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MOF-Derived Iron-Cobalt Phosphide Nanoframe as Bifunctional Electrocatalysts for Overall Water Splitting

Energy & Environmental Materials 2024年第6期7卷 312-320页

作者： Yanqi Yuan Kun Wang Boan Zhong Dongkun Yu fei Ye Jing liu Joydeep Dutta Peng Zhang School of Materials Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Functional NanoMaterials Group Department of Applied PhysicsSchool of Engineering SciencesKTH Royal Institute of TechnologyHannes Alfv´ens v¨ag 1211419StockholmSweden Shanghai Key Laboratory of Hydrogen Science Shanghai 200240China

Transition metal phosphides(TMPs)have emerged as an alternative to precious metals as efficient and low-cost catalysts for water *** doping and morphology control are effective approaches to further improve the performance of ***,fe-doped CoP nanoframes(fe-CoP NFs)with specific open cage configuration were designed and *** unique nano-framework structured fe-CoP material shows overpotentials of only 255 and 122 mV at 10 mA cm^(−2)for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER),respectively,overwhelming most transition metal *** overall water splitting,the cell voltage is 1.65 V for fe-CoP NFs at a current density of 10 mA cm^(−2),much superior to what is observed for the classical nanocubic ***-CoP NFs show no activity degradation up to 100 h which contrasts sharply with the rapidly decaying performance of noble metal catalyst *** superior electrocatalytic performance of fe-CoP NFs due to abundant accessible active sites,reduced kinetic energy barrier,and preferable*O-containing intermediate adsorption is demonstrated through experimental observations and theoretical *** findings could provide a potential method for the preparation of multifunctional material with hollow structures and offer more hopeful prospects for obtaining efficient earth-abundant catalysts for water splitting.

关键词： electrocatalysis hollow structure iron-doped cobalt phosphide MOF overall water splitting

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进口预旋下三种典型迷宫密封转子动力特性研究

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润滑与密封 2024年第6期49卷 185-194页

作者：向松莹刘理均王偲臣江苏大学流体机械工程技术研究中心江苏镇江212013 中国科学院工程热物理研究所北京100191

为探讨考虑进口预旋的迷宫密封转子动力特性,基于Murphy小位移涡动理论建立气流激振力与转子涡动位移的控制方程,采用用户自定义函数建立多频椭圆涡动模型,利用FLUENT动网格技术数值求解直通齿式迷宫密封(SLS)、倾斜齿式迷宫密封(ILS)... 详细信息

为探讨考虑进口预旋的迷宫密封转子动力特性,基于Murphy小位移涡动理论建立气流激振力与转子涡动位移的控制方程,采用用户自定义函数建立多频椭圆涡动模型,利用FLUENT动网格技术数值求解直通齿式迷宫密封(SLS)、倾斜齿式迷宫密封(ILS)和阶梯式迷宫密封(STLS)在不同预旋比下的激振力,通过快速傅里叶变换得到整机运行时的密封动力特性系数,并对转子稳定性和密封的泄漏量进行分析。结果表明:在40~180 Hz涡动频率范围内3种密封结构的直接刚度系数呈先减小后增大的趋势,表现出很强的频率相关性,而密封结构与进口预旋对阻尼系数的影响可以忽略;阻尼系数随涡动频率增加缓慢减小至负值并趋于平稳,其中STLS的阻尼系数最小,稳定性最差,ILS的稳定性最好;增加进口预旋比会降低有效阻尼系数,并导致泄漏量降低;STLS在不同预旋条件下的密封性能均最佳,相比于SLS与ILS的泄漏量分别减少了15%和7%;在研究的20~200 Hz涡动频率范围内3种类型迷宫密封的交叉刚度由负值增大为正值,而有效阻尼减小为负值,此时迷宫密封转子系统稳定较差,可能会诱发转子失稳。

关键词：进口预旋迷宫密封气流激振动力特性有效阻尼

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收入水平与碳生产率空间差异“同向而行”的机制研究——兼论产业转移的中介效应

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生态经济 2024年第10期40卷 29-38,66页

作者：刘晓燕孙慧向仙虹新疆历史文化旅游可持续发展重点实验室新疆乌鲁木齐830046 新疆大学旅游学院新疆乌鲁木齐830046 新疆创新管理研究中心新疆乌鲁木齐830046 新疆大学经济与管理学院新疆乌鲁木齐830046

论文将收入水平、产业转移和碳生产率纳入统一框架体系,探讨2001-2019年30个省份收入水平对碳生产率的空间效应及产业转移的中介效应。结果表明:(1)收入水平和碳生产率的区域差距总体有所减缓,但依然较大;缩小“高-低”收入组间和“高-... 详细信息

