bluuebunny/crossref_metadata_2025 huggingface dataset:
Improving Energy Efficiency of the Variable Frequency Drive of the Forced-Draught Fan with the Two-Speed Asynchronous Motor
Authors: Khramshina Ekaterina A. , Karandaev Alexander S. , Khramshin Rifkhat R.
Published: September 2015

Based on the example of forced-draught fans of the GOFHWB-100 series hot water boilers (gas and oil fired hot water boilers) power supply reserves of the electric drive with two-speed asynchronous motor have been determined. The structural chart of the developed control system of the electric drive with winding changeover depending on the boiler performance is provided. The paper considers power consumption of electric drive in the variable frequency speed control mode at the motor operation on the high and low speed windings. It presents methods for calculation of energy performance based on computing the equivalent efficiency of the fluid-handling application. The analysis of the efficiency change has proved that the variable frequency control enables electric power savings at the low speed winding by 5 to 6%. The results obtained are recommended to be widely applied at the change-over of the electric drives with two-speed asynchronous motors to the variable frequency control of performance.
Numerical Modeling of Dynamic Processes of the Reciprocating Reversible Electrical Machine
Authors: Ivshin Igor Vladimirovich , Kopylov Andrey Michailovich , Safin Alfred Robertovich
Published: September 2015

Now rotational electrical machines are used mainly for the implementation a reciprocating motion of working mechanisms and also as the electric generators powered by internal combustion engines. It is achieved by means of the kinematic transfers complicating a design and reducing the drive efficiency. The use of linear reciprocating electric machines allows to eliminate these defects. It should be noted that the most effective ones are the cylindrical designs of reciprocating electric machines with permanent magnets, whose efficiency reaches 93 – 95%. However, the rarity and lack of a mass production of this machine type and special recommendations for their design causes the need of research, directed on search of optimum constructive decisions. The article describes the types of linear electrical machines and summarizes the results of numerical modeling of dynamic characteristics for the three versions of the reciprocating cylindrical machine with permanent magnets of 10 kW with the oscillation frequency of the translator 20 Hz and the length of operating cycle of 120 mm. The most effective design parameters of linear electric machine were determined on the basis of its specific characteristics and analysis of the EMF graphics shape, appearing on the stator windings in the generator mode.
Research of Highly Effective Magnetoelectric Disc Type Synchronous Motor
Authors: Garganeev А.G. , Leonov S.V. , Fedorov D.F.
Published: September 2015

The electrical and magnetic materials development, as well as the electrical machines principles of design, prepared the base for the research and new designs of high-performance disk-type electric machines development for use, for example, as a high-performance valve gearless electric drive part.
Stand-Alone Power Systems with IGBT Inverter
Authors: Markovski Vadim , Kaidar Argyn , Shapkenov Bauyrzhan
Published: September 2015

This article is an overview of research in fault diagnosis, detection, and reconfiguration. The review particularly focuses on power electronic applications and drives. Diagnostics of systems with conventional inverter drives (CID) is considered because knowledge of fault diagnosis in CIDs can be used for application in other inverter drive topologies; therefore, several techniques of fault diagnosis and reconfiguration in CIDs are analyzed.
Analysis of Power Operational Properties Transformers with a Core of Amorphous Materials
Authors: Inahodova Lolita M. , Kazantzev Alexander A. , Shaydullin R. Ereklievich
Published: September 2015

The article states the description of the foreign experience in exploitation of power transformers with a core of amorphous materials and their constructive peculiarities. The technical and economic basis of their use in the distribution lines in the Russian Federation is represented. There are also the results of the substitution of conventional transformers by transformers with a core of amorphous steel.
Induction Traction Motor Mathematical Model to Control Thermal State
Authors: Goldovskaya Anastasia A. , Dorokhina Ekaterina S. , Serov Alexander B.
Published: September 2015

A thermal mathematical model of the induction traction motor was developed. The thermal model calculates the motor node temperatures with minimum number of input parameters. It can be applied as a thermal control condition system of electric traction motors during the operation. The adequacy testing results of the mathematical model in ELCUT were presented. Also, the comparison of mathematical model information and the results of experimental researches were submitted.
Analysing the Impact of Electrical Displacement and Leakage Currents in Transformer Insulation on Voltage Measurement Accuracy
Authors: Lebedev Vladimir , Yablokov Andrey
Published: September 2015

The article examines the methods of calculating capacitive currents in a measuring transformer based on a resistive voltage divider. The developed methods may be used to optimize the design of resistive dividers.
Improving of Energy Measurements Reliability Using Weighted and Normalized Residual Analysis
Authors: Kochneva Elena , Pazderin Andrew , Sukalo Aleksandar
Published: September 2015

The article considers the possibility of a posteriori methods implementation for energy measurements verification. Posteriori methods are developed in the framework of state estimation theory. The new approach to calculate the parameters of electric conditions using electrical energy measurements is discussed. Test scheme with different measurements sets is considered. Results demonstrate the implementation of a posteriori analysis.
Problem of Reliability, Verification of Electrical Power Systems Simulation and Ways of Solving it
Authors: Gusev Alexander , Suvorov Aleksey , Sulaymanov Almaz
Published: September 2015

