检索结果-南通市图书馆

Short-TermWind Power Prediction Based on Combinatorial Neural Networks

在线全文

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第8期37卷 1437-1452页

作者： Tusongjiang Kari sun guoliang Lei Kesong Ma Xiaojing Wu Xian School of Electrical Engineering Xinjiang UniversityUrumqi830017China Anhui Nari Jiyuan Electric Power System Tech Co.LTD Hefei230088China

Wind power volatility not only limits the large-scale grid connection but also poses many challenges to safe grid *** wind power prediction can mitigate the adverse effects of wind power volatility on wind power grid *** the characteristics of wind power antecedent data and precedent data jointly to determine the prediction accuracy of the prediction model,the short-term prediction of wind power based on a combined neural network is ***,the Bi-directional Long Short Term Memory(BiLSTM)network prediction model is constructed,and the bi-directional nature of the BiLSTM network is used to deeply mine the wind power data information and find the correlation information within the ***,to avoid the limitation of a single prediction model when the wind power changes abruptly,the Wavelet Transform-Improved Adaptive Genetic Algorithm-Back Propagation(WT-IAGA-BP)neural network based on the combination of the WT-IAGA-BP neural network and BiLSTM network is constructed for the short-term prediction of wind ***,comparing with LSTM,BiLSTM,WT-LSTM,WT-BiLSTM,WT-IAGA-BP,and WT-IAGA-BP&LSTM prediction models,it is verified that the wind power short-term prediction model based on the combination of WT-IAGA-BP neural network and BiLSTM network has higher prediction accuracy.

关键词： Wind power prediction wavelet transform back propagation neural network bi-directional long short term memory

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

表面活性剂减阻技术综述及在暖通空调的应用

煤气与热力 2024年第2期44卷 26-31,42页

作者：孙国梁张浩玄克勇李炳炘山东建筑大学热能工程学院山东济南250101 山东省绿色建筑协同创新中心山东济南250101 山东林李建筑设计有限公司山东济南250014

对表面活性剂减阻机理、表面活性剂溶液流变特性、表面活性剂减阻效果的影响因素以及表面活性剂在暖通空调的应用进行分析。相对于高分子聚合物减阻,表面活性剂减阻在拥有良好减阻效果的同时,具备很好的抗剪切性能,既适用于循环式流体... 详细信息

对表面活性剂减阻机理、表面活性剂溶液流变特性、表面活性剂减阻效果的影响因素以及表面活性剂在暖通空调的应用进行分析。相对于高分子聚合物减阻,表面活性剂减阻在拥有良好减阻效果的同时,具备很好的抗剪切性能,既适用于循环式流体输送系统,又适用于非循环式流体输送系统。研究方向包括:表面活性剂减阻过程中的微观结构以及流变特性还需要进一步研究,以更好实现与其他减阻方法协同减阻。合理有效地运用、调节表面活性剂减阻效果影响因素,使减阻溶液持续高效发挥作用。开发适用于低温、高温工况的无腐蚀性的新型表面活性剂。表面活性剂在使用后的无害化处理。

关键词：表面活性剂减阻流变特性

Effect of Air Distribution on the Transport Characteristics of Solid Particles in the Thermal Storage and Release System of Circulating Fluidized Bed

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

Journal of Thermal Science 2024年第4期33卷 1554-1563页

作者： JI Zengcai SONG guoliang TANG Zihua sun Liwei State Key Laboratory of Coal Conversion Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

Solid particle heat storage technology offers a potential solution to the challenges posed by the significant growth of renewable energy sources,particularly in terms of grid security and ***,it has the capability to optimize the energy utilization efficiency of the power *** order to investigate the transport regulation characteristics of solid particles in the thermal storage and release system of a circulating fluidized bed(CFB),a test rig with a capacity of 0.1 MW(th)was *** rig was utilized to systematically study the transport regulation characteristics of solid particles under the double U-type valve feed structure and U-type valve discharge *** experimental findings indicate that the system's design enables efficient and rapid storage and release of solid particles in the *** air distribution mode,specifically the double U-type valve feed structure and the U-type valve discharge structure,significantly influence the feed and discharge characteristics of the ash storage *** was observed that the impact of loose air on these characteristics is more substantial than that of the return air,irrespective of the feed structure or the return *** adjusting the feed and discharge rate,it is recommended to adopt a scheme that involves coarse adjustment through loose air and fine adjustment through return air.

