Comment on "Local accumulation times for source, diffusion, and degradation models in two and three dimensions" [J. Chem. Phys. 138, 104121 (2013)]

In a recent paper, Gordon, Muratov, and Shvartsman studied a partial differential equation (PDE) model describing radially symmetric diffusion and degradation in two and three dimensions. They paid particular attention to the local accumulation time (LAT), also known in the literature as the mean action time, which is a spatially dependent timescale that can be used to provide an estimate of the time required for the transient solution to effectively reach steady state. They presented exact results for three-dimensional applications and gave approximate results for the two-dimensional analogue. Here we make two generalizations of Gordon, Muratov, and Shvartsman’s work: (i) we present an exact expression for the LAT in any dimension and (ii) we present an exact expression for the variance of the distribution. The variance provides useful information regarding the spread about the mean that is not captured by the LAT. We conclude by describing further extensions of the model that were not considered by Gordon,Muratov, and Shvartsman. We have found that exact expressions for the LAT can also be derived for these important extensions...

Electron-Paramagnetic-Res study of LiKSO4 in phase IV below -138 degrees C

A detailed single-crystal EPR study of phase IV of lithium potassium sulphate below -138 degrees C has been carried out using NH3+, which substitutes for K+, as the paramagnetic probe. The spin-Hamiltonian parameters have been evaluated at -140 degrees C and yield an isotropic g=2.0034; (AH)XX=(AH)YY=25.3 G and (AH)ZZ=23.8 G; (AN)XX=8.1 G, (AN)YY=21.2 G and (AN)ZZ=25.9 G. In this phase there are 12 magnetically inequivalent K+ sites and their occurrence is ascribed to the loss of a c glide.

Reply to Discussion on ``Bearing capacity of circular footings over rock mass by using axisymmetric quasi lower bound finite element limit analysis'' Comput. Geotech. 70 (2015) 138-149]

A discussion has been provided for the comments raised by the discusser (Clausen, 2015)1] on the article recently published by the authors (Chakraborty and Kumar, 2015). The effect of exponent alpha for values of GSI approximately smaller than 30 becomes more critical. On the other hand, for greater values of GSI, the results obtained by the authors earlier remain primarily independent of alpha and can be easily used. (C) 2015 Elsevier Ltd. All rights reserved.

Diário da Constituinte [gravação de vídeo] : [programa n. 138 A]

O Senador Mauro Benevides (PMDB-CE) assume a Presidência da Assembleia Nacional Constituinte (ANC) e preside a primeira sessão plenária do período de debates do novo anteprojeto. A Reforma Agrária terá dez artigos. A Deputada Raquel Capiberibe (PSB-AP) relata que o texto não reflete as aspirações do povo. O Deputado Vicente Bogo (PMDB-RS) relata que a reforma agrária atingirá o latifundiário e o pequeno proprietário. O Deputado Tadeu França (PMDB-PR) defende que as propriedades dos Estados do sul tenham, no máximo, mil hectares e, nas demais regiões, hum mil e quinhentos hectares. O Deputado Carlos Cardinal (PDT-RS) reivindica recursos para que hajam desapropriações rápidas. O Deputado Waldyr Pugliesi (PMDB-PR) esclarece que foram aprovados dispositivos que implicariam a derrogação de alguns artigos do Estatuto da Terra, uma lei criada no Governo Castello Branco, concluindo que a nova Constituição terá que avançar e jamais retroagir.