@article{HirschmuellerPravidaMarteetal.2018, author = {Hirschm{\"u}ller, Sebastian and Pravida, Johann and Marte, Roman and Flach, Michael}, title = {Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: bonding performance of curved structures in a high-alkaline environment}, series = {Wood Science and Technology}, volume = {52}, journal = {Wood Science and Technology}, number = {5}, editor = {Springer,}, pages = {1289 -- 1311}, year = {2018}, abstract = {Circular hollow sections of beech-laminated veneer lumber (LVL) for the use as temporary geotechnical soil nailing systems are currently being developed. Due to their permanent subsoil cement embedment, investigations of the bond line quality of the timber sections are essential. This paper presents the bonding properties of flat and curved beech LVL after cyclic conditioning in a water-cement grout solution aimed at inducing short- and long-term alkaline attack of the timber. In total, 409 and 69 samples were tested in tensile shear tests after short-term and long-term conditioning, respectively. Three different adhesive systems, a one-component polyurethane adhesive, a melamine-urea-formaldehyde adhesive and a melamine-urea-formaldehyde adhesive modified by means of (polyvinyl)-acetate adhesive were investigated and compared. Short-term conditioning by submersion in boiling cement suspension was found to be a reliable method for testing the bonding performance rather than long-term conditioning. In the case of tensile shear tests of samples subjected to long-term treatment, wood material strength was the decisive criterion. Generally, tensile shear test samples of all investigated adhesives achieved reliable bonding for a pressing force up to 1.0 MPa. No relationship was recognised between the determined bonding failure and the wood properties tensile shear strength, wood failure percentage, fracture pattern and bulk density of veneers adjacent to the bond line. For the determination of the bond line integrity of curved veneer poles, it was necessary to test bonding quality in a combined test using curved and flat samples and to compare tensile shear strength with data determined on reference samples in the same veneer population without bond line.}, language = {en} } @article{HirschmuellerPravidaMarteetal.2018, author = {Hirschm{\"u}ller, Sebastian and Pravida, Johann and Marte, Roman and Flach, Michael}, title = {Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: development and evaluation of a test method for curved structures in a high-alkaline environment}, series = {Wood Science and Technology}, volume = {52}, journal = {Wood Science and Technology}, number = {4}, editor = {Springer,}, pages = {1061 -- 1092}, year = {2018}, abstract = {Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timber structures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.}, language = {en} } @article{KamjunkeBuettnerJaegeretal.2013, author = {Kamjunke, N. and B{\"u}ttner, O. and J{\"a}ger, Christoph G. and Marcus, H. and von T{\"u}mpling, W. and Halbedel, S. and Norf, H. and Brauns, M. and Baborowski, M. and Wild, R. and Borchardt, D. and Weitere, M.}, title = {Biogeochemical patterns in a river network along a land use gradient}, series = {Environmental Monitoring and Assessment}, volume = {185}, journal = {Environmental Monitoring and Assessment}, number = {11}, pages = {9221 -- 9236}, year = {2013}, abstract = {The Bode catchment (Germany) shows strong land use gradients from forested parts of the National Park (23 \% of total land cover) to agricultural (70 \%) and urbanised areas (7 \%). It is part of the Terrestrial Environmental Observatories of the German Helmholtz association. We performed a biogeochemical analysis of the entire river network. Surface water was sampled at 21 headwaters and at ten downstream sites, before (in early spring) and during the growing season (in late summer). Many parameters showed lower concentrations in headwaters than in downstream reaches, among them nutrients (ammonium, nitrate and phosphorus), dissolved copper and seston dry mass. Nitrate and phosphorus concentrations were positively related to the proportion of agricultural area within the catchment. Punctual anthropogenic loads affected some parameters such as chloride and arsenic. Chlorophyll a concentration and total phosphorus in surface waters were positively related. The concentration of dissolved organic carbon (DOC) was higher in summer than in spring, whereas the molecular size of DOC was lower in summer. The specific UV absorption at 254 nm, indicating the content of humic substances, was higher in headwaters than in downstream reaches and was positively related to the proportion of forest within the catchment. CO2 oversaturation of the water was higher downstream compared with headwaters and was higher in summer than in spring. It was correlated negatively with oxygen saturation and positively with DOC concentration but negatively with DOC quality (molecular size and humic content). A principle component analysis clearly separated the effects of site (44 \%) and season (15 \%), demonstrating the strong effect of land use on biogeochemical parameters.