搜索到7789篇“ MICA“的相关文章
欧盟MiCA法案评述及启示
2024年
为构建统一的加密资产市场监管格局,欧盟于2023年出台了《加密资产市场监管法案》,即MiCA法案。该法案作为欧盟数字金融战略一揽子计划的一部分,明确了法案的适用对象范围、加密资产的分类、监管主体及相应的信息报告制度、营业限制制度以及行为监管制度等,是迄今为止最全面的数字资产监管框架。文章在肯定MiCA法案重要意义的同时,也揭示其在适用对象、统一适用性程度以及稳定币的监管合作等方面可能存在的局限性。文章最后阐述MiCA法案对我国在完善对加密资产的监管思路、建立健全加密资产的法律监管框架、加大国际间的监管合作等方面的借鉴意义。
龚淋
关键词:MICA
ANF/mica复合绝缘纸的制备及性能分析
2024年
以芳纶纳米纤维(ANF)为基体,天然云母(mica)为填料,通过真空辅助抽滤和热压技术制备了ANF/mica复合绝缘纸,并系统研究了复合绝缘纸的微观形貌、拉伸特性、电绝缘性能以及耐温性能。结果表明:mica与ANF在真空抽滤过程中有序叠加,mica碎片有效填补了纸张中的空隙,形成致密的“砖泥结构”,显著提高了复合绝缘纸的电气强度和绝缘性能。此外,纯ANF绝缘纸和ANF/mica-10复合绝缘纸的玻璃化转变温度均高于300℃,展现出优异的热稳定性。虽然mica的加入稍微降低了纯ANF绝缘纸的拉伸性能,但其绝缘强度和拉伸性能仍明显优于传统云母纸。
赵莉华滕富莉魏佳高萌卞超卓然卿湫惋喻任俊文
关键词:电气强度
加密资产服务提供者的监管优化——欧盟MiCA镜鉴与中国方案被引量:1
2024年
加密资产服务提供者是以加密资产为载体,通过区块链技术为公众提供金融服务的主体。当前,区块链金融已成为各国争相布局的战略性产业。优化加密资产服务提供者的法律监管,是推进中国区块链金融稳步健康发展、突破数字经济发展瓶颈的关键环节。欧盟MiCA围绕加密资产服务提供者制定了系统性的监管规则,能为中国解决上述问题提供启示。因此,可以MiCA为镜鉴,构建以金监局为核心的跨部门有序协作机制,制定全方位的事前授权许可制度,实施分级分类的智慧监管,强化行政强制措施与行政处罚的力度。这不但能为中国区块链金融的稳健发展保驾护航,还有助于提升金融科技领域的国际制度性话语权,发挥全球引领作用。
谢迪扬马忠法
关键词:MICA欧盟
Impact of mica on geotechnical behavior of weathered granitic soil using macro and micro investigations被引量:1
2024年
The micaceous weathered granitic soil(WGS)is frequently encountered in civil engineering worldwide,unfortunately little information is available regarding how mica affects the physico-mechanical behaviors of WGS.This study prepares reconstituted WGS with different mica contents by removing natural mica in theWGS,and then mixes it with commercial mica powders.The geotechnical behavior as well as the microstructures of the mixtures are characterized.The addition of mica enables the physical indices of WGS to be specific combinations of coarser gradation and high permeability but high Atterberg limits.However,high mica content in WGS was found to be associated with undesirable mechanical properties,including increased compressibility,disintegration,and swelling potential,as well as poor compactability and low effective frictional angle.Microstructural analysis indicates that the influence of mica on the responses of mixtures originates from the intrinsic nature of mica as well as the particle packing being formed withinWGS.Mica exists in the mixture as stacks of plates that form a spongy structure with high compressibility and swelling potential.Pores among the plates give the soil high water retention and high Atterberg limits.Large pores are also generated by soil particles with bridging packing,which enhances the permeability and water-soil interactions upon immersion.This study provides a microlevel understanding of how mica dominates the behavior of WGS and provides new insights into the effective stabilization and improvement of micaceous soils.
Xianwei ZhangXinyu LiuHaodong GaoGang WangRan AnZhu Liang
关键词:MICA
Case Analysis of Tianqi Lithium Corp’s Acquisition of Sociedad Química y Minera
2024年
Enterprise mergers and acquisitions(M&A)are vital strategies for companies worldwide to expand markets,enhance competitiveness,and achieve strategic goals.The Chinese government’s strong support for the new energy industry has created a favorable policy environment for the development of the lithium battery sector.Against this backdrop,Tianqi Lithium Corp’s acquisition of Sociedad Química y Minera(SQM)in Chile has garnered widespread attention.This paper takes Tianqi Lithium Corp’s acquisition of SQM as the research subject,conducting a detailed analysis of the motives behind the M&A.Subsequently,financial indicators are employed to conduct a performance analysis from a financial perspective,examining the impact of the M&A.Finally,based on the findings of the case analysis,relevant suggestions are proposed to offer a reference for the development of enterprise mergers and acquisitions.
Jiaqi Zhang
Effect of metal fractions on rice grain metal uptake and biological parameters in mica mines waste contaminated soils
2024年
Heavy metals from mica waste not only deteriorate the soil quality but also results in the uptake of metals in the crop.The present investigation was conducted to evaluate the effects of different fractions of metals on the uptake in rice,soil microbial and biochemical properties in mica waste-contaminated soils of Jharkhand,India.From each active mine,soil samples were randomly collected at distances of<50 m(zone 1),50–100 m(zone 2),and>100 m(zone 3).Sequential metal extraction was used to determine the fractions of different metals(nickel(Ni),cadmium(Cd),chromium(Cr)and lead(Pb))including water-soluble(Ws)and exchangeable metals(Ex),carbonate-bound metals(CBD),Fe/Mn oxide(OXD)bound metals,organically bound metals(ORG),and residues(RS).The Ni,Cr,Cd and Pb in rice grain were 0.83±0.41,0.41±0.19,0.21±0.14 and 0.17±0.08 mg/kg respectively.From the variable importance plot of the random forest(RF)algorithm,the Ws fraction of Ni,Cr and Cd and Ex fraction of Pb was the most important predictor for rice grain metal content.Further,the partial dependence plots(PDP)give us an insight into the role of the two most important metal fractions on rice grain metal content.The microbial and enzyme activity was significantly and negatively correlated with Ws and Ex metal fractions,indicating that water-soluble and exchangeable fractions exert a strong inhibitory effect on the soil microbiological parameters and enzyme activities.
Saibal GhoshSandip MondalJajati MandalAbhishek MukherjeePradip Bhattacharyya
Flexible mica films coated by magnetron sputtered insulating layers for high-temperature capacitive energy storage
2024年
High-temperature energy storage performance of dielectric capacitors is cru-cial for the next generation of power electronic devices.However,conduction losses rise sharply at elevated temperature,limiting the application of energy storage capacitors.Here,the mica films magnetron sputtered by different insulating layers are specifically investigated,which exhibit the excellent high-temperature energy storage performance.The experimental results revealed that the PbZrO3/Al2O3/PbZrO3(PZO/AO/PZO)interface insulating layers can effec-tively reduce the high-temperature leakage current and conduction loss of the composite films.Consequently,the ultrahigh energy storage density(Wrec)and charge‒discharge efficiency(η)can be achieved simultaneously in the flexi-ble mica-based composite films.Especially,PZO/AO/PZO/mica/PZO/AO/PZO(PAPMPAP)films possess excellent Wrec of 27.5 J/cm3 andηof 87.8%at 200◦C,which are significantly better than currently reported high-temperature capaci-tive energy storage dielectric materials.Together with outstanding power density and electrical cycling stability,the flexible films in this work have great appli-cation potential in high-temperature energy storage capacitors.Moreover,the magnetron sputtering technology can deposit large-area nanoscale insulating layers on the surface of capacitor films,which can provide technical support for the industrial production of capacitors.
