cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A comprehensive study on the semileptonic decay of heavy flavor mesons
Creators: name: Zhang, Lu
name: Kang, Xian-Wei
name: Guo, Xin-Heng
name: Dai, Ling-Yun
name: Luo, Tao
name: Wang, Chao
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The semileptonic decay of heavy flavor mesons offers a clean environment for extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, which describes the CP-violating and flavor changing process in the Standard Model. The involved form factors where the dynamical information is encoded play an essential role in achieving any conclusive statement. That is, the knowledge of the form factors should be under good control, requiring one to examine more observables in addition to the branching fraction. In this paper, we provide the mean value and the $q^2$-dependent shape for further observables [differential decay distribution ($dΓ/dq^2$), forward-backward asymmetry ($\mathcal{A}_{FB}^l$), longitudinal ($P_L^l$) and transverse ($P_T^l$) polarization of a charged lepton, longitudinal polarization of a vector meson in the final state ($F_L^l(V)$), leptonic convexity parameter ($C_F^l$), and trigonometric moments ($W_i^l$) in the decay of $D_{(s)}$ and $B_{(s)}$ to $P/V l^+ ν_l$ ($l=e$, $μ$ or $τ$)], based on the predictions of the relevant form factors from the covariant light-front quark model. $P$ and $V$ denote the pseudoscalar and vector meson, respectively. As a comparison, we find a good agreement with the results from the covariant confining quark model and the relativistic quark model in the literature. As it has been observed that the $P_L^l$ and $F_L^l(V)$ are crucial quantities to discriminate various New Physics models, the reexamination of these observables from a different method is also essential and necessary.
description: final version, will appear in JHEP soon
Localization in the Kicked Ising Chain
Creators: name: Waltner, Daniel
name: Braun, Petr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Determining the border between ergodic and localized behavior is of central interest for interacting many-body systems. We consider here the recently very popular spin-chain model that is periodically excited. A convenient description of such a many-body system is achieved by the dual operator that evolves the system in contrast to the time-evolution operator not in time but in particle direction. We identify in this paper the largest eigenvalue of a function based on the dual operator as a convenient tool to determine if the system shows ergodic or many-body localized features. By perturbation theory in the vicinity of the noninteracting system we explain analytically the eigenvalue structure and compare it with numerics in [P. Braun, D. Waltner, M. Akila, B. Gutkin, T. Guhr, Phys. Rev. E $\bf{101}$, 052201 (2020)] for small times. Furthermore we identify a quantity that allows based on extensive large-time numerical computations of the spectral form factor to distinguish between localized and ergodic system features and to determine the Thouless time, i.e. the transition time between these regimes in the thermodynamic limit.
description: 25 pages, 10 figures
Spin-Polarized Electron Transport through Nanometer-Scale Al Grains
Creators: name: Zhang, L. Y.
name: Wang, C. Y.
name: Wei, Y. G.
name: Liu, X. Y.
name: Davidovic, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate spin-polarized electron tunnelling through ensembles of nanometer scale Al grains embedded between two Co-reservoirs at 4.2K, and observe tunnelling-magnetoresistance (TMR) and effects from spin-precession in the perpendicular applied magnetic field (the Hanle effect). The spin-coherence time ($T_2^\star$) measured using the Hanle effect is of order $ns$. The dephasing is attributed to electron spin-precession in local magnetic fields. Dephasing process does not destroy $TMR$, which is strongly asymmetric with bias voltage. The asymmetric TMR is explained by spin relaxation in Al grains and asymmetric electron dwell times.
description: 4 pages 4 figures
Gauge invariants and Killing tensors in higher-spin gauge theories
Creators: name: Bekaert, Xavier
name: Boulanger, Nicolas
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In free completely symmetric tensor gauge field theories on Minkowski space-time, all gauge invariant functions and Killing tensor fields are computed, both on-shell and off-shell. These problems are addressed in the metric-like formalisms.
description: LaTeX, 24 pages, no figure. One reference added and one definition corrected. Accepted for publication in NPB
Fundamental Limits of the Dispersion of the Two-Photon Absorption Cross-Section
Creators: name: Moreno, Javier Pérez
name: Kuzyk, Mark G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Optics (physics.optics)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We rigorously apply the sum rules to the sum-over-states expression to calculate the fundamental limits of the dispersion of the two-photon absorption cross-section. A comparison of the theory with the data suggests that the truncated sum rules in the three-level model give a reasonable fundamental limit. Our ansatz that the two photon absorption cross-section near the limit must have only three dominant statesis is supported by a rigorous analytical calculation that the resonant term gets smaller as more states are added. We also find that the contributions of the non-explicitly resonant terms can not be neglected when analyzing real molecules with many excited states, even near resonance. However, puzzling as it may be, extrapolating an off-resonant result to resonance using only the resonant term of the three-level model is shown to be consistent with the exact result. In addition, the off-resonant approximation is shown to scale logarithmically when compared with the full three-level model. This scaling can be used to simplify the analysis of measurements. We find that existing molecules are still far from the fundamental limit; so, there is room for improvement. But, reaching the fundamental limit would require precise control of the energy-level spacing, independently of the transition dipole moments -- a task that does not appear possible using today's synthetic approaches. So, we present alternative methods that can still lead to substantial improvements which only require the control of the transition moment to the first excited state. While it is best to normalize measured two photon absorption cross-sections to the fundamental limits when comparing molecules, we show that simply dividing by the square of the number of electrons per molecule yields a good metric for comparison.
