检索结果-南通市图书馆

Study on the Promotion of Wound Healing in Mice with Burn Injuries by Bioactive Glass 1393

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Biomedical Engineering(English Edition) 2024年第1期33卷 9-16,26页

作者： XIA wei-dong XU ke ZHENG Chao-yu CHEN Xue-nan National Clinical key Specialty(Wound Repair Department) Wenzhou Medical University Affiliated First HospitalWenzhou Zhejiang 325000China Institute of Life Sciences Wenzhou UniversityWenzhou Zhejiang 325000China Wuhan University of Science and Technology School of Medicine Wuhan Hubei 430000China

Objective:To investigate the effect and mechanism of bioactive glass1393 on wound healing in mice with burn ***:A benchtop temperature-controlled scald instrument was used to establish a mouse burn wound model,which was divided into an injury group(simple scald group)and a bioactive glass 1393treatment *** wound healing of burn injuries in mice was observed at different times after the operation,and the formation of granulation tissue,collagen deposition and tissue proliferation in the wounds were observed by HE staining,Masson staining and Ki67 staining,and the levels of apoptosis-related proteins and the expression of wnt3a/β-catenin signaling pathway were detected in the wounds by Western ***:Compared with the injury group,the bioactive glass 1393 group accelerated burn wound healing and promoted granulation tissue formation,collagen deposition,and cell *** addition,compared with the injury group,the bioactive glass 1393 group promoted the expression of Bcl-2 protein,inhibited the expression of Bax protein and up-regulated the expression of Wnt3a andβ-catenin ***:Bioactive glass 1393 promotes burn wound healing in mice by inhibiting apoptosis through modulation of wnt3a/β-catenin signaling pathway.

关键词： bioactive glass 1393 wound healing apoptosis

A hybrid attention model based on first-order statistical features for smoke recognition

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第3期67卷 809-822页

作者： GUO nan LIU JiaHui DI keXin GU ke QIAO JunFei Beijing Laboratory of Smart Environmental Protection Beijing Key Laboratory of Computational Intelligence and Intelligent SystemBeijing Artificial Intelligence InstituteBeijing 100124China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China

Smoke and fire recognition are of great importance on foreseeing fire disasters and preventing environmental pollution by monitoring the burning process of objects(e.g., straw, fuels). However, since fire images suffer from problems like the variability of the features, complexity of scenarios, interference from background, changeable weather conditions as well as image quality problems, identifying smoke and fire accurately and promptly from a given image still remains a substantial challenge. Automatically learning the features of smoke images by CNNs has improved the target recognition ability compared to traditional approaches,nonetheless, convolutions and pooling operations in CNNs may cause severe information loss which may lead to *** tackle the above problems, this paper proposed a hybrid attention model based on the characteristics of smoke images. This model adopted multiple optimized attention mechanism in several stages to quickly and precisely capture the important features,achieving state-of-the-art performance on smoke and fire recognition in terms of accuracy and speed. Our proposed module mainly consists of two stages: pooling and attention. In the first stage, we conducted several newly proposed first-order pooling methods. Through traversing the data space in a larger scope, features are better reserved, thus constructing a more intact feature space of smoke and fire in an image. In the second stage, feature maps are aggregated together to perform channel and spatial attention. The channel and spatial dependencies allow us to quickly catch the important features presented in an image. By fully exploring the feature space and prominent salient features, characteristics of smoke and fire are better presented so as to obtain better smoke and fire detection results. Experiments have been conducted on public smoke detection dataset and new proposed fine-grained smoke and fire detection database. Experimental results revealed that the propose

关键词： hybrid attention first-order pooling smoke and fire detection deep convolutional neural networks

在线全文

学校读者我要写书评

暂无评论

2-甲基呋喃羟烷基化/烷基化反应研究进展

精细与专用化学品 2024年第5期32卷 20-23页

作者：李艳清安玲千驰闫嘉敏孙萌泽张泽启韦科楠程嘉伟陈嘉涛李春燕王伟陕西理工大学化学与环境科学学院陕西汉中723000

2-甲基呋喃作为一种重要的有机化工原料,可以转化为增值化学品和液体燃料等,用途广泛。综述了近年来2-甲基呋喃与一系列羰基化合物的羟烷基化/烷基化反应的研究进展。

关键词：生物质 2-甲基呋喃羟烷基化/烷基化反应

Pyrolysis Empirical Modeling of Polyester Glass Fiber Reinforced Plastics Using Sestak-Berggren Model Method

