cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The use of hybrid manufacturing in the repair and maintenance of railway lines
Creators: name: De-Becker, Daniel
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 91399 Mechanical Engineering not elsewhere classified
subject: FOS: Mechanical engineering

description: The defect repair process within the UK rail industry has seen significant improvements over the past decade with the introduction of new measurement systems and defect detection systems. Although significant work has been made on the initial defect identification, little work has been done on the process after the initial defect has been detected, with the repair process utilised by Network Rail still being an extremely manual process. This manual process generates very little traceability and transparency during and after the process has been completed. When this is compounded with the high cost of repairing and maintaining the railway infrastructure, estimated to be between €30 000 and €100 000 per km per year for a modern European railway line, there is a clear opportunity to introduce some levels of automation within the rail repair process. This need has also be reiterated by Network Rail within their welding process and development report, where they state that automation of the welding and grinding processes within the repair procedures is of paramount importance. The purpose of this thesis is to discuss the use of an automated hybrid manufacturing system to maintain and repair railway lines. The project focusses on using an industrial robotic arm to repair surface defects found on the rail head. Work has been completed on utilising hybrid manufacturing using an industrial robotic arm in order to identify the location and size of a squat defect utilising various path generation and defect detection algorithms. On identifying the size and location of the defect the defective area is removed using adaptive grinding process and subsequent path generation algorithms create a weld preparation site in line with British Standard BS15594:2009. New material is then deposited using laser scan data to generate the deposition path for the robot arm and finally the same adaptive grinding system, utilised to remove the defect, is used to remove excess material in order to match the wear pattern either side of the previously defective area. The work presented in this thesis has shown the successful implementation of an autonomous rail repair system which is capable of locally identifying squat defects using a novel detection algorithm. Furthermore, this thesis has created novel path generation algorithms which can be drive the robotic arm and along with the tool in order to complete each stage of the repair process. Finally a Novel framework was been developed in line with the repair process which describes how each subsystem operates and further defines the order of operations which is required to complete the repair process.
Entropy flow of a perfect fluid in (1+1) hydrodynamics
Creators: name: Beuf, Guillaume
name: Peschanski, Robi
name: Saridakis, Emmanuel N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the formalism of the Khalatnikov potential, we derive exact general formulae for the entropy flow dS/dy, where y is the rapidity, as a function of temperature for the (1+1) relativistic hydrodynamics of a perfect fluid. We study in particular flows dominated by a sufficiently long hydrodynamic evolution, and provide an explicit analytical solution for dS/dy. We discuss the theoretical implications of our general formulae and some phenomenological applications for heavy-ion collisions.
description: 17 pages, 2 figures, to appear in Phys.Rev.C
The feeding ecology of Neomysis mercedis Holmes in the Fraser River estuary
Creators: name: Johnston, N. Thomas
Publisher: name: University of British Columbia
Year: 2010

description: N. mercedis in the Fraser River estuary is a predator on the meiobenthos, especially harpacticoid copepods. There are no clear seasonal differences in its utilization of food resources. The consumption rate of N. mercedis feeding from natural sediments varies with body size and temperature as C = 3.81*(W**0.782)*(T**0.515), where C is the consumption rate of meiofauna in ug dry weight/animal/h, W is the mysid size in mg dry weight, and T is the temperature in degrees C. The weight dependence of the ingestion rate is identical to that of the metabolic rate but the temperature dependence is significantly lower. The mysid selectively feeds on the animal fraction of the sediments but only one-half of the ingested material (by weight) is of biological origin. In mid-April, mysid predation may result in a 12% per day mortality rate on harpacticoid copepods. Thus, mysid predation may strongly influence meiofaunal densities. The availability of food resources may contribute to the observed cessation of mysid population growth in late summer.
Universal $10^{20}$Hz stochastic gravitational waves from photon spheres of black holes
Creators: name: Saito, Kaishu
name: Soda, Jiro
name: Yoshino, Hirotaka
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that photon spheres of supermassive black holes generate high-frequency stochastic gravitational waves through the photon-graviton conversion. Remarkably, the frequency is universally determined as $m_e\sqrt{m_e /m_p} \simeq 10^{20} \text{Hz}$ in terms of the proton mass $m_p$ and the electron mass $m_e$. It turns out that the density parameter of the stochastic gravitational waves $ Ω_{ \text{gw}}$ could be $ 10^{-12}$. Since the existence of the gravitational waves from photon spheres is robust, it is worth seeking methods of detecting high-frequency gravitational waves around $10^{20}$Hz.
