cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pyrolysis Reactions Of Some Hydrocarbons Relevant To Substitute Natural Gas Making Processes
Creators: name: Rhodes, Geoffrey
Publisher: name: London South Bank University
Year: 1985

description: The pyrolytic and carbon forming reactions of a number of petroleum based feedstocks have been studied. These fractions ranged from light distillates with a final boiling point (FBP) of 120°C to an atmospheric residual oil with an FBP of ~450°. The lighter feedstocks (naphtha to gas oil) were pyrolysed at 400 to 620°C and 40 bar alone and in atmospheres of steam and hydrogen. The heavier feedstocks were pyrolysed at 40 bar in an atmosphere of hydrogen at temperatures up to 800°C. Products were analysed by GC, MS, NMR and elemental analysis. At temperatures up to 600°C steam acts as an inert diluent and conditions likely to cause carbon formation can be detected by an increase in absorbance of the liquid product at about 220nm. Below 600°C only the alkane fraction of the feedstock reacts, mostly yielding gases, but some aromatisation takes place. These aromatic species appear to the carbon precursors. An activation energy (E.) of 210 -15kJ mol was obtained for long chain n-alkanes. Experiments on heavy residual oil confirmed that aromatic species were involved in carbon formation at temperatures below 650sC -2 A large proportion of the carbon formed by these oils came from asphaltenes. These asphaltenes lost their side chains as gas while the aromatic nuclei aggregated to yield carbon. Unsubstituted aromatics did not give carbon under these conditions, but partially reduced aromatics did. Carbon formation appears to be initiated by "activated" aromatic species formed by the loss of alkyl side chains from aromatic molecules. It was possible to predict the product compositions from the hydro pyrolysis of both an aromatic and a partially hydrogenated feedstock using a simple kinetic model.
title: 2021 New Zealand Ground-Motion Database
Creators: name: Hutchinson, Jesse
name: Bradley, Brendon A.
name: Lee, Robin
name: Wotherspoon, Liam
name: Dupuis, Mike
name: Schill, Claudio
name: Motha, Jason
name: Kaiser, Anna E.
name: Manea, Elena F.
Publisher: name: GNS Science
Year: 2022

description: This report summarises the development of the 2021 New Zealand ground-motion database. Ground-motion intensity measures have been computed from strong-motion recordings for events with moment (and moment-equivalent) magnitudes equal to or greater than 4.0 from the year 2000 until the end of 2020. These measures include peak ground acceleration, peak ground velocity, cumulative absolute velocity, Arias intensity and pseudo-acceleration response spectra, among others. Along with these intensity measures, we have determined and/or collated earthquake rupture properties, re-computed earthquake magnitudes, event tectonic classifications, propagation path and near-surface site effects information. This information is compiled in several relational tables that comprise the entirety of the database, including a ‘flat file’ format with all intensity measures, along with key metadata such as source-to-site distances, hypocentral locations, magnitudes, site classification information and tectonic classifications. (The authors)
How do occupants perceive thermal comfort in a hybrid office space? A case study of a co-working space in London
Creators: name: Pan, Jiayu
name: Bardhan, Ronita
name: Chen, Shushen
Publisher: name: Apollo - University of Cambridge Repository
Year: 2024
Subjects: Hybrid working
Office space
Thermal comfort

description: The work pattern has been reshaped towards a hybrid style since the lockdown in the pandemic, while the office design needs to be evolved with the change in working mode. It is important to understand how to design the workspace to meet the new demand. This study investigates the environmental performance of a flexible co-working space in London by a longitudinal field study, with a specific focus on thermal comfort and lighting sensations and preferences. The field study is composed of a questionnaire survey about occupants’ thermal comfort sensations and environmental preferences and a concurrent measurement of indoor environmental data (temperature, relative humidity, air velocity and illumination level). This paper presents a preliminary analysis of the data collected in spring 2022. A total of 79 responses are recorded over three months. The findings in this study are expected to provide new insight into environmental design solutions for the hybrid and flexible work setting.
Social capital and farmers’ leadership in Iranian rural communities: application of social network analysis
Creators: name: Moghfeli, Zohreh
name: Ghorbani, Mehdi
name: Rezvani, Mohammad Reza
name: Khorasani, Mohammad Amin
name: Azadi, Hossein
name: Scheffran, Jürgen
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Science Policy

