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1.
Summary Optically pure (+)-beta-eudesmol is a possible starting material for the synthesis of several termite defense compounds. A
two step procedure for the isolation of gram quantities of (+)-beta-eudesmol from commercially availableAmyris balsamifera oil (syn. West Indian sandalwood oil), containing 8% beta-eudesmol, was developed. Step one consisted of an efficient vacuum
distillation of the total oil. Step two was a medium pressure LC separation with an AgNO3 impregnated silica gel stationary phase. Several other separation procedures failed due to the presence of many closely related
sesquiterpene alcohols (75% of the oil). 相似文献
2.
3.
The processes of breaking, solution, and formation of hydrates behind a shock wave of moderate amplitude were studied experimentally
in water with carbon dioxide bubbles under different initial static pressures. It is shown that an increase in the static
pressure in a gas-liquid medium leads to reduction of critical relative amplitude of the shock wave, corresponding to starting
development of Kelvin — Helmholtz instability and bubble splitting into small gas inclusions behind the shock wave front.
It is shown that the rates of carbon dioxide solution and hydrate formation behind the shock wave front are close by the value;
their dependences on medium and wave parameters are determined. Calculations by the model of gas hydration behind the shock
wave are presented.
The work was financially supported by the Russian Foundation for Basic Research (grants Nos. 06-01-00142 and 06-08-00657). 相似文献
4.
5.
V. E. Dontsov 《Journal of Applied Mechanics and Technical Physics》2005,46(3):346-354
Propagation of a stepwise shock wave in a liquid containing spherical gas-liquid clusters is experimentally studied. Measured
results are compared with available theoretical models. It is shown that resonant interaction of gas-liquid clusters in the
wave can increase the amplitude of oscillations in the shock wave.
__________
Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 3, pp. 50–60, May–June, 2005. 相似文献
6.
7.
V. E. Dontsov V. E. Nakoryakov B. G. Pokusaev 《Journal of Applied Mechanics and Technical Physics》1995,36(1):30-37
Novosibirsk. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 1, pp. 32–40, January–February, 1995. 相似文献
8.
9.
V. M. Ievlev K. A. Solntsev A. I. Dontsov A. A. Maksimenko S. V. Kannykin 《Technical Physics》2016,61(3):467-469
The hydrogen permeability of thin (about 4 μm thick) magnetron-sputtered Pd–Cu foil and structural transformations during temperature cycling (heating–cooling process) are studied. It is found that the hydrogen permeability is maximal when the content of the β-phase is 100%. Upon annealing of Pd–Cu alloy in hydrogen, the temperature range where a regular structure exists expands. 相似文献
10.
V. E. Dontsov V. E. Nakoryakov 《Journal of Applied Mechanics and Technical Physics》2000,41(5):845-854
The process of evolution and reflection of shock waves of moderate amplitude from a rigid boundary in a porous medium saturated
by a liquid with bubbles of a soluble gas is studied experimentally. Experimental values of the amplitude and velocity of
the reflected wave are compared with the calculated results obtained using mathematical models. The process of dissolution
of gas bubbles in the liquid behind the shock wave is studied.
Kutateladze Institute of Thermal Physics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 5, pp. 91–102, September–October, 2000. 相似文献