Horizons in Robinson-Trautman space-times
W. Natorf; J. Tafel
2008-07-18T23:59:59.000Z
The past quasi-local horizons in vacuum Robinson-Trautman spacetimes are described. The case of a null (non-expanding) horizon is discussed. It is shown that the only Robinson-Trautman space-time admitting such a horizon with sections diffeomorphic to S_2 is the Schwarzschild space-time. Weakening this condition leads to the horizons of the C-metric. Properties of the hypersurface r=2m for finite retarded time u are examined.
Effect of time horizon on incremental cost-effectiveness ratios
Sondhi, Manu
2005-01-01T23:59:59.000Z
Background: Estimation of cost-effectiveness of a therapy as compared with another, in healthcare, is often based on a single perspective and a single time horizon. In this thesis, I explored methods of extrapolating the ...
Time Horizons of Environmental vs. Non-Environmental Costs
Tovey, Craig A.
1 1 #12;Time Horizons of Environmental vs. Non-Environmental Costs: Evidence from U.S. Tort Fellowship #12;Abstract One explanation for a positive correlation between environmental and financial differences between environmental and other investment opportunities. One of these systematic differences
Dynamic Pricing Strategies under a Finite Time Horizon Joan Morris DiMicco
to scalpers. Cost has been perhaps the greatest factor precluding the widespread use of dynamic pricing goods, but in digital markets, the costs associated with making frequent, instantaneous price changesDynamic Pricing Strategies under a Finite Time Horizon Joan Morris DiMicco MIT Media Laboratory 20
The stability of Killing-Cauchy horizons in colliding plane wave space-times
J. B. Griffiths
2005-01-05T23:59:59.000Z
It is confirmed rigorously that the Killing-Cauchy horizons, which sometimes occur in space-times representing the collision and subsequent interaction of plane gravitational waves in a Minkowski background, are unstable with respect to bounded perturbations of the initial waves, at least for the case in which the initial waves have constant aligned polarizations.
Modeling exchange rate dependence dynamics at different time horizons
Embrechts, Paul
, Copula-GARCH, Conditional dependence, Dynamic copula Corresponding author. Tel.: +44(0) 247 657 4297. Financial time-series are often modeled with GARCH type models. In the multivariate GARCH literature there exist several models, like CCC- GARCH, DVEC, matrix-diagonal GARCH, BEKK and principal components GARCH
Egerstedt, Magnus
Trade-Offs Between Precision and Computation Horizon in Real-Time Optimal Control of Switched computational resources available in many real-time applications, questions concerning trade-offs between the computation horizon and the precision of the solution arise naturally. These trade-offs constitute the main
Multi-horizon solar radiation forecasting for Mediterranean locations using time series models
Voyant, Cyril; Muselli, Marc; Nivet, Marie Laure
2013-01-01T23:59:59.000Z
Considering the grid manager's point of view, needs in terms of prediction of intermittent energy like the photovoltaic resource can be distinguished according to the considered horizon: following days (d+1, d+2 and d+3), next day by hourly step (h+24), next hour (h+1) and next few minutes (m+5 e.g.). Through this work, we have identified methodologies using time series models for the prediction horizon of global radiation and photovoltaic power. What we present here is a comparison of different predictors developed and tested to propose a hierarchy. For horizons d+1 and h+1, without advanced ad hoc time series pre-processing (stationarity) we find it is not easy to differentiate between autoregressive moving average (ARMA) and multilayer perceptron (MLP). However we observed that using exogenous variables improves significantly the results for MLP . We have shown that the MLP were more adapted for horizons h+24 and m+5. In summary, our results are complementary and improve the existing prediction techniques ...
Larry G. Stolarczyk
2003-03-18T23:59:59.000Z
With the aid of a DOE grant (No. DE-FC26-01NT41050), Stolar Research Corporation (Stolar) developed the Horizon Sensor (HS) to distinguish between the different layers of a coal seam. Mounted on mining machine cutter drums, HS units can detect or sense the horizon between the coal seam and the roof and floor rock, providing the opportunity to accurately mine the section of the seam most desired. HS also enables accurate cutting of minimum height if that is the operator's objective. Often when cutting is done out-of-seam, the head-positioning function facilitates a fixed mining height to minimize dilution. With this technology, miners can still be at a remote location, yet cut only the clean coal, resulting in a much more efficient overall process. The objectives of this project were to demonstrate the feasibility of horizon sensing on mining machines and demonstrate that Horizon Sensing can allow coal to be cut cleaner and more efficiently. Stolar's primary goal was to develop the Horizon Sensor (HS) into an enabling technology for full or partial automation or ''agile mining''. This technical innovation (R&D 100 Award Winner) is quickly demonstrating improvements in productivity and miner safety at several prominent coal mines in the United States. In addition, the HS system can enable the cutting of cleaner coal. Stolar has driven the HS program on the philosophy that cutting cleaner coal means burning cleaner coal. The sensor, located inches from the cutting bits, is based upon the physics principles of a Resonant Microstrip Patch Antenna (RMPA). When it is in proximity of the rock-coal interface, the RMPA impedance varies depending on the thickness of uncut coal. The impedance is measured by the computer-controlled electronics and then sent by radio waves to the mining machine. The worker at the machine can read the data via a Graphical User Interface, displaying a color-coded image of the coal being cut, and direct the machine appropriately. The Horizon Sensor program began development in 1998 and experienced three major design phases. The final version, termed HS-3, was commissioned in 2000 with the assistance of the DOE-Mining Industry of the Future program, commercialized in 2002, and has been used 14 times in 12 different mines within the United States. The Horizon Sensor has applications in both underground and surface mining operations. This technology is primarily used in the coal industry, but is also used to mine trona and potash. All horizon sensor components have Mine Safety and Health Administration (MSHA) (United States) and IEC (International) certification. Horizon Sensing saves energy by maximizing cutting efficiency, cutting only desired material. This desired material is cleaner fuel, therefore reducing pollutants to the atmosphere when burned and burning more efficiently. Extracting only desired material increases productivity by reducing or eliminating the cleaning step after extraction. Additionally, this technology allows for deeper mining, resulting in more material gained from one location. The remote sensing tool allows workers to operate the machinery away from the hazards of cutting coal, including noise, breathing dust and gases, and coal and rock splintering and outbursts. The HS program has primarily revolved around the development of the technology. However, the end goal of the program has always been the commercialization of the technology and only within the last 2 years of the program has this goal been realized. Real-time horizon sensing on mining machines is becoming an industry tool. Detailed monitoring of system function, user experience, and mining benefits is ongoing.
Time Machines with Non-compactly Generated Cauchy Horizons and ``Handy Singularities"
S. V. Krasnikov
1997-11-12T23:59:59.000Z
The use of "handy singularities" (i.e. singularities similar to those arising in the Deutch-Politzer space) enables one to avoid (almost) all known difficulties inherent usually to creation of time machines. A simple method is discussed for constructing a variety of such singularities. A few 3-dimensional examples are cited.
Analysis of Unconstrained Nonlinear MPC Schemes with Time Varying Control Horizon
Knobloch,JÃ¼rgen
) has become a well-established method for optimal control of linear and nonlinear systems, see, e state, a finite horizon optimal control problem is solved and the first element (or sometimes also more) of the resulting optimal control sequence is used as input for the next sampling interval(s). This procedure
Mechanics of Isolated Horizons
Abhay Ashtekar; Christopher Beetle; Stephen Fairhurst
1999-11-04T23:59:59.000Z
A set of boundary conditions defining an undistorted, non-rotating isolated horizon are specified in general relativity. A space-time representing a black hole which is itself in equilibrium but whose exterior contains radiation admits such a horizon. However, the definition is applicable in a more general context, such as cosmological horizons. Physically motivated, (quasi-)local definitions of the mass and surface gravity of an isolated horizon are introduced and their properties analyzed. Although their definitions do not refer to infinity, these quantities assume their standard values in the static black hole solutions. Finally, using these definitions, the zeroth and first laws of black hole mechanics are established for isolated horizons.
A study of different horizons in inhomogeneous LTB cosmological model
Subenoy Chakraborty; Subhajit Saha
2015-03-04T23:59:59.000Z
This work deals with a detailed study of the dynamics of the apparent, event and particle horizons in the background of the inhomogeneous LTB spacetime. The comparative study among these horizons shows a distinct character for apparent horizon compared to the other horizons. The apparent horizon will be a trapping horizon if its acceleration is positive. The Kodama vector is also defined and its causal character is found to be similar to that in the FRW model.
Pazzani, Michael J.
An Indexing Scheme for Fast Similarity Search in Large Time Series Databases Eamonn J. Keogh, California 92697 USA {eamonn,pazzani}@ics.uci.edu Abstract We address the problem of similarity search similar element of the bin. This bound allows us to search the bins in best first order, and to prune some
Mechanics of Rotating Isolated Horizons
Abhay Ashtekar; Christopher Beetle; Jerzy Lewandowski
2001-04-11T23:59:59.000Z
Black hole mechanics was recently extended by replacing the more commonly used event horizons in stationary space-times with isolated horizons in more general space-times (which may admit radiation arbitrarily close to black holes). However, so far the detailed analysis has been restricted to non-rotating black holes (although it incorporated arbitrary distortion, as well as electromagnetic, Yang-Mills and dilatonic charges). We now fill this gap by first introducing the notion of isolated horizon angular momentum and then extending the first law to the rotating case.
Acoustic horizons in nuclear fluids
Niladri Sarkar; Abhik Basu; Jayanta K. Bhattacharjee; Arnab K. Ray
2014-04-13T23:59:59.000Z
We consider a hydrodynamic description of the spherically symmetric outward flow of nuclear matter, accommodating dispersion in it as a very weak effect. About the resulting stationary conditions in the flow, we apply an Eulerian scheme to derive a fully nonlinear equation of a time-dependent radial perturbation. In its linearized limit, with no dispersion, this equation implies the static acoustic horizon of an analogue gravity model. We, however, show that time-dependent nonlinear effects destabilize the static horizon. We also model the perturbation as a high-frequency travelling wave, and perform a {\\it WKB} analysis, in which the effect of weak dispersion is studied iteratively. We show that even arbitrarily small values of dispersion make the horizon fully opaque to any acoustic disturbance propagating against the bulk flow, with the amplitude and the energy flux of the radial perturbation undergoing a discontinuity at the horizon, and decaying exponentially just outside it.
Horizon dynamics of distorted rotating black holes
Tony Chu; Harald P. Pfeiffer; Michael I. Cohen
2011-04-28T23:59:59.000Z
We present numerical simulations of a Kerr black hole perturbed by a pulse of ingoing gravitational radiation. For strong perturbations we find up to five concentric marginally outer trapped surfaces. These trapped surfaces appear and disappear in pairs, so that the total number of such surfaces at any given time is odd. The world tubes traced out by the marginally outer trapped surfaces are found to be spacelike during the highly dynamical regime, approaching a null hypersurface at early and late times. We analyze the structure of these marginally trapped tubes in the context of the dynamical horizon formalism, computing the expansion of outgoing and incoming null geodesics, as well as evaluating the dynamical horizon flux law and the angular momentum flux law. Finally, we compute the event horizon. The event horizon is well-behaved and approaches the apparent horizon before and after the highly dynamical regime. No new generators enter the event horizon during the simulation.
Scanning the Conservation Horizon
Scanning the Conservation Horizon A Guide to Climate Change Vulnerability Assessment #12;Scanning.A. Stein, and N.A. Edelson, editors. 2011. Scanning the Conservation Horizon: A Guide to Climate Change.S. Geological Survey Fundamental Science Practices. Scanning the Conservation Horizon is available online at
Yates, Andrew
/09) HorizonCareLinkSM All the help you need online Horizon Health EAP also provides services through counselors- Child care or elder care services- Pet care and veterinarians- Adoption resources- Health clubsHorizon Health EAP Services Employee Assistance Program with Telephone and 3 Face
Silhouette Area Based Similarity Measure for Template Matching in Constant Time
Daniel Mohr; Gabriel Zachmann
Abstract. In this paper, we present a novel, fast, resolution-independent silhouette area-based matching approach. We approximate the silhouette area by a small set of axis-aligned rectangles. This yields a very memory efficient representation of templates. In addition, utilizing the integral image, we can thus compare a silhouette with an input image at an arbitrary position in constant time. Furthermore, we present a new method to build a template hierarchy optimized for our rectangular representation of template silhouettes. With the template hierarchy, the complexity of our matching method for n templates is O(log n). For example, we can match a hierarchy consisting of 1000 templates in 1.5ms. Overall, our contribution constitutes an important piece in the initialization stage of any tracker of (articulated) objects. Key words: pose estimation, tracking, template matching, rectangle packing problem 1
Deepwater Horizon Situation Report #5
none,
2010-06-10T23:59:59.000Z
At approximately 11:00 pm EDT April 20, 2010 an explosion occurred aboard the Deepwater Horizon mobile offshore drilling unit (MODU) located 52 miles Southeast of Venice, LA and 130 miles southeast of New Orleans, LA. The MODU was drilling an exploratory well and was not producing oil at the time of the incident. The Deepwater Horizon MODU sank 1,500 feet northwest of the well site. Detailed information on response and recovery operations can be found at: http://www.deepwaterhorizonresponse.com/go/site/2931/
Fountain, Glen H; Hersman, Christopher B; Herder, Timothy S; Coughlin, Thomas B; Gibson, William C; Clancy, Deborah A; DeBoy, Christopher C; Hill, T Adrian; Kinnison, James D; Mehoke, Douglas S; Ottman, Geffrey K; Rogers, Gabe D; Stern, S Alan; Stratton, James M; Vernon, Steven R; Williams, Stephen P
2007-01-01T23:59:59.000Z
The New Horizons spacecraft was launched on 19 January 2006. The spacecraft was designed to provide a platform for seven instruments that will collect and return data from Pluto in 2015. The design drew on heritage from previous missions developed at The Johns Hopkins University Applied Physics Laboratory (APL) and other missions such as Ulysses. The trajectory design imposed constraints on mass and structural strength to meet the high launch acceleration needed to reach the Pluto system prior to the year 2020. The spacecraft subsystems were designed to meet tight mass and power allocations, yet provide the necessary control and data handling finesse to support data collection and return when the one-way light time during the Pluto flyby is 4.5 hours. Missions to the outer solar system require a radioisotope thermoelectric generator (RTG) to supply electrical power, and a single RTG is used by New Horizons. To accommodate this constraint, the spacecraft electronics were designed to operate on less than 200 W....
Glen H. Fountain; David Y. Kusnierkiewicz; Christopher B. Hersman; Timothy S. Herder; Thomas B. Coughlin; William C. Gibson; Deborah A. Clancy; Christopher C. DeBoy; T. Adrian Hill; James D. Kinnison; Douglas S. Mehoke; Geffrey K. Ottman; Gabe D. Rogers; S. Alan Stern; James M. Stratton; Steven R. Vernon; Stephen P. Williams
2007-09-26T23:59:59.000Z
The New Horizons spacecraft was launched on 19 January 2006. The spacecraft was designed to provide a platform for seven instruments that will collect and return data from Pluto in 2015. The design drew on heritage from previous missions developed at The Johns Hopkins University Applied Physics Laboratory (APL) and other missions such as Ulysses. The trajectory design imposed constraints on mass and structural strength to meet the high launch acceleration needed to reach the Pluto system prior to the year 2020. The spacecraft subsystems were designed to meet tight mass and power allocations, yet provide the necessary control and data handling finesse to support data collection and return when the one-way light time during the Pluto flyby is 4.5 hours. Missions to the outer solar system require a radioisotope thermoelectric generator (RTG) to supply electrical power, and a single RTG is used by New Horizons. To accommodate this constraint, the spacecraft electronics were designed to operate on less than 200 W. The spacecraft system architecture provides sufficient redundancy to provide a probability of mission success of greater than 0.85, even with a mission duration of over 10 years. The spacecraft is now on its way to Pluto, with an arrival date of 14 July 2015. Initial inflight tests have verified that the spacecraft will meet the design requirements.
Apparent Horizons in Vacuum Robinson-Trautman Spacetimes
E. W. M. Chow; A. W. -C. Lun
1995-04-01T23:59:59.000Z
Vacuum asymptotically flat Robinson-Trautman spacetimes are a well known class of spacetimes exhibiting outgoing gravitational radiation. In this paper we describe a method of locating the past apparent horizon in these spacetimes, and discuss the properties of the horizon. We show that the past apparent horizon is non-timelike, and that its surface area is a decreasing function of the retarded time. A numerical simulation of the apparent horizon is also discussed.
Black Hole Initial Data with a Horizon of Prescribed Geometry
Brian Smith
2007-10-04T23:59:59.000Z
The purpose of this work is to construct asymptotically flat, time symmetric initial data with an apparent horizon of prescribed intrinsic geometry. To do this, we use the parabolic partial differential equation for prescribing scalar curvature. In this equation the horizon geometry is contained within the freely specifiable part of the metric. This contrasts with the conformal method in which the geometry of the horizon can only be specified up to a conformal factor.
Online Horizon Selection in Receding Horizon Temporal Logic Planning
Murray, Richard M.
- ative, short horizon solutions, using the currently observed state to compute a control strategy synthesis for temporal logic, but have thus far been limited by pursuing a single sequence of short horizon problems to the current goal. We propose a receding horizon algorithm for reactive synthesis that au
Investors' horizon and stock prices
Parsa, Sahar
2011-01-01T23:59:59.000Z
This dissertation consists of three essays on the relation between investors' trading horizon and stock prices. The first chapter explores the theoretical relation between the horizon of traders and the negative externality ...
Isolated Horizons: A Generalization of Black Hole Mechanics
Abhay Ashtekar; Christopher Beetle; Stephen Fairhurst
1998-12-18T23:59:59.000Z
A set of boundary conditions defining a non-rotating isolated horizon are given in Einstein-Maxwell theory. A space-time representing a black hole which itself is in equilibrium but whose exterior contains radiation admits such a horizon . Physically motivated, (quasi-)local definitions of the mass and surface gravity of an isolated horizon are introduced. Although these definitions do not refer to infinity, the quantities assume their standard values in Reissner-Nordstrom solutions. Finally, using these definitions, the zeroth and first laws of black hole mechanics are established for isolated horizons.
Spacetimes containing slowly evolving horizons
W. Kavanagh; I. Booth
2006-08-29T23:59:59.000Z
Slowly evolving horizons are trapping horizons that are "almost" isolated horizons. This paper reviews their definition and discusses several spacetimes containing such structures. These include certain Vaidya and Tolman-Bondi solutions as well as (perturbatively) tidally distorted black holes. Taking into account the associated mass scales, they also suggest that slowly evolving horizons are the norm rather than the exception in astrophysical processes that involve stellar-scale black holes.
Can an evolving Universe host a static event horizon?
Aharon Davidson; Shimon Rubin; Yosef Verbin
2012-11-09T23:59:59.000Z
We prove the existence of general relativistic perfect fluid black hole solutions, and demonstrate the phenomenon for the $P=w\\rho$ class of equations of state. While admitting a local time-like Killing vector on the event horizon itself, the various black hole configurations are necessarily time dependent (thereby avoiding a well known no-go theorem) away from the horizon. Consistently, Hawking's imaginary time periodicity is globally manifest on the entire spacetime manifold.
Entropy of Isolated Horizons revisited
Rudranil Basu; Romesh K. Kaul; Parthasarathi Majumdar
2009-07-29T23:59:59.000Z
The decade-old formulation of the isolated horizon classically and within loop quantum gravity, and the extraction of the microcanonical entropy of such a horizon from this formulation, is reviewed, in view of recent renewed interest. There are two main approaches to this problem: one employs an SU(2) Chern-Simons theory describing the isolated horizon degrees of freedom, while the other uses a reduced U(1) Chern-Simons theory obtained from the SU(2) theory, with appropriate constraints imposed on the spectrum of boundary states `living' on the horizon. It is shown that both these ways lead to the same infinite series asymptotic in horizon area for the microcanonical entropy of an isolated horizon. The leading area term is followed by an unambiguous correction term logarithmic in area with a coefficient $-\\frac32$, with subleading corrections dropping off as inverse powers of the area.
Entropy of isolated horizons revisited
Basu, Rudranil; Kaul, Romesh K.; Majumdar, Parthasarathi [SN Bose National Centre for Basic Sciences, Kolkata 700 098 (India); Institute of Mathematical Sciences, Chennai 600 113 (India); Saha Institute of Nuclear Physics, Kolkata 700 064 (India)
2010-07-15T23:59:59.000Z
The decade-old formulation of the isolated horizon classically and within loop quantum gravity, and the extraction of the microcanonical entropy of such a horizon from this formulation, is reviewed, in view of recent renewed interest. There are two main approaches to this problem: one employs an SU(2) Chern-Simons theory describing the isolated horizon degrees of freedom, while the other uses a reduced U(1) Chern-Simons theory obtained from the SU(2) theory, with appropriate constraints imposed on the spectrum of boundary states ''living'' on the horizon. It is shown that both these ways lead to the same infinite series asymptotic in the horizon area for the microcanonical entropy of an isolated horizon. The leading area term is followed by an unambiguous correction term logarithmic in area with a coefficient -(3/2), with subleading corrections dropping off as inverse powers of the area.
Optical geometry across the horizon
Rickard Jonsson
2007-08-19T23:59:59.000Z
In a companion paper (Jonsson and Westman, Class. Quantum Grav. 23 (2006) 61), a generalization of optical geometry, assuming a non-shearing reference congruence, is discussed. Here we illustrate that this formalism can be applied to a finite four-volume of any spherically symmetric spacetime. In particular we apply the formalism, using a non-static reference congruence, to do optical geometry across the horizon of a static black hole. While the resulting geometry in principle is time dependent, we can choose the reference congruence in such a manner that an embedding of the geometry always looks the same. Relative to the embedded geometry the reference points are then moving. We discuss the motion of photons, inertial forces and gyroscope precession in this framework.
Thermodynamics of apparent horizon and modified Friedman equations
Ahmad Sheykhi
2010-12-02T23:59:59.000Z
Starting from the first law of thermodynamics, $dE=T_hdS_h+WdV$, at apparent horizon of a FRW universe, and assuming that the associated entropy with apparent horizon has a quantum corrected relation, $S=\\frac{A}{4G}-\\alpha \\ln \\frac{A}{4G}+\\beta \\frac{4G}{A}$, we derive modified Friedmann equations describing the dynamics of the universe with any spatial curvature. We also examine the time evolution of the total entropy including the quantum corrected entropy associated with the apparent horizon together with the matter field entropy inside the apparent horizon. Our study shows that, with the local equilibrium assumption, the generalized second law of thermodynamics is fulfilled in a region enclosed by the apparent horizon.
Near Horizon Structure of Extremal Vanishing Horizon Black Holes
Sadeghian, S; Vahidinia, M H; Yavartanoo, H
2015-01-01T23:59:59.000Z
We study the near horizon structure of Extremal Vanishing Horizon (EVH) black holes, extremal black holes with vanishing horizon area with a vanishing one-cycle on the horizon. We construct the most general near horizon EVH and near-EVH ansatz for the metric and other fields, like dilaton and gauge fields which may be present in the theory. We prove that (1) the near horizon EVH geometry for generic gravity theory in generic dimension has a three dimensional maximally symmetric subspace; (2) if the matter fields of the theory satisfy strong energy condition either this 3d part is AdS$_3$, or the solution is a direct product of a locally 3d flat space and a $d-3$ dimensional part; (3) these results extend to the near horizon geometry of near-EVH black holes, for which the AdS$_3$ part is replaced with BTZ geometry. We present some specific near horizon EVH geometries in 3, 4 and 5 dimensions for which there is a classification. We also briefly discuss implications of these generic results for generic (gauged) ...
Pedagogical notes on black holes, de Sitter space, and bifurcated horizons
Tom Banks
2010-07-22T23:59:59.000Z
I discuss black hole evaporation in two different coordinate systems and argue that the results of the two are compatible once one takes the holographic principle into account. de Sitter space is then discussed along similar lines. Finally I make some remarks about smooth initial conditions in GR, which evolve to space-times with bifurcate horizons, and emphasize the care one must take in identifying spaces of solutions of General Relativity which belong to the same quantum theory of gravity. No really new material is presented, but the point of view I take on all 3 subjects is not widely appreciated.
Offset-free Receding Horizon Control of Constrained Linear Systems subject to
Cambridge, University of
Offset-free Receding Horizon Control of Constrained Linear Systems subject to Time/F-INFENG/TR.468 November 4, 2003 #12;Offset-free Receding Horizon Control of Constrained Linear Systems subject and offset-free control of con- strained, linear time-invariant systems in the presence of time
Falling through the black hole horizon
Brustein, Ram
2015-01-01T23:59:59.000Z
We consider the fate of a small classical object, a "stick", as it falls through the horizon of a large black hole (BH). Classically, the equivalence principle dictates that the stick is affected by small tidal forces, and Hawking's quantum-mechanical model of BH evaporation makes essentially the same prediction. If, on the other hand, the BH horizon is surrounded by a "firewall", the stick will be consumed as it falls through. We have recently extended Hawking's model by taking into account the quantum fluctuations of the geometry and the classical back-reaction of the emitted particles. Here, we calculate the strain exerted on the falling stick for our model. The strain depends on the near-horizon state of the Hawking pairs. We find that, after the Page time when the state of the pairs deviates significantly from maximal entanglement (as required by unitarity), the induced strain in our semiclassical model is still parametrically small. This is because the number of the disentangled pairs is parametrically ...
Dual-Sampling-Rate Moving Horizon Control of a Class of Linear Systems with Input Saturation and
Dual-Sampling-Rate Moving Horizon Control of a Class of Linear Systems with Input Saturation horizon control scheme for a class of linear, continuous-time plants with strict input saturation horizon control, robust, fast sampling, stability, linear sys- tems, input constraints 1 Introduction
Iteratively extending time horizon reinforcement learning
Wehenkel, Louis
- Belgium y Research Fellow FNRS, #3; Postdoctoral Researcher FNRS Abstract. Reinforcement learning aims
Generic isolated horizons in loop quantum gravity
Christopher Beetle; Jonathan Engle
2010-07-16T23:59:59.000Z
Isolated horizons model equilibrium states of classical black holes. A detailed quantization, starting from a classical phase space restricted to spherically symmetric horizons, exists in the literature and has since been extended to axisymmetry. This paper extends the quantum theory to horizons of arbitrary shape. Surprisingly, the Hilbert space obtained by quantizing the full phase space of \\textit{all} generic horizons with a fixed area is identical to that originally found in spherical symmetry. The entropy of a large horizon remains one quarter its area, with the Barbero-Immirzi parameter retaining its value from symmetric analyses. These results suggest a reinterpretation of the intrinsic quantum geometry of the horizon surface.
Black hole initial data with a horizon of prescribed intrinsic and extrinsic geometry
Brian Smith
2010-06-14T23:59:59.000Z
The purpose of this work is to construct asymptotically flat, time symmetric initial data with an apparent horizon of prescribed intrinsic and extrinsic geometry. To do this, we use the parabolic partial differential equation for prescribing scalar curvature. In this equation the horizon geometry is contained within the freely specifiable part of the metric. This contrasts with the conformal method in which the geometry of the horizon can only be specified up to a conformal factor.
Inflationary Axion Cosmology Beyond Our Horizon
David B. Kaplan; Ann E. Nelson
2008-09-07T23:59:59.000Z
In theories of axion dark matter with large axion decay constant, temperature variations in the CMB are extremely sensitive to perturbations in the initial axion field, allowing one to place a lower bound on the total amount of inflation. The most stringent bound comes from axion strings, which for axion decay constant f=10^17 GeV would currently be observable at a distance of 6 x 10^16 light-years, nearly ten million times as far away as our horizon.
Brian Cox
2010-09-01T23:59:59.000Z
The National Ignition Facility, the world's largest laser system, located at Lawrence Livermore National Laboratory, was featured in the BBC broadcast "Horizon" hosted by physicist Brian Cox. Here is the NIF portion of the program, which was entitled "Can We Make A Star On Earth?" This video is used with the express permission of the BBC.
Directly observing entropy accumulate on the horizon and holography
Ariel Edery; Hugues Beauchesne
2012-05-15T23:59:59.000Z
Recent numerical simulations of gravitational collapse show that there exists a special foliation of the spacetime where matter and entropy accumulate directly on the inside of the horizon surface. In this foliation, the time coincides with the proper time of the asymptotic static observer (ASO) and for spherical symmetry, this corresponds to isotropic coordinates. In this gauge, the three-volume in the interior shrinks to zero and only the horizon area remains at the end of collapse. In a different foliation, matter and entropy accumulate in the volume. The entropy is however independent of the foliation. Black hole holography is therefore a mapping from an arbitrary foliation, where information resides in the volume, to the special ASO frame, where it resides directly on the horizon surface.
Local symmetries of non-expanding horizons
Rudranil Basu; Ayan Chatterjee; Amit Ghosh
2010-04-21T23:59:59.000Z
Local symmetries of a non-expanding horizon has been investigated in the 1st order formulation of gravity. When applied to a spherically symmetric isolated horizon only a U(1) subgroup of the Lorentz group survives as residual local symmetry that one can make use of in constructing an effective theory on the horizon.
Spacetime Foam Model of the Schwarzschild Horizon
Jarmo Makela; Ari Peltola
2004-03-19T23:59:59.000Z
We consider a spacetime foam model of the Schwarzschild horizon, where the horizon consists of Planck size black holes. According to our model the entropy of the Schwarzschild black hole is proportional to the area of its event horizon. It is possible to express geometrical arguments to the effect that the constant of proportionality is, in natural units, equal to one quarter.
Deepwater Horizon Disaster Professor Satish Nagarajaiah
Nagarajaiah, Satish
Systems Research @ Rice Source: MMS and BP #12;April 20, 2010 At approximately 10 pm Horizon Rig disaster;Collapse / Oil Spill Offshore and Marine Systems Research @ Rice Source: NYT/AP/flickr #12;Horizon BeforeDeepwater Horizon Disaster Professor Satish Nagarajaiah Dept. of Civil & Env. Eng. , Dept
Horizons cannot save the Landscape
Iosif Bena; Alex Buchel; Oscar J. C. Dias
2012-12-20T23:59:59.000Z
Solutions with anti-D3 branes in a Klebanov-Strassler geometry with positive charge dissolved in fluxes have a certain singularity corresponding to a diverging energy density of the RR and NS-NS three-form fluxes. There are many hopes and arguments for and against this singularity, and we attempt to settle the issue by examining whether this singularity can be cloaked by a regular event horizon. This is equivalent to the existence of asymptotically Klebanov-Tseytlin or Klebanov-Strassler black holes whose charge measured at the horizon has the opposite sign to the asymptotic charge. We find that no such KT solution exists. Furthermore, for a large class of KS black holes we considered, the charge at the horizon must also have the same sign as the asymptotic charge, and is completely determined by the temperature, the number of fractional branes and the gaugino masses of the dual gauge theory. Our result suggests that antibrane singularities in backgrounds with charge in the fluxes are unphysical, which in turn raises the question as to whether antibranes can be used to uplift AdS vacua to deSitter ones. Our results also point out to a possible instability mechanism for the antibranes.
Spacetime near isolated and dynamical trapping horizons
Ivan Booth
2014-06-02T23:59:59.000Z
We study the near-horizon spacetime for isolated and dynamical trapping horizons (equivalently marginally outer trapped tubes). The metric is expanded relative to an ingoing Gaussian null coordinate and the terms of that expansion are explicitly calculated to second order. For the spacelike case, knowledge of the intrinsic and extrinsic geometry of the (dynamical) horizon is sufficient to determine the near-horizon spacetime, while for the null case (an isolated horizon) more information is needed. In both cases spacetime is allowed to be of arbitrary dimension and the formalism accomodates both general relativity as well as more general field equations. The formalism is demonstrated for two applications. First, spacetime is considered near an isolated horizon and the construction is both checked against the Kerr-Newman solution and compared to the well-known near-horizon limit for stationary extremal black hole spacetimes. Second, spacetime is examined in the vicinity of a slowly evolving horizon and it is demonstrated that there is always an event horizon candidate in this region. The geometry and other properties of this null surface match those of the slowly evolving horizon to leading order and in this approximation the candidate evolves in a locally determined way. This generalizes known results for Vaidya as well as certain spacetimes known from studies of the fluid-gravity correspondence.
Variable horizon in a peridynamic medium.
Silling, Stewart A.; Littlewood, David John; Seleson, Pablo
2014-10-01T23:59:59.000Z
A notion of material homogeneity is proposed for peridynamic bodies with vari- able horizon but constant bulk properties. A relation is derived that scales the force state according to the position-dependent horizon while keeping the bulk properties un- changed. Using this scaling relation, if the horizon depends on position, artifacts called ghost forces may arise in a body under homogeneous deformation. These artifacts de- pend on the second derivative of horizon and can be reduced by use of a modified equilibrium equation using a new quantity called the partial stress . Bodies with piece- wise constant horizon can be modeled without ghost forces by using a technique called a splice between the regions. As a limiting case of zero horizon, both partial stress and splice techniques can be used to achieve local-nonlocal coupling. Computational examples, including dynamic fracture in a one-dimensional model with local-nonlocal coupling, illustrate the methods.
Apparent horizon in fluid-gravity duality
Booth, Ivan; Heller, Michal P.; Plewa, Grzegorz; Spalinski, Michal [Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, A1C 5S7 (Canada); Instituut voor Theoretische Fysica, Universiteit van Amsterdam, Science Park 904, 1090 GL Amsterdam (Netherlands); Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw (Poland); Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw (Poland) and Physics Department, University of Bialystok, 15-424 Bialystok (Poland)
2011-05-15T23:59:59.000Z
This article develops a computational framework for determining the location of boundary-covariant apparent horizons in the geometry of conformal fluid-gravity duality in arbitrary dimensions. In particular, it is shown up to second order and conjectured to hold to all orders in the gradient expansion that there is a unique apparent horizon which is covariantly expressible in terms of fluid velocity, temperature, and boundary metric. This leads to the first explicit example of an entropy current defined by an apparent horizon and opens the possibility that in the near-equilibrium regime there is preferred foliation of apparent horizons for black holes in asymptotically anti-de Sitter spacetimes.
British Petroleum's Deepwater Horizon Accident and the Thinking, Engaged Workforce - 13265
Rigot, William L. [Fluor Corporation, Technical Support Services (United States)] [Fluor Corporation, Technical Support Services (United States)
2013-07-01T23:59:59.000Z
On April 20, 2010, hydrocarbons escaped from the Macondo well into Transocean's Deepwater Horizon, resulting in fire and multiple explosions. 11 people on the rig died. The billion dollar Deepwater Horizon sank. 4.9 M gallons of product flowed from the well for 87 days creating an environmental nightmare for communities bordering on the Gulf of Mexico. BP established a $20 B reserve to pay for damages. Investigations and legal culpability continue to this day. In September 2010, the Institute for Nuclear Power Operators (INPO) issued Significant Operating Experience Report (SOER) 10-2, Engaged, Thinking Organizations. The industry had experienced 11 events, 9 in US commercial nuclear utilities, and 2 international, that had disturbing trends. The underlying causes highlighted by INPO were inadequate recognition of risk, weaknesses in application of significant operating experience, tolerance of equipment and personnel problems, and a significant drift in standards. While the noted INPO problems and the Deepwater Horizon event appear to have nothing in common, they do exhibit similarities in a drift away from expected behavior on the part of front line workers and their supervisors. At the same time, hidden hazards are accumulating in the environment leading to error intolerant conditions. Without a good understanding of this concept, many organizations tend to focus on the person who 'touched it last', while missing the deeper organizational factors that led that individual to think that what they were doing was correct. An understanding of this failure model is important in reconstruction of events and crafting effective corrective actions. It is much more important, however, for leaders in high hazard industries to recognize when they are approaching error intolerant conditions and take steps immediately to add safety margin. (authors)
Pouria Dadras; J. T. Firouzjaee; Reza Mansouri
2012-11-12T23:59:59.000Z
We propose a special solution of Einstein equations in the general Vaidya form representing a dynamical black hole having horizon cross-sections with toroidal topology. The concrete model enables us to study for the first time dynamical horizons with toroidal topology, its area law, and the question of matter flux inside the horizon, without using a cut-and-paste technology to construct the solution.
Two physical characteristics of numerical apparent horizons
Ivan Booth
2007-12-20T23:59:59.000Z
This article translates some recent results on quasilocal horizons into the language of $(3+1)$ general relativity so as to make them more useful to numerical relativists. In particular quantities are described which characterize how quickly an apparent horizon is evolving and how close it is to either equilibrium or extremality.
Microsoft PowerPoint - Deepwater Horizon Containment - 30 JUN...
Broader source: Energy.gov (indexed) [DOE]
Deepwater Horizon Containment - 30 JUN.ppt Microsoft PowerPoint - Deepwater Horizon Containment - 30 JUN.ppt Microsoft PowerPoint - Deepwater Horizon Containment - 30 JUN.ppt More...
Deepwater Horizon Oil Spill; Draft Programmatic and Phase III Early
Deepwater Horizon Oil Spill; Draft Programmatic and Phase III Early Restoration Plan of the Deepwater Horizon oil spill. The restoration alternatives are comprised of early restoration project types Addressing Injuries Resulting from the Deepwater Horizon Oil Spill (Framework Agreement). Criteria
Green Investment Horizons: Effects of Policy on the Market for...
Horizons: Effects of Policy on the Market for Building Energy Efficiency Technologies Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Green Investment Horizons: Effects...
New Horizons Mission Powered by Space Radioisotope Power Systems...
New Horizons Mission Powered by Space Radioisotope Power Systems New Horizons Mission Powered by Space Radioisotope Power Systems January 30, 2008 - 6:47pm Addthis Artist's concept...
