cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stellar response after stripping as a model for common-envelope outcomes
Creators: name: Vigna-Gómez, Alejandro
name: Wassink, Michelle
name: Klencki, Jakub
name: Istrate, Alina
name: Nelemans, Gijs
name: Mandel, Ilya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Binary neutron stars have been observed as millisecond pulsars, gravitational-wave sources, and as the progenitors of short gamma-ray bursts and kilonovae. Massive stellar binaries that evolve into merging double neutron stars are believed to experience a common-envelope episode. During this episode, the envelope of a giant star engulfs the whole binary. The energy transferred from the orbit to the envelope by drag forces or from other energy sources can eject the envelope from the binary system, leading to a stripped short-period binary. In this paper, we use one-dimensional single stellar evolution to explore the final stages of the common-envelope phase in progenitors of neutron star binaries. We consider an instantaneously stripped donor star as a proxy for the common-envelope phase and study the star's subsequent radial evolution. We determine a range of stripping boundaries which allow the star to avoid significant rapid re-expansion and which thus represent plausible boundaries for the termination of the common-envelope episode. We find that these boundaries lie above the maximum compression point, a commonly used location of the core/envelope boundary. We conclude that stars may retain fractions of a solar mass of hydrogen-rich material even after the common-envelope episode. If we consider orbital energy as the only energy source available, all of our models would overfill their Roche lobe after ejecting the envelope, whose binding energy includes gravitational, thermal, radiation, and recombination energy terms.
description: 14 pages, 10 figures, 3 tables. Accepted for publication in MNRAS
Enhancing power system operation through online analytics
Creators: M. Kezunovic
S. Chatzivasileiadis
Y. Xu
P. Papadopoulos
C. Li
J. Cremer
A. Anderson
Publisher: name: IEEE
Year: 2022

Power systems globally are going through unprecedented changes, mainly driven by decarbonisation targets and the integration of Renewable Energy Sources. This is resulting in increasing complexity and uncertainty in various aspects of power system operation. At the same time increasing availability of measurements is becoming a reality, opening up great possibilities for data driven methods to enable useful insights and novel tools to be used in operational time scales, close to real time, when fast and reliable reaction is crucial.
Power systems globally are going through unprecedented changes, mainly driven by decarbonisation targets and the integration of Renewable Energy Sources. This is resulting in increasing complexity and uncertainty in various aspects of power system operation. At the same time increasing availability of measurements is becoming a reality, opening up great possibilities for data driven methods to enable useful insights and novel tools to be used in operational time scales, close to real time, when fast and reliable reaction is crucial.
Energy Storage Analytics and Controls Technical Challenges, Recent Research and Software Tools
Creators: M. Dubarry
A. Benson
D. Copp
Publisher: name: IEEE
Year: 2022

As  the  electric  grid  is  rapidly  transforming  to  be  more renewable and distributed, there are significant technical issues imposed  on  the  grid  due  to  the  highly  variable  renewable generation (e.g., wind and solar). Furthermore, the increasing threats of natural disasters and cyber/physical attacks have created a significant need to improve the resilience and reliability of  current  grid  infrastructure.  Grid energy storage  systems (ESSs) can be a flexible grid asset that can help mitigate those issues by providing multiple services to grid operators,  utilities,  and  end  users. Even though the application space for grid energy storage has grown rapidly over the last few years, there are multiple technical challenges that need to be addressed in order to further facilitate the incorporation of ESSs in the grid. Therefore, this panel gathers experts around the globe in energy storage field. The panel will provide the audience an overview on emerging challenges, recent research, and software tools in energy storage analytics and control area.  The information provided in this panel will benefit not only the industry but also other key stake holders such as policy makers, project developers and researchers in this area.
As  the  electric  grid  is  rapidly  transforming  to  be  more renewable and distributed, there are significant technical issues imposed  on  the  grid  due  to  the  highly  variable  renewable generation (e.g., wind and solar). Furthermore, the increasing threats of natural disasters and cyber/physical attacks have created a significant need to improve the resilience and reliability of  current  grid  infrastructure.  Grid energy storage  systems (ESSs) can be a flexible grid asset that can help mitigate those issues by providing multiple services to grid operators,  utilities,  and  end  users. Even though the application space for grid energy storage has grown rapidly over the last few years, there are multiple technical challenges that need to be addressed in order to further facilitate the incorporation of ESSs in the grid. Therefore, this panel gathers experts around the globe in energy storage field. The panel will provide the audience an overview on emerging challenges, recent research, and software tools in energy storage analytics and control area.  The information provided in this panel will benefit not only the industry but also other key stake holders such as policy makers, project developers and researchers in this area.
Cars Meet Grid
Creators: P. Krein
Publisher: name: IEEE
Year: 2022

