检索结果-南通市图书馆

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

试论元嘉文学与宋文帝正统地位的建构

文学遗产 2024年第2期 99-112页

作者：郭晨光北京师范大学国际中文教育学院

景平二年(424)是刘宋朝的政治转折点。傅亮、徐羡之等废杀少帝刘义符后,拥立刘裕第三子刘义隆为帝,是为宋文帝。自此以后,文帝及刘宋政权一直面临着合法性的质疑:在政权内部,入继大统的理由不充分,导致其资望不足,涉及政权正当性和政治... 详细信息

景平二年(424)是刘宋朝的政治转折点。傅亮、徐羡之等废杀少帝刘义符后,拥立刘裕第三子刘义隆为帝,是为宋文帝。自此以后,文帝及刘宋政权一直面临着合法性的质疑:在政权内部,入继大统的理由不充分,导致其资望不足,涉及政权正当性和政治信任的危机函待解决;在政权外部,不仅与北魏存在军事上的竞争,而且由此产生了双方的正朔之争。文帝将文学作为争夺正统地位的重要手段:一方面,通过符瑞的造作、书写来制造“天命”,论证其承继刘裕大位、“受命于天”的合法性;另一方面,通过边塞诗实现王权“大一统”的理念。在此过程中,文帝注重重塑君臣关系,借此打造一种新的文学秩序,重建和维系个人及其政权的权威。

关键词：宋文帝正统符瑞边塞诗

基于NXMCD的虚实映射实验交互系统设计与实践

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

实验技术与管理 2024年第3期41卷 123-130页

作者：郭辰光范建成岳海涛李强戴卫兵孙瑜辽宁工程技术大学机械工程学院辽宁阜新123000

该文基于数字孪生理念,结合NX MCD机电概念设计、PLC编程与控制和LabVIEW的图形化编程手段,完成了基于NX MCD的虚实映射实验交互系统设计与实践。以LabVIEW设计的UI界面为控制监测端,物理对象与MCD虚拟模型为执行端,实现了物理对象与MC... 详细信息

该文基于数字孪生理念,结合NX MCD机电概念设计、PLC编程与控制和LabVIEW的图形化编程手段,完成了基于NX MCD的虚实映射实验交互系统设计与实践。以LabVIEW设计的UI界面为控制监测端,物理对象与MCD虚拟模型为执行端,实现了物理对象与MCD虚拟模型的虚实映射,同时MCD虚拟模型能够输出控制信号进而控制物理对象。在此基础上,设计了步进电机往复运动与MCD虚拟模型虚实映射实验案例。该实验案例可为本科生和研究生相关课程的实践教学提供虚实映射交互实验方法和手段,可显著提升学生的创新实践能力与水平,是对数字化实践教学研究的一次探索。

关键词：虚实映射数字孪生实验交互系统 MCD虚拟模型

Resolving the sintering conundrum of high-rhenium tungsten alloys

同方期刊数据库

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

Journal of Materials Science & Technology 2023年第35期166卷 78-85页

作者： Zhongyou Que Xingyu Li Lin Zhang Xuanhui Qu Zichen Wei chenguang guo Haishen Sun Mingli Qin Gang Chen Peinan Du Yanhao Dong Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Tungsten-rhenium(W-Re)alloys with high-Re contents are the preferred refractory metal materials in many applications because of the improved ductility and processability over pure W and low-Re tung-sten ***,the sintering concurrently becomes increasingly more difficult with increasing Re *** we proposed that the sintering conundrum is caused by the lowered crystal symmetry and the wider dihedral angle distribution when body-center-cubic(BCC)W is alloyed with more hexagonal-close-packed(HCP)Re,which results in inefficient pore removal in the final stage *** showed that the conundrum can be resolved by pressureless two-step sintering(TSS)which suppresses acceler-ating final-stage grain growth,and our proposal is supported by the data of the critical densityρc that is required to start the second step for successful TSS at different W-Re *** ultrafine-grained W-Re alloys with∼300 nm average grain size and up to 25 wt%Re were successfully *** work demonstrates the unique opportunities offered by two-step sintering to advance the scientific understanding and technological practices in powder metallurgy and related fields.

