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“Steric Armor”Strategy of Blue Fluorescent Emitters against Photooxidation-Induced Degradation

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Chinese Journal of Chemistry 2024年第11期42卷 1223-1229页

作者： Sha-Sha Wang Jing-Rui Zhang Kuan-De Wang hao-Ran Li Peng-hui Meng Yang Zhou Xiang Yu Ying Wei Quan-You Feng Yu-he kan Ling-hai Xie Centre for Molecular Systems and Organic Devices(CMSOD) State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&TelecommunicationsNanjingJiangsu210023 China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuai'anJiangsu223300 China

Stability against oxygen is an important factor affecting the performance of organic semiconductor *** photooxidation stability can prolong the service life of the device and maintain the mechanical and photoelectric properties of the ***,various encapsulation methods from molecular structure to macroscopic device level are used to improve photooxidation ***,we adopted a crystallization strategy to allow 14h-spiro[dibenzo[c,h]acridine-7,9′-fluorene](SFDBA)to pack tightly to resist fluorescence decay caused by *** this case,the inert group of SFDBA acts as a“steric armor”,protecting the photosensitive group from being attacked by ***,compared with the fluorescence quenching of SFDBA powder under 2 h of sunlight,SFDBA crystal can maintain its fluorescence emission for more than 8 h under the same ***,the photoluminescence quantum yields(PLQYs)of the crystalline film is 327%higher than that of the amorphous *** shows that the crystallization strategy is an effective method to resist oxidation.

关键词： Organic semiconductor Photooxidation Spirocyclic aromatic hydrocarbons Crystal engineering Fluorescence

水生态文明城市建设试点政策对绿色水资源利用效率的影响

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长江流域资源与环境 2024年第3期33卷 498-509页

作者：阚大学吕连菊南昌工程学院经济贸易学院江西南昌330099 南昌工程学院水经济与管理研究中心江西南昌330099

如何提高绿色水资源利用效率对于中国在新发展阶段下实现全面绿色转型至关重要。基于2008~2020年中国城市面板数据,利用EBM模型计算发现样本期内绿色水资源利用效率一直呈现上升趋势,其中试点建设期的上升速度最快。进一步利用双重差分... 详细信息

如何提高绿色水资源利用效率对于中国在新发展阶段下实现全面绿色转型至关重要。基于2008~2020年中国城市面板数据,利用EBM模型计算发现样本期内绿色水资源利用效率一直呈现上升趋势,其中试点建设期的上升速度最快。进一步利用双重差分法实证研究水生态文明城市建设试点政策对绿色水资源利用效率的影响,结果表明在纳入城镇化水平、人口密度、对外开放水平和用水结构等控制变量下,水生态文明城市建设试点政策提高了绿色水资源利用效率,该结果通过了一系列稳健性检验。异质性方面,该试点政策对绿色水资源利用效率的影响存在时间异质性,且该影响在不同经济发展水平、水资源禀赋、环境规制强度的城市存在地区异质性。机制分析发现,该试点政策是通过加大污水处理、促进技术进步、优化产业结构、加快水价改革、推动水循环利用等提高了绿色水资源利用效率。

关键词：水生态文明绿色水资源利用效率双重差分法异质性

Novel synthesis of stabilized Bi_(1-x-y)Gd_xDy_yO_(1.5) solid electrolytes with enhanced conductivity for intermediate temperature solid oxide fuel cells(SOFCs)

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Journal of Rare Earths 2024年第10期42卷 1903-1911页

作者： Ahmed h.Ibrahim Yehia M.Abbas h.A.Ayoub Marwa h.Ali Mustafa Aldoori Materials Science Laboratory Physics DepartmentFaculty of ScienceSuez Canal University41522IsmailiaEgypt Ministry of higher Education and Scientific Research Aliraqia University10011BaghdadIraq

