A novel biferocene trinuclear complex for Schiff base ligand S-methyl-N- (ferrocenyl-1-methyl -methylidene) dithiocarbazate thereafter abbreviated as HL) is described. X-ray diffraction studies established the structu...A novel biferocene trinuclear complex for Schiff base ligand S-methyl-N- (ferrocenyl-1-methyl -methylidene) dithiocarbazate thereafter abbreviated as HL) is described. X-ray diffraction studies established the structure of the palladium complex, PdL2. The geometry of Pd (II) in the complex is close to square planar and in novel cis-configuration with two ferrocene moieties on the same side. Degenerate four-wave mixing (DFWM) measurements show that the complex exhibit obvious nonlinear optical response.展开更多
The optical fiber with pure quartz core and Fluorine-doped glass cladding was made by POD (plasma outside deposition) technique in some corporations, while we used the creative technique of “overcladding F-doped tube...The optical fiber with pure quartz core and Fluorine-doped glass cladding was made by POD (plasma outside deposition) technique in some corporations, while we used the creative technique of “overcladding F-doped tube onto quartz rod in high temperature” to make the optical fiber which has the same structure as that from POD, in order to research and compare the influence factors on the loss of the fiber, our research work includes contrast experiments on coating polymers with different refractive index and the concentricity error of the fiber core and cladding. The measurement results show us that there are great differences in the loss spectra between the different fiber samples. We made analysis of it.展开更多
An array of natural products bearing chiral peroxide motifs display antitumor,anticancer,and antiparasitic activities.However,there are very few catalytic asymmetric syntheses of chiral peroxides.Moreover,effective ca...An array of natural products bearing chiral peroxide motifs display antitumor,anticancer,and antiparasitic activities.However,there are very few catalytic asymmetric syntheses of chiral peroxides.Moreover,effective catalysts for asymmetric catalytic peroxidations are limited to chiral amines.To further expand synthetic access to chiral peroxides,the development of new catalysts realizing catalytic asymmetric peroxidation is highly desirable yet challenging.We report here a catalytic asymmetric peroxidation of anα,β-unsaturated triflone-kinetic resolution cascade reaction,which furnishes chiral peroxides in greater than 99.9%ee.The realization of this cascade reaction resulted from the development of two betaines as novel catalysts for chiral peroxide synthesis;one betaine promoted enantioselective peroxidation ofα,β-unsaturated triflones via conjugate addition affording peroxides in 80-92%ee,while the other betaine catalyzed kinetic resolution of the newly generated chiral peroxides to further increase the ee to greater than 99.9%.展开更多
The complex amplitude distribution which can compensate for the spherical aberration caused by mismatch on lnterthce between recording material and immersion material （air） on three-dimensional optical storage syste...The complex amplitude distribution which can compensate for the spherical aberration caused by mismatch on lnterthce between recording material and immersion material （air） on three-dimensional optical storage system is derived analytically and numerically. Comparison between two approaches is made. It is also shown how the depth of recording layer and position of reference plane are related to the phase distribution at reference plane and how the mismatch can be resolved by using a pure phase element.展开更多
研究了光纤的辐照损伤机理,对纯硅芯光纤与传统芯层掺杂光纤的结构特点进行了系统地分析,从结构组成特点上分析了两者的抗辐照性能差异。研究了国内外关于光纤的抗辐照试验标准,对各标准中剂量率、总剂量等试验条件差异进行了对比,并对...研究了光纤的辐照损伤机理,对纯硅芯光纤与传统芯层掺杂光纤的结构特点进行了系统地分析,从结构组成特点上分析了两者的抗辐照性能差异。研究了国内外关于光纤的抗辐照试验标准,对各标准中剂量率、总剂量等试验条件差异进行了对比,并对不同剂量率对光纤辐照试验结果的影响进行了分析,给出了光纤在空间辐照环境条件下应用的γ辐照试验条件的选择原则。最后,采用0.1 rad(Si)/s剂量率对某国产纯硅芯光纤的抗辐照性能进行了试验评估,光纤在20 k rad(Si)总剂量辐照后光纤损耗为1.934 d B/km。空间辐照性能评估结果满足该项目的宇航型号的空间环境使用需求,辐照评估结论为可用。展开更多
In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron mi...In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron microscope (SEM) were used to analyze the structure of the film.The thickness of the pure aluminum corrosion sensitive film was about 14.65 μm, and the film was distributed evenly and firmly bonded with the fiber core.Galvanostatic step and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion resistance in NaCl solution with different concentrations (0.001—0.1 mol·L -1).The result showed that the corrosion resistance of the aluminum film was similar to that of industrial pure aluminum in NaCl solution with the concentration less than 0.1 mol·L -1.But the EIS data showed that there were holes on the film surface.展开更多
文摘A novel biferocene trinuclear complex for Schiff base ligand S-methyl-N- (ferrocenyl-1-methyl -methylidene) dithiocarbazate thereafter abbreviated as HL) is described. X-ray diffraction studies established the structure of the palladium complex, PdL2. The geometry of Pd (II) in the complex is close to square planar and in novel cis-configuration with two ferrocene moieties on the same side. Degenerate four-wave mixing (DFWM) measurements show that the complex exhibit obvious nonlinear optical response.