description: This study aimed to analyze the role of social capital and leadership in improving the adaptive capacity of Iranian pistachio farmers by using Social Network Analysis (SNA). The results indicate that the studied network is not a dense network, and there are few reciprocal and face-to-face relations among farmers. The findings also illustrate that in all cooperative links, there were no noticeable bridging links among the farmers and their tendency toward bonding links, indicating less bridging social capital at the three studied villages. The nature of relationships in social networks will improve if the quality of communication between individuals in a network and actors from other networks and villages is enhanced. This can increase the productivity of social networks and lead to higher quality resources, better support, development of useful information between networks and improvement in farmers’ adaptive capacity.
Jet-Images: Computer Vision Inspired Techniques for Jet Tagging
Creators: name: Cogan, Josh
name: Kagan, Michael
name: Strauss, Emanuel
name: Schwartzman, Ariel
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We introduce a novel approach to jet tagging and classification through the use of techniques inspired by computer vision. Drawing parallels to the problem of facial recognition in images, we define a jet-image using calorimeter towers as the elements of the image and establish jet-image preprocessing methods. For the jet-image processing step, we develop a discriminant for classifying the jet-images derived using Fisher discriminant analysis. The effectiveness of the technique is shown within the context of identifying boosted hadronic W boson decays with respect to a background of quark- and gluon- initiated jets. Using Monte Carlo simulation, we demonstrate that the performance of this technique introduces additional discriminating power over other substructure approaches, and gives significant insight into the internal structure of jets.
Siegfried Gutenbrunner, Herbert Jankuhn, Wolfgang Laur, Völker und Stämme Südostschleswigs im frühen Mittelalter.
Creators: name: Tischler, Fritz
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Siegfried Gutenbrunner, Herbert Jankuhn, Wolfgang Laur, Völker und Stämme Südostschleswigs im frühen Mittelalter. Gottorfer Schriften zur Landeskunde Schleswig-Holsteins Bd. 1. Schleswig (Verlag Arbeitsgemeinschaft fur Landes- und Altertumsforschung) 1952. 183 Seiten, 23 Abbildungen, 3 Tafeln.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Evidence for a Finite Temperature Insulator
Creators: name: Ovadia, M.
name: Kalok, D.
name: Tamir, I.
name: Mitra, S.
name: Sacepe, B.
name: Shahar, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In superconductors the zero-resistance current-flow is protected from dissipation at finite temperatures (T) by virtue of the short-circuit condition maintained by the electrons that remain in the condensed state. The recently suggested finite-T insulator and the "superinsulating" phase are different because any residual mechanism of conduction will eventually become dominant as the finite-T insulator sets-in. If the residual conduction is small it may be possible to observe the transition to these intriguing states. We show that the conductivity of the high magnetic-field insulator terminating superconductivity in amorphous indium-oxide exhibits an abrupt drop, and seem to approach a zero conductance at T<0.04 K. We discuss our results in the light of theories that lead to a finite-T insulator.
Günther Haseloff, Der Tassilokelch.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Günther Haseloff, Der Tassilokelch. Münchner Beiträge zur Vor- und Frühgeschichte, hrsg. von J. Werner, Bd. 1. München (C. H. Beck’sche Verlagsbuchhandlung) 1951. 88 Seiten mit 39 Abbildungen im Text und 16 Tafeln.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Strong correlations and topology in novel condensed matter platforms
Creators: name: Kumar, Ajesh
name: 0000-0002-6280-1845
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Strongly correlated phenomena
Moiré
Floquet topology
Superconducting qubits

description: This dissertation presents a study of various phenomena in quantum condensed matter physics by focusing on their realization in promising novel highly-tunable experimental platforms. Chapters 2 − 4 focus on the design and theoretical study of different moiré material platforms that can simulate strongly correlated phenomena that have proved difficult to understand for many years. Chapter 2 proposes a transition metal dichalcogenide trilayer moiré heterostructure that can realize heavy-fermion quantum criticality, and is based on Ref. [113]. Chapter 3 describes low-energy collective modes of the correlated insulators in magic-angle twisted bilayer graphene and gives a simple physical interpretation of them. This is based on Ref. [115]. Chapter 4 proposes twisted bilayer graphene in a perpendicular magnetic field as a quantum simulator of non-Fermi liquid behavior, and is based on Ref. [111]. Chapter 5 focuses on realizing a Floquet symmetry protected topological phase in a superconducting qubit arrays and trapped ion quantum processors. It discusses ways to detect the topological phase, which are typically hidden to simple local probes, and is based on Ref. [112]. Chapter 6 (based on Ref. [114]) studies phase transitions involving quasiparticles whose motion is intrinsically constrained. Two-dimensional crystals provide a concrete realization of this problem and our results provide strong constraints on how these crystals can quantum melt. Finally, Chapter 7 discusses some open questions related to the material presented in this thesis.
Simultaneous torsion in the Legendre family
Creators: name: Stoll, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We improve a result due to Masser and Zannier, who showed that the set $$ \{λ\in {\mathbb C} \setminus \{0,1\} : (2,\sqrt{2(2-λ)}), (3,\sqrt{6(3-λ)}) \in (E_λ)_{\text{tors}}\} $$ is finite, where $E_λ\colon y^2 = x(x-1)(x-λ)$ is the Legendre family of elliptic curves. More generally, denote by $T(α, β)$, for $α, β\in {\mathbb C} \setminus \{0,1\}$, $α\neq β$, the set of $λ\in {\mathbb C} \setminus \{0,1\}$ such that all points with $x$-coordinate $α$ or $β$ are torsion on $E_λ$. By further results of Masser and Zannier, all these sets are finite. We present a fairly elementary argument showing that the set $T(2,3)$ in question is actually empty. More generally, we obtain an explicit description of the set of parameters $λ$ such that the points with $x$-coordinate $α$ and $β$ are simultaneously torsion, in the case that $α$ and $β$ are algebraic numbers that not 2-adically close. We also improve another result due to Masser and Zannier dealing with the case that ${\mathbb Q}(α, β)$ has transcendence degree 1. In this case we show that $\#T(α, β) \le 1$ and that we can decide whether the set is empty or not, if we know the irreducible polynomial relating $α$ and $β$. This leads to a more precise description of $T(α, β)$ also in the case when both $α$ and $β$ are algebraic. We performed extensive computations that support several conjectures, for example that there should be only finitely many pairs $(α, β)$ such that $\#T(α, β) \ge 3$.
description: 24 pages. v2: Improved 2-adic results, leading to more cases that can be treated explicitly. Used this to solve a problem considered in arXiv:1509.06573. Added some references
BOʻLAJAK PSIXOLOGLARNING LINGVOKOGNITIV KOMPETENSIYASINI RIVOJLANTIRISH MEXANIZMLARI
Creators: name: Allamuratov, Gʻofur
Publisher: name: Zenodo
Year: 2024

