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Multiphase reaction spinning of high-temperature resistant weavable SiO_(2)-Kevlar hybrid aerogel fibers

Nano Research 2025年第1期18卷 424-433页

作者： yunna Chen Wenlu Zhang Qingyang li Wenbin li Chong He School of Textile Science and Engineering Wuhan Textile UniversityWuhan 430200China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Advanced aerogel fibers possess numerousadvantages amalgamating the attributes of aerogels and fibermaterials, rendering them invaluable in the realm of thermalmanagement and regulation. However, the achievement ofrobust mechanical properties and increased temperaturestability is still a major challenge for the majority of aerogelfibers. Herein, SiO_(2)-Kevlar hybrid aerogel fibers with bioniccore-shell structure were prepared by reaction spinning andweaved into fabric. Kevlar nanowires dispersion is pumpedinto a bath comprising a self-synthesized silica sol, whichfacilitates the hybridization of biphasic aerogels through thegel reaction. Precise control over the diameter (200-800 μm)and structure of the wet gel fibers was achieved throughmeticulous adjustment of the spinning solution composition and spinning parameters. Subsequent freeze-drying processfacilitates the formation of a core-shell hybrid structure, in which the SiO_(2) aerogel layer effectively encapsulate the Kevlaraerogel core fiber. Taking full advantage of the mechanical properties of the Kevlar core fiber, the resulting SiO_(2)-Kevlaraerogel fibers exhibit commendable weaving characteristics (51.8 MPa). Furthermore, SiO_(2)-Kevlar aerogel fabrics exhibitenhanced thermal insulation characteristics with a thermal conductivity of 0.037 W/(m·K). As a result of the presence ofexternal SiO_(2) aerogel layer, the overall temperature resistance performance of the SiO_(2)-Kevlar fabric reach up to 700 ℃.

关键词： aerogel fibers SiO_(2)aerogel Kevlar aerogel reaction spinning thermal protective performance

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分数阶域噪声预测判决反馈均衡方法的研究

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应用科技 2014年第1期41卷 30-34页

作者：安澄全李云娜哈尔滨工程大学信息与通信工程学院黑龙江哈尔滨150001

针对单载波频域均衡中噪声预测判决反馈均衡结构,介绍了一种基于独特字块结构的分数阶域噪声预测均衡方法,即将接收端的时域信号转换到分数阶域实现噪声预测判决反馈均衡。分数阶域的判决反馈均衡在保持前馈与反馈部分相互独立的同时,... 详细信息

针对单载波频域均衡中噪声预测判决反馈均衡结构,介绍了一种基于独特字块结构的分数阶域噪声预测均衡方法,即将接收端的时域信号转换到分数阶域实现噪声预测判决反馈均衡。分数阶域的判决反馈均衡在保持前馈与反馈部分相互独立的同时,还利用了分数阶域信号的灵活性使均衡效果更好;与此同时,利用独特字的已知特性,在接收端将独特字和有用数据分开,再进行分数阶域均衡处理,恢复出原始数据。仿真结果表明,基于独特字的分数阶域噪声预测判决反馈方法相比传统基于循环前缀的均衡方法性能有很大提升。

关键词：分数阶傅里叶变换独特字判决反馈均衡噪声预测循环前缀

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刚地弓形虫亲环蛋白基因TgCyP真核表达质粒的构建及其在Hela细胞内的表达

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基因组学与应用生物学 2011年第4期30卷 311-315页

作者：李运娜黄金贵李建华宫鹏涛杨举李赫李淑红张西臣吉林大学畜牧兽医学院长春130062 吉林大学白求恩医学院长春130062

亲环蛋白(cyclophilin,CyP)是一类广泛存在于原核和真核生物体内的胞溶性蛋白,是刚地弓形虫(Toxoplasma gondii)速殖子的主要成分,能够诱导产生IL-12和IFN-γ,在控制弓形虫急性感染过程中起重要作用。本研究根据GenBank发表的TgCyP基因... 详细信息

亲环蛋白(cyclophilin,CyP)是一类广泛存在于原核和真核生物体内的胞溶性蛋白,是刚地弓形虫(Toxoplasma gondii)速殖子的主要成分,能够诱导产生IL-12和IFN-γ,在控制弓形虫急性感染过程中起重要作用。本研究根据GenBank发表的TgCyP基因序列,设计并合成一对包含BamHⅠ和EcoRⅠ酶切位点的引物,以cDNA为模板,应用PCR技术扩增TgCyP基因。PCR产物连接到pMD18-T克隆载体。用限制性内切酶BamHⅠ和EcoRⅠ双酶切克隆载体,将TgCyP目的基因克隆到载体pVAX1,构建真核表达质粒pVAX1-TgCyP。将真核表达质粒转染Hela细胞,利用间接免疫荧光检测其在Hela细胞内的表达情况。结果表明扩增的TgCyP基因与GenBank上相应基因序列(U04633.1)的一致性达100%,构建的真核表达质粒pVAX1-TgCyP能在转染的Hela细胞中表达,其表达产物与刚地弓形虫阳性血清具有免疫反应性。本研究表明Tg-CyP有望作为弓形虫疫苗的候选抗原,将为进一步研究该质粒的动物免疫试验奠定基础。

