Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing...Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing performance has rarely been stu-died.In this work,we reported a high-performance sensor based on the cross-stacked aligned CNF membrane.The effects of crossstacked structures on the sensing characteristics were systemati-cally investigated.The flexible strain sensor could capture low detection limit(<0.1%)with a gauge factor(GF)of 4.24 and wide strain range up to 130%.The uniform GF value reached 2050 when the strain was in the range of 100-130%.In addition,the high linearity under 40%strain(>0.998),excellent durability and quick response time(<200 ms)were demonstrated.The excellent com-prehensive performances were simultaneously obtained.The sen-sor could be used in extensive applications,such as monitoring body movements and distinguishing the track of writing.展开更多
CONSPECTUS:Nanozymes are nanomaterials with intrinsic enzyme-like properties that can overcome the current limitations of natural enzymes,such as high preparation cost,instability,restricted application scenarios,etc....CONSPECTUS:Nanozymes are nanomaterials with intrinsic enzyme-like properties that can overcome the current limitations of natural enzymes,such as high preparation cost,instability,restricted application scenarios,etc.Since the Fe3O4 nanoparticles(NPs)were shown to possess the peroxidase(POD)-like activity in 2007,thousands of nanomaterials were reported to mimic the catalytic properties of various types of enzymes including catalase(CAT),haloperoxidase,superoxide dismutase(SOD),glucose oxidase,glutathione peroxidase,hydrolase,nuclease,nitroreductase,and others.展开更多
At present, the Topographic Index Model （TOPMODEL） has been recommended for integration in Land Surface Models （LSMs）. But, the applicable scope of the original TOPMODEL （OTOP） is limited because the OTOP deriva...At present, the Topographic Index Model （TOPMODEL） has been recommended for integration in Land Surface Models （LSMs）. But, the applicable scope of the original TOPMODEL （OTOP） is limited because the OTOP derivation relies on three fundamental but unrealistic assumptions. In this paper, several versions of a generalized TOPMODEL （GTOP）, which relax some unrealistic assumptions involved in OTOP, are presented, and the theoretical derivationsn to obtain these modifications are demonstrated in detail. Specifically, the extension for the OTOP applicability comes down to following three basic cases： （1） Give up the assumption of spatially uniform recharge rate to the groundwater and let the rate be spatially varying, （2） Keep same original exponential distribution profile of hydraulic conductivity used in OTOP but change the saturated hydraulic conductivity and effective soil depth from spatial constants in OTOP to spatially variable quantities; and （3） Extend the original exponential distribution profile of hydraulic conductivity to more general power law distribution profile of hydraulic conductivity together with spatially variable saturated hydraulic conductivity and effective soil depth. Finally, a brief numerical sensitivity study based on one version of GTOP using an exponential distribution profile for soil hydraulic conductivity is conducted. This shows the heterogeneous effects of the effective soil depth, saturated hydraulic conductivity, at ground surface and groundwater recharge rate on hydrological processes and serves as an example application of GTOP to a heterogeneous catchment.展开更多
In this paper,we present the simplification of Sachs formulas for the measurement and calculation of the residual stresses of the cylinder only with the plane stresses. Furthermore, we present the method for the measu...In this paper,we present the simplification of Sachs formulas for the measurement and calculation of the residual stresses of the cylinder only with the plane stresses. Furthermore, we present the method for the measurement and calculation of the residual stresses of the cylinder not only with the finite length but with the longitudinal stress. These can be applied to the investigation on the residual stresses of the autofretted gun tube.展开更多
At present, with the further acceleration of the process of social urbanization, the frequency and total amount of various kinds of production materials have been accelerated. However, due to the limitations of many p...At present, with the further acceleration of the process of social urbanization, the frequency and total amount of various kinds of production materials have been accelerated. However, due to the limitations of many production factors such as technology, energy and measures, the contradiction of environmental problems including air pollution is becoming increasingly acute. How to reduce and reduce the impact of pollution on the environment and strengthen the control of environmental monitoring is particularly important. This paper takes the research on the role of environmental monitoring in air pollution control as the argument, and discusses it with the way of truth and examples, and draws the conclusion that measures should be taken to define the requirements of air monitoring as the starting point, determine the monitoring management objectives, improve and optimize the monitoring operation system, and realize the innovation of monitoring technology, so as to lay a solid foundation for improving the effectiveness of air pollution control.展开更多
基金This work was supported by the Jiangsu Planned Projects for Postdoctoral Research Funds[2020Z251]Primary Research&Developement Plan of Jiangsu Province[BE2019045]+1 种基金Science and Technology Guidance Project of China National Textile and Apparel Council[2020102]Third-Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing performance has rarely been stu-died.In this work,we reported a high-performance sensor based on the cross-stacked aligned CNF membrane.The effects of crossstacked structures on the sensing characteristics were systemati-cally investigated.The flexible strain sensor could capture low detection limit(<0.1%)with a gauge factor(GF)of 4.24 and wide strain range up to 130%.The uniform GF value reached 2050 when the strain was in the range of 100-130%.In addition,the high linearity under 40%strain(>0.998),excellent durability and quick response time(<200 ms)were demonstrated.The excellent com-prehensive performances were simultaneously obtained.The sen-sor could be used in extensive applications,such as monitoring body movements and distinguishing the track of writing.
