Nickel nanoparticles were found to promote the Wittig-type olefination of primary alcohols with phosphorus ylides. The latter can be prepared from the corresponding phosphonium salts with nBuLi or in situ generated with lithium metal. The methodology is especially efficient for…

Social knowledge is one of the key aspects of MAS in order to face complex problems in dynamical environments. However, it is usually incorporated without specific support on behalf of the platform and that does not let agents take all…

Based on the results of the coupled-wave theory the diffraction efficiency is calculated for thick phase transmission holographic gratings taking into account the chemical processing of the recording material. Three effects of processing are considered: variations in the average refractive…

We present three ways of treating the problem of fluid flow in a hollow cylinder. One method involves a differential equation, and the other two involve more physical insight. We discuss the relative advantages of each method., The following article…

Purpose – Faced with increasing environmental problems, traditional methods for transmitting information regarding corporate environmental actions are insufficient. Accordingly, the purpose of this paper is to suggest the environmental capital report, the knowledge map and the balanced scorecard as alternative…

The experimental results of diffraction efficiency as a function of the geometrical disposition of recording beams in bleached silver halide transmission thick-holographic gratings are presented. Two variables have been used to relate these results with certain geometric parameters. These variables…

Evaluations are provided of 21 descriptors of Posidonia oceanica meadows along the coast of Valencia, Spain, with a view to using these in implementing the European Water Framework Directive (WFD). The descriptors selected are known to respond to a variety…

Total quality management (TQM) has been developed around a number of critical factors. However, TQM is much more than a number of critical factors; it also includes other components, such as tools and techniques for quality improvement. In this paper,…

Pararem atenció sobre la construcció “Preposició en + Gerundi” (que té en Marc una de les primeres documentacions en l’expressió de l’anterioritat immediata) i sobre les perífrasis “estar + Gerundi” i “venir a/ en + Infinitiu”. Aquestes qüestions sintàctiques tenen…

To calculate retinal magnification and visual acuity in highly myopic phakic eyes corrected with anterior chamber intraocular lenses (IOLs) versus correction by other methods.
Relative retinal magnification (RRM) was used to study changes in retinal image size induced by different…