cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Factors affecting the adoption of technologies applied to the fashion sector
Creators: name: Borba, Eduardo Henrique de
name: Tezza, Rafael
Publisher: name: figshare
Year: 2021
Subjects: subject: 150499 Commercial Services not elsewhere classified
subject: FOS: Economics and business
subject: 159999 Commerce, Management, Tourism and Services not elsewhere classified

description: ABSTRACT: The Unified Theory of Acceptance and Use of Technology (UTAUT) is widely used to assess the precursors to technology adoption. And, in the Brazilian technological context, e-commerce aimed at the fashion sector is widely used and profitable. Therefore, this article presents a systematic literature search on the factors that impact the adoption of Information and Communication Technologies (ICTs) specifically aimed at fashion, highlighting dimensions exogenous to UTAUT. The review follows a deductive reasoning, based on the reviewed bibliographies. The results, from the Ebsco, Scopus and Web of Science databases, are evaluated, using a descriptive quantitative analysis, followed by a qualitative assessment of the emerging exogenous dimensions. 17 dimensions exogenous to the UTAUT model were highlighted, in 6 main themes of the online fashion sector. The analysis of the articles evidenced the need to insert new dimensions in the models that evolve, specifying better elucidate the adoption of each technology studied.
Slides for: Lens-Free On-Chip Digital Holographic Microscopy: Resolution Analysis andSystem Design
Creators: Dr. Chao Zuo
Publisher: name: IEEE
Year: 2023

Slides for: SPS Webinar, 7 April 2023, Dr. Chao Zuo.
Lens-free on-chip digital holographic microscopy (LFOCDHM) is a computational imaging technique whereby the sample is placed directly onto or very close to the digital sensor and illuminated by a partially coherent source located far above it. However, unlike conventional coherent diffraction-limited imaging systems, where the limiting aperture is used to define the system performance, typical lens-free microscopes only produce compromised imaging resolution that are far below the ideal coherent diffraction limit. In this presentation, we analyze 5 major factors that may contribute to this limitation, namely, the sample-to-sensor distance, spatial and temporal coherence of the illumination, finite size of the equally spaced sensor pixels, and finite extent of the image sub-FOV used for the reconstruction. We will also discuss how to build an LFOCDHM system by optimizing these relevant parameters, achieving both high-resolution and wide field-of-view microscopic imaging with a miniaturized platform.
Fasergrobaufschluss bei Hanf
Creators: name: Fürll, Christian
name: Hempel, Heinz
name: Baldauf, Horst
Publisher: name: LANDTECHNIK
Year: 1998

description: Hanffasern können für die Herstellung von Dämmstoffen, Baustoffen oder Verbundmaterialien verwendet werden. Denkbar ist sogar der Ersatz von Glas oder Kohlefasern. Voraussetzung ist aber eine wirtschaftliche Konkurrenzfähigkeit. Die in der Praxis befindlichen Anlagen zum Fasergrobaufschluss sind noch mit zu hohen Kosten verbunden. Deshalb wurden erste Untersuchungen zur Fasergewinnung aus trockenem Grünhanf mithilfe von Zerkleinerungsmaschinen durchgeführt. Modifizierte Hammermühlen sind geeignet, die Fasern freizulegen. Technisch möglich ist auch die Fasergewinnung aus siliertem oder konserviertem Hanf.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Relaxation dynamics of two interacting electrical double-layers in a 1D Coulomb system
Creators: name: Varela, Lucas
name: Andraus, Sergio
name: Trizac, Emmanuel
name: Téllez, Gabriel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider an out-of-equilibrium one-dimensional model for two electrical double-layers. With a combination of exact calculations and Brownian Dynamics simulations, we compute the relaxation time ($τ$) for an electroneutral salt-free suspension, made up of two fixed colloids, with $N$ neutralizing mobile counterions. For $N$ odd, the two double-layers never decouple, irrespective of their separation $L$; this is the regime of like-charge attraction, where $τ$ exhibits a diffusive scaling in $L^2$ for large $L$. On the other hand, for even $N$, $L$ no longer is the relevant length scale for setting the relaxation time; this role is played by the Bjerrum length. This leads to distinctly different dynamics: for $N$ even, thermal effects are detrimental to relaxation, increasing $τ$, while they accelerate relaxation for $N$ odd. Finally, we also show that the mean-field theory is recovered for large $N$ and moreover, that it remains an operational treatment down to relatively small values of $N$ ($N>3$).
Wärmedämmstoff aus Rohrkolben
Creators: name: Batschkus, Verena
name: Englert, Gerhard
name: Schön, Hans
Publisher: name: LANDTECHNIK
Year: 1998

