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The findings suggest that hands-on training remains safe and effective even when not implemented in centralized training centres. Further refinement of the training protocol, providing postoperative refractive services and more accurate preoperative intraocular lens calculations, can help optimize outcomes.

This work presents optimal sampling schemes for forest inventory. The sampling procedures are optimal in the sense that they minimize the anticipated variance for given costs or conversely, the anticipated variance is the average of the design-based variance under a local Poisson model for the spatial distribution of the trees. The resulting optimal inclusion rules are either probability proportional to size, in one-stage procedures, or a combination of probability proportional to prediction and probability proportional to error, in two-stage procedures. Best feasible approximations of the exact optimal sampling schemes are also given.

This paper proposes a blockchain-based solution for housing rental system to achieve peer-to-peer sharing of listings information in an intermediary-free manner. The new solution programmatically converts traditional lease agreements into smart lease contracts, improve the efficiency of the leasing process, and store transaction records for the leasing process to provide legal protection for tenants and landlords. The emerging technologies, including smart contract and IPFS (Inter Planetary File System) are exploited in the new system. IPFS is used to store listings information. The Ethereum's Smart Contract is used to manage the hash of IPFS listings information, and a smart lease contract is written to make the housing rental process traceable and visible. 2 RELATED WORK Blockchain (Yuan, 2016) is a new decentralized infrastructure and distributed computing paradigm 184

A method for the asymmetric construction of functionalized acyclic all‐carbon quaternary stereocenters and 1,3‐nonadjacent stereoelements has been developed via organo/metal dual catalyzed asymmetric allenylic substitution of branched and linear aldehydes, by developing an unknown acyclic secondary‐secondary diamine as the enabling organocatalyst. Although it is believed that secondary‐secondary diamines are difficult to be used as the organocatalysts in organo/metal dual catalysis, this study demonstrates that such diamines can be successfully combined with a metal catalyst in organo/metal dual catalysis. Our study enables the asymmetric construction of two important classes of motifs which were previously difficult to access, axially chiral allene‐containing acyclic all‐carbon quaternary stereocenters and 1,3‐nonadjacent stereoelements bearing allenyl axial chirality and central chirality, in good yields with high enantio‐ and diastereoselectivity.