description: 6 pages, 2 figures
Letter from Kathleen Raine to Robin Skelton, [September 22, 1954]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: English poetry--Manuscripts
valueUri: http://id.worldcat.org/fast/912320
subject: Book industries and trade
valueUri: http://id.worldcat.org/fast/836171
subject: Platonists
valueUri: http://id.worldcat.org/fast/1066881
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Neoplatonism
valueUri: http://id.worldcat.org/fast/1035884
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Periodicals--Publishing
valueUri: http://id.worldcat.org/fast/1058100
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Philosophy
valueUri: http://id.worldcat.org/fast/1060777
subject: FOS: Philosophy, ethics and religion
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672

description: Part of a collection of correspondence from Kathleen Raine to Robin Skelton. Skelton was a British poet, academic, anthologist, and practicing Wiccan. He taught at Manchester University before emigrating to Canada in 1963, where he taught creative writing at the University of Victoria and started the literary magazine The Malahat Review. Also included are some letters to Skelton’s wife Sylvia, and his daughters. Spanning close to forty-five years, the correspondence discusses poetry, writing, and philosophy; particularly Platonism and Neoplatonism. Raine often refers to the writings of William Blake and W. B. Yeats. Many letters also mention contemporary literary figures at the time including: Herbert Read, Peter Russell, Liam Miller, and Thurairajah Tambimuttu. In this letter, Raine expresses her thoughts on a book of short stories and discusses other contemporary fiction writers.
Generalized Parton Distributions from Hadronic Observables
Creators: name: Ahmad, S.
name: Honkanen, H.
name: Liuti, S.
name: Taneja, S. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a physically motivated parametrization for the unpolarized generalized parton distributions, H and E, valid at both zero and non-zero values of the skewness variable, ζ. At ζ=0, H and E are determined using constraints from simultaneous fits of experimental data on both the nucleon elastic form factors and the deep inelastic structure functions. Lattice calculations of the higher moments constrain the parametrization at ζ> 0. Our method provides a step towards a model independent extraction of generalized distributions from the data that is alternative to the mathematical ansatz of double distributions.
description: 4 pages, 2 figures, to appear in the proceedings of DIS 2007
Three-dimensional models of metal-poor stars
Creators: name: Collet, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I present here the main results of recent realistic, 3D, hydrodynamical simulations of convection at the surface of metal-poor red giant stars. I discuss the application of these convection simulations as time-dependent, 3D, hydrodynamical model atmospheres to spectral line formation calculations and abundance analyses. The impact of 3D models on derived elemental abundances is investigated by means of a differential comparison of the line strengths predicted in 3D under the assumption of local thermodynamic equilibrium (LTE) with the results of analogous line formation calculations performed with classical, 1D, hydrostatic model atmospheres. The low surface temperatures encountered in the upper photospheric layers of 3D model atmospheres of very metal-poor stars cause spectral lines of neutral metals and molecules to appear stronger in 3D than in 1D calculations. Hence, 3D elemental abundances derived from such lines are significantly lower than estimated by analyses with 1D models. In particular, differential 3D$-$1D LTE abundances for C, N, and O derived from CH, NH, and OH lines are found to be in the range -0.5 to -1 dex. Large negative differential 3D-1D corrections to the Fe abundance are also computed for weak low-excitation neutral Fe lines. The application of metal-poor 3D models to the spectroscopic analysis of extremely iron-poor halo stars is discussed.
description: 14 pages, 8 figures, to appear in the proceedings of the conference 'A Stellar Journey' -- 23-27/June/2008, Uppsala, Sweden
Perspectives on testing fundamental physics with highly charged ions in Penning traps
Creators: name: Blaum, Klaus
name: Eliseev, Sergey
name: Sturm, Sven
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: In Penning traps electromagnetic forces are used to confine charged particles under well-controlled conditions for virtually unlimited time. Sensitive detection methods have been developed to allow observation of single stored ions. Various cooling methods can be employed to reduce the energy of the trapped particle to nearly at rest. In this review we summarize how highly charged ions offer unique possibilities for precision measurements in Penning traps. Precision atomic and nuclear masses as well as magnetic moments of bound electrons allow among others to determine fundamental constants like the mass of the electron or to perform stringent tests of fundamental interactions like bound-state quantum electrodynamics. Recent results and future perspectives in high-precision Penning-trap spectroscopy with highly charged ions will be discussed.
description: 6 figures, 1 table, 111 references
Brownian motion of a charged particle driven internally by correlated noise
Creators: name: Paraan, Francis N. C.
name: Solon, Mikhail P.
