cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hiding neutrinoless double beta decay in the minimal seesaw mechanism
Creators: name: Asaka, Takehiko
name: Ishida, Hiroyuki
name: Tanaka, Kazuki
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a possibility that the neutrinoless double beta decay can be hidden in the minimal seesaw mechanism where the standard model is extended by two right-handed neutrinos which have a hierarchical mass structure. In this framework, the lepton number is violated due to the massive Majorana neutrinos. Especially, we investigate the case that the heavier right-handed neutrino is sufficiently heavy to decouple from the decay while the lighter one is lighter enough than the typical Fermi-momentum scale of nuclei and gives a sizable contribution to the decay. Under the specific condition on mixing elements, the lighter right-handed neutrino can give a significant destructive contribution which suppresses or even hides to the effective mass of the neutrinoless double beta decay. In this case, the flavor structure of the mixing element of the lighter right-handed neutrino with ordinary neutrinos is predicted depending on the Majorana CP violating phase of active neutrinos.
description: 6 pages, 2 figures, v2 version published in PRD
Expansion of the universe from a 5D vacuum within a nonperturbative scalar field formalism
Creators: name: Montano, Alfredo Raya
name: Aguilar, Jose Edgar Madriz
name: Bellini, Mauricio
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the dynamics of the quantum scalar field responsible for inflation in different epochs of the evolution of the universe by using a recently introduced nonperturbative formalism from a 5D apparent vacuum.
description: version to be published in Advanced Studies in Theoretical Physics
Properties of hadron and quark matter studied with a molecular dynamics
Creators: name: Akimura, Y.
name: Maruyama, T.
name: Yoshinaga, N.
name: Chiba, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the hadron-quark phase transition in a molecular dynamics (MD) of quark degrees of freedom. The hadron state at low density and temperature, and the deconfined quark state at high density and temperature are observed in our model. We investigate the equations of state and draw the phase-diagram at wide baryon density and temperature range. We also discuss the transport property, e.g. viscosity, of $q\bar{q}$ matter. It is found that the ratio of the shear viscosity to the entropy density is less than one for quark matter.
description: Poster presentation at Quark Matter 2005
Zippert, Christian: Abendmahl - Gottesdienste, Predigten, Gebete
Creators: name: Vo.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 4 (1987): Ökumenische Rundschau, Band 36, Heft 4
Unusual Exchange Bias Associated with Phase Separation in Perovskite Cobaltites
Creators: name: Sun, Young
name: Tang, Yan-kun
name: Cheng, Zhao-hua
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the observation of unusual exchange bias phenomena in the doped perovskite cobaltites La_{1-x}Sr_{x}CoO_{3} (x = 0.15, 0.18, and 0.30) in which a spontaneous phase separation into ferromagnetic clusters embedded in a non-ferromagnetic matrix occurs. When the La_{1-x}Sr_{x}CoO_{3} samples are cooled in a static magnetic field through a freezing temperature, the magnetization hysteresis loops exhibit exchange bias, i.e., the loops shift to the negative field and the magnetization becomes asymmetric. Moreover, exchange bias disappears when the measuring magnetic field is high enough. These results suggest that the intrinsic phase inhomogeniety in a spontaneously phase-separated system may induce an interfacial exchange anisotropy after a field cooling. The diminution of exchange bias in high magnetic fields is ascribed to the propagation of ferromagnetic regions with increasing magnetic field.
description: 17 pages, 5 figures
A pamphlet on motivic cohomology
Creators: name: Barbieri-Viale, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: This short note is an "elementary'' introduction to the conjectural theory of motives.
description: 19 pages, to appear on Milan Journal of Math
A compact ion-trap quantum computing demonstrator
Creators: name: Pogorelov, Ivan
name: Feldker, Thomas
name: Marciniak, Christian D.
name: Postler, Lukas
name: Jacob, Georg
name: Krieglsteiner, Oliver
name: Podlesnic, Verena
name: Meth, Michael
name: Negnevitsky, Vlad
name: Stadler, Martin
name: Höfer, Bernd
name: Wächter, Christoph
name: Lakhmanskiy, Kirill
name: Blatt, Rainer
name: Schindler, Philipp
name: Monz, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. Transitioning from lab-based, proof-of-concept experiments to robust, integrated realizations of quantum information processing hardware is an important step in this process. However, the nature of traditional laboratory setups does not offer itself readily to scaling up system sizes or allow for applications outside of laboratory-grade environments. This transition requires overcoming challenges in engineering and integration without sacrificing the state-of-the-art performance of laboratory implementations. Here, we present a 19-inch rack quantum computing demonstrator based on $^{40}\textrm{Ca}^+$ optical qubits in a linear Paul trap to address many of these challenges. We outline the mechanical, optical, and electrical subsystems. Further, we describe the automation and remote access components of the quantum computing stack. We conclude by describing characterization measurements relevant to digital quantum computing including entangling operations mediated by the Molmer-Sorenson interaction. Using this setup we produce maximally-entangled Greenberger-Horne-Zeilinger states with up to 24 ions without the use of post-selection or error mitigation techniques; on par with well-established conventional laboratory setups.
