cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum corrections to the Larmor radiation formula in scalar electrodynamics
Creators: name: Higuchi, A.
name: Walker, P. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use the semi-classical approximation in perturbative scalar quantum electrodynamics to calculate the quantum correction to the Larmor radiation formula to first order in Planck's constant in the non-relativistic approximation, choosing the initial state of the charged particle to be a momentum eigenstate. We calculate this correction in two cases: in the first case the charged particle is accelerated by a time-dependent but space-independent vector potential whereas in the second case it is accelerated by a time-independent vector potential which is a function of one spatial coordinate. We find that the corrections in these two cases are different even for a charged particle with the same classical motion. The correction in each case turns out to be non-local in time in contrast to the classical approximation.
description: 19 pages
On the Relation between Operator Constraint --, Master Constraint --, Reduced Phase Space --, and Path Integral Quantisation
Creators: name: Han, Muxin
name: Thiemann, Thomas
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Path integral formulations for gauge theories must start from the canonical formulation in order to obtain the correct measure. A possible avenue to derive it is to start from the reduced phase space formulation. In this article we review this rather involved procedure in full generality. Moreover, we demonstrate that the reduced phase space path integral formulation formally agrees with the Dirac's operator constraint quantisation and, more specifically, with the Master constraint quantisation for first class constraints. For first class constraints with non trivial structure functions the equivalence can only be established by passing to Abelian(ised) constraints which is always possible locally in phase space. Generically, the correct configuration space path integral measure deviates from the exponential of the Lagrangian action. The corrections are especially severe if the theory suffers from second class secondary constraints. In a companion paper we compute these corrections for the Holst and Plebanski formulations of GR on which current spin foam models are based.
description: 43 pages
Final spins from the merger of precessing binary black holes
Creators: name: Kesden, Michael
name: Sperhake, Ulrich
name: Berti, Emanuele
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The inspiral of binary black holes is governed by gravitational radiation reaction at binary separations r < 1000 M, yet it is too computationally expensive to begin numerical-relativity simulations with initial separations r > 10 M. Fortunately, binary evolution between these separations is well described by post-Newtonian equations of motion. We examine how this post-Newtonian evolution affects the distribution of spin orientations at separations r ~ 10 M where numerical-relativity simulations typically begin. Although isotropic spin distributions at r ~ 1000 M remain isotropic at r ~ 10 M, distributions that are initially partially aligned with the orbital angular momentum can be significantly distorted during the post-Newtonian inspiral. Spin precession tends to align (anti-align) the binary black hole spins with each other if the spin of the more massive black hole is initially partially aligned (anti-aligned) with the orbital angular momentum, thus increasing (decreasing) the average final spin. Spin precession is stronger for comparable-mass binaries, and could produce significant spin alignment before merger for both supermassive and stellar-mass black hole binaries. We also point out that precession induces an intrinsic accuracy limitation (< 0.03 in the dimensionless spin magnitude, < 20 degrees in the direction) in predicting the final spin resulting from the merger of widely separated binaries.
description: 20 pages, 16 figures, new PN terms, submitted to PRD
A Neural Network Approach to High Energy Cosmic Rays Mass Identification
Creators: name: Riggi, Simone
name: Caruso, Rossella
name: Insolia, Antonio
name: Scuderi, Mario
Publisher: name: INFN Open Access Repository
Year: 2007

description: An event-by-event study, based on neural network methods, of the mass identification in high energy cosmic rays was carried out with simulated data, in order to check the possibility of analyzing real data measured at the Pierre Auger Observatory. Extensive air showers were simulated with the CORSIKA code, using the hadronic model QGSJET98. The goodness of the method in recognizing the mass of the primary was tested making use of the parameters extracted from the simulated longitudinal profiles. We showed that the designed supervised neuralnetwork  is able to discriminate, with high identification efficiency and purity, between proton- and iron-induced showers. We tested our method also in presence of a four components primary flux (proton, helium, oxygen, and iron). Typical results for the classification matrix obtained are presented and discussed.
Chi-square and Poissonian Data: Biases Even in the High-Count Regime and How to Avoid them
Creators: name: Humphrey, Philip J.
name: Liu, Wenhao
name: Buote, David A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We demonstrate that two approximations to the chi^2 statistic as popularly employed by observational astronomers for fitting Poisson-distributed data can give rise to intrinsically biased model parameter estimates, even in the high counts regime, unless care is taken over the parameterization of the problem. For a small number of problems, previous studies have shown that the fractional bias introduced by these approximations is often small when the counts are high. However, we show that for a broad class of problem, unless the number of data bins is far smaller than \sqrt{N_c}, where N_c is the total number of counts in the dataset, the bias will still likely be comparable to, or even exceed, the statistical error. Conversely, we find that fits using Cash's C-statistic give comparatively unbiased parameter estimates when the counts are high. Taking into account their well-known problems in the low count regime, we conclude that these approximate chi^2 methods should not routinely be used for fitting an arbitrary, parameterized model to Poisson-distributed data, irrespective of the number of counts per bin, and instead the C-statistic should be adopted. We discuss several practical aspects of using the C-statistic in modelling real data. We illustrate the bias for two specific problems, measuring the count-rate from a lightcurve and obtaining the temperature of a thermal plasma from its X-ray spectrum measured with the Chandra X-ray observatory. In the context of X-ray astronomy, we argue the bias could give rise to systematically mis-calibrated satellites and a ~5-10% shift in galaxy cluster scaling relations.
description: 9 pages, 2 figures. Accepted for publication in the Astrophysical Journal
Solenoid Magnet and Flux Return for the PANDA Detector
Creators: name: Bersani, Andrea
name: Parodi, Renzo
name: Pastorino, Andrea
Publisher: name: INFN Open Access Repository
Year: 2007

