نتایج جستجو برای: fecu particles
تعداد نتایج: 156375 فیلتر نتایج به سال:
The aim of this paper is to determine the maximum values of the track length (Lmax) of alpha particles in Nuclear Track Detector (type CR-39) using a new method by taking the relation between the etching time and the diameter square of alpha particle with different energies at constant bulk etch rate VB (1.45 μm/hr) by using TRACK_TEST program from Brun et al. function and Yu et al. function. U...
In theoretical physics, paradoxes are good. That’s paradoxical, since a paradox appears to be a contradiction, and contradictions imply serious error. But Nature cannot realize contradictions. When our physical theories lead to paradox we must find a way out. Paradoxes focus our attention, and we think harder. When David Gross and I began the work that led to this Nobel Prize [1, 2, 3, 4], in 1...
Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart-hydrogen--is one of the most precisely investigated and best understood systems in physics research. High-resolution comparisons of both systems provide sensitive tests of CPT symmetry, which is the most fundamental symmetry in the Standard Model of elementary particle physics. Any measured difference wou...
We examined the induction of HPRT mutations in CHO cells exposed to low fluences of (238)Pu alpha particles from a specially constructed irradiator. The dose-response relationship was linear over the dose range of 5 cGy-1.2 Gy. However, unexpected sensitivity, leading to a significantly higher frequency of mutations than would be predicted by a back extrapolation from the data for higher doses,...
particulate matters commonly found dispersed in the atmosphere are composed of a large variety of substances. dustfall is the usual index of particles in the size range greater than 10 m. two semi automated so2 sampling units were installed in tehran university campus (from 21 january 1973 to 22 dec. 1974) and gheitarieh area (from 23 august to 23 oct. 1974) hydrogen peroxide method was used fo...
background preventing the seasonal or pandemic outbreak of influenza can be powerful and cost-effective. objectives in this study, we constructed a novel virus-like particle (vlp) platform that contains two hemagglutinin (ha) subtypes and evaluated immunogenicity of constructed vlp in mice. materials and methods this recombinant candidate vaccine model resulted in the expression of two has of h...
purpose: to evaluate the effect of fullerene on chemical properties of naphazoline drug in water by density functional theory (dft) methods. materials and methods: naphazoline belongs to the imidazoline class of sympathomimetics. the present study on naphazoline drug and its fullerene connected form were carried out using computerized calculations of gaussian program in b3lyp/6-31g leve...
background and aims. incorporation of nano-particles to orthodontic bonding systems has been considered to prevent enamel demineralization around appliances. this study investigated cytotoxicity of transbond xt adhesive containing 1 wt% titanium dioxide (tio2) nano-particles. materials and methods. ten composite disks were prepared from each of the conventional and tio2-containg composites and ...
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