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Search Results: 1 - 10 of 124255 matches for " T. Sch?ne "
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Least Squares Problems with Absolute Quadratic Constraints
R. Sch ne,T. Hanning
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/312985
Abstract: This paper analyzes linear least squares problems with absolute quadratic constraints. We develop a generalized theory following Bookstein's conic-fitting and Fitzgibbon's direct ellipse-specific fitting. Under simple preconditions, it can be shown that a minimum always exists and can be determined by a generalized eigenvalue problem. This problem is numerically reduced to an eigenvalue problem by multiplications of Givens' rotations. Finally, four applications of this approach are presented.
GPS water level measurements for Indonesia's Tsunami Early Warning System
T. Schne,W. Pandoe,I. Mudita,S. Roemer
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2011, DOI: 10.5194/nhess-11-741-2011
Abstract: On Boxing Day 2004, a severe tsunami was generated by a strong earthquake in Northern Sumatra causing a large number of casualties. At this time, neither an offshore buoy network was in place to measure tsunami waves, nor a system to disseminate tsunami warnings to local governmental entities. Since then, buoys have been developed by Indonesia and Germany, complemented by NOAA's Deep-ocean Assessment and Reporting of Tsunamis (DART) buoys, and have been moored offshore Sumatra and Java. The suite of sensors for offshore tsunami detection in Indonesia has been advanced by adding GPS technology for water level measurements. The usage of GPS buoys in tsunami warning systems is a relatively new approach. The concept of the German Indonesian Tsunami Early Warning System (GITEWS) (Rudloff et al., 2009) combines GPS technology and ocean bottom pressure (OBP) measurements. Especially for near-field installations where the seismic noise may deteriorate the OBP data, GPS-derived sea level heights provide additional information. The GPS buoy technology is precise enough to detect medium to large tsunamis of amplitudes larger than 10 cm. The analysis presented here suggests that for about 68% of the time, tsunamis larger than 5 cm may be detectable.
GPS-controlled tide gauges in Indonesia – a German contribution to Indonesia's Tsunami Early Warning System
T. Schne,J. Illigner,P. Manurung,C. Subarya
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2011, DOI: 10.5194/nhess-11-731-2011
Abstract: Coastal tide gauges do not only play a central role in the study of climate-related sea level changes but also in tsunami warning systems. Over the past five years, ten GPS-controlled tide gauge systems have been installed by the German Research Centre for Geosciences (GFZ) in Indonesia to assist the development of the Indonesian Tsunami Early Warning System (InaTEWS). These stations are mainly installed at the Indonesian coastline facing the Indian Ocean. The tide gauge systems deliver information about the instantaneous sea level, vertical control information through GPS, and meteorological observations. A tidal analysis at the station's computer allows the detection of rapid changes in the local sea level ("sea level events"/SLE), thus indicating, for example, the arrival time of tsunamis. The technical implementation, communication issues, the operation and the sea level event detection algorithm, and some results from recent earthquakes and tsunamis are described in this paper.
A new permanent multi-parameter monitoring network in Central Asian high mountains – from measurements to data bases
T. Schne,C. Zech,K. Unger-Shayesteh,V. Rudenko
Geoscientific Instrumentation, Methods and Data Systems Discussions , 2012, DOI: 10.5194/gid-2-301-2012
Abstract: Long-term monitoring of water resources and climate parameters at the scale of river basins requires networks of continuously operated in-situ stations. Since 2009, GFZ and CAIAG, in cooperation with the National Hydrometeorological Services (NHMS), are establishing such a regional monitoring network in Central Asia (Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, and Afghanistan) which is collecting observations of meteorological and hydrological parameters and delivering them to the end-users. The network design focuses mainly on the higher elevations where the recent decline of monitoring stations and networks established in Soviet times was strongest, and the resulting observational gap hinders research on climate and hydrological change as well as operational tasks in water management such as the seasonal runoff forecast. The newly developed and installed Remotely Operated Multi-Parameter Stations (ROMPS) do not only monitor standard meteorological and hydrological parameters, but also deliver GPS data for atmospheric sounding as well as tectonic studies. The observational data from the ROMPS is transmitted at least once a day to a centralized geo-database infrastructure for long-term storage and data redistribution. Users can access the data manually using a web-interface or automatically using SOS requests; in addition, data is distributed to the NHMS through standard communication and data exchange channels.