论文将收入水平、产业转移和碳生产率纳入统一框架体系,探讨2001-2019年30个省份收入水平对碳生产率的空间效应及产业转移的中介效应。结果表明:(1)收入水平和碳生产率的区域差距总体有所减缓,但依然较大;缩小“高-低”收入组间和“高-低”碳生产率组间差距是推动区域平衡发展的关键所在。(2)提升“高收入”和碳生产率“高效区”的收入,能促进碳生产率提高,推动劳动密集型产业外移;提升“低收入”和碳生产率“低效区”的收入,相对劳动力成本优势依然存在,有利于促进产业迁入,但迁入产业对能源的高度依赖性,反而抑制了碳生产率提高。(3)收入差距缩小产生的技术创新效应,对碳生产率的提升效应推动了整体区域碳生产率的平衡发展。总之,加大“低收入”区收入水平,引导劳动密集型和低技术密集型产业向碳生产率“低效区”转移是实现“双赢”目标的重要路径。

关键词：收入水平产业转移碳生产率

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Preparation of vanadium-based electrode materials and their research progress in solid-state flexible supercapacitors

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Rare Metals 2024年第2期43卷 431-454页

作者： Rui-Jie Zhu Jiang liu Chao Hua Hao-Yu Pan Yi-Jun Cao Meng Li Zhongyuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou450001China School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Solid-state flexible supercapacitors(SCs)have many advantages of high specific capacitance,excellent flexibility,fast charging and discharging,high power density,environmental friendliness,high safety,light weight,ductility,and long cycle *** are the ideal choice for the development of flexible energy storage technology in the future,and provide a good prospect for energy storage *** present,solid-state flexible SCs are widely used for portable electronic equipment and wearable energy storage equipment,the research of them has become the focus of a growing number of *** material is the key part of SCs and always determines the electrochemical performance of *** has been a hotspot and focus of ***-based compounds are considered to be a promising electrode material for SCs because of variable valence,open structure,high theoretical capacity,and low ***,this study first gives an overview of solid-state flexible SCs,then reviews the current research status of vanadium-based electrode materials in solid-state flexible SCs,and proposes some strategies to solve some problems of vanadium-based electrode materials.

关键词： Vanadium-based materials Flexible energy storage Specific capacitance Supercapacitors(SCs)

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随机激励下斜拉索-梁参数振动模型及响应分析

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应用力学学报 2024年第5期41卷 1129-1139页

作者：汪峰向泓嘉刘章军三峡大学防灾减灾湖北省重点实验室宜昌443002 三峡大学土木与建筑学院宜昌443002 武汉工程大学土木工程与建筑学院武汉430074

为了揭示随机激励下斜拉索参数振动特性,考虑拉索几何非线性、倾角以及桥面梁的协同振动影响,建立了斜拉索-桥面梁耦合参数振动模型,利用相空间变换推导了索-梁结构耦合振动伊藤状态方程组,给出了高斯白噪声作用下索梁振动时程求解迭代... 详细信息

为了揭示随机激励下斜拉索参数振动特性,考虑拉索几何非线性、倾角以及桥面梁的协同振动影响,建立了斜拉索-桥面梁耦合参数振动模型,利用相空间变换推导了索-梁结构耦合振动伊藤状态方程组,给出了高斯白噪声作用下索梁振动时程求解迭代格式,分析了拉索随机响应时程、频域、统计特性以及概率密度变化,并与高斯截断方法进行比较,考察了拉索阻尼比、初始张力、桥面梁的初始扰动以及随机激励强度对拉索振动的影响规律。结果表明:斜拉索振动迭代方法可有效求解随机激励下索-梁耦合参数振动时程,与传统的高斯截断方法的计算结果吻合;随机激励下,斜拉索“拍振”振幅具有明显的不确定性,斜拉索与桥面梁结构发生耦合振动时,两者之间存在能量传递现象;斜拉索随机激励位移响应均值具有非平稳瞬态特性,其位移均方差的稳定时间大于理想激励下的响应;斜拉索响应功率峰值对应的频率和功率谱密度旁瓣峰值衰减量基本一致,但斜拉索第一旁瓣峰值与主峰差值并不相同。斜拉索振动响应概率密度分布满足高斯分布形态,置信区间约为0.98,符合马尔科夫性质。随着阻尼比增大,拉索阻尼抑制效率降低;桥面梁初始扰动越大,拉索振动位移越大;拉索张力越大,拉索振动幅值呈非线性减小趋势,但张力进一步增大时,拉索振动幅值衰减趋于稳定;随机激励强度越大,拉索响应越大。

