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Articles 1981 - 2010 of 2397
Full-Text Articles in Entire DC Network
Constructing Local Bulk Observables In Interacting Ads/Cft, Daniel N. Kabat, Gilad Lifschytz, David A. Lowe
Constructing Local Bulk Observables In Interacting Ads/Cft, Daniel N. Kabat, Gilad Lifschytz, David A. Lowe
Publications and Research
Local operators in the bulk of AdS can be represented as smeared operators in the dual CFT. We show how to construct these bulk observables by requiring that the bulk operators commute at spacelike separation. This extends our previous work by taking interactions into account. Large-N factorization plays a key role in the construction. We show diagrammatically how this procedure is related to bulk Feynman diagrams.
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 …
Teacher Collaboration: Implications For New Mathematics Teachers, Laura M. Gellert, Lidia Gonzalez
Teacher Collaboration: Implications For New Mathematics Teachers, Laura M. Gellert, Lidia Gonzalez
Publications and Research
One increasingly popular way of supporting new teachers is through the use of mentoring. New teachers are often paired with mentors as one of a number of supports meant to aid new teachers as they begin their career. The various types of mentoring range from school based mentors assigned by the school to specialty mentors, such as math coaches. Examples of other types of supports that are thought of as separate from formal mentoring are lesson studies, professional development schools, professional development workshops supported by local universities, teacher networks and sponsored professional development. Given the popularity of policies promoting support …
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.
Henryk Archacki, John A. Drobnicki
Henryk Archacki, John A. Drobnicki
Publications and Research
Henryk Archacki was a journalist and artist who not only preserved the memory of various Poles and Polish-Americans by illustrating and writing about them, but who was involved in honoring and preserving the mortal remains of some of them.
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 …
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.
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 …
Differential Microlensing Measurements Of Quasar Broad-Line Kinematics In Q2237+0305, Matthew J. O'Dowd, N F. Bate, R L. Webster, R Wayth
Differential Microlensing Measurements Of Quasar Broad-Line Kinematics In Q2237+0305, Matthew J. O'Dowd, N F. Bate, R L. Webster, R Wayth
Publications and Research
The detailed workings of the central engines of powerful quasars remain a mystery. This is primarily due to the fact that, at their cosmological distances, the inner regions of these quasars are spatially unresolvable. Reverberation mapping is now beginning to unlock the physics of the Broad Emission Line Region (BELR) in nearby, low-luminosity quasars, however it is still unknown whether this gas is dominated by virial motion, by outflows, or infall. The challenge is greater for more distant, powerful sources due to the very long response time of the BELR to changes in the continuum. We present a new technique …
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.
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.
Six Titans Of The Cambridge School: A Review Article, Harvey Gram
Six Titans Of The Cambridge School: A Review Article, Harvey Gram
Publications and Research
Six volumes in the Great Thinker in Economics Series were chosen by the Editors for this review, which focuses on The Cambridge School of Economics, so very different from the mainstream theory of general economic equilibrium which gives formal expression to Lionel Robbins’ famous definition of the subject as the allocation of scarce means among alternative uses. In recognition of a distinct Cambridge School, the authors of these volumes present a variety of arguments within which three overlapping themes can be discerned: the relationship between ethics and economics; the role of stocks and flows in economic analysis; and the epistemic …
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.
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.
