cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simultaneous Measurement of Thermal Conductivity, Heat Capacity, and Interfacial Thermal Conductance by Leveraging Negative Delay-Time Data in Time-Domain Thermoreflectance
Creators: name: Zhang, Mingzhen
name: Chen, Tao
name: Zeng, Ao
name: Tang, Jialin
name: Guo, Ruiqiang
name: Jiang, Puqing
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Time-domain thermoreflectance (TDTR) is a widely used technique for characterizing the thermal properties of bulk and thin-film materials. Traditional TDTR analyses typically focus on positive delay time data for fitting, often requiring multiple-frequency measurements to simultaneously determine thermal conductivity and heat capacity. However, this multiple-frequency approach is cumbersome and may introduce inaccuracies due to inconsistencies across different frequency measurements. In this study, we propose a novel solution to these challenges by harnessing the often-overlooked negative delay time data in TDTR. By integrating these data points, we offer a streamlined, single-frequency method that simultaneously measures thermal conductivity, heat capacity, and interface thermal conductance for both bulk and thin-film materials, enhancing measurement efficiency and accuracy. We demonstrate the effectiveness of this method by measuring several bulk samples including sapphire, silicon, diamond, and Si0.992Ge0.008, and several thin-film samples including a 1.76-μm-thick gallium nitride (GaN) film epitaxially grown on a silicon substrate, a 320-nm-thick gallium oxide (ε-Ga2O3) film epitaxially grown on a silicon carbide substrate, and a 330-nm-thick tantalum nitride (TaN) film deposited on a sapphire substrate, all coated with an aluminum (Al) transducer layer on the surface. Our results show that the new method accurately determines the thermal conductivity and heat capacity of these samples as well as the Al/sample interface thermal conductance using a single modulation frequency, except for the Si0.992Ge0.008 sample. This study sheds light on the untapped potential of TDTR, offering a new, efficient, and accurate avenue for thermal analysis in material science.
Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires
Creators: name: Andersen, I. M.
name: Wolf, D.
name: Rodriguez, L. A.
name: Lubk, A.
name: Oliveros, D.
name: Bran, C.
name: Niermann, T.
name: Rößler, U. K.
name: Vazquez, M.
name: Gatel, C.
name: Snoeck, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Cylindrical magnetic nanowires with large transversal magnetocrystalline anisotropy have been shown to sustain non-trivial magnetic configurations resulting from the interplay of spatial confinement, exchange, and anisotropies. Exploiting these peculiar 3D spin configurations and their solitonic inhomogeneities are prospected to improve magnetization switching in future spintronics, such as power-saving magnetic memory and logic applications. Here we employ holographic vector field electron tomography to reconstruct the remanent magnetic states in CoNi nanowires with 10 nm resolution in 3D, with a particular focus on domain walls between remanent states and ubiquitous real-structure effects stemming from irregular morphology and anisotropy variations. By tuning the applied magnetic field direction, both longitudinal and transverse multi-vortex states of different chiralities and peculiar 3D features such as shifted vortex cores are stabilized. The chiral domain wall between the longitudinal vortices of opposite chiralities exhibits a complex 3D shape characterized by a push out of the central vortex line and a gain in exchange and anisotropy energy. A similar complex 3D texture, including bent vortex lines, forms at the domain boundary between transverse-vortex states and longitudinal configurations. Micromagnetic simulations allow an understanding of the origin of the observed complex magnetic states.
description: 22 pages, 5 figures, preprent of original paper
Quantum Structure in Cognition
Creators: name: Aerts, Diederik
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The broader scope of our investigations is the search for the way in which concepts and their combinations carry and influence meaning and what this implies for human thought. More specifically, we examine the use of the mathematical formalism of quantum mechanics as a modeling instrument and propose a general mathematical modeling scheme for the combinations of concepts. We point out that quantum mechanical principles, such as superposition and interference, are at the origin of specific effects in cognition related to concept combinations, such as the guppy effect and the overextension and underextension of membership weights of items. We work out a concrete quantum mechanical model for a large set of experimental data of membership weights with overextension and underextension of items with respect to the conjunction and disjunction of pairs of concepts, and show that no classical model is possible for these data. We put forward an explanation by linking the presence of quantum aspects that model concept combinations to the basic process of concept formation. We investigate the implications of our quantum modeling scheme for the structure of human thought, and show the presence of a two-layer structure consisting of a classical logical layer and a quantum conceptual layer. We consider connections between our findings and phenomena such as the disjunction effect and the conjunction fallacy in decision theory, violations of the sure thing principle, and the Allais and Elsberg paradoxes in economics.
description: 58 pages, 1 figure. Reworked version after review process
N=8 superconformal mechanics: direct construction
Creators: name: Krivonos, Sergey
name: Nersessian, Armen
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present paper we constructed the supercharges and Hamiltonians for all variants of superconformal mechanics associated with the superalgebras $osp(8|2), {\mathfrak F(4)}, osp(4^\star |4)$, and $su(1,1|4)$. The fermionic and bosonic fields involved were arranged into generators spanning $so(8), so(7), so(5)\oplus su(2)$ and $su(4) \oplus u(1)$ $R$-symmetry currents of the corresponding superconformal algebras. The bosonic and fermionic parts of these $R$-symmetry generators separately define the constants of motion and form the same algebras. The angular part of the supercharges defining the system have the structure ``$(R-symmetry\; generators)\, \times\, fermions$'' while the angular part of Hamiltonian is just a proper sum of full Casimir operators and its purely bosonic and fermionic parts.
