cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Observation of a Universal Aggregation Mechanism and a Possible Phase Transition in Au Sputtered by Swift Heavy Ions
Creators: name: Kuiri, P. K.
name: Joseph, B.
name: Lenka, H. P.
name: Sahu, G.
name: Ghatak, J.
name: Kanjilal, D.
name: Mahapatra, D. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Two exponents, $δ$, for size distribution of $n$-atom clusters, $Y(n)\sim n^{-δ}$, have been found in Au clusters sputtered from embedded Au nanoparticles under swift heavy ion irradiation. For small clusters, below 12.5 nm in size, $δ$ has been found to be 3/2, which can be rationalized as occurring from a steady state aggregation process with size independent aggregation. For larger clusters, a $δ$ value of 7/2 is suggested, which might come from a dynamical transition to another steady state where aggregation and evaporation rates are size dependent. In the present case, the observed decay exponents do not support any possibility of a thermodynamic liquid-gas type phase transition taking place, resulting in cluster formation.
description: 4 pages, 3 figures
The Sphakia Survey: Publications
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430307
subject: Environmental history

description: List of publications arising from the Sphakia Survey project.
Compatibility of subsystem states and convex geometry
Creators: name: Hall, William
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The subsystem compatibility problem, which concerns the question of whether a set of subsystem states are compatible with a state of the entire system, has received much study. Here we attack the problem from a new angle, utilising the ideas of convexity that have been successfully employed against the separability problem. Analogously to an entanglement witness, we introduce the idea of a compatibility witness, and prove a number of properties about these objects. We show that the subsystem compatibility problem can be solved numerically and efficiently using semidefinite programming, and that the numerical results from this solution can be used to extract exact analytic results, an idea which we use to disprove a conjecture about the subsystem problem made by Butterley et al. [Found. Phys. 36 83 (2006)]. Finally, we consider how the ideas can be used to tackle some important variants of the compatibility problem; in particular, the case of identical particles (known as N-representability in the case of fermions) is considered.
description: 12 pages APS format, some minor changes made
Amidst the Online Learning: The Personality Traits and its Relationship to the Self-Esteem of Filipino Tertiary Students
Creators: name: Tus, Jhoselle
Publisher: name: figshare
Year: 2021
Subjects: subject: Developmental and Educational Psychology
subject: 130305 Educational Counselling
subject: FOS: Educational sciences
subject: 170103 Educational Psychology
subject: FOS: Psychology
subject: Education
subject: 130101 Continuing and Community Education
subject: 160809 Sociology of Education
subject: FOS: Sociology
subject: 130103 Higher Education

description: This study investigates the relationship between personality traits and self-esteem among 612 Filipino tertiary students. The statistical findings revealed a significant positive correlation between personality traits and self-esteem. Moreover, this study indicates that personality traits are linked to an individual's life in every domain, which serves the purpose of this study. It highlights how individual differences can account for the connections between self-esteem and the personality traits.
Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3
Creators: name: Goto, Kenji
name: Fujisawa, Masashi
name: Tanaka, Hidekazu
name: Uwatoko, Yoshiya
name: Oosawa, Akira
name: Osakabe, Toyotaka
name: Kakurai, Kazuhisa
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Magnetization and neutron elastic scattering measurements under a hydrostatic pressure were performed on KCuCl3, which is a three-dimensionally coupled spin dimer system with a gapped ground state. It was found that an intradimer interaction decreases with increasing pressure, while the sum of interdimer interactions increases. This leads to the shrinkage of spin gap. A quantum phase transition from a gapped state to an antiferromagnetic state occurs at Pc ? 8.2 kbar. For P > P c, magnetic Bragg reflections were observed at reciprocal lattice points equivalent to those for the lowest magnetic excitation at zero pressure. This confirms that the spin gap decreases and closes under applied pressure.
description: 7 pages, 10 figures, submitted to J. Phys. Soc. Jpn
Ultra-Broadband Coherent Detection Enabled by DSP Enhanced 100 GHz Coherent Receiver
Creators: name: Emmerich, Robert
name: Schmidt-Langhorst, Carsten
name: Elschner, Robert
name: Erkılınç, M. Sezer
name: Colja Schubert
Publisher: name: Zenodo
Year: 2019
Subjects: Coherent Detection, Coherent Receiver, DSP, 100 GHz , Ultra-Broadband, Broadband

