Relevant bibliographies by topics / Limnic environment

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  2. Dissertations / Theses
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Academic literature on the topic 'Limnic environment'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Limnic environment"

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Colin, Jean-Paul, Yvette Tambareau, and Valery A. Krasheninnikov. "An early record of the genus <i>Cytheridella</i> Daday, 1905 (Ostracoda, Limnocytheridae, Timiriaseviinae) from the Upper Cretaceous of Mali, West Africa: palaeobiogeographical and palaeoecological considerations." Journal of Micropalaeontology 16, no. 1 (1997): 91–95. http://dx.doi.org/10.1144/jm.16.1.91.

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Abstract. The limnic ostracod genus Cytheridella Daday, 1905 (Limnocytheridae, Timiriaseviinae), previously only known from Plio–Pleistocene sediments and Recent lacustrine environments of South and Central America, the Caribbean Islands, Florida and Equatorial Africa, and from earliest Eocene to Early Oligocene Eurasian localities, is found for the first time in the Upper Cretaceous (undifferentiated Campanian–Early Maastrichtian) of northern Mali, West Africa, suggesting an African origin for the genus. The association with the brackish-water ostracod genus Sarlatina suggests a mixo- or oligohaline environment for the Cretaceous species of Cytheridella.
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Adhikari, D. P. "Human-induced hydrological changes in Lake Aoki and their influences in limnic environment." Nepal Journal of Environmental Science 1 (December 9, 2013): 1–7. http://dx.doi.org/10.3126/njes.v1i1.36541.

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The hydrological regime of Lake Aoki, central Japan has been altered when electric power plants started draining water to and from the lake since AD 1954. The use of lake water drops its level during winter and early spring and exposes the littoral sediments on the surface. In order to examine how these changes have affected the lake environment, a 23 cm long sediment core from Lake Aoki was investigated for its lithology, sedimentation rate, and total organic carbon (TOC) flux. The sediment below 10 cm was olive black silty clay, and it abruptly changed to grayish olive clayey silt above, corresponding to the timing of the hydrological perturbations (1954). The sedimentation rates were 5 mg cm-2 yr-1 and 85 mg cm-2 yr-1 before and after 1954, respectively, and the TOC content was more than eightfold higher in the post-1954 sediments. The large increase in sedimentation rate was resulted from the combine effects of high sediment load in the artificially added water and immobilization of littoral sediments during lake level lowering in early spring, whereas the elevated TOC flux was attributed to higher biological productivity stimulated by the continuous supply of additional nutrients to the lake via interbasianl mixing of water.
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Song, Xin-shan, Bai-xing Yan, Wei Deng, and Jin-liang Zhai. "Chemical characteristics of water environment in limnic wetlands in the western Songnen Plain, China." Chinese Geographical Science 10, no. 4 (2000): 377–82. http://dx.doi.org/10.1007/s11769-000-0054-1.

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JOKELA-MÄÄTTÄ, MIRKA, TEEMU SMURA, ANNA AALTONEN, PETRI ALA-LAURILA, and KRISTIAN DONNER. "Visual pigments of Baltic Sea fishes of marine and limnic origin." Visual Neuroscience 24, no. 3 (2007): 389–98. http://dx.doi.org/10.1017/s0952523807070459.

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Absorbance spectra of rods and some cones were measured by microspectrophotometry in 22 fish species from the brackish-water of the Baltic Sea, and when applicable, in the same species from the Atlantic Ocean (3 spp.), the Mediterranean Sea (1 sp.), or Finnish fresh-water lakes (9 spp.). The main purpose was to study whether there were differences suggesting spectral adaptation of rod vision to different photic environments during the short history (&lt;104years) of postglacial isolation of the Baltic Sea and the Finnish lakes. Rod absorbance spectra of the Baltic subspecies/populations of herring (Clupea harengus membras), flounder (Platichthys flesus), and sand goby (Pomatoschistus minutus) were all long-wavelength-shifted (9.8, 1.9, and 5.3 nm, respectively, at the wavelength of maximum absorbance, λmax) compared with their truly marine counterparts, consistent with adaptation for improved quantum catch, and improved signal-to-noise ratio of vision in the Baltic light environment. Judged by the shape of the spectra, the chromophore was pure A1 in all these cases; hence the differences indicate evolutionary tuning of the opsin. In no species of fresh-water origin did we find significant opsin-based spectral shifts specific to the Baltic populations, only spectral differences due to varying A1/A2 chromophore ratio in some. For most species, rod λmaxfell within a wavelength range consistent with high signal-to-noise ratio of vision in the spectral conditions prevailing at depths where light becomes scarce in the respective waters. Exceptions were sandeels in the Baltic Sea, which are active only in bright light, and all species in a “brown” lake, where rod λmaxlay far below the theoretically optimal range.
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Schwarz, J., and Th W. Griessemer. "A charophyte flora from the Lower Pechelbronn Formation (?Upper Eocene/?Lower Oligocene) of Malsch south of Heidelberg (SW Germany)." Journal of Micropalaeontology 13, no. 2 (1994): 147–56. http://dx.doi.org/10.1144/jm.13.2.147.

