21世纪中国金融学教学改革与发展战略

国家教育部新世纪教改工程项目《21 世纪中国金融学专业教育教学改革与发展战略研究》, 目前已取得阶段性成果。2001 年8 月16 日至21 日, 承担该项目的中央财经大学、中国人民大学、厦门大学和复旦大学在青海省西宁市举行了成果交流和研讨会。项目主持人、中央财经大学副校长、金融学博士生导师王广谦教授主持了这次会议, 全国所有有金融学博士学位授权点的高校和科研院所都有代表出席大会, 用主持人的话来说, “全国金融学界顶尖级人物基本上都到了”。出席会议的还有教育部高等教育司刘凤泰副司长和杨志坚处长。与会专家学者回顾了近20 年国内外金融业的迅猛发展, 分析了在21 世纪随着经济全球化、金融国际化对我国经济金融带来的机遇和挑战, 以及对我国金融研究、金融学科建设和人才培养带来的冲击,大家认识到, 经过20 年的改革开放和发展, 目前我国在这些领域虽有长足的进步, 但仍远远不能适应形势发展的要求。要想把我国金融学科建设成国际一流学科, 培养出一流的高素质金融专业人才, 还必须进行一系列改革与创新。与会专家教授根据各自的教学实践, 提出了许多具有建设性的意见。研讨会上发言踊跃、气氛热烈, 不时出现不同观念的碰撞和不同观点的交锋, 对推进金融学科建设十分有益。下面将著名专家教授颇具代表性的观点( 按发言顺序) 择要摘发, 以飨读者, 以推动中国金融学科的建设与繁荣

气泡-水流两相流的激光多普勒法测量

为区分激光多普勒稀态两相流动测量中出现的流体相信号和颗粒(气泡、液滴)相信号,本文提出可见度和基座的复合判别法,并设计了专用的信号预处理器,此预处理器能将原始多普勒信号分为两路,分别代表两相,并可用计数型信号处理器测量每路的速度及其它统计量。使用本方案对矩形管道內低速气泡-水两相流的实验和测量表明,对两相的区分和测量是成功的。文中给出了两相速度、湍流度和气泡滑移速度的测量结果

A novel three-dimensional hydraulic fracturing model based on continuum-discontinuum element method

Based on continuum-discontinuum element method (CDEM), a three-dimensional hydraulic fracturing model which can consider simultaneously the continuum field, crack opening, pore seepage field and fracture seepage field is proposed in this paper. In this model, the CDEM method is used to calculate the continuum field and crack opening, and the finite volume method (FVM) is adopted to calculate the seepage field, in which the pore seepage is characterized by Darcy's law and the fracture seepage is expressed by the cubic law. Through the comparison and analysis with four analytical solutions and one experimental phenomenon, the fracture pattern is predicted accurately and the poroelastic stress is captured as well. In addition, the result of a disk with one injection hole suggests that this model can not only depict the fluid pressure distribution in fractures and pores of rock matrix, but also trace the initiation, propagation and intersection of cracks driven by fluid. (C) 2021 Elsevier B.V. All rights reserved

基于Bekker理论改进遗传算法的野外路径优化方法研究

随着装备智能化的发展，复杂野外环境下车辆的路径规划已成为关键技术之一，为军事力量发展、军事装备智能化提供重要保障。野外环境中有多种影响车辆行驶的因素，如障碍物、路面坑洼和泥泞等，传统城市道路的路径优化算法大多针对既有道路，难以满足在存在多种未知威胁的复杂野外环境下的路径优化要求。同时，目前路径优化算法对于野外复杂的土壤地质条件考虑较少，因此本文基于Bekker地面力学理论，结合改进的遗传算法，提出了一种考虑土壤对车辆行驶影响的改进遗传算法，该方法以路径行驶时间最短为优化目标，建立了适合野外环境的路径优化算法。含障碍物和含多种土壤的野外环境建模和路径优化结果表明：该优化算法建立了地面力学特性与车辆行驶的耦合作用，综合考虑了野外环境下的障碍物、土壤特征和车辆特性等因素，在复杂的野外环境下得到了车辆可以安全、高效和畅通通行的野外路径，为建立地形力学与路径优化算法的联系提供了参考

基于BlockDyna的裂隙岩体压水灌浆规律数值模拟研究

采用块体动力学分析系统(Block Dyna)中的渗流模块,对裂隙岩体中的压水灌浆规律进行了数值模拟。采用达西渗流模型描述压水过程,采用宾汉渗流模型描述灌浆过程,分别探讨了裂隙数量、裂隙开度对压水吕荣值及灌浆注入量的影响规律。计算结果表明,随着裂隙数量、裂隙开度的增大,吕荣值及浆液注入量均呈现逐渐增大的趋势。裂隙开度对压水吕荣值的影响是二次方关系,裂隙条数是一次方关系,裂隙开度对压水吕荣值的改变更为敏感。由于裂隙随机性及浆液进入截止开度等因素的影响,使得浆液最终注入量会出现局部反常现象

Study on a Cosmic-ray-produced Silicon-32 as a Tracer for Ocean Processes

32SI是一种宇生放射性核素,半衰期约150年。由于其来源单一、生产速率相对恒定,并具有与稳定硅相同的化学和生物特性,一直被视为研究50~1 000年尺度海洋过程的一个理想的计时钟和示踪剂。本文介绍了32SI在海洋学的应用,主要包括示踪近岸和大洋水体的混合,河口和大洋中硅的地球化学行为和循环,深海海底颗粒物的混合,及利用其计算沉积速率/混合速率,建立年代序列来反映环境变化的信息。The isotope silicon-32,with a half-life of approximately 150 years,is a cosmic-ray-produced radioactive nuclide in the atmosphere.Due to its single source and the relatively constant production rate,silicon-32 with its chemical and biological characteristics like the other stable silicon isotopes always has been seen as an ideal clock and tracer which has the potential to fill the dating time-gap and to understand marine from50 to 1 000 years geochemical-geophysical processes,e.g.the seawater mixing process in offshore and ocean,the geochemistry and cycle of silica in estuary and ocean,the particles mixing process in the deep sea bed,as well as the estimation of the sediment depo-sition rate and the establishment of the time-sequence to reflect the past marine environmental changes.国家海洋公益性行业科研专项项目(201105003

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel