cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
SAIBERSOC: Synthetic Attack Injection to Benchmark and Evaluate the Performance of Security Operation Centers
Creators: name: Rosso, Martin
name: Campobasso, Michele
name: Gankhuyag, Ganduulga
name: Allodi, Luca
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In this paper we introduce SAIBERSOC, a tool and methodology enabling security researchers and operators to evaluate the performance of deployed and operational Security Operation Centers (SOCs) (or any other security monitoring infrastructure). The methodology relies on the MITRE ATT&CK Framework to define a procedure to generate and automatically inject synthetic attacks in an operational SOC to evaluate any output metric of interest (e.g., detection accuracy, time-to-investigation, etc.). To evaluate the effectiveness of the proposed methodology, we devise an experiment with $n=124$ students playing the role of SOC analysts. The experiment relies on a real SOC infrastructure and assigns students to either a BADSOC or a GOODSOC experimental condition. Our results show that the proposed methodology is effective in identifying variations in SOC performance caused by (minimal) changes in SOC configuration. We release the SAIBERSOC tool implementation as free and open source software.
description: To be published in Annual Computer Security Applications Conference (ACSAC 2020), December 7-11, 2020, Austin, USA. ACM, New York, NY, USA, 13 pages. https://doi.org/10.1145/3427228.3427233, ISBN: 978-1-4503-8858-0/20/12 Artifact repository: https://gitlab.tue.nl/saibersoc/acsac2020-artifacts
Channel usage statistics and cellular digital packet data : channel selection strategies in cellular telephony systems
Creators: name: Jedrzycki, Christopher Mark
Publisher: name: University of British Columbia
Year: 2009

description: In order to prevent high rates of blocking, channel utilization in analog cellular mobile radio networks is significantly lower than 100%. The idle channels can be used to extend various information services to mobile users by overlaying a secondary packet-switched data service over the conventional circuit-switched voice service. This task is currently performed by the Cellular Digital Packet Data (CDPD) service. The throughput and utilization of the CDPD service depends to a large extent on the Advanced Mobile Phone System (AMPS) traffic statistics. These statistics have only been approximated and have never been verified with real data in current open literature. This thesis presents traffic data obtained from BC Tel Mobility, a cellular service provider, and describes the AMPS channel holding time and call inter arrival time distributions. The channel holding time is not best approximated by the negative exponential distribution as usually stated in literature. The lognormal distribution proves to be a much closer fit. Several spikes have to be added to this distribution to account for immediate handoff candidacy. The AMPS traffic statistics are then used to study the channel holding time of the CDPD service. The channel assignment strategy used for assigning channels to new calls in the AMPS and CDPD services is studied and a recommendation as to which is the optimal combination is made. The optimal channel assignment strategy results in the CDPD service being interrupted only when the new AMPS call finds no other idle channels in the cell site than the CDPD channel. The study considers factors which affect the CDPD channel holding times such as AMPS traffic levels, number of channels in the cell site and number of CDPD streams at the cell site. The study concludes with the effect of all these factors on the utilization of the CDPD service.
Unconventional pairing in bipolaronic theories
Creators: name: Hague, J. P.
name: Kornilovitch, P. E.
name: Alexandrov, A. S.
name: Samson, J. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Various mechanisms have been put forward for cuprate superconductivity, which fit largely into two camps: spin-fluctuation and electron-phonon (el-ph) mechanisms. However, in spite of a large effort, electron-phonon interactions are not fully understood away from clearly defined limits. To this end, we use a numerically exact algorithm to simulate the binding of bipolarons. We present the results of a continuous-time quantum Monte-Carlo (CTQMC) algorithm on a tight-binding lattice, for bipolarons with arbitrary interaction range in the presence of strong coulomb repulsion. The algorithm is sufficiently efficient that we can discuss properties of bipolarons with various pairing symmetries. We investigate the effective mass and binding energies of singlet and triplet real-space bipolarons for the first time, and discuss the extensions necessary to investigate $d$-symmetric pairs.
description: Submitted to M2S-HTSC VIII, Dresden 2006, 2 pages
title: Bowel perforation with peritonitis and pneumoperitoneum – an emergency presentation of acute intestinal ischaemia
Creators: name: Neupane, Nirmal Prasad
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Abdominal imaging
subject: Emergency
subject: Gastrointestinal tract
subject: CT
subject: CT-Angiography
subject: Complications
subject: Education
subject: Acute
subject: Ischaemia / Infarction
subject: Clinical Cases

description: Clinical History: A 38-year-old female was brought to the emergency department with the chief complaint of acute onset severe abdominal pain. The abdominal pain was not associated with vomiting or fever.  Her blood pressure at the time of presentation was 90/50 mm Hg and her pulse rate was 112/minute. Her past medical history revealed that she was a known case of rheumatic heart disease. She was admitted and was treated for bacterial endocarditis ten days back. No history of hypertension or diabetes was noted. No history of previous abdominal surgeries was noted.

