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 46 for “"Wave length"”.
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Wave length measurements in the spectrum of the neodymium arc
Thesis: M.S., Massachusetts Institute of Technology, Department of Physics, 1935
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Waves Generated by Moving Vessels and Cnoidal Wave Interactions with Either a Partially-submerged Porous Barrier or a Mixed Partially-submerged and Submerged Dual Porous-Barrier System
… for estimating moving vessel generated maximum wave heights at Sabine–Neches Waterway in Texas. Using the recorded wave and vessels’ sailing data, the empirical approach with the calibration and validation procedures is carried out to confirm those models’ applicability. The performance of each …
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Compression failure of angle-ply laminates
… response. The wavy layer is described by a wave amplitude and a wave length. Linear elastic stress-strain response is assumed. The geometrically nonlinear theory, in conjunction with the maximum stress failure criterion, was used to predict compression failure loads and failure modes for the …
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Mechanistic modeling of cutting forces in wavy-edge bull-nose helical end-milling of Inconel 718 under different cooling-lubrication strategies
… parameters investigated in this research were: wave magnitude, wave length, axial shift, and the helix angle. The cutting force components and the resultant cutting force predicted by this mechanistic cutting force model under the two cooling strategies were in good agreement with the …
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Vibrations of and sound radiation from some periodic structures under convected loadings
… has been obtained by analysing this field into a wave length frequency spectrum and then numerically integrating the response due to each wave length component. The low wave numbers in the spectrum are important for sound power radiated by the structure especially at subsonic convection velocities …
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Study of Three-Dimensional Vortex Shedding in the Wake of a Square Cylinder
… circular cylinder. Most notably there is a long wave-length three-dimensional disturbance which becomes unstable at a Reynolds number about 170, followed by the appearance of a short wavelength instability. However, this stability analysis also predicts a intermediate wavenumber disturbance which …
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Modulational instability in some shallow water wave models
… is a well known phenomenon of Stokes' periodic waves on the water surface. In this dissertation, we study this phenomenon for periodic traveling wave solutions of various shallow water wave models. We study the spectral stability or instability with respect to long wave length perturbations of …
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Wave Energy Extraction from buoys
Different types of Wave Energy Converters currently tested or under development are using the vertical movement of floating bodies to generate electricity. For commercial applications, arrays have to be considered in order to produce a significant power. In this thesis, we investigate the …
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A Study on the Use of Inverse Opals Composed of Zinc Oxide Aggregate Popcorn Particles to Improve the Efficiency of Dye- Sensitized Solar Cells
… on phonon modes when using the same excitation wave length. To assess the effect of inverse opal structure on DSSC efficiency, further optimization of the EPD technique with regard to popcorn particle inverse opals is anticipated. Future studies will see a more fully extended 3--‐D periodicity …
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Perpendicular Ion Heating by Low-frequency Alfven-wave Turbulence
… proposed models is based on low-frequency Alfven waves (o << O i) launched from the coronal base. Theoretical studies and numerical simulations have shown that Alfven-wave low-beta turbulence primarily cascades to smaller scales perpendicular to the mean magnetic field rather than smaller parallel …
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The design and construction of a photoelectric spectrophotometer for analytical research
… a helium spectrum tube as a light source, the wave length scale was found to be linear;Seven separate amplifiers were constructed, of which one was finally used. It suffered less from random currents and drift than did the other six, but was still so erratic that results could be reproduced …
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Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers
… lasers have been developed to provide continuous-wave (CW) single longitudinal mode (SLM) operation with features including narrow spec- tral linewidth, high output power, good beam quality and wide continuous wave- length tunability for applications such as remote sensing or spectroscopy in the 3 …
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Particle microstructure and polymer dynamics in concentrated polymer solutions
… between 0.45 and 1. The local order and long wave length concentration fluctuations of nanoparticles are obtained from the analysis of scattering structure factors and compared with the Polymer Reference Site Interaction Model (PRISM) theory. Exploiting contrast matching small-angle neutron …
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ATM-Dependent ERK Signaling in Response to DNA Double Strand Breaks
… were treated with Hoechst 33258 followed by long wave-length UV (UV-A) (BrdU photolysis). BrdU photolysis resulted in well-controlled, dose-dependent generation of DSBs equivalent to 0.2 - 20 Gy of IR, as detected by pulse-field gel electrophoresis, accompanied by dose-dependent H2AX …
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Experimental Analysis of the Interaction of Water Waves With Flexible Structures
… investigation of the interaction of water waves with flexible structures acting as breakwaters was carried out. Wave profiles, mapped out by water level measuring transducers, were studied to provide information on the performance of different breakwater models. A new signal analysis …
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Design and construction of a mechanical oscilloscope
… aptly compared to the cross section of an ocean wave. The height of the wave being comparable to the amplitude and the distance from crest to crest being comparable to the wave length. The oscillograph and the oscilloscope are assuming more and more this burden of analysing transient and …
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Microbending effects in singlemode optical fibers: investigation and novel applications
… on the optical fiber that have a spatial wavelength small enough to effect coupling between guided and radiation or cladding modes. The magnitude of this wavelength-dependent coupling is a function of the nature and the number of microdefonnations. Since these periodic perturbations lead …
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Resonance in Magnetically Coupled, Tuned Circuits
… the e.m.f. in the primary is received from the waves in the ether, the ariel and ground being similar to the generator connections as show in the figure. The broadcasting set is almost the opposite of the receiving set. IN receiving and broadcasting, the thing of importance is that the current …
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