Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2748

SRE Articles

Performance evaluation of technological innovation capabilities in uncertainty

April 2013

The evaluation of technological innovation capabilities (TICs) depends on determining multiple criteria and on building a performance and implementation plan. There are intensive studies on the issues of TICs which have been dealt with extensively by practitioners and academicians, however, studies on the implementation and performance evaluation are few. This study proposes the approach of adopting trapezoid fuzzy...

Author(s): Yuan-Hsu Lin, Ming-Lang Tseng, Yi-Li Cheng, Anthony S. F. Chiu and Yong Geng

Enzymatic bioconversion of kraft pulped and oxidative delignified sawdust from the Lagos Lagoon, Nigeria into fermentable sugars

April 2013

The major obstacle during pretreatment of lignocellulosic biomass centers mostly on the insufficient separation of lignin from cellulose that could further be converted into bioenergy and other useful chemicals. The choice of an optimum biomass pretreatment process depends on the digestibility of lignocellulosic material, cost-effectiveness and overall impact on the environment. Kraft pulp samples from sawdust wastes...

Author(s): N. A. Ndukwe, W. O. Okiei, B. I. Alo, J. P. H. van Wyk, T. M. Mamabolo and C. C. Igwe

A review on thermoelectric cooling modules: Installation design, performance and efficiency

April 2013

A thermoelectric cooling module (TECM) is defined as a solid-state heat pump and present advantages (for example, no moving parts and no harmful gasses) over other refrigeration technologies. However, to optimally use TECMs as high efficient heat pumps it is crucial to understand the factors that influence the performance and efficiency of these modules during the installation design phase. This paper therefore provides...

Author(s): Rupert Gouws and Houston Eilers

Crustal structure of the Northwestern part of the Arabian Shield in Saudi Arabia deduced from gravity data

March 2013

  The present-day tectonics of the Northwestern Region of Saudi Arabia is affected by the tectonics related to the Red Sea floor spreading. The tectonic movemets related to the Red Sea floor spreading creat great variations in the crustal structure and depth of Moho discontinuity through this region. Gravity data have been acquired from Earth Gravitional Model (EGM-2008) and analyzed to estimate the crustal...

Author(s):   Fnais M.S., El-Araby H. M., Kamal Abdel-Rahman, Elawadi I. and Al Soma A.

Magnetic field effect on phase separation process in a liquid mixture

March 2013

  In this work, the statistical properties of the frequency distribution curves and the autocorrelation functions of the scattered photons from a laser beam incident on a liquid mixture approaching its phase separation temperature under an applied magnetic field in a dynamic light scattering experiment were employed in the study of the physical behavior of the scattering centers within the samples and in the...

Author(s):   Kachain Dangudom  

Image authentication using perceptual hashing

March 2013

  This paper presents a review of image authentication methods, based on the perceptual image hashing approach. Firstly we analyze two algorithms, which have the capability of determining if an image is authentic or not, even if it has suffered content preserving distortions such as compression, filtering and other signal processing operations; as well as some malicious modification such as geometric...

Author(s):   Kelsey Ramirez-Gutierrez, Mariko Nakano-Miyatake and Hector Perez-Meana  

Determination of spatiotemporal distribution of Agricultural drought in Central Serbia (Å umadija)

March 2013

  Over the past several decades, extreme drought events have become increasingly frequent in Central Serbia and have affected vast areas of land. In agriculture, the impact of drought is dramatic, especially if the soils in the affected area are shallow, like in most of the Šumadija Region where field crops, fruits and grapevines are traditionally rainfed. Exceptionally dry years have a multiple-year...

Author(s):   Stričević Ružica and Djurović Nevenka

Storage of open-pollinated maize variety seeds in active cattle kraal to suppress maize weevils and improve seed quality and seedling vigour

March 2013

  Open-pollinated maize (Zea mays) varieties remain popular in marginal communities since seeds can be selected and stored for the next season. However, maize weevil (Sitophilus zeamais) is an economic post-harvest pest of maize grains, which is difficult to manage. Various indigenous seed storage technologies had been in use within marginal communities, with little empirically-based support of their...

Author(s):   Phatu W. Mashela and Kgabo M. Pofu 

Isolation of Bacillus sphaericus screening larvicidal, fecundity and longevity effects on malaria vector Anopheles stephensi

March 2013

  In India, the most important diseases transmitting mosquitoes belong to the genera Anopheles, Culex, Aedes and Mansonia. The indiscriminate use of synthetic insecticides creates multifarious problems like environmental pollution, global warming, insecticide resistance and is hazardous to humans. In the present study, bacterial pesticide, Bacillus sphaericus a soil dwelling bacteria, isolated from...

