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化学学报 2008年第13期66卷 1541-1545页

作者：王亚妮蒋育澄冯云晓胡满成李淑妮陕西师范大学大分子科学陕西省重点实验室陕西师范大学化学与材料科学学院西安710062

通过石墨炉原子吸收法破膜检测胞内Rb+的含量,考察大环配体缬氨霉素运载Rb+跨膜的行为.基于传输过程的动力学研究,讨论了离子跨细胞膜时影响离子传输速率和跨膜量的各种因素.同时还以荧光法研究了RbCl对红细胞膜蛋白荧光强度的作用.结... 详细信息

通过石墨炉原子吸收法破膜检测胞内Rb+的含量,考察大环配体缬氨霉素运载Rb+跨膜的行为.基于传输过程的动力学研究,讨论了离子跨细胞膜时影响离子传输速率和跨膜量的各种因素.同时还以荧光法研究了RbCl对红细胞膜蛋白荧光强度的作用.结果显示,缬氨霉素传输Rb+跨人红细胞膜的行为呈现串联一级反应动力学特征,跨膜量主要受配体浓度、温育时间的影响.高浓度RbCl能够影响膜蛋白的荧光强度.

关键词： Rb^+ 跨膜行为缬氨霉素石墨炉原子吸收荧光

miRNA-21-5p is an important contributor to the promotion of injured peripheral nerve regeneration using hypoxia-pretreated bone marrow-derived neural crest cells

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Neural Regeneration Research 2025年第1期20卷 277-290页

作者： Meng Cong Jing-Jing hu Yan Yu xiao-Li Li xiao-Ting Sun Li-Ting Wang Xia Wu Ling-Jie Zhu xiao-Jia Yang Qian-Ru He Fei Ding Hai-Yan Shi School of Medicine Nantong UniversityNantongJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Coinnovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Physiology Jiangsu Health Vocational CollegeNanjingJiangsu ProvinceChina Department of Pathology Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina Jiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury Repair Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina

Our previous study found that rat bone marrow–derived neural crest cells(acting as Schwann cell progenitors)have the potential to promote long-distance nerve ***-based therapy can enhance peripheral nerve repair and regeneration through paracrine bioactive factors and intercellular ***,the complex contributions of various types of soluble cytokines and extracellular vesicle cargos to the secretome remain *** investigate the role of the secretome and extracellular vesicles in repairing damaged peripheral nerves,we collected conditioned culture medium from hypoxia-pretreated neural crest cells,and found that it significantly promoted the repair of sensory neurons damaged by oxygen-glucose *** mRNA expression of trophic factors was highly expressed in hypoxia-pretreated neural crest *** performed RNA sequencing and bioinformatics analysis and found that miR-21-5p was enriched in hypoxia-pretreated extracellular vesicles of neural crest ***,to further clarify the role of hypoxia-pretreated neural crest cell extracellular vesicles rich in miR-21-5p in axonal growth and regeneration of sensory neurons,we used a microfluidic axonal dissociation model of sensory neurons in vitro,and found that hypoxia-pretreated neural crest cell extracellular vesicles promoted axonal growth and regeneration of sensory neurons,which was greatly dependent on loaded ***,we constructed a miR-21-5p-loaded neural conduit to repair the sciatic nerve defect in rats and found that the motor and sensory functions of injured rat hind limb,as well as muscle tissue morphology of the hind limbs,were obviously *** findings suggest that hypoxia-pretreated neural crest extracellular vesicles are natural nanoparticles rich in ***-21-5p is one of the main contributors to promoting nerve regeneration by the neural crest cell *** helps to explain the mechanism of action of the secretome and e

关键词： axotomy cell-free therapy conditioned medium extracellular vesicles hypoxic preconditioning microRNA oxygen-glucose deprivation peripheral nerve injury Schwann cell precursors

Catalyst–Support Interaction in Polyaniline‑Supported Ni_(3)Fe Oxide to Boost Oxygen Evolution Activities for Rechargeable Zn‑Air Batteries

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Nano-Micro Letters 2025年第1期17卷 176-190页

作者： xiaohong Zou Qian Lu Mingcong Tang Jie Wu Kouer Zhang Wenzhi Li yunxia hu xiaomin Xu xiao Zhang Zongping Shao Liang An Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and TechnologyNanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Department of Chemistry The Chinese University of Hong KongMa Lin BuildingShatinHong Kong SAR 999077People’s Republic of China WA School of Mines:Minerals Energy and Chemical Engineering(WASM‑MECE)Curtin UniversityPerthWA 6102Australia Research Institute for Advanced Manufacturing The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China

