cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Large Eddy Simulation of MILD combustion using PDF based turbulence-chemistry interaction models
Creators: name: Bhaya, Rohit
name: De, Ashoke
name: Yadav, Rakesh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present work reports on LES of turbulent reacting flow of the Delft-Jet-in-Hot-Coflow (DJHC) burner, emulating MILD combustion, with transported PDF based combustion models using ANSYS FLUENT 13.0. Two different eddy viscosity models for LES (Dynamic Smagorinsky and Kinetic Energy Transport) along with two solution approaches for PDF transport equation, i.e. Eulerian and Lagrangian, have been used in the present study. Moreover, the effects of chemical kinetics and the micro-mixing models have also been investigated for two different fuel jet Reynolds number (Re = 4,100 and Re = 8,800). The mean velocity and turbulent kinetic energy predicted by the different models are in good agreement with experimental data. Both the composition PDF models predict an early ignition resulting in higher radial mean temperature predictions at burner exit. The models, however, correctly predict the formation mechanism of ignition kernels and the decreasing trend of the lift-off height with increasing jet Reynolds number, as observed experimentally.
Electron-Phonon Mass Enhancement in Multi-Layers
Creators: name: Bergmann, Gerd
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A strong electron-phonon interaction in a metal increases the electron density of states in the vicinity of the Fermi energy dramatically. This phenomenon is called electron-phonon mass enhancement. In this paper the question is investigated whether the mass enhancement can be manipulated in multi-layers of two metals with strong and weak electron-phonon interaction. A rich behavior is observed for different thickness ranges of the layers. For thin layers one observes a rather homogeneous averaged enhancement. However, for an intermediate thickness range the mass enhancement is highly anisotropic, i.e. direction dependent, as well as position dependent. For large layer thicknesses one obtains the bulk behavior for each metal.
Search for Off-pulse emission in Long Period Pulsars
Creators: name: Basu, Rahul
name: Mitra, Dipanjan
name: Melikidze, George I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We have revisited the problem of off-pulse emission in pulsars, where detailed search for the presence of low level radio emission outside the pulse window is carried out. The presence of off-pulse emission was earlier reported in two long period pulsars, PSR B0525+21 and B2046-16 at frequencies below 1 GHz using the Giant Meterwave Radio Telescope (GMRT). However, subsequent studies did not detect off-pulse emission from these pulsars at higher radio frequencies (> 1 GHz). We have carefully inspected the analysis scheme used in the earlier detections and found an anomaly with data editing routines used, which resulted in leakage of signal from the on-pulse to the off-pulse region. We show that the earlier detections from PSR B0525+21 and B2046-16 were a result of this leakage. The above analysis scheme has been modified and offline-gating has been used to search for off-pulse emission in 21 long period pulsars (P > 1.2 sec) at different observing frequencies of GMRT. The presence of low level off-pulse emission of peak flux 0.5 mJy was detected in the brightest pulsar in this list PSR 0B0628-28, with off-pulse to average pulsar flux ratio of 0.25%. We suggest that coherent radio emission resulting due to cyclotron resonance near the light cylinder can be a possible source for the off-pulse emission in this pulsar.
description: 12 pages, 5 figures, to be published in ApJ
Recensione a DARIO VITALI, «Un popolo in cammino verso Dio». La sinodalità in Evangelii gaudium (= Evangelii gaudium. Via per il cammino della Chiesa in Italia 2), San Paolo, Cinisello Balsamo 2018
Creators: name: Galati, Antonio
Publisher: name: Istituto Teologico Leoniano di Anagni
Year: 2019

description: Recensione a DARIO VITALI, «Un popolo in cammino verso Dio». La sinodalità in Evangelii gaudium (= Evangelii gaudium. Via per il cammino della Chiesa in Italia 2), San Paolo, Cinisello Balsamo 2018
title: Славистическая наука в эпохи перемен: время взлетов и время падений
title: Slavistic science in the era of change: a time of ups and a time of downs
Creators: name: Бондарь, Л. Д.
Publisher: name: Реноме
Year: 2021

description: В статье отмечены особенности истории славистической науки во второй половине XIX — первой трети ХХ в., сформировавшейся интенсивными исследованиями и плодотворным международным сотрудничеством. Первая Мировая война разрушила научные связи, парализовав научную деятельность и продемонстрировав тем самым важность фактора международного обмена. Славистике удалось пережить свой ренессанс в межвоенное время, обусловленный национальным энтузиазмом славянских народов, обретших свою государственность, однако репрессии тоталитарных государств (советского и гитлеровского), затронувшие европейских ученых, нанесли значимый урон европейской науке и существенным образом сократили масштабы славистических исследований.

