cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Scaling Analysis of Nanowire Phase Change Memory
Creators: name: Liu, Jie
name: Yu, Bin
name: Anantram, M. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This letter analyzes the scaling property of nanowire (NW) phase change memory (PCM) using analytic and numerical methods. The scaling scenarios of the three widely-used NW PCM peration schemes (constant electric field, voltage, and current) are studied and compared. It is shown that if the device size is downscaled by a factor of 1/k (k>1), the peration energy (current) will be reduced by more than k3 (k) times, and the operation speed will be increased by k2 times. It is also shown that more than 90% of operation energy is wasted as thermal flux into substrate and electrodes. We predict that, if the wasted thermal flux is effectively reduced by heat confinement technologies, the energy consumed per RESET operation can be decreased from about 1 pJ to less than 100 fJ. It is shown that reducing NW aspect ratio (AR) helps decreasing PCM energy consumption. It is revealed that cross-cell thermal proximity disturbance is counter-intuitively alleviated by scaling, leading to a desirable scaling scenario.
Optimierung der Makromodellierung von Übertragungsstrecken mit Vector-Fitting-Methoden durch Anpassung der Eingangsdaten
Creators: name: Miropolsky, Sergey
name: Nieden, Friedrich Zur
name: Frei, Stephan
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Umwandlung
subject: Artefakt
subject: Zustandsraum
subject: Admittanz
subject: Transformator
subject: DC-DC-Wandler
subject: Frequenzbereich
subject: Makromodellierung
subject: Netzwerkparameter
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: Grundlegende Prinzipien, die bei der Makromodellierung von passiven Komponenten und bei der Erstellung der Schaltkreismodelle (SPICE oder VHDL-AMS) in der Zustandsraumform für verschiedene Netzwerkparameter zu berücksichtigen sind, werden beschrieben. Die möglichen Fehler in den gemessenen Datensätzen und den damit möglichen Artefakten in Makromodellen werden diskutiert. Diese Artefakte können in der ursprünglichen Darstellung (z.B. eine Admittanz (Y) oder Streuung (S)) unsichtbar sein, fallen aber nach Umwandlung in eine andere Darstellung (z.B. Impedanz (Z)) deutlich auf und können in folgenden EMV-Simulationen unerwartete Probleme verursachen. Im Tieffrequenzbereich können Fehler durch das Simulieren der Netzwerkparameter mit einem einfachen physikalischen Schaltkreismodell und der anschließenden Verkettung der NF-Simulationsdaten mit den HF-Daten beseitigt werden. Das Verfahren wird an zwei Beispielen für Übertragungsstrecken (eine einfache verdrillte Leitung und ein Transformator für einen DC-DC-Wandler) gezeigt. In beiden Testfällen konnten die besprochenen Schwierigkeiten mit Hilfe von der Verkettung von simulierten NF-Daten und der Auswahl einer passenden Darstellung der Netzwerkparameter für die Makromodellierung behoben werden.
Korrekturverfahren für Feld-Scan-Daten zur Bestimmung des elektromagnetischen Feldes in einer realen Messumgebung
Creators: name: Rinas, Denis
name: Zeichner, Alexander
name: Frei, Stephan
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Korrekturverfahren
subject: Antennenmessung
subject: elektromagnetisches Feld
subject: Fernfeld
subject: Modellberechnung
subject: Messdaten
subject: Übertragungsfunktion
subject: Stromverteilung
subject: Nahfeld
subject: Verifikation
subject: horizontale Polarisation
subject: Teststruktur
subject: Messumgebung
subject: Scan-Daten
subject: Korrekturfunktion
subject: Antennenspannung
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: Als Alternative für ALSE Antennenmessungen können sogenannte Feld-Scan-Verfahren zum Einsatz kommen. Diese erlauben eine genauere und reproduzierbare Bestimmung des abgestrahlten elektromagnetischen Feldes, z.B. einer Platine, und sind weit weniger kosten- und platzintensiv. Hierbei werden ortsabhängig Nahfeld-Daten aufgenommen. Auf Basis dieser Daten können elektromagnetische Verhaltensmodelle erstellt werden und Nah- und Fernfeldberechnungen durchgeführt werden. Da mit den so ermittelten Modellen gewöhnlich für vereinfachte Bedingungen das Fernfeld bestimmt wird und Antennenmessungen in einer komplexen Messumgebung durchgeführt werden, ist eine Vorhersage der Antennenmesswerte aus den Scan-Daten mit Fehlern verbunden. Es gilt, Korrekturfunktionen zu ermitteln, welche die Störeinflüsse der Umgebung in die Modellberechnungen integrieren. In diesem Beitrag wurde ein Korrekturverfahren vorgestellt, welches die Bestimmung von elektromagnetischen Felddaten in einer realen Messumgebung auf der Basis von Feld-Scan-Daten erlaubt. Dabei wurden auf Messdaten basierende Übertragungsfunktionen, innerhalb eines definierten Korrekturbereichs, zwischen kleinen Stromsegmenten in x-, y- und z-Orientierung und der Messantenne erstellt. Die zuvor ermittelte Stromverteilung auf einer Platine wurde mit diesen Segmenten örtlich korreliert. Die Summe aller Ströme mit ihren zugehörigen Korrekturfunktionen beschreibt die Gesamtantennenspannung. Zur Verifikation der Methode wurden zu erwartende Antennenspannungen in einer realen Messumgebung vorhergesagt und mit Antennenmessungen verglichen. Hierbei wurde sowohl die vertikale als auch die horizontale Feldpolarisation mit Hilfe einer einfachen Teststruktur untersucht. Für beide Polarisationen zeigte sich eine deutliche Verbesserung der Ergebnisse im Vergleich zu einem nicht korrigierten Verhaltensmodell.
