cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Metaplectic formulation of the Wigner transform and applications
Creators: name: Dias, Nuno Costa
name: de Gosson, Maurice A.
name: Prata, João Nuno
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We show that the cross Wigner function can be written in the form $W(ψ, ϕ)= \hat S (ψ\otimes \overline{\hatϕ})$ where ${\hatϕ}$ is the Fourier transform of $ϕ$ and $\hat S$ is a metaplectic operator that projects onto a linear symplectomorphism $S$ consisting of a rotation along an ellipse in phase space (or in the time-frequency space). This formulation can be extended to generic Weyl symbols and yields an interesting fractional generalization of the Weyl-Wigner formalism. It also provides a suitable approach to study the Bopp phase space representation of quantum mechanics, familiar from deformation quantization. Using the "metaplectic formulation" of the Wigner transform we construct a complete set of intertwiners relating the Weyl and the Bopp pseudo-differential operators. This is an important result that allows us to prove the spectral and dynamical equivalence of the Schrödinger and the Bopp representations of quantum mechanics.
description: 18 pages, latex file
Doubly charged heavy leptons at LHC via contact interactions
Creators: name: Leonardi, R.
name: Panella, O.
name: Fanò, L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the production of doubly charged excited leptons at the LHC. These exotic states are predicted in extended weak isospin composite models. A recent analysis of such exotic states was based on a pure gauge model with magnetic type interactions. We include here the mechanism of contact interactions and show that this turns out to dominate the production of the doubly charged leptons. We perform a feasibility analysis of the observation of the tri-lepton signature associated with the production of the exotic doubly charged lepton simulating the response of a generic detector. We give exclusion plots in the parameter space, within statistical uncertainties, at different luminosities.
description: 10 pages, 8 figures, submitted for publication
FSpiNN: An Optimization Framework for Memory- and Energy-Efficient Spiking Neural Networks
Creators: name: Putra, Rachmad Vidya Wicaksana
name: Shafique, Muhammad
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Spiking Neural Networks (SNNs) are gaining interest due to their event-driven processing which potentially consumes low power/energy computations in hardware platforms, while offering unsupervised learning capability due to the spike-timing-dependent plasticity (STDP) rule. However, state-of-the-art SNNs require a large memory footprint to achieve high accuracy, thereby making them difficult to be deployed on embedded systems, for instance on battery-powered mobile devices and IoT Edge nodes. Towards this, we propose FSpiNN, an optimization framework for obtaining memory- and energy-efficient SNNs for training and inference processing, with unsupervised learning capability while maintaining accuracy. It is achieved by (1) reducing the computational requirements of neuronal and STDP operations, (2) improving the accuracy of STDP-based learning, (3) compressing the SNN through a fixed-point quantization, and (4) incorporating the memory and energy requirements in the optimization process. FSpiNN reduces the computational requirements by reducing the number of neuronal operations, the STDP-based synaptic weight updates, and the STDP complexity. To improve the accuracy of learning, FSpiNN employs timestep-based synaptic weight updates, and adaptively determines the STDP potentiation factor and the effective inhibition strength. The experimental results show that, as compared to the state-of-the-art work, FSpiNN achieves 7.5x memory saving, and improves the energy-efficiency by 3.5x on average for training and by 1.8x on average for inference, across MNIST and Fashion MNIST datasets, with no accuracy loss for a network with 4900 excitatory neurons, thereby enabling energy-efficient SNNs for edge devices/embedded systems.
description: To appear at the IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems (IEEE-TCAD), as part of the ESWEEK-TCAD Special Issue, September 2020
Etnografía para recuperar las experiencias periodísticas
Creators: name: De Leon, Salvador
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 470101
subject: Communication studies
classificationCode: 470105
subject: Journalism studies
classificationCode: 470107
subject: Media studies