description: The article highlights the features of the history of slavistic science in the second half of the 19 th — first third of the 20 th century, which was formed in the Imperial powers as a response to socio-political movements in Europe in the middle of the 19 th century. Despite the fact that the lands with Slavic populations were included in all three considered empires (Russian, Austro-Hungarian and German), there were differences in the ethnicity of the titular nation — Slavic for Russia and non-Slavic for other powers, which to a certain extent determined the scientific and organizational models of Slavic studies: the Russian Empire was characterized by a certain centralization in the face of the Second Department of the Imperial Academy of Sciences, while the Slavic schools of European powers were formed primarily in universities, including those located on Slavic lands. The period under review is characterized by both extensive and intensive research and fruitful international cooperation. The I World war destroyed scientific ties, paralyzing scientific activity and thus demonstrating the importance of international exchange. Slavistics managed to survive its Renaissance in the interwar period, due to the national enthusiasm of the Slavic peoples who gained their statehood. Czech scientific circles, including representatives of the Russian scientific emigration, played a significant role in the activation of slavistic research during this period. However, the repressions of totalitarian states (on the one hand, repressions of the state authorities of the USSR against representatives of the old Russian scientific school, on the other — repressions of the Hitlerite regime against the Slavic intellectuals in the occupied territories) caused significant damage to European science and significantly reduced the scale of slavistic research.
Large Eddy Simulation of a Premixed Bunsen flame using a modified Thickened-Flame model at two Reynolds number
Creators: name: De, Ashoke
name: Acharya, Sumanta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A modified Thickened Flame (TF) model based on Large Eddy Simulation methodology is used to investigate premixed combustion and the model predictions are evaluated by comparing with the piloted premixed stoichiometric methane-air flame data (Chen et al., 1996) for Reynolds numbers Re = 24,000 (flame F3) and Re=52,000 (flame F1). The basic idea of Thickened-Flame approach is that the flame front is artificially thickened to resolve on the computational LES grid while keeping the laminar flame speed ( ) constant. The artificially thickening of the flame front is obtained by enhancing the molecular diffusion and decreasing the pre-exponential factor of the Arrhenius law. Since the flame front is artificially thickened, the response of the thickened flame to turbulence is affected and taken care of by incorporating an efficiency function (E) in the governing equations. The efficiency function (E) in the modified TF model is proposed based on the direct numerical simulations (DNS) data set of flame-vortex interactions (Colin et al., 2000). The predicted simulation results are compared with the experimental data and with computations reported using RANS based probability distribution function (PDF) modeling approach (Lindstedt, R. P. and Vaos, E. M., 2006, Transported PDF modeling of high-Reynolds-number premixed turbulent flames, Combustion and Flame, 145, 495) and RANS based G-equation approach (Herrmann, M., 2006). It is shown that the results with the modified TF model are generally in good agreement with the data, with the TF predictions consistently comparable to the PDF model predictions and superior to the results with the G-equation approach.
Wronskian Formulation of the Spectrum of Curvature Perturbations
Creators: name: Yokoyama, Shuichiro
name: Tanaka, Takahiro
name: Sasaki, Misao
name: Stewart, Ewan D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new formulation for the evaluation of the primordial spectrum of curvature perturbations generated during inflation, using the fact that the Wronskian of the scalar field perturbation equation is constant. In the literature, there are many works on the same issue focusing on a few specific aspects or effects. Here we deal with the general multi-component scalar field, and show that our new formalism gives a method to evaluate the final amplitude of the curvature perturbation systematically and economically. The advantage of the new method is that one only has to solve a single mode of the scalar field perturbation equation backward in time from the end of inflation to the stage at which the perturbation is within the Hubble horizon, at which the initial values of the scalar field perturbations are given. We also clarify the relation of the new method with the new delta N formalism recently developed in Lee et al.(2005).
description: 13 pages, 1 figures, submitted to JCAP, Minor corrections have been made
Final fate of spherically symmetric gravitational collapse of a dust cloud in Einstein-Gauss-Bonnet gravity
Creators: name: Maeda, Hideki
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We give a model of the higher-dimensional spherically symmetric gravitational collapse of a dust cloud in Einstein-Gauss-Bonnet gravity. A simple formulation of the basic equations is given for the spacetime $M \approx M^2 \times K^{n-2}$ with a perfect fluid and a cosmological constant. This is a generalization of the Misner-Sharp formalism of the four-dimensional spherically symmetric spacetime with a perfect fluid in general relativity. The whole picture and the final fate of the gravitational collapse of a dust cloud differ greatly between the cases with $n=5$ and $n \ge 6$. There are two families of solutions, which we call plus-branch and the minus-branch solutions. Bounce inevitably occurs in the plus-branch solution for $n \ge 6$, and consequently singularities cannot be formed. Since there is no trapped surface in the plus-branch solution, the singularity formed in the case of $n=5$ must be naked. In the minus-branch solution, naked singularities are massless for $n \ge 6$, while massive naked singularities are possible for $n=5$. In the homogeneous collapse represented by the flat Friedmann-Robertson-Walker solution, the singularity formed is spacelike for $n \ge 6$, while it is ingoing-null for $n=5$. In the inhomogeneous collapse with smooth initial data, the strong cosmic censorship hypothesis holds for $n \ge 10$ and for $n=9$ depending on the parameters in the initial data, while a naked singularity is always formed for $5 \le n \le 8$. These naked singularities can be globally naked when the initial surface radius of the dust cloud is fine-tuned, and then the weak cosmic censorship hypothesis is violated.
