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Chemical Research in Chinese Universities 2024年第5期40卷 894-900页

作者： ZHOU Hongtao XU beihang ZHENG Xinjia GONG Jinchao ZHANG Kaitong HE Yonglin Key Laboratory of Advanced Light Conversion Materials and Biophotonics School of Chemistry and Life ResourcesRenmin University of ChinaBeijing100872P.R.China School of Mathematics Renmin University of ChinaBeijing100872P.R.China

Sensing materials possessing intrinsic color perception are indispensable prerequisites for the development of filterless photosensors,which could eliminate the need for complex device designs and avoid color distortion in *** materials are constrained by complex processing methods and limited ***,a color-photosensitive array based on ionic liquid with selective photothermal conversion(ILSPC)has been developed for intrinsic color *** on the selective absorption,photothermal conversion,and thermosensitivity of ILSPC,a photo-thermo-electric sensing system has been ***,the versatility of the two algorithms has been validated in color reconstruction and electrical signal *** an exploration,the photosensitive array showcases promising color recognition capabilities,potentially propelling the evolution of flexible photosensors.

关键词： Ionic liquid Filterless Intrinsic color perception Selective photothermal conversion Photosensitive array

Clinical management of a rare melanoma case arising from congenital melanocytic nevus

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Genes & Diseases 2024年第3期11卷 79-82页

作者： Ruixin Jiang Yan Wang Xuhui Ma Xinyang xuanyuan Yanjie Zhang Bin Jiang Weizhen Zhang Hanlin Zeng Department of Oncology Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai 201900China Department of Oncology The Third People's Hospital of ZhengzhouZhengzhouHenan 450000China Department of Oral&Maxillofacial-Head and Neck Oncology Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai 200125China Shanghai Institute of Precision Medicine Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai200125China Department of Dermatology Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai 200000China

Congenital melanocytic nevi(CMNs)are skin lesions characterized by benign melanocytic proliferations and present at birth or shortly *** and giant CMNs,with a projected adult size≥20 cm and 40 cm in diameter respectively,are more likely to develop into malignant *** most cases,melanoma arising from congenital melanocytic nevus(CMN)is particularly aggressive.

关键词： melanoma congenital melan

Suppressing the formation of SRZ in a Ni-based single crystal superalloy by RuNiAl diffusion barrier

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Progress in Natural Science:Materials International 2012年第2期22卷 146-152页

作者： Zhiming Bai,Dongqing Li,Hui Peng,Juan Wang,Hongbo Guo,Shengkai Gong School of Materials Science and Engineering,beihang university,no.37,Xueyuan road,Beijing 100191,China School of Materials Science and Engineering Beihang University No. 37 Xueyuan Road Beijing 100191 China

NiAl-based bond coats applied in thermal barrier coating(TBC)systems containing Ru and Pt have been studied in recent *** between the coatings and the underlying superalloy substrates usually results in degradation of the mechanical properties of the *** this paper,a NiAl/Ru coating was deposited onto a single crystal superalloy DD6 by electroplating and electron beam physical vapor deposition(EB-PVD).Interdiffusion behavior of the NiAl/Ru and NiAl coated specimens at 1100 1C was comparatively *** the NiAl coated specimen,after 100 h vacuum annealing,beneath the coating there was a 50 mm thickness secondary reaction zone(SRZ)with some needle-like topologically closed packed(TCP) *** no SRZ was observed in the NiAl/Ru coated *** may be attributed to the RuNiAl that acted as a diffusion barrier to prevent the inward diffusion of Al from the coating and the outward diffusion of refractory elements from the substrate,and hence suppressing the formation of TCP phases and SRZ in the superalloy.

关键词： NiAl RuNiAl Coating Interdiffusion Secondary reaction zone(SRZ)

Degradation of EB-PVD thermal barrier coatings caused by CMAS deposits

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Progress in Natural Science:Materials International 2012年第5期22卷 461-467页

作者： Hui Peng a,Lu Wang a,b,Lei Guo a,Wenhui Miao a,Hongbo Guo a,Shengkai Gong a a School of Materials Science and Engineering,beihang university,no.37,Xueyuan road,Beijing 100191,China b AVIC Shenyang Liming Aero-engine Group Corporation Ltd.,Shenyang 110043,China School of Materials Science and Engineering Beihang University No.37 Xueyuan Road Beijing 100191 China AVIC Shenyang Liming Aero-engine Group Corporation Ltd. Shenyang 110043 China

In aero-turbine engines,thermal barrier coatings(TBCs) must be capable to withstand harsh environments,such as high-temperature oxidation and ***,a new failure mode of TBCs caused by calcium-magnesium-alumina-silicate(CMAS) glass has attracted increasing *** this paper,yttria stabilized zirconia(YSZ) TBCs produced by electron beam physical vapor deposition(EB-PVD) were exposed to CMAS deposits at 1250℃.The microstructure evolution and failure mechanism of the coatings were *** has been shown that CMAS glass penetrated into the YSZ ceramic layer along the inter-columnar gaps and interacted with *** a result,an interaction zone of about 20μm thickness,which was the mixture of CMAS and YSZ with equiaxial structure,was formed in the YSZ surface layer after 4h heat-treatment at 1250℃.Meanwhile,yttria in YSZ layer as a stabilizer was dissolved in CMAS glass and caused accelerated monoclinic phase *** 8h heat-treatment,degradation of YSZ TBC occurred by delamination cracking of YSZ layer,which is quite different from the traditional failure caused by interfacial cracking at the YSZ/metallic bond *** models have been built to describe the failure mechanism of EB-PVD TBCs attacked by CMAS deposits.

