检索结果-内蒙古大学图书馆

作者： Sun, Ting Xing, Fei You, Zheng Wang, Xiaochu Li, Bin Department of Precision Instrument Tsinghua University Beijing 100084 China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing 100084 China Collaborative Innovation Center for Micro/Nano Fabrication Device and System Tsinghua University Beijing 100084 China

The star tracker is one of the most promising attitude measurement devices widely used in spacecraft for its high accuracy. High dynamic performance is becoming its major restriction, and requires immediate focus and promotion. A star image restoration approach based on the motion degradation model of variable angular velocity is proposed in this paper. This method can overcome the problem of energy dispersion and signal to noise ratio (SNR) decrease resulting from the smearing of the star spot, thus preventing failed extraction and decreased star centroid accuracy. Simulations and laboratory experiments are conducted to verify the proposed methods. The restoration results demonstrate that the described method can recover the star spot from a long motion trail to the shape of Gaussian distribution under the conditions of variable angular velocity and long exposure time. The energy of the star spot can be concentrated to ensure high SNR and high position accuracy. These features are crucial to the subsequent star extraction and the whole performance of the star tracker. © 2014 Optical Society of America.

关键词： Image reconstruction

来源：评论

学校读者我要写书评

暂无评论

Dispersion engineering and measurement in crystalline microresonators using a fiber ring etalon

引用

Photonics Research 2021年第11期9卷 2222-2229页

作者： XIAOBAO ZHANG GUOPING LIN TANG SUN QINGHAI SONG GUANGZONG XIAO HUI LUO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System School of ScienceHarbin Institute of TechnologyShenzhen 518055China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Dispersion engineering and measurement are significant for nonlinear photonic applications using whispering gallery mode ***,the Kerr microresonator frequency comb as an important example has attracted a great amount of interest in research fields due to the potential capability of full integration on a chip.A simple and cost-efficient way for dispersion measurements is thereby in high demand for designing such a microcomb ***,we report a dispersion measurement approach using a fiber ring etalon *** free spectral range of the etalon is first measured through sideband modulation,and the dispersion of the etalon is inferred by binary function fitting during the dispersion *** method is demonstrated on two MgF_(2) disk *** results show good agreement with numerical simulations using the finite element *** engineering on such resonators is also numerically investigated.

关键词： fiber resonator Dispersion

来源：评论

学校读者我要写书评

暂无评论

Effects of interlayer coupling on the excitons and electronic structures of WS_(2)/hBN/MoS_(2) van der Waals heterostructures

引用

nano Research 2022年第3期15卷 2674-2681页

作者： Xudan Zhu Junbo He Rongjun Zhang Chunxiao Cong Yuxiang Zheng Hao Zhang Songyou Wang Haibin Zhao Meiping Zhu Shanwen Zhang Shaojuan Li Liangyao Chen Key Laboratory of Micro and Nano Photonic Structures Ministry of EducationShanghai Engineering Research Center of Ultra-Precision Optical ManufacturingSchool of Information Science and EngineeringFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and EngineeringFudan UniversityShanghai 200433China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Grating Technology Laboratory Changchun Institute of Optics and Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Inserting hexagonal boron nitride(hBN)as barrier layers into bilayer transition metal dichalcogenides heterointerface has been proved an efficient method to improve two dimensional tunneling optoelectronic device ***,the physical picture of interlayer coupling effect during incorporation of monolayer(1L-)hBN is not explicit *** this article,spectroscopic ellipsometry was used to experimentally obtain the broadband excitonic and critical point properties of WS_(2)/MoS_(2)and WS_(2)/hBN/MoS_(2)van der Waals *** find that 1L-hBN can only slightly block the interlayer electron transfer from WS_(2)layer to MoS_(2)***,insertion of 1L-hBN weakens the interlayer coupling effect by releasing quantum confinement and reducing efficient dielectric ***,the exciton binding energies in WS_(2)/hBN/MoS_(2)heterostructures blueshift comparing to those in WS_(2)/MoS_(2)*** this exciton binding energies tuning process,the reducing dielectric screening effect plays a leading *** the meantime,the quasi-particle(QP)bandgap remains unchanged before and after 1L-hBN insertion,which is attributed to released quantum confinement and decreased dielectric screening effects canceling each *** QP bandgap as along with blueshift exciton binding energies lead to the redshift exciton transition energies in WS_(2)/hBN/MoS_(2)heterostructures.

关键词： two-dimensional(2D)van der Waals heterostructure interlayer coupling excitons critical points spectroscopic ellipsometry

来源：评论

学校读者我要写书评

暂无评论

Highly precise and efficient cell separation with parylene c micropore arrayed filtration membrane 19

Highly precise and efficient cell separation with parylene c...