}, language = {en} } @article{JaegerHagemannBorchardt2017, author = {J{\"a}ger, Christoph G. and Hagemann, J. and Borchardt, D.}, title = {Can nutrient pathways and biotic interactions control eutrophication in riverine ecosystems? Evidence from a model driven mesocosm experiment}, series = {Water Research}, volume = {115}, journal = {Water Research}, pages = {162 -- 171}, year = {2017}, abstract = {Ecological theory predicts that the relative importance of benthic to planktonic primary production usually changes along the rivers' continuum from a predomination of benthic algae in lower stream orders to a predomination of planktonic algae at higher orders. Underlying mechanisms driving the interaction between algae in these habitats, its controlling factors and consequences for riverine ecosystems are, however, only partly understood. We present a mechanistic analysis of the governing ecological processes using a simplified, numerical model and examine how abiotic factors and biotic interactions influence benthic and planktonic algae by changing resource competition. We compare the outcome of the model with the results of a factorial mesocosm experiment mimicking the parameter spaces of the model. The results show a remarkable similarity with regard to the temporal development of benthic and pelagic algal biomass and shifting dominance patterns. In particular we analyse the effects of the pathways of nutrient supply (upwelling from the hyporheic zone, direct supply to the surface water, or via both pathways) and grazing in a gradient of river depths. Our results show that detachment of benthic algae, sinking of planktonic algae and the pathway of nutrient supply are key processes determining the respective algal biomass distributions particularly in shallow and intermediate deep systems. Increasing nutrient supply increases algal biomasses, but does not change the general pattern of the interactions. Decreasing light supply decreases the dominance of planktonic algae, but increases dissolved nutrients. At intermediate to high grazing rates algal biomass can be controlled by grazers, but however, at high grazing rates, dissolved nutrients accumulate in the surface water. Our results indicate that nutrient pathways, resource competition and internal control by grazing need to be considered explicitly for the understanding and explanation of eutrophication phenomena in riverine ecosystems. As a consequence, ecologically effective eutrophication management of running water systems has to go beyond the control of nutrient emissions or the achievement of limiting threshold values in the receiving waters, but requires the consideration of the nutrient pathways (surface water versus groundwater) and the shifting biological controls from lower to higher order stream ecosystems.}, language = {en} } @article{DupasMusolffJawitzetal.2017, author = {Dupas, R. and Musolff, A. and Jawitz, J. W. and Rao, P. S. C. and J{\"a}ger, Christoph G. and Fleckenstein, J. H. and Rode, M. and Borchardt, D.}, title = {Carbon and nutrient export regimes from headwater catchments to downstream reaches}, series = {Biogeosciences}, volume = {14}, journal = {Biogeosciences}, number = {18}, pages = {4391 -- 4407}, year = {2017}, abstract = {Excessive amounts of nutrients and dissolved organic matter in freshwater bodies affect aquatic ecosystems. In this study, the spatial and temporal variability in nitrate (NO3-), dissolved organic carbon (DOC) and soluble reactive phosphorus (SRP) was analyzed in the Selke (Germany) river continuum from three headwaters draining 1-3 km2 catchments to two downstream reaches representing spatially integrated signals from 184-456 km2 catchments. Three headwater catchments were selected as archetypes of the main landscape units (land use  ×  lithology) present in the Selke catchment. Export regimes in headwater catchments were interpreted in terms of NO3-, DOC and SRP land-to-stream transfer processes. Headwater signals were subtracted from downstream signals, with the differences interpreted in terms of in-stream processes and contributions from point sources. The seasonal dynamics for NO3- were opposite those of DOC and SRP in all three headwater catchments, and spatial differences also showed NO3- contrasting with DOC and SRP. These dynamics were interpreted as the result of the interplay of hydrological and biogeochemical processes, for which riparian zones were hypothesized to play a determining role. In the two downstream reaches, NO3- was transported almost conservatively, whereas DOC was consumed and produced in the upper and lower river sections, respectively. The natural export regime of SRP in the three headwater catchments mimicked a point-source signal (high SRP during summer low flow), which may lead to overestimation of domestic contributions in the downstream reaches. Monitoring the river continuum from headwaters to downstream reaches proved effective to jointly investigate land-to-stream and in-stream transport, and transformation processes.