cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Green-Schwarz superstring on the lattice
Creators: name: Bianchi, Lorenzo
name: Bianchi, Marco S.
name: Forini, Valentina
name: Leder, Björn
name: Vescovi, Edoardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We consider possible discretizations for a gauge-fixed Green-Schwarz action of Type IIB superstring. We use them for measuring the action, from which we extract the cusp anomalous dimension of planar $\mathcal{N}=4$ SYM as derived from AdS/CFT, as well as the mass of the two $AdS$ excitations transverse to the relevant null cusp classical string solution. We perform lattice simulations employing a Rational Hybrid Monte Carlo (RHMC) algorithm and two Wilson-like fermion discretizations, one of which preserves the global $SO(6)$ symmetry of the model. We compare our results with the expected behavior at various values of $g=\frac{\sqrtλ}{4π}$. For both the observables, we find a good agreement for large $g$, which is the perturbative regime of the sigma-model. For smaller values of $g$, the expectation value of the action exhibits a deviation compatible with the presence of quadratic divergences. After their non-perturbative subtraction the continuum limit can be taken, and suggests a qualitative agreement with the non-perturbative expectation from AdS/CFT. Furthermore, we detect a phase in the fermion determinant, whose origin we explain, that for very small $g$ leads to a sign problem not treatable via standard reweigthing. The continuum extrapolations of the observables in the two different discretizations agree within errors, which is strongly suggesting that they lead to the same continuum limit. Part of the results discussed here were presented earlier in arXiv:1601.04670.
description: 33 pages, 14 figures, 2 Tables. Text overlap with the Conference Proceedings where some preliminary results were presented, arXiv:1601.04670v1
Letter from Kathleen Raine to John Betjeman, April 03, [1972?-1973?]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Poets laureate
valueUri: http://id.worldcat.org/fast/1067788
subject: Broadcasters
valueUri: http://id.worldcat.org/fast/839184
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Journalists
valueUri: http://id.worldcat.org/fast/984188
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Betjeman, John, 1906-1984
valueUri: http://id.worldcat.org/fast/1427507
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064

description: Correspondence between John Betjeman and Kathleen Raine. Raine was awarded the Queen’s Gold Medal for Poetry in 1992. In addition to poetry she completed scholarly work on William Blake and W. B. Yeats, and co-founded the Temenos literary journal and later the Temenos Academy of Integral Studies. In this letter, Raine writes about titles and asks Betjeman to write a letter of recommendation for Peter Russell to Robin Skelton at the University of Victoria.
A Scaling Relation in Inhomogeneous Cosmology with k-essence scalar fields
Creators: name: Gangopadhyay, Debashis
name: Mukherjee, Somnath
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We obtain a scaling relation for spherically symmetric k-essence scalar fields $ϕ(r,t)$ for an inhomogeneous cosmology with the Lemaitre-Tolman- Bondi (LTB) metric. We show that this scaling relation reduces to the known relation for a homogeneous cosmology when the LTB metric reduces to the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric under certain identifications of the metric functions. A k-essence lagrangian is set up and the Euler-Lagrangian equations solved assuming $ϕ(r,t)=ϕ_{1}(r) + ϕ_{2}(t)$. The solutions enable the LBT metric functions to be related to the fields. The LTB inhomogeneous universe exhibits late time accelerated expansion i.e.cosmic acceleration driven by negative pressure.
description: 13 pages
Coverage gain and Device-to-Device user Density: Stochastic Geometry Modeling and Analysis
Creators: name: Mustafa, Hafiz Attaul
name: Shakir, Muhammad Zeeshan
name: Imran, Muhammad Ali
name: Imran, Ali
name: Tafazolli, Rahim
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Device-to-device (D2D) communication has huge potential for capacity and coverage enhancements for next generation cellular networks. The number of potential nodes for D2D communication is an important parameter that directly impacts the system capacity. In this paper, we derive analytic expression for average coverage probability of cellular user and corresponding number of potential D2D users. In this context, mature framework of stochastic geometry and Poisson point process has been used. The retention probability has been incorporated in Laplace functional to capture reduced path-loss and shortest distance criterion based D2D pairing. The numerical results show a close match between analytic expression and simulation setup.
description: 4 pages, 5 figures
Ultraheavy Element Enrichment in Impulsive Solar Flares
Creators: name: Eichler, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Particle acceleration by cascading Alfven wave turbulence was suggested (Eichler, 1979b) as being responsible for energetic particle populations in $^3$He-rich solar flares. In particular, it was noted that the damping of the turbulence by the tail of the particle distribution in rigidity naturally leads to dramatic enhancement of pre-accelerated species - as $^3$He is posited to be - and superheavy elements. The subsequent detection of large enrichment of ultraheavies, relative to iron, has apparently confirmed this prediction, lending support to the original idea. It is shown here that this picture could be somewhat sharpened by progress in understanding the 3-dimensional geometrical details of cascading Alfven turbulence (Sridhar and Goldreich, 1995). The mechanism may be relevant in other astrophysical environments where the source of turbulence is non-magnetic, such as clusters of galaxies.
description: published in the Astrophysical Journal
Evidence for galaxy dynamics tracing cosmological evolution
Creators: name: van Putten, Maurice
Publisher: name: Zenodo
Year: 2018

description: We identify C0 galaxy dynamics in data of Lellie et al. (2016) and Genzel et al. (2017) normalized to the de Sitter scale of acceleration adS=cH covering redshifts up to abou two. It shows dynamics tracing cosmological evolution governed by Lambda = omega_0^2 derived from the eigenfrequency omega_0 = sqrt(1-q)H of the cosmological horizon with Hubble parameter H and deceleration parameter q, derived from the Gauss-Bonnet theorem. An exact solution H(z) is presented, representing evanescent dark energy and dark matter from entanglement across the cosmological horizon.
description: Preferred citation: Self-similar galaxy dynamics below the de Sitter scale of acceleration, 2018, van Putten, M.H.P.M., MNRAS, 481, L26, https://doi.org/10.1093/mnrasl/sly149
First-principles derived complexion diagrams for phase boundaries in doped cemented carbides
Creators: name: Johansson, Sven A. E.
name: Wahnström, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This article reviews a method for calculating an equilibrium interfacial phase diagram depicting regions of stability for different interface structures as function of temperature and chemical potentials. Density functional theory (DFT) is used for interfacial energies, Monte Carlo simulations together with cluster expansions based on DFT results for obtaining configurational free energies, and CALPHAD-type modeling for describing the thermodynamic properties of the adjoining bulk phases. An explicit case, vanadium doped cemented carbides, is chosen to illustrate the progress in the research field and the interfacial diagram, a complexion diagram, for the phase boundary WC(0001)/Co is constructed as function of temperature and chemical potentials.
Chaotic and non-chaotic mixed oscillations in a logistic systems with delay
Creators: name: Berezowski, Marek
name: Grabski, Artur
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The paper deals with the theoretical analysis of a logistic system composed of at least two elements with distributed parameters. It has been shown that such a system may generate specific oscillations in spite of the fact that the solutions of the mathematical method are characterized by no dynamic bifurcations. It has also been shown that the time series of the state variables of such a system may behave in a semi-chaotic way. This means that they have then predictable and unpredictable fragments. The analysis has been illustrated by two examples, viz. of a simple logistic model and of a reactor with feedback.
description: 6 pages, 10 figures, published in the Chaos, Solitons and Fractals, Vol. 14, Issue 1, 2002
D7.1 AquaWind Dissemination and Communication Plan
Creators: name: Gubern, Teresa
name: Ventura, Tamara
name: Avagnina, Beatrice
name: Perello, Michelle
Publisher: name: Zenodo
Year: 2023

description: First version of the Dissemination and Communication Plan. The deliverable consists of a comprehensive plan to guide the communication and dissemination activities of the project.
Optimization of STIRAP-based state transfer under dissipation
Creators: name: Wang, Ying-Dan
name: Yan, Xiao-Bo
name: Chesi, Stefano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using a perturbative treatment, we quantify the influence of non-adiabatic leakage and system dissipation on the transfer fidelity of a stimulated Raman adiabatic passage (STIRAP) process. We find that, optimizing transfer time rather than coupling profiles, leads to a significant improvement of the transfer fidelity. The upper bound of the fidelity has been found as a simple analytical function of system cooperativities. We also provide a systematic approach to reach this upper bound efficiently.
description: 10 pages, 3 figures
Suppression of the accretion rate in thin discs around binary black holes
Creators: name: Ragusa, Enrico
name: Lodato, Giuseppe
name: Price, Daniel J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present three-dimensional Smoothed Particle Hydrodynamics (SPH) simulations investigating the dependence of the accretion rate on the disc thickness around an equal-mass, circular black hole binary system. We find that for thick/hot discs, with $H/R\gtrsim 0.1$, the binary torque does not prevent the gas from penetrating the cavity formed in the disc by the binary (in line with previous investigations). The situation drastically changes for thinner discs, in this case the mass accretion rate is suppressed, such that only a fraction (linearly dependent on $H/R$) of the available gas is able to flow within the cavity and accrete on to the binary. Extrapolating this result to the cold and thin accretion discs expected around supermassive black hole binary systems implies that this kind of systems accretes less material than predicted so far, with consequences not only for the electromagnetic and gravitational waves emissions during the late inspiral phase but also for the recoil speed of the black hole formed after binary coalescence, thus influencing also the evolutionary path both of the binary and of the host galaxy. Our results, being scale-free, are also applicable to equal mass, circular binaries of stellar mass black holes, such as the progenitor of the recently discovered gravitational wave source GW150914.
description: 12 pages, 6 figures, 2 tables, accepted for publication in MNRAS
Chemodynamic subpopulations of the Carina dwarf galaxy
Creators: name: Kordopatis, G.
name: Amorisco, N. C.
name: Evans, N. W.
name: Gilmore, G.
name: Koposov, S. E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the chemodynamical properties of the Carina dwarf spheroidal by combining an intermediate spectroscopic resolution dataset of more than 900 red giant and red clump stars, with high-precision photometry to derive the atmospheric parameters, metallicities and age estimates for our targets. Within the red giant branch population, we find evidence for the presence of three distinct stellar sub-populations with different metallicities, spatial distributions, kinematics and ages. As in the Fornax and Sculptor dwarf spheroidals, the subpopulation with the lowest average metallicity is more extended and kinematically hotter than all other populations. However, we identify an inversion in the parallel ordering of metallicity, kinematics and characteristic length scale in the two most metal rich subpopulations, which therefore do not contribute to a global negative chemical gradient. Contrary to common trends in the chemical properties with radius, the metal richest population is more extended and mildly kinematically hotter than the main component of intermediate metallicity. More investigations are required to ascertain the nature of this inversion, but we comment on the mechanisms that might have caused it.
description: 9 pages, 9 figures, accepted for publication in MNRAS
Ge clusters and wetting layers forming from granular films on the Si(001) surface
Creators: name: Storozhevykh, M. S.
name: Arapkina, L. V.
name: Yuryev, V. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The report studies transformation of a Ge granular film deposited at room temperature on the Si(001) surface to the Ge/Si(001) heterostructure as a result of rapid heating and annealing at 600C. As a result of the short-term annealing at 600C in conditions of a closed system, the Ge granular film transforms to the usual wetting layer and Ge clusters with multimodal size distribution and the Ge oval drops having the highest number density. After the long-term thermal treatment of the Ge film at the same temperature, Ge drops disappear; the large clusters increase their sizes at the expense of the smaller ones. The total density of Ge clusters on the surface drastically decreases. The wetting layer mixed c(4 x 2) + p(2 x 2) reconstruction transforms to the single c(4 x 2) one which is likely thermodynamically favoured. Pyramids or domes are not observed on the surface after any annealing.
description: A paper presented at the 17th Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics, 23-27 November 2015, St. Petersburg, Russia
Preparation of nickel nanoparticle composites for corrosion resistant coatings
Creators: name: Carty, Robert
Publisher: name: University of Limerick
Year: 2023
Subjects: subject: Engineering
subject: Chemical sciences
subject: FOS: Chemical sciences

description: Nickel – nanoalumina (50 to 100 nm size) composites have been electrodeposited using parallel plates from a Watt’s bath containing various particle loadings. Experiments have been conducted to examine the effect of surfactant addition, ionic strength, electrolyte additive addition, current type (Pulse versus Direct current), current density, duty cycle, frequency, agitation type (mechanical and ultrasonic) and mechanical agitation speed on particle incorporation. It was found that the best conditions for depositing coatings with non-agglomerated nano-alumina particles were pulse plating at a current density of 10 A.dm-2, with a duty cycle of 50 % and frequency of 1000 Hz from a HISA15S1 bath with 15 g.dm-3 Al2O3 loading and 1g.dm-3saccharin loading. These conditions produce a Nickel-nanoalumina composite containing 10 vol.% Al2O3 with a grain size in the order of 250 nm. The hardness of this coating is 6.3 GPa, Young’s modulus 221 GPa and wear resistance is improved by 60 %. The rest potential (Erest) in a 3.5wt % NaCl aqueous solution is -0.16 V compared with -0.26 V for a coating without nanoalumina particles. The nanocomposite coating had a life, before the first signs of corrosion, of 8 weeks when submerged in acidic 3.5 wt % NaCl solution.
Qualities-of-Teachers-in-Emergency-Times_-A-Brief-Overview-of-the-Coronavirus-Pandemic-and-Its-Impact-on-Education.pdf
Creators: name: Anakwue, Anthonia  Laetitia
Publisher: name: figshare
Year: 2023
Subjects: Education policy

description: Despite the spread of the pandemic, it was observed that schools sought alternative methods to engage students in learning activities during the lockdown. However, while some students were able to access quality education, others were not able to access it. This divergence in the quality of education received during the pandemic can be attributed to the quality of teachers. Hence, this chapter discussed the impact of teacher quality on education during emergency times. The discussion of the chapter was sectionalized in four sections. The study noted that during time of emergency, the quality of teachers shows a glaring disparity as teachers in low-income schools deliver poorer educational services than teachers of high?income schools. In conclusion, the study presented a way forwa
NIHAO VI. The hidden discs of simulated galaxies
Creators: name: Obreja, A.
name: Stinson, G. S.
name: Dutton, A. A.
name: Macciò, A. V.
name: Wang, L.
name: Kang, X.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Detailed studies of galaxy formation require clear definitions of the structural components of galaxies. Precisely defined components also enable better comparisons between observations and simulations. We use a subsample of eighteen cosmological zoom-in simulations from the NIHAO project to derive a robust method for defining stellar kinematic discs in galaxies. Our method uses Gaussian Mixture Models in a 3D space of dynamical variables. The NIHAO galaxies have the right stellar mass for their halo mass, and their angular momenta and Sérsic indices match observations. While the photometric disc-to-total ratios are close to 1 for all the simulated galaxies, the kinematic ratios are around ~0.5. Thus, exponential structure does not imply a cold kinematic disc. Above log(M*)~9.5, the decomposition leads to thin discs and spheroids that have clearly different properties, in terms of angular momentum, rotational support, ellipticity, [Fe/H] and [O/Fe]. At log(M*)<9.5, the decomposition selects discs and spheroids with less distinct properties. At these low masses, both the discs and spheroids have exponential profiles with high minor-to-major axes ratios, i.e. thickened discs.
description: Accepted for publication in MNRAS
Pair production in classical Stueckelberg-Horwitz-Piron electrodynamics
Creators: name: Land, Martin
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we calculate pair production from bremsstrahlung as a classical effect in Stueckelberg-Horwitz-Piron electrodynamics. In this framework, worldlines are traced out dynamically through the evolution of events $x^μ(τ)$ parameterized by a chronological time $τ$ that is independent of the spacetime coordinates. These events, defined in an unconstrained 8D phase space, interact through five $τ$-dependent gauge fields induced by the event evolution. The resulting theory differs in its underlying mechanics from conventional electromagnetism, but coincides with Maxwell theory in an equilibrium limit. In particular, the total mass-energy-momentum of particles and fields is conserved, but the mass-shell constraint is lifted from individual interacting events, so that the standard Feynman-Stueckelberg interpretation of pair creation/annihilation is implemented in classical mechanics.
CONSOLE_WP3_Task3.2_ Pan-EU survey of farmers and other rural landowners_FI_2022.11.03_v01_README
Creators: name: Haltia, Emmi
Publisher: name: Zenodo
Year: 2023

