检索结果-南通市图书馆

Solid solution strategy modulated defects engineering of (Cr1-xVx)2AlC MAX phase toward superior electromagnetic wave absorption

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3205-3219页

作者： Ji-Lin Gou Yu-Kai Chang Shu Liu peng-hui Li Ping-Hao Cui Qian-Ku Hu Li-Bo Wang Xin Zhang Jun-Kai Wang Qi-Xun Xia Ai-Guo Zhou School of Materials Science and Engineering Henan Polytechnic University Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan University State Key Laboratory of Metastable Materials Science and Technology Yanshan University

Defects engineering is an effective strategy for manipulating electromagnetic parameters and enhancing electromagnetic wave（EMW） absorption ***,the relationship between them is not clear,especially in solid solution *** this work,a series of(Cr1-xVx)2AlC MAX phase solid solutions with layered structure were prepared via tuning the ratio of Cr and V to explore their EMW absorption *** experimental results indicated that the doping of V atoms at the M-site could effectively regulate its impedance matching and EMW absorption properties by introducing appropriate numbers of defects in the crystal,such as twin boundaries,dislocations and lattice *** them,if Cr:V=3:1,Cr1.5V0.5AlC,as radar absorption materials,could reach a strong reflection loss of-51.8 dB at the frequency of 12.8 GHz under an ultra-thin thickness of 1.3 *** reflection loss value could attain-10 dB in a wide frequency range of 2.7-18 GHz and thickness range of 1-5 *** addition,after high temperature and acid-alkali immersion treatment,this sample still had good EMW absorption capability,and the effective absorption bandwidth was enhanced from 2.3 to 2.6 GHz after concentrated acid immersion or 3.1 GHz after concentrated alkali *** work has great reference significance for the research and development of high-performance MAX-based EMW absorption materials in harsh environments.

关键词： MAX phases Solid solution Defects engineering Electromagnetic wave absorption Harsh environments

Achieving laparoscopic anatomic resection for hepatocellular carcinoma by fluorescence guided positive staining of hepatic cone unit

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2024年第4期23卷 406-411页

作者： Jun-Fang Deng Chuan-hui peng Yu Zhang Xiao-Feng Xu Rong-Liang Tong Zheng-Long Zhai Di-Yu Chen Cheng Zhang Li-Ming Wu Jian Wu Division of Hepatobiliary Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Laparoscopic anatomical liver resection has been increasingly reported worldwide,but how to demarcate the resection planes is technically challenging[1].Positive staining technique with intraoperative indocyanine green(ICG)-fluorescence imaging has been introduced as an effective tool for real-time intraoperative guidance[2].Liver anatomy is ***,liver is composed of 9 segments,each is composed of two to three subsegments,and each subsegment contains several hepatic cone units.A hepatic cone unit is dominated by a tertiary or quaternary hepatic pedicles[3].

关键词： hepatic resection anatomy

“Steric Armor”Strategy of Blue Fluorescent Emitters against Photooxidation-Induced Degradation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第11期42卷 1223-1229页

作者： Sha-Sha Wang Jing-Rui Zhang Kuan-De Wang Hao-Ran Li peng-hui Meng Yang Zhou Xiang Yu Ying Wei Quan-You Feng Yu-He Kan Ling-Hai Xie Centre for Molecular Systems and Organic Devices(CMSOD) State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&TelecommunicationsNanjingJiangsu210023 China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuai'anJiangsu223300 China

Stability against oxygen is an important factor affecting the performance of organic semiconductor *** photooxidation stability can prolong the service life of the device and maintain the mechanical and photoelectric properties of the ***,various encapsulation methods from molecular structure to macroscopic device level are used to improve photooxidation ***,we adopted a crystallization strategy to allow 14H-spiro[dibenzo[c,h]acridine-7,9′-fluorene](SFDBA)to pack tightly to resist fluorescence decay caused by *** this case,the inert group of SFDBA acts as a“steric armor”,protecting the photosensitive group from being attacked by ***,compared with the fluorescence quenching of SFDBA powder under 2 h of sunlight,SFDBA crystal can maintain its fluorescence emission for more than 8 h under the same ***,the photoluminescence quantum yields(PLQYs)of the crystalline film is 327%higher than that of the amorphous *** shows that the crystallization strategy is an effective method to resist oxidation.

