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31.
32.
W. Tate 《Fresenius' Journal of Analytical Chemistry》1891,30(1):312
Ohne Zusammenfassung 相似文献
33.
Summary. To a pair consisting of an elliptic curve and a point on it, Odeskii and Feigin associate certain quadratic algebras (“Sklyanin
algebras”), having the Hilbert series of a polynomial algebra.
In this paper we show that Sklyanin algebras have good homological properties and we obtain some information about their so-called
linear modules. We also show how the construction by Odeskii and Feigin may be generalized so as to yield other “Sklyanin-type”
algebras.
Oblatum 25-XI-1993 相似文献
34.
A. F. Halasa G. B. Mitchell M. Stayer D. P. Tate A. E. Oberster R. W. Koch 《Journal of polymer science. Part A, Polymer chemistry》1976,14(2):497-506
Polybutadiene was successfully metalated by use of tert-butyllithium activated with alkoxides of Group I metals without chain degradation. The metalated polymer was grafted with styrene and 1,3-butadiene to give novel graft copolymers of varying microstructure. This metalating system was found to be highly efficient; however, its catalyst effectiveness is less than that of organolithium-TMEDA metalation agent. 相似文献
35.
The performance of back-propagation artificial neural networks (NN) and partial least squares (PLS) regression for the calibration of linear and nonlinear systems has been investigated by using six types of synthetic data. Three PLS methods, conventional linear-PLS and two nonlinear-PLS methods, have been used in the study. In all but one of the synthetic data types, the band intensities varied nonlinearly with concentration. These five data types were designed to represent the effect of band shifts with increasing concentration, a nonlinear relationship between peak height and concentration, or a combination of both types of nonlinearities. The results showed that NNs perform better than PLS for all the nonlinear datasets. When a band shift is the major reason for the nonlinearity, the relative performance of NNs and PLS depends on the overlap of the absorption bands. If there is no band overlap, neither NN nor PLS can calibrate the data accurately but the results could be improved by convolving the spectral features with a Gaussian broadening function. The results indicate that a combination of peak position shift and peak height change is the most difficult nonlinearity to calibrate. NN and PLS were also used to determine the concentration of CHCl3 in pure component and mixtures of CHCl3 and CH2Cl2 using their Fourier transform infrared (FT-IR) spectra, a dataset that has been proved nonlinear in high concentrations due to the nonlinear response of the detector. The best results for the experimental data were obtained by applying one hidden layer NN to the mean-centered absorbance spectra. 相似文献
36.
37.
38.
39.
Thongyoo P Tate EW Leatherbarrow RJ 《Chemical communications (Cambridge, England)》2006,(27):2848-2850
The first total synthesis of MCoTI-II, a cysteine knot microprotein and potent trypsin inhibitor, is described; a synthetic strategy has been developed that combines efficient backbone construction via optimised solid phase peptide synthesis with one-pot 'thia-zip' native chemical ligation and refolding to yield the natural product. 相似文献
40.
R. M. Jennerich A. N. Keiser D. A. Tate 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,40(1):81-89
We have obtained Doppler-free spectra of transitions in the
→ 2p2(3P)
and
→
multiplets of atomic nitrogen using saturated absorption spectroscopy. These multiplets consist of
respectively of seven and eight transitions, and have center of gravity wavelengths of 821 nm and 869 nm. Values for the hyperfine
structure coupling constants of all the upper and lower states for these multiplets were obtained for both 14N and 15N. Isotope shifts of three transitions in each multiplet were also measured, and a significant J-dependence to the shifts
was observed. 相似文献