the Applicability of the Monetary Policy Rules and the Volatility of the Asset Price——Based on the New Keynesian DSGE Model

货币政策规则对于中央银行而言，是具有连续性和系统性的指导准则，对货币政策规则的研究，关乎国家经济的有效调控。从上世纪20年代美国的经济大萧条到上世纪90年代日本的房地产泡沫，从2008年全球经济危机中我国的4万亿计划到近年我国央行为应对股票市场剧烈波动频繁进行公开市场操作，无一不说明着货币政策始终关注资产价格波动，稳定资产价格波动是央行的一大政策目标。 本文通过文献综述阐述了货币政策规则对货币当局的重要性，并介绍了学者们对货币政策规则的研究，归纳对比了国内学者们关于中国货币政策规则适用性的研究，总结出这些学者们得出不同结论的部分原因。并在文献综述中，分析了在货币政策规则中加入资产价格项的原因...For central banks, monetary policy rules are guideline and full of continuity and systematicness. Researches of monetary policy rules relate to the economic adjustment about the country. From the Great Depression in the 1920s to the estate bubble in Japan in the 1990s, from the 4 trillion investment program in China in the global economic crisis of 2008 to the frequent monetary and open market ope...学位：经济学硕士院系专业：经济学院_数量经济学学号：1722013115200

Corrosion environment evaluation and durability design requirements of coastal concrete bridge

依据JTg/T b07—01—2006《公路工程混凝土结构防腐技术规范》和gb/T 50476—2008《混凝土结构耐久性设计规范》,结合海南一个沿海混凝土大桥的具体环境条件和工程结构情况,对大桥所处腐蚀环境评价中环境分区、环境作用分级以及耐久性设计要求等问题进行了研究。大桥的环境作用分为一般环境、土中环境、海洋环境和滨海环境四个区域。一般环境处于海南东北部沿海腐蚀偏高范围,腐蚀性较高,分级提高加以考虑。土中环境主要由于砖红壤地质腐蚀加重的影响,在工程详细勘探和耐久性设计时给于关注。海洋环境由于海南炎热地区水温高、盐度高会加重腐蚀,耐久性设计中给于考虑。滨海环境主要考虑海洋大气影响范围扩大、影响程度增高、海水入侵和盐渍化影响会不断扩大范围和程度等,对滨海大气和滨海土壤环境的耐久性加以重视。在大桥的设计、施工的不同阶段贯彻和实施规范的技术措施是保证耐久性的关键,对特殊形式和部位的构件和结构耐久性要给于专门措施。According to JTG/T B07—01—2006"Specification for deterioration prevention of highway concrete structures"and GB/T 50476—2008"Code for durability design of concrete structures",The corrosion environmental classification,environmental action grade and durability design requirements of a coastal concrete bridge in Hainan province are researched combining the bridge environment condition and engineering structure.The environment condition of the bridge is divided into four districts:the general environment,soil environment,ocean environment and coastal environment.The general environment is placed in northeast coast of Hainan and belongs to higher corrosion scope.The corrosion is higher so the grade is exalted.The influence in soil environment mainly is the Latosols geology corrosion.at the detailed investigation and design this must pay attention.because of in the south blazing hot region,the water temperature is high and the salt degree is high so the ocean environment will aggravate corrosion,the durability design must considered.The coastal environment mainly considers the ocean atmosphere spread,increasing corrosion degree,the sea water invading and salinization.The durability of the coastal atmosphere and coastal soil environment should be attached importance to.At the different stage of bridge design and construction the specialized technique measure is the key that promises durability.The special form and the part of bridge must carry out the specialized measure

Hollow micro/nanostructures metal oxide as advanced anodes for lithium-ion batteries

电动汽车和智能电网的快速发展对锂离子电池提出了更高的要求,即在拥有高能量密度和高功率密度的同时,兼有快速充放电和较高的安全性能。电极材料是电池性; 能的关键,金属氧化物因为拥有较高的比容量和安全性能,已经成为有希望替代传统商用石墨负极的新型电极材料。然而,金属氧化物负极的循环结构稳定性较差、; 电导率低,由此导致差的循环及倍率性能,极大地阻碍了其商业化应用。近年来,拥有微纳米空心结构的金属氧化物显示出了优异的电化学性能。本文介绍了制备空; 心结构金属氧化物的常用方法,讨论了各种方法的优缺点,并列举了常见空心结构金属氧化物作为锂离子电池负极时的性能表现,最后对空心结构金属氧化物未来的; 发展方向和发展前景予以展望。More efforts are needed to upgrade the performances of lithium-ion; batteries (LIBs) for their further applications in various large; electrical appliances such as electric vehicles and smart grid as these; devices require high capacity, power density, high rate capability and; especially safety. Electrode materials are the key to the performance of; LIBs. Recently, metal oxides with much higher capacities and better; safety have the prospect of becoming alternative anode materials of; commercial graphite. However, the intrinsic low charge/ionic; conductivity and poor cycling structural stability lead to poor cycling; and rate performances, which greatly hinder their commercial; applications. To overcome these disadvantages of metal oxide anodes for; LIBs, several strategies have been developed during the past decade.; Among them, metal oxide hollow micro-nanostructures exhibit excellent; electrochemical properties as anode material for LIBs. In this review,; we first describe the current commonly preparation methods to synthesize; metal oxide hollow structures and comment on their advantages and; shortages. According to some typical examples, we show the promising use; of metal oxides hollow-structured anode materials for LIBs. Finally, the; direction and prospect of metal oxide hollow micro-nanostructures using; as anode materials are further discussed.国家重点研究计划纳米科技重点专项; 国家自然科学基金; 福建省自然科学基金项目; 厦门大学校长基

