cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The self-assembly of DNA Holliday junctions studied with a minimal model
Creators: name: Ouldridge, Thomas E.
name: Johnston, Iain G.
name: Louis, Ard A.
name: Doye, Jonathan P. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: In this paper, we explore the feasibility of using coarse-grained models to simulate the self-assembly of DNA nanostructures. We introduce a simple model of DNA where each nucleotide is represented by two interaction sites corresponding to the phosphate-sugar backbone and the base. Using this model, we are able to simulate the self-assembly of both DNA duplexes and Holliday junctions from single-stranded DNA. We find that assembly is most successful in the temperature window below the melting temperatures of the target structure and above the melting temperature of misbonded aggregates. Furthermore, in the case of the Holliday junction, we show how a hierarchical assembly mechanism reduces the possibility of becoming trapped in misbonded configurations. The model is also able to reproduce the relative melting temperatures of different structures accurately, and allows strand displacement to occur.
description: 13 pages, 14 figures
Iron line profiles and self-shadowing from relativistic thick accretion discs
Creators: name: Wu, Sheng-Miao
name: Wang, Ting-Gui
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Fe Kalpha line profiles from and images of relativistic discs with finite thickness around a rotating black hole using a novel code. The line is thought to be produced by iron fluorescence of a relatively cold X-ray illuminated material in the innermost parts of the accretion disc and provides an excellent diagnostic of accretion flows in the vicinity of black holes. Previous studies have concentrated on the case of a thin, Keplerian accretion disc. This disc must become thicker and sub-Keplerian with increasing accretion rates. These can affect the line profiles and in turn can influence the estimation of the accretion disc and black hole parameters from the observed line profiles. We here embark on, for the first time, a fully relativistic computation which offers key insights into the effects of geometrical thickness and the sub-Keplerian orbital velocity on the line profiles. We include all relativistic effects such as frame-dragging, Doppler boost, time dilation, gravitational redshift and light bending. We find that the separation and the relative height between the blue and red peaks of the line profile diminish as the thickness of the disc increases. This code is also well-suited to produce accretion disc images. We calculate the redshift and flux images of the accretion disc and find that the observed image of the disc strongly depends on the inclination angle. The self-shadowing effect appears remarkable for a high inclination angle, and leads to the black hole shadow being completely hidden by the disc itself.
description: 11 pages, 11 figures, some typographical errors are corrected
Additional file 1 of Broadening Bandwidths of Few-Layer Absorbers by Superimposing Two High-Loss Resonators
Creators: name: Wu, Dong
name: Chen, Jianjun
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Neuroscience
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer

description: Additional file 1: Fig. S1. Simulated absorption for the metasurface absorbers consisting of MgF2/W/MgF2/W, MgF2/Ni/MgF2/Ni, and MgF2/Cr/MgF2/Cr layers, respectively.
Multiple operator integrals in non-separable von Neumann algebras
Creators: name: Nikitopoulos, Evangelos A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46G10, 47B49

description: A multiple operator integral (MOI) is an indispensable tool in several branches of noncommutative analysis. However, there are substantial technical issues with the existing literature on the "separation of variables" approach to defining MOIs, especially when the underlying Hilbert spaces are not separable. In this paper, we provide a detailed development of this approach in a very general setting that resolves existing technical issues. Along the way, we characterize several kinds of "weak" operator valued integrals in terms of easily checkable conditions and prove a useful Minkowski-type integral inequality for maps with values in a semifinite von Neumann algebra.
description: 48 pages. This version has been updated to match the published version, aside from the inclusion of proofs of Proposition 3.1.2, Proposition 3.2.5, and Lemma 3.4.2 (omitted from the published version); the correction of some typos; and the adjustment of some references
Definition of a time variable with Entropy of a perfect fluid in Canonical Quantum Gravity
Creators: name: Cianfrani, Francesco
name: Montani, Giovanni
name: Zonetti, Simone
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Brown-Kuchar mechanism is applied in the case of General Relativity coupled with the Schutz model for a perfect fluid. Using the canonical formalism and manipulating the set of modified constraints one is able to recover the definition of a time evolution operator, i.e. a physical Hamiltonian, expressed as a functional of gravitational variables and the entropy.
description: 13 pages, no figures. To be published in Classical and Quantum Gravity. v2: major changes
Higher derivatives of operator functions in ideals of von Neumann algebras
Creators: name: Nikitopoulos, Evangelos A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A55, 47A56, 47L20, 47B10

