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Articles 3301 - 3330 of 3756
Full-Text Articles in Physical Sciences and Mathematics
Tr-2011005: First-Order Logic Of Proofs, Sergei N. Artemov, Tatiana Yavorskaya (Sidon)
Tr-2011005: First-Order Logic Of Proofs, Sergei N. Artemov, Tatiana Yavorskaya (Sidon)
Computer Science Technical Reports
No abstract provided.
Tr-2011011: Randomized And Derandomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Tr-2011011: Randomized And Derandomized Matrix Computations Ii, Victor Y. Pan, Guoliang Qian, Ai-Long Zheng
Computer Science Technical Reports
No abstract provided.
Tr-2011010: Possible World Semantics For First Order Lp, Melvin Fitting
Tr-2011010: Possible World Semantics For First Order Lp, Melvin Fitting
Computer Science Technical Reports
No abstract provided.
Tr-2011002: Symbolic Lifting For Structured Linear Systems Of Equations: Numerical Initialization, Nearly Optimal Boolean Cost, Variations, And Extensions, Victor Y. Pan
Computer Science Technical Reports
No abstract provided.
Tr-2011003: Partial Fraction Decomposition, Sylvester Matrices, Convolution And Newton's Iteration, Victor Y. Pan
Tr-2011003: Partial Fraction Decomposition, Sylvester Matrices, Convolution And Newton's Iteration, Victor Y. Pan
Computer Science Technical Reports
No abstract provided.
Tr-2011008: The Ontology Of Justifications In The Logical Setting, Sergei N. Artemov
Tr-2011008: The Ontology Of Justifications In The Logical Setting, Sergei N. Artemov
Computer Science Technical Reports
No abstract provided.
Tr-2011009: Solving Linear Systems Of Equations With Randomized Augmentation And Aggregation, Victor Y. Pan, Guoliang Qian
Tr-2011009: Solving Linear Systems Of Equations With Randomized Augmentation And Aggregation, Victor Y. Pan, Guoliang Qian
Computer Science Technical Reports
No abstract provided.
A View Of The Universe From Siue’S Campus, Aldemaro Romero Jr.
A View Of The Universe From Siue’S Campus, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Moving Towards Adaptive Search In Digital Libraries, Udo Kruschwitz, M-Dyaa Albakour, Jinzhong Niu, Johannes Leveling, Nikolaos Nanas, Yunhyong Kim, Dawei Song, Maria Fasli, Anne De Roeck
Moving Towards Adaptive Search In Digital Libraries, Udo Kruschwitz, M-Dyaa Albakour, Jinzhong Niu, Johannes Leveling, Nikolaos Nanas, Yunhyong Kim, Dawei Song, Maria Fasli, Anne De Roeck
Publications and Research
Information retrieval has become very popular over the last decade with the advent of the Web. Nevertheless, searching on the Web is very different to searching on smaller, often more structured collections such as digital libraries, local Web sites and intranets. One way of helping the searcher locating the right information for a specific information need is by providing well-structured domain knowledge to assist query modification and navigation. There are two challenges: acquiring the domain knowledge and adapting it automatically to the specific interests of the user community. We will outline how a domain model can be automatically acquired using …
Climate Change: The Fork At The End Of Now, Micha Tomkiewicz
Climate Change: The Fork At The End Of Now, Micha Tomkiewicz
Publications and Research
There are many books on global warming written entirely from a layman's perspective, and there is a great deal of scientific literature on this subject. But few if any books attempt to bridge the science to those who lack a rigorous background in mathematics, physics and chemistry-but who may be working on careers in environmental science and policy. The new text is designed to introduce the field of global climate change from a scientific perspective-but written in a way that is accessible to students with some or little science background. It reviews the basic principles of climatic thermodynamics and atmospheric …
The Maximum Rectilinear Crossing Number Of The Wheel Graph, Elie Feder
The Maximum Rectilinear Crossing Number Of The Wheel Graph, Elie Feder
Publications and Research
We find and prove the maximum rectilinear crossing number of the wheel graph. First, we illustrate a picture of the wheel graph with many crossings to prove a lower bound. We then prove that this bound is sharp. The treatment is divided into two cases for n even and n odd.
