cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pointer Image Theory Usage for Common Mode Current Prediction at Power Lines
Creators: name: Alamsyah, Muhammad S.
name: Vieira, Francinei
name: Koj, Sebastian
name: Garbe, Heyno
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: This paper aims to explain the pointer image theory as a solution used to predict the common mode (CM) current at power lines, which is strongly related to radiated electromagnetic emissions. Techniques to measure the CM current at power lines in huge installations such as wind turbines (WT) are needed and novel methods are emerging. The WT tower may become an unintentional antenna due to the CM current flowing at its body through stray capacitances. The easiest way to measure the total CM current flow on a three-phase system is by measuring it using a device such as a current clamp or a Rogowski coil. This clamp must cover the whole 3-phase-cable bundle, however, the problem is that such a huge clamp or coil does not exist on the market, besides customized parts. The proposed method in this paper is to implement the pointer image theory to predict the CM current from a WT power plant. Laboratory measurements and SPICE simulations are used to show that the proposed method works well for CM current prediction.
Energy Cooperation in Energy Harvesting Communications
Creators: name: Gurakan, Berk
name: Ozel, Omur
name: Yang, Jing
name: Ulukus, Sennur
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In energy harvesting communications, users transmit messages using energy harvested from nature during the course of communication. With an optimum transmit policy, the performance of the system depends only on the energy arrival profiles. In this paper, we introduce the concept of energy cooperation, where a user wirelessly transmits a portion of its energy to another energy harvesting user. This enables shaping and optimization of the energy arrivals at the energy-receiving node, and improves the overall system performance, despite the loss incurred in energy transfer. We consider several basic multi-user network structures with energy harvesting and wireless energy transfer capabilities: relay channel, two-way channel and multiple access channel. We determine energy management policies that maximize the system throughput within a given duration using a Lagrangian formulation and the resulting KKT optimality conditions. We develop a two-dimensional directional water-filling algorithm which optimally controls the flow of harvested energy in two dimensions: in time (from past to future) and among users (from energy-transferring to energy-receiving) and show that a generalized version of this algorithm achieves the boundary of the capacity region of the two-way channel.
description: Submitted to IEEE Transactions on Communications, March 2013
Non-Hermitian Hamiltonians in decoherence and equilibrium theory
Creators: name: Castagnino, Mario
name: Fortin, Sebastian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: There are many formalisms to describe quantum decoherence. However, many of them give a non general and ad hoc definition of "pointer basis" or "moving preferred basis", and this fact is a problem for the decoherence program. In this paper we will consider quantum systems under a general theoretical framework for decoherence and we will present a tentative definition of the moving preferred basis. These ideas are implemented in a well-known open system model. The obtained decoherence and the relaxation times are defined and compared with those of the literature for the Lee- Friedrichs model.
description: 23 pages. arXiv admin note: substantial text overlap with arXiv:1009.0535, arXiv:1006.2130
title: Iron-Dithiothreitol Dependent Production of 8-Hydroxy-2'-Deoxyguanosine in DNA
Creators: name: Cook, David Allan
Publisher: name: Utah State University
Year: 1995

description: Oxidative damage to DNA in a metal-thiol system was studied. Calf thymus DNA was incubated in an iron(IIl)-dithiothreitol system prepared in various buffers. Damage was measured by monitoring the production of 8-hydroxy-2'-deoxyguanosine. DNA oxidation was proportional to the concentration of dithiothreitol (DTT) in HEPES and tris(hydroxymethyl)aminomethane (Tris) buffers while it was only roughly related to DTT concentration in sodium chloride. Incubation in potassium phosphate buffer produced no damage. The results indicate that hydroxyl radicals may be generated by the iron-OTT system in HEPES, Tris, and sodium chloride, while in the phosphate buffer an iron phosphate complex may be formed which limits the participation of the iron in the redox cycle.
Euclidean quantum gravity and stochastic approach: Physical reality of complex-valued instantons
Creators: name: Yeom, Dong-han
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this talk, we compare two states: the stationary state in stochastic inflation and the ground state wave function of the universe. We already know that, for the potential with a static field, two pictures give the same probability distribution. Here, we go beyond this limit and assert that two pictures indeed have deeper relations. We illustrate a simple example so that there is a corresponding instanton if a certain field value has a non-zero probability in the statistical side. This instanton should be complex-valued. Furthermore, the compact manifold in the Euclidean side can be interpreted as a coarse-graining grid size in the stochastic universe. Finally, we summarize the recent status and possible applications.
description: 4 pages, 1 figure; A proceeding for the Multiverse and Fundamental Cosmology Conference (Multicosmofun'12). Talk on September 10, 2012, Szczecin, Poland
Magneto-Optical Effects Enhancement in DMS Layers Utilizing 1-D Photonic Crystal
Creators: name: Koba, M.
