organizations in developing countries demonstrate commitment to their roles in shared value creation and companies start to think and take long-term views of social investments and economic prosperity, and look at corporate decisions and opportunities through the lens of shared value by incorporating social and societal values into their economic agenda.
Information Technology in Higher Education Management
Authors: Manole Alexandru Lucian , Barbu Cristian-Marian , Rakos Ileana-Sorina , Motofei Catalina
Published: March 2019

Information technology instruments are a very important asset in the hands of every manager. The higher education institutions make no exception from these rules. The exposure to the modern technology and communication tools is very quickly assimilated by students, who acquire the skills to address and even master it and have high expectations from the university they study in to provide them with accurate and real-time information on their particular needs. The management of the university should have at its hand data on students, including personal data, data on academic achievements of any kind, housing in hostels, due and paid tuition fees, data on research, emphasizing both resources allocated and the results obtained, even providing links to online platforms and databases that index these results. The authors approach both operational databases and decision-oriented data warehouses and will aim to capitalize their own research interests in the field of IT to synthesize a set of solutions for this type of software.
Mobile Commerce Adoption
Authors: AlFahl Husam
Published: March 2019

Mobile commerce can be a great potential to generate new streams of revenue for many established and new businesses. The penetration rates for mobile phone subscriptions in many countries show that there are significant opportunities to invest in and introduce mobile commerce services in many of these markets. The aim of this chapter is to explore and identify the various factors that influence the intention to adopt mobile commerce in Saudi banks and telecoms. A number of these factors were included in this research as they are chosen from well-known theories and investigated in the current study within the mobile commerce context using principal component analysis technique. The findings of the research show that seven components can affect the intention to adopt mobile commerce in Saudi banks and telecoms. The three most significant components that can affect the intention to adopt mobile commerce services in Saudi banks and telecoms are performance expectancy, organizational readiness, and mobile commerce features and opportunities.
Using Integrated Performance Indicator Systems in the Digital Economy
Authors: Ifrim Ana Maria , Stanciu Alina , Gherghina Rodica , Duca Ioana
Published: March 2019

The digital era has brought along the exponential growth of the economic and technological opportunities that entities can access and implement in the development of their own activities, along with a series of threats with strategic impact. Being a global, multinational, sustainable, profitable, and credible concept, it also involves a leadership connected to market threats for the entity. Moreover, this leadership must be adaptable, identifying with the vision of the entity and conveying it to its members through the organizational culture it cultivates, but above all a leader who understands and is aware of the functioning of the entity, both managerially and economically. And in order to achieve this, a permanent assessment and re-evaluation of the entity's performance is imperative. This chapter seeks to understand the economic and managerial mechanisms of operation to base the making of pertinent, real, and especially timely decisions in counteracting the threats of a turbulent environment while increasing the potential of the entity.
Sustainable Development and Ecotourism Consciousness
Authors: Pandit Abhijit
Published: March 2019

This chapter focuses on how people of Kallakurichi, Tamil Nadu, India can become conscious of ecotourism, bio-cultural diversity, and sustainable development, vital for both present and future. It utilized a sustainable development framework for considering biological and cultural perspectives. The primary target audience of this research was 100 local people of this lesser known and sparsely populated area, and 31 questionnaires were found to be useful. Simple random sampling was used in this regard. The collected data were analyzed using mean, t-test, Pearson's product moment correlation, and regression analysis. The researcher concluded with findings that point to the need for shared community authority, management, and decision making; mutual benefits; recognition of the rights, values, norms, power structures, and dynamics of local populations; respect for belief systems as well as traditional and local ecological knowledge; and the importance of contextual adaptation.
Pricing for Hill Tourism Destination
Authors: Batabyal Debasish
Published: March 2019

