cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The `Rabbit': A Potential Radio Counterpart of GeV J1417-6100
Creators: name: Roberts, Mallory S. E.
name: Romani, Roger W.
name: Johnston, Simon
name: Green, Anne J.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have mapped the radio emission in the error ellipse of GeV J1417-6100 (2EGS J1418-6049) at 13cm and 20cm using the Australia Telescope Compact Array. We find a large shell with extended wings, at the edge of which is a non-thermal, polarized structure with a center filled morphology (the `Rabbit'), coincident with an extended, hard X-ray source. We discuss the various sources seen within the ellipse as potential counterparts of the gamma-ray source. We conclude that the most likely scenario is that the Rabbit is a wind nebula surrounding a radio-quiet gamma-ray pulsar.
description: 14 pages, 6 figures, to be published in the Astrophysical Journal
title: Untersuchungen zu einem Fundkomplex der älteren Urnenfelderzeit
Creators: name: Borrmann, Tabea Rosa
Year: 2024

description: Bei Bauarbeiten an der Erdgas-Hochdruckrohrleitung DA 168 der Fernleitung Grenzlandring in Großreipersdorf in Niederösterreich konnten 1986 die Überreste einer urgeschichtlichen Siedlung dokumentiert werden. Nach Abschluss der Bauarbeiten konnten in einer vierwöchigen Grabungskampagne unter der Leitung von Barbara Wewerka mehr als 40 verschiedenzeitlich datierende Siedlungsbefunde freigelegt werden. Die vorliegende Arbeit beschäftigt sich mit der Fundstelle 1 und den darin befindlichen Verfärbungen 1 bis 3. Das Fundspektrum dieses Fundkomplexes umfasst Gefäßkeramik, darunter der einzige spätbronzezeitliche Pyraunos in Österreich, Hüttenlehm, einige Stein- und Silexfunde sowie ein Webgewichtsfragment. Darüber hinaus wurden die Inhalte von zwei Gefäßen beprobt. Das Ziel dieser Arbeit ist die chronologische Einordnung und Interpretation des Fundkomplexes. Das Hauptaugenmerk der Untersuchungen liegt hierbei auf der Gefäßkeramik, die den Großteil des Fundmaterials ausmacht. Die Grundlage für die Analyse stellt die quantitative und qualitative Auswertung der Funde dar. Hierzu zählen sowohl die technologischen Parameter der Scherben als auch die Betrachtung des Gefäßaufbaus. Die rekonstruierbare Gefäßkeramik steht dabei besonders im Fokus der Untersuchungen, da anhand von Typologie, Oberflächenbehandlung und Dekor eine chronologische Einordnung des Fundkomplexes erfolgen kann. Die Analyse der Gefäßkeramik wird durch die archäozoologischen und archäobotanischen Untersuchungen von Mag. Dr. Marjolein D. Bosch vom Österreichischen Archäologischen Institut und Maximilian Piniel M.A. vom Institut für Urgeschichte und Historische Archäologie der Universität Wien ergänzt.
Phasianus colchicus Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Galliformes
Phasianidae
Phasianus
Phasianus colchicus

description: Phasianus colchicus [spec. nov.]
P. rufus, capite caeruleo.
Phasianus. Raj. av 56. Alb. av. 1. p. 24. t. 25. 26. Olin. av. 49. Aldr. orn. l. 13. c. 5.
Habitat in Africa, Asia.
Principum mensis dicatus.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 158, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Microstructure and properties of electropulsed high carbon steel wire rod
Creators: name: Omoigiade, Osamudiamen
Publisher: name: Imperial College London
Year: 2018