The analysis of existing problem of reliability and verification of simulation tools of electrical power systems is presented in this article. It is proved, that the solution of this problem is not possible by using simulation tools utilizing numerical methods. Described the concept and tools are based on alternative way of electrical power systems simulation called the hybrid simulation. This way provides an effective solution to the problem of reliability and verification simulation tools of electrical power systems.
Fixing Magnetically Operated Sealed Switches of Current Protections in Closed Electrical Pathways of Electrical Installations at 6-20 kV
Authors: Kletsel Mark , Berguzinov Askhat
Published: September 2015

Three devices are offered for fixing magnetically operated sealed switches at a safe distance from conductor wires. It is demonstrated that they provide current protection without the use of current transformers. It is described how to adjust and calculate the current in the wire where the magnetically operated sealed switch functions.
Electromagnetic Induced Force Study in the Magnetoelectric Generator Winding
Authors: Tatevosyan Aleksandr , Tatevosyan Andrey , Fokina Valeriya
Published: September 2015

The paper considers the study of the electromagnetic force (EMF) of a synchronous generator based on the three-phase induction machine. The stand includes: a frequency converter, an induction motor, a synchronous generator, a three-phase rectifier, an active load resistance, power protection and inclusion industrial electrical network. The study provides an analytical solution to one of the main objectives within theoretical foundations of electrical engineering, formulated so to reflect the decision making while designing new types of synchronous generators with permanent magnets.
Technical Diagnostics of Electric Equipment with the Use of Fuzzy Logic Models
Authors: Manusov Vadim , Ahyoev Javod
Published: September 2015

The possible technical diagnostics method of electrical power systems (EPS) has been considered, in particular, the electric equipment of substations and electric networks by means of using mathematical apparatus of indistinct sets and fuzzy logic theory. It is shown that on the basis of indistinct expert estimates it is possible to do a prediction for possible causes of failures if preliminary estimates of the failures signs available are known.
The Comparison of Methods of Testing Enameled Wire to Mechanical Stress
Authors: Leonov Andrey , Supueva Adelya
Published: September 2015

This work presents the test results of the enameled winding wires, characterizing an insulation mechanical strength. The standard and original test methods were used. It should be noted that the existing standard test methods do not estimate enamel insulation resistance to the mechanical loads authentically. Note that the estimation of wire mechanical resistance can be done by the determination of the number of defects in the enamel insulation. The results of tests for wires with various types of insulation are presented.
Combined Cycle Gas Turbine (CCGT) with Freon Steam Turbine
Authors: Kuryanov Anton , Mõik Ivo , Grigoryeva Oksana
Published: September 2015

The article considers the prospect of a combined-cycle plant with freon as the working fluid of the steam turbine. Methodical approach to the study of such plants is expounded. For the option, CCGT with gas turbine M701G2 and use of freon R134a results of calculations of technical and economic efficiency, gas-dynamic characteristics, design-layout parameters are shown. The effectiveness of investments has been assessed.
Results of Mathematical Modeling to Study the Influence of Accounting the Process Moisture on Energy Indicators of Cogeneration Steam Turbines
Authors: Tatarinova Natalia , Suvorov Dmitry
Published: September 2015

The article proposes and being tested a methodology that allows using the mathematical model developed to clarify the possible impact of a precise process moisture measurement on the performance of energy efficiency of the cogeneration turbines.
Power Plants Process Control Improvement in Emergency
Authors: Mikhaylenko Anna , Shchinnikov Pavel
Published: September 2015

The paper shows the relevance of the research process protections of power units that reduce or prevent economic damage caused by the accident. For this data, the design methodology for coal-fired units with drum boilers, which allow to define the work on stored energy boiler auxiliary load. The proposed technique reduces the cost of implementing the considered technological protections.
The Analysis of an Air Condenser’s Performance in Russia's High Northern Climate
Authors: Rylskiy Aleksey , Borush Olesya , Pettersson Gustav
Published: September 2015

This paper briefly describes the main issues that are happening due to the usage of traditional systems of technical water supply at power plants, both from operational and environmental points of view. The article also presents an alternative option, as an air condenser, and the analysis of the using of such technology.
Energy Service Contracts: Russian Practices
Authors: Shablova Elena , Gorodnova Natalia , Berezin Andrey
Published: September 2015

The article investigates the problem of legislation in the field of energy conservation and provides an assessment of several of new legislation acts and development prospects. The authors analyze the Russian practice of energy service contracts, problems of contracts' content, as well as a subject of contracts. The authors investigate the possibility of adaptation of contractual structures, such as performance-contract that is used in an international energy services practice.
Impact Analysis of Excessive Fuel Consumption on Technical and Economic Performance of Coal-Fired Co-Generation Units
Authors: Dvortsevoy Alexander , Tikhonov Ilya
Published: September 2015

