cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Trapping oscillations, discrete particle effects and kinetic theory of collisionless plasma
Creators: name: Doveil, F.
name: Firpo, M-C.
name: Elskens, Y.
name: Guyomarc'h, D.
name: Poleni, M.
name: Bertrand, P.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Effects induced by the finite number $N$ of particles on the evolution of a monochromatic electrostatic perturbation in a collisionless plasma are investigated. For growth as well as damping of a single wave, discrete particle numerical simulations show a $N$-dependent long time behavior which differs from the numerical errors incurred by vlasovian approaches and follows from the pulsating separatrix crossing dynamics of individual particles.
description: LaTeX, 4 figures
Sample Efficient Learning of Path Following and Obstacle Avoidance Behavior for Quadrotors
Creators: name: Stevsic, Stefan
name: Naegeli, Tobias
name: Alonso-Mora, Javier
name: Hilliges, Otmar
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper we propose an algorithm for the training of neural network control policies for quadrotors. The learned control policy computes control commands directly from sensor inputs and is hence computationally efficient. An imitation learning algorithm produces a policy that reproduces the behavior of a path following control algorithm with collision avoidance. Due to the generalization ability of neural networks, the resulting policy performs local collision avoidance of unseen obstacles while following a global reference path. The algorithm uses a time-free model predictive path-following controller as a supervisor. The controller generates demonstrations by following few example paths. This enables an easy to implement learning algorithm that is robust to errors of the model used in the model predictive controller. The policy is trained on the real quadrotor, which requires collision-free exploration around the example path. An adapted version of the supervisor is used to enable exploration. Thus, the policy can be trained from a relatively small number of examples on the real quadrotor, making the training sample efficient.
description: 8 pages
Rebelia perlucidella
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Rebelia
Rebelia perlucidella

description: Rebelia perlucidella (BRUAND, 1853)
F u n d n a c h w e i s e:7 09.04.1995, 2, 40 Säcke 10.04.1995: Ronchi.
P h ä n o l o g i e / H a b i t a t e: Die Flugzeit der Nominatform erstreckt sich von Anfang April bis Anfang Mai. Den Lebensraum bilden die küstennahen Karstgebiete von Triest, Sloweniens und Kroatiens, südlich bis zur Insel Rab (Weidlich 2013: unveröff.). In der Höhenverbreitung kommt die Art vom Meeresspiegelniveau bis auf 400 m NN vor (Rab).
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1925, DOI: 10.5281/zenodo.5286493
$\hbar$ corrections in semi-classical formula for smooth chaotic dynamics
Creators: name: Gremaud, Benoit
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The validity of semiclassical expansions in the power of $\hbar$ for the quantum Green's function have been extensively tested for billiards systems, but in the case of chaotic dynamics with smooth potential, even if formula are existing, a quantitative comparison is still missing. In this paper, extending the theory developed by Gaspard et al., Adv. Chem. Phys. XC 105 (1995), based on the classical Green's functions, we present an efficient method allowing the calculation of $\hbar$ corrections for the propagator, the quantum Green's function, and their traces. Especially, we show that the previously published expressions for $\hbar$ corrections to the traces are incomplete.
description: 19 pages, 4 figures, to be published in Phys. Rev. E shortened version, corrected typos
The Plasticity of Flesh and Bone: Transforming the Body Through Somaesthetic Experience
Creators: name: Elliot, Scott
Publisher: name: The Journal of Somaesthetics
Year: 2019

description: This paper explores how the human mechanisms of gene expression may be used in novel artistic practices which use the human body as material. Examining historical examples of artists who use the body as material along with popular culture body modification practices, epigenetic transformations are put forward as a method to be explored in new forms of artistic practice. Examples of speculative fiction, works of architecture and psychotherapeutic devices are investigated towards outlining a direction for such a practice.
description: The Journal of Somaesthetics, Vol. 5 Núm. 1 (2019): BODY FIRST: Somaesthetics and Popular Culture
Acanthopsyche ecksteini
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Acanthopsyche
Acanthopsyche ecksteini

