29 research outputs found
Sintering Behavior and Dielectric Properties of Yttria/Silica-Coated BaTiO3 Material with Mn-Si-O Glass
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Double-quantum filtered heteronuclear correlation spectroscopy under magic angle spinning
No full textSteric Zipper of the Amyloid Fibrils Formed by Residues 109–122 of the Syrian Hamster Prion Protein
No full textMolecular Structure of Amyloid Fibrils Formed by Residues 127 to 147 of the Human Prion Protein
No full textSpectral editing based on selective excitation and Lee-Goldburg cross-polarization under magic angle spinning
No full textBenchmark Flight Scenarios for Testing Fault Tolerant Control of High Performance Aircraft
No full textThe Innovative Effector Concept (ICE) aircraft model is a high performance aircraft. The aircraft is over-actuated and a new control allocation algorithm has been designed previously to control this aircraft effectively: Incremental Nonlinear Control Allocation (INCA). It is unknown to what degree effector failures will affect the aircraft performance using this control algorithm. Hence, the main aim of this research is to investigate the performance of the over-actuated ICE aircraft model in presence of effector failures. New benchmark flight trajectories were defined for high performance aircraft performance testing. Autopilots were designed and tuned to automatically test all failure cases and manoeuvres. Tests of single effector failures for each flight condition and failure condition show the degradation in performance of the aircraft. Furthermore a sensitivity analysis was conducted to test the influence of aircraft state and starting conditions on the outcome of the performance for the most critical flight manoeuvre.Aerospace Engineering | Control & Simulatio
Modelling the impacts of in-field soil and irrigation variability on onion yield
Full text linkGlobally, onion (Allium cepa L.) represents an extremely important crop in terms
of production, value and consumption. Similarly, in the UK onion production is
considered to be one of the most important high-value field vegetables, with ca.
300,900 tonnes being produced from 8,448 ha (DEFRA 2010). However, a
great variability in onion productivity (yield) has been identified due to a
combination of environmental, genotypic, management and agronomic factors.
The increasing demand for high quality vegetables and their supply year round
is adding significant pressure on farming enterprises, which add to the
challenges UK onion producers already face (e.g. crop management, irrigation
and pest control decision-making).
The aim of this research was to assess the impacts of in-field soil and irrigation
variability on onion yield and quality. Therefore, the scientific evidence on the
relationships between onion yield, crop water use, irrigation and crop quality
were initially reviewed and the evidence corroborated with data from an industry
survey. In order to evaluate the effects of soils and irrigation variability on yield,
under different agroclimatic conditions, a crop growth model (AquaCrop) was
calibrated and then validated using experimental field data. The scientific
evidence in the literature and results from the industry survey were used to
validate and calibrate the AquaCrop model for brown onion (cv Arthur).
Statistical analyses were used to assess crop model goodness of fit. A series of
scenario were then defined and the AquaCrop model used to assess the
impacts of different onion cropping practices, production areas and typical and
extreme climatic conditions on crop yield.
The effects of irrigation non-uniformity (typical of a boom and linear move
irrigation application system) on production were assessed under a series of
agroclimatic conditions (five different years) and two contrasting soil types
(sandy and sandy loam). The simulations showed that the lowest yield (8.6 t
DM/ha) and greatest variability (standard deviation: 0.23 t DM/ha) occurred
under the driest agroclimatic conditions. Production on sandy soils resulted in
higher yield (in average 0.24t DM/ha) than on a sandy loam soil. The yield
under hosereels fitted with booms were statistically significant (Kruskal-Wallis
analysis) lower than for the linear move, although the difference was very small
(average of 9.52 t DM/ha vs. 9.56 t DM/ha). Under ‘average dry’ conditions, the
highest yield was produced on sandy soils (8.78 t DM/ha), contrary to ‘average’
agroclimatic conditions, where the highest yield was produced on sandy loam
soils (9.55 t DM/ha). For the driest season, the effects of irrigation variability
were only significant on sandy soils (8.80 t DM/ha and 8.73 t DM/ha for
hosereel fitted with linear move and boom, respectively). The study of uniform
versus non-uniform irrigation applications showed that onion yield was higher
under uniform irrigation. The differences between yields produced under
uniform and non-uniform irrigation increased with increasing climatic aridity
(0.01-0.18 t DM/ha compared to average values). Differences were greater in
cases of boom application systems. Onion yield generated by simulations of
uniform conditions fell within the range found in the literature. The variability
observed under non-uniform irrigation was the same (up to 30-40%) as the
overall variation reported by growers
Nutraceutical antioxidant potential and polyphenolic profiles of the Zambian market classes of bambara groundnuts (Vigna subterranea L. Verdc) and common beans (Phaseolus vulgaris L.)
No full textIncludes abstract.Includes bibliographical references.There is a growing interest in legumes and legume based foods because of the health claims associated with their consumption. The aim of the current study was to explore the nutraceutical potential of bambara groundnuts (Vigna subterranea L. Verdc) and common beans (Phaseolus vulgaris L.) commonly grown in Zambia based on the antioxidant properties and phenolic phytochemical profiles. Two market classes of bambara groundnuts (red and brown) and four of common beans (red, grey mottled, brown and white) were screened in raw dry form. Effects of cooking and sprouting on the antioxidant activities and phenolic phytochemicals of the promising market classes were assessed. The study employed in vitro antioxidant assays (DPPH and FRAP) to screen for antioxidant properties, HPLC-PDA-ESI-MS and Folin Ciocalteu assay to screen for phenolic phytochemical profiles
An interactive healthcare system with personalized diet and exercise guideline recommendation
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