cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Post-release assessment of Aphalara itadori (Hemiptera: Psyllidae) as a classical biological control agent of Fallopia japonica (Polygonaceae)
Creators: name: Clewley, Gary
Publisher: name: Imperial College London
Year: 2014

description: Fallopia japonica is a damaging invasive weed that is difficult to control in the UK. In 2010, Aphalara itadori (Hemiptera), an insect herbivore native to Japan, was released in the UK as a biocontrol agent. Classical biocontrol of weeds has a long history across the world but this is an unprecedented type of release for the European Union. This provided the opportunity to investigate the conditions for establishment and the potential impacts of A. itadori under semi-natural conditions awaiting the potential establishment of large field populations in the UK. A meta-analysis, using global data, was carried out to see if classical biocontrol is an effective method of weed management. Field cage trials were then used to assess some life-history traits of A. itadori, including fecundity and longevity. Factors influencing establishment, including rainfall, competition and the role of generalist predators were investigated. The ability to cause damage to F. japonica is essential for a successful programme and this was tested, both directly and indirectly considering the performance of native plant species grown with F. japonica with and without biocontrol. Finally, the integration of biocontrol with existing control methods and preliminarily with another biocontrol agent, Mycosphaerella polygoni-cuspidati, a leaf-spot pathogen was investigated. Aphalara itadori showed the potential to be an effective biocontrol agent with the capacity to successfully reproduce outside, with potentially two generations per year in some areas of the UK. There were demonstrable impacts of A. itadori herbivory on F. japonica within a single growing season. Nonetheless, there was a discrepancy between the predicted performance from this study and what has been observed at the open field release sites. This is possibly a result of the effect of predation on A. itadori survival so recommendations, such as the use of protective cages, are suggested to inform the release strategy.
An adaptive algorithm for n-body field expansions
Creators: name: Weinberg, Martin D.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An expansion of a density field or particle distribution in basis functions which solve the Poisson equation both provides an easily parallelized n-body force algorithm and simplifies perturbation theories. The expansion converges quickly and provides the highest computational advantage if the lowest-order potential-density pair in the basis looks like the unperturbed galaxy or stellar system. Unfortunately, there are only a handful of such basis in the literature which limits this advantage. This paper presents an algorithm for deriving these bases to match a wide variety of galaxy models. The method is based on efficient numerical solution of the Sturm-Liouville equation and can be used for any geometry with a separable Laplacian. Two cases are described in detail. First for the spherical case, the lowest order basis function pair may be chosen to be exactly that of the underlying model. The profile may be cuspy or have a core and truncated or of infinite extent. Secondly, the method yields a three-dimensional cylindrical basis appropriate for studying galaxian disks. In this case, the vertical and radial bases are coupled; the lowest order radial part of the basis function can be chosen to match the underlying profile only in the disk plane. Practically, this basis is still a very good match to the overall disk profile and converges in a small number of terms.
description: 16 pages, 5 figures, submitted to AJ
Solution-processable hole-transporting inorganic semiconductors for electronic applications
Creators: name: Pattanasattayavong, Pichaya
Publisher: name: Imperial College London
Year: 2014

description: This thesis presents the development of solution-processable hole-transporting inorganic semiconductors for electronic applications. As the improvement of electron-transporting oxides, such as ZnO, In2O3, and SnO2, has continued to advance, the progress on the hole-transporting counterparts is still largely lagging behind. Copper(I) oxide (Cu2O) is one of a handful oxide materials that shows hole transport. This thesis shows the first demonstration of p-channel TFTs from Cu2O thin films processed from the spray pyrolysis technique. The field-effect hole mobility (µ_FE) is in the range of 10^–4 to 10^–3 cm^2/(V.s) while the on-to-off channel current ratio (I_D^on-off) is on the order of 10^3. The work presented here emphasises the versatility of the spray pyrolysis, which has previously been employed to successfully produce n-type oxides and dielectrics. Another copper(I)-based inorganic compound, copper(I) thiocyanate (CuSCN), has a unique combination of good hole-transporting characteristics and excellent optical transparency. This thesis presents extensive characterisation results of CuSCN thin films from their chemical, electronic, optical, morphological, to structural properties and demonstrates, for the first time, p-channel TFTs with a truly transparent active layer based on a solution-processed wide-band-gap inorganic semiconductor. µ_FE in the range of 0.01–0.1 cm^2/(V.s) has been achieved whereas I_D^on-off is on the order of 10^4. A p-channel unipolar voltage inverter has also been constructed from CuSCN TFTs, showing the possibility of realising transparent electronics. CuSCN-based TFTs are also studied in more details by analysing their transfer characteristics for the distribution of localised states and examining their temperature dependence for the hole transport modes. Furthermore, due to its novel electronic and optical properties, CuSCN is also offered as a replacement of PEDOT:PSS as a hole-transporting layer in bulk-heterojunction organic photovoltaics (OPVs) and organic light-emitting diodes (OLEDs). Owing to its superior optical transparency, CuSCN-based solar cells consistently exhibit higher power conversion efficiency (PCE) than PEDOT:PSS-based cells, especially in the case of cells employing active layers that absorb light in the near-infrared spectral range. Specifically, cells based on PDPP-2T-TT:PC71BM show PCE of ~8% with CuSCN HTL compared to ~6.2% with PEDOT:PSS HTL. In addition, the energy levels of CuSCN lead to a lower hole injection barrier as well as effective electron blocking property, yielding OLEDs with a low turn-on voltage and low leakage current. OLEDs employing an active layer of (PPy)2Ir(acac) in 26DCzPy:TCTA with CuSCN HTL show higher values of highest achievable efficacies (51 cd/A and 55 lm/W at 1 cd/m^2) compared to those with PEDOT:PSS HTL (38 cd/A at 2142 cd/m^2 and 14 lm/W at 1710 cd/m^2).
De Sitter and Power-law Solutions in Non-local Gauss-Bonnet Gravity
Creators: name: Elizalde, E.
name: Odintsov, S. D.
name: Pozdeeva, E. O.
name: Vernov, S. Yu.
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: 83F05