description: Let $\mathscr{M}$ be a von Neumann algebra and $a$ be a self-adjoint operator affiliated with $\mathscr{M}$. We define the notion of an "integral symmetrically normed ideal" of $\mathscr{M}$ and introduce a space $OC^{[k]}(\mathbb{R}) \subseteq C^k(\mathbb{R})$ of functions $\mathbb{R} \to \mathbb{C}$ such that the following result holds: for any integral symmetrically normed ideal $\mathscr{I}$ of $\mathscr{M}$ and any $f \in OC^{[k]}(\mathbb{R})$, the operator function $\mathscr{I}_{\mathrm{sa}} \ni b \mapsto f(a+b)-f(a) \in \mathscr{I}$ is $k$-times continuously Fréchet differentiable, and the formula for its derivatives may be written in terms of multiple operator integrals. Moreover, we prove that if $f \in \dot{B}_1^{1,\infty}(\mathbb{R}) \cap \dot{B}_1^{k,\infty}(\mathbb{R})$ and $f'$ is bounded, then $f \in OC^{[k]}(\mathbb{R})$. Finally, we prove that all of the following ideals are integral symmetrically normed: $\mathscr{M}$ itself, separable symmetrically normed ideals, Schatten $p$-ideals, the ideal of compact operators, and -- when $\mathscr{M}$ is semifinite -- ideals induced by fully symmetric spaces of measurable operators.
description: 43 pages. This version has been updated to match the published version, aside from the inclusion of a sketch of proof of Proposition 2.2.8 (omitted from the published version), the correction of some typos, and the adjustment of some references
Additional file 1 of Ranking cancer drivers via betweenness-based outlier detection and random walks
Creators: name: Cesim Erten
name: Aissa Houdjedj
name: Kazan, Hilal
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Supplementary materials (Supplementary Tables 1–7, Supplementary Figures 1–18).
Additional file 4 of Comparison of landiolol and amiodarone for the treatment of new-onset atrial fibrillation after cardiac surgery (FAAC) trial: study protocol for a randomized controlled trial
Creators: name: Caspersen, Edouard
name: Guinot, Pierre-Grégoire
name: Rozec, Bertrand
name: Oilleau, Jean-Ferréol
name: Fellahi, Jean-Luc
name: Gaudard, Philippe
name: Lorne, Emmanuel
name: Mahjoub, Yazine
name: Besnier, Emmanuel
name: Moussa, Mouhamed Djahoum
name: Mongardon, Nicolas
name: Hanouz, Jean-Luc
name: Briant, Anaïs R.
name: Paul, Laure Peyro Saint
name: Tomadesso, Clémence
name: Parienti, Jean-Jacques
name: Descamps, Richard
name: Denisenko, Alina
name: Fischer, Marc-Olivier
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: Mental Health