关键词： Organic semiconductor Photooxidation Spirocyclic aromatic hydrocarbons Crystal engineering Fluorescence

大科学项目中政产学研如何合作?——基于行动者网络的视角

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

科学学研究 2024年第7期42卷 1439-1448页

作者：杜鹏辉中山大学政治与公共事务管理学院广东广州510275

大科学设施具有科学和工程双重属性,能够产生重大的科学价值和社会经济效益,是满足国家战略需求、建设科技强国的重要物质条件。主体间合作是设施项目运作的关键特征和成功的必要条件,然而中央和地方政府、科研院校、企业在价值观念、... 详细信息

大科学设施具有科学和工程双重属性,能够产生重大的科学价值和社会经济效益,是满足国家战略需求、建设科技强国的重要物质条件。主体间合作是设施项目运作的关键特征和成功的必要条件,然而中央和地方政府、科研院校、企业在价值观念、兴趣目标、利益诉求等方面存在着明显分歧,它们实现合作的过程和机制尚未得到充分讨论。基于行动者网络视角,通过对珠三角地区若干大科学设施的实地调研,研究发现:设施项目是以科研院校为核心的行动者网络构建过程,经历了问题识别与方案提供、符合利益和固定角色、建立不同类型合作联结、激活主体和维持网络4个阶段。此外,合作成功的关键在于所提出的方案符合各方利益,合作的首要挑战是各方对大科学设施缺乏认识,目前我国项目合作存在的问题是组织管理的协调和激励。本文拓展了政产学研合作在基础科学研究领域的研究,丰富了中国大科学设施项目运作的现实经验。

关键词：大科学设施工程项目行动者网络异质性科学合作

Curcumin for gastric cancer:Mechanism prediction via network pharmacology,docking,and in vitro experiments

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第8期16卷 3635-3650页

作者： peng-hui Yang Ya-Nan Wei Bi-Juan Xiao Si-Yi Li Xin-Long Li Liang-Jun Yang Hua-Feng Pan Geng-Xin Chen The Second School of Clinical Medicine Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina Department of Traditional Chinese Medicine The People's Hospital of LonghuaShenzhen 518109Guangdong ProvinceChina Department of Gastroenterology Tongde Hospital of Zhejiang ProvinceHangzhou 310012Zhejiang ProvinceChina Centre for Translational Medicine The Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510120Guangdong ProvinceChina

BACKGROUND Curcumin originates from the natural herb turmeric,and its antitumor effects have been known about for a long ***,the mechanism by which curcumin affects gastric cancer(GC)has not been *** To elucidate the potential mechanisms of curcumin in the treatment of *** Network pharmacological approaches were used to perform network analysis of *** first analyzed Lipinski’s Rule of Five for the use of *** latent targets were predicted using the PharmMapper,SwissTargetPrediction and DrugBank network *** disease targets were mined through the GeneCard,OMIM,DrugBank and TTD network ***,GO enrichment,KEGG enrichment,protein-protein interaction(PPI),and overall survival analyses were *** results were further verified through molecular docking,differential expression analysis and cell *** We identified a total of 48 curcumin-related genes with 31 overlapping GC-related *** intersection targets between curcumin and GC have been enriched in 81 GO biological processes and 22 significant *** PPI analysis,6 hub targets were identified,namely,estrogen receptor 1(ESR1),epidermal growth factor receptor(EGFR),cytochrome P450 family 3 subfamily A member 4(CYP3A4),mitogen-activated protein kinase 14(MAPK-14),cytochrome P450 family 1 subfamily A member 2(CYP1A2),and cytochrome p450 family 2 subfamily B member 6(CYP2B6).These factors are correlated with decreased survival rates among patients diagnosed with *** docking analysis further substantiated the strong binding interactions between Curcumin and the hub target *** experimental findings demonstrated that curcumin not only effectively inhibits the growth of BGC-823 cells but also suppresses their *** levels of hub targets CYP3A4,MAPK14,CYP1A2,and CYP2B6 in BGC-823 cells were significantly increased in each dose *** Curcumin can play an anti-GC role through a variety of

