66 research outputs found
Die Entwicklung von Brennelementen schneller Brutreaktoren. EUR 3713. = The development of fast breeder reactors fuel elements. EUR 3713.
Cellular Uptake of Cationic Polymer-DNA Complexes Via Caveolae Plays a Pivotal Role in Gene Transfection in COS-7 Cells
Carbon Dioxide Emissions in a Methane Economy
Increasing reliance on natural gas (methane) to meet global energy demands holds implications for atmospheric CO2 concentrations. Analysis of these implications is presented, based on a logistic substitution model viewing energy technologies like biological species invading an econiche and substituting in case of superiority for existing species. This model suggests gas will become the dominant energy source and remain so for 50 years, peaking near 70 percent of world supply. Two scenarios of energy demand are explored, one holding per capita consumption at current levels, the second raising the global average in the year 2100 to the current U.S. level. In the first ("efficiency") scenario concentrations peak about 450 ppm, while in the second ("long wave") they near 600 ppm. Although projected CO2 concentrations in a "methane economy" are low in relation to other scenarios, the projections confirm that global climate warming is likely to be a major planetary concern throughout the twenty-first century. A second finding is that data on past growth of world per capita energy consumption group neatly into two pulses consistent with long-wave theories in economics
Central Collisions of Au on Au at 150, 250 and 400 A MeV
Collisions of Au on Au at incident energies of 150, 250 and 400 A MeV were
studied with the FOPI-facility at GSI Darmstadt. Nuclear charge (Z < 16) and
velocity of the products were detected with full azimuthal acceptance at
laboratory angles of 1-30 degrees. Isotope separated light charged particles
were measured with movable multiple telescopes in an angular range of 6-90
degrees. Central collisions representing about 1 % of the reaction cross
section were selected by requiring high total transverse energy, but vanishing
sideflow. The velocity space distributions and yields of the emitted fragments
are reported. The data are analysed in terms of a thermal model including
radial flow. A comparison with predictions of the Quantum Molecular Model is
presented.Comment: LateX text 62 pages, plus six Postscript files with a total of 34
figures, accepted by Nucl.Phys.
Unsere gescheiterte Mondfahrt — Die Rationalität der Brüterentwicklung unter den Zielen der 60erJahre
ENHANCED LOD CONCEPTS FOR VIRTUAL 3D CITY MODELS
Virtual 3D city models contain digital three dimensional representations of city objects like buildings, streets or technical
infrastructure. Because size and complexity of these models continuously grow, a Level of Detail (LoD) concept effectively
supporting the partitioning of a complete model into alternative models of different complexity and providing metadata, addressing
informational content, complexity and quality of each alternative model is indispensable. After a short overview on various LoD
concepts, this paper discusses the existing LoD concept of the CityGML standard for 3D city models and identifies a number of
deficits. Based on this analysis, an alternative concept is developed and illustrated with several examples. It differentiates between
first, a Geometric Level of Detail (GLoD) and a Semantic Level of Detail (SLoD), and second between the interior building and its
exterior shell. Finally, a possible implementation of the new concept is demonstrated by means of an UML model
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