Dissipative Macroscopic Quantum Tunneling In Type-I Superconductors, Ricardo Zarzuela, Eugene M. Chudnovsky, Javier Tejada
Dissipative Macroscopic Quantum Tunneling In Type-I Superconductors, Ricardo Zarzuela, Eugene M. Chudnovsky, Javier Tejada
Publications and Research
We study macroscopic quantum tunneling of interfaces separating normal and superconducting regions in type-I superconductors. Mathematical model is developed, that describes dissipative quantum escape of a two-dimensional manifold from a planar potential well. It corresponds to, e.g., a current-driven quantum depinning of the interface from a grain boundary or from artificially manufactured pinning layer. Effective action is derived and instantons of the equations of motion are investigated. Crossover between thermal activation and quantum tunneling is studied and the crossover temperature is computed. Our results, together with recent observation of non-thermal low-temperature magnetic relaxation in lead, suggest possibility of a controlled …
A Bulk Inflaton From Large-Volume Extra Dimensions, Brian Greene, Daniel N. Kabat, Janna Levin, Dylan Thurston
A Bulk Inflaton From Large-Volume Extra Dimensions, Brian Greene, Daniel N. Kabat, Janna Levin, Dylan Thurston
Publications and Research
The universe may have extra spatial dimensions with large volume that we cannot perceive because the energy required to excite modes in the extra directions is too high. Many examples are known of such manifolds with a large volume and a large mass gap. These compactifications can help explain the weakness of four-dimensional gravity and, as we show here, they also have the capacity to produce reasonable potentials for an inflaton field. Modeling the inflaton as a bulk scalar field, it becomes very weakly coupled in four dimensions, and this enables us to build phenomenologically acceptable inflationary models with tunings …
Ssgss: The Spitzer-Sdss-Galex Spectroscopic Survey, Matthew J. O'Dowd, David Schiminovich, Benjamin D. Johnson, Marie A. Treyer
Ssgss: The Spitzer-Sdss-Galex Spectroscopic Survey, Matthew J. O'Dowd, David Schiminovich, Benjamin D. Johnson, Marie A. Treyer
Publications and Research
The Spitzer-SDSS-GALEX Spectroscopic Survey (SSGSS) provides a new sample of 101 star-forming galaxies at z < 0.2 with unprecedented multi-wavelength coverage. New mid- to far-infrared spectroscopy from the Spitzer Space Telescope is added to a rich suite of previous imaging and spectroscopy, including ROSAT, Galaxy Evolution Explorer, Sloan Digital Sky Survey, Two Micron All Sky Survey, and Spitzer/SWIRE. Sample selection ensures an even coverage of the full range of normal galaxy properties, spanning two orders of magnitude in stellar mass, color, and dust attenuation. In this paper we present the SSGSS data set, describe the science drivers, and detail the sample selection, observations, data reduction, and quality assessment. Also in this paper, we compare the shape of the thermal continuum and the degree of silicate absorption of these typical, star-forming galaxies to those of starburst galaxies. We investigate the link between star formation rate, infrared luminosity, and total polycyclic aromatic hydrocarbon luminosity, with a view to calibrating the latter for spectral energy distribution models in photometric samples and at high redshift. Last, we take advantage of the 5-40 micron spectroscopic and far-infrared photometric coverage of this sample to perform detailed fitting of the Draine et al. dust models, and investigate the link between dust mass and star formation history and active galactic nucleus properties.
Mount Graham, Janet Butler Munch
Mount Graham, Janet Butler Munch
Publications and Research
Mount Graham, in southern Arizona, is considered a sacred location by the Apaches. The remoteness and high elevation of the mountain makes it an ideal location for astronomical research. After protracted litigation suits, the University of Arizona prevailed and was allowed to establish the Mount Graham International Observatory on the site.
Introduction To Gis Using Open Source Software, 1st Ed, Frank Donnelly
Introduction To Gis Using Open Source Software, 1st Ed, Frank Donnelly
Open Educational Resources
This tutorial was created to accompany the GIS Practicum, a day-long workshop offered by the Newman Library at Baruch College CUNY that introduces participants to geographic information systems (GIS) using the open source software QGIS. The practicum introduces GIS as a concept for envisioning information and as a tool for conducting geographic analyses and creating maps. Participants learn how to navigate a GIS interface, how to prepare layers and conduct a basic geographic analysis, and how to create thematic maps. This tutorial was written using QGIS version 1.5 "Tethys", a cross-platform (Windows, Mac, Linux) desktop GIS software package.
Dea With A Perfect Object: Analytical Solutions, Alexander Vaninsky
Dea With A Perfect Object: Analytical Solutions, Alexander Vaninsky
Publications and Research
For the main DEA models, adding a Perfect Object—that is, a virtual object that has the smallest inputs and greatest outputs—to a collection of actual objects permits obtaining solutions analytically. The paper derives formulas for the solutions and demonstrates that computations with them comprise simple operations with ratios of inputs and outputs while avoiding the use of linear programming (LP) algorithms. A numerical example illustrates the utility of the approach.
Associate Professor Makes Mark Composing, Aldemaro Romero Jr.
Associate Professor Makes Mark Composing, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Roofs Of Our Homes May Be Green Tomorrow, Aldemaro Romero Jr.
Roofs Of Our Homes May Be Green Tomorrow, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Statistician Recommends A Dose Of Skepticism, Aldemaro Romero Jr.
Statistician Recommends A Dose Of Skepticism, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Physics Professor Leads Research Into Laser Uses, Aldemaro Romero Jr.
Physics Professor Leads Research Into Laser Uses, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Neath Studies, Teaches The Uncertainties Of Life, Aldemaro Romero Jr.
