检索结果-南通市图书馆

Stochastic Bi-level Programming Model for Home Healthcare Scheduling Problems Considering the Degree of Satisfaction with Visit Time

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2021年第5期30卷 572-599页

作者： huichao chen Xinggang Luo Zhongliang Zhang Qing Zhou School of Management Hangzhou Dianzi University310018 HangzhouChina

Home health care(HHC)includes a wide range of healthcare services that are performed in customers'homes to help them *** the constantly increasing demand for health care,HHC policymakers are eager to address routing and scheduling problems from the perspective of *** this paper,a bi-level programming model for HHC routing and scheduling problems with stochastic travel times is proposed,in which the degree of satisfaction with the visit time is simultaneously *** upper-level model is formulated for customer assignment with the aim of minimizing the total operating cost,and the lower-level model is formulated as a routing problem to maximize the degree of satisfaction with the visit *** with Stackelberg game decision-making,the trade-off relationship between these two objectives can be achieved spontaneously so as to reach an equilibrium state.A three-stage hybrid algorithm combining an iterated local search framework,which uses a large neighborhood search procedure as a sub-heuristic,a set-partitioning model,and a post-optimization method is developed to solve the proposed *** experiments on a set of instances including 10 to 100 customers verify the effectiveness of the proposed model and algorithm.

关键词： Home health care bi-level programming stochastic travel times routing meta-heuristic

Characterization of a New HIV-1 Circulating Recombinant Form CRF142_BC—Yunnan,China,2015 and 2021

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第42期6卷 1080-1085页

作者： Min chen huichao chen Shouxiong Lei Jie Dai Yanling Ma Manhong Jia Yunnan Provincial Key Laboratory of Public Health and Biosafety&Health Laboratory Center Yunnan Center for Disease Control and PreventionKunming CityYunnan ProvinceChina Institute for AIDS/STD Control and Prevention Yunnan Center for Disease Control and PreventionKunming CityYunnan ProvinceChina Division for AIDS/STD Control and Prevention Zhaotong Center for Disease Control and PreventionZhaotong CityYunnan ProvinceChina Yunnan Provincial Key Laboratory of Public Health and Biosafety&Institute for AIDS/STD Control and Prevention Yunnan Center for Disease Control and PreventionKunming CityYunnan ProvinceChina

What is already known about this topic?Recombinant strains dominate the human immunodeficiency virus 1(HIV-1)epidemic in *** Province was the first region in China to report HIV-1 infections in *** long-term HIV-1 epidemic led to the generation of various recombinant *** the 47 circulating recombinant forms(CRFs)reported in China,more than 20 were first identified in Yunnan *** is added by this report?This study reported a previously unrecognized HIV-1 CRF(CRF142_BC)characterized by the insertion of four short subtype B fragments into the subtype C ***142_BC was estimated to have emerged in the mid-1990s,close to the time of the emergence of most known CRF_BCs in *** are the implications for public health practice?The discovery of new CRFs will provide a basis for HIV-1 molecular tracing and intervention *** addition,HIV-1 recombination can alter viral biological *** study of HIV-1 gene variants needs to be intensified.

关键词： properties. China. intensified

Adaptive 3D Routing Protocol for Flying Ad Hoc Networks Based on Prediction-Driven Q-Learning

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2022年第5期19卷 302-317页

作者： Min Zhang Chao Dong Simeng Feng Xin Guan huichao chen Qihui Wu The Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Software Engineering Tongji UniversityShanghai 201804China

The routing protocols are paramount to guarantee the Quality of Service(QoS)for Flying Ad Hoc Networks(FANETs).However,they still face several challenges owing to high mobility and dynamic *** paper mainly focuses on the adaptive routing protocol and proposes a Three Dimensional Q-Learning(3DQ)based routing protocol to guarantee the packet delivery ratio and improve the *** 3DQ routing,we propose a Q-Learning based routing decision scheme,which contains a link-state prediction module and routing decision *** link-state prediction module allows each Unmanned Aerial Vehicle(UAV)to predict the link-state of Neighboring UAVs(NUs),considering their Three Dimensional mobility and packet ***,UAV can produce routing decisions with the help of the routing decision module considering the *** evaluate the various performance of 3DQ routing,and simulation results demonstrate that 3DQ can improve packet delivery ratio,goodput and delay of baseline protocol at most 71.36%,89.32%and 83.54%in FANETs over a variety of communication scenarios.

