cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The static force in background perturbation theory
Creators: name: Badalian, A. M.
name: Veselov, A. I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The static force $F_B(r)$ and the strong coupling $α_F(r)$, which defines the gluon-exchange part of $F_B(r)$, are studied in QCD background perturbation theory (BPT). In the region $r\la 0.6 $ fm $α_F(r)$ turns out to be essentially smaller than the coupling $α_B(r)$ in the static potential. For the dimensionless function $Φ_B(r) = r^2 F_B(r)$ the characteristic values $Φ_B(r_1) =1.0$ and $Φ_B(r_0)=1.65$ are shown to be reached at the following $Q\bar Q$ separations: $r_1\sqrtσ =0.77, r_0\sqrtσ =1.09$ in quenched approximation and $r_1\sqrtσ=0.72, r_0\sqrtσ=1.04$ for $n_f =3$. The numbers obtained appear to be by only 8% smaller than those calculated in lattice QCD while the values of the couplings $α_F(r_1)$ and $α_F(r_0)$ in BPT are by $\sim 30% (n_f =3)$ and $50% (n_f=0)$ larger than corresponding lattice couplings. With the use of the BPT potential good description of the bottomonium spectrum is obtained.
description: 21 pages, 1 figure. To be publised in Phys. Atom. Nucl. dedicated to the 70-th birthday of Yu.A. Simonov
MUNDOS DA PRODUÇÃO DE ALIMENTO: A COMPETIÇÃO NO SISTEMA AGROALIMENTAR PELA LENTE DA ECONOMIA DAS CONVENÇÕES
Creators: name: Souza, Marco Antonio Ferreira De
name: Wilkinson, John
name: Souza, Marco Antonio Ferreira De
name: Wilkinson, John
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Sistema Agroalimentar
subject: estratégia
subject: mundos da produção
subject: agrofood system
subject: strategy
subject: worlds of production

description: A competição no sistema agroalimentar revela, atualmente, características semelhantes à de outros sistema produtivos, onde predominam os esforços para diferenciação na oferta de produtos. Atender às exigências da demanda tornou-se uma regra básica para a sobrevivência dos negócios, fazendo com que benefícios como praticidade, variedade, conveniência e qualidade ganhem crescente evidência. Contudo, ao contrário dos outros tipos de bens, qualidade nos alimentos é uma categoria analítica sujeita a distintas interpretações. Os problemas de contaminação e pobreza nutricional nos alimentos geram oportunidades para uma profunda reflexão sobre o sistema de oferta de alimentos e para as ações dos atores econômicos que procuram apresentar projetos de produtos cada vez mais diferenciados. Este trabalho apresenta uma leitura do panorama competitivo na oferta de alimento tendo como base o foco na qualidade. Por meio da Economia das Convenções analisa-se distintos mundos da produção de alimentos e como estes se organizam. A partir da contribuição de Michel Storper, procura-se demonstrar quais são os mundos da produção de alimentos.--------------------------------------------Competition on the agrofood has increasingly resembling that of others productive systems, where product diferentiation became a commom place. In order to survive businesses should satisfy demand requirements giving more attention to benefits like practicity, variety and convenience. Nevertheless, on the contrary of other kind of products quality in food is an analytical category subject to different interpretations. Food scares and poor nutritional levels are issues that raise opportunities for reflexion about food provision as well as for economic agents actions that search to provide projects of products increasingly differentiated. In this sense, this work present an interpretation of the food provision competitive landscape focusing on the prevailing quality claims. By applying conventions economy concepts worlds of food production are analysed and have its economical activities uncovered. From the contributions of Michael Storper the worlds of food production are demonstrated.
Combined effects of elevated [CO2] and increased temperatures on cacao reproductive development
Creators: name: Mateus-Rodriguez, J.F.
name: Daymond, A.J.
name: Lahive, F.
name: Hadley, P.
Publisher: name: Zenodo
Year: 2023

description: Climate change is leading to increased temperature worldwide, however the impact of this on crops needs to be considered in conjunction with accompanied increases in CO2 concentration ([CO2]). This study examined the combined effects of elevated [CO2] and increased temperature on pollen viability, pod set, pod growth and bean yield in cacao. All pods were established by hand pollination. Mature cacao trees of three genotypes (CCN 51, SCA 6, and T 85/799) were grown in a six compartment, controlled environment glasshouse adapted for cacao studies under non-limiting water and nutrient supply. Trees were exposed to three day/night temperatures; 31/22°C (Tc), 33.5/24.5°C (Tc+2.5°C) and 36/27°C (Tc+5.0°C) combined with two [CO2] treatments; ambient (ca. 437 ppm) and elevated (ca. 693 ppm) in a factorial design for 553 days. The control temperature regime (Tc) was based on temperatures that are common for West African cacao regions. 
