cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pulsed precessional motion on the 'back of an envelope'
Creators: name: Buess, Matthias
name: Acremann, Y.
name: Kashuba, A.
name: Back, Christian
name: Pescia, D.
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: 530 Physik

description: In a recent paper (Acremann et al 2000 Science 290 492) the precessional trajectory of the magnetization vector was imaged with spatial resolution as a function of the time elapsed after a magnetic field pulse was applied. The most surprising observations—the reversal of the magnetic excitation upon reflection from the boundary and the spatial non-uniformities of the precessional mode—have remained unaccounted for so far. Here we present a 'back of the envelope' model of the precessional motion that is analytical, free of adjustable parameters, and that reproduces all the essential experimental features, including the behaviour of the dynamical magnetization at boundaries.
On the relationship of shock waves to flares and coronal mass ejections
Creators: name: Nindos, A.
name: Alissandrakis, C. E.
name: Hillaris, A.
name: Preka-Papadema, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: Metric type II bursts are the most direct diagnostic of shock waves in the solar corona. Aims: There are two main competing views about the origin of coronal shocks: that they originate in either blast waves ignited by the pressure pulse of a flare or piston-driven shocks due to coronal mass ejections (CMEs). We studied three well-observed type II bursts in an attempt to place tighter constraints on their origins. Methods: The type II bursts were observed by the ARTEMIS radio spectrograph and imaged by the Nançay Radioheliograph (NRH) at least at two frequencies. To take advantage of projection effects, we selected events that occurred away from disk center. Results: In all events, both flares and CMEs were observed. In the first event, the speed of the shock was about 4200 km/s, while the speed of the CME was about 850 km/s. This discrepancy ruled out the CME as the primary shock driver. The CME may have played a role in the ignition of another shock that occurred just after the high speed one. A CME driver was excluded from the second event as well because the CMEs that appeared in the coronagraph data were not synchronized with the type II burst. In the third event, the kinematics of the CME which was determined by combining EUV and white light data was broadly consistent with the kinematics of the type II burst, and, therefore, the shock was probably CME-driven. Conclusions: Our study demonstrates the diversity of conditions that may lead to the generation of coronal shocks.
description: 13 pages, 14 figures. "Astronomy and Astrophysics", in press
Graph Zeta Function and Gauge Theories
Creators: name: He, Yang-Hui
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Along the recently trodden path of studying certain number theoretic properties of gauge theories, especially supersymmetric theories whose vacuum manifolds are non-trivial, we investigate Ihara's Graph Zeta Function for large classes of quiver theories and periodic tilings by bi-partite graphs. In particular, we examine issues such as the spectra of the adjacency and whether the gauge theory satisfies the strong and weak versions of the graph theoretical analogue of the Riemann Hypothesis.
description: 35 pages, 7 Figures
Interactions between sub-10 nm iron and cerium oxide nanoparticles and 3T3 fibroblasts : the role of the coating and aggregation state
Creators: name: Safi, M.
name: Sarrouj, H.
name: Sandre, O.
name: Mignet, N.
name: Berret, J. -F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent nanotoxicity studies revealed that the physico-chemical characteristics of engineered nanomaterials play an important role in the interactions with living cells. Here, we report on the toxicity and uptake of the cerium and iron oxide sub-10 nm nanoparticles by NIH/3T3 mouse fibroblasts. Coating strategies include low-molecular weight ligands (citric acid) and polymers (poly(acrylic acid), MW = 2000 g mol-1). Electrostatically adsorbed on the surfaces, the organic moieties provide a negatively charged coating in physiological conditions. We find that most particles were biocompatible, as exposed cells remained 100% viable relative to controls. Only the bare and the citrate-coated nanoceria exhibit a slight decrease of the mitochondrial activity for cerium concentrations above 5 mM (equivalent to 0.8 g L-1). We also observe that the citrate-coated particles are internalized by the cells in large amounts, typically 250 pg per cell after a 24 h incubation for iron oxide. In contrast, the polymer-coated particles are taken up at much lower rates (< 30 pg per cell). The strong uptake shown by the citrate-coated particles is related to the destabilization of the dispersions in the cell culture medium and their sedimentation down to the cell membranes. In conclusion, we show that the uptake of nanomaterials by living cells depends on the coating of the particles and on its ability to preserve the colloidal nature of the dispersions.
description: 9 figures, 2 tables
Trabajo y la libertad de prensa son claves del futuro
Creators: name: Suing, Abel
Publisher: name: Zenodo
Year: 2023
Subjects: comunicación
Libertad
Expresión
Ecuador
Trabajo
Prensa

description: Publicación en la sección de opinión del diario digital hora 32 https://hora32.com.ec/ que se edita en Loja (Ecuador)
title: Safe motherhood: the making of a global health initiative
Creators: name: Storeng, KT
Publisher: name: London School of Hygiene & Tropical Medicine
Year: 2010

