cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effects of spatial data resolution on the modelling and mapping of soil organic carbon content in hill country grassland landscapes
Creators: name: Tran, Duy
name: Dominati, Estelle
name: Lowry, John
name: Mackay, Alec
name: Vibart, Ronaldo
name: Pearson, Diane
name: Devantier, Brian
name: Noakes, Emma
Publisher: name: AgResearch
Year: 2023
Subjects: classificationCode: 4106
subject: Soil sciences
classificationCode: 410601
subject: Land capability and soil productivity

description: Limited use has been made of spatially explicit modelling of soil organic carbon (SOC) in highly complex farmed landscapes to advance current mapping efforts. This study aimed to address this gap in knowledge by evaluating the spatial prediction of SOC content in the 0–75 mm soil depth in hill country landscapes in New Zealand (NZ) using point-based training data, along with topographic covariates and Sentinel 2 spectral band ratios using an automated set of machine learning (AutoML) tools in ArcGIS. Subsequently, it also focused on quantifying the effects of spatial data resolution (i.e., 1, 8, 15, and 25 m) in terms of predicted map accuracy. Farmlets with contrasting phosphorus fertilizer and sheep grazing histories located at the Ballantrae Hill Country Research Station, NZ were selected to conduct the research. Six candidate algorithms incorporated in the AutoML tools (i.e., XGBoost, LightGBM, linear regression, decision trees, extra trees, random forest) and ensemble model were utilized to model the spatial pattern of SOC content. The results show that the ensemble model that combine predictions of various algorithms applied for 1 m data resolution enables the highest performance and accuracy (i.e., R2 = .76, RMSE = 0.66%). Among the predictive variables used in the model, slope, wetness, and topographic position indices were found to be the most important topographical features that explain SOC patterns in the study area. Inclusion of spectral indices derived from remote sensing, including surface soil moisture and clay minerals ratio, made further improvement to the SOC content prediction. The study reveals that a decrease in the resolution of the geospatial data does not substantively affect the mean SOC content estimation of a farm-scale modelling. However, using coarser resolution data reduces the ability of the model to predict changes in the spatial pattern of SOC content across a hill country grassland landscape.NZBIDA
Replicability Survey Data Visualization
Creators: name: Holler, Joseph
name: Yifei Luo
name: Bardin, Sarah
name: Kedron, Peter
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Epistemology
subject: Geographic Research Methods
subject: Replicability
subject: Replicable Research

description: Interactive Shiny App Data Visualization of Survey Results
High-rate axial-field ionization chamber for particle identification of radioactive beams
Creators: name: Vadas, J.
name: Singh, Varinderjit
name: Visser, G.
name: Alexander, A.
name: Hudan, S.
name: Huston, J.
name: Wiggins, B. B.
name: Chbihi, A.
name: Famiano, M.
name: Bischak, M. M.
name: deSouza, R. T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The design, construction and performance characteristics of a simple axial-field ionization chamber suitable for identifying ions in a radioactive beam are presented. Optimized for use with low-energy radioactive beams (< 5 MeV/A) the detector presents only three 0.5 $μ$m/cm$^2$ foils to the beam in addition to the detector gas. A fast charge sensitive amplifier (CSA) integrated into the detector design is also described. Coupling this fast CSA to the axial field ionization chamber produces an output pulse with a risetime of 60-70 ns and a fall time of 100 ns, making the detector capable of sustaining a relatively high rate. Tests with an $α$ source establish the detector energy resolution as $\sim$8 $\%$ for an energy deposit of $\sim$3.5 MeV. The energy resolution with beams of 2.5 and 4.0 MeV/A $^{39}$K ions and the dependence of the energy resolution on beam intensity is measured. At an instantaneous rate of 3 x 10$^5$ ions/s the energy resolution has degraded to 14% with a pileup of 12%. The good energy resolution of this detector at rates up to 3 x 10$^5$ ions/s makes it an effective tool in the characterization of low-energy radioactive beams.
description: 7 pages, 8 figures
Absence of localization in two-dimensional Clifford circuits
Creators: name: Farshi, Tom
name: Richter, Jonas
name: Toniolo, Daniele
name: Pal, Arijeet
name: Masanes, Lluis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze a Floquet circuit with random Clifford gates in one and two spatial dimensions. By using random graphs and methods from percolation theory, we prove in the two dimensional setting that some local operators grow at ballistic rate, which implies the absence of localization. In contrast, the one-dimensional model displays a strong form of localization characterized by the emergence of left and right-blocking walls in random locations. We provide additional insights by complementing our analytical results with numerical simulations of operator spreading and entanglement growth, which show the absence (presence) of localization in two-dimension (one-dimension). Furthermore, we unveil that the spectral form factor of the Floquet unitary in two-dimensional circuits behaves like that of quasi-free fermions with chaotic single particle dynamics, with an exponential ramp that persists till times scaling linearly with the size of the system. Our work sheds light on the nature of disordered, Floquet Clifford dynamics and its relationship to fully chaotic quantum dynamics.