description: Laborversuche haben gezeigt, dass aus dem Röhrichtgewächs Rohrkolben hergestelltes Schüttgut eine Wärmeleitfähigkeit von 0,035 bis 0,045 W/mK aufweist. Dieser Wert wird maßgeblich von der Schüttdichte beeinflusst. Die Kosten der Herstellung liegen zwischen 40 DM/m3 für eine Wärmeleitfähigkeit von 0,045W/mK und 80 DM/m3 für 0,035 W/mK mit stark steigender Tendenz bei weiterer Reduzierung der Wärmeleitfähigkeit. Der Energieaufwand zur Verarbeitung des Rohmaterials zur fertige Dämmschichtliegt mit etwa 1 5 MJ/m3 im Vergleich zu anderen Wärmedämmstoffen niedrig.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Angular dependence of the radiation power of a Josephson STAR-emitter
Creators: name: Klemm, Richard A.
name: Kadowaki, Kazuo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We calculate the angular dependence of the power of stimulated terahertz amplified radiation (STAR) emitted from a $dc$ voltage applied across a stack of intrinsic Josephson junctions. During coherent emission, we assume a spatially uniform $ac$ Josephson current density in the stack acts as a surface electric current density antenna source, and the cavity features of the stack are contained in a magnetic surface current density source. A superconducting substrate acts as a perfect magnetic conductor with $H_{||,ac}=0$ on its surface. The combined results agree very well with recent experimental observations. Existing Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ crystals atop perfect electric conductors could have Josephson STAR-emitter power in excess of 5 mW, acceptable for many device applications.
description: 3 pages 3 figures
Exaktstreuer für Bioabfallkompost
Creators: name: Stieg, Detlef
name: Wagner, Gunther
name: Krause, Rüdiger
Publisher: name: LANDTECHNIK
Year: 1998

description: Den steigenden Anforderungen an die Verteil- und Dosiergenauigkeit von Ausbringsystemen für leichten Bioabfallkompost soll durch die Entwicklung eines entsprechenden Systems Rechnung getragen werden. Hierzu werden an Auslegern geführte Drehteller mit kurzen Wurfbahnen verwendet. Des Weiteren werden zur Bewältigung der Teilfunktionen Dosieren und Transportieren separate Teilsysteme auf der Basis von Schneckenförderern eingesetzt.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Understanding spatial propagation using metric geometry with application to the spread of COVID-19 in the United States
Creators: name: James, Nick
name: Menzies, Max
name: Bondell, Howard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: This paper introduces a novel approach to spatio-temporal data analysis using metric geometry to study the propagation of COVID-19 across the United States. Using a geodesic Wasserstein metric, we analyse discrepancies between the density functions of new case counts on any given day, incorporating the geographic spread of cases. First, we apply this to identify the periods during which the changes in the geographic distribution of COVID-19 were most profound. The greatest shift occurred between May and June of 2020, when COVID-19 shifted from mostly dominating the Northeastern states to a wider distribution across the country. We support our findings with a new measure of the extent of geodesic variance of a distribution, demonstrating that the geographic imprint of COVID-19 was most concentrated in May 2020. Next, we investigate whether the epidemic exhibited meaningful patterns of spatial reversion, where similar geographic distributions return later. We identify broad similarity between the spread of COVID-19 across the US between the second and third waves, and to a lesser extent, the reemergence of the first wave's Northeastern dominance closer to the present day. This methodology could provide new insights for analysts to monitor the dynamical spread of epidemics and enable regional policymakers to protect their localities. More broadly, the framework we introduce could be applied to a variety of problems evolving over space and time.
description: Equal contribution from first two authors
Slides for: Quality Assessment for Omnidirectional Video/Images: Spatio-Temporal Distortion Modeling and a Deep Learning Solution
Creators: Dr. Pan Gao
Dr. Aljosa Smolic
Publisher: name: IEEE
Year: 2023

Slides for: SPS Webinar, 12 April 2023, Dr. Pan Gao, Dr. Aljosa Smolic.
Omnidirectional video, also known as 360-degree video, has become increasingly popular nowadays due to its ability to provide immersive and interactive visual experiences. However, the ultra-high resolution and the spherical observation space brought by the large spherical viewing range make omnidirectional video distinctly different from traditional 2D video. To date, video quality assessment (VQA) for omnidirectional video is still an open issue.

This talk contains two parts. The first part introduces a spatio�temporal modeling approach. In this approach, we firstly construct a spatio�temporal quality assessment unit to evaluate the average distortion in temporal dimension at the eye fixation level. Then, we give a detailed solution of how to integrate three existing spatial VQA metrics into this approach. Besides, cross-format omnidirectional video distortion measurement is also discussed. Based on the modeling approach, a full reference objective quality assessment metric for omnidirectional video is derived, namely OV-PSNR. Experimental results show that OV-PSNR greatly improves the prediction performance of existing VQA metrics for omnidirectional video.

