cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Note on the Relationship between Sunspot Numbers and Active Days
Creators: name: Vaquero, J. M.
name: Gutiérrez-López, S.
name: Szelecka, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have studied the relationship between three different versions of the sunspot number (Group, International and American sunspot number) and the number of active days (i.e., the number of days with spots on the solar disk). We have detected an approximately linear relationship for low solar activity conditions. However, this relationship for the International sunspot number is very different to the ones obtained with the other versions of the sunspot number. The discordant values correspond to older observations.
description: 9 pages, 2 figures, accepted for publication in Advances in Space Research
A glance at the host galaxy of high-redshift quasars using strong damped Lyman-alpha systems as coronagraphs
Creators: name: Finley, Hayley
name: Petitjean, Patrick
name: Pâris, Isabelle
name: Noterdaeme, Pasquier
name: Brinkmann, Jonathan
name: Myers, Adam D.
name: Ross, Nicholas P.
name: Schneider, Donald P.
name: Bizyaev, Dmitry
name: Brewington, Howard
name: Ebelke, Garrett
name: Malanushenko, Elena
name: Malanushenko, Viktor
name: Oravetz, Daniel
name: Pan, Kaike
name: Simmons, Audrey
name: Snedden, Stephanie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We searched quasar spectra from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) for the rare occurrences where a strong damped Lyman-alpha absorber (DLA) blocks the Broad Line Region emission from the quasar and acts as a natural coronagraph to reveal narrow Lyα emission from the host galaxy. We define a statistical sample of 31 DLAs in Data Release 9 (DR9) with log N(HI) > 21.3 cm^-2 located at less than 1500 km s^-1 from the quasar redshift. In 25% (8) of these DLAs, a strong narrow Lyα emission line is observed with flux ~25 x 10^-17 erg s^-1 cm^-2 on average. For DLAs without this feature in their troughs, the average 3-σ upper limit is < 0.8 x 10^-17 erg s^-1 cm^-2. Our statistical sample is nearly 2.5 times larger than the anticipated number of intervening DLAs in DR9 within 1500 km s^-1 of the quasar redshift. We also define a sample of 26 DLAs from DR9 and DR10 with narrow Lyα emission detected and no limit on the HI column density to better characterize properties of the host galaxy emission. Analyzing the statistical sample, we do not find substantial differences in the kinematics, metals, or reddening for the two populations with and without emission detected. The highly symmetric narrow Lyα emission line profile centered in the HI trough indicates that the emitting region is separate from the absorber. The luminosity of the narrow Lyα emission peaks is intermediate between that of Lyman-alpha emitters and radio galaxies, implying that the Lyα emission is predominantly due to ionizing radiation from the AGN. Galaxies neighboring the quasar host are likely responsible for the majority (> 75%) of these DLAs, with only a minority (< 25%) arising from HI clouds located in the AGN host galaxy.
description: 18 pages, 23 figures. Accepted for publication in A&A
Realizing Chemical Codoping in Oxide Semiconductors
Creators: name: Wang, Fang
name: Sun, Y. Y.
name: Hatch, John B.
name: Xing, Hui
name: Zhang, Hongwang
name: Xu, Xiaohong
name: Luo, Hong
name: Zhang, S. B.
name: Zeng, Hao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate experimentally a chemical codoping approach that would simultaneously narrow the band gap and control the band edge positions of oxide semiconductors. Using TiO2 as an example, we show that a sequential doping scheme with nitrogen (N) leading the way, followed by phosphorous (P), is crucial for the incorporation of both N and P into the anion sites. Various characterization techniques confirm the formation of the N-P bonds, and as a consequence of the chemical codoping, the band gap of the TiO2 is reduced from 3.0 eV to 1.8 eV. The realization of chemical codoping could be an important step forward in improving the general performance of electronic and optoelectronic materials and devices.
The kinetics of the ice-water interface from ab initio machine learning simulations
Creators: name: de Hijes, Pablo Montero
name: Romano, Salvatore
name: Gorfer, Alexander
name: Dellago, Christoph
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Molecular simulations employing empiric force fields have provided valuable knowledge about the ice growth process in the last decade. The development of novel computational techniques allows us to study this process, which requires long simulations of relatively large systems, with ab initio accuracy. In this work, we use a neural-network potential for water trained on the Revised Perdew-Burke-Ernzerhof functional to describe the kinetics of the ice-water interface. We study both ice melting and growth processes. Our results for the ice growth rate are in reasonable agreement with previous experiments and simulations. We find that the kinetics of ice melting presents a different behavior (monotonic) than that of ice growth (non-monotonic). In particular, a maximum in the ice growth rate of 6.5 Å/ns is found at 14 K of supercooling. The effect of the surface structure is explored by investigating the basal and primary and secondary prismatic facets. We use the Wilson-Frenkel relation to explain these results in terms of the mobility of molecules and the thermodynamic driving force. Moreover, we study the effect of pressure by complementing the standard isobar with simulations at negative pressure (-1000 bar) and at high pressure (2000 bar). We find that prismatic facets grow faster than the basal one, and that pressure does not play an important role when the speed of the interface is considered as a function of the difference between the melting temperature and the actual one, i.e. to the degree of either supercooling or overheating.