The study sets the objective of overall overrun fuel separation into two components. The first one depends on changes in the electric load of the power unit. The second component is influenced by changes of the power unit controlled parameters. The separation leads to the adjustment of technical and economic performance of the power plant unit. These indicators show both the efficiency of the power unit and the overall plant.
Permanent Magnet Heater for Special Applications
Authors: Forzan Michele , Dughiero Fabrizio
Published: September 2015

This paper presents a review of the research activities carried out at the Laboratory for Electroheat of Padova University (LEP) in the field of high efficiency through heating of aluminum workpieces. Induction heating obtained by rotating a billet in a DC magnetic field produced by superconductive coils was the first attempt to reach high electrical efficiency in mass heating of high conductive metals, like aluminum, copper and brass. More recently, the same concept has been applied by rotating rare earth permanent magnets around a metal billet kept in a fixed position. This technology appears much more promising because of lower cost of installation and a more robust mechanical design.
Turn-to-Turn Short Circuit Diagnostic Improvement Method Based on ANN for Synchronous Generator Excitation Winding
Authors: Polishchuk V.I. , Kuleshova E.O. , Vasilyeva Yu.Z
Published: September 2015

The paper describes the determination method of quasi-reactive power for synchronous generator turn-to-turn short circuit diagnostics. A proposed method allows to determine the relation between the exciting current and quasi-reactive power at the generator leading to a high probability. This relation is the basis of the determination method of turn-to-turn short circuit availability and its severity.
Ways of Decreasing Fuel Consumption in Vehicles
Authors: Biryukov V.V. , Kalugin M.V. , Nevolina A.O.
Published: September 2015

Everyday the mankind consumes more and more energy, in this regard the stocks of traditional sources of this energy are decreased. Much attention has always been given to the problem of effective energy saving in transport. The environmental degradation is in parallel to the problem. The hybrid vehicle invention can be the solution of the problems given. The research considers the development and invention of the energy saving hybrid vehicle. The vehicle is driven by means of power station, the differential peculiarity of which is two energy sources usage and two types of engine, electric-powered and heat engine. In this paper the arrangements of combined and hybrid power stations for vehicles with heat-engines are developed. The key advantage of such vehicles is a fuel consumption reduction and the emission of harmful agents to the atmosphere.
Mechanical Oscillations Simulation of an Adaptive Flexible Mirror
Authors: Kanev Feodor , Makenova Nailia , Nesterov Roman
Published: September 2015

The whole model of adaptive optics system of energy and information transfer should include a model of an active element [1] construction of which is defined by parameters of the system and beam control algorithm. In the algorithm of full-field phase conjugation a nonlinear crystal or two flexible mirrors with a layer of free space between them are usually employed [2, 3], while a system of phase conjugation requires a flexible mirror as an active element [4]. In the paper the model of a flexible mirror is considered which takes into account dynamic oscillation of reflecting surface.
Improved Cleaning of the Engine Cylinder from the Exhaust Gas Using the Active Ejection in the Exhaust Tract
Authors: Plotnikov Leonid , Zhilkin Boris , Brodov Yuriy
Published: September 2015

The results of experimental study of the exhaust process of the piston internal combustion engine are presented in the article. A method for improving the cleaning of the cylinder from the exhaust gas on the basis of the effect the ejection is proposed in the paper. Dependences of change of the instantaneous gas velocity on the angle of rotation of the crankshaft in the exhaust tract of a different configuration (with ejector and without it) are listed in the article.
Iterative Approach in Design and Development of Vertical Axis Wind Turbines
Authors: Solomin Evgeny , Kirpichnikova Irina , Martyanov Andrey
Published: September 2015

Universal step-by-step method of design and development of multi-tier H-Darrieus Vertical-Axis Wind Turbine is described. The method is based on the systemic scientific approach of component-wise optimizing of the Turbine including the design of air foils, rotor outline configuration, alternator calculation and the development of power takeoff algorithm.
Optical Recording of Bubble Dissolution of Diagnostic Gases in Electrical Insulating Liquids
Authors: Ridel Aleksander , Bychkov Alexander
Published: September 2015

The diffusion coefficients of the basic diagnostic gases were determined by optical recording of the bubble dissolving dynamics in degassed insulating liquid. It is necessary to understand the diffusion of diagnostic gases in insulating liquids for obtaining high-quality diagnostic conclusions obtained during the analysis of high voltage electrical equipment with paper-oil insulation using gas methods.
Increase Adjustment Capacity Generators for Power Supply Systems with Distributed Generation
Authors: Udalov Sergey , Achitaev Andrey , Yumanov Michael
Published: September 2015

Modern development of distributed sources of electricity in Russia is impossible without the development of means to improve its dynamic stability during sudden changes of regime. In this paper a solution of using a pseudo-direct drive is proposed. The relevance of the study is related to the fact that Russia distributed energy sources in isolated power systems have little power. Unfortunately, there are some drawbacks of such power systems in terms of electricity problems associated with the loss of dynamic stability during short circuits.
Electromagnetic Motor with an Active Teeth-Slot Zone for Vibration Technologies
Authors: Rogova Olga
Published: September 2015