The second part of this talk will introduce our attempt to using deep learning for blind omnidirectional image quality assessment. We will first talk about the challenges currently faced in this filed, and then provide the details about our proposed model BOIQA. Our model contains two-stage training: one is to pre-train the model to obtain an objective error map with reference image, and the other one is to train the model to predict the score with the inferenced objective error map, where we employ a spatial weight map as a prior to predict human sensitivity. Finally, we show the performance of our BOIQA on the datasets CVIQ and OIQA.
Eingriff und Ausgleich landwirtschaftlicher Flächen
Creators: name: Kühlbach, Karsten
Publisher: name: LANDTECHNIK
Year: 1997

description: Im Rahmen eines Modellvorhabens wird versucht, für den Bereich des Stadtverbandes Saarbrücken die zur weiteren Entwicklung der verbleibenden landwirtschaftlichen Betriebe notwendigen Flächen vor betriebsgefährdenden Eingriffen anderer Nutzungsansprüche zu sichern. Dies soll mit dem Instrument Landschaftsplan und der begleitenden Betriebsentwicklungsplanung erreicht werden.
description: LANDTECHNIK, Bd. 52 Nr. 6 (1997)
Technische Regelwerke in der Europäischen Union
Creators: name: Alt, Norbert
Publisher: name: LANDTECHNIK
Year: 1997

description: Der Begriff Zertifizierung ist heute aus dem täglichen Sprachgebrauch nicht mehr wegzudenken. Insbesondere seit Veröffentlichung der internationalen Normenreihe ISO 9000 über Qualitätsmanagementsysteme und dem in Kraft treten der EG-Richtlinie Maschinen wird dieses Schlagwort in den verschiedensten Zusammenhängen und Kombinationen benutzt – und sehr häufig missverstanden. Mit dem letzten Beitrag zu dieser Artikelserie werden die einzelnen Zertifizierungsverfahren erläutert und bewertet.
description: LANDTECHNIK, Bd. 52 Nr. 6 (1997)
Splines, differential equations and optimal smoothing
Creators: name: Frasso, Gianluca
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: In many scientific areas it is of primary interest to describe the dynamics of a system, that is, how it evolves over time and/or space. In the simple one-dimensional case the state of a system at any time can be represented by a function u(t) which' values track the evolution of a given phenomenon over time. It is also possible to consider phenomena evolving in time and space by using a function u(t,x) depending on two independent variables.
Thus knowing t and/or x it is possible to evaluate the state of the system at at a given point in space and/or time. One way to obtain u(.) is taking measurements at different values of the independent variable(s) and fit the data in order to estimate a formula for u. This is the point of view exploited in statistical data analysis. Overparametric regression (smoothing) techniques are usually applied in this kind of studies.

On the other hand it is clear that such a model would tell us how the system evolves but is not able to clarify why the system behaves as has been observed. Therefore we try to formulate mathematical models summarizing the understanding we seek. Often these models are dynamic equations that relate the state function to one or more of its derivatives w.r.t. the independent variable(s). Such equations are called differential equations (or abbreviated as DE). Differential equations are common analytic tools in physics and engineering.
The first approach we have cited has the advantage to make the description of an observed phenomenon really flexible, being able to exploit all the information provided by the observed measurements. It becomes clear if we consider the applicability of overparametric smoothing techniques. These approaches, by the way, do not allow for a physical interpretation of the observed dynamics. On the other hand, the main advantage of a differential modeling point of view is to highlight the physical determinants of a given phenomenon but completely ignore what has been observed.
The aim of this work is to present a flexible way to combine the statistical and the dynamic modeling points of view. To reach this goal we combine in a convenient way the flexible data description provided by a semi-parametric regression analysis and the physical interpretability of dynamics summarized by differential equations.
Bauen im Außenbereich
Creators: name: Schliepkorte, Jörg
Publisher: name: LANDTECHNIK
Year: 1998

description: Das Gesetz zur Änderung des Baugesetzbuchs und zur Neuregelung des Rechts der Raumordnung (BauROG) [1] trat zum 1 Januar 1998 in Kraft. Damit wurde das Städtebaurecht (BauGB) [2] in wesentlichen Punkten geändert. Die Neuregelung des Bauplanungsrechts ist gekennzeichnet durch den Abbau von Vorschriften, Rechtsvereinheitlichung, der Integration des Umweltschutzes in das Baugesetzbuch und Erleichterungen, die den Strukturwandel in der Landwirtschaft begleiten.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Determinants related to Dirichlet characters modulo 2, 4 and 8 of binomial coefficients and the algebra of recurrence matrices
Creators: name: Bacher, Roland
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 05A10,05A30,11B65,11B85,15-99

description: Using recurrence matrices, defined and described with some details, we study a few determinants related to evaluations of binomial coefficients on Dirichlet characters modulo 2, 4 and 8.
description: Final version, to appear in International Journal of Algebra and Computation
Methods for Analysis and Quantification of Power System Resilience (TR 108)
Creators: Alex M. Stankovic
Kevin L. Tomsovic
Fabrizio De Caro
Martin Braun
Joe H. Chow
Ninel ?ukalevski
Ian Dobson
Joe Eto
Blair Fink
Christian Hachmann
David Hill
Chuanyi Ji
James A. Kavicky
Victor Levi
Chen-Ching Liu
Lamine Mili
Rodrigo Moreno
Mathaios Panteli
Frederic D. Petit
Giovanni Sansavini
Chanan Singh
Anurag K. Srivastava
Kai Strunz
Hongbo Sun
Yin Xu
Shijia Zhao
Publisher: name: IEEE
Year: 2023

