cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cryptocurrencies as an Alternative Asset Class
Creators: name: Mayer, Marius Max Lucas
Publisher: name: JUNIOR MANAGEMENT SCIENCE
Year: 2018

description: Bitcoin was the first digital currency to rely on a decentralized peer-to-peer network instead of a trusted third party. This was achieved through Bitcoin’s revolutionary underlying technology based on cryptographic proof: the blockchain. After Bitcoin’s emergence, many other so called cryptocurrencies entered the market and we have seen enormous price increases that romised large returns for early users. The return characteristics of cryptocurrencies have been studied by various scholars and some have even declared cryptocurrencies to be an asset class instead of a digital currency. Due to the fast changes in the cryptocurrency market and the increased importance of other cryptocurrencies than Bitcoin, we believe that research focusing on the financial performance of cryptocurrencies should be renewed on a regular basis. Therefore, with this work we aim to shed light on the return characteristics of cryptocurrencies in relation to traditional asset classes and on the potential of cryptocurrencies to improve portfolio diversification. In addition, we investigate the cryptocurrency market, describe selected cryptocurrencies in more detail and provide an overview of potential technological risks arising with the use of cryptocurrencies. Our results indicate that cryptocurrencies provide large return potentials with high levels of volatility but compared to traditional asset classes provide a higher level of return per level of risk. We also find that selected cryptocurrencies can improve diversification in a cryptocurrency portfolio, as well as in a portfolio of international equity and private equity investments.


Keywords: Alternative Asset Classes, Cryptocurrency, Portfolio Diversification, Risk-Reward Profile und Cryptocurrency Risks
description: JUNIOR MANAGEMENT SCIENCE, Bd. 3 Nr. 4 (2018)
BPS solitons in a Dirac-Born-Infeld action
Creators: name: Rubiera-Garcia, D.
name: Santos, C. dos
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present several classes of solitons in ($1+1$)-dimensional models where the standard canonical kinetic term is replaced by a Dirac-Born-Infeld (DBI) one. These are static solutions with finite energy and different properties, namely, they can have compact support, or be kink or lump-like, according to the type of potential chosen, which depend on the DBI parameter $β$. Through a combination of numerical and analytical arguments, by which the equation of motion is seen as that corresponding to \emph{another} canonical model with a new $β$-dependent potential and a $β$-deformed energy density, we construct models in which increasing smoothly the DBI parameter both the compacton radius, the thickness of the kink and the width of the lump get modified until each soliton reaches its standard canonical shape as $β\rightarrow \infty$. In addition we present compacton solutions whose canonical counterparts are not compact.
description: 13 single-column pages; final version to appear in J. Phys. A: Math. Gen
The influence of political regulations and market design on energy storage systems
Creators: name: Blaschke, Maximilian
Publisher: name: JUNIOR MANAGEMENT SCIENCE
Year: 2018

description: This study examines the profitability of residential storage systems in combination with photovoltaic systems for varying political scenarios and under different market conditions. By comparing the energy flows of a photovoltaic rooftop facility to an average German household’s consumption pattern, this thesis calculates the additional self-consumption that can be achieved through a battery storage system and values the resulting savings via a net present value approach. The simulations of this study identify boundaries for specific political regulations and market environments that can enable battery storage systems to be operated in a profitably way. Based on the assumptions of this thesis, current market conditions do not allow battery storage installations to generate positive returns on investment. Nevertheless, there could be lucrative opportunities in battery storage systems for future electricity price movements and sinking system costs.


Keywords: Battery storage, Solar photovoltaic power, Distributed electricity, Energy policy, Market regulation
description: JUNIOR MANAGEMENT SCIENCE, Bd. 3 Nr. 4 (2018)
The Relationship Between Obesity and Clinical and Oncologic Outcomes in The Surgical Management of Colorectal Cancer
Creators: name: BELL, STEPHEN WILLIAM
Publisher: name: Monash University
Year: 2023
Subjects: Surgery

description: This body of work has defined the problems associated with patients with obesity who develop colorectal cancer, and has explored a possible therapeutic intervention to reduce the impact obesity can have on the poorer outcomes of the surgical treatment for colorectal cancer. It has also examined the difficulties in running randomised controlled trials in surgery; along with exploring a tool for measuring the technical difficulty of a surgical procedure which will be useful in future surgical trials, surgical trainee assessment and the assessment of new techniques and technologies.
Economic- and Non-Economic Goals of Family Firms
Creators: name: Probst, Markus
Publisher: name: JUNIOR MANAGEMENT SCIENCE
Year: 2018

description: Motivated by a lack in the current literature, this thesis reviews academic research on the economic and noneconomic goals of family firms. Heretofore, no detailed overview of different goals embedded in the goal setting-, outcome-, and alignment process has been provided. Using a systematic literature search and review process, I identify 117 relevant studies in the fields of management, economics, and affiliated domains between 1963 and 2018. Beyond a more detailed overview of the current state of research, I outline goal setting, outcomes, alignment, and four different family firm goal classes. Lastly, I show avenues for future research in the family firm–goal field. Motivated by a lack in the current literature, this thesis reviews academic research on the economic and noneconomic goals of family firms. Heretofore, no detailed overview of different goals embedded in the goal setting-, outcome-, and alignment process has been provided. Using a systematic literature search and review process, I identify 117 relevant studies in the fields of management, economics, and affiliated domains between 1963 and 2018. Beyond a more detailed overview of the current state of research, I outline goal setting, outcomes, alignment, and four different family firm goal classes. Lastly, I show avenues for future research in the family firm–goal field.


