bluuebunny/crossref_metadata_2025 huggingface dataset:
Hot compression deformation of an Mg–2.54Nd–0.26Zn–0.32Zr alloy
Authors: Liu H. H. , Ning Z. L. , Cao F. Y. , Du J. F. , Sun J. F.
Published: June 2013

The hot compression deformation of an Mg–2.54Nd–0.26Zn–0.32Zr cast alloy was investigated in the 25–400°C temperature range at initial strain rates from 10−4 s−1 to 10−2 s−1. It was found that strain rate has little effect on true stress when the material was compressed below 250°C. Above this temperature, high strain rates resulted in an increased true stress. The average strain rate sensitivity exponent at higher temperature (300–400°C) was determined to be 0.24 and the calculated activation energy was 185 kJ · mol−1, which is higher than that of lattice self diffusion of pure Mg. The constitutive equation was established and the Zener-Hollomon parameter was calculated as a function of peak stress. The microstructure of a sample tested at 300°C was analyzed by optical microscopy.
Dust and Shadows … A Progress Report
Authors: Russell Patrick
Published: June 2013

This article considers postwar British documentary films in light of recent curatorial initiatives and wider historiographical issues. The article places the BFI's 2010 Shadows of Progress project in the context of a wider and substantial shift of perception of non-fiction film in the early twenty-first century, which has caused the canon of British documentaries to increase in size, scope and profile. The article argues that archivists, media producers and the general public have played at least as large a role in these developments as scholars of the documentary film. The article summarises some of the key features of postwar British documentary as it is now understood and mentions other aspects of postwar, and other, British factual film meriting future research.
Mantis : Le vrai sens
Authors: Casevitz Michel
Published: June 2013

Le rapport sémantique sempiternelle- ment répété entre mantis, «le devin» et mania, «la folie» semble fonder l'étymologie traditionnelle de mantis. Or l'examen des premiers emplois dans les textes grecs de mantis et des dérivés amène nécessairement à mettre en doute ce rapport : le mantis est un homme de savoir, d'expérience, dont la technique révèle ce qui est caché, dans le temps comme dans l'espace. Ce qui amène à proposer une étymologie mettant en rapport mantis et mênuô «dénoncer».
La particule modale Ka dans la littérature dorienne
Authors: Molinos Tejada M. Teresa
Published: June 2013

La forme de la particule modale (κε[ν], ἄν, κα) constitue un critère important pour la classification des dialectes grecs. La particule dorienne ka présente la particularité d'être abondamment représentée dans la prose épigraphique mais absente à la fois des carmina epigraphica et des textes littéraires transmis par les papyri et par les manuscrits. L'auteur propose plusieurs explications de cette double absence.
Libations et sacrifices dans la tragédie grecque
Authors: Jouanna Jacques
Published: June 2013

Ce bref essai sur les rites de la libation et du sacrifice dans la tragédie grecque montre d'abord par une comparaison entre Homère et la tragédie la continuité dans le rite malgré quelques innovations. Il insiste surtout sur les ressources nouvelles que les auteurs tragiques ont su trouver par rapport à Homère dans ces rites en les utilisant, dans les conditions particulières de la représentation, à des fins dramaturgiques dans le cas des libations et des sacrifices, à des fins spectaculaires dans le cas des libations, et à des fins tragiques dans le cas des sacrifices.
L'imputabilité des services d'immigration – Comparaison des crises en Norvège, au Danemark et en Allemagne
Authors: Reichersdorfer Johannes , Christensen Tom , Vrangbæk Karsten
Published: June 2013

L’imputabilité peut être comparée à des mécanismes institutionnalisés obligeant les acteurs à justifier leur action auprès de différentes instances, habilitées à poser des questions et à imposer des sanctions. Dans le présent article, nous analysons différentes « crises » survenues dans les politiques d’immigration en Norvège, au Danemark et en Allemagne dans le cadre d’un cadre descriptif portant sur cinq types d’imputabilité : l’imputabilité politique, administrative, légale, professionnelle et sociale. Les échanges d’information, les débats et les conséquences entre un acteur et une instance sont des éléments déterminants pour comprendre comment l’action politique-administrative est mise en œuvre dans les situations critiques. Premièrement, la dynamique de l’imputabilité met en avant les normes et les valeurs conventionnelles en ce qui concerne la modification des politiques et, deuxièmement, la responsabilité politique formelle ne se traduit pas toujours par des conséquences politiques telles que des démissions de ministres en cas de comportement inapproprié. Les conséquences sont en grande partie déterminées par la façon dont la dynamique de l’imputabilité intervient. Remarques à l’intention des praticiens Les responsables politiques et administratifs, de même que les agents de l’État sont confrontés à plusieurs exigences de la part du grand public et de leurs pairs internes ou externes. Il existe un lien entre les acteurs et les instances, qui est important pour comprendre la façon dont l’administration publique fonctionne. On peut qualifier ce lien de « dynamique de l’imputabilité ». En cas de crise, cette dynamique peut annuler ou maintenir les pratiques et les procédures administratives quotidiennes. Notre cadre d’imputabilité propose un mécanisme systématique permettant d’identifier cinq relations d’imputabilité devant être prises en considération lors des processus de réorganisation ou des initiatives de révision des politiques.
Rewriting Classical Myths: Women's Voices in “Los motivos de Circe” and “Penélope” by Lourdes Ortiz
Authors: Morgado Nuria
Published: June 2013

