检索结果-南通市图书馆

IET Cyber-Systems and Robotics 2021年第3期3卷 265-277页

作者： Wei Zhang Hanyong Wang yemin lin Jianle Jin Wenjuan Liu Xiaolan An Jinshuitan Hydropower Plant of State Grid Zhejiang Electric Power Co.Ltd LishuiChina Institute of Cyber-Systems and Control College of Control Science and EngineeringZhejiang UniversityHangzhouChina

Flood prevention and disaster mitigation have a great impact on people's lives and properties,and so it is urgent to realise high-accuracy inflow predictions for flood early warning.To this end,a prediction model based on a machine learning algorithm via a multimodel combination method is proposed to predict the inflow of Jinshuitan reservoir.Firstly,a data formatting scheme called the‘hydrological regime profile’is designed for input data.The whole data set is partitioned into a low-flow subset and a high-flow subset.Considering the high dimensions of the complex input data,convolutional neural networks(CNN),EXtreme gradient Boosting model(XGBoost)and a partial least squares model(PLS)are used.In the CNN and XGBoost models,a special loss function weighted on inflow is designed to improve the performance on high-inflow predictions.Finally,a multi-model combination method is proposed to improve the prediction performance.Compared with XGBoost,CNN and PLS,the root mean square error of the combined model is reduced by 41.64%,72.29%and 3.41%,respectively.As a consequence,the combined model is able to predict the inflows with higher accuracy compared to the single models.

关键词： prediction algorithm disaster

Transformer在水电机组异常指标预测的应用

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

浙江电力 2023年第1期42卷 110-116页

作者：林烨敏王宁邱荣杰汤宇超周冠群李泽洲王中亚国网浙江省电力有限公司紧水滩水力发电厂浙江丽水323000 宁波工业互联网研究院浙江宁波315016

水电站机组日常检修、维护及异常检测的工作量巨大,传统人工监测的工作方式容易导致异常问题被遗漏或误判,采用深度学习算法对数据建模并监测异常情况可以降低成本,提升安全可靠性。结合Transformer网络对长期序列高效准确建模的能力以... 详细信息

水电站机组日常检修、维护及异常检测的工作量巨大,传统人工监测的工作方式容易导致异常问题被遗漏或误判,采用深度学习算法对数据建模并监测异常情况可以降低成本,提升安全可靠性。结合Transformer网络对长期序列高效准确建模的能力以及GAN(生成对抗网络)架构的数据生成训练策略,利用TransGAN模型对水电机组监测数据进行生成式建模,并主动发现异常数据点。TransGAN模型在水电站机组实测中达到了97.76%的查准率和99.23%的查全率,异常点检出延迟低于0.1 s,实现了实时高精度异常监控功能。

关键词：水电机组异常监测数据降维 Transformer 生成对抗网络

在线全文

学校读者我要写书评

暂无评论

热管空调系统在高发热密度数据机房的应用

制冷 2021年第3期40卷 54-57页

作者：何智光李震施峻林烨敏项敏清华大学航天航空学院北京100084 河北清华发展研究院廊坊065000 国网浙江省电力有限公司紧水滩水力发电厂丽水323000

数据机房作为信息行业发展的重要支撑,近年来,随着信息技术的飞速发展,数据机房在规模和数量上也不断增加。随着数据机房发热密度的逐渐提高,对数据机房排热的要求也越来越高。传统集中式送风冷却系统由于存在气流掺混和受风机能耗的限... 详细信息

数据机房作为信息行业发展的重要支撑,近年来,随着信息技术的飞速发展,数据机房在规模和数量上也不断增加。随着数据机房发热密度的逐渐提高,对数据机房排热的要求也越来越高。传统集中式送风冷却系统由于存在气流掺混和受风机能耗的限制,已经难以满足高发热密度机房的散热需求;本文对热管空调系统进行了介绍和分析,阐明了其在高发热密度机房的适用性和节能性。并对北京某机房进行了实际改造测试,测试结果表明,热管空调系统能够在保证机房散热要求的前提下达到约20%的全年节电率。

