cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Quantum Hopfield Associative Memory Implemented on an Actual Quantum Processor
Creators: name: Miller, Nathan Eli
name: Mukhopadhyay, Saibal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this work, we present a Quantum Hopfield Associative Memory (QHAM) and demonstrate its capabilities in simulation and hardware using IBM Quantum Experience. The QHAM is based on a quantum neuron design which can be utilized for many different machine learning applications and can be implemented on real quantum hardware without requiring mid-circuit measurement or reset operations. We analyze the accuracy of the neuron and the full QHAM considering hardware errors via simulation with hardware noise models as well as with implementation on the 15-qubit ibmq_16_melbourne device. The quantum neuron and the QHAM are shown to be resilient to noise and require low qubit overhead and gate complexity. We benchmark the QHAM by testing its effective memory capacity and demonstrate its capabilities in the NISQ-era of quantum hardware. This demonstration of the first functional QHAM to be implemented in NISQ-era quantum hardware is a significant step in machine learning at the leading edge of quantum computing.
description: This work is now published in Sci. Rep. at https://doi.org/10.1038/s41598-021-02866-z. The e-print version shown here is 17 pages (13 for the main manuscript, 4 for the supplementary information), with a total of 11 figures and 3 tables. Figure S2 has been added since the prior pre-print version
Quantum mechanics on manifolds and topological effects
Creators: name: Morchio, G.
name: Strocchi, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81Q70; 81R15; 81R10

description: A unique classification of the topological effects associated to quantum mechanics on manifolds is obtained on the basis of the invariance under diffeomorphisms and the realization of the Lie-Rinehart relations between the generators of the diffeomorphism group and the algebra of infinitely differentiable functions on the manifold. This leads to a unique ("Lie-Rinehart") C* algebra as observable algebra; its regular representations are shown to be locally Schroedinger and in one to one correspondence with the unitary representations of the fundamental group of the manifold. Therefore, in the absence of spin degrees of freedom and external fields, the first homotopy group of the manifold appears as the only source of topological effects.
description: A few comments have been added to the Introduction, together with related references; a few words have been changed in the Abstract and a Note added to the Title
Этноэкологические аспекты проблемы опустынивания в регионах традиционного пастбищного скотоводства в рамках курса «Региональная экология»
Creators: name: А.Н., Ямсков
Publisher: name: Zenodo
Year: 2010
Subjects: традиционное скотоводство, перевыпас, опустынивание, пастбищная дигрессия

description: В статье перечислены и кратко охарактеризованы потенциально возможные социо-культурные причины, которые могут приводить к перевыпасу пастбищ в рамках традиционных (кочевых и пастушеских) систем скотоводства, что в условиях аридного или семиаридного климата обычно вызывает антропогенное опустынивание территории.
Tytthosoceros lizardensis Newman and Cannon 1996
Creators: name: Khalili, Zahra
name: Rahimian, Hassan
name: Pazooki, Jamile
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Trepaxonemata
Polycladida
Pseudocerotidae
Tytthosoceros
Tytthosoceros lizardensis

description: Tytthosoceros lizardensis Newman and Cannon 1996 Type location: Heron Island, southern Great Barrier Reef, Australia. Type specimen: Queensland Museum, Brisbane, Australia WM QM (G 210716). Specimens examined: ZUTC Platy 1001, 1002. Fifty-six specimens of this species were collected from two locations (Stations No. 1 and 2, Fig. 1, Table 1). Most specimens were found in groups of up to 20 individuals, under rubble in intertidal pools, and on an orange sponge (Clione vastifera). Most specimens autolysed during sampling or fixation and only four specimens remained intact after fixation procedure. The following description is based on those four specimens. Description. Sizes of specimens range from 22 × 38 to 30 × 46 mm; background color variable, mottled light brown or olive green with cream mottling composed of dots, forming loose transverse streaks medially and laterally, darker medially sometimes with a tinge of light brown medially and on the pseudotentacles; narrow marginal bands, black then grey interrupted with short white transverse streaks of microdots at rim; submargin narrow, either cream or transparent grey (Fig. 2); pseudotentacles earlike, small, cream with mottling of light brown or olive between (Fig. 3); 70–80 cerebral eyes, arranged like a horseshoe, dorsal pseudotentaclular eyes, scattered, with about 35 eyes (Figs 3 and 4); ventral surface of specimens cream with black rims, and very ruffled margins; anterior pharynx large and ruffled, 1/5 of the body length (8.6 mm), associated with 5–6 pairs of pharyngeal folds; mouth situated in the middle of the pharynx (Fig. 6C); intestine extending posteriorly, but not to the margin of the body; male and female gonopores posterior to pharynx, distinct sucker in mid-body proper (Fig. 5). Anatomy of Reproductive System (Figs 6A, B, 7). Testes scattered throughout the body, vas deferens forming a network of thin tubes; single male copulatory apparatus with rounded-oblong seminal vesicle (456 × 336 µm), oval prostate oriented anterodorsally (120 × 96 µm), deep male antrum (192 µm), penis papilla with short stylet (120 × 72 µm); female copulatory apparatus with wide female atrium (120 µm) and cement glands.
description: Published as part of Khalili, Zahra, Rahimian, Hassan & Pazooki, Jamile, 2009, First record of the family Pseudocerotidae (Platyhelminthes, Polycladida, Cotylea) from the Persian Gulf, Iran, pp. 39-51 in ZooKeys 31 (3) on pages 41-43, DOI: 10.3897/zookeys.31.136, http://zenodo.org/record/576580
Voltage induced optical waveguide modulators in lithium niobate
Creators: name: Jaeger, Nicolas August Fleming
Publisher: name: University of British Columbia
Year: 2010

