نتایج جستجو برای: thermoacoustic refrigerator

تعداد نتایج: 3383  

Journal: :TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 2012

2011
G. K. Zhu M. Popović

Microwave radar and microwave-induced thermoacoustic technique exploit the contrast in the permittivity and conductivity between malignant and healthy tissue. They have emerged as promising techniques for detecting breast cancers. This paper compares the imaging capability of these techniques in the presence of homogeneous and heterogeneous breast tissue. Relying on the data from the finite-dif...

Journal: :Medical physics 2015
Olumide Ogunlade Paul Beard

PURPOSE Thermoacoustic imaging at microwave excitation frequencies is limited by the low differential contrast exhibited by high water content tissues. To overcome this, exogenous thermoacoustic contrast agents based on gadolinium compounds, iron oxide, and single wall carbon nanotubes have previously been suggested and investigated. However, these previous studies did not fully characterize th...

2014
J. Lee K. Y. Cho K. T. Lee Janghee Lee Kwang-Yun Cho Ki-Tae Lee

This paper will present the structure of the new system, the control scheme and its performance test results. In this new system, the damper in the conventional refrigerator is replaced by an additional cooling fan Thus, it uses two cooling fans: one (F-fan) is to provide cooled air for freezing compartment (F-compartment) and the other (R-fan) is for refrigerating compartment (R-compartment), ...

2009
Linh V. Nguyen LINH V. NGUYEN

We present a family of closed form inversion formulas in thermoacoustic tomography in the case of a constant sound speed. The formulas are presented in both time-domain and frequency-domain versions. As special cases, they imply most of the previously known filtered backprojection type formulas.

Journal: :Physical review 2022

A recent study [H. Hao and F. Semperlotti, Phys. Rev. B 104, 104303 (2021)] investigated the dynamic behavior of an infinite one-dimensional (1D) thermoacoustic waveguide (TAWG) illustrated its ability to sustain nonreciprocal near zero-index sound propagation behavior; these properties can be very beneficial in design acoustic devices, including diodes, amplifiers, cloaks. Nevertheless, it is ...

Journal: :Bulletin of the World Health Organization 1999
M Grasso G Ripabelli M L Sammarco T M Manfredi Selvaggi A Quaranta

Maintaining the vaccine cold chain is an essential part of a successful immunization programme, but in developed countries faulty procedures may occur more commonly than is generally believed. A survey was conducted in a health district in central Italy to assess the methods of vaccine transportation and storage. Of 52 primary vaccination offices inspected, 39 (76.5%) had a refrigerator for vac...

2005
Michel Defrise Laurent Desbat SARAH K. PATCH

ρ-filtered reconstruction in 2D xray CT is comparedand contrasted to 3D thermoacoustic tomography. The math issimpler in 3D than 2D and a simple example sheds light on earlyCT results indicating image quality loss in ρ-filteredreconstruction.

2015
R. Tabrizian F. Ayazi

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