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1.
Kiyoshi Tanemura Yoko Nishida Tsuneo Suzuki Koko Satsumabayashi Takaaki Horaguchi 《Journal of heterocyclic chemistry》1997,34(2):457-460
1,3-Dithianes 1 , 1,3-dithiolanes 2 , and diphenyl dithioacetals 3 derived from cinnamaldehydes reacted with 2,3-dichloro-5,6-dicyano-p-benzoquinone in aqueous solvents to give benzaldehydes 4 . Hydride transfer from 1–3 to 2,3-dichloro-5,6-dicyano-p-benzoquinone followed by hydrolysis and oxidative carbon-carbon bond cleavage would produce benzaldehydes 4 . 相似文献
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Parallel preconditioned conjugate gradient algorithm on GPU 总被引:1,自引:0,他引:1
We propose a parallel implementation of the Preconditioned Conjugate Gradient algorithm on a GPU platform. The preconditioning matrix is an approximate inverse derived from the SSOR preconditioner. Used through sparse matrix–vector multiplication, the proposed preconditioner is well suited for the massively parallel GPU architecture. As compared to CPU implementation of the conjugate gradient algorithm, our GPU preconditioned conjugate gradient implementation is up to 10 times faster (8 times faster at worst). 相似文献
3.
Linda M. Guiney Alissa D. Agnello Julia C. Thomas Koko Takatori Nolan T. Flynn 《Colloid and polymer science》2009,287(5):601-608
We report the synthesis of N-isopropylacrylamide-based hydrogels containing either an anionic (acrylic acid) or cationic ([2-(acryloyloxy)ethyl]trimethylammonium
chloride) co-monomer. These hydrogels were cross-linked with a cleaveable (N,N′-cystaminebisacrylamide) and/or inert (N,N′-methylenebisacrylamide) molecule in four combinations. Gold nanostructures were then synthesized within these hydrogel matrices
by in situ reduction of a metal ion precursor. The resulting eight nanocomposites and their non-gold-containing (native) analogs
were characterized with several analytical methods. UV–visible and infrared spectroscopy revealed differences among the samples
based largely on the concentration and identity of cross-linking agent. Equilibrium swelling masses and phase transition behavior
point to differences among samples on charge of the hydrogel backbone, cross-linker type, and presence or absence of gold
nanostructures. A molecular level explanation for these observations is described. 相似文献
4.
Ibrahim S. Al Nasr Markus Weise Waleed S. Koko Tariq A. Khan Rainer Schobert Bernhard Biersack 《应用有机金属化学》2023,37(1):e6952
Gold(I) complexes carrying imidazole-2-ylidene ligands and ferrocene substituents were prepared. Their activities against protozoal Leishmania major and Toxoplasma gondii parasites were analyzed. Certain gold(I) complexes with chlorido and 1,1′-bis(triphenylphosphino)ferrocene ligands revealed promising antiparasitic effects. The new chlorido complexes 5b and 5c showed high activities against T. gondii tachyzoites and L. major promastigotes while the new ferrocene-bridged bis-gold(I) complexes 8a and 8b were particularly active against L. major amastigotes and considerably selective as to toxicity results from Vero cells and macrophages. 相似文献
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We propose a Uzawa block relaxation domain decomposition method for a two-body frictionless contact problem. We introduce auxiliary variables to separate subdomains representing linear elastic bodies. Applying a Uzawa block relaxation algorithm to the corresponding augmented Lagrangian functional yields a domain decomposition algorithm in which we have to solve two uncoupled linear elasticity subproblems in each iteration while the auxiliary variables are computed explicitly using Kuhn–Tucker optimality conditions. 相似文献
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UV irradiation of solutions of the (E)-isomers of five (out of the possible six) monopyridyl analogues at reduced temperatures results in extensive (80–90%) conversion into the corresponding (Z)-isomers. The process is reversible both thermally and photochemically. The (Z)-isomers are stable at temperatures below ?80°, and their absorption spectra were estimated. Biacetyl-photosensitized (E)(Z) isomerization was observed, with (Z)-contents of ca. 70% at the photo-stationary state. 相似文献
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We axiomatize the geometrical properties of T-tetromino to what we call generalised k-T-tetromino. Using this set of axioms, we show that the number of tilings of a 2kn × 2km rectangular region is given by T(L n,m ; 3, 3) if and only if the tile is a k-T-tetromino. This generalizes a result of Korn and Pak (Theor Comp Sci 319:3–27, 2004). 相似文献
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