description: 38 years, female
Smart Learning Platform 4.0 - Vermittlung von neuen Kompetenzen und Qualifikationsprofilen im Hinblick auf Industrie 4.0
Creators: name: Uckelmann, Dieter
name: Pfeiffer, Anke
name: Kutzner, Kevin
Publisher: name: aw&I Conference
Year: 2018

description: Obwohl heutige Studierende mit Computern und dem Internet groß werden, fehlt ihnen häufig der Bezug zu grundlegenden Technologien. Dieser wird allerdings von Nachwuchsingenieurinnen und -ingenieuren erwartet, um neue Impulse für Forschung und Praxis liefern zu können. Aufgrund der geänderten Anforderungen einer digitalisierten Arbeitswelt hat sich der Studiengang Informationslogistik, der Hochschule für Technik Stuttgart das Ziel gesetzt, den Studierenden eine realitätsnahe Industrieumgebung, in Form eines Industrie 4.0 Labors mit mobilen, stationären und virtuellen Bestandteilen einzurichten. Studierende erwerben in der hybriden Laborumgebung in praxisnahen Übungen ein fundiertes theoretisches und praktisches Wissen über das Zusammenspiel von Hardware, Software und Telekommunikation. Didaktisch flankiert wird der Kompetenzerwerb der Studierenden auf der Smart Learning Platform 4.0 (SLP), einer virtuellen Lernplattform, die als studienbegleitendes Element im Pflichtcurriculum des Studiengangs verankert werden soll. Um den Lernprozess der Studierenden durch unterschiedliche Feedbackformen zu verbessern, sowie um die laborbasierte Lernumgebung weiterzuentwickeln, wird auf der SLP aktuell der Einsatz von Learning Analytics erprobt. Langfristig ist geplant das vorgestellte Modell auf weitere Studiengänge zu übertragen, um die vorgestellten Lösungsansätze vollumfänglich auszuschöpfen und um einen optimalen Wissenstransfer zwischen Studium und Berufspraxis zu gewährleisten.
description: aw&I Conference, Bd. 3 (2018): innteract2018
title: Bladder neoplasm arising within a urinary bladder hernia: a rare cause of hematuria
Creators: name: Rodrigues, Carolina Terra
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Uroradiology & genital male imaging
subject: Genital / Reproductive system male
subject: CT
subject: Ultrasound
subject: Genital / Reproductive system male
subject: Cancer
subject: Hernia
subject: Clinical Cases

description: Clinical History: An 89-years-old man presented to the emergency department with left groin swelling with years of evolution, irreducible in the past two days. He also referred hematuria for two weeks. The physical examination revealed a large mass in the left groin with tenderness on palpation and the abdomen soft and depressible.

description: 89 years, male
Superstrings in Thermal Anti-de Sitter Space
Creators: name: Ashok, Sujay K.
name: Troost, Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the calculation of the thermal free energy for string theory in three-dimensional anti-de Sitter spacetime with Neveu-Schwarz-Neveu-Schwarz flux. The path integral calculation is exploited to confirm the off-shell Hilbert space and we find that the Casimir of the discrete representations of the isometry group takes values in a half-open interval. We extend the free energy calculation to the case of superstrings, calculate the boundary toroidal twisted partition function in the Ramond-Ramond sector, and prove lower bounds on the boundary conformal dimension from the bulk perspective. We classify Ramond-Ramond ground states and construct their second quantized partition function. The partition function exhibits intriguing modular properties.
description: 58 pages, 4 figures
Coupled spin-1/2 antiferromagnetic chain Cs$_2$LiRuCl$_6$ with partially disordered crystal lattice
Creators: name: Watanabe, Kazumitsu
name: Kurita, Nobuyuki
name: Tanaka, Hidekazu
name: Sugiyama, Haruki
name: Uekusa, Hidehiro
name: Diaz-Ortega, Ismael F.
name: Nojiri, Hiroyuki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We determined the crystal structure of Cs$_2$LiRuCl$_6$, which was synthesized first in this work, and investigated its magnetic properties. Cs$_2$LiRuCl$_6$ has a hexagonal structure composed of linear chains of face-sharing RuCl$_6$ and LiCl$_6$ octahedra. In two-thirds of the structural chains, Ru$^{3+}$ and Li$^+$ sites are almost ordered, while in the other chains their sites are disordered. This situation is analogous to the ground state of the antiferromagnetic Ising model on a triangular lattice. Using electron paramagnetic resonance, we evaluated the $g$ factors of Ru$^{3+}$ with effective spin-1/2 as $g_c\,{=}\,2.72$ and $g_{ab}\,{=}\,1.50$ for magnetic fields $H$ parallel and perpendicular to the $c$ axis, respectively. Magnetization curves for $H\,{\parallel}\,c$ and $H\,{\perp}\,c$ are highly anisotropic. However, these magnetization curves approximately coincide when normalized by the $g$ factors. It was found from the magnetization and specific heat results that Cs$_2$LiRuCl$_6$ can be described as a coupled one-dimensional $S\,{=}\,1/2$ Heisenberg-like antiferromagnet with $J/k_{\rm B}\,{\simeq}\,3.7$ K. Three-dimensional ordering occurs at $T_{\rm N}\,{=}\,0.48$ K. A magnetic phase diagram for $H\,{\parallel}\,c$ is also presented.
description: 9 pages, 12 figures
Real.L – Lehre vor Ort (ein Praxisbeispiel)
Creators: name: Korzer, Tanja
name: Scherzer-Heidenberger, Ronald
Publisher: name: aw&I Conference
Year: 2018

