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λ_(3)-最优连通混合Cayley图

高校应用数学学报（A辑） 2024年第1期39卷 114-120页

作者：陈来焕孟吉翔刘凤霞河南财经政法大学数学与信息科学学院河南郑州450003 新疆大学数学与系统科学学院新疆乌鲁木齐830046

对于连通图X=(V,E),如果X-F不连通并且X-F的每个分支至少含k个点,那么边集F⊆E是一个k-限制性边割.图X的k-限制性边连通度λ_(k)(X)为X的最小k-限制性边割的基数.该文给出了混合Cayley图的3-限制性边连通度和λ_(3)-最优性.

关键词：混合Cayley图限制性边连通度原子最优性

基于RIP1/RIP3探究西地那非对勃起功能障碍大鼠睾丸的影响

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中国临床药理学杂志 2024年第13期40卷 1938-1942页

作者：刘玉莲牛立盼杨培张蕊刘凤霞新疆医科大学基础医学院人体解剖学教研室新疆维吾尔自治区乌鲁木齐830011 新疆地方病分子生物学重点实验室新疆维吾尔自治区乌鲁木齐830011

目的探究程序性坏死通路在勃起功能障碍(ED)大鼠睾丸组织损伤中的作用及西地那非干预的机制。方法用高脂饲料喂养的方法建立ED大鼠模型,将其随机分为模型组、实验组、白细胞介素18组和实验+白细胞介素18组;另随机取10只大鼠为正常对照... 详细信息

目的探究程序性坏死通路在勃起功能障碍(ED)大鼠睾丸组织损伤中的作用及西地那非干预的机制。方法用高脂饲料喂养的方法建立ED大鼠模型,将其随机分为模型组、实验组、白细胞介素18组和实验+白细胞介素18组;另随机取10只大鼠为正常对照组。实验组灌胃20 mg·kg^(-1)西地那非;白细胞介素18组腹腔注射0.2μg·kg^(-1)白细胞介素18重组蛋白;实验组+白细胞介素18组灌胃20 mg·kg^(-1)西地那非、腹腔注射0.2μg·kg^(-1)白细胞介素18重组蛋白;正常对照组和模型组均灌胃等量0.9%NaCl和腹腔注射等量0.9%NaCl;实验组腹腔注射等量0.9%NaCl,白细胞介素18组灌胃等量0.9%NaCl,5组大鼠每天定时给药1次,连续给药14 d。用逆转录聚合酶链反应(RT-qPCR)和蛋白质印迹法检测大鼠睾丸组织中程序性坏死关键因子受体相互作用蛋白激酶1(RIP1)、受体相互作用蛋白激酶3(RIP3)、混合谱系激酶结构域样蛋白(MLKL)和钙离子-钙调蛋白依赖性蛋白激酶Ⅱ(CaMKⅡ)的表达。结果正常对照组、模型组、实验组、白细胞介素18组和实验+白细胞介素18组RIP1蛋白相对表达水平分别为0.58±0.05、0.99±0.09、0.71±0.05、1.23±0.07和0.81±0.07,RIP3蛋白相对表达水平分别为0.61±0.05、1.05±0.10、0.77±0.04、1.19±0.07和0.84±0.08,MLKL蛋白相对表达水平分别为0.63±0.05、1.13±0.08、0.79±0.05、1.30±0.02和1.00±0.04,CaMKⅡ蛋白相对表达水平分别为0.54±0.04、1.12±0.07、0.77±0.05、1.36±0.04和1.00±0.07;上述指标,模型组与正常对照组比较,实验组与模型组比较,白细胞介素18组与模型组比较,实验+白细胞介素18组与白细胞介素18组比较,在统计学上差异均有统计学意义(均P<0.05)。结论RIP1/RIP3介导的程序性坏死通路在ED大鼠睾丸损伤中发挥多重调控作用,西地那非可能通过抑制上述程序性坏死信号通路,改善大鼠睾丸功能。

关键词：西地那非勃起功能障碍程序性坏死受体相互作用蛋白激酶1/受体相互作用蛋白激酶3 睾丸

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溶剂热法制备磷酸锰锂的优化研究

现代化工 2024年第1期44卷 194-198页

作者：刘靓李志义魏炜刘凤霞刘志军大连理工大学流体与粉体工程研究设计所辽宁大连116024

橄榄石结构的磷酸锰锂(LiMnPO_(4))具有比容量高､热稳定性好和原料来源广泛等特点,与同为橄榄石结构的磷酸铁锂相比具有更高的放电电压。采用溶剂热法制备了高性能的磷酸锰锂正极材料,通过对过程参数进行优化实现材料性能的提升,以柠檬... 详细信息

