8,075 research outputs found
PRELIMINARY DESIGN OF A TREATMENT SYSTEM TO REMEDIATE ACID ROCK DRAINAGE INTO JONATHAN RUN
No full textJonathan Run is a tributary of Beech Creek that is impacted with fill material containing acid rock and clay during the construction of I-80 in Centre County, Pennsylvania. The acidic discharges into Jonathan Run contain white aluminum precipitates resulting in surface water quality degradation and loss of sustaining aquatic life. The purpose of this research is to identify sources of acid rock discharge and to conduct research aimed at identifying and developing methods to cost-effectively eliminate, mitigate, or treat acid rock discharge. Based on field research and subsurface investigations, preliminary suggestions are made involving flow elimination, by way of covering the acidic rock source or removing the groundwater, mitigation by injecting alkaline material into the source to neutralize the acid producing potential, and passive and/or active treatment systems to increase the pH of the water and allow metal precipitation. An active treatment system was selected for the major contaminated discharge into Jonathan Run while a passive treatment system was selected for a less contaminated discharge. A preliminary design is presented consisting of two vertical flow ponds, each designed to treat 100 gpm of flow. At this flow each pond will have a detention time of 24 hours and will each contain 2,050 tons of limestone, 19.5 inches in depth of organic compost consisting of mushroom compost and wood chips, and a ponded water layer of 4 ft. The ponds will discharge into a settling pond that will be 100' x 24' x 10'. The active system will consist of the chemical addition of sodium hydroxide at an average rate of 0.0298 gpm mixed through the contaminated water by stationary baffles or large rocks under turbulent conditions. The water will then discharge into a primary settling pond that is 79' x 20' x 6' in dimension and then combine with the discharge from the vertical flow ponds in the second settling pond before entering back into Jonathan Run
How the amount of copper influences the formation and stability of defects in CdTe solar cells
No full textWith a 22.1% efficiency record and the successful results in terms of production yield, CdTe based thin film solar cells are today a competing technology with traditional silicon solar cells. Despite different copper-free back contacts have been applied, Cu is present in all the most performing CdTe devices. On the other hand, it is well known that Cu is a fast diffuser in CdTe, and it heavily influences the devices degradation; thus controlling its concentration is very important. In this paper a study of the influence of copper quantity on the performance of the devices and stability at the back contact is presented. CdTe cells fabricated with a 0.1 nm thick Cu layer are compared to devices fabricated with 2.0, 1.0 and 0.5 nm thick Cu layers. The amount of copper affects the performance and aging of the samples. Moreover an inversion of the bias dependency (solar cells in open circuit or in short circuit under current flow), during the aging, occurs in samples containing a copper layer below a certain thickness, suggesting that another degradation mechanism predominates
Medicare Part D and the Financial Protection of the Elderly
No full textWe examine the impact of the expansion of public prescription drug insurance coverage from Medicare Part D on the elderly and find evidence of substantial crowd-out. Using detailed data from the 2002-7 waves of the Medical Expenditure Panel Survey (MEPS), we estimate that the extension of Part D benefits resulted in 80% crowd-out of both prescription drug insurance coverage and prescription drug expenditures of those 65 and older. Part D is associated with only modest reductions in out-of-pocket spending. This suggests that the welfare gain from protecting the elderly from out-of-pocket spending risk through Part D has been small.