}, language = {en} } @inproceedings{SchemmeDittmarKarlingeretal.2019, author = {Schemme, Michael and Dittmar, Harri and Karlinger, Peter and Hummel, Sabine}, title = {Closed-Loop-Recycling - Strategien f{\"u}r endlosfaserverst{\"a}rkte thermoplastische Hybridstrukturen (Vortrag)}, series = {FOREL Kolloquium}, booktitle = {FOREL Kolloquium}, year = {2019}, language = {de} } @techreport{AlversammerAngermeierBernhardtetal.2013, author = {Alversammer, Wolfgang and Angermeier, Martin and Bernhardt, Andreas and Bischof, Wolfgang and Botsch, Rafael and Eierle, Benno and Feldmeier, Franz and Hack, Andreas and Hauck-Bauer, Eva and Heigl, Martin and K{\"o}lzer, Brigitte and K{\"o}ster, Heinrich and Krose, Eva and Leps, Torsten and Mennicken, Titus and Muscat, Drik and Ober, Thorsten and Ott, Robert and Ruminski, Nils and Seidlmeier, Heinrich and Stauss, Kilian and Stetter, Andrea and Viehhauser, Peter and Wambsganß, Mathias and Zagler, Stefan and Zauner, Johannes and Zentgraf, Peter}, title = {Forschungsbericht 2012}, organization = {Hochschule Rosenheim}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-12338}, pages = {48}, year = {2013}, abstract = {Mit dem j{\"a}hrlich erscheinenden Forschungsbericht m{\"o}chte die Hochschule Rosenheim einen Einblick in ihre vielf{\"a}ltigen Projekte und Aktivit{\"a}ten der angewandten Forschung und Entwicklung geben. Im Forschungsbericht 2012 wird {\"u}ber Vorhaben im Jahr 2012 berichtet.}, language = {de} } @techreport{AckermannAngermeierAueretal.2014, author = {Ackermann, Timo and Angermeier, Martin and Auer, Veronika and Beneken, Gerd and Bernhardt, Andreas and Botsch, Rafael and B{\"u}cker, Dominikus and Hager, Ralf and Hauck-Bauer, Eva and Heigl, Martin and Hirschm{\"u}ller, Sebastian and H{\"o}llm{\"u}ller, Janett and Karlinger, Peter and K{\"o}ster, Heinrich and Krause, Harald and Kucich, Martin and Matthias, Kira and Patzl, Victoria and Pl{\"o}nnigs, Ren{\´e} and Posch, Georg and Schanda, Ulrich and Scheerer, Josua and Schlecht, Johannes and Schmidt, Jochen and Stichler, Markus and Uhl, Cornelius and Viehhauser, Peter and Weber, Gabriel and Wolf, Christopher and Zagler, Stefan and Zentgraf, Peter}, title = {Forschungsbericht 2013}, organization = {Hochschule Rosenheim}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-12324}, pages = {56}, year = {2014}, abstract = {Mit dem j{\"a}hrlich erscheinenden Forschungsbericht m{\"o}chte die Hochschule Rosenheim einen Einblick in ihre vielf{\"a}ltigen Projekte und Aktivit{\"a}ten der angewandten Forschung und Entwicklung geben. Im Forschungsbericht 2013 wird {\"u}ber Vorhaben im Jahr 2013 berichtet.}, language = {de} } @techreport{BauerBeneckenBueckeretal.2015, author = {Bauer, Lucia and Benecken, Gerd and B{\"u}cker, Dominikus and Buff, Alexander and Carlton, Katrina and Feldmeier, Franz and Flatscher, Simon and Hack, Andreas and Halt, Manfred and Jell, Peter and K{\"o}ster, Heinrich and Kucich, Martin and Manzinger, Franziska and Mecking, Simon and Paus, Inger and Rex, Steffen and Schanda, Ulrich and Schreyer, Manuela and Spindler, Uli and Stadler, Constanze and Stahnke, Svenja and Stiegler, Gertrud and Walser, Georg and Wambsganß, Mathias and Wellisch, Ulrich}, title = {Forschungsbericht 2014}, organization = {Hochschule Rosenheim}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-12317}, pages = {68}, year = {2015}, abstract = {Mit dem j{\"a}hrlich erscheinenden Forschungsbericht m{\"o}chte die Hochschule Rosenheim einen Einblick in ihre vielf{\"a}ltigen Projekte und Aktivit{\"a}ten der angewandten Forschung und Entwicklung geben. Im Forschungsbericht 2014 wird {\"u}ber Vorhaben im Jahr 2014 berichtet.}, language = {de} } @techreport{BarthBeneckenBetzetal.2016, author = {Barth, Simon and Benecken, Gerd and Betz, Andreas and Binninger, Karsten and Graule, Verena and Hack, Andreas and Haegele, Rainer and Hartmann, Markus and Hauck-Bauer, Eva and Haut, Sandra and J{\"a}ger, Johannes and Kagerl, Andreas and Karlinger, Peter and Konle, Elke and K{\"o}ster, Heinrich and Krause, Harald and Krommes, Sandra and Meissner, Thomas and Michanickl, Andreas and Sandor, Viktor and Schanda, Ulrich and Schemme, Michael and Sebald, Daniela and Spindler, Uli and Stauss, Kilian and Strobl, Thomas and Sussmann, Monika and Versen, Martin and Voit, Johann and Wambsganß, Mathias and Wellisch, Ulrich and Zauner, Johannes}, title = {Forschungsbericht 2015}, organization = {Hochschule Rosenheim}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-12304}, pages = {76}, year = {2016}, abstract = {Mit dem j{\"a}hrlich erscheinenden Forschungsbericht m{\"o}chte die Hochschule Rosenheim einen Einblick in ihre vielf{\"a}ltigen Projekte und Aktivit{\"a}ten der angewandten Forschung und Entwicklung geben. Im Forschungsbericht 2015 wird {\"u}ber Vorhaben im Jahr 2015 berichtet.}, language = {de} }