Author(s):   A. Naresh kumar, K. Murugan, K. Shobana and D. Abirami   

Investigation of the final stages of a P4-like coliphage infection in Escherichia coli through scanning, transmission and nano-scanning-auger electron microscopy (NanoSAM)

March 2013

Enlargement of bacterial cells during bacteriophage replication has been observed in the past with T-even, Lambda and N4 bacteriophages by the use of transmission electron microscopy (TEM) and light microscopy techniques and hypotheses explaining the enlargement of bacteriophage-infected cells have been postulated in literature. In this study, enlarged Escherichia coli cells were observed using scanning...

Author(s):   Wouter A. van der Westhuizen, Johan L. F. Kock, Elizabeth Coetsee, Pieter W. J. van Wyk, Hendrik C. Swart and Robert R. Bragg

Assessment of soil erosion in the Ihsaniye watershed area, Afyonkarahisar, Turkey

March 2013

  This article discusses research in which the authors apply the Universal Soil Loss Equation (USLE), Geographical Information Systems (GIS) and Remote Sensing (RS) to the mapping of the soil erosion risk in the Ihsaniye watershed, Afyonkarahisar, Turkey. The rainfall-runoff erosivity (R) factor was developed from annual precipitation data and from previous studies. Soil maps and soil survey data were used to...

Author(s):   Ünal Yildirim and Tevfik Erkal  

Evaluation of patient safety culture: Single-center, non-randomized, cross-sectional study, Department of General Surgery, Faculty of Medicine, Trakya University, Turkey experience

March 2013

  This study aims to measure and analyze the patient safety culture in General Surgery Department, Faculty of Medicine, Trakya University, Edirne-Turkey. A cross-sectional study, utilizing the Turkish version of the Hospital Survey on Patient Safety Culture developed by the Agency for Healthcare Research and Quality and a demographic questionnaire was distributed to 125 health professionals including...

Author(s):   Tamer Sagiroglu, Serhat OÄŸuz, Mehmet Ali YaÄŸcı, Hilmi Tozkır and Tülin Yalta   

A preliminary study on characterisation of mechanical behaviour of hydrated cement treated crushed rock base using the disturbed state concept

March 2013

For road pavements in Western Australia, base layers are usually constructed using hydrated cement treated crushed rock base (HCTCRB) of which the mechanistic properties with the reliable material model are necessary for rational pavement analysis and design. The purpose of this study is to present the experimental results produced from the assessment of the mechanical behaviour of HCTCRB and the material modelling...

Author(s):   Pakdee Khobklang, Vanissorn Vimonsatit, Peerapong Jitsangiam and Hamid Nikraz

Interaction between suspended and settled solid particles in cassava wastewater

March 2013

  Cassava (Manihot Esculenta, Crantz) is a very important staple food in most developing countries. During its processing into cassava flour or garri, wastewaters are generated and are indiscriminately discharged into the public sewers or into the environment and in some cases; the fermented wastewater is usually poured into latrines with the aim of degrading sewage. This study is aimed at finding out...

Author(s):   Olukanni D. O., Agunwamba J. C. and Abalogu R. U.

A note on absolute summability factor theorem and almost increasing sequences

March 2013

  Quite recently Savas (2008) has proved a theorem on- summability factors of an infinite series. The present paper deals  with a further generalization of it.   Key words: Absolute summability, almost increasing, weighted mean matrix, summability factor.

Author(s):   Ekrem SavaÅŸ

Field-Programmable Gate Array (FPGA) Implementation of Lapped Biorthogonal Transform for JPEG XR Compression

March 2013

  This paper describes the hardware implementation of Lapped Biorthogonal Transform (LBT) on Field-Programmable Gate Array (FPGA) for JPEG XR Image compression. The implementation is based on dividing image into 128×128 dimension tiles with each tile processed independently. Two main operations that is, overlap pre-filtering and forward core transform are applied on each tile. The proposed...

Author(s):   Muhammad Riaz ur Rehman and Gulistan Raja 

Diversity and abundance of insect species at Kota Damansara Community Forest Reserve, Selangor

March 2013

  A study was conducted on the diversity and abundance of insect species at Kota Damansara Community Forest Reserve in order to determine the richness of the forest insect fauna. A total of 774 insects from 13 Orders and 79 Families were recorded. This study shows that Coleoptera (42.63%), Hymenoptera (17.96%), Diptera (10.08%) and Orthoptera (10.85%) were the most dominant Orders in the Forest Reserve. The...

