cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Defect-free Perpendicular Diblock Copolymer Films: The Synergistic Effect of Surface Topography and Chemistry
Creators: name: Man, Xingkun
name: Zhou, Pan
name: Tang, Jiuzhou
name: Yan, Dadong
name: Andelman, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We propose a direct self-assembly mechanism towards obtaining defect-free perpendicular lamellar phases of diblock copolymer (BCP) thin films. In our numerical study, a thin BCP film having a flat top surface is casted on a uni-directional corrugated solid substrate. The substrate is treated chemically and has a weak preference toward one of the two BCP components. Employing self-consistent field theory (SCFT), we find that there is an enhanced synergy between two substrate characteristics: its topography (geometrical roughness) combined with a weak surface preference. This synergy produces the desired perpendicular lamellar phase with perfect inplane ordering. Defect-free BCP lamellar phases are reproducible for several random initial states, and are obtained for a range of substrate roughness and chemical characteristics, even for a uni-directional multi-mode substrate roughness. Our theoretical study suggests possible experiments that will explore the interplay between uni-directional substrate corrugation and chemical surface treatment. It may lead to viable and economical ways of obtaining BCP films with defect-free lateral alignment.
description: 8 pages, 9 figures
INVISIBLE LIGHT: SPECTRO-POLARIMETRIC CONTROL AND DETECTION OF THERMAL RADIATION
Creators: name: Wang, Xueji
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Nanophotonics
Photonics, optoelectronics and optical communications

description: Thermal radiation, an omnipresent phenomenon characterized by electromagnetic wave emission from objects above absolute zero, has consistently intrigued scientific exploration throughout history and profoundly influences various technological applications. Traditionally, the primary utilization of thermal radiation has been limited to fields such as lighting, cooling, and energy harvesting. However, the true potential of thermal radiation extends far beyond these energy-oriented applications. Every object imprints a unique signature within its emitted thermal radiation. These signatures, distinguished by their wide-ranging spectral and polarimetric characteristics, represent a rich information source about the emitting objects. The goal of this dissertation is to offer novel prospective and platforms to expand our perception and utilization of the spectral and polarimetric attributes of thermal radiation. It seeks to augment the conventional understanding of thermal radiation as merely an energy source, underlining its immense potential as an information carrier. This dissertation explores the spectral and polarimetric features left within the thermal radiation and how these features can be manipulated. The research uncovers that the macroscopic spectral, spatial, and particularly spin properties of thermal radiation are intimately connected to the underlying symmetry of the microscopic emitters within a nanophotonic system. This close relationship between symmetry and thermal radiation introduces a universal strategy to gain thorough control over the spectral-polarimetric properties of thermal radiation. The control of these properties may spur pioneering developments in encoding information within thermal radiation. Furthermore, platforms to decode these spectral and polarimetric properties in thermal radiation are as pivotal as the encoding platforms. These decoding platforms allow us to uncover hidden messages within this invisible light and enable us to push the boundaries of fully passive and physics-aware machine perception. Nevertheless, contemporary methods for spectrum and polarization resolved detection of thermal radiation, especially in imaging form, are cumbersome, lacking robustness, and prohibitively expensive. Hence, this dissertation explores two fundamentally innovative spectral separation schemes: the nonlocal super-dispersion enabled by optically active crystals and the dispersive dichroism in 2D infrared metasurfaces. These methods present compact, cost-effective, and high-performance solutions for spectral-polarimetric thermal imaging, thereby enhancing its efficacy in diverse applications.
Diagnosing Rare Diseases by Movement Primitive-Based Classification of Kinematic Gait Data
Creators: name: Xu, Jing
name: Greß, Hannah
name: Seefried, Sabine
name: Van Drongelen, Stefan
name: Schween, Raphael
name: Sommer, Claudia
name: Endres, Dominik
name: Krüger, Björn
name: Stief, Felix
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Motor control, movement and navigation

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
Sonnenfleckenzeichnung Nr. 25838.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 15.02.1980, erstellt von Hans Ulrich Keller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f sowie Gr (Anzahl g)
Theta Sequences in a 2D Space: An Integrated Model of Extrinsic and Intrinsic Encoding in the Hippocampus
Creators: name: Yiu, Yuk Hoi
name: Leibold, Christian
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Motor control, movement and navigation