A sparse representation of gravitational waves from precessing compact binaries
Creators: name: Blackman, Jonathan
name: Szilagyi, Bela
name: Galley, Chad R.
name: Tiglio, Manuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Many relevant applications in gravitational wave physics share a significant common problem: the seven-dimensional parameter space of gravitational waveforms from precessing compact binary inspirals and coalescences is large enough to prohibit covering the space of waveforms with sufficient density. We find that by using the reduced basis method together with a parametrization of waveforms based on their phase and precession, we can construct ultra-compact yet high-accuracy representations of this large space. As a demonstration, we show that less than $100$ judiciously chosen precessing inspiral waveforms are needed for $200$ cycles, mass ratios from $1$ to $10$ and spin magnitudes $\le 0.9$. In fact, using only the first $10$ reduced basis waveforms yields a maximum mismatch of $0.016$ over the whole range of considered parameters. We test whether the parameters selected from the inspiral regime result in an accurate reduced basis when including merger and ringdown; we find that this is indeed the case in the context of a non-precessing effective-one-body model. This evidence suggests that as few as $\sim 100$ numerical simulations of binary black hole coalescences may accurately represent the seven-dimensional parameter space of precession waveforms for the considered ranges.
description: 5 pages, 3 figures. The parameters selected for the basis of precessing waveforms can be found in the source files
Chrysotoxum tricinctum Rondani 1845
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Chrysotoxum
Chrysotoxum tricinctum

description: Chrysotoxum tricinctum Rondani, 1845
ORIGINAL DESCRIPTION: 1845e: 196 (key), 201 (description).
TYPE LOCALITY: Rossi (1790: 287) gave no type locality in the redescription of Syrphus bicinctus (Linnaeus, 1758), but presumably it is Tuscany (Italy) because the work deals with insects “ in provinciis Florentina et Pisana collegit [collected in provinces of Florence and Pisa]”; “ in agri Parmensis collibus subapenninis [Parmese sub- Apennine hills (Italy)]” (Rondani 1845e: 201) [type locality for Chrysotoxum tricinctum Rondani, 1845].
TYPE MATERIAL: 2 ♀♀, syntypes (MZUF: Box 7): Chrysotoxum Mgn / tricinctum Rnd. v. bicincti? ♀ / 349; 1 ♀, syntype (MZUF: Box B): Chrysotoxum tricinctum R., 127, ♂ ♀, Parma / 393 127; 1 ♀, syntype (missing head) (MSNC: Box DIPTERA Ex collezione Rondani - I): Chrysotoxum tricinctum Rnd. ♀ Parm. / Coll. Rondani, scatola n° 4, posiz. D-9 / Museo di Storia Naturale Università di Pisa, Calci (PI) ex collezione Rondani; 1 ♀, syntype (MZUB, Box 322): 21 43 / Chrysotoxum tricinctum Rond., ex a. parmensi.
CURRENT STATUS: junior synonym of Chrysotoxum bicinctum (Linnaeus, 1758) (Peck 1988: 57, Belcari et al. 1995a: 9).
REMARKS: Rondani (1845e: 201) proposed Chrysotoxum tricinctum for Syrphus bicinctus (Linnaeus, 1758) sensu Rossi (1790: 287), which he considered a new species. Rondani referred to Rossi’s redescription of Syrphus bicinctus, which were based on an unspecified number of specimens, and to five females in his collection: “ quinque tantum feminae hujus speciei … sed mares numquam [only five females of this species … but never the male]”. Therefore, the type material should be in the collections of Rossi and Rondani. According to Poggi & Conci (1996: 100) and Horn et al. (1990: 333), Rossi’s collection should be in the MNHUB. We found five syntypes in this study. No specimen under the name Syrphus bicinctus is present in the MNHUB (J. Pohl, pers. comm., December 2019). Not included in the type series are five males because of their sex: three in the MZUF (Box 7 and Box B), one in the MSNC, one in the MSNPV and one in the MZUB.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 243, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Viscous Kelvin-Helmholtz instabilities in highly ionised plasmas
Creators: name: Roediger, E.
name: Kraft, R. P.
name: Nulsen, P.
name: Churazov, E.
name: Forman, W.
name: Brueggen, M.
