applicability of the four-probe technique under extremely variable water contents and salinity distribution

a drip-irrigated cotton field was used to test the applicability of the four-probe technique for measuring the salinity of the soil solution. the formation factor (f), which relates measured bulk soil electrical conductivity (ec//a) to calculated salinity (ec//w), is highly dependent on soil water content. good results were obtained even ..

reconstituted nitrocellulose with significant molecular alignment

nitrocellulose (nc) typically consists of bent fibers which are no more than a couple of millimeters long, and which are practically impossible to straighten out and align. there is much to be gained, therefore, by dissolving nc and then attempting to reconstitute it in the form of aligned fibers. this would allow nitrated cotton linters ..

association of nitrocellulose with cupric chloride in solution

the cupric chloride (cc) effect on the viscosity of nitrocellulose (nc) in acetone solution was studied for various wood and cotton nitrocellulose samples with different nitrogen content and molecular weights. the addition of cc to nc solution causes an increase of the viscosity as a function of time due to complex formation between nc an..

nondegradative preparation of amorphous cellulose

amorphous (noncrystalline) cellulose was prepared by dissolving cotton hydrocellulose in the dimethylsulfoxide-paraformaldehyde solvent system and regenerating the cellulose by slow addition of the resultant methylol cellulose solution to stirred 0. 2m sodium alkoxide in methanol:2-propanol (1:1 vol. ). the regeneration celluloses, essent..

flow of vegetable oil-pesticide blank-formulation mixtures through agricultural spray nozzles

properties of specific gravity, viscosity and flow rate were measured for cottonseed and soybean oil mixed with selected blank pesticide formulations without the active ingredient, i. e. , blank-formulations. fluid temperature ranged from 5 to 70 c for the measurements. specific gravity of soybean oil mixtures was found to vary approximat..

sorption properties of phosphorylated cellulose

the use of polyphosphoric acids for modifying cellulose facilitates the solution of many synthesis problems and leads to production of materials having various new physicochemical properties. despite the importance of the problem of interaction of phosphorus-containing polymers with various sorbates, there are virtually no reports in the ..

fractionation and utilization of gossypol resin

this work is concerned with fractionation of gossypol resin and utilization of its fractions for various purposes. the possibility of fractionation of gossypol resin is demonstrated and the fields of application of this readily available secondary waste product and its individual fractions in the national economy have been indicated; the ..

protein enrichment of rice straw by fermentation with cellulomonas sp

protein enrichment of rice straw was attempted by subjecting it to fermentation with a strain of cellulomonas (cbs. 7) which was originally isolated from decomposing cotton debris. maximum cellulose utilisation (73. 2) was recorded with ammonium sulphate as nitrogen source supplemented with biotin, at ph 7. 5 within 72 h of fermentation. ..

video digitization of aerial photographs for measurement of wind erosion damage on converted rangeland

this project developed a practical approach for measuring the area of wind erosion damage on rangeland converted to farmland. the selected study area consisted of 7,150 ha that was rangeland before 1954. a video graphics microcomputer system enhanced and digitized aerial photographs to measure the area of wind erosion or blowouts and the ..

side chain mesomorphic polymers: studies of labelled backbones by neutron scattering

side chain liquid crystal polymers are studied in the isotropic, nematic and smectic phases. the samples are made from a mixture of liquid crystal polymethacrylate with deuterated or protonated backbones. the samples are studied with neutron diffraction and small angle neutron scattering. the results show in particular that in the aligned..