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
Quasinormal modes of BTZ black hole and Hawking-like radiation in graphene
Creators: name: Kandemir, B. S.
name: Ertem, Ümit
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The Bañados-Teitelboim-Zanelli (BTZ) black hole model corresponds to a solution of (2+1)-dimensional Einstein gravity with negative cosmological constant, and by a conformal rescaling its metric can be mapped onto the hyperbolic pseudosphere surface (Beltrami trumpet) with negative curvature. Beltrami trumpet shaped graphene sheets have been predicted to emit Hawking radiation that is experimentally detectable by a scanning tunnelling microscope. Here, for the first time we present an analytical algorithm that allows variational solutions to the Dirac Hamiltonian of graphene pseudoparticles in BTZ black hole gravitational field by using an approach based on the formalism of pseudo-Hermitian Hamiltonians within a discrete-basis-set method. We show that our model not only reproduces the exact results for the real part of quasinormal mode frequencies of (2+1)-dimensional spinless BTZ black hole, but also provides analytical results for the real part of quasinormal modes of spinning BTZ black hole, and also offers some predictions for the observable effects with a view to gravity-like phenomena in a curved graphene sheet.
description: 5 pages,1 figure
Sonnenfleckenzeichnung Nr. 25908.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 19.05.1980, erstellt von Hans Ulrich Keller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f sowie Gr (Anzahl g)
title: The role of digital infrastructures in performances of organizational agility
Creators: name: Allwein, Florian
Publisher: name: London School of Economics and Political Science (LSE)
Year: 2017
Subjects: subject: H Social Sciences
subject: HD Industries. Land use. Labor
subject: HD28 Management. Industrial Management

description: Organizational agility has received much attention from practitioners and researchers in Information Systems. Existing research on agility, however, often conceptualizes information systems in a traditional way, while not reflecting sufficiently on how, as a consequence of digitalization, they are turning into open systems defined by characteristics like modularity and generativity. The concept of digital infrastructures captures this shift and stresses the evolving, socio-technical nature of such systems. This thesis sees IT in large companies as digital infrastructures and organizational agility as a performance within them. In order to explain how such infrastructures can support performances of agility, a focus on the interactions between IT, information and the people using and designing them is proposed. A case study was conducted within Telco, a large telecommunications firm in the United Kingdom. It presents three projects employees regarded as agile. A critical realist ontology is applied in order to identify generative mechanisms for agility. The thesis develops a theory of agility as a performance within digital infrastructures. This contains the central generative mechanism of agilization – making an organization more agile by cultivating digital infrastructures and minding flows of information to attain an appropriate level of agility. This is supported by the related mechanisms of informatization and infrastructuralization. Moreover, the concept of bounded agility illustrates how people in large organizations do not strive for agility unreservedly, instead aiming for agility in well-defined areas that does not put the business at risk. This theory of agility and the concept of bounded agility constitute the main theoretical contributions of this thesis. It also contributes clear definitions of the terms ‘information’ and ‘data’ and aligns them to the ontology of critical realism. Finally, the proposed mechanisms contribute to an emerging middle range theory of organizational agility that will be useful for practitioners.
Diffractive focusing of a uniform Bose-Einstein condensate
Creators: name: Boegel, Patrick
name: Meister, Matthias
name: Siemß, Jan-Niclas
name: Gaaloul, Naceur
name: Efremov, Maxim A.
name: Schleich, Wolfgang P.
Publisher: name: Bristol : IOP Publ.
Year: 2021
Subjects: subject: Bose-Einstein condensate
subject: diffractive focusing
subject: non-linear matter waves
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We propose a straightforward implementation of the phenomenon of diffractive focusing with uniform atomic Bose-Einstein condensates. Both, analytical as well as numerical methods not only illustrate the influence of the atom-atom interaction on the focusing factor and the focus time, but also allow us to derive the optimal conditions for observing focusing of this type in the case of interacting matter waves.
Η παρουσία της τέχνης και η σχέση της με τα λογοτεχνικά κείμενα στα εγχειρίδια λογοτεχνίας της μέσης εκπαίδευσης στην Ελλάδα
Creators: name: Μπίκα, Στυλιανή Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Οπτικός γραμματισμός-κριτική σκέψη
Τέχνη λογοτεχνία
Εκπαίδευση
Visual literacy-critical thinking
Art
Literature
Education