description: 14 pages, 12 figures, 4 tables
The vacuum state of quantum gravity contains large virtual masses
Creators: name: Modanese, Giovanni
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In the functional integral approach to quantum gravity, the quantum configurations are usually treated to order hbar through a stationary phase approximation around the saddle point of the action where spacetime is flat. We show that from this point a "level line" in functional space departs, which comprises a family of static non-flat metrics with zero scalar curvature, depending on a continuous mass parameter. Furthermore, each of these metrics can be perturbed by an arbitrary function in such a way to still satisfy the condition Int(gR)d4x=0. We thus find a set of zero-modes of the gravitational action which has non-vanishing measure in the functional space. These metrics will contribute to the functional integral as vacuum fluctuations, on the same footing as those near the saddle point.
description: 13 pages, 4 figures; to appear in Class. Q. Gravity
Betti numbers of holomorphic symplectic quotients via arithmetic Fourier transform
Creators: name: Hausel, Tamas
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Geometry (math.AG)
subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: A Fourier transform technique is introduced for counting the number of solutions of holomorphic moment map equations over a finite field. This in turn gives information on Betti numbers of holomorphic symplectic quotients. As a consequence simple unified proofs are obtained for formulas of Poincare polynomials of toric hyperkahler varieties, Poincare polynomials of Hilbert schemes of points and twisted ADHM spaces of instantons on C^2 and Poincare polynomials of all Nakajima quiver varieties. As an application, a proof of a conjecture of Kac on the number of absolutely indecomposable representations of a quiver is announced.
description: 8 pages, references and an announcement of a proof of a conjecture of Kac are added
Effect of molecular constitution and conformation on positron binding and annihilation in alkanes
Creators: name: Swann, A. R.
name: Gribakin, G. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The model-potential approach previously developed by the authors to study positron interactions with molecules is used to calculate the positron binding energy for $n$-alkanes (C$_n$H$_{2n+2}$) and the corresponding cycloalkanes (C$_n$H$_{2n}$). For $n$-alkanes, the dependence of the binding energy on the conformation of the molecule is investigated, with more compact structures showing greater binding energies. As a result, thermally averaged binding energies for larger alkanes ($n\gtrsim 9$) show a strong temperature dependence in the range of 100-600 K. This suggests that positron resonant annihilation can be used as a probe of rotational (trans-gauche) isomerization of $n$-alkanes. In particular, the presence of different conformers leads to shifts and broadening of vibrational Feshbach resonances in the annihilation rate, as observed with a trap-based low-energy positron beam.
description: 17 pages, 13 figures
Dynamical properties of S=1 bond-alternating Heisenberg chains in transverse magnetic fields
Creators: name: Suzuki, Takahumi
name: Suga, Sei-ichiro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We calculate dynamical structure factors of the S=1 bond-alternating Heisenberg chain with a single-ion anisotropy in transverse magnetic fields, using a continued fraction method based on the Lanczos algorithm. In the Haldane-gap phase and the dimer phase, dynamical structure factors show characteristic field dependence. Possible interpretations are discussed. The numerical results are in qualitative agreement with recent results for inelastic neutron-scattering experiments on the S=1 bond-alternating Heisenberg-chain compound $\rm{Ni(C_{9}D_{24}N_{4})(NO_{2})ClO_{4}}$ and the S=1 Haldane-gap compound $\rm{Ni(C_{5}D_{14}N_{2})_{2}N_{3}(PF_{6})}$ in transverse magnetic fields.
description: 7 pages, 6 figures
New Exact Solutions of Differential Equations Derived by Fractional Calculus
Creators: name: Felber, F. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 34M25; 34M10; 34M05; 34M45

description: Fractional calculus generalizes the derivative and antiderivative operations of differential and integral calculus from integer orders to the entire complex plane. Methods are presented for using this generalized calculus with Laplace transforms of complex-order derivatives to solve analytically many differential equations in physics, facilitate numerical computations, and generate new infinite-series representations of functions. As examples, new exact analytic solutions of differential equations, including new generalized Bessel equations with complex-power-law variable coefficients, are derived.
description: 4 pages, 3 figures, to be published in Applied Mathematics and Computation
Nontrivial temporal scaling in a Galilean stick-slip dynamics
Creators: name: Parteli, E. J. R.
