With the reform of college English teaching, many new teaching methods have been applied to college English teaching. This article is based on constructivist theory to explore its application in college English teachi...With the reform of college English teaching, many new teaching methods have been applied to college English teaching. This article is based on constructivist theory to explore its application in college English teaching. Constructivism emphasizes student-centered, collaborative learning, self-learning and real learning environment. It emphasizes active leamers meaning construction.展开更多
Constructivism is an important branch of cognitive theory. It is a leading theory of education at the end of 20th century and the early 21th century. Language itself is a kind of social construct, learning a language ...Constructivism is an important branch of cognitive theory. It is a leading theory of education at the end of 20th century and the early 21th century. Language itself is a kind of social construct, learning a language is construct personal knowledge. Under the guidance of constructivist learning theory, English teaching has transformed into a student-centered self-construct mode. It created a new situation that students can receive the overall development and personality development through situation setting, collaborative learning and meaning construction.展开更多
The traditional English teaching methods are mainly based on teachers＇ words and students＇ listening type. Neither the quality of teaching can be guaranteed, nor are students＇ thinking ability and innovation develo...The traditional English teaching methods are mainly based on teachers＇ words and students＇ listening type. Neither the quality of teaching can be guaranteed, nor are students＇ thinking ability and innovation developed. To change this situation, many educators have done a lot of research and exploration from both theoretical and practical aspects, of which constructivist theory is one of main results. Constructivist theory emphasizes that leaming is a process of knowledge acquisition. Knowledge can not only get from teachers, but also requires learners to learn from others＇ help in some particular context, with the necessary leaming materials, and through a way of meaning construction. Besides, it has important reference and inspiration effects on discipline study and conducting educational research.展开更多
The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses fo...The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses for the Jinlongyan(JLY) granite in northwest Fujian Province, southeast China. LA–ICP–MS zircon U–Pb dating yielded a weighted average ^(206)Pb/^(238)U age of 224.1 ±3.3 Ma. The granite is mainly comprised of K-feldspar,plagioclase, quartz, biotite and minor amphibole. It is characterized by enrichments in Rb, Th, REEs(total REE = 295.1–694.3 ppm), and HFSEs(e.g., Zr = 289–520 ppm, Hf = 9.3–15.0 ppm, Y = 36.2–68.2 ppm) but depletions in Ba, Sr, Eu and Ti. The granite is metaluminous to weakly peraluminous and show a clear A-type granite geochemical signature with high SiO_2(70.89 wt%–75.76 wt%), total alkalis(Na_2O + K_2O = 7.51 wt%–8.72 wt%), Ga/Al ratios(10000 Ga/Al = 2.72–3.43). Insitu zircon Hf isotope analysis shows their eHf(t) values ranging from-7.2 to-3.2, with Mesoproterozoic T2DM ages(1308–1525 Ma). Whole-rock Nd isotope data show their eNd(t) values in the range of-9.5 to-9.1 and yield paleoproterozoic TDMages(1606–1985 Ma). These characteristics indicate that the JLY A-type granite magma was formed by the partial melting of Meso-Paleoproterozoic crust rocks in the Cathaysia Block. Our study of the JLY A-type granite, together with other Triassic A-type granitesin South China, defines an extensional environment in the late Triassic which probably was caused by the collision of the South China Block with Indochina Block.展开更多
Fear of crime varies considerably depending on its attitude towards environmental conditions. Sense of community and CPTED （crime prevention through environmental design） are believed to have an influence on fear of...Fear of crime varies considerably depending on its attitude towards environmental conditions. Sense of community and CPTED （crime prevention through environmental design） are believed to have an influence on fear of crime. This paper investigates the hypotheses of influences of CPTED on FOC （fear of crime） and SOC （sense of community）. A total of 171 respondents from the designated residential areas were involved in this study. The structural equation modeling technique was employed and the results indicate that CPTED has a direct influence on fear of crime and sense of community. However, no significant relationship was found between SOC and FOC.展开更多