Keywords: Family firms, economic goals, non-economic goals, socioemotional wealth
description: JUNIOR MANAGEMENT SCIENCE, Bd. 3 Nr. 4 (2018)
Spontaneous sense inversion in helical mesophases
Creators: name: Wensink, H. H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the pitch sensitivity of cholesteric phases of helicoidal patchy cylinders as a generic model for chiral (bio-)polymers and helix-shaped colloidal rods. The behaviour of the macroscopic cholesteric pitch is studied from microscopic principles by invoking a simple density functional theory generalised to accommodate weakly twisted director fields. Upon changing the degree of alignment along the local helicoidal director we find that cholesteric phases exhibit a sudden sense inversion whereby the cholesteric phase changes from left- to right-handed and vice versa. Since the local alignment is governed by thermodynamic variables such as density, temperature or the amplitude of an external directional field such pitch sense inversions can be expected in systems of helical mesogens of both thermotropic and lyotropic origin. We show that the spontaneous change of helical symmetry is a direct consequence of an antagonistic effective torque between helical particles with a certain prescribed internal helicity. The results may help opening up new routes towards precise control of the helical handedness of chiral assemblies by a judicious choice of external control parameters.
description: 6 pages, 4 figures, submitted. arXiv admin note: text overlap with arXiv:1004.2227
Perpetual colour: accessing the colourfastness of regenerated cellulose fibres from coloured cotton waste
Creators: name: Nasri-Nasrabadi, Bijan
name: Xungai Wang
name: Nolene Byrne
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Neuroscience
subject: Physiology
subject: Biotechnology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Plant Biology

description: In this work, waste cotton fabrics were chemically recycled to produce regenerated fibres, which retained the colour of the waste fabric. The colourfastness of the recycled fibres was measured and found to show no deterioration. The once-recylced fibres were subsequently recycled again through a similar approach, and some loss in colour intensity was noted in the twice-recycled fibres. However, the colourfastness of the twice-recycled fibres remained excellent. Finally, new colours were created via blending waste fabrics of different colours, a unique advantage achievable via a chemical recycling approach. Again, the colourfastness of the new blended colours was shown to be excellent. This work showed that the colourfastness and intensity of colour maintained for cotton fabrics, which had undergone a chemical recycling process twice.
JUNIOR MANAGEMENT SCIENCE, Bd. 3 Nr. 4 (2018)
Creators: name: JUNIOR MANAGEMENT SCIENCE
Publisher: name: JUNIOR MANAGEMENT SCIENCE
Year: 2018

description: Cryptocurrencies as an Alternative Asset Class...1-29
Economic- and Non-Economic Goals of Family Firms...30-47
Is the use of management accounting in startups a paradox? - A systematic literature review of how static management accounting practices can support dynamic startups...48-64
Corporate Social Responsibility: A Qualitative Analysis on the Strategy Formulation Process...65-80
International Strategic Emphasis, Marketing Capabilities und Shareholder Value: Die finanziellen Implikationen des Trade-offs zwischen internationaler Wertgenerierung und internationaler Wertschöpfung...81-113
The influence of political regulations and market design on energy storage systems...114-145
Фонетическое членение текстов как средство распознавания слитной речи в немецкоязычных регионах
Creators: name: Сообщество рецензентов Международного научно-исследовательского журнала
Publisher: name: ООО Цифра
Year: 2024
Subjects: phonetic division
segmentation
sounding speech
speech flow
microsegmentation
macrosegmentation
speech technologies
фонетическое членение
сегментация
звучащая речь
речевой поток
микросегментация
макросегментация
речевые технологии

description: Международный научно-исследовательский журнал, Выпуск 9 (147) 2024
Spectrally Pure RF Photonic Source Based on a Resonant Optical Hyper-Parametric Oscillator
Creators: name: Liang, W.
name: Eliyahu, D.
name: Matsko, A. B.
name: Ilchenko, V. S.
name: Seidel, D.
name: Maleki, L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate a free running 10GHz microresonator-based RF photonic hyper-parametric oscillator characterized with phase noise better than -60dBc/Hz at 10Hz, -90dBc/Hz at 100Hz, and -150dBc/Hz at 10MHz. The device consumes less than 25mW of optical power. A correlation between the frequency of the continuous wave laser pumping the nonlinear resonator and the generated RF frequency is confirmed. The performance of the device is compared with the performance of a standard optical fiber based coupled opto-electronic oscillator of OEwaves.
description: 9 pages, 8 figures. Wei Liang at al., Proceedings of SPIE Vol. 8960 (SPIE, Bellingham, WA 2014), 896010
The return of the native : being the curious continuing story of camels in America
Creators: name: Bocast, Chrys, 1962-
Publisher: name: The University of Texas at Austin
Year: 2005
Subjects: Camels
North America
Animal history

