211. Nekateri ukrepi za omejevanje širjenja visokega pajesena (Ailanthus altissima (Mill.) Swingle) in smernice za gozdnogojitveno ukrepanje ob vdoru potencialno invazivnih tujerodnih drevesnih vrst v ohranjene gozdove v SlovenijiDušan Roženbergar, Thomas Andrew Nagel, Blaž Urbas, Lena Marion, Robert Brus, 2017, original scientific article Abstract: Visoki pajesen je ena bolj razširjenih tujerodnih drevesnih vrst v Sloveniji. Najpogosteje se razrašča zunaj gozda, včasih pa ga najdemo tudi v gozdnem prostoru. V naših gozdovih je kemično zatiranje prepovedano, zato smo preizkusili tri vrste mehanskega zatiranja te vrste. Najuspešnejša metoda je bila puljenje celotnih osebkov, najmanj pa lomljenje enoletnih poganjkov. Mehansko zatiranje je najučinkovitejše, če ga kombiniramo z drugimi ukrepi, kot so: malopovršinsko pomlajevanje, skrb za polnilno plast, uporaba gozdnogojitvenih sistemov, ki pospešujejo vrstno in strukturno pestrost sestojev ter pospeševanje in sajenje hitrorastočih, rastišču primernih domorodnih vrst.
Keywords: Ailanthus altissima (Mill.) Swingle, tehnike odstranjevanja, visoki pajesen, gojenje gozdov, invazivne tujerodne drevesne vrste, smernice, gospodarjenje z gozdovi
Published in DiRROS: 23.02.2017; Views: 5491; Downloads: 1071
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215. Self-assembled structures composed of single polypeptide comprising at least three coiled-coil forming elements : patentRoman Jerala, Ota Fekonja, Jelka Pohar, Helena Gradišar, Mojca Benčina, Iva Hafner Bratkovič, Robert Bremšak, Špela Miklavič, Urška Jelerčič, Anja Lukan, Tibor Doles, Sabina Božič Abram, Marko Verce, Nika Debeljak, Jožica Friedrich, 2014, patent Keywords: self assembled structures, polipeptide chain, nenostructures
Published in DiRROS: 13.05.2015; Views: 6274; Downloads: 943
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216. Novel complex stacking of fully-ordered transition metal layers in Li [sub] 4 FeSbO [sub] 6 materialsEric McCalla, Bojan Budič, Robert Dominko, 2015, original scientific article Abstract: As part of a broad project to explore Li4MM′O6 materials (with M and M′ being selected from a wide variety of metals) as positive electrode materials for Li-ion batteries, the structures of Li4FeSbO6 materials with both stoichiometric and slightly deficient lithium contents are studied here. For lithium content varying from 3.8 to 4.0, the color changes from yellow to black and extra superstructure peaks are seen in the XRD patterns. These extra peaks appear as satellites around the four superstructure peaks affected by the stacking of the transition metal atoms. Refinements of both XRD and neutron scattering patterns show a nearly perfect ordering of Li, Fe, and Sb in the transition metal layers of all samples, although these refinements must take the stacking faults into account in order to extract information about the structure of the TM layers. The structure of the most lithium rich sample, where the satellite superstructure peaks are seen, was determined with the help of HRTEM, XRD, and neutron scattering. The satellites arise due to a new stacking sequence where not all transition metal layers are identical but instead two slightly different compositions stack in an AABB sequence giving a unit cell that is four times larger than normal for such monoclinic layered materials. The more lithium deficient samples are found to contain metal site vacancies based on elemental analysis and Mössbauer spectroscopy results. The significant changes in physical properties are attributed to the presence of these vacancies. This study illustrates the great importance of carefully determining the final compositions in these materials, as very small differences in compositions may have large impacts on structures and properties.
Keywords: materiali, elektrokemija, spektrografija
Published in DiRROS: 31.03.2015; Views: 4783; Downloads: 806
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