Horizons versus singularities in spherically symmetric space-times
Bronnikov, K. A.; Elizalde, E.; Odintsov, S. D.; Zaslavskii, O. B.
2008-09-15
We discuss different kinds of Killing horizons possible in static, spherically symmetric configurations and recently classified as 'usual', 'naked', and 'truly naked' ones depending on the near-horizon behavior of transverse tidal forces acting on an extended body. We obtain the necessary conditions for the metric to be extensible beyond a horizon in terms of an arbitrary radial coordinate and show that all truly naked horizons, as well as many of those previously characterized as naked and even usual ones, do not admit an extension and therefore must be considered as singularities. Some examples are given, showing which kinds of matter are able to create specific space-times with different kinds of horizons, including truly naked ones. Among them are fluids with negative pressure and scalar fields with a particular behavior of the potential. We also discuss horizons and singularities in Kantowski-Sachs spherically symmetric cosmologies and present horizon regularity conditions in terms of an arbitrary time coordinate and proper (synchronous) time. It turns out that horizons of orders 2 and higher occur in infinite proper times in the past or future, but one-way communication with regions beyond such horizons is still possible.
Noise Kernel for Self-similar Tolman Bondi Metric: Fluctuations on Cauchy Horizon
Seema Satin; Kinjalk Lochan; Sukratu Barve
2013-04-12
We attempt to calculate the point separated Noise Kernel for self similar Tolman Bondi metric, using a method similar to that developed by Eftekharzadeh et. al for ultra-static spacetimes referring to the work by Page. In case of formation of a naked singularity, the Noise Kernel thus obtained is found to be regular except on the Cauchy horizon, where it diverges. The behavior of the noise in case of the formation of a covered singularity is found to be regular. This result seemingly renders back reaction non-negligible which questions the stability of the results obtained from the semiclassical treatment of the self similar Tolman Bondi metric.
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
Forecasting stock market returns over multiple time horizons
Kroujiline, Dimitri; Ushanov, Dmitry; Sharov, Sergey V; Govorkov, Boris
2015-01-01
In this paper we seek to demonstrate the predictability of stock market returns and explain the nature of this return predictability. To this end, we further develop the news-driven analytic model of the stock market derived in Gusev et al. (2015). This enables us to capture market dynamics at various timescales and shed light on mechanisms underlying certain market behaviors such as transitions between bull- and bear markets and the self-similar behavior of price changes. We investigate the model and show that the market is nearly efficient on timescales shorter than one day, adjusting quickly to incoming news, but is inefficient on longer timescales, where news may have a long-lasting nonlinear impact on dynamics attributable to a feedback mechanism acting over these horizons. Using the model, we design the prototypes of algorithmic strategies that utilize news flow, quantified and measured, as the only input to trade on market return forecasts over multiple horizons, from days to months. The backtested res...
Even perturbations of the self-similar Vaidya space-time
Nolan, Brien C.; Waters, Thomas J.
2005-05-15
We study even parity metric and matter perturbations of all angular modes in self-similar Vaidya space-time. We focus on the case where the background contains a naked singularity. Initial conditions are imposed, describing a finite perturbation emerging from the portion of flat space-time preceding the matter-filled region of space-time. The most general perturbation satisfying the initial conditions is allowed to impinge upon the Cauchy horizon (CH), where the perturbation remains finite: There is no 'blue-sheet' instability. However, when the perturbation evolves through the CH and onto the second future similarity horizon of the naked singularity, divergence necessarily occurs: This surface is found to be unstable. The analysis is based on the study of individual modes following a Mellin transform of the perturbation. We present an argument that the full perturbation remains finite after resummation of the (possibly infinite number of) modes.
Real-time Trajectory Design for Unmanned Aerial Vehicles using Receding Horizon Control
Real-time Trajectory Design for Unmanned Aerial Vehicles using Receding Horizon Control by Yoshiaki Students #12;2 #12;Real-time Trajectory Design for Unmanned Aerial Vehicles using Receding Horizon Control This thesis investigates the coordination and control of fleets of unmanned aerial vehicles (UAVs). Future
Park, Yeonjeong; Harmon, Thomas C
2009-01-01
optimization horizon. After the first optimal control is applied for the current management time step, the optimization process
The stability of Killing-Cauchy horizons in colliding plane wave space-times
J. B. Griffiths
2005-01-05
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.
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
Larry G. Stolarczyk
2003-03-18
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.
Cormac Breen; Adrian C. Ottewill
2012-01-11
We consider a quantum field which is in a Hartle-Hawking state propagating in a general spherically symmetric black hole space-time. We make use of uniform approximations to the radial equation to calculate the components of the stress tensor, renormalized using the Hadamard form of the Green's function, on the horizons of this space-time. We then specialize these results to the case of the `lukewarm' Reissner-Nordstrom-de Sitter black hole and derive some conditions on the stress tensor for the regularity of the Hartle-Hawking state.
Self-similar space-time evolution of an initial density discontinuity
Rekaa, V. L.; Pécseli, H. L.; Trulsen, J. K.
2013-07-15
The space-time evolution of an initial step-like plasma density variation is studied. We give particular attention to formulate the problem in a way that opens for the possibility of realizing the conditions experimentally. After a short transient time interval of the order of the electron plasma period, the solution is self-similar as illustrated by a video where the space-time evolution is reduced to be a function of the ratio x/t. Solutions of this form are usually found for problems without characteristic length and time scales, in our case the quasi-neutral limit. By introducing ion collisions with neutrals into the numerical analysis, we introduce a length scale, the collisional mean free path. We study the breakdown of the self-similarity of the solution as the mean free path is made shorter than the system length. Analytical results are presented for charge exchange collisions, demonstrating a short time collisionless evolution with an ensuing long time diffusive relaxation of the initial perturbation. For large times, we find a diffusion equation as the limiting analytical form for a charge-exchange collisional plasma, with a diffusion coefficient defined as the square of the ion sound speed divided by the (constant) ion collision frequency. The ion-neutral collision frequency acts as a parameter that allows a collisionless result to be obtained in one limit, while the solution of a diffusion equation is recovered in the opposite limit of large collision frequencies.
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
connected pv plant at Trieste, Italy. Solar Energy, 84(5):solar energy system (the UC Merced 1-MW photovoltaic plant).solar irradiance based on time series analysis: application to solar thermal power plants energy
A receding horizon control approach to sampled-data implementation of continuous-time controllers
Nesic, Dragan
(digital) controller. While tools for analysis and design of linear sampled-data systems are well developed] can be directly used for analysis of stability of our closed-loop system. Keywords: Controller design in implementing digitally continuous-time controllers that have been already designed. The cost function that we
Similarity dark energy models in Bianchi type -I space-time
Ali, Ahmad T; Alzahrani, Abdulah K
2015-01-01
We investigate some new similarity solutions of anisotropic dark energy and perfect fluid in Bianchi type-I space-time. Three different time dependent skewness parameters along the spatial directions are introduced to quantify the deviation of pressure from isotropy. We consider the case when the dark energy is minimally coupled to the perfect fluid as well as direct interaction with it. The Lie symmetry generators that leave the equation invariant are identified and we generate an optimal system of one-dimensional subalgebras. Each element of the optimal system is used to reduce the partial differential equation to an ordinary differential equation which is further analyzed. We solve the Einstein field equations, described by a system of non-linear partial differential equations (NLPDEs), by using the Lie point symmetry analysis method. The geometrical and kinematical features of the models and the behavior of the anisotropy of dark energy, are examined in detail.
A study of different horizons in inhomogeneous LTB cosmological model
Subenoy Chakraborty; Subhajit Saha
2015-03-04
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.
HORIZON SENSING (PROPOSAL No.51)
Larry G. Stolarczyk, Sc.D.
2001-10-01
Project objectives are to demonstrate the feasibility of real-time stress measurement, bit loading, and horizon sensing on a longwall shearer, boring machine, continuous miner, and loading bucket.
Physical observability of horizons
Matt Visser
2014-11-25
Event horizons are (generically) not physically observable. In contrast, apparent horizons (and the closely related trapping horizons) are generically physically observable --- in the sense that they can be detected by observers working in finite-size regions of spacetime. Consequently event horizons are inappropriate tools for defining astrophysical black holes, or indeed for defining any notion of evolving}black hole, (evolving either due to accretion or Hawking radiation). The only situation in which an event horizon becomes physically observable is for the very highly idealized stationary or static black holes, when the event horizon is a Killing horizon which is degenerate with the apparent and trapping horizons; and then it is the physical observability of the apparent/trapping horizons that is fundamental --- the event horizon merely comes along for the ride.
Physical observability of horizons
Visser, Matt
2014-01-01
Event horizons are (generically) not physically observable. In contrast, apparent horizons (and the closely related trapping horizons) are generically physically observable --- in the sense that they can be detected by observers working in finite-size regions of spacetime. Consequently event horizons are inappropriate tools for defining astrophysical black holes, or indeed for defining any notion of evolving}black hole, (evolving either due to accretion or Hawking radiation). The only situation in which an event horizon becomes physically observable is for the very highly idealized stationary or static black holes, when the event horizon is a Killing horizon which is degenerate with the apparent and trapping horizons; and then it is the physical observability of the apparent/trapping horizons that is fundamental --- the event horizon merely comes along for the ride.
Area products for black hole horizons
Visser, Matt
2013-01-01
Area products for multi-horizon black holes often have intriguing properties, and are often independent of the mass of the black hole (depending only on various charges, angular momenta, and moduli). Such products are often formulated in terms of the areas of inner (Cauchy) horizons and event horizons, and often include the effects of unphysical "virtual'" horizons. For the Schwarzschild-de Sitter [Kottler] black hole in (3+1) dimensions it is shown by explicit exact calculation that the product of event horizon area and cosmological horizon area is not mass independent. (Including the effect of the third "virtual" horizon does not improve the situation.) Similarly, in the Reissner-Nordstrom-anti-de Sitter black hole in (3+1) dimensions the product of inner (Cauchy) horizon area and event horizon area is calculated (perturbatively), and is shown to be not mass independent. That is, the mass-independence of the product of physical horizon areas is not generic. In the generic situation, whenever the quasi-local...
Deepwater Horizon Situation Report #5
2010-06-10
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/
Ghosh, Sayantan; Panigrahi, Prasanta K
2010-01-01
We make use of wavelet transform to study the multi-scale, self similar behavior and deviations thereof, in the stock prices of large companies, belonging to different economic sectors. The stock market returns exhibit multi-fractal characteristics, with some of the companies showing deviations at small and large scales. The fact that, the wavelets belonging to the Daubechies' (Db) basis enables one to isolate local polynomial trends of different degrees, plays the key role in isolating fluctuations at different scales. We make use of Db4 and Db6 basis sets to respectively isolate local linear and quadratic trends at different scales in order to study the statistical characteristics of these financial time series. The fluctuations reveal fat tail non-Gaussian behavior, unstable periodic modulations, at finer scales, from which the characteristic $k^{-3}$ power law behavior emerges at sufficiently large scales. We further identify stable periodic behavior through the continuous Morlet wavelet.
Banbara, Mutsunori
2020 Horizon 2020 FP7 "Critical Raw Materials Innovation Network" /Date: 2014 5 29 13301930 1300 and Nanotechnology Development Division, Research Promotion Bureau, MEXT 15:50 Horizon2020 Critical Raw Materials Innovation Network Lecture by Dr Catherine Joce, Project Manager of Critical Raw Materials Innovation
J. Gutowski; G. Papadopoulos
2011-07-11
We determine the geometry of all static black hole horizons of M-theory preserving at least one supersymmetry. We demonstrate that all such horizons are either warped products R^{1,1} *_w S or AdS_2 *_w S, where S admits an appropriate Spin(7) or SU(4) structure respectively; and we derive the conditions imposed by supersymmetry on these structures. We show that for electric static horizons with Spin(7) structure, the near horizon geometry is a product R^{1,1} * S, where S is a compact Spin(7) holonomy manifold. For electric static solutions with SU(4) structure, we show that the horizon section S is a circle fibration over an 8-dimensional Kahler manifold which satisfies an additional condition involving the Ricci scalar and the length of the Ricci tensor. Solutions include AdS_2 * S^3 * CY_6 as well as many others constructed from taking the 8-dimensional Kahler manifold to be a product of Kahler-Einstein and Calabi-Yau spaces.
Black Hole Initial Data with a Horizon of Prescribed Geometry
Brian Smith
2007-10-04
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.
The Wiener Disorder Problem with Finite Horizon
Peskir, Goran
of earthquakes or tsunamis; seismic signal processing; the appearance of a shock wave front; the studyThe Wiener Disorder Problem with Finite Horizon P. V. Gapeev and G. Peskir # Stochastic Process) time of 'disorder' when the drift of an observed Wiener process changes from one value to another
Can an evolving Universe host a static event horizon?
Aharon Davidson; Shimon Rubin; Yosef Verbin
2012-11-09
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.
Optical geometry across the horizon
Rickard Jonsson
2007-08-19
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
2010-12-02
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.
What happens to Petrov classification, on horizons of axisymmetric dirty black holes
Tanatarov, I. V.; Zaslavskii, O. B.
2014-02-15
We consider axisymmetric stationary dirty black holes with regular non-extremal or extremal horizons, and compute their on-horizon Petrov types. The Petrov type (PT) in the frame of the observer crossing the horizon can be different from that formally obtained in the usual (but singular in the horizon limit) frame of an observer on a circular orbit. We call this entity the boosted Petrov type (BPT), as the corresponding frame is obtained by a singular boost from the regular one. The PT off-horizon can be more general than PT on-horizon and that can be more general than the BPT on horizon. This is valid for all regular metrics, irrespective of the extremality of the horizon. We analyze and classify the possible relations between the three characteristics and discuss the nature and features of the underlying singular boost. The three Petrov types can be the same only for space-times of PT D and O off-horizon. The mutual alignment of principal null directions and the generator in the vicinity of the horizon is studied in detail. As an example, we also analyze a special class of metrics with utra-extremal horizons (for which the regularity conditions look different from the general case) and compare their off-horizon and on-horizon algebraic structure in both frames.
) ------- The Deepwater Horizon oil spill Natural Resource Damage Assessment Trustees (Trustees) today announced another Horizon oil spill Natural Resource Damage Assessment and restoration will continue until the publicDeepwater Horizon Natural Resource Damage Assessment Deepwater Horizon Trustees Announce Agreement
Electromagnetic radiation due to naked singularity formation in self-similar gravitational collapse
Mitsuda, Eiji; Yoshino, Hirotaka; Tomimatsu, Akira
2005-04-15
Dynamical evolution of test fields in background geometry with a naked singularity is an important problem relevant to the Cauchy horizon instability and the observational signatures different from black hole formation. In this paper we study electromagnetic perturbations generated by a given current distribution in collapsing matter under a spherically symmetric self-similar background. Using the Green's function method, we construct the formula to evaluate the outgoing energy flux observed at the future null infinity. The contributions from 'quasinormal' modes of the self-similar system as well as 'high-frequency' waves are clarified. We find a characteristic power-law time evolution of the outgoing energy flux which appears just before naked singularity formation and give the criteria as to whether or not the outgoing energy flux diverges at the future Cauchy horizon.
Electromagnetic radiation due to naked singularity formation in self-similar gravitational collapse
Eiji Mitsuda; Hirotaka Yoshino; Akira Tomimatsu
2005-05-10
Dynamical evolution of test fields in background geometry with a naked singularity is an important problem relevant to the Cauchy horizon instability and the observational signatures different from black hole formation. In this paper we study electromagnetic perturbations generated by a given current distribution in collapsing matter under a spherically symmetric self-similar background. Using the Green's function method, we construct the formula to evaluate the outgoing energy flux observed at the future null infinity. The contributions from "quasi-normal" modes of the self-similar system as well as "high-frequency" waves are clarified. We find a characteristic power-law time evolution of the outgoing energy flux which appears just before naked singularity formation, and give the criteria as to whether or not the outgoing energy flux diverges at the future Cauchy horizon.
Pedagogical notes on black holes, de Sitter space, and bifurcated horizons
Tom Banks
2010-07-22
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.
Fate and Speciation of Gasoline-Derived Lead in Organic Horizons of the Northeastern USA
Kaste,J.; Bostick, B.; Friedland, A.; Schroth, A.; Siccama, T.
2006-01-01
Although legislation in the late 1970s significantly reduced atmospheric lead (Pb) inputs to ecosystems in North America, organic (O) horizons in forests of the northeastern USA still contain up to 30 kg of gasoline-derived Pb ha{sup -1}. The residence time, geochemical behavior, and fate of this contaminant Pb in soils is poorly understood. Here we use forest floor time series data and synchrotron-based X-ray techniques to examine the mobility and speciation of Pb in O horizons collected from remote sites across the northeastern USA. At high elevation (>800 m) sites in Vermont and New York, samples collected from similar locations in 1980, 1990, and early 2000 had indistinguishable Pb contents, ranging ({+-}1{sigma}) from 11 to 29 kg Pb ha{sup -1}. However, at lower elevation and lower latitude sites with mixed vegetation, significant decreases in Pb amount were observed during the two-decade study period. Lower elevation sites ranged from 10 to 20 kg Pb ha{sup -1} in 1980, and from 2 to 10 kg Pb ha{sup -1} 20 yr later. Lead-enriched soil grains were determined to be amorphous with microfocused X-ray diffraction, and Pb concentrations correlated well with Fe on maps generated via microfocused X-ray fluorescence. Bulk Pb L{sub III}-edge X-ray absorption spectroscopy of coniferous O horizon samples indicate that Pb is binding to iron-rich soil particles by inner-sphere complexes, most likely to amorphous Fe oxides. Based on our paired regional and microscopic observations, we conclude that Pb is strongly retained in well-drained O horizons, and mobility is governed by decomposition and colloidal transport.
Surface gravities for non-Killing horizons
Cropp, Bethan; Visser, Matt
2013-01-01
There are many logically and computationally distinct characterizations of the surface gravity of a horizon, just as there are many logically rather distinct notions of horizon. Fortunately, in standard general relativity, for stationary horizons, most of these characterizations are degenerate. However, in modified gravity, or in analogue spacetimes, horizons may be non-Killing or even non-null, and hence these degeneracies can be lifted. We present a brief overview of the key issues, specifically focusing on horizons in analogue spacetimes and universal horizons in modified gravity.
Bordenave, Charles
Jean Paul Bonnet PCN CNRS HORIZON 2020 Secure, Clean and Efficient Energy THE EU FRAMEWORK,6 billion #12;Secure, Clean and efficient Energy Work Programme 2014-2015 Energy Challenge - main challenges efficiency in industry, decrease energy costs Building a European Research Area in the field of energy
Brian Cox
2010-01-12
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.
Brian Cox
2010-09-01
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.
The Path to Disaster The Deepwater Horizon
Pym, David J.
was not disconnected · The escaping gas ignited · 11 dead · The drilling rig Deepwater Horizon sank after 2 days #1221/08/2013 1 The Path to Disaster The Deepwater Horizon BP's disaster in the Gulf of Mexico Industrial Psychology Research Centre 14th August, 2013 Transocean Deepwater Horizon #12;21/08/2013 2
Emergent Horizons in the Laboratory
Ralf Schützhold
2010-04-15
The concept of a horizon known from general relativity describes the loss of causal connection and can be applied to non-gravitational scenarios such as out-of-equilibrium condensed-matter systems in the laboratory. This analogy facilitates the identification and theoretical study (e.g., regarding the trans-Planckian problem) and possibly the experimental verification of "exotic" effects known from gravity and cosmology, such as Hawking radiation. Furthermore, it yields a unified description and better understanding of non-equilibrium phenomena in condensed matter systems and their universal features. By means of several examples including general fluid flows, expanding Bose-Einstein condensates, and dynamical quantum phase transitions, the concepts of event, particle, and apparent horizons will be discussed together with the resulting quantum effects.
Regularity of Horizons and The Area Theorem Piotr T. Chru sciel Erwann Delay y
ChruÂ?ciel, Piotr T.
Conclusions 51 A The Geometry of C 2 Null Hypersurfaces 52 B Some comments on the area theorem of HawkingRegularity of Horizons and The Area Theorem Piotr T. Chru#19;sciel #3; Erwann Delay y D#19 12, 2000 Abstract We prove that the area of sections of future event horizons in space{ times
Horizons cannot save the Landscape
Iosif Bena; Alex Buchel; Oscar J. C. Dias
2012-12-20
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.
Horizon of quantum black holes in various dimensions
Casadio, Roberto; Giugno, Andrea; Mureika, Jonas
2015-01-01
We adapt the horizon wave-function formalism to describe massive static spherically symmetric sources in a general $(1+D)$-dimensional space-time, for $D>3$ and including the $D=1$ case. We find that the probability $P_{\\rm BH} $ that such objects are (quantum) black holes behaves similarly to the probability in the $(3+1)$ framework for $D> 3$. In fact, for $D\\ge 3$, the probability increases towards unity as the mass grows above the relevant $D$-dimensional Planck scale $m_D$, the faster the larger $D$. In contrast, for $D=1$, we find the probability is comparably larger for smaller masses, but $P_{\\rm BH} < 0.5$, suggesting that such lower dimensional black holes are purely quantum and not classical objects. This result is consistent with recent observations that sub-Planckian black holes are governed by an effective two-dimensional gravitation theory. Lastly, we derive Generalised Uncertainty Principle relations for the black holes under consideration, and for all cases find a minimum length scale $L_D...
Two physical characteristics of numerical apparent horizons
Ivan Booth
2007-12-20
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.
An oblique membrane paradigm for cosmological horizon
Tower Wang
2014-11-24
The membrane paradigm is a formalism for studying the event horizon of black holes. After analyzing it with some technical details and realizing it in the Reissner-Nordstrom black hole, we extend the paradigm to cosmological horizons. A standard membrane paradigm is established for the pure de Sitter horizon, and an oblique membrane paradigm is proposed for the trapping horizon of the Friedmann-Lemaitre-Robertson-Walker universe. In the latter case, the cosmological stretched horizon is oblique, thus the running of renormalization parameter is nonzero in the timelike direction and gives a correction to the membrane pressure. In this paradigm, the cosmological equations come from continuity equations of the membrane fluid and the bulk fluid respectively.
ORISE: White paper analyzes Deepwater Horizon event for improving...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Horizon response, identifies approaches for radiological or nuclear emergency planning The 2010 Deepwater Horizon oil spill shares many of the same challenges associated...
Horizon effects with surface waves on moving water
Germain Rousseaux; Philippe Maissa; Christian Mathis; Pierre Coullet; Thomas G. Philbin; Ulf Leonhardt
2010-10-01
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.
Zager, Laura (Laura A.)
2005-01-01
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. ...
Crawford, T. Daniel
. Foster is a new Associate ProfessorinVirginiaTechwww.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Smart Materials Based on Cellulose Nanocrystals microelectrodes. Herein, the fabrication of a new generation of stimuli-responsive, mechanically adaptive
Broderick, Avery E.
The 6 × 10[superscript 9] M[subscript ?] 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 ...
On Thermodynamics and Phase Space of Near Horizon Extremal Geometries
Hajian, Kamal
2015-01-01
Near Horizon Extremal Geometries (NHEG), are geometries which may appear in the near horizon region of the extremal black holes. These geometries have $SL(2,\\mathbb{R})\\!\\times\\!U(1)^n$ isometry, and constitute a family of solutions to the theory under consideration. In the first part of this report, their thermodynamic properties are reviewed, and their three universal laws are derived. In addition, at the end of the first part, the role of these laws in black hole thermodynamics is presented. In the second part of this thesis, we review building their classical phase space in the Einstein-Hilbert theory. The elements in the NHEG phase space manifold are built by appropriately chosen coordinate transformations of the original metric. These coordinate transformations are generated by some vector fields, dubbed "symplectic symmetry generators." To fully specify the phase space, we also need to identify the symplectic structure. In order to fix the symplectic structure, we use the formulation of Covariant Phase...
A PLAN FOR A NEW HORIZON ENVISIONING VIRGINIA TECH 2012-2018 STRATEGIC PLAN #12;Envisioning VirginiaTech 2012-2018 II Contents A PLAN FOR A NEW HORIZON E n v i s i o n i n g V i r g i n i a T e c h 2 Inspiring creativity, curiosity, and critical thinking 12 A new vision for undergraduate general education
Phantom Energy and the Cosmic Horizon: Rh is still not a horizon!
Geraint F. Lewis
2013-01-02
There has been a recent spate of papers on the Cosmic Horizon, an apparently fundamental, although unrecognised, property of the universe. The misunderstanding of this horizon, it is claimed, demonstrates that our determination of the cosmological makeup of the universe is incorrect, although several papers have pointed out key flaws in these arguments. Here, we identify additional flaws in the most recent claims of the properties of the Cosmic Horizon in the presence of phantom energy, simply demonstrating that it does not act as a horizon, and that its limiting of our view of the universe is a trivial statement.
Fusion of Edge-less and Edge-based Approaches for Horizon Line Detection
Bebis, George
the horizon line. In the edge-less approach, classification is used to obtain a confidence of horizon-ness. Moreover, we propose fusing the information about the horizon-ness and edge-ness of each pixel. Our
Vacuum non-expanding horizons and shear-free null geodesic congruences
T. M. Adamo; E. T. Newman
2009-08-05
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.
Evidence for the Black Hole Event Horizon
Ramesh Narayan; Jeremy S. Heyl
2002-04-26
Roughly a dozen X-ray binaries are presently known in which the compact accreting primary stars are too massive to be neutron stars. These primaries are identified as black holes, though there is as yet no definite proof that any of the candidate black holes actually possesses an event horizon. We discuss how Type I X-ray bursts may be used to verify the presence of the event horizon in these objects. Type I bursts are caused by thermonuclear explosions when gas accretes onto a compact star. The bursts are commonly seen in many neutron star X-ray binaries, but they have never been seen in any black hole X-ray binary. Our model calculations indicate that black hole candidates ought to burst frequently if they have surfaces. Based on this, we argue that the lack of bursts constitutes strong evidence for the presence of event horizons in these objects.