Formation and dynamics of water clouds on temperate sub-Neptunes: The example of K2-18b
Creators: name: Charnay, Benjamin
name: Blain, Doriann
name: Bézard, Bruno
name: Leconte, Jérémy
name: Turbet, Martin
name: Falco, Aurélien
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Hubble (HST) spectroscopic transit observations of the temperate sub-Neptune K2-18b were interpreted as the presence of water vapour with potential water clouds. 1D modelling studies also predict the formation of water clouds at some conditions. However, such models cannot predict the cloud cover, driven by atmospheric dynamics and thermal contrasts, and thus their real impact on spectra. The main goal of this study is to understand the formation, distribution and observational consequences of water clouds on K2-18b and other temperate sub-Neptunes. We simulated the atmospheric dynamics, water cloud formation and spectra of K2-18b for H2-dominated atmosphere using a 3D GCM. We analysed the impact of atmospheric composition (with metallicity from 1*solar to 1000*solar), concentration of cloud condensation nuclei and planetary rotation rate. Assuming that K2-18b has a synchronous rotation, we show that the atmospheric circulation in the upper atmosphere essentially corresponds to a symmetric day-to-night circulation. This regime preferentially leads to cloud formation at the substellar point or at the terminator. Clouds form for metallicity >100*solar with relatively large particles. For 100-300*solar metallicity, the cloud fraction at the terminators is small with a limited impact on transit spectra. For 1000*solar metallicity, very thick clouds form at the terminator. The cloud distribution appears very sensitive to the concentration of CCN and to the planetary rotation rate. Fitting HST transit data with our simulated spectra suggests a metallicity of ~100-300*solar. In addition, we found that the cloud fraction at the terminator can be highly variable, leading to a potential variability in transit spectra. This effect could be common on cloudy exoplanets and could be detectable with multiple transit observations.
description: Accepted for publication in A&A. 16 pages, 14 figures
Primary health care and maternal, infant and child health of Western Australia
Creators: name: McAullay, Daniel
Publisher: name: The Australian National University
Year: 2010
Subjects: subject: RA427.9 .M43 2010
subject: Primary health care Australia Western Australia
subject: Maternal health services Australia Western Australia
subject: Child health services Australia Western Australia
subject: Infant health services Australia Western Australia

description: There is strong evidence that supports the importance of focusing health care in the early years to ensure that health throughout the lifecourse is the best it can be. There is also evidence to support the important role primary health care has in contributing to care during this time. Within Western Australia, there are no specific examples of work that have examined the contribution of primary health care services to maternal, infant and child health. The aim of this descriptive epidemiological study was to investigate what contribution primary health care has made to the maternal, infant and child health of selected communities in Western Australia. Using a mixture of quantitative and qualitative methods, selected maternal, infant and child health outcomes were mapped to 155 SLA defined geographically sites across Western Australia. These sites were then ranked from top to bottom according to the outcomes mapped. Of these sites, nine were chosen as case study sites. Key informants within these case study sites representing General Practice care, Government health care and the Aboriginal primary health care settings were interviewed. Information collected from these interviews described how and in which context services were delivered in the areas of maternal, infant and child health. The results of the study indicated that across Western Australia there is a striking lack of consistency in maternal, infant and child primary health care. The primary health care contribution to maternal, infant and child health is ad hoc and lacking of consistent policy, planning and programming. However, there are examples where the contribution of primary health care exhibits appropriate policy, planning and program linkage. Aboriginal primary health care for example, in particular the Healthy for Life program shows how policy and planning associated with a funded program has resulted in care in the area of maternal health across several study sites. The study also indicated the important influencing factor that social determinants of health may play in contributing to maternal, infant and child health across Western Australia. The study findings highlight that there is a need to ensure that when planning for policy and program implementation of maternal, infant and child primary health care, existing models such as the Healthy for Life program should be examined. The study also indicated the importance of incorporating factors outside of health into policy and program planning.
