Described is the optically pure synthesis of 5-((-)-bornyloxy)-3,4-dichloro-8(5H)-furanone 4band the novel tandem Michael addition-elimination reaction of 4b with a seriea of thiols to providecorresponding new chiral ...Described is the optically pure synthesis of 5-((-)-bornyloxy)-3,4-dichloro-8(5H)-furanone 4band the novel tandem Michael addition-elimination reaction of 4b with a seriea of thiols to providecorresponding new chiral sowces 5a-e.展开更多
A new kind of nematocyst, heteromorphore, and three new types of nematocysts, microbasic spino-mastigophore, microbasic undulata-mastigophore, microbasic laevis-mastigophore, are described from medusae of the Xiamen H...A new kind of nematocyst, heteromorphore, and three new types of nematocysts, microbasic spino-mastigophore, microbasic undulata-mastigophore, microbasic laevis-mastigophore, are described from medusae of the Xiamen Harbour and discussed by comparison with the results of other research workers.展开更多
In 1923,J. Hadamard asserted that the ultra-hyperbolic equation does not seem to posess any "properlyposed" limit problem, that is, any auxiliary assures both the uniquenss and the existence of the solution....In 1923,J. Hadamard asserted that the ultra-hyperbolic equation does not seem to posess any "properlyposed" limit problem, that is, any auxiliary assures both the uniquenss and the existence of the solution.How to pose the ultra-hyperbolic eqution’s limit poblem is main problem for ultra-hyperbolic equation’ s re-search.Around this problem, many research works have been done. In this paper, it uses the method thatunknown function is expanded the characteristic function and characteristic value to discuss the homogenousDirichlet problem of inhomogeneous ultra-hyperbolic equation in the general compared simple fields and展开更多
文摘Described is the optically pure synthesis of 5-((-)-bornyloxy)-3,4-dichloro-8(5H)-furanone 4band the novel tandem Michael addition-elimination reaction of 4b with a seriea of thiols to providecorresponding new chiral sowces 5a-e.
文摘A new kind of nematocyst, heteromorphore, and three new types of nematocysts, microbasic spino-mastigophore, microbasic undulata-mastigophore, microbasic laevis-mastigophore, are described from medusae of the Xiamen Harbour and discussed by comparison with the results of other research workers.
文摘In 1923,J. Hadamard asserted that the ultra-hyperbolic equation does not seem to posess any "properlyposed" limit problem, that is, any auxiliary assures both the uniquenss and the existence of the solution.How to pose the ultra-hyperbolic eqution’s limit poblem is main problem for ultra-hyperbolic equation’ s re-search.Around this problem, many research works have been done. In this paper, it uses the method thatunknown function is expanded the characteristic function and characteristic value to discuss the homogenousDirichlet problem of inhomogeneous ultra-hyperbolic equation in the general compared simple fields and
