@article{LorenzGersterWodzinowskietal.2022, author = {Lorenz, Tommy and Gerster, Lea and Wodzinowski, Dustin Elias and Wartenberg, Ariani and Martetschl{\"a}ger, Lea and Molitor, Heike and Cremer, Tobias and Bloch, Ralf}, title = {Innovative Teaching and Learning Formats for the Implementation of Agroforestry Systems—An Impact Analysis after Five Years of Experience with the Real-World Laboratory "Ackerbaum"}, series = {Forests}, volume = {13}, journal = {Forests}, number = {7}, publisher = {MDPI}, issn = {1999-4907}, doi = {10.3390/f13071064}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-3092}, pages = {14}, year = {2022}, abstract = {Since 2017, the Eberswalde University for Sustainable Development (HNEE) offers transformative learning modules in their curricula, which are called ITL—Innovative Teaching and Learning formats. Student tutors change into the role of teachers and organize lectures, excursions, and assignments at the Real-World Laboratory "Ackerbaum"—an agroforestry system in the federal state of Brandenburg, Germany. Students can learn about agroforestry systems, participate in research, and take practical action. The examination of the module is a scientific report linked to the experimental area. In this study, an attempt was made to verify the quality and impact of teaching formats in the ITL via the analysis of 53 reports created by 170 students as well as surveys among participants. For this purpose, indicators were formulated that capture the quality of scientific methods and the contribution to higher education for sustainable development. Students and tutors appreciate the open working atmosphere and the possibility to actively participate in the course; many leave the module motivated. Some even move toward transformation in agriculture professionally as, e.g., consultants in the field of agroforestry. As a transformative institution, HNEE offers with ITL a rare opportunity for practical application, scientific methods, and transdisciplinary collaboration with different stakeholders to work on future models to change today's agriculture.}, language = {en} } @article{deMiguelDiezGuiguePettenkoferetal.2022, author = {de Miguel-D{\´i}ez, Felipe and Guigue, Phillippe and Pettenkofer, Tim and Tolosana-Esteban, Eduardo and Purf{\"u}rst, Thomas and Cremer, Tobias}, title = {Development and evaluation of a novel 3D simulation software for modelling wood stacks}, series = {PLoS ONE}, journal = {PLoS ONE}, number = {17(3)}, issn = {1932-6203}, doi = {10.1371/journal.pone.0264414}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-4472}, pages = {17}, year = {2022}, abstract = {Assessing the solid wood content is crucial when acquiring stacked roundwood. A frequently used method for this is to multiply determined conversion factors by the measured gross volume. However, the conversion factors are influenced by several log and stack parameters. Although these parameters have been identified and studied, their individual influence has not yet been analyzed using a broad statistical basis. This is due to the considerable financial resources that the data collection entails. To overcome this shortcoming, a 3D-simulation model was developed. It generates virtual wood stacks of randomized composition based on one individual data set of logs, which may be real or defined by the user. In this study, the development and evaluation of the simulation model are presented. The model was evaluated by conducting a sensitivity and a quantitative analysis of the simulation outcomes based on real measurements of 405 logs of Norway spruce and 20 stacks constituted with these. The results of the simulation outcomes revealed a small overestimation of the net volume of real stacks: by 1.2\% for net volume over bark and by 3.2\% for net volume under bark. Furthermore, according to the calculated mean bias error (MBE), the model underestimates the gross volume by 0.02\%. In addition, the results of the sensitivity analysis confirmed the capability of the model to adequately consider variations in the input parameters and to provide reliable outcomes.