Near‐infrared spectral characteristics of Ge‐doped cultured quartz crystals

1994 ◽  
Vol 75 (9) ◽  
pp. 4741-4743 ◽  
Author(s):  
Harish Bahadur
Keyword(s):  
Near Infrared ◽  
Spectral Characteristics ◽  
Quartz Crystals ◽  
Infrared Spectral

scholarly journals Improving anti-infrared radiation and heat insulation by potassium hexatitanate whisker-doped Al 2 O 3 –SiO 2 composite xerogel

2018 ◽  
Vol 5 (12) ◽  
pp. 180787
Author(s):  
Liang Furong ◽  
Liu Weijun ◽  
Han Xiuxiu ◽  
Zhang Boru ◽  
Zhang Shuhua
Keyword(s):  
Thermal Conductivity ◽  
Infrared Radiation ◽  
Near Infrared ◽  
Raw Materials ◽  
Sol Gel ◽  
Spectral Characteristics ◽  
Molar Ratio ◽  
Thermal Insulating ◽  
Infrared Spectral ◽  
Potassium Hexatitanate

Taking potassium hexatitanate whisker (PTW) modified by silane coupling agent KH550, aluminium nitrate inorganic salt and tetraethyl orthosilicate and deionized water, respectively, as infrared sunscreen, aluminium source and raw materials forming the network structure of a composite xerogel, a series of structurally intact PTW-doped Al 2 O 3 –SiO 2 composite xerogel thermal-insulating materials were prepared by the sol–gel method and dried under atmospheric pressure. The infrared spectral characteristics, infrared radiation transmittance, microstructures, morphology and thermal conductivity of different composite materials prepared have been determined by a Fourier transform infrared spectrometer, UV–visible–near-infrared spectrophotometer, X-ray diffractometer, scanning electron microscope and thermal conductivity tester. The results exhibit that when the Al to Si molar ratio is 1 : 9, the composite material with 5 wt% modified PTW shows the best infrared radiation blocking performance and the lowest thermal conductivity (0.0604 W m −1 K −1 ).

scholarly journals Changes in Spectral Fluorescence Properties of a Near-Infrared Photosensitizer in a Nanoform as a Coating of an Optical Fiber Neuroport

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 556
Author(s):  
Yuliya Maklygina ◽  
Igor Romanishkin ◽  
Aleksej Skobeltsin ◽  
Dina Farrakhova ◽  
Sergej Kharnas ◽  
...  
Keyword(s):  
Immune System ◽  
Spectral Region ◽  
Near Infrared ◽  
Fiber Optic ◽  
Spectral Characteristics ◽  
Infrared Spectral Region ◽  
Advanced Therapies ◽  
Infrared Spectral

In this work, we tested a new approach to assess the presence of inflammatory process in the implant area using spectral methods and the technique of fiber fluorescence analysis of photosensitizers in nanoform. First of all, the spectral characteristics of the photosensitizer when interacting with the porous surface of the implant, based on hydroxyapatite under in vitro and in vivo conditions, were determined. Thus, it was shown that spectral characteristics of photosensitizers can be used for judgement on the process of inflammation in the implant area and thus on the local presence of the immunocompetent cells. The analysis was performed at a sufficient depth in the biotissue by using the near-infrared spectral region, as well as two different methods: fiber-based laser spectroscopy and fiber-optic neuroscopy, which served to monitor the process and regular fluorescence diagnosis of the studied area. Fluorescence spectroscopic analysis was performed on experimental animals in vivo, i.e., under conditions of active immune system intervention, as well as on cell cultures in vitro in order to judge the role of the immune system in the interaction with the implant in comparison. Thus, the aim of the study was to determine the relationship between the fluorescence signal of nanophotosensitizers in the near infrared spectral region and its parameters with the level of inflammation and the type of surface with which the photosensitizer interacts in the implant area. Thus, fiber-optic control opens up new approaches for further diagnosis and therapy in the implant area, making immune cells a prime target for advanced therapies.

