This paper describes the structural elucidation of a new insecticiaal neoclerodane diterpene Ajagamarin L-2 from Ajuga nipponensis,based on spectral data and X-ray diffraction analysis as 4,18-epoxy-6 alpha -hydroxy-1...This paper describes the structural elucidation of a new insecticiaal neoclerodane diterpene Ajagamarin L-2 from Ajuga nipponensis,based on spectral data and X-ray diffraction analysis as 4,18-epoxy-6 alpha -hydroxy-19-tigloyloxy-neo-clerod-13 (14) -en-15, 16-olide.展开更多
SINCE the 1970s coated cemented carbide tools have been developed so as to further improvetheir wear and heat resistance. For the coated tools, cemented carbide with high strength andfracture toughness are selected as...SINCE the 1970s coated cemented carbide tools have been developed so as to further improvetheir wear and heat resistance. For the coated tools, cemented carbide with high strength andfracture toughness are selected as matrix materials, carbide, boride and nitride with highhardness are used as coating materials. Because the coating thickness of the coated tools is gen-展开更多
PREVIOUS studies have shown that 50%—80% of the pollutant load in the snowpacks can be released with the first 30% of the meltwater. So the ion elution can alter the seasonal-layer distribution of chemical contents d...PREVIOUS studies have shown that 50%—80% of the pollutant load in the snowpacks can be released with the first 30% of the meltwater. So the ion elution can alter the seasonal-layer distribution of chemical contents deposited in the snowpacks and form a new chemical distribution, which is preserved perpetually as the ice core record. In order to reconstruct the paleoclimate and paleo-environment from the ice core with high accuracy, it is necessary to determine the correlation of the chemical distribution between pre- and post-ion elution processes.展开更多
文摘This paper describes the structural elucidation of a new insecticiaal neoclerodane diterpene Ajagamarin L-2 from Ajuga nipponensis,based on spectral data and X-ray diffraction analysis as 4,18-epoxy-6 alpha -hydroxy-19-tigloyloxy-neo-clerod-13 (14) -en-15, 16-olide.
文摘SINCE the 1970s coated cemented carbide tools have been developed so as to further improvetheir wear and heat resistance. For the coated tools, cemented carbide with high strength andfracture toughness are selected as matrix materials, carbide, boride and nitride with highhardness are used as coating materials. Because the coating thickness of the coated tools is gen-
文摘PREVIOUS studies have shown that 50%—80% of the pollutant load in the snowpacks can be released with the first 30% of the meltwater. So the ion elution can alter the seasonal-layer distribution of chemical contents deposited in the snowpacks and form a new chemical distribution, which is preserved perpetually as the ice core record. In order to reconstruct the paleoclimate and paleo-environment from the ice core with high accuracy, it is necessary to determine the correlation of the chemical distribution between pre- and post-ion elution processes.
