Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2731

SRE Articles

October 2013

Environmental challenges of Millennium Development Goals (MDGs) 4, 5 and 6: The roles of midwives in Nigeria

    With less than five years to the 2015 target set by the United Nations for the achievement of the Millennium Development Goals (MDGs), MDGs 4, 5 and 6 are still far from being achieved. Nigeria has the second highest maternal mortality and eighteenth highest child mortality in the world. Efforts to combat HIV and other diseases have recorded only marginal success. This paper identified...

Author(s): Akin-Otiko, Bridget Omowumi

October 2013

Study on the health-related quality of life after surgical treatment for lumbar stenosis

  Lumbar stenosis (LS) affected middle-aged people and may cause severe symptoms and functional impairment at lower limbs. We conducted a study in China to assess the HRQoL in patients operated on for LS, and investigate the possible determinants of HRQoL. From June 2008 to June 2010, 60 patients have been surgically treated for lunbar stenosis in our Hospital. The medical outcomes study short Form 36 (SF-36)...

Author(s): Yu FU, Zhenming HU, Hongjun HUO, Xuejun YANG, Yulong XIAO, Wenhua XING, Yan ZHAO and Feng LI

October 2013

Determination of the effects of bioethanol-diesel fuel blends containing Beraid ED10 additive on engine performance and emissions in a diesel engine with a pump injection system

  In the present study, the effects of bioethanol-diesel fuel- Beraid ED10 additive blends on engine performance and emissions were investigated on a four-stroke, three-cylinder, water-cooled, turbocharged diesel engine with a pump injection fuel system. Low-sulphur Eurodiesel fuel, BE5 (5% bioethanol – 93% euro diesel – 2% Beraid ED10), BE10 and BE15 fuels were used in the experiments. The changes...

Author(s):   Hasan AYDOGAN and Mustafa ACAROGLU    

October 2013

Efficacy of imidacloprid (Confidor 200SL) and improved cultural practices in the control of the green date palm pit scale insect (Asterolecanium phoenicis Rao.) (Palmapsis phoenicis) (Homoptera: Asterolecaniidae) in Northern Sudan

  Experiments were undertaken in Elgaba scheme for two seasons (1999/2000 and 2000/2001) to evaluate the efficacy of imidacloprid (as Confidor 200SL) as part of a technical cultural practices package (earthing, pruning and regular irrigation) in the control of the date palm green pit scale insect Asterolecanium phoenicis (Rao). Four doses of Confidor 200SL (15, 20, 25 and 35 ml/palm) were compared...

Author(s): Mahdi Abdelrahman Ahmed, Azhari O. Abdelbagi, Hamadttu A. F. Elshafie, E. A. Fageer and Ihsan A. Abass

October 2013

Constraint models for the bandwidth minimization problem

  The satisfiability problem (SAT) is a well studied problem in logic which searches for a truth assignment of a set of Boolean variables that evaluates a specific formula to true. The bandwidth minimization problem for graphs (BMPG) is a well studied problem in graphs and requires finding the labels of the nodes of a graph such that the maximum absolute difference among neighbors is minimized. This paper...

Author(s): Nelson Rangel-Valdez and Jose Torres-Jimenez

October 2013

Barley grain yield path analysis (Hordeum disticum L.) in dry regions of Iran

  In order to determine the correlation and relationship between the grain yield and other important traits in 24 genotypes of barley, an experiment was conducted in Dry Land Research Station of Shirvan. The experimental design was a randomized complete block with three replications. The evaluated traits were grain yield, days to emergence, days to heading, days to maturity, plant height, plant coverage...

Author(s): Seyed Morteza Azimzadeh and Seyed Javad Azimzadeh

October 2013

Investigation of freeway traffic control strategies’ performance

  This paper focus on evaluation of impacts of traffic control strategies on traffic congestion relief. The traffic simulation network is modeled in a traffic microsimulation environment and the calibration with the real world data. As for traffic control strategies, fixed-time ramp metering, speed limit control and integrated control are tested and performances are compared with the actual condition along the...