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Abstract. The Lower Pechelbronn Formation (?Upper Eocene/?Lower Oligocene) of Malsch (clay-pit ‘Am Viehweg’) yielded a moderately abundant charophyte assemblage. One new species, Chara rhenana sp. nov., is erected, two more species, Harrisichara lineata and Nitellopsis (Tectochara) cf. wonnacotti, are recorded in the Rhine Graben area for the first time. The Lower Pechelbronn Formation may be correlated to the Stephanochara vectensis zone (Riveline, 1986) and the mammalian level MP 20 (reference locality: St. Capraise; Schmidt-Kittler, 1987). The associated ostracod fauna clearly indicates a limnic depositional environment.
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Dorsey, A. E., and O. C. Kopp. "Distribution of elements and minerals between a coal and its overlying sedimentary rocks in a limnic environment." International Journal of Coal Geology 5, no. 3 (1985): 261–74. http://dx.doi.org/10.1016/0166-5162(85)90028-x.

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Gilfedder, B. S., M. Petri, and H. Biester. "Iodine speciation and cycling in limnic systems: observations from a humic rich headwater lake (Mummelsee)." Biogeosciences Discussions 5, no. 1 (2008): 25–64. http://dx.doi.org/10.5194/bgd-5-25-2008.

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Abstract. Iodine undergoes several redox changes in the natural environment, existing as iodate, iodide, and covalently bound to organic matter. While considerable attention has been given to iodine speciation and cycling in the marine environment, very little is known about iodine cycling and speciation in terrestrial fresh water systems. Here we show iodine speciation (measured by IC-ICP-MS) data from one year of monthly sampling of a small humic rich lake in the Black Forest (Mummelsee) under varying redox conditions. The aim was to elucidate the seasonal cycles of iodine species in the lake water column and to quantify both inorganic and organic iodine species. A sediment core was also collected for iodine analysis. Total iodine levels in the Mummelsee averaged 1.93±0.3 μg l−1. Organo-I was the dominant species in the lake, making up on average 85±7% of the total iodine. No strong seasonal variation in organo-I was observed, with only small variations occurring in the epi- and hypolimnion. Iodide was scavenged from the epilimnion during the summer and autumn, which could be related to (micro)biological uptake and co-precipitation. This was also suggested by the high iodine levels in the sediment core (av. 11.8±1.7 mg kg −1). In the hypolimnion, a strong flux of iodide was observed from the sediments into the water column during anoxic and hypoxic conditions, observed during the summer, autumn and, in the bottom 2 m, the winter. This iodide flux and is thought to occur during decomposition of biological material. Iodate levels in the epilimnion increased consistently over the year, whereas it was reduced below detection limits in the hypolimnion during low oxygen conditions. The winter partial turnover lead to reintroduction of oxygen into the hypolimnion and the formation of iodate and organo-I, as well as removal of iodide. In conclusions, iodine cycling in the Mummelsee was controlled by organo-I, although redox conditions and perhaps biological activity were also important, particularly in the hypolimnion during stratification.
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Sureshkumar, Pandian, and Jibu Thomas. "Strategic growth of limnic green microalgae with phycoremediation potential for enhanced production of biomass and biomolecules for sustainable environment." Environmental Science and Pollution Research 26, no. 34 (2019): 34702–12. http://dx.doi.org/10.1007/s11356-018-4012-9.

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Pickrill, Richard A., Julianne M. Fenner, and Mathew S. McGlone. "Late Quaternary Evolution of a Fjord Environment in Preservation Inlet, New Zealand." Quaternary Research 38, no. 3 (1992): 331–46. http://dx.doi.org/10.1016/0033-5894(92)90042-h.

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AbstractHigh-resolution seismic profiles, as well as sedimentological and micropaleontological analyses of three cores, are used to reconstruct the environmental and sedimentological evolution of Preservation Inlet, the southernmost New Zealand fjord. Toward the end of the last glaciation, a series of deep oligotrophic lakes, impounded by shallow sills, occupied Preservation Inlet. Glaciers filled the headwater valleys and the vegetation consisted of a sparse cover of grass, scrub, and shrubs. The principal rivers discharged into the head of these lakes forming large sandy deltas, while finely laminated clays were deposited in the distal basins. As the climate started warming ca. 18,000 yr B.P., the snowline rose and glaciers retreated. Developing forests were dominated by Metrosideros and Cyathea fringed by coastal shrubland. In the now more productive lakes, a rich freshwater fauna developed, sedimentation rates increased, and organic mud accumulated. Under rapidly rising sea level, between 9500 and ca. 8000 yr B.P., the sills enclosing the lakes were successively overtopped. Marine water intruded into the fjord basins and flooded the deltas at the head of the lakes. By 6500 yr B.P. sea level had stabilized and the fjord assumed its present condition. Shrubs decreased in abundance and forests dominated by Weinmannia and Dacrydium cupressinum then developed. A forest dominated by Nothofagus fusca spread between 2000 and 1500 yr B.P., indicating a cooler climate. In Preservation Inlet and other New Zealand fjords, eustatic sea-level rise has been greater than isostatic rebound or tectonic uplift. Coastal inundation has resulted in a transgressional sequence from a limnic to marine environment. This contrasts with fjord coasts of the northern hemisphere where isostatic rebound has produced coastal emergence, or coastal emergence followed by submergence.
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Antonietto, Lucas Silveira, Silvia Regina Gobbo, Dermeval Aparecido Do Carmo, Mário Luiz Assine, Maria Alice Morgado Castanheira Cordeiro Fernandes, and José Eduardo Lima E. Silva. "Taxonomy, ontogeny and paleoecology of two species ofHarbiniaTSAO, 1959 (Crustacea, Ostracoda) from the Santana Formation, Lower Cretaceous, northeastern Brazil." Journal of Paleontology 86, no. 4 (2012): 659–68. http://dx.doi.org/10.1666/11-012r.1.

