Far-infrared pedestrian sequence segmentation based on time domain semantics

2020 ◽  
Author(s):  
Shaowu Peng ◽  
Zhenju Wang ◽  
Qiong Liu ◽  
Junying Chen
Keyword(s):  
Time Domain ◽  
Far Infrared ◽  
Sequence Segmentation ◽  
Domain Semantics

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

scholarly journals Far-infrared time-domain spectroscopy with terahertz beams of dielectrics and semiconductors

1990 ◽  
Vol 7 (10) ◽  
pp. 2006 ◽  
Author(s):  
D. Grischkowsky ◽  
Søren Keiding ◽  
Martin van Exter ◽  
Ch. Fattinger
Keyword(s):  
Time Domain ◽  
Far Infrared ◽  
Time Domain Spectroscopy

Terahertz Radiation Spectroscopy on Chloroform Confined in Porous Silica Glasses

2003 ◽  
Vol 790 ◽  
Author(s):  
Kohji Yamamoto ◽  
Taku Satoh ◽  
Hiroaki Okuno ◽  
Kiesuke Tominaga ◽  
Shinji Saito ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Intermolecular Interactions ◽  
Infrared Absorption ◽  
Terahertz Radiation ◽  
Time Domain ◽  
Porous Silica ◽  
Far Infrared ◽  
Silica Glasses ◽  
Infrared Absorption Spectra ◽  
Confined System

ABSTRACTTerahertz (THz) time-domain spectroscopy (TDS) has been used to study far infrared absorption spectra of chloroform confined within nanoporous glasses of various pore sizes. Intermolecular interactions and dynamics in the confined system are discussed.

Creation of Titania Artificial Interfaces with Geometric Patterns by Using Micro Stereolithography and Aqueous Solution Techniques

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000117-000122
Author(s):  
Soshu Kirihara ◽  
Yousuke Itakura ◽  
Satoko Tasaki
Keyword(s):  
Time Domain ◽  
Anatase Phase ◽  
Far Infrared ◽  
Terahertz Wave ◽  
Terahertz Waves ◽  
Glass Substrates ◽  
Geometric Patterns ◽  
Water Solvent ◽  
Micro Patterning ◽  
Geometric Arrangements

Titania micro patterns with periodic arrangements were formed on glass substrates successfully for electromagnetic wave energy resonations and localizations in terahertz frequency ranges. Geometric arrangements of acryl polygon tablets with titania particles dispersions by using micro patterning stereolithography. Moreover, periodically arranged full titania tablets with anatase phase were created homogeneously though liquid phase crystal depositions of water solvent processes under micro templates fabricated by using the stereolithography system. The terahertz wave properties were measured and simulated by a using time domain spectroscopic system and finite difference time domain method. The terahertz waves having micrometer order wavelengths and belonging in far-infrared frequency ranges are expected to apply for various types of novel sensors which can detect micro cracks on materials surfaces, micro defects in electric devices, bacteria in foods, and cancer cells in human skins.

scholarly journals Far-infrared vibrational spectra of all-trans, 9-cis and 13-cis retinal measured by THz time-domain spectroscopy

2000 ◽  
Vol 332 (3-4) ◽  
pp. 389-395 ◽  
Author(s):  
M. Walther ◽  
B. Fischer ◽  
M. Schall ◽  
H. Helm ◽  
P.Uhd Jepsen
Keyword(s):  
Vibrational Spectra ◽  
Time Domain ◽  
Far Infrared ◽  
Time Domain Spectroscopy
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