The Cenozoic evolution history of Guizhou Province, which is located on the southeastern flank of the Qinghai-Tibet Plateau, is unclear because of the lack of sedimentation records. The red weathering crusts widesprea...The Cenozoic evolution history of Guizhou Province, which is located on the southeastern flank of the Qinghai-Tibet Plateau, is unclear because of the lack of sedimentation records. The red weathering crusts widespread on the Yunnan-Guizhou Plateau may bear critical information about their evolution history. This work firstly determined the ages of four red weathering crusts in eastern, central and northern Guizhou. The material used in fission track dating is well-crystallized quartz occurring in many in-situ weathering crusts of carbonate rocks. The results showed that the fission track ages of quartz vary over a wide range from 1 to 25 Ma in the four profiles, significantly younger than the ages of the Triassic and Cambrian parent rocks. In combination with the evolution history of the regional geology during the period from 25 to 1 Ma, the ages of quartz can exclude the possibility that the origin of quartz has nothing to do with primary clastic minerals in parent rocks, authigenesis during diagenesis and hydrothermal precipitation or roplacement by volcanic activities. It is deduced that the well-crystallized quartz was precipitated from Si-rich weathering fluids during the weathering process of carbonate rocks. The recorded ages of quartz from the four profiles are consistent with the episodes of the planation surfaces on the Qinghai-Tibet Plateau, the forming stages of red soil in the tropics of South China, the tectonically stable periods in Guizhou, and the ages of weathering in other parts of the world during the Cenozoic era. That is to say, the ages of authigenic quartz dated by the fission track method are well feasible and credible.展开更多
By using the digital observations of the pendulum tiltmeter, water tube tiltmeter,extensometer and volumetric strainmeter at Huzhou station and with the power spectrum density estimation method,we acquired the_0S_5-_0...By using the digital observations of the pendulum tiltmeter, water tube tiltmeter,extensometer and volumetric strainmeter at Huzhou station and with the power spectrum density estimation method,we acquired the_0S_5-_0S_50 fundamental sphere free oscillations caused by the Japan earthquake on March 11,2011,then compared it with the PREM model. The relative errors are mostly bigger than 1.2‰. The extensometer and volume strainmeter can clearly detect _0S_2,_0S_3and_0S_4,which are closely related to the deep structure and earth's interior.展开更多
I am an Australian living in Quanzhou, Fujian Province. I am employed as an English conversation teacher in a local middle school. I enjoy reading China Today and would be interested in writing an article on my impres...I am an Australian living in Quanzhou, Fujian Province. I am employed as an English conversation teacher in a local middle school. I enjoy reading China Today and would be interested in writing an article on my impression of Quanzhou, or my experiences as a teacher in middle school or other topics that may be of interest to your readers.展开更多
In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size...In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size).The data from measurements show that in the upper atmosphere the existence of an upper jet is important to the transition cyclone.When Mindulle moved to the area of the upper jet entrance,where high-altitude divergence existed, the pumping of the high-altitude divergence would enhance the vertical motion and low-level cyclone convergence. The enhanced vertical motion was confirmed by the simulation results and indicated that the existence of upper divergence enhanced the vertical motion which was favorable for the maintenance of Typhoon Mindulle.The process of extratropical transition (ET) and re-intensification always accompanies the process of cold air invasion. This process enhances the baroclinicity of the atmosphere and the formation of front at high altitudes, which converts baroclinic potential energy into kinetic energy and strengthens the cyclone vortex.The distributions of equivalent potential temperature (θe) and temperature anomalies show that the warm-core of the typhoon at the tropopause aids the re-intensification of the system. As the typhoon reenters the ocean, latent heat flux (LHF) increases in the north and west and the strong reflectivity and vertical motion occur in the east and southeast,and the west.With the re-intensification of the typhoon the wind field evolves from an oval to a circle at the lower atmosphere, the area coverage by high winds increases, and the distribution of the tangential wind shows an asymmetric pattern.展开更多
This paper is based on a study that was done to explore the perspectives of teacher candidates and faculty members of teacher education programs of a university of Arizona. The purpose of the study was to look into K-...This paper is based on a study that was done to explore the perspectives of teacher candidates and faculty members of teacher education programs of a university of Arizona. The purpose of the study was to look into K-12 language teacher education programs in the backdrop of globalization. The data of the study came from a sample of 200 prospective teachers/candidates and students, and 24 faculty members/program administrators of teacher education programs of a university of Arizona. The results of the study showed that the majority of teacher candidates felt underprepared to teach diverse student populations. Similarly, most participants expressed their concerns over English-only policy of Arizona and they reported it as a major barrier for the education of English language learners.展开更多
This paper investigates the effectiveness of closed captioning in aiding Saudi students who are learning ESL （English as a second language）. Research was carried out in a qualitative manner, and participants were 12...This paper investigates the effectiveness of closed captioning in aiding Saudi students who are learning ESL （English as a second language）. Research was carried out in a qualitative manner, and participants were 12 Saudi students pursuing their studies at Indiana University of Pennsylvania, USA （IUP）. Participants in the study were asked to compose a narrative after viewing a 5-minute film segment, both with and without captioning. Their responses were then analyzed, and results indicated that while captions may aid one in comprehension, they also tend to limit one＇s interpretations, reaffirming the nature of written language as an authoritative source of information.展开更多
基金This work was granted by the National Natural Science Foundation of China(Nos.40371012 and 49833002).