Horizon effects with surface waves on moving water
Germain Rousseaux; Philippe Maissa; Christian Mathis; Pierre Coullet; Thomas G. Philbin; Ulf Leonhardt
2010-10-01T23:59:59.000Z
Surface waves on a stationary flow of water are considered, in a linear model that includes the surface tension of the fluid. The resulting gravity-capillary waves experience a rich array of horizon effects when propagating against the flow. In some cases three horizons (points where the group velocity of the wave reverses) exist for waves with a single laboratory frequency. Some of these effects are familiar in fluid mechanics under the name of wave blocking, but other aspects, in particular waves with negative co-moving frequency and the Hawking effect, were overlooked until surface waves were investigated as examples of analogue gravity [Sch\\"utzhold R and Unruh W G 2002 Phys. Rev. D 66 044019]. A comprehensive presentation of the various horizon effects for gravity-capillary waves is given, with emphasis on the deep water/short wavelength case kh>>1 where many analytical results can be derived. A similarity of the state space of the waves to that of a thermodynamic system is pointed out.
DualÂSamplingÂRate Moving Horizon Control of a Class of Linear Systems with Input SaturationÂsamplingÂrate moving horizon control scheme for a class of linear, continuousÂtime plants with strict input saturation, it is not computed by a simple linear feedback law, but as a solution of an optimal control problem. As a result
Locating Boosted Kerr and Schwarzschild Apparent Horizons
Mijan F. Huq; Matthew W. Choptuik; Richard A. Matzner
2000-02-22T23:59:59.000Z
We describe a finite-difference method for locating apparent horizons and illustrate its capabilities on boosted Kerr and Schwarzschild black holes. Our model spacetime is given by the Kerr-Schild metric. We apply a Lorentz boost to this spacetime metric and then carry out a 3+1 decomposition. The result is a slicing of Kerr/Schwarzschild in which the black hole is propagated and Lorentz contracted. We show that our method can locate distorted apparent horizons efficiently and accurately.
Multi-horizon stochastic programming
2013-08-26T23:59:59.000Z
Aug 26, 2013 ... different time scales: while planning and building the infrastructure involves strate
Vacuum non-expanding horizons and shear-free null geodesic congruences
T. M. Adamo; E. T. Newman
2009-08-05T23:59:59.000Z
We investigate the geometry of a particular class of null surfaces in space-time called vacuum Non-Expanding Horizons (NEHs). Using the spin-coefficient equation, we provide a complete description of the horizon geometry, as well as fixing a canonical choice of null tetrad and coordinates on a NEH. By looking for particular classes of null geodesic congruences which live exterior to NEHs but have the special property that their shear vanishes at the intersection with the horizon, a good cut formalism for NEHs is developed which closely mirrors asymptotic theory. In particular, we show that such null geodesic congruences are generated by arbitrary choice of a complex world-line in a complex four dimensional space, each such choice induces a CR structure on the horizon, and a particular world-line (and hence CR structure) may be chosen by transforming to a privileged tetrad frame.
Zager, Laura (Laura A.)
2005-01-01T23:59:59.000Z
Measures of graph similarity have a broad array of applications, including comparing chemical structures, navigating complex networks like the World Wide Web, and more recently, analyzing different kinds of biological data. ...
Thermodynamics of Evolving Lorentzian Wormholes at Apparent Horizon in $f(R)$ Theory of Gravity
H. Saiedi
2014-09-08T23:59:59.000Z
In the context of modified $f(R)$ gravity, we attempt to study the thermodynamic properties of the evolving Lorentzian wormholes at the apparent horizon. It is shown that the wormhole can be derived from a particular $f(R)$ model in the radiation background. Moreover, it has been shown that the field equations can be cast to a similar form $dE = TdS + WdV + Td\\bar{S}$ at the apparent horizon for the evolving Lorentzian wormhole. Compared to the case of Einstein's general relativity, an additional term $Td\\bar{S}$ appears here.
Tunneling into black hole, escape from black hole, reflection from horizon and pair creation
V. V. Flambaum
2004-08-05T23:59:59.000Z
Within classical general relativity, a particle cannot reach the horizon of a black hole during a finite time, in the reference frame of an external observer; a particle inside cannot escape from a black hole; and the horizon does not produce any reflection. We argue that these processes may possibly be allowed in the quantum world. It is known that quantum mechanics allows pair creation at the horizon (one particle inside, another particle outside) and Hawking radiation. One can extend this idea to propose other processes. Tunneling of an external particle inside black hole may be produced by the creation of a pair at the horizon, followed by the annihilation of one created particle with the initial particle outside, with the other created particle appearing inside. Escape of a particle from a black hole may result from the creation of a pair, followed by the annihilation of one created particle with the particle inside, with the other created particle appearing outside. The escape may allow the transfer of information to the outside.Finally, the reflection of an external particle from the horizon may be modelled by a combination of the two processes presented above. The relationship between these "pair creation-annihilation'' mechanisms and the "horizon tunneling" calculations [1-5] is discussed.
Revisiting Gribov's Copies Inside The Horizon
R. R. Landim; V. E. R. Lemes; O. S. Ventura; L. C. Q. Vilar
2014-12-08T23:59:59.000Z
In this work, we recover the problem of legitimate topologically trivial Gribov copies inside the Gribov horizon. We avoid the reducibility problem which hampered the standard construction of van Baal, and then we are able to build a valid example with spherical symmetry. We also apply the same technique in the presence of a background of a Polyakov instanton in a Euclidian 3D spacetime, in order to study the effect of a non trivial environment in the generation of multiple copies inside the horizon.
Horizon Wind Energy | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are8COaBulkTransmissionSitingProcess.pdfGetecGtel Jump to:Pennsylvania: EnergyHopkinsville, Kentucky:HorizonHorizon
Optimal investment on finite horizon with random discrete order flow in illiquid markets
Paris-Sud XI, Université de
both on trading and observation of the assets. For example, in power markets, trading occurs through at any time but trading occurs more frequently near a terminal horizon. The investor can observe and trade the risky asset only at exogenous random times corresponding to the order flow given
Implementing an apparent-horizon finder in three dimensions
Thomas W. Baumgarte; Gregory B. Cook; Mark A. Scheel; Stuart L. Shapiro; Saul A. Teukolsky
1996-06-06T23:59:59.000Z
Locating apparent horizons is not only important for a complete understanding of numerically generated spacetimes, but it may also be a crucial component of the technique for evolving black-hole spacetimes accurately. A scheme proposed by Libson et al., based on expanding the location of the apparent horizon in terms of symmetric trace-free tensors, seems very promising for use with three-dimensional numerical data sets. In this paper, we generalize this scheme and perform a number of code tests to fully calibrate its behavior in black-hole spacetimes similar to those we expect to encounter in solving the binary black-hole coalescence problem. An important aspect of the generalization is that we can compute the symmetric trace-free tensor expansion to any order. This enables us to determine how far we must carry the expansion to achieve results of a desired accuracy. To accomplish this generalization, we describe a new and very convenient set of recurrence relations which apply to symmetric trace-free tensors.
Crawford, T. Daniel
.S. Department of Energy SunShot Initiative calls for an aggressive reduction in the overall systems costs by 75 year for solar with the U.S. surpassing the 10 GW milestone. While the initial cost reductionswww.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Towards Ubiquitous Cost- competitive Solar Power
Crawford, T. Daniel
) but will largely ignore the false alarms about genetically modified foods ("frankenfoods"), thimerosal in vaccineswww.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Nanotechnology and Food Safety "Pigs oink, dogsYoung, is likely very prescient when it comes to the subject of nanotechnology and the food supply. Although FDA
Crawford, T. Daniel
,weareseeinganincreasinginvestmentinrenew- able energies, like wind and solar. The development of new technologies leading to a clean energyKellerwasappointedtotheroleofAssociateLaboratoryDirectoratOakRidgeNationalLaboratory(ORNL), on July 1, 2009. On November 1, 2010, a new directorate was formed, Energy and Environmental Scienceswww.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES From Environmental Science to Next Generation
Cauchy horizon singularity without mass inflation
P. R. Brady; D. Nunez; S. Sinha
1992-11-20T23:59:59.000Z
A perturbed Reissner-Nordstr\\"om-de Sitter solution is used to emphasize the nature of the singularity along the Cauchy horizon of a charged spherically symmetric black hole. For these solutions, conditions may prevail under which the mass function is bounded and yet the curvature scalar $R_{\\alpha\\beta\\gamma\\delta} R^{\\alpha\\beta\\gamma\\delta}$ diverges.
Fiber-optical analogue of the event horizon: Appendices
Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt
2007-12-13T23:59:59.000Z
We explain the theory behind our fiber-optical analogue of the event horizon and present the experiment in detail.
Joint Information CenterJoint Information Center Deepwater Horizon Response
when they see the birds that have been impacted by the Deepwa- ter Horizon/BP oil spill. While and it is determined to be within the Deepwater Horizon Oil Spill Re- sponse area, a wildlife response team is notifiedJoint Information CenterJoint Information Center Deepwater Horizon Response Incident Command Post
Fiber-optical analogue of the event horizon
Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt
2008-02-13T23:59:59.000Z
The physics at the event horizon resembles the behavior of waves in moving media. Horizons are formed where the local speed of the medium exceeds the wave velocity. We use ultrashort pulses in microstructured optical fibers to demonstrate the formation of an artificial event horizon in optics. We observed a classical optical effect, the blue-shifting of light at a white-hole horizon. We also show by theoretical calculations that such a system is capable of probing the quantum effects of horizons, in particular Hawking radiation.
Overview of the New Horizons Science Payload
H. A. Weaver; W. C. Gibson; M. B. Tapley; L. A. Young; S. A. Stern
2007-09-26T23:59:59.000Z
The New Horizons mission was launched on 2006 January 19, and the spacecraft is heading for a flyby encounter with the Pluto system in the summer of 2015. The challenges associated with sending a spacecraft to Pluto in less than 10 years and performing an ambitious suite of scientific investigations at such large heliocentric distances (> 32 AU) are formidable and required the development of lightweight, low power, and highly sensitive instruments. This paper provides an overview of the New Horizons science payload, which is comprised of seven instruments. Alice provides spatially resolved ultraviolet spectroscopy. The Ralph instrument has two components: the Multicolor Visible Imaging Camera (MVIC), which performs panchromatic and color imaging, and the Linear Etalon Imaging Spectral Array (LEISA), which provides near-infrared spectroscopic mapping capabilities. The Radio Experiment (REX) is a component of the New Horizons telecommunications system that provides both occultation and radiometry capabilities. The Long Range Reconnaissance Imager (LORRI) provides high sensitivity, high spatial resolution optical imaging capabilities. The Solar Wind at Pluto (SWAP) instrument measures the density and speed of solar wind particles. The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) measures energetic protons and CNO ions. The Venetia Burney Student Dust Counter (VB-SDC) is used to record dust particle impacts during the cruise phases of the mission.
Avery E. Broderick; Ramesh Narayan; John Kormendy; Eric S. Perlman; Marcia J. Rieke; Sheperd S. Doeleman
2015-03-12T23:59:59.000Z
The 6 billion solar mass supermassive black hole at the center of the giant elliptical galaxy M87 powers a relativistic jet. Observations at millimeter wavelengths with the Event Horizon Telescope have localized the emission from the base of this jet to angular scales comparable to the putative black hole horizon. The jet might be powered directly by an accretion disk or by electromagnetic extraction of the rotational energy of the black hole. However, even the latter mechanism requires a confining thick accretion disk to maintain the required magnetic flux near the black hole. Therefore, regardless of the jet mechanism, the observed jet power in M87 implies a certain minimum mass accretion rate. If the central compact object in M87 were not a black hole but had a surface, this accretion would result in considerable thermal near-infrared and optical emission from the surface. Current flux limits on the nucleus of M87 strongly constrain any such surface emission. This rules out the presence of a surface and thereby provides indirect evidence for an event horizon.
Avery E. Broderick; Ramesh Narayan; John Kormendy; Eric S. Perlman; Marcia J. Rieke; Sheperd S. Doeleman
2015-04-05T23:59:59.000Z
The 6 billion solar mass supermassive black hole at the center of the giant elliptical galaxy M87 powers a relativistic jet. Observations at millimeter wavelengths with the Event Horizon Telescope have localized the emission from the base of this jet to angular scales comparable to the putative black hole horizon. The jet might be powered directly by an accretion disk or by electromagnetic extraction of the rotational energy of the black hole. However, even the latter mechanism requires a confining thick accretion disk to maintain the required magnetic flux near the black hole. Therefore, regardless of the jet mechanism, the observed jet power in M87 implies a certain minimum mass accretion rate. If the central compact object in M87 were not a black hole but had a surface, this accretion would result in considerable thermal near-infrared and optical emission from the surface. Current flux limits on the nucleus of M87 strongly constrain any such surface emission. This rules out the presence of a surface and thereby provides indirect evidence for an event horizon.
Condensation of an ideal gas with intermediate statistics on the horizon
Somayeh Zare; Zahra Raissi; Hosein Mohammadzadeh; Behrouz Mirza
2012-09-22T23:59:59.000Z
We consider a boson gas on the stretched horizon of the Schwartzschild and Kerr black holes. It is shown that the gas is in a Bose-Einstein condensed state with the Hawking temperature $T_c=T_H$ if the particle number of the system be equal to the number of quantum bits of space-time $ N \\simeq {A}/{{\\l_{p}}^{2}}$. Entropy of the gas is proportional to the area of the horizon $(A)$ by construction. For a more realistic model of quantum degrees of freedom on the horizon, we should presumably consider interacting bosons (gravitons). An ideal gas with intermediate statistics could be considered as an effective theory for interacting bosons. This analysis shows that we may obtain a correct entropy just by a suitable choice of parameter in the intermediate statistics.
Offset-free Receding Horizon Control of Constrained Linear Gabriele Pannocchia1 Eric C. Kerrigan2
Cambridge, University of
Offset-free Receding Horizon Control of Constrained Linear Systems Gabriele Pannocchia1 Eric C stability and offset-free control of constrained linear systems in the presence of time-varying setpoints-free controller and computing an appropriate domain of attraction for this controller. The linear (unconstrained
Navier-Stokes on Black Hole Horizons and DC Thermoelectric Conductivity
Aristomenis Donos; Jerome P. Gauntlett
2015-06-04T23:59:59.000Z
We consider a general class of black hole solutions of Einstein-Maxwell theory which are holographically dual to CFTs with spatially dependent sources. We show that an averaged DC thermoelectric conductivity matrix can be obtained by solving the forced, linearised, time-independent Navier-Stokes equations on the black hole horizon for an incompressible and charged fluid.
Navier-Stokes on Black Hole Horizons and DC Thermoelectric Conductivity
Donos, Aristomenis
2015-01-01T23:59:59.000Z
We consider a general class of black hole solutions of Einstein-Maxwell theory which are holographically dual to CFTs with spatially dependent sources. We show that an averaged DC thermoelectric conductivity matrix can be obtained by solving the forced, linearised, time-independent Navier-Stokes equations on the black hole horizon for an incompressible and charged fluid.
Thermoelectric DC conductivities from black hole horizons
Aristomenis Donos; Jerome P. Gauntlett
2014-10-14T23:59:59.000Z
An analytic expression for the DC electrical conductivity in terms of black hole horizon data was recently obtained for a class of holographic black holes exhibiting momentum dissipation. We generalise this result to obtain analogous expressions for the DC thermoelectric and thermal conductivities. We illustrate our results using some holographic Q-lattice black holes as well as for some black holes with linear massless axions, in both $D=4$ and $D=5$ bulk spacetime dimensions, which include both spatially isotropic and anisotropic examples. We show that some recently constructed ground states of holographic Q-lattices, which can be either electrically insulating or metallic, are all thermal insulators.
Turnpike sets in stochastic manufacturing systems with nite time horizon
manu- facturing systems. The main objective is to minimize an expected discounted cost of inventories a given #12;xed demand rate at the minimum cost of inventories and backlogs? A new car model example will increase. The objective is again to determine the production plans so as to minimize the total inventory
Rolling-Horizon Algorithm for Scheduling under Time-Dependent
Grossmann, Ignacio E.
of electricity · When and where to produce a certain grade? · How much to keep in storage? Meet product demands · Electricity pricing & availability · Due dates · Location of event points At demand points At some energy, USA #12;Introduction · Process operations are often subject to energy constraints Heating
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen
W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen
X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Bharadwaj, Nitin; Widener, Kevin
Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)
Physical process first law and caustic avoidance for Rindler horizon
Srijit Bhattacharjee; Sudipta Sarkar
2014-12-03T23:59:59.000Z
We study the perturbation induced by a slowly rotating massive object as it passes through a Rindler horizon. It is shown that the passage of this object can be approximately modeled as Delta\\,function type tidal distortions hitting the horizon. Further, following the analysis presented by Amsel, Marolf and Virmani related to the issue of the validity of physical process first law, we establish a condition on the size of the object so that this law holds for the Rindler horizon.
Review of “Deepwater Horizon Release Estimate of Rate by PIV”
Onishi, Yasuo
2010-06-01T23:59:59.000Z
The Plume Calculation Team (PCT) conducted high quality work within a very short period of time, in spite of needing to use less than ideal quality videos provided by British Petroleum (BP), especially those made before the cutoff of the riser above the Blow Out Preventer (BOP) on June 3, 2010. There are at least two valid approaches for estimating the oil discharge coming out from the Deepwater Horizon broken pipeline and its riser, using BP videotapes. One method is to estimate the exit velocity directly with the use of the Particle Image Velocimetry (PIV). The second method is to use a buoyant plume analysis to determine the exit velocity. The PCT used both of these methods.
Gribov's horizon and the ghost dressing function
Boucaud, Ph; Yaouanc, A Le; Micheli, J; Pène, O; Rodríguez-Quintero, J
2009-01-01T23:59:59.000Z
We study a relation recently derived by K. Kondo at zero momentum between the Zwanziger's horizon function, the ghost dressing function and Kugo's functions $u$ and $w$. We agree with this result as far as bare quantities are considered. However, assuming the validity of the horizon gap equation, we argue that the solution $w(0)=0$ is not acceptable since it would lead to a vanishing renormalised ghost dressing function. On the contrary, when the cut-off goes to infinity, $u(0) \\to \\infty$, $w(0) \\to -\\infty$ such that $u(0)+w(0) \\to -1$. Furthermore $w$ and $u$ are not multiplicatively renormalisable. Relaxing the gap equation allows $w(0)=0$ with $u(0) \\to -1$. In both cases the bare ghost dressing function, $F(0,\\Lambda)$, goes logarithmically to infinity at infinite cut-off. We show that, although the lattice results provide bare results not so different from the $F(0,\\Lambda)=3$ solution, this is an accident due to the fact that the lattice cut-offs lie in the range 1-3 GeV$^{-1}$. We show that the renor...
Narayan, Ramesh; Perlman, Eric S; Rieke, Marcia J; Doeleman, Sheperd S
2015-01-01T23:59:59.000Z
The 6 billion solar mass supermassive black hole at the center of the giant elliptical galaxy M87 powers a relativistic jet. Observations at millimeter wavelengths with the Event Horizon Telescope have localized the emission from the base of this jet to angular scales comparable to the putative black hole horizon. The jet might be powered directly by an accretion disk or by electromagnetic extraction of the rotational energy of the black hole. However, even the latter mechanism requires a confining thick accretion disk to maintain the required magnetic flux near the black hole. Therefore, regardless of the jet mechanism, the observed jet power in M87 implies a certain minimum mass accretion rate. If the central compact object in M87 were not a black hole but had a surface, this accretion would result in considerable thermal near-infrared and optical emission from the surface. Current flux limits on the nucleus of M87 strongly constrain any such surface emission. This rules out the presence of a surface and th...
Air-Shower Spectroscopy at horizons
D. Fargion
2005-11-20T23:59:59.000Z
Horizontal and Upward air-showers are suppressed by deep atmosphere opacity and by the Earth shadows. In such noise-free horizontal and upward directions rare Ultra High Cosmic rays and rarer neutrino induced air-showers may shine, mostly mediated by resonant PeVs interactions in air or by higher energy Tau Air-showers originated by neutrino tau skimming the Earth. At high altitude (mountains, planes, balloons) the air density is so rarefied that nearly all common air-showers might be observed at their maximal growth at a tuned altitude and directions. The arrival angle samples different distances and the corresponding most probable primary cosmic ray energy. The larger and larger distances (between observer and C.R. interaction) make wider and wider the shower area and it enlarge the probability to be observed (up to three order of magnitude more than vertical showers); the observation of a maximal electromagnetic shower development may amplify the signal by two-three order of magnitude (respect suppressed shower at sea level); the peculiar altitude-angle range may disentangle at best the primary cosmic ray energy and composition. Even from existing mountain observatory the up-going air-showers may trace, above the horizons, PeV-EeV high energy cosmic rays and, below the horizons, PeV-EeV neutrino astronomy: their early signals may be captured in already existing gamma telescopes as Magic at Canarie, while facing the Earth edges during (useless) cloudy nights.
Cool horizons lead to information loss
Borun D. Chowdhury
2013-07-29T23:59:59.000Z
There are two evidences for information loss during black hole evaporation: (i) a pure state evolves to a mixed state and (ii) the map from the initial state to final state is non-invertible. Any proposed resolution of the information paradox must address both these issues. The firewall argument focuses only on the first and this leads to order one deviations from the Unruh vacuum for maximally entangled black holes. The nature of the argument does not extend to black holes in pure states. It was shown by Avery, Puhm and the author that requiring the initial state to final state map to be invertible mandates structure at the horizon even for pure states. The proof works if black holes can be formed in generic states and in this paper we show that this is indeed the case. We also demonstrate how models proposed by Susskind, Papadodimas et al. and Maldacena et al. end up making the initial to final state map non-invertible and thus make the horizon "cool" at the cost of unitarity.
Learning task-specific similarity
Shakhnarovich, Gregory
2006-01-01T23:59:59.000Z
The right measure of similarity between examples is important in many areas of computer science. In particular it is a critical component in example-based learning methods. Similarity is commonly defined in terms of a ...
The Deepwater Horizon Disaster: What Happened and Why
Horne, Roland N. (Stanford University) [Stanford University
2011-01-05T23:59:59.000Z
The Deepwater Horizon disaster was the largest oil spill in US history, and the second largest spill in the world. 11 men lost their lives in the explosion and fire. Although the impacts of the spill were evident to large numbers of people, its causes were harder to see. This lecture will focus on the technical aspects of the events that led to the spill itself: what happened on the rig before, during and after the event, up to the time the rig sank. As with many engineering disasters, the accident was due to a sequence of failures, including both technical systems and procedural issues. Although the causes were complex and interacting, the lecture will focus on four main problems: (1) the failure of the cement and casing seal, (2) the failure to recognize and respond to hydrocarbon flow into the riser, (3) the ignition of hydrocarbons on the rig, and (4) the failure of the blow-out preventer (BOP) to seal the well. The lecture will conclude with some suggestions as to how events such as the Deepwater Horizon disaster can be avoided in the future. (Roland N. Horne is the Thomas Davies Barrow Professor of Earth Sciences at Stanford University, and was the Chairman of Petroleum Engineering from 1995 to 2006. He holds BE, PhD and DSc degrees from the University of Auckland, New Zealand, all in Engineering Science. Horne is a member of the U.S. National Academy of Engineering and is also an Honorary Member of the Society of Petroleum Engineers.)
Controller Synthesis for Constrained Flight Systems via Receding Horizon Optimization
Murray, Richard M.
Controller Synthesis for Constrained Flight Systems via Receding Horizon Optimization Richard M stabilize flight systems us- ing receding horizon, optimal control.1,8 This pa- per advocates the use functions at the inner and outer loop levels and significantly enhances the ability of the control system
Organic Aerosol Formation Downwind from the Deepwater Horizon Oil Spill
Toohey, Darin W.
Organic Aerosol Formation Downwind from the Deepwater Horizon Oil Spill Nicole ONeill - ATOC 3500 and aerosol composition of air over the Deepwater Horizon oil spill in the Gulf of Mexico. · The lightest chemicals in the oil evaporated within hours, as scientists expected them to do. What they didn't expect
Finite-Horizon Optimal Transmission Policies for Energy Harvesting Sensors
Jagannathan, Krishna
Finite-Horizon Optimal Transmission Policies for Energy Harvesting Sensors Rahul Vaze School: krishnaj@ee.iitm.ac.in Abstract--In this paper, we derive optimal transmission poli- cies for energy harvesting sensors to maximize the utility obtained over a finite horizon. First, we consider a single energy
Airships: A New Horizon for Science
Miller, Sarah H; Hillenbrand, Lynne; Rhodes, Jason; Baird, Gil; Blake, Geoffrey; Booth, Jeff; Carlile, David E; Duren, Riley; Edworthy, Frederick G; Freeze, Brent; Friedl, Randall R; Goldsmith, Paul F; Hall, Jeffery L; Hoffman, Scott E; Hovarter, Scott E; Jensen-Clem, Rebecca M; Jones, Ross M; Kauffmann, Jens; Kiessling, Alina; King, Oliver G; Konidaris, Nick; Lachenmeier, Timothy L; Lord, Steven D; Neu, Jessica; Quetin, Gregory R; Ram, Alan; Sander, Stanley; Simard, Marc; Smith, Mike; Smith, Steve; Smoot, Sara; Susca, Sara; Swann, Abigail; Young, Eliot F; Zambrano, Thomas
2014-01-01T23:59:59.000Z
The "Airships: A New Horizon for Science" study at the Keck Institute for Space Studies investigated the potential of a variety of airships currently operable or under development to serve as observatories and science instrumentation platforms for a range of space, atmospheric, and Earth science. The participants represent a diverse cross-section of the aerospace sector, NASA, and academia. Over the last two decades, there has been wide interest in developing a high altitude, stratospheric lighter-than-air (LTA) airship that could maneuver and remain in a desired geographic position (i.e., "station-keeping") for weeks, months or even years. Our study found considerable scientific value in both low altitude ( 60 kft) airships across a wide spectrum of space, atmospheric, and Earth science programs. Over the course of the study period, we identified stratospheric tethered aerostats as a viable alternative to airships where station-keeping was valued over maneuverability. By opening up the sky and Earth's strato...
Horizon news function and quasi-local energy-momentum flux near black hole
Yu-Huei Wu
2007-03-27T23:59:59.000Z
From the 'quasi-local' definition of horizons, e.g. isolated horizon and dynamical horizon, the consequence quasi-local energy-momentum near horizons can be observed by using the idea of frame alignment. In particular, we find the horizon news function from the asymptotic expansion near horizons and use this to describe the gravitational flux and change of mass of a black hole.
SunLine Expands Horizons with Fuel Cell Bus Demo. Hydrogen, Fuel...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Expands Horizons with Fuel Cell Bus Demo. Hydrogen, Fuel Cells & Infrastructure Technologies Program, Fuel Cell Bus Demonstration Projects (Fact Sheet). SunLine Expands Horizons...
Horizon structure of rotating Einstein-Born-Infeld black holes and shadow
Atamurotov, Farruh; Ahmedov, Bobomurat
2015-01-01T23:59:59.000Z
We investigate the horizon structure of the rotating Einstein-Born-Infeld solution which goes over to the Einstein-Maxwell's Kerr-Newman solution as the Born-Infeld parameter goes to infinity ($\\beta \\rightarrow \\infty$). We find that for a given $\\beta$, mass $M$ and charge $Q$, there exist critical spinning parameter $a_{E}$ and $r_{H}^{E}$, which corresponds to an extremal Einstein-Born-Infeld black hole with degenerate horizons, and $a_{E}$ decreases and $r_{H}^{E}$ increases with increase in the Born-Infeld parameter $\\beta$. While $aEinstein-Born-Infeld black hole with outer and inner horizons. Similarly, the effect of $\\beta$ on infinite redshift surface and in turn on ergoregion is also included. It is well known that a black hole can cast a shadow as an optical appearance due to its strong gravitational field. We also investigate the shadow cast by the non-rotating ($a=0$) Einstein-Born-Infeld black hole and demonstrate that the null geodesic equations can be integr...
Perturbative String Thermodynamics near Black Hole Horizons
Thomas G. Mertens; Henri Verschelde; Valentin I. Zakharov
2014-10-29T23:59:59.000Z
We provide further computations and ideas to the problem of near-Hagedorn string thermodynamics near (uncharged) black hole horizons, building upon our earlier work JHEP 1403 (2014) 086. The relevance of long strings to one-loop black hole thermodynamics is emphasized. We then provide an argument in favor of the absence of $\\alpha'$-corrections for the (quadratic) heterotic thermal scalar action in Rindler space. We also compute the large $k$ limit of the cigar orbifold partition functions (for both bosonic and type II superstrings) which allows a better comparison between the flat cones and the cigar cones. A discussion is made on the general McClain-Roth-O'Brien-Tan theorem and on the fact that different torus embeddings lead to different aspects of string thermodynamics. The black hole/string correspondence principle for the 2d black hole is discussed in terms of the thermal scalar. Finally, we present an argument to deal with arbitrary higher genus partition functions, suggesting the breakdown of string perturbation theory (in $g_s$) to compute thermodynamical quantities in black hole spacetimes.
A note on electrical and thermodynamic properties of Isolated Horizon
Gerui Chen; Xiaoning Wu; Sijie Gao
2014-10-29T23:59:59.000Z
The electrical laws and Carnot cycle of Isolated Horizon (IH) are investigated in this paper. We establish the Ohm's law and Joule's law of an Isolated Horizon, and find that the conceptual picture of black holes (Membrane Paradigm) can also apply to this kind of quasi-local black holes. We also investigate the geometrical properties near a non-rotating IH, and find that under the first-order approximation of r, there exist a Killing vector and a Hamiltonian conjugate to it, so this vector is a physical observer. We calculate the energy as measured at infinity of a particle at rest outside a non-rotating IH, and use this result to construct a reversible Carnot cycle with the Isolated Horizon as a cold reservoir, which confirms the thermodynamic nature of Isolated Horizon.
A note on electrical and thermodynamic properties of Isolated Horizon
Chen, Gerui; Gao, Sijie
2014-01-01T23:59:59.000Z
The electrical laws and Carnot cycle of Isolated Horizon (IH) are investigated in this paper. We establish the Ohm's law and Joule's law of an Isolated Horizon, and find that the conceptual picture of black holes (Membrane Paradigm) can also apply to this kind of quasi-local black holes. We also investigate the geometrical properties near a non-rotating IH, and find that under the first-order approximation of r, there exist a Killing vector and a Hamiltonian conjugate to it, so this vector is a physical observer. We calculate the energy as measured at infinity of a particle at rest outside a non-rotating IH, and use this result to construct a reversible Carnot cycle with the Isolated Horizon as a cold reservoir, which confirms the thermodynamic nature of Isolated Horizon.
Green functions and Euclidean fields near the bifurcate Killing horizon
Z. Haba
2007-08-13T23:59:59.000Z
We approximate a Euclidean version of a D+1 dimensional manifold with a bifurcate Killing horizon by a product of a two-dimensional Rindler space and a D-1 dimensional manifold M. We obtain approximate formulas for the Green functions. We study the behaviour of Green functions near the horizon and their dimensional reduction. We show that if M is compact then the massless minimally coupled quantum field contains a zero mode which is a conformal invariant free field on R^2. Then, the Green function near the horizon can be approximated by the Green function of the two-dimensional quantum field theory. The correction term is exponentially small away from the horizon. If the volume of a geodesic ball is growing to infinity with its radius then the Green function cannot be approximated by a two-dimensional one.
Acoustic measurement of the Deepwater Horizon Macondo well flow rate
Camilli, Richard
On May 31, 2010, a direct acoustic measurement method was used to quantify fluid leakage rate from the Deepwater Horizon Macondo well prior to removal of its broken riser. This method utilized an acoustic imaging sonar and ...
Predictive energy management for hybrid electric vehicles -Prediction horizon and
Paris-Sud XI, Université de
Predictive energy management for hybrid electric vehicles - Prediction horizon and battery capacity of a combined hybrid electric vehicle. Keywords: Hybrid vehicles, Energy Management, Predictive control, Optimal predictive energy management realistic. This energy management strategy uses a dynamic programming algorithm
Approximate Dynamic Programming for a Class of Long-Horizon ...
2014-04-06T23:59:59.000Z
require hours to produce good solutions even when the planning horizon is 90 ... Surveys of general IRPs for all modes of transportation are given in [1] and [9]. .... Dynamic fleet management problems are a special case in this problem class.
String-theoretic breakdown of effective field theory near black hole horizons
Dodelson, Matthew
2015-01-01T23:59:59.000Z
We investigate the validity of the equivalence principle near horizons in string theory, analyzing the breakdown of effective field theory caused by longitudinal string spreading effects. An experiment is set up where a detector is thrown into a black hole a long time after an early infalling string. Light cone gauge calculations, taken at face value, indicate a detectable level of root-mean-square longitudinal spreading of the initial string as measured by the late infaller. This results from the large relative boost between the string and detector in the near horizon region, which develops automatically despite their modest initial energies outside the black hole and the weak curvature in the geometry. We subject this scenario to basic consistency checks, using these to obtain a relatively conservative criterion for its detectability. In a companion paper, we exhibit longitudinal nonlocality in well-defined gauge-invariant S-matrix calculations, obtaining results consistent with the predicted spreading albe...
String-theoretic breakdown of effective field theory near black hole horizons
Matthew Dodelson; Eva Silverstein
2015-04-21T23:59:59.000Z
We investigate the validity of the equivalence principle near horizons in string theory, analyzing the breakdown of effective field theory caused by longitudinal string spreading effects. An experiment is set up where a detector is thrown into a black hole a long time after an early infalling string. Light cone gauge calculations, taken at face value, indicate a detectable level of root-mean-square longitudinal spreading of the initial string as measured by the late infaller. This results from the large relative boost between the string and detector in the near horizon region, which develops automatically despite their modest initial energies outside the black hole and the weak curvature in the geometry. We subject this scenario to basic consistency checks, using these to obtain a relatively conservative criterion for its detectability. In a companion paper, we exhibit longitudinal nonlocality in well-defined gauge-invariant S-matrix calculations, obtaining results consistent with the predicted spreading albeit not in a direct analogue of the black hole process. We discuss applications of this effect to the firewall paradox, and estimate the time and distance scales it predicts for new physics near black hole and cosmological horizons.
Universal thermodynamics in different gravity theories: Modified entropy on the horizons
Saugata Mitra; Subhajit Saha; Subenoy Chakraborty
2015-03-10T23:59:59.000Z
The paper deals with universal thermodynamics for FRW model of the universe bounded by apparent (or event) horizon. Assuming Hawking temperature on the horizon, the unified first law is examined on the horizon for different gravity theories. The results show that equilibrium configuration is preserved with a modification to Bekenstein entropy on the horizon.
Background Knowledge, Category Labels, and Similarity Judgment
Yu, Na-Yung
2011-10-21T23:59:59.000Z
(Figure 2). Procedure. Sixty triads of pictures were presented to participants one at a time in the center of the computer screen. Participants were asked to select the base picture that they judged to be more similar to the target than the other base.... Five pairs of original animal tissue pictures were selected from a well- known textbook of veterinary histology (Bacha & Bacha, 2000). The procedure of creating 60 triads of original and morphed pictures was identical to the procedure described...
Nuclear multifragmentation and fission: similarity and differences
V. Karnaukhov; H. Oeschler; S. Avdeyev; V. Rodionov; V. Kirakosyan; A. Simonenko; P. Rukoyatkin; A. Budzanowski; W. Karcz; I. Skwirczynska; B. Czech; L. Chulkov; E. Kuzmin; E. Norbeck; A. Botvina
2006-02-10T23:59:59.000Z
Thermal multifragmentation of hot nuclei is interpreted as the nuclear liquid--fog phase transition deep inside the spinodal region. The experimental data for p(8.1GeV) + Au collisions are analyzed. It is concluded that the decay process of hot nuclei is characterized by two size parameters: transition state and freeze-out volumes. The similarity between dynamics of fragmentation and ordinary fission is discussed. The IMF emission time is related to the mean rupture time at the multi-scission point, which corresponds to the kinetic freeze-out configuration.
Acceleration of particles near the inner black hole horizon
O. B. Zaslavskii
2011-12-16T23:59:59.000Z
We study the possibility of obtaining unbound energy E_{c.m.} in the centre of mass frame when two particles collide near the inner black hole horizon. We consider two different cases - when both particles move (i) in the same direction or (ii) in the opposite ones. We also discuss two different versions of the effect - whether an infinite energy can be released in the collision (strong version) or the energy E_{c.m.} is finite but can be made as large as one likes (weak version). We demonstrate that the strong version of the effect is impossible in both cases (i) and (ii). In case (i) this is due to the fact that in the situation when E_{c.m.} formally diverges on the horizon, one of particles passes through the bifurcation point where two horizons meet while the second particle does not, so collision does not occur. In case (ii), both particles hit different branches of the horizon. The weak version is possible in both cases, provided at least one of particles starts its motion inside the horizon along the direction of spatial symmetry from infinity.
Nearly extremal apparent horizons in simulations of merging black holes
Geoffrey Lovelace; Mark A. Scheel; Robert Owen; Matthew Giesler; Reza Katebi; Bela Szilagyi; Tony Chu; Nicholas Demos; Daniel A. Hemberger; Lawrence E. Kidder; Harald P. Pfeiffer; Nousha Afshari
2015-02-27T23:59:59.000Z
The spin angular momentum $S$ of an isolated Kerr black hole is bounded by the surface area $A$ of its apparent horizon: $8\\pi S \\le A$, with equality for extremal black holes. In this paper, we explore the extremality of individual and common apparent horizons for merging, rapidly spinning binary black holes. We consider simulations of merging black holes with equal masses $M$ and initial spin angular momenta aligned with the orbital angular momentum, including new simulations with spin magnitudes up to $S/M^2 = 0.994$. We measure the area and (using approximate Killing vectors) the spin on the individual and common apparent horizons, finding that the inequality $8\\pi S A$ and for which our lower bound on their Booth-Fairhurst extremality exceeds unity. These superextremal surfaces are always surrounded by marginally outer trapped surfaces (i.e., by apparent horizons) with $8\\pi Shorizon is always less than unity but can exceed the value for an extremal Kerr black hole. (Abstract abbreviated.)