The purpose of this article is to explore the mythical representations in two of the six short stories that make up Lourdes Ortiz's Voces de mujer (2007), previously published under the title Los motivos de Circe. It is well known that most rewritings of the classical myths have been faithful to the “official truth” of the original versions. But recent works in search of other meanings, have explored dimensions often hidden or blurred by the “official” version. This is the case of the short stories in this collection whose protagonists are six archetypal or mythical women and their respectful references to the biblical, Homeric and pictorial world: Eve, Circe, Penelope, Betsabé, Salomé and Gioconda. The perspective offered by Lourdes Ortiz about the history of these myths allows us to read the story from the point of view of her female heroines. As such, then, in this article I will focus on two female characters from the Homeric epic: Circe and Penelope.
Measurement Uncertainty in Decision-Making
Authors: De Capua Claudio , Morello Rosario , Carbone Rosario
Published: June 2013

In this paper, the authors examine a common issue concerning the influence of measurement uncertainty on decisions. In fact, in some practical applications, it can be necessary to put in comparison measurement data with thresholds and limits. It occurs when the conformity with fixed specifications has to be verified or if warning and alert levels have to be not exceeded. In such a circumstance, to take reliable decisions in presence of uncertainty is a concrete problem. Measurement uncertainty may reasonably be the cause of unreliable decisions. In order to manage properly the uncertainty effect, the authors have developed a decision making procedure based on a methodical approach to measurement uncertainty. In detail, a fuzzy logic algorithm estimates the probability to take a wrong decision because of the uncertainty. Such information is so used in order to optimize the decisional criteria, improving the consistency of the final computing results. Risks and costs associated to the possibility to take a mistaken decision are minimized. Consequently the algorithm singles out the most reliable decision.
AC Magnetic Measurements on Superconductors
Authors: Laurent Philippe , Fagnard Jean-François , Vanderbemden Philippe
Published: June 2013

This work describes the design and realisation of an apparatus to measure simultaneously the AC magnetic properties and the temperature distribution on the top surface of bulk superconducting samples (up to 32 mm in diameter) in cryogenic conditions (temperature range 78-120 K). First the authors describe the experimental set-up used for simultaneous thermal and magnetic characterization of the sample. Next, the authors describe the practical considerations required for generating the large AC magnetic fields, possibly in the presence of DC fields. Then the authors present the data acquisition system allowing both temperature and magnetic data to be recorded at high a sampling rate.” The performances and limitations of the system are discussed.
An Architectural and Evaluative Review of Implicit and Explicit SIP Overload Handling
Authors: Happenhofer Marco , Fabini Joachim , Egger Christoph , Hirschbichler Michael
Published: June 2013

Last year’s trend to migrate circuit-switched voice networks to packet switched Internet Protocol (IP) based networks has favored wide deployment of Session Initiation Protocol (SIP) based systems and networks. As a reaction to large-scale SIP deployment experiences in the field and the need to implement high availability and reliability within these new networks, the focus of SIP extension standardization has shifted from adding new SIP signaling functionality to operational and maintenance aspects, a particular importance being attributed to overload control. Overload denotes a situation in which the traffic injected into a system exceeds the system’s designed capacity. The authors present a detailed categorization of overload architectures and outline main reasons why SIP-based networks are at high risk to collapse when operating at overload. Using measurements in a real SIP infrastructure this paper compares the performance of two overload protection schemes, namely implicit and explicit overload protection, against the performance of non-protected systems. The measurement results recommend overload protection as a mandatory component of commercial SIP deployments to safeguard operation and prevent system collapse in case of overload.
Analysis of the Outsourcing Models and Recommendation
Authors: Dubey Benu Sagar , K Gopakumar , Singh Mukesh
Published: June 2013