description: A physical and cultural history of the species Camelus in North America, from prehistoric times to the current day. Thorough description of the species; investigation of the North American camelid precursor, Camelops hesternus, including discussion and synthesis of late Pleistocene die-off theories. The attempt at introducing the camel to the American West; its subsequent absorption into American circuses and zoos. Historical analysis of Camel cigarette advertisements, culminating with the recent Joe Camel ads; examination of the ubiquitous portrayals of the camel as an ‘exotic’ animal. Documents American entrepreneurs currently rediscovering the camel as a utilitarian resource; concludes with camels as representational study, and the persistence of the horse culture in American society
Traffic Monitoring Using M2M Communication
Creators: name: Kumar, Shiu
name: Ham, Eun Sik
name: Lee, Seong Ro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This paper presents an intelligent traffic monitoring system using wireless vision sensor network that captures and processes the real-time video image to obtain the traffic flow rate and vehicle speeds along different urban roadways. This system will display the traffic states on the front roadways that can guide the drivers to select the right way and avoid potential traffic congestions. On the other hand, it will also monitor the vehicle speeds and store the vehicle details, for those breaking the roadway speed limits, in its database. The real-time traffic data is processed by the Personal Computer (PC) at the sub roadway station and the traffic flow rate data is transmitted to the main roadway station Arduino 3G via email, where the data is extracted and traffic flow rate displayed.
description: 2 pages, 2 figures, presented in local conference in Korea South
title: Dynamic Pricing in der österreichischen Ferienhotellerie
Creators: name: Leiter, Christoph
Publisher: name: TU Wien
Year: 2020
Subjects: subject: Revenue Management
subject: Gastgewerbe
subject: Preisgestaltung
subject: Preisethik
subject: Gästezufriedenheit
subject: Digitalisierung

description: Diese Masterthese befasst sich mit Dynamic Pricing in der österreichischen Ferienhotellerie. Dynamic Pricing ist mit Methoden des Revenue Managements verwandt und wird dazu eingesetzt, um beim Verkauf nicht lagerfähiger Güter den Umsatz zu steigern, indem der Preis auf Grund der Nachfrage und der verfügbaren Kapazität gesteuert wird. Während Dynamic Pricing in der Stadthotellerie bereits lange eingesetzt wird, ist diese Methode in der österreichischen Ferienhotellerie noch nicht weit verbreitet. Das Zieldieser Arbeit ist zu erforschen, auf welche Art Dynamic Pricing in der Ferienhotellerie verwendet werden kann. Dazu wurde eine Literaturrecherche durchgeführt, um rechtliche Anforderungen, ethische Bedenken sowie die Akzeptanz und Fairness von Dynamic Pricing zu ermitteln. Im Praxisteil wurden Expertengespräche mit Mitarbeitern der Ferienhotellerie, Hotelberatern und anderen Branchenkennern durchgeführt und mittelseiner qualitativen Inhaltsanalyse ausgewertet. Zusammenfassend kann gesagt wurden, dass Experten den Einsatz von Dynamic Pricing befürworten. Die wichtigsten Kriterien für den Einsatz, sind eine nachvollziehbare Preisgestaltung, eine gute, offene Kommunikation mit den Gästen und eine intensive Schulungen des gesamten Teams.
description: This master’s thesis deals with Dynamic Pricing in the Austrian leisure hotel industry. Dynamic Pricing is related to methods of Revenue Management and is used to increase revenue when selling perishable goods by controlling the price based on demand and available capacity. While dynamic pricing has long been used in the city hotel industry, this method is not yet widely used in the Austrian leisure hotel industry. The aim of this thesis is to research how Dynamic Pricing can be introduced in the leisure hotel industry. A literature research was carried out to identify legal requirements, ethical concerns as well as to determine the acceptance and fairness of Dynamic Pricing. Interviews were conducted with employees, hotel consultants and other industry experts. They were evaluated using qualitative content analysis. In summary, it can be said that experts are in favor of the use of Dynamic Pricing. The most important criteria for use are comprehensible pricing, good, open communication with the guests and intensive training for the entire team.
Kinematic structure of massive star-forming regions - I. Accretion along filaments
Creators: name: Tackenberg, J.
name: Beuther, H.
name: Henning, Th.
name: Linz, H.
name: Sakai, T.
name: Ragan, S. E.
name: Krause, O.
name: Nielbock, M.
name: Hennemann, M.
name: Pitann, J.
name: Schmiedeke, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The mid- and far-infrared view on high-mass star formation, in particular with the results from the Herschel space observatory, has shed light on many aspects of massive star formation. However, these continuum studies lack kinematic information. We study the kinematics of the molecular gas in high-mass star-forming regions. We complemented the PACS and SPIRE far-infrared data of 16 high-mass star-forming regions from the Herschel key project EPoS with N2H+ molecular line data from the MOPRA and Nobeyama 45m telescope. Using the full N2H+ hyperfine structure, we produced column density, velocity, and linewidth maps. These were correlated with PACS 70micron images and PACS point sources. In addition, we searched for velocity gradients. For several regions, the data suggest that the linewidth on the scale of clumps is dominated by outflows or unresolved velocity gradients. IRDC18454 and G11.11 show two velocity components along several lines of sight. We find that all regions with a diameter larger than 1pc show either velocity gradients or fragment into independent structures with distinct velocities. The velocity profiles of three regions with a smooth gradient are consistent with gas flows along the filament, suggesting accretion flows onto the densest regions. We show that the kinematics of several regions have a significant and complex velocity structure. For three filaments, we suggest that gas flows toward the more massive clumps are present.
description: accepted by A&A
Клиническое, функциональное и личностное восстановление как ориентир в реабилитации пациентов, перенёсших первый психотический эпизод
Creators: name: Сообщество рецензентов Международного научно-исследовательского журнала
Publisher: name: ООО Цифра
Year: 2024
Subjects: first psychotic episode
clinical recovery
functional recovery
personal recovery
patient rehabilitation
psychometric assessment
PANSS
SANS
BPRS
GAF
PSP
первый психотический эпизод
клиническое восстановление
функциональное восстановление
личностное восстановление
реабилитация пациентов
психометрическая оценка

