cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the cyclicity of weight-homogeneous centers
Creators: name: Gavrilov, Lubomir
name: Gine, Jaume
name: Grau, Maite
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 34C07, 34C05, 34C14

description: Let W be a weight-homogeneous planar polynomial differential system with a center. We find an upper bound of the number of limit cycles which bifurcate from the period annulus of W under a generic polynomial perturbation. We apply this result to a particular family of planar polynomial systems having a nilpotent center without meromorphic first integral.
description: 13 pages, no figures
Vom Minoritenkloster zum Jesuitenkolleg – Archäologisches zu den Schriftquellen
Creators: name: Gündchen, Robert
name: Lodemann, Till
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Neue Forschungen zur Raffenburg – Vermessung, Grabung und Fundsichtung
Creators: name: Cichy, Eva
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Ein Schnallenbeschlag im Kontext der hochmittelalterlichen Besiedlung im Soester Norden
Creators: name: Heinze, Frederik
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Archäologie mit Sprengstoff – archäologische Untersuchung eines Pingenzugs bei Brilon
Creators: name: Zeiler, Manuel
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Starke Mauer und hohe Türme – der Verlauf der mittelalterlichen Stadtmauer in Paderborn
Creators: name: Gai, Sveva
name: Mahytka, Ralf
name: Süße, Robert
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Klostermauern, Knochenschnitzer und Kloaken an der Salzstraße in Münster
Creators: name: Buschmann, Ute
name: Markus, Jan
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
A note on Tsuji's criterion for numerical triviality
Creators: name: Fukuda, Shigetaka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14C20

description: In this study, we give an alternative and elementary proof to Tsuji's criterion for a Cartier divisor to be numerically trivial.
description: 10 pages, LaTeX2e; with minor changes
Spuren einer Lederwerkstatt auf einem frühstädtischen Grundstück in Lippstadt
Creators: name: Manz, Eva
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Kirchengrundriss im Gemüsegarten – die älteste Kirche von Vlotho-Wehrendorf
Creators: name: Beyer, Christoph
name: Spiong, Sven
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Haupthof der Villikation Enenhues? Erste Siedlungsreste entlang der Pader
Creators: name: Gai, Sveva
name: Lodemann, Till
name: Melisch, Claudia
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Tierkadaver im Spitzgraben – Einblicke in die Frühgeschichte Münsters am Roggenmarkt
Creators: name: Becker, Valeska
name: Hessel, Peter
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Neue mittelalterliche Siedlungsspuren im Westmünsterland
Creators: name: Aeissen, Martha
name: Bertuch, Mathias
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Z and W production associated with quark-antiquark pair in k_T-factorization at the LHC
Creators: name: Deak, M.
name: Schwennsen, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate and analyze Z and W production in association with quark-antiquark pair in k_T-factorization. Numerical calculations are performed using the Monte Carlo generator CASCADE for proton proton collisions at LHC energy. We compare total and differential cross sections calculated in k_T-factorization approach with total differential cross sections obtained in LO and NLO calculations in collinear factorization approach. We provide strong evidence that some of the effects of the NLO and even higher order collinear calculation are already included in the LO k_T-factorization calculation.
description: 25 pages, 18 figures, final version to be pubslished in JHEP
^{17}O and ^{51}V NMR for the zigzag spin-1 chain compound CaV2O4
Creators: name: Zong, X.
name: Suh, B. J.
name: Niazi, A.
name: Yan, J. Q.
name: Schlagel, D. L.
name: Lograsso, T. A.
name: Johnston, D. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: $^{51}$V NMR studies on CaV2O4 single crystals and $^{17}$O NMR studies on $^{17}$O-enriched powder samples are reported. The temperature dependences of the $^{17}$O NMR line width and nuclear spin-lattice relaxation rate give strong evidence for a long-range antiferromagnetic transition at Tn = 78 K in the powder. Magnetic susceptibility measurements show that Tn = 69 K in the crystals. A zero-field $^{51}$V NMR signal was observed at low temperatures (f $\approx$ 237 MHz at 4.2 K) in the crystals. The field swept spectra with the field in different directions suggest the presence of two antiferromagnetic substructures. Each substructure is collinear, with the easy axes of the two substructures separated by an angle of 19(1) degree, and with their average direction pointing approximately along the b-axis of the crystal structure. The two spin substructures contain equal number of spins. The temperature dependence of the ordered moment, measured up to 45 K, shows the presence of an energy gap Eg in the antiferromagnetic spin wave excitation spectrum. Antiferromagnetic spin wave theory suggests that Eg lies between 64 and 98 K.