The shift to electric transportation while welcomed in many respects, presents a number of challenges which cannot be underestimated.  Among them are:  the impact on the grid in general;  regulations and standards;  and, the right mix of slow and fast charging.  The panel will focus mostly on the charging interface between vehicles and grids, examine the technical challenges around fast charging, explore the proper mix of high-power and slow charging, and also look at possible gaps in standards around these technologies.  The main area of discussion will be around personal transportation, which may well ultimately constitute the bulk (in terms of aggregate energy) of the electric need.  It is also an area where there is less clarity on how drivers will end up charging their cars, as opposed to vehicles in other sectors with more predictable routes and needs.
The shift to electric transportation while welcomed in many respects, presents a number of challenges which cannot be underestimated.  Among them are:  the impact on the grid in general;  regulations and standards;  and, the right mix of slow and fast charging.  The panel will focus mostly on the charging interface between vehicles and grids, examine the technical challenges around fast charging, explore the proper mix of high-power and slow charging, and also look at possible gaps in standards around these technologies.  The main area of discussion will be around personal transportation, which may well ultimately constitute the bulk (in terms of aggregate energy) of the electric need.  It is also an area where there is less clarity on how drivers will end up charging their cars, as opposed to vehicles in other sectors with more predictable routes and needs.
Energy Storage Integration - Industry Lessons Learned
Creators: S. Willard
A. Patrick
Publisher: name: IEEE
Year: 2022

Cost effective and reliable energy storage is dependent not only on efficient capital costs and operations but also on efficient integration of storage to the grid.  This panel will  provide the audience an overview of integration field experiences, gaps exposed and solutions and pre planning steps needed to ensure the commissioning and overall integration of storage can be manifested efficiently. The information provided in this panel will benefit not only the industry but also other key stake holders such as policy makers, project developers and researchers in this area.
Cost effective and reliable energy storage is dependent not only on efficient capital costs and operations but also on efficient integration of storage to the grid.  This panel will  provide the audience an overview of integration field experiences, gaps exposed and solutions and pre planning steps needed to ensure the commissioning and overall integration of storage can be manifested efficiently. The information provided in this panel will benefit not only the industry but also other key stake holders such as policy makers, project developers and researchers in this area.
Ensuring Nation’s Energy Efficiency Through CVR Standardization
Creators: A. Saber
H. Chun
E. Gupta
Publisher: name: IEEE
Year: 2022

Conservation voltage reduction (CVR) is a cost?effective way to deliver energy efficiency benefits to customers. However, the measurement and verification of CVR benefits is challenging and lacks a standard procedure. A CVR standard will provide specific guidance on CVR measurement and verification by providing data management practices. A standard will further assist electric utilities in determining the true value of their CVR efforts, provide support in regulatory reporting, and provide an established method of verification methodology selection based on the data collection practices. This panel brings together subject matter experts from multiple utilities and technology providers across the US to provide a practical perspective into some of these challenges and the need for a standard. The panelists will further share their experiences with practical CVR programs as well as IEEE efforts in developing a CVR measurement and verification standard.
Conservation voltage reduction (CVR) is a cost?effective way to deliver energy efficiency benefits to customers. However, the measurement and verification of CVR benefits is challenging and lacks a standard procedure. A CVR standard will provide specific guidance on CVR measurement and verification by providing data management practices. A standard will further assist electric utilities in determining the true value of their CVR efforts, provide support in regulatory reporting, and provide an established method of verification methodology selection based on the data collection practices. This panel brings together subject matter experts from multiple utilities and technology providers across the US to provide a practical perspective into some of these challenges and the need for a standard. The panelists will further share their experiences with practical CVR programs as well as IEEE efforts in developing a CVR measurement and verification standard.
Method of wave equations exact solutions in studies of neutrinos and electrons interaction in dense matter
Creators: name: Studenikin, Alexander
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present quite a powerful method in investigations of different phenomena that can appear when neutrinos and electrons propagate in background matter. This method implies use of exact solutions of modified Dirac equations that contain the correspondent effective potentials accounting for the matter influence on particles. For several particular cases the exact solutions of modified Dirac and Dirac-Pauli equations for a neutrino and an electron in the background environment of different composition are obtained (the case of magnetized matter is also considered). Neutrino reflection, trapping, neutrino pair creation and annihilation in matter and neutrino energy quantization in a rotating medium are discussed. The neutrino Green functions in matter are also derived. The two recently proposed mechanisms of electromagnetic radiation by a neutrino and an electron in matter (the spin light of neutrino and electron, $SLν$ and $SLe$) are considered. A possibility to introduce an effective "matter-induced Lorentz force" acting on a neutrino and an electron is discussed. A new mechanism of electromagnetic radiation that can be emitted by an electron moving in the neutrino background with non-zero gradient of density is predicted.
description: 17 pages, 2 figures, invited talk at the Workshop on Quantum Field Theory under the Influence of Extrenal Conditions (QFEXT'07), Univ. of Leipzig, September 17-21, 2007
Minimum entropy production effect on a quantum scale
Creators: name: Márkus, Ferenc
name: Gambár, Katalin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Discovery of quantized electric conductance by the group of van Wees in 1988 was a major breakthrough in physics. Later, the group of Schwab has proven the existence of quantized thermal conductance. Advancing one step further, we present that quantized entropy current can be interpreted and it ease the description of a transferred quantized energy package. This might yield a universal transport behavior of the microscopic world. During the transfer of a single energy quantum, $h ν$ between two neighboring domains the minimum entropy increment is calculated. Furthermore, the possible existence of the minimum entropy production can be formulated.
Analytic results on long distance entanglement mediated by gapped spin chains
Creators: name: Ferreira, A.
name: Santos, J. M. B. Lopes dos
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We give an analytical description of long distance entanglement (LDE) mediated by one-dimensional quantum spin chains recently found in numerical studies. We develop a formalism that allows the computation of LDE for weakly interacting probes with gapped many-body systems. At zero temperature, a DC response function determines the ability of the physical system to generate genuine quantum correlations between the probes. We show that the biquadratic Heisenberg spin-1 chain is able to produce LDE in the thermodynamical limit and that the finite antiferromagnetic Heisenberg chain maximally entangles two spin-1/2 probes very far apart. These results support the current perspective of using quantum spin chains as entanglers or quantum channels in quantum information devices.
description: 4 pages, 2 figures, submitted for publication
On The Local Well-Posedness for Some Systems of Coupled KdV Equations
Creators: name: Alvarez-Samaniego, Borys
name: Carvajal, Xavier
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35A07, 35Q53