description: The cosmological dynamics of a non-locally corrected gravity theory, involving a power of the inverse d'Alembertian, is investigated. Casting the dynamical equations into local form, the fixed points of the models are derived, as well as corresponding de Sitter and power-law solutions. Necessary and sufficient conditions on the model parameters for the existence of de Sitter solutions are obtained. The possible existence of power-law solutions is investigated, and it is proven that models with de Sitter solutions have no power-law solutions. A model is found, which allows to describe the matter-dominated phase of the Universe evolution.
description: 15 pages, v2: accepted for publication in International Journal of Geometric Methods in Modern Physics, references added
Adaptive multistable flexible composite structures
Creators: name: Cui, Yuefeng
Publisher: name: Imperial College London
Year: 2015

description: A composite laminate with unsymmetric layup may exhibit two distinct stable configurations at room temperature due to the residual thermal stresses imparted during curing. This bistability leads unsymmetric composite laminates to be good candidates for adaptive flexible structures in particular for the fields of aerospace and aircraft. To extend the application potential of bistable composite laminates, the multistable behaviour of continuous compound composite surfaces are investigated. Two connection approaches are presented in this research. By tailoring the asymmetric bistability of indi- vidual composite elements, continuous surfaces composed of series-connected bistable composite shells demonstrate a high degree of multistability. This model can be developed to design longer composite surfaces possessing more stable shapes. In addition, a high degree of multistability is achieved by connecting square composite elements in a tessellated feature. By reducing the interactions between adjacent elements, a tessellated surface composed of n bistable elements shows a theoretical maximum 2n stable shapes. Finally, potential applications of highly multistable composite surfaces are introduced. The proposed multistable designs improve the flexible functionality of the adaptive structures.
Additional file 1 of Optimize the dose of oxaliplatin for locally advanced rectal cancer treated with neoadjuvant chemoradiotherapy followed by radical surgery and adjuvant chemotherapy
Creators: name: Chang, Hui
name: Tao, Ya-lan
name: Jiang, Wu
name: Chen, Chen
name: Liu, Shi-liang
name: Ye, Wei-jun
name: Gao, Yuan-hong
Publisher: name: figshare
Year: 2020
Subjects: Medicine
Cell Biology
Biotechnology
Biological Sciences not elsewhere classified
Cancer

description: Additional file 1: Table S1. Multivariate survival analysis in patients treated with total chemotherapy cycle ≥7.
NECTALIS
Creators: name: ALLAIN Valérie
Publisher: name: Sismer
Year: 2011

description: Notre projet porte sur l'étude des niveaux trophiques intermédiaires de l'écosystème pélagique : le zooplancton et le micronecton. En s'appuyant à la fois sur des observations, de l'instrumentation et de la modélisation, notre projet s'intéresse à la réponse des organismes vivants aux forçages physiques et chimiques de l'environnement. Nous cherchons à mieux comprendre les mécanismes structurant l'écosystème pélagique qui soutient les pêcheries de thon dans la zone économique calédonienne (ZEE) et, plus généralement, dans le Pacifique sud.Le projet allie les compétences de dynamiciens, statisticiens, acousticiens, biogéochimistes, océanographes, biologistes et halieutes de plusieurs organisations de recherche, pour modéliser et analyser les observations sur les niveaux trophiques intermédiaires. L'un des objectifs de notre étude est d'explorer la capacité des ADCP, à fournir des informations sur la distribution du zooplancton/micronecton et sur leur abondance dans la ZEE calédonienne. En plus de la compréhension directe liées aux nouvelles observations, nous cherchons à améliorer notre compréhension de la distribution et du comportement des proies des thons en paramétrisant/validant notre modèle de proies grâce aux campagnes à la mer. Le but à plus long terme est d'améliorer notre compréhension de la distribution et du comportement des proies des thons pour mieux comprendre les relations thons - environnement dans la ZEE calédonienne.
Ranunculus lanuginosus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ranunculales
Ranunculaceae
Ranunculus
Ranunculus lanuginosus