Statistical Mechanics of Low Angle Grain Boundaries in Two Dimensions
Creators: name: Zhang, Grace H.
name: Nelson, David R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We explore order in low angle grain boundaries (LAGBs) embedded in a two-dimensional crystal at thermal equilibrium. Symmetric LAGBs subject to a periodic Peierls potential undergo, with increasing temperatures, a thermal depinning transition, above which the potential is irrelevant at long wavelengths and the LAGB exhibits transverse fluctuations that grow logarithmically with inter-dislocation distance. Longitudinal fluctuations lead to a series of melting transitions marked by the sequential disappearance of diverging algebraic Bragg peaks with universal critical exponents. Aspects of our theory are checked by a mapping onto random matrix theory.
description: 6+5 pages, 3+1 figures
Gundert, Wilhelm: Geschichte der deutschen Bibelwissenschaften im 19. Jahrhundert
Creators: name: Krüger, Hanfried
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 4 (1987): Ökumenische Rundschau, Band 36, Heft 4
Knight Shift and Nuclear Spin Relaxation Rate in a Charge-Ordered State of the One-Dimensional Extended Hubbard Model at Quarter Filling
Creators: name: Yoshioka, Hideo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate Knight shift and nuclear spin relaxation rate in a charge ordered state of the one-dimensional extended Hubbard model with a quarter filled band by using RPA around the mean-field solution. It is shown that both quantities show splitting below the critical temperature of the charge order, as is experimentally observed. The relationship between the mount of the splitting in the both quantities and the charge disproportionation rate is discussed.
description: 7 pages, 6 figures, submitted to J. Phys. Soc. Jpn
title: Mussel-inspired microgels with improved mechanical and adhesive properties
Creators: name: Forg, Sandra
Publisher: name: UNSPECIFIED
Year: 2024

description: This thesis aims to develop microgels with improved adhesive and mechanical properties by drawing inspiration from the remarkable under-water adhesion of mussels. The synthesised microgels are based on poly(N-isopropylacrylamide) (PNIPAM), known for its temperature-responsive behaviour. Dopamine methacrylamide (DMA) can be used as a co-monomer to mimic the mussel’s properties. Due to its catechol group, it is capable of cross-linking microgel structures. However, its scavenging ability demands a precise synthesis control.

In the first part of this thesis, the microgel synthesis is analysed and controlled through kinetic studies. Time-samples, taken during the synthesis, are evaluated by using mass spectrometry (MS) to determine the individual monomer consumption rates. The incorporation of DMA is quantified using UV-vis and nuclear magnetic resonance (NMR) spectroscopy. An optimised synthesis protocol is developed: A DMA injection after 15 min ensures the full NIPAM and cross-linker N,N’-methylene-bisacrylamide (BIS) consumption, while an overall synthesis reaction time of 60 min guarantees the DMA incorporation. The synthesis is reproducible and independent of UV light. DMA exhibits second-order reaction kinetics.
In the second part, the temperature-dependent swelling behaviour of P(NIPAM-co-DMA) microgels with varying DMA incorporations is analysed: DMA lowers the volume phase transition temperature (VPTT) due to its higher hydrophobicity when compared to NIPAM and sharpens the transition itself. Force spectroscopy measurements on single adsorbed microgel particles reveal that the incorporation of DMA stiffens PNIPAM microgels over their entire cross-section. The swelling behaviour and mechanical properties are linearly correlated as predicted by the affine network model for both types of microgels. Nonetheless, when a large amount of DMA is incorporated, catechol interactions within the network inhibit the shrinking of the microgel, while maintaining its high mechanical stiffness.
In the final part of this thesis, the adhesive properties of the microgels are characterised by colloidal probe atomic force microscopy (AFM) on monolayers of microgels prepared by the Langmuir-Blodgett technique. P(NIPAM-co-DMA) microgels exhibit superior adhesion when compared to pure PNIPAM microgels. Adhesive forces reach their maximum at 10 mol% DMA content. However, higher DMA amounts lead to reduced adhesive but increased mechanical properties - this highlights the delicate balance between the material’s cohesive and adhesive properties. When further increasing the packing densities of microgel particles, the adhesion of P(NIPAM-co-DMA) microgels decreases, possibly due to catechol interactions within the densely compressed microgels.
Orbital Disordering and metal-insulator transition with hole-doping in perovskite-type vanadium oxides
Creators: name: Fujioka, J.
name: Miyasaka, S.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Filling-control metal-insulator transitions (MITs) and related electronic phase diagrams have been investigated for hole-doped vanadium oxides, Pr_{1-x}Ca_xVO_3, Nd_{1-x}Sr_xVO_3 and Y_{1-x}Ca_xVO_3, with perovskite structure. The increase of the doping level x causes the melting of the G-type (and C-type) orbital order, prior to or concomitantly with the MIT, due partly to the doped-hole motion and partly to the ramdom potential arising from the quenched disorder. In particular, the G-type spin- and C-type orbital-ordered phase present in Y_{1-x}Ca_xVO_3 disappears immediately upon hole doping, around x=0.02. On the other hand, the critical doping level x for MIT is governed by the electron-correlation strength of the undoped parent compound.
description: 9pages, 4figures
Sensitivity of the Cherenkov Telescope Array to dark subhalos
Creators: name: Coronado-Blázquez, Javier
name: Doro, Michele
name: Sánchez-Conde, Miguel A.