description: Acanthopsyche ecksteini (LEDERER, 1855)
F u n d n a c h w e i s e 42 Säcke 09./ 10.04.1995, 7 Säcke 04.05.1996, 2 Säcke 21.04.2013: Ronchi.
P h ä n o l o g i e / H a b i t a t e: Die Imagines treten vom April bis Anfang Mai auf. Ebenfalls nur im Karst bei Triest gefunden, lokal aber häufig. Aus Italien nur noch aus Südtirol und dem Friaul bekannt, jedoch mit keinen neuen Funden versehen (vergl. PARENZAN & PORCELLI 2005-2006: 21)
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1925, DOI: 10.5281/zenodo.5286493
Neutron Star Merger Afterglows: Population Prospects for the Gravitational Wave Era
Creators: name: Duque, Raphaël
name: Mochkovitch, Robert
name: Daigne, Frédéric
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Following the historical observation of GW170817 and its electromagnetic follow-up, new neutron star merger afterglows are expected to be observed as counterparts to gravitational wave signals during the next science runs of the gravitational interferometer network. The diversity of the observed population of afterglows of these future events is subject to various factors, which are (i) intrinsic, such as the energy of the ejecta, (ii) environmental, such as the ambient medium density or (iii) observational, such as the viewing angle and distance of the source. Through prescribing a population of mergers and modelling their afterglows, we study the diversity of those events to be observed jointly in gravitational waves and electromagnetic bands. In the future, observables of detected events such as viewing angle, distance, afterglow peak flux or proper motion will form distributions which together with predictions from our study will provide insight on neutron star mergers and their environments.
description: Proceedings of "The New Era of Multi-Messenger Astrophysics" (2019), Groningen, The Netherlands
Topologically protected quantum bits from Josephson junction arrays
Creators: name: Ioffe, L. B.
name: Feigel'man, M. V.
name: Ioselevich, A.
name: Ivanov, D.
name: Troyer, M.
name: Blatter, G.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: All physical implementations of quantum bits (qubits), carrying the information and computation in a putative quantum computer, have to meet the conflicting requirements of environmental decoupling while remaining manipulable through designed external signals. Proposals based on quantum optics naturally emphasize the aspect of optimal isolation, while those following the solid state route exploit the variability and scalability of modern nanoscale fabrication techniques. Recently, various designs using superconducting structures have been successfully tested for quantum coherent operation, however, the ultimate goal of reaching coherent evolution over thousands of elementary operations remains a formidable task. Protecting qubits from decoherence by exploiting topological stability, a qualitatively new proposal due to Kitaev, holds the promise for long decoherence times, but its practical physical implementation has remained unclear so far. Here, we show how strongly correlated systems developing an isolated two-fold degenerate quantum dimer liquid groundstate can be used in the construction of topologically stable qubits and discuss their implementation using Josephson junction arrays.
description: 6 pages, 4 figures
Canephora hirsuta
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Gentianales
Rubiaceae
Canephora
Canephora hirsuta

description: Canephora hirsuta (PODA, 1761)
F u n d n a c h w e i s e 2 Säcke 10.04.1995, i. A. Säcke 15.04.1999: Jamiano; 1 Sack 01.04.2005: Muzzana del Turgagno; 1 Sack 25.04.2015: Vette Scabre, 1.000 m NN; 1 Sack 01.05.2015: Monte Sirino, 1.000 m NN.
P h ä n o l o g i e / H a b i t a t e: Die verbreitete Art fliegt von Mai bis Juli. Ihre Lebensraumbindung weist eine breit ökologische Valenz auf, von xerothermen Lokalitäten bis zu feuchten Wiesen und Mooren. In Italien hauptsächlich in den nördlichen Regionen vorkommend, südlich aber auch bis Kalabrien und auf Sizilien (PARENZAN & PORCELLI 2005-2006: 21).
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1926, DOI: 10.5281/zenodo.5286493
Algorithms for Quantum Control without Discontinuities; Application to the Simultaneous Control of two Qubits
Creators: name: D'Alessandro, Domenico
name: Sheller, Benjamin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We propose a technique to design control algorithms for a class of finite dimensional quantum systems so that the control law does not present discontinuities. The class of models considered admits a group of symmetries which allows us to reduce the problem of control to a quotient space where the control system is `fully actuated'. As a result we can prescribe a desired trajectory which is, to some extent, arbitrary and derive the corresponding control. We discuss the application to the simultaneous control of two non-interacting spin 1/2 particles with different gyromagnetic ratios in zero field NMR in detail. Our method provides a flexible toolbox for the design of control algorithms to drive the state of finite dimensional quantum systems to any desired final configuration with smooth controls.
Coherent spin valve phenomena and electrical spin injection in ferromagnetic/semiconductor/ferromagnetic junctions
Creators: name: Mireles, F.
name: Kirczenow, G.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Coherent quantum transport in ferromagnetic/ semiconductor/ ferromagnetic junctions is studied theoretically within the Landauer framework of ballistic transport. We show that quantum coherence can have unexpected implications for spin injection and that some intuitive spintronic concepts which are founded in semi-classical physics no longer apply: A quantum spin-valve (QSV) effect occurs even in the absence of a net spin polarized current flowing through the device, unlike in the classical regime. The converse effect also arises, i.e. a zero spin-valve signal for a non-vanishing spin-current. We introduce new criteria useful for analyzing quantum and classical spin transport phenomena and the relationships between them. The effects on QSV behavior of spin-dependent electron transmission at the interfaces, interface Schottky barriers, Rashba spin-orbit coupling and temperature, are systematically investigated. While the signature of the QSV is found to be sensitive to temperature, interestingly, that of its converse is not. We argue that the QSV phenomenon can have important implications for the interpretation of spin-injection in quantum spintronic experiments with spin-valve geometries.
description: 15 pages including 11 figures. To appear in PRB
Stichobasis hofmanni
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Stichobasis
Stichobasis hofmanni