name: Suffczyński, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a theoretical design of a structure combining a diluted magnetic semiconductor (DMS) layer with one-dimensional photonic crystal and show that it allows for a sizable (a few-fold) enhancement of the magneto-optical Kerr effect (MOKE) magnitude. We base our calculations on the transfer matrix method assuming realistic, and optimal with respect to a sample growth, parameters. We investigate representative cases of (Ga,Mn)N or (Cd,Mn)Te DMS layers deposited on the top of a respectively GaN- or CdTe-based distributed Bragg reflector, and highlight the applicability of the proposed design for both: III-V wurtzite and II-VI zinc-blende DMS.
description: 10 pages, 5 fugures
title: Distant Trails: A Multimedia Biography of E. Dee Miller
Creators: name: Ewer, Marty
Publisher: name: Utah State University
Year: 1997

description: My project is to author a multimedia presentation of my grandfather's biography. To undertake such a project as this requires a certain awareness of the task. Even as I sat down the first time to contemplate what I was trying to accomplish, I began to realize the implications of the overall project. I'm not just speaking of the research and labor required to put it all together but something that must precede that.
title: Sichtweisen - Bilder von Ekkehardt Hofmann und Gudrun Spranger. Ausstellung zum »Kunstsommer in der LGA 1999«. 8. Juni bis 16. Juli 1999 im Foyer der LGA, Tillystraße 2
Creators: name: Pallin-Lange, Christina
Publisher: name: University Library Heidelberg
Year: 2016

description: [nicht vorhanden / not available]
The pulsar spectral index distribution
Creators: name: Bates, Samuel D.
name: Lorimer, Duncan R.
name: Verbiest, Joris P. W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The flux density spectra of radio pulsars are known to be steep and, to first order, described by a power-law relationship of the form S_ν \propto ν^α, where S_ν is the flux density at some frequency νand αis the spectral index. Although measurements of αhave been made over the years for several hundred pulsars, a study of the intrinsic distribution of pulsar spectra has not been carried out. From the result of pulsar surveys carried out at three different radio frequencies, we use population synthesis techniques and a likelihood analysis to deduce what underlying spectral index distribution is required to replicate the results of these surveys. We find that in general the results of the surveys can be modelled by a Gaussian distribution of spectral indices with a mean of -1.4 and unit standard deviation. We also consider the impact of the so-called "Gigahertz-peaked spectrum" pulsars. The fraction of peaked spectrum sources in the population with significant turn-over at low frequencies appears to be at most 10%. We demonstrate that high-frequency (>2 GHz) surveys preferentially select flatter-spectrum pulsars and the converse is true for lower-frequency (<1 GHz) surveys. This implies that any correlations between αand other pulsar parameters (for example age or magnetic field) need to carefully account for selection biases in pulsar surveys. We also expect that many known pulsars which have been detected at high frequencies will have shallow, or positive, spectral indices. The majority of pulsars do not have recorded flux density measurements over a wide frequency range, making it impossible to constrain their spectral shapes. We also suggest that such measurements would allow an improved description of any populations of pulsars with 'non-standard' spectra.
description: 8 pages, 5 figures. Accepted by MNRAS
Instrumentos relacionados con el uso educativo de YouTube e Instagram
Creators: name: Beltrán-Flandoli, Ana-María
Publisher: name: figshare
Year: 2023
Subjects: Communication technology and digital media studies

description: Se realizó una revisión bibliográfica con el fin de determinar algunos estudios que mostraran procedimientos y posiciones de valor al respecto. Se tomaron en cuenta cuatro criterios: a) la calidad estructural de la herramienta de medición, b) los constructos teóricos del estudio, c) la tipología de escala de medición, y d) los procedimientos de validación.
Hydrodynamic modelling of ejecta shrapnel in the Vela supernova remnant
Creators: name: Miceli, M.
name: Orlando, S.
name: Reale, F.
name: Bocchino, F.
