Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
Dr. rer. nat. Joachim Bernd Heppelmann,
Prof. Dr. Eric R. Labelle,
Prof. Dr. Stefan Wittkopf
Berechtigungen: Open Access
Berechtigungen: Peer Reviewed
Static and Sliding Frictions of Roundwood Exposed to Different Levels of Processing and Their Impact on Transportation Logistics (2019) Forests 10 (7), S. 1-18.
DOI: 10.3390/f10070568
Load safety is a critical component of successful logistic operations. Different influencing factors can affect the necessity of intensive load securing methods. The most dominant factor is the friction characteristics of the intended cargo. A cargo with special requirements on load safety is debarked roundwood. Due to modern forestry challenges, larger amounts of debarked roundwood assortments are now being produced within German forest operations. To assess the influence of debarking onto the static and sliding frictions of Norway spruce, pulling tests were performed and compared to barked assortments. Results showed that a significant difference in both static and sliding frictions exists between barked and debarked assortments within the first seven days after harvesting. However, this significant difference became less prominent after the logs continued to dry out and no difference was detected after 21 days. Over the monitored period, debarked assortments presented a 40%–45% faster drying rate than barked assortments. This resulted in a calculated 11%–28% additional transportable net load (m3) of debarked roundwood assortments for long trailer systems. Hence, debarked roundwood can be treated similarly to barked roundwood if stored long enough prior to road transportation, while having the potential of increased savings within the wood logistic chain.
Dr. rer. nat. Joachim Bernd Heppelmann,
Prof. Dr. Eric R. Labelle,
Thomas Seifert,
Stefan Seifert,
Prof. Dr. Stefan Wittkopf
Berechtigungen: Open Access
Berechtigungen: Peer Reviewed
Development and Validation of a Photo-Based Measurement System to Calculate the Debarking Percentages of Processed Logs (2019) Remote Sensing 11 (9), S. 1-16.
DOI: 10.3390/rs11091133
Within a research project investigating the applicability and performance of modified harvesting heads used during the debarking of coniferous tree species, the actual debarking percentage of processed logs needed to be evaluated. Therefore, a computer-based photo-optical measurement system (Stemsurf) designed to assess the debarking percentage recorded in the field was developed, tested under laboratory conditions, and applied in live field operations. In total, 1720 processed logs of coniferous species from modified harvesting heads were recorded and analyzed within Stemsurf. With a single log image as the input, the overall debarking percentage was calculated by further estimating the un-displayed part of the log surface by defining polygons representing the differently debarked areas of the log surface. To assess the precision and bias of the developed measurement system, 480 images were captured under laboratory conditions on an artificial log with defined surface polygons. Within the laboratory test, the standard deviation of average debarking percentages remained within a 4% variation. A positive bias of 6.7% was caused by distortion and perspective effects. This resulted in an average underestimation of 1.1% for the summer debarking percentages gathered from field operations. The software generally performed as anticipated through field and lab testing and offered a suitable alternative of assessing stem debarking percentage, a task that should increase in importance as more operations are targeting debarked products.
Prof. Dr. Stefan Wittkopf
Beitrag zur Wuchsleistung und zur Klimaschutzfunktion von Mischwäldern (2018) Gut zu wissen, Bayerischer Rundfunk, Bayerisches Fernsehen .
Prof. Dr. Stefan Wittkopf
Debarking Heads am Harvester – Renaissance der Entrindung im Wald für den Waldschutz? (2018) Informationstagung der Forstwirtschaftlichen Zusammenschlüsse an der Bayerischen Waldbauernschule in Kelheim .
Prof. Dr. Stefan Wittkopf
Energiewende und Waldbiodiversität – Energieholzpotenziale und ihre ökologischen Begrenzungen (2018) Fachkongress Holzenergie 2018, Festung Marienberg Würzburg .
Prof. Dr. Jörg Ewald,
Prof. Dr. Andreas Rothe,
Dr. Miriam Hansbauer,
Christina Schumann,
Dr. rer. nat. Matthias Wilnhammer,
Dr. rer. silv. Fiona Schönfeld,
Prof. Dr. Stefan Wittkopf,
Prof. Dr. Volker Zahner
Energiewende und Waldbiodiversität (2017) BfN-Skripten, Bundesamt für Naturschutz 455 .
Dr. rer. nat. Matthias Wilnhammer,
Prof. Dr. Stefan Wittkopf,
Klaus Richter,
Prof. Dr. Gabriele Weber-Blaschke
Berechtigungen: Peer Reviewed
The impact of a new emission control act on particulate matter emissions from residential wood energy use in Bavaria, Germany (2017) Journal of Cleaner Production 145 , S. 134-141.
DOI: 10.1016/j.jclepro.2017.01.039
Dr. rer. nat. Sebastian Hauk,
Dr. Markus Gandorfer,
Prof. Dr. Stefan Wittkopf,
Ulrike K. Müller,
Prof. Dr. Thomas Knoke
Berechtigungen: Peer Reviewed
Ecological diversification is risk reducing and economically profitable – The case of biomass production with short rotation woody crops in south German land-use portfolios (2017) Biomass and Bioenergy 98 , S. 142-152.
DOI: 10.1016/j.biombioe.2017.01.018
Betreuung der Publikationsseiten
Gerhard Radlmayr
Referent für Wissenstransfer und Forschungskommunikation
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