erosion simulation for land use management

a physically based model of water and sediment movement from a watershed, the sediment lab model, was combined with physiological model of cotton growth (gossym) to produce a model system that can be used to study the influence of management alternatives on water, sediment, and cotton yields from a cotton field. data from a cotton field i..

broadcast aerial release of an egg parasite for lepidopterous insect control

a conventional aircraft dispersal system was modified for broadcast release of parasitized insect eggs attached to wheat bran flakes. modifications to the conventional dry materials distribution system of a piper pa-25 agricultural aircraft equipped with a venturi-type spreader were minimal. they included: replacement of the gate-box agit..

effect of interliner on ignitability by radiant heat of one fabric/cushion combination

ignitability studies on one cotton fabric/polyurethane foam cushion combination, without and with polychloroprene interliner, indicated that the presence of interliner resulted in slightly shorter times to ignition, but the effect may be too small to be of practical significance. 2 refs

environmental deterioration of pvc: microbial attack

resistance to microbial attack, the destructive action of fungi and bacteria, is often ignored in the design of plastic materials many formulators consider polymers to be inert to the biological effects of environmental exposures. many workers have reported that synthetic polymers are not susceptible to microbial attack. however, there ar..

tinkabi tractor from swaziland

this article outlines technical and economic factors affecting the viability and production of a simple agricultural tractor for use in developing countries. the name tinkabi is derived from the siswati word for work-oxen. the tinkabi tractor offers a unique low-cost combination of simple design and easy handling features suited to the un..

das adsorptions- und desorptionsverhalten von distearyldimethylammoniumchlorid. $left bracket$ adsorption and desorption behavior of distearyldimethyl ammonium chloride $right bracket$

in the reported experiments, the adsorption behavior of dsdmac was examined under different conditions, using various kinds of fibers. hard water, elevated temperatures (40 $degree$ c) and prolonged post-treatment improve the absorption capacity. during a normal laundering process with boiling water, dsdmac is desorbed almost quantitative..

combining in-circuit and functional testing

in-circuit testers, originally conceived to test for and isolate manufacturing defects and assembly faults on loaded p/c boards, are now incorporating test capabilities formerly assigned to functional testers. the latest systems, in addition to testing for shorts, opens, and components that are missing, wrong, backward, defective or out o..

limitations in automated pc board processing

the continuing trend toward automated production techniques has infiltrated p/c board processing operations. but this automation has generally been limited to individual processes rather than applied to combined in-line processes. the reasons for this limitation include high development costs and the requirement to standardize on a specif..

flame-retardant polymeric materials, volume 2, 1978

this book contains nine chapters covering natural and synthetic polymers in regard to their flammability and fireproofing by means of flame retardants. main topics discussed are: structure, pyrolysis, and flammability of cellulose; synergism and flame retardancy; ignition of polymers; phosphorus-based flame retardants; flammability of cot..

effects of weathering and atmospheric pollutants on cotton fabric and cotton fabric treated with selected flame retardants $em dash$ 1. physical, chemical, and flammability properties

in the reported experiments, the effects of weathering and atmospheric pollutants on the physical, chemical, and flammability properties of cotton fabirc treated with pyrovatex 3805 and with thpoh-nh//3 flame retardant finishes and untreated controls were determined. the fabrics were exposed to so//2, no//2, and ozone singly and in combin..