cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Applied anthropology and the Media Sphere: the benefits of possible convergence
Creators: name: Stojanovic, Dorde  (Στογιανοβιτζ, Τζορτζε Μιλούτιν)
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ανθρωπολογία των μέσων μαζικής ενημέρωσης
Ψηφιακά μέσα
Ψηφιακό PR
Media anthropology
Digital Media
Digital PR

description: Contemporary applied anthropology is a wide scientific field that includes diverse application spheres, from culture and human rights through health and nutrition up to wildlife and urban development (Kedla 2005, 138). The media attracted the research interest of anthropology far later than it did for other social sciences and humanities (Banic-Grubisic 2013, 139). Today applied anthropology has found its place in journalism and marketing but not yet in public relations. The main hypothesis of this dissertation is that applied anthropology has the potential to make a vital contribution to the field of PR. PR is an interdisciplinary field where methods and theories derived from a range of social sciences have already been successfully applied. All the while, the recent development of digital PR is making way for the application of cyber anthropology theory and methods, which have already made an impact on cyber research. Besides comparing anthropology and PR theory and method, interviews were done with six PR practitioners to find out whether there are conditions for innovations in PR practice and how much PR practitioners are ready to accept innovations coming from applied anthropology.
description: Η σύγχρονη εφαρμοσμένη ανθρωπολογία αποτελεί ένα ευρύ επιστημονικό πεδίο που περιλαμβάνει ποικίλους τομείς εφαρμογής, από τον πολιτισμό και τα ανθρώπινα δικαιώματα έως την υγεία και τη διατροφή μέχρι την άγρια ζωή και την αστική ανάπτυξη (Kedla 2005, 138). Τα μέσα μαζικής ενημέρωσης προσέλκυσαν το ερευνητικό ενδιαφέρον της ανθρωπολογίας πολύ αργότερα από ό, τι για άλλες κοινωνικές και ανθρωπιστικές επιστήμες (Banic-Grubisic 2013, 139). Σήμερα η εφαρμοσμένη ανθρωπολογία έχει βρει τη θέση της στη δημοσιογραφία και το μάρκετινγκ, αλλά όχι ακόμη στις δημόσιες σχέσεις. Κύριος στόχος αυτής της διατριβής είναι να αποδείξει ότι η εφαρμοσμένη ανθρωπολογία έχει τη δυνατότητα να συμβάλει ουσιαστικά στον τομέα των δημοσίων σχέσεων (PR). Το PR είναι ένα διεπιστημονικό πεδίο όπου οι μέθοδοι και οι θεωρίες που προέρχονται από μια σειρά κοινωνικών επιστημών έχουν ήδη εφαρμοστεί με επιτυχία. Στο μεταξύ, η πρόσφατη ανάπτυξη του ψηφιακού PR καθιστά δυνατή την εφαρμογή της θεωρίας και των μεθόδων της ανθρωπολογίας στον κυβερνοχώρο, οι οποίες έχουν ήδη επηρεάσει την έρευνα στον κυβερνοχώρο. Εκτός από τη σύγκριση της ανθρωπολογίας και της θεωρίας και της μεθόδου PR, πραγματοποιήθηκαν συνεντεύξεις με έξι επαγγελματίες PR με σκοπό να διερευνηθεί αν υπάρχουν προϋποθέσεις για καινοτομίες στην πρακτική των δημοσίων σχέσεων και πόσοι επαγγελματίες PR είναι έτοιμοι να αποδεχτούν καινοτομίες που προέρχονται από την εφαρμοσμένη ανθρωπολογία.
Selection rules for structured light in nanooligomers and other nanosystems
Creators: name: Reich, S.
name: Mueller, N. S.
name: Bubula, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Structured light are custom light fields where the phase, polarization, and intensity vary with position. It has been used for nanotweezers, nanoscale imaging, and quantum information technology, but its role in exciting optical transitions in materials has been little examined so far. Here we use group theory to derive the optical selection rules for nanosystems that get excited by structured light. If the size of the nanostructure is comparable to the light wavelength, it will sample the full beam profile during excitation with profound consequences on optical excitations. Using nanooligomers as model nanosystems, we show that structured light excites optical transitions that are forbidden for linearly polarized or unpolarized light. Such dipole forbidden modes have longer lifetimes and narrower resonances than dipole allowed transitions. We derive symmetry-adapted eigenmodes for nanooligomers containing up to six monomers. Our study includes tables with selection rules for cylindrical vector beams, for beams with orbital angular momentum, and for field retardation along the propagation direction. We discuss multi-photon processes of nonlinear optics in addition to one-photon absorption. Structured light will unlock a broad range of excitations in nanooligomers and other nanostructures that are currently inaccessible to optical studies.
Transcription of file 028_A (collection LA 256)
Creators: name: Parker, Verdena
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-090812-01: Transcription of file 028_A (referred to here as 029_A) from LA 256 (a collection of recordings given to the Berkeley Language Center by Verdena), from 14:14 to 15:55. The file was assigned a provisional identifier 029_A that was changed to 028_A in the final cataloging for the collection; file 028_A was subsequently assigned the identifier LA256.028A and associated with the bundle LA256.028 in the California Language Archive.
