检索结果-南通市图书馆

Cooperative localization methods of autonomous underwater vehicle swarm integrated with inverted ultrashort baseline

引用

Chinese Journal of Acoustics 2024年第1期43卷 1-22页

作者： LIU Feng WANG Yuxiong CHEN Huifang xie lei College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027 Zhejiang Provincial Laboratory of Information Processing Communication and NetworkingHangzhou 310027 Zhoushan Ocean Research Center Zhejiang UniversityZhoushan 316021

A cooperative localization factor graph for the autonomous underwater vehicle(AUV) swarm integrated with inverted ultrashort baseline(iUSBL) is constructed. Two cooperative localization methods of slave AUV in an AUV swarm are proposed, namely the extended Kalman filter(EKF)-based cooperative localization method and particle belief propagation(BP)-based cooperative localization method, where the effect of the positioning error of leader AUV is mitigated. For the EKF-based cooperative localization method, the state of the slave AUV is reconstructed with the positioning information of leader AUV to achieve cooperative localization. In the particle-BP-based cooperative localization method,the measurement particles are generated to realize cooperative localization. The proposed methods can solve the poor real-time problem of traditional methods, and only require oneway acoustic positioning transmission measurement to realize the localization of the slave AUV. Simulation results show that the two proposed cooperative localization methods work well for slave AUVs with different localization abilities. Compared with the dead-reckoning method, the localization errors of two proposed methods are reduced by more than 80%,and the positioning error accumulation is effectively suppressed. Furthermore, the proposed cooperative localization methods can operate normally under a high packet loss rate of the underwater acoustic channel, and the localization performance is not significantly degraded.

关键词： underwater autonomous cooperative

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

Thylakoid engineered M2 macrophage for sonodynamic effect promoted cell therapy of early atherosclerosis

引用

Nano Research 2024年第4期17卷 2919-2928页

作者： Guanghao Wu Changwen Mu Qianru Zhao Yao lei Ran Cheng Weidong Nie Jiamin Qu Yuping Dong Ruili Yang Haiyan xie State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesChemical Biology CenterPeking UniversityBeijing 100191China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Life Science Beijing Institute of TechnologyBeijing 100081China School of Stomatology Peking UniversityBeijing 100081China

Atherosclerosis is the most common cause of cardiovascular diseases that contribute to the major morbidity worldwide,but still lacking of effective treatment ***,a hybrid cell is constructed for the sonodynamic effect promoted cell therapy of early atherosclerosis by fusing M2 macrophages with thylakoid(TK)*** systemic administration,the obtained TK-M2 actively accumulates in the early atherosclerotic plaques,wherein M2 macrophages relieve the cholesterol accumulation and the inflammation in the foam ***,the TK membranes decorated on the M2 macrophages exhibit both type I and type II sonodynamic effects under ultrasound(US)activation,inducing the direct apoptosis of foam *** cooperation of M2 and TK leads to significant outcome in eliminating atherosclerotic plaques without obvious side-effects,providing a new avenue for atherosclerosis treatment.

关键词： atherosclerosis thylakoid ultrasound M2 macrophage

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

Automatic Generation Control in a Distributed Power Grid Based on Multi-step Reinforcement Learning

引用

Protection and Control of Modern Power Systems 2024年第4期9卷 39-50页

作者： Wenmeng Zhao Tuo Zeng Zhihong Liu Lihui xie lei Xi Hui Ma the Electric Power Research Institute Southern Power GridGuangzhou 510663China the Heyuan Power Supply Bureau Guang-dong Power Grid Co.Ltd.Heyuan 517000China the College of Electrical Engineering&New Energy China Three Gorges UniversityYichang 443002China the College of Electrical Engineering&New Energy and Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station China Three Gorges UniversityYichang 443002China IEEE

The increasing use of renewable energy in the power system results in strong stochastic disturbances and degrades the control performance of the distributed power *** this paper,a novel multi-agent collaborative reinforcement learning algorithm is proposed with automatic optimization,namely,Dyna-DQL,to quickly achieve an optimal coordination solution for the multi-area distributed power *** proposed Dyna framework is combined with double Q-learning to collect and store the environmental *** can iteratively update the agents through buffer replay and real-time *** the environmental data can be fully used to enhance the learning speed of the *** mitigates the negative impact of heavy stochastic disturbances caused by the integration of renewable energy on the control *** are conducted on two different models to validate the effectiveness of the proposed *** results demonstrate that the proposed Dyna-DQL algorithm exhibits superior stability and robustness compared to other reinforcement learning algorithms.

关键词： Automatic generation control Dyna framework distributed power grid multi-agent mod-el-based reinforcement learning

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

Revealing the Structure-Property Difference of Natural Rubber Prepared by Different Methods: Protein and Gel Content are Key Factors

引用

Chinese Journal of Polymer Science 2024年第4期42卷 457-467页

作者： shao-Qi Huang Jun-Qi Zhang Yong Zhu Ling-Min Kong Lu-Sheng Liao Fu-Quan Zhang Zheng-Tian xie Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China Hainan Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang524001China

Natural rubber (NR) is widely used in various fields including aerospace, military industry and transportation due to its superior elasticity and comprehensive mechanical properties. Nonetheless, the commercial NR prepared by different methods usually exhibits different mechanical properties, primarily due to variations in processing conditions during the conversion from latex to bulk rubber material. Consequently, this poses challenges in scientific research and industrial production of NR. In order to assess the properties of various commercially available NR and identify key structural and compositional components, this study systematically compares and analyzes four representative NR raw materials: air dried sheet (ADS), ribbed smoked sheets (RSS), constant viscidity NR (CV), and whole field latex rubber (WF). The investigation focuses on evaluating their static mechanical behavior, SIC behavior, wear resistance, and fatigue resistance. The findings indicate that protein and gel content exhibit a crucial influence on the NR properties. These constituents contribute to the formation of a high-crosslinking density region, generating a heterogeneous network structure within the rubber. This structure amplifies strains during deformation, leading to earlier and stronger strain-induced crystallization (SIC). Among the four commercial NR brands, RSS demonstrates superior overall mechanical and dynamic properties owing to its high protein and gel content. This study serves as a valuable reference for comprehending the differences in properties among various commercial NR, thereby offering guidance for the actual processing and selection of NR.

关键词： Natural rubber Processingmethod Protein Gel content Property

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

Intelligent diagnosis of retinal vein occlusion based on color fundus photographs

引用

International Journal of Ophthalmology(English edition) 2024年第1期17卷 1-6页

作者： Yu-Ke Ji Rong-Rong Hua Sha Liu Cui-Juan xie shao-Chong Zhang Wei-Hua Yang Eye Hospital Nanjing Medical UniversityNanjing 210000Jiangsu ProvinceChina College of Electronic Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210000Jiangsu ProvinceChina Shenzhen Eye Institute Shenzhen Eye HospitalJinan UniversityShenzhen 518000Guangdong ProvinceChina

AIM:To develop an artificial intelligence(AI)diagnosis model based on deep learning(DL)algorithm to diagnose different types of retinal vein occlusion(RVO)by recognizing color fundus photographs(CFPs).METHODS:Totally 914 CFPs of healthy people and patients with RVO were collected as experimental data sets,and used to train,verify and test the diagnostic model of *** the images were divided into four categories[normal,central retinal vein occlusion(CRVO),branch retinal vein occlusion(BRVO),and macular retinal vein occlusion(MRVO)]by three fundus disease *** Transformer was used to build the RVO diagnosis model,and different types of RVO diagnosis experiments were *** model’s performance was compared to that of the ***:The accuracy of the model in the diagnosis of normal,CRVO,BRVO,and MRVO reached 1.000,0.978,0.957,and 0.978;the specificity reached 1.000,0.986,0.982,and 0.976;the sensitivity reached 1.000,0.955,0.917,and 1.000;the F1-Sore reached 1.000,0.9550.943,and 0.887 *** addition,the area under curve of normal,CRVO,BRVO,and MRVO diagnosed by the diagnostic model were 1.000,0.900,0.959 and 0.970,*** diagnostic results were highly consistent with those of fundus disease experts,and the diagnostic performance was ***:The diagnostic model developed in this study can well diagnose different types of RVO,effectively relieve the work pressure of clinicians,and provide help for the follow-up clinical diagnosis and treatment of RVO patients.

关键词： deep learning artificial intelligence Swin Transformer diagnostic model retinal vein occlusion color fundus photographs

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

3D nano-printed geometric phase metasurfaces for generating accelerating beams with complex amplitude manipulation

引用

Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 86-95页

作者： Tianchen Tang Saima Kanwal Yongzheng Lu Yuelong Li Shuangbao Wu lei Chen Ziheng Qian Zhouyu xie Jing Wen Dawei Zhang Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Metasurface,a forefront in emerging optical devices,has demonstrated remarkable potential for complex amplitude manipulation of light ***,prevailing approaches face challenges in spatial resolution and complexities associated with integrating dynamic phases,impeding the simplified design and reproducible fabrication of ***,we introduce an innovative approach for complex amplitude modulation within 3D nano-printed geometric phase *** approach enables the generation of self-accelerating beams by encoding amplitude through phase-only manipulation,achieving high spatial ***,this method circumvents the conventional need to adjust the geometric parameters of metasurface unit structures for amplitude manipulation,offering a streamlined and efficient route for design and fabrication *** novel methodology holds promise for expedited and low-cost manufacturing of complex amplitude manipulation metasurfaces.

