检索结果-南通市图书馆

Stretching Elasticity and Flexibility of Single Polyformaldehyde Chain

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第4期40卷 333-337页

作者： Jin-Xia Yang Hu-Jun Qian Zheng Gong Zhong-Yuan Lu Shu-xun cui Key Laboratory of Advanced Technologies of Materials(Ministry of Education) Southwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical ChemistryJilin UniversityChangchun 130023China School of Life Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

In this work,the single-chain elasticity of polyformaldehyde(POM)is studied,for the first time,by employing atomic force microscopy(AFM)-based single molecule force spectroscopy(SMFS).We find that the single-chain elasticity of POM in a nonpolar organic solvent(nonane)can be described well by a theoretical model(QM-FRC model),when the rotating unit length is 0.144 nm(C―O bond length).After comparison,POM is more flexible than polystyrene(a typical polymer with C―C backbone)at the single-chain level,which is reasonable since the C―O bond has a lower rotation barrier than C―C *** result indicates that the flexibility of a polymer chain can be tuned by the C―O bond proportion in backbone,which casts new light on the rational design of new synthetic polymers in the future.

关键词： Polyformaldehyde Single molecule force spectroscopy Inherent elasticity Flexibility QM-FRC model

Distribution and dynamics of niche and interspecific association of dominant phytoplankton species in the Feiyun River basin,Zhejiang,China

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第4期42卷 1157-1172页

作者： Shengnan ZHU Zengchuan DONG Guobin FU Shujun WU Jinyu MENG Weilin LIU Yupeng LIU xun cui Yuejiao ZHOU College of Hydrology and Water Resources Hohai UniversityNanjing 210098China CSIRO Environment Private Bag 5Wembley WA 6913Australia Department of Agricultural and Biological Engineering Indian River Research and Education CenterUniversity of FloridaFort Pierce 34945USA Jiangxi Provincial Key Laboratory of Hydrology-Water Resources and Water Environment Nanchang Institute of TechnologyNanchang 330099China

To investigate the dominant species and interspecific association in the phytoplankton community of the Feiyun River basin in Zhejiang Province,East China,the main stream and the Shanxi Zhaoshandu Reservoir in the downstream were chosen as the study area,for which 22 sampling sites were *** was conducted in September 2021,January,May,and July *** species were identified from both quantitative samples and in-vivo *** was quantified by direct *** show that there were 98 species belonging to 6 phyla and 78 *** addition,to clarify the niches of the dominant phytoplankton species and their interspecific association,the dominance index was calculated,and a comprehensive analysis was conducted including niche width,niche overlap value,ecological response rate,overall association,chi-square test,and the *** phytoplankton community exhibited characteristics of a Cyanobacteria-Chlorophyta-Diatom type community,showing higher diversity in spring and lower diversity in *** 11 dominants phytoplankton species from 3 phyla,both frequency and dominance degree varied seasonally,of which Microcystis *** the dominant species in Spring,Autumn,and *** niche widths of the dominant species ranged from 0.234 to 0.933,and were categorized into three *** niche overlap values of the 11 dominant species ranged from 0.359 to 0.959,exhibiting significant seasonal differences-highest in winter followed by autumn,spring,and summer in *** overall correlation among dominant species in all four seasons revealed a non-significant negative association,resulting in an unstable community structure.A significant portion(84.2%)of species pairs displayed positive associations,suggesting a successional pattern where Diatoms dominated while other dominant species shared resources and *** this pattern,stability measurements indicated that the dominant species community remained unstable.T

关键词： phytoplankton dominant species niche interspecific association Feiyun River basin

Photothermal‐boosted polaron transport in Fe_(2)O_(3)photoanodes for efficient photoelectrochemical water splitting

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2023年第9期5卷 38-48页

作者： Xiaoqin Hu Jing Huang Yu Cao Bing He xun cui Yunhai Zhu Yang Wang Yihuang Chen Yingkui Yang Zhen Li Xueqin Liu State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhanHubeiChina Faculty of Materials Science and Chemistry China University of GeosciencesWuhanHubeiChina College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouZhejiangChina

Introduction of the photothermal effect into transition-metal oxide photoanodes has been proven to be an effective method to improve the photoelectrochemical(PEC)water-splitting ***,the precise role of the photothermal effect on the PEC performance of photoanodes is still not well ***,spinel-structured ZnFe_(2)O_(4)nanoparticles are deposited on the surface of hematite(Fe_(2)O_(3)),and the ZnFe_(2)O_(4)/Fe_(2)O_(3)photoanode achieves a high photocurrent density of 3.17 mA cm^(-2)at 1.23 V versus a reversible hydrogen electrode(VRHE)due to the photothermal effect of ZnFe_(2)O_(4).Considering that the hopping of electron small polarons induced by oxygen vacancies is thermally activated,we clarify that the main reason for the enhanced PEC performance via the photothermal effect is the promoted mobility of electron small polarons that are bound to positively charged oxygen *** the synergistic effect of oxygen vacancies and the photothermal effect,the electron conductivity and PEC performance are significantly improved,which provide fundamental insights into the impact of the photothermal effect on the PEC performance of small polaron-type semiconductor photoanodes.

关键词： Fe_(2)O_(3)nanorods oxygen vacancies photoelectrochemical performance photothermal effect small polaron transport

生物大分子的单分子力谱:在水溶液与非极性溶剂中的对照研究

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

高分子学报 2016年第9期26卷 1160-1165页

作者：崔树勋材料先进技术教育部重点实验室西南交通大学成都610031

生物大分子是构成生命的物质基础,在其天然环境——水溶液中一般以精确的超分子结构存在.迄今,人们已经合成了种类繁多的水溶性高分子.然而,鲜有合成高分子能够在水溶液中完成精确的超分子组装.与合成高分子相比,生物大分子是特殊而神奇... 详细信息

生物大分子是构成生命的物质基础,在其天然环境——水溶液中一般以精确的超分子结构存在.迄今,人们已经合成了种类繁多的水溶性高分子.然而,鲜有合成高分子能够在水溶液中完成精确的超分子组装.与合成高分子相比,生物大分子是特殊而神奇的.为了研究生物大分子与水的相互作用,近年来作者以单分子力谱为主要的实验方法,开展了生物大分子在水溶液与非极性溶剂中的对照研究.研究表明,在非极性溶剂中,生物大分子的超分子结构失稳,转变为无超分子结构的状态.水是一个重要的开关,调控着生物大分子的超分子结构和功能.作者据此提出了生物大分子的水环境适应性概念和早期化学进化过程中水环境筛选生物大分子的假说,并认为水环境适应性是生物大分子和合成水溶性高分子的分水岭.对水和生物大分子的深入研究,将有望破解生命的更多奥秘.

关键词：原子力显微镜单分子力谱生物大分子水环境化学进化

Heterostructural NiFeW disulfide and hydroxide dual‐trimetallic core‐shell nanosheets for synergistically effective water oxidatio

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第8期6卷 192-204页

作者： Peng‐Fei Guo Yang Yang Bing Zhu Qian‐Nan Yang Yan Jia Wei‐Tao Wang Zhao‐Tie Liu Shi‐Qiang Zhao xun cui Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and TechnologyXi'anChina School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi'anChina Key Laboratory of Carbon Materials of Zhejiang Province Wenzhou Key Lab of Advanced Energy Storage and ConversionZhejiang Province Key Lab of Leather EngineeringCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhanChina

A stable and highly active core‐shell heterostructure electrocatalyst is essential for catalyzing oxygen evolution reaction(OER).Here,a dual‐trimetallic core‐shell heterostructure OER electrocatalyst that consists of a NiFeWS_(2) inner core and an amorphous NiFeW(OH)_(z)outer shell is designed and synthesized using in situ electrochemical *** electrochemical measurements of different as‐synthesized catalysts with a similar mass loading suggest that the core‐shell Ni_(0.66)Fe_(0.17)W_(0.17)S_(2)@amorphous NiFeW(OH)_(z) nanosheets exhibit the highest overall performance compared with that of other bimetallic reference catalysts for the ***,the nanosheet arrays were in situ grown on hydrophilic‐treated carbon paper to fabricate an integrated three‐dimensional electrode that affords a current density of 10 mA cm^(−2) at a small overpotential of 182 mV and a low Tafel slope of 35 mV decade^(−1) in basic *** Faradaic efficiency of core‐shell Ni_(0.66)Fe_(0.17)W_(0.17)S_(2)@amorphous NiFeW(OH)_(z) is as high as 99.5% for *** scanning electron microscope,transmission electron microscope,and X‐ray photoelectron spectroscopy analyses confirm that this electrode has excellent stability in morphology and elementary composition after long‐term electrochemical ***,density functional theory calculations further indicate that the core‐shell heterojunction increased the conductivity of the catalyst,optimized the adsorption energy of the OER intermediates,and improved the OER *** study provides a universal strategy for designing more active core‐shell structure electrocatalysts based on the rule of coordinated regulation between electronic transport and active sites.