Chao YinTiandong ZhangChanghai ZhangYue ZhangChang Kyu JeongGeon-Tae HwangQingguo Chi
关键词:MICA
肺炎支原体肺炎患儿血清MICA、OPN水平及其与反复呼吸道感染的相关性研究
2024年
目的探究肺炎支原体肺炎患儿血清主要组织相容性复合物Ⅰ链相关基因A(MICA)、骨桥蛋白(OPN)水平及其与反复呼吸道感染的相关性。方法选取该院2019年3月至2021年3月收治的肺炎支原体肺炎患儿106例作为研究组,另选取同期于该院进行体检的健康儿童106例作为对照组,根据肺炎支原体肺炎患儿是否发生反复呼吸道感染分为反复呼吸道感染发生组和反复呼吸道感染未发生组;使用全自动微生物鉴定系统和纸片扩散试纸进行病原菌检测以及耐药性试验;血清MICA、OPN水平检测采用酶联免疫吸附试验;采用多因素Logistic回归分析影响肺炎支原体肺炎反复呼吸道感染发生的危险因素;绘制受试者工作特征(ROC)曲线分析血清MICA、OPN单独及联合检测对肺炎支原体肺炎患儿发生反复呼吸道感染的预测价值。结果106例肺炎支原体肺炎患儿共分离出116株菌株,其中革兰阴性菌77株(66.38%),包括流感嗜血杆菌29株(25.00%),肺炎克雷伯菌17株(14.66%),鲍曼不动杆菌14株(12.07%),铜绿假单胞菌8株(6.90%),阴沟肠杆菌6株(5.17%),其他菌3株(2.59%);革兰阳性菌39株(33.62%),包括金黄色葡萄球菌16株(13.79%),表皮葡萄球菌10株(8.62%),肠球菌6株(5.17%),溶血葡萄球菌5株(4.31%),其他菌2株(1.72%)。流感嗜血杆菌耐药率较高的为头孢哌酮,占75.86%,肺炎克雷伯菌耐药率较高的为氨苄西林,占88.24%。16株金黄色葡萄球菌中,对红霉素耐药12株(75.00%),对环丙沙星耐药8株(50.00%),对四环素耐药6株(37.50%),对苯唑西林耐药4株(25.00%),对克林霉素耐药2株(12.50%),未发现对万古霉素和利奈唑胺耐药的金黄色葡萄球菌。研究组血清MICA、OPN水平均明显高于对照组,差异均有统计学意义(P<0.05)。46例患儿发生反复呼吸道感染,60例患儿未发生反复呼吸道感染。反复呼吸道感染发生组使用药物不当比例,血清MICA、OPN水平均明显高于反复呼吸道感染未发�
梁文婷霍开明古裕鸟吴小红
关键词:肺炎支原体肺炎骨桥蛋白反复呼吸道感染
LncRNA MEG8通过靶向miR-15a-5p调控MICA/B介导结直肠癌细胞免疫逃逸
2024年
目的:探究长链非编码RNA母系表达基因8(LncRNA MEG8)通过靶向miR-15a-5p调控MHCⅠ类相关蛋白A/B(MICA/B)介导的结直肠癌(CRC)细胞免疫逃逸机制。方法:RT-qPCR、Western blot检测CRC组织和细胞系MEG8、miR-15a-5p、MICA、MICB、NKG2D蛋白水平;双荧光素酶实验验证MEG8对miR-15a-5p的调控关系;采用脂质体转染法将NC、MEG8、miR-NC、miR-15a-5p分别或共转染至SW480、SW620细胞,记为NC组、MEG8组、MEG8+miR-NC组、MEG8+miR-15a-5p组;将NK细胞分别与SW480、SW620细胞共培养;ELISA检测共培养液中TNF-α、IFN-γ水平;CCK-8、EdU染色、Transwell实验检测细胞增殖、迁移和侵袭能力;RT-qPCR、Western blot检测细胞MEG8、miR-15a-5p、MICA、MICB、NKG2D蛋白水平。结果:与癌旁组织或正常结肠上皮细胞相比,CRC组织和细胞系中MEG8、MICA、MICB、NKG2D mRNA和蛋白水平降低,miR-15a-5p水平升高(P<0.05)。MEG8靶向调控miR-15a-5p。共培养体系中,与NC组相比,MEG8组细胞MICA、MICB、NKG2D蛋白水平、共培养上清液中TNF-α、IFN-γ水平明显升高,培养1 d、2 d、3 d后,OD值、EdU阳性率、迁移和侵袭细胞数明显降低(P<0.05);过表达miR-15a-5p能部分逆转过表达MEG8对细胞MICA、MICB、NKG2D、TNF-α、IFN-γ水平和增殖、侵袭转移能力的影响(P<0.05)。结论:MEG8通过靶向miR-15a-5p调控MICA、MICB表达,促进NK细胞活性,抑制CRC细胞免疫逃逸。
李鸷吴迪田飞刘洁谢兴明
关键词:结直肠癌
云母微晶玻璃的研究与应用进展被引量:1
2024年
云母微晶玻璃是一种独特的玻璃陶瓷复合材料,一般通过对K2O-MgO-MgF2-Al_(2)O_(3)-SiO_(2)体系玻璃进行热处理而获得,这一过程使其主要以云母晶体为主晶相,形成具有特殊片层状结构的微晶玻璃。系统地介绍了云母微晶玻璃的组成体系、制备方法,以及其微观结构与性能的研究进展,特别关注的是其独特的可切削性能,其层片状结构为其赋予了出色的可切削特性,使其能够通过各种加工手段制成精密尺寸、精密配合和复杂形状的构件。重点总结了云母微晶玻璃在生物组织、高精度结构件、真空电子器件等领域展现出是卓越的应用能力,并对云母微晶玻璃的发展趋势进行了展望。
杜文浩肖卓豪崔久治黄新华李秀英孔令兵艾军付震
关键词:云母微晶玻璃生物组织真空电子器件

相关作者

余平
作品数:136被引量:337H指数:9
供职机构:中南大学湘雅医学院基础医学院
研究主题:沙眼衣原体 沙眼衣原体感染 MICA MICA基因 基因多态性
周智锋
作品数:59被引量:196H指数:9
供职机构:福建医科大学
研究主题:MICA NK细胞 自然杀伤细胞 树突状细胞 乳腺肿瘤
罗奇志
作品数:61被引量:98H指数:5
供职机构:中南大学
研究主题:MICA 基因 MICA基因 白血病 免疫学
叶韵斌
作品数:207被引量:546H指数:11
供职机构:福建医科大学
研究主题:树突状细胞 肝癌 NK细胞 乳腺肿瘤 自然杀伤细胞
梅冰
作品数:44被引量:120H指数:6
供职机构:荆州市中心医院
研究主题:MICA MICA基因 基因多态性 多态性 糖皮质激素受体