name: Esguerra, J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We give an exact solution to the generalized Langevin equation of motion of a charged Brownian particle in a uniform magnetic field that is driven internally by an exponentially-correlated stochastic force. A strong dissipation regime is described in which the ensemble-averaged fluctuations of the velocity exhibit transient oscillations that arise from memory effects. Also, we calculate generalized diffusion coefficients describing the transport of these particles and briefly discuss how they are affected by the magnetic field strength and correlation time. Our asymptotic results are extended to the general case of internal driving by correlated Gaussian stochastic forces with finite autocorrelation times.
description: 10 pages, 4 figures with subfigures, RevTeX, v2: revised
Gauge Invariant Lagrangians for Free and Interacting Higher Spin Fields. A Review of the BRST formulation
Creators: name: Fotopoulos, A.
name: Tsulaia, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give a detailed review of the construction of gauge invariant Lagrangians for free and interacting higher spin fields using the BRST approach developed over the past few years.
description: Extended version of the contribution to the volume dedicated to the 60th birthday of Prof I.L. Buchbinder; 58 pages. v2 References added, some typos fixed, a couple of clarifications added. v3 To appear in International journal of Modern Physics A (pubished version), some typos fixed, references added
Towards Collaborative Photorealistic VR Meeting Rooms
Creators: name: Schäfer, Alexander
name: Reis, Gerd
name: Stricker, Didier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: When designing 3D applications it is necessary to find a compromise between cost (e.g. money, time) and achievable realism of the virtual environment. Reusing existing assets has an impact on the uniqueness of the application and creating high quality 3D assets is very time consuming and expensive. We aim for a low cost, high quality and minimal time effort solution to create virtual environments. This paper's main contribution is a novel way of creating a virtual meeting application by utilizing augmented spherical images for photo realistic virtual environments.
การพัฒนาระบบเฝ้าสังเกตสำหรับสถานีวัดอากาศแบบเคลื่อนที่
Creators: name: นภัทร วัจนเทพินทร์
name: ปกรณ์ สมบูรณ์กิจ
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลสุวรรณภูมิ
Year: 2014
Subjects: สถานีวัดอากาศแบบเคลื่อนที่, โปรแกรมเฝ้าสังเกต, LabVIEW คอมพิวเตอร์แบบฝังตัว

description: 1, 8, วารสารวิชาการและวิจัย มทร.พระนคร
The Lived Experiences of Yoga Practice for Female Survivors of Child Sexual Abuse: An Interpretative Phenomenological Analysis
Creators: name: Sharma, Aditi
Publisher: name: University of East London
Year: 2021
Subjects: Yoga
Trauma
Child sexual abuse
Women
female

description: Childhood sexual abuse (CSA) permeates all aspects of personhood including the body. There is a surge in the interest in reviewing yoga’s potential usefulness for trauma survivors in clinical trials. However, very little research focuses on women’s perspectives who experienced CSA and have subsequently practised yoga in community settings. This study investigated six women’s lived experiences of yoga practice, mainly focusing on the helpful and unhelpful aspects of yoga that mediated their recovery. Adult women survivors with experience of movement-based yoga in a group setting for at least eight weeks in the last year were recruited. Data were collected using individual, face-to-face, and semi-structured interviews. The transcribed data were analysed using Interpretative phenomenological analysis (IPA) underpinned by constructivist ontology, phenomenological epistemology, and feminist axiology. Three emergent themes were identified- “Coming to yoga”, “Process of becoming” and “Reclaiming life”. Women’s narratives in this study illustrated that they found yoga a useful and resilience-building resource in their journey of healing. With consistent and frequent practice, they reported feeling more present, self-aware, and compassionate towards themselves. Teacher’s qualities such as fostering safety, choice and holistic focus were identified as significant mediating factors that aided this journey, whereas crowded, mixed-gender, and posture-focused practice presented challenges for some respondents. This study has the potential to help Counselling psychologists (CoP), therapists, psychologists, mental health practitioners, yoga teachers, and health professionals involved in the care of the CSA survivors in implementing an evidence-based and holistic approach that facilitates self-directed recovery of CSA survivors. Further research is needed to establish if the benefits and challenges of different aspects of practice apply to the diverse population and its potential usefulness in various phases of recovery. Also, find ways to standardize the yoga practice considering variations in the approach to ensure safe and ethical practice.
