检索结果-南通市图书馆

A human-sensitive frequency band vibration isolator for heavy-duty truck seats

Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1733-1748页

作者： Qingqing LIU Shenlong wang Ge YAN Hu DING haihua wang Qiang SHI Xiaohong DING Huijie YU School of Mechanical Engineering University of Shanghai for Science and Technology State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of Mechnoinformatics Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering Science Shanghai University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Yanfeng Adient Seating Co. Ltd. College of Mechanical and Electrical Engineering Jiaxing Nanhu University

In this study, a human-sensitive frequency band vibration isolator(HFBVI)with quasi-zero stiffness(QZS) characteristics for heavy-duty truck seats is designed to improve the comfort of heavy-duty truck drivers on uneven roads. First, the analytical expressions for the force and displacement of the HFBVI are derived with the Lagrange equation and d'Alembert's principle, and are validated through the prototype restoring force testing. Second, the harmonic balance method(HBM) is used to obtain the dynamic responses under harmonic excitation, and further the influence of pre-stretching on the dynamic characteristics and transmissibility is discussed. Finally, the experimental prototype of the HFBVI is fabricated, and vibration experiments are conducted under harmonic excitation to verify the vibration isolation performance(VIP) of the proposed vibration isolator. The experimental results indicate that the HFBVI can effectively suppress the frequency band(4–8 Hz) to which the human body is sensitive to vertical vibration. In addition, under real random road spectrum excitation, the HFBVI can achieve low-frequency vibration isolation close to 2 Hz, providing new prospects for ensuring the health of heavy-duty truck drivers.

关键词： 70L05 heavy-duty truck seat human-sensitive frequency band low-frequency vibration isolation O328 quasi-zero stiffness (QZS) real random road spectrum

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photo-induced tunable luminescence from an aggregated amphiphilic ethylene-pyrene derivative in aqueous media

引用

Chinese Chemical Letters 2024年第6期35卷 303-306页

作者： Junying Zhang Ruochen Li haihua wang Wenbing Kang Xing-Dong Xu National Engineering Research Center for Colloidal Materials Key Laboratory of Special Functional Aggregated Materials of Ministry of EducationShandong Key Laboratory of Advanced Silicone Materials and TechnologySchool of Chemistry and Chemical EngineeringShandong UniversityJi’nan 250100China

An amphiphilic derivative with a large Stokes shift by introducing flexible hydrophilic long chains into a rigid ethylene-pyrene compound have been successfully *** alkylated compound exhibited a notable change in charge distribution,facilitating cation-π *** the process of amphiphilic self-assembly,the formation of highly ordered aggregates enabled effective photo-dimerization under 449 nm LED ***,this photo-responsive technology not only exhibited advanced multi-color emission effects,including white light emission but also exhibited environmentally friendly behavior in the aqueous phase.

关键词： Supramolecular chemistry Amphiphilic assembly Stimuli-responsive materials Tunable luminescence Pyrene derivative

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Water quality and habitat drive phytoplankton taxonomic and functional group patterns in the Yangtze River

引用

Ecological Processes 2024年第1期13卷 144-158页

作者： Wenqi Gao Fangyuan Xiong Ying Lu Wei Xin haihua wang Gangpeng Feng Chiping Kong Lei Fang Xiaoping Gao Yushun Chen State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of Chinese Academy of Sciences Jiangxi Institute for Fisheries Sciences Poyang Lake Fisheries Research Centre of Jiangxi Province East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Jiujiang Institute of Agricultural Sciences

