Showing 14 results for Dadgar
Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract
The purpose of this study was to investigate the effectiveness of telling social stories on the use of some morphological features of speech in children with autism such as adverb, adposition, possession, article, compound noun, adjective and plural form of noun. This is an Interventional, quasi-experimental single group study with a pretest-posttest design. The study subjects were selected by convenience sampling method which included 10 Persian-speaking aged 7 to15 years old with autism spectrum disorder, requiring support, from all autism population in Qazvin Autism Center in 2019. The framework was based on the model of Brown 1973 and Naigles 2014 (taken from the research of Tek et.al 2014). Social stories were designed and organized, based on the model of Gray 1993. The children of autism received the intervention program in 10 individual sessions 30 to 45 minutes. The pre-test and post-test comparison of morphological categories in visual test and spontaneous test showed that the average use of names and particles in the post test was more than the pre-test for all cases. The biggest difference is related to the adposition. The result of the Wilcoxon test analysis showed that the training had a significant effect only on the visual test and on the article (according to the average of the pre-test and post-test, the statistical value and significance level = p˂0.05).
Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract
The purpose of this study was to investigate the effectiveness of telling social stories on the use of some morphological features of speech in children with autism such as adverb, adposition, possession, article, compound noun, adjective and plural form of noun. This is an Interventional, quasi-experimental single group study with a pretest-posttest design. The study subjects were selected by convenience sampling method which included 10 Persian-speaking aged 7 to15 years old with autism spectrum disorder, requiring support, from all autism population in Qazvin Autism Center in 2019. The framework was based on the model of Brown 1973 and Naigles 2014 (taken from the research of Tek et.al 2014). Social stories were designed and organized, based on the model of Gray 1993. The children of autism received the intervention program in 10 individual sessions 30 to 45 minutes. The pre-test and post-test comparison of morphological categories in visual test and spontaneous test showed that the average use of names and particles in the post test was more than the pre-test for all cases. The biggest difference is related to the adposition. The result of the Wilcoxon test analysis showed that the training had a significant effect only on the visual test and on the article (according to the average of the pre-test and post-test, the statistical value and significance level = p˂0.05).
Volume 4, Issue 3 (8-2016)
Abstract
Aim: Diabetes mellitus (DM) is a life time disease that requires change in patients' self-care and life style. The aim of this study was to determine the effects of predisposing, reinforcing and enabling factors on the self-care of patients with DM in Ardabil City, Iran in 2016.
Methods: This quasi-experimental study was conducted on 129 patients with DM referred to the diabetic centers of Ardabil. We used the components of PRECEDE model for planning the program. The educational program was executed on six information sessions. Changes in the predisposing, reinforcing, enabling factors and self-care behaviors one month after the intervention activities were assessed by using the same questionnaire. Data were analyzed through SPSS 16 software using descriptive and analytical tests.
Findings: The mean age of the patients was 56.82(±13.4) years, 69.8% of them were married and 20.2% were illiterate. According to the results, the mean scores for the knowledge, attitude, self-efficiency, self-care behavior, and reinforcement factors increased significantly after the educational intervention (p-value >0.001).
Conclusion: Educational intervention with PRECEDE-PROCEED model improved the diabetic patient’s self-care.
Volume 4, Issue 3 (summer 2019)
Abstract
According to the statute of the World Health Organization (WHO), health is considered as an individual and social value, and one of the most obvious human rights and needs. The carriage of heavy schoolbags by children is a concern for all those involved in student health and well-being. Backpacks are the most commonly used type of bag, and overweight backpacks are associated with several health issues, including increased spinal curvature, discomfort, and back and shoulder pain while the majority of students were carrying as much as 30% to 40% of their body weight. In this way posture modifications have been reported when children carry a load that corresponds to more than 10% of their body .
In addition Items carried by students in their daily school bags have been found to include, but are not limited to books, pencil cases, scientific calculators, and sport-specific training clothing, lunch boxes and full water bottles. Even an empty backpack can distort posture and cause pain. There is no way to safely carry weight in a backpack, no matter how light the load, because it disrupts our body mechanics by design .
Volume 7, Issue 1 (Winter 2022)
Abstract
Aim: Nowadays, schoolbags are considered to be resulted in musculoskeletal discomforts among students. This study set out to determine this health problem due to carrying school bag in students studying in high schools of Ardabil, Iran.
Method and Materials: This study was carried out among adolescent students in Ardabil city, Iran, in 2019. To collect data a socio-demographic questionnaire was used to complete demographic variables. Furthermore, standard scales were applied to measure weight and height of the students as well as weight of their school backpack. All data entered into the SPSS statistical software and analysed through descriptive analysis tests to determine the status of backpack among secondary high school students in Ardabil, Iran.
