AIM： To investigate the expression and distribution of HBV in the ovaries and ova. METHODS： The immunohistochemistry method was used to detect the HBsAg and HBcAg in the ovaries of patients with chronic hepatitis B....AIM： To investigate the expression and distribution of HBV in the ovaries and ova. METHODS： The immunohistochemistry method was used to detect the HBsAg and HBcAg in the ovaries of patients with chronic hepatitis B. RESULTS： Expression of HBsAg in the ova, granular and interstitial cells of the ovaries was located in the cytomembrane and cytoplasm. Expression of HBcAg in the ova, granular, interstitial and endothelial cells of interstitial blood vessels of the ovaries was found in the cytomembrane, cytoplasm, and nuclei. CONCLUSION： HBV can infect the ova at different stages of development and replicate in it. 2005 The W3G Press and Elsevier Inc. All rights reserved.展开更多
Multiple UAVs are usually deployed to provide robustness through redundancy and to accomplish surveillance,search,attack and rescue missions.Formation reconfiguration was inevitable during the flight when the mission ...Multiple UAVs are usually deployed to provide robustness through redundancy and to accomplish surveillance,search,attack and rescue missions.Formation reconfiguration was inevitable during the flight when the mission was adjusted or the environment varied.Taking the typical formation reconfiguration from a triangular penetrating formation to a circular tracking formation for example,a path planning method based on Dubins trajectory and particle swarm optimization(PSO)algorithm is presented in this paper.The mathematic model of multiple UAVs formation reconfiguration was built firstly.According to the kinematic model of aerial vehicles,a process of dimensionality reduction was carried out to simplify the model based on Dubins trajectory.The PSO algorithm was adopted to resolve the optimization problem of formation reconfiguration path planning.Finally,the simulation and vehicles flight experiment are executed.Results show that the path planning method based on the Dubins trajectory and the PSO algorithm can generate feasible paths for vehicles on time,to guarantee the rapidity and effectiveness of formation reconfigurations.Furthermore,from the simulation results,the method is universal and could be extended easily to the path planning problem for different kinds of formation reconfigurations.展开更多
探究施钙对不同花生荚果发育时期光合碳在植株-土壤系统分配的影响,有利于改善钙肥管理,提升花生产量和土壤有机碳含量。本研究选用普通大花生品种‘花育22’,设置CaO 0、75、150和300 kg hm^(-2)4个施钙梯度,分别记为T0、T1、T2、T3,...探究施钙对不同花生荚果发育时期光合碳在植株-土壤系统分配的影响,有利于改善钙肥管理,提升花生产量和土壤有机碳含量。本研究选用普通大花生品种‘花育22’,设置CaO 0、75、150和300 kg hm^(-2)4个施钙梯度,分别记为T0、T1、T2、T3,于盆栽条件下研究施钙量对花生产量和不同荚果发育时期光合碳在花生植株-土壤系统中分配的影响。结果表明,不同施钙量对花生植株总干物质积累无明显影响。适宜施钙量可显著降低花生千克果数和千克仁数,提升花生出仁率、饱果率和荚果产量,在2018年和2019年,T2处理荚果产量较T0可分别提升17.5%和25.1%。基于施钙量与花生荚果和籽仁产量的拟合分析发现,当钙肥施用量为165 kg hm^(-2)和173 kg hm^(-2)时,可分别获得最高的花生荚果和籽仁产量。适宜施钙量可明显提升鸡咀幼果期和荚果膨大期花生植株光合^(13)C的积累量,提升各荚果发育时期^(13)C在花生籽仁中的分配比例,其中,在荚果定型期和籽仁充实期,T2和T3处理下^(13)C在花生籽仁中的分配比例分别可达33.4%~37.2%和38.7%~40.0%。适宜施钙量还可提高花生植株光合^(13)C在土壤中的分配比例,最高可达52.6%(T2),但随着花生荚果发育进程的推进,此分配比例逐渐降低。综上,适宜施钙量可调控不同花生荚果发育时期光合^(13)C在植株-土壤系统的分配,显著提升花生产量和光合^(13)C在花生籽仁和土壤中的分配比例;本研究条件下,推荐适宜施钙量(CaO)为173 kg hm^(-2)。展开更多
Accelerated environmental(hygrothermal)exposure experiments are performed on organic paints coated on commercial die-cast AZ91D Mg alloys to investigate the effects of contamination on blistering.Specifically,artifici...Accelerated environmental(hygrothermal)exposure experiments are performed on organic paints coated on commercial die-cast AZ91D Mg alloys to investigate the effects of contamination on blistering.Specifically,artificial human perspiration spray is used to contaminate the substrate surface.Blistering occurred only for paints that are spread on surfaces with the perspiration present.More blisters gradually form at longer