cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Algebre di Killing ad orbite tridimensionali
Creators: name: Piscopo, Rossella
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Nel presente lavoro sono classificate le algebre di campi di Killing ad orbite tridimensionali. Considerata la varietà pseudo-riemanniana (M,g) di dimensione n, è noto che l'algebra di Killing ha dimensione finita. Si è scoperto che tale dimensione è ulteriormente limitata dalla dimensione delle orbite. L'algebra Gk  campi di Killing ad orbite di dimensione r ha dimensione:
r ≤ dimGk ≤(1/2)r(r+1)
   In questo lavoro, fissata la dimensione delle orbite a 3, sono state classificate le algebre di Killing ad orbite tridimensionali, quando il tensore metrico g degenera sulle orbite.
Se il tensore metrico g si annulla, quando ristretto alle orbite dell'algebra, oltre alle strutture abeliane, per le algebre di dimensione 4 si è scoperta la seguente particolare struttura (Algebra di Rotondaro)
I4 = {e1, e2, e3, e4 :[ei , e j]=0, i,j =1,2,3, [e4,ei]=e i , i=1,2,3>
dove l'algebra derivata è l'unica sottoalgebra tridimensionale abeliana e in cui ogni sottospazio bidimensionale è una sottoalgebra.
    Nel caso in cui il tensore metrico ha rango 1 sulle orbite, la distribuzione ortogonale ha ulteriormente limitato la dimensione dell'algebra di Killing. Si è provato che la dimensione non può essere superiore a 4, se la distribuzione ortogonale non è integrabile e, in questo caso, le strutture trovate sono le stesse del caso precedente. Se, invece, la distribuzione ortogonale è integrabile, mediante identità polinomiali, sono state classificate, a meno di isomorfismi, cinque tipi di algebre di Killing di dimensione 4. Le algebre di dimensione 5 e 6 sono state classificate, in questo caso, grazie ad osservazioni geometriche e si è visto che queste sono somme semi-dirette di algebre tridimensionali note come so(2,1), con ideali bidimensionali e tridimensionali rispettivamente.
    Infine, quando il rango del tensore metrico è  2 sulle orbite, si è pervenuti ad una classificazione mediante la linearizzazione delle algebre isotrope. Il numero di strutture trovate è superiore a quello dei casi precedenti. Alcune delle strutture per le algebre di dimensione 4, si è visto, possono essere  somma diretta delle algebre semisemplici tridimensionali con un ideale unidimensionale oppure  somma semi-diretta dell'algebra delle isometrie infinitesimali del piano euclideo o di quello iperbolico-euclideo con un ideale unidimensionale. Per lo studio delle algebre di dimensione 5 e 6, oltre alla linearizzazione delle algebre isotrope, si è osservato che queste contengono una sottoalgebra di dimensione quattro e, quindi, si è fatto riferimento alla classificazione delle algebre di dimensione 4.
Un modello di degrado empirico-meccanicistico per la valutazione della irregolarità longitudinale nelle sovrastrutture stradali flessibili
Creators: name: Mattarocci, Marco
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Valutazione del degrado delle pavimentazioni stradali flessibili attraverso un modello di tipo empirico-meccanicistico.
Learning structure-aware semantic segmentation with image-level supervision
Creators: name: Liu, Jiawei
name: Zhang, Jing
name: Hong, Yicong
name: Barnes, Nick
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Compared with expensive pixel-wise annotations, image-level labels make it possible to learn semantic segmentation in a weakly-supervised manner. Within this pipeline, the class activation map (CAM) is obtained and further processed to serve as a pseudo label to train the semantic segmentation model in a fully-supervised manner. In this paper, we argue that the lost structure information in CAM limits its application in downstream semantic segmentation, leading to deteriorated predictions. Furthermore, the inconsistent class activation scores inside the same object contradicts the common sense that each region of the same object should belong to the same semantic category. To produce sharp prediction with structure information, we introduce an auxiliary semantic boundary detection module, which penalizes the deteriorated predictions. Furthermore, we adopt smoothness loss to encourage prediction inside the object to be consistent. Experimental results on the PASCAL-VOC dataset illustrate the effectiveness of the proposed solution.
Stable and oscillating solitons of $\mathcal{PT}$-symmetric couplers with gain and loss in fractional dimension
Creators: name: Zeng, Liangwei
name: Shi, Jincheng
name: Lu, Xiaowei
name: Cai, Yi
name: Zhu, Qifan
name: Chen, Hongyi
name: Long, Hu
name: Li, Jingzhen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Families of coupled solitons of $\mathcal{PT}$-symmetric physical models with gain and loss in fractional dimension and in settings with and without cross-interactions modulation (CIM), are reported. Profiles, powers, stability areas, and propagation dynamics of the obtained $\mathcal{PT}$-symmetric coupled solitons are investigated. By comparing the results of the models with and without CIM, we find that the stability area of the model with CIM is much broader than the one without CIM. Remarkably, oscillating $\mathcal{PT}$-symmetric coupled solitons can also exist in the model of CIM with the same coefficients of the self- and cross-interactions modulations. In addition, the period of these oscillating coupled solitons can be controlled by the linear coupling coefficient.
