The Sectoral Perspective

Electronic Structure and Properties of Non‐Alternant Hydrocarbons

“…(341 (37) It is worth noting that the fusion of a benzene ring onto fulvene (33) causes a hypsochromic shift of the first band in the electronic spectrum; this shift is correctly predicted by the HMO theoryllal. A similar increase is found in the energies of the N + V1 transitions in benzo derivatives of heptafulvene (38) in which the benzene ring is attached in position u or c. On the other hand, a significant bathochromic shift is to be expected if a benzene ring is fused in position b [ carbon atom in fulvene (heptafulvene) and its vinylogues (35) carries a large positive (negative) charge; the molecule should therefore be stabilized by the attachment of a substituent with a -M(+M) effect, e.g.…”

Thermodynamic Analysis of Structure-Activity Relationships of Drugs: Prediction of Optimal Structure

“…The linear free energy relations of Zahradnik (20,21) are also of the basic Hammett type but are restricted in their application to aliphaticcompounds of the type R-X. They can be written as: log(BRi/BRo) = a@ 0%.…”

Aerosol filtration by a cocurrent moving granular bed: penetration theory

“…Granular bed filters are of interest for collection of particles from hot gas streams in advanced power-generation systems such as combined cycle coal gasification or pressurized fluidized bed coal combustion (2)(3)(4)(5)(6)(7). A recent review of granular bed filtration theory and experiments is provided by Yung et al (8).…”

“…Common assumptions include (1) low dust concentration in the gas, (2) no dust accumulation on the collectors, and (3) complete retention of all particles that contact a collector (9). These studies are useful to explain results from clean-bed experiments but have not been extended to more practical, loaded-bed cases.…”