Les最新文献

{"title":"Reflections by a member of the Editorial Board","authors":"Kevin T. Smith","doi":"10.26614/les-wood.2021.v70n02a00","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a00","url":null,"abstract":"I thank Co-Editors Ass. Prof. Dr. Jože Kropivšek and Prof. Dr. Katarina Čufar for the opportunity to serve as an Editorial Board member of Les/Wood, an international journal firmly grounded in the broad sweep of Slovene wood science and technology. The Editorial Board works to extend the relevance and impact of Les/Wood within and beyond Slovenia to the international community of wood science and technology in the broadest sense. We see the journal as a tool to support research and development of specific technologies, as well as to develop common terminology. \u0000I would like to use this opportunity to sketch out how I came to be involved with wood science in Slovenia. In retrospect that involvement seems inevitable, but the path was not always clear at the time! After completing my postgraduate education in plant pathology and mycology in the USA in 1982, I accepted my current position as supervisory plant physiologist for the USDA Forest Service, a US federal land management agency with a strong commitment to research & development and to international forestry. \u0000Throughout my career, my personal research has involved tree growth and wood decay in response to injury, infection, and environmental change. These tree responses affect forest health, the economic value of wood for art and industry, the tree-ring record of environmental conditions, and the performance of trees in urban and community environments. \u0000My USDA FS mentor and colleague Dr. Walter Shortle met Prof. Dr. Niko Torelli and Prof. Dr. Katarina Čufar at the IAWA conference in Hamburg (1983) and at the IUFRO World Conference 1996 in Ljubljana, where the two of them were local organizers. Afterwards they obtained a joint Yugoslav American Project, “Possible alterations of wood in air polluted trees”, which defined my earlier collaborations with Professor Torelli and Katarina Čufar on silver fir decline in Slovenia and Europe. Later, Katarina Čufar, Dr. Tom Levanič, and I identified changes in the climatic responses of silver fir in Slovenia and of red spruce in the northeastern US. I also worked with Dr. Primož Oven on special considerations for the health and safety of city trees. Later, Katarina Čufar and I both served on the Executive Council of the Tree Ring Society, an international association for dendrochronological research. We co-taught a tree biology section at the Dendro Fieldweek as part of the World Dendro conference 2010 in Finland. We found that our combination of research experience both intensified and broadened our understanding and presentation of wood structure and function. Since then, we have worked to provide Slovene students and scientists a platform to share techniques and experiences that both extend the science and community of scientists in the international research community. \u0000As an active researcher, I see Les/Wood as noteworthy because of the potential breadth of articles reporting on topics from wood mechanical properties to technologies and industrial ","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47822042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wood analyses helped to determine the location and approximate construction period of the Roman bridge over the Drava River in ancient Poetovio (Ptuj, Slovenia)","authors":"A. Gaspari, K. Čufar, M. Merela","doi":"10.26614/les-wood.2021.v70n02a06","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a06","url":null,"abstract":"We present the results of a dendrochronological study and radiocarbon dating of the wooden piles of the bridge over the Drava River in Ptuj. The piles, together with stone elements (a fragment of an imperial building inscription and parts of the architectural decoration) were retrieved from the riverbed in 1913 and are now in the Regional Museum Ptuj - Ormož. Using dendrochronology, radiocarbon dating of carefully selected annual rings in the wood and calibration with the wiggle-matching method, the date of the last (outermost) annual ring on the pile was determined to be 161 ± 27 cal AD (1σ) or 160 ± 32 cal AD (2σ). Since the pile contained no sapwood, the dating approximately agrees with the date of the building inscription on the stone slab, which attributes the commission for the reconstruction or construction of the bridge to Emperor Hadrian in the last years of his reign (117-138 AD). The dating of the wood has thus confirmed that the remains examined do indeed belong to a Roman bridge, probably built or renovated during the reconstruction of the road network in the area of the colony of Poetovio under Hadrian or one of his successors.","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44167367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Letni sestanek projektne skupine projekta L4-2623: Posvet z naslovom Kaj vemo o ekstraktivih jelove skorje?","authors":"Viljem Vek, Ida Poljanšek, P. Oven","doi":"10.26614/les-wood.2021.v70n02a14","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a14","url":null,"abstract":"","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45210571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interview with Dr. Kavyashree Srinivasa","authors":"K. Čufar","doi":"10.26614/les-wood.2021.v70n02a11","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a11","url":null,"abstract":"","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46047161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Odpornost premazov proti obarvanju zaradi grč v lesu","authors":"Matjaž Pavlič, Jure Vrbec, Jure Žigon, Marko M. Petrić","doi":"10.26614/les-wood.2021.v70n02a04","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a04","url":null,"abstract":"Po