Pricing an alpine tourism is unlike pricing a tangible product. As a part of overall marketing strategy pricing a destination has lot of intricate issues that starts from the basic characteristics of the destination elements to the changing demand aspects. At the time of packaging, an alpine destination by a tour operator or destination promotion organization (DPO), a simplified model, is used that is not essentially limited to an absurd analysis of attraction features through FAM trips a priori. In almost all Indian leisure destinations, tourists are found to be price sensitive and per capita spending is not so high. So, an Indian alpine destination-specific model, based on simple linear regression equation, largely explaining the spending of tourists and thereby implying a modified landscape value has been explained here.
FIBRAs as a Tool for Investment Diversification in the Mexican Hotel Sector
Authors: Vargas-Hernández José G. , González-Altamirano Hugo Daniel
Published: March 2019

This chapter seeks to make an approach to the financial instrument called REIT, Real Estate Investment Trust, specifically in the hotel industry in Mexico. This tool has allowed many investors to make business in the real estate sector, and it has provided a wider range of hosting services. This research takes us into the strategies the REIT leader in the hotel industry has implemented to position themselves as such. In large part this is explained by network theory and agent – principal theory. The study method is based on a literature review of several theories, as well as the study of a successful case. The analysis of results presents and describes the features that have contributed to business success.
Academic Tourism
Authors: Soares Jakson Renner Rodrigues
Published: March 2019

This chapter aims to present the academic tourism segment as a rising trend that can improve indicators, both academic and marketing, of tourist destinations. On the one hand, economistic arguments were presented; on the other, the academic tourist can be highlighted as a source of reliable information about the destination. That is, returning to their place of origin, the individual will share their experience with other people, including students, commenting on their experiences at the university, and of course, on the receiving destination. At this time, both the power of attraction of their listeners to the place will increase and will act as a paradiplomacy. However, both financial aspects (impacts of academic tourism) and marketing (influence on the image of the destination) are strong arguments for betting on this segment, both from the academic literature, as well as destinations with good universities.
Effect of Feed Rate, Tool-Path and Step over on Geometric Accuracy of Freeform Surfaces when 3 Axis CNC Milling
Authors: Van Quy Hoang , Ngoc Tuyen Bui
Published: March 2019

The use of freeform (sculptured) surfaces in the product design process is accelerating at an exponential rate driven by functional as well as esthetics demands. CAD/CAM software is a must in their design are relatively well-covered, issues still remain when it comes to the actual manufacture of freeform surfaces. The major issues are related to the chosen feed rate, toolpaths and step over that would assure the required surface quality, the minimization of the total machining time, etc. This research presents an experimental study to define the effects of machining’s parameters (including: feed rate; toolpath and step over) for CNC 3-axis ball end milling process. The result shows a model for cutting is formulated and incorporated into the parameters of machining that is compatible with all CAD/CAM systems. This result can be used to choose parameters of optimum including federate, toolpath and step over when machining of other freeform surfaces. Keywords: Freeform surface; tool path; ball end milling
Improvement for Microstructure of Severely Deformed JIS S45C Steel after Rolling Process
Authors: Nguyen Vinh Phoi , Nguyen Nhut Phi Long , Dang Thien Ngon
Published: March 2019

A new heat treatment procedure is proposed to remove the strong texture microstructure of JIS type G4051 S45C rolled steel, thus making ease for further machining process and hardening to obtain higher hardness and grain homogeneousness over the common heat treatment procedure. This procedure includes annealing and normalising process and is applied for f14x20 mm samples. By annealing process at approximate 840 to 880°C for 2 to 6 hours, the strong texture has been improved by about 30-40% in comparison to the conventional crystallization process. By normalising process at 880°C and 920°C for 15 minutes, the strong texture has almost treated. The grain size along the rolling direction (RD) and traverse direction (TD) are in the range of 15 to 50 μm.
Optimizating Spray Parameters of High Velocity Oxy Fuel (HVOF) for Cr3C2 - NiCr Coating
Authors: Dinh Văn Chien , Nguyen Thanh Phu , Doan Thanh Hoa , Bui Van Khoa
Published: March 2019