description: In this paper we present the project of the Solenoid Magnet for the PANDA detector developed in Genova. This project features a coil realized with a Rutherford--type, aluminum stabilized superconducting cable, wound inside an aluminum alloy coil former and indirectly cooled with a forced circulation of liquid helium. The concept of this magnet is based on many other working magnets, developed for different detectors, such as BaBar, Finuda, Delphi or CMS. A complete characterization of the magnetic, mechanical and thermal properties of the magnet is presented, with an ansatz on the time schedule to be followed to fulfill the detector deadlines.
Traction Tests for The Qualification of the TTF/ILC Composite Support Posts
Creators: name: S. Barbanotti
name: M. Bonezzi
name: M. Todero
name: N. Panzeri
Publisher: name: INFN Open Access Repository
Year: 2008

description: Between January and June 2007 a new set of 6 low thermal conduction structural supports for the TTF cold mass has been produced at INFN Milano LASA. The support posts will be used for the cryomodule that will be delivered by INFN for the ILCTA at FNAL. This document resumes the characteristics of the pieces produced and describes the tests and measurements performed to characterize and qualify these devices.
Repeated and continuous interactions in open quantum systems
Creators: name: Bruneau, Laurent
name: Joye, Alain
name: Merkli, Marco
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C10

description: We consider a finite quantum system S coupled to two environments of different nature. One is a heat reservoir R (continuous interaction) and the other one is a chain C of independent quantum systems E (repeated interaction). The interactions of S with R and C lead to two simultaneous dynamical processes. We show that for generic such systems, any initial state approaches an asymptotic state in the limit of large times. We express the latter in terms of the resonance data of a reduced propagator of S+R and show that it satisfies a second law of thermodynamics. We analyze a model where both S and E are two-level systems and obtain the asymptotic state explicitly (lowest order in the interaction strength). Even though R and C are not direcly coupled, we show that they exchange energy, and we find the dependence of this exchange in terms of the thermodynamic parameters. We formulate the problem in the framework of W*-dynamical systems and base the analysis on a combination of spectral deformation methods and repeated interaction model techniques. We do not use master equation approximations.
Augmented dye eradication from wastewater using alkali-aided, reinforced waste acacia (Acacia auriculiformis) leaves
Creators: name: Samal, Priyanka Priyadarsini
name: Qaiyum, Md. Atif
name: Dutta, Subhashri
name: Dey, Banashree
name: Dey, Soumen
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Plant Biology

description: The present investigation demonstrates the augmented dye scavenging from wastewater using alkali-mutated acacia (Acacia auriculiformis) leaves powder. The material was synthesized by mild chemical activation by using 0.1 M sodium hydroxide as an activator under room temperature stirring for 3h and isolated as a dark brown powder. The material was characterized using FTIR, FESEM, XRD, and pHzpc; and tested successfully with crystal violet and methylene blue. While FTIR confirms the presence of polyphenolic and polysaccharide moieties, FESEM reveals unprecedented circular hollow pipe-like channels decorated in a highly ordered fashion, facing pores for optimum dye uptake. The adsorption is tunable with working pH, and the maximum adsorption capacities are 67.25 and 78.55 mg g−1 for CV and MB. Both adsorption process follows Langmuir isotherm (R2 = 0.994) and pseudo-2nd-order kinetics (R2 = 0.999). Thermodynamic analysis verifies a spontaneous process with an endothermic interaction beside an elevated degree of randomness. About 80% of the spent material could be regenerated using 1:1 methanol/water. Analysis of industrial effluent suggests 37% removal per cycle, with an operating ceiling of 95%. To wind up, due to huge availability, porous nature, and superior adsorption capacity over other phytosorbents, NaOH-activated acacia leaves could be considered as techno-economic and potential scavengers for sustainable water treatment. Lignocellulosic waste plant litters have enormous potential for biosorption of heavy metals and dyes for their economic viability and environment-friendly nature. The present investigation highlights the promising cationic dye scavenging ability of alkali-treated waste acacia (A. auriculiformis) leaves from simulated and industrial wastewater. With adsorption capacities of 67.25 and 78.55 mg g−1 for crystal violet and methylene blue respectively, the protocol shows promise in colored water treatment. Easy preparation, classy removal efficiency, and recyclability offer the key advantage with a techno-economic impact.
Isolation of phytochemicals from Dolichandrone atrovirens followed by semisynthetic modification of ixoside via azomethine ylide cycloaddition; computational approach towards chemo-selection
Creators: name: Singh, Meenakshi
name: Hirlekar, Bhakti Umesh
name: Mondal, Shagufta
name: Pant, Suyash
name: Dhaked, Devendra K.
name: Ravichandiran, V.
name: Hazra, Abhijit
name: Bharitkar, Yogesh P.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Biotechnology
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: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Inorganic Chemistry

