cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Strategies, Tactics, and Tools to Achieve Chemical Syntheses of cis-Clerodane Terpenoids
Creators: Ye, Qinda
Publisher: name: Columbia University
Year: 2015
Subjects: Chemistry
Chemistry, Organic

description: The clerodane diterpenoids are a large group of secondary metabolites that display an array of biological activities and structural diversity. This dissertation details our efforts to synthesize clerodane natural products through a unified design and the use of a key synthetic intermediate. Thus, Chapter 1 will serve to introduce this unique and interesting class of terpenoids, beginning with their proposed biosynthesis. This section will be followed by a highlight of their diverse biological activities. Lastly, a select collection of representative total syntheses will be described to provide a sense of the state of the art in accessing their molecular complexity. Next, Chapter 2 will begin with our design of a two-phase approach towards the clerodane family, followed by an introduction of scaparvin A as an excellent example of a target with complex architecture and multiple oxygenated functional groups worthy of synthetic and biological study. In addtion, a detailed retrosynthetic analysis of scaparvin A will be described based on our global strategy for accessing the family. Then, we will focus our discussion in Chapter 3 on the efficient construction of the common intermediate, while two modes of directed C–H oxidation to deliver the requisite oxidation state will be covered in Chapter 4. Finally, efforts of late-stage modification towards scaparvin A and related compounds will be summarized in Chapter 5, culminating in a near complete synthesis of scaparvin A as well as a completed total synthesis of scaparvin C.
Anisotropic massive Brans-Dicke gravity extension of the standard $Λ$CDM model
Creators: name: Akarsu, Ozgur
name: Katirci, Nihan
name: Ozdemir, Nese
name: Vazquez, J. Alberto
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present an explicit detailed theoretical and observational investigation of an anisotropic massive Brans-Dicke (BD) gravity extension of the standard $Λ$CDM model, wherein the extension is characterized by two additional degrees of freedom; the BD parameter, $ω$, and the present day density parameter corresponding to the shear scalar, $Ω_{σ^2,0}$. The BD parameter, determining the deviation from general relativity (GR), by alone characterizes both the dynamics of the effective dark energy (DE) and the redshift dependence of the shear scalar. These two affect each other depending on $ω$, namely, the shear scalar contributes to the dynamics of the effective DE, and its anisotropic stress --which does not exist in scalar field models of DE within GR-- controls the dynamics of the shear scalar deviating from the usual $\propto(1+z)^6$ form in GR. We mainly confine the current work to non-negative $ω$ values as it is the right sign --theoretically and observationally-- for investigating the model as a correction to the $Λ$CDM. By considering the current cosmological observations, we find that $ω\gtrsim 250$, $Ω_{σ^2,0}\lesssim 10^{-23}$ and the contribution of the anisotropy of the effective DE to this value is insignificant. We conclude that the simplest anisotropic massive BD gravity extension of the standard $Λ$CDM model exhibits no significant deviations from it all the way to the Big Bang Nucleosynthesis. We also point out the interesting features of the model in the case of negative $ω$ values; for instance, the constraints on $Ω_{σ^2,0}$ could be relaxed considerably, the values of $ω\sim-1$ (relevant to string theories) predict dramatically different dynamics for the expansion anisotropy.
description: 27 pages, 6 figures, 1 table
Thermogeometric study of van der Waals like phase transition in black holes: an alternative approach
Creators: name: Bhattacharya, Krishnakanta
name: Majhi, Bibhas Ranjan
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is well-known that the non-extremal anti-de-Sitter (AdS) black holes show various van der Waals type criticalities, such as the $P-V$, $T-S$, $Y-X$, $Q^2-Ψ$ etc. In these cases, the phase space diagram of the relevant quantities are similar in behaviour to the isotherms on $P-V$ diagram for the usual van der Waals gas system. The existing thermogeometric descriptions of these criticalities for the black holes deal with the whole thermogeometric manifold and its curvature. However, while observing the criticality, one only notices the behaviour of the relevant phase space variables and keep all other thermodynamic quantities as fixed. Therefore it is quite natural to investigate the geometrical behaviour of the induced metric, defined by these constant macroscopic variables, corresponding to the whole manifold of the thermogeometry. Using geometrothermodynamics (GTD), we precisely address this issue. It is observed that the extrinsic curvature of this induced metric also diverges at the critical point. This provides an alternative but important aspect of the thermogeometric description of phase transition of black holes. The entire formalism in this paper is very general as it is valid for any arbitrary black hole which shows the van der Waals type phase transition.
description: A few comments added, to appear in Phys. Lett. B
Fuzzy Surfaces of Genus Zero
Creators: name: Madore, J.
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A fuzzy version of the ordinary round 2-sphere has been constructed with an invariant curvature. We here consider linear connections on arbitrary fuzzy surfaces of genus zero. We shall find as before that they are more or less rigidly dependent on the differential calculus used but that a large number of the latter can be constructed which are not covariant under the action of the rotation group. For technical reasons we have been forced to limit our considerations to fuzzy surfaces which are small perturbations of the fuzzy sphere.
description: 11 pages, Latex
Diclis bambuseti R. E. Fr.
Creators: name: Zhou, Ya-Dong
name: Mwachala, Geoffrey
name: Hu, Guang-Wan
name: Wang, Qing-Feng
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Scrophulariaceae
Diclis
Diclis bambuseti

