• 제목/요약/키워드: Spectroscopy

검색결과 10,081건 처리시간 0.149초

Comparison of Near-Infrared Spectroscopy with Raman Spectroscopy from the Point of Nondestructive Analysis of Biological Materials

  • Takeyuki Tanaka;Hidetoshi Sato;Jung, Young-Mee;Yukihiro Ozaki
    • Near Infrared Analysis
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    • v.1 no.2
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    • pp.9-20
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    • 2000
  • Recently, near-infrared (NIR) spectroscopy and Raman spectroscopy have received keen interest as powerful techniques for nondestructive analysis of biological materials. The purpose of this review paper is to compare the advantages of NIR and Raman spectroscopy in the nondestructive analysis. Both methods are quite unique and often complementary. For example. NIR spectroscopy is very useful in monitoring in situ the content of components inside biological materials while Raman spectroscopy is very suitable for identifying micro-components on the surface of biological materials. In this article specific characters of the two spectroscopic methods are discussed first and then several examples of applications of NIR and Raman spectroscopy to the biological nondestructive analysis are introduced.

해면의 화학적 성분 연구 (The Chemical Constituents from Unidentified Sponge)

  • 박선구
    • 대한화학회지
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    • v.38 no.2
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    • pp.169-173
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    • 1994
  • 인도네시아 Manado만의 Sulawesi에서 채집한 미동정된 해면으로부터 KB cancer cell line에 대해 활성을 갖는 xestoquinone, halenaquinol sulfate 및 halenaquinol이 검출되었다. 이들을 $^1H-,\;^{13}C$-NMR, $^1H-,\;^{13}C$(1 bond) heteronuclear Multiple Quantum Cogerence Spectroscopy$(HMQC)^1$, $^1H-,\;^{13}C$C(2 and 3 bond) Heteronuclear multiple Bond Correlation Spectroscopy$(HMBC)^2$, Electron Impact Mass Spectroscopy(EI ms), UV 및 IR에 의해 밝혔다.

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Consideration of Temperature and Slip Correction for Photothermal Spectrometry

  • Lee, Jeonghoon
    • Asian Journal of Atmospheric Environment
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    • v.9 no.1
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    • pp.86-90
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    • 2015
  • Temperature was considered to estimate the minimum detectable absorption coefficient of aerosol particles from photothermal spectroscopy. Light energy absorbed by subsequent emission from the aerosol results in the heating of the aerosol sample and consequently causes a temperature change as well as changes in thermodynamic parameters of the sample. This thermal effect is the basis of photothermal spectroscopy. Photothermal spectroscopy has several types of techniques depending on how the photothermal effects are detected. Photothermal interferometry traces the photothermal effect, refractive index, using an interferometer. Photoacoustic spectroscopy detects the photothermal effect, sound wave, using a microphone. In this study, it is suggested that the detection limit for photothermal spectroscopy can be influenced by the introduction of a slip correction factor when the light absorption is determined in a high temperature environment. The minimum detectable absorption coefficient depends on the density, the specific heat and the temperature, which are thermodynamic properties. Without considering the slip correction, when the temperature of the environment is 400 K, the minimum detectable absorption coefficient for photothermal interferometry increases approximately 0.3% compared to the case of 300 K. The minimum detectable absorption coefficient for photoacoustic spectroscopy decreases only 0.2% compared to the case of 300 K. Photothermal interferometry differs only 0.5% point from photoacoustic spectroscopy. Thus, it is believed that photothermal interferometry is reliably comparable to photoacoustic spectroscopy under 400 K.