Statistical physics of cerebral embolization leading to stroke
Creators: name: Hague, J. P.
name: Chung, E. M. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We discuss the physics of embolic stroke using a minimal model of emboli moving through the cerebral arteries. Our model of the blood flow network consists of a bifurcating tree, into which we introduce particles (emboli) that halt flow on reaching a node of similar size. Flow is weighted away from blocked arteries, inducing an effective interaction between emboli. We justify the form of the flow weighting using a steady flow (Poiseuille) analysis and a more complicated nonlinear analysis. We discuss free flowing and heavily congested limits and examine the transition from free flow to congestion using numerics. The correlation time is found to increase significantly at a critical value, and a finite size scaling is carried out. An order parameter for non-equilibrium critical behavior is identified as the overlap of blockages' flow shadows. Our work shows embolic stroke to be a feature of the cerebral blood flow network on the verge of a phase transition.
description: 11 pages, 11 figures. Major rewrite including improved justification of the model and a finite size scaling
Arbeitsalltag in Corona-Zeiten: das Stimmungsbild
Creators: name: Fritschi, Tobias
Publisher: name: BFH, Departement Soziale Arbeit
Year: 2020
Subjects: H Social Sciences (General)
HD Industries. Land use. Labor
HM Sociology
HN Social history and conditions. Social problems. Social reform
HV Social pathology. Social and public welfare

description: Kurzarbeit, Homeoffice, zusätzliche Betreuungsarbeit. Die Corona-Krise krempelte den Arbeitsalltag der meisten Arbeitnehmenden komplett um. Doch welchen Effekt hatte dies auf die Arbeitsbelastung und die Befindlichkeit am Arbeitsplatz?
The 12CO/13CO isotopologue ratio of a young, isolated brown dwarf. Possibly distinct formation pathways of super-Jupiters and brown dwarfs
Creators: name: Zhang, Yapeng
name: Snellen, Ignas A. G.
name: Mollière, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Linking atmospheric characteristics of planets to their formation pathways is a central theme in the study of extrasolar planets. Although the 12C/13C isotope ratio shows little variation in the solar system, the atmosphere of a super-Jupiter was recently shown to be rich in 13CO, possibly as a result of dominant ice accretion beyond the CO snowline during its formation. In this paper we aim to measure the 12CO/13CO isotopologue ratio of a young, isolated brown dwarf. While the general atmospheric characteristics of young, low mass brown dwarfs are expected to be very similar to those of super-Jupiters, their formation pathways may be different, leading to distinct isotopologue ratios. We analyse archival K-band spectra of the L dwarf 2MASS J03552337+1133437 taken with NIRSPEC at the Keck telescope. A free retrieval analysis is applied to the data to determine the isotopologue ratio 12CO/13CO in its atmosphere. The isotopologue 13CO, is detected in the atmosphere through the cross-correlation method at a signal-to-noise of ~8.4. The detection significance is determined to be ~9.5 sigma using Bayesian model comparison between two retrieval models. We retrieve an isotopologue ratio 12CO/13CO of 97(+25/-18), marginally higher than the local interstellar standard. Its C/O ratio of ~0.56 is consistent with the solar value. Although only one super-Jupiter and one brown dwarf have now a measured 12CO/13CO ratio, it is intriguing that they are different, possibly hinting to distinct formation pathways. Albeit spectroscopic similarities, isolated brown dwarfs may experience a top-down formation via gravitational collapse, which resembles star formation, while giant exoplanets favorably form through core accretion, which potentially alters isotopologue ratios in their atmospheres depending on the material they accrete from protoplanetary disks. (abridged)
description: Accepted to A&A; 9 pages, 4 figures
Bergbaubedingte Gewässerversauerung in der Niederlausitz - Ursachen, Ausmaß und Minderungskonzepte
Creators: name: Grünewald, Uwe
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2014
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 58.2014,5 - ISSN 1439-1783
Steuergeschenke an reiche Eltern?
Creators: name: Fritschi, Tobias
Publisher: name: BFH, Departement Soziale Arbeit
Year: 2020
Subjects: H Social Sciences (General)
HJ Public Finance
HN Social history and conditions. Social problems. Social reform
HQ The family. Marriage. Woman
HV Social pathology. Social and public welfare
L Education (General)

description: Familien sollen stärker entlastet werden: Am 27. September stimmen wir darüber ab, ob der Abzug für die familienexterne Kinderbetreuung von CHF 10’100 auf 25’000 erhöht wird. Auf Antrag der CVP wurde im Rahmen der Parlamentsverhandlungen der allgemeine Kinderabzug bei der Bundessteuer von CHF 6’500 auf 10’000 erhöht. Die SP hat dagegen das Referendum ergriffen. Aus gutem Grund?