description: 16 pages, 11 figures. v2: Minor revisions of abstract, intro and conclusions. Results unchanged. Accepted by PRX Quantum
The catch-22 of stigma : identity, context and stereotype fear at work
Creators: name: Trau., Raymond Nam Cam
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Vom Habsburger zum Polen:
Creators: name: Will, Alexander
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Josef Pomiankowski’s book “The Collapse of the Ottoman Empire“ („Der Zusammenbruch des Ottomanischen Reiches“) is one of the most valuable sources for the late history of the Ottoman Empire. However little is known about the author. Yet Josef Pomiankowski is an archetypal example of a member of the Austro-Hungarian military elite who had to adapt to the new realities of post-war Europe. First of all the paper examines the making of a high ranking Austro-Hungarian officer of Polish decent. Moreover it attempts to show how this transnational identity was forced to yield during the formation of the Polish Republic, when Pomiankowski once more served as a high ranking officer. Pomiankowski’s example demonstrates that the nationalization of the continent was by no means seen as an act of liberation by all members of the elites in the new national states, but that there was also much sorrow for the destruction of the multinational Austro-Hungarian Monarchy among these elites.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Unravelling the complex structure of AGN-driven outflows: II. Photoionization and energetics
Creators: name: Karouzos, Marios
name: Woo, Jong-Hak
name: Bae, Hyun-Jin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Outflows have been shown to be prevalent in galaxies hosting luminous active galactic nuclei (AGNs) and present a physically plausible way to couple the AGN energy output with the interstellar medium of their hosts. Despite their prevalence, accurate characterization of these outflows has been challenging. In the second of a series of papers, we use Gemini Multi-Object Spectrograph IFU data of 6 local (z<0.1) and moderate-luminosity Type 2 AGNs to study the ionization properties and energetics of AGN-driven outflows. We find strong evidence that connect the extreme kinematics of the ionized gas with the AGN photoionization. The kinematic component related to the AGN-driven outflow is clearly separated from other kinematic components, such as virial motions or rotation, on the velocity and velocity dispersion diagram. Our spatially resolved kinematic analysis reveals that from 30% up to 90% of the total mass and kinetic energy of the outflow is contained within the central kpc of the galaxy. The spatially integrated mass and kinetic energy of the gas entrained in the outflow correlates well with the AGN bolometric luminosity and results in energy conversion efficiencies between 0.01% and 1%. Intriguingly, we detect ubiquitous signs of ongoing circumnuclear star formation. Their small size, the centrally contained mass and energy, and the universally detected circumnuclear star formation cast doubts on the potency of these AGN-driven outflows as agents of galaxy-scale negative feedback.
description: 25 pages, 15 figures, revised manuscript after minor referee comments, to be published in ApJ
Magnetic-Flux-Flow Diagrams for Design and Analysis of Josephson Junction Circuits
Creators: name: Wang, Yongliang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Josephson junction circuits, such as superconducting quantum interference devices (SQUIDs) and single-flux-quantum (SFQ) circuits, have been applied in both analog and digital systems for their ultralow-noise, high-speed, and power-efficient features. However, their analyses are not well supported by the conventional circuit diagrams and the charge-based analysis methods, due to the Josephson effects and flux quantization phenomena. This article introduces a type of magnetic-flux-flow (MFF) diagrams for the design and analysis of Josephson junction circuits. The MFF diagram of a Josephson junction circuit is the graphical expression of circuit equations. It not only gives the behaviors of Josephson junctions and superconducting loops new physical meanings, but also visualizes how the flux quanta are transferred among superconducting loops. The advantages of MFF diagrams are demonstrated in the design and analysis of typical Josephson junction circuits. It is shown that the MFF diagram and flux-based analysis method are the indispensable complement to the conventional circuit methodologies for Josephson junction circuits.
description: 7 pages, 19 figures
Bewegte Erinnerung.
