检索结果-南通市图书馆

Modeling and analysis of gradient metamaterials for broad fusion bandgaps

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1155-1170页

作者： Changqi CAI Chenjie ZHU fengyi ZHANG Jiaojiao SUN Kai wang Bo YAN Jiaxi ZHOU School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou310018China School of Material and Environmental Engineering Hangzhou Dianzi UniversityHangzhou310018China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China

A gradient metamaterial with varying-stiffness local resonators is proposed to open the multiple bandgaps and further form a broad fusion ***,three local resonators with linearly increasing stiffness are periodically attached to the spring-mass chain to construct the gradient *** dispersion relation is then derived based on Bloch's theorem to reveal the fusion bandgap *** dynamic characteristic of the finite spring-mass chain is investigated to validate the fusion of multiple ***,the effects of the design parameters on multiple bandgaps are *** results show that the metamaterial with a non-uniform stiffness gradient pattern is capable of opening a broad fusion bandgap and effectively attenuating the longitudinal waves within a broad frequency region.

关键词： local resonance mechanism elastic metamaterial stiffness gradient bandgap fusion broadband wave attenuation

Tough lanthanide luminescent hydrogel for nitroaromatics detection

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第2期42卷 293-302,I0003页

作者： Shu Xie Fei Li fengyi Liu Quanqing Xu Xufeng Zhang College of Chemistry and Chemical Engineering Yunnan Normal UniversityKunming650092China

Luminescent hydrogels have received considerable attention in the application of *** matics are harmful to human health and can be *** skin allergies and central nervous system injuries may also be attributed to the over exposure to ***,nitroaromatics sensor with fast detection and low detection limit is highly ***,novel tough hydrogels were prepared by introducing hydrogen bonds and covalent bonds into the interpenetrating networks of modified chitosan and poly(vinyl alcohol)(PVA) via frozen-thawing induced chemical *** synthesized hydrogels exhibit high mechanical strength(0.23 MPa tensile strength at 140% tensile strain,1.0 MPa compressive strength at 80% compressive strain).Strong green emission was realized by energy transfer from the modified chitosan to Tb^(3+)via the so-called "antenna effect." The prepared luminescent hydrogels show an excellent detection effect on nitroaromatic compounds and its detection limit can reach *** hydrogels also exhibit good reversibility and a fast "off-on" fluorescence switching *** work may open up a new way for the development of stable,rapid,and reusable sensors for the detection of harmful nitroaromatics.

关键词： Hydrogels Lanthanide Luminescence Nitroaromatics Sensors Rare earths

在线全文

学校读者我要写书评

暂无评论

老年失能全周期综合康复管理模式专家共识

华西医学 2024年第6期39卷 856-865页

作者：刘瑞余中华张霞梁玉祥甘莉李利娟王凤怡魏全四川大学华西医院康复医学中心/康复医学研究所成都610041 康复医学四川省重点实验室成都610041 成都中医药大学附属四川省康复医院康复科成都610000

目前我国人口老龄化形势严峻,失能与半失能老年人数量也在持续增加,为社会带来沉重的负担。既往研究表明康复治疗有助于改善失能老人的各种功能障碍,帮助失能老人恢复日常生活活动能力和提高生活质量。但多学科综合管理模式在我国仍处... 详细信息

目前我国人口老龄化形势严峻,失能与半失能老年人数量也在持续增加,为社会带来沉重的负担。既往研究表明康复治疗有助于改善失能老人的各种功能障碍,帮助失能老人恢复日常生活活动能力和提高生活质量。但多学科综合管理模式在我国仍处于起步阶段,缺乏针对失能老人的多学科全周期综合康复管理探索。因此,该共识基于相关文献,从运动、视力、听力、认知、吞咽、心肺、二便、心理和日常生活活动9个功能维度为核心展开,就失能老年人的康复评估与干预进行总结,以期为开展失能老人综合康复管理工作提供参考。