name: Kokotanekova, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Transport coefficients in highly ionised plasmas like the intra-cluster medium (ICM) are still ill-constrained. They influence various processes, among them the mixing at shear flow interfaces due to the Kelvin-Helmholtz instability (KHI). The observed structure of potential mixing layers can be used to infer the transport coefficients, but the data interpretation requires a detailed knowledge of the long-term evolution of the KHI under different conditions. Here we present the first systematic numerical study of the effect of constant and temperature-dependent isotropic viscosity over the full range of possible values. We show that moderate viscosities slow down the growth of the KHI and reduce the height of the KHI rolls and their rolling-up. Viscosities above a critical value suppress the KHI. The effect can be quantified in terms of the Reynolds number Re = Uλ/ν, where U is the shear velocity, λ the perturbation length, and ν the kinematic viscosity. We derive the critical Re for constant and temperature dependent, Spitzer-like viscosities, an empirical relation for the viscous KHI growth time as a function of Re and density contrast, and describe special behaviours for Spitzer-like viscosities and high density contrasts. Finally, we briefly discuss several astrophysical situations where the viscous KHI could play a role, i.e., sloshing cold fronts, gas stripping from galaxies, buoyant cavities, ICM turbulence, and high velocity clouds.
description: Accepted by MNRAS. 22 pages, 21 figures
High-mobility graphene on liquid p-block elements by ultra-low-loss CVD growth
Creators: name: Wang, Jiao
name: Zeng, Mengqi
name: Tan, Lifang
name: Dai, Boya
name: Deng, Yuan
name: Rümmeli, Mark
name: Xu, Haitao
name: Li, Zishen
name: Wang, Sheng
name: Peng, Lianmao
name: Eckert, Jürgen
name: Fu, Lei
Publisher: name: London : Nature Publishing Group
Year: 2013
Subjects: subject: Electronic devices
subject: Synthesis of graphene
subject: 620

description: The high-quality and low-cost of the graphene preparation method decide whether graphene is put into the applications finally. Enormous efforts have been devoted to understand and optimize the CVD process of graphene over various d-block transition metals (e.g. Cu, Ni and Pt). Here we report the growth of uniform high-quality single-layer, single-crystalline graphene flakes and their continuous films over p-block elements (e.g. Ga) liquid films using ambient-pressure chemical vapor deposition. The graphene shows high crystalline quality with electron mobility reaching levels as high as 7400 cm2 V−1s−1 under ambient conditions. Our employed growth strategy is ultra-low-loss. Only trace amounts of Ga are consumed in the production and transfer of the graphene and expensive film deposition or vacuum systems are not needed. We believe that our research will open up new territory in the field of graphene growth and thus promote its practical application.
Effect of Temperature and Charged Particle Fluence on the Resistivity of Polycrystalline CVD Diamond Sensors
Creators: name: Wang, Rui
name: Hoeferkamp, Martin
name: Seidel, Sally
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The resistivity of polycrystalline chemical vapor deposition diamond sensors is studied in samples exposed to fluences relevant to the environment of the High Luminosity Large Hadron Collider. We measure the leakage current for a range of bias voltages on samples irradiated with 800 MeV protons up to 1.6\times 10^{16} p/cm^2. The proton beam at LANSCE, Los Alamos National Laboratory, was applied to irradiate the samples. The devices' resistivity is extracted for temperatures in the -10^\circC to +20^\circC range.
description: 13 pages, 8 figures
Cheilosia nigricornis Rondani 1844
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Cheilosia
Cheilosia nigricornis

description: [Cheilosia nigricornis] Rondani, 1844b: 198.
REMARKS: preoccupied by Macquart 1829; name that Rondani (1844b: 198) proposed as a synonym of Ferdinandea aurea Rondani, 1844 and was not made available by use as a valid species before 1961. Verrall (1901: 108), Bezzi & Stein (1907: 138), Kertész (1910: 322), Sack (1932: 419) and Peck (1988: 122) considered Cheilosia nigricornis as a “ nomen nudum published in synonymy with Ferdinandea cuprea ”. O’Hara et al. (2011: 211) incorrectly considered the name as available.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 276, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Studies on some singular potentials in quantum mechanics
Creators: name: Roy, Amlan K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A simple methodology is suggested for the efficient calculation of certain central potentials having singularities. The generalized pseudospectral method used in this work facilitates {\em nonuniform} and optimal spatial discretization. Applications have been made to calculate the energies, densities and expectation values for two singular potentials of physical interest, {\em viz.,} (i) the harmonic potential plus inverse quartic and sextic perturbation and (ii) the Coulomb potential with a linear and quadratic term for a broad range of parameters. The first 10 states belonging to a maximum of $\ell=8$ and 5 for (i) and (ii) have been computed with good accuracy and compared with the most accurate available literature data. The calculated results are in excellent agreement, especially in the light of the difficulties encountered in these potentials. Some new states are reported here for the first time. This offers a general and efficient scheme for calculating these and other similar potentials of physical and mathematical interest in quantum mechanics accurately.
Cheilosia testacicornis Rondani 1857
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Cheilosia
Cheilosia testacicornis

description: [Cheilosia testacicornis] Rondani, 1844b: 199.