Creators: name: Eder, Barbara
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: This article is concerned with processes of retroactive memory-construction in graphic novels by Marjane Satrapi, Parsua Bashi and Zeina Abirached. These ,autofictional’ works of female migrant graphic novel-authors, currently living in exile, expand a one-dimensional image of emigration by actively involving the reader into the process of producing meaning. Dimensions of temorality such as past, present and future are intermingled within a vast Stream of Comicness, shuttleing between words and images. What historical science literally as well as figuratively can gain by an analysis of these pictorial modes of representation, is a deep understanding of highly individualized acts of remembrance of a vicarious past, disfractured by the loss of time and space and constantly shifting between image and imagination.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Proposal for a long-lived quantum memory using matter-wave optics with Bose-Einstein condensates in microgravity
Creators: name: Da Ros, Elisa
name: Kanthak, Simon
name: Sağlamyürek, Erhan
name: Gündoğan, Mustafa
name: Krutzik, Markus
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Bose-Einstein condensates are a promising platform for optical quantum memories, but suffer from several decoherence mechanisms, leading to short memory lifetimes. While some of these decoherence effects can be mitigated by conventional methods, density dependent atom-atom collisions ultimately set the upper limit of quantum memory lifetime to s-timescales in trapped Bose-Einstein condensates. We propose a new quantum memory technique that utilizes microgravity as a resource to minimize such density-dependent effects. We show that by using optical atom lenses to collimate and refocus the freely expanding atomic ensembles, in an ideal environment, the expected memory lifetime is only limited by the quality of the background vacuum. We anticipate that this method can be experimentally demonstrated in Earth-bound microgravity platforms or space missions, eventually leading to storage times of minutes and unprecedented time-bandwidth products of {$10^{10}$}
description: 8 pages, 4 figures
Dissidenz im Comic
Creators: name: Van Laak, Jeannette
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: The article analyses entanglements of political and generational experience in the German Democratic Republic of the 90s. Furthermore, the potential of images, especially comic book panels, for conceptualizing historical terminology is discussed with regard to “dissidence”.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Managing an invisible diversity characteristic : religion in the workplace
Creators: name: Thomson., Stanley Bruce
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
„Der Krieg sind wir“ –
Creators: name: Brandt, Susanne
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: “Only if you understand war, will you find the murderer“, said Kris, the author of Notre Mère la Guerre. The comic tells the story of a serial killer who brutally murders four young women in the winter of 1915 in the French Champagne region. The comic is at first appearance a crime story. However, the authors Kris and Maël offer the reader a well-researched, manifold and terrifying panorama of World War I. During extensive research in archives and museums, the authors have studied the main historical works about World War I, as well as research works about the brutalization of politics between the wars. “We wanted to make war comprehensible to the readers; we wanted the readers to immerse themselves slowly and deeply into the question of what war really is. For us, the question is not only who is the murderer, but, most essentially, why does he kill?” (Übersetzung Anja Fulle)
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
SAGER checklist for article: Intimate Partner Violence and Emotional Exhaustion: A Female Gender Perspective in the University Environment
Creators: name: Meneses-La-Riva, Monica Elisa
name: Di Deus Ocupa-Meneses, Giovanni
name: Fernández-Bedoya, Víctor Hugo
name: Suyo-Vega, Josefina Amanda
name: Hitler Giovanni Ocupa-Cabrera
name: Di Deus Ocupa-Meneses, Benjamin
Publisher: name: Zenodo
Year: 2023

description: SAGER checklist for article: Intimate Partner Violence and Emotional Exhaustion: A Female Gender Perspective in the University Environment
Systematic analysis of doubly charmed baryons $Ξ_{cc}$ and $Ω_{cc}$
Creators: name: Yu, Guo-Liang
name: Li, Zhen-Yu
name: Wang, Zhi-Gang
name: Lu, Jie
name: Yan, Meng
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we perform a systematic study of the mass spectra, the root mean square(r.m.s.) radii and the radial density distributions of the doubly charmed baryons $Ξ_{cc}$ and $Ω_{cc}$. The calculations are carried out in the frame work of Godfrey-Isgur (GI) relativized quark model, where the baryon is regarded as a real three-body system of quarks. Our results show that the excited energy of doubly charmed baryon with $ρ$-mode is lower than those of the $λ$-mode and $λ$-$ρ$ mixing mode, which indicates that the lowest state is dominated by the $ρ$-mode. According to this conclusion, we systematically investigate the mass spectra, the r.m.s. radii of the ground and excited states($1S\sim4S$, $1P\sim4P$, $1D\sim4D$, $1F\sim4F$ and $1G\sim4G$) with $ρ$-mode. Using the wave functions obtained from quark model, we also study the radial density distributions. Finally, with the predicated mass spectra, the Regge trajectories of $Ξ_{cc}$ and $Ω_{cc}$ in the ($J$,$M^{2}$) plane are constructed, and the slopes, intercepts are determined by linear fitting. It is found that model predicted masses fit nicely to the constructed Regge trajectories.
