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氟化物磁光晶体的研究进展与应用

量子电子学报 2024年第2期41卷 194-206页

作者：吴振张中晗张振周声耀苏良碧武安华中国科学院赣江创新研究院材料与化学研究所江西赣州341119 中国科学技术大学稀土学院安徽合肥230026 中国科学院上海硅酸盐研究所人工晶体研究中心上海201899

光通信技术发展迅速,激光平均功率不断提高,磁光隔离器是保证激光单向传输、维持光学系统稳定高效工作的基础,而磁光介质作为磁光隔离器的核心部件也因此得以快速发展。首先简要介绍了几种磁光材料以及当前广泛应用的石榴石磁光晶体的... 详细信息

光通信技术发展迅速,激光平均功率不断提高,磁光隔离器是保证激光单向传输、维持光学系统稳定高效工作的基础,而磁光介质作为磁光隔离器的核心部件也因此得以快速发展。首先简要介绍了几种磁光材料以及当前广泛应用的石榴石磁光晶体的缺点、法拉第效应的原理和应用,随后系统分析了作为新一代磁光晶体的各类氟化物磁光晶体的优缺点,最后展望了CeF_(3)磁光晶体潜在的应用前景以及未来氟化物磁光晶体的发展趋势。

关键词：激光技术磁光晶体磁光隔离器法拉第效应氟化物磁光晶体 CeF_(3)

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某黏土型风化铁铌多金属矿选矿工艺研究

金属矿山 2024年第1期 213-219页

作者：胡红喜张忠汉刘超陈志强杨记平广东省科学院资源利用与稀土开发研究所广东广州510650 稀有金属分离与综合利用国家重点实验室广东广州510650 广东省矿产资源开发与综合利用重点实验室广东广州510650

某黏土型风化铁铌多金属矿石矿物成分较复杂,嵌布关系紧密,微细粒黏土矿物的存在严重影响有价元素铁、磷、铌的回收。试验采用原矿脱泥—浮选磷灰石—磁选选铁—重选烧绿石的工艺开展研究,通过脱泥以降低细泥对选别的影响,对脱泥后的物... 详细信息

某黏土型风化铁铌多金属矿石矿物成分较复杂,嵌布关系紧密,微细粒黏土矿物的存在严重影响有价元素铁、磷、铌的回收。试验采用原矿脱泥—浮选磷灰石—磁选选铁—重选烧绿石的工艺开展研究,通过脱泥以降低细泥对选别的影响,对脱泥后的物料进行磷灰石浮选试验,磷灰石浮选尾矿经磁选获得铁精矿,选铁尾矿采用选冶方法回收烧绿石。对含P_(2)O_5 8.56%、Fe 31.16%的原矿,试验获得了磷精矿含P_(2)O_530.78%、Fe 9.27%,对原矿磷回收率为45.95%;烧绿石回收作业获得磷精矿含P_(2)O_539.79%、对原矿回收率2.75%,总磷回收率48.70%;获得的铁精矿含Fe 60.73%、P_(2)O_51.00%,对原矿铁回收率为45.35%;获得铌渣含Nb_(2)O_519.64%,对原矿回收率20.98%。相对于原矿磷49.37%、铁55.45%的理论回收率,磷、铁资源得到了有效回收。

关键词：黏土矿物脱泥磷灰石磁铁矿烧绿石综合回收

Feature Fusion Based Hand Gesture Recognition Method for Automotive Interfaces

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Chinese Journal of Electronics 2020年第6期29卷 1153-1164页

作者： XU Qianyi QIN Guihe SUN Minghui YAN Jie JIANG Huiming zhang zhonghan College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computing and Knowledge Engineering Ministry of Education Jilin University College of Software Jilin University

Hand gesture recognition on the depth videos is a promising approach for automotive interfaces because it is less sensitive to light variation and more accurate than other traditional ***,video gestures recognition is still a challenging task since lots of interferences are induced by the uncorrelated gesture *** that if the displays are more relevant,the results will more accurate,so ResNext,a kind of compact and efficient neural network,is firstly used as feature extractor,then an improved weighted frame unification method is adopted to obtain the key frame samples,finally the Discriminant correlation analysis(DCA) is employed to fuse features for static data and dynamic data after conducting Feature embedding branch(FEB) on static *** public dataset named Depth based gesture recognition database(DGRD) is used in this paper,but the dataset is a little small and the class distribution is largely imbalance,and we find the performance of ResNext degrades badly in the condition of imbalance problem although it achieves excellent result at sufficient training *** order to conquer the disadvantages of limited dataset,a special loss function scheme combining the soft max loss and dice loss is *** of the algorithm performances in comparison with other state-of-the-art methods indicates that the proposed method is more practical for gesture recognition and may be widely adopted by automotive interfaces.

