The 2dF gravitational lens survey

The 2 degree Field (2dF) galaxy redshift survey will involve obtaining approximately 2.5 x 10^5 spectra of objects previously identified as galaxy candidates on morphological grounds. Included in these spectra should be about ten gravitationally-lensed quasars, all with low-redshift galaxies as deflectors (as the more common lenses with high-redshift deflectors will be rejected from the survey as multiple point-sources). The lenses will appear as superpositions of galaxy and quasar spectra, and both cross-correlation techniques and principal components analysis should be able to identify candidates systematically. With the 2dF survey approximately half-completed it is now viable to begin a systematic search for these spectroscopic lenses, and the first steps of this project are described here.Comment: PASA (OzLens edition), in press; 4 pages, 0 figure

Slab failure or slab success? Examining the contributions of crust and mantle to post-subduction magmatism in the Ratagain Complex, NW Scotland

The Ratagain Complex is an enigmatic Late Caledonian granitic intrusion and a member of the high Basingle bondSr Northern Highlands granite (NHG) suite that has been related to slab failure. Slab failure magmatism explains varying contributions of mafic and felsic magmas in post-collision orogenic settings. It is therefore of major importance in understanding crustal accretion. However, the source and nature of any mantle derived contribution is poorly understood. This study reveals that Ratagain is not only transitional in nature between the high Basingle bondSr calc-alkaline granites and syenite intrusions of the Northern Highlands Terrane, but overlaps with the entire compositional range of the NHG suite. New lithogeochemical data from Ratagain confirm remarkably high Sr (>1600 ppm) and Ba (>2200 ppm) contents, high LREEs, notable depletions in Nb, U, P and Ti, low HREEs and negligible Eu anomalies, associated with high initial 87Sr/86Sr (0.7055 to 0.7062) and low εNd (− 11.8 to −13.3). Although mafic parts of the complex have strong elemental and isotopic similarities with broadly coeval lamprophyres, signalling derivation from enriched mantle sources, details of the isotope array with respect to local crustal reservoirs indicate a significant Lewisian component. Such geochemical characteristics, combined with tectonic and petrological evidence, may be attributable to long-lived, incremental emplacement of successive magma batches originating from the same enriched mantle but differing in age and extent of assimilation-fractionation crystallisation. We therefore propose that some of the age dates for the Late Caledonian intrusions, particularly those obtained from older geochronology studies, are in need of review as they may record early crystallisation in the deep crust and not be a valid proxy for granite emplacement

Effect of shoe inserts on kinematics, center of pressure, and leg joint moments during running

The purposes of this project were to assess the effect of four different shoe inserts on the path of the center of pressure (COP), to quantify the effect of these inserts on selected knee joint moments during running, and to assess the potential of COP data to predict the effects of inserts/orthotics on knee joint moments.; Kinematics for the lower extremities, resultant ankle and knee joint moments, and the path of the COP were collected from the right foot of 15 male subjects while running heel-toe with five different shoe inserts (full or half with 4.5-mm postings).; Individual movement changes with respect to the neutral insert condition were typically small and not systematic. Significant changes for the path of the COP were registered only for the full lateral insert condition with an average shift toward the lateral side. The mediolateral shift of the COP was not consistent for the full medial and the two half-shoe inserts. The subject-specific reactions to the inserts' intervention in the corresponding knee joint moments were typically not consistent. Compared with the neutral insert condition, subjects showed increases or decreases of the knee joint moments. The correlation between the individual COP shifts and the resultant knee joint moment was generally small.; The results of this study showed that subject-specific reactions to the tested inserts were often not as expected. Additionally, reactions were not consistent between the subjects. This result suggests that the prescription of inserts and/or orthotics is a difficult task and that methods must be developed to test and assess these effects. Such methods, however, are not currently available

2011-2012 Mostly Music: Schumann

https://spiral.lynn.edu/conservatory_mostlymusic/1014/thumbnail.jp

Trophic Cascades, Nutrients, and Lake Productivity: Whole-Lake Experiments

Responses of zooplankton, pelagic primary producers, planktonic bacteria, and CO2 exchange with the atmosphere were measured in four lakes with contrasting food webs under a range of nutrient enrichments during a seven-year period. Prior to enrichment, food webs were manipulated to create contrasts between piscivore dominance and planktivore dominance. Nutrient enrichments of inorganic nitrogen and phosphorus exhibited ratios of N:P \u3e 17:1, by atoms, to maintain P limitation. An unmanipulated reference lake, Paul Lake, revealed baseline variability but showed no trends that could confound the interpretation of changes in the nearby manipulated lakes. Herbivorous zooplankton of West Long Lake (piscivorous fishes) were large-bodied Daphnia spp., in contrast to the small-bodied grazers that predominated in Peter Lake (planktivorous fishes). At comparable levels of nutrient enrichment, Peter Lake\u27s areal chlorophyll and areal primary production rates exceeded those of West Long Lake by factors of approximately three and six, respectively. Grazers suppressed pelagic primary producers in West Long Lake, relative to Peter Lake, even when nutrient input rates were so high that soluble reactive phosphorus accumulated in the epilimnions of both lakes during summer. Peter Lake also had higher bacterial production (but not biomass) than West Long Lake. Hydrologic changes that accompanied manipulation of East Long Lake caused concentrations of colored dissolved organic carbon to increase, leading to considerable variability in fish and zooplankton populations. Both trophic cascades and water color appeared to inhibit the response of primary producers to nutrients in East Long Lake. Carbon dioxide was discharged to the atmosphere by Paul Lake in all years and by the other lakes prior to nutrient addition. During nutrient addition, only Peter Lake consistently absorbed CO2 from the atmosphere, due to high rates of carbon fixation by primary producers. In contrast, CO2 concentrations of West Long Lake shifted to near-atmospheric levels, and net fluxes were near zero, while East Long Lake continued to discharge CO2 to the atmosphere

2016-2017 Mostly Music: Shostakovich

https://spiral.lynn.edu/conservatory_mostlymusic/1027/thumbnail.jp

2018-2019 Mostly Music: Johann Sebastian Bach

https://spiral.lynn.edu/conservatory_mostlymusic/1031/thumbnail.jp