To obtain a better Vinogradov's bound, assistant function with two or three zeros and all Dirichlet's characters has been evaluated. Assistant function g(X1,X2,X3,X4)with four zeros and all nonprincipal charac...To obtain a better Vinogradov's bound, assistant function with two or three zeros and all Dirichlet's characters has been evaluated. Assistant function g(X1,X2,X3,X4)with four zeros and all nonprincipal characters but X1X2X3X4 is constructed and evaluated in the paper. And the constant obtained is 8.395 511 841 994.展开更多
In this paper, by using the W-transform of an operator on white noise functionals, we establish a general characterization theorem for operators on white noise functionals in term of growth condition. We also discuss ...In this paper, by using the W-transform of an operator on white noise functionals, we establish a general characterization theorem for operators on white noise functionals in term of growth condition. We also discuss convergence of operator sequences.展开更多
The characteristic studies, by means of LR, UV-Vis and XPS spectroscopies, of the preparation process of Mo-Co-S and Mo-Fe-S catalysts for HDS and HDN, derived from (NH4)2MoS4-CoCl2 and (NH4)2MoS4-FeCl2 complexes supp...The characteristic studies, by means of LR, UV-Vis and XPS spectroscopies, of the preparation process of Mo-Co-S and Mo-Fe-S catalysts for HDS and HDN, derived from (NH4)2MoS4-CoCl2 and (NH4)2MoS4-FeCl2 complexes supported on γ-Al2O3, respectively, indicate that the catalytically essential moiety on the surface of the catalysts is dominantly some sulfido-bimetallic species with such a structural unit (M' =Co or Fe), and both Co and Fe, served as promoters, can donate electrons to Mo probably via bridging-S. The nature of active-sites and the mechanism of promotion are discussed according to the results.展开更多
3-d iam ino-6-(3,5-d im ethylpyrazol-1-yl)-1,2,4,5-tetrazine(ADMPT),3,6-d iam ino-1,2,4,5-tet-razine(DATZ),3,6-d ihydra-zino-1,2,4,5-tetrazine(DHT),3,3’-azob is(6-am ino-1,2,4,5-tetrazine)(DAAT) and som e h igh-n itr...3-d iam ino-6-(3,5-d im ethylpyrazol-1-yl)-1,2,4,5-tetrazine(ADMPT),3,6-d iam ino-1,2,4,5-tet-razine(DATZ),3,6-d ihydra-zino-1,2,4,5-tetrazine(DHT),3,3’-azob is(6-am ino-1,2,4,5-tetrazine)(DAAT) and som e h igh-n itrogen energetic compounds were synthesized.The structures of the compounds were confirm ed by elem ent analysis,IR,1H NMR and13C NMR spectra etc.展开更多
基金Supported by the National Natural Science Foundation of China(10171076)Supported by the Scientific and Technical Committee Foundation of Shanghai(03JC14027)
文摘To obtain a better Vinogradov's bound, assistant function with two or three zeros and all Dirichlet's characters has been evaluated. Assistant function g(X1,X2,X3,X4)with four zeros and all nonprincipal characters but X1X2X3X4 is constructed and evaluated in the paper. And the constant obtained is 8.395 511 841 994.
文摘In this paper, by using the W-transform of an operator on white noise functionals, we establish a general characterization theorem for operators on white noise functionals in term of growth condition. We also discuss convergence of operator sequences.
基金Supported by the National Natural Science Foundation of China
文摘The characteristic studies, by means of LR, UV-Vis and XPS spectroscopies, of the preparation process of Mo-Co-S and Mo-Fe-S catalysts for HDS and HDN, derived from (NH4)2MoS4-CoCl2 and (NH4)2MoS4-FeCl2 complexes supported on γ-Al2O3, respectively, indicate that the catalytically essential moiety on the surface of the catalysts is dominantly some sulfido-bimetallic species with such a structural unit (M' =Co or Fe), and both Co and Fe, served as promoters, can donate electrons to Mo probably via bridging-S. The nature of active-sites and the mechanism of promotion are discussed according to the results.
文摘3-d iam ino-6-(3,5-d im ethylpyrazol-1-yl)-1,2,4,5-tetrazine(ADMPT),3,6-d iam ino-1,2,4,5-tet-razine(DATZ),3,6-d ihydra-zino-1,2,4,5-tetrazine(DHT),3,3’-azob is(6-am ino-1,2,4,5-tetrazine)(DAAT) and som e h igh-n itrogen energetic compounds were synthesized.The structures of the compounds were confirm ed by elem ent analysis,IR,1H NMR and13C NMR spectra etc.