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The Araripe Basin is the most extensive interior basin in northeastern Brazil, comprising areas of Ceará, Piauí and Pernambuco states. The Santana Formation, attributed to the Aptian–?lower Albian age of the basin, is subdivided into two members, Crato and Romualdo, which bear an abundant fossil record of plant fragments, arthropods and vertebrates, especially 3D-preserved fishes. The present study focuses on the taxonomy, ontogeny and paleoecology of two ostracode species from the Romualdo Member and the top section of the Crato Member (Ipubi layers),Harbinia salitrensis(Krömmelbein and Weber, 1971) emend. andH. altanew species. The ontogenetic series for both species are illustrated, except for the A-8 instar;H. salitrensisis also redescribed. The present work is also the first to produce quantitative information about the paleoecology of the Santana Formation based on ostracode populations. The results obtained from analyses of the population age-structure of both species, in addition to dominance (Simpson) and diversity index (Shannon) values, corroborated previous data on the studied sequence. According to these results, the strata were deposited in a limnic, low-to-moderate energy environment with salinity levels varying from oligohaline to mesohaline. The new data indicate the possibility of these environments also being hypersaline.
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Dissertations / Theses on the topic "Limnic environment"

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Ferreira-Oliveira, Luis Gustavo [UNESP]. "Conchostráceos permianos da bacia do Paraná: taxonomia, evolução, bioestratigrafia e paleobiogeografia." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/102996.

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Made available in DSpace on 2014-06-11T19:32:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-08-31Bitstream added on 2014-06-13T19:42:53Z : No. of bitstreams: 1 oliveira_lgf_dr_rcla.pdf: 2551069 bytes, checksum: acd81b14b612f8d3d79d2b7529438352 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>O trabalho apresenta uma revisão dos conchostráceos da Formação Rio do Rasto (Bacia do Paraná, Permiano) e discussões substanciadas, em parte, pelos resultados dos experimentos realizados com representantes viventes cultivados em aquários. Concluiu-se que diversas características das carapaças normalmente usadas para a classificação dos conchostráceos fósseis não são diagnósticas para a distinção de táxons porque variam de acordo com fatores tafonômicos, ecológicos e ontogenéticos. Os conchostráceos vivem em águas continentais, são extremamente esteno-halinos e, ao contrário de alguns paradigmas da literatura, não vivem obrigatoriamente em corpos d'água efêmeros, toleram a presença de peixes predadores em seu habitat e duas espécies do mesmo gênero num único corpo d'água. Tais observações coadunam com o registro litológico e paleontológico da parte inferior da Formação Rio do Rasto, depositada em condições lacustres. A parte superior, onde há mais fácies eólicas e evidências de aumento de aridez, apresenta diversidade maior de conchostráceos, incluindo Hemicycloleaia mitchelli, uma espécie que permite realizar correlações cronoestratigráficos com a Austrália e Rússia. Sua idade provavelmente é neotatariana (=wuchiapingiana). Outros táxons, como Monoleiolophus unicostatus, também foram considerados nas correlações, estimando-se que a Formação Rio do Rasto esteja compreendida no Permiano médio-superior.<br>Conchostracans of the Rio do Rasto Formation (Paraná Basin, Permian) are revised and discussions based on experiments with living conchostracans are presented. One conclusion is that many carapace characteristics frequently used for classification change according to taphonomic, ecologic and ontogenetic factors. The conchostracans live in continental fresh waters and, on the contrary of some paradigms of the literature, the organisms are not restricted to ephemeral water bodies and tolerate the presence of predatory fishes and two species of one single genus. These observations combine well with the lithological and paleontological record of the lower Rio do Rasto Formation deposited under lacustrine conditions. The upper part, formed under more arid conditions, presents bigger conchostracan diversity and includes Hemicycloleaia mitchelli. This species may be used for wide correlations with Australia and Russia, and its age probably is Late Tatarian (= Wuchiapingian). Other taxa, as Monoleiolophus unicostatus, were also used for correlations and the age of the formation may be interpreted as mid to late Permian.
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Ferreira-Oliveira, Luis Gustavo. "Conchostráceos permianos da bacia do Paraná : taxonomia, evolução, bioestratigrafia e paleobiogeografia /." Rio Claro : [s.n.], 2007. http://hdl.handle.net/11449/102996.

