检索结果-南通市图书馆

A comparison study on structure-function relationship of polysaccharides obtained from sea buckthorn berries using different methods:antioxidant and bile acid-binding capacity

引用

Food Science and Human Wellness 2024年第1期13卷 494-505页

作者： Qiaoyun Li Zuman Dou Qingfei duan Chun chen Ruihai Liu Yueming Jiang bao Yang Xiong Fu SCUT-Zhuhai Institute of Modern Industrial Innovation School of Food Science and EngineeringSouth China University of Technology381 Wushan RoadGuangzhou 510640China Guangzhou Institute of Modern Industrial Technology Nansha 511458China Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety Guangzhou 510640China Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health(111 Center) Guangzhou 510640China Department of Food Science Stocking HallCornell UniversityIthaca 14853USA South China Botanical Garden Chinese Academy of SciencesGuangzhou 510650China

In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic(HRP-U),acid(HRP-C)and alkali(HRP-A)assisted extraction methods were *** results demonstrated that extraction methods had significant effects on extraction yield,monosaccharide composition,molecular weight,particle size,triple-helical structure,and surface morphology of HRPs except for the major linkage *** analysis showed that HRP-U with filamentous reticular microstructure exhibited better thermal *** HRP-A with the lowest molecular weight and highest arabinose content possessed the best antioxidant ***,the rheological analysis indicated that HRPs with higher galacturonic acid content and molecular weight showed higher viscosity and stronger crosslinking network(HRP-C,HRP-W and HRP-U),which exhibited stronger bile acid binding *** present findings provide scientific evidence in the preparation technology of sea buckthorn polysaccharides with good antioxidant and bile acid binding capacity which are related to the structure affected by the extraction methods.

关键词： Sea buckthorn Extraction method Structure Rheological properties Antioxidant activity Bile acid binding capacity

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

Experimental and numerical study of hypervelocity impact damage on composite overwrapped pressure vessels

引用

Defence Technology（防务技术） 2024年第1期31卷 58-72页

作者： Yong-Pan duan Run-Qiang Chi bao-Jun Pang Yuan Cai Hypervelocity Impact Research Center Harbin Institute of TechnologyHarbin150080China College of Science Heilongjiang University of Science and TechnologyHarbin 150022China

Ground-based tests are important for studying hypervelocity impact(HVI)damage to spacecraft pressure vessels in the orbital debris *** analyzed the damage to composite overwrapped pressure vessels(COPVs)in the HVI tests and classified the damage into non-catastrophic damage and catastrophic *** proposed a numerical simulation method to further study non-catastrophic damage and revealed the characteristics and mechanisms of non-catastrophic damage affected by impact conditions and internal *** fragments of the catastrophically damaged COPVs were collected after the *** crack distribution and propagation process of the catastrophic ruptures of the COPVs were *** findings contribute to understanding the damage characteristics and mechanisms of COPVs by HVIs.

关键词： Orbital debris Hypervelocity impact Composite overwrapped pressure vessels Damage mechanisms

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

Loss of Light Yield of Doped Lead Tungstate Crystals After Irradiation

引用

Chinese Physics Letters 1999年第10期16卷 745-746页

作者： HE Jing-tang LU Yu-sheng chen duan-bao LI Zu-hao BIAN Jian-guo ZHU Guo-yi TANG Xiao-wei chen Gang ZHENG Lian-rong chen Xiao-hong REN Shao-xia Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 Beijing Inorganic Crystal Laboratory Beijing Glass Research InstituteBeijing 100062

Loss of light yield of doped lead tungstate crystals after irradiation with a low dose rate has been *** La,Pr,and Y doping may improve radiation hardness,whereas Bi or Mo doping is harmful.

