检索结果-南通市图书馆

Molecular levers enable anomalously enhanced strength and toughness of cellulose nanocrystal at cryogenic temperature

引用

Nano Research 2023年第5期16卷 8036-8041页

作者： YuanZhen Hou Jun Xia zezhou he YinBo Zhu hengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013China

The quest for widespread applications especially in extreme environments accentuates the necessity to design materials with robust mechanical and thermodynamic *** all existing materials yield temperature-variant mechanical properties,essentially determined by their different atomic bonding *** general,weak non-covalent interactions are considered to diminish the structural anti-destabilization of covalent crystals despite the toughening ***,starting from multiscale theoretical modeling,we herein reveal an anomalous stabilizing effect in cellulose nanocrystals(CNCs)by the cooperation between the non-covalent hydrogen bonds and covalent glucosidic skeleton,namely molecular levers(MLs).It is surprising to find that the hydrogen bonds in MLs behave like covalent bindings under cryogenic conditions,which provide anomalously enhanced strength and toughness for *** analyses demonstrate that the unique dynamical mechanical behaviors from ambient to deep cryogenic temperatures are synergetic results of the intrinsic temperature dependence veiled in MLs and the overall thermo-induced CNC destabilization/*** the consequence,the variation trend of mechanical strength exhibits a bilinear temperature dependence with~77 K as the turning *** underlying investigations not only establish the bottom–up interrelations from the hydrogen bonding thermodynamics to the crystal-scale mechanical properties,but also facilitate the potential application of cellulose-based materials at extremely low temperatures such as those in outer space.

关键词： cellulose nanocrystal molecular lever thermodynamic stability thermo-mechanical behavior cryogenic temperature

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

Multiscale mechanics of noncovalent interface in graphene oxide layered nanocomposites

引用

Theoretical & Applied Mechanics Letters 2022年第1期12卷 3-9页

作者： zezhou he YinBo Zhu hengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Noncovalent interfaces play a vital role in inelastic deformation and toughening mechanisms in layered nanocomposites due to their dynamical recoverability. When interfacial engineering is applied to design layered nanocomposites, shear-lag analysis is usually implemented to evaluate the capability of interfacial loading transfer. here, we introduce a multiscale shear-lag model that correlates macroscale mechanical properties with the molecular mechanisms to quantify the effects of interfacial configuration in graphene oxide(GO) layered nanocomposites. By investigating the mechanical responses of commensurate and incommensurate interfaces, we identify that the commensurate interface exhibits a pronounced size effect due to the nucleation and propagation of interfacial defects, whereas the incommensurate interface displays uniform deformation. Our predictions are further validated through large-scale molecular dynamics simulations for GO layered nanocomposites. This work demonstrates how size effects and interfacial configurations can be exploited to fabricate layered nanocomposites with superior mechanical properties despite relying on weak noncovalent interfaces.

关键词： Multiscale mechanics Noncovalent interface Commensurate and incommensurate Shear-lag model Layered nanocomposites

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

An integrated framework for automatic green building evaluation:A case study of China

引用

Frontiers of Engineering Management 2024年第2期11卷 269-287页

作者： Qiufeng he zezhou WU Xiangsheng CheN State Key Laboratory of Intelligent Geotechnics and Tunnelling Shenzhen 518060China Key Laboratory for Resilient Infrastructures of Coastal Cities(Shenzhen University) Ministry of EducationShenzhen 518060China Sino-Australia Joint Research Centre in BIM and Smart Construction Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Metro StationShenzhen 518060China