REMARKS: name that Rondani (1844b: 201) proposed as a synonym of Ferdinandea cuprea (Scopoli, 1773) and not made available by use as a valid species before 1961. Verrall (1901: 107), Bezzi & Stein (1907: 139), Kertész (1910: 323), Sack (1932: 419) and Peck (1988: 122) considered Cheilosia testacicornis as a “ nomen nudum published in synonymy with Ferdinandea cuprea ”. O’Hara et al. (2011: 215) incorrectly considered the name as available.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 277, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Connection and Curvature on Bundles of Bergman and Hardy Spaces
Creators: name: Englis, Miroslav
name: Zhang, Genkai
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2020

description: We consider a complex domain $ D\times V$ in the space $\mathbb C^m\times \mathbb C^n$ and a family of weighted Bergman spaces on $V$ defined by a weight $e^{-k\phi(z, w)}$ for a pluri-subharmonic function $\phi(z, w)$ with a quantization parameter $k$. The weighted Bergman spaces define an infinite dimensional Hermitian vector bundle over the domain $D$. We consider the natural covariant differentiation $\nabla_Z$ on the sections, namely the unitary Chern connections preserving the Bergman norm. We prove a Dixmier trace formula for the curvature of the unitary connection and we find the asymptotic expansion for the curvatures $R^{(k)}(Z, Z)$ for large $k$ and for the induced connection $[\nabla_Z^{(k)}, T_f^{(k)}]$ on Toeplitz operators~$T_f$. In the special case when the domain $D$ is the Siegel domain and the weighted Bergman spaces are the Fock spaces we find the exact formula for $[\nabla_Z^{(k)}, T_f^{(k)}]$ as Toeplitz operators. This generalizes earlier work of J.E. Andersen in Comm. Math. Phys. 255 (2005), 727-745. Finally, we also determine the formulas for the curvature and for the induced connection in the general case of $D\times V$ replaced by a general strictly pseudoconvex domain $\mathcal V\subset\mathbb C^m\times\mathbb C^n$ fibered over a domain $D\subset\mathbb C^m$. The case when the Bergman space is replaced by the Hardy space on the boundary of the domain is likewise discussed.
description: DOCUMENTA MATHEMATICA, Vol 25 (2020), p. 189-217
Cheilosia testacicornis Rondani 1857
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Cheilosia
Cheilosia testacicornis

description: [Cheilosia testacicornis] Rondani, 1857: 150 (key), 154 (description).
REMARKS: misidentification. Rondani (1857: 154) used Cheilosia testacicornis (name unavailable) for a new Cheilosia species, described from just the female sex, without specifying either the number or the length of the specimens: “ Raro foeminam invenit Mussino in Liguria [Mussino rarely found the female in Liguria (Italy)]”. Cheilosia testacicornis has been considered as a valid species by Bezzi & Stein (1907: 26), Peck (1988: 188) and Belcari et al. (1995a: 13) and as a junior synonym of Cheilosia aerea Dufour, 1848 by Claussen & Thompson (1996: 276). Cheilosia testacicornis is here considered a misidentification and is therefore an unavailable name. Claussen & Thompson (1996: 276) reported no specimen under the name Cheilosia testacicornis in the MZUF. We could not locate any specimens with this name during this study. The subsequent spelling “ testaceicornis ” has been used (Peck 1988: 118, Belcari et al. 1995a: 13, O’Hara et al. 2011: 215) but it is not in prevailing usage (Bezzi & Stein 1907: 26, Claussen & Thompson 1996: 276).
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 277, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Dipolar Poisson-Boltzmann Approach to Ionic Solutions: A Mean Field and Loop Expansion Analysis
Creators: name: Levy, Amir
name: Andelman, David
name: Orland, Henri
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We study the variation of the dielectric response of ionic aqueous solutions as function of their ionic strength. The effect of salt on the dielectric constant appears through the coupling between ions and dipolar water molecules. On a mean-field level, we account for any internal charge distribution of particles. The dipolar degrees of freedom are added to the ionic ones and result in a generalization of the Poisson-Boltzmann (PB) equation called the Dipolar PB (DPB). By looking at the DPB equation around a fixed point-like ion, a closed-form formula for the dielectric constant is obtained. We express the dielectric constant using the "hydration length" that characterizes the hydration shell of dipoles around ions, and thus the strength of the dielectric decrement. The DPB equation is then examined for three additional cases: mixture of solvents, polarizable medium and ions of finite size. Employing field-theoretical methods we expand the Gibbs free-energy to first order in a loop expansion and calculate self-consistently the dielectric constant. For pure water, the dipolar fluctuations represent an important correction to the mean-field value and good agreement with the water dielectric constant is obtained. For ionic solutions we predict analytically the dielectric decrement that depends on the ionic strength in a non-linear way. Our prediction fits rather well a large range of concentrations for different salts using only one fit parameter related to the size of ions and dipoles. A linear dependence of the dielectric constant on the salt concentration is observed at low salinity, and a noticeable deviation from linearity can be seen for ionic strength above 1\,M, in agreement with experiments.