The paper describes finding magnetic system rational geometrical ratios for a linear cylinder electromagnetic motor with the active teeth-slot zone. Rational ratios were found with finite-elements simulation and analytical derivations with respect to motor efficiency. The rational geometrical ratios ranges have been found for the inductor active volume. The investigation results can be widely used in design of electromagnetic motors with various teeth-slot zone configurations.
Developing a Highly Reliable Asynchronous Motor Development with an Asymmetric Magnetic Core for Special Operating Conditions
Authors: Bakubaev Baurzhan , Denisenko Viktor , Nedzelskiy Vladimir
Published: September 2015

The paper presents the design peculiarities of the asynchronous motor with an asymmetric magnetic core having ceramic insulation, the motor being designed for the application under severe radiation conditions.
Paratesticular Spindle Cell Rhabdomyosarcoma
Authors: Dey Biswajit , Bharti Jyotsna Naresh , Dange Prasad , Desai Parth Anil , Khurana Nita , Chander Jagdish
Published: September 2015

Spindle cell rhabdomyosarcoma is a rare variant of embryonal rhabdomyosarcoma that affects young males and most commonly involves the paratesticular region. We report a case of paratesticular spindle cell rhabdomyosarcoma in a 14-year-old boy, who presented with a painless scrotal mass. Left inguinal orchidectomy was performed. Histopathological and immunohistochemical examination of the mass revealed spindle cell rhabdomyosarcoma of the paratesticular region.
Locally Advanced Spiroadenocarcinoma in the Regional Axilla of a Breast Cancer Patient: Hallmarks of Definitive Diagnosis and Management
Authors: Gingrich Alicia A. , Fung Maxwell A. , Konia Thomas , Canter Robert J.
Published: September 2015

Eccrine spiroadenocarcinoma is an extremely rare malignant eccrine gland tumor which may masquerade as other more common malignancies such as poorly differentiated squamous carcinoma or metastatic breast cancer. We report a case of an ulcerated axillary skin lesion with bulky adenopathy in a 77 year-old female with a prior history of ipsilateral triple negative breast carcinoma. The clear transition of benign spiradenoma to malignant carcinoma was essential to establishing a definitive diagnosis and treatment plan.
Genomic, Proteomic, and Metabolomic Data Integration Strategies
Authors: Wanichthanarak Kwanjeera , Fahrmann Johannes F. , Grapov Dmitry
Published: September 2015

Robust interpretation of experimental results measuring discreet biological domains remains a significant challenge in the face of complex biochemical regulation processes such as organismal versus tissue versus cellular metabolism, epigenetics, and protein post-translational modification. Integration of analyses carried out across multiple measurement or omic platforms is an emerging approach to help address these challenges. This review focuses on select methods and tools for the integration of metabolomic with genomic and proteomic data using a variety of approaches including biochemical pathway-, ontology-, network-, and empirical-correlation-based methods.
Pricing Model for Convertible Bonds: A Mixed Fractional Brownian Motion with Jumps
Authors: Miao Jie , Yang Xu
Published: September 2015

A mathematical model to price convertible bonds involving mixed fractional Brownian motion with jumps is presented. We obtain a general pricing formula using the risk neutral pricing principle and quasi-conditional expectation. The sensitivity of the price to changing various parameters is discussed. Theoretical prices from our jump mixed fractional Brownian motion model are compared with the prices predicted by traditional models. An empirical study shows that our new model is more acceptable.
Digital Forensic Investigation Models, an Evolution study
Authors: Mushtaque Khuram , Ahsan Kamran , Umer Ahmer
Published: September 2015

In business today, one of the most important segments that enable any business to get competitive advantage over others is appropriate, effective adaptation of Information Technology into business and then managing and governing it on their will. To govern IT organizations need to identify value of acquiring services of forensic firms to compete cyber criminals. Digital forensic firms follow different mechanisms to perform investigation. Time by time forensic firms are facilitated with different models for investigation containing phases for different purposes of the entire process. Along with forensic firms, enterprises also need to build a secure and supportive platform to make successful investigation process possible. We have underlined different elements of organizations in Pakistan; need to be addressed to provide support to forensic firms.
A Strategic Analysis of Information Sharing Among Cyber Attackers
Authors: Hausken Kjell
Published: September 2015

