21 research outputs found

    A set of canonical problems in sloshing. Part 0: Experimental setup and data processing

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    In a series of attempts to research and document relevant sloshing type phenomena, a series of experiments have been conducted. The aim of this paper is to describe the setup and data processing of such experiments. A sloshing tank is subjected to angular motion. As a result pressure registers are obtained at several locations, together with the motion data, torque and a collection of image and video information. The experimental rig and the data acquisition systems are described. Useful information for experimental sloshing research practitioners is provided. This information is related to the liquids used in the experiments, the dying techniques, tank building processes, synchronization of acquisition systems, etc. A new procedure for reconstructing experimental data, that takes into account experimental uncertainties, is presented. This procedure is based on a least squares spline approximation of the data. Based on a deterministic approach to the first sloshing wave impact event in a sloshing experiment, an uncertainty analysis procedure of the associated first pressure peak value is described

    Two-Timescale Discretization Scheme for Collocation

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    Enhancing plant growth, seed yield and sterol content through manipulation of 3-hydroxy-3-methylglutaryl coenzyme A synthase

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    Poster Session - Biosynthesis: Early Steps and Isoprene Formation: no. P.027Due to the importance of plant isoprenoids, several attempts had been made to achieve some overproduction. Rate-limiting reactions in the MVA pathway like that catalyzed by HMG-CoA reductase were initially considered, also of enzymes downstream. In previous work we had studied the role and kinetics of the second enzyme in the MVA pathway, HMG-CoA synthase in Brassica juncea (BjHMGS1), including the effect of targeted mutation of several amino acid residues and could generate an enzyme with higher catalytic efficiency in vitro. WT BjHMGS1 and BjHMGS1S393A were transformed into Arabidopsis, resulting in positive effects such as an increased resistance to stress. This has been extended to tobacco over-expressing wild-type (OE-wtBjHMGS1) and mutant BjHMGSS359A (OE-S359A), which resulted in higher accumulation of total phytosterols than in the vector-transformed control, with OE-S359A showing some higher sterol increase than OE-wtBjHMGS1. The over-expression of HMGS up-regulated several downstream genes in the isoprenoid pathway and was found to accelerate and promote plant growth, leading to a higher yield of seeds, which both are interesting agricultural traits. The role of HMGSfor plant growth is supported by the existence of natural inhibitors like F-244, efficiently retarding growth of B juncea seedlings and tobacco BY 2 cells

    Impact of Space Shuttle Orbiter Re-Entry on Mesospheric NO

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