description: Das Projekt Real.L ist als inter- und intradisziplinäres Projekt (Reallabor) in Kooperation zwischen unterschiedlichen Fachbereichen an der Universität Leipzig und der HTWK Leipzig sowie verschiedenen Praxispartnern durchgeführt worden. Real.L setzte sich aus insgesamt 9 Teilprojekten an 5 Stadträumen/Standorten entlang der Leipziger Magistrale Georg-Schumann-Str. zusammen. Nach der Konzeptentwicklung erfolgte im Rahmen eines öffentlichen Aktionstages die Umsetzung der Projekte in Form verschiedener symbolischer Interventionen wie beispielsweise die Bespielung leerstehender Ladenlokale durch einen Popup Store in Kooperation mit den Unternehmen vor Ort, die Belebung von öffentlichen Plätzen durch ein Freilichtkino, eine Bouleaktion und Vorträge oder die Aktivierung der Nachbarschaften entlang der Magistrale durch Platzgestaltung und die Erstellung individueller thematischer Stadtkarten. Außerdem wurde das Prinzip eines offenen „Shopping-Centers“ als Konzept für die Geschäftslage diskutiert. Den Initialprojekten liegen wirtschaftlich tragfähige und langfristig umsetzbare Konzeptionen zugrunde.
description: aw&I Conference, Bd. 3 (2018): innteract2018
Dirichlet series of integers with missing digits
Creators: name: Nathanson, Melvyn B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11A63, 11B05, 11B75, 11K16

description: For certain sequences $A$ of positive integers with missing $g$-adic digits, the Dirichlet series $F_A(s) = \sum_{a\in A} a^{-s}$ has abscissa of convergence $σ_c < 1$. The number $σ_c$ is computed. This generalizes and strengthens a classical theorem of Kempner on the convergence of the sum of the reciprocals of a sequence of integers with missing decimal digits.
description: Minor improvements and corrected typos; 7 pages
Normal ordering and boundary conditions for fermionic string coordinates
Creators: name: Braga, Nelson R. F.
name: Carrion, Hector L.
name: Godinho, Cresus F. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We build up normal ordered products for fermionic open string coordinates consistent with boundary conditions. The results are obtained considering the presence of antisymmetric tensor fields. We find a discontinuity of the normal ordered products at string endpoints even in the absence of the background. We discuss how the energy momentum tensor also changes at the world-sheet boundary in such a way that the central charge keeps the standard value at string end points.
description: In this revised version we clarify the issue of consistency between supersymmetry and boundary conditions and stress the fact that we are considering flat space. we also add two more references
The buildup of the intracluster light of Abell 85 as seen by Subaru's Hyper Suprime-Cam
Creators: name: Montes, Mireia
name: Brough, Sarah
name: Owers, Matt S.
name: Santucci, Giulia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The study of low surface brightness light in large, deep imaging surveys is still uncharted territory as automated data reduction pipelines over-subtract or eliminate this light. Using archival data of the Abell 85 cluster of galaxies taken with Hyper Suprime-Cam on the Subaru Telescope, we show that using careful data processing can unveil the diffuse light within the cluster, the intracluster light. We reach surface brightness limits of $μ_{g}^{limit}$(3$σ$, 10"x10") = 30.9 mag/arcsec$^2$, and $μ_{i}^{limit}$(3$σ$, 10"x10") = 29.7 mag/arcsec$^2$. We measured the radial surface brightness profiles of the brightest cluster galaxy out to the intracluster light (radius $\sim215$ kpc), for the g and i bands. We found that both the surface brightness and the color profiles become shallower beyond $\sim75$ kpc suggesting that a distinct component, the intracluster light, starts to dominate at that radius. The color of the profile at $\sim100$ kpc suggests that the buildup of the intracluster light of Abell 85 occurs by the stripping of massive ($\sim10^{10}M_{\odot}$) satellites. The measured fraction of this light ranges from 8% to 30% in g, depending on the definition of intracluster light chosen.
description: Accepted for publication in ApJ. Figures 6 and 8 show the main results of the paper
title: A case of Facial colliculus syndrome
Creators: name: Lenin, Pradhap
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Neuroradiology
subject: Neuroradiology brain
subject: MR
subject: Neuroradiology brain
subject: Ischaemia / Infarction
subject: Clinical Cases

description: Clinical History: A 31-year-old male presented in the Emergency Department with acute-onset horizontal diplopia. Clinical examination revealed conjugate gaze palsy and lower motor neuron type of left facial nerve palsy. However, pupils were normal in size with normal direct light reflexes. No other neurological deficits were present.

description: 31 years, male
Workshop »Arbeit 4.0: Gesundheit erhalten – Arbeit gestalten«
Creators: name: Unger, Holger
Publisher: name: aw&I Conference
Year: 2018

description: „Arbeiten 4.0 ist ein Kürzel für die Veränderungen in der gesamten Arbeitswelt und
 ihre Folgen für die Gesellschaft.“ (BMAS, 2017)


Bei Diskussionen um die „Vierte industrielle Revolution“ stehen technikzentrierte Visionen, die Technologien und technischen Lösungen bis hin zu komplexen Prozessarchitekturen in cyber-physischen Systemen vielfach im Mittelpunkt. Problemstellungen zur Gestaltung guter Arbeitsbedingungen treten oftmals in den Hintergrund und werden häufig vernachlässigt.


