Wyniki wyszukiwania - Biblioteka Nauki

1

An on-line algorithm for the bounded p-batch scheduling with chain precedence constraints and unit processing time

100%

Nong Q. , Yuan J.

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tom Vol. 31, No. 3-4

277-290

EN

We consider the problem of scheduling unit time jobs with release dates on a single machine which can process up to b jobs simultaneously as a batch under on-line setting. There are chain precedence constraints on the jobs. The release dates and the precedence relations of the jobs remain unknown until their arrivals. The scheduling problem involves assigning all the jobs to batches and determining the starting times of the batches in such a way that the maximum completion time of the jobs (makespan) is minimized. In this paper we present an on-line algorithm with a worst-case ratio of radic3 for the problem.

2

Inhibitory Effect of Sodium Benzoate as Preservative Material in the Biogas Production in a Batch Anaerobic Digestion Process

88%

Sumantri I. , Buchori L. , Anggoro D. D.

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tom Vol. 21, nr 8

120--128

EN

Sodium benzoate has been used a food preservative worldwide. The effect of sodium benzoate as a preservative in the wastewater treatment was examined from the biogas formation viewpoint. The research was conducted in batch mode reactor systems employing various ratios of activated sludge and solution of sodium benzoate volume. The MLSS of activated sludge used was 12 g/L, while the volume ratios of activated sludge and sodium benzoate ranged from 0 to 100%. The concentrations of sodium benzoate used were 50, 100, and 200 mg/L. The biogas samples were measured every two days for 60 days. The results showed that the volume ratio of activated sludge and sodium benzoate of 60% and 40% was a turning point where the existence of sodium benzoate influenced the formation of biogas. There were significant reductions of biogas formation from 200.6 mL to 66.6 mL, 159.8 mL to 66.0 mL and 130.2 mL to 54.0 mL for the initial SB concentrations of 50, 100, and 200 mg/L. The kinetic parameters of the Modified Gompertz equation exhibited the greatest degree of confidence equal to 95%.

3

Simulation Modeling in Production Effectiveness Improvement – Case Study

75%

Burduk A. , Łapczyńska D. , Popiel P.

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tom Vol. 12, No. 2

75--85

EN

The paper deals with the problem of production material flow management. The proper way of logistic tasks management has an impact on the production process effectiveness and the cycle time, which is a very important factor in manufacturing. Reducing the production process cycle time results not only in the ability to provide more customers with orders but also in increasing the level of resources usage (machines, operators etc.). In order to reach the aim of improving production effectiveness, the simulation modeling was used. It is a computer method that supports a decision-making process and allows to perform experiments on production without interfering with the real process. The paper also includes a risk analysis performed to evaluate the imperfections of simulation modeling, based on the rules of fuzzy logic.

4

Doświadczenia w zakresie wytwarzania i zastosowania topionych kruszyw magnezjowych

63%

Skalska M. , Zelik W.

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tom T. 69, nr 3

238--242

PL

Kruszywa topione magnezjowe stanowią podstawę surowcową współczesnej technologii produkcji wyrobów magnezjowo-węglowych dla stref najwyższego zużycia urządzeń przemysłu stalowego. Zakłady Magnezytowe ,,ROPCZYCE” S.A. przy współudziale Wydziału Inżynierii Materiałowej i Ceramiki AGH w Krakowie w efekcie realizowanego wspólnie projektu POIG Działanie 1.4 „Zastosowanie kruszyw otrzymanych z krajowych surowców alternatywnych w materiałach ogniotrwałych”, opracowały technologię i uruchomiły linię technologiczną dla procesu topienia. W referacie przedstawiono doświadczenia z wdrażaniem technologii topienia komercyjnego koncentrując się na właściwościach otrzymywanych kruszyw topionych magnezjowych w zależności od zastosowanego wsadu. Równocześnie wskazano uzyskane efekty eksploatacyjne dla wyrobów magnezjowo-węglowych wyprodukowanych w oparciu o otrzymane kruszywa topione.

EN

Fused magnesia aggregates constitute the raw materials base of modern production technology of magnesia-carbon products for zones of the highest wear of steel industry installations. Zakłady Magnezytowe ,,ROPCZYCE” S.A. in partnership with the Faculty of Materials Engineering and Ceramics AGH-UST Kraków, as a result of a together realized project POIG Działanie 1.4 „Zastosowanie kruszyw otrzymanych z krajowych surowców alternatywnych w materiałach ogniotrwałych”, developed the technology and set working a technological line of fusion. The experience of implementation of commercial fusion technology is shown in the paper, concentrating on properties of the obtained magnesia fused aggregates depending on the charge used. Exploitation effects for magnesia-carbon products are also indicated, when the products have been manufactured by using the fused aggregates under consideration.

5

Simulation Modeling in Production Effectiveness Improvement – Case Study

63%

Burduk A. , Łapczynska D. , Popiel P. , Burduk A. , Łapczynska D. , Popiel P.

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nr 2