momentum transfer to plant canopies: influence of structure and variable drag

theory is developed to assess momentum transfer to vegetation canopies displaying a 'dynamic' response to variations in the level of mean wind-speed. with the assumption of an exponential variation of wind-speed with height in the upper layers of a plant canopy and the use of a wind-speed dependent drag coefficient c//d, theory is develop..

modeling the process of real contact area formation during friction interaction of fibrous masses with polymer counterbody surface

we study the process of formation of the real contact area (rca) of a fibrous mass (specifically cotton) with the surface of a polymer material on the basis of a model representation of the contacting bodies with account for their specific properties. we derive the analytic dependence of the relative real contact area on the basic factors..

micellar shape distribution in the isotropic phase near a prolate-to-oblate nematic phase transition

the cotton-mouton coefficient was measured as a function of temperature and concentration in the isotropic phase of the ternary system potassium laurate (kl), 1-decanol, and d//2o. based on a micellar picture of mixed rods and disks, and in the context of an entropy model for hard cylinders, the data indicate the relative fraction of rods..

heavy metals in cottontail rabbits on mined lands treated with sewage sludge

levels of heavy metals in soils, vegetation, and tissues of cottontail rabbits on a pennsylvania strip-mined site treated with sewage sludge were compared with those from a nontreated mine site to determine increases due to treatment effect. concentrations of cd, cu, and zn were higher in vegetation on the sludge-treated site. zinc was hi..

radiation crosslinked hydrogels as sustained release drug delivery systems

radiation methods have been used for: modification of vascular prostheses, obtaining burn dressing materials enabling controlled drug release, the preparation of polymer ocular insert disks. the surface of polyester vascular prostheses, has been modified by deposition of acrylamide and inducing its polymerization in the solid state by $ga..

antioxidant activity of models system products of maillard reaction on cotton seed oil

the reaction products of heated amino acids - glucose mixture, amino acids and b. h. t. were evaluated as an antioxidant on cotton seed oil stored at 50 $degree$ c for one month. peroxide, acid and iodine values of the oil were measured to determine the rate of oxidation during storage. all the three mentioned antioxidants exhibited consi..

production of biogas and biomanure from the textile-processing residue, willow-dust, by dry anaerobic fermentation

willow-dust is one of the solid cellulosic textile mill wastes available in large quantities. a batch fermentation method to process this material for the production of biogas and biomanure has been previously standardised. this process involves an initial aerobic fermentation of willow-dust treated with sodium hydroxide (1w/w) and inocul..

goodness of fit for eight water infiltration models

eight infiltration models were investigated for their capability to describe water infiltration into soils. the models were; philip's, modified philip's, kostiakov's, talsma and parlange's, horton's, and lewis and milne's. field measurements of water infiltration were made using single ring infiltrometers on field plots established on a n..

variables affecting the yields of fatty esters from transesterified vegetable oils

data are presented which demonstrate that transesterification reaction variables that affect yield and purity of the product esters from cottonseed, peanut, soybean and sunflower oils include molar ratio of alcohol to vegetable oil, type of catalyst (alkaline vs acidic), temperature and degree of refinement of the vegetable oil with alkal..

alternate harvesting systems and cotton quality

harvest methods were compared from 1981 to 1983 to determine if brush stripping would reduce fiber quality. averaged across tests, brush stripped seed cotton contained 27. 8 total trash compared to 4. 6 for spindle picked seed cotton. the brush stripper had mean fiber length that was 0. 4 mm shorter than spindle picked; 0. 9 more short fi..