文摘The Cenozoic evolution history of Guizhou Province, which is located on the southeastern flank of the Qinghai-Tibet Plateau, is unclear because of the lack of sedimentation records. The red weathering crusts widespread on the Yunnan-Guizhou Plateau may bear critical information about their evolution history. This work firstly determined the ages of four red weathering crusts in eastern, central and northern Guizhou. The material used in fission track dating is well-crystallized quartz occurring in many in-situ weathering crusts of carbonate rocks. The results showed that the fission track ages of quartz vary over a wide range from 1 to 25 Ma in the four profiles, significantly younger than the ages of the Triassic and Cambrian parent rocks. In combination with the evolution history of the regional geology during the period from 25 to 1 Ma, the ages of quartz can exclude the possibility that the origin of quartz has nothing to do with primary clastic minerals in parent rocks, authigenesis during diagenesis and hydrothermal precipitation or roplacement by volcanic activities. It is deduced that the well-crystallized quartz was precipitated from Si-rich weathering fluids during the weathering process of carbonate rocks. The recorded ages of quartz from the four profiles are consistent with the episodes of the planation surfaces on the Qinghai-Tibet Plateau, the forming stages of red soil in the tropics of South China, the tectonically stable periods in Guizhou, and the ages of weathering in other parts of the world during the Cenozoic era. That is to say, the ages of authigenic quartz dated by the fission track method are well feasible and credible.
基金funded by the“Three-in-One”subject of China Earthquake Administration(201324)the Science and Technology Projects of Earthquake Administration of Zhejiang Province(2015ZJJ03)
文摘By using the digital observations of the pendulum tiltmeter, water tube tiltmeter,extensometer and volumetric strainmeter at Huzhou station and with the power spectrum density estimation method,we acquired the_0S_5-_0S_50 fundamental sphere free oscillations caused by the Japan earthquake on March 11,2011,then compared it with the PREM model. The relative errors are mostly bigger than 1.2‰. The extensometer and volume strainmeter can clearly detect _0S_2,_0S_3and_0S_4,which are closely related to the deep structure and earth's interior.
文摘I am an Australian living in Quanzhou, Fujian Province. I am employed as an English conversation teacher in a local middle school. I enjoy reading China Today and would be interested in writing an article on my impression of Quanzhou, or my experiences as a teacher in middle school or other topics that may be of interest to your readers.
基金supported by the National Natural Science Foundation of China(Nos.40876004,40890155 and 40675060)National 973 Project(Nos.2009CB-421500 and 2007CB411801)
文摘In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size).The data from measurements show that in the upper atmosphere the existence of an upper jet is important to the transition cyclone.When Mindulle moved to the area of the upper jet entrance,where high-altitude divergence existed, the pumping of the high-altitude divergence would enhance the vertical motion and low-level cyclone convergence. The enhanced vertical motion was confirmed by the simulation results and indicated that the existence of upper divergence enhanced the vertical motion which was favorable for the maintenance of Typhoon Mindulle.The process of extratropical transition (ET) and re-intensification always accompanies the process of cold air invasion. This process enhances the baroclinicity of the atmosphere and the formation of front at high altitudes, which converts baroclinic potential energy into kinetic energy and strengthens the cyclone vortex.The distributions of equivalent potential temperature (θe) and temperature anomalies show that the warm-core of the typhoon at the tropopause aids the re-intensification of the system. As the typhoon reenters the ocean, latent heat flux (LHF) increases in the north and west and the strong reflectivity and vertical motion occur in the east and southeast,and the west.With the re-intensification of the typhoon the wind field evolves from an oval to a circle at the lower atmosphere, the area coverage by high winds increases, and the distribution of the tangential wind shows an asymmetric pattern.
文摘This paper is based on a study that was done to explore the perspectives of teacher candidates and faculty members of teacher education programs of a university of Arizona. The purpose of the study was to look into K-12 language teacher education programs in the backdrop of globalization. The data of the study came from a sample of 200 prospective teachers/candidates and students, and 24 faculty members/program administrators of teacher education programs of a university of Arizona. The results of the study showed that the majority of teacher candidates felt underprepared to teach diverse student populations. Similarly, most participants expressed their concerns over English-only policy of Arizona and they reported it as a major barrier for the education of English language learners.
文摘This paper investigates the effectiveness of closed captioning in aiding Saudi students who are learning ESL （English as a second language）. Research was carried out in a qualitative manner, and participants were 12 Saudi students pursuing their studies at Indiana University of Pennsylvania, USA （IUP）. Participants in the study were asked to compose a narrative after viewing a 5-minute film segment, both with and without captioning. Their responses were then analyzed, and results indicated that while captions may aid one in comprehension, they also tend to limit one＇s interpretations, reaffirming the nature of written language as an authoritative source of information.