description: Laetnografía a través de las entrevistas en profundidad y de la construcción de historias de vida es una herramienta potente para recuperar testimonios de periodistas veteranos y medios que permitan comprender, desde el interior de las empresas periodísticas, las condiciones que han llevado al periodismo de la región a su propia especificidad.
Tetragonal phase of epitaxial room-temperature antiferromagnet CuMnAs
Creators: name: Wadley, P.
name: Novák, V.
name: Campion, R. P.
name: Rinaldi, C.
name: Martí, X.
name: Reichlová, H.
name: Zelezný, J.
name: Gazquez, J.
name: Roldan, M. A.
name: Varela, M.
name: Khalyavin, D.
name: Langridge, S.
name: Kriegner, D.
name: Máca, F.
name: Masek, J.
name: Bertacco, R.
name: Holy, V.
name: Rushforth, A. W.
name: Edmonds, K. W.
name: Gallagher, B. L.
name: Foxon, C. T.
name: Wunderlich, J.
name: Jungwirth, T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent studies have demonstrated the potential of antiferromagnets as the active component in spintronic devices. This is in contrast to their current passive role as pinning layers in hard disk read heads and magnetic memories. Here we report the epitaxial growth of a new high-temperature antiferromagnetic material, tetragonal CuMnAs, which exhibits excellent crystal quality, chemical order and compatibility with existing semiconductor technologies. We demonstrate its growth on the III-V semiconductors GaAs and GaP, and show that the structure is also lattice matched to Si. Neutron diffraction shows collinear antiferromagnetic order with a high Neél temperature. Combined with our demonstration of room-temperature exchange coupling in a CuMnAs/Fe bilayer, we conclude that tetragonal CuMnAs films are suitable candidate materials for antiferromagnetic spintronics.
description: 16 pages, 5 figures, Published in Nature Communications (2013)
Two's Company, Three's a Crowd: Consensus-Halving for a Constant Number of Agents
Creators: name: Deligkas, Argyrios
name: Filos-Ratsikas, Aris
name: Hollender, Alexandros
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Computational Complexity (cs.CC)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We consider the $\varepsilon$-Consensus-Halving problem, in which a set of heterogeneous agents aim at dividing a continuous resource into two (not necessarily contiguous) portions that all of them simultaneously consider to be of approximately the same value (up to $\varepsilon$). This problem was recently shown to be PPA-complete, for $n$ agents and $n$ cuts, even for very simple valuation functions. In a quest to understand the root of the complexity of the problem, we consider the setting where there is only a constant number of agents, and we consider both the computational complexity and the query complexity of the problem. For agents with monotone valuation functions, we show a dichotomy: for two agents the problem is polynomial-time solvable, whereas for three or more agents it becomes PPA-complete. Similarly, we show that for two monotone agents the problem can be solved with polynomially-many queries, whereas for three or more agents, we provide exponential query complexity lower bounds. These results are enabled via an interesting connection to a monotone Borsuk-Ulam problem, which may be of independent interest. For agents with general valuations, we show that the problem is PPA-complete and admits exponential query complexity lower bounds, even for two agents.
description: Journal version
Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons asymmetrically terminated with hydrogen atoms
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: Using ab-initio methods we calculate thermoelectric and spin thermoelectric properties of silicene nanoribbons with bare, mono-hydrogenated and di-hydrogenated edges. Asymmetric structures, in which one edge is either bare or di-hydrogenated while the other edge is mono-hydrogenated (0H-1H and 2H-1H nanoribbons) have ferromagnetic ground state and display remarkable conventional and spin thermoelectric properties. Strong enhancement of the thermoelectric efficiency, both conventional and spin ones, results from a very specific band structure of such nanoribbons, where one spin channel is blocked due to an energy gap while the other spin channel is highly conducting. In turn, 0H-2H and 2H-2H nanoribbons (with one edge being either bare or di-hydrogenated and the other edge being di-hydrogenated) are antiferromagnetic in the ground state. Accordingly, the corresponding spin channels are equivalent, and only conventional thermoelectric effects can occur in these nanoribbons.