Author(s): Kesten A. Sercan, Ergün Murat and Yai Tetsuo    

October 2013

Dynamics of interstitial calcium in rat myocardial ischemia reperfusion injury in vivo

  Intracellular calcium ([Ca++]ic) overload is the key factor for myocardial ischemia reperfusion injury(IR), however there was no report for interstitial Ca++ concentration ([Ca++]ex) dynamics. This research aims to plot the [Ca++]ex dynamics in rat myocardial IR in vivo. A microdialysis system was composed and the time delay of the system, recovery time, was introduced and tested with a fluids switching...

Author(s): Huang Shaohong, Li Yun, Chen Huiguo, Wu Zhongkai and Rong Jian,    

October 2013

In vitro evaluation of plant extracts against Alternaria brassicae (Berk.) Sacc. causing leaf spot of mustard and Fusarium oxysporum f. sp. lycopersici causing wilt of tomato

Extracts of five plants viz. Azadirachta indica, Lantana camara, Ocimum sanctum, Eucalyptus globulus and Calotropis gigantea were evaluated in vitro by poison food technique (PFT) @ 3, 5, 7 and 9% concentrations against Alternaria brassicae andFusarium oxysporum f. sp. lycopersici causing blight of mustard and wilt of tomato respectively. In vitro study...

Author(s): S. A. Ganie, V. R. Pant, M. Y. Ghani, Ashiq Hussain Lone, Qaisar Anjumand S. M. Razvi    

October 2013

Reconditioning effect of oligodendrocyte-like cell transplantation in acute spinal cord injury in rats

To observe the reconditioning effect of oligodendrocyte-like cell transplantation in acute spinal cord injury in rats, bone marrow mesenchymal stem cells were differentiated into oligodendrocyte-like cells induced by cytokines including insulin-like growth factor-1(IGF-1). Rats with acute spinal cord injury were treated with the oligodendrocyte-like cells for 8 weeks by local injection. The therapeutic effect was...

Author(s): Yongtao Xu, Anmin Chen, Feng Li and Hougeng Lu

October 2013

A hybrid approach for text categorization by using x2 statistic, principal component analysis and particle swarm optimization

Today, the number of text documents in digital form is progressively increasing and text categorization becomes the key technology of dealing with organizing text data. A major problem of text categorization is a huge-scale number of features. Most of those are useless, irrelevant or redundant for text categorization. Therefore, these features can decrease the classification performance. In order to eliminate this...

Author(s): Harun Uğuz    

October 2013

Pediculosis among primary school children in Calabar, Nigeria and implications for control

This study was undertaken to determine the prevalence of head lice among primary school children in a semi-urban area of Calabar, Cross River State, Nigeria. A total of 204 children aged 6 to 12 years from both genders had their hair and scalp examined by visual inspection for head lice. A questionnaire was used to assess children’s knowledge about the ectoparasite – Pediculus humanus capitis. The...

Author(s): Etim S. E., Ohioma M. E., Okon O. E. and Akpan P. A.

October 2013

Effects of baffles geometry on sloshing dynamics of a viscous liquid tank

Baffles are used effectively to reduce the sloshing response of liquid in the liquid storage containers. In this paper, a brief equivalent method is proposed to model the influence of different baffle geometrical effects on liquid sloshing. It has been showed that the natural frequencies and the dynamic response of the liquid in the container are drastically changed if the free liquid surface in a cylindrical container...

Author(s): Morteza Shahravi and Milad Azimi

October 2013

Diurnal variation in stature in Nigerian children

While total stature has been demonstrated to decrease throughout the day, whether a diurnal effect applies to Nigerian children has not been reported, the aim of this study was to investigate diurnal stature variation in school children in Makurdi, Nigeria. The stature of 625 children aged 9 to 16 years were measured twice (morning and afternoon) on the same day with a wall mounted stadiometer. The first measurements...

