cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multi-physics inverse homogenization for the design of innovative cellular materials: application to thermo-mechanical problems
Creators: name: Gavazzoni, Matteo
name: Ferro, Nicola
name: Perotto, Simona
name: Foletti, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: We present a new algorithm to design lightweight cellular materials with required properties in a multi-physics context. In particular, we focus on a thermo-mechanical setting, by promoting the design of unit cells characterized both by an isotropic and an anisotropic behaviour with respect to mechanical and thermal requirements. The proposed procedure generalizes microSIMPATY algorithm to a multi-physics framework, by preserving all the good properties of the reference design methodology. The resulting layouts exhibit non-standard topologies and are characterized by very sharp contours, thus limiting the post-processing before manufacturing. The new cellular materials are compared with the state-of-art in engineering practice in terms of thermo-mechanical properties, thus highlighting the good performance of the new layouts which, in some cases, outperform the consolidated choices.
An examination of the link between effective communications and satisfaction at work with reference to two organisations: a technical report on the production of ‘Making It Tick’
Creators: name: Bourne, Lionel E.
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 89999 Information and Computing Sciences not elsewhere classified
subject: FOS: Computer and information sciences

description: An examination of the link between effective communications and satisfaction at work with reference to two organisations: a technical report on the production of ‘Making It Tick’
Colonization of space. Ephemeral Megastructures for new city forms. Archigram case
Creators: name: Chierichetti, Nicolò
Publisher: name: figshare
Year: 2021
Subjects: subject: 120107 Landscape Architecture
subject: FOS: Civil engineering
subject: 120199 Architecture not elsewhere classified
subject: 120508 Urban Design
subject: FOS: Social and economic geography
subject: 120507 Urban Analysis and Development

description: The aim of the research is to discuss, within the framework of the Architectural Utopias of the 60s, the concept of Space colonization, declining it in the ephemeral use of megastructures. The main role given by the study to the English group Archigram wants to highlight how their experimental proposals are not so far from our reality and how their conceptual framework perfectly matches with the requirements. The rising of the idea of space colonization got a reserved spot in the scientific research since 1969, when the first human footprints were left on the lunar soil, and analyzing the current project proposals we can define some common points that we can highlight and confront with Archigram. The English group is given a role of absolute European centrality in the field of Utopian Megastructuralism, as their main concept ideas, were to break from the past in order to “invent and develop an ex-novo modern city, as huge tumultuous, agile and dynamic construction site in each of his part” and not less important, a vision of the city made of components, interchangeable and updatable where the dimension of time plays an important role given the indetermination and fluency in scientific and social evolution. The name itself is a representation of immediacy, as the group wanted an architecture that was important, urgent and rapid at the same time, like a telegram, from which the payoff “Archi(tecture...tele)gram”. One of Archigram’s accomplishments had been to reorient architecture toward changing social and ideological patterns. The innovation of Archigram stands also in reconsidering the urban fabric and the city from the inhabitants point of view and their conditions: the surrounding environment usually characterized by buildings in their physical mass (hardware) should be imagined as something flexible and upgradable, non-static (software) according to the users’ needs. And so is the un-explored field of living on new planets. The final question should be, Can Archigram proposals be the solutions for the colonization of new planets?
Population extinction in a fluctuating environment
Creators: name: Kamenev, Alex
name: Meerson, Baruch
name: Shklovskii, Boris
Publisher: name: arXiv
Year: 2008
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Environmental noise can cause an exponential reduction in the mean time to extinction (MTE) of an isolated population. We study this effect on an example of a stochastic birth-death process with rates modulated by a colored Gaussian noise. A path integral formulation yields a transparent way of evaluating the MTE and finding the optimal realization of the environmental noise that determines the most probable path to extinction. The population-size dependence of the MTE changes from exponential in the absence of the environmental noise to a power law for a short-correlated noise and to no dependence for long-correlated noise. We also establish the validity domains of the limits of white noise and adiabatic noise.
description: 4 pages, 3 figure
Towards a quantum notion of covariance in spherically symmetric loop quantum gravity
Creators: name: Gambini, Rodolfo
name: Olmedo, Javier
name: Pullin, Jorge
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The covariance of loop quantum gravity studies of spherically symmetric space-times has recently been questioned. This is a reasonable worry, given that they are formulated in terms of slicing-dependent variables. We show explicitly that the resulting space-times, obtained from Dirac observables of the quantum theory, are covariant in the usual sense of the way -- they preserve the quantum line element -- for any gauge that is stationary (in the exterior, if there is a horizon). The construction depends crucially on the details of the Abelianized quantization considered, the satisfaction of the quantum constraints and the recovery of standard general relativity in the classical limit and suggests that more informal polymerization constructions of possible semi-classical approximations to the theory can indeed have covariance problems. This analysis is based on the understanding of how slicing dependent quantities as the metric arise in a quantum context in terms of parameterized observables. It has implications beyond loop quantum gravity that hold for general approaches to quantum space time theories.
description: 8 pages, RevTex, no figures. To appear in Physical Review D
A computerized system for instruction in food selection practice
Creators: name: Prince, Peter Robert
Publisher: name: University of British Columbia
Year: 2010