description: Using the theory developed by Kenig, Ponce, and Vega, we prove that the Hirota-Satsuma system is locally well-posed in Sobolev spaces $H^s(\mathbb{R}) \times H^{s}(\mathbb{R})$ for $3/4-3/4$, by establishing new mixed-bilinear estimates involving the two Bourgain-type spaces $X_{s,b}^{-α_-}$ and $X_{s,b}^{-α_+}$ adapted to $\partial_t+α_-\partial_x^3$ and $\partial_t+α_+\partial_x^3$ respectively, where $|α_+|=|α_-|\not = 0$.
description: 26 pages
Multipole Formulae for Gravitational Lensing Shear and Flexion
Creators: name: Bernstein, Gary M.
name: Nakajima, Reiko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The gravitational lensing equations for convergence, potential, shear, and flexion are simple in polar coordinates and separate under a multipole expansion once the shear and flexion spinors are rotated into a ``tangential'' basis. We use this to investigate whether the useful monopole aperture-mass shear formulae generalize to all multipoles and to flexions. We re-derive the result of Schneider and Bartelmann that the shear multipole m at radius R is completely determined by the mass multipole at R, plus specific moments Q^m_in and Q^m_out of the mass multipoles internal and external, respectively, to R. The m>=0 multipoles are independent of Q_out. But in contrast to the monopole, the m<0 multipoles are independent of Q_in. These internal and external mass moments can be determined by shear (and/or flexion) data on the complementary portion of the plane, which has practical implications for lens modelling. We find that the ease of E/B separation in the monopole aperture moments does {\em not} generalize to m!=0: the internal monopole moment is the {\em only} non-local E/B discriminant available from lensing observations. We have also not found practical local E/B discriminants beyond the monopole, though they could exist. We show also that the use of weak-lensing data to constrain a constant shear term near a strong-lensing system is impractical without strong prior constraints on the neighboring mass distribution.
description: 12 pages, no helpful figures; submitted to ApJ
WIMP Dark Matter Hidden behind its Companion
Creators: name: Guo, Jun
name: Kang, Zhaofeng
name: Zhang, Peng
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The WIMP dark matter (DM) hypothesis now is in an awkward position, owing to the stronger and stronger exclusion from DM direct detection. In this article we design a mechanism to evade this constraint.The idea is simple. DM has a companion, and they are both charged under the DM protecting symmetry G; they admit the trilinear coupling DM-DM-companion, so the latter provides a portal to the standard model (SM) via, for instance, the coupling to Higgs doublet.Then, DM semi-annihilates into the companion to arrive correct relic density, without leaving DM-nucleon scattering signal. The idea can be realized for ZN symmetric models with N >2.We stress that this mechanism has the characteristics of co-annihilation, and as a matter of fact its effect becomes necessary near or above the TeV region. This means that it may be difficult to detect our dark matter directly or indirectly.
description: 15 pages, 8 figures
Behind-The-Meter Distributed Energy Resources Visibility and Control
Creators: S. Howerter
F. Ding
B. Yang
K. Baker
Publisher: name: IEEE
Year: 2022