}, language = {en} } @article{deMiguelDiezPettenkoferWalloretal.2022, author = {de Miguel-D{\´i}ez, Felipe and Pettenkofer, Tim and Wallor, Evelyn and Tolosana-Esteban, Eduardo and Purf{\"u}rst, Thomas and Cremer, Tobias}, title = {Influence of log and stack parameters on the conversion factors for Norway Spruce wood stacks using a 3D simulation model}, series = {International Journal of Forest Engineering}, volume = {33}, journal = {International Journal of Forest Engineering}, number = {2}, publisher = {Taylor \& Francis}, issn = {1494-2119}, doi = {10.1080/14942119.2022.2038023}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-4482}, pages = {119 -- 128}, year = {2022}, abstract = {One method for estimating the solid wood content in a stack involves using conversion factors and multiplying these by the measured gross volume. The conversion factors can vary depending on several log and stack parameters. The aim of this study was to analyze eleven parameters using a 3D simulation model based on 541 measured logs of Norway spruce. To this end, 50 data sets were created from measured logs, where the parameters of interest in this study (e.g., length, crookedness, taper …) were classified according to different ranges. After that, 64 runs of simulations were carried out. In each simulation run, 150 stacks were modeled. The simulation results were compared with previous studies and with the measurement guidelines of several countries. This analysis revealed that the parameters midpoint diameter, length, crookedness, delimbing quality and the proportion of moderately and highly crooked logs in a stack have a considerable influence on the conversion factors. Taper, proportion of butt logs in a stack and stack height have a modest effect as do the proportion of tapered and crooked logs for low and high taper and low crookedness. In contrast, ovality and the proportion of logs stacked in opposite directions have a marginal influence on the conversion factors. Based on findings from these analyses, the current measurement guidelines of different countries can now be adapted to achieve a higher degree of accuracy.}, language = {en} } @article{deMiguelDiezRederWalloretal.2022, author = {de Miguel-D{\´i}ez, Felipe and Reder, Stefan and Wallor, Evelyn and Bahr, Henrik and Blasko, Lubomir and Mund, Jan-Peter and Cremer, Tobias}, title = {Further application of using a personal laser scanner and simultaneous localization and mapping technology to estimate the log's volume and its comparison with traditional methods}, series = {International Journal of Applied Earth Observation and Geoinformation}, journal = {International Journal of Applied Earth Observation and Geoinformation}, number = {109}, publisher = {Elsevier}, issn = {1872-826X}, doi = {10.1016/j.jag.2022.102779}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-4496}, pages = {7}, year = {2022}, abstract = {The aim of this study was the development of a methodical processing line for estimating the log's volume from scanning logs using a long-range high-speed personal laser scanner (PLS) GeoSLAM ZEB HORIZON and simultaneous localization and mapping (SLAM) technology in an open-source software framework of Cloud Compare. Additionally, the accuracy and precision of using PLS and the suggested method when measuring roundwood volume was examined compared to measurements made using a xylometer and estimations obtained from applying the formulae of Huber, Smalian and Newton. For this purpose, several parameters were measured in 50 logs of Norway spruce with an average length of 2.53 m and a mean diameter of 19.97 cm. Afterwards, the volume of these 50 logs was measured with a xylometer. The results of these measurements served as reference values. The same 50 logs were subsequently scanned with the PLS. The scans were converted into point clouds and were analyzed in Cloud Compare to estimate the volume of the scanned logs. Next, the root mean square error (RMSE) and the mean bias error (MBE) as well as their relative values were calculated for the volumes determined in Cloud Compare and estimated with the above mentioned formulae. The calculated RMSE (and relative RMSE) determined a deviation of the logs' volumes estimated in Cloud Compare from the xylometric volumes of 2.88 dm3 (3.54\%) whereas the deviations of the log's volumes calculated applying the formulae of Huber, Smalian and Newton from the xylometric volumes were respectively 