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Search Results: 1 - 10 of 1239 matches for " Mahdi Bakhshaee "
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Lymphoid papillary hyperplasia in palatine tonsils
Mahdi Bakhshaee,Naser Tayyebi,Mahdi Mouzooni,Navid Noorizadeh
Iranian Journal of Otorhinolaryngology , 2008,
Abstract: Introduction: Lymphoid papillary hyperplasia is a rare benign lesion of the palatine tonsils with a papillary surface configuration so atypical which could clinically be mistaken for a carcinoma or papilloma. Case report: The following report describes a 7-year-old girl with papillomatous lesions of both palatine tonsils.
Investigation of Tinnitus Characteristics in 36 Patients with Subjective Tinnitus with Unknown Etiology
Mahdi Bakhshaee,Mohammad mahdi Ghasemi,Ehsan Khadivi,Saman Rezaei
Audiology , 2006,
Abstract: Background and Aim: Tinnitus represents the perception of sound without an external stimulus. The prevalence of tinnitus ranges from 3% to 30%. In most cases its etiology is unknown. Tinnitus can be classified as pulsatile or nonpulsatile. Nonpulsatile form is the most common form and almost exclusively subjective in nature. There is a range of condition attributed to nonpulsatile high frequency tinnitus (acoustic neuroma, Meniere’s disease, ototoxic agents, and noise exposure, etc). There are many studies about form, site, loudness, and frequency of tinnitus and how it can affect the quality of patient life. Materials and methods: This was a descriptive and analytic study. Thirty-six patients (23 men and 13 women) with mean age 53.1 year old with subjective tinnitus evaluated in Pezhvak audiometric clinic in Mashhad.The data consisting of age sex, loudness, frequency form and site of tinnitus. Evaluation of effects of tinnitus on the quality of life and habits was performed with a tinnitus questionnaire (TQ). Results: Tinnitus was unilateral in 64% of cases. The right site was more common. Mean pitch was 7.03 kHz and average loudness was 3.8 dB SPL. SDS was in normal range in all of patients. There was a high frequency sensory neural hearing loss (above the 4 kHz) in most of the patients. The greatest score (60.3%) of TQ related to intrusiveness aspect. Sleep disorder has the lowest score (39/3%). Global score was 52.4%. Conclusion: Nonpulsatile subjective tinnitus has a broad range of etiology with unknown mechanism in most cases and without any history of underlying disease in a large group of patients. This symptom mostly involves the patients` lifestyle that is intrusiveness aspect in comparison with the other aspects including sleep, hearing and somatic complaints. There is no cure for most patient and more studies are needed in the future.
Audiometry and ossicular condition in chronic otitis media
mohsen Rajati Haghi,Mohamad Mahdi Ghasemi,Mehdi Bakhshaee,Atefeh Taghati
Iranian Journal of Otorhinolaryngology , 2009,
Abstract: Introduction: Ossicular chain injury is one of the most common causes of hearing loss in chronic otitis media (COM). Although definite diagnosis of ossicular discontinuity is made intraoperatively, preoperative determination of ossicular chain injury will help the surgeon decide about reconstruction options and hearing prognosis of the patient. In this study we compared preoperative pure tone audiometry (PTA) findings of COM patients with the ossicular condition determined during surgery. Materials and Methods: 97 Patients with COM who underwent ear surgery for the first time were included in the study. A checklist of preoperative clinical findings, audiometric parameters and intraoperative findings was filled out for all patients. Results: Mean amount of Air-Bone Gap (ABG), Bone Conduction threshold (BC) and Air Conduction threshold (AC) of 97 Patients were 35.17, 13.13 and 48.30 respectively. In ears with or without cholesteatoma, granulation tissue, or otorrhea, mean of AC, BC, and ABG were not significantly different. In ossicular erosion and discontinuity (OD), mean of AC and BC thresholds increased significantly but ABG didn’t change significantly. Conclusion: According to the results of this study, in preoperative assessment of COM patients to predict ossicular condition we recommend considering AC, BC and ABG levels together instead of using ABG alone as is routine in our daily practice.