Two-dimensional Bloch electrons in perpendicular magnetic fields: an exact calculation of the Hofstadter butterfly spectrum
Creators: name: Janecek, S.
name: Aichinger, M.
name: Hernandez, E. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The problem of two-dimensional, independent electrons subject to a periodic potential and a uniform perpendicular magnetic field unveils surprisingly rich physics, as epitomized by the fractal energy spectrum known as Hofstadter's Butterfly. It has hitherto been addressed using various approximations rooted in either the strong potential or the strong field limiting cases. Here we report calculations of the full spectrum of the single-particle Schrödinger equation without further approximations. Our method is exact, up to numerical precision, for any combination of potential and uniform field strength. We first study a situation that corresponds to the strong potential limit, and compare the exact results to the predictions of a Hofstadter-like model. We then go on to analyze the evolution of the fractal spectrum from a Landau-like nearly-free electron system to the Hofstadter tight-binding limit by tuning the amplitude of the modulation potential.
Photodissociation of carbon dioxide in singlet valence electronic states. II. Five state absorption spectrum and vibronic assignment
Creators: name: Grebenshchikov, Sergy Yu.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The absorption spectrum of CO$_2$ in the wavelength range 120\,nm --- 160\,nm is analyzed by means of quantum mechanical calculations performed using vibronically coupled PESs of five singlet valence electronic states and the coordinate dependent transition dipole moment vectors. The thermally averaged spectrum, calculated for T=190\,K via Boltzmann averaging of optical transitions from many initial rotational states, accurtely reproduces the experimental spectral envelope, consisting of a low and a high energy band, the positions of the absorption maxima, their FWHMs, peak intensities, and frequencies of diffuse structures in each band. Contributions of the vibronic interactions due to Renner-Teller coupling, conical intersections, and the Herzberg-Teller effect are isolated and the calculated bands are assigned in terms of adiabatic electronic states. Finally, diffuse structures in the calculated bands are vibronically assigned using wave functions of the underlying resonance states. It is demonstrated that the main progressions in the high energy band correspond to consecutive excitations of the pseudorotational motion along the closed loop of the CI seam, and progressions differ in the number of nodes along the radial mode perpendicular to the closed seam. Irregularity of the diffuse peaks in the low energy band is interpreted as a manifestation of the carbene-type ćyclic' OCO minimum.
Numerische Untersuchungen zur Auslegung von Präzisionsumformprozessen am Beispiel schrägverzahnter Stirnräder
Creators: name: Neubauer, Ingo
Publisher: name: Hannover : Universität
Year: 2002
Subjects: subject: Precision forging
subject: finite element method
subject: heat treatment
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Itinerant origin of the ferromagnetic quantum critical point in Fe(Ga,Ge)3
Creators: name: Singh, David J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electronic structure and magnetic properties of FeGa3 and doped FeGa3 are studied using density functional calculations. An itinerant mechanism for ferromagnetism is found both for n-type doping with Ge and also for p-type doping. Boltzmann transport calculations of the thermopower are also reported.
Oestrogen-mediated effects on brain chemistry post menopause
Creators: name: Jones, Daniella L.
name: Johal, Zara
name: Kadosh, Kathrin Cohen
name: Violante, Ines R.
Publisher: name: Zenodo
Year: 2023
Subjects: Magnetic Resonance Spectroscopy
Neuroscience
Hormones
Ageing

description: Oestradiol (E2) has been shown to exert a significant influence on neurometabolites in the brain, impacting neurotransmitter synthesis, neurosteroid production, energy metabolism, oxidative stress levels, and neurotransmitter metabolism. However, underrepresentation of women in experimental samples has prevented critical understanding of hormonal fluctuations on neurochemistry, and the capacity of exogenous hormone treatment (HRT) to mediate brain ageing post menopause. Here we employ magnetic resonance spectroscopy (MRS) to investigate the influence of HRT on several brain metabolites, as proxy measures of neural integrity, neuronal/glial membrane turnover and function.
