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A study is made of the relationship between the deformation and strength characteristics of needle-punched materials made
from a mix of polyester and bicomponent fibers and treated with heated air. This type of treatment is very effective for obtaining
materials with good initial tensile strength. However, the material’s resistance to deformation is preserved with relatively
little elongation. Its strength increases only in the transverse direction. 相似文献
4.
D. Yu. Marchenko S. I. Petrov D. A. Sandzhieva A. G. Dedov 《Theoretical Foundations of Chemical Engineering》2016,50(4):648-654
The possibilities of using new reagent compositions based on diazo and azo dyestuff components that contain sulfonic groups are considered to determine nitrites in the presence of the contents of chlorides. New reagent compositions based on 1-hydroxynaphthalene-3,6-disulfonic acid in combination with 2,6- nitroorthanilic and 2,6-dichlorosulfanilic acids have been used to create indicator powders and indicator papers for the quantitative test determination of nitrite ions. Test methods based on sustainable indicator powders and indicator papers have been developed with the use of the ilPro portable spectrophotometer and PlustekSmartPhoto P60 compact mobile scanner combined with the Vuescan universal scan program. It has been shown that the sensitivity of the visual determination of nitrites in liquids using indicator papers is 0.5 mg/L. The sensitivity of the test method that uses indicator papers, the PlustekSmartPhoto P60 mobile scanner, and the ilPro portable spectrophotometer is 0.2 mg/L. Upon using the indicator powder and i1Pro portable spectrophotometer, the range of defined concentrations of nitrite ions is 0.01–5 mg/L. 相似文献
5.
A. G. Dedov A. S. Loktev E. A. Katsman M. V. Tsodikov A. V. Chistyakov A. E. Gekhman E. A. Isaeva I. I. Moiseev 《Petroleum Chemistry》2016,56(7):591-598
An approach to the construction of a kinetic model for the reactions of rapeseed oil hydroconversion to aromatic hydrocarbons has been proposed, which is based on analysis of experimental data obtained using a MFI zeolite promoted with zinc and chromium ions. An empirical mathematical model describing the dynamic behavior of the main products of the decomposition reaction of rapeseed oil as a model feedstock has been developed. It has been shown that an increase in the space time and temperature in the examined range of reaction conditions increase the yield of aromatic hydrocarbons. The influence of hydrogen pressure on the yield of aromatics is nonmonotonic in character, passing through a maximum, with the optimum yield being in the middle of the hydrogen pressure range of 10–20 atm. 相似文献
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V. P. Dedov B. P. Filimonov Yu. V. Ryzhkin A. R. Sheikin 《Measurement Techniques》1999,42(10):930-941
A quantitative analysis was made of 13 experiments carried out at different times with the aim of determining the Newtonian
gravitational constant G. Traces of a gravitational screening effect were found to be present in experiments to determine
G. There was no quantitative error in the experiment of Majorana. One of the major reasons for the low accuracy of determinations
of the gravitational constant is the failure to take account of the influence of the Earth on such experiments. An approximate
expression is given for the screening function of the Earth. A prediction has been made of values of G for a new experiment
whose preparation is nearing completion in Switzerland.
Deceased.
Translated from Izmeritel'naya Tekhnika, No. 10, pp. 17–23, October, 1999. 相似文献
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It is shown that the experiments of Allais and Long and other gravimetric experiments contained signals of a nongravitational
nature which the authors failed to take into account.
Translated from Izmeritel'naya Tekhnika, No. 1, pp. 3–8, January, 1997. 相似文献
10.
The pore structure of heat-treated nonwoven materials is determined by the conditions of heating and cooling them. The effect
of the shrinkage properties of a bicomponent fibre on the pore structure of the materials is manifested at a treatment temperature
above the melting point of polypropylene.
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Translated from Khimicheskie Volokna, No. 3, pp. 41–43, May–June, 2005. 相似文献