Energy efficient engine low-pressure compressor component test hardware detailed design report

The aerodynamic and mechanical design description of the low pressure compressor component of the Energy Efficient Engine were used. The component was designed to meet the requirements of the Flight Propulsion System while maintaining a low cost approach in providing a low pressure compressor design for the Integrated Core/Low Spool test required in the Energy Efficient Engine Program. The resulting low pressure compressor component design meets or exceeds all design goals with the exception of surge margin. In addition, the expense of hardware fabrication for the Integrated Core/Low Spool test has been minimized through the use of existing minor part hardware

Energy efficient engine fan component detailed design report

The fan component which was designed for the energy efficient engine is an advanced high performance, single stage system and is based on technology advancements in aerodynamics and structure mechanics. Two fan components were designed, both meeting the integrated core/low spool engine efficiency goal of 84.5%. The primary configuration, envisioned for a future flight propulsion system, features a shroudless, hollow blade and offers a predicted efficiency of 87.3%. A more conventional blade was designed, as a back up, for the integrated core/low spool demonstrator engine. The alternate blade configuration has a predicted efficiency of 86.3% for the future flight propulsion system. Both fan configurations meet goals established for efficiency surge margin, structural integrity and durability

Protein self-association in solution: the bovine pancreatic trypsin inhibitor decamer.

We have used magnetic relaxation dispersion to study bovine pancreatic trypsin inhibitor (BPTI) self-association as a function of pH, salt type and concentration, and temperature. The magnetic relaxation dispersion method sensitively detects stable oligomers without being affected by other interactions. We find that BPTI decamers form cooperatively under a wide range of solution conditions with no sign of dimers or other small oligomers. Decamer formation is opposed by electrostatic repulsion among numerous cationic residues confined within a narrow channel. Accordingly, the decamer population increases with increasing pH, as cationic residues are deprotonated, and with increasing salt concentration. The salt effect cannot be described in terms of Debye screening, but involves the ion-specific sequestering of anions within the narrow channel. The lifetime of the BPTI decamer is 101 ± 4 min at 27°C. We propose that the BPTI decamer, with a heparin chain threading the decamer channel, plays a functional role in the mast cell. We also detect a higher oligomer that appears to be a subcritical nucleation cluster of 3–5 decamers. We argue that monomeric crystals form at high pH despite a high decamer population in solution, because the ion pairs that provide the critical decamer-decamer contacts are disrupted at high pH

The COMPLETE Survey of Outflows in Perseus

We present a study on the impact of molecular outflows in the Perseus molecular cloud complex using the COMPLETE survey large-scale 12CO(1-0) and 13CO(1-0) maps. We used three-dimensional isosurface models generated in RA-DEC-Velocity space to visualize the maps. This rendering of the molecular line data allowed for a rapid and efficient way to search for molecular outflows over a large (~ 16 sq. deg.) area. Our outflow-searching technique detected previously known molecular outflows as well as new candidate outflows. Most of these new outflow-related high-velocity features lie in regions that have been poorly studied before. These new outflow candidates more than double the amount of outflow mass, momentum, and kinetic energy in the Perseus cloud complex. Our results indicate that outflows have significant impact on the environment immediately surrounding localized regions of active star formation, but lack the energy needed to feed the observed turbulence in the entire Perseus complex. This implies that other energy sources, in addition to protostellar outflows, are responsible for turbulence on a global cloud scale in Perseus. We studied the impact of outflows in six regions with active star formation within Perseus of sizes in the range of 1 to 4 pc. We find that outflows have enough power to maintain the turbulence in these regions and enough momentum to disperse and unbind some mass from them. We found no correlation between outflow strength and star formation efficiency for the six different regions we studied, contrary to results of recent numerical simulations. The low fraction of gas that potentially could be ejected due to outflows suggests that additional mechanisms other than cloud dispersal by outflows are needed to explain low star formation efficiencies in clusters.Comment: Published in The Astrophysical Journa

Fast Re-Rendering of Volume and Surface Graphics by Depth, Color, and Opacity Buffering