description: Additional file 4. Schematic diagram of study procedure.
Double-lined spectroscopic binaries in M11
Creators: name: Kovalev, Mikhail
name: Straumit, Ilya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have developed a new method for spectral analysis of binaries. Our method successfully identifies SB2 candidates from high-resolution Gaia-ESO spectra. Compared to the commonly used cross-correlation function analysis, it works for binaries with rapidly rotating components. We test our method on synthetic and observational spectra of BAFG-stars in the open cluster M 11. We confirm five previously detected SB2 candidates and find 19 new ones. For three SB2 candidates we find circular orbits and obtain dynamical mass ratios.
description: accepted in MNRAS 15.11.21
Modulated X-ray Emissivity near the Stress Edge in Sgr A*
Creators: name: Falanga, M.
name: Melia, F.
name: Prescher, M.
name: Belanger, G.
name: Goldwurm, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Sgr A* is thought to be the radiative manifestation of a ~3.6E6 Msun supermassive black hole at the Galactic center. Its mm/sub-mm spectrum and its flare emission at IR and X-ray wavelengths may be produced within the inner ten Schwarzschild radii of a hot, magnetized Keplerian flow. The lightcurve produced in this region may exhibit quasi-periodic variability. We present ray-tracing simulations to determine the general-relativistically modulated X-ray luminosity expected from plasma coupled magnetically to the rest of the disk as it spirals inwards below the innermost stable circular orbit towards the "stress edge" in the case of a Schwarzschild metric. The resulting lightcurve exhibits a modulation similar to that observed during a recent X-ray flare from Sgr A*.
description: 4 pages, 3 figures, accepted for publication in ApJL
Radio galaxies in galaxy groups: kinematics, scaling relations and AGN feedback
Creators: name: Pasini, T.
name: Finoguenov, A.
name: Brüggen, M.
name: Gaspari, M.
name: de Gasperin, F.
name: Gozaliasl, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the kinematic properties of a large (N=998) sample of COSMOS spectroscopic galaxy members distributed among 79 groups. We identify the Brightest Group Galaxies (BGGs) and cross-match our data with the VLA-COSMOS Deep survey at 1.4 GHz, classifying our parent sample into radio/non-radio BGGs and radio/non-radio satellites. The radio luminosity distribution spans from $L_R\sim2\times10^{21}$ W Hz$^{-1}$ to $L_R\sim3\times$10$^{25}$ W Hz$^{-1}$. A phase-space analysis, performed by comparing the velocity ratio (line-of-sight velocity divided by the group velocity dispersion) with the galaxy-group centre offset, reveals that BGGs (radio and non-radio) are mostly ($\sim$80\%) ancient infallers. Furthermore, the strongest ($L_R>10^{23}$ W Hz$^{-1}$) radio galaxies are always found within 0.2$R_{\rm vir}$ from the group centre. Comparing our samples with HORIZON-AGN, we find that the velocities and offsets of simulated galaxies are more similar to radio BGGs than to non-radio BGGs, albeit statistical tests still highlight significant differences between simulated and real objects. We find that radio BGGs are more likely to be hosted in high-mass groups. Finally, we observe correlations between the powers of BGG radio galaxies and the X-ray temperatures, $T_{\rm x}$, and X-ray luminosities, $L_{\rm x}$, of the host groups. This supports the existence of a link between the intragroup medium and the central radio source. The occurrence of powerful radio galaxies at group centres can be explained by Chaotic Cold Accretion, as the AGN can feed from both the galactic and intragroup condensation, leading to the observed positive $L_{\rm R}-T_{\rm x}$ correlation.
description: 11 pages, 8 figures
Binary sequences with length n and nonlinear complexity not less than n/2
Creators: name: Liang, Sicheng
name: Zeng, Xiangyong
name: Xiao, Zibi
name: Sun, Zhimin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, the construction of finite-length binary sequences whose nonlinear complexity is not less than half of the length is investigated. By characterizing the structure of the sequences, an algorithm is proposed to generate all binary sequences with length $n$ and nonlinear complexity $c_{n}\geq n/2$, where $n$ is an integer larger than $2$. Furthermore, a formula is established to calculate the exact number of these sequences. The distribution of nonlinear complexity for these sequences is thus completely determined.
On the Interplay between Self-Driving Cars and Public Transportation
Creators: name: Lanzetti, Nicolas
name: Schiffer, Maximilian
name: Ostrovsky, Michael
name: Pavone, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: Cities worldwide struggle with overloaded transportation systems and their externalities. The emerging autonomous transportation technology has the potential to alleviate these issues, but the decisions of profit-maximizing operators running large autonomous fleets could negatively impact other stakeholders and the transportation system. An analysis of these tradeoffs requires modeling the modes of transportation in a unified framework. In this paper, we propose such a framework, which allows us to study the interplay among mobility service providers (MSPs), public transport authorities, and customers. Our framework combines a graph-theoretic network model for the transportation system with a game-theoretic market model in which MSPs are profit maximizers while customers select individually-optimal transportation options. We apply our framework to data for the city of Berlin and present sensitivity analyses to study parameters that MSPs or municipalities can strategically influence. We show that autonomous ride-hailing systems may cannibalize a public transportation system, serving between 7% and 80% of all customers, depending on market conditions and policy restrictions.
description: Accepted for publication in the IEEE Transactions on Control of Network Systems
Globally Consistent 3D LiDAR Mapping with GPU-accelerated GICP Matching Cost Factors
Creators: name: Koide, Kenji
name: Yokozuka, Masashi
name: Oishi, Shuji
name: Banno, Atsuhiko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper presents a real-time 3D LiDAR mapping framework based on global matching cost minimization. The proposed method constructs a factor graph that directly minimizes matching costs between frames over the entire map, unlike pose graph-based approaches that minimize errors in the pose space. For real-time global matching cost minimization, we use a voxel data association-based GICP matching cost factor that is able to fully leverage GPU parallel processing. The combination of the matching cost factor and GPU computation enables constraint of the relative pose between frames with a small overlap and creation of a densely connected factor graph. The mapping process is managed based on a voxel-based overlap metric that can quickly be evaluated on a GPU. We incorporate the proposed method with an external loop detection method in order to help the voxel-based matching cost factors to avoid convergence in a local solution. The experimental result on the KITTI dataset shows that the proposed approach improves the estimation accuracy of long trajectories.
description: IEEE Robotics and Automation Letters, Video: https://youtu.be/TarRKF_Xd2E
Additional file 1 of High intake of vegetables is linked to lower white blood cell profile and the effect is mediated by the gut microbiome
Creators: name: Menni, Cristina
name: Louca, Panayiotis
name: Berry, Sarah E.
name: Vijay, Amrita
name: Astbury, Stuart
name: Leeming, Emily R.
name: Gibson, Rachel
name: Asnicar, Francesco
name: Piccinno, Gianmarco
name: Wolf, Jonathan
name: Davies, Richard
name: Mangino, Massimo
name: Segata, Nicola
name: Spector, Tim D.
name: Valdes, Ana M.
Publisher: name: figshare
Year: 2021
Subjects: subject: Immunology
subject: FOS: Clinical medicine