description: Data collected from the 409 Finnish farmers and 386 forests owners on their views on a result-based carbon compensation scheme. The data set contains the choice experiment data sets for forest owners (data sheet: CE data forest owners) and farmers (data sheet: CE data farmers) and the other survey data that can be linked to the CE data sets with the respondent ID numbers. Variable coding follows the coding reported in the MS Excel file “CodesQuestionsAndVariableCoding_2022.11.03.xlsx”.
Beyond 5G/6G EMF Considerations
Creators: name: Patsouras, Ioannis
name: Benn, Andrew
name: Fellan, Amina
name: Kosmatos, Evangelos
name: Mohr, Werner
name: Roosipuu, Priit
name: Verrios, Panayiotis
Publisher: name: Zenodo
Year: 2023

description: This document provides an overview of electromagnetic field (EMF) exposure topics related to wireless communications and in particular to beyond 5G and 6G systems. The relevant standards and effects are summarised; additionally, ideas on what and how to measure EMF effects are put forward as basis for further discussion and research. The available key performance indicators (KPIs) from the fifth generation Infrastructure Public Private Partnership (5G PPP) phase III projects with a focus on EMF are also consolidated with a view of how the KPIs are considered in the 5G system and how they may evolve in 6G systems.
A Comprehensive Dust Model Applied to the Resolved Beta Pictoris Debris Disk from Optical to Radio Wavelengths
Creators: name: Ballering, Nicholas P.
name: Su, Kate Y. L.
name: Rieke, George H.
name: Gaspar, Andras
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate whether varying the dust composition (described by the optical constants) can solve a persistent problem in debris disk modeling--the inability to fit the thermal emission without over-predicting the scattered light. We model five images of the beta Pictoris disk: two in scattered light from HST/STIS at 0.58 microns and HST/WFC3 at 1.16 microns, and three in thermal emission from Spitzer/MIPS at 24 microns, Herschel/PACS at 70 microns, and ALMA at 870 microns. The WFC3 and MIPS data are published here for the first time. We focus our modeling on the outer part of this disk, consisting of a parent body ring and a halo of small grains. First, we confirm that a model using astronomical silicates cannot simultaneously fit the thermal and scattered light data. Next, we use a simple, generic function for the optical constants to show that varying the dust composition can improve the fit substantially. Finally, we model the dust as a mixture of the most plausible debris constituents: astronomical silicates, water ice, organic refractory material, and vacuum. We achieve a good fit to all datasets with grains composed predominantly of silicates and organics, while ice and vacuum are, at most, present in small amounts. This composition is similar to one derived from previous work on the HR 4796A disk. Our model also fits the thermal SED, scattered light colors, and high-resolution mid-IR data from T-ReCS for this disk. Additionally, we show that sub-blowout grains are a necessary component of the halo.
description: 23 pages, 20 figures, accepted to ApJ
Observational evidence of gravitational collapse of a hyper-massive neutron star post-merger to GW170817
Creators: name: van Putten, Maurice H.P.M.
Publisher: name: Zenodo
Year: 2019
Subjects: binary neutron star coalescence, gravitational waves, black holes, data-analysis

