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Experimental and theoretical studies on two-dimensional vanadium carbide hybrid nanomaterials derived from V_(4)AlC_(3) as excellent catalyst for MgH_(2)

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Journal of Magnesium and Alloys 2023年第10期11卷 3790-3799页

作者： Zhiqiang Lan huiren Liang Xiaobin Wen jiayang hu hua Ning Liang Zeng Haizhen Liu Jun Tan Jürgen Eckert Jin Guo Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning 530004PR China College of mathematics and Physics Guangxi Minzu UniversityNanning 530006PR China College of Materials Science and Engineering Chongqing UniversityChongqing 400044PR China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department Materials Physics Montanuniversität LeobenJahnstraße 12Leoben A-8700Austria National University of Science and Technology«MISiS» LeninskyProsp.4Moscow 119049Russia

Hydrogen is considered one of the most ideal future energy *** safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen *** the current investigation,two-dimensional vanadium carbide(VC) was prepared by an etching method using V_(4)AlC_(3) as a precursor and then employed to enhance the hydrogen storage properties of MgH_(2).The studied results indicate that VC-doped MgH_(2) can absorb hydrogen at room temperature and release hydrogen at 170℃. Moreover,it absorbs 5.0 wt.%of H_(2) within 9.8 min at 100℃ and desorbs 5.0 wt.% of H_(2) within 3.2 min at 300℃.The dehydrogenation apparent activation energy of VC-doped MgH_(2) is 89.3 ± 2.8 kJ/mol,which is far lower than that of additive-free MgH_(2)(138.5 ± 2.4 kJ/mol),***-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break,which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms,thus,the hydrogen storage properties of MgH_(2) are remarkable improved through addition of VC.

关键词： MgH_2 Two-dimensional Hydrogen storage material Density functional theory

Core processing neuron-enabled circuit motifs for neuromorphic computing

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InfoMat 2023年第11期5卷 78-88页

作者： Hanxi Li jiayang hu Anzhe Chen Yishu Zhang Chenhao Wang Beiduo Wang Yi Tong Jiachao Zhou Kian Ping Loh Yang Xu Tawfique Hasan Bin Yu School of Micro-Nano Electronics Zhejiang UniversityHangzhouthe People's Republic of China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhouthe People's Republic of China School of Materials Science and Engineering Zhejiang UniversityHangzhouthe People's Republic of China Department of Polymer Science and Engineering Zhejiang UniversityHangzhouthe People's Republic of China Gusu Laboratory of Materials Suzhouthe People's Republic of China Department of Chemistry National University of SingaporeSingaporeSingapore Joint Institute of Zhejiang University and the University of Illinois at Urbana-Champaign Zhejiang UniversityHainingthe People's Republic of China Cambridge Graphene Centre Cambridge University Engineering DepartmentCambridgeUK

Based on brain-inspired computing frameworks,neuromorphic systems implement large-scale neural networks in *** rapid advances have been made in the development of artificial neurons and synapses in recent years,further research is beyond these individual components and focuses on neuronal circuit motifs with specialized excitatory-inhibitory(E-I)connectivity *** this study,we demonstrate a core processor that can be used to construct commonly used neuronal *** neuron,featuring an ultracompact physical configuration,integrates a volatile threshold switch with a gate-modulated two-dimensional(2D)MoS_(2) field-effect channel to process complex E-I spatiotemporal spiking ***,basic neuronal circuits are constructed for biorealistic neuromorphic *** practical applications,an algorithm-hardware co-design is implemented in a gatecontrolled spiking neural network with substantial performance improvement in human speech separation.

关键词： artificial intelligence hardware excitatory-inhibitory neurons neuronal circuit motifs speech separation spiking neural networks

数字能力对在华跨国公司数字创新绩效的影响机制——基于fsQCA的研究

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科技进步与对策 2024年第19期41卷 91-99页

作者：程聪胡嘉阳浙江工业大学中国中小企业研究院浙江工业大学管理学院浙江杭州310023

随着数字技术快速发展,数字能力成为影响跨国公司数字创新绩效的重要途径。为了探究数字能力对跨国公司数字创新绩效的影响机制,以40家在华跨国公司为例,基于动态能力理论分析框架,采用模糊集定性比较分析法探讨数字连接情境下在华跨国... 详细信息

随着数字技术快速发展,数字能力成为影响跨国公司数字创新绩效的重要途径。为了探究数字能力对跨国公司数字创新绩效的影响机制,以40家在华跨国公司为例,基于动态能力理论分析框架,采用模糊集定性比较分析法探讨数字连接情境下在华跨国公司数字创新绩效影响因素间的复杂关系,以及在华跨国公司数字创新绩效提升路径。结果显示,产品创新绩效很大程度上会受到数字连接能力与企业资源偏好的影响;流程创新绩效中,数字智能应用、数字资源投入与分配能够促进流程创新绩效提升。结论可拓展在华跨国公司数字创新绩效相关研究,为在华跨国公司提升创新绩效提供实践启示。

