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Relevant bibliographies by topics / Oak Oak Oak Nature Nature Nature

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Academic literature on the topic 'Oak Oak Oak Nature Nature Nature'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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Journal articles on the topic "Oak Oak Oak Nature Nature Nature"

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Larimore, Richard L., Loy R. Phillippe, and John E. Ebinger. "Vascular Flora of Middle Fork Woods Nature Preserve." Illinois Natural History Survey Bulletin 38, no. 1-6 (2008): 177–96. http://dx.doi.org/10.21900/j.inhs.v38.116.

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The vascular flora of Middle Fork Woods Nature Preserve, Vermilion County, Illinois, was studied during the growing seasons of 1999–2002. A total of 376 species were found: 12 ferns, fern-allies, and gymnosperms; 99 monocots; and 265 dicots. The three families with the largest number of species were the Poaceae (44), Asteraceae (39), and Cyperaceae (34, 29 of which were members of the genus Carex). The overstory and woody understory of six forest communities were surveyed: a mature second growth dry-mesic upland forest dominated by Quercus alba (white oak) and Q. velutina (black oak); an old growth, dry-mesic savanna dominated by Q. alba with a dense understory of Acer saccharum (sugar maple); SW-facing and NE-facing forested slopes of a mesic ravine, both dominated by A. saccharum and Q. alba; a southern flatwood forest/ ephemeral pond community dominated by Q. bicolor (swamp white oak); and an immature second growth dry-mesic upland forest dominated by Q. alba and Carya ovata (shagbark hickory). Ground layer plants were surveyed in spring and fall in the dry-mesic upland forest communities, and for each species the relative cover, relative frequency, and importance values were determined. The preserve, comprised mostly of oak-hickory forest communities, was found to be in relatively good ecological condition. Mature and maturing second-growth oaks were present throughout much of the preserve. Sugar maples dominated the understory and, along with the dense overstory, were apparently limiting oak regeneration. The non-natives Lonicera spp. (bush honeysuckles), Elaeagnus umbellata (autumn olive), Alliaria petiolata (garlic mustard), and the native sugar maple, will continue to need to be controlled. Prescribed fire is recommended to limit populations of these species.

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Cedro, Anna. "Tree-Ring Chronologies of Downy Oak (Quercus Pubescens), Pedunculate Oak (Q. Robur) and Sessile Oak (Q. Petraea) in the Bielinek Nature Reserve: Comparison of the Climatic Determinants of Tree-Ring Width." Geochronometria 26, no. -1 (2007): 39–45. http://dx.doi.org/10.2478/v10003-007-0005-2.

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Tree-Ring Chronologies of Downy Oak (Quercus Pubescens), Pedunculate Oak (Q. Robur) and Sessile Oak (Q. Petraea) in the Bielinek Nature Reserve: Comparison of the Climatic Determinants of Tree-Ring WidthIn 2004-2006, 50 trees of downy oak (Quercus pubescens), pedunculate oak (Q. robur) and sessile oak (Q. petraea) were sampled in the Bielinek Nature Reserve. The following chronologies were established from their tree-ring series: OMS of 212 years (1793-2004) for downy oaks well as D10 of 183 years (1817-1999) and D13 of 211 years (1789-1999) for the two indigenous oak species pedunculate and sessile oak, respectively. These chronologies were used for signature years and response function analyses. All three chronologies were highly similar, which points to identical responses to the ambient meteorological conditions. The radial increment of downy oak depends primarily on the amount of precipitation. A high annual sum of precipitation, copious rain in spring-summer in particular, results in wide tree rings. Precipitation in form of rain and snow in winter, too, enhance tree growth by raising the groundwater level and improving the water supply in the habitat during the subsequent spring. Droughts in spring and summer, coupled with high air temperature, result in narrow rings. The tree-ring width/climate relationships at the two indigenous oak species are very similar to those of downy oak. Responses are, however, more distinct and with a higher statistical significance.

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Rohner, Brigitte, Harald Bugmann, Peter Brang, Jan Wunder, and Christof Bigler. "Eichenrückgang in Schweizer Naturwaldreservaten." Schweizerische Zeitschrift fur Forstwesen 164, no. 11 (2013): 328–36. http://dx.doi.org/10.3188/szf.2013.0328.