Pollen germination and pollen tube length were negatively affected by a 5°C increase in temperature; this was particularly evident for SCA 6 and T 85/799. However, elevated [CO2] largely compensated the negative effect of high temperature in all three genotypes. The percentage of pods set decreased with an increase in temperature, and the highest percentage of wilted pods was observed at 33.5/24.5°C. However, elevated [CO2] enhanced pollination success and pod set, and reduced the percentage of pods wilted across all temperatures. At ambient [CO2], pod size declined with increases in temperatures, whereas at elevated [CO2] an increase in temperature resulted in larger pods in CCN 51 and little change for SCA 6. A similar trend was observed for pod dry weight. A positive effect of elevated [CO2] on individual bean dry weight was observed at the higher temperatures for CCN 51, whereas little effect was seen in SCA 6. 
For most of the reproductive components studied here, it can be concluded that elevated [CO2] mitigates to a greater or lesser extent the negative effect of elevated temperatures. Pod growth and bean yield were more responsive to elevated [CO2] under warm conditions in CCN 51 than SCA 6 suggesting there is some scope for selecting genotypes better suited to a changing climate.
Keywords: Climate change; Theobroma cacao L.; controlled environments; reproductive components; cacao pods.
Massive spinor fields in flat spacetimes with non-trivial topology
Creators: name: Ahmadi, N.
name: Nouri-Zonoz, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The vacuum expectation value of the stress-energy tensor is calculated for spin $1\over 2$ massive fields in several multiply connected flat spacetimes. We examine the physical effects of topology on manifolds such as $R^3 \times S^1$, $R^2\times T^2$, $R^1 \times T^3$, the Mobius strip and the Klein bottle. We find that the spinor vacuum stress tensor has the opposite sign to, and twice the magnitude of, the scalar tensor in orientable manifolds. Extending the above considerations to the case of Misner spacetime, we calculate the vacuum expectation value of spinor stress-energy tensor in this space and discuss its implications for the chronology protection conjecture.
description: 18 pages, Some of the equations in section VI as well as typographical errors corrected, 5 figures, Revtex4
Ferrocenyl induced one-pot synthesis of 3,3′-ferrocenylbiindoles
Creators: name: Ligang Yan
name: Limin Han
name: Ruijun Xie
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: When we used 2-ferrocenethynylaniline (1a) as reactant and NaAuCl4·2H2O (5%) as catalyst to prepare 2-ferrocenylindole (2a), we were surprised to find that 3,3′-ferrocenylbiindole (3a) was obtained simultaneously. 3a was characterized by elemental analysis, FT-IR, MS, NMR, and X-ray single crystal diffraction. The reactant substitution reaction, in-situ HNMR, XPS, EPR characterization, and calculations were carried out to interpret why 3a was obtained in one pot. The results showed that the hydroperoxyl radical played a key role in the reaction, which induced synthesis of 3a.
Improving the beam quality factor ($M^2$) by phase-only reshaping of structured light
Creators: name: Scholes, Stirling
name: Forbes, Andrew
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Laser brightness is crucial in many optical processes, and is optimised by high power, high beam quality (low $M^2$) beams. Here we show how to improve the laser beam quality factor (reducing the $M^2$) of arbitrary structured light fields in a lossless manner using continuous phase-only elements, thus allowing for the increase in brightness by a simple linear optical transformation. We demonstrate the principle with four high $M^2$ initial beams, converting each to a Gaussian ($M^2 \approx 1$) with a dramatic increase in brightness of $>10 \times$. This work puts a new perspective on the old debate of improving laser beam quality with binary diffractive optics, while providing a practical approach to enhancing laser brightness for arbitrary input beams.
Markovian feedback to control continuous variable entanglement
Creators: name: Mancini, Stefano
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a model to realize quantum feedback control of continuous variable entanglement. It consists of two interacting bosonic modes subject to amplitude damping and achieving entangled Gaussian steady state. The possibility to greatly improve the degree of entanglement by means of Markovian (direct) feedback is then shown.
description: 4 pages Revtex, new figures, added comments
Theory and Simulations of condensin mediated loop extrusion in DNA
Creators: name: Takaki, Ryota
name: Dey, Atreya
name: Shi, Guang
name: Thirumalai, Dave
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Genomics (q-bio.GN)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Condensation of hundreds of mega-base-pair-long human chromosomes in a small nuclear volume is a spectacular phenomenon. This process is driven by the formation of chromosome loops. ATP consuming motor, condensin, interacts with chromatin segments to actively extrude loops. Motivated by real-time imaging of loop extrusion (LE) and measurements using magnetic tweezer experiments, we created an analytically solvable model, predicting the LE velocity and step size distribution as a function of external load. The theory fits the experimental data quantitatively, and suggests that condensin must undergo a large conformational change, induced by ATP binding, bringing distant parts of the motor to proximity. Simulations using a simple model confirm that the motor transitions between an open to closed state in order to extrude loops by a scrunching mechanism, similar to that proposed in DNA bubble formation during bacterial transcription. Changes in the orientation of the motor domains are transmitted over $\sim$ 50 nm, connecting the motor head and the hinge, thus providing an allosteric basis for LE.