description: Η κυριαρχία της εικόνας σε όλους σχεδόν τους τομείς της ζωής μας, αποτελεί γεγονός αδιαμφισβήτητο και θεωρείται δεδομένο ότι ο σύγχρονος άνθρωπος είναι και πρέπει να είναι σε θέση να ερμηνεύει και να αποκωδικοποιεί καθετί που ερεθίζει την οπτική του. Το σχολείο αποτελεί καθοριστικό παράγοντα της καλλιέργειας του οπτικού γραμματισμού ο οποίος με τη σειρά του διευκολύνει την επικοινωνία μέσω των εικόνων. Η παρατήρηση των έργων τέχνης, αρχίζοντας από αυτά που υπάρχουν στα σχολικά εγχειρίδια, δημιουργεί για τους μαθητές ένα περιβάλλον διδασκαλίας αρκετά ευχάριστο και ελκυστικό που συμβάλλει στην οπτική εξοικείωση τους με σχήματα, φόρμες, χρώματα και μορφές. Παράλληλα οι μαθητές διαπραγματεύονται απλές ή σύνθετες έννοιες, καλλιεργούνται γλωσσικά και ασκούνται σε συλλογιστικές ολιστικού χαρακτήρα ενώ αποκωδικοποιούν τον πολιτισμό με εργαλείο την Τέχνη. Οι αισθήσεις κινητοποιούνται, το ενδιαφέρον αυξάνεται, η Τέχνη εντάσσεται στην εκπαιδευτική καθημερινότητα αλλάζοντάς την και η κατάκτηση της οπτικής γλώσσας διευκολύνει την επικοινωνία και την έκφραση. Στην παρούσα διδακτορική διατριβή επιχειρείται η διερεύνηση της σχέσης που υπάρχει ανάμεσα στα έργα τέχνης και τα λογοτεχνικά κείμενα των σχολικών εγχειριδίων της Μέσης Εκπαίδευσης στην Ελλάδα και πώς μπορεί η σχέση αυτή να οδηγήσει στην χρήση καλών πρακτικών ώστε ο οπτικός γραμματισμός στο πλαίσιο των σύγχρονων κοινωνικών επιταγών να οδηγήσει στην ανάπτυξη της δημιουργικής σκέψης των νέων ανθρώπων.
description: The dominance of the image in almost all areas of our lives is an indisputable fact and it is taken for granted that modern man is and must be able to interpret and decode everything that irritates his perspective. School is a key factor in cultivating visual literacy which in turn facilitates visual communication. Observing works of art, using those found in school textbooks, creates for students a teaching environment that is pleasant and attractive which contributes to their visual familiarization with shapes, figures, colors and forms. At the same time, students negotiate simple or complex concepts, cultivate them linguistically and practice holistic reasoning while decoding culture with art as a tool. By introducing Art to the educational daily reality, the students’ senses are being sharpened while their interest increases and their familiarization with visual language facilitates communication and delivery. This doctoral dissertation attempts to investigate the relationship that exists between the works of art and the literary texts of secondary school textbooks in Greece and the way this relationship can lead to the use of good practices in order for visual literacy to lead to the development of creative thinking for the youth.
Three replicable models of internationalized curricula
Creators: name: WP2 Task Force
Publisher: name: Zenodo
Year: 2023
Subjects: operational strategy of internationalization
Diploma supplement
Models of internationalized curricula

description: This document outlines the operational strategy of internationalization within UNITA. On one hand,
 a set of international learning activities is proposed to the students of the alliance, supporting the
 personalization of their study paths. This is promoted thanks to the use of the UNITA Diploma
 Supplement. On the other hand, a strategy to massively increase the institutional
 internationalization of curricula is initiated: matching events are organized, bringing together
 directors of department or faculties, and vice-rectors in Education. In parallel to the workshop
 sessions, models of internationalized curricula are presented. The description of the actions in the
 continuity of the current efforts conclude the report with some perspectives.
description: UNITA Grant number 101004082
Transformation of free form text to structured text
Creators: name: Kao, Spenser H.
Publisher: name: Monash University
Year: 2022

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.
Attoclock with bicircular laser fields as a probe of velocity-dependent tunnel-exit positions
Creators: name: Brennecke, Simon
name: Eckart, Sebastian
name: Lein, Manfred
Publisher: name: Bristol : IOP Publ.
Year: 2021
Subjects: subject: strong-field ionization
subject: tailored laser fields
subject: time-dependent Schrödinger equation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Strong-field ionization of atoms can be investigated on the attosecond time scale by using the attoclock method, i.e. by observing the peak of the photoelectron momentum distribution (PMD) after applying a laser pulse with a two-dimensional polarization form. Examples for such laser fields are close-to-circular or bicircular fields. Here, we report numerical solutions of the time-dependent Schrödinger equation for bicircular fields and a comparison with a compact classical model to demonstrate that the tunnel-exit position, i.e. the position where the electron emerges after tunnel ionization, is encoded in the PMD. We find that the tunnel-exit position depends on the transverse velocity of the tunneling electron. This gives rise to a momentum-dependent attoclock shift, meaning that the momentum shift due to the Coulomb force on the outgoing electron depends on which slice of the momentum distribution is analysed. Our finding is supported by a momentum-space-based implementation of the classical backpropagation method.
Radiation hardness test of un-doped CsI crystals and Silicon Photomultipliers for the Mu2e calorimeter
Creators: name: Baccaro, Stefania
name: Cemmi, Alessia
name: Cordelli, Marco
name: Diociaiuti, Eleonora
name: Donghia, Raffaella
name: Giovannella, Simona
name: Loreti, Stefano
name: Miscetti, Stefano
name: Pillon, Mario
name: Sarra, Ivano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Mu2e calorimeter is composed by 1400 un-doped CsI crystals coupled to large area UV extended Silicon Photomultipliers arranged in two annular disks. This calorimeter has to provide precise information on energy, timing and position. It should also be fast enough to handle the high rate background and it must operate and survive in a high radiation environment. Simulation studies estimated that, in the hottest regions, each crystal will absorb a dose of 300 Gy and will be exposed to a neutron fluency of 6 x 10^{11} n/cm^2 in 3 years of running. Test of un-doped CsI crystals irradiated up to 900 Gy and to a neutron fluency up to 9 x 10^{11} n/cm^2 have been performed at CALLIOPE and FNG ENEA facilities in Italy. We present our study on the variation of light yield (LY) and longitudinal response uniformity (LRU) of these crystals after irradiation. The ionization dose does not modify LRU while a 20% reduction in LY is observed at 900 Gy. Similarly, the neutron flux causes an acceptable LY deterioration (<15%). A neutron irradiation test on different types of SIPMs (two different array models from Hamamatsu and one from FBK) have also been carried out by measuring the variation of the leakage current and the charge response to an ultraviolet led. We concluded that, in the experiment, we will need to cool down the SIPMs to 0 C reduce the leakage current to an acceptable level.
description: Presented at CALOR 2016, 15-20 May. Submitted to Journal of Physics: Conference Series (JPCS)
The fallacy of evidence based policy
Creators: name: Saltelli, Andrea
name: Giampietro, Mario
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Economics (econ.GN)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences
subject: I.6.0