Sliding Spectrum Decomposition for Diversified Recommendation
Creators: name: Huang, Yanhua
name: Wang, Weikun
name: Zhang, Lei
name: Xu, Ruiwen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Content feed, a type of product that recommends a sequence of items for users to browse and engage with, has gained tremendous popularity among social media platforms. In this paper, we propose to study the diversity problem in such a scenario from an item sequence perspective using time series analysis techniques. We derive a method called sliding spectrum decomposition (SSD) that captures users' perception of diversity in browsing a long item sequence. We also share our experiences in designing and implementing a suitable item embedding method for accurate similarity measurement under long tail effect. Combined together, they are now fully implemented and deployed in Xiaohongshu App's production recommender system that serves the main Explore Feed product for tens of millions of users every day. We demonstrate the effectiveness and efficiency of the method through theoretical analysis, offline experiments and online A/B tests.
description: In Proceedings of the 27th ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD '21), August 14--18, 2021, Virtual Event, Singapore
Total mass density slopes of early-type galaxies using Jeans dynamical modelling at redshifts $0.29 < z < 0.55$
Creators: name: Derkenne, Caro
name: McDermid, Richard M.
name: Poci, Adriano
name: Remus, Rhea-Silvia
name: Jørgensen, Inger
name: Emsellem, Eric
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The change of the total mass density slope, $γ$, of early-type galaxies through cosmic time is a probe of evolutionary pathways. Hydrodynamical cosmological simulations show that at high redshifts density profiles of early-type galaxies were on average steep ($γ\sim -3$). As redshift approaches zero, gas-poor mergers progressively cause the total mass density slope to approach the `isothermal' slope of $γ\sim -2$. Simulations therefore predict steep density slopes at high redshifts, with little to no evolution in density slopes below $z \sim 1$. Gravitational lensing results in the same redshift range find the opposite, namely a significant trend of shallow density slopes at high redshifts, becoming steeper as redshift approaches zero. Gravitational lensing results indicate a different evolutionary mechanism for early-type galaxies than dry merging, such as continued gas accretion or off-axis mergers. At redshift zero, isothermal solutions are obtained by both simulations and dynamical modelling. This work applies the Jeans dynamical modelling technique to observations of galaxies at intermediate redshifts ($0.29 < z < 0.55 $) in order to derive density slopes to address the tension between observations and simulations. We combine two-dimensional kinematic fields from MUSE data with Hubble Space Telescope photometry. The density slopes of 90 early-type galaxies from the Frontier Fields project are presented. The total sample has a median of ${γ= -2.11 \pm 0.03}$ (standard error), in agreement with dynamical modelling studies at redshift zero. The lack of evolution in total density slopes in the past 4-6 Gyrs supports a dry merging model for early-type galaxy evolution.
description: 27 pages, 10 figures, accepted for publication in MNRAS
Arithmetical and geometrical means of generalized logarithmic and exponential functions: generalized sum and product operators
Creators: name: Arruda, Tiago Jose
name: Gonzalez, Rodrigo Silva
name: Tercariol, Cesar Augusto Sangaletti
name: Martinez, Alexandre Souto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: One-parameter generalizations of the logarithmic and exponential functions have been obtained as well as algebraic operators to retrieve extensivity. Analytical expressions for the successive applications of the sum or product operators on several values of a variable are obtained here. Applications of the above formalism are considered.
description: 5 pages, no figures
Enhanced quantum tunnelling induced by disorder
Creators: name: Heinrichs, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We reconsider the problem of the enhancement of tunnelling of a quantum particle induced by disorder of a one-dimensional tunnel barrier of length $L$, using two different approximate analytic solutions of the invariant imbedding equations of wave propagation for weak disorder. The two solutions are complementary for the detailed understanding of important aspects of numerical results on disorder-enhanced tunnelling obtained recently by Kim et al. (Phys. rev. B{\bf 77}, 024203 (2008)). In particular, we derive analytically the scaled wavenumber $(kL)$-threshold where disorder-enhanced tunnelling of an incident electron first occurs, as well as the rate of variation of the transmittance in the limit of vanishing disorder. Both quantities are in good agreement with the numerical results of Kim et al. Our non-perturbative solution of the invariant imbedding equations allows us to show that the disorder enhances both the mean conductance and the mean resistance of the barrier.
description: 10 pages
Strongly Correlated Superconductivity: a plaquette Dynamical mean field theory study
Creators: name: Haule, Kristjan
name: Kotliar, Gabriel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use cluster Dynamical Mean Field Theory to study the simplest models of correlated electrons, the Hubbard model and the t-J model. We use a plaquette embedded in a medium as a reference frame to compute and interpret the physical properties of these models. We study various observables such as electronic lifetimes, one electron spectra, optical conductivities, superconducting stiffness, and the spin response in both the normal and the superconducting state in terms of correlation functions of the embedded cluster. We find that the shortest electron lifetime occurs near optimal doping where the superconducting critical temperature is maximal. A second critical doping connected to the change of topology of the Fermi surface is also identified. The mean field theory provides a simple physical picture of three doping regimes, the underdoped, the overdoped and the optimally doped regime in terms of the physics of the quantum plaquette impurity model. We compare the plaquette Dynamical Mean Field Theory results with earlier resonating valence bond mean field theories, noting the improved description of the momentum space anisotropy of the normal state properties and the doping dependence of the coefficient of the linear temperature dependence of the superfluid density in the superconducting state.
