منابع مشابه
Heavy Element Chemistry
Portfolio Description This activity supports basic research on the fundamental chemistry of the elements beyond actinium (those elements with an atomic number greater than 89); typically uranium, neptunium, plutonium, americium, and curium. The goal of this activity is to understand the underlying chemical and physical principles that determine the behavior of the actinides and transactinides e...
متن کاملTrace Element Chemistry Studies
This work was undertaken to measure background silver in Illinois precipitation in the absence of any known seeding operations in or near Illinois. The overall rainfall-weighted mean concentration at several stations was 73 ng/liter. This is somewhat higher than has been found in unseeded precipitation in the western United States, but probably not high enough to preclude identification of silv...
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“Where I’m going there’s good energy and real excitement with so many different constituencies working to achieve the same goals”, says Robin Gorna, who takes up her new post on Feb 1 as executive director of the Partnership for Maternal, Newborn & Child Health (PMNCH), hosted in WHO’s headquarters in Geneva, Switzerland. On Jan 31, she will leave her post as executive director of AIDS Strategy...
متن کاملA New Stress Based Approach for Nonlinear Finite Element Analysis
This article demonstrates a new approach for nonlinear finite element analysis. The methodology is very suitable and gives very accurate results in linear as well as in nonlinear range of the material behavior. Proposed methodology can be regarded as stress based finite element analysis as it is required to define the stress distribution within the structural body with structural idealization a...
متن کاملOrganic & Biomolecular Chemistry Symmetry as a New Element to Control Molecular Switches †
PAPER Hermann A. Wegner et al. Symmetry as a new element to control molecular switches a The isomerization properties of an azocarbazole macrocycle in solution were investigated utilizing NMR spectroscopy with in situ irradiation in combination with DFT calculations. It was demonstrated that the position of azo units in a rigid macrocyclic system influences the photoisomerization pathway even i...
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ژورنال
عنوان ژورنال: Journal of Alloys and Compounds
سال: 1998
ISSN: 0925-8388
DOI: 10.1016/s0925-8388(98)00070-x