Measuring and Optimizing System Reliability: A Stochastic Programming Approach
Creators: name: Pulsipher, Joshua L.
name: Zavala, Victor M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We propose a computational framework to quantify (measure) and to optimize the reliability of complex systems. The approach uses a graph representation of the system that is subject to random failures of its components (nodes and edges). Under this setting, reliability is defined as the probability of finding a path between sources and sink nodes under random component failures and we show that this measure can be computed by solving a stochastic mixed-integer program. The stochastic programming setting allows us to account for system constraints and general probability distributions to characterize failures and allows us to derive optimization formulations that identify designs of maximum reliability. We also propose a strategy to approximately solve these problems in a scalable manner by using purely continuous formulations.
Sputtered Gold as an Effective Schottky Gate for Strained Si/SiGe Nanostructures
Creators: name: Scott, G. D.
name: Xiao, M.
name: Croke, E. T.
name: Yablonovitch, E.
name: Jiang, H. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Metallization of Schottky surface gates by sputtering Au on strained Si/SiGe heterojunctions enables the depletion of the two dimensional electron gas (2DEG) at a relatively small voltage while maintaining an extremely low level of leakage current. A fabrication process has been developed to enable the formation of sub-micron Au electrodes sputtered onto Si/SiGe without the need of a wetting layer.
description: 3 pages, 3 figures
Higgs boson self-coupling constraints from single Higgs, double Higgs and Electroweak measurements
Creators: name: Degrassi, Giuseppe
name: Di Micco, Biagio
name: Giardino, Pier Paolo
name: Rossi, Eleonora
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We set constraints on the trilinear Higgs boson self-coupling, $λ_3$, by combining the information coming from the $W$ mass and leptonic effective Weinberg angle, electroweak precision observables, with the single Higgs boson analyses targeting the $γγ,\, ZZ^*,\, WW^*, \,τ^+ τ^-$ and $\bar{b} b$ decay channels and the double Higgs boson analyses in the $b\bar{b}b\bar{b}, \, b\bar{b}b τ^+ τ^-$ and $b\bar{b}b γγ$ decay channels, performed by the ATLAS collaboration. With the assumption that the new physics affects only the Higgs potential, values outside the interval $ -1.8\, λ_3^{\rm SM} < λ_3 < 9.2 \, λ_3^{\rm SM}$ are excluded at $95\%$ confidence level. With respect to similar analyses that do not include the information coming from the electroweak precision observables our analysis shows a stronger constraint on both positive and negative values of $λ_3$.
description: 13 pages, 4 figures, to be submitted to Phys. Lett. B
Orbital precession due to central-force perturbations
Creators: name: Adkins, Gregory S.
name: McDonnell, Jordan
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We calculate the precession of Keplerian orbits under the influence of arbitrary central-force perturbations. Our result is in the form of a one-dimensional integral that is straightforward to evaluate numerically. We demonstrate the effectiveness of our formula for the case of the Yukawa potential. We obtain analytic results for potentials of the form V(r) = αr^n and V(r) = α\ln(r/λ) in terms of the hypergeometric function {_2F_1} (1/2-n/2,1-n/2; 2; e^2), where e is the eccentricity. Our results reproduce the known general relativistic (n=-3), constant force (n=1), and cosmological constant (n=2) precession formulas. Planetary precessions are often used to constrain the sizes of hypothetical new weak forces--our results allow for more precise, and often stronger, constraints on such proposed new forces.
description: 10 pages, 1 figure
Experimental space-division multiplexed polarization-entanglement distribution through 12 paths of a multicore fiber
Creators: name: Ortega, Evelyn A.
name: Dovzhik, Krishna
name: Fuenzalida, Jorge
name: Wengerowsky, Soeren
name: Alvarado-Zacarias, Juan Carlos
name: Shiozaki, Rodrigo F.
name: Amezcua-Correa, Rodrigo
name: Bohmann, Martin
name: Ursin, Rupert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The development and wide application of quantum technologies highly depend on the capacity of the communication channels distributing entanglement. Space-division multiplexing (SDM) enhanced channel capacities in classical telecommunication and bears the potential to transfer the idea to quantum communication using current infrastructure. Here, we demonstrate an SDM of polarization-entangled photons over a 411m long 19-core multicore fiber distributing polarization-entangled photon pairs through up to 12 channels simultaneously. The quality of the multiplexed transfer is evidenced by high polarization visibility and CHSH Bell inequality violation for each pair of opposite cores. Our distribution scheme shows high stability over 24 hours without any active polarization stabilization and can be effortlessly adapted to a higher number of channels. This technique increases the quantum-channel capacity and allows the reliable implementation of quantum networks of multiple users based on a single entangled-photon pair source.