description: The use of science for policy is at the core of a perfect storm generated by the insurgence of several concurrent crises: of science, of trust, of sustainability. The modern positivistic model of science for policy, known as evidence based policy, is based on dramatic simplifications and compressions of available perceptions of the state of affairs and possible explanations (hypocognition). This model can result in flawed prescriptions. The flaws become more evident when dealing with complex issues characterized by concomitant uncertainties in the normative, descriptive and ethical domains. In this situation evidence-based policy may concur to the fragility of the social system. Science plays an important role in reducing the feeling of vulnerability of humans by projecting a promise of protection against uncertainties. In many applications quantitative science is used to remove uncertainty by transforming it into probability, so that mathematical modelling can play the ritual role of haruspices. This epistemic governance arrangement is today in crisis. The primacy of science to adjudicate political issues must pass through an assessment of the level of maturity and effectiveness of the various disciplines deployed. The solution implies abandoning dreams of prediction, control and optimization obtained by relying on a limited set of simplified narratives to define the problem and moving instead to an open exploration of a broader set of plausible and relevant stories. Evidence based policy has to be replaced by robust policy, where robustness is tested with respect to feasibility (compatibility with processes outside human control); viability (compatibility with processes under human control, in relation to both the economic and technical dimensions), and desirability domain (compatibility with a plurality of normative considerations relevant to a plurality of actors).
Dopamine-dependent cerebellar dysfunction enhances beta oscillations and disrupts motor learning in a multiarea model
Creators: name: Gambosi, Benedetta
name: Sheiban, Francesco J.
name: Biasizzo, Marco
name: Antonietti, Alberto
name: D'Angelo, Egidio
name: Mazzoni, Alberto
name: Pedrocchi, Alessandra
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Brain disease, network dysfunction and intervention

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
New Institutions, New Gender Rules? A Feminist Institutionalist Lens on Women and Power-Sharing
Creators: name: Mackay, Fiona
name: Murtagh, Cera
Publisher: name: feminists@law
Year: 2019

