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2.4 V ultrahigh-voltage aqueous MXene-based asymmetric micro-supercapacitors with high volumetric energy density toward a self-sufficient integrated microsystem

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Fundamental Research 2024年第2期4卷 307-314页

作者： Yuanyuan Zhu Shuanghao Zheng Jieqiong qin jiaxin Ma Pratteek Das Feng Zhou Zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China College of Science Henan Agricultural UniversityZhengzhou 450002China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Two-dimensional MXenes are key high-capacitance electrode materials for micro-supercapacitors(MSCs)catering to integrated microsystems.However,the narrow electrochemical voltage windows of conventional aqueous electrolytes(≤1.23 V)and symmetric MXene MSCs(typically≤0.6 V)substantially limit their output voltage and energy density.Highly concentrated aqueous electrolytes exhibit lower water molecule activity,which inhibits water splitting and consequently widens the operating voltage window.Herein,we report ultrahigh-voltage aqueous planar asymmetric MSCs(AMSCs)based on a highly concentrated LiCl-gel quasi-solid-state electrolyte with MXene(Ti3C2Tx)as the negative electrode and MnO_(2) nanosheets as the positive electrode(MXene//MnO_(2)-AMSCs).The MXene//MnO_(2)-AMSCs exhibit a high voltage of up to 2.4 V,attaining an ultrahigh volumetric energy density of 53 mWh cm−3.Furthermore,the in-plane geometry and the quasi-solid-state electrolyte enabled excellent mechanical flexibility and performance uniformity in the serially/parallel connected packs of our AMSCs.Notably,the MXene//MnO_(2)-AMSC-based integrated microsystem,in conjunction with solar cells and consumer electronics,could efficiently realize simultaneous energy harvesting,storage,and conversion.The findings of this study provide insights for constructing high-voltage aqueous MXene-based AMSCs as safe and self-sufficient micropower sources in smart integrated microsystems.

关键词： Asymmetric micro-supercapacitors MXene MnO_(2) Aqueous electrolyte High voltage Integrated microsystem

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Numerical Simulation on Production Trials by Using Depressurization for Typical Marine Hydrate Reservoirs:Well Type and Formation Dip

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Journal of Ocean University of China 2024年第3期23卷 661-675页

作者： qin Fanfan SUN jiaxin GU Yuhang CAO Xinxin MAO Peixiao NING Fulong JIANG Guosheng National Center for International Research on Deep Earth Drilling and Resource Development Faculty of EngineeringChina University of GeosciencesWuhan 430074China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Natural gas hydrate has huge reserves and is widely distributed in marine environment.Its commercial development is of great significance for alleviating the contradiction between energy supply and demand.As an efficient research method,numerical simulation can provide valuable insights for the design and optimization of hydrate development.However,most of the current production models simplify the reservoir as a two-dimensional(2D)horizontal layered model,often ignoring the impact of formation dip angle.To improve the accuracy of production prediction and provide theoretical support for the optimization of production well design,two three-dimensional(3D)geological models with different dip angles based on the geological data from two typical sites are constructed.The vertical well,horizontal well and multilateral wells are deployed in these reservoirs with different permeabilities to perform production trial,and the sensitivity analysis of dip angles is also carried out.The short-term production behaviors in high and low permeability reservoirs with different dip angles are exhibited.The simulation results show that 1)the gas and water production behaviors for different well types in the two typical reservoirs show obviously different variation laws when the short-term depressurization is conducted in the inclined formation;2)the inclined formation will reduce the gas production and increase the water extraction,and the phenomena becomes pronounced as the dip angle increases,particularly in the low-permeability reservoirs;3)and the impact of formation dip on hydrate recovery does not change significantly with the variation of well type.

关键词： natural gas hydrate inclined formation depressurization production well type

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Hierarchically Structured Nb_(2)O_5 Microflowers with Enhanced Capacity and Fast-Charging Capability for Flexible Planar Sodium Ion Micro-Supercapacitors

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Nano-Micro Letters 2024年第4期16卷 97-109页

作者： jiaxin Ma Jieqiong qin Shuanghao Zheng Yinghua Fu Liping Chi Yaguang Li Cong Dong Bin Li Feifei Xing Haodong Shi Zhong‑Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China College of Science Henan Agricultural UniversityNo.63 Agricultural RoadZhengzhou 450002People’s Republic of China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China University of Chinese Academy of Sciences 19A Yuquan RoadShijingshan DistrictBeijing 100049People’s Republic of China Hebei Key Lab of Optic‑Electronic Information and Materials The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002People’s Republic of China

Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless, the development of NIMSCs are hugely impeded by the low capacity and sluggish Na ion kinetics in the negative electrode.Herein, we demonstrate a novel carbon-coated Nb_(2)O_5 microflower with a hierarchical structure composed of vertically intercrossed and porous nanosheets, boosting Na ion storage performance. The unique structural merits, including uniform carbon coating, ultrathin nanosheets and abun-dant pores, endow the Nb_(2)O_5 microflower with highly reversible Na ion storage capacity of 245 mAh g^(-1) at 0.25 C and excellent rate capability.Benefiting from high capacity and fast charging of Nb_(2)O_5 microflower, the planar NIMSCs consisted of Nb_(2)O_5 negative electrode and activated car-bon positive electrode deliver high areal energy density of 60.7 μWh cm^(-2),considerable voltage window of 3.5 V and extraordinary cyclability. Therefore, this work exploits a structural design strategy towards electrode materials for application in NIMSCs, holding great promise for flexible microelectronics.

关键词： Nb_(2)O_5 nanosheets Microflowers Sodium ion micro-supercapacitors Flexibility Energy storage

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Melatonin promotes the development of the secondary hair follicles by regulating circMPP5

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Journal of Animal Science and Biotechnology 2023年第4期14卷 1696-1712页

作者： Xiaogao Diao Lingyun Yao Tao Duan jiaxin qin Liwen He Wei Zhang Department of Animal Nutrition and Feed Science State Key Laboratory of Animal NutritionCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

Background The quality and yield of cashmere fibre are closely related to the differentiation and development of secondary hair follicles in the skin of cashmere goats.The higher the density of secondary hair follicles,the higher the quality and yield of cashmere from the fleece.Development of secondary hair follicles commences in the embryonic stage of life and is completed 6 months after birth.Preliminary experimental results from our laboratory showed that melatonin(MT)treatment of goat kids after their birth could increase the density of secondary hair follicles and,thus,improve the subsequent yield and quality of cashmere.These changes in the secondary hair follicles resulted from increases in levels of antioxidant and expression of anti-apoptotic protein,and from a reduction in apoptosis.The present study was conducted to explore the molecular mechanism of MT-induced secondary hair follicle differentiation and development by using whole-genome analysis.Results MT had no adverse effect on the growth performance of cashmere kids but significantly improved the character of the secondary hair follicles and the quality of cashmere,and this dominant effect continued to the second year.Melatonin promotes the proliferation of secondary hair follicle cells at an early age.The formation of secondary hair follicles in the MT group was earlier than that in the control group in the second year.The genome-wide data results involved KEGG analysis of 1044 DEmRNAs,91 DElncRNAs,1054 DEcircRNAs,and 61 DEmiRNAs which revealed that the mitogen-activated protein kinase(MAPK)signaling pathway is involved in the development of secondary hair follicles,with key genes(FGF2,FGF21,FGFR3,MAPK3(ERK1))being up-regulated and expressed.We also found that the circMPP5 could sponged miR-211 and regulate the expression of MAPK3.Conclusions We conclude that MT achieves its effects by regulating the MAPK pathway through the circMPP5 sponged the miR-211,regulating the expression of MAPK3,to induce the differentiation and proliferation of seconda

关键词： Cashmere MAPK Melatonin miR-211 Secondary hair follicle

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LipR functions as an intracellular pH regulator in Bacillus thuringiensis under glucose conditions

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mLife 2023年第1期2卷 58-72页

作者： Xia Cai jiaxin qin Xuelian Li Taoxiong Yuan Bing Yan Jun Cai Department of Microbiology College of Life SciencesNankai UniversityTianjinChina School of Life Science and Engineering Lanzhou University of TechnologyLanzhouChina Key Laboratory of Molecular Microbiology and Technology Ministry of EducationTianjinChina Tianjin Key Laboratory of Microbial Functional Genomics TianjinChina

Intracellular pH critically affects various biological processes,and an appropriate cytoplasmic pH is essential for ensuring bacterial growth.Glucose is the preferred carbon source for most heterotrophs;however,excess glucose often causes the accumulation of acidic metabolites,lowering the intracellular pH and inhibiting bacterial growth.Bacillus thuringiensis can effectively cope with glucose-induced stress;unfortunately,little is known about the regulators involved in this process.Here,we document that the target of the dual-function sRNA YhfH,the lipR gene,encodes a LacI-family transcription factor LipR as an intracellular pH regulator when B.thuringiensis BMB171 is suddenly exposed to glucose.Under glucose conditions,lipR deletion leads to early growth arrest by causing a rapid decrease in intracellular pH(~5.4).Then,the direct targets and a binding motif(GAWAWCRWTWTCAT)of LipR were identified based on the electrophoretic mobility shift assay,the DNase-I footprinting assay,and RNA sequencing,and the gapN gene encoding a key enzyme in glycolysis was directly inhibited by LipR.Furthermore,Ni^(2+)is considered a possible effector for LipR.In addition to YhfH,the lipR expression was coregulated by itself,CcpA,and AbrB.Our study reveals that LipR plays a balancing role between glucose metabolism and intracellular pH in B.thuringiensis subjected to glucose stress.

关键词： glucose intracellular pH LacI‐type transcription factor LipR

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多功能热电织物用于可穿戴无线传感系统

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Engineering 2024年第4期35卷 158-167页

作者： Xinyang He jiaxin Cai Mingyuan Liu Xuepeng Ni Wendi Liu Hanyu Guo Jianyong Yu Liming Wang Xiaohong qin Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Flexible thermoelectric materials play an important role in smart wearables,such as wearable power generation,self-powered sensing,and personal thermal management.However,with the rapid development of Internet of Things(IoT)and artificial intelligence(AI),higher standards for comfort,multifunctionality,and sustainable operation of wearable electronics have been proposed,and it remains challenging to meet all the requirements of currently reported thermoelectric devices.Herein,we present a multifunctional,wearable,and wireless sensing system based on a thermoelectric knitted fabric with over 600 mm·s^(-1)air permeability and a stretchability of 120%.The device coupled with a wireless transmission system realizes self-powered monitoring of human respiration through an mobile phone application(APP).Furthermore,an integrated thermoelectric system was designed to combine photothermal conversion and passive radiative cooling,enabling the characteristics of being powered by solar-driven in-plane temperature differences and monitoring outdoor sunlight intensity through the APP.Additionally,we decoupled the complex signals of resistance and thermal voltage during deformation under solar irradiation based on the anisotropy of the knitted fabrics to enable the device to monitor and optimize the outdoor physical activity of the athlete via the APP.This novel thermoelectric fabricbased wearable and wireless sensing platform has promising applications in next-generation smart textiles.

关键词： Thermoelectric fabrics Wearable device Wireless Multifunctional sensing system Outdoor wearable signal monitoring

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顶板瓦斯抽采巷布置位置智能预测方法

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煤炭科学技术 2024年第4期52卷 203-213页

作者：郭世斌胡国忠朱家锌许家林秦伟杨南中国矿业大学矿业工程学院江苏徐州221116 中国矿业大学煤炭精细勘探与智能开发全国重点实验室江苏徐州221116

顶板瓦斯抽采巷因具有大流量和连续抽采的优点,被广泛用于高瓦斯或突出矿井回采工作面瓦斯治理。如何确定合理的顶板巷布置位置,以高效抽采采空区卸压瓦斯,是保障工作面瓦斯治理效果的关键。为此,在深入分析顶板瓦斯抽采巷布置原则及其... 详细信息

顶板瓦斯抽采巷因具有大流量和连续抽采的优点,被广泛用于高瓦斯或突出矿井回采工作面瓦斯治理。如何确定合理的顶板巷布置位置,以高效抽采采空区卸压瓦斯,是保障工作面瓦斯治理效果的关键。为此,在深入分析顶板瓦斯抽采巷布置原则及其布置位置影响因素的基础上,提出了一种基于GA–BP神经网络模型的顶板瓦斯抽采巷布置位置智能预测方法;采用灰色关联分析法确定了GA–BP神经网络模型的预测指标,并设计开发了顶板瓦斯抽采巷布置位置智能预测系统。研究结果表明:①工作面的采厚、埋深、覆岩结构、煤层倾角、倾向长度等5个物理指标是顶板瓦斯抽采巷布置位置的主控因素,且其权重值排序由大到小依次为采厚、埋深、覆岩结构、煤层倾角、倾向长度。②随着遗传代数的增加,GA–BP神经网络适应度不断减小,且当遗传代数为60时其适应度变化基本稳定,表明GA–BP神经网络初始权重和偏置效果较好。③在当前训练样本数据集的前提下,基于GA–BP神经网络模型的顶板瓦斯抽采巷布置位置的预测结果与实际工况值的相对误差仅为0.43%~11.27%,在可接受的范围内。该研究可为顶板瓦斯抽采巷精准设计提供一定的参考。

关键词：瓦斯抽采顶板瓦斯抽采巷巷道布置遗传算法智能预测

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医院施工期间、结束后室内外真菌浓度监测

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中国真菌学杂志 2024年第2期19卷 122-125页

作者：陈琴王文博朱佳欣西部战区总医院疾病预防控制科成都610083

目的监测某三甲医院在施工期间及施工结束后室内外环境空气中真菌浓度,为预防与施工相关的院内侵袭性真菌病感染提供风险评估依据。方法2022年9月至2023年3月期间,在医院施工地附近选择室内外8个真菌浓度监测点位,分别使用平板沉降法和... 详细信息

目的监测某三甲医院在施工期间及施工结束后室内外环境空气中真菌浓度,为预防与施工相关的院内侵袭性真菌病感染提供风险评估依据。方法2022年9月至2023年3月期间,在医院施工地附近选择室内外8个真菌浓度监测点位,分别使用平板沉降法和空气撞击法监测空气中真菌浓度,通过比较不同区域空气中真菌浓度,评估施工期间医院不同区域院内真菌感染的风险。结果施工期间,采样点位与施工现场的距离增大,空气中真菌浓度随之降低;室内空气中真菌浓度低于室外;儿科普通病房空气中真菌菌落数高于新生儿病房,而新生儿病房高于手术室。施工结束后1个月,监测到室内外空气中真菌浓度明显降低。结论医院建筑工地施工会导致室内外空气中真菌含量显著提高;高风险部门落实有效的感染预防措施能显著减少环境真菌浓度。

关键词：医院施工空气真菌空气采样感染预防与控制

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基于心率变异性的自动睡眠分期及其脑电图验证

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中国生物医学工程学报 2024年第1期43卷 18-26页

作者：应少飞秦代友谢佳欣郜东瑞秦云刘铁军电子科技大学生命科学与技术学院成都610000 成都信息工程大学计算机学院成都610000

睡眠障碍会严重影响人们的日常生活,因此睡眠的早期监测对睡眠疾病的预防和诊断有重要意义。采用自行研制的便携式多导睡眠监护仪,开展了103人次的居家夜间睡眠数据收集(含脑电、眼电、肌电和心电信号)。然后,从同步采集的心电数据RR间... 详细信息

睡眠障碍会严重影响人们的日常生活,因此睡眠的早期监测对睡眠疾病的预防和诊断有重要意义。采用自行研制的便携式多导睡眠监护仪,开展了103人次的居家夜间睡眠数据收集(含脑电、眼电、肌电和心电信号)。然后,从同步采集的心电数据RR间期中提取时域、频率和非线性特征,组合出最高达426个心率变异性(HRV)特征,基于Xgboost算法构建模型对睡眠中的清醒期(wake)、非快速眼动|期(N1)、非快速眼动Ⅱ期(N2)、非快速眼动Ⅲ期(N3)和快速眼动期(REM)进行五分类(wake、N1、N2、N3、REM)、三分类(wake+N1、REM、N2+N3)和二分类(wake、N1+N2+N3+REM)预测,并与脑电图睡眠分期标签进行验证。最后,五分类、三分类和二分类测试结果准确率分别达到84.0%、89.1%和95.2%,F1-score达到83.2%、88.9%和94.9%,为同类模型研究中表现最佳。说明HRV与睡眠阶段具有良好的相关性,基于便携式设备收集数据构建的算法模型可以较好地识别睡眠状态。

关键词：心率变异性脑电图多导睡眠监护仪 Xgboost 自动睡眠分期

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甲烷选择氧化单原子催化剂的研究进展

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中国科学：化学 2024年第3期54卷 309-337页

作者：申恒芳李文翠蔡佳芯秦汉颖张航赵震中国石油大学(北京)重质油国家重点实验室北京102249 沈阳师范大学能源与环境催化研究所沈阳110034

单原子催化剂在原子利用率卓越、配位环境具有可调谐性等方面表现出独特优势.其独特的原子结构通过诱导甲烷中C–H键的静电极化显著降低活化能.稳定中间体并防止反应产物的过度氧化,加速了甲烷在温和条件下的反应速率.本文综述了近年来... 详细信息

单原子催化剂在原子利用率卓越、配位环境具有可调谐性等方面表现出独特优势.其独特的原子结构通过诱导甲烷中C–H键的静电极化显著降低活化能.稳定中间体并防止反应产物的过度氧化,加速了甲烷在温和条件下的反应速率.本文综述了近年来单原子催化剂在甲烷低温液相条件下直接选择性氧化为C1~C2含氧化合物方面的研究进展.具体讨论了不同载体(碳基材料、分子筛、金属氧化物、金属有机框架)上呈原子级分散型活性位点催化剂的设计及制备方法、活化甲烷的反应机理和载体与催化性能之间的构效关系.最后,简单讨论了各类原子级分散型催化剂在甲烷选择氧化反应中的优势与挑战,并对单原子催化剂的发展进行了展望.

关键词：单原子催化剂甲烷选择氧化碳基材料分子筛金属氧化物金属有机框架

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