检索结果-南通市图书馆

SST effect on the pre-monsoon intraseasonal oscillation over the South China Sea based on atmospheric-coupled GCM comparison

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

Journal of Oceanology and Limnology 2023年第2期41卷 409-417页

作者： Yun Liang Yan DU Shang-Ping XIE State Key Laboratory of Tropical Oceanography&Key Laboratory of Science and Technology on Operational Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences&Innovation Academy of South China Sea Ecology and Environmental EngineeringGuangzhou 510301China College of Marine Science University of Chinese Academy of SciencesBeijing 100049China Peking University Chongqing Research Institute of Big Data Chongqing 401332China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 510301China Scripps Institution of Oceanography University of CaliforniaSan DiegoLa JollaCA 92093USA

The role of sea surface temperature(SST)variability in the pre-monsoonal(April to July)intraseasonal oscillation(ISO)over the South China Sea(SCS)is investigated using the Community Earth System Model Version 2(CESM2).An Atmospheric Model Intercomparison Project(AMIP)simulation forced by daily sea surface temperatures(SSTs)derived from a parallel coupled general circulation model(CGCM)run was compared with observations and the mother coupled simulation.In the coupled model,the SST warming leads the peak convection about 1/4 period as in observations.The paralell uncoupled model fails to simulate this phase relationship,implying the importance of air-sea coupling in reproducing realistic ISO.Due to the near-quadrature phase relationship between SST and precipitation ISOs during the ISO events,it is difficult to distinguish the active/passive role of SST from observations alone.Significant correlation in intraseasonal precipitation between the daily SST-forced AMIP and mother CGCM runs indicates that SST plays a role in driving the atmospheric ISO.

关键词： intraseasonal variability South China Sea Community Earth System Model Version 2(CESM2) sea surface temperature

止裂孔对蒙皮裂纹应力集中的影响及在修理中的应用

在线全文

学校读者我要写书评

暂无评论

河南科技 2021年第16期40卷 36-38页

作者：梁赟空军工程大学航空机务士官学校河南信阳464000

为研究飞机蒙皮上止裂孔对裂纹应力集中的影响情况,建立蒙皮上裂纹和止裂孔的有限元分析模型,研究裂纹损伤的应力集中系数与止裂孔相对直径的关系。结果表明,随着止裂孔相对直径的增加,止裂孔对蒙皮应力集中的改善效果越来越好,当相对... 详细信息

为研究飞机蒙皮上止裂孔对裂纹应力集中的影响情况,建立蒙皮上裂纹和止裂孔的有限元分析模型,研究裂纹损伤的应力集中系数与止裂孔相对直径的关系。结果表明,随着止裂孔相对直径的增加,止裂孔对蒙皮应力集中的改善效果越来越好,当相对直径大于0.05时,改善效果就不太明显了。最后介绍了止裂孔在蒙皮裂纹修理中的应用方法。

关键词：蒙皮裂纹止裂孔应力集中

Feature-preserving color pencil drawings from photographs

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2023年第4期9卷 807-825页

作者： Dong Wang Guiqing Li Chengying Gao Shengwu Fu Yun Liang College of Mathematics and Informatics South China Agricultural UniversityGuangzhouChina School of Computer Science&Engineering South China University of TechnologyGuangzhouChina School of Data and Computer Science Sun Yat-sen UniversityGuangzhouChina

Color pencil drawing is well-loved due to its rich expressiveness.This paper proposes an approach for generating feature-preserving color pencil drawings from photographs.To mimic the tonal style of color pencil drawings,which are much lighter and have relatively lower saturation than photographs,we devise a lightness enhancement mapping and a saturation reduction mapping.The lightness mapping is a monotonically decreasing derivative function,which not only increases lightness but also preserves input photograph features.Color saturation is usually related to lightness,so we suppress the saturation dependent on lightness to yield a harmonious tone.Finally,two extremum operators are provided to generate a foreground-aware outline map in which the colors of the generated contours and the foreground object are consistent.Comprehensive experiments show that color pencil drawings generated by our method surpass existing methods in tone capture and feature preservation.