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Oak decline in Swiss natural forest reserves Knowledge on the natural potential of oaks (Quercus spp.) in Switzerland is important for both nature conservation and adaptation to climate change. To assess this natural potential, we analysed tree ring and inventory data collected in Swiss natural forest reserves. Influences of monthly climate variables on oak growth were determined by response functions, whereas generalized linear mixed-effects models were used to identify the influence of climate and site variables on oak mortality. Oak growth was most strongly limited by summer precipitation. Oak mortality reached values between 0% and 25% per year for the individual inventory period; it decreased with tree diameter and increased with stand basal area and mean precipitation during the inventory period. Because stand basal area has continuously increased since the first inventory, the oak proportion decreased in most reserves. In increasingly dense stands, oaks were outcompeted by more shade-tolerant species such as beech. For the investigated sites, a gain of relative competitiveness of oaks in the course of ongoing climate change was not evident. Regarding the preservation of oak proportions in managed forests, protection measures should therefore still be combined with targeted interventions for reducing the competitive pressure.

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Packard, Steve. "Restoring Oak Ecosystems." Ecological Restoration 11, no. 1 (1993): 5–16. http://dx.doi.org/10.3368/er.11.1.5.

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Hobbs, Tracy, and Truman P. Young. "Growing Valley Oak." Ecological Restoration 19, no. 3 (2001): 165–71. http://dx.doi.org/10.3368/er.19.3.165.

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Rizun, Volodymyr. "Forests carabid beetles (Coleoptera, Carabidae) communities of the «Prypiat-Stokhid» National Nature Park." Proceedings of the State Natural History Museum, no. 36 (December 10, 2020): 171–80. http://dx.doi.org/10.36885/nzdpm.2020.36.171-180.

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Carabid beetles (Coleoptera, Carabidae) communities of the «Prypiat-Stokhid» National Nature Park have been investigated in five types of forest in 2006 with using pitfall Barber traps method. 49 species from 25 genuses were registered. The highest carabid catchability were observed in wet alder and fresh hornbeam-oak forests and the lowest in dry pine and fresh oak-pine forests. Generally 4 carabid species prevailed: Pterostichus oblongopunctatus, Carabus hortensis, Oxypselaphus obscurus, Pterostichus niger. In the dry pine forest prevailed: Syntomus truncatellus, Broscus cephalotes, Harpalus flavescens, Pterostichus strenuus, Calathus erratus, Oodes helopioides. In the fresh oak-pine forest prevailed: Pterostichus oblongopunctatus, Agonum duftschmidi, Carabus violaceus, C. hortensis, Oodes helopioides, Pterostichus minor, P. niger. In the fresh hornbeam-oak forest prevailed: Pterostichus oblongopunctatus, Carabus hortensis, Oxypselaphus obscurus, Pterostichus niger, P. Nigrita. In the wet oak-pine forest prevailed: Pterostichus oblongopunctatus, Oxypselaphus obscurus, Pterostichus niger, Epaphius secalis, Pterostichus rhaeticus, Carabus arcensis, Pterostichus minor. In the wet alder forest prevailed: Pterostichus oblongopunctatus, Carabus hortensis, Oxypselaphus obscurus, Pterostichus niger, P. melanarius.

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Simpson, Thomas B. "Management Techniques to Stimulate Oak Reproduction in Midwestern Oak Savanna Landscapes." Natural Areas Journal 39, no. 4 (2019): 395. http://dx.doi.org/10.3375/043.039.0402.

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Rodriguez-Trejo, D. A., and R. L. Myers. "Using Oak Characteristics to Guide Fire Regime Restoration in Mexican Pine-Oak and Oak Forests." Ecological Restoration 28, no. 3 (2010): 304–23. http://dx.doi.org/10.3368/er.28.3.304.

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Ponomarenko, O. L., and M. V. Shulman. "Influence of seasonal climatic factors on the dynamics of birds interactions with oaks consortia." Ecology and Noospherology 30, no. 2 (2019): 85–94. http://dx.doi.org/10.15421/031915.