This report summarizes the work of the IEEE PES Task Force sponsored by the PSDS and AMPS committees. Resilience is a relatively new technical concept for power systems, and it is essential to precisely delineate this concept for actual applications. As a critical infrastructure, power systems have to be prepared to survive rare but extreme incidents (natural catastrophes, extreme weather events, physical/cyber-attacks, equipment failure cascades, etc.) to guarantee power supply to the increasingly electricity-dependent economy and society. Thus, resilience must be integrated into planning and operational assessment to design and operate adequately resilient power systems. Quantification of resilience as a key performance indicator is valuable, together with costs and reliability. Quantification can evaluate existing power systems and identify resilience improvements in future power systems. Given that a 100% resilient system is not economic (or even technically achievable), the degree of resilience should be transparent and comprehensible. Several gaps are identified to indicate further needs for research and development.
This report summarizes the work of the IEEE PES Task Force sponsored by the PSDS and AMPS committees. Resilience is a relatively new technical concept for power systems, and it is essential to precisely delineate this concept for actual applications. As a critical infrastructure, power systems have to be prepared to survive rare but extreme incidents (natural catastrophes, extreme weather events, physical/cyber-attacks, equipment failure cascades, etc.) to guarantee power supply to the increasingly electricity-dependent economy and society. Thus, resilience must be integrated into planning and operational assessment to design and operate adequately resilient power systems. Quantification of resilience as a key performance indicator is valuable, together with costs and reliability. Quantification can evaluate existing power systems and identify resilience improvements in future power systems. Given that a 100% resilient system is not economic (or even technically achievable), the degree of resilience should be transparent and comprehensible. Several gaps are identified to indicate further needs for research and development.
Manipulation and Generation of Supercurrent in Out-of-Equilibrium Josephson Tunnel Nanojunctions
Creators: name: Tirelli, S.
name: Savin, A. M.
name: Garcia, C. Pascual
name: Pekola, J. P.
name: Beltram, F.
name: Giazotto, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We demonstrate experimentally manipulation of supercurrent in Al-AlO_x-Ti Josephson tunnel junctions by injecting quasiparticles in a Ti island from two additional tunnel-coupled Al superconducting reservoirs. Both supercurrent enhancement and quenching with respect to equilibrium are achieved. We demonstrate cooling of the Ti line by quasiparticle injection from the normal state deep into the superconducting phase. A model based on heat transport and non-monotonic current-voltage characteristic of a Josephson junction satisfactorily accounts for our findings.
description: 4 pages, 4 colour figures, published version
Gruppenhaltung weiblicher Jungrinder
Creators: name: Guth, Nicolas
name: Bockisch, Franz-Josef
name: Uminski, Kerstin
Publisher: name: LANDTECHNIK
Year: 1997

description: Im Vergleich zu Milchkühen werden von weiblichen Jungrindern geringere Ansprüche an Ernährung und Haltung gestellt. Rinder weisen ein großes Adaptionsvermögen an sehr unterschiedliche Haltungsbedingungen auf, wobei die Grenzen artgemäßer Haltungsformen nicht überschritten werden dürfen. Ziel der vorliegenden Untersuchungen war es, wichtige Leistungs- und Haltungsparameter der Jungtiere in fünf verschiedenen Haltungsformen zu erfassen. Diese dienen als Grundlage zur Gesamtkostenberechnung. Da Rinder geringeres Wachstum während der Winteraußenhaltung in den Sommermonaten wieder ausgleichen, bleibt der Vorteil der geringeren Baukosten dieser Variante auch bei den Gesamtaufzuchtkosten erhalten.
description: LANDTECHNIK, Bd. 52 Nr. 6 (1997)
Analysis of users' perceptions on mobile electronic commerce of fashion
Creators: name: Borba, Eduardo Henrique de
name: Tezza, Rafael
Publisher: name: figshare
Year: 2021
Subjects: subject: 150503 Marketing Management (incl. Strategy and Customer Relations)
subject: FOS: Economics and business