description: 11 pages, 14 figures. v2: 2 new figures; version published in Phys. Rev. B
Ein zweiphasiger Hausgrundriss des Frühmittelalters an der Schultenstraße in Rheine
Creators: name: Kerk, Lukas
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
»nicht alders kann ich finden« – merowingerzeitliche Gräber bei St. Martin in Dortmund
Creators: name: Sicherl, Bernhard
name: Bakko, Hassan
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Kuramoto model for populations of quadratic integrate-and-fire neurons with chemical and electrical coupling
Creators: name: Clusella, Pau
name: Pietras, Bastian
name: Montbrió, Ernest
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We derive the Kuramoto model (KM) corresponding to a population of weakly coupled, nearly identical quadratic integrate-and-fire (QIF) neurons with both electrical and chemical coupling. The ratio of chemical to electrical coupling determines the phase lag of the characteristic sine coupling function of the KM and critically determines the synchronization properties of the network. We apply our results to investigate chimera states in two coupled populations of identical QIF neurons. We find that the presence of both electrical and chemical coupling is a necessary condition for chimera states to exist. Finally, we numerically demonstrate that chimera states gradually disappear as coupling strengths cease to be weak.
Dynamic origin of the morphotropic phase boundary - Soft modes and phase instability in 0.68Pb(Mg1/3Nb2/3O3)-0.32PbTiO3
Creators: name: Cao, Hu
name: Stock, Chris
name: Xu, Guangyong
name: Gehring, Peter M.
name: Li, Jiefang
name: Viehland, Dwight
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report neutron inelastic scattering on single crystal 0.68Pb(Mg1/3Nb2/3O3)-0.32PbTiO3 (PMN-0.32PT), a relaxor ferroelectric material that lies within the compositional range of the morphotropic phase boundary (MPB). Data were obtained between 100 K and 600 K under zero and non-zero electric field applied along the cubic [001] direction. The lowest energy, zone-center, transverse optic phonon is strongly damped and softens slowly at high temperature; however the square of the soft mode energy begins to increase linearly with temperature as in a conventional ferroelectric, which we term the soft mode "recovery," upon cooling into the tetragonal phase at TC. Our data show that the soft mode in PMN-0.32PT behaves almost identically to that in pure PMN, exhibiting the same temperature dependence and recovery temperature even though PMN exhibits no well-defined structural transition (no TC). The temperature dependence of the soft mode in PMN-0.32PT is also similar to that in PMN-0.60PT; however in PMN-0.60PT the recovery temperature equals TC. These results suggest that the temperature dependence and the energy scale of the soft mode dynamics in PMN-xPT are independent of concentration on the Ti-poor side of the MPB, but scale with TC for Ti-rich compositions. Thus the MPB may be defined in lattice dynamical terms as the concentration where TC first matches the recovery temperature of the soft mode. High-resolution x-ray studies show that the cubic-to-ferroelectric phase boundary shifts to higher temperatures by an abnormal amount within the MPB region in the presence of an electric field. This suggests that an unusual instability exists within the apparently cubic phase at the MPB.
description: 13 pages, 6 figures
ПРЕДУПРЕЖДЕНИЕ ФИНАНСОВОГО КРИЗИСА ДЛЯ СЕЛЬСКОХОЗЯЙСТВЕННЫХ ПРОИЗВОДИТЕЛЕЙ В ПЕРИОД И ПОСЛЕ ПАНДЕМИИ
Creators: name: БЕСШАПОШНЫЙ М. Н.
name: ИДАЯТОВ Г. Ф.
Publisher: name: Образование и право
Year: 2020
Subjects: финансовая устойчивость
агропромышленный комплекс
субсидии
дотации
несвязанная поддержка
оптимизация
производительность труда в АПК

description: Современная система экономических отношений никогда прежде не испытывала тех проблем, которые в настоящий момент вызывают негативное воздействие на все отрасли народного хозяйства, как на микро, так и на макро уровнях. Агропромышленный сектор экономики в таких условиях ждет несколько вызовов, с которыми необходимо бороться и минимизировать отрицательные последствия их воздействия. К таким вызовам следует отнести снижение покупательной способности населения, рост безработицы, ограничение экспортных поставок продовольствия, снижение цены на продовольственные товары. Исходя из специфики и важности агропромышленного сектора народного хозяйства для обеспечения продовольственной безопасности и независимости нашей страны, в данной статье мы попытаемся предложить меры по повышению финансовой устойчивости сельхозтоваропроизводителей и снижению отрицательного воздействия на них, кризиса, вызванного пандемией на агропромышленный сектор экономики.