关键词：热管空调数据机房高发热密度节能

A 400MHz Single-Chip CMOS Transceiver for Long Range High Definition Video Transmission in UAV Application

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第3期29卷 554-562页

作者： HUANG Shuigen lin Min WANG Ruoyu CHEN Zhuojun DONG yemin Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai University

A fully-integrated 400MHz transceiver for high definition video transmission in Unmanned aerial vehicle（UAV） is presented. The transceiver integrates a Receiver（RX）, a Transmitter（TX）, a tunable multi-mode complex filter, two sigma-delta fractional-N PLL frequency synthesizers and some baseband calibration circuits, which is applicable for both Time division duplex（TDD） and Frequency division duplex（FDD） systems. In order to meet different data rate and sensitivity requirements for control signal and video signal transmission, the transceiver supports BPSK/QPSK/QAM modulation.The receiver sensitivity is –75dBm and the transmitter provides emission power up to 12dBm. Besides, the Error vector magnitude（EVM） of –35dB is measured under 64QAM modulation with 54Mbps data rate.Fabricated in a standard 130nm CMOS process and operated at 1.2V supply for most circuits excluding PA,3.3V supply for PA, the receiver and the transmitter consume 68.2mW and 164.3mW, including the frequency synthesizer, respectively. The total chip area with pads is 6.25 mm;.

关键词： CMOS Transceiver Unmanned aerial vehicle(UAV) Wireless video transmission

The chain-shaped coordination polymers based on the bowl-like Ln_(18)_(Ni24(23.5))clusters exhibiting favorable low-field magnetocaloric effect

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第12期32卷 3803-3806页

作者： Ningfang Li Qingfang lin yemin Han Zeyu Du Yan Xu College of Chemical Engineering State Key Laboratory of Materials-Oriented Chemical EngineeringNanjing Tech UniversityNanjing 210093China Department of Chemistry Bengbu Medical CollegeBengbu 233030China

The design of assembling high-nuclearity transition-lanthanide(3d-4f) clusters along with excellent magnetocaloric effect(MCE) is one of the most prominent fields but is extremely challenging. Herein, two heterometallic metal coordination polymers are constructed via the “carbonatetemplate” method, formulated as {[Gd_(18)Ni_(24)(IDA)_(22)(CO_(3))_(7)(μ_(3)-OH)_(32)(μ_(2)-OH)_(3)(H_(2)O)_(5)Cl]·Cl_(8)·(H_(2)O)_(14)}nand{[Eu_(18)Ni_(23.5)(IDA)_(22)(CO_(3)_(7)(μ_(3)-OH)_(32)(H_(2)O)_(5)(IN)(CH_(3)COO)_(2)(NH_(2)CH_(2)COO)Cl]·C_(l6)·(H_(2)O)_(17)}n[abbreviated as 1-(Gd_(18)Ni_(24))nand 2-(Eu_(18)Ni_(23.5))n respectively;H_(2)IDA = iminodiacetic acid;HIN = isonicotinic acid]. Concerning the structures, compounds 1-(Gd_(18)Ni_(24))nand 2-(Eu_(18)Ni_(23.5))nboth feature the one-dimensional(1D) chain-like structure which is rarely reported in high-nuclearity metal complexes. Meanwhile, the large presences of Gd3+ ions in compound 1-(Gd18Ni24)nare conducive to the fantastic MCE, and the value of-ΔS_(m)is 35.30 J kg^(-1)K^(-1) at 3.0 K and ΔH = 7.0 T. And more significantly, compound 1-Gd_(18)Ni_(24)n shows the large low-field magnetic entropy change(-ΔS_(m)= 20.95 J kg(-1) K(-1) at 2.0 K and ΔH = 2.0 T)among the published 3 d-4 f mixed metal clusters.