title: "Il giudizio di Salomone", De Ribera Jusepe detto Spagnoletto, inv. 033 (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Puddu, Pier Ludovico
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
Modelling windthrow risk in coastal variable retention using tree, neighbourhood, and stand attributes
Creators: name: Scott, Robyn Elizabeth
Publisher: name: University of British Columbia
Year: 2009

description: The adoption of the retention system in much of coastal British Columbia, Canada, has brought with it concern over the windfirmness of the retained trees. The present state of knowledge concerning windthrow risk factors is inadequate for the purposes of risk prediction in partial cuts and in structurally complex forests, such as those that exist in Clayoquot Sound. This study examined the relationship between the occurrence of windthrow after partial-cut harvesting and various stand, neighbourhood, and tree attributes. Measurements of 1215 trees were obtained from 234 sample plots in retention system cutblocks in Clayoquot Sound on the west coast of Vancouver Island, and of 1891 trees from 115 plots in the Silviculture Treatments for Ecosystem Management in the Sayward (STEMS) study site near Campbell River. At the Clayoquot site, 16.5% of trees were windthrown, while at the STEMS site, 5.3% of trees were windthrown. Logistic regression models were fit for both areas using tree, neighbourhood, and stand variables to predict the probability of individual trees being windthrown. The best-fit models for the Clayoquot and STEMS datasets correctly predicted windthrow status of 72% and 94% of the sampled trees, respectively. The proportion of damaged trees at the Clayoquot site increased with increasing tree height-diameter ratio, crown density (sparse, moderate, full), and an index of fetch distance equal to distance multiplied by removal level, and decreased with increasing percent live crown and post-harvest density. At the STEMS site, windthrow decreased with increasing tree diameter. It is recommended that forest managers plan to retain at least 20% of original stand density in areas where windthrow is a concern, and focus retention efforts on trees with low height-diameter ratios, sparse crowns, and high percent live crown.
EVOLUÇÃO DAS QUANTIDADES CONSUMIDAS DOS PRINCIPAIS HERBICIDAS PARA A CULTURA DA SOJA (GLYCINE MAX (L.) MERRILL) NOS ESTADOS DO MATO GROSSO, PARANÁ, RIO GRANDE DO SUL E BRASIL, NO PERÍODO 2000-2005.
Creators: name: Balcewicz, Luiz Carlos
name: Balcewicz, Luiz Carlos
Publisher: name: Unknown
Year: 2008
Subjects: subject: Crop Production/Industries
subject: herbicidas
subject: glifosato
subject: soja
subject: weedkiller
subject: gliphosate
subject: soy

description: O presente estudo detalha e evolução dos quinze principais ingredientes ativos de herbicidas para a soja comercializados nos três principais estados produtores dessa cultura (Mato Grosso, Paraná e Rio Grande do Sul) e no agregado Brasil com base em informações dos Relatórios de Consumo de Ingredientes Ativos de Agrotóxicos e Afins no Brasil, período 2000-2005, realizado pelo Instituto Brasileiro do Meio Ambiente – IBAMA, correlaciona seus dados, discute as possíveis causas e explicações dessas variações e infere sobre possíveis impactos sobre a biodiversidade. -----------------------------------------------The present study it on the basis of details and evolution of the fifteen main active ingredients of weedkiller for the soy commercialized in the three main producing states of this culture (Mato Grosso, Paraná and Rio Grande do Sul) and in the Brazil aggregate information of the Reports of Consumption of Active Ingredients of Agrotóxicos and Afins in Brazil, period 2000-2005, carried through for the Brazilian Institute of the Environment - IBAMA, correlates its data, argues the possible causes and explanations of these variations and infers on possible impacts on biodiversity.
Spectra of prompt electrons from decays of B+ and B0 mesons and ratio of inclusive semielectronic branching fractions
Creators: name: Okabe, T.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present spectra of prompt electrons from decays of neutral and charged B mesons. The results are based on 140 /fb of data collected by the Belle detector on the Upsilon(4S) resonance at the KEKB e+e- asymmetric collider. We tag Upsilon(4S) -> B \bar{B} events by reconstructing a B meson in one of several hadronic decay modes; the semileptonic decay of the other B meson is inferred from the presence of an identified electron. We obtain for charged and neutral B mesons the partial rates of semileptonic decay, to electrons with momentum greater than 0.6 GeV/c in the B rest frame, and their ratio b_+/b_0 = 1.08 +- 0.05 +- 0.02, where the first and second errors are statistical and systematic, respectively.
description: 16 pages, 2 figure files, submitted to Phys. Lett. B
Non-normality and non-monotonic dynamics in complex reaction networks
Creators: name: Nicolaou, Zachary G.
name: Nishikawa, Takashi
name: Nicholson, Schuyler B.
name: Green, Jason R.
