Instructions for the use of the FORTRAN 4 program COMPT

The programming manual for the program COMPT which computes the non-steady two dimensional flow field resulting from the interaction of two successive blade rows is presented. The manual is designed to provide guidance in running the program and a brief description of some of the numerical details. A brief review of the main features of the program is given

Unsteady flow through compressor stages

The application of the nonsteady Lax-Wendroff technique to problems with asymptotically periodic solution which offers a potentially powerful method for the investigation of the interaction of rotating and stationary blade rows in turbomachinery is reported. A technique for specifying boundary conditions with phase lag was developed to accomplish this. A complete nonlinear analysis is carried out numerically to determine the entire flow field without recourse to the assumption of small disturbances of linear equations which underlie the previous acoustic theories. The result, obtained for the case of equal number of rotor and stator blades shows that transonic flow can be handled without difficulty. In addition, the program is not limited with regard to blade thickness, camber or loading. Extension of this method to incorporate viscous wakes and to analysis of fully three dimensional configuration is feasible, and would greatly expand its utility in practical applications

Computation of unsteady transonic flows through rotating and stationary cascades. 1: Method of analysis

A numerical method of solution of the inviscid, compressible, two-dimensional unsteady flow on a blade-to-blade stream surface through a stage (rotor and stator) or a single blade row of an axial flow compressor or fan is described. A cyclic procedure has been developed for representation of adjacent blade-to-blade passages which asymptotically achieves the correct phase between all passages of a stage. A shock-capturing finite difference method is employed in the interior of the passage, and a method of characteristics technique is used at the boundaries. The blade slipstreams form two of the passage boundaries and are treated as moving contact surfaces capable of supporting jumps in entropy and tangential velocity. The Kutta condition is imposed by requiring the slipstreams to originate at the trailing edges, which are assumed to be sharp. Results are presented for several transonic fan rotors and compared with available experimental data, consisting of holographic observations of shock structure and pressure contour maps. A subcritical stator solution is also compared with results from a relaxation method. Finally, a periodic solution for a stage consisting of 44 rotor blades and 46 stator blades is discussed

Computation of unsteady transonic flows through rotating and stationary cascades. 2: User's guide to FORTRAN program B2DATL

Documentation for the FORTRAN program B2DATL is provided. The program input, output, and operational procedures are described; a dictionary of the principal FORTRAN variables is provided; the function of all subroutines; is outlined and flow charts of the principal subroutines and the main program are presented

Time-dependent transonic flow solutions for axial turbomachinery

Three-dimensional unsteady transonic flow through an axial turbomachine stage is described in terms of a pair of two-dimensional formulations pertaining to orthogonal surfaces, namely, a blade-to-blade surface and a hub-to-casing surface. The resulting systems of nonlinear, inviscid, compressible equations of motion are solved by an explicit finite-difference technique. The blade-to-blade program includes the periodic interaction between rotor and stator blade rows. Treatment of the boundary conditions and of the blade slipstream motion by a characteristic type procedure is discussed in detail. Harmonic analysis of the acoustic far field produced by the blade row interaction, including an arbitrary initial transient, is outlined. Results from the blade-to-blade program are compared with experimental measurements of the rotating pressure field at the tip of a high-speed fan. The hub-to-casing program determines circumferentially averaged flow properties on a meridional plane. Blade row interactions are neglected in this formulation, but the force distributions over the entire blade surface for both the rotor and stator are obtained. Results from the hub-to-casing program are compared with a relaxation method solution for a subsonic rotor. Results are also presented for a quiet fan stage which includes transonic flow in both the rotor and stator and a normal shock in the stator

Konzeption und Entwicklung einer Webservice Schnittstelle für ein Prozessmanagementsystem

Ziel von Unternehmen ist es die Effektivität und Effizienz ihrer Geschäftsprozesse zu steigern und somit Verwaltungskosten zu senken. Deshalb ist die Betrachtung dieser Geschäftsprozesse und deren Strukturierung, Analyse und Optimierung ein wichti- ges Ziel. Diese Optimierungen können mithilfe von Prozessmanagement durchgeführt und unterstützt werden. Prozessmanagementsysteme, die den Lebenszyklus von Ge- schäftsprozessen unterstützen und eine automatisierte Ausführung von Tätigkeiten ermöglichen, sind hierbei eine wichtige Technologie. Damit eine Integration dieser Syste- me und die Kommunikation zwischen vorhanden Informationssystemen und denselben implementiert werden kann, muss eine geeignete Schnittstelle vorhanden sein. In dieser Arbeit wird ein Konzept einer generischen Webservice Schnittstelle zur Kommu- nikation zwischen beteiligten Informationssystemen und Prozessmanagementsystemen erstellt. Dabei bietet die Webservice Schnittstelle eine standardisierte Vorgehensweise zur Kommunikation in Verbindung mit einer einheitlichen Repräsentation der zu über- mittelnden Daten an. Des Weiteren wird ein Mechanismus vorgestellt, mit dem die jeweiligen Informationssysteme ohne Schnittstellenveränderung ausgetauscht werden können. Zudem wurde eine prototypische Implementierung der Webservice Schnittstelle sowie ein Java Client für diese entwickelt