The experiences of patients who elope from psychiatric units : a qualitative study
Creators: name: McIndoe, Katherine Isobel
Publisher: name: University of British Columbia
Year: 2010

description: This study was designed to investigate how psychiatric patients explain their elopements from hospital. A limited amount is known about elopement and the available literature is written from the perspective of the caretaker. The study was qualitative in design. Indepth interviews were conducted with five patients when they returned to the hospital following their elopements. The data from these interviews were analyzed using content analysis and from this analysis, conceptual themes were constructed. The concept of alienation was utilized by the researcher to explain the accounts of the patients. The patients in the study experienced a loss of control over their entry into hospital, over their treatment and programme, and over events directly linked to their elopements. The programmes and treatments were frequently viewed as meaningless or not making sense. Elopement was viewed as a positive event by each of the patients because it provided an opportunity for some control and some freedom. The interdependence between the patients' subjective experiences and the objective organization of the hospital was examined. It was explained that due to their placement in the hierarchy of the hospital, patients often feel powerless to affect what is occurring. Moreover, the patients in this study felt they were not informed about the rationales for the decisions that were made about them. It was argued that while nurses believe they are addressing the concerns of patients, this did not occur for the people in this study. Implications for nursing practice, education and research concluded this study.
Postnatal guidance and maternal confidence
Creators: name: Pullen, Phyllis Margaret
Publisher: name: University of British Columbia
Year: 2010

description: Primigravida mothers need positive feedback and successes in infant care giving if they are to learn and to continue learning about caring for their infants. Maternal confidence increases as the mothers succeed and master the skills required. Confidence is related to good maternal-infant relationships. Public health nurses have opportunities to provide support and positive learning experiences which should increase maternal confidence. This quasi-experimental study was undertaken to evaluate the effect of an interview technique used at child health conferences, oni primigravida mothers' confidence as parents and infant care givers. The interview was constructed to focus on the mothers' successes in infant care giving, rather than problems. A non-time equivalent pretest-posttest questionnaire or confidence measure was used to gather the data. The subjects were 34 primparous women with healthy babies from intact family situations. Sixteen mothers, recruited at child health conferences in one health unit area, finished the study in the control group. Eighteen mothers finished the study in the experimental group. Five instructed public health nurses interviewed the experimental group subjects. Control group subjects had the regular child health conference interview. All subjects filled in the questionnaire prior to their first child health, conference when the infant was two months old and again after the second child health;conference when their infant was four months old. Statistical analysis comparing the pretest and posttest scores for both groups indicated no significant difference between the two groups on the pretest or the posttest scores. Maternal confidence, in both groups, as indicated by the confidence measure, did increase significantly over the two month period from two months postpartum to four months postpartum. This was not related to a specific nursing interview technique. Implications for nursing practice are discussed and recommendations made for further research.
Position Paper by Concerned Scientists : Doongmabulla Springs: Potential impacts from the Carmichael Mine
Creators: name: Werner, Adrian
name: Love, Andrew James
name: Irvine:, Dylan
name: Banks, Edward Wallace
name: Cartwright:, Ian
name: Webb, John
name: Currell, Matthew
name: Keegan-Treloar, Robin
Publisher: name: Flinders University
Year: 2019
Subjects: Position Paper
Doongmabulla Springs
Carmichael Mine
Adani
Adaptive Management
Galilee Basin

description: Key points: (1) Adani appears likely to have significantly under-estimated future impacts to the Doongmabulla Springs Complex (DSC) arising from the Carmichael Mine. (2) Should the Carmichael Mine cause springs within the DSC to cease flowing, this impact may be irreversible. (3) The safeguard against DSC impacts proposed by Adani, namely Adaptive Management, is unsuitable and unlikely to protect the DSC from severe degradation or cessation of flow. (4) Possible cumulative impacts to the DSC from other mining activities in the Galilee Basin have not been adequately considered.
Analytic linearization of nonlinear perturbations of Fuchsian systems
Creators: name: Costin, Rodica D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34M35 (Primary); 34H05, 34C20 (Secondary)

description: Nonlinear perturbation of Fuchsian systems are studied in regions including two singularities. Such systems are not necessarily analytically equivalent to their linear part (they are not linearizable). Nevertheless, it is shown that in the case when the linear part has commuting monodromy, and the eigenvalues have positive real parts, there exists a unique correction function of the nonlinear part so that the corrected system becomes analytically linearizable.
Ein imitativer – gotischer? – Aureus des Severus Alexander aus Salzkotten-Scharmede
Creators: name: Kötz, Stefan
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Pure Point Spectrum of the Floquet Hamiltonian for the Quantum Harmonic Oscillator Under Time Quasi- Periodic Perturbations
Creators: name: Wang, W. -M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81xx

description: We prove that the $1-d$ quantum harmonic oscillator is stable under spatially localized, time quasi-periodic perturbations on a set of Diophantine frequencies of positive measure. This proves a conjecture raised by Enss-Veselic in their 1983 paper \cite{EV} in the general quasi-periodic setting. The motivation of the present paper also comes from construction of quasi-periodic solutions for the corresponding nonlinear equation.