name: Gomes, M. A. F.
name: Brito, V. P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We examine the stick-slip fluctuating response of a rough massive non-rotating cylinder moving on a rough inclined groove which is submitted to weak external perturbations and which is maintained well below the angle of repose. The experiments presented here, which are reminiscent of the Galileo's works with rolling objects on inclines, have brought in the last years important new insights into the friction between surfaces in relative motion and are of relevance for earthquakes, differing from classical block-spring models by the mechanism of energy input in the system. Robust nontrivial temporal scaling laws appearing in the dynamics of this system are reported, and it is shown that the time-support where dissipation occurs approaches a statistical fractal set with a fixed value of dimension. The distribution of periods of inactivity in the intermittent motion of the cylinder is also studied and found to be closely related to the lacunarity of a random version of the classic triadic Cantor set on the line.
description: 7 pages including 6 figures
Phase Space Sampling and Inference from Weighted Events with Autoregressive Flows
Creators: name: Stienen, Bob
name: Verheyen, Rob
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore the use of autoregressive flows, a type of generative model with tractable likelihood, as a means of efficient generation of physical particle collider events. The usual maximum likelihood loss function is supplemented by an event weight, allowing for inference from event samples with variable, and even negative event weights. To illustrate the efficacy of the model, we perform experiments with leading-order top pair production events at an electron collider with importance sampling weights, and with next-to-leading-order top pair production events at the LHC that involve negative weights.
description: 26 pages, 7 figures
Semiclassical Theory of Amplification and Lasing
Creators: name: de Valcarcel, German J.
name: Roldan, Eugenio
name: Prati, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this article we present a systematic derivation of the Maxwell-Bloch equations describing amplification and laser action in a ring cavity. We derive the Maxwell-Bloch equations for a two-level medium and discuss their applicability to standard three- and four-level systems. After discusing amplification, we consider lasing and pay special attention to the obtention of the laser equations in the uniform field approximation. Finally, the connection of the laser equations with the Lorenz model is considered.
description: Didactic article. 16 text pages plus 8 figures. Some typos corrected
Integrability breaking in the one dimensional Bose gas: Atomic losses and energy loss
Creators: name: Hutsalyuk, Arthur
name: Pozsgay, Balázs
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The one dimensional $δ$-function interacting Bose gas (the Lieb-Liniger model) is an integrable system, which can model experiments with ultra cold atoms in one dimensional traps. Even though the model is integrable, integrability breaking effects are always present in the real world experiments. In this work we consider the integrability breaking due to atomic loss, which is the most relevant effect in the experiments. We set up a framework for the exact computation of the losses of the canonical charges of the model, and compute an exact result for the energy loss due to the local $K$-body processes, valid for arbitrary $K$. Our result takes the form of multiple integrals, which are explicitly factorized in the experimentally relevant cases of $K=1,2,3$.
description: 23 pages, v2: references added plus minor changes
[Class elicitation session]
Creators: name: Mukacha, Andrew
name: Granados, Alejandro
name: Lei, Justin
name: Minas, Emil
name: Morales, Mark
name: Schultz, Donald
name: Spingeld, Jeffrey
name: Hyman, Larry M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: Lulamogi language

description: Lexical elicitation
Supersymmetric Solutions of D-Dimensional Dirac Equation for Woods-Saxon Potential in Minimal Length Formalism
Creators: name: Suparmi, A
name: Akbar, J
name: Cari, C
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We obtain the energy eigenvalues and radial wave functions of the D-Dimensional Dirac equation in the case of spin symmetry for Woods-Saxon potential in minimal length formalism. The radial part of the D-Dimensional Dirac equation is solved by applied the supersymmetric quantum mechanics method using the Pekeris approximation to deal with the centrifugal term. The behavior of bound-state energy eigenvalues versus dimension and also quantum number is discussed for various minimal length parameters.