Auf den Spuren der Digedags.
Creators: name: Lobmeier, Kornelia
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: The comic „Hannes Hegen’s Mosaik“ was an anomaly in the East German press scene. The officials of the state party SED were afraid of the political influence comics from the West could exert on young people. Therefore, a “socialist picture story” made in the GDR was to replace the comic books from the USA and Western Europe. The “Mosaik”, however, did not comply with the SED ideology. This essay describes how “Mosaik” was able to survive and prosper in a comichostile environment.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Was ist ein „Geschichtscomic“?
Creators: name: Dolle-Weinkauff, Bernd
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: This contribution deals with the problems of classification of a certain type of the graphic narrative (comics, manga and graphic novel) as a genre of historical storytelling. Starting with the idea that the single fact of treating historic details, characters and objects as such cannot be seen as a prove of a historical tale, it is necessary to leave aside all comics narrations that only present a few historic fragments. With the focus on those stories that show a continuous historic plot there has to be made a difference between factual narrations with a strong attitude of authenticity and often a didactic purpose on one side and fictional narrations which are trying to find an adequate balance between historical facts and literary invention on the other side. Among these, apart from gag strips with a historical content and examples of humorous historical storytelling as a persiflage, like Astérix and others, there are two types of historical comics narrations: with reference to Umbero Ecos categories that he presented in the “Postscript to ‘The name of the rose’”, the historical narration in comics, manga and graphic novels can be described as appearing either in the form of the historic novel or the historical adventure story. However, from these true variations of the genre the form of the comics romance with more or less superficial historical applications in often fantastic combinations – like Fosters “Prince Valiant” and others – has to be distinguished as it tends to create fantasy stories more than such of historical quality.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Adjoint Variable Method for Transient Nonlinear Electroquasistatic Problems
Creators: name: Ruppert, M. Greta
name: Späck-Leigsnering, Yvonne
name: Buschbaum, Julian
name: De Gersem, Herbert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences
subject: G.1.8; J.2

description: Many optimization problems in electrical engineering consider a large number of design parameters. A sensitivity analysis identifies the design parameters with the strongest influence on the problem of interest. This paper introduces the adjoint variable method as an efficient approach to study sensitivities of nonlinear electroquasistatic problems in time domain. In contrast to the more common direct sensitivity method, the adjoint variable method has a computational cost nearly independent of the number of parameters. The method is applied to study the sensitivity of the field grading material parameters on the performance of a 320 kV cable joint specimen, which is modeled as a Finite Element nonlinear transient electroquasistatic problem. Special attention is paid to the treatment of quantities of interest, which are evaluated at specific points in time or space. It is shown that shown that the method is a valuable tool to study this strongly nonlinear and highly transient technical example.
description: 13 pages, 8 figures
What Can Algebraic Topology and Differential Geometry Teach Us About Intrinsic Dynamics and Global Behavior of Robots?
Creators: name: Albu-Schäffer, Alin
name: Sachtler, Arne
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Traditionally, robots are regarded as universal motion generation machines. They are designed mainly by kinematics considerations while the desired dynamics is imposed by strong actuators and high-rate control loops. As an alternative, one can first consider the robot's intrinsic dynamics and optimize it in accordance with the desired tasks. Therefore, one needs to better understand intrinsic, uncontrolled dynamics of robotic systems. In this paper we focus on periodic orbits, as fundamental dynamic properties with many practical applications. Algebraic topology and differential geometry provide some fundamental statements about existence of periodic orbits. As an example, we present periodic orbits of the simplest multi-body system: the double-pendulum in gravity. This simple system already displays a rich variety of periodic orbits. We classify these into three classes: toroidal orbits, disk orbits and nonlinear normal modes. Some of these we found by geometrical insights and some by numerical simulation and sampling.