Author(s): Daniel T. Goon, Abel L. Toriola and Simon W. Akusu

October 2013

Psychological impotence: Psychological erectile dysfunction and erectile dysfunction causes, diagnostic methods and management options

Psychological impotence or erectile dysfunction is nowadays a pretty common yet misunderstood disorder. People often cannot detect it properly and misunderstood it for physical impotence. Psychological impotence is basically caused by psychological problems. Most of the times, this kind of impotence are curable. Recent study has shown that most of the cases of impotence are basically of this nature. Numbers of sexual...

Author(s): Kingston Rajiah, Sajesh K Veettil, Suresh Kumar and Elizabeth M. Mathew

October 2013

Duration magnitude calibration of Kuwait national seismic network

One type of magnitude formula is preliminarily developed from Kuwait National Seismic Network (KNSN) data which is intended for application by the network in its seismic monitoring activities. This is the duration magnitude scale of measurement which is empirically determined and expressed as: MD = 2.66 log (t) + 0.036Δ - 1.97+ Ci. The magnitude formula is the result from applying...

Author(s): Nassir S. Al-Arifi, Saad Al-Humidan, and Aref Lashin,

October 2013

Structural, petrographic and mineralogical characteristics and diagenetic aspects of Kandira stone from Northwestern Turkey

Kandira stone is a unique Late Cretaceous (Campanian-Maastrichtian) carbonate rock quarried by small enterprises in Northwestern Turkey. The rock has been used as a construction material in a variety of applications such as cladding and paving, flooring and stairs, roofing and fireplaces. Recently, the demand for this stone in the production of intricately sculpted shapes has raised questions about...

Author(s): Sefik Ramazanoglu, Ayman El Saiy, Osman Abdelghany and Hasan Arman

October 2013

Wireless electrocardiography system

Design and realization of a wireless PC-based system for electrocardiography and data acquisition of a patient's heart condition is described in this paper. The system is designed and realized according to virtual instrumentation concept consisting of two subsystems: 1) The battery powered external compact and mobile wireless ECG acquisition hardware on the side of patient and USB connected communication wireless...

Author(s): Aleksandar Č. Žorić, Siniša S. Ilić, Đurđe Perišić, Slobodan Obradović and Petar Spalević

October 2013

Use of factorial experimental design for analyzing the effect of storage conditions on color quality of sun-dried tomatoes

Color of sun-dried tomato is an important quality criteria and color stability of sun dried tomatoes is affected by storage conditions such as temperature, time and packaging type. The objective of this study was to investigate the effects storage time, storage temperature and packaging type on color stability of sun-dried tomatoes by using factorial experimental design. In this study, the 23 factorial design was...

Author(s): Bilge Akdeniz, Dilek Demirbüker Kavak and Neriman Bağdatlioğlu

October 2013

Hematological changes before and after hemodialysis

Renal failure is a situation in which kidney fails to function adequately. There are two forms of renal failure: acute and chronic. End-Stage renal disease is the final stage of chronic renal failure where there is a progressive, irreversible deterioration in renal function which can be substituted by renal replacement therapy, haemodialysis (HD), peritoneal dialysis, or transplantation. The aim of this study was...

Author(s): Abdullah Khader Alghythan and Abbas H. Alsaeed

October 2013

Botanical characteristics of chickpea genotypes (Cicer arietinum L.) under different plant densities in organic farming

This study was performed in Nurdagi district of Gaziantep Province of Turkey in 2011 growing season. Inci and 55-C chickpea (Cicer arietinum L.) genotypes were sowed at 30, 40, 50 and 60 plant m-1 plant densities and the effects of sowing densities on plant botanical characteristics were investigated. In the research, plant height, first pod height, number of first branch, number of second branch and stem...