name: Motter, Adilson E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Chemical Physics (physics.chem-ph)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Complex chemical reaction networks, which underlie many industrial and biological processes, often exhibit non-monotonic changes in chemical species concentrations, typically described using nonlinear models. Such non-monotonic dynamics are in principle possible even in linear models if the matrices defining the models are non-normal, as characterized by a necessarily non-orthogonal set of eigenvectors. However, the extent to which non-normality is responsible for non-monotonic behavior remains an open question. Here, using a master equation to model the reaction dynamics, we derive a general condition for observing non-monotonic dynamics of individual species, establishing that non-normality promotes non-monotonicity but is not a requirement for it. In contrast, we show that non-normality is a requirement for non-monotonic dynamics to be observed in the Rényi entropy. Using hydrogen combustion as an example application, we demonstrate that non-monotonic dynamics under experimental conditions are supported by a linear chain of connected components, in contrast with the dominance of a single giant component observed in typical random reaction networks. The exact linearity of the master equation enables development of rigorous theory and simulations for dynamical networks of unprecedented size (approaching $10^5$ dynamical variables, even for a network of only 20 reactions and involving less than 100 atoms). Our conclusions are expected to hold for other combustion processes, and the general theory we develop is applicable to all chemical reaction networks, including biological ones.
description: Software implementing our methods is available as a Github repository at https://github.com/znicolaou/ratematrix and an animated version of Fig. 1 is available at https://northwestern.box.com/s/otn3m2cov9gi3enht3r8jh5kjo9qnv6d
Satisfactory Survey Analysis in IPB Vocational School using Importance Performance Analysis (IPA)
Creators: name: Walidatush Sholihah
name: Novianty, Inna
Publisher: name: figshare
Year: 2020
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences

description: IPB Vocational School is an institution of education service providers thatprovide services to students as users. Service quality needs to be improved to satisfycustomers. One way to improve the service is to conduct a satisfaction survey. Studentsatisfaction survey in Diploma Program IPB conducted by Discipline and StudentCommission. This survey is conducted every year. The 2014 survey form consists of 18questions divided into two aspects. These aspects are academic (10 questions) andfacilities (8 questions). The research method are the implementation of the surveyactivity and the data processing of survey result using Importance PerformanceAnalysis (IPA). IPA assesses the various elements of the service pack and identifies therequired actions. With IPA, all questions are grouped into four quadrants. X axisexpresses the level of satisfaction and the axis Y states the level of importance. Thequestions that lie in quadrant 1 need to be a top priority for improvement because forstudents, the aspect is important but the quality of service is still low. The questions arethe 6th and 7th questions in the academic aspect. The question is about the lecture andlaboratory facilities. In terms of facilities, 7th and 8th questions about career andemployment guidance services as well as scholarship services. The survey form is filledby 180 respondents who are active students of IPB Diploma Program in 2014.
On Conjectures Concerning the Smallest Part and Missing Parts of Integer Partitions
Creators: name: Binner, Damanvir Singh
name: Rattan, Amarpreet
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: For positive integers $s$ and $L \geq 3$, Berkovich and Uncu (Ann. Comb. $23$ ($2019$) $263$--$284$) conjectured an inequality between the sizes of two closely related sets of partitions whose parts lie in the interval $\{s, \ldots, L+s\}$. Further restrictions are placed on the sets by specifying impermissible parts as well as a minimum part. The authors proved their conjecture for the cases $s=1$ and $s=2$. In the present article, we prove the conjecture for general $s$ by proving a stronger theorem. We also prove other related conjectures found in the same paper.
description: From Version 4: Referencing fixed. From Version 3: Minor error in proof of Theorem 12 fixed, notation change of main objects, error in Table 3 fixed. Minor typos and wording fixed
A concentração geográfica da produção de ovinos: comparativo dos resultados dos Censos 1995/96 e 2006
Creators: name: Lima, Roberto Arruda De Souza
name: Lima, Roberto Arruda De Souza
Publisher: name: Unknown
Year: 2008
Subjects: subject: Livestock Production/Industries
subject: ovinocultura
subject: concentração
subject: índice T de Theil
subject: sheep
subject: concentration
subject: Theil index

description: Os resultados preliminares do Censo Agropecuário mostraram que o rebanho ovino no Brasil é menor do que apontavam estudos anteriores. Para compreender esse resultado é necessário, entre outros estudos, verificar a evolução do efetivo no período. O objetivo do presente trabalho foi mensurar a concentração do rebanho ovino no Brasil, nos anos de 1995/96 e 2006. Para tanto, utilizou-se a metodologia do índice T de Theil e da análise tabular dos dados. Os resultados demonstraram redução da concentração do rebanho entre as Unidades da Federação. Apesar de se verificar concentração do rebanho pela análise tabular, esta não foi fortemente caracterizada pelo índice T de Theil, que mensurou a distribuição do rebanho em relação à área das Unidades da Federação. -------------------------------------------Preliminary results of the agricultural census showed that the sheep in Brazil is lower than previous studies indicated. This article aims to mensurate sheep concentration in Brazil, in the years of 1995/96 and 2006. Tabular analysis, estimation of Theil T index were used as the basic analytical techniques for the study. The results showed reduction of the concentration of the herd among units of the Federation. Analyzing by Theil index, this concentration was not strongly characterized. They differ because the Theil index consider the relationship between the sheep distribution and the area of the units of the Federation.