description: Bu maqolada bo‘lajak psixologlarning lingvokognitiv kompetensiyasini rivolantirish haqida so‘z boradi. Shuningdek bu maqsadga erishishda foydalanish mumkin bo‘lgan usullar haqida ham to‘xtalib o‘tiladi. Bo‘lg‘usi psixologlarga amaliy ishlarida maslahatlar ham berilgan.
Taunting the Tyrant of Antiquity: Isaiah 14:4-23
Creators: name: Williams, Jonathan
Publisher: name: Zenodo
Year: 2020
Subjects: Isaiah 14
Sargon II
Babylon
Assyria
Satan
Lucifer
Taunt-genre
Hubris
Phaethon
Helios

description: Isaiah 14:12-15 has for centuries been traditionally taught as a description of the pre-human downfall of Satan/Lucifer. This viewpoint is being largely abandoned in favor of it being a description of the hubris of a pagan king who wants to transcend the boundaries between humanity and God. This paper sets 14:12-15 in its larger context of Isaiah's taunt against such a tyrannical ruler which his people faced and which the people of God must face as new tyrants arise in our world.
The hard life of swarming bacteria on soft substrates
Creators: name: Gudavadze, Irakli
name: 0000-0002-6624-0918
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Bacterial swarming
Capillary forces
Surface tension

description: Bacterial swarming is a rapid, collective movement of cells over a water-permeable surface, powered by rotating flagella. Spreading on a surface poses challenges not encountered during swimming in three-dimensional liquid. To cope with these challenges, bacteria undergo various morphological and physiological changes, including producing more flagella, cell elongation, and secreting surfactants. While hydration is essential for flagella-driven locomotion, it is poorly understood how bacteria draw and retain the necessary liquid around them, and how thick this liquid layer is. Here we use confocal laser scanning microscopy to experimentally determine the thickness of the liquid layer where bacteria swarm in a monolayer with the precision of a few tens of nm. In contrast to the current presumption in the field, we found this thickness to be smaller than a bacterium diameter, resulting in capillary forces on them. We developed a computer simulation to calculate these surface tension forces and found them to be on the order of a few nanonewtons, strongly confining bacteria to the surface. As a result, bacteria experience orders of magnitude greater resistive force during swarming than during swimming. We discuss how aforementioned morphological and physiological changes help swarming bacteria overcome con fining surface tension forces. These results pave the way for understanding how swarming bacteria spread on surfaces.
Édouard Salin, La civilisation mérovingienne d’apres les sépul­tures, les textes et le laboratoire.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Édouard Salin, La civilisation mérovingienne d’apres les sépul­tures, les textes et le laboratoire. I: Les idées et les faits. Paris (A. et J. Picard et Cie.) 1950. 531 Seiten mit 150 Abbildungen.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
P. C. J. A. Boeles, Friesland tot de elfde eeuw.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: P. C. J. A. Boeles, Friesland tot de elfde eeuw. Zijn voor- en vroege geschiedenis. 2. Auflage. ’S-Gravenhage (Martinus Nijhoff) 1951. 598 Seiten mit 90 Abbildungen, 55 Tafeln und 2 Karten.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
JASÍL QAPLAMA PAYDA ETIWDE SEKSEWIL ÓSIMLIGINIŃ ÁHMIYETI HÁM KÓBEYTIW USÍLLARÍ
Creators: name: Baltaniyazov, Jaqsıbay
name: Madraimov, Rustamjon
Publisher: name: Zenodo
Year: 2023