name: Aguirre-Santaella, Alejandra
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this work, we study the potential of the Cherenkov Telescope Array (CTA) for the detection of Galactic dark matter (DM) subhalos. We focus on low-mass subhalos that do not host any baryonic content and therefore lack any multiwavelength counterpart. If the DM is made of weakly interacting massive particles (WIMPs), these dark subhalos may thus appear in the gamma-ray sky as unidentified sources. A detailed characterization of the instrumental response of CTA to dark subhalos is performed, for which we use the {\it ctools} analysis software and simulate CTA observations under different array configurations and pointing strategies, such as the scheduled extragalactic survey. This, together with information on the subhalo population as inferred from N-body cosmological simulations, allows us to predict the CTA detectability of dark subhalos, i.e., the expected number of subhalos in each of the considered observational scenarios. In the absence of detection, for each observation strategy we set competitive limits to the annihilation cross section as a function of the DM particle mass, that are at the level of $\langleσv\rangle\sim4\times10^{-24}$ ($7\times10^{-25}$) $\mathrm{cm^3s^{-1}}$ for the $b\bar{b}$ ($τ^+τ^-$) annihilation channel in the best case scenario. Interestingly, we find the latter to be reached with no dedicated observations, as we obtain the best limits by just accumulating exposure time from all scheduled CTA programs and pointings over the first 10 years of operation. This way CTA will offer the most constraining limits from subhalo searches in the intermediate range between $\sim 1-3$ TeV, complementing previous results with \textit{Fermi}-LAT and HAWC at lower and higher energies, respectively.
description: 17 pages, 12 figures. Accepted in Physics of the Dark Universe. Matches the published version
USE OF INNOVATIVE PEDAGOGICAL TECHNOLOGIES IN EDUCATION
Creators: name: Sultanqulova G.F., Tillaboyev M.
Publisher: name: Zenodo
Year: 2025

description: Abstract: This article discusses innovative pedagogical technologies and their effective, step-by-step use in education, the importance of pedagogical technologies in  the process of education and upbringing, as well as the importance of pedagogical technologies and pedagogical skills, as well as the methodological basis for the study of related processes.
Monika von Wilmowsky; Ernst Rietschel als Bildhauer. Mit einem Katalog der Bildwerke. Bd. 1: Leben und Werk. Bd. 2: Werkverzeichnis
Creators: name: Badstübner-Gröger, Sibylle
Publisher: name: Journal für Kunstgeschichte
Year: 2024

description: Rezension zu: Monika von Wilmowsky; Ernst Rietschel als Bildhauer. Mit einem Katalog der Bildwerke. Bd. 1: Leben und Werk. Bd. 2: Werkverzeichnis (LETTER Schiften Band 22); Köln: LETTER Stiftung 2017; Bd 1: 174 + 57 S., 32 s/w- u.106 farb. Abb.; Bd 2: 604 S., 1 036 s/w-Abb.; 2 Bände im Schuber mit DVD-Rom mit Katalog- und weiteren Abbildungen; ISBN 978-3-930633-17-3
description: Journal für Kunstgeschichte, Bd. 24 Nr. 1 (2020): Journal für Kunstgeschichte
Regge theory and statistical mechanics
Creators: name: Canfora, F.
name: Parisi, L.
name: Vilasi, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An interesting connection between the Regge theory of scattering, the Veneziano amplitude, the Lee-Yang theorems in statistical mechanics and nonextensive Renyi entropy is addressed. In this scheme the standard entropy and the Renyi entropy appear to be different limits of a unique mathematical object. This framework sheds light on the physical origin of nonextensivity. A non trivial application to spin glass theory is shortly outlined.
description: To appear on Physics Letters B. 10 pages, no figures, references added
Scalar Perturbations of a Single-Horizon Regular Black Hole
Creators: name: Daghigh, Ramin G.
name: Green, Michael D.
name: Morey, Jodin C.
name: Kunstatter, Gabor
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the massless scalar field perturbations, including the quasinormal mode spectrum and the ringdown waveform, of a regular black hole spacetime that was derived via the Loop Quantum Gravity inspired polymer quantization of spherical $4$D black holes. In contrast to most, if not all, of the other regular black holes considered in the literature, the resulting nonsingular spacetime has a single bifurcative horizon and hence no mass inflation. In the interior, the areal radius decreases to a minimum given by the Polymerization constant, $k$, and then re-expands into a Kantowski-Sachs universe. We find indications that this black hole model is stable against small scalar perturbations. We also show that an increase in the magnitude of $k$ will decrease the height of the QNM potential and gives oscillations with lower frequency and less damping.