description: This article examines the apparent tension between power-sharing as the dominant approach to conflict settlement and the inclusion of women and provisions for gender equality as promoted through the Women, Peace and Security agenda. We argue that applying a feminist institutionalist (FI) lens - which attends to the interactions between political and social institutions, and the interplay between formal and informal rules, norms and practices - provides a means of explaining the so-called ‘gendered paradox of power-sharing’, including the gap between the promise of formal frameworks and outcomes for women in practice. We draw upon extant feminist research on three post-conflict power-sharing cases: Bosnia and Herzegovina, Northern Ireland, and Burundi. Using the concepts of: nested newness, formal and informal institutions, the gendered logic of appropriateness, and gendered actors, we illuminate why it has been so difficult for the gender progressive institutional innovations to be instantiated. In so doing, we answer the call of Byrne and McCulloch (2012) for more systematic analysis and theorising around the gendered paradox of power-sharing, and we also provide a basis for identifying what institutional mechanisms might be needed to embed the inclusion of women and the integration of the WPS norms in power-sharing frameworks in the future.
description: feminists@law, Vol 9 No 1 (2019)
Early age movement in offshore structures with various bearing conditions
Creators: name: Henneberg, Joshua
name: Schaumann, Peter
Publisher: name: Bristol : IOP Publ.
Year: 2021
Subjects: subject: Concrete construction
subject: Curing
subject: Ground supports
subject: Grouting
subject: Mortar
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Grouted connections (GCs) consist of two infiltrating steel tubes of different diameters and a grout material bonding the two steel tubes together. Predominantly, the GCs are used to connect the foundation piles with the jacket support structure. Additionally, it can be applied for monopile substructures. A challenging and scientifically still marginally analysed detail of grouted connections is the influence of early age movement (EAM), also known as early age cycling (EAC) on the final load bearing behaviour of the connection. After grouting and until the end of the curing of the material, the offshore structure is partially supported by fluid grout material for several hours. During this time waves and current affect the soft connections. This leads to relative movement during the curing of GCs, which is known as EAM. Previous investigations showed grout material damage due to vertical EAM. These results form the basis of the current offshore guideline limits. According to DNVGL-OS-J101 from 2014, it must be ensured that during the curing process the vertical EAM does not exceed 1 mm. Since 2016 the limit value also applies for the lateral EAM according to DNVGL. However, the influence of lateral EAM on the load bearing behaviour is barely experimentally nor numerically investigated. Thus, the authors are involved in a comprehensive research project (GREAM) addressing this topic. This paper focusses on Finite Element Analysis of different support structures under varying boundary conditions and sea states to analyse the amplitude of lateral EAM of grouted connections.
An implementation of sigma-delta analog-to-digital converters with application to ultrasonic beamforming
Creators: name: Tjoa, Suhardi.
Publisher: name: Monash University
Year: 2022

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.
Multiscale modeling functional connectivity changes through Alzheimer’s disease spectrum
Creators: name: Cabrera-Álvarez, Jesús
name: Stefanovski, Leon
name: Martin, Leon
name: Susi, Gianluca
name: Maestú, Fernando
name: Ritter, Petra
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Brain disease, network dysfunction and intervention

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
Design and development of an ambient-temperature continuously-rotating achromatic half-wave plate for CMB polarization modulation on the POLARBEAR-2 experiment
Creators: name: Hill, Charles A.
name: Beckman, Shawn
name: Chinone, Yuji
name: Goeckner-Wald, Neil
name: Hazumi, Masashi
name: Keating, Brian
name: Kusaka, Akito
name: Lee, Adrian T.
name: Matsuda, Frederick
name: Plambeck, Richard
name: Suzuki, Aritoki
name: Takakura, Satoru
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We describe the development of an ambient-temperature continuously-rotating half-wave plate (HWP) for study of the Cosmic Microwave Background (CMB) polarization by the POLARBEAR-2 (PB2) experiment. Rapid polarization modulation suppresses 1/f noise due to unpolarized atmospheric turbulence and improves sensitivity to degree-angular-scale CMB fluctuations where the inflationary gravitational wave signal is thought to exist. A HWP modulator rotates the input polarization signal and therefore allows a single polarimeter to measure both linear polarization states, eliminating systematic errors associated with differencing of orthogonal detectors. PB2 projects a 365-mm-diameter focal plane of 7,588 dichroic, 95/150 GHz transition-edge-sensor bolometers onto a 4-degree field of view that scans the sky at $\sim$ 1 degree per second. We find that a 500-mm-diameter ambient-temperature sapphire achromatic HWP rotating at 2 Hz is a suitable polarization modulator for PB2. We present the design considerations for the PB2 HWP, the construction of the HWP optical stack and rotation mechanism, and the performance of the fully-assembled HWP instrument. We conclude with a discussion of HWP polarization modulation for future Simons Array receivers.
description: To be published in Proc. of SPIE, Volume 9914, Number 99142U-1, 2016
Sonnenfleckenzeichnung Nr. 25820.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 18.01.1980, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Kuppel des Coudé vereist, nicht drehbar. Kopie der Originalzeichnung vom Sonnenturm: Beobachtung unvollständig (nicht abgeschlossen)
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm) (unklar).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen
A double-correlation tremor-location method
Creators: name: Li, Ka Lok
name: Sgattoni, Giulia
name: Sadeghisorkhani, Hamzeh
name: Roberts, Roland
name: Gudmundsson, Ólafur
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: A double-correlation method is introduced to locate tremor sources based on stacks of complex, doubly-correlated tremor records of multiple triplets of seismographs back projected to hypothetical source locations in a geographic grid. Peaks in the resulting stack of moduli are inferred source locations. The stack of the moduli is a robust measure of energy radiated from a point source or point sources even when the velocity information is imprecise. Application to real data shows how double correlation focuses the source mapping compared to the common single correlation approach. Synthetic tests demonstrate the robustness of the method and its resolution limitations which are controlled by the station geometry, the finite frequency of the signal, the quality of the used velocity information and noise level. Both random noise and signal or noise correlated at time shifts that are inconsistent with the assumed velocity structure can be effectively suppressed. Assuming a surface-wave velocity, we can constrain the source location even if the surface-wave component does not dominate. The method can also in principle be used with body waves in three dimensions, although this requires more data and seismographs placed near the source for depth resolution.
Full-Vectorial Fiber Mode Solver Based on a Discrete Hankel Transform
Creators: name: Steinke, Michael
Publisher: name: Basel : MDPI
Year: 2021
Subjects: subject: Discrete Hankel transform
subject: Modes
subject: Optical fibers
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: It is crucial to be time and resource-efficient when enabling and optimizing novel applications and functionalities of optical fibers, as well as accurate computation of the vectorial field components and the corresponding propagation constants of the guided modes in optical fibers. To address these needs, a novel full-vectorial fiber mode solver based on a discrete Hankel transform is introduced and validated here for the first time for rotationally symmetric fiber designs. It is shown that the effective refractive indices of the guided modes are computed with an absolute error of less than 10−4 with respect to analytical solutions of step-index and graded-index fiber designs. Computational speeds in the order of a few seconds allow to efficiently compute the relevant parameters, e.g., propagation constants and corresponding dispersion profiles, and to optimize fiber designs.
Time-domain optics for atomic quantum matter
Creators: name: Kanthak, Simon
name: Gebbe, Martina
name: Gersemann, Matthias
name: Abend, Sven
name: Rasel, Ernst M.
name: Krutzik, Markus
Publisher: name: [Bad Honnef] : Dt. Physikalische Ges.
Year: 2021
Subjects: subject: atom-chip traps
subject: Bose-Einstein condensates
subject: matter-wave lensing
subject: matter-wave telescope
subject: optical dipole traps
subject: time-domain optics
subject: ultra-cold atoms
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We investigate time-domain optics for atomic quantum matter. Within a matter-wave analog of the thin-lens formalism, we study optical lenses of different shapes and refractive powers to precisely control the dispersion of Bose-Einstein condensates. Anharmonicities of the lensing potential are incorporated in the formalism with a decomposition of the center-of-mass motion and expansion of the atoms, allowing to probe the lensing potential with micrometer resolution. By arranging two lenses in time formed by the potentials of an optical dipole trap and an atom-chip trap, we realize a magneto-optical matter-wave telescope. We employ this hybrid telescope to manipulate the expansion and aspect ratio of the ensembles. The experimental results are compared to numerical simulations that involve Gaussian shaped potentials to accommodate lens shapes beyond the harmonic approximation.
Towards mature object-oriented pattern research : a data mining approach
Creators: name: Lau, Stephan.
Publisher: name: Monash University
Year: 2022

