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Search Results: 1 - 10 of 149772 matches for " H. Zeraati "
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An Investigation on DMFT and DMFS of First Permanent Molars in 12 Year Old Blind Children in Residential Institutes for Blinds in Tehran, Iran
H. Zeraati,M. Ghandahari Motlagh
Journal of Medical Sciences , 2006,
Abstract: A descriptive study on 12 year old blind children, in residential Institutes for blinds in Tehran was carried out to determine Decayed, Missing and Filled Teeth index (DMFT) and Decayed, Missing and Filled Surfaces Index (DMFS), considering socio-economic and oral health variables. All sixty three 12 year old blind children in three institutes were studied. A general questionnaire, as well as a dental questionnaire including some information on the first molars, were completed by this population. The average DMFT of the first molars was 3.30 1.19 and the average DMFS was 6.22 3.95. DMFT was higher in the lower molar, comparing to the upper ones. However, DMFS was higher in the upper molars. The present study shows that the values of these indices, among blind children, are close to those of normal population, indicating that under controlled health condition and good education, acceptable values for DMFT and DMFS will be obtained.
Equivalence of a one-dimensional driven-diffusive system and an equilibrium two-dimensional walk model
Farhad H. Jafarpour,Somayeh Zeraati
Physics , 2009, DOI: 10.1103/PhysRevE.81.011119
Abstract: It is known that a single product shock measure in some of one-dimensional driven-diffusive systems with nearest-neighbor interactions might evolve in time quite similar to a random walker moving on a one-dimensional lattice with reflecting boundaries. The non-equilibrium steady-state of the system in this case can be written in terms of a linear superposition of such uncorrelated shocks. Equivalently, one can write the steady-state of this system using a matrix-product approach with two-dimensional matrices. In this paper we introduce an equilibrium two-dimensional one-transit walk model and find its partition function using a transfer matrix method. We will show that there is a direct connection between the partition functions of these two systems. We will explicitly show that in the steady-state the transfer matrix of the one-transit walk model is related to the matrix representation of the algebra of the driven-diffusive model through a similarity transformation. The physical quantities are also related through the same transformation.
Multiple-transit paths and density correlation functions in PASEP
Farhad H. Jafarpour,Somayeh Zeraati
Physics , 2010,
Abstract: We consider the partially asymmetric simple exclusion process (PASEP) when its steady-state probability distribution function can be written in terms of a linear superposition of product measures with a finite number of shocks. In this case the PASEP can be mapped into an equilibrium walk model, defined on a diagonally rotated square lattice, in which each path of the walk model has several transits with the horizontal axis. We particularly show that the multiple-point density correlation function in the PASEP is related to the probability that a path has multiple contacts with the horizontal axis from the above or below.
Dental Health Status in 3-5 Year Old Kindergarten Children in Tehran-Iran in 2003
M. Ghandahari-Motlagh,H. Zeraati
Journal of Dentistry of Tehran University of Medical Sciences , 2005,
Abstract: Statement of Problem: Assessing oral hygiene in children plays an important role in determining the health status of communities and evaluating national health promotion programs. In 1997 in Geneva, international organizations agreed on the global goal of achieving a minimum of 90% caries free teeth in 5 year old children.Purpose: This study was aimed to assess the oral health status in Iranian children.Materials and Methods: Among kindergarten children residing in the capital of Iran,Tehran, 400 children between the ages of three and five years were randomly selected and participated in this study. Their deciduous teeth were examined and the health index of dmft was determined for each child. The collected data were analyzed using the oneway ANOVA (with Tukey–Kramer multiple comparisons test for Post Hoc test), t test,and chi square test.Results: In this age group, only 48.3% of the children had no tooth decay. This information shows how far we are from accomplishing the aforementioned goal. A significant increase in tooth decay in these children was correlated with neglecting oral and dental hygiene, and also failing to brush the teeth regularly and wash the mouth after consuming sweets (P<0.001). Unfortunately, visits to dentists for regular checkups are not frequent enough, and dental caries was seen more in children who did not have regular visits than those who did (P<0.001).Conclusion: More accurate planning seems necessary to achieve 90% caries free teeth in 5 year old children. More emphasis must be placed on prevention programs and educating public to observe dental hygiene by brushing the teeth regularly, washing the mouth after consuming sweets, and paying their dentists regular visits.
