cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simulation of Coupled Heat and Mass Transport With Reaction in PEM Fuel Cell Cathode using Lattice Boltzmann Method
Creators: name: Jithin, M.
name: Siddharth, Saurabh
name: Das, Malay K.
name: De, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Fluid, heat and species transport and oxygen reduction in the cathode of a PEM fuel cell are simulated using multi relaxation lattice Boltzmann method. Heat generation due to oxygen reduction and its effects on transport and reaction are considered. Simulations for various cell operating voltages, temperatures and flow rates with various values of porous media properties, namely, permeability, porosity, and effective porous media diffusion coefficient, are performed to study transport and operating characteristics in the electrode. It is seen that maximum output power density achievable is limited by the mass transport rate. A small increase in current density is obtained by increasing the operating temperature. However, this results in an increase in the rate of heat generation. Permeability and porosity of the gas diffusion layer do not show a significant impact on the performance in the range of values presently simulated. Higher permeability, in turn, resulted in enhancement of thermal gradients in the porous layer. A significant increase in the maximum current density obtainable is observed with increase in flow rates. The higher convection associated with high flow rate facilitates better transport of species and heat at the catalyst layer resulting in larger current density with a lesser chance of hotspot formation. Increased species diffusion coefficient also resulted in increasing the power output substantially. In addition, the fuel utilization is also improved at high diffusion rates in the porous media. The study analyses and shows the impact of various operating and material parameters affecting the performance of a PEM fuel cell with special attention on enhancing the maximum power density attainable.
GM 23 Tutorial: TUT 3 - Generic Modeling of Inverter Based Resources (IBR) and Load for Power System Planning Studies (slides)
Creators: Deepak Ramasubramanian
Pouyan Pourbeik
Juan J. Sanchez-Gasca
Vijay Vittal
Shruti Dwarkanath Rao
Parag Mitra
Wes Baker
Publisher: name: IEEE
Year: 2023

Inverter control systems are highly proprietary in nature and typically are protected by vendors. As a result, carrying out transmission system planning studies can be cumbersome wherein the exact type of inverter control is unknown. Generic models can help play a role in this space, among other use cases. This tutorial will provide an overview of the state of the art of generic modeling of IBRs for grid studies both in strong and weak grids. Additionally, the tutorial will also cover the state of the art in aggregate modeling of distributed energy resources (DERs) and load, whose representation is crucial for informed power system planning.
Inverter control systems are highly proprietary in nature and typically are protected by vendors. As a result, carrying out transmission system planning studies can be cumbersome wherein the exact type of inverter control is unknown. Generic models can help play a role in this space, among other use cases. This tutorial will provide an overview of the state of the art of generic modeling of IBRs for grid studies both in strong and weak grids. Additionally, the tutorial will also cover the state of the art in aggregate modeling of distributed energy resources (DERs) and load, whose representation is crucial for informed power system planning.
Imaging the cool stars in the interacting binaries AE Aqr, BV Cen and V426 Oph
Creators: name: Watson, C. A.
name: Steeghs, D.
name: Dhillon, V. S.
name: Shahbaz, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is well known that magnetic activity in late-type stars increases with increasing rotation rate. Using inversion techniques akin to medical imaging, the rotationally broadened profiles from such stars can be used to reconstruct `Doppler images' of the distribution of cool, dark starspots on their stellar surfaces. Interacting binaries, however, contain some of the most rapidly rotating late-type stars known and thus provide important tests of stellar dynamo models. Furthermore, magnetic activity is thought to play a key role in their evolution, behaviour and accretion dynamics. Despite this, we know comparatively little about the magnetic activity and its influence on such binaries. In this review we summarise the concepts behind indirect imaging of these systems, and present movies of the starspot distributions on the cool stars in some interacting binaries. We conclude with a look at the future opportunities that such studies may provide.
description: 4 pages, 3 figures. Conference proceedings for the N+N+N Workshop, "From our star to far stars: Variation and Variability". Accepted for publication in Astronomische Nachrichten
Porous textured ceramics with controlled grain size and orientation
Creators: name: Behera, Rohit Pratyush
name: Muhammad, Syafiq Bin Senin
name: Jiaxuan, Marcus He
name: Ferrand, Hortense Le
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Texture in dense or porous ceramics can enhance their functional and structural properties. Current methods for texturation employ anisotropic particles as starting powders and processes that drive their orientation into specific directions. Using ultra-low magnetic fields combined with slip casting, it is possible to purposely orient magnetically responsive particles in any direction. When those particles are suspended with nanoparticles, templated grain growth occurs during sintering to yield a textured ceramic. Yet, the final grains are usually micrometric, leading weak mechanical properties. Here, we explore how to tune the grain orientation size using magnetic slip casting and templated grain growth. Our strategy consists in changing the size of the anisotropic powders and ensuring that magnetic alignment and densification occurs. The obtained ceramics featured a large range of grain anisotropy, with submicrometric thickness and anisotropic properties. Textured ceramics with tunable grains dimensions and porosity are promising for filtering, biomedical or composite applications.
MECHANICAL DESIGN OF DEXTEROUS MANIPULATOR LINKS
Creators: name: Carlsen, Christopher James
Publisher: name: Digital Repository at the University of Maryland
Year: 2018
Subjects: subject: Aerospace engineering
subject: Design
subject: Dexterous
subject: Manipulator
subject: Mechanical
subject: Robot
subject: Space

