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 47 for “"Background radiation"”.
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The investigation of soil dielectric influence towards terrestrial background radiation
A study on correlation between terrestrial radiation and dielectric property of various soil species in Johor state, Malaysia were investigated in this research. Total 11 soil species were randomly selected around Batu Pahat, Kluang and Johor Bahru. The soil species identified were Kranji, …
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Measuring cosmic microwave background radiation anisotropy on medium angular scales
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Quasi-Optical Design and Analysis of a Bolometric Interferometer for Cosmic Microwave Background Radiation Experiments
… the idea of observing the Cosmic Microwave Background (CMB) in order to determine its polarisation properties, i.e. E- and B-modes. B-modes, a smoking gun for inflation theory, are a long sought after observation for cosmologists. From this the QUBIC collaboration was born. Here we explore …
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A measurement of the cosmic microwave background radiation (CMBR) anisotropy at the half degree angular scale
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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A comparison of geostatistcal interpolation methods for the characterization of background radiation collected on a mobile sensor network in a cloud computing environment
… the presence of permanent human-made background radiation sources like buildings and monuments and natural fluctuations in background radiation can make detecting illicit radioactive sources with methods relying on simple radiation thresholds challenging. If the background radiation is …
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Reconstruction of urban radiation landscape using machine learning methods
Efficiently monitoring a geographic region's radiation level and detecting anomalous radiation sources is an essential issue in homeland security. This task includes identifying illicit movement of special nuclear material, locating unusual radioactive events, and estimating the intensity of …
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Geoneutrino production of the northern Black Hills, South Dakota, United States of America
… to isolate the detector from cosmic rays and background radiation. However, background radiation from local sources has yet to be accounted for. Current models for neutrino contributions from terrestrial rocks are formulated from bulk compositional estimates of the whole Earth. To better …
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Mobile radiation sensor networks for source detection in a fluctuating background using geo-tagged count rate data
Mobile radiation sensor networks integrated with geographic information system provide an attractive option for the real-time anomalous radiation source detection. In order to obtain an accurate alarm of the presence of an anomalous radiation source, continuous measurements of the temporal and …
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Estimation of the strength of a radioactive source
… We distinguish two main cases according as the background radiation is small or large. In the former case the common procedure of simply subtracting off a constant background radiation is adequate. If the background radiation is neglected altogether the method of maximum likelihood may be used …
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Implementation and simulation of mobile sensor networks for nuclear radiation detection
… of special nuclear materials, nuclear radiation detection plays an important role in national security applications. However, changing background radiation, shielding effects, and short collection time make radiation detection a challenging problem. Anomaly detection, source …
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Early universe cosmology as a probe of fundamental physics
… particular, observations of the cosmic microwave background radiation supports the idea for an early phase of accelerated expansion called inflation. While the simplest inflationary models provide a consistent theoretical framework in explaining observational data, we are yet to understand the …
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Radiation source detection from mobile sensor networks using principal component analysis
… large areas is challenging because of changing background radiation, shielding effects and short collection time, especially when the radioactive materials are moving. The concept of mobile sensor networks is put forward to solve this problem. In this thesis, a small mobile sensor network is …
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Multifield inflation and differential geometry
… non-gaussianities in the cosmic microwave background radiation spectrum.
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An air sampling system to estimate concentrations of argon-41 in the V.P.I. physics building during reactor operation
… was assembled. and calibrated in a low background radiation area to analyze air samples. Air samples were taken from different locations in the physics building during reactor operation to determine the concentrations of A⁴¹ released to the surroundings of the building during reactor …
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An evaluation of the natural radioactivity in the soils of Okahandja and Karibib, Namibia
… result implies that the two towns have normal background radiation. Also, the results of 163.0 ± 22.6 Bq/kg and 167.1 ± 40.1 Bq/kg obtained for the Radium equivalent activities, Raeq, in Karibib and Okahandja respectively are much lower than the recommended maximum value of 370 Bq/kg thus …
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Statistical methods for the search of high energy neutrinos from galactic sources in KM3NeT and ANTARES telescopes
… on the low energy photons from the cosmic background radiation. This limits the path length of a 10 TeV photon, for example, to roughly the distance of the nearest active galaxy. In contrast, neutrinos o er a means to study the universe at very high energies or large distances. Very high …
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Supersymmetry, supergravity, and String Theory based inflationary cosmology
… precision measurements of the cosmic microwave background radiation. This comparison is achieved using observable derived constraints of the spectral index and tensor to scalar ratio.
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Data Analysis of the Cosmic Microwave Background
… about the origin of the universe. This radiation which has travelled more or less unchanged from the earliest times until today is called the cosmic microwave background radiation, and is the topic of this Ph.D. thesis.
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Martingales, Singular Integrals, and Fourier Multipliers
… of martingale transforms with respect to the background radiation process of Gundy and Varapolous or with respect to space-time Brownian motion, satisfy the assumptions of Calderón-Zygmund theory and therefore boundedly map <em>L1</em> to weak-<em> L1.</em></p> <p>We will also use a method of …
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