description: 37 pages, 42 figures
MPEC 2025-G49 : 2025 GE
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 GE

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Self-assembled structures of colloidal dimers and disks on a spherical surface
Creators: name: Dlamini, Nkosinathi
name: Prestipino, Santi
name: Pellicane, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study the self-assembly on a spherical surface of a model for a binary mixture of amphiphilic dimers in the presence of guest particles via Monte Carlo (MC) computer simulation. All particles have a hard core, but one monomer of the dimer also interacts with the guest particle by means of a short-range attractive potential. We observe the formation of aggregates of various shape as a function of the composition of the mixture and of the size of guest particles. Our MC simulations are a further step towards a microscopic understanding of experiments on colloidal aggregation over curved surfaces, such as oil droplets.
description: 16 pages, 7 figures
Bottomonium masses, decay rates and scalar charge radii
Creators: name: Pandya, J N
name: Rai, Ajay Kumar
name: Vinodkumar, P C
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The masses of bottomonium s and p-states, decay constants, leptonic as well as radiative decay widths are computed in the framework of extended harmonic confinement model without any additional parameters.
description: Presented at Hadron07 at Laboratori Nazionali di Frascati during 8-13 October, 2007
Theory of superlocalized magnetic nanoparticle hyperthermia: rotating versus oscillating fields
Creators: name: Iszaly, Zs.
name: Marian, I. G.
name: Szabo, I. A.
name: Trombettoni, A.
name: Nandori, I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: The main idea of magnetic hyperthermia is to increase locally the temperature of the human body by means of injected superparamagnetic nanoparticles. They absorb energy from a time-dependent external magnetic field and transfer it into their environment. In the so-called superlocalization, the combination of an applied oscillating and a static magnetic field gradient provides even more focused heating since for large enough static field the dissipation is considerably reduced. Similar effect was found in the deterministic study of the rotating field combined with a static field gradient. Here we study theoretically the influence of thermal effects on superlocalization and on heating efficiency. We demonstrate that when time-dependent steady state motions of the magnetisation vector are present in the zero temperature limit, then deterministic and stochastic results are very similar to each other. We also show that when steady state motions are absent, the superlocalization is severely reduced by thermal effects. Our most important finding is that in the low frequency range ($ω\to 0$) suitable for hyperthermia, the oscillating applied field is shown to result in two times larger intrinsic loss power and specific absorption rate then the rotating one with identical superlocalization ability which has importance in technical realisation.
description: 20 pages, 18 figures, published in J. Magn. Magn. Mater
Supplementary Information from Neural and social correlates of attitudinal brokerage: using the complete social networks of two entire villages
Creators: name: Youm, Yoosik
name: Junsol Kim
name: Seyul Kwak
name: Jeanyung Chey
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Neuroscience
subject: 170299 Cognitive Science not elsewhere classified
subject: FOS: Psychology
subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: To avoid polarization and maintain small-worldness in society, people who act as attitudinal brokers are critical. These people maintain social ties with people who have dissimilar and even incompatible attitudes. Based on resting-state functional magnetic resonance imaging (n = 139) and the complete social networks from two Korean villages (n = 1508), we investigated the individual-level neural capacity and social-level structural opportunity for attitudinal brokerage regarding gender role attitudes. First, using a connectome-based predictive model, we successfully identified the brain functional connectivity that predicts attitudinal diversity of respondents' social network members. Brain regions that contributed most to the prediction included mentalizing regions known to be recruited in reading and understanding others’ belief states. This result was corroborated by leave-one-out cross-validation, fivefold cross-validation and external validation where the brain connectivity identified in one village was used to predict the attitudinal diversity in another independent village. Second, the association between functional connectivity and attitudinal diversity of social network members was contingent on a specific position in a social network, namely, the structural brokerage position where people have ties with two people who are not otherwise connected.
