cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Temporal regularities in child-directed speech (Pérez-Navarro et al., 2022)
Creators: name: Pérez-Navarro, Jose
name: Lallier, Marie
name: Clark, Catherine
name: Flanagan, Sheila
name: Goswami, Usha
Publisher: name: ASHA journals
Year: 2022
Subjects: Speech pathology
Speech production

description: Purpose: The purpose of this study is to characterize the local (utterance-level) temporal regularities of child-directed speech (CDS) that might facilitate phonological development in Spanish, classically termed a syllable-timed language. Method: Eighteen female adults addressed their 4-year-old children versus other adults spontaneously and also read aloud (CDS vs. adult-directed speech [ADS]). We compared CDS and ADS speech productions using a spectrotemporal model (Leong & Goswami, 2015), obtaining three temporal metrics: (a) distribution of modulation energy, (b) temporal regularity of stressed syllables, and (c) syllable rate. Results: CDS was characterized by (a) significantly greater modulation energy in the lower frequencies (0.5–4 Hz), (b) more regular rhythmic occurrence of stressed syllables, and (c) a slower syllable rate than ADS, across both spontaneous and read conditions. Discussion: CDS is characterized by a robust local temporal organization (i.e., within utterances) with amplitude modulation bands aligning with delta and theta electrophysiological frequency bands, respectively, showing greater phase synchronization than in ADS, facilitating parsing of stress units and syllables. These temporal regularities, together with the slower rate of production of CDS, might support the automatic extraction of phonological units in speech and hence support the phonological development of children. Supplemental Material S1. Formula of cross-frequency phase synchronization index (PSI). Supplemental Material S2. Delta-theta PSI values across different n:m ratios. The point within each distribution represents the mean, and the bars represent standard deviations. Supplemental Material S3. Pearson correlation between manual and automatic syllable rate computation. Correlation index at the top left corner. Supplemental Material S4. Delta-theta PSI across speaking conditions and spectral bands. Error bars represent standard error of the mean. Pie plot in the bottom right corner represents the percentage of Tukey HSD contrasts for which PSI is higher for CDS (orange), ADS (blue), or resulted in a non-significant difference (gray, adjusted p-threshold = .05). Pérez-Navarro, J., Lallier, M., Clark, C., Flanagan, S., & Goswami, U. (2022). Local temporal regularities in child-directed speech in Spanish. Journal of Speech, Language, and Hearing Research. Advance online publication. https://doi.org/10.1044/2022_JSLHR-22-00111
PDF version the Atlas of Bacterial and Archaeal Cell Structure
Creators: name: Oikonomou, Catherine
name: Jensen, Grant
Publisher: name: CaltechDATA
Year: 2021
Subjects: Atlas of Bacterial and Archaeal Cell Structure
CryoEM
Jensen Lab

description: PDF format of version 2.1 of "The Atlas of Bacterial & Archaeal Cell Structure" by Catherine M. Oikonomou & Grant J. Jensen
An aspherical distribution for the explosive burning ash of core-collapse supernovae
Creators: name: Fang, Qiliang
name: Maeda, Keiichi
name: Kuncarayakti, Hanindyo
name: Nagao, Takashi
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: It is widely believed that asphericity in the explosion is the crucial ingredient leading to successful core-collapse (CC) supernovae. However, direct observational evidence for the explosion geometry and for the connection with the progenitor properties are still missing. Based on the thus-far largest late-phase spectroscopic sample of stripped-envelope CC supernovae, we demonstrate that about half of the explosions exhibit a substantial deviation from sphericity. For these aspherical CC supernovae, the spatial distributions of the oxygen-burning ash and the unburnt oxygen, as traced by the profiles of [Ca II] λλ7291,7323 and [O i] λλ6300,6363 emissions, respectively, appear to be anticorrelated, which can be explained if the explosion is bipolar and the oxygen-rich material burnt into two detached iron-rich bubbles. Our combined analysis of the explosion geometry and the progenitor mass further suggests that the degree of asphericity grows with the mass of the carbon-oxygen core, which may be used to guide state-of-the-art simulations of CC supernova explosions.
description: Author version of paper published in Nature Astronomy on Oct 26th 2023; DOI:10.1038/s41550-023-02120-8
I SIMPÓSIO INTERNACIONAL SOBRE INOVAÇÃO E EMPREENDEDORISMO ORIENTADO A SUSTENTABILIDADE, ISPCAÁLA, 2018.
Creators: name: Chipindo, Helder
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390403
subject: Educational administration, management and leadership
classificationCode: 390409
subject: Learning sciences

description: O Simpósio Internacional é um evento científico bianual promovido pelo ISPCAÁLA – Instituto Superior Politécnico da Caála, na cidade da Caála, província do Huambo, em Angola. No anexo estão disponíveis os resumos dos trabalhos científicos submetidos pelos vários pesquisadores participantes ao I Simpósio Internacional sobre Empreendedorismo Orientado a Sustentabilidade, que teve lugar em 2018.
Turbulent magnetic energy spectrum and the cancellation function of solar photospheric magnetic fields
Creators: name: Marschalkó, G.
name: Petrovay, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A simple analytical relation of form α = 2 κ -1 between the magnetic energy spectral exponent α of the turbulent magnetic field in the solar photosphere and its magnetic flux cancellation exponent κ, valid under certain restrictive assumptions, is tested and extended outside its range of validity in a series of Monte Carlo simulations. In these numerical tests artificial "magnetograms" are constructed in 1D and 2D by superposing a discrete set of Fourier modes of the magnetic field distribution with amplitudes following a power law spectrum and measuring the cancellation function on these simulated magnetograms. Our results confirm the validity of the analytical relation and extend it to the domain α < -1 where κ ---> 0 as α ---> - infinity. The observationally derived upper limit of 0.38 on κ implies α < -0.24 in the granular size range, apparently at odds with a small scale dynamo driven in the inertial range.
description: 4 pages, 4 figures
Proportionality of components, Liouville theorems and a priori estimates for noncooperative elliptic systems
Creators: name: Montaru, Alexandre
name: Sirakov, Boyan
name: Souplet, Philippe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J47, 35J61, 35J57, 35B45, 35B53, 35B06