The distribution systems have been witnessing increased penetration of behind the meter distributed energy resources (DERs), such as solar PV, battery energy storage, EV, etc. Due to the lack of visibility of these DERs, it is becoming challenging to fully harness their flexibilities and potentials for grid benefits. This panel will discuss the most recent progress on behind the meter DERs visibility and developments of techniques for controlling these for grid services, such as voltage and frequency regulation, resiliency.
The distribution systems have been witnessing increased penetration of behind the meter distributed energy resources (DERs), such as solar PV, battery energy storage, EV, etc. Due to the lack of visibility of these DERs, it is becoming challenging to fully harness their flexibilities and potentials for grid benefits. This panel will discuss the most recent progress on behind the meter DERs visibility and developments of techniques for controlling these for grid services, such as voltage and frequency regulation, resiliency.
Radio Halo of NGC 4631: Comparing Observations and Simulations
Creators: name: Vijayan, Aditi
name: Dwarakanath, K. S.
name: Nath, Biman B.
name: Kale, Ruta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present low frequency observations at $315$ and $745$ MHz from the upgraded Giant Metrewave Radio Telescope (uGMRT) of the edge-on, nearby galaxy NGC $4631$. We compare the observed surface brightness profiles along the minor axis of the galaxy with those obtained from hydrodynamical simulations of galactic outflows. These are 3D simulations that replicate star-formation in a Milky-Way mass galaxy and follow magnetized outflows emerging from the disk. We detect a plateau-like feature in the observed emission at a height of $2-3$ kpc from the mid-plane of the galaxy, in qualitative agreement with that expected from simulations. This feature is believed to be due to the compression of magnetic fields behind the outer shocks of galactic outflows. We model the observed surface brightness profiles by assuming an exponential as well as a Gaussian fitting model. Using $χ^2$ statistics, we find that the exponential model fits the profiles better and we use it to determine the scale heights. We estimate the scale height for the synchrotron radio emission to be $\sim 1$ kpc. The timescales for advection due to outflows and diffusion of cosmic ray electrons are $\gtrsim 5$ and $\sim 160$ Myr, respectively. Because advection acts on a timescale much shorter than diffusion, we conclude that in NGC $4631$ advection, rather than diffusion, plays the dominant role in the formation of radio halo. The spectral index image with regions of flatter radio spectral index in the halo appears to indicate possible effects of gas outflow from the plane of the galaxy.
description: 9 Pages, 9 Figures, accepted for publication in MNRAS
Brown-York Energy and Radial Geodesics
Creators: name: Blau, Matthias
name: Rollier, Blaise
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compare the Brown-York (BY) and the standard Misner-Sharp (MS) quasilocal energies for round spheres in spherically symmetric space-times from the point of view of radial geodesics. In particular, we show that the relation between the BY and MS energies is precisely analogous to that between the (relativistic) energy E of a geodesic and the effective (Newtonian) energy E_{eff} appearing in the geodesic equation, thus shedding some light on the relation between the two. Moreover, for Schwarzschild-like metrics we establish a general relationship between the BY energy and the geodesic effective potential which explains and generalises the recently observed connection between negative BY energy and the repulsive behaviour of geodesics in the Reissner-Nordstrom metric. We also comment on the extension of this connection between geodesics and the quasilocal BY energy to regions inside a horizon.
description: v3: 7 pages, shortened and revised version to appear in CQG
Additional file 3 of Core set of unfavorable events of proximal humerus fracture treatment defined by an international Delphi consensus process
Creators: name: Audigé, Laurent
name: Brorson, Stig
name: Durchholz, Holger
name: Lambert, Simon
name: Moro, Fabrizio
name: Joeris, Alexander
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 3. PHF Core Event Set v1.0 - Delphi 02 survey screenshots.
Use of stochastic sources for the lattice determination of light quark physics
Creators: name: Boyle, P. A.
name: Juttner, A.
name: Kelly, C.
name: Kenway, R. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this paper we investigate the benefits of using Z(2)xZ(2) single timeslice stochastic sources for the calculation of light quark physics on the lattice. Meson 2-point correlators measured using sources stochastic in only spin and those stochastic in both spin and colour indices are compared to point source correlators on the unit gauge and on a 16^3 x 32 Domain Wall QCD ensemble. It is found that the use of stochastic sources gives a considerable improvement in statistics for the same computational cost. The neutral kaon mixing matrix element B_K is also calculated on this ensemble with stochastic sources, but we conclude that the stochastic method offers no significant advantage over the traditional gauge-fixed wall source approach which already offers an exact volume average. We also discuss the application to semileptonic form factors in conjunction with partially twisted boundary conditions.
description: 26 pages, 7 figures. Version accepted by JHEP
Additional file 4 of Core set of unfavorable events of proximal humerus fracture treatment defined by an international Delphi consensus process
Creators: name: Audigé, Laurent
name: Brorson, Stig
name: Durchholz, Holger
name: Lambert, Simon
name: Moro, Fabrizio
name: Joeris, Alexander
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 4. PHF CES Consensus Panel (231 participants in alphabetical order).
Hardy spaces on homogeneous trees with flow measures
Creators: name: Santagati, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 05C05, 05C21, 30H10, 35K08, 42B25, 43A99