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.
Sonnenfleckenzeichnung Nr. 25870.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 28.03.1980, erstellt von Hans Ulrich Keller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f sowie Gr (Anzahl g)
Brown dwarf disks with ALMA: evidence for truncated dust disks in Ophiuchus
Creators: name: Testi, L.
name: Natta, A.
name: Scholz, A.
name: Tazzari, M.
name: Ricci, L.
name: Monsalvo, I. de Gregorio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The study of the properties of disks around young brown dwarfs can provide important clues on the formation of these very low-mass objects and on the possibility of forming planetary systems around them. The presence of warm dusty disks around brown dwarfs is well known, based on near- and mid-infrared studies. High angular resolution observations of the cold outer disk are limited; we used ALMA to attempt a first survey of young brown dwarfs in the $ρ$-Oph star-forming region. All 17 young brown dwarfs in our sample were observed at 890 $μ$m in the continuum at $\sim0.\!^{\prime\prime}5$ angular resolution. The sensitivity of our observations was chosen to detect $\sim0.5$ M$_\oplus$ of dust. We detect continuum emission in 11 disks ($\sim65$\%\ of the total), and the estimated mass of dust in the detected disks ranges from $\sim0.5$ to $\sim6$ M$_\oplus$. These disk masses imply that planet formation around brown dwarfs may be relatively rare and that the supra-Jupiter mass companions found around some brown dwarfs are probably the result of a binary system formation. We find evidence that the two brightest disks in $ρ$-Oph have sharp outer edges at R
description: 12 pages, A&A in press
Effect of wetting and drying cycles on the interface of natural fibers with a Portland cement based matrix
Creators: name: Ferreira, S. R.
name: De Andrade Silva, F.
name: Lopes Lima, P. R.
name: Toledo Filho, R. D.
Publisher: name: Academic Journal of Civil Engineering
Year: 2015