Findings: A total of 474 adolescent students with mean age of (13.51±1.13 years) were assessed in this study. According the findings, more than half of studied students used backpack while going to school. This study revealed the mean weight of studied students and their backpacks were 52.38 ± 12.34 kg and 3.57± 1.18kg respectively. Body Mass Index (BMI) was found to be 23.56. ± 6.84. The average weight of the backpack of first-year students was 3.45±1.25 kg, in second-year students, it was 3.55± 1.08 kg, and in third-year students, it was 3.69±1.21 kg.
Conclusion: As most of adolescent students used backpack in the way to school , complying with standard rules of backpack use is strongly recommended.
Yadolah Dadgar, Ali Akbar Ghafari,
Volume 8, Issue 3 (10-2008)
Abstract
In addition to its fiscal role, income tax does have its own allocative and distributive role too. A key role of income tax is its distributive one, because of which the first principle of tax is “justice principle”. The responsibility of this paper is investigating the salary taxing on income distribution in Iranian economy. To evaluate the above problem, we have tested the models of,so called ,Engel, Galetoric and Raddatz in Iranian economy. We also have called those modeling system ”EGR” .The findings of our paper shows that the optimum tax rates in Iranian economy for years of third development plan are (respectively), 25.18,28.28,12.5,12.5,12.5.So when we compare the actual tax rates with the optimum ones we observe a considerable gap between potential and actual situation in Iranian tax system.
Volume 10, Issue 2 (Spring 2022)
Abstract
Aims: COVID-19 has harmed people's lives and efforts are being made to speed up vaccinations. The growing problem of vaccine uncertainty may affect the uptake of the COVID-19 vaccine. The objectives of this study were to examine the determinants of COVID-19 vaccine acceptance.
Materials & Methods: From July 3 to September 25, 2021, we conducted a web-based, cross-sectional study among the citizens of Ardabil with a snowball sampling strategy under a highly restricted environment. A questionnaire was designed and filled out by 768 participants through social media and email. Associations between COVID-19 vaccine acceptance and determinants were explored using the chi-squared test. Key determinants that predict vaccine acceptance among respondents were modeled through logistic regression analysis.
Findings: Of the 932 survey invitees, 768 responded to the questionnaire (response rate, 82.4%). The majority (55.2%) of the study participants were female. Of the 768 respondents, 486 (63.2%) showed interest to accept the COVID-19 vaccine. Willingness to get the vaccine is relatively high among older age groups (59.4% among 40+ year old), being married (56.9%), and city dwellers participants (83.09%). In multivariate model, respondents who were above 40 years (OR: 0.7; 95% CI:0.5-0.94), and married (OR: 1.43; 95% CI: 0.97-2.09) were significantly associated with vaccine acceptance (p<0.05). Besides, people having trust in the health system and vaccine were most likely to accept the vaccine (OR: 1.26; 95% CI: 1.01-1.56), and those having a higher perceived risk of acquiring infection were 4.83 times (OR: 4.83; 95% CI: 3.78-6.17) higher odds of accepting the vaccine.
Conclusion: Our study identified religious/personal beliefs and risk perceptions as the most important predictors that would be affecting COVID-19 vaccine uptake.
Yadollah Dadgar, Towhid Firouzan Sarnaghi,
Volume 12, Issue 4 (Winter 2012 2013)
Abstract
For determining the profit in transactional contracts, there is no a comprehensive theory. Some viewpoints are very general and others are based on exchange rate of return, which contain speculative difficulties. Some others use international Libor rate and so on. Due to the lack of a consistent theory, this paper is introducing shadow cost approach to fill the gap in question. This is indeed going to estimate capital return or opportunity cost of capital. Introducing an efficient method is the main finding of this paper. In terms of methodology, this paper is based on statistical analysis and econometric methods.
Volume 14, Issue 13 (First Special Issue 2015)
Abstract
In this paper, the Finite Cell Method (FCM) is used to predict the ductile damage and crack evolution in ductile materials under small strains and nonlinear isotropic hardening conditions. In the first step, a fully coupled elastic-plastic-damage model based on modified Lemaitre ductile damage model was developed and implemented into FCM implicit codes. Also the effect of micro-crack closure, which may dramatically decrease the rate of damage growth under compression, was incorporated and its computational implementation was discussed. The FCM is the result of combining the p-version finite element and fictitious domain methods, and has been shown to be effective in solving problems with complicated geometries for which the meshing procedure can be quite expensive. It, therefore, combines fast and simple mesh generation with a high convergence rate inherited from p-FEM. The performance of the FCM and damage model is verified by means of numerical examples and the results were compared with exprimental observation. The results showed that modified Lemaitre damage model can be used as a quick and accurate tool to predict ductile damage and fracture in metal forming processes.
