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ESG评价分歧的信息效应——以分析师预测为例

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财经论丛 2024年第5期 71-81页

作者：肖翔林伟杰葛格李珍珠北京交通大学经济管理学院北京100044 北京交通大学中东欧研究中心北京100044

第三方机构的ESG评价结果为使用者提供企业的可持续发展信息,然而评价分歧的经济后果及其机制尚未形成共识。本文研究ESG评价分歧的信息效应,基于信息使用框架,从分析师角度出发,提出基于不确定性信息和异质性信息的两种对立机制,利用2... 详细信息

第三方机构的ESG评价结果为使用者提供企业的可持续发展信息,然而评价分歧的经济后果及其机制尚未形成共识。本文研究ESG评价分歧的信息效应,基于信息使用框架,从分析师角度出发,提出基于不确定性信息和异质性信息的两种对立机制,利用2017—2021年7家不同ESG评价机构的得分数据对上述机制进行验证。结果表明,ESG评价分歧会降低分析师预测误差,从而支持异质性信息的观点。研究还发现,ESG评价分歧通过反映企业每股收益和提高市场分析师整体预测质量来降低分析师预测误差。此外,ESG评价分歧能够为分析师提供信息不对称程度高企业的更多信息。在控制ESG得分均值的情况下,ESG评价分歧与ROA、ROE和个股回报率呈现正相关关系,进一步验证了信息效应。本文不仅以评价分歧的新视角补充了ESG相关文献,还阐明了ESG评价分歧的信息效应及其机制,为后续的高质量ESG评价提供了理论和实证支持。

关键词： ESG ESG分歧信息效应分析师

Movement of Dirac points and band gaps in graphyne under rotating strain

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Nano Research 2017年第6期10卷 2005-2020页

作者： zhenzhu li Zhongfan liu Zhirong liu College of Chemistry and Molecular Engineering Center for Nanochemistry State Key Laboratory for Structure Chemistry of Unstableand Stable Species and Beijing National Laboratory for Molecular Sciences (BNLMS) Peking University Beijing 100871 China

The introduction of lattice anisotropy causes Dirac cones to shift in response to the applied strain, leaving a pseudogap at the original Dirac points. Here, a group-theory analysis is combined with first-principles calculations to reveal the movement characteristics of Dirac points and band gaps in various graphynes under rotating uniaxial and shear strains. Graphene, where linear effects dominate, is different from α-,β-, and γ-graphynes, which generate strong nonlinear responses due to their bendable acetylenic linkages. However, the linear components of the electronic response, which are essential in determining material performance such as intrinsic carrier mobility due to electron-phonon coupling, can be readily separated, and are well described by a unified theory. The movement of the Dirac points in α-graphyne is circular under a rotating strain, and the pseudogap opening is isotropic with a magnitude of only 2% that in graphene. In comparison, the movement in β-graphyne is elliptical and the center is displaced from the origin. For γ-graphyne, three branches of gaps change with the applied strains with a sine/cosine dependence on the strain angle. The developed methodology is useful in determining the electronic response to various strains of Dirac materials and two-dimensional semiconductors,

关键词： graphene graphyne Dirac point band gap first-principles strain effect

Recent progress in Pb-free stable inorganic double halide perovskites

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Journal of Semiconductors 2018年第7期39卷 18-23页

作者： zhenzhu li Wanjian Yin Soochow Institute for Energy and Materials InnovationS(SIEMIS) College of Physics Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Soochow University

Although the power conversion efficiency（PCE） of CH3 NH3 PbI3-based solar cells has achieved 22.1%,which is comparable to commercialized thin-film CdTe and Cu（In,Ga）Se2 solar cells, the long-term stability is the main obstacle for the commercialization of perovskite solar cells. Recent efforts have been made to explore alternative inorganic perovskites, which were assumed to have better stability than organic-inorganic hybrid CH3 NH3 PbI3. In this short review, we will keep up with experiments and summarize recent progresses of inorganic double halide perovskite, in particular to Cs2 AgBiBr6, Cs2 AgInCl6, Cs2 InBiBr6 and their family members. We will also share our opinions on the promise of such class of materials.