Author(s):   Khadijah A. R., Azidah A. A. and Meor S. R.  

Determination of the relative abundance and distribution of bacteria and fungi in Bonny light crude oil-contaminated sandy loam soil

March 2013

  This study was undertaken to investigate the effects of Bonny light crude oil (specific gravity = 0.81; API gravity 43.20) on the numerical composition of soil bacteria and fungi and relative distribution of Gram positive and Gram negative soil bacteria. Eight different levels of the crude oil (0.5, 1.0, 2.0, 2.5, 5.0, 10.0, 15.0 or 20.0% v/w of soil) were used for the controlled pollution of soil samples...

Author(s):   Eze C. N., Ogbonna J. C., Anyanwu C. U. and Eze E. A.   

Impregnation of mosquito net with Neem seed (Azadirachta indica) oil and its insecticidal action

February 2013

  Malaria is a persistent health problem in Africa which requires multidimensional approaches to solve. Insecticide treated net has proved highly invaluable as one of the tools. Neem oil was extracted by solvent extraction in the present study and the oil was used to impregnate bednet. The result showed that the neem oil is a good mosquito repellant, in which its potential could be harnessed for further...

Author(s):   Adewole Adekanmi and Oderinde Abdulazeez        

Many exact solutions for nonlinear dynamics of DNA model using the generalized Riccati equation mapping method

February 2013

  The objective of this paper is to apply the generalized Riccati equation mapping method for constructing the exact traveling wave solutions of a nonlinear partial differential equation describing the dynamics of DNA modeling. This model consists of two long elastic homogeneous strands connected with each other by an elastic membrane. Hyperbolic and trigonometric function solutions of this model are obtained....

Author(s):   Elsayed M. E. Zayed and Ahmed. H. Arnous      

Endogenous ethanol production in the larva of oil palm weevil (Rhynchophorus palmarum, coleoptera; curculionidae)

February 2013

  This study investigated the larva of oil palm weevil for the presence of endogenous ethanol. The body tissue fluid of the larva was made and its alcoholic content determined using the specific gravity method. The alcohol content as percentage by volume was estimated from the laboratory alcoholometry. For comparison, the alcohol contents of lager beer and red wine were also estimated. Results showed that the...

Author(s):   Kemka H. Ogbonda and David B. Kiin-Kabari        

A new conditional invariant detection framework (CIDF)

February 2013

  Software engineering included some different process such as designing, implementing and modifying of software. All these processes are done to have fast developed software as well as reach a high quality, efficient and maintainable software. Invariants help programmer and tester to do most steps of software engineering more easily. Invariants are mostly always true but of course with a specific confidence....

Author(s):     Hamid Parvin, Hamid Alinejad Rokny, Sajad Parvin and Hossein Shirgahi        

Non linear analysis of a functionally graded beam with variable thickness

February 2013

  The nonlinear analysis of a functionally graded beam under combined loads is investigated analytically in this paper. The point loads and moment is applied at the end of the beam. The area section is considered to vary continuously along the longitudinal axis of the beam. The most important idea for presentation of this paper is the application of the present method for a vast class of functionally graded and...

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

Ergonomical evaluation of manually operated weeder under wet land condition

February 2013

  Drudgery involved in weeding operation increases stress on the worker causing increase in heart rate and oxygen consumption. Ergonomic evaluation of weeding operations by different age group of workers at different working hours showed that the heart rates corresponding to cono- weeder and Mandava weeder were 154.54 beats/min and 140.17 beats/min, respectively. Oxygen consumption rate was 1.76...

Author(s):   A. Ashok Kumar, B. Haribabu, A. Srinivasa Rao and Ch. Someswararao        

Land use changes of the Balcova-Guzelbahce shore line investigated using geographical information system (GIS) and remote sensing technique

February 2013

  This study investigated and determined land use changes resulting from economic pressure to develop the land which means development pressures, more specifically anthropogenic stresses, originate urbanization on agricultural land such as dam, swamp, highway, settlement and recreation area. The study, based on aerial photographs and satellite images, geographical information system (GIS) and remote sensing...