A note on the enumeration of directed animals via gas considerations
Creators: name: Albenque, Marie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 60K20, 60K35 (Primary) 68R05 (Secondary)

description: In the literature, most of the results about the enumeration of directed animals on lattices via gas considerations are obtained by a formal passage to the limit of enumeration of directed animals on cyclical versions of the lattice. Here we provide a new point of view on this phenomenon. Using the gas construction given in [Electron. J. Combin. (2007) 14 R71], we describe the gas process on the cyclical versions of the lattices as a cyclical Markov chain (roughly speaking, Markov chains conditioned to come back to their starting point). Then we introduce a notion of convergence of graphs, such that if $(G_n)\to G$ then the gas process built on $G_n$ converges in distribution to the gas process on $G$. That gives a general tool to show that gas processes related to animals enumeration are often Markovian on lines extracted from lattices. We provide examples and computations of new generating functions for directed animals with various sources on the triangular lattice, on the $\mathcal {T}_n$ lattices introduced in [Ann. Comb. 4 (2000) 269--284] and on a generalization of the $\mathcaligr {L}_n$ lattices introduced in [J. Phys. A 29 (1996) 3357--3365].
description: Published in at http://dx.doi.org/10.1214/08-AAP580 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Rapid Molecular Cloud and Star Formation: Mechanisms and Movies
Creators: name: Heitsch, Fabian
name: Hartmann, Lee
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We demonstrate that the observationally inferred rapid onset of star formation after parental molecular clouds have assembled can be achieved by flow-driven cloud formation of atomic gas, using our previous three-dimensional numerical simulations. We post-process these simulations to approximate CO formation, which allows us to investigate the times at which CO becomes abundant relative to the onset of cloud collapse. We find that global gravity in a finite cloud has two crucial effects on cloud evolution. (a) Lateral collapse (perpendicular to the flows sweeping up the cloud) leads to rapidly increasing column densities above the accumulation from the one-dimensional flow. This in turn allows fast formation of CO, allowing the molecular cloud to ``appear'' rapidly. (b) Global gravity is required to drive the dense gas to the high pressures necessary to form solar-mass cores, in support of recent analytical models of cloud fragmentation. While the clouds still appear ``supersonically turbulent'', this turbulence is relegated to playing a secondary role, in that it is to some extent a consequence of gravitational forces.
description: 12 pages, 10 figures, accepted by ApJ
Methods for Producing Decoherence-Free States and Noiseless Subsystems Using Photonic Qutrits
Creators: name: Bishop, C. Allen
name: Byrd, Mark S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We outline a proposal for a method of preparing an encoded two-state system (logical qubit) that is immune to collective noise acting on the Hilbert space of the states supporting it. The logical qubit is comprised of three photonic three-state systems (qutrits) and is generated by the process of spontaneous parametric down conversion. The states are constructed using linear optical elements along with three down-conversion sources, and are deemed successful by the simultaneous detection of six events. We also show how to select a maximally entangled state of two qutrits by similar methods. For this maximally entangled state we describe conditions for the state to be decoherence-free which do not correspond to collective errors.
description: 12 pages, 9 (color) figures, misc minor changes from referee suggestions and an added reference
Comment on "'t Hooft vertices, partial quenching, and rooted staggered QCD"
Creators: name: Creutz, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: A recent criticism of the proof of the failure of the rooting procedure with staggered fermions is shown to be incorrect.
description: 4 pages, no figures; revised version as to be published in Phys. Rev. D
First observations from the SPICE EUV spectrometer on Solar Orbiter
Creators: name: Fludra, A.
name: Caldwell, M.
name: Giunta, A.
name: Grundy, T.
name: Guest, S.
name: Leeks, S.
name: Sidher, S.
name: Auchère, F.
name: Carlsson, M.
name: Hassler, D.
name: Peter, H.
name: Cuadrado, R. Aznar
name: Buchlin, É.
name: Caminade, S.
name: DeForest, C.
name: Fredvik, T.
name: Haberreiter, M.
name: Harra, L.
name: Janvier, M.
name: Kucera, T.
name: Müller, D.
name: Parenti, S.
name: Schmutz, W.
name: Schühle, U.
name: Solanki, S. K.
name: Teriaca, L.
name: Thompson, W. T.
name: Tustain, S.
name: Williams, D.
name: Young, P. R.