Author(s): Alihan COKKIZGIN

October 2013

Effect of oxidative stress on viability and virulence of environmental Acinetobacter haemolyticus isolates

The effect of oxidative stress exerted by 0.03% crystal violet, 0.3% bile salt, 4.0% NaCl and 8% ethanol on the survival and production of virulence factors amongAcinetobacter haemolyticus isolates obtained from wastewater and river water samples was investigated. Though generally there was insignificant lethal effect against all the isolates, crystal violet exerted the highest lethal effect...

Author(s): James Hamuel Doughari, Patrick Alois Ndakidemi, Izanne Susan Human and Spinney Benade

October 2013

APS-initiated graft copolymerization of N-Vinyl pyrollidone onto gelatin: Preparation, characterization, and optimization of grafting parameters

In this work, large numbers of hydrophilic functional groups were introduced onto gelatin by grafting with N-vinyl pyrollidone monomer. The graft copolymerization reactions were carried out under nitrogen atmosphere using ammonium persulfate (APS) as an initiator. The graft copolymer was characterized by Fourier transform infrared spectra, thermo-gravimetric analysis and solubility test. The existence of...

Author(s): Mohammad Sadeghi, Esmat Mohammadinasab and Fatemeh Shafie

October 2013

Molecular-based marker for sex differentiation of jojoba in vivo and in vitro Iraqi cultivars using RAPD- PCR technique

The objective of this study was to distinguish between males and females of jojoba (Simmondisia chinensis) using Random Amplified Polymorphic DNA (RAPD) markers in order to detect any DNA variation. A callus was produced from both male and female jojoba leaves, using MS medium with BA 0.5 and 2 to 4, D 2.5 mg/l respectively. Genomic DNA of jojoba plant was extracted using CTAB method. The concentration of DNA...

Author(s): Jameel R. Al-Obaidi, Bilal .K. Suliman and Nabeel .K. Al-Ani

October 2013

Human Resources Performance Analysis based on a Hybrid Method

Improving human resources performance (HRP) is the most important task of the century. However, we have few measures or management interventions to make such improvement possible; although we cannot identify the pattern to be followed by human resources because systems and processes in an organization are often regarded as a kiss of death to encouraging creativity. For improving human resource performance, at first, HRP...

Author(s): Asadallah Najafi

September 2013

Laboratories at the Faculty of Medicine of the University of Coimbra in the XIX century

The beginning of natural sciences came to predominate in medicine with the emergence of natural scientific thinking in the first half of the 19th century. Philosophical approaches became less relevant. Research concentrated on the biological, physiological and chemical foundations of life. Therefore, the creation of laboratories of experimental physiology, histology, toxicology and pathological anatomy was the result of...

Author(s): Maria Burguete

  • Article Number: 462235C17311

September 2013

Policies on population, development and pollution of the Black Sea basin

The Black Sea is a closed basin which is connected to Aegean Sea through Bosporus and Dardanel Straits: The basin is encircled with six countries from which major rivers Danube, Dniester, Dnieper, Yeşilirmak, Kizilirmak and Sakarya run through to the sea, which carry and discharge pollution from industrial, agricultural and domestic sources to Black Sea Basin that grows cumulatively. They discharge into virtually...

Author(s): D. S. Beyazli, Z. Y. Bayram and S. Aydemir

  • Article Number: 7CA3FE517325

September 2013

Wireless attendance management system based on iris recognition

Iris recognition verification is one of the most reliable personal identification methods in Biometrics. With the rapid development of iris recognition verification, a number of its applications have been proposed until now including time attendance system etc. In this paper, a wireless iris recognition attendance management system is designed and implemented using Daugman’s algorithm (Daugman, 2003). This system...

Author(s): Seifedine Kadry and Mohamad Smaili

  • Article Number: 29903A917333

September 2013

Job satisfaction among selected workers in St Lucia, West Indies

The aim of this study was to investigate the level of job satisfaction among supermarket workers. A self administered questionnaire survey was conducted from July-September 2007. Data were collected from 111 supermarket workers in a major supermarket located in Vieux Fort, Saint Lucia. Respondents were asked to complete a 10-item job satisfaction questionnaire. The response rate was 74%. The percentage of satisfied...

