No abstract

MuItiple-contact stacks of plates either sprayed with manganese dioxide or perforated have better thermal characteristics than stacks of solid "pure" plates. Under vibrating loads, however, the insulating characteristics of the former and the mechanical strength of the latter are degraded. ~rthermore, the manufacturing cost of either ty-pe of stack is quite high [t]. COS(p b2k_ t = (4k -1)/P~k_l(i sh~/0) P2k-l(t) r + sh~ ~0 dr;P2k-i(~) are Legendre polynomials.Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar'kov.