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Actively tunable electromagnetically induced transparency in hybrid Dirac-VO2 metamaterials

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Optoelectronics Letters 2025年第1期21卷 13-20页

作者： DI Ke XIE Meng XIA Huarong CHENG Anyu liu yu DU Jiajia Department of Optoelectronic Engineering Chongqing University of Post and Telecommunications Chongqing Key Laboratory of Autonomous Navigation and Microsystem Chongqing University of Posts and Telecommunications Department of Automation Chongqing University of Post and Telecommunications

In this paper, we present a metamaterial structure of Dirac and vanadium dioxide（VO2） and investigate its optical properties using the finite-difference time-domain（FDTD） technique. Using the phase transition feature of VO2, the design can realize active tuning of the plasmon induced transparency（PIT） effect at terahertz frequency, thereby converting from a single PIT to a double-PIT. When VO2is in the insulating state, the structure is symmetric to obtain a single-band PIT effect. When VO2is in the metallic state, the structure turns asymmetric to realize a dual-band PIT effect. This design provides a reference direction for the design of actively tunable metamaterials. Additionally, it is discovered that the transparent window's resonant frequency and the Fermi level in this structure have a somewhat linear relationship. In addition, the structure achieves superior refractive index sensitivity in the terahertz band, surpassing 1 THz/RIU. Consequently, the design exhibits encouraging potential for application in refractive index sensors and optical switches.

关键词： Transparency

Ultrastrong room-temperature phosphorescence in cucurbit[8]uril-mediated crystalline supramolecules for ratiometric detection of phenethylamine

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Science China Chemistry 2025年

作者： Qingyu Niu Yingxiang Ye Lingna Su Xu He Zhiqiang Li yu liu School of Chemical Engineering and Technology Hebei University of Technology Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials Science Fujian Normal University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University College of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University

It is a great challenge to modulate purely organic fluorescence-phosphorescence dual emission in aqueous solution because the excited singlet and triplet states are in competition with each other. Herein, we report a crystalline 1:2 host-guest formed by selfassembly of 4-(4-bromophenyl)-pyridinium derivatives and cucurbit[8]uril, in which a rigid environment rich in weak interactions is directly demonstrated. Due to the inhibition of non-radiative transition and stabilization of triplet exciton in the crystalline environment, the crystalline inclusion complex exhibits ultralong room-temperature phosphorescence lifetime of 3.21 ms with an room-temperature phosphorescence(RTP) quantum yield up to 16.29%. Interestingly, the crystalline 1:2 hostguest complex demonstrates the ability of rapid identification and sensitive fluorescence-phosphorescence ratiometric detection behavior toward phenethylamine, a drug analogue, with a limit of detection as low as 27.5 nM. We believe that this study will undoubtedly broaden the utilizing scopes of RTP and offer a novel avenue for psychoactive substances monitoring.

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日本加入联合国始末

史学集刊 2025年第1期 133-144页

作者：刘子玉温州大学人文学院浙江温州325035

1952年6月日本正式提交入联申请时,联合国受美苏冷战等因素影响,难以通过规范的单独审议程序吸纳新成员。苏联提出共产主义阵营与西方阵营的申请国可以同时入联的“一揽子方案”,但遭到美国的强烈反对。1953年,联合国大会认为应以普适... 详细信息

1952年6月日本正式提交入联申请时,联合国受美苏冷战等因素影响,难以通过规范的单独审议程序吸纳新成员。苏联提出共产主义阵营与西方阵营的申请国可以同时入联的“一揽子方案”,但遭到美国的强烈反对。1953年,联合国大会认为应以普适性原则为基础,通过政治妥协打破入联僵局,尽早吸纳日本等国加入联合国。1955年,加拿大提出日本与蒙古等18个国家同时入联的方案,因中国台湾当局反对蒙古入联而失败。苏联随机应变,提出排除日蒙两国的“16国入联方案”,并顺利通过安理会与联合国大会审议,日本入联再度受挫。1956年10月,日苏恢复邦交,苏联承诺支持日本入联。1956年12月,日本正式加入联合国。1952—1956年间,日本入联进程深受美苏冷战及联合国职能与内部权力关系变化的影响,日本政府的外交努力难以发挥有效作用。