Crawford, T. Daniel
, it is clear that scales of the order of the total wind farm size are those, which are critical in determiningwww.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Wind Plant Aerodynamics- A Spectral Analysis are constructed. Thus, from these modal expansions it is established that low order modes have large contributions
Crawford, T. Daniel
www.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Towards Ubiquitous Cost- competitive Solar Power of energy in one year. Tapping into this enormous potential requires reducing the cost of solar collection% to make solar energy cost competitive with other forms of energy, without subsidies, by the end
NASA's New Horizons Mission Dr. Henry Throop
Throop, Henry
Battery Camera #12;LORRI (Visible Imager) PEPSSI SWAP (Solar Wind) RALPH (Visible/IR Imager/ Spectrometer't land, and it never comes back to Earth. New Horizons Spacecraft #12;Radio Battery Camera #12;Radio images. Refine radii and orbits. Search for rings and satellites. Search for clouds and hazes. !Ralph
Crawford, T. Daniel
www.ictas.vt.edu NEW HORIZONS ICTAS SEMINAR SERIES Ion Mediated "Polymerization" of Nanoparticles at the University of Nebraska-Lincoln. Prior to moving to the Midwest, he spent four years at Virginia Tech the University of Massachusetts, Amherst and a B. Tech in Chemical Engineering from the Indian Institute
New Horizons for Deep Subsurface Microbiology
Onstott, Tullis
life cannot exist. · Experiments being designed for the Deep Un- derground Science and EngineeringNew Horizons for Deep Subsurface Microbiology Subsurface microorganisms may grow slowly 200-m-deep wells along with procedures to monitor for drilling-related contaminants, uncovered
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
Fiber-optical analogue of the event horizon: Appendices
Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt
2007-12-13
We explain the theory behind our fiber-optical analogue of the event horizon and present the experiment in detail.
Deepwater Horizon Study Group 3 Environmental Report January 2011
Silver, Whendee
assessment of the Deepwater Horizon oil spill, as well as summarize the lessons learned from the spillDeepwater Horizon Study Group 3 Environmental Report January 2011 1 The Macondo Blowout. #12;Deepwater Horizon Study Group The Macondo Blowout Environmental Report 2 1 Looking Back
Bounds for scalar waves on self-similar naked-singularity backgrounds
Brien C. Nolan
2006-06-19
The stability of naked singularities in self-similar collapse is probed using scalar waves. It is shown that the multipoles of a minimally coupled massless scalar field propagating on a spherically symmetric self-similar background spacetime admitting a naked singularity maintain finite $L^2$ norm as they impinge on the Cauchy horizon. It is also shown that each multipole obeys a pointwise bound at the horizon, as does its locally observed energy density. $L^2$ and pointwise bounds are also obtained for the multipoles of a minimally coupled massive scalar wave packet.
Evidence for the Black Hole Event Horizon
Ramesh Narayan
2003-10-23
Astronomers have discovered many candidate black holes in X-ray binaries and in the nuclei of galaxies. The candidate objects are too massive to be neutron stars, and for this reason they are considered to be black holes. While the evidence based on mass is certainly strong, there is no proof yet that any of the objects possesses the defining characteristic of a black hole, namely an event horizon. Type I X-ray bursts, which are the result of thermonuclear explosions when gas accretes onto the surface of a compact star, may provide important evidence in this regard. Type I bursts are commonly observed in accreting neutron stars, which have surfaces, but have never been seen in accreting black hole candidates. It is argued that the lack of bursts in black hole candidates is compelling evidence that these objects do not have surfaces. The objects must therefore possess event horizons.
Near-horizon Extreme Kerr Magnetospheres
Compère, G
2015-01-01
Analytical solutions to force-free electrodynamics around black holes are fundamental to build simple models of accretion disk and jet dynamics. We present a (non-exhaustive) classification of complex highest weight solutions to the force-free equations in the near-horizon region of the extremal Kerr black hole. Bounds on the weights of solutions are derived from the finiteness of energy and the existence of a variational principle. Two classes of real magnetically dominated solutions, respectively axisymmetric and non-axisymmetric, are described which admit finite energy with respect to the asymptotically flat observer. Subtleties related to the velocity of light surface in the near-horizon region are discussed.
Fiber-optical analogue of the event horizon
Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt
2008-02-13
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.
Stewart, James
, \\Shadows for bump-mapped surfaces", in Advanced Computer Graphics (Proceedings of Computer Graphics Tokyo. Hershberger, \\Finding the upper envelope of n line segments in O(nlogn) time", Inform. Process. Lett., vol. 33. The horizon computation can also be used to build horizon maps that are used in conjunction with bump maps
Stewart, James
. Max, ``Shadows for bumpmapped surfaces'', in Advanced Computer Graphics (Proceedings of Computer, pp. 92--99. [10] J. Hershberger, ``Finding the upper envelope of n line segments in O(n log n) time input to a progressive radiosity algorithm. The horizon computation can also be used to build horizon
Avery E. Broderick; Ramesh Narayan; John Kormendy; Eric S. Perlman; Marcia J. Rieke; Sheperd S. Doeleman
2015-04-05
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.
Deepwater Horizon Study Finds Crude Oil Harmful to Bluefin, Yellowfin Tuna
Grosell, Martin
Deepwater Horizon Study Finds Crude Oil Harmful to Bluefin, Yellowfin Tuna This photo from April 24 sponsored by the National Oceanic and Atmospheric Administration, found that crude oil from the 2010 for 87 days, during which time it discharged nearly 5 million barrels of crude oil. Since the spill
One-Dimensional Infinite Horizon Nonconcave Optimal Control Problems Arising in Economic Dynamics
Zaslavski, Alexander J., E-mail: ajzasl@tx.technion.ac.il [Technion-Israel Institute of Technology, Department of Mathematics (Israel)
2011-12-15
We study the existence of optimal solutions for a class of infinite horizon nonconvex autonomous discrete-time optimal control problems. This class contains optimal control problems without discounting arising in economic dynamics which describe a model with a nonconcave utility function.
Navier-Stokes on Black Hole Horizons and DC Thermoelectric Conductivity
Aristomenis Donos; Jerome P. Gauntlett
2015-11-12
Within the context of the AdS/CFT correspondence we show that the DC thermoelectric conductivity can be obtained by solving the linearised, time-independent and forced 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
2015-01-01
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.
Learning task-specific similarity
Shakhnarovich, Gregory
2006-01-01
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 ...
Dan Nelson; Joseph Hardin; Iosif Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
1990-01-01
W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)
Dan Nelson; Joseph Hardin; Iosif Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
2011-09-14
X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)
Dan Nelson; Joseph Hardin; Iosif Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
2011-05-24
Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Dan Nelson; Joseph Hardin; Iosif (Andrei) Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
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)]
Dan Nelson; Joseph Hardin; Iosif (Andrei) Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
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)]
Dan Nelson; Joseph Hardin; Iosif (Andrei) Lindenmaier; Bradley Isom; Karen Johnson; Nitin Bharadwaj
Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)
Review of “Deepwater Horizon Release Estimate of Rate by PIV”
Onishi, Yasuo
2010-06-01
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.
Dynamical Horizons: Energy, Angular Momentum, Fluxes and Balance Laws
Abhay Ashtekar; Badri Krishnan
2002-11-03
Dynamical horizons are considered in full, non-linear general relativity. Expressions of fluxes of energy and angular momentum carried by gravitational waves across these horizons are obtained. Fluxes are local, the energy flux is positive and change in the horizon area is related to these fluxes. The flux formulae also give rise to balance laws analogous to the ones obtained by Bondi and Sachs at null infinity and provide generalizations of the first and second laws of black hole mechanics.
Air-Shower Spectroscopy at horizons
D. Fargion
2005-11-20
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.
Narayan, Ramesh; Perlman, Eric S; Rieke, Marcia J; Doeleman, Sheperd S
2015-01-01
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...
Cosmic Censorship: Formation of a Shielding Horizon Around a Fragile Horizon
Shahar Hod
2013-02-27
The weak cosmic censorship conjecture asserts that spacetime singularities that arise in gravitational collapse are always hidden inside of black holes, invisible to distant observers. This conjecture, put forward by Penrose more than four decades ago, is widely believed to be one of the basic principles of nature. However, a complete proof of this hypothesis is still lacking and the validity of the conjecture has therefore remained one of the most important open questions in general relativity. In this study we analyze a gedanken experiment which is designed to challenge cosmic censorship by trying to overcharge a Reissner-Nordstr\\"om black hole: a charged shell is lowered {\\it adiabatically} into the charged black hole. The mass-energy delivered to the black hole can be red-shifted by letting the dropping point of the shell approach the black-hole horizon. On the other hand, the electric charge of the shell is not red-shifted by the gravitational field of the black hole. It therefore seems, at first sight, that the charged shell is not hindered from entering the black hole, overcharging it and removing its horizon. However, in the present study we prove that the exposure of a naked singularity to distant observers is actually excluded due to the formation of a new (and {\\it larger}) horizon around the original black hole. Moreover, we shall prove that this new horizon is already formed {\\it before} the charged shell crosses the original black-hole horizon. This result, which seems to have been previously overlooked, guarantees the validity of the weak cosmic censorship conjecture in this type of gedanken experiments.
Pluto's Seasons: New Predictions for New Horizons L. A. Young
Young, Leslie A.
(2012) and Young (in prep). Energy balance for the world that New Horizons will encounter in 2015, and our ability to relate this snapshot to preceding
Green Investment Horizons: Effects of Policy on the Market for...
Green Investment Horizons: Effects of Policy on the Market for Building Energy Efficiency Technologies Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Green Investment...
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
2014-01-01
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 complementarity in elliptic de Sitter space
Lucas Hackl; Yasha Neiman
2015-02-03
We study a quantum field in elliptic de Sitter space dS_4/Z_2 - the spacetime obtained from identifying antipodal points in dS_4. We find that the operator algebra and Hilbert space cannot be defined for the entire space, but only for observable causal patches. This makes the system into an explicit realization of the horizon complementarity principle. In the absence of a global quantum theory, we propose a recipe for translating operators and states between observers. This translation involves information loss, in accordance with the fact that two observers see different patches of the spacetime. As a check, we recover the thermal state at the de Sitter temperature as a state that appears the same to all observers. This thermal state arises from the same functional that, in ordinary dS_4, describes the Bunch-Davies vacuum.
Thermodynamics of Apparent Horizon and Friedmann Equations in Big Bounce Universe
Molin Liu; Yuling Yang; Jianbo Lv; Lixin Xu
2014-12-08
In this paper, the thermodynamics of apparent horizon and Friedmann equations are studied in a big bounce universe typified by a non-singular big bounce, as opposed to a singular big bang. This cosmological model can describe radiation dominated early universe and matter dominated late universe in FRW model. Our calculational results show that Einstein gravitational field equations could be derived by the first law of thermodynamics and the fluid's continuity equation. The connections between thermodynamics and gravity are observed in big bounce universe. In the late stages of cold and hot universes, the apparent horizons are convergent and the time when apparent horizons begin to bounce essentially in agreement with that of universe's scalar factor. In the early stage of both cold and hot universes, we find there is only one geometry containing a 4D de Sitter universe with general state parameter. Furthermore, we also find the form of apparent horizon in early universe is strongly dependent on the extra dimension which suggests that the effect of extra dimension could be found in early universe.
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
On a resource allocation model with infinite horizon
Wagner, Marcus
into the model which contains a weight function. The new problem, called now the adapted resource allocationOn a resource allocation model with infinite horizon Valeriya Lykina, Sabine Pickenhain and Marcus 13 44, D-03013 Cottbus, Germany #12;On a Resource Allocation Model with Infinite Horizon Valeriya
Aligning Technology Solutions to Address Over-the-Horizon Threats
Aligning Technology Solutions to Address Over-the-Horizon Threats As the world's geopolitical for the U.S. Government bridging the gap between policy development and technology implementation WHAT WE-the-horizon security threats and issues Analysis results to support U.S. policymakers and the science and technology
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
DOI Strategic Sciences Working Group Mississippi Canyon 252/Deepwater Horizon Oil Spill
DOI Strategic Sciences Working Group Mississippi Canyon 252/Deepwater Horizon Oil Spill Strategic Sciences Working Group Mississippi Canyon 252/Deepwater Horizon Oil Spill Progress Report Executive Summary Introduction and Objectives The Mississippi Canyon 252/Deepwater Horizon (MS252) oil spill
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...
Clement, Prabhakar
Chemical fingerprinting of petroleum biomarkers in Deepwater Horizon oil spill samples collected the chromatographic signatures of petroleum biomarkers in Deepwater Horizon (DH) source oil, three other reference
RNA-Seq reveals complex genetic response to deepwater horizon oil release in Fundulus grandis
Garcia, Tzintzuni I; Shen, Yingjia; Crawford, Douglas; Oleksiak, Marjorie F; Whitehead, Andrew; Walter, Ronald B
2012-01-01
Abbreviations DH: Deepwater Horizon drilling platform; AHR:blowout of the Deepwater Horizon (DH) drilling platform wasexplosion of the Deepwater Hori- zon oil drilling platform
Perturbative String Thermodynamics near Black Hole Horizons
Thomas G. Mertens; Henri Verschelde; Valentin I. Zakharov
2015-07-01
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.
Bachelor Thesis in Textual Similarity
dybden med emner som lighed og dennes definition, sprog og ord,sÃ¥ algoritmer og andre vÃ¦rktÃ¸jer for at finde tekstsammenligning. To algoritmer, Optimal String Alignment Distance og Cosine Similarity, er sÃ¥ blevet implementeret med og uden Stemmer og Stop Word removal algoritmer. Der er lavet mange test hvor
Entropy of isolated horizons from quantum gravity condensates
Oriti, Daniele; Sindoni, Lorenzo
2015-01-01
We construct condensate states encoding the continuum spherically symmetric quantum geometry of an isolated horizon in full quantum gravity, i.e. without any classical symmetry reduction, in the group field theory formalism. Tracing over the bulk degrees of freedom, we show how the resulting reduced density matrix manifestly exhibits an holographic behavior. We derive a complete orthonormal basis of eigenstates for the reduced density matrix of the horizon and use it to compute the horizon entanglement entropy. By imposing consistency with the isolated horizon boundary conditions and semi-classical thermodynamical properties, we recover the Bekenstein--Hawking entropy formula for any value of the Immirzi parameter. Our analysis supports the equivalence between the von Neumann (entanglement) entropy interpretation and the Boltzmann (statistical) one.
A Fast Moving Horizon Estimation Algorithm Based on Nonlinear ...
2008-02-19
Department of Chemical Engineering, Carnegie Mellon University, 5000 ... Moving Horizon Estimation (MHE) is an efficient optimization-based strategy ...... concentrations of ethylene, butane, methane and impurities throughout the plant units.
A note on electrical and thermodynamic properties of Isolated Horizon
Gerui Chen; Xiaoning Wu; Sijie Gao
2014-10-29
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.
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 ...
String-theoretic breakdown of effective field theory near black hole horizons
Dodelson, Matthew
2015-01-01
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...
Quantum mechanics emerges from information theory applied to causal horizons
Jae-Weon Lee
2011-02-28
It is suggested that quantum mechanics is not fundamental but emerges from classical information theory applied to causal horizons. The path integral quantization and quantum randomness can be derived by considering information loss of fields or particles crossing Rindler horizons for accelerating observers. This implies that information is one of the fundamental roots of all physical phenomena. The connection between this theory and Verlinde's entropic gravity theory is also investigated.
Quantum mechanics emerges from information theory applied to causal horizons
Lee, Jae-Weon
2010-01-01
It is suggested that quantum mechanics is not fundamental but emerges from information theory applied to a causal horizon. The path integral quantization and quantum randomness can be derived by considering information loss of fields or particles crossing Rindler horizons for accelerating observers. This implies that information is one of the fundamental root of all physical phenomena. The connection between this theory and Verlinde's entropic gravity theory is also investigated.
Distributional Schwarzschild Geometry from nonsmooth regularization via Horizon
Jaykov Foukzon
2015-06-24
In this paper we leave the neighborhood of the singularity at the origin and turn to the singularity at the horizon. Using nonlinear superdistributional geometry and supergeneralized functions it seems possible to show that the horizon singularity is not only a coordinate singularity without leaving Schwarzschild coordinates. However the Tolman formula for the total energy $E$ of a static and asymptotically flat spacetime, gives $E=m$, as it should be. New class Colombeau solutions to Einstein field equations is obtained.
Roget's Thesaurus and Semantic Similarity
Jarmasz, Mario
2012-01-01
We have implemented a system that measures semantic similarity using a computerized 1987 Roget's Thesaurus, and evaluated it by performing a few typical tests. We compare the results of these tests with those produced by WordNet-based similarity measures. One of the benchmarks is Miller and Charles' list of 30 noun pairs to which human judges had assigned similarity measures. We correlate these measures with those computed by several NLP systems. The 30 pairs can be traced back to Rubenstein and Goodenough's 65 pairs, which we have also studied. Our Roget's-based system gets correlations of .878 for the smaller and .818 for the larger list of noun pairs; this is quite close to the .885 that Resnik obtained when he employed humans to replicate the Miller and Charles experiment. We further evaluate our measure by using Roget's and WordNet to answer 80 TOEFL, 50 ESL and 300 Reader's Digest questions: the correct synonym must be selected amongst a group of four words. Our system gets 78.75%, 82.00% and 74.33% of ...
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
2006-02-10
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.
Ferrari-Trecate, Giancarlo
. Keywords: Large scale systems, moving horizon estimator, system partitioning, hydro power valley. 1
Universal thermodynamics in different gravity theories: Modified entropy on the horizons
Saugata Mitra; Subhajit Saha; Subenoy Chakraborty
2015-03-10
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.
Crawford, T. Daniel
-inspireddesignandinformalscienceeducation using bio-inspired design. Janine Benyus, President and Founder of Biomimicry 3.8, Time Magazine Hero
Uncertain Time-Series Similarity: Return to the Basics
Palpanas, Themis
efficiency, prod- uct quality and safety, hydrologic and geologic observing systems, pollution management- sor networks are used in hydrologic and geologic ob- serving systems, pollution management in urban of ap- plication domains, including traffic flow management, me- teorology, astronomy, remote sensing
Thermodynamics of Black Hole Horizons and Kerr/CFT Correspondence
Bin Chen; Shen-xiu Liu; Jia-ju Zhang
2012-11-02
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.
Horizons and Tunneling in the Euclidean False Vacuum
Kate Marvel; Neil Turok
2007-12-17
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.
Thermodynamics on the apparent horizon in generalized gravity theories
Shao-Feng Wu; Bin Wang; Guo-Hong Yang
2008-01-17
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.
Similarity and singularity in adhesive elastohydrodynamic touchdown
Carlson, Andreas
2015-01-01
We consider the touchdown of an elastic sheet as it adheres to a wall, which has a dynamics that is limited by the viscous resistance provided by the squeeze flow of the intervening liquid trapped between the two solid surfaces. The dynamics of the sheet is described mathematically by elastohydrodynamic lubrication theory, coupling the elastic deformation of the sheet, the microscopic van der Waals adhesion and the viscous thin film flow. We use a combination of numerical simulations of the governing partial differential equation and a scaling analysis to describe the self-similar solution of the touchdown of the sheet as it approaches the wall. An analysis of the equation satisfied by the similarity variables in the vicinity of the touchdown event shows that an entire sequence of solutions are allowed. However, a comparison of these shows that only the fundamental similarity solution is observed in the time-dependent numerical simulations, consistent with the fact that it alone is stable. Our analysis genera...
Formation of naked singularities in five-dimensional space-time
Yamada, Yuta; Shinkai, Hisa-aki
2011-03-15
We numerically investigate the gravitational collapse of collisionless particles in spheroidal configurations both in four- and five-dimensional (5D) space-time. We repeat the simulation performed by Shapiro and Teukolsky (1991) that announced an appearance of a naked singularity, and also find similar results in the 5D version. That is, in a collapse of a highly prolate spindle, the Kretschmann invariant blows up outside the matter and no apparent horizon forms. We also find that the collapses in 5D proceed more rapidly than in 4D, and the critical prolateness for the appearance of an apparent horizon in 5D is loosened, compared to 4D cases. We also show how collapses differ with spatial symmetries comparing 5D evolutions in single-axisymmetry, SO(3), and those in double-axisymmetry, U(1)xU(1).
Abreu, Gabriel
2010-01-01
In a general time-dependent (3+1)-dimensional spherically symmetric spacetime, the so-called Kodama vector is a naturally defined geometric quantity that is timelike outside the evolving horizon and so defines a preferred class of fiducial observers. However the Kodama vector does not by itself define any preferred notion of time. We demonstrate that a preferred time coordinate - which we shall call Kodama time - can be introduced by taking the additional step of applying the Clebsch decomposition theorem to the Kodama vector. We thus construct a geometrically preferred coordinate system for any time-dependent spherically symmetric spacetime, and explore its properties. In particular we use this formalism to construct a general class of conservation laws, generalizing Kodama's energy flux. We study the geometrically preferred fiducial observers, and demonstrate that it is possible to define and calculate a generalized notion of surface gravity that is valid throughout the entire evolving spacetime. Furthermor...
Horiuchi, Timothy K.
in the construction of micro aerial vehicles ( 15 cm) have highlighted the lack of real-time sensors for flight environments and cannot give estimates of altitude. For these reasons, real-time detection of the visual horizon may be desir- able for the stabilization of pitch and roll of micro aerial vehi- cles at medium
Crawford, T. Daniel
Charter (WWFC). This unique document was issued for the first time in 1998 by four global automotive orga- nizations from USA, Europe and Japan, plus 15 other national automotive organizations. The Charter aims. Rodica A. Baranescu is a professor at University of Illinois at Chicago, Department of Mechanical
Transsaccadic identification of highly similar artificial shapes
Crawford, Doug
., & Verfaillie, K. (2009). Transsaccadic identification of highly similar artificial shapes. Journal of Vision, 9Transsaccadic identification of highly similar artificial shapes Laboratory of Experimental on postsaccadic perception do indeed occur. We presented subjects with highly similar artificial shapes, preceded
Evolution of the horizons for dark energy universe
Ritabrata Biswas; Nairwita Mazumder; Subenoy Chakraborty
2011-06-12
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.
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
Soil Horizons Some Noteworthy Soil Science in Wisconsin
Meyers, Stephen R.
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
Adaptive Receding Horizon Control of a Distributed Collector Solar Field
Sontag, Eduardo
Adaptive Receding Horizon Control of a Distributed Collector Solar Field J.M. Igreja, J. M. Lemos for a distributed collector solar field which ex- plicitly explores its distributed parameter character. The plant considered is a distributed collector solar field, being described by a nonlinear hyperbolic partial
A moving horizon solution to the gas pipeline optimization problem
Grossmann, Ignacio E.
discharge pressures and supplier flow rates for Parameters Forecast of future demand loads for i i i ti describing flow of gas through a pipe. Optimization scope Compression energy for the supplier to be minimized, while satisfying gas demands, contract pressures and physical constraints. Moving Horizon
Liouville theory beyond the cosmological horizon
Geoffrey Compère; Laura Donnay; Pierre-Henry Lambert; Waldemar Schulgin
2015-04-29
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.
Chen, Yiling
and research libraries across the globe. #12;iii Introduction 1 Trends Accelerating Technology Adoption in Academic and Research Libraries 4 Fast Trends: Driving technology adoption in academic and research of education around the globe. This volume, the NMC Horizon Report: 2014 Library Edition, examines key trends
Horizon Extender: Long-term Preservation of Data Leakage Evidence in Web Traffic
Lenders, Vincent
@tik.ee.ethz.ch Vincent Lenders armasuisse, Switzerland vincent.lenders@armasuisse.ch ABSTRACT This paper presents Horizon
Did the northeastern Gulf of Mexico become greener after the Deepwater Horizon oil spill?
Meyers, Steven D.
explosion occurred on the Deepwater Horizon (DWH) oil drilling platform in the northeastern Gulf of Mexico#12;Did the northeastern Gulf of Mexico become greener after the Deepwater Horizon oil spill ecosystem in the northeastern Gulf of Mexico (NEGOM) from the Deepwater Horizon oil spill (April July 2010
Genomic and physiological footprint of the Deepwater Horizon oil spill on resident marsh fishes
Whitehead, Andrew
-seq | toxicogenomics Following the Deepwater Horizon (DWH) drilling disaster on April 20, 2011, in the Gulf of MexicoGenomic 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
Thermoelectric DC conductivities and Stokes flows on black hole horizons
Elliot Banks; Aristomenis Donos; Jerome P. Gauntlett
2015-07-15
We consider a general class of electrically charged black holes of Einstein-Maxwell-scalar theory that are holographically dual to conformal field theories at finite charge density which break translation invariance explicitly. We examine the linearised perturbations about the solutions that are associated with the thermoelectric DC conductivity. We show that there is a decoupled sector at the black hole horizon which must solve generalised Stokes equations for a charged fluid. By solving these equations we can obtain the DC conductivity of the dual field theory. For one-dimensional lattices we solve the fluid equations to obtain closed form expressions for the DC conductivity in terms of the solution at the black hole horizon. We also determine the leading order DC conductivity for lattices that can be expanded as a perturbative series about translationally invariant solutions.
Thermoelectric DC conductivities and Stokes flows on black hole horizons
Banks, Elliot; Gauntlett, Jerome P
2015-01-01
We consider a general class of electrically charged black holes of Einstein-Maxwell-scalar theory that are holographically dual to conformal field theories at finite charge density which break translation invariance explicitly. We examine the linearised perturbations about the solutions that are associated with the thermoelectric DC conductivity. We show that there is a decoupled sector at the black hole horizon which must solve generalised Stokes equations for a charged fluid. By solving these equations we can obtain the DC conductivity of the dual field theory. For one-dimensional lattices we solve the fluid equations to obtain closed form expressions for the DC conductivity in terms of the solution at the black hole horizon. We also determine the leading order DC conductivity for lattices that can be expanded as a perturbative series about translationally invariant solutions.