description: {"references": ["Boyle, CP, Raji, CA, Erickson, KI, et al. Estrogen, brain structure, and cognition in postmenopausal women. Hum Brain Mapp. 2021; 42: 24\u2013 35. https://doi.org/10.1002/hbm.25200", "Simpson, R., Devenyi, G. A., Jezzard, P., Hennessy, T. J., & Near, J. (2017). Advanced processing and simulation of MRS data using the FID appliance (FID-A)-An open source, MATLAB-based toolkit. Magnetic resonance in medicine, 77(1), 23\u201333. https://doi.org/10.1002/mrm.26091"]}
Ergebnisse einer neuen Untersuchungsmethode zur Messung der Störempfindlichkeit von Ethernetverbindungen
Creators: name: Kreitlow, Matthias
name: Garbe, Heyno
name: Sabath, Frank
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Durchsatzmessung
subject: Untersuchungsmethode
subject: Störempfindlichkeit
subject: Datenübertragungsrate
subject: lineare Abhängigkeit
subject: Server
subject: Netzwerkprotokoll
subject: Datenübertragung
subject: Störsignal
subject: Paketfehler
subject: Fehlerbild
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: Zur Analyse der Störung von Ethernetverbindungen wurde eine neue Untersuchungsmethode angewandt, die das Verhalten von höheren Netzwerk-Protokollen mit berücksichtigt. Diese hat gezeigt, dass Effekte und Fehlermechanismen auftauchen, die durch einfache Tests mittels Durchsatzmessung mit Hilfe bekannter Anwendungen wie einem FTP-Client/Server nicht aufgedeckt werden können. In keinem untersuchten Fall kam es zu einem nachhaltigen Abbruch der Ethernetverbindung. Dies lässt den Schluss zu, dass in anderen Untersuchungen beobachtete Verbindungsabbrüche nicht durch physikalische Fehler verursacht werden, sondern auf übergeordneten Netzwerk-Schichten entstehen. Dieses konnte beispielhaft durch die Variation der IP-Paketgröße, bei der es sich um einen Software-Parameter handelt, gezielt hervorgerufen werden. Die Ethernetverbindung bleibt jedoch weiterhin bestehen. Der eigentliche Störungsgrad der Verbindung hängt dabei maßgeblich von der Pulswiederholrate (PRF) ab. Hier konnte gezeigt werden, dass es bei einer reinen Störung des Übertragungsweges eine lineare Abhängigkeit der auftretenden Paketfehler zur PRF gibt. Selbst bei 800 Hz ist die Anzahl der Fehler gegenüber der Gesamtzahl an Datenpaketen jedoch so gering, dass sich kein signifikanter Effekt in der Datenübertragungsrate ergeben hat. Hieraus lässt sich schließen, dass die Auswirkungen eines einzelnen Störimpulses auch nur von kurzer Dauer sind, mit einer höheren PRF im kHz-Bereich aber deutlichere Störungen zu erwarten sind. Ein anderes Fehlerbild ergibt sich bei der Störbeaufschlagung von Computern während einer Datenübertragung. Hier konnte mit Hilfe der neuen Untersuchungsmethode festgestellt werden, dass es einen sehr starken Einfluss auf die erzielbare Datenübertragungsgeschwindigkeit gibt. Dieser geht jedoch nicht mit einer höheren Zahl an Paketfehlern einher, sondern liegt in einem verzögerten Senden von Daten durch den Computer begründet, was sogar zu einer Verringerung an gestörten Paketen führt.
Einfluss der Routing-Lage in Via-Arrays auf die Signalqualität bei hohen Datenraten
Creators: name: Müller, Sebastian
name: Brüns, Heinz-D.
name: Schuster, Christian
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Datenrate
subject: Augendiagramm
subject: Teststruktur
subject: Messtechnik
subject: differenzielles Signal
subject: Signalqualität
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: Eine messtechnische und simulatorische Untersuchung zeigt einen deutlichen Einfluss der Routinglage auf die Signalqualität. Eine Auswertung von Augendiagrammen bei einer Datenrate von 25 Gb/s und Übertragung mit einem Signalleiter zeigt für den Fall nicht zurückgebohrter Vias einen durch den Stubeffekt verursachten Unterschied von mehr als 20 % des Eingangsspannungspegels zwischen oberster und unterster Routinglage, wobei die beste Signalqualität auf der untersten Routinglage erreicht wird. Im Falle zurückgebohrter Vias existieren Unterschiede von mehr als 10 % des Eingangsspannungspegels aufgrund der unterschiedlichen Vialängen im Signalpfad, wobei die beste Signalqualität auf der obersten Routinglage erreicht wird. Eine differentielle Signalübertragung bietet für die betrachtete Teststruktur den Vorteil einer geringeren Auswirkung des Stubeffekts, dennoch gelten die zuvor getroffenen Aussagen im Grundsatz auch für die differentielle Übertragung.
Oestrogen-mediated effects on brain chemistry post menopause
Creators: name: Jones, Daniella L.
name: Johal, Zara
name: Kadosh, Kathrin Cohen
name: Violante, Ines R.
Publisher: name: Zenodo
Year: 2023
Subjects: Magnetic Resonance Spectroscopy
Neuroscience
Hormones
Ageing

description: Oestradiol (E2) has been shown to exert a significant influence on neurometabolites in the brain, impacting neurotransmitter synthesis, neurosteroid production, energy metabolism, oxidative stress levels, and neurotransmitter metabolism. However, underrepresentation of women in experimental samples has prevented critical understanding of hormonal fluctuations on neurochemistry, and the capacity of exogenous hormone treatment (HRT) to mediate brain ageing post menopause. Here we employ magnetic resonance spectroscopy (MRS) to investigate the influence of HRT on several brain metabolites, as proxy measures of neural integrity, neuronal/glial membrane turnover and function.
Ni:Si as barrier material for a solderable PVD metallization of silicon solar cells
Creators: name: Jung, Verena
name: Heinemeyer, Frank
name: Köntges, Marc
name: Brendel, Rolf
Publisher: name: London : Elsevier Ltd.