Gluonic Higgs Scalar, Abelianization and Monopoles in QCD -- Similarity and Difference between QCD in the MA Gauge and the NAH Theory
Creators: name: Suganuma, Hideo
name: Ichie, Hiroko
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the similarity and the difference between QCD in the maximally abelian (MA) gauge and the nonabelian Higgs (NAH) theory by introducing the ``gluonic Higgs scalar field'' $\vec ϕ(x)$ corresponding to the ``color-direction'' of the nonabelian gauge connection. The infrared-relevant gluonic mode in QCD can be extracted by the projection along the color-direction $\vec ϕ(x)$ like the NAH theory. This projection is manifestly gauge-invariant, and is mathematically equivalent to the ordinary MA projection. Since $\vec ϕ(x)$ obeys the adjoint gauge transformation and is diagonalized in the MA gauge, $\vec ϕ(x)$ behaves as the Higgs scalar in the NAH theory, and its hedgehog singularity provides the magnetic monopole in the MA gauge like the NAH theory. We observe this direct correspondence between the monopole appearing in the MA gauge and the hedgehog singularity of $\vec ϕ(x)$ in lattice QCD, when the gluon field is continuous as in the SU($N_c$) Landau gauge. In spite of several similarities, QCD in the MA gauge largely differs from the NAH theory in the two points: one is infrared monopole condensation, and the other is infrared enhancement of the abelian correlation due to monopole condensation.
description: Talk given at 16th International Conference on Particles and Nuclei (PANIC 02), Osaka, Japan, 30 Sep - 4 Oct 2002
Participant Information Sheet
Creators: name: Akthar, Nahima
name: Nayak, Dr. Smitha
name: P, Dr. Yogesh Pai
Publisher: name: figshare
Year: 2022
Subjects: subject: 150503 Marketing Management (incl. Strategy and Customer Relations)
subject: FOS: Economics and business

description: This is a participant information sheet. The participant will be informed about the purpose and procedures of the study by providing a participant information sheet
Investment strategy due to the minimization of portfolio noise level by observations of coarse-grained entropy
Creators: name: Urbanowicz, Krzysztof
name: Holyst, Janusz A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Using a recently developed method of noise level estimation that makes use of properties of the coarse grained-entropy we have analyzed the noise level for the Dow Jones index and a few stocks from the New York Stock Exchange. We have found that the noise level ranges from 40 to 80 percent of the signal variance. The condition of a minimal noise level has been applied to construct optimal portfolios from selected shares. We show that implementation of a corresponding threshold investment strategy leads to positive returns for historical data.
description: 6 pages, 1 figure, 1 table, Proceedings of the conference APFA4. See http://www.chaosandnoise.org
Securing Multi-User Broadcast Wiretap Channels with Finite CSI Feedback
Creators: name: Hyadi, Amal
name: Rezki, Zouheir
name: Alouini, Mohamed-Slim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this work, we investigate the problem of secure broadcasting over block-fading wiretap channels with limited channel knowledge at the transmitter. More particularly, we analyze the effect of having a finite rate feedback on the throughput of multi-user broadcast wiretap channels. We consider that the transmitter is only provided by a $b$-bits feedback of the main channel state information (CSI) sent by each legitimate receiver, at the beginning of each fading block, over error-free public links with limited capacity. Also, we assume that the transmitter is aware of the statistics of the eavesdropper's CSI but not of its channel's realizations. Under these assumptions of CSI uncertainty, we characterize the ergodic secrecy capacity of the system when a common message is broadcasted to all legitimate receivers, the ergodic secrecy sum-capacity when multiple independent messages are transmitted, and the ergodic secrecy capacity region for the broadcast channel with confidential messages (BCCM). In all three scenarios, we show that as long as the transmitter has some knowledge of the main CSI, obtained even through a 1-bit CSI feedback, a non-zero secrecy rate can still be achieved. The impact of having the feedback sent over a binary erasure channel (BEC) is also investigated for the BCCM case. Here again, and even with the possibility of having the feedback bits erased, a positive secrecy rate can still be achieved as long as the erasure event is not a probability-one event. An asymptotic analysis of the obtained results is provided for the high SNR regime, and the scaling law of the system, when the number of legitimate receivers is large, is also presented.
description: Accepted for publication in IEEE Transactions on Information Theory. arXiv admin note: text overlap with arXiv:1603.06877
title: "Il giudizio di Salomone", Maestro del Giudizio di Salomone (De Ribera Jusepe detto Spagnoletto ?), inv. 033 (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Puddu, Pier Ludovico
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
Disorder-assisted excitation localization in chirally coupled quantum emitters
Creators: name: Jen, H. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: One-dimensional quantum emitters with chiral couplings can exhibit nonreciprocal decay channels, along with light-induced dipole-dipole interactions mediated via an atom-waveguide interface. When the position disorders are introduced to such atomic array, we are able to identify the dynamical phase transition from excitation delocalization to localization, with an interplay between the directionality of decay rates and the strength of light-induced dipole-dipole interactions. Deep in the localization phase, its characteristic length decreases and saturates toward a reciprocal coupling regime, leading to a system dynamics whose ergodicity is strongly broken. We also find an interaction-driven re-entrant behavior of the localization phase and a reduction of level repulsion under strong disorder. The former coincides with a drop in the exponent of power-law decaying von Neumann entropy, which gives insights to a close relation between the preservation of entanglement and nonequilibrium dynamics in open quantum systems, while the latter presents a distinct narrow distribution of gap ratios in this particular disordered system.