A Preliminary Study on the near Infrared Spectral Characteristics of Purchased Flue-Cured Tobacco

2011 ◽  
Vol 396-398 ◽  
pp. 2027-2032
Author(s):  
Ying Zhang ◽  
Li Yuan He
Keyword(s):  
Spectral Data ◽  
Near Infrared ◽  
Wave Length ◽  
Spectral Characteristics ◽  
Spectral Difference ◽  
Tobacco Leaf ◽  
Positive Group ◽  
Grade Classification ◽  
Infrared Spectral ◽  
Insignificant Difference

In order to explore the application of near-infrared spectrum technology in the grading of purchased flue-cured tobacco, positive group of flue-cured tobacco with different grades was gathered; the near-infrared spectral data across different grades, in the same grade, and different test zones of the same tobacco leaf were determined and acquired to analyze their near-infrared spectral characteristics and their representativeness. The findings indicated that the positive group of flue-cured tobacco was highly homogeneous; there was identical near-infrared spectral characteristics in any zone of the same tobacco leaf; the peaks and troughs of wave length of the near-infrared spectral characteristics of different samples with identical grade were also consistent, with extremely insignificant difference in reflectivity; the near-infrared spectral difference between the tobacco leaves with different grades was much more significant than that in different test zones of the same tobacco leaf. It was highly probable to take the reflectance ratio of the peaks and troughs of wave length as the standard for grade classification. It is feasible to appraise the quality of purchased flue-cured tobacco using near-infrared spectral data.

scholarly journals Quantitative Deterioration Evaluation of Heavy-Duty Anticorrosion Coating by Near-Infrared Spectral Characteristics

2021 ◽  
Vol 8 (1) ◽  
pp. 26
Author(s):  
Shunsuke Kishigami ◽  
Yuki Matsumoto ◽  
Yuki Ogawa ◽  
Yoshiaki Mizokami ◽  
Daiki Shiozawa ◽  
...  
Keyword(s):  
Near Infrared ◽  
Quantitative Estimation ◽  
Spectral Characteristics ◽  
Experimental Studies ◽  
Steel Bridges ◽  
Heavy Duty ◽  
Anticorrosion Coating ◽  
Anticorrosion Coatings ◽  
Infrared Spectral ◽  
Infrared Intensity

Heavy-duty anticorrosion coatings are applied on the surface of steel bridges for protecting against corrosion. By aging deterioration, the coating is worn from the surface year by year. Appropriate re-painting construction programs should be adopted for the maintenance of the bridges according to the evaluation of wear extent. Experimental studies were conducted with the aim of quantitative estimation of the degree of abrasion of the top coat thickness. It was found that there was a correlation between the top coat thickness and the observed infrared intensity and that this calibration relationship could be used to estimate the top coat thickness.

Orbital Identification of Carbonate-Bearing Rocks on Mars

Science ◽  
2008 ◽  
Vol 322 (5909) ◽  
pp. 1828-1832 ◽  
Author(s):  
Bethany L. Ehlmann ◽  
John F. Mustard ◽  
Scott L. Murchie ◽  
Francois Poulet ◽  
Janice L. Bishop ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Characteristics ◽  
Magnesium Carbonate ◽  
Rock Layer ◽  
Aqueous Alteration ◽  
Near Surface ◽  
Carbonate Formation ◽  
Aqueous Environments ◽  
Infrared Spectral ◽  
Geochemical Models

Geochemical models for Mars predict carbonate formation during aqueous alteration. Carbonate-bearing rocks had not previously been detected on Mars' surface, but Mars Reconnaissance Orbiter mapping reveals a regional rock layer with near-infrared spectral characteristics that are consistent with the presence of magnesium carbonate in the Nili Fossae region. The carbonate is closely associated with both phyllosilicate-bearing and olivine-rich rock units and probably formed during the Noachian or early Hesperian era from the alteration of olivine by either hydrothermal fluids or near-surface water. The presence of carbonate as well as accompanying clays suggests that waters were neutral to alkaline at the time of its formation and that acidic weathering, proposed to be characteristic of Hesperian Mars, did not destroy these carbonates and thus did not dominate all aqueous environments.

Metastructures for the Giant Enhancement of Raman Scattering in the Near Infrared Spectral Range

JETP Letters ◽  
2020 ◽  
Vol 112 (1) ◽  
pp. 31-36
Author(s):  
V. I. Kukushkin ◽  
V. E. Kirpichev ◽  
E. N. Morozova ◽  
V. V. Solov’ev ◽  
Ya. V. Fedotova ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spectral Range ◽  
Near Infrared ◽  
Infrared Spectral Range ◽  
Infrared Spectral
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