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The article is devoted to the bird communities in individual oak consortia (Quercus robur L.) of the linden-ash oak forests. This work material was collected during different seasons of the 2004–2010 years in a linden-ash oak grove on the test plot No. 209 of the ecological profile of the NSC «Bel'gard Prisamar`e International Biospheric stationary», Novomoskovsk district, Dnepropetrovsk region. The individual consortia of 281 examples of three age conditions oak trees (virgins – virg, young generative – gl, mature and old generative individuals – g2–g3) has been investigated. The daily time budget decreases by 2–2,5 times in autumn for all oak ages that have been studied. But the number of consort birds is reduced by 2 times only for virgin and old generative oaks. The young generative oak is attractive enough for birds in autumn. The ratio of the trophic and topical share interactions for all trees ages does not change significantly in autumn. Birds don’t interact with the virgin oak in winter practically. This age oak can’t propose enough food or places for birds’ protection from predators. Oaks in age g1–g3, on the contrary, are in demand by the birds. There 7 birds species on g1 oaks and 13 species on g2–g3 oaks were recorded in winter. The birds’ daily time buds for the one oak example are low in winter, and by the 90 times reduce compared with the summer. The bird time budget basis in winter are the trophic interactions. The birds’ activity on oak sharply increases in spring and exceeds 1,5–2 times the summer parameters on virgin and mature generative oak (g2–g3). Birds on oak spend most of their time on topical interactions during this season because of the oak important role in the birds reproduction. On the other hand, the young generative oak (g1) is not in demand by the birds in spring because of insufficient crown density and the oaks of this age location at the edge. The number of bird species on oak in spring is less than in summer due to the late onset of leaf blooming on the oak. A significant part of the birds’ activity in the spring moves to the lower tier of the forest because of the earlier vegetation beginning. As a result of the research, it was revealed that the consorting groups of common oak throughout the year retain the main features of their organization. The virgin oak is characterized by a stochastic nature of the birds interaction with the consortium core and almost hasn’t obligate consort birds. Young generative oak is actively forming a trophic relations system with consorts due to intensive linear growth. At this age, first of all, general indicators are formed – time and mass budgets. The consortium of mature and old generative oak has a significantly larger number of bird species consorts and their interactions diversity with the tree. This can help to increase the stability of consorting groups. In most cases in the oak consortium the trophic component of the consortium form earlier then the topical. The specific location of the virgin and young generative oak at the lit positions in the lime-ash oak forests influences the oak consortia formation in a considerable scale. The number of types of interactions between the consort and the autotroph is the most effective indicator, which shows a high level of the consortium development. The stability of consortial relations between birds and English oak grows throughout the year from virgin oak to mature and old generative. The virgin oak unstable consorting groups have fluctuations of the species number during the year up to 100 % (the number of consort species in summer was chosen as the initial value). The consortia species composition fluctuations reach 81,82 % for young generative oak, and 59,26 % – for mature and old generative oak. The mature and old generative oak consortia attract seasonal bird species that replace each other throughout the year more actively. This ensures the stability of year-round control of phytophage populations.

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Horodecki, Paweł, Katarzyna Wiczyńska, and Andrzej M. Jagodziński. "Natural regeneration in the ‘Czmoń’ nature reserve (Wielkopolska Region)." Forest Research Papers 75, no. 1 (2014): 61–75. http://dx.doi.org/10.2478/frp-2014-0007.

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Abstract The ‘Czmoń’ nature reserve (23.65 ha) was established in 1998 to protect one of the best-retained areas of natural oak-hornbeam forest (Galio-Carpinetum) in the center of the Wielkopolska Region. Apart from oak-hornbeam forest, the ash-elm riparian forest (Querco-Ulmetum) and alder riparian forest (Fraxino-Alnetum) are found in the reserve. These plant communities, both natural and degenerated as a consequence of previous forest management, have created the convenient conditions for assessment the phytocoenoses’ regeneration potential. The aim of this study was to assess the age and species structure of woody species natural regeneration of the whole area of the nature reserve. To achieve that target, during August and September 2012, 142 sample plots were established with the total area 3550 m2 on which tree and shrub composition and densities were calculated. Woody species regeneration created various diverse communities among individual sub-units, however oak-hornbeam forest species were predominant in the whole regeneration layer. The character of a ‘natural’ forest was retained on a part of the stands. Moreover, regeneration in degenerated parts of the ‘Czmoń’ nature reserve stands is changing according to potential vegetation. Whereas, the establishment of gaps in the Scots pine stands using artificial regeneration was not worthwhile. The natural regeneration structure under the canopy layer of Scots pine stands unambiguously supports the claim that phytocoenoses can regenerate on their own. In spite of the oak regeneration being infrequent, all stands within the ‘Czmoń’ nature reserve retain substantial rejuvenation potential

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Dissertations / Theses on the topic "Oak Oak Oak Nature Nature Nature"

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Maxey, George F. Ferring C. Reid. "Geology as a georegional influence on Quercus Fagaceae distribution in Denton and Coke Counties of central and north central Texas and Choctaw County of southeastern Oklahoma, using GIS as an analytical tool." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5144.

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Maxey, George F. "Geology as a Georegional Influence on Quercus Fagaceae Distribution in Denton and Coke Counties of Central and North Central Texas and Choctaw County of Southeastern Oklahoma, Using GIS as an Analytical Tool." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc5144/.

