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Effects of pH on the peripheral light-harvesting antenna complex for Rhodopseudomonas palustris

science china({2. sciences) 2008年第8期51卷 760-766页

作者： feng juan, li xuefeng & liu yan school of life science and technology, University of {2. science and technology of china, Chengdu 6.0054, china school of life {2. and technology University of Electronic Science and Technology of China Chengdu China

In this work steady-state absorption spectroscopy, circular dichroism spectroscopy and sub-micro-second time-resolved absorption spectroscopy were used to investigate the effect of pH on the struc-tures and functions of LH2.complex for Rhodopseudomonas palustris. The results revealed that: (1) B800 Bchla was gradually transformed to free pigments absorbing around 76. nm on the minutes timescale upon the induction of strong acidic pH, and subsequently there disappeared the CD signal for Qy band of B800 in the absence of B800. In addition, Carotenoids changed with the similar tendency to B850 BChl. (2. The introduction of strong basic pH gave rise to no significant changes for B800 Bchla, while B850 BChla experienced remarkable spectral blue-shift from 852.to 837 nm. Similar phe-nomenon was seen for the CD signal for Qy band of B850. Carotenoids displayed strong and pH-independent CD signals in the visible range. (3) In the case of both physiological and basic pH, broad and asymmetrical positive Tn←T1 transient absorption appeared following the pulsed photo-excitation of Car at 532.nm. By contrast, the featureless and weak positive signal was observed on the sub-microsecond timescale in the acidic pH environment. The aforementioned experimental results indicated that acidic pH-induced removal of B800 Bchla prevented the generation of the caro-tenoid triplet state (3Car*), which is known to be essential for the photo-protection function. Neverthe-less, carotenoids can still perform this important physiological role under the basic pH condition, where the spectral blue shift of B850 exerts little effect on the overall structure of the cyclic aggregate, therefore favoring the formation of carotenoid triplet state.

关键词： pH-induced B800-removal triplet state photo-protection function

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Classical spin liquid state in a rhombic lattice metal-organic framework

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Nano Research 2024年第4期17卷 3407-3412页

作者： Sihua feng Chao Wang Jiyin Zhao Xuguang liu Chaocheng liu Zeming Qi Lei Chen Huijuan Wang Minghui Fan Hengli Duan Wensheng yan National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026China school of Materials science and Engineering Hefei University of TechnologyHefei 230009China Experimental Center of Engineering and Material science University of Science and Technology of ChinaHefei 230026China

Discovering more and new geometrically frustrated systems remains an active point of inquiry in fundamental physics for the existence of unusual states of ***,we report spin-liquid-like behavior in a two-dimensional(2.)rhombic lattice Fe-metal-organic framework(Fe-MOF)with frustrated *** Fe-MOF exhibits a high frustration factor f=|θCW|/TN≥315,and its long-range magnetic order is suppressed down to 180 *** theoretical calculations demonstrate strong antiferromagnetic coupling between adjacent Fe3+ions,indicating the potential of a classical spin-liquid-like ***,a T-linear heat capacity parameter,γ,originating from electronic contributions and with magnetic field independence up to 8 T,can be observed in the specific heat capacity measurements at low-temperature,providing further proof for the spin-liquid-like *** work highlights the potential of MOF materials in geometrically frustrated systems,and will promote the research of exotic quantum physics phenomena.

关键词： spin-liquid-like state two-dimensional metal-organic framework(2. MOF) rhombic lattice ultralow temperature(ULT)measurements spin-frustrated

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Finite Temperature Magnetism in the Triangular Lattice Antiferromagnet KErTe_(2.

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Chinese Physics Letters 2024年第9期41卷 140-150页

作者： Weiwei liu Zheng Zhang Dayu yan Jianshu {2. Zhitao Zhang Jianting Ji feng Jin Youguo Shi Qingming Zhang Department of Physics Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China school of Physical science and {2. Lanzhou UniversityLanzhou 730000China

After the discovery of the ARECh2.A=alkali or monovalent ions,RE=rare-earth,Ch=chalcogen)triangular lattice quantum spin liquid(QSL)family,a series of its oxide,sulfide,and selenide counterparts has been consistently reported and extensively *** KErTe_(2. represents the initial synthesized telluride member,preserving its triangular spin lattice,it was anticipated that the substantial tellurium ions could impart more pronounced magnetic attributes and {2. structures to this material *** study delves into the magnetism of KErTe_(2. at finite temperatures through magnetization and electron spin resonance(ESR)*** on the angular momentum J after spin-orbit coupling(SOC)and symmetry analysis,we obtain the magnetic effective Hamiltonian to describe the magnetism of Er^(3+)in R3m space *** the mean-field approximation to the Hamiltonian,we can simulate the magnetization and magnetic heat capacity of KErTe_(2. in paramagnetic state and determine the crystalline electric field(CEF)parameters and partial exchange *** relatively narrow energy gaps between the CEF ground state and excited states exert a significant influence on the *** example,small CEF excitations can result in a significant broadening of the ESR linewidth at 2.*** the fitted exchange interactions,although the values are small,given a large angular momentum J=15/2.after SOC,they still have a noticeable effect at finite ***,the heat capacity data under different magnetic fields along the𝑐axis direction also roughly match our calculated results,further validating the reliability of our analytical *** derived parameters serve as crucial tools for future investigations into the ground state magnetism of KErTe_(2..The findings presented herein lay a foundation for exploration of the intricate magnetism within the triangular-lattice delafossite family.

