@article{ButenwegGellertSchlundt2010, author = {Butenweg, Christoph and Gellert, Christoph and Schlundt, Andreas}, title = {Nichtlinearer Erdbebennachweis von Geb{\"a}uden aus Kalksandsteinmauerwerk nach DIN EN 1998}, series = {Mauerwerk : European journal of masonry}, volume = {14}, journal = {Mauerwerk : European journal of masonry}, number = {3}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {1432-3427}, doi = {10.1002/dama.201000463}, pages = {120 -- 125}, year = {2010}, abstract = {Die Erdbebensicherheit von Geb{\"a}uden aus Kalksandsteinmauerwerk ist aktuell nach DIN 4149 mit linearen Verfahren nachzuweisen. Dies f{\"u}hrt in der praktischen Anwendung zu großen Problemen, da selbst traditionell {\"u}bliche Grundrisse teilweise nicht mehr ohne zus{\"a}tzliche Maßnahmen nachweisbar sind. Zur L{\"o}sung dieser Problematik wurden von der deutschen Mauerwerksindustrie auf nationaler und europ{\"a}ischer Ebene Forschungsprojekte initiiert, deren Ergebnisse in Form von statisch nichtlinearen Verfahren Eingang in den Nationalen Anhang zur DIN EN 1998-1 [12] gefunden haben. Mit den Verfahren wird die Nachweissituation zuk{\"u}nftig grundlegend verbessert, da mit diesen die Tragwerksreserven wesentlich besser ausgenutzt werden k{\"o}nnen. Im Folgenden wird die Anwendung der Verfahren am Beispiel einer Reihenhauszeile aus Kalksandsteinmauerwerk demonstriert. Der Nachweis der Reihenh{\"a}user wurde im Rahmen einer Zustimmung im Einzelfall, die vom Bundesverband Kalksandsteinindustrie eV in Hannover koordiniert wurde, durch unabh{\"a}ngige Gutachter und die Bauaufsicht eingehend gepr{\"u}ft und f{\"u}r richtig befunden. Die Durchf{\"u}hrung des Nachweises erfolgte auf Grundlage eines an der RWTH Aachen entwickelten neuen Nachweiskonzeptes. Die baupraktische Anwendbarkeit und einfache Nachvollziehbarkeit dieses Konzepts ist durch eine softwaretechnische Umsetzung sichergestellt.}, language = {de} } @article{ButenwegFaeckeFehlingetal.2010, author = {Butenweg, Christoph and F{\"a}cke, Andreas and Fehling, Ekkehard and Gellert, Christoph and Gierga, Michael and Meyer, Udo and R{\"u}tschlin, Andreas H. and St{\"u}rz, Jochen}, title = {Energieeffizient und erdbebensicher Bauen mit monolithischem Ziegelmauerwerk}, series = {Mauerwerk : European journal of masonry}, volume = {14}, journal = {Mauerwerk : European journal of masonry}, number = {1}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {1432-3427}, doi = {10.1002/dama.201000456}, pages = {3 -- 9}, year = {2010}, abstract = {Moderne Bauwerke m{\"u}ssen heute eine hohe energetische Leistungsf{\"a}higkeit aufweisen und gleichzeitig alle einwirkenden Lasten sicher abtragen. Dies stellt insbesondere in Erdbebengebieten hohe Anforderungen an die verwendeten Baustoffe. Am baupraktischen Beispiel einer Doppelhaush{\"a}lfte wird demonstriert, dass die Symbiose aus energieeffizientem und gleichzeitig erdbebensicherem Bauen in der h{\"o}chsten deutschen Erdbebenzone mit monolithischem Ziegelmauerwerk gut realisierbar ist. Als Ziegelmauerwerk werden f{\"u}r die Außenw{\"a}nde w{\"a}rmetechnisch optimierte Hochlochziegel verwendet, die sowohl die Anforderungen der Energieeinsparverordnung 2009 als auch die Anforderungen an Mauerwerkbaustoffe nach den aktuellen Erdbebennormen erf{\"u}llen. Der Erdbebennachweis der Doppelhaush{\"a}lfte erfolgt mit einem nichtlinearen Nachweisverfahren, das f{\"u}r eine einfache praktische Anwendung programmtechnisch umgesetzt wurde. F{\"u}r den Nachweis wurden aus zyklischen Schubwandversuchen ermittelte Last-Verformungskurven verwendet. Das gesamte in Deutschland noch nicht normativ geregelte Nachweiskonzept wurde im Rahmen einer Zustimmung im Einzelfall gepr{\"u}ft und genehmigt.