herein,we report the synthesis of a Dy-Gd co-doped cubic phase-stabilized Bi_(2)O_(3) solid electrolyte system via solid-state processing under atmospheric *** with Dy^(3+) and Gd^(3+) has been observed to significantly enhance the densification process during sintering for stabilization purposes,thereby improving the electrical properties of δ-Bi_2O_(3)-type *** synthesized ceramics were characterized using X-ray diffraction(XRD),field emission scanning electron microscopy-energy dispersive X-ray spectroscopy(FESEM-EDX),thermal gravimetry/differential thermal analysis(TG/DTA),and the four-point probe technique(4PPT).XRD analysis reveals that the samples Bi_(1-x-y)Gd_(x)Dy_(y)O_(1.5)(y=0.05/x=0.05,0.10,0,15,and 0.20,and x=0.05/y=0.10,0.15,and 0.20) exhibit a stable face-centered cubic δ-phase and a mixed-phase crystallographic *** XRD analysis of the stabilized δ-phase suggests that the prepared oxides show a face-centered cubic(FCC) structure with a space group of *** micrographs reveal that the composition Bi_(0.90)Gd_(0.05)Dy_(0.05)O_(1.5) has no significant ***,an evident increase in the pore formation is observed as the amount of Gd_(2O_(3) increases until it reaches 20%.This finding suggests that dense pellets are formed during the sintering process at 900-1000℃.The DTA analyses were performed to verify the phase stability,which agrees with the XRD *** electrochemical performance of the synthesized Dy-Gd co-doped Bi_2O_(3)solid electrolyte system was evaluated and analyzed in detail by using the electrochemical impedance spectroscopy(EIS) technique,Based on EIS and conductivity measurements,Bi_(0.75)Gd_(0.20)Dy_(0.05)O_(1.5) exhibits the lowest activation energy of 0.519 eV and the highest conductivity value of 0.398 S/cm at 627℃compared to the other samples;this composition can be used as a solid electrolyte for intermediatetemperature solid oxide fuel cells(SOFCs).

关键词： Solid oxide fuel cells(SOFCs) Rare earths Solid-state processing Rietveld Fast Fourier transform(FFT) Electrochemical impedance spectroscopy(EIS)

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基于基准剂量方法的动物替代策略及其应用

中国药理学与毒理学杂志 2024年第10期38卷 783-786页

作者：邵侃 Department of Environmental and Occupational health School of Public Health-BloomingtonIndiana UniversityBloomingtonIN 47405USA

剂量-反应评估作为风险评估中的关键定量步骤,其作用是确定安全剂量水平。与传统最大无害剂量方法相比,基准剂量(BMD)法促进了3R原则(减少、替代和优化)在毒理试验中的使用。本文综述了BMD法特性,包括对研究设计的依赖性较小、在起始点... 详细信息

剂量-反应评估作为风险评估中的关键定量步骤,其作用是确定安全剂量水平。与传统最大无害剂量方法相比,基准剂量(BMD)法促进了3R原则(减少、替代和优化)在毒理试验中的使用。本文综述了BMD法特性,包括对研究设计的依赖性较小、在起始点中更好地量化不确定性及整合额外信息能力等;总结了BMD法基于剂量-反应评估和数据整合在减少动物使用方面的作用。

关键词：基准剂量方法 3R原则剂量-反应建模替代毒理学

冲突与协同:大学学术治理的价值意蕴与路向选择

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教育理论与实践 2024年第12期44卷 3-7页

作者：阚萍首都师范大学教育学院北京100048

大学是知识生产与创新、人才培养与培育的重要场所,学术性是大学的基本特性,在学术层面引入治理理论是教育治理理论的深化。当前大学存在过于追求效率、学术委员会运行不畅、学术治理内恰性有待提升等问题,原因在于大学学术治理的价值... 详细信息

大学是知识生产与创新、人才培养与培育的重要场所,学术性是大学的基本特性,在学术层面引入治理理论是教育治理理论的深化。当前大学存在过于追求效率、学术委员会运行不畅、学术治理内恰性有待提升等问题,原因在于大学学术治理的价值追求片面化、内部缺乏权力制衡机制以及传统的组织架构加剧了学术资源竞争。从治理理论出发,大学学术治理的逻辑起点应该是治理价值的回归,即要复位到对学术自由的保障与追求;大学学术治理的根本保障在于大学内部不同权力的协同,共同形塑良好的大学内部权力运作样态;大学学术治理的基本方向是构建学术共同体,做强以学术委员会为代表的学术治理体系,以学术共同体推动形成协同有效的治理局面,最终形成以“善治”为特征的大学学术场域。

关键词：大学学术治理学术权力学术委员会学术共同体学术场域

ZnO-ITO/WO_(3-x)heterojunction structured memristor for optoelectronic co-modulation neuromorphic computation

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Science China Materials 2024年第9期67卷 2838-2847页

作者： Jianyong Pan Tong Wu Wenhao Yang Yang Li Jiaqi Zhang hao kan Shandong Provincial Key Laboratory of Network Based Intelligent Computing School of Information Science and EngineeringUniversity of JinanJinan250022China School of Integrated Circuits Shandong UniversityJinan250101China Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and EngineeringJilin UniversityChangchun130012China

