cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A comparative study of multiply-controlled valley asymmetry in S.E. Wyoming and S.W. Manitoba
Creators: name: Kennedy, Barbara A.
Publisher: name: University of British Columbia
Year: 2011

description: The nature of the inter-relationship of valley-side slopes and the streams at their base is regarded as being of fundamental significance in the study of landscape morphology. One aspect of this relationship, the problem of the development of valley-side asymmetry in east-trending valleys under the joint influence of microclimatic and stream controls, is investigated in two areas of uniform, flat-lying beds, using the approach and techniques of experimental design. Valleys in both study areas have been formed during the last 12,000 years, so that the importance of fossil slope forms is minimal. The variation in lithology between the two areas is held to be of less consequence than the difference in climatic regimes, as far as the type of asymmetry developed. The moister of the two areas, S.W. Manitoba, shows the typical, valley-wide asymmetry regarded as characteristic of non-periglaclal regions, with north-facing slopes significantly steepened by 3.1°, on average: the effects of basal steepening by meandering streams are additive with the microclimatic differences. In the drier area, S.E. Wyoming, the effects of the two controls are non-additive, and asymmetry is a purely localised development created by the over-steepening of shaded, north-facing undercut slopes. The moisture availability in this environment is probably increased by the formation of snowdrifts in the winter months. Asymmetry resulting from differences in aspect is statistically insignificant both in east-trending valleys without defined stream channels and in south-trending valleys with meandering streams. The absolute maximum angle is found to be an excellent indicator both of local changes in slope form and of the nature of the profiles as a whole. The degree of organisation of all profiles studied, in relation to the maximum angle, is high, with the exception of the south-facing slopes in those east-trending valleys in Wyoming which lack defined channels. In general, the maximum angle appears more directly related to the other geometric features of the profile than to the characteristics of soil, vegetation or nearby stream channel. A consideration of all available data on multiply-controlled asymmetry in non-periglacial areas leads to the conclusion that differences in steepness of slopes with northern and southern aspects are more likely to develop in regions of comparatively low humidity and that the valley-wide asymmetry found in Manitoba is the most common form. The strictly localised asymmetry developed in the Wyoming valleys appears to be a specialized phenomenon confined to a narrow area of semi-arid climate. It is suggested that the local conditions of moisture availability are the prime controls of multiply-controlled valley asymmetry, in that they will determine the relative importance of slope and channel processes and hence the nature of the valley-side development.
Singularly perturbed dynamics of the tippedisk
Creators: name: Sailer, Simon
Publisher: name: figshare
Year: 2021
Subjects: subject: 91304 Dynamics, Vibration and Vibration Control
subject: FOS: Mechanical engineering
subject: 10599 Mathematical Physics not elsewhere classified
subject: FOS: Mathematics
subject: 10109 Ordinary Differential Equations, Difference Equations and Dynamical Systems
subject: 10204 Dynamical Systems in Applications
subject: Mechanics

description: Abstract: The tippedisk is a mathematical-mechanical archetype for a peculiarfriction-induced instability phenomenon leading to the inversion of anunbalanced spinning disc, being reminiscent to (but different from) the wellknown inversion of the tippetop. A reduced model of the tippedisk, in theform of a three-dimensional ordinary differential equation, has been derivedrecently, followed by a preliminary local stability analysis of stationary spinningsolutions. In the current paper, a global analysis of the reduced systemis pursued using the framework of singular perturbation theory. It is shownhow the presence of friction leads to slow-fast dynamics and the creation of atwo-dimensional slow manifold. Furthermore, it is revealed that a bifurcationscenario involving a homoclinic bifurcation and a Hopf bifurcation leads to anexplanation of the inversion phenomenon. In particular, a closed-form conditionfor the critical spinning speed for the inversion phenomenon is derived.Hence, the tippedisk forms an excellent mathematical-mechanical problemfor the analysis of global bifurcations in singularly perturbed dynamics.
Caracterización de la cacota de cacao (Theobroma cacao L.) clon fear-05 para la obtención de materiales carbonosos mediante activación química para posible uso industrial
Creators: name: Güiza, Iván A.
name: Gómez-Reina, Miguel A.
name: Cuan-Mamby, Gabriela M.
name: Monsalve-Estrada, Nancy Y.
name: López-Muñoz, Luis G.
Publisher: name: Zenodo
Year: 2023
Subjects: cacota, carbón activado, clon, material volátil, variable independiente

