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621 - 630 / 2000
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621.
Sanacija gozdov po zaporednih vetrolomih v letu 2023 na Polovniku v gozdnogospodarski enoti Bovec
Nejc Koren, Dragan Marković, 2024, professional article

Abstract: V prispevku so skupaj s potekom sanacije vetrolomov na Polovniku opisani postopek in prizadevanja Krajevne enote Bovec in Območne enote Tolmin Zavoda za gozdove Slovenije za celosten pristop k odpravljanju posledic takih ujm skupaj z Agrarno skupnostjo Čezsoča kot glavnim oškodovancem. Med poletnimi neurji leta 2023 je bilo namreč na hribu Polovnik v severozahodnem delu gozdnogospodarskega območja Tolmin poškodovane več kot 35.000 m 3 lesne mase. Kot odziv na nastalo situacijo je po zajemu podatkov iz zraka in pregleda na terenu Zavod za gozdove Slovenije izdelal sanacijski načrt območja. Določenih je bilo dvanajst glavnih spravilnih polj, dograjen je bil dodaten krak gozdne ceste, sedaj pa na tamkajšnjem zahtevnem terenu poteka predvsem žičniško spravilo lesa. Po končanih delih s spravilom lesa bodo sanacijo nadaljevali z obnovo gozdov, predvsem naravno nasemenitvijo, ponekod s spopolnitvenim sajenjem. Sanacija Polovnika lahko služi kot primer odziva na naravne ujme večjih razsežnosti in razumevanju njihove dinamike pri oblikovanju prilagoditvenih praks upravljanja za prilagajanje gozdov na take režime motenj.
Keywords: vetrolom, naravne motnje, sanacija poškodovanih gozdov, sanacijski načrt, spravilo lesa, Agrarna skupnost Čezsoča, Alpe
Published in DiRROS: 20.09.2024; Views: 302; Downloads: 87
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622.
Naravne motnje na Bovškem – analiza vpliva naravnih motenj in vzrokov za njihovo pojavljanje
Matevž Konjar, Matija Klopčič, 2024, original scientific article

Abstract: V raziskavi smo analizirali strukturo poseka na Bovškem v obdobju 1995–2020 s poudarkom na sanitarnem poseku zaradi vetra in podlubnikov ter poskušali poiskati glavne dejavnike, ki vplivajo na verjetnost pojavljanja vetrolomov in namnožitve podlubnikov. Pridobili smo podatke o količini in strukturi poseka za raziskovalno območje v obdobju 1995–2020 in podatke o šestindvajsetih lokacijah vetrolomov z znanim časom nastanka ter šestindvajsetih odsekih, poškodovanih zaradi podlubnikov. Podatke smo analizirali s pomočjo metod opisne statistike, bivariatne analize in binarne logistične regresije. V raziskovalnem območju smo zaznali izrazito povečanje sanitarnega poseka po letu 2018. Glavna vzroka sanitarnih sečenj sta bila veter in podlubniki. Binarna logistična regresija je kot ključne dejavnike za pojav vetrolomov izpostavila kamnitost in prisotnost minulih motenj ter valovitega reliefa. Bivariatne analize so pokazale tudi, da se vetrolomi pojavljajo predvsem v debeljakih z visoko lesno zalogo, ki rastejo na zmernih do strmih grebenih z južno ekspozicijo, imajo tesen ali vrzelast sklep in večji delež pomlajenih vrzeli. Binarna regresija je izpostavila tudi vpliv močnih jugozahodnih vetrov, ki prinašajo obilne padavine. Za pojav podlubnikov je binarna logistična regresija kot ključne dejavnike izpostavila količino lesne zaloge in delež iglavcev. Bivariatne analize so pokazale tudi, da se podlubniki pogosteje pojavljajo v odsekih z valovitim reliefom in jugovzhodno ekspozicijo, večjim deležem mladovij in sestojev v obnovi ter manjšim deležem drogovnjakov. Analizirali smo tudi trend večanja sanitarnega poseka po koncu proučevanega obdobja 1995–2020.
Keywords: naravne motnje, vetrolom, podlubniki, Alpe
Published in DiRROS: 20.09.2024; Views: 276; Downloads: 79
.pdf Full text (718,84 KB)

623.
Sanacija naravne ujme je priložnost za učenje in priprava na prihodnost
Aleš Poljanec, Boris Rantaša, 2024, preface, editorial, afterword

Keywords: naravne ujme, sanacija požarišč, gozdni požari
Published in DiRROS: 20.09.2024; Views: 270; Downloads: 70
.pdf Full text (39,27 KB)

624.
Commutators greater than a perturbation of the identity
Roman Drnovšek, Marko Kandić, 2025, original scientific article

