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Search Results: 1 - 10 of 149766 matches for " Dalvand H "
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The Efficacy of Botulinum Toxin Type a Injection in the Hamstring and Calf Muscles With and Without Serial Foot Casting in Gait Improvement in Children With Cerebral Palsy
Amirsalari S,Dalvand H,Dehghan L,Feizy A
Tehran University Medical Journal , 2011,
Abstract: Background: The goal of this study was to compare the efficacy of botulinum toxin type A (BTX-A) injection in the hamstring and calf muscles with and without ankle serial casting in the improvement of gait in children with cerebral palsy (CP).Methods : This double-blind prospective clinical trial was performed on 25, 2 to 8-year-old children with hemiplegic or diplegic CP in Tehran, Iran in 2010. The participants were chosen by simple randomized sampling and were matched for age, gross motor function classification system (GMFCS) and type of CP and were randomly divided into two groups: children in the first group (13) only received BTX-A injection, but the second group (12) received BTX-A and serial foot casting starting one week after the injection.Results : Comparison of the gross motor function, right and left knee spasticities and passive ROM of both knees between the two groups before and 1, 3, 6 and 12 months after the injections were not statistically significant (P>0.1). Furthermore, comparison of the right and left ankle spasticities and passive ROM before the injections and in1 and 3-month follow-ups did not show a statistically significant difference (P>0.1), but the differences were significant in 6 and 12-month follow-ups (P<0.05).Conclusion: BTX-A injection with serial foot casting vs. BTX-A alone was more effective in decreasing spasticity and improving passive ROM in the ankle of children with CP, but such injections in the hamstrings were not useful in these regards.
Neuroplasticity After Injury
Leila Dehghan,Hamid Dalvand
Modern Rehabilitation , 2008,
Abstract: Background and aim: There is neuroplasticity in all of life time, from newborn to elderly and neuronal connections are being created and broken by experiences and states of health or disease. The recovery of people with stroke or cerebral palsy can be a sign of neuroplasticity. The aim of this article is to detect significance of neuroplasticity and critical period of recovery in central nervous system after stroke and cerebral palsy. Materials and methods: This study is based on review of internal and external articles that published about neuroplasticity in central nervous system after stroke and cerebral palsy from 1987 to 2007. Results: According to review the articles; the mechanisms of neuroplasticity after stroke and cerebral palsy consist of Axonal and dendrites Sprouting, cortical reorganization and neurogenesis. The rehabilitation protocols have a direct effect on integration and reorganization in intact areas adjacent to injured motor areas of cortex. Conclusion: This study showed that reorganization continually occurs in response to task, behavior and learning skills. Keywords:Neuroplasticity-Stroke- Cerebrovascular accident- Cerebral palsy- Rehabilitation, Cortical reorganization
Effect of needle number on drying rate of kiwi fruit in EHD drying process  [PDF]
Mohammad Jafar Dalvand, Seyed Saeid Mohtasebi, Shahin Rafiee
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.41001
Abstract: Electrohydrodynamic (EHD) drying is a novel method of non-thermal processing. In this drying method, drying can be carried out using either AC or DC high voltages. The thermodynamic considerations regarding the lowering of temperature under EHD drying include rapid rates of evaporation and exothermic interaction of the electric field with a dielectric material. Multi-point and plate electrode systems are efficient in accelerating drying of agricultural materials. The electrode produces corona wind, which resembles a round jet, impinges and removes moisture from the surface. The enhancement of drying rate by corona discharge from needle electrodes has been experimentally evaluated in this study. Effects of three different categories, one needle, nine needles and seventeen needles on drying rate of kiwi fruit were studied, moreover in each category, Experiments were carried out using DC voltage levels of 6, 10.5 and 15 kV and field intensities 4.5 kV/cm. Results showed that the effect of needle number on drying rate was significant and drying rate of kiwi fruit reduced with increasing in needle numbers.
Effect of Vestibulo-Proprioceptive Stimulations in a Child with Agenesis of the Corpus Callosum
Hamid Dalvand,Leila Dehghan,Dr Hossein Bagheri
Audiology , 2010,
Abstract: Background and Aim: The purpose of the present study was to investigate the effect of vestibulo-proprioceptive stimulations of sensory integration theory on the development of gross and fine motor, language and personal-social functions in a child with agenesis of the corpus callosum.Case: We report a 10.5 month old boy with agenesis of the corpus callosum. The intervention was administered based on sensory integration theory an hour a week for 20 weeks. The exercise intervention consisted of proprioceptive and linear, sustained and low frequency vestibular stimulations on suspension device and physio roll. A Denver Developmental Screening- II and milestones skill testing was completed pre-intervention and monthly. Post-intervention, age of gross motor, fine motor adaptive, language, and personal-social functions significantly improved. Based on milestones skills, maintenance of gross motor functions (e.g. sitting and quadruped position) improved. The child could roll from side to side and released objects voluntarily. The reaction time to auditory stimulations became less than 2 seconds.Conclusion: vestibulo-proprioceptive stimulations using the neuroplasticity ability of the central nervous system is effective for development of gross and fine motor, language, and personal-social functions. These exercises can be administered for a child with agenesis of the corpus callosum.
