搜索到112440篇“ MODIFICATION“的相关文章
Modification of MgO-CaO Clinkers for Hydration Resistance
2025年
Mgo-Cao refractories are widely used in the iron and steel metalurgy industry due to their advantages of purifying molten steel,high refractoriness,good thermal shock resistance,and excellent corrosion resistance to basic slags.However,hydration occurs during the manufacturing,storage,and transportation of refractories,which severely limits their application.Mgo-CaO clinker is the main raw material for Mgo-Cao refractories,and its hydration resistance determines the development of the latter case.Herein,the Mgo-Cao clinker was modified using myristic acid as the modifying agent by the liquid-phase deposition method.The effects of the particle size of the raw materials,concentration of myristic acid,treatment temperature and time on the phase composition and hydration resistance of the modified Mgo-Cao clinkers were investigated in detail.The results show that the samples with an agent concentration of 0.25 mol L^(-1) and treated at 25℃ for 1 h exhibit the optimal hydration resistance properties,namely a low hydration mass gain rate(0.23%)and a large water contact angle(152.9).
SHE AixinLI NingboHUANG RenHUANG ZhongZHANG Haijun
“三码合一”电子延期技术在人工影响天气作业火箭弹上的应用
2025年
【目的】为保证人工影响天气作业的安全,需要对人工影响天气作业火箭(简称“人影火箭”)弹药安全产品从生产到使用整个过程中的所有信息进行跟踪查询。当前主流产品质量安全系统控制方式高度集中化、数据易被篡改,未能达到预期的产品质量监督效果。为保障人影火箭作业安全、有效监管产品质量,构建了“三码合一”安全管理平台。【方法】基于加密管理器、电子延期芯片、安全锁定器和密码管理平台,设计一个覆盖国家、省、市、县、作业点、厂家的六级人影火箭作业安全管理平台。只有当芯片码、人影火箭码和发射密码三码相互匹配且采用指令点火时,人影火箭才能正常发射。【结果】“三码合一”安全管理平台通过整合多维度数据,提高信息采集的广度与深度,从而实现对产品质量的全方位监督与验证。【结论】“三码合一”安全管理平台为人影安全风险预警预测、安全防控和动态监督提供数据服务,为全国人影工作安全运行提供坚实的信息化保障。
周建中胡磊曹烤邵文政刘丹玲
关键词:人工影响天气作业安全
A facile nanopattern modification of silk fibroin electrospun scaffold and the corresponding impact on cell proliferation and osteogenesis
2025年
As a well-known natural protein biomaterial,silk fibroin(SF)has shown broad application prospects in typical biomedical fields.However,the mostly used SF from Bombyx mori silkworm lacks specific cell adhesion sites and other bioactive peptide sequences,and there is still significant room for further improvement of their biological functions.Therefore,it is crucial to develop a facile and effective modification strategy for this widely researched biomaterial.In this study,the SF electrospun scaffold has been chosen as a typical SF biomaterial,and air plasma etching has been adopted as a facile nanopattern modification strategy to promote its biological functions.Results demonstrated that the plasma etching could feasibly and effectively create nano-island-like patterns on the complex surface of SF scaffolds,and the detailed nanopattern features could be easily regulated by adjusting the etching time.In addition,the mesenchymal stem cell responses have illustrated that the nanopattern modification could significantly regulate corresponding cell behaviors.Compared with the non-etched scaffold,the 10min-etched scaffolds(10E scaffold)significantly promoted stem cell proliferation and osteogenic differentiation.Moreover,10E scaffold has also been confirmed to effectively accelerate vascularization and ectopic osteogenesis in vivo using a rat subcutaneous implantation model.However,the mentioned promoting effects would be weakened or even counteracted with the increase of etching time.In conclusion,this facile modification strategy demonstrated great application potential for promoting cell proliferation and differentiation.Thus,it provided useful guidance to develop excellent SF-based scaffolds suitable for bone and other tissue engineering.
