cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Weiterentwicklung des Kerndatensatz Forschung: Prozesse und Ergebnisse
Creators: name: Biesenbender, Sophie
Publisher: name: Zenodo
Year: 2021
Subjects: Kerndatensatz Forschung
Forschungsberichterstattung
Forschungsinformationssysteme
Forschungsfelder

description: Im Jahr 2020 wurde der Helpdesk zur Einführung des Kerndatensatz Forschung mit der Koordinierung und Gestaltung des Weiterentwicklungsprozesses und der Erarbeitung einer neuen Version (1.2) des Kerndatensatz Forschung beauftragt. Dieser Prozess hat in erster Linie das Ziel, Inkonsistenzen, Fehler und Schwächen der Spezifikation, welche im Rahmen der Implementation identifiziert wurden, zu beheben. In enger Zusammenarbeit mit verschiedenen Gremien und der interessierten Öffentlichkeit und arbeitet der Helpdesk seither an der Aktualisierung der Spezifikation und ihrer Dokumentation, welche im Frühjahr 2021 veröffentlicht werden soll. Der Vortrag skizziert den Prozess der Aktualisierung und gibt einen Überblick über die wesentlichen Inhalte der Weiterentwicklung.
Should retirement be compulsory or vouluntary? : an overview of the attitudes, practices, and arguments related to mandatory retirement
Creators: name: Hluchy, Cathy Marie
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is concerned with the potential social consequences of a changed policy on mandatory retirement. The provision in the Canadian Charter of Rights and Freedoms for the abolition of age discrimination, as well as an indication of the Government of Canada that it intends to pass legislation banning compulsory retirement, necessitate that the implications of an end to fixed-age retirement be explored. Social consequences were considered by reviewing attitudes toward retirement, practices of retirement, and the arguments for and against mandatory retirement Concerning attitudes toward retirement and socioeconomic status, it was found that those who want to work beyond the normal age of retirement have higher education levels and typically work in professional, executive, and white collar jobs. For gender, it was revealed that women have less favourable attitudes toward retirement than men. With respect to practices of retirement, those who retire later than the normal age of retirement tend to be of higher socioeconomic status, male, and among women, single as opposed to married. After reviewing the arguments for and against mandatory retirement, it was concluded that ending forced retirement would not be detrimental to any social group in Canada but rather, would benefit those who wish to work beyond age 65 in order to secure an adequate income or to continue a satisfying career. Abolishing fixed-age retirement would mean an end to discrimination based on age and an affirmation of individual rights.
Towards Efficient Local Causal Structure Learning
Creators: name: Yang, Shuai
name: Wang, Hao
name: Yu, Kui
name: Cao, Fuyuan
name: Wu, Xindong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Local causal structure learning aims to discover and distinguish direct causes (parents) and direct effects (children) of a variable of interest from data. While emerging successes have been made, existing methods need to search a large space to distinguish direct causes from direct effects of a target variable T. To tackle this issue, we propose a novel Efficient Local Causal Structure learning algorithm, named ELCS. Specifically, we first propose the concept of N-structures, then design an efficient Markov Blanket (MB) discovery subroutine to integrate MB learning with N-structures to learn the MB of T and simultaneously distinguish direct causes from direct effects of T. With the proposed MB subroutine, ELCS starts from the target variable, sequentially finds MBs of variables connected to the target variable and simultaneously constructs local causal structures over MBs until the direct causes and direct effects of the target variable have been distinguished. Using eight Bayesian networks the extensive experiments have validated that ELCS achieves better accuracy and efficiency than the state-of-the-art algorithms.
description: Published on IEEE Transactions on Big Data (TBD). arXiv admin note: text overlap with arXiv:1910.01288
Higgs Boson Mass, Sparticle Spectrum and Little Hierarchy Problem in Extended MSSM
Creators: name: Babu, K. S.
name: Gogoladze, Ilia
name: Rehman, Mansoor Ur
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the impact of TeV-scale matter belonging to complete vectorlike multiplets of unified groups on the lightest Higgs boson in the MSSM. We find that consistent with perturbative unification and electroweak precision data the mass m_h can be as large as 160 GeV. These extended MSSM models can also render the little hierarchy problem less severe, but only for lower values of m_h < 125 GeV. We present estimates for the sparticle mass spectrum in these models.
description: 27 pages, 14 figures
Getreideabfuhr bei Großmähdreschern
Creators: name: Winter, Kai
Publisher: name: LANDTECHNIK
Year: 1997