关键词： W-Re alloys Two-step sintering Grain growth Ultrafine-grained materials

Phase-controlled van der Waals growth of wafer-scale 2D MoTe_(2) layers for integrated high-sensitivity broadband infrared photodetection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第1期12卷 77-88页

作者： Di Wu chenguang guo Longhui Zeng Xiaoyan Ren Zhifeng Shi Long Wen Qin Chen Meng Zhang Xin Jian Li Chong-Xin Shan Jiansheng Jie School of Physics and Microelectronics Key Laboratory of Material Physics Ministry of EducationZhengzhou UniversityZhengzhouHenan 450052China Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92093USA Institute of Nanophotonics Jinan UniversityGuangzhouGuangdong 511443China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhouJiangsu 215123China

Being capable of sensing broadband infrared(IR)light is vitally important for wide-ranging applications from fundamental science to industrial ***-dimensional(2D)topological semimetals are being extensively explored for broadband IR detection due to their gapless electronic structure and the linear energy dispersion ***,the low charge separation efficiency,high noise level,and on-chip integration difficulty of these semimetals significantly hinder their further technological ***,we demonstrate a facile thermal-assisted tellurization route for the van der Waals(vdW)growth of wafer-scale phase-controlled 2D MoTe_(2)***,the type-ⅡWeyl semimetal 1T'-MoTe_(2)features a unique orthorhombic lattice structure with a broken inversion symmetry,which ensures efficient carrier transportation and thus reduces the carrier *** characteristic is a key merit for the well-designed 1T'-MoTe_(2)/Si vertical Schottky junction photodetector to achieve excellent performance with an ultrabroadband detection range of up to 10.6μm and a large room temperature specific detectivity of over 108 Jones in the mid-infrared(MIR)***,the large-area synthesis of 2D MoTe_(2)layers enables the demonstration of high-resolution uncooled MIR imaging capability by using an integrated device *** work provides a new approach to assembling uncooled IR photodetectors based on 2D materials.

关键词： hinder enable difficulty

A scalable versatile methodology to construct micro/nano open-cell polypropylene foam with high oil adsorption capacity and speed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2814-2823页

作者： chenguang Yang Dechang Tao Kun Yan Zhiyao Li Qingshi guo Wenwen Wang Dong Wang Key Laboratory of Textile Fiber and Products(Wuhan Textile University) Ministry of EducationWuhan Textile UniversityWuhan 430200China College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China

Oil pollution is a serious environmental and natural resource *** adsorption materials for oil–water separation have limitations in terms of their preparation cost,reusability,and mechanical *** the conventional adsorption materials,super-hydrophobic/super-lipophilic materials are easily contaminated by *** this study,polypropylene(PP)is used as a foam substrate to prepare an open-cell PP foam via hot pressing,supercritical CO_(2) foaming,and electron beam(EB)*** impact of EB irradiation dose on the open-cell content of PP foam can lead to cell wall rupture,resulting in an open-cell structure that enhances oil-water separation *** an absorbed radiation dose of 200 kGy,the PP foams exhibit optimal oil–water separation performance,cyclic compression stability,heat insulation,and preparation *** open-cell content of PP foam is increased to 86.5%,the adsorption capacity for diesel oil is 42.8 g/g,and the adsorption efficiency remains at 99.6%after 100 cycles of oil desorption in a complex pH ***,cracks and nano-voids simultaneously promote the capillary action of oil,and the oil transport rate is 0.0713 g/(g·s).This study provides a new concept for the preparation of open-cell polymer foams that can meet the demand for high oil-absorption capacity under complex acid-base pH conditions.

关键词： open-cell polypropylene(PP)foam electron beam irradiation oil/water separation cyclic compression complex acid-base pH conditions

Increasing impacts of fire air pollution on public and ecosystem health

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 Innovation 2024年第3期5卷 11-12页

作者： Xu Yue Yihan Hu chenguang Tian Rongbin Xu Wenhua Yu Yuming guo Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing 210044China School of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVIC 3004Australia

Wildfire episodes have become more frequent and severe in recent years.1 Record-breaking fires devastated the Arctic,Amazon,and Australia in 2019–*** year,fires began in Canada in May and lasted for several months,resulting in an area burned of 16.5 million hectares by early *** size is 6–7 times the annual fire area for a normal year in *** favorable fire weather for burning and spread lasted for months(https://***/maps/fw).Furthermore,most Canadian fires occur in remote regions far from firefighting facilities,causing fire extinction to be ***,such“unprecedented”fire events occurred routinely in boreal regions between 2020 and 2023,although the locations varied from year to year(Figure 1).

