检索结果-南通市图书馆

利用极值蚁群优化的制粉出力建模变量选择算法

在线全文

学校读者我要写书评

暂无评论

西安交通大学学报 2011年第10期45卷 7-12页

作者：贾立新郑伊飞曹晖西安交通大学电力设备电气绝缘国家重点实验室西安710049

针对制粉出力难以直接测量,以及制粉系统包含变量多且各变量间耦合性强的问题,提出了一种利用极值蚁群优化的制粉出力建模变量选择法,并采用支持向量机根据所选变量建立了制粉出力的预测模型.该算法基于蚁群优化的正反馈原理,对蚂蚁搜... 详细信息

针对制粉出力难以直接测量,以及制粉系统包含变量多且各变量间耦合性强的问题,提出了一种利用极值蚁群优化的制粉出力建模变量选择法,并采用支持向量机根据所选变量建立了制粉出力的预测模型.该算法基于蚁群优化的正反馈原理,对蚂蚁搜索到的各个变量的相对重要性加以区分,并根据幂律分布选择重要性较小的变量进行变异,使得较差解不断得到改善,从而引导蚂蚁朝着最优解的方向搜索.采用制粉系统现场数据对所提算法、蚁群算法和蚁群遗传算法进行比较,结果表明,所提算法具有更快的收敛速度,且由其所选变量建立的制粉出力模型具有较高的预测精度.

关键词：制粉系统制粉出力变量选择极值蚁群优化

在线全文

学校读者我要写书评

暂无评论

基于SDN与NFV的服务功能链编排算法

北京邮电大学学报 2022年第2期45卷 85-90页

作者：贾雨宁魏翼飞周军华北京邮电大学电子工程学院北京100876 北京市复杂产品先进制造工程研究中心北京市仿真中心北京100854

在服务功能链(SFC)部署的资源编排问题中,基于软件定义网络(SDN)与网络功能虚拟化(NFV)融合的技术背景和SDN控制器、网络功能虚拟化与物理底层计算资源层组成的3层架构,提出了一种基于SDN和NFV的主动控制资源优化算法。首先通过多标准... 详细信息

在服务功能链(SFC)部署的资源编排问题中,基于软件定义网络(SDN)与网络功能虚拟化(NFV)融合的技术背景和SDN控制器、网络功能虚拟化与物理底层计算资源层组成的3层架构,提出了一种基于SDN和NFV的主动控制资源优化算法。首先通过多标准的聚合多准则效用算法对用户效用进行建模,将优化目标转化为最大化用户效用的问题;然后根据算法对未来状态的预测以及对网络利用率的实时监控,对到达的SFC请求进行决策并发出控制指令,以此为依据占用虚拟化网络功能持有的底层资源。仿真结果表明,与静态的时序资源分配算法相比,主动控制资源优化算法在资源利用率、接受率、创造用户效用等方面具有更好的性能。

关键词：软件定义网络网络功能虚拟化服务功能链资源分配

Cell membrane tensile strain under cyclic compression:A viscoelastic myoblast finite element model

在线全文

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2022年第4期16卷 87-94页

作者： Jingyi jia Shurui Chong Lu Yu yifei Yao School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai200030China Engineering Research Center of Digital Medicine and Clinical Translation Ministry of EducationShanghai Jiao Tong UniversityShanghai200030China

Cyclic mechanical stimulation could lead to subsequent biomechanical and biological effects on *** cells could deform or show energy dissipation with hysteresis behavior in response to external cyclic *** aim of this study was to investigate the effect of cyclic compression on a single viscoelastic myoblast through a confocal–based cell–specific finite element model,including cell membrane tensile strain and damaged *** compression was applied to the apical surface of the myoblast(cell membrane)with compressive stress of 500500 Pa(with stress offset at 500 Pa and amplitude of 500 Pa)at 0 Hz(static compression of 500 Pa),0.25 Hz,0.5 Hz,0.75 Hz,1 Hz,5 Hz,and 10 *** showed that the ratio of average tensile strain integral in all cell membrane elements over a certain period of time(T)to that duration(T)(MAS index)decreased under cyclic compression compared to that of static compression in the short term(within 4 s).Furthermore,compared to static compression,the percentage of damaged elements of cell membrane under cyclic compression decreased assuming a 3%cell membrane tensile strain damage *** optimal cyclic compression frequency 0.25 Hz led to the largest difference of MAS index under cyclic compression and static *** results may provide support for the application of cyclic compressive stimulation in the prevention of cell damage.