关键词： Thermal barrier coatings(TBCs) Electron beam-physical vapor deposition(EBPVD) Calcium-magnesium-alumina-silicate(CMAS) Failure mechanism

教育的逆代际健康效应——基于《义务教育法》的证据

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经济科学 2024年第2期 199-216页

作者：彭雯静罗轩媛王耀璟北京大学经济学院

人力资本自上而下的代际传递是现有文献研究的重点,但鲜有文献关注人力资本自下而上的代际传递以及性别差异。本文基于中国健康与养老追踪调查数据,利用1986年《义务教育法》实施这一外生冲击,通过工具变量法研究子女教育对父母健康的... 详细信息

人力资本自上而下的代际传递是现有文献研究的重点,但鲜有文献关注人力资本自下而上的代际传递以及性别差异。本文基于中国健康与养老追踪调查数据,利用1986年《义务教育法》实施这一外生冲击,通过工具变量法研究子女教育对父母健康的影响及作用渠道。研究发现,子女教育提升显著改善了老年父母的生存预期、躯体健康、认知功能和抑郁情绪。进一步地,通过对情感和经济支持两方面的异质性机制分析,我们发现这种反哺模式呈现出“儿子出钱、女儿出力”的性别差异。

关键词：健康老龄化人力资本代际传递性别差异

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光伏系统串联型直流电弧检测技术研究

太阳能学报 2024年第6期45卷 285-295页

作者：王煊原龚春阳陈辉王志新上海交通大学电子信息与电气工程学院上海200240 上海电力大学自动化工程学院上海200090

搭建光伏系统串联型电弧实验平台,采集不同环境下50组电弧数据,提取出频域及小波域的能量特征与熵特征,绘制特征的分布情况。通过引入区分度对18种特征进行区分能力评价,评价结果表明,10~30 kHz频谱能量对电弧的区分能力最佳,对电弧状... 详细信息

搭建光伏系统串联型电弧实验平台,采集不同环境下50组电弧数据,提取出频域及小波域的能量特征与熵特征,绘制特征的分布情况。通过引入区分度对18种特征进行区分能力评价,评价结果表明,10~30 kHz频谱能量对电弧的区分能力最佳,对电弧状态与正常状态的区分度达到98.49%。研究逆变器启动、太阳辐照度变化及不同环境对特征的影响,分析10~30 kHz频谱能量在光伏系统中的抗扰能力。制作串联型电弧检测装置并提出其阈值的设定及推广方法,装置在多次实验中均可准确检测并迅速熄灭电弧,且在抗扰性实验中未发生误动作,动作时间可达到41 ms。

关键词：光伏系统串联电弧电弧检测特征提取抗扰性分析装置研制

Adaptive control for autonomous rendezvous of spacecraft on elliptical orbit

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Acta Mechanica Sinica 2009年第4期25卷 539-545页

作者： Shan Lu Shijie Xu School of Astronautics, beihang university,100191 Beijing, China School of Astronautics Beihang University Beijing China

A strategy for spacecraft autonomous rendezvous on an elliptical orbit in situation of no orbit information is developed. Lawden equation is used to describe relative motion of two spacecraft. Then an adaptive gain factor is introduced, and an adaptive control law for auton- omous rendezvous on the elliptical orbit is designed using Lyapunov approach. The relative motion is proved to be ultimately bounded under this control law, and the final relative position error can achieve the expected magnitude. Simulation results indicate that the adaptive control law can realize autonomous rendezvous on the elliptical orbit with relative state information only.

关键词： Autonomous rendezvous Elliptical orbit Lyapunov approach Adaptive control Gain factor

General solution to diagonal model matching control of multiple-output-delay systems and its applications in adaptive scheme

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Progress in Natural Science:Materials International 2009年第1期19卷 79-90页

作者： Yingmin Jia The Seventh Research Division,beihang university,Beijing 100083,China The Seventh Research Division Beihang University Beijing 100083 China

This paper mainly studies the model matching problem of multiple-output-delay systems in which the reference model is assigned to a diagonal transfer function matrix.A new model matching controller structure is first developed,and then,it is shown that the controller is feasible if and only if the sets of Diophantine equations have common *** obtained controller allows a parametric representation,which shows that an adaptive scheme can be used to tolerate parameter variations in the *** resulting adaptive law can guarantee the global stability of the closed-loop systems and the convergence of the output error.

关键词： Model matching control Decoupling Adaptation Time delays Multivariable systems Diophantine equations

Stabilization control of a bumblebee in hovering and forward flight

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Acta Mechanica Sinica 2009年第1期25卷 13-21页

作者： Yan Xiong Mao Sun Institute of Fluid Mechanics, beihang university,Beijing 100083, China Institute of Fluid Mechanics Beihang University Beijing China

Our previous study shows that the hovering and forward flight of a bumblebee do not have inherent stability （passive stability）. But the bumblebees are observed to fly stably. Stabilization control must have been applied. In this study, we investigate the longitudinal stabilization control of the bumblebee. The method of computational fluid dynamics is used to compute the control derivatives and the techniques of eigenvalue and eigenvector analysis and modal decomposition are used for solving the equations of motion. Controllability analysis shows that at all flight speeds considered, although inherently unstable, the flight is controllable. By feedbacking the state variables, i.e. vertical and horizontal velocities, pitching rate and pitch angle （which can be measured by the sensory system of the insect）, to produce changes in stroke angle and angle of attack of the wings, the flight can be stabilized, explaining why the bumblebees can fly stably even if they are passively unstable.

关键词： Insect - Hovering and forward flight - Stabilization control Navier-Stokes simulation Modal analysis