Na Site Doping a Pathway for Enhanced Thermoelectric Performance in $Na_{1-x}CoO_2$; The Case of Gd and Yb Dopants
Creators: name: Assadi, M. Hussein N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Doping is considered to be the main method for improving the thermoelectric performance of layered sodium cobaltate (Na$_{1-x}$CoO$_2$). However, in the vast majority of past reports, the equilibrium location of the dopant in the Na$_{1-x}$CoO$_2$'s complex layered lattice has not been confidently identified. Consequently, a universal strategy for choosing a suitable dopant for enhancing Na$_{1-x}$CoO$_2$'s figure of merit is yet to be established. Here, by examining the formation energy of Gd and Yb dopants in Na$_{0.75}$CoO$_2$ and Na$_{0.50}$CoO$_2$, we demonstrate that in an oxygen poor environment, Gd and Yb dopants reside in the Na layer while in an oxygen rich environment these dopants replace a Co in CoO$_2$ layer. When at Na layer, Gd and Yb dopants reduce the carrier concentration via electron-hole recombination, simultaneously increasing the Seebeck coefficient ($S$) and reducing electric conductivity ($σ$). Na site doping, however, improves the thermoelectric power factor (PF) only in Na$_{0.50}$CoO$_2$. When replacing a Co, these dopants reduce $S$ and PF. The results demonstrate how thermoelectric performance critically depends on the synthesis environment that must be fine-tuned for achieving any thermoelectric enhancement.
description: Six figures and Supplementary Materials
Suitability of A_4 as a Family Symmetry in Grand Unification
Creators: name: Ma, Ernest
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the recent successful applications of the non-Abelian discrete symmetry A_4 to the tribimaximal mixing of neutrinos, lepton doublets and singlets do not transform in the same way. It appears thus to be unsuitable as a family symmetry in grand unification. A simple resolution of this dilemma is proposed.
description: 6 pages, no figure
Prediction of Influenza A virus infections in humans using an Artificial Neural Network learning approach
Creators: name: Chrysostomou, Charalambos
name: Partaourides, Harris
name: Seker, Huseyin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: The Influenza type A virus can be considered as one of the most severe viruses that can infect multiple species with often fatal consequences to the hosts. The Haemagglutinin (HA) gene of the virus has the potential to be a target for antiviral drug development realised through accurate identification of its sub-types and possible the targeted hosts. In this paper, to accurately predict if an Influenza type A virus has the capability to infect human hosts, by using only the HA gene, is therefore developed and tested. The predictive model follows three main steps; (i) decoding the protein sequences into numerical signals using EIIP amino acid scale, (ii) analysing these sequences by using Discrete Fourier Transform (DFT) and extracting DFT-based features, (iii) using a predictive model, based on Artificial Neural Networks and using the features generated by DFT. In this analysis, from the Influenza Research Database, 30724, 18236 and 8157 HA protein sequences were collected for Human, Avian and Swine, respectively. Given this set of the proteins, the proposed method yielded 97.36% (+- 0.04%), 97.26% (+- 0.26%), 0.978 (+- 0.004), 0.963 (+- 0.005) and 0.945 (+- 0.005) for the training accuracy validation accuracy, precision, recall and Mathews Correlation Coefficient (MCC) respectively, based on a 10-fold cross-validation. The classification model generated by using one of the largest dataset, if not the largest, yields promising results that could lead to early detection of such species and help develop precautionary measurements for possible human infections.
Formation time scaling and hadronization in cold nuclear matter
Creators: name: Accardi, Alberto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: I propose a scaling analysis of the hadron multiplicity ratio measured in Deep Inelastic Scattering on nuclear targets as a tool to distinguish energy loss and nuclear absorption effects on hadron suppression in cold nuclear matter. The proposed scaling variable is a function of the hadron fractional energy and of the virtual photon energy. Its functional form, which depends on a parameter λ, can be fixed by general theoretical considerations and encompasses both energy loss and absorption models. The parameter λis fitted to HERMES experimental data and shown to favor prehadron nuclear absorption as leading mechanism for hadron suppression as opposed to quark energy loss.
description: 6 pages, 5 figures. Extended discussions. Low- and high formation time cuts analyzed, 1 plot added. To appear in Phys.Lett.B
Quantum Computing for Location Determination
Creators: name: Shokry, Ahmed
name: Youssef, Moustafa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum computing provides a new way for approaching problem solving, enabling efficient solutions for problems that are hard on classical computers. It is based on leveraging how quantum particles behave. With researchers around the world showing quantum supremacy and the availability of cloud-based quantum computers with free accounts for researchers, quantum computing is becoming a reality. In this paper, we explore both the opportunities and challenges that quantum computing has for location determination research. Specifically, we introduce an example for the expected gain of using quantum algorithms by providing an efficient quantum implementation of the well-known RF fingerprinting algorithm and run it on an instance of the IBM Quantum Experience computer. The proposed quantum algorithm has a complexity that is exponentially better than its classical algorithm version, both in space and running time. We further discuss both software and hardware research challenges and opportunities that researchers can build on to explore this exciting new domain.
Application of the extended Kalman filter to enzyme reactions
Creators: name: Lai, Henry K. H.
