Browsing by Subject "Effect"
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Item Open Access The effects of different musical elements on root growth and mitosis in onion (Allium cepa) root apical meristem (musical and biological experimental study)(2007) Ekici, N.; Dane F.; Mamedova L.; Metin I.; Huseyinov, M.In this study effects of strong, complex, rhythmic accent classical music with sekunda and kvarta intervals and frequently reprized and opus with rhythmic dynamically changing lyrics which contain more extensive kvinta septa oktava intervals on mitotic index and root growth were investigated in onion (Allium cepa) root tip cells during germination. For this aim, music samples from Wagner, Mozart, Musorgsky, (Boris Godunov) Chopin, Tchaikovski, Schubert were chosen. We found correlation between root elongation and Mitotic Index (MI). Both kinds of music have positive effects on root growth and mitotic divisions in onion root tip cells but rhythmic dynamically changing lyrics affected much better. In this study light microscopy techniques were used but ultrastructure of root tip cells will be studied with electron microscope in the following study. © 2007 Asian Network for Scientific Information.Item Open Access Processing and environmental effects on composite repairs(2012) Elaldı, Faruk; Elaldı, PelinThe scarf-joint technique is one of the latest techniques used for repairing composite aircraft structures. But this technique is mostly used at depot level repairing activities since it requires autoclave and other equipments. This article focuses on scarf joint comprised of vacuum and autoclave precured and co-cured composite patches bonded to autoclave and vacuum precured parent laminates. Autoclave and vacuum cured parent laminates and scarf joints were prepared and exposed to the same temperature and moisture environment for comparison. All specimens were loaded in tension at three temperatures. Interlaminar shear strength (ILSS) tests were also carried out for the parent materials. As noted, the tensile strength and ILSS decrease when the material has been exposed to moisture and tested at elevated temperature. But, no significant difference was reported for either tensile strength or ILSS between autoclave and vacuum cured materials. The room temperature repair efficiencies are reported for single scarf repairs comprised of vacuum co-cured and precured patches. These vacuum cured repair efficiencies were found to be similar to the efficiency of the autoclave precured patch repair. This result supports the feasibility of scarf joint repairs with precured or co-cured patches under vacuum curing conditions in field level facilities. Therefore, repairs with vacuum precured or vacuum co-cured patches requiring less equipment seems to be a serious potential alternative to the composite patch repair requiring autoclave conditions which might be only available at depot level maintenance centers.Item Open Access A study on curing processes and environmental effects for rapid composite repair(2011) Elaldı, Faruk; Elaldı, PelinThis article focuses on scarf joint comprised of vacuum-precured, vacuum-cocured, autoclave-procured, and autoclave-cocured composite patches bonded to autoclave- and vacuum-precured parent laminates. Autoclave- and vacuum-cured parent laminates and scarf joints were prepared and exposed to the same temperature and moisture environment for comparison. All specimens were loaded in tension at three temperatures. Interlaminar shear strength (ILSS) tests were also carried out for the parent materials. As noted, the tensile strength and ILSS decrease when the material has been exposed to moisture and tested at elevated temperature. But, no significant difference was reported for either tensile strength or ILSS between autoclave- and vacuum-cured materials. The room temperature repair efficiencies are reported for single-scarf repairs comprised of vacuum-cocured and vacuum-precured patches. These vacuum-cured repair efficiencies were found to be similar to the efficiency of the autoclave-precured patch repair. This result supports the feasibility of scarf joint repairs with precured or cocured patches under vacuum curing conditions in field-level facilities. Therefore, repairs with vacuum-precured or vacuum-cocured patches requiring less equipments seem to be a serious potential alternative to the composite patch repair requiring autoclave conditions which might be only available at depot-level maintenance centers.