 We also constructed the explicit embedding of the algebras $so(7), \, so(5) \times su(2)$, and $su(4)\times u(1)$ into $so(8)$, which provide the possibility to explicitly construct the corresponding supercharges.
description: 14 pages, revised version, to appear in Phys Lett B
Погребенные судьбы Ужас, молитва, клятва, стол и топор… Картинки из памяти
Creators: name: Егана, Алиева
Publisher: name: Zenodo
Year: 2023

description: Губа, 31 марта 1918 годаГород погружен в глубочайшую тишину. Ранним утром вооруженные мужчиныждут на городском кладбище вражеской атаки. Неизвестно откуда ударит враг. Срединих Муртуза – дядя моего деда. Укрывшись за одной из могил с охотничьим ружьем вруках, он готов сделать всё возможное, чтобы защитить город.Говорят, Муртуза был симпатичным, храбрым, отважным, буйным молодым че-ловеком, который не мирился с несправедливостью. По причине своего буйства, неслушаясь наставления старших, он в ночной темноте закуривает папиросу. Тлеющаяпапироса выдает его врагу и…Женщины, дети, старики прячутся в подвалах своих домов. Вооруженный дозубов враг обходит улицу за улицей, квартал за кварталом, зверски убивает стариков,детей, женщин, жестоко расправляется с ними. Дом и амбары моего прадеда купцаМешеди Алиаббаса Оруджева горят уже седьмой день, на пепелище все еще тлеютугли. Дом и имущество Мешеди Алиаббаса, пользующегося большим уважением в го-роде, сожжены из-за того, что он не подчинился приказам ворвавшихся в город армян.Город окутан дымом пожарищ и наполнен запахом смерти.В подвале нашего дома, расположенного возле губинской Старой бани, спрята-лись женщины нашей семьи. Среди них моя бабушка, которой тогда был всего месяцот роду, ее мать, сестры матери. Женщины замерли, затаив дыхание. И тут они услы-шали как вооруженная банда армян пинком ноги ворота распахнул ворота. Женщиныпонимают, что враг уже во дворе. Воздев руки к небу, они клянутся: «Всевышний, мыобращаемся к Тебе! Если враг нас не обнаружит, если мы выберемся невредимыми изэтого подвала, клянемся до конца жизни не расчесывать и ничем не украшать свои во-лосы». В этом момент один из головорезов-армян подходит к столу в саду и со всейсилы вонзает свой топор в стол. Топор, пробив стол, застревает в столешнице. Богвнял их молитвам. Убийца и головорез, чьи глаза застилает кровь, смотрит по сторо-нам и, словно ничего не видя и не слыша, покидает двор…Наутро на кладбище находят тело молодого Муртузы, смертельно раненого влоб… Он только-только закурил папиросу и тут же пал от вражеской пули.
Hydrodynamics of quantum entropies in Ising chains with linear dissipation
Creators: name: Alba, Vincenzo
name: Carollo, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the dynamics of quantum information and of quantum correlations after a quantum quench, in transverse field Ising chains subject to generic linear dissipation. As we show, in the hydrodynamic limit of long times, large system sizes, and weak dissipation, entropy-related quantities -- such as the von Neumann entropy, the Rényi entropies, and the associated mutual information -- admit a simple description within the so-called quasiparticle picture. Specifically, we analytically derive a hydrodynamic formula, recently conjectured for generic noninteracting systems, which allows us to demonstrate a universal feature of the dynamics of correlations in such dissipative noninteracting system. For any possible dissipation, the mutual information grows up to a time scale that is proportional to the inverse dissipation rate, and then decreases, always vanishing in the long time limit. In passing, we provide analytic formulas describing the time-dependence of arbitrary functions of the fermionic covariance matrix, in the hydrodynamic limit.
description: 33 pages, 9 figures. Invited contribution to the special issue "Hydrodynamics of Low-Dimensional Quantum Systems" of J. Phys. A. Few typos corrected. As published
Evidence of structural strain in epitaxial graphene layers on 6H-SiC(0001)
Creators: name: Ferralis, Nicola
name: Maboudian, Roya
name: Carraro, Carlo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The early stages of epitaxial graphene layer growth on the Si-terminated 6H-SiC(0001) are investigated by Auger electron spectroscopy (AES) and depolarized Raman spectroscopy. The selection of the depolarized component of the scattered light results in a significant increase in the C-C bond signal over the second order SiC Raman signal, which allows to resolve submonolayer growth, including individual, localized C=C dimers in a diamond-like carbon matrix for AES C/Si ratio of $\sim$3, and a strained graphene layer with delocalized electrons and Dirac single-band dispersion for AES C/Si ratio $>$6. The linear strain, measured at room temperature, is found to be compressive, which can be attributed to the large difference between the coefficients of thermal expansion of graphene and SiC. The magnitude of the compressive strain can be varied by adjusting the growth time at fixed annealing temperature.