description: Málim bir aymaqtı kóklemzarlastırǵanda yaki qolaysız faktorlardan qorǵaw maqsetinde jasıl qaplamalar payda etiwde sol jerdiń tábiyiy sharayatın úyrenip hámde sol jerde óse alatuǵın ósimlik túrlerin tańlap alıwımız tiyis. Qumlı sharayatlarda óse alatuǵın ósimlik túrleri sheklengen. Bunday sharayatlarda dominant túrler seksewil hám jınǵıl ósimligi bolıp esaplanadı. Solardı inabatqa alǵan halda bul maqalada jasıl qaplama payda etiwde seksewil ósimliginiń áhmiyeti hám kóbeytiw usíllarí haqqında qısqasha maǵlıwmat keltirilgan.
Ella Kivikoski, Die Eisenzeit Finnlands.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Ella Kivikoski, Die Eisenzeit Finnlands. Bilderatlas und Text I. Porvoo-Helsinki (Werner Söderström) 1947. 60 Seiten und 74 Tafeln. — Bilderatlas und Text II. Porvoo - Helsinki (Werner Söderström) 1951. 46 Seiten und 86 Tafeln.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Effects of Survey Design on the Response Rate in Crime Surveys
Creators: name: Klingwort, Jonas
name: Jeldrik Bakker
name: Toepoel, Vera
Publisher: name: Zenodo
Year: 2022

description: The number of population surveys conducted is enormous and increasing, but response rates are declining across all data collection modes. With increasing nonresponse, the risk of a nonresponse bias increases resulting in biased survey estimates. The solution to avoid the missing data problem is not to have any. A well-designed survey and professional administration are required to approach this solution.

 This work aims to quantify the effects of survey design features on the response rate in surveys. This is demonstrated using German crime surveys. Individual and independent studies dominate criminological survey research in Germany. This circumstance allows systematically studying the effects of different survey design features and their impact on the response rate in crime surveys.

 A systematic literature review of German crime surveys between 2001-2021 was conducted, and 138 surveys were identified. Of those, 84 qualified to be eligible for analysis. Furthermore, survey design features, such as study year (2001-2021), target population (general and non-general), coverage area (local, national, regional), data collection mode (CATI, CAWI, F2F, PAPI, Other), and others were collected. A meta-regression model was fitted to quantify the influence of the design features on the response rate.

