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The stability of direct methods for second-order systems is examined. The methods, suggested by Krogh, are generalized BDF methods. The Michael Kors Online Outlet Store Canada control of stepsize to ensure stability is examined and criteria for deciding when to switch between methods are discussed. As a result of the investigation of the expansion of freezing aggregate in a free state and in the resin matrix a two-phase character of its deformability is confirmed. The author presents his own conception of the destructive mechanism of frost action in concrete aggregate. This mechanism is primarily due to water crystallization. The model of electrical degradation describes the observed growth of damage in polymers quantitatively. It is shown that the fractal approach can be used to explain the non-monotonic behaviour of voltage versus scale for electrical degradation. Utilizing the high-power, radially polarized CO2 laser and high-quality electron beam at the Brookhaven Accelerator Test Facility, a vacuum laser acceleration scheme is proposed. In this scheme, optics configuration is simple, a small focused beam spot size can be easily maintained, and optical damage becomes less important. At least Michael Kors Tote Bag Canada 0.5 GeV/m acceleration gradient is achievable by 1 TW laser power.