Author(s): R. O. Orisatoki and O. O. Oguntibeju

  • Article Number: 706C50D17341

September 2013

Thermo elastic analysis of a functionally graded cylinder under internal pressure using first order shear deformation theory

Thermo elastic analysis of a functionally graded cylinder under mechanical and thermal loads is investigated analytically in the present paper. The first order shear deformation theory (FSDT) is employed for analysis of the problem. FSDT recognizes two components for definition of the deformation. Displacement of the mid-plane and rotation about that are two components of deformation. The modulus of elasticity is...

Author(s): M. Arefi and G. H Rahimi

  • Article Number: AFB1DB917347

September 2013

Estimating soil available nitrogen with a hot H2O2/KCl extraction

Appropriate and simple analysis methods for an accurate estimation of soil N mineralization potential are required to optimize N fertilizer recommendations. We used soils from non-cultivated and cultivated plots in central Côte d’Ivoire to investigate the quantum of ammonium (NH4+) that could potentially be mineralized. The soil was first treated with H2O2 at 60°C for 2, 4, 6 or 8 h (and referred to...

Author(s): T. B. Tié, L. N. Diby, , E. Seyo and A. Assa

  • Article Number: 477362B17356

September 2013

Developing prototype model of discharge planning with CD learning media in Indonesia

Discharge planning (DP) is a crucial part in continuous nursing care and its aim is to prepare the patient and the family to return home. Discharge planning has not been optimally conducted. The study’s purposes are to identify the implementation of discharge planning, to develop an organized discharge planning model and to evaluate the implementation of this model. An action research with triangulation studies...

Author(s): Rr. Tutik Sri Hariyati, Efy Afifah and Hanny Handiyani  

  • Article Number: 8C5B1D517366

September 2013

Prediction of climatic change for the next 100 years in Southern Italy

This study investigates the impact of the expected climate changes in the Apulia region (Southern Italy) for the next 100 years on the climatic water balance variations, climatic classifications and crop water requirements. The overall results indicated that an increase of temperature, in the range between 1.3 and 2.5°C, is expected in the next 100 years. The reference evapotranspiration (ETo) variations would...

Author(s): Burçak Kapur, Steduto Pasquale, Servet Tekin, Mladen Todorovic, S. Metin Sezen, Mete Özfidaner and Zekai Gümüş

  • Article Number: D9ADF7117374

September 2013

Etiologies of patients admitted to emergency department with hypoglycemia

Hypoglycemia is the most common endocrinologic problem seen in emergency departments. To explore its causes in patients who admitted to the emergency department with symptoms resembling hypoglycemia, 225 hypoglycemia cases were evaluated from January 2000 to May 2008. Of 225 hypoglycemia cases, 158 (70.2%) were receiving treatment for diabetes mellitus, which was the most common group (94 patients were using insulin, 55...

Author(s): Sevki Hakan Eren, Haci Mehmet Caliskan, Fatih Kilicli, Ilhan Korkmaz, Fettah Acibucu and Hatice Sebila Dokmetas

  • Article Number: 597EED017384

September 2013

Analysis of missing values in simultaneous linear functional relationship model for circular variables

Missing values arise in many research fields and is a common problem in analysis. Unlike linear data, the methods proposed to handle missing values for circular variables have not been developed. This could be contributed to the closed form of circular variables. An imputation methods based on circular mean by column and sample circular mean are proposed for the simultaneous linear functional relationship model for...

Author(s): S. F. Hassan, Y. Z. Zubairi and A. G. Hussin

  • Article Number: 89CE48517397

September 2013

Variations in alanine aminotransferase and aspartate aminotransferase activities in African catfish: Clarias gariepinus (Burchell, 1822) at different sublethal concentrations of potassium permanganate

Potassium permanganate (KMnO4) is a widely used freshwater aquaculture chemotherapeutant for the treatment and prevention of waterborne parasitic and fungal diseases. The specific objective of this research is to determine its effects on alanine aminotransferase and aspartate aminotransferase activities in the plasma of the widely consumed African catfish, Clarias gariepinus. C. gariepinuswere exposed to...