 Such a model can be used for decision-making when (re-) designing a population survey and which design features to adjust if a high response rate is desired.
Isoclinism of crossed modules
Creators: name: Odabas, A.
name: Uslu, E. O.
name: Ilgaz, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We introduce the isoclinism of crossed modules. We also give GAP implementations for constructing the isoclinism families of finite crossed modules and consequently give an enumeration about isoclinic crossed modules existing in the GAP library.
description: 31 pages
Karl Brandt, Frühgeschichtliche Bodenforschungen im mittleren Ruhrgebiet.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Karl Brandt, Frühgeschichtliche Bodenforschungen im mittleren Ruhrgebiet. Paderborn (Ferdinand Schöningh) 1952. 230 Seiten mit 132 Abbildungen im Text.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Wolf Steidle, Sueton und die antike Biographie (Zetemata. Monographien zur klassischen Altertumswissenschaft, Heft 1).
Creators: name: Petrikovits, Harald Von
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Wolf Steidle, Sueton und die antike Biographie (Zetemata. Monographien zur klassischen Altertumswissenschaft, Heft 1). München (C. H. Beck) 1951. 188 Seiten.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Structure of magnetic domain wall in cylindrical microwire
Creators: name: Janutka, Andrzej
name: Gawronski, Przemyslaw
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The magnetization in the domain walls (DWs) formed inside the inner core of the amorphous ferromagnetic microwire is studied within a simple analytical model proposed. The influence of the ordering in the internal-stress created outer shell of the wire is included via an effective Dzyaloshinskii-Moriya-like anisotropy and resulting DW textures have been classified. The model is applicable to periodically constricted nanowires (whose core-shell magnetic structure follows from the magnetostatics) as well, which has enabled the verification of the predictions on DW structure with the micromagnetic simulations.
Materialhefte zur bayerischen Vorgeschichte.
Creators: name: Böhner, Kurt
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Materialhefte zur bayerischen Vorgeschichte. Für das bayerische Landesamt fur Denkmalpflege hrsg. von Werner Krämer. Heft 1: Hermann Müller-Karpe, Das Urnenfeld von Kelheim. Kallmünz/Opf. (Michael Lassleben) 1952. 51 Seiten und 31 Tafeln. Heft 2: Armin Stroh, Katalog Günzburg. Die vorgeschichtlichen Funde und Fundstätten. Kallmünz/Opf. (Michael Lassleben) 1952. 58 Seiten, 28 Tafeln und 2 Kartenbeilagen.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Scanning-gate-induced effects and spatial mapping of a cavity
Creators: name: Steinacher, R.
name: Kozikov, A. A.
name: Rössler, C.
name: Reichl, C.
name: Wegscheider, W.
name: Ihn, T.
name: Ensslin, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Tailored electrostatic potentials are the foundation of scanning gate microscopy. We present several aspects of the tip-induced potential on the two-dimensional electron gas. First, we give methods on how to estimate the size of the tip-induced potential. Then, a ballistic cavity is formed and studied as a function of the bias-voltage of the metallic top gates and probed with the tip-induced potential. It is shown how the potential of the cavity changes by tuning the system to a regime where conductance quantization in the constrictions formed by the tip and the top gates occurs. This conductance quantization leads to a unprecedented rich fringe pattern over the entire structure. Finally, the effect of electrostatic screening of the metallic top gates is discussed.
description: 10 pages, 6 figures
Saalburg Jahrbuch.
Creators: name: Petrikovits, Harald Von
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Saalburg Jahrbuch. Bericht des Saalburgmuseums 10, 1951. Berlin (Walter de Gruyter u. Co.) 1951. 80 Seiten mit 9 Abbildungen im Text, 5 Tafeln und 2 Beilagen (Plane).
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Studies presented to David Moore Robinson on his seventieth birthday, vol. I.
Creators: name: Möbius, Hans
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Studies presented to David Moore Robinson on his seventieth birthday, vol. I. Ed. by George E. Mylonas. Washington University, Saint Louis Missouri 1951. 876 Seiten und 112 Tafeln.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
{Multiband Superconductivity in Lu$_3$Os$_4$Ge$_{13}$
Creators: name: Prakash, Om
name: Thamizhavel, A.
name: Ramakrishnan, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Intermetallic R$_3$T$_4$X$_{13}$ series consists of cage like structure and have been in focus due to their unconventional electronic ground states. In this work, we report the normal and superconducting state properties of a high quality single crystal of Lu$_3$Os$_4$Ge$_{13}$. Lu$_3$Os$_4$Ge$_{13}$ belongs to the above mentioned series and crystallizes in a cubic crystal structure with the space group $\it{Pm\bar{3}n}$. Using electrical transport, magnetization and heat capacity measurements, we show that Lu$_3$Os$_4$Ge$_{13}$ is a type-II multi-band superconductor ($T{_c} =3.1$~K) with unusual superconducting properties. The analysis of the low temperature heat capacity data suggests that Lu$_3$Os$_4$Ge$_{13}$ is a moderately coupled multi-band BCS superconductor with two gaps ($2Δ/ {k{_B}T{_c}} = 3.68 \pm {0.04} ~\& ~0.34 \pm {0.02}$) in the superconducting state. The dc-magnetization ($M-H$) shows a large reversible region in the superconducting state similar to the vortex liquid phase observed in high-$T{_c}$ superconductors. The value of the Ginzburg number $G_{i}$ suggests that the thermal fluctuations, though small as compared to those in high-$T{_c}$ cuprates, may play an important role in the unpinning of the vortices in this compound. The electronic band structure calculations show that three bands cross the Fermi level and constitute a complex Fermi surface in Lu$_3$Os$_4$Ge$_{13}$
description: 12 pages, 6 figures
Complexity of modules over classical Lie superalgebras
Creators: name: Turkey, Houssein El
Publisher: name: arXiv
Year: 2014
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: The complexity of the simple and the Kac modules over the general linear Lie superalgebra $\mathfrak{gl}(m|n)$ of type $A$ was computed by Boe, Kujawa, and Nakano in 2012. A natural continuation to their work is computing the complexity of the same family of modules over the ortho-symplectic Lie superalgebra $\mathfrak{osp}(2|2n)$ of type $C$. The two Lie superalgebras are both of Type I which will result in similar computations. In fact, our geometric interpretation of the complexity agrees with theirs. We also compute a categorical invariant, z-complexity, introduced in Boe et al., and we interpret this invariant geometrically in terms of a specific detecting subsuperalgebra. In addition, we compute the complexity and the z-complexity of the simple modules over the Type II Lie superalgebras $\mathfrak{osp}(3|2)$, $D(2,1;α)$, $G(3)$, and $F(4)$.
description: arXiv admin note: text overlap with arXiv:1107.2579, arXiv:0905.2403 by other authors
Arthur Stein, Die Präfekten von Ägypten in der römischen Kaiserzeit.
Creators: name: Braunert, Horst
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Arthur Stein, Die Präfekten von Ägypten in der römischen Kaiserzeit. Dissertationes Bernenses historiam orbis antiqui nascentisque medii aevi elucubrantes edendas curavit A. Alföldi, Ser. I, Fasc. 1. Bern (A. Francke) 1950. 248 Seiten.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Viability of nonminimally coupled f (R) gravity
Creators: name: Bertolami, Orfeu
name: Páramos, Jorge
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we explore the viability of nonminimally coupled matter- curvature gravity theories, namely the conditions required for the absence of tachyon instabilities and ghost degrees of freedom. We contrast our finds with recent claims of a pathological behaviour of this class of models, which resorted to, in our view, an incorrect analogy with k-essence.
description: 13 pages. Accepted for publication in General Relativity and Gravitation
Karl Bertsch, Geschichte des deutschen Waldes.
Creators: name: Schmitz, Hermann
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: Karl Bertsch, Geschichte des deutschen Waldes, 3. Auflage. Jena (Gustav Fischer) 1951. 118 Seiten mit 95 Abbildungen im Text.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Existence of periodic orbits in nonlinear oscillators of Emden-Fowler form
Creators: name: Mancas, S. C.
name: Rosu, H. C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The nonlinear pseudo-oscillator recently tackled by Gadella and Lara is mapped to an Emden-Fowler (EF) equation that is written as an autonomous two-dimensional ODE system for which we provide the phase-space analysis and the parametric solution. Through an invariant transformation we find periodic solutions to a certain class of EF equations that pass an integrability condition. We show that this condition is necessary to have periodic solutions and via the ODE analysis we also find the sufficient condition for periodic orbits. EF equations that do not pass integrability conditions can be made integrable via an invariant transformation which also allows us to construct periodic solutions to them. Two other nonlinear equations, a zero-frequency Ermakov equation and a positive power Emden-Fowler equation are discussed in the same context
description: 13 pages, 5 figures, title changed and content extended, version accepted at Phys. Lett. A
The First Stars: formation under X-ray feedback
Creators: name: Hummel, Jacob A.
name: Stacy, Athena
name: Jeon, Myoungwon
name: Oliveri, Anthony
name: Bromm, Volker
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the impact of a cosmic X-ray background (CXB) on Population III stars forming in a minihalo at $z\simeq25$. Using the smoothed particle hydrodynamics code GADGET-2, we attain sufficient numerical resolution to follow gas collapsing into the centre of the minihalo from cosmological initial conditions up to densities of $10^{12}\,{\rm cm}^{-3}$, at which point we form sink particles. This allows us to study how the presence of a CXB affects the formation of H$_2$ and HD in the gas prior to becoming fully molecular. Using a suite of simulations for a range of possible CXB models, we follow each simulation for 5000\yr after the first sink particle forms. The CXB provides two competing effects, with X-rays both heating the gas and increasing the free electron fraction, allowing more H$_2$ to form. X-ray heating dominates below $n\sim1\,{\rm cm}^{-3}$, while the additional H$_2$ cooling becomes more important above $n\sim10^2\,{\rm cm}^{-3}$. The gas becomes optically thick to X-rays as it exits the quasi-hydrostatic `loitering phase,' such that the primary impact of the CXB is to cool the gas at intermediate densities, resulting in an earlier onset of baryonic collapse into the dark matter halo. At the highest densities, self-shielding results in similar thermodynamic behaviour across a wide range of CXB strengths. Consequently, we find that star formation is relatively insensitive to the presence of a CXB; both the number and the characteristic mass of the stars formed remains quite similar even as the strength of the CXB varies by several orders of magnitude.
description: Accepted for publication in MNRAS. Includes improved treatment of X-ray optical depth. 13 pages, 12 figures
F. Firbas, Spät- und nacheiszeitliche Waldgeschichte Mitteleuropas nördlich der Alpen.
Creators: name: Overbeck, Fritz
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Rezension zu: F. Firbas, Spät- und nacheiszeitliche Waldgeschichte Mitteleuropas nördlich der Alpen. Bd. II: Waldgeschichte der einzelnen Landschaften. Jena (Gustav Fischer) 1952. 8°, 266 Seiten mit 18 Abbildungen im Text.
description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Solar flare observations with Chandrayaan-2 Solar X-ray Monitor
Creators: name: Saiguhan, Bharath
Publisher: name: Zenodo
Year: 2023
Subjects: Astrophysics
Solar Physics