关键词： doping state Crystal

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

High-order Autler–Townes splitting in electrically tunable photonic molecules

引用

Photonics Research 2024年第8期12卷 1794-1801页

作者： YIHAO chen JUNTAO duan JIN LI YAN chen JIEWEN LI JIANAN duan XIAOCHUAN XU JIAWEI WANG School of Integrated Circuit Harbin Institute of Technology(Shenzhen)Shenzhen 518055China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China National Key Laboratory of Laser Spatial Information Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Whispering gallery mode optical microresonators represent a promising avenue for realizing optical analogs of coherent light–atom interactions,circumventing experimental ***-optical analogs of Autler–Townes splitting have been widely demonstrated,harnessing coupled optical microresonators,also known as photonic molecules,wherein the strong coupling between resonant fields enables energy level ***,we report the characterizations of Autler–Townes splitting in waveguide-coupled microring dimers featuring mismatched *** exploiting backscattering-induced coupling via Rayleigh and Mie scatterers in individual rings,high-order Autler–Townes splitting has been realized,yielding supermode hybridization in a multi-level *** resonance detuning using an integrated phase shifter,intra-cavity coupling-induced splitting becomes almost indistinguishable at the zero-detuning point where the strong inter-cavity coupling counteracts the imbalance of backscattering strengths in individual *** demonstrations on the maturing silicon photonics platform,our findings establish a framework of electrically tunable photonic molecules for coupling-mediated Autler–Townes splitting,offering promising prospects for on-chip signal generation and processing across classical and quantum regimes.

关键词： tunable tuning waveguide

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

Unidirectional propagation of water waves near ancient Luoyang Bridge

引用

Frontiers of physics 2024年第3期19卷 167-174页

作者： Linkang Han Qilin duan Junliang duan Shan Zhu Shiming chen Yuhang Yin Huanyang chen Shenzhen Research Institute of Xiamen University Shenzhen 518000China Department of Physics Xiamen UniversityXiamen 361005China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education Xiamen UniversityXiamen 361005China

Metasurfaces and metagratings offer new platforms for electromagnetic wave control with significant ***,metasurfaces based on abrupt phase change and resonant structures suffer from the drawback of high loss and face challenges when applied in water ***,the application of metasurfaces in water wave control is not ideal due to the limitations associated with high loss and other *** have discovered that non-resonant metagratings exhibit promising effects in water wave *** the similarity between bridges and metagratings,we have successfully developed a water wave metagrating model inspired by the ancient Luoyang Bridge in *** conduct theoretical calculations and simulations on the metagrating and derive the equivalent anisotropic model of the *** model provides evidence that the metagrating has the capability to control water waves and achieve unidirectional surface water *** accuracy of our theory is strongly supported by the clear observation of the unidirectional propagation phenomenon during simulation and experiments conducted using a reduced version of the *** is the first time that the unidirectional propagation of water waves has been seen in water wave metagrating *** all,we realize the water wave metagrating experiment for the first *** combining complex gratings with real bridges,we explore the physics embedded in the ancient building—Luoyang Bridge,which are of great significance for the water wave metagrating design and provide a new method for analyzing the effects of water waves on *** the same time,this discovery also provides a new idea for ocean cargo transportation,ocean garbage cleaning,and the development and protection of ancient bridges.

关键词： Luoyang Bridge unidirectional propagation water wave metagratings equivalent anisotropic model

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

Gamma-Rays Generated from Plasmas in the Interaction of Solid Targets with Femtosecond Laser Pulses

引用

Chinese Physics Letters 1998年第11期15卷 816-818页

作者： HE Jing-tang ZHANG Ping chen duan-bao LI Zu-hao ZHANG Ying WANG Long FENG bao-hua ZHANG Xiu-lan WEI Zhi-yi LI Zan-liang TANG Xiao-wei ZHANG Jie Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 Laboratory of Optical Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080 Department of Physics University of OxfordOX13PUUK

The γ-rays with energies up to 300keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 × 10^(15) ***^(-2).μm^(2) irradiating Ta,Mo,and Cu *** introducing an 8% prepulse of 70ps before the main pulse,the fraction of high energy γ-ray photons(hv>l00keV)was significantly enhanced relative to low energy photons(hv<100 keV).