Author(s): Kori-Siakpere Ovie, Ikomi Robert Bemigho and Ogbe Martin Gbemi

  • Article Number: 0E05DE517492

September 2013

Particle swarm optimization performance on special linear programming problems

Linear programming (LP) is one of the best known optimization problems solved generally with Simplex Method. Most of the real life problems have been modeled as LP. The solutions of some special LP problems exhibiting cycling have not been studied except for the classical methods. This study, aimed to solve some special LP problems, exhibit cycling with Particle Swarm Optimization (PSO) and to show PSO performance for...

Author(s): Pakize Erdoğmuş  

  • Article Number: 42EBD5417506

September 2013

Pre-service mathematics teachers’ conceptions about the relationship between continuity and differentiability of a function

Our purpose in this paper is to investigate and show how pre-service mathematics teachers think about the continuity and differentiability of functions given in the form of both graphical and symbolic  representations and how they link these two basic and important calculus concepts. The study was conducted in two phases. First, the participants were asked to complete several tasks...

Author(s): Adem Duru, Önder Köklü and Elizabeth Jakubowski

  • Article Number: 884941817779

September 2013

Determination of sound transfer coefficient of boron added waste cellulosic and paper mixture panels

When the studies about the effects of noise on the human health were investigated, it was determined that the noise has physiological, pathological, psychological and psycho-social results and affects sense organs, circulatory, respiration, digestion, excretory and nervous systems in terms of physiology. In this research, a sound insulation study was carried out in order to minimize the negative effects of sound on the...

Author(s): Abdulkerim Ilgun, M. Tolga Cogurcu, Celalettin Ozdemir, Erkan Kalipci and Serkan Sahinkaya  

  • Article Number: FEF946017811

September 2013

Adaptive bandwidth allocation for call-level quality-of-service (QoS) in wireless mobile networks

Different quality-of-service (QoS) required types of multimedia services and need a guaranteed service rate in wireless multimedia networks. When the number of user arrivals increases, bandwidth degradations may occur due to limited bandwidth nature of cellular wireless networks. The bandwidth that should be assigned to user cannot be met for QoS provisioning in congested network. In this paper, a priority-based call...

Author(s): Aytül BOZKURT  

September 2013

Evaluation of the productivity of soil amended with different animal wastes in an acid ultisol at Abakaliki, Southeast Nigeria

An experiment was carried out in order to evaluate the productivity of soil amended with different animal wastes at the Teaching and Research Farm at the Faculty of Agriculture and Natural Resources Management, Ebonyi State University, Abakaliki. The field was laid out in randomized complete block design (RCBD) comprising of poultry droppings (PD), swine waste (SW), goat droppings (GD), cow dung (CD) and control (c)...

Author(s): Nwite J. N., Okolo C. C. and Ezeaku, P. I.

September 2013

Effect of crop fortification with pulse sprout extract on crop growth and seed yield in rice var Co 48

Rice is the staple food for over half of the Indian population, hence great emphasis has to be laid on ways and means to fortify seeds organically for better seed vigour. Seed fortification is one of the important seed invigoration treatment. Germinated grains are good sources of ascorbic acid, riboflavin, choline, thiamine, tocopherols and pantothenic acid which increases the nutritional quality. Extract has been...

Author(s): Jayanthi M., R. Umarani, and V. Vijayalakshmi,

September 2013

Wear resistance in hardfacing applied in substrate SAE 1020 using welding process Gas Tungsten Arc Welding (GTAW) alloy Stellite 6 in powder form

This article describes an innovative application of hardfacing using Gas Tungsten Arc Welding (GTAW) process with alloys in powder form incorporated directly into the weld puddle. Stellite 6 alloy was used on the substrate of SAE 1020 steel mainly due to wear resistance. The good wear resistance is due to the characteristics of Co-Cr carbide dispersed in a matrix alloy deposited. Vickers hardness data,...