关键词： routing unmanned aerial vehicles(UAVs) flying ad hoc networks(FANETs) prediction Q-Learning

Carbon dioxide capture using polyethylenimine-loaded mesoporous carbons

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第1期25卷 124-132页

作者： Jitong Wang huichao chen Huanhuan Zhou Xiaojun Liu Wenming Qiao Donghui Long Licheng Ling State Key Laboratory of Chemical Engineering East China University of Science and Technology

A high efficiency sorbent for CO2 capture was developed by loading polyethylenimine （PEI） on mesoporous carbons which possessed well-developed mesoporous structures and large pore volume. The physicochemical properties of the sorbent were characterized by N2 adsorption/desorption, scanning electron microscopy （SEM）, thermal gravimetric analysis （TG） and Fourier transform infrared spectroscopy （FT-IR） techniques followed by testing for CO2 capture. Factors that affected the sorption capacity of the sorbent were studied. The sorbent exhibited extraordinary capture capacity with CO2 concentration ranging from 5% to 80%. The optimal PEI loading was determined to be 65 wt.% with a CO2 sorption capacity of 4.82 mmol-CO2/g-sorbent in 15% CO2/N2 at 75℃, owing to low mass-transfer resistance and a high utilization ratio of the amine compound （63%）. Moisture had a promoting effect on the sorption separation of CO2. In addition, the developed sorbent could be regenerated easily at 100℃, and it exhibited excellent regenerability and stability. These results indicate that this PEI-loaded mesoporous carbon sorbent should have a good potential for CO2 capture in the future.

关键词： carbon dioxide capture polyethylenimine mesoporous carbon amine utilization ratio

白云石煅烧/加压碳酸化循环捕获CO_2实验研究

在线全文

学校读者我要写书评

暂无评论

东南大学学报（自然科学版） 2013年第3期43卷 553-558页

作者：陈惠超赵长遂东南大学能源与环境学院南京210096 东南大学能源热转换及其过程测控教育部重点实验室南京210096

在双固定床反应器系统上采用提高碳酸化反应压力的方法来改善白云石的CO2循环捕获性能.对白云石在不同碳酸化反应压力、温度、碳酸化气氛与煅烧气氛中CO2浓度以及颗粒粒径等条件下的循环碳酸化特性进行测试,并与石灰石的循环特性进行比... 详细信息

在双固定床反应器系统上采用提高碳酸化反应压力的方法来改善白云石的CO2循环捕获性能.对白云石在不同碳酸化反应压力、温度、碳酸化气氛与煅烧气氛中CO2浓度以及颗粒粒径等条件下的循环碳酸化特性进行测试,并与石灰石的循环特性进行比较.结果表明,提高碳酸化反应压力有利于提高白云石的循环碳酸化转化率.反应压力一定,白云石的碳酸化转化率随碳酸化温度的增加呈先增加后减小的趋势.在700～750℃和0.5 MPa条件下,白云石获得较高的碳酸化转化率.白云石的加压循环碳酸化反应对一定的粒径范围和煅烧气氛具有较好的适应性.白云石的加压循环碳酸化性能较石灰石优越.

关键词：白云石煅烧加压碳酸化 CO2捕获

在线全文

学校读者我要写书评

暂无评论

建设工程合同管理风险防范与控制

施工技术 2010年第1期39卷 108-110页

作者：陈慧超中国建筑一局(集团)有限公司北京100161

实施合同管理风险防范与控制是降低经营风险、提高经济效益、增强竞争力的关键环节,需要在合同管理的全过程进行风险防范与控制。分析了在市场经济条件下合同管理风险的主要表现形式、合同管理风险的成因和实施合同管理风险防范与控制... 详细信息

实施合同管理风险防范与控制是降低经营风险、提高经济效益、增强竞争力的关键环节,需要在合同管理的全过程进行风险防范与控制。分析了在市场经济条件下合同管理风险的主要表现形式、合同管理风险的成因和实施合同管理风险防范与控制的措施。指出加强合同管理风险的分析预测和研究,建立健全合同管理风险防范与控制体系,是降低风险、提高经济效益的有效途径。

关键词：建设工程合同管理风险防范控制方法体系建设

在线全文

学校读者我要写书评

暂无评论

烟气中水蒸气对钙基吸收剂碳酸化的影响特性

化工学报 2013年第4期64卷 1364-1372页

作者：陈惠超赵长遂沈鹏能源热转换及其过程测控教育部重点实验室东南大学能源与环境学院江苏南京210096

在循环煅烧/碳酸化反应系统上考察煅烧气氛和碳酸化气氛中水蒸气含量以及CO2分压对钙基吸收剂成型颗粒碳酸化的影响,通过对钙基吸收剂微观结构分析(扫描电镜、氮吸附分析)以理解水蒸气影响碳酸化特性的机理。结果表明,煅烧气氛和碳酸化... 详细信息