Lattice Instability of UTe$_2$ Studied by Ultrasonic Measurements
Creators: name: Ushida, Keita
name: Yanagisawa, Tatsuya
name: Hibino, Ruo
name: Matsuda, Masato
name: Hidaka, Hiroyuki
name: Amitsuka, Hiroshi
name: Knebel, Georg
name: Flouquet, Jacques
name: Aoki, Dai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The elastic constants of an unconventional superconductor, UTe$_2$, were investigated using ultrasound. In this paper, we report the elastic response of the normal state at temperatures down to 2 K and up to 14 T for $H \parallel b$ at ambient pressure. The transverse ultrasonic mode $C_{55}$, which corresponds to the strain susceptibility of $\varepsilon_{zx}$, shows softening with decreasing temperature, whereas the $C_{44}$ and $C_{33}$ modes do not show such softening. This clear mode dependence strongly suggests that UTe$_2$ has a lattice instability for this specific symmetry.
description: Proceedings of 29th International Conference on LOW TEMPERATURE PHYSICS
Lotka-Volterra predator-prey model with periodically varying carrying capacity
Creators: name: Swailem, Mohamed
name: Täuber, Uwe C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We study the stochastic spatial Lotka-Volterra (LV) model for predator-prey interaction subject to a periodically varying carrying capacity. The LV model with on-site lattice occupation restrictions that represent finite food resources for the prey exhibits a continuous active-to-absorbing phase transition. The active phase is sustained by spatio-temporal patterns in the form of pursuit and evasion waves. Monte Carlo simulations on a two-dimensional lattice are utilized to investigate the effect of seasonal variations of the environment on species coexistence. The results of our simulations are also compared to a mean-field analysis. We find that the parameter region of predator and prey coexistence is enlarged relative to the stationary situation when the carrying capacity varies periodically. The stationary regime of our periodically varying LV system shows qualitative agreement between the stochastic model and the mean-field approximation. However, under periodic carrying capacity switching environments, the mean-field rate equations predict period-doubling scenarios that are washed out by internal reaction noise in the stochastic lattice model. Utilizing visual representations of the lattice simulations and dynamical correlation functions, we study how the pursuit and evasion waves are affected by ensuing resonance effects. Correlation function measurements indicate a time delay in the response of the system to sudden changes in the environment. Resonance features are observed in our simulations that cause prolonged persistent spatial correlations. Different effective static environments are explored in the extreme limits of fast- and slow periodic switching. The analysis of the mean-field equations in the fast-switching regime enables a semi-quantitative description of the stationary state.
description: 18 pages, 20 figures, to appear in Phys. Rev. E (2023)
Finance and macroeconomic fluctuations
Creators: name: Tharavanij., Piyapas
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Verflochtene Vergangenheiten:
Creators: name: Kesper-Biermann, Sylvia
name: Severin-Barboutie, Bettina
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Providing the introduction to this special issue, the article explores, in three steps, history comic books as a field of research that has so far been neglected by transnational history. First, it highlights the significance of cross-border impacts on comics and enquires into transnational exchange and demarcation processes. Thus, the usual, often unconsciously nationalised focus on the three main, i.e. US, Japanese and French-Belgian, comic cultures is challenged and it is asked for a closer look at so far disregarded areas. Second, history comic books are characterised by entanglements between facts and fiction, the overlap of different time layers and transnational crossings. It is argued that Germany during the second half of the 20th century constitutes a particularly suitable object for studying these issues, since it can be characterised as “a site for intercultural exchange” with regard to picture books representing the past. The third part eventually points out prospects for future research in history comic books as entangled pasts.
description: Comparativ, Vol 24 No 3 (2014): Verflochtene Vergangenheiten: Geschichtscomics in Europa, Asien und Amerika
Graph Convolutional Network-based Feature Selection for High-dimensional and Low-sample Size Data
Creators: name: Chen, Can
name: Weiss, Scott T.
name: Liu, Yang-Yu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Feature selection is a powerful dimension reduction technique which selects a subset of relevant features for model construction. Numerous feature selection methods have been proposed, but most of them fail under the high-dimensional and low-sample size (HDLSS) setting due to the challenge of overfitting. In this paper, we present a deep learning-based method - GRAph Convolutional nEtwork feature Selector (GRACES) - to select important features for HDLSS data. We demonstrate empirical evidence that GRACES outperforms other feature selection methods on both synthetic and real-world datasets.
