With the objective of establishing a distinction between deformation structures caused by freeze/thaw cycles and those resulting from seismic activity, we studied three well–exposed alluvial deposits in a section at ...With the objective of establishing a distinction between deformation structures caused by freeze/thaw cycles and those resulting from seismic activity, we studied three well–exposed alluvial deposits in a section at Dogai Coring, northern Qiangtang Basin, Tibetan Plateau. Deformation is present in the form of plastic structures(diapirs, folds and clastic dykes), brittle structures(micro–faults) and cryogenic wedges. These soft–sediment deformation features(except the micro–faults) are mainly characterized by meter–scale, non–interlayered, low–speed and low–pressure displacements within soft sediments, most commonly in the form of plastic deformation. Taking into account the geographic setting, lithology and deformation features, we interpret these soft–sediment deformation features as the products of freeze/thaw cycles, rather than of earthquake–induced shock waves, thus reflecting regional temperature changes and fluctuations of hydrothermal conditions in the uppermost sediments. The micro–faults(close to linear hot springs) are ascribed to regional fault activity;however, we were unable to identify the nature of the micro–faults, perhaps due to disturbance by subsequent freeze/thaw cycles. This study may serve as a guide to recognizing the differences between deformation structures attributed to freeze/thaw cycles and seismic processes.展开更多
With the rapid development of nanotechnology and widespread use of nanoproducts, concerns have arisen regarding the ecotoxicity of these materials. In this paper, the photosynthetic toxicity and oxidative damage induc...With the rapid development of nanotechnology and widespread use of nanoproducts, concerns have arisen regarding the ecotoxicity of these materials. In this paper, the photosynthetic toxicity and oxidative damage induced by nano Fe3O4 on a model organism, Chlorella vulgaris (C. vulgaris) in aquatic environment, were studied. The results showed that Nano-Fe3O4 was toxic to C. vulgaris and affected its content of chlorophyll a, malonaldehyde and glutathione, CO2 absorption, net photosynthetic rate, superoxide dismutase activity and inhibition of hydroxyl radical generation. At higher concentrations, compared with the control group, the toxicity of nano-Fe3O4 was significantly different. It suggested that nano-Fe3O4 is ecotoxic to C. vulgaris in aquatic environment.展开更多
Scholars have long been interested in rebellions and revolution in Chinese history The interest has a real-world basis： China＇s long and turbulent past is a rich minefor academic study, and the country＇s seemingly ...Scholars have long been interested in rebellions and revolution in Chinese history The interest has a real-world basis： China＇s long and turbulent past is a rich minefor academic study, and the country＇s seemingly endless conflicts and struggles in recent centuries give such study relevance to reality. For obvious reasons, most studies of Chinese rebellions and revolutions focus on rural society. Wu Jen-shu＇s Jibian liangmin is among relatively few works that devote attention to public, and often violent, expressions of displeasure in Chinese cities and towns before modern times.展开更多
This article analyzes Nanxun, a lower Yangzi delta town known for its silk products, as a case study of China＇s development and underdevelopment. In the late nineteenth and early twentieth centuries, a booming silk t...This article analyzes Nanxun, a lower Yangzi delta town known for its silk products, as a case study of China＇s development and underdevelopment. In the late nineteenth and early twentieth centuries, a booming silk trade linked Nanxun to the global market and made it an extraordinarily wealthy town, yet little was achieved in terms of urban development. Scholars have attributed the underdevelopment of Nanxun to economic factors, and perceived it as entirely undesirable. This article argues that a largely overlooked cause of Nanxun＇s underdevelopment was the conformist culture of Nanxun＇s ruling elite. The merchants who created the wealth of the town by their very natures preferred to create a safe and secluded zone in which the familiarity of their living environment could be preserved and the comfort of a traditional lifestyle assured. The underdevelopment of Nanxun turned out, however, not to be completely negative. The town did not sustain its status as a trading center, nor develop into a major city, but its arrested development preserved much of its original layout and, moreover, its culture. From a cultural and environmental point of view, Nanxun＇s underdevelopment may have proved to be more valuable than if the town had become an indistinguishable industrial site.展开更多
基金supported by projects from the National Natural Science Foundation of China (41807298, 41702372, 41672211)the China Postdoctoral Science Foundation (2019M650788)+2 种基金National Key Research and Development Project of China (2016YFC0600310)the China Geological Survey (DD20160022, DD20190059)the Basic Research Funds (JYYWF201810) of the Institute of Geology, CAGS.
