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35 kV高压直挂大容量电池储能系统

高电压技术 2024年第2期50卷 881-892,I0034-I0036页

作者：刘畅吴胜兵吴西奇姜新宇李睿蔡旭上海交通大学电气工程系电力传输与功率变换控制教育部重点实验室上海200240 广州智光储能科技有限公司广州510760

为推动35 kV高压直挂电池储能系统(battery energy storage system,BEss)的实际应用,系统研究了35 kV高压直挂BEss的主电路参数设计、控制策略及相关控制参数的设计方法;并在MATlAB/simulink中搭建了35 kV/10 MW/10 MWh系统的仿真模型,... 详细信息

为推动35 kV高压直挂电池储能系统(battery energy storage system,BEss)的实际应用,系统研究了35 kV高压直挂BEss的主电路参数设计、控制策略及相关控制参数的设计方法;并在MATlAB/simulink中搭建了35 kV/10 MW/10 MWh系统的仿真模型,以验证所提设计方法及控制策略的正确性。研究结果表明:35 kV高压直挂BEss单机容量大,功率响应速度快,可对内部电池簇进行主动荷电状态均衡及故障冗余控制,系统效率和可靠性更高,能适应未来新能源大规模发展需求。

关键词：电池储能系统单机大容量高压直挂储能变换器参数设计控制策略荷电状态均衡

Rapid growth in a large Cambrian apex predator

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National science Review 2024年第3期11卷 128-136页

作者：吴雨 stephen Pates Daniel Pauly 张兴亮傅东静 state Key laboratory of Continental Dynamics and shaanxi Key laboratory of Early life and Environment Department of Geology Northwest University Department of Zoology University of Cambridge Institute for the Oceans and Fisheries University of British Columbia Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences

Despite the importance of ontogenetic data on early diverging euarthropods to our understanding of the ecology and evolution of past life, the data are distinctly lacking, as reconstructing life histories of fossil animals is often challenging. Here we report the growth trajectory of frontal appendages of the apex predator Amplectobelua symbrachiata, one of the most common radiodont arthropods from the early Cambrian Chengjiang biota(c. 520 Ma) of China. Analysis of 432 specimens(9.1–137.1 mm length; 1.3–25.6 mm height) reveals that appendages grew isometrically, with an estimated maximum size of the whole animal of c. 90 cm. Individuals grew rapidly compared to extant arthropods, as assessed using the electronic length-frequency analysis(ElEFAN) approach. Therefore, we show that the Cambrian apex predator A. symbrachiata was an extremely fast-growing arthropod, with an unusual life history strategy that formed as part of the escalatory ‘arms race’ that shaped the Cambrian explosion over 500 Ma.

关键词： stem-group Euarthropoda Radiodonta post-embryonic development growth dynamics Cambrian Explosion

Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO_(2) capture

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Frontiers of Chemical science and Engineering 2024年第1期18卷 37-49页

作者： Yuke Zhang Hongxue Xu Haonan wu lijuan shi Jiancheng Wang Qun Yi state Key laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China school of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

CO_(2) capture is one of the key technologies for dealing with the global warming and implementing lowcarbon development *** emergence of ionic metal-organic frameworks(I-MOFs)has diversified the field of porous materials,which have been extensively applied for gas adsorption and *** this work,amino-functionalized imidazolium ionic liquid as organic monodentate ligand was used for one step synthesis microporous Cu based *** tuning of the adsorption properties was obtained by incorporating aromatic anions,such as phenoxy,benzene carboxyl,and benzene sulfonic acid group into the I-MOFs via a facile ion exchange *** new I-MOFs showed high thermal stability and high capacity of 5.4 mmol·g^(-1) under atmospheric conditions for selective adsorption of CO_(2).The active sites of microporous Cu-MOF are the ion basic center and unsaturated metal,and electrostatic attraction and hydroxyl bonding between CO_(2) and modified functional sulfonic groups are responsible for the *** work provides a feasible strategy for the design of I-MOF for functional gas capture.