description: Aims of the study were the phytochemical investigation and chemical transformation of isolated compounds of medicinal plant listed in ‘Ayurveda’ like Dolichandrone atrovirens, endemic to Indian subcontinents. From chloroform extract of D. atrovirens four compounds; Ursolic acid (1), Maslinic acid (2), Lupeol (3), β-sitosterol (4) and from methanol extract five compounds; β-sitosterol-3-O-β-D-glucopyranoside (5), 10-O-trans-p-Methoxycinnamoylcatalpol (6), Kaempferol-3-O-β-D-glucopyranoside (7), 6-O-[6"(S)-hydroxy-2",6"dimethyl-2"(E)-7"-octadienoyl] catalpol (8) and Ixoside (9) were isolated. Ixoside was used for the semi-synthetic modification via azomethine ylide cycloaddition leading to novel spiro-oxindolo-pyrrolizidine adduct. The structures of novel adducts were elucidated by analysis of IR, MS and 1 D/2D NMR data. Furthermore, to confirm the chemo selection of only one double bond, we performed density functional theory (DFT) calculation, which confirms the chemo selectivity. In addition, in-silico ADME studies and atom-additive approach based on SASA was also examined for the molecules which suggest that they may be potential future candidates for drug discovery.
Properties of hyperons in chiral perturbation theory
Creators: name: Camalich, J. Martin
name: Geng, L. S.
name: Alvarez-Ruso, L.
name: Vacas, M. J. Vicente
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The development of chiral perturbation theory in hyperon phenomenology has been troubled due to power-counting subtleties and to a possible slow convergence. Furthermore, the presence of baryon-resonances, e.g. the lowest-lying decuplet, complicates the approach, and the inclusion of their effects may become necessary. Recently, we have shown that a fairly good convergence is possible using a renormalization prescription of the loop-divergencies which recovers the power counting, is covariant and consistent with analyticity. Moreover, we have systematically incorporated the decuplet resonances taking care of both power-counting and $consistency$ problems. A model-independent understanding of diferent properties including the magnetic moments of the baryon-octet, the electromagnetic structure of the decuplet resonances and the hyperon vector coupling $f_1(0)$, has been successfully achieved within this approach. We will briefly review these developments and stress the important role they play for an accurate determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$ from hyperon semileptonic decay data.
description: To appear in HypX Proceedings
Aetherizing Lambda: Barotropic Fluids as Dark Energy
Creators: name: Linder, Eric V.
name: Scherrer, Robert J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the class of barotropic fluid models of dark energy, in which the pressure is an explicit function of the density, p = f(ρ). Through general physical considerations we constrain the asymptotic past and future behaviors and show that this class is equivalent to the sum of a cosmological constant and a decelerating perfect fluid, or "aether", with w_{AE}\ge0. Barotropic models give substantially disjoint predictions from quintessence, except in the limit of \LambdaCDM. They are also interesting in that they simultaneously can ameliorate the coincidence problem and yet "predict" a value of w\approx-1.
description: 6 pages; v2 matches PRD published version
Permutability of Backlund Transformation for N=1 Supersymmetric Sinh-Gordon
Creators: name: Gomes, J. F.
name: Ymai, L. H.
name: Zimerman, A. H.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The permutability of two Backlund transformations is employed to construct a non linear superposition formula to generate a class of solutions for the N=1 super sinh-Gordon model.
description: 10 pages. to appear in Phys. Lett. A
Coronavirus Risk Perception and Social Bias Survey: October 2020
Creators: name: Enns, Peter K.
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Concern about coronavirus (COVID-19) infection (1); bias or mistreatment related to coronavirus outbreak (5); racial groups worried about coronavirus outbreak (4); racial groups more likely to get coronavirus compared to whites in the United States (3); agree or disagree with statements about racial minority groups overcoming prejudice (2).
Evaluation of models for prognosing mortality in critical care patients with COVID-19: First- and second-wave data from a German university hospital
Creators: name: Kieninger, Martin
name: Dietl, Sarah
name: Sinning, Annemarie
name: Gruber, Michael
name: Gronwald, Wolfram
name: Zeman, Florian
name: Lunz, Dirk
name: Dienemann, Thomas
name: Schmid, Stephan
name: Graf, Bernhard
name: Lubnow, Matthias
name: Müller, Thomas
name: Holzmann, Thomas
name: Salzberger, Bernd
name: Kieninger, Bärbel
Publisher: name: Universität Regensburg
Year: 2022
Subjects: subject: 610 Medizin