Thermoelectric DC conductivities and Stokes flows on black hole horizons
Elliot Banks; Aristomenis Donos; Jerome P. Gauntlett
2015-10-11
We consider a general class of electrically charged black holes of Einstein-Maxwell-scalar theory that are holographically dual to conformal field theories at finite charge density which break translation invariance explicitly. We examine the linearised perturbations about the solutions that are associated with the thermoelectric DC conductivity. We show that there is a decoupled sector at the black hole horizon which must solve generalised Stokes equations for a charged fluid. By solving these equations we can obtain the DC conductivity of the dual field theory. For Q-lattices and one-dimensional lattices we solve the fluid equations to obtain closed form expressions for the DC conductivity in terms of the solution at the black hole horizon. We also determine the leading order DC conductivity for lattices that can be expanded as a perturbative series about translationally invariant solutions.
A model of eternal accelerated expansion without particle horizon
Wang, Zi-Liang
2016-01-01
In our previous paper \\cite{8}, we proposed a cosmological model from the emergence of space, which possesses a significant character of evaluating the vacuum energy from the Hubble constant and the age of universe. And one problem of this model is that there is no inflation in the early universe. In this paper, we aim at resolving this problem which leads us to a rather surprising conclusion that our cosmological model can avoid the horizon and flatness problems.
New Horizons in Gravity: Dark Energy and Condensate Stars
Emil Mottola
2011-07-25
Black holes are an apparently unavoidable prediction of classical General Relativity, at least if matter obeys the strong energy condition rho + 3p > 0. However quantum vacuum fluctuations generally violate this condition, as does the eq. of state of cosmological dark energy. When quantum effects are considered, black holes lead to a number of thermodynamic paradoxes associated with the Hawking temperature and assumption of black hole entropy, which are briefly reviewed. It is argued that the largest quantum effects arise from the conformal scalar degrees of freedom generated by the trace anomaly of the stress-energy tensor in curved space. At event horizons these can have macroscopically large backreaction effects on the geometry, potentially removing the classical event horizon of black hole and cosmological spacetimes, replacing them with a quantum phase boundary layer, where the effective value of the gravitational vacuum energy density can change. In the effective theory including the quantum effects of the anomaly, the cosmological term becomes a dynamical condensate, whose value depends upon boundary conditions at the horizon. By taking a positive value in the interior of a fully collapsed star, the effective cosmological term removes any singularity, replacing it with a smooth dark energy de Sitter interior. The resulting gravitational vacuum condensate star (or gravastar) configuration resolves all black hole paradoxes, and provides a testable alternative to black holes as the final quantum mechanical end state of complete gravitational collapse. The observed dark energy of our universe likewise may be a macroscopic finite size effect whose value depends not on Planck scale or other microphysics but on the cosmological Hubble horizon scale itself.
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 ...
A time and frequency domain analysis of contrarian trading strategies/
Chaudhuri, Shomesh E
2014-01-01
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 ...
Real-time Multi-period truckload routing problems
Limpaitoon, Tanachai
2008-01-01
In this thesis we consider a multi-period truckload pick-up and delivery problem dealing with real-time requests over a finite time horizon. We introduce the notion of postponement of requests, whereby the company can ...
Analogue White Hole Horizon and its Impact on Sediment Transport
Debasmita Chatterjee; Praloy Das; Subir Ghosh; B. S. Mazumder
2015-05-26
Motivated by the ideas of analogue gravity, we have performed experiments in a flume where an analogue White Hole horizon is generated, in the form of a wave blocking region, by suitably tuned uniform fluid (water) flow and counter-propagating shallow water waves. We corroborate earlier experimental observations by finding a critical wave frequency for a particular discharge above which the waves are effectively blocked beyond the horizon. An obstacle, in the form of a bottom wave, is introduced to generate a sharp blocking zone. All previous researchers used this obstacle. A novel part of our experiment is where we do not introduce the obstacle and find that wave blocking still takes place, albeit in a more diffused zone. Lastly we replace the fixed bottom wave obstacle by a movable sand bed to study the sediment transport and the impact of the horizon or wave blocking phenomenon on the sediment profile. We find signatures of the wave blocking zone in the ripple pattern.
Analogue White Hole Horizon and its Impact on Sediment Transport
Chatterjee, Debasmita; Ghosh, Subir; Mazumder, B S
2015-01-01
Motivated by the ideas of analogue gravity, we have performed experiments in a flume where an analogue White Hole horizon is generated, in the form of a wave blocking region, by suitably tuned uniform fluid (water) flow and counter-propagating shallow water waves. We corroborate earlier experimental observations by finding a critical wave frequency for a particular discharge above which the waves are effectively blocked beyond the horizon. An obstacle, in the form of a bottom wave, is introduced to generate a sharp blocking zone. All previous researchers used this obstacle. A novel part of our experiment is where we do not introduce the obstacle and find that wave blocking still takes place, albeit in a more diffused zone. Lastly we replace the fixed bottom wave obstacle by a movable sand bed to study the sediment transport and the impact of the horizon or wave blocking phenomenon on the sediment profile. We find signatures of the wave blocking zone in the ripple pattern.
Emergence of self-similarity in football dynamics
Kijima, Akifumi; Shima, Hiroyuki; Yamamoto, Yuji
2014-01-01
The multiplayer dynamics of a football game is analyzed to unveil self-similarities in the time evolution of player and ball positioning. Temporal fluctuations in both the team-turf boundary and the ball location are uncovered to follow the rules of fractional Brownian motion with a Hurst exponent of H=0.7. The persistence time below which self-similarity holds is found to be several tens of seconds, implying a characteristic time scale that governs far-from-equilibrium motion on a playing field.
Similarity-Based Retrieval for Biomedical Applications
Oliva, Aude
Similarity-based image retrieval is part of the case-based reasoning scenario. It allows for the retrieval visually similar images for advertising and market- ing. In the medical domain, similarity-based retrieval in this area has related to the design of distance measures for accurate retrieval in various application
Gödel black hole, closed timelike horizon, and the study of particle emissions
Sourav Bhattacharya; Anirban Saha
2010-07-22
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.
Banaji,. Murad
Diffusive Evolution of Gaseous and Diffusive Evolution of Gaseous and Hydrate Horizons of Methane in SeabedHydrate Horizons of Methane in Seabed Denis S. Goldobin (University of Leicester),Denis S. Goldobin"")) MethaneNetMethaneNet Early Career Workshop Early Career Workshop MiltonMilton KeynesKeynes 2929
Self-similar spherical shock solution with sustained energy injection
V. I. Dokuchaev
2002-09-20
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\
Ab initiomultireference in-medium similarity renormalization...
Office of Scientific and Technical Information (OSTI)
Details In-Document Search This content will become publicly available on October 23, 2015 Title: Ab initiomultireference in-medium similarity renormalization group calculations...
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.
EaglePicher Horizon Batteries LLC | 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTIONRobertsdale, AlabamaETEC GmbH Jump to: navigation, search Name: ETECMountain,EaglePicher Horizon
Formation of bubbly horizon in liquid-saturated porous medium by surface temperature oscillation
Goldobin, Denis S
2015-01-01
We study non-isothermal diffusion transport of a weakly-soluble substance in a liquid-saturated porous medium being in contact with the reservoir of this substance. The surface temperature of the porous medium half-space oscillates in time, which results in a decaying solubility wave propagating deep into the porous medium. In such a system, the zones of saturated solution and non-dissolved phase coexist with the zones of undersaturated solution. The effect is firstly considered for the case of annual oscillation of the surface temperature of water-saturated ground being in contact with atmosphere. We reveal the phenomenon of formation of a near-surface bubbly horizon due to the temperature oscillation. An analytical theory of the phenomenon is developed. Further, the treatment is extended to the case of higher frequency oscillations and case of weakly-soluble solids and liquids.
Formation of bubbly horizon in liquid-saturated porous medium by surface temperature oscillation
Denis S. Goldobin; Pavel V. Krauzin
2015-10-08
We study non-isothermal diffusion transport of a weakly-soluble substance in a liquid-saturated porous medium being in contact with the reservoir of this substance. The surface temperature of the porous medium half-space oscillates in time, which results in a decaying solubility wave propagating deep into the porous medium. In such a system, the zones of saturated solution and non-dissolved phase coexist with the zones of undersaturated solution. The effect is firstly considered for the case of annual oscillation of the surface temperature of water-saturated ground being in contact with atmosphere. We reveal the phenomenon of formation of a near-surface bubbly horizon due to the temperature oscillation. An analytical theory of the phenomenon is developed. Further, the treatment is extended to the case of higher frequency oscillations and case of weakly-soluble solids and liquids.
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
2014-12-31
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.
Non-equilibrium thermodynamics of dark energy on the power-law entropy corrected apparent horizon
M. Umar Farooq; Mubasher Jamil
2011-11-24
We investigate the Friedmann-Robertson-Walker (FRW) universe (containing dark energy) as a non-equilibrium (irreversible) thermodynamical system by considering the power-law correction to the horizon entropy. By taking power-law entropy area law which appear in dealing with the entanglement of quantum fields in and out the horizon, we determine the power-law entropy corrected apparent horizon of the FRW universe.
Stability of black holes based on horizon thermodynamics
Ma, Meng-Sen
2015-01-01
On the basis of horizon thermodynamics we study the thermodynamic stability of black holes constructed in general relativity and Gauss-Bonnet gravity. In the framework of horizon thermodynamics there are only five thermodynamic variables $E,P,V,T,S$. It is not necessary to consider concrete matter fields, which may contribute to the pressure of black hole thermodynamic system. In non-vacuum cases, we can derive the equation of state, $P=P(V,T)$. According to the requirements of stable equilibrium in conventional thermodynamics, we start from these thermodynamic variables to calculate the heat capacity at constant pressure and Gibbs free energy and analyze the local and global thermodynamic stability of black holes. It is shown that $P>0$ is the necessary condition for black holes in general relativity to be thermodynamically stable, however this condition cannot be satisfied by many black holes in general relativity. For black hole in Gauss-Bonnet gravity negative pressure can be feasible, but only local stab...
Stability of black holes based on horizon thermodynamics
Meng-Sen Ma; Ren Zhao
2015-11-11
On the basis of horizon thermodynamics we study the thermodynamic stability of black holes constructed in general relativity and Gauss-Bonnet gravity. In the framework of horizon thermodynamics there are only five thermodynamic variables $E,P,V,T,S$. It is not necessary to consider concrete matter fields, which may contribute to the pressure of black hole thermodynamic system. In non-vacuum cases, we can derive the equation of state, $P=P(V,T)$. According to the requirements of stable equilibrium in conventional thermodynamics, we start from these thermodynamic variables to calculate the heat capacity at constant pressure and Gibbs free energy and analyze the local and global thermodynamic stability of black holes. It is shown that $P>0$ is the necessary condition for black holes in general relativity to be thermodynamically stable, however this condition cannot be satisfied by many black holes in general relativity. For black hole in Gauss-Bonnet gravity negative pressure can be feasible, but only local stable black hole exists in this case.
Waters, Thomas J.; Nolan, Brien C.
2009-04-15
In this paper we consider gauge invariant linear perturbations of the metric and matter tensors describing the self-similar Lemaitre-Tolman-Bondi (timelike dust) spacetime containing a naked singularity. We decompose the angular part of the perturbation in terms of spherical harmonics and perform a Mellin transform to reduce the perturbation equations to a set of ordinary differential equations with singular points. We fix initial data so the perturbation is finite on the axis and the past null cone of the singularity, and follow the perturbation modes up to the Cauchy horizon. There we argue that certain scalars formed from the modes of the perturbation remain finite, indicating linear stability of the Cauchy horizon.
Giovannetti, Vittorio
We give a consistent quantum description of time, based on Page and Wootters’s conditional probabilities mechanism, which overcomes the criticisms that were raised against similar previous proposals. In particular we show ...
Conceptual combination: does similarity predict emergence?
Wilkenfeld, Merryl Joy
1995-01-01
Conceptual combination is used as a paradigm for investigating the influence of similarity on emergence. Subjects were 180 undergraduates recruited from the psychology subject pool. Pairs of parent concepts were selected for study using a...
Non-Hermitian Hamiltonians and similarity transformations
Francisco M. Fernández
2015-03-06
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.
Time Domain Partitioning of Electricity Production Cost Simulations
Barrows, C.; Hummon, M.; Jones, W.; Hale, E.
2014-01-01
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.
Lithophysal Rock Mass Mechanical Properties of the Repository Host Horizon
D. Rigby
2004-11-10
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
2012-04-06
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.
Deepwater Horizon crude oil impacts the developing hearts of large predatory pelagic fish
Grosell, Martin
Deepwater Horizon crude oil impacts the developing hearts of large predatory pelagic fish John P November 6, 2013) The Deepwater Horizon disaster released more than 636 million L of crude oil and larvae) of tunas, swordfish, and other large predators were potentially exposed to crude oil
Many Task Computing for Modeling the Fate of Oil Discharged from the Deep Water Horizon Well
Many Task Computing for Modeling the Fate of Oil Discharged from the Deep Water Horizon Well@jhu.edu Abstract--The Deep Water Horizon well blowout on April 20th 2010 discharged between 40,000 - 1.2 million@med.miami.edu O. M. Knio Dept of Mechanical Engineering Johns Hopkins University Baltimore, MD knio
Flood control of rivers with nonlinear model predictive control and moving horizon estimation
]. Several studies can be found in literature where MPC is used to control water systems [15], [16] and [5Flood control of rivers with nonlinear model predictive control and moving horizon estimation control (MPC) in combination with moving horizon estimation (MHE) can more effectively be used for flood
OFFICE OF RESPONSE AND RESTORATION ! EMERGENCY RESPONSE DIVISION Deepwater Horizon Oil
OFFICE OF RESPONSE AND RESTORATION ! EMERGENCY RESPONSE DIVISION Deepwater Horizon Oil: Characteristics and Concerns Oil spilled from the Deepwater Horizon wellhead has been accumulating in the environment of the Gulf of Mexico since April 20. This document describes the potential forms the oil may take
An introduction to local Black Hole horizons in the 3+1 approach to General Relativity
José Luis Jaramillo
2011-08-11
We present an introduction to dynamical trapping horizons as quasi-local models for black hole horizons, from the perspective of an Initial Value Problem approach to the construction of generic black hole spacetimes. We focus on the geometric and structural properties of these horizons aiming, as a main application, at the numerical evolution and analysis of black hole spacetimes in astrophysical scenarios. In this setting, we discuss their dual role as an "a priori" ingredient in certain formulations of Einstein equations and as an "a posteriori" tool for the diagnosis of dynamical black hole spacetimes. Complementary to the first-principles discussion of quasi-local horizon physics, we place an emphasis on the "rigidity" properties of these hypersurfaces and their role as privileged geometric probes into near-horizon strong-field spacetime dynamics.
Generalized second law of thermodynamics on the apparent horizon in modified Gauss-Bonnet gravity
Abdolmaleki, A
2015-01-01
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...
Merkens, Karlina Paul
2013-01-01
occurred on the Deepwater Horizon drilling rig, which wasBP Deepwater Horizon Oil Spill and O? shore Drilling, 2010]BP Deepwater Horizon Oil Spill and O?shore Drilling (2010).
Compact Similarity Joins Brent Bryan #1
Eberhardt, Frederick
interest, with applications in Geographical Information Systems, astron- omy, marketing analyzes of magnitude faster. I. INTRODUCTION In numerous applications, such as Geographical Information Systems, office of the similarity join result, while retaining all the information in the standard join. Our algorithms have
Drug-Target Interaction Predicates Combining Similarities
Daume III, Hal
Drug-Target Interaction Predicates DataSet Combining Similarities Collective Inference Collective Inference and Multi-Relational Learning for DrugTarget Interaction Prediction Shobeir Fakhraei1, Bert Huang1 and Lise Getoor1,2 Poly-pharmacology Drug Repurposing Drug-Target Interaction Network Studies
Maeda, Hideki; Harada, Tomohiro; Carr, B. J.
2008-01-15
We use a combination of numerical and analytical methods, exploiting the equations derived in a preceding paper, to classify all spherically symmetric self-similar solutions which are asymptotically Friedmann at large distances and contain a perfect fluid with equation of state p=({gamma}-1){mu} with 0<{gamma}<2/3. The expansion of the Friedmann universe is accelerated in this case. We find a one-parameter family of self-similar solutions representing a black hole embedded in a Friedmann background. This suggests that, in contrast to the positive pressure case, black holes in a universe with dark energy can grow as fast as the Hubble horizon if they are not too large. There are also self-similar solutions which contain a central naked singularity with negative mass and solutions which represent a Friedmann universe connected to either another Friedmann universe or some other cosmological model. The latter are interpreted as self-similar cosmological white hole or wormhole solutions. The throats of these wormholes are defined as two-dimensional spheres with minimal area on a spacelike hypersurface and they are all nontraversable because of the absence of a past null infinity.
Spherically symmetric self-similar solutions and their astrophysical and cosmological applications
B. J. Carr
2000-03-02
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.
Origin of matter and space-time in the big bang
Mathews, G. J.; Yamazaki, D.; Kusakabe, M.; Cheoun, M.-K.
2014-05-02
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.
Meyers, Steven D.
- 1 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling THE AMOUNT of the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling for the use of members responders assertions. 2 DEEPWATER HORIZON MC252 GULF INCIDENT OIL BUDGET [hereinafter OIL BUDGET] (Aug. 4
K. Karami; S. Ghaffari
2010-01-06
We investigate the validity of the generalized second law in irreversible thermodynamics in a non-flat FRW universe containing the interacting 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 the present time, the generalized second law in nonequilibrium thermodynamics is satisfied for the special range of the energy transfer constants.
The Geometric Invariants of Null Cartan Curves Under The Similarity Transformations
Hakan Simsek; Mustafa Özdemir
2015-04-07
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.
Earth Similarity Index with two free parameters
Chandra, Suresh; Sharma, Mohit K
2015-01-01
We have derived Earth Similarity Index (ESI) with two free parameters m and T. These free parameters are optimized with the consideration that the planet Mars is almost similar to the Earth. For the optimized values of free parameters, the interior-ESI, surface-ESI and ESI for some planets are calculated. The results for m = 0.8 and T = 0.8 are compared with the values obtained by Schulze-Makuch {\\it et al.} (2011). We have found that the exoplanet 55 Cnc f is within 10% away from the threshold value T. The exoplanets HD 69830 c, 55 Cnc c, 55 Cnc f, 61 Vir d and HIP 57050 b are found to have ESI within 10% from the threshold value.
Fredrick Michael
2010-05-22
Recently we have discussed the generalized parametrized Klein-Gordon equation for curved spacetime. We have also discussed its derivation from several approaches, the direct Feynman parametrization, the state function entropy or equivalently the information theory approach, and the stochastic differential equation approach. We have even suggested a generalization of the statistics of the entropy to the generalized entropies and derived the particular nonextensive statistics parametrized Klein-Gordon equation, and discussed its nonlinear FPE replacement of the complicated Gibbs-Boltzmann statistics entropy derived analog with complicated nonlinear potential or drift and diffusion coefficients. In this article we apply these previously derived results to the quantum transport in abruptly coupled curved space-time heterostructures, applied here specifically to Black-Hole event horizon coupling to normal curved space-time. We derive the coupling self energy, and the Garcia-Molliner surface Green's functions from which we can calculate the surface area and entropy. We then derive the nonequilibrium transport equations for the radiation from the Black-Hole. We discuss the theory application to Worm Holes and quantum analogues.
Application of initial data sequences to the study of Black Hole dynamical trapping horizons
Jaramillo, José Luis; Vasset, Nicolas; 10.1063/1.3141305
2011-01-01
Non-continuous "jumps" of Apparent Horizons occur generically in 3+1 (binary) black hole evolutions. The dynamical trapping horizon framework suggests a spacetime picture in which these "Apparent Horizon jumps" are understood as spatial cuts of a single spacetime hypersurface foliated by (compact) marginally outer trapped surfaces. We present here some work in progress which makes use of uni-parametric sequences of (axisymmetric) binary black hole initial data for exploring the plausibility of this spacetime picture. The modelling of Einstein evolutions by sequences of initial data has proved to be a successful methodological tool in other settings for the understanding of certain qualitative features of evolutions in restricted physical regimes.
New Horizons for Hydrogen: Producing Hydrogen from Renewable Resources
Not Available
2011-02-01
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.
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
114 Solar Irradiance And Power Output Variabilityand L. Bangyin. Online 24-h solar power forecasting based onNielsen. Online short-term solar power forecasting. Solar
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
From the k(t + 1) predictions, solar irradiance forecastsand M. Cony. Prediction of global solar irradiance based onand A. E. Ruano. Prediction of the solar radiation evolution
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
photovoltaic systems. Progress In Photovoltaics, 16(3):241–analytic model. Progress In Photovoltaics, 19(2):218–227,
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
Solar irradiance data . . . . . . . . . . . . .Irradiance . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Forecasting Solar Irradiance With GOES-West Satellite
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
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
2012-01-01
power producers, utility companies and independent systemby power producers, utility companies and independent system
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
Solar irradiance data . . . . . . . . . . . . .Accuracy . . . . . . . . . . . . . . . . . Solar Resourcev Uncertainty In Solar Resource: Forecasting
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
from satellite data. Solar Energy, 76:475–484, 2004. [59] CM16 independent data banks. Solar Energy, 80:468–478, 2006. [solar radiation data. Solar Energy , 81:768–772, 2007. [80
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
at Trieste, Italy. Solar Energy, 84(5):807–821, May 2010. [intelligence techniques. Solar Energy, 68(2):169–178, Febcover indices. ASME Journal of Solar Energy Engineering,, in
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
application to solar thermal power plants energy productionThe thermal radiance of clear skies. Solar Energy, 29:299–
Solar irradiance forecasting at multiple time horizons and novel methods to evaluate uncertainty
Marquez, Ricardo
2012-01-01
and forecasting of solar radiation data: a review. Int. J.beam and global solar radiation data. Solar Energy , 81:768–forecasting of solar radiation data: a review. International
Exploiting Data Similarity to Reduce Memory Footprints
Biswas, S; de Supinski, B R; Schulz, M; Franklin, D; Sherwood, T; Chong, F T
2011-01-28
Memory size has long limited large-scale applications on high-performance computing (HPC) systems. Since compute nodes frequently do not have swap space, physical memory often limits problem sizes. Increasing core counts per chip and power density constraints, which limit the number of DIMMs per node, have exacerbated this problem. Further, DRAM constitutes a significant portion of overall HPC system cost. Therefore, instead of adding more DRAM to the nodes, mechanisms to manage memory usage more efficiently - preferably transparently - could increase effective DRAM capacity and thus the benefit of multicore nodes for HPC systems. MPI application processes often exhibit significant data similarity. These data regions occupy multiple physical locations across the individual rank processes within a multicore node and thus offer a potential savings in memory capacity. These regions, primarily residing in heap, are dynamic, which makes them difficult to manage statically. Our novel memory allocation library, SBLLmalloc, automatically identifies identical memory blocks and merges them into a single copy. SBLLmalloc does not require application or OS changes since we implement it as a user-level library. Overall, we demonstrate that SBLLmalloc reduces the memory footprint of a range of MPI applications by 32.03% on average and up to 60.87%. Further, SBLLmalloc supports problem sizes for IRS over 21.36% larger than using standard memory management techniques, thus significantly increasing effective system size. Similarly, SBLLmalloc requires 43.75% fewer nodes than standard memory management techniques to solve an AMG problem.
New Horizons in Gravity: The Trace Anomaly, Dark Energy and Condensate Stars
Mottola, Emil
2010-01-01
General Relativity receives quantum corrections relevant at macroscopic distance scales and near event horizons. These arise from the conformal scalar degrees of freedom in the extended effective field theory of gravity generated by the trace anomaly of massless quantum fields in curved space. The origin of these conformal scalar degrees of freedom as massless poles in two-particle intermediate states of anomalous amplitudes in flat space is exposed. At event horizons the conformal anomaly scalar degrees of freedom can have macroscopically large effects on the geometry, potentially removing the classical event horizon of black hole and cosmological spacetimes, replacing them with a quantum boundary layer where the effective value of the gravitational vacuum energy density can change. In the effective theory, the cosmological term becomes a dynamical condensate, whose value depends upon boundary conditions near the horizon. In the conformal phase where the anomaly induced fluctutations dominate, and the conden...
New Horizons for Spatial Data Quality Research Suzie Larrive, Yvan Bdard, Marc Gervais & Tania Roy
New Horizons for Spatial Data Quality Research Suzie Larrivée, Yvan Bédard, Marc Gervais & Tania, Canada Suzie.Larrivee@scg.ulaval.ca, Yvan.Bedard@scg.ulaval.ca, Marc.Gervais@scg.ulaval.ca, Tania.Roy.2
FINDING KBO FLYBY TARGETS FOR NEW HORIZONS JOHN SPENCER and MARC BUIE
Young, Leslie A.
FINDING KBO FLYBY TARGETS FOR NEW HORIZONS JOHN SPENCER and MARC BUIE Lowell Observatory LESLIE maintained by Marc Buie at http://www.lowell.edu/buie/kbo/kbofollowup.html (histogram, right axis). The good
First law of thermodynamics for dynamical apparent horizons and the entropy of Friedmann universes
Viaggiu, Stefano
2015-01-01
Recently, we have generalized the Bekenstein-Hawking entropy formula for black holes embedded in expanding Friedmann universes. In this letter, we begin the study of this new formula to obtain the first law of thermodynamics for dynamical apparent horizons. In this regard we obtain a generalized expression for the internal energy $U$ together with a distinction between the dynamical temperature $T_D$ of apparent horizons and the related one due to thermodynamics formulas. Remarkable, when the expression for $U$ is applied to the apparent horizon of the universe, we found that this internal energy is a constant of motion. Our calculations thus show that the total energy of our spatially flat universe including the gravitational contribution, when calculated at the apparent horizon, is an universal constant that can be set to zero from simple dimensional considerations. This strongly support the holographic principle.
Cheong, So-Min
2014-01-01
The issue of whether adaptations to past disasters can impede adaptation to new disasters of a different type or intensity will be analyzed by examining the transition from frequent hurricanes to the Deepwater Horizon oil spill in coastal Louisiana...