description: 4 pages, 2 images - final version
Rapid Rotation of Polarization Orientations in PSR B1919+21's Single Pulses: Implications On Pulsar's Magnetospheric Dynamics
Creators: name: Cao, Shunshun
name: Jiang, Jinchen
name: Dyks, Jaroslaw
name: Lee, Kejia
name: Lu, Jiguang
name: Oswald, Lucy S.
name: Wang, Weiyang
name: Xu, Renxin
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We analyze and model rapid rotations of polarization orientations in PSR B1919+21's single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data. In more than one-third of B1919+21's single pulses, the polarization position angle (PA) is found to rotate quasi-monotonically with pulse longitude, by over 180 degrees or even 360 degrees. Some single pulse PA even rotates by over 540 degrees. Most of these quasi-monotonic PA curves have negative slopes with respect to pulse longitude. Oscillations of circular polarization fraction accompany these PA rotations. This rapid rotation could be induced by a quick change of phase lag between two normal wave modes within an individual pulse. We propose a phenomenological model to reproduce the observed polarization rotations in single pulses, and calculate phase lags in a dipolar magnetic field of an aligned rotating pulsar, with a dispersion relation of orthogonal wave modes in strongly magnetized electron-positron plasma. According to the dispersion relation, the weak frequency dependence of observed polarization rotation requires small angles between the radio wavevector and local magnetic fields, which requires the radio emission height to be low, on the order of 10 times neutron star radius.
description: 15 pages, 8 figures. Published by ApJ
Spin-Current Instability at a Magnetic Domain Wall in a Ferromagnetic Superfluid: a Generation Mechanism of Eccentric Fractional Skyrmions
Creators: name: Takeuchi, Hiromitsu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spinful superfluids of ultracold atoms are ideal for investigating the intrinsic properties of spin current and texture because they are realized in an isolated, nondissipative system free from impurities, dislocations, and thermal fluctuations. This study theoretically reveals the impact of spin current on a magnetic domain wall in spinful superfluids. An exact wall solution is obtained in the ferromagnetic phase of a spin-1 Bose--Einstein condensate with easy-axis anisotropy at zero temperature. The bosonic-quasiparticle mechanics analytically show that the spin current along the wall becomes unstable if the velocity exceeds the critical spin-current velocities, leading to complicated situations because of the competition between transverse magnons and ripplons. Our direct numerical simulation reveals that this system has a mechanism to generate an eccentric fractional skyrmion, which has a fractional topological charge, but its texture is not similar to that of a meron. This mechanism is in contrast to the generation of conventional skyrmions in easy-axis magnets. The theoretical findings can be examined in the same situation as in a recent experiment on ultracold atoms. In terms of the universality of spontaneous symmetry breaking, unexplored similar phenomena are expected in different physical systems with the same broken symmetry.
description: 16 pages, 6 figures Movies S1, S2, S3, and S4 are available from https://youtube.com/playlist?list=PLGohTwOqxpryJNIJj9K2IGj0nZ9OkE1Xh
Plasma mechanisms of resonant terahertz detection in two-dimensional electron channel with split gates
Creators: name: Ryzhii, V.
name: Satou, A.
name: Otsuji, T.
name: Shur, M. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We analyze the operation of a resonant detector of terahertz (THz) radiation based on a two-dimensional electron gas (2DEG) channel with split gates. The side gates are used for the excitation of plasma oscillations by incoming THz radiation and control of the resonant plasma frequencies. The central gate provides the potential barrier separating the source and drain portions of the 2DEG channel. Two possible mechanisms of the detection are considered: (1) modulation of the ac potential drop across the barrier and (2) heating of the 2DEG due to the resonant plasma-assisted absorption of THz radiation followed by an increase in thermionic dc current through the barrier. Using the device model we calculate the frequency and temperature dependences of the detector responsivity associated with both dynamic and heating (bolometric) mechanisms. It is shown that the dynamic mechanisms dominates at elevated temperatures, whereas the heating mechanism provides larger contribution at low temperatures, T=35-40 K.
description: 7 pages, 4 figures
Emergence of oscillations in fixed energy sandpile models on complex networks
Creators: name: Fazli, Davood
name: Azimi-Tafreshi, Nahid
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: -

description: Fixed-energy sandpile (FES) models, introduced to understand the self-organized criticality, show a continuous phase transition between absorbing and active phases. In this work, we study the dynamics of the deterministic FES models on random networks. We observe that close to absorbing transition the density of active nodes oscillates and nodes topple in synchrony. The deterministic toppling rule and the small-world property of random networks lead to the emergence of sustained oscillations. The amplitude of oscillations becomes larger with increasing the value of network randomness. The bifurcation diagram for the density of active nodes is obtained. We use the activity-dependent rewiring rule and show that the interplay between the network structure and the FES dynamics leads to the emergence of a bistable region with a first-order transition between the absorbing and active states. Furthermore during the rewiring, the ordered activation pattern of the nodes is broken, which causes the oscillations to disappear.
description: 8 pages, 11 figures
Lasianthus congesticymus Zhu 2000
Creators: name: Napiroon, Tiwtawat
name: Chayamarit, Kongkanda
name: Dawson, Sally
name: Till, Walter
name: Balslev, Henrik
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Gentianales
Rubiaceae
Lasianthus
Lasianthus congesticymus

description: 10. Lasianthus congesticymus Zhu (2000b:124). Type: ― THAILAND. Nakhon Si Thammarat, Khao Luang National Park, 24 August 1995, K. Larsen et al. 45955 (holotype AAU!).