Thermodynamics of Black Hole Horizons and Kerr/CFT Correspondence
Bin Chen; Shen-xiu Liu; Jia-ju Zhang
2012-11-02T23:59:59.000Z
In this paper we investigate the thermodynamics of the inner horizon and its implication on the holographic description of the black hole. We focus on the black holes with two physical horizons. Under reasonable assumption, we prove that the first law of thermodynamics of the outer horizon always indicates that of the inner horizon. As a result, the fact that the area product being mass-independent is equivalent to the relation $T_+S_+=T_-S_-$, with $T_\\pm$ and $S_\\pm$ being the Hawking temperatures and the entropies of the outer and inner horizon respectively. We find that the mass-independence of area product breaks down in general Myers-Perry black holes with spacetime dimension $d\\geq6$ and Kerr-AdS black holes with $d\\geq4$. Moreover we discuss the implication of the first laws of the outer and inner horizons on the thermodynamics of the right- and left-moving sectors of dual CFT in Kerr/CFT correspondence. We show that once the relation $T_+S_+=T_-S_-$ is satisfied, the central charges of two sectors must be same. Furthermore from the thermodynamics relations, we read the dimensionless temperatures of microscopic CFT, which are in exact agreement with the ones obtained from hidden conformal symmetry in the low frequency scattering off the black holes, and then determine the central charges. This method works well in well-known cases in Kerr/CFT correspondence, and reproduce successfully the holographic pictures for 4D Kerr-Newman and 5D Kerr black holes. We go on to predict the central charges and temperatures of a possible holographic CFT description dual to 5D doubly rotating black ring.
Gibbs Paradox and Similarity Principle
Shu-Kun Lin
2008-11-11T23:59:59.000Z
As no heat effect and mechanical work are observed, we have a simple experimental resolution of the Gibbs paradox: both the thermodynamic entropy of mixing and the Gibbs free energy change are zero during the formation of any ideal mixtures. Information loss is the driving force of these spontaneous processes. Information is defined as the amount of the compressed data. Information losses due to dynamic motion and static symmetric structure formation are defined as two kinds of entropies - dynamic entropy and static entropy, respectively. There are three laws of information theory, where the first and the second laws are analogs of the two thermodynamic laws. However, the third law of information theory is different: for a solid structure of perfect symmetry (e.g., a perfect crystal), the entropy (static entropy for solid state) S is the maximum. More generally, a similarity principle is set up: if all the other conditions remain constant, the higher the similarity among the components is, the higher the value of entropy of the mixture (for fluid phases) or the assemblage (for a static structure or a system of condensed phases) or any other structure (such as quantum states in quantum mechanics) will be, the more stable the mixture or the assemblage will be, and the more spontaneous the process leading to such a mixture or an assemblage or a chemical bond will be.
Spectral properties of acoustic black hole radiation: Broadening the horizon
Finazzi, Stefano; Parentani, Renaud [SISSA, via Bonomea 265, Trieste 34151 (Italy) and INFN sezione di Trieste, Via Valerio 2, Trieste 34127 (Italy); Laboratoire de Physique Theorique, CNRS UMR 8627, Batiment 210, Universite Paris-Sud 11, 91405 Orsay Cedex (France)
2011-04-15T23:59:59.000Z
The sensitivity of the black hole spectrum when introducing short distance dispersion is studied in the context of atomic Bose condensates. By considering flows characterized by several length scales, we show that, while the spectrum remains remarkably Planckian, the temperature is no longer fixed by the surface gravity. Rather it is determined by the average of the flow gradient across the horizon over an interval fixed by the healing length and the surface gravity, as if the horizon were broadened. This remains valid as long as the flow does not induce nonadiabatic effects that produce oscillations or some parametric amplification of the flux.
Thermodynamics on the apparent horizon in generalized gravity theories
Shao-Feng Wu; Bin Wang; Guo-Hong Yang
2008-01-17T23:59:59.000Z
We present a general procedure to construct the first law of thermodynamics on the apparent horizon and illustrate its validity by examining it in some extended gravity theories. Applying this procedure, we can describe the thermodynamics on the apparent horizon in Randall-Sundrum braneworld imbedded in a nontrivial bulk. We discuss the mass-like function which was used to link Friedmann equation to the first law of thermodynamics and obtain its special case which gives the generalized Misner-Sharp mass in Lovelock gravity.
Horizons and Tunneling in the Euclidean False Vacuum
Kate Marvel; Neil Turok
2007-12-17T23:59:59.000Z
In the thin-wall approximation, the decay of a gravitating false vacuum to a lower-energy state is affected by the cosmological horizon structure in both spaces. The nucleation radius of a bubble of true vacuum depends on the surface tension of its boundary and equals the false vacuum cosmological horizon at a critical tension. We argue that there is no tunneling instanton solution beyond the critical tension and argue that there is therefore a bound on allowed membrane tension in theories which rely on semiclassical tunneling to relax the cosmological constant.
Dynamics of the Cosmological Apparent Horizon: Surface Gravity & Temperature
Alexis Helou
2015-02-14T23:59:59.000Z
In the context of thermodynamics applied to our cosmological apparent horizon, we explicit in greater details our previous work which established the Friedmann Equations from projection of Hayward's Unified First Law. In particular, we show that the dynamical Hayward-Kodama surface gravity is perfectly well-defined and is suitable for this derivation. We then relate this surface gravity to a physical notion of temperature, and show this has constant, positive sign for any kind of past-inner trapping horizons. Hopefully this will clarify the choice of temperature in a dynamical Friedmann-Lema\\^itre-Roberston-Walker spacetime.
On the construction of Hartle-Hawking-Israel states across a static bifurcate Killing horizon
Ko Sanders
2015-01-29T23:59:59.000Z
We consider a linear scalar quantum field propagating in a space-time with a static bifurcate Killing horizon and a wedge reflection. We prove the existence of a Hadamard state which is pure, quasi-free, invariant under the Killing flow and which restricts to a double KMS state at the inverse Hawking temperature on the union of the exterior wedge regions. The existence of such a state was first conjectured by Hartle and Hawking (1976) and Israel (1976) for stationary black hole space times. Our result complements a uniqueness result of Kay and Wald (1991), who considered a general bifurcate Killing horizon and proved that a certain (large) subalgebra of the free field algebra admits at most one Hadamard state which is invariant under the Killing flow. In the presence of a wedge reflection this state reduces to a pure, quasi-free KMS state on the smaller subalgebra associated to one of the exterior wedge regions. Our result establishes the existence of such a state on the full algebra in the static case. Our proof follows the arguments of Sewell (1982) and Jacobson (1994), exploiting a Wick rotation in the Killing time coordinate to construct a corresponding Euclidean theory. Because the Killing time coordinate is ill-defined on the bifurcation surface we systematically replace it by a Gaussian normal coordinate. A crucial part of our proof is to establish that the Euclidean ground state satisfies the necessary analogs of analyticity and reflection positivity with respect to this coordinate.
Interlaboratory Analytical Comparison Study to Support Deepwater Horizon
Resource Damage Assessment: Description and Results for Marine Sediment QA10SED01 Michele M. Schantz resource damage assessment (NRDA) in response to the Deepwater Horizon (DWH) oil spill in the Gulf are conducting a natural resource damage assessment (NRDA) to determine what resources have been injured and what
Interlaboratory Analytical Comparison Study to Support Deepwater Horizon
Resource Damage Assessment: Description and Results for Mussel Tissue QA10TIS01 Michele M. Schantz and John resource damage assessment (NRDA) in response to the Deepwater Horizon (DWH) oil spill in the Gulf and state agencies are conducting a natural resource damage assessment (NRDA) to determine what resources
Shear Waves, Sound Waves On A Shimmering Horizon
Omid Saremi
2007-03-19T23:59:59.000Z
In the context of the so called ``membrane paradigm'' of black holes/branes, it has been known for sometime that the dynamics of small fluctuations on the stretched horizon can be viewed as corresponding to diffusion of a conserved charge in simple fluids. To study shear waves in this context properly, one must define a conserved stress tensor living on the stretched horizon. Then one is required to show that such a stress tensor satisfies the corresponding constitutive relations. These steps are missing in a previous treatment of the shear perturbations by Kovtun, Starinets and Son. In this note, we fill the gap by prescribing the stress tensor on the stretched horizon to be the Brown and York (or Balasubramanian-Kraus (BK) in the AdS/CFT context) holographic stress tensor. We are then able to show that such a conserved stress tensor satisfies the required constitutive relation on the stretched horizon using Einstein equations. We read off the shear viscosity from the constitutive relations in two different channels, shear and sound. We find an expression for the shear viscosity in both channels which are equal, as expected. Our expression is in agreement with a previous membrane paradigm formula reported by Kovtun, Starinets and Son.
Adaptive Receding Horizon Control of a Distributed Collector Solar Field
Sontag, Eduardo
for a distributed collector solar field which ex- plicitly explores its distributed parameter character. The plant, distributed collector solar fields are repre- sentative of an important class of distributed parameter plantsAdaptive Receding Horizon Control of a Distributed Collector Solar Field J.M. Igreja, J. M. Lemos
SC-RISE LECTURE SERIES BRIGHT HORIZONS IN SOLAR ENERGY
SC-RISE LECTURE SERIES BRIGHT HORIZONS IN SOLAR ENERGY Sustainable Energy Opportunities, Options are being developed including biomass, geothermal, hydropower, ocean thermal energy conversion, solar electric, solar thermal, and wind. However, such aspects as low energy density, siting, and temporal
Soil Horizons Some Noteworthy Soil Science in Wisconsin
Mladenoff, David
Soil Horizons Some Noteworthy Soil Science in Wisconsin Alfred E. Hartemink The impact and benefits of soil science have only partly been documented. Here I highlight four noteworthy soil science achievements from the state of Wisconsin that took place between 1870 and the early 1980s: (i) the first soil
Deepwater Horizon Study Group 3 Environmental Report January 2011
Silver, Whendee
to 53,000 barrels a day as the reservoir gradually depleted itself. 4.9 million barrels (205.8 million The Deepwater Horizon oil rig exploded 5,000 feet below the surface of the Gulf of Mexico on April 20, 2010. The Flow Rate Technical Group estimates the leak initially produced 62,000 barrels of oil a day and eased
Seismic Volume Visualization for Horizon Extraction Daniel Patel
present a novel system for rapidly interpret- ing and visualizing seismic volumetric data. First we to seismic data interpretation. Keywords: Seismic interpretation, Seismic horizons, Volume ren- dering hydrocarbons are trapped. In this paper we present a system for rapid interpretation of seismic reflection
Spherical collapse with heat flow and without horizon
A. Banerjee; S. Chatterjee; N. Dadhich
2002-09-10T23:59:59.000Z
We present a class of solutions for a heat conducting fluid sphere, which radiates energy during collapse without the appearance of horizon at the boundary at any stage of the collapse. A simple model shows that there is no accumulation of energy due to collapse since it radiates out at the same rate as it is being generated.
Evolution of the horizons for dark energy universe
Ritabrata Biswas; Nairwita Mazumder; Subenoy Chakraborty
2011-06-12T23:59:59.000Z
Recent observational evidences of accelerating phase of the universe strongly demand that the dominating matter in the universe is in the form of dark energy. In this work, we study the evolution of the apparent and event horizons for various dark energy models and examine their behavior across phantom barrier line.
Causal temperature profiles in horizon-free collapse
N F Naidu; M Govender
2005-10-04T23:59:59.000Z
We investigate the causal temperature profiles in a recent model of a radiating star undergoing dissipative gravitational collapse without the formation of an horizon. It is shown that this simple exact model provides a physically reasonable behaviour for the temperature profile within the framework of extended irreversible thermodynamics.
An Efficient and Accurate Method for Evaluating Time Series Similarity
Michigan, University of
, the methods whose matching criteria is bounded by a specified threshold value, such as the LCSS and the EDR to evaluate such threshold value techniques, including LCSS and EDR. Using FTSE, we show that these techniques in a framework that can evaluate a richer range of threshold-based scoring techniques, of which EDR and LCSS
Horizon Dynamics of Evaporating Black Holes in a Higher Dimensional Inflationary Universe
Manasse Mbonye
1999-08-19T23:59:59.000Z
Spherically symmetric Black Holes of the Vaidya type are examined in an asymptotically de Sitter, higher dimensional spacetime. The various horizons are located. The structure and dynamics of such horizons are studied.
Microbial gene functions enriched in the Deepwater Horizon deep-sea oil plume
Lu, Z.
2012-01-01T23:59:59.000Z
Horizon oil spill in the Gulf of Mexico is the deepest andof Gulf of Mexico from other historic offshore oil spillsDeepwater Horizon oil spill in the Gulf of Mexico was one of
Liouville theory beyond the cosmological horizon
Geoffrey Compère; Laura Donnay; Pierre-Henry Lambert; Waldemar Schulgin
2015-04-29T23:59:59.000Z
The dS/CFT correspondence postulates the existence of a Euclidean CFT dual to a suitable gravity theory with Dirichlet boundary conditions asymptotic to de Sitter spacetime. A semi-classical model of such a correspondence consists of Einstein gravity with positive cosmological constant and without matter which is dual to Euclidean Liouville theory defined at the future conformal boundary. Here we show that Euclidean Liouville theory is also dual to Einstein gravity with Dirichlet boundary conditions on a fixed timelike slice in the static patch. Intriguingly, the spacetime interpretation of Euclidean Liouville time is the physical time of the static observer. As a prerequisite of this correspondence, we show that the asymptotic symmetry algebra which consists of two copies of the Virasoro algebra extends everywhere into the bulk.
Is thermodynamics of the universe bounded by the event horizon a Bekenstein system?
Subenoy Chakraborty
2012-11-12T23:59:59.000Z
In this brief communication, we have studied the validity of the first law of thermodynamics for the universe bounded by event horizon with two examples. The key point is the appropriate choice of the temperature on the event horizon. Finally, we have concluded that universe bounded by the event horizon may be a Bekenstein system and the Einstein's equations and the first law of thermodynamics on the event horizons are equivalent.
LE BULLETIN DE L'EPI N 43 LOGICIELS DIDACT, HORIZON, ROSEAU PROPOS DES LOGICIELS
Paris-Sud XI, UniversitÃ© de
141 LE BULLETIN DE L'EPI NÂ° 43 LOGICIELS DIDACT, HORIZON, ROSEAU Ã? PROPOS DES LOGICIELS DIDACT supprimer sur une disquette en unitÃ© FL0 les fichiers utilisateurs crÃ©Ã©s par Didact, Horizon ou Roseau CP BULLETIN DE L'EPI LOGICIELS DIDACT, HORIZON, ROSEAU d) le travail se fait. Noter que pour une deuxiÃ¨me
Deepwater Horizon Study Finds Crude Oil Harmful to Bluefin, Yellowfin Tuna
Grosell, Martin
, as a large plume of smoke rises from fires on BP's Deepwater Horizon offshore oil rig. Image: Gerald Herbert Deepwater Horizon oil spill caused malformations in developing hearts of yellowfin and bluefin tuna the Deepwater Horizon spill. An Atlantic bluefin tuna. Image: Wikimedia Commons #12;They found a variety
Toohey, Darin W.
Atmospheric emissions from the Deepwater Horizon spill constrain airwater partitioning, hydrocarbon amounts (258,000 kg/day) of hydrocarbons evaporating promptly from the Deepwater Horizon spill; these data. Citation: Ryerson, T. B., et al. (2011), Atmo- spheric emissions from the Deepwater Horizon spill constrain
accurate similarity search: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
faster query processing time as compared to state-of-the-art indexing methods such as Daylight fingerprints, C-tree and GraphGrep. Conclusions: Efficient similarity query...
Connecting horizon pixels and interior voxels of a black hole
Piero Nicolini; Douglas Singleton
2014-10-03T23:59:59.000Z
In this paper we discuss to what extent one can infer details of the interior structure of a black hole based on its horizon. Recalling that black hole thermal properties are connected to the non-classical nature of gravity, we circumvent the restrictions of the no hair theorem by postulating that the black hole interior is singularity free due to violations of the usual energy conditions. Further these conditions allow one to establish a one-to-one, holographic projection between Planckian areal "bits" on the horizon and "voxels", representing the gravitational degrees of freedom in the black hole interior. We illustrate the repercussions of this idea by discussing an example of the black hole interior consisting of a de Sitter core postulated to arise from the local graviton quantum vacuum energy. It is shown that the black hole entropy can emerge as the statistical entropy of a gas of voxels.
A time and frequency domain analysis of contrarian trading strategies/
Chaudhuri, Shomesh E
2014-01-01T23:59:59.000Z
This thesis applies time and frequency domain analyses to a high-frequency market making strategy to study the profitability of liquidity provision over multiple time horizons from 1964 to 2013. Using daily returns and ...
Optimization of time-based rates in forward energy markets
Wang, J.
This paper presents a new two-step design approach of Time-Based Rate (TBR) programs for markets with a high penetration of variable energy sources such as wind power. First, an optimal market time horizon must be determined ...
Iridium abundance measurements across bio-event horizons in the fossil record
Orth, C.J.; Attrep, M. Jr.; Quintana, L.R. (Los Alamos National Lab., NM (USA))
1989-01-01T23:59:59.000Z
Geochemical measurements have been performed on thousands of rock samples collected across bio-event horizons using Instrumental Neutron Activation Analysis (INAA) for about 40 common and trace elements and radiochemical isolation procedures for Ir. On selected samples, Os, Pt and Au were also radiochemically determined. These studies have encompassed the time interval from the Precambrian-Cambrian transition to the Late Eocene impact (microspherule) horizons. Our early work strengthened the Alvarez impact hypothesis by finding the Ir (PGE) anomaly at the K-T boundary in continental sedimentary sequences. In collaborations with paleontologists, weak to moderately string Ir anomalies have been discovered at the Frasnian-Famennian boundary in Australia, in the Early Mississippian of Oklahoma, at the Mississipian-Pennsylvanian boundary of Oklahoma and Texas, and in the Late Cenomanian throughout the western interior of North America and on the south coast of England to date. We have found no compelling evidence for an impact related cause for these anomalies although PGE impact signatures in the two Late Cenomanian anomalies could be masked by the strong terrestrial mafic to ultramafic overprint. Thus far, our evidence for extinction events older than the terminal Cretaceous does not support recent hypotheses which suggest that impacts from cyclic swarms of comets in the inner Solar system were responsible for the periodic mass extinctions. 50 refs., 7 figs., 3 tabs.
Gödel black hole, closed timelike horizon, and the study of particle emissions
Sourav Bhattacharya; Anirban Saha
2010-07-22T23:59:59.000Z
We show that a particle, with positive orbital angular momentum, following an outgoing null/timelike geodesic, shall never reach the closed timelike horizon (CTH) present in the $(4+1)$-dimensional rotating G\\"{o}del black hole space-time. Therefore a large part of this space-time remains inaccessible to a large class of geodesic observers, depending on the conserved quantities associated with them. We discuss how this fact and the existence of the closed timelike curves present in the asymptotic region make the quantum field theoretic study of the Hawking radiation, where the asymptotic observer states are a pre-requisite, unclear. However, the semiclassical approach provides an alternative to verify the Smarr formula derived recently for the rotating G\\"{o}del black hole. We present a systematic analysis of particle emissions, specifically for scalars, charged Dirac spinors and vectors, from this black hole via the semiclassical complex path method.
A quantum peek inside the black hole event horizon
Sumanta Chakraborty; Suprit Singh; T. Padmanabhan
2015-03-14T23:59:59.000Z
We solve the Klein-Gordon equation for a scalar field, in the background geometry of a dust cloud collapsing to form a black hole, everywhere in the (1+1) spacetime: that is, both inside and outside the event horizon and arbitrarily close to the curvature singularity. This allows us to determine the regularized stress tensor expectation value, everywhere in the appropriate quantum state (viz., the Unruh vacuum) of the field. We use this to study the behaviour of energy density and the flux measured in local inertial frames for the radially freely falling observer at any given event. Outside the black hole, energy density and flux lead to the standard results expected from the Hawking radiation emanating from the black hole, as the collapse proceeds. Inside the collapsing dust ball, the energy densities of both matter and scalar field diverge near the singularity in both (1+1) and (1+3) spacetime dimensions; but the energy density of the field dominates over that of classical matter. In the (1+3) dimensions, the total energy (of both scalar field and classical matter) inside a small spatial volume around the singularity is finite (and goes to zero as the size of the region goes to zero) but the total energy of the quantum field still dominates over that of the classical matter. Inside the event horizon, but \\textit{outside} the collapsing matter, freely falling observers find that the energy density and the flux diverge close to the singularity. In this region, even the integrated energy inside a small spatial volume enclosing the singularity diverges. This result holds in both (1+1) and (1+3) spacetime dimensions with a \\emph{milder} divergence for the total energy inside a small region in (1+3) dimensions. These results suggest that the back-reaction effects are significant even in the region \\emph{outside the matter but inside the event horizon}, close to the singularity.
Complete single-horizon quantum corrected black hole spacetime
Peltola, Ari; Kunstatter, Gabor [Department of Physics and Winnipeg Institute for Theoretical Physics, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, R3B 2E9 (Canada)
2009-03-15T23:59:59.000Z
We show that a semiclassical polymerization of the interior of Schwarzschild black holes gives rise to a tantalizing candidate for a nonsingular, single-horizon black hole spacetime. The exterior has nonzero quantum stress energy but closely approximates the classical spacetime for macroscopic black holes. The interior exhibits a bounce at a microscopic scale and then expands indefinitely to a Kantowski-Sachs spacetime. Polymerization therefore removes the singularity and produces a scenario reminiscent of past proposals for universe creation via quantum effects inside a black hole.
DOE's Portal to Deepwater Horizon Oil Spill Data
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
On April 20, 2010, the Deepwater Horizon platform in the Gulf of Mexico exploded. The explosion and fire killed and injured workers on the oil rig, and caused major releases of oil and gas into the Gulf for several months. The Department of Energy, in keeping with the Obama Administrations ongoing commitment to transparency, provided online access to data and information related to the response to the BP oil spill. Included are schematics, pressure tests, diagnostic results, video clips, and other data. There are also links to the Restore the Gulf website, to the trajectory forecasts from NOAA, and oil spill information from the Environmental Protection Agency.
Horizon City, Texas: Energy Resources | Open Energy Information
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Horizon Fuel Cell Technologies Pte Ltd | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformationHorizon Fuel Cell Technologies Pte Ltd Jump
Self-similar spherical shock solution with sustained energy injection
V. I. Dokuchaev
2002-09-20T23:59:59.000Z
We present the generalization of the Sedov-Taylor self-similar strong spherical shock solution for the case of a central energy source varying in time, $E=A t^k$, where $A$ and $k$ are constants. The known Sedov-Taylor solution corresponds to a particular adiabatic case of $k=0$ or \\emph{instant shock} with an instant energy source of the shock, $E=A$. The self-similar hydrodynamic flow in the nonadiabatic $k\
Extremal Rotating Black Holes in the Near-Horizon Limit: Phase Space and Symmetry Algebra
Compère, G; Seraj, A; Sheikh-Jabbari, M M
2015-01-01T23:59:59.000Z
We construct the NHEG phase space, the classical phase space of Near-Horizon Extremal Geometries with fixed angular momenta and entropy, and with the largest symmetry algebra. We focus on vacuum solutions to $d$ dimensional Einstein gravity. Each element in the phase space is a geometry with $SL(2,R)\\times U(1)^{d-3}$ Killing isometries which has vanishing $SL(2,R)$ and constant $U(1)$ charges. We construct an on-shell vanishing symplectic structure, which leads to an infinite set of symplectic symmetries. In four spacetime dimensions, the phase space is unique and the symmetry algebra consists of the familiar Virasoro algebra, while in $d > 4$ dimensions the symmetry algebra, the NHEG algebra, contains infinitely many Virasoro subalgebras. The nontrivial central term of the algebra is proportional to the black hole entropy. This phase space and in particular its symmetries might serve as a basis for a semiclassical description of extremal rotating black hole microstates.
Black Hole spin dependence of general relativistic multi-transonic accretion close to the horizon
Tapas K. Das; Sankhasubhra Nag; Swathi Hegde; Sourav Bhattacharya; Ishita Maity; Bozena Czerny; Paramita Barai; Paul J. Wiita; Vladimir Karas; Tapan Naskar
2014-12-31T23:59:59.000Z
We introduce a novel formalism to investigate the role of the spin angular momentum of astrophysical black holes in influencing the behaviour of low angular momentum general relativistic accretion. We propose a metric independent analysis of axisymmetric general relativistic flow, and consequently formulate the space and time dependent equations describing the general relativistic hydrodynamic accretion flow in the Kerr metric. The associated stationary critical solutions for such flow equations are provided and the stability of the stationary transonic configuration is examined using an elegant linear perturbation technique. We examine the properties of infalling material for both prograde and retrograde accretion as a function of the Kerr parameter at extremely close proximity to the event horizon. Our formalism can be used to identify a new spectral signature of black hole spin, and has the potential of performing the black hole shadow imaging corresponding to the low angular momentum accretion flow.
From similarity to inference Matthew Weber
Osherson, Daniel
From similarity to inference Matthew Weber Princeton University Daniel Osherson Princeton anonymous referees for constructive commentary. Weber ac- knowledges support from an NSF graduate research
Time Domain Partitioning of Electricity Production Cost Simulations
Barrows, C.; Hummon, M.; Jones, W.; Hale, E.
2014-01-01T23:59:59.000Z
Production cost models are often used for planning by simulating power system operations over long time horizons. The simulation of a day-ahead energy market can take several weeks to compute. Tractability improvements are often made through model simplifications, such as: reductions in transmission modeling detail, relaxation of commitment variable integrality, reductions in cost modeling detail, etc. One common simplification is to partition the simulation horizon so that weekly or monthly horizons can be simulated in parallel. However, horizon partitions are often executed with overlap periods of arbitrary and sometimes zero length. We calculate the time domain persistence of historical unit commitment decisions to inform time domain partitioning of production cost models. The results are implemented using PLEXOS production cost modeling software in an HPC environment to improve the computation time of simulations while maintaining solution integrity.
Did the northeastern Gulf of Mexico become greener after the Deepwater Horizon oil spill?
Meyers, Steven D.
#12;Did the northeastern Gulf of Mexico become greener after the Deepwater Horizon oil spill; published 3 May 2011. [1] Assessment of direct and indirect impacts of oil and dispersants on the marine ecosystem in the northeastern Gulf of Mexico (NEGOM) from the Deepwater Horizon oil spill (April July 2010
Pressure Solution: Possible Mechanism for Silicate Grain Dissolution in a Petrocalcic Horizon
Ahmad, Sajjad
Pressure Solution: Possible Mechanism for Silicate Grain Dissolution in a Petrocalcic Horizon H in southern New Mexico, up to 58% of the silicate grains have dissolution fea- tures, such as embayed-solution mechanism in the petrocaIcic horizon: (i) silicate grains are smooth where they contact pores, but serrated
in the short-term speculative component of the stock price. Current shareholders benefit from the option` information environments. When a firm`s managerial incentive horizon is short, it is more likely to report are consistent with the hypothesis that short incentive horizons induce managers to adopt strategies that reduce
Genomic and physiological footprint of the Deepwater Horizon oil spill on resident marsh fishes
Whitehead, Andrew
9, 2010), during the peak of oil landfall (June 2830, 2010), and after much of the surface oilGenomic and physiological footprint of the Deepwater Horizon oil spill on resident marsh fishes June 13, 2011) The biological consequences of the Deepwater Horizon oil spill are unknown, especially
Deepwater Horizon oil left tuna, other species with heart defects likely to prove fatal
Grosell, Martin
shows that the 2010 BP oil spill spawned deformities in bluefin tuna thereby impeding their ability Horizon oil spill struck at the very heart of fish, a new study says. Exposed to millions of gallons anniversary of the Exxon Valdez oil spill in Alaska's Prince William Sound. Oil from Deepwater Horizon spill
Office of Response and Restoration Emergency Response Division Deepwater Horizon BP Oil Spill
Office of Response and Restoration · Emergency Response Division Deepwater Horizon BP Oil Spill result if oil spilling from the Deepwater Horizon site continues until a relief well successfully stops based on a scenario that assumes a significant continuing spill. Some of these impacts may be weeks
Clement, Prabhakar
Chemical fingerprinting of petroleum biomarkers in Deepwater Horizon oil spill samples collected of Civil Engineering, Auburn University, Auburn, AL 36849, USA a r t i c l e i n f o Keywords: BP oil spill Deepwater Horizon oil spill Hopane analysis Fingerprinting Tar balls a b s t r a c t We compare
Statistics of black hole radiance and the horizon area spectrum
Bekenstein, Jacob D
2015-01-01T23:59:59.000Z
The statistical response of a Kerr black hole to incoming quantum radiation has heretofore been studied by the methods of maximum entropy or quantum field theory in curved spacetime. Neither approach pretends to take into account the quantum structure of the black hole itself. To address this last issue we calculate here the conditional probability distribution associated with the hole's response by assuming that the horizon area has a discrete quantum spectrum, and that its quantum evolution corresponds to jumps between adjacent area eigenvalues, possibly occurring in series, with consequent emission or absorption of quanta, possibly in the same mode. This "atomic" model of the black hole is implemented in two different ways and recovers the previously calculated radiation statistics in both cases. The corresponding conditional probably distribution is here expressed in closed form in terms of an hypergeometric function.
Lithophysal Rock Mass Mechanical Properties of the Repository Host Horizon
D. Rigby
2004-11-10T23:59:59.000Z
The purpose of this calculation is to develop estimates of key mechanical properties for the lithophysal rock masses of the Topopah Spring Tuff (Tpt) within the repository host horizon, including their uncertainties and spatial variability. The mechanical properties to be characterized include an elastic parameter, Young's modulus, and a strength parameter, uniaxial compressive strength. Since lithophysal porosity is used as a surrogate property to develop the distributions of the mechanical properties, an estimate of the distribution of lithophysal porosity is also developed. The resulting characterizations of rock parameters are important for supporting the subsurface design, developing the preclosure safety analysis, and assessing the postclosure performance of the repository (e.g., drift degradation and modeling of rockfall impacts on engineered barrier system components).
Thermodynamics of Evolving Lorentzian Wormhole at Apparent and Event Horizons
Ujjal Debnath; Mubasher Jamil; R. Myrzakulov; M. Akbar
2012-04-06T23:59:59.000Z
We have investigated the non-static Lorentzian Wormhole model in presence of anisotropic pressure. We have presented some exact solutions of Einstein equations for anisotropic pressure case. Introducing two EoS parameters we have shown that these solutions give very rich dynamics of the universe yielding to the different expansion history of it in the $r$ - direction and in the $T$ - direction. The corresponding explicit forms of the shape function $b(r)$ is presented.We have shown that the Einstein's field equations and unified first law are equivalent for the dynamical wormhole model. The first law of thermodynamics has been derived by using the Unified first law. The physical quantities including surface gravity and the temperature are derived for the wormhole. Here we have obtained all the results without any choice of the shape function. The validity of generalized second law (GSL) of thermodynamics has been examined at apparent and event horizons for the evolving Lorentzian wormhole.
Submesoscale dispersion in the vicinity of the Deepwater Horizon spill
Poje, Andrew C; Lipphardt,, Bruce; Haus, Brian K; Ryan, Edward H; Haza, Angelique C; Reniers, A J H M; Olascoaga, Josefina; Novelli, Guillaume; Beron-Vera, Francisco J; Chen, Shuyi; Mariano, Arthur J; Jacobs, Gregg; Hogan, Pat; Coelho, Emanuel; Kirwan,, A D; Huntley, Helga; Griffa, Annalisa
2014-01-01T23:59:59.000Z
Reliable forecasts for the dispersion of oceanic contamination are important for coastal ecosystems, society and the economy as evidenced by the Deepwater Horizon oil spill in the Gulf of Mexico in 2010 and the Fukushima nuclear plant incident in the Pacific Ocean in 2011. Accurate prediction of pollutant pathways and concentrations at the ocean surface requires understanding ocean dynamics over a broad range of spatial scales. Fundamental questions concerning the structure of the velocity field at the submesoscales (100 meters to tens of kilometers, hours to days) remain unresolved due to a lack of synoptic measurements at these scales. \\textcolor{black} {Using high-frequency position data provided by the near-simultaneous release of hundreds of accurately tracked surface drifters, we study the structure of submesoscale surface velocity fluctuations in the Northern Gulf Mexico. Observed two-point statistics confirm the validity of classic turbulence scaling laws at 200m$-$50km scales and clearly indicate tha...
Generalized second law of thermodynamics on the apparent horizon in modified Gauss-Bonnet gravity
Abdolmaleki, A
2015-01-01T23:59:59.000Z
Modified gravity and generalized second law (GSL) of thermodynamics are interesting topics in the modern cosmology. In this regard, we investigate the GSL of gravitational thermodynamics in the framework of modified Gauss-Bonnet gravity or f(G)-gravity. We consider a spatially FRW universe filled with the matter and radiation enclosed by the dynamical apparent horizon with the Hawking temperature. For two viable f(G) models, we first numerically solve the set of differential equations governing the dynamics of f(G)-gravity. Then, we obtain the evolutions of the Hubble parameter, the Gauss-Bonnet curvature invariant term, the density and equation of state parameters as well as the deceleration parameter. In addition, we check the energy conditions for both models and finally examine the validity of the GSL. For the selected f(G) models, we conclude that both models have a stable de Sitter attractor. The equation of state parameters behave quite similar to those of the LCDM model in the radiation/matter dominat...
Non-Hermitian Hamiltonians and similarity transformations
Francisco M. Fernández
2015-03-06T23:59:59.000Z
We show that similarity (or equivalent) transformations enable one to construct non-Hermitian operators with real spectrum. In this way we can also prove and generalize the results obtained by other authors by means of a gauge-like transformation and its generalization. Such similarity transformations also reveal the connection with pseudo-Hermiticity in a simple and straightforward way. In addition to it we consider the positive and negative eigenvalues of a three-parameter non-Hermitian oscillator.
Marital satisfaction and occupational interest similarity
Rouse, Lawrence W
1980-01-01T23:59:59.000Z
multiple variables of personality, background, and similarity of self perception in 20 couples. In relation to cultural factors, Burgess and Cottrell (1938) found that similarity of family background was important in marital adjustment. Many researchers.... ). 1979 "A users guide to SAS (1979 Ed. ). Raleigh, North Carolina: SAS Institute, Inc. Hicks, M. W. , and M. Platt. 1970 "Marital happiness and stability: A review of the research in the sixties. " Journal of Marriage and the Family 32 (November): 553...
hal-00144535,version1-3May2007 Cosmological energy in a thermo-horizon and the
Paris-Sud XI, Université de
the first law and the definition of the total energy contained inside the horizon. This contradiction, 8] and the definition of the energy contained inside the horizon, independently of the choice from the first law and the definition of the energy inside the horizon. We then show
Origin of matter and space-time in the big bang
Mathews, G. J. [University of Notre Dame, Center for Astrophysics/JINA, Notre Dame, IN 46556, USA and Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Kajino, T. [Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan and Department of Astronomy, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Yamazaki, D. [Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Kusakabe, M. [School of Liberal Arts and Science, Korea Aerospace University, Goyang 412-791, Korea and Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of); Cheoun, M.-K. [Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of)
2014-05-02T23:59:59.000Z
We review the case for and against a bulk cosmic motion resulting from the quantum entanglement of our universe with the multiverse beyond our horizon. Within the current theory for the selection of the initial state of the universe from the landscape multiverse there is a generic prediction that pre-inflation quantum entanglement with other universes should give rise to a cosmic bulk flow with a correlation length of order horizon size and a velocity field relative to the expansion frame of the universe. Indeed, the parameters of this motion are are tightly constrained. A robust prediction can be deduced indicating that there should be an overall motion of of about 800 km/s relative to the background space time as defined by the cosmic microwave background (CMB). This talk will summarize the underlying theoretical motivation for this hypothesis. Of course our motion relative to the background space time (CMB dipole) has been known for decades and is generally attributed to the gravitational pull of the local super cluster. However, this cosmic peculiar velocity field has been recently deduced out to very large distances well beyond that of the local super cluster by using X-ray galaxy clusters as tracers of matter motion. This is achieved via the kinematic component of the Sunyaev-Zeldovich (KSZ) effect produced by Compton scattering of cosmic microwave background photons from the local hot intracluster gas. As such, this method measures peculiar velocity directly in the frame of the cluster. Similar attempts by our group and others have attempted to independently assess this bulk flow via Type la supernova redshifts. In this talk we will review the observation case for and against the existence of this bulk flow based upon the observations and predictions of the theory. If this interpretation is correct it has profound implications in that we may be observing for the first time both the physics that occurred before the big bang and the existence of the multiverse beyond our horizon.
Free Energies and Probe Actions for Near-horizon D-branes and D1 + D5 System
Shijong Ryang
1999-03-18T23:59:59.000Z
By working with the free energy for the type II supergravity near-horizon solution of N coincident non-extremal Dp-branes we study the transitions among the non-conformal Dp-brane system, the perturbative super Yang-Mills theory and a certain system associated with M theory. We derive a relation between this free energy and the action of a Dp-brane probe in the N Dp-brane background. Constructing the free energy for the five dimensional black hole labeled by the D1-brane and D5-brane charges we find the similar relation between it and the action of a D1 or D5 brane probe in the D1 + D5 brane background. These relations are explained by the massive open strings stretched between the relevant D-branes
Spherically symmetric self-similar solutions and their astrophysical and cosmological applications
B. J. Carr
2000-03-02T23:59:59.000Z
We discuss spherically symmetric perfect fluid solutions of Einstein's equations which have equation of state ($p=\\alpha \\mu$) and which are self-similar in the sense that all dimensionless variables depend only upon $z\\equiv r/t$. For each value of $\\alpha$, such solutions are described by two parameters and have now been completely classified. There is a 1-parameter family of solutions asymptotic to the flat Friedmann model at large values of z. These represent either black holes or density perturbations which grow as fast as the particle horizon; the underdense solutions may be relevant to the existence of large-scale cosmic voids. There is also a 1-parameter family of solutions asymptotic to a self-similar Kantowski-Sachs model at large z. These are probably only physically realistic for $-11/5$, there is a family of solutions which are asymptotically Minkowski. These asymptote either to infinite z, in which case they are described by one parameter, or to a finite value of z, in which case they are described by two parameters and this includes the ``critical'' solution for $\\alpha >0.28$. We discuss the stability of spherically symmetric similarity solutions to more general (non-self-similar) spherically symmetric perturbations.