US Hydro 2011 Tampa, FL April 2528, 2011 1 On the Horizon
New Hampshire, University of
US Hydro 2011 Tampa, FL April 2528, 2011 1 On the Horizon: Better Bottom Detection for areas the eelgrass canopy and seafloor. #12;US Hydro 2011 Tampa, FL April 2528, 2011 2 Figure 1: Bottom detections
Thermal Conductivity of the Potential Repository Horizon Model Report
J. Ramsey
2002-08-29
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.
Self-similar radiation from numerical Rosenau-Hyman compactons
Rus, Francisco Villatoro, Francisco R.
2007-11-10
The numerical simulation of compactons, solitary waves with compact support, is characterized by the presence of spurious phenomena, as numerically induced radiation, which is illustrated here using four numerical methods applied to the Rosenau-Hyman K(p, p) equation. Both forward and backward radiations are emitted from the compacton presenting a self-similar shape which has been illustrated graphically by the proper scaling. A grid refinement study shows that the amplitude of the radiations decreases as the grid size does, confirming its numerical origin. The front velocity and the amplitude of both radiations have been studied as a function of both the compacton and the numerical parameters. The amplitude of the radiations decreases exponentially in time, being characterized by a nearly constant scaling exponent. An ansatz for both the backward and forward radiations corresponding to a self-similar function characterized by the scaling exponent is suggested by the present numerical results.
A Real-time Framework for Model Predictive Control of Continuous-Time Nonlinear Systems
Sontag, Eduardo
for piecewise constant NMPC of continuous-time processes. Index Terms-- nonlinear model predictive control, real-time optimization, optimal control, piecewise constant control I. INTRODUCTION Model predictive control (MPC horizon, open-loop optimal control problem. The unprecedented industrial success of MPC ap- proaches based
INTERSTELLAR PICK-UP IONS OBSERVED BETWEEN 11 AND 22 AU BY NEW HORIZONS
Randol, B. M.; McComas, D. J.; Schwadron, N. A.
2013-05-10
We report new observations by the Solar Wind Around Pluto instrument on the New Horizons spacecraft, which measures energy per charge (E/q) spectra of solar wind and interstellar pick-up ions (PUIs) between 11 AU and 22 AU from the Sun. The data provide an unprecedented look at PUIs as there have been very few measurements of PUIs beyond 10 AU. We analyzed the PUI part of the spectra by comparing them to the classic Vasyliunas and Siscoe PUI model. Our analysis indicates that PUIs are usually well-described by this distribution. We derive parameters relevant to PUI studies, such as the ionization rate normalized to 1 AU. Our result for the average ionization rate between 11 and 12 AU agrees with an independently derived average value found during the same time. Later, we find a general increase in the ionization rate, which is consistent with the increase in solar activity. We also calculate the PUI thermal pressure, which appears to be roughly consistent with previous results. Through fitting of the solar wind proton peaks in our spectra, we derive solar wind thermal pressures. Based on our analysis, we predict a ratio of PUI thermal pressure to solar wind thermal pressure just inside the termination shock to be between 100 and >1000.
Parker, Alex H.; Holman, Matthew J.; McLeod, Brian A.; Buie, Marc W.; Borncamp, David M.; Spencer, John R.; Stern, S. Alan; Osip, David J.; Gwyn, Stephen D. J.; Fabbro, Sebastian; Kavelaars, J. J.; Benecchi, Susan D.; Sheppard, Scott S.; Binzel, Richard P.; DeMeo, Francesca E.; Fuentes, Cesar I.; Trilling, David E.; Gay, Pamela L.; Petit, Jean-Marc; Tholen, David J.; and others
2013-04-15
We present the discovery of a long-term stable L5 (trailing) Neptune Trojan in data acquired to search for candidate trans-Neptunian objects for the New Horizons spacecraft to fly by during an extended post-Pluto mission. This Neptune Trojan, 2011 HM{sub 102}, has the highest inclination (29. Degree-Sign 4) of any known member of this population. It is intrinsically brighter than any single L5 Jupiter Trojan at H{sub V} {approx} 8.18. We have determined its gri colors (a first for any L5 Neptune Trojan), which we find to be similar to the moderately red colors of the L4 Neptune Trojans, suggesting similar surface properties for members of both Trojan clouds. We also present colors derived from archival data for two L4 Neptune Trojans (2006 RJ{sub 103} and 2007 VL{sub 305}), better refining the overall color distribution of the population. In this document we describe the discovery circumstances, our physical characterization of 2011 HM{sub 102}, and this object's implications for the Neptune Trojan population overall. Finally, we discuss the prospects for detecting 2011 HM{sub 102} from the New Horizons spacecraft during its close approach in mid- to late-2013.
Monetary Policy, Nominal Interest Rates, and Long-horizon Inflation Uncertainty
Wright, Stephen M
2004-06-16
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...
Data-mined similarity function between material compositions
Yang, Lusann
A new method for assessing the similarity of material compositions is described. A similarity measure is important for the classification and clustering of compositions. The similarity of the material compositions is ...
Two Similarity Measure Approaches to Whole Building Fault Diagnosis
Lin, G.; Claridge, D.
2012-01-01
similarity are defined and the methodology for implementing the proposed whole building fault diagnosis approaches is presented. Cosine similarity and Euclidean distance similarity are applied to two field observed fault test cases, and both the cosine...
Small black holes on branes: Is the horizon regular or singular?
Karasik, D.; Sahabandu, C.; Suranyi, P.; Wijewardhana, L.C.R.
2004-09-15
We investigate the following question: Consider a small mass, with {epsilon} (the ratio of the Schwarzschild radius and the bulk curvature length) much smaller than 1, that is confined to the TeV brane in the Randall-Sundrum I scenario. Does it form a black hole with a regular horizon, or a naked singularity? The metric is expanded in {epsilon} and the asymptotic form of the metric is given by the weak field approximation (linear in the mass). In first order of {epsilon} we show that the iteration of the weak field solution, which includes only integer powers of the mass, leads to a solution that has a singular horizon. We find a solution with a regular horizon but its asymptotic expansion in the mass also contains half integer powers.
Anyonic statistics and large horizon diffeomorphisms for Loop Quantum Gravity Black Holes
Andreas G. A. Pithis; Hans-Christian Ruiz Euler
2015-03-24
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.
Quantization of area for event and Cauchy horizons of the Kerr-Newman black hole
Visser, Matt
2012-01-01
Based on various string theoretic constructions, there have been repeated suggestions that the areas of black hole event horizons should be quantized in a quite specific manner, involving linear combinations of square roots of natural numbers. It is important to realise the significant physical limitations of such proposals when one attempts to extend them outside their original framework. Specifically, in their most natural and direct physical interpretations, these specific proposals for horizon areas fail for the ordinary Kerr-Newman black holes in (3+1) dimensions, essentially because the fine structure constant is not an integer. A more baroque interpretation involves asserting the fine structure constant is the square root of a rational number; but such a proposal has its own problems. Insofar as one takes (3+1) general relativity (plus the usual quantization of angular momentum and electric charge) as being paramount, the known explicitly calculable spectra of horizon areas for the physically compellin...
Wave Properties of Plasma Surrounding the Event Horizon of a Non-Rotating Black Hole
M. Sharif; G. Mustafa
2008-09-09
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.
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.
Force-free magnetosphere on near-horizon geometry of near-extreme Kerr black holes
Huiquan Li; Cong Yu; Jiancheng Wang; Zhaoyi Xu
2015-04-03
We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.
Imaging the supermassive black hole shadow and jet base of M87 with the event horizon telescope
Lu, Ru-Sen; Fish, Vincent L.; Doeleman, Sheperd S.; Pankratius, Victor; Broderick, Avery E.; Baron, Fabien; Monnier, John D.
2014-06-20
The Event Horizon Telescope (EHT) is a project to assemble a Very Long Baseline Interferometry (VLBI) network of millimeter wavelength dishes that can resolve strong field general relativistic signatures near a supermassive black hole. As planned, the EHT will include enough dishes to enable imaging of the predicted black hole 'shadow', a feature caused by severe light bending at the black hole boundary. The center of M87, a giant elliptical galaxy, presents one of the most interesting EHT targets as it exhibits a relativistic jet, offering the additional possibility of studying jet genesis on Schwarzschild radius scales. Fully relativistic models of the M87 jet that fit all existing observational constraints now allow horizon-scale images to be generated. We perform realistic VLBI simulations of M87 model images to examine the detectability of the black shadow with the EHT, focusing on a sequence of model images with a changing jet mass load radius. When the jet is launched close to the black hole, the shadow is clearly visible both at 230 and 345 GHz. The EHT array with a resolution of 20-30 ?as resolution (?2-4 Schwarzschild radii) is able to image this feature independent of any theoretical models and we show that imaging methods used to process data from optical interferometers are applicable and effective for EHT data sets. We demonstrate that the EHT is also capable of tracing real-time structural changes on a few Schwarzschild radii scales, such as those implicated by very high-energy flaring activity of M87. While inclusion of ALMA in the EHT is critical for shadow imaging, the array is generally robust against loss of a station.
Grosell, Martin
Study: Exposure to crude oil from the Deepwater Horizon disaster causes swimming deficiencies of large fish Crude oil spreads across a wide swath of the Gulf of Mexico during the 2010 Deepwater Horizon. The four million barrels of crude oil that spewed into the Gulf of Mexico from BP's failed oil drilling
Chmura, Gail L.
marsh samples has advantages over other coring methods. By freezing the salt marsh soil in CryogenicUsing Marker Horizons and Cryogenic Coring to Monitor Sediment Deposition in Salt Marshes that has accumulated over the marker horizon is measured. Cryogenic coring is one method of extracting
SC-RISE LECTURE SERIES BRIGHT HORIZONS IN SOLAR ENERGY
are being developed including biomass, geothermal, hydropower, ocean thermal energy conversion, solar in technology development. The high capital costs typical of sustainable technologies coupled with the cyclic Time: 3:00 PM Location: A265 Bourns Hall Abstract: Low cost energy is critical to our lifestyles
New insights into microbial responses to oil spills from the Deepwater Horizon incident
Mason, O.U.; Hazen, T.C.
2011-06-15
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
DR. DONALD BOESCH NATIONAL COMMISSION ON THE BP DEEPWATER HORIZON OIL SPILL AND
Boynton, Walter R.
, as the rig's crew completed drilling the exploratory Macondo well deep under the waters of the Gulf of Mexico AND OFFSHORE DRILLING AND TERRY D. GARCIA NATIONAL COMMISSION ON THE BP DEEPWATER HORIZON OIL SPILL AND OFFSHORE DRILLING BEFORE THE COMMITTEE ON TRANSPORTATION AND INFRASTRUCTURE SUBCOMMITTEE ON COAST GUARD
Draft Horizon 2020 Work Programme 2016-2017 in the area of
Greifswald, Ernst-Moritz-Arndt-Universität
installation packages integrating renewable and energy efficiency solutions for heating, cooling and/or hot and Efficient Energy" Important notice: This paper is made public just before the adoption process of the work. The Commission expressly disclaims liability for any future changes of the content of this document. #12;HORIZON
Tokyo Tech International Symposium New Horizon of Electronic Materials Using Abundant Elements
University, Sweden) In Harmony with the Environment: New Materials Harnessing Nature's Energy Flows 14Tokyo Tech International Symposium New Horizon of Electronic Materials Using Abundant Elements Date Theoretical and Computational Approach to New Materials Date: 10:00-19:00, 4th June, 2015: Lecture Session 10
Tracking Oil from the Deepwater Horizon Oil Spill in Barataria Bay Sediments
Dincer, Zeynep
2013-05-03
In April 2010, approximately 4.9 million barrels of oil were accidentally released into the Gulf of Mexico during the Deepwater Horizon Macondo Mc252 Oil Spill. Some of the surface oil was carried by prevailing winds and currents and reached...
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
Draft Horizon 2020 Work Programme 2016-2017 in the area of Transport
Greifswald, Ernst-Moritz-Arndt-Universität
of this document. #12;HORIZON 2020 - Work Programme 2016 - 2017 Smart, green and integrated transport Part 11 ......................................................................................................................... 11 MG-1.1-2016: Reducing energy consumption and environmental impact of aviation........ 12 MG-1................................................................................................................. 19 MG-2.1-2017: Innovations for energy efficiency and emission control in waterborne transport
DeepwaterHorizonOilSpill DraftPhaseIIEarlyRestorationPlan
Authority; Department of Environmental Quality; Department of Wildlife and Fisheries; Department of Natural) is a priceless national treasure. Its natural resources water, fish, beaches, reefs, marshes, oil and gas Review Prepared by the Deepwater Horizon Natural Resource Trustees from State of Alabama (Department
Proof of linear instability of the Reissner-Nordström Cauchy horizon under scalar perturbations
Jonathan Luk; Sung-Jin Oh
2015-01-19
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.
ALICE: The Ultraviolet Imaging Spectrograph aboard the New Horizons Pluto-Kuiper Belt Mission
Stern, S. Alan
ABSTRACT The New Horizons ALICE instrument is a lightweight (4.4 kg), low-power (4.4 Watt) imaging-ALICE, for Pluto-ALICE) is a compact, low-cost instrument designed to perform spectroscopic investigations at Southwest Research Institute (SwRI) in the mid-1990s with funds from NASA, JPL, and SwRI1 . Later, the HIPPS
The New Horizons GeometryVisualizer: Planning the Encounter with Pluto
Throop, Henry
institution: SwRI 2006 launch; 2015 Pluto #12;#12;#12;New Horizons iPhone Camera 1 MP 2 MP Storage 16 GB 16 GB the whole planet? · Designed as a `sandbox' for planning observations. · Not used to program commands into spacecraft. What does GV do? #12;GV Design Goals Priority 2: · Features · Ease of use · Speed · Ease
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
Financement avec l'Europe: quel horizon pour l'UdeM ?
Charette, André
Financement avec l'Europe: quel horizon pour l'UdeM ? Midi-BRDV 15 mai 2014 Sophie Gauthier travail pour la subvention et 50 % de leur temps de travail en Europe · Consolidator Grant (objectif: 400 subvention et 50 % de son temps de travail en Europe · Advanced Grant (objectif: 200 pour 2014): chercheur
Olaf Dreyer
2009-04-22
Attempts to quantize general relativity encounter an odd problem. The Hamiltonian that normally generates time evolution vanishes in the case of general relativity as a result of diffeomorphism invariance. The theory seems to be saying that time does not exist. The most obvious feature of our world, namely that time seems to progress and that the world changes accordingly becomes a problem in this presumably fundamental theory. This is called the problem of time. In this essay we argue that this problem is the result of an unphysical idealization. We are caught in this "problem of time" trap because we took a wrong turn in the early days of relativity by permanently including a split of geometry and matter into our physical theories. We show that another possibility exists that circumvents the problem of time and also sheds new light on other problems like the cosmological constant problem and the horizon problem in early universe cosmology.
Comparing Harmonic Similarity Measures W. Bas de Haas1
Veltkamp, Remco
Comparing Harmonic Similarity Measures W. Bas de Haas1 , Matthias Robine2 , Pierre Hanna2 , Remco C in which we compare two harmonic similarity measures. In contrast to earlier work, in this paper we approach to harmonic similarity, and measure the effects of chord descrip- tion detail and a priori key
Redefining similarity in a thesaurus by using corpora Hiroyuki Shinnou
Redefining similarity in a thesaurus by using corpora Hiroyuki Shinnou Ibar~ki University Dept- ally used in various domains. By these similarities, we can construct a large and general thesaurus two nouns. The similarity is usu- ally calculated from a thesaurus. Since a hand- made thesaurus
Equilateral Non-Gaussianity and New Physics on the Horizon
Daniel Baumann; Daniel Green
2011-03-23
We examine the effective theory of single-field inflation in the limit where the scalar perturbations propagate with a small speed of sound. In this case the non-linearly realized time-translation symmetry of the Lagrangian implies large interactions, giving rise to primordial non-Gaussianities. When the non-Gaussianities are measurable, these interactions will become strongly coupled unless new physics appears close to the Hubble scale. Due to its proximity to the Hubble scale, the new physics is not necessarily decoupled from inflationary observables and can potentially affect the predictions of the model. To understand the types of corrections that may arise, we construct weakly-coupled completions of the theory and study their observational signatures.
On the Lack of Type I X-ray Bursts in Black Hole X-ray Binaries: Evidence for the Event Horizon?
Ramesh Narayan; Jeremy S. Heyl
2002-06-28
Type I X-ray bursts are very common in neutron star X-ray binaries, but no Type I burst has been seen in the dozen or so binaries in which the accreting compact star is too massive to be a neutron star and therefore is identified as a black hole candidate. We have carried out a global linear stability analysis of the accumulating fuel on the surface of a compact star to identify the conditions under which thermonuclear bursts are triggered. Our analysis, which improves on previous calculations, reproduces the gross observational trends of bursts in neutron star systems. It further shows that, if black hole candidates have surfaces, they would very likely exhibit instabilities similar to those that lead to Type I bursts on neutron stars. The lack of bursts in black hole candidates is thus significant, and indicates that these objects have event horizons. We discuss possible caveats to this conclusion.
Stability analysis of self-similar behaviors in perfect fluid gravitational collapse
Mitsuda, Eiji; Tomimatsu, Akira
2006-06-15
Stability of self-similar solutions for gravitational collapse is an important problem to be investigated from the perspectives of their nature as an attractor, critical phenomena, and instability of a naked singularity. In this paper we study spherically symmetric non-self-similar perturbations of matter and metrics in spherically symmetric self-similar backgrounds. The collapsing matter is assumed to be a perfect fluid with the equation of state P={alpha}{rho}. We construct a single wave equation governing the perturbations, which makes their time evolution in arbitrary self-similar backgrounds analytically tractable. Further we propose an analytical application of this master wave equation to the stability problem by means of the normal mode analysis for the perturbations having the time dependence given by exp(i{omega}log vertical t vertical bar), and present some sufficient conditions for the absence of nonoscillatory unstable normal modes with purely imaginary {omega}.
Solar Wind at 33 AU: Setting Bounds on the Pluto Interaction for New Horizons
Bagenal, F; Elliott, H A; Hill, M E; Lisse, C M; McComas, D J; McNutt,, R L; Richardson, J D; Smith, C W; Strobel, D F
2015-01-01
The NASA New Horizons spacecraft flies past Pluto on July 14, 2015, carrying two instruments that detect charged particles. Pluto has a tenuous, extended atmosphere that is escaping the weak gravity of the planet. The interaction of the solar wind with the escaping atmosphere of Pluto depends on solar wind conditions as well as the vertical structure of the atmosphere. We have analyzed Voyager 2 particles and fields measurements between 25 and 39 AU and present their statistical variations. We have adjusted these predictions to allow for the declining activity of the Sun and solar wind output. We summarize the range of SW conditions that can be expected at 33 AU and survey the range of scales of interaction that New Horizons might experience. Model estimates for the solar wind stand-off distance vary from approximately 7 to 1000 RP with our best estimate being around 40 RP (where we take the radius of Pluto to be RP=1184 km).
Hamilton-Jacobi Tunneling Method for Dynamical Horizons in Different Coordinate Gauges
Roberto Di Criscienzo; Sean A. Hayward; Mario Nadalini; Luciano Vanzo; Sergio Zerbini
2009-12-03
Previous work on dynamical black hole instability is further elucidated within the Hamilton-Jacobi method for horizon tunneling and the reconstruction of the classical action by means of the null-expansion method. Everything is based on two natural requirements, namely that the tunneling rate is an observable and therefore it must be based on invariantly defined quantities, and that coordinate systems which do not cover the horizon should not be admitted. These simple observations can help to clarify some ambiguities, like the doubling of the temperature occurring in the static case when using singular coordinates, and the role, if any, of the temporal contribution of the action to the emission rate. The formalism is also applied to FRW cosmological models, where it is observed that it predicts the positivity of the temperature naturally, without further assumptions on the sign of the energy.
New Cosmologies on the Horizon. Cosmology and Holography in bigravity and massive gravity
Tolley, Andrew James
2013-03-31
The goal of this research program is to explore the cosmological dynamics, the nature of cosmological and black hole horizons, and the role of holography in a new class of infrared modified theories of gravity. This will capitalize of the considerable recent progress in our understanding of the dynamics of massive spin two fields on curved spacetimes, culminating in the formulation of the first fully consistent theories of massive gravity and bigravity/bimetric theories.
Syntactic Features and Word Similarity for Supervised Metonymy Malvina Nissim
Markert, Katja
).2 In (2), "Pakistan", the name of a location, refers to one of its national sports teams.3 (2) Pakistan://info.ox.ac.uk/bnc). #12;Scotland subj-of subj-of win lose context reduction Pakistan Scotland-subj-of-losePakistan-subj-of-win similarity semantic class head similarity role similarity Pakistan had won the World Cup lost in the semi
Holographic Space-time and Black Holes: Mirages As Alternate Reality
Tom Banks; Willy Fischler; Sandipan Kundu; Juan F. Pedraza
2014-01-30
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.
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
IMAGING THE SUPERMASSIVE BLACK HOLE SHADOW AND JET BASE OF M87 WITH THE EVENT HORIZON TELESCOPE
Lu, Ru-Sen
The Event Horizon Telescope (EHT) is a project to assemble a Very Long Baseline Interferometry (VLBI) network of millimeter wavelength dishes that can resolve strong field general relativistic signatures near a supermassive ...
Non-commutative Einstein-Proca Space-time
Blanca Gónzales; Román Linares; Marco Maceda; Oscar Sánchez-Santos
2014-09-12
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.
THE SIMILARITY-IN-TOPOGRAPHY PRINCIPLE: RECONCILING THEORIES OF CONCEPTUAL
Barsalou, Lawrence W.
THE SIMILARITY-IN-TOPOGRAPHY PRINCIPLE: RECONCILING THEORIES OF CONCEPTUAL DEFICITS W. Kyle Simmons deficits, and offer different insights into their origins. Conceptual topography theory (CTT) integrates it with the similarity-in-topography (SIT) principle. According to CTT, feature maps in sensory-motor systems represent
Social similarity favors cooperation: the distributed content replication case
Stavrakakis, Ioannis
-off the individual with the social benefit. More specifically, we investigate the impact of social similarity1 Social similarity favors cooperation: the distributed content replication case Eva Jaho within a social group can dictate the behavior of the individual nodes, so as to best trade
Measuring Test Case Similarity to Support Test Suite Understanding
Zaidman, Andy
Measuring Test Case Similarity to Support Test Suite Understanding Michaela Greiler, Arie van.e.zaidman}@tudelft.nl Abstract. In order to support test suite understanding, we investigate whether we can automatically derive relations between test cases. In par- ticular, we search for trace-based similarities between (high
Designing Integrated Accelerator for Stream Ciphers with Structural Similarities
International Association for Cryptologic Research (IACR)
Designing Integrated Accelerator for Stream Ciphers with Structural Similarities Sourav Sen Gupta1PAcc-LTE, a high performance integrated design that combines the two ciphers in hardware, based on their structural core supporting multiple designs having similar algorithmic structures. Keywords: Stream Ciphers
Short Communication Similarity considerations in adhesive contact problems
Awtar, Shorya
Short Communication Similarity considerations in adhesive contact problems J.R. Barber n Department online 4 July 2013 Keywords: Adhesion van der Waal's forces Similarity JKR theory a b s t r a c of the adhesive force law. & 2013 Elsevier Ltd. All rights reserved. 1. Introduction Contact problems involving
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
Psaltis, Dimitrios; Kramer, Michael
2015-01-01
The black hole in the center of the Milky Way, Sgr A*, has the largest mass-to-distance ratio among all known black holes in the Universe. This property makes Sgr A* the optimal target for testing the gravitational no-hair theorem. In the near future, major developments in instrumentation will provide the tools for high-precision studies of its spacetime via observations of relativistic effects in stellar orbits, in the timing of pulsars, and in horizon-scale images of its accretion flow. We explore here the prospect of measuring the properties of the black-hole spacetime using all these three types of observations. We show that the correlated uncertainties in the measurements of the black-hole spin and quadrupole moment using the orbits of stars and pulsars are nearly orthogonal to those obtained from measuring the shape and size of the shadow the black hole casts on the surrounding emission. Combining these three types of observations will, therefore, allow us to assess and quantify systematic biases and un...
Office of Energy Efficiency and Renewable Energy (EERE)
Future mining will be from deeper and thinner seams; profiles of deep coal seams reveal multiple levels of coal and sediment strata or layers. Some of these layers contain greater levels of...
Extended self-similarity of atmospheric boundary layer wind fields in mesoscale regime: Is it real?
Kiliyanpilakkil, V P
2015-01-01
In this letter, we study the scaling properties of multi-year observed and atmospheric model-generated wind time series. We have found that the extended self-similarity holds for the observed series, and remarkably, the scaling exponents corresponding to the meoscale range closely match the well-accepted inertial-range turbulence values. However, the scaling results from the simulated time series are significantly different.
Cosine Similarity Scoring without Score Normalization Techniques Najim Dehak1
by the Department of Defense under Air Force Contract FA8721-05-C-0002. Opinions, interpretations, conclu- sions as follows. In Section 1.1, we de- scribe the total variability space and the original cosine similar- ity
Simultaneous Registration of Multiple Images: Similarity Metrics and Efficient Optimization
Wachinger, Christian
We address the alignment of a group of images with simultaneous registration. Therefore, we provide further insights into a recently introduced framework for multivariate similarity measures, referred to as accumulated ...
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
Sizing Sketches: A Rank-Based Analysis for Similarity Search
Makarychev, Konstantin
filtering accuracy while reducing the metadata space requirement and speed- ing up similarity searches a challenging problem because feature-rich data objects such as images, audio, and other sensor data
Are older people misled by perceptual similarity in recognition memory?
Grindlay, Sittha
2011-01-01
recognition in young and old adults. New words were tested under two conditions: perceptually similar (presented in studied fonts) or perceptually dissimilar (presented in novel fonts). There were two old adult groups and one young adult group. Each word...