description: We study qualitative properties of positive solutions of noncooperative, possibly nonvariational, elliptic systems. We obtain new classification and Liouville type theorems in the whole Euclidean space, as well as in half-spaces, and deduce a priori estimates and existence of positive solutions for related Dirichlet problems. We significantly improve the known results for a large class of systems involving a balance between repulsive and attractive terms. This class contains systems arising in biological models of Lotka-Volterra type, in physical models of Bose-Einstein condensates and in models of chemical reactions.
description: 35 pages, to appear in Archive Rational Mech. Anal
Telenomus tetratomus
Creators: name: Awad, Jessica
name: Zimmermann, Dominique
name: Talamas, Elijah
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Scelionidae
Telenomus
Telenomus tetratomus

description: Telenomus tetratomus (Thomson, 1860)
Phanurus tetratomus Thomson, 1860: 174. Type locality: Sweden, Ringsjön.
Telenomus bombycis Mayr, 1879: 701–702, 711. Type locality: Austria, Vienna.
Telenomus gracilis Mayr, 1879: 701, 713. Type locality: Germany?
Telenomus verticillatus Kieffer, 1917: 342–343. Type locality: Denmark.
Phanurus gracilis – Brues 1908: 5.
Telenomus tetratomus – Kieffer 1912: 28. — Kozlov 1967: 362, 370, 374 (lectotype designation). Prophanurus gracilis – Kieffer 1912: 49, 57.
Prophanurus bombycis – Kieffer 1912: 55, 60.
Telenomus bombycis – Kozlov 1967: 362 (lectotype designation).
Telenomus gracilis – Kozlov 1967: 362 (lectotype designation).
Telenomus verticillatus – Kozlov 1967: 362. — Szabó 1978: 220, 223 (lectotype designation). Asolcus bombycis – Szabó 1976: 177, 186.
Material examined
Lectotype of Telenomus bombycis Mayr [AUSTRIA] • 1 ♀; NHMW-HYM#0005384.
Paralectotype of Telenomus bombycis Mayr [AUSTRIA] • 1 ♀; NHMW-HYM#0006885.
Lectotype of Telenomus gracilis Mayr
[GERMANY] • 1 ♂; O. Hofmann leg.; [Macrothylacia rubi eggs]; NHMW-HYM#0005403.
Paralectotypes of Telenomus gracilis Mayr
[AUSTRIA] • 4 specimens; Wachtl leg.; [Macrothylacia rubi eggs]; NHMW.
Remarks
The male lectotype of T. bombycis designated by Szabó (1976) is invalid, having been published after Kozlov (1967). Numerous additional specimens of T. gracilis (mounted on 13 separate corks) are labeled “G. Mayr, Type”.
description: Published as part of Awad, Jessica, Zimmermann, Dominique & Talamas, Elijah, 2024, A photographic type catalogue of Platygastroidea (Insecta, Hymenoptera) in the Natural History Museum Vienna, pp. 1-58 in European Journal of Taxonomy 938 on page 37, DOI: 10.5852/ejt.2024.938.2565, http://zenodo.org/record/12106502
Deformation propagation in responsive polymer network films
Creators: name: Ghosh, Surya K
name: Cherstvy, Andrey G
name: Metzler, Ralf
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We study the elastic deformations in a cross-linked polymer network film triggered by the binding of submicron particles with a sticky surface, mimicking the interactions of viral pathogens with thin films of stimulus-responsive polymeric materials such as hydrogels. From extensive Langevin Dynamics simulations we quantify how far the network deformations propagate depending on the elasticity parameters of the network and the adhesion strength of the particles. We examine the dynamics of the collective area shrinkage of the network and obtain some simple relations for the associated characteristic decay lengths. A detailed analysis elucidates how the elastic energy of the network is distributed between stretching and compression modes in response to the particle binding. We also examine the force-distance curves of the repulsion or attraction interactions for a pair of sticky particles in the polymer network film as a function of the particle-particle separation. The results of this computational study provide new insight into collective phenomena in soft polymer network films and may, in particular, be applied to applications for visual detection of pathogens such as viruses via a macroscopic response of thin films of cross-linked hydrogels.
description: 10 pages, 10 figures, RevTeX
Quantum Monte Carlo calculations of neutron matter with non-local chiral interactions
Creators: name: Roggero, Alessandro
name: Mukherjee, Abhishek
name: Pederiva, Francesco
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present fully non-perturbative quantum Monte Carlo calculations with non-local chiral effective field theory (EFT) interactions for the ground state properties of neutron matter. The equation of state, the nucleon chemical potentials and the momentum distribution in pure neutron matter up to one and a half times the nuclear saturation density are computed with a newly optimized chiral EFT interaction at next-to-next-to-leading order. This work opens the way to systematic order by order benchmarking of chiral EFT interactions, and \emph{ab initio} prediction of nuclear properties while respecting the symmetries of quantum chromodynamics.
description: 5 pages, 4 figures, 1 table
Quantum Deformation of the Effective Theory on Non-Abelian string and 2D-4D correspondence
Creators: name: Shifman, M.
name: Yung, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore non-Abelian strings in the r=N-1 vacuum of N=2 supersymmetric QCD with the gauge group U(N) and N_f flavors of quarks (N_f\geq N), where r is the number of condensed quarks. N=2 supersymmetry is broken down to N=1 by a small mass term for the adjoint matter. We discover that the low-energy two-dimensional theory on the string world-sheet receives nonperturbative corrections from the bulk, through the bulk gaugino condensate. This is in contradistinction with the r=N vacuum situation, in which nonperturbative effects on the world sheet are determined by internal dynamics of the world-sheet theory. The 2D-4D correspondence (the coincidence of spectra of two-dimensional kinks and four-dimensional monopoles) remains valid in the BPS sector. Nonperturbative bulk effects deforming the weighted CP model on the world sheet are found by virtue of the method of resolvents suggested by Gaiotto, Gukov and Seiberg for surface defects. In the r=N vacuum the gaugino condensate in the bulk vanishes, and there are no "outside" nonperturbative corrections on the world sheet.
description: 35 pages, 3 figures
АДАПТИВНЫЙ ПОТЕНЦИАЛ СОРТОВ ПШЕНИЦЫ (ОЗИМОЙ, ЯРОВОЙ МЯГКОЙ И ЯРОВОЙ ТВЕРДОЙ) СЕЛЕКЦИИ ОМСКОГО АГРАРНОГО НАУЧНОГО ЦЕНТРА
Creators: name: РОССЕЕВА Л. П.
name: КОВТУНЕНКО А. Н.
name: ЮСОВ В. С.
name: ЕВДОКИМОВ М. Г.
name: БЕЛАН И. А.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ТВЕРДАЯ ПШЕНИЦА (TRITICUM DURUM DESF.)
ОЗИМАЯ МЯГКАЯ ПШЕНИЦА (TRITICUMAESTIVUM L.)
ЯРОВАЯ МЯГКАЯ ПШЕНИЦА (TRITICUM AESTIVUM L.)
СОРТ
УРОЖАЙНОСТЬ
КАЧЕСТВО ЗЕРНА
ПЛАСТИЧНОСТЬ
СТАБИЛЬНОСТЬ
DURUM WHEAT (TRITICUM DURUM DESF.)
WINTER WHEAT (TRITICUM AESTIVUM L.)
COMMON WHEAT (TRITICUM AESTIVUM L.)
VARIETY
YIELD
GRAIN QUALITY
PLASTICITY
STABILITY