description: This thesis explores the influence of pulsed electric current (electropulsing) on the microstructure and mechanical properties of high carbon wire rod steels with the aim of improving wire drawability and reducing manufacturing costs. Industrial standard wire tests and microstructural characterisation were performed alongside neutron strain scanning to assess the effects of electropulsing on drawability and microstructure. High carbon steel wires exploit the exceptional work hardening mechanisms of pearlite to produce versatile components used in high strength applications such as bridge wires and pneumatic tyre reinforcement. However, pearlite’s work hardening is a double-edged sword, as it accumulates severe strain during wire drawing and becomes prone to failure before achieving target wire diameters. To avoid premature failure, wires undergo multiple annealing and patenting steps, including intermediate patenting, which involves passing wires through a 900-1000 °C austentising furnace, forming coarse austenite, before being quenched into a ~540 °C lead bath or forced air cooled to form relatively fine pearlite. However, having coarse austenite grains compromises pearlite’s capacity to absorb energy and ductility, and as a consequence additional annealing steps are required, increasing manufacturing costs and slowing production. Previously, electropulsing has induced recovery and recrystallisation of fine grains in cold rolled single phase alpha-Ti and Cu strips at room temperature compared with their original grain size. Therefore, pulsed electric currents present an attractive alternative processing tool to alleviate strain accumulation in high carbon steel wire and promote grain refinement. Here, the capability of electropulsing to relieve residual strain in drawn wires are assessed by testing wires in torsion, tension and reverse bending at stages before and after pulsing at room temperature. The mechanical properties of the pulsed wires showed marginal increases in tensile strength but reduced ductility. Contrary to previous notions, neutron diffraction revealed observed changes in mechanical properties were due to augmented compressive strains in the (110) plane which is thought to be due to the formation of Cottrell atmospheres stabilising dislocations. To determine whether the refinement process persists in iron and at elevated temperatures, the microstructures of 5.5 mm diameter wire rods are examined in three stages of transformation: prior austenite; partially transformed pearlite nodules and fully transformed pearlite. Grain refinement of austenite was found to persist at elevated temperatures and the austenite grain size was refined by 60 % applying pulsed currents of 20 - 160 A, 100 Hz, 80 μs pulse widths with a potential of 24 V over the austenitising period of 150 seconds. This translated into generally improved ductility to failure, measuring a 10.8 % engineering strain (100 A) in comparison to 6.7 % the non-electropulsed sample.
Musculoskeletal modelling to analyse and treat anterior cruciate ligament deficiency
Creators: name: Azmi, Nur Liyana
Publisher: name: Imperial College London
Year: 2017

description: Anterior cruciate ligament (ACL) deficiency results in knee instability that includes an increase in internal tibial rotation and anterior tibial translation (ATT) as ACL is the primary restraint to anterior shear and internal rotation. Clinically, ACL deficient (ACLD) patients undergo surgery or/and rehabilitation programmes depending on their ability to cope or otherwise. However, the ACL reconstructed (ACLR) knees may still have residual instability in ATT and tibial internal rotation. Functional electrical stimulation (FES) has been used in conventional physiotherapy for ACL deficiency, including strengthening the muscles around the knee. The rehabilitation treatment focuses on strengthening the quadriceps muscle because it gets weakened after ACL injury or ACL reconstruction. However, stimulating the hamstrings, especially the biceps femoris long head (BFLH) with its insertion on the fibular head is a candidate to reduce the knee instability of ACLD and ACLR by applying a posterior pull and external rotation to the tibia. This thesis proposes that knee instability in ACLD subjects can be reduced by stimulating the BFLH muscle with FES. Here, a musculoskeletal modelling approach was used to simulate the function of FES. A new optimisation method was developed which allowed the inclusion of FES. There are three main studies present in this thesis. First, a pilot study was conducted in which healthy control subjects walked with and without FES of BFLH. It was found that selective activation of the BFLH can reduce the anterior tibial shear and tibial internal rotation torque at the knee in healthy subjects. Second, a validation study for the algorithm used in the musculoskeletal model was conducted in which the effect of FES stimulation of the BFLH on gluteus maximus activations was tested using electromyography (EMG). This study concluded that there were statistical correlations between peak and impulse of gluteus maximus activation between FES activation level and muscle activity of gluteus maximus as quantified by both EMG and the musculoskeletal model. In the final study, the validated model was used to compare the internal rotation torque, anterior shear force, speed and gluteus medius and gluteus maximus muscle activation between control, ACLD and ACLR groups during stance phase with and without FES stimulated on BFLH. This study found that the activation of BFLH with FES during stance phase was able to reduce the knee instability of the patient groups and triggered the compensatory mechanism for each patient group to react differently. Therefore, besides quadriceps, the rehabilitation treatment should focus on appropriate timed activation of the BFLH to improve the quality of life of patients.
Isogeometric analysis for second-order forms of the neutron transport equation with applications to reactor physics
Creators: name: Welch, James
Publisher: name: Imperial College London
Year: 2017