description: ABSTRACT: This study explores the dimensions of users’ perceptions on mobile electronic commerce (m-commerce) of fashion items. This type of digital commerce leads the ranking when it comes to the volume of online sales in Brazil, and identifying the factors that impact on user’s purchase intent is crucial for service providers in the area. The development of digital platforms is also essential. Due to the quantitative nature of this study, a questionnaire with 15 items was developed, and applied to a sample of 110 users. The results showed adapted dimensions of the UTAUT model and related to the area of fashion: Effort Expectancy, Performance Expectancy, and Perceived Satisfaction. This research adds an empirical work that uses UTAUT theory applied to fashion m-commerce. The managerial contribution is to identify the perceptual profile of its users, which is crucial for managing companies' marketing strategies. In the academic context, it contributes to the investigation of a theme that has been little explored, but that has great potential in the area of information and communication technology. Keywords: M-commerce; mobile electronic commerce; UTAUT; fashion; satisfaction
Semantic-based Knowledge Management and Document Processing in the e-Health domain
Creators: name: Romano, Sara
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Nowadays efficient knowledge management, organization and sharing has become a critical success factor. Due to the ease of data production within the Internet era, knowledge workers are increasingly overwhelmed by information from a bewildering array of information sources: emails, intranets, the web, social networks, etc. and yet still find it hard to access the specific information required for the task at hand. This implies that knowledge worker productivity is reduced and that organizations may be making decisions on the basis of incomplete knowledge.Social networking forms an important part of online activities of Web users and thus represent an information source able to provide useful information in real time. In recent years, Twitter, a microblogging service, has received much attention in research communities interest as a social medium for communicating with others and reporting news events.Thus in many contexts, as medical, juridical and humanistic ones, advanced knowledge management methodologies are needed to deal with the huge amount and heterogeneity of data.
In recent years several applications raised in order to support operators, working within different sectors, across the life cycle of a digital document. What makes these instruments often unproductive is the fact that they were born to support the traditional, manual documentation process mainly based on the massive use of paper but, given the many technological and regulatory constraints, they can not completely replace the traditional paper process.
For this purpose, the research activity I done in this work is aimed to investigate and propose knowledge management methodologies and techniques, mainly focused on the issues of information extraction, data mining and semantic document processing applied to heterogeneous and unstructured data.
title: AN INVESTIGATION OF MUNICIPAL SOLID WASTE MANAGEMENT DURING THE ARBA’EEN PILGRIMAGE IN KERBALA, IRAQ
Creators: name: Abdulredha, M
Publisher: name: Liverpool John Moores University
Year: 2021

description: Every year, religious events (REs) attended by millions of pilgrims, take place in different holy cities around the world. However, research on municipal solid waste management (MSWM) is limited despite the reputation of REs to generate large amounts of municipal solid waste (MSW), which negatively influences the environment and human health when poorly managed. The Arba’een is one of the largest REs in Iraq and worldwide that attracts more than 11 million pilgrims annually. A large quantity of MSW is produced during this event, which is poorly managed and disposed of in a dumpsite without any treatment, due to the lack of research and data about MSW generated during such events. Thus, this research aims to address part of this gap and contribute to new knowledge on MSWM at REs by studying the MSWM system applied at the Arba’een, a subject that has never been considered before. This study adopts mixed methods research approach, employing composition analysis for MSW, questionnaire surveys and interviews with the stakeholders (hoteliers, camp owners, pilgrims and MSWM authorities) and on-site observations as key methods for generation of data. The MSWM system was assessed based on the opinion of the key stakeholders and the Wasteaware benchmark indicators formwork. Numerical models were built to estimate the quantities of MSW produced by pilgrims’ accommodation (hotels and camps) based on the characteristics of the accommodation (capacity, area etc.). MSWM services users’ (hoteliers, camp owners and pilgrims) intention to participate in a recycling scheme and the variables influence this intention were studied with a view of investigating the possibility of introducing a recycling scheme at REs. The results showed that REs account for 14% of the city’s MSW and its main components were organic (57.9%), paper (14.9%) and plastic (14.6%). The MSWM system suffers from operational and governance weaknesses; the key weaknesses are lack of controlled disposal facility, absence of a formal recycling scheme, deficit of key waste-related data, poor public involvement, inadequate planning, and funding limitations. Statistical analyses showed that average municipal solid waste generation (MSWG) from hotels and camps were 112 and 413kg.day-1, respectively. Hotels’ MSWG is influenced by their capacity, staff size and expenditure while camps’ capacity, expenditure and food services affect its MSWG. MSWG from hotels and camps can be modelled with a coefficient of determination of about 0.80. In addition, more than 65% of MSWM system users are willing to participate in MSW recycling during REs and it is expected that about one third would perform recycling; this indicates that introducing MSW recycling during REs could be successful.
Forced Oscillations in Power Systems  (TR 110)
Creators: Lei Chen
Dan Trudnowski
Luke Dosiek
Sukumar Kamalasadan
Yanhui Xu
Xiaozhe Wang
Publisher: name: IEEE
Year: 2023

Forced oscillation is a phenomenon where the power swing is caused by an external periodic input, e.g., an oscillating steam valve in a turbine generator. The phenomenon has been known for years; however, only become more visible recently, thanks to the installation of Phasor Measurement Units (PMUs). This technical report is driven by the forced oscillation incidents reported across the globe and tries to cover the following three topics: 1. Demonstrate forced oscillations through examples, 2. Formulate forced oscillations, and 3. Provide means to distinguish forced from natural oscillations.
Forced oscillation is a phenomenon where the power swing is caused by an external periodic input, e.g., an oscillating steam valve in a turbine generator. The phenomenon has been known for years; however, only become more visible recently, thanks to the installation of Phasor Measurement Units (PMUs). This technical report is driven by the forced oscillation incidents reported across the globe and tries to cover the following three topics: 1. Demonstrate forced oscillations through examples, 2. Formulate forced oscillations, and 3. Provide means to distinguish forced from natural oscillations.
Reply to the Comment on "Spin and orbital angular momentum in gauge theories: Nucleon spin structure and multipole radiation revisited" [PRL 100:232002 (2008)]
Creators: name: Chen, Xiang-Song
name: Lü, Xiao-Fu
name: Sun, Wei-Min
name: Wang, Fan
name: Goldman, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This is a Reply to the Comment [arXiv:0807.0699] on our paper [PRL 100:232002 (2008)].
description: 2 pages, no figure
Volume 11: Issue 1: From Ship to Shore
Creators: Various
Publisher: name: IEEE
Year: 2023