description: Background In a previous study, we had investigated the intensive care course of patients with coronavirus disease 2019 (COVID-19) in the first wave in Germany by calculating models for prognosticating in-hospital death with univariable and multivariable regression analysis. This study analyzed if these models were also applicable to patients with COVID-19 in the second wave. Methods This retrospective cohort study included 98 critical care patients with COVID-19, who had been treated at the University Medical Center Regensburg, Germany, between October 2020 and February 2021. Data collected for each patient included vital signs, dosage of catecholamines, analgosedation, anticoagulation, and antithrombotic medication, diagnostic blood tests, treatment with extracorporeal membrane oxygenation (ECMO), intensive care scores, ventilator therapy, and pulmonary gas exchange. Using these data, expected mortality was calculated by means of the originally developed mathematical models, thereby testing the models for their applicability to patients in the second wave. Results Mortality in the second-wave cohort did not significantly differ from that in the first-wave cohort (41.8% vs. 32.2%, p = 0.151). As in our previous study, individual parameters such as pH of blood or mean arterial pressure (MAP) differed significantly between survivors and non-survivors. In contrast to our previous study, however, survivors and non-survivors in this study showed significant or even highly significant differences in pulmonary gas exchange and ventilator therapy (e.g. mean and minimum values for oxygen saturation and partial pressure of oxygen, mean values for the fraction of inspired oxygen, positive expiratory pressure, tidal volume, and oxygenation ratio). ECMO therapy was more frequently administered than in the first-wave cohort. Calculations of expected mortality by means of the originally developed univariable and multivariable models showed that the use of simple cut-off values for pH, MAP, troponin, or combinations of these parameters resulted in correctly estimated outcome in approximately 75% of patients without ECMO therapy.
Isolation of phytochemicals from Dolichandrone atrovirens followed by semisynthetic modification of ixoside via azomethine ylide cycloaddition; computational approach towards chemo-selection
Creators: name: Singh, Meenakshi
name: Hirlekar, Bhakti Umesh
name: Mondal, Shagufta
name: Pant, Suyash
name: Dhaked, Devendra K.
name: Ravichandiran, V.
name: Hazra, Abhijit
name: Bharitkar, Yogesh P.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Biotechnology
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: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Inorganic Chemistry