description: Ranunculus lanuginosus, spec. nov.
29. Ranunculus foliis tripartitis acute sinuatis tomentosis.
 Ranunculus foliis radicalibus pinnatis. Sauv. monsp. 227.
 Ranunculus montanus lanuginosus, foliis ranunculi pratensis repentis. Bauh. pin. 182. prodr.96.
 Ranunculus magnus valde hirsutus, flore luteo. Bauh. hist. 3. p.417.
 Habitat Monspelii . ♃
 Caulis altus, erectus. Folia Aconiti s. Ran. acris, sed magis incisa. Semina acuta, compressa.
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on pages 554-555, DOI: 10.5281/zenodo.3931989
Scale Space Approximation in Convolutional Neural Networks for Retinal Vessel Segmentation
Creators: name: Noh, Kyoung Jin
name: Park, Sang Jun
name: Lee, Soochahn
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Retinal images have the highest resolution and clarity among medical images. Thus, vessel analysis in retinal images may facilitate early diagnosis and treatment of many chronic diseases. In this paper, we propose a novel multi-scale residual convolutional neural network structure based on a \emph{scale-space approximation (SSA)} block of layers, comprising subsampling and subsequent upsampling, for multi-scale representation. Through analysis in the frequency domain, we show that this block structure is a close approximation of Gaussian filtering, the operation to achieve scale variations in scale-space theory. Experimental evaluations demonstrate that the proposed network outperforms current state-of-the-art methods. Ablative analysis shows that the SSA is indeed an important factor in performance improvement.
description: 10 pages, 7 figures
The Nucleon Spectral Function at Finite Temperature and the Onset of Superfluidity in Nuclear Matter
Creators: name: Alm, T.
name: Roepke, G.
name: Schnell, A.
name: Kwong, N. H.
name: Koehler, H. S.
Publisher: name: arXiv
Year: 1995
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Nucleon selfenergies and spectral functions are calculated at the saturation density of symmetric nuclear matter at finite temperatures. In particular, the behaviour of these quantities at temperatures above and close to the critical temperature for the superfluid phase transition in nuclear matter is discussed. It is shown how the singularity in the thermodynamic T-matrix at the critical temperature for superfluidity (Thouless criterion) reflects in the selfenergy and correspondingly in the spectral function. The real part of the on-shell selfenergy (optical potential) shows an anomalous behaviour for momenta near the Fermi momentum and temperatures close to the critical temperature related to the pairing singularity in the imaginary part. For comparison the selfenergy derived from the K-matrix of Brueckner theory is also calculated. It is found, that there is no pairing singularity in the imaginary part of the selfenergy in this case, which is due to the neglect of hole-hole scattering in the K-matrix. From the selfenergy the spectral function and the occupation numbers for finite temperatures are calculated.
description: LaTex, 23 pages, 21 PostScript figures included (uuencoded), uses prc.sty, aps.sty, revtex.sty, psfig.sty (last included)
Ranunculus lanuginosus Linnaeus 1753
Creators: name: Jarvis, Charlie
Publisher: name: Linnaean Society of London in association with the Natural History Museum
Year: 2007
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ranunculales
Ranunculaceae
Ranunculus
Ranunculus lanuginosus

description: Ranunculus lanuginosus Linnaeus, Species Plantarum 1: 554. 1753.
"Habitat Monspelii." RCN: 4090.
Lectotype (La Valva & Caputo in Delpinoa, n.s., 27-28: 42. 1988): Herb. Burser IX: 141 (UPS).
Current name: Ranunculus lanuginosus L. (Ranunculaceae).
Note: Lacaita (in Bull. Orto Bot. Napoli 3: 257-258. 1913) and others such as Jelenevsky & Derviz-Sokolova (in Novosti Sist. Vyssh. Rast. 16: 117. 1979) treated 715.59 (LINN) as the type. However, this was a post-1753 addition to the collection, and La Valva & Caputo (who illustrated the Linnaean material as their Tav. I) therefore rejected this choice, designating Herb. Burser IX: 141 (UPS) as lectotype in its place.
description: Published as part of Jarvis, Charlie, 2007, Chapter 7: Linnaean Plant Names and their Types (part R), pp. 785-805 in Order out of Chaos. Linnaean Plant Types and their Types, London :Linnaean Society of London in association with the Natural History Museum on page 786, DOI: 10.5281/zenodo.291971
Photon Damping of Waves in Accretion Disks
Creators: name: Agol, Eric
name: Krolik, Julian
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: MHD turbulence is generally believed to have two important functions in accretion disks: it transports angular momentum outward, and the energy in its shortest wavelength modes is dissipated into the heat that the disks radiate. In this paper we examine a pair of mechanisms which may play an important role in regulating the amplitude and spectrum of this turbulence: photon diffusion and viscosity. We demonstrate that in radiation pressure-dominated disks, photon damping of compressive MHD waves is so rapid that it likely dominates all other dissipation mechanisms.
description: 30 pages, 3 figures, accepted for publication in ApJ
Effects of the Dzyaloshinsky-Moriya interaction on nonequilibrium thermodynamics in the $XY$ chain in a transverse field
Creators: name: Wang, Qian
name: Cao, Duo
name: Quan, H. T.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We examine the effects of the Dzyaloshinsky-Moriya (DM) interaction on the nonequilibrium thermodynamics in an anisotropic $XY$ spin chain, which is driven out of equilibrium by a sudden quench of the control parameter of the Hamiltonian. By analytically evaluating the statistical properties of the work distribution and the irreversible entropy production, we investigate the influences of the DM interaction on the nonequilibrium thermodynamics of the system with different parameters at various temperatures. We find that depending on the anisotropy of the system and the temperature, the DM interaction may have different impacts on the nonequilibrium thermodynamics. Interestingly, the critical line induced by the DM interaction can be revealed via the properties of the nonequilibrium thermodynamics. In addition, our results suggest that the strength of the DM interaction can be detected experimentally by studying the nonequilibrium thermodynamics.
description: 9 pages, 7 figures
Transforming MARC for a Linked Data Age
Creators: name: Deng, Sai
name: Zhu, Lihong
Publisher: name: Washington State University
Year: 2025
Subjects: Linked Data
MARC
BIBFRAME

