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A. N. Chumakov A. M. Petrenko N. A. Bosak 《Journal of Engineering Physics and Thermophysics》2003,76(4):847-853
The time shape and amplitude of pressure pulses initiated by surface laser air breakdown for different energies of laser pulses (1–180 mJ) has been compared to the results of numerical gasdynamic calculations of unsteady explosive motions with allowance for counterpressure at distances of 0.2 to 30 cm from the breakdown region. It has been established that the experimental pressure pulse has the character of slowly damped quasiperiodic vibrations, whereas the calculated pulse is a bipolar single pulse of a much shorter duration. Good agreement between the experimental and calculated amplitudes of a positive pressure phase has been found throughout the investigated range, whereas the agreement between the corresponding amplitudes and durations of a negative pressure phase is limited in character. The differences observed in the experimental and calculated data have been attributed to the transformation of the shockwave motion to acoustic radiation. 相似文献
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A study is made on the wettability of sodium chloride and oxygen-free ionic compounds fluorides of alkaline-earth elements (CaF, MgF, BaF) by molten metals. The metals Cu, Sn, Ag, Au, In, and Ga do not wet these materials ( 120-140 deg). The wettability of fluorides by aluminum is somewhat greater ( 90-100 deg), in accordance with the greater chemical affinity of aluminum for fluorine. Chemically highly active and aggressive alloys of Ti, Zr, Hf, and V (with concentrations up to 70-80%) which completely wet and destroy known refractory materials (oxide, nitride, carbide, and carbon refractories, etc.) behave anomalously in regard to fluorides they do not wet their surface and are inert when in contact with them. This is attributable to the formation of an intermediate gaseous phase (a volatile fluoride) which separates the liquid metal from the solid surface. Effective use can be made of this phenomenon to develop refractories (crucibles, containers, jackets, etc.) for use in the isothermal melting, homogenization, and casting of alloys that contain Ti, Zr, Hf, and V. 相似文献
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N. I. Venikov G. N. Golovanov V. P. Konyaev N. V. Starostin N. I. Chumakov 《Atomic Energy》1962,11(3):857-860
A method is described for accelerating He
3
2+
to 35 Mev in a cyclotron. A beam of 30 a with an energy spread of ± 0.3% was obtained on a target 12 m from the cyclotron. Due to the use of a gas recycling system, the loss of He3 was decreased by two orders and was approximately 5 cm3/hr.The authors wish to express their deep appreciation to N. A. Vlasov and S. P. Kalinin for the continuing interest in the project; to V. I. Lamunin and N. N. Khaldin for constructing the gas recycling system; to N. V. Kartashov for tuning the pulsed ion source; to the staffs of the operating group and machine shop who assisted in the preparation of the apparatus and cyclotron inlet system. 相似文献
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