description: Цель исследования - оценка адаптивности сортов пшеницы (озимой и яровой мягкой, яровой твердой) в южной лесостепи Омской области для выбора лучших генотипов. В конкурсном сортоиспытании в 2015-2019 гг. испытывали 10 сортов твердой, 11 сортов озимой, 31 сорт яровой мягкой пшеницы. Срок посева яровой мягкой и твердой - 14.16 мая, озимой мягкой пшеницы - 3 декада августа, норма - 4,5 и 5,0 млн всхожих семян/га соответственно. Предшественник - чистый пар, для озимых - кулисный с посевом горчицы. Средняя за годы исследования урожайность твердой пшеницы составила 4,08 т/ га, озимой мягкой - 4,47 т/га, яровой мягкой - 2,77 т/га. По сбору зерна выделились сорта твердой пшеницы Омский изумруд, Омский коралл (4,63.4,68 т/га), озимой мягкой - Прииртышская 2 (5,01 т/га), яровой мягкой - Боевчанка, Казанская юбилейная, Омская 38, Уралосибирская 2, Омская 35 (3,17.3,56 т/га). Хорошо отзывались на улучшение условий возделывания и формировали стабильную продуктивность Омский изумруд, линия 24/16, Боевчанка, Казанская юбилейная, Омская 35, Уралосибирская, Уралосибирская 2. Высокую натуру зерна отмечали у сортов твердой пшеницы Омская степная, Омский изумруд, гордеиформе 09-68-1 (793.796 г/л); озимой мягкой - Прииртышская, линий 24/16, 25/16 (785.790 г/л); яровой мягкой - Катюша, Сигма, Омская 30 (702.730 г/л). Высокую пластичность и стабильность по натуре зерна сочетали Омский корунд, Омский циркон, Омская бирюза, линия 43/16, Омская 12, Омская 19. Высокое содержание белка (14,66.16,51 %) и клейковины (28,4.33,9 %) в зерне формировали Омская янтарная, Омская степная, Прииртышская, линия 24/16, Боевчанка, Омская 38, Сигма, Уралосибирская 2, Омская 42. По стабильности признаков качества зерна выделились Омский корунд, Жемчужина Сибири, Омская степная, Омский изумруд, Прииртышская, линии 24/16, 26/16, Омская 12, Омская 32, Омская 19, Омская 33, Казанская юбилейная, Уралосибирская, Мелодия, Омская 42.
From ›backstage scribbling‹ to ›talking fieldnotes‹. Method(olog)ische Reflexionen im Nachgang an eine ethnographische Erhebung
Creators: name: Schitow, Katharina
name: Natarajan, Radhika
name: Grünheid, Irina
Publisher: name: Universität Bielefeld
Year: 2023
Subjects: subject: 300
subject: Talking fieldnotes
subject: Methodology
subject: participatory observation
subject: Methodologie
subject: Teilnehmende Beobachtung
subject: Methode der Protokollierung
subject: Reflexion ethnographischer Beobachtungen