description: ln flächenreichen Betrieben werden oft mehrere Großmähdrescher zusammen auf einem Schlag eingesetzt. Durch die hohen Leistungen der Maschinen fallen in kurzer Zeit große Erntemengen an, die meist über weitere Entfernungen transportiert werden müssen. Die Getreideabfuhr stellt in Großbetrieben hohe Anforderungen an die Transportlogistik. Deshalb sind geeignete Transportkonzepte nötig.
description: LANDTECHNIK, Bd. 52 Nr. 5 (1997)
Are all Boer-Mulders functions alike?
Creators: name: Burkardt, Matthias
name: Hannafious, Brian
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Chirally odd generalized parton distributions (GPDs) and the Boer-Mulders function provide valuable information about spin-orbit correlations for quarks in nucleons and other hadrons. We compare results for the relevant GPD $\bar{E}^q_T$ from a variety of phenomenological models as well as recent lattice results. We find that $\bar{E}^q_T>0$ for nucleons as well as the pion and for both $u$ and $d$ quark. As a result, the corresponding Boer Mulders functions are all expected to be negative. The sign of $\bar{E}^q_T$ arises from the relative sign between the upper and lower Dirac components for the quark wave functions.
description: 8 pages, 1 figure
Reporting mit Vitro Query Tool
Creators: name: Kampe, Benjamin
name: Schnieders, Kathrin
name: Triggs, Graham
name: Walther, Tatiana
Publisher: name: Zenodo
Year: 2021
Subjects: Reporting
Vitro Query Tool
VIVO
vivo-de2021

description: Jährlich wiederkehrende Berichtspflichten über den Ursprung und die Verwendung von Drittmitteln ist seit einiger Zeit selbstverständliche Tätigkeit von wissenschaftlichen Einrichtungen. Eng damit verwandt ist die Dokumentation von Aktivitäten für Evaluationszwecke. Da diese Berichterstattung oftmals sehr aufwändig ist, besteht der Wunsch, vorhandene Daten so gut wie möglich so zu erfassen, dass Berichtspflichten mit möglichst wenig Aufwand erledigt werden können. Mit dem Vitro Query Tool soll eine Alternative zu den in VIVO bereits bestehenden Reporting-Komponenten geschaffen werden, die sowohl Nutzer- als auch Anwendungsfreundlich ist. In diesem Beitrag wird die Berichterstattung mithilfe von Vitro Query Tool vorgestellt. Es wird auf die einzelnen Bestandteile eines Berichtes: Data Distributoren und Templates eingegangen. Anschließend wird ein Bericht in Echtzeit konfiguriert und generiert.
Are the renormalized band widths in TTF-TCNQ of structural or electronic origin? - An angular dependent NEXAFS study
Creators: name: Sing, M.
name: Meyer, J.
name: Hoinkis, M.
name: Glawion, S.
name: Blaha, P.
name: Gavrila, G.
name: Jacobsen, C. S.
name: Claessen, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have performed angle-dependent near-edge x-ray absorption fine structure measurements in the Auger electron yield mode on the correlated quasi-one-dimensional organic conductor TTF-TCNQ in order to determine the orientation of the molecules in the topmost surface layer. We find that the tilt angles of the molecules with respect to the one-dimensional axis are essentially the same as in the bulk. Thus we can rule out surface relaxation as the origin of the renormalized band widths which were inferred from the analysis of photoemission data within the one-dimensional Hubbard model. Thereby recent theoretical results are corroborated which invoke long-range Coulomb repulsion as alternative explanation to understand the spectral dispersions of TTF-TCNQ quantitatively within an extended Hubbard model.
description: 6 pages, 5 figures
Logistik in der Landwirtschaft
Creators: name: Fürll, Christian
name: Hahn, Jürgen
Publisher: name: LANDTECHNIK
Year: 1997

description: Wie in vielen anderen Zweigen der Wirtschaft kann die Anwendung der Logistik auch in der Landwirtschaft die Effizienz steigern. Zielstellung ist das Optimieren aller Material, Waren und Informationsflüsse von der Beschaffung der Rohstoffe bis hin zur Vermarktung. Synergieeffekte werden durch eine ganzheitliche systematische Betrachtung aller Prozesse erschlossen. Logistische Aufgabenstellungen müssen am Beginn ihrer Bearbeitung gründlich analysiert und in Kooperation mit anderen Basiswissenschaften zu neuen Verfahrensideen entwickelt werden. Varianten und Zwischenergebnisse sind immer wieder zu bewerten und zu präzisieren. Für das Optimieren typischer Aufgabenstellungen können Methoden der Operationsforschung angewendet werden.
description: LANDTECHNIK, Bd. 52 Nr. 5 (1997)
Spin-state transition and spin-polaron physics in cobalt oxide perovskites: ab initio approach based on quantum chemical methods
Creators: name: Hozoi, L.
name: Birkenheuer, U.
name: Stoll, H.
name: Fulde, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A fully ab initio scheme based on quantum chemical wavefunction methods is used to investigate the correlated multiorbital electronic structure of a 3d-metal compound, LaCoO3. The strong short-range electron correlations, involving both Co and O orbitals, are treated by multireference techniques. The use of effective parameters like the Hubbard U and interorbital U', J terms and the problems associated with their explicit calculation are avoided with this approach. We provide new insight into the spin-state transition at about 90 K and the nature of charge carriers in the doped material. Our results indicate the formation of a t4e2 high-spin state in LaCoO3 for T>90 K. Additionally, we explain the paramagnetic phase in the low-temperature lightly doped compound through the formation of Zhang-Rice-like O hole states and ferromagnetic clusters.
Fermionic realization of toroidal Lie algebras of classical types
Creators: name: Jing, Naihuan
name: Misra, Kailash C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B65, 17B69, 81Rxx