description: Este trabajo presentó los resultados del desarrollo de la evaluación de la cacota de cacao (Theobroma cacao L.) CLON FEAR-05 buscando una alternativa  a la problemática con los residuos orgánicos, indagando algunos de los usos que pueden tener estos en el aprovechamiento para obtener carbón activado de distintos grados de adsorción para usos como: descontaminantes de aguas, recuperación de solventes, control de emisiones, decoloración de líquidos, para la obtención de materiales carbonosos mediante activación química se realizaron las pruebas en la Universidad de los Llanos, para esto se realizaron pruebas en donde se hizo la activación mediante diferentes temperaturas 600, 700 y 800 °C encontrándose en la determinación de humedad para el C1 del 2,4693%, el C2 de 2,8748% y el C3 de 2,5790%, en la prueba realizada para determinar la ceniza en cada una de las temperaturas descritas anteriormente fue C1 4,68%, C2 2,74%  y C3  6,08 % respectivamente, las pruebas sometidas a la materia prima para determinar el material volátil arrojó que para el C1  obtuvo un resultado de 62,36%, el C2 un 64,81% y  del C3 es de 78,95%; además encontrándose del material carbonoso el C1 un 30.49%, el C2 un 29.58% y el C3 obtuvo un valor más bajo de 12.39% de carbono fijo. Lo que se puede deducir al determinar las características del material precursor, permite proyectar el tipo de carbón activado a obtener teóricamente, debido a que estas características están relacionadas con la calidad y propiedades del material carbonoso por lo que se puede recomendar en el uso del producto en la absorción de químicos tales como el azul de metileno, fenol y entre otros ya anterior mencionados, dado que es el mayor uso que se les está dando con las investigaciones realizadas.
Towards Forever Access for Implanted Brain-Computer Interfaces
Creators: name: Ugur, Muhammed
name: Pothukuchi, Raghavendra Pradyumna
name: Bhattacharjee, Abhishek
Publisher: name: arXiv
Year: 2024
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: Designs for implanted brain-computer interfaces (BCIs) have increased significantly in recent years. Each device promises better clinical outcomes and quality-of-life improvements, yet due to severe and inflexible safety constraints, progress requires tight co-design from materials to circuits and all the way up the stack to applications and algorithms. This trend has become more aggressive over time, forcing clinicians and patients to rely on vendor-specific hardware and software for deployment, maintenance, upgrades, and replacement. This over-reliance is ethically problematic, especially if companies go out-of-business or business objectives diverge from clinical promises. Device heterogeneity additionally burdens clinicians and healthcare facilities, adding complexity and costs for in-clinic visits, monitoring, and continuous access.
 Reliability, interoperability, portability, and future-proofed design is needed, but this unfortunately comes at a cost. These system features sap resources that would have otherwise been allocated to reduce power/energy and improve performance. Navigating this trade-off in a systematic way is critical to providing patients with forever access to their implants and reducing burdens placed on healthcare providers and caretakers. We study the integration of on-device storage to highlight the sensitivity of this trade-off and establish other points of interest within BCI design that require careful investigation. In the process, we revisit relevant problems in computer architecture and medical devices from the current era of hardware specialization and modern neurotechnology.
New Spin(7) holonomy metrics admiting G2 holonomy reductions and M-theory/IIA dualities
Creators: name: Salur, S.
name: Santillan, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: IAs is well known, when D6 branes wrap a special lagrangian cycle on a non compact CY 3-fold in such a way that the internal string frame metric is Kahler there exists a dual description, which is given in terms of a purely geometrical eleven dimensional background with an internal metric of $G_2$ holonomy. It is also known that when D6 branes wrap a coassociative cycle of a non compact $G_2$ manifold in presence of a self-dual two form strength the internal part of the string frame metric is conformal to the $G_2$ metric and there exists a dual description, which is expressed in terms of a purely geometrical eleven dimensional background with an internal non compact metric of Spin(7) holonomy. In the present work it is shown that any $G_2$ metric participating in the first of these dualities necessarily participates in one of the second type. Additionally, several explicit Spin(7) holonomy metrics admitting a $G_2$ holonomy reduction along one isometry are constructed. These metrics can be described as $R$-fibrations over a 6-dimensional Kahler metric, thus realizing the pattern Spin(7) $\to G_2\to$ (Kahler) mentioned above. Several of these examples are further described as fibrations over the Eguchi-Hanson gravitational instanton and, to the best of our knowledge, have not been previously considered in the literature.
description: Final version, accepted in Phys.Rev.D
D2.1 - Data Models & Representations
Creators: name: Boytcheva, Svetla
name: Tarkalanov, Plamen
name: Tulechki, Nikola
name: Pavlin Gyurov
name: Rusinov, Nikola
name: Alexiev, Vladimir
name: Kotov, Martin
Publisher: name: Zenodo
Year: 2022
Subjects: food safety
big data
standards
certification

description: This document presents the updated version of the data models developed until M24 of The Food Safety Market (TheFSM) project and their machine-readable representations. In the document we briefly present data types, data sources, and data formats. Special attention is paid to the domainspecific ontologies, standard classifications, and vocabularies. The result data models are based on the desk research and analysis, based on data inventory of publicly available datasets, as well as dataset samples provided by TheFSM consortium. The detailed analysis of data requirements of all use cases and certification schemes serves as a basis for TheFSM integrated data model. Developed machine-readable data models are in compliance with the industry-accepted standards in order to ensure interoperability of theFSM platform. This document will be further updated at M36 to describe the final data model and its extensions in terms of data interoperability and coverage.
title: Wasser und die Stadt – Auswirkung der weltweiten Urbanisierung auf die nachhaltige Verfügbarkeit von Wasserressourcen
Creators: name: Hack, Jochen
Publisher: name: Trialog e.V.
Year: 2021

description: Eine ausreichende Wasserversorgung war schon immer Voraussetzung für eine wirtschaftliche Entwicklung und nachhaltige Stadtentstehung. Bereits früh in der Geschichte wurde klar, dass Städte regional und teilweise auch überregional über die physischen Stadtgrenzen hinaus Wasserressourcen beanspruchen. Dies geschieht durch die quantitative Beeinflussung des Wasserkreislaufs aufgrund von Wasserentnahme und Änderungen des natürlichen Abfluss-, Speicherungs- und Verdunstungsverhaltens, sowie durch fortschreitende Bodenversiegelung und Flussbegradigungen. Aber auch die qualitative Beeinflussung, bedingt durch häusliche und gewerbliche Emissionen stofflicher und nicht-stofflicher Art (insbesondere thermische Belastungen durch Kraftwerke), nimmt immer mehr zu. So werden die Wasserressourcen im Umkreis von Städten als Rohstoffquelle und als Senke zur Aufnahme von Schad- und Abfallstoffen in zunehmenden Maße verknappt. Zukünftig stehen große Herausforderungen bevor im Zusammenhang mit einem weiteren Bevölkerungswachstum in urbanen Räumen und der notwendigen wirtschaftlichen Entwicklung, insbesondere in Entwicklungs- und Schwellenländern. In wie weit konventionelle Lösungen diese Probleme lösen können, ist weitgehend unklar.
Lower Higgs boson mass bounds from a chirally invariant lattice Higgs-Yukawa model with overlap fermions
Creators: name: Gerhold, P.
name: Jansen, K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the coupling parameter dependence of the Higgs boson mass in a chirally invariant lattice Higgs-Yukawa model emulating the same Yukawa coupling structure as in the Higgs-fermion sector of the Standard Model. Eventually, the aim is to establish non-perturbative upper and lower Higgs boson mass bounds derived from first principles, in particular not relying on vacuum stability considerations for the latter case. Here, we present our lattice results for the lower Higgs boson mass bound at several values of the cutoff and compare them to corresponding analytical calculations based on the effective potential as obtained from lattice perturbation theory. Furthermore, we give a brief outlook towards the calculation of the upper Higgs boson mass bound.
description: 15 pages, 6 figures
Teleporting bipartite entanglement using maximally entangled mixed channels
Creators: name: Campbell, S.
name: Paternostro, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The ability to teleport entanglement through maximally entangled mixed states as defined by concurrence and linear entropy is studied. We show how the teleported entanglement depends on the quality of the quantum channel used, as defined through its entanglement and mixedness, as well as the form of the target state to be teleported. We present new results based on the fidelity of the teleported state as well as an experimental set-up that is immediately implementable with currently available technology.
description: 8 pages, 7 figures, RevTeX4, Accepted for publication in the IJQI special issue on Distributed Quantum Information Processing
Dissecting Galaxies with Quantitative Spectroscopy of the Brightest Stars in the Universe
Creators: name: Kudritzki, Rolf Peter
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Measuring distances to galaxies, determining their chemical composition, investigating the nature of their stellar populations and the absorbing properties of their interstellar medium are fundamental activities in modern extragalactic astronomy helping to understand the evolution of galaxies and the expanding universe. The optically brightest stars in the universe, blue supergiants of spectral A and B, are unique tools for these purposes. With absolute visual magnitudes up to M_V = -9.5 they are the ideal to obtain accurate quantitative information about galaxies through the powerful modern methods of quantitative stellar spectroscopy. The spectral analyis of individual blue supergiant targets provides invaluable information about chemical abundances and abundance gradients, which is more comprehensive than the one obtained from HII regions, as it includes additional atomic species, and which is also more accurate, since it avoids the systematic uncertainties inherent in the strong line studies usually applied to the HII regions of spiral galaxies beyond the Local Group. Simultaneously, the spectral analysis yields stellar parameters and interstellar extinction for each individual supergiant target, which provides an alternative very accurate way to determine extragalactic distances through a newly developed method, called the Flux-weighted Gravity - Luminosity Relationship (FGLR). With the present generation of 10m-class telescopes these spectroscopic studies can reach out to distances of 10 Mpc. The new generation of 30m-class will allow to extend this work out to 30 Mpc, a substantial volume of the local universe.
description: Karl Schwarzschild Lecture 2009. To appear in Astronomische Nachrichten
Blue book in steel; a novel
Creators: name: Kitaeff, Richard
Publisher: name: University of British Columbia
Year: 2011

description: This novel is concerned in part with the development of the associated feelings of guilt, atonement and expiation from a young man's crisis of self-betrayal to his crisis of self-sacrifice. It also affirms the absurdity of imposing a personal spiritual quest on a society promiscuously addicted to debased representational modes of expression. The action occurs during one evening in New York, with mixed chronology flashbacks that reveal the evolution of the protagonist's consciousness in the overall mosaic design of a jazz tune. Various media (prayer, psychedelic vision, popular songs, radio program, nightclub routine, etc.), images from the "carny" world, and “cut-up" style at heights of intensity all serve to externalize events of consciousness.
Effective Lagrangian and Quantum Screening in Charged Condensate
Creators: name: Gabadadze, Gregory
name: Rosen, Rachel A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A condensate of charged scalars in a neutralizing background of fermions (e.g., condensed helium-4 nuclei in an electron background in white dwarf cores) is investigated further. We discuss an effective Lagrangian approach to this system and show that the strong screening of an electric charge found previously in arXiv:0806.3692 in a mean-field approximation, is a consequence of a cancellation due to a phonon. The resulting propagators contain terms that strongly modify their infrared behavior. Furthermore, we evaluate a one-loop fermion quantum correction to the screened potential, and find that it is also suppressed by the phonon subtraction. Therefore, charged impurities (e.g., hydrogen or helium-3 nuclei) will be screened efficiently by the condensate.
description: 1+16 pages; v2: typos & minor improvements; v3: one reference and one footnote added; two comments streamlined
Polarizabilities of the nucleon and spin dependent photo-absorption
Creators: name: Schumacher, Martin
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The polarizabilities $α$ (electric), $β$ (magnetic) and $γ_π$ (backward spin) of the nucleon are investigated in terms of degrees of freedom of the nucleon using recent results for the CGLN amplitudes and resonance couplings $A_{1/2}$ and $A_{3/2}$. The photon excitation strengths of the excited states are given in terms of partial integrated photoabsorption cross sections and resonant contributions of the Gerasimov-Drell-Hearn (GDH) sum rule. As a test of the present predictions, cross section differences $(σ_{3/2}-σ_{1/2})$ of the excited states are compared with data recently measured at MAMI (Mainz) and ELSA (Bonn), In order to explain differences between proton and neutron, radiative widths of the excited states are compared with nonrelativistic and relativistic predictions based on the SU(6) harmonic oscillator (HO) quark model, A complete list of partial contributions from the s-channel and the $t$-channel are given for the polarizabilities.
Stable topological phases in a family of two-dimensional fermion models
Creators: name: Cheng, Meng
name: Sun, Kai
name: Galitski, Victor
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We show that a large class of two-dimensional spinless fermion models exhibit topological superconducting phases characterized by a non-zero Chern number. More specifically, we consider a generic one-band Hamiltonian of spinless fermions that is invariant under both time-reversal, $\mathbb{T}$, and a group of rotations and reflections, $\mathbb{G}$, which is either the dihedral point-symmetry group of an underlying lattice, $\mathbb{G}=D_n$, or the orthogonal group of rotations in continuum, $\mathbb{G}={\rm O}(2)$. Pairing symmetries are classified according to the irreducible representations of $ \mathbb{T} \otimes \mathbb{G}$. We prove a theorem that for any two-dimensional representation of this group, a time-reversal symmetry breaking paired state is energetically favorable. This implies that the ground state of any spinless fermion Hamiltonian in continuum or on a square lattice with a singly-connected Fermi surface is always a topological superconductor in the presence of attraction in at least one channel. Motivated by this discovery, we examine phase diagrams of two specific lattice models with nearest-neighbor hopping and attraction on a square lattice and a triangular lattice. In accordance with the general theorem, the former model exhibits only a topological $(p + ip)$-wave state, while the latter shows a doping-tuned quantum phase transition from such state to a non-topological, but still exotic $f$-wave superconductor.
description: 6 pages, 2 figures, new references added
In My Backyard - archive
Creators: name: GonzÃ¡Lez, Esteban
Publisher: name: Zenodo
Year: 2021

description: The project aims to understand and map the use of pesticides and fertilizers and sustainable alternative practices in the context of home farming and gardening. Simultaneously, it aims to disseminate information on the topic with the final aim of reducing the use of pesticides and fertilizers.
description: Research Object in rohub2020: https://w3id.org/ro-id/daba11a7-afa3-4fb7-8263-d08af72b1670
Transcranial Doppler Ultrasound (TCD) and Intraoperative TCD Monitoring: Perspective
Creators: name: Zeenat Qureshi Stroke Institutes
Publisher: name: Zenodo
Year: 2023

description: Today it seems prudent to reconsider how ultrasound technology can be used for providing intra-operativeneurophysiologic monitoring that will result in better patient outcomes and decreased length and cost of hospitalization.An extensive and rapidly growing literature suggests that the essential hemodynamic information provided bytranscranial Doppler (TCD) ultrasonography monitoring will provide effective neuromonitoring for improvingoutcomes after different types of cardiovascular, cardiothoracic, and some endovascular interventional or diagnosticprocedures, like cardiac catheterization or cerebral angiography. Understanding, avoiding and preventing peri- orpostoperative complications, including neurological deficits following abovementioned surgeries or endovascularintervention or diagnostic procedures represents an area of great public and economic benefit for society, especiallyconsidering the aging population. At present, experience with TCD technique includes the ability to measurecerebral blood flow velocity and identify cerebral microemboli. Continuous TCD monitoring along with systemichemodynamics will provide a better understanding of mechanisms of cerebral ischemic events that may occur duringor after surgical or endovascular procedures. Neuroprotective interventions based on multimodal neurologicalmonitoring that includes TCD modality would ideally eliminate postoperative cerebral ischemic events and improvepatient outcomes. However, widespread TCD monitoring clinical application in Operating Room or angiographicunit settings is currently hindering by the absence of specific CPT (Current Procedural Terminology) code for itsutilization. Therefore, there is a critical need for creation of new CPT code for TCD monitoring in Operating Roomor during endovascular diagnostic and therapeutic procedures that will prevent cerebral adverse events during or afterabovementioned procedures.
In My Backyard - archive
Creators: name: GonzÃ¡Lez, Esteban
Publisher: name: Zenodo
Year: 2021

