检索结果-南通市图书馆

Nano Research 2024年第9期17卷 8552-8559页

作者： Donghao Zhang Lianxi Si Qianqian Ren Xintong Yan shi hu Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China

Pd-based catalysts exhibit higher catalytic activity and durability in many electrochemical ***,the electrochemical performance can be further enhanced by fine-tune of the alloy *** binary alloys have been fully studied,the multicomponent alloys are far beyond understanding,which leaves cocktail effect a compromised explanation for the high-entropy *** Pd nanosheet-seeded growth was used to synthesize a Pd-Zn-Cd ternary alloy by accurately controlling the Pd-Zn-Cd molar ratio through adjusting the amount of introduced Cd *** analysis of the crystal phase structure of PdCdZnx and PdZn_(x)Cd_(1-x),the competitive relationship of Zn and Cd in the alloying process with Pd was unveiled:Pd1Cd1 intermetallics(IMC)is thermodynamically favored over Pd_(1)Zn_(1)IMC in the ternary ***,the increased structure stability of PdCd over PdZn does not bring about increased durability in the catalytic ethanol oxidation *** morphology selection of Pd seeds is also crucial for the study,as Pd cubes,Pd tetrahedrons,and Pd octahedrons do not form PdZn in the same *** successful alloying through the seeded growth depends on the maximum diffusion depth of foreign atoms into the seed.

关键词： PdZn alloy seed growth method ethanol oxidation reaction composition control ternary alloying

Highly efficient labelling of extracellular vesicles for enhanced detection on a microfluidic platform

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

Chinese Chemical Letters 2024年第2期35卷 441-445页

作者： shi hu Rui Hao Zitong Yu huitao Zhang hui Yang Bionic Sensing and Intelligence Center Institute of Biomedical and Health EngineeringShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Developing precise extracellular vesicles(EVs)labelling techniques with minimal disturbance is of great importance to the follow-up EVs detection and ***,currently available methods such as using probes to conjugate phospholipids or membrane proteins have certain limitations due to EV steric hindrance,dye aggregation,***,we present a microfluidic platform to enhance EVs’labelling efficiency and improve their *** platform provides excellent sample throughput and high-efficiency EV labelling at lower label concentrations with an optimized flowing *** cytometry analysis(FCM)and cellular uptake results show that EV labelling by utilizing this platform possesses the merits of a higher labelling efficiency with 64.1%relative improvement than conventional co-incubation method and a lower background ***,this technique maintains EVs’size,morphology and biological *** the recipient cells uptake the EVs treated by the microfluidic platform,the spatial and temporal distribution of EVs in the cells are clearly *** results demonstrate that our method holds great potential in efficient labelling of EVs,which is essential to subsequent EV quantification and analysis.

关键词： Microfluidic platform Extracellular vesicles Labelling PKH dye Flow cytometry

Dynamic aggregation of carbon dots self-stabilizes symmetry breaking for exceptional hydrogen production with near-infrared light

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2024年第1期5卷 385-397页

作者： Qi Zhang Ya Zhang hu shi Hongxia Zhang Jianghong Zhao Zhanfeng Zheng Hengquan Yang Pengju Yang School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuanChina Engineering Research Center of Ministry of Education for Fine Chemicals Shanxi UniversityTaiyuanChina Institute of Molecular Science Shanxi UniversityTaiyuanChina State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuanChina

Developing new photosystems that integrate broad-band near-infrared(NIR)light harvesting and efficient charge separation is a long-sought goal in the photocatalytic *** this work,we develop a novel photochemical strategy to prepare light-active carbon dots(CDs)under room temperature and discover that the aggregation of CDs can broaden the light absorption to the NIR region due to the electronic couplings between neighboring ***,the dynamic noncovalent interactions within CD aggregates can stabilize symmetry breaking and thus induce large dipole moments for charge separation and ***,the weak non-covalent interactions allow for flexible design of the aggregated degrees and the local electronic structures of CD aggregates,further strengthening NIR-light harvesting and charge separation *** a result,the CD aggregates achieve a record apparent quantum yield of 13.5%at 800 nm,which is one of the best-reported values for NIR-light-driven hydrogen photosynthesis to ***,we have prepared a series of different CDs and also observed that these CDs after aggregation all exhibit outstanding NIR-responsive photocatalytic hydrogen production activity,suggesting the universality of aggregation-enhanced *** discovery opens a new promising platform for using CD aggregates as efficient light absorbers for solar conversion.