description: 5 figures
Study of $B\to Λ\barΛK$ and $B\to Λ\barΛπ$
Creators: name: Geng, C. Q.
name: Hsiao, Y. K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study three-body charmless baryonic B decays of $B \to Λ\barΛP$ with $P=π$ and $K$ in the standard model. We find that the branching ratios of the $K$ modes are about one order of magnitude larger than those of the corresponding $π$ modes unlike the cases of $B\to p\bar p P$. Explicitly, we obtain that $Br(B^-\to Λ\bar ΛK^-)=(2.8\pm 0.2)\times 10^{-6}$ and $Br(\bar B^0 \toΛ\bar Λ\bar K^0)=(2.5\pm 0.3)\times 10^{-6}$. The former agrees well with the BELLE experimental measurement of $(2.91^{+0.90}_{-0.70}\pm 0.38)\times 10^{-6}$, while the latter should be seen at the ongoing B factories soon.
description: 11 pages, 2 figures, 2 tables, version to appear in Phys. Lett. B
Self-Consistent Theory of Halo Mergers
Creators: name: Benson, Andrew J.
name: Kamionkowski, Marc
name: Hassani, Steven H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The rate of merging of dark-matter halos is an absolutely essential ingredient for studies of both structure and galaxy formation. Remarkably, however, our quantitative understanding of the halo merger rate is still quite limited, and current analytic descriptions based upon the extended Press-Schechter formalism are fundamentally flawed. We show that a mathematically self-consistent merger rate must be consistent with the evolution of the halo abundance in the following sense: The merger rate must, when inserted into the Smoluchowski coagulation equation, yield the correct evolution of the halo abundance. We then describe a numerical technique to find merger rates that are consistent with this evolution. We present results from a preliminary study in which we find merger rates that reproduce the evolution of the halo abundance according to Press-Schechter for power-law power spectra. We discuss the limitations of the current approach and outline the questions that must still be answered before we have a fully consistent and correct theory of halo merger rates.
description: 13 pages, 8 figures, submitted to MNRAS. Version with full resolution figures available at http://www-astro.physics.ox.ac.uk/~abenson/Papers/smoluchow.pdf
Supplemental Material from Dilation of subglacial sediment governs incipient surge motion in glaciers with deformable beds
Creators: name: B. M. Minchew
name: C. R. Meyer
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Geophysics
subject: FOS: Earth and related environmental sciences
subject: 40602 Glaciology
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Glacier surges are quasi-periodic episodes of rapid ice flow that arise from increases in slip rate at the ice–bed interface. The mechanisms that trigger and sustain surges are not well understood. Here, we develop a new model of incipient surge motion for glaciers underlain by sediments to explore how surges may arise from slip instabilities within a thin layer of saturated, deforming subglacial till. Our model represents the evolution of internal friction, porosity and pore water pressure within the till as functions of the rate and history of shear deformation, and couples the till mechanics to a simple ice-flow model. Changes in pore water pressure govern incipient surge motion, with less permeable till facilitating surging because dilation-driven reductions in pore water pressure slow the rate at which till tends towards a new steady state, thereby allowing time for the glacier to thin dynamically. The reduction of overburden (and thus effective) pressure at the bed caused by dynamic thinning of the glacier sustains surge acceleration in our model. The need for changes in both the hydromechanical properties of the till and the thickness of the glacier creates restrictive conditions for surge motion that are consistent with the rarity of surge-type glaciers and their geographical clustering.
On the functoriality of cohomology of categories
Creators: name: Muro, Fernando
Publisher: name: arXiv
Year: 2004
Subjects: subject: Category Theory (math.CT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 18G60, 18D05, 16E05

description: In this paper we show that the Baues-Wirsching complex used to define cohomology of categories is a 2-functor from a certain 2-category of natural systems of abelian groups to the 2-category of chain complexes, chain homomorphism and relative homotopy classes of chain homotopies. As a consequence we derive (co)localization theorems for this cohomology.
description: 15 pages
Semi-nonparametric estimation of extended ordered probit models
Creators: name: Stewart, Mark B.
name: Stewart, Mark B.
Publisher: name: Unknown
Year: 2004
Subjects: subject: Research Methods/ Statistical Methods
subject: ordered response models
subject: ordered probit
subject: semi-nonparametric estimation

description: This paper presents a semi-nonparametric estimator for a series of generalized models that nest the ordered probit model and thereby relax the distributional assumption in that model. It describes a new Stata command for fitting such models and presents an illustration of the approach.