description: Международный научно-исследовательский журнал, Выпуск 9 (147) 2024
Theory of Bosons in two-leg ladders with large magnetic fields
Creators: name: Wei, Ran
name: Mueller, Erich J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate the ground state of a Bose gas trapped on a two-leg ladder where Raman-induced hopping mimics the effect of a large magnetic field. In the mean-field limit, where there are large numbers of particles per site, this maps onto a uniformly frustrated two-leg ladder classical spin model. The net particle current always vanishes in the ground state, but generically there is a finite "chiral current", corresponding to equal and opposite flow on the two legs. We vary the strength of the hopping across the rungs of the ladder and the interaction between the bosons. We find three phases: (1) A "saturated chiral current phase" (SCCP), where the density is uniform and the chiral current is simply related to the strength of the magnetic field. In this state the only broken symmetry is the $U(1)$ condensate phase. (2) A "biased ladder phase" (BLP), where the density is higher on one leg than the other. The fluid velocity is higher on the lower density leg, so the net current is zero. In addition to the $U(1)$ condensate phase, this has a broken $Z_2$ reflection symmetry. (3) A "modulated density phase" (MDP), where the atomic density is modulated along the ladder. In addition to the $U(1)$ condensate phase, this has a second broken $U(1)$ symmetry corresponding to translations of the density wave. We further study the fluctuations of the condensate in the BLP, finding a roton-maxon like excitation spectrum. Decreasing the hopping along the rungs softens the spectrum. As the energy of the "roton" reaches to zero, the BLP becomes unstable. We describe the experimental signatures of these phases, including the response to changing the frequency of the Raman transition.
description: 6 pages, 4 figures, comments are welcome
Spin filtering in a magnetic barrier structure: in-plane spin orientation
Creators: name: Kim, Nammee
name: Kim, Heesang
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate ballistic spin transport in a two dimensional electron gas system through magnetic barriers of various geometries using the transfer matrix method. While most of the previous studies have focused on the effect of magnetic barriers perpendicular to the two dimensional electron gas plane, we concentrate on the case of magnetic barriers parallel to the plane. We show that resonant oscillation occurs in the transmission probability without electrostatic potential modulation which is an essential ingredient in the case of ordinary out-of-plane magnetic barriers. Transmission probability of the in-plane magnetic barrier structure changes drastically according to the number of barriers and also according to the electrostatic potential modulation applied in the magnetic barrier region. Using a hybrid model consisting of a superconductor, ferromagnets, and a two dimensional electron gas plane, we show that it can serve as a good in-plane oriented spin selector which can be operated thoroughly by electrical modulation without any magnetic control.
description: 3 pages, 5 figures, submitted to APL
МНОГОЛЕТНИЕ ИЗМЕНЕНИЯ ТЕМПЕРАТУРЫ ВОЗДУХА И КОЛИЧЕСТВА АТМОСФЕРНЫХ ОСАДКОВ В ГОРОДЕ ВОРОНЕЖ
Creators: name: Клепиков, Олег
Publisher: name: ООО Цифра
Year: 2024
Subjects: climate
meteorological conditions
precipitation
temperature
dry periods
global warming
климат
метеорологические условия
атмосферные осадки
температура
засушливые периоды
глобальное потепление