description: This thesis has developed arprototypical system which provides information on dietary practices for those individuals interested in applying nutritional principles to their eating habits. The system has the potential to provide information which both accurately reflects nutritional guidelines and facilitates adoption of recommendations, by providing a self-explanatory statement of foods to consume and by limiting suggested changes in present food pattern. The prototypical computerized system developed has two major functions: (i), diet-assessment to appraise the acceptability of individual's dietary practices; and (ii), diet-planning to recommend modifications in the diets of those individuals not meeting specified limits. The focus of the system is a constrained-optimization algorithm that generates a revised food plan which both satisfies nutrient constraints, and minimizes the deviation of food items rand item groups from the original amount consumed by the client. Testing has been restricted to a descriptive evaluation of some of the algorithm's characteristics -- specifically, the design assumptions which define the acceptability of deviating from an original inventory, and the revised diets developed when these assumptions are modified. The results illustrate that altering these design assumptions produces marked variations in the revised diets with respect to observed parameters. Further modifications in the algorithm have been suggested. The explorative evaluation provides a foundation for more systematic evaluation of the validity of the algorithm. Recommendations for facilitating the further development and testing of the system are outlined. This thesis has shown that mathematical modeling provides an effective means of collating the vast amount of data required to develop cogent dietary recommendations which are nutritionally accurate, straightforward, and acceptable to the client.
Nuclear symmetry energy probed by neutron skin thickness of nuclei
Creators: name: Centelles, M.
name: Roca-Maza, X.
name: Vinas, X.
name: Warda, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We describe a relation between the symmetry energy coefficients c_sym(rho) of nuclear matter and a_sym(A) of finite nuclei that accommodates other correlations of nuclear properties with the low-density behavior of c_sym(rho). Here we take advantage of this relation to explore the prospects for constraining c_sym(rho) of systematic measurements of neutron skin sizes across the mass table, using as example present data from antiprotonic atoms. The found constraints from neutron skins are in harmony with the recent determinations from reactions and giant resonances.
description: 4 pages, 3 figures, changed content, to appear in Phys. Rev. Lett
Advancements in Power System Analysis Test Cases
Creators: T. Overbye
M. Papic
S. Miller
T. Van Cutsem
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
This panel is an update on test cases that have been developed for testing and confirming the operation of software being used for various power system analysis functions. Applications include distribution system analysis, reliability analysis, cascading failure modeling, and synthetic test systems.
Upgrading IEEE Standard 115 to Reflect New Testing Approaches and Emerging Sensing Technologies
Creators: H. Karmaker
E. Bortoni
S. Umans
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
IEEE Std 115-2019 is currently in its final drafting stage. It incorporates and updates virtually all contents of the 2009 edition. The panel will allow each chapter leader of the EMC-WG 115 to first recall the content of existing clause and then introduce the new ideas developed for adapting IEEE std 115-2009 to the new technology environment and changing needs of synchronous generators manufacturers, utilities and regulators. Giving the timeliness of the subject for the different stakeholders involved in grid modernization, full consideration will be given pert-unit system definition and to new techniques for cross-validation of machine parameters from different tests and analysis methods, including load rejection tests and frequency response tests. Application of the latest sensors technologies to provide new options to test engineers for improving the accuracy while reducing test duration will also be addressed by the panelists.
Online Centralized Charging Coordination of PEVs With Decentralized Var Discharging for Mitigation of Voltage Unbalance
Creators: Nasim Jabalameli
Xiangjing Su
and Arindam Ghosh
Publisher: name: IEEE
Year: 2019

This paper firstly investigates the impacts of uncoordinated single-phase PEV charging at residential houses on three-phase distribution networks. Then, it proposes a novel PEV charging coordination strategy based on heuristic genetic algorithm (GA) to perform online centralized charging considering transformer loading and bus voltage profiles.
The worldwide acceptance of plug-in electric vehicles (PEVs) is expected to tremendously grow in the next few years. Uncoordinated PEV charging can cause serious grid issues such as overloading of transformers and unacceptable voltage drops. Single-phase residential charging can also initiate or contribute to voltage unbalance in distribution networks. A potential solution for the PEV integration is shifting the charging activities from peak to valley periods. Therefore, this paper firstly investigates the impacts of uncoordinated single-phase PEV charging at residential houses on three-phase distribution networks. Then, it proposes a novel PEV charging coordination strategy based on heuristic genetic algorithm (GA) to perform online centralized charging considering transformer loading and bus voltage profiles. Based on this, a decentralized PEV reactive power discharging approach is presented where the reactive power is discharged at selected nodes for further reduction of voltage unbalance. The impacts of uncoordinated PEV charging as well as the performance of the proposed centralized PEV charging and decentralized var discharging strategies are tested on a real unbalanced Western Australian distribution network under the Perth Solar City project over 24 hours.
Fine-Grained Network Decomposition for Massively Parallel Electromagnetic Transient Simulation of Large Power Systems
Creators: zhiyin zhou
venkata dinavahi
Publisher: name: IEEE
Year: 2017