Treatment of Synthetic Wastewater Containing Reactive Red 198 by Electrocoagulation Process
A Dalvand,A Jonidi jafari,M Gholami,A Ameri
Iranian Journal of Health and Environment , 2011,
Abstract: "nBackground and Objectives: Discharge of textile colored wastewater industries without providing enough treatment in water bodies, is harmful for human and aquatic organisms and poses serious damages to the environment. Most of conventional wastewater treatment methods don't have enough efficiency to remove textile dyes from colored wastewater; thus in this research the efficiency of electrocoagulation treatment process with aluminum electrodes for treatment of a synthetic wastewater containing C.I. Reactive Red 198 in batch reactor was studied."nMaterial and Methods: The experiment conducted in a Plexiglas reactor with a working volume of 2L that equipped with 4 aluminum electrodes. The effects of operating parameters such as voltage, time of reaction, initial dye concentration and interelectrode distance on the color removal efficiency, electrical energy consumption and electrode consumption were investigated."nResults: in the optimum operational condition electrocoagulation, is able to remove color and COD as high as 99.1 and 84.3% in aluminum electrode in 75 minutes at 20 volt and 2 cm interelectrode distance, respectively. Under this condition, operating cost was 2986 rails per cubic meter of treated wastewater. Increase in the interelectrode distance and initial dye concentration,lead to the decrease in efficiency of dye and COD removal.While as the voltage and time of reaction increased, energy consumption, electrode consumption, final pH and color removal, increased too."nConclusion: electrocoagulation process by aluminum electrode is an efficient and suitable method for reactive dye removal from colored wastewater.
The Effect of Home Based Lovaas Approach on Social Interaction, Speech and Language, Play and Behavior Skills, and Intensity of Autism in Young Children with Autism
Hamid Dalvand,Leila Dehghan,Avat Feizy,Seyed Ali Hosseini
Modern Rehabilitation , 2009,
Abstract: Background and aim: The aim of this study was to determine effect of home based lovaas approach on social interaction, Speech and language, Play and behavior skills, and intensity of autism in young children with Autism. Materials & Methods: This study was a quasi-experimental, interventional pre/post design. Thirty children with Autism were selected by convenience sampling in a rehabilitation center by matching closely, 8 years old, in Tehran city. The impact of lovaas approach was evaluated in children with Autism. For evaluation total scores and dimension of social interaction skills speech and language play a behavior before and after therapeutic intervention we used The PDD assessment scale/screening questionnaire. The results were analyzed with paired T test and wilcoxon signed and multivariate T2 Hotteling and SPSS software edition 17. Results: After intervention PDD assessment scores decreased (P<0/001). Significant progress were observed in social interaction skills (P<0/001).Speech and language (P=0/001), play (p<0/001) and behavior (P= 0/002). Significant decrease wasn't seen in the intensity of PDD after intervention (P> 0/05). Conclusion: The result showed that home based lovaas approach increased the social interaction, Speech and language, Play and behavior skills in children with Autism .
Earning Quality and Stock Return of Listed Companies in Tehran Stock Exchange (TSE)
Mohammad Hadi Zohdi,Hashem Valipour,Mohadese Hasani,Mohammad Reza Dalvand
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Earning quality is referred to the closeness of operating earnings to cash flow of operation. The more the distance of earning with cash flow, the less the earning quality and the less the ability of earning to explain stock return changes. Therefore, the present study aims to investigate the relation between earning quality and gained return by stockholders. To do the research, 157 companies of the companies listed in TSE were selected and the related data were studied during 2006 to 2010 by statistical tests of Analysis of Variance (ANOVA) and correlation. The results indicated that among different classified companies, there is not different return average based on earning quality. The other results show that there was no significant relation between earning quality and stock return of the companies.
Responses of salivary cortisol and α-amylase to official competition
Journal of Human Sport and Exercise , 2011,
Abstract: This study was designed to determine the relationship between salivary cortisol, α-amylase and total protein response in the official football players during the course of a game. Nine young amateur football players agreed to participate in the study. Saliva samples were collected from each player 30 min and 5 min before the start of the competition, at half time, and then again 5 and 30 min after the end of competition. A significant increase in cortisol (p=0.04) in response to playing the competition was observed including a significantly higher concentration 30 min after match as compared to half time (p=0.016). In contrast, changes in salivary α-amylase changes were irregular, but there was significant decline 5 min after end of match as compared to the 5 min before the beginning of match (p<0.019). No significant difference in total protein concentration was observed. Though salivary cortisol, α-amylase and total protein changes were observed concomitantly, but there no significant relationship between them. We conclude that participation in competition has an accumulative effect on salivary cortisol concentration, but this was not related changes in salivary α-amylase.
Euler-Lagrange Elasticity: Differential Equations for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.17004

Differential equations to describe elasticity are derived without the use of stress or strain. The points within the body are the independent parameters instead of strain and surface forces replace stress tensors. These differential equations are a continuous analytical model that can then be solved using any of the standard techniques of differential equations. Although the equations do not require the definition stress or strain, these quantities can be calculated as dependent parameters. This approach to elasticity is simple, which avoids the need for multiple definitions of stress and strain, and provides a simple experimental procedure to find scalar representations of material properties in terms of the energy of deformation. The derived differential equations describe both infinitesimal and finite deformations.

Euler-Lagrange Elasticity with Dynamics  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213138
Abstract: The equations of Euler-Lagrange elasticity describe elastic deformations without reference to stress or strain. These equations as previously published are applicable only to quasi-static deformations. This paper extends these equations to include time dependent deformations. To accomplish this, an appropriate Lagrangian is defined and an extrema of the integral of this Lagrangian over the original material volume and time is found. The result is a set of Euler equations for the dynamics of elastic materials without stress or strain, which are appropriate for both finite and infinitesimal deformations of both isotropic and anisotropic materials. Finally, the resulting equations are shown to be no more than Newton's Laws applied to each infinitesimal volume of the material.
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