نتایج جستجو برای: infrared spectrum
تعداد نتایج: 320726 فیلتر نتایج به سال:
In everyday life we encounter electromagnetic radiation in many different forms. Visible light, ultraviolet light, radio waves, and X-rays are all examples of electromagnetic radiation, differing only in wavelength. Infrared radiation occupies that region of the electromagnetic spectrum between visible light and microwaves. The figure below shows the major divisions of the electromagnetic spect...
We report the infrared operation of a two-dimensional photonic crystal waveguide fabricated in silicon. Measurements of the transmission spectrum reveal a large transmission bandwidth within the 3.1-5.5-microm bulk-crystal photonic bandgap and a rich resonance structure. The calculated transmission spectrum for this structure is in good agreement with the measured spectrum and predicts a 10% si...
In contrast to traditional semiconductors, conjugated polymers provide ease of processing, low cost, physical flexibility and large area coverage. These active optoelectronic materials produce and harvest light efficiently in the visible spectrum. The same functions are required in the infrared for telecommunications (1,300-1,600 nm), thermal imaging (1,500 nm and beyond), biological imaging (t...
New mid-infrared (10 and 20 μm) spectro-photometry of the ultraluminous infrared galaxy IRAS 08572+3915 is presented. The 10 μm spectrum reveals a deep silicate absorption feature, while the 20 μm spectrum shows no clear evidence for an 18 μm silicate absorption feature. An interstellar extinction curve is fitted to IRAS 08572+3915 and two other deep silicate infrared galaxies, NGC 4418 and Arp...
We review infrared (1–2.5 µm) observations of cataclysmic variables, a relatively unexplored part of the spectrum in which the dominant sources of emission are the secondary star, the outer regions of the accretion disc and the accretion column in magnetic systems. We describe the advances that have been made in our understanding of cataclysmic variables based on infrared photometry and, more r...
High-resolution infrared spectroscopy in the 2.3-4.6 μm region is reported for the peculiar A supergiant, single-lined spectroscopic binary HR 4049. Lines from the CO fundamental and first overtone, OH fundamental, and several H2O vibration-rotation transitions have been observed in the near-infrared spectrum. The spectrum of HR 4049 appears principally in emission through the 3 and 4.6 μm regi...
The present study evaluates the analytical performance of near infrared as well as attenuated total reflection infrared spectroscopy for the determination of the rosmarinic acid content in Rosmarini folium. Therefore, the recorded near infrared and attenuated total reflection infrared spectra of 42 milled Rosmarini folium samples were correlated with reference data (range: 1.138-2.199 rosmarini...
Some t,ime ago the wriber examined those features of atmospheric radiation whic,li ensue from the fact, that the water va,por spectrum is a line spectrum a.nd not a continuous spectrum (1). At, that time it was not possible to give a qumtitative redetermination of the absprphion, since our spectrosaopic knowledge of the far infrared region was not sufficiently aclvance~d. In the meanbime., the ...
We present a sample of low-resolution 5–38μm Spitzer IRS spectra of the inner few square kiloparsecs of 59 nearby galaxies spanning a large range of star formation properties. A robust method for decomposing mid-infrared galaxy spectra is described, and used to explore the behavior of PAH emission and the prevalence of silicate dust extinction. Evidence for silicate extinction is found in ∼1/8 ...
Although, that the solar energy is important for life continuity, there is need to protect large buildings from these radiations in summer and if the buildings are permitted to take these radiations, the cost of cooling will be too much. One of the most effective methods used to solve this problem is to coat buildings with specific pigments that reflect the solar infrared radiation. This wo...
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