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Beer Game developed by Slaon School of Management didn¡¦t add price variable into the game. It¡¦s reasons were : (1) As long as there is time delay, it will induce dynamic complexity. (2) If there is price variable, maybe we can¡¦t observe patterns and structure. In the research, we try to add price variable into Beer Game to verify the statement made by Slaon School of Management. Besides, we can explore whether it will influence players¡¦ decisions or not. The learning effects are also we concern about. After a few experiment, althought bullwhip effect is still existing, it¡¦s not much apparent then before. Besides, players are affected by price variables. From discussions after the game, we can find players lack systems thinking, they have misperceptions of feedback and get used to put blame on others. Those learning effects are the same as traditional beer game induced. However, beer game with price variable can conclude many behaviors made by players. To contrast with the panic buying and stock conditions, such as respirators panic buying in 2003, toilet paper price rise caused by pulp cost increased in 2004, players can simulate the real world throuth playing the game. They can reflect and learn, then bring this experience into real life.

Thesis (doctoral)--Helsinki University of Technology, 2001. / Includes bibliographical references. Also available on the World Wide Web.

Thesis (doctoral)--University of Helsinki, 2000. / Includes bibliographical references. Also available on the World Wide Web.

No description available.

No description available.

<p>&quot / Traditionally brewed beers are of cultural and economic importance to many African nations. The presence of mycotoxins in African beer is a topic that needs to be addressed, since most African countries have a climate of high humidity and temperature that favours the growth of moulds. Mycotoxins challenge not only the health of animals and humans, but also the economy, especially in underdeveloped countries where contamination is most likely. Literature proves that mycotoxins depict various effects on the immune system including immunotoxicity. Beer analysis is therefore of utmost importance in order to evaluate organoleptic characteristics, quality, nutritional value as well as safety. The aims of this study involve the analysis and comparison of traditional and commercial beer in terms of physical characteristics, mycotoxin concentrations as well as effects on specific immune pathway biomarkers in order to elucidate possible immunotoxicity...&quot / </p>

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Title page, summary and table of contents only. The complete thesis in print form is available from the University of Adelaide Library. / Diatomaceous earth (DE) is widely used in the filtration of beer to remove suspended yeast and other particulate material that can cause cloudiness or haze in the final product. The DE used has a particle size diameter of between 60 and 100 um. However, health and safety concerns arise its human carcinogenic classification in 1997 from Category 2 (Probable Human Carcinogen) to Category 1 (Human Carcinogen) by the IARC. In a confidential study conducted at Adelaide University, zeolite-A, a hydrated aluminosilicate of alkali earth metals, showed promising filtration capabilities when used in the removal of haze in white wine. Zeolite-A is non-toxic via oral, dermal, ocular and respiratory exposure as well as safe for the environment at disposal. An experimental study to investigate zeolite-A as a possible substitute for DE in the brewing industry was therefore undertaken. The particular zeolite-A used was selected as it was judged as nearly the same as that manufactured within the Department of Chemical Engineering, Adelaide University from naturally occurring deposits of kaolin. Two size-grades of zeolite-A (large diameter particles of 125-250 um and small diameter particles of 63-125 um) were selected to cover the particle size range of widely used DE (as Celite 503). These two zeolites, together with filter sand (200 um diameter particle size) and silica were experimentally evaluated against DE in the clarification of beer simulants and commercial beer product. Flux-time experiments on each of three packed beds of each of the five filter media (3.63, 11.23, 18.83 g) with three values of pressure driving force (70, 125, 180 kPa) were carried out in a specially constructed pilot plant, initially in the laboratory and later in situ in a commercial brewing plant. This special pilot plant, together with protocols for the preparation of media, simulated conditions and practices in current use in the brewing industry. The flux obtained from the small grade zeolite-A (particle 63-125 um) was significantly lower compared to DE, i.e. respectively, 22 mLm⁻²s⁻¹ and 390 mLm⁻²s⁻¹ (using 18.83 g media at 180 kPa) Large grade zeolite-A (particle size 125-250 um) showed comparable flux properties to DE with flux rate of 290 mLm⁻²s⁻¹ . Microbiological analyses were carried out initially on eight selected filter media - which also additionally included pumice, perlite and cellulose (as cotton wool) - to assess effectiveness in removing haze forming constituents from a simulated beer (yeast solution) and two home-brewed beer types. The pumice, perlite and cellulose were rejected as alternative filter media because of poor performance in haze removal. Microbiological, chemical and sensory analyses were carried out on each of the five remaining media. Results of the microbial analyses highlighted that DE and zeolite-A were the best filter media because practically all yeast cells were retained on the filter cake from both the simulated beer and the home-brewed beers. With filtration of commercial beers using small grade zeolite-A as the filter medium in situ at Cooper's Brewery an increase in pH value of the filtrate of 2.0 pH units was observed. For large grade zeolite-A the pH increase of the filtrate was less than 0.5 pH units. This increased pH of the filtrate with both grades of zeolite-A was demonstrated to be due to the release of sodium ions from the filter medium. Additional experiments were conducted to exhaust the sodium from the filter media of both the small and large grade zeolite-A. The pH of the filtrates was monitored for between 8 and 16 h of continuous filtration to determine if all sodium could be exhausted from the medium. A practical constraint was that the filter cake became clogged with yeast and other solid particles from the beer haze before a noticeable change in pH of the filtrate could be observed. Sensory analyses of filtrates of each of the five selected media were carried out by 16 industry noses to assess: colour, aroma, taste, clarity and drinkability ( = overall impression). Overall the large grade zeolite-A filtrates compared satisfactorily with the DE filtrates in ratings of differences from the Descriptive Method employed in the brewery industry for colour, taste, aroma, clarity and drinkability. Small grade zeolite-A filtrates however compared poorly where the filtrate was regarded as inferior to DE, filter sand and silica, by all the members of the panel of noses. Small grade zeolite-A was further found to have a significant adverse effect on the filtrate taste using the Triangular Method widely employed commercially for establishing taste. Therefore small grade zeolite-A was deemed an unsuitable filter substitute for DE in the clarification and removal of haze constitutes in commercial beer. Large grade zeolite-A however appears to be a suitable substitute filter medium for DE in the removal of haze constituents in beer. Importantly it can be readily substituted for DE without the need for significant changes in brewery industry process equipment and protocols for preparation. The findings from this study are sufficient to strongly recommend a focused study on contributing chemical and mechanical factors to the (small) pH increase of the filtrate using large grade zeolite-A. It is not known whether a range of zeolites might also provide a practical substitute to DE, present understanding must therefore be said to be limited. Other zeolites proposed for the removal of haze from beer would need to be evaluated experimentally. The pilot plant and procedures developed for this study would be readily applicable for such an undertaking. An important justification for future work is that a suitable substitute for DE such as zeolite-A is seen as timely in view of the significant health risks associated with the established carcinogenic properties of DE. There is no evidence available to show that zeolites have been studied as an alternative to DE for the removal of haze (in beer or wine). Therefore the findings reported in the present study for zeolite-A, together with earlier findings from the polishing of white wine, strongly indicate the basis for development of IP patent(s). / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=707221 / Thesis (M.App.Sc.) -- University of Adelaide, Dept. of Chemical Engineering, 2001