Xiaojiao LiuQinjun OuyangXiang YaoYaopeng Zhang
我国云物理与人工影响天气云室实验研究进展及展望
2025年
云室是开展云降水物理和人工影响天气实验研究的重要装置,在基础科学原理和播云技术研究中发挥着不可替代的作用。我国开展云降水物理云室实验已经超过60年,取得了一些重要成果和经验,并得到国内外同行的普遍认可。本文在总结对比美国、欧洲等国家的云室及其开展云物理研究的基础上,系统梳理了我国开展室内实验以来,在研发、利用云室开展大气冰核、人工冰核研究、特别是人工影响天气催化剂成核率检测、催化剂及催化技术研发和云降水物理机制研究与应用等方面取得的进展,讨论了专门性和综合性云室研发建设、云气溶胶降水相互作用等云微物理机制和过程、跨学科与交叉学科研究及监测仪器设备等方面存在的问题和发展方向,可为我国建设高性能云室和利用云室开展实验研究、促进云降水物理和人工影响天气科学发展提供重要参考。
邓育鹏苏正军彭敏周学思崔毅赵利伟李林
关键词:云室人工影响天气
聚乳酸增韧改性的进展
2025年
随着石化资源的日益短缺和环境污染越来越严重,聚乳酸(PLA)作为一种绿色可降解材料,得到了研究人员的高度关注,但是,PLA在实际应用中存在脆性较大的问题。基于该问题,综述了近年来PLA增韧改性的研究现状及进展。通过阐述PLA的化学及物理增韧改性及其效果,对比了不同改性方法的特点及缺陷,分析并总结了PLA在增韧改性过程中存在的问题,除此以外,对PLA增韧改性研究未来的发展方向进行了展望。
张月莉陈英哲雷雅铄隋欣言王耀彬任亮
关键词:聚乳酸增韧化学改性物理改性
蔗糖异构酶的制备及修饰研究进展
2025年
异麦芽酮糖作为一种新型的功能性糖,具有低热量、防龋齿、易吸收、消化慢等特性,是糖尿病和肥胖者可食用的糖,可广泛应用于食品、医药和化妆品行业。目前,异麦芽酮糖的制备方法主要有化学合成法、植物转基因法、微生物转化法及酶转化法,其中,近年来酶转化法成为新的研究热点,主要运用到蔗糖异构酶。该文综述了蔗糖异构酶产酶菌株的诱变育种、异源表达、分子改造以及酶的化学修饰等方式在制备异麦芽酮糖的研究进展,以期为相关研究工作的开展和工业化生产提供指导。
李敏尚继旭贾振华罗德平廖爱美
关键词:异麦芽酮糖诱变育种异源表达分子改造化学修饰
Effects of acupuncture needle modification on acupuncture analgesia
2025年
Objective The analgesic effect of acupuncture has been widely accepted.Nevertheless,the mechanism behind its analgesic effect remains elusive,thus impeding the progress of research geared toward enhancing the analgesic effect of acupuncture.This paper investigated the role of acupuncture needle surface textures on acupuncture’s analgesic effect by creating four experimental acupuncture needles with different patterns of surface augmentation.Methods Four types of acupuncture needles with different surface textures(the lined needle,circle needle,sandpaper needle,and threaded needle)were designed.Additionally,the force/torque measurement system used a robot arm and mechanical sensor to measure the force on the needle during insertion and manipulation.To perform acupuncture analgesia experiments,four experimental acupuncture needles and a normal needle were inserted into the Zusanli(ST36)acupoint of rats with inflammatory pain.By comparing the force and torque and the analgesic efficacy of the different acupuncture needles,these experiments tested the role of acupuncture needle body texture on acupuncture analgesia.Results The analgesic effects of different acupuncture needle body textures varied.Specifically,the force required to penetrate the skin with the lined needle was not greater than that for the normal needle;however,the needle with inscribed circles and the sandpaper-roughened needle both required greater force for insertion.Additionally,the torque of the lined needle reached 2×10^(-4)N·m under twisting manipulation,which was four times greater the torque of a normal needle(5×10^(-5)N·m).Furthermore,the lined needle improved pain threshold and mast cell degranulation rate compared to the normal needle.Conclusion Optimizing the texture of acupuncture needles can enhance acupuncture analgesia.The texture of our experimental acupuncture needles had a significant impact on the force needed to penetrate the skin and the torque needed to manipulate the needle;it was also linked to variable analgesic effects
