Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"shredder"”.
-
Design of a human-powered leaf and branch shredder
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
-
Effects of forest disturbance on shredder production in headwater streams
… were investigated by comparing leaf biomass and shredder production in disturbed versus reference forest streams. Benthic samples were collected monthly in 3 streams in a mature hardwood reference forest and 3 streams in an 11-year-old clearcut. Reference forest streams had significantly greater …
-
The role of shredders in detrital dynamics of permanent and temporary streams
… dynamics with the composition and production of shredder populations and 2) to present evidence of a shredder regulatory role in headwater strewn detrital dynamics. The importance of leaf shredding aquatic insects (shredders) in the breakdown of leaf detritus and production of particulate organic …
-
Livestock Exclusion Effects on the Structure and Function of Headwater Streams
… coarse benthic organic matter and percent shredder density, and scraper density generally followed patterns of algal biomass among treatments. Leaf breakdown rates among treatments were not indicative of differences in shredder density with two of the three fenced sites having the fastest …
-
The influence of elevated arsenic concnetrations on stream biota and leaf breakdown in a headwater stream
… under laboratory conditions. However, shredder abundance on leaf packs was eight to twenty times greater upstream than the mine-influenced reach. Leaf breakdown rate varied two to three fold among sites distributed above and below the mine and were significantly lower in reaches of …
-
Assessing Organic Matter Breakdown and Associated Macroinvertebrate Community Structure in Headwater Streams: Effects of Hydrologic Gradients and Upland Timber Harvesting
… composition. Temporary reaches contained higher shredder, gathering-collector, predator, and total macroinvertebrate abundances. Shredder and total macroinvertebrate biomass was also higher in the temporary stream reaches. Gathering-collector biomass along one measurement was higher in the …
-
Influences of land use on the structure and function of headwater streams: A multiple scale analysis
… Leaf breakdown rate increased among sites with shredder density and biomass. Further, breakdown rate and shredder density and biomass were positively related to mean substrate particle size. Though several instream variables were related to watershed-scale features, leaf breakdown rate was not …
-
Assessment of a Shredding Technology of Waste Printed Circuit Boards in preparation for Ammonia-based Copper leaching
… tested included the use of an industrial grab shredder to size reduce and delaminate the PCBs, use of a planetary ball mill and some instances including precursors such as freezing the PCBs in liquid nitrogen or soaking the boards in NaOH to remove the upper- and lowermost epoxy layers. The …
-
Mechanical characterization of aged recycled polymers and applications
… (PC) thermoplastics obtained as electronic shredder residue (ESR) from computer housings. Three forms of polymers, i.e., virgin, blend of virgin and recycled, and 100% recycled were investigated to establish their long term mechanical properties. Chopped and continuous glass fiber/fabric …
-
Mechanical property characterization of recycled thermoplastics
… monitors and printers called as electronic shredder residue is described in the following thesis. Virgin, blend of virgin and recycled, and 100% recycled polymers such as acrylonitrile butadiene styrene (ABS) and polycarbonate (PC) are characterized for mechanical properties as part of this …
-
Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
… of organic matter. Compared to omnivores, shredder-detritivores may exert stronger effects on turnover and decomposition of organic material within lotic systems.</p>
-
The effects of cattle exclusion on stream structure and function
… at recently grazed sites. Leaf breakdown and shredder density were strongly correlated with riparian vegetation density. This study suggests that in addition to cattle exclusion, reforestation of woody riparian vegetation may be essential to restore functional integrity to agricultural streams.
-
Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… representative aquatic insects, Peltoperlidae (shredder) and Diplectrona modesta (collectorfilterer), was not affected by defoliation. Glossosoma nigrior (scraper) achieved higher production because of a second-generation being induced by elevated temperature. I conclude that the short-term …
-
Litter Breakdown And Benthic Invertebrate Detritivores From A Hydrologically Restored Stream
… large variation from the restored site. However, shredder biomass was greater in restored pools due to a few large Pycnopsyche individuals, and collector-filterers had significantly greater abundance in the restored stream. Findings from this study provide baseline decomposition rates from a …
-
Bottom-up effects of aboveground biota, invasive species and drought on soil animal communities
… of carrion beetles), and an invasive leaf litter shredder (lawn shrimp) at varying leaf litter densities. The impact of extreme drought on nematodes and microarthropods was examined in a field experiment, pairing drought simulation with grassland association manipulation. <br/><br/>Multiple …
-
Modeling methods for complex manufacturing systems : studying the effects of materials substitution on the automobile recycling infrastructure
… for using the system's waste, automobile shredder residue (ASR). The system model was run against retired fleets made up of three vehicles: predominantly steel, aluminum intensive, and polymer composite intensive (CIV). Results indicated that the current recycling system maintains …
-
Legacies of Early 20th Century Logging in Southern Appalachian Streams
… had significantly greater proportions of shredders while streams in logged catchments had significantly greater proportions of scrapers. Ecosystem parameters showed that the linkages between streams and the forests they drain were weaker in logged than unlogged streams and that unlogged …
-
Recovery of southern Appalachian streams from historical agriculture
… lower macroinvertebrate biodiversity, fewer shredder-detritivore invertebrates, and more pollution-tolerant organisms characterized agricultural streams compared to forested streams, but each of these biological features was similar in long-term forested streams and streams with reforested …
-
Enhancing Corrosion Resistance and Hardness Properties of High-Carbon Steel and Aluminium Bronze Alloy Through Novel Surface Modification Technique
… and complex mixture of plastics from Automotive Shredder Residue (ASR) were discarded into landfills every year, polluting the environment. Combining these two major issues, we delivered an alternative solution to enhance corrosion resistance of high carbon steel. Series of multi-hybrid layers …
-
Microbial and metazoan effects on nutrient dynamics during leaf decomposition in streams
… nutrient recycling (CNR) and grazing by two shredders on microbial uptake under different N regimes. Animals only influenced microbial uptake under low N conditions. Shredder CNR generally stimulated uptake while grazing had a negative effect. My research provides a robust model describing N …
Page 1 of 2