检索结果-内蒙古大学图书馆

Physical mechanism of secondary-electron emission in Si wafers

Chinese Physics B 2024年第4期33卷 677-681页

作者：赵亚楠孟祥兆彭淑婷苗光辉高玉强彭斌崔万照胡忠强 State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China College of Aeronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi'an 710100China Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241000China

CMOS-compatible RF/microwave devices,such as filters and amplifiers,have been widely used in wireless communication ***,secondary-electron emission phenomena often occur in RF/microwave devices based on silicon(Si)wafers,especially in the high-frequency *** this paper,we have studied the major factors that influence the secondary-electron yield(SEY)in commercial Si wafers with different doping *** show that the SEY is suppressed as the doping concentration increases,corresponding to a relatively short effective escape depthλ.Meanwhile,the reduced narrow band gap is beneficial in suppressing the SEY,in which the absence of a shallow energy band below the conduction band will easily capture electrons,as revealed by first-principles ***,the new physical mechanism combined with the effective escape depth and band gap can provide useful guidance for the design of integrated RF/microwave devices based on Si wafers.

关键词： secondary-electron yield doping concentration escape depth Si wafer

来源：评论

学校读者我要写书评

暂无评论

Integrated navigation algorithm based on Vision-Inertial extended Kalman filter for low-cost Unmanned Aerial Vehicle

Integrated navigation algorithm based on Vision-Inertial ext...

引用

2023 International Conference on Computer, Artificial Intelligence, and Control Engineering, CAICE 2023

作者： Wu, Helong Sun, Lijun Hu, Yang Yang, Jianfeng China Electronic Product Reliability and Environment Testing Research Institute Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology Guangdong Provincial Engineering Technology Research Center of UAV Reliability and Safety Guangzhou China

ISBN: (纸本)9781510665040

In order to solve the problem of low attitude estimation accuracy of low-cost UAV without GNSS (Global Navigation Satellite System) signal, the integrated navigation algorithm was improved. Binocular vision sensor is introduced as the observation sensor, and the position and attitude angle of the image information collected by binocular camera were estimated by the SLAM theory, the position and attitude angle were entered into the EKF algorithm, and the Vision Inertial EKF(VI-EKF) algorithm is established. It realizes the high-precision navigation of low-cost UAV without GNSS signal. The biases of gyroscope and accelerometer are calculated by the relative motion increment between the two key frames of binocular camera and IMU pre-integration data, and these two biases were taken as observations to update IMU bias in the process of EKF algorithm. In this paper, the effectiveness of IMU pre-integration algorithm is verified firstly, and then the VI-EKF navigation algorithm is compared with the pure visual SLAM algorithm through dataset simulation. The simulation results show that the VI-EKF algorithm proposed in this paper has a good performance in the environment without GNSS signal. © 2023 SPIE.

关键词： Unmanned aerial vehicles (UAV)

来源：评论

学校读者我要写书评

暂无评论

A fine-grained deconfounding study for knowledge-based visual dialog

引用

Visual Informatics 2024年第4期8卷 36-47页

作者： An-An Liu Quanhan Wu Chenxi Huang Chao Xue Xianzhu Liu Ning Xu School of Electrical and Information Engineering Tianjin UniversityTianjinChina Tiandy Technologies Co. LtdTianjinChina National and Local Joint Engineering Research Center of Space Optoelectronics Technology Changchun University of Science and TechnologyChangchunChina College of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchunChina

Knowledge-based Visual Dialog is a challenging vision-language task,where an agent engages in dialog to answer questions with humans based on the input image and corresponding commonsense *** debiasing methods based on causal graphs have gradually sparked much attention in the field of Visual Dialog(VD),yielding impressive ***,existing studies focus on the coarse-grained deconfounding,which lacks a principled analysis of the *** this paper,we propose a fined-grained study of deconfounding on:(1)We define the confounder from two *** first is user preference(denoted as Uh),derived from human-annotated dialog history,which may introduce spurious correlations between questions and *** second is commonsense language bias(denoted as Uc),where certain words appear so frequently in the retrieved commonsense knowledge that the model tends to memorize these patterns,thereby establishing spurious correlations between the commonsense knowledge and the answers.(2)Given that the current question directly influences answer generation,we further decompose the confounders into Uh1,Uh2 and Uc1,Uc2,based on their relevance to the current ***,Uh1 and Uc1 represent dialog history and high-frequency words that are highly correlated with the current question,while Uh2 and Uc2 are sampled from dialog history and words with low relevance to the current *** a comprehensive evaluation and comparison of all components,we demonstrate the necessity of jointly considering both Uh and ***-grained deconfounding,particularly with respect to the current question,proves to be more *** studies,quantitative results,and visualizations further confirm the effectiveness of the proposed method.