Unveiling the Structure of Barred Galaxies at 3.6 $μ{\rm m}$ with the Spitzer Survey of Stellar Structure in Galaxies (S$^4$G): I. Disk Breaks
Creators: name: Kim, Taehyun
name: Gadotti, Dimitri A.
name: Sheth, Kartik
name: Athanassoula, E.
name: Bosma, Albert
name: Lee, Myung Gyoon
name: Madore, Barry F.
name: Elmegreen, Bruce
name: Knapen, Johan H.
name: Zaritsky, Dennis
name: Ho, Luis C.
name: Comerón, Sébastien
name: Holwerda, Benne
name: Hinz, Joannah L.
name: Muñoz-Mateos, Juan-Carlos
name: Cisternas, Mauricio
name: Erroz-Ferrer, Santiago
name: Buta, Ron
name: Laurikainen, Eija
name: Salo, Heikki
name: Laine, Jarkko
name: Menéndez-Delmestre, Karín
name: Regan, Michael W.
name: de Swardt, Bonita
name: de Paz, Armando Gil
name: Seibert, Mark
name: Mizusawa, Trisha
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have performed two-dimensional multicomponent decomposition of 144 local barred spiral galaxies using 3.6 $μ{\rm m}$ images from the Spitzer Survey of Stellar Structure in Galaxies. Our model fit includes up to four components (bulge, disk, bar, and a point source) and, most importantly, takes into account disk breaks. We find that ignoring the disk break and using a single disk scale length in the model fit for Type II (down-bending) disk galaxies can lead to differences of 40% in the disk scale length, 10% in bulge-to-total luminosity ratio (B/T), and 25% in bar-to-total luminosity ratios. We find that for galaxies with B/T $\geq$ 0.1, the break radius to bar radius, $r_{\rm br}/R_{\rm bar}$, varies between 1 and 3, but as a function of B/T the ratio remains roughly constant. This suggests that in bulge-dominated galaxies the disk break is likely related to the outer Lindblad Resonance (OLR) of the bar, and thus moves outwards as the bar grows. For galaxies with small bulges, B/T $
description: Accepted for publication in ApJ, 21 pages, 13 figures, 2 tables
Generation of Spin-Adapted and Spin-Complete Substitution Operators for (High-Spin) Open-Shell Coupled Cluster of Arbitrary Order
Creators: name: Herrmann, Nils
name: Hanrath, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A rigorous generation of spin-adapted (spin-free) substitution operators for high spin ($S=S_z$) references of arbitrary substitution order and spin quantum number $S$ is presented. The generated operators lead to linearly independent but non-orthogonal CSFs when applied to the reference and span the complete spin space. To incorporate spin completeness, spectating substitutions (as e.g. $\hat{E}_{iv}^{va}$) are introduced. The presented procedure utilizes Löwdin's projection operator method of spin eigenfunction generation to ensure spin completeness. The generated operators are explicitly checked for (i) their linear independence and (ii) their spin completeness for up to 10-fold substitutions and up to a multiplicity of $2S+1 = 11$. A proof of concept implementation utilizing the generated operators in a coupled cluster (CC) calculation was successfully applied to the high spin states of the Boron atom. The results show pure spin states as well as small effects on the correlation energy compared to spinorbital CC. A comparison to spin-adapted but spin-incomplete CC shows a significant spin incompleteness error.
description: 18 pages, 5 figures, 5 tables
Pure pairs. IV. Trees in bipartite graphs
Creators: name: Scott, Alex
name: Seymour, Paul
name: Spirkl, Sophie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper we investigate the bipartite analogue of the strong Erdos-Hajnal property. We prove that for every forest $H$ and every $τ>0$ there exists $ε>0$, such that if $G$ has a bipartition $(A,B)$ and does not contain $H$ as an induced subgraph, and has at most $(1-τ)|A|\cdot|B|$ edges, then there is a stable set in $G$ that contains at least $ε|V_i|$ vertices of $V_i$, for $i=1,2$. No graphs $H$ except forests have this property.
description: Accepted manuscript; see DOI for journal version
Vector Rogue Waves and Baseband Modulation Instability in the Defocusing Regime
Creators: name: Baronio, Fabio
name: Conforti, Matteo
name: Degasperis, Antonio
name: Lombardo, Sara
name: Onorato, Miguel