description: Published in Nonlinear Dynamics, 103(2), 1831-1840 (2021)
Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
Creators: name: Baugh, J.
name: Kitamura, Y.
name: Ono, K.
name: Tarucha, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the electrical induction and detection of dynamic nuclear polarization in the spin-blockade regime of double GaAs vertical quantum dots. The largest Overhauser field observed was about 4 Tesla, corresponding to a nuclear polarization of about 40% in the present device. A phenomenological model is presented to provide a qualitative understanding of our results.
description: 5 pages, 4 figures, rev-tex. Improved presentation of figures 1-3, also added SEM image to figure 1. Minor changes to discussion section, and added a concluding paragraph
Particle Acceleration and Magnetic Dissipation in Relativistic Current Sheet of Pair Plasmas
Creators: name: Zenitani, S.
name: Hoshino, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study linear and nonlinear development of relativistic and ultrarelativistic current sheets of pair plasmas with antiparallel magnetic fields. Two types of two-dimensional problems are investigated by particle-in-cell simulations. First, we present the development of relativistic magnetic reconnection, whose outflow speed is an order of the light speed c. It is demonstrated that particles are strongly accelerated in and around the reconnection region, and that most of magnetic energy is converted into "nonthermal" part of plasma kinetic energy. Second, we present another two-dimensional problem of a current sheet in a cross-field plane. In this case, the relativistic drift kink instability (RDKI) occurs. Particle acceleration also takes place, but the RDKI fast dissipates the magnetic energy into plasma heat. We discuss the mechanism of particle acceleration and the theory of the RDKI in detail. It is important that properties of these two processes are similar in the relativistic regime of T > mc^2, as long as we consider the kinetics. Comparison of the two processes indicates that magnetic dissipation by the RDKI is more favorable process in the relativistic current sheet. Therefore the striped pulsar wind scenario should be reconsidered by the RDKI.
description: To appear in ApJ vol. 670; 60 pages, 27 figures; References and typos are fixed
Nonequilibrium Time Reversibility with Maps and Walks
Creators: name: Hoover, William Graham
name: Hoover, Carol Griswold
name: Smith, Edward R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Time-reversible dynamical simulations of nonequilibrium systems exemplify both Loschmidt's and Zermélo's paradoxes. That is, computational time-reversible simulations invariably produce solutions consistent with the {\it irreversible} Second Law of Thermodynamics (Loschmidt's) as well as {\it periodic} in the time (Zermélo's, illustrating Poincaré recurrence). Understanding these paradoxical aspects of time-reversible systems is enhanced here by studying the simplest pair of such model systems. The first is time-reversible, but nevertheless dissipative and periodic, the piecewise-linear compressible Baker Map. The fractal properties of that two-dimensional map are mirrored by an even simpler example, the one-dimensional random walk, confined to the unit interval. As a further puzzle the two models yield ambiguities in determining the fractals' information dimensions. These puzzles, including the classical paradoxes, are reviewed and explored here. We review our investigations presented in Budapest in 1997 and end with presentday questions posed as the Snook Prize Problems in 2020 and 2021.
description: Eighteen pages with 11 Figures
Two HII/HI complexes in the outer galaxy
Creators: name: Wall, William Frank
Publisher: name: University of British Columbia
Year: 2010

description: The HII regions S211 and S212 have been observed at 1420MHz, in both line and continuum, using the synthesis telescope at the Dominion Radio Astrophysical Observatory. S211 and S212 and their associated atomic hydrogen were studied as part of an ongoing investigation of HII/HI complexes within molecular clouds. S211 and S212 both require a flux of ionizing photons consistent with the ultraviolet emission from an 06V star. S211 was barely resolved (1.6 beam widths) and was thus modelled with a constant density model with density 85cm⁻³. S212 was modelled with linear density gradients and a central density of 50 cm⁻³. S212 is probably density bounded towards the east and south. There is evidence for S212 and indirect evidence for S211 to suggest that both HII regions contain unresolved clumps of enhanced density. This would imply young ages (< 10⁵ yrs) for both HII regions. S211 was found to have 4000 M© of associated HI, roughly hemispherical in shape and extending 20 pc from the major ionizing star of S211. S212 possesses 1200 M© of atomic hydrogen which reaches an extent of 20 pc from its major ionizing star. Neither HI region would easily conform to a steady state photodissociation model assuming uniform hydrogen density. This is undoubtedly due to the young age of the HII regions as well as to a gradient in the gas density.
Dinamiche istituzionali e assetti socio-politici nello scenario evolutivo del Mediterraneo in termini di prospettive euro-mediterranee
Creators: name: Bonamassa, Serena
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Il Mediterraneo, quale protagonista della scena internazionale, è analizzato attraverso una prospettiva integrata geoeconomica/geopolitica con l'obiettivo di comprendere i futuri sviluppi.
Attraverso l'analisi delle tre forme- culturale, economica e politica- emerge la complessità e la modernità dell'area.