description: This talk will focus on the transition of MARC to a linked data environment and summarize the Core MARC Formats Transition Interest Group’s program during the 2025 ALA Core IG Week. The talk will cover Ex Libris' efforts to facilitate MARC to Linked Data workflows within Alma and Primo, the Library of Congress' BFProd (BIBFRAME in Production) initiative and "Modern MARC" effort for better alignment with linked data, OCLC's approach to leveraging linked data in the hybrid environment, and pedagogical strategies for teaching linked data to future librarians. These presentations will offer valuable insights, tools, and methodologies for libraries navigating the hybrid MARC and linked data environment, enhancing interoperability, discovery, and metadata quality in this evolving landscape. The session will conclude with a brief open discussion.
Sterile Neutrino Constraints from the STEREO Experiment with 66 days of Reactor-on Data
Creators: name: Almazán, H.
name: Sanchez, P. del Amo
name: Bernard, L.
name: Blanchet, A.
name: Bonhomme, A.
name: Buck, C.
name: Favier, J.
name: Haser, J.
name: Hélaine, V.
name: Kandzia, F.
name: Kox, S.
name: Lamblin, J.
name: Letourneau, A.
name: Lhuillier, D.
name: Lindner, M.
name: Manzanillas, L.
name: Materna, T.
name: Minotti, A.
name: Montanet, F.
name: Pessard, H.
name: Real, J. -S.
name: Roca, C.
name: Salagnac, T.
name: Schoppmann, S.
name: Sergeyeva, V.
name: Soldner, T.
name: Stutz, A.
name: Zsoldos, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5\% C.L.
Reminiscences of Kathleen S. Partlon 1979
Publisher: name: Columbia University
Year: 2019
Subjects: Dancers
Modern dance

description: Experiences as a student at Bennington, 1934; studies with Martha Graham in New York, 1934-1938; touring and working as a member of the Graham company; impressions of Martha Graham, Louis Horst, others.
Ranunculus lapponicus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ranunculales
Ranunculaceae
Ranunculus
Ranunculus lapponicus

description: Ranunculus lapponicus, spec. nov.
 23. Ranunculus foliis tripartitis lobatis obtusis, caule subnudo unifloro. Fl. suec. 461. *
 Ranunculus caule unifolio unifloro, foliis tripartitis. Fl. lapp. 231. t.3. f.4. *
 Habitat in Alpibus Lapponicis .
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 553, DOI: 10.5281/zenodo.3931989
Amplitude ambiguities in pseudoscalar meson photoproduction
Creators: name: Keaton, Greg
name: Workman, Ron
Publisher: name: arXiv
Year: 1995
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider the problem of determining amplitudes from observables for the case of pseudoscalar meson photoproduction. We find a number of surprisingly simple constraints which give necessary conditions for a complete set of measurements. These results contradict one of the selection rules derived previously.
description: 7 pages
Post translational modifications regulate the function of E4bp4
Creators: name: Kostrzewski, Tomasz
Publisher: name: Imperial College London
Year: 2014

description: The basic leucine zipper transcription factor E4bp4 is essential for various immunological processes, most notably the development of natural killer (NK) cells. E4bp4 is required at the point of lineage commitment when NK cell progenitors develop from common lymphoid progenitors. E4bp4 promotes NK cell development by directly regulating the expression of other transcription factors, including Eomes and Id2. Despite its critical role, little is known about how the functions of the E4bp4 protein are regulated within the cellular environment. This study demonstrates that E4bp4 is post translationally modified by phosphorylation and SUMOylation and that these modifications directly regulate the protein’s function. In the absence of either modification, E4bp4 is both a more potent transcriptional activator and transcriptional repressor. In NK cells, the absence of post translational modifications on E4bp4 promotes the expression of target genes Notch1 and E2A. Most strikingly, when expressed in hematopoietic progenitor cells, versions of E4bp4 lacking phosphorylation or SUMOylation sites, promote the development of up to three times more NK cells than the wild type form of E4bp4. This work has implications for the production of NK cells for use in immunotherapy and provides the first evidence that SUMOylation of an individual transcription factor protein can regulate a highly complex cellular process.
Ranunculus lapponicus Linnaeus 1753
Creators: name: Jarvis, Charlie
Publisher: name: Linnaean Society of London in association with the Natural History Museum
Year: 2007
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ranunculales
Ranunculaceae
Ranunculus
Ranunculus lapponicus

