Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2746

Table of Content: 30 November 2011; 6(29)

November 2011

Satisfaction of AIDS orphans about orphan care and support programme

  It is a well known fact that Botswana has one of the world’s highest HIV-prevalence rates as well as, the world’s highest percentage of orphaned children living among its population. In response to this challenge, Botswana instated the National orphan care support programme. However, since its inception in 1999, little has been done to evaluate its effectiveness. The objectives of the study were...

Author(s): Matshediso K. Mokgatle-Nthabu M. and Oguntibeju O. O.

November 2011

Prospects of beekeeping in the Northern Ethiopian highlands

  Ethiopia is one of the principal honey and beeswax producers in the world. An assessment was conducted to investigate the scope of beekeeping in Endrta district Northern Ethiopia in 2010. Ninety two beekeepers were randomly selected for semi structured interviews. Data on annual income, number and type of beehive owned, honey yield/hive, year of adoption of modern beehives and beekeeping experience were...

Author(s):   Mekonen Teferi, Gidey Yirga, Tewelde Hailemichael and Solomon Amare

November 2011

Soil liquefaction induced settlements with interaction of earthquake hazard analysis

  The Marmaray Rail Tube Tunnel and Commuter Rail Mass Transit System Project provides an upgrading of the commuter rail system in Istanbul connecting Halkali on the European side with Gebze on the Asian side with an uninterrupted, modern, high-capacity commuter rail system. Railway tracks in both sides of Istanbul Strait will be connected to each other through a railway tunnel connection under the Istanbul...

Author(s):   Zeynep Tugce YUKSEL, Ferhat OZCEP, Dilek KEPEKCI and Tazegul OZCEP

November 2011

Analyzing the protection system’s risk in distribution networks after connection of distributed generation (DG)

  Using distributed generation (DG) is an interesting topic that has drawn attention of electrical engineers in recent years. The presence of these generation units in distribution systems, although has many advantages and benefits, has to be applied after performing detailed studies and investigations due to their complexities in operation, control and protection of network. One of the major effects of DGs is...

Author(s):   S. A. M. Javadian and M. R. Haghifam

November 2011

Assessment of evaporation and salt accumulation in bare soil: Constant shallow water table depth with saline ground water

  Salinization of soil is a major problem in arid and semi-arid regions with saline shallow water table. This is influenced by climate, soil type, crop, irrigation water quality and management practice, depth of water table and salinity of the water table. The objective of this study was the assessment of evaporation and salinization of bare soil profile with various water table depths including 300, 500 and...

Author(s):   Jalili, S., Moazed, H., Boroomand Nasab, S. and Naseri, A. A.

November 2011

The effects of a chemically polluted environment on patients’ teeth in Pancevo, Serbia

  Modern urban areas have recently become increasingly polluted. Heavy metals are one group of industrial pollutants which have no biological functions and accumulate in various parts of human bodies. The principal hypothesis of this study was that the pollution of the environment by certain heavy metals, that is, lead, cadmium, nickel and mercury, caused long-lasting changes in teeth, through deposition in...

Author(s):   Cenic-Milosevic Desank, Mileusnic Ivan, Pejanovic Djordje, Ristic Tamara, Jakovljevic Ankica, Popovic Milica, Melih Irena and Kolak Veljko

November 2011

Obtaining soil stiffness using WAK test and numerical methods

  A study has been undertaken at musicale in the laboratory to simulate the densification of a sandy soil bed by dynamic compaction. This was achieved by allowing a tamper mass of 875 g to fall through 100 mm onto a stiff aluminium target having a mass of 268 g and a diameter of 100 mm. Since the frequencies generated by this process are very low, the dynamic stiffness derived approximately the static value...

Author(s):   Mansour Parvizi and Hossein Sharif  

November 2011

Proposed methodology to enhance C4I systems security on architectural level

  Command control, communication, computer and intelligence (C4I) systems are the back bone complex information and communication systems for modern information warfare (IW). Managing security in C4I systems is a challenge due to complexity and criticality of these systems. This paper elaborates design methodology to incorporate security in the C4I systems in systematic and consistent way instead of patching...

