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Gives a momentum theory analysis to analyze the effects of the shroud on aerodynamic performance in a helicopter shrouded tail rotor system for hover and side wind states. As the key to the analysis, introduces a thrust distribution factor to represent the ratio of the shroud thrust to the total thrust of the shrouded rotor. With the help of the factor, fully derives the relations of the thrust, power and disk area for a shrouded rotor. Discusses the effects of the airflow velocity on the thrust gains of the shroud. Makes comparisons between a shrouded rotor and an isolated rotor for different cases and analyzes the variations of the thrust and power of a shrouded rotor with the thrust distribution factor. Gives several conclusions.

The article aims to investigate the effects of ownership and capital structure on postacquisition operating performance.

The article extends the ongoing literature from an operating loss perspective and provides empirical evidence on the probability of acquirers’ operating loss in relation to ownership and capital structure. The operating performance of publicly listed manufacturing firms in China was tracked up to five years since the completion of the mergers and acquisitions (M&A) during 2003–2014.

The empirical results show that, in a five-year postacquisition period, state-owned enterprises (SOEs) are more likely to experience operating loss than non-SOEs. The likelihood of the operating loss is negatively associated with ownership concentration, implying that concentrated ownership may serve as an effective corporate governance mechanism in the emerging economy and improve postacquisition performance. The rise in leverage increases the likelihood of postacquisition operating loss, indicating that the costs of debt may outweigh the benefits.

The findings contribute to the literature on ownership, debt governance and post-M&A performance from an emerging economy perspective.

The purpose of this paper is to find whether Chinese equity funds outperform the market and do Chinese fund managers possess positive market timing ability. This study also aims to investigate whether well-performing (worst) funds of last year continue to perform well (worst) in the following year.

Capital Asset Pricing Model and Carhart four-factor model are used for performance analysis, whereas for analyzing market timing ability, the Treynor and Mazuy (1966) and Henriksson and Merton (1981) models are applied. To investigate persistence in the performance of Chinese equity funds, all equity funds are divided, on the basis of performance in the past 12 months, into three equally weighted groups (high, middle and low) and then observed for next 12 months. After that, groups are again rebalanced according to their performance. This study uses a panel regression model for analysis.

Chinese equity funds are successful in providing higher than market returns, and fund managers possess positive market timing ability. The authors find that Chinese equity funds do not show persistence in performance as witnessed in developed markets. Well-performing funds (worst funds) of last year do not continue to provide higher (lower) return in the following year. Moreover, the authors detect positive relationship of fund size, age and expense ratio with the fund’s performance. Overall results suggest that emerging market equity funds show better performance than that of developed markets.

Investors are better off if they invest in equity funds instead of index funds, as results illustrate that equity funds outperformed the market. Further, the strategy of buying well-performing funds of last year and selling poorly performing funds of last year does not look very attractive in China. This study helps investors to understand the Chinese managed funds industry, and such an understanding is also helpful for fund managers and asset management companies who use performance information in marketing strategies.

This is the first study to investigate the performance persistence in Chinese equity funds and also contributes to the literature about the performance and market timing ability of equity funds. The study takes the sample of 520 equity funds for the period from 2004 to 2014, which includes a period of financial crisis of 2008.

The most recent and prestigious scientific research shows that nitrogen leaching caused by over-used nitrogen fertilizer rapidly acidifies all soil types in China, revolutionizing the basic understanding of the mechanism of soil acidification. The purpose of this paper is to study the impact of nitrogen on soil acidity over the long run, which is the shadow price of nitrogen.

In a discrete dynamic programming model, this paper compares the nitrogen application and soil pH between optimal nitrogen control that takes the shadow price of nitrogen into consideration and myopic nitrogen control that ignores that shadow price. Using a five-year panel experimental data on a rapeseed-rice rotation, this paper simulates and numerically solves the dynamic model.

Both theoretically and empirically, this paper shows that the over-use of nitrogen and the decline in soil pH are explained by ignorance of the shadow price of nitrogen. Compared with optimal nitrogen control, myopic nitrogen control applies more nitrogen in total, resulting in lower soil pH. In addition, over-use in the first season contributes to soil acidification and the carry-over effects mitigate that problem.

This paper enriches the literature by extending the study of the environmental impact of nitrogen leaching to its impact on the long-term loss in agricultural production, providing a new theoretical framework in which to study soil acidification rather than conventionally treating soil acidification as a secondary consequence of acid rain, and showing the possibility of using nitrogen control to mitigate soil acidification when lime applications are not feasible due to socio-economic constraints.