126,525 research outputs found
Correspondence from Marshall S. Croft of Fort Stockton Chamber of Congress to Oscar E. Monnig, February 10, 1960
No full textLetter to Oscar E. Monnig from Marshall S. Croft about being unsuccessful identifying the individual who owned the meteorite in question but providing their addresses.WHERE PROSPERITY HAS FOUR CORNERSTONES - RANCHING, IRRIGATION, OIL, TOURISTS Fort Stockton Chamber of Commerce FORT STOCKTON, TEXAS February 10, 1960 Oscar E. Monnig Amateur Astronomy 1010 Morningside Dr. Fort Worth 4, Texas Dear Mr. Monnig: In regard to your letter of February 8, 1960, we have tried to determine the name of the man in question and have been unable to do so. However, we were able to find the addresses of the men you listed, provided they are still residents of Fort Stockton. W. P. Rooney 219 N. Water F. B. Wilson 107 N. Nelson C. S. Ten Eyck Sheriffs Office We hope we have been of some help to you. Sincerely yours, Marshall S. Croft, Manager. MSC/ms
Cultural activism and the politics of place-making
No full textIn this paper, we explore the relationship between creative practice, activism, and urban place-making by considering the role they play in the construction of meaning in urban spaces. Through an analysis of two activist groups based in Stokes Croft, Bristol (UK), we argue that cultural activism provides new political prospects within the wider context of global capitalism through the cultivation of a shared aesthetics of protest. By cultivating aspects of shared history and a mutual enthusiasm for creative practice as a form of resistance, Stokes Croft has emerged as a ‘space of nurturance’ for creative sensibilities. However, we note how Stokes Croft as an autonomous space remains open-ended and multiple for activists interested in promoting different visions of social justice
Archaeological and environmental investigations of Late Glacial and Holocene river valley sequences on the River Soar, at Croft, Leicestershire
No full textThe sediments, stratigraphy and archaeology of several sections through Lateglacial and
Holocene deposits associated with the past course of the Thurlston Brook at Croft, Leicestershire, UK are
outlined. The results of pollen, plant macrofossil and insect analyses from these deposits are presented and
this information is used to provide a detailed reconstruction of changing river conditions and human land
use at this location during the Holocene. Despite the presence of hiatuses in the record seen at Croft, and
other sites of this scale, with accurate work and clear dating controls it is possible to 'stitch' together
continuous detailed sequences. The general pattern of Holocene landscape and fluvial change appears to
echo that seen in the Trent valley region and nationally. It is suggested that small headwater catchments
such as at Croft have the potential to provide detailed and sensitive records of Holocene events comparable
with those from 'standard' sediment sequences
Reconstructing the gravitational lensing potential from the Lyman- α forest
No full textWe demonstrate a method for reconstructing the weak lensing potential from the Lyman-α forest data. We derive an optimal estimator for the lensing potential on the sky based on the correlation between pixels in real space. This method effectively deals with irregularly spaced data, holes in the survey, missing data, and inhomogeneous noise. We demonstrate an implementation of the method with simulated spectra and weak lensing. It is shown that with a source density of 0.5 per square arcmin and ∼200 pixels in each spectrum (λ/Δλ = 1300) the lensing potential can be reconstructed with high fidelity if the relative absorption in the spectral pixels is signal dominated. When noise dominates the measurement of the absorption in each pixel the noise in the lensing potential is higher, but for reasonable numbers of sources and noise levels and a high fidelity map the lensing potential is obtainable. The lensing estimator could also be applied to lensing of the cosmic microwave background, 21 cm intensity mapping, or any case in which the correlation function of the source can be accurately estimated
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The development of rail-head acoustic roughness
No full textA model of the development of rail-head acoustic roughness on tangent track has been formulated. The model consists of a two-dimensional time domain wheel-rail interaction force calculation, with the normal force used as the input to a two-dimensional rolling contact and wear model. The possibility of multiple wear mechanisms arising from stress concentrations is considered by using a wear coefficient that can vary with the conditions
at each point in the contact. The contact model is based on a variational technique, taking account of non-Hertzian and transient effects. A novel feature of the rolling contact model
is the introduction of a velocity-dependent friction coefficient. In rolling contact this leads to a high frequency stick-slip oscillation in the slip zone at the trailing edge. Roughness development depends on the dynamics of the track. Roughness growth
has often been linked to the pinned-pinned frequency and other resonances of the coupled track and vehicle system. Here the effect of different vehicle and track parameters on track
dynamics, wear and roughness development has been examined. Rail dampers are studied as they change the dynamic response of the track. Results are presented in the form of roughness growth rate functions both for individual vehicle types and for mixed traffic. The model parameters match those at a site used for measurements of roughness
development taken by Deutsche Bahn AG as part of the EU project Silence. The study shows that it is important to include non-Hertzian effects when studying roughness with wavelengths shorter than 100 mm. With a non-Hertzian contact model, no
mechanism has been found for consistently increasing roughness levels. The model predicts that roughness wavelengths shorter than the contact length will wear away. Rail
dampers are shown to reduce the pinned-pinned frequency and smooth the peaks and troughs in the track receptance. Rail dampers also reduce the dynamic wheel-rail
interaction forces, especially around the pinned-pinned resonance, and shift the force spectrum to lower frequencies or longer wavelengths. However, rail dampers are not
predicted to affect roughness growth rates significantly
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