description: This paper explores the challenges of dense structure-electronics packaging, specifically for a structural and electronics upgrade to the Ranger Tele-robotic Shuttle Experiment (RTSX) manipulators at the University of Maryland (UMD). Long serial-link manipulators are popular in the space industry, where the need for a long reach and high manipulability outweighs the need for high tip stiffness. For larger systems with co-located electronics, such as those used to berth vehicles on orbit, electronics packaging is not inhibited by the diameter of the link body. As link diameter decreases, co-locating electronics in the manipulator becomes diffcult without adding external extensions to house them. In such densely packed bodies, the control electronics are so integrated with structure that electronics maintenance requires disassembly of primary structure.
Nonlinear Photoluminescence Excitation Spectroscopy of Carbon Nanotubes: Exploring the Upper Density Limit of One-Dimensional Excitons
Creators: name: Murakami, Y.
name: Kono, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied emission properties of high-density excitons in single-walled carbon nanotubes through nonlinear photoluminescence excitation spectroscopy. As the excitation intensity was increased, all emission peaks arising from different chiralities showed clear saturation in intensity. Each peak exhibited a saturation value that was independent of the excitation wavelength, indicating that there is an upper limit on the exciton density for each nanotube species. We developed a theoretical model based on exciton diffusion and exciton-exciton annihilation that successfully reproduced the saturation behavior, allowing us to estimate exciton densities. These estimated densities were found to be still substantially smaller than the expected Mott density even in the saturation regime, in contrast to conventional semiconductor quantum wires.
description: 4 pages, 4 figures
The coins from the excavations of Vetricella (Scarlino, Grosseto). Notes on the Pavese issues of Berengar I
Creators: name: Rovelli, Alessia
Publisher: name: Zenodo
Year: 2020

description: Rovelli, A., The coins from the excavations of Vetricella (Scarlino, Grosseto). Notes on the Pavese issues of Berengar I, in The nEU-Med project : Vetricella, an early medieval royal property on Tuscany’s Mediterranean, a cura di G. Bianchi e R. Hodges, Firenze 2020, pp. 89-97. ISBN : 978-88-7814-971-7
Water-deficit and fungal infection can differentially affect the production of different classes of defense compounds in two host pines of mountain pine beetle
Creators: name: Erbilgin, Nadir; Cale, Jonathan; Lusebrink, Inka; Najar, Ahmed; Klutsch, Jennifer; Sherwood, Patrick; Bonello, Pierluigi; Evenden, Maya
Publisher: name: University of Alberta Libraries
Year: 2016

Abstract
Quantum Electrodynamics of qubits
Creators: name: Bialynicki-Birula, Iwo
name: Sowinski, Tomasz
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Systematic description of a spin one-half system endowed with magnetic moment or any other two-level system (qubit) interacting with the quantized electromagnetic field is developed. This description exploits a close analogy between a two-level system and the Dirac electron that comes to light when the two-level system is described within the formalism of second quantization in terms of fermionic creation and annihilation operators. The analogy enables one to introduce all the powerful tools of relativistic QED (albeit in a greatly simplified form). The Feynman diagrams and the propagators turn out to be very useful. In particular, the QED concept of the vacuum polarization finds its close counterpart in the photon scattering off a two level-system leading via the linear response theory to the general formulas for the atomic polarizability and the dynamic single spin susceptibility. To illustrate the usefulness of these methods, we calculate the polarizability and susceptibility up to the fourth order of perturbation theory. These {\em ab initio} calculations resolve some ambiguities concerning the sign prescription and the optical damping that arise in the phenomenological treatment. We also show that the methods used to study two-level systems (qubits) can be extended to many-level systems (qudits). As an example, we describe the interaction with the quantized electromagnetic field of an atom with four relevant states: one S state and three degenerate P states.
description: 23 pages, 6 figures
Continual Learning in Sensor-based Human Activity Recognition: an Empirical Benchmark Analysis
Creators: name: Jha, Saurav
name: Schiemer, Martin
name: Zambonelli, Franco
name: Ye, Juan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Sensor-based human activity recognition (HAR), i.e., the ability to discover human daily activity patterns from wearable or embedded sensors, is a key enabler for many real-world applications in smart homes, personal healthcare, and urban planning. However, with an increasing number of applications being deployed, an important question arises: how can a HAR system autonomously learn new activities over a long period of time without being re-engineered from scratch? This problem is known as continual learning and has been particularly popular in the domain of computer vision, where several techniques to attack it have been developed. This paper aims to assess to what extent such continual learning techniques can be applied to the HAR domain. To this end, we propose a general framework to evaluate the performance of such techniques on various types of commonly used HAR datasets. We then present a comprehensive empirical analysis of their computational cost and effectiveness of tackling HAR-specific challenges (i.e., sensor noise and labels' scarcity). The presented results uncover useful insights on their applicability and suggest future research directions for HAR systems. Our code, models and data are available at https://github.com/srvCodes/continual-learning-benchmark.
description: Accepted in the Information Sciences journal
GM 23 Tutorial: TUT 6 - Dynamic Grid Stabilization with Grid-Forming + Energy Storage Technologies (slides)
Creators: Jan Paramalingam
Martin Cameron
Mikael Halonen
David Langner
Joe Warner
Sergey Kynev
Dr. Sahar Pirooz Azad
Dr. Marco Lindner
Dr. Jef Beerten
Dr. Rajiv K. Varma
Publisher: name: IEEE
Year: 2023