}, language = {de} } @article{Kirsch2010, author = {Kirsch, Ansgar}, title = {Experimental investigation of the face stability of shallow tunnels in sand}, series = {Acta Geotechnica}, volume = {5}, journal = {Acta Geotechnica}, number = {1}, publisher = {Springer}, address = {Berlin}, issn = {1861-1125}, doi = {10.1007/s11440-010-0110-7}, pages = {43 -- 62}, year = {2010}, abstract = {Various models have been proposed for the prediction of the necessary support pressure at the face of a shallow tunnel. To assess their quality, the collapse of a tunnel face was modelled with small-scale model tests at single gravity. The development of the failure mechanism and the support force at the face in dry sand were investigated. The observed displacement patterns show a negligible influence of overburden on the extent and evolution of the failure zone. The latter is significantly influenced, though, by the initial density of the sand: in dense sand a chimney-wedge-type collapse mechanism developed, which propagated towards the soil surface. Initially, loose sand did not show any discrete collapse mechanism. The necessary support force was neither influenced by the overburden nor the initial density. A comparison with quantitative predictions by several theoretical models showed that the measured necessary support pressure is overestimated by most of the models. Those by Vermeer/Ruse and L{\´e}ca/Dormieux showed the best agreement to the measurements.}, language = {en} } @article{BolikLinzbach2010, author = {Bolik, Andreas and Linzbach, Meike}, title = {Verluste und Zinsschranke in der Bilanzierung latenter Steuern}, series = {Deutsches Steuerrecht : DStR ; Wochenschrift \& umfassende Datenbank f{\"u}r Steuerberater ; Steuerrecht, Wirtschaftsrecht, Betriebswirtschaft, Beruf ; Organ der Bundessteuerberaterkammer}, volume = {48}, journal = {Deutsches Steuerrecht : DStR ; Wochenschrift \& umfassende Datenbank f{\"u}r Steuerberater ; Steuerrecht, Wirtschaftsrecht, Betriebswirtschaft, Beruf ; Organ der Bundessteuerberaterkammer}, number = {31}, publisher = {Beck}, address = {M{\"u}nchen}, issn = {0012-1347}, pages = {1587 -- 1590}, year = {2010}, abstract = {Latente Steuern stellen eine Schnittstelle zwischen handelsrechtlicher Rechnungslegung und Steuerrecht dar. Das Verh{\"a}ltnis von Handels- und Steuerrecht ist dabei keinesfalls stetig; vielmehr fordert die Dynamik des deutschen Steuerrechts in vielen Bereichen regelm{\"a}ßige Anpassungen in der Bilanzierung in Handels- und Steuerbilanz. Dies gilt insbesondere f{\"u}r die Bilanzierung latenter Steuern im handelsrechtlichen Jahresabschluss, welche durch das BilMoG deutlich an Bedeutung gewonnen hat. Neben latenten Steuern auf tempor{\"a}re Differenzen ist es nunmehr erforderlich, Verlustvortr{\"a}ge und die Folgen der Zinsschranke bei der Berechnung latenter Steuern zu ber{\"u}cksichtigen. Der nachfolgende Beitrag geht auf die Ber{\"u}cksichtigung von Verlust- und Zinsvortr{\"a}gen und die Ber{\"u}cksichtigungsf{\"a}higkeit von EBITDA-Vortr{\"a}gen bei der Berechnung latenter Steuern ein und beleuchtet dabei insbesondere auch praktische Fragestellungen.