Emerging risk of autoignition and fire in underground coal storage

The risk and prevention of autoignition in underground coal storage facilities are reviewed in the light of the recent incidents of smouldering fires. Also, the opportunities are considered on the efficiency of the alternatives to prevent and extinguish closed-space fires. The complexities in avoiding and extinguishing underground fires are highlighted in the case example, describing the observations and outcome of a smouldering coal fire in the storage. The principles of self-heating and most critical factors in spontaneous combustion such as the condition and quality of coal are fairly well known, but usually only provide partial help in fire prevention. The documented cases and the case example suggest that nitrogen injection can be useful for extinguishing controllable fires. Three-phase foams and oxygen-displacing exhaust gases appear preferable against uncontrolled fires, particularly if access to the fire area is limited or impossible. Otherwise, efficient fire extinction during power plant operation can be challenging, as any air ingress tends to feed the fire and results in losses of the extinguishing agent and the heating value of coal. Methods and indicators for detecting and predicting the ignition are discussed, and improvements are suggested to enhance the storage and plant availability.     

Experience and the unexpected: risk and mitigation issues for operating underground storage silos for coal-fired power plant

Observed autoignition events and extinguishing the resulting smouldering fires in an underground storage system of a coal-fired power plant have provided insight into the array of contributing variables, and some experience on quantifying the risk with alternative scenarios of event initiation, progress and potential mitigation. Although the first attempts to quantify the risk suggest high sensitivity to the sequence of action taken after fire alarm, and no similar storage sites really exist, some recommended preventive, corrective and other mitigating activities can be at least partly defined and improved by using the cumulative experience and parallel efforts in other closed or underground storage sites. However, there are also so-called black (or at least grey) swans: unexpected events for which the facility may be poorly prepared for. In the case of the underground storage silos, such an event was experienced when incoming cold coal during a harsh winter season froze the sewer system that normally protects the stored coal from seepage water. With blocked normal bypass, the seepage water found its way to the coal silos and created large clumps of icy coal that blocked the coal conveyors. Although freezing weather is not unusual at high-latitude power plants, the common methods to combat freezing of coal are mainly useful for open storage sites and above-ground transport. Options for mitigation are discussed, as well as the event chain leading to an event that had never previously occurred. The case is discussed from the point of view of options to prepare for rare or unforeseen events.     

E-satisfaction: a re-examination

E-satisfaction as a construct has gained increasing importance in the marketing literature in recent times. The examination of consumer satisfaction in an online context follows the growing consensus that in Internet retailing, as in traditional retailing, consumer satisfaction is not only a critical performance outcome, but also a primary predictor of customer loyalty and thus, the Internet retailer's endurance and success. The current study replicates the initial examination of e-satisfaction within the U.S. by [Szymanski, David M., & Richard T. Hise (2000). E-satisfaction: An initial examination. Journal of Retailing, 76(3), 309-322] among a sample of online consumers drawn from Germany. The replication was extended to two contexts—consumer satisfaction with Internet retail shopping and consumer satisfaction with Internet financial services sites. The results yield rich insights into the validity of extending the measurement and predictors of e-satisfaction to a trans-national context.     

Illusory Price Increases after the Euro Changeover in Germany: An Expectancy-Consistent Bias

The aim of the present report is to review research demonstrating the role played by expectations for observed illusory price increases after the euro introduction in Germany. In laboratory experiments when participants are asked to estimate price changes in a restaurant following the euro introduction, the price estimates are found to be biased in the direction of the expectation of rising prices. The research also examines the extent to which a similar judgment bias is evident in other areas and how interventions counteract the bias. A further focus of the research is on the underlying process. In this respect the results show that the bias is based on a selective outcome correction process not previously described. Theoretical implications and practical implications for consumer policy issues are highlighted.

Overbidding in fixed rate tenders—an empirical assessment of alternative explanations

This paper investigates various theories explaining banks’ overbidding in the fixed rate tenders of the European Central Bank (ECB). Using auction data from both the Bundesbank and the ECB, we show that none of the theories can on its own explain the observed overbidding. This implies that the proposed new rules by the ECB, aimed at neutralizing interest rate expectations, would not eliminate overbidding if the rationing rule in the fixed rate tenders remains unchanged.