This tutorial presents approaches to planning and specification, technology principles with example installations, a comparative evaluation of performance, and an analysis of future trends expected to influence technology development and its place in the market. The technology includes synchronous condensers, static var compensators (SVC), static synchronous compensators (STATCOM), STATCOMs with energy storage, utilization of Solar PV systems as STATCOM (PV-STATCOM), and VSC HVDC.
This tutorial presents approaches to planning and specification, technology principles with example installations, a comparative evaluation of performance, and an analysis of future trends expected to influence technology development and its place in the market. The technology includes synchronous condensers, static var compensators (SVC), static synchronous compensators (STATCOM), STATCOMs with energy storage, utilization of Solar PV systems as STATCOM (PV-STATCOM), and VSC HVDC.
On bilinear biquandles
Creators: name: Nelson, Sam
name: Rische, Jacquelyn L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M27; 17D99

description: We define a type of biquandle which is a generalization of symplectic quandles. We use the extra structure of these bilinear biquandles to define new knot and link invariants and give some examples.
description: 9 pages. To appear in Colloquium Mathematicum
Development and test of tunable mechanical monolithic horizontal accelerometer for low frequency seismic noise measurement
Creators: name: Giordano, Gerardo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: This thesis describes a mechanical horizontal monolithic sensor for geophysical applications. The instrument is basically a monolithic tunable folded pendulum, shaped with precision machining and electric-discharge-machining, that can be used both as seismometer and, in a force-feedback configuration, as accelerometer. It is a very compact instrument, very sensitive in the low-frequency seismic noise band, with a very good immunity to environmental noises, whose main characteristics are the tunability of the resonance frequency and the integrated laser optical readout, consisting of an optical lever and an interferometer. The theoretical sensitivity curves are in a very good agreement with the measurements. A direct comparison of its performances with the STS-2 ones shows that better performances have been reached with the interferometric readout, about 10e-12 m/sqrt(Hz) in the band [0.01,10] Hz as seismometer. The first results as accelerometer (force feed-back configuration) are also presented and discussed.
GM 23 Tutorial: TUT 4 - Probabilistic Energy Forecasting: Methodologies, Implementations, and Applications (slides)
Creators: Dr. Jethro Browell
Dr. Yi Wang
Dr. Tao Hong
Dr. Bri-Mathias Hodge
Publisher: name: IEEE
Year: 2023

The increasing integration of weather-dependent renewable energy and flexible loads introduces great complexity and uncertainty to power systems. Modern power systems rely on forecasts of many variables from minutes to weeks ahead to maintain reliable and economic operation. Probabilistic forecasts empower decision-makers with information about forecast uncertainty and play an important role in a growing number of power systems around the world. This tutorial introduces probabilistic forecasting, describes leading methods for load, price, wind, and solar forecasting, and explains how these forecasts are used in power systems. It is delivered by leading researchers who have developed these methods and supported their adoption energy industry in the US, Europe, and beyond.
The increasing integration of weather-dependent renewable energy and flexible loads introduces great complexity and uncertainty to power systems. Modern power systems rely on forecasts of many variables from minutes to weeks ahead to maintain reliable and economic operation. Probabilistic forecasts empower decision-makers with information about forecast uncertainty and play an important role in a growing number of power systems around the world. This tutorial introduces probabilistic forecasting, describes leading methods for load, price, wind, and solar forecasting, and explains how these forecasts are used in power systems. It is delivered by leading researchers who have developed these methods and supported their adoption energy industry in the US, Europe, and beyond.
Isolated unstable Weibel modes in unmagnetized plasmas with tunable asymmetry
Creators: name: Tautz, R. C.
name: Lerche, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this letter, an initially unmagnetized pair plasma with asymmetric velocity distributions is investigated where any unstable Weibel mode must be isolated, with discrete values for the growth rates and the unstable wavenumbers. For both a non-relativistic distribution with thermal spread and a high-relativistic two-stream distribution it is shown that isolated modes are excited and that, as the asymmetry tends to zero, the growth rate remains finite, as long as the distribution function is not precisely symmetric.
description: Comments: references added
A materials perspective on the design of damage-resilient artificial bones and bone implants through additive/advanced manufacturing
Creators: name: Ferrand, Hortense Le
name: Athanasiou, Christos E
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: After more than five decades of research, the failure of bone implants is still an issue that becomes increasingly urgent to solve in our ageing population. Among the reasons for failure, catastrophic brittle fracture is one event that is directly related to the implant s material and fabrication and that deserves more attention. Indeed, clinically available implants pale at reproducing the hierarchical and heterogeneous microstructural organization of our natural bones, ultimately failing at reproducing their mechanical strength and toughness. Nevertheless, the recent advances in additive and advanced manufacturing open new horizons for the fabrication of biomimetic bone implants, challenging at the same time their characterization, testing and modelling. This critical review covers selected recent achievements in bone implant research from a materials standpoint and aims at deciphering some of the most urgent issues in this multidisciplinary field.
Das Rind: ein klassischer Holobiont
Creators: name: Brade, Wilfried
Publisher: name: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft
Year: 2021

