Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2738

Table of Content: 23 February 2012; 7(7)

February 2012

Assessment of the vitality of the newborn: An overview

  Four million newborns die in the world every year, and reports indicate that 98% of those deaths occur in developing countries. The infant mortality rate in children under 5 years of age in Mexico has decreased progressively, in contrast to the neonatal mortality rate, where the reduction was not significant. For this reason, it is necessary and important to have resources that make it possible to assess,...

Author(s):   D. Mota-Rojas, D. Villanueva-García, R. Hernández-González,  P. Roldan-Santiago, R. Martínez-Rodríguez, P. Mora-Medina, B. González-Meneses, M. Sánchez-Hernández and M. E. Trujillo-Ortega    

February 2012

The effect of various chemical activators on pozzolanic reactivity: A review

  Pozzolans are being extensively used as a partial cement replacement in the production of Portland cement concrete. The advantages of using pozzolans are lower costs and better durability, however it requires longer setting time and the strength development at the initial age is slower. Different methods have been developed to overcome these disadvantages and to enhance the reactivity of natural pozzolans....

Author(s): A. Abdullah, M. S Jaafar, Y. H Taufiq-Yap, A. Alhozaimy and A. Al-Negheimish and J. Noorzaei,

February 2012

Development of a prototype hybrid-grid-based computing framework for accessing bioinformatics databases and resources

  Bioinformatics has already entered into its post genomic era, where research has advanced from data collection to data analysis using advanced computational and analytical tools. Due to current high demands on bioinformatics data, the various shortcomings in the computing infrastructure associated with the handling and processing of such biological data has constituted a great challenge. In this paper, effort...

Author(s):   Oluwagbemi, Olugbenga Oluseun      

February 2012

Survey on different factors influencing small-scale milking practices in a peri-urban area

  Managerial and financial abilities are amongst factors that contribute to profitability and survivability of small-scale farmers. Some rural and peri-urban areas have not adapted up to date milking techniques and hand milking is still the preferred method, especially for families that own one to six cows. Efficient milking techniques and impeccable hygiene standards are essential and the aim of the study was...

Author(s):   Jan Frederick Rykers Lues, Angeline Jacoby, Hanli De Beer, Elizabeth Kathie Jansen and Karabo Shale    

February 2012

A comparative study on conventional push-over analysis method and incremental dynamic analysis (IDA) approach

  The main objective of this paper is to evaluate the load-displacement capacity of steel moment-resisting frame structures using the conventional non-linear static analysis method and incremental dynamic analysis approach. Emphasis was put on the influence of different lateral load patterns on the plastic hinge of structural components and also on the seismic behavior of the structures which is influenced by...

Author(s):   Navideh Mahdavi, Hamid Reza Ahmadi and Hamed Mahdavi    

February 2012

Performance improvement of SAC-OCDMA system using modified double weight (MDW) code for optical access network

  In this paper, we have extensively analyzed the SAC-OCDMA system performance using Modified Double Weight (MDW) code with NAND detection technique as newly developed by the authors. In theoretical analysis, various noises and Multiple-Access Interference (MAI) effect were taken into account. The system performance was characterized by the signal-to-noise ratio (SNR) and the Bit-Error-Rate (BER). The analysis...

Author(s):   N. Ahmed, S. A. Aljunid, H. A. Fadil, R. B. Ahmad, M. A. Rashid    

February 2012

Use of diatomite in the production of lightweight building elements with cement as binder

  Diatomite is currently being used as raw material in various industrial sectors worldwide and is also in use in the construction industry, aimed at improving characteristics of concrete and cement, and in producing heat-insulating bricks, using various binders. In this study, usage of cement as a binder, in producing diatomite-based lightweight building elements, was investigated. Diatomite rocks...

Author(s):   Mehmedi Vehbi GÖKÇE and ─░lhan KOÇ    

February 2012

Effect of longitudinal stress levels on sliding wear

  In this study, sliding wear on specimen surfaces subjected to tensile loads was investigated. Specimens were loaded with four tensile loads that correspond to 0, 20, 40 and 60% of the specimens’ yield strength value, and then the resulting variations of wear rate with respect to sliding distance were investigated. In addition, a constant dead load of 60 N was exerted on the specimens and two...

Author(s):     H. Imrek, V. Firat and M. Bagci    

February 2012

Synthesis and characterization of grafted acrylonitrile on polystyrene modified with activated carbon using gamma-irradiation

  Acrylonitrile was successfully grafted on polystyrene modified with activated carbon using gamma-irradiation technique. This process was carried out modified at various gamma dose (0.2 to 1.5 Mrad). The new grafted polymer (GP) was characterized and its properties were investigated. In this study, it was found that 2 g of polystyrene, 90% (w/w) acrylonitrile monomer, 2% (w/w) ferrous...

Author(s):   Muhammed Mizher Radhi, Wee Tee Tan, Mohamad Zaki B. Ab Rahmanand Anuar Bin Kassim    

February 2012

Effect of water absorption on the wear behavior of sol-gel processed epoxy/silica hybrids

  The aim of this study is to investigate the wear behavior of epoxy-silica hybrids. These hybrids were obtained through the addition of sol-gel prepared silica nanoparticles to epoxy resin. In this study, the effect of nanosilica content on the mechanical properties and wear behavior of epoxy-silica hybrid materials was investigated. Tensile strength, impact strength, hardness, water absorption and wear tests...

Author(s):   Mustafa CAKIR, Ilyas KARTAL, Halil DEMIRER and Ramazan SAMUR    

February 2012

Random-valued impulse noise reduction in digital image using efficient nonparametric switching median filter

Visual information plays an important role in modern applications as the usage of multimedia becomes more widespread from day to day. However, impulse noise is ubiquitous in real life and often distorts an image. This paper presents a new noise-filtering algorithm called efficient nonparametric switching median (ENPSM) filter, which is capable of reducing the effect of low level random-valued impulse noise up to 30% of...

Author(s):   Mohd Helmi Suid and Nor Ashidi Mat Isa    

February 2012

Pareto analysis of on-site productivity constraints and improvement techniques in construction industry

  Productivity represents efficient and effective utilisation of scarce resources to achieve set objectives. Based on Pareto principle, this study aims to identify the nature of and improvement measures for the 20% of the factors causing 80% of the on-site productivity problems in the New Zealand construction industry. Qualitative data collected using pilot interviews formed the basis for questionnaire surveys...

Author(s):   Serdar Durdyev and Syuhaida Ismail  

February 2012

Sustainability and water transmission system in the Bagh-Shahr of Isfahan

  In this paper, firstly, we seek to explain the urbanization and sustainability principles in the Isfahan and compare them, present overlaps of the sustainable designing principles and the urbanization principles. However, it describes the role of the natural and garden-building elements based on the historical references in the Isfahan and the ways to change a city located in a hot and dry climate to a...

Author(s):   Atefeh Dehghan Touran-Poshti, Abbas Ali Tayefi Nasrabadi and Mohammad Naghizadeh    

February 2012

Sustainability and water transmission system in the Bagh-Shahr of Isfahan

  In this paper, firstly, we seek to explain the urbanization and sustainability principles in the Isfahan and compare them, present overlaps of the sustainable designing principles and the urbanization principles. However, it describes the role of the natural and garden-building elements based on the historical references in the Isfahan and the ways to change a city located in a hot and dry climate to a...

Author(s):   Atefeh Dehghan Touran-Poshti, Abbas Ali Tayefi Nasrabadi and Mohammad Naghizadeh