Il bacino del Mediterraneo richiama infatti fortemente l’attenzione sia per il ruolo di connessione tra il mercato atlantico e nord europeo da un lato, e quello asiatico e africano dall’altro, sia per le complesse vicende che caratterizzano gli assetti conflittuali ed in particolar modo la costruzione di un dialogo euro-Mediterraneo.
Dinamiche economiche e assetti socio politici che si intrecciano costantemente e che prefigurano uno scenario in continua evoluzione.
Towards a gauge invariant volume-weighted probability measure for eternal inflation
Creators: name: Linde, Andrei
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An improved volume-weighted probability measure for eternal inflation is proposed. For the models studied in this paper it leads to simple and intuitively expected gauge-invariant results.
description: 16 pages, 3 figs, few misprints corrected, comments added
Sistema Beta-adrenergico ed asse Renina-Angiotensina-Aldosterone nell’invecchiamento cardiovascolare
Creators: name: Golino, Luca
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: La disfunzione età-correlata dei βARs a livello cardiaco e vascolare rappresenta un fenomeno reversibile e che interventi sia di natura farmacologica che non farmacologica, come i β-bloccanti e l’esercizio fisico, possono indurre un significativo miglioramento del signaling a livello recettoriale e post-recettoriale. Ciò aggiunge nuove informazioni sui meccanismi molecolari attraverso i quali queste due strategie d’intervento esercitano i loro effetti favorevoli nel trattamento delle patologie cardiovascolari nella popolazione geriatrica.
L’invecchiamento si associa alla disregolazione di molti sistemi ormonali e il RAAS non fa eccezione a questo comportamento. Tuttavia, esistono ancora numerose lacune tra le conoscenze attualmente disponibili sulle specifiche interazioni tra RAAS sistemico e RAAS tissutali e sul significato della depressione del sistema ormonale circolante e sull’attivazione, invece, dei sistemi tissutali cardiaco e renale tubulo-interstiziale. Tali contraddizioni si accentuano ulteriormente laddove si consideri che la somministrazione di farmaci bloccanti il RAAS sia in grado anche nell’anziano ed in presenza di un RAAS sistemico depresso, di rallentare il danno d’organo renale e determinare un reverse-remodeling ventricolare sinistro.
Fundamental Strings, Holography, and Nonlinear Superconformal Algebras
Creators: name: Kraus, Per
name: Larsen, Finn
name: Shah, Akhil
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss aspects of holography in the AdS_3 \times S^p near string geometry of a collection of straight fundamental heterotic strings. We use anomalies and symmetries to determine general features of the dual CFT. The symmetries suggest the appearance of nonlinear superconformal algebras, and we show how these arise in the framework of holographic renormalization methods. The nonlinear algebras imply intricate formulas for the central charge, and we show that in the bulk these correspond to an infinite series of quantum gravity corrections. We also makes some comments on the worldsheet sigma-model for strings on AdS_3\times S^2, which is the holographic dual geometry of parallel heterotic strings in five dimensions.
description: 25 pages
Columnar magnetic structure coupled with orthorhombic distortion in the antiferromagnetic iron arsenide SrFe$_2$As$_2$
Creators: name: Kaneko, K.
name: Hoser, A.
name: Caroca-Canales, N.
name: Jesche, A.
name: Krellner, C.
name: Stockert, O.
name: Geibel, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Neutron powder diffraction experiments were carried out on polycrystalline SrFe$_2$As$_2$ in order to determine the magnetic structure and its relationship with the crystallographic one. Below $T_0$=205 K, magnetic reflections appear simultaneously with the onset of the orthorhombic distortion. From a detailed Rietveld analysis, the magnetic propagation vector of SrFe$_2$As$_2$ is determined to be {\textit{\textbf{q}}}=(1 0 1); the coupling of Fe moments is antiferromagnetic along the longer $a$ direction within the Fe-As layer, and the interlayer coupling is antiferromagnetic as well. The size of the Fe magnetic moment is deduced to be 1.01(3) $μ_{\rm B}$ with an orientation parallel to the a-axis. The temperature dependence of the magnetic moment shows excellent agreement with not only that of the muon precession frequency but also with that of the structural distortion, revealing the strong coupling of the columnar magnetic order and the structural distortion in SrFe$_2$As$_2$.
description: 12 pages, 4 figures
Gli spazi di relazione delle città del Mediterraneo
Creators: name: Zumbo, Luigi
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: La ricerca proposta si muove su diversi piani, ciascuno dei quali necessario per giungere ad una attenta qualificazione delle modalità nuove di funzionamento  che gli spazi di relazione dovrebbero avere nella città del Mediterraneo. La considerazione di partenza è che lo studio dei fenomeni spaziali e organizzativi degli spazi di relazione ed in particolare quelli storici può essere considerato un passo obbligato per la comprensione della città mediterranea per proiettarsi verso progettazioni consapevoli dei significati e delle identità. La riflessione sulle città del Mediterraneo e sulla valenza del concetto di spazio di relazione diventano elementi portanti della struttura della ricerca a supporto della tesi proposta. Ossia che la città del Mediterraneo riconosciuta come luogo di scambio e incontro, si trova ad essere luogo di crisi e di conflitto ma anche luogo delle opportunità e che tali opportunità avviano processi di salvaguardia dell’identità attraverso interventi di riqualificazione urbana con esiti di natura culturale, economica e sociale.
