45,287 research outputs found

    The Certainty of Confronting Uncertainty in the Chesapeake Bay Restoration Effort

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    Environmental Restoration, TMDL, Chesapeake Bay, Adaptive Management, Uncertainty, Environmental Economics and Policy, Resource /Energy Economics and Policy, Q00, Q01, Q20, Q28,

    What's Nature Done for You Lately: Measuring the Value of Ecosystem Services

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    ecosystem services, ecological production function, non-market valuation, public goods, Resource /Energy Economics and Policy, Q57, Q20, Q51, Q15,

    Ecosystem Services Beyond Valuation, Regulation and Philanthropy: Integrating Consumer Values into the Economy

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    Environmental Markets, Ecosystem Service Markets, Payment For Ecosystem Services, Incentives, Nature's Services, Resource /Energy Economics and Policy, Q20, Q57, C93, H41,

    Macro Economic Impacts of Installing Rice Husk Electricity Power Plants in Thailand

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    Macro economic impacts of rice-husk power plants (RHPP) in Thailand were analyzed by an Input/Output method. Results show that RHPP decreased sensitivity coefficients especially in the petroleum-sector, economic merits were realized in the agricultural-sector but total induced production effects were lowered, and induced imports by consumption were reduced with RHPP.I/O analysis, Sensitivity coefficient, Oil price, Biomass resource use, Crop Production/Industries, C67, O13, Q20, Q42, Q43,

    Heavy Flavour Physics at HERA

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    New results with increased statistics are presented for heavy flavour production at Q20. Cross sections for Dstar production, F2charm, the gluon density in the proton, and inelastic J/psi production are discussed and compared to theoretical calculations. A first measurement of the b anti-b cross section is reported.Comment: 11 pages, 11 figures, Contribution to `Workshop on Heavy Quarks at Fixed Target, October 199

    Changes in environmental tobacco smoke (ETS) exposure over a 20-year period: cross-sectional and longitudinal analyses

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    AIMS:  To examine long‐term changes in environmental tobacco smoke (ETS) exposure in British men between 1978 and 2000, using serum cotinine. DESIGN:  Prospective cohort: British Regional Heart Study. SETTING:  General practices in 24 towns in England, Wales and Scotland. PARTICIPANTS:  Non‐smoking men: 2125 studied at baseline [questionnaire (Q1): 1978–80, aged 40–59 years], 3046 studied 20 years later (Q20: 1998–2000, aged 60–79 years) and 1208 studied at both times. Non‐smokers were men reporting no current smoking with cotinine < 15 ng/ml at Q1 and/or Q20. MEASUREMENTS: Serum cotinine to assess ETS exposure. FINDINGS:  In cross‐sectional analysis, geometric mean cotinine level declined from 1.36 ng/ml [95% confidence interval (CI): 1.31, 1.42] at Q1 to 0.19 ng/ml (95% CI: 0.18, 0.19) at Q20. The prevalence of cotinine levels ≤ 0.7 ng/ml [associated with low coronary heart disease (CHD) risk] rose from 27.1% at Q1 to 83.3% at Q20. Manual social class and northern region of residence were associated with higher mean cotinine levels both at Q1 and Q20; older age was associated with lower cotinine level at Q20 only. Among 1208 persistent non‐smokers, cotinine fell by 1.47 ng/ml (95% CI: 1.37, 1.57), 86% decline. Absolute falls in cotinine were greater in manual occupational groups, in the Midlands and Scotland compared to southern England, although percentage decline was very similar across groups. CONCLUSIONS:  A marked decline in ETS exposure occurred in Britain between 1978 and 2000, which is likely to have reduced ETS‐related disease risks appreciably before the introduction of legislation banning smoking in public places

    Differential branching fraction and angular analysis of the decay B0→K∗0μ+μ−

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    The angular distribution and differential branching fraction of the decay B 0→ K ∗0 μ + μ − are studied using a data sample, collected by the LHCb experiment in pp collisions at s√=7 TeV, corresponding to an integrated luminosity of 1.0 fb−1. Several angular observables are measured in bins of the dimuon invariant mass squared, q 2. A first measurement of the zero-crossing point of the forward-backward asymmetry of the dimuon system is also presented. The zero-crossing point is measured to be q20=4.9±0.9GeV2/c4 , where the uncertainty is the sum of statistical and systematic uncertainties. The results are consistent with the Standard Model predictions

    Feasibility study of the flood protection measures in the locality of Maloměřice at the Svitava river at km 8,085 – 10,950

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    Tato diplomová práce se zabývá posouzením současného stavu povodňové ochrany s následným návrhem protipovodňových opatření v lokalitě Brno, městská část Maloměřice, na Svitavě v km 8,085 - 10,950. S použitím spřaženého 1D/2D numerického modelu proudění vody byly provedeny hydraulické výpočty průchodu kulminačních průtoků Q1, Q5, Q20 a Q100. Výstupy byly z pracovány v podobě map povodňového nebezpečí a výkresové dokumentace PPO.This master’s thesis deals with exploring present conditions in Maloměřice-Brno during floods which is followed by design of antiflood protective structures. Research uses coupled 1D/2D numerical model for flood discharges Q1, Q5, Q20 and Q100 computing. In the last step maps of hazard and draw documentation were made.

    AN AGENDA FOR THE STUDY OF LAND USE, WILDERNESS DESIGNATION, AND RESOURCE REGULATION IN THE AMERICAN WEST

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    Atemporal and intertemporal use of public lands, the determination of optimal levels of wilderness designation and habitat preservation, and the appropriate regulation of natural resources have all been "hot button" issues in the American West for quite some time now. In this paper, I propose and describe a research agenda which promises to yield interesting and useful new policy insights into these fractious resource issues.land use, wilderness, regulation, research, agenda, Land Economics/Use, Resource /Energy Economics and Policy, B41, Q20, Q25,

    On the Applicability of Weak-Coupling Results in High Density QCD

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    Quark matter at asymptotically high baryon chemical potential is in a color superconducting state characterized by a gap Delta. We demonstrate that although present weak-coupling calculations of Delta are formally correct for mu -> Infinity, the contributions which have to this point been neglected are large enough that present results can only be trusted for mu >> mu_c ~ 10^8 MeV. We make this argument by using the gauge dependence of the present calculation as a diagnostic tool. It is known that the present calculation yields a gauge invariant result for mu -> Infinity; we show, however, that the gauge dependence of this result only begins to decrease for mu > mu_c, and conclude that the result can certainly not be trusted for mu < mu_c. In an appendix, we set up the calculation of the influence of the Meissner effect on the magnitude of the gap. This contribution to Delta is, however, much smaller than the neglected contributions whose absence we detect via the resulting gauge dependence.Comment: 21 pages, 3 figures, uses LaTeX2e and ReVTeX, updated figures, made minor text change
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