description: Additional file 1: Table S1. Vegetables aggregated to characteristic groups. Table S2. Standardised coefficients and 95%CI of FDR (q
Japanese direct foreign investment in the United States and Canada by sogo shosha since 1951
Creators: name: Kurihara, Tamiko
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the spatial and sectoral characteristics of Japanese Direct Foreign Investment (DFI) since 1951 with particular attention to sogo shosha investment in the United States and Canada. The thesis presents five main conclusions. First, the internal conditions of Japan have considerably influenced Japanese DFI and the role of sogo shosha. Second, the investment climate of the United States has proved increasingly attractive to Japan. The United States has received the largest amount of postwar accumulated Japanese DFI. Canada with a smaller market and less favorable investment environment has received a smaller amount of investment ranking overall eleventh in total Japanese DFI in the world. Third, Japanese investment has been directed at securing a supply of natural resources. It has also sought a market for its manufactured products by increasing its investment in commerce and services. Throughout much of the period, manufacturing investment has concentrated in developing countries but this situation is changing with an increasing proportion in North America in the last ten years. Most significantly with the rising value of the yen, major financial investments are now occurring in North America. Fourth, sogo shosha investment long associated with commerce has locationally been flexible in the North American context, setting up new offices in the rapidly emerging information and transportation centers such as Los Angeles and Denver. However, except for single resource-based areas, sogo shosha investment has little effect on regional economies. While the sogo shosha proportion of total Japanese DFI is declining, they still practice a well established management style involving minority equity shareholding and long-term purchasing contracts in North American companies which give them access to information and management decision-making. Finally, the thesis shows the need for theoretical explanations of Japanese DFI to be revised in the light of the constantly changing empirical dimensions and an understanding of the importance of Japan in the contemporary world economy.
Be More Active! Understanding the Differences between Mean and Sampled Representations of Variational Autoencoders
Creators: name: Bonheme, Lisa
name: Grzes, Marek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: I.2.6; G.3

description: The ability of Variational Autoencoders to learn disentangled representations has made them appealing for practical applications. However, their mean representations, which are generally used for downstream tasks, have recently been shown to be more correlated than their sampled counterpart, on which disentanglement is usually measured. In this paper, we refine this observation through the lens of selective posterior collapse, which states that only a subset of the learned representations, the active variables, is encoding useful information while the rest (the passive variables) is discarded. We first extend the existing definition to multiple data examples and show that active variables are equally disentangled in mean and sampled representations. Based on this extension and the pre-trained models from disentanglement lib, we then isolate the passive variables and show that they are responsible for the discrepancies between mean and sampled representations. Specifically, passive variables exhibit high correlation scores with other variables in mean representations while being fully uncorrelated in sampled ones. We thus conclude that despite what their higher correlation might suggest, mean representations are still good candidates for downstream tasks applications. However, it may be beneficial to remove their passive variables, especially when used with models sensitive to correlated features.
description: the main paper of 20 pages plus an appendix; 29 pages in total. Published as a JMLR article. The final version is available at https://jmlr.org/papers/v24/21-1145.html
title: ปัจจัยสู่ความสำเร็จในการจัดการแหล่งท่องเที่ยวเชิงเกษตร : กรณีศึกษาแหล่งท่องเที่ยว เชิงเกษตรในจังหวัดนครราชสีมา
Creators: name: ธนาวัฒน์ ปัทมฤทธิกุล
Publisher: name: งานวารสาร มหาวิทยาลัยนครพนม
publisherIdentifierScheme: ROR
Year: 2024
Subjects: ปัจจัยสู่ความสำเร็จ
แหล่งท่องเที่ยวเชิงเกษตร
การจัดการแหล่งท่องเที่ยวเชิงเกษตร
เกษตรทฤษฎีใหม่
เกษตรอินทรีย์

