action of a new material on storage of single base propellant

for safety purposes during the storage of single-base propellant it is important to study all factors which will act on its components during this period. this study is oriented more toward changing the nature of the raw material. thermal decomposition reactions and the application of berthelot's law served to determine the storage period..

role of mass trapping of the egyptian cotton leafworm (spodoptera littoralis boisd) in its integrated pest control

mass trapping of the egyptian cotton leafworm (spodoptera littoralis) with its sex pheromone for four consecutive years (1976-1979) has resulted in a 20-45 reduction in treatments against the pest, together with reduction in the number of egg clusters and egg viability in treated fields as compared to control, on vast areas, of thousands ..

degradation of viscose fibres in the finishing process and in service

the change in degree of polymerization, loss in weight, and buildup of carbonyl and carboxyl groups have been investigated in boiling, bleaching, and washing ordinary viscose fiber, siblon high-modulus fiber, and cotton. it has been found that siblon high-modulus viscose fiber is preferable for blends with cotton with respect to resistanc..

effect of potassium superoxide on cellulose

cotton staple was reacted with potassium superoxide in dimethylsulfoxide at room temperature. the primary wall was perforated, the bonding between fibrillar components was weakened, and the degree of polymerization (dp) was decreased from 6700 to about 300. this resistant dp was similar to that reported in the literature for the limit dp ..

trzecia generacja insektycydow. $left bracket$ third generation of insecticides $right bracket$

recently new compounds from group of synthetic pyrethroides, named as third generation of insecticides, have been developed for chemical protection of plants. short description of the compounds properties is given. their advantages are high efficiency, fast biodegradation, low toxicity for homeothermal organisms and much smaller doses bei..

investigation of the structural properties of nitrates based on cellulose from flax shive by the method of spin markers

investigations for cellulose from flax shive, which, according to its origin, should exhibit certain properties of both cotton and wood cellulose were carried out. we employed an effective and highly sensitive method for investigating the molecular dynamics - the method of spin markers. this method has the advantage that it is possible to..

spectral components analysis. rationale, and results for three crops

the rationale includes the concepts that vegetation indices adequately measure the amount of photosynthetically active tissue in plant canopies and that high yields cannot be achieved unless growing conditions permit canopies to develop that effectively intercept the available light during reproduction. for wheat, cotton and maize the coe..

prediction of within-row plant spacing distributions in cotton at selected population densities

spacings of cotton plants along a row were found to follow an exponential distribution at plant population densities of 104,000 and 179,000 plants/ha. this fact permits the simulation of cotton plant positions, a potential benefit for modeling the effects of thinning on plant population density and uniformity. (author abstract) 5 refs

low-frequency admittance measurements on the hgcdte/photox sio//2 interface

the complex admittance of an n-type hg//1// $minus$ //xcd//xte/photox sio//2 interface with x $equals$ 0. 3 has been examined for frequencies ranging between 1 mhz and 4 mhz. the conductance method is used to decompose the total interface state density into three types of components: a valence-band tail, a conduction-band tail, and some w..

determining transpiration from meteorological data and crop characteristics for irrigation management

the performance of a transpiration model was tested and adapted to suit the operational requirements of automated irrigation systems hourly measurements of global solar radiation, air temperature, humidity and wind speed, obtained from an automatic weather station are inputs to the model. additional inputs include daily updated data of pl..