Similarity Dimension of a Glaciated Terrain
Jackson, Daniel R.
rate of movement. #12;Data Acquisition · The topography of a formerly glaciated surface the proportionality constant b from the previous equation. #12;Application to Topography · The topography of a region, it becomes possible to evaluate the length and similarity dimension of topography as Richardson
Accelerated Learning without Semantic Similarity: Indirect Objects
Friedman, Nir
types. Transfer apparently facilitates the learning of this type of information from the input1 Accelerated Learning without Semantic Similarity: Indirect Objects ANAT NINIO* Abstract The hypothesis was tested that transfer and facilitation of learning in early syntactic development does not rely
Self-similar measures Christoph Bandt
Bandt, Christoph
gasket S (#12;gure 1) was used as a universal toy model for catalysts and other porous materials concrete examples in this class. There is a real discrepancy between the well-developed "harmonic analysis on self- similar fractals" and the small number of concrete spaces for which this theory works. Here we
Self-similar measures Christoph Bandt
Bandt, Christoph
S (figure 1) was used as a universal toy model for catalysts and other porous materials. A Laplacian concrete examples in this class. There is a real discrepancy between the well-developed "harmonic analysis on self- similar fractals" and the small number of concrete spaces for which this theory works. Here we
New Horizons for Hydrogen: Producing Hydrogen from Renewable Resources
Not Available
2011-02-01T23:59:59.000Z
Recent events have reminded us of the critical need to transition from crude oil, coal, and natural gas toward sustainable and domestic sources of energy. One reason is we need to strengthen our economy. In 2008 we saw the price of oil reach a record $93 per barrel. With higher oil prices, growing demand for gasoline, and increasing oil imports, an average of $235 billion per year, has left the United States economy to pay for foreign oil since 2005, or $1.2 trillion between 2005 and 2009. From a consumer perspective, this trend is seen with an average gasoline price of $2.50 per gallon since 2005, compared to an average of $1.60 between 1990 and 2004 (after adjusting for inflation). In addition to economic impacts, continued reliance on fossil fuels increases greenhouse gas emissions that may cause climate change, health impacts from air pollution, and the risk of disasters such as the Deepwater Horizon oil spill. Energy efficiency in the form of more efficient vehicles and buildings can help to reduce some of these impacts. However, over the long term we must shift from fossil resources to sustainable and renewable energy sources.
The Geometric Invariants of Null Cartan Curves Under The Similarity Transformations
Hakan Simsek; Mustafa Özdemir
2015-04-07T23:59:59.000Z
In this paper, we study the differential geometry of null Cartan curves under the similarity transformations in the Minkowski space-time. Besides, we extend the fundamental theorem for a null Cartan curve according to a similarity motion. We find the equations of all self-similar null curves which is given its shape Cartan curvatures.
Dynamic Vehicle Routing for Translating Demands: Stability Analysis and Receding-Horizon Policies
Bopardikar, Shaunak D.
We introduce a problem in which demands arrive stochastically on a line segment, and upon arrival, move with a fixed velocity perpendicular to the segment. We design a receding horizon service policy for a vehicle with ...
Expanding Research Horizons: USDA Forest Service Initiative for Developing Recycled Paper Technology
Abubakr, Said
Forest Service research on recycling is being led by scientists at the Forest Products Laboratory (FPLExpanding Research Horizons: USDA Forest Service Initiative for Developing Recycled Paper Technology Theodore L. Laufenberg, Program Manager Forest Products Conservation and Recycling Said Abubakr
EFT Beyond the Horizon: Stochastic Inflation and How Primordial Quantum Fluctuations Go Classical
C. P. Burgess; R. Holman; G. Tasinato; M. Williams
2014-11-04T23:59:59.000Z
We identify the effective theory describing inflationary super-Hubble scales and show it to be a special case of effective field theories appropriate to open systems. Open systems allow information to be exchanged between the degrees of freedom of interest and those that are integrated out, such as for particles moving through a fluid. Strictly speaking they cannot in general be described by an effective lagrangian; rather the appropriate `low-energy' limit is instead a Lindblad equation describing the evolution of the density matrix of the slow degrees of freedom. We derive the equation relevant to super-Hubble modes of quantum fields in near-de Sitter spacetimes and derive two implications. We show the evolution of the diagonal density-matrix elements quickly approaches the Fokker-Planck equation of Starobinsky's stochastic inflationary picture. This provides an alternative first-principles derivation of this picture's stochastic noise and drift, as well as its leading corrections. (An application computes the noise for systems with a sub-luminal sound speed.) We argue that the presence of interactions drives the off-diagonal density-matrix elements to zero in the field basis. This shows why the field basis is the `pointer basis' for the decoherence of primordial quantum fluctuations while they are outside the horizon, thus allowing them to re-enter as classical fluctuations, as assumed when analyzing CMB data. The decoherence process is efficient, occurring after several Hubble times even for interactions as weak as gravitational-strength. Crucially, the details of the interactions largely control only the decoherence time and not the nature of the final late-time stochastic state, much as interactions can control the equilibration time for thermal systems but are largely irrelevant to the properties of the resulting equilibrium state.
Dynamics of similar populations Geza Meszena1
Meszéna, Géza
Dynamics of similar populations G´eza Mesz´ena1 , Mats Gyllenberg2 , Frans J. Jacobs3 , Hans A. J. Metz3,4 1 E¨otv¨os Univerity, Budapest 2 University of Helsinki 3 Leiden University 4 Adaptive Dynamics by population dynamics: dni dt = ri (n1, n2, . . . , nL) ni i = 1, 2, . . . , L ni 0 for losers. Dynamics
Horizon Mechanics and Asymptotic Symmetries with a Immirzi-like Parameter in 2+1 Dimensions
Rudranil Basu; Ayan Chatterjee
2011-04-06T23:59:59.000Z
Starting with a generalized theory of 2+1 gravity containing an Immirzi like parameter, we derive the modified laws of black hole mechanics using the formalism of weak isolated horizons. Definitions of horizon mass and angular momentum emerge naturally in this framework. We further go on to analyze the asymptotic symmetries, as first discussed by Brown and Henneaux, and analyze their implications in a completely covariant phase space framework.
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
photovoltaics for integeration with the electric power systems.photovoltaic systems. Progress In Photovoltaics, 16(3):241–
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
Solar irradiance data . . . . . . . . . . . . .Accuracy . . . . . . . . . . . . . . . . . Solar Resourcev Uncertainty In Solar Resource: Forecasting
Turnpike sets in stochastic manufacturing systems with finite time horizon \\Lambda
manuÂ facturing systems. The main objective is to minimize an expected discounted cost of inventories the production plans be to meet a given fixed demand rate at the minimum cost of inventories and backlogs? A new the total inventory and backlog costs. In these two production planing problems, by taking the difference
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
Solar Irradiance And Power Output Variability In November 2009, UC Merced deployed a SunPower PV system provided with single axis tracking
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
119 Battery Storage System Applied To Mitigate Large Pvis performed for a battery storage system to mitigate the PVenergy customers. Battery Storage System Applied To Mitigate
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
in bulk, which is why many solar companies and utilities aresolar farms. Today it is widely acknowledged by power producers, utility companies and
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
119 Battery Storage System Applied To Mitigate Large Pvgenerated and battery power and actual PV power output for agenerated and battery power and actual PV power output for a
Valuing modular nuclear power plants in finite time decision horizon Shashi Jain a,b,
Oosterlee, Cornelis W. "Kees"
into account the value of flexibility arising due to modular construction, which traditional valuation methods
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01T23:59:59.000Z
114 Solar Irradiance And Power Output Variabilitytechniques for solar power output with no exogenous inputs.and their effect on solar power output. For large scale
Thermal Conductivity of the Potential Repository Horizon Model Report
J. Ramsey
2002-08-29T23:59:59.000Z
The purpose of this report is to assess the spatial variability and uncertainty of thermal conductivity in the host horizon for the proposed repository at Yucca Mountain. More specifically, the lithostratigraphic units studied are located within the Topopah Spring Tuff (Tpt) and consist of the upper lithophysal zone (Tptpul), the middle nonlithophysal zone (Tptpmn), the lower lithophysal zone (Tptpll), and the lower nonlithophysal zone (Tptpln). The Tptpul is the layer directly above the repository host layers, which consist of the Tptpmn, Tptpll, and the Tptpln. Current design plans indicate that the largest portion of the repository will be excavated in the Tptpll (Board et al. 2002 [157756]). The main distinguishing characteristic among the lithophysal and nonlithophysal units is the percentage of large scale (cm-m) voids within the rock. The Tptpul and Tptpll, as their names suggest, have a higher percentage of lithophysae than the Tptpmn and the Tptpln. Understanding the influence of the lithophysae is of great importance to understanding bulk thermal conductivity and perhaps repository system performance as well. To assess the spatial variability and uncertainty of thermal conductivity, a model is proposed that is functionally dependent on the volume fraction of lithophysae and the thermal conductivity of the matrix portion of the rock. In this model, void space characterized as lithophysae is assumed to be air-saturated under all conditions, while void space characterized as matrix may be either water- or air-saturated. Lithophysae are assumed to be air-saturated under all conditions since the units being studied are all located above the water table in the region of interest, and the relatively strong capillary forces of the matrix will, under most conditions, preferentially retain any moisture present in the rock.
Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
Sheperd Doeleman; Jonathan Weintroub; Alan E. E. Rogers; Richard Plambeck; Robert Freund; Remo P. J. Tilanus; Per Friberg; Lucy M. Ziurys; James M. Moran; Brian Corey; Ken H. Young; Daniel L. Smythe; Michael Titus; Daniel P. Marrone; Roger J. Cappallo; Douglas C. J. Bock; Geoffrey C. Bower; Richard Chamberlin; Gary R. Davis; Thomas P. Krichbaum; James Lamb; Holly Maness; Arthur E. Niell; Alan Roy; Peter Strittmatter; Daniel Werthimer; Alan R. Whitney; David Woody
2008-09-15T23:59:59.000Z
The cores of most galaxies are thought to harbour supermassive black holes, which power galactic nuclei by converting the gravitational energy of accreting matter into radiation (ref 1). Sagittarius A*, the compact source of radio, infrared and X-ray emission at the centre of the Milky Way, is the closest example of this phenomenon, with an estimated black hole mass that is 4 million times that of the Sun (refs. 2,3). A long-standing astronomical goal is to resolve structures in the innermost accretion flow surrounding Sgr A* where strong gravitational fields will distort the appearance of radiation emitted near the black hole. Radio observations at wavelengths of 3.5 mm and 7 mm have detected intrinsic structure in Sgr A*, but the spatial resolution of observations at these wavelengths is limited by interstellar scattering (refs. 4-7). Here we report observations at a wavelength of 1.3 mm that set a size of 37 (+16, -10; 3-sigma) microarcseconds on the intrinsic diameter of Sgr A*. This is less than the expected apparent size of the event horizon of the presumed black hole, suggesting that the bulk of SgrA* emission may not be not centred on the black hole, but arises in the surrounding accretion flow.
Improved Fast Similarity Search in Dictionaries
Karch, Daniel; Sanders, Peter
2010-01-01T23:59:59.000Z
We engineer an algorithm to solve the approximate dictionary matching problem. Given a list of words $\\mathcal{W}$, maximum distance $d$ fixed at preprocessing time and a query word $q$, we would like to retrieve all words from $\\mathcal{W}$ that can be transformed into $q$ with $d$ or less edit operations. We present data structures that support fault tolerant queries by generating an index. On top of that, we present a generalization of the method that eases memory consumption and preprocessing time significantly. At the same time, running times of queries are virtually unaffected. We are able to match in lists of hundreds of thousands of words and beyond within microseconds for reasonable distances.
Self-similar impulsive capillary waves on a ligament
Duchemin, Laurent; Vincent, Lionel; Villermaux, Emmanuel
2015-01-01T23:59:59.000Z
We study the short-time dynamics of a liquid ligament, held between two solid cylinders, when one is impulsively accelerated along its axis. A set of one-dimensional equations in the slender-slope approximation is used to describe the dynamics, including surface tension and viscous effects. An exact self-similar solution to the linearized equations is successfully compared to experiments made with millimetric ligaments. Another non-linear self-similar solution of the full set of equations is found numerically. Both the linear and non-linear solutions show that the axial depth at which the liquid is affected by the motion of the cylinder scales like $\\sqrt{t}$. The non-linear solution presents the peculiar feature that there exists a maximum driving velocity $U^\\star$ above which the solution disappears, a phenomenon probably related to the de-pinning of the contact line observed in experiments for large pulling velocities.
Monetary Policy, Nominal Interest Rates, and Long-horizon Inflation Uncertainty
Wright, Stephen M
2004-06-16T23:59:59.000Z
of the countries examined in this paper (the United2 Kingdom and Canada) and only in the latter part of the historical period I examine. seem clear that the nature of the market imperfections will affect the nature of the objective. Price, and possibly inflation... at similar times in the early and late 1970s, and downward shocks in the mid-1980s. This is of course unsurprising given what we know about the history of oil and other commodity prices. (iii) Whilst the impulses were similar in all countries, the responses...
A Fast Moving Horizon Estimation Algorithm Based on Nonlinear ...
2008-02-19T23:59:59.000Z
dynamic system with long time delays due to the recycle loops and multiple compression stages. The only available ... hyper-compressor. The objective is to
Anyonic statistics and large horizon diffeomorphisms for Loop Quantum Gravity Black Holes
Andreas G. A. Pithis; Hans-Christian Ruiz Euler
2015-03-24T23:59:59.000Z
We investigate the role played by large diffeomorphisms of quantum Isolated Horizons for the statistics of LQG Black Holes by means of their relation to the braid group. To this aim the symmetries of Chern-Simons theory are recapitulated with particular regard to the aforementioned type of diffeomorphisms. For the punctured spherical horizon, these are elements of the mapping class group of $S^2$, which is almost isomorphic to a corresponding braid group on this particular manifold. The mutual exchange of quantum entities in two dimensions is achieved by the braid group, rendering the statistics anyonic. With this we argue that the quantum Isolated Horizon model of LQG based on $SU(2)_k$-Chern-Simons theory explicitly exhibits non-abelian anyonic statistics. In this way a connection to the theory behind the fractional quantum Hall effect and that of topological quantum computation is established, where non-abelian anyons play a significant role.
Wave Properties of Plasma Surrounding the Event Horizon of a Non-Rotating Black Hole
M. Sharif; G. Mustafa
2008-09-09T23:59:59.000Z
We have studied the wave properties of the cold and isothermal plasma in the vicinity of the Schwarzschild black hole event horizon. The Fourier analyzed perturbed 3+1 GRMHD equations are taken on the basis of which the complex dispersion relations are obtained for non-rotating, rotating non-magnetized and rotating magnetized backgrounds. The propagation and attenuation vectors along with the refractive index are obtained (shown in graphs) to study the dispersive properties of the medium near the event horizon. The results show that no information can be obtained from the Schwarzschild magnetosphere. Further, the pressure ceases the existence of normal dispersion of waves.
Shenanigans at the black hole horizon: pair creation or Boulware accretion?
Israel, Werner
2015-01-01T23:59:59.000Z
The current scenario of black hole evaporation holds that the Hawking energy flux $F$ is powered by pair creation at the horizon. However, pair creation produces entanglements, some of which must necessarily be broken before the black hole evaporates completely. That leads to loss of information and violation of unitarity. In this paper, an alternative scenario is suggested that reproduces the essential features of Hawking evaporation, but does not invoke pair creation with its attendant problems. In this "accreting Boulware" scenario, a positive flux $F$ is still an outflux at infinity, but near the horizon it becomes an influx of negative energy. This negative energy flux (marginally) satisfies the Flanagan energy inequality.
New Horizons Science Photos from NASA's Pluto-Kuiper Belt Mission
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
DOE provided the power supply for NASA's New Horizons Mission, a mission to the Pluto and Charon, a double-planet system, and the Kuiper Belt. There are 61 science photos posted on the New Horizons website, along with mission photos, spacecraft images, launch photos, posters and renderings that are both scientific and artistic. Dates range from June of 2006 to February of 2008. The images can be searched by keywords, by date, or by subject topic. They can also be browsed as an entire list. Each image has a detailed description.
Pani, Paolo [Dipartimento di Fisica, Universita di Cagliari, and INFN sezione di Cagliari, Cittadella Universitaria 09042 Monserrato (Italy); Berti, Emanuele [Department of Physics and Astronomy, The University of Mississippi, University, Mississippi 38677-1848 (United States); Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125 (United States); Cardoso, Vitor [Department of Physics and Astronomy, The University of Mississippi, University, Mississippi 38677-1848 (United States); Centro Multidisciplinar de Astrofisica - CENTRA, Departamento de Fisica, Instituto Superior Tecnico, Av. Rovisco Pais 1, 1049-001 Lisboa (Portugal); Chen Yanbei; Norte, Richard [Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125 (United States)
2009-12-15T23:59:59.000Z
Gravitational waves from compact objects provide information about their structure, probing deep into strong-gravity regions. Here we illustrate how the presence or absence of an event horizon can produce qualitative differences in the gravitational waves emitted by ultracompact objects. In order to set up a straw-man ultracompact object with no event horizon, but which is otherwise almost identical to a black hole, we consider a nonrotating thin-shell model inspired by Mazur and Mottola's gravastar, which has a Schwarzschild exterior, a de Sitter interior and an infinitely thin shell with finite tension separating the two regions. As viewed from the external space-time, the shell can be located arbitrarily close to the Schwarzschild radius, so a gravastar might seem indistinguishable from a black hole when tests are only performed on its external metric. We study the linearized dynamics of the system, and, in particular, the junction conditions connecting internal and external gravitational perturbations. As a first application of the formalism we compute polar and axial oscillation modes of a thin-shell gravastar. We show that the quasinormal mode spectrum is completely different from that of a black hole, even in the limit when the surface redshift becomes infinite. Polar quasinormal modes depend on the equation of state of matter on the shell and can be used to distinguish between different gravastar models. Our calculations suggest that low-compactness gravastars could be unstable when the sound speed on the shell v{sub s}/c > or approx. 0.92.
Draft Horizon 2020 Work Programme 2014-2015 in the area of health, demographic change and wellbeing
Greifswald, Ernst-Moritz-Arndt-Universität
and wellbeing PART 8 - Page 2 of 96 Personalising health and care19 11 2013 Draft Horizon 2020 Work Programme 2014-2015 in the area of health, demographic change of the content of this document. #12;HORIZON 2020 WORK PROGRAMME 2014-2015 Health, demographic change
Entekhabi, Dara
PROBLEM The 2010 Deepwater Horizon (DH) oil spill in the Gulf of Mexico was unprecedented in both of Mexico during the Deepwater Horizon oil spill. This satellite image shows the oil slick off its magnitude -- nearly 5 million barrels of oil spilled over nearly three months -- and its location
Meyers, Steven D.
- 1 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling THE AMOUNT AND FATE OF THE OIL ---Draft--- Staff Working Paper No. 3 Staff Working Papers are written by the staff of the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling for the use of members
Grosell, Martin
, the 2010 Deepwater Horizon oil spill also had profound impacts on the open ocean and deep sea environmentStudy: Exposure to crude oil from the Deepwater Horizon disaster causes swimming deficiencies in juvenile mahi mahi Posted on June 12, 2014 by Bob Berwyn Evidence is mounting that BP's oil harmed millions
Giannini Foundation of Agricultural Economics New Horizons for Rural Reform in China
Kammen, Daniel M.
11 Giannini Foundation of Agricultural Economics New Horizons for Rural Reform in China: Resources a reform agenda to alleviate rural poverty and improve environmental sustainability in China. It focuses on labor reform, suggesting reductions in the work week and providing incentives aimed at encouraging exit
Receding-horizon Supervisory Control of Green Buildings Truong X. Nghiem, George J. Pappas
Pappas, George J.
.S. Department of Energy. Consequently, there has been a growing interest in green buildings, i.e., energy]). For this reason, green buildings (i.e., energy-efficient buildings) have been of strong interest not onlyReceding-horizon Supervisory Control of Green Buildings Truong X. Nghiem, George J. Pappas
Adrian Ottewill; Peter Taylor
2010-06-30T23:59:59.000Z
We obtain an analytic expression for the vacuum polarization on the horizon of the Schwarzschild black hole threaded by an infinite cosmic string. This calculation relies on a generalized Heine identity for Legendre functions which we derive without using specific properties of the Legendre functions themselves.
Dark Clouds on the Horizon: Using Cloud Storage as Attack Vector and Online Slack Space
Dark Clouds on the Horizon: Using Cloud Storage as Attack Vector and Online Slack Space Martin this as online slack space. We conclude by discussing security improvements for mod- ern online storage services protocol. With the advent of cloud computing and the shared usage of resources, these centralized storage
manipulator with a camera. The behavior of receding horizon control is almost same as inverse optimal control proposed a Lyapunov based visual feedback control with a planar manipulator [6]. Recently, the inverse cost are given by the control Lyapunov function. The inverse optimal control for the planar manipulator
Pennings, Steven C.
Disturbance and Recovery of Salt Marsh Arthropod Communities following BP Deepwater Horizon Oil of Houston, Houston, Texas, United States of America Abstract Oil spills represent a major environmental.S. Gulf of Mexico is a hub of oil and gas exploration activities that historically have impacted
A problem of hypothetical emerging of matter objects on horizon in the standard model of universe
V. Skalsky
2000-09-25T23:59:59.000Z
In the standard model of universe the increase in mass of our observed expansive Universe is explained by the assumption of emerging the matter objects on the horizon (of the most remote visibility). However, the physical analysis of the influence of this assumption on the velocity of matter objects shows unambiguously that this hypothetical assumption contradicts the theory of gravity.
WHEN GLACIERS BREAK THE ICE BETWEEN SEVERAL SCIENTIFIC HORIZONS T. Landes, P. Grussenmeyer, M. Koehl
Paris-Sud XI, Université de
WHEN GLACIERS BREAK THE ICE BETWEEN SEVERAL SCIENTIFIC HORIZONS T. Landes, P. Grussenmeyer, M temperate glacier activity. For this ambitious purpose, it was necessary to reassemble specialists coming glaciers was a unique opportunity for the MAP-PAGE team, specialized in geodetic surveying and imaging
Proof of linear instability of the Reissner-Nordström Cauchy horizon under scalar perturbations
Jonathan Luk; Sung-Jin Oh
2015-01-19T23:59:59.000Z
It has long been suggested that solutions to linear scalar wave equation $$\\Box_g\\phi=0$$ on a fixed subextremal Reissner-Nordstr\\"om spacetime with non-vanishing charge are generically singular at the Cauchy horizon. We prove that generic smooth and compactly supported initial data on a Cauchy hypersurface indeed give rise to solutions with infinite nondegenerate energy near the Cauchy horizon in the interior of the black hole. In particular, the solution generically does not belong to $W^{1,2}_{loc}$. This instability is related to the celebrated blue shift effect in the interior of the black hole. The problem is motivated by the strong cosmic censorship conjecture and it is expected that for the full nonlinear Einstein-Maxwell system, this instability leads to a singular Cauchy horizon for generic small perturbations of Reissner-Nordstr\\"om spacetime. Moreover, in addition to the instability result, we also show as a consequence of the proof that Price's law decay is generically sharp along the event horizon.
Soil animal communities in holm oak forests: influence of horizon, altitude and year
Boyer, Edmond
1 Soil animal communities in holm oak forests: influence of horizon, altitude and year Nassima-francois.ponge@wanadoo.fr Running title: Soil animals in holm oak forests hal-00498459,version1-7Jul2010 Author manuscript, published in "European Journal of Soil Biology 39, 4 (2003) 197-207" DOI : 10.1016/j.ejsobi.2003.06.001 #12
New insights into microbial responses to oil spills from the Deepwater Horizon incident
Mason, O.U.; Hazen, T.C.
2011-06-15T23:59:59.000Z
On April 20, 2010, a catastrophic eruption of methane caused the Deepwater Horizon exploratory drill rig drilling the Macondo Well in Mississippi Canyon Block 252 (MC252) to explode. The Deepwater Horizon oil spill was unprecendeted for several reasons: the volume of oil released; the spill duration; the well depth; the distance from the shore-line (77 km or about 50 miles); the type of oil (light crude); and the injection of dispersant directly at the wellhead. This study clearly demonstrated that there was a profound and significant response by certain members of the in situ microbial community in the deep-sea in the Gulf of Mexico. In particular putative hydrocarbon degrading Bacteria appeared to bloom in response to the Deepwater Horizon oil spill, even though the temperature at these depths is never >5 C. As the plume aged the shifts in the microbial community on a temporal scale suggested that different, yet metabolically important members of the community were able to respond to a myriad of plume constituents, e.g. shifting from propane/ethane to alkanes and finally to methane. Thus, the biodegradation of hydrocarbons in the plume by Bacteria was a highly significant process in the natural attenuation of many compounds released during the Deepwater Horizon oil spill.
Decay of correlations for flows with unbounded roof function, including the infinite horizon planar
Decay of correlations for flows with unbounded roof function, including the infinite horizon planar for studying nonuniformly hyperbolic flows with unbounded roof functions. In particular, we establish the decay of other classes of flows with unbounded roof functions. For geometric Lorenz attractors (in- cluding
Decay of correlations for flows with unbounded roof function, including the infinite horizon planar
Decay of correlations for flows with unbounded roof function, including the infinite horizon planar for studying nonuniformly hyperbolic flows with unbounded roof functions. In particular, we establish the decay of other classes of flows with unbounded roof functions. For geometric Lorenz attractors (in cluding
Many Task Computing for Modeling the Fate of Oil Discharged from the Deep Water Horizon Well
tons of crude oil into the Gulf of Mexico. In order to understand the fate and impact of the discharged, causing the riser pipe to rupture and crude oil to flow into the Gulf of Mexico from an approximate depthMany Task Computing for Modeling the Fate of Oil Discharged from the Deep Water Horizon Well
Characterization of Doppler Effects in the Context of Over-the-Horizon Radar
Paris-Sud XI, Université de
Characterization of Doppler Effects in the Context of Over-the-Horizon Radar Cornel Ioana Grenoble addresses the problem of the characterization of Doppler effect of maneuvering targets in the context reveals the Doppler effects characterizing the target's trajectory. Analysis of such signals
Estimating Surface Oil Extent from the Deepwater Horizon Oil Spill using ASCAT Backscatter
Long, David G.
Estimating Surface Oil Extent from the Deepwater Horizon Oil Spill using ASCAT Backscatter Richard Provo, UT 84602 Abstract--The damping effects of oil on capillary ocean waves alter the backscattered backscatter from the ocean surface uncontaminated by surface oil. Large differences between expected
Level and Degradation of Deepwater Horizon Spilled Oil in Coastal Marsh Sediments and Pore-Water
Wang, Yang
Level and Degradation of Deepwater Horizon Spilled Oil in Coastal Marsh Sediments and Pore the 2010 BP Macondo-1 well oil spill. Very high levels (10-28%) of organic carbon within the heavily oiled chromatograph spectra are in a remarkable narrow range among spilled oils and initial BP crude. At oiled sites
Introduction Zonation, the clustering of organisms into distinct horizon-
Gilman, Sarah
of climate change. Harley and Helmuth (Limnol. Oceanogr. 48:1498-1508, 2003) described a method for measuring in ecological studies as indicators of com- parable environmental conditions across locations or over time (e.g., Johannesson et al. 1995, Gilman 2005). Zonation is thought to reflect changes in patterns of emersion
Two Similarity Measure Approaches to Whole Building Fault Diagnosis
Lin, G.; Claridge, D.
2012-01-01T23:59:59.000Z
consumption in buildings using similarity measures. The method is referred to as the cosine similarity method if cosine similarity is adopted and is referred to as the Euclidean distance similarity method if Euclidean distance similarity is implemented.... Fig. 1 Block diagram for diagnosing abnormal energy consumption Step 1: Reference Control Change Library Determination Whole building fault diagnosis is different from component level fault diagnosis. It can only give a general clue, for example...
Zornberg, Jorge G.
, London, ISBN 978-0-415-45775-0 New horizons in reinforced soil technology J.G. Zornberg The University
Akiyama, Kazunori; Fish, Vincent L; Doeleman, Sheperd S; Broderick, Avery E; Dexter, Jason; Hada, Kazuhiro; Kino, Motoki; Nagai, Hiroshi; Honma, Mareki; Johnson, Michael D; Algaba, Juan C; Asada, Keiichi; Brinkerink, Christiaan; Blundell, Ray; Bower, Geoffrey C; Cappallo, Roger; Crew, Geoffrey B; Dexter, Matt; Dzib, Sergio A; Freund, Robert; Friberg, Per; Gurwell, Mark; Ho, Paul T P; Inoue, Makoto; Krichbaum, Thomas P; Loinard, Laurent; MacMahon, David; Marrone, Daniel P; Moran, James M; Nakamura, Masanori; Nagar, Neil M; Ortiz-Leon, Gisela; Plambeck, Richard; Pradel, Nicolas; Primiani, Rurik A; Rogers, Alan E E; Roy, Alan L; SooHoo, Jason; Tavares, Jonathan-Leon; Tilanus, Remo P J; Titus, Michael; Wagner, Jan; Weintroub, Jonathan; Yamaguchi, Paul; Young, Ken H; Zensus, Anton; Ziurys, Lucy M
2015-01-01T23:59:59.000Z
We report on 230 GHz (1.3 mm) VLBI observations of M87 with the Event Horizon Telescope using antennas on Mauna Kea in Hawaii, Mt. Graham in Arizona and Cedar Flat in California. For the first time, we have acquired 230 GHz VLBI interferometric phase information on M87 through measurement of closure phase on the triangle of long baselines. Most of the measured closure phases are consistent with 0$^{\\circ}$ as expected by physically-motivated models for 230 GHz structure such as jet models and accretion disk models. The brightness temperature of the event-horizon-scale structure is $\\sim 1 \\times 10^{10}$ K derived from the compact flux density of $\\sim 1$ Jy and the angular size of $\\sim 40 $ $\\rm \\mu$as $\\sim$ 5.5 $R_{{\\rm s}}$, which is broadly consistent with the peak brightness of the radio cores at 1-86 GHz located within $\\sim 10^2$ $R_{{\\rm s}}$. Our observations occurred in the middle of an enhancement in very-high-energy (VHE) $\\rm \\gamma$-ray flux, presumably originating in the vicinity of the centr...
Alternative similarity renormalization group generators in nuclear structure calculations
Nuiok M. Dicaire; Conor Omand; Petr Navratil
2014-08-22T23:59:59.000Z
The similarity renormalization group (SRG) has been successfully applied to soften interactions for ab initio nuclear calculations. In almost all practical applications in nuclear physics, an SRG generator with the kinetic energy operator is used. With this choice, a fast convergence of many-body calculations can be achieved, but at the same time substantial three-body interactions are induced even if one starts from a purely two-nucleon (NN) Hamiltonian. Three-nucleon (3N) interactions can be handled by modern many-body methods. However, it has been observed that when including initial chiral 3N forces in the Hamiltonian, the SRG transformations induce a non-negligible four-nucleon interaction that cannot be currently included in the calculations for technical reasons. Consequently, it is essential to investigate alternative SRG generators that might suppress the induction of many-body forces while at the same time might preserve the good convergence. In this work we test two alternative generators with operators of block structure in the harmonic oscillator basis. In the no-core shell model calculations for 3H, 4He and 6Li with chiral NN force, we demonstrate that their performances appear quite promising.
Lean NOx Trap Regeneration Selectivity Towards N2O -- Similarities...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Regeneration Selectivity Towards N2O -- Similarities and Differences Between H2, CO and C3H6 Reductants Lean NOx Trap Regeneration Selectivity Towards N2O -- Similarities and...
Measuring Similarity in Large-scale Folksonomies Giovanni Quattrone1
Ferrara, Emilio
Measuring Similarity in Large-scale Folksonomies Giovanni Quattrone1 , Emilio Ferrara2 , Pasquale by power law distributions of tags, over which commonly used similarity metrics, in- cluding the Jaccard to capture similarity in large-scale folksonomies, that is based on a mutual reinforcement principle: that is
Similarity Between Obesity and Drug Addiction as Assessed
Homes, Christopher C.
Similarity Between Obesity and Drug Addiction as Assessed by Neurofunctional Imaging: A Concept. Overeating in obese individuals shares similarities with the loss of control and compulsive drug taking]: "Similarity Between Obesity and Drug Addiction as Assessed by Neurofunctional Imaging: A Concept Review." Wang
TECHNICAL ADVANCE BAR expressolog identification: expression profile similarity
Toronto, University of
TECHNICAL ADVANCE BAR expressolog identification: expression profile similarity ranking with the highest sequence similarity do not necessarily exhibit the highest expression pattern similarity. Other-annotation or more specific annotation. Ultimately, it is envisaged that this pipeline will aid in improvement
Study of Yang–Mills–Chern–Simons theory in presence of the Gribov horizon
Canfora, Fabrizio, E-mail: canfora@cecs.cl [Centro de Estudios Cientificos (CECs), Valdivia (Chile); Universidad Andres Bello, Av. Republica 440, Santiago (Chile); Gomez, Arturo, E-mail: arturo.gomez@proyectos.uai.cl [Departamento de Ciencias, Facultad de Artes Liberales y Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Viña del Mar. (Chile); Sorella, Silvio Paolo, E-mail: sorella@uerj.br [UERJ, Universidade do Estado do Rio de Janeiro (UERJ), Instituto de Física Teórica, Rua São Francisco Xavier 524, 20550-013, Maracaná, Rio de Janeiro (Brazil); Vercauteren, David, E-mail: vercauteren.uerj@gmail.com [UERJ, Universidade do Estado do Rio de Janeiro (UERJ), Instituto de Física Teórica, Rua São Francisco Xavier 524, 20550-013, Maracaná, Rio de Janeiro (Brazil)
2014-06-15T23:59:59.000Z
The two-point gauge correlation function in Yang–Mills–Chern–Simons theory in three dimensional Euclidean space is analysed by taking into account the non-perturbative effects of the Gribov horizon. In this way, we are able to describe the confinement and de-confinement regimes, which naturally depend on the topological mass and on the gauge coupling constant of the theory. -- Highlights: •We implement the Gribov quantization to the Topologically massive Yang–Mills theory. •We find a modified propagator at strong coupling by the Gribov horizon. •The gauge propagator depends on the topological mass and the coupling constant. •By studying the gauge propagator we describe the confined–deconfined regimes.
Spherical collapse of a heat conducting fluid in higher dimensions without horizon
A. banerjee; S. Chatterjee
2004-06-08T23:59:59.000Z
We consider a scenario where the interior spacetime,described by a heat conducting fluid sphere is matched to a Vaidya metric in higher dimensions.Interestingly we get a class of solutions, where following heat radiation the boundary surface collapses without the appearance of an event horizon at any stage and this happens with reasonable properties of matter field.The non-occurrence of a horizon is due to the fact that the rate of mass loss exactly counterbalanced by the fall of boundary radius.Evidently this poses a counter example to the so-called cosmic censorship hypothesis.Two explicit examples of this class of solutions are also given and it is observed that the rate of collapse is delayed with the introduction of extra dimensions.The work extends to higher dimensions our previous investigation in 4D.
On the Smoothness of the Horizons of Multi-Black Hole Solutions
Dean L. Welch
1995-02-24T23:59:59.000Z
In a recent paper it was suggested that some multi-black hole solutions in five or more dimensions have horizons that are not smooth. These black hole configurations are solutions to $d$-dimensional Einstein gravity (with no dilaton) and are extremally charged with a magnetic type $(d-2)$-form. In this work these solutions will be investigated further. It will be shown that although the curvature is bounded as the horizon of one of the black holes is approached, some derivatives of the curvature are not. This shows that the metric is not $C^{\\infty },$ but rather it is only $C^k$ with $k$ finite. These solutions are static so their lack of smoothness cannot be attributed to the presence of radiation.
Vibration Testing of the Pluto/New Horizons Radioisotope Thermoelectric Generator
Charles D. Griffin
2006-06-01T23:59:59.000Z
The Radioisotopic Thermal Generator (RTG) for the Pluto/New Horizons spacecraft was subjected to a flight dynamic acceptance test to demonstrate that it would perform successfully following launch. Seven RTGs of this type had been assembled and tested at Mound, Ohio from 1984 to 1997. This paper chronicles major events in establishing a new vibration test laboratory at the Idaho National Laboratory and the nineteen days of dynamic testing.
Hawking radiation and the boomerang behavior of massive modes near a horizon
Jannes, G. [Universite de Nice Sophia Antipolis, Laboratoire J.-A. Dieudonne, UMR CNRS-UNS 6621, Parc Valrose, 06108 Nice Cedex 02 (France); Low Temperature Laboratory, Aalto University School of Science, PO Box 15100, 00076 Aalto (Finland); Maiessa, P.; Rousseaux, G. [Universite de Nice Sophia Antipolis, Laboratoire J.-A. Dieudonne, UMR CNRS-UNS 6621, Parc Valrose, 06108 Nice Cedex 02 (France); Philbin, T. G. [School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, Scotland (United Kingdom)
2011-05-15T23:59:59.000Z
We discuss the behavior of massive modes near a horizon based on a study of the dispersion relation and wave packet simulations of the Klein-Gordon equation. We point out an apparent paradox between two (in principle equivalent) pictures of black-hole evaporation through Hawking radiation. In the picture in which the evaporation is due to the emission of positive-energy modes, one immediately obtains a threshold for the emission of massive particles. In the picture in which the evaporation is due to the absorption of negative-energy modes, such a threshold apparently does not exist. We resolve this paradox by tracing the evolution of the positive-energy massive modes with an energy below the threshold. These are seen to be emitted and move away from the black-hole horizon, but they bounce back at a 'red horizon' and are reabsorbed by the black hole, thus compensating exactly for the difference between the two pictures. For astrophysical black holes, the consequences are curious but do not affect the terrestrial constraints on observing Hawking radiation. For analogue-gravity systems with massive modes, however, the consequences are crucial and rather surprising.