description: วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยนครพนม, 14, 2, 143-157
Piero Gazzola: restauro dei monumenti e conservazione dei centri storici e del paesaggio
Creators: name: Aveta, Claudia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Tale tesi di dottorato mira a definire il contributo di Piero Gazzola (1908-1979) nel campo del restauro architettonico e urbanistico nel complesso periodo storico tra gli anni precedenti e quelli successivi al secondo conflitto mondiale.
National Scientific Facilities and Their Science Impact on Non-Biomedical Research
Creators: name: Kinney, A. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: H-index, proposed by Hirsch is a good indicator of the impact of a scientist's research. When evaluating departments, institutions or labs, the importance of h-index can be further enhanced when properly calibrated for size. Particularly acute is the issue of federally funded facilities whose number of actively publishing scientists frequently dwarfs that of academic departments. Recently Molinari and Molinari developed a methodology that shows the h-index has a universal growth rate for large numbers of papers, allowing for meaningful comparisons between institutions. An additional challenge when comparing large institutions is that fields have distinct internal cultures, with different typical rates of publication and citation; biology is more highly cited than physics, which is more highly cited than engineering. For this reason, this study has focused on the physical sciences, engineering, and technology, and has excluded bio-medical research. Comparisons between individual disciplines are reported here to provide contextual framework. Generally, it was found that the universal growth rate of Molinari and Molinari holds well across all the categories considered, testifying to the robustness of both their growth law and our results. The overall goal here is to set the highest standard of comparison for federal investment in science; comparisons are made with the nations preeminent private and public institutions. We find that many among the national facilities compare favorably in research impact with the nations leading universities.
description: 22 pages, 7 figures
The origin of the mu_e - M_B and Kormendy relations in dwarf elliptical galaxies
Creators: name: Boselli, A.
name: Boissier, S.
name: Cortese, L.
name: Gavazzi, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The present work is aimed at studying the distribution of galaxies of different types and luminosities along different structural scaling relations to see whether massive and dwarf ellipticals have been shaped by the same formation process. This exercise is here done by comparing the distribution of Virgo cluster massive and dwarf ellipticals and star forming galaxies along the B band effective surface brightness and effective radius vs. absolute magnitude relations and the Kormendy relation to the predictions of models tracing the effects of ram-pressure stripping on disc galaxies entering the cluster environment and galaxy harassment. Dwarf ellipticals might have been formed from low luminosity, late-type spirals that recently entered into the cluster and lost their gas because of a ram-pressure stripping event, stopping their activity of star formation. The perturbations induced by the abrupt decrease of the star formation activity are sufficient to modify the structural properties of disc galaxies into those of dwarf ellipticals. Galaxy harassment induce a truncation of the disc and generally an increase of the effective surface brightness of the perturbed galaxies. The lack of dynamical simulations of perturbed galaxies spanning a wide range in luminosity prevents us to drive any firm conclusion on a possible harassment-induced origin of the low surface brightness dwarf elliptical galaxy population inhabiting the Virgo cluster. Although the observed scaling relations are consistent with the idea that the distribution of elliptical galaxies along the mentioned scaling relation is just due to a gradual variation with luminosity of the Sersic index n, the comparison with models indicates that dwarf ellipticals might have been formed by a totally different process than giant ellipticals
description: Accepted for publication on A&A
Spin-Phonon Resonances in Nearly Polar Metals with Spin-Orbit Coupling
Creators: name: Kumar, Abhishek
name: Chandra, Premala
name: Volkov, Pavel A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In metals in the vicinity of a polar transition, interactions between electrons and soft phonon modes remain to be determined. Here we explore the consequences of spin-orbit assisted electron-phonon coupling on the collective modes of such nearly polar metals in the presense of magnetic field. We find that the soft polar phonon hybridizes with spin-flip electronic excitations of the Zeeman-split bands leading to an anticrossing. The associated energy splitting allows for an unambiguous determination of the strength of the spin-orbit mediated coupling to soft modes in polar metals by spectroscopic experiments. The approach to the polar transition is reflected by the softening of the effective g-factor of the hybridized spin-flip mode. Analyzing the static limit, we find that the polar order parameter can be oriented by magnetic field. This provides possibilities for new switching protocols in polar metallic materials. We demonstrate that the effects we predict can be observed with current experimental techniques and discuss promising material candidates.
description: Published version: 23 pages, 6 figures
"L’unità nella diversità. Religioni, etnie e civiltà del Kazakhstan contemporaneo" a cura di Dario Citati e Alessandro Lundini
Creators: name: Amoretti Scarcia, Biancamaria
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2015

description: Semestrale di studi e ricerche di geografia, N. 2 (2014)
Decomposable $(5,6)$-solutions in eleven-dimensional supergravity
Creators: name: Chi, Hanci
name: Chrysikos, Ioannis
name: Schneider, Eivind
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 83E50

description: We present decomposable (5,6)-solutions $\widetilde{M}^{1,4} \times M^6$ in eleven-dimensional supergravity by solving the bosonic supergravity equations for a variety of non-trivial flux forms. Many of the bosonic backgrounds presented here are induced by various types of null flux forms on products of certain totally Ricci-isotropic Lorentzian Walker manifolds and Ricci-flat Riemannian manifolds. These constructions provide an analogue of work done by I. Chrysikos and A. Galaev who made similar computations for decomposable (6,5)-solutions. We also present bosonic backgrounds that are products of Lorentzian Einstein manifolds with negative Einstein constant (in the "mostly plus" convention) and Riemannian Kähler-Einstein manifolds with positive Einstein constant. This conclusion generalizes a result of C. N. Pope and P. van Nieuwenhuizen concerning the appearance of six-dimensional Kähler-Einstein manifolds in eleven-dimensional supergravity. In this setting we construct infinitely many non-symmetric decomposable (5, 6)-supergravity backgrounds by using the infinitely many Lorentzian Einstein-Sasakian structures with negative Einstein constant on the 5-sphere, known from the work of C. P. Boyer et al.
description: Accepted manuscript, 30 pages
Additional file 3 of Microdiversity and phylogeographic diversification of bacterioplankton in pelagic freshwater systems revealed through long-read amplicon sequencing
Creators: name: Okazaki, Yusuke
name: Fujinaga, Shohei
name: Salcher, Michaela M.
name: Callieri, Cristiana
name: Tanaka, Atsushi
name: Ayato Kohzu
name: Oyagi, Hideo
name: Tamaki, Hideyuki
name: Shin-Ichi Nakano
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2: Supplementary Table S2. Comparison of the 23Sr (original) and 23Sr-mod (modified for the present study) primers, showing their coverage for each phylum. Coverage was determined using the TestProbe 3.0 tool with reference to the SILVA LSU 132 Parc database (Quast et al., [55] allowing no mismatches.
"Territorialità: concetti, narrazioni, pratiche. Saggi per Angelo Turco", Claudio Arbore, Marco Maggioli (a cura di)
Creators: name: Spagnoli, Luisa
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2018

