7月11日,适逢Savant在上海举办'智享生活交流会',《家庭影院技术》杂志有幸采访到专程自美国赶来的Savant国际销售总监Trevor de Maat先生,请他就Savant的市场现状、中国战略以及智能家居行业的发展等谈了自己的看法。以下是经...7月11日,适逢Savant在上海举办'智享生活交流会',《家庭影院技术》杂志有幸采访到专程自美国赶来的Savant国际销售总监Trevor de Maat先生,请他就Savant的市场现状、中国战略以及智能家居行业的发展等谈了自己的看法。以下是经编辑后的受访内容。自定义设置,让用户成为智能家居的主导美国是全球最大的智能家居市场,也是Savant最成熟和最重要的市场。展开更多
Quantum Physics (QP) was invented in the early years of the Twentieth century by physicists born and educated in the western world. We examine the possibility that this is the main reason—or at least one of the main ...Quantum Physics (QP) was invented in the early years of the Twentieth century by physicists born and educated in the western world. We examine the possibility that this is the main reason—or at least one of the main reasons—which caused QP to go astray from the start. We present the ABC for a renovated Quantum Physics.展开更多
为深入了解bGDGTs化合物对温度的响应是否受季节性变化和pH差异的影响,我们对中国多个偏碱性土壤bGDGTs化合物进行为期一年的观测.研究结果表明:在一年内,bGDGTs的组成对温度的响应是长期积累的结果,并不能反映短期(季节)的温度变化.寒...为深入了解bGDGTs化合物对温度的响应是否受季节性变化和pH差异的影响,我们对中国多个偏碱性土壤bGDGTs化合物进行为期一年的观测.研究结果表明:在一年内,bGDGTs的组成对温度的响应是长期积累的结果,并不能反映短期(季节)的温度变化.寒冷的青藏高原高海拔地区b GDGTs指标可能反映了春季/夏季过渡阶段的温度;而其他区域bGDGTs的分布和指标均未呈现明显的季节性特征.土壤pH是造成不同校正公式斜率差异的最主要原因,不同pH条件下,MBT指标对温度的响应存在显著差异.在中国中性-偏碱性土壤中,MBT指标与年均大气温度MAAT(5~25?C)的关系为:MAAT=20.78×MBT+5.92(R2=0.88, p <0.001).该校正公式在中性-偏碱性土壤环境中比之前的MBT-MAAT校正公式更精确,为反演中国区域古温度提供理论依据.展开更多
The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers(br GDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization...The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers(br GDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization degrees of br GDGTs, expressed as MBT and CBT, respectively, are reported to be mainly controlled by mean annual air temperature(MAAT) and soil p H. However, the br GDGT-derived temperatures and soil p H scatter widely when data from different environmental conditions are considered. In this study, we collected over 300 soil samples from China, which are representative of humid(Xishuangbanna, Guangzhou, and Shanghai), semi-arid(Dongying) and semi-arid/arid(Lanzhou, Tibetan Plateau) regions. Collectively we have the most extensive dataset that broadly characterizes the distribution of br GDGTs according to climate zones in China. The overall data demonstrate that the MBT/CBT derived temperatures better match the measured MAATs in humid and non-alkaline regions than those from regions of low MAP(<400 mm/yr) and above neutral soil p H(>7.0–7.5). Similarly, CBT describes soil p H much better in humid and non-alkaline soils than in semi-arid/arid and alkaline soils; the semi-arid/arid and alkaline soils tend to show a positive correlation between soil p H and CBT, which contradicts that in the humid and non-alkaline soils. While soil p H, MAAT and mean annual precipitation(MAP) are dominating factors controlling the br GDGT distribution across all climate zones, conductivity, total organic carbon and total nitrogen, as well as soil water content can also play an important role locally. Removing br GDGT-II resulted in a revised CBT index that provides more accurate estimation of p H, especially in semi-arid/arid and alkaline soils. The overall Chinese dataset demonstrates that continental air temperature derived from br GDGT-proxies can vastly deviate from real measurements and should be used with extreme caution in paleo-climate or-environment studies.展开更多
文摘7月11日,适逢Savant在上海举办'智享生活交流会',《家庭影院技术》杂志有幸采访到专程自美国赶来的Savant国际销售总监Trevor de Maat先生,请他就Savant的市场现状、中国战略以及智能家居行业的发展等谈了自己的看法。以下是经编辑后的受访内容。自定义设置,让用户成为智能家居的主导美国是全球最大的智能家居市场,也是Savant最成熟和最重要的市场。
文摘Quantum Physics (QP) was invented in the early years of the Twentieth century by physicists born and educated in the western world. We examine the possibility that this is the main reason—or at least one of the main reasons—which caused QP to go astray from the start. We present the ABC for a renovated Quantum Physics.