test times,and the volume of blistering increases.Scanning electron microscopy indicates that blistering is initiated by contamination and/or substrate corrosion at the interface of the organic paints and the substrate.Blistering is characterized for two samples exposed to the hygrothermal environments for various times,and is found to be initially empty in the early stages.Hydrophilic chloride contaminants from the perspiration lead to in situ adhesion loss.Simultaneously,the paints volume expands,and the associated compressive stress causes it to bulge.After long-term test exposure,chloride anions corrode the substrate under the films,and MgO,Mg(OH)_(2),and Mg_(2)(OH)_(3)Cl corrosion products fill the blisters.Finally,a model of blistering evolution is discussed.展开更多
利用十溴二苯乙烷(DBDPE)与三氧化二锑(Sb 2 O 3)组成的卤锑阻燃剂对交联聚乙烯进行阻燃改性,研究了阻燃剂含量对交联聚乙烯材料阻燃性能的影响,材料含22.5%DBDPE和7.5%Sb 2 O 3在UL94阻燃测试达到V-0等级。通过体系树脂熔体流动性的优...利用十溴二苯乙烷(DBDPE)与三氧化二锑(Sb 2 O 3)组成的卤锑阻燃剂对交联聚乙烯进行阻燃改性,研究了阻燃剂含量对交联聚乙烯材料阻燃性能的影响,材料含22.5%DBDPE和7.5%Sb 2 O 3在UL94阻燃测试达到V-0等级。通过体系树脂熔体流动性的优化,可改善高填充量阻燃剂时材料的滚塑加工性能。实验室制备了滚塑用V-0级阻燃交联聚乙烯,并测试了材料的机械性能包括拉伸强度、弯曲模量和缺口冲击强度等。所制材料缺口冲击强度达到43 kJ/m^2。SEM和EDS表征显示阻燃剂在体系内分散较均匀。展开更多
基金supported by the National Natural Science Foundation of China(81991491,82273640,and 82072323)CAMS Innovation Fund for Medical Sciences of China(2019RU022)+1 种基金Fundamental Research Funds for the Central Universities(20720220006 and 20720200105)Xiamen Innovax(provided qualified test and control vaccine)。
基金Supported by the National Natural Science Foundation of China, No. 30371277
文摘AIM： To investigate the expression and distribution of HBV in the ovaries and ova. METHODS： The immunohistochemistry method was used to detect the HBsAg and HBcAg in the ovaries of patients with chronic hepatitis B. RESULTS： Expression of HBsAg in the ova, granular and interstitial cells of the ovaries was located in the cytomembrane and cytoplasm. Expression of HBcAg in the ova, granular, interstitial and endothelial cells of interstitial blood vessels of the ovaries was found in the cytomembrane, cytoplasm, and nuclei. CONCLUSION： HBV can infect the ova at different stages of development and replicate in it. 2005 The W3G Press and Elsevier Inc. All rights reserved.
基金Project (61703414) supported by the National Natural Science Foundation of ChinaProject (3101047) supported by the Defense Science and Technology Foundation of China+1 种基金Project (2017JJ3366) supported by the Natural Science Foundation of Hunan ChinaProject (2015M582881) supported by the China Postdoctoral Science Foundation
文摘Multiple UAVs are usually deployed to provide robustness through redundancy and to accomplish surveillance,search,attack and rescue missions.Formation reconfiguration was inevitable during the flight when the mission was adjusted or the environment varied.Taking the typical formation reconfiguration from a triangular penetrating formation to a circular tracking formation for example,a path planning method based on Dubins trajectory and particle swarm optimization(PSO)algorithm is presented in this paper.The mathematic model of multiple UAVs formation reconfiguration was built firstly.According to the kinematic model of aerial vehicles,a process of dimensionality reduction was carried out to simplify the model based on Dubins trajectory.The PSO algorithm was adopted to resolve the optimization problem of formation reconfiguration path planning.Finally,the simulation and vehicles flight experiment are executed.Results show that the path planning method based on the Dubins trajectory and the PSO algorithm can generate feasible paths for vehicles on time,to guarantee the rapidity and effectiveness of formation reconfigurations.Furthermore,from the simulation results,the method is universal and could be extended easily to the path planning problem for different kinds of formation reconfigurations.