description: Semestrale di studi e ricerche di geografia, N. 1 (2018)
CLAP for modified gravity: scalar instabilities in binary black hole spacetimes
Creators: name: Annulli, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The close limit approximation of binary black hole is a powerful method to study gravitational-wave emission from highly non-linear geometries. In this work, we use it as a tool to model black hole spacetimes in theories of gravity with a new fundamental scalar degree of freedom. As an example, we consider Einstein-scalar-Gauss-Bonnet gravity, which admits as solution the Schwarzschild geometry as well as black holes with scalar hair. Accordingly, we find scalar perturbations growing unbounded around binary systems. This "dynamical scalarization" process is easier to trigger (i.e. occurs at lower values of the coupling constant of the theory) than the corresponding process for isolated black holes. Our results and framework highlight the fundamental role of the interaction during the collision of compact objects. They also emphasize the importance of having waveforms for black hole binaries in alternative theories, in order to consistently perform tests beyond General Relativity.
description: 8 pages, 2 figures. Comments are welcome
Some aspects of rational points and rational curves
Creators: name: Wittenberg, Olivier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Various methods have been used to construct rational points and rational curves on rationally connected algebraic varieties. We survey recent advances in two of them, the descent and the fibration method, in a number-theoretical context (rational points over number fields) and in an algebro-geometric one (rational curves on real varieties), and discuss the question of rational points over function fields of p-adic curves.
description: 20 pages; for the ICM 2022 proceedings; v2: updated bibliography, final version
Unbalanced Renormalization of Tunneling in MOSFET-type Structures in Strong High-Frequency Electric Fields
Creators: name: Solenov, Dmitry
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: Two-dimensional electron gas coupled to adjacent impurity sites in high-frequency out-of-plane ac control electric field is investigated. Modification of tunneling rates as a function of the field amplitude is calculated. Nonlinear dependence on the ac field strength is reported for the conductivity of two-dimensional electron gas. It develops a periodic peak structure.
description: 9 pages, 4 figures
Three-fluid plasmas in star formation II. Momentum transfer rate coefficients
Creators: name: Pinto, Cecilia
name: Galli, Daniele
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The charged component of the insterstellar medium consists of atomic and molecular ions, electrons, and charged dust grains, coupled to the local Galactic magnetic field. Collisions between neutral particles (mostly atomic or molecular hydrogen) and charged species, and between the charged species themselves, affect the magnetohydrodynamical behaviour of the medium and the dissipation of electric currents. The friction force due to elastic collisions between particles of different species in the multi-component interstellar plasma is a nonlinear function of the temperature of each species and the Mach number of the relative drift velocity. The aim of this paper is to provide an accurate and, as far as possible, complete set of momentum transfer rate coefficients for magnetohydrodynamical studies of the interstellar medium. Momentum transfer rates are derived from available experimental data and theoretical calculations of cross sections within the classic approach developed by Boltzmann and Langevin for a wide range of values of the temperature and the drift velocity. Accurate numerical values for momentum transfer rates are obtained and fitted to simple analytical formulae expressing the dependence of the results on the gas temperature and the relative drift velocity. The often used polarization approximation is in satisfactory agreement with our results only for collisions between H2and molecular ions (HCO+, H3+). For other kinds of collisions, the polarization approximation fails by large factors, and must be replaced by more accurate expressions.
description: 13 pages, 21 figures, accepted for publication on A&A
Additional file 1 of Cumulative live birth rates after IVF/ICSI cycles with sperm prepared by density gradient centrifugation vs. swim-up: a retrospective study using a propensity score-matching analysis
Creators: name: Rao, Meng
name: Tang, Li
name: Wang, Longda
name: Chen, Mengxiang
name: Yan, Gaofeng
name: Zhao, Shuhua
Publisher: name: figshare
Year: 2022
Subjects: subject: Biophysics
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Marine Biology