关键词：数字能力在华跨国公司数字创新绩效数字连接 fsQCA

基于五次NURBS曲线的六轴机器人多目标轨迹优化

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电子测量与仪器学报 2020年第6期32卷 198-203页

作者：胡嘉阳韦巍浙江大学电气工程学院杭州310027

为了提升机械臂工作的效率,提出了一种基于混合粒子群算法的轨迹规划优化方法,使用5次NURBS曲线为工作轨迹,利用混合粒子群算法,针对机械臂的脉动冲击、能量消耗和工作时间3个目标建立目标函数并获得帕累托最优解集,将权重目标函数归一... 详细信息

为了提升机械臂工作的效率,提出了一种基于混合粒子群算法的轨迹规划优化方法,使用5次NURBS曲线为工作轨迹,利用混合粒子群算法,针对机械臂的脉动冲击、能量消耗和工作时间3个目标建立目标函数并获得帕累托最优解集,将权重目标函数归一化从而得到期望解。在MATLAB环境下由这一方法建立模型进行仿真,并选取六轴机械臂进行仿真分析之后得出非支配解集,并选取最优解,证实了该轨迹规划方法可以有效的提升机械臂的运行效率,并且能够实现约束条件下的多目标优化。

关键词：多目标优化轨迹规划 5次NURBS曲线混合粒子群算法六轴机械臂

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氨制冷压力容器封头直边开裂原因分析

压力容器 2019年第2期36卷 65-71页

作者：熊从贵胡家扬林通台州龙江化工机械科技有限公司浙江温岭317500 台州市特种设备监督检验中心浙江台州318000

介绍了氨制冷压力容器使用过程中出现的封头直边开裂缺陷。通过对封头材料复验、表面硬度测试、应力腐蚀环境分析,指出了产生开裂失效的原因,并提出预防措施。

关键词：液氨制冷压力容器封头直边应力腐蚀开裂

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MEMS微波功率传感器等效电路模型的研究

仪器仪表学报 2018年第12期39卷 152-159页

作者：白雪婧胡加杨李龙飞王德波南京邮电大学电子与光学工程学院南京210046

为了提高热电式微机电系统(MEMS)微波功率传感器的灵敏度,需要对传感器的热电特性进行研究。首先根据热-电变量之间的等效关系建立了传感器的等效电路模型,利用该模型研究了不同的GaAs衬底厚度对负载电阻电-热转换能力的影响;接着建立... 详细信息

为了提高热电式微机电系统(MEMS)微波功率传感器的灵敏度,需要对传感器的热电特性进行研究。首先根据热-电变量之间的等效关系建立了传感器的等效电路模型,利用该模型研究了不同的GaAs衬底厚度对负载电阻电-热转换能力的影响;接着建立理论解析模型研究热传导、热对流、热辐射对不同衬底厚度的传感器的电-热转换能力的影响,推导出相应的负载电阻温度分布,验证了等效电路模型;最终,在等效电路模型的基础上建立灵敏度与噪声系数模型,综合考虑它们之间的制约关系,得到了使传感器综合性能最佳的衬底厚度设计区间。根据建立的等效电路模型,对特定衬底厚度下制备的热电式MEMS微波功率传感器进行实验测试,频率测量范围达到30 GHz,输入微波功率从1 mW增加至100 mW。该功率传感器结构的灵敏度分别为0.184 3 mV/mW@1 GHz、0.130 1 mV/mW@10 GHz、0.101 3 mV/mW@20 GHz、0.071 8 mV/mW@30 GHz,并且该结构具有较大的动态测试范围。

关键词：微波功率传感器等效电路温度分布理论模型灵敏度

基于参数自调节的电氢耦合系统调频控制策略研究

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高压电器 2024年第7期60卷 1-11页

作者：李建林胡笳扬辛迪熙曾飞袁晓冬北方工业大学国家能源用户侧储能创新研发中心北京100144 国网江苏省电力有限公司电力科学研究院南京211103

针对含质子交换膜燃料电池(proton exchange membrane fuel cell,PEMFC)的氢储能系统频率控制问题,为提高氢储能系统的频率稳定性,提出了一种基于虚拟参数自调节的系统频率控制策略。其中,电氢耦合系统以PEMFC为依托,光伏、储能电池为辅... 详细信息

