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Search Results: 1 - 10 of 3771 matches for " Lukas Klein "
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Novel Wien Bridge Oscillator Design Using Functional Block Structure with Current Conveyors
Pavel Brandstetter,Lukas Klein
Advances in Electrical and Electronic Engineering , 2012,
Abstract: The purpose of this paper is to generally present possibilities of the current conveyor use in the well-known active electronic circuits. Current conveyors are able to substitute all known active elements. This claim is supported by the fact, that four basic functional block structures can be realized by use of current conveyors - voltage-controlled voltage source, voltage-controlled current source, current-controlled current source and current-controlled voltage source. The paper presents particular example of use of functional block structure with current conveyors in Wien bridge oscillator, where it successfully substitutes operational amplifier on the place of active element. Both theoretical formulae and design description are given. Finally, OrCAD PSpice simulation results are presented.
Third Order Low-Pass Filter Using Synthetic Immittance Elements with Current Conveyors
Pavel Brandstetter,Lukas Klein
Advances in Electrical and Electronic Engineering , 2012,
Abstract: The paper deals with a theoretical proposal of the resulting circuit of the frequency filter using synthetic immittance elements of higher order with current conveyors. The text pays particular attention to design process of synthetic immittance elements, explains the principle of increasing of order, which is then reflected to the frequency filter order. The text then deals less with the theory of current conveyors, which has already been discussed, in detail, in previous papers. Universal current conveyor (UCC) is discussed more. This active element is used for the theoretical implementation of the synthetic element solution used in the frequency filter. The theoretical knowledge is then demonstrated in the design of 3rd order low-pass frequency filter. The final functionality of the proposed frequency filter circuit solution is validated by PSpice simulation.
Second Order Low-Pass and High-Pass Filter Designs Using Method of Synthetic Immitance Elements
Pavel Brandstetter,Lukas Klein
Advances in Electrical and Electronic Engineering , 2013,
Abstract: The paper briefly describes the basics of frequency filter design method using synthetic immittance elements with current conveyors. An introduction of the paper explains the advantages and also disadvantages of using this method. Other chapters briefly introduce a design process of simple second order low-pass and high-pass filter. A theory of current conveyors is discussed too, because they are the basic building blocs of proposed synthetic element and also active frequency filters. Finally, the particular solutions of low-pass and high-pass filters are given and verified by OrCAD PSpice simulations.
What does the “arrow of time” stand for?  [PDF]
Etienne Klein
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.23033
Abstract: One hundred and thirty years after the work of Ludwig Boltzmann on the interpretation of the irreversibility of physical phenomena, and one century after Einstein's formulation of Special Relativity, we are still not sure what we mean when we talk of “time” or “arrow of time”. We shall try to show that one source of this difficulty is our tendency to confuse, at least verbally, time and becoming, i.e. the course of time and the arrow of time, two concepts that the formalisms of modern physics are careful to distinguish. The course of time is represented by a time line that leads us to define time as the producer of duration. It is customary to place on this time line a small arrow that, ironically, must not be confused with the “arrow of time”. This small arrow is only there to indicate that the course of time is oriented, has a well-defined direction, even if this direction is arbitrary. The arrow of time, on the other hand, indicates the possibility for physical systems to experience, over the course of time, changes or transforma-tions that prevent them from returning to their initial state forever. Contrary to what the ex-pression “arrow of time” suggests, it is there-fore not a property of time itself but a property of certain physical phenomena whose dynamic is irreversible. By its very definition, the arrow of time presupposes the existence of a well- established course of time within which – in addition – certain phenomena have their own temporal orientation. We think that it is worth-while to emphasize the difference between sev-eral issues traditionally subsumed under the label “the problem of the direction of time”. If the expressions “course of time”, “direction of time” and “arrow of time” were better defined, systematically distinguished from one another and always used in their strictest sense, the debate about time, irreversibility and becoming in physics would become clearer.
Expedient syntheses of the N-heterocyclic carbene precursor imidazolium salts IPr·HCl, IMes·HCl and IXy·HCl
Hintermann Lukas
Beilstein Journal of Organic Chemistry , 2007, DOI: 10.1186/1860-5397-3-22
Abstract: The 1,3-diaryl-imidazolium chlorides IPr·HCl (aryl = 2,6-diisopropylphenyl), IMes·HCl (aryl = 2,4,6-trimethylphenyl) and IXy·HCl (aryl = 2,6-dimethylphenyl), precursors to widely used N-heterocyclic carbene (NHC) ligands and catalysts, were prepared in high yields (81%, 69% and 89%, respectively) by the reaction of 1,4-diaryl-1, 4-diazabutadienes, paraformaldehyde and chlorotrimethylsilane in dilute ethyl acetate solution. A reaction mechanism involving a 1,5-dipolar electrocyclization is proposed.