关键词：刚地弓形虫 TgCyP,基因克隆真核表达

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He li li Sai Wang Shao-Jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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Cell polarization in ischemic stroke: molecular mechanisms and advances

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Neural Regeneration Research 2025年第3期20卷 632-645页

作者： Yuanwei li Xiaoxiao Xu Xuan Wu Jiarui li Shiling Chen Danyang Chen Gaigai li Zhouping Tang Department of Neurology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Ischemic stroke is a cerebrovascular disease associated with high mortality and disability rates. Since the inflammation and immune response play a central role in driving ischemic damage, it becomes essential to modulate excessive inflammatory reactions to promote cell survival and facilitate tissue repair around the injury site. Various cell types are involved in the inflammatory response, including microglia, astrocytes, and neutrophils, each exhibiting distinct phenotypic profiles upon stimulation. They display either proinflammatory or anti-inflammatory states, a phenomenon known as ‘cell polarization.’ There are two cell polarization therapy strategies. The first involves inducing cells into a neuroprotective phenotype in vitro, then reintroducing them autologously. The second approach utilizes small molecular substances to directly affect cells in vivo. In this review, we elucidate the polarization dynamics of the three reactive cell populations(microglia, astrocytes, and neutrophils) in the context of ischemic stroke, and provide a comprehensive summary of the molecular mechanisms involved in their phenotypic switching. By unraveling the complexity of cell polarization, we hope to offer insights for future research on neuroinflammation and novel therapeutic strategies for ischemic stroke.

关键词： astrocyte polarization immune regulation inflammation ischemic injury microglia polarization neutrophil polarization signaling pathways stroke

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Design of a cationic accelerator enabling ultrafast ion diffusion kinetics in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 377-384页

作者： Yawei Xiao Qianqian Gu Haoyu li Mengyao li Yude Wang National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources School of Chemistry and Chemical Engineering Hainan University College of Chemical Engineering Fuzhou University yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies Yunnan University

Aqueous zinc-ion batteries are highly favored for grid-level energy storage owing to their low cost and high safety,but their practical application is limited by slow ion *** address this,a strategy has been developed to create a cation-accelerating electric field on the surface of the cathode to achieve ultrafast Zn2+diffusion *** employing electrodeposition to coat MoS2on the surface of BaV6O16·3H2O nanowires,the directional built-in electric field generated at the heterointerface acts as a cation accelerator,continuously accelerating Zn2+diffusion into the active *** optimized Zn2+diffusion coefficient in CC@BaV-6O16·3H2O@MoS2(7.5×10～8cm2s-1) surpasses that of most reported V-based ***,MoS2serving as a cathodic armor extends the cycling life of the Zn-CC@BaV6O16·3H2O@MoS2full batteries to over 10000 *** work provides valuable insights into optimizing ion diffusion kinetics for high-performance energy storage devices.

关键词： Internal electric field Cationic accelerator Ion diffusion kinetics Cathode modification strategy Aqueous zinc ion battery

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热带典型有机物料对砖红壤理化性质及微生物群落结构的影响

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热带作物学报 2023年第4期44卷 834-845页

作者：宋书会焦静李普旺王超何祖宇周闯刘运浩张宇晗李云娜杨子明中国热带农业科学院南亚热带作物研究所/海南省热带作物营养重点实验室广东湛江524091 华南农业大学资源环境学院广东广州510642 云南省农业科学院茶叶研究所云南昆明650205

为了明确热带典型有机物料对砖红壤理化性质及微生物群落结构的影响,本研究选取菠萝茎叶、椰糠、香蕉茎叶、有机肥为供试材料,开展为期90 d的混土培养试验,以砖红壤为对照,分析有机物料对土壤pH、有效磷,团聚体、微生物群落结构变化及... 详细信息