Porosity, hardness, and adhesion mainly affect the performance of thermal spray coating and significantly depend on spray parameters. Therefore, determining value of the spray parameters and their effects on the coating properties are always taken into consideration. This paper studies optimization as well as evaluates influences of HVOF spray parameters which include powder feed rate (M), rotational speed of the details per minute (N) and step movement of the nozzle per revolution (S) to the adhesion, porosity, micro-hardness of Cr3C2 - 20(80Ni20Cr) coating on 40Cr steel shaft substrate. Taguchi experimental design L9 combined with analysis of variance (ANOVA) was used to determine optimum spray parameters and percentage of effect of each spray parameter on properties of the coating. From obtained results, the optimal spray parameters are m = 35 g.min-1, n = 130 rpm, S = 6 mm for the highest hardness coating of 658.2 HV; with m = 45g.min-1, n = 130rpm, S = 3 mm for the smallest porosity of 1.27%; with m = 35g.min-1, n = 130 rpm, S = 3 mm for the coating with a maximum adhesion of 44.07 MPa. The percent effects of the parameters m, n, S to adhesion, porosity and hardness were (2.8%, 33.6%, 63.6%), (0.1%, 1.3%, 98.6%), (32.7%, 43.3%, 24%), respectively. The percent effects of spray parameters on corresponding coating property allows adjustment of spray parameters to obtain the desired coating. Verified experiment results shows that the results are reliable. Taguchi method and ANOVA can find optimal parameters of the HVOF spray to acquire high-performance coating.
Study on Microstructure and Properties of Cu-9Ni-6Sn Alloy Applied for Electric Measurement
Authors: Thang Sai Manh , Tran The Nam , Nguyen Duong Nam
Published: March 2019

High strength elastic alloy has an important role in the manufacture of electrical equipment and machine building. Along with the development of information and telecommunications technology, the application of this alloy in electrical and electronic equipment is very increasingly. Even on boards or connectors of common electrical equipment such as computers, cell phones, these connectors are usually made of high strength elastic copper alloy. The design required features are small, precision built, with high mechanical strength and elasticity, heat resistance, abrasion and corrosion resistance in the operating environment to ensure its/the power and signal stability for a long time. The design trend is reduced in size but still assure the equipment quality is growing significantly and the corporation to manufacture equipment is researched thoroughly. Accordingly, this article presents the research results about the alloy copper with 9%Ni and 6%Sn which has the high elastic strength and elasticity properties of elastomers after heat treatment. The properties of the microstructure, hardness, conductivity, dry friction coefficient, the corrosion resistance of the alloy from which to determine the parameters for the materials selection procedure and the design of the manufacturing of magnetic contact of this alloy. The results of the study show that after heat treatment and deformation, the Cu-9Ni-6Sn has a strength of alloy up to 1200MPa, the elastic limit is 1100MPa and the conductivity is 8.4%IACS, respectively. The values ​​of this characteristic are consistent with the working conditions of the electrical contact. With the deformation process combined with the heat treatment process, the results of our research group created a single-phase homogeneous microstructure that is chemically stable with the spinodal decomposition in appropriate to the treatment of aging process. By modern methods, this paper demonstrates the durability of the alloy due to the spinodal decomposition during aging treatment at 350°C. This structure of spinodal decomposition is about 20-40nm in size, dispersed throughout the entire cross-section of the sample.
A Comparative Investigation of the Porous NiTi Alloys Synthesized by Self-Propagating High-Temperature Synthesis and Combined Process of Decomposition and Sintering
Authors: Nguyen Dang Thuy , Thanh Ho Ky , Dung Tran Van
Published: March 2019

Porous NiTi alloys were successfully synthesized by two different processes, including self-propagating high-temperature synthesis (SHS), and a combined process of decomposition – sintering. A systematic comparison of micro-structures and mechanical properties of these alloys was investigated. The results showed that the SHS process was better than decomposition – sintering process. By controlling the processing parameters of SHS, the received porous NiTi alloys showed that the porosity and pore were larger, and ratio of opened-pore reached up to 80%. The porous NiTi alloys fabricated by SHS process also exhibited good properties, such as a high compressive strength (up to 250MPa), and elastic modulus in range of 6.1 – 7.0GPa. The porous NiTi alloys synthesized by decomposition – sintering process have lower porosity (26-43%), lower compressive strength (< 110MPa), lower elastic modulus (< 1.2GPa) but the strain could be reached to 10%.
Feasibility of Studying Fuel Mixer Design for High Power Engines Using Completely Biogas
Authors: Tran Thanh Phong , Nguyen Quang Minh , Tran Quoc Cuong
Published: March 2019