description: Международный научно-исследовательский журнал, Выпуск 9 (147) 2024
Semantic Annotation and Search for Educational Resources Supporting Distance Learning
Creators: name: Nithya, C.
name: Saravanan, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Retrieval (cs.IR)
subject: Computers and Society (cs.CY)
subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Multimedia educational resources play an important role in education, particularly for distance learning environments. With the rapid growth of the multimedia web, large numbers of education articles video resources are increasingly being created by several different organizations. It is crucial to explore, share, reuse, and link these educational resources for better e-learning experiences. Most of the video resources are currently annotated in an isolated way, which means that they lack semantic connections. Thus, providing the facilities for annotating these video resources is highly demanded. These facilities create the semantic connections among video resources and allow their metadata to be understood globally. Adopting Linked Data technology, this paper introduces a video annotation and browser platform with two online tools: Notitia and Sansu-Wolke. Notitia enables users to semantically annotate video resources using vocabularies defined in the Linked Data cloud. Sansu-Wolke allows users to browse semantically linked educational video resources with enhanced web information from different online resources. In the prototype development, the platform uses existing video resources for education articles. The result of the initial development demonstrates the benefits of applying Linked Data technology in the aspects of reusability, scalability, and extensibility
description: Linked Data, Semantic search, Cloud Applications, Web services, Semantic annotation, Ontology
SICB2021 Talk and poster tips from SPDAC
Creators: name: Hutchinson, John
name: Madelaire, Carla
name: Rummel, Andrea
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Tips for giving a virtual 2021 SICB talk or poster, from SPDAC
SICB2021 Talk tips from SPDAC
Creators: name: Hutchinson, John
name: Madelaire, Carla
name: Rummel, Andrea
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Tips for giving a virtual 2021 SICB talk, from SPDAC
Large Pseudo-Counts and $L_2$-Norm Penalties Are Necessary for the Mean-Field Inference of Ising and Potts Models
Creators: name: Barton, J. P.
name: Cocco, S.
name: De Leonardis, E.
name: Monasson, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Mean field (MF) approximation offers a simple, fast way to infer direct interactions between elements in a network of correlated variables, a common, computationally challenging problem with practical applications in fields ranging from physics and biology to the social sciences. However, MF methods achieve their best performance with strong regularization, well beyond Bayesian expectations, an empirical fact that is poorly understood. In this work, we study the influence of pseudo-count and $L_2$-norm regularization schemes on the quality of inferred Ising or Potts interaction networks from correlation data within the MF approximation. We argue, based on the analysis of small systems, that the optimal value of the regularization strength remains finite even if the sampling noise tends to zero, in order to correct for systematic biases introduced by the MF approximation. Our claim is corroborated by extensive numerical studies of diverse model systems and by the analytical study of the $m$-component spin model, for large but finite $m$. Additionally we find that pseudo-count regularization is robust against sampling noise, and often outperforms $L_2$-norm regularization, particularly when the underlying network of interactions is strongly heterogeneous. Much better performances are generally obtained for the Ising model than for the Potts model, for which only couplings incoming onto medium-frequency symbols are reliably inferred.
description: 25 pages, 17 figures
Chern-Simons and Born-Infeld gravity theories and Maxwell algebras type
Creators: name: Concha, P. K.
name: Peñafiel, D. M.
name: Rodríguez, E. K.
name: Salgado, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently was shown that standard odd and even-dimensional General Relativity can be obtained from a $(2n+1)$-dimensional Chern-Simons Lagrangian invariant under the $B_{2n+1}$ algebra and from a $(2n)$-dimensional Born-Infeld Lagrangian invariant under a subalgebra $\cal{L}^{B_{2n+1}}$ respectively. Very Recently, it was shown that the generalized Inönü-Wigner contraction of the generalized AdS-Maxwell algebras provides Maxwell algebras types $\cal{M}_{m}$ which correspond to the so called $B_{m}$ Lie algebras. In this article we report on a simple model that suggests a mechanism by which standard odd-dimensional General Relativity may emerge as a weak coupling constant limit of a $(2p+1)$-dimensional Chern-Simons Lagrangian invariant under the Maxwell algebra type $\cal{M}_{2m+1}$, if and only if $m\geq p$. Similarly, we show that standard even-dimensional General Relativity emerges as a weak coupling constant limit of a $(2p)$-dimensional Born-Infeld type Lagrangian invariant under a subalgebra $\cal{L}^{\cal{M}_{2m}}$ of the Maxwell algebra type, if and only if $m\geq p$. It is shown that when $m
