cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Accreting Millisecond X-ray Pulsar IGR J00291+5934: Evidence for a Long Timescale Spin Evolution
Creators: name: Patruno, Alessandro
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Accreting Millisecond X-ray Pulsars like IGR J00291+5934 are important because it is possible to test theories of pulsar formation and evolution. They give also the possibility to constrain gravitational wave emission theories and the equation of state of ultra dense matter. Particularly crucial to our understanding is the measurement of the long term spin evolution of the accreting neutron star. An open question is whether these accreting pulsars are spinning up during an outburst and spinning down in quiescence as predicted by the recycling scenario. Until now it has been very difficult to measure torques, due to the presence of fluctuations in the pulse phases that compromise their measurements with standard coherent timing techniques. By applying a new method, I am now able to measure a spin up during an outburst and a spin down during quiescence. I ascribe the spin up (Fdot=5.1(3)x10^{-13}\Hz/s) to accretion torques and the spin down (Fdot=-3.0(8)x10^{-15} Hz/s) to magneto dipole torques, as those observed in radio pulsars. Both values nicely fit in the recycling scenario and I infer the existence of a magnetic field for the pulsar of B~2x10^{8} G. No evidence for an enhanced spin down due to gravitational wave emission is found. The accretion torques are smaller than previously reported and there is strong evidence for an ordered process that is present in all outbursts that might be connected with a motion of the hot spot on the neutron star surface.
description: 12 Pages, 5 Figures, 7 Tables. Accepted for publication in The Astrophysical Journal
Segmentspanbildung, Werkzeugverschleiß, Randschichtzustand und Bauteileigenschaften: Numerische Analysen zur Optimierung des Zerspanungsprozesses am Beispiel von Ti-6Al-4V
Creators: name: Zanger, Frederik
Publisher: name: Karlsruhe
Year: 2012
Subjects: Zerspanung
Werkzeugverschleiß
Randschichtzustand
Bauteillebensdauer
Finite-Elemente-Methode (FEM)

description: Im Rahmen der Arbeit werden Simulationsmodelle vorgestellt, die ausgehend von Zerspanungssimulationen über die Simulation des Werkzeugverschleißes sowie der resultierenden Bauteilzustände und -eigenschaften eine ganzheitliche Prozessoptimierung ermöglichen. Diese zeigt, dass bei gezielter Prozessparameterwahl eine ideale Kombination aus Werkzeugstandzeit und resultierender Bauteileigenschaften erzielt werden kann. Mittels zerspanungstechnologischer Experimente werden die Modelle validiert.
Punk Journalism : searching for authenticity and identity in Robert Juan-Cantavella’s ‘El Dorado’
Creators: name: Miller, Austin
Publisher: name: University of British Columbia
Year: 2017

description: In his 2008 work El Dorado, author Robert Juan-Cantavella explores what it means to be ‘Spanish’ through what he claims to be a new genre called Punk Journalism. The protagonist (Juan-Cantavella's alter ego) claims that Punk Journalism is the bastard son of American author Hunter S. Thompson’s Gonzo Journalism. Several articles have been written about this work, but few have done so with academic rigor—most notably are Maria Egea’s De Las Vegas a Marina D’or. O como llegar desde el New Journalism norteamericano de Hunter S. Thompson hasta la nueva narrativa española de Robert Juan-Cantavella (2011) and Tanteos, calas y pesquisas en el dossier genético digital de ‘El Dorado’ de Robert Juan-Cantavella (2014) by Benédicte Vauthier. While these works tackle the events surrounding its publication—neither of them take a holistic study focused on the themes of authenticity and identity (pertaining to both the narrative, and the publication itself). The first part of this study focuses on the authenticity of the novel itself and serves to validate or discredit critic Maria Egea’s claim that Escargot’s literary creation, Punk Journalism, deserves to be considered “algo nuevo” (Egea 122). I accomplish this through comparative analysis, juxtaposing El Dorado with Fear and Loathing in Las Vegas (1971) while also addressing Maria Egea’s claims. The second part of this investigation reveals that identity is intrinsically linked to authority and power and that Escargot’s inability to pinpoint the identity of his nation is due more to a symptom of language than Spain itself. This study also finds that although Juan-Cantavella's work is a derivative of El Dorado, due to its scope, subjects, and style—Escargot does indeed achieve the creation of ‘something new.’ This newness comes to fruition through Escargot’s use of hyper self-awareness, extreme narrative experiments like switching from first person to third person omniscient at will, increased political commentary, and a more obvious desire to ‘trick’ the reader.
Optimization of the passive components of the Modular Multilevel Matrix Converter for Drive Applications
Creators: name: Kammerer, Felix
name: Kolb, Johannes
name: Braun, Michael
Publisher: name: Karlsruhe
Year: 2012