Chen, Xin
We analyze an infinite horizon, single product, periodic review model in which pricing and production/inventory decisions are made simultaneously. Demands in different periods are identically distributed random variables ...
Meyers, Steven D.
Deepwater Horizon Oil Spill Principal Investigator (PI) Conference Sponsored Ballroom · Oil/dispersant - extent and fate Tom Ryerson, National Oceanic and Atmospheric Administration · Oil/dispersant - impacts and mitigation in coastal
Holographic Space-time and Black Holes: Mirages As Alternate Reality
Tom Banks; Willy Fischler; Sandipan Kundu; Juan F. Pedraza
2014-01-30T23:59:59.000Z
We revisit our investigation of the claim of [1] that old black holes contain a firewall, i.e. an in-falling observer encounters highly excited states at a time much shorter than the light crossing time of the Schwarzschild radius. We used the formalism of Holographic Space-time (HST) where there is no dramatic change in particle physics inside the horizon until a time of order the Schwarzschild radius. We correct our description of the interior of the black hole . HST provides a complete description of the quantum mechanics along any time-like trajectory, even those which fall through the black hole horizon. The latter are described as alternative factorizations of the description of an external observer, turning the mirage of the interior provided by that observer's membrane paradigm on the stretched horizon, into reality.
Non-commutative Einstein-Proca Space-time
Blanca Gónzales; Román Linares; Marco Maceda; Oscar Sánchez-Santos
2014-09-12T23:59:59.000Z
In this work we present a deformed model of Einstein-Proca space-time based on the replacement of point-like sources by non-commutative smeared distributions. We discuss the solutions to the set of non-commutative Einstein-Proca equations thus obtained, with emphasis on the issue of singularities and horizons.
Hazen, Terry
5/10/10 7:22 AMTerry Hazen, Berkeley Lab: Deepwater Horizon Spill Detergents Could Make Bad Situation Worse Page 1 of 3http://www.outlookseries.com/N7/Science/3910_Terry_Hazen_Berkeley_La...water_Horizon_Spill Terry Hazen, Berkeley Lab: Deepwater Horizon Spill Detergents Could Make Bad Situation Worse May 6, 2010
aneurysms similarities differences: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
similarities and differences between d- Materials Science Websites Summary: in mind He3, organic materials. Too diverse set to cover at once. 12;CuO2 Laye...
A FUZZY SIMILARITY-BASED METHOD FOR FAILURE DETECTION AND RECOVERY TIME ESTIMATION
Paris-Sud XI, Université de
Nuclear Power Plant (NPP) accident management involves the anticipation of paths of potentially dangerous that they detect the occurrence of the accident, determine the extent of challenge to plant safety, monitor, Emergency Accident Management, Lead-Bismuth Eutectic eXperimental Accelerator Driven System (LBE
Performing local similarity searches with variable length seeds
CsÃ¼rÃ¶s, MiklÃ³s
Performing local similarity searches with variable length seeds MiklÂ´os CsurÂ¨os DÂ´epartement d manner. The algorithm uses a single parameter to control the speed of the similarity search there are many inventions that improve the speed of a full sensitivity search (e.g., [3]), a full-scale search
Self-similar expanding solutions for the planar network flow
Mazzeo, Rafe
Self-similar expanding solutions for the planar network flow Rafe Mazzeo Stanford University-similar expanding solutions of the cur- vature flow on planar networks where the initial configuration is any num generally, one might consider the flow by curvature for net- works of curves. Definition 1.1. A planar
Cross-Language High Similarity Search Using a Conceptual Thesaurus
Rosso, Paolo
Cross-Language High Similarity Search Using a Conceptual Thesaurus Parth Gupta, Alberto Barr Universitat Polit`ecnica de Val`encia, Spain {pgupta,lbarron,prosso}@dsic.upv.es http://www.dsic.upv.es/grupos/nle Abstract. This work addresses the issue of cross-language high similarity and near-duplicates search, where
Using Negative Shape Features for Logo Similarity Matching Aya Soffer
Samet, Hanan
Using Negative Shape Features for Logo Similarity Matching Aya Soffer , Hanan Samet y Computer A method for representing and matching logos based on positiveandnegative shape features ispresented. Neg. The goal is to find logos in a database that are most similar to a given sample logo. A border is added
On quantum effects in the vicinity of would-be horizons
P. Marecki
2006-12-28T23:59:59.000Z
We present a method based on the so-called Quantum Energy Inequalities, which allows to compare, and bound, the expectation values of energy-densities of ground states of quantum fields in spacetimes possessing isometric regions. The method supports the conclusion, that the Boulware energy density is universal both: at modest (and far) distances from compact spherical objects, and close to the would-be horizons of the gravastar/QBHO spacetimes. It also provides a natural consistency check for concrete (approximate, numerical) calculations of the expectation values of the energy-momentum tensors.
Microsoft Word - Horizon Wind Energy Comments.docx | Department of Energy
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33Frequently Asked Questions forCheneyNovember S.Fluor-B&W OE-781R DOE RFI on Smart GridHorizon
Self-similar Evolution of Self-Gravitating Viscous Accretion Discs
Illenseer, Tobias F
2015-01-01T23:59:59.000Z
A new one-dimensional, dynamical model is proposed for geometrically thin, self-gravitating viscous accretion discs. The vertically integrated equations are simplified using the slow accretion limit and the monopole approximation with a time-dependent central point mass to account for self-gravity and accretion. It is shown that the system of partial differential equations can be reduced to a single non-linear advection diffusion equation which describes the time evolution of angular velocity. In order to solve the equation three different turbulent viscosity prescriptions are considered. It is shown that for these parametrizations the differential equation allows for similarity transformations depending only on a single non-dimensional parameter. A detailed analysis of the similarity solutions reveals that this parameter is the initial power law exponent of the angular velocity distribution at large radii. The radial dependence of the self-similar solutions is in most cases given by broken power laws. At sma...
A wavelet-based spectral method for extracting self-similarity measures in
Katul, Gabriel
A wavelet-based spectral method for extracting self-similarity measures in time-varying two of wavelet-based spectral methods are now routinely employed to estimate Hurst exponents and other measures of regularity and scaling. In this article, an ensemble of new wavelet- based spectral tools for analysis of 2-D
Tian, David Wenjie
2014-01-01T23:59:59.000Z
The thermodynamics of the Universe is re-studied by requiring its compatibility with the holographic-style gravitational equations which govern the dynamics of both the cosmological apparent horizon and the entire Universe. We start from the Lambda Cold Dark Matter ($\\Lambda$CDM) cosmology of general relativity (GR) to establish a framework for the gravitational thermodynamics. The Clausius equation $T_AdS_A=-A_A \\psi_t$ for the isochoric process of an instantaneous apparent horizon indicates that, the Universe and its horizon entropies encode the Positive Out thermodynamic sign convention, which encourage us to adjust the traditional positive-heat-in Gibbs equation into the positive-heat-out version $dE_m=-T_mdS_m-P_mdV$. It turns out that the standard and the generalized second laws (GSLs) of nondecreasing entropies are always respected by the event-horizon system as long as the expanding Universe is dominated by nonexotic matter $-1\\leq w_m\\leq 1$, while for the apparent-horizon simple open system the two ...
Assembly and Testing of a Radioisotope Power System for the New Horizons Spacecraft
Kenneth E. Rosenberg; Stephen G. Johnson
2006-06-01T23:59:59.000Z
The Idaho National Laboratory (INL) recently fueled and assembled a radioisotope power system (RPS) that was used upon the New Horizons spacecraft which was launched in January 2006. New Horizons is the first mission to the last planet - the initial reconnaissance of Pluto-Charon and the Kuiper Belt, exploring the mysterious worlds at the edge of our solar system. The RPS otherwise known as a "space battery" converts thermal heat into electrical energy. The thermal heat source contains plutonium dioxide in the form of ceramic pellets encapsulated in iridium metal. The space battery was assembled in a new facility at the Idaho National Laboratory site near Idaho Falls, Idaho. The new facility has all the fueling and testing capabilities including the following: the ability to handle all the shipping containers currently certified to ship Pu-238, the ability to fuel a variety of RPS designs, the ability to perform vibrational testing to simulate transportation and launch environments, welding systems, a center of mass determination device, and various other support systems.
Stringy Stability of Charged Dilaton Black Holes with Flat Event Horizon
Yen Chin Ong; Pisin Chen
2014-12-29T23:59:59.000Z
Electrically charged black holes with flat event horizon in anti-de Sitter space have received much attention due to various applications in Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence, from modeling the behavior of quark-gluon plasma to superconductor. Crucial to the physics on the dual field theory is the fact that when embedded in string theory, black holes in the bulk may become vulnerable to instability caused by brane pair-production. Since dilaton arises naturally in the context of string theory, we study the effect of coupling dilaton to Maxwell field on the stability of flat charged AdS black holes. In particular, we study the stability of Gao-Zhang black holes, which are locally asymptotically anti-de Sitter. We find that for dilaton coupling parameter $\\alpha$ > 1, flat black holes are stable against brane pair production, however for 0 electrical charges is increased. Such instability however, behaves somewhat differently from that of flat Reissner-Nordstr\\"om black holes. In addition, we prove that the Seiberg-Witten action of charged dilaton AdS black hole of Gao-Zhang type with flat event horizon (at least in 5-dimension) is always logarithmically divergent at infinity for finite values of $\\alpha$, and is finite and positive in the case $\\alpha$ tends to infinity . We also comment on the robustness of our result for other charged dilaton black holes that are not of Gao-Zhang type.
Hagedorn String Thermodynamics in Curved Spacetimes and near Black Hole Horizons
Thomas G. Mertens
2015-06-25T23:59:59.000Z
This thesis concerns the study of high-temperature string theory on curved backgrounds, generalizing the notions of Hagedorn temperature and thermal scalar to general backgrounds. Chapter 2 contains a review on string thermodynamics in flat space, setting the stage. Chapters 3 and 4 contain the detailed study of the random walk picture in a general curved background. Chapters 5 and 6 then apply this to Rindler space, the near-horizon approximation of a generic (uncharged) black hole. Chapters 7 and 8 contain a study of the AdS3 and BTZ WZW models where we study the thermal spectrum and the resulting random walk picture that emerges. Chapters 9 and 10 attempt to draw general conclusions from the study of the two specific examples earlier: we draw lessons on string thermodynamics in general and on (perturbative) string thermodynamics around black hole horizons. For the latter, we point out a possible link to the firewall paradox. Finally, chapter 11 contains a detailed discussion on the near-Hagedorn (and high-energy) stress tensor in a generic spacetime, the results of which are applied to provide a description of the Bekenstein-Hawking entropy in terms of long string equilibration.
Visual Similarity Effects in Categorical Search Robert G. Alexander1
Zelinsky, Greg
Visual Similarity Effects in Categorical Search Robert G. Alexander1 (rgalexander Microsoft Corporation Abstract The factors affecting search guidance to categorical targets are largely classes, teddy bears and butterflies, affects search guidance. Experiment 1 used a web-based task
Iridates and cuprate superconductors: the similarities are more...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Iridates and cuprate superconductors: the similarities are more than skin deep July 11, 2014 Tweet EmailPrint Researchers at the U.S. Department of Energy's Argonne National...
Catholic University of Chile (Universidad Católica de Chile)
pioneered the Clean Air Act (CAA) in 1963 which established a criteria pollutants list considered dangerous and the Netherlands are among the most advanced countries in relation to environmental pollution control. USA in 1970 to set the uniform national standards for air quality, to create the Environmental Protection
Park, Yeonjeong; Harmon, Thomas C
2009-01-01T23:59:59.000Z
water content, residual water content, an empirical moistureand rinsed with deionized water to remove residual salts.residual salt concentrations were found to be negligible compared to the salt loading in the irrigation water,
Upper bound for entropy in asymptotically de Sitter space-time
Kengo Maeda; Tatsuhiko Koike; Makoto Narita; Akihiro Ishibashi
1997-12-05T23:59:59.000Z
We investigate nature of asymptotically de Sitter space-times containing a black hole. We show that if the matter fields satisfy the dominant energy condition and the cosmic censorship holds in the considering space-time, the area of the cosmological event horizon for an observer approaching a future timelike infinity does not decrease, i.e. the second law is satisfied. We also show under the same conditions that the total area of the black hole and the cosmological event horizon, a quarter of which is the total Bekenstein-Hawking entropy, is less than $12\\pi/\\Lambda$, where $\\Lambda$ is a cosmological constant. Physical implications are also discussed.
Quantitative similarity analysis of small-break loss-of-coolant accident scenarios
Prosek, A.; Kljenak, I.; Mavko, B. [Univ. of Ljubljana (Slovenia). Jozef Stefan Inst.
1996-07-01T23:59:59.000Z
Classifications of small-break loss-of-coolant accidents based on objective quantitative similarity analysis are proposed. Accident scenarios were simulated in a two-loop pressurized water reactor plant with the RELAP5/MOD3.1 computer code for break sizes ranging from 1.27 cm (0.5 in.) to 15.2 cm (6 in.), with different availability of auxiliary feedwater system or reactor coolant pump trip delay. Similarities between different accident simulations were evaluated by comparing relevant time-dependent parameters with fast Fourier transform and correlation methods. Quantification of similarity between accident simulations could eventually lead to further development of the Code Scaling, Applicability and Uncertainty methodology.
Microbial gene functions enriched in the Deepwater Horizon deep-sea oil plume
Lu, Z.; Deng, Y.; Nostrand, J.D. Van; He, Z.; Voordeckers, J.; Zhou, A.; Lee, Y.-J.; Mason, O.U.; Dubinsky, E.; Chavarria, K.; Tom, L.; Fortney, J.; Lamendella, R.; Jansson, J.K.; D?haeseleer, P.; Hazen, T.C.; Zhou, J.
2011-06-15T23:59:59.000Z
The Deepwater Horizon oil spill in the Gulf of Mexico is the deepest and largest offshore spill in U.S. history and its impacts on marine ecosystems are largely unknown. Here, we showed that the microbial community functional composition and structure were dramatically altered in a deep-sea oil plume resulting from the spill. A variety of metabolic genes involved in both aerobic and anaerobic hydrocarbon degradation were highly enriched in the plume compared to outside the plume, indicating a great potential for intrinsic bioremediation or natural attenuation in the deep-sea. Various other microbial functional genes relevant to carbon, nitrogen, phosphorus, sulfur and iron cycling, metal resistance, and bacteriophage replication were also enriched in the plume. Together, these results suggest that the indigenous marine microbial communities could play a significant role in biodegradation of oil spills in deep-sea environments.
Dahlqvist, P. [Royal Inst. of Technology, Stockholm (Sweden)
1996-08-01T23:59:59.000Z
We compute the Lyapunov exponent, the generalized Lyapunov exponents, and the diffusion constant for a Lorentz gas on a square lattice, thus having infinite horizon. Approximate zeta functions, written in terms of probabilities rather than periodic orbits, are used in order to avoid the convergence problems of cycle expansions. The emphasis is on the relaxation between the analytic structure of the zeta function, where a branch cut plays an important role, and the asymptotic dynamics of the system. The Lyapunov exponent for the corresponding map agrees with the conjectured limit {lambda}{sub map}=-2 log(R) + C + O(R) and we derive an approximate value for the constant C in good agreement with numerical simulations. We also find a diverging diffusion constant D(t){approx}log t and a phase transition for the generalized Lyapunov exponents.
Minireview 501 Kinesin and myosin: molecular motors with similar engines
Rayment, Ivan
Minireview 501 Kinesin and myosin: molecular motors with similar engines Ivan Rayment Structure molecu- lar motors that fulfill many of these tasks. These fall into three general classes of molecular motor exhibits the same architecture as myosin and suggests that these microtubule- and actin
Similarity measure to identify users' profiles in web usage mining
Paris-Sud XI, Université de
Similarity measure to identify users' profiles in web usage mining Firas Abou Latif -- Nicolas information. It makes the website browsing process even harder. This paper addresses the web usage mining problématique ré- currente. Le Web Usage Mining, qui tente de résoudre ce problème, propose des techniques
Atmospheric CO2 concentrations during ancient greenhouse climates were similar
Ahmad, Sajjad
Atmospheric CO2 concentrations during ancient greenhouse climates were similar to those predicted atmospheric CO2 concentrations (½CO2atm) during Earth's ancient greenhouse episodes is essential for accurately predicting the response of future climate to elevated CO2 levels. Empirical estimates of ½CO2atm
Introduction Speech and non-speech exhibit similar spectrally contrastive
Holt, Lori L.
in 3 noise conditions Perception of coarticulated speech with contrastively enhanced spectrotemporal Conclusions General, non-speech-specific contrast enhancement can benefit recognition of coarticulated speechIntroduction Speech and non-speech exhibit similar spectrally contrastive context effects on speech
ISOVECTOR FIELDS AND SIMILARITY SOLUTIONS FOR 1-D LINEAR POROELASTICITY
)). Let {x1 , x2 , ..., xn } be a coordinate cover of the vector space En. The exterior algebra (En real-valued C functions on En and k (En), 1 k n is the vector space of all exterior forms of degree k poroelasticity is calculated in this paper by using exterior calculus. Similarity solutions for some special
Similarities and Differences in Genome-Wide Expression Data
Barkai, Naama
Ihmels, Naama Barkai* Departments of Molecular Genetics and Physics of Complex Systems, Weizmann profiles are similar, we find that for all organisms the connectivity distribution follows a power. We reveal the modular structure by decomposing each set of expression data into coexpressed modules
Analyzing Parallelism and Domain Similarities in the MAREC Patent Corpus
Riezler, Stefan
Analyzing Parallelism and Domain Similarities in the MAREC Patent Corpus Katharina W}@cl.uni-heidelberg.de Abstract. Statistical machine translation of patents requires large a- mounts of sentence-parallel data. Translations of patent text often exist for parts of the patent document, namely title, abstract and claims
Flexible sequence similarity searching with the FASTA3 program package
Humphrey, Marty
1 Flexible sequence similarity searching with the FASTA3 program package William R. Pearson questions, such as: "Which FASTA program should I use?", "What threshold should I use for statistical, fasty3, tfastx3, and tfasty3, and the program for estimating statistical significance from shuffled
Self-similar and charged spheres in the diffusion approximation
W. Barreto; A. Da Silva
2005-08-12T23:59:59.000Z
We study spherical, charged and self--similar distributions of matter in the diffusion approximation. We propose a simple, dynamic but physically meaningful solution. For such a solution we obtain a model in which the distribution becomes static and changes to dust. The collapse is halted with damped mass oscillations about the absolute value of the total charge.
Greifswald, Ernst-Moritz-Arndt-UniversitÃ¤t
agriculture and forestry, marine and maritime and inland water research and the bioeconomy Important notice of this document. #12;HORIZON 2020 Â WORK PROGRAMME 2014-2015 Food security, sustainable agriculture and forestry ..................... 14 SFS-7-2014/2015: Genetic resources and agricultural diversity for food security, productivity
Adrian C. Ottewill; Peter Taylor
2010-10-19T23:59:59.000Z
We calculate the renormalized vacuum polarization and stress tensor for a massless, arbitrarily coupled scalar field in the Hartle-Hawking vacuum state on the horizon of a Schwarzschild black hole threaded by an infinte straight cosmic string. This calculation relies on a generalized Heine identity for non-integer Legendre functions which we derive without using specific properties of the Legendre functions themselves.
Adaptive Receding Horizon Control of Tubular Bioreactors J.M. Igreja, J. M. Lemos and R. N. Silva
Sontag, Eduardo
Adaptive Receding Horizon Control of Tubular Bioreactors J.M. Igreja, J. M. Lemos and R. N. Silva algorithm to tubular bioreactors. According to the control strategy proposed, the system of PDEs describing bioreactors. The approach followed consists in approximating the hyperbolic PDE describing the plant
Paris-Sud XI, Université de
A knowledge-based approach of seismic interpretation : horizon and dip-fault detection by means presents preliminary results obtained through a new seismic interpretation methodology based on cognitive building process. The efforts currently made to improve seismic interpretation are mainly focused
Load Reduction of Wind Turbines Using Receding Horizon Control Mohsen Soltani, Rafael Wisniewski, Per Brath, and Stephen Boyd Abstract-- Large scale wind turbines are lightly damped mechanical% respectively, when compared to a conventional controller. I. INTRODUCTION The size of wind turbine structures
Boyer, Edmond
heavy-tailed and light-tailed claim amount distributions are investigated. The time horizon may theory, heavy-tailed and light-tailed claim size distribution, risk measure, optimal reserve allocation. 1. Introduction The current change of regulation leads the insurance industry to address new
David Wenjie Tian; Ivan Booth
2015-01-22T23:59:59.000Z
Thermodynamics of the Universe is restudied by requiring its compatibility with the holographic-style gravitational equations which govern the dynamics of both the cosmological apparent horizon and the entire Universe. We start from the Lambda Cold Dark Matter ($\\Lambda$CDM) cosmology of general relativity (GR) to establish a framework for the gravitational thermodynamics. The Cai-Kim Clausius equation $T_{\\text{A}}dS_{\\text{A}}=-dE_{\\text{A}}=-A_{\\text{A}} \\psi_t$ for the isochoric process of an instantaneous apparent horizon indicates that, the Universe and its horizon entropies encode the Positive Out thermodynamic sign convention, which encourage us to adjust the traditional positive-heat-in Gibbs equation into the positive-heat-out version $dE_m=-T_mdS_m-P_mdV$. It turns out that the standard and the generalized second laws (GSLs) of nondecreasing entropies are always respected by the event-horizon system as long as the expanding Universe is dominated by nonexotic matter $-1\\leq w_m\\leq 1$, while for the apparent-horizon simple open system the two second laws hold if $-1\\leq w_martificial local equilibrium assumption is abandoned in the GSL. All constraints regarding entropy evolution are expressed by the equation of state parameters, which show that from a thermodynamic perspective the phantom dark energy is less favored than the cosmological constant and the quintessence. Finally, the whole framework is extended from GR and $\\Lambda$CDM to modified gravities with field equations $R_{\\mu\
Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics
Kabir, Mashud
2009-01-01T23:59:59.000Z
Fault diagnosis has become a very important area of research during the last decade due to the advancement of mechanical and electrical systems in industries. The automobile is a crucial field where fault diagnosis is given a special attention. Due to the increasing complexity and newly added features in vehicles, a comprehensive study has to be performed in order to achieve an appropriate diagnosis model. A diagnosis system is capable of identifying the faults of a system by investigating the observable effects (or symptoms). The system categorizes the fault into a diagnosis class and identifies a probable cause based on the supplied fault symptoms. Fault categorization and identification are done using similarity matching techniques. The development of diagnosis classes is done by making use of previous experience, knowledge or information within an application area. The necessary information used may come from several sources of knowledge, such as from system analysis. In this paper similarity matching tec...
Self-similar solitary wave family in Bessel lattice
Cai Zebin [Department of Physics, Huazhong University of Science and Technology, Wuhan (430074) (China); Department of Basis, Air Force Radar Academy, Wuhan (430019) (China); Liang Jianchu [Department of Electric Science, College of Huizhou, Guangdong (510006) (China); Xia Xiongping; Jin Haiqin; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan (430074) (China); Jiang Yue [Department of Basis, Air Force Radar Academy, Wuhan (430019) (China)
2011-05-15T23:59:59.000Z
We focus on the formation and propagation of self-similar solitary wave family in Kerr nonlinear media with external Bessel lattice. A novel analytical solitary wave solution to (3+1)-dimensional Gross-Pitaevskii equation with varying coefficients and an external potential is obtained. The components of solitary wave family are differentiated by three quantum parameters. The properties and the stability of the solitary wave family are discussed in detail.
Refined similarity hypotheses in shell models of turbulence
Emily S. C. Ching; H. Guo; T. S. Lo
2008-04-16T23:59:59.000Z
A major challenge in turbulence research is to understand from first principles the origin of anomalous scaling of the velocity fluctuations in high-Reynolds-number turbulent flows. One important idea was proposed by Kolmogorov [J. Fluid Mech. {\\bf 13}, 82 (1962)], which attributes the anomaly to the variations of the locally averaged energy dissipation rate. Kraichnan later pointed out [J. Fluid Mech. {\\bf 62}, 305 (1973)] that the locally averaged energy dissipation rate is not an inertial-range quantity and a proper inertial-range quantity would be the local energy transfer rate. As a result, Kraichnan's idea attributes the anomaly to the variations of the local energy transfer rate. These ideas, generally known as refined similarity hypotheses, can also be extended to study the anomalous scaling of fluctuations of an active scalar, like the temperature in turbulent convection. In this paper, we examine the validity of these refined similarity hypotheses and their extensions to an active scalar in shell models of turbulence. We find that Kraichnan's refined similarity hypothesis and its extension are valid.
On the Quantum Stability of the Time Machine
S. V. Krasnikov
1995-08-16T23:59:59.000Z
In a number of papers it has been claimed that the time machine are quantum unstable, which manifests itself in the divergence of the vacuum expectation value of the stress-energy tensor $\\langle{\\bf T}\\rangle$ near the Cauchy horizon. The expression for $\\langle{\\bf T}\\rangle$ was found in these papers on the basis of some specific approach \\cite{Fro,KimT}.\\par We show that this approach is untenable in that the above expression firstly is not derived from some more fundamental and undeniable premises, as it is claimed, but rather postulated and secondly contains undefined terms, so that one can neither use nor check it. As a counterexample we cite a few cases of (two-dimensional) spacetimes containing time machines with $\\langle{\\bf T}\\rangle$ bounded near the Cauchy horizon.
Time lapse seismic signal analysis for Cranfield, MS, EOR and CCS site Ditkof, J.1
Texas at Austin, University of
-delay along a horizon below the reservoir. Keywords: time lapse, 4D seismic, CO2 sequestration, EOR, seismic under continuous CO2 injection by Denbury Onshore LLC since 2008. To date, more than 3 million tons of CO2 remain in the subsurface. In 2007 and 2010, 3D seismic surveys were shot and an initial 4D
Shortfall risk minimization in discrete time financial market models Noufel Frikha
Paris-Sud XI, Université de
. In a Markovian framework, we propose and analyze several algorithms based on Monte Carlo simulations to estimate by using a self-financing strategy on finite horizon time. The unique cost of replication is the expected which requires a large amount of initial capital. However, this approach is known to take into account
On the similarity of Information Energy to Dark Energy
M. P. Gough; T. D. Carozzi; A. M. Buckley
2006-06-19T23:59:59.000Z
Information energy is shown here to have properties similar to those of dark energy. The energy associated with each information bit of the universe is found to be defined identically to the characteristic energy of a cosmological constant. Two independent methods are used to estimate the universe information content of ~10^91 bits, a value that provides an information energy total comparable to that of the dark energy. Information energy is also found to have a significantly negative equation of state parameter, w energy.
Metre, P.C. van; Wilson, J.T. [Geological Survey, Austin, TX (United States)] [Geological Survey, Austin, TX (United States); Callender, E. [Geological Survey, Reston, VA (United States)] [Geological Survey, Reston, VA (United States); Fuller, C.C. [Geological Survey, Menlo Park, CA (United States)] [Geological Survey, Menlo Park, CA (United States)
1998-11-01T23:59:59.000Z
Although it is well-known that concentrations of anthropogenic radionuclides and organochlorine compounds in aquatic systems have decreased since their widespread release has stopped in the United States, the magnitude and variability of rates of decrease are not well-known. Paleolimnological studies of reservoirs provide a tool for evaluating these long-term trends in riverine systems. Rates of decrease from the 1960s to the 1990s of {sup 137}Cs, PCBs, and total DDT in dated sediment cores from 11 reservoirs in the eastern and central United States were modeled using first-order rate models. Mean half-times of 10.0 ({+-}2.5), 9.5 ({+-}2.2), and 13 ({+-}5.8) yr for decay-corrected {sup 137}Cs, PCBs, and total DDT, respectively, are surprisingly similar. Similar rates of decrease in a few reservoirs are also demonstrated for chlordane and lead. Conceptual and simple mathematical models relating two soil distributions of {sup 137}Cs to trends in the cores provide insight into differences in trends between watersheds with different land uses and suggest that trends are controlled by erosion, transport, mixing, and deposition of sediments. These results, supported by similar trends reported for other settings and environmental media, could provide an estimate of the decadal response time of riverine systems to changes in the regulation of other persistent hydrophobic or particle-reactive contaminants.
DETECTION OF THE COSMIC {gamma}-RAY HORIZON FROM MULTIWAVELENGTH OBSERVATIONS OF BLAZARS
Dominguez, A.; Siana, B. [Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States); Finke, J. D. [U.S. Naval Research Laboratory, Space Science Division, Code 7653, 4555 Overlook Avenue SW, Washington, DC 20375 (United States); Prada, F. [Campus of International Excellence UAM-CSIC, Cantoblanco, E-28049 Madrid (Spain); Primack, J. R. [Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Kitaura, F. S. [Leibniz-Institut fuer Astrophysik (AIP), An der Sternwarte 16, D-14482 Potsdam (Germany); Paneque, D., E-mail: albertod@ucr.edu [Kavli Institute for Particle Astrophysics and Cosmology, SLAC, Stanford University, Stanford, CA 94305 (United States)
2013-06-10T23:59:59.000Z
The first statistically significant detection of the cosmic {gamma}-ray horizon (CGRH) that is independent of any extragalactic background light (EBL) model is presented. The CGRH is a fundamental quantity in cosmology. It gives an estimate of the opacity of the universe to very high energy (VHE) {gamma}-ray photons due to photon-photon pair production with the EBL. The only estimations of the CGRH to date are predictions from EBL models and lower limits from {gamma}-ray observations of cosmological blazars and {gamma}-ray bursts. Here, we present homogeneous synchrotron/synchrotron self-Compton (SSC) models of the spectral energy distributions of 15 blazars based on (almost) simultaneous observations from radio up to the highest energy {gamma}-rays taken with the Fermi satellite. These synchrotron/SSC models predict the unattenuated VHE fluxes, which are compared with the observations by imaging atmospheric Cherenkov telescopes. This comparison provides an estimate of the optical depth of the EBL, which allows us a derivation of the CGRH through a maximum likelihood analysis that is EBL-model independent. We find that the observed CGRH is compatible with the current knowledge of the EBL.
Detection of the Cosmic ?-Ray Horizon From Multiwavelength Observations of Blazars
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Dominguez, A.; Finke, J. D.; Prada, F.; Primack, J. R.; Kitaura, F. S.; Siana, B.; Paneque, D.
2013-05-24T23:59:59.000Z
The first statistically significant detection of the cosmic ?-ray horizon (CGRH) that is independent of any extragalactic background light (EBL) model is presented. The CGRH is a fundamental quantity in cosmology. It gives an estimate of the opacity of the Universe to very high energy (VHE) ?-ray photons due to photon-photon pair production with the EBL. The only estimations of the CGRH to date are predictions from EBL models and lower limits from ?-ray observations of cosmological blazars and ?-ray bursts. Here, we present homogeneous synchrotron/synchrotron self-Compton (SSC) models of the spectral energy distributions of 15 blazars based on (almost) simultaneous observations from radio up to the highest energy ?-rays taken with the Fermi satellite. These synchrotron/SSC models predict the unattenuated VHE fluxes, which are compared with the observations by imaging atmospheric Cherenkov telescopes. This comparison provides an estimate of the optical depth of the EBL, which allows a derivation of the CGRH through a maximum likelihood analysis that is EBL-model independent. We find that the observed CGRH is compatible with the current knowledge of the EBL.
X-RAY TRANSIENTS IN THE ADVANCED LIGO/VIRGO HORIZON
Kanner, Jonah [LIGO-California Institute of Technology, Pasadena, CA 91125 (United States); Baker, John; Blackburn, Lindy; Camp, Jordan [NASA Goddard Space Flight Center, Mail Code 663, Greenbelt, MD 20771 (United States); Mooley, Kunal [California Institute of Technology, Astronomy Department, Mail Code 249-17, Pasadena, CA 91125 (United States); Mushotzky, Richard; Ptak, Andy, E-mail: jonah.kanner@ligo.org [NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States)
2013-09-01T23:59:59.000Z
Advanced LIGO and Advanced Virgo will be all-sky monitors for merging compact objects within a few hundred megaparsecs. Finding the electromagnetic counterparts to these events will require an understanding of the transient sky at low redshift (z < 0.1). We performed a systematic search for extragalactic, low redshift, transient events in the XMM-Newton Slew Survey. In a flux limited sample, we found that highly variable objects comprised 10% of the sample, and that of these, 10% were spatially coincident with cataloged optical galaxies. This led to 4 Multiplication-Sign 10{sup -4} transients per square degree above a flux threshold of 3 Multiplication-Sign 10{sup -12} erg cm{sup -2} s{sup -1} (0.2-2 keV) which might be confused with LIGO/Virgo counterparts. This represents the first extragalactic measurement of the soft X-ray transient rate within the Advanced LIGO/Virgo horizon. Our search revealed six objects that were spatially coincident with previously cataloged galaxies, lacked evidence for optical active galactic nuclei, displayed high luminosities {approx}10{sup 43} erg s{sup -1}, and varied in flux by more than a factor of 10 when compared with the ROSAT All-Sky Survey. At least four of these displayed properties consistent with previously observed tidal disruption events.
Clustering of quintessence on horizon scales and its imprint on HI intensity mapping
Duniya, Didam G.A.; Bertacca, Daniele; Maartens, Roy, E-mail: adamsgwazah@gmail.com, E-mail: daniele.bertacca@gmail.com, E-mail: roy.maartens@gmail.com [Physics Department, University of the Western Cape, Cape Town 7535 (South Africa)
2013-10-01T23:59:59.000Z
Quintessence can cluster only on horizon scales. What is the effect on the observed matter distribution? To answer this, we need a relativistic approach that goes beyond the standard Newtonian calculation and deals properly with large scales. Such an approach has recently been developed for the case when dark energy is vacuum energy, which does not cluster at all. We extend this relativistic analysis to deal with dynamical dark energy. Using three quintessence potentials as examples, we compute the angular power spectrum for the case of an HI intensity map survey. Compared to the concordance model with the same small-scale power at z = 0, quintessence boosts the angular power by up to ? 15% at high redshifts, while power in the two models converges at low redshifts. The difference is mainly due to the background evolution, driven mostly by the normalization of the power spectrum today. The dark energy perturbations make only a small contribution on the largest scales, and a negligible contribution on smaller scales. Ironically, the dark energy perturbations remove the false boost of large-scale power that arises if we impose the (unphysical) assumption that the dark energy is smooth.
Eight powers of ten: similarities in black hole accretion on all mass scales
Rob Fender; Elmar Koerding; Tomaso Belloni; Phil Uttley; Ian McHardy; Tasso Tzioumis
2007-06-26T23:59:59.000Z
In this paper we discuss the recent advances in the quantitative comparison of accretion, and the accretion:jet coupling, in accreting black holes in both X-ray binaries (where M ~ 10Msun) and Active Galactic Nuclei (10^5Msun < M < 10^9Msun). These similarities include the radiative efficiency and jet power as a function of accretion rate, which are themselves probably the origin of the `fundamental plane of black hole activity'. A second `fundamental plane' which connects mass, accretion rate and timing properties provides us with a further physical diagnostic. Patterns of radio loudness (i.e. jet production) as a function of luminosity and accretion state are shown to be similar for X-ray binaries and AGN. Finally we discuss how neutron stars are a useful control sample, and what the future may hold for this field.
V. Skalsky
2000-09-25T23:59:59.000Z
The present temperature of cosmic background radiation and the present number density of photons of cosmic background radiation in the observed expansive and isotropic relativistic Universe is in the standard model of universe explained by the assumption of emergence of the photons of cosmic background radiation on the horizon (of the most remote visibility). However, the physical analysis shows unambiguously that this assumption contradicts the special theory of relativity and the quantum mechanics.
Flexural unfolding of horizons using paleomagnetic vectors M.J. Ramn a,b,*, Emilio L. Pueyo a
Zaragoza, Universidad de
Flexural unfolding of horizons using paleomagnetic vectors M.J. RamÃ³n a,b,*, Emilio L. Pueyo a , JosÃ© Luis Briz c,d , AndrÃ©s PocovÃ b , JosÃ© Carlos Ciria c a Instituto GeolÃ³gico y Minero de EspaÃ±a (IGME), Unidad de Zaragoza, Zaragoza, Spain b Departamento de Ciencias de la Tierra, University
Personalized Email Community Detection using Collaborative Similarity Measure
Nawaz, Waqas; Khan, Kifayat-Ullah; Lee, Young-Koo
2013-01-01T23:59:59.000Z
Email service providers have employed many email classification and prioritization systems over the last decade to improve their services. In order to assist email services, we propose a personalized email community detection method to discover the groupings of email users based on their structural and semantic intimacy. We extract the personalized social graph from a set of emails by uniquely leveraging each node with communication behavior. Subsequently, collaborative similarity measure (CSM) based intra-graph clustering approach detects personalized communities. The empirical analysis shows effectiveness of the resultant communities in terms of evaluation measures, i.e. density, entropy and f-measure. Moreover, email strainer, dynamic group prediction, and fraudulent account detection are suggested as the potential applications from both the service provider and user's point of view.
Self-similar expansion of a warm dense plasma
Djebli, Mourad [USTHB, Faculty of Physics, Theoretical Physics Laboratory, B.P. 32 Bab-Ezzouar, 16079 Algiers (Algeria)] [USTHB, Faculty of Physics, Theoretical Physics Laboratory, B.P. 32 Bab-Ezzouar, 16079 Algiers (Algeria); Moslem, Waleed M. [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)] [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)
2013-07-15T23:59:59.000Z
The properties of an expanding plasma composed of degenerate electron fluid and non-degenerate ions are studied. For our purposes, we use fluid equations for ions together with the electron momentum equation that include quantum forces (e.g., the quantum statistical pressure, forces due to the electron-exchange and electron correlations effects) and the quasi-neutrality condition. The governing equation is written in a tractable form by using a self-similar transformation. Numerical results for typical beryllium plasma parameters revealed that, during the expansion, the ion acoustic speed decreases for both isothermal and adiabatic ion pressure. When compared with classical hydrodynamic plasma expansion model, the electrons and ions are found to initially escape faster in vacuum creating thus an intense electric field that accelerates most of the particles into the vacuum ahead of the plasma expansion. The relevancy of the present model to beryllium plasma produced by a femto-second laser is highlighted.
