1,354,953 research outputs found
Former Director of National Intelligence James Clapper on public trust and national intelligence
No full textIn this episode of Case in Point, Penn Law Professor Claire Finkelstein interviews Former Director of National Intelligence James Clapper about his book, Facts and Fears: Hard Truths from a Life in Intelligence
Using an unoccupied aerial vehicle to study Clapper Rail demography in the salt marshes of coastal Delaware, USA
No full textShriver, W. GregoryUnoccupied Aerial Vehicles (UAVs) provide novel methods to study wildlife in a potentially more efficient manner than traditional methods. UAV methods can be particularly useful for studying secretive marsh birds, as marsh accessibility varies greatly, and UAVs can provide access to otherwise inaccessible areas. I used a UAV equipped with a thermal imaging camera to search for Clapper Rail (Rallus crepitans) and other tidal marsh birds nesting in salt marshes on the Delaware coast, USA in 2021 - 2022. I conducted traditional ground-based systematic nest searches with a field crew at two intensive sites with different levels of accessibility. I piloted the UAV equipped with a thermal imaging camera over the same two sites and compared the number of nests detected between ground surveys and the thermal camera deployed on the UAV. I completed thermal imaging flights before sunrise for the greatest thermal contrast between the nests and the marsh vegetation. I ground-truthed suspected nest points after each flight to confirm that the point was a nest and determine which marsh bird species each nest belonged to, as distinguishing species from the thermal imaging alone is difficult. I found that the UAV detected fewer Clapper Rail nests than ground surveys in the accessible sites (17 and 28 nests respectively) and the UAV detected more Clapper Rail nests than the ground surveys where access was low (16 and 5 nests respectively). I also detected nests of tidal marsh passerines like Seaside Sparrow (Ammospiza maritima), Marsh Wren (Cistothorus palustris), and Red-winged Blackbird (Agelaius phoeniceus), indicating that thermal imaging flights with UAVs could be used to document smaller species breeding in tidal marshes. Using data collected in 2021 and 2022, I compared the efficiency of each method of finding marsh bird nests (ground surveys vs UAV) to determine method efficiency. I found that the UAV covered more area than the systematic nest searches, but on average took more time than the systematic nest searches. I also conducted photogrammetric surveys of the vegetation at all study sites to gain insight into the marsh vegetation characteristics at and around Clapper Rail nests. I compared these characteristics at nest points and random points to determine if a difference could be detected. I found that Clapper Rail nest sites contained 60% more low marsh, 40% less high marsh, and 20% less upland than the random points. Given the current conservation challenge associated with maintaining tidal marsh breeding birds during rapid increases in sea-levels, a non-invasive and rapid survey method that can efficiently document and quantify breeding and vegetation characteristics can aid in prioritizing marshes for conservation, management, or restoration.University of Delaware, Department of Entomology and Wildlife EcologyM.S
Dynamics of a clapper-to-bell impact
No full textChurch bells are exposed to severe loading conditions during ringing, which results in different damage modes due to material wear, fatigue loading, material deficiencies, different clapper-to-bell layouts, etc. As part of the activities of an EU-funded project called Maintenance and Protection of Bells (PROBELL), experimental investigations and finite-element simulations of the local contact between the clapper and the bell were carried out to study the wear-related damage to bells. First a simplified model was built to assess under the laboratory-controlled conditions the consequences of the repetitive impacts between a spherical body made from steel and a flat block made from bronze. After the results of the finite-element simulations for a simplified model were in reasonable agreement with the measured data a full-scale finite-element model for simulating the repetitive clapper-to-bell strokes was built. The simulations with the full-scale model were performed for variations of the parameters that influence the structural behaviour of the bell and the clapper: the clapper material, the clapper mass, the relative impact velocity of the clapper, the shape of the clapper, the clapper's pin support, the clapper's impact angle, the clapper's guide accuracy, the bell's sound-burp thickness and the coefficient of friction between the clapper and the bell. The agreement between the simulated and the measured results and the relation between the local stress–strain state and the damage to the bell in the contact area are discussed
