Climate variability over the Himalayan region has been attracting the attention of palaeoclimatologists on a wide range of time scales. In the context of slow changes in the contemporary time frame, it is of great rel...Climate variability over the Himalayan region has been attracting the attention of palaeoclimatologists on a wide range of time scales. In the context of slow changes in the contemporary time frame, it is of great relevance to understand the nature of decadal to century scale variations of the climate. In view of the sparse network of instrumental records, out of which only a handful extend to about 100 years, we have to depend on natural archives such as tree rings to reconstruct the past climatic variations over the region. Fortunately, large parts of the Himalayas are covered by extensive conifer forests, which have great potential for high\|resolution (interannual) dendroclimatic reconstructions, at least over the past 5 to 6 centuries. These conifers include genera such as Abies, Picea, Cedrus, Pinus etc., which have displayed great age, distinct annual growth rings and high sensitivity to atmospheric environment. Properly cross\|matched variations in the tree\|ring characteristics like width, density etc. can be used to reconstruct major climatic events during the last few centuries.展开更多
In cross-cultural theaters of the drama field,it has become a universal trend to integrate tradition and modernity as well as China and the West in the cultural exchange between different nations.Such a normality brin...In cross-cultural theaters of the drama field,it has become a universal trend to integrate tradition and modernity as well as China and the West in the cultural exchange between different nations.Such a normality brings some new opportunities to the dramatic creation of youth directors while posing greater challenges.As to opportunities,it can make the stage processing of directors more distinctive while enriching their aesthetic pursuits;the challenge lies in how to endow the work with contemporary expression without breaking away from tradition.Nowadays,more and more directors are seeking“poetic reconstruction”in cross-cultural theaters,and keen direction artists are exploring how to better express the connotation of their work,including the inner feelings of roles,their subconsciousness,and transmitting the unfinished meaningful words delicately at the special time and space offered by the stage,and make use of the unique vocabulary of directors to form new aesthetic experience and expressive effects,so as to enlighten the audience to make rational reflection in addition to having emotional consonance.Therefore,“poetic reconstruction of‘self-centered’”is critical in cross-cultural theatrical creation.In view of this condition,I will take the creation of Xi,an experimental drama,as an example,and discuss how directors reconstruct“self-centered”poetry in the cross-cultural theaters to form distinctive and unique expressions,so as to accomplish beneficial exploration of the co-existence of philosophy and beauty in the combination of classicism and contemporaneity and the process of taking in everything.展开更多
A scanning t-test algorithm for detecting multiple time-scale abrupt changes in the level of a time-series was used to analyze an 8000 year time series of annual precipitation which was reconstructed from tree rings f...A scanning t-test algorithm for detecting multiple time-scale abrupt changes in the level of a time-series was used to analyze an 8000 year time series of annual precipitation which was reconstructed from tree rings for the Nevada Climate Division 3 in the western USA. The tree ring samples were gathered from eight states in the southwestern USA. Twenty-two change-points were identified by the algorithm and these were used to partition the tree-ring series into twenty-three relatively Wet/Normal/Dry episodes. These twenty-three episodes were collaborated by a coherency analysis of abrupt changes between the precipitation reconstruction series and the TIC/δ^18O records from cored sediments of Pyramid Lake in Nevada, and by comparison with published results from related studies. These episodes were also compared with studies of the global climate change and with records of climate change in China during the same periods. The results suggest that the precipitation reconstruction series is quite valuable for climate-change research on multi-centurial time-scales in the western USA, and that the scanning t-test and coherency detection algorithms may have a wide use for detecting multiple time-scale abrupt changes in a long time series. As the TIC and δ^18O record series are high resolution with unequal sampling intervals ranging between 3 and 14 years, a new algorithm was developed to deal with the unequal time intervals in the series.展开更多
Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methan...Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methane,coal shale gas and coal measure tight sandstone gas)from single coalbed methane has greatly expanded the field and space of resource evaluation,which is of positive significance for realizing the comprehensive utilization of coal resources,maximizing the benefits and promoting the innovation of oil and gas geological theory and technological advances in exploration and development.For the first time,in Yangmeishu Syncline of Western Guizhou Province,the public welfare coalbed methane geological survey project of China Geological Survey has been carried out a systematic geological survey of coal measure gas for the Upper Permian Longtan Formation,identified the geological conditions of coal measure gas and found high quality resources.The total geological resource quantity of coalbed methane and coal shale gas is 51.423×109 m3 and the geological resource abundance is up to 566×106 m3/km2.In this area,the coal measures are characterized by many layers of minable coal seams,large total thickness,thin to the medium thickness of the single layer,good gas-bearing property of coal seams and coal measure mudstone and sandstone,good reservoir physical property and high-pressure coefficient.According to the principle of combination of high quality and similarity of key parameters of the coal reservoir,the most favorable intervals are No.5-2,No.7 and No.13-2 coal seam in Well YMC1.And the pilot tests are carried out on coal seams and roof silty mudstone,such as staged perforation,increasing hydraulic fracturing scale and"three gas"production.The high and stable industrial gas flow with a daily gas output of more than 4000 m3 has been obtained,which has realized the breakthrough in the geological survey of coal measure gas in Southwest China.Based on the above investigation results,the geological characteristics of coal measure gas in the multi-thin-coal-seam-developed area and the coexploration and co-production methods,such as the optimization method of favorable intervals,the highefficiency fracturing and reservoir reconstruction method of coal measures,and the"three gas"drainage and production system,are systematically summarized in this paper.It will provide a reference for efficient exploration and development of coal measure gas in similar geological conditions in China.展开更多
笔者在琼州海峡西口第四系松散沉积物中新发现碳酸盐胶结岩,通过生物碎屑AMS14C同位素定年、全岩X衍射定量分析、扫描电镜、阴极发光、全岩主微量元素地球化学测试等方法对其进行了年代学和成因研究。结果显示,碳酸盐胶结岩的成岩时代...笔者在琼州海峡西口第四系松散沉积物中新发现碳酸盐胶结岩,通过生物碎屑AMS14C同位素定年、全岩X衍射定量分析、扫描电镜、阴极发光、全岩主微量元素地球化学测试等方法对其进行了年代学和成因研究。结果显示,碳酸盐胶结岩的成岩时代为早—中全新世,具有等厚纤柱状环边胶结、重力悬挂胶结、马牙状胶结、(似)共轴增生胶结、非等轴胶结等5种胶结物特征;阴极发光环带具有广泛发育、环带密集,可见淡水和海水相互作用的咸淡水混合带,说明其成岩环境包括淡水渗流带、咸淡水混合带、海水渗流带、海水潜流带;结合其沉积主微量元素特征,其赋存层位的沉积环境为海岸沉积环境,滨岸沉积相障壁岛亚相,属于海滩岩。综合雷州半岛西南部灯楼角珊瑚礁的海平面记录,重建了全新世琼州海峡西口地区海平面演化历史:9.9~6.7 ka BP海侵期、6.7~6.2 ka BP海退期、6.2~4.2 ka BP海侵期和4.2 ka BP至今的稳定期等四个阶段。展开更多
Based on coral proxies we reconstructed the western Pacific warm pool sea surface temperature (SST) since 1644 AD. High-frequency reconstructions are based on eight high-pass filtered coral series and raw reconstructi...Based on coral proxies we reconstructed the western Pacific warm pool sea surface temperature (SST) since 1644 AD. High-frequency reconstructions are based on eight high-pass filtered coral series and raw reconstructions are derived from eight unfiltered coral series, respectively. Validation and comparison with other SST/temperature series show that the reconstructed warm pool SST is highly reliable. The leading periods of warm pool SST are ～2.1, ～2.3, ～2.9, ～3.6, ～3.8, and 80.7-year during the last ～360 years. The warm pool SST exhibits some obvious long-term trends: an upward trend of 0.04°C per century for the period of 1644–1825, while a decreasing trend of 0.24°C per century for the period of 1826–1885, and then a remarkable warming trend of 0.28°C per century taking place between 1886 and 2006. Especially, the SST shows the strongest trend of 0.67°C increase per century during the last 50 years, a warming unprecedented since 1644 AD. On interannual timescale, the connections between ENSO and the warm pool SST are robust during the reconstruction period. There are significant correlations between the warm pool SST and summer precipitation of the Yellow River basin and Huaihe River basin; the correlation coefficients are ?0.44 in reconstruction period (1880–1949 AD) and ?0.46 in instrumental period (1950–2005 AD) respectively. This relationship is also found between flood-drought index and the warm pool SST during the past 360 years, and their correlation coefficients are ?0.20 in reconstruction period and ?0.46 in instrumental period respectively, significant at the 0.01 level. On interdecadal timescale, this connection is more robust, and the correlation coefficient of the low-pass filtered components is ?0.42 during the whole period (1644–2000 AD). When the warm pool is warmer than normal, the precipitation is usually below the normal in the Yellow River and Huaihe River basin. On the contrary, when the warm pool is colder than the normal, there may be more precipitation. The reconstructed warm pool SSTs provide useful information and reference for further research on climate change mechanism in East China.展开更多
文摘Climate variability over the Himalayan region has been attracting the attention of palaeoclimatologists on a wide range of time scales. In the context of slow changes in the contemporary time frame, it is of great relevance to understand the nature of decadal to century scale variations of the climate. In view of the sparse network of instrumental records, out of which only a handful extend to about 100 years, we have to depend on natural archives such as tree rings to reconstruct the past climatic variations over the region. Fortunately, large parts of the Himalayas are covered by extensive conifer forests, which have great potential for high\|resolution (interannual) dendroclimatic reconstructions, at least over the past 5 to 6 centuries. These conifers include genera such as Abies, Picea, Cedrus, Pinus etc., which have displayed great age, distinct annual growth rings and high sensitivity to atmospheric environment. Properly cross\|matched variations in the tree\|ring characteristics like width, density etc. can be used to reconstruct major climatic events during the last few centuries.