A new empirical formula for α-decay half-life and decay chains of Z=120 isotopes
Creators: name: Saxena, G.
name: Jain, A.
name: Sharma, P. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Experimental $α$-decay half-life, spin, and parity of 398 nuclei in the range 50$\leq$Z$\leq$118 are utilized to propose a new formula (QF) with only 4 coefficients as well as to modify the Tagepera-Nurmia formula with just 3 coefficients (MTNF) by employing nonlinear regressions. These formulas, based on reduced mass ($μ$) and angular momentum taken away by the $α$-particle, are ascertained very effective for both favoured and unfavoured $α$-decay in addition to their excellent match with all (Z, N) combinations of experimental $α$-decay half-lives. After comparing with similar other empirical formulas of $α$-decay half-life, QF and MTNF formulas are purported with accuracy, minimum uncertainty and deviation, dependency on least number of fitted coefficients together with less sensitivity to the uncertainties of $Q$-values. The QF formula is applied to predict $α$-decay half-lives for 724 favoured and 635 unfavoured transitions having experimentally known $Q$-values. Moreover, these available $Q$-values are also employed to test various theoretical approaches viz. RMF, FRDM, WS4, RCHB, etc. along with machine learning method XGBoost for determining theoretical $Q$-values, incisively. Thereafter, using $Q$-values from the most precise theoretical treatment mentioned above along with the proposed formulas, probable $α$-decay chains for Z$=$120 isotopes are identified.
description: Accepted in Physica Scripta-IOPscience
The $^{15}$O($α$,$γ$)$^{19}$Ne Breakout Reaction and Impact on X-Ray Bursts
Creators: name: Tan, W. P.
name: Fisker, J. L.
name: Goerres, J.
name: Couder, M.
name: Wiescher, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The breakout reaction $^{15}$O($α,γ$)$^{19}$Ne, which regulates the flow between the hot CNO cycle and the rp-process, is critical for the explanation of the burst amplitude and periodicity of X-ray bursters. We report on the first successful measurement of the critical $α$-decay branching ratios of relevant states in $^{19}$Ne populated via $^{19}$F($^3$He,t)$^{19}$Ne. Based on the experimental results and our previous lifetime measurements of these states, we derive the first experimental rate of $^{15}$O($α,γ$)$^{19}$Ne. The impact of our experimental results on the burst pattern and periodicity for a range of accretion rates is analyzed.
description: 4 pages with 5 figures
ADO-LLM: Analog Design Bayesian Optimization with In-Context Learning of Large Language Models
Creators: name: Yin, Yuxuan
name: Wang, Yu
name: Xu, Boxun
name: Li, Peng
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Analog circuit design requires substantial human expertise and involvement, which is a significant roadblock to design productivity. Bayesian Optimization (BO), a popular machine learning based optimization strategy, has been leveraged to automate analog design given its applicability across various circuit topologies and technologies. Traditional BO methods employ black box Gaussian Process surrogate models and optimized labeled data queries to find optimization solutions by trading off between exploration and exploitation. However, the search for the optimal design solution in BO can be expensive from both a computational and data usage point of view, particularly for high dimensional optimization problems. This paper presents ADO-LLM, the first work integrating large language models (LLMs) with Bayesian Optimization for analog design optimization. ADO-LLM leverages the LLM's ability to infuse domain knowledge to rapidly generate viable design points to remedy BO's inefficiency in finding high value design areas specifically under the limited design space coverage of the BO's probabilistic surrogate model. In the meantime, sampling of design points evaluated in the iterative BO process provides quality demonstrations for the LLM to generate high quality design points while leveraging infused broad design knowledge. Furthermore, the diversity brought by BO's exploration enriches the contextual understanding of the LLM and allows it to more broadly search in the design space and prevent repetitive and redundant suggestions. We evaluate the proposed framework on two different types of analog circuits and demonstrate notable improvements in design efficiency and effectiveness.
description: 9 pages, 3 figures
Performance-based optimal distribution of viscous dampers in structure using hysteretic energy compatible endurance time excitations
Creators: name: Shirkhani, Amir
name: Azar, Bahman Farahmand
name: Basim, Mohammad Charkhtab
name: Mashayekhi, Mohammadreza
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geophysics (physics.geo-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Performance-based optimization of energy dissipation devices in structures necessitates massive and repetitive dynamic analyses. In the endurance time method known as a rather fast dynamic analysis procedure, structures are subjected to intensifying dynamic excitations and their response at multiple intensity levels is estimated by a minimal number of analyses. So, this method significantly reduces computational endeavors. In this paper, the endurance time method is employed to determine the optimal placement of viscous dampers in a weak structure to achieve the desired performance at various hazard levels, simultaneously. The viscous damper is one of the energy dissipation systems which can dissipate a large amount of seismic input energy to the structure. To this end, hysteretic energy compatible endurance time excitation functions are used and the validity of the results is investigated by comparing them with the results obtained from a suite of ground motions. To optimize the placement of the dampers, the genetic algorithm is used. The damping coefficients of the dampers are considered as design variables in the optimization procedure and determined in such a way that the sum of them has a minimum value. The behavior of the weak structure before and after rehabilitation is also investigated using endurance time and nonlinear time history analysis procedures in different hazard levels.
description: This article has been fully published in NMCE journal
Ein Pugio mit silbertauschierter Scheide und Gürtel aus dem Gräberfeld von Haltern
Creators: name: Tremmel, Bettina
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Do Evaporating Black Holes Form Photospheres?