关键词：老年人失能综合康复专家共识

CpG Island Definition and Methylation Mapping of the T2T-YAO Genome

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2024年第2期22卷 69-79页

作者： Ming Xiao Rui Wei Jun Yu Chujie Gao fengyi Yang Le Zhang College of Computer Science Sichuan UniversityChengdu 610065China Key Laboratory of Systems Health Science of Zhejiang Province School of Life ScienceHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China CAS Key Laboratory of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Precisely defining and mapping all cytosine(C)positions and their clusters,known as CpG islands(CGIs),as well as their methylation status,are pivotal for genome-wide epigenetic studies,especially when population-centric reference genomes are ready for timely ***,we first align the two high-quality reference genomes,T2T-YAO and T2T-CHM13,from different ethnic backgrounds in a base-by-base fashion and compute their genome-wide density-defined and position-defined ***,by mapping some representative genome-wide methylation data from selected organs onto the two genomes,we find that there are about 4.7%–5.8%sequence divergency of variable categories depending on quality *** among the divergent sequences are mostly associated with neurological ***,CGIs associated with the divergent sequences are significantly different with respect to CpG density and observed CpG/expected CpG(O/E)ratio between the two ***,we find that the T2T-YAO genome not only has a greater CpG coverage than that of the T2T-CHM13 genome when whole-genome bisulfite sequencing(WGBS)data from the European and American populations are mapped to each reference,but also shows more hyper-methylated CpG sites as compared to the T2T-CHM13 *** study suggests that future genome-wide epigenetic studies of the Chinese populations rely on both acquisition of high-quality methylation data and subsequent precision CGI mapping based on the Chinese T2T reference.

关键词： T2T-YAO Position-defined CpG island Density-defined CpG island DNA methylation Genome analysis

Reviewing electrochemical stability of ionic liquids-/deep eutectic solvents-based electrolytes in lithium-ion,lithium-metal and post-lithium-ion batteries for green and safe energy

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

Green Energy & Environment 2024年第6期9卷 966-991页

作者： Yu Chen Shuzi Liu Zixin Bi Zheng Li fengyi Zhou Ruifen Shi Tiancheng Mu Department of Chemistry and Material Science Langfang Normal UniversityNO.100 Aimin West RoadLangfangHebei065000China Department of Chemistry Renmin University of ChinNO.59 Zhongguancun StreetHaidian DistrictBeijing100872China

Sustainable energy is the key issue for the environment protection,human activity and economic *** liquids(ILs)and deep eutectic solvents(DESs)are dogmatically regarded as green and sustainable electrolytes in lithium-ion,lithium-metal(e.g.,lithium-sulphur,lithium-oxygen)and post-lithium-ion(e.g.,sodium-ion,magnesium-ion,and aluminum-ion)*** electrochemical stability of ILs/DESs is one of the prerequisites for green,sustainable and safe energy;while easy electrochemical decomposition of ILs/DESs would be contradictory to the concept of green chemistry by adding the cost,releasing volatile/hazardous by-products and hindering the ***,(1)are ILs/DESs-based electrolytes really electrochemically stable when they are not used in batteries?(2)are ILs/DESs-based electrolytes really electrochemically stable in real batteries?(3)how to design ILs/DESs-based electrolytes with high electrochemical stability for batteries to achieve sustainability and green development?Up to now,there is no summary on this topic,to the best of our ***,we review the effect of chemical structure and non-structural factors on the electrochemical stability of ILs/DESs in simulated *** importantly,electrochemical stability of ILs/DESs in real lithium-ion,lithium-metal and post-lithium-ion batteries is concluded and ***,the strategies to improve the electrochemical stability of ILs/DESs in lithium-ion,lithium-metal and post-lithium-ion batteries are *** review would provide a guide to design ILs/DESs with high electrochemical stability for lithium-ion,lithium-metal and postlithium-ion batteries to achieve sustainable and green energy.