Circuit architecture explains functional similarity of bacterial heat shock responses
Inoue, Masayo; Trusina, Ala
2012-01-01T23:59:59.000Z
Heat shock response is a stress response to temperature changes and a consecutive increase in amounts of unfolded proteins. To restore homeostasis, cells upregulate chaperones facilitating protein folding by means of transcription factors (TF). We here investigate two heat shock systems: one characteristic to gram negative bacteria, mediated by transcriptional activator sigma32 in E. coli, and another characteristic to gram positive bacteria, mediated by transcriptional repressor HrcA in L. lactis. We construct simple mathematical model of the two systems focusing on the negative feedbacks, where free chaperons suppress sigma32 activation in the former, while they activate HrcA repression in the latter. We demonstrate that both systems, in spite of the difference at the TF regulation level, are capable of showing very similar heat shock dynamics. We find that differences in regulation impose distinct constrains on chaperone-TF binding affinities: the binding constant of free sigma32 to chaperon DnaK, known to...
The effects of similarity breaking on the intracluster medium
E. J. Lloyd-Davies; R. G. Bower; T. J. Ponman
2002-03-28T23:59:59.000Z
We construct a family of simple analytical models of galaxy clusters at the present epoch and compare its predictions with observational data. We explore two processes that break the self-similarity of galaxy clusters: systematic variation in the dark matter halo concentration and energy injection into the intracluster gas, through their effects on the observed cluster properties. Three observed relations between cluster properties and temperature are employed to constrain the model; mass, slope of gas density profile (beta) and luminosity. The slope of the mass-temperature relation is found to be reproduced by our model when the observed variation in concentration is included, raising the slope from the self-similar prediction of 1.5, to that of the observed relation, ~ 2. Heating of the gas is observed to have little effect on the mass-temperature relation. The mean trend in the beta-temperature relation is reproduced by energy injection of 0.5-0.75 keV per particle, while concentration variation has only a small effect. Excess energies calculated for individual systems from the beta-temperature relation suggest that the lowest mass systems may have excess energies that are biased to lower values by selection effects. The observed properties of the luminosity-temperature relation are reproduced by the combined effects of excess energy and a trend in the dark matter concentration. At high masses the observed variation in dark matter concentration results a slope of ~ 2.7 compared to recent observations in the range 2.6-2.9, whilst the observed steepening in galaxy groups is predicted when heating of 0.5-0.75 keV per particle is included. Hence a combination of energy injection and dark matter concentration variation appears able to account for the mean trends in the observed relations.
Haberl, J. S.; Athar, A.; Claridge, D. E.
1998-01-01T23:59:59.000Z
This report summarizes the work performed for TESCOR Energy Services through Energy Systems Associates and New Horizons Technology. This work includes the monitoring and analysis of data from the data logger that was installed in the Toronto Library...
Merkens, Karlina Paul
2013-01-01T23:59:59.000Z
2.4.1 Seasonal and Oil-spill related trends . . 2.4.2 Diel1.4 The Deepwater Horizon Oil Spill . . . . 1.5 DataOil Figure Figure Figure Figure Figure Figure Figure Figure
Stress-energy tensor in colliding plane wave space-times: An approximation procedure
Miquel Dorca
1997-11-07T23:59:59.000Z
In a recent work on the quantization of a massless scalar field in a particular colliding plane wave space-time, we computed the vacuum expectation value of the stress-energy tensor on the physical state which corresponds to the Minkowski vacuum before the collision of the waves. We did such a calculation in a region close to both the Killing-Cauchy horizon and the folding singularities that such a space-time contains. In the present paper, we give a suitable approximation procedure to compute this expectation value, in the conformal coupling case, throughout the causal past of the center of the collision. This will allow us to approximately study the evolution of such an expectation value from the beginning of the collision until the formation of the Killing-Cauchy horizon. We start with a null expectation value before the arrival of the waves, which then acquires nonzero values at the beginning of the collision and grows unbounded towards the Killing-Cauchy horizon. The value near the horizon is compatible with our previous result, which means that such an approximation may be applied to other colliding plane wave space-times. Even with this approximation, the initial modes propagated into the interaction region contain a function which cannot be calculated exactly and to ensure the correct regularization of the stress-energy tensor with the point-splitting technique, this function must be given up to adiabatic order four of approximation.
Sebastiano Bernuzzi; Alessandro Nagar; Anil Zenginoglu
2012-12-19T23:59:59.000Z
We study the horizon absorption of gravitational waves in coalescing, circularized, nonspinning black hole binaries. The horizon absorbed fluxes of a binary with a large mass ratio (q=1000) obtained by numerical perturbative simulations are compared with an analytical, effective-one-body (EOB) resummed expression recently proposed. The perturbative method employs an analytical, linear in the mass ratio, effective-one-body (EOB) resummed radiation reaction, and the Regge-Wheeler-Zerilli (RWZ) formalism for wave extraction. Hyperboloidal (transmitting) layers are employed for the numerical solution of the RWZ equations to accurately compute horizon fluxes up to the late plunge phase. The horizon fluxes from perturbative simulations and the EOB-resummed expression agree at the level of a few percent down to the late plunge. An upgrade of the EOB model for nonspinning binaries that includes horizon absorption of angular momentum as an additional term in the resummed radiation reaction is then discussed. The effect of this term on the waveform phasing for binaries with mass ratios spanning 1 to 1000 is investigated. We confirm that for comparable and intermediate-mass-ratio binaries horizon absorbtion is practically negligible for detection with advanced LIGO and the Einstein Telescope (faithfulness greater than or equal to 0.997).
Self-similar pulse evolution in an all-normal-dispersion laser
Renninger, William H.; Chong, Andy; Wise, Frank W. [Department of Applied Physics, Cornell University, 212 Clark Hall, Ithaca, New York 14853 (United States)
2010-08-15T23:59:59.000Z
Parabolic amplifier similaritons are observed inside a normal-dispersion laser. The self-similar pulse is a local nonlinear attractor in the gain segment of the oscillator. The evolution in the laser exhibits large (20 times) spectral breathing, and the pulse chirp is less than the group-velocity dispersion of the cavity. All of these features are consistent with numerical simulations. The amplifier similariton evolution also yields practical features such as parabolic output pulses with high energies, and the shortest pulses to date from a normal-dispersion laser.
Kagan, Grigory; Rinderknecht, H G; Rosenberg, M J; Zylstra, A B; Huang, C -K
2015-01-01T23:59:59.000Z
The distribution function of suprathermal ions is found to be self-similar under conditions relevant to inertial confinement fusion hot-spots. By utilizing this feature, interference between the hydro-instabilities and kinetic effects is for the first time assessed quantitatively to find that the instabilities substantially aggravate the fusion reactivity reduction. The ion tail depletion is also shown to lower the experimentally inferred ion temperature, a novel kinetic effect that may explain the discrepancy between the exploding pusher experiments and rad-hydro simulations and contribute to the observation that temperature inferred from DD reaction products is lower than from DT at National Ignition Facility.
Environment Induced Time Arrow
Janos Polonyi
2012-06-25T23:59:59.000Z
The spread of the time arrows from the environment to an observed subsystem is followed within a harmonic model. A similarity is pointed out between irreversibility and a phase with spontaneously broken symmetry. The causal structure of interaction might be lost in the irreversible case, as well. The Closed Time Path formalism is developed for classical systems and shown to handle the time arrow problem in a clear and flexible manner. The quantum case is considered, as well, and the common origin of irreversibility and decoherence is pointed out.
A classification of spherically symmetric self-similar dust models
B. J. Carr
2000-03-02T23:59:59.000Z
We classify all spherically symmetric dust solutions of Einstein's equations which are self-similar in the sense that all dimensionless variables depend only upon $z\\equiv r/t$. We show that the equations can be reduced to a special case of the general perfect fluid models with equation of state $p=\\alpha \\mu$. The most general dust solution can be written down explicitly and is described by two parameters. The first one (E) corresponds to the asymptotic energy at large $|z|$, while the second one (D) specifies the value of z at the singularity which characterizes such models. The E=D=0 solution is just the flat Friedmann model. The 1-parameter family of solutions with z>0 and D=0 are inhomogeneous cosmological models which expand from a Big Bang singularity at t=0 and are asymptotically Friedmann at large z; models with E>0 are everywhere underdense relative to Friedmann and expand forever, while those with E0 ones. The 2-parameter solutions with D>0 again represent inhomogeneous cosmological models but the Big Bang singularity is at $z=-1/D$, the Big Crunch singularity is at $z=+1/D$, and any particular solution necessarily spans both z0. While there is no static model in the dust case, all these solutions are asymptotically ``quasi-static'' at large $|z|$. As in the D=0 case, the ones with $E \\ge 0$ expand or contract monotonically but the latter may now contain a naked singularity. The ones with E<0 expand from or recollapse to a second singularity, the latter containing a black hole.
Integrated method for chaotic time series analysis
Hively, L.M.; Ng, E.G.
1998-09-29T23:59:59.000Z
Methods and apparatus for automatically detecting differences between similar but different states in a nonlinear process monitor nonlinear data are disclosed. Steps include: acquiring the data; digitizing the data; obtaining nonlinear measures of the data via chaotic time series analysis; obtaining time serial trends in the nonlinear measures; and determining by comparison whether differences between similar but different states are indicated. 8 figs.
Integrated method for chaotic time series analysis
Hively, Lee M. (Philadelphia, TN); Ng, Esmond G. (Concord, TN)
1998-01-01T23:59:59.000Z
Methods and apparatus for automatically detecting differences between similar but different states in a nonlinear process monitor nonlinear data. Steps include: acquiring the data; digitizing the data; obtaining nonlinear measures of the data via chaotic time series analysis; obtaining time serial trends in the nonlinear measures; and determining by comparison whether differences between similar but different states are indicated.
E-Print Network 3.0 - amplitudes surprising similarities Sample...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
the relative EJP amplitude range is similar. The last bar (labeled "Ave") in the bottom panel... to average EJP amplitude; all muscle fibers show similar ... Source: Weaver, Adam...
Qiu, Dan; Gao, Muqiang; Li, Genyi; Quiros, Carlos
2009-01-01T23:59:59.000Z
AND GENOMICS Comparative sequence analysis for Brassicaoleracea with similar sequences in B. rapa and Arabidopsisanalyzed them with similar sequences in A. thaliana and B.
TransPlanckian Particles and the Quantization of Time
G. 't Hooft
1998-05-20T23:59:59.000Z
Trans-Planckian particles are elementary particles accelerated such that their energies surpass the Planck value. There are several reasons to believe that trans-Planckian particles do not represent independent degrees of freedom in Hilbert space, but they are controlled by the cis-Planckian particles. A way to learn more about the mechanisms at work here, is to study black hole horizons, starting from the scattering matrix Ansatz. By compactifying one of the three physical spacial dimensions, the scattering matrix Ansatz can be exploited more efficiently than before. The algebra of operators on a black hole horizon allows for a few distinct representations. It is found that this horizon can be seen as being built up from string bits with unit lengths, each of which being described by a representation of the SO(2,1) Lorentz group. We then demonstrate how the holographic principle works for this case, by constructing the operators corresponding to a field in space-time. The parameter t turns out to be quantized in Planckian units, divided by the period R of the compactified dimension.
THE VALUE OF ROLLING-HORIZON POLICIES FOR RISK-AVERSE ...
2011-09-17T23:59:59.000Z
The problem of measuring hydraulic risk for the OOP was first explored in Brignol ..... time step; a nonnegative control variable ut, the turbine outflow; and ?t, the ...
Top-k Set Similarity Joins Chuan Xiao Wei Wang Xuemin Lin Haichuan Shang
Lin, Xuemin
Top-k Set Similarity Joins Chuan Xiao Wei Wang Xuemin Lin Haichuan Shang The University of New threshold. In this paper, we study a variant of the similarity join, termed top-k set similarity join. It returns the top-k pairs of records ranked by their similarities, thus eliminating the guess work users
Caticha, Ariel [Department of Physics, University at Albany-SUNY, Albany, NY 12222 (United States)
2011-03-14T23:59:59.000Z
The formulation of quantum mechanics within the framework of entropic dynamics includes several new elements. In this paper we concentrate on one of them: the implications for the theory of time. Entropic time is introduced as a book-keeping device to keep track of the accumulation of changes. One new feature is that, unlike other concepts of time appearing in the so-called fundamental laws of physics, entropic time incorporates a natural distinction between past and future.
G. 't Hooft
2005-04-25T23:59:59.000Z
Interactions between outgoing Hawking particles and ingoing matter are determined by gravitational forces and Standard Model interactions. In particular the gravitational interactions are responsible for the unitarity of the scattering against the horizon, as dictated by the holographic principle, but the Standard Model interactions also contribute, and understanding their effects is an important first step towards a complete understanding of the horizon's dynamics. The relation between in- and outgoing states is described in terms of an operator algebra. In this paper, the first of a series, we describe the algebra induced on the horizon by U(1) vector fields and scalar fields, including the case of an Englert-Brout-Higgs mechanism, and a more careful consideration of the transverse vector field components.
Qiang Zhao; Jian Min Dong; Jun Ling Song; Wen Hui Long
2014-07-23T23:59:59.000Z
Half-life of proton radioactivity of spherical proton emitters is studied within the scheme of covariant density functional (CDF) theory, and for the first time the potential barrier that prevents the emitted proton is extracted with the similarity renormalization group (SRG) method, in which the spin-orbit potential along with the others that turn out to be non-negligible can be derived automatically. The spectroscopic factor that is significant is also extracted from the CDF calculations. The estimated half-lives are found in good agreement with the experimental values, which not only confirms the validity of the CDF theory in describing the proton-rich nuclei, but also indicates the prediction power of present approach to calculate the half-lives and in turn to extract the structural information of proton emitters.
Oblique and conical shock similarity laws for non-equilibrium flows
Holster, Jesse Louis
1968-01-01T23:59:59.000Z
. IV. VI. INTRODUCTION REVIEN OF PREVIOUS WORK. OBl I'VE SHOCK VIBRATIONAL SIMILITUDE CHEilllCAL iNOZ -EQUILI BRIIVl EXTENSIOiN TO CONICAL FLON. RE1IARKS AND CONCLUSIONS. REFERENCES APPENDIX Page 12 22 31 37 39 LIST OF FIGUWHS Figure... Normal Shock Vibrational Similarity Param ter Normal Shock Dissociation Similarity Parameter Page 10 Oblique Shock Vibrational Similarity Law 19 Oblique Shock Dissociation Similarity Parameter Conical Shock Dissociation Similarity Parameter...
Lee, Leslie
2011-01-01T23:59:59.000Z
Winter 2011 tx H2O 3 or just a drop in thebucket?Texas scientists on the real e#31;ects of the Deepwater Horizon oil spill 4 tx H2O Winter 2011 Environmental Disaster Continued What if gasoline pumped into cars, seafood eaten at restaurants... but forgo#27;en as the wreckage of the Deepwater Horizon MC#31;#30;#31; drilling platform sank into its waters. A crude awakening Like any large oil spill, this one took its toll in many ways. Eleven BP employees on the rig died in the explosion...
Lee, Leslie
2011-01-01T23:59:59.000Z
Winter 2011 tx H2O 3 or just a drop in thebucket?Texas scientists on the real e#31;ects of the Deepwater Horizon oil spill 4 tx H2O Winter 2011 Environmental Disaster Continued What if gasoline pumped into cars, seafood eaten at restaurants... but forgo#27;en as the wreckage of the Deepwater Horizon MC#31;#30;#31; drilling platform sank into its waters. A crude awakening Like any large oil spill, this one took its toll in many ways. Eleven BP employees on the rig died in the explosion...
Comprehensive energy transport scalings derived from DIII-D similarity experiments
Petty, C.C.; Luce, T.C. [General Atomics, San Diego, CA (United States); Baity, F.W. [Oak Ridge National Lab., TN (United States)] [and others
1998-12-01T23:59:59.000Z
The dependences of heat transport on the dimensionless plasma physics parameters has been measured for both L-mode and H-mode plasmas on the DIII-D tokamak. Heat transport in L-mode plasmas has a gyroradius scaling that is gyro-Bohm-like for electrons and worse than Bohm-like for ions, with no measurable beta or collisionality dependence; this corresponds to having an energy confinement time that scales like {tau}{sub E} {proportional_to} n{sup 0.5}P{sup {minus}0.5}. H-mode plasmas have gyro-Bohm-like scaling of heat transport for both electrons and ions, weak beta scaling, and moderate collisionality scaling. In addition, H-mode plasmas have a strong safety factor scaling ({chi} {approximately} q{sup 2}) at all radii. Combining these four dimensionless parameter scalings together gives an energy confinement time scaling for H-mode plasmas like {tau}{sub E} {proportional_to} B{sup {minus}1}{rho}{sup {minus}3.15}{beta}{sup 0.03}v{sup {minus}0.42}q{sub 95}{sup {minus}1.43} {proportional_to} I{sup 0.84}B{sup 0.39}n{sup 0.18}P{sup {minus}0.41}L{sup 2.0}, which is similar to empirical scalings derived from global confinement databases.
Meyers, Steven D.
offshore oil spill in U.S. history. This spill, which continued for 3 months, presented an unprecedented spills in many ways. Crude oil was introduced at the ocean bottom in 1500 m of water, a depthTrajectory Forecast as a Rapid Response to the Deepwater Horizon Oil Spill Yonggang Liu, Robert H
Weston, Ken
Of the estimated 5 million barrels of crude oil released into the Gulf of Mexico from the Deepwater Horizon oil spill, a fraction washed ashore onto sandy beaches from Louisiana to the Florida panhandle. Researchers at the MagLab compare the detailed molecular analysis of hydrocarbons in oiled sands from
Nagarajaiah, Satish
DEEPWATER HORIZON OIL SPILL ESTIMATE: UPDATE JUNE 11, 2010 by Professor Satish Nagarajaiah, Rice. http://www.nytimes.com/2010/06/11/us/11spill.html?hp New Estimates Double Rate of Oil Flowing on Thursday essentially doubled its estimate of how much oil has been spewing from the out-of-control BP well
Buckel, Jeffrey A.
Colony Fusion in Argentine Ants is Guided by Worker and Queen Cuticular Hydrocarbon Profile of unrelated L. humile colonies that share similar CHC profiles. In this study, we paired six southeastern U profile similarity between colonies was associated with colony fusion and intercolony genetic similarity
Delivery Cost Approximations for Inventory Routing Problems in a Rolling Horizon Framework
Jaillet, Patrick
Paris cedex 07, France. Supported in part by ONR, Discrete Mathematics Division, grant N00014 is concerned with the repeated distribution of a commodity, such as heating oil, over a long period of time inventory of the commodity. Their consumption varies daily and cannot be predicted deterministically
Gaussian Processes for Short-Horizon Wind Power Forecasting Joseph Bockhorst, Chris Barber
Bockhorst, Joseph
on this task, and attention has shifted to statistical and machine learning approaches. Among the challenges of wind energy into electrical trans- mission systems. The importance of wind forecasts for wind energy throughout a power system must be nearly in balance at all times, 2) because it depends strongly on wind
An examination of content similarity within the memory of HPC applications.
Levy, Scott N. [University of New Mexico; Bridges, Patrick G. [University of New Mexico; Ferreira, Kurt Brian; Thompson, Aidan Patrick; Trott, Christian Robert
2013-01-01T23:59:59.000Z
Memory content similarity has been e ectively exploited for more than a decade to reduce memory consumption. By consolidating duplicate and similar pages in the address space of an application, we can reduce the amount of memory it consumes without negatively a ecting the application's perception of the memory resources available to it. In addition to memory de-duplication, there may be many other ways that we can exploit memory content similarity to improve system characteristics. In this paper, we examine the memory content similarity of several HPC applications. By characterizing the memory contents of these applications, we hope to provide a basis for ef- forts to e ectively exploit memory content similarity to improve system performance beyond memory deduplication. We show that several applications exhibit signi cant similarity and consider the source of the similarity.
Kemner, Ken
The wind power probability density forecast problem can be formulated as: forecast the wind power ahead) knowing a set of explanatory variables (e.g. numerical weather predictions (NWPs), wind power measured values). Translating this sentence to an equation, we have: where pt+k is the wind power
Guo, Jiali; Li, Hongyi; Leung, Lai-Yung R.; Guo, Shenglian; Liu, Pan; Sivapalan, Murugesu
2014-03-28T23:59:59.000Z
This paper presents the results of a data based comparative study of several hundred catchments across continental United States belonging to the MOPEX dataset, which systematically explored the connection between the flood frequency curve and measures of mean annual water balance. Two different measures of mean annual water balance are used: (i) a climatic aridity index, AI, which is a measure of the competition between water and energy availability at the annual scale; and, (ii) baseflow index, BFI, the ratio of slow runoff to total runoff also at the annual time scale, reflecting the role of geology, soils, topography and vegetation. The data analyses showed that the aridity index, AI, has a first order control on both the mean and Cv of annual maximum floods. While mean annual flood decreases with increasing aridity, Cv increases with increasing aridity. BFI appeared to be a second order control on the magnitude and shape of the flood frequency curve. Higher BFI, meaning more subsurface flow and less surface flow leads to a decrease of mean annual flood whereas lower BFI leads to accumulation of soil moisture and increased flood magnitudes that arise from many events acting together. The results presented in this paper provide innovative means to delineate homogeneous regions within which the flood frequency curves can be assumed to be functionally similar. At another level, understanding the connection between annual water balance and flood frequency will be another building block towards developing comprehensive understanding of catchment runoff behavior in a holistic way.
Similarity and generalized analysis of efficiencies of thermal energy storage systems
Peiwen Li; Jon Van Lew; Cholik Chan; Wafaa Karaki; Jake Stephens; J. E. O'Brien
2012-03-01T23:59:59.000Z
This paper examined the features of three typical thermal storage systems including: (1) direct storage of heat transfer fluid in containers, (2) storage of thermal energy in a packed bed of solid filler material, with energy being carried in/out by a flowing heat transfer fluid which directly contacts the packed bed, and (3) a system in which heat transfer fluid flows through tubes that are imbedded into a thermal storage material which may be solid, liquid, or a mixture of the two. The similarity of the three types of thermal storage systems was discussed, and generalized energy storage governing equations were introduced in both dimensional and dimensionless forms. The temperatures of the heat transfer fluid during energy charge and discharge processes and the overall energy storage efficiencies were studied through solution of the energy storage governing equations. Finally, provided in the paper are a series of generalized charts bearing curves for energy storage effectiveness against four dimensionless parameters grouped up from many of the thermal storage system properties including dimensions, fluid and thermal storage material properties, as well as the operational conditions including mass flow rate of the fluid, and the ratio of energy charge and discharge time periods. Engineers can conveniently look up the charts to design and calibrate the size of thermal storage tanks and operational conditions without doing complicated individual modeling and computations. It is expected that the charts will serve as standard tools for thermal storage system design and calibration.
TIMELY DELIVERY OF LASER INERTIAL FUSION ENERGY (LIFE)
Dunne, A M
2010-11-30T23:59:59.000Z
The National Ignition Facility (NIF), the world's largest and most energetic laser system, is now operational at Lawrence Livermore National Laboratory. A key goal of the NIF is to demonstrate fusion ignition for the first time in the laboratory. Its flexibility allows multiple target designs (both indirect and direct drive) to be fielded, offering substantial scope for optimization of a robust target design. In this paper we discuss an approach to generating gigawatt levels of electrical power from a laser-driven source of fusion neutrons based on these demonstration experiments. This 'LIFE' concept enables rapid time-to-market for a commercial power plant, assuming success with ignition and a technology demonstration program that links directly to a facility design and construction project. The LIFE design makes use of recent advances in diode-pumped, solid-state laser technology. It adopts the paradigm of Line Replaceable Units utilized on the NIF to provide high levels of availability and maintainability and mitigate the need for advanced materials development. A demonstration LIFE plant based on these design principles is described, along with the areas of technology development required prior to plant construction. A goal-oriented, evidence-based approach has been proposed to allow LIFE power plant rollout on a time scale that meets policy imperatives and is consistent with utility planning horizons. The system-level delivery builds from our prior national investment over many decades and makes full use of the distributed capability in laser technology, the ubiquity of semiconductor diodes, high volume manufacturing markets, and U.S. capability in fusion science and nuclear engineering. The LIFE approach is based on the ignition evidence emerging from NIF and adopts a line-replaceable unit approach to ensure high plant availability and to allow evolution from available technologies and materials. Utilization of a proven physics platform for the ignition scheme is an essential component of an acceptably low-risk solution. The degree of coupling seen on NIF between driver and target performance mandates that little deviation be adopted from the NIF geometry and beamline characteristics. Similarly, the strong coupling between subsystems in an operational power plant mandates that a self-consistent solution be established via an integrated facility delivery project. The benefits of separability of the subsystems within an IFE plant (driver, chamber, targets, etc.) emerge in the operational phase of a power plant rather than in its developmental phase. An optimized roadmap for IFE delivery needs to account for this to avoid nugatory effort and inconsistent solutions. For LIFE, a system design has been established that could lead to an operating power plant by the mid-2020s, drawing from an integrated subsystem development program to demonstrate the required technology readiness on a time scale compatible with the construction plan. Much technical development work still remains, as does alignment of key stakeholder groups to this newly emerging development option. If the required timeline is to be met, then preparation of a viable program is required alongside the demonstration of ignition on NIF. This will enable timely analysis of the technical and economic case and establishment of the appropriate delivery partnership.
Quantum field theory in spaces with closed time-like curves
Boulware, D.G.
1992-12-31T23:59:59.000Z
Gott spacetime has closed timelike curves, but no locally anomalous stress-energy. A complete orthonormal set of eigenfunctions of the wave operator is found in the special case of a spacetime in which the total deficit angle is 27{pi}. A scalar quantum field theory is constructed using these eigenfunctions. The resultant interacting quantum field theory is not unitary because the field operators can create real, on-shell, particles in the acausal region. These particles propagate for finite proper time accumulating an arbitrary phase before being annihilated at the same spacetime point as that at which they were created. As a result, the effective potential within the acausal region is complex, and probability is not conserved. The stress tensor of the scalar field is evaluated in the neighborhood of the Cauchy horizon; in the case of a sufficiently small Compton wavelength of the field, the stress tensor is regular and cannot prevent the formation of the Cauchy horizon.
Quantum field theory in spaces with closed time-like curves. [Gott space
Boulware, D.G.
1992-01-01T23:59:59.000Z
Gott spacetime has closed timelike curves, but no locally anomalous stress-energy. A complete orthonormal set of eigenfunctions of the wave operator is found in the special case of a spacetime in which the total deficit angle is 27[pi]. A scalar quantum field theory is constructed using these eigenfunctions. The resultant interacting quantum field theory is not unitary because the field operators can create real, on-shell, particles in the acausal region. These particles propagate for finite proper time accumulating an arbitrary phase before being annihilated at the same spacetime point as that at which they were created. As a result, the effective potential within the acausal region is complex, and probability is not conserved. The stress tensor of the scalar field is evaluated in the neighborhood of the Cauchy horizon; in the case of a sufficiently small Compton wavelength of the field, the stress tensor is regular and cannot prevent the formation of the Cauchy horizon.
Banks, T
2015-01-01T23:59:59.000Z
I explain, in non-technical terms, the basic ideas of Holographic Space-time (HST) models of quantum gravity (QG). The key feature is that the degrees of freedom (DOF) of QG, localized in a finite causal diamond are restrictions of an algebra of asymptotic currents, describing flows of quantum numbers out to null infinity in Minkowski space, with zero energy density on the sphere at infinity. Finite energy density states are constrained states of these DOF and the resulting relation between asymptotic energy and the number of constraints, explains the relation between black hole entropy and energy, as well as the critical energy/impact parameter regime in which particle scattering leads to black hole formation. The results of a general class of models, implementing these principles, are described, and applied to understand the firewall paradox, and to construct a finite model of the early universe, which implements inflation with only the minimal fine tuning needed to obtain a universe containing localized ex...
Time symmetry in wave function collapse models
Daniel Bedingham
2015-02-25T23:59:59.000Z
A framework for wave function collapse models that is symmetric under time reversal is presented. Within this framework there are equivalent pictures of collapsing wave functions evolving in both time directions. The backwards-in-time Born rule can be broken by an initial condition on the Universe resulting in asymmetric behaviour. Similarly the forwards-in-time Born rule can in principle be broken by a final condition on the Universe.
K. Karami; A. Abdolmaleki
2011-01-31T23:59:59.000Z
We investigate the validity of the generalized second law of gravitational thermodynamics in a non-flat FRW universe containing the interacting new agegraphic dark energy with cold dark matter. The boundary of the universe is assumed to be enclosed by the dynamical apparent horizon. We show that for this model, the equation of state parameter can cross the phantom divide. We also present that for the selected model under thermal equilibrium with the Hawking radiation, the generalized second law is always satisfied throughout the history of the universe. Whereas, the evolution of the entropy of the universe and apparent horizon, separately, depends on the equation of state parameter of the interacting new agegraphic dark energy model.
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del SolStrengthening a solidSynthesis ofwas publishedThree scientistsDepartmentTime Off
Hs@~7A Receding Horizon @)8f$K4p$E$/ ;k3P%U%#!<%I%P%C%/$K$D$$$F
with the vision-based robot motion control via the nonlinear receding horizon control approach. We propose feedback control law. The control goal is to place the planar robot end-e#11;ector over a desired static. ;~9ot $K$*$$$F, MÂ8B6h4V [t; t +T ] $G:GE,2=LdBj$r2r$Â, $=$N:]$N2r$H$7$F, :GE,@)8fB'u #3; (#28
The Photorhabdus Pir toxins are similar to a developmentally regulated insect protein but show
Hammock, Bruce D.
The Photorhabdus Pir toxins are similar to a developmentally regulated insect protein but show relatedÃ? (Pir) proteins A and B, show similarity both to d-endotoxins from Bacillus thuringiensis (Bts of expression and the Photorhabdus proteins PirA and PirB have been proposed to be mimics of insect JHEs
PageSim: A Novel Link-based Similarity Measure for the World Wide Web
King, Kuo Chin Irwin
PageSim: A Novel Link-based Similarity Measure for the World Wide Web Zhenjiang Lin, Irwin King the similarity between web pages arises in many applications on the Web, such as web searching engine and web document classification. According to the unique characteristics of the Web, which are huge, rapidly
ccsd00000995 The genealogy of self-similar fragmentations with negative
ccsdÂ00000995 (version 1) : 5 Jan 2004 The genealogy of self-similar fragmentations with negative of the self-similar fragmentation. A genealogy is naturally associated to such fragmentation processes, one guesses that there should be a natural way to de#12;ne a genealogy tree, rooted at the initial
Nicoli, Monica
Abstract 3-D seismic surveys generate 5-D data volume. In order to estimate the horizons for interpretation and further processing, the traveltime picking needs to be performed on n-D subsets of this 5-D to support the interpreters in the estimation of the events by preserving their depth continuity. The HP
James S. Graber
2000-12-09T23:59:59.000Z
Type Ia supernovae are thought to explode completely, leaving no condensed remnant, only an expanding shell. Other types of supernovae are thought to involve core collapse and are expected to leave a condensed remnant, which could be either a neutron star or a black hole, or just possibly, something more exotic, such as a quark orstrange star, a naked singularity, a frozen star, a wormhole or a red hole. It has proven surprisingly difficult to determine which type of condensed remnant has been formed in those cases where the diagnostic highly regular pulsar signature of a neutron star is absent. We consider possible observational differences between the two standard candidates, as well as the more speculative alternatives. We classify condensed remnants according to whether they do or do not possess three major features: 1)a hard surface, 2)an event horizon, and 3)a singularity. Black holes and neutron stars differ on all three criteria. Some of the less frequently considered alternatives are "intermediate," in the sense that they possess some of the traits of a black hole and some of the traits of a neutron star. This possibility makes distinguishing the various possibilities even more difficult.
Spatially Similar Practice Immediately Following Motor Sequence Learning Eliminates Offline Gains
Handa, Atul
2012-11-30T23:59:59.000Z
after initial practice has been revealed to eliminate offline improvement. The present experiment assessed the relative impact of experiencing supplemental practice of a spatially or a motorically-similar procedural task immediately following practice...
Duguid, Shona
2008-06-23T23:59:59.000Z
Kin selection does not entirely account for the choice of affiliative interactions among chimpanzees (Pan troglodytes). Other factors such as familiarity and similarity have been implicated as influences on association ...
New Methodology for Measuring Semantic Functional Similarity Based on Bidirectional Integration
Jeong, Jong Cheol
2013-05-31T23:59:59.000Z
1.2 billion users in facebook, 17 million articles in Wikipedia, and 190 million tweets per day have demanded significant increase of information processing through Internet in recent years. Similarly life sciences and ...
Streaming Similarity Search over One Billion Tweets Using Parallel Locality-Sensitive Hashing
Sundaram, Narayanan
Finding nearest neighbors has become an important operation on databases, with applications to text search, multimedia indexing, and many other areas. One popular algorithm for similarity search, especially for high ...
Curricular emphasis in Industrial Distribution programs and programs of similar theme
Miller, John Edward
2004-09-30T23:59:59.000Z
curricular groupings representing the required courses in those programs. The second phase of this study investigates the curricula of programs that contain a similar theme of focus at state-sponsored colleges and universities. The purpose is to identify...
Physics 116A Winter 2011 Diagonalization by a unitary similarity transformation
California at Santa Cruz, University of
Physics 116A Winter 2011 Diagonalization by a unitary similarity transformation In these notes, we transformation if and only if A is normal. Before proceeding, we record a few facts about unitary and hermitian
Mojahedi, Mohammad
Smithsonian/NASA ADS Physics/Geophysics Abstract Service · Find Similar Abstracts (with default | Query Form | Preferences | HELP | FAQ Physics/Geophysics arXiv e-prints Send Query Reset #12;
Comparison between VNIIEF computer programs used to study NPP safety and similar western codes
Pevnitsky, A.V.; Tarasov, V.A.; Solovyev, V.P. [and others
1995-12-31T23:59:59.000Z
This report gives schematic comparison between VNIIEF computer programs used to study NPP safety and similar western codes. This comparison is schematic and in no way pretends to be complete.
for similarity-based classification of a dual energy CT (DECT) angiography data set. The individual steps to robustly extract features in applications such as dual energy computed tomography of parts in industrial
Back to Basics for Monolingual Alignment: Exploiting Word Similarity and Contextual Evidence
Back to Basics for Monolingual Alignment: Exploiting Word Similarity and Contextual Evidence Md. Amid a variety of problem formulations and ingenious approaches to alignment, we take a step back
On a class of self-similar 2D surface water waves
Sijue Wu
2012-06-11T23:59:59.000Z
We construct a class of self-similar surface water waves and study its properties. This class of surface waves appears to be in very good agreement with a common type of wave crests in the ocean.
Limiting similarity and niche theory for structured populations Andras Szilagyi, Geza Meszena
MeszÃ©na, GÃ©za
Limiting similarity and niche theory for structured populations AndrÂ´as SzilÂ´agyi, GÂ´eza Mesz phone: 36-1-372-2795 email: szilagyi@angel.elte.hu J. Theor. Biol. in press Abstract We develop
asymptotic self-similar solutions: Topics by E-print Network
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24 25 Next Page Last Page Topic Index 1 Self-similar cosmological solutions with dark energy. I: formulation and asymptotic analysis HEP - Theory (arXiv) Summary: Based on the...
FLOW AND REACTIVE TRANSPORT IN POROUS MEDIA INDUCED BY WELL INJECTION: SIMILARITY SOLUTION
FLOW AND REACTIVE TRANSPORT IN POROUS MEDIA INDUCED BY WELL INJECTION: SIMILARITY SOLUTION C.J. VAN from laboratory batch experiments. Typical examples of isotherms are (see e.g. Freeze and Cherry [FC
Using Semantic Similarity to Predict Angle and Distance of Objects in Images
Davies, Jim
sterling@sterlingsomers .com Jonathan GagnÃ© Dept. Systems Design Engineering University of Waterloo 200Using Semantic Similarity to Predict Angle and Distance of Objects in Images Sterling Somers
Heat release by controlled continuous-time Markov jump processes
Paolo Muratore-Ginanneschi; Carlos Mejía-Monasterio; Luca Peliti
2012-12-17T23:59:59.000Z
We derive the equations governing the protocols minimizing the heat released by a continuous-time Markov jump process on a one-dimensional countable state space during a transition between assigned initial and final probability distributions in a finite time horizon. In particular, we identify the hypotheses on the transition rates under which the optimal control strategy and the probability distribution of the Markov jump problem obey a system of differential equations of Hamilton-Bellman-Jacobi-type. As the state-space mesh tends to zero, these equations converge to those satisfied by the diffusion process minimizing the heat released in the Langevin formulation of the same problem. We also show that in full analogy with the continuum case, heat minimization is equivalent to entropy production minimization. Thus, our results may be interpreted as a refined version of the second law of thermodynamics.
