OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Farzad Weisi” ,找到相关结果约430条。
Comparison of phonological awareness between children with cochlear implants and children with hearing aids
Farzad Weisi,Mohammad Rezaei,Gohar Lotfi,Ayub Valadbeigi
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Advanced phonological skills are important for the acquisition of reading skills. Children with hearing impairment have reading skills are weaker than others because of auditory inputs and due to the defect in phonological skills. The use of hearing aids and cochlear implants help to collect information on people who are hard of hearing.Material and Methods: This descriptive - analytic study was done on 12 children with cochlear implant and 12 children with hearing aids that was selected from second grades students of Tehran primary schools. Children's phonological performance was assessed by phonological subtests of Nama reading test and the data were analyzed using SPSS 16.Results: The results showed that the means of scores of children with cochlear implants in Rhyme task were significantly greater than the children with hearing aids (P=0.034). But in means of scores of Phone deletion and Nonword reading tasks were not significant different between two groups (P=0.919, P=0.670).Discussion: Cochlear implant with accessibility auditory inputs can facilitated the acquisition of phonological awareness skills in hearing loss children. But whereas the other language inputs such as sight and touch input helped to developing these skills, children with hearing aids too also can acquisition these skills.
Comparison of reading skills between cochlear implantation and normal hearing children in second and third grade elementary in Tehran
Farzad Weisi,Mohammad Rahim Shahbodaghi,Hosshang Dadgar,Ali Reza Moradi
Modern Rehabilitation , 2012,
Abstract: Background and Aim: Reading skill is necessary for academic achievement, that deaf children have problems in this skill due to hearing impairment. Use of cochlear implant can improve auditory inputs. The aim of this study was to investigate the reading skills of children with cochlear implants and comparing that with normal ones. Materials and Methods: This descriptive - analytic study was done on 24 children with cochlear implant and 24 normal ones that was selected from second and third grades students of Tehran primary schools. Children's reading performance was assessed by Nama reading test and the data were analyzed using T-test, linear regression and Pearson correlations. Results: The results showed that the means of reading scores of normal children were significantly greater than the cochlear implanted ones (P<0.01). Also, there was a significant relationship between reading skills and period of cochlear implant (P<0.01). Conclusion: Cochlear implanted children showed weaker performance in reading skills than normal ones due to less access to auditory and Phonological information. It seems that early surgery and cochlear implant before the age of language learning can be partially compensated reading defects of deaf children. Key words: Reading skills, Cochlear implantation, Second and third grade.
Study on Characteristics in the Removal Process of Ammonia Nitrogen and Nitrate Nitrogen by an Isolated Heterotrophic Nitrification-Aerobic Denitrification Strain Rhodococcus Sp.  [PDF]
Weisi Li
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.41B014
Abstract: Removal of ammonia nitrogen and nitrate nitrogen by an heterotrophic nitrification-aerobic denitrification strain is an economical and effective method. In this article, a kind of heterotrophic nitrification-aerobic denitrification strain which has aerobic denitrification and heterotrophic nitrification ability was selected, and then was identified as rhodococcus sp. by 16S rRNA sequencing analysis and morphological observation. After that, carbon source utilization and nitrification- denitrification activity of this strain in different C/N, initial nitrogen concentration were studied. In addition, the assimilation and denitrification activities of ammonia and nitrate were also researched under the condition of nitrate and ammonia coexisted in the solution. The results show that the strain can grow in sodium acetate, glucose, sodium succinate and sodium citrate solutions, and it can not survive in sodium oxalate, sucrose and soluble starch solutions. Initial concentration and C/N were important for nitrogen removal rate. This strain can completely remove nitrate/ammonia when nitrate/ammonia concentration was lower than 15 mg l-1/80 mg l-1. the C/N of 10 and of 12 were the optimum C/N ratio in the nitrate and ammonia removal process respectively. pH value rose up sharply in the denitrification process and it increased relatively slowly in the nitrification process, which shows that pH is one of the most important factor inhibiting the denitrification removal process. Nitrite concentration was much higher in denitrification process than in nitrification process. In addition, this strain gave priority to utilizing ammonia as nitrogen source when ammonia and nitrate coexisted in the solution.