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第2期33卷 725-738页

作者： nan wei JI Wenhui YUAN Yanping YUAN Zhongyuan SUN Yong School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China CRRC Changchun Railway Vehicles Co. LtdChangchun130062China

Polyester Glass Fiber Reinforced Plastic(Polyester GFRP),a thermosetting plastic comprised of glass fiber and polyester polymer compounds,is extensively utilized in high-speed *** its pyrolysis mechanism is crucial as it significantly influences the combustion characteristics and fire safety ***,kinetic research on polyester GFRP primarily focuses on employing the Coats-Redfern method to derive a theoretical kinetic ***,the pyrolysis process of polyester GFRP is complex and the aforementioned theoretical model fails to accurately describe the pyrolysis ***,this study seeks to utilize the Sestak and Berggren(SB) model as a methodological approach to reveal the complex reaction mechanism during the pyrolysis *** on thermogravimetric analysis,the entire pyrolysis process of polyester GFRP is divided into two primary ***,model-free methods are employed to ascertain the activation energy and pre-exponential *** results show that the fitted empirical models of the two main pyrolysis stages are f(α)=(1-α)^(1.47)[-ln(1-α)]^(1.50) and f(α)=(1-α)^(1.77)[-ln(1-α)]^(1.72),*** predicted results are in good agreement with experimental data under different heating rates,which indicates that the empirical model can sufficiently describe the pyrolysis process of polyester GFRP.

关键词： polyester GFRP model-fitting methods empirical models pyrolysis

Kinetics and mechanism of propylene hydro-oxidation to acrolein on Au catalysts

在线全文

学校读者我要写书评

暂无评论

nano Research 2024年第1期17卷 354-363页

作者： wei Du Zhihua Zhang nan Song Xuezhi Duan Xinggui Zhou State key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Propylene epoxidation by H_(2)and O_(2)to propylene oxide(PO)over the Au-Ti bifunctional catalysts,as an ideal reaction for PO production,has attracted great *** the mechanism of acrolein formation is of great importance for understanding the mechanism of molecular oxygen activation and the formation of hydroperoxo species on the Au ***,we investigate the reaction mechanism of propylene oxidation to acrolein on the Au/uncalcined TS-1(Au/TS-1-B)catalyst through a combination of multiple characterization,H_(2)/D_(2)exchange,kinetics experiment,and *** Ti sites are found to be non-essential to acrolein ***,the acrolein formation on the Au/TS-1-B catalyst is confirmed to be promoted by H_(2)through hydroperoxo species formation,which includes two main steps:propylene dehydrogenation to*C_(3)H_(5)with the aid of*OOH species,and*C_(3)H_(5)oxidation by*OOH to *** latter step is determined to be the rate-determining step because the corresponding kinetics model gives the best description for experimental *** work not only provides kinetics insights for the propylene hydro-oxidation to acrolein on the Au-Ti bifunctional catalysts,but also facilitates the rational design of Au catalysts with high activity and selectivity in the direct propylene epoxidation with H_(2)and O_(2).

关键词： kinetics mechanism gold acrolein hydro-oxidation

Research on the Stability Analysis Method of DC Microgrid Based on Bifurcation and Strobe Theory

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

Energy Engineering 2024年第4期121卷 987-1005页

作者： wei Chen nan Qiu Xusheng Yang School of Electrical Engineering and Information Engineering Lanzhou University of TechnologyLanzhou730050China

During the operation of a DC microgrid,the nonlinearity and low damping characteristics of the DC bus make it prone to oscillatory *** this paper,we first establish a discrete nonlinear system dynamic model of a DC microgrid,study the effects of the converter sag coefficient,input voltage,and load resistance on the microgrid stability,and reveal the oscillation mechanism of a DC microgrid caused by a single ***,a DC microgrid stability analysis method based on the combination of bifurcation and strobe is used to analyze how the aforementioned parameters influence the oscillation characteristics of the ***,the stability region of the system is obtained by the Jacobi matrix eigenvalue *** simulation verifies the feasibility and effectiveness of the proposed method.