关键词： aggregation charge separation hydrogen production near-infrared light photocatalysis

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

南宋易学家方实孙生平著述考略

周易研究 2024年第2期 43-49页

作者：胡士颍中国社会科学院大学哲学院北京102488 中国社会科学院哲学研究所北京100732

方实孙是南宋晚期著名易学家。其生平行止历来未有详考者,且误传误信,多有谬误。关于方实孙的家族、家世,刘克庄之文提供了重要资料,但所记与宗谱有所出入。从《后村先生大全集》编纂来看,方实孙进献《易说》、以布衣身份入史局的时间应... 详细信息

方实孙是南宋晚期著名易学家。其生平行止历来未有详考者,且误传误信,多有谬误。关于方实孙的家族、家世,刘克庄之文提供了重要资料,但所记与宗谱有所出入。从《后村先生大全集》编纂来看,方实孙进献《易说》、以布衣身份入史局的时间应在1252年刘克庄写《送方实孙》与《方实孙经史说》跋之间。关于方氏科举功名之说,历史所载颇为不实。方实孙不可能是庆元五年进士,他有没有中过进士,答案可能也是否定的。方氏经史著作唯易著似存,即四库全书所收《淙山读周易记》,是书原名应作《读易记》或《读周易》。方氏解说经传受《正义》《程传》影响较大,以义理阐释为主,同时亦论图书,二者应完成于不同阶段。有学者把方实孙视为朱子后学,实则他对朱熹易学有所保留,或言接受有一渐进过程,方氏为朱熹拥趸之说需要更多证据支持。

关键词：方实孙莆田方氏刘克庄《读周易记》朱熹

Assessing the range of blasting-induced cracks in the surrounding rock of deeply buried tunnels based on the unified strength theory

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第7期31卷 2341-2364页

作者： LI Liang CHEN Jia-jun ZHAO Lian-heng HE Ke-pei hu shi-hong LI hua-long School of Civil Engineering Central South UniversityChangsha 410075China Key Laboratory of Heavy-haul Railway Engineering Structure Ministry of EducationCentral South UniversityChangsha 410075China hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure Central South UniversityChangsha 410075China

Blasting-induced cracks in the rock surrounding deeply buried tunnels can result in water gushing and rock mass collapse,posing significant safety ***,previous theoretical studies on the range of blasting-induced cracks often ignore the impact of the in-situ stress,especially that of the intermediate principal *** particle displacement−crack radius relationship was established in this paper by utilizing the blasthole cavity expansion equation,and theoretical analytical formulas of the stress−displacement relationship and the crack radius were derived with unified strength theory to accurately assess the range of cracks in deep surrounding rock under a blasting *** analysis showed that the crushing zone size was positively correlated with in-situ stress,intermediate principal stress,and detonation pressure,whereas negatively correlated with Poisson ratio and decoupling *** dilatancy angle-crushing zone size relationship exhibited nonmonotonic *** relationships in the crushing zone and the fracture zone exhibited opposite trends under the influence of only in-situ stress or intermediate principal *** the in-situ stress increased from 0 to 70 MPa,the rate of change in the crack range and the attenuation rate of the peak vibration velocity gradually slowed.

关键词： deep drilling and blasting cracks in surrounding rock unified strength theory intermediate principle stress in-situ stress cavity expansion dilatancy characteristics

我国药品生产质量管理规范检查质量评价体系构建研究

在线全文

学校读者我要写书评

暂无评论

中国新药杂志 2024年第3期33卷 209-215页

作者：胡士高武志昂沈阳药科大学工商管理学院沈阳110016 安徽省药品审评查验中心合肥230051 沈阳药科大学亦弘商学院北京100055

目前我国药品生产质量管理规范(GMP)检查质量评价方面没有特别统一的标准和可实施的参照标准,为进一步推进和完善我国药品GMP检查制度,提升药品GMP检查质量,本研究通过文献研究和专家访谈的方法设计出调查问卷,然后通过调查研究形成我... 详细信息