T hailand: ―PENINSULAR. Phatthalung: Khaopu-Khaoya National Park, 10–11 July 1993, C. Puff & K. Sridith 930711-1/1 (AAU, BKF, PSU, WU). Songkhla: Ton Nga Chang Wildlife Sanctuary, 13 August 1995, K. Larsen, et al. 45522 (AAU, BKF, PSU).
Distribution: ― Malaysia (Borneo), Thailand (Peninsular).
Ecology: —Moist evergreen forest at an elevation of 700‒1200 m.
Notes: ― Lasianthus congesticymus was found for the first time among herbarium specimens collected in Peninsular Thailand. Morphologically it is similar to L. subcalvus Craib (1933:27) but it differs in having ellipsoid and rugose drupes that are 5 mm long, while L. subcalvus has fusiform drupes that are 1‒2 cm long. Lasianthus congesticymus is also similar to L. lancifolius Hook.f. (1880:187) in having globose drupes that are mostly glabrous and smooth (Zhu 2001). In Thailand, Lasianthus congesticymus and L. subcalvus occur in the Peninsular region whereas L. lancifolius is found in the North Eastern region.
description: Published as part of Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, pp. 1-38 in Phytotaxa 439 (1) on page 12, DOI: 10.11646/phytotaxa.439.1.1, http://zenodo.org/record/13873503
title: The characterisation of porous media
Creators: name: Beausire Wyatt Webber, John
Publisher: name: University of Kent
Year: 2021

description: This thesis describes the characterisation of a range of sol-gel silicas, mainly by the physical techniques of NMR cryoporometry, density and imbibation measurements and Small Angle Neutron Scattering. The developments made to these techniques as part of this work include Construction of the frst full cool/warm cycle automated NMR cryoporometer, with continual pore size distribution graphing. Calibration of melting point constants with respect to gas-adsorption and neutron scattering. Detailed characterisation of the thermal properties of the cryoporometer. Development and measurement of the rst multi-dimensionally resolved pore size maps by NMR cryoporometry. Demonstration that simple density and imbibation measurements can, when combined with models, provide a wealth of information concerning the silicas. Development of novel continuous medium Monte-Carlo integration methods to calculate the solid-solid density correlation function for porous media, showing excellent agreement with experimental SANS results. In particular, with the second point, there has been an attempt to use SANS to provide an absolute calibration scale for pore size, nominally given by gas-adsorption.
Bose-Einstein condensation in semiconductors: the key role of dark excitons
Creators: name: Combescot, Monique
name: Betbeder-Matibet, Odile
name: Combescot, Roland
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The non elementary-boson nature of excitons controls Bose-Einstein condensation in semiconductors. Composite excitons interact predominantly through Pauli exclusion; this produces dramatic couplings between bright and dark states. In microcavities, where bright excitons and photons form polaritons, they force the condensate to be linearly polarized--as observed. In bulk, they also force linear polarization, but of dark states, due to interband Coulomb scatterings. To evidence this dark condensate, we thus need indirect processes, like the shift it induces on the (bright) exciton line.
description: 4 pages, 3 figures
The commissural projection of the hilus of the area dentata in the rat
Creators: name: Willcox, John Edward Francis
Publisher: name: University of British Columbia
Year: 2010

description: Stimulation of the commissural afferents to the hippocampal formation evoked responses in the regio superior, regio inferior, and area dentata. Two waves were found in the stratum moleculare of the fascia dentata: the presynaptic volley (MN1), and the population EPSP (MN2). MN2 was caused by simultaneous activity in both the commissural and association fibres. Granule cells were reliably evoked by a commissural stimulus. The excitation of a granule cell was followed by a long period of inhibition. The long period of inhibition and the absence of a granule cell population spike were attributed to feed-forward inhibition. The commissural current source in the area dentata was hidden by field potentials generated in adjacent structures that were activated simultaneously by the commissural stimulus. In the hilar region a compound pyramidal cell action potential that had both orthodromic and antidromic components was found (HN2). A presynaptic volley in the commissural afferents was located in the commissural terminal zone of the regio inferior (HN1). The P wave was first misinterpreted as the commissural current source in the granule cells, but further investigation localized it to the stratum pyramidale of the regio inferior. It was not definitely characterized, but it appeared to be due to passive recovery processes that occurred after the propagation of action potentials in the pyramidal cells of the regio inferior. Hilar neurons project to the contralateral and ipsilateral area dentata, and to the ipsilateral and/or the contralateral regio superior.