description: Development of computational methods to solve reactor physics and shielding problems has been a constant area of research since the 1940s and the Manhattan project. As technology and improved methods have been developed more detailed simulations have been possible. However, solving the neutron transport equation for full-core heterogeneous problems is still a challenging proposition, even for modern numerical methods and petaflop high performance computers. The high dimensionality of the physical problem combined with the complex geometries of reactor cores and their shields has meant that approximations in all dimensions have to be made in order to make finding a solution tractable. Such approximations include using a simple diffusion approximation and coarse geometric approximations typically discretised with polygonal finite elements. This thesis details the investigation into the application of Isogeometric Analysis (IGA) to second-order forms of the neutron transport equation with application to reactor physics and the development of a new parallel reactor physics code PIRANA. Isogeometric Analysis is a generalisation of the finite element method which uses the mathematical basis of computer aided design (CAD) for numerical analysis. By using the CAD model directly in analysis the geometry is modelled exactly with no approximation. The results of this study have found that the exact geometric representation of the IGA method can significantly improve the accuracy of solutions to the neutron transport equation compared to the finite element method. Additionally, the exact geometric representation has allowed for local refinement to be performed for non-Cartesian geometries within the analysis program which can result in a significant reduction of the computational cost. Finally, IGA allows for optimisation of the multigroup form of the neutron transport equation by solving each group on a uniquely refined spatial mesh significantly reducing the total number of spatial degrees-of- freedom for the same overall solution accuracy.
Lifetime of Surface Features and Stellar Rotation: A Wavelet Time-Frequency Approach
Creators: name: Soon, Willie
name: Frick, Peter
name: Baliunas, Sallie
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore subtle variations in disk-integrated measurements spanning $\lsim$ 18 years of stellar surface magnetism by using a newly developed time-frequency gapped wavelet algorithm. We present results based on analysis of the Mount Wilson Ca II H and K emission fluxes in four, magnetically-active stars (HD 1835 [G2V], 82885 [G8IV-V], 149661 [K0V] and 190007 [K4V]) and sensitivity tests using artificial data. When the wavelet basis is appropriately modified (i.e., when the time-frequency resolution is optimized), the results are consistent with the existence of spatially localized and long-lived Ca II features (assumed here as activity regions that tend to recur in narrowly-confined latitude bands), especially in HD 1835 and 82885. This interpretation is based on the observed persistence of relatively localized Ca II wavelet power at a narrow range of rotational time scales, enduring as long as $\gsim$ 10 years.
description: to appear in THE ASTROPHYSICAL JOURNAL LETTERS
Quantum current in dissipative systems
Creators: name: Hovhannisyan, Karen V.
name: Imparato, Alberto
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Describing current in open quantum systems can be problematic due to the subtle interplay of quantum coherence and environmental noise. Probing the noise-induced current can be detrimental to the tunneling-induced current and vice versa. We derive a general theory for the probability current in quantum systems arbitrarily interacting with their environment that overcomes this difficulty. We show that the current can be experimentally measured by performing a sequence of weak and standard quantum measurements. We exemplify our theory by analyzing a simple Smoluchowski-Feynman-type ratchet consisting of two particles, operating deep in the quantum regime. Fully incorporating both thermal and quantum effects, the current generated in the model can be used to detect the onset of "genuine quantumness" in the form of quantum contextuality. The model can also be used to generate steady-state entanglement in the presence of arbitrarily hot environment.
description: 17+14 pages, 5+3 figures; v3: title changed, new results added; close to published version
Cosmological constraints on alternative model to Chaplygin fluid revisited
Creators: name: Hernandez-Almada, A.
name: Magana, Juan
name: Garcia-Aspeitia, Miguel A.
name: Motta, V.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we explore an alternative phenomenological model to Chaplygin gas proposed by H. Hova et. al., consisting on a modification of a perfect fluid, to explain the dynamics of dark matter and dark energy at cosmological scales immerse in a flat or curved universe. Adopting properties similar to a Chaplygin gas, the proposed model is a mixture of dark matter and dark energy components parameterized by only one free parameter denoted as $μ$. We focus on contrasting this model with the most recent cosmological observations of Type Ia Supernovae and Hubble parameter measurements. Our joint analysis yields a value $μ= 0.843^{+0.014}_{-0.015}\,$ ($0.822^{+0.022}_{-0.024}$) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today $q_0=-0.67 \pm 0.02\,(-0.51\pm 0.07)$, the acceleration-deceleration transition redshift $z_t=0.57\pm 0.04\, (0.50 \pm 0.06)$, and the universe age $t_A = 13.108^{+0.270}_{-0.260}\,\times (12.314^{+0.590}_{-0.430})\,$Gyrs. We also report a best value of $Ω_k = 0.183^{+0.073}_{-0.079}$ consistent at $3σ$ with the one reported by Planck Collaboration. Our analysis confirm the results by Hova et al, this Chaplygin gas-like is a plausible alternative to explain the nature of the dark sector of the universe.
description: Accepted for publication in EPJ C
Gravitational Lensing and the Hubble Deep Field
Creators: name: Cooray, Asantha R.
name: Quashnock, Jean M.
name: Miller, M. Coleman
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate the expected number of multiply-imaged galaxies in the Hubble Deep Field (HDF), using photometric redshift information for galaxies with m_I < 27 that were detected in all four HDF passbands. A comparison of these expectations with the observed number of strongly lensed galaxies constrains the current value of Omega_m-Omega_Lambda, where Omega_m is the mean mass density of the universe and Omega_Lambda is the normalized cosmological constant. Based on current estimates of the HDF luminosity function and associated uncertainties in individual parameters, our 95% confidence lower limit on Omega_m-Omega_Lambda ranges between -0.44, if there are no strongly lensed galaxies in the HDF, and -0.73, if there are two strongly lensed galaxies in the HDF. If the only lensed galaxy in the HDF is the one presently viable candidate, then, in a flat universe (Omega_m+Omega_Lambda=1), Omega_Lambda < 0.79 (95% C.L.). These limits are compatible with estimates based on high-redshift supernovae and with previous limits based on gravitational lensing.
description: 4 pages (aipproc.sty), 2 figures. To appear in "After the dark ages: when galaxies were young," proceedings of the 9th Annual October Astrophysics Conference, eds. S. S. Holt & E. P. Smith
Neighborhood-Enhanced Supervised Contrastive Learning for Collaborative Filtering
Creators: name: Sun, Peijie
name: Wu, Le
name: Zhang, Kun
name: Chen, Xiangzhi
name: Wang, Meng
Publisher: name: arXiv
Year: 2024
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: While effective in recommendation tasks, collaborative filtering (CF) techniques face the challenge of data sparsity. Researchers have begun leveraging contrastive learning to introduce additional self-supervised signals to address this. However, this approach often unintentionally distances the target user/item from their collaborative neighbors, limiting its efficacy. In response, we propose a solution that treats the collaborative neighbors of the anchor node as positive samples within the final objective loss function. This paper focuses on developing two unique supervised contrastive loss functions that effectively combine supervision signals with contrastive loss. We analyze our proposed loss functions through the gradient lens, demonstrating that different positive samples simultaneously influence updating the anchor node's embeddings. These samples' impact depends on their similarities to the anchor node and the negative samples. Using the graph-based collaborative filtering model as our backbone and following the same data augmentation methods as the existing contrastive learning model SGL, we effectively enhance the performance of the recommendation model. Our proposed Neighborhood-Enhanced Supervised Contrastive Loss (NESCL) model substitutes the contrastive loss function in SGL with our novel loss function, showing marked performance improvement. On three real-world datasets, Yelp2018, Gowalla, and Amazon-Book, our model surpasses the original SGL by 10.09%, 7.09%, and 35.36% on NDCG@20, respectively.
Group-cluster merging and the formation of starburst galaxies
Creators: name: Bekki, Kenji
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A significant fraction of clusters of galaxies are observed to have substructure, which implies that merging between clusters and subclusters is a rather common physical process of cluster formation. It still remains unclear how cluster merging affects the evolution of cluster member galaxies. We report the results of numerical simulations, which show the dynamical evolution of a gas-rich late-type spiral in a merger between a small group of galaxies and a cluster. The simulations demonstrate that time-dependent tidal gravitational field of the merging excites non-axisymmetric structure of the galaxy, subsequently drives efficient transfer of gas to the central region, and finally triggers a secondary starburst. This result provides not only a new mechanism of starbursts but also a close physical relationship between the emergence of starburst galaxies and the formation of substructure in clusters. We accordingly interpret post-starburst galaxies located near substructure of the Coma cluster as one observational example indicating the global tidal effects of group-cluster merging. Our numerical results furthermore suggest a causal link between the observed excess of blue galaxies in distant clusters and cluster virialization process through hierarchical merging of subclusters.
description: 5 pages 3 color figures, ApJL in press
A Radio Perspective on Star-Formation in Distant Galaxies
Creators: name: Richards, Eric A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Determination of the epoch dependent star-formation rate of field galaxies is one of the principal goals of modern observational cosmology. Deep radio surveys, sensitive to starbursts out to $z \sim$ 1-2, may hold the key to understanding the evolution of the starburst phenonemon unhindered by the effects of dust. Using deep, high resolution radio observations of the Hubble Deep Field, we show that the $μ$Jy radio emission from field galaxies at $z\sim 0.4-1$ is primarily starburst in origin. In addition, we have discovered a population of optically faint, possibly obscured systems that are candidate high-$z$ protogalaxies. At least one of these radio sources is identified with a sub-mm detection.
description: 4 pages, 3 figs., paper presented at Maryland October Astrophysics Conference, 'Before the Dark Ages: When the Galaxies were Young'
title: Kryptographie durch die Jahrhunderte
Creators: name: Becker, Katharina
Year: 2024

