Conductivity of C60 fullerene crystals under dynamic compression up to 200 kbar

The conductivity σ of C₆₀ fullerene crystals is measured under quasi-isentropic loading by a spread shock wave to a pressure of 200 kbar at the initial temperatures 293 and 77 K. A sharp increase in σ by seven to eight orders of magnitude is detected: from 10^?6?10^?7 Ω^?1 cm^?1 at normal conditions to 5 Ω^?1 cm^?1 under pressure from 100 to 200 kbar. The conductivity of samples under pressure decreases with decreasing temperature, which is characteristic of semiconductors. On pressure release, σ regains its initial value.     

绝缘栅双极晶体管固体开关技术研究

 采用二只1.2kV,75A的绝缘栅双极晶体管（IGBT）串联，对用于加速器的IGBT固体开关技术进行了研究；通过采取动态电压和静态电压平衡措施来解决IGBT串联中的瞬态电压平衡问题。在不同工作条件下，串联IGBT开关工作性能稳定，重复性好。在纯阻性负载上得到了上升时间约300ns、下降时间约164μs、峰值电压1.8kV的输出。     

Structural defects in molecular crystals based on heterospin copper complexes

Jumplike changes in the microhardness, sample dimensions, and parameters of the EPR spectrum were observed in molecular Cu(hfac)₂L^Et crystals undergoing a phase transition. Defects that appear upon plastic deformation (e.g., dislocations) and paramagnetic defects were revealed. The latter defects are likely breaks in polymer chains and can serve as spin marks for investigating the magnetic state of the crystal lattice.     

Scattering of relativistic electrons by high-power laser light tightly focused

We obtain an approximate solution for the drift and oscillatory components of the motion of relativistic electrons in the field of temporally extended high-power laser light under strong focusing of the light (the size of the focal region is of the order of the light wavelength). This makes it possible to start numerically integrating the equations of electron motion near the focal region. We estimate the impact parameters of the electrons when they are still efficiently accelerated in the focal region. Zh. éksp. Teor. Fiz. 111, 1554–1562 (May 1997)     

在有向网络中寻找最小支撑入树的计算方法

本文研究了有向网络中支撑入树的性质 ,提出了在有向网络图中寻找以某一指定点为根的最小支撑入树的一种较简便的算法 ,并给出了应用该算法的一个实际算例     

The role played by self-inhibition in combustion processes

The absence of correlations between the heat of combustion of substances and substance combustion characteristics is shown to be caused by the special features of competition between reaction chain branching and termination, including partial participation of fuels in the inhibition of their oxidation. By way of example, differences in the characteristics of combustion of hydrocarbons and hydrogen at atmospheric pressure and the mechanisms of the development of chain avalanches in these processes are considered.     

Instability and disruption of precision cumulation of cavities and mass flows in the field of gravitational and inertial forces and other dipole perturbations

The effect of gravitational and inertial forces on the precision cumulation of cavities, fast mass flows, and detonation and shock waves is studied in stages. The possible effects of these forces on the motion of masses and waves (the velocity, direction and structure of the waves can change) and on the properties of the medium in front of the waves that influence the change in the parameters and refraction of the waves are noted. It is shown that it is advantageous to perform precision cumulation experiments in zero-gravity. Zh. éksp. Teor. Fiz. 111, 2001–2015 (June 1997)     

Various methods of reconstruction of a cavity in an orthotropic layer

Direct and inverse problems of oscillations of an anisotropic layer with a cylindrical cavity of an arbitrary cross-sectional shape under the action of a load applied to the layer surface are considered. An asymptotic approach to solving these problems with cavities of small relative sizes is proposed. Numerical results of solving direct and inverse problems are presented. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 50, No. 3, pp. 181–189, May–June, 2009.     

Investigation of the turbulent mixing of thin layers of materials of different density during the laser acceleration of flat multilayer targets in the Iskra-4 facility

The results of the first experiments devised to investigate the mixing of thin layers of Al and Au during the laser acceleration of flat three-layer targets of Si (5 μm), Al (2 μm), and Au (0.05–0.26 μm) by radiation converted to the second harmonic from the Iskra-4 iodine laser with an intensity of 4×10¹³−7×10¹³ W/cm² (τ _0.5∼1 ns), which acts on the Si side of the target. A method for detecting the occurrence of mixing is developed. It is established that under the experimental conditions the thickness of the mixing region is at least ∼0.15 μm. The results of a theoretical analysis of the evolution of the disturbances leading to mixing are presented. Zh. éksp. Teor. Fiz. 111, 882–888 (March 1997) Deceased.     

Channels in rotating liquids for conducting discharges, transporting currents and particle and radiation fluxes, and lowering breakdown thresholds

The formation of gas channels in rotating liquids is investigated and the application of such channels as capillaries for high-power discharges in x-ray lasers, for transporting particle and radiation fluxes, and lowering breakdown thresholds (including with the use of metal fillings), for structural systems for microwave generation and particle acceleration, and for photochemical and shock action on a liquid, and so on, is discussed. It is noted that tubular active elements and samples can be fabricated by solidification and crystallization during rotation. Pis’ma Zh. éksp. Teor. Fiz. 65, No. 3, 291–294 (10 February 1997)