Wyniki wyszukiwania - BazTech

1

Prioritisation and Analysis of Faults in Shirt Production by the A3 Technique

Küçük Mehmet

Fibres & Textiles in Eastern Europe

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2022

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Vol. 30, no. 2

35--46

EN

In this study, it was aimed to solve the problems occurring in a clothing company’s shirt manufacturing line. For this Pareto charts and A3 reporting philosophy were used to organise the process in the best way. In line with the examinations and analyses made, an apparatus was developed to shorten the unit time and standardise the quality for the collar preparation process, which is the fault with the highest frequency. Afterward, the collar preparation process was compared according to the situation with the apparatus, manual and automat. As a result of the implementation of the Pareto charts and A3 reporting technique, it can be seen that while the total time spent on the process with the automat is 24.6 seconds, this time is 87% quicker than the apparatus developed, which is 46.2 seconds; however, it needs 95% more investment.

2

Infuence of collars on reduction in scour depth at two piers in a tandem confguration

Memar Sargol, Zounemat-Kermani Mohammad, Beheshti Aliasghar, Rahimpour Majid, De Cesare Giovanni, Schleiss Anton J.

Acta Geophysica

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2020

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Vol. 68, no. 1

229--242

EN

Bridge failure, due to local scour at bridge pier foundations, has become a critical issue in river and bridge engineering, which might lead to transportation disruption, loss of lives and economic problems. A practical solution to prevent bridge collapses is the implementation of scour mitigation methods around bridge foundations. Based on an experimental perspective, this study is focused on the infuence of the size and position of circular collars from the sediment bed on scour depth at two tandem piers. To meet this end, long-lasting experiments are performed under clear-water conditions using uniform sand for bed materials. Compared to the adjacent position of the collar on the bed, placing the collars below the bed would increase the delay time of scour at the piers up to four times. However, regardless of the delay time, the observations indicate that locating the collars on the initial bed surface results in maximum reduction in scour depths around the piers. It was found that diminishing the fow intensity has a dramatic impact on the scour reduction at the piers, so that maximum reduction in scour depths at piers increased on average from 20 to 70% with the reduction in the fow intensity from 0.95 to 0.9.

3

Bridge pier scour mitigation under steady and unsteady flow conditions

Tafarojnoruz A., Gaudio R., Calomino F.

Acta Geophysica

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2012

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Vol. 60, no. 4

1076-1097

EN

Watercourse morphology is affected by local scouring when the flow interferes with anthropic structures. Controlling the scour hole size is of predominant importance to guarantee bridge safety as well as to limit the variations of river morphology. A combined countermeasure against bridge pier scour is proposed and tested in order to reduce the maximum scour depth and deviate it away from the bridge foundation. In the first part of the laboratory campaign, combination of two countermeasures (bed-sill and collar) was evaluated for a circular pier under clear-water and live-bed steady flow conditions. The proposed combined countermeasure exhibited an efficiency of about 64% in terms of scour depth reduction. Afterwards, it was tested in unsteady flow conditions, first for a circular pier, then in the case of a rectangular pier with round nose and tail, two circular in-line piers and two rectangular in-line piers, under a hydrograph with a peak flow velocity slightly above the threshold condition of sediment motion. Results showed that the combined countermeasure had an efficiency of about 63% for a single circular pier; however, higher efficiency (about 75%) was obtained in applications to rectangular pier and two in-line circular or rectangular piers.

4

Spectrophotometric and chromatographic-densitomeytric determination of propoxur in the collars for animals

Krzek J., Stolarczyk M., Maślanka A.

Chemia Analityczna

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1999

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Vol. 44, No. 1

55-60

EN

A spectrophotometric and chromatography-densitometric method has been developed for determination of propoxur (2-isopropoxyphenyl methylcarbamate) in the coIlars for animals. Conditions for the propoxur extraction into various solvents have been deter-mined, and the superiority of methanol and carbon tertrachloride for propoxur determi-nation has been stated. Analysis of real samples proved that these two developed methods can be used for qualitative and a quantitive determination of propoxur in the coIlars for animals, because consistent results were obtained for each of them.

PL

Opracowano spektrofotometryczną oraz chromatograficzno-densytometryczną metodę oznaczania propoksuru (2-isopropoxyphenyl methylcarbamate) w obrożach dla zwierząt. Ustalono warunki ekstrakcji propoksuru do różnych rozpuszczalników stwierdza- jąc, że metanol oraz czterochlorek węgla są najbardziej przydatne do oznaczeń. Wyniki analiz próbek rzeczywistych pozwalają stwierdzić, że opracowane metody mogą być wykorzystane do analitycznej oceny zawartości i tożsamości propoksuru w obrożach dla zwierząt, bowiem w obu przypadkach uzyskano zgodność wyników.