description: Launched in 1987, the Safe Motherhood Initiative has brought together UN agencies, donors, NGOs and academics to galvanise a political, financial and public health response to women’s pregnancy-related death and ill health in low income countries. This thesis presents an historical ethnography of the ‘making’ of this policy community over the past twenty years, as one of many so-called global health initiatives that populate the global health field. Compared with its competitors, the Safe Motherhood Initiative is often depicted as weak and in need of urgent revival. Drawing on in-depth interviews with over seventy actors within the field, participant observation and document review, I explore how safe motherhood practitioners have come to understand the problems that are credited for the field’s stymied status, and how their ‘diagnoses’ and situational analyses have informed their subsequent practices.
My findings demonstrate that the Initiative has continually had to reposition itself in response to broader ideological, institutional and epistemological struggles. An impulse for self-preservation within a competitive global health field favouring disease-specific approaches has been in tension with safe motherhood practitioners’ fundamental conviction that comprehensive, socially-based policy change is needed to reduce maternal mortality. In order to pursue their common policy objectives and to secure their survival as an expert
group, safe motherhood practitioners have sought to enhance the credibility of their policy proposals, establish new institutions and funding mechanisms, elaborate advocacy campaigns and pursue more sophisticated research to demarcate their practices as scientific, rather than ideologically driven. However, the benefits of such ‘self-management’ practices remain to be established. In conclusion, I challenge the widespread, if implicit, assumption that the success of a single advocacy issue, as measured through the rise of a global health initiative
and growing political commitment to the specific issue, will necessarily lead to health improvement.
Okanagan Syilx historical and contemporary salmon distribution : underpinning social and governance structures
Creators: name: Good Water, Dallas
Publisher: name: University of British Columbia
Year: 2018

