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Fractal photonic anomalous Floquet topologicalinsulators to generate multiple quantum chiraledge states

Light(Science & Applications) 2023年第11期12卷 2498-2507页

作者： Meng Li Chu Li Linyu yan qiang Li Qihuang Gong yan Li State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-Optoelectronics Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China Hefei National Laboratory Hefei 230088China Peking University yangtze Delta Institute of Optoelectronics Nantong 226010China

Anomalous Floquet topological insulators with vanishing Chern numbers but supporting chiral edge modes are attracting more and more *** the existing anomalous Floquet topological insulators usually support only one kind of chiral edge mode even at a large lattice size,they are unscalable and unapplicable for multistate topological quantum ***,fractal topological insulators with self-similarity have been explored to support more nontrivial ***,we demonstrate the first experimental realization of fractal photonic anomalous Floquet topological insulators based on dual Sierpinski carpet consisting of directional couplers using the femtosecond laser direct *** fabricated lattices support much more kinds of chiral edge states with fewer waveguides and enable perfect hopping of quantum states with near unit transfer *** of zero-dimensional bound modes for quantum state transport in previous laser direct-written topological insulators,we generate multiple propagating single-photon chiral edge states in the fractal lattice and observe high-visibility quantum *** suggest the successful realization of highly indistinguishable single-photon chiral edge states,which can be applied in various quantum *** work provides the potential for enhancing the multi-fold manipulation of quantum states,enlarging the encodable quantum information capacity in a single lattice via high-dimensional encoding and many other fractal applications.

关键词： topological quantum chiral

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Preparation and characterization of porous ceramics prepared by kaolinite gangue and Al(OH)_3 with double addition of MgCO_3 and CaCO_3

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 450-454页

作者： Wen yan Nan Li Bing-qiang Han The Key State Laboratory Breeding Base of Refractories and Ceramics Wuhan University of Science and Technology Wuhan 430081 China

Porous ceramics were prepared from kaolinite gangue and Al（OH）3 with double addition of MgCO3 and CaCO3 by the pore-forming in-situ *** characterizations of porous ceramics were investigated by X-ray diffractometry,scanning electron microscopy,and mercury porosimetry measurements,*** is found that although the decomposition of MgCO3 and CaCO3 has little contribution to the porosity,the double addition of MgCO3 and CaCO3 strongly affects the formation of liquid phase,and then changes the phase compositions,pore characterization,and *** appropriate mode is the sample containing 1.17wt% MgCO3 and 1.17wt% CaCO3,which has high apparent porosity（41.0%）,high crushing strength（53.5 MPa）,high mullite content（76wt%）,and small average pore size（3.24 μm）.

关键词： porous ceramics characterization kaolinite aluminum hydrxide additives

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Effect of Indole Butyric Acid on the Transportation of Stored Calcium in Malus hupehensis Rhed. Seedling

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Agricultural Sciences in China 2006年第11期5卷 834-838页

作者： LI Jia yanG hong-qiang yan Tian-li SHU Huai-rui College of Horticulture Shandong Agricultural University Taian 271018 P.R. China College of Pharmacy Shandong University of Traditional Chinese Medicine Jinan 250014 P.R. China Zhejiang Institute of Subtropical Crops Wenzhou 325005 P.R.China

Calcium （Ca） plays an important role in the metabolism of higher plants. Recently, research on Ca^2＋ in plants has been focused especially at the cellular and molecular levels. Uptake, transport, and distribution are also very important for Ca to accomplish its function at the whole-plant level. In this experiment, one-year-old apple seedlings （M. hupehensis Rehd.） were investigated to determine the distribution of stored Ca, the different forms of Ca, and Ca^2＋-ATPase activity after treatment with indole butyric acid （IBA）. The results showed that the total Ca measured in mature leaves and Ca^2＋- ATPase activity in tender leaves were higher compared with those in the control （CK）. Calcium nitrate and calcium chloride （ALe-Ca） and calcium phosphate and calcium carbonate （HAC-Ca） decreased in both mature leaves and shoots, whereas water-soluble calcium （H2O-Ca）, calcium pectate （NaCl-Ca）, and calcium oxalate （HCl-Ca） increased. The percentage of active calcium, calcium pectate, and water-soluble calcium increased, whereas the percentage of calcium phosphate and calcium carbonate decreased. When treated with IBA, calcium fractions and percentage of the different forms of Ca was enhanced in 40 part per million （ppm） IBA compared with 20 ppm IBA and water. The results indicated that IBA increased the percentage of both active calcium （NaCl-Ca and H2O-Ca） in tender shoots and boosted the transportation of stored Ca in plants. IBA promoted Ca^2＋-ATPase activity and Ca^2＋ uptake in tender shoots of M. hupehensis. It can improve the total Ca contents and the relative percentage of Ca.

关键词： indole butyric acid stored calcium M. hupehensis Rehd.

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New insights into “dead lithium” during stripping in lithium metal batteries

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Journal of Energy Chemistry 2021年第11期30卷 289-294,I0007页

作者： Xiao-Ru Chen Chong yan Jun-Fan Ding hong-Jie Peng Qjang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084 China Advanced Research Institute of Multidisciplinary Science School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081 China Department of Chemical Engineering Stanford UniversityStanfordCA 94305USA

Lithium (Li) metal attributes to the promising anode but endures the low Columbic efficiency (CE) and safety issues from the inactive Li accumulation. The metallic Li which is isolated from the lithium anode (named dead Li^(0)) consists the major component of the inactive Li. We systematically and meticulously investigated the formation and evaluation of dead Li^(0) during stripping process from electron transfer, the oxidation of Li^(0) to Li^(+) and the diffusion of Li^(+) through solid electrolyte interphase (SEI). The above-mentioned processes were regulated by adjusting the contact sites of electron channels, the dynamic rate of conversion from Li^(0) to Li^(+), and the structure as well as components of SEI. The design principles for achieving less dead Li^(0) and higher CE are proposed as a proof of concept in lithium metal batteries. This new insight sheds a comprehensive light on dead Li^(0) formation and guides the next-generation safe batteries for future application.

关键词： Lithium metal batteries Dead lithium Lithium stripping Lithium dendrite growth Charge transfer

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Genetic basis of embryo and juvenile physiological responses to salinity changes in freshwater pipefish (Hippichthys heptagonus)

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Zoological Research 2023年第4期44卷 743-746页

作者： Shi-Xiang Feng Xin Wang Yuan Zhang Geng Qin qiang Lin yan-hong Zhang CAS Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Provincial Key Laboratory of Applied Marine BiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhouGuangdong 510301China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdaoShandong 266071China

DEAR EDITOR,Syngnathidae species commonly inhabit ocean ***,some have adapted to live exclusively in freshwater over long-term adaptive evolution but continue to retain physiological adaptations to saltwater *** genetic basis underlying the adaptive strategies and molecular regulation of freshwater syngnathids to freshwater and saltwater remains ***,we investigated the molecular characteristics and core gene expression in freshwater belly pipefish(Hippichthys heptagonus)embryos and juveniles through salinity stress experiments and transcriptome *** showed that embryonic exposure to salinity at a concentration of 30‰down-regulated cell cycle-associated genes vital to embryonic *** metabolism,neuroactive receptor interaction,and peroxisome proliferator-activated receptor signaling pathways were significantly enriched in up-regulated genes in the ***,there was no significant change in the expression of ion transport and energy metabolism ***,juvenile exposure to 30‰salinity up-regulated ion transport-related genes and significantly enriched immune-related signaling pathways,including lysosome,phagosome,autophagy,and mitophagy signaling *** metabolism genes were also up-regulated,whereas oxidative phosphorylation genes were significantly *** results suggest that brood pouch protection during the embryonic stage and salinity adaptation plasticity in juveniles may be strategic adaptations in freshwater pipefish.

关键词： metabolism salinity freshwater

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Solvent Effects on Spectral Property and Dipole Moment of the Lowest Excited State of Coumarin 343 Dye

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Chinese Journal of Chemical Physics 2012年第5期25卷 577-584,I0004页

作者： Li-lin Jiang Wei-long Liu Yun-fei Song Xing He yang Wang hong-lin Wu yan-qiang yang Center for the Condensed Matter Science and Technology Department of PhysicsHarbin Instituteof TechnologyHarbin 150001China Department of Physics and Electronics Information Engineering Hezhou UniversityHezhou 542800China

Steady-state absorption and fluorescence spectra, and time-resolved fluorescence spectra of coumarin 343 （C343） were measured in different solvents. The effect of the solvent on the spectral properties and dipole moment of the lowest excited state of C343 were investigated. It was found that the absorption and fluorescence spectra red-shifted slightly and strongly with increasing solvent polarity, respectively, because the charge distribution of the excited state leaded to the increasing difference between the absorption and fluorescence spectra with increasing solvent polarity. The dipole moment of the lowest excited state of C343 was determined from solvatochromic measurements and the quantum chemical calculation, and the results obtained from these two methods were fully consistent. Investigations of the time-resolved fluorescence of C343 in different solvents indicated that the fluorescence lifetimes increased nearly linearly with 4.45 ns in water. This can be ascribed between C343 and hydrogen donating increasing solvent polarity from 3.09 ns in toluene to to the intermolecular hydrogen bonding interactions solvents

关键词： Time-resolved fluorescence Dipole moment Solvent polarity function Quan-tum chemical calculation Intermolecular hydrogen bonding interaction

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Contact dynamics of elasto-plastic thin beams simulated via absolute nodal coordinate formulation

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Acta Mechanica Sinica 2016年第3期32卷 525-534页

作者： Qing-Tao Wang qiang Tian Hai-yan Hu State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics MOE Key Laboratory of Dynamics and Control of Flight Vehicle School of Aerospace Engineering Beijing Institute of Technology

Under the frame of multibody dynamics, the contact dynamics of elasto-plastic spatial thin beams is numerically studied by using the spatial thin beam elements of absolute nodal coordinate formulation（ANCF）. The internal force of the elasto-plastic spatial thin beam element is derived under the assumption that the plastic strain of the beam element depends only on its longitudinal deformation.A new body-fixed local coordinate system is introduced into the spatial thin beam element of ANCF for efficient contact detection in the contact dynamics simulation. The linear isotropic hardening constitutive law is used to describe the elasto-plastic deformation of beam material, and the classical return mapping algorithm is adopted to evaluate the plastic strains. A multi-zone contact approach of thin beams previously proposed by the authors is also introduced to detect the multiple contact zones of beams accurately, and the penalty method is used to compute the normal contact force of thin beams in contact. Four numerical examples are given to demonstrate the applicability and effectiveness of the proposed elasto-plastic spatial thin beam element of ANCF for flexible multibody system dynamics.

关键词： Elasto-plastic deformation Linear isotropic hardening constitutive law Absolute nodal coordinate formulation(ANCF) Thin beam multi-zone contact dynamics

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Biological Stimuli-responsive Polymer Systems:Design,Construction and Controlled Self-assembly

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Chinese Journal of Polymer Science 2018年第3期36卷 347-365页

作者： Miao-Miao Xu Ren-Jie Liu qiang yan Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China

Biological stimuli-responsive polymers have increasingly attracted attention in recent years because it can satisfy many requirements of applications related with human body while traditional systems do not *** to the importance of this burgeoning field,great efforts have been devoted and,up to now,polymer chemists have made a remarkable success in this prospective research *** this review,we systematically generalize the present state of biological stimuli-responsive polymer *** highlight several representative examples to specify the current problems and look ahead a clear sense of direction in this area.

关键词： Biological stimuli Responsive polymer Controlled self-assembly Biomedicine

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Polymerization Mechanism of Methyl Methacrylate Initiated by Ethyl Acetate/t-BuP_4

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Chinese Journal of Polymer Science 2019年第6期37卷 598-603页

作者： De-Yong Xia Qi-Min Jiang Wen-yan Huang hong-Jun yang Xiao-qiang Xue Li Jiang Bi-Biao Jiang Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou University Huaide College

The anionic polymerization of methyl methacrylate(MMA) was carried out using phosphazene base t-BuP_4 and ethyl acetate(EA) as the catalyst and the initiator, respectively. Gas chromatography(GC), size exclusion chromatography(SEC) measurements, and nuclear magnetic resonance(NMR) analyses were used to reveal the polymerization mechanism and to confirm the polymer structure. The results confirmed the proposed polymerization mechanism and the polymer structure, while the initiator efficiency was low. Meanwhile,the initiation by methoxy anion coming from hydrolysis of the ester bond in MMA was also observed. As a result, there is a marked deviation between the theoretical molecular weight and the measured molecular weight, and it is essential to carry out the polymerization at excessive dosage of t-BuP_4 for preparing polymers with narrow molecular weight distribution.

关键词： Phosphazene base(t-BuP4) Methyl methacrylate Ethyl acetate Anionic polymerization

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High-Efficiency Phosphorescent White Organic Light-Emitting Diodes with Stable Emission Spectrum Based on RGB Separately Monochromatic Emission Layers

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Chinese Physics Letters 2014年第4期31卷 122-125页

作者： ZHANG Zhi-qiang LIU Yi-Peng DAI yan-Feng CHEN Jiang-Shan MA Dong-Ge ZHANG hong-Mei State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chan~chun 130022 University of Chinese Academy of Sciences Beijing 100049 Department of Materials Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210023

Highly efficient phosphorescent white organic light-emitting diodes （WOLEDs） with stable emission spectra are successfully fabricated by using an RGB three-color separately monochromatic emission layer （EML） struc- ture. The EML consists of a sequence of bis（2-methyldibenzo[f, h]quinoxaline）（acetylacetonate） iridium （Ⅲ）（Ir（MDQ）2（acac）） doped tris（4-carbazoyl-9-ylphenyl）amine （TCTA） as the red emission layer, iridium, tris（2- phenylpyidine）（Ir（ppy）3） doped TCTA as the green emission layer and iridium（Ill） Ibis（4, 6-difuorophenyl）- pyridinato-N, C2＇]picolinate （FIrpic） doped a mixed-host of TCTA and tris（4-carbazoyl-9-ylphenyl）amine （26DCz PPy） as the blue emission layer. Without using any out-coupling techniques, the resulting WOLEDs achieve a power efficiency of 421m/W at lOO cd/m2, and 34 lm/W at 1000 cd/m2. The WOLEDs also show excellent spec- trum stability with bias voltages, remaining the Commission Internationale de L＇Eclairage coordinates at （0.44, 0.43） from 1000 cd/m2 to 10000 cd/m2 and the color rendering index is as high as over 80. We contribute the sta- ble emission spectrum to the RGB separate EML structure that successfully suppresses the undesired competition between host-guest energy transfer and direct exciton formation on emissive dopants by effectively controlling the position of exciton recombination region.

关键词： LIGHT emitting diodes MONOCHROMATIC light PHOSPHORESCENCE DOPING agents (Chemistry) EXCITON theory

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