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Search Results: 1 - 10 of 10981 matches for " Morgenstern Jr. "
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Three-dimensional supersonic flow over a spike-nosed body of revolution
Morgenstern Jr., A.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000400004
Abstract: the unsteady, viscous, supersonic flow over a spike-nosed body of revolution is numerically investigated by solving the navier-stokes equations. the time-accurate computations are performed employing an implicit algorithm based on the second-order time-accurate lu-sgs scheme with the incorporation of a subiteration procedure to maintain time accuracy. the characteristics of the flow field for a mach number of 3.0, reynolds number of 7.87 x 106/m, and angles of attack of 5 and 10 degrees are described. self-sustained asymmetric shock wave oscillations were observed in the numerical computations for these angles of attack. the main characteristic of the flow field, as well as its influence on drag coefficient is discussed.
Three-dimensional supersonic flow over a spike-nosed body of revolution
Morgenstern Jr. A.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: The unsteady, viscous, supersonic flow over a spike-nosed body of revolution is numerically investigated by solving the Navier-Stokes equations. The time-accurate computations are performed employing an implicit algorithm based on the second-order time-accurate LU-SGS scheme with the incorporation of a subiteration procedure to maintain time accuracy. The characteristics of the flow field for a Mach number of 3.0, Reynolds number of 7.87 x 10(6)/m, and angles of attack of 5 and 10 degrees are described. Self-sustained asymmetric shock wave oscillations were observed in the numerical computations for these angles of attack. The main characteristic of the flow field, as well as its influence on drag coefficient is discussed.
Experimental results from the sounding vehicle Sonda III test campaign in the Pilot Transonic Wind Tunnel
Jo?o Batista P. Falc?o Filho,Maria Luísa Collucci C. Reis,Algacyr Morgenstern Jr.
Journal of Aerospace Technology and Management , 2011,
Abstract: The Pilot Transonic Wind Tunnel of the Institute of Aeronautics and Space has conducted the first test campaign of a sounding vehicle, Sonda III. The campaign is part of a project whose activities and final results are presented in this paper. During the test campaign, many activities were performed to increase the productivity and accuracy of the tunnel. These activities included calibration procedures, corrective and preventive trials, development of auxiliary devices, and theoretical and experimental analysis. Two tasks are described in details: the development and tests performed with the static pressure probe and the automatic re-entry flap actuation system. Several tests were carried out with the Sonda III at Mach numbers ranging from 0.3 to 1.0, at stagnation pressures of 70, 94, and 110 kPa. Experimental results include global aerodynamic coefficients (using internal balance) and pressure distribution over essential regions of the test article (using pressure sensitive paint technique).
Grupos organizados y partidos desorganizados: incentivos electorales en Uruguay Organized factions and disorganized parties: electoral incentives in Uruguay
Scott MORGENSTERN
América Latina Hoy , 2010,
Abstract: El presente artículo aplica el estudio de la organización de partidos y el voto legislativo a sistemas de partidos con facciones. Tras desarrollar una clasificación de los diferentes tipos de facciones, se argumenta que las facciones jerárquicamente organizadas responden a un sistema competitivo de incentivos. Pese a que las facciones tienen intereses que las empujan a trabajar juntas por el bien del partido, al mismo tiempo, tienen interés en diferenciarse unas de otras por propósitos electorales. Además, el ciclo electoral dirige los pesos de estas presiones competitivas provocando la ruptura en la cooperación entre las facciones conforme se aproximan las elecciones. Estas pautas e incentivos son particularmente evidentes en el caso de Uruguay, por lo que el artículo utiliza datos del voto nominal del Legislativo del país para probar estos argumentos. This paper extends the study of party organization and legislative voting to factionalize party systems. After developing a typology of factional types, it argues that hierarchically organized factions respond to a competing incentive system. Factions have interests that push them to work together for the good of the party, but at the same time, they have interests in distinguishing themselves for electoral purposes. Further, the electoral cycle drives the weights of these competing pressures, leading factional cooperation to break down as elections near. These patterns and incentives are particularly evident in Uruguay, and the paper uses roll-call data from that country's legislature to test the propositions
3D Analysis-suitable T-splines: definition, linear independence and m-graded local refinement
Philipp Morgenstern
Mathematics , 2015,
Abstract: This paper addresses the linear independence of T-splines in three space dimensions. We give an abstract definition of analysis-suitability, and prove that it is sufficient for linear independence of the T-spline blending functions. In addition, we present a local refinement algorithm that generates analysis-suitable meshes and has linear computational complexity in terms of the number of marked and generated mesh elements.