关键词： solid particle thermal storage air distribution mode transport regulation

Effect of structural characteristics on the transport characteristics of solid particles in the thermal storage and release system of circulating fluidized bed

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第6期89卷 22-31页

作者： Zengcai Ji guoliang Song Zihua Tang Liwei sun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

Coal-fired power generation stands as the most economically viable modulating power source in present-day *** holds the potential to offer prospective solutions to the challenges posed by the rapid expansion of intermittent,unpredictable,and unstable renewable energy *** particle thermal storage technology emerges as an effective means to enhance the flexibility of coal-fired circulating fluidized bed power *** attain an optimized structure for the solid particle thermal storage and release system in circulating fluidized bed units,experimental research was conducted on a 0.1 MWth circulating fluidized bed test *** study delved into the impact of ash storage bin geometries and the shapes of their feed-discharge valves on the control properties of solid particle *** experimental outcomes reveal that employing inverted m-shaped valve and dual U-shaped valves for feed control,alongside U-shaped valves and N-shaped valves for discharge control,both enable efficient and rapid storage and release of solid particles within the circulating fluidized *** similar air distribution conditions,the inverted m-shaped valve exhibits lower conveying energy consumption than the dual U-shaped valves,while the N-shaped valve excels in control characteristics over the U-shaped ***,the inverted m-shaped valve and the N-shaped valve demonstrate optimal overflow port heights,and the ash storage bin exhibits an optimum height-to-diameter ratio.

关键词： Solid particle Thermal storage System structure Transport regulation

经尿道前列腺钬激光剜除术治疗复发前列腺增生患者的临床分析

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

河北医学 2024年第5期30卷 829-834页

作者：许艳丽王健孙国良国素云河北省承德市中心医院河北承德067000 河北省承德市疾病预防控制中心/承德市卫生监督所河北承德067000

目的:研究经尿道前列腺钬激光剜除术治疗复发前列腺增生患者的临床效果。方法:收集承德市中心医院泌尿外科于2020年9月至2023年9月期间所收治的60例经尿道前列腺电切术(TURP)后再次出现中重度下尿路梗阻症状的患者为研究对象,并按随机... 详细信息

目的:研究经尿道前列腺钬激光剜除术治疗复发前列腺增生患者的临床效果。方法:收集承德市中心医院泌尿外科于2020年9月至2023年9月期间所收治的60例经尿道前列腺电切术(TURP)后再次出现中重度下尿路梗阻症状的患者为研究对象,并按随机数字表法,将其平分为两组:对照组与观察组,每组患者各30例。对照组行前列腺电切术,观察组行经尿道前列腺钬激光剜除术,对比两组临床疗效。结果:治疗前,两组患者前列腺功能、康复评分均无显著差异(P>0.05);治疗后,两组患者均有显著改善情况(P<0.05),且观察组显著优于对照组,差异有统计学意义(P<0.05)。观察组术后并发症发生率低于对照组(P<0.05);观察组手术时间、住院时间、出血量、膀胱冲洗时间等临床指标,均优于对照组(P<0.05)。结论:在复发前列腺增生的手术治疗中,经尿道前列腺钬激光剜除术不仅提升了手术治疗效果与安全性,还能降低术后并发症的发生率,值得临床推广。

关键词：经尿道前列腺钬激光剜除前列腺电切术复发前列腺增生

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

光伏运维操作平台的设计与应用

集成电路应用 2024年第6期41卷 87-89页

作者：魏显文孙国亮张世亮武威职业学院甘肃733000

阐述一种基于实战化技术培训的光伏运维员操作平台的设计,该操作平台通过在其支撑支架内部设置升降机构,实现高度调节功能。操作平台有延长机构、限位机构,满足光伏电站运维各类项目的实战化训练,也是相关课程实践教学设施设备的补充。

关键词：光伏系统升降机构高度调节限位机构

自尊与大学生锻炼动机的关系——心理资本和状态焦虑链式中介作用

在线全文

学校读者我要写书评

暂无评论

体育科技文献通报 2024年第7期32卷 233-237页

作者：丁雨晴石芳孙国良陈艺王积福长江大学教育与体育学院湖北荆州434023 浙江师范大学体育与健康科学学院浙江金华321004

目的:探讨自尊与大学生锻炼动机之间的关系,以及心理资本和状态焦虑在二者之间的中介作用。方法:采用文献资料法、问卷调查法、数理统计法等研究方法。结果:(1)自尊与大学生锻炼动机呈显著正相关(r=0.275,P<0.01),与心理资本呈显著正相... 详细信息