description: One option to improve the data rate per channel for next generation coherent transport systems is to increase the symbol rate per channel and/- or the combination of multiple channels operating at lower symbol rates forming a super-channel offering higher throughput. In any case, the resulting signals require new receiver designs, implementations and solutions. In this work, we first analyze theoretical requirements upon designing an ultra‑broadband coherent receiver and relate the results to practical constraints. Next, we experimentally investigate a prototype implementation of a 100‑GHz coherent receiver by measuring the bit error ratio (BER) performance of up to three simultaneously received 64‑gigabaud (GBd) channels with 16-ary quadrature-amplitude modulation (16‑QAM) and 64‑QAM signals. In order to improve the performance of the broadband receiver, a digital signal processing (DSP) enhancement technique based on a calibration measurement is presented, by which the frequency dependent amplitude response as well as the frequency dependent 90° phase deviation is corrected for. Finally, we briefly discuss an alternative approach to detect such broadband signals by employing a frequency stitching method using multiple low-bandwidth, yet real-time, coherent receivers.
Comparative transcriptome analysis reveals key epigenetic targets in SARS-CoV-2 infection
Creators: name: Salgado-Albarran, Marisol
name: Navarro-Delgado, Erick I.
name: Del Moral-Morales, Aylin
name: Alcaraz, Nicolas
name: Baumbach, Jan
name: Gonzalez-Barrios, Rodrigo
name: Soto-Reyes, Ernesto
Publisher: name: arXiv
Year: 2020
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: COVID-19 is an infection caused by SARS-CoV-2 (Severe Acute Respiratory Syndrome coronavirus 2), which has caused a global outbreak. Current research efforts are focused on the understanding of the molecular mechanisms involved in SARS-CoV-2 infection in order to propose drug-based therapeutic options. Transcriptional changes due to epigenetic regulation are key host cell responses to viral infection and have been studied in SARS-CoV and MERS-CoV; however, such changes are not fully described for SARS-CoV-2. In this study, we analyzed multiple transcriptomes obtained from cell lines infected with MERS-CoV, SARS-CoV and SARS-CoV-2, and from COVID-19 patient-derived samples. Using integrative analyses of gene co-expression networks and de-novo pathway enrichment, we characterize different gene modules and protein pathways enriched with Transcription Factors or Epifactors relevant for SARS-CoV-2 infection. We identified EP300, MOV10, RELA and TRIM25 as top candidates, and more than 60 additional proteins involved in the epigenetic response during viral infection that have therapeutic potential. Our results show that targeting the epigenetic machinery could be a feasible alternative to treat COVID-19.
description: 33 pages, 2 tables, 5 figures, 4 supplementary figures
Hysteresis phenomena at ultrathin lubricant film melting in the case of first-order phase transition
Creators: name: Khomenko, A. V.
name: Lyashenko, I. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Within the framework of Lorentz model for description of viscoelastic medium the influence of deformational defect of the shear modulus is studied on melting of ultrathin lubricant film confined between the atomically flat solid surfaces. The possibility of jump-like and continuous melting is shown. Three modes of lubricant behavior are found, which correspond to the zero shear stress, the Hooke section of loading diagram, and the domain of plastic flow. Transition between these modes can take place according to mechanisms of first-order and second-order phase transitions. Hysteresis of dependences of stationary stresses on strain and friction surfaces temperature is described. Phase kinetics of the system is investigated. It is shown that ratio of the relaxation times for the studied quantities influences qualitatively on the character of the stationary mode setting.
description: 13 pages, 6 figures, LaTeX
Evolved Massive Stars at Low-metallicity IV. Using 1.6 $μ$m "H-bump" to identify red supergiant stars: a case study of NGC 6822
Creators: name: Yang, Ming
name: Bonanos, Alceste Z.
name: Jiang, Biwei
name: Lam, Man I
name: Gao, Jian
name: Gavras, Panagiotis
name: Maravelias, Grigoris
name: Wang, Shu
name: Chen, Xiao-Dian
name: Tramper, Frank
name: Ren, Yi
name: Spetsieri, Zoi T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a case study of using a novel method to identify red supergiant (RSG) candidates in NGC 6822, based on their 1.6 $μ$m "H-bump". We collected 32 bands of photometric data for NGC 6822 ranging from optical to MIR. By using the theoretical spectra from MARCS, we demonstrate that there is a prominent difference around 1.6 $μ$m ("H-bump") between low-surface-gravity (LSG) and high-surface-gravity (HSG) targets. Taking advantage of this feature, we identify efficient color-color diagrams (CCDs) of rzH and rzK to separate HSG and LSG targets from crossmatching of optical and NIR data. Moreover, synthetic photometry from ATLAS9 also give similar results. Further separating RSG candidates from the rest of the LSG candidates is done by using semi-empirical criteria on NIR CMDs and resulted in 323 RSG candidates. Meanwhile, the simulation of foreground stars from Besançon models also indicates that our selection criteria is largely free from the contamination of Galactic giants. In addition to the "H-bump" method, we also use the traditional BVR method as a comparison and/or supplement, by applying a slightly aggressive cut to select as much as possible RSG candidates (358 targets). Furthermore, the Gaia astrometric solution is used to constrain the sample, where 181 and 193 targets were selected from the "H-bump" and BVR method, respectively. The percentages of selected targets in both methods are similar as $\sim$60\%, indicating the comparable accuracy of the two methods. In total, there are 234 RSG candidates after combining targets from both methods with 140 ($\sim$60\%) of them in common. The final RSG candidates are in the expected locations on the MIR CMDs, while the spatial distribution is also coincident with the FUV-selected star formation regions, suggesting the selection is reasonable and reliable.
description: A&A accepted
Asymptotic and numerical analysis of the Allen-Cahn equation with a mass constraint
Creators: name: Stafford, Douglas James
Publisher: name: University of British Columbia
Year: 2009

