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Phosphorus-doped NiS;electrocatalyst with a hybrid structure for hydrogen evolution

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Science China Technological Sciences 2022年

作者： ZHOU Qi LIU HaoRui JIAO SunZhi FENG ChenChen State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology College of Mechanical Engineering Longdong University

In this article, P-NiS;/Ni;P electrocatalysts were synthesized by dealloying the Ni-Al precursor followed by phosphosulfide treatment. We found that the hybrid structure of P-NiS;/Ni;P provides rich active sites for the surface hydrogen evolution reaction（HER）, and the doping of P enhances the electronic conductivity of electrodes. In particular, the obtained electrode shows a low overpotential of 196 mVat 10 mA cm;and a small Tafel slope of only 110 mV dec;in the HER. Meanwhile, longterm constant current electrolysis test experiments indicate that P-NiS;/Ni;P has good service stability. This research will help to open a new window on the design and fabrication of HER electrocatalysts.

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Preparation and Pseudo-capacitance Performance of NiCo2O4 Nanosheets

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Chemical Research in Chinese Universities 2019年第6期35卷 957-961页

作者： ZHOU Qi JIAO SunZhi ZHENG Bin LI Zhiyang School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050P.R.China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals^Lanzhou University of Technology Lanzhou 730050P.R.China

Ternary nickel cobaltite(NiCo2O4),as a promising electrode material for supercapacitors,has attracted increasing attention for its excellent electrochemical properties.In this study,novel NiCo2O4 nanosheets were rationally designed and prepared using dealloying process,followed by an oxidation treatment.The as-prepared sample was characterized by microstructural and electrochemical techniques in view of its possible application in supercapacitors.The as-prepared sample exhibited high specific capacitance and excellent durability.The specific capacitance reached 663 F/g at 1 A/g and the rate capacitance high up to 73.6%when the current density increased from 1 A/g to 20 A/g.After 5000 cycles of galvanostatic charge-discharge durability test at 4 A/g,the capacity retention rate was 82.1%.The results indicate that versatile dealloying can be used to prepare robust electrode for supercapacitor application.

关键词： Rapid-solidification Dealloying Nickel cobaltate Nanosheet Pseudo-capacitance

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Mg-Zn系合金半固态组织研究进展

信息记录材料 2021年第5期22卷 7-8页

作者：杨剑桥焦孙治李晨机械科学研究总院青岛分院有限公司山东青岛266300

镁合金的成形方式及热处理工艺是研究Mg-Zn系合金的重要方向。文章概述了近几年Mg-Zn系合金的研究进展,阐述了由等温重熔法制备的半固态组织具备的特征。总结分析了合金元素、保温时长及温度对Mg-Zn系合金非枝晶组织的影响规律,以期为开... 详细信息

镁合金的成形方式及热处理工艺是研究Mg-Zn系合金的重要方向。文章概述了近几年Mg-Zn系合金的研究进展,阐述了由等温重熔法制备的半固态组织具备的特征。总结分析了合金元素、保温时长及温度对Mg-Zn系合金非枝晶组织的影响规律,以期为开发Mg-Zn系合金的半固态触变成形提供理论参考。

关键词： Mg-Zn系合金合金元素等温热处理工艺

联结方式对大功率行星减速器行星架静力学特性的影响

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机械工程师 2021年第10期 22-25,28页

作者：魏伟米振涛杨剑桥焦孙治机械科学研究总院青岛分院有限公司山东青岛266300

为掌握大功率行星减速器双侧板行星架静力学参数在不同联结方式下的特征规律,以某型号大功率行星减速器输出双侧板行星架为研究对象,基于有限元分析理论,建立不同联结方式下的双侧板行星架有限元分析模型,分析了不同联结方式对双侧板行... 详细信息

为掌握大功率行星减速器双侧板行星架静力学参数在不同联结方式下的特征规律,以某型号大功率行星减速器输出双侧板行星架为研究对象,基于有限元分析理论,建立不同联结方式下的双侧板行星架有限元分析模型,分析了不同联结方式对双侧板行星架静力学特性的影响规律。研究结果表明:联结方式对大功率行星减速器双侧板行星架的静力学特性影响较小,3种联结方式下行星架的应力及位移变形量均满足强度和刚度条件,3种联结方式下的双侧板行星架均具有稳定的可靠性和寿命。上述研究为行星架的设计研发及加工工艺制定提供了理论依据,在缩短行星架加工制造周期和成本、提高行星架加工制造质量和可靠性、延长其使用寿命等方面具有重要意义。

关键词：双侧板行星架有限元分析应力位移

Monge–Ampère Type Equations on Almost Hermitian Manifolds

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Acta Mathematica Sinica,English Series 2023年第5期39卷 749-772页

作者： jiao Gen ZHANG School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026P.R.China

In this paper we consider the Monge–Ampère type equations on compact almost Hermitian manifolds.We derive C∞a priori estimates under the existence of an admissible C-subsolution.Finally,we obtain an existence resul... 详细信息

关键词： Monge-Ampere type equations almost Hermitian manifold a priori estimates subsolution

Effects of mask wearing duration and relative humidity on thermal perception in the summer outdoor built environment

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建筑模拟(英文) 2023年第9期16卷 1601-1616页

作者： Rong Hu Jianlin Liu Yongxin Xie jiao jiao Zhaosong Fang Borong Lin College of Environmental Science and Engineering Donghua UniversityShanghaiChina Department of Building Science School of ArchitectureTsinghua UniversityBeijingChina School of Civil Engineering Guangzhou UniversityGuangzhouChina Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

During the pandemic,face masks are one of the most significant self-protection necessities,but they also cause heat stress.By using the ERA5(ECMWF Reanalysis 5th Generation)database and the local weather bureau data,the effect of mask wearing on outdoor thermal sensation has been investigated by a survey conducted in the hot summer and cold winter region of eastern China in the summer of 2020.Results show that wearing a face mask for a longer period result in a higher level of discomfort,and the primary source of discomfort is hot and stuffy feelings.The effect of relative humidity is crucial for mask wearers in warm-biased thermal environments,as mean thermal sensation vote(TSV)peaks when environmental relative humidity reaches the range of 70%to 80%and decreases after this range due to the evaporation within the microclimate created by a face mask.Meanwhile,prolonged mask wearing increases participants’hot feelings,especially in warm environments.Specifically,participants wearing face masks for less than 30 min feel hot at a physiological equivalent temperature(PET)value of 34.4℃,but those who wear them for over 60 min express hot feelings even at a PET value of 24.7℃.The participants who wear a face mask while walking slowly outdoors have similar thermal sensations to those who do not wear a mask,but are in a higher activity level.The findings demonstrate that mask wearing has a crucial impact on outdoor thermal comfort assessment in a warm-biased outdoor thermal environment.

关键词： outdoor thermal comfort disposable medical masks mask wearing duration relative humidity physiological equivalent temperature(PET)

Time-varying output feedback H∞control for switched systems based on mixed switching

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Journal of Control and Decision 2022年第3期9卷 364-371页

作者： jiao Li College of Science Dalian Minzu UniversityDalianPeople’s Republic of China

This article investigates time-varying dynamic output feedbackH∞control problem for discretetime switched systems by using a time-varying Lyapunov function.Aswitching rule that depends on available information provided by measured output and time simultaneously is designed for the system with all unstable subsystems.Conditions for l2-gain performance and time-varying controller synthesis are obtained under this switching rule.It provides a more general framework of analyzing discrete-time switched linear systems as it contains the min-switching as special cases when dwell time is not enforced.Finally,an example shows the effectiveness of the proposed method.

关键词： Switched systems switching rule mixed switching time-varying output feedback H∞control

Tolerance Limits Under Gamma Mixtures:Application in Hydrology

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Journal of Systems Science & Complexity 2023年第3期36卷 1285-1301页

作者： jiao Junjun CHENG Weihu Faculty of Science Beijing University of TechnologyBeijing 100124China

In this study,the authors proposed upper tolerance limits for the gamma mixture distribution based on generalized fiducial inference,and an MCMC simulation is performed to sample from the generalized fiducial distributions.The simulation results and a real hydrological data example show that the proposed tolerance limits are more efficient.

关键词： Gamma mixture distribution generalized fiducial inference incomplete data latent variable Markov chain Monte Carlo

Removal of competing bacteria in coral microbiome through“trojan virus”:A newly discovered mechanism of coral pathogenicity

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Science China Earth Sciences 2023年第8期66卷 1906-1908页

作者： Nianzhi jiao Fujian Key Laboratory of Marine Carbon Sequestration Carbon Neutral Innovation Research CenterCollege of Ocean and Earth Sciences and State Key Laboratory of Marine Environmental ScienceXiamen UniversityXiamen 361005China

Coral reefs are underwater ecosystems characterized by reefbuilding corals.These reefs are complex three-dimensional structures formed by colonies of coral polyps held together by calcium carbonate,and play an important role in the global carbon cycle(Kinsey and Hopley,1991).Although coral reefs cover only approximately 0.5% of the global sea floor,they serve various ecological functions,such as ecological resource restoration,environmental regulation。

关键词： coral carbonate Coral