A Simulation Study on Robust Alternatives of Least Squares Regression
M. Mohebbi,K. Nourijelyani,H. Zeraati
Journal of Applied Sciences , 2007,
Abstract: We applied four methods of linear regression; the least squares, Huber M, least absolute deviations and nonparametric to several distributional assumptions. The same sets of simulated data were used and MSE, MAD and biases of these methods were compared. The least absolute deviations, Huber M and nonparametric regression shown to be more appropriate alternatives to the least squares in heavy tailed distributions while the nonparametric and LAD regression were better choices for skewed data. However, no best method could be suggested in all situations and using more than one method of exploratory data analysis is recommended in practice.
Phase transition in an exactly solvable reaction-diffusion process
Somayeh Zeraati,Farhad H. Jafarpour,Haye Hinrichsen
Physics , 2013, DOI: 10.1103/PhysRevE.87.062120
Abstract: We study a non-conserved one-dimensional stochastic process which involves two species of particles $A$ and $B$. The particles diffuse asymmetrically and react in pairs as $A\emptyset\leftrightarrow AA\leftrightarrow BA \leftrightarrow A\emptyset$ and $B\emptyset \leftrightarrow BB \leftrightarrow AB \leftrightarrow B\emptyset$. We show that the stationary state of the model can be calculated exactly by using matrix product techniques. The model exhibits a phase transition at a particular point in the phase diagram which can be related to a condensation transition in a particular zero-range process. We determine the corresponding critical exponents and provide a heuristic explanation for the unusually strong corrections to scaling seen in the vicinity of the critical point.
Entropy Production of Nonequilibrium Steady States with Irreversible Transitions
Somayeh Zeraati,Farhad H. Jafarpour,Haye Hinrichsen
Statistics , 2012, DOI: 10.1088/1742-5468/2012/12/L12001
Abstract: In nature stationary nonequilibrium systems cannot exist on their own, rather they need to be driven from outside in order to keep them away from equilibrium. While the internal mean entropy of such stationary systems is constant, the external drive will on average increase the entropy in the environment. This external entropy production is usually quantified by a simple formula, stating that each microscopic transition of the system between two configurations $c \to c'$ with rate $w_{c\to c'}$ changes the entropy in the environment by $\Delta S_{\rm env} = {\ln w_{c \to c'}}-{\ln w_{c' \to c}}$. According to this formula irreversible transitions $c \to c'$ with a vanishing backward rate $w_{c'\to c}=0$ would produce an infinite amount of entropy. However, in experiments designed to mimic such processes, a divergent entropy production, that would cause an infinite increase of heat in the environment, is not seen. The reason is that in an experimental realization the backward process can be suppressed but its rate always remains slightly positive, resulting in a finite entropy production. The paper discusses how this entropy production can be estimated and specifies a lower bound depending on the observation time.