PETS-J Open Access Paper
This paper was written by Zhiyin Zhou and Venkata Dinavahi to investigate and report on Fine-Grained Network Decomposition for Massively Parallel Electromagnetic Transient Simulation of Large Power Systems.
Multi-Objectivizing Software Configuration Tuning (for a single performance concern)
Creators: name: Chen, Tao
name: Li, Miqing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Automatically tuning software configuration for optimizing a single performance attribute (e.g., minimizing latency) is not trivial, due to the nature of the configuration systems (e.g., complex landscape and expensive measurement). To deal with the problem, existing work has been focusing on developing various effective optimizers. However, a prominent issue that all these optimizers need to take care of is how to avoid the search being trapped in local optima -- a hard nut to crack for software configuration tuning due to its rugged and sparse landscape, and neighboring configurations tending to behave very differently. Overcoming such in an expensive measurement setting is even more challenging. In this paper, we take a different perspective to tackle this issue. Instead of focusing on improving the optimizer, we work on the level of optimization model. We do this by proposing a meta multi-objectivization model (MMO) that considers an auxiliary performance objective (e.g., throughput in addition to latency). What makes this model unique is that we do not optimize the auxiliary performance objective, but rather use it to make similarly-performing while different configurations less comparable (i.e. Pareto nondominated to each other), thus preventing the search from being trapped in local optima. Experiments on eight real-world software systems/environments with diverse performance attributes reveal that our MMO model is statistically more effective than state-of-the-art single-objective counterparts in overcoming local optima (up to 42% gain), while using as low as 24% of their measurements to achieve the same (or better) performance result.
description: 13 pages, 7 figures, 4 tables. In Proceedings of the 29th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE'21), 2021
Seamless Control of Solar PV Grid Interfaced System With Islanding Operation
Creators: Sunaina Singh
Seema Kewat
Bhim Singh
Bijaya Ketan Panigrahi
and Manoj Kumar Kushwaha
Publisher: name: IEEE
Year: 2019

This paper presents a robust control strategy for a solar photovoltaic (PV)-based distributed generation system (DGS) with seamless transition capabilities from islanded to the grid-connected mode and vice versa.
This paper presents a robust control strategy for a solar photovoltaic (PV)-based distributed generation system (DGS) with seamless transition capabilities from islanded to the grid-connected mode and vice versa. The proposed DGS consists of a solar PV array, a dc�dc boost converter, voltage source converter (VSC), and local nonlinear loads. In grid-connected mode, VSC regulates the dc-link voltage and the boost converter operates the solar PV array at the maximum power point. Moreover, the load reactive power compensation and harmonics elimination with unity power factor operation are achieved using the advanced robust shrinkage normalized sign (ARSNS)-based control algorithm. Therefore, the grid current distortion is maintained within the IEEE-519 standard and the IEEE-1547 standard. Under the grid fault condition, the proposed DGS operates in an islanded mode without any storage unit. The grid synchronization and resynchronization operations are executed through the intelligent synchronization control (SYC) algorithm with fast Fourier transform phase-locked loop (FFT-PLL). Test results demonstrate the system capabilities under the abnormal grid and unbalanced nonlinear load conditions.
A compact instrument for gamma-ray burst detection on a CubeSat platform I: Design drivers and expected performance
Creators: name: Murphy, David
name: Ulyanov, Alexey
name: McBreen, Sheila
name: Doyle, Maeve
name: Dunwoody, Rachel
name: Mangan, Joseph
name: Thompson, Joseph
name: Shortt, Brian
name: Martin-Carrillo, Antonio
name: Hanlon, Lorraine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Educational Irish Research Satellite 1 (EIRSAT-1) is a 2U CubeSat being developed under ESA's Fly Your Satellite! programme. The project has many aspects, which are primarily educational, but also include space qualification of new detector technologies for gamma-ray astronomy and the detection of gamma-ray bursts (GRBs). The Gamma-ray Module (GMOD), the main mission payload, is a small gamma-ray spectrometer comprising a 25 mm $\times$ 25 mm $\times$ 40 mm cerium bromide scintillator coupled to an array of 16 silicon photomultipliers. The readout is provided by IDE3380 (SIPHRA), a low-power and radiation tolerant readout ASIC. GMOD will detect gamma-rays and measure their energies in a range from tens of keV to a few MeV. Monte Carlo simulations were performed using the Medium Energy Gamma-ray Astronomy Library to evaluate GMOD's capability for the detection of GRBs in low Earth orbit. The simulations used a detailed mass model of the full spacecraft derived from a very high-fidelity 3D CAD model. The sky-average effective area of GMOD on board EIRSAT-1 was found to be 10 cm$^2$ at 120 keV. The instrument is expected to detect between 11 and 14 GRBs, at a significance greater than 10$σ$ (and up to 32 at 5$σ$), during a nominal one-year mission. The shape of the scintillator in GMOD results in omni-directional sensitivity which allows for a nearly all-sky field of view.
description: 27 pages, 13 figures. This is an author accepted manuscript of an article published in Experimental Astronomy. The final open-access version is available at: https://doi.org/10.1007/s10686-021-09779-9
Industrial Recommendation of Modeling of Inverter-Based Generators for Power System Dynamic Studies With Focus on Photovoltaic
Creators: Koji Yamashita
Herwig Renner
Sergio Martinez Villavnueva
Gustav Lammert
Petro Aristidou
Jose Carvalho Martins
Lingzhi Zhu
Luis David Pabon Ospina
Thierry Van Cutsem
Publisher: name: IEEE
Year: 2018

PES Open Access Paper
title: Front Matter, Table of Contents, Preface, Committees, List of Authors
Creators: name: Bertogna, Marko
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2017
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Committees
subject: List of Authors

description: Front Matter, Table of Contents, Preface, Committees, List of Authors
description: LIPIcs, Vol. 76, 29th Euromicro Conference on Real-Time Systems (ECRTS 2017), pages 0:i-0:xvi
Polarization Rotation, Switching and E-T phase diagrams of BaTiO$_3$: A Molecular Dynamics Study
Creators: name: Paul, Jaita
name: Nishimatsu, Takeshi
name: Kawazoe, Yoshiyuki
name: Waghmare, Umesh V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use molecular dynamics simulations to understand the mechanisms of polarization switching in ferroelectric BaTiO$_3$ achieved with external electric field. For tetragonal and orthorhombic ferroelectric phases, we determine the switching paths, and show that polarization rotation through intermediate monoclinic phases (a) facilitates switching at low fields (b) is responsible for a sharp anisotropy in polarization switching. We develop understanding of this through determination of detailed electric field-temperature phase diagrams, that are fundamental to technological applications based on electromechanical and switching response of ferroelectrics.
Adaptive Droop Control Method for Suppressing Circulating Currents in DC Microgrids
Creators: Niloofar Ghanbari and Subhashish Bhattacharya
Publisher: name: IEEE
Year: 2020

This paper proposes an adaptive droop control algorithm for suppressing circulating currents in a low voltage DC microgrid.
DC microgrids are introduced to reduce the conversion stages needed for connection of DC sources to the DC loads. They employ the droop control algorithm for managing the power flow from sources to the loads. However, the droop control functionality is affected by circuit parameters, especially line resistances. As a consequence, load sharing as the primary objective of the droop controller lacks accuracy. Parallel-connected converters have mismatched output voltages, resulting in circulating currents. This paper proposes an adaptive droop control algorithm for suppressing circulating currents in a low voltage DC microgrid. Line resistances are estimated through mathematical calculations and droop parameters are adjusted accordingly. Moreover, a distributed secondary controller is proposed to improve the load sharing accuracy and eliminate the effect of line resistances. The secondary controller shifts the droop controller voltage setpoint according to the converter current. Both of the proposed methods result in an accurate load sharing. Each of the participating converters has the rated current and consequently circulating current is suppressed. The effectiveness of the proposed method is verified through simulation and hardware-in-the-loop (HIL) setup.
A Data-Driven Justification for Dedicated Dynamic Pricing for Residences-Based Plug-in Electric Vehicles in Wind Energy-Rich Electricity Grids
Creators: Fathalla Eldali and Siddharth Suryanarayanan
Publisher: name: IEEE
Year: 2019