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Orientador: Rosemarie Rohn Davies<br>Banca: Ana Luisa Brossi Garcia<br>Banca: Fresia Soledad Ricardi Torres Branco<br>Banca: Oscar Rösler<br>Banca: Thomas Rich Fairchild<br>Resumo: O trabalho apresenta uma revisão dos conchostráceos da Formação Rio do Rasto (Bacia do Paraná, Permiano) e discussões substanciadas, em parte, pelos resultados dos experimentos realizados com representantes viventes cultivados em aquários. Concluiu-se que diversas características das carapaças normalmente usadas para a classificação dos conchostráceos fósseis não são diagnósticas para a distinção de táxons porque variam de acordo com fatores tafonômicos, ecológicos e ontogenéticos. Os conchostráceos vivem em águas continentais, são extremamente esteno-halinos e, ao contrário de alguns paradigmas da literatura, não vivem obrigatoriamente em corpos d'água efêmeros, toleram a presença de peixes predadores em seu habitat e duas espécies do mesmo gênero num único corpo d'água. Tais observações coadunam com o registro litológico e paleontológico da parte inferior da Formação Rio do Rasto, depositada em condições lacustres. A parte superior, onde há mais fácies eólicas e evidências de aumento de aridez, apresenta diversidade maior de conchostráceos, incluindo Hemicycloleaia mitchelli, uma espécie que permite realizar correlações cronoestratigráficos com a Austrália e Rússia. Sua idade provavelmente é neotatariana (=wuchiapingiana). Outros táxons, como Monoleiolophus unicostatus, também foram considerados nas correlações, estimando-se que a Formação Rio do Rasto esteja compreendida no Permiano médio-superior.<br>Abstract: Conchostracans of the Rio do Rasto Formation (Paraná Basin, Permian) are revised and discussions based on experiments with living conchostracans are presented. One conclusion is that many carapace characteristics frequently used for classification change according to taphonomic, ecologic and ontogenetic factors. The conchostracans live in continental fresh waters and, on the contrary of some paradigms of the literature, the organisms are not restricted to ephemeral water bodies and tolerate the presence of predatory fishes and two species of one single genus. These observations combine well with the lithological and paleontological record of the lower Rio do Rasto Formation deposited under lacustrine conditions. The upper part, formed under more arid conditions, presents bigger conchostracan diversity and includes Hemicycloleaia mitchelli. This species may be used for wide correlations with Australia and Russia, and its age probably is Late Tatarian (= Wuchiapingian). Other taxa, as Monoleiolophus unicostatus, were also used for correlations and the age of the formation may be interpreted as mid to late Permian.<br>Doutor
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Orhan, Ozguc. "For the end is a limit the question concerning the environment /." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7199.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Government and Politics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Nakashima, Makoto. "Almost sure central limit theorem for branching random walks in random environment." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157736.

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Nyström, Jesper. "Predator-prey interactions of raptors in an arctic environment." Doctoral thesis, Stockholm University, Department of Zoology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-259.

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<p>This thesis concerns the predator-prey interactions of three raptor species in a Swedish arctic community: the gyrfalcon (<i>Falco rusticolus</i>), the rough-legged buzzard (<i>Buteo lagopus</i>) and the golden eagle (<i>Aquila chrysaetos</i>).</p><p>The gyrfalcon behaved like a highly specialised ptarmigan (<i>Lagopus spp.</i>) predator. Gyrfalcon’s functional response to ptarmigan was close to density independent, and ptarmigan remained the dominating prey even in areas with the lowest ptarmigan density. The gyrfalcon did not respond functionally to microtine rodents (i.e. lemmings and voles) and it was clear that the gyrfalcon did not use microtines as an alternative prey category to ptarmigan. As the gyrfalcons did not switch to any alternative prey when ptarmigan was scarce, their reproductive success seemed to be directly dependent on the amount of ptarmigan available in the breeding territories. Of the two ptarmigan species in the study area, rock ptarmigan (<i>L. mutus</i>) dominated gyrfalcon’s diet. Locally, the proportion of rock ptarmigan in gyrfalcons’ diets showed a positive relationship to the expected availability of rock ptarmigan in the breeding territories, indicating a density dependent utilisation. </p><p>The rough-legged buzzard behaved like a highly specialised microtine rodent predator and Norwegian lemming (<i>Lemmus lemmus</i>) was its preferred microtine species. The buzzards showed a type 2 functional response to lemmings. Surprisingly though, they also had a type 3 functional response to grey-sided voles (<i>Clethrionomus rufocanus</i>). We present an optimal diet model where a central place forager, during good food conditions, benefits from partial prey preference, which renders separate functional responses to each prey category. We discuss how the double functional responses of the buzzard affect the population dynamics of sympatric vole species, on both temporal and spatial scales.</p><p>The golden eagle behaved like a generalist predator, and it preyed on all major prey categories in the study area: microtines, ptarmigan, mountain hare, (<i>Lepus timidus</i>) and reindeer (<i>Rangifer tarandus</i>). It seemed to respond functionally to microtine rodent fluctuations with an increased consumption of lemmings during a peak year in the microtine rodent cycle. The golden eagle showed a numerical response to its main prey, the ptarmigan. </p><p>Ptarmigan, microtine rodents and hares seemed to have synchronized population fluctuations in the study area. Such synchronized population fluctuations are believed to be generated by predation. Although the three raptors are the main predators of their community, their predation patterns fail to explain the observed prey population dynamics in the study area. </p>
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Kilian, Kay-Leigh. "What environmental variables limit Typha expansion in Cape Flats wetlands?" Bachelor's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/26384.

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The explosive expansion of Typha capensis into the wetlands of the Cape Flats has resulted in decreased species diversity and habitat value. Several initiatives to control this expansion have had varied success and management of wetlands dominated by T. capensis remains a challenge. For effective rehabilitation, one needs to understand what the problem is and its origin before any action can be taken. This study aims to determine whether there are any factors that limit the expansion of T. capensis that may be used in rehabilitation efforts, with the hypothesis being that the distribution of T. capensis is determined primarily by hydrology, salinity and nutrients such that wetlands with T. capensis or specific T. capensis stands will have stable hydrological regimes, moist soils, low salinities and high nutrients. Six wetlands in Rondevlei with varying dominance of T. capensis, ranging from not having any to being dominated by the plant, were examined. Wetlands were classified into types depending on their dominance of T. capensis, with Typha dominant, Mixed and No Typha wetland types. In each wetland soil cores were taken to represent the main vegetation types, focusing on T. capensis, Ficinia nodosa and Isolepis rubicunda. These three species comprise the dominant species of the three vegetation types that were measured, with T. capensis forming its own group and then rush-like and mat-like vegetation types respectively. Environmental variables like hydrology were observed by field visits at the end of summer and in winter/spring, and the soils were analyzed in the laboratory for salinity, pH and nutrients.
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Wällstedt, Teresia. "Influence of acidification and liming on metals in lake sediments." Doctoral thesis, Stockholm University, Department of Applied Environmental Science (ITM), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-471.