Publisher: name: University of British Columbia
Year: 2008

description: In monitoring biological processes, measurement of key variables is often impeded by the lack of reliable on-line measurements of biomass, substrate, and product concentrations, and the difficulty to properly model biological activity in processes that are nonlinear and time-varying. One approach to solving this problem involves the development of state estimation techniques that use available measurements to reconstruct the evolution of state variables or to estimate the bioprocess parameters. The use of filtering theory for state estimation provides a means of incorporating a deterministic model into a method of forecasting future states which includes the probabilistic uncertainties of both the system and the measuring devices. The state estimation technique we use is the discrete extended Kalman filter. This method allows the use of an approximate model and partial measurements of process variables. To study the application of the discrete extended Kalman filter to a biological problem, we used two different enzyme reactions as model systems. The first model problem is a simulation of cellulose hydrolysis with enzyme inactivation. The second model problem is a simulation of the separation of a chiral substance into its respective enantiomers. In the first problem, the hydrolysis of cellulose, a slowly varying parameter is tracked after correctly choosing the model error covariance matrix. In the second problem, we reconstruct the complete composition of the system from a partial set of measurements. Although these model problems are simple cases involving only single enzymes, the extended Kalman filter can be applied to more complex systems of enzymes.
A survey of recommender systems for energy efficiency in buildings: Principles, challenges and prospects
Creators: name: Himeur, Yassine
name: Alsalemi, Abdullah
name: Al-Kababji, Ayman
name: Bensaali, Faycal
name: Amira, Abbes
name: Sardianos, Christos
name: Dimitrakopoulos, George
name: Varlamis, Iraklis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Recommender systems have significantly developed in recent years in parallel with the witnessed advancements in both internet of things (IoT) and artificial intelligence (AI) technologies. Accordingly, as a consequence of IoT and AI, multiple forms of data are incorporated in these systems, e.g. social, implicit, local and personal information, which can help in improving recommender systems' performance and widen their applicability to traverse different disciplines. On the other side, energy efficiency in the building sector is becoming a hot research topic, in which recommender systems play a major role by promoting energy saving behavior and reducing carbon emissions. However, the deployment of the recommendation frameworks in buildings still needs more investigations to identify the current challenges and issues, where their solutions are the keys to enable the pervasiveness of research findings, and therefore, ensure a large-scale adoption of this technology. Accordingly, this paper presents, to the best of the authors' knowledge, the first timely and comprehensive reference for energy-efficiency recommendation systems through (i) surveying existing recommender systems for energy saving in buildings; (ii) discussing their evolution; (iii) providing an original taxonomy of these systems based on specified criteria, including the nature of the recommender engine, its objective, computing platforms, evaluation metrics and incentive measures; and (iv) conducting an in-depth, critical analysis to identify their limitations and unsolved issues. The derived challenges and areas of future implementation could effectively guide the energy research community to improve the energy-efficiency in buildings and reduce the cost of developed recommender systems-based solutions.
description: 35 pages, 11 figures, 1 table
Discussion of miscellaneous topics
Creators: name: Parker, Verdena
name: Begay, Kayla
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-080812-09a/c/e: Discussion of miscellaneous topics, mostly in English with Hupa vocabulary interspersed. Topics include a song about birds by Sonny Pratt, some recordings that were destroyed, the story of Coyote and the Sweetball, who can tell stories, and anecdotes about people from Hoopa.
Dynamics of Enceladus and Dione inside the 2:1 Mean-Motion Resonance under Tidal Dissipation
Creators: name: Callegari, N.
name: Yokoyama, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In a previous work (Callegari and Yokoyama 2007, Celest. Mech. Dyn. Astr. vol. 98), the main features of the motion of the pair Enceladus-Dione were analyzed in the frozen regime, i.e., without considering the tidal evolution. Here, the results of a great deal of numerical simulations of a pair of satellites similar to Enceladus and Dione crossing the 2:1 mean-motion resonance are shown. The resonance crossing is modeled with a linear tidal theory, considering a two-degrees-of-freedom model written in the framework of the general three-body planar problem. The main regimes of motion of the system during the passage through resonance are studied in detail. We discuss our results comparing them with classical scenarios of tidal evolution of the system. We show new scenarios of evolution of the Enceladus-Dione system through resonance not shown in previous approaches of the problem.
description: 36 pages, 12 figures. Accepted in Celestial Mechanics and Dynamical Astronomy
A Continuous-Time Approach for 3D Radar-to-Camera Extrinsic Calibration
Creators: name: Wise, Emmett
name: Peršić, Juraj
name: Grebe, Christopher
name: Petrović, Ivan
name: Kelly, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Reliable operation in inclement weather is essential to the deployment of safe autonomous vehicles (AVs). Robustness and reliability can be achieved by fusing data from the standard AV sensor suite (i.e., lidars, cameras) with weather robust sensors, such as millimetre-wavelength radar. Critically, accurate sensor data fusion requires knowledge of the rigid-body transform between sensor pairs, which can be determined through the process of extrinsic calibration. A number of extrinsic calibration algorithms have been designed for 2D (planar) radar sensors - however, recently-developed, low-cost 3D millimetre-wavelength radars are set to displace their 2D counterparts in many applications. In this paper, we present a continuous-time 3D radar-to-camera extrinsic calibration algorithm that utilizes radar velocity measurements and, unlike the majority of existing techniques, does not require specialized radar retroreflectors to be present in the environment. We derive the observability properties of our formulation and demonstrate the efficacy of our algorithm through synthetic and real-world experiments.
description: In Proceedings of the IEEE International Conference on Robotics and Automation (ICRA'21), Xi'an, China, May 30-Jun. 5, 2021
Implicit-explicit methods for time-dependent PDE’s
Creators: name: Ruuth, Steven J.