description: Nico van Kampen Colloquium, ITP, Utrecht (Oct 23 2019). Modern astronomy reveals an abundance of neutron stars and black holes in the Milky Way and beyond. Further understanding obtains from multi-messenger observations of MeV-neutrinos from the core-collapse supernova SN1987A and gravitational radiation from the double neutron star merger GW170817. A key open question is the lifetime of the hyper-massive neutron star (HNS) in the immediate aftermath of the latter. To search for the unknown, we developed spectrograms of broadband extended gravitational-wave emission produced by GPU-accelerated butterfly filtering. We serendipitously discovered a descending chirp, starting ts < 1s post-merger emitting (3.5±1)% M⦿c2 over ~5s contemporaneous with GRB17017A. Evidence is based on background and foreground analysis and signal injection experiments. While this emission exceeds the maximal spin-energy of a HNS, it agrees with quadrupole radiation by a non-axisymmetric thick disk or torus sustained over the lifetime of rapid spin of a black hole following gravitational collapse prior to ts. I will present this new finding on calorimetric evidence of rotating black holes, its astrophysical implications and possible counterparts in core-collapse supernovae in the Local Universe, the most energetic of which are known as progenitors of long GRBs.
description: Preferred citation: Central engine of GRB170817A: Neutron star versus Kerr black hole based on multimessenger calorimetry and event timing, Maurice H. P. M. van Putten, Massimo Della Valle A&A 669 A36 (2023), DOI: 10.1051/0004-6361/202142974
description: {"references": ["van Putten, M.H.P.M., Della Valle, M., & Levinson, A., 2019, ApJ, 876, L2", "van Putten, M.H.P.M., & Della Valle, M., 2019, MNRAS, 482, L46", "van Putten, M.H.P.M., Levinson, A., Frontera, F., Guidorzi, C., Lorenzo, A., & Della Valle, M., 2019, EPJ Plus, 134, 537"]}
On Hopf algebroid structure of kappa-deformed Heisenberg algebra
Creators: name: Lukierski, Jerzy
name: Škoda, Zoran
name: Woronowicz, Mariusz
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The $(4+4)$-dimensional $κ$-deformed quantum phase space as well as its $(10+10)$-dimensional covariant extension by the Lorentz sector can be described as Heisenberg doubles: the $(10+10)$-dimensional quantum phase space is the double of $D=4$ $κ$-deformed Poincaré Hopf algebra $\mathbb{H}$ and the standard $(4+4)$-dimensional space is its subalgebra generated by $κ$-Minkowski coordinates $\hat{x}_μ$ and corresponding commuting momenta $\hat{p}_μ$. Every Heisenberg double appears as the total algebra of a Hopf algebroid over a base algebra which is in our case the coordinate sector. We exhibit the details of this structure, namely the corresponding right bialgebroid and the antipode map. We rely on algebraic methods of calculation in Majid-Ruegg bicrossproduct basis. The target map is derived from a formula by J-H. Lu. The coproduct takes values in the bimodule tensor product over a base, what is expressed as the presence of coproduct gauge freedom.
description: 11 pages, RevTeX4, to appear in Proceedings of IX-th International Symposium "Quantum Theory and Symmetries" (QTS-9), held July 13-18, 2015, Yerevan; to be published in "Physics of Atomic Nuclei" (English Version of "Jadernaja Fizika"), ed. G. Pogosyan
Qubit noise spectroscopy for non-Gaussian dephasing environments
Creators: name: Norris, Leigh M.
name: Paz-Silva, Gerardo A.
name: Viola, Lorenza
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce open-loop quantum control protocols for characterizing the spectral properties of non-Gaussian noise, applicable to both classical and quantum dephasing environments. The basic idea is to engineer a multi-dimensional frequency comb via repetition of suitably designed pulse sequences, through which the desired high-order noise spectra may be related to observable properties of the qubit probe. We prove that access to a high time resolution is key to achieve spectral reconstruction over an extended bandwidth, overcoming limitations of existing schemes. Non-Gaussian spectroscopy is demonstrated for a classical noise model describing quadratic dephasing at an optimal point, as well as a quantum spin-boson model out of equilibrium. In both cases, we obtain spectral reconstructions that accurately predict the qubit dynamics in the non-Gaussian regime.
description: 11 pages, 4 figures
Enhanced 3D Object Detection And Tracking In Autonomous Vehicles: An Efficient Multi-modal Deep Fusion Approach
Creators: name: Kalgaonkar, Priyank
Publisher: name: Purdue University Graduate School
Year: 2024
Subjects: classificationCode: 460299
subject: Artificial intelligence not elsewhere classified
classificationCode: 460304
subject: Computer vision

