用ICP-MS对取自Juan de Fuca洋脊Endeavour段5块热液硫化物样品的13个分析样进行了稀土元素(REE)测试。结果显示该区硫化物样品的REE含量较低(0.35～14.8μg/g),所有样品的REE球粒陨石标准化分布模式均表现出Eu正异常和LREE富集的特征,...用ICP-MS对取自Juan de Fuca洋脊Endeavour段5块热液硫化物样品的13个分析样进行了稀土元素(REE)测试。结果显示该区硫化物样品的REE含量较低(0.35～14.8μg/g),所有样品的REE球粒陨石标准化分布模式均表现出Eu正异常和LREE富集的特征,表明硫化物中的REE来自热液。不同喷口硫化物的REE含量变化较大,同一块状硫化物不同部位的含量也有较大差异,主要是由于硫化物形成过程中,热液和海水的混合不均一性以及不同矿物沉淀和(或)溶解的结果。硫化物REE的分布特征主要受热液的影响,烟囱内外层Eu正异常的变化主要受矿物组成和物理化学条件的控制。展开更多
作为EMSLAB电磁感应国际合作计划的一部分,通过对海底观测的三分量变化地磁场的分析,构制了横跨Juan de Fuca洋脊、Juan de Fuca板块到板块俯冲带的三条地磁转换函数剖面,计算了各个测点的地磁场感应矢量。结果表明,Juan de Fuca板块的...作为EMSLAB电磁感应国际合作计划的一部分,通过对海底观测的三分量变化地磁场的分析,构制了横跨Juan de Fuca洋脊、Juan de Fuca板块到板块俯冲带的三条地磁转换函数剖面,计算了各个测点的地磁场感应矢量。结果表明,Juan de Fuca板块的东、西两部分的浅部电性结构是有差异的,近海岸线的东区更导电;而深部电性结构是相对均匀的。这一结果与由大地电磁资料计算得到的二维模型剖面是一致的。展开更多
本研究做为电磁感应国际合作研究项目—EMSLAB计划的一部分,主要目的在于确定东太平洋年轻的海洋板块——Juan de Fuca板块及其周围地区岩石圈和软流圈的电性结构。 在对海底观测的大地电磁资料定性和定量分析的基础上,进行了二维数学...本研究做为电磁感应国际合作研究项目—EMSLAB计划的一部分,主要目的在于确定东太平洋年轻的海洋板块——Juan de Fuca板块及其周围地区岩石圈和软流圈的电性结构。 在对海底观测的大地电磁资料定性和定量分析的基础上,进行了二维数学模拟。在二维模型中,海洋地形和已知的表层构造被确定。通过改变模型的重要参数,评价响应函数和观测资料之间偏差的增加,检验模型的可靠性。结果表明,Juan de Fuca板块深部存在两个导电层,一个在40km,另一个在200km左右。这里岩石圈比其它较老板块的岩石圈薄。展开更多
热液羽流的扩散过程常常记录于其下的热液沉积物中。研究热液羽流的沉积学记录有利于在现代洋底寻索所动热液喷口的位置,甚至还可为陆地类似成因矿床的发现提供有价值的线索。本文报道了来自Juan de Fuca洋脊(Jd FR)Endeavour段的8个按...热液羽流的扩散过程常常记录于其下的热液沉积物中。研究热液羽流的沉积学记录有利于在现代洋底寻索所动热液喷口的位置,甚至还可为陆地类似成因矿床的发现提供有价值的线索。本文报道了来自Juan de Fuca洋脊(Jd FR)Endeavour段的8个按规律采样的羽流末端沉积物样品的矿物学和地球化学分析结果。分步化学淋滤结果表明,热液来源物质直接对于该沉积物的贡献最少为23.03–33.展开更多
为了改善PLC课堂的教学效果,将Juan Luis Villanueva仿真软件用于S7-200PLC课程的日常教学。首先对Juan Luis Villanueva仿真软件做了简单介绍,之后通过实现四台电机顺序启动同时停止的例子介绍了使用仿真软件的教学过程,最后简要说明...为了改善PLC课堂的教学效果,将Juan Luis Villanueva仿真软件用于S7-200PLC课程的日常教学。首先对Juan Luis Villanueva仿真软件做了简单介绍,之后通过实现四台电机顺序启动同时停止的例子介绍了使用仿真软件的教学过程,最后简要说明了采用仿真软件在PLC教学中的优势。展开更多
Hurricane Juan provides an excellent opportunity to probe into the detailed wave spectral patterns and spectral parameters of a hurricane system, with enough wave spectral observations around Juan＇s track in the deep...Hurricane Juan provides an excellent opportunity to probe into the detailed wave spectral patterns and spectral parameters of a hurricane system, with enough wave spectral observations around Juan＇s track in the deep ocean and shallow coastal water. In this study, Hurricane Juan and wave observation stations around Juan＇s track are introduced. Variations of wave composition are discussed and analyzed based on time series of one-dimensional frequency spectra, as well as wave steepness around Juan＇s track： before, during, and after Juan＇s passing. Wave spectral involvement is studied based on the observed one-dimensional spectra and two-dimensional spectra during the hurricane. The standardization method of the observed wave spectra during Hurricane Juan is discussed, and the standardized spectra show relatively conservative behavior, in spite of the huge variation in wave spectral energy, spectral peak, and peak frequency during this hurricane. Spectral widths＇ variation during Hurricane Juan are calculated and analyzed. A two-layer nesting WW3 model simulation is applied to simulate the one-dimensional and two-dimensional wave spectra, in order to examine WW3＇s ability in simulating detailed wave structure during Hurricane Juan.展开更多
New LIDAR （Light Detection and Ranging） and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly v...New LIDAR （Light Detection and Ranging） and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly visible on LIDAR and sonar images. Many previously unknown faults criss-cross the islands and large fault scarps are visible on sonar imagery along the margins of the larger islands. Sonar images of sea floor morphology show many submerged faults as long linear scarps with relief up to 300m （1,000 fl）, some of which visibly truncate geologic structures. The San Juan Lopez fault, the largest fault in the islands, extends for at least 65 km （40 mi） from Stuart Island to