description: International Conference on Physics and Its Applications (ICOPIA 2020)
Studies with plant cell cultures and synthetic chemistry: routes to etoposide
Creators: name: Stoynov, Nikolay Mintchev
Publisher: name: University of British Columbia
Year: 2009

description: The studies presented in this thesis involve investigations in the use of plant cell cultures in combination with synthetic chemistry to provide efficient routes for the synthesis of novel aryltetralin analogues of the podophyllotoxin family as well as intermediates for the synthesis of etoposide (1) and teniposide (2), two important anticancer agents. The present study is also devoted to providing a better understanding with regard to the use of biotransformation by plant cell cultures as a novel tool in the synthesis of podophyllotoxin analogues and closely related lignans. The initial phases involved the use of readily available aromatic aldehydes 226, 280 and 286, which after derivatization were employed in a "one-pot" 1,4-addition-enolate alkylation or 1,4-addition-enolate aldol reaction in the preparation of several dibenzybutanolide analogues, such as 266, 267, 272-279. Although the syntheses to 266 and 267 have been previously established in this laboratory, other intermediates 272 - 279 in the synthesis to 4'- demethylepipodophyllotoxin analogues were required and thus investigated. Further studies of the present research involved biotransformation of dibenzylbutanolides 266, 267, 272, 273, 274, 275 and 276 to analogues of the lignan, 4'-demethylepipodophyllotoxin (16), by means of plant cell cultures from Podophyllum peltatum and Nicotiana sylvestris, as well as horseradish peroxidase enzymes as catalysts in the cyclization reactions of dibenzylbutanolides. The results, obtained from these studies, suggested that compounds bearing a methylene group at C-7" of the basic dibenzylbutanolide skeleton are suitable precursors in the enzyme catalyzed cyclizations to isopodophyllotoxin analogues, 268 and 309, as potentially active antineoplastic agents. In contrast, the presence of a hydroxyl group at C-7" restricted the enzymatic process to partial oxidation and complete suppression of the cyclization process. An alternative approach in the preparation of the aryltetralin compounds of the podophyllotoxin series was achieved by chemical conversion of 277, 278 and 279, utilizing Lewis and protic acids. The products obtained from these experiments possessed either podophyllotoxin (3) or isopodophyllotoxin (52) configuration. The later stages of the present studies concentrated on the preparation of compounds 6 and 331, bearing the 4'-demethylpodophyllotoxin (6) configuration, represented in the Etoposide (1) molecule. [Figures.]
Manually Tunable Ventilated Metamaterial Absorbers
Creators: name: Xiao, Xiang
name: Tian, Hongxing
name: Huang, Yingzhou
name: Wu, Xiaoxiao
name: Wen, Weijia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: For most acoustic metamaterials, once they have been fabricated, their operating frequencies and functions cannot be adjusted, which is an intrinsic barrier for development of realistic applications. The study to overcome this limit has become a significant issue in acoustic metamaterial engineering. Although with the advance of metamaterials in the past two decades, a series of methods such as electric or magnetic control have been proposed, most of them can only work in the condition of no fluid passage. Some metamaterials with large transmission losses have been proposed, but the sounds are essentially reflected rather than absorbed. Here, to overcome this intrinsic difficulty, we propose a ventilated sound absorber that can be manually tuned in a large range after being manufactured. During the tuning which is achieved through an intricately designed slider, high-performance absorption and ventilation are both ensured. The tunable ventilated sound absorber is demonstrated experimentally and the effective model of coupled lossy oscillators can be employed to understand its mechanism. The manually tunable ventilated metamaterial has the potential application values in various complicated pipe systems that require frequency adjustment and it also establishes the foundation for future development of active tunable ventilated acoustic metamaterials.
Massless and Massive Three Dimensional Super Yang-Mills Theory and Mini-Twistor String Theory
Creators: name: Chiou, Dah-Wei
name: Ganor, Ori J.
name: Hong, Yoon Pyo
name: Kim, Bom Soo
name: Mitra, Indrajit
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose various ways of adding mass terms to three-dimensional twistor string theory. We begin with a review of mini-twistor space--the reduction of D=4 twistor space to D=3. We adapt the two proposals for twistor string theory, Witten's and Berkovits's, to D=3 super Yang-Mills theory. In Berkovits's model, we identify the enhanced R-symmetry. We then construct B-model topological string theories that, we propose, correspond to D=3 Yang-Mills theory with massive spinors and massive and massless scalars in the adjoint representation of the gauge group. We also analyze the counterparts of these constructions in Berkovits's model. Some of our constructions can be lifted to D=4, where infinitesimal mass terms correspond to VEVs of certain superconformal gravity fields.
description: 69 pages; Typos corrected
Weibull, κ-Weibull and 3-parameter extended Weibull distributions
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2022
Subjects: κ-Weibull distribution
Weibull distribution
3-parameter extended Weibull distribution
Marshall–Olkin extended distributions
Log-logistic distribution
Hazard function
Modeling failure times

description: Here we will consider a function of κ-statistics, the κ-Weibull distribution, and compare it to the well-known Weibull distribution. The κ-Weibull will be also compared to the 3-parameter extended Weibull function, obtained according to the Marshall–Olkin extended distributions. The log-logistic distribution will be considered for comparison too. The most important observation, coming from the proposed calculations, is that the κ-Weibull hazard function is strongly depending on the values of parameter κ, a parameter which is deeply influencing the behaviour of the tail of the probability distribution. As a consequence, the κ-Weibull function turns out to be quite relevant for generalizations of the Weibull approach to modeling failure times. 