关键词： carbon dioxide capture micropores ionic liquids multi-site synergism ionic metal-organic frameworks

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南海岛礁珊瑚砂砾混合料动力特性试验研究

岩土工程学报 2024年第1期46卷 63-71页

作者：吴杨吴毅航马林建崔杰刘建坤戴北冰广州大学土木工程学院广东广州510006 中山大学土木工程学院广东广州510275 陆军工程大学国防工程学院江苏南京210007

在南海岛礁实际建造工程中,上部吹填地基材料以大小砂砾共存、混杂无序的状态分布。地层中砂砾混合分布状态使地基在地震等动荷载下呈现出复杂的力学响应。通过开展一系列不同含砾量、密实度、围压和初始剪应力条件下的不排水循环三轴... 详细信息

在南海岛礁实际建造工程中,上部吹填地基材料以大小砂砾共存、混杂无序的状态分布。地层中砂砾混合分布状态使地基在地震等动荷载下呈现出复杂的力学响应。通过开展一系列不同含砾量、密实度、围压和初始剪应力条件下的不排水循环三轴剪切试验,研究珊瑚砂砾混合料在不同工况下的动力特性。试验结果表明,无论是在松散还是密实状态,含有珊瑚砾的混合料试样在循环荷载下表现出更缓的轴向应变增长和孔隙水压上升的变化趋势。与单一珊瑚砂所构成的试样相比,珊瑚砂砾料试样具有更高的抗液化能力。珊瑚砂砾混合料抗液化强度随着含砾量、密实度和初始剪应力的增大而显著提高。密实珊瑚砂砾料的抗液化强度随围压的增大而减小,而针对松散试样没有发现明显规律,这可能是围压和密实度耦合影响引起的。试验结果表明含砾量对试样抗液化强度的影响主要受混合料骨架结构所控制,混合料骨架大致可分为粗颗粒(珊瑚砾)和细颗粒(珊瑚砂)结构主导两种状态。二元介质属性是开展砂砾混合料力学特性研究所必须考虑的影响因素。

关键词：珊瑚砂砾混合料动力特性含砾量骨架结构

Cryo-EM structure of cannabinoid receptor CB1-β-arrestincomplex

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Protein & Cell 2024年第3期15卷 230-234页

作者： Yuxia Wang lijie wu Tian Wang Junlin liu Fei li longquan Jiang Zhongbo Fan Yanan Yu Na Chen Qianqian sun Qiwen Tan Tian Hua Zhi-Jie liu iHuman Institute ShanghaiTech UniversityShanghai 201210China school of life science and Technology ShanghaiTech UniversityShanghai 201210China Institute of Molecular and Clinical Medicine Kunming Medical UniversityKunming 650500China

Dear Editor,G protein-coupled receptors(GPCRs)play a vital role in regulating almost every aspect of human physiology,making up more than one-third of marketed drug targets(santos et al.,2017).GPCRs orchestrate their signalling through interactions with three distinct downstream protein families:G proteins,G protein-coupled receptor kinases(GRKs),and arrestins(santos et al.,2017).While G protein-mediated signalling is initiated upon GPCR stimulation,activated GPCRs return to their basal levels through a GRK-and arrestin-regulated desensitization process(santos et al.,2017).In addition to modulating receptor desensitization,β-arrestin also regulates downstream events that are distinct from classical G protein signalling(Ahn et al.,2020).

关键词： stimulation return

live-streaming selling strategies for competitive firms

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中国科学技术大学学报 2024年第5期54卷 22-35,I0006,I0007页

作者： Quan Du Zhixin Chen Jie wu Xiang Ji school of Management University of Science and Technology of ChinaHefei 230026China

The booming live-streaming commerce has significantly changed the traditional e-commerce model,thus attracting much attention from both industry and *** recent years,an increasing number of scholars have applied analytical models to explore live-streaming strategies for firms in different ***,the previous literature mainly considers monopolists,while in the real world,competition is not *** fill this gap between the literature and practical observations,this paper applies a game theoretical model to study live-streaming adoption and pricing strategy for firms under competitive *** results show that,for competitive firms,the equilibrium strategy depends on the relation between the commission rate and the intensity of the market expansion ***,compared to the case in which no firm adopts live-streaming,competitive firms do not always benefit from the adoption of live-streaming *** paper also shows that competition plays a negative role in inducing a firm to adopt live-streaming.

关键词： live-streaming commerce live-streaming strategy game competition

HOG-VGG:VGG Network with HOG Feature Fusion for High-Precision PolsAR Terrain Classification

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Journal of Harbin Institute of Technology(New series) 2024年第5期31卷 1-15页

作者： Jiewen li Zhicheng Zhao Yanlan wu Jiaqiu Ai Jun shi school of Computer science and Information Engineering Hefei University of TechnologyHefei 230009China Information Materials and Intelligent sensing laboratory of Anhui Province Anhui UniversityHefei 230601China school of Artificial Intelligence Anhui UniversityHefei 230601China Intelligent Interconnected systems laboratory of Anhui Province(Hefei University of Technology) Hefei 230009China school of software Hefei University of TechnologyHefei 230009China