Neath Studies, Teaches The Uncertainties Of Life, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Synthesis Of Alkynyl Ribofuranosides, Christian Rodriguez
Synthesis Of Alkynyl Ribofuranosides, Christian Rodriguez
Dissertations and Theses
No abstract provided.
Complexity Of Minimum Corridor Guarding Problems, Ning Xu
Complexity Of Minimum Corridor Guarding Problems, Ning Xu
Dissertations and Theses
"In this paper, the complexity of minimum corridor guarding problems is discussed. These problem can be described as: given a connected orthogo-nal arrangement of vertical and horizontal line segments and a guard with unlimited visibility along a line segment, find a tree or a closed tour with minimum total length along edges of the arrangement, such that if the guard runs on the tree or on the closed tour, all line segments are visited by the guard. These problems are proved to be NP-complete. Keywords: computational complexity, computational geometry, corridor guarding, NP-complete"
Parallel Computing With Improved Techniques For Monte Carlo Simulation In Var, Ping Hung Wu
Parallel Computing With Improved Techniques For Monte Carlo Simulation In Var, Ping Hung Wu
Dissertations and Theses
"Value at Risk ( VaR ) is a widely used tool for the assessment of one’s investments. VaR is used to evaluate the risk of loss on a financial portfolio. This metric can be computed in several ways. In the historical approach, past trends of the appropriate combination of stocks is used to estimate current portfolio fluctuations. The variance – covariance method, meanwhile, seeks to discover relationships in price fluctuations for one’s stocks. Finally, Monte Carlo simulation capitalizes upon the stochastic nature of stock prices to predict future value. This latter approach, however, relies heavily on the multiplication of vectors …
Synthesis And Characterization Of Pbte Quantum Dots, Faiza Anwar
Synthesis And Characterization Of Pbte Quantum Dots, Faiza Anwar
Dissertations and Theses
No abstract provided.
Quantum Entanglement Of A Tunneling Spin With Mechanical Modes Of A Torsional Resonator, Dmitry A. Garanin, Eugene M. Chudnovsky
Quantum Entanglement Of A Tunneling Spin With Mechanical Modes Of A Torsional Resonator, Dmitry A. Garanin, Eugene M. Chudnovsky
Publications and Research
We solve Schr\"odinger equation describing a tunneling macrospin coupled to a torsional oscillator. Energy spectrum is studied for various quantum regimes. Magnetic susceptibility and noise spectrum are computed. We show that entanglement of the spin with mechanical modes of a subnanometer oscillator results in the decoherence of spin tunneling. For larger oscillators the presence of a tunneling spin can be detected through splitting of the mechanical mode at the resonance. Our results apply to experiments with magnetic molecules coupled to nanoresonators.
Renormalization Of The Tunnel Splitting In A Rotating Nanomagnet, Michael F. O'Keeffe, Eugene M. Chudnovsky
Renormalization Of The Tunnel Splitting In A Rotating Nanomagnet, Michael F. O'Keeffe, Eugene M. Chudnovsky
Publications and Research
We study spin tunneling in a magnetic nanoparticle with biaxial anisotropy that is free to rotate about its anisotropy axis. Exact instanton of the coupled equations of motion is found that connects degenerate classical energy minima. We show that mechanical freedom of the particle renormalizes magnetic anisotropy and increases the tunnel splitting.
Quantum Tunneling Of The Interfaces Between Normal-Metal And Superconducting Regions Of A Type-I Pb Superconductor, Eugene M. Chudnovsky, S Velez, A Garcia-Santiago, J A. Hernandez
Quantum Tunneling Of The Interfaces Between Normal-Metal And Superconducting Regions Of A Type-I Pb Superconductor, Eugene M. Chudnovsky, S Velez, A Garcia-Santiago, J A. Hernandez
Publications and Research
Evidence of a non-thermal magnetic relaxation in the intermediate state of a type-I superconducor is presented. It is attributed to quantum tunneling of interfaces separating normal and superconducting regions. Tunneling barriers are estimated and temperature of the crossover from thermal to quantum regime is obtained from Caldeira-Leggett theory. Comparison between theory and experiment points to tunneling of interface segments of size comparable to the coherence length, by steps of order one nanometer.
Thermal Diffractive Corrections To Casimir Energies, Daniel N. Kabat, Dimitra Karabali
Thermal Diffractive Corrections To Casimir Energies, Daniel N. Kabat, Dimitra Karabali
Publications and Research
We study the interplay of thermal and diffractive effects in Casimir energies. We consider plates with edges, oriented either parallel or perpendicular to each other, as well as a single plate with a slit. We compute the Casimir energy at finite temperature using a formalism in which the diffractive effects are encoded in a lower dimensional non-local field theory that lives in the gap between the plates. The formalism allows for a clean separation between direct or geometric effects and diffractive effects, and makes an analytic derivation of the temperature dependence of the free energy possible. At low temperatures, with …