关键词： amorphous NiFeW hydroxide core‐shell heterojunction in situ electrochemical tuning NiFeW disulfide oxygen evolution reaction

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

一种基于偏好的多目标调和遗传算法(英文)

软件学报 2005年第5期16卷 761-770页

作者：崔逊学林闯南京大学计算机软件新技术国家重点实验室清华大学计算机科学与技术系

最近涌现了各种进化方法来解决多目标优化问题,多数方法使用Pareto优胜关系作为选择策略而没有采用偏好信息.这些算法不能有效处理目标数目许多时的优化问题.通过在不同准则之间引入偏好来解决该问题,提出一种多目标调和遗传算法MOCGA(m... 详细信息

最近涌现了各种进化方法来解决多目标优化问题,多数方法使用Pareto优胜关系作为选择策略而没有采用偏好信息.这些算法不能有效处理目标数目许多时的优化问题.通过在不同准则之间引入偏好来解决该问题,提出一种多目标调和遗传算法MOCGA(multi-objective concordance genetic algorithm).当同时待优化的目标数目增加时,根据决策者提供的信息使用弱优胜关系进行个体优劣的比较.这种算法被证明为能收敛至全局最优.对于目标数目为很多的优化问题,测试实验结果表明了这种新算法的有效性.

关键词：遗传算法多目标优化偏好信息多准则决策

一种不确定条件下的多目标流水车间调度优化算法

在线全文

学校读者我要写书评

暂无评论

模式识别与人工智能 2009年第1期22卷 101-107页

作者：周强崔逊学南京工业大学信息科学与工程学院南京210009 滁州学院计算机科学与技术系滁州239012 中国人民解放军炮兵学院合肥230031

实际中大多数生产调度问题具有多目标优化的性质,本文讨论在不确定加工时间和机器故障的情况下,如何优化多目标流水车间调度问题.首先设计最大流程时间和最大延迟时间两类指标的求解方法,在此基础上提出一种多目标遗传算法,用来迭代求... 详细信息

实际中大多数生产调度问题具有多目标优化的性质,本文讨论在不确定加工时间和机器故障的情况下,如何优化多目标流水车间调度问题.首先设计最大流程时间和最大延迟时间两类指标的求解方法,在此基础上提出一种多目标遗传算法,用来迭代求解不确定条件下两类目标的最优化问题.模拟实验的结果表明,本文算法方案可较好解决不确定条件下的流水车间调度问题.

关键词：不确定性流水车间调度多目标优化遗传算法

Roles of endothelin-1 and JNK signaling pathway on hypoxia-induced ANP release in beating rabbit atria

在线全文

学校读者我要写书评

暂无评论

Roles of endothelin-1 and JNK signaling pathway on hypoxia-i...

Two new diterpene and sesquiterpene from Pteris dispar

中国生理学会第十届全国青年生理学工作者学术会议

作者：洪兰 Delai Qiu xun cui 吉林省延边大学医学院生理学与病理生理学教研部 Department of physiology Yanbian University

＜正＞Aim:As a cardiac hormone,ANP synthesized and stored primarily in the cardiac *** factors are closely related to the regulation of atrial ANP secretion.A dramatic increase of ANP release is produced by cardiac ischemia and *** several studies have indicated that hypoxia is related with atrial ANP secretion not only in vivo but also in ***,the mechanism by which

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第12期22卷 1451-1453页

作者： Zhan Ping Gou Nian Ci Liang Jie Hou Li Li Yan Tian Chang Yuan Wang xun cui Bao Jing Zhang Xiao Chi Ma Guangdong Key Laboratory of Research and Development of Natural Drugs Guangdong Medical CollegeZhanjiang 524023China School of Pharmacy Dalian Medical UniversityDalian 116044China Department of Oriental Pharmacy Woosuk UniversityWanju-gunJeonbuk 565-701Republic of Korea

A new diterpene and a new sesquiterpene were isolated from Pteris dispar and identified on the basis of spectral data including 2D *** 1 and 2 showed potent cytotoxic activity against KB cell.

关键词： Pteris dispar ent-Kaurane Sesquiterpenoid