关键词： Green solvents Decomposition Sustainable chemistry Lithium-oxygen batteries Lithium-sulphur batteries Sodium-ion batteries

The ABA synthesis enzyme allele OsNCED2^(T)promotes dryland adaptation in upland rice

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第1期12卷 68-78页

作者： Liyu Huang Yachong Bao Shiwen Qin Min Ning Qinyan Li Qingmao Li Shilai Zhang Guangfu Huang Jing Zhang Wensheng wang Binying Fu fengyi Hu Key Laboratory of Biology and Germplasm Innovation of Perennial Rice from Ministry of Agriculture and Rural Affairs School of AgricultureYunnan UniversityKunming 650091YunnanChina National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Upland rice shows dryland adaptation in the form of a deeper and denser root system and greater drought resistance than its counterpart,irrigated *** previous study revealed a difference in the frequency of the OsNCED2 gene between upland and irrigated populations.A nonsynonymous mutation(C to T,from irrigated to upland rice)may have led to functional variation fixed by artificial selection,but the exact biological function in dryland adaptation is *** this study,transgenic and association analysis indicated that the domesticated fixed mutation caused functional variation in OsNCED2,increasing ABA levels,root development,and drought tolerance in upland rice under dryland ***2-overexpressing rice showed increased reactive oxygen species-scavenging abilities and transcription levels of many genes functioning in stress response and development that may regulate root development and drought ***2^(T)-NILs showed a denser root system and drought resistance,promoting the yield of rice under dryland ***2^(T)may confer dryland adaptation in upland rice and may find use in breeding dryland-adapted,water-saving rice.

关键词： Upland rice Dryland adaptation ABA Root development Drought tolerance

HIV与COVID-19共感染患者死亡和重症风险的meta分析

在线全文

学校读者我要写书评

暂无评论

热带医学杂志 2024年第2期24卷 207-213页

作者：莫初叶康旖雯张君涵袁宗祥王凤仪韦雪芹韦吴迪蒋俊俊梁浩叶力广西医科大学公共卫生学院广西艾滋病防治研究重点实验室广西南宁530021 广西医科大学再生医学与医用生物资源开发应用协同创新中心广西南宁530021

目的评价人类免疫缺陷病毒(HIV)与新型冠状病毒肺炎(COVID-19)共感染患者的死亡和重症风险,提出基于循证的干预措施,以降低死亡和重症风险。方法检索2020年1月1日-2022年3月25日PubMed、Cochrane Library、中国知网(CNKI)和中国科技... 详细信息

目的评价人类免疫缺陷病毒(HIV)与新型冠状病毒肺炎(COVID-19)共感染患者的死亡和重症风险,提出基于循证的干预措施,以降低死亡和重症风险。方法检索2020年1月1日-2022年3月25日PubMed、Cochrane Library、中国知网(CNKI)和中国科技期刊数据库(CSTJ)关于HIV与COVID-19共感染相关的文献。采用Newcastle-Ottawa量表评估文献质量。运用R 4.1.2软件进行meta分析。结果本研究共纳入49篇文献,3 020 801例COVID-19病例。HIV与COVID-19共感染发生率约为2.80%(95%CI:1.600~4.700)。与非HIV感染的COVID-19患者相比,HIV与COVID-19共感染患者的重症风险更高(OR=1.341,95%CI:1.096~1.642);然而,死亡风险未增加(OR=1.093,95%CI:0.941~1.271)。CD4+T细胞计数<200/μL的COVID-19患者比CD4+T细胞计数≥200/μL的患者死亡风险更高(OR=1.810,95%CI:1.573~2.081)。累积meta分析显示,HIV与COVID-19共感染患者的重症累积OR值随着样本量加大逐渐增加。结论 HIV与COVID-19共感染患者发生重症的风险更高,应采取适当措施降低重症风险。HIV与COVID-19共感染患者是防疫重点人群。

关键词：新型冠状病毒肺炎人类免疫缺陷病毒 CD4+T细胞

病毒感染与睡眠障碍之间的关联性——基于NHANES数据库的横断面研究

在线全文

学校读者我要写书评

暂无评论

广西医学 2024年第1期46卷 122-128页

作者：莫初叶康旖雯袁宗祥张君涵王凤仪覃芳黄诗卉蒋俊俊梁浩叶力广西医科大学公共卫生学院广西艾滋病防治研究重点实验室广西南宁市530021 广西医科大学再生医学与医用生物资源开发应用协同创新中心广西南宁市530021