description: The project aims to understand and map the use of pesticides and fertilizers and sustainable alternative practices in the context of home farming and gardening. Simultaneously, it aims to disseminate information on the topic with the final aim of reducing the use of pesticides and fertilizers.
description: Research Object in rohub2020: https://w3id.org/ro-id/2f0a05d6-b41c-431b-836d-bb3ef6271696
Lattice Boltzmann Computation of Plasma Jet Behaviors : part II Argon-Nitrogen Mixture
Creators: name: Djebeli, Rhida
name: Pateyron, Bernard
name: Elganaoui, Mohamed
name: Sammouda, Habib
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: . Plasma jets are a high temperature flows, then all physical parameters are temperature dependent. This work aims to address the issue of simulating plasma-jet from the point of view of extending the applications to simulating flows with temperature-dependent diffusion parameters (viscosity and diffusivity), focusing on the phenomena occurring in plasma-jet flow for a mixture of plasma gases, N2-Ar62.5% vol. Argon and Nitrogen are two gases of the most ones used in plasma spraying. The mixture is used when looking for some jet properties. We limit our effort to take out the dynamic and thermal characteristics of this complex flow using the lattice Boltzmann equation. An important section focuses mainly on the validation of our results with compute jet dynamics software such as GENMIX and Jets & Poudres developed in laboratory SPCTS in several updated edition. These codes established for many turbulence models (k-epsilon, k-omega, Prandtl's models...) are helpful numerical keys for understanding the physics of plasma jets and plasma spraying.
Prominence seismology using small amplitude oscillations
Creators: name: Oliver, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Quiescent prominences are thin slabs of cold, dense plasma embedded in the much hotter and rarer solar corona. Although their global shape is rather irregular, they are often characterised by an internal structure consisting of a large number of thin, parallel threads piled together. Prominences often display periodic disturbances mostly observed in the Doppler displacement of spectral lines and with an amplitude typically of the order of or smaller than 2--3 km s$^{-1}$, a value which seems to be much smaller than the characteristic speeds of the prominence plasma (namely the Alfvén and sound velocities). Two particular features of these small amplitude prominence oscillations is that they seem to damp in a few periods and that they seem not to affect the whole prominence structure. In addition, in high spatial resolution observations, in which threads can be discerned, small amplitude oscillations appear to be clearly associated to these fine structure constituents. Prominence seismology tries to bring together the results from these observations (e.g. periods, wavelengths, damping times) and their theoretical modeling (by means of the magnetohydrodynamic theory) to gain insight into physical properties of prominences that cannot be derived from direct observation. In this paper we discuss works that have not been described in previous reviews, namely the first seismological application to solar prominences and theoretical advances on the attenuation of prominence oscillations.
title: Die Wälzlagerimpedanz als Werkzeug zur Untersuchung von Oberflächenabweichungen in Wälzlagern
Creators: name: Martin, Georg
Publisher: name: UNSPECIFIED
Year: 2021