Research Articles Combining Drug and Gene Similarity Measures
Sharan, Roded
of drug-drug and gene-gene similarity measures, combined with a logistic regression component to detection problems due to multiple gene and compound names. Additional attempts were based on reverse
Chern--Simons--Yang--Mills system in presence of Gribov horizon with fundamental Higgs matter
Arturo J. Gomez; Sebastian Gonzalez; Silvio P. Sorella
2015-09-29
In this work we study the behaviour of Yang--Mills--Chern--Simons theory coupled to a Higgs field in the fundamental representation by taking into account the effects of the presence of the Gribov horizon. By analyzing the infrared structure of the gauge field propagator, both confined and de-confined regions can be detected. The confined region corresponds to the appearance of complex poles in the propagators, while the de-confined one to the presence of real poles. One can move from one region to another by changing the parameters of the theory.
Hagedorn String Thermodynamics in Curved Spacetimes and near Black Hole Horizons
Thomas G. Mertens
2015-06-25
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.
The New Horizons Pluto Kuiper belt Mission: An Overview with Historical Context
S. Alan Stern
2007-09-27
NASA's New Horizons (NH) Pluto-Kuiper belt (PKB) mission was launched on 19 January 2006 on a Jupiter Gravity Assist (JGA) trajectory toward the Pluto system for a 14 July 2015 closest approach; Jupiter closest approach occurred on 28 February 2007. It was competitively selected by NASA for development on 29 November 2001. New Horizons is the first mission to the Pluto system and the Kuiper belt; and will complete the reconnaissance of the classical planets. The ~400 kg spacecraft carries seven scientific instruments, including imagers, spectrometers, radio science, a plasma and particles suite, and a dust counter built by university students. NH will study the Pluto system over a 5-month period beginning in early 2015. Following Pluto, NH will go on to reconnoiter one or two 30-50 kilometer diameter Kuiper belt Objects (KBOs), if NASA approves an extended mission. If successful, NH will represent a watershed development in the scientific exploration of a new class of bodies in the solar system - dwarf planets, of worlds with exotic volatiles on their surfaces, of rapidly (possibly hydrodynamically) escaping atmospheres, and of giant impact derived satellite systems. It will also provide the first dust density measurements beyond 18 AU, cratering records that shed light on both the ancient and present-day KB impactor population down to tens of meters, and a key comparator to the puzzlingly active, former dwarf planet (now satellite of Neptune) called Triton, which is as large as Eris and Pluto.
Discrete Cosmological Self-Similarity And Delta Scuti Stars
R. L. Oldershaw
2008-10-08
Within the context of a fractal paradigm that emphasizes nature's well-stratified hierarchical organization, the delta Scuti class of variable stars is investigated for evidence of discrete cosmological self-similarity. Methods that were successfully applied to the RR Lyrae class of variable stars are used to identify Atomic Scale analogues to delta Scuti stars and their relevant range of energy levels. The mass, pulsation mode and fundamental oscillation period of a well-studied delta Scuti star are shown to be quantitatively self-similar to the counterpart parameters of a uniquely identified Atomic Scale analogue. Several additional tests confirm the specificity of the discrete fractal relationship.
A class of self-similar hydrodynamics test problems
Ramsey, Scott D [Los Alamos National Laboratory; Brown, Lowell S [Los Alamos National Laboratory; Nelson, Eric M [Los Alamos National Laboratory; Alme, Marv L [Los Alamos National Laboratory
2010-12-08
We consider self-similar solutions to the gas dynamics equations. One such solution - a spherical geometry Gaussian density profile - has been analyzed in the existing literature, and a connection between it, a linear velocity profile, and a uniform specific internal energy profile has been identified. In this work, we assume the linear velocity profile to construct an entire class of self-similar sol utions in both cylindrical and spherical geometry, of which the Gaussian form is one possible member. After completing the derivation, we present some results in the context of a test problem for compressible flow codes.
Rehabilitating space-times with NUTs
Clément, Gérard; Guenouche, Mourad
2015-01-01
We revisit the Taub-NUT solution of the Einstein equations without time periodicity condition, showing that the Misner string is still fully transparent for geodesics. In this case, analytic continuation can be carried out through both horizons leading to a Hausdorff spacetime without a central singularity, and thus geodesically complete. Furthermore, we show that, in spite of the presence of a region containing closed time-like curves, there are no closed causal {\\em geodesics}. Thus, some longstanding obstructions to accept the Taub-NUT solution as physically relevant are removed.
Rehabilitating space-times with NUTs
Gérard Clément; Dmitri Gal'tsov; Mourad Guenouche
2015-08-30
We revisit the Taub-NUT solution of the Einstein equations without time periodicity condition, showing that the Misner string is still fully transparent for geodesics. In this case, analytic continuation can be carried out through both horizons leading to a Hausdorff spacetime without a central singularity, and thus geodesically complete. Furthermore, we show that, in spite of the presence of a region containing closed time-like curves, there are no closed causal {\\em geodesics}. Thus, some longstanding obstructions to accept the Taub-NUT solution as physically relevant are removed.
Quantitative similarity analysis of small-break loss-of-coolant accident scenarios
Prosek, A.; Kljenak, I.; Mavko, B. [Univ. of Ljubljana (Slovenia). Jozef Stefan Inst.
1996-07-01
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.
Naked Singularities in Spherically Symmetric, Self-Similar Spacetimes
Sanjay M. Wagh; Keshlan S. Govinder
2001-12-24
We show that all known naked singularities in spherically symmetric self-similar spacetimes arise as a result of singular initial matter distribution. This is a result of the peculiarity of the coordinate transformation that takes these spacetimes into a separable form. Therefore, these examples of naked singularities are of no apparent consequence to astrophysical observations or theories.
SIMILARITY MEASURES FOR EXAM TIMETABLING E. K. Burke
McCollum, Barry
of these algorithms have been developed specifically to solve one partic- ular problem instance or a small subset is that an algorithm used to find a good solution to one problem will also produce a good result for a "similar in this measure is presented with a discussion of how the definition of good impacts on this. Keywords
Shape Similarity Measures for the Design of Small RNA Switches
Barash, Danny
Shape Similarity Measures for the Design of Small RNA Switches http://www.jbsdonline.com Abstract Conformational switching in the secondary structure of RNAs has recently attracted consid- erable attention that were found in bacteria and offer a unique regulation mechanism based on switching between two highly
From Distributional to Semantic Similarity James Richard Curran
Curran, James R.
From Distributional to Semantic Similarity James Richard Curran TH E U N I V E R S ITY OF E D I N B in Chapter 3, Massi- miliano Ciaramita providing his supersense data used in Chapter 6 and Robert Curran
Mining gene sets for measuring similarities CHRISTINE NARDINI1
Nardini, Christine
Mining gene sets for measuring similarities CHRISTINE NARDINI1 , DANIELE MASOTTI2 , SUNGROH YOON3 and data mining of these new, large types of data. The proliferation of devices able to process in paral of number of genes under different environmental conditions. Data mining algorithms demanded to the analysis
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
THE IMPORTANCE OF SEQUENCES IN MUSICAL SIMILARITY Michael Casey
Casey, Michael
-level music information retrieval. A number of audio anal- ysis problems are solved successfully by using improvement in performance for audio similarity mea- sures using temporal sequences of features, and we show in tempo- ral matching of musical signals, and describes approaches that are amenable to fast hashing
Factors Affecting Web Page Similarity Anastasios Tombros and Zeeshan Ali
Tombros, Tassos
Factors Affecting Web Page Similarity Anastasios Tombros and Zeeshan Ali Department of Computer increasingly important on the Web. Sim- ilarity between web pages is a concept that is central to such tools. In this paper, we examine the effect that content and layout-related as- pects of web pages have on web page
NEWS AND VIEWS Alternative splicing variability: exactly how similar
Ares Jr., Manny
NEWS AND VIEWS Alternative splicing variability: exactly how similar are two identical cells and provide the first direct view of alternative splicing at the single cell level. Early hints that alternative splicing might vary within an isogenic cell population came from studies using clever dual
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
Controversy Corner On the similarity between requirements and architecture q
van Vliet, Hans
Controversy Corner On the similarity between requirements and architecture q Remco C. de Boer 2008 Accepted 1 November 2008 Available online 17 November 2008 Keywords: Software architecture Requirements Architectural knowledge a b s t r a c t Many would agree that there is a relationship between
Similarity-Index Early Seizure Detector VLSI Architecture
Genov, Roman
Similarity-Index Early Seizure Detector VLSI Architecture Amogh Vidwans, Karim Abdelhalim, Roman: {roman}@eecg.utoronto.ca Abstract-- A low power VLSI architecture implementing an algorithm for early by intractable epilepsy, and neurologists believe that stimulating the right neuronal cells with short electrical
Upper bound for entropy in asymptotically de Sitter space-time
Kengo Maeda; Tatsuhiko Koike; Makoto Narita; Akihiro Ishibashi
1997-12-05
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.
A fingerprint based metric for measuring similarities of crystalline structures
Zhu, Li; Fuhrer, Tobias; Schaefer, Bastian; Faraji, Somayeh; Rostami, Samara; Ghasemi, S Alireza; Sadeghi, Ali; Grauzinyte, Migle; Wolverton, Christopher; Goedecker, Stefan
2015-01-01
Measuring similarities/dissimilarities between atomic structures is important for the exploration of potential energy landscapes. However, the cell vectors together with the coordinates of the atoms, which are generally used to describe periodic systems, are quantities not suitable as fingerprints to distinguish structures. Based on a characterization of the local environment of all atoms in a cell we introduce crystal fingerprints that can be calculated easily and allow to define configurational distances between crystalline structures that satisfy the mathematical properties of a metric. This distance between two configurations is a measure of their similarity/dissimilarity and it allows in particular to distinguish structures. The new method is an useful tool within various energy landscape exploration schemes, such as minima hopping, random search, swarm intelligence algorithms and high-throughput screenings.
Similarity-based semi-local estimation of EMOS models
Lerch, Sebastian
2015-01-01
Weather forecasts are typically given in the form of forecast ensembles obtained from multiple runs of numerical weather prediction models with varying initial conditions and physics parameterizations. Such ensemble predictions tend to be biased and underdispersive and thus require statistical postprocessing. In the ensemble model output statistics (EMOS) approach, a probabilistic forecast is given by a single parametric distribution with parameters depending on the ensemble members. This article proposes two semi-local methods for estimating the EMOS coefficients where the training data for a specific observation station are augmented with corresponding forecast cases from stations with similar characteristics. Similarities between stations are determined using either distance functions or clustering based on various features of the climatology, forecast errors, ensemble predictions and locations of the observation stations. In a case study on wind speed over Europe with forecasts from the Grand Limited Area...
Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics
Kabir, Mashud
2009-01-01
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...
Geography and similarity of regional cuisines in China
Zhu, Yu-Xiao; Zhang, Zi-Ke; Zhang, Qian-Ming; Zhou, Tao; Ahn, Yong-Yeol
2013-01-01
Food occupies a central position in every culture and it is therefore of great interest to understand the evolution of food culture. The advent of the World Wide Web and online recipe repositories has begun to provide unprecedented opportunities for data-driven, quantitative study of food culture. Here we harness an online database documenting recipes from various Chinese regional cuisines and investigate the similarity of regional cuisines in terms of geography and climate. We found that the geographical proximity, rather than climate proximity is a crucial factor that determines the similarity of regional cuisines. We develop a model of regional cuisine evolution that provides helpful clues to understand the evolution of cuisines and cultures.
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.
2011-06-15
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.
Hot Plasma Modes Across Reissner-Nordstrom de Sitter Horizon in a Veselago Medium
Ifra Noureen; Hafiza Rizwana Kausar
2015-09-11
In this manuscript, wave attributes of hot plasma around Reissner- Nordstrom-de Sitter (RN-dS) metric in a Veselago medium are in- vestigated. General relativistic magnetohydrodynamical (GRMHD) equations in planar coordinates for the RN-dS horizon are reformulated by implementation of ADM 3+1 technique. Further, perturba- tion scheme is used to arrive at linearly perturbed GRMHD equations whose component form is used to attain dispersion relations for rotating (non-magnetized and magnetized) plasma. Wave propagation in hot plasma is explained by three dimensional graphical representation of the wave number, refractive index, its change with respect to angular velocity, phase and group velocities. Finally, comparison of wave properties is presented, results reassert the presence of Veselago medium.
Hot Plasma Modes Across Reissner-Nordstrom de Sitter Horizon in a Veselago Medium
Noureen, Ifra
2015-01-01
In this manuscript, wave attributes of hot plasma around Reissner- Nordstrom-de Sitter (RN-dS) metric in a Veselago medium are in- vestigated. General relativistic magnetohydrodynamical (GRMHD) equations in planar coordinates for the RN-dS horizon are reformulated by implementation of ADM 3+1 technique. Further, perturba- tion scheme is used to arrive at linearly perturbed GRMHD equations whose component form is used to attain dispersion relations for rotating (non-magnetized and magnetized) plasma. Wave propagation in hot plasma is explained by three dimensional graphical representation of the wave number, refractive index, its change with respect to angular velocity, phase and group velocities. Finally, comparison of wave properties is presented, results reassert the presence of Veselago medium.
The Pluto system: Initial results from its exploration by New Horizons
Stern, S A; Ennico, K; Gladstone, G R; Grundy, W M; McKinnon, W B; Moore, J M; Olkin, C B; Spencer, J R; Weaver, H A; Young, L A; Andert, T; Andrews, J; Banks, M; Bauer, B; Bauman, J; Barnouin, O S; Bedini, P; Beisser, K; Beyer, R A; Bhaskaran, S; Binzel, R P; Birath, E; Bird, M; Bogan, D J; Bowman, A; Bray, V J; Brozovic, M; Bryan, C; Buckley, M R; Buie, M W; Buratti, B J; Bushman, S S; Calloway, A; Carcich, B; Cheng, A F; Conard, S; Conrad, C A; Cook, J C; Cruikshank, D P; Custodio, O S; Ore, C M Dalle; Deboy, C; Dischner, Z J B; Dumont, P; Earle, A M; Elliott, H A; Ercol, J; Ernst, C M; Finley, T; Flanigan, S H; Fountain, G; Freeze, M J; Greathouse, T; Green, J L; Guo, Y; Hahn, M; Hamilton, D P; Hamilton, S A; Hanley, J; Harch, A; Hart, H M; Hersman, C B; Hill, A; Hill, M E; Hinson, D P; Holdridge, M E; Horanyi, M; Howard, A D; Howett, C J A; Jackman, C; Jacobson, R A; Jennings, D E; Kammer, J A; Kang, H K; Kaufmann, D E; Kollmann, P; Krimigis, S M; Kusnierkiewicz, D; Lauer, T R; Lee, J E; Lindstrom, K L; Linscott, I R; Lisse, C M; Lunsford, A W; Mallder, V A; Martin, N; McComas, D J; McNutt, R L; Mehoke, D; Mehoke, T; Melin, E D; Mutchler, M; Nelson, D; Nimmo, F; Nunez, J I; Ocampo, A; Owen, W M; Paetzold, M; Page, B; Parker, A H; Parker, J W; Pelletier, F; Peterson, J; Pinkine, N; Piquette, M; Porter, S B; Protopapa, S; Redfern, J; Reitsema, H J; Reuter, D C; Roberts, J H; Robbins, S J; Rogers, G; Rose, D; Runyon, K; Retherford, K D; Ryschkewitsch, M G; Schenk, P; Schindhelm, E; Sepan, B; Showalter, M R; Singer, K N; Soluri, M; Stanbridge, D; Steffl, A J; Strobel, D F; Stryk, T; Summers, M E; Szalay, J R; Tapley, M; Taylor, A; Taylor, H; Throop, H B; Tsang, C C C; Tyler, G L; Umurhan, O M; Verbiscer, A J; Versteeg, M H; Vincent, M; Webbert, R; Weidner, S; Weigle, G E; White, O L; Whittenburg, K; Williams, B G; Williams, K; Williams, S; Woods, W W; Zangari, A M; Zirnstein, E
2015-01-01
The Pluto system was recently explored by NASA's New Horizons spacecraft, making closest approach on 14 July 2015. Pluto's surface displays diverse landforms, terrain ages, albedos, colors, and composition gradients. Evidence is found for a water-ice crust, geologically young surface units, surface ice convection, wind streaks, volatile transport, and glacial flow. Pluto's atmosphere is highly extended, with trace hydrocarbons, a global haze layer, and a surface pressure near 10 microbars. Pluto's diverse surface geology and long-term activity raise fundamental questions about how small planets remain active many billions of years after formation. Pluto's large moon Charon displays tectonics and evidence for a heterogeneous crustal composition, its north pole displays puzzling dark terrain. Small satellites Hydra and Nix have higher albedos than expected.
Dahlqvist, P. [Royal Inst. of Technology, Stockholm (Sweden)
1996-08-01
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.
New black holes of vacuum Einstein equations with hyperscaling violation and Nil geometry horizons
Mokhtar Hassaine
2015-03-05
In this paper, we present a new solution of the vacuum Einstein equations in five dimensions which is a static black hole with hyperscaling violation and with a three-dimensional horizon modeled by one the eight Thurston geometries, namely the Nil geometry. This homogeneous geometry is non-trivial in the sense that it is neither of constant curvature nor a product of constant curvature manifolds. Using the Hamiltonian formalism, we identify the mass and entropy of the black hole solution. Curiously enough, in spite of the fact that the entropy turns to be negative, the mass is positive and the first law of thermodynamics holds. We also discuss the extension in higher dimension.
Naked singularities in self-similar spherical gravitational collapse
Ori, A.; Piran, T.
1987-11-09
We present general-relativistic solutions of self-similar spherical collapse of an adiabatic perfect fluid. We show that if the equation of state is soft enough (GAMMA-1<<1), a naked singularity forms. The singularity resembles the shell-focusing naked singularities that arise in dust collapse. This solution increases significantly the range of matter fields that should be ruled out in order that the cosmic-censorship hypothesis will hold.
Unambiguous discrimination of extremely similar states by a weak measurement
Chang Qiao; Shengjun Wu; Zeng-Bing Chen
2013-02-25
In this paper, we propose a method to discriminate two extremely similar quantum states via a weak measurement. For the two states with equal prior probabilities, the optimum discrimination probability given by Ivanovic-Dieks-Peres limit can be achieved by our protocol with an appropriate choice of the interaction strength. However, compared with the conventional method for state discrimination, our approach shows the advantage of error-tolerance by achieving a better ratio of the success probability to the probability of error.
Monitoring and Assessing Implications of the Deepwater Horizon Oil Spill: Potential Impacts and identifying the areas that can be affected by the oil spill. The assessments performed during this cruise.Lamkin@noaa.gov; 3053614226 1. Executive Summary. As part of NOAA's response to the Deepwater Horizon oil spill
a Sand Barrier Berm to Mitigate the Effects of the Deepwater Horizon Oil Spill on Louisiana Marshes of Building a Sand Barrier Berm to Mitigate the Effects of the Deepwater Horizon Oil Spill on LouisianaRe: Report has been approved: Effects of Building a Sand Barrier Berm to Mitigate the Effects
nh gi Tn tht Ti nguyn Thin nhin Trn du Deepwater Horizon D n phc hi C bin ti B Bin Quc Gia
Horizon. Sau s c tràn du Deepwater Horizon, mt lng áng k du t n bãi bin dc theo Florida Panhandle. Trong vi C rùa( Thallasiumtestudium ) , loài ph bin nht ti thm c bin GUIS 3 ) t các im quan trc o lng và
Meyers, Steven D.
better or worse than the others throughout the event with one excep- tion. The lessons learned fromTrajectory Forecast as a Rapid Response to the Deepwater Horizon Oil Spill Yonggang Liu, Robert H. Petersburg, Florida, USA In response to the Gulf of Mexico Deepwater Horizon oil spill, a Lagrangian
Will new horizons see dust clumps in the Edgeworth-Kuiper Belt?
Vitense, Christian; Krivov, Alexander V.; Löhne, Torsten
2014-06-01
Debris disks are thought to be sculptured by neighboring planets. The same is true for the Edgeworth-Kuiper debris disk, yet no direct observational evidence for signatures of giant planets in the Kuiper Belt dust distribution has been found so far. Here we model the dust distribution in the outer solar system to reproduce the dust impact rates onto the dust detector on board the New Horizons spacecraft measured so far and to predict the rates during the Neptune orbit traverse. To this end, we take a realistic distribution of trans-Neptunian objects to launch a sufficient number of dust grains of different sizes and follow their orbits by including radiation pressure, Poynting-Robertson and stellar wind drag, as well as the perturbations of four giant planets. In a subsequent statistical analysis, we calculate number densities and lifetimes of the dust grains in order to simulate a collisional cascade. In contrast to the previous work, our model not only considers collisional elimination of particles but also includes production of finer debris. We find that particles captured in the 3:2 resonance with Neptune build clumps that are not removed by collisions, because the depleting effect of collisions is counteracted by production of smaller fragments. Our model successfully reproduces the dust impact rates measured by New Horizons out to ?23 AU and predicts an increase of the impact rate of about a factor of two or three around the Neptune orbit crossing. This result is robust with respect to the variation of the vaguely known number of dust-producing scattered disk objects, collisional outcomes, and the dust properties.
Grosell, Martin
Acute Embryonic or Juvenile Exposure to Deepwater Horizon Crude Oil Impairs the Swimming and ecologically important fish species to crude oil during the sensitive early life stages. We show that brief approximately 4 million barrels (6 × 108 L) of crude oil into the northern Gulf of Mexico (GoM).1-3 The DWH
Kusiak, Andrew
of Wind Power: A Data-Driven Approach Andrew Kusiak, Member, IEEE, and Zijun Zhang Abstract--This paper discusses short-horizon prediction of wind speed and power using wind turbine data collected at 10 s inter and data-driven models are developed for wind prediction. Power prediction models are estab- lished, which
Clement, Prabhakar
Clement Environmental Engineering Program, Department of Civil Engineering, Auburn University, AL 36849 The 2010 Deepwater Horizon (DWH) catastrophe had considerable impact on the 50 km long sandy beach sys- tem over the open ocean system in the Gulf of Mexico. Light PAHs, such as naphthalenes, were fully depleted
Clement, Prabhakar
: Available online 10 December 2014 Keywords: Oil spill Deepwater Horizon spill Beach contamination Polycyclic aromatic hydrocarbons Crude oil spill a b s t r a c t The impact of MC252 oil on northern Gulf of Mexico impacting these beaches was predominantly in the form of water- in-oil (W/O) emulsions, a highly viscous
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 turbine control system, and shows reductions in both extreme loads and power fluctuations by 80% and 90
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
nh Gi Thit Hi Ti Nguyn Thin Nhin ca V Trn Du Deepwater Horizon Cc D n Qun Franklin
công cng hin nay. Ban Qun Tr ánh Giá Thit Hi Tài Nguyên The Deepwater Horizon xut by d án v gii trí ti/hoc tng cng s dng và/hoc thng ngon ca công chúng i vi các ngun li thiên nhiên này. xut Nâng Cp Các Công
Planckian corrections to the Friedmann flat equations from thermodynamics at the apparent horizon
Viaggiu, Stefano
2015-01-01
In this paper we use our recently generalized black hole entropy formula to propose a quantum version of the Friedmann equations. In particular, starting from the differential version of the first law of thermodynamics, we are able to find planckian (non commutative) corrections to the Friedmann flat equations. The so modified equations are formally similar to the ones present in Gauss-Bonnet gravity, but in the ordinary 3+1 dimensions. As a consequence of these corrections, by considering negative fluctuations in the internal energy that are allowed by quantum field theory, our equations imply a maximum value both for the energy density $\\rho$ and for the Hubble flow $H$, i.e. the big bang is ruled out. Conversely, by considering positive quantum fluctuations, we found no maximum for $\\rho$ and $H$. Nevertheless, by starting with an early time energy density $\\rho\\sim 1/t^2$, we obtain a value for the scale factor $a(t)\\sim e^{\\sqrt{t}}$, implying a finite planckian universe at $t=0$, i.e. the point-like big...
Hart, Gus
1. With the sun at the horizon, light goes through more atmosphere to reach us, scattering more the line between you and the sun. I accepted any position along this arc: i.e. N or S at the horizon
On the similarity of Information Energy to Dark Energy
M. P. Gough; T. D. Carozzi; A. M. Buckley
2006-06-19
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.
Sentence based semantic similarity measure for blog-posts
Aziz, Mehwish
2012-01-01
Blogs-Online digital diary like application on web 2.0 has opened new and easy way to voice opinion, thoughts, and like-dislike of every Internet user to the World. Blogosphere has no doubt the largest user-generated content repository full of knowledge. The potential of this knowledge is still to be explored. Knowledge discovery from this new genre is quite difficult and challenging as it is totally different from other popular genre of web-applications like World Wide Web (WWW). Blog-posts unlike web documents are small in size, thus lack in context and contain relaxed grammatical structures. Hence, standard text similarity measure fails to provide good results. In this paper, specialized requirements for comparing a pair of blog-posts is thoroughly investigated. Based on this we proposed a novel algorithm for sentence oriented semantic similarity measure of a pair of blog-posts. We applied this algorithm on a subset of political blogosphere of Pakistan, to cluster the blogs on different issues of political...
Vere-Jones' self-similar branching model
Saichev, A. [Mathematical Department, Nizhny Novgorod State University, Gagarin prosp. 23, Nizhny Novgorod, 603950 (Russian Federation); Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095 (United States); Sornette, D. [Institute of Geophysics and Planetary Physics and Department of Earth and Space Sciences, University of California, Los Angeles, California 90095 (United States); Laboratoire de Physique de la Matiere Condensee, CNRS UMR 6622 and Universitee de Nice-Sophia Antipolis, 06108 Nice Cedex 2 (France)
2005-11-01
Motivated by its potential application to earthquake statistics as well as for its intrinsic interest in the theory of branching processes, we study the exactly self-similar branching process introduced recently by Vere-Jones. This model extends the ETAS class of conditional self-excited branching point-processes of triggered seismicity by removing the problematic need for a minimum (as well as maximum) earthquake size. To make the theory convergent without the need for the usual ultraviolet and infrared cutoffs, the distribution of magnitudes m{sup '} of daughters of first-generation of a mother of magnitude m has two branches m{sup '}
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)
2013-07-15
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.
