1,793,701 research outputs found
Letter with attachment: Henry E. Pond to Ida M. Tarbell, November 9, 1922
No full textLetter with typed copy of court records People v. Marvin B. Pon
Biological traits of European pond macroinvertebrates
No full textWhilst biological traits of river macroinvertebrates show unimodal responses to geographic changes in habitat conditions in Europe, we still do not know whether spatial turnover of species result in distinct combinations of biological traits for pond macroinvertebrates. Here, we used data on the occurrence of 204 macroinvertebrate taxa in 120 ponds from four biogeographic regions of Europe, to compare their biological traits. The Mediterranean, Atlantic, Alpine, and Continental regions have specific climate, vegetation and geology. Only two taxa were exclusively found in the Alpine and Continental regions, while 28 and 34 taxa were exclusively recorded in the Atlantic and Mediterranean regions, respectively. Invertebrates in the Mediterranean region allocated much energy to reproduction and resistance forms. Most Mediterranean invertebrate species had narrow thermal ranges. In Continental areas, invertebrates allocated lesser energy to reproduction and dispersal, and organisms were short lived with high diversity of feeding groups. These characteristics suggest higher resilience. The main difference between ponds in the Alpine and Atlantic regions was their elevation. Alpine conditions necessitate specific adaptations related to rapid temperature fluctuations, and low nutrient concentrations. Even if our samples did not cover the full range of pond conditions across Europe, our analyses suggest that changes in community composition have important impacts on pond ecosystem functions. Consistent information on a larger set of ponds across Europe would be much needed, but their low accessibility (unpublished data and/or not disclosed by authors) remains problematic. There is still, therefore, a pressing need for the incorporation of high quality data sets into a standardized database so that they can be further analyzed in an integrated European-wide manner
Vegetation and discharge effects on the hydraulic residence time distribution within a natural pond
No full textResults are presented from sets of field and laboratory experiments conducted to
measure and quantify the Hydraulic Residence Time Distribution in treatment
ponds containing vegetation. The field measurements were taken in the Lyby field
pond (Sweden) with complementary experiments on a distorted, laboratory scale
model pond designed and built in the University of Warwick’s engineering
laboratory. Rhodamine WT Dye tracer experiments were used in both the Lyby
field pond and the distorted physical scale model to investigate vegetation and
discharge affects on HRTD characteristics and the technique of PIV (Particle
Image Velocimetry) was used in the distorted physical scale model to investigate
how surface flow profiles were affected by different vegetation and discharge
configurations.
The results show that the distorted physical scale pond did not reflect the HRTD
characteristics of the field site, with the actual residence time, (tm), for the distorted
physical scale pond ranging from 85 % to 125% of its nominal residence time. For
the distorted scale model, pond vegetation and discharge did not affect the relative
HRTD centroid, em, or the actual residence time, tm. This finding is attributed to
the unique pond geography and associated aspect ratios However, flow rates did
have a significant effect on the HRTD e0 (time of first dye arrival at the outlet) and
ep (time of peak dye concentration). Changes in vegetation were found to have
little effect on e0 and ep. For the laboratory pond, vegetation had a significant
control on the surface flow field whereas, flow rates did not – the latter suggests
that surface flow fields are not representative of the internal flow field in different
layers of the pond.
