检索结果-南通市图书馆

Impacts of solar multiple on the performance of direct steam generation solar power tower plant with integrated thermal storage

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2017年第4期11卷 461-471页

作者： Yah LUO Xiaoze DU lijun yang Chao XU Muhammad AMJAD School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 School of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing 100029 China School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China School of Chemical and Process Engineering University of Leeds Leeds LS2 9JT UK School of Energy Power and MechanicalEngineering North China Electric Power University Beijing 102206China

Solar multiple （SM） and thermal storage capacity are two key design parameters for revealing the performance of direct steam generation （DSG） solar power tower plant. In the case of settled land area, SM and thermal storage capacity can be optimized to obtain the minimum levelized cost of electricity （LCOE） by adjusting the power generation output. Taking the dual-receiver DSG solar power tower plant with a given size of solar field equivalent electricity of 100 MWe in Sevilla as a reference case, the minimum LCOE is 21.77 /kWhe with an SM of 1.7 and a thermal storage capacity of 3 h. Besides Sevilla, two other sites are also introduced to discuss the influence of annual DNI. When compared with the case of Sevilla, the minimum LCOE and optimal SM of the San Jose site change just slightly, while the minimum LCOE of the Bishop site decreases by 32.8% and the optimal SM is reduced to 1.3. The influence of the size of solar field equivalent electricity is studied as well. The minimum LCOE decreases with the size of solar field, while the optimal SM and thermal storage capacity still remain unchanged. In addition, the sensitivity of different investment in sub-system is investigated. In terms ofoptimal SM and thermal storage capacity, they can decrease with the cost of thermal storage system but increase with the cost of power generation unit.

关键词： direct steam generation solar power tower,solar multiple thermal energy storage capacity levelizedcost of electricity (LCOE)

电站直接空冷系统运行状态数字化实时显示技术

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

热力发电 2024年第6期53卷 142-150页

作者：黎景越张铎翟金星倪傲旋陈磊杨立军通辽霍林河坑口发电有限责任公司内蒙古霍林郭勒029200 华北电力大学能源动力与机械工程学院北京102206

随着人工智能、数字孪生技术及数字化虚拟技术的快速发展,采用数字化虚拟技术实现电站直接空冷机组空冷岛运行状态的实时监测成为可能。首先,建立空冷岛三维模型,通过数值计算获得空冷岛空气状态参数,开发空冷岛运行状态数据库及显示和... 详细信息

随着人工智能、数字孪生技术及数字化虚拟技术的快速发展,采用数字化虚拟技术实现电站直接空冷机组空冷岛运行状态的实时监测成为可能。首先,建立空冷岛三维模型,通过数值计算获得空冷岛空气状态参数,开发空冷岛运行状态数据库及显示和查询软件;其次,基于数字孪生技术,在电厂设置气象站,获得环境气温、风速、风向实时变化数据,连同机组运行工况参数输入监测软件;最终,计算获得空冷岛空气运行状态并进行三维显示。基于数字孪生技术的空冷系统空气运行状态实时显示技术避免了现场大量装设测点的投资和检修维护工作,为智慧电站的发展奠定了基础。

关键词：直接空冷系统数字孪生运行状态可视化

维普期刊数据库博看期刊

Influence of Vegetable Oil on the Thermal Aging Rate of Kraft Paper and its Mechanism

在线全文

学校读者我要写书评

暂无评论

高电压技术 2012年第8期38卷 2059-2067页

作者： yang lijun DENG Bangfei LIAO Ruijin SUN Caixin ZHU Mengzhao the State Key Laboratory of Transmission&Distribution Equipments and Power System Safety and New Technology Chongqing University Chongqing 400030 China~ Chongqing Electric Power Test&Research Chongqing 400015 China

With the development of new insulation materials,vegetable oil-the best substitute for mineral oil-has gradually been widely used in the liquid insulation of *** investigate the influence of vegetable oil on the thermal aging rate of oil paper,Kraft paper impregnated with mineral oil and vegetable oil have been underwent thermally accelerated aging at three different *** degree of polymerization(DP) of Kraft paper was measured to indicate the aging degree of insulation *** aging rate of Kraft paper in mineral oil and vegetable oil was compared quantitatively,and results showed that vegetable oil retarded paper’s degradation rate and extended its useful *** reasons contributing to such phenomena were analyzed using X-ray Photoelectron Spectroscopy(XPS) and molecular simulation *** paper in vegetable oil had larger activation *** to the larger interaction force between water and natural ester molecules,water molecules were easily bonded with natural ester,weakening the hydrolysis process of *** was chemically modified by natural ester during the thermal aging process,and the reactive-OH(hydroxyl) groups on the cellulose became esterified with fatty acid *** molecules were firmly bounded to the ester groups on glucose produced by *** long-chain fatty acid esterified to cellulose was parallel with cellulose chains and acted as a "water barrier" to further weaken the hydrolysis process.