The effects of similarity breaking on the intracluster medium
E. J. Lloyd-Davies; R. G. Bower; T. J. Ponman
2002-03-28
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.
OBSERVATIONS OF ISOTROPIC INTERSTELLAR PICK-UP IONS AT 11 AND 17 AU FROM NEW HORIZONS
Randol, B. M.; McComas, D. J.; Elliott, H. A.; Gosling, J. T.; Schwadron, N. A.
2012-08-10
We report new observations by the Solar Wind Around Pluto (SWAP) instrument on the New Horizons spacecraft of an energy-per-charge (E/q) spectrum of interstellar pick-up ions (PUIs) from an unprecedented heliocentric distance of 17 AU. This E/q spectrum is fit well by an isotropic PUI distribution function combined with the detailed response of the SWAP instrument. In contrast to earlier work, we are also able to fit an isotropic PUI model to an E/q spectrum measured by SWAP at 11.3 AU by explicitly including two additional effects. These are (1) the E/q-dependent geometric factor of SWAP, which increases with decreasing E/q owing to effects associated with the post-acceleration of particles exiting the electrostatic analyzer portion of the instrument; and (2) a solar wind distribution, the model spectrum of which contributes significantly to the low-E/q part of the overall model owing, presumably, to secondary particles produced within the instrument.
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.
2013-05-24
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.
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)
2013-06-10
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.
2013-05-24
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)more »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.« less
Kagan, Grigory; Rinderknecht, H G; Rosenberg, M J; Zylstra, A B; Huang, C -K
2015-01-01
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.
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)
2010-08-15
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.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Kagan, Grigory; Svyatskiy, D.; Rinderknecht, H. G.; Rosenberg, M. J.; Zylstra, A. B.; Huang, C. -K.; McDevitt, C. J.
2015-09-03
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 hydrodynamic instabilities and kinetic effects is for the first time assessed quantitatively to find that the instabilities substantially aggravate the fusion reactivity reduction. Thus, 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 atmore »the National Ignition Facility.« less
Stress-energy tensor in colliding plane wave space-times: An approximation procedure
Miquel Dorca
1997-11-07
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.
A classification of spherically symmetric self-similar dust models
B. J. Carr
2000-03-02
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.
Haberl, J. S.; Athar, A.; Claridge, D. E.
1998-01-01
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
2013-01-01
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
3D simulations of wet foam coarsening evidence a self similar growth regime
Gilberto L. Thomas; Julio M. Belmonte; François Graner; James A. Glazier; Rita M. C. de Almeida
2015-02-11
In wet liquid foams, slow diffusion of gas through bubble walls changes bubble pressure, volume and wall curvature. Large bubbles grow at the expenses of smaller ones. The smaller the bubble, the faster it shrinks. As the number of bubbles in a given volume decreases in time, the average bubble size increases: i.e. the foam coarsens. During coarsening, bubbles also move relative to each other, changing bubble topology and shape, while liquid moves within the regions separating the bubbles. Analyzing the combined effects of these mechanisms requires examining a volume with enough bubbles to provide appropriate statistics throughout coarsening. Using a Cellular Potts model, we simulate these mechanisms during the evolution of three-dimensional foams with wetnesses of $\\phi=0.00$, $0.05$ and $ 0.20$. We represent the liquid phase as an ensemble of many small fluid particles, which allows us to monitor liquid flow in the region between bubbles. The simulations begin with $2 \\times 10^5$ bubbles for $\\phi = 0.00$ and $1.25 \\times 10^5$ bubbles for $\\phi = 0.05$ and $0.20$, allowing us to track the distribution functions for bubble size, topology and growth rate over two and a half decades of volume change. All simulations eventually reach a self-similar growth regime, with the distribution functions time independent and the number of bubbles decreasing with time as a power law whose exponent depends on the wetness.
Mandel, Ilya
2005-10-15
The most promising way to compute the gravitational waves emitted by binary black holes (BBHs) in their last dozen orbits, where post-Newtonian techniques fail, is a quasistationary approximation introduced by Detweiler and being pursued by Price and others. In this approximation the outgoing gravitational waves at infinity and downgoing gravitational waves at the holes' horizons are replaced by standing waves so as to guarantee that the spacetime has a helical Killing vector field. Because the horizon generators will not, in general, be tidally locked to the holes' orbital motion, the standing waves will destroy the horizons, converting the black holes into naked singularities that resemble black holes down to near the horizon radius. This paper uses a spherically symmetric, scalar-field model problem to explore in detail the following BBH issues: (i) The destruction of a horizon by the standing waves. (ii) The accuracy with which the resulting naked singularity resembles a black hole. (iii) The conversion of the standing-wave spacetime (with a destroyed horizon) into a spacetime with downgoing waves by the addition of a 'radiation-reaction field'. (iv) The accuracy with which the resulting downgoing waves agree with the downgoing waves of a true black-hole spacetime (with horizon). The model problem used to study these issues consists of a Schwarzschild black hole endowed with spherical standing waves of a scalar field, whose wave frequency and near-horizon energy density are chosen to match those of the standing gravitational waves of the BBH quasistationary approximation. It is found that the spacetime metric of the singular, standing-wave spacetime, and its radiation-reaction-field-constructed downgoing waves are quite close to those for a Schwarzschild black hole with downgoing waves--sufficiently close to make the BBH quasistationary approximation look promising for non-tidally-locked black holes.
Solubility of aluminum and silica in Spodic horizons as affected by drying and freezing
Simonsson, M.; Berggren, D.; Gustafsson, J.P.
1999-10-01
The release of toxic Al{sup 3+} is one of the most serious consequences of anthropogenic soil acidification. Therefore, the mechanisms controlling Al solubility have been a topic of intense research for more than a decade. For convenience, soil samples are often dried before storage and experimental use. However, the literature offers examples of drying that results in changes in pH, solubility of organic matter, and dissolution rates of Al. In this study, the authors examined the solubility of Al and Si in fresh soil and in soil that had been dried or deep-frozen. Five Spodosol B horizon soils were subjected to batch titrations, where portions of each soil were equilibrated with solutions with varying concentrations of acid or base added. Extractions with acid oxalate and Na pyrophosphate indicated the presence of imogolite-type materials (ITM) in three of the soils. In the other two soils most secondary solid-phase Al was associated with humic substances. Deep-freezing did not significantly change pH nor the concentration of Al or Si as compared with fresh soil. Drying, on the other hand, yielded pH increases of up to 0.3 units at a given addition of acid or base, whereas Al{sup 3+} changed only slightly, implying a higher Al solubility in all of the soils. Furthermore, dissolved silica increased by up to 200% after drying, except in a soil that almost completely lacked oxalate-extractable Si. The authors suggest that drying enhanced the dissolution of ITM by disrupting soil organic matter, thus exposing formerly coated mineral surfaces. In the soil where dissolved Si did not change with drying, it has been demonstrated that Al-humus complexes controlled Al solubility. They suggest that fissures in the organic material caused by drying may have exposed formerly occluded binding sites that had a higher Al saturation than had sites at the surface of humus particles.
Basset, Yves
change. Similar (and statistically indistinguishable: x2 ¼ 1:99; df ¼ 2; P ¼ 0:57) proportions by respondents who had a smaller proportion of papers accepted without rejection (x2 ¼ 19:12; df ¼ 1; P , 0:001), and a greater proportion of papers submitted multiple times before publication (x2 ¼ 22:83; df ¼ 1; P , 0
Todorov, Alex
When physical similarity matters: Mechanisms underlying affective learning generalization instructions to disregard physical similarity Learning generalization is a powerful and relatively automatic). The findings of the experiments suggest that learning generalization based on facial physical similarity
Integrated method for chaotic time series analysis
Hively, L.M.; Ng, E.G.
1998-09-29
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)
1998-01-01
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.
SYMBOLS FOR TIME = time variable
Duchowski, Andrew T.
=forever) Cost spent to build variation point i at time i = index over variation points #12;SYMBOLS FOR TIME to account for net present value of money r = assumed interest rate i = index over variation points Cost Expected cost summed over all relevant time intervals Cost spent to build variation point i at time r
A. H. M. Kierkels; J. J. L. Velázquez
2015-11-04
We construct a family of self-similar solutions with fat tails to a quadratic kinetic equation. This equation describes the long time behaviour of weak solutions with finite mass to the weak turbulence equation associated to the nonlinear Schr\\"odinger equation. The solutions that we construct have finite mass, but infinite energy. In J. Stat. Phys. 159:668-712, self-similar solutions with finite mass and energy were constructed. Here we prove upper and lower exponential bounds on the tails of these solutions.
Burra G. Sidharth
2008-09-03
We briefly review two concepts of time - the usual time associated with "being" and more recent ideas, answering to the description of "becoming". The approximation involved in the former is examined. Finally we argue that it is (unpredictable) fluctuations that underlie time.
Space-time inhomogeneity, anisotropy and gravitational collapse
R. Sharma; R. Tikekar
2012-06-24
We investigate the evolution of non-adiabatic collapse of a shear-free spherically symmetric stellar configuration with anisotropic stresses accompanied with radial heat flux. The collapse begins from a curvature singularity with infinite mass and size on an inhomogeneous space-time background. The collapse is found to proceed without formation of an even horizon to singularity when the collapsing configuration radiates all its mass energy. The impact of inhomogeneity on various parameters of the collapsing stellar configuration is examined in some specific space-time backgrounds.
TransPlanckian Particles and the Quantization of Time
G. 't Hooft
1998-05-20
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.
J. H. McGuire; L. Kaplan; Kh. Kh. Shakov; A. Chalastaras; A. M. Smith; A. Godunov; H. Schmidt-Böcking; D. Uskov
2005-12-29
Time ordering may be defined by first defining the limit of no time ordering (NTO) in terms of a time average of an external interaction, V(t). Previously, time correlation was defined in terms of a similar limit called the independent time approximation (ITA). Experimental evidence for time correlation has not yet been distinguished from experimental evidence for time ordering.
John Ashmead
2010-05-05
Normally we quantize along the space dimensions but treat time classically. But from relativity we expect a high level of symmetry between time and space. What happens if we quantize time using the same rules we use to quantize space? To do this, we generalize the paths in the Feynman path integral to include paths that vary in time as well as in space. We use Morlet wavelet decomposition to ensure convergence and normalization of the path integrals. We derive the Schr\\"odinger equation in four dimensions from the short time limit of the path integral expression. We verify that we recover standard quantum theory in the non-relativistic, semi-classical, and long time limits. Quantum time is an experiment factory: most foundational experiments in quantum mechanics can be modified in a way that makes them tests of quantum time. We look at single and double slits in time, scattering by time-varying electric and magnetic fields, and the Aharonov-Bohm effect in time.
Nairwita Mazumder; Subenoy Chakraborty
2010-05-28
In this paper, we investigate the validity of the generalized second law of thermodynamics of the universe bounded by the event horizon. Here we consider homogeneous and isotropic model of the universe filled with perfect fluid in one case and in another case holographic model of the universe has been considered. In the third case the matter in the universe is taken in the form of non-interacting two fluid system as holographic dark energy and dust. Here we study the above cases in the Modified gravity, f(R) gravity.
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
The Similarity of Global Value Chains: A Network-Based Measure
Zhu, Zhen; Puliga, Michelangelo; Chessa, Alessandro; Riccaboni, Massimo
2015-01-01
International trade has been increasingly organized in the form of global value chains (GVCs) where different stages of production are located in different countries. This recent phenomenon has substantial consequences for both trade policy design at the national or regional level and business decision making at the firm level. In this paper, we provide a new method for comparing GVCs across countries and over time. First, we use the World Input-Output Database (WIOD) to construct both the upstream and downstream global value networks, where the nodes are individual sectors in different countries and the links are the value-added contribution relationships. Second, we introduce a network-based measure of node similarity to compare the GVCs between any pair of countries for each sector and each year available in the WIOD. Our network-based similarity is a better measure for node comparison than the existing ones because it takes into account all the direct and indirect relationships between country-sector pair...
Self similar solution of superradiant amplification of ultrashort laser pulses in plasma
Moghadasin, H.; Niknam, A. R. Shokri, B.
2015-05-15
Based on the self-similar method, superradiant amplification of ultrashort laser pulses by the counterpropagating pump in a plasma is investigated. Here, we present a governing system of partial differential equations for the signal pulse and the motion of the electrons. These equations are transformed to ordinary differential equations by the self-similar method and numerically solved. It is found that the increase of the signal intensity is proportional to the square of the propagation distance and the signal frequency has a red shift. Also, depending on the pulse width, the signal breaks up into a train of short pulses or its duration decreases with the inverse square root of the distance. Moreover, we identified two distinct categories of the electrons by the phase space analysis. In the beginning, one of them is trapped in the ponderomotive potential well and oscillates while the other is untrapped. Over time, electrons of the second kind also join to the trapped electrons. In the potential well, the electrons are bunched to form an electron density grating which reflects the pump pulse into the signal pulse. It is shown that the backscattered intensity is enhanced with the increase of the electron bunching parameter which leads to the enhanced efficiency of superradiant amplification.
Claudio Coriano; Luigi Delle Rose; Matteo Maria Maglio; Mirko Serino
2015-01-16
We investigate the semiclassical approach to the lensing of photons in a spherically symmetric gravitational background, starting from Born level and include in our analysis the radiative corrections obtained from the electroweak theory for the graviton/photon/photon vertex. In this approach, the cross section is related to the angular variation of the impact parameter ($b$), which is then solved for $b$ as a function of the angle of deflection, and measured in horizon units ($b_h\\equiv b/(2 G M)$). Exact numerical solutions for the angular deflection are presented. The numerical analysis shows that perturbation theory in a weak background agrees with the classical Einstein formula for the deflection already at distances of the order of $20$ horizon units ($\\sim 20\\, b_h$) and it is optimal in the description both of very strong and weak lensings. We show that the electroweak corrections to the cross section are sizeable, becoming very significant for high energy gamma rays. Our analysis covers in energy most of the photon spectrum, from the cosmic microwave background up to very high energy gamma rays, and scatterings with any value of the photon impact parameter. We also study the helicity-flip photon amplitude, which is of $O(\\alpha^2)$ in the weak coupling $\\alpha$, and its massless fermion limit, which involves the exchange of a conformal anomaly pole. The corresponding cross section is proportional to the Born level result and brings to a simple renormalization of Einsten's formula.
Forecasting of preprocessed daily solar radiation time series using neural networks
Paoli, Christophe; Muselli, Marc; Nivet, Marie-Laure [University of Corsica, CNRS UMR SPE, Corte (France); Voyant, Cyril [University of Corsica, CNRS UMR SPE, Corte (France); Hospital of Castelluccio, Radiotherapy Unit, Ajaccio (France)
2010-12-15
In this paper, we present an application of Artificial Neural Networks (ANNs) in the renewable energy domain. We particularly look at the Multi-Layer Perceptron (MLP) network which has been the most used of ANNs architectures both in the renewable energy domain and in the time series forecasting. We have used a MLP and an ad hoc time series pre-processing to develop a methodology for the daily prediction of global solar radiation on a horizontal surface. First results are promising with nRMSE {proportional_to} 21% and RMSE {proportional_to} 3.59 MJ/m{sup 2}. The optimized MLP presents predictions similar to or even better than conventional and reference methods such as ARIMA techniques, Bayesian inference, Markov chains and k-Nearest-Neighbors. Moreover we found that the data pre-processing approach proposed can reduce significantly forecasting errors of about 6% compared to conventional prediction methods such as Markov chains or Bayesian inference. The simulator proposed has been obtained using 19 years of available data from the meteorological station of Ajaccio (Corsica Island, France, 41 55'N, 8 44'E, 4 m above mean sea level). The predicted whole methodology has been validated on a 1.175 kWc mono-Si PV power grid. Six prediction methods (ANN, clear sky model, combination..) allow to predict the best daily DC PV power production at horizon d + 1. The cumulated DC PV energy on a 6-months period shows a great agreement between simulated and measured data (R{sup 2} > 0.99 and nRMSE < 2%). (author)
G. 't Hooft
2005-04-25
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.
Garcia, Maria Fernanda
2005-11-01
In this dissertation I will present and test a model linking actual applicant-interviewer demographic, human capital, and cultural capital similarity to an interviewer??s recommendation to hire. Actual similarity is ...
Unknown
2011-09-05
-1 THE PREDICTION OF BUS ARRIVAL TIME USING AUTOMATIC VEHICLE LOCATION SYSTEMS DATA A Dissertation by RAN HEE JEONG Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of DOCTOR OF PHILOSOPHY December 2004 Major Subject: Civil Engineering THE PREDICTION OF BUS ARRIVAL TIME USING AUTOMATIC VEHICLE LOCATION SYSTEMS DATA A Dissertation by RAN HEE JEONG Submitted to Texas A...
Dries Sels; Michiel Wouters
2015-01-22
The problem of time is a deep paradox in our physical description of the world. According to Aristotle's relational theory, time is a measure of change and does not exist on its own. In contrast, quantum mechanics, just like Newtonian mechanics, is equipped with a master clock that dictates the evolution of a system. This clock is infinitely precise and tacitly supplied free of charge from outside physics. Not only does this absolute time make it notoriously difficult to make a consistent theory of quantum gravity, it is also the underlying problem in establishing the second law. Indeed, contrary to our experience, the Wheeler-deWitt equation --a canonical quantization of general relativity-- predicts a static universe. Similarly, when simply concerned with the dynamics of a closed quantum system, there is no second law because the Von Neumann entropy is invariant under unitary transformations. Here we are mainly concerned with the latter problem and we show that it can be resolved by attributing a minimal amount of resources to the measurement of time. Although there is an absolute time in quantum mechanics, an observer can only establish a time by measuring a clock. For a local measurement, the minimal entropy production is equal to the number of ticks. This lower bound is attained by a black hole.
C.J. Miller; T.S. Yoder
2010-06-01
The amount of time that an explosive is present on the surface of a material is dependent upon the original amount of explosive on the surface, temperature, humidity, rain, etc. This laboratory study focused on looking at similarities and differences in three different surface contamination techniques that are used when performance testing explosive trace detection equipment in an attempt to determine how effective the techniques are at replicating actual field samples. The three techniques used were dry transfer deposition of solutions using the Transportation Security Laboratory (TSL) patented dry transfer techniques (US patent 6470730), direct deposition of explosive standards, and fingerprinting of actual explosives. Explosives were deposited on the surface of one of five substrates using one of the three different deposition techniques. The process was repeated for each surface type using each contamination technique. The surface types used were: 50% cotton/50% polyester as found in T-shirts, 100% cotton with a smooth surface such as that found in a cotton dress shirt, 100% cotton on a rough surface such as that found on canvas or denim, suede leather such as might be found on jackets, purses, or shoes, and metal obtained from a car hood at a junk yard. The samples were not pre-cleaned prior to testing and contained sizing agents, and in the case of the metal, oil and dirt. The substrates were photographed using a Zeiss Discover V12 stereoscope with Axiocam ICc1 3 megapixel digital camera to determine the difference in the crystalline structure and surface contamination in an attempt to determine differences and similarities associated with current contamination techniques.
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
2013-01-01
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.
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
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
nh Gi Tn Hi Ti Nguyn Thin Nhin do Trn Du Deep Horizon D n nng cp ng mn vo Khu
tht v dch v gii trí trong vùng t thuc B ni V nm bang vùng Vnh. Sau s c tràn du Deep Horizon, mt lng du và các hot ng i phó u ã làm tn tht các c hi gii trí và làm gim cht lng tri nghim ca du khách n khu
de Weck, Olivier L.
in this issuewe offer commentary on the Iran nuclear negotiations and a Q&A about the New Horizons/October 2015 http://web.mit.edu/fnl Massachusetts Institute of Technology continued on page 8 Iran and the P5.S., China, Russia, France,UK,and Germany) and Iran,with respect to non-proliferation of nuclear weapons
Paris-Sud XI, Université de
properties of the individual components (as wind or solar energy equipment, on-site storage etc.), which may, as well as distributed energy-storage systems (Chen, duan, Cai, Liu, & Hu 2011), (Katiraei & Iravani 20062919 Safety, Reliability and Risk Analysis: Beyond the Horizon Steenbergen et al. (Eds) © 2014
Rathbun, Julie A.
Lunar Science Problems ..........................1 Outlook for Lunar Sample Studies ...........................................30 4 OUTLOOK FOR CURATORIALOPERATIONS ...................31 #12;#12;INTRODUCTION The Moon knowledge about the solar system. Further, the treasures returned through the Apolloprogram provide
Massively Multi-core Acceleration of a Document-Similarity Classifier to Detect Web Attacks
Ulmer, C; Gokhale, M; Top, P; Gallagher, B; Eliassi-Rad, T
2010-01-14
This paper describes our approach to adapting a text document similarity classifier based on the Term Frequency Inverse Document Frequency (TFIDF) metric to two massively multi-core hardware platforms. The TFIDF classifier is used to detect web attacks in HTTP data. In our parallel hardware approaches, we design streaming, real time classifiers by simplifying the sequential algorithm and manipulating the classifier's model to allow decision information to be represented compactly. Parallel implementations on the Tilera 64-core System on Chip and the Xilinx Virtex 5-LX FPGA are presented. For the Tilera, we employ a reduced state machine to recognize dictionary terms without requiring explicit tokenization, and achieve throughput of 37MB/s at slightly reduced accuracy. For the FPGA, we have developed a set of software tools to help automate the process of converting training data to synthesizable hardware and to provide a means of trading off between accuracy and resource utilization. The Xilinx Virtex 5-LX implementation requires 0.2% of the memory used by the original algorithm. At 166MB/s (80X the software) the hardware implementation is able to achieve Gigabit network throughput at the same accuracy as the original algorithm.
Gravitational collapse and non-self similarity in the L-T relation
A. Del Popolo
2006-09-06
We derive the luminosity-temperature relation for clusters of galaxies by means of a modification of the self-similar model to take account of angular momentum acquisition by protostructures and of an external pressure term in the virial theorem. The fundamental result of the model is that gravitational collapse, which takes account of angular momentum acquisition, can explain the non self-similarity in the L-T relation, in disagreement with the largely accepted assumption that heating/cooling processes and similar are fundamental in the originating the non-self similar behavior (shaping) of the L-T relation.
Davis, Trisha N.
Biochemistry 1993, 32, 3261-3270 3261 Similarities and Differences between Yeast and Vertebrate of Biochemistry, Universityof Washington,Seattle, Washington 98195 Received July 28, 1992;Revised Manuscript
Long distance symmetries for nuclear forces and the similarity renormalization group
Szpigel, S.; Timoteo, V. S.; Arriola, E. R.
2013-03-25
In this work we study the emergence of long distance symmetries for nuclear forces within the framework of the similarity renormalization group approach.
TIMELY DELIVERY OF LASER INERTIAL FUSION ENERGY (LIFE)
Dunne, A M
2010-11-30
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.
Time symmetry in wave function collapse models
Daniel Bedingham
2015-02-25
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.
A connection between plasma conditions near black hole event horizons and outflow properties
Koljonen, K I I; Ontiveros, J A Fernández; Markoff, S; Russell, T D; Miller-Jones, J C A; van der Horst, A J; Bernardini, F; Casella, P; Curran, P A; Gandhi, P; Soria, R
2015-01-01
Accreting black holes are responsible for producing the fastest, most powerful outflows of matter in the Universe. The formation process of powerful jets close to black holes is poorly understood, and the conditions leading to jet formation are currently hotly debated. In this paper, we report an unambiguous empirical correlation between the properties of the plasma close to the black hole and the particle acceleration properties within jets launched from the central regions of accreting stellar-mass and supermassive black holes. In these sources the emission of the plasma near the black hole is characterized by a power law at X-ray energies during times when the jets are produced. We find that the photon index of this power law, which gives information on the underlying particle distribution, correlates with the characteristic break frequency in the jet spectrum, which is dependent on magnetohydrodynamical processes in the outflow. The observed range in break frequencies varies by five orders of magnitude, i...
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
Self-similarity properties of nafionized and filtered water and deformed coherent states
Capolupo, A; Elia, V; Germano, R; Napoli, E; Niccoli, M; Tedeschi, A; Vitiello, G
2013-01-01
By resorting to measurements of physically characterizing observables of water samples perturbed by the presence of Nafion and by iterative filtration processes, we discuss their scale free, self-similar fractal properties. By use of algebraic methods the isomorphism is proved between such self-similarity features and the deformed coherent state formalism.
Self-similarity properties of nafionized and filtered water and deformed coherent states
A. Capolupo; E. Del Giudice; V. Elia; R. Germano; E. Napoli; M. Niccoli; A. Tedeschi; G. Vitiello
2013-12-26
By resorting to measurements of physically characterizing observables of water samples perturbed by the presence of Nafion and by iterative filtration processes, we discuss their scale free, self-similar fractal properties. By use of algebraic methods the isomorphism is proved between such self-similarity features and the deformed coherent state formalism.
A Framework for Semantic-based Similarity Measures for ELH-Concepts
Baader, Franz
Research Foundation (DFG) in the Collaborative Research Center 912 "Highly Adaptive Energy-Efficient for similarity measures for ELH-concepts. If instan- tiated with the right functions and operators as building the resulting measure should have and to build their measure accordingly. Furthermore, the resulting similarity
Distributional Similarity of Multi-Word Expressions Laura Ingram and James R. Curran
Curran, James R.