On the impact of baryons on the halo mass function, bias, and cluster cosmology
Creators: name: Castro, Tiago
name: Borgani, Stefano
name: Dolag, Klaus
name: Marra, Valerio
name: Quartin, Miguel
name: Saro, Alex
name: Sefusatti, Emiliano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Luminous matter produces very energetic events, such as active galactic nuclei and supernova explosions, that significantly affect the internal regions of galaxy clusters. Although the current uncertainty in the effect of baryonic physics on cluster statistics is subdominant as compared to other systematics, the picture is likely to change soon as the amount of high-quality data is growing fast, urging the community to keep theoretical systematic uncertainties below the ever-growing statistical precision. In this paper, we study the effect of baryons on galaxy clusters, and their impact on the cosmological applications of clusters, using the Magneticum suite of cosmological hydrodynamical simulations. We show that the impact of baryons on the halo mass function can be recast in terms on a variation of the mass of the halos simulated with pure N-body, when baryonic effects are included. The halo mass function and halo bias are only indirectly affected. Finally, we demonstrate that neglecting baryonic effects on halos mass function and bias would significantly alter the inference of cosmological parameters from high-sensitivity next-generations surveys of galaxy clusters.
description: v2: matches published version. 22 pages, 17 figures
Ising Ferromagnet: Zero-Temperature Dynamic Evolution
Creators: name: de Oliveira, P. M. C.
name: Newman, C. M.
name: Sidoravicious, V.
name: Stein, D. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The dynamic evolution at zero temperature of a uniform Ising ferromagnet on a square lattice is followed by Monte Carlo computer simulations. The system always eventually reaches a final, absorbing state, which sometimes coincides with a ground state (all spins parallel), and sometimes does not (parallel stripes of spins up and down). We initiate here the numerical study of ``Chaotic Time Dependence'' (CTD) by seeing how much information about the final state is predictable from the randomly generated quenched initial state. CTD was originally proposed to explain how nonequilibrium spin glasses could manifest equilibrium pure state structure, but in simpler systems such as homogeneous ferromagnets it is closely related to long-term predictability and our results suggest that CTD might indeed occur in the infinite volume limit.
description: 14 pages, Latex with 8 EPS figures
Exploring the Lower Mass Function in the young open Cluster IC 4665
Creators: name: de Wit, W. J.
name: Bouvier, J.
name: Palla, F.
name: Cuillandre, J. -C.
name: James, D. J.
name: Kendall, T. R.
name: Lodieu, N.
name: McCaughrean, M. J.
name: Moraux, E.
name: Randich, S.
name: Testi, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the young (30-100Myr) open cluster IC 4665 with the aim to determine the shape of the mass function well into the brown dwarf regime. We photometrically select 691 low-mass stellar and 94 brown dwarf candidate members over an area of 3.82 square degrees centred on the cluster. K-band follow-up photometry and Two-Micron All-Sky Survey data allow a first filtering of contaminant objects from our catalogues. A second filtering is performed for the brightest stars using proper motion data provided by the Tycho-2 and UCAC2 public catalogues. Contamination by the field population for the lowest mass objects is estimated using same latitude control fields. We fit observed surface densities of various cluster populations with King profiles and find a consistent tidal radius of 1.0 degree. The presence of possible mass segregation is discussed. In most respects investigated, IC 4665 is similar to other young open clusters at this age: (1) a power law fit to the mass function between 1 and 0.04Msun results in best fit for a slope of -0.6; (2) a cusp in the mass function is noticed at about the substellar boundary with respect to the power law description, the interpretation of which is discussed; (3) a fraction between 10-19% for BDs with M > 0.03Msun to total members; (4) a best-fit lognormal function to the full mass distribution shows an average member mass of 0.32Msun, if IC 4665 has an age of 50Myr.
description: 14 pages, 13 figures. Accepted for publication in A&A. Catalogue with candidate members at CDS
Domain walls and CP violation with left right supersymmetry:implications for leptogenesis and electron EDM
Creators: name: Banerjee, Piyali
name: Yajnik, Urjit
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Low scale leptogenesis scenarios are difficult to verify due to our inability to relate the parameters involved in the early universe processes with the low energy or collider observables. Here we show that one can in principle relate the parameters giving rise to the transient $CP$ violating phase involved in leptogenesis with those that can be deduced from the observation of electric dipole moment (EDM) of the electron. We work out the details of this in the context of the left right symmetric supersymmetric model (LRSUSY) which provides a strong connection between such parameters. In particular, we show that baryon asymmetry requirements imply the scale $M_{B-L}$ of $U(1)_{B-L}$ symmetry breaking to be larger than $10^{4.5}~\mathrm{GeV}$. Moreover the scale $M_R$ of $SU(2)_R$ symmetry breaking is tightly constrained to lie in a narrow band significantly below $M_{B-L}^2 / M_{EW}$. These are the most stringent constraints on the parameter space of LRSUSY model being considered.