description: The Okanagan Syilx people reside on both sides of the Canada-U.S. border. The study of Okanagan Syilx salmon distribution practices underpinning social and governance structures is the focus of this research. The purpose is to examine gaps in contemporary management of salmon resources. I argue that historical Okanagan Syilx salmon distribution was reinforced by a complexity of multifaceted social and governance mechanics that provided equity and land sustainability for community, vital to contemporary Syilx management access and distribution. My research questions ask, first: what are the social and governance structures that underpinned and supported Syilx historical resource management and distribution? second: what were the changes that impacted Syilx historic access activities and how did they evolve into modern day governance reservation politics that resulted in governance law and historic tenets now missing? and third, how can understanding both historical and contemporary Syilx distribution methods facilitate and improve contemporary management of Syilx salmon distribution practices? The literature reviewed includes historical, ethnographic, ethnohistorical archival sources as well as contemporary research. A mixed-methods approach incorporates the literature search which focused on the first two research questions. The Enowkinwixw Process, a traditional Syilx analysis procedure, was used as an Indigenous research method to address historical social and governance structures and activities to inform present day management practices. I apply an Okanagan Syilx Nested System (parts-to-whole) analysis lens and the Enowkinwixw Four Oppositional Dynamics (of a living system) to examine and privilege historical salmon distribution practices acknowledging earlier social and governance structure. Research findings confirmed that the Okanagan Syilx historical practice of salmon distribution to external neighbouring tribes and internally in the band communities, although different from each other, were focused on equitable procedures and sustainability. Findings related to Syilx contemporary salmon distribution, although intended to be fair, were not and require re-visiting and re-organizing by the Syilx people. Research concludes that historical Syilx salmon distribution was reinforced by ceremonial protocols for community and inter-nation sharing to ensure health and wellbeing for the land and the people. Research also concludes that historical practices will strengthen and inform contemporary social cohesion and sustainable governance mechanics.
Herschel PACS and SPIRE imaging of CW Leo
Creators: name: Ladjal, D.
name: Barlow, M. J.
name: Groenewegen, M. A. T.
name: Ueta, T.
name: Blommaert, J. A. D. L.
name: Cohen, M.
name: Decin, L.
name: De Meester, W.
name: Exter, K.
name: Gear, W. K.
name: Gomez, H. L.
name: Hargrave, P. C.
name: Huygen, R.
name: Ivison, R. J.
name: Jean, C.
name: Kerschbaum, F.
name: Leeks, S. J.
name: Lim, T. L.
name: Olofsson, G.
name: Polehampton, E.
name: Posch, T.
name: Regibo, S.
name: Royer, P.
name: Sibthorpe, B.
name: Swinyard, B. M.
name: Vandenbussche, B.
name: Waelkens, C.
name: Wesson, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Herschel PACS and SPIRE images have been obtained over a 30'x30' area around the well-known carbon star CW Leo (IRC +10 216). An extended structure is found in an incomplete arc of ~22' diameter, which is cospatial with the termination shock due to interaction with the interstellar medium (ISM) as defined by Sahai & Chronopoulos from ultraviolet GALEX images. Fluxes are derived in the 70, 160, 250, 350, and 550 um bands in the region where the interaction with the ISM takes place, and this can be fitted with a modified black body with a temperature of 25+-3 K. Using the published proper motion and radial velocity for the star, we derive a heliocentric space motion of 25.1 km/s. Using the PACS and SPIRE data and the analytical formula of the bow shock structure, we infer a de-projected standoff distance of the bow shock of R0 = (8.0+-0.3)x10^17 cm. We also derive a relative velocity of the star with respect to the ISM of (106.6+-8.7)/sqrt(n_ISM) km/s, where n_ISM is the number density of the local ISM.
description: Letter accepted for the Herschel A&A special issue
Debris discs in binaries: a numerical study
Creators: name: Thebault, Philippe
name: Marzari, Francesco
name: Augereau, Jean-Charles
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Debris disc analysis and modelling provide crucial information about the structure and the processes at play in extrasolar planetary systems. In binary systems, this issue is more complex because the disc should in addition respond to the companion star's perturbations. We explore the dynamical evolution of a collisionally active debris disc for different initial parent body populations, diverse binary configurations and optical depths. We focus on the radial extent and size distribution of the disc at a stationary state. We numerically follow the evolution of $10^{5}$ massless small grains, initially produced from a circumprimary disc of parent bodies following a size distribution in $dN \propto s^{-3.5}$ds . Grains are submitted to both stars' gravity as well as radiation pressure. In addition, particles are assigned an empirically derived collisional lifetime. For all the binary configurations the disc extends far beyond the critical semimajor axis $a_crit$ for orbital stability. This is due to the steady production of small grains, placed on eccentric orbits reaching beyond $a_crit$ by radiation pressure. The amount of matter beyond acrit depends on the balance between collisional production and dynamical removal rates: it increases for more massive discs as well as for eccentric binaries. Another important effect is that, in the dynamically stable region, the disc is depleted from its smallest grains. Both results could lead to observable signatures. We have shown that a companion star can never fully truncate a collisionally active disc. For eccentric companions, grains in the unstable regions can significantly contribute to the thermal emission in the mid-IR. Discs with sharp outer edges, especially bright ones such as HR4796A, are probably shaped by other mechanisms.
description: accepted for publication in A&A
A new recursion operator for the Viallet equation
Creators: name: Mikhailov, Alexander V.
name: Wang, Jing Ping
Publisher: name: arXiv
Year: 2011
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We present a new recursion and Hamiltonian operators for the Viallet equation. This new recursion operator and the recursion operator found in [Theoretical and Mathematical Physics, 167:421--443 (2011), arXiv:1004.5346] satisfy the elliptic curve equation associated with the Viallet equation.
A Multi-color Optical Survey of the Orion Nebula Cluster. II. the H-R diagram
Creators: name: Da Rio, Nicola
name: Robberto, Massimo
name: Soderblom, David R.
name: Panagia, Nino
name: Hillenbrand, Lynne A.
name: Palla, Francesco
name: Stassun, Keivan G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a new analysis of the stellar population of the Orion Nebula Cluster (ONC) based on multi-band optical photometry and spectroscopy. We study the color-color diagrams in BVI, plus a narrow-band filter centered at 6200A, finding evidences that intrinsic color scales valid for main-sequence dwarfs are incompatible with the ONC, while a better agreement is found employing synthetic intrinsic colors obtained constraining the typical lower surface gravity of young stars. We refine these model colors even further, empirically, by comparison with a sample of ONC stars with no accretion and no extinction. We consider the stars with known spectral types from the literature, and add 65 newly classified stars from slit spectroscopy and 182 M-type from narrow-band photometry; in this way we isolate a sample of about 1000 stars with known spectral type. We introduce a new method to self-consistently derive reddening and accretion excess from the location of each star in the BVI color-color diagram. This enables us to accurately determine the extinction of the ONC members. We adopt a lower distance for the ONC than previously assumed, based on recent parallax measurements. With a careful choice also of the spectral type-temperature transformation, we produce the new H-R diagram of the ONC population, more populated than previous works. With respect to previous works, we find higher luminosity for late-type stars and a lower luminosity for early types. We determine the age distribution of the population, peaking at 2-3 Myr, a higher age than previously estimated. We study the distribution of the members in the mass-age plane, and find that taking into account selection effects due to incompleteness removes an apparent correlation between mass and age. We derive the IMF for low- and intermediate-mass members of the ONC, which turns out to be model-dependent, and shows a turn-over at ~<0.2Msun.
description: 24 pages, 23 Figures, accepted for publication in the Astrophysical Journal Supplement Series
Circular photogalvanic effect at inter-band excitation in semiconductor quantum wells
Creators: name: Bel'kov, V.
name: Ganichev, Sergey
name: Schneider, Petra
name: Back, Christian
name: Oestreich, M.
name: Rudolf, J.
name: Hägele, D.
name: Golub, L.
name: Wegscheider, Werner
name: Prettl, Wilhelm
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: A. Quantum wells; D. Spin-orbit effects
subject: 530 Physik