Author(s):   Handan Cakar⊃ and Bahar Turkyilmaz⊃        

Failure load of corner joints, which are reinforced with glass-fiber fabric in case-type furniture

February 2013

  In this study, the failure load of L-type corner joints, which are reinforced with glass-fiber fabric, of the case-type furniture have been analyzed experimentally and statistically in laminated medium-density fiberboard (LMDF) material. The failure loads of corner joints have been analyzed experimentally under compression and tension loads. Dowels (D), dowel + glass fiber composite layer from the outside...

Author(s):   Nurdan Cetin Yerlikaya      

Effect of irrigation and organic fertilization on oribatid mites (Acari, Oribatida) in forest nursery

February 2013

The aim of the paper was to determine the effect of microirrigation and organic fertilization on the structure of assemblages of oribatid mites in Silver birch and Scots pine cultivations under conditions of mulching with forest ectohumus. Investigations were conducted at Forest Nursery Białe Błota, Forest District in Bydgoszcz (Poland). Separate experiments in Scots pine and S. birch stands were established in 2003;...

Author(s): Andrzej Klimek, StanisÅ‚aw Rolbiecki, Roman Rolbiecki        

Tissue effects of high dose atropine and 2-PAM on healthy rats: Examining their role in complications during treatment of organophosphate poisoning

February 2013

  The aim of this study was to determine the effects of high dose atropine and pralidoxime (2-PAM) on different tissues, and to evaluate the drugs’ probable roles in complications during organophosphate (OP) treatment, without using pesticides on healthy tissues. This study was designed as a randomized controlled experimental study consisting of three groups of 10 rats (the control group, the atropine...

Author(s):   Betul Gulalp, Derya Gumuldulu, Aysun Uguz, Zikret Koseoglu, Gulsah Seydaoglu, Kenan DaÄŸlıoÄŸlu and Ozgur Karcioglu   .    

Detection and tracking of ships using a stereo vision system

February 2013

  Maritime transportation continues to maintain the largest volume in the transportation sector, and this is increasing day-by-day. This means there is an ever-increasing demand for safe navigation. In this study, we propose a stereo vision system for detecting and tracking ships as a tool for increasing navigational safety. Ships are detected from obtained images by using an edge detection algorithm that uses...

Author(s):   Gazi Kocak, Shigehiro Yamamoto and Takeshi Hashimoto        

Effect of varied soil matric potentials on the zinc use efficiency of soybean genotypes (Glycine Max L.) under the calcareous soil

February 2013

  Lime content of soils is one of the most important factors limiting zinc (Zn) availability to crops. It is also known that there may be a close relationship between soil moisture levels and Zn use efficiency of plant species. Thus, further studies would be needed concerning these relationships under the varied soils. In this study, a pot experiment was conducted using calcareous soil by growing different...

Author(s):   M. RüÅŸtü Karaman, Ayhan Horuz, Ekrem TuÅŸat, Aydın AdiloÄŸlu and Fatih Er        

What factors influence the adoption of inorganic fertilizer by maize farmers? A case of Kakamega District, Western Kenya

February 2013

  This study identifies the factors that influence adoption of inorganic fertilizers by maize farmers in Kakamega District. A probit model was used to analyze data collected from 169 maize farmers. The results showed that growing of a cash crop, off-farm income, access to an agricultural extension agent and use of improved maize seed positively and significantly influenced adoption of inorganic fertilizer....

Author(s): Elizabeth Nambiro and Peter Okoth        

Transportation optimization model of oil products

February 2013

Transporting massive amounts of oil products, it is essential to optimize the total efforts from leaving origins (refineries) until reaching destinations (depots). In this paper, integer mathematical programming model were developed to satisfy this oil transportation optimization problem. Specifically, it is dedicated to obtain refineries -to-depots optimal assignments by setting distance and cost minimization as the...

Author(s): Waleed K. Abduljabbar      

Classical and Bayesian estimation of parameters on the generalized exponentiated gamma distribution

February 2013

  In this paper, we offer generalized exponentiated gamma distribution. We consider the maximum likelihood and Bayesian estimators of unknown parameters and propose Markov chain Monte Carlo (MCMC) method to generate samples from the posterior distribution. The mean square error of estimations is computed and comparisons are made using Monte Carlo simulation.   Key words: Maximum...

Author(s):   Parviz Nasiri, Rasoul Lotfi and Hossein Veisipour        

Sexual orientation and the Nigerian society

February 2013

  The Alma-Ata declaration of the World Health Organization, written over three decades ago, clearly charted a new course for the health system of many countries. The historic meeting was the official launching of primary health care, whose principles are explicit equity, appropriate technology, integrated services, community participation and intersectoral collaboration. Nigerian had had her health system...