description: The Modular Multilevel Matrix Converter (M3C) is a new topology which extends the Modular Multilevel Converter (M2C) family for converters to low speed drive applications. The energy pulsation and therefore the amount of the installed capacitance is very important for the design of such a converter. This paper presents a method to estimate the required amount of capacitance for a given application. Additionally, the design of a newly proposed coupled z-winding arm inductor is explained. It is verified that the use of this inductor allows considerable savings of core and coil material.
Mesenchymal Stem Cells Induce Recovery After Stroke by Regulation of Inflammation and Oligodendrogenesis
Creators: name: Tobin, Matthew K
Publisher: name: University of Illinois at Chicago
Year: 2020
Subjects: Uncategorized

description: BACKGROUND: Brain repair mechanisms fail to promote recovery after stroke and approaches to induce brain regeneration are scarce. Mesenchymal stem cells (MSC) are thought to be a promising therapeutic option. However, their efficacy is not fully elucidated and the mechanism underlying their effect is not known. METHODS: The middle cerebral artery occlusion (MCAO) model was utilized to determine the efficacy of interferon-γ-activated mesenchymal stem cells (aMSCγ) as an acute therapy for stroke. aMSCγ were intravenously administered to rats three hours after MCAO and functional recovery was assessed using the modified Neurological Severity Score (mNSS), open field analysis, and magnetic resonance imaging. Alterations in post-stroke inflammation, neurogenesis, and oligodendrogenesis were analyzed using biochemical, immunofluorescence, and stereological techniques. Mass spectrometry was used to analyze the MSC secretome. RESULTS: Here we show that treatment with aMSCγ is a more potent therapy for stroke than naïve MSC (nMSC). aMSCγ treatment results in significant functional recovery assessed by the mNSS and open field analysis compared to vehicle-treated animals. aMSCγ-treated animals showed significant reductions in infarct size and inhibition of microglial activation. We show that aMSCγ treatment suppresses the hypoxia-induced microglial pro-inflammatory phenotype more effectively than treatment with nMSC. Importantly, treatment with aMSCγ induces recruitment and differentiation of oligodendrocyte progenitor cells to myelin-producing oligodendrocytes in vivo. To elucidate the mechanism underlying high efficacy of aMSCγ therapy, we examined the secretome of aMSCγ and compared it to nMSC. Intriguingly, we found that aMSCγ but not nMSC upregulate neuron-glia antigen 2, (NG2), an important extracellular signal and a hallmark protein of oligodendrocyte progenitor cells (OPCs). CONCLUSIONS: These results suggest that activation of MSC with interferon-γ induces a potent pro-regenerative, pro-myelinating, and anti-inflammatory phenotype of these cells, which increases the potency of aMSCγ as an effective therapy for ischemic stroke. The unraveling of the secretome of aMSCγ may help move the field towards a better understanding of the potential of MSCs as a therapy for stroke.
Zelluläres Adhäsionsverhalten auf strukturierten und biofunktionalisierten Oberflächen
Creators: name: Fichtner, Dagmar Stephanie
Publisher: name: Karlsruhe
Year: 2012
Subjects: funktionalisierte Oberflächen
E-Cadherin
murine embryonale Stammzellen

description: In der vorliegenden Arbeit wurden zwei Methoden zur Strukturierung von Oberflächen untersucht. Zum einen UV-bestrahlte Polystyrol-Oberflächen, auf die Gelatine adsorbierte, zum anderen das Microcontact Printing von Thiol-SAMs und die anschließende Kopplung verschiedener E-Cadherin-Ektodomänen über ihren SNAP-Tag. Beide Methoden wurden durch Zelladhäsionsassays auf ihre Funktionalität geprüft, u.a. auch auf die Kultivierung und den Erhalt von murinen embryonalen Stammzellen.
Quantum kinetic theory of the filamentation instability
Creators: name: Bret, A.
name: Haas, F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum electromagnetic dielectric tensor for a multi species plasma is re-derived from the gauge invariant Wigner-Maxwell system and presented under a form very similar to the classical one. The resulting expression is then applied to a quantum kinetic theory of the electromagnetic filamentation instability. Comparison is made with the quantum fluid theory including a Bohm pressure term, and with the cold classical plasma result. A number of analytical expressions are derived for the cutoff wave vector, the largest growth rate and the most unstable wave vector.
Effects of soil redox potential (Eh) and pH on growth of sunflower and wheat
Creators: name: Cottes, Jérémy
name: Saquet, Alix
name: Palayret, Ludovic
name: Husson, Olivier
name: Beghin, Robin
name: Deonie Allen
name: Scheiner, Javier
name: Cabanes, Cédric
name: Guiresse, Maritxu
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
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: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Plant Biology

