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Gushing metal chain

Alexander BELYAEV,Alexander SUKHANOV,Alexander TSVETKOV

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1, Pages 95-100 doi: 10.1007/s11465-016-0377-y

Abstract:

This article addresses the problem in which a chain falls from a glass from some height. This phenomenon demonstrates a paradoxical rise of the chain over the glass. To explain this effect, an initial hypothesis and an appropriate theory are proposed for calculating the steady fall parameters of the chain. For this purpose, the modified Сayley ’s problem of falling chain given its rise due to the centrifugal force of upward inertia is solved. Results show that the lift caused by an increase in linear density at the part of chain where it is being bent (the upper part) is due to the convergence of the chain balls to one another. The experiments confirm the obtained estimates of the lifting chain.

Keywords： chain fountain Meshchersky equation Cayley’s problem

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Microwave－Optical Frequency Standards at NIM：Realizing of Definition of Metre and Second

Li Tianchun

Strategic Study of CAE 2007, Volume 9, Issue 6, Pages 27-31

Abstract: The paper presents the realization, at NIM, of SI time unit second using the NIM4 cesium fountainThe uncertainty of NIM4 fountain clock was evaluated as 5 × 10 ^{- 15}. The function, significance of Cs fountain clock, stabilized lasers, optical comb andFinally the progress of NIM5 fountain clock and the construction of a Sr atom optical clock started in

Keywords： metrology frequency standard stabilized laser Cs fountain clock FS optical comb