关键词： Cell membrane tensile strain Viscoelasticity Cyclic compression Finite element analysis

引入聚类分析的光伏出力建模及其在可靠性评估中的应用

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

电力系统自动化 2016年第23期40卷 93-100页

作者：郭一飞高厚磊田佳电网智能化调度与控制教育部重点实验室(山东大学) 山东省济南市250061 国网山东省电力公司潍坊供电公司山东省潍坊市261021

对光伏系统出力的建模是评估其容量价值及进行规划的前提,太阳辐照强度的随机性和波动性是其建模的难点。文中引入聚类分析理论,从数据挖掘的角度对光伏出力进行了建模,并将其用于含光伏发电的系统可靠性评估。首先,对传统模糊C-均值(F... 详细信息

对光伏系统出力的建模是评估其容量价值及进行规划的前提,太阳辐照强度的随机性和波动性是其建模的难点。文中引入聚类分析理论,从数据挖掘的角度对光伏出力进行了建模,并将其用于含光伏发电的系统可靠性评估。首先,对传统模糊C-均值(FCM)聚类算法进行了改进,解决了其对迭代初值敏感的问题。其次,利用改进的FCM算法对历史辐照数据进行了聚类分析,确定了聚类数和聚类中心,建立了太阳辐照的时序聚类模型。最后,基于所述模型和蒙特卡洛模拟(MCS)法提出了含光伏电站的发电系统可靠性评估方法。对IEEE-RTS测试系统的测试结果验证了所述模型和方法的有效性和高效性。

关键词：太阳辐照强度光伏发电聚类分析模糊C-均值算法蒙特卡洛模拟可靠性评估

在线全文

学校读者我要写书评

暂无评论

中医药治疗支气管扩张症多中心随机对照研究

中国中西医结合杂志 2024年第2期44卷 156-162页

作者：李建生王至婉王佳佳崔红生周淼马战平黄海茵罗伟贤王允秀田媛河南中医药大学呼吸疾病中医药防治省部共建协同创新中心/河南省中医药防治呼吸病重点实验室郑州450046 河南中医药大学第一附属医院呼吸科郑州450000 北京中医药大学第三附属医院呼吸科北京100029 河南中医药大学第三附属医院呼吸科郑州450003 陕西省中医医院呼吸科西安710003 上海中医药大学附属岳阳中西医结合医院呼吸科上海200437 郑州市第一人民医院中医科郑州450004

目的评价中医药治疗支气管扩张症的临床疗效与安全性。方法采用多中心、随机对照试验设计,将216例支气管扩张症患者随机分为试验组和对照组,每组108例。试验组根据中医辨证不同,肺脾气虚兼痰湿阻肺证给予补肺化痰方颗粒剂,气阴两虚兼... 详细信息

目的评价中医药治疗支气管扩张症的临床疗效与安全性。方法采用多中心、随机对照试验设计,将216例支气管扩张症患者随机分为试验组和对照组,每组108例。试验组根据中医辨证不同,肺脾气虚兼痰湿阻肺证给予补肺化痰方颗粒剂,气阴两虚兼痰热壅肺证给予益肺清化方颗粒剂,对照组给予安慰剂,治疗24周,随访24周。主要结局指标为急性加重次数,次要结局指标包括首次出现急性加重时间、肺功能[第1秒用力呼气容积(FEV1)、FEV1占预计值百分比、用力肺活量(FVC)、FEV1/FVC]和生活质量[圣·乔治呼吸问卷(SGRQ)、莱塞斯特咳嗽问卷(LCQ)和支气管扩张症生活质量问卷(QoL-B)评分]。结果试验组96例、对照组90例完成研究并纳入统计分析。与本组治疗前1年比较,试验组研究期间急性加重次数降低(P<0.01)。与本组治疗前比较,试验组治疗及随访24周FEV1占预计值百分比均升高,治疗12、24周、随访24周SGRQ不同程度降低,LCQ及QoL-B评分不同程度升高(P<0.05,P<0.01);对照组治疗24周FEV1、FEV1占预计值百分比、FVC升高,随访24周FVC升高,治疗12、24周、随访24周SGRQ不同程度降低,LCQ及QoL-B评分不同程度升高(P<0.05,P<0.01)。与对照组比较,试验组首次出现急性加重的时间延长(P<0.05)。与对照组同期比较,试验组治疗12周SGRQ症状领域评分降低,LCQ生理领域评分、QoL-B呼吸症状领域评分升高(P<0.05);治疗24周急性加重次数、SGRQ总评分及各领域评分降低,LCQ总评分及各领域评分、QoL-B各领域评分升高(P<0.05,P<0.01);随访24周急性加重次数、SGRQ总评分及各领域评分降低,LCQ总评分及各领域评分、QoL-B身体功能领域、健康感觉领域、生命活力领域、情绪功能领域、角色功能领域、社会功能领域、呼吸症状领域评分升高(P<0.05,P<0.01)。结论中医辨证治疗支气管扩张症具有较好的临床疗效和安全性,能够减少急性加重次数,缓解临床症状并提高生活质量。(***,***03443531)