description: 30 pages, accepted for publication in Eur.Phys.J.C. arXiv admin note: text overlap with arXiv:1309.0062
Why the Quantitative Condition Fails to Reveal Quantum Adiabaticity
Creators: name: Li, Dafa
name: Yung, Man-Hong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantitative adiabatic condition (QAC), or quantitative condition, is a convenient (a priori) tool for estimating the adiabaticity of quantum evolutions. However, the range of the applicability of QAC is not well understood. It has been shown that QAC can become insufficient for guaranteeing the validity of the adiabatic approximation, but under what conditions the QAC would become necessary has become controversial. Furthermore, it is believed that the inability for the QAC to reveal quantum adiabaticity is due to induced resonant transitions. However, it is not clear how to quantify these transitions in general. Here we present a progress to this problem by finding an exact relation that can reveal how transition amplitudes are related to QAC directly. As a posteriori condition for quantum adiabaticity, our result is universally applicable to any (nondegenerate) quantum system and gives a clear picture on how QAC could become insufficient or unnecessary for the adiabatic approximation, which is a problem that has gained considerable interest in the literature in recent years.
description: 17 pages, 1 figure; accepted by New Journal of Physics
Efficient Algorithms for Solving Nonlinear Inverse Problems in Image Reconstruction
Creators: name: Monardo, Vincent
Publisher: name: Carnegie Mellon University
Year: 2022
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Throughout many fields of science, images are used to display information in a relatable matter about objects which may not be directly visible. Instead, sensors are used–beyond standard cameras–to capture measurements of the object. These measurements are then processed to reconstruct an image of the object which created them. This process of reconstructing the cause of the observed effects is known as an inverse problem. In this thesis, algorithms are proposed for solving various inverse problems in image reconstruction. These algorithms are then analyzed to demonstrate their statistical and computational efficiency. The main through-line tying these problems together is that the proposed solutions leverage inherent structural information. The thesis begins by demonstrating how to design effective spectral methods for estimating an image from phaseless measurements given approximate knowledge of the structure of the noise effecting the system. Next, an amplitude-based loss function is proposed for solving a generalized matrix phaseless sensing problem and algorithms are derived which reach a critical point of such a loss function. Continuing, stochastic variance-reduction gradient techniques are applied to an algorithmic framework for reconstructing an image known as Plug-and-Play (PnP) to achieve faster computation times while maintaining high accuracy. The thesis closes by analyzing how to reconstruct a large set of images when there exists a global structure relating the images to each other. The methods presented in this thesis are applied to phase retrieval, compressive sensing magnetic resonance imaging, and electron back-scattered diffraction microscopy.
Spin effects in thermoelectric properties of Al and P doped zigzag silicene nanoribbons
Creators: name: Zberecki, K.
name: Swirkowicz, R.
name: Barnaś, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electric and thermoelectric properties of silicene nanoribbons doped with Al and P impurity atoms are investigated theoretically for both antiparallel and parallel orientations of the edge magnetic moments. In the former case, appropriately arranged impurities can lead to a net magnetic moment and thus also to spin thermoelectric effects. In the latter case, in turn, spin thermoelectric effects also occur in the absence of impurities. Numerical results based on ab-initio calculations show that the spin thermopower can be considerably enhanced by the impurities.
Higher order expansions via Stein method
Creators: name: Coutin, Laure
name: Decreusefond, Laurent
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: This paper is a sequel of \cite{CD:2012}. We show how to establish a functional Edgeworth expansion of any order thanks to the Stein method. We apply the procedure to the Brownian approximation of compensated Poisson process and to the linear interpolation of the Brownian motion. It is then apparent that these two expansions are of rather different form.
description: arXiv admin note: text overlap with arXiv:1207.3517
Ähnlichkeitsbasierte Suche in Geschäftsprozessmodelldatenbanken
Creators: name: Schoknecht, Andreas
Publisher: name: KIT Scientific Publishing
Year: 2018
Subjects: Geschäftsprozess
Prozessmodell-Matching
Ähnlichkeitsbasierte Suche
Anfragesprache
Business Process
Process Model Matching
Similarity-based Search
Query Language