Author(s): Oluwafolahan Sholeye and O.T. Kuponiyi        

Ring characteristics of 95-year old Japanese cedar plantation trees grown in Taiwan

February 2013

  The ring characteristics of 95 year old Japanese cedar plantation trees grown in Taiwan were explored. Significant differences in the average ring width (RW), earlywood width, latewood width, ring density (RD), earlywood density, latewood density, highest density, lowest density, and latewood percentage were observed among three tree diameter classes and three radial stages of ring numbers. The RW parameters...

Author(s):   Cheng-Jung Lin and Far-Ching Lin        

Hyers-Ulam stability of non-homogeneous Euler equations of third and fourth order

February 2013

  The aim of this paper is to prove the stability in the sense of Hyers-Ulam to non-homogeneous Euler equations of third and fourth order: and. It is shown that if fis an approximate solution of any of these equations, then there exists an exact solution of the equation considered near to f.   Key words:  Hyers-Ulam stability, Euler equation, third and fourth order.

Author(s): Cemil Tunç and Emel Biçer        

Hematological assessments of sericin-derived oligopeptides in BALB/c mice

January 2013

Sericin, a protein removed from the silk cocoons, possesses various biological activities. Due to less solubility, utilization of the sericin protein may be limited. Enzymatic hydrolysates of this protein would thus, provide an alternative. Since safety assessment is required before any protein hydrolysates being used, the effects of sericin-derived oligopeptides (SP) on some hematological parameters were evaluated....

Author(s): Sirirat Bunarsa, Porkaew Promphet, Manote Sutheerawattananonda and Duangkamol Kunthalert

The influence of Didecyldimethylammonium Chloride on the morphology and elemental composition of Staphylococcus aureus as determined by NanoSAM

January 2013

Didecyldimethylammonium chloride (DDAC) is a Quaternary Ammonium Compound (QAC) disinfectant often used in the poultry industry to disinfect hard surfaces. DDAC is a membrane active agent and causes the leakage of important intracellular material. Understanding the mode of action and possible resistance is important; in particular, the pending post antibiotic era that the poultry industry is facing. Staphylococcus...

Author(s): Arina C. Jansen, Charlotte E. Boucher, Elizabeth Coetsee, Johan L. F. Kock, Pieter W. J. van Wyk, Hendrik C. Swart and Robert R. Bragg

Edge detection via statistical features and automatic thresholding technique

January 2013

In this paper, the problem of edge detection is addressed using the first order statistics and automatic thresholding technique. The general idea of edge detection using the simple edge detectors such as gradient operators or second derivative operators is extended to the statistic domain. The statistical features are used to describe the relationship between the current pixel and its neighboring, then, the thresholding...

Author(s): Salim Ben Chaabane, Mounir Sayadi and Farhat Fnaiech

Finite element simulation of non- linear deformation behaviour in large diameter angular contact thrust bearing

January 2013

The objective of the present study is to obtain relevant contact stiffness for a single ball-raceway contact which can be used in load distribution analysis of full bearing. Towards this, an elastic constitutive model is used in the 3D finite element analysis of load deformation characteristic of large diameter bearing ball - raceway contact and the finite element results are validated by conducting experiment on the...

Author(s): M. S. Starvin, S. Babu, Sriramachandra Aithal, K. Manisekar and P. Chellapandi

Seepage evaluation of an earth dam using Group Method of Data Handling (GMDH) type neural network: A case study

January 2013

The seepage critical impact and significant destructive nature during and after construction of earth dams have been increasingly important topics during the past decades. In this paper, a new approach is presented for determination of seepage induced flow under and through an earth dam based on Group Method of Data Handling (GMDH) algorithm. After careful (detailed) studying of an earth dam called Fileh Khase dam...

Author(s): Saeed Poorkarimi Kokaneh, Shahram Maghsoodian, Hossein MolaAbasi and Afshin Kordnaeij

Alteration of lymphocyte subpopulations in mice fed lutein from marigold extract

January 2013

Lutein, a member of the xanthophyll carotenoids, has a wide variety of health benefits. These include prevention of age-related macular degeneration or cataracts and protection of ultraviolet -induced skin damage. Lutein also possesses anti-tumor and immune modulatory activities in BALB/c mice.  However, in such animal model, the effects of lutein on lymphocyte subpopulations have not yet been assessed...