关键词： 3d-4f Anionic templets Chain-like structure High-nuclearity clusters Magnetic refrigeration Mixed-ligand method

Characterization of the tunicamycin gene cluster unveiling unique steps involved in its biosynthesis

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2010年第12期1卷 1093-1105页

作者： Wenqing Chen Dongjing Qu Lipeng Zhai Meifeng Tao yemin Wang Shuangjun lin Neil P.J.Price Zixin Deng Laboratory of Microbial Metabolism and School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai 200030China National Center for Agricultural Utilization Research(NCAUR) USDA-ARS1815 North University StreetPeoriaIllinois 61604USA College of Pharmacy Wuhan UniversityWuhan 430072China

Tunicamycin,a potent reversible translocase I inhibitor,is produced by several Actinomycetes species.The tunicamycin structure is highly unusual,and contains an 11-carbon dialdose sugar and anα,β-1″,11′-glycosidic linkage.Here we report the identification of a gene cluster essential for tunicamycin biosynthesis by high-throughput heterologous expression(HHE)strategy combined with a bioassay.Introduction of the genes into heterologous non-producing Streptomyces hosts results in production of tunicamycin by these strains,demonstrating the role of the genes for the biosynthesis of tunicamycins.Gene disruption experiments coupled with bioinformatic analysis revealed that the tunicamycin gene cluster is minimally composed of 12 genes(tunA–tunL).Amongst these is a putative radical SAM enzyme(Tun B)with a potentially unique role in biosynthetic carbon-carbon bond formation.Hence,a seven-step novel pathway is proposed for tunicamycin biosynthesis.Moreover,two gene clusters for the potential biosynthesis of tunicamycin-like antibiotics were also identified in Streptomyces clavuligerus ATCC 27064 and Actinosynnema mirums DSM 43827.These data provide clarification of the novel mechanisms for tunicamycin biosynthesis,and for the generation of new-designer tunicamycin analogs with selective/enhanced bioactivity via combinatorial biosynthesis strategies.

关键词： tunicamycin biosynthetic gene cluster high-throughput heterologous expression bioassay combinatorial biosynthesis

从“痞坚之处,必有伏阳”议保和丸用连翘之旨

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

中华中医药杂志 2023年第12期38卷 6083-6085页

作者：王也民杨新栎沈其霖金钊成都中医药大学成都611137 河北中医药大学石家庄050091

保和丸是治食积的代表方,其所治之“食积”通常被解读为伤食证,然而保和丸并非为伤食证之食积而立,此方最早出自《丹溪心法》“积聚痞块”门类,故其所治“食积”是因饮食内伤造成了食郁,并且迁延日久所生的积聚痞块。文章通过对比朱丹... 详细信息

保和丸是治食积的代表方,其所治之“食积”通常被解读为伤食证,然而保和丸并非为伤食证之食积而立,此方最早出自《丹溪心法》“积聚痞块”门类,故其所治“食积”是因饮食内伤造成了食郁,并且迁延日久所生的积聚痞块。文章通过对比朱丹溪治伤食证之常法以及保和丸与越鞠法的联系,得出方中连翘非为消食所设,而是由于积聚痞块可使局部气血郁而化热,故用连翘清热散结,即清其伏火,散其痞坚。正所谓“痞坚之处,必有伏阳”的道理。

关键词：保和丸连翘清热散结积聚痞块郁

基于谐波状态空间理论的LCL型并网逆变器谐波交互及稳定性分析

在线全文

学校读者我要写书评

暂无评论

电力自动化设备 2022年第6期42卷 76-83页

作者：林顺富戴烨敏颜昕昱李东东符杨上海电力大学电气工程学院上海200090 国网上海市电力公司市北供电公司上海200070

电网的逐渐电力电子化引发了谐波谐振、系统不稳定。为获得系统详细的谐波交互情况和不稳定模式,针对三相LCL型并网逆变器,首先基于谐波状态空间(HSS)理论建立其双电流环控制下的数学模型;其次深入研究公共连接点处电网背景谐波电压对... 详细信息