description: Zusammenfassung Das Rind ist ein typischer Holobiont. Die Bewertung komplexer Phänotypen erfordert deshalb nicht nur die Bewertung der Heritabilität (h²) sondern auch der Mikrobiabilität (m²). Wir stehen allerdings erst am Anfang die zugrunde liegenden Beziehungen zwischen Wirtsgenom, Mikrobiom und speziellen Umweltfaktoren merkmalsspezifisch zu erfassen. Am Beispiel der Methanbildung wird gezeigt, dass - obwohl Wiederkäuer keine Gene für die CH4-Bildung in ihrem Genom besitzen - eine zugehörige genetische Komponente seitens der Wirtstiere existiert. Das ruminale Mikrobiom determiniert etwa 15% bis 20% der Varianz des CH4-Ertrages. Im Hinblick auf eine weitere Minderung der CH4-Emission im Rahmen sehr intensiver Milchproduktionssysteme mit Holsteinrindern (mittlere Laktationsleistungen ≥11.000 kg Milch(EKM)/Kuh/Laktation) sind zugehörige CH4-Minderungspotenziale vorrangig durch diätetische Maßnahmen einschließlich Nutzung spezifischer Fütterungszusätze (z.B. 3-NOP), in einer (zukünftig) weiteren Manipulation des Mikrobioms sowie in indirekten tierbezogenen Einflussnahmen (z.B. Reduzierung der Tierverluste, Verbesserung der Nutzungsdauer der Muttertiere etc.) zu suchen. In weniger intensiven Milchproduktionssystemen bietet sich eine gezielte weitere Leistungssteigerung zusätzlich an. Summary The cattle: a classic holobiont Part 1: Varying hologenomes and methane formation The cattle is a typical holobiont. The evaluation of complex phenotypes therefore requires not only the evaluation of heritability (h²) but also of microbiability (m²). However, we are only just beginning to understand the underlying relationships between host genome, microbiome and special environmental factors. The example of methane formation shows that - although ruminants have no genes for CH4-formation in their genome - an associated genetic component exists on the part of host animals. The ruminale microbiome determines about 15% to 20% of the variance in CH4-yield. With regard to a further reduction in CH4-emissions in the context of very intensive milk production systems with Holstein cattle (mean lactation capacities ≥11,000 kg milk (EKM)/cow/lactation), associated CH4-reduction potentials are primarily through dietary measures, including the use of specific feeding additives (e.g. 3-NOP), further manipulation of the microbiome (in the future) as well as indirect animal-related influences (e.g. reduction of animal losses, improvement of the life time etc.). In less intensive milk production systems, a targeted further increase in performance is particularly useful
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Aktuelle Beiträge
Retrieval-Augmented Transformer-XL for Close-Domain Dialog Generation
Creators: name: Bonetta, Giovanni
name: Cancelliere, Rossella
name: Liu, Ding
name: Vozila, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Transformer-based models have demonstrated excellent capabilities of capturing patterns and structures in natural language generation and achieved state-of-the-art results in many tasks. In this paper we present a transformer-based model for multi-turn dialog response generation. Our solution is based on a hybrid approach which augments a transformer-based generative model with a novel retrieval mechanism, which leverages the memorized information in the training data via k-Nearest Neighbor search. Our system is evaluated on two datasets made by customer/assistant dialogs: the Taskmaster-1, released by Google and holding high quality, goal-oriented conversational data and a proprietary dataset collected from a real customer service call center. Both achieve better BLEU scores over strong baselines.
description: The International FLAIRS Conference Proceedings volume 34 issue 1
2021-2022 Series_02.NUCATS Work-Life Integration_11.11.2021
Creators: name: Allen, Norrina Bai
name: O'Brien, Matthew James
Publisher: name: Galter Health Science Library & Learning Center
Year: 2021

