Showing 10 results for Aydin
Volume 8, Issue 2 (summer 2020)
Abstract
World literature is a reaction against unfulfillment and diminished satisfaction hereby national literature to be existed so. The vivid fulfillment is a solid world people and hidden one is a superiority and national excess as a matched hope of aims in this way. A solvtion of result is a coefficency among world literates to be gained by colture instrument beside of language and literature.
Goetheś aspects in this view of
world literature is a reaction of thoughts, aims and events through his days of life hence, those are many and much continuously canged. The essay to be fronted is trying to survey these Goetheś aspects towards world literature and his demands fulfilled from world literature as his situation to be matched by borders and know how to be accomplished
Volume 10, Issue 2 (Summer 2022)
Abstract
Johan Wolfgang von Goethe (1749-1832), a reflective thinker and speaker from Germany, firstly announced the world group of literature words in May 1827. His speech in demand of world literature has become an essence for writing and speaking among those world philosophers who were researchers of literature in that time. There are many gaps to be fulfilled on this subject matter. In the same way, the original demand of his direct willing in making world literature has not been reached to a certain result. At last, the following research on the bases of disputed conversations, biographies (self-writing and others), letters, and his essays could be the sources in the fulfillment of Goethe’s point of view about world literature. It is no doubt that Goethe's point of view and other thinkers and speakers from Germany in the decades of 18th and 19th centuries could be a means for other nations and countries in the way of gathering world literature considering awareness, sympathy, and preservation of the great combination of world literature basically in relation to Europe and Germany in that time. In the following research, considering a historical creation in the way of comparative literature, the original demand of Goethe about world literature was investigated
Volume 14, Issue 16 (Forth Special Issue 2015)
Abstract
In this paper, natural convection of Cu-Water nanofluid inside an enclosure which is partially filled with porous media, with internal heat generation has been studied numerically. Cu-water nanofluid was used where Maxwell and Brinkmen models determine its properties. Due to the low velocity of nanofluid, Darcy-Brinkman equation used for the modeling of porous media. In order to gain the maximum energy from the temperature dependent heat source, different parameters such as Rayleigh number, volume fraction of nanoparticles, porosity of porous matrix and heat conduction ratio has been investigated. The results show that increasing the volume fraction of nanofluid increases Nusselt number at all porosities and Nusselt will further increases at lower porosities. Changes of thermal conductivity ratio were effective only at low porosities and causes to fast conduction of generated heat and two-fold increase in Nusselt number. Moreover the porosity changes at different thermal conductivity ratio Cause to minimum Nusselt at the porosity of 0.4 to 0.6. Increasing Rayleigh number will lead to nanofluid penetration increase into the porous matrix and with further matrix cooling more increase in Nusselt number in all porosity ranges will be achieved.
Volume 15, Issue 3 (6-2024)
Abstract
Aspergillus has many species that are important in medicine, agriculture, and various industries. The genus has 446 identified species, which are difficult to distinguish from each other with the use of morphological characteristics. Xylan 1,4-beta-xylosidase is an enzyme that catalyzes the hydrolysis process of xylose in xylooligosaccharides and is produced by different species of Aspergillus. This research was conducted with the aim of a bioinformatics study of the gene region related to this enzyme and to evaluate its similarities and differences in some Aspergillus species. The results showed that this gene region, due to the presence of conserved motifs, was able to distinguish some species studied in this research.
Volume 18, Issue 9 (12-2018)
Abstract
Vibration waves with frequencies greater than 20 kHz, known as ultrasonic vibrations, are used in many manufacturing and engineering processes. This paper studies the occurrence of acoustic softening in steel specimens with three different microstructures. For this purpose, specimens with bainite and martensitic microstructures were created by Austempering and Quench heat treatments. The final dimensions of these specimens were obtained with Modal finite element analysis using ANSYS software so that the resonance frequency of the specimen is equal to the resonance frequency of transducer. Given that ultrasonic vibration induces a tension called vibrational stress to the crystal, this stress causes movement of dislocations and reduces the yield strength of specimens. In this paper 55 w / cm2 ultrasonic vibration, 18%, 12% and 8% yield strengths of specimens are reduced with ferrite- perlite, bainite and martensitic microstructure. Due to the absorption of vibrational energy by dislocation, the metal forming of these materials takes place with less energy. Also, in this paper, a numerical model for acoustic softening was investigated and it was found that there is a good correlation between numerical modeling and experimental e results.