premazovanju lesa in izpostavitvi zunanjim klimatskim pogojem in/ali višjim temperaturam lahko namestih, kjer so prisotne grče, pride do obarvanja utrjenega filma, ki ga povzročajo hidrofilni in lipofilni ekstraktivi.Zaradi tega je odpornost premaznega sistema proti obarvanju zaradi grč v lesu zelo pomembna. V naši raziskavi smopreizkusili nekaj osnovnih tipov belo pigmentiranih sistemov. Pri tem smo metodo SIST EN 927-7:2020 ustrezno prilagodilinašim zmogljivostim, jo optimizirali in kritično presodili, ali so kje možne izboljšave standardizirane metode.Rezultati naše raziskave so pokazali, da je odpornost premaznih sistemov proti obarvanju zaradi grč v lesu povezana z vrsto topila v premazih, s prekrivnostjo sistema in njegovo slojnostjo oz. debelino suhega filma. Premazi na osnovi organskih topil so se izkazali za boljše, prav tako tisti, ki so vsebovali več pigmentov, in tisti z večjo debelino suhega filma. Prav tako smo dokazali, da lahko z vrednotenjem barvnih razlik na mestih z grčami in brez njih že pred izpostavitvijo in upoštevanjem te izhodiščne barvne razlike pri vrednotenju razlik po izpostavitvi premazne sisteme veliko bolj objektivno razvrstimo po njihovi učinkovitosti proti obarvanju zaradi grč v lesu. Na podlagi te ugotovitve menimo, da je standardizirano metodo potrebno ustrezno korigirati.","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42067645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uporaba lesno-plastičnih kompozitov v tehnologiji 4D tiska","authors":"Daša Krapež Tomec, Aleš Straže, Matevž Kokot, Manja Kitek Kuzman, Mirko Kariž","doi":"10.26614/les-wood.2021.v70n02a05","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a05","url":null,"abstract":"Tridimenzionalni tisk (3D) z uporabo lesno-plastičnih filamentov je že dobro poznan, vse bolj pa se raziskuje tudi uporaba lesa v štiridimenzionalnem (4D) tisku. 4D tisk je razvijajoče se področje dodajalnih tehnologij, kjer s primerno zasnovo 3D tiskanja in uporabo ustreznih materialov naredimo izdelke, ki ob ustreznih zunanjih sprožilcih spreminjajo obliko in tvorijo dinamične strukture. Pri 4D tisku lahko higroskopnost lesa - običajno pojmovano kot njegovo pomanjkljivost - izkoristimo in zasnujemo izdelke, ki spremenijo obliko glede na spremembo klimatskih pogojev, predvsem vlažnost okolice. \u0000V raziskavi smo s FDM tehnologijo (modeliranje s spajanjem slojev) 3D tiska iz PLA (polimlečna kislina) in lesno-plastičnih filamentov (les-PLA) izdelali preizkušance z različnimi razmerji materialov, pri katerih smo spremljali odziv v spreminjajočih klimatskih pogojih. Za spremljanje spremembe oblike, kot je ukrivljanje, smo izdelali sestavljene preizkušance po principu bimetala (aktuatorje), kjer smo za pasivno plast (ob spremembi vlažnosti okolice ne spreminja svojih dimenzij) uporabili PLA, za aktivno plast (spreminja dimenzije ob spremembi vlažnosti okolice) pa les-PLA v različnih razmerjih debelin ter jih izpostavili laboratorijskim ter zunanjim pogojem. \u0000Rezultati so pokazali, da dodatek lesa pri lesno-plastičnih kompozitih v spreminjajoči se klimi povzroča dimenzijske spremembe in s tem spremembe oblike načrtovanih aktuatorjev. Sprememba oblike je odvisna od razmerja debelin slojev materialov v dvoslojnem aktuatorju, od sorpcije vodne pare ter od vsebnosti lesa v uporabljenem lesno-plastičnem kompozitu.","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46756129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dieter Eckstein, 1939-2021 and his rich legacy of dendrochronology in Slovenia and the world","authors":"K. Čufar","doi":"10.26614/les-wood.2021.v70n02a08","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a08","url":null,"abstract":"Prof. Dr. Dieter Eckstein (1939-2021) was a leading scientist, teacher, mentor, leader, promoter and motivatorin the field of dendrochronology and wood biology. After graduating in wood science and receiving a PhD indendrochronology, he was professor of wood biology at the University of Hamburg. From 1995-2004, he was Director of the Department of Wood Biology, University of Hamburg, and of the Institute of Wood Biology and Wood Protection at the Federal Research Centre for Forestry and Forest Products in Hamburg, Germany. His work had a decisive influence on the development of wood anatomy, wood biology and dendrochronology and his laboratory was a reference point for dendrochronology worldwide. He supported dendrochronologists throughout Europe and around the world in their pioneering work to establish dendrochronology laboratories and develop dendrochronology in numerous countries, including Slovenia.","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47326568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resonančna smrekovina s Pokljuke za izdelavo klasične kitare","authors":"Klemen Novak, Aleš Straže","doi":"10.26614/les-wood.2021.v70n02a13","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a13","url":null,"abstract":"","PeriodicalId":52851,"journal":{"name":"Les","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41552056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interview with Dr. Arnaud Maxime Cheumani Yona","authors":"K. Čufar","doi":"10.26614/les-wood.2021.v70n02a10","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a10","url":null,"abstract":"","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43523679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Z delavnico Zaščita, vgradnja in uporaba lesa na prostem se krepi usposobljenost zaposlenih na področju gradnje z lesom","authors":"Tina Drolc, Miha Humar, Davor Kržišnik, Boštjan Lesar","doi":"10.26614/les-wood.2021.v70n02a12","DOIUrl":"https://doi.org/10.26614/les-wood.2021.v70n02a12","url":null,"abstract":"","PeriodicalId":52851,"journal":{"name":"Les","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43282320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}