name: Chitta, L. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present first science observations taken during the commissioning activities of the Spectral Imaging of the Coronal Environment (SPICE) instrument on the ESA/NASA Solar Orbiter mission. SPICE is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper we illustrate the possible types of observations to give prospective users a better understanding of the science capabilities of SPICE. The paper discusses the first observations of the Sun on different targets and presents an example of the full spectra from the quiet Sun, identifying over 40 spectral lines from neutral hydrogen and ions of carbon, oxygen, nitrogen, neon, sulphur, magnesium, and iron. These lines cover the temperature range between 20,000 K and 1 million K (10MK in flares), providing slices of the Sun's atmosphere in narrow temperature intervals. We provide a list of count rates for the 23 brightest spectral lines. We show examples of raster images of the quiet Sun in several strong transition region lines, where we have found unusually bright, compact structures in the quiet Sun network, with extreme intensities up to 25 times greater than the average intensity across the image. The lifetimes of these structures can exceed 2.5 hours. We identify them as a transition region signature of coronal bright points and compare their areas and intensity enhancements. We also show the first above-limb measurements with SPICE above the polar limb in C III, O VI, and Ne VIII lines, and far off limb measurements in the equatorial plane in Mg IX, Ne VIII, and O VI lines. We discuss the potential to use abundance diagnostics methods to study the variability of the elemental composition that can be compared with in situ measurements to help confirm the magnetic connection between the spacecraft location and the Sun's surface, and locate the sources of the solar wind.
description: 14 pages, 10 figures. Accepted for publication in A&A
MPEC 2025-G50 : 2025 GF
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 GF

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Observation of chi-b(1PJ,2PJ) decays to light hadrons
Creators: name: CLEO Collaboration
name: Asner, D. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Analyzing $Υ(nS)$ decays acquired with the CLEO detector operating at the CESR $e^+e^-$ collider, we measure for the first time the product branching fractions ${\cal B}[Υ(nS)\toγχ_{b}((n-1)P_J)] \times {\cal B}[χ_{b}(n-1)P_J)\to X_i]$ for $n=2$ and 3, where $X_i$ denotes, for each $i$, one of the fourteen exclusive light-hadron final states for which we observe significant signals in both $χ_b(1P_J)$ and $χ_b(2P_J)$ decays. We also determine upper limits for the electric dipole (E1) transitions $Υ(3S) \to γχ_b(1P_J)$.
description: 12 pages, 3 figures, submitted to Phys. Rev. D (Rapid Communications)
Прыговские находки
Creators: name: Корочкова О. Н.
name: Спиридонов И. А.
name: Стефанов В. И.
Publisher: name: Archaeoastronomy and Ancient Technologies
Year: 2017
Subjects: бронзовый век
лесостепное Притоболье
Западноазиатская (Евразийская) металлургическая провинция
случайные находки
металлические орудия
украшения

description: Публикация посвящена описанию и трактовке комплекта оригинальных изделий из меди и бронзы, найденных случайно в окрестностях деревни Прыгова в Курганской области. Обнаруженные вне археологического контекста, но в непосредственной близости от расположенных рядом многочисленных археологических объектов на большом острове в пойме реки Исеть, они не имеют однозначной интерпретации. Предварительно их можно интерпретировать как вотивные клады. Имеющиеся в составе скоплений украшения (пронизи, обоймы, бусы, створка раковины) определѐнно адресуют в поисках аналогий к культурам синташтинско-петровско-алакульской ассоциации, а оригинальные массивные клиновидные предметы сообщают о циркумпонтийском наследии в металлообработке Западноазиатской (Евразийской) металлургической провинции позднего бронзового века и дополняют представления о сортаменте местной продукции.
A Catalogue of Potential Post Common Envelope Binaries
Creators: name: Kruckow, Matthias U.
name: Neunteufel, Patrick G.
name: Di Stefano, Rosanne
name: Gao, Yan
name: Kobayashi, Chiaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a catalogue containing 839 candidate post common envelope systems. Common envelope evolution is very important in stellar astrophysics, particularly in the context of very compact and short-period binaries, including cataclysmic variables, as progenitors of e.g. supernovae type Ia or mergers of black holes and/or neutron stars. At the same time it is a barely understood process in binary evolution. Due to limitations, since partially remedied, on direct simulation, early investigations were mainly focused on providing analytic prescriptions of the outcome of common envelope evolution. In recent years, detailed hydrodynamical calculations have produced deeper insight into the previously elusive process of envelope ejection. However, a direct link between observations and theory of this relatively short-lived phase in binary evolution has not been forthcoming. Therefore, the main insight to be gained from observations has to be derived from the current state of systems likely to have gone through a common envelope. Here we present an extensive catalogue of such observations as found in the literature. The aim of this paper is to provide a reliable set of data, obtained from observations, to be used in the theoretical modelling of common envelope evolution. In this catalogue, the former common envelope donor star is commonly observed as a white dwarf star or as a hot sub-dwarf star. This catalogue includes period and mass estimates, wherever obtainable. Some binaries are border line cases to allow an investigation of the transition between a common envelope formation and other mass-transfer processes.
description: 29(+23) pages, 6(+4) figures, 1(+2) tables. Accepted for publication in APJ