Subsurface Meridional Circulation in the Active Belts
Creators: name: Hernandez, I. Gonzalez
name: Kholikov, S.
name: Hill, F.
name: Howe, R.
name: Komm, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Temporal variations of the subsurface meridional flow with the solar cycle have been reported by several authors. The measurements are typically averaged over periods of time during which surface magnetic activity existed in the regions were the velocities are calculated. The present work examines the possible contamination of these measurements due to the extra velocity fields associated with active regions plus the uncertainties in the data obtained where strong magnetic fields are present. We perform a systematic analysis of more than five years of GONG data and compare meridional flows obtained by ring-diagram analysis before and after removing the areas of strong magnetic field. The overall trend of increased amplitude of the meridional flow towards solar minimum remains after removal of large areas associated with surface activity. We also find residual circulation toward the active belts that persist even after the removal of the surface magnetic activity, suggesting the existence of a global pattern or longitudinally-located organized flows.
description: 12 pages, 6 figures, Submitted to Solar Physics. Accepted (08/25/2008)
Integrable Deformations of Sigma Models
Creators: name: Hoare, Ben
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: In this pedagogical review we introduce systematic approaches to deforming integrable 2-dimensional sigma models. We use the integrable principal chiral model and the conformal Wess-Zumino-Witten model as our starting points and explore their Yang-Baxter and current-current deformations. There is an intricate web of relations between these models based on underlying algebraic structures and worldsheet dualities, which is highlighted throughout. We finish with a discussion of the generalisation to other symmetric integrable models, including some original results related to Z T cosets and their deformations, and the application to string theory. This review is based on notes written for lectures delivered at the school "Integrability, Dualities and Deformations", which ran from 23 to 27 August 2021 in Santiago de Compostela and virtually.
description: v3: 68 pages, minor comments and references added, matches published version
pre-trained weights of VGG16
Creators: name: Fraliphsoft
Publisher: name: Zenodo
Year: 2021

description: The pre-trained models from VGG16. Even though you could find pre-trained models of VGG16 anywhere, it will still be useful to have a backup which be guaranteed to be absolutely same with some versions. Original storage can be accessed in: https://www.dropbox.com/s/s3brpk0bdq60nyb/vgg16_caffe.pth?dl=0 or https://filebox.ece.vt.edu/~jw2yang/faster-rcnn/pretrained-base-models/vgg16_caffe.pth
Time-Series Methods for Forecasting and Modeling Uncertainty in the Food Price Outlook
Creators: name: MacLachlan, Matthew
name: Chelius, Carolyn
name: Short, Gianna
name: MacLachlan, Matthew
name: Chelius, Carolyn
name: Short, Gianna
Publisher: name: Unknown
Year: 2022
Subjects: subject: Consumer/Household Economics
subject: Demand and Price Analysis
subject: Research Methods/ Statistical Methods
subject: Risk and Uncertainty
subject: Autoregressive integrated moving average (ARIMA)
subject: Consumer Price Index (CPI)
subject: food prices
subject: Food Price Outlook (FPO)
subject: forecasting
subject: model selection
subject: Producer Price Index (PPI)
subject: time-series econometrics
subject: uncertainty

description: This technical bulletin describes a time-series-based approach for forecasting food prices that includes prediction intervals to communicate uncertainty. The performance of forecasts created with this approach was compared to that of previously published USDA, Economic Research Service (ERS) Food Price Outlook (FPO) forecast ranges. The methods in this new approach are intended to be used in FPO data releases that provide monthly forecasts of annual food price changes and may also prove useful in other forecasting endeavors. The new approach used an autoregressive integrated moving average (ARIMA) model that was selected based on performance (information loss), generating a more accurate forecast than previously used methods as measured by root-mean-square errors. With the parameter estimates and estimated error distribution from the optimal ARIMA model, Monte Carlo simulations are used to develop prediction intervals, which reflect uncertainty about future food prices. These prediction intervals more often included the actual annual price changes than the archived fore-cast ranges. On average, the prediction intervals also included the actual annual price change earlier in the forecasting process. These properties generally held whether we used a higher (95 percent) or lower (90 percent) confidence level. The use of standardized econometric models and model selection also allowed for the inclusion of data not currently included in FPO. The methods easily tested whether including external variables improved forecast accuracy or could be used to create new forecasts. This report considered new price change forecasts of apples, seafood, and limited-service restaurants in 2020 and the potential forecast performance improvement from incorporating futures prices as case studies.