The Dimensions Of Self-Similar Sets Wenxia Li, Dongmei Xiao
Li, Wenxia
-similar set F we prove that dimH F = dimB F = dimP F using dif* *ferent method from Fa[4] and give Further dimH F = dimB F = dimP F = s and F is an s-set where).We* * denote the common value by ff0; (ii)dim HF = dimB F = dimP F = ff0s; (For self-similar set F Fa[4
A nonlinear eigenvalue problem for self-similar spherical force-free magnetic fields
Lerche, I. [Institut für Geowissenschaften, Naturwissenschaftliche Fakultät III, Martin-Luther Universität, D-06099 Halle (Germany); Low, B. C. [High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado 80307 (United States)
2014-10-15T23:59:59.000Z
An axisymmetric force-free magnetic field B(r, ?) in spherical coordinates is defined by a function r?sin??B{sub ?}=Q(A) relating its azimuthal component to its poloidal flux-function A. The power law r?sin??B{sub ?}=aA|A|{sup 1/n}, n a positive constant, admits separable fields with A=(A{sub n}(?))/(r{sup n}) , posing a nonlinear boundary-value problem for the constant parameter a as an eigenvalue and A{sub n}(?) as its eigenfunction [B. C. Low and Y. Q Lou, Astrophys. J. 352, 343 (1990)]. A complete analysis is presented of the eigenvalue spectrum for a given n, providing a unified understanding of the eigenfunctions and the physical relationship between the field's degree of multi-polarity and rate of radial decay via the parameter n. These force-free fields, self-similar on spheres of constant r, have basic astrophysical applications. As explicit solutions they have, over the years, served as standard benchmarks for testing 3D numerical codes developed to compute general force-free fields in the solar corona. The study presented includes a set of illustrative multipolar field solutions to address the magnetohydrodynamics (MHD) issues underlying the observation that the solar corona has a statistical preference for negative and positive magnetic helicities in its northern and southern hemispheres, respectively; a hemispherical effect, unchanging as the Sun's global field reverses polarity in successive eleven-year cycles. Generalizing these force-free fields to the separable form B=(H(?,?))/(r{sup n+2}) promises field solutions of even richer topological varieties but allowing for ?-dependence greatly complicates the governing equations that have remained intractable. The axisymmetric results obtained are discussed in relation to this generalization and the Parker Magnetostatic Theorem. The axisymmetric solutions are mathematically related to a family of 3D time-dependent ideal MHD solutions for a polytropic fluid of index ??=?4/3 as discussed in the Appendix.
Horizon 2020: Excellent Science
De Cindio, Fiorella
agriculture, marine and maritime research & the bioeconomy Secure, clean and efficient energy Smart, green
Expanding Professional Horizons
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
expands daily, by leaps and bounds - knowledge turnover must be accompanied by an infusion of new talent that both informs and is informed by existing, experienced staff. With...
Giribet, Gaston
2015-01-01T23:59:59.000Z
It has been argued recently that string theory effects qualitatively modify the effective black hole geometry experienced by modes with radial momentum of order $1/\\sqrt{\\alpha'}$. At tree level, these $\\alpha'$-effects can be explicitly worked out in two-dimensional string theory, and have a natural explanation in the T-dual description as coming from the integration of the zero-mode of the linear dilaton, what yields a contribution that affects the scattering phase-shift in a peculiar manner. It has also been argued that the phase-shift modification has its origin in a region of the moduli space that does not belong to the exterior black hole geometry, leading to the conclusion that at high energy the physics of the problem is better described by the dual model. Here, we elaborate on this argument. We consider the contribution of worldsheet instantons in the 2D Euclidean black hole sigma-model and study its influence on the phase-shift at high energy.
Gaston Giribet; Arash Ranjbar
2015-04-20T23:59:59.000Z
It has been argued recently that string theory effects qualitatively modify the effective black hole geometry experienced by modes with radial momentum of order $1/\\sqrt{\\alpha'}$. At tree level, these $\\alpha'$-effects can be explicitly worked out in two-dimensional string theory, and have a natural explanation in the T-dual description as coming from the integration of the zero-mode of the linear dilaton, what yields a contribution that affects the scattering phase-shift in a peculiar manner. It has also been argued that the phase-shift modification has its origin in a region of the moduli space that does not belong to the exterior black hole geometry, leading to the conclusion that at high energy the physics of the problem is better described by the dual model. Here, we elaborate on this argument. We consider the contribution of worldsheet instantons in the 2D Euclidean black hole sigma-model and study its influence on the phase-shift at high energy.
Not Available
1981-07-01T23:59:59.000Z
Research programs at LLNL for 1981 are described in broad terms. In his annual State of the Laboratory address, Director Roger Batzel projected a $481 million operating budget for fiscal year 1982, up nearly 13% from last year. In projects for the Department of Energy and the Department of Defense, the Laboratory applies its technical facilities and capabilities to nuclear weapons design and development and other areas of defense research that include inertial confinement fusion, nonnuclear ordnances, and particle-beam technology. LLNL is also applying its unique experience and capabilities to a variety of projects that will help the nation meet its energy needs in an environmentally acceptable manner. A sampling of recent achievements by LLNL support organizations indicates their diversity. (GHT)
Expanding Professional Horizons
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField8,Dist. Category UC-l 1,Energy Consumers | Department ofa KeyErin *
Dynamics and self-similarity in min-driven Govind Menon1
by Gallay and Mielke, extended using a careful choice of time scale. Keywords: dynamic scaling, coalescence
EsPRESSo: Efficient Privacy-Preserving Evaluation of Sample Set Similarity
Blundo, Carlo; Gasti, Paolo
2011-01-01T23:59:59.000Z
This paper presents the first practical construction for privacy-preserving evaluation of sample set similarity, based on the well-known Jaccard index measure. In this problem, two mutually distrustful entities determine how similar their sets are, without disclosing their content to each other. We propose two efficient protocols: the first securely computes the Jaccard index of two sets; the second approximates it using MinHash techniques, at a significantly lower cost and with same privacy guarantees. This building block is attractive in many relevant applications, including document similarity, biometric authentication, multimedia file retrieval, and genetic tests. We demonstrate, both analytically and experimentally, that our constructions -- while not bounded to any specific application -- are appreciably more efficient than prior specialized techniques.
Fixed point of self-similar Lennard-Jones potentials in the glass transition
Jialin Wu
2007-01-09T23:59:59.000Z
The existence of potential energy landscape in the glass transition has been theoretically proved using the recursive equation of reinforce-restraint of self-similar 8 orders of Lennard-Jones (L-J) potential fluctuations. The stability condition for fluctuation reinforce-restraint is just the Lindemann ratio that is exactly deduced as 0.1047in this paper. The origin and transfer of interface excitation comes of the balance between self-similar L-J potential fluctuation and geometric phase potential fluctuation, which also gives rise to a new attractive potential of -17/16\\epsilon_i, lower than the potential well energy -\\epsilon_i of i-th order of L-J potential, in the self-similar mean field of mean fields of different sizes. The delocalization energy of two-body is exactly the transfer energy of excited interface, and the delocalization path is along 8 orders of geodesics in topological analyses.
D.M. Reiner; T.E. Curry; M.A. de Figueiredo; H.J. Herzog; S.D. Ansolabehere; K. Itaoka; F. Johnsson; M. Odenberger [University of Cambridge, Cambridge (United Kingdom). Judge Business School
2006-04-01T23:59:59.000Z
Despite sharp differences in government policy, the views of the U.S. public on energy and global warming are remarkably similar to those in Sweden, Britain, and Japan. Americans do exhibit some differences, placing lower priority on the environment and global warming, and with fewer believing that 'global warming has been established as a serious problem and immediate action is necessary'. There also remains a small hard core of skeptics (<10%) who do not believe in the science of climate change and the need for action, a group that is much smaller in the other countries surveyed. The similarities are, however, pervasive. Similar preferences are manifest across a wide range of technology and fuel choices, in support of renewables, in research priorities, in a basic understanding of which technologies produce or reduce carbon dioxide (or misunderstandings in the case of nuclear power), and in willingness to pay for solving global warming. 29 refs., 3 figs., 2 tabs.
V. Skalsky
2000-09-25T23:59:59.000Z
In the standard model of universe the increase in mass of our observed expansive and isotropic relativistic Universe is explained by the hypothetical assumption of matter objects emerging on the horizon (of the most remote visibility). However, the mathematical-physical analysis of the increase of Universe gauge factor shows that this hypothetical assumption is non-compatible with the variants of the standard model of universe by which - according to the standard model of universe - can be described the expansive evolution of the Universe.
Local-global alignment for finding 3D similarities in protein structures
Zemla, Adam T. (Brentwood, CA)
2011-09-20T23:59:59.000Z
A method of finding 3D similarities in protein structures of a first molecule and a second molecule. The method comprises providing preselected information regarding the first molecule and the second molecule. Comparing the first molecule and the second molecule using Longest Continuous Segments (LCS) analysis. Comparing the first molecule and the second molecule using Global Distance Test (GDT) analysis. Comparing the first molecule and the second molecule using Local Global Alignment Scoring function (LGA_S) analysis. Verifying constructed alignment and repeating the steps to find the regions of 3D similarities in protein structures.
H. Hergert; S. K. Bogner; T. D. Morris; S. Binder; A. Calci; J. Langhammer; R. Roth
2014-10-28T23:59:59.000Z
We use the newly developed Multi-Reference In-Medium Similarity Renormalization Group to study all even isotopes of the calcium and nickel isotopic chains, based on two- plus three-nucleon interactions derived from chiral effective field theory. We present results for ground-state and two-neutron separation energies and quantify their theoretical uncertainties. At shell closures, we find excellent agreement with Coupled Cluster results obtained with the same Hamiltonians. Our results highlight the importance of the chiral 3N interaction to obtain a correct reproduction of experimental energy trends, and their subtle impact on the location of the neutron drip lines in the Ca and Ni chains. At the same time, we uncover and discuss deficiencies of the input Hamiltonians which need to be addressed by the next generation of chiral interactions.
Paris-Sud XI, Université de
1 The viscoelastic behaviour of raw and anaerobic digested sludge: strong similarities with soft confronted with a dramatically increasing flow of sewage sludge. To improve treatment efficiency, process reliable flow properties to simulate the process, this work is an attempt to approach sludge rheological
Clayton, Dale H.
Nuclear and Mitochondrial Genes Contain Similar Phylogenetic Signal for Pigeons and Doves (Aves of this assumption in the pigeons and doves (Aves: Columbiformes) by comparing phylog- enies derived from nuclear incongruence between trees derived from the two genes; so, we combined nuclear and mitochondrial data
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Low, Steven H.
. Furthermore, un- like the Lasso, the Elastic Net can yield a sparse esti- mate with more than n non-zero477 Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander to regression regulariza- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Blei, David M.
, the Elastic Net can yield a sparse esti- mate with more than n non-zero weights (Efron et al., 2004). One canExploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander Lorbert- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane- ously performs
Wind, Hydrogen and other Energy Technologies Similarities and Differences in Expectation Dynamics
Wind, Hydrogen and other Energy Technologies Similarities and Differences in Expectation Dynamics But mostly a "storytelling" on expectations and wind energy Per Dannemand Andersen Head of Technology Scenarios research programme Risoe National Laboratory per.dannemand@risoe.dk #12;Expectations and Wind
Assisting Web Search Using Query Suggestion Based on Word Similarity Measure and Query Modification
Ng, Yiu-Kai Dennis
. For example, when the word "Tiger" is entered by a user, current web search engines are mostly focusedAssisting Web Search Using Query Suggestion Based on Word Similarity Measure and Query Modification search engines is query suggestion (QS), which assists users in formulating keyword queries by suggesting
Evolution of Nuclear Many-Body Forces with the Similarity Renormalization Group
Jurgenson, E D; Navratil, P; Furnstahl, R J
2009-05-01T23:59:59.000Z
The first practical method to evolve many-body nuclear forces to softened form using the Similarity Renormalization Group (SRG) in a harmonic oscillator basis is demonstrated. When applied to 4He calculations, the two- and three-body oscillator matrix elements yield rapid convergence of the ground-state energy with a small net contribution of the induced four-body force.
by raising CO2 levels around the leaf3 manner conceptually similar to adding a
Collins, James J.
by raising CO2 levels around the leaf3 in a manner conceptually similar to adding a CCM photo- synthetic CO2 fixation. CCMs have evolved independently in cyanobacteria, microalgae and some a series of membrane- based pumps for CO2 and bicarbonate (HCO3 - ), and special microcompartments called
Flexible Information Visualization of Multivariate Data from Biological Sequence Similarity Searches
Chi, Ed Huai-hsin
Flexible Information Visualization of Multivariate Data from Biological Sequence Similarity of other variÂ ables. We present an enhanced system for interactive exploration of this multivariate data. We identify a larger set of useful variables in the information space. The new system involves more
Flexible Information Visualization of Multivariate Data from Biological Sequence Similarity Searches
Chi, Ed Huai-hsin
Flexible Information Visualization of Multivariate Data from Biological Sequence Similarity- ables. We present an enhanced system for interactive exploration of this multivariate data. We identify a larger set of useful variables in the information space. The new system involves more variables, so
Clarke, Steven
and Biochemistry and the Molecular Biology Institute, Paul D. Boyer Hall, University of California, Los Angeles) plants in patterns distinct from those previously seen in winter wheat (Triticum aestivum cv Augusta) is similar to that of winter wheat. Although high levels of activity are found in the seeds of all
Comparison, similarity and simulation in Zaar, a Chadic language of Nigeria
Paris-Sud XI, Université de
Comparison, similarity and simulation in Zaar, a Chadic language of Nigeria Bernard CARON Llacan `similative' in Zaar, a Chadic language spoken south of Bauchi State, in Northern Nigeria. As the Zaar known as Saya, is spoken by about 150 000 speakers in the South of Bauchi State (Nigeria), in the Tafawa
Self-similar asymptotics of solutions to the Navier-Stokes system
Iftimie, DragoÂº
for the Navier-Stokes equations considered either in the whole space Rn , n 2, or in an exterior domain dependsSelf-similar asymptotics of solutions to the Navier-Stokes system in two dimensional exterior Navier-Stokes equations with Dirichlet boundary con- dition in the exterior of one obstacle. Assuming
Finding Similar Documents in Document Collections Thorsten Brants and Reinhard Stolle
Stolle, Reinhard
and managing the collection. In partic ular, the document collections become unwieldy and ulti mately, the automated or computer assisted management of collections of natural language documents requires a fineFinding Similar Documents in Document Collections Thorsten Brants and Reinhard Stolle Palo Alto
Finding Similar Documents in Document Collections Thorsten Brants and Reinhard Stolle
Stolle, Reinhard
and managing the collection. In partic- ular, the document collections become unwieldy and ulti- mately, the automated or computer- assisted management of collections of natural language documents requires a fineFinding Similar Documents in Document Collections Thorsten Brants and Reinhard Stolle Palo Alto
Chernobyl and Fukushima: Differences and Similarities, a Biological Perspective Timothy A. Mousseau1
Mousseau, Timothy A.
Chernobyl and Fukushima: Differences and Similarities, a Biological Perspective Timothy A. Mousseau and animal life of the Chernobyl Exclusion Zone is thriving in the absence of human activity in the region and that much of the human morbidity linked to Chernobyl fallout was largely related to stress and other self
cancer indicates a similar scenario, whereby MET amplification and mutation in the T790
Weiblen, George D
cancer indicates a similar scenario, whereby MET amplification and mutation in the T790 residue- resistant forms of the cancer-associated kinase BCRÂABL have enhanced oncogenicity, there is growing spectrum of cancers, not just those with driver kinase mutations, might be sensitive to cocktails of kinase
Beaucage, Gregory
Polymer Thermodynamics and Chain Structure Polymers display some similarities and some differences with nano-aggregates. Both materials are composed of basic units, Kuhn units for polymers which are rod an aggregate in nanomaterials and a polymer coil in Polymer Science. The mass-fractal or minimum dimension
Self-similar solutions for a fractional thin film equation governing hydraulic fractures
Boyer, Edmond
Self-similar solutions for a fractional thin film equation governing hydraulic fractures C. Imbert equation governing hydraulic fractures are constructed. One of the boundary con- ditions, which accounts, 35R11, 35C06 Keywords: Hydraulic fractures, higher order equation, thin films, fractional Laplacian
Uriarte, Maria
-exclusive mechanisms ranging from entirely deterministic to stochastic have been proposed to explain the high number traits to quantify the relative efficacy of functional similarity and shared ancestry in describing 1971) and limited dispersal coupled with demo- graphic stochasticity (Hubbell 2001). The outcome
Increased lung cancer risks are similar whether arsenic is ingested ALLAN H. SMITHa
California at Berkeley, University of
Increased lung cancer risks are similar whether arsenic is ingested or inhaled ALLAN H. SMITHa that inorganic arsenic was a human lung carcinogen based on studies involving exposure through inhalation. In 2004, IARC listed arsenic in drinking water as a cause of lung cancer, making arsenic the first
Are all Social Networks Structurally Similar? A Comparative Study using Network Statistics and
Paris-Sud XI, Université de
Are all Social Networks Structurally Similar? A Comparative Study using Network Statistics--The modern age has seen an exponential growth of social network data available on the web. Analysis social networks and how they are different from other networks such as protein interaction networks
Similarity Parameter Evolution within a Magnetic Nozzle with Applications to Laboratory Plasmas
Choueiri, Edgar
by which ions are accelerated is fundamental to the understanding of magnetic nozzles for propulsionSimilarity Parameter Evolution within a Magnetic Nozzle with Applications to Laboratory Plasmas IEPC-2011-229 Presented at the 32nd International Electric Propulsion Conference, Wiesbaden, Germany
Elastic Lennard-Jones polymers meet clusters: Differences and similarities Stefan Schnabel,1,a
Bachmann, Michael
Elastic Lennard-Jones polymers meet clusters: Differences and similarities Stefan Schnabel,1,a of elastic flexible off-lattice polymers with Lennard-Jones monomer-monomer interaction and anharmonic and nonicosahedral low-energy polymer morphologies. © 2009 American Institute of Physics. doi:10.1063/1.3223720 I
Dawson, Jeff W.
Similar effects of residential and non-residential vegetation on bird diversity in suburban the Queen in Right of Canada 2013 Abstract Estimating the relative importance of vegetation on residential land (gardens, yards, and street-trees) and vegetation on non-residential land (parks and other large
Sequence Effects in Solving Knowledge-Rich Problems: The Ambiguous Role of Surface Similarities
Paris-Sud XI, Université de
Sequence Effects in Solving Knowledge-Rich Problems: The Ambiguous Role of Surface Similarities Tuebingen, Germany Abstract Sequence effects are said to occur whenever the problem- solving performance sequence effects as a result of (a) learning during solving a problem and of (b) transferring the learned
Beyond Similarity Jay Budzik, Kristian J. Hammond, Larry Birnbaum, and Marko Krema
Bustamante, Fabián E.
Beyond Similarity Jay Budzik, Kristian J. Hammond, Larry Birnbaum, and Marko Krema Intelligent Information Laboratory Northwestern University 1890 Maple Ave. Evanston, IL USA {budzik, hammond, birnbaum (Lieberman 1995, Rhodes and Starner 1996, Badue, Vaz, and Albuquerque 1998, Budzik et al. 1998, Kulyukin 1999
Drug-Target Interaction Prediction for Drug Repurposing with Probabilistic Similarity Logic
Getoor, Lise
Drug-Target Interaction Prediction for Drug Repurposing with Probabilistic Similarity Logic Shobeir, USA getoor@cs.umd.edu ABSTRACT The high development cost and low success rate of drug dis- covery from appro- ved drugs. Computational methods can be effective in focu- sing efforts for such drug repurposing
Brauner, Neima
PREDICTION OF TEMPERATURE-DEPENDENT PROPERTIES BY CORRELATIONS BASED ON SIMILARITY OF MOLECULAR and environmental impact assessment, hazard and operability analysis. Therefore, methods for reliable prediction of property data are needed. In particular, prediction of temperature-dependent properties (like vapor
Fuzzy Classification of Genome Sequences Prior to Assembly Based on Similarity Measures*
Nicolescu, Monica
Fuzzy Classification of Genome Sequences Prior to Assembly Based on Similarity Measures* Sara number: 0447416). Abstract - Nucleotide sequencing of genomic data is an important step towards building into the overall genome. However, the existence of insertions, deletions and substitutions can complicate
1 Plasmodium falciparum SSB Tetramer Wraps 2 Single-Stranded DNA with Similar Topology but
Lohman, Timothy M.
1 Plasmodium falciparum SSB Tetramer Wraps 2 Single-Stranded DNA with Similar Topology but 3 methods, we show that Pf-SSB forms a stable homo-tetramer 32 alone and when bound to single-stranded DNA (ssDNA). We also present a 33 crystal structure at 2.1 Å resolution of the Pf-SSB tetramer bound
Pani, Paolo [Dipartimento di Fisica, Universita di Cagliari, and INFN sezione di Cagliari, Cittadella Universitaria 09042 Monserrato (Italy); Berti, Emanuele [Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677-1848 (United States); Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125 (United States); Cardoso, Vitor [Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677-1848 (United States); Centro Multidisciplinar de Astrofisica-CENTRA, Department de Fisica, Instituto Superior Tecnico, Av. Rovisco Pais 1, 1049-001 Lisboa (Portugal); Chen Yanbei; Norte, Richard [Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125 (United States)
2010-04-15T23:59:59.000Z
We study gravitational wave emission from the quasicircular, extreme mass ratio inspiral of compact objects of mass m{sub 0} into massive objects of mass M>>m{sub 0} whose external metric is identical to the Schwarzschild metric, except for the absence of an event horizon. To be specific we consider one of the simplest realizations of such an object: a nonrotating thin-shell gravastar. The power radiated in gravitational waves during the inspiral shows distinctive peaks corresponding to the excitation of the polar oscillation modes of the gravastar. For ultracompact gravastars the frequency of these peaks depends mildly on the gravastar compactness. For masses M{approx}10{sup 6}M{sub {center_dot}}the peaks typically lie within the optimal sensitivity bandwidth of the Laser Interferometer Space Antenna, potentially providing a unique signature of the horizonless nature of the central object. For relatively modest values of the gravastar compactness the radiated power has even more peculiar features, carrying the signature of the microscopic properties of the physical surface replacing the event horizon.
Seismic amplitude and coherency response of channel sand, offshore Louisiana, Gulf of Mexico
Fischer, Elena Mikhaylovna
1999-01-01T23:59:59.000Z
saturated sandstones. . . . . , . . 19 5 Traditional 3D seismic time slice vs. coherency time slice. . . . . 6 Example of waveform similarity estimation . . . . . . 2 1 22 7 Time slices through a seismic amplitude data volume . . 25 8 Coherency time... difference calculation. . . . . . . . . 51 22 3D difference data cube . 52 23 Amplitude/difference data cube 24 Time-structure map of Horizon A. 54 56 25 Horizon-based difference slice. 57 26 Difference time slice at 1200 ms showing the location...
Random Vortex-Street Model for a Self-Similar Plane Turbulent Jet
Victor L'vov; Anna Pomyalov; Itamar Procaccia; Rama Govindarajan
2008-03-18T23:59:59.000Z
We ask what determines the (small) angle of turbulent jets. To answer this question we first construct a deterministic vortex-street model representing the large scale structure in a self-similar plane turbulent jet. Without adjustable parameters the model reproduces the mean velocity profiles and the transverse positions of the large scale structures, including their mean sweeping velocities, in a quantitative agreement with experiments. Nevertheless the exact self similar arrangement of the vortices (or any other deterministic model) necessarily leads to a collapse of the jet angle. The observed (small) angle results from a competition between vortex sweeping tending to strongly collapse the jet and randomness in the vortex structure, with the latter resulting in a weak spreading of the jet.
On the Cosmic Nuclear Cycle and the Similarity of Nuclei and Stars
O. Manuel; Michael Mozina; Hilton Ratcliffe
2005-11-18T23:59:59.000Z
Repulsive interactions between neutrons in compact stellar cores cause luminosity and a steady outflow of hydrogen from stellar surfaces. Neutron repulsion in more massive compact objects made by gravitational collapse produces violent, energetic, cosmological events (quasars, gamma ray bursts, and active galactic centers) that had been attributed to black holes before neutron repulsion was recognized. Rather than evolving in one direction by fusion, nuclear matter on the cosmological scale cycles between fusion, gravitational collapse, and dissociation (including neutron-emission). This cycle involves neither the production of matter in an initial Big Bang nor the disappearance of matter into black holes. The similarity Bohr noted between atomic and planetary structures extends to a similarity between nuclear and stellar structures.
Eta Carinae and Nebulae Around Massive Stars: Similarities to Planetary Nebulae?
Nathan Smith
2008-02-13T23:59:59.000Z
I discuss some observational properties of aspherical nebulae around massive stars, and conclusions inferred for how they may have formed. Whether or not these ideas are applicable to the shaping of planetary nebulae is uncertain, but the observed similarities between some PNe and bipolar nebulae around massive stars is compelling. In the well-observed case of Eta Carinae, several lines of observational evidence point to a scenario where the shape of its bipolar nebula resulted from an intrinsically bipolar explosive ejection event rather than an interacting winds scenario occurring after ejection from teh star. A similar conclusion has been inferred for some planetary nebulae. I also briefly mention bipolar nebulae around some other massive stars, such as the progenitor of SN 1987A and related blue supergiants.
Quasi-ASICs: Trading Area for Energy by Exploiting Similarity in Synthesized Cores for Irregular efficiency, to scale system per- Decreasing Area Budget 1 0.95 0.9 0.85 0.8 0.75 EnergyEfficiency 1 3 5 7 9 11 Fully-Specialized Logic QASICs Figure 1. Trade offs between area and energy efficiency The x- axis
Flux-linkage equations for 7-winding representation (similar to eq. 4.11 in text)
McCalley, James D.
1 Flux-linkage equations for 7-winding representation (similar to eq. 4.11 in text=MDcos(-120Â°) Lbc=-[Ms+Lmcos2(-90Â°)] LbD=MDcos(-120Â°) LDc=MDcos(-240Â°) LbQ=MQsin(-120Â°) Lca=-[Ms+Lmcos2 is not coupled with any other circuit. We can write a voltage equation for each of the phase windings as follows
The Magnus expansion and the in-medium similarity renormalization group
Morris, T. D.; Bogner, S. K. [National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48844 (United States)
2014-10-15T23:59:59.000Z
We present a variant of the in-medium similarity renormalization group(IMSRG) based on the Magnus expansion. In this new variant, the unitary transformation of the IMSRG is constructed explicitly, which allows for the transformation of observables quickly and easily. Additionally, the stiffness of equations encountered by the traditional solution of the IMSRG can be alleviated greatly. We present results and comparisons for the 3d electron gas.
Hooper, Sean D.; Anderson, Iain J; Pati, Amrita; Dalevi, Daniel; Mavromatis, Konstantinos; Kyrpides, Nikos C
2009-01-01T23:59:59.000Z
In order to simplify and meaningfully categorize large sets of protein sequence data, it is commonplace to cluster proteins based on the similarity of those sequences. However, it quickly becomes clear that the sequence flexibility allowed a given protein varies significantly among different protein families. The degree to which sequences are conserved not only differs for each protein family, but also is affected by the phylogenetic divergence of the source organisms. Clustering techniques that use similarity thresholds for protein families do not always allow for these variations and thus cannot be confidently used for applications such as automated annotation and phylogenetic profiling. In this work, we applied a spectral bipartitioning technique to all proteins from 53 archaeal genomes. Comparisons between different taxonomic levels allowed us to study the effects of phylogenetic distances on cluster structure. Likewise, by associating functional annotations and phenotypic metadata with each protein, we could compare our protein similarity clusters with both protein function and associated phenotype. Our clusters can be analyzed graphically and interactively online.
Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids ?
Marsset, Michaël; Gourgeot, Florian; Dumas, Christophe; Birlan, Mirel; Lamy, Philippe; Binzel, Richard P
2014-01-01T23:59:59.000Z
Hilda asteroids and Jupiter Trojans are two low-albedo (p$_{\\rm v}$ ~ 0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, recent surveys by WISE and the Spitzer Space Telescope (SST) have revealed that ~2% of these objects possess high albedos (p$_{\\rm v}$ > 0.15), which might indicate interlopers - that is, objects not formed in the Kuiper Belt - among these two populations. Here, we report spectroscopic observations in the visible and/or near-infrared spectral ranges of twelve high-albedo (p$_{\\rm v}$ > 0.15) Hilda asteroids and Jupiter Trojans. These twelve objects have spectral properties similar to those of the low- albedo population, which suggests a similar composition and hence a similar origin for low- and high-albedo Hilda asteroids and Jupiter Trojans. We therefore propose that most high albedos probably result from statistical bias or uncertainties that affect the WISE and SST measurements. However, some of the high albedos may be true and t...
Quantum time uncertainty in Schwarzschild-anti-de Sitter black holes
Galan, Pablo; Mena Marugan, Guillermo A. [Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid (Spain); Garay, Luis J. [Departamento de Fisica Teorica II, Universidad Complutense de Madrid, 28040 Madrid (Spain); Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid (Spain)
2007-08-15T23:59:59.000Z
The combined action of gravity and quantum mechanics gives rise to a minimum time uncertainty in the lowest order approximation of a perturbative scheme, in which quantum effects are regarded as corrections to the classical spacetime geometry. From the nonperturbative point of view, both gravity and quantum mechanics are treated on equal footing in a description that already contains all possible backreaction effects as those above in a nonlinear manner. In this paper, the existence or not of such minimum time uncertainty is analyzed in the context of Schwarzschild-anti-de Sitter black holes using the isolated horizon formalism. We show that from a perturbative point of view, a nonzero time uncertainty is generically present owing to the energy scale introduced by the cosmological constant, while in a quantization scheme that includes nonperturbatively the effects of that scale, an arbitrarily high time resolution can be reached.
Davis, Trisha N.
-76) and yTR2 (residues 75-147) are similar to the vertebrate CaM fragments TR1 and TR2, which are generated- affinity sites (dissociation constants were 5.2, 3.3, and 2.3 pM in the presence of 1 mM MgC12 and 100 mCaM residues75-147; TnC, troponin C; NMR, nuclear magnetic resonance; lD, one dimensional; 2D, two dimensional
The Dimensions Of Self-Similar Sets Wenxia Li, Dongmei Xiao
Li, Wenxia
of California at Berkeley, CA 94720, USA. Abstract For self-similar set F we prove that dimH F = dimB F = dimP FHF = dimBF = dimP F = s and F is an s-set where s is such that n i=1 cs i = 1, (2) if i's satisfy the open of the choice of A and 0(A) = 0(A).We denote the common value by 0; (ii) dimHF = dimBF = dimP F = 0s; (For self
Sanfilippo, Antonio P.; Posse, Christian; Gopalan, Banu; Tratz, Stephen C.; Gregory, Michelle L.
2006-06-08T23:59:59.000Z
With the rising influence of the Gene On-tology, new approaches have emerged where the similarity between genes or gene products is obtained by comparing Gene Ontology code annotations associ-ated with them. So far, these approaches have solely relied on the knowledge en-coded in the Gene Ontology and the gene annotations associated with the Gene On-tology database. The goal of this paper is to demonstrate that improvements to these approaches can be obtained by integrating textual evidence extracted from relevant biomedical literature.
Differences and similarities in the analysis of Lorenz, Chen, and Lu systems
G. A. Leonov; N. V. Kuznetsov
2014-09-27T23:59:59.000Z
Currently it is being actively discussed the question of the equivalence of various Lorenz-like systems and the possibility of universal consideration of their behavior, in view of the possibility of reduction of such systems to the same form with the help of various transformations. In the present paper the differences and similarities in the analysis of the Lorenz, the Chen and the Lu systems are discussed and it is shown that the Chen and the Lu systems are valuable for the development of new methods for the analysis of chaotic systems.
Kowalski, Karol; Bhaskaran-Nair, Kiran; Shelton, William A.
2014-09-07T23:59:59.000Z
In this paper we discuss a new formalism for producing an analytic coupled-cluster (CC) Green’s function that renders a highly scalable computational accurate method for producing an analytic coupled-cluster Green’s function for an N-electron system by shifting the poles of similarity transformed Hamiltonians represented in N?1 and N +1 electron Hilbert spaces. Simple criteria are derived for the states in N ?1 and N + 1 electron spaces that are then corrected in the spectral resolution of the cor- responding matrix representations of the similarity transformed Hamiltonian. The accurate description of excited state processes within a Green’s function formalism would be of significant importance to a number of scientific communities ranging from physics and chemistry to engineering and the biological sciences. This is because the Green’s function methodology provides a direct path for not only calculating prop- erties whose underlying origins come from coupled many-body interactions but it also provides a straightforward path for calculating electron transport, response and correlation functions that allows for a direct link with experiment. As a special case of this general formulation, we discuss the application of this technique for Green’s function defined by the CCSD (CC with singles and doubles) representation of the ground-state wave function.
Leptonic CP Violation Phases, Quark-Lepton Similarity and Seesaw Mechanism
Basudeb Dasgupta; Alexei Yu. Smirnov
2014-05-20T23:59:59.000Z
We explore generic features of the leptonic CP violation in the framework of the seesaw type I mechanism with similarity of the Dirac lepton and quarks mass matrices $m_D$. For this, we elaborate on the standard parametrization conditions which allow to simultaneously obtain the Dirac and Majorana phases. If the only origin of CP violation is the left-handed (LH) transformation which diagonalizes $m_D$ (similar to quarks), the leptonic CP violation is suppressed and the Dirac phase is close to $\\pi$ or to $0$ with $\\sin \\delta_{CP} \\approx (\\sin \\theta_{13}^q /\\sin \\theta_{13}) \\cos \\theta_{23} \\sin \\delta_q \\sim \\lambda^2 \\sin \\delta_q$. Here $\\lambda \\sim \\theta_C$, is the Cabibbo mixing angle, and $\\theta_{13}^q$ and $\\theta_{13}$ are the 1-3 mixing angles of quarks and leptons respectively. The Majorana phases $\\beta_1$ and $\\beta_2$ are suppressed as $\\lambda^3\\sin\\delta_q$. For Majorana neutrinos implied by seesaw, the right-handed (RH) transformations are important. We explore the simplest extension inspired by Left-Right (L-R) symmetry with small CKM-type CP violation. In this case, seesaw enhancement of the CP violation occurs due to strong hierarchy of the eigenvalues of $m_D$ leading to $\\delta_{CP} \\sim 1$. The enhancement is absent under the phase factorization conditions which require certain relations between parameters of the Majorana mass matrix of RH neutrinos.
Tanha, Matteus; Cappiello, Alex; Gordon, Geoffrey J; Yaron, David J
2013-01-01T23:59:59.000Z
A means to take advantage of molecular similarity to lower the computational cost of electronic structure theory is proposed, in which parameters are embedded into a low-cost, low-level (LL) ab initio theory and adjusted to obtain agreement with a higher level (HL) ab initio theory. This approach is explored by training such a model on data for ethane and testing the resulting model on methane, propane and butane. The electronic distribution of the molecules is varied by placing them in strong electrostatic environments consisting of random charges placed on the corners of a cube. The results find that parameters embedded in HF/STO-3G theory can be adjusted to obtain agreement, to within about 2 kcal/mol, with results of HF/6-31G theory. Obtaining this level of agreement requires the use of parameters that are functions of the bond lengths, atomic charges, and bond orders within the molecules. The argument is made that this approach provides a well-controlled means to take advantage of molecular similarity in...
Self-similar cosmological solutions with dark energy I: formulation and asymptotic analysis
Harada, Tomohiro; Carr, B J
2007-01-01T23:59:59.000Z
Based on the asymptotic analysis of ordinary differential equations, we classify all spherically symmetric self-similar solutions to the Einstein equations which are asymptotically Friedmann at large distances and contain a perfect fluid with equation of state $p=(\\gamma -1)\\mu$ with $01$). However, in the latter case there is an additional parameter associated with the weak discontinuity at the sonic point and the solutions are only asymptotically ``quasi-Friedmann'', in the sense that they exhibit an angle deficit at large distances. In the $0<\\gamma<2/3$ case, there is no sonic point and there exists a one-parameter family of solutions which are {\\it genuinely} asymptotically Friedmann at large distances. We find eight classes of asymptotic behavior: Friedmann or quasi-Friedmann or quasi-static or constant-velocity at large distances, quasi-Friedmann or positive-mass singular or negative-mass singular at small distances, or quasi-Kantowski-Sachs at intermediate distances. The self-similar asymptotica...
A primordial origin for the composition similarity between the Earth and the Moon
Mastrobuono-Battisti, Alessandra; Raymond, Sean N
2015-01-01T23:59:59.000Z
Most of the properties of the Earth-Moon system can be explained by a collision between a planetary embryo and the growing Earth late in the accretion process. Simulations show that most of the material that eventually aggregates to form the Moon originates from the impactor. However, analysis of the terrestrial and lunar isotopic composition show them to be highly similar. In contrast, the compositions of other solar system bodies are significantly different than the Earth and Moon. This poses a major challenge to the giant impact scenario since the Moon-forming impactor is then thought to also have differed in composition from the proto-Earth. Here we track the feeding zones of growing planets in a suite of simulations of planetary accretion, in order to measure the composition of Moon-forming impactors. We find that different planets formed in the same simulation have distinct compositions, but the compositions of giant impactors are systematically more similar to the planets they impact. A significant fra...
Mateas, Michael
Mateas, M. 2005. Procedural Literacy: Educating the New Media Practitioner. On The Horizon. Special Literacy: Educating the New Media Practitioner Michael Mateas Abstract For humanities scholars, artists on the theoretical and aesthetic concerns of new media. New media scholars and practitioners, including game
Time-Energy Costs of Quantum Measurements
Chi-Hang Fred Fung; H. F. Chau
2014-05-08T23:59:59.000Z
Time and energy of quantum processes are a tradeoff against each other. We propose to ascribe to any given quantum process a time-energy cost to quantify how much computation it performs. Here, we analyze the time-energy costs for general quantum measurements, along a similar line as our previous work for quantum channels, and prove exact and lower bound formulae for the costs. We use these formulae to evaluate the efficiencies of actual measurement implementations. We find that one implementation for a Bell measurement is optimal in time-energy. We also analyze the time-energy cost for unambiguous state discrimination and find evidence that only a finite time-energy cost is needed to distinguish any number of states.