In this study, we use a data-driven approach to investigate an existing pricing mechanism for a city (Austin, Texas) in a wind energy-rich electricity grid (ERCOT) and with high projections of PEVs.
Supply curtailment in wind energy-rich electricity grids occurs when electric energy supply exceeds demand. Grid-level energy storage assets with the potential for storing the excess electric energy generated from wind are yet cost-prohibitive and prone to inefficiencies. An alternative for managing this excess energy is the targeted charging of available plug-in electric vehicles (PEVs). The different power requirements, load duration, and times of usage requires PEVs to be treated differently. Consequently, using a universal pricing mechanism may not lead to the maximum benefit for the utility and the consumers, especially when trying to rely on charging PEVs with wind energy. In this study, we use a data-driven approach to investigate an existing pricing mechanism for a city (Austin, Texas) in a wind energy-rich electricity grid (ERCOT) and with high projections of PEVs. The study provides a general framework for the wind energy-rich utilities to better evaluate their profitability and the benefits of the consumers. In our case study, the results indicate the need for an alternative pricing mechanism (e.g., time-of-use) dedicated to PEVs than the existing choices for maximizing the utility of available energy from wind in the absence of grid-level energy storage.
Neutral Solar Wind Generated by Lunar Exospheric Dust at the Terminator
Creators: name: Collier, Michael R.
name: Stubbs, Timothy J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We calculate the flux of neutral solar wind observed on the lunar surface at the terminator due to solar wind protons penetrating exospheric dust grains with (1) radii greater than 0.1 microns and (2) radii greater than 0.01 microns. For grains with radii larger than 0.1 microns, the ratio of the neutral solar wind flux produced by exospheric dust to the incident ionized solar wind flux is estimated to be about 10^-4-10^-3 for solar wind speeds in excess of 800 km/s, but much lower (less than 10^-5) at average to slow solar wind speeds. However, when the smaller grain sizes are considered, this ratio is estimated to be greater than 10^-5 at all speeds, and at speeds in excess of 700 km/s reaches about 10^-3. These neutral solar wind fluxes are easily measurable with current low energy neutral atom instrumentation. Observations of neutral solar wind from the surface of the Moon would provide independent information on the distribution of very small dust grains in the lunar exosphere that would complement and constrain optical measurements at ultraviolet and visible wavelengths.
description: in press in J. Geophys. Res
Visualizing the Impacts of Renewable Energy Growth in the U.S. Midcontinent
Creators: Armando L. Figueroa-Acevedo
Chen-Hao Tsai
Kenny Gruchalla
Zaran Claes
Shannon Foley
Jordan Bakke
James Okullo
and Aditya Jayam Prabhakar
Publisher: name: IEEE
Year: 2020

This paper presents the visualization approach for enhancing analyses of the ongoing Renewable Integration Impact Assessment by the Midcontinent Independent System Operator.
This paper presents the visualization approach for enhancing analyses of the ongoing Renewable Integration Impact (RIIA) Assessment by the Midcontinent Independent System Operator (MISO), and brings the following contributions. First, this paper details the customization of state-of-the-art, open-source visualization code to complement existing power system visualization tools and data analytic processes used in MISO. Second, this paper describes how MISO integrates this visualization tool within a novel and holistic process for studying renewable integration issues. This visualization tool provides additional insights for RIIA from multiple aspects with fine spatial-temporal granularity, including the comparison of thermal generation performance at different renewable integration scenarios, improved understanding of complex interactions between regions within MISO, the effects of transmission upgrades on curtailment reduction using optimization techniques, and the improved verification of MISO's simulation results. Lastly, we make the updated visualization code package publicly available.
C-V2X network slicing framework for 5G-enabled vehicle platooning applications
Creators: name: Lekidis, Alexios
name: Bouali, Faouzi
Publisher: name: figshare
Year: 2021
Subjects: subject: 90299 Automotive Engineering not elsewhere classified
subject: FOS: Mechanical engineering
subject: Computer Engineering
subject: 100503 Computer Communications Networks
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The fifth generation (5G) of mobile networks is steering the technological evolution of many application domains, including many demanding automotive scenarios, such as platooning. Such evolution combines softwarization enablers (e.g., Network Function Virtualization (NFV) and Software-Defined Networking (SDN)) with Cellular Vehicle-to-Everything (C-V2X) communication to form end-to-end network slices with 5G infrastructure resources. Unlike the currently used 802.11p standard, the adoption of these technologies would support ultra-reliable low-latency communication (URLLC) between the platoon members and would offer better network coverage, which in turn would allow faster remote monitoring and operation of the entire platoons. In this paper, we present a novel C-V2X network slicing framework for platooning applications. The proposed framework includes a library of C-V2X Virtual Network Functions (VNFs) that can be used to customize network slices spanning over the entire 5G infrastructure. The implementation also includes edge computing functions to provide further latencyand performance improvements as well as network security functions to provide cyber-resilience for the platoon. We have conducted implementation tests on a real 5G infrastructure forming a truck platoon in an automotive campus. The results demonstrate the support of URLLC on the C-V2X connectivity between trucks, which opens new horizons towards the adoption of C-V2X network slices in future platooning applications.
A Benchmark Distribution System for Investigation of Residential Microgrids With Multiple Local Generation and Storage Devices
Creators: Syed A. Raza and Jin Jiang
Publisher: name: IEEE
Year: 2019