description: 17 pages, 14 figures, accepted for publication in PRD
Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
Creators: name: Komatsu, Nobuyoshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Density perturbations related to structure formations are expected to be different in dissipative and non-dissipative universes, even if the background evolution of the two universes is the same. To clarify the difference between the two universes, first-order density perturbations are studied, using two types of holographic cosmological models. The first type is a "$Λ(t)$ model" similar to a time-varying $Λ(t)$ cosmology for the non-dissipative universe. The second type is a "BV model" similar to a bulk viscous cosmology for the dissipative universe. To systematically examine the two different universes, a power-law term proportional to $H^α$ is applied to the $Λ(t)$ and BV (bulk-viscous-cosmology-like) models, assuming a flat Friedmann--Robertson--Walker model for the late universe. Here, $H$ is the Hubble parameter and $α$ is a free parameter whose value is a real number. The $Λ(t)$-$H^α$ and BV-$H^α$ models are used to examine first-order density perturbations for matter, in which the background evolution of the two models is equivalent. In addition, thermodynamic constraints on the two models are discussed, with a focus on the maximization of entropy on the horizon of the universe, extending previous analyses [Phys. Rev. D 100, 123545 (2019) (arXiv:1911.08306); 102, 063512 (2020) (arXiv:2006.09650)]. Consequently, the $Λ(t)$-$H^α$ model for small $|α|$ values is found to be consistent with observations and satisfies the thermodynamic constraints, compared with the BV-$H^α$ model. The results show that the non-dissipative universe described by the $Λ(t)$-$H^α$ model similar to lambda cold dark matter models is likely favored.
description: Final version accepted for publication in PRD. A typo is corrected. [17 pages, 8 figures]
Large N_c in Chiral Resonance Lagrangians
Creators: name: Kaiser, Roland
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the first part of the talk, I discussed results on the determination of the ratios of the light quark masses from large N_c chiral perturbation theory, to be described elsewhere. The following notes contain material from the second part of the talk, which concerns the implications of large N_c for resonance dominance estimates of the low energy coupling constants in chiral perturbation theory.
description: Alteration of notation. Various typos and 2 entries in Table 2 corrected. Note and references added. 17 pages. Proceedings of the ECT* Workshop on Large N_c QCD, Trento, Italy, July 5-9 2004
Muon identification in a compact single-layered water Cherenkov detector and gamma/hadron discrimination using Machine Learning techniques
Creators: name: Conceição, R.
name: González, B. S.
name: Guillén, A.
name: Pimenta, M.
name: Tomé, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The muon tagging is an essential tool to distinguish between gamma and hadron-induced showers in wide field-of-view gamma-ray observatories. In this work, it is shown that an efficient muon tagging (and counting) can be achieved using a water Cherenkov detector with a reduced water volume and 4 PMTs, provided that the PMT signal spatial and time patterns are interpreted by an analysis based on Machine Learning (ML). The developed analysis has been tested for different shower and array configurations. The output of the ML analysis, the probability of having a muon in the WCD station, has been used to notably discriminate between gamma and hadron induced showers with $S/ \sqrt{B} \sim 4$ for shower with energies $E_0 \sim1\,$TeV. Finally, for proton-induced showers, an estimator of the number of muons was built by means of the sum of the probabilities of having a muon in the stations. Resolutions about $20\%$ and a negligible bias are obtained for vertical showers with $N_μ > 10$.
description: 11 pages, 9 figures; to appear in EPJC
Anisotropic Magneto-Thermopower: the Contribution of Interband Relaxation
Creators: name: Wegrowe, J. -E.
name: Nguyen, Q. Anh
name: Al-Barki, M.
name: Dayen, J. -F.
name: Wade, T. L.
name: Drouhin, H. -J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin injection in metallic normal/ferromagnetic junctions is investigated taking into account the anisotropic magnetoresistance (AMR) occurring in the ferromagnetic layer. It is shown, on the basis of a generalized two channel model, that there is an interface resistance contribution due to anisotropic scattering, beyond spin accumulation and giant magnetoresistance (GMR). The corresponding expression of the thermopower is derived and compared with the expression for the thermopower produced by the GMR. First measurements of anisotropic magnetothermopower are presented in electrodeposited Ni nanowires contacted with Ni, Au and Cu. The results of this study show that while the giant magnetoresistance and corresponding thermopower demonstrates the role of spin-flip scattering, the observed anisotropic magnetothermopower indicates interband s-d relaxation mechanisms.
description: 20 pages, 4 figures
EFFECTS OF AN EDUCATION INTERVENTION FOR THE HIGH-RISK OBSTETRIC CLIENTS.docx
Creators: name: odekks, sim
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420309
subject: Health management
classificationCode: 420311
subject: Health systems

description: Improving maternal health is one of the strategies towards universal health coverage entwined in the health systems management service delivery component, particularly in low- and middle-income countries (LMICs) like Kenya where maternal and neonatal mortality rates remain persistently high. Obstetric care is the practice of caring for women after conception, throughout pregnancy, and during childbirth. High-risk obstetric clients are more vulnerable to incidences of adverse maternal and neonatal outcomes. Approximately 8 women die every day in Kenya as a result of pregnancy-related complications and this ratio is even higher for high-risk obstetric women due to pre-existing medical conditions, pregnancy-related complications, or a history of difficult deliveries. The main objective of this study is to assess the effects of an education intervention for high risk obstetric clients on the utilization of maternal healthcare services in Nairobi County, Kenya. The study will adopt quasi experimental study design that will involve two groups chosen randomly.