description: We observed a circular photogalvanic effect (CPGE) in GaAs quantum wells at inter-band excitation. The spectral dependence of the CPGE is measured together with that of the polarization degree of the time-resolved photoluminescence. A theoretical model takes into account spin splitting of conduction and valence bands.
Academic language in early childhood : what we can learn from Deaf parents' academic ASL use with their young Deaf children across home settings
Creators: name: Finley, Alayna
Publisher: name: University of British Columbia
Year: 2018

description: Children are first socialized in the language of school before even setting foot in a school. This socialization happens at home, with parents acting as a child’s first and most crucial language model. What does this mean for very young deaf children who have varied access to language in their home environment? Parental language competency, motivation, and access to resources available will shape the quality of language access. This research study examined features of parental academic language use in deaf parent and deaf child home interactions. One family was recruited for the study and the researcher visited the family five times over a period of one week. Selected family interactions were videotaped and the parents had a discussion with the researcher based on interview questions about these taped interactions. Analyses focused on parental language complexity (academic language, vocabulary, sentence types, American Sign Language [ASL] to English linking strategies, etc.) in interactions with their deaf children in their home setting. Strong evidence of parental use of extended discourse and academic language with young deaf children was found, particularly at the dinner table. Academic language modelling and higher-level facilitative language techniques by a more knowledgeable other can perhaps be taught within the context of early intervention, preparing deaf children for the world of language learning at school.
Color Decoherence in In-Medium QCD Cascades
Creators: name: Leonidov, A.
name: Nechitailo, V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The talk, based on \cite{LN10}, analyzes the consequences of the assumption that the effects of quantum coherence and the resulting angular ordering in QCD cascades are disrupted within the hot fireball created in ultrarelativistic heavy ion collisions.
description: Presented at Hard Probes 2010, Eilat, Israel
Additional file 1 of Online medical education using a Facebook peer-to-peer learning platform during the COVID-19 pandemic: a qualitative study exploring learner and tutor acceptability of Facebook as a learning platform
Creators: name: Chambers, Joshua
name: Mistry, Khaylen
name: Spink, Joel
name: Tsigarides, Jordan
name: Bryant, Pauline
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Plant Biology
subject: FOS: Biological sciences

description: Additional file 1: Appendix 1. Online Pre-questionnaire. Appendix 2. Semi-structured questions for learners.
Additional file 2 of Online medical education using a Facebook peer-to-peer learning platform during the COVID-19 pandemic: a qualitative study exploring learner and tutor acceptability of Facebook as a learning platform
Creators: name: Chambers, Joshua
name: Mistry, Khaylen
name: Spink, Joel
name: Tsigarides, Jordan
name: Bryant, Pauline
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Plant Biology
subject: FOS: Biological sciences

description: Additional file 2. Raw Data.
title: Oberst Hugo Hungerbühler (6. Juli 1846 - 24. Juni 1916)
title: Erinnerung an die Trauerfeier vom 28 Juni 1916 in der St. Leonhardskirche in St. Gallen
titleType: Subtitle
Creators: name: Dierauer, Johannes
name: Heim, Wilhelm
name: Haeni, Joh.
Publisher: name: Buchdruckerei Zollikofer & Cie.
Year: 1916
Subjects: subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Hungerbühler, Hugo
subject: Sankt Gallen

description: Lebensbild, Ansprache, Nachruf
Magnetization profile at the Fe/GaAs(001)-4x6 interface
Creators: name: Giovanelli, Luca
name: Tian, C.
name: Gastelois, P.
name: Panaccione, G.
name: Fabrizioli, M.
name: Hochstrasser, M.
name: Galaktionov, M.
name: Back, Christian
name: Rossi, G.
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: Fe; Co; GaAs; X-ray magnetic circular dichroism; Spin injection
subject: 530 Physik