description: We use fermionic operators to construct toroidal Lie algebras of classical types, including in particular that of symplectic affine algebras, which is first realized by fermions.
description: Updated version to include new fermionic construction for symplectic types
Markaziy osiyo xalqlarida islom dinini kirib kelishing ma'naviy axloqiy  jihatlari
Creators: name: S.O.Ibragimov, TATU Samarqand filiali  Telekomunikatsiya texnologiyalari va kasb ta'lim fakulteti TT 23-05 guruh talabasi
name: Ilmiy rahbar: X.U.Samatov
Publisher: name: Zenodo
Year: 2023

description: ushbu  maqolada   islom  dinining  Markaziy  Osiyo  bo’ylab  tarqalishi hamda islom dini haqida umumiy tushunchalar hamda ma’lumotlar bayon etilgan.
АМЕНОРЕЯ ПРИ НЕРВНОЙ АНОРЕКСИИ
Creators: name: Абдуллаева, Нина
Publisher: name: Zenodo
Year: 2024

description: В данной статье рассматриваются нервная анорексия и аменорея, взаимосвязь между симптомами и влияние на жизнь человека, фертильность и репродуктивные проблемы, гормональный дисбаланс, сердечные осложнения.
Quantum Error Correction of Observables
Creators: name: Beny, Cedric
name: Kempf, Achim
name: Kribs, David W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A formalism for quantum error correction based on operator algebras was introduced in [1] via consideration of the Heisenberg picture for quantum dynamics. The resulting theory allows for the correction of hybrid quantum-classical information and does not require an encoded state to be entirely in one of the corresponding subspaces or subsystems. Here, we provide detailed proofs for the results of [1], derive a number of new results, and we elucidate key points with expanded discussions. We also present several examples and indicate how the theory can be extended to operator spaces and general positive operator-valued measures.
description: 22 pages, 1 figure, preprint version
CUORE UNIVENTRICOLARE E FLUSSO ANTEROGRADO:
OUTCOME DEI PAZIENTI SOTTOPOSTI AD INTERVENTO PALLIATIVO DI GLENN BIDIREZIONALE
Creators: name: D'Andrea, Claudia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Introduzione:Negli ultimi cinquanta anni vi sono state notevoli innovazioni e miglioramenti nelle tecniche cardiochirurgiche nell’ambito delle cardiopatie congenite. Cio’ che è risultato essere un’idea vincente per quel che concerne i cuori anatomicamente o funzionamente univentricolari è stata quella di affrontare gli interventi palliativi basandosi sulla tecnica della palliazione a stadi. Il secondo stadio di palliazione è rappresentato dall’intervento di anastomosi cavo polmonare bidirezionale (BCPA), ovvero, dopo aver bilancito i flussi sistemico e polmonare con le tecniche di palli azione neonatale, il secondo obiettivo è separare parzialmente la circolazione polmonare da quella sistemica. Da diversi anni si sta valutando il ruolo del flusso accessorio nell'ambito della BCPA.
Scopo dello studio: comparare l’outcome a breve, medio e lungo termine dei pazienti sottoposti ad intervento di Glenn bidirezionale senza e con flusso accessorio.
Rsultati:La presenza di un flusso accessorio non comporta un incremento di rischio di mortalità e morbilità ne’ l’aumento dei tempi di recupero post-operatori; i dati dello studio mostrano che il flusso accessorio comporta dei vantaggi in termini di saturazione di Ossigeno, prevenzione delle fistole arterovenose polmonari, crescita delle arterie polmonari e prolungamento del tempo “libero da Fontan”.
Conclusioni:L’anastomosi cavo polmonare bidirezionale rappresenta uno stadio intermedio fondamentale nell’iter chirurgico palliativo dei pazienti affetti da cuore uni ventricolare  e si conferma un intervento a ridotta mortalità e morbilità. La presenza di un flusso accessorio comporta notevoli vantaggi, tuttavia questi dati, per quanto forniscano indicazioni interessanti,  vanno confermati da studi possibilmente multicentrici ed  i reali vantaggi sono ancora tutti da dimostrare
The description of giant dipole resonance key parameters with multitask neural networks
Creators: name: Bai, J. H.
name: Niu, Z. M.
name: Sun, B. Y.
name: Niu, Y. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences
subject: I.2.6; J.2
subject: 81V35, 82D75, 68T07