description: Ranunculus lapponicus Linnaeus, Species Plantarum 1: 553. 1753.
"Habitat in Alpibus Lapponicus." RCN: 4084.
Lectotype (Benson in Amer. Midl. Naturalist 52: 369. 1954): Herb. Linn. No. 715.43 (LINN).
Current name: Ranunculus lapponicus L. (Ranunculaceae).
description: Published as part of Jarvis, Charlie, 2007, Chapter 7: Linnaean Plant Names and their Types (part R), pp. 785-805 in Order out of Chaos. Linnaean Plant Types and their Types, London :Linnaean Society of London in association with the Natural History Museum on page 786, DOI: 10.5281/zenodo.291971
Polygenic adaptation in changing environments
Creators: name: Jain, Kavita
name: Devi, Archana
Publisher: name: arXiv
Year: 2018
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Although many phenotypic traits are determined by a large number of genetic variants, how a polygenic trait adapts in response to the changes in the environment is still poorly understood. Here we study the adaptation dynamics of a polygenic trait that is determined by a finite number of genetic loci in an infinitely large population which is evolving under stabilising selection and recurrent mutations. We find that in a changing environment, modeled here by a linearly moving phenotypic optimum, the mean trait also moves linearly with time. But its speed is smaller than that of the phenotypic optimum when the effect sizes of the genetic variants are small and approaches that of the environmental change for larger effect sizes. Our study thus highlights the influence of the genetic architecture of a polygenic trait on its adaptability.
All-loop singularities of scattering amplitudes in massless planar theories
Creators: name: Prlina, Igor
name: Spradlin, Marcus
name: Stanojevic, Stefan
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In massless quantum field theories the Landau equations are invariant under graph operations familiar from the theory of electrical circuits. Using a theorem on the $Y$-$Δ$ reducibility of planar circuits we prove that the set of first-type Landau singularities of an $n$-particle scattering amplitude in any massless planar theory, in any spacetime dimension $D$, at any finite loop order in perturbation theory, is a subset of those of a certain $n$-particle $\lfloor{(n{-}2)^2/4}\rfloor$-loop "ziggurat" graph. We determine this singularity locus explicitly for $D=4$ and $n=6$ and find that it corresponds precisely to the vanishing of the symbol letters familiar from the hexagon bootstrap in SYM theory. Further implications for SYM theory are discussed.
description: 6 pages, 4 figures; v2: minor improvements and clarifications, including an expanded section VIII
Ultraviolet images of the gravitationally lensed quadruple quasar Q2237+0305 with the HST
Creators: name: Blanton, M.
name: Turner, E. L.
name: Wambsganss, J.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze observations of the quadruple lensed quasar Q2237+0305, taken with the WFPC2 camera in the F336W and F300W bands. 25 exposures were performed within 15 hours real time on 3 November 1995. On a timescale of 3--4 hours, we observe no variation in component A of greater than 0.02 mag. The other components are constant over a period of 10 hours to within about 0.05 mag. In the final 5 hours there is some evidence (not conclusive) for variation of component D by about 0.1 mag. Component A was brighter than component B by about 0.3 mag. Components C and D were fainter than component A by about 1.3 and 1.4 mag. Any fifth (central) component was at least 6.5 mag fainter than component A. Using the PC chip, we measure the relative distances of the four components with high accuracy. Our values are systematically larger than other investigators' (by 0.1% to 2.0%). The F336W filter had been chosen for the observations because it could have allowed us to see extended Ly-alpha emission from the Broad-Line Region (BLR). However, the quasar components are consistent with a point source. We conclude that there cannot be a Ly-alpha feature in the image plane brighter than about 23.5 mag in F336W and further from the quasar core than 100 mas. According to a lensing model by Rix, Scheider & Bahcall (1992), this would preclude any such features in the source plane further than 20 mas (~ 100 h^{-1} pc, assuming q_0 = 0.5) from the quasar core and brighter than 25 mag before magnification.
description: 16 pages, Latex, 9 figures, accepted by MNRAS, 3 tables added
Do we have three $S_{11}$ resonances in the second resonance region?
Creators: name: Li, Zhenping
name: Workman, Ron
Publisher: name: arXiv
Year: 1995
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We review the status of the $S_{11}$ N$^*$ resonances in light of some recent theoretical and phenomenological results. Whereas the quark model predicts two such resonances around 1.6 GeV, there is considerable evidence for a third $S_{11}$ resonance in this energy range. This suggests that a $KΣ$ or $KΛ$ quasi-bound state may indeed exist below the kaon production threshold. We show that kaon production experiments, in particular $K^0$ photoproduction off nucleons, would be very sensitive to the existence of the third $S_{11}$ resonance.
description: 9 pages and 1 figure. The figure is available at ftp://clsaid.phys.vt.edu/pub/pr/s11.ps
Reminiscences of Katie Louchheim 1973
Publisher: name: Columbia University
Year: 2019
Subjects: Women--Political activity
Presidents--Election--1952.--United States
Presidents--Election--1956.--United States
Political conventions
Political refugees