description: This dissertation delves into a significant challenge for Autonomous Vehicles (AVs): achieving efficient and robust perception under adverse weather and lighting conditions. Systems that rely solely on cameras face difficulties with visibility over long distances, while radar-only systems struggle to recognize features like stop signs, which are crucial for safe navigation in such scenarios.To overcome this limitation, this research introduces a novel deep camera-radar fusion approach using neural networks. This method ensures reliable AV perception regardless of weather or lighting conditions. Cameras, similar to human vision, are adept at capturing rich semantic information, whereas radars can penetrate obstacles like fog and darkness, similar to X-ray vision.The thesis presents NeXtFusion, an innovative and efficient camera-radar fusion network designed specifically for robust AV perception. Building on the efficient single-sensor NeXtDet neural network, NeXtFusion significantly enhances object detection accuracy and tracking. A notable feature of NeXtFusion is its attention module, which refines critical feature representation for object detection, minimizing information loss when processing data from both cameras and radars.Extensive experiments conducted on large-scale datasets such as Argoverse, Microsoft COCO, and nuScenes thoroughly evaluate the capabilities of NeXtDet and NeXtFusion. The results show that NeXtFusion excels in detecting small and distant objects compared to existing methods. Notably, NeXtFusion achieves a state-of-the-art mAP score of 0.473 on the nuScenes validation set, outperforming competitors like OFT by 35.1% and MonoDIS by 9.5%.NeXtFusion’s excellence extends beyond mAP scores. It also performs well in other crucial metrics, including mATE (0.449) and mAOE (0.534), highlighting its overall effectiveness in 3D object detection. Visualizations of real-world scenarios from the nuScenes dataset processed by NeXtFusion provide compelling evidence of its capability to handle diverse and challenging environments.
Separation of elastic and inelastic processes in the relaxation time approximation for collision integral
Creators: name: Florkowski, Wojciech
name: Ryblewski, Radoslaw
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce a generalised relaxation-time-approximation form of the collision term in the Boltzmann kinetic equation that allows for using different relaxation times for elastic and inelastic collisions. The efficacy of the proposed framework is demonstrated with the numerical calculations that describe systems with different relations between the two relaxation times and the evolution time of the system.
Международные отношения и Регионоведение,Выпуск 3 (41) 2020
Creators: name: АО «КазУМОиМЯ им.Абылай хана»
Publisher: name: АО «КазУМОиМЯ им.Абылай хана»
Year: 2020

description: Международные отношения и Регионоведение,Выпуск 3 (41) 2020
Room temperature chiral discrimination in paramagnetic NMR spectroscopy
Creators: name: Soncini, Alessandro
name: Calvello, Simone
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A recently proposed theory of chiral discrimination in NMR spectroscopy based on the detection of a molecular electric polarization $\mathbf{P}$ rotating in a plane perpendicular to the NMR magnetic field [A. D. Buckingham, J. Chem. Phys. $\mathbf{140}$, 011103 (2014)], is here generalized to paramagnetic systems. Our theory predicts new contributions to $\mathbf{P}$, varying as the square of the inverse temperature. Ab initio calculations for ten Dy$^{3+}$ complexes, at 293K, show that in strongly anisotropic paramagnetic molecules $\mathbf{P}$ can be more than 1000 times larger than in diamagnetic molecules, making paramagnetic NMR chiral discrimination amenable to room temperature detection.
description: Physical Review Letters, in press (2016). The paper has 5 pages, no figures. Supplementary Material file has 24 pages
Machine learning phases of matter
Creators: name: Carrasquilla, Juan
name: Melko, Roger G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Neural networks can be used to identify phases and phase transitions in condensed matter systems via supervised machine learning. Readily programmable through modern software libraries, we show that a standard feed-forward neural network can be trained to detect multiple types of order parameter directly from raw state configurations sampled with Monte Carlo. In addition, they can detect highly non-trivial states such as Coulomb phases, and if modified to a convolutional neural network, topological phases with no conventional order parameter. We show that this classification occurs within the neural network without knowledge of the Hamiltonian or even the general locality of interactions. These results demonstrate the power of machine learning as a basic research tool in the field of condensed matter and statistical physics.
description: 18 pages, 8 figures, 1 table
Международные отношения и Регионоведение,Выпуск 4 (42) 2020
Creators: name: АО «КазУМОиМЯ им.Абылай хана»
Publisher: name: АО «КазУМОиМЯ им.Абылай хана»
Year: 2020