Tip Graft and Columellar Strut Using Dorsal Osseocartilaginous Hump
Ebrahim Karimi,Mehdi Bakhshaee
Iranian Journal of Medical Sciences , 2010,
Abstract: Background: Although, different grafts are used for nasal tipplasty in cases with under projected or ill defined tip, the selectionof a graft material, which provides sufficient amount oftissue with least donor site morbidity and low recipient sitecomplication is challenging. The objectives of the presentstudy were to examine the usefulness of cartilaginous dorsumas a proper material for tip graft, and to introduce the cartilaginousdorsum as an acceptable material for columellar strut.Methods: Fifty six (18 males and 38 females) patients wereoperated for augmentation tip plasty and hump reduction from2004 to 2008. The tailored cartilaginous or ostecartilaginousdorsum was used as a tip graft or columellar strut in 35 and 21cases, respectively. The cartilaginous framework was exposedusing open or close rhinoplasty approach in 41 and 15 cases,respectively. The patients were followed for 12- 36 months.Cosmetic outcomes and patients' satisfaction were obtainedusing qualitative measures.Results: The percentage of patients with very improved, improved,unchanged or unacceptable aesthetic outcome were39.29%, 50%, 3.57% and 7.14%, respectively. Moreover, thepercentages of very satisfied, satisfied, indifferent and unsatisfiedpatients were 66%, 18%, 9%, and 7%, respectively.Conclusion: The procedure provides a well-defined nasal tipwith no evidence of bifidity, angularity, or cartilage graft visibilityand displacement. The use of dorsal osteocartilaginousgraft offers outstanding advantages including ease of harvest,mould, fix, and low resorption.
An Airway which Facilitates intubation with a Fiberoptic Laryngoscope
Ali Reza Bameshki,Mehdi Bakhshaee
Iranian Journal of Otorhinolaryngology , 2010,
Towards Economic Single-Phase Motor  [PDF]
Mahdi Alshamasin
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.59058

Studying of operation balance in single-phase induction motors is an issue of interest due to the need for reducing the power consumption and increasing the motors’ life. The paper focuses on improving the motor performance by balancing the stator phase operation for the most common-used connection diagrams of single-phase capacitor-run induction motors (SPCRIMs) and three-phase induction motors (TPIMs) operating from single-phase supply (SPS). Therefore, a mathematical model is used to balance the motor operation by varying the frequency supply voltage. Characteristics of balancing parameters are investigated, various methods of motor balancing are presented and comparisons were done among these balancing methods.

Periorbital Ecchymosis and Subconjunctival Hemorrhage following Ear Surgery
Mohsen Rajati,Mehdi Bakhshaee,Kamran Khazaeni
ISRN Otolaryngology , 2013, DOI: 10.1155/2013/791068
Abstract: Objective. To evaluate the occurrence of two periorbital complications of surgery for Chronic Suppurative Otitis Media (CSOM) and discuss the potential pathophysiologic mechanisms. Materials and Methods. This is a retrospective review of the CSOM surgeries performed between Oct, 2005, and Jan, 2011, in our hospital. The early postoperative conditions of the patients were scrutinized to identify periorbital ecchymosis and subconjunctival hemorrhage. Results. Eight cases out of 756 patients were noted to have periorbital ecchymosis, and two of the patients also had simultaneous subconjunctival hemorrhage. All cases in which the complications occurred had undergone tympanoplasty, and in three patients mastoidectomy had also been performed. The age of the affected patients ranged from 24 to 70 years old. In all of them the condition ensued the day after the surgery and became better within 5 to 10 days. Complete recovery took approximately 1 month. Conclusion. Periorbital ecchymosis and subconjunctival hemorrhage are rare but safe complications of ear surgeries. The conditions are self-limiting and no management is necessary. 1. Introduction Chronic Suppurative Otitis Media (CSOM) is a fairly common disease, and it is usually managed with surgery. In most otology wards the most common surgical procedures are those performed on patients with CSOM and, like any other medical intervention, complications can happen. These complications include those related to anesthesia, as well as otologic and intracranial complications. Problems related to the skin and wound healing such as infection, hematoma, and dehiscence are considered minor complications in CSOM surgeries. There have been various case reports on rare, out of the ordinary mishaps, in these surgeries. Here, we describe periorbital ecchymosis with or without subconjunctival hemorrhage as a rather rare complication of ear surgeries. Although a familiar condition in nose and sinus operations to the extent of our knowledge, periorbital problems in otologic surgeries were first brought up by Rudnick et al. who described 4 cases of periorbital edema and cellulitis in 97 patients with cochlear implants [1]. Herein, we discuss periorbital ecchymosis, which is a more complex condition compared to edema and/or erythema of the orbital area. 2. Materials and Methods This is a retrospective review of the occurrence of periorbital ecchymosis and/or subconjunctival hemorrhage as a complication following ear surgeries including tympanoplasty with or without mastoidectomy in our university hospital, which is a tertiary
Improvment of Free Convection Heat Transfer Rateof Rectangular Heatsink on Vertical Base Plates  [PDF]
HamidReza Goshayeshi, Mahdi Fahiminia, Mohammad Mahdi Naserian
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.34064
Abstract: In this paper, the laminar heat transfer of natural convection on vertical surfaces is investigated. Most of the studies on natural convection have been considered constantly whereas velocity and temperature domain, do not change with time, transient one are used a lot. Governing equations are solved using a finite volume approach. The convective terms are discretized using the power-law scheme, whereas for diffusive terms the central difference is employed. Coupling between the velocity and pressure is made with SIMPLE algorithm. The resultant system of discretized linear algebraic equations is solved with an alternating direction implicit scheme. Then a configuration of rectangular fins is put in different ways on the surface and heat transfer of natural convection on these surfaces without sliding is studied and finally optimization is investigated.
A New Method of Voiced/Unvoiced Classification Based on Clustering  [PDF]
Mojtaba Radmard, Mahdi Hadavi, Mohammad Mahdi Nayebi
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24048
Abstract: In this paper, a new method for making v/uv decision is developed which uses a multi-feature v/uv classification algorithm based on the analysis of cepstral peak, zero crossing rate, and autocorrelation function (ACF) peak of short-time segments of the speech signal by using some clustering methods. This v/uv classifier achieved excellent results for identification of voiced and unvoiced segments of speech.
Turbidimetric Determination of Hydrocarbon Contamination in Passaic River Sediments and Refinery Polluted Soils  [PDF]
Mahmood Mahdi Barbooti
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.27104
Abstract: A rapid method is described for the determination of petroleum hydrocarbons in soil samples. The method is based on the extraction of hydrocarbons by a solvent and the treatment of the solution with an aqueous solution of a surfactant to release the hydrocarbons to the water phase in the form of a stable emulsion. The emulsion is then utilized to measure the hydrocarbon content by turbidimetry. The effects of various operating parameters including the surfactant solution composition and time of extraction and time of mixing with the releasing solution are investigated. The stability of the emulsion was improved in acid environment containing and electrolyte. The turbidity values (T) were related with hydrocarbon concentration in the extract (C) by the following equation. Turbidity = 2.75 C + 205.7. With R2 = 0.9929. The soil hydrocarbon content (SHC) measured in µg/g can then be calculated using the formula: SHC = [Extract Vol. (mL) x C]/Sample Wt (g). The results correlated well with the results of total hydrocarbons in soils determined by standard methods. The method was applied for the estimation of hydrocarbons in Passaic river sediments taken from various locations and depths. For field work the method was used to supply data on the hydrocarbon contamination of soil samples taken within an oil refinery and a monitoring well drilled within heavy hydrocarbon waste dumping location.
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