description: The working paper From ›backstage scribbling‹ to ›talking fieldnotes‹ deals with method(olog)ical reflections on the academic support and accompaniment of a travelling exhibition. It presents the concept of »talking fieldnotes« (Cloos 2010) as a method of data collection and analysis. The methodological reflection on the use of ›talking fieldnotes‹ unfolds in a conversation between research associates in a research workshop setting. In this paper, the authors share their first experiences with this method and discuss them in terms of their relevance to the subject matter and practicability. The paper provides a behind-the-scenes look at ethnographic data collection and highlights initial insights and challenges with the ›talking fieldnotes‹ method. Besides, it also grapples with the medium of exchange – online or in co-presence – as a structuring device for the exchange of ideas.
description: Das Arbeitspapier From ›backstage scribbling‹ to ›talking fieldnotes‹ befasst sich mit method(olog)ischen Reflexionen der wissenschaftlichen Begleitung einer Wanderausstellung. Es stellt das Konzept der »talking fieldnotes« (Cloos 2010) als eine Methode der Datenerhebung und -analyse vor. Die methodologische Reflexion des Einsatzes der ›talking field-notes‹ findet in einem Gespräch zwischen den Mitarbeiterinnen im Setting einer projektinternen Forschungswerkstatt statt. Mit diesem Paper teilen die Autorinnen ihre ersten Erfahrungen mit dieser Methode und diskutieren diese im Hinblick auf ihre Gegenstandsangemessenheit und Praktikabilität. Das Arbeitspapier erlaubt einen Blick hinter die Kulissen der ethnographischen Erhebung und weist auf erste Erkenntnisse und Herausforderungen mit der Methode der ›talking fieldnotes‹ hin. Zudem werden erste Überlegungen zum Medium des Austausches in leiblicher Ko-Präsenz oder in der Zweidimensionalität online als strukturierende Größe angestellt.
Depolarized light scattering and dielectric response of a peptide dissolved in water
Creators: name: Martin, Daniel R.
name: Fioretto, Daniele
name: Matyushov, Dmitry V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The density and orientational relaxation of bulk water can be separately studied by depolarized light scattering (DLS) and dielectric spectroscopy (DS), respectively. Here we ask the question of what are the leading collective modes responsible for polarization anisotropy relaxation (DLS) and dipole moment relaxation (DS) of solutions involving mostly hydrophobic solute-water interfaces. We study, by atomistic molecular dynamics simulations, the dynamics and structure of hydration water interfacing N-Acetyl-leucine-methylamide (NALMA) dipeptide. The DLS response of the solution is consistent with three relaxation processes: bulk water, rotations of single solutes, and collective dipole-induced-dipole polarizability of the solutes, with the time-scale of 130-200 ps. No separate DLS response of the hydration shell has been identified by our simulations. Density fluctuations of the hydration layer, which largely contribute to the response, do not produce a dynamical process distinct from bulk water. We find that the structural perturbation of the orientational distribution of hydration waters by the dipeptide solute is quite significant and propagates 3-5 hydration layers into the bulk. This perturbation is still below that produced by hydrated globular proteins. Despite this structural perturbation, there is little change in the orientational dynamics of the hydration layers, compared to the bulk, as probed by both single-particle orientational dynamics and collective dynamics of the dipole moment of the shells. There is a clear distinction between the perturbation of the interfacial structure by the solute-solvent interaction potential and the perturbation of the interfacial dynamics by the corresponding forces.
СОВРЕМЕННЫЕ СОРТА ЯРОВОЙ МЯГКОЙ ПШЕНИЦЫ ДЛЯ ЛЕСОСТЕПНОЙ ЗОНЫ СРЕДНЕВОЛЖСКОГО РЕГИОНА
Creators: name: ЧЕКМАСОВА К. Ю.
name: МУЛЛАЯНОВА О. С.
name: ТАРАНОВА Т. Ю.
name: КИНЧАРОВ А. И.
name: ДЁМИНА Е. А.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ЯРОВАЯ МЯГКАЯ ПШЕНИЦА (TRITICUMAESTIVUM L.)
СЕЛЕКЦИЯ
СОРТ
КОНКУРСНОЕ ИСПЫТАНИЕ
УРОЖАЙНОСТЬ
КАЧЕСТВО ЗЕРНА
АДАПТИВНОСТЬ
УСТОЙЧИВОСТЬ
SPRING COMMON WHEAT (TRITICUMAESTIVUM L.)
BREEDING
VARIETY
COMPETITIVE TESTING
PRODUCTIVITY
GRAIN QUALITY
ADAPTABILITY
RESISTANCE

description: Исследования проводили с целью создания новых селекционных сортов яровой мягкой пшеницы, отличающихся стабильно высокой урожайностью и качеством зерна, с высокой адаптивностью и устойчивостью к стрессовым факторам региона. Работу выполняли в лесостепной зоне Самарской области в 2016-2019 гг. Объект исследований - 36 образцов конкурсного испытания, различающихся по потенциалу продуктивности и качества зерна, стандарт - районированный в регионе сорт Кинельская нива. Селекционная схема создания новых сортов традиционная (классическая). Изучение и оценку сортов проводили согласно Методике государственного сортоиспытания сельскохозяйственных культур. Метеорологические условия вегетационных сезонов отличались контрастностью, что типично для зоны проведения исследований: в 2016 г. гидротермический коэффициент был равен 0,38, в 2017 г. - 1,04, в 2018 г. - 0,51, в 2019 г. - 0,48 (среднемноголетнее значение показателя 0,73). Средняя урожайность сортов конкурсного испытания варьировала от 2,00 т/га (2019 г.) до 3,41 т/га (2017 г.) с коэффициентом вариации по годам Cv=26,2 %. Интерес для селекционной работы представляют сорта, сочетающие высокий уровень урожайности и меньший коэф фициент вариации этого признака: Эритроспермум 6310/10-63 (Cv=21,0 %), Эритроспермум 6381 (Cv=24,4 %), Эритроспермум 6517/24-1 (Cv=24,9 %). Адаптивность новых сортов высокая, в среднем 102,8.116,8 %. Выделен ы перспективные сорта с высокой и стаб ильной продуктивностью (прибавка урожая зерна к стандарту 0,12.0,47 т/ га, или 4,7.18,6 %), качеством зерна соответствующим требованиям сильных и ценных пшениц, с высокой комплексной устойчивостью к листовым грибным заболеваниям. Общая хлебопекарная оценка сортов достаточно высокая, в среднем 3,9...4,4 балла. Перспективные сорта яровой мягкой пшеницы с селекционными номерами - Эритроспермум 4144, Лютесценс 6029, Лютесценс 6102/1-32, Эритроспермум 6310/10-63, Эритроспермум 6381, Эритроспермум 6517/24-1 планируются для передачи на Государственное испытание по Средневолжскому региону, начато их первичное семеноводство.
On the boundary behaviour of left-invariant Hitchin and hypo flows
Creators: name: Belgun, Florin
name: Cortés, Vicente
name: Freibert, Marco
name: Goertsches, Oliver
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C10, 53C44, 53C29

description: We investigate left-invariant Hitchin and hypo flows on $5$-, $6$- and $7$-dimensional Lie groups. They provide Riemannian cohomogeneity-one manifolds of one dimension higher with holonomy contained in $SU(3)$, $G_2$ and $Spin(7)$, respectively, which are in general geodesically incomplete. Generalizing results of Conti, we prove that for large classes of solvable Lie groups $G$ these manifolds cannot be completed: a complete Riemannian manifold with parallel $SU(3)$-, $G_2$- or $Spin(7)$-structure which is of cohomogeneity one with respect to $G$ is flat, and has no singular orbits. We furthermore classify, on the non-compact Lie group $SL(2,C)$, all half-flat $SU(3)$-structures which are bi-invariant with respect to the maximal compact subgroup $SU(2)$ and solve the Hitchin flow for these initial values. It turns out that often the flow collapses to a smooth manifold in one direction. In this way we recover an incomplete cohomogeneity-one Riemannian metric with holonomy equal to $G_2$ on the twisted product $SL(2,C)\times_{SU(2)} C^2$ described by Bryant and Salamon.
description: 21 pages
Telenomus turesis Walker 1836
Creators: name: Awad, Jessica
name: Zimmermann, Dominique
name: Talamas, Elijah
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Scelionidae
Telenomus
Telenomus turesis