Die teilnehmende Beobachtung als Datenerhebungsmethode in der Politikwissenschaft. Methodologische Reflexion und Werkstattbericht Participant Observation in Political Science: Methodological Reflection and Field Report La observación participante en ciencia política: reflexión metodológica y reporte de campo
Helmar Schne
Forum : Qualitative Social Research , 2003,
Abstract: In empirischen politikwissenschaftlichen Studien wird die teilnehmende Beobachtung nicht nur selten angewendet, bislang wurde sie innerhalb der deutschen Politikwissenschaft auch nur unzureichend theoretisch und methodisch reflektiert. Nach einer wissenschaftstheoretischen Einführung zeigt der Artikel aufbauend auf die praktisch-methodischen Erfahrungen aus zwei Forschungsprojekten zur Parlamentarismusforschung, wie sich die teilnehmende Beobachtung in der politikwissenschaftlichen Forschung einsetzen l sst. Der Beitrag diskutiert die mit der teilnehmenden Beobachtung verbundenen Erkenntnischancen und zeigt L sungen für jene Probleme auf, die u.a. bei der Erstellung der Datenerhebungsinstrumente, bei der Datenerhebung und bei der Datenauswertung auftreten k nnen. URN: urn:nbn:de:0114-fqs0302202 The usage of participant observation in empirical studies in political science has been rare and moreover the reflection of the underlying theories and methods has been very unsatisfactory. After a theoretical introduction this article shows a way of applying participant observation efficiently to political science research, based on the practical and methodical experience from two research projects on parliamentarism. The article discusses the chances of cognition provided by participant observation and suggests solutions to problems that emerge during the preparation of survey instruments, during the field work and during the data analysis. URN: urn:nbn:de:0114-fqs0302202 El uso de la observación participante en los estudios empíricos en ciencia política ha sido raro, además que la reflexión en torno a las teorías y métodos subyacentes ha sido demasiado insatisfactoria. A partir de una experiencia práctica y metódica desde dos proyectos de investigación sobre parlamentarismo, luego de hacer una introducción teórica, este artículo muestra una vía para aplicar eficientemente la observación participante a la investigación en ciencia política. El artículo discute la oportunidad de cognición proporcionada por la observación participante y sugiere soluciones a los problemas que surgen durante la preparación de los instrumentos de investigación, durante el trabajo de campo y durante el análisis de los datos. URN: urn:nbn:de:0114-fqs0302202
Glutamate and GABA as rapid effectors of hypothalamic “peptidergic” neurons
Cornelia Schne,Denis Burdakov
Frontiers in Behavioral Neuroscience , 2012, DOI: 10.3389/fnbeh.2012.00081
Abstract: Vital hypothalamic neurons regulating hunger, wakefulness, reward-seeking, and body weight are often defined by unique expression of hypothalamus-specific neuropeptides. Gene-ablation studies show that some of these peptides, notably orexin/hypocretin (hcrt/orx), are themselves critical for stable states of consciousness and metabolic health. However, neuron-ablation studies often reveal more severe phenotypes, suggesting key roles for co-expressed transmitters. Indeed, most hypothalamic neurons, including hcrt/orx cells, contain fast transmitters glutamate and GABA, as well as several neuropeptides. What are the roles and relations between different transmitters expressed by the same neuron? Here, we consider signaling codes for releasing different transmitters in relation to transmitter and receptor diversity in behaviorally defined, widely projecting “peptidergic” neurons, such as hcrt/orx cells. We then discuss latest optogenetic studies of endogenous transmitter release from defined sets of axons in situ, which suggest that recently characterized vital peptidergic neurons [e.g., hcrt/orx, proopiomelanocortin (POMC), and agouti-related peptide (AgRP) cells], as well as classical modulatory neurons (e.g., dopamine and acetylcholine cells), all use fast transmitters to control their postsynaptic targets. These optogenetic insights are complemented by recent observations of behavioral deficiencies caused by genetic ablation of fast transmission from specific neuropeptidergic and aminergic neurons. Powerful and fast (millisecond-scale) GABAergic and glutamatergic signaling from neurons previously considered to be primarily “modulatory” raises new questions about the roles of slower co-transmitters they co-express.