Year: 2013
Subjects: subject: Long-term stability
subject: PVD-metallization
subject: Silicon solar cell
subject: Solder connection
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: We study Ni:Si as a barrier material for the PVD metallization of silicon solar cells and investigate the long term solderability of Al/Ni:Si/Ag metal stacks in terms of peel forces and contact resistances. For this purpose, solar cell connectors are soldered on the Al/Ni:Si/Ag stacks in three different aging states: directly after metallization, after accelerated storage and after storage for six months. The thickness of the Ni:Si layer is varied in these tests. Furthermore we measure the contact resistance between cell interconnect ribbons and the test stack. To assess possible contamination of the Si by the metals we measure the effective lifetime of electron hole pairs during a regularly interrupted thermal treatment procedure. The samples with 200 nm or thicker Ni:Si layers soldered with the lead-containing solder and the flux 952S perform best and pass all tests.
title: Open Access and Open Data in European pre- and protohistory: present situation and outlook
Creators: name: Siegmund, Frank
name: Scherzler, Diane
Publisher: name: University Library Heidelberg
Year: 2015

description: Der Beitrag leitet die Publikation von Aufsätzen ein, die aus zwei Tagungen im Herbst 2014 herrühren, welche sich auf Initiative der Autoren mit den Themen Open Access und Open Data beschäftigten: eine Sektion bei der EAA im September 2014 in Istanbul und die DGUF-Jahrestagung am 6. Oktober 2014 in Berlin. Die übergreifende Zielsetzung wird in diesem Beitrag dargelegt und die Erträge der Vorträge auf diesen Gesamtrahmen bezogen. In einem zweiten Teil versuchen die Autoren, einen Schritt über die aktuellen Debatten hinaus zu denken und mögliche Konsequenzen aus sich abzeichnenden Entwicklungen zu skizzieren. Danach bedeutet der laufende Prozess einer Öffnung der Publikationen weit mehr als das Einstellen von Fachartikeln in das Internet. Vielmehr sind Veränderungsprozesse aus der Wissenschaft in die Öffentlichkeit zu erwarten, wie auch Veränderungsprozesse aus der Öffentlichkeit in die Archäologie hinein.
description: The paper prefaces the publication of essays originating from two conferences in autumn 2014 which were dedicated to the topic Open Access and Open Data at the suggestion of the authors: a section at the EAA in September 2014 in Istanbul and the DGUF Annual Meeting in Berlin on 6 October 2014. The paper sets out the general objective and the fruits of the talks are related to this overall framework. In a second part, the authors attempt to think ahead of the current debates and outline possible consequences from trends which are emerging. It seems that the ongoing process of opening up the publications involves far more than making specialist articles available in the Internet. Rather, changes originating from the world of academia can be expected in the public domain and changes rooted in the public domain can be expected in archaeology.
Long-term stable encapsulated solder joints on an Al/Ni:V/Ag metallization for silicon solar cells
Creators: name: Jung, Verena
name: Heinemeyer, Frank
name: Köntges, Marc
Publisher: name: London : Elsevier Ltd.
Year: 2011
Subjects: subject: Crystalline silicon
subject: Evaporation
subject: Laminate
subject: Long-term stable
subject: Metallization
subject: Solar cell
subject: Solder joint
subject: Sputtering
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Evaporated Al as metallization for silicon solar cells may be profitable as it requires less Al material than the common screen-printed Al/Ag-paste combinations and forms contacts with a lower contact resistivity. To achieve solderability a sputter deposited Ni:V and an Ag layer are deposited onto the evaporated Al layer. Tin-coated Cuconnectors with a lead-free and a lead-containing solder are employed in combination with two halogen-free no-clean fluxes with varying solid contents. The long-term solderability of the metallization stack is demonstrated by comparing 180° peel forces (DIN EN 50461) of Cu-connectors soldered onto the metallization stack directly after preparation, after accelerated storing following IPC J-STD-003B and after storing for half a year at room temperature. The long-term stability of the solder joints is verified by measuring the normalized contact resistivity and by a visual inspection of encapsulated samples during a damp heat test (DIN EN 61215). For encapsulation an EVA foil and a silicone elastomer are used as encapsulation materials. As the lead-containing solder does not adhere sufficiently after accelerated aging, the flux with high contend of solids may accelerate corrosion and the EVA laminates exhibit adhesion problems between the samples and the lamination foil. The lead-free solder and the flux with the lower solid content in a silicone elastomer based laminate emerge to be the most promising candidates for a long term stable interconnection of Al/Ni:V/Ag metallized solar cells.
Juncus capitatus Weigel
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: J. capitatus Weigel Cat. XLIX und353. Für das Wallis ganz zweifelhafte Art. (Ausser der mysteriösen Angabe aus dem Goms [vgl. Cat.] liegt eine nicht minder verdächtige Angabe von Visp vor: leg. GUILLEMIN 1821 in herb. Berlin; vgl. Ascherson Lit. 1904.)
