نتایج جستجو برای: frequency of contact
تعداد نتایج: 21204068 فیلتر نتایج به سال:
Atopic dermatitis is the most common chronic inflammatory disease among children in industrialised countries. Many factors influence this disease in a negative way and contact allergy is one such factor. The aim of the study was to examine the frequency of contact allergy among children with the diagnosis atopic dermatitis. Contact allergy was found in 22/82 children (26.8%), the most common fr...
allergic rhinitis (ar) is one of the most common allergic disorders of child¬hood. in order to determine the frequency of ar among school-age children, a cross-sectional study was performed. one thousand, nine hundred and thirty-two children (931 boys and 1001 girls), aged 7-18 years, from 30 systematic randomly selected schools of tehran, the capital of iran, were investigated in this study. s...
background trauma is an inescapable part of sports competitions. it occurs more frequently in contact sports such as wrestling. objectives the purpose of this study was to determine the frequency of injury in greco-roman style wrestling competitions at national level. patients and methods this descriptive epidemiological research included 50 greco-roman style wrestlers who participated in natio...
abstract: in the present paper, we give a necessary and sufficient condition for contact cr-warped product to be contact cr-product in kenmotsu space forms.
Noise reduction has been accomplished in atomic force microscopy by applying a high frequency, low amplitude vibration to the cantilever while it is in contact with a surface. The applied excitation ~.200 kHz; ;1 nm! is acoustically coupled to the tip and dampens the resonance Q factors of the system. The applied frequency is well above the bandwidth of the acquisition system ~50 kHz!. We call ...
Introduction: Population ageing has turned its health impact into a critical problem. Iran will soon encounter such a crisis, but the capacity of social networks can be helpful in controlling this crisis. The present study was conducted to analyze the relationship of the social networks of the aged with health impact from the health and health services Utilization points of view. Method: In a s...
In this paper we present a detailed theoretical treatment of the 3-D temperature distribution induced by laser beam in photothermal displacement spectroscopy. We assume that a solid sample, which is deposited on a substrate and is in contact with a fluid, is irradiated by an intensity modulated cw laser source. By using a technique based on Greens function and integral transformations we find...
in this paper, design and construction of a tactile sensor for measuring contact-force is presented. mechanism of measuring contact-force in this tactile sensor is based on impedance changing of piezoelectric crystal and voltage of different points in circuit as a result of applying force on the crystal. by considering a specific point in the circuit and recording the changes of its voltage, ma...
vibration generated by vehicles during road transport has an important effect on the agricultural products damage process, particularly vegetable and fruit. modulus of elasticity is one of the most important mechanical properties of fruits and its variation can be described as one of the damage criteria during transportation. this research was conducted to evaluate the effects of vibration para...
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