description: 23 pages, 1 figure, final version to appear in Physical Review D
Baseline Modeling of the Owensboro Cable-Stayed Bridge Over the Ohio River
Creators: name: Hu, Jindong
name: Harik, Issam E.
name: Smith, Suzanne Weaver
name: Gagel, Jeff
name: Campbell, Jennie E.
name: Graves, R. Clark
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 2006
Subjects: subject: Transportation Engineering

description: This report presents the baseline modeling of the Owensboro cable-stayed bridge which connects Owensboro, Kentucky and Rockport, Indiana over the Ohio River. The objective of this study is to establish the bridge baseline model via the dynamics-based technique and finite element method. The scope of research includes finite element modeling and modal analysis, field free vibration testing, finite element model calibration using field test results, and cable dynamic testing and modeling. It is demonstrated that a cable-stayed bridge is a highly pre-stressed structure. The stress stiffening of cable elements plays an important role in both static and dynamic analysis. The large deflection analysis has shown that large deflection has the limited effect on the member deflections. Dominate dynamic response modes in the low frequency range contain vertical and transverse directions. The free vibration modes of the bridge are complicated and coupled. A good agreement of frequencies has been found between finite element modeling and in field free vibration testing after calibrating the finite element model. But, the better matching for higher modes is not expected and not realistic, as the experimental model properties of the bridge come from the output-only measurement. The calibrated finite element model may be used as a baseline in the future structural analysis and monitoring of the Owensboro cable-stayed bridge.
Recensione a GIACINTO MANCINI, Sinodalità. Esercizi per la parrocchia, Effatà, Cantalupa 2020
Creators: name: Galati, Antonio
Publisher: name: Istituto Teologico Leoniano di Anagni
Year: 2021

description: Recensione a GIACINTO MANCINI, Sinodalità. Esercizi per la parrocchia, Effatà, Cantalupa 2020
Cooper Drive Pedestrian Study
Creators: name: Kirk, Adam
name: Stamatiadis, Nikiforos
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 2006
Subjects: subject: Transportation Engineering

description: The purpose of this report is to summarize the findings of the pedestrian study conducted for Cooper Drive from Nicholasville Road to Sports Center Drive on the University of Kentucky Campus in Lexington, KY. This study was initiated by the University of Kentucky Parking and Transportation Services in response to high pedestrian crossing volumes on Cooper Drive. Cooper Drive is crossed daily by a large number of pedestrians to access the main campus from the stadium parking lot and Bluegrass Community and Technical College (BCTC). This study examines several roadway alternatives that have potential to improve these pedestrian movements in a safe and efficient manner.
Quantification of the Benefits of Access Management for Kentucky
Creators: name: Kirk, Adam
name: Pigman, Jerry G.
name: House, Barry
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 2006

description: This report describes the benefits quantification performed for the proposed access management plan for Kentucky. This study evaluates the capacity, safety and economic impacts associated with access management programs. The proposed Kentucky access management program will seek to standardize driveway and traffic signal spacing on all state maintained roadways in the state. The TRB Access Impact Calculator developed as a part of by NCHRP Report 420, was used to evaluate the potential benefits of the proposed plan on a sample of Kentucky roadways. The results of this analysis were then extrapolated to the statewide system to estimate total annual savings in delay and crash reductions. Based upon this analysis, it is estimated that proposed access management plan could save Kentucky road users approximately 950 million dollars per year.
Widmann, Alexander Christian: Wandel mit Gewalt? Der deutsche Protestantismus und die politische motivierte Gewaltanwendung in den 1960er und 1970er Jahren
Creators: name: Sarx, Tobias
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 63 Nr. 1 (2014): Ökumenische Rundschau, Band 63, Heft 1
Cultivating credibility: a study of how news anchors establish trust
Creators: name: Eisler, Karyn Lee
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines television news anchor credibility - cultivation . The establishment of trust is examined through its relationship to station identity and audience construction. Open-focused interviews with news anchors, news directors, producers and make-up artists in a major Canadian television market were conducted. I maintain that anchors' actions and looks can personify distinction and credibility when they reflect viewers' tastes and sensibilities . Perceptions of anchor trustworthiness are the key t o viewer loyalty decisions and station identity . I contend that credibility cultivation requires anchors' entry into a complex system of expressive control which is exercised through constraint and expectation. Institutional needs for trust and an audience, the constraints imposed by the medium, entertainment format and news genre, all contribute to the expressive standards which must be adhered to. The image demands are intensified when viewer reflexivity , continuity and trust needs are incorporated into an already rigid performance regimen. There is room, however, for anchors' authentic expressions which are integral to the construction of trust and necessary reflections of both station and viewer uniqueness. Findings suggest that anchors who cultivate the appearance of their own accessibility are likely to be trusted because they seem familiar , on some level , to typical citizens tuning in . I argue that while this image is currently in vogue, it is unlikely to be a permanent mode of trustworthy expression. Dominant styles and viewer loyalty patterns appear to undergo evolutionary transformations. Distrust of the friendly facade could arise from any number of unforseen cultural changes and through changing expectations that are prompted by anchors who continually negotiate the trustworthiness of their image with the audience.