Nowadays, the original source of mineral fuel for engines was depleting increasingly while combustion products make the environment to be polluted, CO2emission which caused many greenhouse gases; this also makes crude oil prices fluctuate and rise. They tend to use biogas as a fuel for internal combustion engines which have been interested in the powerful countries. Supply of biogas from the waste of farms, flour production, fish processing, landfills, etc., with hundreds or thousands of cube meter of biomass daily leads demand on high-power generators using biogas in order to make good use of produced gas. This article introduces a technology solution for fuel engines using purely large-capacity biogas and operating under compression type fire. Accordingly, the tubular biogas Venturi mixer with electronic controller has been used to supply the mixture of fuel to engine. The CDI-DC ignition circuit provides a high voltage of 28kV for forced combustion of the mixture. Experimental results show that the mixer operates stably, well controlled and allows adjusting the ratio of air/fuel, as well as easily changing its speed when it is used as a hybrid engine for the generator. Some results of performance evaluation of biogas mixer will be presented in this article.
Effects of Starting Materials on Preparation and Properties of Pure SiC Ceramics via the HTPVT Method
Authors: Deng Yu Chen , Zhang Nan Long , Zhang Ya Ming , Wang Bo , Yang Jian Feng
Published: March 2019

The method of high temperature physical vapor transport (HTPVT) is an available approach to prepare silicon carbide (SiC) ceramics with high density and high purity. In the present work, α-SiC (6H-SiC) and β-SiC (3C-SiC) powders were used as starting materials respectively to fabricate SiC ceramics with HTPVT process, and the effects of starting materials on nucleation, density, microstructure and mechanical properties of SiC ceramics were investigated. It showed that at high temperature, the decomposition rate of β-SiC was higher than that of α-SiC, and at the initial nucleation stage, the average grain size of SiC crystal obtained with β-SiC starting materials was smaller than that with α-SiC starting materials, because higher vapour pressure of gas phase which decomposed by β-SiC starting materials facilitated nucleation and growth of SiC grains. Density of the resulted SiC ceramics using α-SiC and β-SiC as starting materials was 3.16 g·cm-3 and 3.17 g·cm-3, indicating close values, while, using β-SiC as the starting materials, the grain size was smaller, consequently, the flexure strength was higher. Increasing growth temperature from 2200°C to 2300°C, the densities and the flexure strength of the SiC ceramics using either α-SiC or β-SiC were decreased.
Experimental Investigation into the Influence of Compression Ratio on Operating Characteristics of Single Cylinder CNG Engine with Port Injection
Authors: Quoc Tran Dang , Tam Tran Thanh , Tuan Le Anh
Published: March 2019

This paper indicates the early experimental results of a Ricardo model CNG engine R&D activity in Vietnam, the experiments were mainly focused on the effects of compression ratio on operating parameters of the tested single cylinder CNG engine particularly designed and fabricated for varying compression ratio purpose. The compression ratio was set in the range of ε = 10 to 15 with the change step of Δε = 1. For each compression ratio, the engine speed were varried from 1000rpm to 2200rpm with the change step of Δn = 200. The early spark angle was also changed to find out the maximum break torque. The limitation of compression ratio and engine speed at each operating point was determined by vibration signal and abnormal sound. The experimental results indicated the early spark angle must be adjusted premature in case of compression ratio and/or engine speed enhenced. Especially, the portion of indispensable power to perform the compression stroke is smaller in comparison with the portion to execute the both strokes of intake and exhaust. In addition, the shape of combustion chamber affected strongly the operating characteristics also found in this study.
Effect of Shapes and Turbulent Inlet Flow to Vortices on Delta Wings
Authors: Tran Ngoc Khanh , Nguyen Van Khang , Nguyen Phu Khanh , Hoang Thi Kim Dung , Dao Van Quang
Published: March 2019

