Group valued measures with the lyapunoff property

Dopo aver dato una definizione di parte convessa di un gruppo topologico, si stabilisce una condizione affinchè il condominio di una misura sia convesso.     

Pyrolysis of homoadamant-3-ene

Pyrolysis of homoadamant-3-ene ($\text{5}$), generated from 1-adamantylcarbene ($\text{7}$), leads to the same three olefins ($\text{2}$, $\text{3}$, and $\text{4}$) that are produced from pyrolysis of 3-homoadamantyl acetate ($\text{1}$).     

Porous shape memory polymers: Design and applications

Porous shape memory polymers (SMPs) exhibit geometric and volumetric shape change when actuated by an external stimulus and can be fabricated as foams, scaffolds, meshes, and other polymeric substrates that possess porous three-dimensional macrostructures. These materials have applications in multiple industries such as textiles, biomedical devices, tissue engineering, and aerospace. This review article examines recent developments in porous SMPs, with a focus on fabrication methods, methods of characterization, modes of actuation, and applications. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1300–1318     

Direct determination of intermolecular potentials from gaseous transport coefficients alone

Intermolecular pair-potential energy functions are given for all the unlike interactions of the monatomic gases. The potentials are obtained by direct inversion of experimental measurements of low density binary mixture viscosity and diffusion coefficients. In those cases where these data extend to sufficiently low temperatures to enable the potential well depth ε/k to be determined, the values obtained for this parameter are Kr-Xe 220 ± 5 K, Ar-Xe 170 ± 5 K, Ar-Kr 165 ± 10 K, Ne-Xe 70 ± 5 K, Ne-Kr 60 ⁺¹⁰ _-5 K, Ne-Ar 60 ± 5 K. For the systems He-Xe, He-Kr, He-Ar and He-Ne only the repulsive branch of the potential energy function is obtained. For all systems the potentials are shown to reproduce well other macroscopic data not used in their construction. The agreement with thermal diffusion data is particularly encouraging. The independent determination of this wide range of potentials provides a direct test of both the hypothesis that they are conformal and the validity of parameter mixing rules. Significant deviations from conformality are found at the extremes of small and large intermolecular separations. No simple combining rules reproduce the potential parameters quantitatively, but the direction in which empirical modifications should be made is clearly suggested.     

Evidence for cyclopropene formation in the reactions of 4,4-dimethyl-4-silacyclohexadienylidene

In the reactions of 4,4-dimethylcyclohexadienylidene no evidence for cyclopropene formation has been found. By contrast, 4,4-dimethyl-4-silacyclohexadienylidene yields a product on reaction with butadiene that is best rationalized by intramolecular cyclopropene formation.