Electron Emission in Superfluid and Low-temperature Vapor Phase Helium
Creators: name: Silvera, Isaac F.
name: Tempere, Jacques
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Tungsten filaments used as sources of electrons in a low temperature liquid or gaseous helium environment have remarkable properties of operating at thousands of degrees Kelvin in surroundings at temperatures of order 1 K. We provide an explanation of this performance in terms of important changes in the thermal transport mechanisms. The behavior can be cast as a first-order phase transition.
description: 12 pages, 3 figures
Letter from J. Corbett at The Canadian Bank of Commerce to "Sir" at Rainbow Ranche, September 14, 1912
Creators: name: Canadian Bank Of Commerce
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to "Sir" at Rainbow Ranche from J. Corbett at The Canadian Bank of Commerce, dated September 14, 1912, regarding finances and the limited authorization the manager of the ranch has at the bank.
Ferrario, Fulvio und Jonas, Michael (Hrsg.): Umstrittene Ökumene
Creators: name: Klaiber, Walter
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 63 Nr. 1 (2014): Ökumenische Rundschau, Band 63, Heft 1
Mass sensing for the advanced fabrication of nanomechanical resonators
Creators: name: Gruber, G.
name: Urgell, C.
name: Tavernarakis, A.
name: Stavrinadis, A.
name: Tepsic, S.
name: Magen, C.
name: Sangiao, S.
name: de Teresa, J. M.
name: Verlot, P.
name: Bachtold, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on a nanomechanical engineering method to monitor matter growth in real time via e-beam electromechanical coupling. This method relies on the exceptional mass sensing capabilities of nanomechanical resonators. Focused electron beam induced deposition (FEBID) is employed to selectively grow platinum particles at the free end of singly clamped nanotube cantilevers. The electron beam has two functions: it allows both to grow material on the nanotube and to track in real time the deposited mass by probing the noise-driven mechanical resonance of the nanotube. On the one hand, this detection method is highly effective as it can resolve mass deposition with a resolution in the zeptogram range; on the other hand, this method is simple to use and readily available to a wide range of potential users, since it can be operated in existing commercial FEBID systems without making any modification. The presented method allows to engineer hybrid nanomechanical resonators with precisely tailored functionality. It also appears as a new tool for studying growth dynamics of ultra-thin nanostructures, opening new opportunities for investigating so far out-of-reach physics of FEBID and related methods.
description: Published in Nano Letters
The existence of a 2Po excited state for the e+Ca system
Creators: name: Bromley, M. W. J.
name: Mitroy, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The Configuration Interaction method is used to demonstrate that there is an electronically stable state of positronic calcium with an orbital angular momentum of L=1. This prediction relies on the use of an asymptotic series to estimate the variational limit of the energy. The best estimate of the binding energy is 37 meV. A discussion of the structure of the system is also presented.
description: 4 pages, 2 figures, in press PRL
The buildup of stellar mass and the 3.6 micron luminosity function in clusters from z=1.25 to z=0.2
Creators: name: Andreon, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have measured the 3.6 micron luminosity evolution of about 1000 galaxies in 32 clusters at 0.2
description: appeared on A&A (A&A 448, 447)
Use of a Local Local Oscillator for the Satellite-to-Earth Channel
Creators: name: Kish, Sebastian
name: Villaseñor, Eduardo
name: Malaney, Robert
name: Mudge, Kerry
name: Grant, Kenneth
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Continuous variable quantum key distribution (CV-QKD) offers information-theoretic secure key sharing between two parties. The sharing of a phase reference frame is an essential requirement for coherent detection in CV-QKD. Due to the potential attacks related to transmitting the local oscillator (LO) alongside quantum signals, there has been a focus on using local LOs (LLOs) to establish a shared phase reference. In this work, we develop a new noise model of a current state-of-the-art LLO scheme in the context of the satellite-to-Earth channel. In doing this, we encapsulate detailed phase-screen calculations that determine the coherent efficiency - a critical parameter in free-space CV-QKD that characterizes the wavefront aberrations caused by atmospheric turbulence. Using our new noise model we then determine the CV-QKD key rates for the satellite-to-Earth channel, secure under general attacks in the finite-size regime of the LLO scheme. Our results are of practical importance for next-generation quantum-enabled satellites that utilize multi-photon technology as opposed to single-photon technology.