文摘With the objective of establishing a distinction between deformation structures caused by freeze/thaw cycles and those resulting from seismic activity, we studied three well–exposed alluvial deposits in a section at Dogai Coring, northern Qiangtang Basin, Tibetan Plateau. Deformation is present in the form of plastic structures(diapirs, folds and clastic dykes), brittle structures(micro–faults) and cryogenic wedges. These soft–sediment deformation features(except the micro–faults) are mainly characterized by meter–scale, non–interlayered, low–speed and low–pressure displacements within soft sediments, most commonly in the form of plastic deformation. Taking into account the geographic setting, lithology and deformation features, we interpret these soft–sediment deformation features as the products of freeze/thaw cycles, rather than of earthquake–induced shock waves, thus reflecting regional temperature changes and fluctuations of hydrothermal conditions in the uppermost sediments. The micro–faults(close to linear hot springs) are ascribed to regional fault activity;however, we were unable to identify the nature of the micro–faults, perhaps due to disturbance by subsequent freeze/thaw cycles. This study may serve as a guide to recognizing the differences between deformation structures attributed to freeze/thaw cycles and seismic processes.
文摘With the rapid development of nanotechnology and widespread use of nanoproducts, concerns have arisen regarding the ecotoxicity of these materials. In this paper, the photosynthetic toxicity and oxidative damage induced by nano Fe3O4 on a model organism, Chlorella vulgaris (C. vulgaris) in aquatic environment, were studied. The results showed that Nano-Fe3O4 was toxic to C. vulgaris and affected its content of chlorophyll a, malonaldehyde and glutathione, CO2 absorption, net photosynthetic rate, superoxide dismutase activity and inhibition of hydroxyl radical generation. At higher concentrations, compared with the control group, the toxicity of nano-Fe3O4 was significantly different. It suggested that nano-Fe3O4 is ecotoxic to C. vulgaris in aquatic environment.
文摘Scholars have long been interested in rebellions and revolution in Chinese history The interest has a real-world basis： China＇s long and turbulent past is a rich minefor academic study, and the country＇s seemingly endless conflicts and struggles in recent centuries give such study relevance to reality. For obvious reasons, most studies of Chinese rebellions and revolutions focus on rural society. Wu Jen-shu＇s Jibian liangmin is among relatively few works that devote attention to public, and often violent, expressions of displeasure in Chinese cities and towns before modern times.
文摘This article analyzes Nanxun, a lower Yangzi delta town known for its silk products, as a case study of China＇s development and underdevelopment. In the late nineteenth and early twentieth centuries, a booming silk trade linked Nanxun to the global market and made it an extraordinarily wealthy town, yet little was achieved in terms of urban development. Scholars have attributed the underdevelopment of Nanxun to economic factors, and perceived it as entirely undesirable. This article argues that a largely overlooked cause of Nanxun＇s underdevelopment was the conformist culture of Nanxun＇s ruling elite. The merchants who created the wealth of the town by their very natures preferred to create a safe and secluded zone in which the familiarity of their living environment could be preserved and the comfort of a traditional lifestyle assured. The underdevelopment of Nanxun turned out, however, not to be completely negative. The town did not sustain its status as a trading center, nor develop into a major city, but its arrested development preserved much of its original layout and, moreover, its culture. From a cultural and environmental point of view, Nanxun＇s underdevelopment may have proved to be more valuable than if the town had become an indistinguishable industrial site.