Nitrogen Removal by a Fungal Aerobic Denitrifier of Penicillium Strain
Weisi Li,Chaocheng Zhao
Biotechnology , 2012,
Abstract: A kind of aerobic Penicillium that can remove ammonia, nitrite and nitrate was isolated through an improved bromothymol blue (BTB) selective culture medium method in this experiment and then the nitrogen removal by the strain was detailedly investigated. The results showed that this strain was able to make use of many kinds of organic carbon compounds as sole carbon source for the removal of the three types of inorganic nitrogen compounds but the way of removal was different. Ammonia was assimilated for forming cell components such as amino acid and protein, different from which, nitrite and nitrate were eliminated by the aid of dual assimilation and denitrification. When the three types of nitrogen coexist, the removal order was as follows: ammonia>nitrite>nitrate. Type of carbon source, initial nitrogen concentration and carbon nitrogen ratio (C/N) all had different effect on final solution pH, dry weight, nitrogen removal rate and removal ability of the strain. It was tested that non-polar organic carbon source containing -CH3 group like sucrose was inclined to be used by the strain. When sucrose was carbon source, the optimum C/N of ammonia, nitrite and nitrate removal were separate 4-6, 8-12 and 12-16. In addition, it was demonstrated with calculation that the removal abilities of the above mentioned three nitrogen of the strain were about 50, 60 and 90 mg g-1 respectively, showing its tremendous capability of nitrogen removal.
A Fixed Point Method for Convex Systems  [PDF]
Morteza Kimiaei, Farzad Rahpeymaii
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330189
Abstract: We present a new fixed point technique to solve a system of convex equations in several variables. Our approach is based on two powerful algorithmic ideas: operator-splitting and steepest descent direction. The quadratic convergence of the proposed approach is established under some reasonable conditions. Preliminary numerical results are also reported.
Landslide Hazard Mapping of Nagadhunga-Naubise Section of the Tribhuvan Highway in Nepal with GIS Application  [PDF]
Arjun Raj Pandey, Farzad Shahbodaghlou
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.66059
Abstract: The aim of this project was to prepare and study a hazard map of Nagadhunga-Naubise section of the Tribhuvan highway. This section lies in the Middle Mountain region of Nepal. For the preparation of the hazard map of the corridor three steps, initial study, field investigation, and data analysis and presentation were carried out. In the initial study, the collection of available data and review of the literature were done. The base map was then prepared from the topographical map. In the field investigation step, all information and maps prepared earlier in the initial study were verified by field check. In the final step, prepared and verified data were then analyzed for the hazard mapping. Topography (gradient, slope shape and slope aspect), geology, drainage and land-use were considered to be the major influencing factors in the slope stability. Pre-assigned hazard rating method was used for hazard mapping of the study area. The area was divided into equal facets. Then ratings of responsible factors to the hazard were assigned to each facet and overlaid based upon a predetermined rating scheme. Total estimated hazard was the sum of these ratings for each overlay. Hazard map was prepared by using three categories as low hazard, medium hazard and high hazard. The Geographic Information System (GIS) was the main tool for the data input, analysis, and preparing of the final hazard map. The hazard map showed the areas of different hazard potential classes of; “low” with 32% portion, “Medium” with 51%, and “high” with 17% portion.