Volume 18, Issue 9 (12-2018)
Abstract
The main purpose of this paper is to reveal the volume effect of ultrasonic vibrations on the plastic behavior of S355J2 steel specimens with different grain sizes and investigate the decrease in the Yield strength and ultimate strength of these steel specimens. For this study, samples of grain size of 10, 35 and 60 microns were created by performing various cycles of normalization and annealing heat treatments. An experimental setup was designed and developed for the tensile test with ultrasonic vibration. The tensile test was carried out at a room temperature and constant speed of 1 mm /min and it was found that by applying 390 watts of vibrations, the yield strength reduction of steel specimens with a grain size of 10, 35 and 60 microns was 8%, 18% and 27%, respectively. . The grain boundary length in fine-grain specimens is greater than the largest-grain specimens, therefore, the sound energy is distributed over the boundary. Therefore, the effect of applying ultrasonic vibrations on fine-grain specimens is less than that of largest grains and the yield strength and ultimate strength of fine-grain specimens showed a lower reduction
Volume 19, Issue 1 (1-2017)
Abstract
While weeds in sugar beet farming reduce crop yield and quality, they also lead to higher labor and material losses. In recent years, in order to eliminate or reduce the damage caused by weeds in sugar beet farming, weed control has gained importance. To this end, various studies have been conducted on robotic weed control by detecting weeds using image processing algorithms and hoeing or spraying the weeds. In this study, weeds in sugar beet fields were detected by the image processing algorithm and were sprayed with a liquid. When height of spraying nozzle above the ground was 30 cm and 50 cm, measurements of spraying robot were carried out for 8 different speeds. The weed surface covering area of spraying liquid was evaluated by two different methods. A decrease of 40% in nozzle height of smart spraying robot caused a decrease of about 12.18% at 4 different weeds surface covering area (cm2) of spraying liquid and a decrease of 16.70% at weed surface covering area (pixels) of spraying liquid.
Volume 19, Issue 131 (January 2022)
Abstract
In order to investigate the effect of GABA postharvest treatment on storage life and nutritional quality of fresh cut button mushroom, mushrooms treatment with five concentrations (0, 0.01, 0.1, 1 and 10 mM) of GABA done, and stored in the refrigerator for 15 days at a temperature of 4 °C and a relative humidity of 90±5 %, and the mushroom were sampled on days 0, 5, 10 and 15. The results showed that the concentration of 1 mM GABA had a greater effect on reducing the browning index of fresh cut button mushrooms than other concentrations of GABA. Reduction of electrolyte leakage and accumulation of malondialdehyde was observed in fresh cut mushrooms treated with a concentration of 1 mM GABA, which reduced weight loss in these mushrooms. High activity of phenylalanine ammonialyase enzyme in mushroom treated with 1 mM GABA increased the content of phenolic compounds which was associated with decreased activity of polyphenol oxidase enzyme. An increase in antioxidant capacity was observed in 1 mM GABA-treated mushrooms, which was accompanied by a significant increase in ascorbic acid accumulation in these mushrooms. Therefore, GABA as a safe and effective method can be used to increase the shelf life of fresh cut button mushrooms.
Volume 25, Issue 2 (7-2025)
Abstract
In this article, first, theoretical and code-based relationships of nominal shear strength of H-shaped members with respect to the strong axis, tubular, box-shaped, and H-shaped members with respect to the weak axis were studied. Then, the nominal shear strength of each mentioned section was evaluated using numerical modeling in Abaqus software. For numerical parametric evaluation, 35 members with different cross-sections were used. Each of these members was modeled in Abaqus software and each of them was subjected to both pushover and cyclic analyses. The lengths of each of these models were such that in all models, the shear limit state was more decisive than the flexural limit state. Based on this research, the results of the relationships presented in the AISC 360 for determining the nominal shear strength of H-shaped members with respect to the strong axis have very close conformity with the results of numerical modeling in Abaqus software, and at higher drifts, the results of the AISC 360 method are approximately 10% non-conservative. The results of the relationships presented in the AISC 360 for determining the nominal shear strength of tubular sections have very close conformity with the results of numerical modeling in Abaqus software, and at higher drifts, the results of the AISC 360 method are approximately 20% conservative. The results of the relationships presented in the AISC 360 for determining the nominal shear strength of box-shaped members have very close conformity with the results of numerical modeling in Abaqus software. The results of the relationships presented in the AISC 360 code for determining the nominal shear strength of H-shaped members with respect to the weak axis do not have close conformity with the results of numerical modeling in Abaqus software, and the nominal shear strength obtained from the AISC 360 is about 20% non-conservative.
Volume 27, Issue 2 (2-2025)
Abstract
While there is no yellowing in the leaf veins of some watermelons during the seedling stage, veins start to turn yellow after the plant starts to grow, and veins become more yellow as the plant grows. The aim of this study was to investigate whether this yellowing of leaf veins is related to plant nutrients. The study was carried out at the Alata Horticultural Research Institute in Mersin, Turkey, during the spring and summer growing seasons of 2016 and 2018. The S24 line with yellow veins and the Crimson Sweet variety were used as controls. Samples were taken from the leaves below and above the female flower during the female flower period and from the leaves below and above the fruit when the fruits reached the size of a grapefruit. Nitrogen (N), Phosphorus (P), potassium (K), Calcium (Ca), Magnesium (Mg), iron (Fe), Zinc (Zn), and Manganese (Mn) were examined in leaf analysis. When the places where the leaf samples were taken and the years were evaluated together, there was not a variety that came to the forefront in terms of N, P, K, Ca, Mn, and Zn. However, in general, Fe and Mn contents of the S24 line were found to be higher than the control. In line with these results, it is not possible to say that there is a relationship between the yellowing of leaf veins and plant nutrients.