description: In der Wälzlagerforschung ist seit langem bekannt, dass die elektrische Impedanz von Wälzlagern durch die Schmierfilmdicke, die Hertzsche Fläche sowie durch metallische Kontakte von Rauheitsspitzen im Wälzkontakt bestimmt wird. Die Frage, ob diese Zusammenhänge genutzt werden können, um anhand der Impedanz auf die Oberflächeneigenschaften zu schließen, wurde bisher nicht betrachtet. Da Wälzlagerschäden, z.B. Pittings, Abweichungen der Oberflächen von der Nenngeometrie sind, können solche Rückschlüsse genutzt werden, um Wälzlagerschäden im Sinne einer Zustandsüberwachung zu diagnostizieren. Als Grundlage für die Entwicklung dieses Ansatzes zur Zustandsüberwachung wird in dieser Arbeit untersucht, wie die Wälzlagerimpedanz mit Oberflächenabweichungen zusammenhängt. Dafür wird zunächst eine hochfrequente Messung der Lagerimpedanz entwickelt und umgesetzt. Daraufhin werden Dauerversuche mit fünf Schrägkugellagern durchgeführt, wobei die Impedanz bis zur Entstehung eines Pittings und darüber hinaus während des weiteren Fortschreitens des Schadens, gemessen wird. Es zeigen sich charakteristische Ausschläge in den Impedanzsignalen, die den entstandenen Schäden zugeordnet werden können. Um ein besseres Verständnis der Zusammenhänge zwischen Impedanz und Oberflächenabweichungen zu erlangen, wird eine weitere Versuchsreihe mit künstlich eingebrachten Strukturen durchgeführt. Dabei werden verschiedene Merkmale der Ausschläge im Impedanzsignal untersucht, davon erweisen sich zwei Merkmale als besonders aussagekräftig, um die eingebrachten Oberflächenstrukturen zu charakterisieren. Anhand der Dauer der Ausschläge kann auf die Länge der Strukturen geschlossen werden. Anhand des zeitlichen Abstands kann, durch Zuordnung zu den Überrollfrequenzen, erkannt werden kann ob eine Oberflächenabweichung auf dem Außenring, dem Innenring oder einem Wälzkörper vorliegt. Diese an künstlichen Oberflächenstrukturen gewonnenen Erkenntnisse werden abschließend auf die Daten der Dauerversuche angewandt. Die Dauer der Ausschläge stimmt bei drei von fünf Lagern gut mit der tatsächlichen Schadenslänge überein, bei zwei weiteren Lagern können keine validen Aussagen abgeleitet werden. Die Zuordnung eines Schadens zu Außenring oder Innenring - Wälzkörperschäden traten nicht auf - ist anhand der Überrollfrequenzen in allen fünf Lagern möglich. Die prinzipielle Eignung der Impedanz als Werkzeug zur Zustandsüberwachung wird damit bestätigt. Um die verbleibenden Unsicherheiten zu reduzieren, eine zuverlässige Diagnose zu erreichen und ein praktisch anwendbares Werkzeug zu entwickeln, sind weitere experimentelle oder numerische Untersuchungen nötig, die abschließend skizziert werden.
Spectroscopy of High-Redshift Supernovae from the ESSENCE Project: The First Four Years
Creators: name: Foley, R. J.
name: Matheson, T.
name: Blondin, S.
name: Chornock, R.
name: Silverman, J. M.
name: Challis, P.
name: Clocchiatti, A.
name: Filippenko, A. V.
name: Kirshner, R. P.
name: Leibundgut, B.
name: Sollerman, J.
name: Spyromilio, J.
name: Tonry, J. L.
name: Davis, T. M.
name: Garnavich, P. M.
name: Jha, S. W.
name: Krisciunas, K.
name: Li, W.
name: Pignata, G.
name: Rest, A.
name: Riess, A. G.
name: Schmidt, B. P.
name: Smith, R. C.
name: Stubbs, C. W.
name: Tucker, B. E.
name: Wood-Vasey, W. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of spectroscopic observations from the ESSENCE high-redshift supernova (SN) survey during its first four years of operation. This sample includes spectra of all SNe Ia whose light curves were presented by Miknaitis et al. (2007) and used in the cosmological analyses of Davis et al. (2007) and Wood-Vasey et al. (2007). The sample represents 273 hours of spectroscopic observations with 6.5 - 10-m-class telescopes of objects detected and selected for spectroscopy by the ESSENCE team. We present 174 spectra of 156 objects. Combining this sample with that of Matheson et al. (2005), we have a total sample of 329 spectra of 274 objects. From this, we are able to spectroscopically classify 118 Type Ia SNe. As the survey has matured, the efficiency of classifying SNe Ia has remained constant while we have observed both higher-redshift SNe Ia and SNe Ia farther from maximum brightness. Examining the subsample of SNe Ia with host-galaxy redshifts shows that redshifts derived from only the SN Ia spectra are consistent with redshifts found from host-galaxy spectra. Moreover, the phases derived from only the SN Ia spectra are consistent with those derived from light-curve fits. By comparing our spectra to local templates, we find that the rate of objects similar to the overluminous SN 1991T and the underluminous SN 1991bg in our sample are consistent with that of the local sample. We do note, however, that we detect no object spectroscopically or photometrically similar to SN 1991bg. Although systematic effects could reduce the high-redshift rate we expect based on the low-redshift surveys, it is possible that SN 1991bg-like SNe Ia are less prevalent at high redshift.
description: 21 pages, 17 figures, accepted to AJ
Broad host-range pathogens as bioherbicides: managing nontarget plant disease risk
Creators: name: Bourdot, Graeme
name: Casonato, Seona
Publisher: name: AgResearch
Year: 2023
Subjects: Plant biology

description: Plant pathogens with a broad host range are commercially more attractive as microbial bioherbicides than strictly host-specific pathogens as a result of the wider market potential of a product capable of controlling multiple species. However, the perceived spatiotemporal disease risk to nontarget plants is a barrier to their adoption for weed control. We consider two approaches to managing this risk. First, we consider safety zones and withholding periods for bioherbicide treatment sites. These must ensure inoculum spreading from, or surviving at the site, exposes nontarget plants to no more inoculum than from natural sources. They can be determined using simple dispersal models. We show that a ratio of added:natural inoculum of 1.0 is biologically reasonable as an ‘acceptable risk’ and a sound basis for safety zones and withholding periods. These would be analogous to the ‘conditions of use’ for synthetic chemical herbicides aimed at minimizing collateral damage to susceptible plants from spray drift and persistent soil residues. Second, weed-specific isolates of broad host-range pathogens may avoid the need for safety zones and withholding periods. Such isolates have been found in many broad host-range pathogen species. Their utilization as bioherbicides may more easily meet the requirements of regulators. Mixtures of different weed-specific isolates of a pathogen could provide bioherbicides with commercially attractive spectrums of weed control activity.
Why Turing mechanism is an obstacle to stationary periodic patterns in bounded reaction-diffusion media with advection
Creators: name: Yochelis, Arik
name: Sheintuch, Moshe
Publisher: name: arXiv
Year: 2009
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: This paper has been withdrawn by the author(s), due to review of the paper in Physical Chemistry Chemical Physics.
description: This paper has been withdrawn
Proteogenomic analysis unveils the HLA Class I presented immunopeptidome in melanoma and EGFR mutant lung adenocarcinoma
Creators: name: Qi, Yue A.
name: Maity, Tapan
name: Cultraro, Constance M.
name: Misra, Vikram
name: Zhang, Xu
name: Ade, Catherine
name: Shaojian Gao
name: Milewski, David
name: Nguyen, Khoa D.
name: Ebrahimabadi, Mohammad H.
name: Ken-Ichi Hanada
name: Khan, Javed
name: Sahinalp, Cenk
name: Yang, James C.
name: Udayan Guha
Publisher: name: figshare
Year: 2020
Subjects: subject: 110709 Tumour Immunology
subject: FOS: Clinical medicine