description: Международные отношения и Регионоведение,Выпуск 4 (42) 2020
Spectral variation in the supergiant fast X-ray transient SAX J1818.6-1703 observed by XMM-Newton and INTEGRAL
Creators: name: Boon, C. M.
name: Bird, A. J.
name: Hill, A. B.
name: Sidoli, L.
name: Sguera, V.
name: Goossens, M. E.
name: Fiocchi, M.
name: McBride, V. A.
name: Drave, S. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the results of a 30ks XMM-Newton observation of the supergiant fast X-ray transient (SFXT) SAX J1818.6-1703 - the first in-depth soft X-ray study of this source around periastron. INTEGRAL observations shortly before and after the XMM-Newton observation show the source to be in an atypically active state. Over the course of the XMM-Newton observation, the source shows a dynamic range of ~100 with a luminosity greater than 1$\times$10$^{35}$ erg s$^{-1}$ for the majority of the observation. After an ~6 ks period of low luminosity (~10$^{34}$ erg s$^{-1}$) emission, SAX J1818.6-1703 enters a phase of fast flaring activity, with flares 250 s long, separated by ~2ks. The source then enters a larger flare event of higher luminosity and ~8 ks duration. Spectral analysis revealed evidence for a significant change in spectral shape during the observation with a photon index varying from Γ ~ 2.5 during the initial low luminosity emission phase, to Γ ~ 1.9 through the fast flaring activity, and a significant change to Γ ~ 0.3 during the main flare. The intrinsic absorbing column density throughout the observation (n$_H$ ~ 5$\times$10$^{23}$ cm$^{-2}$) is among the highest measured from an SFXT, and together with the XMM-Newton and INTEGRAL luminosities, consistent with the neutron star encountering an unusually dense wind environment around periastron. Although other mechanisms cannot be ruled out, we note that the onset of the brighter flares occurs at 3$\times$10$^{35}$ erg s$^{-1}$, a luminosity consistent with the threshold for the switch from a radiative-dominated to Compton cooling regime in the quasi-spherical settling accretion model.
description: 11 pages, 8 figures, Accepted for publication in MNRAS
Asymptotic structure of the Einstein-Maxwell theory on AdS$_{3}$
Creators: name: Perez, Alfredo
name: Riquelme, Miguel
name: Tempo, David
name: Troncoso, Ricardo
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The asymptotic structure of AdS spacetimes in the context of General Relativity coupled to the Maxwell field in three spacetime dimensions is analyzed. Although the fall-off of the fields is relaxed with respect to that of Brown and Henneaux, the variation of the canonical generators associated to the asymptotic Killing vectors can be shown to be finite once required to span the Lie derivative of the fields. The corresponding surface integrals then acquire explicit contributions from the electromagnetic field, and become well-defined provided they fulfill suitable integrability conditions, implying that the leading terms of the asymptotic form of the electromagnetic field are functionally related. Consequently, for a generic choice of boundary conditions, the asymptotic symmetries are broken down to $\mathbb{R}\otimes U\left(1\right)\otimes U\left(1\right)$. Nonetheless, requiring compatibility of the boundary conditions with one of the asymptotic Virasoro symmetries, singles out the set to be characterized by an arbitrary function of a single variable, whose precise form depends on the choice of the chiral copy. Remarkably, requiring the asymptotic symmetries to contain the full conformal group selects a very special set of boundary conditions that is labeled by a unique constant parameter, so that the algebra of the canonical generators is given by the direct sum of two copies of the Virasoro algebra with the standard central extension and $U\left(1\right)$. This special set of boundary conditions makes the energy spectrum of electrically charged rotating black holes to be well-behaved.
description: 18 pages, no figures
Observational Evidence for Extended Emission to GW170817
Creators: name: Van Putten, Maurice H.P.M.
Publisher: name: Zenodo
Year: 2019
Subjects: GW170817, black holes, data-analysis

description: Talk at Astrophysics of GW Populations, Aspen Winter Conference, 2019, Feb 9-15, Aspen Center for Physics, Colorado. We report on E = 3%MSolar c2 in Extended Emission to GW170817 (van Putten & Della Valle, 2019, MNRAS, 482, L46) by signal injection experiments. Quantitative agreement is found with radiation from a non-axisymmetric torus around a rotating black hole formed in delayed core-collapse of a hyper-massive neutron star (HNS) created in the immediate aftermath of the double neutron star merger GW170817. This agreement is based on numerical integration of the equations of suspended accretion for a thick torus with a major radius of about three times the radius of the Inner Most Stable Circular Orbit (ISCO) of the initially non-extremal stellar mass black hole. The observed energies in Multi-Messenger Extended Emission - in GWs, a kilonova and GRB170817A - satisfy the scaling relations of van Putten & Levinson, 2003, ApJ, 584, 937. GW170817EE hereby provides calorimetric evidence for Kerr black holes as objects in Nature proposed in van Putten & Levinson, 2002, Science, 295, 1874.
description: Preferred citation: Multi-messenger Extended Emission from the Compact Remnant in GW170817 van Putten, M.H.P.M.,, Della Valle, M., & Levinson, A., 2019, ApJ, 876, L2, https://doi.org/10.3847/2041-8213/ab18a2
School Climate And Job Satisfaction Of Male And Female Principals In Imo State Public Secondary Schools.pdf
Creators: name: Anakwue, Anthonia  Laetitia
Publisher: name: figshare
Year: 2023
Subjects: Education policy
Sociology of education
Education policy, sociology and philosophy not elsewhere classified

description: This study explored the relationship between school climate and job satisfaction of male and female principals in Imo State public secondary schools. Two research questions were formulated and two alternative hypotheses were tested. It was a correlational study that used two sets of instruments titled ‘‘School Climate Inventory (SCI)’’and the ‘‘Job Descriptive Index (JDI)’’ Questionnaire to collect data. The population was all the 430 public secondary school principals in the six education zones in Imo State. The entire population was studied. In order to determine the internal reliability consistency of the instruments on the pilot population, the Cronbach alpha test was employed in data analysis. Reliability coefficients of 0.84 and 0.81 were obtained. The instruments were thereafter administered on the 430 principals in Imo State.A total of 412 (made up of 172 males and 240 female) out of the 430 copies of SCI and JDI administered were completely filled, giving a 95.8% return rate. This percentage was used in data analysis. Pearson Product Moment Correlation Coefficient was employed in the analysis of the data obtained from the 412 principals. The findings showed that the level of job satisfaction male principals experienced did not significantly vary with the level of job satisfaction female principals experienced. This was an indication that the low job satisfaction observed in public secondary school principals in Imo State was not dependent on their gender. Based on the findings, it was recommended that other school members, particularly, Imo State government, should enhance principals’ job satisfaction by satisfying those needs which principals basically expect from the secondary school system. Keywords: School Climate, Principals, Gender, Job Satisfaction, Secondary School
title: Was ist ein "Stehschein"? : zu Lichtenbergs "Timorus"-Satire und der Sudelbucheintragung D 91
Creators: name: Joost, Ulrich
name: Bartsch, Sabine
name: Borek, Luise
name: Hegel, Philipp
Publisher: name: UNSPECIFIED
Year: 2024

