@misc{KleineCalbetiElias, author = {Kleine, Aya and Calbet i Elias, Laura}, title = {Gemeinwohlorientierte Bodennutzung in Kooperation. Ein Handlungsleitfaden f{\"u}r {\"o}ffentlich-zivielgesellschaftliche Partnerschaften}, editor = {Calbet i Elias, Laura and Vollmer, Lisa and Kleine, Aya}, edition = {Erste Auflage}, doi = {10.25643/bauhaus-universitaet.6398}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20230609-63988}, pages = {56}, abstract = {Dieser Handlungsleitfaden m{\"o}chte die gemeinwohlorientierte Vergabe von R{\"a}umen und Fl{\"a}chen an zivilgesellschaftliche Gruppen st{\"a}rken. Er ist als Inspirationssammlung zu verstehen, die den Weg zu neuen Kooperationen zwischen {\"o}ffentlichen und zivilgesellschaftlichen Akteuren erleichtern soll. Wissenswertesund inspirierende Beispiele bieten eine Starthilfe, um nicht nur einzelne stadtr{\"a}umliche Experimente zu wagen, sondern die gemeinwohlorientierte Fl{\"a}chen- und Raumvergabe an zivilgesellschaftliche Gruppen kommunal zu verankern. Denn {\"o}ffentliche Liegenschaften sind nach vielen Jahren der Privatisierung eine rare Ressource, die umso mehr dem Gemeinwohl dienen sollte.}, subject = {Liegenschaftspolitik}, language = {de} } @article{LorekWagner, author = {Lorek, Andreas and Wagner, Norman}, title = {Supercooled interfacial water in fine grained soils probed by dielectric spectroscopy}, series = {Cryosphere}, journal = {Cryosphere}, doi = {10.5194/tc-7-1839-2013}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170516-31840}, pages = {1839 -- 1855}, abstract = {Water substantially affects nearly all physical, chemical and biological processes on the Earth. Recent Mars observations as well as laboratory investigations suggest that water is a key factor of current physical and chemical processes on the Martian surface, e.g. rheological phenomena. Therefore it is of particular interest to get information about the liquid-like state of water on Martian analogue soils for temperatures below 0 °C. To this end, a parallel plate capacitor has been developed to obtain isothermal dielectric spectra of fine-grained soils in the frequency range from 10 Hz to 1.1 MHz at Martian-like temperatures down to -70 °C. Two Martian analogue soils have been investigated: a Ca-bentonite (specific surface of 237 m2 g-1, up to 9.4\% w / w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146 m2 g-1, up to 7.4\% w / w). Three soil-specific relaxation processes are observed in the investigated frequency-temperature range: two weak high-frequency processes (bound or hydrated water as well as ice) and a strong low-frequency process due to counter-ion relaxation and the Maxwell-Wagner effect. To characterize the dielectric relaxation behaviour, a generalized fractional dielectric relaxation model was applied assuming three active relaxation processes with relaxation time of the ith process modelled with an Eyring equation. The real part of effective complex soil permittivity at 350 kHz was used to determine ice and liquid-like water content by means of the Birchak or CRIM equation. There are evidence that bentonite down to -70 °C has a liquid-like water content of 1.17 monolayers and JSC Mars 1 a liquid-like water content of 1.96 monolayers.}, subject = {Grundwasser}, language = {en} } @article{SchanzTripathy, author = {Schanz, Tom and Tripathy, Snehasis}, title = {Swelling pressure of a divalent-rich bentonite: Diffuse double-layer theory revisited}, series = {Water Resources Research}, journal = {Water Resources Research}, doi = {10.1029/2007WR006495}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170425-31592}, abstract = {Physicochemical forces are responsible for the swelling pressure development in saturated bentonites. In this paper, the swelling pressures of several compacted bentonite specimens for a range of dry density of 1.10-1.73 Mg/m3 were measured experimentally. The clay used was a divalent-rich Ca-Mg-bentonite with 12\% exchangeable Na+ ions. The theoretical swelling pressure-dry density relationship for the bentonite was determined from the Gouy-Chapman diffuse double-layer theory. A comparison of experimental and theoretical results showed that the experimental swelling pressures are either smaller or greater than their theoretical counterparts within different dry density ranges. It is shown that for dry density of the clay less than about 1.55 Mg/m3, a possible dissociation of ions from the surface of the clay platelets contributed to the diffuse double-layer repulsion. At higher dry densities, the adsorptive forces due to surface and ion hydration dominated the swelling pressures of the clay. A comparison of the modified diffuse double-layer theory equations proposed in the literature to determine the swelling pressures of compacted bentonites and the experimental results for the clay in this study showed that the agreement between the calculated and experimental swelling pressure results is very good for dry densities less than 1.55 Mg/m3, whereas at higher dry densities the use of the equations was found to be limited.}, subject = {Bentonit}, language = {en} } @article{LorekWagner, author = {Lorek, Andreas and Wagner, Norbert}, title = {Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy}, series = {Cryosphere}, journal = {Cryosphere}, doi = {10.25643/bauhaus-universitaet.3149}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170425-31490}, pages = {1839 -- 1855}, abstract = {Water substantially affects nearly all physical, chemical and biological processes on the Earth. Recent Mars observations as well as laboratory investigations suggest that water is a key factor of current physical and chemical processes on the Martian surface, e.g. rheological phenomena. Therefore it is of particular interest to get information about the liquid-like state of water on Martian analogue soils for temperatures below 0 °C. To this end, a parallel plate capacitor has been developed to obtain isothermal dielectric spectra of fine-grained soils in the frequency range from 10 Hz to 1.1 MHz at Martian-like temperatures down to -70 °C. Two Martian analogue soils have been investigated: a Ca-bentonite (specific surface of 237 m2 g-1, up to 9.4\% w / w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146 m2 g-1, up to 7.4\% w / w). Three soil-specific relaxation processes are observed in the investigated frequency-temperature range: two weak high-frequency processes (bound or hydrated water as well as ice) and a strong low-frequency process due to counter-ion relaxation and the Maxwell-Wagner effect. To characterize the dielectric relaxation behaviour, a generalized fractional dielectric relaxation model was applied assuming three active relaxation processes with relaxation time of the ith process modelled with an Eyring equation. The real part of effective complex soil permittivity at 350 kHz was used to determine ice and liquid-like water content by means of the Birchak or CRIM equation. There are evidence that bentonite down to -70 °C has a liquid-like water content of 1.17 monolayers and JSC Mars 1 a liquid-like water content of 1.96 monolayers.}, subject = {Wasser}, language = {en} } @phdthesis{Baumbusch1998, author = {Baumbusch, J{\"u}rgen}, title = {Zur Kontaktsituation zwischen mineralischen Basiserdstoffen und geosynthetischen Filterelementen}, doi = {10.25643/bauhaus-universitaet.60}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20040310-632}, school = {Bauhaus-Universit{\"a}t Weimar}, year = {1998}, subject = {Bodenfilter}, language = {de} }