description: We consider a homogeneous tree endowed with a nondoubling flow measure $μ$ of exponential growth and a probabilistic Laplacian $\mathcal{L}$ self-adjoint with respect to $μ$. We prove that the maximal characterization in terms of the heat and the Poisson semigroup of $\mathcal{L}$ and the Riesz transform characterization of the atomic Hardy space introduced in a previous work fail.
description: 24 pages
Event Characterization Using Synchrophasor Big Data
Creators: Y. Liu
Y. Hu
N. Nayak
M. Kezunovic
Publisher: name: IEEE
Year: 2022

Synchrophasor systems have been installed in the US power grid in large numbers over the last 10-15 years and the amount of recorded data is growing exponentially as the PMUs, as well as protective relays, digital fault recorders and other PMU-enabled devices are being added. The amount of recoded data may exceed hundreds of terabytes for a single utility, and is growing every day.   Handling of such large amounts of data requires careful considerations of the possible uses of such data, which leads to the requirements for automated means of processing synchrophasor big data files. This panel addresses the task of implementing machine learning and artificial intelligence methods on synchrophasor data for the purpose of developing data models for automatically characterizing power system events. The panelists have first-hand experience with such developments from extensive involvements with the projects aimed at collecting, managing and processing synchrophasor big data. They will share their experiences with the goal of informing the professional communities about the benefits and challenges of implementing the big data analytics. Suh experiences are pointing to many pitfalls of existing practices and suggesting improvements in future synchrophasor big data wrangling, processing and visualization.
Synchrophasor systems have been installed in the US power grid in large numbers over the last 10-15 years and the amount of recorded data is growing exponentially as the PMUs, as well as protective relays, digital fault recorders and other PMU-enabled devices are being added. The amount of recoded data may exceed hundreds of terabytes for a single utility, and is growing every day.   Handling of such large amounts of data requires careful considerations of the possible uses of such data, which leads to the requirements for automated means of processing synchrophasor big data files. This panel addresses the task of implementing machine learning and artificial intelligence methods on synchrophasor data for the purpose of developing data models for automatically characterizing power system events. The panelists have first-hand experience with such developments from extensive involvements with the projects aimed at collecting, managing and processing synchrophasor big data. They will share their experiences with the goal of informing the professional communities about the benefits and challenges of implementing the big data analytics. Suh experiences are pointing to many pitfalls of existing practices and suggesting improvements in future synchrophasor big data wrangling, processing and visualization.
Additional file 5 of Core set of unfavorable events of proximal humerus fracture treatment defined by an international Delphi consensus process
Creators: name: Audigé, Laurent
name: Brorson, Stig
name: Durchholz, Holger
name: Lambert, Simon
name: Moro, Fabrizio
name: Joeris, Alexander
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 5. PHF Core Event Set v1.0 - Delphi 01 survey results – July 2019.
A Note on Conserved Charges of Asymptotically Flat and Anti-de Sitter Spaces in Arbitrary Dimensions
Creators: name: Jamsin, Ella
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The calculation of conserved charges of black holes is a rich problem, for which many methods are known. Until recently, there was some controversy on the proper definition of conserved charges in asymptotically anti-de Sitter (AdS) spaces in arbitrary dimensions. This paper provides a systematic and explicit Hamiltonian derivation of the energy and the angular momenta of both asymptotically flat and asymptotically AdS spacetimes in any dimension D bigger or equal to 4. This requires as a first step a precise determination of the asymptotic conditions of the metric and of its conjugate momentum. These conditions happen to be achieved in ellipsoidal coordinates adapted to the rotating solutions.The asymptotic symmetry algebra is found to be isomorphic either to the Poincare algebra or to the so(D-1, 2) algebra, as expected. In the asymptotically flat case, the boundary conditions involve a generalization of the parity conditions, introduced by Regge and Teitelboim, which are necessary to make the angular momenta finite. The charges are explicitly computed for Kerr and Kerr-AdS black holes for arbitrary D and they are shown to be in agreement with thermodynamical arguments.
description: 27 pages; v2 : references added, minor corrections; v3 : replaced to match published version forthcoming in General Relativity and Gravitation
Pseudorientalia natolica
Creators: name: Odabaşi, Deniz Anil
name: Mercan, Deniz
name: Odabaşi, Serpil
name: Arslan, Naime
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Hydrobiidae
Pseudorientalia
Pseudorientalia natolica

