Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2753

Table of Content: April 2009; 4(4)

April 2009

Chromatographic analysis of vegetable oils: A review

  Vegetable oils has become more attractive recently because of its economical benefits as they are used as components in many manufactured products and the fact that it is made from renewable resources. The determination of the minor components is of great importance in establishing the oil quality and their genuineness. The qualitative and quantitative determination of the constituents is done by gas...

Author(s): Aluyor, E. O., Ozigagu, C. E., Oboh, O. I. and Aluyor, P.

April 2009

Plasmid-mediated antibiotic resistance in Staphylococcus aureus from patients and non patients

  Out of 156 samples collected from non-patients, nose and ear, 32% were found to harbor Staphylococcus aureus. Also 26 hospitals strains of S. aureus were isolated from clinical specimens. 62% of the total isolates including the clinical isolates were found to be multiple resistant, being resistant to 4 or more types of antibiotics. Resistance to methicillin and co-trimoxazole were the highest...

Author(s): Daini O. A. and Akano S. A.

April 2009

Antibacterial activity of oleo-gum resins of Commiphora molmol and Boswellia papyrifera against methicillin resistant Staphylococcus aureus (MRSA)

  The petroleum ether, ethyl acetate, methanol and water extracts of the oleo-gum resins of two Arabian medicinal plants, Commiphora molmol Engl. ex Tschirch andBoswellia papyrifera Hochst were investigated for their antibacterial activity against methicillin resistant Staphylococcus aureus (MRSA). The phytochemical investigation demonstrated the presence of phenolic compounds,...

Author(s): Emad M. Abdallah, Amna S. Khalid and Nazlina Ibrahim

April 2009

Comparison of parasitic helminthes infection between the sexes of Clarias gariepinus from Asa dam Ilorin, north-central Nigeria

  One hundred and sixty (160) specimens of catfish Clarias gariepinus were examined for parasites. They comprise eighty (80) specimens each of males and females. 21(26.25%) males and 21(26.25%) females showed parasitic infection. A total of eighty six (86) intestinal helminthes belonging to three taxonomic groups were recovered. They are cestodes - Amonotaenia sp, Polyonchobothrium clarias;...

Author(s):   O. I. Ayanda

April 2009

Application of analytical hierarchy process in the design concept selection of automotive composite bumper beam during the conceptual design stage

  Selection of design concepts is an area of design research that has been under considerable interest over the years. The level of success of product designs achieved depends significantly on the initial concept at the conceptual design stage. Inappropriate decision making during design concepts selection at the conceptual design stage can cause the product to be redesigned or remanufactured. To overcome such...

Author(s): A. Hambali, S. M. Sapuan, N. Ismail and Y. Nukman

April 2009

Recurrent artificial neural network based islanding protection by using generator speed deviation

  This paper presents a new islanding detection algorithm for distributed generation. The method contains a multi-layer feed forward artificial neural network structure with tapped time delays and a feedback from output which is generally called Recurrent Neural Networks (RNN) for short-term memory. The inputs of the proposed structure are generator speed deviations with a window of 60 ms time interval. The...

Author(s): Mehmet Bayrak

April 2009

Evaluating spatial variability and scale effects on hydrologic processes in a midsize river basin

  The impact of spatial variability and scale on the dynamics of hydrologic processes in the Monongahela river basin of USA was investigated using a physically based spatially distributed hydrologic model developed by Yildiz (2001). The hydrologic model simulations were performed at 1 and 5 km spatial scales for a 5 month period from April through August of 1993. Effects of spatial variability in topography,...

Author(s):   Osman Yıldız and Ana P. Barros

April 2009

Effects of curvature on free vibration characteristics of laminated composite cylindrical shallow shells

  This paper presents effects of curvature on free vibration characteristics of cross-ply laminated composite cylindrical shallow shells. Shallow shells have been considered for different lamination thickness, radius of curvature and elasticity ratio. First, kinematic relations of strains and deformation have been shown. Then, using Hamilton’s principle, governing differential equations have been obtained...

Author(s):   Ali Dogan and H. Murat Arslan  

April 2009

Adaptive trajectory control and friction compensation of a flexible-link robot

  An adaptive trajectory-tracking controller is developed for a single flexible-link manipulator with presence of friction in the joint and parametric uncertainties. The distributed-parameter dynamic modeling approach is used to design the controller. To eliminate large steady-state tracking error, an adaptive friction compensation technique is proposed based on general static friction model. Reduction of...

Author(s): Vahid Erfanian and Mansour Kabganian

April 2009

Assessing temporal and spatial characteristics of droughts in the Hirfanli dam basin, Turkey

  Regional drought analysis provides useful information for a sustainable water resources management. The characteristics of meteorological droughts in the Hirfanlı Dam Basin, a semi-arid region in Turkey were determined using the Standardized Precipitation Index (SPI) as a measure for drought severity. The region covers upstream drainage areas of the Kızılırmak River, one of the major water resources of...

