检索结果-南通市图书馆

Effects of Probe Support on the Stall Characteristics of a Low-Speed Axial Compressor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2016年第1期25卷 43-49页

作者： Hongwei Ma shaohui Li Wei Wei National Key Laboratory of Science and Technology on aero-Engines Collaborative Innovation Center of Advanced Aero-EngineSchool of Energy&Power EngineeringBeihang UniversityBeijing100191 China Beijing Institute of Space Launch Technology Nanyuan Rd.Fengtai Dist.Beijing100076China China Academy of Aerospace Aerodynamics(CAAA) Yungangxi Rd.Fengtai Dist.Beijing100074China

In order to investigate the effects of probe support on the stall characteristics of micro compressors, an experiment was carried out on a large-scale low-speed research compressor according to the principle of geometric similarity. A cylindrical probe support intruding to 50% blade span was mounted at 50% chord upstream from the rotor blade leading edge. The static pressure rise characteristic of the compressor is measured, with and without the probe support respectively. The dynamic compressor behavior from pre-stall to full stall was also measured. The results indicate that the stability margin of the compressor is lowered after installing the probe support. The stall inception is aroused by modal wave disturbances. The disturbances developed into two stall cells smoothly before installing the probe support, while the disturbances first developed into a single stall cell then splitting into two stall cells after installing the probe support. The presence of probe support lowers the initial intensity of the rotating stall of the compressor, while it doesn't alter the intensity of the rotation stall after the compressor enters into full stall.

关键词： Probe support Compressor Stability Margin Stall inception Intensity/frequency of rotating stall

Comparative transcriptome study provides insights into acquisition of embryogenic ability in upland cotton during somatic embryogenesis

在线全文

学校读者我要写书评

暂无评论

Journal of Cotton Research 2018年第2期1卷 44-56页

作者： SUN Ruibin TIAN Ruiping MA Dan WANG shaohui LIU Chuanliang State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agriculture Sciences Zhengzhou Research Base State Key Laboratory of Cotton BiologyZhengzhou University

Background： The conversion from non-embryogenic callus （NEC） to embryogenic callus （EC） is the key bottleneck step in regeneration of upland cotton （Gossypium hirsutum）, and hinders the transgenic breeding of upland cotton. To investigate molecular mechanisms underlying acquisition of embryogenic potential during this process, comparation analysis of transcriptome dynamics between two upland cotton cultivars with different somatic embryogenesis abilities was conducted. Results： Differentially expressed genes involved in the transformation from NEC to EC were detected in the two different cultivars. Principal component analysis based on DEGs showed that the NEC tissues of the two cultivars were highly heterogeneous, whereas the derived EC tissues were similar, which suggested the homogeneousness of EC between different lines. In the highly embryogenic cultivar CCRI 24, more of these genes were down-regulated, whereas, in the recalcitrant cultivar CCRI 12, more were up-regulated. Bioinformatics analysis on these DEGs showed that the vast majority of differentially expressed genes were enriched in metabolism and secondary metabolites biosynthesis pathways. Flavonoid biosynthesis and phenylpropanoid biosynthesis pathways were enriched in both cultivars, and the associated genes were down-regulated more in CCRI 24 than in CCRI 12. We deduced that vigorous secondary metabolism in CCRI 12 may hinder primary metabolism, resulting in tardiness of cell differentiation. Interestingly, genes involved in the plant hormone signal transduction pathway were enriched in the recalcitrant cultivar CCRI 12, but not in CCRI 24, suggesting more radical regulation of hormone signal transduction in the recalcitrant cultivar. Signal transduction rather than biosynthesis of plant hormones is more likely to be the determining factor triggering NEC to EC transition in recalcitrant cotton lines. Transcription factor encoding genes showed differential regulation between two cultivars. Conclusion

关键词： Upland cotton Transcriptome Non-embryogenic callus (NEC) Embryogenic callus (EC) Somatic embryogenesis

Challenges and opportunities in 2D high-entropy alloy electrocatalysts for sustainable energy conversion

在线全文

学校读者我要写书评

暂无评论

SusMat 2023年第6期3卷 730-748页

作者： Die Lu Xinyao Fu Dong Guo Wei Ma shaohui Sun Gonglei Shao Zhen Zhou Interdisciplinary Research Centerfor Sustainable Energy Scienceand Engineering(IRC4SE^(2)) School of Chemical EngineeringZhengzhou UniversityZhengzhouChina