Intrinsic degree-correlations in static model of scale-free networks
Creators: name: Lee, J. -S.
name: Goh, K. -I.
name: Kahng, B.
name: Kim, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We calculate the mean neighboring degree function $\bar k_{\rm{nn}}(k)$ and the mean clustering function $C(k)$ of vertices with degree $k$ as a function of $k$ in finite scale-free random networks through the static model. While both are independent of $k$ when the degree exponent $γ\geq 3$, they show the crossover behavior for $2 < γ< 3$ from $k$-independent behavior for small $k$ to $k$-dependent behavior for large $k$. The $k$-dependent behavior is analytically derived. Such a behavior arises from the prevention of self-loops and multiple edges between each pair of vertices. The analytic results are confirmed by numerical simulations. We also compare our results with those obtained from a growing network model, finding that they behave differently from each other.
description: 8 pages
Eikonal Methods in AdS/CFT: BFKL Pomeron at Weak Coupling
Creators: name: Cornalba, Lorenzo
name: Costa, Miguel S.
name: Penedones, Joao
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider correlators of N=4 super Yang Mills of the form A ~ < O_1 O_2 O*_1 O*_2 >, where the operators O_1 and O_2 are scalar primaries. In particular, we analyze this correlator in the planar limit and in a Lorentzian regime corresponding to high energy interactions in AdS. The planar amplitude is dominated by a Regge pole whose nature varies as a function of the 't Hooft coupling g^2. At large g, the pole corresponds to graviton exchange in AdS, whereas at weak g, the pole is that of the hard perturbative BFKL pomeron. We concentrate on the weak coupling regime and analyze pomeron exchange directly in position space. The analysis relies heavily on the conformal symmetry of the transverse space E^2 and of its holographic dual hyperbolic space H_3, describing with an unified language, both the weak and strong 't Hooft coupling regimes. In particular, the form of the impact factors is highly constrained in position space by conformal invariance. Finally, the analysis suggests a possible AdS eikonal resummation of multi-pomeron exchanges implementing AdS unitarity, which differs from the usual 4-dimensional eikonal exponentiation. Relations to violations of 4-dimensional unitarity at high energy and to the onset of nonlinear effects and gluon saturation become immediate questions for future research.
description: 42 pages, 13 figures
New identities with Stirling, hyperharmonic, and derangement numbers, Bernoulli and Euler polynomials, powers, and factorials
Creators: name: Boyadzhiev, Khristo N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B72

description: A number of identities are proved by using Stirling transforms. These identities involve Stirling numbers of the first and second kinds, hyperharmonic and derangement numbers, Bernoulli and Euler numbers and polynomials, powers, power sums, and factorials.
description: 20 pages
Rank one discrete valuations of power series fields
Creators: name: Govantes, F. J. Herrera
name: Acosta, M. A. Olalla
name: Cordoba, J. L. Vicente
Publisher: name: arXiv
Year: 2006
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: In this paper we study the rank one discrete valuations of the field $k((X_1,..., X_n))$ whose center in $k\lcor\X\rcor$ is the maximal ideal. In sections 2 to 6 we give a construction of a system of parametric equations describing such valuations. This amounts to finding a parameter and a field of coefficients. We devote section 2 to finding an element of value 1, that is, a parameter. The field of coefficients is the residue field of the valuation, and it is given in section 5. The constructions given in these sections are not effective in the general case, because we need either to use the Zorn's lemma or to know explicitly a section $σ$ of the natural homomorphism $R_v\to\d$ between the ring and the residue field of the valuation $v$. However, as a consequence of this construction, in section 7, we prove that $k((\X))$ can be embedded into a field $L((\Y))$, where $L$ is an algebraic extension of $k$ and the {\em ``extended valuation'' is as close as possible to the usual order function}.
