Storage Capacity of Extremely Diluted Hopfield Model

The storage capacity of the extremely diluted Hopfield Model is studied by using Monte Carlo techniques. In this work, instead of diluting the synapses according to a given distribution, the dilution of the synapses is obtained systematically by retaining only the synapses with dominant contributions. It is observed that by using the prescribed dilution method the critical storage capacity of the system increases with decreasing number of synapses per neuron reaching almost the value obtained from mean-field calculations. It is also shown that the increase of the storage capacity of the diluted system depends on the storage capacity of the fully connected Hopfield Model and the fraction of the diluted synapses.Comment: Latex, 14 pages, 4 eps figure

A maʿcūn recipe from the 18th century

Abstract of maʿcūn recipe from the 18th centur

CHARACTERIZATION, FUNCTIONALIZATION AND BIOLOGICAL EVALUATION OF CARBON NANOSTRUCTURES

Carbon nanostructures are gaining attention due to their promising properties for a wide range of applications from electrochromic devices to drug nanocarriers. Among the members of carbon nanostructure family, nanodiamonds (NDs), graphene quantum dots (GQDs), carbon dots (CDs) and multi-walled carbon nanotubes (MWCNTs) were used in this research project. Different functionalization reactions were performed on carbon nanostructures and the obtained products were characterized and evaluated. Rhamnose, imidazolium containing ionic liquids, 2-(2-(2-(2-aminoethoxy)ethoxy)ethyl)isoindoline-1,3-dione and tert-butyl (2-(2-(2-aminoethoxy)ethoxy)ethyl)carbamate were some organic molecules used for functionalizations in order to improve the solubility of carbon nanostructures and add different physical, electronic and biological properties. Despite promising properties, nanodiamonds tend to create big aggregates in aqueous media and this is the main obstacle for biological applications. It was shown that NDs with proper functionalizations can be dispersed in water and create stable dispersions. Thanks to fluorescent labeling with fluorescein isothiocyanate, NDs have been demonstrated to be promising nanocarrier for the delivery of functionalized molecules on their surface. The functionalization reactions of NDs were performed with different methodologies. NDs were demonstrated to be a performance tuning additive in electrochromic devices. Graphene Quantum Dots were produced with a methodology developed by the research group. Different modifications were performed in order to improve the production. GQDs were functionalized with different organic molecules with different methodologies such as amide bond generation and cycloaddition. It was demonstrated that GQDs have big potential to improve the performance of electrochromic devices. Carbon dots were produced from natural chitin resources: insect exoskeleton and shell of shrimp. It is shown that CDs produced from these natural and renewable resources are strongly fluorescent. CDs obtained from the new production methodology were characterized. Two different types of MWCNTs were functionalized and characterized for the comparison with other carbon nanostructures. The functionalization reactions were optimized in order to obtain high degree of functionalization. New physical, biological and electronic properties were introduced to carbon nanostructures through various functionalization reactions. Graphene quantum dots and carbon dots were produced by using new methodologies. Characterization studies were performed with different techniques, such as TGA, AFM and Raman spectroscopy. Nanodiamonds were evaluated in human peripheral blood mononuclear cells for biomedical applications. Graphene quantum dots and nanodiamonds were evaluated in electrochromic devices for possible performance improvements

“İngilizce Öğretim Yöntemleri” Dersini Alan Öğretmen Adaylarının Öğrenme Deneyimlerinin İncelenmesi

This study examines the learning experiences of non-native pre-service teachers in an English language teaching methods course. The study investigates the effect of the learning experiences used in the course on the teacher candidates’ opinions about language teaching methodology. The course employed various modes of learning, including peer teaching, video recordings that exemplify language teaching methodologies, discussions, written reflections, and a paper in which the teacher candidates explained their philosophy of teaching. The data were collected from the responses of teacher candidates who took the course in the fall semester of 2008-2009 at an English-medium university in Istanbul. The findings reveal the ways in which the teacher candidates engaged in various learning experiences and developed a perspective of second language teaching methodologies. The article describes various learning experiences and includes some written responses of teacher candidates who took the course.Bu çalışma, İngilizce öğretim yöntemleri dersinde anadili İngilizce olmayan öğretmen adaylarının öğrenme deneyimlerini incelemektedir. Çalışma, derste kullanılan öğrenme deneyimlerinin, öğretmen adaylarının dil öğretim yöntemleri hakkındaki görüşlerine olan etkisini araştırmaktadır. İngilizce öğretim yöntemleri dersi, akran öğretimi, yabancı dil öğretim yöntemlerini gösteren video kayıtları, tartışma oturumları, yazılı fikir paylaşımları ve öğretmen adaylarının öğretim felsefelerini açıkladığı raporlar gibi çeşitli öğrenme etkinliklerini kullanmıştır. Veriler, İstanbul’da bulunan ve eğitim dili İngilizce olan bir üniversitenin 2008- 2009 akademik yılı güz döneminde dersi alan öğretmen adaylarının görüşlerinden derlenmiştir. Bulgular, öğretmen adaylarının çeşitli öğrenme deneyimlerine katılma yollarını ve ikinci dil öğretim yöntemlerine yönelik geliştirdikleri görüşleri açıklamaktadır. Makale, çeşitli öğrenim deneyimlerini betimlerken, dersi alan öğretmen adaylarının yazılı görüşlerini de içermektedir