Psilotrema_simillimum_genes_level_analysis
Creators: name: Nesterenko, Maksim
Publisher: name: figshare
Year: 2020
Subjects: subject: 60102 Bioinformatics
subject: FOS: Computer and information sciences
subject: Parasitology
subject: 60808 Invertebrate Biology
subject: FOS: Biological sciences

description: Summary table with all obtained results of Psilotrema simillimum (Trematoda, Psilostomatidae) reference transcriptome bioinformatic analysis. Column descriptions: 1) Gene_ID - ID of gene; 2) Transcript_ID - ID of the assembled transcript; 3) Protein_ID - ID of the predicted protein; 4) Orthogroup - ID of the orthogroup group in which the sequence was included; 5) NCBInt - best hit with NCBI nucleotide database; 6) NCBInr - best hit with NCBI non-redundant protein database; 7) SwissProt - best hit with SwissProt protein database, 8) NCBInt|NCBInr|SwissProt_identity - best hit identity percentage; 9) Domain_arch - reconstructed protein architecture based on analysis of comparison results with a PfamA database; 10) EggNOG:Preferred_name - Predicted gene name; 11) EggNOG:GO_terms - comma delimited list of predicted Gene Ontology terms; 12) EggNOG:EC_number - the Enzyme Commission number (EC number); 13) EggNOG:KEGG_KO - comma delimited list of predicted KEGG KOs; 14) EggNOG:KEGG_Pathway - comma delimited list of predicted KEGG Pathways; 15) EggNOG:KEGG_Module - predicted KEGG Module; 16) EggNOG:KEGG_Reaction - predicted KEGG Reaction; 17) EggNOG:rclass - predicted KEGG Reaction Class; 18) EggNOG:BRITE - predicted KEGG BRITE; 19) EggNOG:KEGG_TC - predicted KEGG TC; 20) EggNOG:CAZy - best hit with Carbohydrate-Active enZYmes Database; 21) EggNOG:BiGG_Reaction - comma delimited list of predicted BiGG metabolic reactions; 22) EggNOG:OG - comma delimited list of matching eggNOG Orthologous Groups; 23) EggNOG:COG_cat - COG functional category inferred from best matching OG; 24) EggNOG:Description - eggNOG functional description inferred from best matching OG; 25) Rediae|Cercariae|Marita_scaledTPM - the value of expression in rediae, cercariae or adult worm stages, respectively, in scaled TPM (Transcripts Per Million) units which were averaged between two biological replicates; 26) Specificity - 'R'|'C'|'M' means that the sequence have preferential expression in redia, cercaria or adult worm stage, respectively, 'H' means that this gene are probably can be classified as “housekeeping”; 27) Cluster – ID of co-expressed gene cluster
Simple homotopy types of Hom-complexes, neighborhood complexes, Lovász complexes, and atom crosscut complexes
Creators: name: Kozlov, Dmitry N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Topology (math.AT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: primary: 57Q10; secondary 05C15, 68R10

description: In this paper we provide concrete combinatorial formal deformation algorithms, namely sequences of elementary collapses and expansions, which relate various previously extensively studied families of combinatorially defined polyhedral complexes. To start with, we give a sequence of elementary collapses leading from the barycentric subdivision of the neighborhood complex to the Lovász complex of a graph. Then, for an arbitrary lattice ${\mathcal L}$ we describe a formal deformation of the barycentric subdivision of the atom crosscut complex $Γ({\mathcal L})$ to its order complex $Δ(\bar{\mathcal L})$. We proceed by proving that the complex of sets bounded from below ${\mathcal J}({\mathcal L})$ can also be collapsed to $Δ(\bar{\mathcal L})$. Finally, as a pinnacle of our project, we apply all these results to certain graph complexes. Namely, by describing an explicit formal deformation, we prove that, for any graph $G$, the neighborhood complex ${\mathcal N}(G)$ and the polyhedral complex $\text{\tt Hom}(K_2,G)$ have the same simple homotopy type in the sense of Whitehead.
description: The revised version to appear in Topology Appl
Kondo Behavior of U in CaB$_6$
Creators: name: Wigger, G. A.
name: Felder, E.
name: Weyeneth, S.
name: Ott, H. R.
name: Fisk, Z.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Replacing U for Ca in semiconducting CaB$_6$ at the few at.% level induces metallic behaviour and Kondo-type phenomena at low temperatures, a rather unusual feature for U impurities in metallic hosts. For Ca$_{0.992}$U$_{0.008}$B$_6$, the resistance minimum occurs at $T$ = 17 K. The subsequent characteristic logarithmic increase of the resistivity with decreasing temperature merges into the expected $T^2$ dependence below 0.8 K. Data of the low-temperature specific heat and the magnetization are analyzed by employing a simple resonance-level model. Analogous measurements on LaB$_6$ with a small amount of U revealed no traces of Kondo behavior, above 0.4 K.
description: 4 pages, 4 figures, submitted for publication to Europhysics Letters
Stability of Few-Charge Systems in Quantum Mechanics
Creators: name: Armour, E. A. G.