description: Diclis bambuseti R.E.Fr.  —
Habit: Herb.
Habitat: LMWF, Fb, B, E. Distribution: IIIa.
 Voucher: Near Mount Kenya Lodge, Alt. 2 958 m, 26 Jan. 2015, SAJIT 002874 (HIB).
 References: Bussmann (1993, 1994), Bussmann & Beck (1995a, 1998, 1999), Ghazanfar et al. (2008), Agnew (2013).
description: Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 82, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/6550464
Forward Jets and BFKL at Hadron Colliders
Creators: name: Andersen, Jeppe R.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present results on dijet and W+dijet production at hadron colliders obtained by supplementing the leading log BFKL resummation with energy and momentum conservation. For pure dijet production, the inclusion of the BFKL radiation in the energy conservation leads to a decrease in the parton flux sufficient to counter-act the expected exponential increase in the cross section obtained for the partonic cross section. Other BFKL signatures such as the dijet azimuthal angle decorrelation do still survive.
description: 5 pages, Presented at the X International Workshop on Deep Inelastic Scattering (DIS2002)
Bibliotopia
Creators: name: Velasco, Manon
name: Forclaz, Alexandra
name: Reichard, François
name: Jaggi, Ermeline
name: Saudou, Céline
name: Milfort, Frank
Publisher: name: Zenodo
Year: 2018
Subjects: scientific publishing
academic libraries history

description: Et si… à un moment clef de l’histoire des bibliothèques, un point de divergence était introduit, afin de créer un univers parallèle ?
Bounds on Precipitate Hardening of Line and Surface Defects in Solids
Creators: name: Courte, Luca
name: Bhattacharya, Kaushik
name: Dondl, Patrick
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35D40, 35Q74, 35R11, 35K93, 74C99

description: The yield behavior of crystalline solids is determined by the motion of defects like dislocations, twin boundaries and coherent phase boundaries. These solids are hardened by introducing precipitates -- small particles of a second phase. It is generally observed that the motion of line defects like dislocations are strongly inhibited or pinned by precipitates while the motion of surface defects like twin and phase boundaries are minimally affected. In this article, we provide insight why line defects are more susceptible to the effect of precipitates than surface defects. Based on mathematical models that describe both types of motion, we show that for small concentrations of a nearly periodic arrangement of precipitates, the critical force that is required for a surface defect to overcome a precipitate is smaller than that required for a line defect. In particular, the critical forces for surface and line defects scale with the radius of precipitates to the second and first power, respectively.
description: 17 pages, 3 figures
Web Accessibility Directive (WAD) ― How to be Compliant
Creators: name: WADcher Consortium
Publisher: name: Zenodo
Year: 2021
Subjects: web accessibility, observatory, monitoring body, design support environment, web accessibility directive

description: Booklet presenting an overview about the actual compliance requirements in the European Union because of the Web Accessibility Directive and the contributions of the WADcher project to facilitate these compliance requirements.
title: Isotope geochemistry of light hydrocarbons adsorbed in Jurassic shales from the Hils syncline, North-west Germany
Creators: name: Stahl, Wolfgang
Publisher: name: Goltze
Year: 1993
Subjects: subject: Brunsvicensien der Universitätsbibliothek Braunschweig
subject: Abhandlungen der BWG
subject: 55

description: The Hils syncline is situated in the south-western corner of the eastern part of the Lower Saxony Basin in which oil has been drilled since 1864. The geochemical data of the reservoired hydrocarbons are well known. In the eastern part of the Lower Saxony Basin, i.e. east of the river Weser, the only source rock of the oil is the Posidonia shale. This sediment, rich in organic matter of kerogen type II, was deposited under uniform anoxic conditions during the Toarcian and reached maturity levels in the oil and gas windows. At the rim of the Hils syncline, which extends to about 40km in NW-SE direction, the Posidonia shale crops out and shows the same range of maturation as the deeply buried Posidonia shale in the eastern part of the Lower Saxony Basin as a whole.
Five shallow wells with a depth of about 20m were drilled in the Hils syncline to get core samples from the Posidonia shale and from the shales directly overlying. Gaseous hydrocarbons adsorbed in these samples have been analysed and have been compared with the data set of the reservoired hydrocarbons from the eastern part of the Lower Saxony Basin.
The results of this study show that:
• Gases, adsorbed in the Posidonia shale or neighbouring younger shales of the Hils syncline originated from the Posidonia shale. Their isotopic patterns correspond to the isotopic data of oil-associated reservoir gases from the eastern part of the Lower Saxony Basin. Thus, the Hils syncline can be regarded as a model of the whole eastern part of the Lower Saxony Basin concerning the generation of hydrocarbons.
• The generation of the gaseous hydrocarbons in the shallow cores from the Hils area and of most of the oil-associated gases from the reservoirs of the eastern part of the Lower Saxony Basin must have taken place about 88 million years ago according to the thermal history of the Hils syncline.
• Migration of the light gaseous hydrocarbons from their source rocks to the reservoirs (secondary migration) did not drastically change the isotopic patterns of these gases, i.e. isotopic patterns of migrated gases carry information on source rock properties.
• Considerable amounts of isotopically light methane, ethane, and propane have been observed in many of the gases strongly adsorbed at the cores from the Hils syncline. Isotopically light ethane and propane are unusual.
Challenges with conducting tailings dam breach studies
Creators: name: Martin, Violeta
name: Fontaine, Daniel
name: Cathcart, Jaime Grant
Publisher: name: The University of British Columbia
Year: 2017