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This study elucidates the underlying relationships for the distribution of oak landcover on bedrock and soil orders in two counties in Texas and one in Oklahoma. ESRI's ArcGis and ArcMap was used to create surface maps for Denton and Coke Counties, Texas and Choctaw County, Oklahoma. Attribute tables generated in GIS were exported into a spreadsheet software program and frequency tables were created for every formation and soil order in the tri-county research area. The results were both a visual and numeric distribution of oaks in the transition area between the eastern hardwood forests and the Great Plains. Oak distributions are changing on this transition area of the South Central Plains. The sandy Woodbine and Antlers formations traditionally associated with the largest oak distribution are carrying oak coverage of approximately 31-32% in Choctaw and Denton Counties. The calcareous Blackland and Grand Prairies are traditionally associated with treeless grasslands, but are now carrying oak and other tree landcover up to 18.9%. Human intervention, including the establishment of artificial, political and social boundaries, urbanization, farming and fire control have altered the natural distribution of oaks and other landcover of this unique georegion.

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Borelli, Simone 1963. "Natural Regeneration of Oak Woodlands in Southeastern Arizona." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/192036.

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The lack of information on the reproductive dynamics of Western Live Oak formations has created a need for the collection of baseline data. Therefore, a survey of the state of oak regeneration was conducted at several sites in southeastern Arizona. Presence, type, and amount of regeneration were recorded on 108 temporarily-established transects, on seven sites. Parameters examined for their influence on regeneration were aspect, soil, slope, and density. Frequency distributions and chi-square tests were used to analyze the data. Analysis showed that, when the data are pooled, all the parameters have an influence on the presence and distribution of regeneration. On individual study areas, parameters have limited influence or none at all. Further information will have to be gathered before conclusive statements on the dynamics of oak regeneration can be made.

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Neighbour, J. S. "Some aspects of the physiological ecology of the native British oaks." Thesis, Lancaster University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382818.

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Gilljam, David. "Metapopulation persistence of insects living in hollow oaks: effects of adding oaks in the surrounding landscape." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16484.

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<p>The oak district of Östergötland is one of the largest oak forests left in Europe and it harbours many threatened species dependent on old hollow trees. In this study, the saproxylic beetle <em>Osmoderma eremita</em> living in hollow oaks was used as a model species and parameterised for a metapopulation model (the incidence function model) at the level of individual trees. The aim was to set up a number of conservation management scenarios, where new oaks were added to increase the quality of the matrix and then simulate the resulting metapopulation occupancy, using three levels of dispersal. A real data set of hollow oaks was used as the base for modeling. Oaks were added to cells in a lattice covering the study landscape, where cell size, cell position and numbers of oaks per hectare were varied. The results show that a larger area of added oaks and a greater number of oaks per hectare will give a higher increase in total occupancy, no matter the dispersal, but the second smallest cell size used (3.4 km2 ) will give the highest response per effort for medium and high dispersal abilities, and smaller cells with greater number of oaks per area can be more effective. The spatial position of the increase in occupancy differs depending on dispersal ability of the focal species and should be considered in conservation management work. For unoccupied cells, the effort required to get the cell occupied will be smaller for cells having a greater number of oaks.</p>

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Barrocas, Eva de Gouveia. "Contribution to the study of holm oak stand dynamics." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/30090.

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The holm oak is an emblematic species of the montado, a complex and biodiverse multifunctional, agro-silvopastoral system. Signs of the decline of the montado crown cover have been reported. This research followed an integrative approach to investigate how crown cover influences stand structure, natural regeneration, soil conditions, and litter layer in pure holm oak stands. Two new methodologies were created: STRUX Index that facilitates structure classification, and Natural Regeneration Classification that studies the viability of natural regeneration. The results showed that a higher crown cover was linked to uneven-aged structure, higher values of above-ground biomass, higher number of established natural regeneration, and a tendency for higher values of soil organic carbon and litter layer. Furthermore, it was observed a positive correlation between natural regeneration, litter layer, and soil organic carbon together with a negative correlation with soil pH This study brings a positive perspective on the preservation of holm oak stands; Contribuição para a dinâmica de povoamento em montado de azinho A azinheira é uma espécie emblemática do montado, sistema agro-silvopastoril, multifuncional e de elevada biodiversidade. Como a área de montado regrediu nas últimas décadas, tornou-se urgente compreender a dinâmica dos montados de azinho. Através de uma abordagem integrada, foi estudada a contribuição do grau de coberto para a dinâmica da estrutura dos povoamentos. Duas novas metodologias foram criadas: o Índice STRUX, para a classificação da estrutura do povoamento, e a Classificação de Regeneração Natural, para avaliar a viabilidade e qualidade da regeneração natural. Os resultados indicaram que valores superiores de grau de coberto estão relacionados com a estrutura irregular, com mais biomassa florestal e com mais regeneração natural instalada. Foi observada uma correlação positiva entre a regeneração natural, a manta morta e o carbono orgânico e uma correlação negativa com o pH do solo. Este estudo contribuiu para uma perspetiva positiva sobre a resiliência do montado de azinho.