With the burgeoning emphasis on sustainable construction practices in China,the demand for green building assessment has significantly *** overall evaluation process comprises two key components:The acquisition of evaluation data and the evaluation of green scores,both of which entail considerable time and *** research predominantly concentrated on automating the latter process,often neglecting the exploration of automating the former in accordance with the Chinese green building assessment ***,there is a pressing requirement for more streamlined management of structured standard knowledge to facilitate broader *** response to these challenges,this paper presents a conceptual framework that integrates building information modeling,ontology,and web map services to augment the efficiency of the overall evaluation process and the management of standard *** specifically,in accordance with the Assessment Standard for Green Building(GB/T 50378-2019)in China,this study innovatively employs visual programming software,Dynamo in Autodesk Revit,and the application programming interface of web map services to expedite the acquisition of essential architectural data and geographic information for green building ***,ontology technology is harnessed to visualize the management of standard knowledge related to green building assessment and to enable the derivation of green scores through logical ***,a residential building is employed as a case study to validate the theoretical and technical feasibility of the developed automated evaluation conceptual framework for green *** research findings hold valuable utility in providing a self-assessment method for applicants in the field.

关键词： automatic evaluation green building BIM web map service ontology inference application

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

The intrinsic developmental age signal defines an age-dependent climbing behavior in cucumber

引用

Horticultural Plant Journal 2024年第3期10卷 797-808页

作者： zezhou Hong Xinrui Wang Zipei Fan Jiahao Wang Aiyi Yang Guochao Yan Yong he Huasen Wang Zhujun Zhu Yunmin Xu College of Horticulture Science Zhejiang Agriculture and Forestry UniversityHangzhouZhejiang 311300China Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable Ministry of Agriculture and Rural AffairsHangzhouZhejiang 311300China Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province HangzhouZhejiang 311300China

The tendril is a climbing organ in cucurbits and functions in physical support and to avoid shading by neighboring ***,how cucurbits produce tendrils to obtain climbing ability is largely *** this study,tendril phenotypes were investigated during different developmental *** results revealed that tendril growth exhibited an age-dependent pattern in *** growth was inhibited,and the tendril was formed as a short tendril[nonfunctional tendril(nonF-tendril),approximately 0.1 cm]during the seedling *** contrast,enhanced cell proliferation and cell expansion led to rapid elongation of the tendril during the climbing stage,and the tendril formed as a functional tendril(F-tendril,approximately 30 cm)to obtain climbing ***-qPCR detection showed that age-dependent tendril growth correlated negatively with the abundance of the conserved age regulator *** induced CsmiR156 to inhibit CsSPLs,and F-tendril formation and climbing ability were delayed in defoliated cucumbers,which confirmed the role of CsmiR156 in regulating tendril growth in ***,exogenous gibberellin(GA)treatment showed that GA positively regulated tendril growth,and RT-qPCR detection showed that the GA bio-synthetic genes and metabolic genes were affected by age pathway,suggesting that the age pathway depended on GA bio-synthetic and metabolic pathway to regulate cell expansion to determine tendril *** summary,our work reveals that change in tendril type is an important marker of phase transition in cucumber,and tendril growth is regulated by an intrinsic developmental age signal,ensuring that the cucumber obtains climbing ability at a suitable age.

关键词： Cucumber Tendril Age CsmiR156 CsSPL Climbing ability

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

钛合金二层板结构超塑成形/扩散连接试验研究

引用

稀有金属 2017年第12期41卷 1305-1310页

作者：杨钦鑫童国权何泽洲南京航空航天大学机电学院江苏南京210016

采用超塑成形/扩散连接(SPF/DB)工艺对TC4钛合金二层板结构进行制备。对TC4钛合金试样进行超塑拉伸试验研究,确定了温度900℃和应变速率9.8×10^(-4)s^(-1)为最佳超塑成形的工艺参数,并计算得出本构方程中的应变速率敏感指数m=0.57,K=99... 详细信息