description: Two types of optical modulator were studied, both of the voltage induced optical waveguide type first proposed and demonstrated by Channin in 1971. An optical waveguide was created in an electrooptic substrate by applying voltage between two electrodes deposited on the substrate. Channin used wide electrode spacings which resulted in large operating voltages being necessary. The devices discussed in this thesis had much smaller electrode spacings and therefore operated at much reduced voltages. They are of the planar and ridge types. In the planar type the electrodes were deposited on top of a planar substrate and in the ridge type a ridge of electrooptic material separated thick electrodes. The theory of operation for both types of device was developed and they were modeled, fabricated, and tested. Numerically derived results were obtained for light with wavelengths of 442 and 633 nm which showed that the confinement of the light increased with increasing voltage, decreasing gap width, and decreasing wavelength. The theory was further developed to investigate the performance of the device as a voltage-controlled linking waveguide between two optical fibers. The optimum coupling efficiency, as a function of voltage and interelectrode gap width, from optical fibers to both types of device was calculated in terms of the model. Key aspects of the theory were confirmed by the measurements made on the fabricated devices. A planar device was used as a front-end switch between a laser and an optical fiber using a V-groove etched in silicon to align the voltage induced waveguide with the fiber. One problem was a decay phenomenon in which the induced waveguide disappeared over a period of time during which a constant voltage was applied to the electrodes. This was believed to be due to the photorefractive effect. It was found that the device would recover upon the application of a fly-back cycle.
New Angle on the Strong CP and Chiral Symmetry Problems from a Rotating Mass Matrix
Creators: name: Bordes, Jose
name: Chan, H. M.
name: Tsou, S. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is shown that when the mass matrix changes in orientation (rotates) in generation space for changing energy scale, then the masses of the lower generations are not given just by its eigenvalues. In particular, these masses need not be zero even when the eigenvalues are zero. In that case, the strong CP problem can be avoided by removing the unwanted $θ$ term by a chiral transformation in no contradiction with the nonvanishing quark masses experimentally observed. Similarly, a rotating mass matrix may shed new light on the problem of chiral symmetry breaking. That the fermion mass matrix may so rotate with scale has been suggested before as a possible explanation for up-down fermion mixing and fermion mass hierarchy, giving results in good agreement with experiment.
description: 14 pages
On the superstrings-induced four-dimensional gravity, and its applications to cosmology
Creators: name: Iihoshi, Masao
name: Ketov, Sergei V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We review the status of the fourth-order (quartic in the spacetime curvature) terms induced by superstrings/M-theory (compactified on a warped torus) in the leading order with respect to the Regge slope parameter, and study their (non-perturbative) impact on the evolution of the Hubble scale in the context of the four-dimensional FRW cosmology. After taking into account the quantum ambiguities in the definition of the off-shell superstring effective action, we propose the generalized Friedmann equations, find the existence of their (de Sitter) exact inflationary solutions without a spacetime singularity, and constrain the ambiguities by demanding stability and the scale factor duality invariance of our solutions. The most naive (Bel-Robinson tensor squared) quartic terms are ruled out, thus giving the evidence for the necessity of extra quartic (Ricci tensor-dependent) terms in the off-shell gravitational effective action for superstrings. Our methods are generalizable to the higher orders in the spacetime curvature.
description: 33 pages, LaTeX, no figures; extensive revision, Sec.6 and references added, stability analysis included
Dynamic analysis of influential stocks based on conserved networks
Creators: name: Xu, Xin-Jian
name: Min, Qin
name: Song, Xiao-Ying
name: Zhang, Li-Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Characterizing temporal evolution of stock markets is a fundamental and challenging problem. The literature on analyzing the dynamics of the markets has focused so far on macro measures with less predictive power. This paper addresses this issue from a micro point of view. Given an investigating period, a series of stock networks are constructed first by the moving-window method and the significance test of stock correlations. Then, several conserved networks are generated to extract different backbones of the market under different states. Finally, influential stocks and corresponding sectors are identified from each conserved network, based on which the longitudinal analysis is performed to describe the evolution of the market. The application of the above procedure to stocks belonging to Standard \& Pool's 500 Index from January 2006 to April 2010 recovers the 2008 financial crisis from the evolutionary perspective.
description: latex, 16 pages, 1 figure, 14 tables
Line Emission in the Brightest Cluster Galaxies of the NOAO Fundamental Plane and Sloan Digital Sky Surveys
Creators: name: Edwards, L. O. V.
name: Hudson, Michael J.
name: Balogh, Michael L.
name: Smith, Russell J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the optical emission line properties of Brightest Cluster Galaxies (BCGs) selected from two large, homogeneous datasets. The first is the X-ray selected National Optical Astronomy Observatory Fundamental Plane Survey (NFPS), and the second is the C4 catalogue of optically selected clusters built from the Sloan Digital Sky Survey Data Release ~3 (SDSS DR3). Our goal is to better understand the optical line emission in BCGs with respect to properties of the galaxy and the host cluster. Throughout the analysis we compare the line emission of the BCGs to that of a control sample made of the other bright galaxies near the cluster centre. Overall, both the NFPS and SDSS show a modest fraction of BCGs with emission lines (~15%). No trend in the fraction of emitting BCGs as a function of galaxy mass or cluster velocity dispersion is found. However we find that, for those BCGs found in cooling flow clusters, 71^{+9}_{-14}% have optical emission. Furthermore, if we consider only BCGs within 50kpc of the X-ray centre of a cooling flow cluster, the emission-line fraction rises further to 100^{+0}_{-15}%. Excluding the cooling flow clusters, only ~10% of BCGs are line emitting, comparable to the control sample of galaxies. We show that the physical origin of the emission line activity varies: in some cases it has LINER-like line ratios, whereas in others it is a composite of star-formation and LINER-like activity. We conclude that the presence of emission lines in BCGs is directly related to the cooling of X-ray gas at the cluster centre.
description: Accepted for publication in MNRAS. 13 pages mn2e style with 7 figures and 2 tables
Some constructions of almost para-hyperhermitian structures on manifolds and tangent bundles
Creators: name: Ianus, Stere
name: Vilcu, Gabriel Eduard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C15