description: Bei der Übermittlung von Nachrichten und Informationen gibt es immer Personen, die an Informationen kommen wollen, die ursprünglich nicht für sie gedacht waren. Damit Dritte nicht an geheime Informationen kommen, werden schon seit vielen Jahren Nachrichten verschlüsselt. Dazu gibt es verschiedene Methoden, die auf verschiedenen mathematischen Prinzipien aufbauen. Diese Arbeit beschäftigt sich damit, welche mathematischen Voraussetzungen für die verschiedenen Verschlüsselungsmethoden benötigt werden. Auch die Sicherheit der einzelnen Verschlüsselungen wird beleuchtet. Anhand einer Literaturrecherche wurden die Informationen zusammengetragen.
Spatial Corrections of ROSAT HRI Observations
Creators: name: Harris, D. E.
name: Silverman, J. D.
name: Hasinger, G.
name: Lehmann, I.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: X-ray observations with the ROSAT High Resolution Imager (HRI) often have spatial smearing on the order of 10 arcsec (Morse 1994). This degradation of the intrinsic resolution of the instrument (5 arcsec) can be attributed to errors in the aspect solution associated with the wobble of the space craft or with the reacquisition of the guide stars. We have developed a set of IRAF/PROS and MIDAS/EXSAS routines to minimize these effects. Our procedure attempts to isolate aspect errors that are repeated through each cycle of the wobble. The method assigns a 'wobble phase' to each event based on the 402 second period of the ROSAT wobble. The observation is grouped into a number of phase bins and a centroid is calculated for each sub-image. The corrected HRI event list is reconstructed by adding the sub-images which have been shifted to a common source position. This method has shown approx. 30% reduction of the full width half maximum (FWHM) of an X-ray observation of the radio galaxy 3C 120. Additional examples are presented.
description: AandA latex (6 pages with 7 embedded postscript figures). Scheduled for publication in the 1 Dec issue of Astron. Astrophys. Suppl. Series
HST observations of the Local Group dwarf galaxy Leo I
Creators: name: Gallart, C.
name: Freedman, W. L.
name: Mateo, M.
name: Chiosi, C.
name: Thompson, I. B.
name: Aparicio, A.
name: Bertelli, G.
name: Hodge, P. W.
name: Lee, M. G.
name: Olszewski, E. W.
name: Saha, A.
name: Stetson, P. B.
name: Suntzeff, N. B.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present deep HST F555W (V) and F814W (I) observations of a central field in the Local Group dwarf spheroidal (dSph) galaxy Leo I. The resulting color-magnitude diagram (CMD) reaches I \simeq 26 and reveals the oldest ~10-15 Gyr old turnoffs. Nevertheless, a horizontal branch is not obvious in the CMD. Given the low metallicity of the galaxy, this likely indicates that the first substantial star formation in the galaxy may have been somehow delayed in Leo I in comparison with the other dSph satellites of the Milky Way. The subgiant region is well and uniformly populated from the oldest turnoffs up to the 1 Gyr old turnoff, indicating that star formation has proceeded in a continuous way, with possible variations in intensity but no big gaps between successive bursts, over the galaxy's lifetime. The structure of the red-clump of core He-burning stars is consistent with the large amount of intermediate-age population inferred from the main sequence and the subgiant region. In spite of the lack of gas in Leo I, the CMD clearly shows star formation continuing until 1 Gyr ago and possibly until a few hundred Myrs ago in the central part of the galaxy.
description: 26 pages with 8 figures (fig 2 not available electronically). To be published in ApJ, April 1 1999 (vol.514, #2)
Phasianus pictus Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Galliformes
Phasianidae
Phasianus
Phasianus pictus