description: Solar flares ranging from small microflares to large X-class flares are believed to be the result of sudden release of magnetic energy in the atmosphere of the Sun. Measuring the distribution of various flare parameters over a wide range of flare intensities provide a good opportunity to investigate the scale invariance of the underlying physical processes. Solar X-ray Monitor (XSM) on board Chandrayaan-2 has been observing the Sun for more than three years, providing soft X-ray spectral measurements and has detected a many flares from sub-A class to X-class. XSM data provides a great opportunity for statistical studies of the solar flare parameters. For this purpose, we developed an automated flare-detection algorithm to identify the different flaring episodes from the XSM light curves that provide the start and end times of the flares in addition to the peak time. As the XSM observations often have gaps due to the Sun being out of its field of view, the algorithm is designed taking these gaps into consideration. The algorithm is applied on the XSM observations during its primary observing seasons to generate a flare database which is planned to be regularly updated and made available on the XSM website along with additional information of the flares from other sources. Here we present the details of the flare detection techniques and the results. We also discuss the preliminary flare parameter distributions and their future potential.
Optimized first-order methods for smooth convex minimization
Creators: name: Kim, Donghwan
name: Fessler, Jeffrey A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We introduce new optimized first-order methods for smooth unconstrained convex minimization. Drori and Teboulle recently described a numerical method for computing the $N$-iteration optimal step coefficients in a class of first-order algorithms that includes gradient methods, heavy-ball methods, and Nesterov's fast gradient methods. However, Drori and Teboulle's numerical method is computationally expensive for large $N$, and the corresponding numerically optimized first-order algorithm requires impractical memory and computation for large-scale optimization problems. In this paper, we propose optimized first-order algorithms that achieve a convergence bound that is two times smaller than for Nesterov's fast gradient methods; our bound is found analytically and refines the numerical bound. Furthermore, the proposed optimized first-order methods have efficient recursive forms that are remarkably similar to Nesterov's fast gradient methods.
Scaling laws for the bifurcation-escape rate in a nanomechanical resonator
Creators: name: Defoort, Martial
name: Puller, Vadim
name: Bourgeois, Olivier
name: Pistolesi, Fabio
name: Collin, Eddy
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on experimental and theoretical studies of the fluctuation-induced escape time from a metastable state of a nanomechanical Duffing resonator in cryogenic environment. By tuning in situ the non-linear coefficient $γ$ we could explore a wide range of the parameter space around the bifurcation point, where the metastable state becomes unstable. We measured in a relaxation process the distribution of the escape times. We have been able to verify its exponential distribution and extract the escape rate $Γ$. We investigated the scaling of $Γ$ with respect to the distance to the bifurcation point and $γ$, finding an unprecedented quantitative agreement with the theoretical description of the stochastic problem. Simple power scaling laws turn out to hold in a large region of the parameter's space, as anticipated by recent theoretical predictions. These unique findings, implemented in a model dynamical system, are relevant to all systems experiencing under-damped saddle-node bifurcation.
description: 5 pages, 4 figures
Grab der Äbtissin Theophanu von Essen.
Creators: name: Zimmermann, Walther
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Zu spätrömischen Elfenbeinen des Westreichs.
Creators: name: Delbrueck, Richard
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
MINTAQANING IJTIMOIY-SIYOSIY VA IQTISODIY MUNOSABATLARINI RIVOJLANTIRISH
Creators: name: Bekmurodova, Saodat
Publisher: name: Zenodo
Year: 2023