name: Wabnitz, Stefan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report and discuss analytical solutions of the vector nonlinear Schrödinger equation that describe rogue waves in the defocusing regime. This family of solutions includes bright-dark and dark-dark rogue waves. The link between modulational instability (MI) and rogue waves is displayed by showing that only a peculiar kind of MI, namely baseband MI, can sustain rogue wave formation. The existence of vector rogue waves in the defocusing regime is expected to be a crucial progress in explaining extreme waves in a variety of physical scenarios described by multi-component systems, from oceanography to optics and plasma physics.
An implementation on detection of trusted service provider in mobile ad-hoc networks
Creators: name: Jichkar, Mr. Rahul A
name: Chandak, Dr. M. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The mobile ad-hoc network consists of energy constraint devices called nodes communicating through radio signals forming a temporary network i.e. nodes are continuously switching from one network to another. To minimize the power consumption, we form the clusters with an elected cluster head (Service Provider) based on any cluster head selection strategy.To establish a trusted link amongst newly entered node and CH we have adopted an indirect trust computation technique based on recommendations, which form an important component in trust-based access control models for pervasive environment.In this paper, we shall present some existing indirect trust based techniques and subsequently discuss our proposal along with its merits and future scope.
description: 12 pages, 30 figures, Published with International Journal of Engineering Trends and Technology (IJETT)
Navigating the massive world of reddit: Using backbone networks to map user interests in social media
Creators: name: Olson, Randal S.
name: Neal, Zachary P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In the massive online worlds of social media, users frequently rely on organizing themselves around specific topics of interest to find and engage with like-minded people. However, navigating these massive worlds and finding topics of specific interest often proves difficult because the worlds are mostly organized haphazardly, leaving users to find relevant interests by word of mouth or using a basic search feature. Here, we report on a method using the backbone of a network to create a map of the primary topics of interest in any social network. To demonstrate the method, we build an interest map for the social news web site reddit and show how such a map could be used to navigate a social media world. Moreover, we analyze the network properties of the reddit social network and find that it has a scale-free, small-world, and modular community structure, much like other online social networks such as Facebook and Twitter. We suggest that the integration of interest maps into popular social media platforms will assist users in organizing themselves into more specific interest groups, which will help alleviate the overcrowding effect often observed in large online communities.
description: 10 pages, 3 figures, 1 table, 1 supplementary information page
The Complexity of Gradient Descent: CLS = PPAD $\cap$ PLS
Creators: name: Fearnley, John
name: Goldberg, Paul W.
name: Hollender, Alexandros
name: Savani, Rahul
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Complexity (cs.CC)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We study search problems that can be solved by performing Gradient Descent on a bounded convex polytopal domain and show that this class is equal to the intersection of two well-known classes: PPAD and PLS. As our main underlying technical contribution, we show that computing a Karush-Kuhn-Tucker (KKT) point of a continuously differentiable function over the domain $[0,1]^2$ is PPAD $\cap$ PLS-complete. This is the first non-artificial problem to be shown complete for this class. Our results also imply that the class CLS (Continuous Local Search) - which was defined by Daskalakis and Papadimitriou as a more "natural" counterpart to PPAD $\cap$ PLS and contains many interesting problems - is itself equal to PPAD $\cap$ PLS.
description: Journal version
Compactness and existence results in weighted Sobolev spaces of radial functions, Part I: Compactness
Creators: name: Badiale, Marino
name: Guida, Michela
name: Rolando, Sergio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary 46E35, Secondary 46E30, 35J60, 35J20, 35J05

