检索结果-南通市图书馆

生物材料促进角膜碱烧伤修复的作用机制和应用途径

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第10期29卷 2162-2170页

作者：肖辉李冬妍汲婧王丽珍北京航空航天大学生物与医学工程学院生物力学与力生物学教育部重点实验室北京市生物医学工程高精尖创新中心北京市100083

背景:在角膜碱烧伤治疗中,传统治疗方法存在多种局限,尤其在控制炎症、预防新生血管形成和抑制角膜瘢痕化方面表现不佳。天然材料、合成材料或复合材料为治疗提供了多元化的选择,然而生物材料促进角膜碱烧伤修复的相关机制尚未形成系统... 详细信息

背景:在角膜碱烧伤治疗中,传统治疗方法存在多种局限,尤其在控制炎症、预防新生血管形成和抑制角膜瘢痕化方面表现不佳。天然材料、合成材料或复合材料为治疗提供了多元化的选择,然而生物材料促进角膜碱烧伤修复的相关机制尚未形成系统深入的认识。目的:对目前生物材料促进角膜碱烧伤修复的国内外研究进行梳理,综述生物材料修复角膜碱烧伤的机制及其应用途径。方法:第一作者以“角膜,碱烧伤,羊膜,透明质酸,胶原,壳聚糖,高分子材料”“Amniotic membrane,Hyaluronic acid,Collagen,Chitosan,Polymer,Cornea,Alkali burn”为关键词在Pub Med、Web of Science、中国知网和万方文献数据库内检索,根据纳入标准和排除标准,最终纳入符合要求的76篇文献进行综述。结果与结论:(1)在角膜碱烧伤修复领域,羊膜、透明质酸、胶原、壳聚糖和可降解高分子材料等生物材料被广泛研究和应用,这些生物材料各有其特点和优缺点,在不同方面都有所突出。(2)首先,羊膜因含丰富的生物活性因子而被认为是最有前景的生物材料之一,其生物相容性良好,并且能够调节角膜炎症反应,但是存在供体短缺和易感染疾病的问题。(3)透明质酸具有良好的保湿性和生物相容性,并且能够提高角膜细胞的生存率和增加角膜透明度。(4)胶原具有良好的生物相容性和支架结构,能够促进角膜细胞的黏附和增殖,促进角膜组织结构的重建。(5)壳聚糖具有良好的生物相容性和可降解性,可作为载体用于药物递送和细胞移植。(6)可降解高分子材料具有较好的降解可控性,可为角膜碱烧伤的修复提供良好的支持和递送平台,但其稳定性和生物相容性仍需进一步研究。(7)综合来看,目前还没有一种生物材料能够完全解决角膜碱烧伤的修复问题,每种生物材料都有其特定的适用场景和局限性。(8)未来的研究方向应该是通过进一步改进生物材料的性能和结构,探索更有效的组合应用方式,以及深入了解生物材料与角膜组织的相互作用机制,以提高角膜碱烧伤的治疗效果和患者的生活质量。

关键词：角膜碱烧伤生物材料修复机制羊膜透明质酸壳聚糖高分子材料综述

Recent Advances of Imide-Functionalized Polymer Donors for Non-fullerene Solar Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第15期42卷 1759-1780页

作者： Huijuan Wang Songmin Mo dongyan li Qinghe Wu Department of Chemistry and Key(Guangdong-Hong Kong Joint)Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Shantou UniversityShantouGuangdong 515063China

In recent years,there has been a shift towards using non-fullerene electron acceptors in organic solar cells(osCs)as a replacement for fullerene *** change requires polymer donors that possess compatible physical properties,such as absorption range,HoMo energy level,miscibility,and ***,the high cost and poor batch-to-batch reproducibility of polymer donors also hinder future large-scale *** emphasize the need to explore alternative types of polymer *** imide-functionalized building units possess several key attributes that make their polymers highly promising for non-fullerene *** attributes include ease of synthesis,strong electron-withdrawing ability,rigid and co-planar structure,and the ability to easily tune solubility through imide side *** this review,we summarized the synthetic routes of imide building units,and the structural evolution of imide-functionalized polymer donors by focusing on the effects of polymer structure on their physical,optoelectronic,and photovoltaic *** hope that this mini-review will serve as a catalyst for future research on imide-functionalized polymers toward high-performance,cost-effective,and durable organic solar cells(oscs).