description: Several fiber treatments are applied to mitigate the high water absorption of vegetal fibers. Wetting and drying cycles are usually performed in the industry of paper and cellulose to reduce the volume variation of the natural fibers. This procedure stiffens the polymeric structure of the fiber-cells (process known as hornification) resulting in a higher dimensional stability. The aim of this study is to determine the effect of the hornification on the fiber-matrix interface of natural fibers and Portland cement matrices. For this purpose, 2, 5 and 10 cycles of wet and drying was applied on Sisal, Curaua and Jute fibers. Fiber pull-out tests were performed in embedment lengths of 25mm. Furthermore, the influence of the hornification in the fibers mechanical (under tensile loading) and microstructural (surface modifications of the fiber and changes in the fibercell structure) behavior were investigated. The results indicate changes on the tensile strength and strain capacity of the studied fibers, showing that morphology, physical aspects and chemical composition play an important role on the efficiency rate of hornification.
description: Academic Journal of Civil Engineering, Vol 33 No 2 (2015): Special Issue - ICBBM 2015
Can we infer excitation-inhibition balance from the spectrum of population signals?
Creators: name: Helson, Pascal
name: Chakravarty, Kingshuk
name: Roy, Sangheeta
name: Sinha, Aniruddha
name: Kumar, Arvind
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Brain disease, network dysfunction and intervention

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
Nanopore creation in MoS2 and graphene monolayers by nanoparticles impact: a reactive molecular dynamics study
Creators: name: Noori, Hamidreza
name: Mortazavi, Bohayra
name: Keshtkari, Leila
name: Zhuang, Xiaoying
name: Rabczuk, Timon
Publisher: name: Berlin ; Heidelberg ; New York : Springer
Year: 2021
Subjects: subject: Graphene
subject: Impact
subject: Molecular dynamics
subject: MoS 2
subject: Nanopore
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this work, extensive reactive molecular dynamics simulations are conducted to analyze the nanopore creation by nanoparticles impact over single-layer molybdenum disulfide (MoS2) with 1T and 2H phases. We also compare the results with graphene monolayer. In our simulations, nanosheets are exposed to a spherical rigid carbon projectile with high initial velocities ranging from 2 to 23 km/s. Results for three different structures are compared to examine the most critical factors in the perforation and resistance force during the impact. To analyze the perforation and impact resistance, kinetic energy and displacement time history of the projectile as well as perforation resistance force of the projectile are investigated. Interestingly, although the elasticity module and tensile strength of the graphene are by almost five times higher than those of MoS2, the results demonstrate that 1T and 2H-MoS2 phases are more resistive to the impact loading and perforation than graphene. For the MoS2nanosheets, we realize that the 2H phase is more resistant to impact loading than the 1T counterpart. Our reactive molecular dynamics results highlight that in addition to the strength and toughness, atomic structure is another crucial factor that can contribute substantially to impact resistance of 2D materials. The obtained results can be useful to guide the experimental setups for the nanopore creation in MoS2or other 2D lattices.
Assessment of infant cortical network integrity using EEG to measure global visual processing
Creators: name: Hokkanen, Henri
name: Ahtola, Eero
name: Stjerna, Susanna
name: Metsäranta, Marjo
name: Tokariev, Anton
name: Vanhatalo, Sampsa
Publisher: name: G-Node
Year: 2023
Subjects: Computational Neuroscience
Brain disease, network dysfunction and intervention

description: Bernstein Conference 2023 abstract. https://bernstein-conference.de
Wieviel Grünland wird in Deutschland für Pferde genutzt? Versuch einer Quantifizierung anhand von Bestands- und Praxisdaten.
Creators: name: Schmitz, Anja
name: Isselstein, Johannes
Publisher: name: Bundesministerium für Ernährung und Landwirtschaft
Year: 2018

description: Das Ziel der Studie ist es, erstmals die Bedeutung der Pferdehaltung für die Grünlandnutzung in Deutschland zu quantifizieren. Hierfür werden Primärdaten statistischer Ämter und der Tierseuchenkassen, sowie Daten zur Flächenausstattung von Praxisbetrieben (n = 696) ausgewertet. Ein erster Schritt quantifiziert die von Pferden genutzte Grünlandfläche über den anzunehmenden Futterbedarf des Pferdebestands je Bundesland und die Ertragsleistung des Grünlands. In einem weiteren Schritt wird die Schätzung auf Basis der mittleren Flächenausstattung der befragten Betriebe und ihres jeweiligen Raufutterzukaufs präzisiert. So konnte eine qualifizierte Schätzung der bewirtschafteten Fläche auf Basis verschiedener Datengrundlagen vorgenommen werden.

