Results 241 to 250 of about 9,815,676 (278)
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Practical concentrators attaining maximal concentration
Optics Letters, 1980A new class of radiation concentrators is described that achieve maximal concentration of radiation from a uniform source. Unlike ideal concentrators, which accept all radiation within a given acceptance angle and none outside, the new maximal concentration collectors may reject some radiation from within the nominal acceptance angle.
E, Harting, D R, Mills, J E, Giutronich
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Concentrating the Concentrate: Solutions for Concentrate Management
IDA Journal of Desalination and Water Reuse, 2009AbstractCurrently, membrane technologies are restricted in most communities because of water recovery and concentrate disposal limitations. Lower water recoveries mean inefficient use of scarce resources, and concentrate disposal generally requires some form of treatment to meet safe discharge regulations.
Frederick Bloetscher +2 more
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Concentrating on Concentration
The Journal of Portfolio Management, 2004Factor models seek to reduce the impact of spurious in-sample correlations on the estimation of a covariance matrix of security returns. Among U.S. equities, market value is concentrated in a small number of assets both across the market and within industry sectors. Over 50% of market value, for example, is captured by 1% of assets.
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Concentration, Price, and Critical Concentration Ratios
The Review of Economics and Statistics, 1981A potentially important parameter that has not yet been convincingly estimated is the critical concentration ratio. This paper attempts to estimate it in three types of market. The estimation of a critical concentration ratio, if one exists, seems of potentially great importance because of its implication for antitrust policy.
Geithman, Frederick E +2 more
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Aggregate Concentration, Market Concentration and Diversification
The Economic Journal, 1983Studies of business concentration have traditionally focused on two alternative levels of aggregation. Overall, or aggregate, concentration is concerned with the extent to which the macro-economy (or broad sectors thereof) is dominated by the largest firms: this is commonly measured by the share of aggregate activity accounted for by the largest ioo ...
Clarke, R, Davies, S W
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Applied Optics, 1977
A novel class of geometric optical configurations for diffraction grating spectrographs is introduced. The concentric configurations offer appreciable advantages over traditional arrangements. Excellent image quality at high numerical aperture is demonstrated experimentally.
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A novel class of geometric optical configurations for diffraction grating spectrographs is introduced. The concentric configurations offer appreciable advantages over traditional arrangements. Excellent image quality at high numerical aperture is demonstrated experimentally.
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Predicting blood lead concentrations from environmental concentrations
Regulatory Toxicology and Pharmacology, 1992A method is presented by which blood lead concentrations can be estimated from environmental concentrations using a multipathway analysis. For the ingestion and dermal uptake pathways the incremental increase in blood lead concentration is estimated as the product of the concentration in the relevant medium, a medium-specific contact rate, and an ...
J C, Carlisle, M J, Wade
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