Statistical Learning for Fluid Flows: Sparse Fourier divergence-free approximations
Creators: name: Espath, Luis
name: Kabanov, Dmitry
name: Kiessling, Jonas
name: Tempone, Raúl
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We reconstruct the velocity field of incompressible flows given a finite set of measurements. For the spatial approximation, we introduce the Sparse Fourier divergence-free (SFdf) approximation based on a discrete $L^2$ projection. Within this physics-informed type of statistical learning framework, we adaptively build a sparse set of Fourier basis functions with corresponding coefficients by solving a sequence of minimization problems where the set of basis functions is augmented greedily at each optimization problem. We regularize our minimization problems with the seminorm of the fractional Sobolev space in a Tikhonov fashion. In the Fourier setting, the incompressibility (divergence-free) constraint becomes a finite set of linear algebraic equations. We couple our spatial approximation with the truncated Singular Value Decomposition (SVD) of the flow measurements for temporal compression. Our computational framework thus combines supervised and unsupervised learning techniques. We assess the capabilities of our method in various numerical examples arising in fluid mechanics.
Lasianthus conspicuus Ridley 1909
Creators: name: Napiroon, Tiwtawat
name: Chayamarit, Kongkanda
name: Dawson, Sally
name: Till, Walter
name: Balslev, Henrik
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Gentianales
Rubiaceae
Lasianthus
Lasianthus conspicuus

description: 11. Lasianthus conspicuus Ridley (1909:36). Type: ― MALAYSIA. Pahang, November 1908, H. N. Ridley 13628 (holotype SING0059764 image!; isotype BM001190977 image!; syntype K000763890!).
T hailand: —SOUTH-WESTERN. Kanchanaburi: 8 November 2001, M. van De Bult 488 (BKF). PENINSULAR. Krabi: Khao Phanom Bencha National Park, 10 Jan. 2006, S. Gardner & P. Sidisuthorn ST2197 (BKF, K), 31 March 2005, S. Gardner & P. Tippayasri ST1801 (BKF, K). Satun: Thaleban National Park, 12 September 1990, C. Puff, A. Igersheim & V. Urchirakal 900912-2/10 (BKF, WU).
Distribution: —Peninsular Malaysia, Thailand (South-Western, Peninsular).
Ecology: —Tropical rain forest in shaded places at an elevation of 300‒ 500 m.
Notes: ― Lasianthus conspicuus was recorded for the first time in Thailand based on specimens deposited in BK (Zhu 2001). More recently we have found additional specimens of L. conspicuus at BKF.
description: Published as part of Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, pp. 1-38 in Phytotaxa 439 (1) on page 12, DOI: 10.11646/phytotaxa.439.1.1, http://zenodo.org/record/13873503
Problems of classifying associative or Lie algebras and triples of symmetric or skew-symmetric matrices are wild
Creators: name: Belitskii, Genrich
name: Lipyanski, Ruvim
name: Sergeichuk, Vladimir V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B30; 15A21; 16G60

description: We prove that the problems of classifying triples of symmetric or skew-symmetric matrices up to congruence, local commutative associative algebras with zero cube radical and square radical of dimension 3, and Lie algebras with central commutator subalgebra of dimension 3 are hopeless since each of them reduces to the problem of classifying pairs of n-by-n matrices up to simultaneous similarity.
description: 18 pages
Weak transition form factors of heavy-light pseudoscalar mesons for space- and timelike momentum transfers
Creators: name: Heger, Oliver
name: Gómez-Rocha, María
name: Schweiger, Wolfgang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Weak $B^-\rightarrow D^0, π^0$ and $D^-\rightarrow {K}^0, π^0$ transition form factors are described in both the space- and time-like momentum transfer regions, within a constituent-quark model. Neutrino-meson scattering and semileptonic weak decays are formulated within the point form of relativistic quantum mechanics to end up with relativistic invariant process amplitudes from which meson transition currents and form factors are extracted in an unambiguous way. For space-like momentum transfers, form factors depend on the frame in which the $W M M^\prime$ vertex is considered. Such a frame dependence is expected from a pure valence-quark picture, since a complete, frame independent description of form factors is supposed to include non-valence contributions. The most important of such contributions are the $Z$-graphs, which are, however, suppressed in the infinite-momentum frame ($q^2<0$). On the other hand, they can play a significant role in the Breit frame ($q^2<0$) and in the direct decay calculation ($q^2>0$), as a comparison with the infinite-momentum-frame form factors (analytically continued to $q^2>0$) reveals. Numerical results for the analytically continued infinite-momentum-frame form factors agree very well with lattice data in the time-like momentum transfer region and the experimental value for the slope of the $F^+_{B\rightarrow D}$ transition form factor at zero recoil is reproduced satisfactorily. These predictions satisfy heavy-quark-symmetry constraints and their $q^2$ dependence is well approximated by a pole fit, reminiscent of a vector-meson-dominance-like decay mechanism. We discuss how such a decay mechanism can be accommodated within an extension of our constituent-quark model, by allowing for a non-valence component in the meson wave functions. We also address the question of wrong cluster properties inherent in the Bakamjian-Thomas formulation.