Background Although phytoplankton are important primary producers in food webs, they are relatively less studied in large rivers compared to other types of systems. To fill this research gap, we studied phytoplankton taxonomic and functional composition and their relationships with water quality, habitat, climate, and land use across 30 river sections in the middle and lower reaches of the Yangtze River during 2017–*** Major observed phytoplankton groups were cyanobacteria, bacillariophyta, and chlorophyta. Phytoplankton total abundance, total biomass, and species richness significantly decreased in the dry season compared to the wet season, with the species and functional composition differing significantly between seasons. Phytoplankton species differences between seasons were mainly contributed by Oscillatoria sp., Pseudanabaena sp., and Melosira granulata. The dfferences in phytoplankton functional groups between seasons were mainly contributed by P（including Closterium sp., Melosira sp.）, Lo（including Merismopedia sp., Peridinium sp., Ceratium sp., and Gymnodinium sp.）, and J（including Pediastrum sp., Tetraedron sp., Crucigenia sp., Scenedesmus sp., and Coelastrum sp.）. The variance partitioning showed that water quality（NO3-N, total suspended solids, turbidity） and habitat（water flow, river bank and river channel conditions） were critical factors in shaping phytoplankton patterns, followed by climate and land *** Results indicated that there was significant seasonal variation of phytoplankton in the Yangtze River, with water quality and habitat primarily driving phytoplankton patterns. Our study contributes to the understanding of natural and anthropogenic factors that drive seasonal successional processes of phytoplankton in the Yangtze River. These findings have important implications for environmental management as well as towards the ecological restoration of large rivers.

关键词： Yangtze River Phytoplankton Functional group Water quality Physical habitat

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enteromorpha prolifera polysaccharide-Fe(Ⅲ) complex promotes intestinal development as a new iron supplement

引用

Science China Life Sciences 2024年

作者： Yingying Feng Yuying Wu Jialu wang Zhenglin Dong Qian Yu Shuangshuang Xia Chunxue Liu haihua wang Xin Wu Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences CAS Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical Agriculture Chinese Academy of Sciences ANYOU Biotechnology Group Co.Ltd Qingdao Seawin Biotech Group Co. Ltd

Iron is a crucial micronutrient, and its deficiency can have detrimental effects on the health of infants. Dietary polysaccharide-iron(Ⅲ) complexes(PICs) are promising for addressing iron deficiency due to their minimal adverse reactions and high iron absorption rate. This study aimed to investigate the effects of dietary Enteromorpha prolifera polysaccharide-Fe(Ⅲ) complex(EP-Fe) on newborns, using 3-day weaned piglets as the iron-deficiency model. Results showed that EP-Fe improved iron levels and promoted intestinal development in piglets. Transcriptome sequencing revealed that EP-Fe increased the survival of intestinal epithelial cells under hypoxia by upregulating the expression of genes that promote the development of the vascular system. Additionally, EP-Fe enhanced the mucosal barrier functions by inhibiting myosin light chain kinase(MLCK)/phosphorylated myosin light chain(p-MLC)signaling pathway to increase the expression of intestinal tight junction proteins. Furthermore, the 16S rRNA gene sequencing of gut microbiota showed that EP-Fe promoted the enrichment of Bacteroides＿fragilis and other gut microbes that can metabolize carbohydrates. In conclusion, EP-Fe is an effective iron supplement for newborns, and it can be developed as a comprehensive nutritional supplement.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Novel silver nanoparticles loaded Cu-based metal organic framework as a promising antimicrobial material for controlling Escherichia coli O157:H7 in pork

引用

Food Science and Human Wellness 2024年

作者： Dongbo Yang Jing Yi Xiaoya Li Shuqi Zhang Yiming Xiang Xingxing Liu Zhongguo Shan haihua wang College of Food Science and Engineering， Northwest A&F University

The risk of infection following consumption of foodborne pathogens contaminated foods became a significant concern for human health and imposes great economic losses to food industry. Herein， Ag nanoparticles were integrated to Cu-based metal–organic framework (Cu-MOF) for antibacterial activity. The crystal structure， morphology and composition of the prepared composite Ag@Cu-MOF were confirmed by XRD， TG， SEM， TEM， FTIR and XPS analysis. Antibacterial assays revealed that Ag@Cu-MOF exhibited increased inhibitory activity against Escherichia coli O157:H7 in comparison to Cu-MOF. Ag@Cu-MOF treated bacterial cells displayed distinct morphological changes， a decreased ratio of Live/Dead cells， as well as a reduction of intracellular adenosine 5’-triphosphate (ATP). Antibiofilm studies demonstrated that Ag@Cu-MOF could dramatically inhibit biofilm formation and disrupt preformed biofilms by interfering the metabolic activity and decreasing the expression of biofilm-associated genes. Food contamination model illustrated that Ag@Cu-MOF significantly prevented the growth of E. coli O157:H7 in packed pork. This study sheds light on the potential of Ag@Cu-MOF as a promising antimicrobial material for preserving pork.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

