نتایج جستجو برای: ir spectrum

تعداد نتایج: 289232  

Journal: :Physics & astronomy international journal 2022

This study aims to extend the light spectrum which could be absorbed by TiO2 infrared ray (IR) loading P4O10 in order promote CO2 reduction performance of photocatalyst. Three ranges with P4O10/TiO2 film are studied, ultra violet (UV) + visible (VIS) IR, VIS and IR only. also investigates impact molar ratio CO2/H2O or CO2/NH3 on characteristics film. The largest case is obtained at CO2:H2O = 1:...

Journal: :Optics express 2013
Weiqiang Yang Bin Zhang Ke Yin Xuanfeng Zhou Jing Hou

High power all fiber mid-IR supercontinuum (SC) generation in a ZBLAN fiber pumped by a 2 μm master oscillator power amplifier (MOPA) system is demonstrated. A semiconductor saturable absorber mirror (SESAM) passively mode-locked laser with pulse width of 26 ps at 1960 nm is used as the seed of the MOPA system. A laser spectrum extending from ~1.9 μm to beyond 2.6 μm is generated in a subsequen...

1998
G. Lagache A. Abergel F. Boulanger F. X. Désert

We present a new analysis of the far-IR emission at high Galactic latitude based on COBE and HI data. A decomposition of the Far-IR emission over the HI, H+ and H2 Galactic gas components and the Cosmic Far InfraRed Background (CFIRB) is described. For the first time the far-IR emission of dust associated with the Warm Ionised Medium (WIM) is evidenced. This component determined on about 25% of...

Journal: :Journal of chromatography. A 2006
Krisztina István Róbert Rajkó Gábor Keresztury

The high-performance liquid chromatography-infrared spectroscopy (HPLC-IR) technique utilizing on-line flow through cell (FTC) detection has an inherent practical problem: strong absorption bands of the eluent may mask valuable analytical regions of the IR spectrum. The experimentalists' answer to this challenge is physical elimination of the chromatographic eluent before spectroscopic detectio...

Journal: :Optics express 2015
Christos Argyropoulos

We present a hybrid graphene/dielectric metasurface design to achieve strong tunable and modulated transmission at near-infrared (near-IR) frequencies. The proposed device is constituted by periodic pairs of asymmetric silicon nanobars placed over a silica substrate. An one-atom-thick graphene sheet is positioned over the all-dielectric metasurface. The in-plane electromagnetic fields are highl...

2016
Dmitry Moor Sven Seuken Tobias Grubenmann Abraham Bernstein

In some auction domains, there is uncertainty regarding the final availability of the goods being auctioned off. For example, a government may auction off spectrum from its public safety network, but it may need this spectrum back in times of emergency. In such a domain, standard combinatorial auctions perform poorly because they lead to violations of individual rationality (IR), even in expect...

2008
F. Neubrech D. Weber T. Cornelius M. Lopes

Using infrared (IR) spectroscopic microscopy we studied resonant light scattering from gold nanorods prepared by electron beam lithography (EBL) as well as from cylindrical gold nanowires prepared by the template method. Rectangular nanorods with diameter in the 100 nm range act as resonant antennae showing significant antenna-like plasmon resonances similar to those of cylindrical nanowires wi...

2015
Hari Sreedhar Vishal K. Varma Peter L. Nguyen Bennett Davidson Sanjeev Akkina Grace Guzman Suman Setty Andre Kajdacsy-Balla Michael J. Walsh

High-definition Fourier Transform Infrared (FT-IR) spectroscopic imaging is an emerging approach to obtain detailed images that have associated biochemical information. FT-IR imaging of tissue is based on the principle that different regions of the mid-infrared are absorbed by different chemical bonds (e.g., C=O, C-H, N-H) within cells or tissue that can then be related to the presence and comp...

2010
Alberto Costa Massimo Melucci

Information Retrieval (IR) systems combine a variety of techniques stemming from logical, vector-space and probabilistic models. This variety of combinations has produced a significant increase in retrieval effectiveness since early 1990s. Nevertheless, the quest for new frameworks has not been less intense than the research in the optimization and experimentation of the most common retrieval m...

2008
ASANTHA COORAY ANDREW LANGE EDWARD L. WRIGHT

We describe the angular power spectrum of unresolved 3.6 μm IR light in Spitzer GOODS fields. The amplitude of the anisotropy spectrum decreases with decreasing flux threshold to which resolved sources are removed from images. When all pixels brighter than a Vega magnitude of 24.6 are removed, the amplitude of the power spectrum at arcminute angular scales can be described with an extra compone...

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