文摘In cross-cultural theaters of the drama field,it has become a universal trend to integrate tradition and modernity as well as China and the West in the cultural exchange between different nations.Such a normality brings some new opportunities to the dramatic creation of youth directors while posing greater challenges.As to opportunities,it can make the stage processing of directors more distinctive while enriching their aesthetic pursuits;the challenge lies in how to endow the work with contemporary expression without breaking away from tradition.Nowadays,more and more directors are seeking“poetic reconstruction”in cross-cultural theaters,and keen direction artists are exploring how to better express the connotation of their work,including the inner feelings of roles,their subconsciousness,and transmitting the unfinished meaningful words delicately at the special time and space offered by the stage,and make use of the unique vocabulary of directors to form new aesthetic experience and expressive effects,so as to enlighten the audience to make rational reflection in addition to having emotional consonance.Therefore,“poetic reconstruction of‘self-centered’”is critical in cross-cultural theatrical creation.In view of this condition,I will take the creation of Xi,an experimental drama,as an example,and discuss how directors reconstruct“self-centered”poetry in the cross-cultural theaters to form distinctive and unique expressions,so as to accomplish beneficial exploration of the co-existence of philosophy and beauty in the combination of classicism and contemporaneity and the process of taking in everything.
基金N ational N atural Science Foundation of China, N o.40175027 the U niversity of H aw aii pursuant to N ationalO ceanic and A tm ospheric A dm inistration A w ard,N o.N A 67RJ0154
文摘A scanning t-test algorithm for detecting multiple time-scale abrupt changes in the level of a time-series was used to analyze an 8000 year time series of annual precipitation which was reconstructed from tree rings for the Nevada Climate Division 3 in the western USA. The tree ring samples were gathered from eight states in the southwestern USA. Twenty-two change-points were identified by the algorithm and these were used to partition the tree-ring series into twenty-three relatively Wet/Normal/Dry episodes. These twenty-three episodes were collaborated by a coherency analysis of abrupt changes between the precipitation reconstruction series and the TIC/δ^18O records from cored sediments of Pyramid Lake in Nevada, and by comparison with published results from related studies. These episodes were also compared with studies of the global climate change and with records of climate change in China during the same periods. The results suggest that the precipitation reconstruction series is quite valuable for climate-change research on multi-centurial time-scales in the western USA, and that the scanning t-test and coherency detection algorithms may have a wide use for detecting multiple time-scale abrupt changes in a long time series. As the TIC and δ^18O record series are high resolution with unequal sampling intervals ranging between 3 and 14 years, a new algorithm was developed to deal with the unequal time intervals in the series.
