Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2732

Table of Content: 30 December, 2011; 6(34)

December 2011

Global stability of an HIV/AIDS model with infection age and impulsive persuasion rate

In this paper, an impulsive persuasion strategy to eradicate HIV/AIDS is studied. Since infection age is an important factor of HIV progression, we incorporate the infection age into the model. Using integral equation theory and operator semi group theory, we analyze the dynamical behaviors of this model and point out that there exists an infection-free periodic solution which is globally asymptotically stable if ....

Author(s): Xiaoyan Wang, Junyuan Yang, and Xuezhi Li

December 2011

An IMM algorithm based on augmented kalman filter for maneuvering target tracking

In this paper, in order to increase the accuracy of interacting multiple model (IMM) algorithm in presence of low and medium maneuvers, a new IMM algorithm based on Augmented Kalman Filter (AUKF) has been proposed. The accuracy of the IMM algorithm depends upon having a set of filters with motion models which are similar at all times to the real target situations. One way to increase the accuracy of this estimator is to...

Author(s): Ahmadreza Amirzadeh, Ali Karimpour and Ali Moeini

December 2011

Crack damage detection of reinforced concrete beams using local stiffness indicator

This paper described the application of the generalized solution for transverse vibration to detect crack damages in reinforced concrete beams. A single crack was induced in a full-scale reinforced concrete beam by application of a point load. The load was increased in stages to obtain different crack heights to represent the extent and severity of the defect. Experimental modal analysis was performed on the beam prior...

Author(s): Ismail Z., Ong A. Z. C. and Rahman A. G. A.

December 2011

Intrusion detection using feature subset selection based on MLP

Intrusions are serious questions in network systems. Numerous intrusion detection techniques are present to tackle these problems but the dilemma is performance. To raise performance, it is momentous to raise the detection rates and decrease false alarm rates. The contemporary methods use Principal Component Analysis (PCA) to project features space to principal feature space and choose features corresponding to the...

Author(s): Iftikhar Ahmad, Azween Abdullah, Abdullah Alghamdi, Khalid Alnfajanand Muhammad Hussain

December 2011

Vibrations of elastically restrained rectangular plates

In this study, an approximation method based on Fourier sine series were investigated for the vibration analysis of rectangular plates elastically restrained along all the edges. The transverse displacement of the elastic supported plate consisted of linear combination of Fourier sine series and an auxiliary polynomial function. In order to eliminate possible discontinuities; an auxiliary polynomial was used in Fourier...

Author(s): Hüseyin DAL and Ömer K. MORGÜL

December 2011

Comparison of the supercritical fluid extraction with conventional extraction methods to determine the fatty acid composition of black cumin seeds

The purpose of this study was to compare different methods of extraction to determine the fatty acid composition of black cumin seeds. 100 g of the powdered sample either was subjected into SFE equipment using standard procedures or extracted using conventional techniques (methanol or hexane solvents). Identification of fatty acid composition of extracted Nigella sativa oil was performed by...

Author(s): Saadat Parhizkar, Latiffah A Latiff, and Sabariah Abd Rahman,

December 2011

On using tabu search for fuzzy clustering analysis

Clustering is an important technique for discovering the inherent structure in a given data set without any ‘priori’ knowledge. Fuzzy clustering analysis is to assign objects to a given number of clusters with respect to some criteria such that each object may belong to more than one cluster with different degrees of membership. In this article, a new fuzzy clustering method based on tabu search called...

Author(s): Yongguo Liu,, Xindong Wu and Yidong Shen

December 2011

In vivo and in vitro antibacterial activity of neomycin against plant pathogenic bacteria

The purpose of this study was to evaluate the potential of neomycin to suppress the development of economically important plant pathogenic bacteria. The in vitroantibacterial activity against Xanthomonas campestris pv. citri, Erwinia carotovorasubsp. carotovora, Xanthomonas oryzae pv. oryzae and Ralstonia solanacearum was evaluated. The minimal...

Author(s): Ke Tao, Jieyu Fan, Guanying Shi, Xingang Zhang, Haoyu Zhao and Taiping Hou

December 2011

Proximate composition of the leaves of Bambusa ventricosa, Oxytenanthera abyssinica and two varieties of Bambusa vulgaris

Food selection by herbivores depends on the dietary composition of plant parts. However, the nutritional properties of tropical bamboo leaves, which could be a viable supplement of traditional fodder are hardly examined. Proximate composition of Bambusa ventricosa McClure, Oxytenanthera abyssinica (A. Rich.) Munro and two varieties of Bambusa vulgaris (B. vulgaris Schrad. ex J. C....

Author(s): C. Antwi-Boasiako, G. Y. Coffie and N. A. Darkwa

December 2011

The antioxidant and tyrosinase inhibitory activities of some essential oils obtained from aromatic plants grown and used in Yemen

The antioxidant and skin whitening properties of essential oils as natural products is the cornerstone to replace synthesized preservatives and to obtain safer source with better biological activities. The present study was designed to investigate the antioxidant and tyrosinase inhibitory activities of twenty essential oils obtained from aromatic plants grown and used in Yemen. Essential oils were hydrodistilled using...

Author(s): Mohammed Al-Mamary, Siddig Ibrahim Abdelwahab, Sayeed Al-Ghalibiand Eftekhar Al-Ghasani

December 2011

Determination of the best indirect selection criteria for improvement of seed and oil yield in canola cultivars (Brassica napus L.)

To evaluate the relationship among seed and oil yield as well as determine the best indirect selection criteria for genetic improvement of seed and oil yield in canola a randomized complete block design with three replications was conducted using 17 cultivars. Step-wise regression of seed and oil yield revealed that 98.4 and 98.9% of total variation exists in these traits accounted for by the traits seed yield, oil...

Author(s): Ahmad Reza Golparvar

December 2011

Coefficient of variation and its application to strength prediction of self-piercing riveted joints

This study deals with an application of the method of the coefficient of variation in strength prediction of the self-piercing riveted joints. Defined as the ratio of the standard deviation to the mean, the coefficient of variation may be used in both the reliability-based design of self-piercing riveted joints and in the evaluation of existing products. In this study, the concept and definition of the coefficient of...

Author(s): Xiaocong He