关键词：局部放电射频信号放电量高电压技术

维生素A、D、E水平与妊娠期高血压疾病病情及预后的相关性

在线全文

学校读者我要写书评

暂无评论

中国实用医刊 2024年第13期51卷 28-31页

作者：杨丽君杨志华王利敏安阳市妇幼保健院妇产科安阳455000

目的:分析维生素A、D、E水平与妊娠期高血压疾病(HDCP)病情及预后的相关性。方法:回顾性抽取2018年6月至2019年2月安阳市妇幼保健院收治的HDCP孕妇198例为HDCP组,按照病情程度将其再分为妊娠期高血压组(51例)、子痫前期组(65例)、重度... 详细信息

目的:分析维生素A、D、E水平与妊娠期高血压疾病(HDCP)病情及预后的相关性。方法:回顾性抽取2018年6月至2019年2月安阳市妇幼保健院收治的HDCP孕妇198例为HDCP组,按照病情程度将其再分为妊娠期高血压组(51例)、子痫前期组(65例)、重度子痫前期组(82例),并以1∶1配比抽取同期健康体检孕妇198例为健康组。检测所有孕妇维生素A、D、E水平,比较检测结果,统计不同病情程度和不同预后HDCP患者维生素A、D、E水平,分析维生素A、D、E水平与HDCP病情及预后的相关性。结果:HDCP组维生素A、D、E水平低于健康组(P<0.05)。子痫前期组和重度子痫前期组维生素A、D、E水平低于妊娠期高血压组(P<0.05),重度子痫前期组维生素A、D、E水平低于子痫前期组(P<0.05)。预后不良HDCP孕妇维生素A、D、E水平低于预后良好HDCP孕妇(P<0.05)。Pearson结果显示,维生素A、D、E水平与HDCP病情及预后呈负相关(r=-0.48、-0.63、-0.57、-0.47、-0.62、-0.60,P均<0.05)。结论:HDCP孕妇维生素A、D、E水平明显降低,且维生素A、D、E水平与HDCP病情及预后存在相关性,病情越严重和预后越差其维生素A、D、E水平越低。

关键词：维生素A 维生素D 维生素E 妊娠期高血压疾病预后

Assessing Strategy of Power Transformers Insulation State Based on Part-division and Entropy Method

在线全文

学校读者我要写书评

暂无评论

高电压技术 2013年第8期39卷 1830-1836页

作者： LIAO Ruijin LIU Bin ZHANG Yiyi yang lijun ZHENG Hanbo (State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400030 China)

Failure mechanisms of power transformers are complex and uncertain; it is difficult to determine index weights of insulation state. Therefore, it is a challenge to acquire an accurate assessment of insulation state of power transformers. In this paper, an assessing strategy for transformer insulation is proposed base on part-division of transformer and a comprehensive weight determination method. An index system of transformer is established on the basis of part-division of transformer. Each index’s weight is consisted of two parts, the constant weight and the variable weight, which are determined by improved analytic hierarchy process (AHP) and entropy method respectively. Af- ter categorizing insulation state into four levels and standardizing assessing indexes, a Cauchy membership function is forged, and a fuzzy algorithm is employed to simulate the uncertainty of the insulation state. Finally, a confidence criterion is employed to perform part-division based condition assessment of transformer. Case studies reveal that the proposed assessing strategy method is effective, convenient, and practical; with the new strategy, potential failures of transformers can be forecasted and insulation state of transformer parts can also be as- sessed. Furthermore, the assessing results can be used to guide condition-based maintenance.

关键词：电力变压器绝缘状态评估策略熵值法国家战略分划改进层次分析法指标权重

在线全文

学校读者我要写书评

暂无评论

BZ振荡反应实验的课程思政设计

大学化学 2024年第2期39卷 72-76页

作者：淳远杨立军杨金月高卫南京大学化学化工学院化学国家级实验教学示范中心南京210023

传统BZ振荡反应实验着重于耗散结构知识的传授和诱导期反应活化能的测量。本案例基于同心圆生长过程呈现的丰富多彩的现象和蕴含的人生哲理,以耗散结构理论为支撑,对实验内容进行了创新设计,引入同心圆实验内容和翻转学习模式,在提升学... 详细信息

传统BZ振荡反应实验着重于耗散结构知识的传授和诱导期反应活化能的测量。本案例基于同心圆生长过程呈现的丰富多彩的现象和蕴含的人生哲理,以耗散结构理论为支撑,对实验内容进行了创新设计,引入同心圆实验内容和翻转学习模式,在提升学生科学素养和研究能力的同时,引导学生分析实验中存在的安全隐患和对环境可能造成的影响,在实验过程中融入对人生的思考,在课后利用耗散结构相关原理去认识世界和改造世界。改进后实验将有助于树立学生正确的人生观和世界观。

