نتایج جستجو برای: shielding

تعداد نتایج: 9087  

Journal: :Nature Chemical Biology 2015

Journal: :TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 1973

Journal: :Optics express 2011
Carlos Dorronsoro Silvia Schumacher Pablo Pérez-Merino Jan Siegel Michael Mrochen Susana Marcos

An Allegretto Eye-Q laser platform (Wavelight GmbH, Erlangen, Germany) was used to study the effect of air-flow speed on the ablation of artificial polymer corneas used for testing refractive surgery patterns. Flat samples of two materials (PMMA and Filofocon A) were ablated at four different air flow conditions. The shape and profile of the ablated surfaces were measured with a precise non-con...

Journal: :Nature 1981

2017
Amir Bahadori Edward Semones Michael Ewert James Broyan Steven Walker

Passive radiation shielding is one strategy to mitigate the problem of space radiation exposure. While space vehicles are constructed largely of aluminum, polyethylene has been demonstrated to have superior shielding characteristics for both galactic cosmic rays and solar particle events due to the high hydrogen content. A method to calculate the shielding effectiveness of a material relative t...

2013
Nejc Mekis Dejan Zontar Damijan Skrk

BACKGROUND The aim of the study was to determine the influence of lead shielding on the dose to female breasts in conventional x-ray lumbar spine imaging. The correlation between the body mass index and the dose received by the breast was also investigated. MATERIALS AND METHODS Breast surface dose was measured by thermoluminescent dosimeters (TLD). In the first phase measurements of breast d...

2001
Raymond J. Abraham Marcos Canton Lee Griffiths

The 1H NMR spectra of a number of alkenes of known geometry were recorded in CDCl3 solution and assigned, namely ethylene, propene, 4-methylcyclohexene, 1,4-dimethylcyclohexene, methylene cyclohexane (in CFCl3 –CD2Cl2 at 153 K), 5-methylene-2-norbornene, camphene, bicyclopentadiene, styrene and 9-vinylanthracene. These results together with literature data for other alkenes, i.e. 1,3and 1,4-cyc...

Journal: :The Review of scientific instruments 2008
Shinya Handa Tomoyuki Haishi Katsumi Kose

A local radio frequency (rf) shielding consisting of a Cu plate and an LC balun circuit has been developed for a compact magnetic resonance imaging (MRI) system with a 0.3 T permanent magnet. Performance of the local rf shielding was evaluated using an artificial external noise source irradiating a human subject whose hand was inserted into the rf coil of the MRI system. Power spectra of the rf...

Journal: :The Journal of chemical physics 2013
Michał Jaszuński Michal Repisky Taye B Demissie Stanislav Komorovsky Elena Malkin Kenneth Ruud Piotr Garbacz Karol Jackowski Włodzimierz Makulski

The spin-rotation and nuclear magnetic shielding constants are analysed for both nuclei in the HCl molecule. Nonrelativistic ab initio calculations at the CCSD(T) level of approximation show that it is essential to include relativistic effects to obtain spin-rotation constants consistent with accurate experimental data. Our best estimates for the spin-rotation constants of (1)H(35)Cl are CCl = ...

2014
Paweł Siuda Joanna Sadlej

Calculations of NMR parameters (the absolute shielding constants and the spin-spin coupling constants) for 5(12), 5(12)6(2) and 5(12)6(4) cages enclathrating CH4, C2H6 and C3H8 molecules are presented. The DFT/B3LYP/HuzIII-su3 level of theory was employed. The (13)C shielding constants of guest molecules are close to available experimental data. In two cases (the ethane in 5(12) and the propane...

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