We build a game theory model where the market design is such that one firm invests in security to defend against cyber attacks by two hackers. The firm has an asset, which is allocated between the three market participants dependent on their contest success. Each hacker chooses an optimal attack, and they share information with each other about the firm’s vulnerabilities. Each hacker prefers to receive information, but delivering information gives competitive advantage to the other hacker. We find that each hacker’s attack and information sharing are strategic complements while one hacker’s attack and the other hacker’s information sharing are strategic substitutes. As the firm’s unit defense cost increases, the attack is inverse U-shaped and reaches zero, while the firm’s defense and profit decrease, and the hackers’ information sharing and profit increase. The firm’s profit increases in the hackers’ unit cost of attack, while the hackers’ information sharing and profit decrease. Our analysis also reveals the interesting result that the cumulative attack level of the hackers is not affected by the effectiveness of information sharing between them and moreover, is also unaffected by the intensity of joint information sharing. We also find that as the effectiveness of information sharing between hackers increases relative to the investment in attack, the firm’s investment in cyber security defense and profit are constant, the hackers’ investments in attacks decrease, and information sharing levels and hacker profits increase. In contrast, as the intensity of joint information sharing increases, while the firm’s investment in cyber security defense and profit remain constant, the hackers’ investments in attacks increase, and the hackers’ information sharing levels and profits decrease. Increasing the firm’s asset causes all the variables to increase linearly, except information sharing which is constant. We extend our analysis to endogenize the firm’s asset and this analysis largely confirms the preceding analysis with a fixed asset. We use the software Mathematica 10.1 (www.wolfram.com) to program the model mathematically with equilibrium constraints, and perform numerical analysis illustrated graphically.
Assimilation Patterns in the Use of Advanced Manufacturing Technologies in SMEs: Exploring their Effects on Product Innovation Performance
Authors: Uwizeyemungu Sylvestre , Poba-Nzaou Placide , St-Pierre Josée
Published: September 2015

Manufacturing small and medium-sized enterprises (SMEs) are more and more adopting advanced manufacturing technologies (AMT) aimed at fostering product innovation process, improving product quality, streamlining the production process, and gaining productivity. In this study, we analyze the relationship between AMT proficiency levels in manufacturing SMEs and product innovation performance. Using data from 616 manufacturing SMEs, and considering a wide range of various AMT (20 different types of AMT grouped into 5 categories), we derived three AMT assimilation patterns through a cluster analysis procedure combining hierarchical and non-hierarchical clustering algorithms. The analysis of the relationship between AMT assimilation patterns and product innovation performance shows a rather unexpected picture: in spite of the existence of clearly distinct patterns of AMT assimilation, we find no significant relationship between any pattern and product innovation performance. Instead, we find the organizational and environmental context of SMEs to be more determinant for product innovation performance than any of the AMT assimilation patterns. From a practical point of view, this study indicates that manufacturing SMEs managers interested in fostering their innovation capabilities through AMT assimilation need to be aware of the contingency effects of their organizational size, age, and sector of activity.
Adoption of information security measures in public research institutes
Authors: Albuquerque Junior Antonio Eduardo de , Santos Ernani Marques dos
Published: September 2015

There are several Information Security measures recommended by international standards and literature, but the adoption by the organizations should be buoyed by specific needs identified by Information Security Governance structure of each organization, although it may be influenced by forces of the institutional environment in which organizations are inserted. In public research institutes, measures may be adopted as a result of pressure from Government and other organizations that regulate their activities, or by the influence of Information Security professionals, or simply adopting the same measures of leading organizations in the organizational field. This study aimed to investigate whether in public research institutes the adoption of Information Security measures is influenced by organizational factors relating to the Information Security Governance, and by external factors relating to its institutional environment. The results show that these organizations are subject to institutional influences more than organizational influences.
Use of virtual learning environments: A theoretical model using decomposed expectancy disconfirmation theory
Authors: Pereira Fernando Antonio de Melo , Ramos Anatália Saraiva Martins , Andrade Adrianne Paula Vieira de , Oliveira Bruna Miyuki Kasuya de
Published: September 2015

The present study aims to investigate the determinants of satisfaction and the resulting continuance intention use in e-learning context. The constructs of decomposed expectancy disconfirmation theory (DEDT) are evaluated from the perspective of users of a virtual learning environment (VLE) in relation to expectations and perceived performance. An online survey collected responses from 197 students of a public management course in distance mode. Structural equation modeling was operationalized by the method of partial least squares in Smart PLS software. The results showed that there is a relationship between quality, usability, value and value disconfirmation with satisfaction. Likewise, satisfaction proved to be decisive for the continuance intention use. However, there were no significant relationships between quality disconfirmation and usability disconfirmation with satisfaction. Based on the results, is discussed the theoretical and practical implications of the structural model found by the search.
Planejamento estratégico de tecnologia da informação e comunicação em instituições federais de ensino superior: construindo uma abordagem através de pesquisa-ação na UNIRIO
Authors: Paula Luiza Goncalves de , Araujo Renata Mendes , Tanaka Asterio Kiyoshi , Cappelli Claudia
Published: September 2015

Este artigo apresenta uma experiência de formulação de planejamento estratégico de Tecnologia da Informação e Comunicação (TIC) em uma Instituição Federal de Ensino Superior (IFES). A Pesquisa-Ação foi o método científico utilizado e as etapas do desenvolvimento da pesquisa são narradas. Os resultados (instrumentos, produtos e reflexões) obtidos são identificados como contribuições tanto para a aplicação do planejamento estratégico em outras IFES, como para a especificação de modelos de planejamento estratégico adequados às particularidades deste contexto organizacional. . A relevância dos resultados deste trabalho para a instituição é comprovada pela elevação do Índice de Governança de TI apurado pelo TCU.
Gestão da terceirização de TI: identificação do estado da arte por meio de um processo construtivista de investigação e análise bibliométrica
Authors: Ensslin Leonardo , Mussi Clarissa Carneiro , Chaves Leonardo Corrêa , Demetrio Sandro Natalino
Published: September 2015

