506 research outputs found
Oscylacje na ciekłej elektrodzie galowej
No full textDas Phänomen des pulsierenden Quecksilberherzens ist seit etwa 200 Jahren bekannt. In
einem kürzlich erschienenen Artikel konnten wir eine vollständige Erklärung dieses faszinierenden
Phänomens liefern, in der wir uns ausschließlich auf das Phänomen der Elektrokapillarität stützen.
Ausgehend von den Ergebnissen zum pulsierenden Quecksilberherz untersuchten wir das
Galliumsystem. Es war anzunehmen, daß auch in diesem System sichtbare Oszillationen
hervorgerufen werden können, deren ursächliches Zustandekommen ebenso mithilfe der
Elektrokapillarität erklärt werden kann. Dennoch mußten die Oszillationsbedingungen gänzlich
andere sein, da Gallium (und seine Verbindungen) andere elektrochemische Potentiale ausbildet als
Quecksilber. Mit der Zugrundelegung der Theorie der Elektrokapillarität gelang es, die
Bedingungen für das pulsierende Galliumherz unter verschiedenen Bedingungen zu finden und eine
befriedigende Erklärung der Vorgänge mithilfe der Elektrokapillarität zu geben. Darüber hinaus
fanden wir unerwartet eine völlig neue Oszillationsart, deren Zustandekommen keinerlei weitere
Elektroden erfordert. Dieses eigenartige, vielleicht als „Eigenoszillation“ zu bezeichnende
Phänomen, wird in naher Zukunft untersucht werden.The phenomenon of the so-called beating mercury heart is known since about 200 years.
We recently inspected it and gave a satisfying explanation by using only the phenomenon
of electrocapillarity. Turning out from this phenomenon of the beating mercury heart we
examined the gallium system. Complying with the terms from the known system it was to be
expected to obtain visible electrocapillaric caused oscillation likewise. Nevertheless the terms
of obtaining oscillations needed to be completely different because of the rearranged
electrochemical potential from gallium compared to the electrochemical potential from
mercury. Applying the base of electrocapillarity it succeed to find out the terms of oscillation from the beating gallium heart under various preconditions and to give a satisfying explanation
by using the phenomenon of electrocapillarity. Moreover there was discovered a new sort of
oscillation without use of any additional electrode material. These peculiar “self-driven
oscillations” will have to be examined in the near future.Zjawisko oscylacji kropli rtęci znane jako „bijącego serce rtęci” zaobserwowano już prawie
200 lat temu. W pracy podjęto udaną próbę scharakteryzowania, w podobny sposób zachowania się
ciekłego galu w wodnych roztworach różnych elektrolitów o różnych stężeniach. W układzie
pomiarowym zastosowano elektrodę platynową jako elektrodę polaryzującą, natomiast jako
elektrody pomocnicze stosowano aluminium, platynę lub czerń platynową. Krzywe polaryzacyjne
analizowano za pomocą odpowiednio zaprogramowanego komputera. Krzywa elektrokapilarna,
wykazuje maksimum w potencjale ładunku zerowego, a określonym wartościom potencjałów
polaryzacji towarzyszą oscylacje potencjału elektrody galowej, w dużym stopniu analogiczne do
znanych oscylacji kropli rtęci. Oscylacje kropli galowej wykazują większą częstotliwość w
porównaniu z rtęcią, a towarzyszący im tzw. potencjał ciszy jest zbliżony do potencjału ładunku
zerowego galu. Zjawisko to zostało wytłumaczone zróżnicowaną gęstością ładunku wewnątrz
elektrody i w otaczającym ją elektrolicie. Powoduje to cykliczne ładowanie-rozładowanie tak
wytworzonego kondensatora kulistego, co uwidocznione jest w cyklicznych impulsach
potencjałowych, których kształt zależy od rodzaju i stężenia elektrolitu.Zadanie pt. Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę
Zur Entwicklung innovativer Unterrichtskonzeptionen auf der Basis kooperativer Lernformen für den Chemieunterricht der Sekundarstufe I unter besonderer Berücksichtigung multimedialer Lernhilfen ein Projekt partizipativer Aktionsforschung
No full textEntwicklung einer schnellen Pulsformanalyse für asymmetrische AGATA-Germanium-Detektoren
