谈桥梁裂缝在道桥工程中的影响

本人结合多年参与公路桥梁现场施工工作实践,对部分桥梁在建设过程中常见的一些裂缝类型进行归类总结,通过查找原因分析问题,才能让我们真正地了解各种裂缝的引发成因,进而制订防范措施,达到预防布控之目的。     

建筑空间限制条件下运用空心无梁楼盖设计实例分析

如今随着我国建筑技术的不断发展成熟,空心无量楼盖设计技术已经得到了比较广泛的应用,但是在施工过程中还存在一些问题需要注意。     

中国十大宜居城市房地产价格泡沫度的实证研究

本文通过单位根ADF检验,对我国十大宜居城市中的九个城市（剔除桂林,数据不可得）的房地产价格泡沫进行了初步检验,结果显示除青岛外其他城市房地产价格都面临着不同程度的泡沫。然后通过建立时变风险溢价模型和三变量VAR模型,对除青岛以外的剩余城市的房地产价格泡沫进行了度量,结果显示：上海、大连、北京、广州、成都、杭州、珠海和厦门的房地产市场都存在着不同程度的泡沫,其中北京、杭州和珠海的房地产市场泡沫已经达到了30％以上,而上海、大连和厦门的房地产市场泡沫在20％以上,成都和广州的房地产市场泡沫也在10％以上。使用该方法可以度量任何一个地区、省份、市区的房地产价格泡沫度,可以为房地产商、购房人和中央及地方政府提供相应的决策依据。     

美元、石油和金属价格——基于VAR模型的实证研究

近年来,美元贬值以及石油价格上涨一直被认为是造成有色金属价格上涨的两个可能的原因。在这一背景下,笔者采用VAR模型分析了美元价值和石油价格变化对我国铜、黄金、白银等金属价格的冲击影响,以及在此冲击下三种金属价格间的相互影响关系。结果表明:美元价值以及黄金和白银二者之间的相互影响关系在很大程度上决定了我国黄金和白银的价格行为;而美元、石油、黄金以及白银价格的变化对于我国铜金属价格的冲击尽管是显著的,但是四者均不是铜金属价格上涨的主要原因。     

人力资本培养与经济增长:来自中国的证据检验

利用1952～2009年时间序列数据,实证分析了中国人力资本培养与经济增长之间的关系。根据单位根检验、协整检验以及VAR模型估计等经验分析,结果发现,中国经济增长与人力资本培养各自的独立性较强,转变经济增长模式需要人力资本培养的密切配合。当期人均实际GDP增长率提高1%的话,下期人力资本增长率会降低2.26%,即人均实际GDP增长速度的波动对人力资本增量的变化有明显作用。政策上看,应早日建立市场主导式人力资本培养模式,增加人力资本培养主体的灵活性,从而更好地满足经济增长对要素投入的需求。     

Price connectedness between green bond and financial markets

We study price connectedness between the green bond and financial markets using a structural vector autoregressive (VAR) model that captures direct and indirect transmission of financial shocks across markets. Using heteroskedasticity to identify the structural VAR model parameters, our empirical findings reveal that the green bond market is closely linked to the fixed-income and currency markets, receiving sizeable price spillovers from those markets and transmitting negligible reverse effects. We also show that, in contrast, the green bond market is weakly tied to the stock, energy and high-yield corporate bond markets. These findings have implications in terms of portfolio and risk management decisions for environmentally aware investors holding positions in green bonds.     

Risk,uncertainty, and leverage

Using mostly theoretical models and traditional risk/uncertainty measures (VIX index, panic, precaution, scary bad news, etc.), the current literature tries to clarify the risk/uncertainty-deleveraging pattern. The findings are not sufficient to explain the dynamic empirical relationship between modern risk/uncertainty indicators and leverage. We fill this gap in the literature by using US quarterly data, from 1985:1 to 2018:4, Granger causality tests, and a structural vector autoregression model. We find that commercial bank leverage rises when geopolitical risk and macroeconomic, policy, and equity uncertainty increase. Client-based business relationships of banks and high government borrowing from banks during crises periods are responsible for this relationship. We find that the leverage of broker-dealers and shadow banks declines when Chicago risk and macroeconomic, policy, financial, and equity uncertainty increase. We argue that the vulnerability of broker-dealers and shadow banks to the risk/uncertainty of the entire market system is responsible for this relationship.     

Government intervention,sectoral productivity growth and structural transformation

This article examines the long-term impact of government intervention and sectoral productivity on structural transformation. We construct a multi-sector Dynamic General Equilibrium model that explicitly incorporates government intervention as a force of structural transformation. The government affects the economy through taxation and lump sum transfers. We show that in the steady state, a reduction in the tax rate and an increase in sectoral productivity will decrease the agricultural employment share, and when nonhomotheticity of preference is strong enough, these changes can also increase the share of services employment.     

Effects of the structural change on transaction costs between North America natural gas spot markets

Threshold cointegration between market pairs before and after the potential structural break associated with the shale gas revolution is examined. Pairwise transaction costs differ between the pre- and post-break periods. During the post-break period, five of seven pairwise transaction costs decrease, while the remaining two pair-wise transaction costs increase relative to the pre-break period. Alterations in natural gas flows as the result of the shale gas revolution partially explain the changes in transaction costs.     

LM cointegration tests allowing for an unknown number of breaks: implications for the forward rate unbiasedness hypothesis

This article extends the Lagrange multiplier (LM) cointegration test proposed by Westerlund and Edgerton (WE 2007) by allowing for an unknown number of breaks. Monte Carlo simulations provide two main results. First, a loss of power in the LM cointegration tests is detected when potential multiple breaks are ignored. Second, the modified testing procedures do not affect the asymptotic distribution and major properties of the tests of WE under the null, but noticeably increase their testing power in presence of multiple breaks. We also provide empirical applications of the proposed tests for the forward rate unbiasedness hypothesis (FRUH). The results reveal that the FRUH does hold when the effects of the multiple structural breaks are taken into account.