description: The magnetization of a thin Fe film epitaxially grown on GaAs(0 0 1)-4×6 was studied at different depths from the metal/semiconductor interface using a single layer of Fe0.5Co0.5 as a marker layer through a double-wedge Fe film. By measuring the X-ray magnetic circular dichroism spectroscopy at the L2,3 of Co, the magnetic response of the film could be sensed at different distances from the interface. Data show a reduction of the magnetization at the interface though the existence of a magnetically “dead” layer is completely ruled out. Moreover, the magnetization was found to be reduced at the Fe film surface.
Ultracold atom-dimer long-range interactions beyond the $1/R^{n}$ expansion
Creators: name: Lepers, Maxence
name: Dulieu, Olivier
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate theoretically the combination of first-order quadrupole-quadrupole and second-order dipole-dipole effects on the long-range electrostatic interactions between a ground-state homonuclear alkali-metal dimer and an excited alkali-metal atom. As the electrostatic energy is comparable to the dimer rotational structure, we develop a general description of the long-range interactions which allows for couplings between the dimer rotational levels. The resulting adiabatic potential energy curves, which exhibit avoided crossings, cannot be expanded on the usual $1/R^{n}$ series. We study in details the breakdown of this approximation in the particular case Cs$_{2}+$Cs. Our results are found promising in the prospect of accomplishing the photoassociation of ultracold trimers.
description: Submitted to EPJD, special issue "Cold Quantum Matter - Achievements and Prospects"
Physical State of the Deep Interior of the CoRoT-7b Exoplanet
Creators: name: Wagner, F. W.
name: Sohl, F.
name: Rückriemen, T.
name: Rauer, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The present study takes the CoRoT-7b exoplanet as an analogue for massive terrestrial planets to investigate conditions, under which intrinsic magnetic fields could be sustained in liquid cores. We examine the effect of depth-dependent transport parameters (e.g., activation volume of mantle rock) on a planet's thermal structure and the related heat flux across the core mantle boundary. For terrestrial planets more massive than the Earth, our calculations suggest that a substantial part of the lowermost mantle is in a sluggish convective regime, primarily due to pressure effects on viscosity. Hence, we find substantially higher core temperatures than previously reported from parameterized convection models. We also discuss the effect of melting point depression in the presence of impurities (e.g., sulfur) in iron-rich cores and compare corresponding melting relations to the calculated thermal structure. Since impurity effects become less important at the elevated pressure and temperature conditions prevalent in the deep interior of CoRoT-7b, iron-rich cores are likely solid, implying that a self-sustained magnetic field would be absent.
description: 4 pages, 3 figures. IAU 276 Proceedings
Additional file 1 of Clinical significance of serum-derived exosomal PD-L1 expression in patients with advanced pancreatic cancer
Creators: name: Park, Se Jun
name: Park, Ju Yeon
name: Shin, Kabsoo
name: Hong, Tae Ho
name: Lee, MyungAh
name: Kim, Younghoon
name: Kim, In-Ho
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy

description: Supplementary Material 1
Fisher's zeros as boundary of RG flows in complex coupling space
Creators: name: Bazavov, A.
name: Denbleyker, A.
name: Du, Daping
name: Liu, Yuzhi
name: Meurice, Y.
name: Zou, Haiyuan
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the possibility of extending the RG flows to complex coupling spaces. We argue that the Fisher's zeros are located at the boundary of the complex basin of attraction of IR fixed points. We support this picture with numerical calculations at finite volume for2D O(N) models in the large-N limit and the hierarchical Ising model using the two-lattice matching method. We present numerical evidence supporting the idea that, as the volume increases, the Fisher's zeros of 4-dimensional pure gauge SU(2) lattice gauge theory with a Wilson action, stabilize at a distance larger than 0.1 from the real axis in the complex beta=4/g^2 plane. We show that when a positive adjoint term is added, the zeros get closer to the real axis. We compare the situation with the U(1) case. We discuss the implications of this new framework for proofs of confinement and searches for nontrivial IR fixed points in models beyond the standard model.
description: Proceedings of Lattice 2010, POS 259
Spin Motion of Electrons during Reflection from a Ferromagnetic Surface
Creators: name: Weber, Wolfgang
name: Riesen, S.
name: Back, Christian
name: Shorikov, A.
name: Anisimov, V.
name: Siegmann, H.
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: 530 Physik

description: If electrons are reflected from a ferromagnet, the spin moves depending on the magnetization vector of the ferromagnetic surface. The spin motion, consisting of a precession around the magnetization direction and a rotation into it, is measured and explained in terms of the electronic band structure of the ferromagnet. If applications within a solid-state device are considered, sizeable transverse torques on the magnetization due to the spin precession can be expected.
Additional file 1 of Identifying dementia using medical data linkage in a longitudinal cohort study: Lothian Birth Cohort 1936
Creators: name: Mullin, Donncha S.
name: Stirland, Lucy E.
name: Buchanan, Emily
name: Convery, Catherine-Anne
name: Cox, Simon R.
name: Deary, Ian J.
name: Giuntoli, Cinzia
name: Greer, Holly
name: Page, Danielle
name: Robertson, Elizabeth
name: Shenkin, Susan D.
name: Szalek, Anna
name: Taylor, Adele
name: Weatherdon, Georgina
name: Wilkinson, Tim
name: Russ, Tom C.
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1. Dementia ascertainment protocol - Lothian Birth Cohort 1936 Study.
Effect of pitchfork bifurcations on the spectral statistics of Hamiltonian systems
Creators: name: Gutiérrez, Martha
name: Richter, Klaus
name: Sugita, Ayumu
name: Brack, Matthias
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 530 Physik
subject: 03.65.Sq
subject: 05.45.Mt