引用

19th International Conference on Miniaturized systems for Chemistry and Life sciences, microTAS 2015

作者： Liu, Y. Wang, W. Wu, W. Li, H. Sun, Y. Institute of Microelectronics Peking University Beijing100871 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication 100871 China Innovation Center for Micro-Nano-Electronics and Integrated System Beijing100871 China No. 1 Hospital of Peking University Beijing100871 China School of Biological Science and Medical Engineering Beihang University Beijing100191 China

ISBN: (纸本)9780979806483

Very large scale micropore array has been recognized as a promising tool for separation and enrichment of rare targeted cells from a large sample volume. A high cell separation performance is strongly dependent on a small interspace between the separation pores (smaller than radius of the cell to avoid non-specific adhesion). Parylene C is a widely-used polymer in the MEMS for flexible thin film device preparation and some Parylene C based filtration devices have been applied for cell separation. This paper demonstrated a highly precise and efficient cell separation at a very high throughput driven only by the gravity with a very large scale (640000 micropores in 11 mm × 11 mm area) Parylene C micropore arrayed filtration membrane of ultra-high porosity. © 15CBMS-0001.

关键词： Cells

来源：评论

学校读者我要写书评

暂无评论

A highly linear stretchable MXene-based biocompatible hydrogel-elastomer hybrid with tissue-level softness

引用

science China Materials 2024年第10期67卷 3368-3378页

作者： Shu Wan Haizhou Huang Zisheng He Yizhou Ye Shen Li Shi Su Jiaxin Shen Longxiang Han Peng Wan Xu Ran Li Chen Xuefeng He Litao Sun Hengchang Bi Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationKey Disciplines Laboratory of Novel Micro-Nano Devices and System TechnologySchool of Optoelectronics EngineeringChongqing UniversityChongqing 400044China College of Photonic and Electronic Engineering Fujian Normal UniversityFuzhou 350117China School of Aeronautical Engineering Nanjing Vocational University of Industry TechnologyNanjing 210023China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjing 210096China The Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic EngineeringEast China Normal UniversityShanghai 200241China

Maintaining low modulus while endowing the wide-range linear stretchability to wearable or implantable devices is crucial for these devices to reduce the mechanical mismatch between the devices and human skin/tissue ***,improving linear stretchability often results in an increased modulus of stretchable electronic materials,which hinders their conformability in long-term quantifiable monitoring of ***,we develop a hybrid structure involving interlocking low-modulus porous elastomers(Ecoflex-0030)and MXene-based hydrogels with crosslinking networks of polyvinyl alcohol,sodium alginate,and *** hydrogel–elastomer structure exhibits superior performance compared with previous reports,with a wide linear stretchability strain range from 0 to 1000%and maintaining a low modulus of 6.4 ***,the hydrogel–elastomer hybrids can be utilized as highly sensitive strain sensors with remarkable characteristics,including high sensitivity(gauge factor~3.52),a linear correlation between the resistance and strain(0–200%),rapid response(0.18 s)and recovery times(0.21 s),and excellent electrical reproducibility(1000 loading–unloading cycles).Those electrical and mechanical properties allow the sensor to act as a suitable quantifiable equipment in organ monitoring,human activities detecting,and human–machine interactions.

关键词： linear stretchability low modulus MXene hydrogel-elastomer hybrid

来源：评论

学校读者我要写书评

暂无评论

Studies on Static Temperature Compensation for Vibrating Beam Accelerometer

Studies on Static Temperature Compensation for Vibrating Bea...

引用

2013 3rd International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2013)

作者： Lishuang Feng He Wang Zhen Zhou Gongliu Yang Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory Beihang University Key Laboratory of Micro-nano Measurement-manipulation and Physics (Ministry of Education) Beihang University

Static temperature model identification and compensation of vibrating beam accelerometer(VBA)are studied in this *** relationships between scale factor K1,zero bias K0 with temperature are obtained through static rolling test in 1g-gravitational *** accelerometer static temperature model between-40℃to 60℃is established using the least square *** error model is used for temperature compensation of *** show that the precision of fitting RMS error is improved by an order of magnitude.

关键词： Vibrating Beam Accelerometer Static temperature model Temperature compensation

来源：评论

学校读者我要写书评

暂无评论

Temperature-dependent optical response of phase-only nematic liquid crystal on silicon devices

引用

Chinese Optics Letters 2016年第11期14卷 85-89页

作者：张紫辰 Huan Xu 杨海宁尤政初大平 Institute of Microelectronics Chinese Academy of Sciences Electrical Engineering Division Department of EngineeringUniversity of Cambridge State Key Laboratory of Precision Measurement Technology and Instruments Collaborative Innovation Center for Micro/Nano FabricationDevice and System Department of Precision Instrument Tsinghua University

Wavelength-dependent birefringence and dielectric *** major optical properties of the nematie liquid crystal materials used in phase-only liquid crystal on silicon（LCOS） devices,are measured as a function of operating *** dynamic phase modulation depth and threshold voltage of these phase-only LCOS devices are also measured in the corresponding temperature range and compared with theoretical *** results show that the dynamic response time can he reduced significantly by an appropriate increase ol device operative temperature,while the necessary device elements,such as phase modulation depth and threshold voltage,can be maintained at the same time.

关键词： Birefringence Dielectric materials Display devices Liquid crystals Liquids Modulation Optical properties Phase modulation Threshold voltage

来源：评论

学校读者我要写书评

暂无评论

Graphene-based dual-function acoustic transducers for machine learning-assisted human-robot interfaces

引用

InfoMat 2023年第2期5卷 66-79页

作者： Hao Sun Xin Gao Liang-Yan Guo Lu-Qi Tao Zi Hao Guo Yangshi Shao Tianrui Cui Yi Yang Xiong Pu Tian-Ling Ren Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijingPeople's Republic of China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingPeople's Republic of China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingPeople's Republic of China School of Computer Science&Technology Beijing Institute of TechnologyBeijingPeople's Republic of China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijingPeople's Republic of China

Human–robot interface(HRI)electronics are critical for realizing robotic ***,we report graphene-based dual-function acoustic transducers for machine learning-assisted human–robot interfaces(GHRI).The GHRI functions both an artificial ear through the triboelectric acoustic sensing mechanism and an artificial mouth through the thermoacoustic sound emission *** success of the integrated device is also attributed to the multifunctional laser-induced graphene,as either triboelectric materials,electrodes,or thermoacoustic *** systematically optimizing the structure parameters,the GHRI achieves high sensitivity(4500 mV Pa^(–1))and operating durability(1000000 cycles and 60 days),capable of recognizing speech identities,emotions,content,and other information in the human *** the assistance of machine learning,30 speech categories are trained by a convolutional neural network,and the accuracy reaches 99.66%and 96.63%in training datasets and test ***,GHRI is used for artificial intelligence communication based on recognized speech *** work shows broad prospects for the development of robotic intelligence.

关键词： human-robot interface laser-induced graphene machine learning thermoacoustic triboelectric nanogenerator

来源：评论

学校读者我要写书评

暂无评论

nanoscale phase management of the 2D/3D heterostructure toward efficient perovskite solar cells

引用

science Bulletin 2024年第18期69卷 2853-2861页

作者： Hao Gu Annan Zhu Junmin Xia Wang Li Jiahao Zheng Tao Yang Shengwen Li Nan Zhang Shiliang Mei Yongqing Cai Shi Chen Chao Liang Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi’an Jiaotong UniversityXi’an 710049China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China

The stabilization of the formamidinium lead iodide(FAPbI_(3))structure is pivotal for the development of efficient photovoltaic *** two-dimensional(2D)layers to passivate the threedimensional(3D)perovskite is essential for maintaining the a-phase of FAPbI_(3) and enhancing the power conversion efficiency(PCE)of perovskite solar cells(PSCs).However,the role of bulky ligands in the phase management of 2D perovskites,crucial for the stabilization of FAPbI_(3),has not yet been *** this study,we synthesized nanoscale 2D perovskite capping crusts with=1 and 2 Ruddlesden-Popper(RP)perovskite layers,respectively,which form a type-Ⅱ 2D/3D *** heterostructure stabilizes the a-phase of FAPbI_(3),and facilitates ultrafast carrier extraction from the 3D perovskite network to transport contact *** introduced tri-fluorinated ligands to mitigate defects caused by the halide vacancies and uncoordinated Pb^(2+)ions,thereby reducing nonradiative carrier recombination and extending carrier *** films produced were incorporated into PSCs that not only achieved a PCE of 25.39%but also maintained 95%of their initial efficiency after 2000 h of continuous light exposure without *** findings underscore the effectiveness of a phase-pure 2D/3D heterostructure-terminated film in inhibiting phase transitions passivating the iodide anion vacancy defects,facilitating the charge carrier extraction,and boosting the performance of optoelectronic devices.

关键词： Phase-pure 2D perovskite 2D/3D heterostructure Type-II energy alignment Carrier dynamic FAPbI_(3)

来源：评论

学校读者我要写书评

暂无评论

system modeling based measurement error analysis of digital sun sensors

引用

Instrumentation 2015年第1期2卷 27-32页

作者： WEI M insong XING Fei WANG Geng YOU Zheng Department of Precision Instrument Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Collaborative Innovation Center for Micro / Nano Fabrication Device and SystemTsinghua University

Stringent attitude determination accuracy is required for the development of the advanced space technologies and thus the accuracy improvement of digital sun sensors is *** this paper,we presented a proposal for measurement error analysis of a digital sun sensor.A system modeling including three different error sources was built and employed for system error *** simulations were also conducted to study the measurement error introduced by different sources of *** on our model and study,the system errors from different error sources are coupled and the system calibration should be elaborately designed to realize a digital sun sensor with extra-high accuracy.

关键词： digital sun sensors measurement error system modeling numerical simulation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：