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EU-Projekt INSYSME : innovative Systeme für erdbebentaugliche Ausfachungswände aus Ziegelmauerwerk
(2014)
Kyphoplasty of Osteoporotic Fractured Vertebrae: A Finite Element Analysis about Two Types of Cement
(2019)
Transport through Redox-Active Ru-Terpyridine Complexes Integrated in Single Nanoparticle Devices
(2020)
Transition metal complexes are electrofunctional molecules due to their high conductivity and their intrinsic switching ability involving a metal-to-ligand charge transfer. Here, a method is presented to contact reliably a few to single redox-active Ru-terpyridine complexes in a CMOS compatible nanodevice and preserve their electrical functionality. Using hybrid materials from 14 nm gold nanoparticles (AuNP) and bis-{4′-[4-(mercaptophenyl)-2,2′:6′,2″-terpyridine]}-ruthenium(II) complexes a device size of 30² nm² inclusive nanoelectrodes is achieved. Moreover, this method bears the opportunity for further downscaling. The Ru-complex AuNP devices show symmetric and asymmetric current versus voltage curves with a hysteretic characteristic in two well separated conductance ranges. By theoretical approximations based on the single-channel Landauer model, the charge transport through the formed double-barrier tunnel junction is thoroughly analyzed and its sensibility to the molecule/metal contact is revealed. It can be verified that tunneling transport through the HOMO is the main transport mechanism while decoherent hopping transport is present to a minor extent.
Energiequelle für morgen : Möglichkeiten und Grenzen der Windenergienutzung - ein Statusbericht
(1977)
Erneuerbare Energien sollen in die Bresche springen. Geld, Kraft und politisches Wollen ist gefragt
(1995)
Non-nuclear and non-fossil energy resources and their possibilities for future power generation
(1975)
It must be stressed that the assessment of the exploitation possibilities of the energy resources discussed in this paper requires further studies. With this proviso, the situation can be provisionally summarised as follows: The total potential of known geothermal steam sources is only 64 GW. Geothermal energy could therefore only make a significant contribution to covering the worldwide power needs if we succeed in exploiting dry geothermal reservoirs. Exploitation of tidal energy is limited to a few geographically favourable locations. The power generation potential at these locations is only about 64 GW. An important drawback of tidal power is discontinuous power generation. Large scale exploitation of wind, wave and glacier energy, and of ocean heat, requires solution of a number of technological problems. The environmental effects of exploitation of these energy resources are to some extent of a qualitatively different nature from those of operation of fossil-fuel-fired and of nuclear power plants. The scanty knowledge in this area often results in these effects being underestimated. In any case, however, it would be deliberately misleading to postulate that any form of power generation is possible without some detrimental effects on the environment. It may be stated in conclusion that, owing to their small potential or to the as yet insufficiently advanced technological development, none of the energy resources discussed in this paper can make a significant contribution to the solution of middle-term energy supply problems, i.e., to a rapid replacement of mineral oil and natural gas.
Regenerative Energiequellen
(1997)
Regenerative Energiequellen
(1998)
Regenerative Energiequellen
(1994)
Regenerative Energiequellen
(1993)
Regenerative Energiequellen
(1992)
Regenerative Energiequellen
(1996)
Regenerative Energiequellen
(1980)
Regenerative Energiequellen
(1977)
Regenerative Energiequellen
(1990)
Regenerative Energiequellen
(1995)
Globale Betrachtung regenerativer Energieressourcen und deren technischer Nutzungsmöglichkeiten
(1995)
Regenerative Energiequellen
(1991)
Regenerative Energiequellen
(1989)
Regenerative Energiequellen
(1988)
Regenerative Energiequellen
(1986)
Regenerative Energiequellen
(1987)
Regenerative Energiequellen
(1985)
Regenerative Energiequellen
(1984)
Regenerative Energiequellen
(1983)
Regenerative Energiequellen
(1982)
Regenerative Energiequellen
(1981)
Regenerative Energiequellen
(1979)
Regenerative Energiequellen
(1978)
Using results from an 8 m2 instrumented force plate we describe field measurements of normal and shear stresses, and fluid pore pressure for a debris flow. The flow depth increased from 0.1 to 1 m within the first 12 s of flow front arrival, remained relatively constant until 100 s, and then gradually decreased to 0.5 m by 600 s. Normal and shear stresses and pore fluid pressure varied in-phase with the flow depth. Calculated bulk densities are ρb = 2000–2250 kg m−3 for the bulk flow and ρf = 1600–1750 kg m−3 for the fluid phase. The ratio of effective normal stress to shear stress yields a Coulomb basal friction angle of ϕ = 26° at the flow front. We did not find a strong correlation between the degree of agitation in the flow, estimated using the signal from a geophone on the force plate, and an assumed dynamic pore fluid pressure. Our data support the idea that excess pore-fluid pressures are long lived in debris flows and therefore contribute to their unusual mobility.
Germanistik [Lexikoneintrag]
(1998)
Wie national ist die Germanistik? Die Scheu der Literaturwissenschaft vor der eigenen Vergangenheit
(1993)
Frauen und Revolution: Der weibliche Anteil an der Geschichte. Christa Wolf und das Ende der DDR
(1991)
Das Ich ist eine Illusion
(1990)