基金supported by the National Key R&D Program of China(No.2022YFA1205801)the National Natural Science Foundation of China(Nos.T2225026,82172087,52202344,82071308)the Beijing Institute of Technology Research Fund Program for Young Scholars.
文摘CONSPECTUS:Nanozymes are nanomaterials with intrinsic enzyme-like properties that can overcome the current limitations of natural enzymes,such as high preparation cost,instability,restricted application scenarios,etc.Since the Fe3O4 nanoparticles(NPs)were shown to possess the peroxidase(POD)-like activity in 2007,thousands of nanomaterials were reported to mimic the catalytic properties of various types of enzymes including catalase(CAT),haloperoxidase,superoxide dismutase(SOD),glucose oxidase,glutathione peroxidase,hydrolase,nuclease,nitroreductase,and others.
基金supported by National Natural Science Foundation of China (Grant Nos.40235043 and 40605024)the Natural Science Foundation of Shandong Province (Grant No. Q2005E01)
文摘At present, the Topographic Index Model （TOPMODEL） has been recommended for integration in Land Surface Models （LSMs）. But, the applicable scope of the original TOPMODEL （OTOP） is limited because the OTOP derivation relies on three fundamental but unrealistic assumptions. In this paper, several versions of a generalized TOPMODEL （GTOP）, which relax some unrealistic assumptions involved in OTOP, are presented, and the theoretical derivationsn to obtain these modifications are demonstrated in detail. Specifically, the extension for the OTOP applicability comes down to following three basic cases： （1） Give up the assumption of spatially uniform recharge rate to the groundwater and let the rate be spatially varying, （2） Keep same original exponential distribution profile of hydraulic conductivity used in OTOP but change the saturated hydraulic conductivity and effective soil depth from spatial constants in OTOP to spatially variable quantities; and （3） Extend the original exponential distribution profile of hydraulic conductivity to more general power law distribution profile of hydraulic conductivity together with spatially variable saturated hydraulic conductivity and effective soil depth. Finally, a brief numerical sensitivity study based on one version of GTOP using an exponential distribution profile for soil hydraulic conductivity is conducted. This shows the heterogeneous effects of the effective soil depth, saturated hydraulic conductivity, at ground surface and groundwater recharge rate on hydrological processes and serves as an example application of GTOP to a heterogeneous catchment.
文摘In this paper,we present the simplification of Sachs formulas for the measurement and calculation of the residual stresses of the cylinder only with the plane stresses. Furthermore, we present the method for the measurement and calculation of the residual stresses of the cylinder not only with the finite length but with the longitudinal stress. These can be applied to the investigation on the residual stresses of the autofretted gun tube.
文摘At present, with the further acceleration of the process of social urbanization, the frequency and total amount of various kinds of production materials have been accelerated. However, due to the limitations of many production factors such as technology, energy and measures, the contradiction of environmental problems including air pollution is becoming increasingly acute. How to reduce and reduce the impact of pollution on the environment and strengthen the control of environmental monitoring is particularly important. This paper takes the research on the role of environmental monitoring in air pollution control as the argument, and discusses it with the way of truth and examples, and draws the conclusion that measures should be taken to define the requirements of air monitoring as the starting point, determine the monitoring management objectives, improve and optimize the monitoring operation system, and realize the innovation of monitoring technology, so as to lay a solid foundation for improving the effectiveness of air pollution control.