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Zeitbereichs-Nahfeld-Immunitätsprüfung auf PCB-Ebene
Creators: name: Krause, Mario
name: Leone, Marco
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Kalibrier-Verfahren
subject: numerische Simulation
subject: elektrisches Feld
subject: Anwendungsbeispiele
subject: Störfeldstärke
subject: Impulsform
subject: Nahfeld
subject: Testverfahren
subject: Datenrate
subject: Zeitbereich
subject: Leiterplatte
subject: Koppelpfad
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: Das Nahfeld-Immunitätstestverfahren ist ein zusätzliches diagnostisches Werkzeug, um sensitive Bereiche und Koppelpfade auf Leiterplattenebene zu lokalisieren und zu bewerten. Dabei ist es möglich, mit der entsprechenden Feldsonde die Empfindlichkeit gegenüber elektrischen und magnetischen Feldern separat zu testen. Eine Kalibriermethode wurde entwickelt, um Tests mit definierter Feldstärkeamplitude am Prüfling durchführen zu können. Dies ermöglicht eine reproduzierbare Bewertung des Störvermögens unterschiedlicher Impulsformen. Die Kalibriermethode wurde anhand exakter numerischer Feldsimulationen der Einkopplung in eine Leitung validiert. Die Anwendungsbeispiele veranschaulichen den Zusammenhang zwischen Störwirkung und Störfeldstärke, Repetitionsrate, Sondenposition und Signal-Datenrate anhand des Bitfehlerverhältnisses.
title: Zur Problematik der Archivierung archäologischer Funde
Creators: name: Rind, Michael M.
Publisher: name: University Library Heidelberg
Year: 2015

description: Die Archivierung archäologischer Funde in der Bundesrepublik Deutschland ist wegen der Kulturhoheit der Bundesländer nicht einheitlich geregelt. Die Fachämter für Bodendenkmalpflege sind deshalb unterschiedlich ausgestattet und die Verhältnisse mit dem Umgang von Kulturgut aus Ausgrabungen, Surveys und privaten Sammlungen in den einzelnen Bundesländern nicht direkt vergleichbar. Der Autor beschreibt die diesbezüglichen Verhältnisse in Nordrhein-Westfalen auch vor dem Hintergrund der Veränderung der gesetzlichen Grundlagen im Denkmalschutzgesetz seit dem 27. Juli 2013.
description: Because of the cultural sovereignty of the federal states, the archiving of archaeological finds in the Federal Republic of Germany is not uniform. The specialized agencies for archaeological heritage management are set up differently from state to state and the handling of cultural property from excavations, surveys and private collections is not directly comparable. The author describes the situation in North Rhine-Westphalia following the changes to the law on the Protection of Monuments since July 27th, 2013.
El agotamiento de la política en una nueva crisis en Perú
Creators: name: Gudynas, Eduardo
Publisher: name: Zenodo
Year: 2023
Subjects: política
violencia
´necropolítica
agotamiento de la política
modernidad

description: La violencia y la muerte en la crisis política en Perú no son hechos aislados. Se argumenta que se debe a un agotamiento de las formas de entender y concebir la política que son propias de la Modernidad. Ese agotamiento desemboca en una necropolítica.
Quantum discord in nuclear magnetic resonance systems at room temperature
Creators: name: Maziero, J.
name: Auccaise, R.
name: Celeri, L. C.
name: Soares-Pinto, D. O.
name: deAzevedo, E. R.
name: Bonagamba, T. J.
name: Sarthour, R. S.
name: Oliveira, I. S.
name: Serra, R. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review the theoretical and the experimental aspects regarding the quantification and identification of quantum correlations in liquid-state nuclear magnetic resonance (NMR) systems at room temperature. We start by introducing a formal method to obtain the quantum discord and its classical counterpart in systems described by a deviation matrix. Next, we apply such a method to experimentally demonstrate that the peculiar dynamics, with a sudden change behaviour, of quantum discord under decoherence, theoretically predicted only for phase-noise channels, is also present even under the effect of a thermal environment. This result shows that such a phenomena are much stronger than we could think, at principle. Walking through a different path, we discuss an observable witness for the quantumness of correlations in two-qubit systems and present the first experimental implementation of such a quantity in a NMR setup. Such a witness could be very useful in situations were the knowledge of the nature of correlations (in contrast of how much correlations) presented in a given state is enough.
Biosynthesis of galactofuranose containing glycans and their relevance for the pathogenic fungus Aspergillus fumigatus
Creators: name: Schmalhorst, Philipp Sebastian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2009
Subjects: subject: Aspergillus fumigatus
subject: galactofuranose
subject: virulence
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Cracks in solar cell metallization leading to module power loss under mechanical loads
Creators: name: Kasewieter, Jörg
name: Haase, Felix
name: Larrodé, Marta Haro
name: Köntges, Marc
Publisher: name: London : Elsevier Ltd.