description: In this paper we give some examples of almost para-hyperhermitian structures on the tangent bundle of an almost product manifold, on the product manifold $M\times\mathbb{R}$, where $M$ is a manifold endowed with a mixed 3-structure and on the circle bundle over a manifold with a mixed 3-structure.
description: 10 pages; This paper has been presented in the "4th German-Romanian Seminar on Geometry" Dortmund, Germany, 15-18 July 2007
title: Transition in post-USSR Europe: The Human Factor in Political Identity Formation
Creators: name: Grišinas, Arvydas
Publisher: name: University of Kent
Year: 2015

description: This interdisciplinary dissertation seeks a more holistic and broader understanding of political identity formation processes in post-USSR Eastern Europe. It seeks to develop a theoretical approach for assessing the non-rationalistic factors, which influence domestic and foreign policy, political attitudes and identities in the region – including associative symbolism, human experience, political images and historical narratives. The research is based on the main case of Lithuania, which is analysed in the first three chapters of the dissertation from three perspectives: the historical/political, the intellectual/narrative and the experiential/symbolic. Along the way, a theory is being inductively elaborated, offering new insights into the process of Lithuanian political identity formation. In the next two chapters, other cases are also explored in order to examine the theory’s applicability and broaden its spectrum of inquiry. These include Russia, Poland, Estonia and the ongoing conflict in Ukraine. Qualitative methods are used in this dissertation, including textual and visual analysis (of primary and secondary literary sources, photographs, film, etc.), unstructured interviews, historical analysis, as well as political, philosophical and anthropological theoretical approaches by Roland Barthes, Raoul Girardet, Alasdair MacIntyre, Charles Taylor, Victor Turner, Arpad Szakolczai, and others. The dissertation seeks to improve our understanding of political identity formation, periods of political transition and the importance of human experience to politics. It also aims at developing a theory capable of accounting for the often unrecognised factors of historical narrative, political symbolism and emotional associative charge. As a result it makes a contribution towards a better understanding of post-USSR Eastern European politics and thus to more effective policy towards the region, which is gaining increasing importance in global political arena.
Bismuth-doped g-C3N4/ZIF-8 heterojunction photocatalysts with enhanced photocatalytic performance under visible light illumination
Creators: name: Yang, Qian
name: Lin, Wensong
name: Duan, Zhichang
name: Xu, Sen
name: Chen, Junnan
name: Mai, Xin
Publisher: name: Taylor & Francis
Year: 2021
Subjects: Biochemistry
Space Science
Medicine
Biotechnology
Chemical Sciences not elsewhere classified