description: We present a quantitative semiclassical treatment of the effects of bifurcations on the spectral rigidity and the spectral form factor of a Hamiltonian quantum system defined by two coupled quartic oscillators, which on the classical level exhibits mixed phase space dynamics. We show that the signature of a pitchfork bifurcation is two-fold: beside the known effect of an enhanced periodic orbit contribution due to its peculiar hbar-dependence at the bifurcation, we demonstrate that the orbit pair born at the bifurcation gives rise to distinct deviations from universality slightly above the bifurcation. This requires a semiclassical treatment beyond the so-called diagonal approximation. Our semiclassical predictions for both the coarse-grained density of states and the spectral rigidity, are in excellent agreement with corresponding quantum-mechanical results.
Computer Assisted Proof for Normally Hyperbolic Invariant Manifolds
Creators: name: Capinski, Maciej J.
name: Simo, Carles
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We present a topological proof of the existence of a normally hyperbolic invariant manifold for maps. In our approach we do not require that the map is a perturbation of some other map for which we already have an invariant manifold. But a non-rigorous, good enough, guess is necessary. The required assumptions are formulated in a way which allows for rigorous computer assisted verification. We apply our method for a driven logistic map, for which non-rigorous numerical simulation in plain double precision suggests the existence of a chaotic attractor. We prove that this numerical evidence is false and that the attractor is a normally hyperbolic invariant curve.
description: 33 pages, 16 figures
Perceptual Audio Coding: A 40-Year Historical Perspective
Creators: name: Herre, Jürgen
name: Quackenbush, Schuyler
name: Kim, Minje
name: Skoglund, Jan
Publisher: name: arXiv
Year: 2025
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In the history of audio and acoustic signal processing, perceptual audio coding has certainly excelled as a bright success story by its ubiquitous deployment in virtually all digital media devices, such as computers, tablets, mobile phones, set-top-boxes, and digital radios. From a technology perspective, perceptual audio coding has undergone tremendous development from the first very basic perceptually driven coders (including the popular mp3 format) to today's full-blown integrated coding/rendering systems. This paper provides a historical overview of this research journey by pinpointing the pivotal development steps in the evolution of perceptual audio coding. Finally, it provides thoughts about future directions in this area.
Polysaccharide/Surfactant complexes at the air-water interface - Effect of the charge density on interfacial and foaming behaviors
Creators: name: Ropers, Marie-Hélène M. H.
name: Novales, Bruno
name: Boué, François
name: Axelos, Monique A. V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The binding of a cationic surfactant (hexadecyltrimethylammonium bromide, CTAB) to a negatively charged natural polysaccharide (pectin) at air-solution interfaces, was investigated on single interfaces and in foams, versus the linear charge densities of the polysaccharide. Beside classical methods to investigate polymer/surfactant systems, we applied, for the first time concerning these systems, the analogy between the small angle neutron scattering by foams and the neutron reflectivity of films to measure in situ film thicknesses of foams. CTAB/pectin foam films are much thicker than that of the pure surfactant foam film but similar for highly and lowly charged pectin/CTAB systems despite the difference in structure of complexes at interfaces. The improvement of the foam properties of CTAB bound to pectin is shown to be directly related to the formation of pectin-CTAB complexes at the air-water interface. However, in opposition to surface activity, there is no specific behavior for the highly charged pectin: foam properties depend mainly upon the bulk charge concentration, while the interfacial behavior is mainly governed by the charge density of pectin. For the highly charged pectin, specific cooperative effects between neighboring charged sites along the chain are thought to be involved in the higher surface activity of pectin/CTAB complexes. A more general behavior can be obtained at lower charge density either by using a lowly charged pectin or by neutralizing the highly charged pectin in decreasing pH. .
title: Investigation of cemented tailings backfill and wellbore stability for narrow vein mining by drilling
Creators: name: Someehneshin, Javad
Publisher: name: Memorial University of Newfoundland
Year: 2020