关键词： triangular Hamiltonian magnetization

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A lithium–tin fluoride anode enabled by ionic/electronic conductive paths for garnet-based solid-state lithium metal batteries

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Rare Metals 2024年第2期43卷 575-587页

作者： Lei Zhang Qian-Kun Meng Xiang-Ping feng Ming Shen Yu-Qing Zhang Quan-Chao Zhuang Run-Guo Zheng Zhi-Yuan Wang yan-Hua Cui Hong-Yu Sun yan-Guo liu school of Materials science and Engineering Northeastern UniversityShenyang110819China school of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao066004China school of Materials and Physics China University of Mining&TechnologyXuzhou221116China Institute of electronic Engineering China Academy of Engineering PhysicsMianyang621900China

The high energy density and stability of solid-state lithium metal batteries(SSLMBs)have garnered great ***-type oxides,especially li_(6.4)La_(3)Zr_(1.4)Ta_(0.6.O_(12)(LLZTO),with high ionic conductivity,wide electrochemical window,and stability to li metal anode,are promising solid-state electrolyte(SSEs)materials for ***,li/LLZTO interface issues including high interface resistance,inhomogeneous li deposition,and li dendrite growth have hindered the practical application of ***,a multi-functional li–SnF_(2) composite anode with li,liF,and li-Sn alloy was specifically designed and *** composite anode improves the wettability to LLZTO,constructing an intimate contact interface between it and ***,ionic/{16. conductive paths in situ formed at the interface can effectively uniform li deposition and suppress li *** solid-state symmetric cell exhibits low interface resistance(11Ω·cm^(2)) and high critical current density(1.3 mA·cm^(−2))at 25℃.The full SSLMB based on lifePO_(4) or liNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode also shows stable cycling performance and high rate *** work provides a new composite anode strategy for achieving high-energy density and high-safety SSLMBs.

关键词： Solid-state lithium metal batteries(SSLMBs) lithium-tin fluoride anode Ionic/electronic conductive Interface resistance lithium dendrite

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Phase engineering of Ni-Mn binary layered oxide cathodes for sodiumion batteries

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Journal of Energy Chemistry 2024年第4期91卷 501-511页

作者： Feifei Hong Xin Zhou Xiaohong liu Guilin {2. Heng Zhang Wei{2. Fan Bin Zhang Meihua Zuo Wangyan Xing Ping Zhang Hua yan Wei Xiang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059SichuanChina College of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina Research Institute for electronic science(RIES)and Division of Information science and technology Graduate School of Information Science and TechnologyHokkaido UniversityN20W10SapporoHokkaido 001-0020Japan school of Materials science and Engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina Yibin libode New Materials Co. Ltd.Yibin 644200SichuanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina

Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional *** composite materials with various phase structures of P3,P2.P3,P2.P2.O3,and P2.P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.2.)Mn_(0.75)O_(2.(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2.P2.P3,P2.03,and P2.P3/O3-Na_(x)Ni_(0.2.)Mn_(0.75)O_(2..Among them,P2.P3-Na0.75Ni0.2.Mn0.75O2.xhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.6.0}mA h g^(-1)at 0.1 C and a capacity retention rate of 78.2.%after 100 cycles at 1 C in the voltage range of 2.4.3 *** observed superior sodium storage performance of P2.P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2.and P3 *** systematic research and exploration of phases in Na_(x)Ni_(0.2.)Mn_(0.75)O_(2.provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.

关键词： Phase engineering Ni-Mn layered oxide Cathode Sodium-ion batteries

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Temperature-induced dissociation reaction and dynamics of light-harvesting complex II isolated from purple photosynthetic bacterium ***

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Chinese science Bulletin 2007年第8期52卷 1029-1035页

作者： feng juan li {2. liu Yuan school of life {2. and technology University of Electronic Science & Technology of China Chengdu 610054 China

Steady-state absorption spectroscopy,circular dichroism,and resonance Raman spectroscopy have been used to investigate the thermal stability of LH2.complex isolated from purple photosynthetic bacterium *** results show that:1)upon increasing the temperature,a transition from B800 and B850 to free bacteriochlorophyll(B780)happens;2.a gradual decrease and disappearance of CD signal in visible region occur;3)a shift of the frequency,belonging to C==C and C—C stretching vibration,to higher wavenumber takes *** is suggested that LH2.complex can be dissociated in the presence of B800,B850 and carotenoids ***-exponential fitting on the dynamic decay curves gives the apparent time constants of hundreds of minutes for various pigments.