关键词： non-photorealistic rendering pencil drawings image editing feature preservation

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

从二里头文化的人群构成看夏文化概念

中原文化研究 2023年第4期11卷 21-30页

作者：梁云李盼盼西北大学文化遗产学院陕西西安710127

根据墓向葬俗可将含墓葬遗存的二里头文化遗址分为甲、乙、丙三类,甲类以北向墓为主,乙类以南向墓为主,丙类北向、南向墓比例大体相当,三类遗址在空间分布上有一定规律。经分析可知该文化的北向墓和南向墓分别代表了不同人群,该文化的... 详细信息

根据墓向葬俗可将含墓葬遗存的二里头文化遗址分为甲、乙、丙三类,甲类以北向墓为主,乙类以南向墓为主,丙类北向、南向墓比例大体相当,三类遗址在空间分布上有一定规律。经分析可知该文化的北向墓和南向墓分别代表了不同人群,该文化的人群构成是以北向墓人群为主,南向墓人群为辅。参考夏、商、周三代皆流行北首葬的文献记载,以及夏遗民墓葬的考古发现,可知二里头文化的北向墓人群为姒姓夏族。文献又记载了彭姓的韦和己姓的顾、昆吾等夏之与国,考古发现周代彭姓、己姓贵族墓为南向墓,可推知二里头文化的南向墓人群为彭姓、己姓部族;这些部族擅长制陶、铸铜、绿松石工艺。夏王朝的兴起开始于姒姓夏人与部分“祝融”后裔的联盟。“夏文化”概念有广义和狭义两个层次,分别是在考古学文化和族属两个层面的定义。

关键词：二里头文化北向墓南向墓人群构成夏文化

Bioinspired Nanostructured Superwetting Thin-Films in a Self-supported form Enabled“Miniature Umbrella”for Weather Monitoring and Water Rescue

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第2期14卷 174-189页

作者： Shan Li Peng Xiao Wei Zhou Yun Liang Shiao-Wei Kuo Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China School of Chemical Sciences University of Chinese Academy of Sciences19A Yuquan RoadBeijing 100049People’s Republic of China Department of Material and Optoelectronic Science National Sun Yat-Sen UniversityKaohsiung 804TaiwanPeople’s Republic of China

Two-dimensional(2D)soft materials,especially in their self-supported forms,demonstrate attractive properties to realize biomimetic morphing and ultrasensitive sensing.Although extensive efforts on design of self-supported functional membranes and integrated systems have been devoted,there still remains an unexplored regime of the combination of mechanical,electrical and surface wetting properties for specific functions.Here,we report a self-supported film featured with elastic,thin,conductive and superhydrophobic characteristics.Through a well-defined surface modification strategy,the surface wettability and mechanical sensing can be effectively balanced.The resulted film can function as a smart umbrella to achieve real-time simulated raining with diverse frequencies and intensity.In addition,the integrated umbrella can even response sensitively to the sunlight and demonstrate a positively correlation of current signals with the intensity of sun illumination.Moreover,the superhydrophobic umbrella can be further employed to realize water rescue,which can take the underwater object onto water surface,load and rapidly transport the considerable weight.More importantly,the whole process of loaded objects and water flow velocity can be precisely detected.The self-supported smart umbrella can effectively monitor the weather and realize a smart water rescue,demonstrating significant potentials in multifunctional sensing and directional actuation in the presence of water.

关键词： Self-supported Superhydrophobic thin films Multifunctional sensing Water rescue

LADA strategy for the synthesis of unnatural amino acids and direct modifications of peptides

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第6期66卷 1788-1794页

作者： Jun-liang Zhou yun-Qi Liu Zhan-Kui Sun Shanghai Frontiers Science Center for Drug Target Identification and Drug Delivery School of Pharmaceutical SciencesShanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Pharm-X CenterSchool of Pharmaceutical SciencesShanghai Jiao Tong UniversityShanghai 200240China AI Pharma Center Zhangjiang Institute for Advanced StudyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Artificial Intelligence Laboratory Shanghai 200232China

Unnatural amino acids(UAAs)are important building blocks in organic synthesis and drug discovery.They are also frequently integrated into peptides or proteins for biological studies.However,the direct and simplified synthesis of UAAs remains a great challenge.At the same time,vast known peptide modifications are based on carbon-heteroatom bonds.There are no general methods for peptide modifications via the construction of C–C bonds.To address this challenge,herein we propose the LADA strategy,which is composed of two steps:the selective labeling and activation of cysteine residues,the desulfurization to generate carbon-centered radical and the radical addition to alkenes to build C–C bond.This one-pot protocol has obvious advantages such as good functional group tolerance,biocompatible reaction conditions,and retained stereochemistry.This strategy was successfully utilized for the synthesis of unnatural amino acids and direct modifications of peptides.