description: Given two measurable functions $V(r)\geq 0$ and $K(r)> 0$, $r>0$, we define the weighted spaces \[ H_V^1 = \{u \in D^{1,2}(\mathbb{R}^N): \int_{\mathbb{R}^N}V(|x|)u^{2}dx < \infty \}, \quad L_K^q = L^q(\mathbb{R}^N,K(|x|)dx) \] and study the compact embeddings of the radial subspace of $H_V^1$ into $L_K^{q_1}+L_K^{q_2}$, and thus into $L_K^q$ ($=L_K^q+L_K^q$) as a particular case. Both super- and sub-quadratic exponents $q_1$, $q_2$ and $q$ are considered. Our results do not require any compatibility between how the potentials $V$ and $K$ behave at the origin and at infinity, and essentially rely on power type estimates of their relative growth, not of the potentials separately. Applications to existence results for nonlinear elliptic problems like \[ -\triangle u + V(|x|)u = f(|x|,u) \quad \text{in}\mathbb{R}^N, \quad u \in H_V^1, \] will be given in a forthcoming paper.
description: 42 pages, 5 figures
Foundations of the Variational Discrete Action Theory
Creators: name: Cheng, Zhengqian
name: Marianetti, Chris A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Variational wave functions and Green's functions are two important paradigms for solving quantum Hamiltonians, each having their own advantages. Here we detail the Variational Discrete Action Theory (VDAT), which exploits the advantages of both paradigms in order to approximately solve the ground state of quantum Hamiltonians. VDAT consists of two central components: the sequential product density matrix (SPD) ansatz and a discrete action associated with the SPD. The SPD is a variational ansatz inspired by the Trotter decomposition and characterized by an integer $\mathcal{N}$, recovering many well known variational wave functions, in addition to the exact solution for $\mathcal{N}=\infty$. The discrete action describes all dynamical information of an effective integer time evolution with respect to the SPD. We generalize the path integral to our integer time formalism, which converts a dynamic correlation function in integer time to a static correlation function in a compound space. We also generalize the usual many-body Green's function formalism to integer time, which results in analogous but distinct mathematical structures, yielding integer time versions of the generating functional, Dyson equation, and Bethe-Salpeter equation. We prove that the SPD can be exactly evaluated in the multi-band Anderson impurity model (AIM) by summing a finite number of diagrams. For the multi-band Hubbard model, we prove that the self-consistent canonical discrete action approximation (SCDA), which is the integer time analogue of the dynamical mean-field theory, exactly evaluates the SPD for $d=\infty$. VDAT within the SCDA provides an efficient yet reliable method for capturing the local physics of quantum lattice models, which will have broad applications for strongly correlated electron materials. More generally, VDAT should find applications in various many-body problems in physics.
description: 30 pages, 9 figures. Fixed the typo of Eq (125) in PRB version (i.e the order of applying two creation operators has been reversed in PRB version.)
A quantile-based probabilistic mean value theorem
Creators: name: Di Crescenzo, Antonio
name: Martinucci, Barbara
name: Mulero, Julio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: For nonnegative random variables with finite means we introduce an analogous of the equilibrium residual-lifetime distribution based on the quantile function. This allows to construct new distributions with support (0,1), and to obtain a new quantile-based version of the probabilistic generalization of Taylor's theorem. Similarly, for pairs of stochastically ordered random variables we come to a new quantile-based form of the probabilistic mean value theorem. The latter involves a distribution that generalizes the Lorenz curve. We investigate the special case of proportional quantile functions and apply the given results to various models based on classes of distributions and measures of risk theory. Motivated by some stochastic comparisons, we also introduce the `expected reversed proportional shortfall order', and a new characterization of random lifetimes involving the reversed hazard rate function.
description: 21 pages, 3 figures, submitted for publication
The ACTIONFINDER: An unsupervised deep learning algorithm for calculating actions and the acceleration field from a set of orbit segments
Creators: name: Ibata, Rodrigo
name: Diakogiannis, Foivos
name: Famaey, Benoit
name: Monari, Giacomo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We introduce the "ACTIONFINDER", a deep learning algorithm designed to transform a sample of phase-space measurements along orbits in a static potential into action and angle coordinates. The algorithm finds the mapping from positions and velocities to actions and angles in an unsupervised way, by using the fact that points along the same orbit have identical actions. Here we present the workings of the method, and test it on simple axisymmetric models, comparing the derived actions to those generated with the Torus Mapping technique. We show that it recovers the Torus actions for halo-type orbits in a realistic model of the Milky Way to $\sim 0.6$% accuracy with as few as 1024 input phase-space measurements. These actions are much better conserved along orbits than those estimated with the Stäckel fudge. In our case, the reciprocal mapping from actions and angles to positions and velocities can also be learned. One of the advantages of the ACTIONFINDER is that it does not require the underlying potential to be known in advance, indeed it is designed to return the acceleration field. We expect the algorithm to be useful for analysing the properties of dynamical systems in numerical simulations. However, our ultimate goal with this effort will be to apply it to real stellar streams to recover the Galactic acceleration field in a way that is relatively agnostic about the underlying dark matter properties or the behavior of gravity.
description: 17 pages, 5 figures, accepted by ApJ. The revision shows that the method works well on test orbits defined by Sanders & Binney (2016), as well as on the output of an N-body simulation
Strong converse for the quantum capacity of the erasure channel for almost all codes
Creators: name: Wilde, Mark M.
name: Winter, Andreas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A strong converse theorem for channel capacity establishes that the error probability in any communication scheme for a given channel necessarily tends to one if the rate of communication exceeds the channel's capacity. Establishing such a theorem for the quantum capacity of degradable channels has been an elusive task, with the strongest progress so far being a so-called "pretty strong converse". In this work, Morgan and Winter proved that the quantum error of any quantum communication scheme for a given degradable channel converges to a value larger than $1/\sqrt{2}$ in the limit of many channel uses if the quantum rate of communication exceeds the channel's quantum capacity. The present paper establishes a theorem that is a counterpart to this "pretty strong converse". We prove that the large fraction of codes having a rate exceeding the erasure channel's quantum capacity have a quantum error tending to one in the limit of many channel uses. Thus, our work adds to the body of evidence that a fully strong converse theorem should hold for the quantum capacity of the erasure channel. As a side result, we prove that the classical capacity of the quantum erasure channel obeys the strong converse property.
description: 15 pages, submission to the 9th Conference on the Theory of Quantum Computation, Communication, and Cryptography (TQC 2014)
ASSESSMENT OF WATER MANAGEMENT PRACTICES IN SELECTED SMALL SCALE IRRIGATION SCHEMES: CASE STUDY OF WOTER-02, ARARA AND HAJIFEJA SCHEMES IN EAST HARARGHE ZONE
Creators: name: ABDI ABDULKADIR SEID
Publisher: name: Zenodo
Year: 2015