description: This workshop presentation: - Explores different ways to conceptualize the intersection of important domains in our lives (e.g.work-life integration vs.work-lifebalance vs. an integrated life)- Identifies priorities and goals for integrating these important domains both at work and outside of work- Discusses the challenges and opportunities related to our current remote working environment, and how this can be leveraged to achieve a more integrated life.
Hyperbolic Dynamical Systems
Creators: name: Araujo, Vitor
name: Viana, Marcelo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37-00

description: The theory of uniformly hyperbolic dynamical systems was initiated in the 1960's (though its roots stretch far back into the 19th century) by S. Smale, his students and collaborators, in the west, and D. Anosov, Ya. Sinai, V. Arnold, in the former Soviet Union. It came to encompass a detailed description of a large class of systems, often with very complex evolution. Moreover, it provided a very precise characterization of structurally stable dynamics, which was one of its original main goals. The early developments were motivated by the problem of characterizing structural stability of dynamical systems, a notion that had been introduced in the 1930's by A. Andronov and L. Pontryagin. Inspired by the pioneering work of M. Peixoto on circle maps and surface flows, Smale introduced a class of gradient-like systems, having a finite number of periodic orbits, which should be structurally stable and, moreover, should constitute the majority (an open and dense subset) of all dynamical systems. Stability and openness were eventually established, in the thesis of J. Palis. However, contemporary results of M. Levinson, based on previous work by M. Cartwright and J. Littlewood, provided examples of open subsets of dynamical systems all of which have an infinite number of periodic orbits.
description: 22 pages, 5 figures, enciclopedia article
Fluorescent oxide nanoparticles adapted to active tips for near-field optics
Creators: name: Cuche, A.
name: Masenelli, B.
name: Ledoux, G.
name: Amans, D.
name: Dujardin, C.
name: Sonnefraud, Y.
name: Melinon, P.
name: Huant, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a new kind of fluorescent oxide nanoparticles with properties well suited to active-tip based near-field optics. These particles with an average diameter in the range 5-10 nm are produced by Low Energy Cluster Beam Deposition (LECBD) from a YAG:Ce3+ target. They are studied by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), classical photoluminescence, cathodoluminescence and near-field scanning optical microscopy (NSOM). Particles of extreme photo-stability as small as 10 nm in size are observed. These emitters are validated as building blocks of active NSOM tips by coating a standard optical tip with a 10 nm thick layer of YAG:Ce3+ particles directly in the LECBD reactor and by subsequently performing NSOM imaging of test surfaces.
description: Changes made following Referee's comments; added references; one added figure. See story on this article at: http://nanotechweb.org/cws/article/tech/36063
title: Nasolacrimal intubation in transcanalicular endoscopic dacryoplasty: a long-term follow-up study
Creators: name: Zimmermann, Julian
name: Esser, Eliane Luisa
name: Merté, Ralph-Laurent
name: Danzer, Moritz Fabian
name: Rosenberger, Friederike
name: Brücher, Viktoria Constanze
name: Eter, Nicole
name: Alnawaiseh, Maged
name: Blumberg, Alina Friederike
name: Lahme, Larissa
name: Mihailović, Nataša
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2025
Subjects: subject: 610 Medicine and health

description: Nowadays, transcanalicular endoscopic dacryoplasty represents the majority of lacrimal duct surgery procedures performed in adults in specialised centers. However, there are still hardly any data available regarding the intra- and postoperative care, particularly regarding the duration of silicone tube intubation (STI). Our aim was to evaluate the relation between tube duration and recurrence of symptoms in patients who underwent transcanalicular microdrill dacryoplasty (MDP) in a long-term setting. Medical records of 576 adult patients after MDP were retrospectively reviewed. A total of 256 eyes of 191 patients could be included. The median follow-up time was 7.83 [7.08; 9.25] years. In 57.0% of the cases there was still full resolution of symptoms at the time of the survey. The median duration of the STI was 6 [3.00; 6:00] months. When distinguishing between a tube duration < 3 months and ≥ 3 months there was a significant difference in the long-term success rate (< 3 months: 38%; ≥ 3 months: 61%; p = 0.011). In conclusion, an early removal of the STI (< 3 months) after transcanalicular MDP seems to be associated with a higher incidence of recurrence of symptoms. This should be considered in the intra- and postoperative care of patients following this minimally invasive first-step procedure.
description: Finanziert über die DEAL-Vereinbarung mit Wiley, Springer oder Elsevier 2019–2023.
HYDROGEN AS ENERGY CARRIER: DECENTRALIZED PRODUCTION BY AUTOTHERMAL REFORMING OF METHANE
Creators: name: Scognamiglio, Diego
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: The aim of this PhD thesis will be the mathematical modeling of an autothermal reactor for
hydrogen production from methane, followed by an experimental campaign. Commercial
pellets catalysts will be employed, in particular Ni-based and Rh-based catalyst, and the
reactor will be designed in order to be highly compact, since the system is substantially
thought for automotive and/or residential purposes.
The attention will be focused on thermal profile developed along the catalytic bed, so that
catalyst thermal stress can be evaluated; indeed, the main problem that inhibits the
development of autothermal catalytic processes is the thermal deactivation due to high
temperatures reached. Catalyst thermal profile will be experimentally evaluated by means of
IR technology, in order to have a reliable validation of the mathematical model developed
for the reactor; then, simulations will be carried out on the reactor behaviour in situations
prohibitive from an experimental point of view.
The results will also be used for a comparison between the two commercial catalysts
selected.
GM 23 Tutorial: TUT 2 - Power System Stabilization via Excitation Control (Slides)
Creators: Les Hajagos
Ruediger Kutzner
Matthias Baechie
Uwe Seeger
Shawn Patterson
Publisher: name: IEEE
Year: 2023