Creators: name: MacGibbon, Jane H.
name: Carr, B. J.
name: Page, Don N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Several authors, most notably Heckler, have claimed that the observable Hawking emission from a microscopic black hole is significantly modified by the formation of a photosphere around the black hole due to QED or QCD interactions between the emitted particles. In this paper we analyze these claims and identify a number of physical and geometrical effects which invalidate these scenarios. We point out two key problems. First, the interacting particles must be causally connected to interact, and this condition is satisfied by only a small fraction of the emitted particles close to the black hole. Second, a scattered particle requires a distance ~ E/m_e^2 for completing each bremsstrahlung interaction, with the consequence that it is improbable for there to be more than one complete bremsstrahlung interaction per particle near the black hole. These two effects have not been included in previous analyses. We conclude that the emitted particles do not interact sufficiently to form a QED photosphere. Similar arguments apply in the QCD case and prevent a QCD photosphere (chromosphere) from developing when the black hole temperature is much greater than Lambda_QCD, the threshold for QCD particle emission. Additional QCD phenomenological arguments rule out the development of a chromosphere around black hole temperatures of order Lambda_QCD. In all cases, the observational signatures of a cosmic or Galactic halo background of primordial black holes or an individual black hole remain essentially those of the standard Hawking model, with little change to the detection probability. We also consider the possibility, as proposed by Belyanin et al. and D. Cline et al., that plasma interactions between the emitted particles form a photosphere, and we conclude that this scenario too is not supported.
description: version published in Phys Rev D 78, 064043; 25 pages, 3 figures; includes discussion on extending our analysis to TeV-scale, higher-dimensional black holes
The Ponzano-Regge asymptotic of the 6j symbol: an elementary proof
Creators: name: Gurau, Razvan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we give a direct proof of the Ponzano-Regge asymptotic formula for the Wigner 6j symbol starting from Racah's single sum formula. Our method treats halfinteger and integer spins on the same footing. The generalization to Minkowskian tetrahedra is direct. This result should be relevant for the introduction of renormalization scales in spin foam models.
description: 12 pages, 1 figures
The development of an instrument to measure the professional role attitudes of diploma nursing students
Creators: name: Peregrym, Elinor Jill
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this study was to develop and test an instrument that would measure the professional role attitudes of diploma nursing students. A Likert scale was constructed to fulfill the above purpose. Items were designed to address the following six characteristics of professional nursing extracted from the literature: commitment to education, service orientation, autonomy, participation in the professional association, accountability, and expectation of appropriate remuneration. The items were critiqued by a panel of nursing instructors and revised prior to administration. The original instrument, which consisted of 60 items, was completed by 407 diploma nursing students from k schools of nursing in British Columbia. On the basis of the correlation of each item with the total score, 4O items were selected for the final instrument in the study. Data analysis indicated that the instrument requires revision before it will be suitable for use. Two of the items were found to be ambiguous, and a number of others were found to be insufficiently discriminating. The reliability index for the final instrument was high enough to be considered acceptable for use in basic research on groups. Although the results of factor analysis were inconclusive, it was found that, with the exception of education and accountability, items did not cluster in accordance with the six characteristics of professional nursing extracted from the literature. Factor analysis also suggested that the concept of professional attitudes might be too broad to measure in one homogeneous scale. Content validity was considered to be inherent in the methods employed for instrument construction.
Eisen- und Völkerwanderungszeit beiderseits des Wiehengebirges und an der Weser
Creators: name: Pollmann, Hans-Otto
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Some linear and nonlinear integral inequalities on time scales in two independent variables
Creators: name: Ferreira, Rui A. C.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 26D15; 45K05

description: We establish some linear and nonlinear integral inequalities of Gronwall-Bellman-Bihari type for functions with two independent variables on general time scales. The results are illustrated with examples, obtained by fixing the time scales to concrete ones. An estimation result for the solution of a partial delta dynamic equation is given as an application.
description: Keywords: integral inequalities; Gronwall-Bellman-Bihari inequalities; time scales; two independent variables
Dociostaurus brevicollis
Creators: name: Terskov, E. N.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Acrididae
Dociostaurus
Dociostaurus brevicollis

description: Dociostaurus brevicollis (Eversmann, 1848)
МатериаΔ. Окр. пос. Береговой, степь, 8.07.2017, 2♂, 10♀ (7); окр. ст. Старотитаровская, степь, 11.07.2017, 2♂, 4♀ (16).
