XYJHEN the airbrasive technic for cavity preparation is used, there is alW ways a hazard that some of the powder, tooth substance, and old filling material will be inhaled or introduced into the adjacent gingival tissues. It seemed desirable, therefore, to investigate tissue reactions to these substances. According to specifications from the manufacturer of the airbrasive powder,* it contains A...

Scanning electrochemical cell microscopy (SECCM) is a scanning-droplet-based technique that allows fluxes and/or interfacial reactivity to be measured and visualized with high spatiotemporal resolution. This minireview spotlights the use of SECCM for studying electrochemistry (nano)particles, highlighting recent works spanning multiple timescales (i.e., microseconds seconds) lengthscales nanome...

Consider the system of particles on Z where particles are of two types, A and B, and execute simple random walks in continuous time. Particles do not interact with their own type, but when a type A particle meets a type B particle, both disappear. Initially, particles are assumed to be distributed according to homogeneous Poisson random fields, with equal intensities for the two types. This sys...

A particle reaction model including mass and heat transfer has been developed to know the temperature variations produced inside the oxygen carrier particles during the cyclic reduction and oxidation reactions taking place in a Chemical-Looping Combustion (CLC) system. The reactions of the different oxygen carriers based on Cu, Co, Fe, Mn, and Ni during the reduction with fuel gas (CH4, CO, and...

The shock compression of spatially-resolved particle systems is studied at the mesoscale through a series of finite element simulations. The simulations involve propagating shock waves through aluminium–iron oxide thermite systems (Al+Fe2O3) composed of micron-size particles suspended in a polymer binder. Shock-induced chemical reactions are not considered in this work; the particle systems are...

Effective gas dispersion and liquid mixing are significant parameters in the design of an inert-particle spouted-bed reactor (IPSBR) system. Solid particles can be used to ensure good efficient rate mass heat transfer between liquid. In this study, computational fluid dynamics (CFD) coupled with discrete phase model (DPM) were developed investigate effect feed velocity (0.5–1.5 m/s), orifice di...

objective eudragits are widely used polymers in the production of oral sustained release dosage forms. the application of these polymers in the production of inert insoluble matrices has been investigated. however the effect of particle size, compaction force and presence of aerosil 200 as a glidant on the properties of eudragit rs and rl matrices prepared by direct compression of their physica...

Sequence of events DURING the 1999/2000 influenza outbreak, a 53-year-old man consulted because of a persistent productive cough that followed a flu-like illness. The patient was examined and prescribed erythromycin (Erymax® [Elan]) capsules. He made it very clear that he had a previous history of aspirin allergy and was reassured that there was no known cross-sensitivity between erythromycin a...