description: Telenomus turesis Walker, 1836
Telenomus turesis Walker, 1836: 353. Type locality: England.
Phanurus chloropus Thomson, 1860: 173. Type locality: Sweden, Glimakra.
Telenomus sokolowi Mayr, 1897: 442–443. Type locality: Ukraine, Kharkiv.
Telenomus mayri Sokolov, 1904: 29. Type locality: Palearctic.
Telenomus tischleri Nixon, 1939: 129. Type locality: Poland, Mrągowo.
Aphanurus turesis – Kieffer 1912: 75.
Microphanurus turesis – Kieffer 1926: 91, 98.
Telenomus chloropus – Kieffer 1926: 25, 29.
Telenomus sokolovi – Meier 1940: 79–80 (unjustified emendation). — Kozlov 1967: 360 (lectotype designation).
Telenomus mayri – Kozlov 1963: 295 (junior synonym of Phanurus chloropus Thomson, 1860).
Telenomus tischleri – Kozlov 1967: 360.
Trissolcus turesis – Fergusson 1978: 120.
Telenomus turesis – Fergusson 1984: 232 (lectotype designation).
Phanurus chloropus – Mineo et al. 2010: 116.
Material examined
Lectotype of Telenomus sokolowi Mayr UKRAINE • 1 ♀; Kharkhiv; [N. Sokolov leg.]; [Eurygaster maura eggs]; NHMW-HYM#0005394.
Paralectotypes of Telenomus sokolowi Mayr UKRAINE • 3 ♂♂; same data as for lectotype; NHMW.
description: Published as part of Awad, Jessica, Zimmermann, Dominique & Talamas, Elijah, 2024, A photographic type catalogue of Platygastroidea (Insecta, Hymenoptera) in the Natural History Museum Vienna, pp. 1-58 in European Journal of Taxonomy 938 on page 38, DOI: 10.5852/ejt.2024.938.2565, http://zenodo.org/record/12106502
СОРТ ОЗИМОЙ ПШЕНИЦЫ ВЬЮГА
Creators: name: СУХОРУКОВ А. Ф.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ОЗИМАЯ ПШЕНИЦА (TRITICUM AESTIVUM L.)
СОРТ
КАЧЕСТВО ЗЕРНА
УРОЖАЙНОСТЬ
СТРУКТУРА УРОЖАЯ
БУРАЯ РЖАВЧИНА (PUCINIA RECONDITA ROB.EXDESM.F.SP.TRITICI)
МУЧНИСТАЯ РОСА (BLUMERIA GRAMINIS)
ПИРЕНОФОРОЗ
КОРРЕЛЯЦИЯ
WINTER WHEAT (TRITICUM AESTIVUM L.)
VARIETY
GRAIN QUALITY
YIELD
CROP STRUCTURE
BROWN RUST (PUCCINIA RECONDITA ROB.EX DESM.F.SP.TRITICI)
POWDERY MILDEW (BLUMERIA GRAMINIS)
PYRENOPHOROSIS
CORRELATION

description: Цель исследования - оценить хозяйственно-биологические признаки короткостебельного сорта пшеницы мягкой озимой Вьюга в варьирующих условиях внешней среды. Короткостебельный сорт Вьюга (высота растений 78 см) сравнивали с высокорослым Безенчукская 380 и среднерослым Бирюза. Исследования проводили в 2016-2019 гг. в Самарской области по методике Госкомиссии по сортоиспытанию. Сорт Вьюга среднеспелый (продолжительность вегетационного периода 320 дней, на 3 дня короче, чем у Безенчукской 380), зимостойкий (100 %), с потенциальной урожайностью в Среднем Поволжье 8,25 т/га. В среднем за годы исследования сбор зерна (5,64 т/га) у испытуемого сорта был на 1,04 и 0,77 т/га выше, чем у Безенчукской 380 и Бирюзы соответственно. В условиях засухи периода колошение-созревание в 2018 г. сорта Вьюга превысил по величине этого показателя Безенчукскую 380 и Бирюзу на 1,07 и 1,16 т/га соответственно. Вьюга в благоприятных условиях 2017 г. формировала урожайность в результате повышенной густоты стеблестоя (635 шт./м2, или на 225 шт./м2 выше, чем у Безенчукской 380). В условиях засухи 2018 г продуктивность формировалась благодаря повышенному количеству зерен в колосе (51 шт.), которая была на 12 шт. больше, чем у Безенчукской 380. Масса 1000 зерен варьировала в пределах 29,0.42,2 г. Сорт Вьюга включен в список ценных по качеству зерна: число падения - 327 с, массовая доля белка - 15,3 %, массовая доля клейковины - 32,5 %, валориметрическая оценка - 77 ед., объем хлеба - 835 мл, общая оценка хлеба - 4,6 балла. Сорт устойчив к поражению бурой ржавчиной Puccinia recondita (тип реакции на поражение 0, степень поражения 0 %), обладает средней чувствительностью к пирепофорозу (степень поражения 20 %), слабовосприимчив к мучнистой росе (степень поражения 5 %).
Measurement of the forward-backward asymmetry in the distribution of leptons in $t\bar{t}$ events in the lepton+jets channel
Creators: name: D0 Collaboration
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present measurements of the forward-backward asymmetry in the angular distribution of leptons from decays of top quarks and antiquarks produced in proton-antiproton collisions. We consider the final state containing a lepton and at least three jets. The entire sample of data collected by the D0 experiment during Run II of the Fermilab Tevatron Collider, corresponding to 9.7 inverse fb of integrated luminosity, is used. The asymmetry measured for reconstructed leptons is $A_{FB}^l = \big(2.9 \pm 2.1(stat.) ^{+1.5}_{-1.7}(syst.) \big)$%. When corrected for efficiency and resolution effects within the lepton rapidity coverage of $|y_l|<1.5$, the asymmetry is found to be $A_{FB}^l = \big(4.2 \pm 2.3(stat.) ^{+1.7}_{-2.0}(syst.) \big)$%. Combination with the asymmetry measured in the dilepton final state yields $A_{FB}^l = \big(4.2 \pm 2.0(stat.) \pm 1.4(syst.) \big)$%. We examine the dependence of $A_{FB}^l$ on the transverse momentum and rapidity of the lepton. The results are in agreement with predictions from the next-to-leading-order QCD generator \mcatnlo, which predicts an asymmetry of $A_{FB}^l = 2.0$% for $|y_l|<1.5$.
description: submitted to Phys. Rev. D
Telenomus wullschlegeli Mayr 1879
Creators: name: Awad, Jessica
name: Zimmermann, Dominique
name: Talamas, Elijah
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Scelionidae
Telenomus
Telenomus wullschlegeli