description: 16 pages, 8 figures
QuantumDynamics.jl: A modular approach to simulations of dynamics of open quantum systems
Creators: name: Bose, Amartya
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Simulation of non-adiabatic dynamics of a quantum system coupled to dissipative environments poses significant challenges. New sophisticated methods are regularly being developed with an eye towards moving to larger systems and more complicated description of solvents. Many of these methods, however, are quite difficult to implement and debug. Furthermore, trying to make the individual algorithms work together through a modular application programming interface (API) can be quite difficult. We present a new, open-source software framework, QuantumDynamics.jl, designed to address these challenges. It provides implementations of a variety of perturbative and non-perturbative methods for simulating the dynamics of these sytems. Most prominently, QuantumDynamics.jl supports hierarchical equations of motion and the family of methods based on path integrals. Effort has been made to ensure maximum compatibility of interface between the various methods. Additionally, QuantumDynamics.jl, being built on a high-level programming language, brings a host of modern features to explorations of systems such as usage of Jupyter notebooks and high level plotting for exploration of systems, possibility of leveraging high-performance machine learning libraries for further development. Thus, while the built-in methods can be used as end-points in themselves, the package provides an integrated platform for experimentation, exploration, and method development.
description: 17 pages, 9 figures
Conformational and state-specific effects in reactions of 2,3-dibromobutadiene with Coulomb-crystallized calcium ions
Creators: name: Kilaj, Ardita
name: Käser, Silvan
name: Wang, Jia
name: Straňák, Patrik
name: Schwilk, Max
name: Xu, Lei
name: von Lilienfeld, O. Anatole
name: Küpper, Jochen
name: Meuwly, Markus
name: Willitsch, Stefan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Recent advances in experimental methodology enabled studies of the quantum-state and conformational dependence of chemical reactions under precisely controlled conditions in the gas phase. Here, we generated samples of selected gauche and s-trans 2,3-dibromobutadiene (DBB) by electrostatic deflection in a molecular beam and studied their reaction with Coulomb crystals of laser-cooled $\mathrm{Ca^{+}}$ ions in an ion trap. The rate coefficients for the total reaction were found to strongly depend on both the conformation of DBB and the electronic state of $\mathrm{Ca^{+}}$. In the $\mathrm{(4p)~^{2}P_{1/2}}$ and $\mathrm{(3d)~^{2}D_{3/2}}$ excited states of $\mathrm{Ca^{+}}$, the reaction is capture-limited and faster for the gauche conformer due to long-range ion-dipole interactions. In the $\mathrm{(4s)~^{2}S_{1/2}}$ ground state of $\mathrm{Ca^{+}}$, the reaction rate for s-trans DBB still conforms with the capture limit, while that for gauche DBB is strongly suppressed. The experimental observations were analysed with the help of adiabatic capture theory, ab-initio calculations and reactive molecular dynamics simulations on a machine-learned full-dimensional potential energy surface of the system. The theory yields near-quantitative agreement for s-trans-DBB, but overestimates the reactivity of the gauche-conformer compared to the experiment. The present study points to the important role of molecular geometry even in strongly reactive exothermic systems and illustrates striking differences in the reactivity of individual conformers in gas-phase ion-molecule reactions.
A proposal for sympathetically cooling neutral molecules using cold ions
Creators: name: Robicheaux, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We describe a method for cooling neutral molecules that have magnetic and electric dipole moments using collisions with cold ions. An external magnetic field is used to split the ground rovibrational energy levels of the molecule. The highest energy state within the ground rovibrational manifold increases in energy as the distance to the ion decreases leading to a repelling potential. At low energy, inelastic collisions are strongly suppressed due to the large distance of closest approach. Thus, a collision between a neutral molecule and a cold ion will lead to a decrease in the molecule's kinetic energy with no change in internal energy. We present results for the specific case of OH molecules cooled by Be$^+$, Mg$^+$, or Ca$^+$ ions.
Modeling of Laser wakefield acceleration in Lorentz boosted frame using EM-PIC code with spectral solver
Creators: name: Yu, Peicheng
name: Xu, Xinlu
name: Decyk, Viktor K.
name: An, Weiming
name: Vieira, Jorge
name: Tsung, Frank S.
name: Fonseca, Ricardo A.
name: Lu, Wei
name: Silva, Luis O.
name: Mori, Warren B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Simulating laser wakefield acceleration (LWFA) in a Lorentz boosted frame in which the plasma drifts towards the laser with $v_b$ can speedup the simulation by factors of $γ^2_b=(1-v^2_b/c^2)^{-1}$. In these simulations the relativistic drifting plasma inevitably induces a high frequency numerical instability that contaminates the interested physics. Various approaches have been proposed to mitigate this instability. One approach is to solve Maxwell equations in Fourier space (a spectral solver) as this has been shown to suppress the fastest growing modes of this instability in simple test problems using a simple low pass, ring (in two dimensions), or shell (in three dimensions) filter in Fourier space. We describe the development of a fully parallelized, multi-dimensional, particle-in-cell code that uses a spectral solver to solve Maxwell's equations and that includes the ability to launch a laser using a moving antenna. This new EM-PIC code is called UPIC-EMMA and it is based on the components of the UCLA PIC framework (UPIC). We show that by using UPIC-EMMA, LWFA simulations in the boosted frames with arbitrary $γ_b$ can be conducted without the presence of the numerical instability. We also compare the results of a few LWFA cases for several values of $γ_b$, including lab frame simulations using OSIRIS, a EM-PIC code with a finite difference time domain (FDTD) Maxwell solver. These comparisons include cases in both linear, and nonlinear regimes. We also investigate some issues associated with numerical dispersion in lab and boosted frame simulations and between FDTD and spectral solvers.