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<p>Emission and precipitation of acidifying substances and metals has caused severe acidification and increased metal concentrations in lakes and streams in Sweden as well as many other countries during the last decades. To counteract the negative effects of acidification, liming has been used extensively in Sweden since the 1970’s, a treatment that has been called one of the largest man-maid manipulations of aquatic ecosystems ever.</p><p>The aim of this thesis is to investigate the influence of acidification and liming on deposition of metals to lake sediments, and to look at the fate of metals in sediments during a possible reacidification process because of terminated liming.</p><p>Studies of both surface sediments and dated sediment profiles sampled from limed lakes and non-limed reference lakes indicated that liming causes increased sedimentation of many metals. Increased deposition to the sediments was found for Al, Cd, Co, Ni, Fe, Mn and Zn, probably as a direct result of the increased pH. Liming was also found to increase the deposition of As and Cr, but that was probably due to the secondary effect of association to Fe and Mn complexes. No influence of lime treatment on the deposition of Hg, Pb and V to lake sediments could be demonstrated. The studies also indicated that acidification can decrease the deposition of Cd, Fe, Mn and possibly also Co and Zn to the sediments.</p><p>The contribution from the used lime products to the metal load in sediments of lakes limed directly on the lake surface was also evaluated. The lime products were found to be an important source for Al, Cu and Ni and a relatively important source for Co, Cr, Hg and V, but did not seem to contribute much to the content of As, Cd, Pb or Zn in lake sediments.</p><p>An experimental study of reacidification showed that (re)mobilisation of metals, e.g Al, Cd, Mn and Zn, from sediments may occur and that reacidification of formerly lime treated lakes may contribute to increased concentrations of these metals in the lake water. Cu, Fe and Pb are less affected by pH changes and the concentrations of these metals will probably not increase in lake water during reacidification.</p><p>Altogether, the thesis shows that lime treatment causes increased deposition of many metals to the lake sediments, whereas reacidification may lead to remobilisation of some metals from the sediments with increased concentrations in the water phase as a result.</p>
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Hoovler, Craig Alan. "Balance Performance Measurment in a Phase Shifted Feedback Environment." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/704.

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Commercial technologies for the objective assessment of balance exist in clinical settings. Training requires integration of sensory information to produce a coordinated motor response related to balance. These systems have had measurable phase delays of up to 250ms in the visual feedback provided to the patient. This provokes an unnatural response, requiring prediction from the subject. The proposed research investigates the impact of visual feedback phase delays on the performance of weight shift tracking tasks in a population of individuals with no known balance deficits.Visual feedback delays were investigated by simulating popular balance training software which utilizes force plates to measure center of pressure and display the results in a stimulus and response study. Ten healthy young-adult subjects with no known balance deficits were recruited to participate in this study. Subjects were asked to stand on a pair of force platforms that were linked to a computer. The system was designed to provide visual feedback corresponding to lateral weight shifts. A computer generated target provided a moving stimulus the subjects attempted to match. The stimulus files presented approximately 20 seconds of movement in a periodic (sinusoidal) or non-periodic pattern. Stimulus frequencies ranged between 0.2 and 1.0 Hz with amplitude sufficient to require the subject to move safely within 50% of his/her base of support. Stimulus presentation was randomized and included both normal (control) and phase delayed (experimental) trials. Results of the experiment point to a noticeable improvement of performance with repeated trials. Regardless of introduced phase delays, study participants improved their performances as they were exposed to more trials, suggesting learning and predictive behavior. Random stimuli produced no noticeable improvements in performance across days of testing, as expected. Visual biofeedback systems may skew performance assessments of balance training because they contain periodic stimuli that are predictable.
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Degwitz, Fernando G. (Fernando Guillermo) 1980. "Numerical upper and lower bound limit analysis for braced excavations." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30131.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.<br>Includes bibliographical references (leaves62-63).<br>This thesis reviews limit theorems and their applications for stability problems in geotechnical engineering. Rigorous numerical solutions of limit analyses can be obtained through finite element discretization of the soil mass and formulation of the limit theorems within a linear programming framework. The current research uses a formulation proposed by Sloan et al. (1988) and extended in a recent Ph.D. thesis by Ukritchon (1998) to include soil-structure interactions. The thesis details the input and output required for numerical limit analysis and presents an example application for the stability of a broad excavation for the MUNI Metro Turnback project in San Francisco. This well documented case study involves a 13 M deep excavation within a deep deposit of May Mud that was supported by an SPTC wall with three levels of cross-lot bracing. The numerical limit analyses calculate factors of safety, FS = 1.03 - 1.36, against basal instability. The factor of safety used in the original design (FS = 1.2) is contained in this range. The results illustrate that numerical limit analysis offers a practical alternative to limit equilibrium methods in evaluating the stability of braced excavations.<br>by Fernando G. Degwitz.<br>M.Eng.
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Ukritchon, Boonchai 1970. "Evaluation of numerical limit analyses by finte elements and linear programming." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11199.

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Books on the topic "Limnic environment"

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Rigola, Miquel. Producción + limpia. Rubes, 1998.