Este trabalho tem como objetivo identificar e conhecer os mais relevantes artigos e seus parâmetros sobre o tema Gestão da Terceirização de Tecnologia da Informação por meio de um processo construtivista – Knowledge Development Process – Constructivist (ProKnow-C). Foram selecionados 23 artigos, compondo o Portfólio Bibliográfico (PB). A partir do PB evidenciou-se que: i) o periódico mais presente foi o The Journal of Strategic Information Systems; ii) o artigo mais citado foi Poppo, L. & Zenger, T. (2002); iii) o autor mais presente no PB foi o J. Goo; iv) os autores mais citados em geral foram L. P. Willcocks e M. C. Lacity; v) a palavra-chave mais presente no portfólio foi “Outsourcing”.
A abordagem de múltiplos critérios na priorização de projetos em um programa de mestrado profissional
Authors: Maccari Emerson Antonio , Martins Sergio Bomfim , Martins Cibele Barsalini
Published: September 2015

O objetivo deste estudo foi analisar como a abordagem de múltiplos critérios pode contribuir para a priorização de projetos dentro de um Programa de Mestrado Profissional no Brasil. Esta pesquisa desenvolveu-se por meio de um estudo de caso único, a partir de uma estrutura teórico-conceitual, que serviu de base para a elaboração e aplicação do questionário estruturado. Os resultados sugerem que os projetos Controle do Egresso e Protocolo de Produção Técnica/Tecnológica, além do quesito Corpo Docente, foram considerados prioritários e contribuiriam para a melhoria do desempenho no sistema de avaliação da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
Ottawa Ankle Rule: An Indian Perspective
Authors: Kumar Dharmendra , Singh Sudhir , Yadav Alok Kumar
Published: September 2015

Introduction

Foot and ankle injuries are common clinical conditions treated by orthopedic surgeons accounting for 6 to 12% of the patients seen in emergency. Currently, almost all patients with foot and ankle injuries undergo radiographic examination to exclude fractures; however, fewer than 15% of these patients actually have fractures, thus, most of these radiographs are unnecessary. Unwarranted radiographic examination increases the demands on the healthcare system and also results in prolonged patient waiting times. Ottawa ankle rule (OAR) evolved to reduce the number of radiography and waiting time for patients in emergency department by excluding fractures using only clinical examination. Although, it has good sensitivity but it has not been much popular and not included in medical curriculum.

Aim

The aim of the study is to implement the OAR in an Indian tertiary care trauma setup with two different levels of clinical examiners (1st year postgraduate junior resident and senior resident) and report the finding.

Materials and methods

This prospective study was done in the Department of Orthopedics, for a period of 15 months. Clinical examiners were shown and given a video presentation about the Oar and a printed copy of the rules were provided to all. Clinical diagnosis of both levels of clinical examiners were evaluated and analyzed.

Results

Three hundred cases met our inclusion criteria. In first clinical examination done by junior resident, 115 clinically significant fractures were suspected while senior resident suspected 69 fractures. Radiography showed 5 cases with missed fractures. Accuracy of OAR by JR is 82.33% and by SR is 97.0%.

Conclusion

Ottawa ankle rule are very effective and can identify all clinically relevant fractures of ankle and foot with increased accuracy and sensitivity when applied by a trauma specialists. Although, these rules can also be applied by general doctors so as to help them to screen patients who need radiography in acute ankle injury, but it is more sensitive when it is applied by specialist doctor.

How to cite this article

Singh S, Kumar D, Yadav AK. Ottawa Ankle Rule: An Indian Perspective. J Foot Ankle Surg (Asia- Pacific) 2015;2(1):8-12.
An Assessment of the Results of Controlled Fractional Distraction by Joshi's External Stabilization System in Club Foot
Authors: Sadana Ashwani , Pal Chandra Prakash , Dinkar Karuna Shankar
Published: September 2015

Club foot is amongst the most common of congenital deformities. Its incidence is 1 to 2 per 1000 live births. At birth, the diagnosis can be made by observing the foot for forefoot adduction, hindfoot inversion and equinus deformity. The study was conducted to evaluate the role of controlled fractional distraction in the management of neglected club feet by Joshi's external stabilization system (JESS). Total of 18 cases (22 feet) were studied, which were corrected by JESS. All cases were evaluated clinically, radiologically, podographically, and Pirani scoring system, both, before and after the correction. Severity of the deformities and clinical correction was assessed by Pirani score. All patients achieved good clinical results as per Pirani score, radiological evaluation showed that all subjects achieved the normal range of values.