description: Immune checkpoint inhibitor and adoptive lymphocyte transfer-based therapies have shown great therapeutic potential for cancers with high tumor mutation burden (TMB). Here, we employed mass spectrometry (MS)-based proteogenomic large-scale profiling to identify potential immunogenic human leukocyte antigen (HLA) Class ǀ-presented peptides in both melanoma, a “hot tumor” with high TMB, and EGFR mutant lung adenocarcinoma, a “cold tumor” with low TMB. We identified several classes of neopeptides, including mutated neoantigens and more than 1000 post-translationally modified peptides representing 58 different PTMs. We constructed a cancer germline (CG) antigen database with 285 antigens and identified 42 Class I-presented CG antigens. Finally, we developed a non-canonical peptide discovery pipeline to identify 44 lncRNA-derived peptides and validated Class I binding for select neopeptides. We provide direct evidence of HLA Class I presentation of a large number of neopeptides for potential vaccine or adoptive cell therapy in melanoma and mutant EGFR lung cancer.
Dissipative and nonaxisymmetric standard-MRI in Kepler disks
Creators: name: Kitchatinov, L. L.
name: Ruediger, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Deviations from axial symmetry are necessary to maintain self-sustained MRI-turbulence. We define the parameters region where nonaxisymmetric MRI is excited and study dependence of the unstable modes structure and growth rates on the relevant parameters. We solve numerically the linear eigenvalue problem for global axisymmetric and nonaxisymmetric modes of standard-MRI in Keplerian disks with finite diffusion. For small magnetic Prandtl number the microscopic viscosity completely drops out from the analysis so that the stability maps and the growth rates expressed in terms of the magnetic Reynolds number Rm and the Lundquist number S do not depend on the magnetic Prandtl number Pm. The minimum magnetic field for onset of nonaxisymmetric MRI grows with Rm. For given S all nonaxisymmetric modes disappear for sufficiently high Rm. This behavior is a consequence of the radial fine-structure of the nonaxisymmetric modes resulting from the winding effect of differential rotation. It is this fine-structure which presents severe resolution problems for the numerical simulation of MRI at large Rm. For weak supercritical magnetic fields only axisymmetric modes are unstable. Nonaxisymmetric modes need stronger fields and not too fast rotation. If Pm is small its real value does not play any role in MRI.
description: 4 pages, 6 figures, A&A Letter
Classical Phase Transitions of Geometrically Constrained O($N$) Spin Systems
Creators: name: Xu, Cenke
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the phase transition between the high temperature algebraic liquid phase and the low temperature ordered phase in several different types of locally constrained O(N) spin systems, using a unified constrained Ginzburg-Landau formalism. The models we will study include: 1, O(N) spin-ice model with cubic symmetry; 2, O(N) spin-ice model with easy-plane and easy-axis anisotropy; 3, a novel O(N) "spin-plaquette" model, with a very different local constraint from the spin-ice. We calculate the renormalization group equations and critical exponents using a systematic ε= 4 - d expansion with constant N, stable fixed points are found for large enough N. In the end we will also study the situation with softened constraints, the defects of the constraints will destroy the algebraic phase and play an important role at all the transitions.
description: 13 pages, 2 figures
Complexity and neutron stars structure
Creators: name: Chatzisavvas, K. Ch.
name: Psonis, V. P.
name: Panos, C. P.
name: Moustakidis, Ch. C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We apply the statistical measure of complexity introduced by Lopez-Ruiz, Mancini and Calbet to neutron stars structure. Neutron stars is a classical example where the gravitational field and quantum behavior are combined and produce a macroscopic dense object. Actually, we continue the recent application of Sanudo and Pacheco to white dwarfs structure. We concentrate our study on the connection between complexity and neutron star properties, like maximum mass and the corresponding radius, applying a specific set of realistic equation of states. Moreover, the effect of the strength of the gravitational field on the neutron star structure and consequently on the complexity measure is also investigated. It is seen that neutron stars, consistent with astronomical observations so far, are ordered systems (low complexity), which cannot grow in complexity as their mass increases. This is a result of the interplay of gravity, the short-range nuclear force and the very short-range weak interaction.
description: Preprint, 23 pages, 28 figures
title: Untersuchungen zur Wertstoffrückgewinnung aus Industrieabwässern mit Membranverfahren
Creators: name: Nguyen, Le Quynh Thu
Publisher: name: UNSPECIFIED
Year: 2021