description: 32 pages, second version contains more discussion of the temperature dependence of the mass matrix in a new Appendix B
A numerical study of a cold-mode fluidized bed reactor designed for pyrolysis of plastics
Creators: name: Zhang, Feichi
name: Tavakkol, Salar
name: Dercho, Stefan
name: Bohlender, Lukas
name: Zirwes, Thorsten
name: Zeller, Michael
name: Vogt, Jonas
name: Stapf, Dieter
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2023

description: Numerical simulations have been conducted for a cylindrical, laboratory-scale fluidized bed reactor, which has been designed for fundamental research of plastic pyrolysis. The Euler-Lagrange multiphase particle-in-cell (MP-PIC) approach has been used for modeling the dense particle-load flow. As the performance of the fluidized bed heavily relies on the interaction between gas and particles, the cold flow model considering only inert quartz sand particles as bed material and nitrogen as fluidizing agent at atmospheric condition has been applied in this work. The objective of this work is to study the hydrodynamic behaviors of the fluidized bed, which is of significant importance for an efficient mixing between the bed materials in terms of heat and mass transfer.
In accordance with the experiment, the simulations have shown the bubbling fluidization regime in most considered cases, showing intermittently rising bubbles from the ground of the reactor to the upper surface of the fluidized bed. The calculated pressure drop Δp yields a good agreement with measured data, which remains constant with varied superficial gas velocity uG and increases with the bed inventory mS. The bed height hB increases slightly with increased uG due to the formation of larger bubbles. In addition, hB increases almost proportionally with mS due to the higher amount of sand mass.
While up-scaling the reactor at constant Δp and uG, the fluidized bed is dominated by large-scale bubbles for relatively small reactor diameters at dR = 3 cm and 5 cm, where the bubbles have a similar size compared with dR. However, multiple-column bubbles rising along off-centered axes have been detected for further up-scaled reactor with dR = 10 cm. In this case, the parallelly rising large-scale bubbles results in a recirculation of the gas flow and accumulation of the sand particles along the centerline axis, leading to an improved mixing. In summary, the simulations are able to reproduce the behavior of the fluidized bed observed in the experiments, which confirms the validity of the used computational approach. The correlations between the operational characteristics and the operating parameters obtained from the simulations can be used for further optimized design of the fluidized bed, e.g., concerning scale-up of the reactor.
RFI Identification and Mitigation Using Simultaneous Dual Station Observations
Creators: name: Bhat, N. D. R.
name: Cordes, J. M.
name: Chatterjee, S.
name: Lazio, T. J. W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: RFI mitigation is a critically important issue in radio astronomy using existing instruments as well as in the development of next-generation radio telescopes, such as the Square Kilometer Array (SKA). Most designs for the SKA involve multiple stations with spacings of up to a few thousands of kilometers and thus can exploit the drastically different RFI environments at different stations. As demonstrator observations and analysis for SKA-like instruments, and to develop RFI mitigation schemes that will be useful in the near term, we recently conducted simultaneous observations with Arecibo Observatory and the Green Bank Telescope (GBT). The observations were aimed at diagnosing RFI and using the mostly uncorrelated RFI between the two sites to excise RFI from several generic kinds of measurements such as giant pulses from Crab-like pulsars and weak HI emission from galaxies in bands heavily contaminated by RFI. This paper presents observations, analysis, and RFI identification and excision procedures that are effective for both time series and spectroscopy applications using multi-station data.
description: 12 pages, 9 figures (4 in ps and 5 in jpg formats), Accepted for publication in Radio Science
Schütz, Joseph: die Lehrer der Slawen Kyrill und Method
Creators: name: Ohme, Heinz
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 2 (1987): Ökumenische Rundschau, Band 36, Heft 2
Knot theory and a physical state of quantum gravity
Creators: name: Liko, Tomas
name: Kauffman, Louis H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the theory of knots, and describe how knot invariants arise naturally in gravitational physics. The focus of this review is to delineate the relationship between knot theory and the loop representation of non-perturbative canonical quantum general relativity (loop quantum gravity). This leads naturally to a discussion of the Kodama wavefunction, a state which is conjectured to be the ground state of the gravitational field with positive cosmological constant. This review can serve as a self-contained introduction to loop quantum gravity and related areas. Our intent is to make the paper accessible to a wider audience that may include topologists, knot-theorists, and other persons innocent of the physical background to this approach to quantum gravity.
description: 37 pages, 4 figures; review paper; v2: typos corrected and references added; v3: extensively rewritten and corrected; introduction to conformal field theory added; Appendix D removed; version without Appendices B and C to appear in Classical and Quantum Gravity
Non-Reciprocal Interactions Induced by Water in Confinement
Creators: name: Jimenez-Angeles, Felipe
name: Harmon, Katherine J.