name: Peres, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Many supernova remnants (SNRs) are characterized by a knotty ejecta structure. The Vela SNR is an excellent example of remnant in which detached clumps of ejecta are visible as X-ray emitting bullets that have been observed and studied in great detail. We aim at modelling the evolution of ejecta shrapnel in the Vela SNR, investigating the role of their initial parameters (position and density) and addressing the effects of thermal conduction and radiative losses. We performed a set of 2-D hydrodynamic simulations describing the evolution of a density inhomogeneity in the ejecta profile. We explored different initial setups. We found that the final position of the shrapnel is very sensitive to its initial position within the ejecta, while the dependence on the initial density contrast is weaker. Our model also shows that moderately overdense knots can reproduce the detached features observed in the Vela SNR. Efficient thermal conduction produces detectable effects by determining an efficient mixing of the ejecta knot with the surrounding medium and shaping a characteristic elongated morphology in the clump.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society
Xylem, phloem and transpiration flows in developing European plums
Creators: name: Winkler, Andreas
name: Knoche, Moritz
Publisher: name: San Francisco, Ca. : PLOS
Year: 2021
Subjects: subject: Xylem
subject: phloem
subject: transpiration flow
subject: European plum
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Neck shrivel is a quality disorder of European plum (Prunus × domestica L.). It has been suggested that backflow in the xylem (from fruit to tree) could contribute to the incidence of neck shrivel in plum. The objective was to quantify rates of xylem, phloem and of transpiration flow in developing plum fruit. Using linear variable displacement transducers, changes in fruit volume were recorded 1) in un-treated control fruit, 2) in fruit that had their pedicels steam-girdled (phloem interrupted, xylem still functional) and 3) in detached fruit, left in the canopy (xylem and phloem interrupted). Xylem flow rates were occasionally negative in the early hours after sunrise, indicating xylem sap backflow from fruit to tree. Later in the day, xylem flows were positive and generally higher in daytime and lower at night. Significant phloem flow occurred in daytime, but ceased after sunset. During stage II (but not during stage III), the rates of xylem flow and transpiration were variable and closely related to atmospheric vapor pressure deficit. The relative contribution of xylem inflow to total sap inflow averaged 79% during stage II, decreasing to 25% during stage III. In contrast, phloem sap inflow averaged 21% of total sap inflow during stage II, increasing to 75% in stage III. Our results indicate that xylem backflow occurs early in the day. However, xylem backflow rates are considered too low to significantly contribute to the incidence of neck shrivel.
Leitungsgebundene Störungen eines Flugzeugantriebsstrangs unter asymmetrischer Last
Creators: name: Kebel, Robert
name: Stadtler, Thiemo
name: Schubert, Maximilian
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: In der Luftfahrt ist es notwendig, Situationen zu beherrschen, die in einem stationären Betrieb eines Antriebstrangs eine untergeordnete Rolle spielen. Dazu gehört die Betrachtung systematischer Störursachen, aber auch die Betrachtung von Fehlerfällen und deren Auswirkung. Dieser Beitrag erläutert angesichts der absehbaren Elektrifizierung der Luftfahrt, wie das elektromagnetische Störpotenzial eines elektrischen Antriebsstrangs entsteht und inwiefern es durch existierende Luftfahrtstandards [1] abgesichert ist. Er benennt die systematische Ursache von Störspannungen und die Auswirkung von Netzformen und Asymmetrien der Last. Die Auswahl der Umrichtertopologie, die Wahl der Netzform, und im mehrphasigen Antriebsstrang die Betrachtung von Asymmetrien und damit auch seltene Fehlerfällen, die elektrisch tolerierbar sein können, beeinflussen das Maß der zu beherrschenden Störwirkung. Das Störpotenzial ist eine Folge von Architekturentscheidungen, die früh im Entwicklungsprozess getroffen werden sollten.
title: Reeducation in the American Zone: The Quest for Democracy in Post-War Germany
Creators: name: Sharp, Lael D.
Publisher: name: Utah State University
Year: 1989

description: "'There is an embarrassment ... about trying to force people to have freedom.'"1 This statement, given in 1943 by Stringfellow Barr, a member of the General Advisory Committee on Reeducation for the State Department, proved to be prophetic for the reeducation and denazification efforts of the United States in post-war Germany. Faced with a lack of consensus about policy goals, a severe shortage of resources, a scarcity of qualified Germans untainted by National Socialism, and a decimated educational infrastructure, the direct results of reeducation were predestined to be meager. However, if democracy was to take root and flourish in Germany this time around, these efforts were critical. Experience had shown that the mere establishment of the outward forms of democratic government was worthless -- what was needed was an inner spirit to give them meaning. This was the task of reeducation.
Multiwavelength interferometric observations and modeling of circumstellar disks
Creators: name: Schegerer, A. A.
name: Ratzka, T.
name: Schuller, P. A.
name: Wolf, S.
name: Mosoni, L.
name: Leinert, Ch.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the structure of the innermost region of three circumstellar disks around pre-main sequence stars HD 142666, AS 205 N, and AS 205 S. We determine the inner radii of the dust disks and, in particular, search for transition objects where dust has been depleted and inner disk gaps have formed at radii of a few tenths of AU up to several AU. We performed interferometric observations with IOTA, AMBER, and MIDI in the infrared wavelength ranges 1.6-2.5um and 8-13um with projected baseline lengths between 25m and 102m. The data analysis was based on radiative transfer simulations in 3D models of young stellar objects (YSOs) to reproduce the spectral energy distribution and the interferometric visibilities simultaneously. Accretion effects and disk gaps could be considered in the modeling approach. Results from previous studies restricted the parameter space. The objects of this study were spatially resolved in the infrared wavelength range using the interferometers. Based on these observations, a disk gap could be found for the source HD 142666 that classifies it as transition object. There is a disk hole up to a radius of R_in=0.30AU and a (dust-free) ring between 0.35AU and 0.80AU in the disk of HD 142666. The classification of AS 205 as a system of classical T Tauri stars could be confirmed using the canonical model approach, i. e., there are no hints of disk gaps in our observations.