Annual Graduate Student Symposium Schedule Time Presenter Title
Meyers, Steven D.
of the Mississippi River Diversions During the Deepwater Horizon Oil Spill 10:1510:30 am Rebekka Larson Shifts Petroleum Dispersal and Partitioning After the Deepwater Horizon Blowout 99:15 am Robert Ulrich Grouper in Depositional Patterns in the NE Gulf of Mexico Following the 2010 BP Blowout Event: Stratigraphy
Orioli, A Pineiro; Berges, J
2015-01-01T23:59:59.000Z
We investigate universal behavior of isolated many-body systems far from equilibrium, which is relevant for a wide range of applications from ultracold quantum gases to high-energy particle physics. The universality is based on the existence of nonthermal fixed points, which represent nonequilibrium attractor solutions with self-similar scaling behavior. The corresponding dynamic universality classes turn out to be remarkably large, encompassing both relativistic as well as nonrelativistic quantum and classical systems. For the examples of nonrelativistic (Gross-Pitaevskii) and relativistic scalar field theory with quartic self-interactions, we demonstrate that infrared scaling exponents as well as scaling functions agree. We perform two independent nonperturbative calculations, first by using classical-statistical lattice simulation techniques and second by applying a vertex-resummed kinetic theory. The latter extends kinetic descriptions to the nonperturbative regime of overoccupied modes. Our results open ...
Self-similar condensation of rotating magnetized self-gravitating isothermal filaments
P. Hennebelle
2002-10-18T23:59:59.000Z
Ordinary differential equations describing the self-similar collapse of a rotating, magnetized, self-gravitating and isothermal filament are derived. Explicit homologous solutions are studied with special emphasis on the bifurcation that occurs at the magnetosonic critical point. It is shown that there is a critical value for the toroidal magnetic field slope at the origin above which no bifurcation occurs, the solution remains homologous, and below which the density and the poloidal magnetic field tend to zero at large radius (envelope) whereas the toroidal magnetic field and azimuthal velocity relax towards a constant value. A series of spatial profiles of density, velocity and magnetic field, potentially useful for comparison with numerical or observational studies, is obtained numerically and discussed.
Pitman, Jim
2008-01-01T23:59:59.000Z
We use a natural ordered extension of the Chinese Restaurant Process to grow a two-parameter family of binary self-similar continuum fragmentation trees. We provide an explicit embedding of Ford's sequence of alpha model trees in the continuum tree which we identified in a previous article as a distributional scaling limit of Ford's trees. In general, the Markov branching trees induced by the two-parameter growth rule are not sampling consistent, so the existence of compact limiting trees cannot be deduced from previous work on the sampling consistent case. We develop here a new approach to establish such limits, based on regenerative interval partitions and the urn-model description of sampling from Dirichlet random distributions.
Method for recycling tires and similarly compounded materials to recover usable constituents
Letsch, W.
1980-12-23T23:59:59.000Z
A processing plant and method are described for processing scrap tires and similar materials containing a mixture of technical rubber, scrap metal and tire cord in which the plant is essentially vehicular and thus eliminates the necessity of hauling accumulated tires long distances with the accompanying costs. The plant includes means for directing mixed tire sizes to a cyrogenic section where the technical rubber is reduced to a sufficient temperature making it brittle so that initial separation of reusable technical rubber is accomplished; the plant is operated essentially on the reusable by-products of pyrolytic reduction of the tires so that hydrocarbons and heated gas are utilized and additional commercial by-products such as commercial soots, metal and tire beads are obtained.
Analytical model of brittle destruction based on hypothesis of scale similarity
Arakcheev, A. S., E-mail: asarakcheev@gmail.com; Lotov, K. V. [Russian Academy of Sciences, Budker Institute of Nuclear Physics, Siberian Branch (Russian Federation)
2012-08-15T23:59:59.000Z
The size distribution of dust particles in thermonuclear (fusion) devices is closely described by a power law, which may be related to the brittle destruction of materials. The hypothesis of scale similarity leads to the conclusion that the size distribution of particles formed as a result of a brittle destruction is described by a power law with the exponent -{alpha} that can range from -4 to -1. The model of brittle destruction is described in terms of the fractal geometry, and the distribution exponent is expressed via the fractal dimension of packing. Under additional assumptions, it is possible to refine the {alpha} value and, vice versa, to determine the type of destruction using the measured size distribution of particles.
Benli, Mustafa G
2013-07-22T23:59:59.000Z
and f0; : : : ; fd 1 determine how it acts on the subtrees hanging down the rst level vertices. The following equations are easy to observe from the de nitions: (fu)v = fuv for all u; v 2 X ; (fg)u = f g(u)gu for all f; g 2 Aut(X ); u 2 X ; fg...-coordinates of n( ), we have n(g) = (n)g ; (gv)v2Xn 2 S(n)d oXn G = Sd o n G for all g 2 G. Note that (n)g = (1)g ; (n 1)gx x2X 2 Sd o S (n 1) d = S (n) d (2.6) 9 for all g 2 G and n 1. A self-similar group (G; ) of degree d de nes...
Resnik, P
2011-01-01T23:59:59.000Z
This article presents a measure of semantic similarity in an IS-A taxonomy based on the notion of shared information content. Experimental evaluation against a benchmark set of human similarity judgments demonstrates that the measure performs better than the traditional edge-counting approach. The article presents algorithms that take advantage of taxonomic similarity in resolving syntactic and semantic ambiguity, along with experimental results demonstrating their effectiveness.
J Mecinovic; P Snyder; K Mirica; S Bai; E Mack; R Kwant; D Moustakas; A Heroux; G Whitesides
2011-12-31T23:59:59.000Z
The hydrophobic effect, the free-energetically favorable association of nonpolar solutes in water, makes a dominant contribution to binding of many systems of ligands and proteins. The objective of this study was to examine the hydrophobic effect in biomolecular recognition using two chemically different but structurally similar hydrophobic groups, aliphatic hydrocarbons and aliphatic fluorocarbons, and to determine whether the hydrophobicity of the two groups could be distinguished by thermodynamic and biostructural analysis. This paper uses isothermal titration calorimetry (ITC) to examine the thermodynamics of binding of benzenesulfonamides substituted in the para position with alkyl and fluoroalkyl chains (H{sub 2}NSO{sub 2}C{sub 6}H{sub 4}-CONHCH{sub 2}(CX{sub 2}){sub n}CX{sub 3}, n = 0-4, X = H, F) to human carbonic anhydrase II (HCA II). Both alkyl and fluoroalkyl substituents contribute favorably to the enthalpy and the entropy of binding; these contributions increase as the length of chain of the hydrophobic substituent increases. Crystallography of the protein-ligand complexes indicates that the benzenesulfonamide groups of all ligands examined bind with similar geometry, that the tail groups associate with the hydrophobic wall of HCA II (which is made up of the side chains of residues Phe131, Val135, Pro202, and Leu204), and that the structure of the protein is indistinguishable for all but one of the complexes (the longest member of the fluoroalkyl series). Analysis of the thermodynamics of binding as a function of structure is compatible with the hypothesis that hydrophobic binding of both alkyl and fluoroalkyl chains to hydrophobic surface of carbonic anhydrase is due primarily to the release of nonoptimally hydrogen-bonded water molecules that hydrate the binding cavity (including the hydrophobic wall) of HCA II and to the release of water molecules that surround the hydrophobic chain of the ligands. This study defines the balance of enthalpic and entropic contributions to the hydrophobic effect in this representative system of protein and ligand: hydrophobic interactions, here, seem to comprise approximately equal contributions from enthalpy (plausibly from strengthening networks of hydrogen bonds among molecules of water) and entropy (from release of water from configurationally restricted positions).
ccsd-00000995(version1):5Jan2004 The genealogy of self-similar fragmentations with negative
Paris-Sud XI, Université de
ccsd-00000995(version1):5Jan2004 The genealogy of self-similar fragmentations with negative index power, called the index of the self-similar fragmentation. A genealogy is naturally associated of the fragments, one guesses that there should be a natural way to define a genealogy tree, rooted at the initial
Inkpen, Diana
Second Order Co-occurrence PMI for Determining the Semantic Similarity of Words Md. Aminul Islam for calculating the semantic similarity of two target words. Our method, called Second Order Co-occurrence PMI (SOC-PMI), uses Pointwise Mutual Information to sort lists of important neighbor words of the two
The infrared limit of the Similarity Renormalization Group evolution and Levinson's theorem
E. Ruiz Arriola; S. Szpigel; V. S. Timoteo
2014-04-19T23:59:59.000Z
On a finite momentum grid with N integration points and weights the Similarity Renormalization Group (SRG) with a given generator G unitarily evolves an initial interaction with a cutoff on energy differences. This steadily drives the starting Hamiltonian in momentum space to a diagonal form in the infrared limit corresponding to a permutation of the eigenvalues and depends on G. Levinson's theorem establishes a relation between phase-shifts and the number of bound-states. We show that unitarily equivalent Hamiltonians on the grid generate reaction matrices which are compatible with Levinson's theorem but are phase-inequivalent along the SRG trajectory. An isospectral definition of the phase-shift in terms of an energy-shift is possible but requires in addition a proper ordering of states on a momentum grid in order to fulfill Levinson's theorem. We show how the SRG with different generators G induces different isospectral flows in the presence of bound-states, leading to distinct orderings in the infrared limit. While the Wilson generator induces an ascending ordering incompatible with Levinson's theorem, the Wegner generator provides a much better ordering, although not the optimal one. We illustrate the discussion with the nucleon-nucleon (NN) interaction in the 1S0 and 3S1 channels.
Sharp, Jonathan; Schofield, Eleanor J.; Veeramani, Harish; Suvorova, Elena; Kennedy, David W.; Marshall, Matthew J.; Mehta, Apurva; Bargar, John R.; Bernier-Latmani, Rizlan
2009-11-01T23:59:59.000Z
While the product of microbial uranium reduction is often reported to be“UO2”, a comprehensive characterization including stoichiometry and unit cell determination is available for only one Shewanella species. Here, we compare the products of batch uranyl reduction by a collection of dissimilatory metal- and sulfate-reducing bacteria of the genera Shewanella, Geobacter, Anaeromyxobacter, and Desulfovibrio under similar laboratory conditions. Our results demonstrate that U(VI) bioreduction by this assortment of commonly studied, environmentally relevant bacteria leads to the precipitation of uraninite with a composition between UO2.00 and UO2.075, regardless of phylogenetic or metabolic diversity. Coupled analyses, including electron microscopy, X-ray absorption spectroscopy, and powder diffraction, confirm that structurally and chemically analogous uraninite solids are produced. These biogenic uraninites have particle diameters of about 2-3 nm and lattice constants consistent with UO2.0 and exhibit a high degree of intermediate-range order. Results indicate that phylogenetic and metabolic variability within delta- and gamma-proteobacteria has little effect on nascent biouraninite structure or crystal size under the investigated conditions.
Hwang, Chiachi; Wu, Weimin; Gentry, Terry J.; Carley, Jack; Corbin, Gail A.; Carroll, Sue L.; Watson, David B.; Jardine, Phil M.; Zhou, Jizhong; Criddle, Craig S.; Fields, Matthew W.
2009-05-22T23:59:59.000Z
Bacterial community succession was investigated in a field-scale subsurface reactor formed by a series of wells that received weekly ethanol additions to re-circulating groundwater. Ethanol additions stimulated denitrification, metal reduction, sulfate reduction, and U(VI) reduction to sparingly soluble U(IV). Clone libraries of SSU rRNA gene sequences from groundwater samples enabled tracking of spatial and temporal changes over a 1.5 y period. Analyses showed that the communities changed in a manner consistent with geochemical variations that occurred along temporal and spatial scales. Canonical correspondence analysis revealed that the levels of nitrate, uranium, sulfide, sulfate, and ethanol strongly correlated with particular bacterial populations. As sulfate and U(VI) levels declined, sequences representative of sulfate-reducers and metal-reducers were detected at high levels. Ultimately, sequences associated with sulfate-reducing populations predominated, and sulfate levels declined as U(VI) remained at low levels. When engineering controls were compared to the population variation via canonical ordination, changes could be related to dissolved oxygen control and ethanol addition. The data also indicated that the indigenous populations responded differently to stimulation for bio-reduction; however, the two bio-stimulated communities became more similar after different transitions in an idiosyncratic manner. The strong associations between particular environmental variables and certain populations provide insight into the establishment of practical and successful remediation strategies in radionuclide-contaminated environments with respect to engineering controls and microbial ecology.
Similarities of host defense mechanisms against pulmonary infectious disease in animals and man
Green, G.M.
1984-01-01T23:59:59.000Z
Evidence linking exposure to air pollutants with increased susceptibility to infectious diseases in humans comes from epidemiological, clinical, and experimental laboratory studies. The data suggest that the most common, and perhaps the most sensitive, index of the pulmonary effect of air pollutant exposure is on post upper respiratory infection, prolonged cough, phlegm, and purulent sputum. Experimental models of these relationships for extrapolation to humans should be able to measure such minor changes in symptomatology and physiology rather than require major lethal events. The bacterial aerosol model for quantifying nonspecific defense mechanisms of the bronchopulmonary tree utilizing nonpathogenic organisms fulfills this criterion. The function of the six major components of pulmonary antimicrobial defense mechanisms - including aerodynamic filtration, secretory respiratory tract fluid, fluid transport at the alveolar and bronchial levels, the phagocytic function of alveolar macrophages, the augmenting mechanisms of blood-derived inflammatory cells, and the secretory and cellular-specific immune mechanisms and their mediator products - can all be quantified by this experimental animal model system. The defensive functions are remarkably similar across animal species, and available human data suggest that findings obtained using the model may be extrapolatred to humans.
Embedding parameters in ab initio theory to develop approximations based on molecular similarity
Tanha, Matteus; Kaul, Shiva; Cappiello, Alexander; Gordon, Geoffrey J; Yaron, David J
2015-01-01T23:59:59.000Z
A means to take advantage of molecular similarity to lower the computational cost of electronic structure theory is explored, in which parameters are embedded into a low-cost, low-level (LL) ab initio model and adjusted to obtain agreement with results from a higher-level (HL) ab initio model. A parametrized LL (pLL) model is created by multiplying selected matrix elements of the Hamiltonian operators by scaling factors that depend on element types. Various schemes for applying the scaling factors are compared, along with the impact of making the scaling factors linear functions of variables related to bond lengths, atomic charges, and bond orders. The models are trained on ethane and ethylene, substituted with -NH2, -OH and -F, and tested on substituted propane, propylene and t-butane. Training and test datasets are created by distorting the molecular geometries and applying uniform electric fields. The fitted properties include changes in total energy arising from geometric distortions or applied fields, an...
Structurally Similar but Functionally Diverse ZU5 Domains in Human Erythrocyte Ankyrin
Yasunaga, Mai; Ipsaro, Jonathan J.; Mondragón, Alfonso (NWU)
2014-10-02T23:59:59.000Z
The metazoan cell membrane is highly organized. Maintaining such organization and preserving membrane integrity under different conditions are accomplished through intracellular tethering to an extensive, flexible protein network. Spectrin, the principal component of this network, is attached to the membrane through the adaptor protein ankyrin, which directly bridges the interaction between {beta}-spectrin and membrane proteins. Ankyrins have a modular structure that includes two tandem ZU5 domains. The first domain, ZU5A, is directly responsible for binding {beta}-spectrin. Here, we present a structure of the tandem ZU5 repeats of human erythrocyte ankyrin. Structural and biophysical experiments show that the second ZU5 domain, ZU5B, does not participate in spectrin binding. ZU5B is structurally similar to the ZU5 domain found in the netrin receptor UNC5b supramodule, suggesting that it could interact with other domains in ankyrin. Comparison of several ZU5 domains demonstrates that the ZU5 domain represents a compact and versatile protein interaction module.
Xu, G. S.; Wan, B. N.; Zhang, W. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)
2006-08-15T23:59:59.000Z
Multiresolution property of wavelet analysis makes it a powerful tool in describing turbulent signals. Plasma turbulence similar to its fluid turbulence counterpart shows a degree of self-similarity, intermittency, and multifractal. The multiresolution analysis technique based on a biorthogonal wavelet was applied to the Langmuir probe data to study the self-similarity and the intermittency of plasma fluctuations. The data were collected in the plasma edge region of the HT-7 superconducting tokamak. It is found that plasma turbulence is composed of multiscale eddies; these eddies are similar in structure between different scales; the coexistence of multiscale eddies results in the self-similarity in plasma fluctuations. Large-scale turbulence eddies intermittently burst out; the superposition of these large-scale eddies with those small ones is found responsible for the intermittency behavior. Success of utilizing wavelet multiresolution analysis in the HT-7 tokamak suggests it is a promising technique in the understanding of the turbulence structures.
Long Characteristic Method in Space and Time for Transport Problems
Pandya, Tara M.
2010-07-14T23:59:59.000Z
, this STLC method produces a time-dependent diffusion solution in the thick diffusive limit that is accurate to O(E) and is similar to a continuous linear FEM discretization method in space with time differencing. Application of this method in parallel looks...
A Control Chart Approach for Representing and Mining Data Streams with Shape Based Similarity
Omitaomu, Olufemi A [ORNL] [ORNL
2014-01-01T23:59:59.000Z
The mining of data streams for online condition monitoring is a challenging task in several domains including (electric) power grid system, intelligent manufacturing, and consumer science. Considering a power grid application in which thousands of sensors, called the phasor measurement units, are deployed on the power grid network to continuously collect streams of digital data for real-time situational awareness and system management. Depending on design, each sensor could stream between ten and sixty data samples per second. The myriad of sensory data captured could convey deeper insights about sequence of events in real-time and before major damages are done. However, the timely processing and analysis of these high-velocity and high-volume data streams is a challenge. Hence, a new data processing and transformation approach, based on the concept of control charts, for representing sequence of data streams from sensors is proposed. In addition, an application of the proposed approach for enhancing data mining tasks such as clustering using real-world power grid data streams is presented. The results indicate that the proposed approach is very efficient for data streams storage and manipulation.
Time-Frequency Analysis as Probabilistic Inference
Turner, Richard E.
2014-11-06T23:59:59.000Z
(see supplementary material). The computational complexity is determined by the cost of the Kalman smoother to be . In practice, optimization of the likelihood by the conjugate gradient algorithm converged far more quickly than alternatives like... -varying) signal-de- pendent adaptation of the representation. Similarly, corruption of a signal by noise or missing samples should introduce uncer- tainty into the values of the time-frequency representation; but again, no unified robust method exists...
Clark-Lowes, D.D. (Scott Pickford and Associates Ltd., Surrey (England))
1988-08-01T23:59:59.000Z
From field studies in southwest Libya and northwest Saudi Arabia, the facies of the Paleozoic succession of the north African/Arabian stable cratonic margin of Gondwanaland are interpreted as fluvial, estuarine, deltaic, shallow marine, and glacial deposits. The facies of the Saq and Tabuk Formations of Saudi Arabia bear witness to a sedimentary history that is very similar to that of north Africa, the Saq Formation (Cambrian-Arenig) being equivalent to the Hassaouna Formation of Libya and the Tabuk Formation being subdivided and correlated using well-dated shale members to the following formations: Haouaz (Llanvirn-Llandeilo), Melez-Chograne (Caradoc), Memouniat (Ashgill), Tanezzuft/Acacus (Llandovery-Ludlow), and Tadrart (Gedinnian -Emsian). The Cambrian-Ordovician succession comprises Nubian-type fluvial and estuarine sandstones which pass up to regressive deltaic/shallow marine sequences overlain by Upper Ordovician glacial deposits that lie in deeply incised paleovalleys recorded from Saudi Arabia and north Africa. The Silurian succession comprises the deposits of a postglacial marine transgression of vast lateral extent and a subsequent regression, the sandstones of which are markedly diachronous. The Lower Devonian succession comprises fining-upward retrogradational deltaic (transgressive) sequences of Nubian-type sandstones (fluvial to shallow marine) which form widespread blanket sandstone bodies. The prospectivity of these strata is well known from Algeria in the west to Jordan in the east, the Llandoverian oil-prone source rocks providing the key to Cambrian-Ordovician and Lower Devonian plays. The significance of underlying paleovalley-fill fluvioglacial sandstones as linear reservoir targets has yet to be fully appreciated.
Cosmological entropy production and viscous processes in the (1+3+6)-dimensional space-times
Kenji Tomita
2014-05-23T23:59:59.000Z
The cosmological entropy production is studied in the (1+3+6)-dimensional space-times consisting of the outer space (the 3-dimensional expanding section) and the inner space (the 6-dimensional section). The inner space expands initially and contracts later. First it is shown how the production of the 3-dimensional entropy S_3 within the horizon is strengthened by the dissipation due to viscous processes between the two spaces, in which we consider the viscosity caused by the gravitational-wave transport. Next it is shown under what conditions we can have the critical epoch when S_3 reaches the value 10^{88} in the Guth level and at the same time the outer space is decoupled from the inner space. Moreover, the total entropy S_9 in the 9-dimensional space at the primeval expanding stage is also shown corresponding to S_3.
Lightweight Time Modeling in Timed Creol
Bjørk, Joakim; Owe, Olaf; Schlatte, Rudolf; 10.4204/EPTCS.36.4
2010-01-01T23:59:59.000Z
Creol is an object-oriented modeling language in which inherently concurrent objects exchange asynchronous method calls. The operational semantics of Creol is written in an actor-based style, formulated in rewriting logic. The operational semantics yields a language interpreter in the Maude system, which can be used to analyze models. Recently, Creol has been applied to the modeling of systems with radio communication, such as sensor systems. With radio communication, messages expire and, if sent simultaneously, they may collide in the air. In order to capture these and other properties of distributed systems, we extended Creol's operational semantics with a notion of time. We exploit the framework of a language interpreter to use a lightweight notion of time, in contrast to that needed for a general purpose specification language. This paper presents a timed extension of Creol, including the semantics and the implementation strategy, and discusses its properties using an extended example. The approach can be...
Coles, Henry C.
2012-01-01T23:59:59.000Z
is Just Prior to Cooling Air Entering IT Equipment FigureGadgil, A.J. and Tschudi, W.F. , Air Corrosivity in U.S.Outdoor-Air-Cooled Data Centers is Similar to That in
Arslanyilmaz, Abdurrahman
2009-05-15T23:59:59.000Z
This study investigates the use of authentic subtitled similar task videos (ASSTVs) and their relationship to second language negotiation of meaning and language production among non-native speakers of English in an online task-based language...
Noncommutative Two Time Physics
W. Chagas-Filho
2006-05-10T23:59:59.000Z
We present a classical formalism describing two-time physics with Abelian canonical gauge field backgrounds. The formalism can be used as a starting point for the construction of an interacting quantized two-time physics theory in a noncommutative soace-time.
Quantum Operation Time Reversal
Crooks, Gavin E.
2008-03-25T23:59:59.000Z
The dynamics of an open quantum system can be described by a quantum operation: A linear, complete positive map of operators. Here, I exhibit a compact expression for the time reversal of a quantum operation, which is closely analogous to the time reversal of a classical Markov transition matrix. Since open quantum dynamics are stochastic, and not, in general, deterministic, the time reversal is not, in general, an inversion of the dynamics. Rather, the system relaxes toward equilibrium in both the forward and reverse time directions. The probability of a quantum trajectory and the conjugate, time reversed trajectory are related by the heat exchanged with the environment.
'AdS_5' Geometry Beyond Space-time and 4D Noncommutative Space-time
Otto C. W. Kong
2009-06-19T23:59:59.000Z
We discuss a 4D noncommutative space-time as suggested by the version of quantum (deformed) relativity which provides a classical geometry picture as an `AdS_5'. The 4D noncommutative space-time is more like a part of a phase space description, in accordance with the quantum notion -- quantum mechanics talks about only states but not configurations. The `AdS_5' picture also illustrates the classical 4D space-time is to be described as part of a bigger geometry beyond space-time at the quantum level. The radically new picture of quantum 'space-time' is expected to provide the basis for a (still to be formulated) new approach to quantum gravity with fundamental constants (quantum) hbar and Newton's constant G put at a similar level as c, the speed of light.
Real estate investment in Cuba : is now the right time?
Chaviano, Damien Bronsdon
2008-01-01T23:59:59.000Z
On the eve of the fifty-year anniversary of the Cuban Revolution, change finally appears to be on the horizon for Cuba. In February 2008, Raul Castro succeeded his older brother Fidel as President of the Republic of Cuba. ...
Yousef Ghazi-Tabatabai
2012-11-19T23:59:59.000Z
While Quantum Gravity remains elusive and Quantum Field Theory retains the interpretational difficulties of Quantum Mechanics, we have introduced an alternate approach to the unification of particles, fields, space and time, suggesting that the concept of matter as space without time provides a framework which unifies matter with spacetime and in which we anticipate the development of complete theories (ideally a single unified theory) describing observed 'particles, charges, fields and forces' solely with the geometry of our matter-space-time universe.
White, Lynn
2000-06-27T23:59:59.000Z
, you expect unused time to come around again, so that when the same opportunities appear you will be wiser about how to use it. Consider how your cultural background af_fects the w ay you plan and manage time. W *Both cited in Bauer, J. It?s Time.... Effective time management means decid- ing which activity should be done from all the possibilities available, and then doing it. It is a matter of setting priorities. Deciding which jobs are most important and working on those may be better than doing less...
Intrinsic Time Quantum Geometrodynamics
Eyo Eyo Ita III; Chopin Soo; Hoi-Lai Yu
2015-02-06T23:59:59.000Z
Quantum Geometrodynamics with intrinsic time development and momentric variables is presented. An underlying SU(3) group structure at each spatial point regulates the theory. The intrinsic time behavior of the theory is analyzed, together with its ground state and primordial quantum fluctuations. Cotton-York potential dominates at early times when the universe was small; the ground state naturally resolves Penrose's Weyl Curvature Hypothesis, and thermodynamic and gravitational `arrows of time' point in the same direction. Ricci scalar potential corresponding to Einstein's General Relativity emerges as a zero-point energy contribution. A new set of fundamental commutation relations without Planck's constant emerges from the unification of Gravitation and Quantum Mechanics.
Intrinsic Time Quantum Geometrodynamics
Ita, Eyo Eyo; Yu, Hoi-Lai
2015-01-01T23:59:59.000Z
Quantum Geometrodynamics with intrinsic time development and momentric variables is presented. An underlying SU(3) group structure at each spatial point regulates the theory. The intrinsic time behavior of the theory is analyzed, together with its ground state and primordial quantum fluctuations. Cotton-York potential dominates at early times when the universe was small; the ground state naturally resolves Penrose's Weyl Curvature Hypothesis, and thermodynamic and gravitational `arrows of time' point in the same direction. Ricci scalar potential corresponding to Einstein's General Relativity emerges as a zero-point energy contribution. A new set of fundamental canonical commutation relations without Planck's constant emerges from the unification of Gravitation and Quantum Mechanics.
Technology on the Horizon & Over the Horizon
U.S. Energy Information Administration (EIA) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro IndustriesTownDells,1Stocks Nov-14Total DeliveredPrincipalNumber of Water8 WaterDonald
Developing Improved Travel Time Reliability Measures For Real-time
Bertini, Robert L.
reliability Use for prioritizing improvements Outline #12; 95th Percentile Travel Time Travel Time Index: mean travel time divided by free flow travel time Buffer Index: difference between 95th percentile travel time and mean travel time, divided by mean travel time Planning Time Index: 95th percentile
Zheng Bin; Lu, Amy; Hardesty, Lara A.; Sumkin, Jules H.; Hakim, Christiane M.; Ganott, Marie A.; Gur, David [Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213 (United States)
2006-01-15T23:59:59.000Z
The purpose of this study was to develop and test a method for selecting 'visually similar' regions of interest depicting breast masses from a reference library to be used in an interactive computer-aided diagnosis (CAD) environment. A reference library including 1000 malignant mass regions and 2000 benign and CAD-generated false-positive regions was established. When a suspicious mass region is identified, the scheme segments the region and searches for similar regions from the reference library using a multifeature based k-nearest neighbor (KNN) algorithm. To improve selection of reference images, we added an interactive step. All actual masses in the reference library were subjectively rated on a scale from 1 to 9 as to their 'visual margins speculations'. When an observer identifies a suspected mass region during a case interpretation he/she first rates the margins and the computerized search is then limited only to regions rated as having similar levels of spiculation (within {+-}1 scale difference). In an observer preference study including 85 test regions, two sets of the six 'similar' reference regions selected by the KNN with and without the interactive step were displayed side by side with each test region. Four radiologists and five nonclinician observers selected the more appropriate ('similar') reference set in a two alternative forced choice preference experiment. All four radiologists and five nonclinician observers preferred the sets of regions selected by the interactive method with an average frequency of 76.8% and 74.6%, respectively. The overall preference for the interactive method was highly significant (p<0.001). The study demonstrated that a simple interactive approach that includes subjectively perceived ratings of one feature alone namely, a rating of margin 'spiculation', could substantially improve the selection of 'visually similar' reference images.
Numerical analysis of similarity of barrier discharges in the 0.95 Ne/0.05 Xe mixture
Avtaeva, S. V.; Kulumbaev, E. B. [Kyrgyz-Russian Slavic University (Kyrgyzstan)
2009-04-15T23:59:59.000Z
Established dynamic regimes of similar (with a scale factor of 10) barrier discharges in the 0.95 Ne/0.05 Xe mixture are simulated in a one-dimensional drift-diffusion model. The similarity is examined of barrier discharges excited in gaps of lengths 0.4 and 4 mm at gas pressures of 350 and 35 Torr and dielectric layer thicknesses of 0.2 and 2 mm, the frequencies of the 400-V ac voltage applied to the discharge electrodes being 100 and 10 kHz, respectively.
Robert L. Oldershaw
2012-04-02T23:59:59.000Z
The incidence of planetary systems orbiting red dwarf stars with masses less than 0.4 solar masses provides a crucial observational test for the Self-Similar Cosmological paradigm. The discrete self-similarity of the paradigm mandates the prediction of anomalously few planetary systems associated with these lowest mass red dwarf stars, in contrast to conventional astrophysical assumptions. Ongoing observational programs are rapidly collecting the data necessary for testing this prediction and preliminary results are highly encouraging. A definitive verdict on the prediction should be available in the near future.
Roweis, Sam
SCIA 2003 Tutorial: Hidden Markov Models Sam Roweis, University of Toronto June 29, 2003 Probabilistic Generative Models for Time Series #15; Stochastic models for time-series: y 1 ; y 2 ; : : : ; y #15; Add noise to make the system stochastic: p(y t jy t 1 ;y t 2 ; : : : ;y t k ) #15; Markov models
S. Davood Sadatian
2014-05-08T23:59:59.000Z
In this article, we discuss probability of inhomogeneous time in high or low energy scale of physics. Consequently, the possibility was investigated of using theories such as varying speed of light (VSL) and fractal mathematics to build a framework within which answers can be found to some of standard cosmological problems and physics theories on the basis of time non-homogeneity.
A. Boyarsky; P Gora
2007-05-07T23:59:59.000Z
We present a definition of time measurement based on high energy photons and the fundamental length scale, and show that, for macroscopic time, it is in accord with the Lorentz transformation of special relativity. To do this we define observer in a different way than in special relativity.
M. Heller; W. Sasin
1997-11-17T23:59:59.000Z
In the groupoid approach to noncommutative quantization of gravity, gravitational field is quantized in terms of a C*-algebra A of complex valued funcions on a groupoid G (with convolution as multiplication). In the noncommutative quantum gravitational regime the concepts of space and time are meaningless. We study the "emergence of time" in the transition process from the noncommutative regime to the standard space-time geometry. Precise conditions are specified under which modular groups of the von Neumann algebra generated by A can be defined. These groups are interpreted as a state depending time flow. If the above conditions are further refined one obtains a state independent time flow. We show that quantum gravitational dynamics can be expressed in terms of modular groups.
Time Evolution of Temperature and Entropy of a Gravitationally Collapsing Cylinder
Evan Halstead; Peng Hao
2011-06-12T23:59:59.000Z
We investigate the time evolution of the temperature and entropy of a gravitationally collapsing cylinder, represented by an infinitely thin domain wall, as seen by an asymptotic observer. Previous work has shown that the entropy of a spherically symmetric collapsing domain approaches a constant, and we follow this procedure using a (3+1) BTZ metric to see if a different topology will yield different results. We do this by coupling a scalar field to the background of the domain wall and analyzing the spectrum of radiation as a function of time. We find that the spectrum is quasi-thermal, with the degree of thermality increasing as the domain wall approaches the horizon. The thermal distribution allows for the determination of the temperature as a function of time, and we find that the late time temperature is very close to the Hawking temperature and that it also exhibits the proper scaling with the mass. From the temperature we find the entropy. Since the collapsing domain wall is what forms a black hole, we can compare the results to those of the standard entropy-area relation. We find that the entropy does in fact approach a constant that is close to the Hawking entropy. However, the time dependence of the entropy shows that the entropy decreases with time, indicating that a (3+1) BTZ domain wall will not collapse spontaneously.
Research Infrastructures in Horizon 2020
Schettini, Raimondo
, sustainable agriculture, marine - maritime research, bio-economy Secure, clean and efficient energy Smart
None
2013-04-19T23:59:59.000Z
At the Office of Energy Efficiency and Renewable Energy's "Biomass 2011" conference, Argonne researcher Seth Snyder spoke with DOE Biomass Program head, Paul Bryan. In this conversation, Snyder explains the process of biochemical conversion, and talks about Argonne's patented resin wafer technology. The resin wafer electrodeionization technology may help significantly reduce the cost of producing clean energy and of the chemicals and water used in industry. The separations technology can also process biomass-based feedstocks into biofuels and chemicals.
Horizon thermodynamics and composite metrics
Lorenzo Sindoni
2012-11-12T23:59:59.000Z
We examine the conditions under which the thermodynamic behaviour of gravity can be explained within an emergent gravity scenario, where the metric is defined as a composite operator. We show that due to the availability of a boundary of a boundary principle for the quantum effective action, Clausius-like relations can always be constructed. Hence, any true explanation of the thermodynamic nature of the metric tensor has to be referred to an equilibration process, associated to the presence of an H-theorem, possibly driven by decoherence induced by the pregeometric degrees of freedom, and their entanglement with the geometric ones.
Archaeological Horizons in Central California
Heizer, Robert F.; Fenenga, Franklin
1939-01-01T23:59:59.000Z
1935 A Yokuts Cemetery at Elk Hills. Southwest Museum, The18, 1937. See also the Elk Hills site report (Walker, 1935)
Particle Physics at Discovery's Horizon
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)IntegratedSpeeding access toTestPhysicsParticipants Participants Largeuslhc.us
Your Horizons Conference April 6
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrincetonUsingWhatY-12 recognizedThesis Prize |gets young women
Sometimes hot water will have a "sour" smell, similar to that of an old damp rag. This smell often
. Odor-causing bacteria live and thrive in warm water and can infest the water heater. The problem (approximately 160 degrees F) for 8 hours. This will kill the bacteria. (Caution: Be sure the water heater has#12;Sometimes hot water will have a "sour" smell, similar to that of an old damp rag. This smell
Regulation of two highly similar genes, omcB and omcC, in a 10 kb chromosomal duplication in
Lovley, Derek
Regulation of two highly similar genes, omcB and omcC, in a 10 kb chromosomal duplication of Massachusetts at Amherst, Amherst, MA 01003, USA Received 5 January 2005 Revised 22 February 2005 Accepted 28 regulator, significantly lowered the omcB transcription when Fe(III) was the electron acceptor and partially
Modeling Information Scent: A Comparison of LSA, PMI and GLSA Similarity Measures on Common Tests, & Royer, 2005). We compare all these techniques on a unique corpus (TASA) and, for PMI and GLSA, we also that for large corpora PMI works best on word sim- ilarity tests, and GLSA on synonymy tests. For the smaller
Not Available
1993-01-01T23:59:59.000Z
This book contains the papers presented at the Third International Seminar on Double Layer Capacitors and Similar Energy Storage Devices in December, 1993. The topics of the papers include basic electrochemical principles, testing of ultracapacitors and systems for application in electric powered vehicles, performance of capacitors, materials used in supercapacitors, and reliability of supercapacitors.
Similarity Relationships in Creep Contacts and Applications in Nanoindentation Tests Y.F. Gao,1,2
Gao, Yanfei
Similarity Relationships in Creep Contacts and Applications in Nanoindentation Tests J.H. Lee,1 C-dependent (viscoplastic or creeping) solids has generally focused on the relationship between indentation hardness. Theoretical predictions agree well with real nanoindentation measurements on amorphous selenium when tested
Zhou, Yaoqi
Drug-drug similarity networks for anti-cancer drug discovery Case studies on Breast Cancer the decades, the medical industry has been challenged with the issue of producing drugs that would avoid sidetracking to other targets (off-targets) and keep away from harmful side effects (drug adverse reactions
Sapatinas, Theofanis
to electricity authorities worldwide to use as far as possible the low functionality cost machines for covering is performed by means of a weighted average of past daily load segments, the shape of which is similar is an integrable process in the design of power systems faced by electricity authorities world- wide. It involves
McInnis, Martha Jane
1982-01-01T23:59:59.000Z
Physical manifestations of time occur in natural forms of all sizes. Architectural form serves as shelter while providing a built envelope of human life, simultaneously influencing and influenced by energetic activities ...
Center for Human Reliability Studies
2007-05-01T23:59:59.000Z
The purpose of this monograph is to provide information on drug retention times in the human body. The information provided is based on plausible illegal drug use activities that might be engaged in by a recreational drug user
Center for Human Reliability Studies
2007-05-01T23:59:59.000Z
The purpose of this monograph is to provide information on drug retention times in the human body. The information provided is based on plausible illegal drug use activities that might be engaged in by a recreational drug user.
New Problems for an Old Design: Time-Series Analyses of Air Pollution and Health
Dominici, Francesca
New Problems for an Old Design: Time-Series Analyses of Air Pollution and Health Jonathan M. Samet1 of particulate air pollution on the same or recent days (1;2). Studies of similar time-series design of morbidity for adverse effects of particulate air pollution on the public's health. The daily time-series studies of air
TIME-VARYING CHANNEL MODEL EFFICIENCY Scott Rickard
Drakakis, Konstantinos
with constant radial velocity relative to one an- other. For ease of presentation, we consider in this work the derivation of the Doppler effect, although the resulting channel for elec- tromagnetic waves has a similar path Doppler effect non- relativistic channel. In Section 3 we derive the continuous time