文摘The optical fiber with pure quartz core and Fluorine-doped glass cladding was made by POD (plasma outside deposition) technique in some corporations, while we used the creative technique of “overcladding F-doped tube onto quartz rod in high temperature” to make the optical fiber which has the same structure as that from POD, in order to research and compare the influence factors on the loss of the fiber, our research work includes contrast experiments on coating polymers with different refractive index and the concentricity error of the fiber core and cladding. The measurement results show us that there are great differences in the loss spectra between the different fiber samples. We made analysis of it.
基金We gratefully acknowledge funding from the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(grant no.2020R01004)the National Natural Science Foundation of China(grant no.U22A20389).
文摘An array of natural products bearing chiral peroxide motifs display antitumor,anticancer,and antiparasitic activities.However,there are very few catalytic asymmetric syntheses of chiral peroxides.Moreover,effective catalysts for asymmetric catalytic peroxidations are limited to chiral amines.To further expand synthetic access to chiral peroxides,the development of new catalysts realizing catalytic asymmetric peroxidation is highly desirable yet challenging.We report here a catalytic asymmetric peroxidation of anα,β-unsaturated triflone-kinetic resolution cascade reaction,which furnishes chiral peroxides in greater than 99.9%ee.The realization of this cascade reaction resulted from the development of two betaines as novel catalysts for chiral peroxide synthesis;one betaine promoted enantioselective peroxidation ofα,β-unsaturated triflones via conjugate addition affording peroxides in 80-92%ee,while the other betaine catalyzed kinetic resolution of the newly generated chiral peroxides to further increase the ee to greater than 99.9%.
文摘The complex amplitude distribution which can compensate for the spherical aberration caused by mismatch on lnterthce between recording material and immersion material （air） on three-dimensional optical storage system is derived analytically and numerically. Comparison between two approaches is made. It is also shown how the depth of recording layer and position of reference plane are related to the phase distribution at reference plane and how the mismatch can be resolved by using a pure phase element.
文摘研究了光纤的辐照损伤机理,对纯硅芯光纤与传统芯层掺杂光纤的结构特点进行了系统地分析,从结构组成特点上分析了两者的抗辐照性能差异。研究了国内外关于光纤的抗辐照试验标准,对各标准中剂量率、总剂量等试验条件差异进行了对比,并对不同剂量率对光纤辐照试验结果的影响进行了分析,给出了光纤在空间辐照环境条件下应用的γ辐照试验条件的选择原则。最后,采用0.1 rad(Si)/s剂量率对某国产纯硅芯光纤的抗辐照性能进行了试验评估,光纤在20 k rad(Si)总剂量辐照后光纤损耗为1.934 d B/km。空间辐照性能评估结果满足该项目的宇航型号的空间环境使用需求,辐照评估结论为可用。
文摘In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron microscope (SEM) were used to analyze the structure of the film.The thickness of the pure aluminum corrosion sensitive film was about 14.65 μm, and the film was distributed evenly and firmly bonded with the fiber core.Galvanostatic step and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion resistance in NaCl solution with different concentrations (0.001—0.1 mol·L -1).The result showed that the corrosion resistance of the aluminum film was similar to that of industrial pure aluminum in NaCl solution with the concentration less than 0.1 mol·L -1.But the EIS data showed that there were holes on the film surface.