name: Nguyen, Trung Dac
name: Fenter, Paul
name: de la Cruz, Monica Olvera
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Water mediates electrostatic interactions via the orientation of its dipoles around ions, molecules, and interfaces. This induced water polarization consequently influences multiple phenomena. In particular, water polarization modulated by nanoconfinement affects ion adsorption and transport, biomolecular self-assembly, and surface chemical reactions. Therefore, it is of paramount importance to understand how water-mediated interactions change at the nanoscale. Here we show that near the graphene surface anion-cation interactions do not obey the translational and isotropic symmetries of Coulomb's law. We identify a new property, referred to as non-reciprocity, which describes the non-equivalent and directional interaction between two oppositely charged ions near the confining surface when their positions with respect to the interface are exchanged. Specifically, upon exchange of the two ions' positions along the surface normal direction the interaction energy changes by about 5$k_BT$. In both cases, confinement enhances the attraction between two oppositely charged ions near the graphene surface, while intercalation of one ion into the graphene layers shifts the interaction to repulsive. While the water permittivity in confinement is different from that in bulk, the effects observed here via molecular dynamics simulations and X-ray reflectivity experiments cannot be accounted for by current permittivity models. Our work shows that the water structure is not enough to infer electrostatic interactions near interfaces.
description: 18 pages, 13 figures, Accepted in Physical Review Research
[Small-group elicitation sessions]
Creators: name: Mukacha, Andrew
name: Bothfeld, Sarah
name: Faytak, Matthew
name: Granados, Alejandro
name: Hyman, Larry M.
name: Lei, Justin
name: Minas, Emil
name: Morales, Mark
name: Rolle, Nicholas
name: Spingeld, Jeffrey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: Lulamogi language

description: Lexical elicitation
Activity spectrum from waiting-time distribution
Creators: name: Politi, Mauro
name: Scalas, Enrico
Publisher: name: arXiv
Year: 2008
Subjects: subject: Trading and Market Microstructure (q-fin.TR)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: In high frequency financial data not only returns but also waiting times between trades are random variables. In this work, we analyze the spectra of the waiting-time processes for tick-by-tick trades. The numerical problem, strictly related with the real inversion of Laplace transforms, is analyzed by using Tikhonov's regularization method. We also analyze these spectra by a rough method using a comb of Dirac's delta functions.
description: 8 pages, 5 figures
Collider Phenomenology: Basic Knowledge and Techniques
Creators: name: Han, Tao
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: This is the writeup for TASI--04 lectures on Collider Phenomenology. These lectures are meant to provide an introductory presentation on the basic knowledge and techniques for collider physics. Special efforts have been made for those theorists who need to know some experimental issues in collider environments, and for those experimenters who would like to know more about theoretical considerations in searching for new signals at colliders.
description: 51 pages, 15 figures, TASI-2004 Lectures
Anomaly Cancellations in Brane Tilings
Creators: name: Imamura, Yosuke
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We re-interpret the anomaly cancellation conditions for the gauge symmetries and the baryonic flavor symmetries in quiver gauge theories realized by the brane tilings from the viewpoint of flux conservation on branes.
description: 10 pages, LaTeX; v2: minor corrections, a note on the zero-form flux added
title: Dr. Max Hintermann zum Gedenken
title: 11. Mai 1901 - 18. Mai 1971
titleType: Subtitle
title: Gedenkfeier im Münster Schaffhausen, Montag, den 24 Mai 1971
titleType: Subtitle
Creators: name: Kuster, Walter
name: Uhlmann, Ernst
name: Meyer, E.
Publisher: name: Gedenkschriften-Verlag
Year: 1972
Subjects: subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Hintermann, Max
subject: Schaffhausen

description: Enthält verschiedene Ansprachen bei der Trauerfeier.
Complex reaction noise in molecular quasispecies model
Creators: name: Hochberg, David
name: Zorzano, Maria-Paz
name: Moran, Federico
Publisher: name: arXiv
Year: 2006
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We have derived exact Langevin equations for a model of quasispecies dynamics. The inherent multiplicative reaction noise is complex and its statistical properties are specified completely. The numerical simulation of the complex Langevin equations is carried out using the Cholesky decomposition for the noise covariance matrix. This internal noise, which is due to diffusion-limited reactions, produces unavoidable spatio-temporal density fluctuations about the mean field value. In two dimensions, this noise strictly vanishes only in the perfectly mixed limit, a situation difficult to attain in practice.