Is the pioneer anomaly a counter example to the dark matter hypothesis?
Creators: name: Oliveira, Firmin J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Hubble law is extended to massive particles based on the de Broglie wavelength. Due to the expansion of the universe the wavelength of an unbound particle would increase according to its cosmological redshift. Based on the navigation anomalies of the Pioneer 10 & 11 spacecraft it is postulated that an unbound massive particle has a cosmological redshift z = (c / v_0) H_0 t, where c is the speed of light in vacuum, v_0 is the initial velocity of the particle, H_0 is Hubble's constant and t is the duration of time that the particle has been unbound. The increase in wavelength of the particle corresponds to a decrease in its speed by delta_v = - c H_0 t. Furthermore, it is hypothesized that the solar system has escaped the gravity of the Galaxy as evidenced by its orbital speed and radial distance and by the visible mass within the solar system radius. This means that spacecraft which become unbound to the solar system would also be galactically unbound and subject to the Hubble law. This hypothesis and the extended Hubble law may explain the anomalous acceleration found to be acting upon the unbound Pioneer 10 & 11 spacecraft. Thus, the Pioneer anomaly may be a counter example to the dark matter hypothesis. Because photons have a speed which make them unbound to the Galaxy, it is predicted that the navigation beam in open space would undergo a cosmological redshift in its frequency which would be detectable with modern clocks.
description: Ver. 1: 4 pages. Submitted for publication. Ver. 2: 7 pages. The extension of the Hubble law to massive particles is the same as in version 1, but the rest is a total re-write. Intended to be submitted for publication. Ver. 3: 8 pages. Ver. 4: 10 pages. Theoretical support added (JL Anderson) Ver. 5: 9 pages. Title changed. Accepted by Int. J. Theor. Phys
Multipole (E1, M1, E2, M2, E3, M3) transition wavelengths and rates between 3l5l' excited and ground states in nickel-like ions
Creators: name: Safronova, U. I.
name: Safronova, A. S.
name: Beiersdorfer, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A relativistic many-body method is developed to calculate energy and transition rates for multipole transitions in many-electron ions. This method is based on relativistic many-body perturbation theory (RMBPT), agrees with MCDF calculations in lowest-order, includes all second-order correlation corrections and includes corrections from negative energy states. Reduced matrix elements, oscillator strengths, and transition rates are calculated for electric-multipole (dipole (E1), quadrupole (E2), and octupole (E3)) and magnetic-multipole (dipole (M1), quadrupole (M2), and octupole (M3)) transitions between 3l5l' excited and ground states in Ni-like ions with nuclear charges ranging from Z = 30 to 100. The calculations start from a 1s22s22p63s23p63d10} Dirac-Fock potential. First-order perturbation theory is used to obtain intermediate-coupling coefficients, and second-order RMBPT is used to determine the matrix elements. A detailed discussion of the various contributions to the dipole matrix elements and energy levels is given for nickellike tungsten (Z = 74). The contributions from negative-energy states are included in the second-order E1, M1, E2 M2, E3, and M3 matrix elements. The resulting transition energies and transition rates are compared with experimental values and with results from other recent calculations. These atomic data are important in modeling of M-shell radiation spectra of heavy ions generated in electron beam ion trap experiments and in M-shell diagnostics of plasmas.
description: 21 pages, 8 figures, 11 tables
DNA fingerprinting in Rhododendrons using random amplified polymorphic DNA
Creators: name: Sakakibara, Stacey M.
Publisher: name: University of British Columbia
Year: 2009

description: The genus Rhododendron is one of the largest among the angiosperms, and has been the subject of intense interest in the horticultural field for the many species which are of commercial value. Hybrid rhododendrons are also valued, and many thousands of named cultivars have been registered with the International Rhododendron Registry. Rhododendrons make up an important sector of British Columbia's nursery industry, as they thrive in the mild climate of the Lower Mainland and Vancouver Island. The RAPD marker technique was applied in rhododendrons, first for DNA fingerprinting of commercial cultivars, and secondly, to study relationships within the genus For DNA fingerprinting, samples of rhododendron hybrids were obtained from Clay's Nursery in Langley, B.C. Reproducibility of the RAPD technique was established, as was clonal stability of the banding patterns generated. Thirteen RAPD primers were selected and used to generate RAPD banding patterns for the hybrid cultivars. Keys to identification of these cultivars were created based on the presence or absence of certain bands. The reproducibility of RAPDs coupled with the high level of polymorphism generated and the simplicity of the protocol makes the technique a good candidate for use in industry as a tool for quality control and identification of individuals whose identity may be in question. RAPDs were also evaluated for use in parentage analysis in rhododendrons. However, the relatively high frequency of non-parental bands observed limits the usefulness of the technique to certain situations in which there are only a few putative parents. For the taxonomic study, samples were collected from species in subsection Fortunea, as well as from some species thought to be related, and from an outgroup species. Cluster analysis on RAPD data generated from these samples did not give any evidence for the postulated relationships, but did highlight some other relationships. Individuals of the same species were generally clustered together, and individuals of the outgroup species were clustered in a distinct group from the other species. No distinctions were observed between species from more closely related subsections, however, which gives rise to questions regarding the current classification of Rhododendron. Further work is required to clarify and define these relationships.