关键词：日本入联美苏冷战联合国大会

Surface analysis of tablets with and without coating film for common cold based on laser-induced breakdown spectroscopy

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Optoelectronics Letters 2025年

作者： YAO Lixing LI Jingwen liu yu SHEN Li WANG Cong Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics， School of Science， Tianjin University of Technology

Medications for common cold are used routinely in daily life， and most of these are compounded to be more effective for people suffering from common cold. The composition and quality of the coating， a common component of tablets， have been of great concern. In this paper， laser-induced breakdown spectroscopy (LIBS)， with advantages of rapid， real-time， and in-situ analysis， was used for surface analysis of tablets with and without coating film for common cold. Firstly， the spectra of compound paracetamol and amantadine hydrochloride tablets (CPAHT) and compound diclofenac sodium and chlorphenamine maleate tablets (CDSCMT)， without and with coating film， respectively， were analyzed. Secondly， two kinds of tablets were investigated in-situ at depth to analyze the changes of atomic and molecular spectral line intensities under different number of laser pulses and verified using LIBS imaging method. Finally， the Ca and Ti elements in CDSCMT were analyzed by calibration free LIBS (CF-LIBS) to further verify the elemental content differences at different depth in the tablets with coating film. These results indicate that the LIBS technology can be used in fast， in-situ， depth， and multi-element detection for cold medication tablets.

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Polarization-encoded neural networks with simplified grating patch

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Science China Technological Sciences 2025年

作者： Chengyan ZHONG Xiang WANG Lingfei LI yuanchi CUI Lei XIAO Dawei SONG Junxiong GUO Wen HUANG yufeng GUO yu liu College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation Centre Zhejiang University Nanjing Mumusili Technology Co. LTD School of Integrated Circuits Tsinghua University Institute of Advanced Study School of Electronic Information and Electrical Engineering Chengdu University State Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of China

Optical neural networks (ONNs) offer a promising solution for high-performance, energy-efficient artificial intelligence hardware by leveraging the parallelism and speed of light. However, the large-scale implementation of ONNs remains challenging due to the bulky footprint and complex control of optical synapses. In this work, we propose and simulate a plasmonic polarized synaptic architecture that overcomes the diffraction limit and enables ultra-compact ONNs. By tuning the polarization state of incident light, the optical transmittance through each plasmonic unit can be dynamically adjusted to represent a synaptic weight. Our plasmonic structures, with features as small as 40 nm, operate well below this limit in the visible spectrum (400–750 nm). Compared with diffraction and interference-based circuit designs, our proposed method achieves a substantial reduction in synaptic density by factors of 150000-fold and 1500-fold, respectively. Furthermore, we successfully demonstrate a proof-of-concept plasmonic ONN applied to the Canadian Institute for Advanced Research—10classes (CIFAR-10) dataset using a Visual Geometry Group network with 16 layers (VGG16) model. After training for 80epochs, the network achieves an accuracy of 93%. The polarization-tunable plasmonics paves the way towards scalable ONNs for next-generation artificial intelligence (AI) accelerators and smart sensors.

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生物质光发酵制氢技术研究进展

现代化工 2025年第1期45卷 56-61页

作者：屈皓李玉霞刘玉香太原理工大学环境科学与工程学院山西太原030001 晋中学院化学化工系山西晋中030619

回顾了生物质光发酵制氢的最新研究进展,对生物质预处理技术、制氢过程优化和工艺整合进行了总结分析,在此基础上,从提升制氢效率同时降低能耗方面对生物质光发酵制氢技术的未来发展做出展望。

关键词：生物质制氢光发酵制氢生物质预处理过程优化

Cultivation of Chlorella *** in inland saline-alkaline water under different light qualities

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Frontiers of Environmental Science & Engineering 2022年第4期16卷 59-68页

作者： Xiaoya liu yu Hong yu liu Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Inland saline-alkaline water can be used for the low-cost cultivation of microalgae,but whether algal biomass under various light sources has the potential to produce biodiesel remains to be ***,the influence of different light-emitting diode(LEDs)light colors(blue,red,white,mixed blue-red,and mixed blue-white LED)on the growth performance,lipid accumulation,and fatty acid composition of Chlorella *** cultivated in inland saline-alkaline water was *** highest algal density was obtained under blue LEDs at the end of cultivation,reaching 1.93±0.03 × 10^(7) cells/*** LEDs can improve biomass yield,total lipid yield,and triacylglycerol yield per algal *** main fatty acid components of Chlorella from inland saline-alkaline water were palmitic acid and linoleic *** Biodiesel Analyzer software was used to predict algal biodiesel quality by estimating different quality *** cetane number,kinematic viscosity,and density of Chlorella biodiesel were 51.714-67.69,3.583-3.845 mm^(2)/s,and 0.834-0.863 g/cm^(3),*** flirther proved that the Chlorella biomass obtained from inland saline-alkaline water has the potential to be used as a high-quality biodiesel feedstock.

关键词： Light quality Chlorella Inland saline-alkaline water Fatty acid Biodiesel property

基于共价有机骨架的水凝胶固相萃取在农药检测中的应用

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分析测试学报 2025年第1期44卷 145-154页

作者：孙蕾刘凌志刘玉碟沈晓芳新疆维吾尔自治区产品质量监督检验研究院新疆乌鲁木齐830011 江南大学食品学院江苏无锡214122

食品中农药残留超标对生物多样性以及人类健康造成潜在威胁。固相萃取技术广泛应用于农药的萃取,该方法的核心是吸附材料的选择。共价有机骨架(COFs)材料因其独特的优点在样品预处理中得到广泛的关注,而COFs的结构决定了材料的吸附性能... 详细信息

食品中农药残留超标对生物多样性以及人类健康造成潜在威胁。固相萃取技术广泛应用于农药的萃取,该方法的核心是吸附材料的选择。共价有机骨架(COFs)材料因其独特的优点在样品预处理中得到广泛的关注,而COFs的结构决定了材料的吸附性能,这对提高农药的萃取效果有重要作用。该研究制备了6种不同结构与性质的COFs(同一母体接枝不同官能团、具有不同带电性质、具有不同共轭结构),在不改变COFs结构的情况下,将其制备为COFs-海藻酸钠水凝胶(CACPs),建立了CACPs-分散固相萃取(CACPs-dSPE)方法,比较不同CACPs对氨基甲酸酯类、三唑类以及三嗪类农药的萃取效果。利用扫描电子显微镜、傅里叶变换红外光谱、X射线晶体衍射等方法对系列COFs以及系列CACPs的形貌、结构与性质进行表征。CACPs-dSPE结合高效液相色谱(HPLC)或紫外-可见分光光度法(UV-Vis)探究萃取效果,并结合理论计算模拟COFs与待测物的结合情况,探讨了不同CACPs对氨基甲酸酯类、三唑类以及三嗪类农药的吸附机理。结果表明:CACPs对不同类型农药的吸附性能是由其多孔结构性质(比表面积、孔径大小)和所负载COFs的固有结构协调决定,大的共轭结构、接枝羟基基团的COFs所制备的CACPs最有利吸附三类农药,其中Dt-TAPB-CACPs的萃取效果最佳。这为萃取农药过程中吸附材料的选择和设计提供了理论指导。

关键词：农药残留共价有机骨架 COFs-海藻酸钠水凝胶分散固相萃取(dSPE) 吸附机理

Core or edge? Revisiting GIScience from the geography-discipline perspective

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Science China Earth Sciences 2022年第2期65卷 387-390页

作者： yu liu Institute of Remote Sensing and Geographical Information Systems School of Earth and Space SciencesPeking UniversityBeijing 100871China

As an inter-disciplinary area between geography and computer sciences, geographical information science(GIScience) inherits the spatial analysis tradition of the former. Together with other branches of information geography, it seeks the balance between universality and particularity of geographical laws by combining methods from neighboring disciplines(such as big data and artificial intelligence) with the special nature of geographical spaces. Meanwhile, at the core position of the geography discipline, GIScience makes geography stronger from two directions: "strengthening the theoretical foundation" and "improving technology and promoting the practical applications".

关键词： Geographical information science Information geography Geography Characteristics of geographical spaces