description: Additional file 1: Supplementary Table 1. Comparisons of outcomes between cycles preparing sperm with DGC and SU in cycles with different male age.
Studio dell’espressione dell’Homeobox gene CDX2 nella metaplasia intestinale e nelle lesioni neoplastiche e preneoplastiche dello stomaco  e correlazioni clinico-patologiche con l’infezione da Helicobacter Pilory
Creators: name: Somma, Pasquale
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: BACKGROUND: Gastric carcinoma can be divided into the intestinal and diffuse type, or the differentiated and indifferentiated type, on the basis of its tendency to gland formation. Intestinal metaplasia (IM), where intestinal-type carcinoma is thought to develop, is classified into incomplete and complete types. The latter, which resembles small-intestinal absorptive epithelium, has been considered a precancerous lesion, and its development is strongly associated with Helicobacter Pilory (HP) infection.
The molecular mechanism underlying the onset of IM remain elusive.
AIMS: To evaluate the evolution of the IM, and to study by immunohistochemistry the expression of the homeobox gene CDX2 in  IM before and after the pharmacological  treatment for the Helicobacter Pilory eradication, and in 10 cases of gastric carcinoma of intestinal type with associated precancerous lesions.
MATERIALS AND METHODS: Formalin-fixed and paraffin embedded tissue from gastric biopsy of 30 patients with complete IM, and 10 cases of gastric carcinoma (pT2bN1Mx) of intestinal type were enrolled. HP infection was assessed by modified Giemsa staining and CDX2 expression by immunohistochemical staining. For each cases of IM we  studied two biopsies (before and after HP treatment). 11 cases of gastric biopsy specimens from normal controls were used as control. RESULTS: CDX2 was expressed in a nuclear pattern in all cases of IM before and after the pharmacological treatment for HP. All but one gastric carcinoma were negative for CDX2, in one case we found a quickly CDX2 cytoplasmatic expression.
CONCLUSION: Our data confirm that CDX2 represent a transcription factor which is involved in the different aspects of gastric pathogenesis. It may be of special importance in inflammatory condition resulting in the development of intestinal metaplasia. However, CDX2 expression is reduced in gastric carcinomas as compared with IM. On the other hand, it is associated with tumor progression in the subgroup of intestinal carcinoma. Our results, in according with the data reported in literature to date, indicate that CDX2 expression in gastric cancer tissues can be a novel prognostic marker for patient survival.
"Fondamenti di Geografia Una geografia passiva, socialmente conservativa (vol. I) Strutture dei geosistemi. Interdipendenze e diversità regionali (vol. II)" di Francesco Adamo
Creators: name: Weiss, Chiara
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2018

description: Semestrale di studi e ricerche di geografia, N. 1 (2018)
Governing globalisation. The energy debate between nature and macroeconomic issues
Creators: name: Battisti, Gianfranco
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2015

description: Keywords: globalisation, energy, climate change

Dagli anni ’70 il tema del cambiamento climatico si è imposto gradualmente al centro del dibattito culturale e politico, parallelamente all’emergere di una economia globalizzata. In questo contesto, il trattato di Kyoto può venire considerato, assieme al WTO, un sofisticato strumento di governo per la sempre crescente complessità del mondo economico. Nel presente lavoro viene analizzato l’ambito geografico degli accordi di Kyoto. Dal sostegno quasi unanime registrato fra i governi nel 1972, la volontà politica si è costantemente ridotta a causa del prezzo elevato da pagare in
termini di sviluppo economico. Quando l’Unione Europea ha deciso nel 2005 di procedere da sola, era chiaro che qualsiasi riduzione delle emissioni di CO2 effettuata dagli Stati membri non avrebbe avuto alcun effetto sulla dinamica attesa del riscaldamento globale. Inoltre, dopo il volgere del millennio i dati sperimentali hanno dimostrato che l’aumento continuo delle emissioni di anidride carbonica non è più collegato all’aumento delle temperature, quasi che il riscaldamento globale avesse
terminato il suo corso. Un’analisi degli interessi economici in gioco consente di rivelare la logica della decisione europea. Tre aree di vantaggio vengono delineate: ideologica, economica, di politica economica, che si situano tutte sia all’interno che all’esterno dell’Unione. Di particolare importanza è la nascita di nuovi campi di attività, non limitati al settore industriale. Alla luce della progressiva riduzione dell’industria
europea registrata nell’ultima decade e della crescente finanziarizzazione di tutte le economie del continente, è importante considerare l’emergere di un settore “climatico” della finanza, assai più ampio delle transazioni sui diritti di emissione. Viene inoltre considerata la strategia mondiale degli USA. Questi perseguono attualmente l’obiettivo di riguadagnare la leadership nella politica ambientale assieme a quello di ritornare ad essere il maggior esportatore mondiale di idrocarburi.
description: Semestrale di studi e ricerche di geografia, N. 1 (2014)
Energy vulnerable households: observing energetic consumption versus estimating potential energetic demand
Creators: name: Martellozzo, Federico
name: Mermet, Samuel
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2015