在循环煅烧/碳酸化反应系统上考察煅烧气氛和碳酸化气氛中水蒸气含量以及CO2分压对钙基吸收剂成型颗粒碳酸化的影响,通过对钙基吸收剂微观结构分析(扫描电镜、氮吸附分析)以理解水蒸气影响碳酸化特性的机理。结果表明,煅烧气氛和碳酸化气氛中的水蒸气均可提高钙基吸收剂的碳酸化转化率,水蒸气含量分别为10%和5%时,吸收剂的碳酸化性能较好;水蒸气在碳酸化气氛中对高铝水泥改性吸收剂的改善作用较石灰石显著。煅烧气氛中的CO2分压越高,烧结现象越严重,降低钙基吸收剂的捕集效率;碳酸化气氛CO2分压提高,有利于提高钙基吸收剂的碳酸化转化率。烟气中水蒸气丰富了吸收剂的微观孔隙,使得吸收剂捕集CO2性能得到改善。

关键词：水蒸气钙基吸收剂碳酸化

CO_2载体CaO循环煅烧/碳酸化反应的分形特征

在线全文

学校读者我要写书评

暂无评论

化工学报 2009年第9期60卷 2284-2291页

作者：李英杰赵长遂陈惠超东南大学能源与环境学院江苏南京210096

捕捉煤燃烧释放出的CO2时,作为CO2载体的CaO微观结构特性对其循环碳酸化性能具有显著影响。采用分形维数作为表征CaO微观结构的特征参数,研究在循环煅烧/碳酸化反应过程中CaO的分形特征及其对CO2捕捉性能的影响规律。结果表明,随着循环... 详细信息

捕捉煤燃烧释放出的CO2时,作为CO2载体的CaO微观结构特性对其循环碳酸化性能具有显著影响。采用分形维数作为表征CaO微观结构的特征参数,研究在循环煅烧/碳酸化反应过程中CaO的分形特征及其对CO2捕捉性能的影响规律。结果表明,随着循环次数的增加CaO分形维数逐渐下降,CaO孔道也由粗糙和不规则变得越来越平滑和有规则性。煅烧温度升高则CaO分形维数下降。分形维数较大的CaO具有较高的碳酸化速率。在碳酸化过程的前10min内CaO的分形维数迅速减小,此后随时间变化缓慢。在分形维数D≤2.61的实验范围内,CaO分形维数与其循环碳酸化转化率呈线性正相关;当D>2.61时,可能存在临界分形维数Dcr,当D>Dcr时随着分形维数的进一步增大CaO转化率反而减小。

关键词： CO2载体 CaO 煅烧/碳酸化循环反应分形特征

循环煅烧/碳酸化反应中CaO微观结构变迁特性

在线全文

学校读者我要写书评

暂无评论

东南大学学报（自然科学版） 2009年第2期39卷 262-268页

作者：李英杰赵长遂陈惠超东南大学能源与环境学院南京210096

对CaO在循环反应中的碳酸化特性和微观结构变迁特性进行了研究.研究表明,CaO在700℃碳酸化时能取得最佳的CO2捕捉性能,高煅烧温度不利于CaO的碳酸化.随着循环次数的增加,CaO的孔隙由粗糙、具有网状连接和多孔的结构逐渐向平滑、孔间连... 详细信息

对CaO在循环反应中的碳酸化特性和微观结构变迁特性进行了研究.研究表明,CaO在700℃碳酸化时能取得最佳的CO2捕捉性能,高煅烧温度不利于CaO的碳酸化.随着循环次数的增加,CaO的孔隙由粗糙、具有网状连接和多孔的结构逐渐向平滑、孔间连接较差和较少孔的结构转变.CaO比表面积和比孔容均随循环次数增加而减小.前10次循环反应使CaO比表面积衰减迅速,此后变化缓慢.随着循环次数的增加,CaO的孔容和孔表面积分布均变差,CaO平均孔径逐渐增大.每次循环中,CaO中孔（2-50nm）的孔表面积大于大孔（大于50nm）的孔表面积.CaO碳酸化转化率随其比表面积和比孔容增加而增大,但当超过比表面积和比孔容的临界值后其转化率则可能减小.

关键词： CaO 循环反应微观结构 CO2捕捉