基金supported by National Natural Science Foundation of China Projects (No. 41471359)the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2016375)the Chinese Academy of Sciences Action Plan for West Development Project "Remote Sensing Data Products in the Heihe River Basin: Algorithm Development, Data Products Generation and Application Experiments" (No. KZCX2-XB3-15)
文摘permafrost;;mean annual air temperature(MAAT);;air temperature;;reanalysis;;thermal
文摘为深入了解bGDGTs化合物对温度的响应是否受季节性变化和pH差异的影响,我们对中国多个偏碱性土壤bGDGTs化合物进行为期一年的观测.研究结果表明:在一年内,bGDGTs的组成对温度的响应是长期积累的结果,并不能反映短期(季节)的温度变化.寒冷的青藏高原高海拔地区b GDGTs指标可能反映了春季/夏季过渡阶段的温度;而其他区域bGDGTs的分布和指标均未呈现明显的季节性特征.土壤pH是造成不同校正公式斜率差异的最主要原因,不同pH条件下,MBT指标对温度的响应存在显著差异.在中国中性-偏碱性土壤中,MBT指标与年均大气温度MAAT(5~25?C)的关系为:MAAT=20.78×MBT+5.92(R2=0.88, p <0.001).该校正公式在中性-偏碱性土壤环境中比之前的MBT-MAAT校正公式更精确,为反演中国区域古温度提供理论依据.
基金supported by the National Natural Science Foundation of China(Grant Nos.41373072 and 40873011)Shanghai Bureau of Science and Technology(Grant No.13JC1405200)the National Thousand Talents Program through the State Key Laboratory of Marine Geology at Tongji University
文摘The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers(br GDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization degrees of br GDGTs, expressed as MBT and CBT, respectively, are reported to be mainly controlled by mean annual air temperature(MAAT) and soil p H. However, the br GDGT-derived temperatures and soil p H scatter widely when data from different environmental conditions are considered. In this study, we collected over 300 soil samples from China, which are representative of humid(Xishuangbanna, Guangzhou, and Shanghai), semi-arid(Dongying) and semi-arid/arid(Lanzhou, Tibetan Plateau) regions. Collectively we have the most extensive dataset that broadly characterizes the distribution of br GDGTs according to climate zones in China. The overall data demonstrate that the MBT/CBT derived temperatures better match the measured MAATs in humid and non-alkaline regions than those from regions of low MAP(<400 mm/yr) and above neutral soil p H(>7.0–7.5). Similarly, CBT describes soil p H much better in humid and non-alkaline soils than in semi-arid/arid and alkaline soils; the semi-arid/arid and alkaline soils tend to show a positive correlation between soil p H and CBT, which contradicts that in the humid and non-alkaline soils. While soil p H, MAAT and mean annual precipitation(MAP) are dominating factors controlling the br GDGT distribution across all climate zones, conductivity, total organic carbon and total nitrogen, as well as soil water content can also play an important role locally. Removing br GDGT-II resulted in a revised CBT index that provides more accurate estimation of p H, especially in semi-arid/arid and alkaline soils. The overall Chinese dataset demonstrates that continental air temperature derived from br GDGT-proxies can vastly deviate from real measurements and should be used with extreme caution in paleo-climate or-environment studies.
