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 79 for “"phase shifts"”.
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Actin's role in signaling light-induced phase shifts in the mammalian circadian clock
… actin polymerization, which is required for the phase delay to occur. I first characterized actin state around a day-night cycle, in order to determine whether sensitivity to actin depolymerization changes over this period. To this end, I showed that polymerized actin peaks in early night, but …
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Atom interferometry--dispersive index of refraction and rotation induced phase shifts for matter-waves
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Cantilever Dynamic Analysis in Tapping Mode Atomic Force Microscopy
… materials, like cells and polymer. Moreover, phase image can also be obtained from tapping mode AFM besides height and amplitude image. Phase images provide extra information on the test sample in comparison with height and amplitude images. Studies have been carried out to investigate the …
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Dynamic Metasurface Grouping for IRS Optimization in Massive MIMO Communications
… is blocked. IRSs use implementable optimized phase shifts that beamform a reflected signal around channel blockages, and because they are passive devices, they have the benefit of having low cost and low power consumption. Previous works have concluded that IRSs need several hundred elements …
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Photic entrainment and induction of immediate-early genes within the rat circadian system
… are part of the mechanism by which light induces phase shifts of circadian rhythmicity. The two most studied light-induced IEG within the rodent circadian system are Fos and Jun-B. Molecular expression of these two genes within the suprachiasmatic nucleus (SCN) correlates both in magnitude and in …
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Non-Photic Phase Shifting: Acetylcholine and Arousal
Non-photic stimuli are capable of producing large phase advances of the suprachiasmatic nuclei (SCN) during the midday in a manner that is different than light. Two prominent non-photic stimuli include confinement to a novel running wheel, and sleep deprivation by gentle handling. It was …
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Dynamic Pion Studies in Nuclear Matter
… the central and tensor parts of the potential to phase shifts and deuteron data. Dynamic pions offer a natural and physical way to handle inelasticities in phase shifts above pion-production threshold. Other observables, such as the: p,2p) analyzing power Ay, which indicate explicit energy …
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Interlocking mechanisms regulating the circadian clock response to DNA damage
… hypothesis that DNA damage caused by radiation shifts the circadian clock phase via the p53:PER2:MDM2 complex. Firstly, we generated Trp53KO (Trp53 gene encodes mouse p53) cell lines in NIH 3T3 Per2:dLuc reporter cells expressing luciferase driven by the Per2 promoter. Phase-response curves …
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Transport properties of anisotropic superconductors
… and thermal conduction in the superconducting phase of UPt3 do not behave as one would expect if the electron-impurity phase shift were small, and therefore, assuming electron-impurity scattering to be the dominant process, we have calculated transport coefficients for a range of phase shifts, …
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Software-Defined Radio Implementation of Two Physical Layer Security Techniques
… Alamouti coding system with pseudo-random phase shifts applied to each transmit antenna, referred to as Phase-Enciphered Alamouti Coding (PEAC). The intended receiver has knowledge of the pseudo-random sequence and can undo these phase shifts when performing the Alamouti equalization, while …
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Photon decay rate of sigma plus from unsubtracted dispersion relations
… They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals were carried out on a computer and the relative decay rate of Sigma+ -> py to its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± …
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Closed-form description of polarization in elastic and inelastic scattering of light and heavy ions
… the effects of much stronger real nuclear phase shifts may be included.
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Tunable Optical Group Delay in Active Semiconductor Optoelectronic Devices
… and operating regimes. A microwave photonic phase-shifter is then proposed and demonstrated using wavelength conversion in a distributed-feedback laser. This scheme provides microwave phase shifts greater than 140° over GHz bandwidths, and is relatively insensitive to the input …
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Biorhythmic patterns of blood pressure in non-surgical patients in an intensive care unit
… (2) Does the diurnal pattern of blood pressure phase shift in nonsurgical patients who are in an intensive care unit environment? The study was conducted in a 10 bed medical surgical intensive care unit (ICU). Ten subjects, 3 females (30%) and 7 males (70%) who did not have congestive heart …
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Biorhythmic patterns of blood pressure in non-surgical patients in an intensive care unit
… (2) Does the diurnal pattern of blood pressure phase shift in nonsurgical patients who are in an intensive care unit environment? The study was conducted in a 10 bed medical surgical intensive care unit (ICU). Ten subjects, 3 females (30%) and 7 males (70%) who did not have congestive heart …
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Light pulse atom interferometry at short interrogation times for inertial navigation
… time of 2T = 10 ms (based on measured phase SNR, scale factor, and repetition rate). With realistic improvements to the apparatus, it could achieve a sensitivity of <1 [mu]g[square root]Hz, advancing toward the realization of a compact, atom-based inertial measurement unit with …
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QX Pup : the fascinating yolk of the Rotten Egg Nebula
… , = 2.2 ± 0.69 are measured in I, and and phase shifts between the the other three filters and I are determined to be [o]R = 6 ± 40 days, [o]B = 66 ± 64 days, #, [o]v = 16 ± 86 days. These results are used to speculate about the possibility of a light-echo off the Rotten Egg Nebula and the …
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Construction of a Calcium Matter-Wave Interferometer
… design minimizes first-order Doppler shifts, and allows for the cancellation of systematic errors including phase shifts due to rotation and acceleration. I describe the individual components of the interferometer and its assembly. The requirements for the electronics used in the …
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Real-time quantitative phase imaging for cell studies
… to reveal the endogenous contrast, such as phase contrast microscopy (PCM) and differential interference contrast (DIC) microscopy. Although PCM and DIC methods significantly improve the image contrast without the need for staining agents, they only provide qualitative information about the …
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