description: Ushbu maqolada mintaqani   innovatsion-iqtisodiy rivojlantirish strategiyasi haqida fikr mulohazalar keltirilgan bo'lib, mintaqa sanoat korxonalari har yili o'z ishlab chiqarish quvvatlarini rivojlantirish va modernizatsiya qilish, ishlab chiqarishni rivojlantirishning asosiy omillari sifatida axborot texnologiyalarini rivojlantirish va modernizatsiya qilishga sarmoya kiritmoqda.
Bleierne Inschrifttafeln aus mittelalterlichen Gräbern in den Rheinlanden.
Creators: name: Ehrentraut, Hartmut
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Globular cluster formation in the context of galaxy formation and evolution
Creators: name: Kruijssen, J. M. Diederik
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The formation of globular clusters (GCs) remains one of the main unsolved problems in star and galaxy formation. The past decades have seen important progress in constraining the physics of GC formation from a variety of directions. In this review, we discuss the latest constraints obtained from studies of present-day GC populations, the formation of young massive clusters (YMCs) in the local Universe, and the observed, large-scale conditions for star and cluster formation in high-redshift galaxies. The main conclusion is that the formation of massive, GC progenitor clusters is restricted to high-pressure environments similar to those observed at high redshift and at the sites of YMC formation in the local Universe. However, the correspondingly high gas densities also lead to efficient cluster disruption by impulsive tidal shocks, which limits the survival of GCs progenitor clusters. As a result, the long-term survival of GC progenitor clusters requires them to migrate into the host galaxy halo on a short time-scale. It is proposed that the necessary cluster migration is facilitated by the frequent galaxy mergers occurring at high redshift. We use the available observational and theoretical constraints to condense the current state of the field into a coherent picture of GC formation, in which regular star and cluster formation in high-redshift galaxies naturally leads to the GC populations observed today.
description: 34 pages, 7 figures, 1 table; invited review published in Classical and Quantum Gravity, 2014, Volume 31, issue 24, id. 244006, for a focus issue on Galactic Centres, Eds. Clifford Will and Pau Amaro-Seoane; minor changes with respect to the submitted version
Two-loop five-point amplitudes in massless QCD with finite fields
Creators: name: Moodie, Ryan
Publisher: name: Zenodo
Year: 2022

description: I will discuss the analytic calculation of two-loop five-point helicity amplitudes in massless QCD. In our workflow, we perform the bulk of the computation using finite field arithmetic, avoiding the precision-loss problems of floating-point representation. The integrals are provided by the pentagon functions. We use numerical reconstruction techniques to bypass intermediate complexity and obtain compact forms for the rational coefficients. I will present results for NLO full-colour gluon-initiated diphoton-plus-jet production and NNLO leading-colour trijet production.
Maximizing k-Submodular Functions and Beyond
Creators: name: Ward, Justin
name: Zivny, Stanislav
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: F.2.0