This chapter presents the trends in IT services, outsourcing, and vendor management in Indian IT industry. It includes a study of IT services, vendor management, and business model of Outworks Solution India Private Limited, NOIDA. Major findings are in the field of Cloud Computing, mobile applications, and digital illustrations. Digital illustration can be the next big thing that replaces the traditional study thorough books to digitally created cartoons and creatures for the kids. Mobile has become a necessity of life; in such an environment, mobile applications are in high demand. Each organization launches their mobile applications, WAP, so that they can reach to the greater audience in this competitive atmosphere. Cloud Computing proved a boon for SMEs in India because of value for money solutions. Near future in the field of IT is dedicated to Cloud Computing, mobile applications, and digital illustration technologies.
Impact of Managerial Atmosphere on Turnover Intent in the Private Education Institutions of West Bengal
Authors: Chatterjee Soumen , Sarkar Paramita
Published: June 2013

This study topic was taken up to scrutinize the issues that are having a crucial impact on the job satisfaction of the teachers of private colleges in West Bengal. Further, this research tries to throw some light on the overall effect of job satisfaction on the turnover intention of the employees. At the end of the chapter, the authors find that the organizational culture and its reward systems undoubtedly have a positive impact on job satisfaction, in contrast to the workload and role of leadership, which have a negative impact on job satisfaction. However, the study also confirmed that job satisfaction itself has a very strong relation with turnover intention.
Making a Case for Information Integrity in Healthcare
Authors: Khurana Reema , Mandke Vijay V.
Published: June 2013

This chapter presents a medical error example, which revolves around the issue regarding the nature of knowledge factors required in healthcare problem solving. Given the open system view of a healthcare system, the error presented here is of not correctly originating important, but less obvious, information requirements of the case. This leads to the loss of Information Origination Integrity, resulting in delivery of unsafe healthcare.
UML-Driven Software Performance Engineering
Authors: Garousi Vahid , Shahnewaz Shawn , Krishnamurthy Diwakar
Published: June 2013

Performance is critical to the success of every software system. As a sub-area of software engineering, Software Performance Engineering (SPE) is a systematic and quantitative discipline to construct software systems that meet performance objectives. A family of SPE approaches that has become popular in the last decade is SPE based on models developed using the Unified Modeling Language (UML), referred to as UML-Driven Software Performance Engineering (UML-SPE). This particular research area has emerged and grown since late 1990s when the UML was proposed. More than 100 papers have been published so far in this area. As this research area matures and the number of related papers increases, it is important to systematically summarize and categorize the current state-of-the-art and to provide an overview of the trends in this specialized field. The authors systematically map the body of knowledge related to UML-SPE through a Systematic Mapping (SM) study. As part of this study, they pose two sets of research questions, define selection and exclusion criteria, and systematically develop and refine a systematic map (classification schema). In addition, the authors conduct bibliometric, demographic, and trend analysis of the included papers. The study pool includes a set of 90 papers (from 114 identified papers) published in the area of UML-SPE between 1998 and 2011. The authors derive the trends in terms of types of papers, types of SPE activities, and types of evaluations. They also report the demographics and bibliometrics trends in this domain and discuss the emerging trends in UML-SPE and the implications for researchers and practitioners in this area.
EXTREME
Authors: Roubtsova Ella
Published: June 2013

Requirements engineering is a process of constantly changing worlds of intentions, goals, and system models. Conventional semantics for goal specifications is synchronous. Semantics of conventional system modeling techniques is asynchronous. This semantic mismatch complicates requirements engineering. In this chapter, we propose a new method EXTREME that exploits similarities in semantics of goal specification and executable protocol models. In contrast with other executable modelling techniques, the semantics of protocol modelling is based on a data extended form of synchronous CSP-parallel composition. This synchronous composition provides advantages for relating goals and system models, reasoning on models, requirements management, and evolution.
Architecture of Cognitive Radio Networks
Authors: Banerjee Jyoti Sekhar , Chakraborty Arpita , Karmakar Koushik
Published: June 2013

Today’s wireless networks are characterized by fixed spectrum assignment policy. The spectral scarcity and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum, opportunistically. Cognitive Radio (CR) is that very paradigm for wireless communication, in which either a network or a wireless node reconfigures its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. CR adapts itself to the newer environment on the basis of its intelligent sensing and captures the best available spectrum to meet user communication requirements. When the radio link features are extended to the network layer, the cognitive radios form the cognitive radio network. This book chapter is focused on cognitive radio network, architecture of the CR, and its relevance in the wireless and mobile Ad Hoc networks.
Application of Game Models for Cognitive Radio Networks
Authors: Reddy Yenumula B.
Published: June 2013

Cognitive radio technology addresses the intelligent and adaptive models in wireless devices to obtain the unused spectrum (spectrum holes) without any inconvenience to the licensed users. Stochastic models were developed to detect and allocate the unused spectrum. Game theory models are the recent applications that support the latest future for efficient use of spectrum holes. The chapter discusses different game models and their applications to cognitive radio networks. The game theory models include potential games, cooperative games, and noncooperative games. The applications of game models require the mapping of cognitive components to game models. The application leads to efficient allocation of the unused spectrum to cognitive users. Further, the game models help to reduce the false alarms in detecting the primary user and communicate the cognitive users to track the available channels and obtain the appropriate channel.
China’s Social Market Economy
Authors: Berger Ron , Choi Chong Ju , Herstein Ram
Published: June 2013