This paper aims to estimate the effect of turbulent inlet flow to vortices on Delta wing with four different turbulence intensity from 0.5% to 15% and the effect of taper ratios to aerodynamic characteristics of Delta wings with four taper ratios: 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7. The main purpose of this paper is to find out the formation, development, and breakdown of vortices on Delta wings when changing taper ratios and turbulence intensity thence determining the center of vortices with the range of attack angles from 5o to 40o in low velocities about 2.5 m/s. This research uses Delta wing models with a 40o swept-back leading edge, the root chord length 150 mm, and a thickness 5 mm. The problem is simulated by using ANSYS fluent and experiment in the subsonic wind tunnel to compare and validate results. The Delta wing models are meshed by using ICEM to improve the mesh quality and using the turbulence model for low Reynolds number flows Transition SST (4 equations) to calculate aerodynamic characteristics such as lift coefficient, drag coefficient, pressure coefficient... find the paths which connect centers of the vortices, and show the contours of pressures and velocities to evaluate the change of centers of the vortices. The results showed that the two vortices grow up and tend to move inward when the attack angle increase, the vortices are broken strongly in high attack angles, the aerodynamic quality of Delta wings change insignificantly when changing turbulent intensity at inlet. This research also carried out that the stall angle increase when increasing the taper ratio.
Research to Evaluate the Quality of Passenger Bus Body Frame, Assuring the Passive Safety in the Design Process
Authors: Nguyen Thanh Cong
Published: March 2019

At present, we are aiming to improve the localization rate and cost reduction in Vietnam, the bus manufacturing units have made their own chassis on the basis of appropriate selection. Passenger bus body frame design is an important process to ensure the suitability and quality of the product before the manufacturing. According to the governmental regulations, the vehicle manufacturing sector in Vietnam must comply with a design approval process and type approval test. Designs must be approved by the competent authority prior to the commencement of manufacturing. There are some applicable regulations in Vietnam such as the standard QCVN 09:2015/BGTVT and QCVN 10:2015/BGTVT on the standards for passenger buses to ensure technical safety and environmental protection. However, there is no specific regulation on the evaluation of bus durability to ensure the passive safety of such vehicles. During the design process, it is possible to calculate the durability accurately that determines the quality of the passenger bus body frame. It could enable automobile manufacturers as well as the competent authorities of design quality approval to control the bus body frame quality, resulting in the improvment of the pruduct, the competitiveness of the product and reducing the production cost. This presentation is the result of structural studies which calculated the deformation of the passenger bus body frame in frontal crash in accordance with the standard ECE R33 and the case of flipping in accordance with the standard ECE R66 for the 46-seat passenger bus, manufactured in Vietnam by Ansys/LS-Dyna software. Accordingly, this evaluation was implemented to assess the quality of the passenger bus body frame in the design process. The result shows that the passenger bus body frame meets the requirement of durability and passive safety in accordance with the calculated standards.
Optimal Selection of Marine Propellers Based on Wageningen B-Series
Authors: Pham Minh Triet , Ngo Khanh Hieu , Le Tat Hien
Published: March 2019

In the scope of this research, we shall examine the feasibility of applying an optimization method to ship propeller selection. The idea is to model the “traditional” selection process as a constrained optimization problem. Throughout this particular paper, an objective function (propeller performance) is optimized, subjects to a number of constraints imposed by cavitation, required propeller thrust, and available engine power. In the beginning, we select Wageningen’s B-series propellers as our study object because of its fidelity in experimental data, and, for the sake of simplicity, we shall use Sequential Quadratic Programming (SQP) method to solve the optimization problem. By introducing this new approach, we want to exploit the power of numerical machine to deal with a computational challenge; selecting a propeller not only best fits the design requirements but also in a most effective manner. Moreover, this method could be further developed, and be applied to the optimization of ship design.
Probabilistic Analysis on the Uncertainty in Natural Frequency of Functionally Graded Material Beams
Authors: Nguyen Van Thuan , Nguyen Duy Liem
Published: March 2019

