Heterogeneous transesterification of vegetable oils offers an environmentally more attractive option for biodiesel production compared to the conventional homogeneous processes. In the work, a novel heterogeneous base catalyst was prepared by anchoring 1,3-dicyclohexyl-2-octylguanidine (DCOD)...

This article offers an overview of the development of dairy cow breeding in China, and analyzes the problems in the development of dairy cow breeding in China as follows: the breeding scale is small; the pasture grass production cannot meet demand; the proportion of fine breed is not high and the...

The composite La–Ni–Al/Ni–S alloy film was obtained by molten salt electrolysis and aquatic electrodeposition in turn. The La–Ni–Al alloy film was prepared in Na3AlF6–La2O3–Al2O3 molten salt electrolyte by galvanostatic electrolysis at 100 mA cm−2. The results showed that La3+...

Let X1, X2,...,Xn be a time-homogeneous {0, 1}-valued Markov chain. Let Y = (Y1,...,Yr) denote the r-dimensional random vector, where Yi(i = l,...,r) represents the number of success runs of length ki(i = 1,...,r), k = (kl,...,kr). In this paper we obtain exact and recurrence formulae for the...

The cycle frosting and defrosting performance of two types of microchannel heat exchangers were investigated. All the processes were observed using a CCD camera to better understand the cycle frost mechanism. Ice blockage formed in the fin root gaps of the horizontal-tube sample because of water...

Given sequences of finite-state trials, an almost perfect match means that there exists at least k-1 matches between any subsequences of size k in each sequence. Let X1,X2,... be a sequence of {0,1}-valued Markov dependent random variables each resulting in either a match (Xi=1) or mismatch...

Previous research on online consumer purchases has focused on increased purchases and neglected decreased purchases. However, factors impacting these purchases are different. Drawing on the two-factor theory, in this paper, the authors compare factors affecting increase and decrease in Chinese...