This article proposes a VGG network with histogram of oriented gradient(HOG) feature fusion(HOG-VGG) for polarization synthetic aperture radar(PolsAR) image terrain ***-Net has a strong ability of deep feature extraction,which can fully extract the global deep features of different terrains in PolsAR images,so it is widely used in PolsAR terrain ***,VGG-Net ignores the local edge & shape features,resulting in incomplete feature representation of the PolsAR terrains,as a consequence,the terrain classification accuracy is not *** fact,edge and shape features play an important role in PolsAR terrain *** solve this problem,a new VGG network with HOG feature fusion was specifically proposed for high-precision PolsAR terrain ***-VGG extracts both the global deep semantic features and the local edge & shape features of the PolsAR terrains,so the terrain feature representation completeness is greatly ***,HOG-VGG optimally fuses the global deep features and the local edge & shape features to achieve the best classification *** superiority of HOG-VGG is verified on the Flevoland,san Francisco and Oberpfaffenhofen *** show that the proposed HOG-VGG achieves much better PolsAR terrain classification performance,with overall accuracies of 97.54%,94.63%,and 96.07%,respectively.

关键词： PolsAR terrain classification high⁃precision HOG⁃VGG feature representation completeness elevation multi⁃level feature fusion

Elucidating elusive quaternary selenide EuCeCuse3:synthesis,crystal structure,properties and theoretical studies

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Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim s.Molokeev Vladimir A.Chernyshev Aleksandr s.Aleksandrovsky Alexander s.Krylov svetlana N.Krylova Nikolai P.shestakov Dmitriy A.Velikanov Alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas schleid Damir A.safin laboratory of Theory and Optimization of Chemical and Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation Department of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation Department of Photonics and laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany scientific and Educational and Innovation Center for Chemical and Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuse3,the fabrication of which has been a challenge until this *** structure of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuse3with excellent yield(96.7%)accompanied with a minor fraction of Cese2(3.3%),and was best solved in orthorhombic space group Pnma with the BalaCus3structural ***,the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuse3(RE=la,Pr,Nd,sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,lu,Y),of which the cerium-based derivative exclusively belongs to the BalaCus3structural *** distortion of the Cuse4polyhedron was compared for the whole series of EuRECuse3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the la3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides srCeCus3and *** initio calculations of the crystal structure,a phonon spectrum and elastic constants for the crystal of EuCeCuse3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuse3was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstrates the anisotropy of the elastic properties,while the Vickers hardness for EuCeCuse3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide synthesis Crystal structure Ab initio calculations Magnetic measurements spectroscopy

典型高原湖泊人类活动净氮磷输入时空变化及其影响因素——以云南星云湖为例

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湖泊科学 2024年第4期36卷 1110-1120,I0016,I0017页

作者：白姣杰孟岑李裕元吴大付王帅兵孙占东吴庆龙吴金水河南科技学院资源与环境学院新乡453000 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室长沙410125 中国科学院大学北京100049 玉溪师范学院化学生物与环境学院玉溪653100 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008

星云湖作为人类农业生产活动影响下环境问题突出的代表性高原湖泊,其水体健康与生态平衡对于区域可持续发展至关重要。因此,量化解析星云湖流域人类活动净氮磷输入时空来源变化及影响因素对于流域管理和湖泊恢复具有重要意义。基于社会... 详细信息

星云湖作为人类农业生产活动影响下环境问题突出的代表性高原湖泊,其水体健康与生态平衡对于区域可持续发展至关重要。因此,量化解析星云湖流域人类活动净氮磷输入时空来源变化及影响因素对于流域管理和湖泊恢复具有重要意义。基于社会经济统计数据,采用人类活动净氮输入(NANI)、人类活动净磷输入(NAPI)模型量化星云湖流域NANI、NAPI强度。结果表明,19892020年研究区NANI、NAPI均值分别为(14614±2196)和(3135±452)kg/(km^(2)·a),时间上呈现先上升后下降的变化趋势,且峰值出现在2015年,分别达到18076和3889 kg/(km^(2)·a);空间分布上,除东部NANI、NAPI较低外,其余区域均较高;化肥和食物/饲料输入分别是NANI和NAPI的最大来源,占比分别为58.2%~63.8%和30.5%~59.5%。此外,基于模型选择和变量重要性分析发现,经济作物产量和畜禽密度是影响NANI、NAPI变化的最主要因素。因此,星云湖流域氮磷管控应从调整种植结构和模式等控源措施入手,加快经济模式转型。本研究结果可为星云湖流域建立有效的氮磷综合管理措施提供科学依据。

关键词：人类活动净氮输入人类活动净磷输入高原湖泊星云湖乡镇尺度农业活动影响