description: Mehrere Jahre bevor der ‚Physiker‘ Lichtenberg durch die Entdeckung seiner nach ihm benannten elektrostatischen Figuren erstmals elektrische Ladung auf der Erde sichtbar und vor allem dauerhaft reproduzierbar machte und dadurch europaweit berühmt wurde (wir verdanken ihm bekanntlich die dadurch ermöglichte und von ihm vorgeschlagene Benennung durch + und -), hatte er sich (freilich pseudonym) einen Namen gemacht als Satiriker: mit seinem ersten Angriff auf den Zürcher Pfarrer Johann Kaspar Lavater. Der hatte nämlich 1771 in einer Widmung seiner Teilübersetzung von „La palingénésie philosophique ou Idées sur l’état passé et sur l’état futur des étres vivans“ (Genf 1769) des Philosophen Charles Bonnet (als „Philosophische Untersuchung der Beweise für das Christentum“, Zürich 1771) Moses Mendelssohn, den Berliner jüdischen Philosophen aus Dessau und Empfänger dieser Widmung, aufgefordert, entweder die Argumente Bonnets zu widerlegen – oder endlich den rechten Glauben, das Christentum, anzunehmen und sich taufen zu lassen.
Международные отношения и Регионоведение,Выпуск 1 (43) 2021
Creators: name: АО «КазУМОиМЯ им.Абылай хана»
Publisher: name: АО «КазУМОиМЯ им.Абылай хана»
Year: 2021

description: Международные отношения и Регионоведение,Выпуск 1 (43) 2021
Asphericity of a length four relative group presentation
Creators: name: Ahmad, Abd Ghafur Bin
name: Al-Mulla, Muna A
name: Edjvet, Martin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F05, 57M05

description: We consider the relative group presentation $\mathcal{P} = \langle G, \mathbf{x} | \mathbf{r} \rangle$ where $\mathbf{x} = \{ x \}$ and $\mathbf{r} = \{ xg_1 xg_2 xg_3 x^{-1} g_4 \}$. We show modulo a small number of exceptional cases exactly when $\mathcal{P}$ is aspherical. If $H = \langle g_1^{-1} g_2, g_1^{-1} g_3 g_1 , g_4 \rangle \leq G$ then the exceptional cases occur when $H$ is isomorphic to one of $C_5,C_6,C_8$ or $C_2 \times C_4$.
description: 53 pages
Time-Varying Sodium Absorption in the Type Ia Supernova 2013gh
Creators: name: Ferretti, R.
name: Amanullah, R.
name: Goobar, A.
name: Johansson, J.
name: Vreeswijk, P. M.
name: Butler, R. P.
name: Cao, Y.
name: Cenko, S. B.
name: Doran, G.
name: Filippenko, A. V.
name: Freeland, E.
name: Hosseinzadeh, G.
name: Howell, D. A.
name: Lundqvist, P.
name: Mattila, S.
name: Nordin, J.
name: Nugent, P. E.
name: Petrushevska, T.
name: Valenti, S.
name: Vogt, S.
name: Wozniak, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Temporal variability of narrow absorption lines in high-resolution spectra of Type Ia supernovae (SNe Ia) is studied to search for circumstellar matter. Time series which resolve the profiles of absorption lines such as Na I D or Ca II H&K are expected to reveal variations due to photoionisation and subsequent recombination of the gases. The presence, composition, and geometry of circumstellar matter may hint at the elusive progenitor system of SNe Ia and could also affect the observed reddening law. To date, there are few known cases of time-varying Na I D absorption in SNe Ia, all of which occurred during relatively late phases of the supernova evolution. Photoionisation, however, is predicted to occur during the early phases of SNe Ia, when the supernova peaks in the ultraviolet. We therefore attempt to observe early-time absorption-line variations by obtaining high-resolution spectra of SNe before maximum light. We have obtained photometry and high-resolution spectroscopy of SNe Ia 2013gh and iPTF 13dge, to search for absorption- line variations. Furthermore, we study interstellar absorption features in relation to the observed photometric colours of the SNe. Results. Both SNe display deep Na I D and Ca II H&K absorption features. Furthermore, small but significant variations are detected in a feature of the Na I D profile of SN 2013gh. The variations are consistent with either geometric effects of rapidly moving or patchy gas clouds or photoionisation of Na I gas at R \approx 1019 cm from the explosion. Our analysis indicates that it is necessary to focus on early phases to detect photoionisation effects of gases in the circumstellar medium of SNe Ia. Different absorbers such as Na I and Ca II can be used to probe for matter at different distances from the SNe.
description: accepted for publication in A&A