description: Engineering practitioners currently use a combination of guidance documents, published papers, and professional experience to support tailings dam breach and inundation studies. There is considerable knowledge and information available in this relatively new field of practice, but standardized and comprehensive guidelines specific to tailings dams are not available. Practitioners face several key challenges: (a) the more established and mature guidance is typically focused on water storage dams; (b) the available literature may only address specific aspects of dam breach assessment and inundation modelling; (c) the available literature sometimes relies on historical data that may not be consistent with the proposed application; and (d) the results are highly sensitive to the selected modelling inputs. This paper reflects on the currently available literature on dam breach and inundation studies, compares how the major components for these studies are approached, and discusses how the resulting conclusions may vary. Key aspects of tailings dam breach and inundation assessment typically considered include: initial conditions and hydrology; boundary conditions; breach parameters; tailings mobility and outflow volume; and flood routing and inundation mapping. This paper quantitatively compares several of the key parameters proposed by various authors and comments on the factors that control their applicability.
Strategic planning and urban development in New York City, Paris and Sao Paulo: 2001 – 2012
Creators: Lobo, Bruno
Publisher: name: Columbia University
Year: 2018
Subjects: subject: City planning
subject: Finance
subject: Architecture
subject: FOS: Civil engineering
subject: Strategic planning
subject: Urbanization--Government policy

description: This study examines the paradigm shift in urban planning towards a strategic spatial approach by investigating the effects of new strategic plans and policies on large-scale urban development projects (UDP’s). Specifically, it compares the impacts of new planning legislation and strategic local plans introduced in New York, Paris and Sao Paulo on three UDP’s in each city by evaluating the impacts on the development programs, implementation process and public benefits delivered from 2001 to 2012. The study provides an overview of the literature on strategic spatial planning theory and practice, comparative planning systems and large-scale urban public/ private developments to describe the overarching ‘spatial turn’ in planning and establish how different planning cultures influence plan making and what the consequences are for public/ private development, focusing on the mechanisms of flexibility provided by strategic plans to address the planning and financing requirements of UDP’s. It argues that despite of the formal differences found between systems as legal constructs, there is a need to investigate if these consequences actually occur and how they are produced. It then presents the case studies of the Special Hudson Yards District in New York City, the ‘Zone d’Amenagement Concerte Clichy-Batignolles’ in Paris and the ‘Operacao Urbana Agua Branca’ in Sao Paulo, focusing on the reform of the local statutes, planning process and implementation using quantitative and qualitative data collected through planning documents, press articles, interviews, observation of public meetings and field research. Each case study is representative of a different planning model where each project was developed after a revision of the local planning statutes and introduction of a new strategic city plan. The study finds that despite the formal differences between strategic plans, UDP’s cause planning systems to converge towards a similar intermediate model where policy determination becomes bidirectional and final development programs are determined by both strategic plans and site-specific considerations. The variations found between projects are instead determined by the broader development models present in each case which determine the implementation capacity of cities and ability to capitalize public resources to capture part of the resulting increment in land values and deliver public benefits. The study concludes with proposed implications for planning research and suggestions of policy formulations aimed at improving the ‘public return’ generated by UDP’s.
title: Neue Befunde zur Paläoklimatologie Nordafrikas und Zentralasiens
Creators: name: Hövermann, Jürgen
name: Lehmkuhl, F.
name: Süssenberger, H.
Publisher: name: Goltze
Year: 1993
Subjects: subject: Brunsvicensien der Universitätsbibliothek Braunschweig
subject: Abhandlungen der BWG
subject: 55