Vor diesem Hintergrund sollte unser Workshop »Arbeit 4.0: Gesundheit erhalten – Arbeit gestalten« zum einen zur Sensibilisierung für eine gesundheitsfördernden Arbeitsgestaltung beitragen und zum anderen nach Ansätzen für eine ergonomische und rechtsichere Ausgestaltung von stationärer Telearbeit suchen und dabei Anregungen aus der Praxis aufgreifen.


Der erste Schwerpunkt lag auf der Arbeit mit dem Analyseinstrument INQA-Check „Gesundheit“ durch die Teilnehmer mit dem Fokus einer Weiterentwicklung des Instrumentariums für die Anforderungen einer „Arbeit 4.0“. Im Ergebnis liegen Erfahrungen und Anregungen für die Fortentwicklung des INQA-Check „Gesundheit“ und eine Checkliste als Ausgangspunkt für eine Gefährdungsbeurteilung einer stationären Telearbeit vor.


Im zweiten Teil des Workshops konnten die Teilnehmer zum Thema Work-Life-Balance mit Lego®-Steinen hantieren und das „Lego® Serious Play®“ (LSP) ausprobieren.
description: aw&I Conference, Bd. 3 (2018): innteract2018
title: Acute pancreatitis as a rare initial presentation of pancreatic adenocarcinoma
Creators: name: Patel, Sunny
name: Keshavamurthy, Jayanth
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Abdominal imaging
subject: Abdomen
subject: Pancreas
subject: CT
subject: Cancer
subject: Clinical Cases

description: Clinical History: An obese 56-year-old male presented to the hospital with obstructive jaundice and underwent further radiologic investigation. One year earlier, he presented to the ER and was admitted for dull epigastric abdominal pain with unremarkable physical exam and mildly elevated lipase. The patient is a non-smoker and non-drinker.

description: 56 years, male
An Overview of Massive Open Online Courses with Topics of Robotics
Creators: name: Ganbat, Danaa
name: Tudevdagva, Uranchimeg
Publisher: name: Embedded Selforganising Systems
Year: 2019

description: This article reports short overview of massive open online courses for “robotic” topic. Extensive use of mobile devices opens up various opportunities for educational institutions to transfer contents to learners. Modern learners prefer to manage their learning by personal way. Many online courses are confirming this fact. Nowadays we can find unlimited number of contents on the internet. Almost all universities offer own online courses with various topics. In the last decade massive open online course (MOOC) became one of the opportunities to keep educated. The robotics is main focus of this issue, therefore we are trying to conduct small study on online educational contents with this topic. We selected five MOOCs in our study. Main criteria of selection were personal experience of author with these MOOCs. An evaluation of MOOCs is not an aim of the article. Through this article we tried to make visible opportunities to get education on robotics free by online with your personal learning management time.
description: Embedded Selforganising Systems, Vol 5 No 2 (2018): Robotics in Human Environment: Challenges and Solutions
Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2
Creators: name: Prok, Y.
name: Bosted, P.
name: Burkert, V. D.
name: Deur, A.
name: Dharmawardane, K. V.
name: Dodge, G. E.
name: Griffioen, K. A.
name: Kuhn, S. E.
name: Minehart, R.
name: Collaboration, the CLAS
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The spin structure functions g_1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH_3 and ND_3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q^2 < 5 GeV^2 and W < 3 GeV. The first moments of g_1 for the proton and deuteron are presented -- both have a negative slope at low Q^2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first result for the generalized forward spin polarizability of the proton gamma_0^p is also reported. This quantity shows strong Q^2 dependence at low Q^2, while Q^6γ_0^p seems to flatten out at the highest Q^2 accessed by our experiment. Although the first moments of g_1 are consistent with Chiral Perturbation Theory (ChPT) calculations up to approximately Q^2 = 0.06 GeV^2, a significant discrepancy is observed between the γ_0^p data and ChPT for gamma_0^p, even at the lowest Q2.
description: Final version as published in PLB. Added a parametrization of world data at high Q^2 to Fig. 3
Step Dynamics and the Morphological Evolution of Nanostructures
Creators: name: Bunch, Andrew David
Publisher: name: Maryland Shared Open Access Repository
Year: 2008
Subjects: Mound Decay
Nanoneedle
Nanostructures
Nanowire
Rayleigh Instability
Surface Diffusion

description: Surface diffusion of atoms plays a significant role in the evolution of the shape of a material in the nanometer regime because it becomes the dominant mechanism for mass transport as the surface area to volume ratio increases.  In this dissertation, I present a theoretical study of the shape evolution of a particular nanostructure: the nanowire. At non-zero temperatures, atomic steps are always present on the surface of a nanostructure and their growth and motion causes a change of shape and can cause the wire to break.  I have studied the morphological evolution of nanowires before and after a break develops, the resulting segments of a broken nanowire whose tips are nanoneedles.  My approach is to develop and compare a step motion model and atomistic simulations and test them against available experimental data and classical continuum theory. My approach also allowed me to derive the scaling relations and exponents describing the morphological evolution of nanowires and study the microscopic nature of the instability that causes them to break.
title: Ileal carcinoid tumor
Creators: name: Lajusticia Andrés, Héctor
name: Unzue Garcia-Falces, Guillermo
name: López Sala, Paul
name: Alberdi Aldasoro, Nerea
name: De Llano Ibisate, Loreto Ana
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Abdominal imaging
subject: Abdomen
subject: Gastrointestinal tract
subject: CT
subject: MR
subject: Ultrasound
subject: Clinical Cases

description: Clinical History: A 74-year-old male comes to the hospital with symptoms of diarrhoea, tenesmus, faecal incontinence and weight loss of 3 kilograms. Biochemistry reveals liver function enzyme alteration. Ultrasound exam shows liver metastasis. Contrast-enhanced computed tomography (CECT) is performed to confirm the findings.

