检索结果-南通市图书馆

同方期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

货运电动汽车送货路径规划研究

机械设计与制造 2025年第1期407卷 82-87页

作者：周建军李林陈飞成都工业职业技术学院四川成都610218 成都师范学院四川成都611130 西华大学四川成都610039

为降低货运电动汽车送货路径规划成本,提出耦合配电网络能量管理与电池交换站定位规划的货运电动汽车送货路径规划新模型。在该模型中,电池交换站的位置同时受到路径变量和配电网变量的影响,即每个电池交换站的定位都考虑到了配电线路... 详细信息

为降低货运电动汽车送货路径规划成本,提出耦合配电网络能量管理与电池交换站定位规划的货运电动汽车送货路径规划新模型。在该模型中,电池交换站的位置同时受到路径变量和配电网变量的影响,即每个电池交换站的定位都考虑到了配电线路上的能量损失和电动汽车行进距离。为验证所提出模型的性能,搭建了三个配电网测试系统和两种规划场景(耦合场景和解耦场景)。测试结果表明,当执行耦合场景时,电池交换站被定位在靠近变电站的节点;此时,相比于解耦场景,货运电动汽车送货路径规划的总成本最低。所提模型与已有模型对测试系统的货运电动汽车送货路径规划对比结果表明,所构建模型比已有模型具有更低的规划成本和更少的电动汽车续航里程增幅。

关键词：货运电动汽车路径规划电池交换站

考虑快速变负荷和灵活性供需匹配的耦合系统优化调度

在线全文

学校读者我要写书评

暂无评论

电力系统自动化 2025年第1期49卷 117-127页

作者：周念成戴旭晖池源徐飞常东锋输变电装备技术全国重点实验室(重庆大学) 重庆市400044 电力系统及发电设备控制和仿真国家重点实验室(清华大学) 北京市100084 西安热工研究院有限公司陕西省西安市710054

可再生能源与快速变负荷改造的火电机组在同一并网点对外形成耦合系统,是提升沙漠、戈壁、荒漠等灵活性发电资源缺乏而可再生能源比例较高地区灵活性的有效手段。为了挖掘火电机组改造后的耦合系统经济性与灵活性,文中提出一种风光火耦... 详细信息

可再生能源与快速变负荷改造的火电机组在同一并网点对外形成耦合系统,是提升沙漠、戈壁、荒漠等灵活性发电资源缺乏而可再生能源比例较高地区灵活性的有效手段。为了挖掘火电机组改造后的耦合系统经济性与灵活性,文中提出一种风光火耦合系统多目标优化调度方法。首先,根据实际测算的火电机组灵活性改造后的运行煤耗数据,拟合了机组爬坡过程的煤耗计算公式,并分析了火电快速变负荷能力提高对耦合系统经济性和灵活性的影响。在此基础上,将日综合运行收益与灵活性供需匹配度作为目标函数,考虑包括阶梯式爬坡率在内的系统运行约束,构建多目标优化调度模型。通过在优化算法中使用分组关联多项式变异算子,提高了算法对维度较高、约束较复杂的电力系统多目标优化调度问题的求解能力。最后,以某地区耦合系统为例进行了优化调度仿真。结果表明,文中所述方法能够获得综合经济性与灵活性相对更优的耦合系统优化调度方案。

关键词：耦合系统调峰快速变负荷阶梯式爬坡率灵活性供需匹配多目标优化调度

加味茵陈蒿汤治疗湿热中阻型乙型病毒性肝炎患者的效果

在线全文

学校读者我要写书评

暂无评论

中外医学研究 2025年第4期23卷 1-5页

作者：滕飞骆欢武威市凉州医院甘肃武威733000

目的:探讨加味茵陈蒿汤治疗湿热中阻型乙型病毒性肝炎患者的效果。方法:纳入2022年5月—2023年12月于武威市凉州医院就诊的98例湿热中阻型乙型病毒性肝炎患者作为研究对象,采用随机数表法分为对照组与观察组,各49例。对照组行西医常规治... 详细信息

目的:探讨加味茵陈蒿汤治疗湿热中阻型乙型病毒性肝炎患者的效果。方法:纳入2022年5月—2023年12月于武威市凉州医院就诊的98例湿热中阻型乙型病毒性肝炎患者作为研究对象,采用随机数表法分为对照组与观察组,各49例。对照组行西医常规治疗,观察组在对照组基础上联合加味茵陈蒿汤治疗,治疗2周后比较两组血清白细胞介素-10(interleukin-10,IL-10)、白细胞介素-8(interleukin-8,IL-8)、内毒素、血清谷草转氨酶(glutamic-oxaloacetic transaminase,AST)、乙型肝炎病毒(hepatitis B virus,HBV)-DNA、甲胎蛋白(alpha-fetoprotein,AFP)、总胆红素(total bilirubin,TBIL)、谷丙转氨酶(glutamic-pyruvic transaminase,ALT)、中医症状积分及临床疗效。结果:治疗后,两组血清IL-10升高,血清AFP、IL-8、内毒素、HBV-DNA及主症、次症积分降低,且观察组血清IL-10高于对照组,血清IL-8、AFP、内毒素、HBV-DNA及主症、次症积分低于对照组,差异有统计学意义(P<0.05);观察组总有效率高于对照组,差异有统计学意义(P<0.05)。结论:加味茵陈蒿汤治疗湿热中阻型乙型病毒性肝炎患者临床效果显著,有助于减轻炎症反应,促进肝功能恢复,降低病毒水平,辅助提高临床效果。

