Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 906 for “"infrared spectroscopy"”.
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Infrared spectroscopy of interstellar grains
… subtle differences in regional chemistry. Infrared spectroscopy of interstellar grains has enabled many grain components to be identified and their importance in the ISM to be understood. An analysis of cold molecular cloud mantles has been presented in this thesis, and should provide a …
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Infrared spectroscopy of photodissociated carboxymyoglobin
Infrared spectra of carbon monoxide bound myoglobin reveal several lines due only to the carbon monoxide. Studies with isotopically enriched CO confirm the assignment of these lines. After photodissociation, the lines shift and change in extinction coefficient, giving an indication of the nature of …
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Studies in far infrared spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1958.
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Infrared spectroscopy of ion-hydrocarbon clusters
… To accomplish this, a combination of gas phase infrared predissociation spectroscopy (IRPD) and tandem mass spectrometry is utilized. The solvation of alkali metal ions by methane is discussed first, beginning with the effects of multiple argon atoms on Li+•••CH4 dimer clusters followed by a …
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INFRARED SPECTROSCOPY AND KINETICS OF TRANSIENT SPECIES
High resolution infrared spectroscopy of transient species produced in a discharge in Ar over polyacetylene and deuterated polyacetylene has been studied using an improved magnetic rotation technique and color center laser probing. Five bands ((0-1), (1-2), (2-3), (3-4), and (4-5)) of the C$\sb2$ …
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Near-Infrared Spectroscopy for Brain Computer Interfacing
… approach to BCI design, using noninvasive near-infrared spectroscopic (NIRS) techniques to develop a userfriendly optical BCI. NIRS is a practical non-invasive optical technique that can detect characteristic haemodynamic responses relating to neural activity. This thesis describes the use of …
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Characterization of Electrochemical Interfaces by INfrared Spectroscopy
… interfaces are studied using Fourier transform infrared spectroscopy. Potential difference infrared spectroscopy (PDIRS) was used in the investigation of carbon monoxide adsorbed on polycrystalline platinum electrodes. It is found that the infrared peak position of adsorbed carbon monoxide is …
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Infrared spectroscopy of volcanic gases at Masaya, Nicaragua
… sensing technique of open-path Fourier transform infrared spectroscopy. This technique meets criteria for safe and accurate quantitative characterisation of volcanic gases and on a temporal resolution previously impracticable. Flexibility of operation is the chief merit of OP-FTIR, since a range …
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Machine Learning Methods for functional Near Infrared Spectroscopy
… machine interaction. Functional Near Infra-Red Spectroscopy (fNIRS) device is a relatively new device that enables inference of brain activity through non-invasively pulsing infra-red light into the brain. The fNIRS device is particularly useful as it has a better spatial resolution than the …
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Ultrafast infrared spectroscopy investigation of DNA-ligand interactions
Two-dimensional infrared spectroscopy (2D-IR) is a label-free analysis method that can provide structural insight into biological processes by uncovering the coupling between the intrinsic, vibrational modes of a molecule. Technological advancements in the last decade have drastically reduced …
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Infrared Spectroscopy of Cytochrome C Oxidase Intermediate States
… hydrogen bond lengths, and protonation states. Infrared spectroscopy is capable of monitoring these changes. In this thesis work, cytochrome c oxidase was specially prepared for perfusion-induced infrared difference spectroscopy. The resulting infrared difference spectra demonstrate that the …
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A Neurofeedback-based Near-infrared Spectroscopy Brain-computer Interface
Near-infrared spectroscopy (NIRS) brain-computer interfaces (BCIs) enable individuals to interact with their environment using only cognitive activities. This thesis investigates the development of a more user-friendly, intuitive, and easy to use NIRS-BCI through six research objectives: exploring …
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NEAR INFRARED SPECTROSCOPY IN ANIMAL NUTRITION AND FEED EVALUATION
La presente tesi di dottorato è incentrata sull’importanza dell’utilizzo della spettroscopia del vicino infrarosso (NIRS) come un mezzo rapido e a basso costo per la previsione e il monitoraggio della composizione dei nutrienti e della qualità di diversi tipi di alimenti per animali, essiccati e …
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Developing Time-Resolved Synchrotron Infrared Spectroscopy for Spectroelectrochemical Measurements
… platforms utilizing synchrotron infrared radiation (SIR) and time-resolved FTIR to study the kinetics of electrochemical reactions on second to millisecond scale with high chemical sensitivity. It will cover development of spectroelectrochemical cells and procedures compatible …
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Frequency-Domain Near-Infrared Spectroscopy in the Human Brain
Monitoring brain tissue oxygen supply, demand, delivery and consumption can be achieved by quantifying the absolute values of oxy- and deoxy-hemoglobin and how these quantities change over time during rest, functional activation, pathology, and disease. My dissertation describes the development, …
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Characterization of spray dried powders by near infrared spectroscopy
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Comet-asteroid differentiation using visible and near-infrared spectroscopy
… cometary candidates were observed in visible and infrared wavelengths in an attempt to correctly classify them as asteroids or dormant or extinct comets. From this data, two groups of objects were identified: one group of possible cometary candidates, and one group of likely outer asteroid belt …
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Miniature gas sensing device based on near-infrared spectroscopy
… to make miniature gas sensor based on near-infrared spectroscopy for acetylene gas detection. In this work, the basic principles of infrared spectroscopy are reviewed. Also, the principle of operation, fabrication, testing, and analysis of the proposed sensor are discussed in details.
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Characterisation of minerals using evolved gas analysis and infrared spectroscopy.
Several methods have been used for the characterisation of minerals in powders and in rocks. Particular emphasis has been directed towards the use of chemical probes to elucidate the surface mineralogy in order to provide detection profiles suitable for both qualitative and quantitative chemometric …
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