description: Aims of the study were the phytochemical investigation and chemical transformation of isolated compounds of medicinal plant listed in ‘Ayurveda’ like Dolichandrone atrovirens, endemic to Indian subcontinents. From chloroform extract of D. atrovirens four compounds; Ursolic acid (1), Maslinic acid (2), Lupeol (3), β- sitosterol (4) and from methanol extract five compounds; β-sitosterol-3-O-β-D-glucopyranoside (5), 10-O-trans-p-Methoxycinnamoylcatalpol (6), Kaempferol-3-O-β-D-glucopyranoside (7), 6-O-[6"(S)-hydroxy-2",6"dimethyl-2"(E)-7"-octadienoyl] catalpol (8) and Ixoside (9) were isolated. Ixoside was used for the semi-synthetic modification via azomethine ylide cycloaddition leading to novel spiro-oxindolo-pyrrolizidine adduct. The structures of novel adducts were elucidated by analysis of IR, MS and 1 D/2D NMR data. Furthermore, to confirm the chemo selection of only one double bond, we performed density functional theory (DFT) calculation, which confirms the chemo selectivity. In addition, in-silico ADME studies and atom-additive approach based on SASA was also examined for the molecules which suggest that they may be potential future candidates for drug discovery.
Predictive Modeling of Non-Viral Gene Transfer
Creators: name: Schwake, Gerlinde
name: Youssef, Simon
name: Kuhr, Jan-Timm
name: Gude, Sebastian
name: David, Maria Pamela
name: Mendoza, Eduardo
name: Frey, Erwin
name: Rädler, Joachim O.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: In non-viral gene delivery, the variance of transgenic expression stems from the low number of plasmids successfully transferred. Here, we experimentally determine Lipofectamine- and PEI-mediated exogenous gene expression distributions from single cell time-lapse analysis. Broad Poisson-like distributions of steady state expression are observed for both transfection agents, when used with synchronized cell lines. At the same time, co-transfection analysis with YFP- and CFP-coding plasmids shows that multiple plasmids are simultaneously expressed, suggesting that plasmids are delivered in correlated units (complexes). We present a mathematical model of transfection, where a stochastic, two-step process is assumed, with the first being the low-probability entry step of complexes into the nucleus, followed by the subsequent release and activation of a small number of plasmids from a delivered complex. This conceptually simple model consistently predicts the observed fraction of transfected cells, the cotransfection ratio and the expression level distribution. It yields the number of efficient plasmids per complex and elucidates the origin of the associated noise, consequently providing a platform for evaluating and improving non-viral vectors.
description: 20 pages, 6 figures, 12 pages supporting information
Electroweak Phase Transition and LHC Signatures in the Singlet Majoron Model
Creators: name: Cline, James M.
name: Kraml, Sabine
name: Laporte, Guillaume
name: Yamashita, Hiroki
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reconsider the strength of the electroweak phase transition in the singlet Majoron extension of the Standard Model, with a low (~TeV) scale of the singlet VEV. A strongly first order phase transition, of interest for electroweak baryogenesis, is found in sizeable regions of the parameter space, especially when the cross-coupling lambda_{hs}|S|^2|H|^2 between the singlet and the doublet Higgs is significant. Large Majorana Yukawa couplings of the singlet neutrinos, y_i S nu_i^c nu_i, are also important for strengthening the transition. We incorporate the LEP and Tevatron constraints on the Higgs masses, and electroweak precision constraints, in our search for allowed parameters; successful examples include singlet masses ranging from 5 GeV to several TeV. Models with a strong phase transition typically predict a nonstandard Higgs with mass in the range 113 GeV < m_H < 200 GeV and production cross sections reduced by mixing with the singlet, with cos^2(theta) significantly less than 1. We also find examples where the singlet is light and the decay H -> SS can modify the Higgs branching ratios relative to Standard Model expectations.
description: 36 pages, 18 figures
Coronavirus Risk Perception and Social Bias Survey: August 2020
Creators: name: Enns, Peter K.
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Concern about coronavirus (COVID-19) infection (2); bias or mistreatment related to coronavirus (15); President Donald Trump job approval (1); 2020 presidential election (1); worry about coronavirus by racial group in United States (4); racial groups in United States more or less likely to get coronavirus compared to whites in United States (7); agree or disagree with statements about racial minority groups overcoming prejudice (2).
Lepiginosides A-D: three new triterpenoid saponins and a new farnesyl glycoside from the stembarks of Lepisanthes rubiginosa (roxb.) leenh
Creators: name: Zulkifli, Siti Zafirah
name: Ghani, Nurunajah Ab
name: Rasol, Nurulfazlina Edayah
name: Salleh, Wan Mohd Nuzul Hakimi Wan
name: Ismail, Nor Hadiani
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Molecular Biology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Phytochemical investigation of methanolic extract of L. rubiginosa using modern chromatographic techniques has led to the isolation of three new triterpenoid saponins, lepiginosides A-C (1-3), a new farnesyl glycoside, lepiginoside D (4), together with lepisantheside B (5) and gleditsoside C (6). The characterization and structural elucidation of the isolated compounds were established by extensive spectroscopic data analysis and comparison with literature data. Moreover, the antibacterial activity against seven bacteria, but none is active.
Probing condensate order in deep optical lattices
Creators: name: Sun, Kuei
name: Lannert, Courtney
name: Vishveshwara, Smitha
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study interacting bosons in optical lattices in the weak-tunneling regime in systems that exhibit the coexistence of Mott-insulating and condensed phases. We discuss the nature of the condensed ground state in this regime and the validity of the mean-field treatment thereof. We suggest two experimental signatures of condensate order in the system. (1) We analyze the hyperfine configuration of the system and propose a set of experimental parameters for observing radio-frequency spectra that would demonstrate the existence of the condensed phase between Mott-insulating phases. We derive the structure of the signal from the condensate in a typical trapped system, taking into account Goldstone excitations, and discuss its evolution as a function of temperature. (2) We study matter-wave interference patterns displayed by the system upon release from all confining potentials. We show that as the density profiles evolve very differently for the Mott-insulating phase and the condensed phase, they can be distinguished from one another when the two phases coexist.
description: 15 pages, 9 figures, RevTeX; content changed, references changed
Relaxation of hole spins in quantum dots via two-phonon processes
Creators: name: Trif, Mircea
name: Simon, Pascal
name: Loss, Daniel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate theoretically spin relaxation in heavy hole quantum dots in low external magnetic fields. We demonstrate that two-phonon processes and spin-orbit interaction are experimentally relevant and provide an explanation for the recently observed saturation of the spin relaxation rate in heavy hole quantum dots with vanishing magnetic fields. We propose further experiments to identify the relevant spin relaxation mechanisms in low magnetic fields.
description: 5 pages, 2 figures
INVESTIGATION OF RADIATION DAMAGE EFFECTS IN HL-LHC COLLIMATOR MATERIALS
Creators: name: Accettura, Carlotta
Publisher: name: Zenodo
Year: 2021