description: The Allen-Cahn equation with a mass constraint is analyzed asymptotically and numerically in a two-dimensional domain. This problem models the phase separation of a binary mixture in the presence of a mass constraint. Solutions develop internal layers, or interfaces, that propagate depending on the curvature of the interfaces while keeping the area they enclose constant. Small interfaces attached to the boundary of the domain are shown to move along the boundary in the direction of increasing boundary curvature. The motion of the interfaces is simulated numerically to verify these asymptotic results. The slow motion behavior of a semi-circular interface intersecting aflat boundary segment is also analyzed. The projection method is used to derive an explicit ordinary differential equation for the location of the center of such a semi-circular interface.
Aggregating Dependent Gaussian Experts in Local Approximation
Creators: name: Jalali, Hamed
name: Kasneci, Gjergji
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Distributed Gaussian processes (DGPs) are prominent local approximation methods to scale Gaussian processes (GPs) to large datasets. Instead of a global estimation, they train local experts by dividing the training set into subsets, thus reducing the time complexity. This strategy is based on the conditional independence assumption, which basically means that there is a perfect diversity between the local experts. In practice, however, this assumption is often violated, and the aggregation of experts leads to sub-optimal and inconsistent solutions. In this paper, we propose a novel approach for aggregating the Gaussian experts by detecting strong violations of conditional independence. The dependency between experts is determined by using a Gaussian graphical model, which yields the precision matrix. The precision matrix encodes conditional dependencies between experts and is used to detect strongly dependent experts and construct an improved aggregation. Using both synthetic and real datasets, our experimental evaluations illustrate that our new method outperforms other state-of-the-art (SOTA) DGP approaches while being substantially more time-efficient than SOTA approaches, which build on independent experts.
description: 8 pages
Letter from the Manager of the Royal Bank of Canada in Vernon, B.C., to the Rainbow Ranche, November 15, 1910
Creators: name: Canada, Royal Bank Of
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to the Rainbow Ranche from the manager of the Royal Bank of Canada in Vernon, B.C., dated November 15, 1910, regarding an agreement for sale Maddock Bros Laura Hoover.
New overlap construction of Weyl fermions
Creators: name: Gattringer, Christof
name: Pak, Markus
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent article Hasenfratz and von Allmen have suggested a fixed point action for two flavors of Weyl fermions on the lattice with gauge group SU(2). The block-spin transformation they use maps the chiral and vector symmetries of the underlying vector theory onto two equations of the Ginsparg-Wilson (GW) type. We show that an overlap Dirac operator can be constructed which solves both GW equations simultaneously. We discuss the properties of this overlap operator and its projection onto lattice Weyl fermions which seems to be free of artefacts, in particular the projection operators are independent of the gauge field.
description: Abstract extended; Version to appear in Nuclear Physics B
Springs Historical Society Canoe Race Account Book, 1982
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1982
Subjects: Springs
East Hampton
Rowing races
Canoes
Boats
Regattas
Account books