The experiments demonstrate that the specific shape of the distorted physical
scale pond in this study enables optimal actual resident times to be achieved over
a wide range of vegetation and flow rate configurations. If full scale field ponds
based upon this design give the same stable centroid results, then this would be a
substantial breakthrough in pond design, which would aid the design and
management of pond treatment and allow more robust optimisation of treatment
efficiency
Operation and recovery of a seasonally-loaded UK waste stabilisation pond system
No full textAn intermittent discharge waste stabilisation pond system was trialled for treatment of a seasonal wastewater load from a campsite. The system showed rapid acclimatisation to incoming load, with chlorophyll-a exceeding 700 mg l?1 within 2 weeks and filtered and unfiltered effluent biochemical oxygen demand below 20 and 30 mg l?1 respectively. Good performance continued for some weeks, after which photosynthetic oxygenation capacity in the first pond was seriously impaired by a shock loading believed to include fatty material. Inflow to the system was suspended and a surface film was broken up, after which the pond recovered within an 8-day period. Laboratory experiments indicated that interventions such as artificial aeration and dilution with effluent had no beneficial effect although mixing may have increased the rate of recovery
Pond research and management in Europe: "Small is Beautiful"
No full textThe phrase "Small is Beautiful" was first used by the talented scholar Leopold Kohr (1909 131994), but it becames more popular thanks to the essays of one of his students, the British economist E. F. Schumacher, and it was coined as a response to the socially established idea that "Big is Powerful". It could be argued that this desire for "bigness" explains why current legal frameworks and the conservation planning and management related to standing waters often overlook ponds, despite their well-known value in terms of biodiversity and socio-economic benefits (Oertli et al., 2004; Cereghino et al., 2008). Of course, this is only one of several possible explanations, but it is important to understand that such long-established ideas can have a lasting effect upon the efficiency of our conservation actions. Beyond this social perspective, the history of science can also provide some explanation as to why ponds have been undervalued for so long
Donald Pond Collection
No full textDonald Pond (1906-1983) was a music educator, composer, and performer. Born in England, Pond immigrated to New York City at the age of twenty-seven and began working at the Dalton School, the Children's Theatre Arts Workshop, and as a guest lecturer at Teachers College, Columbia University. In 1937, Pond became the Music Director of the Pillsbury Foundation School, which was established with assistance from Leopold Stokowski for the study of young children's spontaneous music-making. After leaving the school in 1945, Pond stayed in the Santa Barbara, CA area and worked as a pianist, a teacher for the Music Academy of the West, and was the host of "Pleasure in Pictures," a music themed radio program. The collection consists of letters, writings, scores, books, articles, photographs, clippings, publications, radio scripts, observation notes, and sound recordings related to Pond's life and work
Virginia Tech Duck Pond Retrofit for Improved Water Quality in Stroubles Creek
No full textStroubles Creek is registered on Virginiaâ s 303(d) list of impaired waters for both benthic and fecal coliform impairments. The upper reach of the creekâ s watershed drains into two ponds on the Virginia Tech campus. The area draining to the ponds, approximately 715 acres, encompasses most of the Town of Blacksburg and the Virginia Tech campus. Below the ponds, the creekâ s watershed is primarily forested and agricultural, with some areas of residential development.
In order to improve water quality downstream, the two ponds will be converted to a water quality facility by redirecting all flow from the northern branch of Stroubles Creek into the upper, smaller pond, which then flows into the larger pond below. With flow into the upper pond increasing dramatically, the dam between the two ponds and associated overflow structures were evaluated and redesigned to protect the dam from overtopping and possible washout. In addition, concrete weirs were designed and will be constructed on both branches of Stroubles Creek above the ponds for future installation of flow and water quality monitoring equipment. Above the ponds, the banks along both branches of the creek have become severely eroded. Interlocking concrete block armoring was designed for the stream banks to reduce erosion and protect the trees growing along the creek.
This project was jointly funded by Virginia Tech and a grant from the Virginia Department of Conservation and Recreation Water Quality Improvement Fund. Construction will be performed by the Capital Design department of Virginia Tech.Master of Scienc
Wreck Pond in Spring Lake
No full textWreck Pond is a coastal freshwater tidal pond surrounded by Wall Township and the boroughs of Spring Lake, Spring Lake Heights, and Sea Girt. The pond was originally connected to the sea by a small inlet and got its name because sailors would mistake it, in the dark, for the Manasquan Inlet, which is further south which resulted in several shipwrecks.Original file name Swans in Wreck Pond Spring Lake.jp
Brundage Pond
No full textThis pond in the Brundage Park Preserve is used for fishing and ice skating.Original file name Brundage Pond.jp
Wreck Pond in Spring Lake
No full textWreck Pond is a coastal freshwater tidal pond surrounded by Wall Township and the boroughs of Spring Lake, Spring Lake Heights, and Sea Girt. The pond was originally connected to the sea by a small inlet and got its name because sailors would mistake it, in the dark, for the Manasquan Inlet, which is further south which resulted in several shipwrecks.Original file name Swans in Wreck Pond Spring Lake.jp
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