description: 20 pages, 17 figures
A study of soil temperature and seedling survival in a forest clearcut
Creators: name: Stathers, Robert John
Publisher: name: University of British Columbia
Year: 2010

description: This thesis reports the results of a study of soil temperature and seedling survival on a steep south facing, high elevation forest clearcut on Vancouver Island, B.C., having a history of regeneration failures. During the first year of the study (1981) there were harsh weather conditions during the summer, while during the second year (1982) summer weather conditions were much milder. Lethally high surface soil temperatures were found to be the major cause of seedling mortality on this site. Of 2160 Douglas-fir, western hemlock and Pacific silver fir seedlings planted in April 1981, 87, 33 and 17% respectively had survived by the end of the second growing season. Shade cards significantly increased survival for each of these species. Of an additional 960 Douglas-fir, western hemlock, and Pacific silver fir seedlings planted in April 1982, 92, 74, and 88% respectively had survived by October 1982. Shade cards, trickle irrigation, and shade cards and trickle irrigation combined only significantly increased survival in western hemlock in the seedlings planted in 1982 because of the high overall survival rate resulting from the mild summer weather conditions. A physically based soil temperature model was developed to (i) quantify the effects of the factors which influence the soil thermal regime and (ii) to model the time course of soil profile temperatures from easily measured or estimated meteorological data and site specific characteristics. The model, based upon a finite difference solution of the heat flow equation, energy and radiation balance, and aerodynamic theory, calculates surface and subsurface temperatures in soils having thermal properties that vary with depth. A slightly modified version of the atmospheric stability correction method of Paulson (1970) was required to accurately predict surface temperatures under unstable atmospheric conditions. The model was tested with data presented in two other energy balance studies reported in the literature and found to estimate soil temperatures very accurately. In addition, good agreement was found between modelled and measured soil profile temperatures for 6 and 16 day periods in the forest clearcut mentioned above. Energy balance theory was used to show that maximum surface soil temperatures in a forest clearcut are not likely to exceed 85°C on a clear hot day. Wind speed, aerodynamic roughness of the surface, and soil thermal properties were also shown to strongly influence soil temperatures.
Compatibility of DAMA/LIBRA dark matter detection with other searches
Creators: name: Savage, Christopher
name: Gelmini, Graciela
name: Gondolo, Paolo
name: Freese, Katherine
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The DAMA/NaI and DAMA/LIBRA annual modulation data, which may be interpreted as a signal for the existence of weakly interacting dark matter (WIMPs) in our galactic halo, are examined in light of null results from other experiments. We use the energy spectrum of the combined DAMA modulation data given in 36 bins, and include the effect of channeling. Several statistical tools are implemented in our study: likelihood ratio with a global fit and with raster scans in the WIMP mass and goodness-of-fit (g.o.f.). These approaches allow us to differentiate between the preferred (global best fit) and allowed (g.o.f.) parameter regions. It is hard to find WIMP masses and couplings consistent with all existing data sets. For spin-independent (SI) interactions, the best fit DAMA regions are ruled out to the 3$σ$ C.L., even with channeling taken into account. However, for WIMP masses of ~8 GeV some parameters outside these regions still yield a moderately reasonable fit to the DAMA data and are compatible with all 90% C.L. upper limits from negative searches, when channeling is included. For spin-dependent (SD) interactions with proton-only couplings, a range of masses below 10 GeV is compatible with DAMA and other experiments, with and without channeling, when SuperK indirect detection constraints are included; without the SuperK constraints, masses as high as ~20 GeV are compatible. For SD neutron-only couplings we find no parameters compatible with all the experiments. Mixed SD couplings are examined: e.g. ~8 GeV mass WIMPs with a_n = +/- a_p are found to be consistent with all experiments. In short, there are surviving regions at low mass for both SI and SD interactions; if indirect detection limits are relaxed, some SD proton-only couplings at high masses also survive.
description: 45 pages, 23 figures. v2: Added references and minor revisions. v3: improvements to some null experiment analyses and DAMA g.o.f. statistical constraints; added DAMA total event rate constraint
Self-assembly of chelating, bridging N, N, N donor ligands and Cu(I), Cu(II), Cd(II), Hg(II): Molecular box versus coordination polymer
Creators: name: Dehghanpour, Saeed
name: Robabehsadat Tabatabaei
name: Simpson, Jim
name: Lipkowski, Janusz
Publisher: name: figshare
Year: 2021
Subjects: subject: Crystallography
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: 39904 Organometallic Chemistry

description: AbstractThree flexible chelating and bridging ligands, (E)-N-(pyridin-2-ylmethylene)-1-(pyridin-3-yl)methanamine(L1), 1-(pyridine-2-yl)-N-(pyridin-3-ylmethyl)methanamine (L01), (E)-N-(pyridin-2-ylmethylene)-1-(pyridin-4-yl)methanamine (L2), have been synthesized. The reaction of these ligands with various metal salts yielded a series of compounds, namely [Cu2(L1)(PPh3)2I2]2 (1), [Cu2(L2)(PPh3)2I2]n (2), [CuL1(-NO3)2]2 (3), [ZnL1(NO3)2]2 (4), [CdL1(NO3)2]2 [(5), [CdL01 (NO3)2]2 (6) and [HgL1Cl2]n (7). The compounds were characterized by elemental analysis, spectroscopic methods (IR, UV–Vis) and X-ray crystallography. X-ray structural analysis of compound 1 reveals the formation of a centrosymmetric tetranuclear compound. The repeat unit of coordination polymer 2 comprises a Cu2I2 unit with a triphenyl phosphane substituent on Cu1 linked to an adjacent Cu2I2 unit by the ligand L2 that acts as a bridge. Compounds 3, 4, 5 and 6 exhibit a common metallo-cyclophane [M2(L)2(NO3)4] skeleton. Two M2+ cations are linked by two L1 ligands and these ligands chelate to each metal atom through the imine nitrogen (or amine nitrogen) atoms and the nitrogen atom of the 2-pyridyl ring, and bind to the other metal atom of the pair via the nitrogen atoms of the 3-pyridyl rings. Structural studies of 7 revealed the formation of a coordination polymer in which the polymer chain propagates in helical spirals along a twofold screw axis parallel to b. The metal coordination geometries and coordination of the nitrato anions to the metals are noted and discussed.