description: In this work, g-C3N4/ZIF-8 heterojunction photocatalysts were synthesised by the process by which the metal-organic framework ZIF-8 nanoparticles were grown onto the g-C3N4 layer in situ. Bismuth element was doped into the as-prepared g-C3N4/ZIF-8 material and a new type of Bi@g-C3N4/ZIF-8 composite photocatalysts was manufactured, in which the doping element acts in adjusting the bandgap in the photocatalysts. The prepared photocatalysts were characterised by XRD, FESEM, TEM, FTIR, XPS, UV–VIS DRS, photoluminescence and photo-electrochemical experiments. The results show that the ZIF-8 nanoparticles grown in situ were well-formed onto the g-C3N4 layer, and bismuth was evenly doped into the gaps of the g-C3N4/ZIF-8 framework. The degradation rate of methylene blue by CNZ-1.5(Bi)-12, which was a photocatalyst composed of 12% Bi-doped with g-C3N4/ZIF-8 material (the mass ratio of g-C3N4: ZIF-8 = 1:1.5), reached 86.6% under visible light irradiation within 60 min. The free radical scavenging experiment and electron spin resonance spectroscopy showed that ∙OH was the main active substance. Bismuth doping into the photocatalytic system promotes the excitation of electrons from the valence band to the conduction band and provides a good channel for the transmission of photogenerated carriers as well. It is achieved that intensive visible light absorption, the enhanced separation efficiency of photogenerated carriers, and excellent thermal stability and high recyclability in the novel composite photocatalyst, owing to the synergistic effect of the introduced bismuth with the heterostructure of g-C3N4/ZIF-8. Therefore, the synthesised Bi@g-C3N4/ZIF-8 heterojunction photocatalysts may be used as a good photocatalyst for purifying and degrading organic matter in sewage.
Harmonious perfection : the development of English studies in nineteenth-century Anglo-Canadian colleges
Creators: name: Hubert, Henry A.
Publisher: name: University of British Columbia
Year: 2010

description: In the last three decades, English studies in Anglophone colleges and universities in Canada have seen a marked diversification, including a return toward an historically normative program featuring both poetics and rhetoric. Such a balanced program, present at colleges like Dalhousie and McGill at the time of Canadian Confederation, developed from the earlier classical program of studies that itself included both poetics and rhetoric in Latin and Greek in each college's Classics offerings. The earliest Anglo-Canadian colleges, opened in the first half of the nineteenth century, were products of the religious interests of separate social groups each rooted in particular traditions. Anglican colleges stressed a curriculum modeled on Oxford and Cambridge, who featured liberal studies emphasizing classical learning in both content and language. Presbyterian colleges, modeled on Scottish universities, included classical studies but included a practical emphasis on rhetorical study in the vernacular. Methodist education, influenced by both English and American ties, was the most practical, with a strong rhetorical emphasis in the vernacular. Shortly after mid-century, English literature began to gain a place in non-Anglican colleges, and the rhetoric and poetics focus of Classical studies gradually moved to English. In the 1880s, however, the development of English studies was suddenly diverted from an expansion of rhetoric and poetics together to a strong literary focus. Instruction in oral rhetoric virtually died, and the teaching of written rhetoric was subsumed into a focus on expository writing as a means of examining literary criticism. The new curriculum, following Matthew Arnold's emphasis on "the best that has been known and thought," featured historical masterpieces in British literature. The focus of this curriculum was supported by a philosophical idealism that combined historic Christian thought with neo-Hegelianism in liberal Protestant institutions throughout the nation at the century's end. The narrowing of the curriculum was further fostered by academic specialization that swept Anglo-Canadian colleges just as idealism took a strong hold on liberal academic thought. This late nineteenth-century idealistic curriculum controlled Anglo-Canadian English studies until the late 1960s.
Thysanozoon Grube 1840
Creators: name: Khalili, Zahra
name: Rahimian, Hassan
name: Pazooki, Jamile
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Rhabditophora
Polycladida
Pseudoceritidae
Thysanozoon

description: Thysanozoon sp. Specimens examined: ZUTC Platy 1003, 1004, 1005, 1006, 1007. Specimens were found individually, under rubble and rocks, in intertidal pools (Fig. 8). Twenty-four specimens were collected from Stations No.1, 2 and 5 (Fig. 1, Table 1). Description. Body sizes range from 8 × 12 to 22 × 30 mm; body translucent, red-white mottled with white spot and dots (Figs 8, 9); dorsal papillae red (Figs. 10, 11); pseudotentacles ear-like and small; cerebral eyes form a horseshoe-shaped cluster; dorsal and ventral pseudotentacular eyes present in clusters; pharynx elongated about 1/5 body length (3.86 mm) with 6 pharyngeal folds; two male gonopores and a single female gonopore are present; sucker posterior to the female gonopore, placed about mid-body (Fig. 12). Anatomy of Reproductive System (Figs 13, 14). Testes and ovaries scattered throughout the body, doubled male copulatory apparatus posterior to the male gonopores; male gonopores situated directly after pharyngeal folds; male antrum short and wide (477 × 378 µm), with pointed stylet (387 × 108 µm); seminal vesicle oblong and muscular (387 × 153 µm); prostate oval (180 × 90 µm) with a thin wall; large female gonopore posterior to male gonopores, female antrum short and wide (288 × 180 µm) with cement glands.
description: Published as part of Khalili, Zahra, Rahimian, Hassan & Pazooki, Jamile, 2009, First record of the family Pseudocerotidae (Platyhelminthes, Polycladida, Cotylea) from the Persian Gulf, Iran, pp. 39-51 in ZooKeys 31 (3) on page 43, DOI: 10.3897/zookeys.31.136, http://zenodo.org/record/576580
Electrically charged pulsars
Creators: name: Alloy, M. D.
name: Menezes, D. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: n the present work we investigate one possible variation on the usual electrically neutral pulsars: the inclusion of electric charge. We study the effect of electric charge in pulsars assuming that the charge distribution is proportional to the energy density. All calculations were performed for zero temperature and fixed entropy equations of state.
Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
Creators: name: Rea, N.
name: Nichelli, E.
name: Israel, G. L.
name: Perna, R.
name: Oosterbroek, T.
name: Parmar, A. N.
name: Turolla, R.
name: Campana, S.
name: Stella, L.
name: Zane, S.
name: Angelini, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on two new XMM-Newton observations of the Anomalous X-ray Pulsar (AXP) 4U 0142+614 performed in March and July 2004, collecting the most accurate spectrum for this source to date. Furthermore, we analyse two short archival observations performed in February 2002 and January 2003 (the latter already reported by Gohler et al. 2005) in order to study the long term behaviour of this AXP. 4U 0142+614 appears to be relatively steady in flux between 2002 and 2004, and the phase-averaged spectrum does not show any significant variability between the four epochs. We derive the deepest upper limits to date on the presence of lines in the 4U 0142+614 spectrum as a function of energy: equivalent width in the 1-3 keV energy range < 4 eV and < 8 eV for narrow and broad lines, respectively. A remarkable energy dependence in both the pulse profile and the pulsed fraction is detected, and consequently pulse-phase spectroscopy shows spectral variability as a function of phase. By making use of XMM-Newton and INTEGRAL data, we successfully model the 1-250 keV spectrum of 4U 0142+614 with three models presented in Rea et al. (2007a), namely the canonical absorbed blackbody plus two power-laws, a resonant cyclotron scattering model plus one power-law and two log-parabolic functions.
description: 9 pages, 5 figures; accepted for publication on MNRAS (typos corrected and few references added)
Dinâmica multitemporal da cobertura vegetal da Sub-Bacia Hidrográfica do Riacho São José, Caxias (Maranhão)
Creators: name: Alessandra de Abreu Andrade
name: and others
Publisher: name: Zenodo
Year: 2023