description: Auf der Grundlage des Systems der klimatischen Morphologie wird die Verlagerung der Formungsregionen während der letzten Eiszeit aus Feldbeobachtungen und der Auswertung von Satellitenbildern und Karten abgeleitet. In der nördlichen Sahara wie in Zentralasien sind die heutigen hyperariden Formungsbereiche durch die Südverlagerung der Pedimentregion verdrängt. Daraus läßt sich eine bedeutende Niederschlagsvermehrung ableiten. Die thermischen Verhältnisse sind nur für Zentralasien detaillierter zu erfassen. Eine präzisere zeitliche Einordnung wird auf der Grundlage jeweils mehr als 25.000 Jahre umfassender Zeitreihen vorgenommen. Demzufolge gehört die maximale Südverlagerung der Pedimentregion in den Zeitraum vor 25.000 B.P. Die nachfolgenden Klimaabschnitte sind in den verschiedenen Regionen unterschiedlich. Die Tendenz der Klimaentwicklung ist teilweise gegenläufig. Erst nach 10.000 B.P. stellt sich das aktuelle Klimagefüge mit extremer Trockenheit in den Wüsten und hoher Feuchtigkeit in den Tropen ein. Das Diagramm der in Zeit und Raum erfaßten Verlagerungen der Formungsregionen zeigt überraschende Zusammenhänge mit dem Kanon der Erdbestrahlung.
Pontania phylicifoliae Forsius 1919
Creators: name: Taeger, Andreas
name: París, Mercedes
name: Nieves-Aldrey, Jose Luis
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Pontania
Pontania phylicifoliae

description: Pontania phylicifoliae Forsius, 1919
A junior subjective synonym of Pontania arcticornis Konow, 1904, synonymy by Lindqvist (1955).
Types. Pontania phylicifoliae Forsius, 1919: 165–168. Syntypes ♂, ♀ “Typen … aus Helsingfors (durch Zucht erhalten; Cotypen aus Lojo und Karislojo).” Lectotype ♀ (Helsingfors, RFT, not examined), designated by Vikberg & Zinovjev (2006), a former designation by Kopelke (1991) is invalid. Paralectotypes not mentioned in Vikberg & Zinovjev (2006). In MNCN 1♂ paralectotype “Lojo” (MNCN_Ent 82343, MNCN Cat. Tipos Nº 10220).
description: Published as part of Taeger, Andreas, París, Mercedes & Nieves-Aldrey, Jose Luis, 2014, The type specimens of sawflies (Hymenoptera: Symphyta) of the Museo Nacional de Ciencias Naturales, Madrid, pp. 103-138 in Zootaxa 3790 (1) on page 128, DOI: 10.11646/zootaxa.3790.1.5, http://zenodo.org/record/4914035
title: Natur- und kulturgeographische Probleme des Mittelalters im nördlichen Harzvorland
Creators: name: Oberbeck, Gerhard
Publisher: name: Goltze
Year: 1993
Subjects: subject: Brunsvicensien der Universitätsbibliothek Braunschweig
subject: Abhandlungen der BWG
subject: 550
subject: 306

description: Anliegen der folgenden Ausführungen ist es, die Bergstadt und Kaiserstadt Goslar, die im Mittelpunkt des wissenschaftlichen Symposiums steht, regional innerhalb eines größeren Rahmens zu interpretieren. Dabei handelt es sich um ein Gebiet, das im Westen etwa durch das Leinetal, den Salzgitterer Höhenzug und die Linie über Hannover bis zum Allertal hin begrenzt ist und das im Osten durch den Raum um den Fallstein, Halberstadt und Quedlinburg charakterisiert wird. Im Norden sei als Grenze die Hauptentwässerungsrinne des Warthestadiums der Saale-Eiszeit, das heutige Aller-Weser-Urstromtal genannt.
Beabsichtigt ist, die historisch-geographische Entwicklung in dem physisch-geographischen Rahmen des nördlichen Harzvorlandes aufzuzeigen. Dabei geht es um die Ursachen, die Kräfte und Prozesse, die sich für die verschiedenen Zeitabstände dominierend ausgewirkt haben. Die Probleme, auf die im einzelnen einzugehen sein wird, wurzeln in der Frage, inwieweit sich während des Mittelalters die Naturlandschaft zur vorherrschend vom Menschen gestalteten Kulturlandschaft entwickelt hat. Dies bedeutet, daß aus naturgeographischer Sicht Blickpunkte des Untergrundes, u.a. der Geologie und der Tektonik, auch der Gewässerkunde und der fluviatilen Situation berücksichtigt werden müssen.
Die Verbindung zur Genese, die durch den Menschen stark beeinflußt worden ist, findet ihre Erklärung in historischen, siedlungsgeographischen sowie volkskundlichen Gegebenheiten; z.B. geht es um die Entwicklung der Struktur der ländlichen und der städtischen Siedlungen, ebenso von Wirtschaft und Verkehr.
Virtual concordance and the generalized Alexander polynomial
Creators: name: Boden, Hans U.
name: Chrisman, Micah
Publisher: name: arXiv
Year: 2019
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27

