نتایج جستجو برای: x rays and radioactivities
تعداد نتایج: 16920893 فیلتر نتایج به سال:
Background & Aim: Inferior heel pain is a common complaint in patients referred to orthopedic clinics. Etiology of this pain is unknown, but one of the suggestible causes is heel spur. The present descriptive comparative cross-sectional study was undertaken to evaluate the prevalence of heel spur in patients with painful heels and compare it with general population in order to determine spu...
abstract in this thesis at first we comput the determinant of hankel matrix with enteries a_k (x)=?_(m=0)^k??((2k+2-m)¦(k-m)) x^m ? by using a new operator, ? and by writing and solving differential equation of order two at points x=2 and x=-2 . also we show that this determinant under k-binomial transformation is invariant.
The ISM of active galaxy centers is exposed to a combination of cosmic ray, FUV and X-ray radiation. We apply PDR models to this ISM with both 'nor-mal' and highly elevated (5 × 10 −15 s −1) cosmic-ray rates and compare the results to those obtained for XDRs. Our existing PDR-XDR code is used to construct models over a 10 3 − 10 5 cm −3 density range and for 0.16-160 erg s −1 cm −2 im-pingent f...
Photosystem II uses metal ions to oxidize water to form O2. Two recent papers employ the new technique of serial femtosecond crystallography utilizing X-ray free-electron lasers and nanocrystals to obtain initial structures of intermediate states of photosystem II catalysis at the site of oxygen production.
Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse Source at the Stanford Linear-Accelerator Center we solved ...
introduction lead-based shields are the most widely used attenuators in x-ray and gamma ray fields. the heavy weight, toxicity and corrosion of lead have led researchers towards the development of non-lead shields. materials and methods the purpose of this study was to design multi-layered shields for protection against x-rays and gamma rays in diagnostic radiology and nuclear medicine. in this...
The fission rate during JCO criticality accident is estimated from fission-product (FP) radioactivities in a uranium solution sample taken from the preparation basin 20 days after the accident. The FP radioactivity data are taken from a report by JAERI released in the Accident Investigation Committee. The total fission number is found quite dependent on the FP radioactivities and estimated to b...
The 1996 centenary of W. K. Röntgen’s discovery of x rays celebrated the penetrating visions offered by these “strange rays.” Aside from their ubiquitous application to imaging the interior structure of visually opaque systems, x rays continue to have important applications in elucidating the geometrical and electronic structure of matter. In addition to the synchrotron radiation facilities, co...
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