description: Office of Foreign Relief and Rehabilitation, 1942; creation of United Nations Relief and Rehabilitation Administration; Atlantic City and Montreal conferences; tour of Displaced Persons camps in Europe; Democratic National Convention, 1948; Democratic National Committeewoman, 1952; Director of Women's Activities, Democratic Party, 1953; Adlai Stevenson presidential campaigns 1952, 1956; impressions of Adlai Stevenson, Herbert H. Lehman, Daisy Harriman.
Additional file 5 of Functional MYB transcription factor gene HtMYB2 is associated with anthocyanin biosynthesis in Helianthus tuberosus L
Creators: name: Gao, Jieming
name: Sun, Xuemei
name: Zong, Yuan
name: Yang, Shipeng
name: Wang, Lihui
name: Liu, Baolong
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 5: Table S4. The origin of the Helianthus tuberosus and their MYB genotype examined using HtproS marker.
Globular Cluster Photometry with the Hubble Space Telescope VII. Color Gradients and Blue Stragglers in the Central Region of M30 (NGC 7099) from WFPC2 Observations
Creators: name: Guhathakurta, Puragra
name: Webster, Zodiac T.
name: Yanny, Brian
name: Schneider, Donald P.
name: Bahcall, John N.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present F555W (V), F439W (B), and F336W (U) photometry of 9507 stars in the central 2' of the dense, post core collapse cluster M30 (NGC 7099) derived from HST WFPC2 images. These data are used to study the mix of stellar populations in the central region of the cluster. Forty eight blue straggler stars are identified and are found to be strongly concentrated towards the center. The specific frequency of blue stragglers, F_BSS\equiv N(BSS)/N(V
description: To appear in the Astronomical Journal. 42 pages, 13 figures, 4 tables, full resolution figures and complete data tables available at ftp://eku.sns.ias.edu/pub/GLOBULAR_CLUSTERS/m30-ppr7/ or http://www.ucolick.org/~zodiac/m30/
Computational and theoretical studies of metallic dust transport in Tokamaks
Creators: name: Somboonkittichai, Nopparit
Publisher: name: Imperial College London
Year: 2015

description: The plasma facing surfaces of the ITER are going to contain beryllium for the first wall and tungsten for the divertors. To test their benefits for the future operations, the JET is now run with the ITER-like walls. The ASDEX Upgrade has placed full tungsten surfaces inside it, so a large amount of tungsten dust grains are produced. The WEST divertor was recently set up in the Tore-Supra. There are some tokamaks which may not use the ITER-like materials but still metal, e.g. the FTU. Also the diagnostic tool can provide metallic dust grains in a chamber. With the high heat output of the future metallic tokamaks, much more metallic dust grains should be produced, the situation of which never occurs. We focus on studying two phenomena related to metallic dust grains in a plasma: the avalanche erosion done by high velocity impacts; and the misty plasma physics for charged droplet and bubble. For the former, we use the dust transport code, DTOKS to simulate iron dust grains re-entering the plasma, corresponding to the FTU, from the bottom. We find that only certain ranges of core plasma flow speed, launch direction and initial dust size result in acheiving a high velocity dust grain. In misty plasma, for a large droplet, we modify the electrostatic stability limit by the use of the MOML theory and the liquid pressure by the use of the conservation of the ion momentum flux. The bubble in the plasma may originate from the boiling molten layer on plasma facing surfaces or the transformation from the superheated droplets. We calculate the bubble electrostatic stability limit by the Lord Rayleigh's approach. It is surprisingly that the basic instability initiates at l = 3 rather than l = 2.
Nucleation Rate of Hadron Bubbles in Baryon-Free Quark-Gluon Plasma
Creators: name: Ruggeri, Franco
name: Friedman, William
Publisher: name: arXiv
Year: 1995
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We evaluate the factor $κ$ appearing in Langer's expression for the nucleation rate extended to the case of hadron bubbles forming in zero baryon number cooled quark-gluon plasma. We consider both the absence and presence of viscosity and show that viscous effects introduce only small changes in the value of $κ$
description: 9 pages, revtex, no figures Full postscript version available at via the WWW at http://nucth.physics.wisc.edu/preprints/ or by via from ftp://nucth.physics.wisc.edu/pub/preprints/mad-nt-95-06.ps
ASPEX
Creators: name: MARIE Louis
Publisher: name: Sismer
Year: 2009