A new permanent multi-parameter monitoring network in Central Asian high mountains – from measurements to data bases
T. Sch ne, C. Zech, K. Unger-Shayesteh, V. Rudenko, H. Thoss, H.-U. Wetzel, A. Gafurov, J. Illigner,A. Zubovich
Geoscientific Instrumentation, Methods and Data Systems (GI) & Discussions (GID) , 2013, DOI: 10.5194/gi-2-97-2013
Abstract: Long-term monitoring of water resources and climate parameters at the scale of river basins requires networks of continuously operated in-situ stations. Since 2009, GFZ and CAIAG, in cooperation with the National Hydrometeorological Services (NHMS) of Central Asia, are establishing such a regional monitoring network in Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, and lately Afghanistan to collect observations of meteorological and hydrological parameters and to deliver them to the end-users for operational tasks and scientific studies. The newly developed and installed remotely operated multi-parameter stations (ROMPS) do not only monitor standard meteorological and hydrological parameters, but also deliver Global Navigation Satellite System (GNSS) data for atmospheric sounding as well as tectonic studies. Additionally, three stations integrate seismic sensors for earthquake monitoring. The observational data from the ROMPS is transmitted nominally in near-real time, but at least once a day to a centralized geo-database infrastructure for long-term storage and data redistribution. Users can access the data manually using a web-interface or automatically using SOS requests; in addition, data is planed to be distributed to the NHMS through standard communication and data exchange channels.
Osprey – war for its own existence
Tomá? SCHóBER,Matú? GREGA,Pavel NE?AS
INCAS Bulletin , 2012, DOI: 10.13111/2066-8201.2012.4.3.8
Abstract: The aircraft that flies like an airplane but takes off and lands like a chopper. It has been a long, strange trip: the V-22 has been 25 years in development, more than twice as long as the Apollo program that put men on the moon. V-22 crashes have claimed the lives of 30 men — 10 times the lunar program's toll — all before the plane has seen combat. The Pentagon has put $20 billion into the Osprey and expects to spend an additional $35 billion before the program is finished. In exchange, the Marines, Navy and Air Force will get 458 aircraft, averaging $119 million per copy.
New light fighters from Asia on the global markets
Tomá? SCHóBER,Pavel NE?AS,Pavel PULI?
INCAS Bulletin , 2013, DOI: 10.13111/2066-8201.2013.5.1.14
Abstract: The high cost of the latest fighters is having a major impact on world air forces, big or small. For many countries it is a difficult balancing act as it becomes hard to afford enough aircraft to maintain the required force structure. Those air forces have to ask themselves whether they can afford enough fighters to accomplish all the desired missions. Many European Air Forces are in unenviable situation, because they can perform only the basic tasks like training and QRA missions over its own territory with limited possibilities for overseas deployment. This paper evaluates the likelihood of renaissance of the light fighter concept and describes three new Asian supersonics with their advantages and disadvantages. The aim is not to select the best lightweight fighter, but to show that rearming to the light variants of combat aircraft should be a good way for some Air Forces.
Time-dependent screening of a positive charge distribution in metals: Excitons on an ultra-short time scale
Wolf-Dieter Sch{?}ne,Walter Ekardt
Physics , 2000,
Abstract: Experiments determining the lifetime of excited electrons in crystalline copper reveal states which cannot be interpreted as Bloch states [S. Ogawa {\it et al.}, Phys. Rev. B {\bf 55}, 10869 (1997)]. In this article we propose a model which explains these states as transient excitonic states in metals. The physical background of transient excitons is the finite time a system needs to react to an external perturbation, in other words, the time which is needed to build up a polarization cloud. This process can be probed with modern ultra-short laser pulses. We calculate the time-dependent density-response function within the jellium model and for real Cu. From this knowledge it is possible within linear response theory to calculate the time needed to screen a positive charge distribution and -- on top of this -- to determine excitonic binding energies. Our results lead to the interpretation of the experimentally detected states as transient excitonic states.
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