description: This study was initiated to evaluate the performance of three small-scale irrigation schemes found in

Qersa district, namely, Arara, Woter-02 and Hajifaja schemes using selected performance indices. The

technical evaluation was made by measuring selected performance indicators such as conveyance

efficiency, application efficiency, scheme efficiency and performance indicators such as water

productivity and land productivity. Moreover, water management practices and dependability of the

irrigation interval was also investigated through a questionnaire of the sample household survey. Overall

activities in primary data collected included: field observation, interviewing beneficiary farmers, soil

sample taking and discharge measurements in the canals. In addition to the primary data, secondary data

such as meteorological data and agricultural production were collected from the secondary sources from

zonal and Woreda irrigation development office and DA of PA and other respective offices.
Weighted Reed-Solomon convolutional codes
Creators: name: Alfarano, Gianira N.
name: Napp, Diego
name: Neri, Alessandro
name: Requena, Verónica
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences
subject: 15B33, 94B10, 15B05, 11T71

description: In this paper we present a concrete algebraic construction of a novel class of convolutional codes. These codes are built upon generalized Vandermonde matrices and therefore can be seen as a natural extension of Reed-Solomon block codes to the context of convolutional codes. For this reason we call them weighted Reed-Solomon (WRS) convolutional codes. We show that under some constraints on the defining parameters these codes are Maximum Distance Profile (MDP), which means that they have the maximal possible growth in their column distance profile. We study the size of the field needed to obtain WRS convolutional codes which are MDP and compare it with the existing general constructions of MDP convolutional codes in the literature, showing that in many cases WRS convolutional codes require significantly smaller fields.
description: Published in Linear and Multilinear Algebra
Come risolvere con Excel per via grafica approssimata equazioni, derivate, integrali definiti". Un metodo alternativo a Maple, Wiris, Geogebra, etc. ( per commenti)
Creators: name: Rocco MORELLI
Publisher: name: Zenodo
Year: 2022
Subjects: Utilizzo di Excel

description: Utilizzo non convenzionale di Microsoft Excel
description: Vedi anche
http://roccomorelli.blogspot.com/2022/07/a-tommaso-per-commenti-e-correzioni.html
Designing copyright laws to combat digital piracy and effectively balance proprietary and public interests in Bangladesh
Creators: name: Rahman, Muhammed Atiqur
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: The increasing incidence of digital piracy using internet technologies has prompted nations around the world to amend their copyright laws to more appropriately balance the protection of the proprietorial rights of copyright owners with the public right to access to knowledge. Since the inception of the copyright law, such amendments of legislation have been commensurate with technological invention. However, in recent years, the rapid and the continuously evolving nature of digital technologies has made this process of law reform significantly more challenging. Moreover, as knowledge has a critical role in economic growth in the information age and enhances human capabilities for both the cultural and social development, a developing nation such as Bangladesh faces significant challenges in designing effective digital copyright laws. Rampant piracy of copyrighted goods, such as almost 90% in case of software and 100% in sound recording or books or movies, have significantly escalated with the increased access to digital technologies in Bangladesh. Consequently, while Bangladesh is required to enact laws to protect digital copyright in order to advance economic growth and fulfil its vision of becoming ‘Digital Bangladesh’, it also needs to provide wider access to online contents to increase the knowledge and capability of its citizens. In such a context, the central research question to be addressed by this thesis is how can Bangladesh expand its knowledge base and fulfil its developmental goals by enacting digital copyright laws that effectively balance the protection of the interest of copyright owners with the public’s need to access to knowledge. In order to address this central research question applying doctrinal, comparative and normative methodologies, the thesis has analysed the public policy basis of digital copyright law, considered the human right to access to knowledge, examined the existing copyright laws of Bangladesh and analysed the merits of Australian and the USA laws in this area. Based on this critical analysis, the research recommends that Bangladesh is required to enact digital copyright law, amending in key areas of current copyright law, to effectively balance the competing interests of copyright owners and the wider public.
AdS to dS phase transition mediated by thermalon in Einstein-Gauss-Bonnet gravity from Renyi statistics
Creators: name: Samart, Daris
name: Channuie, Phongpichit
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we present the possible existence of a thermalon phase transition between anti-de Sitter (AdS) to de Sitter (dS) vacua in Einstein-Gauss-Bonnet gravity by considering the Rényi statistics. A thermalon changes the asymptotic structure of spacetimes via the bubble nucleation of spherical thin-shells which host a black hole in the interior. All relevant thermodynamical quantities are computed in terms of the Renyi statistics in order to demonstrate the possible existence of the AdS to dS phase transition. In addition, we also comment on the behaviors of the phase transitions in the Renyi statistics.
description: v2: version accepted for publication in Nucl. Phys. B
TURIZM IMKONIYATLARI ORTAYOTGAN DAVRDA EKOLOGIK TURIZMNI RIVOJLANTIRISHNING IQTISODIYOTDAGI AHAMIYATI.
Creators: name: Olimjonova, Farog'at
Publisher: name: Zenodo
Year: 2024

description: Maqolada ekoligik turizmning iqtisodiy rivojlanishdagi ahamiyati, turizm sohasini rivojlantirish bo’yicha amalga oshirilayotgan ishlar tahlil etilgan. Rivojlangan mamlakatlarning huquqiy qiyosiy tahlillari hamda ilg’or tajribasi asosida yurtimizda turizmni rivojlantirish bo’yicha takliflar keltirilgan.
On extremals of the entropy production by "Langevin-Kramers" dynamics
Creators: name: Muratore-Ginanneschi, Paolo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We refer as "Langevin-Kramers" dynamics to a class of stochastic differential systems exhibiting a degenerate "metriplectic" structure. This means that the drift field can be decomposed into a symplectic and a gradient-like component with respect to a pseudo-metric tensor associated to random fluctuations affecting increments of only a sub-set of the degrees of freedom. Systems in this class are often encountered in applications as elementary models of Hamiltonian dynamics in an heat bath eventually relaxing to a Boltzmann steady state. Entropy production control in Langevin-Kramers models differs from the now well-understood case of Langevin-Smoluchowski dynamics for two reasons. First, the definition of entropy production stemming from fluctuation theorems specifies a cost functional which does not act coercively on all degrees of freedom of control protocols. Second, the presence of a symplectic structure imposes a non-local constraint on the class of admissible controls. Using Pontryagin control theory and restricting the attention to additive noise, we show that smooth protocols attaining extremal values of the entropy production appear generically in continuous parametric families as a consequence of a trade-off between smoothness of the admissible protocols and non-coercivity of the cost functional. Uniqueness is, however, always recovered in the over-damped limit as extremal equations reduce at leading order to the Monge-Ampère-Kantorovich optimal mass transport equations.
description: 28 pages, 2 figures
Type-Based Analysis of Logarithmic Amortised Complexity
Creators: name: Hofmann, Martin
name: Leutgeb, Lorenz
name: Moser, Georg
name: Obwaller, David
name: Zuleger, Florian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences
subject: F.3.2