关键词： Feature fusion based hand gesture recognition method depth videos static data Other topics in statistics improved weighted frame unification method compact network Image recognition neural nets Feature embedding branch Depth based gesture recognition database automotive interfaces video gestures recognition Optical, image and video signal processing Computer vision and image processing techniques feature extraction feature extractor uncorrelated gesture factors efficient neural network key frame samples dynamic data gesture recognition learning (artificial intelligence) Knowledge engineering techniques

Optical and scintillation properties of Ce:Y_(3)Al_(5)O_(12) single crystal fibers grown by laser heated pedestal growth method

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Journal of Rare Earths 2021年第12期39卷 1533-1539,I0003页

作者： Xibin Wang Yun Dai zhonghan zhang Liangbi Su Huamin Kou Yangxiao Wang Anhua Wu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049.China

The single crystal scintillating optical fibers acting as the scintillators and light conductors show potential application in scintillating fiber array detectors with high spatial *** this paper we report the growth of 0.2 at%Ce:Y_(3)Al_(5)O_(12) single crystal *** crystalline phase,surface morphology of the axialsection and cro ss-section,optical and scintillation properties of the as-grown fiber were *** Ce:Y_(3)Al_(5)O_(12) single crystal fiber has a pure YAG phase,a uniform distribution of cerium in the axialsection and cross-section *** spectrum is composed of broad bands ranging from 440 to700 *** addition,the single crystal fiber has a high light yield of 26115±2000 photons/MeV,low energy resolution of 9.44%@662 keV and decay time of a fast component of 78 ns and a slow component of 301 *** intensity ratio of fast to slow components is roughly 8:1.

关键词： Ce:Y_(3)Al_(5)O_(12) Single crystal fiber Laser heated pedestal growth method Rare earth Scintillator

The ACTIVE study protocol:apatinib or placebo plus gefitinib as first-line treatment for patients with EGFR-mutant advanced non-small cell lung cancer(CTONG1706)

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Cancer Communications 2019年第1期39卷 607-614页

作者： zhonghan zhang Fan Luo Yang zhang Yuxiang Ma Shaodong Hong Yunpeng Yang Wenfeng Fang Yan Huang Li zhang Hongyun Zhao State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineGuangzhou 510060GuangdongP.R.China Department of Medical Oncology Sun Yat-sen University Cancer Center651 Dongfeng Road EastGuangzhou 510060GuangdongP.R.China Department of Clinical Research Sun Yat-sen University Cancer Center651 Dongfeng Road EastGuangzhou 510060GuangdongP.R.China

Background:Gefitinib,as the first epidermal growth factor receptor tyrosine kinase inhibitors(EGFR-TKI)approved for the treatment of advanced non-small cell lung cancer(NSCLC),has been proved to significantly improve the progression-free survival(PFS)in the first-line setting but suffers from resistance 7-10 months after treatment ***(YN968D1),a potent vascular endothelial growth factor receptor(VEGFR)2-TKI,specifically binds to VEGFR2 and leads to anti-angiogenetic and anti-neoplastic *** inhibition of VEGFR and EGFR path-ways represents a rational approach to improve treatment responses and delay the onset of treatment resistance in EGFR-mutant *** ACTIVE study aims to assess the combination of apatinib and gefitinib as a new treatment approach for EGFR-mutant NSCLC as a first-line ***:This multicenter,randomized,double-blind,placebo-controlled phase III study(NCT02824458)has been designed to assess the efficacy and safety of apatinib or placebo combined with gefitinib as a first-line treatment for patients with EGFR-mutant advanced NSCLC.A total of 310 patients with EGFR-mutation(19del or 21L858R),pathological stage IIIB to IV non-squamous NSCLC were to be *** primary endpoint is investigator assessment of PFS,and the secondary endpoints include independent radiological central(IRC)-confirmed PFS,overall survival(OS),objective response rate(ORR),disease control rate(DCR),time to progressive disease(TTPD),duration of response(DoR),quality of life(QoL)and *** patients are randomized in a 1:1 ratio to receive gefitinib(250 mg,p.o.q.d.)plus apatinib(500 mg,p.o.q.d.)or gefitinib plus placebo,given until disease progression or intolerable adverse *** biomarker analysis will be *** study is being conducted across China and comprises of 30 participating *** commenced in August 2017 and finished in December 2018,most of the patients are in the follow-up ***

关键词： NSCLC EGFR VEGFR Tyrosine kinase inhibitors Apatinib Gefitinib Randomized Double-blind Placebo Phase III

An in-situ spectroscopy investigation of alkali metal interaction mechanism with the imide functional group

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Nano Research 2020年第12期13卷 3224-3229页

作者： Xu Lian Zhirui Ma zhonghan zhang Jinlin Yang Shuo Sun Chengding Gu Yuan Liu Honghe Ding Jun Hu Xu Cao Junfa Zhu Shuzhou Li Wei Chen Department of Chemistry National University of SingaporeSingapore117543Singapore Centre for Advanced 2D Materials National University of SingaporeSingapore117546Singapore School of Materials Science and Engineering Nanyang Technological UniversitySingapore639798Singapore National University of Singapore(Suzhou)Research Institute Suzhou215123China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China National Synchrotron Radiation Laboratory Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei230029China Department of Physics National University of SingaporeSingapore117542Singapore

Organic anode materials have attracted considerable interest owing to their high tunability by adopting various active functional ***,the interaction mechanisms between the alkali metals and the active functional groups in host materials have been rarely studied ***,a widely used organic semiconductor of perylene-3,4,9,10-tetracarboxylic diimide(PTCDI)was selected as a model system to investigate how alkali metals interact with imide functional groups and induce changes in chemical and electronic structures of *** interaction at the alkali/PTCDI interface was probed by in-situ X-ray photoelectron spectroscopy(XPS),ultraviolet photoelectron spectroscopy(UPS),synchrotron-based near edge X-ray absorption fine structure(NEXAFS),and corroborated by density functional theory(DFT)*** results indicate that the alkali metal replaces the hydrogen atoms in the imide group and interact with the imide nitrogen of *** transfer induced gap states and downward band-bending like effects are identified on the alkali-deposited PTCDI *** was found that Na shows a stronger electron transfer effect than *** a model study of alkali insertion/intercalation in PTCDI gives insights for the exploration of the potential host materials for alkali storage applications.

关键词： perylene-3,4,9,10-tetracarboxylic diimide(PTCDI) lithium storage organic anode imide electron transfer

Bichromatically pumped artificial cnoidal wave breathers in optical microresonators

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Photonics Research 2024年第7期12卷 1464-1477页

作者： YIRAN GAO JIAN DAI zhonghan WU ANNI LIU TIAN zhang WEI SUN JUNQIU LIU KUN XU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Communication Engineering Hangzhou Dianzi UniversityHangzhou 310018China International Quantum Academy Shenzhen 518048China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

Breathers are localized structures that undergo a periodic oscillation in their duration and amplitude. Optical microresonators, benefiting from their high-quality factor, provide an ideal test bench for studying breathing phenomena. In a monochromatically pumped microresonator system, intrinsic breathing instabilities are widely observed in the form of temporal dissipative Kerr solitons which only exist in the effectively red-detuned ***, we demonstrate a novel bichromatic pumping scheme to create compulsive breathing microcombs via respectively distributing two pump lasers at the effectively blue-and red-detuned sides of a single *** experimentally discover the artificial cnoidal wave breathers and molecular crystal-like breathers in a photonic chip-based silicon nitride microresonator and theoretically describe their intriguing temporal dynamics based on the bichromatic pumping Lugiato–Lefever equation. In particular, the corresponding breathing microcombs exhibit diverse comb line spacing ranging from 2 to 17 times the free spectral range of the *** discovery not only provides a simple yet robust method to harness microcombs with reconfigurable comb line spacing but also reveals a new class of breathing waves in driven dissipative nonlinear systems.

关键词： pumped resonator pumping

Tellurate Nonlinear Optical Crystals

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Tellurate Nonlinear Optical Crystals

Homogenous coating of Li^(+)conductive Li_(5)AlO_(4)on single-crystalline nonstoichiometric Li_(1.04)Ni_(0.92)Al_(0.04)O_(2)for rechargeable lithium-ion batteries

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作者： Xutang Tao Junjie zhang zhonghan zhang Youxuan Sun State Key Laboratory of Crystal Materials Shandong University

Noncentrosymmetric(NCS) compounds are of current interest due to their multi-functional properties such as ferroelectricity,piezoelectricity,dielectric behavior,and second-order nonlinear optical(NLO) *** particular,their excellent nonlinear optical properties exhibit promising applications in the fields of frequency shifting,optical modulating telecommunications and signal ***,a class of new NCS materials have been synthesized with d0 transition metal cations(Mo6+ or W6+) and lone-pair cations(Se4+ or Te4+).Both kinds of ions are susceptible to the second-order Jahn-Teller effect which is believed to cause the unique properties of the materials *** BaTeMo2O9(β-BaTeMo2O9) 2 is such a typical *** group reported on the top-seeded solution growth of centimeter-sized single crystals and its functional properties.3,4 It has been demonstrated that β-BaTeMo2O9 possesses an effective NLO coefficient of 10.3 pm/V,being three times larger than that of KTP.4 Recently,centimeter-sized single crystals of Cs2TeMo3O12,5Na2TeW2O9,6 and Na2Te3Mo3O167 were successfully grown by our group,Halasyamani group,and Shen group,*** improve thermal conductivity of β-BaTeMo 2 O 9,we substitute Ba with *** systematically exploring the MgO-TeO 2-MoO3 ternary phase diagram,we identified *** measurements revealed that MgTeMoO6 exhibits strong SHG(～1.5 KTP),and is type-I phase-matchable.8

关键词： nonlinear optical crystals tellurate second-order Jahn-Teller(SOJT) crystal growth

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Journal of Energy Chemistry 2024年第8期95卷 651-659,I0014页

作者： Guoyu Ding Shizhou Wang Jinhan Li Ziyan Wu Jiayu Chen Jiayong Du Xinhui Huang Kuiming Liu Yudong zhang zhonghan Wu Yiyang Peng Qiancheng Zhao Meng Yu Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Engineering Research Center of High-efficiency Energy Storage(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Advanced Chemical Power Sources Nankai UniversityTianjin 300071China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Cobalt-free,nickel-rich LiNi_(1-x)Al_(x)O_(2)(x≤0.1)is an attractive cathode material because of high energy density and low cost but suffers from severe structural degradation and poor rate *** this study,we propose a molten salt-assisted synthesis in combination with a Li-refeeding induced aluminum segregation strategy to prepare Li_(5)AlO_(4)-coated single-crystalline slightly Li-rich Li_(1.04)Ni_(0.92)Al_(0.04)O_(2).The symbiotic formation of Li_(5)AlO_(4)from reaction between molten lithium hydroxide and doped aluminum in the bulk ensures a high lattice matching between the Ni-rich oxide and the homogenous conductive Li_(5)AlO_(4)that permits high Li^(+)*** from mitigated undesirable side reactions and phase evolution,the Li_(5)AlO_(4)-coated single-crystalline Li_(1.04)Ni_(0.92)Al_(0.04)O_(2)delivers a high specific capacity of220.2 mA h g^(-1)at 0.1 C and considerable rate capability(182.5 mA h g^(-1)at 10 C).Besides,superior capacity retention of 90.8%is obtained at 1/3 C after 100 cycles in a 498.1 mA h pouch full ***,the particulate morphology of Li_(1.04)Ni_(0.92)Al_(0.04)O_(2)remains intact after cycling at a cutoff voltage of 4.3 V,whereas slightly Li-deficient Li_(0.98)Ni_(0.97)Al_(0.05)O_(2)features intragranular cracks and irreversible lattice *** results highlight the value of molten salt-assisted synthesis and Li-refeeding induced elemental segregation strategy to upgrade Ni-based layered oxide cathode materials for advanced Li-ion batteries.

关键词： Aluminum segregation Surface coating Nonstoichiometric oxides Molten synthesis Cathode materials