目的:探讨自尊与大学生锻炼动机之间的关系,以及心理资本和状态焦虑在二者之间的中介作用。方法:采用文献资料法、问卷调查法、数理统计法等研究方法。结果:(1)自尊与大学生锻炼动机呈显著正相关(r=0.275,P<0.01),与心理资本呈显著正相关(r=0.279,P<0.01),与状态焦虑呈显著负相关(r=-0.309,P<0.01);大学生锻炼动机与心理资本呈显著正相关(r=0.517,P<0.01),与状态焦虑呈显著负相关(r=-0.516,P<0.01),心理资本与状态焦虑显著负相关(r=-0.605,P<0.01)。(2)自尊对大学生锻炼动机的总效应为(β=0.275,P<0.001),直接效应为(β=0.096,P<0.01)。(3)自尊对大学生锻炼动机的中介效应主要通过3种途径实现,即“自尊→心理资本→大学生锻炼动机”“自尊→状态焦虑→大学生锻炼动机”“自尊→心理资本→状态焦虑→大学生锻炼动机”,这3种途径的效应量占整体的比例分别为31.48%、16.45%、17.03%。结论:(1)自尊对大学生锻炼动机有直接影响作用,自尊越强,大学生运动的内在动机和外在动机就越高;(2)自尊也可以通过心理资本和状态焦虑的中介作用影响大学生锻炼动机;(3)积极开展心理教育活动,提高大学生的自尊,增强大学生的心理资本,减少大学生的负向状态焦虑,有助于提高其大学生锻炼动机。

关键词：自尊大学生锻炼动机状态焦虑心理资本

基于小波变换与IAGA-BP神经网络的短期风电功率预测

在线全文

学校读者我要写书评

暂无评论

电测与仪表 2024年第5期61卷 126-134+145页

作者：孙国良伊力哈木·亚尔买买提张宽吐松江·卡日李振恩邸强新疆大学电气工程学院电力系统及大型发电设备安全控制和仿真国家重点实验室风光储分室

为提高风功率预测精度，减轻输出风能波动性对风电并网不利影响，提出了基于WT-IAGA-BP神经网络的短期风电功率预测方法。利用风速分区、3σ准则及拉格朗日插值法清洗风电场历史数据；其次，依据小波重构误差，选择db4小波分别提取风速... 详细信息

为提高风功率预测精度，减轻输出风能波动性对风电并网不利影响，提出了基于WT-IAGA-BP神经网络的短期风电功率预测方法。利用风速分区、3σ准则及拉格朗日插值法清洗风电场历史数据；其次，依据小波重构误差，选择db4小波分别提取风速、风向、历史风功率的不同频率特征信号，并引入改进自适应遗传算法(IAGA)对各序列BP神经网络的初始权值与阈值寻优，使用Sigmiod函数通过适应度值自适应改变交叉概率与变异概率；构建各序列的WT-IAGA-BP模型对短期风功率组合预测。通过仿真分析，并与ELM、IAGA-BP、WT-ELM及WT-LSSVM方法对比，验证该方法具有更高的预测精度和更好的预测性能。

关键词：风电功率预测数据清洗小波变换改进自适应遗传算法神经网络

The soft glumes of common wheat are sterile-lemmas as determined by the domestication gene Q

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2019年第1期7卷 113-117页

作者： Gaoyuan Song guoliang sun Xingchen Kong Meiling Jia Ke Wang Xingguo Ye Yun Zhou Shuaifeng Geng Long Mao Aili Li National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop Sciences Chinese Academy of Agricultural Sciences Collaborative Innovation Center of Crop Stress Biology Institute of Plant Stress Biology School of Life Science Henan University

The Q gene in common wheat encodes an APETALA2(AP2) transcription factor that causes the free threshing attribute. Wheat spikelets bearing several florets are subtended by a pair of soft glumes that allow free liberation of seeds. In wild species, the glumes are tough and rigid,making threshing difficult. However, the nature of these "soft glumes", caused by the domestication allele Q is not clear. Here, we found that over expression of Q in common wheat leads to homeotic florets at glume positions. We provide phenotypic, microscopy, and marker genes evidence to demonstrate that the soft glumes of common wheat are in fact lemma-like organs, or so-called sterile-lemmas. By comparing the structures subtending spikelets in wheat and other crops such as rice and maize, we found that AP2 genes may play conserved functions in grasses by manipulating vestigial structures, such as floret-derived soft glumes in wheat and empty glumes in rice. Conversion of these seemingly vegetative organs to reproductive organs may be useful in yield improvement of crop species.

关键词： Floret development Spike morphology Sterile lemma Wheat