description: 74 years, male
The baryon vertex with magnetic flux
Creators: name: Janssen, Bert
name: Lozano, Yolanda
name: Rodriguez-Gomez, Diego
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this letter we generalise the baryon vertex configuration of AdS/CFT by adding a suitable instantonic magnetic field on its worldvolume, dissolving D-string charge. A careful analysis of the configuration shows that there is an upper bound on the number of dissolved strings. This should be a manifestation of the stringy exclusion principle. We provide a microscopical description of this configuration in terms of a dielectric effect for the dissolved strings.
description: 17 pages, 2 figures. V2: reference added. V3: version to appear in JHEP
Optical Pump Terahertz Probe Studies of Semiconducting Polymers
Creators: name: Cunningham, Paul D
Publisher: name: Maryland Shared Open Access Repository
Year: 2010
Subjects: conductivity
organic
photovoltaic
polythiophene
semiconductor
Terahertz

description: Optical-pump terahertz-probe spectroscopy (OPTP) has been applied to study charge generation, transport and the evolution of the photo-induced excited states in thin film organic semiconductors, with emphasis on their relevance to photovoltaic technology.  In these experiments the response of the photoexcited material to the AC electric field of a terahertz (THz) pulse was measured. From this response, the evolution of the complex conductivity in the far-infrared was monitored.  OPTP presents advantages over other techniques by being an all-optical probe of the complex conductivity over nanometer scale distances with sub-picosecond resolution and exhibits particular sensitivity to carrier scattering rates, which typically lay in the THz range.  Conductivity models were applied to the extracted conductivity curves in order to determine technologically relevant quantities like the charge carrier mobility and external quantum yield of charge carrier generation. We observed charge carriers generated on a subpicosecond time scale in thin films of polyhexylthiophene (P3HT).  Through application of the Drude-Smith model (DSM) over the 0-2 THz band, we determined a room temperature intrinsic mobility of about 30 cm2 The temperature dependence of the conductivity dynamics showed signs of thermally activated polaron hopping influenced by torsional disorder.  Both above and below gap excitation resulted in similar dynamics, showing that the majority of carriers recombine within 1 ps.  We were able to observe charge transfer occurring on a sub-ps timescale to the soluble fullerene, PCBM, for both excited states, demonstrating that narrow gap polymers can be blended with PCBM for photovoltaic applications. We observed charge carrier generated on a sub-ps time scale in thin amorphous films of metalated polymers.  The time evolution of the conductivity showed that charge carriers recombine and only excitons persist after 100 ps.  This characteristic appears to be common to amorphous systems.  An intrinsic mobility of 20 cm2 s found for the most promising material. Broadband (0-6 THz) studies of the photoconductivity in P3HT suggest that the hole mobility is lower than initially determined.  They also bring into question whether the DSM can describe the conductivity effectively or whether delocalized polaron transitions at higher frequencies are the origin of the observed features.
title: COVID-19 halo sign
Creators: name: Concejo Iglesias, Paula
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Chest imaging
subject: Lung
subject: CT
subject: Diagnostic procedure
subject: Infection
subject: Clinical Cases

description: Clinical History: A 25 year-old male resident presented with a 72 h history of fever up to 38 ºC, odynophagia, myalgia and general malaise. Laboratory studies only showed increased C-reactive protein (23 mg/L, normal range 0-5 mg/L). D-dimer was 0,23 μg / ml which is normal.

A chest X-ray was performed due to a suspicion of a COVID-19 infection. 

description: 25 years, male
Nonlinear Optical Properties of Novel Forms of Enriched Carbon Disulfide
Creators: name: Edziah, Raymond
Publisher: name: Maryland Shared Open Access Repository
Year: 2010
Subjects: carbon disulfide
enriched carbon disulfide
nonliear absorption coefficient
optical limiters
optical limiting
Z-scan

description: The ultimate goal of designing molecules with large third-order nonlinearities is to incorporate them into optical switching and limiting devices. To achieve this, the molecules must have large and fast optical nonlinearities. We undertook picosecond and femtosecond studies of carbon disulfide (CS2) enriched with sulfur, selenium, cadmium telluride nanoparticles and 2-methyl-4-nitroaniline (MNA) for enhanced optical nonlinearities, using the Z-scan technique. In this method, a sample is scanned along the optic axis (chosen as the z- direction) in the focal region of a single focused laser beam. The intensity transmitted through the region with an aperture (nonlinear refraction) or without an aperture (nonlinear absorption) in the far field is recorded as a function of the sample position. Due to the high intensity of the electromagnetic field in this region, the sample tends to behave as a lens of variable focal length and can focus or defocus the beam depending on the sign of the nonlinearity. Our measurements with a 130-fs source indicate that the nonlinear absorption coefficient of CS2 was enhanced by more than two orders of magnitude (over pure CS2) through sulfur and selenium enrichment; while their nonlinear refractive indices experienced minimal change. Enhanced nonlinearities of enriched CS2 molecules may be harnessed for sensor applications.
Elliptic Flow and Fixed p_T Suppression in a Final State Interaction Model
Creators: name: Capella, A.
name: Ferreiro, E. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It has been shown that a final state interaction model, used to describe J/psi suppression, can also describe the fixed p_T suppression of the pi^0 (and charged pions) yield at all values of p_T, with a final state interaction cross-section sigma close to one milibarn. We propose an extension of the model to the pion motion in the transverse plane - which introduces a dependence of the suppression on the azimuthal angle theta_R. Using the same value of sigma, we obtain values of the elliptic flow v_2 close to the experimental ones, for all values of p_T, including the soft p_T region.
description: 21 pages, 6 figures
Neural networks in Atmospheric Scattering Calculations
Creators: name: Rickert, Andrew
Publisher: name: Maryland Shared Open Access Repository
Year: 2009
Subjects: calculations
networks
Neural
scattering