缓蚀型聚邻甲苯胺-氧化石墨烯基防腐材料的制备与性能

引用

复合材料学报 2024年第4期41卷 1900-1913页

作者：王海花叶梦玉费贵强李焱宇王丹丹陕西科技大学化学与化工学院西安710021

为开发缓蚀剂高效利用的新途径,选取氧化石墨烯为基材、聚邻甲苯胺微胶囊为壁材、缓蚀剂2-巯基苯并噻唑为芯材,制备了缓蚀型聚邻甲苯胺-氧化石墨烯基防腐材料,并将其作为填料用于水性环氧树脂涂层(WEP)的改性。通过FTIR、XRD、XPS和SEM... 详细信息

为开发缓蚀剂高效利用的新途径,选取氧化石墨烯为基材、聚邻甲苯胺微胶囊为壁材、缓蚀剂2-巯基苯并噻唑为芯材,制备了缓蚀型聚邻甲苯胺-氧化石墨烯基防腐材料,并将其作为填料用于水性环氧树脂涂层(WEP)的改性。通过FTIR、XRD、XPS和SEM等对材料进行了结构和形貌的表征,采用紫外可见光谱对缓蚀剂的释放行为进行分析,采用万能试验机、电化学测试和盐雾实验对涂层的拉伸性能和防腐性能进行了评价。结果表明:缓蚀剂成功包覆于聚邻甲苯胺微胶囊内部,并通过共价键方式将微胶囊连接在改性氧化石墨烯表面,使缓蚀剂得到了充分利用,提高了涂层的拉伸性能、自修复性能及对腐蚀介质的屏蔽性能。紫外可见光谱测试结果表明,微胶囊在人工破损96 h后,内部缓蚀剂的释放量达78%;拉伸性能测试结果表明,与纯WEP相比,当填料加入量为0.3wt%时,涂层应力从14.281 MPa增加到24.25 MPa;SEM结果表明,被划伤的涂层在常温下放置10 h后自修复;电化学测试和盐雾实验结果表明,涂层腐蚀电位从−0.6216 V提高到−0.1554 V,腐蚀电流密度从4.271×10^(−7)A·cm^(−2)减小到1.016×10^(−11)A·cm^(−2),阻抗模量可达到1.5757×10^(9)Ω·cm^(2),在盐雾500 h后仍表现出较好的防腐性能。

关键词：氧化石墨烯聚邻甲苯胺微胶囊水性环氧树脂防腐涂层

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

服务设计视角下公共空间差异性探析

引用

丝网印刷 2024年第10期 60-62页

作者：王海华中央美术学院

文章探讨了未来文化服务与公共空间,分析服务设计对城市公共空间的影响,强调多元文化服务推动城市发展。

关键词：服务设计公共空间参与文化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

折叠萝卜螺卵粒孵化时间及不同饵料对仔螺生长的影响

引用

上海海洋大学学报 2024年第3期33卷 615-622页

作者：王帅兵熊良伟曹又文宋扬王海华刘波江苏农牧科技职业学院江苏泰州225300 江西省水产科学研究所南昌市特种水产繁育与健康养殖重点实验室江西南昌330039 中国水产科学研究院淡水渔业研究中心农业农村部淡水渔业和种质资源利用重点实验室江苏无锡214081

为了研究折叠萝卜螺(Radix plicatula)卵粒孵化时间和生菜叶、水生生物附着物、微囊料3种饵料及其部分组合对仔螺生长的影响,其中,生长分0~2、3~5周龄2个阶段,在室内条件下,统计10条新产卵袋卵粒孵化时间,分析投喂不同饵料及组合仔螺体... 详细信息