Volume 11: Issue 1: From Ship to Shore
The March 2023 issue, with the theme "Sustainable Ports," offers a comprehensive view of port electrification. This issue was championed by Prof. John Prousalidis of the National Technology University at Athens (NTUA, Greece) and Prof. Fabio D'Agostino of the University of Genova (Italy). Prof. Prousalidis and Prof. D'Agostino have served actively in many IAS and PES technical committees relevant to marine power systems and electric ships. There are eight feature articles and two columns. Major milestones of sustainable ports, e.g., establishing ship-to-shore electric interconnections and charging battery-powered electric vessels, are covered in these articles. The green port initiative was pushed by the European Union, and the contributing authors are from Europe's utility industry; manufacturers; and research institutes across Europe, e.g., Greece, Italy, the United Kingdom, and Norway.
Ion Heat and Parallel Momentum Transport by Stochastic Magnetic Fields and Turbulence
Creators: name: Chen, Chang-Chun
name: Diamond, Patrick H.
name: Tobias, Steven M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Nuclear Theory (nucl-th)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: 76F25, 76M35, 76E25, 76F10, 76W05

description: The theory of turbulent transport of parallel momentum and ion heat by the interaction of stochastic magnetic fields and turbulence is presented. Attention is focused on determining the kinetic stress and the compressive energy flux. A critical parameter is identified as the ratio of the turbulent scattering rate to the rate of parallel acoustic dispersion. For the parameter large, the kinetic stress takes the form of a viscous stress. For the parameter small, the quasilinear residual stress is recovered. In practice, the viscous stress is the relevant form, and the quasilinear limit is not observable. This is the principal prediction of this paper. A simple physical picture is developed and shown to recover the results of the detailed analysis.
description: 16 pages, 5 figures, PPCF invited paper
Is There a Universal Mass Function?
Creators: name: Binggeli, Bruno
name: Hascher, Tatjana
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Following an old idea of Fritz Zwicky, we make an attempt to establish a universal mass function for astronomical objects on all scales. The object classes considered are: solar system planets and small bodies, exoplanets, brown dwarfs, stars and stellar remnants, open and globular clusters, molecular clouds, galaxies, groups and clusters of galaxies. For comparison we also include CDM halos taken from numerical simulations. We show that the mass functions of individual object classes, when properly normalized, can indeed be concatenated to build a surprisingly continuous mass function of the universe, from approximately M = 10^(-20)Msun (sub-kilometer size asteroids) up to M = 10^(16)Msun (rich clusters of galaxies), covering 36 orders of magnitude in mass. Most individual mass functions roughly follow a power law of the form phi(M) propto M^(-2). A notable exception are planets and small bodies which seem to obey a flatter distribution. CDM halos from high-resolution numerical simulations show a very similar relation, again of universal slope -2, from clusters of galaxies all the way down to the planetary mass scale. On the scale of stars and star clusters this is a remarkable coincidence, as the formation processes involved are thought to be totally different (bottom-up gravitational clustering of DM halos versus top-down gravoturbulent fragmentation of gas clouds).
description: 17 pages, 11 figures - Accepted for publication in PASP (review)
Data-Driven Dynamic Modeling in Power Systems (Slides)
Creators: Lingling Fan
Publisher: name: IEEE
Year: 2023

This webinar is one in the series of DOE Solar Energy Technologies Office (SETO) Open Energy Data Initiative � System Integration (OEDI-SI) webinar series.

OEDI-SI is currently developing key software tools, datasets novel distribution state estimation, control optimization, and transient event analyses. This initiative will enable users to have access to open-source data and algorithms along with ability to incorporate user-specific data to perform distribution-level analyses.

This webinar introduces ways to identify dynamic system models using measurement data. Six applications will be covered:
1 - Synchronous generator model parameter identification;
2 - Aggregated load model parameter identification;
3 - Reduced-order model identification for control design;
4 - Admittance model identification for subsynchronous resonance (SSR) screening;
5 -  Electromechanical oscillation mode identification from phasor measurement unit (PMU) data; and
6 - Inverter-based resource dynamic modeling for stability analysis.
This webinar is one in the series of DOE Solar Energy Technologies Office (SETO) Open Energy Data Initiative - System Integration (OEDI-SI) webinar series.

OEDI-SI is currently developing key software tools, datasets novel distribution state estimation, control optimization, and transient event analyses. This initiative will enable users to have access to open-source data and algorithms along with ability to incorporate user-specific data to perform distribution-level analyses.