富锂锰基正极材料研究进展

目前富锂锰基正极材料以其高比容量(>250mAh/g)、高工作电压、低成本、环境友好等优点受到了学术界的极大关注,是极具潜力的下一代锂离子电池正极材料。然而,循环过程中富锂锰基正极材料存在首次库仑效率低、倍率性能差、容量与电压衰减严重等缺点,使其实际应用受到了极大限制。经过几年来的深入研究,人们对富锂锰基正极材料的理论认识逐步加深,发展了针对富锂锰基正极材料各种缺点的改性方法,取得了一系列重要进展。本文总结了近几年来学术界在富锂锰基正极材料方面的重要研究进展,包括放电比容量、首次库仑效率、循环性能、倍率性能、电压稳定性,总结了针对富锂锰基正极材料的各种实验表征手段。此外,还介绍了富锂锰基正极材料在理论研究方面的重要方法以及在全电池方面的应用。最后,基于目前的实验进展和理论认知,对富锂锰基正极材料今后的发展进行了展望。国家重点研发计划“纳米科技”重点专项(2016YFA0202600

深厚覆盖层潜蚀对大坝应力变形影响的有限元模拟

深厚覆盖层坝基潜蚀不一定导致坝基的渗透破坏。但坝基砂砾石土内部细颗粒的流失，一方面会增大土体的渗透性；另一方面可降低土体的强度和变形模量。前者导致坝基坝体渗流场的变化，从而引起坝体变形和应力变化，后者变形模量衰化，导致坝基坝体变形和应力调整。潜蚀造成的坝基和坝体应力变形对大坝的正常使用和安全性带来一定负面影响，定量评估这种影响是内部不稳定砂砾石深厚覆盖层坝基采用悬挂式防渗墙处理方案设计和该类大坝运行管理的迫切需求。提出了潜蚀对大坝应力变形影响的模拟方法，对一个典型大坝设计方案进行了计算分析，该设计方案中潜蚀造成应力变形变化的两种机制中，渗流场变化机制对坝基坝体的应力变形改变远大于模量衰化造成的影响。总体上该方案潜蚀造成的坝体变形和应力变化并未显著降低坝体的安全性

高土石坝复合加筋抗震措施大型振动台模型试验与数值模拟

针对我国西部强震区水电工程建设中高土石坝抗震安全这一突出问题, 提出了一种高土石坝复合加筋抗震措施, 通过未加筋模型坝和复合加筋模型坝大型振动台对比试验, 验证了复合加筋抗震措施的有效性和可靠性, 并结合数值模拟探讨了复合加筋抗震措施的加固机制. 研究结果表明: 相比于未加筋模型坝, 复合加筋抗震措施对坝顶加速度响应具有一定的抑制作用, 能够有效抑制坝顶堆石松动和滑移, 减小坝体地震永久变形. 数值模拟分析进一步表明, 坝顶复合加筋区域剪应变幅值和分布规律发生了明显的改变, 较大的剪应变形成在坝内筋材前端, 即潜在滑动面由未加筋的浅层滑动转变为深层滑动, 因此, 高土石坝复合加筋抗震措施提高了大坝的抗震安全性. 研究成果可为强震区高土石坝的抗震设计提供借鉴. The aseismic safety of high earth rockfill dams is an important problem in engineering construction in the intensive earthquake area of West China. A composite reinforcement aseismic measure (CRAM) for high earth rockfill dams was developed. The CRAM’s effectiveness and reliability were validated using comparative model tests on a large-scale shaking table. Numerical simulation was used to examine the CRAM’s reinforcement mechanism. The results demonstrated that the CRAM had an inhibiting effect on the acceleration response; the CRAM can effectively inhibit the loosening and slipping of rockfill at the crest and reduce earthquake-induced permanent deformation. The numerical simulation also revealed that the shear strain amplitude and distribution were significantly altered. A slightly larger shear strain appeared at the front of the CRAM’s internal reinforcement materials, and the dam slope’s potential sliding surface was transformed from shallow sliding to deep sliding. As a result, the CRAM can improve the high earth rockfill dam’s seismic safety. The research results can provide a reference for the seismic design of the high rockfill dam in the intensive earthquake area. © 2022 Chinese Academy of Sciences. All rights reserved

一种砂砾石土管涌侵蚀过程中渗透系数动态变化模型

本发明公开了一种砂砾石土管涌侵蚀过程中渗透系数动态变化模型，用于描述土体渗透性变化。该模型为：k/k0＝[(φ′/φ0)3(d′p/dp)2]β，其中k为管涌动态发展过程中的渗透系数，k0为初始渗透系数，φ′、d′p分别为管涌动态发展过程中土体的孔隙率、颗粒级配曲线上重量含量p％所对应的颗粒粒径，φ、dp分别为土体的初始孔隙率、初始颗粒级配曲线上重量含量p％所对应的颗粒粒径，β为孔隙特征放大指数

中空夹层薄壁钢管混凝土短柱轴压性能研究

进行了9个轴压短柱的试验研究,考察空心率和径厚比对方套圆中空夹层薄壁钢管混凝土轴压短柱力学性能的影响。试验发现中空夹层薄壁钢管混凝土轴压短柱具有较好的延性和较高的承载力。接着对中空夹层薄壁钢管混凝土轴压短柱进行了数值模拟,数值模拟结果与实测结果吻合良好。机理分析表明:外钢管的约束效果主要集中在角部,纵向加劲肋可很好地提高外钢管的承载力。参数分析表明中空夹层薄壁钢管混凝土轴压短柱的承载力随着钢管屈服强度、混凝土强度或径厚比的增大而增大;构件的延性随着空心率的增大而增大。最终建议了中空夹层薄壁钢管混凝土轴压短柱承载力的简化计算公式