description: This account book shows contacts and participants of the Springs Historical Society's annual Canoe Races from 1982 to1985.
description: This material was lent to the Long Island Collection by the Springs Historical Society Library for digitization purposes.
Exotic Magnetic and Electronic Properties of Layered CrI3 Single Crystals Under High Pressure
Creators: name: Ghosh, Anirudha
name: Singh, D.
name: Mu, Qingge
name: Kvashnin, Y.
name: Haider, G.
name: Jonak, M.
name: Chareev, D.
name: Aramaki, T.
name: Medvedev, S. A.
name: Klingeler, R.
name: Mito, M.
name: Abdul-Hafidh, E. H.
name: Vejpravova, J.
name: Kalbac, M.
name: Ahuja, R.
name: Eriksson, Olle
name: Abdel-Hafiez, Mahmoud
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Through advanced experimental techniques on CrI$_{3}$ single crystals, we derive a previously not discussed pressure-temperature phase diagram. We find that $T_{c}$ increases to $\sim$ 66\,K with pressure up to $\sim$ 3\,GPa followed by a decrease to $\sim$ 10\,K at 21.2\,GPa. The experimental results are reproduced by theoretical calculations based on density functional theory where electron-electron interactions are treated by a static on-site Hubbard U on Cr 3$d$ orbitals. The origin of the pressure induced reduction of the ordering temperature is associated with a decrease of the calculated bond angle, from 95$^{\circ}$ at ambient pressure to $\sim$ 85$^{\circ}$ at 25\,GPa. Above 22\,GPa, the magnetically ordered state is essentially quenched, possibly driving the system to a Kitaev spin-liquid state at low temperature, thereby opening up the possibility of further exploration of long-range quantum entanglement between spins. The pressure-induced semiconductor-to-metal phase transition was revealed by high-pressure resistivity that is accompanied by a transition from a robust ferromagnetic state to gradually more dominating anti-ferromagnetic interactions and was consistent with theoretical modeling.
The role of choline metabolism in peripheral nervous system myelination
Creators: name: Insinga, Alysha
Publisher: name: No Publisher Supplied
Year: 2021

description: Myelination of axons increases the efficiency of the nervous system by increasing the conductivity of the action potentials. Peripheral demyelinating diseases are prevalent disorders caused by impairments in Schwann cell myelination with no currently available cure. The objective of this thesis is to describe the role of choline metabolism in peripheral nervous system myelination. The myelin sheath is comprised of a large percentage of phospholipids and choline is the major precursor to many of its lipid components. The choline-phosphatidylcholine pathway generates phosphoinositide which important in lipid biosynthesis as well as intracellular signaling and endomembrane trafficking. The imbalance of phosphoinositide levels, particularly PI(3,5)P2, has been implicated in abnormal myelin formation. In fact, pathways regulating phosphoinositide levels are impaired in multiple peripheral demyelinating diseases underscoring the importance of understanding the role of choline metabolism in Schwann cell myelination. Choline also has regulatory effects on DNA and histone methylations, making it an important component for epigenetic modifications in Schwann cells. By gaining a better understanding of the molecular mechanisms that contribute to demyelinating disorders, specifically related to choline metabolism, we can develop effective therapeutic treatments.
1988. L. Nixon, J. Moody, O. Rackham, 'Archaeological Survey in Sphakia, Crete', Echos du monde classique/Classical Views (EMC/CV) 32 n.s. 7: 157-73.
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430307
subject: Environmental history

description: 1988. L. Nixon, J. Moody, O. Rackham, 'Archaeological Survey in Sphakia, Crete', Echos du monde classique/Classical Views (EMC/CV) 32 n.s. 7: 157-73. Copy from original Sphakia Survey website.
Tunneling through triple quantum dots with mirror symmetry
Creators: name: Kuzmenko, T.
name: Kikoin, K.
name: Avishai, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Indirect exchange interaction between itinerant electrons and nano-structures with non-trivial geometrical configurations manifests a plethora of unexpected results. These configurations can be realized either in quantum dots with several potential valleys or in real complex molecules with strong correlations. Here we demonstrate that the Kondo effect may be suppressed under certain conditions in triple quantum dots with mirror symmetry at odd electron occupation. First, we show that the indirect exchange has ferromagnetic sign in the ground state of triple quantum dot in a two-terminal cross geometry for electron occupation N=3. Second, we show that for electron occupation N=1 in three-terminal fork geometry the zero-bias anomaly in the tunnel conductance is absent (despite the presence of Kondo screening) due to special symmetry of the dot wave function.
description: 8 two-column pages
1989. L. Nixon, J. Moody, S. Price, O. Rackham, 'Archaeological Survey in Sphakia, Crete', EMC/CV 33 n.s. 8: 201-15.
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430307
subject: Environmental history