采用超塑成形/扩散连接(SPF/DB)工艺对TC4钛合金二层板结构进行制备。对TC4钛合金试样进行超塑拉伸试验研究,确定了温度900℃和应变速率9.8×10^(-4)s^(-1)为最佳超塑成形的工艺参数,并计算得出本构方程中的应变速率敏感指数m=0.57,K=998.5。利用***软件对试验件的成形过程进行有限元模拟分析,获得了优化的压力-时间加载曲线。模拟结果显示板料在拐点圆角处最薄,且最大减薄率为42.5%,最大成形气压为2.0 MPa;在T=900℃和6)ε=9.8×10^(-4)s^(-1)下,加载优化的压力-时间曲线,成功进行了TC4二层板结构SPF/DB成形试验。最后对试验件进行了表面质量检查和扩散连接位置显微组织观察分析,结果显示:钛合金二层板的试验件的整体成形效果良好,试验件表面没有出现凹坑缺陷的现象,加强筋超塑成形完全;扩散连接情况良好,界面无明显缺陷,连接处实现了可靠的冶金连接。证明了所述工艺方案成形二层板结构件的可行性。

关键词： TC4钛合金双层板结构超塑成形/扩散连接有限元分析

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

纳米纤维素序构材料界面力学行为和设计的研究进展

引用

中国科学技术大学学报 2021年第10期51卷 766-786页

作者：宋戎妆侯远震何泽洲夏骏朱银波吴恒安中国科学技术大学近代力学系中国科学院材料力学行为和设计重点实验室

纳米纤维素是具有优异力学性能的可再生天然生物质材料,基于纳米纤维素的序构材料有望成为新一代高性能结构和功能材料并引领可持续发展.合理构建界面力学行为和材料微结构之间的非线性耦合关系是纳米纤维素序构材料强韧化设计研究的关... 详细信息

纳米纤维素是具有优异力学性能的可再生天然生物质材料,基于纳米纤维素的序构材料有望成为新一代高性能结构和功能材料并引领可持续发展.合理构建界面力学行为和材料微结构之间的非线性耦合关系是纳米纤维素序构材料强韧化设计研究的关键.本文综述了目前纳米纤维素序构材料界面力学行为和设计的研究进展.重点讨论了纳米纤维素的界面氢键行为、多尺度界面力学以及一些典型的界面和序构设计案例,总结并展望了下一步研究工作的重点方向,旨在从微纳米力学和多尺度力学的视角为设计和制备高性能纳米纤维素序构材料提供新思路.

关键词：纳米纤维素多尺度力学氢键界面序构材料设计

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

国产5083铝合金复杂零件超塑性成形工艺研究

引用

热加工工艺 2018年第17期47卷 112-116页

作者：何泽洲鲁世红王亦金孙东轩张子尧南京航空航天大学机电工程学院江苏南京210016 今创集团有限公司江苏常州213100

针对国产工业铝合金超塑成形件性能不佳以及成形效率低的问题,本文以地铁用门立柱罩零件作为研究对象,对5083工业铝合金零件超塑成形工艺进行了研究。首先对国产5083工业铝合金进行了热拉伸试验,得到了不同温度和应变速率下材料的伸长... 详细信息

针对国产工业铝合金超塑成形件性能不佳以及成形效率低的问题,本文以地铁用门立柱罩零件作为研究对象,对5083工业铝合金零件超塑成形工艺进行了研究。首先对国产5083工业铝合金进行了热拉伸试验,得到了不同温度和应变速率下材料的伸长率。然后利用MARC有限元软件对不同应变速率下的门立柱罩超塑成形过程进行有限元模拟,得到了应变速率对成形件减薄率以及成形效率的影响。最后结合模拟结果,在成形温度535℃和应变速率1.31×10-3s-1下利用有限元软件输出的压力-时间曲线成功地超塑性成形出门立柱罩零件,成形件的复杂难成形区域完全填充,过渡平滑,完全达到立柱罩零件质量要求,提高了成形效率。

关键词：铝合金复杂零件超塑成形有限元分析成形效率

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

隧道及地下工程低碳可持续发展现状与思考

引用

现代隧道技术 2024年第2期61卷 5-17页

作者：陈湘生何秋凤吴泽洲付艳斌陈坤阳极端环境岩土和隧道工程智能建养全国重点实验室深圳518060 海城市韧性基础设施教育部重点实验室(深圳大学) 深圳518060 深圳大学中澳BIM与智慧建造联合研究中心深圳518060 深圳大学土木与交通工程学院深圳518060

隧道及地下工程是我国工程建设行业的重要部分,厘清我国隧道及地下工程的可持续发展现状和面临的关键挑战,对抓住行业高质量发展的破解点、赋能行业绿色升级具有重要意义。对此,文章首先回顾了隧道及地下工程可持续发展的相关政策和发... 详细信息

隧道及地下工程是我国工程建设行业的重要部分,厘清我国隧道及地下工程的可持续发展现状和面临的关键挑战,对抓住行业高质量发展的破解点、赋能行业绿色升级具有重要意义。对此,文章首先回顾了隧道及地下工程可持续发展的相关政策和发展历程,探索行业可持续发展的关键转折点。其次,基于全寿命周期视角,阐述了我国隧道及地下工程在统筹规划、绿色材料应用、绿色施工工法、智能低碳运维、工程废料资源化利用六个方面的可持续发展现状。最后,提出我国隧道及地下工程可持续发展面临的挑战,并给出相应的建议:(1)借助数字化技术,突破规划信息不全面壁垒;(2)持续研究新材料,增强结构抗扰性和防水性;(3)结合数字孪生技术,提升施工工序智能化水平;(4)基于工程物联网,加强工程监测智能化感知;(5)改良工艺和设备,提高建废利用率和附加值。研究以期为我国工程建设行业实现产业增值和绿色发展的良性循环提供有用的见解。

关键词：隧道及地下工程可持续发展统筹规划绿色建材绿色施工智能运维资源化利用

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

Universal materials model of deep-learning density functional theory Hamiltonian

引用

Science Bulletin 2024年第16期69卷 2514-2521页

作者： Yuxiang Wang Yang Li Zechen Tang he Li Zilong Yuan Honggeng Tao Nianlong Zou Ting Bao Xinghao Liang zezhou Chen Shanghua Xu Ce Bian Zhiming Xu Chong Wang Chen Si Wenhui Duan Yong Xu State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Institute for Advanced Study Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China RIKEN Center for Emergent Matter Science(CEMS) Wako 351-0198Japan School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Realizing large materials models has emerged as a critical endeavor for materials research in the new era of artificial intelligence,but how to achieve this fantastic and challenging objective remains ***,we propose a feasible pathway to address this paramount pursuit by developing universal materials models of deep-learning density functional theory Hamiltonian(Deep H),enabling computational modeling of the complicated structure-property relationship of materials in *** constructing a large materials database and substantially improving the Deep H method,we obtain a universal materials model of Deep H capable of handling diverse elemental compositions and material structures,achieving remarkable accuracy in predicting material *** further showcase a promising application of fine-tuning universal materials models for enhancing specific materials *** work not only demonstrates the concept of Deep H's universal materials model but also lays the groundwork for developing large materials models,opening up significant opportunities for advancing artificial intelligencedriven materials discovery.

关键词： Large materials model Universal materials model Deep-learning density functional theory Artificial intelligence-driven materials discovery

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

An overview of the mission and technical characteristics of Change'4 Lunar Probe

引用

Science China(Technological Sciences) 2017年第5期60卷 658-667页

作者： YE PeiJian SUN zezhou ZHANG he LI Fei China Academy of Space Technology Beijing 100094 China Institute of Spacecraft System Engineering Beijing 100094 China

Change＇4 Lunar Probe will softly land on the farside of the Moon for the first time of all mankind and carry out in-situ and rovering exploration. In this paper, the scientific significance and engineering difficulties of Change＇4 are introduced and the probe＇s general design, including the aspects of landing site selection, relay communication, trajectory design of relay satellite is explained. Besides, four key technologies, namely safe landing strategy on complex terrain, orbit design and control of libration point 2, relay communication on L2, radioisotope thermoelectric generator （RTG） and electric-thermal utilization, as well as how to realize them are also discussed. Finally the prospect of the prominent technological breakthrough of Change＇4 is described.

关键词： Change'4 farside relay communication libration point South-Pole Aitken Basin RTG

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：