description: Telenomus wullschlegeli Mayr, 1879
Telenomus wullschlegeli Mayr, 1879: 701–702, 711. Type locality: Austria, Vienna.
Prophanurus wullschlegeli – Kieffer 1912: 54, 60.
Telenomus wullschlegeli – Kozlov 1967: 362, 370, 374 (lectotype designation); 1978: 642, 644. Asolcus wullschlegeli – Szabó 1976: 177, 185.
Material examined
Lectotype [AUSTRIA] • 1 ♀; [Jun. 1875]; [Vienna]; [G. Mayr leg.]; [Eriogaster lanestris eggs]; NHMW-HYM#0005398.
Paralectotypes [AUSTRIA] • 1 ♂; NHMW-HYM#0005399 • 3 specimens; NHMW • 1 ♀, 1 ♂; NHMW.
Remarks
Mayr (1879) remarked that the zoologische Hofcabinete included specimens of T. wullschlegeli reared from Malacosoma castrensis eggs, and that the males differed from his reared specimens in color and the proportions of the antennomeres. Numerous additional specimens of T. wullschlegeli (mounted on 8 separate corks) are labeled “G. Mayr, Type ”. The collection also includes moldy host material, probably from the old Hofcabinete.
description: Published as part of Awad, Jessica, Zimmermann, Dominique & Talamas, Elijah, 2024, A photographic type catalogue of Platygastroidea (Insecta, Hymenoptera) in the Natural History Museum Vienna, pp. 1-58 in European Journal of Taxonomy 938 on page 39, DOI: 10.5852/ejt.2024.938.2565, http://zenodo.org/record/12106502
ПРОДУКТИВНОСТЬ И АДАПТИВНОСТЬ СОРТОВ ОЗИМОЙ РЖИ НА СРЕДНЕМ УРАЛЕ
Creators: name: ЗОБНИНА Н. Л.
name: ГАЛИМОВ К. А.
name: ПОТАПОВА Г. Н.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ОЗИМАЯ РОЖЬ (SECALE SEREALE L.)
СОРТ
КОНКУРСНОЕ ИСПЫТАНИЕ
КОРРЕЛЯЦИЯ
УРОЖАЙНОСТЬ
АДАПТИВНОСТЬ
ЗИМОСТОЙКОСТЬ
ПРОДУКТИВНЫЙ СТЕБЛЕСТОЙ
МАССА 1000 ЗЕРЕН
ПРОДУКТИВНОСТЬ КОЛОСА
WINTER RYE (SECALE SEREALE L.)
VARIETY
COMPETITIVE TESTING
CORRELATION
PRODUCTIVITY
ADAPTABILITY
WINTER HARDINESS
PRODUCTIVE PLANT STAND
MASS OF 1000 GRAINS
EAR PRODUCTIVITY

description: В 2014-2019 гг в Свердловской области изучали урожайность, показатели продуктивности и адаптивности, а также связи между ними, у сортов озимой ржи для выбора перспективных высокопродуктивных генотипов. Материал для исследования - районированные сорта Паром (стандарт), Алиса и Янтарная, а также 20 новых селекционных образцов. Опыты размещали в трехпольном севообороте по чистому пару. Агротехника общепринятая для зоны. Площадь делянки - 20 м2, повторность - четырехкратная. Почва опытного участка темно-серая лесная, оподзоленная, тяжелосуглинистая, с содержанием гумуса - 3,5 %, азота - 98 мг/кг почвы, фосфора - 292 мг/кг калия - 162 мг/кг почвы. Урожайность на уровне 4,5 т/га зафиксирована у стандарта Паром, а также сортов Алиса, Янтарная, Чусовая, образцов Премьер, Викрас. Образец Дарвет (5,26 т/га) превысил стандарт по величине этого показателя на 15 %. За все годы изучения корреляция урожайности с зимостойкостью, густотой растений и стеблестоя, количеством зерен в колосе была средней (r=0,522.. .0,696), с массой 1000 зерен и продуктивностью колоса - тесной (r=0,926.0,972). Поражение снежной плесенью (Fusarium nivale Ces.) в 2017 и 2019 гг привело к снижению зимостойкости, густоты стеблестоя, урожайности (до 3,3 т/га в 2017 г). При прохладной и сырой погоде летом (ГТК=1,5.1,7) в 2014, 2015, 2017 гг масса 1000 зерен (23,1.28,2 г) и масса зерна с колоса (1,37.1,75 г) были низкими, в условиях теплой погоды и достаточного увлажнения в июле-августе (ГТК=1,0.1,4) в 2016, 2018, 2019 гг - высокими (31,9.39,2 г и 2,03.2,58 г соответственно). Лучшее сочетание показателей адаптивности урожайности отмечено у нового сорта Дарвет, который по общей адаптивной способности и селекционной ценности генотипа (ОАС=0,56 т/га; S =16,4 %; b =0,82; СЦГ=2,72) превышал стандарт (ОАС=-0,11т/га; Sg=15,4 %; b=0,93; СЦГ=2,51), но уступал ему по стабильности и пластичности.
Discovery of a red quasar with recurrent activity
Creators: name: Nandi, S.
name: Roy, R.
name: Saikia, D. J.
name: Singh, M.
name: Chandola, H. C.
name: Baes, M.
name: Joshi, R.
name: Gentile, G.
name: Patgiri, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report a new double-double radio quasar, DDRQ, J0746$+$4526 which exhibits two cycles of episodic activity. From radio continuum observations at 607 MHz using the GMRT and 1400 MHz from the FIRST survey we confirm its episodic nature. We examine the SDSS optical spectrum and estimate the black hole mass to be (8.2$\pm$0.3)$\times$10$^7$M$_\odot$ from its observed MgII emission line, and the Eddington ratio to be 0.03. The black hole mass is significantly smaller than for the other reported DDRQ, J0935+0204, while the Eddington ratios are comparable. The SDSS spectrum is significantly red continuum dominated suggesting that it is highly obscured with ${E(B-V)}_{host}=0.70\pm0.16$ mag. This high obscuration further indicates the existence of a large quantity of dust and gas along the line of sight, which may have a key role in triggering the recurrent jet activity in such objects.
description: 5 pages, 3 figures, 1 table. Accepted for publication in ApJ
ГЕНЕТИЧЕСКИЙ КОНТРОЛЬ ПОКАЗАТЕЛЕЙ ВЫХОДА ЗЕРНА В ДИАЛЛЕЛЬНОМ КОМПЛЕКСЕ ЯРОВОГО ЯЧМЕНЯ
Creators: name: ШЕВЧЕНКО С. Н.
name: ДОЛЖЕНКО Д. О.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ЯЧМЕНЬ (HORDEUM VULGARE L.)
ДИАЛЛЕЛЬНЫЙ АНАЛИЗ
КХОЗ
ИНДЕКС УРОЖАЯ
ГЕНЕТИЧЕСКИЕ СИСТЕМЫ
КОЭФФИЦИЕНТ НАСЛЕДУЕМОСТИ
BARLEY (HORDEUM VULGARE L.)
DIALLEL ANALYSIS
YIELD INDICATORS
HARVEST INDEX
GENETIC SYSTEMS
HERITABILITY COEFFICIENT