description: accepted by Astronomy & Astrophysics
High-precision photometry by telescope defocussing. V. WASP-15 and WASP-16
Creators: name: Southworth, J.
name: Mancini, L.
name: Browne, P.
name: Burgdorf, M.
name: Novati, S. Calchi
name: Dominik, M.
name: Gerner, T.
name: Hinse, T. C.
name: Jorgensen, U. G.
name: Kains, N.
name: Ricci, D.
name: Schafer, S.
name: Schonebeck, F.
name: Tregloan-Reed, J.
name: Alsubai, K. A.
name: Bozza, V.
name: Chen, G.
name: Dodds, P.
name: Dreizler, S.
name: Fang, X. -S.
name: Finet, F.
name: Gu, S. -H.
name: Hardis, S.
name: Harpsoe, K.
name: Henning, Th.
name: Hundertmark, M.
name: Jessen-Hansen, J.
name: Kerins, E.
name: Kjeldsen, H.
name: Liebig, C.
name: Lund, M. N.
name: Lundkvist, M.
name: Mathiasen, M.
name: Nikolov, N.
name: Penny, M. T.
name: Proft, S.
name: Rahvar, S.
name: Sahu, K.
name: Scarpetta, G.
name: Skottfelt, J.
name: Snodgrass, C.
name: Surdej, J.
name: Wertz, O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new photometric observations of WASP-15 and WASP-16, two transiting extrasolar planetary systems with measured orbital obliquities but without photometric follow-up since their discovery papers. Our new data for WASP-15 comprise observations of one transit simultaneously in four optical passbands using GROND on the MPG/ESO 2.2m telescope, plus coverage of half a transit from DFOSC on the Danish 1.54m telescope, both at ESO La Silla. For WASP-16 we present observations of four complete transits, all from the Danish telescope. We use these new data to refine the measured physical properties and orbital ephemerides of the two systems. Whilst our results are close to the originally-determined values for WASP-15, we find that the star and planet in the WASP-16 system are both larger and less massive than previously thought.
description: Accepted for publication in MNRAS; 9 pages, 7 tables, 6 figures. The light curves are available from http://www.astro.keele.ac.uk/jkt/data-teps.html and the results are included in TEPCat at http://www.astro.keele.ac.uk/jkt/tepcat/
Praktische Erfahrungen mit Magnetfeldprüfungen in der Medizintechnik
Creators: name: Buchwald, Harald
name: Heinrich, Ralf
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Die Störfestigkeitsprüfungen mit Magnetfeldern bei bestimmten Frequenzen im Bereich von 9 kHz bis 26 MHz sind eine neue Anforderung zur Prüfung der medizinischen elektrischen Geräte. Die Prüfungen werden in Anlehnung an die DIN EN 61000-4-39 [2] mit der darin spezifizierten Prüftechnik und Verfahren durchgeführt. Da auch die DIN EN 61000-4-39 relativ neu ist, liegen auch dazu bislang nur begrenzt praktische Erfahrungen vor. Die Einführung der neuen normativen Anforderungen wurde erforderlich, da einerseits die Verwendung mobiler Strahlungsquellen in den letzten Jahren eine starke Zunahme erfahren hat und andererseits die „klassischen“ gestrahlten Störfestigkeitstests Nahbereichsphänomene teilweise nur unzureichend oder gar nicht simulieren können. Das liegt nicht nur an der u.U. viel höheren Feldstärke im Nahbereich (einige cm Abstand) einer Strahlungsquelle, sondern auch an Nahbereichseffekten, die aus einer punktuellen, lokalen Exposition eines Gerätes durch eine Strahlungsquelle herrühren, die zu anderen Störeffekten führen kann, als eine integrale, homogene Bestrahlung mit einem homogenen Feld.
title: Banking in China: Fiscal Policy Under Pressure
Creators: name: Roundy, Thor
Publisher: name: Utah State University
Year: 1989

description: The radical changes occurring in China can be both exciting and frightening. Attempting to keep in reign a skyrocketing economy, Chinese Leaders such as Liu Hongru and Zhang Wei have become modern day entrepreneurs in creating a new national economy. Like typical entrepreneurs, Chinese leadership is making decisions by the seat of their pants, attempting to control growth under volatile new conditions of reform.