description: 24 pages, 4 figures, 4 tables
Multiagent Reinforcement Learning for Autonomous Routing and Pickup Problem with Adaptation to Variable Demand
Creators: name: Garces, Daniel
name: Bhattacharya, Sushmita
name: Gil, Stephanie
name: Bertsekas, Dimitri
Publisher: name: arXiv
Year: 2022
Subjects: subject: Multiagent Systems (cs.MA)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We derive a learning framework to generate routing/pickup policies for a fleet of autonomous vehicles tasked with servicing stochastically appearing requests on a city map. We focus on policies that 1) give rise to coordination amongst the vehicles, thereby reducing wait times for servicing requests, 2) are non-myopic, and consider a-priori potential future requests, 3) can adapt to changes in the underlying demand distribution. Specifically, we are interested in policies that are adaptive to fluctuations of actual demand conditions in urban environments, such as on-peak vs. off-peak hours. We achieve this through a combination of (i) an online play algorithm that improves the performance of an offline-trained policy, and (ii) an offline approximation scheme that allows for adapting to changes in the underlying demand model. In particular, we achieve adaptivity of our learned policy to different demand distributions by quantifying a region of validity using the q-valid radius of a Wasserstein Ambiguity Set. We propose a mechanism for switching the originally trained offline approximation when the current demand is outside the original validity region. In this case, we propose to use an offline architecture, trained on a historical demand model that is closer to the current demand in terms of Wasserstein distance. We learn routing and pickup policies over real taxicab requests in San Francisco with high variability between on-peak and off-peak hours, demonstrating the ability of our method to adapt to real fluctuation in demand distributions. Our numerical results demonstrate that our method outperforms alternative rollout-based reinforcement learning schemes, as well as other classical methods from operations research.
description: 8 pages, 6 figures, 3 tables, accepted to ICRA 2023
„Sozialismus war für mich auch Glaubenssache.“
Creators: name: Kenzler, Marcus
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: „For me, socialism was partly a matter of faith”. On representations of Latin-America and the use of Christian imagery in the art of the GDR Latin-American art and culture as well as political and social developments in that region had a major impact on creative work in the GDR. A peculiarity of the Latin-American influence was the utilization of motifs and symbols from Christian iconography. Artists from all disciplines and generations used this form of expression establishing a pictorial world in GDR art that seemed to contradict the atheist credo of the SED. The application of Christian imagery did not necessarily result from religious conviction but rather from the deep roots of religious visual expressions in the European tradition, the commitment to the ideals of humanism, and an assumed comparability of Christian and socialistic ideology. In addition, complex socio-political processes and issues could be addressed in a clear and comprehensible way by way of this emblematic and allegoric pictorial language. To some extent, Christian symbolism lent the aura of holy mission to liberation struggles. This is how, for example, the crucifixion functioned as an expression for martyrdom, innocent suffering and heroic sacrificial death; also, the Pietá – vividly portrayed in Werner Tübke’s Chilean Requiem – mourns and represents the victims of militarism and fascist violence in Latin America as martyrs. Artworks suggested now and again a similarity in appearance and character between Jesus Christ and Ernesto “Che” Guevara – with the aim of presenting Guevara as the modern messiah of the 20th century. The utilization of Christian iconography occasionally served as a means of self-reflexion and self-questioning and in some cases expressed a longing for a democratic and humane socialism as an antithesis to the political dictates of the SED.
description: Comparativ, Vol 24 No 4 (2014): Doing culture under state-socialism: Actors, events and interconnections
Fundamental Quanta
Creators: name: Whitefoot, Alan D.
Publisher: name: Zenodo
Year: 2023
Subjects: electron geometry
toroidal electron
electron radii
massless quanta
physical quanta
spherical quanta
fundamental quanta
action at a distance
instantaneous action

description: Some brief ideas about physical, fundamental quanta are presented. The quantum is proposed to be a massless, inert, rigid sphere. Quanta make up all particles. Space must be filled with quanta, but the degree to which space is filled with quanta is not proposed here. Because quanta are massless and perfectly rigid, simple changes of motion due to collisions will be instantaneous, if not immediately impeded by collisions with other moving quanta. Thus, instantaneous action at a distance can occur across the diameter of a quantum.
description: PDF export from a Maple document
Polnische Filmplakate aus transnationaler Sicht.
Creators: name: Harder, Jeannine
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Polish Film Posters from a Transnational Perspective. The Roots of the „Polish School of Poster“ in the 1950s. Through the example of post-war film posters, the article reveals how the reception of Polish poster art in non-socialist countries influenced, to some degree, the strategies of Polish foreign cultural policy and vice versa in the 1950s. Breaking with a nationally-oriented research tradition for poster art, the so called “Polish School of Poster Art” shall be understood as a transnational phenomenon, generated in the realm of (foreign) cultural politics and international graphic design and advertising. Regarding the production and reception of film posters of the “Polish School…” as an “histoire croisée”, the article analyses this visual material in the context of an international discourse on cinema advertising in the 1950s. At the same time, the Polish poster art is examined as a political instrument in shaping foreign relations with non-socialist countries.