Ming-zhu SunXin WangYing-chen LiYu-hang LiuYi YuLiu-jie RenWei GuWei Yao
天然橡胶乳液的改性及应用研究进展
2025年
天然橡胶乳液(NRL)资源丰富可再生、价廉、环境友好、综合性能良好,在电绝缘材料、轮胎制造、医疗器械、航空和食品包装等领域具有广阔的应用前景。NRL改性分为化学改性和物理改性,介绍了化学改性(卤化、环氧化、接枝共聚)和物理改性(添加天然高分子材料、纳米粒子)对NRL力学性能、粘接强度、热稳定性等的影响;综述了NRL在薄膜制品、胶粘剂、传感器及其他领域的应用进展,指出了NRL应用中存在的问题及改性发展方向。随着改性工艺的不断优化,NRL的研究将朝着低成本、高性能化方向发展。
马鹤龙黄煜琪王召霞赵蓉李冬娜马晓军
关键词:天然橡胶乳液化学改性物理改性
齿面修形量对面齿轮副啮合性能的影响
2025年
为了分析圆柱小轮修形量对面齿轮副啮合性能影响规律,首先借助圆柱小轮的加工齿条模型,获得了面齿轮副的齿面方程式;根据磨削修形砂轮的截面等距线完成了修形砂轮运动曲线的计算,并对圆柱小轮齿廓和齿向的修形量进行了求解;依据不同修形参数下圆柱小轮修形量的计算结果,分析了齿面修形量与修形参数的关系,并完成了不同修形量下面齿轮副的齿面接触分析,获得了圆柱小轮齿面不同修形量与啮合性能的关联规律,为面齿轮传动副的修形加工提供理论依据。
李大庆毛亚洲张宇轩王鑫聂少武
关键词:面齿轮修形量啮合性能
Advances in the chemical modification of nanocellulose for biodegradable plastics reinforcement
2025年
As non-degradable traditional plastics contribute to environmental pollution,biodegradable polymers have been identified as a promising alternative.However,inherent drawbacks such as low toughness,poor tensile strength,and reduced thermal degradation temperatures limit the further development of biodegradable polymers.Nanocellulose has the potential to enhance the properties of biodegradable polymers without compromising their biodegradability.However,the abundant hydroxyl groups in nanocellulose’s molecular chains result in poor compatibility with hydrophobic polymers,requiring surface modification prior to their combination.This review first introduces several common biodegradable polymers and three types of nanocellulose,followed by a comprehensive analysis of the recent advancements in the chemical modification methods of nanocellulose over the last five years.These methods encompass esterification,oxidation,silylation,and graft modification.The focus of this discussion is primarily on the modification strategies,enhancement effects,and mechanisms.Furthermore,the degradability and applications of modified nanocellulose composites are summarized.Finally,the main challenges hindering the development of chemically modified nanocellulose-reinforced biodegradable polymers are proposed.It is hoped that this review will inspire future researchers to develop industrially valuable chemically modified nanocellulose-reinforced biodegradable polymers.
Shuya ZhangMingda CheRenliang HuangMei CuiWei QiRongxin Su
关键词:NANOCELLULOSEDEGRADABILITYAPPLICATION

相关作者

张玉忠
作品数:302被引量:327H指数:9
供职机构:天津工业大学
研究主题:聚醚砜 吸附剂 分离膜 杂化膜 膜接触器
顾继友
作品数:498被引量:1,823H指数:22
供职机构:东北林业大学
研究主题:脲醛树脂 异氰酸酯 胶粘剂 改性 耐水性
钱春香
作品数:544被引量:2,661H指数:33
供职机构:东南大学
研究主题:混凝土 微生物 水泥基材料 矿化 胶质芽孢杆菌
党波
作品数:4被引量:30H指数:3
供职机构:西北工业大学材料学院凝固技术国家重点实验室
研究主题:COOLING_RATE A356 A356铝合金 EFFECTS AS-CAST
张雯
作品数:209被引量:604H指数:13
供职机构:福州大学生物科学与工程学院
研究主题:聚丙烯 双螺杆挤出 嵌段共聚物 回收料 表面改性