The assembly of nanocrystals into ordered structures called supercrystals or superstructures has become a pivotal frontier owing to numerous useful applications such as correlating the arrangements of atoms in macrosc...The assembly of nanocrystals into ordered structures called supercrystals or superstructures has become a pivotal frontier owing to numerous useful applications such as correlating the arrangements of atoms in macroscopic crystals and tuning the collective properties to meet the demands of various applications. In this article, recent progress in the preparation of three-dimensional superlattices of nanocrystals is outlined, with a particular emphasis on the driving forces and evolutionary routes beyond orderly assembly. First, the leading or repulsive forces that internally and externally govern the formation of three-dimensional supercrystals are systematically identified and discussed with respect to their origins and functions in three-dimensional self-organization. Then a synoptic introduction of commonly applied means of nanocrystal self-assembly based on growth scenarios such as droplet evaporation and a liquid/liquid interface is presented with specific cases and detailed analyses. Finally, the existing challenges and prospects for this field are briefly highlighted.展开更多
The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instrume...The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instruments along the profile. Based on seismic facies analysis and travel-time picking on shot record sections, a model of the velocity structure of upper crust was developed by finite-difference tomography of the first breaks; the 2-D P-wave velocity structure and tectonic characteristics of the crust were interpreted further by fitting of waveforms and seismic travel times. The results show that the top of the crystal- line basement is buried at depths of 2.0-4.0 kin, with the deepest buried up to 4.0 km within the Fuzhou Basin. The Moho in- terface was found to be deeper in the west and shallower in the east （i.e., 30.0 km near the coast, increasing to 33.0 km north- westward）. The lower crust on the east side of the Zhenghe-Haifeng Fault Zone has a smoothly varying gradient structure, whereas on the west side it has two distinct layers with a boundary between those layers at a depth of 23 km. Seismic velocities on the west side are generally lower than on the east side; a low velocity layer is observed with a lowest speed of 6.25 km/s at a depth of 22 km on the west side, which may consist of partially molten material. The Zhenghe-Haifeng Fault is a deep crustal fault, and should be a channel for deep material upwelling; it has a direct relationship with multiple stages of continental tectonic movements in Southern China and with multiple magmatic events that started in the Proterozoic and ended in the of late Tertiary in Fujian.展开更多
文摘With the reform of college English teaching, many new teaching methods have been applied to college English teaching. This article is based on constructivist theory to explore its application in college English teaching. Constructivism emphasizes student-centered, collaborative learning, self-learning and real learning environment. It emphasizes active leamers meaning construction.
文摘Constructivism is an important branch of cognitive theory. It is a leading theory of education at the end of 20th century and the early 21th century. Language itself is a kind of social construct, learning a language is construct personal knowledge. Under the guidance of constructivist learning theory, English teaching has transformed into a student-centered self-construct mode. It created a new situation that students can receive the overall development and personality development through situation setting, collaborative learning and meaning construction.
文摘The traditional English teaching methods are mainly based on teachers＇ words and students＇ listening type. Neither the quality of teaching can be guaranteed, nor are students＇ thinking ability and innovation developed. To change this situation, many educators have done a lot of research and exploration from both theoretical and practical aspects, of which constructivist theory is one of main results. Constructivist theory emphasizes that leaming is a process of knowledge acquisition. Knowledge can not only get from teachers, but also requires learners to learn from others＇ help in some particular context, with the necessary leaming materials, and through a way of meaning construction. Besides, it has important reference and inspiration effects on discipline study and conducting educational research.
基金financially supported by the Chinese National Natural Science Foundation (41373024)Opening Foundation of State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences (201307)
文摘The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses for the Jinlongyan(JLY) granite in northwest Fujian Province, southeast China. LA–ICP–MS zircon U–Pb dating yielded a weighted average ^(206)Pb/^(238)U age of 224.1 ±3.3 Ma. The granite is mainly comprised of K-feldspar,plagioclase, quartz, biotite and minor amphibole. It is characterized by enrichments in Rb, Th, REEs(total REE = 295.1–694.3 ppm), and HFSEs(e.g., Zr = 289–520 ppm, Hf = 9.3–15.0 ppm, Y = 36.2–68.2 ppm) but depletions in Ba, Sr, Eu and Ti. The granite is metaluminous to weakly peraluminous and show a clear A-type granite geochemical signature with high SiO_2(70.89 wt%–75.76 wt%), total alkalis(Na_2O + K_2O = 7.51 wt%–8.72 wt%), Ga/Al ratios(10000 Ga/Al = 2.72–3.43). Insitu zircon Hf isotope analysis shows their eHf(t) values ranging from-7.2 to-3.2, with Mesoproterozoic T2DM ages(1308–1525 Ma). Whole-rock Nd isotope data show their eNd(t) values in the range of-9.5 to-9.1 and yield paleoproterozoic TDMages(1606–1985 Ma). These characteristics indicate that the JLY A-type granite magma was formed by the partial melting of Meso-Paleoproterozoic crust rocks in the Cathaysia Block. Our study of the JLY A-type granite, together with other Triassic A-type granitesin South China, defines an extensional environment in the late Triassic which probably was caused by the collision of the South China Block with Indochina Block.
文摘Fear of crime varies considerably depending on its attitude towards environmental conditions. Sense of community and CPTED （crime prevention through environmental design） are believed to have an influence on fear of crime. This paper investigates the hypotheses of influences of CPTED on FOC （fear of crime） and SOC （sense of community）. A total of 171 respondents from the designated residential areas were involved in this study. The structural equation modeling technique was employed and the results indicate that CPTED has a direct influence on fear of crime and sense of community. However, no significant relationship was found between SOC and FOC.
基金This work was partially supported DOE STFR program and CEI grant 68195. C. W. thanks ＂Dissertation Fellowship Award＂ supported by the State University of New York at Binghamton C. S. is partially supported by the Provost＇s Summer Doctoral Fellowship and J. Z. acknowledges grants （the National Natural Science Foundation of China （Nos. 21471160 and 14CX05037A）） and TaiShan Scholar Foundation.
文摘The assembly of nanocrystals into ordered structures called supercrystals or superstructures has become a pivotal frontier owing to numerous useful applications such as correlating the arrangements of atoms in macroscopic crystals and tuning the collective properties to meet the demands of various applications. In this article, recent progress in the preparation of three-dimensional superlattices of nanocrystals is outlined, with a particular emphasis on the driving forces and evolutionary routes beyond orderly assembly. First, the leading or repulsive forces that internally and externally govern the formation of three-dimensional supercrystals are systematically identified and discussed with respect to their origins and functions in three-dimensional self-organization. Then a synoptic introduction of commonly applied means of nanocrystal self-assembly based on growth scenarios such as droplet evaporation and a liquid/liquid interface is presented with specific cases and detailed analyses. Finally, the existing challenges and prospects for this field are briefly highlighted.
基金supported by the National Natural Science Foundation of China(Grant No.41474071)the Special Research of Earthquake Industry(Grant No.2015419015)the Earthquake Technology Project of Spark Plan(Grant No.XH1015)
文摘The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instruments along the profile. Based on seismic facies analysis and travel-time picking on shot record sections, a model of the velocity structure of upper crust was developed by finite-difference tomography of the first breaks; the 2-D P-wave velocity structure and tectonic characteristics of the crust were interpreted further by fitting of waveforms and seismic travel times. The results show that the top of the crystal- line basement is buried at depths of 2.0-4.0 kin, with the deepest buried up to 4.0 km within the Fuzhou Basin. The Moho in- terface was found to be deeper in the west and shallower in the east （i.e., 30.0 km near the coast, increasing to 33.0 km north- westward）. The lower crust on the east side of the Zhenghe-Haifeng Fault Zone has a smoothly varying gradient structure, whereas on the west side it has two distinct layers with a boundary between those layers at a depth of 23 km. Seismic velocities on the west side are generally lower than on the east side; a low velocity layer is observed with a lowest speed of 6.25 km/s at a depth of 22 km on the west side, which may consist of partially molten material. The Zhenghe-Haifeng Fault is a deep crustal fault, and should be a channel for deep material upwelling; it has a direct relationship with multiple stages of continental tectonic movements in Southern China and with multiple magmatic events that started in the Proterozoic and ended in the of late Tertiary in Fujian.