Author(s): Osman Yıldız

April 2009

Prediction of bond strength of lightweight concretes by using artificial neural networks

  In the scope of this study, concrete samples planned to be used as load-bearing concrete were produced by using pumice aggregate and silica fume. Cement was replaced by silica fume, as the mineral additive, by 5 and 10% of its weight. First of all, fresh concrete properties of the produced samples were evaluated. Then, compressive strength tests were conducted on the 28th and 90th days. In addition,...

Author(s): Emre Sancak

April 2009

Investigation of mechanical properties of concrete produced with waste granites aggregates

  The purpose of this study is to determine the mechanical properties of waste block granites as crushed stone aggregates for concrete production. The granite aggregates were obtained from granite pits around the Kaman town of KırÅŸehir province in Turkey. The aggregates were tested in terms of density, water absorption, compressive strength, splitting tensile strength, and static modulus of elasticity with...

Author(s): Ä°lhami Demir

April 2009

The effects of using fly ash on high strength lightweight concrete produced with expanded clay aggregate

  In this study, the effect of using fly ash in high strength lightweight aggregate concrete produced with expanded clay aggregate on physical and mechanical properties of the concrete was investigated. For this purpose, lightweight concrete mixtures with 350, 400 and 450 kg/m³ cement content were prepared using expanded clay aggregate. Besides, concretes with 0, 10, 20 and 30% fly ash replacement...

Author(s): Serkan SubaÅŸi

April 2009

Prediction of mechanical properties of cement containing class C fly ash by using artificial neural network and regression technique

  The aim of this study is to investigate the estimation ability of the effects of utilizing different amount of the class C fly ash on the mechanical properties of cement using artificial neural network and regression methods. For this reason, 0, 5, 10, 15 and 20% amount of the class C fly ash were substituted with cement and 40 x 40 x 160 mm dimension specimens were prepared. On the prepared specimens unit...

Author(s): Serkan Subaşı

April 2009

Post-market in vitro bioequivalence study of six brands of ciprofloxacin tablets/caplets in Jos, Nigeria

  Six brands of ciprofloxacin 500 mg tablets have been evaluated using some quality control tests of uniformity of weight, hardness, friability, assay, disintegration and dissolution with the aim to assess its bioequivalence. The results obtained have been discussed in some details using monographs in the two Pharmacopeia (United States Pharmacopeia, USP and British Pharmacopeia, BP). The results were also...

Author(s): N. C. Ngwuluka, K. Lawal, P. O. Olorunfemi and N. A. Ochekpe

April 2009

Production of polyclonal antibodies to various strains of Rice Yellow Mottle Virus (RYMV) obtained across different agro-ecological zones in West Africa

  High titer polyclonal antibodies for serological diagnostic purposes were locally produced to forty isolates of rice yellow mottle virus (RYMV) collected from  different  sites across four West African countries (18- from Cote d’Ivoire, 2- from Burkina Faso, 5- from Mali and 15- from Niger Republic). This was achieved by immunizing rabbits with purified viral preparations. The primary goal was...

Author(s): Abolade S. Afolabi, S. K. Akator, E. M. Abo, Amos Onasanya and Yacouba Séré

April 2009

Effect of cassava effluent on Okada denizens

  A study was designed to investigate the effect of cassava effluent on Okada environment. Two sets of same five plant species were germinated and watered with cassava effluent for 10 days at alternate days. One part of the effluent had read palm oil in it from processing while a part of it had non. Significant results were obtained from the one without red palm oil. Only Chlomolaena odoratasurvived out of...

Author(s): J. E. Ehiagbonare, S. A. Enabulele, B. B. Babatunde and R. Adjarhore

April 2009

Assessment of groundwater quality in unconsolidated sedimentary coastal aquifer in Lagos State, Nigeria

  This study assesses the quality of ground water from nine different borehole locations in Lagos State, Nigeria. Borehole water samples were carefully collectedfor physico – chemical analyses. Calcium, magnesium, iron, zinc, copper,manganese, aluminium, and silver, Nitrate, phosphate, fluoride,  chloride, pH, conductivity, total dissolved solid, total suspended solid,...

Author(s): Adebo B. A, and Adetoyinbo A. A.

April 2009

Mesterolone (Proviron) induces low sperm quality with reduction in sex hormone profile in adult male Sprague Dawley rats testis

  Anabolic-androgenic steroid compounds are one of the most widely abused drugs by athletes and muscle builders with the goal of improving performance/muscle mass. However, increasing concern has been expressed because these compounds not only offer unappreciable benefits to infertile and subfertile males, but also might have deleterious effects on both human and animal physiology including sperm quality. In...

Author(s): Shittu Lukeman A. J., Shittu Remilekun K., Osinubi Abraham A. A. and Tayo Adetokunbo A.

April 2009

Non-planar coupled shear walls with stiffening beams

  This paper concerns itself with the static analysis of non-planar coupled shear walls with any number of stiffening beams. Furthermore, the change of the heights of the stories and connecting beams from region to region along the height are taken into consideration. The stiffening of coupled shear walls is realized by placing high connecting beams at the levels of whole or partial stories used as storage or...

Author(s): E. Emsen, C. D. Turkozer, O. Aksogan, R. Resatoglu and M. Bikçe