Peter Gregory

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A quantitative model of wheat root systems is developed that links the size and distribution of the root system to the capture of water and nitrogen (which are assumed to be evenly distributed with depth) during grain filling, and allows estimates of the economic consequences of this capture to be assessed. A particular feature of the model is its use of(More)
BACKGROUND Homeless families are an increasing but marginalised part of society. They have diverse and complex needs that have often not been addressed by the available services. There is some evidence that psychosocial factors continue to be detrimental to the mental health of these families even after rehousing. METHOD Thirty-five homeless families were(More)
Considerable effort has been spent extending the scope of planning beyond propositional domains to include, for example, time and numbers. Each extension has been designed as a separate specific semantic enrichment of the underlying planning model, with its own syntax and customised integration into a planning algorithm. Inspired by work on SAT Modulo(More)
Work by Kilby, Slaney, Thiebaux andWalsh [1] showed that the backdoors and backbones of unstructured Random 3SAT instances are largely disjoint. In this work we extend this study to the consideration of backdoors in SAT encodings of structured problems. We show that the results of Kilby et al. also apply to structured problems. Further, we analyse the(More)
Levels of total glycoalkaloids (TGA) in foliage of 10 wild, tuberbearingSolanum (Tourn.) L. species differentially resistant to infestation by the potato leafhopper,Empoasca fabae (Harris), were determined. Levels of TGA ranged from a high of 688 mg/100 g fresh wt. in a resistant species,S. polyadenium Greenm. to a low of 13 mg/100 g fresh wt. in a(More)
One approach to optimal planning is to first start with a suboptimal solution as a seed plan, and then iteratively search for shorter plans. This approach inevitably leads to an increase in the size of the model to be solved. We introduce a reformulation of the planning problem in which the problem is described as a metaCSP, which controls the search of an(More)
PURPOSE To assess the efficacy of a 1-off electrostimulation treatment as a recovery modality from acute team-sport exercise, directly comparing the benefits to contrast water therapy. METHODS Ten moderately trained male athletes completed a simulated team-game circuit (STGC). At the conclusion of exercise, participants then completed a 30-min recovery(More)