Global ETD Search

11	KOREAN ANTHRACITE COAL CLEANING BY MEANS OF DRY AND WET BASED SEPARATION TECHNOLOGIES Mahmoodabadi, Majid 01 January 2015 (has links) Korean coals are typically high rank anthracite characterized by high ash content and difficult cleaning characteristics. The main objective of the study was to evaluate the feasibility of treating various size fractions within the coal using an assortment of physical coal cleaning technologies. Dry cleaning is preferred due to the friability of the coal. As such, three pneumatic processes were tested including Ore Sorting for the plus 10 mm material, Air Table Separation for 10 x 1 mm fraction and Tribo-electric Separator for - 1 mm fraction. The Dense Medium Cyclone is known to be one of the most efficient separation processes and thus was evaluated for the cleaning of 10 x 1 mm coal. To realize the optimum performances from the Air Table and Rotary Tribo-electric Separator, their operational variables were systematically studied using a parametric experimental design. In addition, the dense medium cyclone and X-ray Transmission Sorting trials were performed under various medium densities and separation settings, respectively. A comparison of the cleaning performance revealed that the Dense Medium Cyclone and X-ray Transmission Sorting proved to provide the most effective results with maximum ash rejection and combustible recovery. The tribo-electric separation process was ineffective while the air table provided modest ash reduction potential. XRT Tribo Anthracite dense medium cyclone pneumatic riffle table X-ray transmission sorter Rotary tribo-electric separator Coal cleaning Mining Engineering
12	Benthic Community Structure Response to Flow Dynamics in Tropical Island and Temperate Continental Streams Gorbach, Kathleen R. January 2012 (has links) No description available. Biology water diversion riffle habitat cascade habitat run habitat neritid snail migration native Hawaiian aquatic species introduced Hawaiian aquatic species stream flow dynamics
13	Scale-Dependent Environmental Influences on Linked Mussel-Fish Assemblages in Big Darby Creek, OH Bey, Clarissa Rachel January 2013 (has links) No description available. Ecology Wildlife Conservation
14	PARTICULATE ORGANIC MATTER DYNAMICS IN THE DOWNSTREAM OF DAM RESERVOIRS: ROLES OF CHANNEL GEOMORPHOLOGY AND RESPONSES OF BENTHOS COMMUNITIES / 貯水ダム下流域における粒状有機物動態 : 河床地形の役割と底生動物群集の応答 OCK, Giyoung 23 March 2010 (has links) Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第15315号 / 工博第3194号 / 新制\|\|工\|\|1481(附属図書館) / 27793 / 京都大学大学院工学研究科都市環境工学専攻 / (主査)教授角哲也, 准教授竹門康弘, 准教授武藤裕則 / 学位規則第4条第1項該当 Particulate organic matter POM dynamics channel geomorphology dam impacts retention efficiency lentic plankton stable isotope mixing model riffle and pool pine pollen freshwater golden mussel sediment replenishment sediment management Uji River Nunome River 500
15	Environmental Impact from Outdoor/Environmental Education Programs: Effects of Frequent Stream Classes on Aquatic Macroinvertebrates Bossley, Jon P. 14 September 2016 (has links) No description available. Aquatic Sciences Environmental Education Environmental Science Entomology environmental education outdoor education resident outdoor education anthropogenic disturbance BACI design Tbilisi Declaration natura doctrina macroinvertebrates clingers sprawlers riffle Alum Creek pulse disturbance press disturbance
16	Population biology and fish hosts of several federally endangered freshwater mussels (Bivalvia: Unionidae) of the upper Tennessee River drainage, Virginia and Tennessee Watson, Brian T. 22 August 2008 (has links) A freshwater mussel survey was conducted in Indian Creek, Tazewell County, Virginia, during 1996 and 1997. Fifteen species were identified, including the federally endangered <i>Epioblasma florentina walkeri<i>, <i>Villosa perpurpurea</i>, and <i>Quadrula cylindrica strigillata</i>. Population assessments and fish host identifications were completed for the tan riffleshell and purple bean populations. Host fish for <i>E. f. walkeri</i> were limited to the banded and mottled sculpin, greenside darter, redline darter, fantail darter, and snubnose darter. Fish hosts identified for <i>V. perpurpurea</i> also were the banded and mottled sculpin, greenside darter, and redline darter. Size class structure of the tan riffleshell population ranged from 19.9 to 53.3 mm, with the population estimated at nearly 700 individuals with a density of 0.015/m². Size class structure of the purple bean population ranged from 22.9 to 66.7 mm, with the population estimated at only 70 individuals with a density of 0.002/m². Host fish also were identified for <i>Dromus dromas</i> and <i>Lemiox rimosus</i>. The fantail darter was identified as a host for <i>D. dromas</i>, with the snubnose darter serving as a host for <i>L. rimosus</i>. Additional percids were implicated as hosts for both mussel species. A molecular genetic key for identifying host fishes of the upper Clinch River also was constructed. The key was constructed through the analysis of restriction fragment length polymorphisms from amplified regions of mussel DNA. Thirty-six unionid species were incorporated into the key. No host fishes were identified due to an unsolved problem with amplifying DNA from glochidia collected from wild fish. / Master of Science mussels Unionidae Indian Creek Clinch River Powell River host fish polymerase chain reaction restriction fragment length polymorphism tan riffle shell purple bean bird-wing pearly mussel monkeyface dromedary pearly mussel LD5655.V855 1999.W387
17	Testing and Refining a Unique Approach for Setting Environmental Flow and Water Level Targets for a Southern Ontario Subwatershed Beaton, Andrew 15 August 2012 (has links) In this study Bradford’s (2008) approach for setting ecological flow and water level targets is tested and refined through application within the Lake Simcoe Region Conservation Authority’s (LSRCA) subwatershed of Lover’s Creek. A method for defining subwatershed objectives and identifying habitat specialists through expert input is proposed and tested. The natural regime of each streamflow and wetland site is characterized along with the hydrological alteration at each site. Potential ecological responses to the hydrologic alterations are then hypothesized for the different types of changes calculated at each site. Methods for setting overall ecosystem health and specific ecological objective flow targets are proposed and tested. These targets are integrated into a flow regime for each site and a process for using this information for decision making is suggested. Flow magnitude quantification is attempted using hydraulic modelling and sediment transport equations, however the data used were found to be inadequate for this application. The accuracy of the targets developed using the method presented in this paper is mainly limited by the accuracy of the hydrological model and quantified flow magnitudes. Recommendations for improving these components of the assessment are made. The unique approach and recommendations presented in this paper provide explicit steps for developing flow targets for subwatersheds within the LSRCA. This research contributes toward the advancement of EFA within the LSRCA, which provides opportunity for enhanced protection and restoration of ecosystem health across the watershed. / Lake Simcoe Region Conservation Authority Ecological flows environmental flow instream flow in-stream flow indicators of hydrologic alteration ecological flow components Lovers Creek Lake Simcoe Watershed streamflow wetland hydroperiod MIKE-SHE HEC-RAS HEC-GeoRAS Du Boyes equation Ontario Stream Assessment Protocol OSAP IHA Southern Ontario Ontario LSRCA flow regime decision making Ontario hydrologic model hydraulic model brook trout amphibian swamp Ontario Wetland Evaluation System ecological function hydrological function expert interview Delphi Technique geomorphic framework river stream hydrology cold water fish Andrea Bradford aquatic aquatic habitat aquatic biology groundwater land use change urbanization pool riffle pool-riffle

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