This webinar introduces ways to identify dynamic system models using measurement data. Six applications will be covered:

1 - Synchronous generator model parameter identification;

2 - Aggregated load model parameter identification;

3 - Reduced-order model identification for control design;

4 - Admittance model identification for subsynchronous resonance (SSR) screening;

5 - Electromechanical oscillation mode identification from phasor measurement unit (PMU) data; and

6 - Inverter-based resource dynamic modeling for stability analysis.
Quantum Electrodynamics at Extremely Small Distances
Creators: name: Suslov, I. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The asymptotics of the Gell-Mann - Low function in QED can be determined exactly, β(g)= g at g\to\infty, where g=e^2 is the running fine structure constant. It solves the problem of pure QED at small distances L and gives the behavior g\sim L^{-2}.
description: Latex, 6 pages, 1 figure included
ANALYSIS OF USERS’ PERCEPTIONS ON MOBILE ELECTRONIC COMMERCE OF FASHION
Creators: name: Borba, Eduardo Henrique de
name: TEZZA, RAFAEL
Publisher: name: figshare
Year: 2021
Subjects: subject: 150503 Marketing Management (incl. Strategy and Customer Relations)
subject: FOS: Economics and business

description: RESUMO: This study explores the dimensions of users’ perceptions on mobile electronic commerce (m-commerce) of fashion items. This type of digital commerce leads the ranking when it comes to the volume of online sales in Brazil, and identifying the factors that impact on user’s purchase intent is crucial for service providers in the area. The development of digital platforms is also essential. Due to the quantitative nature of this study, a questionnaire with 15 items was developed, and applied to a sample of 110 users. The results showed adapted dimensions of the UTAUT model and related to the area of fashion: Effort Expectancy, Performance Expectancy, and Perceived Satisfaction. This research adds an empirical work that uses UTAUT theory applied to fashion m-commerce. The managerial contribution is to identify the perceptual profile of its users, which is crucial for managing companies' marketing strategies. In the academic context, it contributes to the investigation of a theme that has been little explored, but that has great potential in the area of information and communication technology. Keywords: M-commerce; mobile electronic commerce; UTAUT; fashion; satisfaction
Development of tests and preprocessing algorithms for evaluation and improvement of speech recognition units
Creators: name: Wasmeier, Hans
Publisher: name: University of British Columbia
Year: 2010

description: This study considered the evaluation of commercially available isolated word, speaker dependent, speech recognition units, and preprocessing techniques that may be used for improving their performance. The problem was considered in three separate stages. A series of tests were designed to exercise an isolated word, speaker dependent, speech recognition unit. These tests provided a sound basis for determining a given unit's strengths and weaknesses. This knowledge permits a more informed decision on the best recognition device for a given price range. As well, this knowledge may be used in the design of a robust vocabulary, and creation of guidelines for best performance. The test vocabularies were based on the forty English phonemes identified by Rabiner and Schafer [28] and the test variations were representative of common variations which may be expected in normal use. A digital archive system was implemented for storing the voice input of test subjects. This facility provided a data base for an investigation of preprocessing techniques. As well, it permits the testing of different speech recognition units with the same voice input, providing a platform for device comparison. Several speech preprocessing and performance improvement techniques were then investigated. Specifically, two types of time normalization, the enhancement of low energy phonemes and a change in training technique were investigated. These techniques permit a more accurate analysis of the failure mechanism of the speech recognition unit. They may also provide the basis for a speech preprocessor design which could be placed in front of a commercial speech recognition unit. A commercially available speech recognition unit, the NEC SR100, was used as a measure of the effectiveness of the tests and of the improvements. Results of the study indicated that the designed tests and the preprocessing & performance improvement techniques investigated were useful in identifying the speech recognition unit's weaknesses. Also, depending on the economics of implementation, it was found that preprocessing may provide a cost effective solution to some of the recognition unit's shortcomings.
Preventing Catastrophic Forgetting and Distribution Mismatch in Knowledge Distillation via Synthetic Data
Creators: name: Binici, Kuluhan
name: Pham, Nam Trung
name: Mitra, Tulika
name: Leman, Karianto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: With the increasing popularity of deep learning on edge devices, compressing large neural networks to meet the hardware requirements of resource-constrained devices became a significant research direction. Numerous compression methodologies are currently being used to reduce the memory sizes and energy consumption of neural networks. Knowledge distillation (KD) is among such methodologies and it functions by using data samples to transfer the knowledge captured by a large model (teacher) to a smaller one(student). However, due to various reasons, the original training data might not be accessible at the compression stage. Therefore, data-free model compression is an ongoing research problem that has been addressed by various works. In this paper, we point out that catastrophic forgetting is a problem that can potentially be observed in existing data-free distillation methods. Moreover, the sample generation strategies in some of these methods could result in a mismatch between the synthetic and real data distributions. To prevent such problems, we propose a data-free KD framework that maintains a dynamic collection of generated samples over time. Additionally, we add the constraint of matching the real data distribution in sample generation strategies that target maximum information gain. Our experiments demonstrate that we can improve the accuracy of the student models obtained via KD when compared with state-of-the-art approaches on the SVHN, Fashion MNIST and CIFAR100 datasets.
description: Accepted by the 2022 Winter Conference on Applications of Computer Vision (WACV 2022)
Real-time and content-aware applications and infrastructure: a holistic approach dealing with architectural, performance and security issues
Creators: name: Presta, Roberta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: This thesis has been carried out in the field of Computer Networks. We have looked after two challenging and popular multimedia applications over the Internet, namely Real-time Multimedia Applications, considering Multimedia Conferencing and Voice over IP (VoIP) services in general,
and Content-Oriented Applications, that are multimedia web services such as User Generated Contents (UGC) platforms and Online Social Networks. We have conducted our studies starting from a thorough review of both functional and non-functional issues related to the above mentioned application families.
We first consider a number of different facets of Real-time Multimedia Applications, dealing with architectural, performance and security issues. We embrace an engineering approach, by involving modeling, implementation and simulation. We try and adhere to standard architectures by also actively contributing to them, arriving at the definition and completion of a fullyfledged standards-compliant web conferencing platform. We propose original
contributions to face performance and security issues. With respect to the former aspect, we address scalability and performance analysis by leveraging formal methods. As to the latter point, we design an effective profiling system for VoIP users which is able to detect an interesting class of VoIP threats represented by “social” attacks.
In the second part of the thesis, we focus on Content-Oriented Applications, once again basing our work on a study of current architectural and performance challenges. We propose a framework for the performance optimization
of content-delivery based on the awareness of the contents to be delivered, as well as of the users’ behavior in terms of mobility, request patterns and content preferences.
Inductance Testing PCB Kit
Creators: EMC
Publisher: name: IEEE
Year: 2023