A benchmark distribution system is developed for investigating control and energy management of distributed generation at a residential level in the form of three single-phase microgrids.
A benchmark distribution system is developed for investigating control and energy management of distributed generation (DG) at a residential level in the form of three single-phase microgrids. The benchmark is derived from a typical distribution network architecture with common parameters found in North-America systems including wiring specifications, line impedances and connection details for rooftop PV systems. This benchmark system can accommodate microgrids operating in both grid-connected and islanded modes.Within this benchmark, multiple single-phase DG sources located in different phases can be coordinated to form a dynamically balanced three phase system under different load and generation profiles in different phases. The coordination of DG sources in a particular phase is achieved through an intra-phase power management device, while mitigating loads and generation imbalance among all phases are done by an inter-phase power management scheme. It is expected that this benchmark system will facilitate investigation of impacts posed by proliferation of single-phase distributed generation devices and local storage systems in private residences. Three case studies have been carried out to demonstrate the versatility and effectiveness of this benchmark system.
Exploring the phase diagram of sextet QCD
Creators: name: DeGrand, Thomas
name: Shamir, Yigal
name: Svetitsky, Benjamin
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: As a follow up to the previous talk about the beta function of SU(3) gauge theory with Nf=2 symmetric representation (clover) fermions [arXiv:0809.2885 [hep-lat]], we describe our explorations of the beta-kappa plane, away from the massless limit. Our simulations are mostly done on lattices of length L=8 and 12. We observe a phase transition from a strong coupling confined phase to a deconfined, chirally restored phase. The line of transitions avoids (so far) the location of the infrared fixed point discussed in the last talk.
description: 7 pages, 4 figures, contribution to XXVI International Symposium on Lattice Field Theory, Williamsburg VA USA, July 2008
Detecting automorphic orbits in free groups
Creators: name: Brinkmann, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 37E30

description: We present an effective algorithm for detecting automorphic orbits in free groups, as well as a number of algorithmic improvements of train tracks for free group automorphisms.
description: 24 pages, 2 figures
Diagnosing space telescope misalignment and jitter using stellar images
Creators: name: Ma, Zhaoming
name: Bernstein, Gary
name: Weinstein, Alan
name: Sholl, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Accurate knowledge of the telescope's point spread function (PSF) is essential for the weak gravitational lensing measurements that hold great promise for cosmological constraints. For space telescopes, the PSF may vary with time due to thermal drifts in the telescope structure, and/or due to jitter in the spacecraft pointing (ground-based telescopes have additional sources of variation). We describe and simulate a procedure for using the images of the stars in each exposure to determine the misalignment and jitter parameters, and reconstruct the PSF at any point in that exposure's field of view. The simulation uses the design of the SNAP (http://snap.lbl.gov) telescope. Stellar-image data in a typical exposure determines secondary-mirror positions as precisely as $20 {\rm nm}$. The PSF ellipticities and size, which are the quantities of interest for weak lensing are determined to $4.0 \times 10^{-4}$ and $2.2 \times 10^{-4}$ accuracies respectively in each exposure, sufficient to meet weak-lensing requirements. We show that, for the case of a space telescope, the PSF estimation errors scale inversely with the square root of the total number of photons collected from all the usable stars in the exposure.
description: 20 pages, 6 figs, submitted to PASP
MATLAB-Based Programs for Power System Dynamic Analysis
Creators: Ismael Abdulrahman
Publisher: name: IEEE
Year: 2019

