Zobrazeno 1 - 10
of 67
pro vyhledávání: '"L. J. Clark"'
Publikováno v:
International Journal of Adhesion and Adhesives. 28:158-175
The aim of this study was to comprehensively review the traditional peel specimen for assessing adhesion of aircraft fuel tank sealants. A modified peel specimen was proposed that overcomes the inherent problems of the traditional test, which are ass
Publikováno v:
Journal of Applied Polymer Science. 108:3073-3091
The water and fuel absorption and desorption characteristics have been studied of aircraft fuel tank sealants. The sealants were an epoxy-cured polythioether and a MnO2-cured polysulphide. The effect of the water and fuel exposure on the glass transi
Publikováno v:
Journal of Adhesion Science and Technology. 22:1495-1522
The peel performance of two aircraft fuel tank sealants was comprehensively investigated by means of a modified peel specimen previously developed. Experiments were carried out at five different peel angles in the range from 90 to 180° using seven s
Autor:
P. K. Leech, L. J. Clark, W.A. Take, N. R. A. Bird, William R. Whalley, R. E. Cope, Chris W. Watts
Publikováno v:
European Journal of Soil Science. 58:18-25
The matric potential of soil water is probably the most useful assessment of soil water status. However, the water-filled tensiometer (the benchmark instrument for measuring matric potential) typically only operates in the range 0 to -85 kPa. In this
Autor:
L. J. Clark, Colin W. Gray, F Javier Lopez-Bellido, Fang-Jie Zhao, Steve P. McGrath, W. Richard Whalley
Publikováno v:
Science of The Total Environment. 372:433-439
Arsenic is a known human carcinogen, whereas Se is essential to human health and human Se intake in some European countries has decreased in recent decades. There have been few reports on the potential effect of soil physical conditions on the uptake
Publikováno v:
Soil Use and Management. 22:334-341
Despite a high energy requirement, the mouldboard plough remains the dominant tillage tool in northwest Europe. The aim of this work was to evaluate the relative influences of soil texture (clay content), soil organic carbon (SOC) and long-term manag
Publikováno v:
Plant and Soil. 280:65-76
The aim of this work was to examine the effect of mechanical impedance on nutrient acquisition and gene expression in rice (Oryza sativa L.). Roots were mechanically impeded in a sand-core apparatus to vary impedance independently of aeration and wat
Publikováno v:
Soil and Tillage Research. 84:18-27
One of the most important functions of soil is to provide an environment for root growth. Ideally, roots will elongate with minimal impedance and acquire water and nutrients so that crops may grow to their full potential. In practice, physical stress
Autor:
Darren M. Wells, P. B. Leeds-Harrison, L. J. Clark, Andrew P. Whitmore, William R. Whalley, R. M. Lark, David J. G. Gowing, Anthony J. Miller
Publikováno v:
The Journal of Agricultural Science. 143:347-358
The challenge that faces agriculture at the start of the 21st Century is to provide security of food production in a sustainable way. Achieving this task is difficult enough, but against a background of climate change, it becomes a moving target. How
Publikováno v:
Acta Agriculturae Scandinavica, Section B - Soil & Plant Science. 55:120-124
The restoration of the physical structure of soil by plant roots depends on the ability of roots to penetrate strong soil. The sensitivity of root growth to mechanical impedance can be considered as a possible screen for species suitable as ‘biolog