description: We introduce a novel amortised resource analysis couched in a type-and-effect system. Our analysis is formulated in terms of the physicist's method of amortised analysis, and is potential-based. The type system makes use of logarithmic potential functions and is the first such system to exhibit *logarithmic amortised complexity*. With our approach we target the automated analysis of self-adjusting data structures, like splay trees, which so far have only manually been analysed in the literature. In particular, we have implemented a semi-automated prototype, which successfully analyses the zig-zig case of *splaying*, once the type annotations are fixed.
description: 35 pages. arXiv admin note: text overlap with arXiv:1807.08242
Hallmarks of diabetes mellitus and insights into the therapeutic potential of synergy-based combinations of phytochemicals in reducing oxidative stress-induced diabetic complications
Creators: name: Dar, Mohammad Irfan
name: Gulya, Anu
name: Abass, Sageer
name: Dev, Kapil
name: Parveen, Rabea
name: Ahmad, Sayeed
name: Qureshi, Mohammad Irfan
Publisher: name: Taylor & Francis
Year: 2024
Subjects: Biochemistry
Medicine
Molecular Biology
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Cancer
Computational Biology

description: Diabetes mellitus (DM) is a serious health issue and is still one of the major causes of mortality around the globe. Natural products have progressively integrated into modern, advanced medical practices. Phytoconstituents from some medicinal plants have demonstrated therapeutic activity in treating different metabolic disorders and have been used to treat DM and its severe complications. The present review provides details of the major anti-diabetic targets identified in the literature and also provides comprehensive information regarding the therapeutic role of a synergy-based combination of phytoconstituents that functions by controlling specific molecular pathways synchronously by inhibiting certain key regulators involved in the development and progression of DM. The review also implicated the role of oxidative stress in diabetic complications and presented scientific validations of phytochemicals and their synergy-based combination using in vitro and or in vivo approaches.
Behavior of nanoparticle clouds around a magnetized microsphere under magnetic and flow fields
Creators: name: Magnet, Cécilia
name: Kuzhir, Pavel
name: Bossis, Georges
name: Meunier, Alain
name: Nave, Sebastien
name: Zubarev, Andrey
name: Lomenech, Claire
name: Bashtovoi, Victor
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: When a micron-sized magnetizable particle is introduced into a suspension of nanosized magnetic particles, the nanoparticles accumulate around the microparticle and form thick anisotropic clouds extended in the direction of the applied magnetic field. This phenomenon promotes colloidal stabilization of bimodal magnetic suspensions and allows efficient magnetic separation of nanoparticles used in bioanalysis and water purification. In the present work, size and shape of nanoparticle clouds under the simultaneous action of an external uniform magnetic field and the flow have been studied in details. In experiments, dilute suspension of iron oxide nanoclusters (of a mean diameter of 60 nm) was pushed through a thin slit channel with the nickel microspheres (of a mean diameter of 50$μ$m) attached to the channel wall. The behavior of nanocluster clouds was observed in the steady state using an optical microscope. In the presence of strong enough flow, the size of the clouds monotonically decreases with increasing flow speed in both longitudinal and transverse magnetic fields. This is qualitatively explained by enhancement of hydrodynamic forces washing the nanoclusters away from the clouds. In the longitudinal field, the flow induces asymmetry of the front and the back clouds. To explain the flow and the field effects on the clouds, we have developed a simple model based on the balance of the stresses and particle fluxes on the cloud surface. This model, applied to the case of the magnetic field parallel to the flow, captures reasonably well the flow effect on the size and shape of the cloud and reveals that the only dimensionless parameter governing the cloud size is the ratio of hydrodynamic-to-magnetic forces - the Mason number. At strong magnetic interactions considered in the present work (dipolar coupling parameter $α\geq 2$), the Brownian motion seems not to affect the cloud behavior.
Facet classification: Exploring the boundaries between theory and methodology
Creators: name: Broughton, Vanda
Publisher: name: ISKO UK
Year: 2013
Subjects: Facet classification
Facet analysis
KOS development
Classification schemes