关键词：物理化学实验 BZ振荡反应同心圆课程思政实验设计

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

焊接机器人在钢结构制造中的研究与应用

自动化应用 2024年第11期65卷 42-46,51页

作者：闫玉龙杨立军冯嘉中海石油(中国)有限公司天津分公司天津300459 中海油能源发展装备技术有限公司天津300457

传统人工焊接存在自动化程度低、效率低下、质量参差不一等问题,而焊接机器人能大幅提高焊接效率,节省人力及改善焊接质量,保障同类焊缝的一致性,可被大规模应用于钢结构生产制造,因此,制造行业正逐渐向无人化、智能化方向转型。以油类... 详细信息

传统人工焊接存在自动化程度低、效率低下、质量参差不一等问题,而焊接机器人能大幅提高焊接效率,节省人力及改善焊接质量,保障同类焊缝的一致性,可被大规模应用于钢结构生产制造,因此,制造行业正逐渐向无人化、智能化方向转型。以油类垃圾箱为研究对象,采用Solidworks构建三维模型并进行静力学校核计算,利用Robot Stutio建立焊接工作站模拟仿真,对焊接轨迹进行离线编程,采用龙门式焊接机器人进行现场示教,调试激光纠偏系统,完成对油类垃圾箱的单片焊接,为焊接机器人在钢结构行业提供了应用依据。最后探讨了先进焊缝追踪技术和智能化焊接机器人,明确了焊接机器人未来应用的方向和趋势。

关键词：焊接机器人焊缝追踪技术三维建模离线编程钢结构

儿童晚期心力衰竭植入式左心室辅助装置手术技术

在线全文

学校读者我要写书评

暂无评论

中华小儿外科杂志 2024年第8期45卷 686-690页

作者：范祥明应力阳刘喜旺高强林茹杨丽君舒强国家儿童健康与疾病临床医学研究中心浙江大学医学院附属儿童医院心脏外科杭州310057 国家儿童健康与疾病临床医学研究中心浙江大学医学院附属儿童医院心衰/机械辅助循环科杭州310057

目的总结儿童植入式左心室辅助装置(left ventricular assist device,LVAD)的手术技术经验及效果。方法回顾分析2023年2月至2024年2月浙江大学医学院附属儿童医院收治的3例晚期心力衰竭患儿临床资料,其中男1例,女2例,年龄范围在12~14岁... 详细信息

目的总结儿童植入式左心室辅助装置(left ventricular assist device,LVAD)的手术技术经验及效果。方法回顾分析2023年2月至2024年2月浙江大学医学院附属儿童医院收治的3例晚期心力衰竭患儿临床资料,其中男1例,女2例,年龄范围在12~14岁,体重30.0~38.0 kg。对LVAD植入手术的技术要点进行总结:连接LVAD泵,测试LVAD泵,制作线缆隧道,心内畸形修复,定位和缝合顶环,打孔刀取芯,泵头插入,人工血管吻合,启动血泵,血流动力学调整及止血关胸。结果3例患儿均在体外循环下顺利完成LVAD植入术+三尖瓣环缩术,术后第1天撤离呼吸机,直接口服华法林抗凝,术后7~9 d停用血管活性药物,并于术后30 d左右痊愈出院。出院随访LVAD运行良好,泵速分布为2400~2550转/min及流量为1.91~2.63 L/min,左右心功能匹配,室间隔居中略右。其中2例术后半年已重返校园,生活自理,1例在家休养。结论植入式LVAD是治疗儿童晚期心力衰竭安全有效的方法。不同于成人患者,在LVAD的选择及具体植入技术方面需要更多的考量。

关键词：心力衰竭心脏辅助装置心肌疾病左心室儿童

Characteristics of LDPE and Oriented Montmorillonite Nanocomposites Produced by Electric Field-inducement

在线全文

学校读者我要写书评

暂无评论

高电压技术 2013年第8期39卷 1947-1951页

作者： BAI Ge LIAO Ruijin yang lijun YUAN Yuan GU Jia State Key Laboratory of Transmission & Distribution Equipments and Power System Safety and New Technology Chongqing University Chongqing 400030 China

In order to make montmorillonite (MMT) nanosheets disperse in low-density polyethylene (LDPE) with highly homogeneous orientation, alternating voltage is applied to molten LDPE with MMT nanosheets. The effect of electric field on the dispersion of MMT in the solidified LDPE is studied. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses suggest that the MMT nano- sheets are aligned with high anisotropy to the electric field direction, which is perpendicular to the LDPE film plane. Differential scanning calorimetry (DSC) results reveal that the crystallization degree of the oriented LDPE/MMT composite increases. Moreover, through a broadband dielectric spectroscopy analyzer, it is found that MMT manifests a significantly influence in the dielectric property of the oriented composite: the dielectric constant and loss tangent of the composite both become larger. Analysis shows that the electric field-induced torque caused by the polarization of MMT flakes is the main force inducing the orientation of the MMT flakes.

关键词：纳米复合材料 LDPE薄膜电场方向介电特性蒙脱土低密度聚乙烯扫描电子显微镜差示扫描量热法