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Taylor, Troy Sherwood Loewenstein Edward F. "Exploring natural and artificial regeneration techniques for developing high-quality bottomland oak stands." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Thesis/TAYLOR_TROY_7.pdf.

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Guiher, Sara Nicole. "A Regional Management Strategy for Invasive Plants in the Oak Openings." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1503607896706064.

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Black, Devin E. "MANAGING UPLAND OAK FORESTS WITH DISTURBANCE AND THE IMPLICATIONS FOR NON-NATIVE SPECIES INVASIONS." UKnowledge, 2017. http://uknowledge.uky.edu/forestry_etds/32.

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Natural and anthropogenic disturbances have influenced forest stand structure and affected species compositions within forests for millennia. Disturbances such as fire, severe weather events, and forest management practices may result in significantly reduced tree biomass. Thus, these disturbances may lower canopy closure and stem density in support of forest management goals, such as open oak woodland restoration, or promote an increase in species richness within the forest understory. However, these types of disturbance may also produce the unwanted consequence of opening pathways for the invasion of non-native species. Once established, these non-native species may threaten native plant communities and biodiversity. Here, we elucidate how varied natural and anthropogenic disturbances have altered forest stand structure. One consequence of disturbance has been the increase in the presence and cover of non-native species within upland oak forest sites located in the Daniel Boone National Forest, Kentucky. The results of these studies suggest that timely and effective management strategies are needed to minimize non-native species impact on forested habitats following disturbance, and to promote the desired structural shifts that will sustain diverse habitats and support biodiversity.

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Forrester, Guy J. "The population ecology of acorn weevils and their influence on natural regeneration of oak." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46774.

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Books on the topic "Oak Oak Oak Nature Nature Nature"

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Coats, Laura Jane. The oak tree. Macmillan Pub. Co., 1987.

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The oak tree. Macmillan Pub. Co., 1987.

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Browning, L. M. Oak wise: Poetry exploring an ecological faith. Little Red Tree Pub., 2010.

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Trautman, Baxter. Spirit of the valley: An ecological mythology of an oak savanna. Black Mountain Press, 1998.

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Oak wise: Poetry exploring an ecological faith. Little Red Tree Pub., 2010.

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Harris, Esmond. Oak: A British history. Windgather Press, 2003.

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Anderson, Katharine. Nature, culture, and big old trees: Live oaks and ceibas in the landscapes of Louisiana and Guatemala. University of Texas Press, 2004.

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Anderson, Katharine. Nature, culture, and big old trees: Tales of live oaks and ceibas in the landscapes of Louisiana and Guatemala. University of Texas Press, 2003.

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Reichel, Werner. Der Baum: Ein Gipfel der Natur : Gesichter einer Eiche. Olms, 1999.

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Aitchison, Stewart W. A guide to exploring Oak Creek and the Sedona area. RNM Press, 1989.

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Book chapters on the topic "Oak Oak Oak Nature Nature Nature"

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Rabaça, João E., Luísa Catarino, Pedro Pereira, António Luís, and Carlos Godinho. "Case Study 2. Birds as Indicators of HNV: Case Study in Portuguese Cork Oak Montados." In Birds as Useful Indicators of High Nature Value Farmlands. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50284-7_6.

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Radoglou, K. "Photosynthesis of Oak Species Under Natural Drought." In Progress in Botanical Research. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5274-7_84.

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Johnson, P. S., S. R. Shifley, R. Rogers, D. C. Dey, and J. M. Kabrick. "Development of natural stands." In The ecology and silviculture of oaks. CABI, 2019. http://dx.doi.org/10.1079/9781780647081.0195.

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Oak, Steven W., Martin A. Spetich, and Randall S. Morin. "Oak Decline in Central Hardwood Forests: Frequency, Spatial Extent, and Scale." In Natural Disturbances and Historic Range of Variation. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21527-3_3.

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Oliveira, G., O. A. Correia, M. A. Martins-Loução, and F. M. Catarino. "Growth Patterns of Cork-Oak (Quercus Suber L.) under Natural Conditions." In Responses of Forest Ecosystems to Environmental Changes. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2866-7_195.

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Oliveira, G., O. A. Correia, M. A. Martins-Loução, and F. M. Catarino. "Water relations of cork-oak (Quercus suber L.) under natural conditions." In Quercus ilex L. ecosystems: function, dynamics and management. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-2836-2_21.

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Mopper, Susan. "Local Adaptation and Stochastic Events in an Oak Leaf-Miner Population." In Genetic Structure and Local Adaptation in Natural Insect Populations. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-0902-5_7.

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Scutareanu, P., and R. Lingeman. "Natural defence of pedunculate oak (Quercus robur) against the defoliating insect Euproctis chrysorrhoea." In Proceedings of the 8th International Symposium on Insect-Plant Relationships. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1654-1_22.