关键词：斜拉索随机激励耦合模型参数振动响应分析

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全流程药学服务在心血管内科FM35病组患者药品成本管控中的效果分析

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中国药房 2024年第17期35卷 2136-2141页

作者：曹文静张鹏肖灿刘湘湘潭市中心医院临床药学科湖南湘潭411100 湘潭市中心医院院前急救科湖南湘潭411100

目的运用全流程药学服务优化心血管内科FM35病组患者药物治疗方案,实现保障患者用药安全并管控住院药品费用的目标。方法以2023年7-8月在我院心血管内科治疗出院的213例FM35病组患者为对照组,筛选其全部医嘱并运用复杂网络分析法及我院... 详细信息

目的运用全流程药学服务优化心血管内科FM35病组患者药物治疗方案,实现保障患者用药安全并管控住院药品费用的目标。方法以2023年7-8月在我院心血管内科治疗出院的213例FM35病组患者为对照组,筛选其全部医嘱并运用复杂网络分析法及我院药物评价标准制定优化治疗药物库。以2023年9月我院心血管内科新收治入院的83例FM35病组患者为干预组,建立并应用政策宣讲-治疗方案干预的模式,对该组患者进行全流程药学服务。对比两组患者的治疗费用、住院日及出院转归情况。结果通过临床药师全流程药学服务,与对照组比较,干预组患者住院总费用、药品费用、药占比、疾病诊断相关分组(DRG)费用超标病例比例均显著下降(P<0.05),住院日中位数缩短1 d;两组患者的出院转归好转率均≥99%。结论临床药师通过全流程药学服务可在保证医疗质量的基础上有效提升医疗服务效率,节约医疗成本,有效助力DRG的顺利施行。

关键词：全流程药学服务疾病诊断相关分组临床药师药品成本管控复杂网络分析法驻科服务

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Lead-free(Ba,Sr)TiO_(3)-based ceramics with superior tunable properties by the semi-solution method

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Journal of Advanced Ceramics 2024年第6期13卷 746-756页

作者： Yi Zhao Wenfeng liu Dongsheng Ran Yihang Jin Zhiyuan Li Chengzhi Zhong Fanyi Kong Shengtao Li State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China Jiaxing Electric Power Company State Grid Zhejiang Electric Power Co. Ltd.Jiaxing 314000China

High-performance dielectric tunable materials with both high dielectric tunability and low dielectric loss are urgently needed for new-generation electronic tunable *** the present study,a new system,(Ba_(0.675)Sr_(0.325))_(1−x)La_(x)Ti_(1−x)MnxO_(3)(x=0.25%,0.5%,0.75%,and 1.0%),was *** acceptor dopant Mn was added to lower dielectric loss,while the donor dopant La was introduced to enhance dielectric *** samples were prepared using the conventional solid-state(CS)reaction method and the semi-solution(SS)*** experimental results showed that the morphology of the ceramics was optimized by further improving the processing *** microstructures,homogeneous grains,and uniform dopant distributions could be achieved successfully by the semi-solution ***,a significant enhancement in the tunable properties was realized owing to the improved microstructure mentioned *** optimum tunable properties occurred in the samples prepared by the semi-solution method at x=0.75%,with a high dielectric tunability of 85.0%,a low dielectric loss of 0.0011,and an excellent figure of merit(FOM)of *** tunable properties of(Ba,Sr)TiO_(3)(BST)ceramics were even superior to those of lead-based materials,with an FOM of approximately *** the results suggested that the semi-solution method rendered BST ceramics more promising for applications in tunable devices.

关键词： microstructure tunable properties (Ba,Sr)TiO_(3)(BST)ceramics semi-solution(SS)method

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Improvement of the piezoelectricity of PVDF-HFP by Cofe_(2)O_(4)nanoparticles

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Nano Materials Science 2024年第2期6卷 201-210页

作者： Dan Lei Ning Hu Liangke Wu Alamusi Huiming Ning Yang Wang Zhaonan Jin Yaolu liu College of Aerospace Engineering Chongqing UniversityChongqing400044China State Key Laboratory of Reliability and Intelligence Electrical Equipment School of Mechanical EngineeringHebei University of TechnologyTianjin300401China

High piezoelectric composite films composed of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)and ferromagnetic cobalt ferrite(Cofe_(2)O_(4))(0.00 wt%to 0.2 wt%)are prepared by a solution casting method accompanied by uniaxial stretching and high electric field *** decisive effect of the poling electric field on the power generating capability was confirmed by the *** pure PVDF-HFP films,when the maximum electric field Emax is 120 MV/m,the calibrated open circuit voltage reaches 2.93 V,which is much higher than those poled at lower electric fields(70 MV/m:1.41 V;90 MV/m:2.11 V).Furthermore,the addition of Cofe_(2)O_(4)also influences the piezoelectricity *** the samples containing 0.15 wt%Cofe_(2)O_(4),the calibrated open circuit voltage increases to the maximum value of 3.57 ***,the relative fraction of theβ-phase and the crystallinity degree are 99%and 48%,*** effects of Cofe_(2)O_(4)nanoparticles on initial crystallization,uniaxial stretching and high electric field poling are investigated by XRD,FTIR and DSC.