description: We use the Bar-Natan Zh-correspondence to identify the generalized Alexander polynomial of a virtual knot with the Alexander polynomial of a two component welded link. We show that the Zh-map is functorial under concordance, and also that Satoh's Tube map (from welded links to ribbon knotted tori in $S^4$) is functorial under concordance. In addition, we extend classical results of Chen, Milnor, and Hillman on the lower central series of link groups to links in thickened surfaces. Our main result is that the generalized Alexander polynomial vanishes on any knot in a thickened surface which is concordant to a homologically trivial knot. In particular, this shows that it vanishes on virtually slice knots. We apply it to complete the calculation of the slice genus for virtual knots with four crossings and to determine non-sliceness for a number of 5-crossing and 6-crossing virtual knots.
description: 32 pages, 24 figures
Hebenstretia angolensis Rolfe
Creators: name: Zhou, Ya-Dong
name: Mwachala, Geoffrey
name: Hu, Guang-Wan
name: Wang, Qing-Feng
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Scrophulariaceae
Hebenstretia
Hebenstretia angolensis

description: Hebenstretia angolensis Rolfe  —
Habit: Herb.
Habitat: LMDF, BZ, UMF, HZ, AZ; 1 400–4 100 m. Distribution: II.
 Voucher: Sirimon Track, Alt. 3096 m, 17 Jul. 2014, CPG 28387 (HIB, PE).
 References: Blundell (1987), Young & Peacock (1985), Bussmann (1993, 1994), Ghazanfar et al. (2008), Abdi (2013), Agnew (2013).
description: Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 82, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/6550464
Dynamical tunneling in optical cavities
Creators: name: Hackenbroich, Gregor
name: Noeckel, Jens U.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The lifetime of whispering gallery modes in a dielectric cavity with a metallic inclusion is shown to fluctuate by orders of magnitude when size and location of the inclusion are varied. We ascribe these fluctuations to tunneling transitions between resonances quantized in different regions of phase space. This interpretation is confirmed by a comparison of the classical phase space structure with the Husimi distribution of the resonant modes. A model Hamiltonian is introduced that describes the phenomenon and shows that it can be expected in a more general class of systems.
description: 8 pages LaTeX with 5 postscript figures
Limosella africana Gluck
Creators: name: Zhou, Ya-Dong
name: Mwachala, Geoffrey
name: Hu, Guang-Wan
name: Wang, Qing-Feng
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Scrophulariaceae
Limosella
Limosella africana

description: Limosella africana Glück  —
Habit: Herb.
Habitat: HZ, AZ; 1 500–4 400 m. Distribution: I.
 Voucher: Near Muckinder’s Lodge, Alt. 4 310 m, 4 Feb. 2015, SAJIT 003087 (HIB).
 References: Young & Peacock (1985), Bussmann (1993, 1994), Ghazanfar et al. (2008), Agnew (2013).
description: Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 82, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/6550464
usage.pdf file for: An a priori error estimate for a temporally discontinuous Galerkin space-time finite element method for linear elasto- and visco-dynamics
Creators: name: Shaw, Simon
Publisher: name: Brunel University London
Year: 2019
Subjects: subject: 10301 Numerical Analysis
subject: FOS: Mathematics

description: FEniCS python scripts for use in Docker or Anaconda for solving a dynamic linear Maxwell-Zener type of viscoelasticity problem using a piecewise linear discontinuous-in-time and continuous-in-space finite element method.
Interacting spreading processes in multilayer networks
Creators: name: Bródka, Piotr
name: Musial, Katarzyna
name: Jankowski, Jarosław
Publisher: name: arXiv
Year: 2019
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The world of network science is fascinating and filled with complex phenomena that we aspire to understand. One of them is the dynamics of spreading processes over complex networked structures. Building the knowledge-base in the field where we can face more than one spreading process propagating over a network that has more than one layer is a challenging task, as the complexity comes both from the environment in which the spread happens and from characteristics and interplay of spreads' propagation. As this cross-disciplinary field bringing together computer science, network science, biology and physics has rapidly grown over the last decade, there is a need to comprehensively review the current state-of-the-art and offer to the research community a roadmap that helps to organise the future research in this area. Thus, this survey is a first attempt to present the current landscape of the multi-processes spread over multilayer networks and to suggest the potential ways forward.
Analytic Continuation of Massless Two-Loop Four-Point Functions
Creators: name: Gehrmann, T.
name: Remiddi, E.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe the analytic continuation of two-loop four-point functions with one off-shell external leg and internal massless propagators from the Euclidean region of space-like $1\to 3$ decay to Minkowskian regions relevant to all $1\to 3$ and $2\to 2$ reactions with one space-like or time-like off-shell external leg. Our results can be used to derive two-loop master integrals and unrenormalized matrix elements for hadronic vector-boson-plus-jet production and deep inelastic two-plus-one-jet production, from results previously obtained for three-jet production in electron--positron annihilation.
description: 26 pages, LaTeX
Evaluation of total and inhalable samplers for the collection of carbon nanotube and carbon nanofiber aerosols
Creators: name: Dahm, Matthew M.
name: Evans, Douglas E.
name: Bertke, Stephen
name: Grinshpun, Sergey A.
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
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: 20199 Astronomical and Space Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy

description: A growing number of carbon nanotubes and nanofibers (CNT/F) exposure and epidemiologic studies have utilized 25- and 37-mm open-faced cassettes (OFCs) to assess the inhalable aerosol fraction. It has been previously established that the 37-mm OFC undersamples particles >20 µm in diameter, but the size-selective characteristics of the 25-mm OFC have not yet been fully evaluated. This article describes an experimental study conducted to determine if the 25- and 37-mm OFCs performed with relative equivalence to a reference inhalable aerosol sampler when challenged with CNT/F particles. Side-by-side paired samples were collected within a small Venturi chamber using a 25-mm styrene OFC, 37-mm styrene OFC, 25-mm aluminum OFC, and button inhalable aerosol sampler. Three types of CNT/F materials and an Arizona road dust were used as challenge aerosols for the various sampler configurations. Repeated experiments were conducted for each sampler configuration and material. The OFC samplers operated at flow rates of 2 and 5 L/min. Results showed that the 25-mm OFC performed comparably to the button sampler when challenged with CNT/F aerosols, which was demonstrated in five of the six experimental scenarios with an average error of 21%. Overall, the results of this study indicate that the sampling efficiency of the 25- and 37-mm OFCs adequately followed the ISO/ACGIH/CEN inhalable sampling convention when challenged with CNT/F aerosols. Past exposure and epidemiologic studies that used these OFC samplers can directly compare their results to studies that have used other validated inhalable aerosol samplers.
title: Zur kinematischen Geometrie der drei Grundaufgaben der Getriebelehre
Creators: name: Dizioglu, Bekir
Publisher: name: Goltze
Year: 1993
Subjects: subject: Brunsvicensien der Universitätsbibliothek Braunschweig
subject: Abhandlungen der BWG
subject: 62

description: In der ebenen Kinematik werden Vektoren mit Hilfe komplexer Zahlen dargestellt. In der vorliegenden Arbeit werden zunächst die drei Grundaufgaben der Getriebelehre in der ebenen wie auch in der räumlichen Getriebelehre behandelt. Die Lösung in der Ebene geschieht mit Hilfe komplexer Zahlen. Sind von den drei Kurven: Gangpolkurve, Rastpolkurve und Bahnkurve eines Punktes zwei vorgegeben, so läßt sich die dritte Kurve ermitteln.
Die entsprechenden drei Grundprobleme sind im Raum mit Hilfe der Achsenflächen und Bahnflächen formuliert worden.
Integrability and level crossing manifolds in a quantum Hamiltonian system
Creators: name: Stepanov, Vyacheslav V.
name: Muller, Gerhard
Publisher: name: arXiv
Year: 1998
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a two-spin model, represented classically by a nonlinear autonomous Hamiltonian system with two degrees of freedom and a nontrivial integrability condition, and quantum mechanically by a real symmetric Hamiltonian matrix with blocks of dimensionalities K=l(l+1)/2, l=1,2,... In the six-dimensional (6D) parameter space of this model, classical integrability is satisfied on a 5D hypersurface, and level crossings occur on 4D manifolds that are completely embedded in the integrability hypersurface except for some lower-D sub-manifolds. Under mild assumptions, the classical integrability condition can be reconstructed from a purely quantum mechanical study of level degeneracies in finite-dimensional invariant blocks of the Hamiltonian matrix. Our conclusions are based on rigorous results for K=3 and on numerical results for K=6,10.
description: 8 pages, 3 figures
Scaling and dynamics of turbulence over sparse canopies
Creators: name: Sharma, Akshath
name: García-Mayoral, Ricardo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Turbulent flows within and over sparse canopies are investigated using direct numerical simulations. We focus on the effect of the canopy on the background turbulence, the part of the flow that remains once the element-induced flow is filtered out. In channel flows, the distribution of the total stress is linear with height. Over smooth walls, the total stress is only the `fluid stress' $τ_f$, the sum of the viscous and the Reynolds shear stresses. In canopies, in turn, there is an additional contribution from the canopy drag, which can dominate within. We find that, for sparse canopies, the ratio of the viscous and the Reynolds shear stresses in $τ_f$ at each height is similar to that over smooth-walls, even within the canopy. From this, a height-dependent scaling based on $τ_f$ is proposed. Using this scaling, the background turbulence within the canopy shows similarities with turbulence over smooth walls. This suggests that the background turbulence scales with $τ_f$, rather than with the conventional scaling based on the total stress. This effect is essentially captured when the canopy is substituted by a drag force that acts on the mean velocity profile alone, aiming to produce the correct $τ_f$, without the discrete presence of the canopy elements acting directly on the fluctuations. The proposed mean-only forcing is shown to produce better estimates for the turbulent fluctuations compared to a conventional, homogeneous-drag model. The present results thus suggest that a sparse canopy acts on the background turbulence primarily through the change it induces on the mean velocity profile, which in turn sets the scale for turbulence, rather than through a direct interaction of the canopy elements with the fluctuations. The effect of the element-induced flow, however, requires the representation of the individual canopy elements.
description: 31 pages, 27 figures. Changes made to address reviewer comments. This article supersedes arXiv:1810.10028
On Gravitational Repulsion
Creators: name: Piran, Tsvi
Publisher: name: arXiv
Year: 1997
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations - small dimples in the primordial density field - that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and grow to become voids in the galaxy distribution. These voids - regions with a diameter of $40 \h$ Mpc which are almost devoid of galaxies - are the largest object in the Universe.
description: 10 pages, lates with 2 figures. Third prize in 1997 Gravity essay competition. ALso available from ftp://shemesh.fiz.huji.ac.il and http://shemesh.fiz.huji.ac.il
Strength and dendritic organization of thalamocortical synapses onto excitatory layer 4 neurons
Creators: Schoonover, Carl E.
Publisher: name: Columbia University
Year: 2013
Subjects: subject: Neurosciences
subject: FOS: Clinical medicine

