نتایج جستجو برای: Shielding Disk

تعداد نتایج: 66073  

Introduction: Intraoperative electron radiotherapy (IOERT) is an IORT technique in which electron beams with different nominal energies are used for irradiation of microscopic residual of tumor bed after surgery. Application of a shielding disk, which is positioned under the target volume, for protecting the normal tissues such as pectoral muscle, lung, and heart is one of the a...

Ali Neshasteh-Riz Fereshteh Koosha, Ghazale Mansorian Mostafa Robatjazi, Reza Paydar,

Introduction: One of the treatment choices in breast cancer is Intra operative electron beam radiation therapy (IOERT). Due to high dose delivery in this procedure, shielding disk is used to protect organs at risk (OARs). In this study, we evaluate the OARs dose in the breast IOERT using Monte Carlo simulation with and without shielding disk in RANDO phantom. Material and Methods: Simulation ...

1995
Giovanni Modanese

Under special conditions (Meissner-effect levitation in a high frequency magnetic field and rapid rotation) a disk of high-Tc superconducting material has recently been found to produce a weak shielding of the gravitational field. We show that this phenomenon has no explanation in the standard gravity theories, except possibly in the non-perturbative Euclidean quantum theory. 04.20.-q Classical...

2014
Mara Severgnini Mario de Denaro Marina Bortul Cristiana Vidali Aulo Beorchia

Intraoperative electron radiation therapy (IOERT) cannot usually benefit, as conventional external radiotherapy, from software systems of treatment planning based on computed tomography and from common dose verify procedures. For this reason, in vivo film dosimetry (IVFD) proves to be an effective methodology to evaluate the actual radiation dose delivered to the target. A practical method for ...

Journal: :Acupuncture & electro-therapeutics research 2007
Maria Syldona

Several studies have demonstrated detrimental effects of cellular phone radiation on in-vitro biological systems. This article introduces a novel in-vitro method for demonstrating conformational changes in human DNA induced by a 5 minute exposure to cellular phone radiation emitted by an actual contemporary cellular phone. Dynamic changes in DNA conformation was determined in real-time by measu...

2003
Daniel Proga

We summarize recent developments in modeling of mass outflows from accretion disks in AGN. We illustrate how the hydrodynamical and magnetohydrodynamical wind structures revealed in numerical simulations relate to observations. Important results from the numerical simulations include: no shielding from X-rays is needed to radiatively launch a wind from the inner disk; shielding is needed to acc...

2006
E. D. Young

Introduction: Self shielding by CO in the early stages of evolution of the solar protoplanetary disk may be the explanation for the anomalous array of O/O and O/O in primitive solar system materials (the slope-1 line on a plot of δO vs. δO) [1, 2]. Thorough evaluation of the various hypotheses that CO photochemistry is the source of the ∆O variability in the solar system requires detailed astro...

1978
DAVID JOSEPH FRANKEL Mario Rabinowitz

Flux trapping and shielding experiments were carried out on Pb, Nb, Pb-Bi, Nb-Sn, and Nb-Ti samples of various shapes. Movable Hall probes were used to measure fields near or inside the samples as a function of position and of applied field. The trapping of transverse multipole magnetic fields in tubular samples was accomplished by cooling the samples in an applied field and then smoothly reduc...

1999
Matt Welsh

We present Tigris, a high-performance computation and I/O substrate for clusters of workstations, implemented entirely in Java. Tigris automatically balances resource load across the cluster as a whole, shielding applications from asymmetries in CPU, I/O, and network performance. This is accomplished through the use of a data ow programming model coupled with a workbalancing distributued queue....

2000
Matt Welsh David E. Culler

We present Tigris, a high-performance computation and I/O substrate for clusters of workstations that is implemented entirely in Java. Tigris automatically balances resource load across the cluster as a whole, shielding applications from asymmetries in CPU, I/O, and network performance. This is accomplished through the use of a dataflow programming model coupled with a work-balancing distribute...

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