Publisher: name: University of British Columbia
Year: 2008

description: Various methods have been proposed to integrate dynamical systems arising from spatially discretized time-dependent partial differential equations. For problems with terms of different types, implicit-explicit (IMEX) schemes have been used, especially in conjunction with spectral methods. For convection-diffusion problems, for example, one would use an explicit scheme for the convection term and an implicit scheme for thediffusion term. Reaction-diffusion problems can also be approximated in this manner. In this work we systematically analyze the performance of such schemes, propose improved new schemes and pay particular attention to their relative performance in the context of fast multigrid algorithms and aliasing reduction for spectral methods. For the prototype linear advection-diffusion equation, a stability analysis for first, second, third and fourth order multistep IMEX schemes is performed. Stable schemes permitting large time steps for a wide variety of problems and yielding appropriate decay of high frequency error modes are identified. Numerical experiments demonstrate that weak decay of high frequency modes can lead to extra iterations on the finest grid when using multigrid computations with finite difference spatial discretization, and to aliasing when using spectral collocation for spatial discretization. When this behaviour occurs, use of weakly damping schemes such as the popular combination of Crank-Nicolson with second order Adams-Bashforth is discouraged and better alternatives are proposed. Our findings are demonstrated on several examples.
Quantum simulation of antiferromagnetic Heisenberg chain with gate-defined quantum dots
Creators: name: van Diepen, C. J.
name: Hsiao, T. -K.
name: Mukhopadhyay, U.
name: Reichl, C.
name: Wegscheider, W.
name: Vandersypen, L. M. K.
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: Quantum-mechanical correlations of interacting fermions result in the emergence of exotic phases. Magnetic phases naturally arise in the Mott-insulator regime of the Fermi-Hubbard model, where charges are localized and the spin degree of freedom remains. In this regime, the occurrence of phenomena such as resonating valence bonds, frustrated magnetism, and spin liquids is predicted. Quantum systems with engineered Hamiltonians can be used as simulators of such spin physics to provide insights beyond the capabilities of analytical methods and classical computers. To be useful, methods for the preparation of intricate many-body spin states and access to relevant observables are required. Here, we show the quantum simulation of magnetism in the Mott-insulator regime with a linear quantum-dot array. We characterize the energy spectrum for a Heisenberg spin chain, from which we can identify when the conditions for homogeneous exchange couplings are met. Next, we study the multispin coherence with global exchange oscillations in both the singlet and triplet subspace of the Heisenberg Hamiltonian. Last, we adiabatically prepare the low-energy global singlet of the homogeneous spin chain and probe it with two-spin singlettriplet measurements on each nearest-neighbor pair and the correlations therein. The methods and control presented here open new opportunities for the simulation of quantum magnetism benefiting from the flexibility in tuning and layout of gate-defined quantum-dot arrays.
description: 15 pages, 11 figures
Line-of-sight percolation
Creators: name: Bollobas, Bela
name: Janson, Svante
name: Riordan, Oliver
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 60K35; 05C80

description: Given $ω\ge 1$, let $Z^2_{(ω)}$ be the graph with vertex set $Z^2$ in which two vertices are joined if they agree in one coordinate and differ by at most $ω$ in the other. (Thus $Z^2_{(1)}$ is precisely $Z^2$.) Let $p_c(ω)$ be the critical probability for site percolation in $Z^2_{(ω)}$. Extending recent results of Frieze, Kleinberg, Ravi and Debany, we show that $\lim_{ω\to\infty} ω\pc(ω)=\log(3/2)$. We also prove analogues of this result on the $n$-by-$n$ grid and in higher dimensions, the latter involving interesting connections to Gilbert's continuum percolation model. To prove our results, we explore the component of the origin in a certain non-standard way, and show that this exploration is well approximated by a certain branching random walk.
description: Revised and expanded (section 2.3 added). To appear in Combinatorics, Probability and Computing. 27 pages, 4 figures
Coherence properties of spinor condensates at finite temperatures
Creators: name: Gawryluk, Krzysztof
name: Brewczyk, Miroslaw
name: Gajda, Mariusz
name: Rzazewski, Kazimierz
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We consider a spinor condensate of 87Rb atoms in its F=1 hyperfine state at finite temperatures. Putting initially all atoms in m_F=0 component we find that the system evolves into the state of thermal equilibrium. This state is approached in a step-like process and when established it manifests itself in distinguishable ways. The atoms in states m_F=+1 and m_F=-1 start to rotate in opposite directions breaking the chiral symmetry and showing highly regular spin textures. Also the coherence properties of the system changes dramatically. Depending on the strength of spin-changing collisions the system first enters the stage where the m_F=+1 and m_F=-1 spinor condensate components periodically loose and recover their mutual coherence whereas their thermal counterparts get completely dephased. For stronger spin changing collisions the system enters the regime where also the strong coherence between other components is built up.