Catalyst–support interaction plays a crucial role in improving the catalytic activity of oxygen evolution reaction(OER).Here we modulate the catalyst–support interaction in polyaniline-supported Ni_(3)Fe oxide(Ni_(3)Fe oxide/PANI)with a robust hetero-interface,which significantly improves oxygen evolution activities with an overpotential of 270 mV at 10 mA cm^(-2)and specific activity of 2.08 mA cm_(ECSA)^(-2)at overpotential of 300 mV,3.84-fold that of Ni_(3)Fe *** is revealed that the catalyst–support interaction between Ni_(3)Fe oxide and PANI support enhances the Ni–O covalency via the interfacial Ni–N bond,thus promoting the charge and mass transfer on Ni_(3)Fe *** the excellent activity and stability,rechargeable Zn-air batteries with optimum Ni_(3)Fe oxide/PANI are assembled,delivering a low charge voltage of 1.95 V to cycle for 400 h at 10 mA cm^(-2).The regulation of the effect of catalyst–support interaction on catalytic activity provides new possibilities for the future design of highly efficient OER catalysts.

关键词： Catalyst-support interaction Supported catalysts Heterointerface Oxygen evolution reaction Zn-air batteries

基于特权提升的多维量化属性弱点分类法的研究

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通信学报 2004年第7期25卷 107-114页

作者：张永铮云晓春胡铭曾哈尔滨工业大学计算机网络与信息安全技术研究中心黑龙江哈尔滨150001

在分析国际上典型的弱点分类方法的基础上,提出了一种基于特权提升的多维量化属性的弱点分类法,并以三个弱点为例,分析了该弱点分类法的特点,给出了弱点的风险评估算式以及风险评估级的划分。

关键词：网络安全计算机弱点弱点分类特权提升风险评估

基于mtDNA COI基因的甘肃截形叶螨不同地理种群遗传分化分析

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昆虫学报 2017年第9期60卷 1083-1092页

作者：杨顺义周兴隆宋丽雯严晓彤张小云张新虎沈慧敏甘肃农业大学植物保护学院甘肃省农作物病虫害生物防治工程实验室兰州730070

【目的】探讨甘肃截形叶螨Tetranychus truncatus种群遗传多样性、遗传分化及种群系统发育关系。【方法】本研究以2016年6-9月采自甘肃省8个不同生境的34个截形叶螨种群的518头螨样品进行mt DNA COI基因PCR扩增、测序,并利用MEGA7.0和Dn... 详细信息

【目的】探讨甘肃截形叶螨Tetranychus truncatus种群遗传多样性、遗传分化及种群系统发育关系。【方法】本研究以2016年6-9月采自甘肃省8个不同生境的34个截形叶螨种群的518头螨样品进行mt DNA COI基因PCR扩增、测序,并利用MEGA7.0和Dna SP5.0等软件分析截形叶螨不同种群的mt DNA COI基因序列变异和遗传分化情况。【结果】在34个截形叶螨地理种群中共获得518条mt DNA COI基因片段,测定片段长度为402 bp,T,C,A和G碱基平均含量分别为43.2%,10.5%,32.2%和14.0%,A+T含量(75.4%)明显高于C+G含量(24.6%),有明显的A/T偏倚性;核酸多样性性指数为0.0328。共检出12个单倍型,单倍型指数为0.8004,其中,H2出现了14次,分布于5个生态区域,为主体单倍型,占个体样本的41%。单倍型网络中介图表明各单倍型明显聚为5个聚类簇;12个单倍型的NJ系统发育树明显地分为4支,该结果与单倍型中介网络图的结果基本一致。各种群间的遗传距离在0.001~0.08955之间。UPGMA聚类图结果表明JQ(酒泉)种群和HS(合水)种群与其他种群相比分化明显。Mantel检测结果表明,种群间的遗传距离与地理距离无显著的相关性(r=0.043,P>0.05)。34个种群间的遗传分化指数Fst为0.11995,种群间变异比例为1.20%。【结论】甘肃省8个生态区的34个截形叶螨种群间的遗传距离与地理距离无显著相关性;截形叶螨的遗传变异主要来自于种群内部,种群间还未发生明显的遗传分化现象。