关键词： metasurface complex amplitude manipulation geometric phase 3D nano-printing Airy beam accelerating parabolic beam

来源：

维普期刊数据库

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

“In-N-out” design enabling high-content triethyl phosphate-based non-flammable and high-conductivity electrolytes for lithium-ion batteries

引用

Science China Chemistry 2024年第2期67卷 724-731页

作者： Mengchuang Liu Fenfen Ma Zicheng Ge Ziqi Zeng Qiang Wu Hui Yan Yuanke Wu Sheng lei Yanli Zhu Shijie Cheng Jia xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan430074China GuSu Laboratory of Materials Suzhou215123China Institute of Metal Research Chinese Academy of SciencesShenyang110000China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Safety issues related to flammable electrolytes in lithium-ion batteries(LIBs) remain a major challenge for their extended *** use of non-flammable phosphate-based electrolytes has proved the validity in inhibiting the combustion of ***,the strong interaction between Li^(+) and phosphate leads to a dominant solid electrolyte interphase(SEI) with limited electronic shielding,resulting in the poor Li^(+) intercalation at the graphite(Gr) anode when using high-phosphate-content *** mitigate this issue and improve Li^(+) insertion,we propose an “In-N-Out” strategy to render phosphates “noncoordinative”.By employing a combination of strongly polar solvents for a “block effect” and weakly polar solvents for a “drag effect”,we reduce the Li^(+)–phosphate *** a result,phosphates remain in the electrolyte phase(“In”),minimizing their impact on the incompatibility with the Gr electrode(“Out”).We have developed a non-flammable electrolyte with high triethyl phosphate(TEP) content(>60 wt.%),demonstrating the excellent ion conductivity(5.94 mS cm^(-1) at 30 ℃) and reversible Li^(+) intercalation at a standard concentration(~1 mol L^(-1)).This approach enables the manipulation of multiple electrolyte functions and holds the promise for the development of safe electrochemical energy storage systems using non-flammable electrolytes.

关键词： lithium-ion batteries graphite anode high-phosphate-content electrolytes non-flammable electrolyte excellent ion conductivity standard concentration

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

Enhancing zinc-air battery performance by constructing threedimensional N-doped carbon coating multiple valence Co and MnO heterostructures

引用

Nano Research 2024年第6期17卷 5104-5113页

作者： Qi Liu Panzhe Qiao Miaomiao Tong Ying xie Xinxin Zhang Kuo Lin Zhijian Liang lei Wang Honggang Fu Key Laboratory of Superlight Materials and Surface Technology of the Ministry of Education of the People’s Republic of China Harbin Engineering UniversityHarbin 150080China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China Heilongjiang UniversityHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China

Developing highly-efficient bifunctional oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)electrocatalysts is crucial for the widespread application of rechargeable Zn-air batteries(ZABs).Herein,an efficiency electrodeposition and pyrolytic strategy to synthesize the three-dimensional(3D)N-doped carbon coating multiple valence Co and MnO heterostructures supported on carbon cloth substrate(Co-MnO@NC/CC).It contains Co-Co,Co-N,and Co-O bonds,which synergistically enhance the oxygen reaction activity with *** exhibits a working potential of 1.473 V at 10 mA·cm^(−2)for OER and onset potential of 0.97 V for *** calculations demonstrate that the synergy between cobalt and manganese species could optimize the d-band center and reduce the energy barrier of Co-MnO@NC/CC for both OER and ORR ***,the MnO acts as the main OER active site could significantly optimize the energy barrier of O*→OOH*,thus further promoting the OER *** can be directly used as the air-cathode for both liquid-state and solid-state ZABs,which could afford a small voltage gap of 0.75 V at 10 mA·cm^(−2),a high power density of 172.5 mW·cm^(−2)and a long-term durability for 400 h,surpassing those of the Pt/C+RuO_(2)-based ***,the assembled batteries show potential applications in portable devices.