目前我国药品生产质量管理规范(GMP)检查质量评价方面没有特别统一的标准和可实施的参照标准,为进一步推进和完善我国药品GMP检查制度,提升药品GMP检查质量,本研究通过文献研究和专家访谈的方法设计出调查问卷,然后通过调查研究形成我国药品GMP检查质量评价指标,构建了药品GMP检查质量评价体系。本文新构建的GMP检查质量评价体系和可行性的实证方案建议有助于进一步推进我国药品GMP相关检查工作,提升检查水平。

关键词：生产质量管理规范检查质量评价指标评价体系

在线全文

学校读者我要写书评

暂无评论

双叶片液压关节主被动联合柔顺控制分析

吉林大学学报（工学版） 2024年第1期54卷 86-98页

作者：赵慧朱发强蒋林王诗虎武汉科技大学冶金装备及其控制教育部重点实验室武汉430081 武汉科技大学机器人与智能系统研究院武汉430081

双叶片液压被动柔顺回转关节在受到外界环境的碰撞时,关节的被动柔顺性会使关节阀体输出转角产生回调,碰撞结束后,输出转角又会迅速恢复。为了有效吸收剩余的冲击能量,本文将自适应阻抗控制作为回转关节的主动柔顺控制,与关节的被动柔... 详细信息

双叶片液压被动柔顺回转关节在受到外界环境的碰撞时,关节的被动柔顺性会使关节阀体输出转角产生回调,碰撞结束后,输出转角又会迅速恢复。为了有效吸收剩余的冲击能量,本文将自适应阻抗控制作为回转关节的主动柔顺控制,与关节的被动柔顺控制相结合,实现对关节的主被动联合柔顺控制,增大了回转关节在受到碰撞时的回调角度,能够更好地化解环境碰撞力。同时在关节的控制系统中设计并添加了一个模糊自适应PID(比例-积分-微分)控制器,作为自适应阻抗控制中的位置控制器,能够减小回转关节输出转角恢复后的稳态误差,提高了关节与外界接触时的安全性。

关键词：机械电子工程液压关节模糊PID控制自适应阻抗控制主被动联合柔顺控制

维普期刊数据库博看期刊

寒武纪叶足动物链状心网虫躯干骨板功能形态学研究

在线全文

学校读者我要写书评

暂无评论

古生物学报 2024年第2期63卷 195-206页

作者：赵嘉琳欧强胡世学中国地质大学(北京)早期生命演化实验室北京100083 中国地质调查局成都地质调查中心成都611230

链状心网虫(Cardiodictyon catenulum)是寒武纪澄江生物群中较为常见的叶足动物,其躯干骨板的形态一直存在较大争议。本项研究显示该叶足动物的躯干具有一纵列马鞍状骨板,每个体节具有单一的骨板,每个骨板从背部延伸至躯干两侧。因此该... 详细信息

链状心网虫(Cardiodictyon catenulum)是寒武纪澄江生物群中较为常见的叶足动物,其躯干骨板的形态一直存在较大争议。本项研究显示该叶足动物的躯干具有一纵列马鞍状骨板,每个体节具有单一的骨板,每个骨板从背部延伸至躯干两侧。因此该叶足动物的骨板与其余具有成对或环状分布的躯干骨板的叶足动物存在显著的区别。骨板中央存在一个圆锥形凸起,骨板边缘显著增厚且呈锯齿状。链状心网虫的躯干骨板边缘增厚和鞍点的凸起提升了整体的刚性;锯齿状边缘也指示了更优的保护及防御功能。本项研究还发现链状心网虫骨板表面具有显微筛状结构,筛孔被充填并保存为众多等距离分布的黄铁矿化瘤突,与微网虫、怪诞虫及爪网虫躯干骨板的显微网状结构类似,可能为纤细乳突的出口。本文认为寒武纪叶足动物的躯干骨板普遍具有显微筛状结构;这些骨板除了保护与防御,可能还有感觉的功能。每个躯干体节对应骨板为寒武纪叶足动物的独有衍征,可能为背骨板的早期形态,也可能由成对骨板愈合而来。