Health State Valuation in Iran: An Exercise on Cardiovascular Diseases Using Visual Analogue Scale Method
H Bakhshandeh,K Holakouie Naeini,H Zeraati,MH Forouzanfar
Iranian Journal of Public Health , 2009,
Abstract: "nBackground: Disability Weights (DWs) are main components for computing summary measure of population health (SMPH) and economic studies. They are specific for each community, but there are no previous studies in Iran. In this study, we investigated the feasibility of health state valuation (HSV) in Iranian population."nMethods: Twelve cardiologists in 3 sessions of expert panels, defined 25 states, related to cardiovascular diseases (3 major and 22 specific diseases). From January to March 2008, 80 persons in 4 groups including: physicians, patients, patients' families and general publics (each group 20), were interviewed and valuated the states, using visual analogue scale (VAS) method. SPSS 15 for window (SPSS Corporation, Chicago, Illinois) was used for statistical analysis."nResults: Data showed that the defined health states had various severities. All the 4 groups ranked the "3 major-dis-eases" and "very-mild" and "very-severe" states, similarly. Non-physicians were not able to differentiate among "val-vular-dis-eases" and "pacemakers" properly. The reliability of responses was acceptable."nConclusion: VAS is an appropriate and reliable method for HSV in Iranian population. Non-physicians' opinions can be consider in major cardiac diseases. Valuation of more specific situations must perform by physicians.
The Survey Of The Quality Of Drug Prescription To Under 5 Years Children By Behvarzes in Eslamshar Town And The Related Factors (year 2000)
$adegiPoor HR,EftekharArdabili H,Zeraati H,Mosleh A
Tehran University Medical Journal , 2003,
Abstract: This research studies the quality of medical prescriptions for children under 5 years of age and their effective factors carried out by Behvarzes at Eslamshar town."nMaterials and Methods: The study took place in 19 health houses considering the medical family files of patient children seeking for medical care by 33 Behvarz for quality of medical prescription. Two questionnaire were used for the study. The first questionnaire contained information about children medical prescription and variables evaluated in relation to medical prescription dose, duration of consumption and the cure duration period, which carried out for both girl and boy group separately. The second questionnaire contained information about the condition of working Behvarzes demographic in health houses considered variable for Behvarzes are: Age, Sex , experience, education, place of residence marital status."nResults: The important points of the study are as follow: - In cases that according to Behvarzy training patient follow up is necessary, 56.9%of the needed cases did not full fill the appropriate and necessary follow up program. - One of the important constraints of the research is the high percent of unrecorded cases by Behvarzes including:"n1 - 1.2% unknown medical prescriptions."n2- 44.2% unknown dose of prescribed medicine"n3- 52.4% unknown care duration period"n4- 36.5% unknown period of time for taking the medicine. Conclusion: According to the information: 1- 64.9 dose of prescribed medicine"n2- 73.2 period of time for taking the medicine"n3- 84.1 care duration period There were appropriate.
Structure, Process and Performance of the Emergency Unit of Teaching Hospitals of Tehran University of Medical Sciences
H Rahmani,M Arab,F Akbari,H Zeraati
Journal of School of Public Health and Institute of Public Health Research , 2006,
Abstract: Background and Aim: Nowadays, community health and different methods for health service delivery are among the most important public health issues in many countries. Most developing nations are trying to establish a health care system capable of meeting their basic needs.Hospitals are the most important service delivery points, and they need skilled manpower and adequate equipment for efficient performance of their medical care and educational functions. Today, the health of the mankind is facing greater hazards and challenges than at any other time in history, and within this context, hospitals are supposed to provide service of the highest standards and with minimum delay. Emergency wards are the sections where these principles apply more than anywhere else. These are rightly regarded as the "heart" of any hospital and a quick, efficient workflow in the emergency room can literally save lives. Material and Methods: This was a cross–sectional (descriptive/analytic) performed in 2005 to assess the structure, process & performance in the emergency wards of 12 teaching hospitals affiliated to Tehran University of Medical Sciences. Results: 33.3% of the ward chiefs were women the rest were men; they were all more than 30 years of age. The average rate for implementing proper managerial standards was 90.6%. The "manpower index" was 69.1%, and the "facilities & equipment" index was 44/5%. The "directions index" and "activities index" were 66.97% and 93.5%, respectively. Conclusion: The findings show that there is a positive and significant relationship between standards of management at the emergency department and the facilities and equipment index. Also, there are positive correlations between the emergency department's "manpower and rules" index instructions, activities, and years of service in hospitals.
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