Two-dimensional(2D)high-entropy alloys(HEAs)have emerged as promising electrocatalysts due to the benefits of polymetallic coordination and robust elec-trical ***,the multiple elements in 2D HEAs pose challenges in achieving a uniform composition and maintaining a 2D limit morphology,complicating their structural ***,even minor adjust-ments to the composition can significantly alter the properties of 2D HEAs,underscoring the need for a deeper understanding of their structure-property relationships to advance synthesis and ***,this review crit-ically examines the intrinsic factors influencing synthesis methods and the practical applications of 2D HEAs in electrocatalysis for sustainable energy *** urgency is emphasized for developing new synthesis techniques,enhancing advanced characterization methods,and gaining profound insights into the functional mechanisms of 2D HEAs.

关键词： electrocatalysis high-entropy alloys structure-property relationships synthesis methods two-dimensional materials

A Stable Fuzzy-Based Computational Model and Control for Inductions Motors

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

Computer Modeling in Engineering & Sciences 2024年第1期138卷 793-812页

作者： Yongqiu Liu shaohui Zhong Nasreen Kausar Chunwei Zhang Ardashir Mohammadzadeh Dragan Pamucar School of Mechanical and Electrical Engineering Guangdong University of Science&TechnologyDongguan523083China School of Information Hunan Open UniversityChangsha410081China Department of Mathematics Faculty of Arts and SciencesYildiz Technical UniversityEsenlerIstanbul34220Turkey Multidisciplinary Center for Infrastructure Engineering Shenyang University of TechnologyShenyang110870China Faculty of Organizational Sciences University of BelgradeBelgrade11000Serbia College of Engineering Yuan Ze UniversityTaoyuan320315TaiwanChina

In this paper,a stable and adaptive sliding mode control(SMC)method for induction motors is *** the parameters of this system has been one of the existing *** solve this challenge,a new self-tuning type-2 fuzzy neural network calculates and updates the control system parameters with a fast *** to the dynamic changes of the system,in addition to the parameters of the SMC,the parameters of the type-2 fuzzy neural network are also updated *** conditions for guaranteeing the convergence and stability of the control system are *** the simulation part,in order to test the proposed method,several uncertain models and load torque have been ***,the results have been compared to the SMC based on the type-1 fuzzy system,the traditional SMC,and the PI *** average RMSE in different scenarios,for type-2 fuzzy SMC,is 0.0311,for type-1 fuzzy SMC is 0.0497,for traditional SMC is 0.0778,and finally for PI controller is 0.0997.

关键词： Sliding mode control self-tuning type-2 fuzzy systems inductions motor parameters uncertainty

Face Recognition Based on Convolution Neural Network 36

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

Face Recognition Based on Convolution Neural Network

Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish

第36届中国控制会议

作者： Kewen Yan shaohui Huang Yaoxian Song Wei Liu Neng Fan School of Automation Hangzhou Dianzi University College of Control Science and Engineering Zhejiang University

ISBN: (纸本)9781538629185

In this paper,a face recognition method based on Convolution Neural Network（CNN） is *** network consists of three convolution layers,two pooling layers,two full-connected layers and one Softmax regression *** gradient descent algorithm is used to train the feature extractor and the classifier,which can extract the facial features and classify them *** Dropout method is used to solve the over-fitting *** Convolution Architecture For Feature Extraction framework（Caffe） is used during the training and testing *** face recognition rate of the ORL face database and AR face database based on this network is99.82%and 99.78%.

关键词： Face Recognition CNN Image Processing Caffe

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第1期31卷 129-132页

作者： Qian Fang Lei Yang Haiqing Xiong shaohui Han Yun Zhang Jingpei Wang Wenqiang Chen Xiangzhi Song College of Chemistry&Chemical Engineering Central South UniversityChangsha 410083China Shandong Province Key Laboratory of Detection Technology for Tumor Makers School of Chemistry and Chemical EngineeringLinyi UniversityLinyi 276005China College of Chemistry and Materials Science Nanning Normal UniversityNanning 530001China Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Changsha 410083China

A coumarinocoumarin-based fluorescent probe,JCCA,was developed for the detection of N2 *** exhibited a fast turn-on fluorescence enhancement in response to N2 H4 with good selectivity,sensitivity and a detection limit... 详细信息

关键词： Fluorescent probe Hydrazine Selectivity Instantaneous Organism

Lignite-Based Hierarchical Porous C/SiO_(x)Composites as High-Performance Anode for Potassium-Ion Batteries

