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Nano Research 2024年第7期17卷 5856-5862页

作者： Xingyu Liu Xue Yang Han Sun Zekai Yang Haijun Chen Tianjin Key Laboratory of optoelectronic Thin Film Devices and Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

Ammonia has garnered recognition as a zero-carbon fuel due to its high-density hydrogen storage capacity and its convenience for storage and *** address the challenges associated with the direct usage of ammonia,the development of NH_(3)-to-H_(2)conversion technologies has emerged as a promising and effective ***,we present for the first time that crystallized Sm_(2)O_(3−x)electrodes demonstrate high and stable electrocatalytic activities,including N_(2)evolution rate and Faradaic efficiency,for ammonia electrolysis in a non-aqueous *** was observed that Sm^(2+)ions in samarium oxide play an indispensable role in the ammonia electrooxidation reaction on the ***,the mechanism of ammonia electrooxidation has also been elucidated,laying the foundation for a better understanding of the relationship between local structure and electrochemical properties in order to facilitate research on Pt-free electrocatalysts for the electrolysis of ammonia into H_(2).

关键词： NH_(3)-to-N_(2)conversion ammonia electrooxidation reaction ammonia electrolysis non-aqueous electrolyte samarium oxide

CToMP: a cycle-task-oriented memory protection scheme for unmanned systems

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science China(information sciences) 2024年第6期67卷 399-417页

作者： Chengyan MA Ning XI Di LU Yebo FENG Jianfeng MA School of Cyber engineering Xidian University School of Computer science and Technology Xidian University department of Computer and information science University of Oregon

Memory corruption attacks(MCAs) refer to malicious behaviors of system intruders that modify the contents of a memory location to disrupt the normal operation of computing systems, causing leakage of sensitive data or perturbations to ongoing processes. Unlike general-purpose systems, unmanned systems cannot deploy complete security protection schemes, due to their limitations in size, cost and *** in unmanned systems are particularly difficult to defend against. Furthermore, MCAs have diverse and unpredictable attack interfaces in unmanned systems, severely impacting digital and physical sectors. In this paper, we first generalize, model and taxonomize MCAs found in unmanned systems currently, laying the foundation for designing a portable and general defense approach. According to different attack mechanisms,we found that MCAs are mainly categorized into two types — return2libc and return2shellcode. To tackle return2libc attacks, we model the erratic operation of unmanned systems with cycles and then propose a cycle-task-oriented memory protection(CToMP) approach to protect control flows from tampering. To defend against return2shellcode attacks, we introduce a secure process stack with a randomized memory address by leveraging the memory pool to prevent Shellcode from being executed. Moreover, we discuss the mechanism by which CTo MP resists the return-oriented programming(ROP) attack, a novel variant of return2libc attacks. Finally, we implement CTo MP on CUAV V5+ with Ardupilot and Crazyflie. The evaluation and security analysis results demonstrate that the proposed approach CTo MP is resilient to various MCAs in unmanned systems with low footprints and system overhead.

关键词： unmanned system memory corruption attack memory protection system security randomized memory address

基于场诱导光致发光猝灭原理的CdSe量子点薄膜的非接触无损原位检测（英文）

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science China Materials 2024年第11期67卷 3570-3578页

作者：龚正李文豪张树钱李俊龙苏昊黄伟王堃朱嘉烨周雄图张永爱郭太良吴朝兴 College of Physics and information engineering Fuzhou University Fujian science & Technology Innovation Laboratory for optoelectronic information of China

CdSe量子点薄膜作为核心功能层,在各种光电器件中起着关键作用.量子点薄膜的厚度均匀性是决定其整体光电性能的关键因素之一.因此,获取大面积量子点薄膜的厚度分布十分重要.然而,传统的方法难以在不引入额外损伤的情况下快速获得其厚度... 详细信息

CdSe量子点薄膜作为核心功能层,在各种光电器件中起着关键作用.量子点薄膜的厚度均匀性是决定其整体光电性能的关键因素之一.因此,获取大面积量子点薄膜的厚度分布十分重要.然而,传统的方法难以在不引入额外损伤的情况下快速获得其厚度分布的相关信息.本文提出了一种原位检测CdSe量子点薄膜厚度均匀性的非接触式无损检测方法.这种原位检测方法的原理基于量子点薄膜在高电场作用下的光致发光猝灭现象,通过检测猝灭程度获得量子点薄膜的厚度信息.使用相机分别记录同一量子点薄膜在无电场和有电场情况下的光致发光图像.通过对这两幅图像的亮度分布进行变换,可以直观地得到量子点薄膜阵列的厚度信息.该方法为量子点发光显示器的制造提供了一种新的检测手段.

关键词： non-contact inspection non-destructive inspection field-induced photoluminescence quenching quantum dots

Regulating photothermal properties of near-infrared croconaine dyes by supramolecular assembly

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Nano Research 2024年第9期17卷 8560-8570页

作者： Yangge Ren Yue Lu Juanjuan Gao Yi Ding Bo Zhu Xinyu Hou Lin Jia department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China department of Electronic information Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The photochemical and photophysical properties of near-infrared(NIR)dyes are significantly influenced by their aggregation state and mesoscopic ***,beyond chemical synthesis,the regulation mechanisms for the properties of NIR dyes,particularly with respect to photothermal properties of the aggregates,are not yet fully ***,we investigate the photothermal behaviors of croconaine-based(CroA)NIR dyes containing dipeptide or amino acids *** introduction of hydrogen bonding promotesπ-πstacking of croconaine center,which can efficiently regulate aggregation states and assembly structures in *** laser irradiation,CroA aggregates undergo aggregation-dissociation transition,the in-situ monomer generation process regulates two parameters of photothermal performance:heating rates and plateau photothermal *** study reveals the regulation effect of non-covalent bonding interactions on CroA aggregates,highlighting supramolecular assembly strategy not only facilitates to construct of photothermal nanomaterials with well-defined structures,but also provides an alternative and effective method for regulating photothermal performance of NIR dyes.

关键词： croconaine dye hydrogen bonding photothermal performance supramolecular assembly chirality

BIO-inspired intelligent navigation: from methodology, system theory, to behavioural science

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science China(information sciences) 2024年第9期67卷 333-335页

作者： Wenshuo LI Xin LIU Pengwei HU Jian YANG Xiang YU Lei GUO Hangzhou Innovation Institute of Beihang University School of Automation science and Electrical engineering Beihang University School of Instrumentation and optoelectronic engineering Beihang University

It is crucial for unmanned systems to determine their motion information accurately, reliably, and in real time. This function is accomplished by the autonomous navigation module of the unmanned systems. By analogy to the animals,the autonomous navigation module can be regarded as the“sensory nerve center” of an unmanned system.

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In vivo 3-photon fluorescence microscopy of white matter in mouse brain excited at the 1700 nm window

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Journal of Innovative Optical Health sciences 2024年第5期17卷 81-87页

作者： Jie Huang Jincheng Zhong Shen Tong Yingxian Zhang Ping Qiu Ke Wang Key Laboratory of optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060P.R.China School of Medical information and engineering Xuzhou Medical UniversityXuzhou 221004P.R.China

White matter,a densely packed collection of myelinated axons,plays an essential part in neural *** high spatial resolution and deep penetration,multi-photon microscopy(MPM)is promising for white matter imaging in animal models in *** third harmonic generation(THG)signal can be generated from white matter,but the bottom part of the white matter layer generates weak THG due to its high ***,we demonstrate an in vivo labeling and imaging technology,capable of visualizing the white matter layer in the mouse brain,combining°uorescence labeling with MitoTracker Red and three-photon°uorescence(3PF)microscopy excited at the 1700 nm window.3PF signals are several times higher than THG signals,resulting in deeper imaging of the white matter layer with the *** results indicate that 3PF microscopy is a promising technology for white matter imaging in the deep brain in vivo.

关键词： Three-photon microscopy white matter myelin MitoTracker Red

Colloidal semiconductor nanocrystals for light emission and photonic integration

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Chip 2024年第1期3卷 1-17页

作者： Huan Liu Dabin Lin Puning Wang Tingchao He Rui Chen department of Electrical and Electronic engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Solution-processed colloidal semiconductor nanocrystals(NCs)have become attractive materials for the development of optoelectronic and photonic devices due to their inexpensive synthesis and excellent optical ***,CdSe NCs with different dimensions and structures have achieved significant progress in photonic integrated circuits(PICs),including light generation(laser),guiding(waveguide),modulation,and detection on a *** article summarizes the development of CdSe NCs–based lasers and discusses the challenges and opportunities for the application of CdSe NCs in ***,an overview of the optical properties of CdSe-based NCs with different dimensions is presented,with emphasis on the amplified stimulated emission and laser ***,the nanophotonic devices and PICs based on CdSe NCs are introduced and ***,the prospects for PICs are addressed.

关键词： CdSe nanocrystals Amplified spontaneous emission Waveguide Laser Photonic integrated circuits

Synergetic PVA degradation and H2 evolution in photocatalytic fuel cells using Ag@Fe_(2)O_(3) cathode

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Frontiers of Chemical science and engineering 2024年第1期18卷 85-93页

作者： Likun Sun Kesi Xiong Baoning Zhang Jinghong Fang Yingchao He Min Wang Zhixing Gan Fanglin Du Qiong Sun Liyan Yu Lifeng Dong College of Materials science and engineering Qingdao University of Science and TechnologyQingdao 266042China Center for Future optoelectronic Functional Materials School of Computer and Electronic InformationNanjing Normal UniversityNanjing 210023China department of Physics Hamline UniversitySt.Paul 55104USA

In a dual-chamber photocatalytic fuel cell device,polyvinyl alcohol degradation and H2 evolution were concurrently *** setup involved commercial P25 as the photoanode and Ag@Fe_(2)O_(3) nanoparticles as the ***,the feasibility of a Fentonlike reaction in the cathode,utilizing Fe^(2+)ions and pumped O_(2),was *** cathode materials,polyvinyl alcohol types,and pH values’effects were assessed on device *** tests highlighted photoinduced holes(h+)and OH·radicals as pivotal contributions to polyvinyl alcohol ***-term stability of the device was established through cycling experiments.

关键词： photocatalytic fuel cell PVA Ag@Fe_(2)O_(3) cathode materials Fenton-like reaction

Hybrid Block Diagonalization Precoding for Multi-User Weighted Sum-Rate Maximization

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China Communications 2024年第8期21卷 127-141页

作者： Su Xiaofeng Jiang Yi Key Laboratory for information science of Electromagnetic Waves(MoE) Department of Communication Science and EngineeringFudan UniversityShanghai 200433China

This paper studies large-scale multi-input multi-output(MIMO)orthogonal frequency division multiplexing(OFDM)communications in a broadband frequency-selective channel,where a massive MIMO base station(BS)communicates with multiple users equipped with *** develop a hybrid precoding design to maximize the weighted sum-rate(WSR)of the users by optimizing the digital and the analog precoders *** the digital part,we employ block-diagonalization to eliminate inter-user interference and apply water-filling power allocation to maximize the *** the analog part,the optimization of the PSN is formulated as an unconstrained problem,which can be efficiently solved by a gradient descent *** results show that the proposed block-diagonal hybrid precoding algorithm can outperform the existing works.

关键词： block-diagonal gradient descent hybrid precoding iterative optimization MIMO-OFDM multi-user water-filling power allocation weighted sum-rate maximization

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Circularly polarized lasing from chiral metal-organic frameworks

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Photonics Research 2024年第8期12卷 1654-1664页

作者： DEXIANG ZHU ZHOUYUANHANG WANG XIANGYU XU WENYU DU WEI HUANG YAN KUAI BENLI YU JIANZHONG ZHENG ZHIJIA HU SIQI LI information Materials and Intelligent Sensing Laboratory of Anhui Province Hefei 230601China School of Physics and optoelectronic engineering Anhui UniversityHefei 230601China Key Laboratory of Opto-Electronic information Acquisition and Manipulation of Ministry of Education Hefei 230601China School of Environmental science and engineering Nanjing Tech UniversityNanjing 211816China

Circularly polarized lasers play a pivotal role in classical optics,nanophotonics,and quantum optical information processing,while their fabrication remains *** article begins with examining the interactions between stimulated emission and chiral matter,outlining a simple strategy for producing circularly polarized lasing from chiral metal-organic frameworks(MOFs),such as the zeolitic imidazolate framework(ZIF),embedded with achiral laser dyes(L∕D-ZIF?dyes).It is found that the stimulated emission threshold and intensity are influenced by the interplay between the chiral polarization of the pump light and the inherent chirality of the MOF *** further present the design of a chiral vertical-cavity surface-emitting laser(VCSEL),comprising an L∕D-ZIF?dyes solid-state film sandwiched between a high-reflectivity distributed Bragg reflector(DBR)mirror and a silver *** cavity-based lasing exhibits higher asymmetry between emitting left-handed and right-handed polarized light compared to chiral spontaneous emission(SE)and amplified spontaneous emission(ASE),with an asymmetry value glum of approximately±*** value is nearly four-fold greater than that of SE and twice that of *** findings reveal a new approach to amplify chiral signals,promoting the comprehension and application of chiral–matter interactions,and offering a simple yet effective strategy to fabricate chiral lasers.

关键词： chiral polarized lasing

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