description: Stichobasis hofmanni (HEYLAERTS, 1879)
F u n d n a c h w e i s e: 6Säcke, 10.01.2015: Castelmola (Abb. 4); 6 Säcke, 12.01.2015, 1 e.l. 28.04.2015: Necropoli di Pantalica.
P h ä n o l o g i e / H a b i t a t e: Schlupfdaten liegen bisher vom frühen Juni bis Anfang Juli vor. Hinzu kommt der Schlupf eines Ende April, der jedoch auf die Zuchtbedingungen zurückgeführt werden kann. Sie lebt an grasigen, xerothermen und südlich ausgerichteten Plätzen in der Felslandschaft (Abb. 4). Die Art ist bisher nur von Sizilien (vergl. u.a. SIEDER 1975: 94; PARENZAN & PORCELLI 2005-2006: 17) und Kalabrien (STAUDER: 1924: 39; PARENZAN & PORCELLI 2005-2006: 17; SCALERCIO 2009: 171) bekannt.
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1925, DOI: 10.5281/zenodo.5286493
Strange Attractors in Multipath propagation: Detection and characterisation
Creators: name: Tannous, C.
name: Davies, R.
name: Angus, A.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Chaotic Dynamics (nlin.CD)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Multipath propagation of radio waves in indoor/outdoor environments shows a highly irregular behavior as a function of time. Typical modeling of this phenomenon assumes the received signal is a stochastic process composed of the superposition of various altered replicas of the transmitted one, their amplitudes and phases being drawn from specific probability densities. We set out to explore the hypothesis of the presence of deterministic chaos in signals propagating inside various buildings at the University of Calgary. The correlation dimension versus embedding dimension saturates to a value between 3 and 4 for various antenna polarizations. The full Liapunov spectrum calculated contains two positive exponents and yields through the Kaplan-Yorke conjecture the same dimension obtained from the correlation sum. The presence of strange attractors in multipath propagation hints to better ways to predict the behaviour of the signal and better methods to counter the effects of interference. The use of Neural Networks in non linear prediction will be illustrated in an example and potential applications of same will be highlighted.
description: 12 pages, 6 figures. Invited paper, published in Visual Information Processing, SPIE Proceedings, Vol. 1705
Shell Models for Magnetohydrodynamic Turbulence
Creators: name: Giuliani, Paolo
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We review the main properties of shell models for magnetohydrodynamic (MHD) turbulence. After a brief account on shell models with nearest neighbour interactions, the paper focuses on the most recent results concerning dynamical properties and intermittency of a model which is a generalization to MHD of the Gledzer-Yamada-Okhitani (GOY) model for hydrodynamic. Applications to astrophysical problems are also discussed.
Analytical design of flat-top transmission filters composed of several resonant structures
Creators: name: Doskolovich, Leonid L.
name: Golovastikov, Nikita V.
name: Bykov, Dmitry A.
name: Bezus, Evgeni A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Resonant properties of composite structures consisting of several identical resonant diffractive structures (e.g. multilayer thin-film structures or guided-mode resonance gratings) separated by phase-shift layers are investigated theoretically. Using the scattering matrix formalism, we analytically demonstrate that, at properly chosen thicknesses of the phase-shift layers, the composite structures comprising two or four resonant diffractive structures with a Lorentzian transmittance profile optically implement the Butterworth filters of the order two or three, respectively, and enable achieving flat-top transmission spectra with steep slopes and low sidebands. In addition, we show that the composite structures consisting of three or four second-order Butterworth filters can accurately approximate the fourth- or fifth-order Butterworth filters, respectively. The presented theoretical results are confirmed by rigorous numerical simulations of composite structures consisting of the so-called W-structures (simple three-layer resonant structures comprising a high-index core layer and two low-index cladding layers in a high-index dielectric environment). The simulation results confirm the formation of flat-top transmittance peaks, the shape of which fully agrees with the derived theoretical description. Moreover, we demonstrate an exceptionally simple mechanism of controlling the transmittance peak width, which consists in changing the thicknesses of the cladding layers of the initial W-structure and enables generating flat-top transmission peaks with a significantly subnanometer size.
description: 11 pages, 4 figures
David Cecil Smith - Bibliography from SIR DAVID CECIL SMITH. 21 May 1930 — 29 June 2018
Creators: name: Douglas, Angela E.
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: Plant Biology
subject: FOS: Biological sciences

