热塑性塑料复合管在普光气田的应用

针对普光气田大湾区块天然气开采过程中产生的高含硫化物、氯化物与矿质污水的强腐蚀、易结垢问题,以及污水处理站到污水回注井管输管线压力高,线路段地形条件复杂等因素,采用热塑性塑料复合管替代原有的玻璃钢管,降低了管线运行费用,安全性更高,大大减少了因污水管线泄漏带来的环境污染和安全问题。     

Earnings management as a predictor of future profitability of Finnish firms

This study investigates whether the level of current earnings management can be used to predict future profitability of Finnish firms. Earnings management is assumed to predict future profitability, because firms use discretional accruals to manage this year's earnings upwards/downwards, if they believe that the next year's earnings will be high/low. Finnish data are used because the extent of the earnings management can be directly measured from the published Finnish financial statements. The results indicate that the lagged earnings management is significantly related to the future profitability of a firm. The lagged earnings management also contains incremental information relative to past profitability or stock prices when predicting future profitability.     

Does file-sharing reduce DVD sales?

The short-term effect of BitTorrent file-sharing on movie DVD sales is estimated using sales data on newly released DVDs and torrent file downloads during a 13-week period between March and May 2009 in the USA. To overcome endogeneity between downloads and sales, the analysis is carried out in a dynamic panel setting. After controlling for an autoregressive component and a declining time trend in sales, the file-sharing elasticity of sales is not statistically different from zero in the difference GMM estimations. The results hold when external instruments are used. Moreover, the results suggest an upper bound of ?0.21 of elasticity, indicating that the short-term sales displacement effect is moderate at worst.     

Costs of administration,travelling, and productivity losses associated with hospital administration of multiple myeloma drugs in Finland

Aim: To estimate the drug administration, travelling, and productivity costs associated with infusion or subcutaneous proteasome inhibitor (PI) treatments (specifically carfilzomib and bortezomib) for multiple myeloma (MM) patients in Finland.

Materials and methods: Price tariffs of Finnish hospital districts are used as the basis of invoicing sent to healthcare service payers. A review of these price tariff lists was conducted and obtained data analysed to estimate the mean unit cost of PI administration visit. Travelling costs stratified by areas with different population densities were assessed, based on the national travelling reimbursement register data maintained by the Social Insurance Institution of Finland. Productivity costs due to time spent on administration visits and travelling were estimated based on an expert interview and a spatial healthcare accessibility analysis.

Results: Nineteen (95%) of the Finnish hospital districts were included in the review. Relevant unit cost information was found for 15 (75%) of the districts. The mean PI administration cost alone was 270€ (95% CI?=?189€–351€) per administration and increased to 371€ when travelling costs were included. Productivity costs added, the mean PI administration costs totalled 405€ for bortezomib and 437€ for carfilzomib.

Limitations: The costing rationale of price tariffs may vary between hospital districts. Productivity costs were estimated conservatively, due to lack of data.

Conclusions: The administration of intravenous or subcutaneous PIs to treat MM in healthcare facilities causes significant and potentially avoidable healthcare, travelling, and indirect costs, and they should be included in all health economic evaluations (HEEs). As the cost estimates utilized in this study represent most of central hospitals in the country, they provide useful information for future HEEs. A broader conclusion is that novel oral medications, such as the first oral PI, have a significant potential for reducing administration-related costs of subcutaneous or intravenous PIs.     

物流配送成本优化估计的数学模型研究

为了有效地利用物流成本估计中线性和非线性数学模型的优点,把线性预测性能优异的ARIMA数学模型和RBF神经网络相结合,使模型非线性数学变化上形成估计优化,可以捕捉物流成本价格的线性和非线性规律,有效地减少传统预测数学模型中一些非线性因素的影响。以某物流公司1991～2012年物流操作成本为数据,将所提出的数学模型与网格搜索SVR模型、PSO-SVR模型、Levenberg-Marquardt BP神经网络模型及背景值优化GM(1,1)模型进行对比实验。结果表明所提出的优化数学模型能够解决上述问题且具有更高的预测精度。     

Does corporate environmental protection increase or decrease shareholder value? The case of environmental investments

This study examines share price effects of environmental investments using data from the Finnish forest industry from 1970 to 1996. The results indicate that the instantaneous market reaction is negative, and that the larger the investment, the larger the fall in prices. However, contrary to the view that corporate actions have a permanent effect on firm value, we observe rapid price recovery after the instantaneous negative reaction. This may support a hypothesis that environmental investments create goodwill for the investing firms and are thus not negative net present value investments. Unexpectedly, we find that the instantaneous negative market reaction was stronger in the most recent sample years. Explanations for this finding relate to the slowness of institutional change within the financial community as well as to the growing share of international investors seeking short‐term holding gains. In conclusion, it appears that not only finance theory but also notions from institutional theory and corporate environmental management literature are needed to explain stock price behaviour in conjunction with environmental investments. Copyright © 2001 John Wiley & Sons, Ltd and ERP Environment     

The effect of foreign ownership restrictions on stock price dynamics

The Effect of Foreign Ownership Restrictions on Stock Price Dynamics. —This paper uses Finnish data to explore the impact of foreign ownership restrictions on the dynamic properties of domestic stock prices. These restrictions create unrestricted stocks (foreign and domestic ownership) and restricted stocks (domestic ownership). Unrestricted share prices are significantly more volatile than those of restricted shares but their means are not significantly different from each other. The returns on the two types of shares are found to be generated by an error correction model. These results support the hypothesis that the unrestricted share prices tend to overshoot relative to equilibrium with the arrival of new information.     

Expected Returns and Idiosyncratic Risk: Industry-Level Evidence from Russia

We explore a relation between expected returns and idiosyncratic risk in Russia. Investors in the Russian stock market cannot fully diversify their portfolios due to transaction costs, information gathering and processing costs, and shortcomings in investor protection. This implies that investors demand a premium for idiosyncratic risk. We estimate the price of idiosyncratic risk using MIDAS regressions and a cross section of Russian industry portfolios. We find that idiosyncratic risk is economically significant and commands a negative (positive) premium, on average, of 10.0% (8.0) per year before (after) the global financial crisis in 2008. The results remain unaffected after controlling for global pricing factors and return reversal.     

Consuming nostalgia? The appreciation of authenticity in local food production

Many consumers consider local food a more sustainable choice than conventional food because of the shorter transport distances involved as well as the support provided to local economies. In addition, consumers value the perceived safety benefits, ethical associations and improved taste of local food. In this study, we focus on the cultural meanings of locally produced food among Finnish consumers. Based on interviews with 22 consumers, our analysis suggests that, besides consumers valuing sustainable, healthy and tasty locally produced food, they perceived self‐produced, self‐processed items, including those they have gathered, hunted and fished themselves, as the most authentic local food. Furthermore, local food is associated with craftsmanship and artisan production. We also found that interviewees tended to historicize their relationship to food through local production. Thus, consumers seem to be in search of ‘real’ or ‘true’ food that is embedded in their personal and shared social histories.