description: The thalamus is a potent driver of cortical activity, even though cortical synapses onto layer 4 (L4) neurons outnumber thalamic synapses ten to one. Previous in vitro studies have suggested that enhanced efficacy of thalamocortical (TC) relative to corticocortical (CC) synapses explains the effectiveness of the thalamus. We investigated possible key anatomical and physiological differences between these inputs onto excitatory L4 neurons in vivo. We developed a high-throughput light microscopy method, validated by electron microscopy, to completely map the locations of synapses across an entire dendritic tree. This demonstrated that TC synapses are slightly more proximal to the soma than CC synapses, but detailed compartmental modeling predicted that dendritic filtering does not appreciably favor one synaptic class over another. Measurements of synaptic strength in intact animals revealed that both TC and CC synapses are weak and approximately equivalent. We conclude that thalamic potency relies, not on enhanced TC strength, but on coincident activation of converging inputs.
Street Harassment as a Genderless Concern in the Age of Technology
Creators: Boateng, Kalema
Publisher: name: Columbia University
Year: 2011
Subjects: subject: Psychology
subject: FOS: Psychology

description: This paper explores street harassment and its implications in society from the legal as well as personal consequences of the victimized subjects of street harassment to the gender norms and assumptions drawn from the issues regarding street harassment. Street harassment is not looked upon as a genderless issue but rather dichotomized between the victims being women and men being the attackers. The sources however vary in their language as well as target. Bowman (1993) suggests that women are the predominant targets of street harassment which causes them to be victimized in a double entendre which she names "ghettoization." Mui and Murphy (2002) demonstrate in their book of multiple essays that harassment in the public sphere embodies compound layers of issues regarding, race, class and gender. This paper attempts to examine the multitude of layers offered by Bowman (1993), Mui and Murphy (2002) while questioning how the role of technology Hollaback (2005) acts as an asset or hindrance to street harassment in order to conceptualize street harassment reform. If in fact we can decode the implications of street harassment by acknowledging its gendered assumptions we may begin to accept street harassment as a new age progressive movement.
Limosella macrantha R. E. Fr.
Creators: name: Zhou, Ya-Dong
name: Mwachala, Geoffrey
name: Hu, Guang-Wan
name: Wang, Qing-Feng
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Scrophulariaceae
Limosella
Limosella macrantha

description: Limosella macrantha R.E.Fr.  —
Habit: Herb.
Habitat: BZ, UMF, HZ, AZ, NZ; 2 400–4 500 m. Distribution: I.
 Voucher: Below the Meru Mount Kenya Lodge, Alt. 2 850 m, 12 Oct. 1985, Beentje 2427 (EA, K).
 References: Ghazanfar et al. (2008), Agnew (2013).
description: Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 82, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/6550464
Colour dipoles and deeply virtual Compton scattering
Creators: name: Sandapen, R.
Publisher: name: arXiv
Year: 2002
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I report on an analysis of Deeply Virtual Compton Scattering (DVCS) within the dipole model, done in collaboration with M. McDermott and G. Shaw. The two models considered here are distinct in their structure and implications. They both agree with the available cross-section data on DVCS from HERA. Predictions for various asymmetries are also given.
description: 5 pages, 8 eps figures, latex, uses appolb.cls, Talk given at the X International workshop on Deep Inelastic Scattering (DIS 2002), Krakow, 30 April-4 May 2002. To be published in Acta Physica Polonica B
Rigidity and Vanishing Theorems in K-Theory I
Creators: name: Liu, Kefeng
name: Ma, Xiaonan
name: Zhang, Weiping
Publisher: name: arXiv
Year: 1999
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Topology (math.AT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14D05, 57R91