Small angle neutron scattering study of the step-like magnetic transformation in Pr0.70Ca0.30MnO3
Creators: name: Saurel, D.
name: Simon, Ch.
name: Brulet, A.
name: Heinemann, A.
name: Martin, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Small angle neutron scattering (SANS) magnetic and electrical transport measurements were performed to study a single crystal of Pr0.7Ca0.3MnO3, a colossal magnetoresistive (CMR) material. While the magnetic field induced transformation of this phase separated compound consisting of an antiferromagnetic insulating phase (AFI) and a ferromagnetic insulating phase (FI), is continuous at high temperature (above 5K), at lower temperature a step like transformation is observed (around 5T at 2K). Macroscopic magnetization measurements and SANS indicate that this transformation occurs by the formation of mesoscopic ferromagnetic metallic (FM) domains in the AFI phase, and, eventually, in the FI phase. Although above 5K this transformation is continuous, below 5K a magnetization step marks the abrupt transition from a large scale FI/AFI phase separation to a large scale phase separation between AFI, FI and FM phases. Our results suggest that relaxation of elastic strains inherent to the coexistence of these different phases plays a crucial role in the mechanism of these transformations. The occurrence of magnetization steps could result from an intrinsic behavior of the AFI phase at low temperature.
Joint Identification through Hybrid Models Improved by Correlations
Creators: name: Saeed, Zeeshan
name: Firrone, Christian Maria
name: Berruti, Teresa Maria
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In mechanical systems coupled with joints, accurate prediction of the joint characteristics is extremely important. Despite years of research, a lot is yet to be learnt about the joints' interface dynamics. The problem becomes even more difficult when the interface Degrees-of-Freedom (DoF) are inaccessible for Frequency Response Function (FRF) measurements. This is, for example, the case of bladed-disk systems with dove-tail or fir-tree type joints. Therefore, an FRF based expansion method called System Equivalent Model Mixing (SEMM) is used to obtain expanded interface dynamics. The method uses numerical and experimental sub-models of each component and their assembly to produce the respective expanded or hybrid sub-models. By applying substructure decoupling to these sub-models, the joint can be identified. However, the joint can be noisy due to expansion and measurement errors which propagate to the hybrid sub-models. In this paper, a correlation based approach is proposed in the SEMM method wherein the quality of the expanded sub-models is improved. In this new approach, several expanded models are generated systematically using different combinations of the experimental FRFs and computing a parameter, Frequency Response Assurance Criteria (FRAC), to evaluate quality of the contribution of the different measurements. The lowest correlated channels or FRFs can be filtered out based on a certain threshold value of FRAC. Using the improved hybrid sub-models, the joint identification also shows a remarkable improvement. The test object for the method is an assembly of disk and one blade with a dove-tail joint.
description: 42 pages. Post-print (accepted author's manuscript) submitted to Elsevier's Journal of Sound and Vibration
Recensione a Enrico BRANCOZZI, Rifare i preti. Come ripensare i seminari, Prefazione di Erio Castellucci, EDB, Bologna 2021
Creators: name: Galati, Antonio
Publisher: name: Istituto Teologico Leoniano di Anagni
Year: 2022

description: Recensione a Enrico BRANCOZZI, Rifare i preti. Come ripensare i seminari, Prefazione di Erio Castellucci, EDB, Bologna 2021
The Volume-Complete Sample of M Dwarfs with Masses 0.1 <= M/M_sol <= 0.3 within 15 Parsecs
Creators: name: Winters, Jennifer G.
name: Charbonneau, David
name: Henry, Todd J.
name: Irwin, Jonathan M.
name: Jao, Wei-Chun
name: Riedel, Adric R.