Замечания. Встречается на степных участках с разнотравно-зΛаковой раститеΛьностью. ФакуΛьтативный хортобионт.
description: Published as part of Terskov, E. N., 2017, Notes to the fauna and bionomics of grasshoppers (Orthoptera: Acridoidea) of the Taman Peninsula with record of a new species for the Caucasus, pp. 15-21 in Caucasian Entomological Bulletin 13 (1) on pages 17-18, DOI: 10.23885/1814-3326-2017-13-1-15-21, http://zenodo.org/record/8145537
The trigger and data acquisition system of the FASER experiment
Creators: name: FASER Collaboration
name: Abreu, Henso
name: Mansour, Elham Amin
name: Antel, Claire
name: Ariga, Akitaka
name: Ariga, Tomoko
name: Bernlochner, Florian
name: Boeckh, Tobias
name: Boyd, Jamie
name: Brenner, Lydia
name: Cadoux, Franck
name: Casper, David
name: Cavanagh, Charlotte
name: Chen, Xin
name: Coccaro, Andrea
name: Debieux, Stephane
name: Dmitrievsky, Sergey
name: D'Onofrio, Monica
name: Dozen, Candan
name: Favre, Yannick
name: Fellers, Deion
name: Feng, Jonathan L.
name: Ferrere, Didier
name: Gamberini, Enrico
name: Galantay, Edward Karl
name: Gibson, Stephen
name: Gonzalez-Sevilla, Sergio
name: Gornushkin, Yuri
name: Gwilliam, Carl
name: Hsu, Shih-Chieh
name: Hu, Zhen
name: Iacobucci, Giuseppe
name: Inada, Tomohiro
name: Jakobsen, Sune
name: Johnson, Eliott
name: Kajomovitz, Enrique
name: Kling, Felix
name: Kose, Umut
name: Kuehn, Susanne
name: Lefebvre, Helena
name: Levinson, Lorne
name: Li, Ke
name: Liu, Jinfeng
name: Magliocca, Chiara
name: McFayden, Josh
name: Milanesio, Matteo
name: Meehan, Sam
name: Mladenov, Dimitar
name: Moretti, Theo
name: Munker, Magdalena
name: Nakamura, Mitsuhiro
name: Nakano, Toshiyuki
name: Nessi, Marzio
name: Neuhaus, Friedemann
name: Nevay, Laurie
name: Otono, Hidetoshi
name: Pandini, Carlo
name: Pang, Hao
name: Paolozzi, Lorenzo
name: Petersen, Brian
name: Pietropaolo, Francesco
name: Prim, Markus
name: Queitsch-Maitland, Michaela
name: Resnati, Filippo
name: Rizzi, Chiara
name: Ruiz-Choliz, Elisa
name: Rokujo, Hiroki
name: Salfeld-Nebgen, Jakob
name: Sato, Osamu
name: Scampoli, Paola
name: Schmieden, Kristof
name: Schott, Matthias
name: Sfyrla, Anna
name: Shively, Savannah
name: Sipos, Roland
name: Spencer, John
name: Takubo, Yosuke
name: Tarannum, Noshin
name: Theiner, Ondrej
name: Torrence, Eric
name: Tufanli, Serhan
name: Vasina, Svetlana
name: Vormwald, Benedikt
name: Wang, Di
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The FASER experiment is a new small and inexpensive experiment that is placed 480 meters downstream of the ATLAS experiment at the CERN LHC. FASER is designed to capture decays of new long-lived particles, produced outside of the ATLAS detector acceptance. These rare particles can decay in the FASER detector together with about 500-1000 Hz of other particles originating from the ATLAS interaction point. A very high efficiency trigger and data acquisition system is required to ensure that the physics events of interest will be recorded. This paper describes the trigger and data acquisition system of the FASER experiment and presents performance results of the system acquired during initial commissioning.
Objective risk stratification of prostate cancer using machine learning and radiomics applied to multiparametric magnetic resonance images
Creators: name: Bino Varghese
name: Chen, Frank
name: Hwang, Darryl
name: Palmer, Suzanne L.
name: Abreu, Andre Luis De Castro
name: Ukimura, Osamu
name: Monish Aron
name: Aron, Manju
name: Inderbir Gill
name: Duddalwar, Vinay
name: Gaurav Pandey
Publisher: name: F1000 Research Limited
Year: 2019

description: A major issue with the interpretation of tumor imaging data is the discordance between patients’ inferred clinical risk and their imaging findings. The derivation of unbiased content‑oriented features from these images (radiomics) and their subsequent use in frameworks based on machine learning (ML) methods can augment radiologists’ role in clinical care by providing more objective risk assessments. Previous work in this direction has been limited to the use of one or a small number of ML, specifically classification, methods, and their evaluation using standard measures like AUC. Developing an automated framework that systematically and rigorously identifies the best classifier(s) for predicting tumor risk with a given
set of radiomic features can substantially boost the potential of this approach. We developed such a framework comprised of classification, cross‑validation and statistical analyses to identify a classifier that most accurately differentiates high‑risk prostate cancer (PCa) patients from lower‑risk ones in a sizeable cohort examined using multi‑parametric MRI (mpMRI). This framework examined seven commonly used classifiers in terms of their performance and stability for predicting PCa risk using 110 radiomics features extracted from T2‑ and Diffusion‑weighted mpMRI images. Our cohort consisted of 121 PCa patients, which was randomly split into training (n = 68) and validation (n = 53) sets prior to the application of our framework.