description: Giant dipole resonance (GDR) is one of the fundamental collective excitation modes in nucleus. Continuous efforts have been made to the evaluation of GDR key parameters in different nuclear data libraries. We introduced multitask learning (MTL) approach to learn and reproduce the evaluated experimental data of GDR key parameters, including both GDR energies and widths. Compared to the theoretical GDR parameters in RIPL-3 library, the accuracies of MTL approach are almost doubled for 129 nuclei with experimental data. The significant improvement is largely due to the right classification of unimodal nuclei and bimodal nuclei by the classification neural network. Based on the good performance of the neural network approach, an extrapolation to 79 nuclei around the $β$-stability line without experimental data is made, which provides an important reference to future experiments and data evaluations. The successful application of MTL approach in this work further proofs the feasibility of studying multi-output physical problems with multitask neural network in nuclear physics domain.
description: 9 pages, 6 figures
Quantum-well tunneling anisotropic magnetoresistance above room temperature
Creators: name: Al-Mahdawi, Muftah
name: Xiang, Qingyi
name: Miura, Yoshio
name: Belmoubarik, Mohamed
name: Masuda, Keisuke
name: Kasai, Shinya
name: Sukegawa, Hiroaki
name: Mitani, Seiji
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum-well (QW) devices have been extensively investigated in semiconductor structures. More recently, spin-polarized QWs were integrated into magnetic tunnel junctions (MTJs). In this work, we demonstrate the spin-based control of the quantized states in iron $3d$-band QWs, as observed in experiments and theoretical calculations. We find that the magnetization rotation in the Fe QWs significantly shifts the QW quantization levels, which modulate the resonant-tunneling current in MTJs, resulting in a tunneling anisotropic magnetoresistance (TAMR) effect of QWs. This QW-TAMR effect is sizable compared to other types of TAMR effect, and it is present above the room-temperature. In a QW MTJ of Cr/Fe/MgAl$_2$O$_4$/top electrode, where the QW is formed by a mismatch between Cr and Fe in the $d$ band with $Δ_1$ symmetry, a QW-TAMR ratio of up to 5.4 % was observed at 5 K, which persisted to 1.2 % even at 380K. The magnetic control of QW transport can open new applications for spin-coupled optoelectronic devices, ultra-thin sensors, and memories.
East Hampton Business Directory Map, 1858
Creators: name: Chase, J.
name: Douglas, John
Publisher: name: Unknown
Year: 0
Subjects: East Hampton
Main Street
Business districts
Maps
Map making