Distributional Similarity of Multi-Word Expressions Laura Ingram and James R. Curran School, 1994) to include multi-word terms and syntactic contexts. Curran (2004) experiments with different) and Curran (2004) evaluate many measures for calculating distributional similarity. We follow (Curran, 2004
Distributional Similarity of Multi-Word Expressions Laura Ingram and James R. Curran
Distributional Similarity of Multi-Word Expressions Laura Ingram and James R. Curran School, 1994) to include multi-word terms and syntactic contexts. Curran (2004) experiments with different for distributional similarity. Weeds (2003) and Curran (2004) evaluate measures for calculating dis- tributional
Exploiting Media Stream Similarity for Energy-Efficient Decoding and Resource Prediction
Eeckhout, Lieven
2 Exploiting Media Stream Similarity for Energy-Efficient Decoding and Resource Prediction JUAN evaluation, done using the H.264 AVC decoder and 12 reference video streams, shows an average energy, Video stream similarity, Scenario-based design, Energy- efficiency, Resource prediction ACM Reference
High-Dimensional Similarity Searches Using A Metric Pseudo-Grid Christian Digout Mario A. Nascimento
Nascimento, Mario A.
High-Dimensional Similarity Searches Using A Metric Pseudo-Grid Christian Digout Mario A the proposal of numerous tree-based access structures for high dimensional similarity searches, tech- niques in the met- ric space, each one determining a number of hyper-rings in this space. The intersection of those
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
Gordeyev, Stanislav
Similarities and Differences in Aero-Optical Structure over Cylindrical and Hemispherical Turrets, Missouri, USA This paper discusses similarities and differences for aft-looking angles of the aero- optical turret. Both fluid-mechanic and aero-optical data for the base- line flows over the turrets and with two
Self-similar evolution of a precipitate in inhomogeneous elastic media Amlan Barua a
Li, Xiaofan
and nonlinear simulations to study the self-similar growth and shrinkage of a precipitate in a 2D elastic media at which compact self-similar growth/shrinkage occurs in the linear regime. We then develop a spectrally on the understanding and characterization of complex patterns such as dendrites. In many applications (e.g. castings
Similarities of multiple fracturing on a neutron star and on the Earth
Kossobokov, Vladimir G. [International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, 79-2 Warshavskoe Shosse, Moscow, Russia (Russian Federation)] [International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, 79-2 Warshavskoe Shosse, Moscow, Russia (Russian Federation); Keilis-Borok, Vladimir I. [International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, 79-2 Warshavskoe Shosse, Moscow, Russia (Russian Federation)] [International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, 79-2 Warshavskoe Shosse, Moscow, Russia (Russian Federation); Cheng, Baolian [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2000-04-01
In this paper the similarities of multiple fracturing on a neutron star and on the Earth are explored, including power-law energy distributions, clustering, and the symptoms of transition to a major rupture. These similarities may reflect a scenario of a critical transition, common for a broader class of nonlinear systems. (c) 2000 The American Physical Society.
The Arrow of Time Forbids a Positive Cosmological Constant $?$
Laura Mersini-Houghton
2007-04-20
Motivated by the mounting evidence for dark energy, here we explore the consequences of a fundamental cosmological constant $\\Lambda$ for our universe. We show that when the gravitational entropy of a pure DeSitter state ultimately wins over matter, then the thermodynamic arrow of time in our universe must reverse in scales of order a Hubble time. We find that due to the dynamics of gravity and nonlocal entanglement, a finite size system such as a DeSitter patch with horizon size $H_0^{-1}$ has a finite lifetime $\\Delta t$. This phenomenon arises from the dynamic gravitational instabilities that develop during a DeSitter epoch and turn catastrophic. A reversed arrow of time is clearly in disagreement with observations. Thus we are led to conclude: Nature forbids a fundamental $\\Lambda$. Or else general relativity must be modified in the IR regime when $\\Lambda$ dominates the expansion of the Universe.
Dispatch R427 Time perception: Brain time or event time?
Johnston, Alan
Dispatch R427 Time perception: Brain time or event time? Alan Johnston* and Shin'ya Nishida Recent experiments show that synchronous events can appear to an observer to occur at different times. Neural processing time delays are offered as an explanation of these temporal illusions, but equating perceived time
If you are a History Major with an overall GPA of at least 3.2, a similar GPA in your history
Fernandez, Eduardo
If you are a History Major with an overall GPA of at least 3.2, a similar GPA in your history into the honors track in history. The new honors track offers special challenges and exciting possibilities in History" will be placed on your transcript at the time of graduation. If you do not meet the GPA criteria
Time Management Managing Time and Tasks
Kunkle, Tom
Time Management Managing Time and Tasks What is time management? Time can't be managed Â but you can manage the amount of time you use each day for fun, work, rest, and time spent with others. Why is time management important? You have responsibilities to yourself, to your family and friends, to your
O. Blanch; M. Martinez
2004-06-02
The potential of the new generation Cherenkov Telescopes to measure the energy spectrum of both, the already established extragalactic very high energy gamma-ray emitters and the best very high energy candidates from the EGRET catalogue is discussed. By a realistic simulation of the analysis of the expected extrapolated energy spectra, it is shown that the foreseen capability and precision of these instrument to measure the Gamma Ray Horizon may open the door to competitive measurements of the cosmological parameters.
nh gi Tn hi Ti nguyn Thin nhin do Trn du Deep Horizon Khi phc loi chim ng bin ti vng b bin Alabama
ánh giá Tn hi Tài nguyên Thiên nhiên do Tràn du Deep Horizon Khôi phc loài chim ng bin ti vùng b Alabama s hình thành 5 nn làm t ca chim ng dc theo vùng b bin Mobile và Baldwin, Alabama tng c hi làm có th c tìm thy quanh nm ti khu vc b bin Alabama. Chim ng bin òi hi nhng khu vc làm t rng rãi vi
Nairwita Mazumder; Subenoy Chakraborty
2010-05-19
In this letter, we investigate the validity of the generalized second law of thermodynamics of the universe bounded by the event horizon in the holographic dark energy model. The universe is chosen to be homogeneous and isotropic and the validity of the first law has been assumed here. The matter in the universe is taken in the form of non-interacting two fluid system- one component is the holographic dark energy model and the other component is in the form of dust.
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
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
Influence of heterogeneity on second-kind self-similar solutions...
Office of Scientific and Technical Information (OSTI)
Influence of heterogeneity on second-kind self-similar solutions for viscous gravity currents Citation Details In-Document Search Title: Influence of heterogeneity on second-kind...
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;
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
Noble, Julia Natasha
2008-06-23
the existence of chimpanzee friendship, by considering whether there are similar mechanisms to those which have been implicated in the formation of human friendships, kinship and the residual effects of two kin recognition mechanisms; familiarity and phenotype...
Benli, Mustafa G
2013-07-22
This dissertation is devoted to the study of self-similar groups and related topics. It consists of three parts. The first part is devoted to the study of examples of finitely generated amenable groups for which every ...
ficient thermal energy, leading to a different STP (27). Similar temperature-dependent be-
Savrasov, Sergej Y.
ficient thermal energy, leading to a different STP (27). Similar temperature-dependent be- havior a bottom-up paradigm for spintronics manufacturing. Different conjugated molecules and QDs should provide
On a class of self-similar 2D surface water waves
Sijue Wu
2012-06-11
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.
Homothety and Quasi Self Similarity in Asymptotically Flat and AdS Spacetimes
Wenli Zhao
2015-03-02
For a spherically symmetric self-gravitating scalar field we study self similar and quasi-self similar solutions in asymptotically flat and AdS spacetimes in various dimensions. Our main approach relies on reducing the Einstein-Klein-Gordon system of equations under the self similarity assumption to a dynamical system. Applying standard techniques in the analysis of dynamical system we study the corresponding phase diagrams, gaining some insight into the short and long-term evolution of the system. In the asymptotically flat case the fixed points of the dynamical system correspond to conformally flat spacetimes. We observed a new transition from a fixed point to a black hole and we compute the corresponding exponent analytically. In the case of AdS spacetime, we observed the quasi self similar scalar field scattering to infinity after interfering near the center corresponding to the dynamical system with no fixed points.
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
Kagan, Grigory
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 hydrodynamic instabilities ...
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
The Expression of Determination: Similarities Between Anger and Approach-related Positive Affect
Harmon-Jones, Cindy
2011-02-22
THE EXPRESSION OF DETERMINATION: SIMILARITIES BETWEEN ANGER AND APPROACH-RELATED POSITIVE AFFECT A Thesis by CINDY HARMON-JONES Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 2009 Major Subject: Psychology THE EXPRESSION OF DETERMINATION: SIMILARITIES BETWEEN ANGER AND APPROACH-RELATED POSITIVE AFFECT A Thesis by CINDY HARMON-JONES Submitted...
A comparison of the performance of waterfloods using similar refined and crude oils
Walton, Daylon Lynn
1960-01-01
A COMPARISON OF THE PERFORMANCE OF WATERFI, GODS USING SIMILAR REFINED AND CRUDE OILS A Thesis By DAYLON L. WALTON Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August, 1960 Major Subject: PETROLEUM ENGINEERING A COMPARISON OF THE PERFORMANCE OF WATERFLOODS USING SIMILAR REFINED AND CRUDE OILS A Thesis By DAYLON L. WALTON Approved as to style and content by: (Chairman f...
Measuring semantic similarities by combining gene ontology annotations and gene co-function networks
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Peng, Jiajie; Uygun, Sahra; Kim, Taehyong; Wang, Yadong; Rhee, Seung Y.; Chen, Jin
2015-02-14
Background: Gene Ontology (GO) has been used widely to study functional relationships between genes. The current semantic similarity measures rely only on GO annotations and GO structure. This limits the power of GO-based similarity because of the limited proportion of genes that are annotated to GO in most organisms. Results: We introduce a novel approach called NETSIM (network-based similarity measure) that incorporates information from gene co-function networks in addition to using the GO structure and annotations. Using metabolic reaction maps of yeast, Arabidopsis, and human, we demonstrate that NETSIM can improve the accuracy of GO term similarities. We also demonstratemore »that NETSIM works well even for genomes with sparser gene annotation data. We applied NETSIM on large Arabidopsis gene families such as cytochrome P450 monooxygenases to group the members functionally and show that this grouping could facilitate functional characterization of genes in these families. Conclusions: Using NETSIM as an example, we demonstrated that the performance of a semantic similarity measure could be significantly improved after incorporating genome-specific information. NETSIM incorporates both GO annotations and gene co-function network data as a priori knowledge in the model. Therefore, functional similarities of GO terms that are not explicitly encoded in GO but are relevant in a taxon-specific manner become measurable when GO annotations are limited.« less
I. Ya. Aref'eva; I. V. Volovich
2007-10-25
Recently, black hole and brane production at CERN's Large Hadron Collider (LHC) has been widely discussed. We suggest that there is a possibility to test causality at the LHC. We argue that if the scale of quantum gravity is of the order of few TeVs, proton-proton collisions at the LHC could lead to the formation of time machines (spacetime regions with closed timelike curves) which violate causality. One model for the time machine is a traversable wormhole. We argue that the traversable wormhole production cross section at the LHC is of the same order as the cross section for the black hole production. Traversable wormholes assume violation of the null energy condition (NEC) and an exotic matter similar to the dark energy is required. Decay of the wormholes/time machines and signatures of time machine events at the LHC are discussed.
A nonlinear eigenvalue problem for self-similar spherical force-free magnetic fields
Lerche, I.; Low, B. C.
2014-10-15
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.
Heat release by controlled continuous-time Markov jump processes
Paolo Muratore-Ginanneschi; Carlos Mejía-Monasterio; Luca Peliti
2012-12-17
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.
EsPRESSo: Efficient Privacy-Preserving Evaluation of Sample Set Similarity
Blundo, Carlo; Gasti, Paolo
2011-01-01
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.
D.M. Reiner; T.E. Curry; M.A. de Figueiredo; H.J. Herzog; S.D. Ansolabehere; K. Itaoka; F. Johnsson; M. Odenberger
2006-04-01
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.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
UGE Scheduler Cycle Time UGE Scheduler Cycle Time Genepool Cycle Time Genepool Daily Genepool Weekly Phoebe Cycle Time Phoebe Daily Phoebe Weekly What is the Scheduler Cycle? The...
Receding Horizon Covariance Control
Wendel, Eric
2012-10-19
Covariance assignment theory, introduced in the late 1980s, provided the only means to directly control the steady-state error properties of a linear system subject to Gaussian white noise and parameter uncertainty. This theory, however, does...
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...
Not Available
1981-07-01
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
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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submitKansasCommunitiesof Energy8) WignerEnergyAbout Us Hanford1MAY99a *
Local-global alignment for finding 3D similarities in protein structures
Zemla, Adam T. (Brentwood, CA)
2011-09-20
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.
V. S. Timoteo; S. Szpigel; F. O. Duraes
2011-04-24
We apply the similarity renormalization group (SRG) approach to evolve a nucleon-nucleon ($NN$) interaction in leading-order (LO) chiral effective field theory (ChEFT), renormalized within the framework of the subtracted kernel method (SKM). We derive a fixed-point interaction and show the renormalization group (RG) invariance in the SKM approach. We also compare the evolution of $NN$ potentials with the subtraction scale through a SKM RG equation in the form of a non-relativistic Callan-Symanzik (NRCS) equation and the evolution with the similarity cutoff through the SRG transformation.
Jamie M. Foster; Dmitry E. Pelinovsky
2015-06-16
We consider the slow nonlinear diffusion equation subject to a constant absorption rate and construct local self-similar solutions for reversing (and anti-reversing) interfaces, where an initially advancing (receding) interface gives way to a receding (advancing) one. We use an approach based on invariant manifolds, which allows us to determine the required asymptotic behaviour for small and large values of the concentration. We then `connect' the requisite asymptotic behaviours using a robust and accurate numerical scheme. By doing so, we are able to furnish a rich set of self-similar solutions for both reversing and anti-reversing interfaces.
Time and Labor Manual -Time Keepers -LSUSH
Time and Labor Manual - Time Keepers - LSUSH Version Date: July 2012 #12;COPYRIGHT & TRADEMARKS create a risk of personal injury. If you use this software in dangerous applications, then you shall Guide Time and Labor Manual - Time Keepers - LSUSH Page iii Table of Contents Time and Labor Manual
Time Commitments Where Does Your Time Go
Kunkle, Tom
Time Commitments Where Does Your Time Go Everyone starts the week with the same number of hours. So, why does your time go so fast? Let's find out! Number of hours of sleep each night ____ x 7 preparation/clean-up time) ____ x 7 = ____ Travel time to and from campus ___ x __ = ____ Number of hours per
The Solar-Stellar-MHD Connection We focus on the magnetic-field driven similarities,
The Solar-Stellar-MHD Connection We focus on the magnetic-field driven similarities, and differences, between our Sun and other solar- type stars (the "solar-stellar connection"). Are the properties, and the build-up of a planetary magnetic field must have been achieved early on in the Sun's 4.5 billion year
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
SchÃ¶nauer, Stefan
applications which are presented in this article are functional classification of proteins in biological search grows in application areas such as multimedia, medical imaging, molecular biology, computer aided imaging and computer aided design. In recent years, considerable work on similarity search in database
Oard, Doug
analysis thus leads directly to a need for bilingual topic aspect classification as a prerequisite taskEnglish and Chinese Bilingual Topic Aspect Classification: Exploring Similarity Measures, Optimal LSA Dimensions, and Centroid Correction of Translated Training Examples Yejun Wu School of Library
Similarity Networks of the Functional Evolution of Cycles in Structural David M. Walker
Froyland, Gary
Similarity Networks of the Functional Evolution of Cycles in Structural Networks David M. Walker.g. minerals, soil, chemical powders and pills, food grains etc.). When subjected to different stresses is to introduce a new way of using networks to study the functional role grains play in the structural evolution
The Structure of Naked Singularity in Self-similar Gravitational Collapse II
P. S. Joshi; I. H. Dwivedi
1993-02-09
Generalizing the results of Joshi and Dwivedi in Commun.Math.Phys. 146, p.333 (1992), it is pointed out that strong curvature naked singularities could occur in the self-similar gravitational collapse of any form of matter satisfying the weak energy condition for the positivity of mass-energy density.
Naked singularities in non-self-similar gravitational collapse of radiation shells
Joshi, P.S.; Dwivedi, I.H. )
1992-03-15
Non-self-similar gravitational collapse of imploding radiation is shown to give rise to a strong curvature naked singularity. The conditions are specified for the singularity to be globally naked and the strength of the same is examined along nonspacelike curves and along all the families of nonspacelike geodesics terminating at the singularity in the past.
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
Parallel seed-based approach to multiple protein structure similarities detection
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Chapuis, Guillaume; Le Boudic-Jamin, Mathilde; Andonov, Rumen; Djidjev, Hristo; Lavenier, Dominique
2015-01-01
Finding similarities between protein structures is a crucial task in molecular biology. Most of the existing tools require proteins to be aligned in order-preserving way and only find single alignments even when multiple similar regions exist. We propose a new seed-based approach that discovers multiple pairs of similar regions. Its computational complexity is polynomial and it comes with a quality guarantee—the returned alignments have both root mean squared deviations (coordinate-based as well as internal-distances based) lower than a given threshold, if such exist. We do not require the alignments to be order preserving (i.e., we consider nonsequential alignments), which makesmore »our algorithm suitable for detecting similar domains when comparing multidomain proteins as well as to detect structural repetitions within a single protein. Because the search space for nonsequential alignments is much larger than for sequential ones, the computational burden is addressed by extensive use of parallel computing techniques: a coarse-grain level parallelism making use of available CPU cores for computation and a fine-grain level parallelism exploiting bit-level concurrency as well as vector instructions.« less
Self-similarity of the plasma edge fluctuations B. A. Carreras
van Milligen, Boudewijn
long-range dependence in plasma edge fluctuations Mandelbrot and Wallis, Water Resources Res. 4, 909 1969 . This technology has been applied to data from several confinement devices such as tokamaks, stellarators, and reversed-field pinch. The results reveal the self-similar character of the electrostatic
Hooper, Scott
Different Motor Neuron Spike Patterns Produce Contractions With Very Similar Rises in Graded Slow December 2006 Hooper SL, Guschlbauer C, von Uckermann G, Bu¨schges A. Differ- ent motor neuron spike twitches in response to individual motor neuron spikes. During the early part of their contractions
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
Influence of heterogeneity on second-kind self-similar solutions for viscous gravity currents
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Zheng, Zhong; Christov, Ivan C.; Stone, Howard A.
2014-04-16
We report experimental, theoretical and numerical results on the effects of horizontal heterogeneities on the propagation of viscous gravity currents. We use two geometries to highlight these effects: (a) a horizontal channel (or crack) whose gap thickness varies as a power-law function of the streamwise coordinate; (b) a heterogeneous porous medium whose permeability and porosity have power-law variations. We demonstrate that two types of self-similar behaviours emerge as a result of horizontal heterogeneity: (a) a first-kind self-similar solution is found using dimensional analysis (scaling) for viscous gravity currents that propagate away from the origin (a point of zero permeability); (b)more »a second-kind self-similar solution is found using a phase-plane analysis for viscous gravity currents that propagate toward the origin. These theoretical predictions, obtained using the ideas of self-similar intermediate asymptotics, are compared with experimental results and numerical solutions of the governing partial differential equation developed under the lubrication approximation. All three results are found to be in good agreement.« less
IEEE TRANS. ON IMAGE PROCESSING 1 Self-Similar Anisotropic Texture Analysis: the
Roux, Stephane
IEEE TRANS. ON IMAGE PROCESSING 1 Self-Similar Anisotropic Texture Analysis: the Hyperbolic Wavelet Transform Contribution S.G. Roux(1), M. Clausel(2), B. Vedel(3), S. Jaffard(4), P. Abry(1), IEEE Fellow (1 8050, Cr´eteil, France. Copyright (c) 2013 IEEE. Personal use of this material is permitted. However
Hall Effect Thruster Plasma Plume Characterization with Probe Measurements and Self-Similar Fluid
Carlos III de Madrid, Universidad
Hall Effect Thruster Plasma Plume Characterization with Probe Measurements and Self-Similar Fluid§ Universidad Polit´ecnica de Madrid, Madrid 28040 Spain A characterization of the far-field plasma plume of two Hall effect thrusters was per- formed by means of a comparison between experimental plasma properties
Utilization Filtering of Macros Based on Goal Similarity Uri Keidar, Shaul Markovitch & Erez Webman
Markovitch, Shaul
Utilization Filtering of Macros Based on Goal Similarity Uri Keidar, Shaul Markovitch & Erez Webman as well as bene ts. When the costs outweigh the bene ts, we face the utility problem. The vast number of macros available to the learner forces it to be selective to avoid the utility problem. The most common
USER-ASSISTED OBJECT DETECTION BY SEGMENT BASED SIMILARITY MEASURES IN MOBILE LASER SCANNER DATA
USER-ASSISTED OBJECT DETECTION BY SEGMENT BASED SIMILARITY MEASURES IN MOBILE LASER SCANNER DATA S WORDS: Segmentation, Object Detection, Semi-Automatic, Mobile Mapping Systems, Segment based in fields related to urban safety analyses and/or asset management. Many MMS systems carry video cameras
Yaron, David
Embedding parameters in ab initio theory to develop well- controlled approximations based Journal of Chemical Theory and Computation #12;1 Embedding parameters in ab initio theory to develop well-controlled on molecular similarity Journal: Journal of Chemical Theory and Computation Manuscript ID: Draft Manuscript
Stavrakakis, Ioannis
Exploiting user interest similarity and social links for micro-blog forwarding in mobile,mkaralio,ioannis}@di.uoa.gr Abstract Micro-blogging services have recently been experiencing increasing success among Web users. Differ- ent to traditional online social applications, micro-blogs are lightweight, require small cognitive
Johnson, Kevin P.
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
Boyd, Robert W.
Material slow light and structural slow light: similarities and differences for nonlinear optics There are two standard methods for controlling the group velocity of light. One makes use of the dispersive nonlinear optical processes are enhanced through use of slow-light interactions and when they are not
Paper Doll Parsing: Retrieving Similar Styles to Parse Clothing Items Kota Yamaguchi
Berg, Tamara L.
Paper Doll Parsing: Retrieving Similar Styles to Parse Clothing Items Kota Yamaguchi Stony Brook (paper doll item transfer) from retrieved examples. Exper- imental evaluation shows that our approach clothing and body pose to constrain prediction and produce a more accurate parse. We call this paper doll
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 Exclusion Zone. This initiative was expanded in 2011 to include the impacts of the Fukushima disaster on wildlife in contaminated areas of Japan. Although the Fukushima accident is a terrible disaster, it has
Discriminating Among Word Meanings By Identifying Similar Contexts Amruta Purandare and Ted Pedersen
Pedersen, Ted
Discriminating Among Word Meanings By Identifying Similar Contexts Amruta Purandare and Ted}@d.umn.edu http://senseclusters.sourceforge.net Abstract Word sense discrimination is an unsupervised clustering problem, which seeks to discover which instances of a word/s are used in the same meaning. This is done
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 The current direction in the phases, which is out of the terminals for generator operation, produces a flux is not coupled with any other circuit. We can write a voltage equation for each of the phase windings as follows
Parallel seed-based approach to multiple protein structure similarities detection
Chapuis, Guillaume [INRIA/IRISA and Univ. of Rennes, Rennes Cedex (France); Le Boudic-Jamin, Mathilde [INRIA/IRISA and Univ. of Rennes, Rennes Cedex (France); Andonov, Rumen [INRIA/IRISA and Univ. of Rennes, Rennes Cedex (France)] (ORCID:0000000348427102); Djidjev, Hristo [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lavenier, Dominique [INRIA/IRISA and Univ. of Rennes, Rennes Cedex (France)] (ORCID:000000032557680X)
2015-01-01
Finding similarities between protein structures is a crucial task in molecular biology. Most of the existing tools require proteins to be aligned in order-preserving way and only find single alignments even when multiple similar regions exist. We propose a new seed-based approach that discovers multiple pairs of similar regions. Its computational complexity is polynomial and it comes with a quality guarantee—the returned alignments have both root mean squared deviations (coordinate-based as well as internal-distances based) lower than a given threshold, if such exist. We do not require the alignments to be order preserving (i.e., we consider nonsequential alignments), which makes our algorithm suitable for detecting similar domains when comparing multidomain proteins as well as to detect structural repetitions within a single protein. Because the search space for nonsequential alignments is much larger than for sequential ones, the computational burden is addressed by extensive use of parallel computing techniques: a coarse-grain level parallelism making use of available CPU cores for computation and a fine-grain level parallelism exploiting bit-level concurrency as well as vector instructions.
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
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
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
Hofmann, Hans A.
Sex differences and similarities in the neuroendocrine regulation of social behavior in an African and within the social states or sexes. We aimed to determine sex-specific attributes of social status by comparing circulating sex steroid hormones and neural gene expression of sex steroid receptors in dominant
Drug-Target Interaction Prediction for Drug Repurposing with Probabilistic Similarity Logic
Daume III, Hal
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
Hill Climbing Algorithms for Content-Based Retrieval of Similar Configurations
Papadias, Dimitris
Hill Climbing Algorithms for Content-Based Retrieval of Similar Configurations Dimitris Papadias Department of Computer Science Hong Kong University of Science and Technology Clear Water Bay, Hong Kong +852 is an important form of content-based retrieval. Exhaustive processing (i.e., retrieval of the best solutions
We incorporated the dental and vertebral similarities of Fruitafossor, tubulidentates, and
Reich, David
intervertebral articulations help the vertebral column resist torsion produced by digging (35). We suggestWe incorporated the dental and vertebral similarities of Fruitafossor, tubulidentates, Vertebr. PalAsiat. 36, 102 (1998). 6. A. Weil, Nature 416, 798 (2002). 7. Z.-X. Luo, Q. Ji, J. R. Wible, C
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
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
Book Reviews Semantic Interpretation and the Resolution of Ambiguity Similar discussions apply, continuing work by Eric Atwell and Geoffrey Sampson at Leeds has greatly improved on this figure, using Theory 6:129-137. Sampson, Geoffrey1986SimulatedAnnealingas a ParsingTech- nique. In Universityof Leeds
Radial standing and self-similar waves for the hyperbolic cubic NLS in 2D
P. G. Kevrekidis; A. R. Nahmod; C. Zeng
2011-02-11
In this note we propose a new set of coordinates to study the hyperbolic or non-elliptic cubic nonlinear Schrodinger equation in two dimensions. Based on these coordinates, we study the existence of bounded and continuous hyperbolically radial standing waves, as well as hyperbolically radial self-similar solutions. Many of the arguments can easily be adapted to more general nonlinearities.
