نتایج جستجو برای: tlv(threshold limit value)
تعداد نتایج: 903124 فیلتر نتایج به سال:
سابقه وهدف:از آنجایی که دندان پزشکان بخاطر استفاده از آمالگام در ریسک مسمومیت با جیوه هستند. این مقاله به منظور بررسی سطح جیوه خون دانشجویان، دستیاران و اساتید دندان پزشکی که با آمالگام کار می کنند و در معرض تماس با جیوه هستند ترتیب یافت تا چگونگی وضعیت بهداشت کار باامالگام بررسی گردد. موادو روش ها: این مطالعه بصورت کوهورت تاریخی طراحی شد و 50 نفر در گروه مورد مطالعه و 50 نفر در گروه غیر مواجهه...
in this paper are present the results of measurements of magnetic induction at some locationsin city bor (the east serbia) dating from the household electric devices and transformer stations suited near the residental areas. stress is on the extremely low frequent electromagnetic radiation from transformer stations and other high voltage instalations in urban areas. risk of the extremely low fr...
having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...
We study solvability for a model elliptic pseudo-differential equation with an additional integral condition in Sobolev–Slobodetskii spaces certain conical domains Euclidean space. . Using the wave factorization symbol we construct solution this boundary value problem and behavior of when parameters cones tend to their extremal values. It was shown that such need besides presented condition.
We report the first observation of Υ(2S) → ηΥ(1S), with branching fraction B = (2.1 −0.6 (stat.)± 0.3 (syst.))×10−4 and statistical significance 5.3σ. Data were acquired with the CLEO III detector at the CESR e+e− symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 10−4 are B[Υ(2S) → π0Υ(1S)] < 1.8, B[Υ...
Background and Objectives: Sound of motorcycles plays an important role in noise pollution in big cities. This is due to the lack of national law or standards to control the noise of domestic and also imported motorcycles. This study tries to introduce a practical limit value in different stage of motorcycle life cycle by assessing their noise pollution. Materials and Methods: First the motorcy...
We consider a dynamic programming problem with arbitrary state space and bounded rewards. Is it possible to define in an unique way a limit value for the problem, where the “patience” of the decision-maker tends to infinity ? We consider, for each evaluation θ (a probability distribution over positive integers) the value function vθ of the problem where the weight of any stage t is given by θt,...
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