A method for quickly re-rendering volume data consisting of several distinct materials and intermixed with moving geometry is presented. The technique works by storing depth, color and opacity information, to a given approximation, which facilitates accelerated rendering of fixed views at moderate storage overhead without re-scanning the entire volume. Storage information in the ray direction (what we have called super-z depth buffering), allows rapid transparency and color changes of materials, position changes of sub-objects, dealing explicitly with regions of overlap, and the intermixing or separately rendered geometry. The rendering quality can be traded-off against the relative storage cost and we present an empirical analysis of output error together with typical figures for its storage complexity. The method has been applied to the visualization of medical image data for surgical planning and guidance, and presented results include typical clinical data. We discuss the implications of our method for haptic (or tactile) rendering systems, such as for surgical simulation, and present preliminary results of rendering polygonal objects in the volume rendered scene.Engineering and Applied Science

The generalized holographic stereogram

Thesis (M.S.V.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1991.Includes bibliographical references (leaves 123-124).by Michael W. Halle.M.S.V.S

Multiple viewpoint rendering for three-dimensional displays

Thesis (Ph. D.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1997.Includes bibliographical references (leaves 159-164).Michael W. Halle.Ph.D

Variation of Legionella spp. with Lake Depth and Season in Two Norwegian Drinking Water Sources

In Norway, placement of the water treatment plant intake within the lake hypolimnion is considered a hygienic barrier against pathogens of fecal origin. It is unclear, however, whether this practice provides a barrier against opportunistic pathogens such as Legionella. In this study, water samples were collected at 10 m depth intervals near the drinking water intakes of two lakes. Legionella and one of their common hosts, Acanthamoeba spp., were quantified using culture-based assays (Legionella pneumophila only) and real-time quantitative PCR (qPCR). L. pneumophila and Acanthamoeba spp. were never detected by qPCR; Legionella spp., however, were present in all samples at concentrations ranging from 2.33 to 4.14 log10[copies/L] in lake A and from 2.69 to 4.27 log10[copies/L] in lake B. For most sampling months in both lakes, there was no significant difference between total bacteria and Legionella spp. concentrations at the intake depth versus those on the lake surface. The results of this limited investigation of two Norwegian water supplies suggest that placement of water treatment plant intakes within the hypolimnion may not afford a sufficient hygienic barrier against Legionella.publishedVersio

Landesfachkonzept "Zukunftschance Assistierte Ausbildung (ZaA)". Abschlussbericht der wissenschaftlichen Begleitung des Landesprogramms "Zukunftschance assistierte Ausbildung (ZaA)"

Der Abschlussbericht enthält eine zusammenfassende Betrachtung der wesentlichen Erkenntnisse der ersten (01.10.2016 - 31.10.2018), zweiten (01.06.2018 - 29.02.2020) und dritten (01.03.2020 - 31.07.2022) Phase der wissenschaftlichen Begleitung und eine Gesamteinschätzung und -bewertung des Landesprogramms "Zukunftschance assistierte Ausbildung (ZaA)". Mit dem Landesprogramm werden Jugendliche mit schwierigen Ausgangsbedingungen und hohem Förderbedarf durch entsprechende Vorbereitung und intensive sozialpädagogische Begleitung darin unterstützt, erfolgreich eine reguläre Ausbildung zu absolvieren. Die gesetzliche Grundlage bildet das im SGB III verankerte Instrument der „Assistierten Ausbildung". Das Landesprogramm ermöglicht gegenüber dem Regelinstrument u. a. die Einbeziehung weiterer Zielgruppen, einen erweiterten Personalschlüssel und zusätzliche Qualitätssicherungsmaßnahmen. Dies ermöglicht eine besonders engmaschige und individuelle Betreuung der Teilnehmenden. Mit Stand März 2022 haben 444 Jugendliche im Rahmen des Landesprogramms erfolgreich ihren Ausbildungsabschluss absolviert. Mit dem Auslaufen der ESF-Förderperiode 2014-2020 nähert sich auch das Ende des Förderprogramms „Zukunftschance assistierte Ausbildung (ZaA)“. Die Förderung bzw. Begleitung der aktiven Teilnehmenden im Programm in Hinblick auf den erfolgreichen Abschluss einer Ausbildung (und den erfolgreichen Übergang in eine anschließende Beschäftigung) läuft dabei bis zum Ende des individuellen Ausbildungsvertrages weiter. In neuer Form wird das Programm der assistierten Ausbildung bundesweit als flexible assistierte Ausbildung („Asa flex“) weitergeführt. (DIPF/Orig.