description: This images shows a map of the East Hampton Village Business district made in 1858 by J. Chase Jr. and John Douglas. This image is courtesy of the Suffolk County Historical Society and this reproduction was collected sometime from 1970 to 1982 as part of the East Hampton’s Heritage Photo Collection.
description: Images within East Hampton Heritage Photo Collection seem to have been taken or collected in relation to the East Hampton Heritage project, but not all of them were included in the final publication. Several photographer are included in this collection.
Assetto endocrino - metabolico, profilo bioumorale e valutazione cardiovascolare in cani affetti da obesità
Creators: name: Morgia, Rosa
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Obesity is the most common form of malnutrition occurring in dog; it have an prevalence estimated between 24 % and 44 %, with a range of age between 5 and 10 years. Health risks associated with obesity in dogs are similar to those occurring in humans, and include various disease as well as compromised immune function.
The aim of this study is to evaluate and correlate the cytokine network, cardiovascular parameters, metabolic panel, morphometric measurements, fat measurement obtained with radiology, ultrasound and impedenziometric assessment in obese dogs, in order to develop new tools to determine the overweight status in this species.
This study was carried out between january 2011 and december 2012 and 175 dogs have been enrolled. 40 dogs of them were selected and divided in 21 (group obese -ob) and 19 animals (controls group -np); on each animal a biochemical panel, complete blood cell count, blood gas analysis, ultrasound and x-ray of lumbar and sacral spine (L6- S1), ECG, echocardiography, leptin, adiponectin, TNF-alpha and IL-6, morphometric measurements and bioelectrical impedance were performed. A brief questionnaire about diet was obtained by owners of the 40 dogs.
The result of this study demonstrate that on the dogs enrolled the modification endocrine-metabolic are similar to that reported in human medicine as regards the values of adipokines, which have proved to be excellent indicators of obesity in dogs. Among the techniques objective evaluation of the degree of lipid infiltration, the radiological seems to be able to provide the best results. It hoped that as well as bioelectrical impedenziometria althought future studies are necessary to confirm the usefulness of this last diagnostic method.
Random walks on complex networks with multiple resetting nodes: a renewal approach
Creators: name: Wang, Shuang
name: Chen, Hanshuang
name: Huang, Feng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Due to wide applications in diverse fields, random walks subject to stochastic resetting have attracted considerable attention in the last decade. In this paper, we study discrete-time random walks on complex network with multiple resetting nodes. Using a renewal approach, we derive exact expressions of the occupation probability of the walker in each node and mean-field first-passage time between arbitrary two nodes. All the results are relevant to the spectral properties of the transition matrix in the absence of resetting. We demonstrate our results on circular networks, stochastic block models, and Barabási-Albert scale-free networks, and find the advantage of the resetting processes to multiple resetting nodes in global searching on such networks.
description: 11 pages, 4 figures
3rd Workshop on Hybrid Development Approaches in Software System Development
Creators: name: Tell, Paolo
name: MacDonell, Stephen
name: Licorish, Sherlock A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Evidence shows that software development methods, frameworks, and even practices are seldom applied in companies by following the book. Combinations of different methodologies into home-grown processes are being constantly uncovered. Nonetheless, an academic understanding and investigation of this phenomenon is very limited. In 2016, the HELENA initiative was launched to research hybrid development approaches in software system development. This paper introduces the 3rd HELENA workshop and provides a detailed description of the instrument used and the available data sets.
description: Article/Book Chapter, 5 pages, 1 figure, 2 tables
NEW POSSIBLE APPLICATIONS FOR APTAMERS IN TARGETED ANTI-CANCER THERAPIES
Creators: name: Iaboni, Margherita
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: In order of reducing the frequency of unwanted side effects and recurrences, in the last ten years a major challenge has been the development of methods for the specific targeting to cancer cells. Aptamers are single-stranded RNAs able to form different three-dimensional structures, which allows them to specifically recognize their molecular targets. This makes aptamers attractive agents for targeted cancer therapy. Aptamers were first utilized for their ability to bind and inhibit the activity of their target protein, including extracellular ligands and cell surface proteins. More recently, aptamers were are also used as delivery agents. Thanks to their ability to be endocytosed, aptamers may specifically bring a therapeutic cargo inside the cells.
In this thesis, I developed several aspects regarding the aptamer-mediated targeting of cancer cells: 1) the selection of aptamers for a cancer stem cells-targeted therapy. In fact, as widely recognized, cancer stem cells are responsible for tumor recurrence, repopulating the tumor after a chemotherapeutic treatment. 2) The formation of an aptamer-microRNA chimera molecule in which the aptamer is the delivery vehicle for a microRNA. The use of microRNAs represent a challenging approach in cancer therapy because they are able to regulate the expression of cellular proteins modulating different pathways. However, to date the absence of reliable means that permit the specific delivery of microRNAs to the appropriate tissue represents an obstacle to the success of this approach.
For the first purpose, I performed for the first time a SELEX (Systematic Evolution of Ligands by EXponential enrichment) method on human breast cancer stem cells, using in the counterselection step breast cancer differentiated cells. I selected putative aptamers specific for the stemness phenotype in breast cancer, useful to 1) identify specific cell-surface targets, 2) block molecular pathways and 3) specifically delivery therapeutics. For the second purpose, I selected an internalizing aptamer, GL21, that specifically binds to Axl receptor, overexpressed in many types of cancer cells. I linked this aptamer to miR-212. This microRNA is considered a tumour-suppressor miR because negatively regulates the anti-apoptotic protein PED found overexpressed in many tumors and involved in resistance to therapeutics. In A549 cells, TRAIL- resistant non-small cell lung cancer cells overexpressing Axl, this chimera was able to enter within and carry the microRNA to the processing machinery. MiR-212, subsequently, targeted PED resulting in TRAIL sensitization.
In conclusion, in this thesis I studied new possible applications for aptamers aimed at avoiding therapeutic recurrences and at delivering “therapeutic” RNAs, as microRNAs, to the appropriate cells.
Dynamics of Colombo's Top: Tidal Dissipation and Resonance Capture, With Applications to Oblique Super-Earths, Ultra-Short-Period Planets and Inspiraling Hot Jupiters
Creators: name: Su, Yubo
name: Lai, Dong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a comprehensive theoretical study on the spin evolution of a planet under the combined effects of tidal dissipation and gravitational perturbation from an external companion. Such a "spin + companion" system (called Colombo's top) appears in many [exo]planetary contexts. The competition between the tidal torque (which drives spin-orbit alignment and synchronization) and the gravitational torque from the companion (which drives orbital precession of the planet) gives rise to two possible spin equilibria ("Tidal Cassini Equilibria", tCE) that are stable and attracting: the "simple" tCE1, which typically has a low spin obliquity, and the "resonant" tCE2, which can have a significant obliquity. The latter arises from a spin-orbit resonance and can be broken when the tidal alignment torque is stronger than the precessional torque from the companion. We characterize the long-term evolution of the planetary spin (both magnitude and obliquity) for an arbitrary initial spin orientation, and develop a new theoretical method to analytically obtain the probability of resonance capture driven by tidal dissipation. Applying our general theoretical results to exoplanetary systems, we find that a super-Earth (SE) with an exterior companion can have a substantial probability of being trapped in the high-obliquity tCE2, assuming that SEs have a wide range of primordial obliquities. We also evaluate the recently proposed "obliquity tide" scenarios for the formation of ultra-short-period Earth-mass planets and for the orbital decay of hot Jupiter WASP-12b. We find in both cases that the probability of resonant capture into tCE2 is generally low and that such a high-obliquity state can be easily broken by the required orbital decay.
description: 21 pages, 24 figures, accepted to MNRAS
L'ontologia arcaica nel pensiero di Mircea Eliade
Creators: name: Vosa, Filippo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Lo studio delle religioni arcaiche nelle opere eliadiane, con particolare riferimento al tema dell'abolizione del tempo e del ritorno all'origine attraverso le reiterazione rituale del modello mitico, in connessione con la crisi spirituale della civiltà occidentale e con le correnti filosofiche irrazionalistiche della prima metà del Novecento.
Partial regularity for local minimizers of variational integrals with lower order terms
Creators: name: Cordero, Judith Campos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B65, 35J50, 35J60, 49N99