description: David Smith was an international authority in the biological discipline of symbiosis and an influential leader in academic life. Through his work on photosynthetic symbioses in lichens and invertebrate animals, David transformed the field of symbiosis from a study of taxonomy and morphology into an experimental science. In particular, he applied novel radiotracer techniques to demonstrate that lichens are metabolically dynamic, with photosynthetically-fixed carbon transferred from symbionts to lichen host at high rates. His subsequent study of diverse symbioses led him to develop common principles underlying symbioses, including the regulated transfer of metabolites between partners and the role of ecological processes of colonization and community assembly in the establishment of symbioses. In his academic service, David had multiple leadership roles, including head of the Department of Botany at University of Bristol (1974–1980), head of the Department of Agricultural Science at University of Oxford (1980–1987), principal of University of Edinburgh (1987–1994) and president of Wolfson College, University of Oxford (1994–2000). David was biological secretary of the Royal Society (1983–1987) and he was knighted in 1986.
Acanthopsyche zelleri
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Acanthopsyche
Acanthopsyche zelleri

description: Acanthopsyche zelleri (MANN, 1855)
F u n d n a c h w e i s e:1Sack 09.04.1995: Ronchi.
P h ä n o l o g i e / H a b i t a t e: Lediglich ein einzelner Sackfund im Karstgebiet bei Triest. Aus Italien nach PARENZAN & PORCELLI (2005-2006: 21) nur in den nördlichen Regionen Lombardei, Südtirol, Friaul und Venetien bekannt.
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1925, DOI: 10.5281/zenodo.5286493
Fractional and unquantized dc voltage generation in THz-driven semiconductor superlattices
Creators: name: Alekseev, Kirill N.
name: Cannon, Ethan H.
name: Kusmartsev, Feodor V.
name: Campbell, David K.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider the spontaneous creation of a dc voltage across a strongly coupled semiconductor superlattice subjected to THz radiation. We show that the dc voltage may be approximately proportional either to an integer or to a half- integer multiple of the frequency of the applied ac field, depending on the ratio of the characteristic scattering rates of conducting electrons. For the case of an ac field frequency less than the characteristic scattering rates, we demonstrate the generation of an unquantized dc voltage.
description: 6 pages, 3 figures, RevTEX, EPSF. Revised version v3: corrected typos
Discovery of Soft X-ray Pulsations from PSR J1231-1411 using NICER
Creators: name: Ray, Paul S.
name: Guillot, Sebastien
name: Ransom, Scott M.
name: Kerr, Matthew
name: Bogdanov, Slavko
name: Harding, Alice K.
name: Wolff, Michael T.
name: Malacaria, Christian
name: Gendreau, Keith C.
name: Arzoumanian, Zaven
name: Markwardt, Craig
name: Soong, Yang
name: Doty, John P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the discovery of soft X-ray pulsations from the nearby millisecond pulsar PSR J1231$-$1411 using NICER. The pulsed emission is characterized by a broad and asymmetric main pulse and a much fainter secondary interpulse, with a total pulsed count rate of 0.055 c s$^{-1}$ in the 0.35-1.5 keV band. We analyzed Fermi LAT data to update the pulse timing model covering 10 years of data and used that model to coherently combine NICER data over a year of observations. Spectral modeling suggests that the flux is dominated by thermal emission from a hot spot (or spots) on the neutron star surface. The phase relationship between the X-ray pulse and the radio and $γ$ rays provides insight into the geometry of the system.
description: ApJ Letters, in press
Stracke_2017_Quality_Open_Online_Education_Learning_WLS_LINQ.pdf
Creators: name: Stracke, Christian M.
Publisher: name: figshare
Year: 2019
Subjects: subject: 139999 Education not elsewhere classified
subject: FOS: Educational sciences
subject: 130306 Educational Technology and Computing
subject: 130304 Educational Administration, Management and Leadership
subject: 130303 Education Assessment and Evaluation
subject: 130309 Learning Sciences
subject: Education
subject: 130103 Higher Education
subject: 130106 Secondary Education
subject: 160506 Education Policy
subject: FOS: Political science
subject: 130105 Primary Education (excl. Maori)
subject: 130101 Continuing and Community Education
subject: 130199 Education systems not elsewhere classified
subject: 220202 History and Philosophy of Education
subject: FOS: Philosophy, ethics and religion
subject: 130313 Teacher Education and Professional Development of Educators
subject: 130213 Vocational Education and Training Curriculum and Pedagogy

description: Societal, educational and personal changes are shaking economies, working and living conditions as well as the whole world. The raise of the world-wide internet and social media including online communities is affecting societies and people’s lives as well as personal learning. Open (Online) Education has experienced a major development raising awareness amongst all actors including global grass-root movements, events, communities and associations as well as international policies and implementations in national and regional educational systems. During the last years Massive Open Online Courses (MOOCs) became very popular: Since the year 2008 with the first MOOC the number of MOOCs is constantly increasing. The year 2012 was considered as the "Year of the MOOCs" leading to a global debate about their quality as an educational tool that is increasing since then. To address the quality issues, MOOQ, the European Alliance for the Quality of MOOCs was initiated. Based on a literature review and analysis of existing quality approaches and indicators for MOOCs, the first Global MOOC Survey was designed and conducted for three target groups (MOOC learners, designers and facilitators) with the support by the leading international associations and institutions. Afterwards the results from the survey were complemented by qualitative and semi-structured interviews with MOOC designers, facilitators and providers to gain more in-depth details and insights. The final objective is the development of the Quality Reference Framework (QRF) with quality indicators and tools in close collaboration with all interested stakeholders worldwide. This paper presents the first QRF draft for further discussion.
Clearly Discriminate the Continuum Band and Exciton State of the Hybrid Lead Bromide Perovskite
Creators: name: Shi, Jiangjian
name: Li, Yiming
name: Wu, Jionghua
name: Wu, Huijue
name: Luo, Yanhong
name: Li, Dongmei
name: Jasieniak, Jacek J.
name: Meng, Qingbo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Electronic states of the hybrid perovskite enable their promising applications as distinctive optoelectronic materials. The understanding of their electronic structures and charge characters remains highly controversial. The electronic mechanism such as reabsorption, Urbach tail and indirect band for interpreting dual-peak emissions is one of the controversial focuses. Herein, we report that through heterojunction enhanced exciton dissociation and global tracing of multiple radiative electronic states across wide temperature regions, we have succeeded in directly observing free carrier emissions from the hybrid lead bromide perovskite and clearly discriminating the direct continuum band and exciton states. The widely-concerned dual-peak emissions are clarified to be excitonic, arising from two types of exciton states of the perovskite. These excitons possess giant binding energies and superior phase stability compared to conventional inorganic semiconductors, providing important implications for exploiting the excitonic mechanism for realizing novel optoelectronic applications.
Pachythelia villosella
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Pachythelia
Pachythelia villosella

description: Pachythelia villosella (OCHSENHEIMER, 1810)
F u n d n a c h w e i s e 1 Sack 09.04.1995: Trasaghis; 1 Sack 28.10.1997: Andagna; 1 Sack 31.10.1997: Cinque Terre; 1 Sack 15.07.2005: Bionaz.
P h ä n o l o g i e / H a b i t a t e: Ebenfalls weit verbreitet und die Imagines erscheinen von April bis Juni. Obwohl die Art ebenfalls eine hohe ökologische Valenz aufweist, stammen die neuen Funde ausschliesslich von Xerothermstandorten.
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1926, DOI: 10.5281/zenodo.5286493
Forecasting Super-Sample Covariance in Future Weak Lensing Surveys with SuperSCRAM
Creators: name: Digman, Matthew C.
name: McEwen, Joseph E.
name: Hirata, Christopher M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The observable universe contains density perturbations on scales larger than any finite volume survey. Perturbations on scales larger than a survey can measure degrade its power to constrain cosmological parameters. The dependence of survey observables such as the weak lensing power spectrum on these long-wavelength modes results in super-sample covariance. Accurately forecasting parameter constraints for future surveys requires accurately accounting for the super-sample effects. If super-sample covariance is in fact a major component of the survey error budget, it may be necessary to investigate mitigation strategies that constrain the specific realization of the long-wavelength modes. We present a Fisher matrix based formalism for approximating the magnitude of super-sample covariance and the effectiveness of mitigation strategies for realistic survey geometries. We implement our formalism in the public code SuperSCRAM: Super-Sample Covariance Reduction and Mitigation. We illustrate SuperSCRAM with an example application, where the modes contributing to super-sample covariance in the WFIRST weak lensing survey are constrained by the low-redshift galaxy number counts in the wider LSST footprint. We find that super-sample covariance increases the volume of the error ellipsoid in 7D cosmological parameter space by a factor of 4.5 relative to Gaussian statistical errors only, but our simple mitigation strategy more than halves the contamination, to a factor of 2.0.
description: 32 pages, 7 figures, 1 table, comments/suggestions welcome!
Oxycarenus (Oxycarenus) hyalinipennis
Creators: name: Linnavuori, Rauno E.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Oxycarenidae
Oxycarenus
Oxycarenus hyalinipennis

