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1.
M. J. Gaylard G. C. MacLeod D. P. Smits M. E. West D. J. Walt 《Journal of chemical crystallography》1993,23(9):763-763
Future contributions toJournal of Crystallographic and Spectroscopic Research 相似文献
2.
With a view to applications to self-regulating dynamical processes in biology, we determine the geometric structure of what we call isotangent curves, i.e. curves parametrized by the slopes of their points. They come up naturally as bifurcation curves of rational unfoldings of X
k, and we classify them according to degree and number of cusps. They, as well as their isotangent involute curves, turn up in simulations of these processes. 相似文献
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R. de Gelder J. M. M. Smits W. A. J. Starmans L. Thijs B. Zwanenburg 《Journal of chemical crystallography》1996,26(9):639-642
The crystal and molecular structure of a new azetidine-2-carboxylic amide derivative is described. The structure was solved by direct methods and refined by least squares methods toR1=0.0393 for 4264 reflections (withI>2(I)) The structure consists of two independent molecules which are chemically the same with slight differences in geometry. Crystal data: C17H24N2O, monoclinic, space groupP21,a=8.3782(4),b=20.0342(13),c=9.7769(8) Å, =109.687(6)°,V=1545.1(2)Å3,Z=4. 相似文献
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Using a solution of a nonhomogeneous partial differential equation involving the p-Laplacian, we study the finiteness of the expected time to end the tug-of-war in a wedge. 相似文献
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J. Smits R. Van Grieken 《International journal of environmental analytical chemistry》2013,93(2):81-91
Abstract The 2,2′-diaminodiethylamine (DEN) functional group can be expected to have ideal properties for the chelation of transition metals and their collection from aqueous solutions, independent of the alkali and alkaline earth ions concentration. Introducing DEN into cellulose filters allows straightforward preconcentration of trace cations by a simple filtration step, and the DEN-filter constitutes a suitable target for X-ray fluorescence (XRF) analysis. The linearity between the XRF-response on the loaded DEN-filter and the trace cation concentration in the solution appears excellent, up to a total filter capacity of ca. 3 μeq.cm?2. The detection limits are around 0.5 μg. l?1 in most practical cases. Accuracy and precision are around 10%. The applicability of the proposed procedure is illustrated on a comparative basis by XRF-analysis of drinking water and surface water, after preconcentration by DEN-filtration and by alternative procedures. 相似文献
10.
F. Farina Arboccò P. Vermaercke K. Smits L. Sneyers K. Strijckmans 《Journal of Radioanalytical and Nuclear Chemistry》2013,296(2):931-938
The k 0 -literature has been reviewed every decade but some of its nuclear data is still more than 30 years old. Sometimes Q 0 values were adopted from the nuclear data at that time or were experimentally determined by only 1 laboratory. Other isotopes were listed with accurate pairs of (k 0 , Q 0 ) values but were also quoted as candidates for redetermination for different reasons (i.e. imprecise cadmium transmission factors, half-lives). In this work we aim at the experimental re-determination of k 0 and Q 0 values for 41 isotopes of analytical interest while introducing a methodology for simultaneous $ \bar{E}_{r} $ and Q 0 determination employing N irradiation channels. In order to satisfy the metrological level required, up to 12 repeats per standard were irradiated in up to 4 irradiation channels of the Belgian Reactor 1 (BR1, SCK?CEN) having a wide spread in neutron characteristics. Our relative percentile differences to the literature values were usually ≤10 % for Q 0 factors, ≥25 % for $ \bar{E}_{r} $ values and ≤4 % for k 0 values. Our precision and accuracy are discussed thoroughly. 相似文献