description: 1989. L. Nixon, J. Moody, S. Price, O. Rackham, 'Archaeological Survey in Sphakia, Crete', EMC/CV 33 n.s. 8: 201-15. Coped from original Sphakia Survey website.
The axion dark matter echo: a detailed analysis
Creators: name: Arza, Ariel
name: Todarello, Elisa
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: It was recently shown that a powerful beam of radio/microwave radiation sent out to space can produce detectable back-scattering via the stimulated decay of ambient axion dark matter. This echo is a faint and narrow signal centered at an angular frequency close to half the axion mass. In this article, we provide a detailed analytical and numerical analysis of this signal, considering the effects of the axion velocity distribution as well as the outgoing beam shape. In agreement with the original proposal, we find that the divergence of the outgoing beam does not affect the echo signal, which is only constrained by the axion velocity distribution. Moreover, our findings are relevant for the optimization of the experimental parameters in order to attain maximal signal to noise or minimal energy consumption.
description: Matches published version
Towards observational constraints on negative (1+z)^4 type contribution in the Friedmann equation
Creators: name: Godlowski, Wlodzimierz
name: Szydlowski, Marek
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss certain issues related to the limitations of density parameters for a ``radiation''-like contribution to the Friedmann equation using kinematical or geometrical measurements. We analyse the observational constraint of a negative $(1+z)^4$-type contribution in cosmological models. We argue that it is not possible to determine the energy densities of individual components of matter scaling like radiation from astronomical observations. We find three different interpretations of the presence of the radiation term: 1) the FRW universe filled with a massless scalar field in a quantum regime (the Casimir effect), 2) the Friedmann-Robertson-Walker (FRW) model in the Randall Sundrum scenario with dark radiation, 3) the cosmological model with global rotation. From supernovae type Ia (SNIa) data, Fanaroff-Riley type IIb (FRIIb) radio galaxy (RG) data, baryon oscillation peak and cosmic microwave background radiation (CMBR) observations we obtain bounds for the negative radiation-like term. A small negative contribution of dark radiation can reconcile the tension in nucleosynthesis and remove also the disagreement between $H_0$ values obtained from both SNIa and the Wilkinson Microwave Anisotropy Probe (WMAP) satellite data.
description: 10 pages, 2 figures, final PLB accepted version
Time evolution of a mean-field generalized contact process
Creators: name: Chariker, Logan
name: Lebowitz, Joel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We investigate the macroscopic time evolution and stationary states of a mean field generalized contact process in $\mathbb{R}^d$. The model is described by a coupled set of nonlinear integral-differential equations. It was inspired by a model of neurons with discrete voltages evolving by a stochastic integrate and fire mechanism. We obtain a complete solution in the spatially uniform case and partial solutions in the general case. The system has one or more fixed points and also traveling wave solutions.
description: 20 pages, 2 figures
Wie weit können wir gehen? Praktische Fragen im Interreligiösen Dialog
Creators: name: Rimestad, Claudia
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 65 Nr. 2 (2016): Ökumenische Rundschau, Band 65, Heft 2
Global hyperbolicity and Palais-Smale condition for action functionals in stationary spacetimes
Creators: name: Candela, Anna Maria
name: Flores, Jose' Luis
name: Sanchez, Miguel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C22, 58E10, 53C50, 53C80, 58E05

description: In order to apply variational methods to the action functional for geodesics of a stationary spacetime, some hypotheses, useful to obtain classical Palais-Smale condition, are commonly used: pseudo-coercivity, bounds on certain coefficients of the metric, etc. We prove that these technical assumptions admit a natural interpretation for the conformal structure (causality) of the manifold. As a consequence, any stationary spacetime with a complete timelike Killing vector field and a complete Cauchy hypersurface (thus, globally hyperbolic), is proved to be geodesically connected.
Evolution of Unmagnetized and Magnetized Shear Layers
Creators: name: Palotti, M. L.
name: Heitsch, F.
name: Zweibel, E. G.
name: Huang, Y. -M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present numerical simulations of the growth and saturation of the Kelvin-Helmholtz instability in a compressible fluid layer with and without a weak magnetic field. In the absence of a magnetic field, the instability generates a single eddy which flattens the velocity profile, stabilizing it against further perturbations. Adding a weak magnetic field - weak in the sense that it has almost no effect on the linear instability - leads to a complex flow morphology driven by MHD forces and to enhanced broadening of the layer, due to Maxwell stresses. We corroborate earlier studies which showed that magnetic fields destroy the large scale eddy structure through periodic cycles of windup and resistive decay, but we show that the rate of decay decreases with decreasing plasma resistivity, at least within the range of resistivity accessible to our simulations. Magnetization increases the efficiency of momentum transport, and the transport increases with decreasing resistivity.
description: 17 pages, 14 figures, to be published in ApJ April 20, 2008, v677n2
Search and Rescue with Airborne Optical Sectioning
Creators: name: Schedl, David C.
name: Kurmi, Indrajit
name: Bimber, Oliver
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: I.2.10; I.4.1
subject: 68T07, 68T45