description: We consider the maximization problem in the value oracle model of functions defined on $k$-tuples of sets that are submodular in every orthant and $r$-wise monotone, where $k\geq 2$ and $1\leq r\leq k$. We give an analysis of a deterministic greedy algorithm that shows that any such function can be approximated to a factor of $1/(1+r)$. For $r=k$, we give an analysis of a randomised greedy algorithm that shows that any such function can be approximated to a factor of $1/(1+\sqrt{k/2})$. In the case of $k=r=2$, the considered functions correspond precisely to bisubmodular functions, in which case we obtain an approximation guarantee of $1/2$. We show that, as in the case of submodular functions, this result is the best possible in both the value query model, and under the assumption that $NP\neq RP$. Extending a result of Ando et al., we show that for any $k\geq 3$ submodularity in every orthant and pairwise monotonicity (i.e. $r=2$) precisely characterize $k$-submodular functions. Consequently, we obtain an approximation guarantee of $1/3$ (and thus independent of $k$) for the maximization problem of $k$-submodular functions.
description: Full version of a SODA'14 paper, to appear in ACM Transactions on Algorithms (TALG)
Ausgrabungen in der Colonia Traiana bei Xanten.
Creators: name: Von Petrikovits, Harald
name: Hopf, Maria
name: Schiemann, Elisabeth
name: Steeger, Albert
name: Zippelius, Adelhart
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
The Nuclear Cluster of the Milky Way: Total Mass and Luminosity (long version)
Creators: name: Fritz, Tobias K.
name: Chatzopoulos, Sotiris
name: Gerhard, Ortwin
name: Gillessen, Stefan
name: Genzel, Reinhard
name: Pfuhl, Oliver
name: Tacchella, Sandro
name: Eisenhauer, Frank
name: Ott, Thomas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Like many other late-type galaxies, the Milky Way contains a nuclear star cluster. In this work we obtain the basic properties of its dominant old stellar population. Firstly, we derive its structural properties by constructing a stellar surface density map of the central 1000" using extinction corrected star counts from VISTA, WFC3/IR and VLT/NACO data. We can describe the profile with a two-component model. The inner, slightly flattened (q=0.80+/-0.04) component is the nuclear cluster, while the outer component corresponds to the stellar component of the circumnuclear zone. We measure for the nuclear cluster a half-light radius of 178+/-51"~7+/-2 pc and a luminosity of M_Ks=-16.0+/-0.5. Secondly, we enlarge the range over which detailed dynamics are available from 1 pc to 4 pc. We obtain more than 10000 individual proper motions from NACO data, and more than 2500 radial velocities from VLT/SINFONI data. We determine the cluster mass by means of isotropic spherical Jeans modeling. We fix the distance to the Galactic Center and the mass of the supermassive black hole. We model the cluster either with a constant mass to light ratio or with a power law mass model. For the latter we obtain a slope of delta_M=1.18+/-0.06. Assuming spherical symmetry, we get a nuclear cluster mass within 100" of M_100"=6.09+/- 0.53_(fix_R_0) +/- 0.97_(R_0) * 10^6 M_sun for both modeling approaches. A model which includes the observed flattening gives a 47% larger mass, see Chatzopoulos et al. 2015. Our results slightly favor a core over a cusp in the mass profile. By minimizing the number of unbound stars within 8" in our sample we obtain a distance estimate of R$_0=8.53^{+0.21}_{-0.15}$ kpc, where an a priori relation between R_0 and SMBH mass from stellar orbits is used. Combining our mass and flux we obtain M/L=0.51+/-0.12 M_sun/L_(sun Ks). This is roughly consistent with a Chabrier IMF.
description: 47 pages, 32 figures (3 compressed), 9 tables, table 9 in full length available on request; ApJ accepted
Zur Matroneninschrift von Derichsweiler.
Creators: name: Gutenbrunner, Siegfried
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
$p$-vanishing conjugacy classes of symmetric groups
Creators: name: Morotti, Lucia
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: For a prime $p$, we say that a conjugacy class of a finite group $G$ is $p$-vanishing if every irreducible character of $G$ of degree divisible by $p$ takes value 0 on that conjugacy class. In this paper we completely classify 2-vanishing and 3-vanishing conjugacy classes for the symmetric group and do some work in the classification of $p$-vanishing conjugacy classes of the symmetric group for $p\geq 5$. This answers a question by Navarro for $p=2$ and $p=3$ and partly answers it for $p\geq 5$.
Über die Himmelserscheinung nach dem Tode Caesars.
Creators: name: Bömer, Franz
Publisher: name: Bonner Jahrbücher
Year: 2023

description: Bonner Jahrbücher, Bd. 152 (1952): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn