In accordance with the timely weather report and routine meteorological resources of the meteorological observatory of Liaoning Province from 1979 to 2009,durative fog occurred in Liaoning and their characteristics we...In accordance with the timely weather report and routine meteorological resources of the meteorological observatory of Liaoning Province from 1979 to 2009,durative fog occurred in Liaoning and their characteristics were counted and analyzed in this paper.The report showed that the continuous hazy days occurred three times in 30 years and they had large chances to take place in winter.After the heavy precipitation in the North China and Northeast China,temperature in every place turned up again.If under such circumstances,expansion and temperature inversion happened in the 925 hPa and the wind speed was slower than 4 to 8 m/s in the 1 000 hPa,continuous hazy days happened.展开更多
Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy,...Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy, the pollution caused by small and medium-sized enterprises in towns and villages due to their small investment, low technology level and weak environmental awareness, and the pollution caused by a sharp increase in motor vehicle emissions lead to the fact that fog-haze has been rampant in China’s cities and urban agglomerations for nearly two decades, especially in the Beijing-Tianjin-Hebei region. This paper sorted out the current situation of fog-haze and analyzed the causes of fog-haze from the two aspects of natural and man-made causes, discussed the harms of fog-haze to human body, environment and life, and put forward the concrete measures to solve the fog-haze problem.展开更多
Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. Thi...Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. This, in turn, forced the government to carry out supply-side reforms, to improve energy efficiency and optimize the industrial structure to weaken the environmental pollution. To tackle these problems, this work provides an index system for the issues related to fog-haze, uses a non-linear ST-SVAR model to reflect the effects of industrial structure and energy use efficiency on fog-haze. Results indicated that: First, current industrial structure and energy use efficiency have greater impact on the comprehensive equation of fog-haze risk than itself. With the passage of time, this influence is still gradually expanding. Second, the equations of industrial structure and energy use efficiency are strongly influenced by themselves, and other variables as the current period have less impact on them. Finally, the non-linear or asymmetric relationship is shown among industrial structure, energy use efficiency, and the fog-haze comprehensive risk equation.展开更多
Previous literature shows that scholars differ considerably on what zai and-zhe indicate.By making use of an oral speech corpus,we analyzed and tested the data with regard to the functions of "zai" and "...Previous literature shows that scholars differ considerably on what zai and-zhe indicate.By making use of an oral speech corpus,we analyzed and tested the data with regard to the functions of "zai" and "-zhe" and found that zai indicates the action is in progress,and it is narrative,while-zhe expresses the ongoing state of an action and is descriptive;-zhe can be used after the first verb in a serial verbal con struction to indicate the accompanying action,while zai does not have this function;in complex sentences,the zai clause is temporal in na ture while-zhe clause is treated as a manner adverbial.展开更多
A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadec...A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadecanyl 1 O β D arabinopyranosyloxy (1→4) [ β D arabinopyranosyloxy(1→4)] β D arabinopyranoside. Cervicoside(1) exhibited cytotoxicity against human SKMG 4, Hep G2 and CNE2 cell in vitro.展开更多
By means of Tersoff and Morse potentials, a three-dimensional molecular dynamics simulation is performed to study atomic force microscopy cutting on silicon monocrystal surface. The interatomic forces between the work...By means of Tersoff and Morse potentials, a three-dimensional molecular dynamics simulation is performed to study atomic force microscopy cutting on silicon monocrystal surface. The interatomic forces between the workpiece and the pin tool and the atoms of workpiece themselves are calculated. A screw dislocation is introduced into workpiece Si. It is found that motion of dislocations does not occur during the atomic force microscopy cutting processing. Simulation results show that the shear stress acting on dislocation is far below the yield strength of Si.展开更多