Using a systematic cross‑validation setup and rigorous statistical analysis of the performance of candidate classifiers evaluated on the training set, the framework identified the Quadratic kernel Support Vector Machine (QSVM) classifier as the most effective PCa risk prediction method. Indeed, the QSVM classifier performed well on the independent validation set in terms of a variety of evaluation measures (AUC=0.71, F‑measure=0.69, Precision=0.57 and Recall=0.86). In particular, it performed better than PI‑RADS v2, the imaging score‑based method currently used to clinically assess PCa risk, especially in terms of class‑specific evaluation measures, namely F‑measure (0.52), Precision (0.45) and Recall (0.61). The use of these class‑specific measures, also a novelty of our framework, enables the assessment of a classifier’s performance on the hardest class(es) of patients, such as the high‑risk PCa patients in our cohort. These results demonstrate the effectiveness of data-driven frameworks like ours for assessing and deriving objective imaging‑based risk predictors that can assist radiologists in improving clinical care.
Bremsstrahlung Effects around Evaporating Black Holes
Creators: name: Page, Don N.
name: Carr, B. J.
name: MacGibbon, Jane H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss a variety of bremsstrahlung processes associated with charged particles emitted by evaporating black holes. We show that such particles produce a negligible number of bremsstrahlung photons from their scattering off each other, though at low frequencies inner bremsstrahlung photons dominate over the direct Hawking emission of photons. This analysis and the further analysis of the accompanying paper invalidate Heckler's claim that sufficiently hot evaporating black holes form QED photospheres.
description: version published in PRD 78, 064044; 10 pages
Enhancing key rates of QKD protocol by Coincidence Detection
Creators: name: Sharma, Tanya
name: Bhavsar, Rutvij
name: Ramakrishnan, Jayanth
name: Chandravanshi, Pooja
name: Prabhakar, Shashi
name: Biswas, Ayan
name: Singh, R. P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In theory, quantum key distribution (QKD) provides unconditional security; however, its practical implementations are susceptible to exploitable vulnerabilities. This investigation tackles the constraints in practical QKD implementations using weak coherent pulses. We improve on the conventional approach of using decoy pulses by integrating it with the coincidence detection (CD) protocol. Additionally, we introduce an easy-to-implement algorithm to compute asymptotic key rates for the protocol. Furthermore, we have carried out an experimental implementation of the protocol, where we demonstrate that monitoring coincidences in the decoy state protocol leads to enhanced key rates under realistic experimental conditions.
description: 19 pages, 3 figures. Comments are welcome
Updated Magnetized Transport Coefficients: Impact on Laser-Plasmas with Self-Generated or Applied Magnetic Fields
Creators: name: Walsh, Christopher
name: Sadler, James
name: Davies, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Errors in the Epperlein & Haines [PoF (1986)] transport coefficients were recently found at low electron magnetizations, with new magnetic transport coefficients proposed simultaneously by two teams [Sadler, Walsh & Li, PRL (2021) and Davies, Wen, Ji & Held, PoP (2021)]; these two separate sets of updated coefficients are shown in this paper to be in agreement. The importance of these new coefficients in laser-plasmas with either self-generated or applied magnetic fields is demonstrated. When an external magnetic field is applied, the cross-gradient-Nernst term twists the field structure; this twisting is reduced by the new coefficients in the low magnetization regime. For plasmas where only self-generated magnetic fields are present, the new coefficients are found to result in the magnetic field moving with the Righi-Leduc heat-flow, enhancing the impact of MHD. Simulations of Biermann Battery magnetic fields around ICF hot-spot perturbations are presented, with cross-gradient-Nernst transport increasing spike penetration.
