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 132 for “"Direct Detection"”.
-
Boosting (in)direct detection of dark matter
In this thesis, I study the expected direct and indirect detection signals of dark matter. More precisely, I study three aspects of dark matter; I use hydrodynamic simulations to extract properties of weakly interacting dark matter that are relevant for both direct and indirect detection signals, …
-
Crosstalk in direct detection optical FDMA networks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.
-
Frequency modulated analog fiber optic links using direct detection
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
-
Direct detection optical systems : intersymbol interference and electrical filter designs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
A performace analysis of optical filters in direct detection receivers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
-
Direct detection of homocysteine and syntheses of lanthanide complexes as biosensors
… highly selective colorimetric methods for the direct determination of Hcy. Inexpensive, commercially available materials are reported. The results show potential application for the detection of Hcy in human blood plasma. Additionally, new HPLC postcolumn detection methods for biological thiols …
-
The PICO-2L program: Towards Background-Free Dark Matter Direct Detection Using Bubble Chambers
The PICO-2L program commenced in 2013 with the deployment of a 2 litre bubble chamber filled with superheated C3F8 and over the next three years, conducted two separate WIMP-search experiments. The first run was conducted at 4 different energy thresholds ranging from 3.2 keV to 8.1 keV and a total …
-
Comparing Even Isotope Xenon Form Factors and Their Impact on Dark Matter Direct Detection
I go over evidence for dark matter and different theories and particles that have been proposed to be potential dark matter candidates. I then go over how physicists search for dark matter. I also introduce DarkSUSY and use DarkSUSY to check open parameter space in the Minimal Supersymmetric …
-
Cyclic universes & direct detection of cosmic expansion by holonomy in the McVittie spacetime
… Part two is titled Thought Experiment to Directly Detect Cosmic Expansion by Holonomy. Two thought experiments are proposed to directly measure the expansion of the universe by the parallel transfer of a vector around a closed loop in a curved spacetime. Generally, expansion would cause a …
-
Measurements, analysis and modeling of the performance of direct detection receivers with an optical preamplifier
In the last few years, erbium-doped fiber amplifiers (EDFAs) have been investigated extensively both for their superior amplification characteristics and their applicability to future optical fiber communication systems. In the preamplifier configuration, a bandpass filter is required to reduce the …
-
Fluid content effect on acoustic impedance and limits of direct detection capability : illustrated on an offshore prospect
The presence of gas and oil in some sand formations decreases the seismic velocity and density to such an extent that anomalously large reflections coefficients are encountered at fluid contacts. Geerstma and Gassmann's theories are equivalent and provide a good way to study the physical properties …
-
Real Time RT-PCR for Direct Detection of Viable Mycobacterium Avium Subspecies paratuberculosis in Chron's Disease Patients and Association of Map Infection with Downregulation in Interferon-Gamma Receptor (INFG1) Gene in Crohn's Disease Patients
… In hope this real time RT-PCR may aid in the detection of viable MAP cells in Crohn's disease patients, a total of 45 clinical samples were analyzed. Portion of each sample was also subjected to 12 weeks culture followed by standard nested PCR analysis. The samples consisted of 17 cultures …
-
Rapid Scan Electron Paramagnetic Resonance (EPR) and Digital EPR Development
… approach of rapid scan, called field-stepped direct detection EPR, was developed to reconstruct wider EPR signals. A Mn<sup>2+</sup> containing crystal was measured by field-stepped direct detection EPR, which had a spectrum more than 6000 G wide. Since the field-stepped direct detection …
-
The XENON100 Dark Matter Experiment: Design, Construction, Calibration and 2010 Search Results with Improved Measurement of the Scintillation Response of Liquid Xenon to Low-Energy Nuclear Recoils
… experiment took the lead over the most sensitive direct detection dark matter search in operation, the CDMS II experiment, by probing spin-independent WIMP-nucleon interaction cross sections down to σχN ~ 5 × 10-44 cm2 at 30GeV/c2. Liquefied noble gas detectors are now among the technologies at …
-
Phase-Space Distributions of Galactic Dark Matter Halos and Implications for Detection
… from the Sommerfeld effect is considered in indirect detection; we derive an upper limit on the local velocity dispersion and examine the significance of local anisotropy in the local dark matter distribution in direct detection efforts.</p>
-
Fscan Code Development For Advanced Ligo Detector Characterization
… (LIGO) is an experiment designed to provide direct detection of gravitational waves. Its searches for periodic gravitational waves are highly susceptible to long-duration noise that appears as spectral lines. FScan is a tool for finding spectral lines and is used to identify the lines that …
-
Distributed fibre sensing using microwave heterodyne detection of spontaneous Brillouin backscatter
… well documented, with all recent cases using direct detection of the backscattered power. As the input pulse power is increased, nonlinear processes ensue, compromising the accuracy of the sensor. These processes were investigated both experimentally and theoretically for a range of input …
-
Characterization of Enhanced Interferometric Gravitational Wave Detectors and Studies of Numeric Simulations for Compact-Binary Coalescences
… consequence of the general theory of relativity. Direct detection of such waves will provide a wealth of information about physics, astronomy, and cosmology. A worldwide effort is currently underway to make the first direct detection of gravitational waves. The global network of detectors includes …
-
SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION
… improved. Although different modulation and detection techniques are used, all the multicarrier systems investigated in this dissertation achieve a high spectral efficiency of 1 Baud/s/Hz. Orthogonal frequency-division multiplexing (OFDM) and Nyquist wavelength-division multiplexing …
-
Development of ultracompact, high-sensitivity, space-based instrumentation for far-infrared and submillimeter astronomy
… enable this science are ultra-low-noise, far-IR, direct-detection spectrometers. In this thesis, Micro-Spec ([mu]-Spec) is proposed as a novel technology concept to enable a large range of flight missions that would otherwise be challenging due to the large size of current instruments and the …
Page 1 of 7