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Articles by M. Hosseini
Total Records ( 6 ) for M. Hosseini
  Aidy Ali , M. Hosseini and B. B. Sahari
  Problem statement: This study reviewed the needs of different constitutive models for rubber like material undergone large elastic deformation. The constitutive models are widely used in Finite Element Analysis (FEA) packages for rubber components. Most of the starting point for modeling of various kinds of elastomer is a strain energy function. In order to define the hyperelastic material behavior, stress-strain response is required to determine material parameters in the strain energy potential and also proper selection of rubber elastic material model is the first attention. Conclusion: This review provided a sound basis decision to engineers and manufactures to choose the right model from several constitutive models based on strain energy potential for incompressible and isotropic materials.
  T. Allahyari , G. Nasl Saraji , J. Adl , M. Hosseini , M. Younesian and M. Iravani
  This study investigated the relationship between Useful Field of View and simulator-driving performance measures. Ninety professional drivers, aged 22-65 years from several government organizations voluntarily participated at this study. Useful Field of View was measured by a computerized task was developed at the present study. The participants then performed a driving simulator task and experienced a scenario that could lead to an accident. Reaction time and speed were measured and recorded by simulator and general driving performance and collision events were recorded by examiner. The reduction of Useful Field of View based on subjec´ s error score on Useful Field of View subtests between young and old group statistically was analyzed. Correlation analyses used to examine the relationship among the Useful Field of View as an independent variable and driving performance measures as a dependent variables. A univariate logistic regression analysis was used to determine the extent to which reduction of Useful Field of View predicts risk of accident in simulated car driving. There was a significant and negative correlation between Useful Field of View and simulator performance, on the divided peripheral subtest (Correlation Coefficient=-0.28). Student’s t-tests revealed significant differences in peripheral scores of Useful Field of View subtests between accident involved and non-involved groups. The result of logistic regression indicated that 40% reduction of Useful Field of View, regardless of age, increased risk of accident involvement. Useful Field of View could be used to predict driving performance and risk of accident. The obtained result can help to identify a high risk driver which is useful to licensing authorities.
  M.F. Nezamabadi , A.S. Moghadam and M. Hosseini
  A compendium of field observations in recent years in near field as Northridge (1994), Kobe (1995), Turkish (1995), Athens (1999), Bam (2003) and past analytical investigations have shown that the vertical component have significant effect in creating seismic damage. Also assessment of structural performances during past earthquakes demonstrates that plan irregularity, due to asymmetric distribution of mass, stiffness and strength, is one of the most frequent sources of severe damage. In this study the effects of vertical component of earthquake motion, acting simultaneously with horizontal component on the structures with asymmetric distribution of mass have been studied. A simple lumped-mass model of a single storey building resting on a rigid foundation with 4 degrees of freedom; the lateral displacement, the torsional displacement, the vertical displacement and the rotational displacement about lateral axis has been developed and displacement responses have been evaluated subjected to horizontal, torsional, vertical and rotational motions. The mass of diaphragm has been assumed to act at an eccentricity (e) from the center of resistance about x-axis and z-axis. It has been concluded that the influence of higher values of eccentricity ratio is to increase horizontal and vertical responses for smaller frequency ratio values. Increasing rate of vertical response due to eccentricity is reduced with decreasing frequency ratio values. Vertical response is very sensitive to the vertical frequency ratio values. For smaller vertical frequency ratio values, the response is much higher when the translational natural period of uncoupled building is greater than 1.2 sec.
  O. Azizpour and M. Hosseini
  This study focuses on how the interaction between piping and the supporting pipe-ways can affect the seismic behavior of the whole system. For this purpose, the considered pipe-way structures have been assumed to support multiple pipes so that the weight of the piping can be either about 25% of the pipe-way structure, or in some cases more and some cases less than that amount to evaluate how the ASCE code recommendation for analyzing the combination structures, such as piping and pipe-way, separately or as a whole system is valid. The effects of various combinations of different dimensions pipes, pipes end-conditions and stiffness of connecting links of on pipe-way piping on the system responses have been also discussed. Analytical results show that not only the weight percentage of piping, but also the stiffness of connection links and the dimensions of supported pipes and their end-conditions are also important factors affecting the whole system behavior and may cause the system conditions to be different from the code assumptions.
  M.T. Roudsari and M. Hosseini
  Several cases of failures in steel buried pipelines under the effect of wave propagation have been reported. Due to seismic waves propagations these pipelines will encounter various axial forces and bending moments which will consequently lead to the local buckling of the pipes and the reduction of the pipes hollow-sectional area. These effects cause overall reduction of efficiency of pipes. Due to the probabilistic nature of soil and earthquake specifications, a deterministic approach for analyzing buried pipeline networks against earthquake excitations is not appropriate. In this study an algorithm for reliability assessment of buried pipeline networks is proposed which is based on nonlinear dynamic analysis and calculation of reliability using Monte Carlo simulation. Due to complexity of numerical analyses of buried pipeline networks, there is no possibility of an explicit calculation for the performance limit state function, so a trained multilayer feed forward neural network was used as an alternative. For this purpose, the obtained results of many deterministic numerical analyses were used for training the neural network and the performance limit state function was replaced by trained neural network. Finally, based on the probability density function, standard deviation and average of probabilistic parameters, reliability of the pipeline network for different performance levels, was determined. By investigating a buried pipeline network in sandy soil as a case study, effectiveness of the proposed algorithm was investigated and by determining the importance measure of probabilistic parameters, sensitivity analysis was performed.
  A. Ghasemi , M.H. Shirazi , R. Ranjbar , M.R. Khorramizadeh , N.E. Daryani and M. Hosseini
  The aim of this study was to investigate the prevalence of cagA and cagE genes in H. pylori strains isolated from different patient groups with Non-Ulcer Dyspepsia (NUD), Duodenal Ulcer (DU), Gastric Ulcer (GU) and Gastric Cancer (GC). The patients admitted to the gastroenterology unit at Sharyati hospital in Tehran in 2006 were included in this study. Gastric biopsy specimens were obtained from the antrum of the stomach from each patient then cultured for detection of H. pylori. Identification of H. pylori was performed according to the standard bacteriological methods. Genomic DNA was extracted using a commercially available Qia gene kit. PCR was done using primers cagA-F, cagA-R and cagE-F, cagE-R to detect the target genes cagA and cagE, respectively. Amplified products of target genes were confirmed by sequencing. The cagA and cagE were detected among 85 and 86% of H. pylori isolates, respectively. Prevalence of cagA and cagE genes in the patients with NUD, DU, GU and GC were 22 (64.7%), 28 (100%), 18 (90%), 10 (100%) and 25 (73.5%), 27 (96.4%), 19 (95%), 7 (70%), respectively. The current study demonstrated a significant correlation between peptic ulceration and the presence of H. pylori isolates carrying cagE and cagA genes in Iranian patients.
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