Morphological and distributional patterns of native and invasive Trifolium (Papilionoideae, Leguminosae) species in southern South America
Creators: name: De Diego, Fernando Carlos
name: Robbiati, Federico Omar
name: Gaitán, Juan José
name: Fortunato, Renée Hersilia
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Plant Biology

description: The ability of a species to colonize new geographical areas is closely related to its morphological response to environmental gradients. Previous studies compared native and alien invasive species in their ability to modify their morphology in reaction to climatic and edaphic factors; however, taxonomically close species have been scarcely analyzed. In this study, morphological variability patterns associated with abiotic factors were evaluated in Trifolium polymorphum, a native species distributed from southern Brazil to northern Patagonia, and Trifolium repens, a species introduced as an important forage crop and naturalized in diverse environments of southern South America. A morphometric study was carried out using herbarium specimens that were then georeferenced to obtain environmental and distributional data. Morphological traits along abiotic and geographical gradients were analyzed, predictive distribution and current and future niches were modelled. Our results showed that leaf morphology of T. repens responds to precipitation and temperature factors, which could explain its invasive behavior in a wide range of environments. Morphological variability of the native T. polymorphum presented a low association with abiotic factors, suggesting possible difficulties in adapting to future environmental changes. Ecological niche modelling analysis showed several overlap areas between species in the current model and a greater expansion of the distribution range of the invasive species in future climate change scenarios.
A conceptual replication of Brooke’s 1991 chapter: Do Jewish responses to Copernican thought corroborate the findings?
Creators: name: Pear, Rachel
name: Van Eyghen, Hans
name: Peels, Rik
name: Bouter, Lex
name: van den Brink, Gijsbert
name: van Woudenberg, René
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: History
subject: Religion
subject: Arts and Humanities
subject: Jewish Studies
subject: science and religion

description: This postdoctoral research is part of a subproject entitled "Progress in the humanities-- replication of cornerstone studies," which in turn sits within the larger project "Epistemic Progress in the University" being carried out at the Abraham Kuyper Center, Vrije Universiteit Amsterdam.
A narrow structure in the excitation function of eta-photoproduction off the neutron
Creators: name: Werthmueller, D.
name: Witthauer, L.
name: Keshelashvili, I.
name: Aguar-Bartolome, P.
name: Ahrens, J.
name: Annand, J. R. M.
name: Arends, H. J.
name: Bantawa, K.
name: Beck, R.
name: Bekrenev, V.
name: Braghieri, A.
name: Branford, D.
name: Briscoe, W. J.
name: Brudvik, J.
name: Cherepnya, S.
name: Demissie, B.
name: Dieterle, M.
name: Downie, E. J.
name: Drexler, P.
name: Fil'kov, L. V.
name: Fix, A.
name: Glazier, D. I.
name: Hamilton, D.
name: Heid, E.
name: Hornidge, D.
name: Howdle, D.
name: Huber, G. M.
name: Jaegle, I.
name: Jahn, O.
name: Jude, T. C.
name: Kaeser, A.
name: Kashevarov, V. L.
name: Kondratiev, R.
name: Korolija, M.
name: Kruglov, S. P.
name: Krusche, B.
name: Kulbardis, A.
name: Lisin, V.
name: Livingston, K.
name: MacGregor, I. J. D.
name: Maghrbi, Y.
name: Mancell, J.
name: Manley, D. M.
name: Marinides, Z.
name: Martinez, M.
name: McGeorge, J. C.
name: McNicoll, E. F.
name: Metag, V.
name: Middleton, D. G.
name: Mushkarenkov, A.
name: Nefkens, B. M. K.
name: Nikolaev, A.
name: Novotny, R.
name: Oberle, M.
name: Ostrick, M.
name: Oussena, B.
name: Pedroni, P.
name: Pheron, F.
name: Polonski, A.
name: Prakhov, S. N.
name: Robinson, J.
name: Rosner, G.
name: Rostomyan, T.
name: Schumann, S.
name: Sikora, M. H.
name: Sober, D.
name: Starostin, A.
name: Supek, I.
name: Thiel, M.
name: Thomas, A.
name: Unverzagt, M.