关键词： DC microgrid bifurcation nonlinear dynamics stability analysis oscillation characteristics

Photoinduced bismuth vanadate-catalyzed C(sp^(2))-H functionalization

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

Chinese Chemical Letters 2024年第3期35卷 1-2页

作者： Rong-nan Yi wei-Min He key Laboratory of Food&Environment&Drug Monitoring and Testing of Universities in Hunan Province Hunan Police AcademyChangsha 410138China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Visible light-induced organic reactions have gained much attention in recent years due to their mild conditions and high efficiency[1,2].In this context,many efficient photocatalysts including transition metal complex... 详细信息

关键词： bismuth catalyzed gained

Relationships Between Meteorological Factors and Mongolian Gerbils and Its Flea Burdens—Xilingol League,Inner Mongolia Autonomous Region,China,2012–2021

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2024年第23期6卷 547-552,I0012-I0018页

作者： ke Li Zhenxu Wang Xiaohui wei Haoqiang Ji Meng Shang nan Chang Zihao Wang Chenran Guo Lei Xu Ning Zhao Qiyong Liu National key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina School of Public Health Nanjing Medical UniversityNanjing CityJiangsu ProvinceChina Cheeloo College of Medicine Shandong UniversitySchool of Public HealthJinan CityShandong ProvinceChina Vanke School of Public Health Tsinghua UniversityBeijingChina

Introduction:Plague is a significant global infectious disease,its spread is linked to host and flea *** conditions can impact flea populations and host densities,hence influencing plague *** the connection between meteorological factors,flea populations,and rodent densities in Inner Mongolia’s natural plague foci can aid in predicting and managing plague ***:Monthly data on flea index,rodent density,meteorological factors,and normalized difference vegetation index(NDVI)were collected for the study *** additive modeling(GAM)was used to analyze the non-linear and lag effects of meteorological factors on flea index and rodent *** equation modeling(SEM)was employed to investigate the relationships among meteorological factors,NDVI,flea index,and rodent ***:GAM analysis revealed that temperature,precipitation,relative humidity,and NDVI had significant linear,non-linear,and time-lagged impacts on the density of Mongolian gerbils and the flea *** analysis indicated that meteorological factors could directly influence the density and flea index of Mongolian gerbils,or indirectly impact NDVI,subsequently influencing gerbil density and the flea ***:Meteorological factors primarily influence gerbil density and flea index indirectly by affecting NDVI and the relationship between flea index and gerbil *** study offers additional support for the significance of meteorological factors and NDVI in influencing the vector-rodent system,offering valuable insights for predicting and managing plague outbreaks.

关键词： meteorological offering humidity

First proof-of-principle experiment with the post-accelerated isotope separator on-line beam at BRIF:measurement of the angular distribution of ^(23)Na+^(40)Ca elastic scattering

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

Nuclear Science and Techniques 2021年第5期32卷 101-106页

作者： wei nan Bing Guo Cheng-Jian Lin Lei Yang Dong-Xi Wang Yang-Ping Shen Bing Tang Bao-Qun Cui Tao Ge Yin-Long Lyu Hui-Ming Jia Yun-Ju Li Chen Chen Li-Hua Chen Qi-Wen Fan Xin-Yue Li Gang Lian Jian-Cheng Liu Tian-Peng Luo nan-Ru Ma Rui-Gang Ma Xie Ma Ying-Jun Ma wei-ke nan Dan-Yang Pang You-Bao Wang Pei-wei Wen Feng Yang Yong-Jin Yao Sheng Zeng Hao Zhang Fu-Peng Zhong Shan-Hao Zhong Zhi-Hong Li Tian-Jue Zhang wei-Ping Liu BRIF Collaboration China Institute of Atomic Energy(CIAE) P.O.Box 275(10)Beijing 102413China Department of Physics Guangxi Normal UniversityGuilin 541004China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China School of Physics Beihang UniversityBeijing 100191China key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China

The reaction dynamics of exotic nuclei near the drip line is one of the main research topics of current *** scattering is a useful probe for investigating the size and surface diffuseness of exotic *** development of rare isotope accelerators offers opportunities for such *** date,many relevant measurements have been performed at accelerators using the projectile fragmentation technique,while the measurements at accelerators using isotope separator on-line(ISOL)systems are still quite *** this work,we present the first proof-of-principle experiment with a post-accelerated ISOL beam at the Beijing Radioactive Ion Beam Facility(BRIF)by measuring the angular distribution of elastic scattering for the stable nucleus^(23)Na from the doubly magic nucleus^(40)Ca at energies above the Coulomb *** angular distribution measured by a silicon strip detector array in a scattering chamber using the ISOL beam at BRIF is in good agreement with that measured by the high-precision Q3 D magnetic spectrograph using the nonISOL beam at nearly the same *** work provides useful background for making BRIF a powerful tool for the investigation of the reaction dynamics of exotic nuclei.

关键词： BRIF Exotic nuclei Elastic scattering Angular distribution