description: Soil redox potential (Eh) and pH are fundamentals parameters for plants growth. Measuring soil Eh is essential but complex due to the lack of measurement reliability resulting from high temporal variability and metrological challenges. This paper proposes practical advancements for measuring Eh in aerobic soils using combined electrodes (improvements in methodology specific to cleaning electrodes, measurement time, cleaning the dataset). The study of soil Eh and pH on sunflower and wheat in pot experiments has highlighted the relationship between Ehcumul (Eh associated with a dimension of time) and the portion of porosity that is accessible to air. For reduced soil conditions, sunflower positively reacts to better aeration. Strong correlations exist between the duration of each potential range and the growth of sunflower. The study of sunflower growth in soil reveals extremely harmful impact resulting from too high and/or too low Eh values.
Two new seco-abietane type diterpenoids from the leaves of Isodon serra
Creators: name: Wang, Min
name: Zhong, Li-Li
name: Fu, Xiang-Xiang
name: Chen, Jun
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified

description: Two new seco-abietane type diterpenoids, named as isodonserra acid A and B (1–2), along with six known compounds, angustanoic acid A (3), epipalustric acid (4), raserrane (5), 7-methoxy coumarin (6), umbelliferone (7), and (−)-loliolide (8), were obtained from the leaves of Isodon serra. The new structures of compounds 1 and 2 were elucidated by analysing their 1D NMR, 2D NMR and HR-ESI-MS spectra. Compounds 1–8 showed moderate hepatoprotective activity against APAP-induced HepG2 cell injury with a cell survival rate from 50.4% to 78.7% at a concentration of 10 μM (p < .001, bicyclol as the positive drug, 71.7%).
Konstruktionsbarrieren in der Mikrosystemtechnik und deren Überwindung durch einen Funktionskatalog = Obstacles in Microsystems Design and Development of a Functions Catalogue
Creators: name: Börsting, Peter
Publisher: name: Karlsruhe
Year: 2012
Subjects: Kreativität
Skalierungsproblematik
MEMS
cognition
analogy
design catalogue
design methodology
creativity
scaling problems

description: The work describes problems in MEMS design that an engineer has to cope with in order to develop innovative systems. This work is shifting perspectives to focus on the design engineer as lynchpin in product development. Design support is substantiated by the development of a functions catalog. It can not only be used for system synthesis but can also be used to analyze systems. Therefore geometrical similarity search was adapted and connected to the functions catalog.
Five-dimensional super Yang-Mills theory from ABJM theory
Creators: name: Gustavsson, Andreas
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive five-dimensional super Yang-Mills theory from mass-deformed ABJM theory by expanding about $S^2$ for large Chern-Simons level $K$. We obtain the Yang-Mills coupling constant $g_{YM}^2 = 4π^2 R/K$. If we consider $S^3/{\mb{Z}_K}$ as a fiber bundle over $S^2$ then $R/K$ is the circumference of the fiber. The value on the coupling constant agrees with what one gets by compactifying M five-brane on that fiber. For this computation we take $R,K\to \infty$ while keeping $R/K$ at a fixed finite value. We also study mass deformed star-three-product BLG theory at K=1 and $R\to \infty$. In that limit we obtain Lorentz covariant supersymmetry variations and gauge variations of a non-Abelian tensor multiplet.
description: 46 pages
A Comparison of Supersymmetry Breaking and Mediation Mechanisms
Creators: name: de Alwis, S. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We give a unified treatment of different models of supersymmetry breaking and mediation from a four dimensional effective field theory standpoint. In particular a comparison between GMSB and various gravity mediated versions of SUSY breaking shows that, once the former is embedded within a SUGRA framework, there is no particular advantage to that mechanism from the point of view of FCNC suppression. We point out the difficulties of all these scenarios - in particular the cosmological modulus problem. We end with a discussion of possible string theory realizations.
description: Added clarifications and references, 20 pages
One novel alkaloid from the stems of Tinospora crispa
Creators: name: Huang, Fengmei
name: Gongpan, Pianchou
name: Ji, Kailong
name: Zhou, Lan
name: Song, Qishi
name: Fan, Qingfei
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified

description: The 6-methoxy-cannabisin I (1), a new alkaloid, together with five known compounds oleraisoindole A (2), cannabisin F (3), apigenin (4), syringin (5) and ethyl-syringin (6) were isolated from Tinospora crispa stems. Their structures were identified by the analysis of spectroscopic data. Compound 2 was isolated from T. crispa for the first time. Anti-inflammatory activity of compound 1 was detected against NO production in LPS-activated RAW 264.7 macrophages. However, no activity was observed.
Search for Resonant Top Quark Pair Production in the Muon+Jets Channel with the CMS Detector
Creators: name: Ott, Jochen
Publisher: name: Karlsruhe
Year: 2012

description: This thesis presents a search for resonant top quark pair production in the muon+jets channel at CMS, using the 2011 dataset of proton-proton collisions at sqrt(s)=7TeV with a luminosity of 5.0/fb. No excess over standard model backgrounds is found and exclusion limits on resonances decaying to top quark pairs are set.
Simulating the next generation of the ATLAS inner detector : tracking in dense environments
Creators: name: Cormier, Felix
Publisher: name: University of British Columbia
Year: 2017