Year: 2014
Subjects: subject: Crack width
subject: Mechanical loads
subject: Metallization
subject: Power loss
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: We investigate the mechanisms leading to electrically insulated cell parts in a photovoltaic module under mechanical load. For this we measure the resistances across a crack in a laminated solar cell during bending that is typical in the field. The cracks in the solar cell are detected with electroluminescence imaging. The resistance over the aluminum paste increases continuously by negligible 30 mΩwhereas the front finger resistance increases by 15.4 kΩstepwise. This difference is the result of the higher ductility of the aluminum paste in comparison to the front finger metallization. We associate the steps in the front finger resistance measurement to breakage of single fingers with an equivalent circuit model. Furthermore we found that a silicon crack widths lower 2 μm has no influence on the resistances. Crack widths higher than 7 μm leads to a complete front finger interruption. We determine that the specific resistance of such a crack causes nearly 100% of the power loss, which is caused by a completely electrically insulating crack in a photovoltaic module.
title: Archivieren oder kassieren? Überlieferungsbildung in Archiven
Creators: name: Pilger, Andreas
Publisher: name: University Library Heidelberg
Year: 2015

description: Anknüpfend an Beispiele aus dem Bereich der Archäologie, gibt der Beitrag einen Überblick über die Kriterien der archivischen Bewertung. In diesem Zusammenhang wird die Frage erörtert, inwieweit sich das Alter, die Menge, mögliche Redundanzen, der Aussagewert und die Bedeutung von Unterlagen auf die Entscheidung über die Archivwürdigkeit auswirken. Der Beitrag plädiert abschließend für die Entwicklung von Dokumentationsprofilen, mit denen die einzelnen Archive ihre Schwerpunkte entwickeln und dokumentieren können. Auf dieser Basis wird auch eine Überlieferungsbildung im Dialog mit anderen Archiven möglich.
description: Building on examples from the field of archaeology the paper gives an overview of the criteria of archival appraisal. In this context, the question is discussed to what extent the age, the amount, possible redundancies, the meaningfulness and importance of documents affect the decision on the archival value. The article argues conclusively for the development of documentation strategies with which the individual archives are able to develop and document their priorities. On this basis, a cooperative appraisal in dialogue with other archives is possible.
Determination of corresponding temperature distribution within CFRP during laser cutting
Creators: name: Bluemel, S.
name: Staehr, R.
name: Jaeschke, P.
name: Stute, U.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2013
Subjects: subject: Laser cutting
subject: Temperature distribution
subject: Thermochrome
subject: Thermocouple
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Laser cutting of carbon fiber reinforced plastics as a thermal process results in a thermal load on the material. Due to the high thermal conductivity of carbon fibers, residual heat is conducted along the fibers, away from the laser interaction zone. Common temperature measurement techniques, such as pyrometry and infrared thermography only allow for observation of the temperature development on the surface of the material. In order to achieve information about the temperature distribution within the material during the cutting process, thermochromes and thermocouples were implemented during the laminating process of CFRP. The cutting tests were performed with a single mode fiber laser emitting a continuous wave and at a wavelength of λ = 1080 nm.
title: Einige Bemerkungen zu Christoph Huths Beitrag „Vom rechten Umgang mit Sondengängern“ – die Schleswig-Holsteinische Perspektive
Creators: name: Carnap-Bornheim, Claus Von
name: Ickerodt, Ulf
name: Siegloff, Eicke
Publisher: name: University Library Heidelberg
Year: 2015

description: Christoph Huth verweist im Rahmen seines hier diskutierten Beitrags auf das parallel in England und Wales aufgesetzte Portable Antiquities Scheme (PAS). Dieses Programm will die aktive Teilnahme der Öffentlichkeit an der archäologischen Denkmalpflege fördern. Es richtet sich dabei an SondengängerInnen, die ihre Funde melden und damit der archäologischen Forschung und Denkmalpflege zur Verfügung stellen. Es entspricht in Grundzügen wohl dem Schleswiger-Modell, mit dem an die Tradition des kooperativen Umgangs mit SammlerInnen angeknüpft wird. Mit diesem auf Kooperation ausgerichteten Ansatz werden eine Reihe positiver Effekte erzielt, welche die Tragfähigkeit dieses Modells belegen.
description: In the discussed article Christoph Huth refers to the Portable Antiquities Scheme (PAS), a program established both in England and Wales. The program wants to support the active participation of the public in the archaeological care and preservation of ancient monuments. It is aimed at private metal detectorists who should report their finds and provide thus artefacts to archaeological research and heritage management. In its main features it seems to correspond to the model used in Schleswig (‘Schleswig-Model’), which follows in the tradition of cooperative interaction with the collector. This approach based on cooperation reaches a series of positive effects, verifying the efficiency of this model.
Effects of diode laser superposition on pulsed laser welding of aluminum
Creators: name: Bergmann, J.P.
name: Bielenin, M.
name: Stambke, M.
name: Feustel, T.
name: Witzendorff, P.V.
name: Hermsdorf, J.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2013
Subjects: subject: Aluminium alloy
subject: Cracking
subject: Diodelaser superposition
subject: Laser welding
subject: Nd:YAG laser
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Pulsed laser welding of thin aluminum sheets is common for housing, where welding defects are detrimental especially in terms of hermetic packaging as well as electromagnetic compatibility. This paper shows investigations on laser welding of aluminum by superposition of a pulsed Nd:YAG laser with a diode laser in order to improve the weldability of aluminum. This configuration allows to enhance the absorption of the Nd:YAG welding laser due to preheating by the diode laser. Furthermore the effects of temporal pulse shaping have been studied experimentally. Deeper penetrations as well as an increased weld quality in terms of cracking were observed in welds manufactured with diode laser superposition. Besides this the modification of the thermal cycle by the combination of the two laser beams promotes advantageous solidification conditions and therefore hot cracks were efficiently reduced or avoided. Additionally solidification conditions can be actively influenced. The results show a decreasing number of defects and additionally an increase of the welding quality.