9.63 dm3 (11.83\%), 10.33 dm3 (12.69\%) and 4.69 dm3 (5.76\%). The calculated MBE (and relative MBE) showed that the estimated volumes in Cloud Compare and those using the formulae were overestimated, with the lowest overestimation of 0.10 dm3 (0.12\%) in Cloud Compare and the highest, 5.50 dm3 (6.75\%), using the Smalian formula. Therefore, it can be stated that results of suggested methodical processing line came closest to the logs' volumes obtained with the xylometer, i.e., they were more accurate and precise compared to the conventionally formulae for log's volume estimation. The implementation of this method has the potential filling a gap towards a wall-to-wall complete digitization of the roundwood commercialization and ensure transparency and acceptance between the stakeholders involved in the wood supply chain.}, language = {en} } @article{GrimpeLuckeLorenzetal.2022, author = {Grimpe, J. and Lucke, S. and Lorenz, T. and Bloch, Ralf and Cremer, Tobias}, title = {Agroforst auf trockenen B{\"o}den. On-Farm-Versuch in Brandenburg}, series = {LUMBRICO: konservierender {\"o}kologischer Landbau}, journal = {LUMBRICO: konservierender {\"o}kologischer Landbau}, number = {11}, publisher = {Emminger \& Partner GmbH}, address = {Berlin}, issn = {1432-9387}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-6441}, pages = {41 -- 45}, year = {2022}, abstract = {Die Anlage von Agroforstsystemen (AFS) wird seit einigen Jahren, auch in Deutschland, als Methode der Aufbauenden Landwirtschaft angesehen. Die Hochschule f{\"u}r nachhaltige Entwicklung Eberswalde (HNEE) erprobt diese Bewirtschaftungsform unter realen Bedingungen, im laufenden Gesch{\"a}ft eines Landwirtschaftsbetriebes - in einem sogenannten „Reallabor".}, language = {de} } @inproceedings{BlochCremerWartenbergetal.2022, author = {Bloch, Ralf and Cremer, Tobias and Wartenberg, Ariani and Molitor, Heike and Lorenz, Tommy}, title = {Innovative Lehr- und Lernform zur Implementierung eines Agroforstsystems - 4 Jahre Erfahrungen aus dem Reallabor „Ackerbaum"}, series = {Nachhaltig wirken: Reallabore in der Transformation}, booktitle = {Nachhaltig wirken: Reallabore in der Transformation}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-6736}, year = {2022}, abstract = {Das Wahlpflichtmodul Agroforst wird an der Hochschule f{\"u}r nachhaltige Entwicklung Eberswalde als innovative Lehr- und Lernform, kurz ILL, von Studierenden f{\"u}r Studierende durchgef{\"u}hrt. Im Sinne einer offenen Lehrwerkstatt ist das Modul interdisziplin{\"a}r ausgerichtet und f{\"u}r Bachelor- und Masterstudierende verschiedener Studieng{\"a}nge anw{\"a}hlbar. Die studentischen Tutor:innen werden von zwei Professoren der Hochschule begleitet. Angeschlossen an das Modul ist neben Vortr{\"a}gen und Exkursionen die Forschung im Reallabor „Ackerbaum" wodurch transdisziplin{\"a}res Arbeiten vermittelt wird. Dabei handelt es sich um eine knapp 10 Hektar große Ackerfl{\"a}che im L{\"o}wenberger Land, n{\"o}rdlich von Berlin. Auf dem die Studierenden sowohl B{\"a}ume pflanzen, als auch deren Wachstum und ihre Effekte auf das Mikroklima und die Ackerkulturen, sowie den Boden beobachten und dokumentieren. Wissenschaftliche Unterst{\"u}tzung erh{\"a}lt das Projekt durch Wissenschaftler:innen der Universit{\"a}t Bonn und dem ZALF e.V., die gemeinsam im „Agrarsysteme der Zukunft-Projekt - DAKIS" (https://adz- dakis.com/ueber-dakis/) daran arbeiten, die Auswirkungen von Agroforstsystemen auf {\"O}kosystemleistungen und Biodiversit{\"a}t zu erfassen und zu bewerten. In den vergangenen 4 Jahren 2017 - 2021 wurden von den Studierenden {\"u}ber 50 Projektberichte erstellt. Diese wurden aufw{\"a}ndig analysiert und mittels vorher definierter Indikatoren klassifiziert. Um weitere R{\"u}ckschl{\"u}sse auf die Qualit{\"a}t der studentischen Lehre ziehen zu k{\"o}nnen, wurde in Umfragen die Meinung und Zufriedenheit der Studierenden als auch der Tutor:innen anonym abgefragt und ausgewertet. Die Daten werden aktuell ausgewertet und die Analyse kann auf der Tagung vorgestellt werden.