Cliques and duplication-divergence network growth
Creators: name: Ispolatov, I.
name: Krapivsky, P. L.
name: Mazo, I.
name: Yuryev, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A population of complete subgraphs or cliques in a network evolving via duplication-divergence is considered. We find that a number of cliques of each size scales linearly with the size of the network. We also derive a clique population distribution that is in perfect agreement with both the simulation results and the clique statistic of the protein-protein binding network of the fruit fly. In addition, we show that such features as fat-tail degree distribution, various rates of average degree growth and non-averaging, revealed recently for only the particular case of a completely asymmetric divergence, are present in a general case of arbitrary divergence.
description: 7 pages, 6 figures
Self-driven criticality in a stochastic epidemic model
Creators: name: Ariel, Gil
name: Louzoun, Yoram
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We present a generic epidemic model with stochastic parameters, in which the dynamics self-organize to a critical state with suppressed exponential growth. More precisely, the dynamics evolve into a quasi-steady-state, where the effective reproduction rate fluctuates close to the critical value one, as observed for different epidemics. The main assumptions underlying the model are that the rate at which each individual becomes infected changes stochastically in time with a heavy-tailed steady state. The critical regime is characterized by an extremely long duration of the epidemic. Its stability is analyzed both numerically and analytically.
Theory of Fano effect in cavity quantum electrodynamics
Creators: name: Yamaguchi, Makoto
name: Lyasota, Alexey
name: Yuge, Tatsuro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a Markovian quantum master equation that can describe the Fano effect directly, by assuming a standard cavity quantum electrodynamics system. The framework allows us to generalize the Fano formula, applicable over the weak and strong coupling regimes with pure dephasing. A formulation of its emission spectrum is also given in a consistent manner. We then find that the interference responsible for the Fano effect is robust against pure dephasing. This is counterintuitive because the impact of interference is, in general, severely reduced by decoherence processes. Our approach thus provides a basis for theoretical treatments of the Fano effect and new insights into the quantum interference in open quantum systems.
Magnetic frustration in the sawtooth lattice of ZnLn2S4 (Ln = Er, Tm, Yb) olivines
Creators: name: Lau, G. C.
name: Ueland, B. G.
name: Freitas, R. S.
name: Dahlberg, M. L.
name: Schiffer, P.
name: Cava, R. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the magnetic properties of the ZnLn2S4 (Ln = Er, Tm, Yb) olivines, in which the magnetic lanthanide ions are in a potentially frustrated geometry consisting of sawtooth chains of corner-sharing triangles. Fits to the high temperature magnetic susceptibility yielded Curie-Weiss temperatures of theta ~ -4, -13, and -75 K for the Er, Tm, and Yb compounds respectively. Antiferromagnetic interactions indicated by these negative theta values, along with the absence of magnetic long range order above T = 1.8 K, suggest that geometrical frustration of magnetic ordering exists in these sulfide olivines as has been observed previously in the rare earth chalcogenide spinels.
description: 17 pages, 6 figures, submitted to Phys Rev B
A Brief Introduction to Particle Interactions
Creators: name: Chamseddine, Ali H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I give a brief introduction to particle interactions based on representations of Poincare Lie algebra. This is later generalized to interactions based on representations of the supersymmetry Lie algebra. Globally supersymmetric models with internal symmetry and locally supersymmetric models leading to supergravity theories are presented. I also discuss higher dimensional supergravity theories and some of their applications.
description: Series of lectures given at the Summer School "Dirac Operators: Yesterday and Today" held at CAMS, American University of Beirut, August 27-September 7, 2001. 37 pages
The Radio Luminosity-Risetime Function of Core-Collapse Supernovae
Creators: name: Bietenholz, Michael F.
name: Bartel, N.
name: Argo, M.
name: Dua, R.
name: Ryder, S.
name: Soderberg, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We assemble a large set of 2-10 GHz radio flux density measurements and upper limits of 294 different supernovae (SNe), from the literature and our own and archival data. Only 31% of the SNe were detected. We characterize the SN lightcurves near the peak using a two-parameter model, with $t_{\rm pk}$ being the time to rise to a peak and $L_{\rm pk}$ the spectral luminosity at that peak. Over all SNe in our sample at $D<100$ Mpc, we find that $t_{\rm pk} = 10^{1.7\pm0.9}$ d, and that $L_{\rm pk} = 10^{25.5\pm1.6}$ erg s$^{-1}$ Hz$^{-1}$, and therefore that generally, 50% of SNe will have $L_{\rm pk} < 10^{25.5}$ erg s$^{-1}$ Hz$^{-1}$. These $L_{\rm pk}$ values are ~30 times lower than those for only detected SNe. Types I b/c and II (excluding IIn's) have similar mean values of $L_{\rm pk}$ but the former have a wider range, whereas Type IIn SNe have ~10 times higher values with $L_{\rm pk} = 10^{26.5\pm1.1}$ erg s$^{-1}$ Hz$^{-1}$. As for $t_{\rm pk}$, Type I b/c have $t_{\rm pk}$ of only $10^{1.1\pm0.5}$ d while Type II have $t_{\rm pk} = 10^{1.6\pm1.0}$ and Type IIn the longest timescales with $t_{\rm pk} = 10^{3.1\pm0.7}$ d. We also estimate the distribution of progenitor mass-loss rates, $\dot M$, and find the mean and standard deviation of log$_{10}(\dot M/$Msol) yr$^{-1}$ are $-5.4\pm1.2$ (assuming $v_{\rm wind}=1000$ km s$^{-1}$) for Type I~b/c SNe, and $-6.9\pm1.4$ (assuming $v_{\rm wind} = 10$ km s$^{-1}$ for Type II SNe excluding Type IIn.