On the finiteness of the noncommutative supersymmetric Maxwell-Chern-Simons theory
Creators: name: Ferrari, A. F.
name: Gomes, M.
name: Nascimento, J. R.
name: Petrov, A. Yu.
name: da Silva, A. J.
name: Silva, E. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Within the superfield approach, we prove the absence of UV/IR mixing in the three-dimensional noncommutative supersymmetric Maxwell-Chern-Simons theory at any loop order and demonstrate its finiteness in one, three and higher loop orders.
description: 9 pages, 2 figures, revtex4
Integrated Natural Hazard Risk Management Course Brochure
Creators: name: Maier, Holger
Publisher: name: The University of Adelaide
Year: 2021
Subjects: subject: 90702 Environmental Engineering Modelling
subject: FOS: Environmental engineering

description: This document provides information on a 2-week Integrated Natural Hazard Risk Management Course at the University of Adelaide, Australia. The course is open to anyone and can be done remotely.
Magnetic Nanohorns for measurement of the interfacial Dzyaloshinskii-Moriya interaction: A micromagnetic study
Creators: name: Wong, Thomas
name: Sokalski, Vincent
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We evaluate the micromagnetic energy of a domain wall contained in a thin, horn-shaped nanostructure and propose a method to extract the strength of the interfacial Dzyaloshinskii-Moriya interaction based on the equilibrium position of the wall. An inplane magnetic field coupled with the interfacial DMI balances a competing driving force related to the "nanohorn" tapering and consequent variation in length. It is evident that the strength of the the DMI is directly correlated to the equilibrium position of the DW. Moreover, the range of measurable DMI values can be controlled by varying the degree of tapering in the nanohorn. Numerical and semi-analytical calculations were separately performed and show broad agreement. The calculations provided here offer an alternative framework for future measurement of DMI, which has been notoriously difficult to do experimentally.
description: 3 pages, 3 figures, submitted to IEEE Transactions on Magnetics
Alpha-Alpha scattering, chiral symmetry and 8Be lifetime
Creators: name: Arriola, E. Ruiz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Alpha-alpha scattering is discussed in terms of a chiral two pion exchange potential which turns out to be attractive and singular at the origin, hence demanding renormalization. When 8Be is treated as a resonance state a model independent correlation between the Q-factor and lifetime 1/Gamma for the decay into two alpha particles arises. For a wide range of parameters compatible with potential model analyses of low energy pi-alpha scattering it is found Gamma = 4.4(4)eV} in fairly good agreement with the experimental value Gamma = 5.57 (25) eV. The remaining discrepancy as well as the phase shift up to ELAB=15MeV could be accommodated by the leading nuclear peripheral contributions due to the 3H+p and 3He+n continuum.
description: presented by at SCADRON 70 ``Scalar Mesons and Related Topics, Lisbon, 11-16 February 2008, 6 pages
Measurement of harmonics in a underdense CO₂ laser produced plasma
Creators: name: Zhu, Yueqiang
Publisher: name: University of British Columbia
Year: 2010

description: Second harmonic(2ω₀) and three halves harmonic(3/2ω₀) are studied in the interaction of CO₂ laser of frequency ω₀, with an underdense plasma. It is shown theoretically that filamentation can lead to sizable second harmonic generation. The 2ω₀-radiation is emitted into a forward directed cone, its angle determined by the wavelength of the fundamental radiation in the plasma filament. Experimental observations confirm the theoretical predications. Aside from the forward directed emission cone, non negligable 2ω₀ power is detected over a broad angular range in the backward direction showing a broadened red shifted spectrum. The dependence of the backward emitted 2ω₀-radiation on the plasma density, and the red shifted spectrum strongly support the argument that the backward emitted 2ω₀-radiation is related to the SBS(Stimulated Brillouin scattering) instability. Based on the wave vector matching conditions, the angular distribution of 3/2ω₀-radiation is predicted. The experimental results confirm the prediction. It is shown experimentally that the fusion of three plasma waves produced in the TPD(Two Plasma Decay) instability dominates the generation of 3/2ω₀-radiation when the incident beam energy is high.
TOVARLARNI TIF TN BO'YICHA TASNIFLASHDA MILLIY VA XALQARO HUQUQIY ASOSLAR
Creators: name: Quvatova, Zaxro
Publisher: name: Zenodo
Year: 2023

description: Maqolada tovarlarni tashqi iqtisodiy faoliyat tovarlar nomenklaturasi bo’yicha tasniflashning milliy va xalqaro asoslari to’g’risida ma’lumotlar ko’rib chiqilgan. Shuningdek, O’zbekiston Respublikasi tashqi iqtisodiy faoliyat tovarlar nomenklaturasiga kiritilgan o’zgarishlar keltirilgan.