文摘探究施钙对不同花生荚果发育时期光合碳在植株-土壤系统分配的影响,有利于改善钙肥管理,提升花生产量和土壤有机碳含量。本研究选用普通大花生品种‘花育22’,设置CaO 0、75、150和300 kg hm^(-2)4个施钙梯度,分别记为T0、T1、T2、T3,于盆栽条件下研究施钙量对花生产量和不同荚果发育时期光合碳在花生植株-土壤系统中分配的影响。结果表明,不同施钙量对花生植株总干物质积累无明显影响。适宜施钙量可显著降低花生千克果数和千克仁数,提升花生出仁率、饱果率和荚果产量,在2018年和2019年,T2处理荚果产量较T0可分别提升17.5%和25.1%。基于施钙量与花生荚果和籽仁产量的拟合分析发现,当钙肥施用量为165 kg hm^(-2)和173 kg hm^(-2)时,可分别获得最高的花生荚果和籽仁产量。适宜施钙量可明显提升鸡咀幼果期和荚果膨大期花生植株光合^(13)C的积累量,提升各荚果发育时期^(13)C在花生籽仁中的分配比例,其中,在荚果定型期和籽仁充实期,T2和T3处理下^(13)C在花生籽仁中的分配比例分别可达33.4%~37.2%和38.7%~40.0%。适宜施钙量还可提高花生植株光合^(13)C在土壤中的分配比例,最高可达52.6%(T2),但随着花生荚果发育进程的推进,此分配比例逐渐降低。综上,适宜施钙量可调控不同花生荚果发育时期光合^(13)C在植株-土壤系统的分配,显著提升花生产量和光合^(13)C在花生籽仁和土壤中的分配比例;本研究条件下,推荐适宜施钙量(CaO)为173 kg hm^(-2)。
基金the National Natural Science Foundation of China(grant no.51374151)the Natural Science Foundation of Shanxi Province(grant No.2015011038)+2 种基金the PhD Scientific Research Startup Foundation(grant no.20152011)Youth Scientific Research Foundation(grant no.20153003)of TYUSTthe China Postdoctoral Science Foundation(grant no.20100471586)for funding provided in support of this work.
文摘Accelerated environmental(hygrothermal)exposure experiments are performed on organic paints coated on commercial die-cast AZ91D Mg alloys to investigate the effects of contamination on blistering.Specifically,artificial human perspiration spray is used to contaminate the substrate surface.Blistering occurred only for paints that are spread on surfaces with the perspiration present.More blisters gradually form at longer test times,and the volume of blistering increases.Scanning electron microscopy indicates that blistering is initiated by contamination and/or substrate corrosion at the interface of the organic paints and the substrate.Blistering is characterized for two samples exposed to the hygrothermal environments for various times,and is found to be initially empty in the early stages.Hydrophilic chloride contaminants from the perspiration lead to in situ adhesion loss.Simultaneously,the paints volume expands,and the associated compressive stress causes it to bulge.After long-term test exposure,chloride anions corrode the substrate under the films,and MgO,Mg(OH)_(2),and Mg_(2)(OH)_(3)Cl corrosion products fill the blisters.Finally,a model of blistering evolution is discussed.
文摘利用十溴二苯乙烷(DBDPE)与三氧化二锑(Sb 2 O 3)组成的卤锑阻燃剂对交联聚乙烯进行阻燃改性,研究了阻燃剂含量对交联聚乙烯材料阻燃性能的影响,材料含22.5%DBDPE和7.5%Sb 2 O 3在UL94阻燃测试达到V-0等级。通过体系树脂熔体流动性的优化,可改善高填充量阻燃剂时材料的滚塑加工性能。实验室制备了滚塑用V-0级阻燃交联聚乙烯,并测试了材料的机械性能包括拉伸强度、弯曲模量和缺口冲击强度等。所制材料缺口冲击强度达到43 kJ/m^2。SEM和EDS表征显示阻燃剂在体系内分散较均匀。