description: Accepted for publication in the Astrophysical Journal 15 Figures, 4 Tables; Full version of Table 1 in ancillary files. Minor revisions only from version 1
Low consistency refining of mechanical pulps
Creators: name: Welch, Lorrie V.S.
Publisher: name: University of British Columbia
Year: 2009

description: Mechanical pulping produces a much higher yield than its chemical counterpart. It has lower water and atmospheric effluent loads but requires a high level of energy input. There is a drive towards reducing energy use and costs through modifications to mechanical pulping equipment. The vast majority of research in the field of mechanical pulping focuses on the energy split between the first and second refiners in the production stages of pulping. This thesis examines an alternate process, low consistency refining, to see if there is a potential to improve mechanical pulp properties with this technique. The experimental work included production and examination through fibre and paper test of several groups of mechanical pulps. The results indicate that low consistency refining of mechanical pulp can produce paper quality similar to that of high consistency refining at reduced energy input levels. However, the conditions for low consistency refining, namely number and intensity of refining impacts, must be chosen carefully as too high an impact intensity can damage fibres and reduce paper quality. Individual fibres show similar development for high consistency and low-intensity low consistency refining. Most notably, average fibre length and the number of long fibres are kept at high levels to maintain the network strength of paper. Low consistency refining of latent thermomechanical (TMP) and chemithermomechanical (CTMP) pulps straightens fibres. If fibre curl is taken as a measure of latency removal, low consistency refining can achieve a delatent pulp without the separate step of latency removal. However, latent pulp may be more brittle resulting in lower paper strength. Low consistency refining of latent pulp may offer a usable alternative where a mill is limited by either space or latency removal equipment and lower paper strength is acceptable. With regards to flexibility testing, LC-refined TMP and CMP show changes in flexibility distribution when compared to base pulps. The coarser summerwood fibres seemed to be more affected by refining as measured by changes in flexibility. Much work was done to complete a fracture toughness analysis. The results proved to be strongly correlated to the tensile strength test results. Therefore this test may not offer new information regarding paper runnability and strength.
Quantum-classical correspondence in entanglement production: Entropy and classical tori
Creators: name: Zhang, Shi-hui
name: Jie, Quan-lin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the connections between entanglement dynamics and classical trajectories in a semiclassi-cal regime for two systems: A pair of coupled oscillators and the Jaynes-Cummings model. We find that entanglement production depends on classical invariant tori and such phenomenon is closely related to the power spectra of classical trajectories. Classical power spectrum with a larger number of frequency com-ponents corresponds to larger entanglement. We introduce a frequency entropy to describe the classical frequency distribution, and find that there is good correspondence between the classical frequency entro-pies and the maximum von Neumann entropies.
description: 9 pages, 2 tables, 17 figures
Pulsation and evolutionary masses of classical Cepheids. I. Milky Way variables
Creators: name: Caputo, F.
name: Bono, G.
name: Fiorentino, G.
name: Marconi, M.
name: Musella, I.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate a selected sample of Galactic classical Cepheids with available distance and reddening estimates in the framework of the theoretical scenario provided by pulsation models, computed with metal abundance Z=0.02, helium content in the range of Y=0.25 to 0.31, and various choices of the stellar mass and luminosity. After transforming the bolometric light curve of the fundamental models into BVRIJK magnitudes, we derived analytical relations connecting the pulsation period with the stellar mass, the mean (intensity-averaged) absolute magnitude, and the color of the pulsators. These relations are used together with the Cepheid observed absolute magnitudes in order to determine the "pulsation" mass -M_p- of each individual variable. The comparison with the "evolutionary" masses -M_(e,can)- given by canonical (no convective core overshooting, no mass-loss) models of central He-burning stellar structures reveals that the M_p/M_(e,can) ratio is correlated with the Cepheid period, ranging from about 0.8 at logP=0.5 to about 1 at logP=1.5. We discuss the effects of different input physics and/or assumptions on the evolutionary computations, as well as of uncertainties in the adopted Cepheid metal content, distance, and reddening. Eventually, we find that the pulsational results can be interpreted in terms of mass-loss during or before the Cepheid phase, whose amount increases as the Cepheid original mass decreases. It vanishes around 13M_(sun) and increases up to about 20% at 4M_(sun).
description: accepted for publication in ApJ