Asymmetrical Gating with Application on Maneuvering Target Tracking
Farzad Hashemzadeh
Applied Computational Intelligence and Soft Computing , 2012, DOI: 10.1155/2012/670485
Abstract: A new asymmetrical gate with application in target tracking is proposed. Proposed gate has asymmetric shape that has large probability of target detection in the gate and has more advantages compared with elliptical gate. The gate is defined as the region in which the tracked target is expected to exist and just observation vectors in the gate are used as target detection. An analytical method to compute optimal size of gate is proposed and recursive estimation of asymmetric parameters of gate are studied. Comparison between proposed gate and conventional elliptical gate showed the efficiency of the proposed method in maneuvering target tracking applications and simulation results showed the proficiency of the proposed method. 1. Introduction Tracking is meant to be the estimation of the true values of specifications of target motion, such as the position and velocity, based on the n-dimensional observational vector by the sensors [1–3]. One-dimensional observation vectors are obtained in a direction-finding setup observing just the azimuth angle [4]. Two-dimensional observation vectors are obtained in optical sensors observing the azimuth angle and elevation angle, or in radars observing the range and azimuth angle. Historically, PDA (Probabilistic Data Association) [5], JPDA (Joint PDA) [6], and MHT (Multiple Hypothesis Tracking) [7–9] have drawn attention as target tracking methods in an environment in which false signals from objects other than the target such as clutter exist [10, 11]. In target tracking in such an environment, just the region is considered for each target in which the target is expected to exist at the next sampling time [12]. This region is called the gate. The observation data within the gate are used for tracking. Various gate shapes are conceivable, such as a rectangle, circle, and ellipse. However, it is not known which shape of gate is optimum. If the gate is enlarged, many observation vectors from clutter or objects other than the target fall within the gate, resulting in some difficulties in target tracking. On the other hand, if the gate is made smaller, there is a danger that the observation data from the target to be tracked may not fall within the gate. It is more desirable that the position of the observation vector detected from the target be closer to the center of the gate compared with location of the false signals in the gate [13]. A method of determining the in-gate probability has been proposed in [10]. In this paper, asymmetrical gaussian distribution is introduced. Cross-surface of asymmetrical gaussian
Tuberculosis and Traditional Medicine: Fighting the Oldest Infectious Disease Using the Oldest Source of Medicines
Farzad Kobarfard
Iranian Journal of Pharmaceutical Research , 2004,
Effects of extremely low-frequency electromagnetic field on fertility and heights of epithelial cells in pre-implantation stage endometrium and fallopian tube in mice
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To investigate the effects of extremely low-frequency electromagnetic field (ELF-EMF) on fertility and heights of epithelial cells in pre-implantation stage endometrium and fallopian tube in mice.Methods: Eighty female NMRI mice were randomly divided into 2 groups: control group was not exposed to EMF and experimental group was exposed to 4-hour EMF per day, 6 days a week for 2 weeks to 50 Hz, 0.5 mT EMF. Female mice in two groups were superovulated and mated with male mice over night. At the time of implantation, the blastocysts were obtained from the presumed pregnant mice with vaginal plug by flushing the uterus horns. The samples of uterus horns and fallopian tubes in two groups were taken and were processed for light microscopic studies. Results: The analysis of mean number of the flushed blastocysts in the EMF group showed significant decrease as compared with the control group (P<0.03). Light microscopic study showed that the height of fallopian tube epithelial cells was significantly increased in the EMF group as compared with the control group (P<0.001). However the height of endometrial epithelial cells in the EMF group showed insignificant increase as compared with the control group.Conclusion: The results indicate that ELF-EMF has detrimental effect on female reproductive system in mice by decreasing the number of flushed blastocysts and increasing the height of fallopian tube epithelial cells.
Measurement of Intracranial Pressure Through Ear Canal
Farzad Mobedshahi
Audiology , 1996,
Abstract: Transmission of intracranial pressure (ICP) to the perilymph is performed through cochlear aqueduct and also by other ways. Indirect measurement of perilymphatic pressure may be investigated by observing tympanic membrane (TM) displacement during stapedial reflex contraction, the tympanic membrane displacement (TMD) measurements. This non-invasive technique of examining intracranial pressure (ICP) can be effective in patients suffering abnormal cerebral pathology that could lead in Changes in ICP. It would also be effective in regular monitoring of hydrocephalus patients. This study has a look on this technique which has been reported to provide a reliable, non-invasive measure of ICP.

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