Rosario strait with a scarp up to 330m （1,000 it） high. Since 1975, the basic structural framework of the San Juan Islands has been considered to consist of five stacked thrust faults, the Rosario, Orcas, Haro, Lopez, and Buck Bay faults, constituting the San Juan Thrust （Nappe） System that has shuffled together far distant terranes. However, the new LIDAR and sonar imagery shows that most of the mapped extent of these postulated faults are actually segments of high angle, dipslip faults and are not thrust faults at all. Thus, the San Juan Thrust （Nappe） System does not exist. The age of these faults is not accurately known and more than one period of high angle faulting may have occurred. Faults shown on L1DAR images of the surface of the islands appear as visible gashes, etched out by erosion of fault zones with few fault scarps. However, the sea floor faults have bold relief and high scarps. A late Pleistocene moraine lies undisturbed across the San Juan Lopez fault.展开更多
Most people explain“Nei Juan”based on the connotation of the“Involution”and other fierce competition outlined above.However,the misunderstanding of the term triggers adverse social anxiety and stigmatizes reasonab...Most people explain“Nei Juan”based on the connotation of the“Involution”and other fierce competition outlined above.However,the misunderstanding of the term triggers adverse social anxiety and stigmatizes reasonable education ideas.The result of“Nei Juan”is that everyone screws more effort to expect the raised standard,but no one yields better returns due to the fixed resources.The essay related to the education-oriented examination in China reveals the adverse effects of“Nei Juan,”focuses on why the public misunderstand the“Nei Juan”as involution and distinguishes it from the positive competition.Understanding the term’s connotation is responsible for helping those escaping from the futile effort and relaxing from the rat race.展开更多
Byron's works are often considered as being cynical and tragic due to their famous Byronic heroes—often defiant, melan-choly young men as well as Byron's rebellious life experience. However, Don Juan has alre...Byron's works are often considered as being cynical and tragic due to their famous Byronic heroes—often defiant, melan-choly young men as well as Byron's rebellious life experience. However, Don Juan has already grown out of such tragic mood andself-pitying pride. In Don Juan, contrary to the serious and complete negation, the satire is ambivalent just like the medieval carni-val laughter which is deriding and downgrading as well as positive and regenerating. With the help of the Bakhtin's theory aboutthe medieval carnival, Don Juan proved to be an affirmative poem with positive sense. Byron in this poem gives a true revelation ofpassionate mutual love, shows the importance of personal and national liberty, and expands people's perception of morality as hesatires and laughs at the vices of the society.展开更多
文摘用ICP-MS对取自Juan de Fuca洋脊Endeavour段5块热液硫化物样品的13个分析样进行了稀土元素(REE)测试。结果显示该区硫化物样品的REE含量较低(0.35～14.8μg/g),所有样品的REE球粒陨石标准化分布模式均表现出Eu正异常和LREE富集的特征,表明硫化物中的REE来自热液。不同喷口硫化物的REE含量变化较大,同一块状硫化物不同部位的含量也有较大差异,主要是由于硫化物形成过程中,热液和海水的混合不均一性以及不同矿物沉淀和(或)溶解的结果。硫化物REE的分布特征主要受热液的影响,烟囱内外层Eu正异常的变化主要受矿物组成和物理化学条件的控制。
文摘作为EMSLAB电磁感应国际合作计划的一部分,通过对海底观测的三分量变化地磁场的分析,构制了横跨Juan de Fuca洋脊、Juan de Fuca板块到板块俯冲带的三条地磁转换函数剖面,计算了各个测点的地磁场感应矢量。结果表明,Juan de Fuca板块的东、西两部分的浅部电性结构是有差异的,近海岸线的东区更导电;而深部电性结构是相对均匀的。这一结果与由大地电磁资料计算得到的二维模型剖面是一致的。
文摘本研究做为电磁感应国际合作研究项目—EMSLAB计划的一部分,主要目的在于确定东太平洋年轻的海洋板块——Juan de Fuca板块及其周围地区岩石圈和软流圈的电性结构。 在对海底观测的大地电磁资料定性和定量分析的基础上,进行了二维数学模拟。在二维模型中,海洋地形和已知的表层构造被确定。通过改变模型的重要参数,评价响应函数和观测资料之间偏差的增加,检验模型的可靠性。结果表明,Juan de Fuca板块深部存在两个导电层,一个在40km,另一个在200km左右。这里岩石圈比其它较老板块的岩石圈薄。
文摘热液羽流的扩散过程常常记录于其下的热液沉积物中。研究热液羽流的沉积学记录有利于在现代洋底寻索所动热液喷口的位置,甚至还可为陆地类似成因矿床的发现提供有价值的线索。本文报道了来自Juan de Fuca洋脊(Jd FR)Endeavour段的8个按规律采样的羽流末端沉积物样品的矿物学和地球化学分析结果。分步化学淋滤结果表明,热液来源物质直接对于该沉积物的贡献最少为23.03–33.
