检索结果-南通市图书馆

Dual Strengthened Control of Recrystallization Behavior on CVCDE Magnesium Alloy Containing Characteristic Structure

引用

Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1805-1821页

作者： Nan Bian Feng Li wentao niu Chao Li Yuanqi Li School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin150040China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin150080China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification and Green Forming Technology Harbin University of Science and TechnologyHarbin150040China

Various characteristic structures in typical magnesium alloys,including dislocation cells,substructures and twins,have an important influence on the dynamic recrystallization behavior,and the DRX(dynamic recrystallization)behavior is closely related to the grain refinement and texture weakening of the hot deformed structure.Therefore,this study reveals the influence of the above characteristic structures on the dynamic recrystallization behavior of magnesium alloys,which have great significance for regulating the high-performance hot deformed microstructure of magnesium alloys and optimizing the macro mechanical properties.In this study,continuous variable channel direct extrusion(CVCDE)magnesium alloy was prepared by CVCDE,and its macro mechanical properties including hardness and uniaxial tension were characterized.The thermoplastic deformation behavior and texture evolution of magnesium alloy with characteristic structure were analyzed by electron back-scattering diffraction technology.It is found that the dislocation recombination was realized by deformation mechanism(slip,climb and cross slip),the formation of grain substructure in coarse grains and the induction of recrystallization by twins promote the recrystallization behavior in hot deformed structures more adequate,which effectively improves the degree of microstructure refinement and deformation uniformity.

关键词： Characteristic structure Continuous variable channel direct extrusion(CVCDE) Dynamic recrystallization Regulation Mechanical property

来源：

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

Next-generation sequencing revealed specific microbial symbionts in Porites lutea with pigment abnormalities in North Sulawesi, Indonesia

引用

Acta Oceanologica Sinica 2018年第12期37卷 78-84页

作者： OU Danyun CHEN Bin HADI Tri Aryono SUHARSONO NIU Wentao ALFIANSAH Yustian Rovi Third Institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences

Bacterial diseases affecting corals pose an enormous threat to the health of coral reefs. The relationship between certain bacterial species and coral diseases remain largely unknown. Pigment abnormalities are common in Porites lutea. Here we used Illumina 16S rRNA gene sequencing to analyze the bacterial communities associated with healthy P. lutea and P. lutea with pigment abnormalities. We observed an increase of alpha diversity of the bacterial community of P. lutea with pigment abnormalities, relative to healthy corals. We then identified changes in the abundance of individual operational taxonomic units(OTUs) between pigmented and healthy corals. We were able to identify eight OTUs associated with pigment abnormalities, which are possibly the causative agents of pigment abnormalities.

关键词： Porites lutea pigment abnormalities next-generation sequencing 16S rRNA bacterial diversity

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

Preliminary study on community structures of meiofauna in the middle and eastern Chukchi Sea

引用

Acta Oceanologica Sinica 2021年第6期40卷 83-91页

作者： Dingyong Huang Jianjia Wang Qianhui Zeng Jiaguang Xiao Peng Tian Sujing Fu Feng Guo wentao niu Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Ocean College Shandong UniversityWeihai 264209China Key Laboratory of the Coastal and Wetland Ecosystem of Ministry of Education Xiamen UniversityXiamen 361005China

Sediment core samples were collected from 17 stations in the middle and eastern Chukchi Sea during the sixth Chinese National Arctic Research Expedition(CHINARE-Arctic)in summer 2014.The samples were analyzed for composition,abundance,biomass,vertical distribution,size spectra,and ecological indexes of meiofauna.A total of 14 meiofauna taxa were detected,and the free-living marine nematodes comprised the most dominant taxon,accounting for 97.21%of the average abundance.The abundance and biomass of meiofauna were within ranges of(218.12±85.83)-(7239.38±1557.15)ind./(10 cm^(2))and(130.28±52.17)-(3309.56±1751.80)μg/(10 cm^(2)),with average values of(2391.90±1966.19)ind./(10 cm^(2))and(1549.73±2042.85)μg/(10 cm^(2))(according to dry weight)respectively.Furthermore,91.26%of the individuals were distributed in the top layer of 0-5 cm of surface sediment,and 90.84%had sizes of 32-250μm.Group diversity index of meiofauna in the survey area was low,and the variation of abundance was the main difference in meiofauna communities among all stations.Abundance and biomass of meiofauna were not significantly correlated with environmental factors except concentration of nutrient Si in bottom seawater.Abundance of meiofauna in shallow water of marginal seas in the Pacific sector of the Arctic Ocean is likely at a same level and higher than that in most of China sea areas,suggesting that the shallow water of the summer Chukchi Sea is a continental shelf area with rich resources of meiofauna.The Chukchi Sea is important for studying the ecosystem of the Arctic Ocean and environmental responses.However,studies on meiofauna in the Chukchi Sea are still not enough,and in the future,natural and human disturbances may increase due to global warming,the Arctic channel opening,and other factors.Thus,more studies on meiofauna should be required,in order to know more about how the Arctic benthic community would alter.

关键词： Arctic Ocean Chukchi Sea meiofauna community structure abundance

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

流动的现代性社会中新闻伦理的理念反思与维度重构

引用

新闻界 2023年第11期 23-32页

作者：牛静胡文韬华中科技大学新闻与信息传播学院湖北武汉430074

流动的现代性社会打破了线性的社会组织结构和稳定的时空坐标,导致既有的秩序与规范加速液化。在此社会现实下,新闻业也呈现出流动性特征,表现为衣帽间式共同体建构复合型新闻生产场域、数字化转型升级再塑新闻生产流程、时空压缩形成... 详细信息

流动的现代性社会打破了线性的社会组织结构和稳定的时空坐标,导致既有的秩序与规范加速液化。在此社会现实下,新闻业也呈现出流动性特征,表现为衣帽间式共同体建构复合型新闻生产场域、数字化转型升级再塑新闻生产流程、时空压缩形成全球性的流动新闻实践。这些变化带来了复杂而又多变的伦理道德问题,究其原因是传统新闻伦理以职业封闭性、条例规则性和标准普适性为建构逻辑,在多重流变的传播语境下缺乏实践的解释力和规制的约束力。所以可以将建构开放的、动态的、可对话的新闻伦理视为伦理建构的一个思考路径,以此来协调流动的现代性社会中新闻实践的主体、技术与多元文化间的关系。

关键词：新闻伦理流动性现代性维度重构

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

中国城市化进程的“S”型演变及政策效应评价——基于Logistic模型的实证研究

引用

现代城市研究 2017年第5期32卷 75-81页

作者：牛文涛郑州大学房地产市场研究中心

基于Logistic模型,并利用相关城市化数据,本文对我国城市化进程与饱和水平S、初始水平a和速度指标b的内在关系以及城市化进程"S"型演变的影响因素进行了实证研究。结果表明:(1)城市化的饱和水平S确定了城市化进程的上限,城市化的初始水... 详细信息

基于Logistic模型,并利用相关城市化数据,本文对我国城市化进程与饱和水平S、初始水平a和速度指标b的内在关系以及城市化进程"S"型演变的影响因素进行了实证研究。结果表明:(1)城市化的饱和水平S确定了城市化进程的上限,城市化的初始水平a和速度指标b的大小则决定了城市化进程的实现周期;(2)城市化进程的"S"型趋势受到政策变革的干扰,并通过影响速度指标b的大小引致城市化进程的加速或者停滞过程;(3)城市化本质上可视作一个多维度的系统演变过程,主要包括了时间维度、空间维度和城市化系统本身。

关键词：城市化饱和水平城市蔓延城市化阶段

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

SMW工法在软土基坑支护工程中的应用

引用

勘察科学技术 2023年第6期 25-28,34页

作者：牛文韬中国地质大学(武汉)工程学院武汉市430074

SMW工法是一种新型施工技术,能够明显降低工程造价,提高支护能力,缩短工期。该文以东南沿海某软土地区的基坑支护工程为例,对SMW工法的应用效果进行探讨分析。该工程的支护方案主要为"SMW工法桩+坑底加固+竖向斜撑",先对基坑支护工程周... 详细信息

SMW工法是一种新型施工技术,能够明显降低工程造价,提高支护能力,缩短工期。该文以东南沿海某软土地区的基坑支护工程为例,对SMW工法的应用效果进行探讨分析。该工程的支护方案主要为"SMW工法桩+坑底加固+竖向斜撑",先对基坑支护工程周围的环境、地质和水文条件进行分析,再设计不同的基坑支护方案,通过实际的基坑支护施工应用,分析SMW工法的应用效果,期望为大面积软土基坑支护设计工作提供有益的参考。

关键词： SMW工法软土基坑支护

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

Bio-inspired, bio-degradable adenosine 5′ -diphosphate-modified hyaluronic acid coordinated hydrophobic undecanal-modified chitosan for hemostasis and wound healing

引用

Bioactive Materials 2022年第11期7卷 162-177页

作者： Yihao Liu Haoyi niu Chengwei Wang Xiaoxiao Yang wentao Li Yuxin Zhang Xiaojun Ma Yuanjing Xu Pengfei Zheng Jinwu Wang Kerong Dai Shanghai Key Laboratory of Orthopedic Implant Department of Orthopedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineNo.639 Zhizaoju RdShanghai200011China Department of Orthopaedic Surgery Children’s Hospital of Nanjing Medical UniversityNo.72 Guangzhou RdNanjing210008China Department of Rehabilitation Huashan HospitalFudan UniversityNo.12 Middle Urumqi RdShanghai200040China Med-X Research Institute School of Biomedical EngineeringShanghai Jiao Tong UniversityNo.1956 Huashan RdShanghai200030China Department of Orthopedics Shanghai General HospitalShanghai Jiao Tong University School of MedicineNo.85 Wujin RdShanghai200080China

Uncontrolled hemorrhage and wound infection are crucial causes of trauma-associated death in both the military and the clinic. Therefore, developing an efficient and rapid hemostatic method with biocompatibility, easy degradation, and wound healing is of great importance and desirability. Inspired by spontaneous blood cell plug formation in the hemostasis process, an adenosine 5′-diphosphate modified pro-coagulation hyaluronic acid (HA-ADP) coordinated with enhanced antibacterial activity of undecanal-modified chitosan (UCS) was fabricated through physical electrostatic cross-linking and freeze-drying. The as-prepared hydrogel sponges showed a porous structure suitable for blood cell adhesion. In particular, the hydrogel exhibited excellent antibacterial ability and promoted the adhesion of platelets and red blood cells, thus inducing a prominent pro-coagulation ability via platelet activation, which exhibits a shorter hemostasis time (58.94% of control) in vitro. Compared with commercially available CELOX and gelatin sponge (GS), HA-ADP/UCS accelerates hemostasis and reduces blood loss in both rat tail amputation and rat artery injury models. Furthermore, all the samples exhibited su-perior cytocompatibility and biodegradability. Due to these performances, HA-ADP/UCS promoted full-thickness skin defect healing significantly in vivo. All the properties of HA-ADP/UCS suggest that it has great potential for translation as a clinical application material for hemostatic and wound healing.

关键词： Hemostasis Antibacterial Wound healing Hyaluronic acid Chitosan

来源：

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

circRNAs deregulation in exosomes derived from BEAS-2B cells is associated with vascular stiffness induced by PM_(2.5)

引用

Journal of Environmental Sciences 2024年第3期137卷 527-539页

作者： Qingping Liu Yaling Zhang Bin Han Mengruo Wang Huaifang Hu Jie Ning wentao Hu Meiyu Chen Yaxian Pang Yuanyuan Chen Lei Bao Yujie niu Rong Zhang Department of Toxicology Hebei Medical UniversityShijiazhuang 050017China State Key Laboratory of Environment Health(Incubation) Key Laboratory of Environment and HealthMinistry of EducationKey Laboratory of Environment and Health(Wuhan)Ministry of Environmental ProtectionSchool of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China Occupational Health and Environmental Health Hebei Medical UniversityShijiazhuang 050017China Hebei Key Laboratory of Environment and Human Health Hebei Medical UniversityShijiazhuang 050017China

As an environmental pollutant,ambient fine particulate matter (PM_(2.5)) was linked to cardiovascular diseases.The molecular mechanisms underlying PM_(2.5)-induced extrapulmonary disease has not been elucidated clearly.In this study the ambient PM_(2.5)exposure mice model we established was to explore adverse effects of vessel and potential mechanisms.Long-term PM_(2.5)exposure caused reduced lung function and vascular stiffness in mice.And chronic PM_(2.5)induced migration and epithelial-mesenchymal transition (EMT) phenotype in BEAS-2B cells.After PM_(2.5)treatment,the circRNAs and mRNAs levels of exosomes released by BEAS-2B cells were detected by competing endogenous RNA (ceRNA) array,which contained 1664 differentially expressed circRNAs (DE-circRNAs) and 308 differentially expressed m RNAs (DE-mRNAs).By bioinformatics analysis on host genes of DE-circRNAs,vascular diseases and some pathways related to vascular diseases including focal adhesion,tight junction and adherens junction were enriched.Then,ceRNA network was constructed,and DE-mRNAs in ceRNA network were conducted functional enrichment analysis by Ingenuity Pathway Analysis,which indicated that hsa_circ_0012627,hsa_circ_0053261and hsa_circ_0052810 were related to vascular endothelial dysfunction.Furthermore,it was verified experimentally that Exo^(PM2.5)could induce endothelial dysfunction by increased endothelial permeability and decreased relaxation in vitro.In present study,we investigated in-depth knowledge into the molecule events related to PM_(2.5) toxicity and pathogenesis of vascular diseases.

关键词： Fine particulate matter Vascular stiffness Exosome ceRNA microarray Endothelial dysfunction

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

“双循环”格局下旅游新业态的培育逻辑

引用

贵州社会科学 2022年第3期 118-124页

作者：杜书云牛文涛郑州大学文化旅游创意产业研究院河南郑州450001

旅游产业是满足人们对美好生活追求的综合性服务产业。以构建新发展格局为指向的旅游产业高质量发展,应当聚焦于旅游产业关联效应的充分发挥,以旅游新业态创新、培育和持续运营为关键手段,持续促进旅游产业与其他产业之间的深度融合,不... 详细信息

旅游产业是满足人们对美好生活追求的综合性服务产业。以构建新发展格局为指向的旅游产业高质量发展,应当聚焦于旅游产业关联效应的充分发挥,以旅游新业态创新、培育和持续运营为关键手段,持续促进旅游产业与其他产业之间的深度融合,不断推动旅游产业的转型升级和“提质增效”。旅游产业融合与业态创新的内在动力源于旅游业的无边界性和强关联性等特点,而其外在动力则由市场需求推力、合作竞争压力以及技术创新拉力三个维度进行揭示。旅游新业态的创新、培育和运营过程也是旅游产业边界分离、重构和融合的过程,通过要素之间的融合与重组,将逐步实现旅游产业与其他关联产业边界的交融和围合,最终将赋能我国旅游产业高质量发展。

关键词：双循环旅游高质量产业转型新业态

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

Seedling defoliation of cereal crops increases peanut growth and yield in an intercropping system

引用

The Crop Journal 2022年第2期10卷 418-425页

作者： Bo Huang Xiaojin Zou Huasen Xu Jiayi Xu Huiyu Liu wentao Sun Liang Gong Shiwei niu Liangshan Feng Ning Yang Lizhen Zhang Zhanxiang Sun College of Land and Environment Shenyang Agricultural UniversityShenyang 110866LiaoningChina Center of International Cooperation Service Ministry of Agriculture and Rural AffairsBeijing 100125China Institute of Plant Nutrient and Environmental Resources Liaoning Academy of Agricultural SciencesShenyang 110161LiaoningChina Beijing Key Laboratory of Biodiversity and Organic Farming College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China

Intercropping cereals and legumes is practiced widely in the world for improving yields and economic benefits. Shorter legume crops in intercropping are shaded by taller cereals, substantially reducing legume growth and yield. Reducing shade in intercropping by shortening the plant height of cereals by seedling defoliation has been proposed as a practical approach to increase crop yields and land productivity. A two-year field experiment was conducted to investigate the effect of defoliation of cereal crops at seedling stage on the growth and yield of peanut(Arachis hypogaea L.) intercropped with corn(Zea mays L.) or millet(Setaria italica L.). In comparison with non-defoliation controls, defoliation reduced final plant height by 29 cm on average for corn and 18 cm for millet. Photosynthetically active radiation on peanut in intercropping systems with corn or millet intercropping was respectively 27.0% and 22.8% higher than those in controls, significantly improving the light environment of intercropped peanut. Net photosynthetic rates of peanut were on average 25.5% higher in corn and peanut intercropping and 19.6% higher in millet and peanut intercropping than those in non-defoliation controls. Total biomass of intercropped peanut increased owing to increased root growth. Across two years, yield of peanut intercropped with corn was 27.7% and with millet 32.8% higher than those of controls. Defoliation of cereal crops did not affect corn yield but significantly decreased millet yield by 24.5%. Our results suggest that applying seedling defoliation in intercropped corn could increase peanut yield without compromising corn yield in an intercropping system.

关键词： Plant height Strip intercropping Corn Growth Root

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：