Browsing by Author "Cetin S."

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Interrelationship of global social responsibility and social loafing (The case of public servants of Turkey)
(2020-01-01) Sadykova G.F.; Cetin S.; Atas H.
The article analyzes the relationship of indicators of global social responsibility and social loafing on the basis of a survey of public servants of the Turkish region of Kastamonu. Global social responsibility can be interpreted as the awareness of the need to preserve the stability of the world and social well-being. Social loafing assumes a significant decrease in the personal productivity of the group members during collective activity. This study revealed a negative correlation between aspects of global social responsibility and social loafing. The results indicate a polarity of these phenomena and are explained by mutually exclusive concepts of global social responsibility and social loafing; while the first personifies the constructive mechanism of social stability, the second is the destructive evasion of social identification and atrophy of values. In this context, an individual who is both an object and a subject of responsibility due to the influence of social norms, principles and values, must develop in terms of maintaining conscientiousness, spirituality, social inclusion and the implementation of humanization of society.
Investigation of effect of brick DFST and silica FFME on the properties of portland cement mortar
(2019-01-01) Bayraktar O.Y.; Citoglu G.S.; Belgin C.M.; Cetin S.; Cetin M.
In this study, the mechanical behaviors that can occur under the influence of high temperature in the mortars produced by silica fume and waste brick dust were investigated. For this purpose, Portland cement (CEM I), brick dust (BD) of brick factory waste, silica fume (SF) of ETİ electrometallurgy INC. industrial waste CEN standard sand and water were used in the production of mortar. Blended cements were obtained by using BD, SF and SFBD at 5.0%, 10.0%, 15.0% and 20.0% ratio with substitution method in Portland cement. Density, Blaine, initial set and final set tests were performed on the produced mortars and 40x40x160 mm sized mortar prism samples were obtained using these cements. These samples were exposed to five temperature effects as 20, 150, 300, 700 and 900 ° C. The mortar samples kept at 20 ° C were accepted as reference mortar. A total of 1053 samples were studied in two different ways of cooling mortars as air-cooling (spontaneously at 20 ° C ± 2 in laboratory environment) and sprinkling (water spraying). After the mortar samples reached at room temperature, flexional resistance and compressive strength tests were carried out on 7th, 28th and 90th days. According to the test results; it was determined that BD, SF and SFBD can be used as pozzolanic additives in cement mortars both alone and together and can be evaluated in buildings with high probability of fire up to certain temperature values.
Varitation of stomatal characteristics in broad leaved species based on habitat
(2019-01-01) Yigit N.; Cetin M.; Ozturk A.; Sevik H.; Cetin S.
This research aims to find the habitat-dependent variation of micromorphological characteristics in the leaves of Fraxinus excelsior (European ash), Platanus orientalis (Plane tree) and Tilia tomentosa (Silver lime) collected from 6 different cities of different climates. The leaves were collected in Turkey in the cities of Rize, Samsun, İzmir, Antalya, Sivas, and Ankara. Samsun and Rize fall under the Black Sea climate region, Ankara and Sivas under the continental climate, whereas Antalya and İzmir enjoy a Mediterranean climate. Using scanning electron microscopy (SEM) to highlight the visible morphological characteristics of the plant, we hoped to uncover how stress affects the micro-morphological properties of the plant but does not affect its vital functions. Leaf epidermis images were obtained with SEM and stoma width (μm), length (μm), pore width (μm), pore length (μm), and density (in an area of 1 mm2) measurements were obtained using Image J (https://imagej.net) software. A Duncan test and variance analysis were performed via SPSS® (IBM Analytics) and the habitat-dependent change of these characteristics was evaluated statistically. Accordingly, we determined that the stomatal characteristics varied depending on the habitat, but trees were affected differently by climate conditions. The micromorphological characteristics on the leaves depending on growth conditions were also investigated.