关键词： Visual dialog Knowledge Deconfounding Causality

来源：评论

学校读者我要写书评

暂无评论

High-throughput phenotyping techniques for forage:Status,bottleneck,and challenges

Artificial Intelligence in Agriculture

引用

Artificial Intelligence in Agriculture 2025年第1期15卷 98-115页

作者： Tao Cheng Dongyan Zhang Gan Zhang Tianyi Wang Weibo Ren Feng Yuan Yaling Liu Zhaoming Wang Chunjiang Zhao College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China National Center of Pratacultural Technology Innovation(under preparation) Hohhot 010000China College of Engineering China Agricultural UniversityBeijing 100083China School of Ecology and Environment Inner Mongolia UniversityHohhot 010021China Information Technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China

High-throughput phenotyping(HTP)technology is now a significant bottleneck in the efficient selection and breeding of superior forage genetic *** better understand the status of forage phenotyping research and identify key directions for development,this review summarizes advances in HTP technology for forage phenotypic analysis over the past ten *** paper reviews the unique aspects and research priorities in forage phenotypic monitoring,highlights key remote sensing platforms,examines the applications of advanced sensing technology for quantifying phenotypic traits,explores artificial intelligence(AI)algorithms in phenotypic data integration and analysis,and assesses recent progress in phenotypic *** practical applications of HTP technology in forage remain constrained by several *** include establishing uniform data collection standards,designing effective algorithms to handle complex genetic and environmental interactions,deepening the cross-exploration of phenomics-genomics,solving the problem of pathological inversion of forage phenotypic growth monitoring models,and developing low-cost forage phenotypic *** these challenges will unlock the full potential of HTP,enabling precise identification of superior forage traits,accelerating the breeding of superior varieties,and ultimately improving forage yield.

关键词： Forage High-throughput phenotyping Precision identification Sensors Artificial intelligence Efficient breeding

来源：评论

学校读者我要写书评

暂无评论

Antenna Design for Modern Mobile Phones: A Review

引用

Electromagnetic Science 2024年第2期2卷 55-90页

作者： Yan Wang Libin Sun Zhengwei Du Zhijun Zhang Key Laboratory for Information Science of Electromagnetic Waves(MoE) School of Information Science and TechnologyFudan UniversityShanghai 200433China Shanghai Huawei Technologies Ltd.Shanghai 201206China Beijing National Research Center for Information Science and Technology Department of Electronic EngineeringTsinghua UniversityBeijing 100084China

Due to limited antenna space,high communication requirements,and strict regulatory constraints,the design of antennas for modern mobile phones has become an exceedingly challenging *** recent years,numerous studies have been conducted in this area,leading to significant *** review paper comprehensively summarizes recent progress made in antenna design for modern mobile ***,the challenges faced in antenna design for modern mobile phones are described,including bandwidth enhancement,integration and decoupling techniques,mm-wave array antennas,satellite communication antennas,as well as interactions between mobile antennas and the human ***,the basic antenna types(such as inverted-F,slot,loop,and planar inverted-F antennas)commonly used in modern metal-bezel mobile phones along with their key characteristics are briefly ***,the commonly exployed methods used in practical applications for designing wideband antennas within compact sizes and achieving decoupling among multiple antennas with wide bandwidths are ***,recent advances in the design of compact,wideband,and wide-angle scanning mm-wave arrays for modern mobile phones are ***,recent progress made in satellite communication antenna designs for modern mobile phones,including broadside and end-fire radiation patterns,is ***,recent studies on the interaction between mobile antennas and the human body are briefly ***,the future challenge of antenna design for mobile phones is briefly *** is our hope that this comprehensive review will provide readers with a systematic understanding of antenna design principles applicable to modern mobile phones.