description: We show that automated person detection under occlusion conditions can be significantly improved by combining multi-perspective images before classification. Here, we employed image integration by Airborne Optical Sectioning (AOS)---a synthetic aperture imaging technique that uses camera drones to capture unstructured thermal light fields---to achieve this with a precision/recall of 96/93%. Finding lost or injured people in dense forests is not generally feasible with thermal recordings, but becomes practical with use of AOS integral images. Our findings lay the foundation for effective future search and rescue technologies that can be applied in combination with autonomous or manned aircraft. They can also be beneficial for other fields that currently suffer from inaccurate classification of partially occluded people, animals, or objects.
description: 11 pages, 5 figures, 3 tables, Nature Machine Intelligence (under review)
Selection Rules for One- and Two-Photon Absorption by Excitons in Carbon Nanotubes
Creators: name: Barros, Eduardo B.
name: Capaz, Rodrigo. B.
name: Jorio, Ado
name: Samsonidze, Georgii G.
name: Filho, Antonio G. Souza
name: Ismail-Beigi, Sohrab
name: Spataru, Catalin D.
name: Louie, Steven G.
name: Dresselhaus, Gene
name: Dresselhaus, Mildred S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent optical absorption/emission experiments showed that the lower energy optical transitions in carbon nanotubes are excitonic in nature, as predicted by theory. These experiments were based on the symmetry aspects of free electron-hole states and bound excitonic states. The present work shows, however, that group theory does not predict the selection rules needed to explain the two photon experiments. We obtain the symmetries and selection rules for the optical transitions of excitons in single-wall carbon nanotubes within the approach of the group of the wavevector, thus providing important information for the interpretation of theoretical and experimental optical spectra of these materials.
description: 4 pages, 1 figure, 1 table
Dolichogenidea coniferoides
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea coniferoides