Traditional transistors confront severe challenges of insufficient computing capability and excessive power consumption in large-scale neuromorphic *** address these critical bottlenecks,we propose an optoelectronic memristor based on zinc oxide-indium tin oxide/tungsten oxide(ZnO-ITO/WO_(3-x))heterojunctions as a promising *** applying different types of electrical and optical signals,the device successfully emulates diverse synaptic functions including short-term/long-term synaptic plasticity,alongside short-term and long-term *** the ZnO-ITO functional layer enhances the photoresponse of the WO_(3-x)-based memristor and demonstrates“learning-forgetting-relearning”behavior under optical ***,based on the photoelectric cooperative memristor array,a convolutional neural network for vehicle type recognition is constructed,which solves the problem of zero weight and negative weight *** regard to energy efficiency,the neural network built with this device operates at a power level of only 10^(-3)W,representing a reduction of more than 4 orders of magnitude compared with a standard central ***,the photoelectric memristor proposed in this work provides a new idea for neuromorphic computing and is expected to promote the development of energy-efficient brain-like computing.

关键词： ZnO-ITO/WO_(3-x)heterojunction optoelectronic memristor synaptic plasticity neuromorphic computing convolutional neural network

Shell-model representations of the microscopic version of the Bohr-Mottelson collective model

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Communications in Theoretical Physics 2024年第8期76卷 79-90页

作者： h G Ganev Joint Institute for Nuclear Research DubnaRussia Institute of Mechanics Bulgarian Academy of SciencesSofiaBulgaria

The structure of the irreducible collective spaces of the group Sp(12,R),which many-particle nuclear states are classified according to the chain Sp(12,R)⊃U(6)⊃SO(6)⊃SU_(pn)(3)⊗SO(2)⊃SO(3)of the proton-neutron symplectic model(PNSM),is considered in *** chain of the PNSM was recently shown to correspond to a microscopic shell-model version of the Bohr-Mottelson collective *** construction of the relevant shell-model representations of the Sp(12,R)group along this chain is considered for three nuclei with varying collective properties and from different mass *** is shown that the SU_(pn)(3)basis states of the Sp(12,R)representations belonging to the SO(6)irreps with seniorityυ≥υ0,withυ0 denoting the maximal seniority SO(6)irrep contained in the Sp(12,R)bandhead,are always Pauli allowed,but organized in a different way into different SO(6)*** is in contrast to the case of filling the levels of the standard three-dimensional harmonic oscillator and using the plethysm *** the SU_(pn)(3)multiplets withinυhe present work are important for the practical application of the microscopic version of the Bohr-Mottelson collective model.

关键词： microscopic shell-model version of the Bohr-Mottelson model proton-neutron symplectic model Sp(12,R)dynamical algebra shell-model representations

Convexification of hybrid AC-DC Optimal Power Flow with Line-Commutated Converters

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 617-628页

作者： hongyuan Liang Zhigang Li J.h.Zheng Q.h.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Line-commutated converter (LCC)-based high-voltage DC (hVDC) systems have been integrated with bulk AC power grids for interregional transmission of renewable power. The nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of hybrid AC-DC power grids. A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed. We devise an equivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with its proof. Equivalence of the proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.

关键词： AC-DC power system convex relaxation linecommutated converter optimal power flow second-order cone programming

Research on the longitudinal protection of a through-type cophase traction direct power supply system based on the empirical wavelet transform

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Global Energy Interconnection 2024年第2期7卷 206-216页

作者： Lu Li Zeduan Zhang Wang Cai Qikang Zhuang Guihong Bi Jian Deng Shilong Chen Xiaorui kan Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500P.R.China Brunel University London London UB83PHUnited Kingdom Yunnan Power Grid Co. Ltd.Kunming 650041P.R.China

This paper proposes a longitudinal protection scheme utilizing empirical wavelet transform(EWT)for a through-type cophase traction direct power supply system,where both sides of a traction network line exhibit a distinctive boundary *** approach capitalizes on the boundary’s capacity to attenuate the high-frequency component of fault signals,resulting in a variation in the high-frequency transient energy ratio when faults occur inside or outside the *** internal line faults,the high-frequency transient energy at the checkpoints located at both ends surpasses that of its neighboring ***,for faults external to the line,the energy is lower compared to adjacent *** is employed to decompose the collected fault current signals,allowing access to the high-frequency transient *** longitudinal protection for the traction network line is established based on disparities between both ends of the traction network line and the high-frequency transient energy on either side of the ***,simulation verification through experimental results demonstrates the effectiveness of the proposed protection scheme across various initial fault angles,distances to faults,and fault transition resistances.

关键词： Through-type Cophase traction direct power supply system Traction network Empirical wavelet transform(EWT) Longitudinal protection