description: In this thesis, a comprehensive investigation of using tailings in backfilling material and the percentage of Portland cement and binder composition (a combination of Portland cement and fly ash) with the proportion of (80:20) is studied. Curing time and curing strength of the backfilling material after 7 days, 14 days, and 28 days were the main objective of this thesis. The freestanding vertical face of the void space by inclined stope method was calculated. Specimens were made with Portland cement as the first binder, which was composed of 6%, 8%, and 10% of the solid content of the mixture and 20% water content of the backfilling mixture. The Curing time and curing strength of the specimens in this first binder were measured by Geo-mechanical Loading Frame in Drilling Technology Laboratory (DTL). The second series of the specimens were made with binder composed of regular Portland cement 80% type GU and fly ash 20% class C with 6%, 8%, and 10% of the solid content of the mixture and 20% water content of the backfilling mixture. Then the curing time and curing strength of the specimens were measured. Finally, the results were compared and the effect of binder dosage on Unconfined Compressive Strength (UCS), the effect of binder composition on UCS, the effect of curing time on UCS, and the stiffness of backfilling materials for both binders were presented. In addition, an analytical study and Discrete Element Method (DEM) simulation were conducted to evaluate the wellbore stability of steeply mining using various wellbore failure criteria. Mining site data of surface and subsurface in-situ stress and rock mechanics properties was collected to support the study. The dimensions of the studied wellbore were 100m maximum depth, 1.3m maximum diameter, and 45 degrees inclination. The wellbore rock failure was analyzed, and the critical wellbore pressure after drilling in four essential azimuths (i.e. 0˚, 90˚, 180˚, and 270˚) using pure water was calculated. The results of the individual and the analytical-DEM coupled study demonstrated that the wellbore stability. The critical wellbore pressure is negative all along the wellbore; also, all applied stresses around the wellbore are between minimum wellbore pressure and maximum wellbore pressure, which indicates the stability of the well.
Additional file 2 of Identifying dementia using medical data linkage in a longitudinal cohort study: Lothian Birth Cohort 1936
Creators: name: Mullin, Donncha S.
name: Stirland, Lucy E.
name: Buchanan, Emily
name: Convery, Catherine-Anne
name: Cox, Simon R.
name: Deary, Ian J.
name: Giuntoli, Cinzia
name: Greer, Holly
name: Page, Danielle
name: Robertson, Elizabeth
name: Shenkin, Susan D.
name: Szalek, Anna
name: Taylor, Adele
name: Weatherdon, Georgina
name: Wilkinson, Tim
name: Russ, Tom C.
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 2. Approximate number of person-hours required for each ascertainment phase.
A general method for the unbiased improvement of solution NMR structures by the use of related X-ray data, the AUREMOL-ISIC algorithm
Creators: name: Brunner, Konrad
name: Gronwald, Wolfram
name: Trenner, Jochen
name: Neidig, Klaus-Peter
name: Kalbitzer, Hans-Robert
Publisher: name: Universität Regensburg
Year: 2006
Subjects: subject: 530 Physik

description: Background Rapid and accurate three-dimensional structure determination of biological macromolecules is mandatory to keep up with the vast progress made in the identification of primary sequence information. During the last few years the amount of data deposited in the protein data bank has substantially increased providing additional information for novel structure determination projects. The key question is how to combine the available database information with the experimental data of the current project ensuring that only relevant information is used and a correct structural bias is produced. For this purpose a novel fully automated algorithm based on Bayesian reasoning has been developed. It allows the combination of structural information from different sources in a consistent way to obtain high quality structures with a limited set of experimental data. The new ISIC (Intelligent Structural Information Combination) algorithm is part of the larger AUREMOL software package. Results Our new approach was successfully tested on the improvement of the solution NMR structures of the Ras-binding domain of Byr2 from Schizosaccharomyces pombe, the Ras-binding domain of RalGDS from human calculated from a limited set of NMR data, and the immunoglobulin binding domain from protein G from Streptococcus by their corresponding X-ray structures. In all test cases clearly improved structures were obtained. The largest danger in using data from other sources is a possible bias towards the added structure. In the worst case instead of a refined target structure the structure from the additional source is essentially reproduced. We could clearly show that the ISIC algorithm treats these difficulties properly. Conclusion In summary, we present a novel fully automated method to combine strongly coupled knowledge from different sources. The combination with validation tools such as the calculation of NMR R-factors strengthens the impact of the method considerably since the improvement of the structures can be assessed quantitatively. The ISIC method can be applied to a large number of similar problems where the quality of the obtained three-dimensional structures is limited by the available experimental data like the improvement of large NMR structures calculated from sparse experimental data or the refinement of low resolution X-ray structures. Also structures may be refined using other available structural information such as homology models.
Introduction to Categories and Categorical Logic
Creators: name: Abramsky, Samson
name: Tzevelekos, Nikos
Publisher: name: arXiv
Year: 2011
Subjects: subject: Category Theory (math.CT)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The aim of these notes is to provide a succinct, accessible introduction to some of the basic ideas of category theory and categorical logic. The notes are based on a lecture course given at Oxford over the past few years. They contain numerous exercises, and hopefully will prove useful for self-study by those seeking a first introduction to the subject, with fairly minimal prerequisites. The coverage is by no means comprehensive, but should provide a good basis for further study; a guide to further reading is included. The main prerequisite is a basic familiarity with the elements of discrete mathematics: sets, relations and functions. An Appendix contains a summary of what we will need, and it may be useful to review this first. In addition, some prior exposure to abstract algebra - vector spaces and linear maps, or groups and group homomorphisms - would be helpful.
description: 96 pages
Microwave enhanced advanced oxidation process (MW/H₂O₂-AOP) treatment of sewage sludge at different pH conditions
Creators: name: Tunilė, Indrė
Publisher: name: University of British Columbia
Year: 2018