In 2011, China continues to be the world’s largest recipient of direct foreign investment—which in 2010 totaled US$105 billion. China is also the world’s second largest economy after the U.S. Once a staunchly Communist state, China now advocates a “social market economy” as its business system. The purpose of this paper is threefold. First, this paper seeks to understand what is meant by a “social market economy”. Second, the paper analyzes the traditional shareholder and stakeholder debate by examining different national economies together with their respective societies in terms of business systems. Third, the paper discusses some implications of the emergence of the Chinese economy and business system in the context of potential contributions to social science research. This paper shows that China’s social market economy has many similarities to the stakeholder business system increasingly advocated in global ethics research and presents the challenges to be faced by China’s social market economy in the future.
Domain-Specific Modeling for a Crop Model Factory
Authors: Barbier Guillaume , Cucchi Véronique , Pinet François , Hill David R. C.
Published: June 2013

In the context of crop model design for industrial purposes, this paper proposes a domain-specific modeling approach to provide a crop model factory for the modelers in agronomy. The authors’ approach proposes to separate the concerns of representing the simulation process (process-based dynamics) and the plant data structure. They propose a refined and stabilized metamodel for the dynamics based on past preliminary work. This paper also explains how the Model-View-Controller design pattern can be applied to DSML environments to produce a more specialist-friendly interface. In addition, the authors propose a metamodeling usage of the Model-View-Controller offering the potential to develop a DSML for DSMLs design.
Improving Performance and Scalability of Fiji National University Campus Information System Using N-Tier Architecture
Authors: Kumar Bimal Aklesh
Published: June 2013

Software architecture is very important in the development of large scale software solution and plays a very active role in achieving business goals. This research is an attempt to utilize the N-Tier software architecture for developing a prototype campus information system for Fiji National University (FNU-CIS), to address the issue of performance and scalability. To assist in the design and implementation of FNU-CIS, an extensive evaluation of campus information systems is carried out to provide the bench mark on the current technology. FNU-CIS software architecture is designed with the implementation using JEE and CORBA. Experiments were carried out to assess the performance and scalability of the newly developed system. Several tests were carried out to measure the response time, throughput and latency of our system in distributed settings, and the results mainly favored FNU-CIS. This research makes a significant contribution to the field of software engineering in today’s world where performance and scalability of IT applications are often equated with better business, the process and techniques used in building such systems is paramount. The ideas presented in this paper can be easily utilized for the development of other large scale systems with similar issues such as performance and scalability to be addressed.
About Improving Collection Efficiency for Industrial Plate-Type Electrostatic Precipitator
Authors: Popa Gabriel Nicolae
Published: June 2013

Plate-type electrostatic precipitators are the largest and most used industrial dusts control, most applications are in the production of electricity (thermoelectric power plants). In many industrial applications, plate-type precipitators have three sections and silicon-controlled rectifier power supplies type. Although, the collection efficiency obtained by these type of precipitators are more than 95%, most of the dust particles with diameter less than 10 μm remain un-collected. To improve the collection efficiency different electrical and/or mechanical options can be used. To improve the collection efficiency of industrial plate-type precipitators, the paper presents two practical options. The first solution would be replacing the power supplies silicon-controlled rectifier - with other special power supplies (intermittent power supplies, high frequency power supplies) depending on the dust resistivity; the second solution would be to add a new section at precipitator an expensive solution, usually the last. The technological and electrical sizes, simulated and measured, are presented for the proposed solutions.
A Multi-Purpose Vision-Equipped-Remotely-Operable Rig for Hydro-Units Monitoring
Authors: Stanciu Ion Rares , Ginga Gheorghita , Muntean Sebastian , Anton Liviu Eugen
Published: June 2013

Hydroelectricity is a viable resource for production today. Being renewable, delivering system services and producing the cheapest electricity possible, these are facts that recommend hydroelectricity today. Oftentimes power plants work together with storage pumping stations. Simulation and multiple-speed experimental testing work together to ensure their efficiency increase when redesigning and/or refurbishing. Very important also is the operating cost reduction. Eliminating cavitation regimes lead to a longer life for the machine. The net result is a reduced maintenance activity therefore cost cuts. Operating these stations remotely, offer the possibility to reduce the operating and maintenance costs. Data acquisition feature helps managers to better schedule the maintenance activity with the net effect of reducing the operation cost. This paper presents a testing platform retrofitted with remote control capability and camera vision to demonstrate the remote control and monitoring. Built in the lab, the experimental facility is a valuable hardware platform allowing the researcher to target different research directions.
Online Checking of Radiation Dose for Computed Tomography Imaging Investigations Performed on the Human Patients
Authors: Cordos Alin
Published: June 2013