关键词：加味茵陈蒿汤乙型病毒性肝炎湿热中阻型白细胞介素-8 内毒素肝功能症状积分

Reduced-order proper orthogonal decomposition extrapolating finite volume element format for two-dimensional hyperbolic equations

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2017年第2期38卷 289-310页

作者： Zhendong luo fei TENG School of Mathematics and Physics North China Electric Power University Beijing 102206 China School of Control and Computer Engineering North China Electric Power University Beijing 102206 China

This paper is concerned with establishing a reduced-order extrapolating fi- nite volume element （FVE） format based on proper orthogonal decomposition （POD） for two-dimensional （2D） hyperbolic equations. For this purpose, a semi discrete variational format relative time and a fully discrete FVE format for the 2D hyperbolic equations are built, and a set of snapshots from the very few FVE solutions are extracted on the first very short time interval. Then, the POD basis from the snapshots is formulated, and the reduced-order POD extrapolating FVE format containing very few degrees of freedom but holding sufficiently high accuracy is built. Next, the error estimates of the reduced-order solutions and the algorithm procedure for solving the reduced-order for- mat are furnished. Finally, a numerical example is shown to confirm the correctness of theoretical conclusions. This means that the format is efficient and feasible to solve the 2D hyperbolic equations.

关键词： reduced-order finite volume element (FVE) extrapolating format properorthogonal decomposition (POD) hyperbolic equation error estimate numerical simula-tion

奖学金对大学生学习发展的影响效应及机制研究

在线全文

学校读者我要写书评

暂无评论

中国高教研究 2025年第2期 27-35页

作者：周溪亭郭菲史静寰西南财经大学公共管理学院清华大学教育研究院

奖学金作为高校学生资助的重要组成部分，其目的在于奖优育人，激励学生成长与发展。研究发现，获得奖学金的人群在背景特征上有一定差异；获得奖学金有助于提高学生学业成绩，促进知识、能力和自我认知发展；奖学金对学生学习与发展的... 详细信息

奖学金作为高校学生资助的重要组成部分，其目的在于奖优育人，激励学生成长与发展。研究发现，获得奖学金的人群在背景特征上有一定差异；获得奖学金有助于提高学生学业成绩，促进知识、能力和自我认知发展；奖学金对学生学习与发展的正面作用需通过提高学习投入来显现，尤其是情感投入。未来应坚持奖学金政策的普惠性原则，扩大受益学生群体，优化评定标准，加强对学生能力与素养的增值评价；同时，建立科学的奖学金实施效应追踪系统，对其实际资助效果进行定期评估和反馈。还需警惕奖学金制度可能导致的潜在问题，以进一步发挥奖学金“奖优育人”的功能，提升高校人才培养质量。

关键词：奖学金学生资助大学生资助育人学习发展

Realization of edge states along a synthetic orbital angular momentum dimension

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2025年第1期13卷 87-97页

作者： YU-WEI LIAO MU YANG HAO-QING ZHANG ZHI-HE HAO JUN HU TIAN-XIANG ZHU ZONG-QUAN zhou XI-WANG luo JIN-SHI XU CHUAN-FENG LI GUANG-CAN GUO CAS Key Laboratory of Quantum Information University of Science and Technology of China Anhui Province Key Laboratory of Quantum Network University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China

Synthetic dimensions have emerged as promising methodologies for studying topological physics, offering great advantages in controllability and flexibility. Photonic orbital angular momentum(OAM), characterized by discrete yet unbounded properties, serves as a potent carrier for constructing synthetic dimensions. Despite the widespread utilization of synthetic OAM dimensions in the investigation of topological physics, the demonstration of an edge along such dimensions has remained challenging, significantly constraining the exploration of important topological edge effects. In this study, we establish an edge within a Floquet Su–Schrieffer–Heeger OAM lattice, creating approximate semi-infinite lattices by introducing a pinhole in the optical elements within a cavity. Leveraging the spectral detection capabilities of the cavity, we directly measure the phase transitions of zero(±π) energy edge states, elucidating the principle of bulk-edge correspondence. Furthermore, we dynamically observe the migration of edge modes from the gap to the bulk by varying the edge phase, and we reveal that interference near the surface results in the discretization of the spectrum. We offer, to our knowledge,a novel perspective for investigating edge effects and provide an important photonic toolbox in topological photonics.

