The purpose of this paper is to investigate the weak form of market efficiency, based on the concept of mean-variance analysis. The investigation initiates with an appraisal of the prediction of future closing prices from past closing prices from a sample comprising the stock of 79 enterprises with large capitalisation listed in Athens Stock Exchange (ASE) for the period of 01/01/2002 to 31/12/2006. The assessment continues with the filter rule test, where the buy or sell signal for going short acts as a detector of short-term movements outside the boundaries of specific risk, in order to appraise the short position in relation to the long position under the criterion of maximum profit generation.
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- Evaluating Athens Stock Exchange market efficiency: Is a ...
Test of precoat filtration technology for treatment of swimming pool water
The technical performance of a precoat filter was compared with that of a traditional sand filter. Particle concentration and size distribution were measured before and after the filtration of swimming pool water. Both the sand and precoat filters could reduce the particle concentration in the effluent. However, higher particle removal efficiency was generally observed for the precoat filter, especially for particles smaller than 10 μm in diameter. Adding flocculant improved the removal efficiency of the sand...
Application of leaching tests on phosphogypsum by infiltration-percolation
The phosphoric acid production obtained by attacking phosphate rock by sulphuric acid cogenerates considerable quantities of phosphogypsum. The world cogeneration is estimated about 100–280 Mt per year. In another context of sustainable development, the phosphate chemical industry develops different ways of phosphogypsum valorization, which makes its storage stack in a suitable way for its potential use as an industrial by-product. Although, this storage can cause an environmental impact largely due to the...
Filter bed remediation - Case Study
Biological filter beds usually consist of a mineral media over which effluent to be treated percolates. The media becomes host to a biomass which is grazed by a series of more complex organisms. If the growth of the biomass is greater than the rate at which the grazing occurs then the biomass film will accumulate in the bed. This will block the interstices of the media and restrict effluent drainage and ventilation of the bed. Under these conditions nitrification is usually the first thing to suffer, however...
Simplifying the Screening Workflow for Extractables Testing: Infographic
The safety of pharmaceuticals, cosmetics, and foodstuffs may be compromised by chemical compounds in the various types of packaging and food contact materials (FCMs) that are in direct contact with the consumer product. Due to continuously increasing global regulations, the characterization of extractables and leachables from packaging and FCMs has become more critical than ever for the manufacturers that supply the pharmaceutical, food, and cosmetics industries. These chemical compounds are typically categorized...
Guide To Coolant In Oil Test Methods
Liquid cooled engines and rotating equipment use glycol based coolants because of their excellent heat transfer abilities. However, glycol based coolants are not desirable at all in lubrication oil itself – Coolant ingression to the lubricant is a particularly nasty contaminant for the variety of damage it can cause. Glycol coolants break down in the high temperature engine environment, leading to formation of glycolic acids. These acids attack nonferrous bearing surfaces and form metal salts. The acids...