This article presents an online checking method to get the accumulated x-ray radiation dose for Computed Tomography imaging investigations performed to the human patients. When the patient arrived to imaging center to request a new investigation the system will generate an online verification based on the CNP. The software application will show a warning message if the radiation doze is exceeded. The software technologies used are based on web services and HL7 Version 2.3.1 standard.
Quality of the Hydroformed Tubular Parts
Authors: Ceclan Vasile Adrian , Balc Nicolae , Grozav Sorin , Bere Paul , Borzan Cristina Stefana
Published: June 2013

In this paper the authors shows hydroforming of tubular parts. Also it presents the technology of the hydroforming of the tubular parts. It is presented some experimental research compared with the prediction of the numerical simulation of this process. There are presented also the mechanical parameters of the material which are used in the field of the deforming process.
Procedures and Techniques Used to Increase the Durability of Weak Masonries with Clay Mortars
Authors: Covatariu Daniel , Budescu Mihai , Ţăranu Nicolae , Lungu Irina , Toma Ionut Ovidiu
Published: June 2013

For the past decades the importance of structural rehabilitation of historical buildings, in order to preserve the cultural heritage, has increased considerably. The weak masonry (made from bricks and bounded with low-strength mortars) were created using mortars which, depending on different external factors, were degraded and there are necessary urgent rehabilitation interventions in order to assure the masonrys durability by protecting the joints with new, compatible and reversible materials and techniques (according to Venice charter requirements). In order to increase the durability characteristics of the weak masonry, the design and application techniques of some particular materials and solutions used will be considered in present paper. The used procedures are based on joints reinforcing using fibre reinforced mortar (fibres made of steel, carbon and glass). The test results have revealed a significant improvement of the structural response and a noticeable increased durability depending on the materials and techniques used.
Innovative Technologies and Logistical Solutions for the Reuse of Demolished Concrete in the Construction of Cement Concrete Pavements
Authors: Muscalu Marius Teodor , Radu Andrei , Taranu Nicolae , Budescu Mihai , Lungu Irina
Published: June 2013

The paper presents the results and conclusions of investigations aiming to encourage the use of recycled materials, namely recycled aggregates (RA) and recycled steel fibers (RSF), in the construction of durable, economic and environmental friendly rigid pavements. To minimize and limit the negative effect of RA on the mechanical properties of cement concrete pavements, the research program considered both, development of technical solutions to improve the performance characteristics of RA particle, and RSF disperse reinforcement of concrete mixtures. Roller compacted concrete (RCC) cylindrical and prismatic test specimens manufactured with natural aggregates (NA) and original/performance improved RA have been subjected to flexure and compressive testes to evaluate the influence and contribution of developed technologies. Finally, guidelines and considerations for the use of RA in RCC and plain cement concrete (PCC) pavements are drawn.
Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications
Authors: Ursache Ştefan , Ciobanu Romeo Cristian , Scarlatache Vlad , Niagu Andrei
Published: June 2013

The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNTs.
The Effect of the Portland and Eco-Cement Stabilization on the Physical and Mechanical Behaviour of the Bahlui Clay
Authors: Aniculaesi Mircea , Stanciu Anghel , Lungu Irina
Published: June 2013

The research program developed by the authors and presented in this paper designate the Bahlui clay Romania fitting the clays with specific behaviour such as the Addis Ababa clay, London clay, Dharwad clay, New Yorkshire clay, Ankara clay and Weald clay. Its behaviour is mainly characterized by high swells and shrinkages at moisture variations. The utilization of the Bahlui clay as good foundation soil or material for compacted soil cushion required the determination of the parameters characterizing its behaviour during moisture variation: swell-shrinkage, compressibility and respectively shear strength. The research experiments to define the physical and mechanical behaviour of the Bahlui clay were performed on both natural and remoulded samples with 2.5÷10% mix from the dry soil mass with Portland with/or eco-cement. The paper presents graphs and tables displaying the Portland/eco-cement stabilization influence on the main physical and mechanical indices characterizing the Bahlui clay behaviour during moisture variations as well as conclusions its usage.
IT Gaining Ground in Learning
Authors: Ermalai Iasmina Leila
Published: June 2013

Continuously emerging forms of eLearning like MOOC (Massive Open Online Courses), PLE (Personal Learning Environment) and the use of Semantic Web standards in learning environments, are consistent proof that IT, the Internet, the World Wide Web, Content Management Systems, audio/video lectures, videoconferences, Semantic Web are here to stay, evolve and furthermore, to take control of the learning process, making from it a flexible, viable, profitable and extensively used solution for delivering knowledge. In this general context, the present paper offers an eLearning state-of-the-art and an overview of the trends and technologies proposed, developed and implemented in a particular eLearning environment, over the last years, as part of a postdoctoral research program. The mentioned environment was the Moodle portal used at the “Politehnica” University of Timisoara, the implemented standards were the hCard and hCalendar microformats and the proposed model was one of collective learning through question answering.
Innovative Biocomposite Derived from Waste Materials with Applications in Electrical Domain
Authors: Aradoaei Sebastian Teodor , Ciobanu Romeo Cristian , Darie Raluca Nicoleta , Mosneagu Mihaela
Published: June 2013

The article highlights the possibility of producing biocomposite material from plastic (e.g. polypropylene) and natural organic materials used as fillers (eggplant flour) which have applications in electrical domain. The right amount of material used as filler is evaluated using mechanical tests and dielectric spectroscopy in order to obtain an optimal structure biodegradable, making it suitable as a viable technical solution to partially replace electrical enclosures or different insulators.
A CT-Scan Compatible Robotic Device for Needle Placement in Medical Applications
Authors: Vaida Calin , Gherman Bogdan , Pislă Doina , Plitea Nicolae
Published: June 2013

Several medical applications require devices capable of placing different substances inside the human body. Due to the nature of the task it is desirable to perform these actions with visual feedback, whereas the most viable solution, especially for deep target points, is computer tomography (CT). The paper presents an innovative device, which can be fitted inside the CT gantry, and has decoupled motions to ensure maximum accuracy during the needle placement. It will be shown that for needle placement tasks 5 degrees of freedom (DOF) are sufficient to achieve the task. The geometric and kinematic model of the robot will be presented. The workspace and precision mapping are computed. Some simulation results will show the robot capabilities as well as its placement in the CT scan environment.
Mean Mutual Information Based Adaptive Modulation and Coding Mechanism for Cooperative Relaying in Wireless Systems
Authors: Varga Mihaly , Badiu Mihai Alin , Bota Vasile
Published: June 2013

We propose a link adaptation algorithm for cooperative transmissions in an OFDMA-based wireless system. The link adaptation method selects the transmission type (cooperative or non-cooperative), the modulation orders and amount and type of redundancy required to ensure a target block error rate at each phase of the cooperative transmission. The above parameter-values are chosen so as to minimize the number of occupied time-frequency radio resources required to transmit the K-bit log data block. The algorithm employs a BLER performance prediction method based on mutual information. The proposed link adaptation algorithm has linear complexity, but still provides a very good performance, as shown by simulation results.
Knowledge Modelling of E-Maintenance in Industrial Robotics
Authors: Chioreanu Adrian , Brad Stelian , Brad Emilia
Published: June 2013

Nowadays providers of maintenance and support related to industrial robotics are facing major challenges. Equipment producers around the world are urged to make significant efforts in order to provide high value added services in addition to their traditional product development and manufacturing business. A focal problem with maintenance as well as support of industrial robotics is the need to manage the ever-increasing information flow and system complexity of production cells that incorporate equipment from different producers. In this context, a novel ontology-based representation model is developed for the sharing and use of maintenance knowledge in the robotic field.
Biogas Production by Anaerobic Digestion of Agricultural Biomass: Factorial Design Analysis
Authors: Cioabla Adrian Eugen , Dumitrel Gabriela Alina , Ionel Ioana
Published: June 2013

In present times, replacing fossil fuels with renewable ones becomes a problem more and more stringent in the existing society. Related with this topic, biogas production, as one of the potential renewable fuels has an increasing role both at regional and global level in relation to the potential it poses for energetic independence, both for developed and in course of development countries. The present article intends to underline the potential usage of agricultural biomass (namely wheat bran and cereal mix) as renewable source of energy for biogas production. Factorial design of experiments was employed to study the effect of two factors (net calorific value and C/N ratio) on total biogas produced after 65 days of anaerobic digestion. Main effects and interaction effects of these factors were analyzed using statistical techniques. A regression model was obtained to predict the total biogas production and it was found to adequately fit the experimental range studied.
Design and Analysis for Three Phase Meshing Gear Motor
Authors: Ding Rui Hua
Published: June 2013

In order to reduce volume of robot actuator, a novel gear meshing motor with three phase poles was presented. The rotors and external gears are connected as one part by which the external gears are driven meshing with fixed internal ring gear to output big torque. The torque is convenient to be controlled for its separated magnetic poles without magnetic coupling. The operation principle and magnetic field characteristics were analyzed and the control method was introduced. The finite element software Ansof.Maxwell is used to simulate and calculate the flux linkage where rotor was at different positions, and the static torque obtained directly through magnetic coenergy method. The simulation results verify that output torque of designed motor can reach 1.9Nm under 4A current.
The Design of Test Bench for Transmission Efficiency of Automobile Driveline
Authors: Zhang De Ping , Mo Yi Min
Published: June 2013

To solve the problem of lacking tools for efficiency testing in the process of automotive driveline optimization, a test bench was developed on the basis of adequate study on the properties of the structure of automobile driveline. Using the test technology to carry out efficiency research of automotive driveline, can not only verify the theoretical analysis, but also find an effective way to improve the efficiency of automotive driveline through the processing of testing data. In the past, most of the research for driveline efficiency is limited to the study of automotive transmission, and it is seldom acceptable to take the entire driveline as the research object to study. Adopting modular structure design, this test bench can not only be used to test the efficiency of entire automobile driveline, but also be used to test the efficiency of single components. Testing results shows that the precision of the test bench has achieved the anticipated goal, and the test bench has the advantages of convenient installation and high automation degree, etc.
Research on 5S Concept Used in Production Line Balance Based on Line Balance Chart Method-S Production Line as an Example
Authors: He Qiong , Liu Yu , Ma Hong Ye
Published: June 2013

5S concept has a great effect on site-improvements, and it has been used to promote productivity, improve the environment of production process, and upgrade the working ability of workers etc. In this paper, 5S concept has been used to balance the production line, and S production line has been shown as an example. In addition, line balance chart and production line utilization rate calculation method have been used to exhibit the effect of 5S site-improvements on production line balance and increasing productivity.
A Study of Run-to-Run Control Efficiency for Quality Improvement
Authors: Wang Chien Chih
Published: June 2013

In a traditional run-to-run control scheme, each run requires starting the controlling model, which results in unnecessary adjustment risks when the process is stable. This study used the statistical quality control technique to calculate the adjustment limit, and proposed the start process controller criterion to prevent over-control. The simulation analysis results of the single-input single-output process showed that when the autoregressive parameter is large, the MSE when using the self-tuning controller in addition to an appropriate adjustment limit is less than that of the EWMA controller with an integrated adjustment limit. When the autoregressive parameter is small, no significant differences of MSE are present, though the EWMA controller with an adjustment limit is advantageous due to easier calculation.
A Reverse Design Method of Geometric Model for Fan's Impeller Based on Geomagic Studio and SolidWorks
Authors: Ning Xiao Bo , Tang Rui Hua , Jiang Quan Sheng
Published: June 2013

t is introduced that the point cloudy data of the fans impeller is analyzed systematically and the one of its blades is preprocessed in Geomagic Studio, its surface fitting with NURBS. The IGS file formed finally in Geomagic Studio is input to SolidWorks to reconstruct original impeller model, which expresses that the combination of CAD and reverse engineer (RE) software has important application value in model design of complex geometry products.
Effects of Wheel Dressing Errors on the Accuracy of CNC Gear Form Grinding
Authors: Zhang Hu , Huang Xiao Diao
Published: June 2013

Gear form grinding is a finish machining method for hard tooth surface with a form wheel. Wheel dressing is an important process in gear form grinding, and affects the precision of the ground gear directly. Based on the envelope theory the mathematical model of the dressed wheel surface was built in the case of wheel dressing errors. Then the real profile of the ground tooth in the transverse plan was solved and its deviations from the designed profile were evaluated. Finally the effects of each dressing error on the precision of the ground gear were analyzed using the proposed mathematical model. The results provided theoretical foundation for the precision control during manufacturing a gear form grinding machine. A grinding experiment was implemented using the gear form grinding machine and the ground gear was measured by a three-coordinate measuring machine. The measure result indicated that the accuracy grade of the ground gear achieved 4 (ISO1328-1: 1997).
Analysis of Influence Parameters of the Project Ribbed Bar Machining Quality
Authors: Zheng Xi Jian , Wang Zhong Nan , Ma Lei
Published: June 2013

This paper presents the method of calculating roller spacing and press amount of straightening roll. based on rigid-flexible virtual prototype technology, the entities model of straightening block was established by Pro/E, then it was imported into the ADAMS environment and constraints were added to create a rigid model, the model neutral file generated by ANSYS, thereby the rigid-flexible coupling virtual prototype was established. The distance of the point in the steel-bar relative to the end in Y direction is obtained through simulation, the acceleration curve and the range of roller spacing and press amount which consist with theory and the straightness of the ribbed bar after being straightened are obtained, which are reference to the dynamic simulation of the same complicated mechanical system and the theory of steel-bar straightening.
Rigid-Body Guidance Synthesis of Four-Bar Linkages with Use of the Relative Displacement Differences of Monad Vectors
Authors: Wang Cheng Zhi
Published: June 2013

This paper innovatively use the relative displacement differences of monad vectors to model equations for synthesizing linkages. Two types of monads are analyzed and the dyads are also presented. Several synthesis examples are illustrated to validate the effective applications of the monads to modeling and solving rigid body guidance synthesis problems. Because the monads have better modularity than the dyads used before, could be directly applied to formulating the synthesizing equations for multi-bar linkages, and then the equations could be directly solved by some corresponding numerical methods, the method is particularly suitable to automatically model and solve the synthesizing problems with computer.
Coupling Simulation and Characteristic Analysis of Pure Water High-Speed On-Off Valve
Authors: Yan Ling Yun , Wu Peng Fei , Bao Zeng Xian
Published: June 2013

The paper introduces the structure and operating principle of two-position three-way pure water high-speed solenoid on-off valve, establishes the mathematical model of on-off valve, obtains performance parameters of electromagnet through Ansoft simulation, imports the performance parameters of electromagnet into the solenoid on-off valve simulation model in AMESim, and realizes the coupling simulation among electromagnetic circuit, mechanical part and hydraulic system, so as to improve simulation precision and achieve relatively correct static-dynamic simulation results of high-speed solenoid on-off valve.
Model of Group Robots Based on Distribution Function
Authors: Itami Teturo
Published: June 2013

We have so far developed continuum mechanical simulation methods of group robots. Taking Hamiltonian with specified exponential function of time has allowed us to deal with motion of robots with friction also in canonical equation framework. We examine in this article results calculated by our continuum mechanical methods. We especially note the presence of collision among robots.
Optimization of Vehicle Powertrain Mounting System Based on Adams/View
Authors: Pan Gong Yu , Yan You , Yang Xin
Published: June 2013

In order to solve the vibration problem of diesel engine powertrain assembly at its idle state, a six degree-of-freedom dynamics model of the powertrain mounting system is established and a optimization based on Adams/View is applied to simulation and analysis on the powertrain mounting system with energy decoupling method. The results show that the optimized repositioning mounts installation position can effectively improve decoupling rate in main vibration directions of mounting system, proving that the energy decoupling method has good effect on greatly improving the system’s vibration isolation efficiency.
Appling the Bessel Filter in State Feedback
Authors: Wang Qi Zhi , Wang Xiao Xia
Published: June 2013

The feedback gain is gotten according to the analysis of Bessel filter .The step response is good and fast, and no excess. Appling to the design of state feedback, it is proved fast and no overshoot. It is a good correct method.
The Simulation and Analysis of Piezoelectric Vibration Control for the Autobody Thin-Wall Structure
Authors: Shen Chuan Liang , An Xiao Wen , Han Ye , Wang Da Xue
Published: June 2013

The finite element method is adopted to simulate the piezoelectric vibration control of the body thin-wall structure. The finite element model of piezoelectric laminated structure which is formed by attaching piezoelectric layer to the autobody thin-wall structure is established. The static analysis and modal analysis is condudted by the piezoelectric analysis of the finite element analysis software. The proportional control method is studied in the piezoelectric active vibration control analysis for the autobody thin-wall structure. The active vibration control effectiveness according to different structural parameters is analyzed and the influence rules of structural parameters are concluded.
Study on the Motions and Stress of Immersing Tunnel Element under Wave Actions
Authors: Shi Hong Da , Li Shui Yu , Wang Dong
Published: June 2013

The dynamic characteristics of large-scale tunnel element are very important for the process of immersion. In the paper, the motions and stress of the element under wave actions were studied. The linear wave diffraction theory and the three-dimensional source distribution method were applied to calculate the wave loads and motion responses of the tunnel element under different incident wave conditions. In the study, there have no cable on the element. On the basis of the above theories, the stress and the motions of the element were studied. The first order wave forces and the second order wave force were deduced, and the motions equation was made.
Dynamic Identification of Industrial Robots from Low-Sampled Data
Authors: Oliva E. , Berselli G. , Pini F.
Published: June 2013

This paper proposes a fast and on-site method for the dynamic identification of industrial robots from low-sampled position and torque data. Owing to the basic architecture of the employed controller, only trapezoidal-velocity trajectories can be enforced for identification purposes. Differently from previous literature, where this kind of trajectories were performed with limited joint velocities and range of motions, the procedure proposed hereafter is characterized by fast movements performed on wide angular ranges. Furthermore, in order to identify the influence of friction without deriving complex friction models, a novel method is outlined that decouples frictional torques from gravitational, centrifugal and inertial ones. Finally, although multiple experiments of different kinds have been performed, inertial parameters are determined in one singular step, thus avoiding possible error increase due to sequential identification algorithms.