黄河某水电站库区泥石流特征及工程影响研究

黄河某水电站库区泥石流沟道发育,对该水电站运行安全带来不利影响。结合国内外有关研究成果,根据库区内泥石流的具体特征,以杏儿沟、官亭沟和喇家沟为重点研究对象,分析研究了这几条沟泥石流的形成条件及运动特征,包括泥石流的流速、流量等,并将泥石流对工程的危害作出评价。研究成果对水电站建设具有重要指导意义。     

长江口深水航道研究

根据对水文泥沙条件及河床演变的分析，选择南港北槽开辟深水航道是合理的。定床和动床模型试验结果表明，用以整治为主、疏浚为辅的方法，取得－１２．５ｍ深水航道是可能的。长江口深水航道工程是对长江口进行综合治理、规划的重要组成部分，在总体上有益无害。     

对《影响半径稳定井流模型与可持续开采量：地下水动力学一个基本理论问题的分歧》一文的理解与体会

对Dupuit稳定流模型的实用性、影响半径等的质疑,与对Dupuit稳定流模型进行尽可能的合理“变脸”、进而用于生产实际中,看似矛盾,其实都在从不同的角度完善着地下水动力学体系。     

低扬程大流量泵站单机流量测量

对传统流量测量方法进行了综述，提出了采用内贴式超声波7510系列便携式流量计对低扬程大流量泵站单机流量进行测量是十分有效的。对内贴式超声波7510系列便携式流量计的测量原理、性能和安装方法进行了阐述，并结合南水北调东线江都第二抽水站进行了流量测量，对其测量结果进行了误差分析。     

改革开放以来中国现代舞的发展

本文对现代舞艺术的源头,发展,以及现代舞在中国的发展状况作了陈述,并对当下现代舞艺术发展之不足进行了反思,以及提出解决问题的方案。     

我国入境旅游者流动行为机理分析——对旅游热点城市西安的实证研究

旅游者流动机理是旅游地理学与旅游者行为学交叉研究的重要内容。推—拉理论是解释游客流动原因的一种有效方法。以西安入境旅游者为研究对象,从推—拉理论的视角,运用因子分析、单因素方差分析和皮尔逊相关分析等方法对来华入境游客的流动机理进行研究,得到的主要结论有:①明确了西安入境旅游者推力维度和拉力维度的各个因子;②检测了推拉维度的各因子受社会人口统计学变量的影响;③测度了推拉维度各因子之间的相互关联性及影响因素。研究成果对指导我国各主要旅游城市进行针对性的产品开发和市场营销具有一定的实践价值,同时在理论上也拓展了国内旅游流推力与拉力之间关系研究的范畴。     

Wall of cash: The investment-cash flow sensitivity when capital becomes abundant

In the mid 2000s the oil and gas industry was hit by what might be best described as a ‘wall of cash’ as oil prices successively reached new record levels and access to external financing improved greatly. In this article we investigate what this sudden abundance of liquidity implied for the investment-cash flow relationship, the interpretation of which continues to generate controversy in the literature. For financially constrained firms we find that the investment-cash flow sensitivity decreases in the abundance period (2005–2008), suggesting that the financing constraints became less binding in this period. For financially unconstrained firms the investment-cash flow sensitivity instead increases over time, suggesting that this relationship is driven by agency problems related to free cash flow. Our paper is the first in the investment-cash flow literature to bring evidence from a natural experiment in which there was an unexpected, exogenous, substantial, and persistent decrease in the cost of external financing.     

Flight to liquidity and the Great Recession

This paper argues that counter-cyclical liquidity hoarding by financial intermediaries may strongly amplify business cycles. It develops a dynamic stochastic general equilibrium model in which banks operate subject to agency problems and funding liquidity risk in their intermediation activity. Importantly, the amount of liquidity reserves held in the financial sector is determined endogenously: Balance sheet constraints force banks to trade off insurance against funding outflows with loan scale. A financial crisis, simulated as an abrupt decline in the collateral value of bank assets, triggers a flight to liquidity, which strongly amplifies the initial shock and induces credit crunch dynamics sharing key features with the Great Recession. The paper thus develops a new balance sheet channel of shock transmission that works through the composition of banks’ asset portfolios.     

Analysts' Cash Flow Forecasts,Audit Effort,and Audit Opinions on Internal Control

We examine the economic impact of analysts’ cash flow forecasts by looking at how external auditors respond to financial analysts’ issuance of cash flow forecasts. Using a differences‐in‐differences approach, we find that financial analysts’ initiation of cash flow forecasts leads to reduced auditor fees and audit report lags. Moreover, after cash flow forecast initiation, firms report fewer Section 404(b) internal control weakness disclosures. These findings suggest that cash flow forecasts constrain earnings manipulation and improve management accounting behavior, thereby reducing inherent and control risk and strengthening firms’ internal control over financial reporting.