description: Oxycarenus (Oxycarenus) hyalinipennis (A. Costa, 1843)
 Material examined. GILAN: Rustam Abad – Salan Sar, 1 specimen, 6.-8.v.2001.
 Comments. On Malvaceae such as Abutilon. Palaeotropical.
description: Published as part of Linnavuori, Rauno E., 2007, Studies on the Lygaeidae s. lat. (Heteroptera) of Gilan and the adjacent provinces in northern Iran, pp. 57-75 in Acta Entomologica Musei Nationalis Pragae 47 on page 68, DOI: 10.5281/zenodo.5328517
Topological Hall Effect and Emergent Skyrmion Crystal in Manganite-Iridate Oxide Interfaces
Creators: name: Mohanta, Narayan
name: Dagotto, Elbio
name: Okamoto, Satoshi
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Scalar spin chirality is expected to induce a finite contribution to the Hall response at low temperatures. We study this spin-chirality-driven Hall effect, known as the topological Hall effect, at the manganite side of the interface between La$_{1-x}$Sr$_{x}$MnO$_{3}$ and SrIrO$_3$. The ferromagnetic double-exchange hopping at the manganite layer, in conjunction with the Dzyaloshinskii-Moriya (DM) interaction which arises at the interface due to broken inversion symmetry and strong spin-orbit coupling from the iridate layer, could produce a skyrmion-crystal (SkX) phase in the presence of an external magnetic field. Using the Monte Carlo technique and a two-orbital spin-fermion model for manganites, supplemented by an in-plane DM interaction, we obtain phase diagrams which reveal at low temperatures a clear SkX phase and also a low-field spin-spiral phase. Increasing temperature, a skyrmion-gas phase, precursor of the SkX phase upon cooling, was identified. The topological Hall effect primarily appears in the SkX phase, as observed before in oxide heterostructures. We conclude that the manganite-iridate superlattices provide another useful platform to explore a plethora of unconventional magnetic and transport properties.
description: 9 pages, 5 figures
The role of urbanization in slum formation at galkacayo, somalia.
Creators: name: Mohamud, Egge Jama
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Urbanization/legislation & jurisprudence
subject: urbanization
subject: slum formation

description: ABSTRACT

Now a day, slums are growing much faster than they have been in the past. Urbans become more hostile to the formation of slums due to the economic and social attributes of urbans, this paper tried to understand the role of recent urbanization has contributed to the formation of slums and informal settlements. The objectives of the research ware, Identify the relationship between low-income characterized urbans and formation of slums Identify the relationship between house-scares characterized urbans and formation of slums, Identify the relationship between urbans that is characterized with social service provision and formation of slums, and Analyze the rural migration patterns that contributed to the formation of Galkacayo Slums. A sample of 101 has been taken from a population of 1200 slums in Galakacayo,. Quantitative Descriptive family survey has been employed in the process. We found that there those with lower income had approached to the city. The families are attracted by the service available in the city. Availability of accommodations housing and places to erect temporary housing in the slums has also contributed to the formation of slums. All those factors contributed to the migration of the people either from other part of the city or from rural or even from another town of Somalia. Finally, this will contribute to the process of urban planning polices and procedure to incorporate usually unplanned settlement that can happen any time anywhere.
Electrical bias driven effects for spintronic applications : ferromagnetic and antiferromagnetic materials
Creators: name: Williamson, Morgan Cole
name: 0000-0002-6867-9916
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Spintronics
Transition metal oxide
Voltage controlled magnetic anisotropy
VCMA
Magnetic tunnel junction
MTJ
Spin-transfer torque
STT
Nonvolatile
Magnetic memory
Ferromagnetic resonance
FMR

description: The ever-present demand for computing technology advancement has not only compelled progress toward the refinement of conventional CMOS routes, but has also driven new, less orthodox schemes whose advantages lie in branching out to access more of a system’s degrees of freedom. Spintronics, one such alternative scheme now adopted by Intel and Samsung (among others), is being proven out for memory applications in mass production. Spintronics is a field of study that exploits electron spin as well as charge for encoding binary information. Although still using nanomagnets to store data, spintronics transcends previous hard disk drive technology by pursuing nonvolatile solid-state magnetic memory. In this work, we investigate voltage controlled magnetic anisotropy in magnetic tunnel junctions and study the transition metal oxide Sr₃Ir₂O₇ for use in antiferromagnetic spintronics, which aims at high speed, high density memory applications. In the antiferromagnetic Mott insulator Sr₃Ir₂O₇, we study the effects of an applied bias on its transport properties. For instance, we demonstrate that the bias can produce changes in the materials’ resistivity, including a reversible resistive switching, consistent with electric field driven lattice distortions. The strong spin-orbit coupling in Sr₃Ir₂O₇ locking the crystal structure to the magnetic moments suggests that any structural transition is important for controlling the magnetic order of AFM devices. We use time-based measurements to study the thermal activation behavior of the resistive switching process in Sr₃Ir₂O₇ and acquire information about the energy barrier associated with the transition, including dependence on applied bias and temperature. We also demonstrate that the high bias switching state displays an increased noise pattern indicative of a dynamical state. Our observations support the possibility of controlling magnetic order in TMOs using electrical bias. We also quantify the effects of VCMA in both perpendicular and in-plane MTJs using ferromagnetic resonance. In perpendicular MTJs, we observe a linear dependence of VCMA on applied voltage with a maximum virtual field of 40 mT and a saturation of the effect above 2 V. The effect of VCMA shows a quadratic dependence for in-plane MTJs with a maximum virtual field of 20 mT. With the mainstream adoption of MRAM, efforts studying VCMA and other electric field driven effects will be crucial to increasing the energy efficiency and viability of future spintronic memory devices
Effect of Impurities and Effective Masses on Spin-Dependent Electrical Transport in Ferromagnet-Normal Metal-Ferromagnet Hybrid Junctions
Creators: name: Zhu, Zhen-Gang
name: Su, Gang
name: Jin, Biao
name: Zheng, Qing-Rong
Publisher: name: arXiv
Year: 2002
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The effect of nonmagnetic impurities and the effective masses on the spin-dependent transport in a ferromagnet-normal metal-ferromagnet junction is investigated on the basis of a two-band model. Our results show that impurities and the effective masses of electrons in two ferromagnetic electrodes have remarkable effects on the behaviors of the conductance, namely, both affect the oscillating amplitudes, periods, as well as the positions of the resonant peaks of the conductance considerably. The impurity tends to suppress the amplitudes of the conductance, and makes the spin-valve effect less obvious, but under certain conditions the phenomenon of the so-called impurity-induced resonant tunneling is clearly observed. The impurity and the effective mass both can lead to nonmonotonous oscillation of the junction magnetoresistance (JMR) with the incident energy and the thickness of the normal metal. It is also observed that a smaller difference of the effective masses of electrons in two ferromagnetic electrodes would give rise to a larger amplitude of the JMR.
description: Revtex, 10 figures
Metacanthus (Metacanthus) meridionalis
Creators: name: Linnavuori, Rauno E.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Berytidae
Metacanthus
Metacanthus meridionalis