description: Pseudorientalia natolica (Küster, 1853)
Topotype specimens: Twenty seven shells of P. natolica from type locality, leg. Deniz Anıl Odabaşı on 22 nd of May 2021 deposited in COMULM (G–251), were measured and 5 of them were cracked to reveal of the soft parts’ morphology including penis and female genitalia. Some of the mean values of shell morphometry as follows: SH = 1.6 mm, SW = 1.28 mm, AH = 0.89 mm, AW = 0.79 mm, BWH = 1.28 mm, BWW = 1.04 mm (Table 2).
Notes on morphology: Shell ovoid-conical with 3½–4 tumid whorls, body whorl massive, spire low, sutures deep, aperture ovoid – angled at the top, umbilicus slit-like (Fig. 5–A, Table 2). Penis awl-like with rather broad base tapering to the tip, black pigmented in the middle (Fig. 5–D, E). Head and tentacles dark black pigmented (Fig. 5–B). Female genitalia unpigmented, bursa copulatrix flattened circular and covering half of the gland complex, renal oviduct strongly looped with two seminal receptacles: rs-1 very weak, rs-2 short but massive (Fig. 5–F).
description: Published as part of Odabaşi, Deniz Anil, Mercan, Deniz, Odabaşi, Serpil & Arslan, Naime, 2024, A new species of Pseudorientalia (Gastropoda: Hydrobiidae) from midwestern Türkiye with notes on Pseudorientalia natolica (Küster, 1853), pp. 585-592 in Zootaxa 5415 (4) on page 590, DOI: 10.11646/zootaxa.5415.4.8, http://zenodo.org/record/10695729
Strength of effective Coulomb interaction in two-dimensional transition-metal Halides MX$_2$ and MX$_3$ (M=Ti, V, Cr, Mn, Fe, Co, Ni; X=Cl, Br, I)
Creators: name: Yekta, Y.
name: Hadipour, H.
name: Sasioglu, E.
name: Friedrich, C.
name: Jafari, S. A.
name: Bluegel, S.
name: Mertig, I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We calculate the strength of the effective onsite Coulomb interaction (Hubbard $U$) in two-dimensional (2D) transition-metal (TM) dihalides MX$_2$ and trihalides MX$_3$ (M=Ti, V, Cr, Mn, Fe, Co, Ni; X=Cl, Br, I) from first principles using the constrained random-phase approximation. The correlated subspaces are formed from $t_{2g}$ or $e_g$ bands at the Fermi energy. Elimination of the efficient screening taking place in these narrow bands gives rise to sizable interaction parameters U between the localized $t_{2g}$ ($e_g$) electrons. Due to this large Coulomb interaction, we find $U/W >1$ (with the band width $W$) in most TM halides, making them strongly correlated materials. Among the metallic TM halides in paramagnetic state, the correlation strength $U/W$ reaches a maximum in NiX$_2$ and CrX$_3$ with values much larger than the corresponding values in elementary TMs and other TM compounds. Based on the Stoner model and the calculated $U$ and $J$ values, we discuss the tendency of the electron spins to order ferromagnetically.
Detection of Magnetic Massive Stars in the Open Cluster NGC 3766
Creators: name: McSwain, M. Virginia
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A growing number of observations indicate that magnetic fields are present among a small fraction of massive O- and B-type stars, yet the origin of these fields remains unclear. Here we present the results of a VLT/FORS1 spectropolarimetric survey of 15 B-type members of the open cluster NGC 3766. We have detected two magnetic B stars in the cluster, including one with a large field of nearly 2 kG, and we find marginal detections of two additional stars. There is no correlation between the observed longitudinal field strengths and the projected rotational velocity, suggesting that a dynamo origin for the fields is unlikely. We also use the Oblique Dipole Rotator model to simulate populations of magnetic stars with uniform or slightly varying magnetic flux on the ZAMS. None of the models successfully reproduces our observed range in B_l and the expected number of field detections, and we rule out a purely fossil origin for the observed fields.
description: 6 pages ApJ emulate style; accepted to ApJ
Designing HVDC Transmission Overlay Networks for a High-Renewables Future
Creators: J. McCalley
H. Xiao
K. Sun
Publisher: name: IEEE
Year: 2022