Inductance Testing PCB Kit, along with a nano-VNA and cables are packaged in a carrying case.

A series of specialized printed circuit boards (PCBs) was initially developed at the University of Twente, located in the Netherlands. These PCBs were subsequently donated to the IEEE EMC Society, with certain modifications implemented to emphasize specific aspects of inductance. Understanding inductance is crucial for comprehending concepts related to electromagnetic compatibility (EMC), power integrity (PI), and signal integrity (SI).

Our educational kit has been designed to facilitate the comprehension of these fundamental principles within an easily accessible measurement environment. It consists of the aforementioned PCBs, accompanied by a nano-VNA, cables, and adaptors. These components are conveniently packaged in a durable carrying case. The kit is available for purchase through the IEEE Resource Center, priced at $2,990 USD for EMC Society members and $3,800 USD for non-members.

Within the kit, you will find PCBs specifically tailored to address various concepts. These concepts include self-inductance, Lenz's law, inductance of capacitors under different trace distances (Capacitor Inductance #1), inductance of capacitors with different dielectric materials (Capacitor Inductance #2), inductance influenced by package size (Capacitor Inductance #3), inductance of different filter connections, inductance caused by splitting the ground-reference plane, inductance associated with guard traces, and the impact of stubs.

By utilizing this comprehensive kit, users can gain a deeper understanding of the principles and effects surrounding inductance, thereby enhancing their knowledge in the fields of EMC, PI, and SI.

Click "Add to Cart" and use a credit card to purchase this product. 
Fermion scattering on topological solitons in the nonlinear $O(3)$ $σ$-model
Creators: name: Loginov, A. Yu.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The scattering of Dirac fermions in the background fields of topological solitons of the $(2+1)$-dimensional nonlinear $O(3)$ $σ$-model is studied using both analytical and numerical methods. General formulae describing fermion scattering are obtained and the symmetry properties of the partial scattering amplitudes and elements of the $S$-matrix are determined. Within the framework of the Born approximation, the scattering amplitudes, differential cross-sections, and total cross-sections of fermion-soliton scattering are obtained in analytical forms, and their symmetry properties and asymptotic behavior are investigated. The dependences of the first several partial elements of the $S$-matrix on the momentum of the fermion are obtained using numerical methods, and some properties of these dependences are ascertained and discussed.
description: 20 pages, 9 figures
Bit error rate performance analysis and optimization of suboptimum detection procedures
Creators: name: Beaulieu, Norman Charles
Publisher: name: University of British Columbia
Year: 2010

description: Three suboptimum detection schemes are examined. The deterioration in performance, measured in the probability of error sense, of weighted partial decision, binary partial decision, and sample-and-sum detectors are analyzed. Even though these schemes are inferior to the digital matched filter, they can be used in systems with more modest computational capabilities. Analytic expressions are obtained for the penalties. The effects on the penalties of the signalling waveform employed, the number of samples processed, and the signal-to-noise ratio are considered in detail. Included are the penalties for the optimum weighted partial decision detector. The effects of dependence among the samples on the detector losses are investigated. It is shown that, in some cases, the losses of the suboptimum procedures can be reduced by processing more, dependent, samples. The amount of the loss that can be recovered depends on the prefilter characteristic and the sampling rate, as well as the detection algorithm. The structure of the optimum detector for hard-limited data signals is presented and its performance is compared with those of some commonly used schemes. Performance in Impulsive as well as Gaussian noise environments is considered. The optimum receiver for M-ary signalling based on received signal samples quantized to an arbitrary number of levels is derived and compared to another common detector. The fundamental loss in signal detectability due to hard-limiting in a sampled system operating in Gaussian noise is investigated. The relation of the loss to the signal-to-noise ratio and the number of samples is analyzed.