description: This document provides a thorough overview of an emulation method for new generation ATLAS Inner Detector design and optimization. The new ATLAS Inner Detector, named ITk, will track charged particles from proton-proton collision at record speed and flux, requiring a a thorough optimisation of its silicon sensors to perform within specifications inside these challenging dense environments consisting of very high momentum particles, collimated particles. The TIDETester emulation presented here is a fast simulation able to quickly simulate the effects of varying ITk geometries and analyse the track performance in order to inform layout decisions. A variety of Inner Detector layouts are studied, and results are obtained showing an improvement in dense environment tracking performance up to 10% when changing long strips to smaller pixels, and a small performance improvement up to 6% when using thinner pixel elements, from 150 μm to 25 μm. Changes in strip length between 23.82 and 47.64 μm were found to have no effect on dense environment tracking performance, while the two proposed pixel sizes of 50 × 50 and 25 × 100 μm were found to be equivalent in performance. Negligible performance improvement were found by moving the last three pixel layers as much as 10 mm from the interaction point, while moving strip layers back as much as 100 mm was found to have a modest improvement in performance, up to 10%.
Dependence of direct detection signals on the WIMP velocity distribution
Creators: name: Green, Anne M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The signals expected in WIMP direct detection experiments depend on the ultra-local dark matter distribution. Observations probe the local density, circular speed and escape speed, while simulations find velocity distributions that deviate significantly from the standard Maxwellian distribution. We calculate the energy, time and direction dependence of the event rate for a range of velocity distributions motivated by recent observations and simulations, and also investigate the uncertainty in the determination of WIMP parameters. The dominant uncertainties are the systematic error in the local circular speed and whether or not the MW has a high density dark disc. In both cases there are substantial changes in the mean differential event rate and the annual modulation signal, and hence exclusion limits and determinations of the WIMP mass. The uncertainty in the shape of the halo velocity distribution is less important, however it leads to a 5% systematic error in the WIMP mass. The detailed direction dependence of the event rate is sensitive to the velocity distribution. However the numbers of events required to detect anisotropy and confirm the median recoil direction do not change substantially.
description: 21 pages, 7 figures, v2 version to appear in JCAP, minor changes
Nonperturbative studies of supersymmetric matrix quantum mechanics with 4 and 8 supercharges at finite temperature
Creators: name: Hanada, Masanori
name: Matsuura, So
name: Nishimura, Jun
name: Robles-Llana, Daniel
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We investigate thermodynamic properties of one-dimensional U(N) supersymmetric gauge theories with 4 and 8 supercharges in the planar large-N limit by Monte Carlo calculations. Unlike the 16 supercharge case, the threshold bound state with zero energy is widely believed not to exist in these models. This led A.V. Smilga to conjecture that the internal energy decreases exponentially at low temperature instead of decreasing with a power law. In the 16 supercharge case, the latter behavior was predicted from the dual black 0-brane geometry and confirmed recently by Monte Carlo calculations. Our results for the models with 4 and 8 supercharges indeed support the exponential behavior, revealing a qualitative difference from the 16 supercharge case.
description: 16 pages, 7 figures, LaTeX2e, minor corrections in section 3, final version accepted in JHEP
When Chile Faces the Otherness: Aporophobia and Racism in the New Migratory Policy of Chile through Transnational Lenses
Creators: name: Caroca González, Felipe Gabriel
Publisher: name: Global Histories: A Student Journal
Year: 2022

description: In 2018, the Chilean president Sebastián Piñera launched a new migration policy that changed the situation in Chile for all current and prospective migrants. This paper addresses these new migration norms in Chile by focusing on how racism and aporophobia form the basis of new imaginaries towards "otherness". These circumstances are a direct consequence of the transnational migration phenomenon or South-South migration that Latin America, since the end of the twentieth century, has experienced. Therefore, this work will provide a global perspective of this migratory phenomenon in order to explain contemporary and contradictory narratives about migrants. Here, through an analysis of newspapers, a journalistic discourse is constructed in which the government and various social actors, such as religious and human rights institutions, contrast, contradict, and highlight the objective of this new policy by displaying its discriminatory characteristics.
description: Global Histories: A Student Journal, Vol. 7 No. 2 (2021): Global histories 7 (2)
Observation of metastable hcp solid helium
Creators: name: Souris, Fabien
name: Grucker, Jules
name: Dupont-Roc, Jacques
name: Jacquier, Philippe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have produced and observed metastable solid helium-4 below its melting pressure between 1.1 K and 1.4 K. This is achieved by an intense pressure wave carefully focused inside a crystal of known orientation. An accurate density map of the focal zone is provided by an optical interferometric technique. Depending on the sample, minimum density achieved at focus corresponds to pressures between 2 and 4 bar below the static melting pressure. Beyond, the crystal undergoes an unexpected instability much earlier than the predicted spinodal limit. This opens a novel opportunity to study this quantum crystal in an expanded metastable state and its stability limits.
description: deuxi\`eme version
Two new alkaloids from the endophytic fungus Aspergillus fumigatus SAS10 isolated from the mangrove tree Sonneratia apetala
Creators: name: Chen, Zanhong
name: Liu, Haisheng
name: Ding, Bo
name: Guo, Siyu
name: Huang, Hongbo
name: Tao, Yiwen
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified

description: Two new alkaloids designated aspernigrin E (1) and pyranonigrin L (2) were isolated from mangrove endophytic fungus Aspergillus fumigatus SAS10, together with the known alkaloid compounds pyranonigrin A (3), asperazine (4), (+)-iso-pestalazine A (5), pestalazine A (6), and pestalazine B (7). The planar structures of the new compounds were elucidated by HR-MS and NMR spectroscopic data analyses. The absolute configurations of compounds 1 and 2 were determined by comparison of the electronic circular dichroic (ECD) spectra with the calculated ECD spectra. All these compounds were tested for anti-bacterial activity.
Enhancement of Diffusive Transport by Nonequilibrium Thermal Fluctuations
Creators: name: Donev, A.
name: de la Fuente, A.
name: Bell, J. B.
name: Garcia, A. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the contribution of advection by thermal velocity fluctuations to the effective diffusion coefficient in a mixture of two identical fluids. The steady-state diffusive flux in a finite system subject to a concentration gradient is enhanced because of long-range correlations between concentration fluctuations and fluctuations of the velocity parallel to the concentration gradient. The enhancement of the diffusive transport depends on the system size L and grows as \ln(L/L_{0}) in quasi-two dimensional systems, while in three dimensions it grows as L_{0}^{-1}-L^{-1}, where L_{0} is a reference length. The predictions of a simple fluctuating hydrodynamics theory, closely related to second-order mode-mode coupling analysis, are compared to results from particle simulations and a finite-volume solver and excellent agreement is observed. We elucidate the direct connection to the long-time tail of the velocity autocorrelation function in finite systems, as well as finite-size corrections employed in molecular dynamics calculations. Our results conclusively demonstrate that the nonlinear advective terms need to be retained in the equations of fluctuating hydrodynamics when modeling transport in small-scale finite systems.
description: Draft; please send comments to corresponding author. For a concise summary, see arXiv:1103.5532
Reward Estimation of Risk Sensitive Agents via Gradient Based Inverse Reinforcement Learning
Creators: name: Sandrelli, Federico
Publisher: name: University of Illinois at Chicago
Year: 2020
Subjects: Uncategorized

description: In a standard Reinforcement Learning problem, an agent learns how to act in an environment in order to maximize some function of the return called the Objective Function. While this might be optimal for most use cases, there are scenarios in which it might be useful to include some notion of risk in the agent’s objective. For example, a car learning how to drive itself should avoid heading full speed towards a wall, just because it hasn’t tried that yet. This issue has brought to more conservative approaches for exploration, with Risk-Averse Reinforcement Learning. The literature offers many examples of risk measures used to train risk-sensitive agents, such as the Conditional Value at Risk, the Sharpie Ratio and Mean-Variance. In other scenarios instead, the agent learns through observation rather than through experience. Given demonstrations form an expert, the agent learns its objective function through which it can formulate an effective behaviour. The core of our thesis is to merge two fundamental concepts within Reinforcement Learning: Risk-Aversion and the Inverse optimization problem. The idea consists of assuming a Risk-Averse expert who is minimizing some notion of Risk and we want to retrieve the behavior of the expert deriving the reward function and the degree of his Risk- Aversion. In this work, we assume to have an expert that is maximizing the Mean-Variance Objective Function. In the second chapter of this document, the reader will find a comprehensive overview of the Reinforcement Learning framework, starting from the more basic concepts and gradually building up to the main focus of the work which is Risk Averse Inverse Reinforcement Learning. This is followed by the literature on this topic, focusing in particular on the papers that have inspired this project. Finally, the innovative section of the research is presented, along with the specifications of the algorithm and the experiments and empirical proofs. The last chapter is left for our final remarks and thoughts about future improvements and implementations of the work.
Ergodic transitions in continuous-time random walks
Creators: name: Saa, Alberto
name: Venegeroles, Roberto
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences
subject: 82B41

