8,455 research outputs found
The Messianic Zeal: A Case of Radical Aesthetics in Black Cultural Production
This essay examines artwork by popular artists D’Angelo, Kanye West, Kendrick Lamar and 2pac Shakur and compares their articulations to a larger discourse of messianic symbolism in (black) American popular culture. In this paper, messianic symbolism is a discursive chain of symbols that invoke the Black experience. Artists extend the legacy of earlier representations of black messianism by similarly representing themselves as Jews, saviors or folk heroes with a specific mission to save a world burdened by racial strife and oppression. These qualities manifest in lyrics, album covers, and other late 20th century rhetoric
Carrion Beetles (Coleoptera: Silphidae) of Wisconsin
The first comprehensive faunal survey of the carrion beetles (Coleoptera: Silphidae) of Wisconsin is presented. Six genera and 14 species are recorded from the state, including a new state record, Heterosilpha ramosa (Say). Nicrophorus americanus Olivier was not recovered during this study. An annotated checklist includes species-specific geographical and temporal distributions, remarks on foods and habitat, and counties of specimen collections for each species
High-pressure droplet combustion studies
This is a joint research program, pursued by investigators at the University of Tokyo, UCSD, and NASA Lewis Research Center. The focus is on high-pressure combustion of miscible binary fuel droplets. It involves construction of an experimental apparatus in Tokyo, mating of the apparatus to a NASA-Lewis 2.2-second drop-tower frame in San Diego, and performing experiments in the 2.2-second tower in Cleveland, with experimental results analyzed jointly by the Tokyo, UCSD, and NASA investigators. The project was initiated in December, 1990 and has now involved three periods of drop-tower testing by Mikami at Lewis. The research accomplished thus far concerns the combustion of individual fiber-supported droplets of mixtures of n-heptane and n-hexadecane, initially about 1 mm diameter, under free-fall microgravity conditions. Ambient pressures ranged up to 3.0 MPa, extending above the critical pressures of both pure fuels, in room-temperature nitrogen-oxygen atmospheres having oxygen mole fractions X of 0.12 and 0.13. The general objective is to study near-critical and super-critical combustion of these droplets and to see whether three-stage burning, observed at normal gravity, persists at high pressures in microgravity. Results of these investigations will be summarized here; a more complete account soon will be published
A Risk Analysis of Carbon Sequestration in Claypan Soil with Conservation Tillage Systems and Nitrogen Fertilizers for Grain Sorghum and Soybean
Replaced with revised version of paper 02/15/06.carbon sequestration, carbon credits, nitrogen, risk, tillage, Crop Production/Industries, Risk and Uncertainty, Q12,
Analysis of the 2007/8 Defra Farm Business Survey Energy Module
Key points This study has delivered an invaluable baseline estimate of energy
use and greenhouse gas (GHG) emissions on commercial farms in England. Energy
use and GHG emissions associated with particular commodities were quantified and
results broadly agreed with those derived by Life Cycle Assessment, but with
much scatter in the environmental performance of farms.Direct energy use on
farms was generally less that indirect (embedded) energy use, except for
horticulture, which is dominated by heating fuel use. In contrast, most GHG
emissions are incurred on farms, rather than as embedded emissions.Scatter in
both environmental and economic performance underlies the somewhat disappointing
finding of no clear positive link between farm financial performance and energy
use or GHG emissions. However, the mere existence of these ranges shows that
there is scope for improvement in both financial and environmental performance
and that there is no apparent barrier for both to be achievable in harmony. The
recording of such farm-level energy data is essential for the future, as it
should enable improvements to be made in efficiency of energy use. The improved
UK agricultural GHG inventory will depend on high quality energy data on
agricultural activities. This study will be invaluable in identifying the level
of detail needed. Future data requirements include: contractor work rates and
fuel use per unit area and per unit time, fertiliser and pesticide use by brand
name, enhanced output data, especially animal live weights, and horticultural
produce recorded by weight rather than by value
Quantum interferometric optical lithography:towards arbitrary two-dimensional patterns
As demonstrated by Boto et al. [Phys. Rev. Lett. 85, 2733 (2000)], quantum
lithography offers an increase in resolution below the diffraction limit. Here,
we generalize this procedure in order to create patterns in one and two
dimensions. This renders quantum lithography a potentially useful tool in
nanotechnology.Comment: 9 pages, 5 figures Revte
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