東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Use of finite difference time-domain...

Chen, Jinyuan.

FindBook

Google Book

Amazon

博客來

Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse./
作者:	Chen, Jinyuan.
面頁冊數:	191 p.
附註:	Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1380.
Contained By:	Dissertation Abstracts International51-03B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9025362

Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse.
Chen, Jinyuan.

Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse. - 191 p.

Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1380.

Thesis (Ph.D.)--The University of Utah, 1990.

The three-dimensional finite-difference time-domain (FDTD) method has been used to calculate local, layer-averaged and whole-body averaged specific absorption rates (SARs) and internal radio-frequency (RF) currents in an anatomically-based model of a human for plane-wave (far-field) exposures from 20 to 100 MHz and for spatially variable electromagnetic fields of a parallel-plate applicator representative of RF dielectric heaters used in industry (near-field). The calculated results are in agreement with the experimental data of Hill and others. While the existence of large foot currents has been known previously, substantial RF currents (600-800 mA) induced over much of the body are obtained for E-polarized fields suggested in the 1982 ANSI RF safety guideline.Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse.
LDR:03616nmm 2200301 4500 001 1849473
005 20051203075652.5
008 130614s1990 eng d
035 $a (UnM)AAI9025362
035 $a AAI9025362
040 $a UnM $c UnM
100 1 $a Chen, Jinyuan. $3 1937429
245 1 0 $a Use of finite difference time-domain method with an anatomically-based model of a human for exposures to far-near-electromagnetic fields and electromagnetic pulse.
300 $a 191 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1380.
500 $a Chair: Om P. Gandhi.
502 $a Thesis (Ph.D.)--The University of Utah, 1990.
520 $a The three-dimensional finite-difference time-domain (FDTD) method has been used to calculate local, layer-averaged and whole-body averaged specific absorption rates (SARs) and internal radio-frequency (RF) currents in an anatomically-based model of a human for plane-wave (far-field) exposures from 20 to 100 MHz and for spatially variable electromagnetic fields of a parallel-plate applicator representative of RF dielectric heaters used in industry (near-field). The calculated results are in agreement with the experimental data of Hill and others. While the existence of large foot currents has been known previously, substantial RF currents (600-800 mA) induced over much of the body are obtained for E-polarized fields suggested in the 1982 ANSI RF safety guideline.
520 $a The FDTD method has also been used for simulating Annular Phased Array (APA) of dipole antennas for hyperthermia of deep-seated tumors. Anatomically-based models based on two different regions of the human body (14,417 and 13,133 cells) were used to calculated the SAR distributions with a resolution of 1.31 cm. Annular-phased arrays of eight dipole antennas couple to the human body through either a homogeneous or a tapered water bolus with air assumed outside the ring of dipoles. The objective of the calculations was to focus the energy to a couple of assumed tumor sites in the liver or the prostate. The geometrical optics approximation and principle of focused arrays were used to estimate the phases for individual dipoles to focus the electromagnetic energy into the tumor and its surrounding. Considerably focused power distributions with SARs on the order of 100 W/Kg for input powers of 400-700 W have been obtained for assumed tumor sites in the liver and the prostate using tapered boluses and optimized magnitudes and phases of power to the various dipoles.
520 $a Lastly the FDTD technique is used to calculate the internal fields and the induced current densities in anatomically based models of a human using 5,628 or 45,024 cubical cells of dimensions 2.62 or 1.31 cm, respectively. The total induced currents for the various sections of the body and the specific absorptions (SA) for several organs are given for a few representative EMPs. Peak currents approximately 3-4 A/(KV/m) are obtained for sections of the thighs and knees for times on the order of 11-12 ns after the onset of the pulse. It is also observed that the predominant components of the induced currents are at frequencies close to 40-45 MHz because of the resonance absorption of the anatomically-based model representing a 1.75-m-tall human standing on a ground plane.
590 $a School code: 0240.
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Physics, Radiation. $3 1019212
650 4 $a Health Sciences, Radiology. $3 1019076
690 $a 0541
690 $a 0756
690 $a 0574
710 2 0 $a The University of Utah. $3 1017410
773 0 $t Dissertation Abstracts International $g 51-03B.
790 1 0 $a Gandhi, Om P., $e advisor
790 $a 0240
791 $a Ph.D.
792 $a 1990
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9025362