description: Исследования проводили для выявления генетического контроля показателей выхода зерна (Кхоз) в почвенноклиматических условиях лесостепи Среднего Поволжья. В системе диаллельных скрещиваний (6*6) в контрастные по гидротермическому режиму годы (2009-2010 гг.) изучали генетический контроль нескольких показателей Кхоз (индекс урожая, уборочный индекс) у ячменя: отношение массы зерна с растения к массе растения (КХР), отношение массы зерна с главного побега к массе побега (КХП), отношение массы зерна с колоса к массе главного колоса (КХК). На проявление систем генетического контроля всех изученных показателей оказывали влияние условия года исследований. Признак КХР контролируется с участием доминантных и аддитивных эффектов, в засушливый год имеет место комплементарный эпистаз и ненаправленное доминирование. Коэффициент наследуемости КХР в широком смысле - 0,70.0,82, в узком - 0,47.0,51. Наследование КХП осуществляется согласно аддитивно-доминантной модели, доминирование в F1 неполное, в F2 - полное, ненаправленное. Коэффициент наследуемости КХП в широком смысле - 0,79.0,88, в узком - 0,44.0,57. Признак КХК наследуется по аддитивнодоминантному типу с проявлением в засушливом 2010 г. эпистатических эффектов; доминирование неполное, признак увеличивают доминантные гены. Коэффициент наследуемости КХК в широком смысле - 0,88.0,95, в узком - 0,51.0,66. Селекция на увеличение признаков Кхоз может быть успешной, но отбор следует начинать в более поздних поколениях. Донорами для селекции на увеличение КХП и КХР могут быть сорта Анна (Оренбургская область) и Нутанс 553 (Саратовская область). Сорт Анна рекомендуем в качестве донора на увеличение КХР в засушливых условиях.
The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale
Creators: name: Nakayama, Kazunori
name: Takahashi, Fuminobu
name: Yanagida, Tsutomu T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The recent unidentified 3.5 keV X-ray line signal can be explained by decaying moduli dark matter with a cutoff scale one order of magnitude smaller than the Planck scale. We show that such modulus field with the low cutoff scale follows a time-dependent potential minimum and its abundance is reduced by the adiabatic suppression mechanism. As a result the modulus abundance can naturally be consistent with the observed dark matter abundance without any fine-tuning of the initial oscillation amplitude.
description: 6 pages
A Proposed Revision of Kentucky's Water Rights Legislation
Creators: name: Ausness, Richard
Publisher: name: Kentucky Water Resources Research Institute, University of Kentucky
Year: 1978

description: Abstract:
Kentucky's present system of water law consists of a statutory water withdrawal permit system superimposed upon a body of common-law water rights doctrine. The rights of water users are often uncertain under this system, particularly in periods of water shortage. The proposed revision of Kentucky's existing water rights legislation, would greatly reduce the significance of common-law water rights and would remedy some of the weaknesses in the present statute.
Part 1 of the proposed statute establishes an administrative structure; Part 2 deals with water withdrawal permits; Part 3 retains the present statute's provisions on the regulation of dams and impoundments, while Part 4 sets forth the powers and responsibilities of the Kentucky Water Resources Authority. Finally, Part 5, which deals with the regulation of water wells is included as an appendix.
Funding information: The work on which this report is based was supported in part by funds provided by the Office of Water Research and Technology, United States Department of the Interior, as authorized under the Water Resources Research Act of 1964.
ИММУНОЛОГИЧЕСКАЯ ХАРАКТЕРИСТИКА ЯЧМЕНЯ И ОВСА ПО УСТОЙЧИВОСТИ К ПРИРОДНЫМ ПОПУЛЯЦИЯМ ГОЛОВНЁВЫХ ЗАБОЛЕВАНИЙ
Creators: name: ПЯТКОВА О. В.
name: САБАЕВА О. Б.
name: ВАСЮКЕВИЧ С. В.
name: НИКОЛАЕВ П. Н.
name: МЕШКОВА Л. В.
Publisher: name: Достижения науки и техники АПК
Year: 2020
Subjects: ЯЧМЕНЬ ПОСЕВНОЙ (HORDEUM SATIVUM JESS.)
ОВЁС ПОСЕВНОЙ (AVENA SATIVA L.)
СОРТ
ГОЛОВНЯ ТВЁРДАЯ [USTILAGO HORDEI (PERS.) LAGERH
U. MLLER WILLE]
ПЫЛЬНАЯ ГОЛОВНЯ (U. TRITICI. HORDEI (JENS.)
U. AVENAE (PERS.) ROSTR. KELL. CT SW.) ЛОЖНАЯ ПЫЛЬНАЯ (ЧЕРНАЯ ПЫЛЬНАЯ) ГОЛОВНЯ (U. NIGRA TAPKE = U. AVENAE (PERS.) ROSTR.)
РЕЗИСТЕНТНОСТЬ
КОЛЛЕКЦИЯ ВИР
ОМСКАЯ ОБЛАСТЬ
COMMON BARLEY (HORDEUM SATIVUM JESS.)
COMMON OATS (AVENA SATIVA L.)
VARIETY
HEAD SMUT [USTILAGO HORDEI (PERS.) LAGERH
U. KOLLERI WILLE]
LOOSE SMUT (U. TRITICI. HORDEI (JENS .)
U. AVENAE (PERS.) ROSTR. KELL. ET SW.)
FALSE LOOSE SMUT (U. NIGRA TAPKE = U. AVENAE (PERS.) ROSTR.)
RESISTANCE
COLLECTION OF THE ALL-RUSSIAN VAVILOV INSTITUTE OF PLANT GENETIC RESOURCES
OMSK REGION