description: We consider functionals of the form $$\mathcal{F}(u):=\int_Ω\!F(x,u,\nabla u)\,\mathrm{d} x,$$ where $Ω\subseteq\mathbb{R}^n$ is open and bounded. The integrand $F\colonΩ\times\mathbb{R}^N\times\mathbb{R}^{N\times n}\to\mathbb{R}$ is assumed to satisfy the classical assumptions of a power $p$-growth and the corresponding strong quasiconvexity. In addition, $F$ is Hölder continuous with exponent $2β\in(0,1)$ in its first two variables uniformly with respect to the third variable, and bounded below by a quasiconvex function depending only on $z\in\mathbb{R}^{N\times n}$. We establish that strong local minimizers of $\mathcal{F}$ are of class $\mathrm{C}^{1,β}$ in an open subset $Ω_0\subseteqΩ$ with $\mathcal{L}^n(Ω\setminusΩ_0)=0$. This partial regularity also holds for a certain class of weak local minimizers at which the second variation is strongly positive and satisfying a $\mathrm{BMO}$-smallness condition. This extends the partial regularity result for local minimizers by Kristensen and Taheri (2003) to the case where the integrand depends also on $u$. Furthermore, we provide a direct strategy for this result, in contrast to the blow-up argument used for the case of homogeneous integrands.
description: 35 pp
Effect of symmetrical frequency chirp on pair production
Creators: name: Wang, Kun
name: Hu, Xuehua
name: Dulat, Sayipjamal
name: Xie, B. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain Momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of number density is also remarkable compared to the case of asymmetrical frequency chirp. Note that the dynamically assisted Schwinger Mechanism plays an important role for the enhanced pair production in the symmetrical frequency chirp.
description: 21 pages, 9 figures
EXPLORING BLOCKCHAIN'S POTENTIAL IN SUPPLY CHAINS, FINANCE, AND DATA SECURITY: OPPORTUNITIES AND CHALLENGES IN BUSINESS
Creators: name: Mbonigaba Celestin*, S. Sujatha**, A. Dinesh Kumar*** & M. Vasuki****
Publisher: name: Zenodo
Year: 2024

description: Blockchain technology offers a transformative potential across various business sectors, particularly in enhancing transparency, efficiency, and security. The objective of this study was to evaluate the opportunities and challenges associated with blockchain adoption in supply chain management, financial transactions, and data security. Using a qualitative methodology, the research analyzed case studies and industry reports. Results showed that blockchain improved transparency in supply chains by 70% and reduced counterfeit products by 30%. Additionally, blockchain reduced cross-border payment times by over 90% and transaction fraud in the financial sector by 45%. However, scalability and regulatory uncertainty remain significant barriers, with 65% of businesses citing these as major concerns. In conclusion, while blockchain presents substantial benefits, its broader adoption is constrained by technical and regulatory challenges.
Deep Chaos Synchronization
Creators: name: Mobini, Majid
name: Kaddoum, Georges
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this study, we address the problem of chaotic synchronization over a noisy channel by introducing a novel Deep Chaos Synchronization (DCS) system using a Convolutional Neural Network (CNN). Conventional Deep Learning (DL) based communication strategies are extremely powerful but training on large data sets is usually a difficult and time-consuming procedure. To tackle this challenge, DCS does not require prior information or large data sets. In addition, we provide a novel Recurrent Neural Network (RNN)-based chaotic synchronization system for comparative analysis. The results show that the proposed DCS architecture is competitive with RNN-based synchronization in terms of robustness against noise, convergence, and training. Hence, with these features, the DCS scheme will open the door for a new class of modulator schemes and meet the robustness against noise, convergence, and training requirements of the Ultra Reliable Low Latency Communications (URLLC) and Industrial Internet of Things (IIoT).
Some privacy-preserving methods for health research involving disaggregate geographic data about individuals
Creators: name: Kamel-Boulos, MN
Publisher: name: figshare
Year: 2021
Subjects: subject: 111711 Health Information Systems (incl. Surveillance)
subject: FOS: Health sciences
subject: 111706 Epidemiology
subject: 111799 Public Health and Health Services not elsewhere classified
subject: 80702 Health Informatics
subject: FOS: Media and communications