关键词： Canada pollution Figure

Milling Parameters Optimization of Al-Li Alloy Thin-Wall Workpieces Using Response Surface Methodology and Particle Swarm Optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2020年第9期124卷 937-952页

作者： Haitao Yue chenguang guo Qiang Li Lijuan Zhao Guangbo Hao School of Mechanical Engineering Liaoning Technical UniversityFuxin12300China School of Engineering University College CorkCorkT12 K8AFIreland

To improve the milling surface quality of the Al-Li alloy thin-wall workpieces and reduce the cutting energy *** research on the milling processing of AA2195 Al-Li alloy thin-wall workpieces based on Response Surface Methodology was carried *** single factor and interaction of milling parameters on surface roughness and specific cutting energy were analyzed,and the multi-objective optimization model was *** Multiobjective Particle Swarm Optimization algorithm introducing the Chaos Local Search algorithm and the adaptive inertial weight was applied to determine the optimal combination of milling *** was observed that surface roughness was mainly influenced by feed per tooth,and specific cutting energy was negatively correlated with feed per tooth,radial cutting depth and axial cutting depth,while cutting speed has a non-significant influence on specific cutting *** optimal combination of milling parameters with different priorities was *** experimental results showed that the maximum relative error of measured and predicted values was 8.05%,and the model had high reliability,which ensured the low surface roughness and cutting energy *** was of great guiding significance for the success of Al-Li alloy thin-wall milling with a high precision and energy efficiency.

关键词： Al-Li alloy thin-wall workpieces response surface methodology surface roughness specific cutting energy multi-objective particle swarm optimization algorithm

Protective performance of shear stiffening gel-modified foam against ballistic impact:Experimental and numerical study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第2期32卷 510-520页

作者： Huan Tu Haowei Yang Pengzhao Xu Zhe Yang Fan Tang Cheng Dong Yuchao Chen Lei Ren Wenjian Cao chenguang Huang Yacong guo Yanpeng Wei Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Xi'an Institute of Electromechanical Information Technology Xi'an 710065China Science and Technology on Transient Impact Laboratory Beijing 102202China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

As one of the most widely used personal protective equipment(PPE),body armors play an important role in protecting the human body from the high-velocity impact of bullets or *** body torso and critical organs of the wear may suffer severe behind-armor blunt trauma(BABT)even though the impactor is stopped by the body armor.A type of novel composite material through incorporating shear stiffening gel(STG)into ethylene-vinyl acetate(EVA)foam is developed and used as buffer layers to reduce *** this paper,the protective performance of body armors composed of fabric bulletproof layers and a buffer layer made of foam material is investigated both experimentally and *** effectiveness of STG-modified EVA in damage relief is verified by ballistic *** parallel with the experimental study,numerical simulations are conducted by LS-DYNA®to investigate the dynamic response of each component and capture the key mechanical parameters,which are hardly obtained from field *** fully describe the material behavior under the transient impact,the selected constitutive models take the failure and strain rate effect into consideration.A good agreement between the experimental observations and numerical results is achieved to prove the validity of the modelling *** tests and simulations show that the impact-induced deformation on the human body is significantly reduced by using STG-modified EVA as the buffering *** improvement of protective performance is attributed to better dynamic properties and more outstanding energy absorption capability of the composite foam.

关键词： Ballistic behavior Composite foam Shear stiffening gel Finite element analysis Protective mechanism

Impact of Southern Indian ocean dipole via the ITCZ on winter and spring precipitation in China

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

Atmospheric and Oceanic Science Letters 2023年第6期16卷 28-33页

作者： Ran Dong Yuanhong Guan Wen Zhou chenguang guo School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjingChina Center for Applied Mathematics of Jiangsu Province Nanjing University of Information Science and TechnologyNanjing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing China Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghaiChina

本文分析了1979-2021年南印度洋冬季海表面温度特征,印度洋热带辐合带(ITCZ)位置变化及其对中国冬春季降水的影响.EOF分析第一模态表明南印度洋冬季海表面温度异常显示西南-东北反相分布,即南印度洋偶极子模态(SIOD).分离厄尔尼诺-南方... 详细信息

本文分析了1979-2021年南印度洋冬季海表面温度特征,印度洋热带辐合带(ITCZ)位置变化及其对中国冬春季降水的影响.EOF分析第一模态表明南印度洋冬季海表面温度异常显示西南-东北反相分布,即南印度洋偶极子模态(SIOD).分离厄尔尼诺-南方涛动(ENSO)信号后,纯SIOD事件对同年冬季和次年春季的印度洋ITCZ位置(35°-75°E平均)均有影响,冬季,纯正(负)SIOD事件使印度洋ITCZ往南(北)移动.春季,SIOD则使印度洋ITCZ移动方向与冬季相反,且移动幅度更大.冬,春季长江中下游地区(MLYR)的降水量与印度洋ITCZ位置分别呈正,负相关.同时,在纯正(负)SIOD事件下,冬,春季MLYR的降水分别减少,增加,可见印度洋ITCZ位置变化可能是SIOD影响MLYR冬,春季降水的媒介之一.

关键词：南印度洋偶极子 ENSO ITCZ 降水