Scanning Tunneling Microscopy and Spectroscopy of Graphene on Insulating Substrates
Markus Morgenstern
Statistics , 2012, DOI: 10.1002/pssb.201147312
Abstract: Graphene is a truly two-dimensional material with exceptional electronic, mechanical, and optical properties. As such, it consists of surface only and can be probed by the well developed surface-science techniques as, e.g., scanning tunneling microscopy. This method bridges the gap between the surface science community and the electronic device community and might lead to novel combined approaches. Here, I review some of the scanning tunneling microscopy (STM) and spectroscopy (STS) experiments on monolayer graphene samples. I will concentrate on graphene samples deposited on insulating substrates, since these are related to graphene device concepts. In particular, I will discuss the morphology of graphene on SiO$_2$ and other emerging substrates, some nanomechanical manipulation experiments using STM, and spectroscopic results. The latter can map the disorder potentials as well as the interaction of the electrons with the disorder which is most pronounced in the quantum Hall regime.
A LTL Fragment for GR(1)-Synthesis
Andreas Morgenstern,Klaus Schneider
Electronic Proceedings in Theoretical Computer Science , 2011, DOI: 10.4204/eptcs.50.3
Abstract: The idea of automatic synthesis of reactive programs starting from temporal logic (LTL) specifications is quite old, but was commonly thought to be infeasible due to the known double exponential complexity of the problem. However, new ideas have recently renewed the interest in LTL synthesis: One major new contribution in this area is the recent work of Piterman et al. who showed how polynomial time synthesis can be achieved for a large class of LTL specifications that is expressive enough to cover many practical examples. These LTL specifications are equivalent to omega-automata having a so-called GR(1) acceptance condition. This approach has been used to automatically synthesize implementations of real-world applications. To this end, manually written deterministic omega-automata having GR(1) conditions were used instead of the original LTL specifications. However, manually generating deterministic monitors is, of course, a hard and error-prone task. In this paper, we therefore present algorithms to automatically translate specifications of a remarkable large fragment of LTL to deterministic monitors having a GR(1) acceptance condition so that the synthesis algorithms can start with more readable LTL specifications.
Exploiting the Temporal Logic Hierarchy and the Non-Confluence Property for Efficient LTL Synthesis
Andreas Morgenstern,Klaus Schneider
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.25.11
Abstract: The classic approaches to synthesize a reactive system from a linear temporal logic (LTL) specification first translate the given LTL formula to an equivalent omega-automaton and then compute a winning strategy for the corresponding omega-regular game. To this end, the obtained omega-automata have to be (pseudo)-determinized where typically a variant of Safra's determinization procedure is used. In this paper, we show that this determinization step can be significantly improved for tool implementations by replacing Safra's determinization by simpler determinization procedures. In particular, we exploit (1) the temporal logic hierarchy that corresponds to the well-known automata hierarchy consisting of safety, liveness, Buechi, and co-Buechi automata as well as their boolean closures, (2) the non-confluence property of omega-automata that result from certain translations of LTL formulas, and (3) symbolic implementations of determinization procedures for the Rabin-Scott and the Miyano-Hayashi breakpoint construction. In particular, we present convincing experimental results that demonstrate the practical applicability of our new synthesis procedure.
Triggering On Hadronic Tau Decays: A challenge met by ATLAS
Morgenstern Marcus M.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122812006
Abstract: The ATLAS experiment at the Large Hadron Collider (LHC) has been able to collect 5.25 fb 1 of data in 2011. For many physics analyses both in context of the Standard Model (SM) and Beyond the Standard Model (BSM) theories such as Higgs boson searches, tau leptons play an important role. Thus, triggering on hadronic tau decays is an essential ingredient for the success of those measurements. This contribution will summarize the developed efforts to meet this challenge. Efficiency measurements using data taken in 2011 at a center-of-mass energy of 7 TeV are described and results are presented. An outlook on further developments of the tau trigger algorithms, to match future requirements and higher instantaneous luminosities are summarised in the end.
Learning First, Technology Second: Enhancing Missionary Training Through Technology
Ernest Manges,Mark Morgenstern
Christian Perspectives in Education , 2010,
Abstract: This article describes how the missions agency EFCA ReachGlobal uses the open source online learning platform Moodle to train missionaries and to fulfill its goal to become a learning organization. Moodle is employed in three ways: online facilitated courses, collaboration zones and knowledge banks. Blended learning is also used, notably in ReachGlobal’s pre-field training for missionary candidates.
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