description: Die Wiederverwendung von Prozessmodellen bietet sich zur Reduzierung des hohen Modellierungsaufwands an. Allerdings ist das Auffinden von ähnlichen Modellen in großen Modellsammlungen manuell nicht effizient möglich. Hilfreich sind daher Suchmöglichkeiten nach relevanten Modellen, die als Vorlage zur Modellierung genutzt werden können. In dieser Arbeit werden Ansätze beschrieben, um innerhalb von Prozessmodellbibliotheken nach ähnlichen Modellen und Aktivitäten zu suchen.
Mechanism of the enhanced conductance of a molecular junction under tensile stress
Creators: name: Saffarzadeh, Alireza
name: Demir, Firuz
name: Kirczenow, George
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Despite its fundamental importance for nano physics and chemistry and potential device applications, the relationship between atomic structure and electronic transport in molecular nanostructures is not well understood. Thus the experimentally observed increase of the conductance of some molecular nano junctions when they are stretched continues to be counterintuitive and controversial. Here we explore this phenomenon in propanedithiolate molecules bridging gold electrodes by means of {\em ab initio} computations and semi-empirical modeling. We show that in this system it is due to changes in Au-S-C bond angles and strains in the gold electrodes, rather than to the previously proposed mechanisms of Au-S bond stretching and an associated energy shift of the highest occupied molecular orbital and/or Au atomic chain formation. Our findings indicate that conductance enhancement in response to the application of tensile stress should be a generic property of molecular junctions in which the molecule is thiol-bonded in a similar way to gold electrodes.
description: 6 pages, 3 figures
Local quanta, unitary inequivalence, and vacuum entanglement
Creators: name: Rodriguez-Vazquez, Matias
name: del Rey, Marco
name: Westman, Hans
name: Leon, Juan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this work we develop a formalism for describing localised quanta for a real-valued Klein-Gordon field in a one-dimensional box $[0, R]$. We quantise the field using non-stationary local modes which, at some arbitrarily chosen initial time, are completely localised within the left or the right side of the box. In this concrete set-up we directly face the problems inherent to a notion of local field excitations, usually thought of as elementary particles. Specifically, by computing the Bogoliubov coefficients relating local and standard (global) quantizations, we show that the local quantisation yields a Fock space $\mathfrak F^L$ which is unitarily inequivalent to the standard one $\mathfrak F^G$. In spite of this, we find that the local creators and annihilators remain well defined in the global Fock space $\mathfrak F^G$, and so do the local number operators associated to the left and right partitions of the box. We end up with a useful mathematical toolbox to analyse and characterise local features of quantum states in $\mathfrak F^G$. Specifically, an analysis of the global vacuum state $|0_G\rangle\in\mathfrak F^G$ in terms of local number operators shows, as expected, the existence of entanglement between the left and right regions of the box. The local vacuum $|0_L\rangle\in\mathfrak F^L$, on the contrary, has a very different character. It is neither cyclic nor separating and displays no entanglement. Further analysis shows that the global vacuum also exhibits a distribution of local excitations reminiscent, in some respects, of a thermal bath. We discuss how the mathematical tools developed herein may open new ways for the analysis of fundamental problems in local quantum field theory.
description: 28 pages, 8 figures
An RIP-based approach to $ΣΔ$ quantization for compressed sensing
Creators: name: Feng, Joe-Mei
name: Krahmer, Felix
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we provide a new approach to estimating the error of reconstruction from $ΣΔ$ quantized compressed sensing measurements. Our method is based on the restricted isometry property (RIP) of a certain projection of the measurement matrix. Our result yields simple proofs and a slight generalization of the best-known reconstruction error bounds for Gaussian and subgaussian measurement matrices.
description: 11 pages
Constrained Quantum Optimization for Extractive Summarization on a Trapped-ion Quantum Computer
Creators: name: Niroula, Pradeep
name: Shaydulin, Ruslan
name: Yalovetzky, Romina
name: Minssen, Pierre
name: Herman, Dylan
name: Hu, Shaohan
name: Pistoia, Marco
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Realizing the potential of near-term quantum computers to solve industry-relevant constrained-optimization problems is a promising path to quantum advantage. In this work, we consider the extractive summarization constrained-optimization problem and demonstrate the largest-to-date execution of a quantum optimization algorithm that natively preserves constraints on quantum hardware. We report results with the Quantum Alternating Operator Ansatz algorithm with a Hamming-weight-preserving XY mixer (XY-QAOA) on trapped-ion quantum computer. We successfully execute XY-QAOA circuits that restrict the quantum evolution to the in-constraint subspace, using up to 20 qubits and a two-qubit gate depth of up to 159. We demonstrate the necessity of directly encoding the constraints into the quantum circuit by showing the trade-off between the in-constraint probability and the quality of the solution that is implicit if unconstrained quantum optimization methods are used. We show that this trade-off makes choosing good parameters difficult in general. We compare XY-QAOA to the Layer Variational Quantum Eigensolver algorithm, which has a highly expressive constant-depth circuit, and the Quantum Approximate Optimization Algorithm. We discuss the respective trade-offs of the algorithms and implications for their execution on near-term quantum hardware.
description: camera-ready version
Inducing micromechanical motion by optical excitation of a single quantum dot - experimental data and evaluation scripts
Creators: name: Kettler, Jan
name: Vaish, Nitika
name: Mercier de Lépinay, Laure
name: Besga, Benjamin
name: de Assis, Pierre-Louis
name: Bourgeois, Olivier
name: Auffèves, Alexia
name: Richard, Maxime
name: Claudon, Julien
name: Gérard, Jean-Michel
name: Pigeau, Benjamin
name: Arcizet, Olivier
name: Verlot, Pierre
name: Poizat, Jean-Philippe
Publisher: name: Zenodo
Year: 2020