description: The study of the effects of radiation-matter interaction is of great importance in the nuclear energy industry. Particle physics laboratories operating high-energy and high-intensity particle accelerators developed a growing interest in this field, as the radiation level is increasing with the stored beam energy. The results presented in this work focus on the consequence of radiation damage on accelerators equipment and, in particular, on collimators. This PhD thesis has been carried out at the European Organization for Nuclear Research (CERN), located in Geneva (Switzerland), where the Large Hadron Collider (LHC), the world’s largest accelerator, is operating. The High-Luminosity upgrade of the LHC (HL-LHC) is designed to operate with high-intensity beams, whose stored energy is about 700 MJ. The interaction of particles with collimators induces microscopic defects in the materials, which affect the thermo-physical, electrical and mechanical properties. The evolution of the components during the accelerator lifetime is fundamental to understand if a correct operation can be guaranteed. The aim of this thesis is to study the radiation damage on novel composite materials, specifically developed for HL-LHC collimators. In particular, ion irradiation is used to simulate the effects of protons. The range of the analysed materials includes two grades of molybdenum carbide-graphite composites, one of those is selected as absorber of the new HL-LHC collimators. As a comparison, carbon-fibre-carbon and isotropic polycrystalline graphite are irradiated. The irradiation test is conducted also on some samples coated with metallic films, to simulate the configuration of secondary collimators. The design of the irradiation campaign is presented together with the thermo-mechanical simulations to determine the irradiation temperature. The materials are irradiated at different particle fluences, and the corresponding displacement per atom (dpa) is resented. Each material is irradiated at four or six different levels of dpa, to assess the degradation properties as the irradiation proceed. The experimental part focuses on the measurement of the electrical resistivity relying on the four-probes method. Microscopic investigations are carried out with Raman spectroscopy for graphitic materials, and with FIB-SEM for coatings. The aim of the microstructural analysis is to explain the different behavior of materials under irradiation, and to correlate the changes observed in the electrical resistivity with the microscopic evolution. A comparison between the different materials tested is carried out to understand possible improvements in view of future upgrades of the collimation system. The results presented are then discussed to evaluate the impact on collimators performance and possible mitigation actions.
Isolation and structural characterization of phytoconstituents from leaves of Bignonia binata
Creators: name: Samy, Mamdouh Nabil
name: Mahmoud, Basma Khalaf
name: Hamed, Ashraf Nageeb Elsayed
name: Sugimoto, Sachiko
name: Matsunami, Katsuyoshi
name: Kamel, Mohamed Salah
Publisher: name: Taylor & Francis
Year: 2022
Subjects: Biochemistry
Pharmacology
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified

description: Phytochemical investigation of Bignonia binata leaves led to the isolation of three new compounds: including a glycoside of simple alcohol, namely binatoside (2), 3,4-dihydroxy-N-methyl piperidin-2-one (7), and a phenyl ethanoid glycoside, namely bignanoside C (8), alongside with five known compounds; including a glycoside of simple alcohol; (2S) propane-1,2-diol 1-O-(6-O-caffeoy1)-β-D-glucopyranoside (1), phenyl ethanoids; leucosceptoside A (3) and plantainoside C (4), and iridoids; ipolamiide (5) and strictoloside (6). The structure of the isolated compounds was elucidated by various spectroscopic methods, including 1 D and 2 D NMR experiments, HR-ESI-MS as well as by comparison with the literature.
Critical review of catalysis-assisted nanofiltration for micropollutants removal: Catalytic coupled nanofiltration system vs catalytic nanofiltration membrane
Creators: name: Zhu, Tingting
name: Li, Xin
name: Zhu, Xuewu
name: Liu, Bin
name: Zhu, Junyong
name: Luo, Jianquan
Publisher: name: Taylor & Francis
Year: 2022
Subjects: Biochemistry
Space Science
Environmental Sciences not elsewhere classified
Biological Sciences not elsewhere classified