Abstract: Let $a$ and $b$ be elements of an ordered normed algebra ${\mathcal A}$ with unit $e$. Suppose that the element $a$ is positive and that for some $\varepsilon > 0$ there exists an element $x\in {\mathcal A}$ with $\|x\|\leq \varepsilon$ such that $ab-ba \geq e+x$. If the norm on ${\mathcal A}$ is monotone, then we show $\|a\|\cdot \|b\|\geq \tfrac{1}{2} \ln \tfrac{1}{\varepsilon}$, which can be viewed as an order analog of Popa's quantitative result for commutators of operators on Hilbert spaces. We also give a relevant example of positive operators $A$ and $B$ on the Hilbert lattice $\ell^2$ such that their commutator $A B - B A$ is greater than an arbitrarily small perturbation of the identity operator.
Keywords: Banach lattices, positive operators, commutators, ordered normed algebras
Published in DiRROS: 19.09.2024; Views: 195; Downloads: 117
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625.
Bivariate measure-inducing quasi-copulas
Nik Stopar, 2024, original scientific article

Abstract: It is well known that every bivariate copula induces a positive measure on the Borel $\sigma$-algebra on $[0,1]^2$, but there exist bivariate quasi-copulas that do not induce a signed measure on the same $\sigma$-algebra. In this paper we show that a signed measure induced by a bivariate quasi-copula can always be expressed as an infinite combination of measures induced by copulas. With this we are able to give the first characterization of measure-inducing quasi-copulas in the bivariate setting.
Keywords: quasi-copulas, copula, signed measure, total variation norm, infinite series
Published in DiRROS: 19.09.2024; Views: 219; Downloads: 113
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626.
Cubic factor-invariant graphs of cycle quotient type—the alternating case
Brian Alspach, Primož Šparl, 2024, original scientific article

Abstract: We investigate connected cubic vertex-transitive graphs whose edge sets admit a partition into a $2$-factor ${\mathcal C}$ and a $1$-factor that is invariant under a vertex-transitive subgroup of the automorphism group of the graph and where the quotient graph with respect to ${\mathcal C}$ is a cycle. There are two essentially different types of such cubic graphs. In this paper we focus on the examples of what we call the alternating type. We classify all such examples admitting a vertex-transitive subgroup of the automorphism group of the graph preserving the corresponding $2$-factor and also determine the ones for which the $2$-factor is invariant under the full automorphism group of the graph. In this way we introduce a new infinite family of cubic vertex-transitive graphs that is a natural generalization of the well-known generalized Petersen graphs as well as of the honeycomb toroidal graphs. The family contains an infinite subfamily of arc-regular examples and an infinite subfamily of $2$-arc-regular examples.
Keywords: cubic vertex-transitive graphs
Published in DiRROS: 19.09.2024; Views: 210; Downloads: 112
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627.
Cannabinoids and triple-negative breast cancer treatment
Luka Dobovišek, Simona Borštnar, Nataša Debeljak, Simona Kranjc Brezar, 2024, review article

Abstract: Triple-negative breast cancer (TNBC) accounts for about 10-20% of all breast cancer cases and is associated with an unfavorable prognosis. Until recently, treatment options for TNBC were limited to chemotherapy. A new successful systemic treatment is immunotherapy with immune checkpoint inhibitors, but new tumor-specific biomarkers are needed to improve patient outcomes. Cannabinoids show antitumor activity in most preclinical studies in TNBC models and do not appear to have adverse effects on chemotherapy. Clinical data are needed to evaluate efficacy and safety in humans. Importantly, the endocannabinoid system is linked to the immune system and immunosuppression. Therefore, cannabinoid receptors could be a potential biomarker for immune checkpoint inhibitor therapy or a novel mechanism to reverse resistance to immunotherapy. In this article, we provide an overview of the currently available information on how cannabinoids may influence standard therapy in TNBC.
Keywords: triple-negative breast cancer, breast cancer, cancer treatment, cannabinoids
Published in DiRROS: 18.09.2024; Views: 337; Downloads: 152
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628.
Program spremljanja kakovosti morja in vnosov onesnaženja s kopnega v skladu z Barcelonsko konvencijo : letno poročilo 2010
Valentina Turk, Oliver Bajt, Patricija Mozetič, Mateja Poje, Andreja Ramšak, Milijan Šiško, Alenka Malej, final research report

