162 research outputs found
Stadtarchiv Dorsten: FaMI – Fachrichtung Archiv
No full textDas Stadtarchiv Dorsten sucht zum nächstmöglichen Zeitpunkt eine:n Fachangestellte:n für Medien- und Informationsdienste (m/w/d) – Fachrichtung Archiv. Es handelt sich um eine unbefristete Teilzeitstelle. Bewerbungsschluss: 05.05.2024 Hier geht es zur Stellenanzeige
Een eigentijds woonconcept binnen de bestaande structuur van de ‘van der Kunbuurt’ in Amsterdam
No full textEen eigentijds woonconcept binnen de bestaande structuur van de ‘van der Kunbuurt’ in Amsterdam.DwellingArchitectureArchitecture and The Built Environmen
Jahresbericht des Katholischen Progymnasiums zu Dorsten / Beiträge zur Geschichte des Progymnasiums zu Dorsten
No full textM. J. KorkBeitr. teilw. dt., teilw. lat. - Teilw. in FrakturErschienen: 1.1867 - 2.186
Erstes Statusseminar 'Druckflamm'. Entwicklung eines kohlegefeuerten Gas-und Dampfturbinenprozesses mit Fluessigascheabscheidung Tagungsband
No full textSix industrial enterprises in the Ruhr, plus several universities and national rsearch centers are working on the 'Druckflamm' process of pressurized coal dust combustion, which is described in this status report and is scheduled to be implementable within the next 20 years. To this end, an experimental facility (DKSF) was constructed at Dorsten. The plant works by a coal-fuelled combined cycle process in which the flue gas can be led directly onto a gas turbine after purification. This means that the flue gas must be free of particulate materials and noxious vapours, i.e. a particle size of less than 3 mg/m"3, a particle diameter of less than 3 #mu#m and an alkali concentration of less than 1 ppm. The Dorsten plant is fuelled with coal; it has a thermal capacity of 1 MW and can be operated at pressures up to 20 bar. The contribution presents an outline drawing of the plant and a survey of the results and information obtained so far. Material problems and methods of measurement are reported separately. The fuel coals were of different composition, with slag flow points between 1200 and 1400 degrees centigradeIm Ruhrgebiet wird an einem neuen Verfahren zur Verstromung von Steinkohle gearbeitet. Es soll in etwa 20 Jahren mit einem neuen Kraftwerkstyp einsetzbar sein. Kennzeichen dieses Verfahrens sind ein hoher Wirkungsgrad von mehr als 50% und eine geringe CO_2-Emission. Entwickelt wird das ''Druckkohlenstaubfeuerung'' genannte Projekt von sechs Industrieunternehmen. Zusaetzlich arbeiten an diesem Thema weitere Unternehmen sowie Universitaeten und Grossforschungseinrichtungen unter dem Arbeitstitel ''Druckflamm''. Bisherige Ergebnisse der grundlegenden Entwicklungsarbeiten sind in diesem Statusbericht zusammengefasst. Ziel des Verbundprojektes Druckkohlenstaubfeuerung (DKSF) in Dorsten ist, einen GUD-Prozess auf Kohlebasis zu entwickeln, der dadurch charakterisiert ist, dass das Rauchgas nach Reinigung unmittelbar auf eine Gasturbine geleitet werden kann. Dabei muss das Rauchgas soweit von Partikeln und materialschaedlichen Daempfen gereinigt werden, dass es gasturbinenvertraeglich wird. Nach Angaben der Turbinenhersteller bedeutet dies einen Partikelgehalt <3mg/m"3 i.N. bei einem Partikeldurchmesser < 3 #mu#m und einem Alkaligehalt < 1 ppm. Zur praktischen Erprobung dieser Entwicklung wird in Dorsten auf dem Gelaende eines frueheren STEAG-Kraftwerkes eine Versuchsanlage gefahren. Mit ihr wollen die Betreiber den Gas-Dampfturbinenprozess, der mit Heizoel oder Gas Wirkungsgrade von z.Z. 57 % erreicht, auch fuer Kohle nutzbar machen. Die in Dorsten errichtete Versuchsanlage besitzt eine thermische Leistung von 1 MW und kann bis zu einem Druck von 20 bar betrieben werden. Ein Ueberblick ueber die bisher erzielten Ergebnisse und gewonnenen Erkenntnisse zu Einsatzkohle, Verbrennung und Rauchgasreinigung wird der schematischen Darstellung der Anlage folgend gegeben. Ueber Materialverhalten und Messtechnik wird gesondert berichtet. Als Brennstoff wurden Kohlen unterschiedlicher Zusammensetzung mit Schlackefliesspunkten zwischen ca. 1200 bis 1400 C eingesetzt. (orig.AKF)Available from TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Wirtschaft, Bonn (Germany)DEGerman
Topics in Heavy Particle Effective Theories
No full textThis thesis gives several applications of effective field theory to processes involving heavy particles. The first is a standard application of heavy quark effective theory to exclusive B decays. It involves two sum rules giving constraints on the curvature of the B→D Isgur-Wise function. This thesis calculates order alpha corrections to these constraints, increasing the accuracy of the resultant constraints on the physical form factors.