针对含质子交换膜燃料电池(proton exchange membrane fuel cell,PEMFC)的氢储能系统频率控制问题,为提高氢储能系统的频率稳定性,提出了一种基于虚拟参数自调节的系统频率控制策略。其中,电氢耦合系统以PEMFC为依托,光伏、储能电池为辅助,通过PEMFC、光伏、储能电池三者混合向系统综合负荷供电。通过数学模型构建,观察出系统内发生微小扰动后,PEMFC及储能电池的动态响应变化,改变虚拟控制参数,调整系统内的功率分配。由于PEMFC和储能电池动态响应时间不同,对于PEMFC和储能电池采取不同的控制策略,具体体现为对PEMFC采取下垂控制,而对储能电池采取惯量控制,来达到维持系统内频率在正常范围内微小波动并趋于稳定的目的。最后,通过MATLAB/Simulink仿真平台搭建模型验证了所提策略的有效性和优越性。

关键词：质子交换膜燃料电池电氢耦合下垂控制惯量控制调频参数自调节储能电池光伏

Significant changes in the physicochemical properties of BC-containing particles during the cold season in Beijing

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Journal of Environmental Sciences 2025年第5期151卷 667-676页

作者： Shuya hu Linghan Zeng Gang Zhao Shiyi Chen Chunsheng Zhao Weilun Zhao Min hu State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Research Center for Atmospheric Research(IJRC)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science and TechnologyNanjing 210044China

The ambient air quality has improved significantly under strict emission controls in Beijing,China over the last *** carbon(BC),as a short-lived climate forcer in ambient aerosols,profoundly impacts the air quality and *** studies have demonstrated a decline in the mass concentration of *** this study,we characterized the chemical compositions and size distributions of BC-containing particles during the cold season of 2022 in Beijing using state-of-the-art instruments capable of exclusively measuring BCcontaining *** optical properties of BC-containing particles were further calculated based on the Mie ***,we compared the properties of BC-containing particles in 2022 with the results of previous *** results showed that the diameters of BC cores became larger while the coating thickness of BC-containing particles became thinner in *** the coating materials,the mass fraction of nitrate increased obviously,and even replaced organic matter as the dominant component during the peak of the pollution *** in chemical compositions and size distributions resulted in lower mass absorption cross-sections(MAC)of BC-containing particles from 10.5±1.1 m^(2)/g in 2016 to 7.3±0.8 m^(2)/g in 2022,reduced by 30.5%.Our results demonstrate the synergistic benefits of air pollution control in improving air quality and mitigating climate ***,the MAC of BC adopted in climate models should vary with the changing air pollution *** study emphasizes that it is imperative to conduct long-term observations of BC-containing particles to better estimate BC’s climate effects.

关键词： Black carbon Chemical composition Size distribution Light absorption ability

Degradation of carbamazepine by the UVA-LED_(365)/ClO_(2)/NaClO process:Kinetics,mechanisms and DBPs yield

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Journal of Environmental Sciences 2025年第2期148卷 399-408页

作者： Chenyan hu Yihui Wu Zhengyu Dong Ziyi Dong Shengjie Ji Lili hu Xinyu Yang Hao Liu College of Environmental and Chemical Engineering Shanghai Engineering Research Center of EnergySaving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

A mixed oxidant of chlorine dioxide(ClO_(2))and NaClO was often used in water treatment.A novel UVA-LED(_(365) nm)-activated mixed ClO_(2)/NaClO process was proposed for the degradation of micropollutants in this ***(CBZ)was selected as the target *** with the UVA_(365)/ClO_(2) process,the UVA_(365)/ClO_(2)/NaClO process can improve the degradation of CBZ,with the rate constant increasing from 2.11×10^(−4) sec^(−1) to 2.74×10^(−4) sec^(−1).In addition,the consumption of oxidants in the UVA_(365)/ClO_(2)/NaClO process(73.67%)can also be lower than that of UVA_(365)/NaClO(86.42%).When the NaClO ratio increased,both the degradation efficiency of CBZ and the consumption of oxidants can increase in the UVA_(365)/ClO_(2)/NaClO *** solution pH can affect the contribution of NaClO in the total oxidant *** the pH range of 6.0-8.0,the combination process can generate more active species to promote the degradation of *** change of active species with oxidant molar ratio was investigated in the UVA_(365)/ClO_(2)/NaClO *** ClO_(2) acted as the main oxidant,HO·and Cl·were the main active species,while when NaClO was the main oxidant,ClO·played a role in the *** chloride ion(Cl^(-)),bicarbonate ion(HCO_(3)^(-)),and nitrate ion(NO_(3)^(-))can promote the reaction *** the concentration of NaClO in the reaction solution increased,the generation of chlorates will *** UVA_(365)/ClO_(2)/NaClO process can effectively control the formation of volatile disinfection by-products(DBPs),and with the increase of ClO_(2) dosage,the formation of DBPs can also decrease.

关键词： UVA Chlorine dioxide(ClO_(2)) NaClO Carbamazepine(CBZ) Disinfection by-products