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Showing 1 to 20 of 20 for “"Vibrational Analysis"”.
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Failure detection in transformers using vibrational analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.
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Free Vibrational Analysis of Structural Systems Using the Method of Substructuring
Made available in DSpace on 2014-12-12T00:25:57Z (GMT). No. of bitstreams: 1 7511858.pdf: 1996437 bytes, checksum: f43fc26384a55a8ef69bca2b5780a102 (MD5) Previous issue date: 1974
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Internal and External Vibrations of Weakly Bound Molecular Complexes: Infrared Spectroscopy and Vibrational Analysis
Infrared vibrational predissociation spectroscopy has been used to study the internal (intramolecular) and external (intermolecular) vibrations of weakly bound molecular complexes in a molecular beam apparatus. The apparatus features a continuous supersonic expansion source and mass selective …
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ΦΑΣΜΑΤΟΣΚΟΠΙΚΗ ΜΕΛΕΤΗ ΑΕΡΙΩΝ ΣΥΜΠΛΟΚΩΝ ΣΕ ΥΨΗΛΕΣ ΘΕΡΜΟΚΡΑΣΙΕΣ ΣΕ ΣΥΣΤΗΜΑΤΑ ΧΛΩΡΙΟΥΧΩΝ ΑΛΑΤΩΝ ΤΩΝ ΣΙΔΗΡΟΥ, ΧΡΥΣΟΥ ΚΑΙ ΑΛΟΥΜΙΝΙΟΥ
… (III) CHLORIDE-ALUMINUM CHLORIDE SYSTEM, THE VIBRATIONAL FREQUENCIES OF THE FE2CL6(9), FECL3(9) AND FEA MOLECULES WERE MEASURED FROM THE RAMAN SPECTRA. VIBRATIONAL ANALYSIS WAS PERFORMED FOR THE ABOVE MOLECULES BY MEANS OF "NORMAL COORDINATE ANALYSIS". THETHERMODYNAMIC FUNCTIONS OF ALL THE …
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Fundamental computational investigations of halogen and chalcogen bonding : electronic structure and reactivity.
… theory. This includes geometry optimizations, vibrational analysis, analysis of electrostatic potential surfaces, Natural Bond Orbital (NBO) analysis, and quantum theory of atoms in molecules analysis. The main projects here include local-mode vibrational analysis of multifaceted …
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Quantum chemistry for spectroscopy : a tale of three spins (S = 0, 1/2, and 1)
… computational techniques. First, large-amplitude vibrational motions on ground-state singlet (S0) potential energy surfaces are analyzed for both the acetylene/vinylidene and the HCN/HNC isomerization systems. Electronic properties such as electric dipole moments and nuclear quadrupole coupling …
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Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires
… This study also talks about the structural and vibrational finite element analysis of a tire testing machine. Since the machine was designed to conduct different tire tests, different structural requirements of the tire positioning mechanism pertaining to each test were taken into consideration, …
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Design and fabrication of a high precision wafer polishing machine
… was designed for maximum rigidity using FEA analysis. Vibrational analysis was also performed to design a mechanically quiet system. All of the associated components were designed with extreme precision in mind. In addition to the upper structure, a loading mechanism was also designed for the …
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Chemical and biochemical applications of vibrational spectroscopy
Vibrational spectroscopy is a technique that probes a molecule’s vibrational modes via infrared absorption and Raman scattering, and is often used as a tool for characterization and/or functional group determination. Because infrared (IR) and Raman spectra are directly influenced by the bonds …
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Nonlinear vibration and chaotic motion of uniform and non-uniform carbon nanotube resonators.
Vibration analysis of carbon nanotubes (CNTs) is very essential field owing to their many promising applications in tiny instruments. The unique and interesting properties of CNTs, particularly their mechanical and electrical features, have fascinated industries and researchers to implement CNTs …
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Organoisocyanates: the conformational stability determination by infrared, raman and microwave spectroscopy and ab initio calculation
… dissolved in rare gas solution. The complete vibrational assignments have been proposed for all the energetically stable conformations. Microwave spectra for several of the ring molecules have been investigated from 10,000 to 21,000 MHz with transitions for the most stable conformer assigned. …
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Multidisciplinary Optimization of Next-Generation Aero-Engine Fans
… An additional weakly-coupled aero-structural analysis is also performed on the optimal vortex generator to assess its material integrity. A simplified vibrational analysis conducted on a representative downstream component demonstrates important reductions in the forced response, which is one …
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The ground and excited state molecular structure of model systems undergoing photochemical processes and the characterization of active agents by means of vibrational spectroscopy and theoretical calculations
The present thesis reports about vibrational and quantum chemical investigations on model systems undergoing photochemical processes and pharmaceutically active compounds, respectively. Infrared (IR) and Raman spectroscopy were applied for the characterization of the ground state molecular …
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Anharmonic vibrational many-body theory for molecules and extended systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Development of an Accurate and Efficient Method for Normal Mode Analysis in Extended Molecular Systems: the Mobile Block Hessian Method
Vibrational spectroscopy is an important technique for the structural characterization of (bio)molecules and (nano)materials. For example, it is particularly suited for studying proteins in their natural environment (i.e., in aqueous solution), and can be used in many cases where other techniques …
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To Couple or not to Couple? Exploring Vibronic Coupling in Organic Semiconductors
… interaction between electronic excitations and vibrational degrees of freedom not only shapes energy conversion pathways but often dictates device efficiency limits. Controlling—or at the very least, understanding—this coupling is therefore essential. This thesis investigates the molecular and …
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Flexible Media Polishing Machine for Ti-6Al-4V Components
… process, as well as by using experimental analysis to verify the process viability and compatibility with Ti-6Al-4V (and subsequently, other easier to machine materials). A thorough literature review is presented with the most important conclusions of optimal polishing conditions (high …
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Vibrational dynamics of aqueous hydroxide solutions studied using ultrafast infrared spectroscopy
… to the strength of hydrogen bonding and hence vibrational frequencies, intensities and line shapes are closely associated with the structure and dynamics of the hydroxide ions. In this thesis, we have employed ultrafast infrared spectroscopy in conjunction with theoretical modeling to …
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The Electronic and Vibrational Spectroscopy of Metal Phthalocyanines and Metal Phthalocyanine Chlorides Isolated in Low Temperature Solids
… amplified emission of matrix-isolated GaPcCl. A vibrational analysis is performed on the ground electronic state of the molecule (as well as the related molecules MgPc and AlPcCl), which is used to assign the vibronic bands observed in emission and excitation. The infrared absorption spectra of …