为了研究折叠萝卜螺(Radix plicatula)卵粒孵化时间和生菜叶、水生生物附着物、微囊料3种饵料及其部分组合对仔螺生长的影响,其中,生长分0~2、3~5周龄2个阶段,在室内条件下,统计10条新产卵袋卵粒孵化时间,分析投喂不同饵料及组合仔螺体质量等生长参数差异。结果显示:水温25.0~32.5℃,折叠萝卜螺卵粒孵化时间6.0~7.5 d,平均孵化率96.37%;水温22.5~32.5℃,不同饵料及组合0~5周龄仔螺成活率差异不显著、生长速度差异显著;0~2周龄仔螺投喂水生生物附着物+微囊料生长速度最快,投喂水生生物附着物次之;初始体质量0.005 g的3~5周龄仔螺投喂生菜叶+微囊料生长速度显著快于生菜叶和微囊料;初始体质量0.026 g的3~5周龄仔螺投喂生菜叶和生菜叶+微囊料生长速度快,之间差异不显著。研究表明:水温25.0~32.5℃,折叠萝卜螺卵粒孵化时间6.0~7.5 d,平均孵化率96.37%;0~2周龄仔螺投喂水生生物附着物生长速度快,3~5周龄螺投喂生菜叶生长速度快,同时投喂微囊料对0~5周龄螺有促生长作用。本研究可为折叠萝卜螺规模化生产提供依据。

关键词：折叠萝卜螺孵粒孵化饵料开发生长成活率

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

日本浅表层水合物勘查试采进展

引用

中国地质调查 2024年第3期11卷 117-126页

作者：张炜邵明娟王海华姚树青中国地质调查局地学文献中心北京100083 中国地质图书馆北京100083

海洋孔隙填充型水合物已得到较广泛资源调查和经过数次试采,与之相比,以赋存于冷泉、泥底辟和泥火山附近的海底表面和近海底沉积物为主的浅表层水合物的勘查试采工作刚刚起步。日本作为最早实施水合物勘查试采的国家之一,自2013财政年... 详细信息

海洋孔隙填充型水合物已得到较广泛资源调查和经过数次试采,与之相比,以赋存于冷泉、泥底辟和泥火山附近的海底表面和近海底沉积物为主的浅表层水合物的勘查试采工作刚刚起步。日本作为最早实施水合物勘查试采的国家之一,自2013财政年以来在浅表层水合物的资源勘查评价、海洋区域地质调查和环境调查、开发技术调研评价、生产系统构建等方面取得了显著进展。基于文献资料调研,概述了日本水合物研发工作的发展历程以及对浅表层水合物研发工作的整体部署,详细介绍了日本在浅表层水合物勘查试采相关领域开展的主要工作,分析认为,日本在如下4方面取得的实际经验和理论认识值得我国浅表层水合物勘查试采体系化部署借鉴参考:以日本海为主的区域性资源和环境调查,以小范围区域为对象的资源量评价示范,以试采场地优选为目标的精细化资源和环境调查,以及“以使用大口径钻头的大范围垂直采掘方法为基础、优先考虑气体举升回收方法和船载分离方法两项关键技术以形成最优组合”的生产系统设计原则的评估确立。

关键词：甲烷水合物资源勘查环境调查勘查试采产业化

来源：

维普期刊数据库

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

数字化变革背景下技术多元化对企业韧性的影响

引用

系统管理学报 2024年第2期33卷 391-403页

作者：王海花李雅洁李烨龚燕燕上海大学管理学院上海200444

基于资源基础理论,聚焦企业韧性的稳定性和灵活性特征,探讨数字化变革背景下技术多元化与企业韧性的关系。利用2018~2022年新冠疫情冲击前后中国上市高新技术企业的数据,采用OLS回归和生存分析法进行实证分析。结果表明:非相关技术多元... 详细信息

基于资源基础理论,聚焦企业韧性的稳定性和灵活性特征,探讨数字化变革背景下技术多元化与企业韧性的关系。利用2018~2022年新冠疫情冲击前后中国上市高新技术企业的数据,采用OLS回归和生存分析法进行实证分析。结果表明:非相关技术多元化和相关技术多元化均与企业受到冲击后的稳定性呈倒U型关系;非相关技术多元化负向影响企业受到冲击后的灵活性,而相关技术多元化正向影响企业受到冲击后的灵活性;数字化变革加强了相关技术多元化与企业受到冲击后稳定性间的倒U型关系,并削弱了非相关技术多元化对企业受到冲击后灵活性的抑制作用。研究结论丰富和拓展了技术多元化与企业韧性的相关研究,为企业制定合适的技术多元化战略以增强韧性提供参考。

关键词：非相关技术多元化相关技术多元化企业韧性数字化变革

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：