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Triana, Ernesto Sánchez. Eficiencia energética : producción limpia para un desarrollo sustentable. Fundación Friedrich Ebert de Colombia, 1996.

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Weigmann, Diana L. Guidelines for liming acidified streams and rivers. Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1993.

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Rodríguez, Humberto. Portafolio colombiano de proyectos para el mecanismo de desarrollo limpio: -sector energía-. Academia Colombiana de Ciencias Exactas, Físicas y Naturales, 2000.

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Valenzuela, Jorge Roberto Retamal. Incentivos tributarios ambientales: Una vía limpia hacia el desarrollo. Editorial Jurídica La Ley, 2002.

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Tolerance to environmental contaminants. CRC Press, 2011.

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Gloss, Steven. Liming and fisheries management guidelines for acidified lakes in the Adirondack region. The Service, 1989.

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Shanley, James B. Effects of selected forest clearing, fertilization, and liming on the hydrology and water quality of a small tributary to the Quabbin Reservoir, central Massachusetts. U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Heikkinen, Kaisa. Happamoituneiden vesistöjen neutralointi: Kirjallisuuskatsaus. Vesi- ja ympäristöhallitus, 1988.

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Shanley, James B. Effects of selective forest clearing fertilization, and liming on the hydrology and water quality of a small tributary to the Quabbin Reservoir, central Massachusetts. U.S. Geological Survey, 1995.

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Book chapters on the topic "Limnic environment"

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Emons, H., Z. Sebesvari, K. Falk, and M. Krachler. "Occurrence and speciation of arsenic, antimony and tin in specimens used for environmental biomonitoring of limnic ecosystems." In Organic Metal and Metalloid Species in the Environment. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09135-7_4.

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Gilbert, M. E. "Neurotoxicants and Limbic Kindling." In The Vulnerable Brain and Environmental Risks. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3326-9_8.

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Skotnicki, M. L., and P. M. Selkirk. "Plant Biodiversity in an Extreme Environment." In Trends in Antarctic Terrestrial and Limnetic Ecosystems. Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-5277-4_8.

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Derome, John, Mikko Kukkola, Aino Smolander, and Tarja Lehto. "Liming of Forest Soils." In Forest Condition in a Changing Environment. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9373-1_39.

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Hoehler, Tori, Nathaniel A. Losey, Robert P. Gunsalus, and Michael J. McInerney. "Environmental Constraints that Limit Methanogenesis." In Biogenesis of Hydrocarbons. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-53114-4_17-1.

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Hoehler, Tori, Nathaniel A. Losey, Robert P. Gunsalus, and Michael J. McInerney. "Environmental Constraints That Limit Methanogenesis." In Biogenesis of Hydrocarbons. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-78108-2_17.

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Hoehler, T., R. P. Gunsalus, and M. J. McInerney. "Environmental Constraints that Limit Methanogenesis." In Handbook of Hydrocarbon and Lipid Microbiology. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-77587-4_51.

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Gonschorek, Karl-Heinz, and Ralf Vick. "Atmospheric Noise, Electromagnetic Environment and Limit Values." In Electromagnetic Compatibility for Device Design and System Integration. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03290-5_8.

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Zöller, Nikolas. "Entropy Production in Inhomogeneous Thermal Environments." In Optimization of Stochastic Heat Engines in the Underdamped Limit. Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16350-1_5.

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Greinert, H. "Heavy Metal Contamination of Reclaimed Soils as a Consequence of Liming With Ca - Mg Oxides from a Zinc Smelter." In Soil & Environment. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2008-1_136.

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Conference papers on the topic "Limnic environment"

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P., Bartout, and L. Touchart. "The Limnic Footprint Index." In Air and Water Components of the Environment Conference. Casa Cărţii de Ştiinţă, 2018. http://dx.doi.org/10.24193/awc2018_17.

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Liu, Pei-jin, Bin Huang, Bin Yang, and Guo-qiang He. "TDLAS for measurement of temperature in combustion environment." In 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), edited by Stefan Kaierle, Jingru Liu, and Jianlin Cao. SPIE, 2013. http://dx.doi.org/10.1117/12.2011262.

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Hudak, Stephen J., Guadalupe B. Robledo, and Jeffrey Hawk. "Corrosion-Fatigue Performance of High-Strength Riser Steels in Seawater and Sour Brine Environments." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50171.

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Although new high-strength steels have recently been developed to meet the demands of increased reservoir pressures, and sour production fluids, the corrosion-fatigue performance of these new higher-strength materials is largely unknown. The goal of this study was to fill this knowledge gap by generating corrosion-fatigue data in two aggressive environments: 1) a sour production brine, and 2) seawater with cathodic protection. The focus of the current paper is on stress-life (S-N) corrosion-fatigue results in these environments, as well as a baseline air environment. Experiments were performed on five different steels with yield strengths ranging from 848 MPa to 1080 MPa. Prior frequency-scan results based on corrosion-fatigue crack growth rate data demonstrated that not all of these material-environment combinations exhibit a saturation frequency where the detrimental environmental effect approached a constant value as the cyclic loading frequency is decreased. Consequently, S-N tests were performed at different frequencies (0.01 Hz, 0.17 Hz, and 1 Hz), depending on the fatigue life regime, in attempting to match the loading frequencies experienced in service. Corrosion-fatigue occurred at stresses well below the fatigue endurance limit in laboratory air, and cyclic lives in the seawater with cathodic protection environment were found to be 2X to 10X less than those in the baseline air environment, while cyclic lives in the sour brine environment were found to be 30X to 100X less than those in the baseline air environment. In both environments, degradation was greatest at lower stresses in the high cycle fatigue regime. The effect of material strength level had little or no measurable effect on the S-N corrosion-fatigue performance, and the effect of cyclic frequency on the corrosion-fatigue performance was mixed. The S-N response to these two variables differed significantly from recently measured fatigue crack growth kinetics in these same materials that were performed in a companion study. Possible reasons for these differences are discussed.
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Stoyanova, Antoaneta. "ASSESSMENT OF COMPLIANCE WITH THE REGULATORY REQUIREMENTS WHEN BUILDING ENVIRONMENTAL MANAGEMENT SYSTEMS." In THE LAW AND THE BUSINESS IN THE CONTEMPORARY SOCIETY 2020. University publishing house "Science and Economics", University of Economics - Varna, 2020. http://dx.doi.org/10.36997/lbcs2020.85.