关键词： heterostructure synergy valence cobalt manganese oxide Zn-air battery

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

Thiol-Disulfide Exchange Coordinates the Release of Nitric Oxide and Dexamethasone for Synergistic Regulation of Intestinal Microenvironment in Colitis

引用

Research 2024年第2期6卷 285-300页

作者： Junna Lu Tongfei Shi Chengxin Shi Fangman Chen Chao Yang Xiaochun xie Zheng Wang He Shen Jiaqi Xu Kam W.Leong Dan shao School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhouGuangdong 510006China National Engineering Research Center for Tissue Restoration and Reconstruction South China University of TechnologyGuangdong 510006China Department of Plastic and Aesthetic Center The First Affliated Hospital of Zhejiang UniversityHangzhou 310000China Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA School of Medicine South China University of TechnologyGuangzhouGuangdong 510006China CAS Key Laboratory of Nano-Bio Interface Suzhou Institute of Nano-Tech and NanoBionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory for Biomedical Efects of Nanomaterials&Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Guangdong Provincial Key Laboratory of Biomedical Engineering South China University of TechnologyGuangzhou 510006China Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education South China University of TechnologyGuangzhou 510006China

The cell-specific functions of nitric oxide(NO)in the intestinal microenvironment orchestrate its therapeutic effects in ulcerative *** most biomaterials show promise by eliciting the characteristics of NO,the insufficient storage,burst release,and pro-inflammatory side effects of NO remain as ***,we report the development of thiol-disulfide hybrid mesoporous organosilica nanoparticles(MONs)that improve the storage and sustained release of NO,broadening the therapeutic window of NO-based therapy against *** tailored NO-storing nanomaterials coordinated the release of NO and the immunoregulator dexamethasone(Dex)in the intestinal microenvironment,specifically integrating the alleviation of oxidative stress in enterocytes and the reversal of NO-exacerbated macrophage ***,such a synchronous operation was achieved by a self-motivated process wherein the thiyl radicals produced by NO release cleaved the disulfide bonds to degrade the matrix and release Dex via thiol-disulfide ***,the MON-mediated combination of NO and Dex greatly ameliorated intractable colitis compared with 5-aminosalicylic acid,even after delayed ***,our results reveal a key contribution of synergistic modulation of the intestinal microenvironment in NO-based colitis therapy and introduce thiol-disulfide hybrid nanotherapeutics for the management of inflammatory diseases and cancer.

关键词： sustained release disulfide

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

Slope-climbing of cropland and its effects in China

引用

Journal of Mountain Science 2024年第8期21卷 2754-2769页

作者： CHEN Wanxu xie Youping YUAN Jintao ZENG Jie YANG Liyan GU Tianci lei Fan Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Key Laboratory of Natural Resources Monitoring and Supervision in Southern Hilly Region Ministry of Natural ResourcesChangsha 410118China Yunnan Key Laboratory of Plateau Geographic Processes and Environmental Changes Faculty of GeographyYunnan Normal UniversityKunming 650500China

In recent decades,the spatio-temporal patterns of China’s croplands have been reshaped by disturbances from anthropogenic activities,with complex changes in the topographic characteristics of ***-climbing of croplands(SCCL)is an important issue that threatens sustainable agricultural *** providing land with prominent location advantages,SCCL weakens the water and fertilizer retention capacity for cropland,intensifies various geological disasters,and adversely affects the ecological environment and food yield of these *** is crucial to determine the spatio-temporal variation features and effects of SCCL in China to formulate more accurate cropland protection policies and to maintain food security;however,the current lack of relevant studies is detrimental for capturing trends in cropland resources and sustainable cropland *** this study,we constructed a multi-scale slope spectrum for cropland and total terrain to explore the spatial differences and trends of SCCL from a three-dimensional *** evaluated the natural and socioeconomic effects of SCCL in China from multiple *** indicate that the proportion of cropland with slopes below 2°,5°,and 6°in China decreased by 0.43%,0.47%,and 0.50%from 1980 to 2020,*** became apparent during 1980-1990 and 2010-2020,especially over the recent *** cropland climbing index(CCI)and upper limited slope change(ULSC)to measure the spatio-temporal pattern of SCCL were 0.99%and 1.17°,respectively,during *** the agricultural regional scale,the SCCL was also concentrated in 1980-1990 and 2010-2020,and it is more pronounced in the southern *** proportion of provinces and prefecture-level cities with high-intensity SCCL during 1980-2020 were 87.10%and 49.73%,*** was comparatively more pronounced and broader from 2010 to *** this period,17.84%of prefecture-level cities had no SCCL,and the average CCI for all prefecture-level citi

关键词： Croplands Slope spectrum Slope-climbing Three-dimensional perspective Multi-scale China

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：