description: For the majority of the particles in the atmosphere, calculations of scattering energy loss are increasingly accurate in proportion to the computing time afforded them. Accurate radiative transfer calculations, even with the most efficient numerical methods, are computationally expensive. This becomes a serious problem for multi-decadal climate simulations for which an accurate representation of the radiative impact of atmospheric constituents is crucial. This thesis presents one method for reducing the computational expense radiative transfer calculations of aerosol scattering properties, which are used in chemical models. The goal of this research is to develop a fast scattering code using a neural network that is trained on input and output data derived from an accurate T-Matrix scattering algorithm. The input space to the neural net consists of scattering parameters that describe the atmospheric scattering conditions such as wavelength of incoming light, effective particle radius, and index of refraction. The output space consists of the coefficients of a Legendre polynomial expansion of the phase function. The neural net finds the nonlinear mapping between the input and output spaces for a training set and can subsequently be used to generate the phase function for arbitrary wavelength, particle radius and index of refraction. In this research, a neural network applicable to both Lorenz and Mie scattering is developed and tested for both accuracy and speed.  The accuracy of the neural net is found to be excellent, with errors well below 10%, and runtime testing shows that the neural net is approximately 5 times faster than a lookup table.
Multivariate Retrieval of Carbon Monoxide
Creators: name: Wilson, Robert Christopher
Publisher: name: Maryland Shared Open Access Repository
Year: 2011
Subjects: AERI
AIRS
Carbon Monoxide
Data Fusion
Error Analysis
Retrieval

description: A new technique is presented here to retrieve carbon monoxide (CO) profiles from Atmospheric Emitted Radiance Interferometer (AERI) spectra. This retrieval version deviates from the previous AERI CO retrieval method, which utilized signal processing to determine a constant CO mixing ratio representative of the entire troposphere. Instead, this retrieval version utilizes linear mapping to ascertain an estimate of the CO profile. A detailed analysis is conducted to estimate the error from all aspects of the linear mapping procedure including measurements, forward modeling of atmospheric radiation, and uncertainty from inputs to the forward model. It was found that the dominant sources of error were from cloud contaminated spectra and uncertainty in absorption line strengths inside the forward model. A new cloud flagging technique that uses a neural network to identify spectra affected by clouds was tested and compared to the previously used version based on brightness temperature contrast. The neural network method decreased uncertainty between AERI and forward model spectra by 30 percent when compared with the previously used version.       First guess CO profiles to the AERI retrieval were from two different sources.  One source was an a priori rofile calculated as the mean profile from 57 individual measurements where each CO profile encompasses tower, aircraft, and a satellite CO measurement. The other first guess CO profile came from the AIRS version 5 (AIRSv5) retrieved CO product. Incorporating the AIRS CO profile to the AERI retrieval provided a better estimate of free tropospheric CO when compared with the a priori ile. Using a better upper tropospheric CO estimate resulted in more accurate results from the AERI retrieval below 2 km, thus revealing that an AERI plus AIRS retrieved CO product is superior to either instrument's own CO retrieval working alone. The combined retrieval product is shown to have an RMSE of 10% in the first 2 km of the atmosphere.
Analysis and evaluation of an adaptive silence deletion algorithm for compression of telephone speech
Creators: name: Loo, Clifford
Publisher: name: University of British Columbia
Year: 2009

description: This thesis is concerned with the analysis and evaluation of adaptive silence deletion as a means to compress telephone voice signals bandlimited to the range 200-3400 Hz. Speech is accompanied by noise arising from various environmental factors such as poor reception, interference of radio signals from mobile or cordless units, audible mechanical or social activities in the surroundings, and the conventional crosstalk and hum in the telephone system. A speech compression system based on significant modifications to an existing silence deletion algorithm has been implemented. Effects of the various system parameters on the operation of the system, as applied to telephone speech samples, are studied and analyzed graphically. Quality of the speech compression is assessed with subjective listening tests. With minimal algorithmic complexity and delay, the application of silence coding together with 4-bit ADPCM speech coding can compress uncoded telephone speech from an original bit rate of 128 kbps down to 16 kbps. Analysis of system performance shows that a processing frame size of 8 to 16 milliseconds yields the best combination of speech quality and compression efficiency. A set of system parameters is found to give robust performance in a wide range of operating environments, with different or varying speech and noise levels. Good playback quality resulting from compressed speech recorded in quiet and also in noisy environments is achieved at 50 percent compression, equivalent to half the bit rate of ADPCM.
title: Pulmonary embolism in patient with COVID-19 infection
Creators: name: Maestro Durán, María Alejandra
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Chest imaging
subject: Lung
subject: Conventional radiography
subject: CT
subject: Lung
subject: Infection
subject: Clinical Cases

description: Clinical History: A 74-year-old woman with an episode of 3 days of shortness of breath, asthenia and low-grade fever.  She was tested for COVID in the second day with negative result. Chest X-rays and a CT-pulmonary angiogram were performed during her hospital admittance.