为了明确热带典型有机物料对砖红壤理化性质及微生物群落结构的影响,本研究选取菠萝茎叶、椰糠、香蕉茎叶、有机肥为供试材料,开展为期90 d的混土培养试验,以砖红壤为对照,分析有机物料对土壤pH、有效磷,团聚体、微生物群落结构变化及酶活性的影响。结果表明,香蕉茎叶和有机肥能够提高土壤pH和有效磷含量,菠萝茎叶短期内加剧土壤酸化。菠萝茎叶和香蕉茎叶均有助于促进直径>0.25 mm团聚体的形成。菠萝茎叶、香蕉茎叶和有机肥均能提高土壤木糖苷酶、纤维素酶和亮氨酸氨基肽酶活性,以及土壤G^(+)菌、G^(–)菌、真核生物和真菌的数量,其中香蕉茎叶和菠萝茎叶培养的土壤中G^(+)菌平均占比为27.8%,高于CK中G^(+)菌(21.4%)。与CK相比,香蕉茎叶、菠萝茎叶、椰糠、有机肥中的真菌比例分别提高300.2%、232.1%,165.0%和51.9%。施用有机肥明显提高AM真菌的比例,菠萝茎叶和香蕉茎叶均有助于增加土壤中的真核生物数量。投入有机物料中的半纤维素含量和土壤pH分别解释了70.8%和8.5%的微生物群落结构变异。

关键词：热带有机物料砖红壤理化性质微生物群落

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Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong li li Dan Jing Peng Qidong Yang Fuqiang Yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

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In situ observation of the electrochemical behavior of li–CO_(2)/O_(2)batteries in an environmental transmission electron microscope

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Carbon Energy 2024年第4期6卷 244-255页

作者： Peng Jia yunna Guo Dongliang Chen Jingming Yao Xuedong Zhang Jianguo Lu Yuqing Qiao liqiang Zhang Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdaoChina State Key Laboratory of Metastable Materials Science and Technology Clean Nano Energy CenterYanshan UniversityQinhuangdaoChina State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtanChina

li–CO_(2)/O_(2)batteries,a promising energy storage technology,not only provide ultrahigh discharge capacity but also capture CO_(2)and turn it into renewable *** electrochemical reaction pathways'ambiguity,however,creates a hurdle for their practical *** study used copper selenide(CuSe)nanosheets as the air cathode medium in an environmental transmission electron microscope to in situ study li–CO_(2)/O_(2)(mix CO_(2)as well as O_(2)at a volume ratio of 1:1)and li–O_(2)batteries as well as li–CO_(2)*** discharge reactions take place successively in the li–CO_(2)/O_(2)–CuSe nanobattery:(I)4li^(+)+O_(2)+4e^(−)→2li_(2)O;(II)li_(2)O+CO_(2)→li_(2)CO_(3).The charge reaction proceeded via(III)2li_(2)CO_(3)→4li^(+)+2CO_(2)+O_(2)+4e^(−).However,li–O_(2)and li–CO_(2)nanobatteries showed poor cycling stability,suggesting the difficulty in the direct decomposition of the discharge *** fluctuations of the li–CO_(2)/O_(2)battery's electrochemistry were also shown to depend heavily on O_(2).The CuSe‐based li–CO_(2)/O_(2)battery showed exceptional electrochemical *** li^–CO_(2)/O_(2)battery offered a discharge capacity apex of 15,492 mAh g^(−1) and stable cycling 60 times at 100 mA g^(−1).Our research offers crucial insight into the electrochemical behavior of li–CO_(2)/O_(2),li–O_(2),and li–CO_(2)nanobatteries,which may help the creation of high‐performance li–CO_(2)/O_(2)batteries for energy storage applications.

关键词： CuSe nanosheets electrochemical reaction in situ environmental transmission electron microscopy li-CO_(2)battery li-CO_(2)/O_(2)battery li-O_(2)battery

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In-situ imaging electrocatalysis in a solid-state li-O_(2) battery with CuSe nanosheets as air cathode

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Chinese Chemical Letters 2024年第5期35卷 466-470页

作者： Peng Jia yunna Guo Dongliang Chen Xuedong Zhang Jingming Yao Jianguo Lu liqiang Zhang Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310058China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China

The development of highly efficient catalysts in the cathodes of rechargeable li-O_(2) batteries is a considerable *** enhance the electrochemical performance of the li-O_(2) battery,it is essential to choose a suitable catalyst *** selenide(CuSe)is considered as a more promising cathode catalyst material for li-O_(2) battery due to its better conductivity and rich electrochemical active ***,its electrochemical reaction and fundamental catalytic mechanism remain unclear till ***,in-situ environmental transmission electron microscopy technique was used to study the catalysis mechanism of the CuSe nanosheets in li-O_(2) batteries during discharge and charge *** is found that li_(2)O was formed and decomposed around the ultrafine-grained Cu during the discharge and charge processes,respectively,demonstrating excellent *** indicate that the freshly formed ultrafine-grained Cu in the conversion reaction catalyzed the latter four-electron-transfer oxygen reduction reaction,leading to the formation of li_(2)*** study provides important understanding of the electrochemistry of the liO_(2) nanobatteries,which will aid the development of high-performance li-O_(2) batteries for energy storage applications.

关键词： In-situ environmental transmission electron microscopy lithium oxygen batteries CuSe nanosheets Oxygen reduction reaction Oxygen evolution reaction

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