description: 5 pages, 4 figures
FILOLOGIYA SOHASINI RIVOJLANTIRISHDAGI ISHLAR
Creators: name: Yuldosheva, Begoyim
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada umumta’lim maktablari adabiyot darslarida asar badiiyatini o‘qitishning tarixi haqida so‘z boradi. Adabiyot darslarida asar badiiyatini o‘quvchilarga yetkazish ijodkorlarlar hayot faoliyati, asarlari tahlil qilinadi. Shuningdek, adabiyot tarsliklarining yaratilishi, tanlangan asarlar tarixi xususida so‘z boradi.
Transcription of a story about early encounters with non-Indians
Creators: name: Parker, Verdena
name: Begay, Kayla
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-080812-10: Transcription of a story about early encounters between Indian, white, and Chinese people in Hoopa Valley (file VP-091010-04), from 16:47 to the end of the story at 17:30.
Hopf bifurcations in magnetoconvection in the presence of sidewalls
Creators: name: Zangeneh, Hamid
Publisher: name: University of British Columbia
Year: 2008

description: We study multiple Hopf bifurcations that occur in a model of a layer of a viscous, electrically conducting fluid that is heated from below in the presence of a. magnetic field. We assume that the fluid flow is two-dimensional, and consider the effects of sidewalls with stress-free boundary conditions. Our model partial differential equations together with the boundary conditions have two reflection symmetries. We use center manifold theory to reduce the partial differential equations to a two-parameter family of four-dimensional ordinary differential equations. We show that two different normal forms are appropriate-ate, depending on the sizes of certain magnetoconvection parameters for large aspect ratios. AVe denote the two normal forms by "Case I" and "Case II". In both cases we prove the primary Hopf bifurcation of standing wave (SW) solutions, and we prove the existence of secondary Hopf bifurcations of invariant tori from the SW solutions. We prove that the tori persist in 'wedges' in the parametric plane. In Case II we show that there are also secondary Bogdanov-Takens bifurcation points. Using this, we show there are additional secondary and tertiary bifurcations of periodic solutions and invariant tori, and also argue that generically, there exist transversal homoclinic and heteroclinc points, and consequently open regions of parameter space that correspond to chaos of chaotic regions, and show the existence of quasiperiodic saddle-node bifurcations of invariant tori. Also, we show that in this case the system is a small perturbation of a system with the symmetries of the square, as the aspect ratio approaches infinity.
Polymers' surface interactions with molten iron: a theoretical study
Creators: name: Assadi, M. Hussein N.
name: Sahajwalla, Veena
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Environmental concerns are the chief drive for more innovative recycling techniques for end-of-life polymeric products. One attractive option is taking advantage of C and H content of polymeric waste in steelmaking industry. In this work, we examined the interaction of two high production polymers, i.e., polyurethane and polysulfide with molten iron using ab initio molecular dynamics simulation. We demonstrate that both polymers can be used as carburizers for molten iron. Additionally, we found that light weight H$_2$ and CH$_x$ molecules were released as by-products of the polymer-molten iron interaction. The outcomes of this study will have applications in the carburization of molten iron during ladle metallurgy and waste plastic injection in electric arc furnace.
description: 4 figures and 1 table
Μη συμβατικές νομισματικές πολιτικές και κερδοφορία τραπεζών στην ζώνη του ευρώ
Creators: name: Ευσταθιάδης, Ιωάννης Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Μη συμβατικές νομισματικές πολιτικές
Κερδοφορία τραπεζών
Κλίση καμπύλης επιτοκίου
Ευρωζώνη
Unconventional monetary policies
Bank profitability
Slope of yield curve
Eurozone

description: Η οικονομική κρίση του 2007 αποτέλεσε αιτία να επανέλθει στο ακαδημαϊκό προσκήνιο η σχέση των νομισματικών πολιτικών με την κερδοφορία των τραπεζών. Οι νομισματικές πολιτικές της Ευρωπαϊκής Κεντρικής Τράπεζας πλέον έχουν διαφοροποιηθεί για να ανταποκριθούν στις προκλήσεις που εμφανίστηκαν λόγω της χρηματοπιστωτικής κρίσης. Σε αυτήν την εργασία διερευνήθηκαν οι σχέσεις που διέπουν την μη συμβατική νομισματική πολιτική με το κέρδος των τραπεζών στην ζώνη του ευρώ. Χρησιμοποιώντας την μεθοδολογία System GMM σε ένα δείγμα 13 χωρών της ευρωζώνης εξήχθησαν δύο βασικά συμπεράσματα. Το πρώτο σχετίζεται με την ύπαρξη θετικής σχέσης μεταξύ της κλίσης της καμπύλης επιτοκίου και της κερδοφορίας των τραπεζών. Η σχέση αυτή φαίνεται ισχυρότερη όταν η καμπύλη επιτοκίου είναι πιο οριζόντια. Δεύτερον, τα ίδια κεφάλαια στον ισολογισμό των τραπεζών που επηρεάζονται έμμεσα από τις μη συμβατικές πολιτικές, επίσης έχουν σχέση με την κερδοφορία.