关键词：截形叶螨 mtDNA COI 种群遗传地理种群遗传分化甘肃

Photo‑Energized MoS_(2)/CNT Cathode for High‑Performance Li–CO_(2)Batteries in a Wide‑Temperature Range

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Nano-Micro Letters 2025年第1期17卷 160-175页

作者： Tingsong hu Wenyi Lian Kang hu Qiuju Li Xueliang Cui Tengyu Yao Laifa Shen Jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

Li–CO_(2) batteries are considered promising energy storage systems in extreme environments such as Mars;however,severe performance degradation will occur at a subzero temperature owning to the sluggish reaction ***,a photo-energized strategy adopting sustainable solar energy in wide working temperature range Li–CO_(2) battery was achieved with a binder-free MoS_(2)/carbon nanotube(CNT)photo-electrode as *** unique layered structure and excellent photoelectric properties of MoS_(2) facilitate the abundant generation and rapid transfer of photo-excited carriers,which accelerate the CO_(2) reduction and Li_(2)CO_(3) decomposition upon *** illuminated battery at room temperature exhibited high discharge voltage of 2.95 V and mitigated charge voltage of 3.27 V,attaining superior energy efficiency of 90.2%and excellent cycling stability of over 120 *** at an extremely low temperature of−30℃,the battery with same electrolyte can still deliver a small polarization of 0.45 V by the photoelectric and photothermal synergistic mechanism of MoS_(2)/CNT *** work demonstrates the promising potential of the photo-energized wide working temperature range Li–CO_(2) battery in addressing the obstacle of charge overpotential and energy efficiency.

关键词： Li-CO_(2)batteries Photo-energized Wide operation-temperature Kinetics MoS_(2)

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土地利用方式对土壤基本性质及肥力的影响

安徽农业科学 2017年第6期45卷 106-108页

作者：石利军王小云胡振华山西农业大学山西太谷030801 山西省水土保持科学研究所山西太原030045

[目的]研究不同土地利用方式下土壤基本性质及肥力的差异。[方法]以山西省吕梁市离石区王家沟为试验基地,研究侧柏和碱草混交、欧李、柠条、苜蓿、油松5种土地利用类型对土壤基本性质、有机质含量、有效磷含量及碱解氮含量的影响。[结果... 详细信息

[目的]研究不同土地利用方式下土壤基本性质及肥力的差异。[方法]以山西省吕梁市离石区王家沟为试验基地,研究侧柏和碱草混交、欧李、柠条、苜蓿、油松5种土地利用类型对土壤基本性质、有机质含量、有效磷含量及碱解氮含量的影响。[结果]不同土地利用方式土壤基本性质不同;有机质含量由高到低依次为侧柏和碱草混交、柠条、欧李、油松、苜蓿用地;有效磷含量由高到低依次为侧柏和碱草混交、油松、柠条、欧李、苜蓿用地;碱解氮含量由高到低依次为侧柏和碱草混交、苜蓿、欧李、柠条、油松用地。[结论]侧柏和碱草混交最有利于改良土壤、保土保肥。

关键词：土地利用方式有机质有效磷碱解氮

Extracting compressive stress-strain curve based on stick-slip shear banding process in bulk metallic glasses

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Journal of Iron and Steel Research International 2017年第4期24卷 372-377页

作者： Jing hu yun-xuan Weng xiao-li Li Bao-an Sun School of Material and Mechanical Engineering Beijing Technology and Business University Herbert Gleiter Institute of Nanoscience Nanjing University of Science & Technology

Based on the stick-slip process,an effective method to extract the stress-strain curve directly from the crosshead displacement-load raw data in compression of bulk metallic glasses was *** method was tested in two bulk metallic glass samples with different plasticities and shear band *** extracted stress-strain curves were found to well resemble the stress-strain curve measured by a laser *** addition,the extracted curve could resolve fine structures of serrated flow much better than that measured by extensometer,thus facilitating the study of shear banding *** obtained by this method made the stick-slip dynamics of shear banding valid,and this method could be employed to obtain the real strain of small-sized metallic glass samples where extensometer cannot be applied.

关键词： Serrated flow Shear banding Stick-slip Stress-strain curve

A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 555-577页

作者： Linlin Sun Zihui Wang Shukun Cui Ziquan Yan Weiping hu Qingchun Meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks