Search results

We present the finite element simulations of reactive mineral‐carrying fluids mixing and mineralization in pore‐fluid saturated hydrothermal/sedimentary basins. In particular we explore the mixing of reactive sulfide and sulfate fluids and the relevant patterns of mineralization for lead, zinc and iron minerals in the regime of temperature‐gradient‐driven convective flow. Since the mineralization and ore body formation may last quite a long period of time in a hydrothermal basin, it is commonly assumed that, in the geochemistry, the solutions of minerals are in an equilibrium state or near an equilibrium state. Therefore, the mineralization rate of a particular kind of mineral can be expressed as the product of the pore‐fluid velocity and the equilibrium concentration of this particular kind of mineral. Using the present mineralization rate of a mineral, the potential of the modern mineralization theory is illustrated by means of finite element studies related to reactive mineral‐carrying fluids mixing problems in materially homogeneous and inhomogeneous porous rock basins.

We use the finite element method to model the heat transfer phenomenon through permeable cracks in hydrothermal systems with upward throughflow. Since the finite element method is an approximate numerical method, the method must be validated before it is used to solve any new kind of problem. However, the analytical solution, which can be used to validate the finite element method and other numerical methods, is rather limited in the literature, especially for the problem considered here. Keeping this in mind, we have derived analytical solutions for the temperature distribution along the vertical axis of a crack in a fluid‐saturated porous layer. After the finite element method is validated by comparing the numerical solution with the analytical solution for the same benchmark problem, it is used to investigate the pore‐fluid flow and heat transfer in layered hydrothermal systems with vertical permeable cracks. The related analytical and numerical results have demonstrated that vertical cracks are effective and efficient members to transfer heat energy from the bottom section to the top section in hydrothermal systems with upward throughflow.

The purpose of this paper is to empirically analyze the impacts of motivation for avoiding loss and actual abnormal audit fees on management behaviors of audit opinion shopping.

Using empirical research methods, this study employs regressive models and moderating effect models with data from Chinese listed companies from 2001 to 2008.

By analyzing the empirical data, it is found that strong motivation for avoiding loss has a certain moderating effect on the relationship between abnormal audit fees and audit opinion shopping; abnormal descent of audit fees significantly increases both the likelihood of receiving modified audit opinions of annual financial reports and that of the improvement of audit opinions; listed companies reporting consecutive losses in the last two years have a higher likelihood of an improvement in unfavorable audit opinions because of stronger motivation for avoiding loss and audit opinion shopping of management; and strong motivation for avoiding loss has a significant moderating effect on the relationship between abnormal increase of audit fees and audit opinion shopping.

This study has a significant practical implication for market supervisors, small and medium investors.

The paper classifies abnormal audit fees into abnormal increase and descent of audit fees, and audit opinions differences into the improvement and deterioration of audit opinions, and further empirically analyzes and verifies the moderating effect of motivation for avoiding loss on the relationship between abnormal audit fees and audit opinion shopping.

Overconfidence as an important psychological factor can also affect CEO’s cognitive preferences, while there are few studies about the impact of CEO’ overconfidence on the international expansion of companies. This paper aims to fill this gap and further discuss the moderating role of CEO’s overseas experience, CEO duality and ownership.

The authors focus on the Chinese context, collect 2008–2016 data from China's manufacturing industry as sample, use fixed effect model to analyse the effect of CEO overconfidence on international expansion strategy of Chinese firms.

The empirical results show that: CEO overconfidence positively promotes the degree of firm internationalization. CEO foreign experience positively affects the internationalization degree, but can restrain overconfidence thus negatively regulate this impact relationship. When duality is present, both CEO power and managerial discretion are pronounced and they exhibit a stronger effect. Firm’s equity nature will affect the relationship between CEOs' overconfidence and the degree of internationalization. Compared with private enterprises, CEOs in state-owned enterprises have limited power, therefore, this influence relationship is weaker.

This study has emphasized the importance of top executives' psychological characteristics on firm internationalization, which is key application and complement of upper echelons theory and fills the research gap in the literature. In this paper, the authors found the advantages of overconfidence for firms, which helps to understand the complex meaning of overconfidence. The results of moderating effect further explore the application of overconfidence in different context, which has some implications for management practice.

The purpose of this paper is to empirically investigate the volatility spillover between the Chinese stock market, investor’s sentiment and oil market, specifically during the 2014‒2016 turmoil period.

This study used the daily and monthly China market price index, oil-price index and composite index of Chinese investor’s sentiment. The authors first use the DCC GARCH model in order to study the correlation between variables. Second, the authors use a continuous wavelet decomposition technique so as to capture both time- and frequency-varying features of co-movement variables. Finally, the authors examine the spillover effects by estimating the BEKK GARCH model.

The wavelet coherency results indicate a substantial co-movement between oil and Chinese stock markets in the periods of high volatility. BEKK GARCH model outcomes confirm this relation and report the noteworthy bidirectional transmission of volatility between oil market shocks and the Chinese investor’s sentiment, chiefly in the crisis period. These results support the behavioral theory of contagion and highlight that the Chinese investor’s sentiment is a channel through which shocks are transmitted between the oil and Chinese equity markets. Thus, these results are important for Chinese authorities that should monitor the investor’s sentiment to better control the interaction between financial and real markets.

This study makes three major contributions to the existing literature. First, it pays attention to the recent 2015 Chinese stock market bumble. Second, it has gone some way toward enhancing our understanding of the volatility spillover between the investor’s sentiment, investor’s sentiment variation, oil prices and stock market returns (variables of interest) during oil and stock market crises. Third, it uses the continuous wavelet decomposition technique since it reveals the linkage between variables of interest at different time horizons.