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Garkoti, Satish Chandra. "Regeneration of White Oak (Quercus leucotrichophora) in Two Pine Invaded Forests in Indian Central Himalaya." In Management of Natural Resources in a Changing Environment. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12559-6_15.

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Pemán, Jesús, Esteban Chirino, Josep María Espelta, et al. "Physiological Keys for Natural and Artificial Regeneration of Oaks." In Tree Physiology. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69099-5_14.

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Conference papers on the topic "Oak Oak Oak Nature Nature Nature"

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Alexandrova, Anastasia M. "DYNAMICS OF TEMPERATURE AND SOIL FREEZING IN OAK FORESTS OF THE “BASTAK” NATURE RESERVE." In Климатические изменения и сезонная динамика ландшафтов. [б.и.], 2021. http://dx.doi.org/10.26170/kfg-2021-01.

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Tinya, Flóra, Bence Kovács, and Peter Odor. "Towards a more nature-based silviculture: effects of experimental forestry treatments on forest regeneration in an oak-hornbeam stand." In 5th European Congress of Conservation Biology. Jyvaskyla University Open Science Centre, 2018. http://dx.doi.org/10.17011/conference/eccb2018/107504.

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Aramayo, Gustavo A., Douglas J. Ammerman, and Jeffrey A. Smith. "Response of a Dry Storage Spent Fuel Cask to Hypothetical Loading." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71218.

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This paper addresses the analytical methods used to determine the response of a dry storage spent fuel cask to hypothetical loading. Because of the sensitive nature of the topic under discussion, the response of the cask is described in qualitative terms, and the paper is intentionally vague on the parameters and results. This research was sponsored by the U.S. Nuclear Regulatory Commission (NRC) Spent Fuel Project Office. The work was performed under contract from the Sandia National Laboratory (SNL), Transportation Risk and Packing organization. The analytical effort was performed at the Oak Ridge National Laboratory (ORNL) facilities with loading specified by SNL.

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Nedealcov, Maria, Ala Donica, and Nicolae Grigoras. "Evaluări privind impactul secetei asupra speciilor de stejari (Quercus Robur, Q. Petraea, Q.Pubescens) în condiții de aridizare a climei." In Starea actuală a componentelor de mediu. Institute of Ecology and Geography, Republic of Moldova, 2019. http://dx.doi.org/10.53380/9789975315593.27.

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The growth and survival of forests in the future, especially in the peripheral and transition areas of ecosystems, such as the Moldavian oak forests, depend directly on temperature changes and the amount of atmospheric precipitation. The purpose of this paper is to determine the potential impact of climate aridization on native species - oaks (Quercus robur, Q. petraea, Q.pubescens) in correlation with ecological niche for these species and identifying the vulnerability zones of forests versus the drought (reproduced by various values of the DeMartonne Index). It has been determined that mesophilic oak specie, during the vegetation period, in the central and southern part of the country, under more dry, more arid conditions of development, will feel changes in the sensitivity to water scarcity, changes in the compositional structure of the respective ecosystems and chorological displacements of the species (limiting the growth area of the Quercus robur, Q. petraea and advancing of Q.pubescens to the central part of country).

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Nanstad, Randy K., Mikhail A. Sokolov, and Philip J. Maziasz. "Microstructural Banding and Biaxial Fracture Toughness Tests in a Specially Heat-Treated Reactor Pressure Vessel Steel." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-3058.

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The Heavy-Section Steel Technology (HSST) Program at Oak Ridge National Laboratory (ORNL) includes a task to investigate the effects of constraint on the cleavage initiation fracture toughness of reactor pressure vessel (RPV) steels in the lower transition temperature region using relatively large cruciform fracture toughness specimens under varying degrees of biaxial loading. One of the materials used for the project was a plate of A533 grade B steel (HSST Plate 14A) which was specially heat treated to result in a yield strength comparable to that of a radiation-sensitive RPV steel near the end of design life. During the testing phase to characterize the fracture toughness behavior of the plate with uniaxial three-point bend specimens, some relatively low fracture toughness values were observed. Subsequent metallography revealed the presence of varying degrees of dark bands in the microstructure. These observations prompted an investigation of the relationship between the experimentally determined fracture toughness results and the microstructure of the plate steel used for the biaxial-loading effects project, especially with regard to the results obtained from the biaxial test specimens. The primary issue in the investigation is whether the fracture toughness results obtained from the biaxially loaded specimens were influenced by the steel microstructure in a biased manner, i.e., were the observation regarding effects of biaxial loading on fracture toughness significantly affected by the microstructural segregation in heat treated HSST Plate 14A. A secondary issue is whether segregated microstructures are common in steels used for RPV construction and if the current procedures for evaluating fracture toughness of RPV steels adequately account for such microstructures. Various metallurgical tools, including metallography, microhardness testing, scanning electron fractography, electron microprobe analysis, and analytical electron microscopy were used to characterize the nature of the bands and evaluate the potential effects on the fracture toughness results.