description: R E S U M OAs bacias hidrográficas são unidades físicos-naturais essenciais para a sociedade, considerada objeto de pesquisa nos estudos geográficos por serem um geossistema completo. O artigo teve por objetivo analisar a dinâmica multitemporal da cobertura vegetal da Sub-Bacia Hidrográfica do Riacho São José (BHRSJ) no município de Caxias – MA, através do índice do NDVI, com recorte temporal para os anos de 1991, 2001, 2011 e 2021. Como metodologia partiu-se do levantamento da literatura sobre a temática e geoprocessamento em ambiente SIG a partir do uso de imagens de satélites do Landsat 5 e Sentinel 2, ambos no período de estiagem para a região (julho a dezembro) e trabalho de campo. A dinâmica multitemporal revelou que de 1991 a 2021, houve um crescente processo de supressão e degradação da cobertura vegetal no baixo curso da bacia, em virtude do crescimento urbano da cidade de Caxias. A falta de planejamento prévio provocou a ocupação irregular em áreas de preservação permanente dos cursos dos rios, o que ocasionou inúmeros problemas socioambientais, como acúmulo de lixo, despejo de esgotos sem tratamento, desmatamento, erosão das margens pela ausência da mata ciliar, agricultura entre outros. A aplicação do NVDI é uma importante ferramenta de análise ambiental, sobretudo para o monitoramento da cobertura vegetal, onde o resultado da leitura dos pixels de -1 a 1 possibilita aferir quanto ao maior indício de presença de solos descobertos, área urbana e rochas e maior indício de presença de vegetação.Palavras-Chaves: Análise Ambiental, SIG, NDVI, Bacia Hidrográfica.
Nonlinear stage of the Benjamin-Feir instability: Three-dimensional coherent structures and rogue waves
Creators: name: Ruban, V. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: A specific, genuinely three-dimensional mechanism of rogue wave formation, in a late stage of the modulational instability of a perturbed Stokes deep-water wave, is recognized through numerical experiments. The simulations are based on fully nonlinear equations describing weakly three-dimensional potential flows of an ideal fluid with a free surface in terms of conformal variables. Spontaneous formation of zigzag patterns for wave amplitude is observed in a nonlinear stage of the instability. If initial wave steepness is sufficiently high ($ka>0.06$), these coherent structures produce rogue waves. The most tall waves appear in ``turns'' of the zigzags. For $ka<0.06$, the structures decay typically without formation of steep waves.
description: 11 pages, 7 figures, submitted to PRL
Additional file 6 of The linkage of NF-κB signaling pathway-associated long non-coding RNAs with tumor microenvironment and prognosis in cervical cancer
Creators: name: Feng, Xue
name: Shan, Ru
name: Hu, Xiaomeng
Publisher: name: figshare
Year: 2023
Subjects: subject: Immunology
subject: FOS: Clinical medicine

description: Additional file 6: Figure S5.
Azimuth Reference - Human PBMC
Creators: name: Satija Lab
Publisher: name: Zenodo
Year: 2021
Subjects: Azimuth Seurat single-cell