基金This study was supported by the China Geological Survey Projects(DD20160186,12120115008201)
文摘Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methane,coal shale gas and coal measure tight sandstone gas)from single coalbed methane has greatly expanded the field and space of resource evaluation,which is of positive significance for realizing the comprehensive utilization of coal resources,maximizing the benefits and promoting the innovation of oil and gas geological theory and technological advances in exploration and development.For the first time,in Yangmeishu Syncline of Western Guizhou Province,the public welfare coalbed methane geological survey project of China Geological Survey has been carried out a systematic geological survey of coal measure gas for the Upper Permian Longtan Formation,identified the geological conditions of coal measure gas and found high quality resources.The total geological resource quantity of coalbed methane and coal shale gas is 51.423×109 m3 and the geological resource abundance is up to 566×106 m3/km2.In this area,the coal measures are characterized by many layers of minable coal seams,large total thickness,thin to the medium thickness of the single layer,good gas-bearing property of coal seams and coal measure mudstone and sandstone,good reservoir physical property and high-pressure coefficient.According to the principle of combination of high quality and similarity of key parameters of the coal reservoir,the most favorable intervals are No.5-2,No.7 and No.13-2 coal seam in Well YMC1.And the pilot tests are carried out on coal seams and roof silty mudstone,such as staged perforation,increasing hydraulic fracturing scale and"three gas"production.The high and stable industrial gas flow with a daily gas output of more than 4000 m3 has been obtained,which has realized the breakthrough in the geological survey of coal measure gas in Southwest China.Based on the above investigation results,the geological characteristics of coal measure gas in the multi-thin-coal-seam-developed area and the coexploration and co-production methods,such as the optimization method of favorable intervals,the highefficiency fracturing and reservoir reconstruction method of coal measures,and the"three gas"drainage and production system,are systematically summarized in this paper.It will provide a reference for efficient exploration and development of coal measure gas in similar geological conditions in China.
文摘笔者在琼州海峡西口第四系松散沉积物中新发现碳酸盐胶结岩,通过生物碎屑AMS14C同位素定年、全岩X衍射定量分析、扫描电镜、阴极发光、全岩主微量元素地球化学测试等方法对其进行了年代学和成因研究。结果显示,碳酸盐胶结岩的成岩时代为早—中全新世,具有等厚纤柱状环边胶结、重力悬挂胶结、马牙状胶结、(似)共轴增生胶结、非等轴胶结等5种胶结物特征;阴极发光环带具有广泛发育、环带密集,可见淡水和海水相互作用的咸淡水混合带,说明其成岩环境包括淡水渗流带、咸淡水混合带、海水渗流带、海水潜流带;结合其沉积主微量元素特征,其赋存层位的沉积环境为海岸沉积环境,滨岸沉积相障壁岛亚相,属于海滩岩。综合雷州半岛西南部灯楼角珊瑚礁的海平面记录,重建了全新世琼州海峡西口地区海平面演化历史:9.9~6.7 ka BP海侵期、6.7~6.2 ka BP海退期、6.2~4.2 ka BP海侵期和4.2 ka BP至今的稳定期等四个阶段。
基金Supported by National Key Technology Research and Development Program (Grant No. 2007BAC29B02) Special Fund for Public Welfare Industry (Meteorology, Grant No. GYHY200706010)
文摘Based on coral proxies we reconstructed the western Pacific warm pool sea surface temperature (SST) since 1644 AD. High-frequency reconstructions are based on eight high-pass filtered coral series and raw reconstructions are derived from eight unfiltered coral series, respectively. Validation and comparison with other SST/temperature series show that the reconstructed warm pool SST is highly reliable. The leading periods of warm pool SST are ～2.1, ～2.3, ～2.9, ～3.6, ～3.8, and 80.7-year during the last ～360 years. The warm pool SST exhibits some obvious long-term trends: an upward trend of 0.04°C per century for the period of 1644–1825, while a decreasing trend of 0.24°C per century for the period of 1826–1885, and then a remarkable warming trend of 0.28°C per century taking place between 1886 and 2006. Especially, the SST shows the strongest trend of 0.67°C increase per century during the last 50 years, a warming unprecedented since 1644 AD. On interannual timescale, the connections between ENSO and the warm pool SST are robust during the reconstruction period. There are significant correlations between the warm pool SST and summer precipitation of the Yellow River basin and Huaihe River basin; the correlation coefficients are ?0.44 in reconstruction period (1880–1949 AD) and ?0.46 in instrumental period (1950–2005 AD) respectively. This relationship is also found between flood-drought index and the warm pool SST during the past 360 years, and their correlation coefficients are ?0.20 in reconstruction period and ?0.46 in instrumental period respectively, significant at the 0.01 level. On interdecadal timescale, this connection is more robust, and the correlation coefficient of the low-pass filtered components is ?0.42 during the whole period (1644–2000 AD). When the warm pool is warmer than normal, the precipitation is usually below the normal in the Yellow River and Huaihe River basin. On the contrary, when the warm pool is colder than the normal, there may be more precipitation. The reconstructed warm pool SSTs provide useful information and reference for further research on climate change mechanism in East China.