关键词： unnatural amino acids peptide modifications desulfurization cysteine radical addition

Mechanical Performance of Bio-inspired Bidirectional Corrugated Sandwich Pressure Shell Under External Hydrostatic Pressure

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第2期38卷 297-312页

作者： ZHANG Yi CHEN Yue yun Lai liang Xu Ocean College Zhejiang UniversityZhoushan 316000China Hainan Institute Zhejiang UniversitySanya 572000China

This paper aims to enhance the compression capacity of underwater cylindrical shells by adopting the corrugated sandwich structure of cuttlebone.The cuttlebone suffers uniaxial external compression,while underwater cylindrical shells are in a biaxial compressive stress state.To suit the biaxial compressive stress state,a novel bidirectional corrugated sandwich structure is proposed to improve the bearing capacity of cylindrical shells.The static and buckling analysis for the sandwich shell and the unstiffened cylindrical shell with the same volume-weight ratio are studied by numerical simulation.It is indicated that the proposed sandwich shell can effectively reduce the ratio between circumferential and axial stress from 2 to 1.25 and improve the critical buckling load by about 1.63 times.Numerical simulation shows that optimizing and adjusting the structural parameters could significantly improve the advantage of the sandwich shell.Then,the hydrostatic pressure tests for shell models fabricated by 3D printing are carried out.According to the experimental results,the overall failure position of the sandwich shell is at the center part of the sandwich shell.It has been found the average critical load of the proposed sandwich shell models exceeds two times that of the unstiffened shell models.Hence,the proposed bio-inspired bidirectional corrugated sandwich structure can significantly enhance the pressure resistance capability of cylindrical shells.

关键词： bio-inspiration bidirectional corrugation sandwich shell external pressure buckling

在线全文

学校读者我要写书评

暂无评论

Preface

Journal of Computer Science & Technology 2021年第5期36卷 961-962页

作者： Chao Li Yun Liang Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai Tenured Associate Professor School of Electronics Engineering and Computer Science Peking UniversityBeijing

It is our great pleasure to welcome you to the 14th Advanced Parallel Processing Technology(APPT 2021),the flagship conference of the China Computer Federation Technical Committee on Computer Architecture(CCF TCARCH)!

关键词： Computer welcome Preface

Search for gamma-ray line signals around the black hole at the galactic center with DAMPE observation

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

Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 150-158页

作者： Tian-Ci Liu Ji-Gui Cheng yun-Feng liang En-Wei liang Laboratory for Relativistic Astrophysics Department of PhysicsGuangxi UniversityNanning 530004China

The adiabatic growth of a black hole(BH)may enhance the dark matter(DM)density surrounding it,causing a spike in the DM density profile.The spike around the supermassive BH at the center of the Milky Way may lead to a dramatic enhancement of the gamma-ray flux of DM annihilation from the galactic center(GC).In this work,we analyze the gamma-ray data of the innermost region(i.e.,the inner 1°)of the GC to search for potential line-like signals from the BH spike.Such line-like signals could be generated in the process of DM particles annihilating into double photons.We adopt the gamma-ray data from the Dark Matter Particle Explorer(DAMPE).Although the DAMPE has a much smaller effective area than the Fermi-LAT,the gamma-ray line search can benefit from its unprecedented high energy resolution.No significant line-like signals are found in our analysis.We derive upper limits on the cross section of the annihilation based on this non-detection.We find that despite the DAMPE’s small effective area for photon detection,we can still place strong constraints on the cross section(≥10^(-27)cm^(3)s^(-1))in the spike scenario due to the very bright model-expected flux from the spike.Our results indicate that either DM does not annihilate primarily through theγγchannel in the mass range we considered or no sharp density spike is present at the GC.

关键词： dark matter γ-ray telescopes black holes galactic center