整车扭矩控制水平不仅体现着产品力,更关乎驾乘人员的生命安全。然而,多数厂商的扭矩控制主要依赖于质检部门的事后抽检,系统性管理较弱。以QCOS(Quality Control Operation Sheet,质量控制操作表)工具为基础,综合考虑扭矩分级、设备选...整车扭矩控制水平不仅体现着产品力,更关乎驾乘人员的生命安全。然而,多数厂商的扭矩控制主要依赖于质检部门的事后抽检,系统性管理较弱。以QCOS(Quality Control Operation Sheet,质量控制操作表)工具为基础,综合考虑扭矩分级、设备选用、防错、过程控制及事后检验等因素,协调各部门职责,形成一套整车扭矩控制策略,运用SPC(Statistical Process Control,统计过程控制)原理建立静态扭矩标准开发流程,并在量产车型上成功应用且效果良好。展开更多
To better understand the effects of forest suc- cession on soil microbial activity, a comparison of soil microbial properties and nutrients was conducted between three forest types representing a natural forest succes...To better understand the effects of forest suc- cession on soil microbial activity, a comparison of soil microbial properties and nutrients was conducted between three forest types representing a natural forest succession chronosequence. The study compared a pine （Pinus mas- soniana） forest （PF）, a pine and broadleaf mixed forest （MF） and an evergreen broadleaf forest （BF）, in the Yingzuijie Biosphere Reserve, Hunan Province, China. Results showed that soil nutrients in the MF and BF plots were higher than in the PF plots. The range in microbial biomass carbon followed a similar pattem with Be havingthe greatest values, 522-1022 mg kg-1, followed by Mr 368-569 mg kg-1, and finally, PF 193--449 mg kg-1. Soil nutrients were more strongly correlated with microbial biomass carbon than basal respiration or metabolic quo- tient. Overall, forest succession in the study site improved soil microbial properties and soil fertility, which in turn can increase primary productivity and carbon sequestration.展开更多
Hurricanes cause significant damage to tropical forests;however,little is known of their effects on decomposition and decomposer communities.This study demonstrated that canopy debris deposited during Hurricane Otto s...Hurricanes cause significant damage to tropical forests;however,little is known of their effects on decomposition and decomposer communities.This study demonstrated that canopy debris deposited during Hurricane Otto stimulated sequential changes in soil carbon(C)and nitrogen(N)components,and decomposer microbial communities over 5 years.The initial response phase occurred within 2 years post-hurricane and appeared associated with decomposition of the labile canopy debris,suggested by:increased DNA sequences(MPS)of the Acidobacterial community(as common decomposers of labile plant material),decreases in total organic C(TOC),increased biomass C,respiration,and NH_(4)^(+),conversion of organic C in biomass,and decreased MPS of complex organic C decomposing(CCD_(ec))Fungal community.After 3 years post-hurricane,the later response phase appeared associated with decomposition of the more stable components of the canopy debris,suggested by:increased MPS of the Fungal CCDec community,TOC,stabilized Respiration,decreased Biomass C,the return to pre-hurricane levels of the conversion of organic C to biomass,and decreased MPS of Acidobacterial community.These changes in the microbial community compositions resulted in progressive decomposition of the hurricane-deposited canopy material within 5 years,resulting several potential indicators of different stages of decomposition and soil recovery post-disturbance.展开更多
文摘整车扭矩控制水平不仅体现着产品力,更关乎驾乘人员的生命安全。然而,多数厂商的扭矩控制主要依赖于质检部门的事后抽检,系统性管理较弱。以QCOS(Quality Control Operation Sheet,质量控制操作表)工具为基础,综合考虑扭矩分级、设备选用、防错、过程控制及事后检验等因素,协调各部门职责,形成一套整车扭矩控制策略,运用SPC(Statistical Process Control,统计过程控制)原理建立静态扭矩标准开发流程,并在量产车型上成功应用且效果良好。
基金supported by International Science&Technology Cooperation Program of China(2012DFB30030)Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05050205)+3 种基金Natural Science Foundation of Hunan province(2015JJ6050)Hunan forestry science and technology program(XLK201417)Youth Innovation Fund of Hunan Academy of forestry(2013LQJ08)The Twelfth Five-Year Plan in national science and technology for the environment field(2012BAC09B03-4)
文摘To better understand the effects of forest suc- cession on soil microbial activity, a comparison of soil microbial properties and nutrients was conducted between three forest types representing a natural forest succession chronosequence. The study compared a pine （Pinus mas- soniana） forest （PF）, a pine and broadleaf mixed forest （MF） and an evergreen broadleaf forest （BF）, in the Yingzuijie Biosphere Reserve, Hunan Province, China. Results showed that soil nutrients in the MF and BF plots were higher than in the PF plots. The range in microbial biomass carbon followed a similar pattem with Be havingthe greatest values, 522-1022 mg kg-1, followed by Mr 368-569 mg kg-1, and finally, PF 193--449 mg kg-1. Soil nutrients were more strongly correlated with microbial biomass carbon than basal respiration or metabolic quo- tient. Overall, forest succession in the study site improved soil microbial properties and soil fertility, which in turn can increase primary productivity and carbon sequestration.
文摘Hurricanes cause significant damage to tropical forests;however,little is known of their effects on decomposition and decomposer communities.This study demonstrated that canopy debris deposited during Hurricane Otto stimulated sequential changes in soil carbon(C)and nitrogen(N)components,and decomposer microbial communities over 5 years.The initial response phase occurred within 2 years post-hurricane and appeared associated with decomposition of the labile canopy debris,suggested by:increased DNA sequences(MPS)of the Acidobacterial community(as common decomposers of labile plant material),decreases in total organic C(TOC),increased biomass C,respiration,and NH_(4)^(+),conversion of organic C in biomass,and decreased MPS of complex organic C decomposing(CCD_(ec))Fungal community.After 3 years post-hurricane,the later response phase appeared associated with decomposition of the more stable components of the canopy debris,suggested by:increased MPS of the Fungal CCDec community,TOC,stabilized Respiration,decreased Biomass C,the return to pre-hurricane levels of the conversion of organic C to biomass,and decreased MPS of Acidobacterial community.These changes in the microbial community compositions resulted in progressive decomposition of the hurricane-deposited canopy material within 5 years,resulting several potential indicators of different stages of decomposition and soil recovery post-disturbance.
