An alternative method to synthesize well-defined cyclic polymers via combination of anionic polymerization high vacuum techniques and Williamson etherification reaction in moderate dilution up 1 g scale.

Recent direct implementation of asperity theories is reinterpreted here to formulate an improved version of the Greenwood and Williamson GW) theory with the inclusion of interaction between asperities. This is achieved by treating the contact pressures as uniformly distributed over he apparent contact area and the resulting deformation as uniform. The correction is equivalent to an increase of ...

Nanocrystalline silicon embedded carbide, nc-Si(SiC) thin films were deposited on p-type substrates by using a thermal chemical vapor deposition (CVD) with different process temperatures from 700 to 1000 °C. The SEM images reveal the Si particles are SiC films. estimated crystallite size of was varied 14 28 nm and 40.7 61 respectively Scherrer formula Williamson – Hall formula. Similarly, latti...

The usefulness of the Craig counter-current distribution technique (1, 2) for studying the purity of compounds and the metabolic fate of therapeutic agents can be augmented by deriving the theoretical distribution values from the “Tables of the binomial probability distribution” (3). By use of such tables, which only recently have become generally available, laborious calculation of theoretical...

Cameron and Williamson have provided a provocative and timely review of the ethical questions prompted by the birth of Dolly. The question Cameron and Williamson seek to address is "In the world of Dolly, when does a human embryo acquire respect?". Their initial discussion sets the scene by providing a valuable overview of attitudes towards the embryo, summarising various religious, scientific,...