关键词： Beam splitters Information processing Optical elements Orbital angular momentum multiplexing Photonics Quantum information

Computational identification and evolutional analysis of Piwi subfamily in 11 Drosophila species

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2008年第6期15卷 537-544页

作者： Xue zhou Ya-Long Xu luo-Gen Cheng fei Li College of Life Science Nanjing Normal University Department of Entomology Nanjing Agricultural University Nanjing China

The complete genome sequences of 11 Drosophila species provide an opportunity to investigate the gene family evolution in closely related species. Drosophila Piwi subfamily, including three members, piwi, Aub and Ago3, has attracted increasing attention as it participates in the biogenesis of piRNA. Here, we identified 33 Piwi homologs from the genome of 11 Drosophila species. The full-length cDNA sequences ofpiwi and Aub genes were obtained by using New GENSCAN Web Server. The Ago3 homologs were difficult regarding full-length information because they had long introns. The genomic structure of Piwi subfamily genes are highly conserved among diverse Drosophila species. Insect piwi and Aub genes have long first introns. The average length of the first intron is 1 284 bp for piwi and 840 bp for Aub, which is much larger than those of other introns （93 bp for Piwi and 54 bp for Aub）. However, this phenomenon is not observed in mammalian piwi genes. We also found that there were abundant repeat sequences in both exons and introns of insect Ago3 genes. Due to recent insertions of long terminal repeat elements in four Drosophila species, part of the third introns exhibit higher conservation than adjacent exons and other introns. An evolutional tree created by Minimum Evolution method indicates that mammalian piwi genes are more closely related to the insect Ago3 Piwi subfamily.

关键词： evolution Drosophila genome intron Piwi subfamily

Clinical features of abnormalα-fetoprotein in 15 patients with chronic viral hepatitis B after treatment with antiviral drugs

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

World Journal of Hepatology 2025年第1期17卷 47-54页

作者： Man-Lei Jiang fei Xu Jin-Long Li Jia-Yu luo Jiang-Ling Hu Xian-Qiang Zeng Ganzhou Institute of Liver Disease Department of HepatologyGanzhou Fifth People's HospitalGanzhou 341000Jiangxi ProvinceChina

BACKGROUND Liver function of chronic hepatitis B(CHB)patients is essentially normal after treatment with antiviral *** rare cases,persistently abnormally elevatedα-fetoprotein(AFP)is seen in CHB patients following long-term antiviral ***,in the absence of imaging evidence of liver cancer,a reasonable expla-nation for this phenomenon is still *** To explore the causes of abnormal AFP in patients with CHB who were not diag-nosed with liver *** From November 2019 to May 2023,15 patients with CHB after antiviral treatment and elevated AFP were *** data and quality indicators related to laboratory testing,imaging data,and pathological data were obtained through inpatient medical *** All patients had increased AFP and significantly elevated *** was excluded by imaging *** four patients had elevated alanine ami-notransferase,10 had elevated aspartate aminotransferase,nine had elevated total bilirubin,and two had antinuclear *** liver biopsy and histopatho-logical examination indicated that 14 patients had rosette,moderate,or higher interfacial inflammation,lymphocyte infiltration,and severe hepatic fibers(11 cases),which was consistent with the pathological features of autoimmune hepa-titis(AIH).After 8-12 week of hormone therapy,the levels of AFP and IgG,and liver function returned to normal(P<0.05).CONCLUSION For patients with CHB and elevated AFP after antiviral treatment,autoimmune hepatitis should be *** with AIH is clinically insidious and difficult to detect,and prone to progression to *** puncture pathological examination should be performed when necessary to confirm diagnosis.

关键词： Abnormalα-fetoprotein Chronic viral hepatitis B Antiviral treatment Autoimmune hepatitis Hepatic pathology

基于联合仿真的电润湿三液体透镜结构参数优选方法

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

中国光学(中英文) 2025年第1期18卷 78-88页

作者：黄鹏宋跃周斐强周益航何国强谢中毅张鑫龙桂林理工大学机械与控制工程学院广西高校先进制造与自动化技术重点实验室广西桂林541006

电润湿三液体透镜具有优秀的变焦性能,但其结构复杂度和设计难度较大,因此,本文提出了一种基于联合仿真的电润湿三液体透镜结构参数优选方法。在设计某三液体透镜时,利用Comsol和Zemax软件建立了不同结构参数下的三液体透镜仿真模型,得... 详细信息

电润湿三液体透镜具有优秀的变焦性能,但其结构复杂度和设计难度较大,因此,本文提出了一种基于联合仿真的电润湿三液体透镜结构参数优选方法。在设计某三液体透镜时,利用Comsol和Zemax软件建立了不同结构参数下的三液体透镜仿真模型,得到了其在不同电压下的焦距,分析了高度和锥度对变焦范围和初始焦距的影响,确定了变焦范围最大且初始焦距最长的一组结构参数。为了验证该方法的可靠性,制备了不同高度和锥度的三液体透镜模型,并进行变焦实验。仿真与实验结果表明:三液体透镜的初始焦距与高度和锥度正相关;变焦范围与锥度正相关,但高度为主要影响因素;当高度为12 mm,锥度为20°时,透镜变焦范围最大,初始焦距最长。当锥度小于15°时,仿真与实验结果的吻合度较高。

关键词：电润湿三液体透镜联合仿真变焦实验参数优选