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第4期7卷 107-117页

作者： Zexu Yang Shouwang Zhao Rongji Jiao Gengyu Hao Yunying Liu Wenxiu He Jingwei Chen Guixiao Jia Jinlong Cui shaohui Li School of Chemistry and Chemical Engineering Aerogel Functional Nanomaterials LaboratoryInner Mongolia University of Science&TechnologyBaotou 014010China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Silicon oxide(SiO_(x),0 详细信息

Silicon oxide(SiO_(x),0tanding rate capability and *** expected,the obtained C/SiO_(x)composite delivers a superb specific capacity of 370 mAh g^(-1)at 0.1 A g^(-1)after 100 cycles as well as a highly reversible capacity of 208 mAh g^(-1)after 1200 cycles at 1.0 A g^(-1).Moreover,the potassium ion storage mechanism of C/SiO_(x)electrodes was investigated by ex-situ X-ray diffraction and transmission electron microscopy,revealing the formation of reversible products of K_(6.8)Si_(45.3)and K_(4)SiO_(4),accompanied by generation of irreversible K2O after the first *** work sheds light on designing low-cost Si-based anode materials for high-performance potassium-ion batteries and beyond.

关键词： anode hierarchical porous C/SiO_(x) K_(4)SiO_(4) lignite potassium-ion batteries

在线全文

学校读者我要写书评

暂无评论

口径近场的特征谱

航空学报 2008年第1期29卷 136-140页

作者：全绍辉北京航空航天大学电子信息工程学院北京100083

提出口径近场特征谱的概念,以描述口径设计近场特征。特征谱包括角域谱和时域谱,分别定义为口径近场区空域场和频域场在角域和时域的变换。理论分析和计算结果表明,特征谱可以在角域和时域上分离有限大口径的直达波和绕射波,因而可以用... 详细信息

提出口径近场特征谱的概念,以描述口径设计近场特征。特征谱包括角域谱和时域谱,分别定义为口径近场区空域场和频域场在角域和时域的变换。理论分析和计算结果表明,特征谱可以在角域和时域上分离有限大口径的直达波和绕射波,因而可以用来描述口面尺寸、形状和场分布等条件改变时绕射场的相对变化,这对紧缩场设计具有参考价值。基于口面场卷积法,计算、比较了限度为5m×5m圆口径和方口径近场在X波段特征谱分布。并导出:口径近场角谱为口径场角谱和网络响应函数角谱的乘积,网络响应函数等效于一个空间角谱滤波器。

关键词：特征谱口径场近场卷积法紧缩场

Micropore engineering on hollow nanospheres for ultra-stable sodium-selenium batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 99-109,I0004页

作者： Gongke Wang Yumeng Chen Yu Han Lixue Yang Wenqing Zhao Changrui Chen Zihao Zeng Shuya Lei shaohui Yuan Peng Ge School of Materials Science and Engineering Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage MaterialsHenan Normal UniversityXinxiang 453007HenanChina Comprehensive Energy Research Center Institute of Science and TechnologyChina Three Gorges CorporationBeijing 100038China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Attracted by high energy density and considerable conductivity of selenium(Se),Na-Se batteries have been deemed promising energy-storage ***,it still suffers from sluggish kinetic behaviors and similar“shuttling effect”to ***,utilizing uniform hollow carbon spheres as precursors,Se-material is effectively loaded through vapor-infiltration *** to the distribution of optimized pores,the content of microspores could be up to~60%(tant roles for the physical confinement ***,the rich oxygen-containing groups and N-elements could be noted,inducing the evolution of electron-moving *** significantly,assisted by the interfacial C-Se bonds and tiny Se distributions,Se electrodes are activated during *** as cathodes for Na-Se systems,the as-resulted samples display a capacity of 593.9 mA h g^(-1)after 100 cycles at the current density of 0.1 *** after 6000 cycles,the capacity could be still kept at about 225 mA h g^(-1)at 5.0 *** by the detailed kinetic analysis,the designed microspores size induces the increasing redox reaction of nano Se,whilst the surface traits further render the enhancement of pseudo-capacitive ***,after cycling,the product Sex(x<4)in pores serves as the primary active *** this,the work is anticipated to provide an effective strategy for advanced electrodes for Na-Se systems.

关键词： Carbon host Tailoring pores Heteroatom doping Vapor-infltration method Sodium-selenium batteries