Rotational Projection Statistics for 3D Local Surface Description and Object Recognition
Creators: name: Guo, Yulan
name: Sohel, Ferdous
name: Bennamoun, Mohammed
name: Lu, Min
name: Wan, Jianwei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.4; I.5.4

description: Recognizing 3D objects in the presence of noise, varying mesh resolution, occlusion and clutter is a very challenging task. This paper presents a novel method named Rotational Projection Statistics (RoPS). It has three major modules: Local Reference Frame (LRF) definition, RoPS feature description and 3D object recognition. We propose a novel technique to define the LRF by calculating the scatter matrix of all points lying on the local surface. RoPS feature descriptors are obtained by rotationally projecting the neighboring points of a feature point onto 2D planes and calculating a set of statistics (including low-order central moments and entropy) of the distribution of these projected points. Using the proposed LRF and RoPS descriptor, we present a hierarchical 3D object recognition algorithm. The performance of the proposed LRF, RoPS descriptor and object recognition algorithm was rigorously tested on a number of popular and publicly available datasets. Our proposed techniques exhibited superior performance compared to existing techniques. We also showed that our method is robust with respect to noise and varying mesh resolution. Our RoPS based algorithm achieved recognition rates of 100%, 98.9%, 95.4% and 96.0% respectively when tested on the Bologna, UWA, Queen's and Ca' Foscari Venezia Datasets.
description: The final publication is available at link.springer.com International Journal of Computer Vision 2013
Norm continuous unitary representations of Lie algebras of smooth sections
Creators: name: Janssens, Bas
name: Neeb, Karl-Hermann
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B15, 17B65, 17B67, 22E45, 22E65, 22E67

description: We give a complete description of the bounded (i.e. norm continuous) unitary representations of the Fréchet-Lie algebra of all smooth sections, as well as of the LF-Lie algebra of compactly supported smooth sections, of a smooth Lie algebra bundle whose typical fiber is a compact Lie algebra. For the Lie algebra of all sections, bounded unitary irreducible representations are finite tensor products of so-called evaluation representations, hence in particular finite-dimensional. For the Lie algebra of compactly supported sections, bounded unitary irreducible (factor) representations are possibly infinite tensor products of evaluation representations, which reduces the classification problem to results of Glimm and Powers on irreducible (factor) representations of UHF C*-algebras. The key part in our proof is the classification of irreducible bounded unitary representations of Lie algebras that are the tensor product of a compact Lie algebra and a unital real continuous inverse algebra: every such representation is a finite product of evaluation representations. On the group level, our results cover in particular the bounded unitary representations of the identity component of the group of smooth gauge transformations of a principal fiber bundle with compact base and structure group, and the connected component of the group of special unitary n times n matrices with values in an involutive commutative continuous inverse algebra.
description: 44 pages
S-Parametermessung zur Lokalisation von Störungen in Schirmen
Creators: name: Siebauer, Christian
name: Garbe, Heyno
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Im Bereich der Elektromagnetischen Verträglichkeit ist Schirmung ein sehr wichtiges Thema. Dabei ist es von besonderer Bedeutung, dass diese vollständig abgeschlossen ist. Ist dies nicht der Fall, können elektromagnetische Felder zwischen geschirmten und äußeren Bereich ein- und ausdringen. Eine Überprüfung auf Schirm-Intaktheit kann mittels verschiedener Methoden erfolgen. In einer Arbeit von Baum [1] wurde untersucht wie man mit Hilfe von Drahtwicklungen, welche sowohl außen als auch innen am zu untersuchenden Schirmungsgehäuse angebracht werden, Risse in diesem detektieren und lokalisieren kann. Genutzt wird hierbei ein kurzer, steilflankiger Puls im Zeitbereich. In einer darauf aufbauenden Arbeit von Reiser [2] wurden Messungen im Frequenzbereich durchgeführt. Dazu wird eine Koaxialleitung so modifiziert und aufgetrennt, dass deren Außenleiter mit Flächenelektroden an das zu untersuchende metallische Gehäuse angebracht wird und der Innenleiter über die zu detektierende Störstelle (Schirmungsunterbrechung). Dadurch entsteht eine Streifenleitungsstruktur welche mit einem Messempfänger verbunden wird. Wird im Inneren des Gehäuses ein Erregerfeld erzeugt, dringt dieses durch die Störstellen nach außen und kann von der Streifenleitungsstruktur detektiert werden. Die vorliegende Arbeit soll auf dem Prinzip der Erstellung einer Streifenleitungsstruktur aufbauen und eine Messmethode vorstellen, mit der sich Schirmungsunterbrechungen aber auch sich bildende kleinste Risse in Koaxialkabelschirmen und bedeckten Metallflächen, wie bspw. lackierten Gehäusen, detektieren lassen. Im Falle einer Untersuchung von Koaxialkabeln ist die Time-Domain Reflectometry (TDR) [3] bereits eine bewährte Methode, um Störungen, wie u. A. Unterbrechungen, Quetschungen oder Risse im Impedanzverlauf des Kabels zu detektieren und zusätzlich zu lokalisieren. Bei einer solchen TDR-Messung werden jedoch Messgeräte wie Speicheroszilloskope verwendet, welche eine sehr hohe Messbandbreite von DC bis in den zweistelligen GHz-Bereich aufweisen. Ziel dieser Arbeit ist es jedoch zum einen, eine Messsonde zu entwickeln, mit welcher die Oberfläche auf Störungen abgesucht werden kann und zum anderen die Vorteile einer TDR-Messung mittels Messgeräte mit geringerer Messbandbreite nachzubilden.