Author(s):   Abdullah Sharaf Alghamdi, Tazar Hussain, Gul Faraz Khan, Khalid Alnafjan and Abdul Haseeb

November 2011

Three body abrasive wear of X12CrNiMo martensitic stainless steel laser alloyed with TiC

  Martensitic stainless steels (MSSs) are often used for applications that require high wear resistance and hardness. A laser multi-track overlapping process was employed to fabricate TiC-reinforced metal matrix composite (MMC) coatings on X12CrNiMo steel substrate using a 4.4 kW continuous wave (CW) Nd: YAG laser. 50 and 75% overlap were produced. Comparative studies of the three-body abrasive wear...

Author(s):   A. P. I.  Popoola and D. I. Adebiyi

November 2011

Effects of layer arrangements on bending strength properties of laminated lumber made of poplar (Populus nigra L.)

  In this study, the effects of layer arrangements on bending properties of laminated wood products have been investigated. Poplar (Populus nigra L.) and polyvinyl acetate (PVA) were used as wood and adhesive, respectively. Bending static properties (MOE and MOR) of laminated products comprising various combinations of layer arrangements resulting in 5 combinations were measured. The results of this study...

Author(s):   Ali Bayatkashkoli, Mohammad Shamsian and Marjan Mansourfard

November 2011

Technical efficiency and meta-technology ratios of regional firms in Bangladesh: A stochastic meta-frontier model

  We examined the relative influence of preference of a stochastic metafrontier model to evaluate the technical efficiencies and meta-technology ratios of firms that may be classified into different regions but not have the same technology. The empirical application of the model used panel data set of six different regional firms in Bangladesh. We observed low mean technical efficiency scores 17.7%, 15.9, 13.4...

Author(s):   Kanis Fatama Ferdushi, Anton Abdulbasah Kamil, Md. Azizul Baten and Adli Mustafa

November 2011

In-vitro anti-bacterial activities of crude n-hexane extracts of Garcinia kola (Heckel) seeds against some Vibrio bacteria isolated from wastewater effluents

  Crude n-hexane extracts of the seed of Garcinia kola were screened for their in-vitro anti-Vibrio activities against 50 Vibrio bacteria isolated from wastewater final effluents in the Eastern Cape Province of South Africa. The extract at a screening concentration of 10 mg/ml resulted in zones of inhibition ranging from 10 to 14 mm against the susceptible isolates and the...

Author(s):   Okoh AI and Penduka D

November 2011

Analysis of possibility for traffic safety improvement based on Serbian traffic violation database analysis

  In order to improve traffic safety, both reactive and proactive approaches are used. Unlike the reactive, the proactive approach ’does not wait’ for traffic accidents to happen to start analysing traffic safety conditions. The proactive approach implies traffic safety improvement based on the analysis of so-called indirect traffic safety indicators, like the behaviuor of traffic participants, and...

Author(s):   Dalibor Pesic, Milan Vujanic, Krsto Lipovac and Boris Antic

November 2011

Investigation of flow and vacuum lifting force on a non-contact end effector for robotic handling of non-rigid material

  This study identifies the need for a new range of end effectors suitable for non-rigid products and introduces a novel non-contact gripping device. The end effector operates on the principle of generating a high-speed fluid flow between the end effector and product surface thereby creating a vacuum which levitates the product. The lifting forces and conditions are discussed by using optimization methodology...

Author(s):   Ethem Toklu and Fehmi Erzincanli

November 2011

Mobile data collector based routing protocol for wireless sensor networks

  In the era of New Generation Networks (NWGN) many emerging and future enable technologies accomplish the requirements of ubiquitous communication networks. Mobile wireless sensor network (mWSN) is one of the rising and emerging technologies for various application of NWGN, the enormous concerns of these networks are data gathering with energy efficiency. Routing protocol act as middleware, which is...

Author(s):   Muhammad Arshad, Nasrullah Armi, Nidal Kamel and N. M. Saad

November 2011

Impact of the new road traffic safety law on the number of traffic casualties in Serbia

  In this research the analysis of the impact of the new road traffic safety law (new RTSL) in Serbia to the decrease of the number of killed in traffic accidents in Serbia is shown. The effects of a new legislation and larger enforcement made by new RTSL implementation to the decrease of the number of killed and injured in traffic have been analysed by comparing the number of killed and injured in traffic in...

Author(s):   Boris Antić, T. E., Milan Vujanić, T. E., Dragan Jovanović, T. E. and Dalibor Pešić, T. E.