description: The integration of nanofiltration with catalysis enables high-efficient removal of micropollutants due to its remarkable high selectivity and superior degradation efficacy. Meanwhile, the catalysis-assisted nanofiltration can largely alleviate the issues of inferior low-molecular-weight micropollutants selectivity, membrane fouling and tradeoff limitation. Two different technical routes, catalytic coupled nanofiltration system and catalytic nanofiltration membrane, have been developed based on nanofiltration module and material design for micropollutants separation enhancement. In this review, we first summarize the underlying governing principles of the latest progress of catalysis coupled nanofiltration and catalytic nanofiltration membrane for micropollutants removal. The catalysis and filtration performance of these two routes were initially discussed and compared based on various catalytic oxidation conditions and target substances. We then discussed the corresponding catalytic membrane material innovation and preparation strategies (e.g. coating, bottom-up synthesis, blending, etc.). Finally, we point out the prospects and challenges of catalysis-assisted nanofiltration for micropollutants removal. This review provides directions and guidance for further catalysis-assisted nanofiltration module development and technical industrialization.
La Agresión En El Siglo XXI Integración De Perspectivas Neurobiológicas Y Psicoanalíticas
Creators: name: Paz, Melina
Publisher: name: OSF
Year: 2025
Subjects: subject: Biological Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Este artículo presenta una revisión narrativa sobre la agresión humana desde dos perspectivas teóricas fundamentales: el enfoque psicoanalítico de Freud y la perspectiva neurobiológica de Robert Sapolsky. Se analiza la evolución de la comprensión de la agresión en la literatura científica y se discuten sus implicaciones para la investigación y la intervención psicológica. A partir de una revisión de más de 30 estudios recientes, se evidencia cómo el avance de las neurociencias ha transformado la conceptualización de la agresión, desafiando modelos tradicionales. Se propone un enfoque integrador que contemple la interacción entre factores biológicos, psicológicos y sociales. Finalmente, se sugieren nuevas líneas de investigación en el campo para mejorar la comprensión y el abordaje de la agresión humana.
The generalization of A. E. Kennelly theory of complex representation of the electrical quantities in sinusoidal periodic regime to the one and three-phase electric quantities in non-sinusoidal periodic regime
Creators: name: Mihai, Gheorghe
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In this paper, a new mathematical method of electrical circuits calculus is proposed based on the theory of the complex linear operators in matrix form. The newly proposed method generalizes the theory of complex representation of electrical quantities in sinusoidal periodic regime to the non-sinusoidal periodic regime.
description: 16 pages
The Sunyaev-Zeldovich effect in superclusters of galaxies using gasdynamical simulations: the case of Corona Borealis
Creators: name: Flores-Cacho, I.
name: Rubiño-Martín, J. A.
name: Luzzi, G.
name: Rebolo, R.
name: De Petris, M.
name: Yepes, G.
name: Lamagna, L.
name: De Gregori, S.
name: Battistelli, E. S.
name: Coratella, R.
name: Gottlöber, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: [Abridged] We study the thermal and kinetic Sunyaev-Zel'dovich (SZ) effect associated with superclusters of galaxies using the MareNostrum Universe SPH simulation. We consider superclusters similar to the Corona Borealis Supercluster (CrB-SC). This paper is motivated by the detection at 33GHz of a strong temperature decrement in the CMB towards the core of this supercluster. Multifrequency observations with VSA and MITO suggest the existence of a thermal SZ effect component in the spectrum of this cold spot, which would account for roughly 25% of the total observed decrement. We identify nine regions containing superclusters similar to CrB-SC, obtain the associated SZ maps and calculate the probability of finding such SZ signals arising from hot gas within the supercluster. Our results show that WHIM produces a thermal SZ effect much smaller than the observed value. Neither can summing the contribution of small clusters and galaxy groups in the region explain the amplitude of the SZ signal. When we take into account the actual posterior distribution from the observations, the probability that WHIM can cause a thermal SZ signal like the one observed is <1%, rising up to a 3.2% when the contribution of small clusters and galaxy groups is included. If the simulations provide a suitable description of the gas physics, then we conclude that the thermal SZ component of the CrB spot most probably arises from an unknown galaxy cluster along the line of sight. The simulations also show that the kinetic SZ signal associated with the supercluster cannot provide an explanation for the remaining 75% of the observed cold spot in CrB.
description: Accepted for publication in MNRAS. 14 pages, 9 figures
A Pb - SCI.FI CALORIMETER FOR DAFNE
Creators: name: A. ANTONELLI
name: S. BERTOLUCCI
name: C. BLOISE
name: F. BOSSI
name: P. CAMPANA
name: M. CORDELLI
name: M. CURATOLO
name: B. ESPOSITO
name: S. MISCETTI
name: F. MURTAS
name: G. NICOLETTI
name: V. PATERA
Publisher: name: INFN Open Access Repository
Year: 1991

description: The requirements of a calorimeter for DAPHNE experiments are discussed. An idea based on a sampling calorimeter, with very fine absorbing medium and excellent timing properties, is presented, along with the design parameters and simulation studies of a prototype currently under construction. Preliminary results on timing properties of the active medium (i. e. scintillating fibers) are also given.
A new C19-diterpenoid alkaloid in Aconitum georgei Comber
Creators: name: Yao, Lin-Lin
name: Zhang, Sheng-Qi
name: Guo, Ce
name: Li, Bin-Xian
name: Yang, Hua-Juan
name: Yin, Tian-Peng
name: Cai, Le
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences

description: Nine diterpenoid alkaloids were isolated from Aconitum georgei Comber belonging to the genus Aconitum in Ranunculaceae family. Their structures were determinated by using HR-ESI-MS and 1 D/2D NMR spectra as geordine (1), yunaconitine (2), chasmanine (3), crassicauline A (4), forestine (5), pseudaconine (6), 14-acetylalatisamine (7), austroconitine B (8), and talatisamine (9). Among them, compound 1 is a previously undescribed aconitine-type C19-diterpenoid alkaloid, and compounds 3, and 5-9 have not previously been isolated from this species. The results of in vitro experiments indicated that new compound 1 possesses mild anti-inflammatory activity, which inhibited the production of NO in LPS-activated RAW 264.7 cells with an inhibition ratio of 29.75% at 50 μM.
Effects of Timing It Right on comprehensive unmet needs and psychological pain in patients with radiotherapy
Creators: name: Zhang, Yin-Ping
name: Li, Teng
Publisher: name: figshare
Year: 2021
Subjects: classificationCode: 520303
subject: Counselling psychology
classificationCode: 520304
subject: Health psychology