description: Phasianus pictus [spec. nov.]
P. crista flava, pectore coccineo, remigibus secundariis caeruleis. Amoen. acad. 1. p. 282. t. 13.
Phasianus variis coloribus splendidus. Edw. av. 68. t. 68. & t. 69. f. 2.
Phasianus ruber, e china. Alb. av. 3. p. 34. t. 30.
Habitat in China.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 158, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Direct Signature of Evolving Gravitational Potential from Cosmic Microwave Background
Creators: name: Seljak, Uros
name: Zaldarriaga, Matias
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that time dependent gravitational potential can be directly detected from the cosmic microwave background (CMB) anisotropies. The signature can be measured by cross-correlating the CMB with the projected density field reconstructed from the weak lensing distortions of the CMB itself. The cross-correlation gives a signal whenever there is a time dependent gravitational potential. This method traces dark matter directly and has a well defined redshift distribution of the window projecting over the density perturbations, thereby avoiding the problems plaguing other proposed cross-correlations. We show that both MAP and Planck will be able to probe this effect for observationally relevant curvature and cosmological constant models, which will provide additional constraints on the cosmological parameters.
description: 4 pages, 2 figures. Submitted to PRL
Stellar populations in gas-rich galaxy mergers II. Feedback effects of Type Ia and II supernovae
Creators: name: Bekki, Kenji
name: Shioya, Yasuhiro
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We numerically investigate chemodynamical evolution of major disk-disk galaxy mergers in order to explore the origin of mass-dependent chemical, photometric, and spectroscopic properties observed in elliptical galaxies. We particularly investigate the dependence of the fundamental properties on merger progenitor disk mass (M_d). Main results obtained in this study are the following three. (1) More massive (luminous) ellipticals formed by galaxy mergers between more massive spirals have larger metallicity (Z) and thus show redder colors: The typical metallicity ranges from ~ 1.0 solar abundance (Z~ 0.02) for ellipticals formed by mergers with M_d = 10^10 M_solar to ~ 2.0 solar (Z ~ 0.04) for those with M_d = 10^12 M_solar. (2) The absolute magnitude of negative metallicity gradients developed in galaxy mergers is more likely to be larger for massive ellipticals. Absolute magnitude of metallicity gradient correlates with that of age gradient in ellipticals in the sense that an elliptical with steeper negative metallicity gradient is more likely to show steeper age gradient. (3) Both M/L_B and M/L_K, where M, L_B, and L_K are total stellar mass of galaxy mergers, B-band luminosity, and K-band one, respectively, depend on galactic mass in such a way that more massive ellipticals have larger M/L_B and smaller M/L_K.
description: 58 pages 16 figures, ApJ in press (March 1999 issue)
A Conformal Collider for Holographic CFTs
Creators: name: Afkhami-Jeddi, Nima
name: Kundu, Sandipan
name: Tajdini, Amirhossein
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We develop a formalism to study the implications of causality on OPE coefficients in conformal field theories with large central charge and a sparse spectrum of higher spin operators. The formalism has the interpretation of a new conformal collider-type experiment for these class of CFTs and hence it has the advantage of requiring knowledge only about CFT three-point functions. This is accomplished by considering the holographic null energy operator which was introduced in arXiv:1709.03597 as a generalization of the averaged null energy operator. Analyticity properties of correlators in the Regge limit imply that the holographic null energy operator is a positive operator in a subspace of the total CFT Hilbert space. Utilizing this positivity condition, we derive bounds on three-point functions $\langle TO_1O_2\rangle$ of the stress tensor with various operators for CFTs with large central charge and a sparse spectrum. After imposing these constraints, we also find that the operator product expansions of all primary operators in the Regge limit have certain universal properties. All of these results are consistent with the expectation that CFTs in this class, irrespective of their microscopic details, admit universal gravity-like holographic dual descriptions. Furthermore, this connection enables us to constrain various inflationary observables such as the amplitude of chiral gravity waves, non-gaussanity of gravity waves and tensor-to-scalar ratio.
description: 52+15 pages, 5 figures
title: ADCO, Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Cart. 32 (G 136), 745 folios, f. 1360
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: cartulaire