description: The financial crisis of 2007 was the reason for the return of the academic interest to monetary policy in relation to bank profitability. Monetary policy of the European Central Bank (ECB) has now been diversified to meet the challenges posed by the financial crisis. In this paper, we investigate the relationship between unconventional monetary policy and bank profitability in the euro area. Using System GMM methodology in a sample of 13 eurozone countries, two key conclusions were drawn. The first is that there is a positive relationship between the slope of the yield curve and the profitability of banks. This relationship seems stronger when the yield curve is flatter. Secondly, equity in banks' balance sheet that is indirectly affected by unconventional policies is also related to bank profitability.
New Model of Internet Topology Using k-shell Decomposition
Creators: name: Carmi, Shai
name: Havlin, Shlomo
name: Kirkpatrick, Scott
name: Shavitt, Yuval
name: Shir, Eran
Publisher: name: arXiv
Year: 2006
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We introduce and use k-shell decomposition to investigate the topology of the Internet at the AS level. Our analysis separates the Internet into three sub-components: (a) a nucleus which is a small (~100 nodes) very well connected globally distributed subgraph; (b) a fractal sub-component that is able to connect the bulk of the Internet without congesting the nucleus, with self similar properties and critical exponents; and (c) dendrite-like structures, usually isolated nodes that are connected to the rest of the network through the nucleus only. This unique decomposition is robust, and provides insight into the underlying structure of the Internet and its functional consequences. Our approach is general and useful also when studying other complex networks.
description: 4 pages, 4 figures
Multi-step ahead prediction of lake water temperature using neural network and physically-based model
Creators: name: Chen, Chuqiang
name: Xue, Xinhua
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified

description: Deep learning (DL) is a powerful tool that has proven highly effective in many applications, but creating new deep learning models is becoming increasingly challenging. However, in some fields, such as fluid dynamics, theoretical models can help design powerful DL models. Based on the existing air2water (A2W) model, this paper proposes a hybrid neural network model, DL-A2W, which combines the long short-term memory (LSTM) neural network with the A2W model to predict lake water temperature. The DL-A2W model was established using the datasets of the UK Centre for Ecology & Hydrology, and the performance of the model was evaluated through three experiments. Compared with other models, the DL-A2W model has the lowest mean absolute error (MAE), mean absolute percent error (MAPE), root mean squared error (RMSE), and the highest Nash-Sutcliffe efficiency coefficient (NSC) at any given prediction step. The values of MAE, MAPE, RMSE and NSC of the DL-A2W model on the test set were 0.223–0.388, 1.946–3.296%, 0.375–0.647 and 0.985–0.995, respectively. The results show that the DL-A2W model has good generalization ability and portability, and can accurately perform multi-step ahead prediction of lake water temperature.
Exact training of Restricted Boltzmann machines on intrinsically low dimensional data
Creators: name: Decelle, Aurélien
name: Furtlehner, Cyril
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The restricted Boltzmann machine is a basic machine learning tool able, in principle, to model the distribution of some arbitrary dataset. Its standard training procedure appears however delicate and obscure in many respects. We bring some new insights to it by considering the situation where the data have low intrinsic dimension, offering the possibility of an exact treatment and revealing a fundamental failure of the standard training procedure. The reasons for this failure \textemdash~like the occurrence of first-order phase transitions during training~\textemdash \ are clarified thanks to a Coulomb interactions reformulation of the model. In addition a convex relaxation of the original optimization problem is formulated thereby resulting in a unique solution, obtained in precise numerical form on $d=1,2$ study cases, while a constrained linear regression solution can be conjectured on the basis of an information theory argument.
description: 13 pages, 6 Figures
Swift GRBs and the Ep,i - Eiso correlation
Creators: name: Amati, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Ep,i - Eiso correlation is one of the most intriguing and debated observational evidences in Gamma-Ray Bursts (GRB) astrophysics. Swift, with its high sensitivity and fast pointing capabilities, is reducing a lot the impact of selection effects in the sample of GRBs with known redshift (and thus Ep,i and Eiso). Moreover, in several cases it allows the detection of the soft tail of the prompt emission, and thus a more accurate estimate of Ep,i with respect to previous satellites. I present and discuss the location in the Ep,i - Eiso plane of Swift GRBs with known redshift and estimated Ep,i, showing that all long events (including peculiar events like GRB060218 and GRB060614) are consistent with the Ep,i - Eiso correlation. In contrast, short GRBs are not consistent with it, an evidence further supporting the hypothesis of different emission mechanisms at work in the two classes of GRBs. I also show, and briefly discuss, the intriguing evidence that the soft tail of the short GRB050724 is consistent with the correlation.
description: 6 pages, 3 figures, Il Nuovo Cimento C, in press (proceedings of "SWIFT and GRBs: Unveiling the Relativistic Universe", June 5-9, 2006 Venice (Italy)
Checking the transcription of "Verdena's Life Story, Part 2"
Creators: name: Parker, Verdena
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-080812-07 and VP-080812-08: Checking the transcription of Verdena's Life Story, Part 2 (file VP-041009-02).