title: Sylvia Crumbach, Zurück zu unserem Cheruskerhof! Anschauliche „Kulturhöhe“ im Germanengehöft auf dem Barkhauser Berg, Oerlinghausen. Kleine Werke zur Archäologie 1. Loogh 2014
Creators: name: Sénécheau, Miriam
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Sylvia Crumbach, Zurück zu unserem Cheruskerhof! Anschauliche „Kulturhöhe“ im Germanengehöft auf dem Barkhauser Berg, Oerlinghausen. Kleine Werke zur Archäologie 1. Loogh: Welt und Erde 2014. 101 Seiten, 20 Abbildungen. Broschiert, ISBN 978-3-938078-15-0. ISSN 2196-7318.
Interfacial Properties of Bilayer and Trilayer Graphene on Metal Substrates
Creators: name: Zheng, Jiaxin
name: Wang, Yangyang
name: Wang, Lu
name: Quhe, Ruge
name: Ni, Zeyuan
name: Mei, Wai-Ning
name: Gao, Zhengxiang
name: Yu, Dapeng
name: Shi, Junjie
name: Lu, Jing
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: One popular approach to prepare graphene is to grow them on transition metal substrates via chemical vapor deposition. By using the density functional theory with dispersion correction, we systematically investigate for the first time the interfacial properties of bilayer (BLG) and trilayer graphene (TLG) on metal substrates. Three categories of interfacial structures are revealed. The adsorption of B(T)LG on Al, Ag, Cu, Au, and Pt substrates is a weak physisorption, but a band gap can be opened. The adsorption of B(T)LG on Ti, Ni, and Co substrates is a strong chemisorption, and a stacking-insensitive band gap is opened for the two uncontacted layers of TLG. The adsorption of B(T)LG on Pd substrate is a weaker chemisorption, with a band gap opened for the uncontacted layers. This fundamental study also helps for B(T)LG device study due to inevitable graphene/metal contact.
description: 1 table, 8 figures
Low-bias electron transport properties of germanium telluride ultrathin films
Creators: name: Liu, Jie
name: Anantram, M. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The nanometer-scale size-dependent electronic transport properties of crystalline (c-) and amorphous (a-) germanium telluride (GeTe) ultrathin films sandwiched by titanium nitride (TiN) electrodes are investigated using ab initio molecular dynamics (AIMD), density functional theory (DFT), and Green's function calculations. We find that a-GeTe ultrathin films scaled down to about 38 Angstrom (12 atomic layers) still shows a band gap and the electrical conductance is mainly due to electron transport via intra-gap states. If the ultrathin films are further scaled, the a-GeTe band gap disappears due to overlap of the two metal induced gap states (MIGS) regions near the TiN electrodes, leading to sharp increase of a-GeTe conductance and significant decrease of c-GeTe/a-GeTe conductance ratio. The c-GeTe/a-GeTe conductance ratio drops below one order of magnitude if the ultrathin films are scaled below about 33 Angstrom, making it difficult to reliably perform read operations in thin film based phase change memory devices. This overlap of the MIGS regions sets up the ultimate scaling limit of phase change memory technology. Our results suggest that the ultimate scaling limit can be pushed to even smaller size, by using phase change material (PCM) with larger amorphous phase band gap than a-GeTe.
Genetic variants in the ABCB1 and ABCG2 gene drugs transporters involved in gefitinib adverse reaction: A Systematic Review and Meta-analysis
Creators: name: Moriel, Patricia
name: Morau, Mariana Vieira
name: Visacri, Marília Berlofa
name: Seguin, Cecília Souto
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences

description: Skin rash, diarrhea and hepatotoxicity are the most common toxicities of Gefitinib, an epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI). Non-small cell lung cancer (NSCLC) is the most common subtype, affecting about 80% of the world population, and the use of TKI has stood out in the last 10 years, being indicated in the first line of treatment. The identification of gene drugs transporters, as possible predictors of adverse reactions to gefitinib in patients, may come to corroborate for the treatment of these patients within the context of personalized medicine. Thus, this systematic review is intended to map and summarize scientific evidence, based on a literature review, on the genetic predictors involved in gefitinib toxicity.
The vertical structure of Jupiter's equatorial zonal wind above the cloud deck, derived using mesoscale gravity waves
Creators: name: Watkins, C.
name: Cho, J. Y-K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Data from the Galileo Probe, collected during its descent into Jupiter's atmosphere, is used to obtain a vertical profile of the zonal wind from $\mathbf{\sim 0.5}$ bar (upper troposphere) to $\mathbf{\sim 0.1\, μ{bar}}$ (lower thermosphere) at the probe entry site. This is accomplished by constructing a map of gravity wave Lomb-Scargle periodograms as a function of altitude. The profile obtained from the map indicates that the wind speed above the visible cloud deck increases with height to $\mathbf{\sim 150}$ m\,s$\mathbf{^{-1}}$ and then levels off at this value over a broad altitude range. The location of the turbopause, as a region of wide wave spectrum, is also identified from the map. In addition, a cross-equatorial oscillation of a jet, which has previously been linked to the quasi-quadrennial oscillation in the stratosphere, is suggested by the profile.