关键词： Imide Polymer donors Organic solar cells Synthetic routes Polymer structure evolution

Extraction of scandium from red mud by modified activated carbon and kinetics study

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

Rare Metals 2008年第3期27卷 223-227页

作者： ZHOU Hualei li dongyan TIAN Yajun CHEN Yunfa State Key Laboratory of Multi-phase Complex System lnstituteqfProcess Engineering Chinese Academy of Sciences Beijing 100080 China School of Applied Sciences University of Science and Technology Beo＇ing Beijing 100083 China

Activated carbon （AC） was modified by tri-butyl phosphate （TBP） for selectively extracting scandium from red mud and characterized by BET （Brunauer-Emmett-Teller） surface area. The modified AC had a preferential adsorption to scandium. The influences of adsorbent dos- age, adsorption temperature, and time on adsorption capacity and selectivity to scandium were examined. An optimum adsorbent dosage （-6.25 g/L）, adsorption temperature （308 K）, and adsorption time （40 min） were figured out. A pseudo-second-order kinetics model was employed for describing the adsorption process of scandium.

关键词： modified activated carbon adsorption red mud scandium

Catalytic performance of hybrid Pt@ZnO NRs on carbon fibers for methanol electro-oxidation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2017年第12期25卷 1871-1876页

作者： dongyan li Chen Gu Feng Han Zhaoxiang Zhong Weihong Xing Department of Chemical Engineering and Materials Nanjing Polytechnic Institute State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation Membrane Nanjing Tech University

A novel Pt@ZnO nanorod/carbon fiber （NR/CF） with hierarchical structure was prepared by atomic layer deposition combined with hydrothermal synthesis and magnetron sputtering （MS）. The morphology of Pt changes from nanoparticle to nanorod bundle with controlled thickness of Pt between 10 and 50 nm. Significantly, with the increase of voltage from 0 to 0.6 V （vs. standard calomel electrode）, the prompt photocurrent generated on ZnO NR/CF increases from 0235 to 0.725 mA. Besides, the Pt@ZnO NR/CF exhibited higher electrochemical active surface area （ECSA） value, better methanol oxidation ability and CO tolerance than Pt@CF, which demonstrated the importance of the multifunctional ZnO support. As the thickness of Pt increasing from 10 to 50 rim, the ECSA values were improved proportionally, leading to the improvement of methanol oxidation ability. More importantly, UV radiation increased the density of peak current of Pt@ZnO NR/CF towards methanol oxidation by additional 42.4%, which may be due to the synergy catalysis of UV light and electricity.

关键词： Carbon fibers ZnO nanorods Pt Magnetron sputtering Methanol electro-oxidation

Large-scale synthesis of hierarchical MnO_2 for benzene catalytic oxidation

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第3期12卷 71-75页

作者： dongyan li Genli Shen Wenxiang Tang Haidi liu Yunfa Chen State Key Laboratory of Multi-phase Complex System Institute of Process EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences

Hierarchical sea-urchin-shaped manganese oxide microspheres were synthesized via a facile method based on the reaction between KMnO4 and MnSO4 in HNO3 solution at 50℃. The average diameter of the microspheres is -850 nm. The microspheres consist of a core of diameter of -800 nm and nanorods of width -50 nm. The nanorods exist at the edge of the core, The Brunauer-Emmett-Teller surface area of the sea-urchin-shaped microspheres is 259.4 m^2/g. A possible formation mechanism of the hierarchical sea-urchin-shaped microspheres is proposed. The temperature for 90% conversion of benzene （T90%） on the hierarchical urchin-shaped MnO2 microspheres is about 218 ℃.