No full textOnTEAM metadata: GDSID: DOC-2007-May-32; Attribute ID: LIBRARY-thesis_diss-2007-005; Title: [GSI Diss 2007-05] Entwicklung einer schnellen Pulsformanalyse für asymmetrische AGATA-Germanium-Detektoren; Author(s): Beck, Torsten; Corporate author(s): ; Publication date: 20070501; Creator: manton; Creation date: 15.05.2007 16:02:12; Change date: 29.10.2008 16:29:34; Access: nur berechtigte Gruppen; Attribute type: Text.Thesis.Diss; Directory path: ['GSI Publications', 'GSI as Publisher']; Attribute path: ['Infrastructure', 'Library and Documentation', 'thesis_diss', 'Added in 2007']; File name(s): ['DOC-2007-May-32-1.pdf']; File title(s): ['']; File access: ['nur berechtigte Gruppen'
Manifolds, sheaves, and cohomology
No full textThis book explains techniques that are essential in almost all branches of modern geometry such as algebraic geometry, complex geometry, or non-archimedian geometry. It uses the most accessible case, real and complex manifolds, as a model. The author especially emphasizes the difference between local and global questions. Cohomology theory of sheaves is introduced and its usage is illustrated by many examples. Content Topological Preliminaries - Algebraic Topological Preliminaries - Sheaves - Manifolds - Local Theory of Manifolds - Lie Groups - Torsors and Non-abelian Cech Cohomology - Bundles - Soft Sheaves - Cohomology of Complexes of Sheaves - Cohomology of Sheaves of Locally Constant Functions - Appendix: Basic Topology, The Language of Categories, Basic Algebra, Homological Algebra, Local Analysis Readership Graduate Students in Mathematics / Master of Science in Mathematics About the Author Prof. Dr. Torsten Wedhorn, Department of Mathematics, Technische Universität Darmstadt, Germany
James Watson, Maclyn McCarty, and Torsten Wiesel
Get PDFTorsten Wiesel (right) with Professor Emeritus Maclyn McCarty (center), co-author of the paper with Oswald Avery and Colin MacLeod, and James D. Watson, director of Cold Spring Harbor Laboratory, 1994
Photo by Leif Carlsson
To commemorate the fiftieth anniversary of the discovery at The Rockefeller University that genes are made of DNA - considered by many to be the single most important biological discovery of the twentieth century - the university has kicked off a year-long series of events that were running through May 1994. The celebration was formally inaugurated in November 1993 with a lecture by Nobel laureate James D. Watson, best known for discovering the double-helical structure of DNA.
See also Search Winter 1994, vol. 4, no. 1https://digitalcommons.rockefeller.edu/group-portraits/1013/thumbnail.jp
Seltsame Schauspiele. Torsten Fogelqvists Deutschlandreise 1934
No full textIn 1934 Torsten Fogelqvist, a prominent member of the Swedish Academy and a well-known journalist and intellectual, visits Nazi Germany. He writes about his visit to the Third Reich in 17 articles published in the Stockholm daily newspaper Dagens Nyheter. The author, highly critical of the Hitler regime, scrutinizes several aspects of the nazified German society such as the attempts to re-educate the German citizen in accordance with the ideology of the new regime, the hero cult in the Nazi movement, and the relationship between the German state and the churches. In order to further an understanding of political and social developments in Germany Fogelqvist uses a specific strategy. He “translates” them into an imaginary Swedish context. This paper compares his views with those of other Swedish visitors
PISM glacial cycle sensitivity experiments of the Antarctic Ice Sheet
No full textThis dataset contains PISM simulation results (http://www.pism-docs.org) of the Antarctic Ice Sheet based on code release v1.0-paleo-ensemble (https://doi.org/10.5281/zenodo.3574033). PISM is the open-source Parallel Ice Sheet Model developed mainly at UAF, USA and PIK, Germany.
With the help of added python scripts, all figures can be reproduced as in the journal publication:
- Albrecht et al., 2020, doi:10.5194/tc-14-599-2020.