How to cite this article

Sadana A, Pal CP, Dinkar KS. An Assessment of the Results of Controlled Fractional Distraction by Joshi's External Stabilization System in Club Foot. J Foot Ankle Surg (Asia-Pacific) 2015;2(1):13-16.
Correlation of Foot Bimalleolar Angle with Pirani Scoring System in Clinical Evaluation of Congenital Talipes Equinovarus
Authors: Dube Abhay Shankar , Gaur Manvender , Rastogi Avinash , Kapoor Rajat
Published: September 2015

The correlation of anteromedial foot bimalleolar angle with Pirani score evaluated prospectively in 120 children (204 feet) with congenital talipes equinovarus (CTEV). The patients were divided into groups I, II and III based on clinical severity before casting, having the Pirani score 0 to 2, 2.5 to 4 and 4.5 to 6 respectively. Mean foot bimalleolar angle 75.75°, 67.62° and 58.28° of groups I, II and III respectively was correlated by standard deviation with their Pirani scores to evaluate the severity difference among the groups before initiation of the casting treatment. The change in clinical severity or Pirani score was further correlated with the change in mean foot bimalleolar angle at the time of completion of casting and before bracing. The foot bimalleolar angle is an objective, quantitative and reproducible method which can be used to classify, prognosticate and to monitor the progress of the treatment.

Background

The prospective observational study on role of foot bimalleolar angle against the Pirani scoring in clinical evaluation of club foot in 120 children (204 feet) with mean age of 5.4 months treated by Ponseti technique of casting.

How to cite this article

Dube As, Gaur M, Rastogi A, Kapoor R. Correlation of Foot Bimalleolar Angle with Pirani Scoring System in Clinical Evaluation of Congenital Talipes Equinovarus. J Foot Ankle Surg (Asia-Pacific) 2015;2(1):17-21.
Subcutaneous Foot Phaeohyphomycosis due to Alternaria alternata
Authors: Jakkan Mithun Shriniwas , Agashe Vikas Madhav , Almeda Alan
Published: September 2015

Alternaria alternata, a saprophytic pigmented fungus, usually manifests in immunocompromised hosts. A case of 53-year-old male who underwent renal transplant 4 years back with recurrent foot swelling and previously misdiagnosed and treated for actinomycosis is presented. The swelling was completely excised, staining and culture diagnosed it to be Alternaria alternata infection which responded very well to oral voriconazole.

How to cite this article

Jakkan MS, Agashe VM, Soman R, Almeda A. Subcutaneous Foot Phaeohyphomycosis due to Alternaria alternata. J Foot Ankle Surg (Asia-Pacific) 2015;2(1):44-46.
Os Intermetatarseum Revisited: A Case Report of Rare Variant and Review of Literature
Authors: Rachha Rajesh , Gorva Anand
Published: September 2015

Os intermetatarseum is the rarest accessory bone of the foot. It is usually found between 1st and the 2nd metatarsal bases arising typically from the base of the 2nd metatarsal. Only a few symptomatic cases have been reported in the literature, which were either unilateral or bilateral and radiographically they were of different shapes and sizes. We present a large, bilaterally symmetrical and unusual variant of os intermetatarseum. To our knowledge, such large, bilaterally symmetrical, fully formed os intermetatarseum, fusing to both metatarsals has not been described before. The case report also describes the surgical anatomy during the excision of os intermetatarseum and review of the literature to date.

How to cite this article

Rachha R, Gorva A. Os Intermetatarseum revisited: A Case Report of Rare Variant and Review of Literature. J Foot Ankle Surg (Asia-Pacific) 2015;2(1): 47-50.
The Role of Alloying Elements on the Crevice Corrosion Behavior of Ni-Cr-Mo Alloys
Authors: Ebrahimi N. , Jakupi P. , Noël J.J. , Shoesmith D.W.
Published: September 2015

The roles of the alloying elements Mo, Cr, and W in resisting crevice corrosion of UNS N06022, UNS N06625, and UNS N10362 have been studied under galvanostatic conditions in 5 mol/L NaCl at 150°C. Corrosion damage patterns were investigated using surface analytical techniques such as scanning electron microscopy and optical imaging, and the corrosion products characterized by energy dispersive x-ray spectroscopy. While the Cr content of the alloy is critical in controlling initiation of crevice corrosion, the rate of activation (passive-to-active transition) is influenced by both the Cr and the Mo (and W) contents. The alloy’s Mo content also determines the distribution of corrosion damage within the crevice. In alloys with high Mo content, corrosion propagates laterally across the surface, while in alloys with low Mo content, it penetrates into the alloy. This can be attributed to the accumulation of molybdates (and tungstates), which stifle alloy dissolution at active sites. Thus, as the Mo content of the alloy increases in the order N06625 (9 wt% Mo) < N06022 (13 wt% Mo [3 wt% W]) < N10362 (22 wt% Mo), the depth of corrosion penetration decreases. In addition, once crevice corrosion initiates and the crevice acidifies, metal oxidation can also couple to proton reduction inside the crevice. The role of internal proton reduction in driving the crevice corrosion of these Ni alloys was found to be quite significant; greater than 50% of the corrosion damage is caused by proton reduction inside the crevice.
Do Soaring Global Oil Prices Heat up the Housing Market? Evidence from Malaysia
Authors: Le Thai-Ha
Published: September 2015

