检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

某超高层建筑供配电系统设计探讨

建筑电气 2024年第1期43卷 8-12页

作者：丑凤麟中国建筑东北设计研究院有限公司沈阳市110006

通过大连某工程实例,介绍超高层公共建筑的供配电系统设计,包括负荷分级、供电电源、备用电源配置、变配电所及变压器选择,重点对高区变配电所不同位置及数量的设置方案进行比较分析,最后结合新版变压器能效标准介绍变压器的节能设计。

关键词：超高层建筑负荷分级供电半径高区变配电所自备电源柴油发电机变压器能效等级绿色建筑

冠状动脉造影与血管内超声心动图辅助PCI技术治疗冠心病的效果差异

在线全文

学校读者我要写书评

暂无评论

微创医学 2024年第3期19卷 250-253页

作者：仇昌智钦州市第二人民医院心血管内科广西钦州市535099

目的对比分析冠状动脉造影(CAG)与血管内超声心动图(IVE)辅助经皮冠状动脉介入治疗(PCI)技术治疗冠心病的效果差异。方法选择接受PCI技术治疗的90例冠心病患者为研究对象,依据患者于PCI术中选用影像学检查技术的不同,分为CAG组(CAG技术,... 详细信息

目的对比分析冠状动脉造影(CAG)与血管内超声心动图(IVE)辅助经皮冠状动脉介入治疗(PCI)技术治疗冠心病的效果差异。方法选择接受PCI技术治疗的90例冠心病患者为研究对象,依据患者于PCI术中选用影像学检查技术的不同,分为CAG组(CAG技术,n=45)和IVE组(IVE技术,n=45),比较两组患者的手术情况、临床结局及并发症的发生情况。结果IVE组患者的球囊扩张支架最大压力、管腔最大直径、PCI后管腔最小直径均大于CAG组,支架植入效果良好率高于CAG组(97.78%vs.82.22%),并发症发生率及心肌梗死、心绞痛住院的发生率均低于CAG组(均P<0.05)。结论在辅助PCI技术治疗冠心病中,相较于CAG,IVE可进一步提升支架植入效果、降低并发症发生率、改善患者临床结局。

关键词：冠心病经皮冠状动脉介入冠脉造影血管内超声心动图临床结局

Adaptive peer-to-peer streaming with MutualCast

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 737-748页

作者： chou Philip A Microsoft Research One Microsoft Way Redmond WA 98052 USA

Application Layer Multicast (ALM) can greatly reduce the load of a server by leveraging the outgoing bandwidth of the participating nodes. However, most proposed ALM schemes become quite complicated and lose bandwidth efficiency if they try to deal with networks that are significantly heterogeneous or time-varying. In earlier work, we proposed MutualCast, an ALM scheme with fully connected mesh that quickly adapts to the time-varying networks, while achieving provably optimal throughput performance. In this paper, we study how MutualCast can be paired with adaptive rate control for streaming media. Specifically, we combine Optimal Rate Control (ORC), our earlier control-theoretical framework for quality adaptation, with the MutualCast delivery scheme. Using multiple bit rate video content, we show that the proposed system can gracefully adjust the common quality received at all the nodes while maintaining a continuous streaming experience at each, even when the network undergoes severe, uncorrelated bandwidth fluctuations at different peer nodes.

关键词： Peer-to-peer streaming, Distribution capacity, Quality adaptation, MutualCast

在线全文

学校读者我要写书评

暂无评论

光动力疗法的抗肿瘤免疫效应研究进展

解放军医学杂志 2024年第6期49卷 718-725页

作者：侴雯馨孙天真顾瑛赵洪友北京理工大学医学技术学院北京100081 解放军总医院第一医学中心激光医学科北京100853

光动力疗法(PDT)作为一种新兴的肿瘤治疗手段,因不良反应较少、靶向性好、可重复治疗等优点,已被广泛应用于临床多种肿瘤的治疗。相较手术、化疗及放疗等传统治疗策略,PDT不仅可杀伤原位肿瘤,还可通过激活机体的免疫效应对转移瘤发挥抑... 详细信息

光动力疗法(PDT)作为一种新兴的肿瘤治疗手段,因不良反应较少、靶向性好、可重复治疗等优点,已被广泛应用于临床多种肿瘤的治疗。相较手术、化疗及放疗等传统治疗策略,PDT不仅可杀伤原位肿瘤,还可通过激活机体的免疫效应对转移瘤发挥抑制作用。然而,PDT诱导免疫效应的高低受多种因素影响,包括光敏剂在细胞内的定位和剂量、光参数、肿瘤内的氧浓度、免疫功能的完整性等。本文对PDT介导抗肿瘤免疫效应的相关机制,以及PDT免疫效应的主要影响因素进行综述,以探讨PDT用于肿瘤治疗的未来发展方向。

关键词：光动力疗法固有免疫特异性免疫影响因素

Measuring the orbital periods of low mass X-ray binaries in the X-ray band

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第11期14卷 1367-1382页

作者： Yi chou Graduate Institute of Astronomy National Central University

A low mass X-ray binary （LMXB） contains either a neutron star or a black hole accreting materials from its low mass companion star. It is one of the primary astrophysical sources for studying stellar-mass compact objects and accreting phe- nomena. As with other binary systems, the most important parameter of an LMXB is the orbital period, which allows us to learn about the nature of the binary system and constrain the properties of the system＇s components, including the compact ob- ject. As a result, measuring the orbital periods of LMXBs is essential for investigating these systems even though fewer than half of them have known orbital periods. This article introduces the different methods for measuring the orbital periods in the X-ray band and reviews their application to various types of LMXBs, such as eclipsing and dipping sources, as well as pulsar LMXBs.