description: L'objectif des campagnes ASPEX menées en 2009, 2010 et 2011 sur les N/Os Thalassa et Suroît était de déployer et maintenir sur les plateaux Armoricain et Aquitain et sur la pente continentale qui les jouxte un réseau de 12 mouillages courantométriques destinés à obtenir une description de la variabilité des courants, des échelles horaires à inter-annuelles. Ces campagnes ont de plus permis la réalisation d'un important ensemble de sections hydrologiques, conduites sur les transits entre les points de déploiement/récupération des mouillages au moyen d'un poisson remorqué Scanfish équipé d'un capteur CTD SBE49 et d'un fluorimètre/turbidimètre Wetlabs FLNTU.L'objectif des campagnes ASPEX menées depuis 2012 sur les N/Os Côtes de la Manche, Gwen Drez et Thalia est de collecter une série temporelle longue d'observations de la structure hydrologique du plateau Armoricain, au moyen de flotteurs profilants ARVOR-C déployés sur un rythme annuel dans la zone spatialement homogène du "bourrelet froid". Des stations CTD de contrôle sont réalisées lors de ces campagnes. Les flotteurs sont réutilisés après retour chez le fabricant pour remise en état et recalibration.
Spectral Decorrelation of Nuclear Levels in the Presence of Continuum Decay
Creators: name: Drożdż, S.
name: Trellakis, A.
name: Wambach, J.
Publisher: name: arXiv
Year: 1995
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The fluctuation properties of nuclear giant resonance spectra are studied in the presence of continuum decay. The subspace of quasi-bound states is specified by one-particle one-hole and two-particle two-hole excitations and the continuum coupling is generated by a scattering ensemble. It is found that, with increasing number of open channels, the real parts of the complex eigenvalues quickly decorrelate. This appears to be related to the transition from power-law to exponential time behavior of the survival probability of an initially non-stationary state.
description: 10 Pages, REVTEX, 4 PostScript figures
Dynamic service placement in mobile micro-clouds
Creators: name: Wang, Shiqiang
Publisher: name: Imperial College London
Year: 2015

description: Cloud computing is an important enabling technique for running complicated applications on resource-limited handheld devices, personal computers, or small enterprise servers, by offloading part of the computation and storage to the cloud. However, traditional centralized cloud architectures are incapable of coping with many emerging applications that are delay-sensitive and require large amount of data exchange between the front-end and back-end components of the application. To tackle these issues, the concept of mobile micro-cloud (MMC) has recently emerged. An MMC is typically connected directly to a network component, such as a wireless basestation, at the edge of the network and provides services to a small group of users. In this way, the communication distances between users and the cloud(s) hosting their services are reduced, and thus users can have more instantaneous access to cloud services. Several new challenges arise in the MMC context, which are mainly caused by the limited coverage area of basestations and the dynamic nature of mobile users, network background traffic, etc. Among these challenges, one important problem is where (on which cloud) to place the services (or, equivalently, to execute the service applications) to cope with the user demands and network dynamics. We focus on this problem in this thesis, and consider both the initial placement and subsequent migration of services, where migration may occur when the user location or network conditions change. The problem is investigated from a theoretical angle with practical considerations. We first abstract the service application and the physical cloud system as graphs, and propose online approximation algorithms for finding the placement of an incoming stream of application graphs onto the physical graph. Then, we consider the dynamic service migration problem, which we model as a Markov decision process (MDP). The state space of the MDP is large, making it difficult to solve in real-time. Therefore, we propose simplified solution approaches as well as approximation methods to make the problem tractable. Afterwards, we consider more general non-Markovian scenarios but assume that we can predict the future costs with a known accuracy. We propose a method of dynamically placing each service instance upon its arrival and a way of finding the optimal look-ahead window size for cost prediction. The results are verified using simulations driven by both synthetic and real-world data traces. Finally, a framework for emulating MMCs in a more practical setting is proposed. In our view, the proposed solutions can enrich the fundamental understanding of the service placement problem. It can also path the way for practical deployment of MMCs. Furthermore, various solution approaches proposed in this thesis can be applicable or generalized for solving a larger set of problems beyond the context of MMC.
Traintracks Through Calabi-Yaus: Amplitudes Beyond Elliptic Polylogarithms
Creators: name: Bourjaily, Jacob L.
name: He, Yang-Hui
name: McLeod, Andrew J.
name: von Hippel, Matt
name: Wilhelm, Matthias
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe a family of finite, four-dimensional, $L$-loop Feynman integrals that involve weight-$(L+1)$ hyperlogarithms integrated over $(L-1)$-dimensional elliptically fibered varieties we conjecture to be Calabi-Yau. At three loops, we identify the relevant K3 explicitly; and we provide strong evidence that the four-loop integral involves a Calabi-Yau threefold. These integrals are necessary for the representation of amplitudes in many theories---from massless $φ^4$ theory to integrable theories including maximally supersymmetric Yang-Mills theory in the planar limit---a fact we demonstrate.
description: 4+2 pages, 4 figures; references added
Reminiscences of Kathryn Sisson Phillips, 1962
Publisher: name: Columbia University
Year: 2021
Subjects: Women executives
Educators
Education--United States
Charitable uses, trusts, and foundations
Women--Education

