Planar surface reconstruction using circle generator laser light

A method is presented for finding the spatial position and orientation of a planar surface using a laser light source that generates structured light in the form of concentric circles. The purpose of the work is to provide the foundation for mapping regular and irregular surfaces for use in spatial surface reconstruction. The results of this work will lead to practical applications in the evaluation of pre- and post-surface deformation, and the reconstruction and representation of higher ordered surfaces. The latter having application as an alternative approach for capturing surfaces in direct geometric terms as opposed to the copious data discretization methods employed in surface reconstruction today.     

Stereospecific hydrohalogenation reactions of electron-deficient alkynes

Stereospecific hydrohalogenation reactions of electron-deficient alkynes,i.e.,2-alkynoic acids,2-alkynoates,2-propynamides,2-propynenitrile,1-alkynyl phosphonates/phosphine oxides,1-alkynyl sulfoxides/triflones,and 1-alkynyl iodonium salts with lithium or sodium halides to afford Z-alkenyl derivatives and their applications in synthesis of important intermediates as well as natural products were reviewed.     

The effect of water vapour on the cyclodextrin-solute interaction in gas-solid chromatography

The effect of water vapour on the interaction between the solutes and a cyclodextrin was studied chromatographically in a gas/solid system. It has been shown that all the sorbates capable of forming inclusion complexes with -CD are affected by the presence of water, in contrast to the sorbates that do not interact with -CD, which are unaffected. The measurements were carried out with the cyclodextrin deposited on a solid carrier (Chromosorb W) and with water vapour contained in the mobile phase. Some advantages of this system have been demonstrated for an analytical application.Presented at the Fourth International Symposium on Inclusion Phenomena and the Third International Symposium on Cyclodextrins, Lancaster, U.K., 20–25 July 1986.     

Optical sensor to measure the velocity of a surface

A device for measuring the velocity of a surface using the transit time technique is presented. The design of the prototype has been developed particularly for automotive use. Moreover, this paper gives a thorough evaluation of the problem of data elaboration.     

HPLC determination and antihypertensive effect of metipamide

Summary Metipamide was monitored during a two month cap period of treatment to determine whether the wholeblood levels estimated by HPLC provide a relevant indicator of the possible accumulation of the drug., We also analysed antihypertensive activity and biochemical changes in blood of twenty hypertonic patients. Result showed that metipamide is an effective, first-line antihypertensive agent, combining statisfactory blood pressure reduction with low frequency of side effects and a simple once-daily dosage regime.     

Fluctuations in the population of the ground state of Bose Systems

Formulas are given which show how the fluctuations of the ground-state occupation number in a Bose System are strongly suppressed at low temperatures.     

Micro-electromechanical Systems for Nano-science

Micro-electromechanical systems are ideal tools for nano-science because they bridge the gap between the nano- and the macro-world. Moreover, several of these instruments can be operated in parallel to either increase the throughput or to provide redundancy. The majority of the components of such a system have dimensions above the nanometer scale. Still, some require placement and pattern accuracy well below this limit. This will be highlighted in a short review of a few examples: Scanning optical near field microscope probe fabrication, where an aperture of 50 nm in diameter was incorporated at the probing tip; parallel scanning force microscope for measuring dust particles on Mars where redundancy is essential; and a miniaturized electron column for parallel electron beam lithography, where the throughput needs to be increased.     

Backscattered electrons from gold surface films deposited on silicon substrates: a joint experimental and computational investigation to add new potentiality to electron microscopy

This paper addresses the problem of the thickness determination of thin gold overlayers deposited on silicon bulk substrates by looking at the electron backscattering coefficient involved in scanning electron microscopy (SEM). A Monte Carlo code, used to calculate the backscattering coefficient, together with a simple experimental setup, which uses a conventional SEM, allow to determine thin film thickness (in the range 25–200 nm) with an estimated accuracy of 20%. This adds obviously new potentiality to SEM. Copyright © 2012 John Wiley & Sons, Ltd.