No abstract available

[en] The use of empirical models for On-Line Monitoring (OLM) of safety critical instrumentation for calibration reduction has been investigated for over a decade. To help support the regulatory review of possible license amendments, a series of three NUREG/CRs are being developed, The first volume in this series, entitled NUREG/CR-6895 'Technical Review of On-line Monitoring Techniques for Performance Assessment Volume I: State-of-the-Art', offers a general overview of current sensor calibration monitoring technologies and their uncertainty analysis, a review of the supporting information necessary for assessing these techniques, and a cross reference between the literature and the requirements previously outlined by the NRC. Volume II, 'Theoretical Issues', presents an in-depth theoretical study and independent review of the most widely used OLM techniques. It includes a presentation of the theory and further explanation of the assumptions inherent in empirical models and uncertainty quantification techniques. The third and final volume; 'Limiting Case Studies', presents the results of applying OLM models to a wide variety of plant data. Specifically, Volume III summarizes six case studies investigating the effects of model development and assumptions on model performance and offers recommendations for identifying and handling these limiting cases. This paper discusses the six cases studies. Although this study is not an exhaustive review of the many issues in OLM system development, it provides a base set of considerations which must be accounted for and a method for testing these considerations with other model architectures. (authors)

[en] The world's climate is rapidly changing, which is leading to extreme weather events. A major cause of these extreme weather events is the rising temperature in the Earth's atmosphere, driven by increasing emission of greenhouse gases (GHGs) such as carbon dioxide, methane and nitrous oxide. Climate change (e.g. higher atmospheric CO₂ concentrations, higher air temperatures and varying precipitation patterns) alters the conditions under which crops are growing and will have severe impacts on crop yields, food quality and food security (Högy et al., 2009; Andresen et al., 2018; Augustine et al., 2018). The most realistic research approaches are facilities that operate under natural conditions to simulate expected climatic changes on agricultural systems. If only the factor CO₂ is investigated, we talk about Free Air CO₂ Enrichment (FACE) Experiments, which simulate the effect of future atmospheric CO₂ concentrations on crops in the field to investigate the effects on ecosystem organisms and processes (Hendrey and Kimball, 1994).

[en] A fresh analysis is reported of high statistics Crystal Barrel data on pp →3π⁰, ηηπ⁰, ηπ⁰ π⁰ and ηη'π⁰ at rest. This analysis is made fully consistent with CERN-Munich data on π⁺π^- →π⁺π^- up to a mass of 1900 MeV, with GAMS data on π⁺π^- →π⁰ π⁰, and with BNL and ANL data on π⁺π^-→KK, which are fitted simultaneously. There is evidence for an I = 0, J^PC = 2⁺⁺ resonance with weak (≤7%) coupling to ππ, strong coupling to both ρρ and ωω and pole position 1534 - i90 MeV. This resonance agrees qualitatively with GAMS and VES data on ππ→ωω, previously interpreted in terms of a resonance at 1590-1640 MeV. New masses and widths for (A) f₀(1370) and (B) f₀(1500), fitted to all eight data sets, are M_A = 1300 ±15 MeV, Γ_A= 230 ±15 MeV, M_B = 1500 ±8 MeV, Γ_B = 132 ±15 MeV. Branching ratios to ππ and ηη are given, and differ significantly from earlier determinations because of a new procedure. (orig.)

[en] We present a measurement and partial wave analysis of the final state K_LK^±π^minus-plus of bar pp annihilation at rest in liquid hydrogen. This reaction is important for the study of the bar KK decay mode of scalar resonances, in particular, the isovectors a₀(980) and a₀(1450). The determination of the a₀(1450) production also fixes the bar KK coupling of the isoscalar f₀(1500) which is discussed as a glueball. We find B(bar pp→a₀(1450)π;a₀(1450)→ bar KK)=(8.88±1.68)x10^-4 and hence B(bar pp→f₀(1500)π;f₀(1500)→ bar KK)=(4.52±0.36)x10^-4. The mass and width of a₀(1450) are m=1480±30MeV/c² and Γ=265±15MeV/c², respectively. For a₀(980) we determine the relative ratio B(bar pp→a₀π;a₀→ bar KK)/B(bar pp→a₀π;a₀→πη) =0.23±0.05 and its relative coupling, bar KK to πη, is 1.03±0.14. copyright 1998 The American Physical Society