description: D. coniferoides (Papp, 1972): Ovipositor sheath much shorter (less than 0.5 times) than metatibia. Probably this species is better placed within Pholetesor.
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 171, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
Entanglement in descendants
Creators: name: Chowdhury, Barsha G.
name: David, Justin R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the single interval entanglement and relative entropies of conformal descendants in 2d CFT. Descendants contain non-trivial entanglement, though the entanglement entropy of the canonical primary in the free boson CFT contains no additional entanglement compared to the vacuum, we show that the entanglement entropy of the state created by its level one descendant is non-trivial and is identical to that of the $U(1)$ current in this theory. We determine the first sub-leading corrections to the short interval expansion of the entanglement entropy of descendants in a general CFT from their four point function on the n-sheeted plane. We show that these corrections are determined by multiplying squares of appropriate dressing factors to the corresponding corrections of the primary. Relative entropy between descendants of the same primary is proportional to the square of the difference of their dressing factors. We apply our results to a class of descendants of generalized free fields and descendants of the vacuum and show that their dressing factors are universal.
description: 58 pages, 7 figures
A theoretical model for the separated flow around an accelerating flat plate using time-dependent self similarity
Creators: name: DeVoria, A. C.
name: Mohseni, K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present a model appropriate to the initial motion (2-3 chords of travel) of a flat-plate airfoil accelerating in an inviscid fluid. The separated flow structures are represented as vortex sheets in the conventional manner and similarity expansions locally applicable to the leading and trailing edges of the plate are developed. The topological character of vortex sheets is maintained rather than resorting to point vortex discretizations. Beyond this, there are two theoretical novelties to our approach as compared to previous studies. First, an expansion is applied to the attached outer flow rather than the vortex sheet circulations and positions. This allows the asymmetric effect of the sweeping component of the free-stream flow parallel to the plate to be built-in to the same governing equation as the singular-order flow. Second, we develop a time-dependent self similarity procedure that allows the modeling of more complex evolution of the flow structures. This is accomplished through an implicit time variation of the similarity variables. As a collective result, the predicted vortex dynamics and forces on the plate compare favorably to Navier-Stokes simulations. Lastly, the model is utilized to provide some new intuition about the separated flow at the leading edge.
Discovering supernova-produced dark matter with directional detectors
Creators: name: Baracchini, Elisabetta
name: DeRocco, William
name: Dho, Giorgio
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Supernovae can produce vast fluxes of new particles with masses on the MeV scale, a mass scale of interest for models of light dark matter. When these new particles become diffusively trapped within the supernova, the escaping flux will emerge semirelativistic with an order-one spread in velocities. As a result, overlapping emissions from Galactic supernovae will produce an overall flux of these particles at Earth that is approximately constant in time. However, this flux is highly anisotropic and is steeply peaked towards the Galactic center. This is in contrast with the cosmological abundance of a WIMP-like dark matter which, due to the rotation of the Galaxy, appears to come from the direction of the Cygnus constellation. In this paper, we demonstrate the need for a directional detector to efficiently discriminate between a signal from a cold cosmological abundance of GeV-scale WIMPs and a signal from a hot population of supernova-produced MeV-scale dark matter.
description: 15 pages, 4 figures
Are there radio-loud and radio-quiet Gamma-Ray Bursts?
Creators: name: Osborne, Joshua Alexander
name: Bagheri, Fatemeh
name: Shahmoradi, Amir
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The potential existence of two separate classes of Long-duration Gamma-Ray Bursts (LGRBs) with and without radio afterglow emission, corresponding to radio-bright/loud and radio-dark/quiet populations, has been recently argued and favored in the GRB literature. The radio-quiet LGRBs have been found to have, on average, lower total isotropic gamma-ray emissions (Eiso) and shorter intrinsic prompt gamma-ray duration (e.g., T90z). In addition, a redshift-T90z anti-correlation has been discovered among the radio-loud LGRBs, which is reportedly missing in the radio-quiet class. Here we discuss the significance of the differences between the energetics and temporal properties of the two proposed classes of radio-loud and radio-quiet LGRBs. We show that much of the proposed evidence in support of the two distinct radio populations of LGRBs can be explained away in terms of selection effects and sample incompleteness. Our arguments are based on the recent discovery of the relatively-strong highly-significant positive correlation between the total isotropic emission (Eiso) and the intrinsic prompt duration (T90z) that is present in both populations of short-hard and long-soft GRBs, predicted, quantified, and reported for the first time by Shahmoradi (2013) and Shahmoradi and Nemiroff (2015).
Stable determination by a single measurement, scattering bound and regularity of transmission eigenfunction
Creators: name: Liu, Hongyu
name: Tsou, Chun-Hsiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, we study an inverse problem of determining the cross section of an infinitely long cylindrical-like material structure from the transverse electromagnetic scattering measurement. We establish a sharp logarithmic stability result in determining a polygonal scatterer by a single far-field measurement. The argument in establishing the stability result is localized around a corner and can be as well used to produce two highly intriguing implications for invisibility and transmission resonance in the wave scattering theory. In fact, we show that if a generic medium scatterer possesses an admissible corner on its support, then there exists a positive lower bound of the $L^2$-norm of the associated far-field pattern. For the transmission resonance, we discover a quantitative connection between the regularity of the transmission eigenfunction at a corner and its analytic or Fourier extension.
Thermodynamics of Rotating Charged Black Branes in Third Order Lovelock Gravity and the Counterterm Method
Creators: name: Dehghani, M. H.
name: Mann, R. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We generalize the quasilocal definition of the stress energy tensor of Einstein gravity to the case of third order Lovelock gravity, by introducing the surface terms that make the action well-defined. We also introduce the boundary counterterm that removes the divergences of the action and the conserved quantities of the solutions of third order Lovelock gravity with zero curvature boundary at constant $t$ and $r$. Then, we compute the charged rotating solutions of this theory in $n+1$ dimensions with a complete set of allowed rotation parameters. These charged rotating solutions present black hole solutions with two inner and outer event horizons, extreme black holes or naked singularities provided the parameters of the solutions are chosen suitable. We compute temperature, entropy, charge, electric potential, mass and angular momenta of the black hole solutions, and find that these quantities satisfy the first law of thermodynamics. We find a Smarr-type formula and perform a stability analysis by computing the heat capacity and the determinant of Hessian matrix of mass with respect to its thermodynamic variables in both the canonical and the grand-canonical ensembles, and show that the system is thermally stable. This is commensurate with the fact that there is no Hawking-Page phase transition for black objects with zero curvature horizon.
description: 19 pages, 1 figure, a few references added, typos corrected
Goal-models to support communication, planning and guiding of FAIRification
Creators: name: Bernabé, César Henrique
name: Jacobsen, Annika
name: Queralt Rosinach, Núria
name: Bonino da Silva Santos, Luiz Olavo
name: Silva Souza, Vítor E.
name: Mons, Barend
name: Roos, Marco
Publisher: name: Zenodo
Year: 2021
Subjects: FAIR Principles
Ontology
Goal Modelling