name: Slatten, Kenneth
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: M dwarfs with masses 0.1 <= M/M_sol <= 0.3 are under increasing scrutiny because these fully convective stars pose interesting astrophysical questions regarding their magnetic activity and angular momentum history. They also afford the most accessible near-future opportunity to study the atmospheres of terrestrial planets. Because they are intrinsically low in luminosity, the identification of the nearest examples of these M dwarfs is essential for progress. We present the volume-complete, all-sky list of 512 M dwarfs with masses 0.1 <= M/M_sol <= 0.3 and with trigonometric distances placing them within 15 pc (parallax >= 66.67 mas) from which we have created a sample of 413 M dwarfs for spectroscopic study. We present the mass function for these 512 M dwarfs, which increases with decreasing stellar mass in linear mass space, but is flat in logarithmic mass space. As part of this sample, we present new VRI photometry for 17 targets, measured as a result of the RECONS group's long-term work at the CTIO/SMARTS 0.9m telescope. We also note the details of targets that are known to be members of multiple systems and find a preliminary multiplicity rate of 21 +/- 2% for the primary M dwarfs in our sample, when considering known stellar and brown dwarf companions at all separations from their primaries. We further find that 43 +/- 2% of all M dwarfs with masses 0.1 <= M/M_sol <= 0.3 are found in multiple systems with primary stars of all masses within 15 pc.
description: Accepted for publication in the Astronomical Journal. 22 pages, 8 figures, 4 tables. Tables 3 & 4 available at www.cfa.harvard.edu/~jwinters
Onboard catalogue of known X-ray sources for SVOM/ECLAIRs
Creators: name: Dagoneau, N.
name: Schanne, S.
name: Rodriguez, J.
name: Atteia, J. -L.
name: Cordier, B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The SVOM mission under development will carry various instruments, and in particular the coded-mask telescope ECLAIRs, with a large field of view of about 2 sr, operating in the 4--150 keV energy band, whose goal is to detect high energy transients such as gamma-ray bursts. The trigger software onboard ECLAIRs will search for new hard X-ray sources appearing in the sky, as well as peculiar behaviour (e.g. strong outbursts) from known sources, in order to repoint the satellite to perform follow-up observations with its onboard narrow field of view instruments. The presence of known X-ray sources must be disentangled from the appearance of new sources. This is done with the help of an onboard source catalogue, which we present in this paper. As an input we use catalogues of X-ray sources detected by Swift/BAT and MAXI/GSC and we study the influence of the sources on ECLAIRs' background level and on the quality of the sky image reconstruction process. We show that the influence of the sources depends on the pointing direction on the sky, on the energy band and on the exposure time. In the Galactic centre, the known sources contribution largely dominates the cosmic X-ray background, which is, on the contrary, the main background in sky regions empty of strong sources. We also demonstrate the need to clean the sources contributions in order to maintain a low noise level in the sky images and to keep the threshold applied for the detection of new sources as low as possible, without introducing false triggers. We briefly describe one of our cleaning methods and its challenges. Finally, we present the overall structure of the onboard catalogue and the way it will be used to perform the source cleaning and disentangle the detections of new sources from outbursts of known sources.
description: Accepted in Astronomy & Astrophysics, section 13. Astronomical instrumentation. Additional data to be archived at CDS
Quantum gravitational optics: Effective Raychaudhuri equation
Creators: name: Ahmadi, N.
name: Nouri-Zonoz, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Vacuum polarization in QED in a background gravitational field induces interactions which {\it effectively} modify the classical picture of light rays, as the null geodesics of spacetime. These interactions violate the strong equivalence principle and affect the propagation of light leading to superluminal photon velocities. Taking into account the QED vacuum polarization, we study the propagation of a bundle of rays in a background gravitational field. To do so we consider the perturbative deformation of Raychaudhuri equation through the influence of vacuum polarization on photon propagation. We analyze the contribution of the above interactions to the optical scalars namely, shear, vorticity and expansion using the Newman-Penrose formalism.
description: 17 pages, 1 figure, RevTex format, Replaced with the published version
Beinert, Wolfgang und Kühn, Ulrich: Ökumenische Dogmatik
Creators: name: Hailer, Martin
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 63 Nr. 1 (2014): Ökumenische Rundschau, Band 63, Heft 1
Episodic accretion in focus: revealing the environment of FU Orionis-type stars
Creators: name: Fehér, O.
name: Kóspál, Á.
name: Ábrahám, P.
name: Hogerheijde, M. R.
name: Brinch, Ch.
name: Semenov, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The earliest phases of star formation are characterised by intense mass accretion from the circumstellar disk to the central star. One group of young stellar objects, the FU Orionis-type stars exhibit accretion rate peaks accompanied by bright eruptions. The occurrence of these outbursts might solve the luminosity problem of protostars, play a key role in accumulating the final star mass, and have a significant effect on the parameters of the envelope and the disk. In the framework of the Structured Accretion Disks ERC project, we are conducting a systematic investigation of these sources with millimeter interferometry to examine whether they represent normal young stars in exceptional times or they are unusual objects. Our results show that FU Orionis-type stars can be similar to both Class I and Class II systems and may be in a special evolutionary phase between the two classes with their infall-driven episodic eruptions being the main driving force of the transition.