Als Ergebnis kann in Deutschland insgesamt von einem Anteil von 15-20 % am Grünland ausgegangen werden, das für Pferde bewirtschaftet wird. Zwischen den Bundesländern gibt es jedoch größere Unterschiede. Ausgesprochene Schwerpunkte der Grünlandnutzung für die Pferdehaltung finden sich in Nordrhein-Westfalen (115.000 ha, 30 % des Grünlands) und Niedersachsen (163.000 ha, 23 % des Grünlands). Generell lassen die erfassten Praxisdaten auf eine vergleichsweise extensive Bewirtschaftung (Ø 0,8 ha/GV) kleiner Schlaggrößen durch Pferdehalter schließen. Die Kleinstrukturiertheit der Betriebe (Ø 5,6 ha für Pferde genutztes GL je Betrieb) weist besonders darauf hin, dass die Pferdehaltung hinsichtlich des Nutzungserhalts ökologisch wertvollen Grünlands in der Streulage eine große Bedeutung hat. Die Studie verdeutlicht somit die Relevanz von Pferden in unserer Agrarlandschaft und die dringliche Notwendigkeit die Landnutzung durch Pferdehalter zur analysieren.
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Band 96, Heft 1, Mai 2018
Sonnenfleckenzeichnung Nr. 25865.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 21.03.1980, erstellt von Hans Ulrich Keller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f sowie Gr (Anzahl g)
In situ ac Stark shift detection in light storage spectroscopy
Creators: name: Palani, D.
name: Hoenig, D.
name: Karpa, L.
Publisher: name: Bristol : IOP Publ.
Year: 2021
Subjects: subject: atomic clocks
subject: coherent control
subject: light-matter interaction
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We report on a method for measuring ac Stark shifts observed in stored light experiments while simultaneously determining the energetic splitting between the electronic ground states involved in the two-photon transition. To this end, we make use of the frequency matching effect in light storage spectroscopy. We find a linear dependence on the intensity of the control field applied during the retrieval phase of the experiment. At the same time, we observe that the light shift is insensitive to the intensity of the signal field which is in contrast to continuously operated electromagnetically induced transparency (EIT) or coherent population trapping (CPT) experiments, where the light shifts induced by all participating optical fields have to be taken into account. Our results may be of importance for future precision measurements in addition to or in combination with current EIT and CPT-type devices which are largely compatible with our approach and could benefit from the inherent robustness regarding operational conditions, shape of the resonances or intensity fluctuations in the signal field.
Artificial Intelligence, Social Media and Supply Chain Management: The Way Forward
Creators: name: Khatua, Apalak
name: Khatua, Aparup
name: Chi, Xu
name: Cambria, Erik
Publisher: name: Basel : MDPI
Year: 2021
Subjects: subject: AI
subject: Context-aware sentiment analysis
subject: Social media
subject: Supply chain management
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Supply chain management (SCM) is a complex network of multiple entities ranging from business partners to end consumers. These stakeholders frequently use social media platforms, such as Twitter and Facebook, to voice their opinions and concerns. AI-based applications, such as sentiment analysis, allow us to extract relevant information from these deliberations. We argue that the context-specific application of AI, compared to generic approaches, is more efficient in retrieving meaningful insights from social media data for SCM. We present a conceptual overview of prevalent techniques and available resources for information extraction. Subsequently, we have identified specific areas of SCM where context-aware sentiment analysis can enhance the overall efficiency.
3D AMR simulations of G2 as an outflow
Creators: name: Ballone, A.
name: Schartmann, M.
name: Burkert, A.
name: Gillessen, S.
name: Plewa, P. M.
name: Pfuhl, O.
name: Genzel, R.
name: Eisenhauer, F.
name: Ott, T.
name: George, E. M.
name: Habibi, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the evolution of G2 in a \textit{Compact Source Scenario}, where G2 is the outflow from a low-mass central star moving on the observed orbit. This is done through 3D AMR simulations of the hydrodynamic interaction of G2 with the surrounding hot accretion flow. A comparison with observations is done by means of mock position-velocity (PV) diagrams. We found that a massive ($\dot{M}_\mathrm{w}=5\times 10^{-7} \;M_{\odot} \; \mathrm{yr^{-1}}$) and slow ($v_\mathrm{w}=50 \;\mathrm{km\; s^{-1}}$) outflow can reproduce G2's properties. A faster outflow ($v_\mathrm{w}=400 \;\mathrm{km\; s^{-1}}$) might also be able to explain the material that seems to follow G2 on the same orbit.
description: 2 pages, 1 figure, Proceedings of IAU Symposium 322: The Multi-Messenger Astrophysics of the Galactic Centre
Sonnenfleckenzeichnung Nr. 25912.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 23.05.1980, erstellt von Hans Ulrich Keller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1980

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f sowie Gr (Anzahl g)
title: Linear Languages with a Nonassociative Concatenation
Creators: name: Germain, Christian
name: Pallo, Jean
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 2002

description: We introduce a new Kleene star operation. Linear languages with a nonassociative
concatenation can then be denoted by regular-like expressions using this Kleene star
operation. The proposed method can also be applied to linear languages with the usual
associative concatenation.
description: Journal of Automata, Languages and Combinatorics, Volume 7, Number 3, 2002, 311-320