description: Implementing the FAIR principles makes data ready for efficient analysis with other data. Workflows for the process of making data FAIR (‘FAIRification’) describe how the principles can be realised. As a multidisciplinary activity, FAIRification relies on good communication with different expertise involved. However, FAIRification workflows currently do not specify methods to meet this need. We are designing a method that uses ‘goal-oriented models’ to support the FAIRification ‘objective identification’ and ‘conceptual modelling’ steps. In the former, the motivation(s) for the need for FAIR data are identified. In the latter, goal models are used to define the scope, identify important concepts and validate the resulting conceptual model. The method will also describe best practices and activities for conceptual modelling.
On the regularity of a model non-Newtonian fluid
Creators: name: Maxwell, David Aquilla
Publisher: name: University of British Columbia
Year: 2009

description: Existence and regularity of steady and unsteady solutions of a PDE describing the motion of a prototypical incompressible fluid with shear dependent viscosity are studied. The regularity theory is approached by studying the associated elliptic operator. A summary of the classical technique of difference quotients applied to non-linear elliptic systems is given by applying it to the elliptic system associated with a vector Burgers-like system. Interior regularity is proved for a general class of Stokes-like elliptic operators using a new solenoidal test function that permits the application difference quotient methods to systems with a divergence free constraint. Existence for steady solutions of the incompressible fluid PDE is proven; interior regularity follows immediately from regularity of the Stokes-like elliptic system. Existence and interior regularity for time dependent solutions are proven.
Dolichogenidea coleophorae
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea coleophorae

description: D. coleophorae (Wilkinson, 1938): Pterostigma brown; propodeum with areola completely defined by carinae, including strong transverse carinae forking around spiracles; T2 mostly smooth.
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 171, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
Magnetic properties of Hydrogenated Li and Co doped ZnO nanoparticles
Creators: name: Jayakumar, O. D.
name: Gopalakrishnan, I. K.
name: Shasikala, K.
name: Kulshreshtha, S. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The effect of hydrogenation on magnetic properties of Zn0.85Co0.05Li0.10O nanoparticles is presented. It was found that the sample hydrided at room temperature (RT) showed weak ferromagnetism (FM) while that hydrided at 400oC showed robust ferromagnetism at room temperature. In both cases reheating the sample at 400oC in air converts it back into paramagnetic state (P) completely. The characterization of samples by X-ray and electron diffraction (ED) showed that room temperature ferromagnetism observed in the samples hydrogenated at RT is intrinsic in nature whereas that observed in the samples hydrogenated at 400oC is partly due to the cobalt metal clusters.
description: 10 pages, 3 figures
Rapport II - De inzet van jeugd- en jongerenparticipatie in gemeentelijk beleid
Creators: name: Fierloos, Irene
name: te Brinke, Lysanne
name: Loeffen, Betsie
name: Osinga, Susanna
name: van Buuren, Arwin
Publisher: name: Erasmus University Rotterdam (EUR)
Year: 2024
Subjects: classificationCode: 440708
subject: Public administration

description: Betekenisvolle participatie kan een positieve invloed hebben op het welzijn van kinderen en jongeren en zorgt ervoor dat beleid beter aansluit bij hun leefwereld en behoeftes. Steeds meer gemeenten willen jeugd- en jongerenparticipatie daarom inzetten voor de ontwikkeling, uitvoering en evaluatie van beleid. In de praktijk wordt dit echter nog maar beperkt ingezet, ondanks de vele tools en aanpakken die inmiddels zijn ontwikkeld. Hoe komt dit?

Dit rapport geeft inzicht in individuele en contextuele factoren die samenhangen met de inzet van jeugd- en jongerenparticipatie (4 t/m 26 jaar) in het beleid van de gemeente Rotterdam. Ons onderzoek laat zien dat niet één factor doorslaggevend is, maar dat verschillende factoren op elkaar ingrijpen. Veel beleidsadviseurs missen een visie van bovenaf, hierdoor twijfelen zij of de inzet van participatie wel echt de bedoeling is. Het ervaren van een gebrek aan rugdekking en opvattingen over kinderen en jongeren werken koudwatervrees in de hand. Ook zijn er ongeschreven regels die beleidsadviseurs extra voorzichtig maken. Om de inzet van jeugd- en jongerenparticipatie in beleid te verbeteren is een samenhangende aanpak nodig die ingrijpt op een combinatie van factoren.
Background:
This report was written during a 2-year postdoc project of the Healthy Start Convergence (2023-2025). The aim of this postdoc project is to provide insight into the barriers and facilitators to youth participation in local policy. As part of this project, we interviewed 19 public officials at the municipality of Rotterdam. The results of these interviews are presented in this report. The project was approved by the ethical committee of the Erasmus University Rotterdam, Department of Public Administration and Sociology, reference number: ETH2223-0661.
For more information about the Healthy Start Convergence, please visit: https://convergence.nl/nl/healthy-start/.