Fruit waste extract was selected as the sole substrate for carotenoid production and the effect of parameters like pH, temperature and agitation have been studied. A two-step simple sequential strategy was employed for the optimization of carotenoid production by Rhodotorula rubra. In the first step, one factor at a time was employed to evaluate the impact of pH on carotenoid production. Th...

monascus purpureus is a fungus that had been cultured on the rice in eastern asian countries since thousands years ago and used as a food for long years. the fungus produces very valuable metabolites with polyketide structure. the most important metabolite is monacolin k, lovastatin or competitive inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme a reductase (an affective enzyme in cholesterol s...

the optimum fermentation times of black tea manufactured by two systems of orthodox and ctc (cut, tear & curl) were investigated by measuring the quality parameters of black tea, like: theaflavin, thearubigin, highly  polymerized substances and total liquid colour during the fermentation stage. optimum fermentation times from the beginning of fermentation were determined to be 60 min and 15...

in this paper a single server queuing production system is considered which is subject to gradual deterioration. the system is discussed under two different deteriorating conditions. a planning horizon is considered and server which is a d/m/1 queuing system is gradually deteriorates through time periods. a maintenance policy is taken into account whereby the server is restored to its initial c...

There are many factors which affect the performance of a complex production system. Efficiency of an assembly line is one of the most important of these factors since assembly lines are generally constructed as the last stage of an entire production system. Parallel two-sided assembly line system is a new research domain in academia though these lines have been utilised to produce large sized p...

Significant number of producers and manufacturers are realizing substantial financial environmental benefits from sustainable/ greener business practices. Sustainable production manufacturing the creation manufactured products through economically-sound processes that minimize negative impacts while conserving energy natural resources. also enhances employee, community, product safety. The aim ...

In this study, the optimal factor value estimates of the effect of Zirconium Oxychloride (ZrOCl2) with different concentrations of citric and formic acids on the flame-retardant properties of wool which is assessed by thermal analysis, mass loss, the limiting oxygen index and vertical flame is considered and compared by two different optimization approaches, namely, with and without Robust Para...

The modeling and solution approaches being used to automate construction of course timetables at a large university are discussed. A course structure model is presented that allows this complex real-world problem to be described using a classical formulation. The problem is then tackled utilizing a course timetabling solver model that transforms it into a constraint satisfaction and optimizatio...

This research deals with line balancing under uncertainty and presents two robust optimization models. Interval uncertainty for operation times was assumed. The methods proposed generate line designs that are protected against this type of disruptions. A decomposition based algorithm was developed and combined with enhancement strategies to solve optimally large scale instances. The efficiency ...