name: Watts, D. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The photoproduction of $η$-mesons off nucleons bound in $^2$H and $^3$He has been measured in coincidence with recoil protons and recoil neutrons for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI accelerator, using the Glasgow tagged photon facility. Decay photons from the $η\rightarrow 2γ$ and $η\rightarrow 3π^0$ decays and the recoil nucleons were detected with an almost $4π$ electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The data from both targets are of excellent statistical quality and show a narrow structure in the excitation function of $γn\rightarrow nη$. The results from the two measurements are consistent taking into account the expected effects from nuclear Fermi motion. The best estimates for position and intrinsic width of the structure are $W$ = (1670$\pm$5) MeV and $Γ$ =(30$\pm$15) MeV. For the first time precise results for the angular dependence of this structure have been extracted.
description: Accepted for publication in Phys. Rev. Lett
Quantum Affine Wreath Algebras
Creators: name: Rosso, Daniele
name: Savage, Alistair
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2020

description: To each symmetric algebra we associate a family of algebras that we call quantum affine wreath algebras. These can be viewed both as symmetric algebra deformations of affine Hecke algebras of type $A$ and as quantum deformations of affine wreath algebras. We study the structure theory of these new algebras and their natural cyclotomic quotients.
description: DOCUMENTA MATHEMATICA, Vol 25 (2020), p. 425-456
Spazigaster alpinus Rondani 1857
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Spazigaster
Spazigaster alpinus

description: [Spazigaster alpinus] Rondani, 1857: 108.
REMARKS: name that Rondani (1857: 108) proposed as a synonym of Spazigaster lugubris (Costa, 1857) and was not made available by use as a valid species before 1961. O’Hara et al. (2011: 206) considered the name as unavailable.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 277, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Quasiparticle and Optical Properties of Carrier-Doped Monolayer MoTe$_2$ from First Principles
Creators: name: Champagne, Aurelie
name: Haber, Jonah B.
name: Pokawanvit, Supavit
name: Qiu, Diana Y.
name: Biswas, Souvik
name: Atwater, Harry A.
name: da Jornada, Felipe H.
name: Neaton, Jeffrey B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The intrinsic weak and highly non-local dielectric screening of two-dimensional materials is well known to lead to high sensitivity of their optoelectronic properties to environment. Less studied theoretically is the role of free carriers on those properties. Here, we use ab initio GW and Bethe-Salpeter equation calculations, with a rigorous treatment of dynamical screening and local-field effects, to study the doping-dependence of the quasiparticle and optical properties of a monolayer transition metal dichalcogenide, 2H MoTe$_2$. We predict a quasiparticle band gap renormalization of several hundreds meV for experimentally-achievable carrier densities, and a similarly sizable decrease in the exciton binding energy. This results in an almost constant excitation energy for the lowest-energy exciton resonance with increasing doping density. Using a newly-developed and generally-applicable quasi-2D plasmon-pole model and a self-consistent solution of the Bethe-Salpeter equation, we reveal the importance of accurately capturing both dynamical and local-field effects to understand detailed photoluminescence measurements.
description: 22 pages, 5 figures, under review in Nano Letters
Saturated-absorption spectroscopy revisited: atomic transitions in strong magnetic fields ($>$20 mT) with a micrometer-thin cell
Creators: name: Sargsyan, A.
name: Tonoyan, A.
name: Mirzoyan, R.
name: Sarkisyan, D.
name: Stabrawa, A. M. Wojciechowski A.
name: Gawlik, W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The existence of cross-over resonances makes saturated-absorption spectra very complicated when external magnetic field B is applied. It is demonstrated for the first time that the use of micrometric-thin cells (MTC, $L\approx40\,μ$m) allows application of SA for quantitative studies of frequency splittings and shifts of the Rb atomic transitions in a wide range of external magnetic fields, from 0.2 up to 6 kG (20-600 mT). We compare the SA spectra obtained with the MTC with those obtained with other techniques, and present applications for optical magnetometry with micrometer spatial resolution and a broadly tunable optical frequency reference.
description: 4 pages, 6 figures
Meaning in life and positive impact - Testing a fourth factor to the measure of Meaning In Life (version with more attention checks).
Creators: name: Fuhrer, Joffrey
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: In this study, our goal is to test the hypothesis that adding a fourth factor (Impact) to current measures of Meaning In Life will improve our assessment of Meaning In Life. More precisely, we hypothesize that (i) Impact will significantly predict Meaning in Life even when controlling for the three traditional factors, that (ii) adding Impact to the predictors of meaning in life will significantly improve prediction of Meaning in Life, that (iii) a four-factor structure will be a better fit of the data than a 1-factor, 2-factor, and 3-factor structure, and (iv), there will be a positive correlation between the facet Impact and the intrinsic aspiration Community contributions. This study is similar to the one preregistered to the one preregistered under the name "Meaning in life and positive impact - Testing a fourth factor to the measure of Meaning In Life". However, due to the very high correlations between the different facets of Meaning in Life we observed in this study, we feared the presence of a response bias, and increased the number of attention checks (including more discrete attention checks) in the present study.
