检索结果-南通市图书馆

Improvement for expansion of parabolized stability equation method in boundary layer stability analysis

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2018年第12期39卷 1737-1754页

作者： yufeng han Jianxin LIU Jisheng LUO Department of Mechanics Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Modern Engineering Mechanics Tianjin 300072China

An improved expansion of the parabolized stability equation(iEPSE) method is proposed for the accurate linear instability prediction in boundary layers. It is a local eigenvalue problem, and the streamwise wavenumber α and its streamwise gradient dα/dx are unknown variables. This eigenvalue problem is solved for the eigenvalue dα/dx with an initial α, and the correction of α is performed with the conservation relation used in the PSE. The i EPSE is validated in several compressible and incompressible boundary layers. The computational results show that the prediction accuracy of the i EPSE is significantly higher than that of the ESPE, and it is in excellent agreement with the PSE which is regarded as the baseline for comparison. In addition, the unphysical multiple eigenmode problem in the EPSE is solved by using the i EPSE. As a local non-parallel stability analysis tool, the i EPSE has great potential application in the eNtransition prediction in general three-dimensional boundary layers.

关键词： parabolized stability equation(PSE) instability non-parallelism boundary layer

Energy-efficient power allocation for cross-media communications with hybrid VLC/RF

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第12期65卷 317-318页

作者： yufeng han Yue XIAO Yulan GAO Mingming WU Gang WU Wei XIANG National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China School of Engineering and Mathematical Sciences La Trobe University

Dear editor,In the sixth generation(6G), considerable research has been devoted to millimeter wave(mm Wave) and terahertz with the objective of addressing the expected spectrum scarcity and massive connectivity. Moreover, various transmission media, such as visible light, have been explored to enhance the data rate and adapt diverse scenarios [1].

关键词：

同方期刊数据库

Containment control for general discrete-time second-order multi-agent systems 36

在线全文

学校读者我要写书评

暂无评论

Containment control for general discrete-time second-order m...

A MXene-functionalized paper-based electrochemical immunosensor for label-free detection of cardiac troponin I

第36届中国控制会议

作者： Lei Shi Jinliang Shao Junyan Yu yufeng han School of Mathematical Science University of electronic science and technology

ISBN: (纸本)9781538629185

The containment control problem for general discrete-time second-order multi-agent systems is investigated in this *** on a distributed containment control algorithm with the state gain parameters in a given range,we transform the system to an equivalent error system,and then analyze the convergence of the error system by the eigenvalues of the corresponding coefficient ***,a necessary and sufficient condition is derived to guarantee that all the followers asymptotically converge to a convex hull formed by the leaders and numerical examples are presented to demonstrate the validity of the theoretical findings.

关键词： Containment control Multi-agent system General second-order dynamics

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

Journal of Semiconductors 2021年第9期42卷 53-60页

作者： Li Wang yufeng han Hongchen Wang Yaojie han Jinhua Liu Gang Lu Haidong Yu Institute of Advanced Materials(IAM)&Key Laboratory of Flexible Electronics(KLoFE) Nanjing Tech University(NanjingTech)Nanjing 211816China Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics(IFE)and Xi'an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

Convenient,rapid,and accurate detection of cardiac troponin I(cTnI)is crucial in early diagnosis of acute myocardial infarction(AMI).A paper-based electrochemical immunosensor is a promising choice in this field,because of the flexibility,porosity,and cost-efficacy of the ***,paper is poor in electronic conductivity and surface ***,we report a paper-based electrochemical immunosensor for the label-free detection of cTnI with the working electrode modified by MXene(Ti_(3)C_(2))*** order to immobilize the bio-receptor(anti-cTnI)on the MXene-modified working electrode,the MXene nanosheets were functionalized by aminosilane,and the functionalized MXene was immobilized onto the surface of the working electrode through *** large surface area of the MXene nanosheets facilitates the immobilization of antibodies,and the excellent conductivity facilitates the electron transfer between the electrochemical species and the underlying electrode *** a result,the paper-based immunosensor could detect cTnI within a wide range of 5-100 ng/mL with a detection limit of 0.58 ng/*** immunosensor also shows outstanding selectivity and good *** MXene-modified paper-based electrochemical immunosensor enables fast and sensitive detection of cTnI,which may be used in real-time and cost-efficient monitoring of AMI diseases in clinics.