关键词： double perovskite solar cell Pb-free

Nanostructured Bi2S3 encapsulated within three- dimensional N-doped graphene as active and flexible anodes for sodium-ion batteries

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Nano Research 2018年第9期11卷 4614-4626页

作者： Chen Lu zhenzhu li lianghao Yu li Zhang Zhou Xia Tao Jiang Wanjian Yin Shixue Dou Zhongfan liu Jingyu Sun Soochow Institute for Energy and Materials Innovations (SIEMIS) Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 China Institute for Superconducting and Electronic Materials University of Wollongong Wollongong NSW2522 Australia Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Sodium-ion batteries （SIBs） have been increasingly attracting attention as a sustainable alternative to lithium-ion batteries for scalable energy storage. The key to advanced SIBs relies heavily upon the development of reliable anodes. In this respect, Bi2S3 has been extensively investigated because of its high capacity, tailorable morpholog, and low cost However, the common practices of incorporating carbon species to enhance the electrical conductivity and accommodate the volume change of Bi2S3 anodes so as to boost their durability for Na storage have met with limited success. Herein, we report a simple method to realize the encapsulation of Bi2S3 nanorods within three-dimensional, nitrogen-doped graphene （3DNG） frameworks, targeting flexible and active composite anodes for SIBs. The Bi2S3/ 3DNG composites displayed outstanding Na storage behavior with a high reversible capacity （649 mAh·g^-1 at 62.5 mA·g^-1） and favorable durability （307 and 200 mAh·g^-1 after 100 cycles at 125 and 312.5 mA·g^-1, respectively）. In-depth characterization by in situ X-ray diffraction revealed that the intriguing Na storage process of Bi2Sa was based upon a reversible reaction. Furthermore, a full, flexible SIB cell with Na0.4MnO2 cathode and as-prepared composite anode was successfully assembled, and holds a great promise for next-generation, wearable energy storage applications.

关键词： sodium-ion batter,composite anode,bismuth sulfide,three-dimensional nitrogen-doped graphene,flexible

Bayesian optimization based on a unified figure of merit for accelerated materials screening:A case study of halide perovskites

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Science China Materials 2020年第6期63卷 1024-1035页

作者： Xiwen Chen Chen Wang zhenzhu li Zhufeng Hou Wan-Jian Yin College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)and Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou 215006China

The figure of merit is of crucial importance in materials design to search for candidates with optimal *** the field of photovoltaics,the bandgap(E_g)is a well-recognized figure of merit for screening solar cell absorbers subject to the Shockley-Queisser *** this paper,the bandgap as the figure of merit is challenged since an ideal solar cell absorber requires multiple criteria such as stability,optical absorption,and carrier *** criteria make the quantitative description of material candidates difficult and computationally *** halide perovskites as an example,we combine thermodynamic stability(ΔHd)and Eginto a unified figure of merit and use Bayesian optimization(BO)to accelerate materials *** have found that,in comparison to an exhaustive search via multiple parameters,BO based on the unified figure of merit can screen optimal candidates(E_g,PBEbetween 0.6–1.2 eV,ΔHd>-29 meV per atom)more ***,the proposed method opens a viable route for the search of optimal solar cell absorbers from a large amount of material candidates with less computational cost.

关键词： descriptor machine learning Bayesian optimization DFT calculations

Tunable Optical Rotation with an M-Type Atomic System Using Vortex Beam

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Journal of Applied Mathematics and Physics 2022年第4期10卷 1089-1097页

作者： zhenzhu li Department of Physics University of Shanghai for Science and Technology Shanghai China

We consider the optical rotation of the polarization of a linearly polarized probe field passing through an M-type atomic system by using the interaction between two vortex control fields and optical transitions. We investigate theoretically to generate the spatially dependent structured light with the atoms acting as a spatially varying circular birefringent medium. We show that the polarization and intensity distributions of the vector beam spatially vary by changing the orbital angular momentum (OAM) of the vortex control field.