关键词： Femto femtosecond Solid

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

Effects of Polarization on Super-hot Electron Generation in Femtosecond Laser-Plasma Interaction

引用

Chinese Physics Letters 2001年第10期18卷 1374-1376页

作者： ZHANG Ping LIANG Tian-Jiao chen Li-Ming LI Yu-Tong chen duan-bao LI Zu-Hao HE Jing-Tang WEI Zhi-yi WANG Long TANG Xiao-wei ZHANG Jie Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 Laboratory of Optical Physics:Institute of Physics Chinese Academy of SciencesBeijing 100080 Institute of Physics Chinese Academy of SciencesBeijing 100080

The effects of laser polarization on super-hot electron (> 100 keV) generation have been studied in the interaction of femtosecond laser light (800 nm, 150 fs, 6 × 10^(15) W·cm^(-2)) with a pre-formed plasma from a slab Cu target. For p-polarized laser pulses, high-energy γ-rays of the energy ~400keV were detected. The electron temperatures deduced from the γ-ray spectra were 66 and 52keV, respectively, in normal and reflective directions of the solid target, and hot electrons were emitted out of the plasma mainly in the normal direction. In contrast, there were nearly no γ-rays >100keV found for s-polarized laser pulses. The hot electron temperature was 26keV and the emission of hot electrons was parallel to the laser field. The superposition of resonant field with electrostatic field excited by escaping electrons may contribute to the high-energy γ-ray or super-hot electron (> 100 keV) generation.

关键词： field. polarized Polarization

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

UAV swarm air combat maneuver decision-making method based on multi-agent reinforcement learning and transferring

引用

Science China(Information Sciences) 2024年第8期67卷 49-66页

作者： Zhiqiang ZHENG chen WEI Haibin duan State Key Laboratory of Virtual Reality Technology and Systems School of Automation Science and Electrical Engineering Beihang University

During short-range air combat involving unmanned aircraft vehicle(UAV) swarms, UAVs must make accurate maneuver decisions based on information from both enemy and friendly UAVs. This dual requirement of competition and cooperation presents a significant challenge in the field of unmanned air combat. In this paper, a method based on multi-agent reinforcement learning(MARL) is proposed to address this issue. An actor network containing three subnetworks that can handle different types of situational information is designed. Hence, the results from simpler one-on-one scenarios are leveraged to enhance the complex swarm air combat training process. Separate state spaces for local and global information are designed for the actor and critic networks. A detailed reward function is proposed to encourage *** prevent lazy participants in air combat, a reward assignment operation is applied to distribute these dense rewards. Simulation testing and ablation experiments demonstrate that both the transfer operation and reward assignment operation can effectively deal with the swarm air combat scenario, and reflect the effectiveness of the proposed method.

关键词： UAV swarm short-range air combat multi-agent reinforcement learning reward assignment transfer

来源：

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

Design, modeling, and evaluation of parallel continuum robots: A survey

引用

Science China(Technological Sciences) 2024年第3期67卷 673-695页

作者： chen GenLiang TANG ShuJie duan XuYang WANG Hao Meta Robotics Institute Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Digital Manufacturing for Thin-Walled Structures Shanghai Jiao Tong UniversityShanghai 200240China

Parallel continuum robots(PCRs) have attracted increasing attention in the robotics community due to their simplicity in structure,inherence with compliance, and easiness of realization. Over the past decade, a variety of novel designs have been reported to enrich their diversity. However, there is a lack of systematic review of these emerging robots. To this end, this paper conducts a comprehensive survey on the mechanism design, kinetostatic modeling and analysis, and performance evaluation. For these robots, kinetostatic modeling plays a fundamental role throughout the design, analysis, and control stages. A systematic review of the existing approaches for kinetostatic modeling and analysis is provided, and a comparison is made to distinguish their differences. As well, a classification is made according to the characteristics of structure and actuation. In addition, performance evaluation on the workspace, stability, and singularity is also overviewed. Finally, the scenarios of potential applications are elaborated, and future research prospects are discussed. We believe that the information provided in this paper will be particularly useful for those who are interested in PCRs.

关键词： parallel continuum robots classification kinetostatic modeling performance evaluation

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

Interfacial tribochemical kinetics: A new perspective on superlubricity of diamond-like carbon films

引用

Science China(Technological Sciences) 2024年第7期67卷 2050-2052页

作者： chen WeiQi MA Tian-bao State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Friction is considered one of the primary challenges affecting the performance of machine operations and is a significant source of energy loss in industrial applications. About 30%of disposable energy is consumed by ... 详细信息

关键词： kinetics friction operations

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：