Electronic and Structural Properties of a 4d-Perovskite: Cubic Phase of SrZrO3_3

First-principles density functional calculations are performed within the local density approximation to study the electronic properties of SrZrO$_3$, an insulating 4d-perovskite, in its high-temperature cubic phase, above 1400 K, as well as the generic 3d-perovskite SrTiO$_3$, which is also a d^0-insulator and cubic above 105 K, for comparison reasons. The energy bands, density of states and charge density distributions are obtained and a detailed comparison between their band structures is presented. The results are discussed also in terms of the existing data in the literature for both oxides.Comment: 5 pages, 2 figure

Performance assessment for sustainable construction: lest we forget about the client

Sustainability of the built environment is receiving much attention in recent times, mainly because the concept is inextricably linked with several key global issues e.g. economic, environmental, housing etc. An important aspect of these has to do with the assessment of the performance of the industry's quest for sustainability. This calls for a consideration of a well laid out approach of performance assessment. This should satisfy the multidimensional, multi-criteria concept. Hence, the need to identify the key measures, criteria, and the stakeholders becomes necessary. The authors believe that it should be addressed at the local (national) levels first, then, regional, continental, and finally at the global level. In addition, it is submitted that the client as the promoter of construction should be an active partner in ensuring sustainability. This, it is estimated, will be the necessary step towards managing sustainable construction at all levels

Notes on electropherograms of eye-lens, muscle proteins and zymograms of muscle esterases of fish collected during the first Brazilian expedition to the Antarctica

A preliminary study was carried out on electropherograms of eye-lens, muscle proteins and zymograms of muscle esterases of ten Notothenia larseni, six Notothenia nudifrons and one lanternfish, Electrona antarctica. The fish were collected by the R/V "Prof. W. Besnard" of the Institute of Oceanography, University of São Paulo, during the First Brazilian Expedition to Antarctica. Eye-lens proteins were analysed on cellulose acetate membrane, muscle proteins and esterases on gel of polyaorylamide. Eye-lens proteins showed three types of electropherograms for N. larseni, and two types for N. nudifrons. One of the electropherograms of N. larseni can be readily distinguished from those of N. nudifrons. Electropherograms of muscle proteins of N. larseni and N. nudifrons are very similar and, consist of sixteen to seventeen fractions. Electropherograms of muscle proteins of N. larseni are severely affected by the conservation of the extracts overnight under -20ºC. All N. nudifrons were of the same zymograms of esterases while those of N. larseni varied. Electropherograms of eye-lens and muscle proteins as well as zymograms of esterases of the lanternfish are different from those of nototheniids.Foi realizado um estudo preliminar sobre eletroferogramas de proteínas de cristalino e de músculo esquelético, e zimogramas de esterases de músculo esquelético de dez Notothenia larseni, seis Notothenia nudifrons e de um peixe-lanterna, Electrona antarctica. Os peixes foram coletados pelo N/Oc. "Prof. W. Besnard" do Instituto Oceanográfico da Universidade de São Paulo durante a I Expedição Brasileira à Antártica. As proteinas do cristalino foram analisadas em membranas de acetato de celulose, enquanto que as proteínas e esterases do músculo esquelético, em gel de poliacrilamida. As proteínas do cristalino apresentam três tipos distintos de eletroferogramas para N. larseni, e dois para N. nudifrons. Um dos eletroferogramas de N. larseni, pode ser prontamente distinguido dos de N. nudifrons. Eletrof erogramas de proteínas de músculo de N. larseni e de N. nudifrons são muito semelhantes e consistem de 16 a 17 frações. Os eletroferogramas de proteínas de músculo de N. larseni são severamente afetados pela preservação dos extratos por uma noite a -20ºC. Todos os N. nudifrons apresentam um mesmo zimograma de esterases enquanto que os de N. larseni variam. Tanto os eletroferogramas de proteínas do cristalino e do músculo como os zimogramas de esterases do peixe-lanterna são diferentes dos apresentados pelos nototeniideos