Volume 15, Issue 7 (9-2015)
Abstract
One of the most important issues in the review of cold roll forming process of metals is estimation of required torque. The optimum production line can be designed by determining the effective parameters on torque. Some of these parameters are sheet material and thickness, bending angle, lubrication conditions, rolls rotational speed and distance of the stands. The aim of this study is to predict amount of required torque considering the factors influencing torque, including thickness, yield strength, sheet width and forming angle using artificial neural network. So the forming process was 3D simulated in a finite element code. Simulation results showed that with increase of yield strength, thickness and forming angle, applied torque on rolls will increase. Also the increase in sheet width -assuming constant web length- will decrease the torque needed for forming. The effects of thickness and sheet width were experimentally investigated which verified the results obtained by finite element analysis. A feed-forward back-propagation neural network was created. The comparison between the experimental results and ANN results showed that the trained network could predict the required torque adequately.
Volume 16, Issue 5 (7-2016)
Abstract
Today, with the development of technology, industries such as automotive and construction require products with variable cross section. Multiplicity of steps, dimensional limitation and high production costs of the components caused flexible roll forming process used to produce these products. One of the main defects in this process is the fracture phenomenon. The fracture is observed on the bending edges at transition zone that sheet thickness is large compared to the bending radius. In this research the fracture phenomenon is investigated on flexible roll forming process of channel section using ductile fracture criteria. For this purpose finite element simulation of the process using Abaqus software is done. The fracture defect in this process is investigated using six ductile fracture criteria by developing a subroutine. Experimental tests are performed on 27 specimens precut sheet of AL6061-T6, using flexible roll forming machine built in Shahid Rajaee University. By comparing simulation results with experimental results, numerical results were validated. In addition, by comparing the results of ductile fracture criteria with experimental results, the Argon ductile fracture criteria, was chosen as the most appropriate criterion to predict fracture. Also the effects of parameters as sheet thickness, bending radius and bending angle on fracture with argon selected criterion is studied.
Volume 19, Issue 11 (November 2019)
Abstract
In this paper, a simple, practical and versatile model has been developed for a self-activated acoustic driven spherical swimmer that its surface may oscillate partially at dipole state (first mode of vibration). Regard to the nonlinear acoustic effects, the net acoustic radiation force exerted on the device is analytically derived and the non-zero states are approved. Considering hydrodynamics effects assuming low Reynolds number operating condition, the effects of active section angle and frequency of operation on the force, velocity and requirement power of swimmer are discussed. It is shown that comparing with many types of artificial and natural living matter swimmers, the swimming velocity of the developed model is satisfactory. The challenge of the random walk due to host medium fluctuations is discussed, and it is shown that the developed model can overcome the ubiquity of the Brownian motion, as well. Due to the simplicity of the developed model which leads to computing the swimmer features (such as force, velocity, etc.) analytically, this study can be considered for development of contact-free precise handling, drug distribution and delivery systems, entrapment technology of active carriers and the self-propulsive controllable devices which are essential in many engineering and medicine applications.
Volume 22, Issue 1 (January 2021)
Abstract
In this paper, using finite element simulations and experimental results, the changes in deformation length and longitudinal strain in flexible roll forming are investigated and the relationship between them is determined. Flexible roll forming is a novel manufacturing process for producing profiles with variable cross-section. One of the important parameters of this process is the distance from the starting point of the deformation before the forming station to the central cross-section of the rolls at that station, which is called the deformation length. This parameter plays a key role in determining the distance between the forming stations and the deformation behavior of the sheet. The effect of roll diameter and mechanical properties of the sheet on the deformation length is also determined. The results showed that the maximum deformation length occurs when forming the stretching zone of the channel profile with variable cross-section, which is due to the additional tension applied to the edge due to the concave geometry of the flange in this zone. The results also showed that with increasing roll diameter and yield stress, the deformation length in all four of the stretching and compression zones and the slim and wide areas of the channel profile with variable cross-section increases, while with increasing sheet thickness, the deformation length in these zones decreases.
Volume 23, Issue 8 (August 2023)
Abstract
The roll forming of an asymmetrical channel section is associated with a twisting defect, but this defect also occurs in a symmetrical section whose holes are asymmetrical. Therefore, first, a finite element model was presented to investigate the process. By designing the full factorial method, the important factors affecting the twisting defect and the effect of each during the cold roll forming process have been investigated. In the end, it was concluded that the thickness of the sheet and the diameter of the holes are the most important factors affecting the twisting defect. It was concluded that the greater the difference in the diameter of the holes on both sides of the channel, the higher the amount of twisting defect. For the forming angle of 45 degrees, by increasing the thickness of the sheet from 2 mm to 3 mm, the twist angle of the piece increased from 1.5 degrees to 2.5 degrees. According to the behavior of the metal, a series of experimental tests were designed and the effect of the hole diameter factor on this defect was determined. Appropriate matching of experimental and numerical results indicates reliable and verifiable numerical results.
