Methods and approaches of high resolution spectroscopy for analytical applications

Вакс, В. Л.; Домрачева, Е. Г.; Chernyaeva, M. B.; Приползин, С. И.; Revin, L. S.; Tretjyakov, I. V.; Anfertev, Vladimir; Yablokov, Anton

doi:10.1007/s11082-017-1076-6

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…The approach based on a fast frequency sweep through the absorption line was used in the spectrometer with a radiation source on a backward wave oscillator operating in the range from 118 to 178 GHz [14]. Fast sweeping allows for the recording of all the absorption lines throughout the spectrometer's frequency range and detecting several substances simultaneously.…”

Section: Methodsmentioning

confidence: 99%

Novel Approaches in the Diagnostics of Ear-Nose-Throat Diseases Using High-Resolution THz Spectroscopy

et al. 2023

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Nowadays, physicochemical methods of analysis are used in medical diagnostics. One can identify metabolites characteristic of a particular disease. The compilation of a metabolic profile will facilitate the diagnosis of diseases, evaluate their stage and etiology, and predict treatment. The goal of the study is to analyze the metabolite composition of the ear-nose-throat (ENT) tissues by high-resolution THz spectroscopy based on nonstationary effects and compare metabolites formed during the thermal decomposition of relatively healthy mucosa, polyps, and cysts. Studies were performed with the spectrometers operating from 118 to 178 GHz. The chemical compounds were identified using online catalogs. In all samples, there are such substances as methanol, propanediol, acetaldehyde, acetonitrile, butyronitrile, methyl mercaptan, azole, ethylene sulfide, carbon sulfide, and sulfur dioxide. In the spectrum of relatively healthy mucosa, the number of absorption lines of these substances is much less than in the spectrum of the polyps and cysts, which indicates their lower concentration. In the products of the polyps and cysts, acetone, hydroxyacetone, dihydroxyacetone, propionitrile, acrylonitrile, aminopropionitrile, hydroxyacetonitrile, aminoacetonitrile, methylbutironitrile, propanal, glycolaldehyde, lactaldehyde, and malone dialdehyde appear. The products of cysts’ thermal decomposition also contain acetic and acrylic acids. High-resolution THz spectroscopy has been shown to be promising for detecting disease metabolites in ENT tissues.

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Section: Methodsmentioning

confidence: 99%

Novel Approaches in the Diagnostics of Ear-Nose-Throat Diseases Using High-Resolution THz Spectroscopy

et al. 2023

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“…used hyperspectral image data representation based on the ‘bag of spectra words’ model as the input to a chi‐square kernel support‐vector‐machine classifier for recognizing rice blast and predicting the disease level . On the one hand, spectroscopy can provide image information in different spectral bands of the target to be measured and does not require high spatial resolution of the image . On the other hand, spectroscopy methods need to build complex models, but models are not universal.…”

Section: Introductionmentioning

confidence: 99%

“…8 On the one hand, spectroscopy can provide image information in different spectral bands of the target to be measured and does not require high spatial resolution of the image. 9 On the other hand, spectroscopy methods need to build complex models, but models are not universal. Spectral technology has high requirements for instruments and equipment, and it is prone to giving false-positive results.…”

Section: Introductionmentioning

confidence: 99%

A rapid rice blast detection and identification method based on crop disease spores' diffraction fingerprint texture

Yang

Wang

et al. 2020

J Sci Food Agric

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BACKGROUND Rice blast fungus is a worldwide disease, and it is one of the most serious rice diseases in the north and south rice fields in China. The initial symptoms of rice blast are not obvious, and the speed of transmission is fast. Manual identification is time‐consuming and laborious. At present, it is a great challenge to realize rapid and accurate early identification of rice blast. RESULTS In this paper, an identification method based on crop disease spores' diffraction fingerprint texture for rice blast was studied; this method utilizes the light field and texture features of diffraction images. To verify the reliability of the model that we proposed, we selected two methods of manual identification and machine recognition to compare and detect rice blast spores. The experimental results show that the identification of light diffraction characteristics is not only higher than the traditional manual recognition by microscope (increased by more than 0.3%), but also faster after neural network training (increased by more than 90%). The diffraction recognition method used in this study, based on crop disease spores' diffraction fingerprint texture, can be completed in a few seconds, and its test accuracy is 97.18%. CONCLUSION The proposed method, a rapid rice blast detection and identification method based on crop disease spores' diffraction fingerprint texture, has certain advantages compared with the existing manual identification by microscope. This method can be applied to the recognition of rice blast in agricultural research. © 2020 Society of Chemical Industry

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“…With the Terahertz gap for radiation sources gradually filling up with new practical and compact devices, there is yet one more Terahertz gap to fill: the one for chaotic radiation sources. The need for them arises in cryptography which uses chaos to encrypt information [25][26][27], high-resolution THz spectroscopy [28][29][30][31] and computer engineering which demands high-rate true random number generators [32]. Although alternative technologies for generation of true random numbers exist, which rely on quantum effects [33][34][35] and various entropy sources [36][37][38], the chaos-based systems enable to achieve higher generation rates [39][40][41][42].…”

mentioning

confidence: 99%

Bridging the terahertz gap for chaotic sources with superconducting junctions

2019

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We observe a broadband chaotic signal of Terahertz frequency emitted from a superconducting junction. The generated radiation has a wide spectrum reaching 0.7 THz and power sufficient to drive on-chip circuit elements. To our knowledge, this is the first experimental observation of a highfrequency chaotic signal emitted by a superconducting system which lies inside the Terahertz gap. Our experimental finding is fully confirmed by the numerical modeling based on the microscopic theory and reveals the unrealized potential of superconducting systems in chaos-based Terahertz communication, fast generation of true random numbers and non-invasive Terahertz spectroscopy applicable to physical, chemical and biological systems. arXiv:1709.04052v3 [cond-mat.supr-con]

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Methods and approaches of high resolution spectroscopy for analytical applications

Cited by 11 publications

References 28 publications

Novel Approaches in the Diagnostics of Ear-Nose-Throat Diseases Using High-Resolution THz Spectroscopy

Novel Approaches in the Diagnostics of Ear-Nose-Throat Diseases Using High-Resolution THz Spectroscopy

A rapid rice blast detection and identification method based on crop disease spores' diffraction fingerprint texture

Bridging the terahertz gap for chaotic sources with superconducting junctions

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