description: A randomized controlled trial was conducted, and 140 patients with radiotherapy were randomly divided into two groups, with 70 cases in the intervention group and 70 cases in the control group. The intervention group received routine care follow-up and comprehensive nursing mode intervention based on ‘Timing It Right’, while the control group received routine care and follow-up. The comprehensive needs and psychological pain of patients with radiotherapy were compared between before and after the intervention.
The INFN-LNF Space Climatic Facility
Creators: name: D. Arnold
name: G. Bellettini
name: A. Boni
name: C. Cantone
name: I. Ciufolini
name: D. G. Currie
name: S. Dell'Agnello
name: G. O. Delle Monache
name: M. A. Franceschi
name: M. Garattini
name: N. Intaglietta
name: A. Lucantoni
name: M. Martini
name: T. Napolitano
name: A. Paolozzi
name: R. Tauraso
name: R. Vittori
Publisher: name: INFN Open Access Repository
Year: 2008

description: The Space Climatic Facility (SCF) is an experimental apparatus built in 2006 at the Frascati National Laboratory of INFN to study the thermal thrusts acting on the LAGEOS I and II satellites and to perform integrated thermal and optical characterization of retro-reflector (CCR) arrays for laser ranging. The latter include the new LARES satellite, whose main scientific goal is to improve the measurement accuracy of the frame dragging of the Earth (Lense-Thirring effect) predicted by General Relativity and reach a relative accuracy of the order of 1%. The SCF is also devoted to make the same tests on CCR arrays deployed on GNSS constellations (especially on GALILEO) within an approved INFN experiment, ETRUSCO. The SCF is a cylindrical cryostat where a realistic space environment is established in terms of pressure (10-6-10-7 mbar), temperature (down to 77 K) and e.m. radiation (Sun simulator and infrared Earth simulator). Thermal simulations are well advanced and laser-optical simulations are making good progress.
Nuclear Photodisintegration in the Solar Field: Numerical Simulations of the Gerasimova-Zatsepin Effect
Creators: name: P. La Rocca
name: F. Riggi
Publisher: name: INFN Open Access Repository
Year: 2008

description: Numerical simulations of the photodisintegration process of  cosmic nuclei in the photon solar field and of the transport of their charged products in the interplanetary magnetic field have been carried out. The fragmentation probability and the separation between the two fragments have been evaluated as a function of the energy and mass of the primary nucleus, by the use of a realistic model of the interplanetary magnetic field
On the Relation between Rigging Inner Product and Master Constraint Direct Integral Decomposition
Creators: name: Han, Muxin
name: Thiemann, Thomas
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Canonical quantisation of constrained systems with first class constraints via Dirac's operator constraint method proceeds by the thory of Rigged Hilbert spaces, sometimes also called Refined Algebraic Quantisation (RAQ). This method can work when the constraints form a Lie algebra. When the constraints only close with nontrivial structure functions, the Rigging map can no longer be defined. To overcome this obstacle, the Master Constraint Method has been proposed which replaces the individual constraints by a weighted sum of absolute squares of the constraints. Now the direct integral decomposition methods (DID), which are closely related to Rigged Hilbert spaces, become available and have been successfully tested in various situations. It is relatively straightforward to relate the Rigging Inner Product to the path integral that one obtains via reduced phase space methods. However, for the Master Constraint this is not at all obvious. In this paper we find sufficient conditions under which such a relation can be established. Key to our analysis is the possibility to pass to equivalent, Abelian constraints, at least locally in phase space. Then the Master Constraint DID for those Abelian constraints can be directly related to the Rigging Map and therefore has a path integral formulation.
description: 25 pages
The Optical Frequency Comb as a One-Way Quantum Computer
Creators: name: Flammia, Steven T.
name: Menicucci, Nicolas C.
name: Pfister, Oliver
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the one-way model of quantum computing, quantum algorithms are implemented using only measurements on an entangled initial state. Much of the hard work is done up-front when creating this universal resource, known as a cluster state, on which the measurements are made. Here we detail a new proposal for a scalable method of creating cluster states using only a single multimode optical parametric oscillator (OPO). The method generates a continuous-variable cluster state that is universal for quantum computation and encoded in the quadratures of the optical frequency comb of the OPO. This work expands on the presentation in Phys. Rev. Lett. 101, 130501 (2008).
description: 20 pages, 8 figures. v2 corrects minor error in published version