description: 47 years, female
title: Travelling through the gut – small bowel occlusion caused by fistulisation of gossypiboma
Creators: name: Martins, Rute
Publisher: name: EURORAD
Year: 2020
Subjects: subject: Abdominal imaging
subject: Abdomen
subject: CT
subject: Fistula
subject: Foreign bodies
subject: Obstruction / Occlusion
subject: Clinical Cases

description: Clinical History: An 86-year-old male patient presented to the emergency department with acute abdominal pain and distension, associated with vomiting and decreased bowel movements. Previous history was significant for intra-abdominal foreign body compatible with a gossypiboma in follow-up CTs after left hemicolectomy for adenocarcinoma in 2007.

description: 86 years, male
Beta Amyloid-Neuron Interactions Explored via Computational Modeling
Creators: name: Gates, Brad
Publisher: name: Maryland Shared Open Access Repository
Year: 2008
Subjects: Engineering, Chemical (0542)

description: There has been considerable research into the mechanism by which beta amyloid (A?), one of the primary constituents in Alzheimer's disease, causes death in neurons. Many mechanisms have been proposed, and there is no consensus as to their validity. In order to aid in the comparison of various mechanisms, a computational model of a neuron was created. Research has shown that A? is capable of reducing the cell membrane's dielectric barrier by thinning the membrane. This reduction causes an increase in both membrane conductance and capacitance. This mechanism showed strong correlation to experimental data at low concentrations of A?. However, in the presence of A? in concentrations larger than 1.5?M, it was unable to produce results which agree with experimental data. If A? increases the conductance of a membrane, then it is likely through a different mechanism at higher concentrations. There has also been research into A? creating an ion channel inside the cell membrane, but no model of this channel yet exists. Using kinetic and equilibrium data from literature, a prototype model was created and implemented in the neuron. Although the results do not precisely match literature data, the prototype shows strong correlation with all of the trends expected when A? interacts with neurons. This shows that the A? channel has a distinct possibility of being a prime part of A?-neuron interactions and requires more research. This neuronal model has provided insight into two different mechanisms and can be used in the same manner for many others.
Multi-Scale Analysis of Observations of Tropical Cyclones with Applications to High-Resolution Hurricane Modeling
Creators: name: Trahan, Samuel G.
Publisher: name: Maryland Shared Open Access Repository
Year: 2011
Subjects: hurricanes
HWRF
model diagnostics
numerical modeling
tropical cyclones
tubulence

description: Tropical cyclone numerical models, a critical tool to forecasters, have been run at resolutions of around 9-30 km in operational centers until recently.  It is currently possible to run in the range of 1-4 km resolution, which may allow a model to resolve small-scale dynamical processes critical to tropical cyclone intensity.  A 3km version of the NCEP HWRF model is developed for that purpose and its competitive track and intensity forecasting abilities are demonstrated. To determine if the small scales are resolved correctly, a statistical framework for comparison to observations of small-scales is developed. The standard definition of a model's forecast intensity is examined, and found to have a systematic, resolution-dependent bias.  A database of TRMM overpasses of over eight hundred tropical cyclones is produced and used to show a relationship between storm-scale cloud top temperature and storm wind intensity.  However, all storms, regardless of strength, produce near-tropopause cloud tops, and storms undergoing rapid intensification (RI) tend to have higher cloud tops than non-RI storms.  In an analysis of in-situ wind data, vertical wind is shown to be scale-invariant, with no correlation beyond, nominally, 2 km scales. This new framework for comparison is used to show that model's cloud tops have the right relationships with intensity and intensification, but that downdrafts are weak and rare.  Model ""spin-up"" issues are seen: in the first six hours, some storms rapidly gain fine-scale 3 km resolution wind maxima that hurt the forecast and others weaken uniformly at all resolutions.  In addition, a model bug is found in this and operational HWRF: all microphysics type fractions are discarded when the nest moves. Overall, the research presented in this demonstrates the value of statistical diagnostics for high-resolution models.  In addition, this research presents a framework for a deeper investigation of tropical cyclone small-scale dynamics.
Deuterated Polycyclic Aromatic Hydrocarbons in the Interstellar Medium: The C--D Band Strengths of Mono-Deuterated Species
Creators: name: Yang, X. J.
name: Li, Aigen
name: Glaser, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Deuterium (D) is one of the light elements created in the big bang. As the Galaxy evolves, the D/H abundance in the interstellar medium (ISM) decreases from its primordial value due to "astration". However, the observed gas-phase D/H abundances of some interstellar sightlines are substantially lower than the expected reduction by astration alone. The missing D could have been depleted onto polycyclic aromatic hydrocarbon (PAH) molecules which are ubiquitous and abundant in interstellar regions. To quantitatively explore the hypothesis of PAHs as a possible reservoir of interstellar D, we compute quantum-chemically the infrared vibrational spectra of mono-deuterated PAHs (and their cations) of various sizes. We find that, as expected, when H in PAHs is replaced by D, the C-H stretching and bending modes at 3.3, 8.6 and 11.3 $μ$m respectively shift to longer wavelengths at $\sim$4.4, 11.4 and 15.4 $μ$m by a factor of $\sim$$\sqrt{13/7}$, the difference in reduced mass between the C-H and C-D oscillators. We derive from the computed spectra the mean intrinsic strengths of the 3.3 $μ$m C-H stretch and 4.4 $μ$m C--D stretch to be $\langle A_{3.3} \rangle \sim 13.4$ km/mol and $\langle A_{4.4} \rangle \sim 7.4$ km/mol for neutral deuterated PAHs which would dominate the interstellar 3.3 and 4.4 $μ$m emission. By comparing the computationally-derived mean ratio of $\langle A_{4.4}/A_{3.3} \rangle \sim 0.56$ for neutral PAHs with the mean ratio of the observed intensities of $\langle (I_{4.4}/I_{3.3})_{\rm obs} \rangle \sim 0.019$, we estimate the degree of deuteration (i.e., the fraction of peripheral atoms attached to C in the form of D) to be ~2.4\%, corresponding to a D-enrichment of a factor of ~1200 with respect to the interstellar D/H abundance.
description: 29 pages, 13 figures, 5 tables; accepted for publication in The Astrophysical Journal Supplement Series
Gibt es ein Lachen der Schadenfreude?
Creators: name: Hofmann, Jennifer
name: Ruch, Willibald
Publisher: name: Zeitschrift für Semiotik
Year: 2018