}, language = {de} } @article{MetzgerCremerBlochetal.2022, author = {Metzger, Lukas and Cremer, Tobias and Bloch, Ralf and Lorenz, Tommy}, title = {Innovative Lehre zur F{\"o}rderung der Agroforstwirtschaf}, series = {B\&B Agrar}, volume = {75}, journal = {B\&B Agrar}, number = {2}, publisher = {Bundesanstalt f{\"u}r Landwirtschaft und Ern{\"a}hrung (BLE)}, issn = {1618-9833}, pages = {18 -- 19}, year = {2022}, abstract = {Die Hochschule f{\"u}r nachhaltige Entwicklung Eberswalde (HNEE) geht neue Wege: Im Zusammenspiel aus Lehre, Forschung und Praxis soll die Agroforstwirtschaft in Deutschland gef{\"o}rdert werden. Ein Reallabor erm{\"o}glicht Studierenden dabei, teamorientiert und partizipativ zu lernen.}, language = {de} } @article{AmponsemBensahAhiekporetal.2022, author = {Amponsem, Bright and Bensah, Edem Cudjoe and Ahiekpor, Julius Cudjoe and Cremer, Tobias and Herold, Nadine and Antwi, Edward and Mensah, Isaac and Narra, Satyanarayana and Boahen, Benjamin}, title = {Cleaner energy potential analysis for composite biomass residues from decentralized sawmills in Ghana- A case study for Oforikrom Municipality}, series = {Cleaner Engineering and Technology}, journal = {Cleaner Engineering and Technology}, number = {11}, publisher = {Elsevier}, issn = {2666-7908}, doi = {10.1016/j.clet.2022.100563}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-6154}, pages = {11}, year = {2022}, abstract = {The variation of wood species processed in sawmills in developing countries generates composite waste which presents treatment challenges due to a lack of understanding of their physicochemical characteristics for proper planning for clean energy generation. Most of the waste is discarded or burnt openly which releases harmful gases into the environment. This study investigated the physicochemical characteristics of mixed sawdust generated from five wood species generated at a Ghanaian sawmill in Oforikrom Municipality for improving waste treatment. The particle size distribution (PSD), bulk density, proximate and ultimate values, thermogravimetric analysis (TGA) and structural analysis were used to characterize the composite sawdust for briquetting and gasification purposes. It was found that the net heating value (17.46 MJ/kg), some proximate and ultimate values meet briquette standard but high percentages of ash (2.95\%), moisture (41.48\%) and the possibility of nitrogen oxides emissions were notable challenges. PSD resulted in different high fine fractions which are unsuitable for densification. The increase of sieving amplitudes at 30, 50 and 80 rpm generated an average increase in sieve efficiency of fines by 4.22\%. Mixing of fines (42.38-46.6\%) and optimum particle size (53.40-57.62\%) fractions was suggested as the best approach to enhance briquette density and durability. The FTIR spectra showed a range of peaks such as 1734.46 cm-1, 1620.48 cm-1, 1506.50 cm-1, 1462.02 cm-1, 1420.32 cm-1 etc. for functional groups identification. Composite sawdust spectra showed high absorbance with no shift of wavenumbers compared with temperate woods, however, it deviated massively when compared with industrial cellulose and organosolv lignin. TGA indicated that exact mixed wood pyrolysis temperatures, volatile and biochar fractions will always depend on sample compositions. The increase in heating rates yielded little significance to volatiles and char increments. Collection of clean sawdust and rooftop drying were recommended as a way of enhancing sawdust properties. Composite sawdust has a promising potential to support Ghana's activities for meeting the renewable energy generation targets. The understanding of these potential assessments is significant to boost the local municipality energy supply.}, language = {en} } @article{LitschelBerendtCremeretal.2022, author = {Litschel, Johannes and Berendt, Ferr{\´e}ol and Cremer, Tobias and Welp, Martin}, title = {Mit regenerativen Materialien zur Brandenburger Bauwende?}, series = {Holz-Zentralblatt}, volume = {148}, journal = {Holz-Zentralblatt}, number = {36}, publisher = {DRW-Verlag Weinbrenner GmbH \& Co. KG}, issn = {0018-3792}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:eb1-opus-6213}, pages = {608 -- 608}, year = {2022}, abstract = {Gemeinsam mit zahlreichen Akteuren aus Berlin und Brandenburg untersucht die Hochschule f{\"u}r nachhaltige Entwicklung Eberswalde (HNEE) in einem breit angelegten Modellvorhaben die Potenziale regenerativer Materialien f{\"u}r die Baubranche.}, language = {de} }