description: Although facet analysis is a long established  approach to information organization, and 'it has dominated what has be termed "modern classification theory"', doubt has been cast on whether it is a true theory of information science, or merely a sophisticated methodology for its organization and management.  The paper will examine the extent to which a case can be made for the theoretical validity of facet analysis, and, to a lesser degree, what features distinguish classification research proper from a strictly practical process of compiling subject retrieval tools.
Although it can be argued that facet analysis is to a degree pragmatically derived, it is based on logical principles, and the structures created by it can be represented in formal languages; that characteristic, and Ranganathan's mathematical education and mode of thought, give it some credibility as a scientific theory. 
Nevertheless the basis for the identification and selection of fundamental categories is more intuitive, and it has elements in common with social science research tools, such as grounded theory.  The relationship between faceted classification and grounded theory has already been discussed, but without reference to contemporary interpretations of facet analysis, which will be examined here.  The use of classification as a form of content analysis which helps to expose theory in other domains has also been explored and it seems profitable to take further the idea that a methodology of this kind is necessarily a theory in its own right.
Helmholtz decomposition and potential functions for n-dimensional analytic vector fields
Creators: name: Glötzl, Erhard
name: Richters, Oliver
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: G.1.8; G.1.9
subject: 35J05 (Primary) 35Q99, 31B99 (Secondary)

description: The Helmholtz decomposition splits a sufficiently smooth vector field into a gradient field and a divergence-free rotation field. Existing decomposition methods impose constraints on the behavior of vector fields at infinity and require solving convolution integrals over the entire coordinate space. To allow a Helmholtz decomposition in $\mathbb{R}^n$, we replace the vector potential in $\mathbb{R}^3$ by the rotation potential, an n-dimensional, antisymmetric matrix-valued map describing $n(n-1)/2$ rotations within the coordinate planes. We provide three methods to derive the Helmholtz decomposition: (1) a numerical method for fields decaying at infinity by using an $n$-dimensional convolution integral, (2) closed-form solutions using line-integrals for several unboundedly growing fields including periodic and exponential functions, multivariate polynomials and their linear combinations, (3) an existence proof for all analytic vector fields. Examples include the Lorenz and Rössler attractor and the competitive Lotka-Volterra equations with $n$ species.
description: v1: 15 pages, 1 figure -- v2: 17 pages. Improved structure, added method to numerically calculate potential matrix for decaying fields, additional corollaries for special cases, more examples -- v3: 20 pages, 2 figures. Generalized proofs, explicitly formulated strategy for various vector fields, existence proof of Helmholtz decomposition for all analytic vector fields
Percepção pela visão do desenvolvedor
Creators: name: Josue.Resende@Edu.Unirio.Br
name: Thiago.M.Ribeiro@Edu.Unirio.Br
name: Barbara.Ribeiro@Edu.Unirio.Br
Publisher: name: Zenodo
Year: 2022

description: Lista de vieses cognitivos utilizados, descrição e referências.
SparkXD: A Framework for Resilient and Energy-Efficient Spiking Neural Network Inference using Approximate DRAM
Creators: name: Putra, Rachmad Vidya Wicaksana
name: Hanif, Muhammad Abdullah
name: Shafique, Muhammad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Hardware Architecture (cs.AR)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Spiking Neural Networks (SNNs) have the potential for achieving low energy consumption due to their biologically sparse computation. Several studies have shown that the off-chip memory (DRAM) accesses are the most energy-consuming operations in SNN processing. However, state-of-the-art in SNN systems do not optimize the DRAM energy-per-access, thereby hindering achieving high energy-efficiency. To substantially minimize the DRAM energy-per-access, a key knob is to reduce the DRAM supply voltage but this may lead to DRAM errors (i.e., the so-called approximate DRAM). Towards this, we propose SparkXD, a novel framework that provides a comprehensive conjoint solution for resilient and energy-efficient SNN inference using low-power DRAMs subjected to voltage-induced errors. The key mechanisms of SparkXD are: (1) improving the SNN error tolerance through fault-aware training that considers bit errors from approximate DRAM, (2) analyzing the error tolerance of the improved SNN model to find the maximum tolerable bit error rate (BER) that meets the targeted accuracy constraint, and (3) energy-efficient DRAM data mapping for the resilient SNN model that maps the weights in the appropriate DRAM location to minimize the DRAM access energy. Through these mechanisms, SparkXD mitigates the negative impact of DRAM (approximation) errors, and provides the required accuracy. The experimental results show that, for a target accuracy within 1% of the baseline design (i.e., SNN without DRAM errors), SparkXD reduces the DRAM energy by ca. 40% on average across different network sizes.
description: To appear at the 58th IEEE/ACM Design Automation Conference (DAC), December 2021, San Francisco, CA, USA