description: Childhood in Kansas and Nebraska; Ohio Wesleyan; YWCA Secretary; early experiences as Dean of Women; formation of National Association of Deans of Women; educational opinions and theories; Phillips Foundation
Coupled 1D-3D simulation of flow in subway transit networks
Creators: name: Prince, Justin
Publisher: name: Imperial College London
Year: 2015

description: This thesis presents a 1D-3D coupled approach for tunnel ventilation modelling. A simplified 1D tunnel network model, based on the industry standard tool SES, is developed for testing coupling strategies. For a small tunnel network, air-flow rates are within 2% of those computed using SES. The open-source CFD code OpenFOAM is used to compute pressure losses within the developed coupling approach. Pressure loss calculations using the standard k − ε turbulence model are verified against the commercial code Star-CCM+ and validated against experimental data. In most cases the calculations are within the error bounds of the data. A Lagrange multiplier approach is used to treat defective flow-rate boundary conditions, which arise in multi-dimensional modelling. A novel implementation of this method within the finite-volume framework of OpenFOAM is constructed. The additional unknowns, introduced to the Navier-Stokes equations are solved within an adaption of the PISO solution, used by OpenFOAM. The velocity profiles produced using this method are in excellent agreement with the analytical solutions for laminar pipe flow. Furthermore, a first implementation of the Lagrange multiplier method with turbulence modelling incorporated shows that the approach is stable and accurate for simple and complex flow scenarios. A 1D-3D “hybrid” coupling strategy has been developed that can be implemented as a “black box” within the framework of the 1D aerodynamic model, and applicable to SES, by representing the CFD sections of the network as pressure losses. The proposed 1D-3D coupling strategy accurately reproduces full 3D simulations for the same scenario, and also reduces the simulation time. The tools developed in this work allow sophisticated methods to simulate the flow more accurately than 1D tools alone, whilst allowing for a large tunnel network to be modelled at a reasonable cost.
The Hard State of the Highly Absorbed High Inclination Black Hole Binary Candidate Swift J1658.2-4242 Observed by NuSTAR and Swift
Creators: name: Xu, Yanjun
name: Harrison, Fiona A.
name: Kennea, Jamie A.
name: Walton, Dominic J.
name: Tomsick, John A.
name: Miller, Jon M.
name: Barret, Didier
name: Fabian, Andrew C.
name: Forster, Karl
name: Fuerst, Felix
name: Gandhi, Poshak
name: Garcia, Javier A.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a spectral and timing analysis of the newly reported Galactic X-ray transient Swift J1658.2-4242 observed by NuSTAR and Swift. The broad-band X-ray continuum is typical of a black hole binary in the bright hard state, with a photon index of $Γ=1.63\pm0.02$ and a low coronal temperature of $kT_{\rm e}=22\pm1$ keV, corresponding to a low spectral cutoff well constrained by NuSTAR. Spectral modeling of the relativistic disk reflection features, consisting of a broad Fe K$α$ line and the Compton reflection hump, reveals that the black hole is rapidly spinning with the spin parameter of $a^{*}>0.96$, and the inner accretion disk is viewed at a high inclination angle of $i=64^{+2}_{-3}{^\circ}$ (statistical errors, 90% confidence). The high inclination is independently confirmed by dips in the light curves, which can be explained by absorbing material located near the disk plane temporarily obscuring the central region. In addition, we detect an absorption line in the NuSTAR spectra centered at $7.03^{+0.04}_{-0.03}$ keV. If associated with ionized Fe K absorption lines, this provides evidence for the presence of outflowing material in the low/hard state of a black hole binary candidate. A timing analysis shows the presence of a type-C QPO in the power spectrum, with the frequency increasing from $\sim0.14$ Hz to $\sim0.21$ Hz during the single NuSTAR exposure. Our analysis reveals that Swift J1658.2-4242 displays characteristics typical for a black hole binary that is viewed at a high inclination angle, making it a good system for studying the accretion geometry in black hole binaries.
description: 8 pages, 7 figures, accepted for publication in ApJ
SARGASSES
Creators: name: THIBAUT Thierry
Publisher: name: Sismer
Year: 2017

description: Série de campagne réalisée pour répondre aux questions soulevées par la prolifération des algues Sargasses dans l'Atlantique tropical nord, occasionnant des échouages massifs sur les côtes d'Amérique, d'Afrique et des Caraïbes depuis 2011. Objectif : échantillonnage des Sargasses, de la faune et de la flore associée aux radeaux de sargasses et mesure in situ des paramètres environnementaux.
Preprints and Open Peer Review
Creators: name: Galimberti, Paola
Publisher: name: Zenodo
Year: 2024
Subjects: preprint
open access
open peer review
peer review
open science
academic publishing

description: Open access began with preprints in the 1990s. Today, preprints remain a popular means of disseminating scientific results in certain disciplines. It also makes it possible to experiment with new ways of carrying out peer review and to build new publication models. The presentation was followed by an interview with Daniela Saderi, PhD in Neuroscience, co-founder and director at PREreview.

You can find Daniela Saderi's presentation here.

Duration: 1.5 hour

The recording of this webinar is available here.

Co-funded by the Erasmus+ Programme of the European Union