Hydrogenated nanocrystalline silicon fi1ms are deposited onto glass substrates at different substrate temperatures(140-400℃)by hot-filament chemical vapor deposition.The effect of substrate temperature on the structu...Hydrogenated nanocrystalline silicon fi1ms are deposited onto glass substrates at different substrate temperatures(140-400℃)by hot-filament chemical vapor deposition.The effect of substrate temperature on the structural properties are investigated.With an increasing substrate temperature,the Raman crystalline volume fraction increases,but decreases with a further increase.The maximum Raman crystalline volume fraction of the nanocrystalline silicon 61ms is about 74%and also has the highest microstructural factor(R=0.89)at a substrate temperature of 250℃.The deposition rate exhibits a contrary tendency to that of the crystalline volume fraction.The continuous transition of the fi1m structures from columnar to agglomerated is observed at a substrate temperature of 300℃.The optical band gaps of the grown thin 61ms declines(from 1.89 to 1.53 eV)and dark electrical conductivity increases(from about 10-10 to about 10-6 S/cm)with the increasing substrate temperature.展开更多
Amorphous hydrogenated and crystalline silicon thin films were prepared by hot-filament chemical vapor deposition.A structural transformation from amorphous phase to crystalline phase by increasing the filament temper...Amorphous hydrogenated and crystalline silicon thin films were prepared by hot-filament chemical vapor deposition.A structural transformation from amorphous phase to crystalline phase by increasing the filament temperature Tfil from 1600℃ to 1650℃ was observed.This phenomenon may result from the associated abundance of H radicals participating in the growth of the Silms.A probability distribution model of the H radical is proposed to elucidate this phenomenon.According to this model,the phase transition is due to a distinct difference in the probability distribution of the H radicals,which seems to be dependent upon Tfil.展开更多
在现代通信网络中,各节点设备之间需要高精度的时钟同步来达到硬实时的能力。高精度的时钟同步需要网络中交换机等传输设备支持精确时间同步协议。PTP精确时间协议(Precision Time Protocol)是一种高精度时间同步协议,在网络中通过同步...在现代通信网络中,各节点设备之间需要高精度的时钟同步来达到硬实时的能力。高精度的时钟同步需要网络中交换机等传输设备支持精确时间同步协议。PTP精确时间协议(Precision Time Protocol)是一种高精度时间同步协议,在网络中通过同步信号周期性对所有节点时钟校正。PTP一般在硬件级实现,能够达到纳秒级别,是现代通信网络中常用的时钟同步协议。展开更多
As an important second messenger, calcium is involved in plant cold stress response, including chilling（〈20 °C） and freezing（〈0 °C）. In this study, exogenous application of calcium chloride（CaCl2） im...As an important second messenger, calcium is involved in plant cold stress response, including chilling（〈20 °C） and freezing（〈0 °C）. In this study, exogenous application of calcium chloride（CaCl2） improved both chilling and freezing stress tolerances, while ethylene glycol‐bis‐（b‐aminoethyl） ether‐N,N,N,N‐tetraacetic acid（EGTA） reversed CaCl2 effects in bermudagrass（Cynodon dactylon（L.） Pers.）.Pysiological analyses showed that CaCl2 treatment alleviated the reactive oxygen species（ROS） burst and cell damage triggered by chilling stress, via activating antioxidant enzymes,non‐enzymatic glutathione antioxidant pool, while EGTA treatment had the opposite effects. Additionally, comparative proteomic analysis identified 51 differentially expressed proteins that were enriched in redox, tricarboxylicacid cycle,glycolysis, photosynthesis, oxidative pentose phosphate pathway, and amino acid metabolisms. Consistently, 42 metabolites including amino acids, organic acids, sugars, and sugar alcohols were regulated by CaCl2 treatment under control and cold stress conditions, further confirming the Researchcommon modulation of CaCl2 treatment in carbon metabolites and amino acid metabolism. Taken together, this study reported first evidence of the essential and protective roles of endogenous and exogenous calcium in bermudagrass response to cold stress, partially via activation of the antioxidants and modulation of several differentially expressed proteins and metabolic homeostasis in the process of cold acclimation.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 50802037the Natural Science Foundation of Gansu Province under Grant No 0710RJZA041.