description: 5 pages, 4 figures. Accepted for publication in GRL
Magnetically Active Stars in Taurus-Auriga: Activity and Rotation
Creators: name: Grankin, K. N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A sample of 70 magnetically active stars toward the Taurus-Auriga star-forming region has been investigated. The positions of the sample stars on the Rossby diagram have been analyzed. All stars are shown to be in the regime of a saturated dynamo, where the X-ray luminosity reaches its maximum and does not depend on the Rossby number. A correlation has been found between the lithium line equivalent width and the age of a solar-mass (from 0.7 to 1.2 Msun) pre-main-sequence star. The older the age, the smaller the Li line equivalent width. Analysis of the long-term photometric variability of these stars has shown that the photometric activity of the youngest stars is appreciably higher than that of the older objects from the sample. This result can be an indirect confirmation of the evolution of the magnetic field in pre-main-sequence stars from predominantly dipole and axisymmetric to multipole and nonaxisymmetric.
description: 16 pages with 8 Postscript figures
Fractional Flux Quantization in Loops of Unconventional Superconductors
Creators: name: Loder, Florian
name: Kampf, Arno P.
name: Kopp, Thilo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The magnetic flux threading a conventional superconducting ring is typically quantized in units of $Φ_0=hc/2e$. The factor 2 in the denominator of $Φ_0$ originates from the existence of two different types of pairing states with minima of the free energy at even and odd multiples of $Φ_0$. Here we show that spatially modulated pairing states exist with energy minima at fractional flux values, in particular at multiples of $Φ_0/2$. In such states condensates with different center-of-mass momenta of the Cooper pairs coexist. The proposed mechanism for fractional flux quantization is discussed in the context of cuprate superconductors, where $hc/4e$ flux periodicities as well as uniaxially modulated superconducting states were observed.
description: 5 pages, 3 figures
Tunneling electron induced rotation of a copper phthalocyanine molecule on Cu(111)
Creators: name: Schaffert, J.
name: Cottin, M. C.
name: Sonntag, A.
name: Bobisch, C. A.
name: Moeller, R.
name: Gauyacq, J. -P.
name: Lorente, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The rates of a hindered molecular rotation induced by tunneling electrons are evaluated using scattering theory within the sudden approximation. Our approach explains the excitation of copper phthalocyanine molecules (CuPc) on Cu(111) as revealed in a recent measurement of telegraph noise in a scanning tunneling microscopy (STM) experiment [Schaffert \textit{et al.}, Nat. Mat. {\bf 12}, 223 (2013)]. A complete explanation of the experimental data is performed by computing the geometry of the adsorbed system, its electronic structure and the energy transfer between tunneling electrons and the molecule's rotational degree of freedom. The results unambiguously show that tunneling electrons induce a frustrated rotation of the molecule. In addition, the theory determines the spatial distribution of the frustrated rotation excitation, confirming the striking dominance of two out of four molecular lobes in the observed excitation process. This lobe selectivity is attributed to the different hybridizations with the underlying substrate.
description: 10 pages, 6 figures
Electron and hole trap signal with similar defect parameters in chalcopyrite based solar cells
Creators: name: Mertens, Verena
name: Reineke-Koch, Rolf
name: Parisi, Jürgen
Publisher: name: Berlin : De Gruyter
Year: 2009
Subjects: subject: Defect scpectroscopy
subject: Thin film photovoltaic
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Copper chalcopyrite based solar cells with different molar gallium to gallium plus indium ratio (GGI) are looked at, using deep level transient spectroscopy (DLTS) and admittance spectroscopy (AS). Depending on the respective measurement parameters, like reverse bias level, height and length of the voltage pulse applied, either a minority carrier or/and a majority carrier deep level signal is/are detected in the temperature range below 200 K. The AS investigations reveal only one trap signal. After a detailed description of the defect properties taking advantage of the two diode model, we discuss the origin of these trap signals in view of our experimental findings.
title: Принципы лечения и фармацевтическое консультирование при острой диарее
Creators: name: Оконенко, Татьяна
name: Антропова, Галина
name: Новикова, Анастасия
name: Гемаева, Мака
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: Выделены актуальные вопросы при консультировании больных с диареей аптечным специалистом и определено место пробиотиков в лечении острой диареи. Рассмотрены основные причины развития диареи. Выделены основные направления фармакокоррекции острой диареи, среди которых: устранение дегидратации (растворы для регидратации); предупреждение дальнейшей потери жидкости: (антидиарейные средства); этиотропная терапия ДП (антибактериальные и антипротозойные средства); дезинтоксикация организма (энтеросорбенты и терапия пробиотиками). Для лечения больных предпочтительны пробиотики, заключенные в кислотоустойчивую капсулу. На фармацевтическом рынке России только Бифиформ выпускается в форме капсул кишечнорастворимых. Предложен алгоритм консультирования аптечным специалистом больного диареей. Основополагающим при осуществлении фармацевтического консультирования является выяснение возраста больного, угрожающих симптомов, при наличии которых фармацевтический специалист не сможет дать адекватную оценку состояния больного и осуществить рекомендацию ЛП.