Group-quantization of non-linear sigma models: particle on S^2 revisited
Creators: name: Aldaya, V.
name: Calixto, M.
name: Guerrero, J.
name: López-Ruiz, F. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the quantum mechanics of "partial-trace" non-linear sigma models, on the grounds of a fully symmetry-based procedure. After the general scheme is sketched, the particular example of a particle on the two-sphere is explicitly developed. As a remarkable feature, no explicit constraint treatment is required nor ordering ambiguities do appear. Moreover, the energy spectrum is recovered without extra terms in the curvature of the sphere.
description: 8 pages
Gutzwiller-projected states for the $J_1$-$J_2$ Heisenberg model on the kagome lattice: achievements and pitfalls
Creators: name: Iqbal, Yasir
name: Ferrari, Francesco
name: Chauhan, Aishwarya
name: Parola, Alberto
name: Poilblanc, Didier
name: Becca, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We assess the ground-state phase diagram of the $J_1$-$J_2$ Heisenberg model on the kagome lattice by employing Gutzwiller-projected fermionic wave functions. Within this framework, different states can be represented, defined by distinct unprojected fermionic Hamiltonians that include hopping and pairing terms, as well as a coupling to local Zeeman fields to generate magnetic order. For $J_2=0$, the so-called U(1) Dirac state, in which only hopping is present (such as to generate a $π$-flux in the hexagons), has been shown to accurately describe the exact ground state [Y. Iqbal, F. Becca, S. Sorella, and D. Poilblanc, Phys. Rev. B 87, 060405 (2013); Y.-C. He, M. P. Zaletel, M. Oshikawa, and F. Pollmann, Phys. Rev. X 7, 031020 (2017)]. Here, we show that its accuracy improves in presence of a small antiferromagnetic super-exchange $J_2$, leading to a finite region where the gapless spin liquid is stable; then, for $J_2/J_1=0.11(1)$, a first-order transition to a magnetic phase with pitch vector ${\bf q}=(0,0)$ is detected, by allowing magnetic order within the fermionic Hamiltonian. Instead, for small ferromagnetic values of $|J_2|/J_1$, the situation is more contradictory. While the U(1) Dirac state remains stable against several perturbations in the fermionic part (i.e., dimerization patterns or chiral terms), its accuracy clearly deteriorates on small systems, most notably on $36$ sites where exact diagonalization is possible. Then, upon increasing the ratio $|J_2|/J_1$, a magnetically ordered state with $\sqrt{3} \times \sqrt{3}$ periodicity eventually overcomes the U(1) Dirac spin liquid. Within the ferromagnetic $J_{2}$ regime, evidence is shown in favor of a first-order transition at $J_2/J_1=-0.065(5)$.
description: 9 pages, 6 figures, 1 table
Compactification in first order gravity
Creators: name: Aros, Rodrigo
name: Romo, Mauricio
name: Zamorano, Nelson
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Kaluza-Klein compactification process is applied in five dimensions to CS gravity, for the anti-de Sitter and Poincaré groups, using the first order formalism. In this context some solutions are found and analyzed. Also, the conserved charges associated to the solutions are computed.
description: Minor corrections
Rodriguez et al., 2024 eDNA Extraction Ring Test Sanger Sequence Data
Creators: name: Rodriguez, Lauren
name: De Bonis, Lorenzo
name: McKee, Jack
name: McKenna, James
name: Urvois, Teddy
name: Barbaccia, Eleonora
name: Dillane, Eileen
name: Lanfredi, Caterina
name: Hjellnes, Helene
name: Jung, Armelle
name: Villa, Enrico
name: Azzellino, Arianna
name: Westgaard, Jon-Ivar
name: Quéméré, Erwan
name: Thalinger, Bettina
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 310902
subject: Animal cell and molecular biology
classificationCode: 310509
subject: Genomics

description: This dataset is supplemental to the manuscript titled "Inter-laboratory ring test for environmental DNA extraction protocols: implications for marine megafauna detection using three novel qPCR assays". The file contains Sanger sequencing results in FASTA format from environmental DNA (eDNA) samples that were collected, amplified, and sequenced as part of a study aimed at detecting marine megafauna species using qPCR. The samples were processed at multiple institutions, following various protocols described below.Methodology OverviewqPCR Amplification and Purification: At multiple institutions (University of Innsbruck - UIBK, National Research Institute for Agriculture, Food, and the Environment - INRAE, University College Cork - UCC, and Institute of Marine Research - IMR), target species DNA from eDNA samples was amplified using qPCR, with positive amplifications subsequently purified using a variety of protocols: UIBK and IMR used ExoSAP-IT® for enzymatic cleanup (Affymetrix-USB Corporation). UCC used the QIAquick Gel Extraction Kit (Qiagen). INRAE re-amplified positive qPCR amplifications via conventional PCR then used the NucleoSpin Gel and PCR Clean-up kit (Macherey-Nagel).Sanger Sequencing: Following purification, purified (q)PCR products were sequenced using Sanger sequencing. For samples from UIBK and UCC, sequencing was conducted by Eurofins Genomics (Germany). For samples from INRAE, GenoScreen (France) performed the sequencing. IMR utilized the BigDye™ Terminator v3.1 Cycle Sequencing Kit (Applied Biosystems™) on their samples then sent products to the University of North Norway (Norway) performed sequencing.Sequence Processing: Low quality regions were identified and removed from the raw sequences using Bioedit 7.7, AliView 1.28, Geneious 7.1.9, and UGENE 50.0. Final sequence data were subjected to BLAST analysis (NCBI) for taxonomic classification, verifying matches to the target species.Data DetailsFile Type: FASTA (.fas)Contents: Verified DNA sequences of target species from Sanger sequencing, following purification and amplification via qPCR.Software Used: Bioedit, AliView, Geneious, UGENE for sequence trimming; BLAST (NCBI) for taxonomic identification.Purpose of the DataThese sequences confirm the presence of each target species in the environmental DNA samples - verified through qPCR and validated by Sanger sequencing. The dataset provides a key resource for further taxonomic and ecological studies involving species detection in marine environments using eDNA methods.
Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures
Creators: name: Schultheiss, H.
name: Sandweg, C. W.
name: Obry, B.
name: Hermsdoerfer, S. J.
name: Schaefer, S.
name: Leven, B.
name: Hillebrands, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The spatial profiles and the dissipation characteristics of spin-wave quasi-eigenmodes are investigated in small magnetic Ni$_{81}$Fe$_{19}$ ring structures using Brillouin light scattering microscopy. It is found, that the decay constant of a mode decreases with increasing mode frequency. Indications for a contribution of three-magnon processes to the dissipation of higher-order spin-wave quasi-eigenmodes are found.
title: An Investigation into Experiences and Perceptions of School Performance Evaluation (SPE) in Secondary Schools in Saudi Arabia
Creators: name: Alsubaie, Azzah
Publisher: name: University of Reading
Year: 2020

description: School performance evaluation (SPE) and the use of performance indicators is one of the most common educational reforms sweeping the globe as a consequence of neoliberalism and increased managerialism in education (Ball, 2012a). Like many countries, Saudi Arabia has implemented SPE to improve educational outcomes. The School Performance Indicators System (SPIS) is the most recent programme, but not the first (Al Hakamy, 2008). It was preceded by many other SPE programmes, some of which operated concurrently. Although SPE has generated widespread global debate and is known to cause increased workload and emotional strain on teachers and head teachers (Perryman, Ball, Maguire, & Braun, 2011), there is a dearth of empirical research into teachers and head teachers experiences of SPE in Saudi Arabia. This study is aimed at contributing to closing that gap. Giving a voice to an underrepresented group in research by focusing on female teachers and school head teachers, specifically, the aim of this study is to explore how they make sense of and experience SPIS monitoring and inspection visits, as well as their views of SPIS key performance indicators (KPIs) and accountability within the system. In addition, the study explores the effects of SPE on their stress levels, workload and morale. The data collection and analysis are embedded in an interpretivist paradigm, using explanatory sequential multi-site case study mixed methods. This consisted of administering a questionnaire to 64 female head teachers and 109 female secondary school teachers in Jeddah. These data were then enriched by conducting interviews with three female head teachers and nine female teachers from three schools to gather more in-depth views of SPIS. The conceptual framework for this study centres upon three main concepts, which are discussed in depth: SPE, performativity and accountability. The results of this study point to the importance of teachers and head teachers participating in the design and implementation of new programmes, aimed at education reform. The study reveals the impact of centralisation on the reduced efficiency of SPE implementation, which casts doubt over the efficacy of such education reforms.
Equilibrium tuned by a magnetic field in phase separated manganite
Creators: name: Quintero, M.
name: Parisi, F.
name: Leyva, G.
name: Ghivelder, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present magnetic and transport measurements on La5/8-yPryCa3/8MnO3 with y = 0.3, a manganite compound exhibiting intrinsic multiphase coexistence of sub-micrometric ferromagnetic and antiferromagnetic charge ordered regions. Time relaxation effects between 60 and 120K, and the obtained magnetic and resistive viscosities, unveils the dynamic nature of the phase separated state. An experimental procedure based on the derivative of the time relaxation after the application and removal of a magnetic field enables the determination of the otherwise unreachable equilibrium state of the phase separated system. With this procedure the equilibrium phase fraction for zero field as a function of temperature is obtained. The presented results allow a correlation between the distance of the system to the equilibrium state and its relaxation behavior.
description: 13 pages, 5 figures. Submited to Journal of Physics: Condensed Matter
Realistic Finite-Temperature Effects in Neutron Star Merger Simulations
Creators: name: Raithel, Carolyn
name: Paschalidis, Vasileios
name: Özel, Feryal
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Binary neutron star mergers provide a unique probe of the dense-matter equation of state (EoS) across a wide range of parameter space, from the zero-temperature EoS during the inspiral to the high-temperature EoS following the merger. In this paper, we implement a new model for calculating parametrized finite-temperature EoS effects into numerical relativity simulations. This "M* model" is based on a two-parameter approximation of the particle effective mass and includes the leading-order effects of degeneracy in the thermal pressure and energy. We test our numerical implementation by performing evolutions of rotating single stars with zero- and non-zero temperature gradients, as well as evolutions of binary neutron star mergers. We find that our new finite-temperature EoS implementation can support stable stars over many dynamical timescales. We also perform a first parameter study to explore the role of the M* parameters in binary neutron star merger simulations. All simulations start from identical initial data with identical cold EoSs, and differ only in the thermal part of the EoS. We find that both the thermal profile of the remnant and the post-merger gravitational wave signal depend on the choice of M* parameters, but that the total merger ejecta depends only weakly on the finite-temperature part of the EoS across a wide range of parameters. Our simulations provide a first step toward understanding how the finite-temperature properties of dense matter may affect future observations of binary neutron star mergers.