description: Here we provide the reference data files used to run the Azimuth Human PBMC reference web application. For a full description of the reference data structure, please see the wiki at https://github.com/satijalab/azimuth/wiki/Azimuth-Reference-Format.
Sarcocystis
Creators: name: Fayer, Ronald
Publisher: name: American Association of Bovine Practitioners  Proceedings of the Annual Conference
Year: 1981

description: In the past ten years over 400 research papers have been written on the subject of Sarcocystis. Most papers have described either the life cycles and routes of transmission from one host animal to another, the clinical signs of disease, or methods of diagnosis. With such information now available practitioners and clinicians have been able to diagnose outbreaks in dairy and beef cattle that heretofore would have been misdiagnosed or would remain undiagnosed. Furthermore, they can explain to the producer how to prevent subsequent losses.
description: American Association of Bovine Practitioners Proceedings of the Annual Conference, 1981
W. R. MacKay House
Creators: name: Unknown
Publisher: name: Unknown
Year: 0
Subjects: Photographs
Photos
Historic buildings
East Hampton
Structures
Dwellings

description: This image show the front of the W. R. Mackay House. This image is courtesy of Elizabeth Kelly and this reproduction was collected sometime from 1970 to 1982 as part of the East Hampton’s Heritage Photo Collection.
description: Images within East Hampton Heritage Photo Collection seem to have been taken or collected in relation to the East Hampton Heritage project, but not all of them were included in the final publication. Several photographer are included in this collection.
The Growth of Black Holes and Their Host Spheroids in (Sub)mm-loud QSOs at High Redshift
Creators: name: Hao, C. N.
name: Xia, X. Y.
name: Mao, S.
name: Deng, Z. G.
name: Wu, Hong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the growth of black holes and stellar population in spheroids at high redshift using several (sub)mm-loud QSO samples. Applying the same criteria established in an earlier work, we find that, similar to IR QSOs at low redshift, the far-infrared emission of these (sub)mm-loud QSOs mainly originates from dust heated by starbursts. By combining low-z IR QSOs and high-z (sub)mm-loud QSOs, we find a trend that the star formation rate ($\Mstardot$) increases with the accretion rate ($\Mdot$). We compare the values of $\Mstardot/\Mdot$ for submm emitting galaxies (SMGs), far-infrared ultraluminous/hyperluminous QSOs and typical QSOs, and construct a likely evolution scenario for these objects. The (sub)mm-loud QSO transition phase has both high $\Mdot$ and $\Mstardot$ and hence is important for establishing the correlation between the masses of black holes and spheroids.
description: 19 pages,3 figures,submitted to Chin. J. Astron. Astrophys. This paper was first prepared for publication on August 10th, 2005
Bismuth-doped g-C3N4/ZIF-8 heterojunction photocatalysts with enhanced photocatalytic performance under visible light illumination
Creators: name: Yang, Qian
name: Lin, Wensong
name: Duan, Zhichang
name: Xu, Sen
name: Chen, Junnan
name: Mai, Xin
Publisher: name: Taylor & Francis
Year: 2021
Subjects: Biochemistry
Space Science
Medicine
Biotechnology
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified

description: In this work, g-C3N4/ZIF-8 heterojunction photocatalysts were synthesized by the process which the metal organic framework ZIF-8 nanoparticles were grown onto the g-C3N4 layer in situ. Bismuth element was doped into the as-prepared g-C3N4/ZIF-8 material and new type of Bi@g-C3N4/ZIF-8 composite photocatalysts were manufactured, in which the doping element acts in adjusting the band gap in the photocatalysts. The prepared photocatalysts were characterized by XRD, FESEM, TEM, FTIR, XPS, UV-Vis DRS, photoluminescence and photo-electrochemical experiments. The results show that the ZIF-8 nanoparticles grown in situ were well formed onto the g-C3N4 layer, and bismuth was evenly doped into the gaps of the g-C3N4/ZIF-8 framework. The degradation rate of methylene blue by CNZ-1.5(Bi)-12, which was a photocatalyst composed of 12% Bi doped with g-C3N4/ZIF-8 material (the mass ratio of g-C3N4: ZIF-8 = 1:1.5), reached 86.6% under visible light irradiation within 60 minutes. The free radical scavenging experiment and electron spin resonance spectroscopy showed that •OH was the main active substance. Bismuth doping into the photocatalytic system promotes the excitation of electrons from the valence band to the conduction band, and provides a good channel for the transmission of photogenerated carriers as well. It is achieved that intensive visible-light absorption, enhanced separation efficiency of photogenerated carriers, and excellent thermal stability and high recyclability in the novel composite photocatalyst, owing to the synergistic effect of the introduced bismuth with the heterostructure of g-C3N4/ZIF-8. Therefore, the synthesized Bi@g-C3N4/ZIF-8 heterojunction photocatalysts may be used as a good photocatalyst for purifying and degrading organic matter in sewage.
Mathematical reformulation of the Kolmogorov-Richardson energy cascade in terms of vortex stretching
Creators: name: Yoneda, Tsuyoshi
name: Goto, Susumu
name: Tsuruhashi, Tomonori
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: Primary 76F02, Secondary 76F65, Tertiary 35Q30, Quaternary 76D03