Entwicklung von Interaktionsszenarien für multimodale Informationssysteme

Durch die wachsende Investition in die Einführung von Industrie 4.0 und die Digitalisierung der Unternehmen, steigt die Vernetzung der verwendeten internettauglichen Geräte. Dadurch werden verschiedene Maschinen und Sensoren in das Netzwerk eingebunden und Daten können über das Internet abgerufen und angezeigt werden. Dabei steigt die Anzahl der verschiedenen Eingabe- und Ausgabegeräte, die in einem Unternehmen Verwendung finden. Zusätzlich schreitet die Technologie in den Bereichen Augmented Reality und Virtual Reality voran und der Verwendungszweck dieser Technologien breitet sich aus. Gleichzeit steigt mit Informationssystemen die Vernetzung der Eingabeund Ausgabegeräte untereinander und eine nahtlose Interaktion unter den Geräten wird immer wichtiger. Die Verwendung der multimodalen Eingabe durch verschiedene Eingabegeräte erhöht die Interaktionsmöglichkeiten in einem modernen, multimodalen Informationssystem. Deshalb ist die Verwendung von Interaktionsszenarien, zur Beschreibung der Interaktion der Eingabe- und Ausgabegeräte, ein wichtiger Bestandteil bei der Betrachtung von multimodalen Informationssystemen. Das Ziel dieser Arbeit ist die Entwicklung von Interaktionsszenarien, unter der Betrachtung verschiedener Eingabe- und Ausgabemodalitäten, anhand eines Anwendungsbeispieles zur Darstellung der Interaktionen in einem Unternehmen. Dabei werden Interaktionspatterns entwickelt, die anschließend in den Interaktionsszenarien Anwendung finden, welche die Zusammenarbeit der Eingabe- und Ausgabegeräte unter einem bestimmten Aspekt beschreiben

Fallout from U.S. atmospheric nuclear tests in New Mexico and Nevada (1945-1962)

One hundred and one atmospheric nuclear weapon tests were conducted between 1945 and 1962 in the United States, resulting in widespread dispersion of radioactive fallout, and leading to environmental contamination and population exposures. Accurate assessment of the extent of fallout from nuclear weapon tests has been challenging in the United States and elsewhere, due to limited monitoring and data accessibility. Here we address this deficit by combining U.S. government data, high-resolution reanalyzed historical weather fields, and atmospheric transport modeling to reconstruct radionuclide deposition across the contiguous United States, with 10-kilometer spatial and one-hour temporal resolution for five days following detonation, from all 94 atmospheric tests detonated in New Mexico and Nevada with fission yields sufficient to generate mushroom clouds. Our analysis also includes deposition estimates for 10 days following the detonation of Trinity, the first ever nuclear weapon test, on July 16, 1945. We identify locations where radionuclide deposition significantly exceeded levels in areas covered by the U.S. Radiation Exposure Compensation Act (RECA). These findings include deposition in all 48 contiguous U.S. states. They provide an opportunity for re-evaluating the public health and environmental implications from atmospheric nuclear testing. Finally, our findings also speak to debates about marking the beginning of the Anthropocene with nuclear weapons fallout. Our deposition estimates indicate that direct fallout from Trinity, a plutonium device, reached Crawford Lake in Canada, the proposed "golden spike" site marking the beginning of the Anthropocene epoch, starting on July 20, 1945.Comment: 19 pages, 4 figures, 1 supplementary table, 3 supplementary figure

Orbit Determination of Close Binary Systems using Lucky Imaging

We present relative positions of visual binaries observed during 2009 with the FastCam "lucky-imaging" camera at the 1.5-m Carlos Sanchez Telescope (TCS) at the Observatorio del Teide. We obtained 424 CCD observations (averaged in 198 mean relative positions) of 157 binaries with angular separations in the range 0.14-15.40", with a median separation of 0.51". For a given system, each CCD image represents the sum of the best 10-25% images from 1000-5000 short-exposure frames. Derived internal errors were 7 mas in r and 1.2^{\circ} (9 mas) in q. When comparing to systems with very well-known orbits, we find that the rms deviation in r residuals is 23 mas, while the rms deviation in q residuals is 0.73 deg/r. We confirmed 18 Hipparcos binaries and we report new companions to BVD 36 A and J 621 B. For binaries with preliminary orbital parameters, the relative radial velocity was estimated as well. We also present four new revised orbits computed for LDS 873, BU 627 A-BC, BU 628 and HO 197 AB. This work is the first results on visual binaries using the FastCam lucky-imaging camera.Comment: 23 pages, 10 figures, 14 tables, accepted August 18th, 2011, to be published in MNRA