SOP for EI source maintenance for GC Q – Exactive
Creators: name: Biomarker Analytical Laboratories
Publisher: name: Zenodo
Year: 2021
Subjects: EI source maintenance; GC Q – Exactive

description: This section describes EI source maintenance, removing ion source cartridge form GC Q – Exactive, cleaning procedure for EI source components (Ion Cartridge Sleeve, Lens 3/RF Lens, Lens 2, Lens 1, Ion Volume, Repeller, Ion Volume – Repeller Insulator, Repeller, Ion Volume – Repeller Insulator, Repeller Nut, Repeller Spring, Ion Volume Locking Ring).
description: Research Infrastructure RECETOX RI (No LM2018121) financed by the Ministry of Education, Youth and Sports, and Operational Programme Research, Development and Innovation - project CETOCOEN EXCELLENCE (No CZ.02.1.01/0.0/0.0/17_043/0009632).
Langevin Dynamics of the vortex matter two-stage melting transition in Bi_2Sr_2CaCu_2O$_{8+δ}$ in the presence of straight and of tilted columnar defects
Creators: name: Goldschmidt, Yadin Y.
name: Liu, Jin-Tao
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this paper we use London Langevin molecular dynamics simulations to investigate the vortex matter melting transition in the highly anisotropic high-temperature superconductor material Bi_2Sr_2CaCu_2O$_{8+δ}$ in the presence of low concentration of columnar defects (CDs). We reproduce with further details our previous results obtained by using Multilevel Monte Carlo simulations that showed that the melting of the nanocrystalline vortex matter occurs in two stages: a first stage melting into nanoliquid vortex matter and a second stage delocalization transition into a homogeneous liquid. Furthermore, we report on new dynamical measurements in the presence of a current that identifies clearly the irreversibility line and the second stage delocalization transition. In addition to CDs aligned along the c-axis we also simulate the case of tilted CDs which are aligned at an angle with respect to the applied magnetic field. Results for CDs tilted by $45^{\circ}$ with respect to c-axis show that the locations of the melting and delocalization transitions are not affected by the tilt when the ratio of flux lines to CDs remains constant. On the other hand we argue that some dynamical properties and in particular the position of the irreversibility line should be affected.
description: 13 pages, 11 figures
Multiple M2-branes and the Embedding Tensor
Creators: name: Bergshoeff, Eric A.
name: de Roo, Mees
name: Hohm, Olaf
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the Bagger-Lambert theory of multiple M2-branes fits into the general construction of maximally supersymmetric gauge theories using the embedding tensor technique. We apply the embedding tensor technique in order to systematically obtain the consistent gaugings of N=8 superconformal theories in 2+1 dimensions. This leads to the Bagger-Lambert theory, with the embedding tensor playing the role of the four-index antisymmetric tensor defining a ``3-algebra''. We present an alternative formulation of the theory in which the embedding tensor is replaced by a set of unrestricted scalar fields. By taking these scalar fields to be parity-odd, the Chern-Simons term can be made parity-invariant.
description: 11 pages, v2: references and discussion about G2 gauging added
Emergent gravity and the quantum
Creators: name: Das, Saurya
name: Sur, Sourav
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that if one starts with a Universe with some matter and a cosmological constant, then quantum mechanics naturally induces an attractive gravitational potential and an effective Newton's coupling. Thus gravity is an emergent phenomenon and what should be quantized are the fundamental degrees of freedom from which it emerges.
description: This essay received an Honorable Mention in the 2021 Gravity Research Foundation Essay Competition
Morphological and Kinematical Analysis of the Double-barred Galaxy NGC 3504 Using ALMA CO (2-1) Data
Creators: name: Wu, Yu-Ting
name: Trejo, Alfonso
name: Espada, Daniel
name: Miyamoto, Yusuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present results obtained from ALMA CO (2-1) data of the double-barred galaxy NGC 3504. With three times higher angular resolution (~ 0."8) than previous studies, our observations reveal an inner molecular gas bar, a nuclear ring, and four inner spiral arm-like structures in the central 1 kpc region. Furthermore, the CO emission is clearly aligned with the two dust lanes in the outer bar region, with differences in shape and intensity between them. The total molecular gas mass in the observed region (50"x57") is estimated to be $\sim 3.1\times 10^9 \, {\rm M}_{\odot}$, which is 17 per cent of the stellar mass. We used the Kinemetry package to fit the velocity field and found that circular motion strongly dominates at $R= 0.3-0.8$ kpc, but radial motion becomes important at $R<0.3$ kpc and $R=1.0-2.5$ kpc, which is expected due to the presence of the inner and outer bars. Finally, assuming that the gas moves along the dust lanes in the bar rotating frame, we derived the pattern speed of the outer bar to be $ 18\pm5$ km s$^{-1}$ kpc$^{-1}$, the average streaming velocities on each of the two dust lanes to be 165 and 221 km s$^{-1}$, and the total mass inflow rate along the dust lanes to be 12 M$_{\odot}$ yr$^{-1}$. Our results give a new example of an inner gas bar within a gas-rich double-barred galaxy and suggest that the formation of double-barred galaxies could be associated with the existence of such gas structures.
description: Accepted for publication in MNRAS, 18 pages, 18 figures, 1 table
X-ray processes in high-intensity laser-matter interactions
Creators: name: Adams, Frederick P.