Schwertbarren und Lanzenschuh – eine eisenzeitliche Siedlung bei Attendorn
Creators: name: Eggenstein, Georg
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Free-free absorption in hot relativistic flows: application to fast radio bursts
Creators: name: Kundu, Esha
name: Zhang, Bing
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Magnetic flares create hot relativistic shocks outside the light cylinder radius of a magnetised star. Radio emission produced in such a shock or at a radius smaller than the shock undergoes free-free absorption while passing through the shocked medium. In this work, we demonstrate that this free-free absorption can lead to a negative drift in the frequency-time spectra. Whether it is related to the downward drift pattern observed in fast radio bursts (FRBs) is unclear. However, if the FRB down drifting is due to this mechanism then it will be pronounced in those shocks that have isotropic kinetic energies $\gtrsim10^{44}$ erg. In this model, for an internal shock with a Lorentz factor $\sim100$, the normalised drift rate $|{\rm DR_{\rm obs}}|/ν_{\rm mean}$ is $\sim10^{-2}$ per ms, where $ν_{\rm mean}$ is the central frequency of the radio pulses. The corresponding radius of the shocked shell is, therefore, in the range of $10^{10}$ cm and $10^{11}$ cm. This implies that, for an outflow consisting of hydrogen ion, the upper limit on the mass of the relativistic shocks is a few $\times~10^{-10}~M_\odot$, which is considerably low compared to that ejected from SGR 1806-20 during the 2004 outburst.
description: 5 pages, 4 figures, Accepted in MNRAS Letters
On the Fundamental Plane of the Galactic Globular Cluster System
Creators: name: Pasquato, M.
name: Bertin, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The globular clusters (GC) of our Galaxy have been found to lie close to a plane in the log(R_e), log(sigma), SB_e space, on the continuation of the Fundamental Plane (FP) known to characterize the properties of early-type galaxies. We reexamine the issue on a sample of 48 GCs selected in terms of homogeneity criteria for the photometric data available from the literature and perform a model-independent analysis of surface brightness profiles (SBP) and distance moduli, estimating error bars and studying selection effects with non-parametric statistical tests. We determine the coefficients of the FP and their error bars. The scatter from the FP relation is likely to be intrinsic, i.e. not due to measurement errors only. We find that in the standard FP coordinates our sample occupies a slim, axisymmetric region of parameter space, suggesting that the scaling relation might be around a Fundamental Line, rather than a plane, confirming a result noted earlier. This is likely to be the origin of the difficulties in the fit by a plane mentioned in previous investigations. Such FL relation would imply a pure photometric scaling law, which might be tested on wider samples and on extra-galactic GC systems. We find a correlation of the residuals from the FP relation with the central slope of the SBP. No other correlations are found. Finally, we reconstruct the distribution of the values of the quantity log(K_V/(M/L)) (virial coefficient divided by the mass-to-light ratio) through kernel density estimation and find evidence for bimodality, which suggests that the galactic GC system may be composed of at least two dynamically different populations. Yet, these populations do not reflect the standard dichotomy between disk and halo clusters. (abridged).
description: 11 pages, 4 figures, accepted for publication in A&A, no boldface text
Photon distillation schemes with reduced resource costs based on multiphoton Fourier interference
Creators: name: Somhorst, F. H. B.
name: Sauër, B. K.
name: Hoven, S. N. van den
name: Renema, J. J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a scalable scheme to achieve photon distillation, i.e. the preparation of a single photon with reduced indistinguishability error out of multiple imperfect photons, based on multiphoton interference in Fourier matrices. Our scheme achieves arbitrary error reduction in a single step, removing the need to concatenate multiple rounds of the protocol. Our scheme has resource costs linear in the error reduction, and a constant probability of success for arbitrary error reductions. We find that the scheme both raises the threshold of error correcting codes in photonic quantum computers, as well as reduces the resources required to construct a photonic quantum computer, making it highly promising for implementation in such devices.
description: Accepted version. Related work in arXiv:2404.14217
Optimal Allocation Method of Residential Air-Conditioners: Trade-Off Solutions Between Economic Costs and Aggregation Reliability
Creators: Rushuai Han
Qinran Hu
Zishan Guo
Xiangjun Quan
Zaijun Wu
and Renjie Hu
Publisher: name: IEEE
Year: 2022

This paper proposes an economical and reliable allocation method of residential air-conditioner resources.
As the penetration of renewable energy resources increases, their intrinsic uncertainty and randomness raise significant concerns about the grid's reliability. With the development of information technologies, residential air-conditioners serve increasing services, including secondary frequency regulation, peak load shaving, and capacity reserve. However, these resources can hardly be allocated economically and reliably. On the one hand, it is unrealistic to provide advanced and expensive control modes for all AC units due to the limited investment cost. On the other hand, the uncertainty of residents' behavior varying with control modes affects the reliability. Few previous works effectively make a trade-off between economics and reliability, which restricts the value of residential air-conditioners. Thus, this paper proposed an economical and reliable allocation method based on a real survey dataset and the online learning multi-armed bandits framework. This method explores the inherent relationship between the allocation plan's economics and reliability. We also propose an allocation model which enables system operators to design an economic and reliable plan for each residential area considering ancillary services requirements. A case study in a modified IEEE 9 nodes system illustrates the effectiveness of the proposed method.