This paper applies the stochastic finite element method (SFEM) to perform the natural frequency analysis of functionally graded material (FGM). It is assumed that the elastic modulus and width of the FGM beam vary along the thickness and width directions following exponential functions. The stochastic eigenvalue problem is solved independently by first-order perturbation and Monte Carlo simulation (MCS) method through changing elastic modulus as spatial randomness. The results show that the first-order perturbation method based SFEM produces a very close value to MCS method.
Researching on Measurement Strategies of Fuel Tank Corrosion Using Phased Array Technology
Authors: To Thanh Tuan , Dang Thien Ngon
Published: March 2019

Measurement strategies for testing fuel tank corrosion using the ultrasonic Phased Array technology, these have been developed by companies producing ultrasonic measuring instruments, are only applied when performing manual measurement. Therefore, the applying of these measurement strategies for self-propelled robot carrying ultrasonic transducers to automate the testing process have not met the demand. This article presents the results of a study to develop a measurement strategy for testing fuel tank corrosion based on the specification of the self-propelled robot, the ability to build a corrosion map from collected image data by robot. Experimental results show that, with the three proposed measurement strategies using robot, the measurement strategy for moving the robot from bottom to top up will have the shortest testing time, image data are next and data coupling to build a corrosion map is easy. In addition, the process of building a corrosion map can be automatically performed on the computer, making the assessment process more convenient, accurate and faster.
Analyzing Rotor Profile’s Effects to Performance of Roots Vacuum Pump Applied the CFD Method
Authors: Nguyen Thanh Tung , Tuyen Bui Ngoc , Tran Van The
Published: March 2019

The paper is mainly focused on analysis characteristics of lobe pump with three different tooth profiles: Circular, Epi-cycloidal and Circular–Involute–Circular (CIC) rotor profiles. Based on the geometric analysis and mathematical model, the CIC rotor profile combined Circular–Involute–Circular is generated. In this paper, the CFD techniques are used to estimate the effects of tooth profile and lobe number to the pump performance. The simulation results obtained from FLUENT software illustrated that the rotor profile effects remarkably to the pump performance. The outlet pressure of CIC rotor profile is higher than that of the circular and epi-cycloidal rotor profiles. The numerical outcomes also showed that higher rotor’s speed is resulted in higher outlet pressure. Besides, the lobe number of rotor has effect slightly to the pump performance.
Determination of the Expedient Motion Trajectory of the Bucket on the Side Dump Bucket Loader MVC E500-1 during the Digging and Filling Materials
Authors: Ta Van Huy , Chu Van Dat
Published: March 2019

This article presents the method determining the motion trajectory of the bucket on the side dump bucket loader MVC E500-1 during the materials digging by the combinative method. The kinematic equations of the working equipment are established in order to determine the location of the special points on the bucket at different times, from that the necessary space for the machine to safely and effectively operate in the tunnel can be determine. The preliminary obtained results of the present work can be used for reference in the design and application of the Side Dump Bucket Loader MVC E500-1 in tunnel construction by the exploding-drilling method.
A Multiple Objective Model for Vehicle Routing Problem with Time Windows: A Case Study
Authors: Ai Ho Thi Thu , Thi Nguyen Truong , Can Nguyen Van
Published: March 2019

Green transportation has emerged as an efficient way to promote a sustainable supply chain. Transportation activities have significant impact on the whole supply chain at any decision levels. At an operational level, vehicle routing decisions are one of the most critical determinants of the release of transportation emissions. Therefore, this study develops a mathematical model, with an aim to construct routes that simultaneously minimize total cost and total CO2emissions from the transportation activities of a case study located in Can Tho City, Vietnam. A multiple-objective model with the consideration of different vehicle loading capacity, and time windows is then solved using a Weighted Tchebycheff method. Results show that route selection has a positive contribution toward a better balance between economic and environmental objectives.
Study on the Cutting Properties of the Singer Layer Metal Bonded cBN Grinding Wheel by Electroplating in Grinding of Heat-Treated Steel SKD11
Authors: Son Truong Hoanh , Nga Tran Thi Van
Published: March 2019