Publisher: name: University of British Columbia
Year: 2010

description: In laser-matter-interaction studies there is a continued interest in the emission and transport of x-rays in laser-irradiated solids. We have irradiated metal foil targets with 0.532 μm laser light with pulse lengths of 2.4 to 2.6 us at absorbed irradiances of 10¹² to 10¹³ W/cm . Calorimetric measurements of the energy of x-ray emission by the laser-produced plasma on the target frontside indicate that copper is a better emitter than aluminum or molybdenum in an x-ray band ≥ 800 eV. Measurements comparing x-ray transmission through irradiated foil targets with that through identical, unperturbed filters indicate enhanced transmission of x-ray energy through the targets. Temporally-resolved measurements on aluminum targets show that x-ray transmission through the target is strongly time-dependent, with x-ray power transmission through the targets, with the greatest contribution being that resulting from 2D rarefaction of the target after shock breakout. This corroborates earlier observations of delayed x-ray heating of the target rear surface. Enhanced transmission of x-rays through the targets at the moment of shock breakout was also observed, consistent with a shift of the K-shell x-ray absorption edge in the shocked aluminum plasma allowing increased transmission of the aluminum He[sub α] and IC x-ray lines. Other models which may yield similar enhanced x-ray transmission are investigated and rejected on the basis of experimental measurements on layered targets composed of an aluminum substrate and a copper layer as an x-ray source. Similar enhanced x-ray transmission has also been observed in laser-irradiated magnesium targets. The results provide the first experimental evidence of substantial increase in x-ray transport due to a shift of the K-shell photoabsorption edge induced by shock-compression of a dense plasma.
Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample VII: the Stellar Disk Structure Revealed by the Mono-abundance Populations
Creators: name: Yu, Zheng
name: Li, Ji
name: Chen, Bingqiu
name: Huang, Yang
name: jia, Shuhua
name: Xiang, Maosheng
name: Yuan, Haibo
name: Shi, Jianrong
name: Wang, Chun
name: Liu, Xiaowei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using a sample of 96,201 primary red clump (RC) stars selected from the LAMOST and Gaia surveys, we investigate the stellar structure of the Galactic disk. The sample stars show two separated sequences of high-[α/Fe] and low-[α/Fe] in the [α/Fe]-[Fe/H] plane. We divide the sample stars into five mono-abundance populations (MAPs) with different ranges of [α/Fe] and [Fe/H], named as the high-[α/Fe], high-[α/Fe] & high-[Fe/H], low-[Fe/H], solar, high-[Fe/H] MAPs respectively. We present the stellar number density distributions in the R R Z plane, and the scale heights and scale lengths of the individual MAPs by fitting their vertical and radial density profiles. The vertical profiles, the variation trend of scale height with the Galactocentric radius, indicate that there is a clear disk flare in the outer disk both for the low-[α/Fe] and the high-[α/Fe] MAPs. While the radial surface density profiles show a peak radius of 7 kpc and 8 kpc for the high-[α/Fe] and low-[α/Fe] MAPs, respectively. We also investigate the correlation between the mean rotation velocity and metallicity of the individual MAPs, and find that the mean rotation velocities are well separated and show different trends between the high-[α/Fe] and the low-[α/Fe] MAPs. At last, we discuss the character of the high-[α/Fe] & high-[Fe/H] MAP and find that it is more similar to the high-[α/Fe] MAP either in the radial and vertical density profiles or in the rotation velocity.
description: 16 pages,12 figures
Testing the accuracy of the overlap criterion
Creators: name: Mestre, M. F.
name: Cincotta, P. M.
name: Giordano, C. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Here we investigate the accuracy of the overlap criterion when applied to a simple near-integrable model in both its 2D and 3D version. To this end, we consider respectively, two and three quartic oscillators as the unperturbed system, and couple the degrees of freedom by a cubic, non-integrable perturbation. For both systems we compute the unperturbed resonances up to order O(ε^2), and model each resonance by means of the pendulum approximation in order to estimate the theoretical critical value of the perturbation parameter for a global transition to chaos. We perform several surface of sections for the bidimensional case to derive an empirical value to be compared to our theoretical estimation, being both in good agreement. Also for the 3D case a numerical estimate is attained that we observe matches the critical value resulting from theoretical means. This confirms once again that reckoning resonances up to O(ε^2) suffices in order the overlap criterion to work out. Keywords: {Chaos -- Resonances -- Theoretical and Numerical Methods}
description: 16 pages