关键词：支气管扩张症中医辨证治疗急性加重生活质量随机对照试验

Self-assembled supramolecular materials for photocatalytic H_(2)production and CO_(2)reduction

在线全文

学校读者我要写书评

暂无评论

Materials Futures 2022年第4期1卷 94-119页

作者： jia Tian Junlai Yu Qingxuan Tang jiangshan Zhang Danying Ma yifei Leiand Zhan-Ting Li Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032People’s Republic of China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan University2205 Songhu RoadShanghai 200438People’s Republic of China

Photosynthetic organisms harness solar radiation to produce energy-rich compounds from water and atmospheric CO_(2)via exquisite supramolecular assemblies,which offers a design principle for highly efficient artificial photocatalytic *** an emerging research field,significant effort has been devoted to self-assembled supramolecular materials for photocatalytic H_(2)production and CO_(2)*** this review,we introduce the basic concepts of supramolecular photocatalytic *** that,we will discuss recent advances in the preparation of supramolecular photocatalytic materials from zero-dimension to three-dimension which include molecular assemblies,micelles,hybrid nanoparticles,nanofibers,nanosheets,microcrystals,lipid bilayers,supramolecular organic frameworks,supramolecular metal-organic frameworks,gels,and host-guest metal-organic frameworks,***,we show the recent progress in the photocatalytic properties of supramolecular photocatalytic materials,*** proton reduction,water splitting,CO_(2)to HCOOH,CO_(2)to CO,CO_(2)to CH4 conversions,***,we provide our perspective for the future research,with a focus on the development of new structures and highly efficient photocatalysis.

关键词： supramolecular materials self-assembly photocatalysis hydrogen production carbon dioxide reduction

Haploidentical hematopoietic stem cell transplantation may improve long-term survival for children with high-risk T-cell acute lymphoblastic leukemia in first complete remission

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

Chinese Medical Journal 2022年第8期135卷 940-949页

作者： Zhang Yongzhan Bai Lu Cheng yifei Lu Aidong Wang Yu Wu Jun Zhang Xiaohui Zuo Yingxi Xu Lanping jia Yueping Huang Xiaojun Zhang Leping Department of Pediatrics Peking University People's HospitalPeking UniversityBeijing 100044China Department of Hematology Peking University People's HospitalPeking University Institute of HematologyNational Clinical Research Center for Hematologic DiseaseBeijing Key Laboratory of Hematopoietic Stem Cell TransplantationBeijing 100044China Department of Pediatrics Peking University Shougang HospitalPeking UniversityBeijing 100144China Department of Research Unit of Key Technique for Diagnosis and Treatments of Hematologic Malignancies Chinese Academy of Medical Sciences2019RU029BeijingChina.

Background: The role of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in children with high-risk (HR) T-cell acute lymphoblastic leukemia (T-ALL) in first complete remission (CR1) is still under evaluation. Moreover, relapse is the main factor affecting survival. This study aimed to explore the effect of allo-HSCT (especially haploidentical HSCT [haplo-HSCT]) on improving survival and reducing relapse for HR childhood T-ALL in CR1 and the prognostic factors of childhood T-ALL in order to identify who could benefit from ***: A total of 74 newly diagnosed pediatric T-ALL patients between January 1, 2012 and June 30, 2018 were enrolled in this retrospective study. Patients were stratified into the low-risk chemotherapy cohort (n = 16), HR chemotherapy cohort (n = 31), and HR transplant cohort (n = 27). Characteristics, survival outcomes, and prognostic factors of all patients were then ***: Patient prognosis in the HR chemotherapy cohort was significantly worse than that in the low-risk chemotherapy cohort (5-year overall survival [OS]: 58.5%vs. 100%,P = 0.003;5-year event-free survival [EFS]: 54.1%vs. 83.4%,P = 0.010;5-year cumulative incidence of relapse [CIR]: 45.2%vs. 6.3%,P = 0.011). In HR patients, allo-HSCT improved the 5-year EFS and CIR compared to that of chemotherapy (5-year EFS: 80.1%vs. 54.1%,P = 0.041;5-year CIR: 11.6%vs. 45.2%,P = 0.006). The 5-year OS was higher in the HR transplant cohort than that in the HR chemotherapy cohort (81.0%vs. 58.5%,P = 0.084). Minimal residual disease re-emergence was an independent risk factor for 5-year OS, EFS, and CIR;age ≥10 years was an independent risk factor for OS and EFS;and high white blood cell count was an independent risk factor for EFS and ***: Allo-HSCT, especially haplo-HSCT, could effectively reduce relapse of children with HR T-ALL in CR1.