Easter clapper
No full textTato práce představuje výrobu velikonoční řehtačky, která je symbolem Velikonoc. Vysvětluje
také velikonoční zvyky, které se k řehtačkám vztahují. Výroba byla realizována v předmětu
SPRA (Školní praktika A). Jednalo se o výrobu funkční repliky, která vznikla z poškozené
řehtačky, ze které byl převzat pouze rotační válec.This paper presents the production of easter clapper, which is a symbol of Easter. Explains
the easter traditions, that relate to easter clappers. Production was carried in the school
subject called SPRA (School practics A). It was the production of a functional replica that
was created from the damaged clapper, which was taken only rotation roller
Wayne’s Clapper Rail Incubating 10 Eggs
No full textSepia photograph of a brooding Wayne’s Clapper Rail among the grass. Date is approximate.https://digitalcommons.usf.edu/fos_images/1395/thumbnail.jp
Extending the Clapper-Yule model to rough printing supports
No full textThe Clapper-Yule model is the only classical spectral reflection model for halftone prints that takes explicitly into account both the multiple internal reflections between the print-air interface and the paper substrate and the lateral propagation of light within the paper bulk. However, the Clapper-Yule model assumes a planar interface and does not take into account the roughness of the print surface. In order to extend the Clapper-Yule model to rough printing supports (e.g., matte coated papers or calendered papers), we model the print surface as a set of randomly oriented microfacets. The influence of the shadowing effect is evaluated and incorporated into the model. By integrating over all incident angles and facet orientations, we are able to express the internal reflectance of the rough interface as a function of the rms facet slope. By considering also the rough interface transmittances both for the incident light and for the emerging light, we obtain a generalization of the Clapper-Yule model for rough interfaces. The comparison between the classical Clapper-Yule model and the model extended to rough surfaces shows that the influence of the surface roughness on the predicted reflectance factor is small. For high-quality papers such as coated and calendered papers, as well as for low-quality papers such as newsprint or copy papers, the influence of surface roughness is negligible, and the classical Clapper-Yule model can be used to predict the halftone-print reflectance factors. The influence of roughness becomes significant only for very rough and thick nondiffusing coatings. © 2005 Optical Society of America.LS
John Clapper
No full textJohn Clapper was a member of the 134th Indiana.This item was part of the Indiana History Train 2006 exhibit: Faces of the Civil War
Clapper Tongue and Moon Walker
No full textClapper Tongue and Moon Walker were created from research on the coastline fortifications at Berwick-upon-Tweed during the Berwick Gymnasium Fellowship (October 2008-March 2009) funded by Arts Council England and English Heritage.
Clapper Tongue is a 45-kg bronze life cast head and shoulders in the form of a bell suspended from the ceiling, fitted with an electronic strike hammer, ringing on an hourly timer. Cobbing liaised with the Whitechapel Bell Foundry to establish the optimum high copper bronze alloy to achieve a resonant sound for the bell-like sculpture, to account for its unusual non-symmetrical shape. Clapper Tongue also referenced the warning bell tower that was tolled when enemy lines approached the town, part of the area’s broader defensive architecture, from artillery ramparts built in 1558 to WWII concrete pillboxes. The title ‘Clapper Tongue’ refers to the anatomy and anthropomorphism of bronze bells, parts of which are labelled ‘neck’, ‘lip’, ‘shoulder’, and ‘clapper tongue.’
Moon Walker (13:15 mins) is a video documenting Cobbing walking backwards in a circle besides the Berwick coastline, with footage reversed so that he appeared to be walking forwards into his footprints in the sand. The performative action engages with Roberts Smithson’s theorization of entropy in ‘Monuments of Passaic’ (1967); namely how earthly material is subject to an irreversible process of erosion and dispersal. The erasure of a ‘drawn’ line of footprints along the coast in the Moon Walker video also echoes the palimpsest of shifting borderlines between England and Scotland in Berwick
[A full plant with many oblong shaped leaves]
No full textHannah Clapper ALS to Elisabeth Barnett, June 6, 1861. Plymouth, IN, page 2. From a collection of papers consisting of the family letters of Elisabeth Fisher along with financial records, photographs, ephemeral items, and eight miscellaneous items. The most common themes of the letters are family news and finances, fashion, religion, courtship, marriages, deaths, and opinions about the Civil War
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