关键词： Curcumin Gastric cancer Network pharmacology Molecular docking Survival analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

温度对撞击器内颗粒沉积粒径影响的研究

力学学报 2024年第1期56卷 79-93页

作者：彭慧池辉徐聪尹招琴包福兵凃程旭中国计量大学计量测试工程学院杭州310018 福建省计量科学研究院福州350003

微颗粒的性质几乎与颗粒的粒径紧密相关,为研究气溶胶粒子特性,需获取颗粒粒径分布信息.惯性撞击器是一种基于惯性原理实现大气中不同粒径颗粒沉积分离的装置,在实际使用过程中,经历复杂多变的环境.文章利用拉格朗日多相(LMP)模型对撞... 详细信息

微颗粒的性质几乎与颗粒的粒径紧密相关,为研究气溶胶粒子特性,需获取颗粒粒径分布信息.惯性撞击器是一种基于惯性原理实现大气中不同粒径颗粒沉积分离的装置,在实际使用过程中,经历复杂多变的环境.文章利用拉格朗日多相(LMP)模型对撞击器内的气-固两相流动进行数值模拟,使用有限体积方法(FVM)研究了在绝热和换热两种情况下,气溶胶温度变化(-40℃~60℃)对颗粒沉积率的作用,并分析其对颗粒粒径分离的影响.结果表明:在壁面绝热情况下,随着气溶胶温度的升高,颗粒沉积位置由冲击板中心向边缘发散,颗粒收集效率逐渐降低,颗粒收集数量减少;在气溶胶和壁面换热情况下,随着气溶胶温度的升高,大颗粒沉积位置由冲击板中心向边缘发散,颗粒收集效率降低,小颗粒正好相反.此外,不同气溶胶温度下的颗粒收集效率曲线存在一个交点,交点两侧大小颗粒的收集效率随温度的变化情况相反.通过研究温度对撞击器颗粒收集的影响,可以对颗粒分径结果进行修正,获得更精确的粒径分布.

关键词：惯性撞击器气溶胶温度颗粒沉积颗粒收集效率拉格朗日多相模型

在线全文

学校读者我要写书评

暂无评论

地铁站应急疏散效率影响因素分析及优化策略

长安大学学报（自然科学版） 2024年第4期44卷 130-138页

作者：惠阳余强王永岗彭辉长安大学运输工程学院陕西西安710064 长安大学人文学院陕西西安710064 长安大学汽车学院陕西西安710064

为了提高地铁站突发事件发生时人员的应急疏散效率,通过深入分析搭建影响疏散效率的因素模型,并对各因素对应急疏散的影响进行综合评估。以西安市五路口地铁站为研究对象,运用Pathfinder仿真软件建立了应急疏散仿真模型,以此为基础构建... 详细信息

为了提高地铁站突发事件发生时人员的应急疏散效率,通过深入分析搭建影响疏散效率的因素模型,并对各因素对应急疏散的影响进行综合评估。以西安市五路口地铁站为研究对象,运用Pathfinder仿真软件建立了应急疏散仿真模型,以此为基础构建了包括客流特征、设施布局、列车运行和人员特征等一级指标评价模型。在评价模型的构建过程中,采用了算术平均值法、几何平均值法和特征值法进行权重求解,对影响因素的权重进行了全面分析,以准确识别出不同指标下关键应急疏散因子的权重。基于对地铁应急疏散影响因素分析,提出了一系列针对性的优化建议。研究结果表明:高峰列车通行数量、闸机的通行能力、楼梯的通行能力、列车的承载能力、人员的行为特征和扶梯的通行能力等6个因素对地铁应急疏散能力具有重要影响,综合权重占比约为85%,这些因素对地铁站的安全运营具有重要意义。研究结果对地铁站的安全性评价和紧急疏散能力提升具有重要意义,可为地铁运营管理部门提供科学依据和指导。