文摘为了改善PLC课堂的教学效果,将Juan Luis Villanueva仿真软件用于S7-200PLC课程的日常教学。首先对Juan Luis Villanueva仿真软件做了简单介绍,之后通过实现四台电机顺序启动同时停止的例子介绍了使用仿真软件的教学过程,最后简要说明了采用仿真软件在PLC教学中的优势。
基金The National Natural Science Foundation of China under contract No.50779015the National Key Technology R&D Program of China under contract No.2012BAB03B01
文摘Hurricane Juan provides an excellent opportunity to probe into the detailed wave spectral patterns and spectral parameters of a hurricane system, with enough wave spectral observations around Juan＇s track in the deep ocean and shallow coastal water. In this study, Hurricane Juan and wave observation stations around Juan＇s track are introduced. Variations of wave composition are discussed and analyzed based on time series of one-dimensional frequency spectra, as well as wave steepness around Juan＇s track： before, during, and after Juan＇s passing. Wave spectral involvement is studied based on the observed one-dimensional spectra and two-dimensional spectra during the hurricane. The standardization method of the observed wave spectra during Hurricane Juan is discussed, and the standardized spectra show relatively conservative behavior, in spite of the huge variation in wave spectral energy, spectral peak, and peak frequency during this hurricane. Spectral widths＇ variation during Hurricane Juan are calculated and analyzed. A two-layer nesting WW3 model simulation is applied to simulate the one-dimensional and two-dimensional wave spectra, in order to examine WW3＇s ability in simulating detailed wave structure during Hurricane Juan.
文摘New LIDAR （Light Detection and Ranging） and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly visible on LIDAR and sonar images. Many previously unknown faults criss-cross the islands and large fault scarps are visible on sonar imagery along the margins of the larger islands. Sonar images of sea floor morphology show many submerged faults as long linear scarps with relief up to 300m （1,000 fl）, some of which visibly truncate geologic structures. The San Juan Lopez fault, the largest fault in the islands, extends for at least 65 km （40 mi） from Stuart Island to Rosario strait with a scarp up to 330m （1,000 it） high. Since 1975, the basic structural framework of the San Juan Islands has been considered to consist of five stacked thrust faults, the Rosario, Orcas, Haro, Lopez, and Buck Bay faults, constituting the San Juan Thrust （Nappe） System that has shuffled together far distant terranes. However, the new LIDAR and sonar imagery shows that most of the mapped extent of these postulated faults are actually segments of high angle, dipslip faults and are not thrust faults at all. Thus, the San Juan Thrust （Nappe） System does not exist. The age of these faults is not accurately known and more than one period of high angle faulting may have occurred. Faults shown on L1DAR images of the surface of the islands appear as visible gashes, etched out by erosion of fault zones with few fault scarps. However, the sea floor faults have bold relief and high scarps. A late Pleistocene moraine lies undisturbed across the San Juan Lopez fault.
文摘Most people explain“Nei Juan”based on the connotation of the“Involution”and other fierce competition outlined above.However,the misunderstanding of the term triggers adverse social anxiety and stigmatizes reasonable education ideas.The result of“Nei Juan”is that everyone screws more effort to expect the raised standard,but no one yields better returns due to the fixed resources.The essay related to the education-oriented examination in China reveals the adverse effects of“Nei Juan,”focuses on why the public misunderstand the“Nei Juan”as involution and distinguishes it from the positive competition.Understanding the term’s connotation is responsible for helping those escaping from the futile effort and relaxing from the rat race.
文摘Byron's works are often considered as being cynical and tragic due to their famous Byronic heroes—often defiant, melan-choly young men as well as Byron's rebellious life experience. However, Don Juan has already grown out of such tragic mood andself-pitying pride. In Don Juan, contrary to the serious and complete negation, the satire is ambivalent just like the medieval carni-val laughter which is deriding and downgrading as well as positive and regenerating. With the help of the Bakhtin's theory aboutthe medieval carnival, Don Juan proved to be an affirmative poem with positive sense. Byron in this poem gives a true revelation ofpassionate mutual love, shows the importance of personal and national liberty, and expands people's perception of morality as hesatires and laughs at the vices of the society.