description: In this paper, with the aid of direct numerical simulations (DNS) of forced turbulence in a periodic domain, we mathematically reformulate the Kolmogorov-Richardson energy cascade in terms of vortex stretching. By using the description, we prove that if the Navier-Stokes flow satisfies a new regularity criterion in terms of the enstrophy production rate, then the flow does not blow up. Our DNS results seem to support this regularity criterion. Next, we mathematically construct the hierarchy of tubular vortices, which is statistically self-similar in the inertial range. Under the assumptions of the scale-locally of the vortex stretching/compressing (i.e. energy cascade) process and the statistical independence between vortices that are not directly stretched or compressed, we can derive the $-5/3$ power law of the energy spectrum of statistically stationary turbulence without directly using the Kolmogorov hypotheses.
Generalized Wick's theorem for multiquasiparticle overlaps as a limit of Gaudin's theorem
Creators: name: Perez-Martin, S.
name: Robledo, L. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We are able to rederive in a very simple way the standard generalized Wick's theorem for overlaps of mean field wave functions by using the extension of the statistical Wick's theorem (Gaudin's theorem) in the appropriate limits.
description: 28 pages
Primordial black holes and secondary gravitational waves from string inspired general no-scale supergravity
Creators: name: Wu, Lina
name: Gong, Yungui
name: Li, Tianjun
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The formation of primordial black hole (PBH) dark matter and the generation of scalar induced secondary gravitational waves (SIGWs) have been studied in the generic no-scale supergravity inflationary models. By adding an exponential term to the Kähler potential, the inflaton experiences a period of ultraslow-roll and the amplitude of primordial power spectrum at small scales is enhanced to $\mathcal{O}(10^{-2})$. The enhanced power spectra of primordial curvature perturbations can have both sharp and broad peaks. A wide mass range of PBHs can be produced in our model, and the frequencies of the accompanied SIGWs are ranged form nanohertz to kilohertz. We show four benchmark points where the generated PBH masses are around $\mathcal{O}(10^{-16}M_{\odot})$, $\mathcal{O}(10^{-12}M_{\odot})$, $\mathcal{O}(10^{-2}M_{\odot})$ and $\mathcal{O}(10^{2}M_{\odot})$. The PBHs with masses around $\mathcal{O}(10^{-16}M_{\odot})$ and $ \mathcal{O}(10^{-12}M_{\odot})$ can make up almost all the dark matter, and the accompanied SIGWs can be probed by the upcoming space-based gravitational wave observatory. Also, the SIGWs accompanied with the formation of stellar mass PBHs can be used to interpret the stochastic GW background in the nanohertz band, detected by the North American Nanohertz Observatory for gravitational waves, and can be tested by future interferometric gravitational wave observatory.
description: 28 pages, 5 figures, references added, typos corrected, published version
On C$^2$-smooth Surfaces of Constant Width
Creators: name: Guilfoyle, Brendan
name: Klingenberg, Wilhelm
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: A number of results for C$^2$-smooth surfaces of constant width in Euclidean 3-space ${\mathbb{E}}^3$ are obtained. In particular, an integral inequality for constant width surfaces is established. This is used to prove that the ratio of volume to cubed width of a constant width surface is reduced by shrinking it along its normal lines. We also give a characterization of surfaces of constant width that have rational support function. Our techniques, which are complex differential geometric in nature, allow us to construct explicit smooth surfaces of constant width in ${\mathbb{E}}^3$, and their focal sets. They also allow for easy construction of tetrahedrally symmetric surfaces of constant width.
description: 14 pages AMS-LATEX, 5 figures
title:  La communauté archéologique francophone à l’épreuve de la globalisation : échanges et publications scientifiques
Creators: name: Vassal  ,  Véronique
Publisher: name: Roma TrE-Press
Year: 2021