description: Comparativ, Vol 24 No 4 (2014): Doing culture under state-socialism: Actors, events and interconnections
Transfers, Netzwerke und produktive Missverständnisse:
Creators: name: Esch, Michael
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Transfers, Networks, and Productive Misunderstandings: Plastic People, Velvet Underground, and the Relations Between Western and Eastern Dissidence 1965–1978 The history of pop and rock music and related youth subcultures in the ČSSR and especially the Prague underground have traditionally been depicted as a story of a somewhat repressed transfer, where youngsters inspired by western pop cultural promises of freedom tried to rebel against the sinister authorities of their homeland. Following, in a transnational perspective, the history of one particularly important underground band, the Plastic People of the Universe, the article nevertheless argues that the Prague underground defined itself as part of a cultural revolutionary movement rejecting the consumerist aspects of both eastern and western societies. The study also shows that an assessment of the Prague underground as merely receptive, imitative of western role (and musical) models is erroneous. The relationship between the new popular and underground music and their respective subcultures in the West and in Prague is more adequately described in terms of appropriation and invention triggered by what young rebels encountered through official and unofficial media. Czech actors used elements of western underground culture for purposes of self-expression because they perceived these as reactions to phenomena and problems comparable to what they experienced in their own lives. Nonetheless, when two Plastic People musicians were convicted in 1977, the political and religious opposition organised around Charta 77 regarded and represented them as anticommunist dissidents. This alliance between organised dissidence and the hippie underground did not last very long, yet it impacted both on the band’s (musical) practices and their image within the western musical underground as critiques of the socialist system.
description: Comparativ, Vol 24 No 4 (2014): Doing culture under state-socialism: Actors, events and interconnections
Central Europe in Manhattan:
Creators: name: Harms, Victoria
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Mitteleuropa mitten in Manhattan. Warum sich New Yorker Intellektuelle für ungarische Dissidenten interessierten Seit Ende der 1970er Jahre erhielten immer mehr osteuropäische, besonders ungarische Oppositionelle Stipendien für mehrmonatige Aufenthalte in New York City. Dieser Essay erforscht die Hintergründe für das Interesse amerikanischer Intellektueller an den Dissidenten aus Osteuropa. Die Analyse konzentriert sich auf die Fellows des Institute for the Humanities an der New York University, die ebenfalls zu den Kreisen um die New York Review of Books und die 978 gegründete U.S. Helsinki Watch Group gehörten. Als diese Intellektuellen György Konrád persönlich kennen lernen, beginnt ein regelmässiger Austausch zwischen New York und Budapest. Auf der einen Seite bedeutet die internationale Solidarität für die Osteuropäer Stipendien, Veröffentlichungsmöglichkeiten und Schutz vor den heimischen Regimen. Auf der anderen Seite bestätigt sie die Wiederbelebung des klassischen liberalen – nicht neokonservativen – Antikommunismus zur Zeit der Präsidentschaft Reagans in den USA. Darüberhinaus erlaubt es die Freundschaft mit Gleichgesinnten hinter dem Eisernen Vorhang den New Yorkern, nicht nur ihre ästhetische Vorliebe für das fin-de-siècle auszuleben, sondern auch ihre eigenen Wurzeln als Kinder osteuropäischer, oft jüdischer Immigranten wiederzuentdecken.
description: Comparativ, Vol 24 No 4 (2014): Doing culture under state-socialism: Actors, events and interconnections
Eastern Europe Under Western Eyes.
Creators: name: Sasvári, Edit
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Osteuropa durch westlichen Blick. Die “Dissident Biennale”, Venedig, 1977 Die „Biennale del Dissenso“ war 1977 der ambitionierte Versuch des damaligen Biennale-Vorsitzenden Carlo Ripa di Meana, das doppelgesichtige Profil der venezianischen Großausstellung radikal zu erneuern. Diese Veranstaltung war schon immer sowohl repräsentativ-mainstream als auch wegen des Wettkampfes der teilnehmenden Nationen politisch geprägt gewesen. Ripa di Meanas Vorhaben war es nun, diesen politischen Aspekt zu betonen, ihn allerdings anders und neu zu definieren. Unter seinem Vorsitz wurde die Politisierung zum Programm der sonst eher traditionell angelegten Biennale Venedig, zum Beispiel durch das Thema der lateinamerikanischen Diktaturen oder die Kunst des östlichen Europa in den 1970er Jahren. Zugleich wurde damit westlichen Erwartungen entsprochen und ein politisches Verständnis der osteuropäischen Kunst stark gemacht, dem zufolge nur die Kunst als wertvoll gelten könne, die sich jenseits des offiziellen Kulturbetriebs der Diktaturen positioniert. Dies ist bis heute die dominante, wenn auch längst nicht mehr frisch wirkende Perspektive, die es zu überdenken gilt, u. a. deshalb, weil eine derartige Schilderung der „oppositionellen“ Kunst für die westliche Öffentlichkeit mehr von den Selbstbestätigungsversuchen und Legitimationsbestrebungen der westlichen Linksparteien der 70er Jahre motiviert war und weniger mit einer treffenden Darstellung und Einschätzung der Kunstsituation in Osteuropa zu tun hatte.
