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Using first-principles method based on density functional theory, we have comparatively studied surface relaxation, surface energy, and electronic structure of the low-index surfaces (001), (110), and (111) of c-BN. The calculated surface energy indicated c-BN (110) was the most stable surface over the range of nitrogen chemical potential. It was consistent with the relaxation result that (110) surface...
For application in the magnetic field of joule balance at NIM, a dc-current source with 250mA for magnetic system, based on series compensation type, has been developed. Through designing the extraordinary sampling resistor, selecting stable voltage reference and operational amplifier with outstanding properties, the stability of this customized constant current source approached to 4.5×10−6/30min,...
Uricase-containing lipid vesicles (UOXLVs) were prepared by reverse-phase evaporation method with high efficiency and the characteristics of UOXLVs were described. The average size and zeta potential of UOXLVs obtained by the optimized formulation were 205.47nm and −37.33mV, respectively. Uricase was encapsulated in the alkaline aqueous phase of the lipid vesicle and the stability of its tetrameric...
This paper considers the problem of delay-distribution-dependent stability and stabilization for linear time delay system via dynamic output feedback control. The delay considered here is time-varying delay without any constraints on its derivative, which is assumed to be satisfying some stochastic characteristics. Corresponding to the probability of the delay taking value in different intervals,...
In this paper we give conditions that a discrete time switched linear systems must satisfy if it is stable. We do this by calculating the mean and covariance of the set of matrices obtained by using all possible switches. The theory of switched linear systems has received considerable attention in the systems theory literature in the last two decades. However, for discrete time switched systems the...
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