This article presents preliminary investigations on the cutting ability of the singer layer metal-bonded cBN grinding wheel manufactured by electroplating method at Vietnamese laboratory. The cutting ability of the grinding wheel is evaluated by two factors: grinding ratio G and surface roughness of workpiece. These results are compared to those of the Japanese grinding wheels. The experimental results showed that the fabricated cBN grinding wheel has good cutting ability with high grinding ratio G. The value of the grinding ratio was 600 to 1800 in the grinding process of SKD11 steel (hardness of 62-63HRC) at the grinding speed V of 12.56m/s, feed rate S of 300mm/min, depth of cut t of 0.01mm. The maximum grinding ratio (1800) is equivalent to the average grinding ratio of the Japanese grinding wheel. The grinding ratio is also maintained up to 26 cutting hours. The good grinding surface was achieved with the average Ra of 2.5μm. In addition, the bonding of cBN abrasive to the wheel body was observed with scanning electron microscope (SEM) of the surface of grinding wheel after the cutting process. The SEM image shown that the cBN abrasive particles were not removed from the wheel surface.
Analysis and Fabrication of a Mechanical Quick-Stop for Research on Chip Formation in Hard Turning Process
Authors: Dung Nguyen Thi Quoc
Published: March 2019

Metal cutting is one of the most important machining processes in manufacturing industry. Thorough understanding of metal cutting process facilitates the optimization in selection of cutting tools and machining parameters. There are several methods used for studying phenomena in metal cutting process. Using a quick-top device is an efficient technique for investigation cutting process in which cutting action is stopped so suddenly that the “froze” specimen called the chip root honestly depicts what happened during cutting action. Design strategies of a quick-stop are accelerating cutting tool away from the workpiece or decelerating the workpiece remaining in engagement with the tool. Operation of a quick-stop device can be either mechanically or by explosive. Quick-stop devices can be utilized for various types of machining processes such as: turning, milling, drilling. This paper described the analysis, fabrication, and testing of a quick-stop device which is used for researching on chip formation in hard turning. This device has simple and safe operation which utilizes spring forces to retract the tool from workpiece during cutting. The results of performance at cutting speed of 283 m/min show that the separation distance is quite small, less than 0.2mm so that the deformations on the root chip are close to that while actual machining process. This indicates that the device has satisfied the requirements of an equipment for studying on chip formation.
Burnout in Brazilian Intensive Care Units: A Comparison of Nurses and Nurse Technicians
Authors: Filho Francino Azevedo , Rodrigues Maria Cristina Soares , Cimiotti Jeannie P.
Published: March 2019

Job-related burnout has been reported by intensive care nurses worldwide; this study was performed to examine burnout in intensive care unit bedside nurses and nurse technicians in Brazil. A cross-sectional survey that included the Practice Environment Scale and the Maslach Burnout Inventory was completed by 209 nurses and nurse technicians working in 4 Brazilian intensive care units in 3 teaching hospitals. Compared with nurse technicians, nurses reported higher levels of emotional exhaustion and depersonalization, and a lower level of personal accomplishment. A 1-unit increase in the quality of nurse practice environment was associated with a decrease in high levels of emotional exhaustion and low levels of personal accomplishment. Each additional patient added to a nurse’s workload was associated with an increase in high emotional exhaustion and low personal accomplishment. Approximately one-third of Brazilian nurses working in intensive care units report job-related burnout; the practice environment and staffing appear to be contributing factors.
Acute dyspnea in Emergency Department: point of care ultrasound in the diagnosis of atrial sarcoma
Authors: Arnone Maria Immacolata , Foccillo Giampiero , De Pisapia Federica , De Stefano Giuliano , Albano Giovanni , Carlino Maria Viviana , Sforza Alfonso , Ruggiero Enrico Giuseppe , Mancusi Costantino
Published: March 2019

We describe a rare case of a 65-year-old patient presented to Emergency Department for acute dyspnea. Traditional diagnostic work-up was done and the emergency physician promptly performed a bedside point-of-care ultrasound. A giant mass in the left atrium was detected with impairing of mitral valve function. The patient was then sent to cardiac surgery department with a final diagnosis of high-grade cardiac sarcoma.
Editorial
Authors: Vescovo Giorgio
Published: March 2019

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