In this tutorial feedback control and power system stability theory is presented to explain the foundation concepts of power system stabilization by excitation control. Tuning and testing techniques and application considerations are described. Both present-day stabilizer types and future directions in stabilizer design are explained.
In this tutorial feedback control and power system stability theory is presented to explain the foundation concepts of power system stabilization by excitation control. Tuning and testing techniques and application considerations are described. Both present-day stabilizer types and future directions in stabilizer design are explained.
GM 23 Tutorial: TUT 10 - Grid Energy Storage Meeting the Challenges of a Decarbonized Future (slides)
Creators: Rick Fiorvanti
Ray Byrne
Babu Chalamala
Ralph Masiello
Jim McDowall
Tu Nguyen
Yuliya Preger
Chris Searles
Charlie Vartanian
Publisher: name: IEEE
Year: 2023

This multi-presenter tutorial covers the basics of how electrical energy storage supports decarbonization initiatives across the U.S. To cover this topic, the 4-hour tutorial will be divided into four (4) sections, starting with a review of current technologies targeted for this area, e.g., lithium-ion pumped hydro, flow batteries, and long-duration energy storage. Next, market application challenges and valuations will be discussed where the focus will be on the duration needed in a decarbonized scenario and market products that may be required to ensure deployment. In the final two sections, the focus will shift to the engineering of energy storage systems, code compliance, and interconnection � including electrification technologies. The last section will review system safety and reliability.
This multi-presenter tutorial covers the basics of how electrical energy storage supports decarbonization initiatives across the U.S. To cover this topic, the 4-hour tutorial will be divided into four (4) sections, starting with a review of current technologies targeted for this area, e.g., lithium-ion pumped hydro, flow batteries, and long-duration energy storage. Next, market application challenges and valuations will be discussed where the focus will be on the duration needed in a decarbonized scenario and market products that may be required to ensure deployment. In the final two sections, the focus will shift to the engineering of energy storage systems, code compliance, and interconnection � including electrification technologies. The last section will review system safety and reliability.
Uninformed Bayesian Quantum Thermometry
Creators: name: Boeyens, Julia
name: Seah, Stella
name: Nimmrichter, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the Bayesian approach to thermometry with no prior knowledge about the expected temperature scale, through the example of energy measurements on fully or partially thermalized qubit probes. We show that the most common Bayesian estimators, namely the mean and the median, lead to high-temperature divergences when used for uninformed thermometry. To circumvent this and achieve better overall accuracy, we propose two new estimators based on an optimization of relative deviations. Their global temperature-averaged behavior matches a modified van Trees bound, which complements the Cramér-Rao bound for smaller probe numbers and unrestricted temperature ranges. Furthermore, we show that, using partially thermalized probes, one can increase the range of temperatures to which the thermometer is sensitive at the cost of the local accuracy.
description: 12 pages, 8 figures, v2: corrected conversion of the logarithmic error, v3: citations added
Das Rind: ein klassischer Holobiont
Creators: name: Brade, Wilfried
Publisher: name: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft
Year: 2021