description: 10 pages, 2 figures, uses elstart class file
(CR 27) Hepatic Mesenchymal Hamartoma- A Rare Benign Developmental Tumour
Creators: name: Divann Esvaran
Publisher: name: Zenodo
Year: 2022

description: Introduction: Hepatic mesenchymal hamartoma (HMH) is a rare benign pediatric hepatic tumor that derives from mesenchymal tissue. It is of uncertain etiology with majority of cases in less than 2 years of age. The diagnosis is a challenge with its non-specific clinical symptoms and lack of definitive laboratory studies; hence, radiological imaging is crucial for diagnosis. Case Presentation: We report a case study of a 2-year-old boy presented with abdominal distension for 2 months, gradually increasing in size. A right sided intra-abdominal mass was palpable with sonographic correlation of a large multicystic lesion in the right hypochondrium. Hematological and biochemical investigations were within normal limits. Alpha-fetoprotein and B-HCG values were unremarkable. Contrast enhanced CT showed a large multiseptated cystic mass measuring 12.3cm x 12.7cm x 15.6cm in right liver lobe. Patient was planned for laparotomy and extended right hepatectomy with intra-operative findings of a large cystic mass occupying the right liver lobe weighing 1240 grams. A histological diagnosis of HMH was made based on distinctive morphological features. The patient recovered well post-operatively and was discharged home. Conclusion: HMH is a benign childhood tumour with mean age of presentation of 20 months. Mesenchymal hamartomas originate from a congenital localized abnormality in ductal plate development. The diagnosis of these tumors are often delayed with diagnostic precision relying on radiological characterization and histological evaluation of the tissue. Radical surgical excision is the gold standard treatment option to prevent cases of local recurrence and possible malignant transformation.
Empfehlungen der Ständigen Impfkommission beim RobertKoch-Institut – 2019/2020
Creators: name: Ständige Impfkommission
Publisher: name: Robert Koch-Institut
Year: 2019
Subjects: subject: STIKO
subject: Impfungen
subject: Impfempfehlungen
subject: Prophylaxe
subject: Impfkalender
subject: 610 Medizin und Gesundheit

description: Die Ständige Impfkommission (STIKO) hat ihre neuen Impfempfehlungen im Epidemiologischen Bulletin 34/2019 veröffentlicht. Die wesentliche Neuerung ist bereits in der Ausgabe 50/2018 veröffentlicht worden: Die STIKO empfiehlt allen Personen ab 60 Jahre die Gürtelrose-Schutzimpfung mit einem sogenannten Totimpfstoff als Standardimpfung. Personen mit einer Grundkrankheit oder Immunschwäche sollen sich bereits ab 50 Jahren impfen lassen (Indikationsimpfung). Die Ausgabe 34 enthält den aktuellen Impfkalender für Kinder und die Übersicht aller Standard-, Indikations- und Auffrischungsimpfungen für Erwachsene. Zudem gibt die STIKO wie in den Vorjahren Hinweise zur Durchführung von Schutzimpfungen, Empfehlungen zu Nachholimpfungen und informiert über postexpositionelle Impfungen und andere Maßnahmen der spezifischen Prophylaxe. Die aktuellen Empfehlungen sind im Internet abrufbar, sie werden auch im Pocket-Format veröffentlicht und können über die STIKO-App aufgerufen werden.
Some Weighted Estimates on Gaussian Measure Spaces
Creators: name: Di, Boning
name: He, Qianjun
name: Yan, Dunyan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 42B35, Secondary 42B20, 42B25

description: In this paper, we obtain the weighted boundedness for the local multi(sub)linear Hardy-Littlewood maximal operators and local multilinear fractional integral operators associated with the local Muckenhoupt weights on Gaussian measure spaces. We deal with these problems by introducing a new pointwise equivalent "radial" definitions of these local operators. Moreover using a similar approach, we also get the weighted boundedness for the local fractional maximal operators with rough kernel and local fractional integral operators with rough kernel on Gaussian measure spaces.
description: 17 pages
Synchronization in Random Geometric Graphs
Creators: name: Diaz-Guilera, Albert
name: Gomez-Gardenes, Jesus
name: Moreno, Yamir
name: Nekovee, Maziar
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper we study the synchronization properties of random geometric graphs. We show that the onset of synchronization takes place roughly at the same value of the order parameter that a random graph with the same size and average connectivity. However, the dependence of the order parameter with the coupling strength indicates that the fully synchronized state is more easily attained in random graphs. We next focus on the complete synchronized state and show that this state is less stable for random geometric graphs than for other kinds of complex networks. Finally, a rewiring mechanism is proposed as a way to improve the stability of the fully synchronized state as well as to lower the value of the coupling strength at which it is achieved. Our work has important implications for the synchronization of wireless networks, and should provide valuable insights for the development and deployment of more efficient and robust distributed synchronization protocols for these systems.
description: 5 pages, 4 figures
INNOVATSION TEXNOLOGIYALARNI RIVOJLANTIRISHNING PSIXOLOGIK ASPEKTLARI.
Creators: name: Sultanqulova G.F., Mastonova Y.
Publisher: name: Zenodo
Year: 2025

description: Annotatsiya: Ushbu maqolada umumiy psixodiagnostika fanini o‘qitishda innovatsion pedagogik va axborot kommunikatsion texnologiyalardan foydalanishning o‘ziga xos xususiyatlari ochib berilgan.