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Data:
Find PISM results as netCDF data. See 'README.md' for a list of all performed experiment.
All forcing input data for the experiments and plots can be downloaded and remapped via https://github.com/pism/pism-ais. Some of the original input data files are freely available, for others please contact the author or the corresponding data publisher.
Figure plotting scripts (jupyter notebook based on python, see https://jupyter.org) in 'plot_scripts' access the uploaded PISM results in 'model_data' and save the plots to 'final_figures'. Jupyter notebook can be run in the browser and shared, see https://nbviewer.jupyter.org/url/www.pik-potsdam.de/~albrecht/notebooks/paleo_paper/paleo_paper_final.ipynb.
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Contact:
Albrecht, Torsten ([email protected]) ; Potsdam-Institute for Climate Impact Research (PIK), Potsdam, German
Die Erfolgsfaktoren für unternehmerisches E-Mail-Marketing nach Dr. Torsten Schwarz am Praxisbeispiel ERGOTOPIA GmbH
Get PDFThis scientific document reveals the results of an empirical examination within the realm of entrepreneurial e-mail-marketing which is based on a literature review by technical author Dr. Torsten Schwarz. Using the start-up company ERGOTOPIA as a practical example, the author of the master thesis investigates whether the explanations of Dr. Schwarz match with the practical implementation of ERGOTOPIA.
Precisely, the scientific paper focuses on the examination of the four aspects lead generation, newsletter-design, software-requirements and performance measurement through monitoring with regard to successful realization of e-mail-marketing campaigns. The empirical part of this examination is made of the introduction as well as the analysis of two conducted so called split-tests that compare specific aspects of the newsletter-design and measure data-driven results to show which kind of aspect produced the more successful campaign.
This way the author proves whether the recommendations by Dr. Schwarz are practically relevant for the company ERGOTOPIA
Invitation to Dialogue - A Progress Report
No full textFragmentation of knowledge and life milieux, so often associated with specialization in science and planning, provided the broad challenge in science and planning, provided the broad challenge for a DIALOGUE PROJECT initiated by Torsten Hägerstrand and Anne Buttimer in Sweden during the Academic Years 1977-1979. The initial incentive for confronting such a wide-ranging set of issues arose from a paper on Values in Geography (Buttimer, 1974), after which the author was invited as a Fulbright lecturer to offer a series of seminars in Lund on problems of knowledge and experience. More than forty participants from ten widely different disciplines took part in this seminar, and foundations were laid for an experientially-grounded approach to the problems of communication across disciplines. The present project was initiated when Anne Buttimer was invited to accept a full time position in Sweden by the Humanistisk-Samhällsvetenskapliga Forskningsrådet (Council for Humanities and Social Science) in 1977. Financial support for this pilot phase of the Dialogue Project was granted by the Swedish Committee for Future Oriented Research and the Bank of Sweden Tercentenary Foundation. The geography department at the University of Lund continues to provide material and administrative help, with Torsten Hägerstrand as Co-Director
Invitation to Dialogue - A Progress Report
No full textFragmentation of knowledge and life milieux, so often associated with specialization in science and planning, provided the broad challenge in science and planning, provided the broad challenge for a DIALOGUE PROJECT initiated by Torsten Hägerstrand and Anne Buttimer in Sweden during the Academic Years 1977-1979. The initial incentive for confronting such a wide-ranging set of issues arose from a paper on Values in Geography (Buttimer, 1974), after which the author was invited as a Fulbright lecturer to offer a series of seminars in Lund on problems of knowledge and experience. More than forty participants from ten widely different disciplines took part in this seminar, and foundations were laid for an experientially-grounded approach to the problems of communication across disciplines. The present project was initiated when Anne Buttimer was invited to accept a full time position in Sweden by the Humanistisk-Samhällsvetenskapliga Forskningsrådet (Council for Humanities and Social Science) in 1977. Financial support for this pilot phase of the Dialogue Project was granted by the Swedish Committee for Future Oriented Research and the Bank of Sweden Tercentenary Foundation. The geography department at the University of Lund continues to provide material and administrative help, with Torsten Hägerstrand as Co-Director
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