November 2011

Preparation, characterization and adsorption performance of the KOH-activated carbons derived from kenaf fiber for lead (II) removal from waste water

  In this study, activated carbon was prepared from kenaf fiber (KF) by using physiochemical activation method consisting of potassium hydroxide (KOH) impregnation with carbon dioxide (CO2) gasification. Pore structure and physical characteristics of the prepared activated carbon were determined. Adsorption studies for divalent lead (Pb) were carried out to delineate the effect of contact time,...

Author(s):   Zaira Zaman Chowdhury, Sharifuddin Mohd. Zain, Rashid Atta Khan and Muhammad Aqeel Ashraf

November 2011

A comparative study for electricity generation in microbial fuel cell reactor with and without mediators

A microbial fuel cell (MFC) reactor with two compartments has been constructed from cheap materials and used for electricity generation from artificial mineral glucose medium (MGM) and test the adding or not adding  the mediators during four separate experiment. The maximum voltages yield at external resistance 30 Ω on the mediator - less experiments was 401 mV, while when the mediators have been methylene...

Author(s): Al-Shehri, A. N., Ghanem, K. M., and Al-Garni, S. M.

November 2011

Flow injection spectrophotometric and spectrofluorimetric methods for the determination of candesartan cilexetil in pharmaceutical formulations

  This article describes the development of flow injection methods for the determination of Candesartan Cilexetil using spectrophotometery and spectrofluorimetry in pharmaceutical formulations. The first method is based on the UV absorption at 270 nm in phosphate buffer containing cetyl trimethylammonium bromide (CTAB) and methanol at pH 6.5. The second method based on the fluorescence excitation and...

Author(s):   Ayisha Khalid, Amir Waseem, Iftikhar Afzal, Mohammad Yaqoob, Abdul Nabi and Mohammad Masoom Yasinzai

November 2011

Co-integration analysis on all-variety Boro rice yields

  The Boro rice is one of the most important rice in Bangladesh. It has three varieties namely: high yielding, local and Pajam. The all-variety Boro rice yield of Rajshahi and Rangpur districts have been selected for the period from 1985 to 2007 to measure the relationship between them. Our study shows a cointegrating relationship exist between the yields. The speed of adjustment coefficient of the error...

Author(s):   Provash Kumar Karmokar, and Mahendran Shitan,  

November 2011

FPGA implementation of elliptic curve cryptography engine for personal communication systems

  Elliptic Curve Cryptography (ECC), which allows smaller key length as compared to conventional public key cryptosystems, has become a very attractive choice in wireless mobile communication technology and personal communication systems. Any cryptosystem requires a very quick computation in very short time to get an optimal efficiency. One of the options could be to implement the overall cryptosystem into FPGA...

Author(s):   Md. Syedul Amin, Md. Mamun and Jubayer Jalil

November 2011

The effect of semi-solid processing parameters on microstructure in Al-7wt.%Si alloy

  In the present work, the effect of temperature and pressing time on the microstructure of a Al-7wt.%Si alloy was studied. Al-Si specimens were prepared by pre-shaping powder obtained with mechanical processing from Al-7wt.%Si alloy produced with ingot metallurgy under 800 MPa pressure. The prepared specimens were subjected to semi-solid processing at 100 MPa pressure and at different temperatures (580, 590...

Author(s):   Dursun Özyürek

November 2011

A new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks

  Network deployment problem is one of the major issues when base stations and relay stations are jointly deployed. Deploying relay station at suitable position covers throughput enhancement and coverage extension problem in IEEE 802.16j MMR networks. In this paper we have proposed a new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks and studied about the...

Author(s):   D. Satish Kumar and N. Nagarajan

November 2011

Evaluation of bone mineral density in hyperprolactinemic patients treated with dopamine agonists

The purpose of this study is to evaluate the bone mineral density (BMD) of hyperprolactinemic women after at least one year treatment with dopamine agonists. A total of 24 patients and 24 healthy control women (mean age of 33 ± 8 and 33.8 ± 0.8 years, respectively, P = 0.74) were participated in this study. Measurement of fasting serum prolactin and estrogen level in the follicular phase was carried out...

Author(s): Hajieh Bibi Shahbazian, Karim Mowla and Sirous Zarei