description: Die vorliegende Arbeit erfasst das stoffliche Rückgewinnungspotential aus industriellen Prozesswässern der Herstellung von Chitin und Konsumgüterprodukten mittels Filtrations-verfahren in einem vietnamesischen Industriepark. Die Schwerpunkte lagen in der Leistungsbeurteilung der Verfahren unter den örtlichen Randbedingungen sowie in der Gesamtbewertung des ressourceneffizienten Konzeptes in den lokalen Betrieben. Im Rahmen dieser Arbeit wurden zwei Fallstudien durchgeführt: Fallstudie 1 untersuchte die Rückgewinnung von Proteinen eines Teilstroms der Chitin-Produktion. Fallstudie 2 bearbeitete die Rückgewinnung von Tensiden und Rohprodukten aus der Herstellung von Textil- und Körperpflegemitteln. Innerbetriebliche Bestandsaufnahmen und begleitende Messkampagnen an den betrachteten Teilströmen waren wichtige Voraussetzungen für die Einschätzung des Rückgewinnungspotentials.
Local Existence for the One-dimensional Vlasov-Poisson System with Infinite Mass
Creators: name: Pankavich, Stephen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L60; 35Q99; 82C21; 82C22; 82D10

description: A collisionless plasma is modeled by the Vlasov-Poisson system in one dimension. We consider the situation in which mobile negative ions balance a fixed background of positive charge, which is independent of space and time, as x tends to positive or negative infinity. Thus, the total positive charge and the total negative charge are both infinite. Smooth solutions with appropriate asymptotic behavior are shown to exist locally in time, and criteria for the continuation of these solutions are established.
description: 17 pages, no figures
Higgs self-coupling measurements at the FCC-hh
Creators: name: Stapf, Birgit
name: Taliercio, Angela
name: Gallo-Voss, Elisabetta
name: Tackmann, Kerstin
name: Mastrapasqua, Paola
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: potential, Higgs
coupling, Higgs
electroweak interaction, symmetry breaking
p p, scattering
FCC-hh
hadron
new physics
pair production
FCC
precision measurement
direct detection
TeV

description: The hadron collider phase of the Future Circular Collider (FCC-hh) is a proton-proton collider operating at a center-of-mass energy of 100 TeV. It is one of the most ambitious projects planned for the rest of this century and offers ample opportunities in the hunt for new physics, both through its direct detection reach as well as through indirect evidence from precision measurements. Extracting a precision measurement of the Higgs self-coupling from the Higgs pair production cross-section will play a key role in our understanding of electroweak symmetry breaking, as the self-coupling gives insight into the nature of the Higgs potential. With the large data set of in total 30 $\text{ab}^{-1}$ which is envisioned to be collected during the FCC-hh runtime the Higgs self-coupling will be determined down to the percent level. This paper presents prospect studies for Higgs self-coupling measurements in the $b\bar{b}\gamma\gamma$ and $b\bar{b}\ell\ell + E_{\text{T}}^{\text{miss}}$ final states, with the combined, expected precision on the Higgs self-coupling modifier $\kappa_{\lambda}$ reaching 3.2-5.7% at 68% confidence level, assuming all other Higgs couplings follow their Standard Model expectations and depending on the systematic uncertainties assumed. This high precision is mostly driven by the $b\bar{b}\gamma\gamma$ final state analysis, while the $b\bar{b}\ell\ell + E_{\text{T}}^{\text{miss}}$ final state - newly studied for its FCC-hh prospects in this document - on its own reaches a maximum precision of roughly 20% on $\kappa_{\lambda}$.
Cost Effectiveness Analysis of Cilostazol Treatment in Patients with Aneu -  rysmal Subarachnoid Hemorrhage
Creators: name: Zeenat Qureshi Stroke Institutes
Publisher: name: Zenodo
Year: 2023

description: Objective— Cilostazol, a selective phosphodiesterase type III inhibitor, has been shown to prevent cerebral ischemiarelated to cerebral vasospasm and rates of death or disability in patients with aneurysmal subarachnoid hemorrhage.In this study, the authors’ goal was to compare the cost-effectiveness of cilostazol treatment (over no treatment) inaneurysmal subarachnoid hemorrhage patients with secured ruptured intracranial aneurysm.Methods— Clinical data and quality of life values were obtained from the previous randomized clinical trials. Costestimates were derived from the Nationwide Inpatient Data, data from long-term care in stroke patients, and relevantliterature. Incremental cost-effectiveness ratios were estimated during a 1-year period. Parametric bootstrapping wasused to determine the uncertainty of the estimates.Results— The overall quality-adjusted life years for patients with aneurysmal subarachnoid hemorrhage treatedwith cilostazol was 0.723 (95th percentile range 0.6723–0.7652) and for those not treated with cilostazol was 0.635(95th percentile 0.5859–0.6762). The cost per quality-adjusted life years for 100 patients with aneurysmal subarach-noid hemorrhage treated with cilostazol was $109,140.3 (95th percentile range $103,149.8-$117,403.3) and for thosenot treated with cilostazol was $132,235.6 (95th percentile range $124,139.6–$143,272.2). The mean estimate incre-mental cost-effectiveness ratios for cilostazol treatment versus no treatment was $-58,802.06 per quality-adjusted lifeyears gained (95% confidence interval $-58,812.17 to $-58,791.95).Conclusions— We found that cilostazol treatment was highly cost-effective in reducing death or disability in pa-tients with aneurysmal subarachnoid hemorrhage. A large clinical trial is warranted to evaluate the therapeutic valueof cilostazol in patients with aneurysmal subarachnoid hemorrhage.