关键词：交通工程地铁站应急疏散效率层次分析法 Pathfinder 因子权重比

在线全文

学校读者我要写书评

暂无评论

NK细胞的发育分化及转录因子调控

中国免疫学杂志 2024年第7期40卷 1345-1354页

作者：何悦颜彭慧中国科学技术大学生命科学与医学部前沿交叉科学与生物医学研究所合肥230027

自然杀伤(NK)细胞是固有免疫系统重要成员,在抗病毒以及抗肿瘤中发挥重要作用。NK细胞发育分化历经多个阶段,受多种因素调控。成年机体外周组织广泛存在的经典NK(cNK)细胞主要由骨髓造血干细胞(HSCs)经共同淋巴祖细胞(CLPs)、NK细胞前体... 详细信息

自然杀伤(NK)细胞是固有免疫系统重要成员,在抗病毒以及抗肿瘤中发挥重要作用。NK细胞发育分化历经多个阶段,受多种因素调控。成年机体外周组织广泛存在的经典NK(cNK)细胞主要由骨髓造血干细胞(HSCs)经共同淋巴祖细胞(CLPs)、NK细胞前体(NKPs)阶段发育而来,转录因子在调控造血前体向NK细胞分化过程中发挥关键作用。近年随着固有淋巴细胞(ILCs)家族其他成员的发现和深入研究,揭示了NK细胞具有独立于其他ILCs亚群的发育路径,NK细胞发育分化阶段界定更为精细,一系列调控NK细胞各阶段发育分化的转录因子也逐步被发现。本文围绕NK细胞发育阶段的界定和转录因子调控方面展开论述,将有助于深入理解NK细胞的发育分化过程。

关键词： NK细胞发育分化转录调控

中国2023年经济形势分析与2024年展望

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

统计与信息论坛 2024年第4期39卷 20-30页

作者：许宪春彭慧唐雅中国金融四十人论坛北京100035 上海财经大学统计与管理学院上海200433 南京大学政府管理学院江苏南京210023

2023年是全面贯彻党的二十大精神的开局之年,经济恢复中的矛盾和挑战凸显,但也存在许多有利条件。文章基于重要统计指标和统计数据总结了2023年经济运行的基本特点:从生产角度看,经济增速持续恢复;第三产业对经济增长的贡献最大;第二产... 详细信息

2023年是全面贯彻党的二十大精神的开局之年,经济恢复中的矛盾和挑战凸显,但也存在许多有利条件。文章基于重要统计指标和统计数据总结了2023年经济运行的基本特点:从生产角度看,经济增速持续恢复;第三产业对经济增长的贡献最大;第二产业对经济增速持续恢复发挥重要作用。从需求角度看,消费需求拉动作用明显提升;投资需求对经济增长的拉动作用明显回落;净出口需求持续走弱,向下拉动经济增长。从收入角度看,居民收入增速稳定回升且快于GDP增速;企业利润降幅持续收窄。从价格角度看,消费领域价格涨幅明显回落;生产领域价格持续下降,降幅由扩大转为收窄。文章深入分析了中国当前经济发展中面临着有效需求不足、社会预期偏弱等挑战,同时经济发展中也具有新经济新动能持续增长、宏观政策空间广等有利条件,并对2024年经济发展进行了展望,初步判断,2024年经济增速在5%左右。

关键词：统计数据经济运行经济形势经济展望需求不足