This study analyses the effects of oil price and macroeconomic shocks on the Malaysian housing market using a SVAR framework. The specification of the baseline model is based on standard economic theory. The Gregory-Hansen (GH) cointegration test reveals that there is no cointegration among the variables of interest. The results obtained from the Toda-Yamamoto (TY) non-Granger causality test show that oil price, labor force and inflation are the leading factors responsible for changes in the Malaysian housing prices. The findings from estimating generalized impulse response functions (IRFs) and variance decompositions (VDCs) indicate that oil price and labor force shocks are responsible for substantial fluctuations in the price of housing in Malaysia.
Past changes in the vertical distribution of ozone – Part 3: Analysis and interpretation of trends
Authors: Harris N. R. P. , Hassler B. , Tummon F. , Bodeker G. E. , Hubert D. , Petropavlovskikh I. , Steinbrecht W. , Anderson J. , Bhartia P. K. , Boone C. D. , Bourassa A. , Davis S. M. , Degenstein D. , Delcloo A. , Frith S. M. , Froidevaux L. , Godin-Beekmann S. , Jones N. , Kurylo M. J. , Kyrölä E. , Laine M. , Leblanc S. T. , Lambert J.-C. , Liley B. , Mahieu E. , Maycock A. , de Mazière M. , Parrish A. , Querel R. , Rosenlof K. H. , Roth C. , Sioris C. , Staehelin J. , Stolarski R. S. , Stübi R. , Tamminen J. , Vigouroux C. , Walker K. A. , Wang H. J. , Wild J. , Zawodny J. M.
Published: September 2015

Abstract. Trends in the vertical distribution of ozone are reported and compared for a number of new and recently revised data sets. The amount of ozone-depleting compounds in the stratosphere (as measured by equivalent effective stratospheric chlorine – EESC) was maximised in the second half of the 1990s. We examine the periods before and after the peak to see if any change in trend is discernible in the ozone record that might be attributable to a change in the EESC trend, though no attribution is attempted. Prior to 1998, trends in the upper stratosphere (~ 45 km, 4 hPa) are found to be −5 to −10 % per decade at mid-latitudes and closer to −5 % per decade in the tropics. No trends are found in the mid-stratosphere (28 km, 30 hPa). Negative trends are seen in the lower stratosphere at mid-latitudes in both hemispheres and in the deep tropics. However, it is hard to be categorical about the trends in the lower stratosphere for three reasons: (i) there are fewer measurements, (ii) the data quality is poorer, and (iii) the measurements in the 1990s are perturbed by aerosols from the Mt Pinatubo eruption in 1991. These findings are similar to those reported previously even though the measurements for the main satellite and ground-based records have been revised. There is no sign of a continued negative trend in the upper stratosphere since 1998: instead there is a hint of an average positive trend of ~ 2 % per decade in mid-latitudes and ~ 3 % per decade in the tropics. The significance of these upward trends is investigated using different assumptions of the independence of the trend estimates found from different data sets. The averaged upward trends are significant if the trends derived from various data sets are assumed to be independent (as in Pawson et al., 2014) but are generally not significant if the trends are not independent. This occurs because many of the underlying measurement records are used in more than one merged data set. At this point it is not possible to say which assumption is best. Including an estimate of the drift of the overall ozone observing system decreases the significance of the trends. The significance will become clearer as (i) more years are added to the observational record, (ii) further improvements are made to the historic ozone record (e.g. through algorithm development), and (iii) the data merging techniques are refined, particularly through a more rigorous treatment of uncertainties.
Diesel-related hydrocarbons can dominate gas phase reactive carbon in megacities
Authors: Dunmore R. E. , Hopkins J. R. , Lidster R. T. , Lee J. D. , Evans M. J. , Rickard A. R. , Lewis A. C. , Hamilton J. F.
Published: September 2015

Abstract. Hydrocarbons are key precursors to two priority air pollutants, ozone and particulate matter. Those with two to seven carbons have historically been straightforward to observe and have been successfully reduced in many developed cities through air quality policy interventions. Longer chain hydrocarbons released from diesel vehicles are not considered explicitly as part of air quality strategies and there are few direct measurements of their gaseous abundance in the atmosphere. This study describes the chemically comprehensive and continuous measurements of organic compounds in a developed megacity (London), which demonstrate that on a seasonal median basis, diesel-related hydrocarbons represent only 20–30 % of the total hydrocarbon mixing ratio but comprise more than 50 % of the atmospheric hydrocarbon mass and are a dominant local source of secondary organic aerosols. This study shows for the first time that 60 % of the winter primary hydrocarbon hydroxyl radical reactivity is from diesel-related hydrocarbons and using the maximum incremental reactivity scale, we predict that they contribute up to 50 % of the ozone production potential in London. Comparing real-world urban composition with regulatory emissions inventories in the UK and US highlights a previously unaccounted for, but very significant, under-reporting of diesel-related hydrocarbons; an underestimation of a factor ~4 for C9 species rising to a factor of over 70 for C12 during winter. These observations show that hydrocarbons from diesel vehicles can dominate gas phase reactive carbon in cities with high diesel fleet fractions. Future control of urban particulate matter and ozone in such locations requires a shift in policy focus onto gas phase hydrocarbons released from diesels as this vehicle type continues to displace gasoline world-wide.