description: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 1360, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 1360, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
Wave equations on graded groups and hypoelliptic Gevrey spaces
Creators: name: Taranto, Chiara Alba
Publisher: name: Imperial College London
Year: 2017

description: The overall goal of this dissertation is to investigate certain classical results from harmonic analysis, replacing the Euclidean setting, the abelian structure and the elliptic Laplace operator with a non-commutative environment and hypoelliptic operators. More specifically, we consider wave equations for hypoelliptic homogeneous left-invariant operators on graded Lie groups with time-dependent non-negative propagation speeds that are H\"older-regular or even more so. The corresponding Euclidean problem has been extensively studied in the `80s and some additional results have been recently obtained by Garetto and Ruzhansky in the case of a compact Lie group. We establish sharp well-posedness results in the spirit of the classical result by Colombini, De Giorgi and Spagnolo. In this investigation, a structure reminiscent of Gevrey regularity appears, inspiring deeper investigation of certain classes of functions and a comparison with Gevrey classes. In the latter part of this thesis we discuss such Gevrey spaces associated to the sums of squares of vector fields satisfying the H\"ormander condition on manifolds. This provides a deeper understanding of the Gevrey hypoellipticity of sub-Laplacians. It is known that if $\mathcal L$ is a Laplacian on a closed manifold $M$ then the standard Gevrey space $\gamma^s$ on $M$ defined in local coordinates can be characterised by the condition that $\|e^{D\slp^{\frac{1}{2s}}}\phi\|_{L^2(M)}0$. The aim in this part is to discuss the conjecture that a similar characterisation holds true if $\mathcal L$ is H\"ormander's sum of squares of vector fields, with a sub-Laplacian version of the Gevrey spaces involving these vector fields only. We prove this conjecture in one direction, while in the other we show it holds for sub-Laplacians on $SU(2)$ and on the Heisenberg group $\mathbb{H}_n$.
Dust in an extremely metal-poor galaxy: mid-infrared observations of SBS 0335-052
Creators: name: Thuan, T. X.
name: Sauvage, M.
name: Madden, S.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The metal deficient (Z = Z_sun/41) Blue Compact Dwarf Galaxy (BCD) SBS 0335-052 was observed with ISOCAM between 5 and 17 mic. With a L_12mic/L_B ratio of 2.15, the galaxy is unexpectedly bright in the mid-infrared for such a low-metallicity object. The mid-infrared spectrum shows no sign of the Unidentified Infrared Bands, which we interpret as an effect of the destruction of their carriers by the very high UV energy density in SBS 0335-052. The spectral energy distribution (SED) is dominated by a very strong continuum which makes the ionic lines of [SIV] and [NeIII] very weak. From 5 to 17 mic, the SED can be fitted with a grey-body spectrum, modified by an extinction law similar to that observed toward the Galactic Center, with an optical depth of A_V~19-21 mag. Such a large optical depth implies that a large fraction (as much as ~ 75%) of the current star-formation activity in SBS 0335-052 is hidden by dust with a mass between 3x10^3 M_sun and 5x10^5 M_sun. Silicate grains are present as silicate extinction bands at 9.7 and 18 mic can account for the unusual shape of the MIR spectrum of SBS 0335-052. It is remarkable that such a nearly primordial environment contains as much dust as galaxies which are 10 times more metal-rich. If the hidden star formation in SBS 0335-052 is typical of young galaxies at high redshifts, then the cosmic star formation rate derived from UV/optical fluxes would be underestimated.
description: 13 pages, 4 figures, requires aaspp4.sty, accepted in ApJ
title: Transcription du manuscrit de Semur-en-Auxois, Bibliothèque Municipale, ms. 1, p. 40
Creators: name: Aubert, Eduardo Henrik
name: Brochard, Pierre
name: Aubert, Eduardo Henrik
name: Brochard, Pierre
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2022
Subjects: subject: Laboratoire de médiévistique occidentale de Paris
subject: Semur-en-Auxois
subject: LaMOP