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Lee, Hwa-Seon, Won-Woo Seo, and Kyu-Sung Lee. "Detection of Oak Wilt Disease Using Convolutional Neural Network From Uav Natural Color Imagery." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8900411.

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Rumiantsev, Maksym. "OAK FORESTS OF THE LEFT-BANK FOREST-STEPPE ZONE OF UKRAINE AND THEIR NATURAL REGENERATION." In Modern Global Trends in the Development of Innovative Scientific Researches. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-588-39-6-34.

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Petrykowski, John C. "Analysis of Fuel-Coolant Interaction Potential in Sodium Cooled Fast Reactor Safety Experiments." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54925.

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Improved utilization of nuclear fuels, burning of actinides and advancements in safety have brought about renewed interest in sodium cooled fast reactor technology. In regards to this and in light of recent events which have focused attention on new concerns involving safety, analyses have recently been performed addressing beyond design basis accident conditions for which the existence of large quantities of vaporized fuel and coolant have been postulated. Specifically, for very low probability, but highly energetic core disruptive accidents in sodium cooled fast reactors, molten and vaporized fuel in contact with coolant can bring about a fuel coolant interaction leading to transformation of a significant inventory of coolant from liquid to vaporforme, with a potential for subsequent release of fuel as aerosol from the reactor vessel due to transport of fuel fragments and fuel aerosol by the vaporized fuel and coolant. Because general statements concerning the nature of these events were largely speculative, out-of-reactor experiments were conducted in the mid 1980’s in the FAST-CRI-III facility at Oak Ridge National Laboratory to study the transport in sodium of aerosol-bearing UO2 vapor bubbles. Although codes featuring detailed multi-physics models [1] were in various stages of development at the time of program cessation, a simplified thermo-mechanical model, free of requirements for detailed thermophysical property data, has recently been developed for purposes of evaluating FAST outcomes. The model consists of a hydrodynamic module which is used to predict the movement of a pulsatile, aerosol-bearing vapor bubble through the surrounding coolant and a heat transfer module which accounts for thermal interactions as the bubble thermally radiates to the surrounding coolant. The model predictions are consistent with key experimental trends, namely: (1) significantly reduced aerosol release as the coolant level increased, (2) greatly reduced aerosol release in sodium tests compared to release levels measured in a series of baseline water tests. The consistency of these trends is discussed in terms of thermo-mechanical characteristics of the respective coolants. Specifically, the inertia of the surrounding coolant impedes bubble transport to the free surface which addresses the first point above, and, relative to the second point, bubble lifetimes are sufficiently short relative to time estimates for transit to the free-surface, due principally to the effectiveness of quenching by radiation which is particularly pronounced in the case of sodium, owing to high reflectivity values. Additionally, pool subcooling was found to have a cross-cutting influence on aerosol release. Only in tests in which pool subcooling was reduced to ∼10 Kelvin was significant aerosol release detected. For those tests, which occurred in water, measurements suggest that coolant vaporization occurred at intensities above 3000 kg/m2-s, well beyond what has generally been reported from fuel coolant interaction studies in which the coolant interactions are with molten fuel forms. This set of findings will permit a more general assessment of the implications of fuel coolant interactions on the progression of core disruptive accidents, particularly with regards to assessing probable modes of in-vessel aerosol transport within sodium cooled reactors.

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Díaz-Maroto, Ignacio J., and Pablo Vila-Lameiro. "Pedunculate or common oak (Quercus robur L.) silviculture in natural stands of Galicia (NW Spain): environmental restrictions." In Secondo Congresso Internazionale di Selvicoltura = Second International Congress of Silviculture. Accademia Italiana di Scienze Forestali, 2015. http://dx.doi.org/10.4129/2cis-dm-ped.

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Butterman, Heidi C., and Marco J. Castaldi. "CO2 Enhanced Steam Gasification of Biomass Fuels." In 16th Annual North American Waste-to-Energy Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/nawtec16-1949.