description: The primary focus of this study was to investigate the effectiveness of a microwave-enhanced advanced oxidation process (MW/H₂O₂-AOP) for treating sludge from a membrane-enhanced biological phosphorus removal process in neutral, acidic (pH 4) and alkaline (pH 9) conditions. Two different MW systems were utilized; the bench-scale (2450 MHz) and pilot-scale (915 MHz) systems that operate in batch-mode and continuous-flow mode, respectively. The effects of pH on solids disintegration, nutrient release and the physical properties of sludge were examined. The MW/H₂O₂-AOP treatment was very effective; the total suspended solids reduction and chemical oxygen demand solubilization was better for alkaline sets rather than acidic. However, acidic conditions were superior in the release of orthophosphate, particle size distribution, dewatering properties and settling. In the treatment of acidified dairy manure, with the 915 MHz pilot-scale system at temperatures of 90 and 110°C and with a hydrogen peroxide dosage of 0.6% (v/v) per percent of total solids, the MW/H₂O₂AOP yielded a clear supernatant, rich in the nutrients required for struvite (MgNH₄PO₄·6H₂O₂) crystal formation. A total of fifteen salt water experiments were conducted with a salt concentration ranging from 10 to 120 g/L at three different flow rates (6, 7.5 and 9 L/min). The dominant heating mechanism was dipolar polarization and ionic conduction at a high flow rate and high salt concentration, respectively. High concentrations of ions suppressed the dielectric polarization, resulting in lower temperatures. Energy consumption was similar among the sets.
Absorption and emission spectroscopic characterisation of blue-light receptor Slr1694 from Synechocystis sp. PCC6803
Creators: name: Zirak, Peyman
name: Penzkofer, Alfons
name: Lehmpfuhl, C.
name: Mathes, T.
name: Hegemann, P.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: BLUF domain; Slr1694 protein from Synechocystis sp. PCC6803; Blue-light photoreceptor; Absorption spectroscopy; Fluorescence spectroscopy; Photo-cycle; Photo-reduction; Flavoprotein; Flavins; FAD; FMN; Riboflavin
subject: 530 Physik

description: The BLUF protein Slr1694 from the cyanobacterium Synechocystis sp. PCC6803 is characterized by absorption and emission spectroscopy. Slr1694 expressed from E. coli which non-covalently binds FAD, FMN, and riboflavin (called Slr1694I), and reconstituted Slr1694 which dominantly contains FAD (called Slr1694II) are investigated. The receptor conformation of Slr1694 (dark adapted form Slr1694r) is transformed to the putative signalling state (light adapted form Slr1694s) with red-shifted absorption and decreased fluorescence efficiency by blue-light excitation. In the dark at 22 °C, the signalling state recovers back to the initial receptor state with a time constants of about 14.2 s for Slr1694I and 17 s for Slr1694II. Quantum yields of signalling state formation of approximately 0.63 ± 0.07 for both Slr1694I and Slr1694II were determined by transient transmission measurements and intensity dependent steady-state transmission measurements. Extended blue-light excitation causes some bound flavin conversion to the hydroquinone form and some photo-degradation, both with low quantum efficiency. The flavin-hydroquinone re-oxidizes slowly back (time constant 5–9 min) to the initial flavoquinone form in the dark. A photo-cycle dynamics scheme is presented.
Proceedings Twelfth Annual Workshop on Descriptional Complexity of Formal Systems
Creators: name: McQuillan, Ian
name: Pighizzini, Giovanni
Publisher: name: arXiv
Year: 2010
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Computational Complexity (cs.CC)
subject: Discrete Mathematics (cs.DM)
subject: Information Theory (cs.IT)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.1.1;F.1.2;F.4.1;F.4.2;F.4.3

description: The 12th annual workshop, Descriptional Complexity of Formal Systems 2010, is taking place in Saskatoon, Canada, on August 8-10, 2010. It is jointly organized by the IFIP Working Group 1.2 on Descriptional Complexity and by the Department of Computer Science at the University of Saskatchewan. This volume contains the papers of the invited lectures and the accepted contributions.
description: These proceedings are dedicated to Chandra M. R. Kintala, who passed away on November 05, 2009, at the age of 61. We, the DCFS community, remember him as Chair of the IFIP Working Group 1.2 on Descriptional Complexity, as a co-initiator of the area of descriptional complexity with limited resources and as a co-founder of the workshops DCAGRS and DCFS. He was on the program committee for this DCFS2010 and did unfortunately not live to see the results of the submission and reviewing process