نتایج جستجو برای: frequency content absorption

تعداد نتایج: 1002461  

Journal: :The British journal of nutrition 2005
Inge Tetens Tanja M Larsen Mette Bach Kristensen Ole Hels Mikael Jensen Cathrine M Morberg Agnete D Thomsen Liselotte Højgaard Marianne Henriksen

Fe absorption is affected by many dietary factors. The objective of the present study was to measure the effects of high v. low content of vitamin C, meat and phytic acid in whole diets with Fe-fortified bread on the efficacy of Fe absorption. Thirty-two healthy women with low Fe stores were randomised to three groups, each of which was given two of six test diets containing either low/high amo...

Journal: :Applied spectroscopy 2006
Vincent P Wallace Anthony J Fitzgerald Emma Pickwell Richard J Pye Philip F Taday Niamh Flanagan Thomas Ha

Good contrast is seen between normal tissue and regions of tumor in terahertz pulsed imaging of basal cell carcinoma (BCC). To date, the source of contrast at terahertz frequencies is not well understood. In this paper we present results of a spectroscopy study comparing the terahertz properties (absorption coefficient and refractive index) of excised normal human skin and BCC. Both the absorpt...

2016
Xiaosi Qi Qi Hu Hongbo Cai Ren Xie Zhongchen Bai Yang Jiang Shuijie Qin Wei Zhong Youwei Du

In order to explore high efficiency microwave absorption materials, heteronanostructured Co@carbon nanotubes-graphene (Co@CNTs-G) ternary hybrids were designed and produced through catalytic decomposition of acetylene at the designed temperature (400, 450, 500 and 550 °C) over Co3O4/reduced graphene oxide (Co3O4/RGO). By regulating the reaction temperatures, different CNT contents of Co@CNTs-G ...

2007
D. M. Hemeda M. Z. Said

A spinel ferrite of the system NiSixFe2-xO4 with (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) were studied via IR, Xray spectra and cation distribution. The X-ray pattern confirmed the spinel cubic structure of all Si contents. The lattice parameters estimated as a function of Si contents indicated a slight decrease of lattice parameter up to 0.2. The grain size increases with increasing Si content up t...

2002
J. Wang M. Sheik-Bahae A. A. Said D. J. Hagan E. W. Van Stryland

We introduce a temporal delay in one beam of the two-color Z-scan apparatus, which measures nondegenerate nonlinear absorption and nondegenerate nonlinear refraction. This technique allows us to time resolve separately the sign and the magnitude of the nonlinear absorption and refraction at frequency p that are due to the presence of a strong excitation at frequency oe. For example, in semicond...

2012
Jonathan Bischof Edoardo M. Airoldi

Recent work in text analysis commonly describes topics in terms of their most frequent words, but the exclusivity of words to topics is equally important for communicating content. We introduce Hierarchical Poisson Convolution (HPC), a model which infers regularized estimates of the differential use of words across topics as well as their frequency within topics. HPC uses known hierarchical str...

Journal: :The Journal of the Acoustical Society of America 1960

Journal: :IEEE Access 2022

This study developed a novel method for analyzing and decomposing signal into its main dynamics small large timescales. Our proposal is based on decoupled hybrid system of convolutional recurrent neural networks that uses as inputs the power spectrum spectrogram given signal, giving output dynamic behavior. We define classification predicted using previously known characterized through training...

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