description: Zusammenfassung Aufgrund der Aktivitäten des ruminalen Mikrobioms im Wirt (Milchkuh) enthält Milchfett viele verschiedene und teilweise sehr spezifische Fettsäuren (FS). Hierzu zählen beispielsweise ungeradzahlige und verzweigtkettige FS (OBCFA). Die hohe Vielfalt und Spezifität der FS in der Milch von Wiederkäuern könnten (zukünftig) als Biomarker für die Erfassung der praktizierten Fütterung (Beispiel: Frischgrasanteil in der Ration), für die Bewertung der ruminalen Gesundheit oder für die Quantifizierung der Aufnahme von Milch und -produkten seitens der Verbraucher und damit in der Humanernährung verwendet werden. Wir stehen jedoch erst am Anfang die Fülle von Informationen zu erfassen, die die FS-Zusammensetzung der Milch sowohl über die Kuh selbst, deren Fütterung und Gesundheit als auch über die erzeugte Milchqualität bereithält. Summary The cattle: a classic holobiont Part 2: Influence of the ruminal microbiome on the milk fatty acid composition Due to the activities of the ruminal microbiome in the host (milk cow), milk fat contains many different and sometimes very specific fatty acids (FA). These include, for example, odd and branched chain fatty acids (OBCFA). The high diversity and specificity of FA in ruminant milk could (in the future) serve as a biomarker for the recording of the practiced feeding (example: fresh grass portion in the ration), for the assessment of the ruminal health of the lactating ruminants or for the quantification of the consumption of milk and milk products by consumers and thus in human nutrition. However, we are only just beginning to to understand the wealth of information that the FS composition of the milk holds both about the cow itself, its feeding and health as well as about the milk quality produced.
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Aktuelle Beiträge
Possibili interazioni rifiuti-metano: emissioni diffuse da discarica e biometanazione da biomasse territorialmente significative
Creators: name: Caramiello, Cristina
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Al fine di quantificare le emissioni diffuse di biogas da un sito di discarica e di mettere a punto una metodologia per la valutazione dell’efficienza dei sistemi di captazione di biogas, è stato condotto un monitoraggio triennale presso la discarica per rifiuti non pericolosi sita nel Comune di Fano (provincia di Pesaro-Urbino, Regione Marche). Le misure di flusso ottenute sono state elaborate dapprima mediante un’analisi statistica preliminare grazie alla quale è stato possibile ottenere un primo confronto tra i dati puntuali di flusso registrati per ogni bacino e osservare il range di variazione dei flussi. Successivamente, tramite elaborazione geostatistica di detti dati puntuali, è stato possibile valutare i volumi di emissione per i singoli bacini e costruire delle mappe areali di flusso con la finalità di evidenziare le zone di maggiore emissione. Inoltre, avendo a disposizione i volumi di emissione e i dati gestionali della discarica riguardanti il biogas captato, è stato possibile calcolare un ipotetico, seppure incompleto, bilancio volumetrico di biogas per la discarica oggetto di studio.
Parallelamente sono stati condotti in scala da laboratorio test di biometanazione su diversi substrati organici al fine di determinarne la produzione potenziale di biogas e la percentuale di metano in esso contenuto, nonché l’efficienza di abbattimento dei Solidi Volatili del processo di digestione anaerobica in presenza di una soluzione tampone introdotta al fine di contrastare l’abbassamento del pH e il conseguente rallentamento del processo.
Spontaneous Breaking of Space-Time Symmetries
Creators: name: Rabinovici, Eliezer
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Kinematical and dynamical mechanisms leading to the spontaneous breaking of space-time symmetries are described. The symmetries affected are space and time translations, space rotations, scale and conformal transformations. Applications are made to solidification, string theory compactifications, the analysis of stable theories with no ground states, supersymmetry breaking and the determination of the value of the vacuum energy.
description: 37 pages, 18 figures. Based on the contribution to "String Theory and Fundamental Interactions. Celebrating Gabriele Veneziano on his 65th Birthday", edited by M. Gasperini and J. Maharana, to be published by Springer, and Lecture given at Les Houches summer school: "String Theory and The Real World From Particle Physics to Astrophysics", Session LXXXVII, 2007
GM 23 Tutorial: TUT 7 - Application of CIM-Based Methodologies to Utility Big Data Management and Real-Time Operation (slides)
Creators: Yidan Lu
Pedro Aneses
Jun Zhu
Xufeng Xu
Feng Tu
Publisher: name: IEEE
Year: 2023

With NERC pushing TOP-001-06, transmission operators are required to model external facilities and their impacts in their real-time operation model. However, differences in the format a structure of modeling data lead to challenges in inter-entity information exchange. To address this challenge, Common Information Model (CIM)-based methodologies were proposed to facilitate inter-corporate big data management. With API, the proposed methodologies successfully standardized and automated the procedure to integrate and maintain external regions of the En management System (EMS) of American Electric Power (AEP). For the past five years, the bulk and incremental CIM-based methodologies have facilitated more than thirty rounds of External Model Update (XMU) in AEP. Furthermore, R&D projects were launched to extend the compatibility of the proposed methodologies so that they can be used with different vendor-supplied EMS. The purpose of the tutorial is to share experience on utility modeling data management with fellow entities. We hope our practice could bring insights to industrial peers and further prom interoperability.
With NERC pushing TOP-001-06, transmission operators are required to model external facilities and their impacts in their real-time operation model. However, differences in the format a structure of modeling data lead to challenges in inter-entity information exchange. To address this challenge, Common Information Model (CIM)-based methodologies were proposed to facilitate inter-corporate big data management. With API, the proposed methodologies successfully standardized and automated the procedure to integrate and maintain external regions of the En management System (EMS) of American Electric Power (AEP). For the past five years, the bulk and incremental CIM-based methodologies have facilitated more than thirty rounds of External Model Update (XMU) in AEP. Furthermore, R&D projects were launched to extend the compatibility of the proposed methodologies so that they can be used with different vendor-supplied EMS. The purpose of the tutorial is to share experience on utility modeling data management with fellow entities. We hope our practice could bring insights to industrial peers and further prom interoperability.
Massive perturbers and the efficient merger of binary massive black holes
Creators: name: Perets, Hagai B.
name: Alexander, Tal
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that dynamical relaxation in the aftermath of a galactic merger and the ensuing formation and decay of a binary massive black hole (MBH), are dominated by massive perturbers (MPs) such as giant molecular clouds or clusters. MPs accelerate relaxation by orders of magnitude relative to 2-body stellar relaxation alone, and efficiently scatter stars into the binary MBH's orbit. The 3-body star-binary MBH interactions shrink the binary MBH to the point where energy losses from the emission of gravitational waves (GW) lead to rapid coalescence. We model this process based on observed and simulated MP distributions and take into account the decreased efficiency of the star-binary MBH interaction due to acceleration in the galactic potential. We show that mergers of gas-rich galactic nuclei lead to binary MBH coalescence well within the Hubble time. Moreover, lower-mass binary MBHs (<10^8 Msun) require only a few percent of the typical gas mass in a post-merger nucleus to coalesce in a Hubble time. The fate of a binary MBH in a gas poor galactic merger is less certain, although massive stellar structures (e.g. clusters, stellar rings) could likewise lead to efficient coalescence. These coalescence events are observable by their strong GW emission. MPs thus increase the cosmic rate of such GW events, lead to a higher mass deficit in the merged galactic core and suppress the formation of triple MBH systems and the resulting ejection of MBHs into intergalactic space.
description: 14 pages, 4 figures, 3 tables. More detailed explanations and changes in structure. Section on hypervelocity stars moved to another paper (in preparation). Results and conclusions unchanged. Accepted to ApJ
Hygroscopicity of Cholesterol in Various Organic Solvents
Creators: name: Barati, Farima
Publisher: name: Digital Repository at the University of Maryland
Year: 2018
Subjects: subject: Chemical engineering
subject: FOS: Chemical engineering