description: Invited presentation at the AAG (American Association of Geographers) GEOEthics webinar entitled 'Ethical Issues of Using Geospatial Data in Health Research or Policies During the COVID-19 Pandemic and Beyond' on Thursday, December 2, 2021 9:00 am - 11:00 am U.S. Eastern Time. Co-organised by the Institute of Space and Earth Information Science at the Chinese University of Hong Kong and the Center for Spatial Studies at University of California, Santa Barbara, with support from ESRI (https://aag-geoethics-series.secure-platform.com/a/solicitations/10/sessiongallery/200 ).
Higher-order, quantum magnetic inductions in chiral topological materials
Creators: name: Liu, Yizhou
name: Tan, Hengxin
name: Yan, Binghai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The classic magnetic induction effect is usually considered in electric circuits or conductor coils. In this work, we propose quantum induction effects induced by the Berry curvature in homogenous solids. Two different types of quantum inductions are identified in the higher order of a magnetic field. They are closely related to the magnetic-field-induced anomalous velocity proportional to the Berry curvature so that both quantum inductions become significantly enhanced near Weyl points. Further, we propose an ac-magnetic-field measurement to detect quantum induction effects and distinguish them from classical induction.
description: 5 pages, 3 figures
Interplay between electron-phonon and Coulomb interactions in cuprates
Creators: name: Gunnarsson, O.
name: Rösch, O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Evidence for strong electron-phonon coupling in high-Tc cuprates is reviewed, with emphasis on the electron and phonon spectral functions. Effects due to the interplay between the Coulomb and electron-phonon interactions are studied. For weakly doped cuprates, the phonon self-energy is strongly reduced due to correlation effects, while there is no corresponding strong reduction for the electron self-energy. Polaron formation is studied, focusing on effects of Coulomb interaction and antiferromagnetic correlations. It is argued that experimental indications of polaron formation in undoped cuprates are due to a strong electron-phonon interaction for these systems.
description: 43 pages and 22 figures
A single pulse study of a millisecond pulsar PSR J0621+1002
Creators: name: Wang, S. Q.
name: Wang, J. B.
name: Wang, N.
name: Feng, Y.
name: Zhang, S. B.
name: Lee, K. J.
name: Li, D.
name: Lu, J. G.
name: Xie, J. T.
name: Zhou, D. J.
name: Zhang, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present radio observation of a millisecond pulsar PSR J0621+1002 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulsar shows periodic pulse intensity modulations for both the first and the third pulse components. The fluctuation spectrum of the first pulse component has one peak of 3.0$\pm$0.1 pulse periods, while that of the third pulse component has two diffused peaks of 3.0$\pm$0.1 and 200$\pm$1 pulse periods. The single pulse timing analysis is carried out for this pulsar and the single pulses can be divided into two classes based on the post-fit timing residuals. We examined the achievable timing precision using only the pulses in one class or bright pulses. However, the timing precision improvement is not achievable.
description: accepted for publication in ApJ. 7 pages, 8 figures
Characterization of a Two-Photon Quantum Battery: Initial Conditions, Stability and Work Extraction
Creators: name: Delmonte, Anna
name: Crescente, Alba
name: Carrega, Matteo
name: Ferraro, Dario
name: Sassetti, Maura
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a quantum battery that is based on a two-level system coupled with a cavity radiation by means of a two-photon interaction. Various figures of merit, such as stored energy, average charging power, energy fluctuations, and extractable work are investigated, considering, as possible initial conditions for the cavity, a Fock state, a coherent state, and a squeezed state. We show that the first state leads to better performances for the battery. However, a coherent state with the same average number of photons, even if it is affected by stronger fluctuations in the stored energy, results in quite interesting performance, in particular since it allows for almost completely extracting the stored energy as usable work at short enough times.
description: 15 pages, 7 figures
Relations between strong decay widths of the $P_c$ pentaquarks in the SU(4) flavor-spin model
Creators: name: Stancu, Fl.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In a previous work we have studied the isospin 1/2 lowest positive and negative parity states of the pentaquark $uudc\overline{c}$, in a constituent quark model with a linear confinement and an SU(4) flavor-spin hyperfine interaction and we compared the results with the $P^+_c(4312)$, $P^+_c(4440)$ and $P^+_c(4457)$ pentaquarks observed at LHCb in 2019. Here we extend the previous work by calculating ratios of decay rates of the $P_c$ pentaquarks to $J/Ψ$ and $η_c$ and similarly the ratio of decay rates to $Λ_c {\bar D}^*$ and $Λ_c \bar D$. Our predictions are based on the SU(4)$\times$SU(2) structure of compact pentaquarks.
description: 16 pages, minor changes, it matches the published version
Spezialisten oder Alleskönner
Creators: name: Demmel, Markus
name: Auernhammer, Hermann
Publisher: name: LANDTECHNIK
Year: 1997

description: Ausgehend von veränderten Rahmenbedingungen für den Einsatz von Traktoren wurden Anforderungen an Traktorkonzepte für Pflege und Verteilarbeiten abgeleitet. Aus den Daten einer Einsatzumfrage wurden die spezielle Traktorverwendung und die Geräteparameter ermittelt. Sie dienten der Aufstellung einer Anforderungsliste. Darauf aufbauend wurden in einer Modellbetrachtung alternative Traktormodelle definiert und hinsichtlich der Erfüllung der Anforderungen nutzwertanalytisch beurteilt. Es zeigte sich, dass Trägerfahrzeuge gegenüber Standard und Systemtraktoren deutliche Vorteile aufweisen. Modellkalkulationen zum Einsatz spezialisierter Traktorkonzepte für Pflege und Verteilarbeiten schlossen die Arbeit ab.
description: LANDTECHNIK, Bd. 52 Nr. 5 (1997)
Higher-spin dynamics and Chern-Simons theories
Creators: name: Engquist, Johan
name: Hohm, Olaf
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the construction of consistent higher-spin theories based on Chern-Simons actions. To this end we first introduce the required higher-spin algebras and discuss curvature and torsion tensors in an unconstrained way. Finally we perform a perturbative analysis of the Chern-Simons theory in D=5 for a non-maximally symmetric AdS(4) background and obtain the required four-dimensional Fronsdal equations in the compensator formulation.
description: 8 pages, Contribution to RTN Workshop "ForcesUniverse", Valencia, October 2007
Fundamental Limit on Angular Measurements and Rotations from Quantum Mechanics and General Relativity
Creators: name: Calmet, Xavier
name: Hsu, Stephen D. H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the precision of an angular measurement or rotation (e.g., on the orientation of a qubit or spin state) is limited by fundamental constraints arising from quantum mechanics and general relativity (gravitational collapse). The limiting precision is $r^{-1}$ in Planck units, where $r$ is the physical extent of the (possibly macroscopic) device used to manipulate the spin state. This fundamental limitation means that spin states $S_1$ and $S_2$ cannot be experimentally distinguished from each other if they differ by a sufficiently small rotation. Experiments cannot exclude the possibility that the space of quantum state vectors (i.e., Hilbert space) is fundamentally discrete, rather than continuous. We discuss the implications for finitism: does physics require infinity or a continuum?
description: 10 pages. Version to appear in Physics Letters B
ML 200 kontra Lastschaltgetriebe
Creators: name: Lober, Manfred
Publisher: name: LANDTECHNIK
Year: 1997