This panel session will discuss design and planning aspects of HVDC overlay networks in high-renewables future. The discussion topics will include technical concepts, design principles and functional requirements of HVDC grid systems; staged developmen of national-level HVDC transmission networks; progress of meshed HVDC offshore transmission networks; HVDC transmission schemes combining the benefits of both LCC and VSC technologies; and system studies for planning HVDC overlay networks.
This panel session will discuss design and planning aspects of HVDC overlay networks in high-renewables future. The discussion topics will include technical concepts, design principles and functional requirements of HVDC grid systems; staged developmen of national-level HVDC transmission networks; progress of meshed HVDC offshore transmission networks; HVDC transmission schemes combining the benefits of both LCC and VSC technologies; and system studies for planning HVDC overlay networks.
Isolation and characterization of mouse-human somatic cell hybrids which produce a leukemia associated antigen
Creators: name: Lum, Vincent Lawrence
Publisher: name: University of British Columbia
Year: 2010

description: Interspeci fic somatic cell hybridisation has the potential not only of producing hybrids expressing antigens o-f two different species but also of providing genetic information on these foreign antigens. The work presented here, describes the successful interspecific somatic cell hybridisation of a mouse myeloid cell line (WeHi-TG) with peripheral blood leukocytes from a patient with chronic granulocytic leukemia. Hybrid fusion products were screened for their ability to produce a leukemia associated protein (CAMAL) as detected by indirect immunoperoxidase as well as ELISA using a monoclonal antibody specific for CAMAL. Production of this antigen was verified by immunoprecipitation of internally labelled cell lysates from these hybridomas. CAMAL-producing cell hybrids were further tested for the prescence of human DNA, using the BLUR 8 "Alu" containing DNA probe and a panel of monoclonal antibodies with specificities to a variety of myeloid antigens. These studies confirmed the prescence of human DNA and showed some correlation between cells producing CAMAL and those expressing other granulocyte markers. Karyotype analysis was carried out on hybridoma lines after long term culture. In all hybrids examined, no recognizable human chromosomes or translocations were detected using either the methods of G-banding or differential G-ll staining. The development of an in vivo animal model for human leukemia would provide a mammalian system for the testing of various cancer therapies. The ability of our CAMAL expressing hybrids to grow in BALB/C mice provided the rationale for the development of an animal model for cancer therapy. Our preliminary in vitro results showed that CAMAL expressing hybrids could be specifically eliminated using hematoporphyrin conjugated to CAMAL-1.
A comparative study for the pair-creation contact process using series expansions
Creators: name: Fiore, C. E.
name: Dantas, W. G.
name: de Oliveira, M. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A comparative study between two distinct perturbative series expansions for the pair-creation contact process is presented. In contrast to the ordinary contact process, whose supercritical series expansions provide accurate estimates for its critical behavior, the supercritical approach does not work properly when applied to the pair-creation process. To circumvent this problem a procedure is introduced in which one-site creation is added to the pair-creation. An alternative method is the generation of subcritical series expansions which works even for the case of the pure pair-creation process. Differently from the supercritical case, the subcritical series yields estimates that are compatible with numerical simulations.
Tool and Metrics for Microgrid Design and Evaluation
Creators: V. Venkataramanan
P. Sarker
S. Sadanandan
A. Srivastava
Publisher: name: IEEE
Year: 2022

Recent advancement in tools has helped with microgrid design, development, planning and operation.  Microgrids offer a unique application based on users with different requirements for tools. The process of designing, constructing, commissioning, and assessing a microgrid is not always straightforward due to these distinct requirements.  Additionally, metrics are needed for performance evaluation. This panel will offer an overview and description of tools that helps with microgrid design, construction, planning, operation, cyber security, and metrics-driven performance assessment driven by multiple diverse applications and use cases.
Recent advancement in tools has helped with microgrid design, development, planning and operation.  Microgrids offer a unique application based on users with different requirements for tools. The process of designing, constructing, commissioning, and assessing a microgrid is not always straightforward due to these distinct requirements.  Additionally, metrics are needed for performance evaluation. This panel will offer an overview and description of tools that helps with microgrid design, construction, planning, operation, cyber security, and metrics-driven performance assessment driven by multiple diverse applications and use cases.
Situational awareness and decision support for power grid operators during extreme events
Creators: Z. Dong
L. Lai
A. Vaccaro
F. DeCaro
C. Sing Lai
Publisher: name: IEEE
Year: 2022