description: Metacanthus (Metacanthus) meridionalis (A. Costa, 1843)
 Material eaxamined. GILAN: Deylaman, many specimens, 16.viii.1998; Lashte Nesha, 1 specimen, 31.vii.2002; Rasht, 1 specimen, vi.-viii.1996.
 Comments. In hilly steppes and gardens. On Epilobium. North-Mediterranean, extending to the Middle East and Middle Asia.
description: Published as part of Linnavuori, Rauno E., 2007, Studies on the Piesmatidae, Berytidae, Pyrrhocoridae, Stenocephalidae, Coreidae, Rhopalidae, Alydidae, Cydnidae, and Plataspidae (Heteroptera) of Gilan and the adjacent provinces in northern Iran, pp. 77-91 in Acta Entomologica Musei Nationalis Pragae 47 on page 80, DOI: 10.5281/zenodo.5328527
Restoring the Power and Purpose of HR in Global Corporate Systems
Creators: name: Singh, Megh
Publisher: name: Zenodo
Year: 2025
Subjects: Human Resource Management, Organizational Ethics, Corporate Culture, HR Power, Workplace Structure, Employee Rights, HR Reform

description: This research paper, authored by Megh Singh, critically examines the declining power and structural relevance of Human Resource (HR) departments in global corporate systems. Drawing from the author's lived experiences across training and associate roles, the paper explores how operational dominance often renders HR powerless, leading to favoritism, employee exploitation, and compromised workplace ethics. Through real-world observations and comparative analysis with HR practices in countries like Germany and Canada, the study calls for urgent structural reforms to restore HR's independence. It advocates for HR reporting directly to leadership, stronger hiring standards, legal literacy, and ethical grievance redressal mechanisms. This paper is a heartfelt call to rebuild fair, just, and human-centered organizations where HR is not sidelined but empowered as a strategic guardian of people and culture.
Scaling Behaviour of the Maximal Growth Rate in the Rosensweig Instability
Creators: name: Lange, Adrian
Publisher: name: arXiv
Year: 2001
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The dependence of the maximal growth rate of the modes of the Rosensweig instability on the properties of the magnetic fluid and the external magnetic induction is studied. An expansion and a fit procedure are applied in the appropriate ranges of the supercritical induction $\hat B$. With increasing $\hat B$ the scaling of the maximal growth rate changes from linear to a combination of linear and square-root-like scaling. The scaling of the corresponding wave number alternates from quadratic to primarily linear. For very small $\hat B$ the dependence of the maximal growth rate on the viscosity is given. Suggestions are made for experiments to test the predicted scaling behaviours.
description: 8 pages, 4 figures; to appear in Europhys. Lett
Oreopsyche tenella
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Oreopsyche
Oreopsyche tenella