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The current study involves an experimental investigation of the decomposition of various biomass feedstocks and their conversion to gaseous fuels such as hydrogen. The steam gasification process resulted in higher levels of H2 and CO for various CO2 input ratios. With increasing rates of CO2 introduced into the feed stream, enhanced char conversion and increased CO levels were observed. While CH4 evolution was present throughout the gasification process at consistently low concentrations, H2 evolution was at significantly higher levels though it was detected only at elevated gasification temperatures: above 500°C for the herbaceous and non-wood samples and above 650°C for the wood biomass fuels studied. The biomass feedstocks were studied through the use of Thermo Gravimetric Analysis (TGA), Gas Chromatography, Calorimetry, Atomic Absorption Spectrophotometry (AAS), and the Scanning Electron Microscope with Energy Dispersive X-Ray Analysis (SEM/EDX). The chemical composition of the various biomass fuels and their combustion and gasification ash residues, in addition to the mass decay and gaseous evolution behavior were investigated as a function of temperature. The thermal treatment of biomass fuels involves pyrolysis and gasification with combustion occurring at the higher temperatures. In the gasification environment, when combustion processes are occurring, gaseous components evolve from the fuel and react with oxygen either released from the biomass structure itself, or from the injected steam and CO2. These high temperature reactions are responsible for the enhanced burnout of the carbon (charcoal) structure that is produced during the low temperature pyrolytic breakdown of the biomass. Since the ligno-cellulosic biomass component typically found in U.S. MSW is greater than 50%, techniques to enhance the thermal treatment of biomass feedstocks can also aid in the processing of MSW. Gas evolution as a function of temperature was monitored for H2, CH4, CO2 and CO for several biomass fuels that included woods, grasses and other ligno-cellulosic samples. These included oak, sugar maple, poplar, spruce, white pine, Douglas fir, alfalfa, cordgrass, beachgrass, maple bark, pine needles, blue noble fir needles, pecan shells, almond shells, walnut shells, wheat straw, and green olive pit. The TGA mass decay curves showed similar behavior for the woods, grasses and agricultural residues, where most of the mass loss occurred before 500°C. Most feedstocks exhibited 2 constant mass steps though several exhibited a third with completed mass loss by 900°–1000°C. Two distinct mass decay regimes were found to correlate well with two distinct gas evolution regimes exhibited in the curves for CO, H2 and CH4. Most of the mass loss occurred during pyrolysis, with the remaining degradation to ash or char occurring in the high temperature gasification regime. One characteristic of biomass samples is the highly variable nature of the mineral composition. SEM/EDX analyses indicated high levels of potassium, magnesium and phosphorus in the ash residue. The devitrification and embrittlement of the quartz furnace and balance rods were attributed to the high mineral content of many of the biomass feedstocks, with the high alkaline oxide levels of the grasses being particularly destructive. While mineral content may exert a beneficial effect through enhanced char reactivity with the possibility for a more thorough processing of the feedstock, the potential for corrosion and slagging would necessitate the judicious selection and possible pretreatment of biomass fuels. A major advantage of thermal treatment through gasification prior to combustion is the ability to remove many of the corrosive volatiles and ash elements such as potassium, sodium and chlorine to avert damage to the process equipment.

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Reports on the topic "Oak Oak Oak Nature Nature Nature"

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Devine, Warren D., and Constance A. Harrington. Planting native oak in the Pacific Northwest. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2010. http://dx.doi.org/10.2737/pnw-gtr-804.

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Parr, P. D., and J. F. Hughes. Oak Ridge Reservation Physical Characteristics and Natural Resources. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/921773.

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Baranski, Micahel J. Natural Areas Analysis and Evaluation: Oak Ridge Reservation. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/1023815.

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Baranski, Dr Michael J. Aquatic Natural Areas Analysis and Evaluation: Oak Ridge Reservation. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1023838.

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Ryon, Michael G., Patricia Dreyer Parr, and Kari Cohen. Native Grass Community Management Plan for the Oak Ridge Reservation. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/930916.

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Carter, Evin, Greg Byrd, Kitty McCracken, et al. Natural Resources Assessment for the SNS Second Target Station, Oak Ridge, Tennessee. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1669759.

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Watson, David, Philip Jardine, Baohua Gu, et al. Natural and Accelerated Bioremediation Research (NABIR) Field Research Center (FRC), Oak Ridge Tennessee. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/896093.

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Peterson, Mark J., Jamie M. Herold, Kitty K. McCracken, et al. Natural Resource Assessment for the Proposed Environmental Management Disposal Facility (EMDF), Oak Ridge, Tennessee. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1474601.

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Pounds, L. R., P. D. Parr, and M. G. Ryon. Resource management plan for the Oak Ridge Reservation. Volume 30, Oak Ridge National Environmental Research Park natural areas and reference areas--Oak Ridge Reservation environmentally sensitive sites containing special plants, animals, and communities. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10179639.

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Ottmar, Roger D., Robert E. Vihnanek, Clinton S. Wright, and Geoffrey B. Seymour. Stereo photo series for quantifying natural fuels Volume IX: oak/juniper in southern Arizona and New Mexico. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2007. http://dx.doi.org/10.2737/pnw-gtr-714.

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