نتایج جستجو برای: activity system
تعداد نتایج: 3204837 فیلتر نتایج به سال:
abstract biometric access control is an automatic system that intelligently provides the access of special actions to predefined individuals. it may use one or more unique features of humans, like fingerprint, iris, gesture, 2d and 3d face images. 2d face image is one of the important features with useful and reliable information for recognition of individuals and systems based on this ...
Coronavirus-disease 19 (COVID-19) has rapidly become a global public health issue, and there is a desperate need for strategies of prevention, reduction, and treatment to halt the epidemic. The coronavirus affects the immune system, and individuals with a compromised immune system, such as those with diabetes, hypertension, obesity, are more susceptible to this virus. Lifestyle-related variable...
In this study, silica nanoparticles were used as support to prepare a new heterogeneous catalyst system for application in organic reactions. The reaction of silica nanoparticles with sodium 2-bromoethane-1-sulfonate resulted in the connection of a sulfonic acid group on the surface of silica nanoparticles (NSESA). The synthetic catalyst system was characterized using different microscopic and ...
In this work, the mean activity coefficients of KCl in the KCl+lactose +water system were determined using the potentiometric method. The electromotive force measurements were carried out on the galvanic cell without liquid junction of the type: Ag|AgCl|KCl (m), lactose (wt.%), H2O (1−wt.) %|K-ISE, in various mixed solvent systems containing 0, 5,7.5, 10 and 12.5 % mass fractions of lactose. Th...
هدف پژوهش حاضر، ارزیابی سیستم های اطلاعاتی مدارس یا به عبارتی فعالیتهای الکترونیکی موجود در مدارس مقطع متوسطه شهر شیراز در سال تحصیلی 1388-1389 است. روش این پژوهش توصیفی-پیمایشی است و محقق اقدام به تشریح، مطالعه و تجزیه و تحلیل وضعیتهای موجود در مدارس مذکور کرده است. به منظور دستیابی به یکسری نتایج از ابزارهای تحقیق نظیر پرسشنامه، مصاحبه ها و بررسی اسناد و مدارک استفاده شده است. نمونه آماری 80...
In this paper we investigate disk activity caused by accesses to large databases stored on modern storage systems. We show that read and write requests do not arrive according to a Poisson process but rather show a power law behaviour. Also, the aggregated rates of requests show signs of long range dependence through convincing 1/f noise in the power spectrum of the process. We then present a n...
The inhibitory effects of several steroids on G6PD activity using intact erythrocytes are reported. Incubation of whole blood with dehydroepiandrosterone (DHEA) resulted in 42% and 12% inhibition in the enzyme activity in the presence and absence of oxygen, respectively. Addition of epinephrine and/or aminophylline into the incubation medium caused further enzyme inhibition suggesting a po...
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