This paper presents MATLAB-based programs developed for power system dynamic analysis.
This paper presents MATLAB-based programs developed for power system dynamic analysis. The programs can be used for educational purposes and research studies. With the program, time-domain simulation, system linearization, modal analysis, participation factor analysis and visualization, optimal placement of controller, feedback signal selection, frequency response analysis, and control design can be obtained. In addition to solving a power system problem, the package provides a symbolic and vectorized representation of the model in time domain and state space. The package uses the full advantages of MATLAB's powerful solvers for solving non-stiff and stiff problems. Both explicit and implicit techniques are used for solving the differential algebraic equations (DAEs). The synchronous machines are assumed to be equipped with exciter, turbine, and stabilizer. The loads can be modeled as voltage-dependent and independent loads. The test systems used in this paper are the IEEE 9-bus and 68-bus systems, and Texas's 2007-bus synthetic power system. Different types of disturbances are applied to the systems including generator-side and network-side disturbances. The results demonstrate the efficiency and educational values of the package for researchers and students.
Negative thermal expansion and itinerant ferromagnetism in Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$
Creators: name: Singh, Vikram
name: Nath, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the thermal expansion, critical behavior, magnetocaloric effect (MCE), and magnetoresistance ($MR$) on the polycrystalline Mn$_{1.4}$Fe$_{3.6}$Si$_{3}$ compound around the ferromagnetic transition. A large negative volume thermal expansion ($α_{\rm V}\sim -20 \times 10^{-6}$ K$^{-1}$) is observed across the transition temperature with a strong anisotropic variation of lattice parameters in the $ab$-plane. The anisotropic magnetoelasticity arises from the competition between magnetic ordering and structural deformation which could be responsible for the large MCE ($ΔS_{\rm m} \simeq -6$ J/Kg-K) across the magnetic transition in this compound. The large and negative $MR$ ($\sim -3\%$ in 80 kOe) is also observed at the transition temperature which can be attributed to the suppression of spin disorder. Further, the Rhodes-Wolfarth ratio (RWR $> 1$) and identical field dependence of $MR$ and MCE isotherms indicate the itinerant character of the $3d$ electrons. The critical exponents determined from the analysis of magnetization and MCE are consistent with the quasi-two-dimensional (2D) Ising model with long range exchange interactions which decays as $J(r)\sim r^{-3.41}$. This unconventional quasi-2D Ising character with long-range interactions can be ascribed to strong $ab$-plane anisotropy and the delocalized $3d$ electrons in the studied compound.
description: 9 pages, 8 figures, 1 table, J. Appl. Phys. (Accepted)
C-V2X-network-slicing-framework-for-5G-enabled-vehicle-platooning-applications.pdf
Creators: name: Lekidis, Alexios
name: Bouali, Faouzi
Publisher: name: figshare
Year: 2021
Subjects: subject: 90299 Automotive Engineering not elsewhere classified
subject: FOS: Mechanical engineering
subject: Computer Engineering
subject: 100503 Computer Communications Networks
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The fifth generation (5G) of mobile networks is steering the technological evolution of many application domains, including many demanding automotive scenarios, such as platooning. Such evolution combines softwarization enablers (e.g., Network Function Virtualization (NFV) and Software-Defined Networking (SDN)) with Cellular Vehicle-to-Everything (C-V2X) communication to form end-to-end network slices with 5G infrastructure resources. Unlike the currently used 802.11p standard, the adoption of these technologies would support ultra-reliable low-latency communication (URLLC) between the platoon members and would offer better network coverage, which in turn would allow faster remote monitoring and operation of the entire platoons. In this paper, we present a novel C-V2X network slicing framework for platooning applications. The proposed framework includes a library of C-V2X Virtual Network Functions (VNFs) that can be used to customize network slices spanning over the entire 5G infrastructure. The implementation also includes edge computing functions to provide further latencyand performance improvements as well as network security functions to provide cyber-resilience for the platoon. We have conducted implementation tests on a real 5G infrastructure forming a truck platoon in an automotive campus. The results demonstrate the support of URLLC on the C-V2X connectivity between trucks, which opens new horizons towards the adoption of C-V2X network slices in future platooning applications.
Optimal Scheduling of Merchant-Owned Energy Storage Systems With Multiple Ancillary Services
Creators: C. Opathella
Ayman Elkasrawy
Amr A. Mohamed
and B. Venkatesh
Publisher: name: IEEE
Year: 2019

This paper proposes a new linear profit-maximizing formulation for grid-connected merchant-owned energy storage systems operating with multiple ancillary services.
Electrical energy storage (EES) can improve the flexibility and reliability of electric power systems. At the same time, they can supply different ancillary services. The profit of the energy storage operation can be maximized by deciding the best level of each service. Merchant-owned facilities require a profit-maximizing formulation for grid-connected energy storage systems with multiple ancillary services. This paper proposes a new linear profit-maximizing formulation for grid-connected merchant-owned energy storage systems operating with multiple ancillary services. All technical characteristics of EES have been modelled, including cycle life loss due to fast charge/discharge and low depth of discharge operations. A piece-wise linear model of an EES converter's capability curve has also been included for reactive power modeling. The model was assessed considering a battery EES, a flywheel EES, and a compressed air EES, with the results demonstrating the benefits of the formulation. From case studies, it is clear that the merchant-owned battery EES and the flywheel EES can generate profits, especially from voltage regulation and frequency regulation services. The case studies prove that the proposed model can be used as an optimal planning and operation tool for any type or size of EES.
Multi-wavelength observations of jets at high and low X-ray luminosities
Creators: name: Gallo, Elena
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I shall briefly review the observational properties of radio-emitting jets from Galactic X-ray binaries in relation with other wavebands: infrared, optical and X-ray. Special attention is paid to recent results obtained with the Spitzer Space Telescope on quiescent black holes as well as ultra-compact neutron star X-ray binaries
description: Proceedings of "A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments", 28 Oct. - 2 Nov. 2007, St. Petersburg Beach, FL (R.M. Bandyopadhyay, S. Wachter, D. Gelino, & C.R. Gelino, eds.)
A Generic EMT-Type Model for Wind Parks With Permanent Magnet Synchronous Generator Full Size Converter Wind Turbines
Creators: U. Karaagac
J. Mahseredjian
R. Gagnon
H. Gras
H. Saad
L. Cai
I. Kocar
A. Haddadi
E. Farantatos
S. Bu
K. W. Chan
and L. Wang
Publisher: name: IEEE
Year: 2019

