On December 21, 20：10, a stray dog consecutively attacked 10 people in Lengshui Village, Ningyuan County, Yongzhou City, Hunan Province, China. The dog was killed by the local CDC staff and vicinity villager, its bra...On December 21, 20：10, a stray dog consecutively attacked 10 people in Lengshui Village, Ningyuan County, Yongzhou City, Hunan Province, China. The dog was killed by the local CDC staff and vicinity villager, its brain tissue sample was taken within 24 h. The epidemic focus was disinfected and the injured people received post exposure prophylaxis （PEP）. Pathogens were detected in the tissue sample by the provincial CDC. The immunity and safety of rabies vaccine were assayed after PEP, the injured people were regularly followed up in the following 2 y and 6 mon.展开更多
In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fi...In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fine aggregate, reduce the consumption of the natural resources and improve the durability of concrete. In this study, the effect of the fineness on the high temperature and sulphate resistances of concrete mortar specimens, produced with ground granulated blast-furnace slag (GBFS) replacing cement, is investigated. The compressive and flexural strength test results for all series related to durability effects, exposing temperature and solutions, exposure times for these durability effects, slag content and fineness are discussed. Conse- quently, the optimum slag contents are determined for producing the sulphate and high temperature resistant mortars.展开更多
A numerical model was proposed to describe the modulus variation of mortar exposed to external sulfate attack and the effectivity was verified by experiments. The model joints statistical evolution of microcracks to e...A numerical model was proposed to describe the modulus variation of mortar exposed to external sulfate attack and the effectivity was verified by experiments. The model joints statistical evolution of microcracks to effective elastic modulus with microcracks and is applied to predict the damage degree of mortar attacked by sulfate. The experimental results show that the model can predict the modulus variation development of the specimen and the microcraks density. The elastic modulus values calculated by the model are consistent with that measured by experiments. The model focuses on nucleation of microcracks and finds that the theoretical results of microcracks number density show a linear growth over time in mortar. Compared with other sulfate attack damage model, this model provides a more suitable damage evolution equation that can be used to analyze the chemically assisted damage.展开更多
为实现高效、快速、客观地对对地攻击无人机自主作战效能进行评估,文中引入向量加权平均算法(Weighed Mean of Vectors Algorithm,INFO)和K折交叉验证方法对随机森林算法(Random Forest,RF)进行优化寻找最优参数组合,提出了基于优化随...为实现高效、快速、客观地对对地攻击无人机自主作战效能进行评估,文中引入向量加权平均算法(Weighed Mean of Vectors Algorithm,INFO)和K折交叉验证方法对随机森林算法(Random Forest,RF)进行优化寻找最优参数组合,提出了基于优化随机森林的对地攻击无人机自主作战效能评估方法。首先,基于向量加权平均优化算法理论,对随机森林决策树模型数量以及最大深度两项超参数进行寻优。其次,结合对地攻击无人机作战任务,对自主作战效能评估的主要作战因素进行分析,归纳总结了对地攻击无人机自主作战效能评估指标体系,并建立了基于INFO-RF的无人机自主作战效能评估模型。最后,通过对评估模型进行实例验证并与其他方法进行对比分析,结果表明,相较于传统RF模型、GA-RF模型和SVM模型,INFO-RF模型输出结果具有较高的拟合度和更为精确的评估值,实例结果有效验证了所提方法的合理性和优化模型的可靠性。展开更多
基金supported by the National Department Public Benefit Research Foundation(201103032)
文摘On December 21, 20：10, a stray dog consecutively attacked 10 people in Lengshui Village, Ningyuan County, Yongzhou City, Hunan Province, China. The dog was killed by the local CDC staff and vicinity villager, its brain tissue sample was taken within 24 h. The epidemic focus was disinfected and the injured people received post exposure prophylaxis （PEP）. Pathogens were detected in the tissue sample by the provincial CDC. The immunity and safety of rabies vaccine were assayed after PEP, the injured people were regularly followed up in the following 2 y and 6 mon.
文摘目的探究及观察白葡奈氏菌片联合吸入糖皮质激素+长效β2受体激动剂(inhaled corticosteroid+long-acting β_(2)-agonist,ICS+LABA)治疗中重度慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)急性发作的疗效及对生活质量的影响。方法将2020年6月—2021年12月山东第一医科大学附属省立医院的80例中重度COPD急性发作患者根据随机数字表法分为2组。对照组的40例采用ICS+LABA进行治疗,观察组的40例则在对照组的基础上加用白葡奈氏菌片。比较2组的COPD治疗总有效率、不良反应发生率、治疗前后的症状体征积分、疾病状态[慢性阻塞性肺疾病评分(COPD assessment test,CAT评分)]及生活质量[世界卫生组织生存质量测定量表简表(World Health Organization on quality of life brief scale,WHOQOL-BREF评分)]。结果治疗1、2周后观察组的COPD治疗总有效率显著高于对照组,差异有统计学意义(P<0.05),2组的不良反应发生率比较,差异无统计学意义(P>0.05),治疗1、2周后观察组的COPD相关症状体征积分显著低于对照组,CAT评分构成则显著优于对照组,WHOQOL-BREF评分显著高于对照组,差异有统计学意义(P<0.05)。结论白葡奈氏菌片联合ICS+LABA治疗中重度COPD急性发作的疗效较好,且可显著改善患者的生活质量。
文摘In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fine aggregate, reduce the consumption of the natural resources and improve the durability of concrete. In this study, the effect of the fineness on the high temperature and sulphate resistances of concrete mortar specimens, produced with ground granulated blast-furnace slag (GBFS) replacing cement, is investigated. The compressive and flexural strength test results for all series related to durability effects, exposing temperature and solutions, exposure times for these durability effects, slag content and fineness are discussed. Conse- quently, the optimum slag contents are determined for producing the sulphate and high temperature resistant mortars.
基金Funded by the National Key R&D Program of China(No.2017YFB0309904)the 973 Program of China(No.2015CB655100)
文摘A numerical model was proposed to describe the modulus variation of mortar exposed to external sulfate attack and the effectivity was verified by experiments. The model joints statistical evolution of microcracks to effective elastic modulus with microcracks and is applied to predict the damage degree of mortar attacked by sulfate. The experimental results show that the model can predict the modulus variation development of the specimen and the microcraks density. The elastic modulus values calculated by the model are consistent with that measured by experiments. The model focuses on nucleation of microcracks and finds that the theoretical results of microcracks number density show a linear growth over time in mortar. Compared with other sulfate attack damage model, this model provides a more suitable damage evolution equation that can be used to analyze the chemically assisted damage.
文摘为实现高效、快速、客观地对对地攻击无人机自主作战效能进行评估,文中引入向量加权平均算法(Weighed Mean of Vectors Algorithm,INFO)和K折交叉验证方法对随机森林算法(Random Forest,RF)进行优化寻找最优参数组合,提出了基于优化随机森林的对地攻击无人机自主作战效能评估方法。首先,基于向量加权平均优化算法理论,对随机森林决策树模型数量以及最大深度两项超参数进行寻优。其次,结合对地攻击无人机作战任务,对自主作战效能评估的主要作战因素进行分析,归纳总结了对地攻击无人机自主作战效能评估指标体系,并建立了基于INFO-RF的无人机自主作战效能评估模型。最后,通过对评估模型进行实例验证并与其他方法进行对比分析,结果表明,相较于传统RF模型、GA-RF模型和SVM模型,INFO-RF模型输出结果具有较高的拟合度和更为精确的评估值,实例结果有效验证了所提方法的合理性和优化模型的可靠性。