Author(s): Paulo Cezar Moselli, Marcelo Falcão de Oliveira and João Roberto Sartori Moreno

September 2013

Hydromorphone (OROS): Its efficacy in acute and chronic pain

Pain control in chronic and acute disease conditions such as cancer pain or post-operative pain is often adequate with the help of appropriate pharmacological agent. A comprehensive review of numerous studies conducted to evaluate the efficacy of hydromorphone (OROS) for the management of acute and chronic pain was performed. Data from 17 controlled trials were reviewed, taking into consideration the...

Author(s): Rohit Kumar Verma, Piyush Mittal, Ankur Barua and Suresh Kumar

September 2013

Use of mycorrhiza in soil remediation: A review

Mycorrhiza-assisted remediation (MAR) is a sustainable method of remediation that uses natural organisms for soil remediation. It is a technique that not only ensures the removal of soil pollutants but also improves the structure of the soil and helps in plant nutrient acquisition. Thus, it helps in vegetation/revegetation of polluted soils after treatment. MAR can be used for the removal of both organic and inorganic...

Author(s): Chibuike, G. U.

September 2013

Analysis of the link between injuries on forest trees and presence of harmful fungal organisms

This research focus on the occurrence of pathogenic microorganisms on beech trees relative to the presence of tree injuries, with the aim to ensure protection and preservation of this species in Serbia. The research was conducted in eastern Serbia, in a hillside beech forest Fagetum moesiacae submontanum of generative origin. The testing was carried out on two sites over 51 testing plots, with a total of 829 trees and...

Author(s): Miroslava MARKOVIC, Dragan MITIC, Snezana RAJKOVIC, Ljubinko RAKONJAC, Aleksandar LUCIC, Miroslav MARKOVIC and Radoslav RAJKOVIC

September 2013

Hybrid particle swarm optimization: Evolutionary programming approach for solving generation maintenance scheduling problem

This paper presents a hybrid particle swarm optimization based genetic algorithm and hybrid particle swarm optimization based evolutionary programming for solving long-term generation maintenance scheduling problem. In power system, maintenance scheduling is being done upon the technical requirements of power plants and preserving the grid reliability. The objective function is to sell electricity as much as possible...

Author(s): G. Giftson Samuel and C. Christober Asir Rajan

September 2013

Comparison of an analogue and computer supported line generalisation following the concrete example of the Sitnica River system

Cartography is a science which most presents changes over ever increasing modern computer technologies. A computer supported generalisation of water flow sets its goal on the effects and achievements of modern cartography science, also showing the results and the levels of basic manual generalisation, comparing them with the effects of a digital computer supported generalisation. Every newly made map which represents...

Author(s): Aleksandar Valjarević, Dragica Živković and Vladica Stevanović

September 2013

Salient features of vector control in AC motor drives: A review

This paper presents a review of vector control methods for AC drives for the last decade. A variety of techniques with different concepts are mentioned for the control of induction motors (IMs), permanent magnet synchronous motors (PMSMs), double fed induction generators (DFIGs) and switched reluctance motors (SRMs). Vector control has advanced its concept to AC drives for high performance applications with the help of...

Author(s): Sarat Kumar Sahoo and A. Ramulu

September 2013

Field-programmable gate array (FPGA)-based designed using VHDL hardware description language transmission performance analysis of binary phase shift keying (BPSK) and quadrature phase shift Keying (QPSK) modulators

Binary phase shift keying (BPSK) and quadrature phase shift Keying (QPSK)modulation techniques are often proposed for satellite communications and band-limited communication channels; however, both modulations are important in high speed data communications. High speed data communications are implemented on high speed hardware in wireless systems. The paper presents the design of a QPSK and BPSK...

Author(s): Mehmet SÖNMEZ and Ayhan AKBAL

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