The second application involves matching SCETI onto SCETII at one loop. Keeping the external fermions off their mass shell does not regulate all IR divergences in both theories. The work described here gives a new prescription to regulate infrared divergences in SCET. Using this regulator, we show that soft and collinear modes in SCETII are sufficient to reproduce all the infrared divergences of SCETI. We explain the relationship between IR regulators and an additional mode proposed for SCETII.
Next we consider top production at large energies. The production process is characterized by three disparate energy scales: the center-of-mass energy (E), the mass (m), and the decay width (Gamma). At the scale E we match onto massive soft-collinear effective theory (SCET). The SCET current is run from E to m, thereby summing Sudakov logarithms of the form logn(m/E), where n=2,1. At the scale m, the top quark mass is integrated out by matching SCET jet functions onto a boosted version of heavy quark effective theory (bHQET). The jet functions in bHQET are then run from m to Gamma, summing powers of single logarithms of the ratio m/Gamma.
Under certain assumptions factorization formulas can be derived for differential distributions in processes involving highly energetic jets, such as jet energy distributions. As a final topic, we show how to test these assumptions using semileptonic or radiative decays of heavy mesons, by relating the jet P⁺ distribution derived under these assumptions to other differential distributions in these decays, which are better understood.</p
Spectroscopic characterization of the near-surface electronic structure of surface-modified III-V semiconductors
No full textInvestigations of the near-surface electronic structure of n\sp+-GaAs and n\sp+-InAs are presented. Recent studies of the GaAs surface have been carried out which demonstrate that the surface states which arise from termination of the crystal lattice, which are known to cause pinning of the Fermi energy level and an increase in the Schottky barrier in the semiconductor, can be passivated using inorganic sulfides. Although treatment with the inorganic sulfides is effective in reducing the surface recombination velocity, the loss of the surface As atoms during the treatment causes an electronic reorganization in the semiconductor which actually pins the Fermi level closer to the valence band and subsequently increases the band-bending at the surface. In this research, passivation with a long-chain alkane thiol demonstrates the ability to passivate the surface while unpinning the Fermi level and reducing the surface band-bending. This change is measured quantitatively by applying Raman spectroscopy is a probe of the near-surface region. The distinct electronic regions of the semiconductor surface can be differentiated by monitoring the predominant crystal vibrations from each region which give rise to Raman scattering.In a second system, Raman spectroscopy is again used to probe the surface electronic characteristics of a semiconductor. A semiconductor/superconductor interface is investigated to explore Cooper pair transport across the interface while the system is in a superconducting state. Previous investigations of a Nb/InGaAs system show an anomalous current at zero bias which arises when the system is superconducting. However, this phenomenon is not explained by current superconducting models. Typical contact probes which are often used to investigate small superconducting currents are difficult to employ in this system, so the Raman optical probe was used to carry out the research. An InAs/Nb structure was fabricated such that an Ohmic contact was made to provide a barrier-free interface for electron flow. The temperature of the system was lowered below the superconducting transition temperature and the resulting optical measurements were compared to those of the system taken in a normal state. These initial investigations show a change in the electronic character of the InAs supporting a case for Cooper pair transport in the system.Made available in DSpace on 2011-05-07T12:35:15Z (GMT). No. of bitstreams: 2
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<sup>31</sup>P NMR studies of creatine kinase flux in M-creatine kinase-deficient mouse heart
No full textHearts of wild-type and cytosolic muscle creatine kinase (M-CK)-knockout mice were perfused with Krebs-Henseleit buffer containing 10 mM glucose and 5 mM pyruvate and studied during pacing at 400 and 600 beats/min and during K+arrest. Phosphocreatine (PCr) and ATP concentrations in M-CK-deficient hearts were not significantly different from those in wild-type hearts. With the use of31P NMR saturation transfer, the flux mediated predominantly by mitochondrial creatine kinase (Mi-CK) was clearly detected in M-CK-deficient hearts. Mi-CK flux was 4.8 ± 0.6 and 4.5 ± 0.6 mM/s during pacing at 400 and 600 beats/min, respectively, and was 3.5 ± 0.4 mM/s during cardiac arrest. In control hearts total CK flux was 7.8 ± 1.1 and 6.6 ± 1.3 mM/s during pacing at 400 and 600 beats/min, respectively, and decreased to 3.8 ± 0.5 mM/s during arrest. It is suggested that the relative contribution of Mi-CK to the total NMR-measured CK flux in the wild-type heart is higher than that of the homodimeric M-CK isoform (MM-CK).</jats:p
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