description: In this paper, we first establish a K-theory version of the equivariant family index theorem for a circle action, then use it to prove several rigidity and vanishing theorems on the equivariant K-theory level.
description: 44 page
Stress and Rab35 modulate Alzheimer’s disease-related protein trafficking
Creators: Zhuravleva, Viktoriya
Publisher: name: Columbia University
Year: 2021
Subjects: subject: Neurosciences
subject: FOS: Clinical medicine
subject: Biology
subject: Molecular biology
subject: Alzheimer's disease--Research
subject: Stress (Physiology)
subject: Glucocorticoids

description: Chronic stress and elevated glucocorticoids (GCs), the major stress hormones, are risk factors for Alzheimer’s disease (AD) and promote AD pathomechanisms in animal models. These include overproduction of synaptotoxic amyloid-β (Aβ) peptides and intraneuronal accumulation of microtubule-associated protein Tau. Tau accumulation is linked to downregulation of the small GTPase Rab35, which mediates Tau degradation via the endolysosomal pathway. Whether Rab35 is also involved in stress/GC-induced Aβ overproduction remains an open question. Here, I find that hippocampal Rab35 levels are decreased not only by stress/GCs, but also by aging, another AD risk factor. Moreover, I show that Rab35 negatively regulates Aβ production by sorting amyloid precursor protein (APP) and β-secretase (BACE1) out of the endosomal network, where they interact to produce Aβ. Interestingly, Rab35 coordinates distinct intracellular trafficking events for BACE1 and APP, mediated by its effectors OCRL and ACAP2, respectively. Additionally, I show that Rab35 overexpression prevents the amyloidogenic trafficking of APP and BACE1 induced by GCs. Finally, I begin to investigate how GCs and/or Rab35 affect the intercellular spread of Aβ and Tau through exosomes. I describe methods for purifying exosomes and measuring their secretion from neurons, astrocytes, and microglial cells in order to determine the effects of stress/GCs and Rab35 on this process. These studies identify Rab35 as a key regulator of Alzheimer’s disease-related protein trafficking, and suggest that its downregulation contributes to stress- and AD-related pathomechanisms.
Oil sands tailings management projects : low return, business critical
Creators: name: Nicolaisen, Jennifer
Publisher: name: The University of British Columbia
Year: 2017

description: In 2014, Independent Project Analysis (IPA) led Alberta’s first industry research study on the performance of oil sands tailings management capital projects. Although the industry has organized extensively to investigate and share technology strategies for tailings management, the implementation of those strategies through capital projects had not been previously evaluated. The research study findings suggest that Alberta tailings projects still have a long way to go in terms of maximizing their value for business. The key findings from the research study, which include a cost-capacity model for benchmarking the base capital cost of an oil sands tailings management project, are presented here. Most importantly, we describe the root cause of ineffective investments in tailings management facilities and assets: business’ failure to prioritize these projects and provide the time and resources required for capital effectiveness. Further, we explore the importance and implications of capital effectiveness in oil sands tailings management investments. Although waste management and compliance projects deliver no direct financial return to the bottom line, the indirect returns yielded from the effective and responsible delivery of tailings management assets are critical to staying in business in the 21st century.
An explicit construction of the McKay correspondence for A-Hilb C^3
Creators: name: Craw, Alastair
Publisher: name: arXiv
Year: 2000
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: For a finite Abelian subgroup A of SL(3,C), Ito and Nakajima proved that the tautological bundles on the A-Hilbert scheme Y = A-Hilb(C^3) form a basis of the K-theory of Y. We establish the relations between these bundles in the Picard group of Y and hence, following a recipe introduced by Reid, construct an explicit basis of the integral cohomology of Y in one-to-one correspondence with the irreducible representations of A.
description: 25 pages, 20 figures
What GW170729's exceptional mass and spin tells us about its family tree
Creators: name: Kimball, Chase
name: Berry, Christopher P L
name: Kalogera, Vicky
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational-wave observations give a unique insight into the formation and evolution of binary black holes. We use gravitational-wave measurements to address the question of whether GW170729's source, which is (probably) the most massive binary and the system with the highest effective inspiral spin, could contain a black hole which is a previous merger remnant. Using the inferred mass and spin of the system, and the empirically determined population of binary black holes, we compute the evidence for the binary being second-generation compared with first-generation. We find moderate evidence (a Bayes factor of ~6-7) that the mass and spin better match a second-generation merger, but folding in the expectation that only a small fraction of mergers are second-generation, we conclude that there is no strong evidence that GW170729 was the result of a second-generation merger. The results are sensitive to the assumed mass distribution, and future detections will provide more robust reconstructions of the binary black hole population.
description: Results updated to match published version (conclusions unchanged); 3 pages, 1 figure