关键词： Optical Rotation Vortex Beam Structured light

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漯河市天牛虫害发生规律及防控措施

河南林业科技 2024年第03期44卷 57-59页

作者：郭俊强陈国豪郭萌萌李珍珠漯河市林业事务服务中心漯河市园林绿化养护中心

天牛是园林植物的主要蛀干害虫之一，其危害严重且治理难度大。这种害虫分布广泛，能造成严重的损害，因此必须引起高度重视。近年来，漯河市积极探索防治天牛的方法，并根据其危害程度综合运用了人工、化学和生物等多种防治手段。通过... 详细信息

天牛是园林植物的主要蛀干害虫之一，其危害严重且治理难度大。这种害虫分布广泛，能造成严重的损害，因此必须引起高度重视。近年来，漯河市积极探索防治天牛的方法，并根据其危害程度综合运用了人工、化学和生物等多种防治手段。通过这些努力，掌握了天牛发生的基本规律，并对所采取的措施进行了分析。这些措施已经收到了明显的效果，并为科学防治提供了有价值的参考。

关键词：天牛综合防控漯河

Confining MOF-derived SnSe nanoplatelets in nitrogen-doped graphene cages via direct CVD for durable sodium ion storage

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Nano Research 2019年第12期12卷 3051-3058页

作者： Chen Lu zhenzhu li Zhou Xia Haina Ci Jingsheng Cai Yingze Song lianghao Yu Wanjian Yin Shixue Dou Jingyu Sun Zhongfan liu College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Beijing Graphene Institute(BGI) Beijing 100095China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia Center for Nanochemistry(CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Tin-based compounds are deemed as suitable anode candidates affording promising sodium-ion storages for rechargeable batteries andhybrid ***,synergistically tailoring the electrical conductivity and structural stability of tin-based anodes to attain durablesodium-ion storages remains challenging to date for its practical ***,metal-organic framework(MOF)derived SnSe/C wrappedwithin nitrogen-doped graphene(NG@SnSe/C)is designed targeting durable sodium-ion ***@SnSe/C possesses favorable electricalconductivity and structure stability due to the"inner"carbon framework from the MOF thermal treatment and"outer"graphitic cage from thedirect chemical vapor deposition ***,NG@SnSe/C electrode can obtain a high reversible capacity of 650 mAh·g^-1 at 0.05 A·g^1,a favorable rate performance of 287.8 mAh·g^1 at 5 A·g^1 and a superior cycle stability with a negligible capacity decay of 0.016%percycle over 3,200 cycles at 0.4 A·g^*** calculations reveal that the nitrogen-doping in graphene can stabilize the NG@SnSe/Cstructure and improve the electrical *** reversible Na-ion storage mechanism of SnSe is further investigated by in-situ X-raydiffraction/ex-s/tu transmission electron ***,assembled sodium-ion hybrid capacitor full-cells comprising our NG@SnSe/Canode and an active carbon cathode harvest a high energy/power density of 115.5 Wh·kg^-1/5,742 W·kg^-1,holding promise for next-generationen ergy storages.

关键词： SnSe nitrogervdoped graphene plasma-enhanced chemical vapor deposition conductivity sodium-ion storage

Differentiated self-assembly through orthogonal noncovalent interactions towards the synthesis of two-dimensional woven supramolecular polymers

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Chinese Chemical Letters 2024年第5期35卷 179-182页

作者： zhenzhu Wang Chenglong liu Yunpeng Ge Wencan li Chenyang Zhang Bing Yang Shizhong Mao Zeyuan Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China Center for Supramolecular Chemical Biology Jilin UniversityChangchun 130012China

Molecular weaving is a powerful approach to make molecularly woven materials that have showed unprecedented characteristics and properties intrinsically distinct to those of non-woven *** here report a facile and efficient approach for the synthesis of 2D woven supramolecular polymers by differentiated self-assembly through orthogonal noncovalent ***,the difference in binding strength of two orthogonal noncovalent interactions can be used to control the process of molecular ***,single-layered 2D woven supramolecular polymers were synthesized and fully characterized by various *** study demonstrates a controllable method for molecular weaving,and will significantly hasten the development of molecularly woven materials.

关键词： Differentiated self-assembly Double-stranded helix Molecular weaving Supramolecular chemistry Two-dimensional polymer