Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physics (34)
- Chemistry (25)
- Computer Sciences (14)
- Engineering (14)
- Earth Sciences (13)
-
- Applied Mathematics (10)
- Condensed Matter Physics (10)
- Mathematics (9)
- Geology (7)
- Life Sciences (7)
- Physical Chemistry (7)
- Statistics and Probability (6)
- Inorganic Chemistry (5)
- Organic Chemistry (5)
- Other Applied Mathematics (5)
- Applied Statistics (4)
- Astrophysics and Astronomy (4)
- Biomedical Engineering and Bioengineering (4)
- Geophysics and Seismology (4)
- Other Physics (4)
- Analytical Chemistry (3)
- Atomic, Molecular and Optical Physics (3)
- Biochemistry, Biophysics, and Structural Biology (3)
- Biological and Chemical Physics (3)
- Elementary Particles and Fields and String Theory (3)
- Materials Chemistry (3)
- Medicine and Health Sciences (3)
- Nuclear (3)
- Optics (3)
- Institution
- Keyword
-
- Pure sciences (3)
- Amide (2)
- Applied sciences (2)
- Complex oxides (2)
- Copper (2)
-
- Physics (2)
- Scintillators (2)
- 1 (1)
- 16S rRNA (1)
- 2 (1)
- 4-triazines (1)
- 81Ge (1)
- <p>Decision support systems<br />Decision making -- Data processing<br />Reasoning -- Computer simulation<br />Logic -- Computer simulation</p> (1)
- <p>Ferromagnetic materials -- Fluctuations<br />Neutrons -- Diffraction<br />Calcium titanate<br />Transition metal compounds<br />Magnetoresistance<br />Energy levels (Quantum mechanics)</p> (1)
- <p>Phase transformations (Statistical physics)<br />Order-disorder models<br />Quantum theory -- Mathematical models<br />Percolation<br />Nonequilibrium statistical mechanics</p> (1)
- <p>Stars -- Formation<br />Stars -- Clusters<br />Stars (1)
- ASICs (1)
- Acylhomoserine lactone (1)
- Ad hoc networks (Computer networks)<br />Computer networks -- Reliability<br />Adaptive routing (Computer network management)<br />Computer networks -- Security measures (1)
- AdS CFT correspondence (1)
- Adsorption (1)
- Aeolian systems (1)
- Aerogels -- Design<br />Nanostructured materials -- Design<br />Aerogels -- Structure-activity relationships<br />Crosslinking (Polymerization)<br />Rheology<br />Small-angle x-ray scattering (1)
- Aerogels -- Mechanical properties<br />Crosslinking (Polymerization)<br />Porous materials<br />Chemical kinetics -- Effect of temperature on<br />Phenolic resins (1)
- Affymetrix microarray images (1)
- Alkane (1)
- Amidinate (1)
- Anthropogenic disturbance (1)
- Apatite (1)
- Applied math (1)
Articles 91 - 100 of 100
Full-Text Articles in Physical Sciences and Mathematics
Location Based Services In Wireless Ad Hoc Networks, Neelanjana Dutta
Location Based Services In Wireless Ad Hoc Networks, Neelanjana Dutta
Doctoral Dissertations
"In this dissertation, we investigate location based services in wireless ad hoc networks from four different aspects - i) location privacy in wireless sensor networks (privacy), ii) end-to-end secure communication in randomly deployed wireless sensor networks (security), iii) quality versus latency trade-off in content retrieval under ad hoc node mobility (performance) and iv) location clustering based Sybil attack detection in vehicular ad hoc networks (trust). The first contribution of this dissertation is in addressing location privacy in wireless sensor networks. We propose a non-cooperative sensor localization algorithm showing how an external entity can stealthily invade into the location privacy of …
Sparse Group Sufficient Dimension Reduction And Covariance Cumulative Slicing Estimation, Bilin Zeng
Sparse Group Sufficient Dimension Reduction And Covariance Cumulative Slicing Estimation, Bilin Zeng
Doctoral Dissertations
"This dissertation contains two main parts: In Part One, for regression problems with grouped covariates, we adopt the idea of sparse group lasso (Friedman et al., 2010) to the framework of the sufficient dimension reduction. We propose a method called the sparse group sufficient dimension reduction (sgSDR) to conduct group and within group variable selections simultaneously without assuming a specific model structure on the regression function. Simulation studies show that our method is comparable to the sparse group lasso under the regular linear model setting, and outperforms sparse group lasso with higher true positive rates and substantially lower false positive …
Palynology Of Acid-Saline Lakes Of Western Australiabiostratigraphy And Paleoenvironmental Reconstruction, Carlos A. Sanchez Botero
Palynology Of Acid-Saline Lakes Of Western Australiabiostratigraphy And Paleoenvironmental Reconstruction, Carlos A. Sanchez Botero
Doctoral Dissertations
"Lakes are excellent repositories of fossils and sedimentary features that provide clues to past climatic and geologic events. Sediments from four cores drilled in Lake Aerodrome (LA1-09, LA2-09) and Lake Brown (LB1-09, LB2-09), two of the hundreds of ephemeral lakes in southern Western Australia, were analyzed for their palynological contents to understand the geologic and climatic evolution of the depositional basin. Palynofacies assemblages defined by statistical analyses of dispersed organic matter suggested differences in the depositional conditions and probable correlations between Lake Aerodrome cores. Detailed identifications and quantification of organic-walled microfossils yielded two palynomorph assemblages that reflect a climatic turnover: …
Polybenzoxazine Aerogels: Synthesis, Characterization, Conversion To Porous Carbons, And Energetic Composites, Shruti Mahadik-Khanolkar
Polybenzoxazine Aerogels: Synthesis, Characterization, Conversion To Porous Carbons, And Energetic Composites, Shruti Mahadik-Khanolkar
Doctoral Dissertations