关键词： Mobile antenna Bandwidth Decoupling mm-wave antenna Satellite communication antenna Specific absorption rate

来源：评论

学校读者我要写书评

暂无评论

Regulating local electric field to optimize the energy storage performance of antiferroelectric ceramics via a composite strategy

引用

Journal of Advanced Ceramics 2023年第3期12卷 598-611页

作者： Ying Yang Zhanming Dou Kailun Zou Kanghua Li Wei Luo Wen Dong Guangzu Zhang Qiuyun Fu Shenglin Jiang School of Optical and Electronic Information Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China China Zhenhua Group Yunke Electmnics Co. Ltd.Guiyang 550018China

Electrostatic energy storage technology based on dielectrics is the basis of advanced electronics and high-power electrical *** polarization(P)and high electric breakdown strength(Eb)are the key parameters for dielectric materials to achieve superior energy storage *** this work,a composite strategy based on antiferroelectric dielectrics(AFEs)has been proposed to improve the energy storage ***,AlN is selected as the second phase for the(Pb_(0.915)Ba_(0.04)La_(0.03))(Zr_(0.65)Sn_(0.3)Ti_(0.05))O_(3)(PBLZST)AFEs,which is embedded in the grain boundaries to construct insulating networks and regulate the local electric field,improving the ***,it is emphasized that AFEs have the AFE–FE and FE–AFE phase transitions,and the increase of the phase transition electric fields can further improve the recoverable energy density(Wrec).As a result,the Eb increases from 180 to 290 kV·cm−1 with a simultaneous increase of the phase transition electric fields,magnifying the Wrec to~144%of the pristine *** mechanism for enhanced Eb and the phase transition electric fields is revealed by the finite element simulation ***,the PBLZST:1.0 wt%AlN composite ceramics exhibit favorable temperature stability,frequency stability,and charge–discharge ability,making the composite ceramics a promising candidate for energy storage applications.

关键词： energy storage antiferroelectric composites local electric field electric breakdown strength

来源：评论

学校读者我要写书评

暂无评论

Dynamic Monitoring of Acne Progression and Quantitative Severity Assessment Using Optical Coherence Tomography 17

Dynamic Monitoring of Acne Progression and Quantitative Seve...

引用

17th International Conference on Photonics and Imaging in Biology and Medicine, PIBM 2024

作者： Chen, Zhida Lin, Hui Li, Yao Zhong, Cheng Li, Zhifang Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education Fujian Provincial Engineering Technology Research Center of Photoelectric Sensing Application Fujian Provincial Key Lab of Photonic Technology Information Photonics Research Center College of Photonic and Electronic Engineering Fujian Normal University Fujian Fuzhou350007 China

ISBN: (数字)9781510688070

ISBN: (纸本)9781510688063

Acne vulgaris, a common dermatological condition affecting the pilosebaceous follicular unit, arises from a complex interplay of factors including hyperseborrhea, Propionibacterium acnes colonization, hyperkeratosis, and inflammation. Existing pharmacodynamic evaluation techniques do not facilitate real-time and non-invasive assessment of acne and its severity within living *** this study, the aim was to establish a murine model of acne vulgaris, elucidate its pathological processes, and quantitatively assess the severity of the condition using non-invasive imaging techniques. We employed optical coherence tomography (OCT) in conjunction with microscopy to scrutinize the complete life cycle of acne lesions. microscopy provided insights into the micro-anatomical characteristics of murine skin lesions, while OCT allowed for the assessment of skin structural changes. Our findings indicate that the epidermis undergoes hyperplasia concurrent with acne development, and the subsequent reparative phase is marked by scab *** deep learning algorithms enabled the precise quantification of epidermal and scab thickness variations. This novel approach provides a unique perspective for acne assessment, potentially guiding more precise clinical drug selection and improving therapeutic outcomes. © 2025 SPIE.