description: We consider continuous-time random walk models described by arbitrary sojourn time probability density functions. We find a general expression for the distribution of time-averaged observables for such systems, generalizing some recent results presented in the literature. For the case where sojourn times are identically distributed independent random variables, our results shed some light on the recently proposed transitions between ergodic and weakly nonergodic regimes. On the other hand, for the case of non-identical trapping time densities over the lattice points, the distribution of time-averaged observables reveals that such systems are typically nonergodic, in agreement with some recent experimental evidences on the statistics of blinking quantum dots. Some explicit examples are considered in detail. Our results are independent of the lattice topology and dimensionality.
description: 8 pages, final version to appear in PRE
A New Hybrid N-Body-Coagulation Code for the Formation of Gas Giant Planets
Creators: name: Bromley, Benjamin C.
name: Kenyon, Scott J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We describe an updated version of our hybrid N-body-coagulation code for planet formation. In addition to the features of our 2006-2008 code, our treatment now includes algorithms for the 1D evolution of the viscous disk, the accretion of small particles in planetary atmospheres, gas accretion onto massive cores, and the response of N-bodies to the gravitational potential of the gaseous disk and the swarm of planetesimals. To validate the N-body portion of the algorithm, we use a battery of tests in planetary dynamics. As a first application of the complete code, we consider the evolution of Pluto-mass planetesimals in a swarm of 0.1-1 cm pebbles. In a typical evolution time of 1-3 Myr, our calculations transform 0.01-0.1 solar mass disks of gas and dust into planetary systems containing super-Earths, Saturns, and Jupiters. Low mass planets form more often than massive planets; disks with smaller alpha form more massive planets than disks with larger alpha. For Jupiter-mass planets, masses of solid cores are 10-100 Earth masses.
description: revised version; 52 pages, 1 table, 19 figures; accepted in ApJ
Cross-platform data integrity and confidentiality with graduated access control
Creators: name: Chen, Feifan
Publisher: name: University of British Columbia
Year: 2017

description: Security of data is tightly coupled to its access policy. However, in practice, a data owner has control of his data’s access policies only as far as the boundaries of his own systems. We introduce graduated access control, which provides mobile, programmable, and dynamically-resolving policies for access control that extends a data owner’s policies across system boundaries. We realize this through a novel data-centric abstraction called trusted capsules and its associated system, the trusted data monitor. A trusted capsule couples data and policy into a single mobile unit. A capsule is backwards-compatible and is indistinguishable from any regular file to applications. In coordination with the trusted data monitor, a capsule provides data integrity and confidentiality on remote devices, strong authentication to a trusted capsule service, and supports nuanced and dynamic access control decisions on remote systems. We implemented our data monitor using ARM TrustZone. We show that graduated access control can express novel and useful real world policies, such as revocation, remote monitoring, and risk-adaptable disclosure. We illustrate trusted capsules for different file formats, including JPEG, FODT, MP4 and PDF. We also show compatibility with unmodified applications such as LibreOffice Writer, Evince, GpicView and VLC. In general, we found that applications operating on trusted capsules have varying performance, which depends on file size, application access patterns, and policy complexity.
Powerful antioxidants within Cupressus arizonica Greene female cones and leaves essential oil
Creators: name: Hosseinihashemi, Seyyed Khalil
name: Barzegari, Fatemeh
name: Baseri, Hadi
name: Barbosa, Luiz Claudio Almeida
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: The composition and antioxidant activity of the essential oil obtained from the female cones and leaves of Cupressus arizonica were assessed using the DPPH assay. The total oil yields obtained through hydrodistillation from the female cones and leaves were 1.9% (v/w) and 0.65% (v/w), respectively. The GC-MS chemical analysis of the oils from the female cones and leaves resulted in the identification of 17 and 45 compounds, respectively. Moreover, the essential oils obtained from C. arizonica female cones were predominantly composed of monoterpene hydrocarbons, with α-pinene being the most abundant component at 72.20%. In contrast, the oil extracted from the leaves was rich in oxygenated monoterpenes, particularly umbellulone (17.33%). The oils extracted from the leaves exhibited remarkable DPPH radical scavenging activity, displaying a value of 95.6%. This value was comparable to that of ascorbic acid (99.6%) and BHT (96.9%) when tested at a concentration of 59 mg/mL.
Development of Microactuators Based on the Magnetic Shape Memory Effect
Creators: name: Yeduru, Srinivasa Reddy
Publisher: name: Karlsruhe
Year: 2013

description: The giant magneto-strain effect in Ni-Mn-Ga alloys is particularly attractive for actuator applications. Two different approaches are being pursued to develop MSM microactuators. To observe large deflections of Ni-Mn-Ga microactuators, the material should be exhibiting low twinning stress and large magnetic anisotropy. In addition, design rules and boundary conditions for operating the Ni-Mn-Ga actuator material are having significant importance for evolution of performance characteristics.
Avoiding Unintended Flows of Personally Identifiable Information - Enterprise Identity Management and Online Social Networks
Creators: name: Labitzke, Sebastian
Publisher: name: Karlsruhe
Year: 2013
Subjects: Enterprise Identity and Access Management
SAML
Online Social Networks
Big Data Analytics