description: Transcription du manuscrit de Semur-en-Auxois, Bibliothèque Municipale, ms. 1, p. 40

production-software: eScriptorium + Kraken version 3.0.13 (PageXml)
description: Source: https://www.nakala.fr/10.34847/nkl.cf37zd8z
description: Source: https://www.nakala.fr/10.34847/nkl.e905tdea
description: Relation: https://lamop.hypotheses.org/
description: Transcription du manuscrit Semur-en-Auxois, Bibliothèque Municipale, ms. 1
description: Transcription du manuscrit Semur-en-Auxois, Bibliothèque Municipale, ms. 1
On the Survival and Destruction of Spiral Galaxies in Clusters
Creators: name: Moore, Ben
name: Lake, George
name: Quinn, Thomas
name: Stadel, Joachim
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We follow the evolution of disk galaxies within a cluster that forms hierarchically in a cold dark matter N-body simulation. At a redshift z=0.5 we select several dark matter halos that have quiet merger histories and are about to enter the newly forming cluster environment. The halos are replaced with equilibrium high resolution model spirals that are constructed to represent examples of low surface brightness (LSB) and high surface brightness (HSB) galaxies. Varying the disk and halo structural parameters reveals that the response of a spiral galaxy to tidal encounters depends primarily on the potential depth of the mass distribution and the disk scale length. LSB galaxies, characterised by slowly rising rotation curves and large scale lengths, evolve dramatically under the influence of rapid encounters with substructure and strong tidal shocks from the global cluster potential --- galaxy harassment. We find that up to 90% of their stars are tidally stripped and congregate in large diffuse tails that trace the orbital path of the galaxy and form the diffuse intra-cluster light. The bound stellar remnants closely resemble the dwarf spheroidals (dE's) that populate nearby clusters. HSB galaxies are stable to the chaos of cluster formation and tidal encounters. These disks lie well within the tidally limited dark matter halos and their potentials are more concentrated. Although very few stars are stripped, the scale height of the disks increases substantially and no spiral features remain, therefore we speculate that these galaxies would be identified as S0 galaxies in present day clusters.
description: MNRAS in press. Low resolution images included; entire paper at high resolution available at http://star-www.dur.ac.uk:80/~moore/lsb.ps.gz
Additional file 1: of Cryptic sequence features in the active postmortem transcriptome
Creators: name: Noble, Peter
name: Pozhitkov, Alexander
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Developmental Biology

description: Proof that using the ‘Chaos Genome Representation’ method to extract mers from transcript sequences is more practical (computational efficient) than string-based search algorithms. (DOCX 20 kb)
Gigahertz Peaked Spectrum sources from the Jodrell Bank-VLA Astrometric Survey
Creators: name: Marecki, A.
name: Falcke, H.
name: Niezgoda, J.
name: Garrington, S. T.
name: Patnaik, A. R.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations with MERLIN at 408 MHz have been used to establish the low-frequency part of the spectra of more than a hundred compact radio sources taken from the part of the Jodrell Bank--VLA Astrometric Survey limited by 35 deg. < δ< 75 deg. These sources were selected from JVAS and other catalogues to have convex spectra between 1.4 and 8.4 GHz, characteristic of Gigahertz Peaked Spectrum (GPS) sources. We have confirmed convex shapes of the spectra of 76 objects (one half of our initial candidates) thereby yielding the largest genuine sample of GPS sources compiled so far. Seven of 17 identified quasars in the sample have large ($z\ga 2$) redshifts.
description: 18 pages, 2 figures, minor corrections. To appear in: A&A Suppl. vol. 135 (March 1999)
Excited States and Optical Properties of Hydrogen-Passivated Rectangular Graphenes: A Computational Study
Creators: name: Rai, Deepak Kumar
name: Shukla, Alok
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In this paper, we perform large-scale electron-correlated calculations of optoelectronic properties of rectangular graphene-like polycyclic aromatic hydrocarbon molecules. Theoretical methodology employed in this work is based upon Pariser-Parr-Pople (PPP) $π$-electron model Hamiltonian, which includes long-range electron-electron interactions. Electron-correlation effects were incorporated using multi-reference singles-doubles configuration-interaction (MRSDCI) method, and the ground and excited state wave functions thus obtained were employed to calculate the linear optical absorption spectra of these molecules, within the electric-dipole approximation. As far as the ground state wave functions of these molecules are concerned, we find that with the increasing size, they develop a strong diradical open-shell character. Our results on optical absorption spectra are in very good agreement with the available experimental results, outlining the importance of electron-correlation effects in accurate description of the excited states. In addition to the optical gap, spin gap of each molecule was also computed using the same methodology. Calculated spin gaps exhibit a decreasing trend with the increasing sizes of the molecules, suggesting that the infinite graphene has a vanishing spin gap.
description: main text 17 pages + 5 figures, supporting information 23 pages, to appear in Scientific Reports
Proteomic and phosphoproteomic analysis of the effect of exendin-4 treatment on the rat pancreatic beta cell line ins-1
Creators: name: Al Mismar, Rasha
Publisher: name: Imperial College London
Year: 2017