关键词： Manganese oxide Hierarchical Catalyst Benzene

The Role of Fracture Structure in Leachate Pollution at Landfills:A Case Study of a Landfill in Chongqing City

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2008年第5期82卷 1020-1026页

作者： LUO Yunju liU dongyan li Xiulan ZHU Zhengwei College of Civil Engineering Chongqing University Chongqing 400045

This paper studies a landfill where there are three faults running through. As serious pollution has occurred to the geological environment, the landfill is to be closed up and renovated. The paper aims to explore the role of fracture structure in leachate pollution at the landfill. The research was carried out in several stages. First, mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established. And then, the boundary conditions and parameters of the two mathematical models were determined. The groundwater level of the landfills was simulated in order to modify the two mathematical models. As a result, a feasible mathematical model was achieved. Based on this model, a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly, the impacts of the fracture structure on the pollution of leachate at the landfills could be identified. The study results show that while faults contribute to the migration of ieachate, they also serve as a confluence of leachate, thus further deteriorating the environment. The COD concentrations of the inside leachate and the outside leachate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post-renovation landfill. Therefore, measures must be taken to handle the ieachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control.

关键词： landfill fracture structure leachate COD concentration seepage

Design and synthesis of porous non-noble metal oxides for catalytic removal of VOCs

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第9期58卷 1359-1366页

作者： Wenxiang Tang Gang liu dongyan li Haidi liu Xiaofeng Wu Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences

The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the resultant potential applications for the degradation of volatile organic compounds(VOCs). The structure-activity relationships have been well-studied and used to facilitate design of the structure and composition of highly active catalysts. Recently, non-noble metal oxides with porous structures have been used as catalysts for deep oxidation of VOCs, such as aromatic hydrocarbons, aliphatic compounds, aldehydes, and alcohols, with comparable activities to their noble metal counterparts. This review summarizes the growing literature regarding the use of porous metal oxides for the catalytic removal of VOCs, with emphasis on design of the composition and structure and typical synthetic technologies.

关键词： VOCs catalytic oxidation non-noble metal oxides structure-activity relationships synthetic methods

Recent advances in two-dimensional photovoltaic devices

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2024年第5期45卷 26-40页

作者： Haoyun Wang Xingyu Song Zexin li dongyan li Xiang Xu Yunxin Chen Pengbin liu Xing Zhou Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057China Optics Valley Laboratory Wuhan 430074China

Two-dimensional(2D)materials have attracted tremendous interest in view of the outstanding optoelectronic properties,showing new possibilities for future photovoltaic devices toward high performance,high specific power and *** recent years,substantial works have focused on 2D photovoltaic devices,and great progress has been ***,we present the review of recent advances in 2D photovoltaic devices,focusing on 2D-material-based Schottky junctions,homojunctions,2D−2D heterojunctions,2D−3D heterojunctions,and bulk photovoltaic effect ***,advanced strategies for improving the photovoltaic performances are demonstrated in ***,conclusions and outlooks are delivered,providing a guideline for the further development of 2D photovoltaic devices.

关键词： two-dimensional materials photovoltaic devices photodetectors solar cells heterostructures

UN Reform to Improve Global Governance Capacity

在线全文

学校读者我要写书评

暂无评论

Contemporary World 2022年第6期 34-37页

作者： li dongyan the Institute of World Economics and Politics of the Chinese Academy of Social Sciences

The reform of the United Nations(UN)faces increasing urgency and uncertainty,as major-power competition has intensified and particularly the Russia-Ukraine conflict broke out,not to mention multiple global challenges such as the COVID-19 pandemic,climate change and extreme natural disasters,which also present fresh challenges to the position and role of the *** the one hand,stronger voices have sought to sound a pessimistic tone about the UN.

关键词： intensified extreme stronger