description: This dissertation addresses potentially occurring unintended flows of personally identifiable information (PII) within two fields of research, i.e., enterprise identity management and online social networks. For that, we investigate which pieces of PII can how often be gathered, correlated, or even be inferred by third parties that are not intended to get access to the specific pieces of PII. Furthermore, we introduce technical measures and concepts to avoid unintended flows of PII.
Das erweiterte X-in-the-Loop-Framework zur durchgängigen Integration von Optimierungsverfahren in den Produktentwicklungsprozess am Beispiel der Entwicklung energieeffizienter Fahrzeuge = The advanced X-in-the-Loop-Framework for continuous integration of optimization procedures into the product development process using examples of the development of fuel efficient vehicles
Creators: name: Schröter, Jens
Publisher: name: Karlsruhe
Year: 2013
Subjects: erweiterte X-in-the-Loop-Framework
Optimierung

description: Die Anforderungen an die Individualmobilität steigen weiter an: So erwartet der Konsument innovative Fahrzeuge - bei gleichbleibenden Kosten. Gleichzeitig muss gesetzesinduziert die Abgasemission weiter reduziert und im Hinblick auf die schwindenden Ressourcen der Kraftstoffverbrauch gesenkt werden. Deshalb wird in der vorliegenden Arbeit das erweiterte X-in-the-Loop-Framework zur durchgängigen Integration von Optimierungsverfahren in den Produktentwicklungsprozess entwickelt und validiert.
R-symmetry Matching In SUSY Breaking Models
Creators: name: Goodman, Jessica
name: Ibe, Masahiro
name: Shirman, Yuri
name: Yu, Felix
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Low energy descriptions of metastable supersymmetry breaking models often possess an accidental R-symmetry. Viable phenomenological applications of this class of models require R-symmetry to be broken in the ground state. This can be achieved in O'Raifeartaigh-like models where some of the chiral superfields carry negative R-charges. In this paper we consider UV completions of this class of models and formulate necessary conditions that they must satisfy. We show that the R-symmetry of the IR description can be traced to an anomalous or anomaly-free R-symmetry of the UV theory and discuss several representative examples.
description: 15 pages, 3 figures; v2, typo corrected, references added, published version
Humboldt Forum - Global History in Berlin Global
Creators: name: Ng, Ka Laam
Publisher: name: Global Histories: A Student Journal
Year: 2022

description: This is a museum review of Humboldt Forum's first permanent exhibition - Berlin Global. This review explores the exhibition's attempts to show globalism in Berlin's history. Most importantly, it assesses if the exhibition narration responds to postcolonialism and Eurocentrism, which have been criticised by Global History.
description: Global Histories: A Student Journal, Vol. 7 No. 2 (2021): Global histories 7 (2)
Efficient Logic-Based Information Flow Analysis of Object-Oriented Programs
Creators: name: Ruch, Fabian
Publisher: name: Karlsruhe
Year: 2013

description: In this thesis, the JavaDL logic is amended by a new modality for the verification of termination-insensitive, object-sensitive, flow-sensitive noninterference of memory locations in object-oriented programs, that is local variables and heap object fields. Noninterference is a security model applied in information flow analysis and the amended JavaDL logic improves the information flow analysis of Java Card programs using the JavaDL sequent calculus. JavaDL formulae are a superset of first-order logic formulae and the logic additionally contains dynamic logic modalities as well as a concept called updates for the transition and evaluation of Java Card program states. Noninterference of memory locations is a property of programs and the respective pairs of start and end states of their executions.
The satisfaction of the property implies that a particular set of memory locations does not interfere with the memory locations not included in this set. A set of memory locations does not interfere with another set if the evaluations of the included memory locations in the end state of any execution are independent of the evaluations of the memory locations included in the other set.
Noninterference in Java Card programs has already been formulated and verified in JavaDL by a concept called self-composition which compares the end states of two independent executions of the same program with respect to a particular set of memory locations. This investigation is realisable with the means provided by JavaDL, in particular the dynamic logic modalities. However, in many cases the double execution poses unnecessary proof overhead and the new modality defined in this thesis aims at reducing this overhead. The new calculus reaches this goal by partially interpreting the verified program on a single execution path. As soon as this execution path branches the calculus must return to self-composition or the analysis loses precision.
Narrative Ethics in Contemporary German Minority Writing: Abbas Khider, Sherko Fatah, Rafik Schami
Creators: name: Faulk, David
Publisher: name: University of Illinois at Chicago
Year: 2020
Subjects: Uncategorized