关键词： T-cell acute lymphoblastic leukemia Allogeneic hematopoietic stem cell transplantation Haploidentical Minimal residual disease Children

PGE2 receptor 3 subtype（EP3）regulates adipose metabolism in mice

在线全文

学校读者我要写书评

暂无评论

PGE2 receptor 3 subtype（EP3）regulates adipose metabolism i...

加载物吸收截面和材料介电常数对混响室品质因子的影响

中国生理学会第24届全国会员代表大会暨生理学学术大会

作者：徐虎 yifei Miao Sha Li jialin Fu Shizheng Huang Shengnan Du jia Liu Xiaoyan Zhang Youfei Guan 北京大学 Department of Physiology and Pathophysiology Peking University Health Science Center Astra Zeneca-Shenzhen University Joint Institute of Nephrology Shenzhen University Health Science Center

Preadipocyte and adipocyte are two major cell types that exist in white adipose tissue（WAT）.The differentiation of preadipocyte increases the number of mature adipocyte and governs fat ***（TG）in adipose tissue is the main energy storage form in *** breakdown of TG,termed lipolysis,in adipocyte produces glycerol and free fatty acid（FFA）,which is released to circulatory system to supply energy for various *** imbalance of adipogenesis and adipocyte lipolysis and hypertrophy in WAT account for the development of obesity under over-nutrition *** development of obesity also depends on the function of brown adipose tissue（BAT）.Prostaglandin E2（PGE2）is the predominant prostaglandin produced in adipose tissue and plays an important role in the regulation of adipose tissue functions through its four receptors,i.e.,EP1,EP2,EP3,and *** study showed that the EP3 receptor deficient mice exhibited increased night eating frequency and developed obesity and insulin ***,the underlying mechanism remains *** aimed to investigate the impact of EP3 receptor on both WAT and BAT functions and its contribution to the development of *** demonstrated that global EP3 receptor gene deficiency in mice（EP3-/-）resulted in reduced locomotion,increased food intake and spontaneous obesity,with an enhanced ***3-/-mice also exhibited increased adipocyte size,WAT mass and body weight,mainly due to enhanced preadipocyte ***,the lipolysis process was also activated in the WAT of EP3-/-mice via the stimulation of the c AMP/protein kinase A（PKA）/hormone sensitive lipase（HSL）pathway,which promoted excessive lipid ectopic deposition in liver and mild insulin *** the condition of 24h fasting,EP3-/-mice displayed higher serum glycerol level but less lipid deposition in liver than that in EP3+/+*** also found that EP3-/-mice exhibited more BAT content and lower respiratory quotient（R

关键词： PGE2 receptor 3 subtype adipose lipogenesis lipolysis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

高电压技术 2014年第6期40卷 1762-1767页

作者：贾锐王庆国王树峤刘逸飞军械工程学院静电与电磁防护研究所石家庄050003

为实现混响室(RC)品质因子Q的科学评估、研究混响室腔体加载物对Q的影响,分析了腔室内能量的耗散途径。将加载物等效为一系列能够吸收反射电磁能量的球形介质,通过计算介质球吸收截面,给出了Q的表达式,并建立混响室模型对Q进行数值计算... 详细信息

为实现混响室(RC)品质因子Q的科学评估、研究混响室腔体加载物对Q的影响,分析了腔室内能量的耗散途径。将加载物等效为一系列能够吸收反射电磁能量的球形介质,通过计算介质球吸收截面,给出了Q的表达式,并建立混响室模型对Q进行数值计算。研究了Q与加载物材料、尺寸的关系。结果表明,当频率>1.2 GHz时,Q的计算结果与实际测量结果相符;Q与加载物吸收截面成反比,与加载物介电常数及入射电磁波频率成正比。

关键词：吸收截面加载物介电常数品质因子混响室能量耗散