نتایج جستجو برای: shielding tensor

تعداد نتایج: 52172  

2011
Matti Hanni

This thesis presents computational studies of both the static and dynamic parameters of the nuclear magnetic resonance (NMR) spectroscopy of gaseous xenon. First, state-of-the-art static magnetic resonance parameters are computed in small xenon clusters by using methods of quantum chemistry, and second, time-dependent relaxation phenomena are investigated via molecular dynamics simulations at d...

2004
Lothar O. Hoeft

The relationship between surface transfer impedance and stirred mode chamber shielding effectiveness proposed by Eicher and Boillot has been simplified. This simplified relationship was used to compare the measured stirred mode chamber shielding effectiveness of nine shielding artifacts with the shielding effectiveness of the same samples calculated from transfer impedance measurements made at ...

Journal: :journal of biomedical physics and engineering 0
a r farajollahi f bouzarjomehri m kiani

normal 0 false false false en-us x-none fa introduction: in radiation therapy centers across iran, protection of normal tissues is usually accomplished by either cerrobend or lead block shielding. in this study, the influence of these two shielding methods on central axis dose distribution of photon beam a cobalt unit was investigated in clinical conditions. materials and methods: all measureme...

2014
Renate Wolf geb. Reisenauer Gesine Dreisbach Mark W. Greenlee Roland Thomaschke Johanna Bogon Svenja Böttcher

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1998
C. Orzel S. D. Bergeson S. Kulin S. L. Rolston

Using 40 ns laser pulses, we probe the real-time dynamics of ultracold ionizing collisions in metastable xenon. We time resolve both shielding and enhancement effects, and observe the production of Xe2 molecular ions through associative ionization. We estimate the rate of molecule formation in excited-state collisions, and directly measure the role of both flux enhancement and excited state sur...

2007
G. Fehrenbacher E. Kozlova

Shielding calculations are done for the following scenario: a graphite target is hit by a 1 GeV/u U beam with an intensity of 10 particles per second. The target is a wheel with radius of 22.5 cm and it is subdivided into three rings, each 16 mm wide, with thicknesses of 21.6, 32.4 and 43.2 mm, corresponding to 4, 6, 8 g/cm [3]. For a conservative case the thickest part of the target with a thi...

‎‎The tensor product is the fundemental ingredient for extending one-dimensional techniques of filtering and compression in signal preprocessing to higher dimensions‎. ‎Woven frames play ‎ a crucial role in signal preprocessing and distributed data processing‎. Motivated by these facts, we have investigated the tensor product of woven frames and presented some of their properties. Besides...

Journal: :iranian journal of science and technology (sciences) 2011
m. m. ebrahimi

the ordinary tensor product of modules is defined using bilinear maps (bimorphisms), that are linear in eachcomponent. keeping this in mind, linton and banaschewski with nelson defined and studied the tensor product in an equational category and in a general (concrete) category k, respectively, using bimorphisms, that is, defined via the hom-functor on k. also, the so-called sesquilinear, or on...

Journal: :bulletin of the iranian mathematical society 0
s. ‎mallick‎ department of mathematics‎, ‎chakdaha college‎, ‎p‎. ‎o‎. ‎chakdaha‎, ‎dist-nadia‎, ‎west bengal‎, ‎india. p. zhao department of applied mathematics‎, ‎nanjing university of science and technology‎, ‎nanjing 210094‎, ‎p‎. ‎r‎. ‎china. u. c. de department of pure mathematics‎, ‎university of calcutta‎, ‎35‎, ‎b‎. ‎c‎. ‎road‎, ‎kolkata 700019‎, ‎west bengal‎, ‎india.

‎the object of the present paper is to study spacetimes admitting‎ ‎quasi-conformal curvature tensor‎. ‎at first we prove that a quasi-conformally flat spacetime is einstein‎ ‎and hence it is of constant curvature and the energy momentum tensor of such a spacetime satisfying‎ ‎einstein's field equation with cosmological constant is covariant constant‎. ‎next‎, ‎we prove that if the perfect...

2017
Yucheng Gao Wei Zhao Qing Wang Kaifeng Qu He Li Haiming Shao Songling Huang

Applying shielding coils is a practical way to protect current transformers (CTs) for large-capacity generators from the intensive magnetic interference produced by adjacent bus-bars. The aim of this study is to build a simple analytical model for the shielding coils, from which the optimization of the shielding coils can be calculated effectively. Based on an existing stray flux model, a new a...

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