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.
Results
Showing 1 to 20 of 50 for “"third harmonic"”.
-
Third harmonic generation microscopy and applications
Includes bibliographical references (pages 40-41).
-
Third Harmonic Generation as a Probe of Ultrafast Phase Transitions
Also presented are initial efforts to measure the solidification rate of metal samples using linear methods, including the design and operation of a deferential photo detector as well as the first quantitative measurements of the thermal conductance of metal-metal interfaces. The room temperature …
-
A higher-order panel method for third-harmonic diffraction problems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, February 1997.
-
Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… combining Golay coding with fundamental and third harmonic 1, 3 chirps with resolution enhancement compression (REC) and frequency compounding, increases the axial resolution, lateral resolution, penetration depth and the contrast-to-noise ratio (CNR) for an ultrasonic imaging system. The …
-
Third Harmonic Generation: A Method for Visualizing Myelin in the Murine Cerebral Cortex
<p>Here we present the use of Third Harmonic Generation (THG) for the label-free imaging of myelinated axons in the murine cerebral cortex. Myelin plays an important role in the processes of learning and disease. However, much of the myelin biology research thus far has focused on white matter …
-
Design of a hermetically sealed MEMS resonator with electrostatic actuation and capacitive third harmonic sensing
A microscale beam resonator has been designed and fabricated for use as a modular pressure sensor for vacuum applications. The device dimensions have been optimized to provide measurable signals with low noise. Electrostatic actuation and sensing are both performed using only one pair of …
-
Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples
… The simulation results of FOC of PMSM with third-harmonic injection PWM and traditional FOC are compared. This comparison proves that FOC of PMSM with third-harmonic injection provides a better dynamic response for a quadrotor’s movement in vertical direction. In addition, since PWM is …
-
A 2-D Scalable Third harmonic radiator at 291.3 GHz with -2 dBm of Radiated Power in 22 nm FinFET Technology
The Terahertz (THz) band exhibits potential for novel applications and improvements to existing systems such as spectroscopy, imaging, and high-speed communications. However, the lack of high-power sources at this frequency range hinders the wide-scale adoption of these technologies commercially. …
-
Harmonic control of multiple-stator induction machines for voltage regulation
… current path. By controlling the phase of the third harmonic on the machine drive stator circuits, and thus the waveforms present on the secondary and tertiary stator winding circuits, the output voltage of the rectifier with a zero-sequence current path can be tune above or below the rectifier …
-
Polar Field Oriented Control with 3rd Harmonic Injection
… CONTROL</p> <p>with</p> <p>3<sup>RD</sup> HARMONIC INJECTION</p> <p>Martin Todd Hess</p> <p>Field Oriented Control (FOC), also known as vector control, is a widely used and well documented method for controlling Permanent-Magnet Synchronous Motors (PMSM) and induction motors. Almost …
-
The optical cubic susceptibility dispersion of some transparent thin films.
… of this dissertation has been to investigate the third order nonlinear susceptibility dispersion of molecules and polymers in order to estimate their purely electronic nonlinear response and in particular their optical Kerr nonlinear susceptibility in the 1 to 2 μm infrared spectral region. We …
-
Vortex-induced vibration of a circular cylinder with combined in-line and cross-flow motion
… in this condition along with large magnitude third harmonic forces in lift. Flow visualization of the wake behind the cylinder in combined in-line and cross-flow motion, shows that third harmonic forces are caused by the relative motion of the cylinder with respect to a '2P' (two pairs of …
-
Quantum Tunneling of Charge-Density Waves in Quasi-One-Dimensional Conductors (Trichalcogenide, Tantalum Trisulfide, Niobium-Triselenide)
… dc conductivity, ac admittance, direct mixing, harmonic mixing, second harmonic generation, and third harmonic generation as functions of dc bias voltage, applied frequencies, and, in some cases, the amplitude of an additional ac signal. Measurements of the direct and harmonic mixing responses …
-
Geometric manipulation of light : from nonlinear optics to invisibility cloaks
… at frequency w1 to frequency Wk due to second or third harmonic generation or four-wave mixing using coupled-mode theory. Using this framework, we show there is a critical input power at which maximum frequency conversion is possible. We study in depth the case of third harmonic generation, its …
-
Aspectos da morfologia e biologia de Scinax ruber (Laurenti, 1768) com comentários taxonômicos (Amphibia, Anura, Hylidae)
… yellow spots; 4) oral disc of tadpoles with third inferior row of teeth remarkably shorter than second row, its length corresponding to 53.6 % of latter; 5) advertisement call presenting harmonic structure weakly modulated, with 8 to 26 short notes per call, each note with at least seven …
-
SPINS : spectral phase interrogation using nonlinear spectra
… only the measurement of the fundamental, second harmonic, and third harmonic (or other third-order nonlinear) spectra of an ultrafast pulse. An algorithm is employed to generate trial SHG and THG spectra based on the measured fundmental spectrum and a trial phase. The phase is adjusted …
-
Nonlinear optical microscopy and spectroscopy by pulse shaping of a coherent fiber supercontinuum
… visualizes endogenous fluorophores. Second and third harmonic generation microscopy maps optical non-centrosymmetry and heterogeneity. Coherent Raman scattering spectroscopic imaging probes intrinsic molecular vibrations. An integrated platform with combined modalities realizes label-free …
-
Nonlinear microscopy for material characterization
… unstudied aspects of materials. By probing third order nonlinear optical signals determined by the nonlinear susceptibility (chi-3), which is present in all materials, we gain insight not available by conventional linear or electron microscopy. Third-harmonic generation (THG) and four-wave …
-
Waveguide Integrated Optoelectronics Using Two-Dimensional Materials
… of a photodetector. Subsequent observation of third-harmonic generation led to characterization of chi(3) in black phosphorus for the first time.
-
Label-free multi-modal multiphoton imaging for real-time point-of-procedure assessment of needle biopsies
… and three-photon fluorescence, and second and third harmonic generation. Intraoperative NLOI of fresh NB specimens from tumor-bearing animals during veterinary surgeries demonstrated the potential of this system to enable real-time and point-of-procedure histological evaluation of the NB …
Page 1 of 3