Identifying Metaphor Hierarchies in a Corpus Analysis of Finance Articles
Creators: name: Georw, Aaron
name: Keane, Mark
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Using a corpus of over 17,000 financial news reports (involving over 10M words), we perform an analysis of the argument-distributions of the UP- and DOWN-verbs used to describe movements of indices, stocks, and shares. Using measures of the overlap in the argument distributions of these verbs and k-means clustering of their distributions, we advance evidence for the proposal that the metaphors referred to by these verbs are organised into hierarchical structures of superordinate and subordinate groups.
MATLAB/Octave function to evaluate time-domain signals according to the measurement bandwidth and average/peak detector of EMI test receivers
Creators: name: Bendicks, Andreas
name: Dörlemann, Tobias
name: Krause, Caroline
name: Frei, Stephan
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Electromagnetic emissions are often measured with EMI (electromagnetic emissions) test receivers or spectrum analyzers [1] that must be specifically set up regarding their measurement bandwidth, frequency step size and measurement time (e.g. [2] for automobiles). Additionally, the emissions must be evaluated by different measurement detectors (e.g. average or peak) that may all have individual limit lines like in [2]. EMI measurements can be done in frequency or in time domain [1]. Frequency-domain measurement devices sequentially apply the superheterodyne principle to the frequencies of interest [3]. Since the measurement time for each frequency may take up to several seconds, the total measurement time can become long and cumbersome [4]. To overcome this problem, the time-domain signal can be processed by using, e.g., fast Fourier transforms (FFTs) and further methods [4]. This principle can also be applied to evaluate time-domain simulation results according to EMC standards. There are numerous publications on this topic including, e.g., [4] and [5]. In this contribution, a MATLAB/Octave function is presented that evaluates time-domain signals according to EMC standards. This “virtual EMI test receiver” mimics actual EMI test receivers regarding their measurement bandwidth, frequency step and average/peak detection. Potential use cases include the EMC evaluation of oscilloscope measurements or simulation results. The developed function can be found in the MATLAB Central (https://mathworks.com/matlabcentral/) under the title “Virtual EMI test receiver” by Andreas Bendicks [6]. In the following section, the superheterodyne measurement principle is described that is mimicked by the virtual EMI test receiver. Afterward, the corresponding signal processing of the MATLAB/Octave function is explained. The precision of the MATLAB/Octave function is verified by comparing its results to the ones of an actual EMI test receiver. The work is closed by a conclusion and an outlook.
Development of a Smart RF Gain Equalizer for Broadband Power Amplifier Applications
Creators: name: Bacqué, Ludovic
name: Turki, Hamza
name: Schutz, Maxime
Publisher: name: Aachen : Apprimus
Year: 2022
Subjects: subject: EMV
subject: Verträglichkeit
subject: Elektromagnetik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: This paper describes a generalized analytical-numerical model of “Smart” RF equalizer, for ultra-wideband power amplifiers (PA) applications. The novelty of this study consists of generating a universal gain-equalizer database, set from electromagnetic (EM) software, and processed with analytical tools, to deal with any random PA gain profile in real time. A numerical tool is then developed to compute lumped elements values , from a random gain response imported in S2P file format , to achieve given specifications in terms of gain flatness and frequency band. These values are finally injected in a 3D EM realistic simulation to ensure a final accurate validation of the Equalizer. A concrete example of a microstrip equalizer is illustrated in the frequency band [1 GHz to 6 GHz] and experimental results are depicted to validate the proposed method.
Strong restriction on inflationary vacua from the local gauge invariance II: Infrared regularity and absence of the secular growth in Euclidean vacuum
Creators: name: Tanaka, Takahiro
name: Urakawa, Yuko
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the initial state of the inflationary universe. In our recent publications, we showed that requesting the gauge invariance in the local observable universe to the initial state guarantees the infrared (IR) regularity of loop corrections in a general single clock inflation. Following this study, in this paper, we show that choosing the Euclidean vacuum ensures the gauge invariance in the local universe and hence the IR regularity of loop corrections. It has been suggested that loop corrections to inflationary perturbations may yield the secular growth, which can lead to the break down of the perturbative analysis in an extremely long term inflation. The absence of the secular growth has been claimed by picking up only the IR contributions, which we think is incomplete because the non-IR modes which are comparable to or smaller than the Hubble scale potentially can contribute to the secular growth. We prove the absence of the secular growth without neglecting these non-IR modes to a certain order in the perturbative expansion. We also discuss how the regularity of the n-point functions for the genuinely gauge invariant variable constrains the initial states of the inflationary universe. These results apply in a fully general single field model of inflation.
description: 23 pages, 3 figures
Photon mediated interaction between distant quantum dot circuits
Creators: name: Delbecq, M. R.
name: Bruhat, L. E.
name: Viennot, J. J.
name: Datta, S.
name: Cottet, A.
name: Kontos, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Engineering the interaction between light and matter is an important goal in the emerging field of quantum opto-electronics. Thanks to the use of cavity quantum electrodynamics architectures, one can envision a fully hybrid multiplexing of quantum conductors. Here, we use such an architecture to couple two quantum dot circuits . Our quantum dots are separated by 200 times their own size, with no direct tunnel and electrostatic couplings between them. We demonstrate their interaction, mediated by the cavity photons. This could be used to scale up quantum bit architectures based on quantum dot circuits or simulate on-chip phonon-mediated interactions between strongly correlated electrons.