关键词：紫色光合细菌沼泽红假单胞菌温度诱导离解反应反应动力学捕光配合物Ⅱ

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The In-Flight Realtime Trigger and Localization Software of GECAM

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Research in Astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： Xiao-Yun Zhao Shao-lin Xiong Xiang-yang Wen Xin-Qiao li Ce Cai Shuo Xiao Qi Luo Wen-Xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-Yuan liao yan-Qiu Zhang Yue Huang Lu li Xing Wen Fei Zhang Jing Duan Chen-Wei Wang Dong-li Shi Peng Zhang Qi-Bin Yi Chao-yang li yan-Bing Xu Xiao-Hua liang Ya-Qing liu Da-li Zhang Xi-Lei Sun Fan Zhang Gang Chen Huan-Yu Wang Sheng yang Xiao-Jing liu Min Gao Mao-Shun li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong liu Xing-Bo Han Jin-ling Qi Jia Huang Ke-Ke Zhang Can Chen Xiong-Tao yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang Ma Xiao-Bo li Ping Wang Xin-Ying Song li-Ming Song Shi-Jie Zheng Bing li Hong-Mei Zhang Yue Zhu Wei Chen Jian-Jian He Zhen Zhang Jin Hou Hong-Jun Wang yan-Chao Hao Xiang-Yu Wang Zong-Yuan yang Zhi-Long Wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan yan-Guo li Gang li Xu-Fang li Fang-Jun Lu Hong Lu Bin Meng feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei yang Xue-juan yang Shuang-Nan Zhang Chao-Yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of sciences Chinese Academy of SciencesBeijing 100049China school of Information science and {2. Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and Space science College China West Normal UniversityNanchong 637002China Department of Astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun University of science and technology Changchun 130022China Chinese Academy of sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2.2. December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM {2. *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

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中国太阳能富集区居住建筑光储系统设计方法研究

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太阳能学报 2024年第7期45卷 101-110页

作者：许馨尹冯珩力杨柳刘衍西安建筑科技大学建筑学院西安710055 苏州科技大学电子与信息工程学院苏州215009 绿色建筑全国重点实验室西安710055

以太阳能富集区居住建筑光储系统为研究对象,提出该能源系统的多目标优化设计方法。首先建立系统各设备动态模型,并以系统年化费用和建筑自持化率为优化目标,以全年逐小时供-储-需能流平衡、设备性能为约束,光伏安装倾角、方位角、容量... 详细信息

以太阳能富集区居住建筑光储系统为研究对象,提出该能源系统的多目标优化设计方法。首先建立系统各设备动态模型,并以系统年化费用和建筑自持化率为优化目标,以全年逐小时供-储-需能流平衡、设备性能为约束,光伏安装倾角、方位角、容量以及储能电池容量为决策变量,并利用非支配排序遗传算法(NSGA-Ⅱ)结合TOPSIS方法评估不同情景下的系统最优方案,最后以拉萨单层居住建筑为案例分析验证所提方法的可行性。结果表明:该方法可得到建筑自持化率和经济性双重目标下的光储系统关键参数,且余电是否上网交易会对能源系统设计产生重要影响。

关键词：太阳能电池储能优化设计 NSGA-Ⅱ算法 TOPSIS

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Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

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National science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu Jang Shuaifei Guo Ya-Jun yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai liu Dong-Lai {2. Xianhui Chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences school of Physical science and {2. ShanghaiTech University Korea Institute for Advanced Study school of Emerging technology and Department of Physics University of Science and Technology of China Advanced light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2.hat defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

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Localization effect in single crystal of RuAs2

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Chinese Physics B 2024年第4期33卷 620-625页

作者：易哲铠刘琪光双魁徐升岳小宇梁慧李娜周颖吴丹丹孙燕李秋菊程鹏夏天龙孙学峰王义炎 Anhui Key Laboratory of Magnetic Functional Materials and Devices Institute of Physical Science and Information TechnologyAnhui University Department of Physics and Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS) University of Science and Technology of China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China school of Optical and electronic Information Suzhou City University school of Physics and Optoelectronic Engineering Anhui University Collaborative Innovation Center of Advanced Microstructures Nanjing University

We report the magnetotransport and thermal properties of RuAs2.ingle crystal. RuAs2.xhibits semiconductor behavior and localization effect. The crossover from normal state to diffusive transport in the weak localization（WL） state and then to variable range hopping（VRH） transport in the strong localization state has been observed. The transitions can be reflected in the measurement of resistivity and Seebeck coefficient. Negative magnetoresistance（NMR） emerges with the appearance of localization effect and is gradually suppressed in high magnetic field. The temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to VRH. The measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization effect. Our findings show that RuAs2.s a suitable platform to study the localized state.

关键词： weak localization variable range hopping RuAs_2.single crystal

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