This paper presents an electromagnetic transient (EMT) simulation model for full-size converter (FSC) WT-based WPs that can be used for stability analysis and interconnection studies.
Utilities are under considerable pressure to increase the share of wind energy resources in their generation fleet. With the increasing share of wind energy resources, the dynamic behavior of power systems will change considerably due to fundamental differences in technologies used for wind and conventional generators. There is a very little standardization in the ways to model wind turbines (WTs) and wind parks (WPs) in sharp contrast to conventional power plants. Hence, there is an international interest to deliver generic models (i.e. standardized and publicly available) for WTs and WPs that are able to capture all performance aspects as good as manufacturer-specific models. This paper presents an electromagnetic transient (EMT) simulation model for full-size converter (FSC) WT-based WPs that can be used for stability analysis and interconnection studies. The considered topology uses a permanent magnet synchronous generator. Although the collector grid and the FSC WTs are represented with their aggregated models, the overall control structure of the WP is preserved. FSC WT and WP control systems include the non-linearities, and necessary transient and protection functions to simulate the accurate transient behavior of WPs.
Volnet UK: an investigation into its role in the community and voluntary sector
Creators: name: Marie-Laure Bouchet
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 89999 Information and Computing Sciences not elsewhere classified
subject: FOS: Computer and information sciences

description: Volnet UK: an investigation into its role in the community and voluntary sector
Are superparamagnetic spins classical?
Creators: name: Garanin, D. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Effective giant spins of magnetic nanoparticles are considered classically in the conventional theory of superparamagnetism based on the Landau-Lifshitz-Langevin equation. However, microscopic calculations for a large spin with uniaxial anisotropy, coupled to the lattice via the simplest generic mechanism, show that the results of the conventional theory are not reproduced in the limit S ->\infty. In particular, the prefactor Gamma_0 in the Arrhenius escape rate over the barrier Gamma =Gamma_0 exp[-Delta U/(k_B T)] has an anomalously large sensitivity to symmetry-breaking interactions such as transverse field
description: 6 EPL pages, 3 figure captions
Hair: a tool to evaluate the HPA axis activity
Creators: name: Peric, Tanja <1982>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: VET/02 Fisiologia veterinaria

description: Hair cortisol is a novel marker to measure long-term secretion cortisol free from many methodological caveats associated with other matrices such as plasma, saliva, urine, milk and faeces. For decades hair analysis has been successfully used in forensic science and toxicology to evaluate the exposure to exogenous substances and assess endogenous steroid hormones. Evaluation of cortisol in hair matrix began about a decade ago and have over the past five years had a remarkable development by advancing knowledge and affirming this method as a new and efficient way to study the hypothalamic-pituitary-adrenal (HPA) axis activity over a long time period. In farm animals, certain environmental or management conditions can potentially activate the HPA axis. Given the importance of cortisol in monitoring the HPA axis activity, a first approach has involved the study on the distribution of hair cortisol concentrations (HCC) in healthy dairy cows showing a physiological range of variation of this hormone. Moreover, HCC have been significantly influenced also by changes in environmental conditions and a significant positive correlation was detected between HCC and cows clinically or physiologically compromised suggesting that these cows were subjected to repeated HPA axis activation. Additionally, Crossbreed F1 heifers showed significantly lower HCC compared to pure animals and a breed influence has been seen also on the HPA axis activity stimulated by an environmental change showing thus a higher level of resilience and a better adaptability to the environment of certain genotypes. Hair proved to be an excellent matrix also in the study of the activation of the HPA axis during the perinatal period. The use of hair analysis in research holds great promise to significantly enhance current understanding on the role of HPA axis over a long period of time.
Small-Signal Stability Analysis of the Interactions Between Voltage Source Converters and DC Current Flow Controllers
Creators: Rui Guan
Na Deng
Ying Xue
and Xiao-Ping Zhang
Publisher: name: IEEE
Year: 2019

In this paper, an integrated small-signal model is established to investigate the interactions between VSC and DC current  flow controllers.
Small-signal stability analysis of the voltage source converter (VSC) based multi-terminal DC (MTDC) grids has been mainly focused on the dynamics of AC/DC converters while there is a lack of consideration of DC networks with DC power-flow controllers. In this paper, an integrated small-signal model is established to investigate the interactions between VSC and DC current flow controllers (CFC). The impacts of the control system of CFC on small-signal stability of the integrated system and the impacts of the control system of VSC on the DC networks with CFC are discussed via eigenvalue analysis. The above interactions are demonstrated through dynamic simulations against both small and large disturbances using real time digital simulator (RTDS).