Energy consumption and electricity load are a true reflection of the socio-economic health of a city. Various techniques for data analytics for the mass amount of data from smart grid to support decision making for the government to effectively reduce operating costs and improve the operational efficiency of smart city will be one of the big issues. Decision-makers must be fully aware of the potential of the smart grid so that the smart Infrastructure can play an important role. It is expected that with the continuous advancement of technology, smart grid and smart city construction will mutually promote and facilitate each other. The speakers will present recent work on standards, recommendations and guidelines applied or have huge potential to the smart grid for smart city application worldwide, such as the IEEE 2814 Recommended Practices on Techno-economic Metrics Standard for Hybrid Energy and Storage Systems.
Energy consumption and electricity load are a true reflection of the socio-economic health of a city. Various techniques for data analytics for the mass amount of data from smart grid to support decision making for the government to effectively reduce operating costs and improve the operational efficiency of smart city will be one of the big issues. Decision-makers must be fully aware of the potential of the smart grid so that the smart Infrastructure can play an important role. It is expected that with the continuous advancement of technology, smart grid and smart city construction will mutually promote and facilitate each other. The speakers will present recent work on standards, recommendations and guidelines applied or have huge potential to the smart grid for smart city application worldwide, such as the IEEE 2814 Recommended Practices on Techno-economic Metrics Standard for Hybrid Energy and Storage Systems.
The Role of Grid Technologies in Responding to Climate Change
Creators: G. Gonzalez
J. Schlegelmilch
Publisher: name: IEEE
Year: 2022

Effectively integrating clean energy technologies is a necessary element of the strategy to mitigate and adapt to the realities of climate change. Grid technologies that enable the wide-scale adoption of zero-emission generation, as well as electrified use-cases for transportation to manufacturing are helping drive policy discussions and decisions across the world. This panel will explore case studies and examples of how power systems technologies, from microgrids to market mechanisms, are helping not only directly reduce the carbon footprint of communities and support the resiliency of the grid and those who rely upon it, but are also encouraging a larger conversation about the role of grid technologies in promoting sustainability and resiliency equitably.
Effectively integrating clean energy technologies is a necessary element of the strategy to mitigate and adapt to the realities of climate change. Grid technologies that enable the wide-scale adoption of zero-emission generation, as well as electrified use-cases for transportation to manufacturing are helping drive policy discussions and decisions across the world. This panel will explore case studies and examples of how power systems technologies, from microgrids to market mechanisms, are helping not only directly reduce the carbon footprint of communities and support the resiliency of the grid and those who rely upon it, but are also encouraging a larger conversation about the role of grid technologies in promoting sustainability and resiliency equitably.
Scaling and commensurate-incommensurate crossover for the d=2, z=2 quantum critical point of itinerant antiferromagnets
Creators: name: Roy, Sébastien
name: Tremblay, A. -M. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Quantum critical points exist at zero temperature, yet, experimentally their influence seems to extend over a large part of the phase diagram of systems such as heavy-fermion compounds and high-temperature superconductors. Theoretically, however, it is generally not known over what range of parameters the physics is governed by the quantum critical point. We answer this question for the spin-density wave to fermi-liquid quantum critical point in the two-dimensional Hubbard model. This problem is in the $d=2,z=2$ universality class. We use the Two-Particle Self-Consistent approach, which is accurate from weak to intermediate coupling, and whose critical behavior is the same as for the self-consistent-renormalized approach of Moriya. Despite the presence of logarithmic corrections, numerical results demonstrate that quantum critical scaling for the static magnetic susceptibility can extend up to very high temperatures but that the commensurate to incommensurate crossover leads to deviations to scaling.
description: Unchanged numerical results. It is now shown analytically that the approach includes logarithmic corrections and that the critical behavior is equivalent to the theory of Moriya. 6 pages, 3 figures, LateX
Multi-dimensional Numerical Scheme for Resistive Relativistic MHD
Creators: name: Komissarov, S. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The paper describes a new upwind conservative numerical scheme for special relativistic resistive magnetohydrodynamics with scalar resistivity. The magnetic field is kept approximately divergence free and the divergence of the electric field consistent with the electric charge distribution via the method of Generalized Lagrange Multiplier. The hyperbolic fluxes are computed using the HLL prescription and the source terms are accounted via the time-splitting technique. The results of test simulations show that the scheme can handle equally well both resistive current sheets and shock waves and thus can be a useful tool for studying phenomena of relativistic astrophysics that involve both colliding supersonic flows and magnetic reconnection.
description: submitted to MNRAS