description: Le savoir est en constante évolution, la communication scientifique joue un rôle fondamental dans la diffusion des idées. Après de nombreuses années de magistère culturel, la place du français et de la francophonie régresse. Aujourd’hui, l’anglais s’est imposé comme langue de référence. Le domaine de l’archéologie francophone, qui avait longtemps résisté, semble à son tour touché par l’obligation de publier en langue anglaise. Face à ces mutations et à la multitude d’ouvrages et d’articles publiés dans le monde, de nouveaux modes d’édition numérique apparaissent, de nouveaux réseaux sociaux scientifiques favorisent les échanges, libérant ainsi les chercheurs de certaines contraintes, tout en leur imposant de nouveaux défis.
description: Interculture : contributions, réseaux, spécificités des contextes francophones
Imaging charge-migration in chiral molecules using time-resolved x-ray diffraction
Creators: name: Giri, Sucharita
name: Tremblay, Jean Christophe
name: Dixit, Gopal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Four-dimensional imaging of charge migration is crucial to the understanding of several ubiquitous processes in nature. The present work focuses on imaging of charge migration in an oriented epoxypropane: a chiral molecule. A linearly polarized pulse is used to induce the charge migration, which is imaged by time-resolved x-ray diffraction. It is found that the total time-resolved diffraction signals are significantly different for both enantiomers. Furthermore, a connection between time-resolved x-ray diffraction and the electronic continuity equation is discussed by analyzing the time-dependent diffraction signal and the time derivative of the total electron density in the momentum space.
description: 9 Pages, 5 figures
Benchmarking Structured Policies and Policy Optimization for Real-World Dexterous Object Manipulation
Creators: name: Funk, Niklas
name: Schaff, Charles
name: Madan, Rishabh
name: Yoneda, Takuma
name: De Jesus, Julen Urain
name: Watson, Joe
name: Gordon, Ethan K.
name: Widmaier, Felix
name: Bauer, Stefan
name: Srinivasa, Siddhartha S.
name: Bhattacharjee, Tapomayukh
name: Walter, Matthew R.
name: Peters, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Dexterous manipulation is a challenging and important problem in robotics. While data-driven methods are a promising approach, current benchmarks require simulation or extensive engineering support due to the sample inefficiency of popular methods. We present benchmarks for the TriFinger system, an open-source robotic platform for dexterous manipulation and the focus of the 2020 Real Robot Challenge. The benchmarked methods, which were successful in the challenge, can be generally described as structured policies, as they combine elements of classical robotics and modern policy optimization. This inclusion of inductive biases facilitates sample efficiency, interpretability, reliability and high performance. The key aspects of this benchmarking is validation of the baselines across both simulation and the real system, thorough ablation study over the core features of each solution, and a retrospective analysis of the challenge as a manipulation benchmark. The code and demo videos for this work can be found on our website (https://sites.google.com/view/benchmark-rrc).
Resource-aware Time Series Imaging Classification for Wireless Link Layer Anomalies
Creators: name: Bertalanič, Blaž
name: Meža, Marko
name: Fortuna, Carolina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The number of end devices that use the last mile wireless connectivity is dramatically increasing with the rise of smart infrastructures and require reliable functioning to support smooth and efficient business processes. To efficiently manage such massive wireless networks, more advanced and accurate network monitoring and malfunction detection solutions are required. In this paper, we perform a first time analysis of image-based representation techniques for wireless anomaly detection using recurrence plots and Gramian angular fields and propose a new deep learning architecture enabling accurate anomaly detection. We elaborate on the design considerations for developing a resource aware architecture and propose a new model using time-series to image transformation using recurrence plots. We show that the proposed model a) outperforms the one based on Grammian angular fields by up to 14 percentage points, b) outperforms classical ML models using dynamic time warping by up to 24 percentage points, c) outperforms or performs on par with mainstream architectures such as AlexNet and VGG11 while having <10 times their weights and up to $\approx$8\% of their computational complexity and d) outperforms the state of the art in the respective application area by up to 55 percentage points. Finally, we also explain on randomly chosen examples how the classifier takes decisions.
description: 13 pages, 4 figures, 18 subfigures
Measuring Time-Dependent Induced Quantum Coherences via Two-Dimensional Coherence Spectroscopy
Creators: name: Barford, William
name: Arber, Allison Nicole
name: McLennan, Fynn
name: Marcus, Max
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a two-dimensional spectroscopic protocol for measuring the time-dependent coherences between the stationary states of a system induced by a time-dependent system-bath interaction. We also investigate the role of temporally-correlated noise on coherence dephasing. This protocol enables dynamical information about the system and its coupling to the environment to be determined. Our results are based on the quantum-trajectory method, and are obtained from both approximate, analytical and exact, numerical solutions of the time-dependent Schroedinger equation. As an example, we show how this protocol can be used to investigate exciton dynameds in conjugated polymers induced by the coupling of their torsional modes with the environment.
Towards mental time travel: a hierarchical memory for reinforcement learning agents
Creators: name: Lampinen, Andrew Kyle
name: Chan, Stephanie C. Y.
name: Banino, Andrea
name: Hill, Felix
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences
subject: I.2.6

description: Reinforcement learning agents often forget details of the past, especially after delays or distractor tasks. Agents with common memory architectures struggle to recall and integrate across multiple timesteps of a past event, or even to recall the details of a single timestep that is followed by distractor tasks. To address these limitations, we propose a Hierarchical Chunk Attention Memory (HCAM), which helps agents to remember the past in detail. HCAM stores memories by dividing the past into chunks, and recalls by first performing high-level attention over coarse summaries of the chunks, and then performing detailed attention within only the most relevant chunks. An agent with HCAM can therefore "mentally time-travel" -- remember past events in detail without attending to all intervening events. We show that agents with HCAM substantially outperform agents with other memory architectures at tasks requiring long-term recall, retention, or reasoning over memory. These include recalling where an object is hidden in a 3D environment, rapidly learning to navigate efficiently in a new neighborhood, and rapidly learning and retaining new object names. Agents with HCAM can extrapolate to task sequences much longer than they were trained on, and can even generalize zero-shot from a meta-learning setting to maintaining knowledge across episodes. HCAM improves agent sample efficiency, generalization, and generality (by solving tasks that previously required specialized architectures). Our work is a step towards agents that can learn, interact, and adapt in complex and temporally-extended environments.
description: NeurIPS 2021; 10 pages main text; 29 pages total