An ultrametric version of the Maillet-Malgrange theorem for nonlinear q-difference equations
Creators: name: Di Vizio, Lucia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Number Theory (math.NT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 33E99, 39A13

description: We prove an ultrametric q-difference version of the Maillet-Malgrange theorem, on the Gevrey nature of formal solutions of nonlinear analytic q-difference equations. Since °_q and \ord_q define two valuations on {\mathbb C}(q), we obtain, in particular, a result on the growth of the degree in q and the order at q of formal solutions of nonlinear q-difference equations, when q is a parameter. We illustrate the main theorem by considering two examples: a q-deformation of ``Painleve' II'', for the nonlinear situation, and a q-difference equation satisfied by the colored Jones polynomials of the figure 8 knots, in the linear case. We consider also a q-analog of the Maillet-Malgrange theorem, both in the complex and in the ultrametric setting, under the assumption that |q|=1 and a classical diophantine condition.
description: 11 pages; many language inaccuracies have been corrected
Lasianthus flavihirtus Zhu 2002
Creators: name: Napiroon, Tiwtawat
name: Chayamarit, Kongkanda
name: Dawson, Sally
name: Till, Walter
name: Balslev, Henrik
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Gentianales
Rubiaceae
Lasianthus
Lasianthus flavihirtus

description: 18. Lasianthus flavihirtus Zhu (2002:575). Type: ― THAILAND. Phangnga, Khao Phorta Luang Keaw, 2 May 1973, R. Geesink & T. Santisuk 5141 (holotype L n.v.; isotype AAU!).
T hailand: ―Known only from the type collection.
Distribution: ―Endemic to Thailand (Peninsular).
Ecology: ―Moist evergreen forest at an elevation of 1100‒1300 m. Flowering and fruiting in April‒May.
Notes: ― Lasianthus flavihirtus is similar to L. formosensis Mutsumura (1901:17) but differs by having: flavi-hirsute branches, branchlets, midrib and abaxial leaf surface (not pubescent); calyx campanulate with hirsute, 2 mm long hairs (not calyx campanulate, villous, 3‒4 mm long hairs); fresh fruits orange (not blue); drupes globose, hirsute (not ovoid to globose, subglabrous).
description: Published as part of Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, pp. 1-38 in Phytotaxa 439 (1) on page 15, DOI: 10.11646/phytotaxa.439.1.1, http://zenodo.org/record/13873503
SMAC3: A Versatile Bayesian Optimization Package for Hyperparameter Optimization
Creators: name: Lindauer, Marius
name: Eggensperger, Katharina
name: Feurer, Matthias
name: Biedenkapp, André
name: Deng, Difan
name: Benjamins, Carolin
name: Ruhopf, Tim
name: Sass, René
name: Hutter, Frank
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Algorithm parameters, in particular hyperparameters of machine learning algorithms, can substantially impact their performance. To support users in determining well-performing hyperparameter configurations for their algorithms, datasets and applications at hand, SMAC3 offers a robust and flexible framework for Bayesian Optimization, which can improve performance within a few evaluations. It offers several facades and pre-sets for typical use cases, such as optimizing hyperparameters, solving low dimensional continuous (artificial) global optimization problems and configuring algorithms to perform well across multiple problem instances. The SMAC3 package is available under a permissive BSD-license at https://github.com/automl/SMAC3.
Quark spin-orbit correlations in the pion meson in light-cone quark model
Creators: name: Tan, Chentao
name: Lu, Zhun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the correlation between the quark spin and orbital angular momentum inside the pion meson. Similar to the case inside the nucleon, the longitudinal spin-orbit correlation $C_z^{q/π}$ in pion meson can be expressed in terms of the corresponding generalized parton distributions (GPDs) and generalized transverse momentum distributions (GTMDs). This provides new information about the spin structure of the pion. Using the wavefunctions of the pion in the light-cone quark model and the overlap representation for GPDs and GTMDs, we present the analytical results for the quark longitudinal spin-orbit correlation. We find that the GPD approach and the GTMD approach lead to the same results. The numerical results is also obtained, showing that the correlation in pion is anti-aligned. In addition, we compare $C_z^{q/π}$ from the GPD approach and the GTMD approach, with $x$ and the transverse momentum $k_T$ unintegrated.
description: 9 pages, two figures, version accepted by PRD