Letter to Mr. Sirajudin, April 6, 1949?
Creators: name: Tharchin, G., 1890-1976
Publisher: name: Columbia University
Year: 2020
Subjects: Printing presses
Finance
World politics

description: Correspondence from Gegen Dorje Tharchin to Mr. Sirajudin (of the Indian Mission, Lhasa?) requesting he serve as an agent for distributing the Tibet Mirror newspaper (in Lhasa?)
Zur Darstellung und Reaktivität einiger intermetallischer Verbindungen
Creators: name: Plaggenborg, Thorsten
Publisher: name: Hannover : Universität Hannover
Year: 1999
Subjects: subject: Intermetallische Verbindungen
subject: Transportreaktion
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Recent Formation of a Spiral Disk Hosting Progenitor Globular Clusters at the center of the Perseus Brightest Cluster Galaxy: I. Spiral Disk
Creators: name: Yeung, Michael C. H.
name: Ohyama, Youichi
name: Lim, Jeremy
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We address the nature and origin of a spiral disk at the center of NGC 1275, the giant elliptical galaxy at the center of the Perseus cluster, that spans a radius of $\sim$$5\,\rm kpc$. By comparing stellar absorption lines measured in long-slit optical spectra with synthetic spectra for single stellar populations, we find that fitting of these lines requires two stellar populations: (i) a very young population that peaks in radial velocity at $\pm 250 {\rm \, km \, s^{-1}}$ of the systemic velocity within a radius of $\sim$$720\,\rm pc$ of the nucleus, a $1\,σ$ velocity dispersion significantly lower than $140 {\rm \, km \, s^{-1}}$, and an age of $0.15 \pm 0.05 \rm\,Gyr$; and (ii) a very old population having a constant radial velocity with a radius corresponding to the systemic velocity, a much broader velocity dispersion of $\sim$$250 {\rm \, km \, s^{-1}}$, and an age of around $10\,\rm Gyr$. We attribute the former to a post-starburst population associated with the spiral disk, and the latter to the main stellar body of NGC 1275 along the same sight line. If the spiral disk is the remnant of a cannibalized galaxy, then its progenitor would have had to retain an enormous amount of gas in the face of intensive ram-pressure stripping so as to form a total initial mass in stars of $\sim 3 \times 10^9 \,M_\odot$. More likely, the central spiral originally comprised a gaseous body accreted over the distant past from a residual cooling flow, before experiencing a starburst $\sim$$0.15\,\rm Gyr$ ago to form its stellar body.
description: 34 pages, 14 figures, accepted by ApJ
Large nuclear spin polarization in gate-defined quantum dots using a single-domain nanomagnet
Creators: name: Petersen, Gunnar
name: Hoffmann, Eric A.
name: Schuh, Dieter
name: Wegscheider, Werner
name: Giedke, Geza
name: Ludwig, Stefan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electron-nuclei (hyperfine) interaction is central to spin qubits in solid state systems. It can be a severe decoherence source but also allows dynamic access to the nuclear spin states. We study a double quantum dot exposed to an on-chip single-domain nanomagnet and show that its inhomogeneous magnetic field crucially modifies the complex nuclear spin dynamics such that the Overhauser field tends to compensate external magnetic fields. This turns out to be beneficial for polarizing the nuclear spin ensemble. We reach a nuclear spin polarization of ~50%, unrivaled in lateral dots, and explain our manipulation technique using a comprehensive rate equation model.
ATLASGAL --- Environments of 6.7\,GHz methanol masers
Creators: name: Urquhart, J. S.
name: Moore, T. J. T.
name: Schuller, F.
name: Wyrowski, F.
name: Menten, K. M.
name: Thompson, M. A.
name: Csengeri, T.
name: Walmsley, C. M.
name: Bronfman, L.
name: König, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using the 870-$μ$m APEX Telescope Large Area Survey of the Galaxy (ATLASGAL), we have identified 577 submillimetre continuum sources with masers from the methanol multibeam (MMB) survey in the region $280\degr < \ell < 20\degr$; $|\,b\,| < 1.5\degr$. 94\,per\,cent of methanol masers in the region are associated with sub-millimetre dust emission. We estimate masses for ~450 maser-associated sources and find that methanol masers are preferentially associated with massive clumps. These clumps are centrally condensed, with envelope structures that appear to be scale-free, the mean maser position being offset from the peak column density by 0.0 \pm 4". Assuming a Kroupa initial mass function and a star-formation efficiency of ~30\,per\,cent, we find that over two thirds of the clumps are likely to form clusters with masses >20\,\msun. Furthermore, almost all clumps satisfy the empirical mass-size criterion for massive star formation. Bolometric luminosities taken from the literature for ~100 clumps range between ~100 and 10$^6$\,\lsun. This confirms the link between methanol masers and massive young stars for 90\,per\,cent of our sample. The Galactic distribution of sources suggests that the star-formation efficiency is significantly reduced in the Galactic-centre region, compared to the rest of the survey area, where it is broadly constant, and shows a significant drop in the massive star-formation rate density in the outer Galaxy. We find no enhancement in source counts towards the southern Scutum-Centaurus arm tangent at $\ell ~ 315\degr$, which suggests that this arm is not actively forming stars.