description: Diabetes is a major worldwide health problem, and the incidence is increasing. Although the etiology of types 1 and 2 diabetes is different, the developmental complications of both types involve destruction of pancreatic beta cells. Enhancing or inducing pancreatic beta cell proliferation is thus a focus of much research. Exendin-4, a GLP-1 analogue, was introduced into the clinic in 2005 as an inducer of insulin secretion, but also has proliferative effects on pancreatic beta cells in vitro. These effects have been characterized in targeted studies, identifying specific proteins in particular signaling pathways. In our study, we aimed to carry out global proteomic and phosphoproteomic relative quantitation screening to identify the proteins and their phosphorylation sites regulated by exendin-4 treatment in rat ins-1 cells, compared to their untreated counterparts. We were able to quantify 3766 proteins among which 667 proteins were significantly regulated. In addition, we quantified 2170 phosphosites, 400 of which were significantly regulated. The significantly regulated proteins and phosphosites after exendin-4 treatment pointed to a protective role for this peptide in maintaining cell survival and inhibiting apoptosis due to the stress induced by the serum starvation, which is in agreement of previous reports. This thesis thus provides the first global proteomic analysis of the effects of exendin-4 on the rat pancreatic beta cells. Further studies employing different culture conditions and knockdown or overexpression of candidate proteins are now required to give deeper insight into the pathways involved.
Phasianus nycthemerus Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Galliformes
Phasianidae
Phasianus
Phasianus nycthemerus

description: Phasianus nycthemerus [spec. nov.]
P. albus, crista abdomineque nigris.
Phasianus sinensis albus e nigro caeruleus. Alb. av. 3. p. 35. t. 37. Edw. av. 66. t. 66.
Habitat in China.
Tempora nuda rubra. Maris crista nigra. Femina grisea est.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 159, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Motivic Euler characteristics and Witt-valued characteristic classes
Creators: name: Levine, Marc
Publisher: name: arXiv
Year: 2018
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 14F42, 55N20, 55N35

description: This paper examines a number of related questions about Euler characteristics and characteristic classes with values in Witt cohomology. We establish a motivic version of the Becker-Gottllieb transfer, generalizing a construction of Hoyois. Ananyevskiy's splitting principle reduces questions about characteristic classes of vector bundles in $\text{SL}$-oriented, $η$-invertible theories to the case of rank two bundles. We refine the torus-normalizer splitting principle for $\text{SL}_2$ to help compute the characteristic classes in Witt cohomology of symmetric powers of a rank two bundle, and then generalize this to develop a general calculus of characteristic classes with values in Witt cohomology.
description: This is a final version, the paper is published online by the Nagoya Math. Journal
Phase 1b study of tirabrutinib in combination with idelalisib or entospletinib in previously treated B-cell lymphoma
Creators: name: Morschhauser, Franck
name: Dyer, Martin J. S.
name: Walter, Harriet S.
name: Danilov, Alexey V.
name: Ysebaert, Loic
name: Hodson, Daniel James
name: Fegan, Christopher
name: Rule, Simon A.
name: Radford, John
name: Cartron, Guillaume
name: Bouabdallah, Krimo
name: Davies, Andrew John
name: Spurgeon, Stephen
name: Rajakumaraswamy, Nishanthan
name: Li, Biao
name: Humeniuk, Rita
name: Huang, Xi
name: Bhargava, Pankaj
name: Jürgensmeier, Juliane M.
name: Salles, Gilles
Publisher: name: Apollo - University of Cambridge Repository
Year: 2020
Subjects: Letter
/692/308/153
/692/699/67/1059
letter

description: Funder: Gilead Sciences (Gilead); doi: https://doi.org/10.13039/100005564