description: This data set contains the raw data and the evaluation scripts applied to obtain the results published in "Inducing micromechanical motion by optical excitation of a single quantum dot". For details of the experimental procedure please refer to the main text of the article, as well as the supplementary information. The main archive (.zip) contains three Python / Jupyter notebooks: `cand3_modeV_induced_motion.ipynb` contains the analysis of the main results `cand3_modeV_optomechanical_coupling.ipynb` contains an analysis of the opto-mechanical coupling `cand3_modeV_thermal_motion.ipynb`contains an analysis of the thermal motion and effective mass Plots and data that were shown in the main text and supplementary information are written to a subfolder `exports`. Further subfolders contain the evaluated raw data. Two programs have been used to create the raw data. `LabOne` by Zurich Instruments has been used to acquire lock-in data from the micro-mechanical oscillator, as well as resonance-fluorescence data from the quantum dot. The data has been stored as comma separated values in (.csv).
 Additional data, i.e, the gradient for the optical mechanical motion detection, as well as photo-luminescence spectra of the quantum dot, have been acquired by a selfmade python software `LABCO`. This data has also been stored as comma separeted values (.csv). All scripts were written using Python 3.6.9, and evaluated in Jupyter using IPython 5.5.0. The following non-standard packages (all available through pypi.org) were used during the evaluation: `lmfit` 0.9.7 `matplotlib`2.1.1 `numpy` 1.13.3
Speed-of-light limitations in passive linear media
Creators: name: Welters, Aaron
name: Avniel, Yehuda
name: Johnson, Steven G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We prove that well-known speed of light restrictions on electromagnetic energy velocity can be extended to a new level of generality, encompassing even nonlocal chiral media in periodic geometries, while at the same time weakening the underlying assumptions to only passivity and linearity of the medium (either with a transparency window or with dissipation). As was also shown by other authors under more limiting assumptions, passivity alone is sufficient to guarantee causality and positivity of the energy density (with no thermodynamic assumptions). Our proof is general enough to include a very broad range of material properties, including anisotropy, bianisotropy (chirality), nonlocality, dispersion, periodicity, and even delta functions or similar generalized functions. We also show that the "dynamical energy density" used by some previous authors in dissipative media reduces to the standard Brillouin formula for dispersive energy density in a transparency window. The results in this paper are proved by exploiting deep results from linear-response theory, harmonic analysis, and functional analysis that had previously not been brought together in the context of electrodynamics.
description: 19 pages, 1 figure
Seven New Carbon-Enhanced Metal-Poor RR Lyrae Stars
Creators: name: Kennedy, Catherine R.
name: Stancliffe, Richard J.
name: Kuehn, Charles
name: Beers, Timothy C.
name: Kinman, T. D.
name: Placco, Vinicius M.
name: Reggiani, Henrique
name: Rossi, Silvia
name: Lee, Young Sun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report estimated carbon-abundance ratios, [C/Fe], for seven newly-discovered carbon-enhanced metal-poor (CEMP) RR Lyrae stars. These are well-studied RRab stars that had previously been selected as CEMP candidates based on low-resolution spectra. For this pilot study, we observed eight of these CEMP RR Lyrae candidates with the Wide Field Spectrograph (WiFeS) on the ANU 2.3m telescope. Prior to this study, only two CEMP RR Lyrae stars had been discovered: TY Gru and SDSS J1707+58. We compare our abundances to new theoretical models of the evolution of low-mass stars in binary systems. These simulations evolve the secondary stars, post accretion from an AGB donor, all the way to the RR Lyrae stage. The abundances of CEMP RR Lyrae stars can be used as direct probes of the nature of the donor star, such as its mass, and the amount of material accreted onto the secondary. We find that the majority of the sample of CEMP RR Lyrae stars is consistent with AGB donor masses of around 1.5 - 2.0 solar masses and accretion masses of a few hundredths of a solar mass. Future high-resolution studies of these newly-discovered CEMP RR Lyrae stars will help disentangle the effects of the proposed mixing processes that occur in such objects.
description: Accepted for publication in ApJ
Intrinsic optical conductivity of modified-Dirac fermion systems
Creators: name: Rostami, Habib
name: Asgari, Reza
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We analytically calculate the intrinsic longitudinal and transverse optical conductivities of electronic systems which govern by a modified-Dirac fermion model Hamiltonian for materials beyond graphene such as monolayer MoS$_2$ and ultrathin film of the topological insulator. We analyze the effect of a topological term in the Hamiltonian on the optical conductivity and transmittance. We show that the optical response enhances in the non-trivial phase of the ultrathin film of the topological insulator and the optical Hall conductivity changes sign at transition from trivial to non-trivial phases which has significant consequences on a circular polarization and optical absorption of the system.
description: 14 pages, 9 figures. To appear in Phys. Rev. B