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The number of reported alerts with registered environmental incidents raises concerns in government agencies about the safety of the environment. These concerns are the basis for seeking answers as to whether the existing environmental protection requirements are sufficiently comprehensive or adequate. The binding of the state policy on the environment in the sectoral policies is expressed by the observance of the legal obligations for the protection of the environment. Тhe purpose of the present study is to determine in the scope of environmental management systems the methodology for assessment of compliance with regulatory requirements in the management of aspects and subsequent impact on the environment. An expert method related to a logical approach was applied in the research. Regulatory requirements aimed at monitoring the state of the environment are mandatory as requirements for all business operators. They need to provide objective evidence of how aspects of their activities prevent and limit their impact on environmental pollution.
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Skrzypczak, Izabela, and Grzegorz Oleniacz. "Serviceability Limit Verification for Structural Elements of Steel Hall." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.243.

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In recent years, the importance of assessing structural reliability has increased significantly. This is confirmed by the recommendations of the PN-EN 1990 standard. This standard gives the principles and requirements to ensure the safety, serviceability and durability of the structure. It sets out the basis for calculation and verification of the structure and provides guidance to ensure their reliability. Reliability of structure is its ability to meet specific design requirements, taking into account the planned period of use. The planned period of use should be understood as a time period approved in the project, in which the structure or part of it is to be used for their intended purpose, without the need for major repairs. Typically, reliability is expressed by probabilistic measures as indicator of reliability or probability of failure. The aim of this study is to present the results of of roof girder deflection surveying and modeling their reliability. A general algorithm for determining the value of the reliability indicator for the bending steel beam with FORM method will be presented. Verification of the differences between the indicator of reliability obtained by simplified probabilistic methods and compare them with the values recommended in the Eurocode 0 standard will be also shown. For the analyzed steel beam the serviceability limit states were considered.
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Ismail, Hesham, and Balakumar Balachandran. "Vehicle Pose Estimation and SONAR Sensor Based Mapping." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52427.

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In carrying out simultaneous localization and mapping, a mobile vehicle is used to simultaneously estimate its position and build a map of the environment. The long-term goal of this work is to build an autonomous inspection mobile vehicle for oil storage tanks and pipelines. The harsh environmental conditions in storage tanks and pipelines limit the types of feature extraction sensors and vehicle pose estimation sensors that one can use. Here, a SOund Navigation And Ranging (SONAR) sensor will be used for feature extraction, and a gyroscope and an encoder will be used for vehicle pose estimation. The integration of these sensors (SONAR, encoder, and gyroscope) will be discussed in this paper, along with the use of a recently developed algorithm fusion for SONAR sensors. The integration of the sensors represents a step towards implementation of concurrent localization and mapping progress in harsh environments.
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Kang, Sun-yeh, Won-ho Jo, Min-sup Song, Ki-seok Yoon, Taek-sang Choi, and Jun-seog Yang. "An Investigation on the Reduction Schemes of Environmental Fatigue Usage Factor for Pressurizer Surge Line." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-58054.

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For plant life extension, it is the regulatory requirement to assess reactor coolant environmental impacts on critical components of the nuclear power plant including at least those mentioned in NUREG/CR-6260[2]. The pressurizer surge line is the most easy-to-fail component in view of LWR (Light Water Reactor) environments when it comes to meeting the current ASME code limit of the fatigue evaluation. Cumulative Usage Factor (CUF) value could be increased to a maximum of 15.35 times due to the environmental effects, which makes it easy to exceed the allowable fatigue limit (1.0). This paper discusses the process of the environmental correction factor calculation described in NUREG/CR-5704[4], and five proposed schemes for reducing the environmental CUF value to the ASME code limit or below. This paper concludes that the proposed schemes are effective in lowering the environmental CUF value of the pressurizer surge line.
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Manzoor, Sajjad, and Youngjin Choi. "Multi-agent coordination using limit cycles in dynamic environment." In 2016 International Conference on Control, Automation and Information Sciences (ICCAIS). IEEE, 2016. http://dx.doi.org/10.1109/iccais.2016.7822450.

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Lee, Joyoung, and Byungkyu Brian Park. "Evaluation of Variable Speed Limit under Connected Vehicle environment." In 2013 International Conference on Connected Vehicles and Expo (ICCVE). IEEE, 2013. http://dx.doi.org/10.1109/iccve.2013.6799944.

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Srinonchat, J. "Efficient detection of speed limit signs within obscure environment." In IET 3rd International Conference on Wireless, Mobile and Multimedia Networks (ICWMMN 2010). IET, 2010. http://dx.doi.org/10.1049/cp.2010.0678.

