Incidence, Trends and Epidemiology of Cancers in North West of Iran

Zahedi, Atefeh,Rafiemanesh, Hosein,Enayatrad, Mostafa,Ghoncheh, Mahshid,Salehiniya, Hamid Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16

Background: Cancer is a leading cause of death throughout the world. Increasing life expectancy and aging population are important factors for increasing cancer incidences in developing countries. National programs are essential for prevention and control of cancer in any society. This study aimed to investigate cancer epidemiology and trends in the province of Hamadan, located in Northwest Iran. Materials and Methods: This analytical study was carried out based on cancer registry data from 2004 to 2009 in the province of Hamadan, analyzed using STATA (version 12) software for descriptive tests and Join point 4.1.1.1 software for analytical tests. Results: There were 7,767 registered cases of cancer during the 6 years studied. Of the total cases registered, 59.1% (4,592 cases) involved men and 40.9% (3,175 cases) occurred in women. Age-standardized incidence rates (ASR) increased from 72.9 to 132.0 in males and 48.2 to 115.0 in females during the 6 years of the study (p<0.001). The most common cancers were skin, stomach, breast, bladder, and leukemia. In women, teh most common were breast, skin, stomach, colorectal, and leukemia, in that order, and in men skin, stomach, bladder, leukemia, and prostate cancers. Conclusions: The cancer incidence is greater in men that women in this region but with increasing trends in both sexes. Planning regarding education in prevention of exposure to risk factors and control strategies is required to decrease the incident cases. Screening programs for common cancers in older age groups might be helpful to reduce the disease impact.

Motion Detection and Velocity Estimation Using Cellular Automata

Abbas Zahedi Kouzani,Abdesselam Bouzerdoum,Michael Liebelt 대한전자공학회 1994 ICONIP : International Conference On Neural Inform Vol.3 No.2

Simulation and optimization of ethanol amine production plant

Gholamreza Zahedi,Saeideh Amraei,Mazda Biglari 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6

An industrial Ethanol Amine (EA) production plant was simulated and optimized. Due to lack of accurate reaction rate information, the first step involved obtaining reliable kinetic data from the SRI (Stanford Research Institute) industrial database and calculation using error minimization method. In the next step, by implementing the obtained reaction kinetics the whole plant was simulated using Hysys software. Simulation results were compared with the SRI data and showed that there is acceptable agreement between simulation and the measured industrial data. In the next step of study by applying the gradient search (GS) optimization technique the plant was optimized using: feeding ammonia to ethylene oxide (EO) molar ratio, water flow rate in the feed stream, and reactor temperature as optimization variables. Employing process profit as objective function the optimal operating conditions were found to be: ammonia to EO ratio of 5 (mol/mol), water flow rate of 52.59 kg mol/hr and reactor temperature of 85 ℃.

The Effects of Phonological Features on Iranian E리 learners Listening Comprehension

( Hameed Zahedi ),( Rahman Sahragard ),( Zahra Nasirizadeh ) 범태평양 응용언어학회 2007 Journal of Pan-Pacific Association of Applied Ling Vol.11 No.2

A new vapor pressure equation for pure substances

Gholamreza Zahedi,Sasan Mohammadzadeh 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6

A new simple equation for prediction of vapor pressure of pure substances is proposed. The equation which has the Clausius-Clapeyron (C-C) equation form consists of three parameters: critical temperature, critical pressure and normal boiling point. Experimental data for organic and inorganic substances have been used to calculate equation parameters in the boiling point ranges from 169.45 to 457.55 K and critical temperature ranges from 282.75 to 699.15 K. Comparison of proposed equation estimation results with experimental data shows that the new equation has minor average error. The new equation is also 68 percent more accurate than the C-C equation

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane–air mixtures

Peyman Zahedi,Kianoosh Yousefi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1

We studied the effects of increasing pressure and adding carbon dioxide, hydrogen and nitrogen to Methane-air mixture on premixedlaminar burning velocity and NO formation in experimentally and numerically methods. Equivalence ratio was considered within 0.7 to1.3 for initial pressure between 0.1 to 0.5 MPa and initial temperature was separately considered 298 K. Mole fractions of carbon dioxide,hydrogen and nitrogen were regarded in mixture from 0 to 0.2. Heat flux method was used for measurement of burning velocities ofMethane-air mixtures diluted with CO2 and N2. Experimental results were compared to the calculations using a detailed chemical kineticscheme (GRI-MECH 3.0). The results in atmosphere pressure for Methane-air mixture were calculated and compared with the results ofliterature. Results were in good agreement with published data in the literature. Then, by adding carbon dioxide and nitrogen to Methaneairmixture, we witnessed that laminar burning velocity was decreased, whereas by increasing hydrogen, the laminar burning velocitywas increased. Finally, the results showed that by increasing the pressure, the premixed laminar burning velocity decreased for all mixtures,and NO formation indicates considerable increase, whereas the laminar flame thickness decreases.