Abstract: Slovenija kot članica programa Združenih narodov za okolje (UNEP) in podpisnica Konvencije o varovanju Sredozemskega morja pred onesnaženjem (Barcelonska konvencija) aktivno sodeluje v programu Sredozemskega akcijskega načrta (MAP-Mediterranean Action Plan). Program Spremljanja stanja okolja (MED POL program) izvajamo s finančno pomočjo Ministrstva za okolje in prostor R Slovenije, Agencije RS za okolje. Poročilo vključuje rezultate mikrobioloških analiz kakovosti kopaliških vod, fizikalno-kemične in biološke analize morske vode za oceno stopnje evtrofikacije, rezultate policikličnih in aromatskih ogljikovodikov, kadmija in živega srebra v sedimentu in morskih organizmih (školjkah), oceno vnosa s kopenskih točkovnih virov onesnaženja v morje in rezultate analiz biomonitoringa za oceno bioloških posledic onesnaženja na morskih organizmih.
Keywords: varstvo narave, kakovost morja, kontrola kakovosti, morje, onesnaževanje, ekologija morja, biomonitoring, monitoring, evtrofikacijski monitoring, indeks trofičnosti, evtrofizacija, trofični indeks, Tržaški zaliv, Barcelonska konvencija, Jadransko morje
Published in DiRROS: 16.09.2024; Views: 933; Downloads: 559
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629.
Overview on the detection, interpretation and reporting on the presence of unauthorised genetically modified materials : guidance document from the European Network of GMO Laboratories (ENGL)
Arne Holst-Jensen, Yves Bertheau, Theo Alnutt, Dany Morisset, 2011, final research report

Abstract: The ad hoc working group on UGM was established on the basis of a mandate adopted by the ENGL steering committee on January 31st 2007. The working group has been chaired by Arne Holst-Jensen, National Veterinary Institute (NVI), Oslo, Norway, and by Yves Bertheau, Institut National de la Recherche Agronomique (INRA), Versailles, France. The other members of the working group have been: Theo Alnutt, Central Science Laboratory (CSL), UK; Hermann Broll, Federal Institute for Risk Assessment (BfR), Germany; Marc de Loose, Institute for Agricultural and Fisheries Research (ILVO), Belgium; Lutz Grohmann, Federal Office of Consumer Protection and Food Safety (BVL), Germany; Christine Henry, CSL, UK; Lotte Hougs, Danish Plant Directorate (PDir), Denmark; William Moens, JRC, Italy; Dany Morisset, National Institute of Biology (NIB), Slovenia; Jaroslava Ovesna, Research Institute of Crop Production (VURV), Czech Republic; Sven Pecoraro, Bavarian Health and Food Safety Authority (LGL), Germany; Maria Pla, Consejo Superior de Investigaciones Científicas (CSIC), Spain; Theo Prins, RIKILT Institute of Food Safety, Netherlands; Daniel Suter, Swiss Federal Office of Public Health (FOPH), Switzerland; David Zhang, Groupe d'Intérêt Public – Groupe d'Etude et de contrôle des Variétés et des Semences (GIPGEVES), France and Marc Van den Bulcke, European Commission Joint Research Centre (JRC), Italy.
Published in DiRROS: 16.09.2024; Views: 889; Downloads: 1065
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630.
Monitoring populacij izbranih vrst ptic : popisi gnezdilk spomladi 2011 in povzetek popisov v obdobju 2010-2011
Damijan Denac, Katarina Denac, Tomaž Mihelič, Luka Božič, Primož Kmecl, Dejan Bordjan, 2011, final research report

Abstract: V letu 2011 smo izvedli monitoring 17 izbranih vrst ptic na 20 IBA. Identificirali smo naslednje grožnje za ptice na IBA: 1. lov, katerega posledica sta vznemirjanje in nenamerni odstrel (kostanjevka) 2. elektroudar (velika uharica) 3. vznemirjanje na gnezdiščih zaradi rekreacije (velika uharica) 4. intenzifikacija kmetijstva – premena ekstenzivnih travnikov v intenzivne travnike, njive, pašnike; komasacije z odstranjevanjem drevesnih mejic in nekošenih pasov, manjšanje površine visokodebelnih sadovnjakov (zlatovranka, kosec, črnočeli srakoper, hribski škrjanec, veliki skovik itd.) 5. neustrezen vodni režim na gnezdišču (navadna čigra, kostanjevka) 6. uničevanje pomembnih elementov za gnezdenje in prehranjevanje: odstranitev kolonij (navadna čigra), požiganje trstičja in druge obvodne vegetacije (grahasta tukalica, kostanjevka), odstranjevanje grmišč in mejic (črnočeli srakoper, hribski škrjanec, veliki skovik), sekanje primernih gnezditvenih in prehranjevalnih dreves (triprsti in srednji detel) 7. gradbeni in energetski projekti (vrtni strnad) 8. pomlajevanje gozdnih sestojev z neprimernimi ali alohtonimi drevesnimi vrstami (smreka in zeleni bor v Krakovskem gozdu) (srednji detel + ostale kvalifikacijske vrste tega IBA)
Published in DiRROS: 16.09.2024; Views: 861; Downloads: 723
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