name: Richard, J. -M.
name: Varga, K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider non-relativistic systems in quantum mechanics interacting through the Coulomb potential, and discuss the existence of bound states which are stable against spontaneous dissociation into smaller atoms or ions. We review the studies that have been made of specific mass configurations and also the properties of the domain of stability in the space of masses or inverse masses. These rigorous results are supplemented by numerical investigations using accurate variational methods. A section is devoted to systems of three arbitrary charges and another to molecules in a world with two space-dimensions.
description: 101 pages, review article
FIML estimation of an endogenous switching model for count data
Creators: name: Miranda, Alfonso
name: Miranda, Alfonso
Publisher: name: Unknown
Year: 2004
Subjects: subject: Research Methods/ Statistical Methods
subject: count models
subject: endogenous switch
subject: sample selection

description: This paper presents code for fitting a FIML endogenous switching Poisson count model for cross-sectional data in Stata 7: the espoisson command. The Poisson process depends on an unobserved heterogeneity term, ε; a set of explanatory variables, x; and an endogenous dummy, d. The endogenous dummy depends on an unobserved random term, v. Correlation between ε and v is allowed. If a model with exogenous d is fitted instead, correlation between ε and v will result in simultaneous equation bias. The endogenous switching model corrects this problem. After describing the underlying econometric theory behind the command, an example is discussed.
Analyzing distances
Creators: name: Fenty, Justin
name: Fenty, Justin
Publisher: name: Unknown
Year: 2004
Subjects: subject: Research Methods/ Statistical Methods
subject: multivariate data
subject: principal coordinate analysis
subject: multidimensional scaling
subject: Euclidean distance
subject: Gower's general coefficient of similarity
subject: eigenvectors
subject: analysis of distance
subject: MANOVA
subject: partitioning of squared distance
subject: randomization tests
subject: contrasts
subject: idempotent matrices

description: Gower and Krzanowski (1999) described the analysis of a multivariate dataset that violated the assumptions of normality for multivariate analysis of variance. They developed a method comprising two aspects: a graphical representation of the points in a fewer number of dimensions, known as principal coordinate analysis; and a technique similar to MANOVA except that it was based on partitioning the distances between subjects, rather than sums of squares, and did not assume that the data followed any particular distribution. This article summarizes both aspects of their analysis and describes the Stata pco and aod commands, which perform principal coordinate analysis and analysis of distance.
Canonical structure of 3D gravity with torsion
Creators: name: Blagojevic, M.
name: Cvetkovic, B.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the canonical structure of the topological 3D gravity with torsion, assuming the anti-de Sitter asymptotic conditions. It is shown that the Poisson bracket algebra of the canonical generators has the form of two independent Virasoro algebras with classical central charges. In contrast to the case of general relativity with a cosmological constant, the values of the central charges are different from each other.
description: LaTeX, 21 pages
Aharonov-Bohm interference as a probe of Majorana fermions
Creators: name: Bartolo, T. C.
name: Smith, J. S.
name: Muralidharan, B.
name: Müller, C.
name: Stace, T. M.
name: Cole, J. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Majorana fermions act as their own antiparticle, and they have long been thought to be confined to the realm of pure theory. However, interest in them has recently resurfaced, as it was realized through the work of Kitaev that some experimentally accessible condensed matter systems can host these exotic excitations as bound states on the boundaries of 1D chains, and that their topological and non-abelian nature holds promise for quantum computation. Unambiguously detecting the experimental signatures of Majorana bound states has turned out to be challenging, as many other phenomena lead to similar experimental behaviour. Here, we computationally study a ring comprised of two Kitaev model chains with tunnel coupling between them, where an applied magnetic field allows for Aharonov-Bohm interference in transport through the resulting ring structure. We use a non-equilibrium Green's function technique to analyse the transport properties of the ring in both the presence and absence of Majorana zero modes. Further, we show that these results are robust against weak disorder in the presence of an applied magnetic field. This computational model suggests another signature for the presence of these topologically protected bound states can be found in the magnetic field dependence of devices with loop geometries.
description: 12 pages, 10 figures. Included new section about disorder in the nanowires and the effect of this on our results
Standardizing anthropometric measures in children and adolescents with new functions for egen
Creators: name: Vidmar, Suzanna
name: Carlin, John B.
name: Hesketh, Kylie
name: Cole, Tim
name: Vidmar, Suzanna
name: Carlin, John B.
name: Hesketh, Kylie
name: Cole, Tim
Publisher: name: Unknown
Year: 2004
Subjects: subject: Research Methods/ Statistical Methods
subject: z-scores
subject: LMS
subject: egen

description: A new function for egen has been developed to allow transformation of child anthropometric data to z-scores using the LMS method and the reference data available from the 1990 British Growth Reference and the 2000 US CDC Growth Reference. An additional function allows for children to be categorized according to body mass index (weight/height2) using international cutoff points recommended by the Childhood Obesity Working Group of the International Obesity Taskforce.