}, language = {de} } @article{FellinKingKirschetal.2010, author = {Fellin, Wolfgang and King, Julian and Kirsch, Ansgar and Oberguggenberger, Michael}, title = {Uncertainty modelling and sensitivity analysis of tunnel face stability}, series = {Structural safety}, volume = {32}, journal = {Structural safety}, number = {6}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0167-4730}, doi = {10.1016/j.strusafe.2010.06.001}, pages = {402 -- 410}, year = {2010}, abstract = {This paper proposes an approach to the choice and evaluation of engineering models with the aid of a typical application in geotechnics. An important issue in the construction of shallow tunnels, especially in weak ground conditions, is the tunnel face stability. Various theoretical and numerical models for predicting the necessary support pressure have been put forth in the literature. In this paper, we combine laboratory experiments performed at the University of Innsbruck with current methods of uncertainty and sensitivity analysis for assessing adequacy, predictive power and robustness of the models. The major issues are the handling of the twofold uncertainty of test results and of model predictions as well as the decision about what are the influential input parameters.}, language = {en} } @article{FleischhakerEversDey2010, author = {Fleischhaker, Robert and Evers, J{\"o}rg and Dey, Tarak N.}, title = {Phase modulation induced by cooperative effects in electromagnetically induced transparency}, series = {Physical Review A - Atomic, molecular, and optical physics}, volume = {82}, journal = {Physical Review A - Atomic, molecular, and optical physics}, number = {1}, publisher = {AIP Publishing}, address = {Melville, NY}, issn = {1050-2947}, doi = {10.1103/PhysRevA.82.013815}, pages = {013815}, year = {2010}, abstract = {We analyze the influence of dipole-dipole interactions in an electromagnetically induced transparency set up for a density at the onset of cooperative effects. To this end, we include mean-field models for the influence of local-field corrections and radiation trapping into our calculation. We show both analytically and numerically that the polarization contribution to the local field strongly modulates the phase of a weak pulse. We give an intuitive explanation for this local-field-induced phase modulation and demonstrate that it distinctively differs from the nonlinear self-phase-modulation that a strong pulse experiences in a Kerr medium.}, language = {en} } @article{MottaghyPechnigTaugsetal.2010, author = {Mottaghy, Darius and Pechnig, Renate and Taugs, Renate and Kr{\"o}ger, Jens and Thomsen, Claudia and Hesse, Fabian and Liebsch-Doerschner, Thomas}, title = {Erstellung eines geothermischen Modells f{\"u}r Teile Hamburgs und anliegende Gebiete}, series = {BBR - Fachmagazin f{\"u}r Brunnen- und Leitungsbau}, volume = {61}, journal = {BBR - Fachmagazin f{\"u}r Brunnen- und Leitungsbau}, number = {12}, publisher = {WVGW Wirtschafts- u. Verl.Ges. Gas und Wasser}, address = {Bonn}, issn = {1611-1478}, pages = {52 -- 59}, year = {2010}, language = {de} } @article{Butenweg2010, author = {Butenweg, Christoph}, title = {Bewertung der Erdbebensicherheit von bestehenden Bauwerken}, series = {{\"O}sterreichische Ingenieur- und Architekten-Zeitschrift : {\"O}IAZ ; Zeitschr. d. {\"O}IAV / {\"O}sterreichischer Ingenieur- und Architekten-Verein}, volume = {155}, journal = {{\"O}sterreichische Ingenieur- und Architekten-Zeitschrift : {\"O}IAZ ; Zeitschr. d. {\"O}IAV / {\"O}sterreichischer Ingenieur- und Architekten-Verein}, number = {1-3 und 4-6}, publisher = {{\"O}AIV}, address = {Wien}, issn = {0721-9415}, pages = {11 -- 17}, year = {2010}, language = {de} } @article{FontivonArxGarciaGonzalezetal.2010, author = {Fonti, Patrick and von Arx, Georg and Garc{\´i}a-Gonz{\´a}lez, Ignacio and Eilmann, Britta and Sass-Klaassen, Ute G. W. and G{\"a}rtner, Holger and Eckstein, Dieter}, title = {Studying global change through investigation of the plastic responses of xylem anatomy in tree rings}, series = {New Phytologist}, volume = {185}, journal = {New Phytologist}, number = {1}, publisher = {Wiley-Blackwell}, address = {Oxford}, issn = {1469-8137 (Online)}, doi = {10.1111/j.1469-8137.2009.03030.x}, pages = {42 -- 53}, year = {2010}, abstract = {Variability in xylem anatomy is of interest to plant scientists because of the role water transport plays in plant performance and survival. Insights into plant adjustments to changing environmental conditions have mainly been obtained through structural and functional comparative studies between taxa or within taxa on contrasting sites or along environmental gradients. Yet, a gap exists regarding the study of hydraulic adjustments in response to environmental changes over the lifetimes of plants. In trees, dated tree-ring series are often exploited to reconstruct dynamics in ecological conditions, and recent work in which wood-anatomical variables have been used in dendrochronology has produced promising results. Environmental signals identified in water-conducting cells carry novel information reflecting changes in regional conditions and are mostly related to short, sub-annual intervals. Although the idea of investigating environmental signals through wood anatomical time series goes back to the 1960s, it is only recently that low-cost computerized image-analysis systems have enabled increased scientific output in this field. We believe that the study of tree-ring anatomy is emerging as a promising approach in tree biology and climate change research, particularly if complemented by physiological and ecological studies. This contribution presents the rationale, the potential, and the methodological challenges of this innovative approach.}, language = {en} } @article{DobbertinEilmannBleuleretal.2010, author = {Dobbertin, Matthias and Eilmann, Britta and Bleuler, Peter and Giuggiola, Arnaud and Graf Pannatier, Elisabeth and Landolt, Werner and Schleppi, Patrick and Rigling, Andreas}, title = {Effect of irrigation on needle morphology, shoot and stem growth in a drought-exposed Pinus sylvestris forest}, series = {Tree Physiology}, volume = {30}, journal = {Tree Physiology}, number = {3}, publisher = {Oxford University Press}, address = {Oxford}, issn = {1758-4469 (Online)}, doi = {10.1093/treephys/tpp123}, pages = {346 -- 360}, year = {2010}, abstract = {In Valais, Switzerland, Scots pines (Pinus sylvestris L.) are declining, mainly following drought. To assess the impact of drought on tree growth and survival, an irrigation experiment was initiated in 2003 in a mature pine forest, approximately doubling the annual precipitation. Tree crown transparency (lack of foliage) and leaf area index (LAI) were annually assessed. Seven irrigated and six control trees were felled in 2006, and needles, stem discs and branches were taken for growth analysis. Irrigation in 2004 and 2005, both with below-average precipitation, increased needle size, area and mass, stem growth and, with a 1-year delay, shoot length. This led to a relative decrease in tree crown transparency (-14\%) and to an increase in stand LAI (+20\%). Irrigation increased needle length by 70\%, shoot length by 100\% and ring width by 120\%, regardless of crown transparency. Crown transparency correlated positively with mean needle size, shoot length and ring width and negatively with specific leaf area. Trees with high crown transparency (low growth, short needles) experienced similar increases in needle mass and growth with irrigation than trees with low transparency (high growth, long needles), indicating that seemingly declining trees were able to 'recover' when water supply became sufficient. A simple drought index before and during the irrigation explained most of the variation found in the parameters for both irrigated and control trees.}, language = {en} }