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Reports on the topic "Limnic environment"

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Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
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Merk, Christine. Summary report on Workshop 1 laypersons’ perceptions of marine CDR, Deliverable 3.1. OceanNETs, 2021. http://dx.doi.org/10.3289/oceannets_d3.1.

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This deliverable reports about the successful completion of three group discussions on marine carbon dioxide removal (CDR) with laypersons in Germany. The 2-hour group discussions were held online. 5 participants discussed these three topics: (1) the environmental state of the oceans, (2) four selected marine CDR approaches, and (3) responsible research and innovation. The four approaches were ocean fertilization, ocean alkalinization via ocean liming and electrochemical weathering in desalination plants, artificial upwelling, and blue carbon management via kelp forests, mangroves and seagrass meadows.
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Ukkusuri, Satish, Lu Ling, Tho V. Le, and Wenbo Zhang. Performance of Right-Turn Lane Designs at Intersections. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317277.

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Right-turn lane (RTL) crashes are among the most key contributors to intersection crashes in the US. Different right turn lanes based on their design, traffic volume, and location have varying levels of crash risk. Therefore, engineers and researchers have been looking for alternative ways to improve the safety and operations for right-turn traffic. This study investigates the traffic safety performance of the RTL in Indiana state based on multi-sources, including official crash reports, official database, and field study. To understand the RTL crashes' influencing factors, we introduce a random effect negative binomial model and log-linear model to estimate the impact of influencing factors on the crash frequency and severity and adopt the robustness test to verify the reliability of estimations. In addition to the environmental factors, spatial and temporal factors, intersection, and RTL geometric factors, we propose build environment factors such as the RTL geometrics and intersection characteristics to address the endogeneity issues, which is rarely addressed in the accident-related research literature. Last, we develop a case study with the help of the Indiana Department of Transportation (INDOT). The empirical analyses indicate that RTL crash frequency and severity is mainly influenced by turn radius, traffic control, and other intersection related factors such as right-turn type and speed limit, channelized type, and AADT, acceleration lane and AADT. In particular, the effects of these factors are different among counties and right turn lane roadway types.
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Veland, Siri. Summary report on Workshop 2 laypersons’ perceptions of marine CDR, Deliverable 3.2. OceanNETs, 2021. http://dx.doi.org/10.3289/oceannets_d3.2.

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This deliverable reports about the successful completion of three group discussions on marine carbon dioxide removal (CDR) with laypersons in Norway. The 2-hour group discussions were held online. In three groups, and a pilot group, between 2 and 7 participants discussed these three topics: (1) the environmental state of the oceans, (2) four selected marine CDR approaches, and (3) responsible research and innovation. The four approaches were ocean fertilization, ocean alkalinization via ocean liming and electrochemical weathering in desalination plants, artificial upwelling, and blue carbon management via kelp forests, mangroves and seagrass meadows.
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Karam, Sofia, Morteza Nagahi, Vidanelage Dayarathna, Junfeng Ma, Raed Jaradat, and Michael Hamilton. Integrating systems thinking skills with multi-criteria decision-making technology to recruit employee candidates. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41026.

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The emergence of modern complex systems is often exacerbated by a proliferation of information and complication of technologies. Because current complex systems challenges can limit an organization's ability to efficiently handle socio-technical systems, it is essential to provide methods and techniques that count on individuals' systems skills. When selecting future employees, companies must constantly refresh their recruitment methods in order to find capable candidates with the required level of systemic skills who are better fit for their organization's requirements and objectives. The purpose of this study is to use systems thinking skills as a supplemental selection tool when recruiting prospective employees. To the best of our knowledge, there is no prior research that studied the use of systems thinking skills for recruiting purposes. The proposed framework offers an established tool to HRM professionals for assessing and screening of prospective employees of an organization based on their level of systems thinking skills while controlling uncertainties of complex decision-making environment with the fuzzy linguistic approach. This framework works as an expert system to find the most appropriate candidate for the organization to enhance the human capital for the organization.
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Wills, Gabrielle, Janeli Kotzé, and Jesal Kika-Mistry. A Sector Hanging in the Balance: Early Childhood Development and Lockdown in South Africa. Research on Improving Systems of Education (RISE), 2020. http://dx.doi.org/10.35489/bsg-rise-wp_2020/055.

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New evidence suggests that over four months after the closure of early childhood development (ECD) programmes on 18 March 2020, the ECD sector was likely to be operating at less than a quarter of its pre-lockdown levels. Of the 38 percent of respondents from the new NIDS-CRAM survey reporting that children aged 0-6 in their households had attended ECD programmes before the lockdown in March, only 12 percent indicated that children had returned to these programmes by mid-July, well after programmes were allowed to reopen. Using these findings, we estimate that just 13 percent of children aged 0-6 were attending ECD programmes by mid-July to mid-August compared to 47 percent in 2018. The last time that ECD attendance rates were as low as this was in the early 2000s. At this point it is not yet clear what proportion of these declines are only temporary, or whether there will be a lasting impact on ECD enrolment in the country. This dramatic contraction in the ECD sector relates to prohibitive costs to reopening ‘safely’ imposed by the regulatory environment, coupled with shocks to the demand side for ECD programmes (both in terms of reduced household incomes and parent fears of children contracting COVID-19). When viewed from a broader socio-economic lens, the threat of ECD programme closures across the nation will have impacts beyond ECD operators to the lives of millions of children, millions of households and millions of adults who rely on these ECD services. A swift intervention by government is necessary to save this important sector and limit the ripple effect of programme closures on multiple layers of society.
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