Open Access And Liberal Education: A Look At Armenia, Azerbaijan And Georgia, D. Aram Donabedian, John Carey
Open Access And Liberal Education: A Look At Armenia, Azerbaijan And Georgia, D. Aram Donabedian, John Carey
Publications and Research
In the post-Soviet era, libraries in Armenia, Azerbaijan and Georgia have faced increasing budgetary challenges. In response to socioeconomic restructuring and the introduction of private enterprise, libraries have been forced to seek alternatives to commercial publishing and licensing models. This paper will assess the status of the open access movement and of Internet filtering controls in the countries of the South Caucasus. It will also argue that developing open models for scholarly communications is crucial to the strengthening of liberal education and civic participation in these aspiring democracies. Libraries, in their role as providers of and advocates for shared information, …
The C.R.E.A.T.E. Approach To Primary Literature Shifts Undergraduates’ Self-Assessed Ability To Read And Analyze Journal Articles, Attitudes About Science, And Epistemological Beliefs, Sally G. Hoskins, David Lopatto, Leslie M. Stevens
The C.R.E.A.T.E. Approach To Primary Literature Shifts Undergraduates’ Self-Assessed Ability To Read And Analyze Journal Articles, Attitudes About Science, And Epistemological Beliefs, Sally G. Hoskins, David Lopatto, Leslie M. Stevens
Publications and Research
The C.R.E.A.T.E. (Consider,Read, Elucidate hypotheses, Analyze and interpret data, Think of the next Experiment)method uses intensive analysis of primary literature in the undergraduate classroom to demystify and humanize science. We have reported previously that the method improves students’ critical thinking and content integration abilities, while at the same time enhancing their self-reported understanding of “who does science, and why.” We report here the results of an assessment that addressed C.R.E.A.T.E. students’ attitudes about the nature of science, beliefs about learning, and confidence in their ability to read, analyze, and explain research articles. Using a Likert-style survey administered pre- and postcourse, …
Graphs Of Bounded Degree And The P-Harmonic Boundary, Michael J. Puls
Graphs Of Bounded Degree And The P-Harmonic Boundary, Michael J. Puls
Publications and Research
Let p be a real number greater than one and let G be a connected graph of bounded degree. We introduce the p-harmonic boundary of G and use it to characterize the graphs G for which the constant functions are the only p-harmonic functions on G. We show that any continuous function on the p-harmonic boundary of G can be extended to a function that is p-harmonic on G. We also give some properties of this boundary that are preserved under rough-isometries. Now let Gamma be a finitely generated group. As an application of our results, we characterize the vanishing …
Hybrid Micro-/Nanogels For Optical Sensing And Intracellular Imaging, Weitai Wu, Shuiqin Zhou
Hybrid Micro-/Nanogels For Optical Sensing And Intracellular Imaging, Weitai Wu, Shuiqin Zhou
Publications and Research
Hybrid micro-/nanogels are playing an increasing important part in a diverse range of applications, due to their tunable dimensions, large surface area, stable interior network structure, and a very short response time. We review recent advances and challenges in the developments of hybrid micro-/nanogels toward applications for optical sensing of pH, temperature, glucose, ions, and other species as well as for intracellular imaging. Due to their unique advantages, hybrid micro-/nanogels as optical probes are attracting substantial interests for continuous monitoring of chemical parameters in complex samples such as blood and bioreactor fluids, in chemical research and industry, and in food …
A Microfluidic Device To Establish Concentration Gradients Using Reagent Density Differences, Qingjun Kong, Richard A. Able, Jr., Veronica Dudu, Maribel Vazquez
A Microfluidic Device To Establish Concentration Gradients Using Reagent Density Differences, Qingjun Kong, Richard A. Able, Jr., Veronica Dudu, Maribel Vazquez
Publications and Research
Microfabrication has become widely utilized to generate controlled microenvironments that establish chemical concentration gradients for a variety of engineering and life science applications. To establish microfluidic flow, the majority of existing devices rely upon additional facilities, equipment, and excessive reagent supplies, which together limit device portability as well as constrain device usage to individuals trained in technological disciplines. The current work presents our laboratory-developed bridged microLane system, which is a stand-alone device that runs via conventional pipette loading and can operate for several days without need of external machinery or additional reagent volumes. The bridged microLane is a two-layer polydimethylsiloxane …
The Financial Crisis: What Went Wrong And What Is Needed To Make It Right, Callum Mccarthy
The Financial Crisis: What Went Wrong And What Is Needed To Make It Right, Callum Mccarthy
Publications and Research
In this paper, the WCIB is publishing remarks delivered by Sir Callum McCarthy, Former Chairman of the U.K. Financial Services Authority (FSA) from September 2003 until September 2008 at the Mitsui USA Lunch-Time Forum held at the Zicklin School of Business, Baruch College/CUNY on December 8, 2010 about the financial crisis: what went wrong and what is needed to make it right. He frames his remarks with the following introduction: I want to address the question that the Queen famously asked at the London School of Economics of an assembly of economist there: why did none of you see this …
A Richer And More Diverse Future For Cell Biology, Sandra L. Schmid, Molly Carnes, Ursula Goodenough, Nancy Hopkins, Phoebe Leboy, Sandra Masur, Virginia Valian
A Richer And More Diverse Future For Cell Biology, Sandra L. Schmid, Molly Carnes, Ursula Goodenough, Nancy Hopkins, Phoebe Leboy, Sandra Masur, Virginia Valian
Publications and Research
No abstract provided.
