577 research outputs found

    Prediction of the long-term groundwater recharge by hydropedotransfer functions

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    A method is outlined to predict actual evapotranspiration and groundwater recharge considering climate, soil and depth to groundwater

    Evaluierung potentieller Torfersatzstoffe für den Erwerbsgartenbau mit bodenkundlichen Methoden

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    Mit dem Torfabbau für gartenbauliche Zwecke sind vielfältige negative Auswirkungen verknüpft: Veränderung des Landschaftswasserhaushalts, Treibhausgas-Emissionen, Landschaftswandel, Verlust der biologischen Vielfalt. Der Einsatz von Torfersatzstoffen im Erwerbsgartenbau wie z.B. Rindenhumus, Komposte oder Kokosfasern findet bisher nur in einem geringen Umfang statt, da sie andere Eigenschaften als Torf aufweisen und daher ein potentielles Kulturrisiko darstellen. Zudem können diese Stoffe auch zu ökologischen Problemen führen, z.B. durch lange Transportwege bei der Beschaffung von Kokosfasern. Daher ist es wichtig systematische Untersuchungsverfahren für die Analyse von Torfersatzstoffen mit hoher Kultursicherheit zu entwickeln. Um den Untersuchungsaufwand zu minimieren, soll ein Entscheidungsbaum entwickelt werden, anhand dessen verschiedene Parameter systematisch untersucht werden. Dieser soll schon in frühen Stadien indizieren, ob sich ein Rohstoff als Substratausgangsstoff eignet, bedingt eignet oder verworfen werden muss. Hierzu werden klassische Untersuchungsverfahren (VDLUFA, DIN EN) zur Untersuchung der chemischen, physikalischen und biologischen Eigenschaften der Substratausgangsstoffe eingesetzt wie z.B. zur N-Immobilisierung und zum Wasser- und Lufthaushalt. Diese werden mit bodenkundlichen Methoden wie z.B. Inkubations- und Stabilisotopenversuche kombiniert und weiter entwickelt. Die weiter entwickelten Methoden sollen zu einer verbesserten Aussagefähigkeit bezüglich der Kultursicherheit beitragen. Im Rahmen dieser Studie werden auf diese Weise mehrere potentielle Substratausgangsstoffe (Erle, Schilf, Rohrkolben, Heide) getestet. Es werden erste Ergebnisse der Labor- und Gewächshausversuche dieser potentiellen Substratausgangsstoffe präsentiert

    Glycoconjugate Data Bank:Structures—an annotated glycan structure database and N-glycan primary structure verification service

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    Glycobiology has been brought to public attention as a frontier in the post-genomic era. Structural information about glycans has been accumulating in the Protein Data Bank (PDB) for years. It has been recognized, however, that there are many questionable glycan models in the PDB. A tool for verifying the primary structures of glycan 3D structures is evidently required, yet there have been no such publicly available tools. The Glycoconjugate Data Bank:Structures (GDB:Structures, http://www.glycostructures.jp) is an annotated glycan structure database, which also provides an N-glycan primary structure (or glycoform) verification service. All the glycan 3D structures are detected and annotated by an in-house program named ‘getCARBO’. When an N-glycan is detected in a query coordinate by getCARBO, the primary structure of the glycan is compared with the most similar entry in the glycan primary structure database (KEGG GLYCAN), and unmatched substructure(s) are indicated if observed. The results of getCARBO are stored and presented in GDB:Structures

    Spectroscopic factors for bound s-wave states derived from neutron scattering lengths

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    A simple and model-independent method is described to derive neutron single-particle spectroscopic factors of bound s-wave states in A+1Z=AZn^{A+1}Z = ^{A}Z \otimes n nuclei from neutron scattering lengths. Spectroscopic factors for the nuclei ^{13}C, ^{14}C, ^{16}N, ^{17}O, ^{19}O, ^{23}Ne, ^{37}Ar, and ^{41}Ar are compared to results derived from transfer experiments using the well-known DWBA analysis and to shell model calculations. The scattering length of ^{14}C is calculated from the ^{15}C_{g.s.} spectroscopic factor.Comment: 9 pages (uses revtex), no figures, accepted for publication in PRC, uuencoded tex-files and postscript-files available at ftp://is1.kph.tuwien.ac.at/pub/ohu/Thermal.u

    Reaction rates for Neutron Capture Reactions to C-, N- and O-isotopes to the neutron rich side of stability

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    The reaction rates of neutron capture reactions on light nuclei are important for reliably simulating nucleosynthesis in a variety of stellar scenarios. Neutron capture reaction rates on neutron-rich C-, N-, and O-isotopes are calculated in the framework of a hybrid compound and direct capture model. The results are tabulated and compared with the results of previous calculations as well as with experimental results.Comment: 33 pages (uses revtex) and 9 postscript figures, accepted for publication in Phys. Rev.

    Systematics of Inclusive Photon Production in 158 AGeV Pb Induced Reactions on Ni, Nb, and Pb Targets

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    The multiplicity of inclusive photons has been measured on an event-by-event basis for 158 AGeV Pb induced reactions on Ni, Nb, and Pb targets. The systematics of the pseudorapidity densities at midrapidity (rho_max) and the width of the pseudorapidity distributions have been studied for varying centralities for these collisions. A power law fit to the photon yield as a function of the number of participating nucleons gives a value of 1.13+-0.03 for the exponent. The mean transverse momentum, , of photons determined from the ratio of the measured electromagnetic transverse energy and photon multiplicity, remains almost constant with increasing rho_max. Results are compared with model predictions.Comment: 16 pages including 4 figure
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