description: Summary. At the beginning of the 20th century, authors concerned with Ausdruckspsychologie (“expression psychology”) described the existence of a specific visual and auditory morphological pattern of schadenfreude laughter. They were putting enormous efforts in visual and verbal illustrations of several laughter types, but those ideas have been widely neglected in modern research. Preceding studies on the frequency and intensity of smiling and laughter in 16 positive emotions showed that not only amusement, but also schadenfreude elicited laughter and more intense facial displays of smiling and laughter. Thus, the current study investigated three hypotheses on the facial expression of schadenfreude in 17 recalled schadenfreude events. The results showed that schadenfreude went along with laughter very often (laughter occurred in over 70 % of the recalled schadenfreude memories). The facial expressions of smiling and laughter in schadenfreude were frequently accompanied by markers of display regulation and dampening. Therefore, the joyful expression of schadenfreude in the face (Duchenne display) is often distorted by regulation or dampening actions. This is probably due to the social desirability of not laughing at others’ misfortunes.


Zusammenfassung. Bereits zu Beginn des 20. Jahrhunderts beschrieben die Ausdruckspsychologen sowohl einen spezifischen Gesichtsausdruck als auch eine besondere Lautbildung, die nur dem Lachen der Schadenfreude zu eigen sein sollte. Leider wurden diese Ideen bislang nur unzureichend durch gezielte Untersuchungen weiterverfolgt. Vorarbeiten zur vorliegenden Studie, in denen die Häufigkeit und Intensität von Lächeln und Lachen in 16 positiven Emotionen untersucht wurden, zeigten, dass nicht nur Erheiterung systematisch mit Lachen und intensiveren mimischen Reaktionen einhergeht, sondern auch Schadenfreude. Aufbauend auf diesen Ergebnissen testete die vorliegende Studie drei Hypothesen zum mimischen Ausdruck von Schadenfreude in 17 erinnerten Schadenfreude-Erlebnissen. Die Resultate zeigen, dass Schadenfreude sehr oft mit Lachen einherging (in 70 % der Schadenfreude-Erlebnisse) und darüber hinaus die mimischen Ausdrücke oft durch Marker der Regulierung/Dämpfung des Ausdruckes gekennzeichnet waren. Während Schadenfreude also durch den für Freude typischen Gesichtsausdruck gezeigt wird (Duchenne-Display), findet im sozialen Kontext oft eine sichtbare Abschwächung (Regulation) oder ein Verbergen des Ausdrucks statt. Dies ist womöglich darauf zurückzuführen, dass es sozial nicht akzeptabel ist, über den Schaden anderer öffentlich zu lachen.
description: Zeitschrift für Semiotik, Vol 37 No 1-2 (2015): Lachen als Zeichenprozess
Werkner, Ines-Jacqueline und Schües, Christina (Hrsg.): Gerechter Frieden als Orientierungswissen ...
Creators: name: Raiser, Konrad
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 67 Nr. 3 (2018): Ökumenische Rundschau, Band 67, Heft 3
Waiting Times and Noise in Single Particle Transport
Creators: name: Brandes, Tobias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The waiting time distribution $w(τ)$, i.e. the probability for a delay $τ$ between two subsequent transition (`jumps') of particles, is a statistical tool in (quantum) transport. Using generalized Master equations for systems coupled to external particle reservoirs, one can establish relations between $w(τ)$ and other statistical transport quantities such as the noise spectrum and the Full Counting Statistics. It turns out that $w(τ)$ usually contains additional information on system parameters and properties such as quantum coherence, the number of internal states, or the entropy of the current channels that participate in transport.