Elastic Lennard-Jones polymers meet clusters: Differences and similarities Stefan Schnabel,1,a
Janke, Wolfhard
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
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
Lee, Leslie
2011-01-01
.pdf.txt Content-Type text/plain; charset=windows-1252 Winter 2011 tx H2O 3 or just a drop in thebucket?Texas scientists on the real e?ects of the Deepwater Horizon oil spill 4 tx H2O Winter 2011 Environmental Disaster Continued What if gasoline... used by some oil companies,? Bianchi commented to Texas A&M News & Information Services in November. ??ey use high pressure water systems, which on rocks is ?ne, but not on plant material. So this has likely cut them [the plant material] back so...
Lee, Leslie
2011-01-01
.pdf.txt Content-Type text/plain; charset=windows-1252 Winter 2011 tx H2O 3 or just a drop in thebucket?Texas scientists on the real e?ects of the Deepwater Horizon oil spill 4 tx H2O Winter 2011 Environmental Disaster Continued What if gasoline... used by some oil companies,? Bianchi commented to Texas A&M News & Information Services in November. ??ey use high pressure water systems, which on rocks is ?ne, but not on plant material. So this has likely cut them [the plant material] back so...
Discrete Self-Similarity Of RR Lyrae Stars II. Period Spectrum For A Very Large Sample
R. L. Oldershaw
2006-06-06
A recent paper demonstrated a considerable degree of self-similarity between RR Lyrae stars and their atomic scale analogues: excited helium atoms undergoing single-level transition between n = 7 and n = 10. Discrete self-similarity between these fractal analogues was indentified in terms of their masses, radii, oscillation periods, basic morphologies and kinematics. In this second paper on the subject, an extremely large and carefully analyzed sample of RR Lyrae oscillation periods provides further evidence for a unique match between the predicted set of discrete periods, based exclusively on the known helium spectrum and the discrete scaling equations of a fractal cosmological paradigm, and the observed period spectra of RR Lyrae stars.
Self-Similar Blowup Solutions to the 2-Component Degasperis-Procesi Shallow Water System
Manwai Yuen
2010-08-13
In this article, we study the self-similar solutions of the 2-component Degasperis-Procesi water system:% [c]{c}% \\rho_{t}+k_{2}u\\rho_{x}+(k_{1}+k_{2})\\rho u_{x}=0 u_{t}-u_{xxt}+4uu_{x}-3u_{x}u_{xx}-uu_{xxx}+k_{3}\\rho\\rho_{x}=0. By the separation method, we can obtain a class of self-similar solutions,% [c]{c}% \\rho(t,x)=\\max(\\frac{f(\\eta)}{a(4t)^{(k_{1}+k_{2})/4}},\\text{}0),\\text{}u(t,x)=\\frac{\\overset{\\cdot}{a}(4t)}{a(4t)}x \\overset{\\cdot\\cdot}{a}(s)-\\frac{\\xi}{4a(s)^{\\kappa}}=0,\\text{}a(0)=a_{0}% \
Random Vortex-Street Model for a Self-Similar Plane Turbulent Jet
Victor L'vov; Anna Pomyalov; Itamar Procaccia; Rama Govindarajan
2008-03-18
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.
Eta Carinae and Nebulae Around Massive Stars: Similarities to Planetary Nebulae?
Nathan Smith
2008-02-13
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.
Time Scales in Spectator Fragmentation
C. Schwarz; for the ALADIN collaboration
2000-09-07
Proton-proton correlations and correlations of p-alpha, d-alpha, and t-alpha from spectator decays following Au + Au collisions at 1000 AMeV have been measured with an highly efficient detector hodoscope. The constructed correlation functions indicate a moderate expansion and low breakup densities similar to assumptions made in statistical multifragmentation models. In agreement with a volume breakup rather short time scales were deduced employing directional cuts in proton-proton correlations. PACS numbers: 25.70.Pq, 21.65.+f, 25.70.Mn
Eliashvili, M
1994-01-01
We've defined a non-unitary similarity transformation interconnecting the spectrum generating quantum operators and state vectors of integral and fractional QHE. This transformation corresponds to the introduction of the complex Chern-Simons gauge potentials, in terms of wich the field- theoretic formulation of FQHE can be developed. As a first step the second quantized form of Laughlin wave function is given.
Multiple ``time step'' Monte Carlo Balazs Hetenyia)
Berne, Bruce J.
and nuclear degrees of free- dom respectively. ANESMC was particularly designed to treat polarizable systems in CPU time can be achieved. Common criteria of separation into rapidly and slowly varying parts6 procedure is similar in spirit but different in signifi- cant ways from the adiabatic nuclear and electronic
Time Crystals from Minimum Time Uncertainty
Mir Faizal; Mohammed M. Khalil; Saurya Das
2014-12-29
Motivated by the Generalized Uncertainty Principle, covariance, and a minimum measurable time, we propose a deformation of the Heisenberg algebra, and show that this leads to corrections to all quantum mechanical systems. We also demonstrate that such a deformation implies a discrete spectrum for time. In other words, time behaves like a crystal.
Similarity between quantum mechanics and thermodynamics: Entropy, temperature, and Carnot cycle
Sumiyoshi Abe; Shinji Okuyama
2011-03-04
Similarity between quantum mechanics and thermodynamics is discussed. It is found that if the Clausius equality is imposed on the Shannon entropy and the analogue of the heat quantity, then the value of the Shannon entropy comes to formally coincide with that of the von Neumann entropy of the canonical density matrix, and pure-state quantum mechanics apparently transmutes into quantum thermodynamics. The corresponding quantum Carnot cycle of a simple two-state model of a particle confined in a one-dimensional infinite potential well is studied, and its efficiency is shown to be identical to the classical one.
Similarity between quantum mechanics and thermodynamics: Entropy, temperature, and Carnot cycle
Abe, Sumiyoshi
2010-01-01
Similarity between quantum mechanics and thermodynamics is discussed. It is found that if the Clausius equality is imposed on the Shannon entropy and the analogue of the heat quantity, then the value of the Shannon entropy comes to formally coincide with that of the von Neumann entropy of the canonical density matrix, and pure-state quantum mechanics apparently transmutes into quantum thermodynamics. The corresponding quantum Carnot cycle of a simple two-state model of a particle confined in a one-dimensional infinite potential well is studied, and its efficiency is shown to be identical to the classical one.
Sanfilippo, Antonio P.; Posse, Christian; Gopalan, Banu; Tratz, Stephen C.; Gregory, Michelle L.
2006-06-08
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.
Oblique and conical shock similarity laws for non-equilibrium flows
Holster, Jesse Louis
1968-01-01
Ratios for Dissociating Air over a 4(-Degree Cone, . . . . . . . . . . . . . . . . . . . . 44 V11 LIST OF SY~i(DOLS C P VIB E eD h kl, k2 L A U Constant, equation ($) Constant, equation (g) Consi. ani. , equation (5) / ft2 Specific heat... the Landau-Teller vibrational relaxation equation v. T' 'Veq v (4) and the hypersonic normal shock relations, the similarity 6 parameter became A P& L exp( B Nl 1 -CE vl B T 1 1 -1/3 Tl ) -2/3, exp(-B i~f Tl 1 (5) -1/3 ) = constant. If the gas...
Differences and similarities in the analysis of Lorenz, Chen, and Lu systems
G. A. Leonov; N. V. Kuznetsov
2014-09-27
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.
Cai, Ximing; Hejazi, Mohamad I.; Wang, Dingbao
2011-09-29
This paper presents a modeling framework for real-time decision support for irrigation scheduling using the National Oceanic and Atmospheric Administration's (NOAA's) probabilistic rainfall forecasts. The forecasts and their probability distributions are incorporated into a simulation-optimization modeling framework. In this study, modeling irrigation is determined by a stochastic optimization program based on the simulated soil moisture and crop water-stress status and the forecasted rainfall for the next 1-7 days. The modeling framework is applied to irrigated corn in Mason County, Illinois. It is found that there is ample potential to improve current farmers practices by simply using the proposed simulation-optimization framework, which uses the present soil moisture and crop evapotranspiration information even without any forecasts. It is found that the values of the forecasts vary across dry, normal, and wet years. More significant economic gains are found in normal and wet years than in dry years under the various forecast horizons. To mitigate drought effect on crop yield through irrigation, medium- or long-term climate predictions likely play a more important role than short-term forecasts. NOAA's imperfect 1-week forecast is still valuable in terms of both profit gain and water saving. Compared with the no-rain forecast case, the short-term imperfect forecasts could lead to additional 2.4-8.5% gain in profit and 11.0-26.9% water saving. However, the performance of the imperfect forecast is only slightly better than the ensemble weather forecast based on historical data and slightly inferior to the perfect forecast. It seems that the 1-week forecast horizon is too limited to evaluate the role of the various forecast scenarios for irrigation scheduling, which is actually a seasonal decision issue. For irrigation scheduling, both the forecast quality and the length of forecast time horizon matter. Thus, longer forecasts might be necessary to evaluate the role of forecasts for irrigation scheduling in a more effective way.
Comptonizing Efficiencies of IGR 17091-3624 and its similarity to GRS 1915+105
Pal, Partha Sarathi
2015-01-01
Variability classes in the enigmatic black hole candidate GRS 1915+105 are known to be correlated with the variation of the Comptonizing Efficiency (CE) which is defined to be the ratio between the number of power-law (hard) photons and seed (soft) photons injected into the Compton cloud. Similarities of light curves of several variability classes of GRS 1915+105 and IGR 17091-3624, some of which are already reported in the literature, motivated us to compute CE for IGR 17091-3624 as well. We find that they are similar to what were reported earlier for GRS 1915+105, even though masses of these objects could be different. The reason is that the both the sizes of the sources of the seed photons and of the Comptonizing corona scale in the same way as the mass of the black hole. This indicates that characterization of variability classes based on CE is likely to be black hole mass independent, in general.
Matteus Tanha; Shiva Kaul; Alex Cappiello; Geoffrey J. Gordon; David J. Yaron
2013-11-14
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 quantum chemistry.
Time-Energy Costs of Quantum Measurements
Chi-Hang Fred Fung; H. F. Chau
2014-05-08
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.
Space time and the passage of time
George F. R. Ellis; Rituparno Goswami
2012-08-26
This paper examines the various arguments that have been put forward suggesting either that time does not exist, or that it exists but its flow is not real. I argue that (i) time both exists and flows; (ii) an Evolving Block Universe (`EBU') model of spacetime adequately captures this feature, emphasizing the key differences between the past, present, and future; (iii) the associated surfaces of constant time are uniquely geometrically and physically determined in any realistic spacetime model based in General Relativity Theory; (iv) such a model is needed in order to capture the essential aspects of what is happening in circumstances where initial data does not uniquely determine the evolution of spacetime structure because quantum uncertainty plays a key role in that development. Assuming that the functioning of the mind is based in the physical brain, evidence from the way that the mind apprehends the flow of time prefers this evolving time model over those where there is no flow of time.
Mayeda, K; Malagnini, L; Walter, W R
2007-03-16
This study is motivated by renewed interest within the seismic source community to resolve the long-standing question on energy scaling of earthquakes, specifically, 'Do earthquakes scale self-similarly or are large earthquakes dynamically different than small ones?' This question is important from a seismic hazard prediction point of view, as well as for understanding basic rupture dynamics for earthquakes. Estimating the total radiated energy (ER) from earthquakes requires significant broadband corrections for path and site effects. Moreover, source radiation pattern and directivity corrections can be equally significant and also must be accounted for. Regional studies have used a number of different methods, each with their own advantages and disadvantages. These methods include: integration of squared shear wave moment-rate spectra, direct integration of broadband velocity-squared waveforms, empirical Green's function deconvolution, and spectral ratio techniques. The later two approaches have gained popularity because adjacent or co-located events recorded at common stations have shared path and site effects, which therefore cancel. In spite of this, a number of such studies find very large amplitude variance across a network of stations. In this paper we test the extent to which narrowband coda envelopes can improve upon the traditional spectral ratio using direct phases, allowing a better comparison with theoretical models to investigate similarity. The motivation for using the coda is its stability relative to direct waves and its unique property of spatially homogenizing its energy. The local and regional coda is virtually insensitive to lateral crustal heterogeneity and source radiation pattern, and the use of the coda might allow for more stable amplitude ratios to better constrain source differences between event pairs. We first compared amplitude ratio performance between local and near-regional S and coda waves in the San Francisco Bay region for moderate-sized events, then applied the coda spectral ratio method to the 1999 Hector Mine mainshock and some of its larger aftershocks. We find: (1) Average amplitude ratio standard deviations using coda are {approx}0.05 to 0.12, roughly a factor of 3 smaller than direct S-waves for 0.2 < f < 15.0 Hz; (2) Coda spectral ratios for the M{sub w} 7.1 Hector Mine earthquake and its aftershocks show a clear departure from self-similarity, consistent with other studies using the same datasets; (3) Event-pairs (Green's function and target events) can be separated by as much as {approx}25 km for coda amplitudes without any appreciable degradation, in sharp contrast to direct waves.
Self-similar non-equilibrium dynamics of a many-body system with power-law interactions
Gutiérrez, Ricardo; Lesanovsky, Igor
2015-01-01
The influence of power-law interactions on the dynamics of many-body systems far from equilibrium is much less explored than their effect on static and thermodynamic properties. To gain insight into this problem we introduce and analyze here an out-of-equilibrium deposition process in which the deposition rate of a given particle depends as a power-law on the distance to previously deposited particles. Although rather simplistic this model draws its relevance from recent experimental progress in the domain of cold atomic gases which are studied in a setting where atoms that are excited to high-lying Rydberg states interact through power-law potentials that translate into power-law excitation rates. The out-of-equilibrium dynamics of this system turns out to be surprisingly rich. It features a self-similar evolution which leads to a characteristic power-law time dependence of observables such as the particle concentration and results in a scale invariance of the structure factor. Moreover, it displays a crosso...
White, Lynn
2000-06-27
People view time in different ways, but we all could do a better job of managing our time. This publication explains three different time management tools: the 24-hour time log and chart; a self-assessment of thinking styles and time management...
Wave Propagation in Gravitational Systems: Late Time Behavior
E. S. C. Ching; P. T. Leung; W. M. Suen; K. Young
1995-07-14
It is well-known that the dominant late time behavior of waves propagating on a Schwarzschild spacetime is a power-law tail; tails for other spacetimes have also been studied. This paper presents a systematic treatment of the tail phenomenon for a broad class of models via a Green's function formalism and establishes the following. (i) The tail is governed by a cut of the frequency Green's function $\\tilde G(\\omega)$ along the $-$~Im~$\\omega$ axis, generalizing the Schwarzschild result. (ii) The $\\omega$ dependence of the cut is determined by the asymptotic but not the local structure of space. In particular it is independent of the presence of a horizon, and has the same form for the case of a star as well. (iii) Depending on the spatial asymptotics, the late time decay is not necessarily a power law in time. The Schwarzschild case with a power-law tail is exceptional among the class of the potentials having a logarithmic spatial dependence. (iv) Both the amplitude and the time dependence of the tail for a broad class of models are obtained analytically. (v) The analytical results are in perfect agreement with numerical calculations.
Method for recycling tires and similarly compounded materials to recover usable constituents
Letsch, W.
1980-12-23
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.
Self-similarity of negative particle production from the Beam Energy Scan Program at STAR
M. V. Tokarev
2015-09-22
We present the spectra of negative charged particle production in Au+Au collisions from STAR for the first phase of the RHIC Beam Energy Scan Program measured over a wide range of collision energy sqrt s{NN}=7.7-200 GeV, and transverse momentum of produced particle in different centralities at |eta|energy which enhances with pT. An indication of self-similarity of negative charged particle production in Au+Au collisions is found. The constituent energy loss as a function of energy and centrality of collisions and transverse momentum of inclusive particle was estimated in the $z$-scaling approach. The energy dependence of the model parameters - the fractal and fragmentation dimensions and "specific heat", was studied.
Similarity, entropy and subsethood measures based on cardinality of soft hybrid sets
R?dvan ?ahin
2014-12-15
The real world is inherently uncertain, imprecise and vague. Soft set theory was firstly introduced by Molodtsov in 1999 as a general mathematical tool for dealing with uncertainties, not clearly defined objects. A soft set consists of two parts which are parameter set and approximate value set. So while talking about any property on a soft set, it is notable to consider that each parts should be evaluated separately. In this paper, by taking into account this case, we firstly define the concept of cardinality of soft hybrid sets which are soft set, fuzzy soft set, fuzzy parameterized soft set and fuzzy parameterized fuzzy soft set. Then we discuss the entropy, similarity and subsethood measures based on cardinality in a soft hybrid set, and investigate the relationships among these concepts as well as related examples. Finally, we present an application which is a representation method based on cardinality of a soft hybrid space.
Wang, F. Y.; Yi, S. X.; Dai, Z. G. [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
2014-05-01
Active galactic nuclei and gamma-ray bursts (GRBs) are powerful astrophysical events with relativistic jets. In this Letter, the broadband spectral properties of GRBs and well-observed blazars are compared. The distribution of GRBs is consistent with the well-known blazar sequence including the ?L {sub ?}(5 GHz) – ?{sub RX} and ?L {sub ?}(5 GHz) – ?{sub peak} correlations, where ?{sub RX} is defined as the broadband spectral slope in radio-to-X-ray bands, and ?{sub peak} is defined as the spectral peak frequency. Moreover, GRBs occupy the low radio luminosity end of these sequences. These two correlations suggest that GRBs could have a radiation process, i.e., synchrotron radiation, similar to blazars both in the prompt emission and afterglow phases.
The Magnus expansion and the in-medium similarity renormalization group
T. D. Morris; N. Parzuchowski; S. K. Bogner
2015-08-03
We present an improved variant of the in-medium similarity renormalization group (IM-SRG) based on the Magnus expansion. In the new formulation, one solves flow equations for the anti-hermitian operator that, upon exponentiation, yields the unitary transformation of the IM-SRG. The resulting flow equations can be solved using a first-order Euler method without any loss of accuracy, resulting in substantial memory savings and modest computational speedups. Since one obtains the unitary transformation directly, the transformation of additional operators beyond the Hamiltonian can be accomplished with little additional cost, in sharp contrast to the standard formulation of the IM-SRG. Ground state calculations of the homogeneous electron gas (HEG) and $^{16}$O nucleus are used as test beds to illustrate the efficacy of the Magnus expansion.
Self-similar solution of the problem of consolidation and thawing of frozen soil
Klement'ev, A.F.; Klement'eva, E.A.
1988-10-01
This article presents a new mathematical model of the process of thawing of frozen soil taking consolidation into account. Two solutions were obtained: the self-similar solution for the unidimensional biphase problem and an approximate analytical solution for the simplified single-phase problem. A comparison with the results of physical modeling showed that the method is fairly effective in the case of warm permafrost. The mean error in predicting the position of the interface between the thawed and frozen zones for different soils over a period of one to ten years amounted to 20.9%. The use of the method of the All-Union Research Institute of Pipeline Construction yielded an error of 31.6% and the method of the All-Union Research Institute of the Gas Industry an error of 39.6% by comparison.
Short-range correlations in nuclei with similarity renormalization group transformations
Thomas Neff; Hans Feldmeier; Wataru Horiuchi
2015-06-07
$\\mathbf{Background:}$ Realistic nucleon-nucleon interactions induce short-range correlations in nuclei. To solve the many-body problem unitary transformations like the similarity renormalization group (SRG) are often used to soften the interactions. $\\mathbf{Purpose:}$ Two-body densities can be used to illustrate how the SRG eliminates short-range correlations in the wave function. The short-range information can however be recovered by transforming the density operators. $\\mathbf{Method:}$ The many-body problem is solved for $^4$He in the no core shell model (NCSM) with SRG transformed AV8' and chiral N3LO interactions. The NCSM wave functions are used to calculate two-body densities with bare and SRG transformed density operators in two-body approximation. $\\mathbf{Results:}$ The two-body momentum distributions for AV8' and N3LO have similar high-momentum components up to relative momenta of about $2.5\\,\\mathrm{fm}^{-1}$, dominated by tensor correlations, but differ in their behavior at higher relative momenta. The contributions of many-body correlations are small for pairs with vanishing pair momentum but not negligible for the momentum distributions integrated over all pair momenta. Many-body correlations are induced by the strong tensor force and lead to a reshuffling of pairs between different spin-isospin channels. $\\mathbf{Conclusions:}$ When using the SRG it is essential to use transformed operators for observables sensitive to short-range physics. Back-to-back pairs with vanishing pair momentum are the best tool to study short-range correlations.
Resnik, P
2011-01-01
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.
Minnesota, University of
on consumption of energy from the environment. The amount of energy--per unit time per unit mass. Chownc , Peter B. Reichd , and Valery M. Gavrilove aTheoretical Physics Division, Petersburg Nuclear but unanswered biological question asks how much energy, on average, Earth's different life forms spend per unit
The perturbation equation of a static symmetrical homogeneous space-time
Jose L. Martinez-Morales
2009-09-26
In absence of explicit solutions of the perturbation equation of a static symmetrical homogeneous space-time, the best we can do is to construct a {\\it quasi-}transformation. In this framework, we solve the perturbation equation with initial data and a number of results are derived. Far from the horizon of a black hole of even space dimension $N$, a mass-less field decays as ${r^l} {{(-{r^2}+{t^2})}^{\\frac{1-N}{2}-l}}$ in space-time, where $l$ is a harmonic number of the sphere. A relation of energy and momentum of a particle with mass in a hyper black hole is discovered and a solution to the equation of Klein-Gordon in the metric of Schwarzschild-Tangherlini with initial data on the hypersphere is proposed. Also, the Green's function of the Klein-Gordon equation in Schwarzschild coordinates is calculated. This function is a sum on the harmonic modes of the sphere. The first term is a double integration on the spectrum of energy and the momentum of the particle. Far from the horizon, the double integration is approximated by an integration on a line defined by the relation of energy and momentum of a free particle. From here, the potential of Yukawa is derived. Finally, the linear perturbation equations are derived and solved exactly.
QGP time formation in holographic shock waves model of heavy ion collisions
Aref'eva, Irina Ya
2015-01-01
We estimate the thermalization time in two colliding shock waves holographic model of heavy-ion collisions. For this purpose we model the process by the Vaidya metric with a horizon defined by the trapped surface location. We consider two bottom-up AdS/QCD models that give, within the colliding shock waves approach, the dependence of multiplicity on the energy compatible with RHIC and LHC results. One model is a bottom-up AdS/QCD confining model and the other is related to an anisotropic thermalization. We estimate the thermalization time and show that increasing the confining potential decreases the thermalization time as well as an anisotropy accelerates the thermalization.
QGP time formation in holographic shock waves model of heavy ion collisions
Irina Ya. Aref'eva
2015-03-07
We estimate the thermalization time in two colliding shock waves holographic model of heavy-ion collisions. For this purpose we model the process by the Vaidya metric with a horizon defined by the trapped surface location. We consider two bottom-up AdS/QCD models that give, within the colliding shock waves approach, the dependence of multiplicity on the energy compatible with RHIC and LHC results. One model is a bottom-up AdS/QCD confining model and the other is related to an anisotropic thermalization. We estimate the thermalization time and show that increasing the confining potential decreases the thermalization time as well as an anisotropy accelerates the thermalization.
Time-lapse travel time change of multiply scattered acoustic waves
Snieder, Roel
.g., wave energy is transported in a process similar to heat diffusion. In medical imaging, for example of applications where detecting temporal changes may be useful include the monitoring of volcanoes, oil reservoirs time-lapse changes in the oil reservoir caused by a massive miscible CO2 flood to enhance oil recovery
J Mecinovic; P Snyder; K Mirica; S Bai; E Mack; R Kwant; D Moustakas; A Heroux; G Whitesides
2011-12-31
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).
On Time. 6b: Quantum Mechanical Time
C. K. Raju
2008-08-09
The existence of small amounts of advanced radiation, or a tilt in the arrow of time, makes the basic equations of physics mixed-type functional differential equations. The novel features of such equations point to a microphysical structure of time. This corresponds to a change of logic at the microphysical level. We show that the resulting logic is a quantum logic. This provides a natural and rigorous explanation of quantum interference. This structured-time interpretation of quantum mechanics is briefly compared with various other interpretations of q.m.
Structurally Similar but Functionally Diverse ZU5 Domains in Human Erythrocyte Ankyrin
Yasunaga, Mai; Ipsaro, Jonathan J.; Mondragón, Alfonso (NWU)
2014-10-02
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.
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
2015-01-01
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...
Toward Universality in Similarity Renormalization Group Evolved Few-body Potential Matrix Elements
Brian Dainton
2015-02-27
We first examine how T-matrix equivalence drives the flow of similarity renormalization group (SRG) evolved potential matrix elements to a universal form, with the ultimate goal of gaining insight into universality for three-nucleon forces. In agreement with observations made previously for Lee-Suzuki transformations, regions of universal potential matrix elements are restricted to where half-on-shell T-matrix equivalence holds, but the potentials must also reproduce binding energies. We find universality in local energy regions, reflecting a local decoupling by the SRG. To continue the study in the 3-body sector, we create a simple 1-D spinless boson "theoretical laboratory" for a dramatic improvement in computational efficiency. We introduce a basis-transformation, harmonic oscillator (HO) basis, which is used for current many-body calculations and discuss the imposed truncations. When SRG evolving in a HO-basis, we show that the evolved matrix elements, once transformed back into momentum-representation, differ from those when evolving with momentum representation. This is because the generator in each basis is not exactly the same due to the truncation, which creates evolution artifacts in the 3-body potential matrix elements. In the 2- body sector, this can be avoided by increasing the basis size, but it remains unclear whether this is possible in the 3-body sector, as truncation errors in the 3-body sector are more difficult to avoid, and the computational power required is greatly increased for three-body evolution.
Similarities of host defense mechanisms against pulmonary infectious disease in animals and man
Green, G.M.
1984-01-01
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.