电网的逐渐电力电子化引发了谐波谐振、系统不稳定。为获得系统详细的谐波交互情况和不稳定模式,针对三相LCL型并网逆变器,首先基于谐波状态空间(HSS)理论建立其双电流环控制下的数学模型;其次深入研究公共连接点处电网背景谐波电压对逆变器直流侧电压和交流侧电流的影响,以及直流侧电压扰动对交流侧的影响;同时推导出谐波交互的耦合系数矩阵,并分析耦合特性;然后在HSS数学模型的基础上,利用阻抗分析法揭示了弱电网情况下逆变器谐波振荡产生的机理;最后将实验、仿真模型结果与数学模型结果进行了对比,验证了数学模型的有效性以及理论分析结果的正确性。

关键词：谐波状态空间并网逆变器谐波交互弱电网电网阻抗稳定性分析

考虑谐波耦合的多变流器并网系统建模及交直流谐波交互特性分析

在线全文

学校读者我要写书评

暂无评论

电力系统保护与控制 2023年第10期51卷 65-77页

作者：林顺富李寅戴烨敏杨帆边晓燕李东东上海电力大学电气工程学院上海200090 国网上海市电力公司青浦供电公司上海201799

新型电力系统中高比例可再生能源和高比例电力电子设备接入的特征带来异于传统电网下的谐波交互问题,多变流器拓扑的谐波耦合交互特性亟待研究。首先,基于谐波状态空间(harmonic state space,HSS)对多变流器并网系统(multiple grid-conn... 详细信息

新型电力系统中高比例可再生能源和高比例电力电子设备接入的特征带来异于传统电网下的谐波交互问题,多变流器拓扑的谐波耦合交互特性亟待研究。首先,基于谐波状态空间(harmonic state space,HSS)对多变流器并网系统(multiple grid-connected-converter system,MGCCS)建立考虑谐波耦合的谐波传递函数矩阵模型,综合考虑了系统各控制环节对状态变量的影响以及变流器的级联、并联。其次,基于所建HSS模型明确定义谐波耦合系数,并用于揭示多变流器拓扑的谐波耦合机理,分析级联、并联变流器谐波交互特性。然后,应用谐波耦合系数量化分析MGCCS中滤波电感、电流环、锁相环等关键参数对系统谐波交互的影响。最后,将HSS模型和Matlab/Simulink模型、RT-LAB模型的结果进行对比,验证了所建HSS模型的精确性,以及谐波耦合系数理论应用于系统交直流谐波交互分析的有效性。

关键词：多变流器并网系统交直流谐波交互谐波状态空间谐波耦合系数并网电流

0.13μm标准CMOS工艺的高可靠流水线模数转换器

在线全文

学校读者我要写书评

暂无评论

国防科技大学学报 2018年第6期40卷 165-170页

作者：周宗坤黄水根董业民林敏中国科学院上海微系统与信息技术研究所上海200050 中国科学院大学北京100049

针对航空航天电子系统对高性能模数转换器的需求,采用0. 13μm标准互补金属氧化物半导体工艺,设计可以在极端温度和空间辐射环境中稳定可靠工作的12位分辨率、50 MS/s采样率的流水线模数转换器。通过采用无采样保持电路以及抗辐射电路... 详细信息

针对航空航天电子系统对高性能模数转换器的需求,采用0. 13μm标准互补金属氧化物半导体工艺,设计可以在极端温度和空间辐射环境中稳定可靠工作的12位分辨率、50 MS/s采样率的流水线模数转换器。通过采用无采样保持电路以及抗辐射电路和版图加固等技术,在减小功耗的同时有效地削弱总剂量辐射效应的影响。测试结果表明:在-55～125℃温度范围内以及150 krad(Si)的总剂量辐照条件下,得到大于64 dB的信噪比、大于73. 5 dB的无杂散动态范围和最大0. 22 dB的微分非线性。

关键词：流水线模数转换器无采样保持电路总剂量辐射效应版图加固技术