关键词： paper-based immunosensor MXene electrochemical detection cardiac troponin I(cTnI)

Effects of Light Quality on Carbon and Nitrogen Assimilation and Root Activity of Eggplant

在线全文

学校读者我要写书评

暂无评论

Agricultural Science & Technology 2017年第12期18卷 2229-2231,2235页

作者： Yuefeng ZHAO Kun CHEN Qinghua ZhanG yufeng han Cangong han Shangqiu Academy of Agriculture and Forestry Sciences Shangqiu 476000China

[Objective] This study was conducted to provide theoretical and data reference for high-quality high-yield production of Shangqie 1 under controlled light quality environment and light quality control of other eggplant varieties. [Method] With Shangqie1 as an experiment material, the effects of red light, blue light, red-blue light, red-blue light and white light(control) on the carbon-nitrogen metabolism and root vitality of eggplant were investigated. [Result] Different light quality significantly affected sugar and starch contents in leaves of eggplant. Under the red-blue light(5∶1) treatment, the sucrose, total sugar and starch contents were the highest, and the values were higher than those under the white light treatment by 3.47%, 13.61% and 33.49%,respectively. The fructose content was the highest under white light. Under red-blue light(3∶1) and red-blue light(5∶1), the nitrate nitrogen contents were higher than that under white light, indicating that compound light affects nitrate content not only by simple superposition of light quality, but also by other type of interaction effect. The free amino acid and soluble protein contents under blue, red-blue(3∶1), red-blue(5∶1) and red light treatments were all higher than those under the white light treatment, and the blue light treatment exhibited the highest values, which were higher than those under white light by 24.89% and 46.62%, respectively, with significant differences. The red-blue light(5 ∶1) treatment exhibited the highest root vitality of eggplant, which was higher than that under the white light treatment by 31.85%. The red light treatment had the second highest root vitality, which was higher than that under the white light treatment by 19.30%, followed by the red-blue light(5∶1) treatment, and the blue light treatment showed the lowest value. [Conclusion] Under red-blue light(5 ∶1) treatment, eggplant had vigorous carbon-nitrogen metabolism and the highest root vitality.

关键词： Shangqie 1 Light quality Carbon-nitrogen metabolism Root vitality

在线全文

学校读者我要写书评

暂无评论

城市文脉与家国情怀—读蔺宝钢的雕塑创作

美术 2022年第2期650卷 81-84页

作者：韩禹锋西安建筑科技大学艺术学院

改革开放以来,社会经济文化进入转型和发展期,中国当代雕塑在自我觉醒和社会担当上真正迈出了脚步。城市雕塑作为公共场所的艺术品,是当代雕塑艺术的主要创作方向之一,它体现了一座城市的风格、风尚,是城市文化品位的集中表现。城市雕... 详细信息

改革开放以来,社会经济文化进入转型和发展期,中国当代雕塑在自我觉醒和社会担当上真正迈出了脚步。城市雕塑作为公共场所的艺术品,是当代雕塑艺术的主要创作方向之一,它体现了一座城市的风格、风尚,是城市文化品位的集中表现。城市雕塑的发展,反映了人民群众对于艺术需求不断上升的趋势,成为展现城市历史文化及人文精神的重要载体,被视为城市的“眼睛”[1]。蔺宝钢正是在这个社会转型期,开始走上了自己的艺术道路。

关键词：雕塑创作城市雕塑中国当代雕塑城市历史文化家国情怀城市文脉自我觉醒社会经济文化

高超声速平板边界层中波纹粗糙壁峰值热流的变化规律及预测

在线全文

学校读者我要写书评

暂无评论

航空学报 2023年第12期44卷 120-138页

作者：孔祥志韩宇峰天津大学高速空气动力学研究室天津300072

新型飞行器表面存在微烧蚀现象,会导致壁面局部热流增大。采用粗糙高度小于600μm的波纹型粗糙来模拟微烧蚀表面。通过直接求解Navier-Stokes方程,计算了均布波纹粗糙的壁面峰值热流的变化规律。结果发现,粗糙度引起的峰值热流与流向位... 详细信息

新型飞行器表面存在微烧蚀现象,会导致壁面局部热流增大。采用粗糙高度小于600μm的波纹型粗糙来模拟微烧蚀表面。通过直接求解Navier-Stokes方程,计算了均布波纹粗糙的壁面峰值热流的变化规律。结果发现,粗糙度引起的峰值热流与流向位置的0.5次方成反比;壁面峰值热流与粗糙高度成正比,并随宽度增大而减小,受高度的影响大于宽度。同时,马赫数和壁温对壁面峰值热流影响结果表明,相对峰值热流增量与马赫数成反比、与壁温成反比。在此基础上,基于光滑平板热流理论解,给出了粗糙壁峰值热流预测公式。详细的工况验证表明,该公式在马赫数4~10和壁温300~800 K范围内能够准确预测粗糙壁面峰值热流,误差不超过8%。对于其他壁面形式,如椭圆型和分散正弦型,该公式也具有一定的适用性。

关键词：高超声速粗糙壁气动热预测模型峰值热流

在线全文

学校读者我要写书评

暂无评论

汽轮发电机组轴向振动的分析和处理

振动工程学报 2004年第Z1期17卷 213-215页

作者：韩玉峰徐州电力试验中心徐州221009

从轴向振动的机理入手,结合现场试验研究,对汽轮发电机组轴向振动进行了详细的分析,提出了处理解决的方法,实践证明是行之有效的.

关键词：轴向振动发电机

Preparation and Characterization of Epoxy Protective Coatings Containing Polyaniline Nanowires

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

Preparation and Characterization of Epoxy Protective Coating...