Author(s): Porkaew Promphet, Sirirat Bunarsa, Manote Sutheerawattananonda, Anupan Kongbangkerd and Duangkamol Kunthalert

Induction of cholangiocarcinoma cells apoptosis by an andrographolide analog

January 2013

Cholangiocarcinoma (CCA) is a malignant tumor derived from bile duct epithelial cells that has high incidence in the Northeastern area of Thailand. It is associated with the infection of liver fluke (Opisthorchis viverrini). Chemotherapeutic treatment of CCA is often ineffective due to its resistance to drugs. Therefore, new effective agents for treatment of CCA are urgently required. RSPP 050 analog is a modified...

Author(s): Narumol Bhummaphan, Jintapat Nateewattana, Kanoknetr Suksen, Rungnapha Saeeng, and Arthit Chairoungdua,

Preparation of nanocrystalline strontium titanate (SrTiO3) powder by sol-gel combustion method

January 2013

Nanocrystalline strontium titanate (SrTiO3, ST) powders were prepared by sol-gel combustion method. The influence of fuel content ratio (ratio of citric acid (CA) and total metal nitrate (MN); Ra = CA:MN) and calcination temperature were investigated on the structure, morphology, and crystallite size by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the Ra ratio of 3:1 is...

Author(s): Thanawat Klaytae, Piram Panthong and Sarawut Thountom,

Natural partial order on a semi group of self-E-preserving transformations

January 2013

Let T(X) denote the full transformation semigroup on a set X. For an arbitrary equivalence relation E on X, we consider a sub semi-group of T(X) defined by: TSE(X)={α∈T(X):(x,xα)∈E for each x∈X} which is called the self-E-preserving transformation semi-group on X. In this paper, we discussed a natural partial order on TSE (X) and...

Author(s): Chaiwat Namnak and Ekkachai Laysirikul

Riboflavin production by Candida tropicalis isolated from seawater

January 2013

Screening of Candida spp. capable of riboflavin production from seawater samples in Chonburi province was conducted. Total of 47 isolates were identified asCandida tropicalis and Candida krusei with similar percentages of distribution. Among those identified isolates, only two of C. tropicalis, MICBUU002 and MICBUU019, were found to be able to produce riboflavin with...

Author(s): Patcharanan Amornrattanapan

Nanometer complexes from explosives

January 2013

Lithium manganese oxides are of great interest as cathode materials for lithium-ion batteries. We describe here a new combustion method to synthesize lithium manganese oxides directly from lithium nitrate, manganese nitrate, ammonium nitrate and glycol. The resultant LiMn2O4 synthesized under the optimum synthesis conditions shows perfect spinel structure and uniform particle size distribution. The combustion...

Author(s): Huisheng Zhou and Xinghua Xie

Gillnet selectivity, seasonal, tidal and photoperiod variation in catch in the lower Nun River, Niger Delta, Nigeria

January 2013

The fish species of the lower Nun River was sampled to determine gillnet selectivity and the effect of season, tide and photoperiod variation on the catch. A total of 11,156 specimens were caught belonging to 14 families consisting of 25 species. Gillnet selectivity was observed with a declining trend from the largest mesh size net of 15 mm (58%) in number and 59% by weight, 12 mm (33%) in number and 33% by weight with...

Author(s): Martin E. Allison and Daniel Okadi

Physico-chemical quality of some commonly consumed stimulants and spices in Nigeria

January 2013

Commonly consumed parts of Tetracarpidium conophorium, Garcinia kola, Cola acuminata, Cola nitida and Afromomum melengueta were investigated for their trace metals, pH, conductivity and total dissolved solid values. Trace metal levels ranged between 42.24 ± 6.23 to 541.51 ± 189.37 µg/g Co and 36500.23 ± 367.01 to 115280.25 ± 397.33 µg/g K....

Author(s): John Adekunle Oyedele Oyekunle, Aderemi Okunola Ogunfowokan, Abolanle Saheed Adekunle, Michael Sola Akanni, Winston Doherty and Damilola Olusanya Abraham

Influence of cross section shape of the coil turns on the induction heating process

January 2013

Different common shapes of the RF-coil turns in induction heating systems were considered and corresponding results of electromagnetic fields, eddy currents and volumetric heat generation have been computed using a 2D finite element method. For calculations, rectangular (symmetric, asymmetric and shielded), circular, D-shape and -shape have been considered for the cross section of the coil turns. The obtained...

Author(s): Mohammmad Hossein Tavakoli, Mohtaram Honarmandnia and Hamed Heydari

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