The history of V. A. Rokhlin's ergodic seminar (1960--1970)
Creators: name: Vershik, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: History and Overview (math.HO)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A99

description: The paper tells about the main features and events of the ergodic seminar organized and headed by V.~A.~Rokhlin at the Leningrad State University. The seminar was active in {\rm1960--1970.\}
description: 15pp
Measuring dark energy with the shear triplet statistics
Creators: name: Sereno, Mauro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The shear triplet statistics is a geometric method to measure cosmological parameters with observations in the weak gravitational lensing regime towards massive haloes. Here, this proposal is considered to probe the dark energy equation of state and its time derivative in view of future wide-field galaxy surveys. A survey with a median redshift of nearly 0.7 and a total area of nearly 10000 square degrees would be pretty effective in determining the dark matter cosmological density and in putting useful constraints on the dark energy properties.
description: 5 pages, 3 figures, accepted for publication in MNRAS
Curing with hemlock: escaping the swampland using instabilities from string theory
Creators: name: Banerjee, Souvik
name: Danielsson, Ulf
name: Giri, Suvendu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this essay we will take a wonderful ride on a dark bubble with strings attached, which carries our universe out of the swampland and makes it realizable in the landscape of string theory. To find the way to the landscape, we make use of apparently hostile corners of the swampland and their instabilities.
description: This essay received an Honorable Mention in the 2021 Essay Competition of the Gravity Research Foundation
Fourth Plinth: Η σύγχρονη «μάχη» των εκθεμάτων στην πλατεία Trafalgar του Λονδίνου
Creators: name: Κεχαγιόγλου, Μαρία Διαμαντή
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Μουσειολογία
Δημόσια Τέχνη
Δημόσιος Χώρος
Museology
Public Art
Public Space

description: Αντικείμενο της εργασίας αποτελεί η βιβλιογραφική και ερευνητική ανασκόπηση για τη δημόσια τέχνη, με ειδική μελέτη περίπτωσης το “The Fourth Plinth Programme”, στην πλατεία Trafalgar του Λονδίνου. Το πρώτο κεφάλαιο περιλαμβάνει τη χρονολογική παράθεση των κύριων στοιχείων της ιστορικότητας της δημόσιας τέχνης στην Αμερική, συνδέοντας την πορεία της με αυτή του Ηνωμένου Βασιλείου. Στη συνέχεια, αποσαφηνίζονται οι απαραίτητοι ορισμοί, πάνω στους οποίους βασίζεται το πρόγραμμα. Οι ορισμοί περιλαμβάνουν το διευρυμένο πεδίο, την τοποειδική τέχνη, την εφήμερη παρέμβαση. Στο τέλος του πρώτου κεφαλαίου θα αναπτυχθεί ο ορισμός της δημόσιας τέχνης, η σχέση της με το μουσείο αλλά και με τη δημόσια σφαίρα. Στο δεύτερο κεφάλαιο μελετάται η νέα δημόσια τέχνη και το πως αυτή διαμορφώνεται τον 21ο αιώνα, απαντώντας στα ερωτήματα που δημιουργούνται. Το τρίτο κεφάλαιο θα εστιάσει στη μελέτη περίπτωσης αλλά αναγνώρισης τόσο του τόπου, όσο και του ίδιου του προγράμματος. Αναλύονται και παρουσιάζονται τα έργα που φιλοξενήθηκαν στην πλίνθο από το 1999 μέχρι και την ημερομηνία συγγραφής του έργου (Μάρτιος 2020). Τέλος, η εργασία ολοκληρώνεται με μια καταληκτική εξαγωγή συμπερασμάτων, βασισμένων στο θεωρητικό πλαίσιο των αρχικών κεφαλαίων και την ενδελεχή βιβλιογραφική έρευνα.
description: The subject of the elaborated work is the literature review and research on public art, focused on the special case study of "The Fourth Plinth Program", in London's Trafalgar Square. The first chapter contains a chronological review of the main elements of the history of public art in America, linking its evolution with that of the United Kingdom. The necessary definitions on which the program is based are then clarified; definitions that include expanded field, site specific art, temporary artwork. The conclusive part of this chapter contains the development of the definition of public art, its relation to the museum and the public sphere. The second chapter investigates the new public art and how it is shaped through the 21st century by answering the questions that arise. The third chapter focuses on the case study, identifying both the place and the program itself. The works hosted on the plinth from 1999 to the date of the project's writing (March 2020) are analyzed and presented. The work is completed with the extraction of compelling conclusions based on the theoretical framework of the initial chapters and the thorough bibliographic research.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)