description: Comparativ, Vol 24 No 4 (2014): Doing culture under state-socialism: Actors, events and interconnections
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium
Creators: name: Martinello, M.
name: Grassellino, A.
name: Checchin, M.
name: Romanenko, A.
name: Melnychuck, O.
name: Sergatskov, D. A.
name: Posen, S.
name: Zasadzinski, J. F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. The origin of this effect is attributed to the lowering of the Mattis and Bardeen surface resistance contribution with increasing accelerating field. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper we conduct the first systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobium resonators. Adding these results together we are able to show for the first time which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. These results also provide new insights on the physics behind the change in the field dependence of the Mattis and Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.
The “Rule of Law” in British India, or a Rule of Lawyers?
Creators: name: Steller, Verena
Publisher: name: Leipziger Universitätsverlag
Year: 2014

description: Wie alle Kolonialregime hat auch das britische Empire sein Recht und Gesetz bei der kolonialen Expansion mit sich geführt. Im kolonialen Kontext Britisch-Indiens wurde die englische „rule of law“ im letzten Drittel des 19. und zu Beginn des 20. Jahrhunderts zu einem äußerst umstrittenen Konzept. Basierend auf zeitgenössischen viktorianischen Diskussionen über die „rule of law“, ihre Ambivalenzen und Ansatzpunkte für Kritik rückt der Beitrag die erste Generation indischer Barrister, ihre berufliche Tätigkeit und ihr öffentliches Engagement in Hochverratsprozessen in den Mittelpunkt. In den „Großen Wahabiten-Prozessen“ 1864–1872 konfrontierten indische Anwälte die „rule of law“ mit ihren Paradoxa. Durch ihre Multipositionalität als offizielle Repräsentanten der britischen Krone und zugleich cultural brokers im transkulturellen Kontext stritten sie für politische Rechte und trugen zur Herausbildung von Konstitutionalismus bei.
description: Comparativ, Vol 24 No 5 (2014): The Dimensions of Transcultural Statehood
Disentangling Sub-GeV Dark Matter from the Diffuse Supernova Neutrino Background using Hyper-Kamiokande
Creators: name: Robles, Sandra
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The upcoming Hyper-Kamiokande (HyperK) experiment is expected to detect the Diffuse Supernova Neutrino Background (DSNB). This requires to ponder all possible sources of background. Sub-GeV dark matter (DM) which annihilates into neutrinos is a potential background that has not been considered so far. We simulate DSNB and DM signals, as well as backgrounds in the HyperK detector. We find that DM-induced neutrinos could indeed alter the extraction of the correct values of the parameters of interest for DSNB physics. Since the DSNB is an isotropic signal, and DM originates primarily from the Galactic centre, we show that this effect could be alleviated with an on-off analysis.
description: 7 pages, 2 figures, 1 table. Accepted for publication in SciPost Physics Proceedings: 14th International Conference on Identification of Dark Matter (IDM) 2022
Improved Treatment of Dark Matter Capture in Compact Stars
Creators: name: Robles, Sandra
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Compact stellar objects are promising cosmic laboratories to test the nature of dark matter (DM). DM captured by the strong gravitational field of these stellar remnants transfers kinetic energy to the star during the collision. This can have various effects such as anomalous heating of old compact stars. The proper calculation of the DM capture rate is key to derive bounds on DM interactions in any scenario involving DM accretion in a star. We improve former calculations, which rely on approximations, for both white dwarfs (WDs) and neutron stars (NSs). We account for the stellar structure, gravitational focusing, relativistic kinematics, Pauli blocking, realistic form factors, and strong interactions (NSs). Considering DM capture by scattering off either ions or degenerate electrons in WDs, we show that old WDs in DM-rich environments could probe the elusive sub-GeV mass regime for both DM-nucleon and DM-electron scattering. In NSs, DM can be captured via collisions with strongly interacting baryons or relativistic leptons. We project the NS sensitivity to DM-nucleon and DM-lepton scattering cross sections which greatly exceeds that of direct detection experiments, especially for low mass DM.
description: 9 pages, 2 figures. Submitted to SciPost Physics Proceedings: 14th International Conference on Identification of Dark Matter (IDM) 2022