关键词： PVDF-HFP Cofe_(2)O_(4)nanoparticles Piezoelectricity Nanocomposite

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Early fire detection technology based on improved transformers in aircraft cargo compartments

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Journal of Safety Science and Resilience 2024年第2期5卷 194-203页

作者： Hongzhou Ai Dong Han Xinzhi Wang Quanyi liu Yue Wang Mengyue Li Pei Zhu College of Civil Aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan618307China CivilAircraf Fire Science and Safety Enginring Key Laboratory of Sichuan CivilAviation Flight University of ChinaGuanghan 618307China School of Computer Engineering and Science Shanghai UniversityShanghai 200444China Key Laboratory of Civil Aviation Emergency Science&Technology Nanjing University of Aeronautics and AstronauticsNanjing 210000China

The implementation of early and accurate detection of aircraft cargo compartment fire is of great significance to ensure flight *** current airborne fire detection technology mostly relies on single-parameter smoke detection using infrared *** often results in a high false alarm rate in complex air transportation *** traditional deep learning model struggles to effectively address the issue of long-term dependency in multivariate fire *** paper proposes a multi-technology collaborative fire detection method based on an improved transformers ***-wavelength optical sensors,flue gas analyzers,and other equipment are used to carry out multi-technology collaborative detection methods and characterize various feature dimensions of fire to improve detection *** improved Transformer model which integrates the self-attention mechanism and position encoding mechanism is applied to the problem of long-time series modeling of fire information from a global perspective,which effectively solves the problem of gradient disappearance and gradient explosion in traditional RNN(recurrent neural network)and CNN(convolutional neural network).Two different multi-head self-attention mechanisms are used to classify and model multivariate fire information,respectively,which solves the problem of confusing time series modeling and classification modeling in dealing with multivariate classification tasks by a single attention ***,the output results of the two models are fused through the gate *** research results show that,compared with the traditional single-feature detection technology,the multi-technology collaborative fire detection method can better capture fire *** with the traditional deep learning model,the multivariate fire pre-diction model constructed by the improved Transformer can better detect fires,and the accuracy rate is 0.995.

关键词： Deep learning Aircraft cargo compartment Attentionmechanism Firedetection Multi-sourcedata fusion

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Electrostatic interaction-mediated 1:1 complexes for high-contrast mitochondrial-targeted phosphorescence bioimaging

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Science China Chemistry 2024年第10期67卷 3406-3413页

作者： Jianshuo Cheng Hao Sun Lulu Zhou Glib VBaryshnikov Mouwei liu Shen Shen Hans Ågren Liangliang Zhu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China Laboratory of Organic Electronics Department of Science and TechnologyLinköping UniversityNorrköping 60174Sweden Department of Physics and Astronomy Uppsala UniversityUppsala SE-75120Sweden

Organelle-targeted imaging can provide information on cellular functions and intracellular interactions,being significant for disease *** use of room-temperature phosphorescence(RTP)in organelle-targeted imaging can fully utilize its unique characteristics of long wavelength and deep ***,this technology has long been plagued by insufficient probe targeting and limited luminous *** this work,we prepared a series of complexes composed of multicationic persulfurated arenes and biomacromolecules via electrostatic interactions in 1:1 stoichiometry for high-contrast mitochondrial-targeted RTP *** an electrostatic interaction design effectively prevented the self-aggregation of the probes,which is not conducive to mitochondrial ***,it suppressed the non-radiative decay to the maximum extent,enabling the probes to exhibit strong RTP signals both in aqueous solution and at the cellular ***,the biomacromolecules can serve as carriers for an electrostatic interaction transfer of the persulfurated arenes to *** leads to high mitochondrial targeting Pearson's correlation coefficients of the probes and high-contrast RTP imaging effects,as well as the independence of the co-incubated probe *** results provide new insights for the development of targeted imaging technologies.

关键词： room-temperature phosphorescence mitochondrial targeting bioimaging complex electrostatic interaction

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