关键词： X-rays: binaries -- binaries: close -- methods: data analysis

热电联产型共享储能的技经分析与市场机制研究

在线全文

学校读者我要写书评

暂无评论

全球能源互联网 2024年第2期7卷 190-200页

作者：冶兆年韩恺王永真何继江丑鹏北京理工大学能源与动力工程系北京市海淀区100085 北京理工大学重庆创新中心重庆市渝北区401120 清华大学社会科学学院能源转型与社会发展研究中心北京市海淀区100081 新疆鹏煜能源科技集团有限公司新疆维吾尔自治区哈密市839000

以可再生能源和储能为主体的新型能源系统建设已成为能源转型的发展趋势。针对当前电化学储能面临技术经济性差以及供用能在品质上存在不匹配的问题,基于能量梯级综合利用的理念和共享经济的模式,提出热电联产型共享储能系统的技术与业... 详细信息

以可再生能源和储能为主体的新型能源系统建设已成为能源转型的发展趋势。针对当前电化学储能面临技术经济性差以及供用能在品质上存在不匹配的问题,基于能量梯级综合利用的理念和共享经济的模式,提出热电联产型共享储能系统的技术与业态,探讨该类储能的基本运行原理、技术经济特性和商业模式。以高温固体蓄热、余热锅炉与汽轮机组成的典型热电联产型共享储能系统的案例分析表明,以固体蓄热为储能设备的热电联产型共享储能系统,在现有市场环境下实现系统经济性最优的容量配置和运行调度时,系统内部收益率达到10.6%、投资回收期为8.2 a。同时,研究并揭示了容量租赁比例、辅助服务价格、供热以及储能单位投资对共享储能电站技术经济性能的影响规律。最后,从技术及市场层面对热电联产型共享储能系统存在的等效储能容量、多重收益模式等关键问题进行了讨论。

关键词：共享储能热电联产新型能源系统综合能源商业模式

A new model for evaluating the electrical conductivity of nonferrous slag

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 500-504页

作者： Kuo-Chih chou School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Electrical conductivity of molten slag is an important physicochemical property for designing the refming process in electric smelting furnaces. Though conductivities of many slag systems have been measured, the quantitative relationships of conductivity with slag composition and temperature are still very limited. In this article, the Arrhenius law was used to describe the experimental data of conductivities for CaO-MgO-Al2O3-SiO2, CaO-Al2O3-SiO2, CaO-MnO-AlEO3-SiO2, as well as CaO-MgO-MnO- Al2O3-SiO： systems, and it is found that activation energy can be expressed as a linear function of the content of components, where the optical basicity of slag must be within the range of 0.58 to 0.68.

关键词： electrical conductivity Arrhenius law activation energy optical basicity

在线全文

学校读者我要写书评

暂无评论

乌药中3个新的倍半萜

天然产物研究与开发 2024年第4期36卷 555-561页

作者：李业生白旭岚许红涛侴桂新上海中医药大学中药研究所上海201203

研究乌药的化学成分。采用硅胶、ODS、Sephadex LH-20、制备液相等多种色谱分离技术进行分离纯化,通过波谱数据分析进行结构鉴定。从乌药90%乙醇提取物中分离得到4个倍半萜,分别鉴定为linderaggredin B1(1)、乌药酮酸A(2)、乌药酮酸B(3)... 详细信息

研究乌药的化学成分。采用硅胶、ODS、Sephadex LH-20、制备液相等多种色谱分离技术进行分离纯化,通过波谱数据分析进行结构鉴定。从乌药90%乙醇提取物中分离得到4个倍半萜,分别鉴定为linderaggredin B1(1)、乌药酮酸A(2)、乌药酮酸B(3)、chlorahupetolide K(4),其中化合物1~3为新化合物,化合物4为首次从樟科中分离得到。

关键词：乌药化学成分倍半萜桉叶烷型钓樟烷型

Path planning for mobile robot using self-adaptive learning particle swarm optimization

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第5期61卷 267-284页

作者： Guangsheng LI Wusheng chou School of Mechanical Engineering and Automation Beihang University State Key Laboratory of Virtual Reality Technology and Systems Beihang University

As a challenging optimization problem, path planning for mobile robot refers to searching an optimal or near-optimal path under different types of constrains in complex environments. In this paper, a self-adaptive learning particle swarm optimization(SLPSO) with different learning strategies is proposed to address this problem. First, we transform the path planning problem into a minimisation multi-objective optimization problem and formulate the objective function by considering three objectives: path length, collision risk degree and smoothness. Then, a novel self-adaptive learning mechanism is developed to adaptively select the most suitable search strategies at different stages of the optimization process, which can improve the search ability of particle swarm optimization(PSO). Moreover, in order to enhance the feasibility of the generated paths, we further apply the new bound violation handling schemes to restrict the velocity and position of each particle. Finally, experiments respectively with a simulated robot and a real robot are conducted and the results demonstrate the feasibility and effectiveness of SLPSO in solving mobile robot path planning problem.

关键词： path planning self-adaptive learning particle swarm optimization learning strategy learning mechanism boundary violations handling