文摘Hydrogenated nanocrystalline silicon fi1ms are deposited onto glass substrates at different substrate temperatures(140-400℃)by hot-filament chemical vapor deposition.The effect of substrate temperature on the structural properties are investigated.With an increasing substrate temperature,the Raman crystalline volume fraction increases,but decreases with a further increase.The maximum Raman crystalline volume fraction of the nanocrystalline silicon 61ms is about 74%and also has the highest microstructural factor(R=0.89)at a substrate temperature of 250℃.The deposition rate exhibits a contrary tendency to that of the crystalline volume fraction.The continuous transition of the fi1m structures from columnar to agglomerated is observed at a substrate temperature of 300℃.The optical band gaps of the grown thin 61ms declines(from 1.89 to 1.53 eV)and dark electrical conductivity increases(from about 10-10 to about 10-6 S/cm)with the increasing substrate temperature.
基金Supported by the National Natural Science Foundation of China under Grant No 50802037the Natural Science Foundation of Gansu Province under Grant No 0710RJZA041.
文摘Amorphous hydrogenated and crystalline silicon thin films were prepared by hot-filament chemical vapor deposition.A structural transformation from amorphous phase to crystalline phase by increasing the filament temperature Tfil from 1600℃ to 1650℃ was observed.This phenomenon may result from the associated abundance of H radicals participating in the growth of the Silms.A probability distribution model of the H radical is proposed to elucidate this phenomenon.According to this model,the phase transition is due to a distinct difference in the probability distribution of the H radicals,which seems to be dependent upon Tfil.
文摘在现代通信网络中,各节点设备之间需要高精度的时钟同步来达到硬实时的能力。高精度的时钟同步需要网络中交换机等传输设备支持精确时间同步协议。PTP精确时间协议(Precision Time Protocol)是一种高精度时间同步协议,在网络中通过同步信号周期性对所有节点时钟校正。PTP一般在硬件级实现,能够达到纳秒级别,是现代通信网络中常用的时钟同步协议。
基金supported by "the Hundred Talents Program," the Knowledge Innovative Key Program of the Chinese Academy of Sciences (54Y154761O01076 and Y329631O0263) to Z.C.the National Natural Science Foundation of China (31200194)+1 种基金the outstanding young talent program of Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture (Y352811O03)Youth Innovation Promotion Association of the Chinese Academy of Sciences to H.S.
文摘As an important second messenger, calcium is involved in plant cold stress response, including chilling（〈20 °C） and freezing（〈0 °C）. In this study, exogenous application of calcium chloride（CaCl2） improved both chilling and freezing stress tolerances, while ethylene glycol‐bis‐（b‐aminoethyl） ether‐N,N,N,N‐tetraacetic acid（EGTA） reversed CaCl2 effects in bermudagrass（Cynodon dactylon（L.） Pers.）.Pysiological analyses showed that CaCl2 treatment alleviated the reactive oxygen species（ROS） burst and cell damage triggered by chilling stress, via activating antioxidant enzymes,non‐enzymatic glutathione antioxidant pool, while EGTA treatment had the opposite effects. Additionally, comparative proteomic analysis identified 51 differentially expressed proteins that were enriched in redox, tricarboxylicacid cycle,glycolysis, photosynthesis, oxidative pentose phosphate pathway, and amino acid metabolisms. Consistently, 42 metabolites including amino acids, organic acids, sugars, and sugar alcohols were regulated by CaCl2 treatment under control and cold stress conditions, further confirming the Researchcommon modulation of CaCl2 treatment in carbon metabolites and amino acid metabolism. Taken together, this study reported first evidence of the essential and protective roles of endogenous and exogenous calcium in bermudagrass response to cold stress, partially via activation of the antioxidants and modulation of several differentially expressed proteins and metabolic homeostasis in the process of cold acclimation.