자동차 배출가스 측정을 위한 Photoacoustic Spectroscopy Cell의 3차원 유동장 해석 (Three-Dimensional Fluid Flow Analysis of Photoacoustic Spectroscopy Cell for Measurement of Automotive Exhaust Gas)

  • 김현철;박종호
    • 한국자동차공학회논문집
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    • v.11 no.2
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    • pp.111-118
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    • 2003
  • Recently, environmental damage to urban area becomes serious problem due to the exhaust emissions by increasing the number of vehicle. Especially, exhaust emission from diesel vehicles are blown to be harmful to human health and environment. Photoacoustic Spectroscopy system is very useful technology for simultaneous and continuous measurement of the various components of the automotive exhaust gas. In this study, in order to reduce emission gases from automobile, we tried to develop the measurement system of Photoacoustic Spectroscopy. To improve performance of high sensitive Photoacoustic Spectroscopy system for automotive exhaust emissions, the shape of Photoacoustic Spectroscopy cell was optimized to use the flow analysis. And Exhaust emission data of the 1,500cc gasoline engine was fixed the working fluid. The characteristics of fluid flow for cell were analyzed by various conditions in detail.

해면 Spongia sp.의 화학적 성분 연구 (The Chemical Constituents from the Sponge Spongia sp.)

  • 박선구;오창석
    • 대한화학회지
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    • v.39 no.4
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    • pp.301-305
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    • 1995
  • 인도네시아 Manado만의 Sulawesi에서 채집한 해면 Spongia sp.로부터 KB Cancer cell line에 대하여 활성을 갖는 halenaquinone, epispongiatriol 및 aldisin을 분리하였다. 이들의 구조를 $1^H,\;13^C\;NMR\;1^H\;13^C(1\;bond)$ Heteronuclear Multiple Quantum Coherence Spectroscopy (HMQC), 1H 13C(2 and 3 bond) Heteronuclear Multiple Bond Correlation Spectroscopy (HMBC), Electron Impact Mass Spectroscopy (EI ms) 및 IR로 밝혔다.

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면천체(EXTENDED OBJECTS)에 대한 긴 슬릿 분광관측 연구 (LONG-SLIT SPECTROSCOPY FOR EXTENDED OBJECTS)

  • 성언창
    • 천문학논총
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    • v.15 no.spc1
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    • pp.39-60
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    • 2000
  • We will discuss two-dimmensional spectrophotometry including long-slit spectroscopy and narrow-band imaging. The basic principles, applications, and techniques of observations and data reduction of spectroscopy and spectrophotometry for extended objects are described. This discussion will focus on practical long-slit spectroscopy using a Cassegrain spectrograph attached with 2 or 4m class telescopes and on imaging spectrophotometry using narrow-band interference filter sets. We will discuss scientific applications.

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A Review of Neural Networks in Near Infrared Spectroscopy

  • R.James Berry
    • Near Infrared Analysis
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    • v.2 no.1
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    • pp.25-28
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    • 2001
  • The purpose of this paper is to review the advances in combining near infrared spectroscopy (NIR) with artificial neural networks (NNs). The paper briefly introduces NNs, explains why they are of particular use in NIR research, then reviews their presence in published research.

Coherent Two-Dimensional Optical Spectroscopy

  • Cho, Min-Haeng
    • Bulletin of the Korean Chemical Society
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    • v.27 no.12
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    • pp.1940-1960
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    • 2006
  • Theoretical descriptions of two-dimensional (2D) vibrational and electronic spectroscopy are presented. By using a coupled multi-chromophore model, some examples of 2D spectroscopic studies of peptide solution structure determination and excitation transfer process in electronically coupled multi-chromophore system are discussed. A few remarks on perspectives of this research area are given.

레이저를 이용한 공명이온화 분광학 및 응용 (Laser Resonance ionization Spectroscopy and its application)

  • 송규석;이종민
    • 한국광학회:학술대회논문집
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    • pp.15-22
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    • 1991
  • The general aspects of Laser Resonance Ionization Spectroscopy (RIS) and its application are investigated. Combination of laser selective photoionization and mass spectrometer as apromising spectroscopic as well as an analytical tool is mainly considered. The application of RIS includes mercury (Hg) atomic spectroscopy, trace analysis of lead (Pb) and resonance enhanced two photon ionization spectroscopy of Cis-hexatriene.

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