Citizen participation in news
No full textThe process of producing news has changed significantly due to the advent of the Web, which has enabled the increasing involvement of citizens in news production. This trend has been given many names, including participatory journalism, produsage, and crowd-sourced journalism, but these terms are ambiguous and have been applied inconsistently, making comparison of news systems difficult. In particular, it is problematic to distinguish the levels of citizen involvement, and therefore the extent to which news production has genuinely been opened up. In this paper we perform an analysis of 32 online news systems, comparing them in terms of how much power they give to citizens at each stage of the news production process. Our analysis reveals a diverse landscape of news systems and shows that they defy simplistic categorisation, but it also provides the means to compare different approaches in a systematic and meaningful way. We combine this with four case studies of individual stories to explore the ways that news stories can move and evolve across this landscape. Our conclusions are that online news systems are complex and interdependent, and that most do not involve citizens to the extent that the terms used to describe them imply
Morphologic and functional correlates of synaptic pathology in the cathepsin D knockout mouse model of congenital neuronal ceroid lipofuscinosis
No full textMutations in the cathepsin D (CTSD) gene cause an aggressive neurodegenerative disease (congenital neuronal ceroid lipofuscinosis) that leads to early death. Recent evidence suggests that presynaptic abnormalities play a major role in the pathogenesis of CTSD deficiencies. To identify the early events that lead to synaptic alterations, we investigated synaptic ultrastructure and function in presymptomatic CTSD knockout (Ctsd) mice. Electron microscopy revealed that there were significantly greater numbers of readily releasable synaptic vesicles present in Ctsd mice than in wild-type control mice as early as postnatal day 16. The size of this synaptic vesicle pool continued to increase with disease progression in the hippocampus and thalamus of the Ctsd mice. Electrophysiology revealed a markedly decreased frequency of miniature excitatory postsynaptic currents (mEPSCs) with no effect on paired-pulse modulation of the evoked excitatory post synaptic potentials in the hippocampus of Ctsd mice. The reduced mEPSCs frequency was observed before the appearance of epilepsy or any morphologic sign of synaptic degeneration. Taken together, these data indicate that CTSD is required for normal synaptic function and that a failure in synaptic trafficking or recycling may bean early and important pathologic mechanism in Ctsd mice; these presynaptic abnormalities may initiate synaptic degeneration in advance of subsequent neuronal loss
Tar sandstone investigation in southwestern Uinta Basin
No full textreportDuring the month of July 1972, the author assisted by Jonathan Mann studied the oil impregnated sandstone (hereafter OISS) deposits in the Lower Unit of the Parachute Creek Member of the Green River Formation on the southwestern edge of the Uinta Basin, along the Roan Cliffs and within the Roan Plateau. Careful mapping was conducted to determine the extent of the Sunnyside OISS deposit and to relate it to other deposits in the general vicinity. In addition to this mapping, which was restricted to the Flat Canyon and Sunnyside 15 min. quadrangles, (correlation investigations? ) were carried out in Nine Mile Canyon, Argyle Canyon, Indian Canyon, and at the headwaters of Avintaquin Canyon near Reservation Ridge (see USGS 7 1/2 min. quadrangles Gray Head Peak, 1969, and Flat Ridge, Utah, 1969). These areas, in this report, are further subdivided into smaller regions (often ridges or canyons) for further expansion of the results of the investigation. A number of the canyons could only be studied by hiking them through, others because of the size of the area studied and time requirements were studied by numerous stops from a four-wheel-drive truck. A field method to categorize the estimated richness of the OISS was used in the mapping: A numeral from I-V was assigned to a deposit, I being void of tar and progressing with each number until very rich OISS would be classed as V
Faculty recital series: Jonathan Bass, piano, March 18, 2008
No full textThis is the concert program of the Faculty recital series: Jonathan Bass, piano performance on Tuesday, March 18, 2008 at 8:00 p.m., at the Tsai Performance Center, 685 Commonwealth Avenue. Works performed were Sonata in E-Flat Major, Hob. XVI: 52 by Franz Joseph Haydn, Sonata No. 2 in B-Flat Minor, Op. 35 by Frédéric Chopin, Sonata, Op. 26 by Samuel Barber, and Prelude in D Major, Op. 23 No. 4 by Sergei Rachmaninoff, Prelude in G Major, Op. 32 No. 5 by S. Rachmaninoff, and Prelude in B-Flat Major, Op. 23 No. 2 by S. Rachmaninoff. Digitization for Boston University Concert Programs was supported by the Boston University Center for the Humanities Library Endowed Fund
Major Thomas Jonathan Jackson, 1851
No full textThis image of Thomas Jonathan "Stonewall" Jackson was taken in 1851, shortly before he retired from the U.S. Army and began teaching at the Virginia Military Institute. He later became a Lieutenant-General in the Confederate Army.
Handwritten on image: Stonewall Jackson
Handwritten on verso: Stonewall Jackson
Printed on verso: Charles D. Fredricks & Co., "Specialite," 587 Broadway, New York.
PH Coll 654.30To order a reproduction, inquire about permissions, or for information about prices see: http://www.lib.washington.edu/specialcollections/services/reproduction/reproduction Please cite the Order Numbe
Jonathan Hodges, Violin
No full textCaprice No. 20 in D major , op. 1 / Niccolo Paganini; Sonata in D minor for Violin and Piano / Johannes Brahm
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