Preparation and Release Properties of Electrospun Poly(vinyl alcohol)/ Poly(ε-caprolactone) Hybrid Nanofibers: Optimization of Process Parameters via D-Optimal Design Method

Payam Zahedi,Iraj Rezaeian,Seyed Hassan Jafari,Zeinab Karami 한국고분자학회 2013 Macromolecular Research Vol.21 No.6

The main purpose of this work was to develop biomedical electrospun nanofibrous mats based on a poly(vinyl alcohol)/poly(ε-caprolactone) (80/20) hybrid with a defined drug release rate using tetracycline hydrochloride as a model drug. The electrospinning process parameters, such as polymer solution concentration, distance between injecting syringe tip/collector, voltage, injected flow rate and the polyvinyl alcohol crosslinking time were optimized via a D-optimal design method for a suitable nanofiber diameter with an optimal drug release rate. The morphology of nanofibers and their mean diameters were studied by a scanning electron microscopy technique. The results showed that the mean diameters of nanofibers were significantly reduced after drug loading. The swelling,weight loss and biodegradability of nanofibers samples investigated by FTIR were also determined. Two main mechanisms via penetration and erosion were evaluated. In vitro drug release in a phosphate buffer environment at pH=7.2for the samples demonstrated that the polymer type and hydrophilic nature of the polymer/drug system is very effective in the kinetics and mechanism of drug release. Hybridization of poly(vinyl alcohol)/poly(ε-caprolactone) with a known ratio showed to be a suitable and useful method in the electrospinning of nanofibers samples for superior control of the drug release rate. Finally, nanofibrous mats of polyvinyl alcohol and polyvinyl alcohol/poly(ε-caprolactone)hybrid (80/20) had much better drug release rate characteristics for tetracycline hydrochloride as a model drug compared with cast film samples loaded with the same drug.

Motion Detection and Velocity Estimation Using Cellular Automata

Abbas Zahedi Kouzani,Abdesselam Bouzerdoum,Michael Liebelt 대한전자공학회 1994 ICONIP : International Conference On Neural Inform Vol.3 No.3

Professional learning communities at a primary and secondary school network in India

Siamack Zahedi,Camille L. Bryant,Anuj Iyer,Rhea Jaffer 서울대학교 교육연구소 2021 Asia Pacific Education Review Vol.22 No.2

Schools in India typically provide teachers with professional development in the form of workshops with a one-size-fits-all approach. However, a large body of international studies show this to be ineffective in transforming classroom practice, and the draft National Education Policy of India released in 2020 lists several shortcomings of current in-service professional development practices across the country. On the other hand, a large body of international research has emerged to show that professional learning communities (PLCs) are one of the most effective means to improving teacher practice and student learning. Yet, the National Education Policy does not make any explicit mention of PLCs. This study shows that the benefits of PLCs researched in international contexts may apply to the Indian context too because it was found that participation in PLCs might have supported increased collaboration among teachers, improved classroom teaching, and increased unity and consistency in practice across classrooms, at two schools in India. Also, this paper presents important findings related to the successful planning and operationalization of PLCs in the context of Indian schooling. It is hoped that with the publication of this study, public and private schools in India will be encouraged and better prepared to take steps towards the establishment of PLCs in their institutions as a key lever for school improvement.

Formulation for Free-standing Staircase

Saeid Zahedi Vahid,Mohammad Ali Sadeghian,Siti Aminah Bt. Osman,Abdul Khalim Bin Abdul Rashid 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6

In the analysis of a free-standing staircase with slab elements, approximate analytical methods are sometimes used because of the absence of specific code provisions due to their inherent limitations. These approaches, however, cannot predict the actual threedimensional (3D) behavior of the stair slab system. In addition, analytical methods cannot predict the stress resultant distribution in any section. These drawbacks highlight the need for the development of more rational but simple analysis methods for design purposes. Thus, in this study, an extensive numerical study on the behavior of free-standing staircases was performed using the finite element package SAP2000. A sensitivity study on the different geometric parameters and material properties that affect the design force and moments was also conducted. As a result of this study, semi-empirical equations are proposed from which the design forces and moments can be calculated in a single step. The accuracy of the equations within an acceptable limit is established by comparison with the results of rigorous FE analyses. Finally, the proposed design equations lead to a simple, straightforward and safe design while simultaneously representing the true behavior of 3D free-standing stair slabs.