description: Цель работы - характеристика сортов и линий ячменя и овса отечественной и зарубежной селекции по устойчивости к возбудителям головнёвых заболеваний для выделения лучших и перспективных для селекции образцов в условиях Омской области. Материалом для исследования служили сорта Омского аграрного научного центра (восемь ячменя и девять овса), 35 образцов ячменя и 60 овса коллекции Всероссийского института генетических ресурсов растений им. Н.И. Вавилова (ВИР). Оценку устойчивости растений осуществляли в полевых условиях на искусственном инфекционном фоне в 2016-2019 гг. по общепринятым методикам. Перед посевом семена ячменя инокулировали телиоспорами Ustilago hordeiи U. nigra, овса - Ustilago avenae и U. mlEn, растения ячменя во время цветения инфицировали телиоспорами U. nuda. Сравнивали устойчивость сортов по проценту поражения и индексу устойчивости (ИУ). Среди новых поступлений коллекционных образцов ячменя по сочетанию продуктивности с устойчивостью к твёрдой и чёрной головне выделили образцы Так-Мак (Красноярский край), Поспех (к-31122, Беларусь) и Соборный (Украина). По результатам оценки образцов овса резистентность проявили TERRUF (к-15474, США) - поражение до 2,2 % и CY 3300 (к-15476, США) - до 0,9 %, при поражении сорта Орион до 77,8 %. Согласно анализу местной популяции пыльной головни ячменя эффективность к возбудителю сохранили сортообразцы ячменя с генами Run 3 (Paragon) и Run 6 (Keystone). Устойчивость линий с генами Run 1 и Run 7 была преодолена к 2017 г Изменения в структуре популяций головнёвых заболеваний овса при дифференциации на наборе тест-сортов за последние годы не зафиксированы, по-прежнему устойчивы сорта Victory, Fulghum и Black Mesdag.
A smooth introduction to the wavefront set
Creators: name: Brouder, Christian
name: Dang, Nguyen Viet
name: Hélein, Frédéric
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The wavefront set provides a precise description of the singularities of a distribution. Because of its ability to control the product of distributions, the wavefront set was a key element of recent progress in renormalized quantum field theory in curved spacetime, quantum gravity, the discussion of time machines or quantum energy inequalitites. However, the wavefront set is a somewhat subtle concept whose standard definition is not easy to grasp. This paper is a step by step introduction to the wavefront set, with examples and motivation. Many different definitions and new interpretations of the wavefront set are presented. Some of them involve a Radon transform.
description: 29 pages, 7 figures
Optical conductivity of a two-dimensional metal at the onset of spin-density-wave order
Creators: name: Chubukov, Andrey V.
name: Maslov, Dmitrii L.
name: Yudson, Vladimir I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the optical conductivity of a clean two-dimensional metal near a quantum spin-density-wave transition. Critical magnetic fluctuations are known to destroy fermionic coherence at "hot spots" of the Fermi surface but coherent quasiparticles survive in the rest of the Fermi surface. A large part of the Fermi surface is not really "cold" but rather "lukewarm" in a sense that coherent quasiparticles in that part survive but are strongly renormalized compared to the non-interacting case. We discuss the self-energy of lukewarm fermions and their contribution to the optical conductivity, $σ(Ω)$, focusing specifically on scattering off composite bosons made of two critical magnetic fluctuations. Recent study [S.A. Hartnoll et al., Phys. Rev. B {\bf 84}, 125115 (2011)] found that composite scattering gives the strongest contribution to the self-energy of lukewarm fermions and suggested that this may give rise to non-Fermi liquid behavior of the optical conductivity at the lowest frequencies. We show that the most singular term in the conductivity coming from self-energy insertions into the conductivity bubble, $σ'(Ω)\propto \ln^3Ω/Ω^{1/3}$, is canceled out by the vertex-correction and Aslamazov-Larkin diagrams. However, the cancelation does not hold beyond logarithmic accuracy, and the remaining conductivity still diverges as $1/Ω^{1/3}$. We further argue that the $1/Ω^{1/3}$ behavior holds only at asymptotically low frequencies, well inside the frequency range affected by superconductivity. At larger $Ω$, up to frequencies above the Fermi energy, $σ'(Ω)$ scales as $1/Ω$, which is reminiscent of the behavior observed in the superconducting cuprates.
description: 28 pages, 13 figures
Relationships Between Atomic Diffusion Mechanisms and Ensemble Transport Coefficients in Crystalline Polymorphs
Creators: name: Morgan, Benjamin J.
name: Madden, Paul A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ionic transport in conventional ionic solids is generally considered to proceed via independent diffusion events or "hops''. This assumption leads to well-known Arrhenius expressions for transport coefficients, and is equivalent to assuming diffusion is a Poisson process. Using molecular dynamics simulations of the low-temperature B1, B3, and B4 AgI polymorphs, we have compared rates of ion-hopping with corresponding Poisson distributions to test the assumption of independent hopping in these common structure-types. In all cases diffusion is a non-Poisson process, and hopping is strongly correlated in time. In B1 the diffusion coefficient can be approximated by an Arrhenius expression, though the physical significance of the parameters differs from that commonly assumed. In low temperature B3 and B4 diffusion is characterised by concerted motion of multiple ions in short closed loops. Diffusion coefficients can not be expressed in a simple Arrhenius form dependent on single-ion free-energies, and intrinsic diffusion must be considered a many-body process.