Pipiza quatuorguttata Rondani 1857
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Pipiza
Pipiza quatuorguttata

description: [Pipiza quatuorguttata] Rondani, 1857: 183
REMARKS: nomen nudum that Rondani (1857: 183) incorrectly attributed to Macquart.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 278, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Commentario Delle Opere E Delle Vicende Di Giorgio Biandrata Nobile Saluzzese Archiatro In Transilvania E In Polonia; 1814
Creators: name: Malacarne, Vincenzo
name: Biandrata, Giorgio
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2011

description: Verf. nicht auf der Haupttitelseite genannt. - Ermittelt aus der Widmung und dem Schutzumschlag. - Nebentitel: Commentario Di Giorgio Biandrata. - Weiterer Nebentitel: Commentario Del Biandrata. Orazione inaugurale Padova 1814
Spectral Sum Rules and Magneto-Roton as Emergent Graviton in Fractional Quantum Hall Effect
Creators: name: Golkar, Siavash
name: Nguyen, Dung X.
name: Son, Dam T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider gapped fractional quantum Hall states on the lowest Landau level when the Coulomb energy is much smaller than the cyclotron energy. We introduce two spectral densities, ρ_T(ω) and \bar ρ_T(ω), which are proportional to the probabilities of absorption of circularly polarized gravitons by the quantum Hall system. We prove three sum rules relating these spectral densities with the shift S, the q^4 coefficient of the static structure factor S_4, and the high-frequency shear modulus of the ground state μ_\infty, which is precisely defined. We confirm an inequality, first suggested by Haldane, that S_4 is bounded from below by |S-1|/8. The Laughlin wavefunction saturates this bound, which we argue to imply that systems with ground state wavefunctions close to Laughlin's absorb gravitons of predominantly one circular polarization. We consider a nonlinear model where the sum rules are saturated by a single magneto-roton mode. In this model, the magneto-roton arises from the mixing between oscillations of an internal metric and the hydrodynamic motion. Implications for experiments are briefly discussed.
description: 17 pages, 2 figures
New constraints on the presence of debris disks around G 196-3 B and VHS J125601.92-125723.9 b
Creators: name: Zakhozhay, O. V.
name: Osorio, M. R. Zapatero
name: Bejar, V. J. S.
name: Climent, J. B.
name: Guirado, J. C.
name: Gauza, B.
name: Lodieu, N.
name: Semenov, D. A.
name: Perez-Torres, M.
name: Azulay, R.
name: Rebolo, R.
name: Martin-Pintado, J.
name: Lefevre, Ch.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We obtained deep images of G 196-3 B and VHS J1256-1257 b with the NOrthern Extended Millimeter Array (NOEMA) at 1.3 mm. These data were combined with recently published Atacama Large Millimeter Array (ALMA) and Very Large Array (VLA) data of VHS J1256-1257 b at 0.87 mm and 0.9 cm, respectively. Neither G 196-3 B nor VHS J1256-1257 b were detected in the NOEMA, ALMA and VLA data. At 1.3 mm, we imposed flux upper limits of 0.108 mJy (G 196-3 B) and 0.153 mJy (VHS J1256-1257 b) with a 3-sigma confidence. Using the flux upper limits at the millimeter and radio wavelength regimes, we derived maximum values of 0.016 M$_{\rm Earth}$ and 0.004 M$_{\rm Earth}$ for the mass of any cold dust that might be surrounding G 196-3 B and VHS J1256-1257 b, respectively. We put our results in the context of other deep millimeter observations of free-floating and companion objects with substellar masses smaller than 20 M$_{\rm Jupiter}$ and ages between 1 and a few hundred million years. Only two very young objects are detected out of a few tens concluding, as other groups did before, that the disks around these very low-mass objects must have small masses and possibly reduced sizes. If debris disks around substellar objects scale down in a similar manner as protoplanetary disks do, millimeter observations of moderately young brown dwarfs and planets must be at least two orders of magnitude deeper for being able to detect and characterize their surrounding debris disks.
description: Accepted fro publication in A&A
Effective dynamics of twisted and curved scroll waves using virtual filaments
Creators: name: Dierckx, Hans
name: Verschelde, Henri
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Scroll waves are three-dimensional excitation patterns that rotate around a central filament curve; they occur in many physical, biological and chemical systems. We explicitly derive the equations of motion for scroll wave filaments in reaction-diffusion systems with isotropic diffusion up to third order in the filament's twist and curvature. The net drift components define at every instance of time a virtual filament which lies close to the instantaneous filament. Importantly, virtual filaments obey simpler, time-independent laws of motion which we analytically derive here and illustrate with numerical examples. Stability analysis of scroll waves is performed using virtual filaments, showing that filament curvature and twist add as quadratic terms to the nominal filament tension. Applications to oscillating chemical reactions and cardiac tissue are discussed.
description: 28 pages