description: 25 pages, 23 figures, 4 tables. The resolution of Figs. 1, 18 and 23 have been reduced to comply with file size restrictions, but high resolution version of the paper is available on request. Paper accepted for publication in MNRAS
Model Sensitivity in Holographic Superconductors and their Deconstructed Cousins
Creators: name: Erlich, Joshua
name: Wang, Zhen
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Holographic models of superconductors successfully reproduce certain experimental features of high-temperature superconductors, such as a large gap-to-T_c ratio compared to that of conventional superconductors. By deconstructing the extra dimension of these holographic models, similar phenomenology is described by a class of models defined in the natural dimension of the superconducting system. We analyze the sensitivity of certain observables in holographic and deconstructed holographic superconductors to details of the extra-dimensional spacetime. Our results support the notion that certain quantitative successes of simple models of this type are accidental. However, we also find a certain universal relationship between superconducting observables.
description: 15 pages, 19 eps figures
Chiral restoration of the momentum space quark propagator through Dirac low-mode truncation
Creators: name: Schröck, Mario
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate the chirally improved (CI) Landau gauge quark propagator in two flavor lattice Quantum Chromodynamics and study thereon the effects of Dirac low-mode removal. The application of tree-level improvement of the propagator and tree-level correction of the lattice dressing functions removes the leading discretization artifacts. We find the dynamically generated mass in the infrared domain of the mass function to dissolve continuously with the reduction level and furthermore we observe strong suppression of the wave-function renormalization function for small momenta.
description: 7 pages, 4 figures; to appear in the proceedings of the Confinement X conference (8-12 October 2012, TUM Campus Garching, Munich.)
Non-Markovianity during quantum Zeno effect
Creators: name: Thilagam, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We examine the Zeno and anti-Zeno effects in the context of non-Markovian dynamics in entangled spin-boson systems in contact with noninteracting reservoirs. We identify enhanced non-Markovian signatures in specific two-qubit partitions of a Bell-like initial state, with results showing that the intra-qubit Zeno effect or anti-Zeno effect occurs in conjunction with inter-qubit non-Markovian dynamics for a range of system parameters. The time domain of effective Zeno or anti-Zeno dynamics is about the same order of magnitude as the non-Markovian time scale of the reservoir correlation dynamics, and changes in decay rate due to the Zeno mechanism appears coordinated with information flow between specific two-qubit partitions. We extend our analysis to examine the Zeno mechanism-non-Markovianity link using the tripartite states arising from a donor-acceptor-sink model of photosynthetic biosystems.
description: 14 pages, 4 figs., Journal of Chemical Physics (2013), to appear
Neue Membrantechnologien zur Isolierung hochwertiger Minorkomponenten aus Süßmolke - Methodenentwicklung für den industriellen Einsatz
Creators: name: Weiß, Torsten
Publisher: name: Hannover : Universität Hannover
Year: 1999
Subjects: subject: Adsorptionschromatographie
subject: Lactoferrin
subject: Membranverfahren
subject: Molke
subject: Prozessentwicklung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Begrenzung von heterologer Enkapsidierung und Rekombination bei pathogen-vermittelter Resistenz gegen das Plum pox virus der Pflaume (PPV)
Creators: name: Varrelmann, Mark
Publisher: name: Hannover : Universität Hannover
Year: 1999
Subjects: subject: Potyvirus
subject: recombination
subject: heterologous encapsidation
subject: Heterologe Genexpression
subject: Nicotiana benthamiana
subject: Plum Pox Virus
subject: Resistenz
subject: Transgene Pflanzen
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
title: The Proposed Use of an Anatomically Marked Presurgically Fitted Prostheses With Infants Who Have Unrepaired Cleft Palates
Creators: name: Moser, Amy
Publisher: name: Utah State University
Year: 1992

description: Approximately one out of every 750 children are born with some type of an oral cleft (McWilliams, Morris, & Shelton, 1984) Children with clefts of the palate in general have a higher incidence of articulation disorders than do children without clefts. Typical speech problems which tend to occur are hypernasality and multiple articulation errors, often consisting of atypical tongue placement in the mouth or nontypical articulation at sites in the larynx or pharynx. These speech problems can be severe and may require years of expensive, long-term professional treatment to remediate.