description: Keywords: energetic consumption, natural resources, environment

Recentemente il consumo di risorse naturali da parte dell’uomo ha raggiunto livelli inimmaginabili; conseguentemente anche la preoccupazione per il depauperamento accelerato dell’ambiente naturale è aumentata ed è divenuto un argomento di ampio interesse sociale e scientifico. Questo fenomeno viene spesso rappresentato come il
conflitto tra la necessità di aumentare la base di risorse disponibili per alimentare lo sviluppo umano da un lato; e dall’altro, il bisogno di ridurre la pressione umana sull’ambiente, in quanto fattore funzionale all’accrescimento della capacità di resilienza del nostro pianeta. Molto spesso la soluzione a tale conflitto è basata sul raggiungimento
di obiettivi stabiliti a priori in termini di miglioramento delle prestazioni –
questo è particolarmente vero per ciò che concerne l’energia. In questo studio, tuttavia, si vuole proporre un quadro operativo differente che si distanzia dall’osservazione del consumo reale di energia, e si concentra piuttosto sulla stima di un quantitativo ipotetico necessario al soddisfacimento di una serie di bisogni specifici. Il modello qui presentato mira a servire principalmente come strumento per lo studio della vulnerabilità energetica e vuole fornire un utile strumento a supporto dell’azione pubblica in tal senso. Il lavoro di modellazione prende come unità di analisi il singolo nucleo abitativo e vuole stimare solo il fabbisogno energetico necessario per il consumo domestico e la mobilità professionale. Le osservazioni qui presentate fanno parte del progetto di ricerca Efficacité Energétique, finanziato dal LABEX Futurs Urbains (Ecole des Ponts ParisTech, Université Paris-Est).
description: Semestrale di studi e ricerche di geografia, N. 1 (2014)
Evaluating the potential for energy consumption reduction through urban renewal: quantitative modelling from the French Census
Creators: name: Bonin, Olivier
name: Gessalin, André
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2015

description: Keywords: energy efficiency, modelling, urban renewal operations

Gli Autori propongono un modello di calcolo del consumo di energia in relazione a un progetto di rinnovamento urbanistico. Questo modello, che utilizza i dati disaggregati del censimento della popolazione, restituisce la stima del consumo relativa a un’abitazione, a la mobilità casa-lavoro e ad altri spostamenti. I dati sono disaggregati per comune e, solo in parte, a scala sub-comunale, consentendo così di tenere conto delle caratteristiche socio-economiche della tipologia di residenti che il nuovo progetto urbano dovrebbe attirare. Nel contributo sono messi a confronto il consumo
energetico del progetto “futuro” con quelli attuali della città, per fornire una valutazione dei potenziali benefici derivanti dai maggiori investimenti nel trasporto pubblico o nell’efficienza energetica degli edifici. L’applicazione del modello proposto in due comuni apparentemente simili definisce degli scenari utili per la definizione di progetti efficaci in termini di consumo energetico.
description: Semestrale di studi e ricerche di geografia, N. 1 (2014)
Un saluto per un augurio
Creators: name: De Vecchis, Gino
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: Radici e origini: un binomio solo apparentemente sinonimico, che bene si addice a questa riflessione, con cui si chiude la mia direzione del Semestrale di Studi e Ricerche di Geografia. Intendo infatti evidenziarne non soltanto la lunga durata temporale, ma anche tutta la vivace forza di una continuità che ha contribuito a offrire ai geografi della Facoltà di Lettere e Filosofia della Sapienza un segnale chiaro per irrobustire il senso di appartenenza a una riconosciuta comunità scientifica, che solo come tale può – e deve – aprirsi il più possibile all’incontro con gli altri saperi in un reciproco arricchimento culturale.

Un ringraziamento a parte merita Riccardo Morri, che più di tutti, e ormai da tanti anni, si è impegnato nel Semestrale con grande dedizione, ma anche con un contributo notevole di idee e di proposte innovative. Il suo operato, dapprima come Segretario, ha avuto nel 2008 un significativo riconoscimento ufficiale con l’attribuzione della Vicedirezione, e nel 2013 della Condirezione. In tutto il quadriennio, collaborando con lui in maniera intensa e costante, ho potuto apprezzare le sue ragguardevoli capacità organizzative e scientifiche. Ritengo pertanto del tutto naturale che, terminata questa esperienza per me felice, sia lui ad assumere la responsabilità della Rivista al livello più alto. Al nuovo Direttore e a questa preziosa Rivista auguro sentitamente di continuare a valorizzare l’immagine e la presenza della geografia nel panorama scientifico e culturale, in un futuro di crescenti e meritati successi.
description: Semestrale di studi e ricerche di geografia, N. 2 (2017): Ripensare lo spazio sociale: reti, mobilità,territorialità