description: Oreopsyche tenella (SPEYER, 1862)
F u n d n a c h w e i s e:i.A.Säcke 15.07.2005: Bionaz; i.A. Säcke 16.07.2005: Colle del Gran San Bernardo; i.M. Säcke 17.07.2005, 1 e.l. Ende 07.2005: Piamprato, leg. Arnscheid & Weidlich.
P h ä n o l o g i e / H a b i t a t e: Die Imagines erscheinen ab Ende Mai bis in den Juli hinein. Sie leben auf xerothermen Gesteinsfluren bis in Höhen von 2.500 m NN. Aus Italien nur aus den nördlichen Regionen mit den Alpen bekannt (PARENZAN & PORCELLI 2005-2006: 22).
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1926, DOI: 10.5281/zenodo.5286493
Gravitational instability of finite isothermal spheres
Creators: name: Chavanis, P. -H.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate the stability of bounded self-gravitating systems in the canonical ensemble by using a thermodynamical approach. Our study extends the earlier work of Padmanabhan [Astrophys. J. Supp. 71, 651 (1989)] in the microcanonical ensemble. By studying the second variations of the free energy, we find that instability sets in precisely at the point of minimum temperature in agreement with the theorem of Katz [ Mon. Not. R. astr. Soc. 183, 765 (1978)]. The perturbation that induces instability at this point is calculated explicitly; it has not a ``core-halo'' structure contrary to what happens in the microcanonical ensemble. We also study Jeans type gravitational instability of isothermal gaseous spheres described by Navier-Stokes equations. We show analytically the equivalence between dynamical stability and thermodynamical stability and the fact that the stability of isothermal gas spheres does not depend on the viscosity. This confirms the findings of Semelin et al. [astro-ph/9908073] who used numerical methods. We also give a simpler derivation of the geometric hierarchy of scales inducing instability discovered by these authors. The density profiles that trigger these instabilities are calculated analytically; they present more and more oscillations that also follow a geometric progression. This suggests that the system will fragmentate in a series of `clumps' and that these `clumps' will themselves fragmentate in substructures. The fact that both the domain sizes leading to instability and the `clumps' sizes within a box follow a geometric progression with the same ratio suggests a fractal-like behaviour. This gives further support to the interpretation of de Vega et al. [Nature, 383, 56 (1996)].
description: Submitted to Astron. Astrophys
All-optical cryogenic thermometry based on NV centers in nanodiamonds
Creators: name: Fukami, M.
name: Yale, C. G.
name: Andrich, P.
name: Liu, X.
name: Heremans, F. J.
name: Nealey, P. F.
name: Awschalom, D. D.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The nitrogen-vacancy (NV) center in diamond has been recognized as a high-sensitivity nanometer-scale metrology platform. Thermometry has been a recent focus, with attention largely confined to room temperature applications. Thermometry has been a recent focus, with attention largely confined to room temperature applications. Temperature sensing at low temperatures, however, remains challenging as the sensitivity decreases for many commonly used techniques which rely on a temperature dependent frequency shift of the NV centers spin resonance and its control with microwaves. Here we use an alternative approach that does not require microwaves, ratiometric all-optical thermometry, and demonstrate that it may be utilized to liquid nitrogen temperatures without deterioration of the sensitivity. The use of an array of nanodiamonds embedded within a portably polydimethylsiloxane (PDMS) sheet provides a versatile temperature sensing platform that can probe a wide variety of systems without the configurational restrictions needed for applying microwaves. With this device, we observe a temperature gradient over tens of microns in a ferromagnetic-insulator substrate (YIG) under local heating by a resistive heater. This thermometry technique provides a cryogenically compatible, microwave-free, minimally invasive approach capable of probing local temperatures with few restrictions on the substrate materials.
description: 19 pages, 4 figures, and supplemental section
Leptopterix plumistrella
Creators: name: Weidlich, Michael
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Psychidae
Leptopterix
Leptopterix plumistrella

description: Leptopterix plumistrella (HÜBNER, 1793)
F u n d n a c h w e i s e 1 Sack 17.07.2005: Piamprato; i.M. Säcke 19.07.2005: Pordoijoch; i.M. Säcke 20.07.2005: Langkofel, leg. Arnscheid & Weidlich.
P h ä n o l o g i e / H a b i t a t e: Die Imagines fliegen von Mai bis in den Juli je nach Höhenlage und ihre Vorkommen sind auf die Alpen beschränkt. Den Lebensraum bilden hochmontane bis subalpine Wiesen und Geröllfelder.
description: Published as part of Weidlich, Michael, 2015, Beobachtungen zur Psychidenfauna Italiens mit der Neubeschreibung einer Dahlica ENDERLEIN, 1912 (Lepidoptera: Psychidae), pp. 1909-1934 in Linzer biologische Beiträge 47 (2) on page 1926, DOI: 10.5281/zenodo.5286493
Effect of Spin-Flip Scattering on Electrical Transport in Magnetic Tunnel Junctions
Creators: name: Zhu, Zhen-Gang
name: Su, Gang
name: Zheng, Qing-Rong
name: Jin, Biao
Publisher: name: arXiv
Year: 2002
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By means of the nonequilibrium Green function technique, the effect of spin-flip scatterings on the spin-dependent electrical transport in ferromagnet-insulator-ferromagnet (FM-I-FM) tunnel junctions is investigated. It is shown that Julliere's formula for the tunnel conductance must be modified when including the contribution from the spin-flip scatterings. It is found that the spin-flip scatterings could lead to an angular shift of the tunnel conductance, giving rise to the junction resistance not being the largest when the orientations of magnetizations in the two FM electrodes are antiparallel, which may offer an alternative explanation for such a phenomenon observed previously in experiments in some FM-I-FM junctions. The spin-flip assisted tunneling is also observed.
description: Revtex, 4 figures