关键词：心网虫骨板叶足动物功能形态学寒武纪

中国文化产业链现代化水平测度、空间分异及收敛性研究

在线全文

学校读者我要写书评

暂无评论

当代财经 2024年第10期 123-140页

作者：魏和清胡适中吴磊江西财经大学统计与数据科学学院江西南昌330013

提升文化产业链现代化水平成为推动中国文化产业转型与升级、建设文化强国的重要举措。通过科学界定文化产业链现代化的内涵,提炼文化产业链现代化核心要素,测度2012年至2021年的全国和省域文化产业链现代化水平,利用核密度估计、Dagum... 详细信息

提升文化产业链现代化水平成为推动中国文化产业转型与升级、建设文化强国的重要举措。通过科学界定文化产业链现代化的内涵,提炼文化产业链现代化核心要素,测度2012年至2021年的全国和省域文化产业链现代化水平,利用核密度估计、Dagum基尼系数和收敛模型等方法,探究文化产业链现代化水平的空间分异与收敛性。研究发现:第一,在观测期,全国文化产业链现代化水平总体呈波动上升趋势,文化产业链现代化水平的地区间差异呈缩小趋势。第二,省域文化产业链现代化水平在观测期存在“俱乐部趋同”现象,且收敛过程存在空间挤出效应,低水平地区难以实现向更高发展类型的跃迁。第三,全国文化产业链现代化水平在观测期显著收敛。根据研究结论,应该进一步提升全国文化产业链的创新效能,加强文化产业核心技术的研发,进一步扩大东北和西部地区的数字文化产品市场规模和文化企业基数,优化全国文化资源要素的空间布局,引导区域间文化产业链现代化良性协调发展。

关键词：文化产业链现代化区域发展空间分异收敛性

丹酚酸B对肝损伤小鼠肠道菌群和短链脂肪酸代谢的影响

在线全文

学校读者我要写书评

暂无评论

天然产物研究与开发 2024年第5期36卷 748-754,824页

作者：周喆胡诗安胡雨瞳谭洋裴刚李玲湖南中医药大学药学院湖南省普通高等学校中药现代化重点实验室长沙410208

本研究旨在探讨丹酚酸B(salvianolic acid B,Sal B)对小鼠肝损伤的干预作用,以及对肠道菌群和短链脂肪酸(short-chain fatty acids,SCFAs)代谢的影响。通过皮下注射20%CCl 4溶液建立小鼠肝损伤模型,在造模的同时给予Sal B和阳性药2-脱氧... 详细信息

本研究旨在探讨丹酚酸B(salvianolic acid B,Sal B)对小鼠肝损伤的干预作用,以及对肠道菌群和短链脂肪酸(short-chain fatty acids,SCFAs)代谢的影响。通过皮下注射20%CCl 4溶液建立小鼠肝损伤模型,在造模的同时给予Sal B和阳性药2-脱氧-葡萄糖(2-deoxy-D-glucose)灌胃干预,干预结束后通过苏木素-伊红(hematoxylin-eosin,HE)、Masson、天狼星红染色观察小鼠肝脏病理变化;采用生化试剂盒检测血清谷丙转氨酶(alanine aminotransferase,ALT)、谷草转氨酶(aspartate aminotransferase,AST)水平;运用16S rRNA测序技术检测小鼠肠道菌群结构变化;通过气相色谱法测定小鼠粪便中SCFAs的含量。结果显示,Sal B可以显著降低CCl 4诱导的肝损伤小鼠血清ALT、AST水平(P<0.001),并减轻肝组织病理损伤。测序结果显示,Sal B可以部分恢复肝损伤小鼠的肠道菌群结构,同时显著增加肠道中异丁酸、异戊酸、丙酸和戊酸的含量(P<0.001)。本实验揭示了Sal B可以减轻CCl 4所诱导的小鼠肝损伤,机制可能与其对肠道菌群和SCFAs紊乱的调节有关。

关键词：丹酚酸B 肝损伤肠道菌群短链脂肪酸