目的基于国家健康和营养检查调查(NHANES)数据库探讨多种病毒感染与睡眠障碍之间的关联性。方法选取NHANES数据库2009—2010年的横断面调查数据,根据睡眠障碍发生情况将研究对象分为睡眠障碍组与非睡眠障碍组。采用逆概率处理加权法(IP... 详细信息

目的基于国家健康和营养检查调查(NHANES)数据库探讨多种病毒感染与睡眠障碍之间的关联性。方法选取NHANES数据库2009—2010年的横断面调查数据,根据睡眠障碍发生情况将研究对象分为睡眠障碍组与非睡眠障碍组。采用逆概率处理加权法(IPTW)平衡两组研究对象的基线特征。采用χ^(2)检验及标准均数差(SMD)评估IPTW分析前后两组基线特征的均衡性;应用非条件Logistic回归(IPTW分析前)和加权Logistic回归(IPTW分析后)分析7种病毒感染与睡眠障碍之间的关联性。针对HAV感染与睡眠障碍之间的关联性进行亚组分析。结果共纳入2385名研究对象,其中146名纳入睡眠障碍组,2239名纳入非睡眠障碍组。IPTW分析前,两组的年龄、人群、家庭收入贫困比率(PIR)、吸烟的SMD>0.1,基本特征不均衡;IPTW分析后,两组的基线特征差异无统计学意义(SMD0.05),基本特征均衡。非条件Logistic回归结果显示,HAV感染、单纯疱疹病毒2型(HSV-2)感染与睡眠障碍存在相关性(P0.05)。亚组分析显示,HAV感染与睡眠障碍的关联性受年龄与教育水平等混杂因素显著影响(P交互作用<0.05)。结论经IPTW平衡基线特征后,HSV-2感染与睡眠障碍存在显著性关联。应对HSV-2感染者进行睡眠障碍情况筛查和干预,以提高该人群睡眠质量。

关键词：睡眠障碍病毒感染逆概率处理加权法国家健康和营养检查调查数据库

Polymorphic cerium-based Prussian blue derivatives with in situ growing CNT/Co heterojunctions for enhanced microwave absorption via polarization and magnetization

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 2050-2060页

作者： Jixi Zhou Xinmeng Huang Di Lan Yuhang Cheng fengyi Xue Chenyu Jia Guanglei Wu Zirui Jia Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

In this paper,the structure evolution of cerium cobaltohexanoate(Ce[Co(CN)6],Ce-Co Prussian blue analog(PBA))has been realized by solvent catalysis at room *** hexagonal bipyramidal microcrystals of Ce-Co PBA can be gradually transformed into dendrites by different proportions of ethanol(EtOH)and *** the same time,the porous dendrites CeO_(2)/Co@carbon nanotub(CNT)with oxygen-rich vacancies(OVs)can be obtained by annealing Ce-Co PBA at 700℃.The microstructure study shows that carbon nanotubes will be catalyzed after annealing at high temperature,and the cobalt metal particles encapsulated in carbon nanotubes will be anchored in the matrix,regulating the impedance matching and multi-polarization suppression of the material,and its unique structure,vacancies,and strong interface effect make the material exhibit excellent electromagnetic wave(EMW)absorption *** the matching thickness is 2.5 mm,the minimum reflection loss(RLmin)of the composite is-51.68 dB,and the effective absorption bandwidth(RL<-10 dB)is 7.76 *** results show that the prepared CeO_(2)/Co@CNT composite has excellent EMW absorption *** is expected to be a candidate material for EMW absorption.

关键词： Ce-Co Prussian blue analog(PBA) carbon nanotubes(CNTs) CeO_(2)/Co@CNT solvent catalysis electromagnetic wave absorption