橄榄石结构的磷酸锰锂(LiMnPO_(4))具有比容量高､热稳定性好和原料来源广泛等特点,与同为橄榄石结构的磷酸铁锂相比具有更高的放电电压。采用溶剂热法制备了高性能的磷酸锰锂正极材料,通过对过程参数进行优化实现材料性能的提升,以柠檬酸为添加剂优化颗粒形貌得到纳米级颗粒,并对碳层包覆进行优化。结果表明,柠檬酸添加量为1 mmol时,椭球状颗粒平均尺寸为42.3 nm;当以蔗糖为碳源且与LiMnPO_(4)质量比为1∶2时得到的碳层包覆颗粒尺寸较小､碳层石墨化程度更高;在最优参数下制备的LiMnPO_(4)材料具有更高的首次放电容量(126.9 mAh/g)及更优的倍率性能。

关键词：锂离子电池磷酸锰锂碳包覆溶剂热法纳米颗粒

Starlet:Network defense resource allocation with multi-armed bandits for cloud-edge crowd sensing in IoT

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Digital Communications and Networks 2024年第3期10卷 586-596页

作者： Hui xia Ning Huang Xuecai feng Rui Zhang Chao liu College of Computer Science and Technology Ocean University of ChinaQingdao266100China

The cloud platform has limited defense resources to fully protect the edge servers used to process crowd sensing data in Internet of *** guarantee the network's overall security,we present a network defense resource allocation with multi-armed bandits to maximize the network's overall ***,we propose the method for dynamic setting of node defense resource thresholds to obtain the defender(attacker)benefit function of edge servers(nodes)and ***,we design a defense resource sharing mechanism for neighboring nodes to obtain the defense capability of ***,we use the decomposability and Lipschitz conti-nuity of the defender's total expected utility to reduce the difference between the utility's discrete and continuous arms and analyze the difference ***,experimental results show that the method maximizes the defender's total expected utility and reduces the difference between the discrete and continuous arms of the utility.

关键词： Internet of things Defense resource sharing Multi-armed bandits Defense resource allocation

Single-atom catalysis for advanced oxidation and reduction systems in water decontamination

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Rare Metals 2024年第8期43卷 3576-3606页

作者： Jie Teng Jin-Hui Xu Wen-Xin Sun Xue-feng liu xia Xu Guo-Shuai liu School of Urban Construction Changzhou UniversityChangzhou 213164China School of Environmental and Civil Engineering Jiangnan UniversityWuxi 214122China

Water scarcity is an escalating global crisis,posing a severe threat to populations ***,exploring various materials to remove emerging contaminants from freshwater sources has garnered significant *** this regard,single-atom catalysis(SACs) has emerged as a catalyst of scientific progress in water purification and treatment methodologies during recent *** exhibit exceptional catalytic activity,selectivity and stability,due to their near-perfect atom utilization,highly unsaturated coordination environment and uniform reaction ***,a comprehensive and critical review encompassing the successful integration of SACs into water purification processes needs to be *** review aims to accentuate recent trends by presenting the synthesis,structure,and environment and energy application-relevant properties of *** results show that a comprehensive and multi-perspective summary of the advantages of SACs in environmental remediation can have significant benefits,such as fast kinetics,costeffectiveness,*** oxidation and reduction processes of SACs and functional SACs materials in water purification were ***,the last section is devoted to the current research gaps and further perspectives on the application of SACs in water treatment,which are summarized and analyzed.

关键词： Single-atom catalysis Water treatment Oxidation Reduction

Hemorrhagic transformation in patients with large-artery atherosclerotic stroke is associated with the gut microbiota and lipopolysaccharide

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Neural Regeneration Research 2024年第7期19卷 1532-1540页

作者： Qin Huang Minping Wei xianjing feng Yunfang Luo Yunhai liu Jian xia Department of Neurology Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina Department of Neurology Peking University People’s HospitalBeijingChina Clinical Research Center for Cerebrovascular Disease of Hunan Province Central South UniversityChangshaHunan ProvinceChina National Clinical Research Center for Geriatric Disorders Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina

Hemorrhagic transformation is a major complication of large-artery atheroscle rotic stroke(a major ischemic stro ke subtype)that wo rsens outcomes and increases *** of the gut microbiota is an important feature of stroke,and some specific bacteria and bacterial metabolites may contribute to hemorrhagic transformation *** aimed to investigate the relationship between the gut microbiota and hemorrhagic transformation in largearte ry atheroscle rotic stro *** observational retrospective study was *** May 2020 to September 2021,blood and fecal samples were obtained upon admission from 32 patients with first-ever acute ischemic stroke and not undergoing intravenous thrombolysis or endovascular thrombectomy,as well as 16 healthy *** with stro ke who developed hemorrhagic transfo rmation(n=15)were compared to those who did not develop hemorrhagic transformation(n=17)and with healthy *** gut microbiota was assessed through 16S ribosomal ribonucleic acid *** also examined key components of the lipopolysaccharide pathway:lipopolysaccharide,lipopolysaccharide-binding protein,and soluble *** observed that bacterial diversity was decreased in both the hemorrhagic transformation and non-hemorrhagic transfo rmation group compared with the healthy *** patients with ischemic stro ke who developed hemorrhagic transfo rmation exhibited altered gut micro biota composition,in particular an increase in the relative abundance and dive rsity of members belonging to the Enterobacteriaceae *** lipopolysaccharide and lipopolysaccharide-binding protein levels were higher in the hemorrhagic transformation group compared with the non-hemorrhagic transfo rmation ***,lipopolysaccharide-binding protein,and soluble CD14 concentrations were associated with increased abundance of Enterobacte ***,the role of the gut microbiota in hemorrhagic transformation was evaluated using

关键词： gut microbiota hemorrhagic transformation inflammation lipopolysaccharide stroke

Thermoelectric transport properties of p-type Bi_(2)Se_(3)-Sb_(2)Se_(3)-In_(2)Se_(3) high entropy compounds

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Rare Metals 2024年第7期43卷 3415-3421页

作者： feng Jiang Cheng-Liang xia Yong-Bin Zhu Jun Li Yue Chen Wei-Shu liu Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The introduction of entropy concept into thermoelectric materials recently has attracted broad ***,we showed the phase diagram of the ternary systems of Bi_(2)Se_(3)-Sb_(2)Se_(3)-In_(2)Se_(3).Among the high entropy compounds (HECs),we have identified an intrinsic p-type region near our previously reported Bi_(0.8)Sb_(0.8)In_(0.4)Se_3 in the phase diagram.

关键词： entropy (3) compounds

Short-term Association of Meteorological Elements on COVID-19 Pandemic in a Semi-arid City of Northwest China,2021-2022

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Biomedical and Environmental Sciences 2024年第5期37卷 537-542页

作者： feng feng liu MA Yu xia CHENG Bo Wen liu Zong Rui ZHAO Yu Han YANG Jie College of Atmospheric Sciences Key Laboratory of Semi-Arid Climate ChangeMinistry of EducationLanzhou UniversityLanzhou 730000GansuChina Minhe Meteorological Bureau Minhe 810800QinghaiChina

The coronavirus disease 2019(COVID-19)outbreak in late 2019 significantly impacted global *** virus’s rapid spread,with its long incubation period and high infection level,caused substantial disruption to regular social frameworks,production,and lifestyles^([1]).COVID-19 is primarily transmitted through close contact,long-range contaminants,and airborne routes.

关键词： Northwest COV primarily

Subnanometric bimetallic Pt–Pd clusters in zeolites for efficient hydrogen production and selective tandem hydrogenation of nitroarenes

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Science China Chemistry 2024年第9期67卷 2911-2917页

作者： Jiafu Li Tao Cai Yanran feng xia liu Ning Wang Qiming Sun Institute of Sustainable Energy and Resources College of Chemistry and Chemical Engineering Key Laboratory of Shandong Provincial Universities for Functional Molecules and Materials Qingdao University Innovation Center for Chemical Sciences College of Chemistry Chemical Engineering and Materials Science Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University

The solvolysis of ammonia borane（AB） and the hydrogenation of nitroarenes represent significant reactions for hydrogen generation and value-added chemical synthesis. The strategic engineering of the catalysts is imperative for surmounting obstacles associated with their stability and catalytic efficiency. In this work, subnanometric bimetallic Pt–Pd clusters were encapsulated within silicalite-1（S-1） zeolites through a ligand-protected in-situ hydrothermal synthesis method. The synergetic effect of bimetallic composition and zeolite confinement markedly enhances the catalytic performance of representative Pt0.5Pd0.5@S-1-H catalyst, affording exceptional turnover frequency（TOF） values of 1,043 and 573 molH2molmetal-1min-1for AB hydrolysis and methanolysis at ambient conditions, respectively, surpassing most of the state-of-the-art Pt-based *** and isotopic experiments reveal that the bimetallic catalytic system remarkably boosts the O–H cleavage of water,thereby facilitating the H2production from AB hydrolysis. Remarkably, a conspicuous synergistic effect is demonstrated in the shape-selective tandem hydrogenation of nitroarenes, with the bimetallic catalyst facilitating both AB hydrolysis and nitroarene hydrogenation, giving a high TOF value of 1,260 h-1under atmospheric pressure. This study not only demonstrates the effectiveness of bimetallic nanocatalysts encapsulated in zeolites for hydrogen production from chemical hydrogen storage materials, but also paves the way for the design of catalysts with multifunctional active sites capable of synergistically promoting tandem catalytic processes.

关键词： subnanometer bimetallic cluster zeolite synergistic effect ammonia borane solvolysis selective tandem hydrogenation