In the study of double pulse ablation of materials （silicon and copper）, a dropdown of double pulse to single pulse fluorescence signal enhancement at low fluences is observed. The dropdown is analysed with a simple...In the study of double pulse ablation of materials （silicon and copper）, a dropdown of double pulse to single pulse fluorescence signal enhancement at low fluences is observed. The dropdown is analysed with a simple theoretical one-dimensional heat diffusion model and verified by fluorescence time constants change as a function of fluence. The dropdown is explained as a result of liquid-solid mixture layer at the liquid and solid boundary. The effect of the layer becomes important at low fluences.展开更多
目的探讨头孢曲松钠联合苄星青霉素对不同孕周的妊娠期梅毒孕妇免疫功能及母婴结局的影响。方法选取2016年6月至2019年6月衡水市第三人民医院妇产科收治的妊娠期梅毒病人152例,均给予头孢曲松钠联合苄星青霉素治疗,按首次治疗时所在孕...目的探讨头孢曲松钠联合苄星青霉素对不同孕周的妊娠期梅毒孕妇免疫功能及母婴结局的影响。方法选取2016年6月至2019年6月衡水市第三人民医院妇产科收治的妊娠期梅毒病人152例,均给予头孢曲松钠联合苄星青霉素治疗,按首次治疗时所在孕周分为A组(n=52,孕周<13周)、B组(n=61,孕周13~27周)、C组(n=39,孕周>27周),比较三组免疫功能、母婴结局、氧化应激、母婴甲苯胺红不加热血清试验(TRUST)阴性率、滴度情况。结果治疗后三组CD3+(62.85±3.89、57.72±4.03、57.13±4.11)、CD4+/CD8+(1.97±0.44、1.58±0.41、1.46±0.38)均高于治疗前(51.07±4.54、51.35±4.06、50.73±4.45、1.19±0.38、1.14±0.36、1.12±0.34)(P<0.05),CD8+(22.32±6.68、26.68±6.05、28.23±5.74)均低于治疗前(33.01±5.15、32.76±5.34、33.12±4.95)(P<0.05),且治疗后A组CD3+、CD4+/CD8+均高于B组、C组(P<0.05),CD8+均低于B组、C组(P<0.05)。A组孕妇分娩孕周均晚于B组、C组(P<0.05),足月分娩率高于B组、C组(P<0.05),不良结局总发生率低于B组、C组(P<0.05),新生儿1 min阿氏(Apgar)评分均大于B组、C组(P<0.05),5 min Apgar评分均大于B组、C组(P<0.05),新生儿窒息发生率与NCS发生率均低于B组、C组(P<0.05)。治疗后三组晚期氧化蛋白产物(AOPP)、丙二醛均低于治疗前(P<0.05),超氧化物歧化酶(SOD)均高于治疗前(P<0.05),且治疗后A组AOPP、丙二醛均低于B组、C组(P<0.05),SOD均高于B组、C组(P<0.05)。A组新生儿TRUST阴性率高于B组、C组(均P<0.017)。结论对妊娠期梅毒病人来说,孕早期(孕周<13周)给予头孢曲松钠联合苄星青霉素治疗更利于增强病人免疫功能,改善母婴结局,减轻病人氧化应激水平,提高新生儿TRUST阴性率。展开更多
The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of sp...The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.展开更多
文摘In accordance with the timely weather report and routine meteorological resources of the meteorological observatory of Liaoning Province from 1979 to 2009,durative fog occurred in Liaoning and their characteristics were counted and analyzed in this paper.The report showed that the continuous hazy days occurred three times in 30 years and they had large chances to take place in winter.After the heavy precipitation in the North China and Northeast China,temperature in every place turned up again.If under such circumstances,expansion and temperature inversion happened in the 925 hPa and the wind speed was slower than 4 to 8 m/s in the 1 000 hPa,continuous hazy days happened.
文摘Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy, the pollution caused by small and medium-sized enterprises in towns and villages due to their small investment, low technology level and weak environmental awareness, and the pollution caused by a sharp increase in motor vehicle emissions lead to the fact that fog-haze has been rampant in China’s cities and urban agglomerations for nearly two decades, especially in the Beijing-Tianjin-Hebei region. This paper sorted out the current situation of fog-haze and analyzed the causes of fog-haze from the two aspects of natural and man-made causes, discussed the harms of fog-haze to human body, environment and life, and put forward the concrete measures to solve the fog-haze problem.
文摘Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. This, in turn, forced the government to carry out supply-side reforms, to improve energy efficiency and optimize the industrial structure to weaken the environmental pollution. To tackle these problems, this work provides an index system for the issues related to fog-haze, uses a non-linear ST-SVAR model to reflect the effects of industrial structure and energy use efficiency on fog-haze. Results indicated that: First, current industrial structure and energy use efficiency have greater impact on the comprehensive equation of fog-haze risk than itself. With the passage of time, this influence is still gradually expanding. Second, the equations of industrial structure and energy use efficiency are strongly influenced by themselves, and other variables as the current period have less impact on them. Finally, the non-linear or asymmetric relationship is shown among industrial structure, energy use efficiency, and the fog-haze comprehensive risk equation.
文摘Previous literature shows that scholars differ considerably on what zai and-zhe indicate.By making use of an oral speech corpus,we analyzed and tested the data with regard to the functions of "zai" and "-zhe" and found that zai indicates the action is in progress,and it is narrative,while-zhe expresses the ongoing state of an action and is descriptive;-zhe can be used after the first verb in a serial verbal con struction to indicate the accompanying action,while zai does not have this function;in complex sentences,the zai clause is temporal in na ture while-zhe clause is treated as a manner adverbial.
文摘A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadecanyl 1 O β D arabinopyranosyloxy (1→4) [ β D arabinopyranosyloxy(1→4)] β D arabinopyranoside. Cervicoside(1) exhibited cytotoxicity against human SKMG 4, Hep G2 and CNE2 cell in vitro.
基金Supported by the National Natural Science Foundation of China under Grant No 10372107 and 10721202, and the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-YW-M04.
文摘By means of Tersoff and Morse potentials, a three-dimensional molecular dynamics simulation is performed to study atomic force microscopy cutting on silicon monocrystal surface. The interatomic forces between the workpiece and the pin tool and the atoms of workpiece themselves are calculated. A screw dislocation is introduced into workpiece Si. It is found that motion of dislocations does not occur during the atomic force microscopy cutting processing. Simulation results show that the shear stress acting on dislocation is far below the yield strength of Si.
基金Supported by the National Natural Science Foundation of China under Grant No 10404008, the National Science Foundation from United States under Grants Nos PHY-0200812, CHE-0120997 and CHE-0640306, and the Motorola Physical Realization Research Center in Schaumburg, IL.
文摘In the study of double pulse ablation of materials （silicon and copper）, a dropdown of double pulse to single pulse fluorescence signal enhancement at low fluences is observed. The dropdown is analysed with a simple theoretical one-dimensional heat diffusion model and verified by fluorescence time constants change as a function of fluence. The dropdown is explained as a result of liquid-solid mixture layer at the liquid and solid boundary. The effect of the layer becomes important at low fluences.
文摘目的探讨头孢曲松钠联合苄星青霉素对不同孕周的妊娠期梅毒孕妇免疫功能及母婴结局的影响。方法选取2016年6月至2019年6月衡水市第三人民医院妇产科收治的妊娠期梅毒病人152例,均给予头孢曲松钠联合苄星青霉素治疗,按首次治疗时所在孕周分为A组(n=52,孕周<13周)、B组(n=61,孕周13~27周)、C组(n=39,孕周>27周),比较三组免疫功能、母婴结局、氧化应激、母婴甲苯胺红不加热血清试验(TRUST)阴性率、滴度情况。结果治疗后三组CD3+(62.85±3.89、57.72±4.03、57.13±4.11)、CD4+/CD8+(1.97±0.44、1.58±0.41、1.46±0.38)均高于治疗前(51.07±4.54、51.35±4.06、50.73±4.45、1.19±0.38、1.14±0.36、1.12±0.34)(P<0.05),CD8+(22.32±6.68、26.68±6.05、28.23±5.74)均低于治疗前(33.01±5.15、32.76±5.34、33.12±4.95)(P<0.05),且治疗后A组CD3+、CD4+/CD8+均高于B组、C组(P<0.05),CD8+均低于B组、C组(P<0.05)。A组孕妇分娩孕周均晚于B组、C组(P<0.05),足月分娩率高于B组、C组(P<0.05),不良结局总发生率低于B组、C组(P<0.05),新生儿1 min阿氏(Apgar)评分均大于B组、C组(P<0.05),5 min Apgar评分均大于B组、C组(P<0.05),新生儿窒息发生率与NCS发生率均低于B组、C组(P<0.05)。治疗后三组晚期氧化蛋白产物(AOPP)、丙二醛均低于治疗前(P<0.05),超氧化物歧化酶(SOD)均高于治疗前(P<0.05),且治疗后A组AOPP、丙二醛均低于B组、C组(P<0.05),SOD均高于B组、C组(P<0.05)。A组新生儿TRUST阴性率高于B组、C组(均P<0.017)。结论对妊娠期梅毒病人来说,孕早期(孕周<13周)给予头孢曲松钠联合苄星青霉素治疗更利于增强病人免疫功能,改善母婴结局,减轻病人氧化应激水平,提高新生儿TRUST阴性率。
基金supported by the National Natural Science Foundation of China (12171291,11601291,61873154)the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (20200001)+5 种基金the Fundamental Research Program of Shanxi Province (20210302124018)the Shanxi Scholarship Council of China (HGKY2019004)the Scientific and Technological Innovation Programs (STIP)of Higher Education Institutions in Shanxi (2019L0082)the Program for the Outstanding Innovative Teams (OIT)of Higher Learning Institutions of Shanxithe Simons Foundation-Mathematics and Physical Sciences (523360)the 1331 Engineering Project of Shanxi Province.
文摘The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.