description: Organic aerosols and partially soluble particles can uptake water, form droplets and act as Cloud Condensation Nuclei (CCN). Cholesterol is a well-known organic aerosol. Cholesterol is insoluble in water (<0.002 gram in 100 ml of H2O) but dissolves in organic solvents. In this study, we examine the ability of cholesterol generated in three dilutions of 3 alcohols (ethanol, isopropanol and acetone) to act as CCN. The apparent hygroscopicity, κ, varies over two orders of magnitude, from ~ 0.001 to 0.1. We use statistical analysis of variance (ANOVA) to define significant physical and chemical factors that modify κ. Results show that as volume of water increases, κ changes. However, the type of alcohol does not significantly modify the hygroscopicity. Increases in alcohol concentration decrease droplet surface tension and change aerosol shape. Thus, the apparent κ is corrected with surface tension and shape factor data and estimated to be ~0.028 ± 0.02.
Monkeypox Virus Infection: A Global Health Emergency. A Contemporary Review with Emphasis on Prevention of the Next Pandemic
Creators: name: Zeenat Qureshi Stroke Institutes
Publisher: name: Zenodo
Year: 2023

description: Introduction— Cases of Monkeypox virus infections (MVI) have dramatically increased globally at an alarming rate over the past couple of months. The World Health Organization (WHO) declared MVI as global health emergency on July 23, 2022. Herein, we aim to summarize all available evidence and provide insights on preventing the next pandemic.Methods— We reviewed online data available from healthcare authorities, WHO, Centers of Disease Control (CDC), National Institutes of Health (NIH), PubMed, Medline, Google Scholar, Cochrane databases, grey literature, and from various studies published in peer-reviewed journals relevant to our topic. We used keywords, such as monkeypox, smallpox, Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-COV-2) pandemic, Coronavirus Disease-19 (COVID-19) pandemic, and public health policy among others. We compiled data based on demographics, recent travel history, and other pertinent findings to identify patterns of infection.Results— Outbreaks of MVI have been reported in 30 non-endemic countries, spanning six of the seven continents in the last few months. Preliminary data suggests that as of 06/08/2022 there are currently 829 confirmed cases in non-endemic countries. Gender information is available for only 231 infections. 227 (98.26%) of MVI were reported in adult men. The majority self-reported as homosexual or bisexual. Most cases reported in non-endemic countries have not been linked to direct travel to endemic countries; however, patients did report travel to other non-endemic countries that have reported outbreaks of MVI. ACAM2000 and JYNNEOS are two Food and Drug Administration (FDA) approved vaccines used for prevention of smallpox, which can be used for prevention of MVI. At present, vaccines are not recommended for prevention of MVI to the general population. Currently, there are two drugs, brincidofovir, and tecovirimat, that have been approved for the treatment of smallpox viral infection and proven effective against MVI in animal models.Conclusion— Based on the preliminary evolving data, in non-endemic countries, adult homosexual and bisexual men, and history of travel to non-endemic areas where outbreaks of MVI are being reported are at the greatest risks of acquiring MVI. Prompt and effective actions by public health authorities, clinicians, and the general population are recommended to prevent another possible pandemic. Further studies are required to better understand the epidemiology, infection sources, and transmissibility patterns of the recent outbreaks of MVI.KeywordsMonkeypox, smallpox,