نتایج جستجو برای: free and noise

تعداد نتایج: 16922807  

2001

We consider discrete-time xed gain stochastic approximation processes that are de ned in terms of a random eld that is identically zero at some point . The boundedness of the estimator process is enforced by a resetting mechanism. Under appropriate technical conditions the estimator sequence is shown to converge to with geometric rate almost surely. This result is in striking contrast to classi...

Journal: :acta medica iranica 0
azam moslehi department of physiology, school of medicine, tehran university of medical sciences, tehran, iran. fatemeh nabavizadeh-rafsanjani department of physiology, school of medicine, tehran university of medical sciences, tehran, iran. mansoor keshavarz department of physiology, school of medicine, tehran university of medical sciences, tehran, iran. nematollah rouhbakhsh department of audiology, tehran university of medical sciences, tehran, iran. masoud sotudeh department of pathology, shariati hospital, school of medicine, tehran university of medical sciences, tehran, iran. ehsan salimi department of pharmacy, pharmacy school, tehran university of medical sciences, tehran, iran.

noise is considered as one of the most severe sources of environmental and work place constraints. noise effects on immune function, hormonal levels, cardiovascular and respiratory systems are well known. the aim of the study is to evaluate the effects of traffic noise on basal and stimulated gastric acid secretion. 48 healthy rats were divided into five traffic noise exposures (1, 7, 14, 21, 2...

Journal: مجله طب نظامی 2022

Background and Aim: Exposure to impact noise (short-term, high intensity) higher than permitted levels results in injury to the auditory system. Armed forces are one of the occupational groups exposed to these types of noises resulting from gunshots. In this study, relevant articles and research on the adverse effects of impact noise, hearing loss, and tinnitus in armed forces and effective con...

Journal: :iranian journal of medical sciences 0
mohammad hosseini-sharifabad department of biology and anatomical sciences, shahid sadoughi university of medical sciences, yazd, iran abdoreza sabahi department of anatomical sciences, isfahan university of medical sciences, isfahan, iran

in spite of the existing reports on behavioural and biochemical changes related to the cerebellum due to noise stress, not much is known about the effect of noise stress on the neuronal changes in the cerebellum. the present study aims at investigating the effects from one week noise exposure on granule cell number and purkinje cell volume within the neonate rat cerebellum. 15-day-old male wist...

Journal: :auditory and vestibular research 0
saeid aarabi department of audiology, school of rehabilitation sciences, iran university of medical sciences, tehran, iran farnoush jarollahi department of audiology, school of rehabilitation sciences, iran university of medical sciences, tehran, iran sajed badfar department of audiology, school of rehabilitation, arak university of medical sciences, arak, iran reza hosseinabadi department of audiology, school of rehablitation, tehran university of medical sciences, tehran, iran mohsen ahadi department of audiology, school of rehabilitation sciences, iran university of medical sciences, tehran, iran

background and aim: it will be discussed about five mechanisms in relation to speech in noise perception; including neural encoding and decoding, centrifugal pathways, pitch perception, asymmetric sampling in time and cognitive skills. these mechanisms are related to each other and each is important to recognize speech in noise. in this article, we have tried to rely on the latest studies to de...

Afsaneh Jalalian, Babak Karasfi, Khairulmizam Samsudin M.Iqbal Saripan Syamsiah Mashohor

Noise removal operation is commonly applied as pre-processing step before subsequent image processing tasks due to the occurrence of noise during acquisition or transmission process. A common problem in imaging systems by using CMOS or CCD sensors is appearance of  the salt and pepper noise. This paper presents Cellular Automata (CA) framework for noise removal of distorted image by the salt an...

جهانگیری, محمد , علی آبادی, محسن , گلمحمدی, رستم ,

Introduction: The Power plants are as the major industries that have a large number of workers, providing they health is important. Exposure to occupational noise is the pervasive physical agent in industries like power plants and may impact health and for safety status for people. Determination of the sources of noise in workplaces is important step in noise control plans. This study aimed to ...

Journal: :health scope 0
sedigheh atrkar roshan department of economic, university of alzahra, tehran, ir iran omran ahmadi department of sciences of occupational health, tarbiat modarres university, tehran, ir iran; department of sciences of occupational health, tarbiat modarres university, tehran, ir iran. tel: +98-9144241240

conclusions since traffic noise pollution is a high cost for tabriz residents, extensive preventive measures and comprehensive control programs by managers and city authorities as unavoidable necessities are suggested. the measures have to be taken by urban managers and decision-makers to reduce the health impact of traffic noise on tabriz residents. background noise pollution is one of the mos...

Journal: :فیزیک زمین و فضا 0
آرش متشرعی دانشگاه آزاد اسلامی، واحد علوم و تحقیقات- دانش آموخته حسین زمردیان دانشگاه آزاد اسلامی ، واحد علوم و تحقیقات- استاد حمیدرضا سیاهکوهی مؤسسه ژئوفیزیک دانشگاه تهران- استادیار محمود میرزایی دانشگاه اراک، استادیار

due to the remarkable advantages of wavelet transformation, this technique is now very common in gravity analysis. in this research the green’s function occurring in the poisson potential field theory is used to construct non-orthogonal, non-compact, continuous wavelets. this kind of wavelet is directly corresponded to upward continuation procedure. simple geometrical forward models such as sph...

ابراهیمی, محمد حسین, اعرابی, سعید, تقوی, سید محمدرضا, جعفری تالارپشتی, رقیه, عباسی, میلاد, فلاح مدواری, روح اله, قلع جهی, مریم, نصیری, پروین,

Introduction: Chronic occupational noise exposure may constitute a risk factor for cardiovascular disease for workers. The aim of this study was to investigate the relationship between occupational noise exposure and noise annoyance with blood pressure, serum cholesterol and triglyceride levels in workers of a textile industry. Material and Method: This cross-sectional study was carried out ...

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