description: 4 pages, 2 figures
Examining the Relationship Between Convective Core Overshoot and Stellar Properties Using Asteroseismology
Creators: name: Viani, Lucas S.
name: Basu, Sarbani
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Core overshoot is a large source of uncertainty in constructing stellar models. Whether the amount of overshoot is constant or mass dependent is not completely known, even though models sometimes assume a mass-based trend. In this work we use asteroseismic data from stars observed by \textit{Kepler} to investigate the relationship between various stellar properties and the amount of overshoot needed to properly model a given star. We find a strong positive trend between stellar mass and overshoot amount for stars between 1.1 and 1.5 $M_\odot$, with a slope of 0.89. Additionally, we investigate how inferred stellar properties change as a function of overshoot. Our model grids show that the inferred stellar mass and radius can vary by as much as 14\% and 6\% respectively, depending on the extent of overshoot. This mass spread results in a commensurate spread in the ages.
description: 19 pages, 15 figures, accepted for publication in ApJ
An Extended Model for the Evolution of Prebiotic Homochirality: A Bottom-Up Approach to the Origin of Life
Creators: name: Gleiser, Marcelo
name: Walker, Sara Imari
Publisher: name: arXiv
Year: 2008
Subjects: subject: Biomolecules (q-bio.BM)
subject: Astrophysics (astro-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A generalized autocatalytic model for chiral polymerization is investigated in detail. Apart from enantiomeric cross-inhibition, the model allows for the autogenic (non-catalytic) formation of left and right-handed monomers from a substrate with reaction rates $ε_L$ and $ε_R$, respectively. The spatiotemporal evolution of the net chiral asymmetry is studied for models with several values of the maximum polymer length, N. For N=2, we study the validity of the adiabatic approximation often cited in the literature. We show that the approximation obtains the correct equilibrium values of the net chirality, but fails to reproduce the short time behavior. We show also that the autogenic term in the full N=2 model behaves as a control parameter in a chiral symmetry- breaking phase transition leading to full homochirality from racemic initial conditions. We study the dynamics of the N -> infinity model with symmetric ($ε_L = ε_R$) autogenic formation, showing that it only achieves homochirality for $ε< ε_c$, where $ε_c$ is an N-dependent critical value. For $ε\leq ε_c$ we investigate the behavior of models with several values of N, showing that the net chiral asymmetry grows as tanh(N). We show that for a given symmetric autogenic reaction rate, the net chirality and the concentrations of chirally pure polymers increase with the maximum polymer length in the model. We briefly discuss the consequences of our results for the development of homochirality in prebiotic Earth and possible experimental verification of our findings.
Gräbig, Ulrich und Schreiner, Martin (Hrsg.): Mitten ins Leben
Creators: name: Matthei, Ulrich
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 63 Nr. 1 (2014): Ökumenische Rundschau, Band 63, Heft 1
Information clues : content analysis of document representations retrieved by the Web search engines Altavista, Infoseek Ultra, Lycos and Open text index
Creators: name: Epp, Mary Anne
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this thesis is to identify and quantify the information clues found in the document representations in the World Wide Web environment. This study uses three topics to find document representations: custom publishing, distance education, and tactile graphics. Four Web search engines are used: AltaVista, InfoSeek Ultra, Lycos, and Open Text Index. The findings of the random sample show that the search engines produce little duplication in their display of the results. Just over half of the cases reveal information clues about the document's authorship, origin, format or subject. The summary field shows the highest number of information clues. The title and Uniform Resource Locator fields do not contain many information clues. Few of the fields contain clues about the authorship of the documents. Topical relevance is questionable in many of the cases. The study recommends further research on the comparison of search engines, on the study of searches on the Web for commercial, academic and personal topics, and on information seeking behaviors relating to Web searching. Recommendations are made for Web training and Web page design to assist users in finding relevant information more quickly.
The Application of Fuzzy Logic to the Construction of the Ranking Function of Information Retrieval Systems
Creators: name: Rubens, Neil
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The quality of the ranking function is an important factor that determines the quality of the Information Retrieval system. Each document is assigned a score by the ranking function; the score indicates the likelihood of relevance of the document given a query. In the vector space model, the ranking function is defined by a mathematic expression. We propose a fuzzy logic (FL) approach to defining the ranking function. FL provides a convenient way of converting knowledge expressed in a natural language into fuzzy logic rules. The resulting ranking function could be easily viewed, extended, and verified: * if (tf is high) and (idf is high) > (relevance is high); * if (overlap is high) > (relevance is high). By using above FL rules, we are able to achieve performance approximately equal to the state of the art search engine Apache Lucene (deltaP10 +0.92%; deltaMAP -0.1%). The fuzzy logic approach allows combining the logic-based model with the vector model. The resulting model possesses simplicity and formalism of the logic based model, and the flexibility and performance of the vector model.