Kohap rimuslik luule n dalalehes Das Inland / Die Sagendichtung in der Wochenschrift Das Inland
Liina Lukas
?petatud Eesti Seltsi Aastaraamat/Yearbook of the Learned Estonian Society , 2012,
Abstract: Das sp tromantische Interesse für Ortsüberlieferungen, angeregt von den “Deutschen Sagen” (1816–1818) der Brüder Grimm, blühte im Baltikum in den 1830er und 1840er Jahren auf und gipfelte – im estnischen Sprachgebiet – in der zweisprachigen Ausgabe des estnischen Nationalepos “Kalevipoeg” / “Kalew’s Sohn” (1857–1861), dem Friedrich Reinhold Kreutzwald seine Endgestalt gab, aber das von mehreren Sammlern und Bearbeitern gepr gt wurde. Literarische Bearbeitungen von Volkssagen fanden schnell ihren Weg in Zeitungen und Zeitschriften, in Gedichtb nde und Anthologien – oft in modischer Balladenform, die dem mythisch-romantischen Inhalt der Volkssage am besten zu entsprechen schien. Die Blütezeit der Sagendichtung im Baltikum sind die 1840er Jahre, als vor allem in der Zeitschrift Das Inland“ mehrere dichterischen Bearbeitungen estnischer und lettischer Volkssagen erschienen (von Heinrich Blindner, Otto Dreistern, Eduard Pabst, Minna von M dler, Theodor Rutenberg, Robert Falck, P. Otto u. a.) 1845 erschien hier das nach einer Sage von Friedrich Robert Faehlmann verfasste Gedicht Koit und H marik / Morgenroth und Abendroth“ von Minna von M dler – fünf Jahre vor der Fassung von Friedrich Reinhold Kreutzwalds estnischsprachiger Ballade Koit ja H marik“. Zwischen 1831 und 1836 verfasste Friedrich Reinhold Kreutzwald seine deutschsprachigen Balladen, von denen Die Belagerung von Bewerin im Jahre 1207“ 1846 im Inland“ gedruckt wurde. Das Jahr 1846 kann als Balladenjahr“ der Zeitschrift bezeichnet werden. Die eigentliche Dom ne der deutschbaltischen (lyro-)epischen Dichtung ist die historische Ballade, die fu end auf baltischen Chroniken und Familiengeschichten zumeist von Ruinen alter Schl sser und den sie einst bewohnenden historischen Personen und deren Heldentaten berichtet. Doch schon im Jahre 1847 kann man im Inland die Kritik gegenüber diesem Balladenboom vernehmen, u.a. mit dem Argument, dass die livl ndische Geschichte zu wenig Gro artiges für einen Dichter b te. Zur stofflichen Erweiterung bot sich das estnische und lettische Sagengut an – eine Fundgrube von Motiven, aus der man sich nach dem Zeitgeschmack frei bedienen konnte. Dieser Adaptionsdrang regt seinerseits estnische Literatur an, die ihren Weg im Strome der deutschbaltischen Lyroepik findet. Der estnisch-deutsche Kulturtransfer ist nie intensiver gewesen als in dieser Balladen ra.
Ylva Greve, Verbrechen und Krankheit. Die Entdeckung der Criminalpsychologie im 19. Jahrhundert
Lukas Gschwend
Forum Historiae Iuris , 2005,
Abstract:
Adorno, Obama, and Empire: Reflections on the U.S. Presidential Election and the Next President
Lukas Kaelin
Kritike : an Online Journal of Philosophy , 2008,
Abstract: As tempting as it might be, politics is a difficult field for philosophers.Well known are Plato’s and Heidegger’s attempt to influence the political developments of their time, which went badly wrong. Much safer is it to provide an interpretation of current political events, which is the aim of this paper. The paper attempts to philosophically assess the recent U.S. presidential race and to look at some aspects of the underlying beliefs of Barack Obama that aided him in his campaign. The philosophical framework used in order to interpret the political events are mainly from the Critical Theory of Theodor W. Adorno and the neo-Marxist approach of Michael Hardt and Antonio Negri. Further observations will concentrate on the logic and attraction of the electoral process and the dialectical logic of Sarah Palin’s statements. The first part will discuss the form of U.S. electoral politics, especially the perpetual campaign, whereas the second part will put the policiesof the next U.S. president into a philosophical context.
ON SELECTED ASPECTS OF CRIMINAL LIABILITY OF LEGAL ENTITIES IN THE LEGAL SYSTEMS OF VARIOUS EUROPEAN COUNTRIES
LUKAS BOHUSLAV
Ad Alta : Journal of Interdisciplinary Research , 2011,
Abstract: Criminal liability of legal entities has been a modern and topical institutionas well as a controversial issue at legal, political and social levels not only in theCzech Republic but also in other European countries. This article briefly describesselected aspects of criminal liability of legal entities – questions of the extent ofcriminalization and sanctioning of criminal liability of legal entities – and focuses onthe regulation of this institution in the legal systems of selected European countries. Italso outlines the above-mentioned questions as they are treated in the proposed draftlaw to regulate criminal liability of legal entities and proceedings against them in theCzech Republic introduced in the Czech Republic in 2011.
RFID Signal Denoising - Experiments with Neural Network
Lukas Vojtech
Advances in Electrical and Electronic Engineering , 2010,
Abstract: Radio Frequency Identification signal denoising can be a perspective method for the future intelligent Radio Frequency Identification readers with high reading distances capability. This paper deals with the Group Method of Data Handling neural network denoising filter experiments. Capability of the probability learning of the Group Method of Data Handling filters is an effective instrument in more exacting applications in comparison with classical Finite Impulse Response filters. Results show that the realized experiment can be a perspective method for Radio Frequency Identification signal processing.
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