"Aerogels are nanoporous, low-density bulk objects, consisting of three-dimensional assemblies of nanoparticle. Structured similarly, polymeric aerogels are emerging as a mechanically strong alternative to traditional silica aerogels, which are fragile. Amongst polymeric aerogels, those based on polybenzoxazine (PBO - a type of phenolic resin), are extremely robust and comprise an economic alternative to resorcinol-formaldehyde aerogels, also a class of phenolic resins, as the main source of carbon aerogels. The drawback of the PBO chemistry has been the long (days) processing time at high-temperatures (>130 ºC). Herewith, we have developed an energy- and time-efficient process to PBO aerogels by inducing …
Privacy-Preserving Friend Recommendations In Online Social Networks, Bharath Kumar Samanthula
Privacy-Preserving Friend Recommendations In Online Social Networks, Bharath Kumar Samanthula
Doctoral Dissertations
"Online social networks, such as Facebook and Google+, have been emerging as a new communication service for users to stay in touch and share information with family members and friends over the Internet. Since the users are generating huge amounts of data on social network sites, an interesting question is how to mine this enormous amount of data to retrieve useful information. Along this direction, social network analysis has emerged as an important tool for many business intelligence applications such as identifying potential customers and promoting items based on their interests. In particular, since users are often interested to make …
Study Of Artificially Disordered Optical Fibers, Herath Mudiyanselage Sumudu Rasika Kumari Herath
Study Of Artificially Disordered Optical Fibers, Herath Mudiyanselage Sumudu Rasika Kumari Herath
Doctoral Dissertations
"Light transmission through photo-sensitive multi-mode fibers (MMF) with controlled volume disorder is investigated. Experiment shows that a segment of disordered MMF as short as 10 cm is sufficient to distribute power uniformly over all co-propagating modes and the intensity at the output surface of the fiber follows the Rayleigh negative exponential function. To explain the experimental findings, a comprehensive theoretical model is developed with three main results. First, statistical properties of all components of the dielectric tensor are obtained and analyzed in the framework a microscopical model of photo-sensitivity in a germano-silicate glasses. Secondly, it is shown that induced birefringence …
Geochemical And Isotopic Characterization Of Lead In Fugitive Dust From Unsurfaced Roads In Missouri, Emitt C. Witt
Geochemical And Isotopic Characterization Of Lead In Fugitive Dust From Unsurfaced Roads In Missouri, Emitt C. Witt
Doctoral Dissertations
"Eighteen unsurfaced roadways in Missouri's rural Ozark region were sampled to characterize the differences in trace element and isotopic chemistry to determine if there is a human health concern with inhaling and/or ingestion of fugitive dust generated by a moving vehicle. Road reaches were selected to represent those in similar rural areas with and without the presence of mining activity--13 roads were selected in the Viburnum Trend (VT) resource mining area and five were located to the southwest of the mining areas. Samples were collected using a novel cyclonic fugitive dust sampler (patent pending) that collects a composite sample from …
Optical Spectroscopic Studies Of Two Star Forming Regions, Kristen Leilani Erickson
Optical Spectroscopic Studies Of Two Star Forming Regions, Kristen Leilani Erickson
Doctoral Dissertations
"The ρ Ophiuchi and Serpens molecular clouds are sites of low mass star formation. The goals of this study were to identify young stellar objects (YSOs) and estimate ages and masses in order to infer an initial mass function (IMF), investigate disk evolution, and determine the star-forming history. Optical spectroscopic surveys of an unbiased sample of candidate young stars have been completed. Optical images taken in different photometric bands were used to create color-magnitude diagrams from which sources were selected for spectroscopic observation. In combination with published data, 135 association members in ρ Ophiuchi and 63 association members plus 16 …
Phase Transitions In Disordered Systems, Fawaz Y. Hrahsheh
Phase Transitions In Disordered Systems, Fawaz Y. Hrahsheh
Doctoral Dissertations
"Disorder can have a wide variety of consequences for the physics of phase transitions. Some transitions remain unchanged in the presence of disorder while others are completely destroyed. In this thesis we study the effects of disorder on several classical and quantum phase transitions in condensed matter systems. After a brief introduction, we study the ferromagnetic phase transition in a randomly layered Heisenberg magnet using large-scale Monte-Carlo simulations. Our results provide numerical evidence for the exotic infinite-randomness scenario. We study classical and quantum smeared phase transitions in substitutional alloys A₁₋ₓBₓ. Our results show that the disorder completely destroys the phase …
Quantum Phase Transitions In Impurity Models And Percolating Lattices, Manal M. Al-Ali
Quantum Phase Transitions In Impurity Models And Percolating Lattices, Manal M. Al-Ali
Doctoral Dissertations
"This thesis investigates the influence of random disorder and dissipation on zero-temperature quantum phase transitions. Both phenomena can fundamentally change the character of the phases of a quantum many-particle system and of the transitions between them. If dissipation and disorder occur simultaneously in a system undergoing a quantum phase transition, particularly strong effects can be expected. In the first paper reproduced in this thesis, we study a single quantum rotor coupled to a sub-Ohmic dissipative bath. We find that this system undergoes a quantum phase transition from a delocalized phase to a localized phase as the dissipation strength is increased. …