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Search Results: 1 - 10 of 358 matches for " Behrooz Khaleghi Manesh "
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Risk Factors of First Acute Myocardial Infarction: Comparison of Elderly and Non-Elderly: A 24-Year Study  [PDF]
Soheila Dabiran, Behrooz Khaleghi Manesh, Farahnaz Khajehnasiri
Advances in Aging Research (AAR) , 2015, DOI: 10.4236/aar.2015.41002
Abstract: Although risk factors of Ischemic Heart Disease (IHD) are well known, knowledge about the distribution of these risk factors in different subgroups of patients can be used for designing preventive programs. The aim of this study was to assess differences of prevalence of IHD risk factors in elderly and non-elderly patients in their first Acute Myocardial Infarction (AMI). In this retros-pective study, elderly (age > 65; n = 1060) and non-elderly (age ≤ 65; n = 2228) patients with first AMI who were admitted into four teaching hospitals in Tehran between 1982 and 2005 were recruited. Risk factors containing male gender, systolic and diastolic hypertension (HTN), diabetes, hypertriglyceridemia, hypercholesterolemia, smoking and family history of IHD were compared between the two groups. Among different risk factors, diabetes and systolic HTN were more common in elderly than their non-elderly counterparts, and male gender, smoking, family history of IHD and dyslipidemia were more common in non-elderly patients than elderly ones (p < 0.05 for all comparison). Diastolic HTN showed no significant difference between the two groups. Findings of this study, stating difference of prevalence of risk factors in two elderly and non-elderly groups, can be used by health policy makers to conduct preventive programs for AMI in this country.
Analyzing Some Behavior of a Beam with Different Crack Positions Transversely inside It  [PDF]
Behrooz Yazdizadeh
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.51009
Abstract:

Vertical displacement, critical Euler buckling load and vibration behavior of a cracked beam are considered in this research. The crack inside the beam is placed in different positions and results compared for each crack position. On first Eigenvalue of free vibration results, there is a border that first Eigenvalue of free vibration does not change if center of crack is located on that border, and after that border, the first Eigenvalue of free vibration is increased that is a counterexample relation of critical Euler buckling load and first Eigenvalue of free vibration.

Diversity Techniques with Parallel Dipole Antennas: Radiation Pattern Analysis
Ali Khaleghi
PIER , 2006, DOI: 10.2528/PIER06062401
Abstract: Two parallel dipoles are assessed for antenna diversity. The three-dimensional radiation pattern is considered for signals correlation coefficient. The pattern analysis reveals that, depending on dipole spacing, three types of diversity techniques are generated: space, amplitude-pattern and phase-pattern diversity. The weighting of each technique in signals correlation coefficient mitigation is investigated. The results show that for closely spaced dipoles, the generated phasepattern diversity is the most dominant factor which greatly reduces the signals correlation coefficient. The diversity configuration is measured in a rich scattering environment. Results include signals correlation coefficient, diversity gain for selection combining and maximum ratio combining, effective diversity gain and antenna radiation efficiency can be demonstrated. We show that in rich multipath channel the minimum spatial distance, for effective diversity gain performance, is reduced from 0.5 for uncoupled dipoles to 0.15 for coupled dipoles.
A comparative study of variant turbulence modeling in the physical behaviors of diesel spray combustion
Amini Behnaz,Khaleghi Hasan
Thermal Science , 2011, DOI: 10.2298/tsci110823105a
Abstract: In this research, the performance of non-linear k-ε turbulence model in resolving the time delay between mean flow changes and its proportionate turbulent dissipation rate adjustment was investigated. For this purpose, the ability of Launder-Spalding linear, Suga non-linear, Yakhot RNG and Rietz modified RNG k-ε models are compared in the estimation of axial mean velocity profile and turbulent integral length scale evolution during engine compression stroke. Computed results showed that even though all the models can predict the acceptable results for velocity profile, for turbulent integral length scale curve, non-linear model is in a good agreement with modified RNG model prediction that depicts correspondence with experimental reported data, while other models show a different unrealistic behaviors. Also after combustion starts and piston is expanding, non-linear model can predicts actual manner for integral length scale while linear one cannot. It is concluded that, physical behavior of turbulence models characteristics should be ascertained before being successfully applied to simulate complex flow fields like internal combustion engines.
Multiple Change Point Estimation in Stationary Ergodic Time Series
Azadeh Khaleghi,Daniil Ryabko
Mathematics , 2012,
Abstract: Given a heterogeneous time-series sample, the objective is to find points in time (called change points) where the probability distribution generating the data has changed. The data are assumed to have been generated by arbitrary unknown stationary ergodic distributions. No modelling, independence or mixing assumptions are made. A novel, computationally efficient, nonparametric method is proposed, and is shown to be asymptotically consistent in this general framework. The theoretical results are complemented with experimental evaluations.
A consistent clustering-based approach to estimating the number of change-points in highly dependent time-series
Azaden Khaleghi,Daniil Ryabko
Computer Science , 2013,
Abstract: The problem of change-point estimation is considered under a general framework where the data are generated by unknown stationary ergodic process distributions. In this context, the consistent estimation of the number of change-points is provably impossible. However, it is shown that a consistent clustering method may be used to estimate the number of change points, under the additional constraint that the correct number of process distributions that generate the data is provided. This additional parameter has a natural interpretation in many real-world applications. An algorithm is proposed that estimates the number of change-points and locates the changes. The proposed algorithm is shown to be asymptotically consistent; its empirical evaluations are provided.
Numerical Solution of Nonlinear Integro-Differential Equations with Initial Conditions by Bernstein Operational Matrix of Derivative  [PDF]
Behrooz Basirat, Mohammad Amin Shahdadi
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2013, DOI: 10.4236/ijmnta.2013.22018
Abstract:

In this paper, we present a practical matrix method for solving nonlinear Volterra-Fredholm integro-differential equations under initial conditions in terms of Bernstein polynomials on the interval [0,1]. The nonlinear part is approximated in the form of matrices’ equations by operational matrices of Bernstein polynomials, and the differential part is approximated in the form of matrices’ equations by derivative operational matrix of Bernstein polynomials. Finally, the main equation is transformed into a nonlinear equations system, and the unknown of the main equation is then approximated. We also give some numerical examples to show the applicability of the operational matrices for solving nonlinear Volterra-Fredholm integro-differential equations (NVFIDEs).

Seed Germination and in Vitro Organogenesis Optimization of Zhumeria majdae (Lamiaceae) from Iran  [PDF]
Parisa Aghazadeh, Behrooz Shahsavan Behboodi
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611185
Abstract: Zhumeria majdae is a medicinal plant and endemic of Iran that is being threatened to extinction. The present investigation to preserve this relict species, was conducted to study of: 1) different treatments effect on seeds germination: a) in vivo, b) in vitro were subjected to 5 treatments, 2) callus induction and organogenesis from leaf, root and stem of explants by tissue culture on MS medium supplemented with 7 different concentration and combinations of auxin and cytokinin. Results indicated the germination rate were promoted by seeds mucilage, and were inhibited under cold condition. The best callus induction were observed from stem and leaf explants in the MS + B(IAA(0.1) + Kin(1) mg·L-10). The maximum leaf formation of leaf explants were produced in the MS + E(IAA(0.1) + BA(2) mg·L-10).
Estimate Erosion in Ladiz Dam in Sistan and Baluchistan with Use of Trace Minerals—South East Iran  [PDF]
Mohammad Reza Noura, Behrooz Sahebzadeh
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.61002
Abstract: A survey uses this new information: the statistical calculation and interpretation to determine the characteristics of sediments in the reservoir’s “Dodar Ladiz” dam. It is a useful and efficient way to use clay minerals as mineral tracer for identifying the sources and assessing erosion rate in the Dodar Ladiz dam watershed in a statistical method. The existence of four main clay minerals includes Kaolinite, Montmorillonite, Illite and Chlorite. The estimated watershed erosion rate is 2220.64 tons per square kilometer per year. Data ANOVA table in the inter/intra group communication of the clay minerals in the Dodar Ladiz dam watershed samples is shown by F-test statistics; there is a significant difference between the frequency of clay minerals in the samples with 95% confidence rate (P value < 0.05). Therefore, they can be divided into six groups. The average rates of the clay minerals are not equal in any of homogeneous hydrological reservoir units of the dam. Kruskal-Wallis test shows that the rate of frequency of Iolite mineral is identical among all samples of the hydrologic units and the dam reservoir; this mineral cannot be used as a tracer to identify the source. Reviewing the obtained data from statistical tests and studying clay minerals as a trace in determining the rate of degradation of upstream catchment “Dodar Ladiz” dam, it shows that the maximum annual erosion rate is 994.85 tons per sq/km, in the basin A within a 105.13 square kilometers area. Among the most important factors involving erosion and production of basin sediments, we can refer to lithology as the most critical factor and tectonic features, topography and climate as minor factors.
Theories of Equity in Health Care, Implications for Developed and Developing Countries
AR Olyaee Manesh
Iranian Journal of Public Health , 2005,
Abstract: Objective: This abstract focuses on theoretical background for the notion of “equity in health care” and on the implications of applying these theories to the health care of developed and developing countries. Equity Principals and the Implications: There are different theories about the principle of Equity or Justice such as Altruism, Utilitarians, Marxists, Rawls’ theory and Nazick’s entitlement. Among these theories, some of them are applicable to health care such as Libertarianism and Egalitarianism. The focus of the Libertarians is on the extent to which people are free to purchase the health care that they want. The Libertarians’ principle is the main equity base for private health systems. In contrast, Egalitarians suggest that finance of the health care should be according to the ability to pay and distribution of health care should be according to the need (ill health). It seems that policy makers in most developed countries such as European countries accept the Egalitarians’ principle and application of this equity principle by their health systems has significantly reduced health inequities and inequalities in these countries. There are a limited number of studies to look at equity in the health care of developing countries. A common equity principle for these countries is “equal access for everyone” and different mechanisms are applied to attain this target. Despite the overall improvements in health care in recent years, evidence indicates that many of developing countries have failed to provide equal access to health care for all in need. The financial limitations of the governments, spending about 70% of the health care resources on hospital-based care, unequal access to hospital services in favour of urban population, income inequalities among population, and lack of consistent and up-to-date information of inequalities, make developing countries unable to monitor and prevent inequities and inequalities of health care. Conclusion: The main equity principle in the health care of developed countries is Egalitarians’ principle in which, health care should be financed according to ability to pay and should be delivered according to the need. Applying the equity principals to the health care of developed countries has deeply promoted equitable health care in these countries. There are a limited number of studies about this issue in developing countries. A common equity target in these countries is “equal access for everyone in need” which is close to the Egalitarians’ point of view. However, some factors have hampered these countries’ attempt
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