description: This study examines three narratives by contemporary minority writers who write in the German language: Die Orangen des Präsidenten (2011) by Abbas Khider, Im Grenzland (2001) by Sherko Fatah, and Die Sehnsucht der Schwalbe (2002) by Rafik Schami. By analyzing these texts through a framework of narrative ethics that relies on the work of narratologists such as Wayne Booth, James Phelan, Seymour Chatman, and Monika Fludernik, this study seeks to understand readers’ possible ethical responses. The framework of narrative ethics sheds light on how these texts function to prompt a reader’s open-ended exploration of ethical issues. This study is a first of its kind, not for its methodology, which has long existed in the realm of canonical literatures, but for the intersection of methodology and subject matter. It seeks to show that narrative ethics has a role — perhaps a particularly fertile one — when used to explore German language texts written by writers from migrant backgrounds. In the field of minority and migrant German literature, it aims to refocus attention on the reader’s experience with texts by exploring whether such texts achieve the often-stated goal (which was advanced by early promoters of migrant literature in the 1980s and is still prevalent in the marketing of this literature today) of allowing readers to explore Otherness.
A multi-domain hybrid method for head-on collision of black holes in particle limit
Creators: name: Chakraborty, Debananda
name: Jung, Jae-Hun
name: Khanna, Gaurav
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Physics (physics.comp-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A hybrid method is developed based on the spectral and finite-difference methods for solving the inhomogeneous Zerilli equation in time-domain. The developed hybrid method decomposes the domain into the spectral and finite-difference domains. The singular source term is located in the spectral domain while the solution in the region without the singular term is approximated by the higher-order finite-difference method. The spectral domain is also split into multi-domains and the finite-difference domain is placed as the boundary domain. Due to the global nature of the spectral method, a multi-domain method composed of the spectral domains only does not yield the proper power-law decay unless the range of the computational domain is large. The finite-difference domain helps reduce boundary effects due to the truncation of the computational domain. The multi-domain approach with the finite-difference boundary domain method reduces the computational costs significantly and also yields the proper power-law decay. Stable and accurate interface conditions between the finite-difference and spectral domains and the spectral and spectral domains are derived. For the singular source term, we use both the Gaussian model with various values of full width at half maximum and a localized discrete $δ$-function. The discrete $δ$-function was generalized to adopt the Gauss-Lobatto collocation points of the spectral domain. The gravitational waveforms are measured. Numerical results show that the developed hybrid method accurately yields the quasi-normal modes and the power-law decay profile. The numerical results also show that the power-law decay profile is less sensitive to the shape of the regularized $δ$-function for the Gaussian model than expected. The Gaussian model also yields better results than the localized discrete $δ$-function.
description: 25 pages; published version (IJMPC)
(In)Visible Histories: Postcolonial Histories of Gender and Sexuality through the Lens of South African Visual Activism
Creators: name: Medina Godoy, Diana Vanesa
Publisher: name: Global Histories: A Student Journal
Year: 2022

description: This article investigates the work of South African photographer and visual activist Zanele Muholi. I argue that what makes their visual project successful is a multiple engagement with the different histories and discourses that inform Black queer identities and experiences in South Africa. For this, I focus on a little-discusses image called ID Crisis from 2003, a black and white photograph of a Black woman binding her breasts. Using this picture as a starting point, the article explores the ways in which Muholi’s photography brings viewers into contact with transnational histories of Black queerness, from Western colonialism to the apartheid in South Africa. Throughout this discussion, I use the idea of (in)visibility as a guiding concept, understood as a simultaneous visibility and invisibility that allows Muholi to allude to several historical narratives without directly reproducing them. As such, it is this (in)visible articulation of history that allows Muholi to engage with Black queer histories and re-contextualise them from a Black queer perspective.
description: Global Histories: A Student Journal, Vol. 7 No. 2 (2021): Global histories 7 (2)
Bioactive compounds by UHPLC-MS/MS and molecular networking from Myrceugenia foveolata
Creators: name: de Sousa, Matheus H. O.
name: Freitas, Marta S. D.
name: Cesca, Karina
name: Pilau, Eduardo J.
name: Porto, Carla
name: de Moura, Neusa F.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Plant Biology

description: Myrceugenia foveolata, commonly known as ‘guamirim’, was analysed using UHPLC-MS/MS and molecular networking. Hydroalcoholic extracts of leaves and stem bark were obtained using ethanol:water (70:30) as solvent. Chemical composition of the extracts was identified using UHPLC-MS/MS and tested for antioxidant activity and growth inhibition against E. coli, S. aureus, L. monocytogenes and S. enterica. Ten compounds were tentatively identified in the extracts including myricitrin, quercitrin, and betulin (in leave extracts), and avicularin, kaemferol-3-O-arabinopyroniside, 2”-O-galloylquercitrin and the acid triterpenes ursolic, sumaresinolic, asiatic and maslinic (in both extracts). Both extracts showed similar antioxidant activities, phenolic composition, and growth inhibition. The most pronounced response was observed against L. monocytogenes, with a growth inhibition rate of 73% to leaves extract and 65% do stem bark extract