description: Im Rahmen eines OECD-Testes bei der DLG-Prüfstelle für Landmaschinen in Groß Umstadt wurde der Fendt Vario 926 eingehend untersucht. Besonderes Interesse galt dabei den Wirkungsgraden von völlig stufenlosen Getrieben, wie dem im Vario 926 (Marschall Leistungsverzweigung ML 200), im Vergleich zu Wirkungsgraden üblicher Lastschaltgetriebe vergleichbarer Traktoren.
description: LANDTECHNIK, Bd. 52 Nr. 5 (1997)
Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions
Creators: name: Bhowmick, Dhiman
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The study of topological magnetic excitations has attracted widespread attention in the past few years. In this thesis, I have studied some examples of novel topological magnonic phases/phenomena in low-dimensional quantum magnets. The first chapter motivates the research based on the research gap in this field of study. The second chapter is written to make the thesis self-sufficient and the concepts are explained through examples. In the second chapter, the following formalisms and physical observables are described: Holstein-Primakoff, bond operator, Schwinger boson, Bogoliubov-Valatin, Group theory, Berry-phase, Berry-curvature, Chern number, thermal Hall conductance, Nernst conductivity, dynamical spin structure factor, edge-current. The main results of the thesis are shown in the third, fourth, and fifth chapters. In the third chapter, I have shown that anti-chiral edge states (co-propagating edge states) arise in the ferromagnetic Heisenberg model on the honeycomb lattice with Dzyaloshinskii-Moriya (DM) interactions. My results suggest that such anti-chiral edge states may be induced in certain realistic models of quantum magnets. In the fourth chapter, I have found the emergence of many magnon band-topological phases in the flux state of the Shastry-Sutherland model. I have derived a simple analytical form of the temperature dependence of derivative of thermal Hall conductivity near the band topological transition point which I propose to be experimentally useful. In the fifth chapter, I have investigated the emergence of Weyl triplons due to inter-layer DM-interaction in a microscopic model of SrCu2(BO3)2, a widely studied frustrated quantum magnet. I have shown that the thermal magnon Hall conductivity has a quasi-linear dependence as a function of the magnetic field in a Weyl-triplon region.
description: PhD thesis, Nanyang Technological University (2020)
Can black holes be torn up by phantom dark energy in cyclic cosmology?
Creators: name: Zhang, Xin
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Infinitely cyclic cosmology is often frustrated by the black hole problem. It has been speculated that this obstacle in cyclic cosmology can be removed by taking into account a peculiar cyclic model derived from loop quantum cosmology or the braneworld scenario, in which phantom dark energy plays a crucial role. In this peculiar cyclic model, the mechanism of solving the black hole problem is through tearing up black holes by phantom. However, using the theory of fluid accretion onto black holes, we show in this paper that there exists another possibility: that black holes cannot be torn up by phantom in this cyclic model. We discussed this possibility and showed that the masses of black holes might first decrease and then increase, through phantom accretion onto black holes in the expanding stage of the cyclic universe.
description: 6 pages, 2 figures; discussions added
Geruchsemissionen aus der landwirtschaftlichen Tierhaltung
Creators: name: Martinec, Milos
name: Hartung, Eberhard
name: Jungbluth, Thomas
Publisher: name: LANDTECHNIK
Year: 1998

description: Um eine in der Praxis nutzbare Datenbasis zu Geruchsemissionen aus der landwirtschaftlichen Tierhaltung zusammenzustellen, wurde eine Literaturstudie durchgeführt. Es zeigte sich, dass nur eine sehr geringe und teilweise sehr stark streuende Datenbasis zur Verfügung steht und nur 14 Literaturstellen von elf Autoren verwertbare oder eingeschränkt verwertbare Angaben über die Geruchsemissionen aus der Geflügel-, Schweine- und Rindviehhaltung bieten. Die niedrigsten Geruchsemissionsfaktoren stammen aus der Rindviehhaltung, die höchsten aus der Schweinehaltung. Weitere systematische Messungen zur Bestimmung der Geruchsemissionen aus Nutztierställen sind notwendig.
description: LANDTECHNIK, Bd. 53 Nr. 4 (1998)