The Mycobacterium Tuberculosis Drugome And Its Polypharmacological Implications, Sarah L. Kinnings, Li Xie, Kingston H. Fung, Richard M. Jackson, Lei Xie, Phillip E. Bourne
The Mycobacterium Tuberculosis Drugome And Its Polypharmacological Implications, Sarah L. Kinnings, Li Xie, Kingston H. Fung, Richard M. Jackson, Lei Xie, Phillip E. Bourne
Publications and Research
We report a computational approach that integrates structural bioinformatics, molecular modelling and systems biology to construct a drug-target network on a structural proteome-wide scale. The approach has been applied to the genome of Mycobacterium tuberculosis (M.tb), the causative agent of one of today’s most widely spread infectious diseases. The resulting drug-target interaction network for all structurally characterized approved drugs bound to putative M.tb receptors, we refer to as the ‘TB-drugome’. The TB-drugome reveals that approximately one-third of the drugs examined have the potential to be repositioned to treat tuberculosis and that many currently unexploited M.tb receptors may be chemically druggable …
Upper Cretaceous Peay Bentonites (North-Central Wyoming): Provenance And Tectonics Interpretation From Ash Composition, Nazrul I. Khandaker, Carl F. Vondra, Karl E. Seifert, Malek Shami, Rochelle Cardinale, Thakur Chaturgan
Upper Cretaceous Peay Bentonites (North-Central Wyoming): Provenance And Tectonics Interpretation From Ash Composition, Nazrul I. Khandaker, Carl F. Vondra, Karl E. Seifert, Malek Shami, Rochelle Cardinale, Thakur Chaturgan
Publications and Research
The Peay bentonites belong to the basal Frontier Formation (Bighorn Basin, north-central Wyoming), primarily outcrop in the Bighorn Basin, rest on an extensively bioturbated sandstone unit, the Peay Sandstone, and are generally the thinner bentonitic unit. Beds of very light gray to greenish gray bentonite are also abundant in the lower Frontier units between Kaycee and Mayoworth (Powder River Basin) and are very rarely as much as 3 m thick. Bentonite occurs within the interstratified shale, sandstone, and siltstone sequences of the lower Frontier unit throughout much of the southwestern Powder River Basin. The purpose of this study is to …
Tensorial Reconstruction At The Integrand Level, G. Heinrich, Giovanni Ossola, T. Reiter, F. Tramontano
Tensorial Reconstruction At The Integrand Level, G. Heinrich, Giovanni Ossola, T. Reiter, F. Tramontano
Publications and Research
We present a new approach to the reduction of one-loop amplitudes obtained by reconstructing the tensorial expression of the scattering amplitudes. The reconstruction is performed at the integrand level by means of a sampling in the integration momentum. There are several interesting applications of this novel method within existing techniques for the reduction of one-loop multi-leg amplitudes: to deal with numerically unstable points, such as in the vicinity of a vanishing Gram determinant; to allow for a sampling of the numerator function based on real values of the integration momentum; to optimize the numerical reduction in the case of long …