关键词： Optical coherence tomography

来源：评论

学校读者我要写书评

暂无评论

Wideband Microstrip Antenna in Small Volume Without Using Fundamental Mode

引用

Electromagnetic Science 2023年第2期1卷 71-76页

作者： Yongjian Zhang Yue Li Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 10084China

Microstrip antennas are of significant interest and extensively utilized in communication systems because of their unique low ***,the general difficulty in microstrip antenna design lies in its wideband electromagnetic radiation within a low-profile *** enhance the bandwidth,superposing the fundamental mode and other high-order modes is the most common method,but this occupies a larger footprint than regular narrow-band ***,as a counterintuitive way to broaden the bandwidth,a wideband miniaturized microstrip antenna is proposed by using two high-order *** avoidance of the fundamental mode allows for footprint miniaturization without decreasing the bandwidth,providing a different but feasible design strategy for wideband microstrip *** with other microstrip antennas at the same profile,the proposed antenna achieves wider bandwidth and a smaller *** experimental result shows a bandwidth of 4.81–6.01 GHz is achieved with a volume of 0.47×0.47×0.043 λ_(0)^(3),whereλ0 represents the in-vacuum wavelength at the center ***,the proposed design provides an effective solution to the intrinsic contradiction between wideband electromagnetic radiation and compact antenna dimensions,not only in a low profile but in a small footprint,contributing to the fundamental development of microstrip antennas.

关键词： Microstrip antennas Wideband antennas High-order modes Low profile Small footprint.

来源：评论

学校读者我要写书评

暂无评论

Subpixel-based Bidirectional Distortion Correction for Two-dimensional Astronomical Fiber Spectral Images

引用

research in Astronomy and Astrophysics 2025年第3期25卷 48-59页

作者： Dong-Sheng Hu Chuan-Qi Chen Hao-Jie Yang An-Zhi Wang Gang Yue Zhao-Xv Gan Xu-Dong Chen Yun-Xiang Yan Yue Zhong Zhi Xu Zhong-Quan Qu Peng-Fei Wang Tao Geng Shuang Chen Wei-Min Sun Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Qingdao Innovation and Development Center of Harbin Engineering University Yunnan Observatory of Chinese Academy of Sciences State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center

This paper proposes a subpixel transformation method to correct Keystone and Smile distortions in fiber spectral images from the Fiber Arrayed Solar Optical Telescope. These distortions affect the spatial and spectral positions,degrading resolution and accuracy. To correct Keystone distortion, we use a local summation and peak-finding method to locate central horizontal coordinates, calculate shifting values, and straighten the curves. For Smile distortion, we use quartic polynomial fitting based on absorption lines at different wavelengths. This technique preserves subpixel components, redistributes pixel values, and interpolates non-fiber portions, rectifying the spectra for accurate analysis. The method can also be applied to other astronomical projects like Large Sky Area MultiObject Fiber Spectroscopic Telescope, enhancing the accuracy and reliability of spectral data in various astronomical studies.

关键词： methods: miscellaneous techniques: image processing techniques: miscellaneous techniques: spectroscopic

来源：评论

学校读者我要写书评

暂无评论

Survey and Analysis of NFT and Blockchain Technologies for Developing Agricultural Product Trading Systems 20

Survey and Analysis of NFT and Blockchain Technologies for D...

引用

20th International Joint Conference on Computer Science and Software Engineering, JCSSE 2023

作者： Phunsa, Suwichai Noiumkar, Preecha Chomsiri, Thawatchai Mahasarakham University Digital Contents for Development Research Unit Faculty of Informatics Department of Creative Media Mahasarakham Thailand Mahasarakham University Research Center of Information Technology for the Future Faculty of Informatics Department of Information Technology Mahasarakham Thailand

ISBN: (纸本)9798350300505

In this research, we have surveyed NFT technology and Blockchain technology. We have analyzed both technologies to apply them in the agricultural product trading to benefit farmers the most. We have examined the strengths of NFT and NFT Marketplace to find ways to utilize these strengths in agricultural product trading. Additionally, we have identified various obstacles and suggested solutions. From the research, we have found that agricultural product trading through NFT Marketplace can provide benefits such as transparency, allowing buyers and sellers to verify the relevant transactions, the number of trades, the initial purchase price, and the final selling price. Moreover, the NFT's ownership information cannot be forged as they are on the Blockchain. By integrating the system with the community enterprise, the government's support, and using crypto seed phrases and private keys tied to accounts, farmers can receive KYC (Know Your Customer) and prevent fraud. Furthermore, NFT Marketplace can show sales transactions of each product category, which can help farmers understand market demand and popularity. Additionally, buyers can choose popular and trustworthy sellers (farmers) based on transaction history. © 2023 IEEE.

关键词： Blockchain

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：