Leakage performance of a novel turbomachinery shaft seal

Advanced sealing systems are needed to control parasitic leakage flows to achieve high turbine engine efficiency and low emissions. Typical extreme turbomachinery engine operating conditions when combined rotor excursions do not lend simple sealing solutions. This work presents an in-depth analysis of a novel robust yet simple sealing system that is capable of maintaining long life under high speed and high temperature operating conditions. The proposed seal design is actually a gas bearing that is carefully tailored, analyzed, and designed to function as a differential pressure seal. The design involves a simple rigid/semi-flexible seal ring that is attached to a stationary support plate via flexible metal cloth structure. The seal body is capable of moving under the effect of hydrodynamic lift force. Therefore, above a certain clearance limit, which ensures that asperity contact is avoided, the seal follows shaft excursions to avoid damaging hard rubs

Reliability risk assessment in high rise buildings in case of fire

The practice of structural fire safety engineering remains to be case-specific and the estimation of fire resistance of structures is mostly deterministic. Many researchers in structural fire engineering utilize the performancebased design method but these studies do not include the inherent uncertainties in both the demand and capacity. This paper investigates the structural fire reliability of tall buildings based on the framework used for earthquake hazard by the Pacific Earthquake Engineering Research (PEER) and Eurocode. The financial district of Istanbul in Turkey is taken as a case study for this research. Parameters such as building type and height, structural system, number of floors, floor area, number of elevators and stairs, the use of fire suppression systems, evacuation routes are provided by the municipalities in order to develop a probabilistic methodology to estimate the fire safety of these structures. The analysis is conducted by estimating the intensity or the hazard curve as described by PEER framework. The hazard domain includes random variables such as the fire load, the opening factor, the fire duration and the maximum fire temperature. The findings of this research will provide essential information on the fire safety risk of each tall building in a densely populated financial district. It will allow the municipalities and fire brigades to have a probabilistic risk assessment of these structures and develop evacuation and human rescue plans accordingly in case of a fire hazard. Further, this research will provide useful data to insurance companies to estimate fire hazard insurance premiums

INVESTIGATION OF THE HEALTHY LIFESTYLE BEHAVIOR OF AFAD SEARCH AND RESCUE TECHNICIANS IN TERMS OF VARIOUS VARIABLES

Due to its tectonic structure, Turkey is one of the most earthquake-prone countries where a large part of its lands is under seismic danger. The aim of this study; The aim of this study is to examine the healthy lifestyle behaviors of Turkey AFAD Search and Rescue Technicians in terms of various variables and to evaluate their healthy lifestyle behaviors. 112 AFAD search and rescue technicians were included in the study. A structured questionnaire consisting of two parts was used as the data collection method in the research. In the first part of the form, a questionnaire consisting of questions determining the descriptive features was applied, and in the second part, the healthy lifestyle behaviors scale was applied. The validity and reliability study of the scale was carried out by Bahar et al. in 2008 and it was adapted to Turkish. SPSS statistical package program was used for statistical analysis of the obtained data. As a result of the analysis of the data obtained, all of the search and rescue technicians (n:111) participating in the study were male, and more than half of them (87.4%) were married. The age range in which the participants are concentrated is between 42-49 and 63.1% (n:70). 77.5% (n:86) of Search and Rescue Technicians are undergraduate graduates and 37.8% (n:42) of them have been doing this job for 16-20 years. A statistically significant difference was found between the healthy lifestyle total scores and sub-dimension scores of the participants in terms of sleep, marital status, branch, education status and age (p<0.05). In terms of smoking addiction, experience, body mass index, alcohol use and chronic disease variables, no statistically significant difference was found between healthy lifestyle total scores and sub-dimension scores (p<0.05). As a result, healthy lifestyle behaviors of AFAD search and rescue technicians were not at a sufficient level and it is thought that it would be appropriate to carry out studies to develop them. For all that it is thought that the number of female search and rescue technicians is insufficient and it would be beneficial to carry out studies to increase it.  Article visualizations

INVESTIGATION OF THE EFFECT OF PHYSICAL ACTIVITY LEVELS ON QUALITY OF LIFE OF PATIENTS WITH COVID -19

It is thought that knowing the situations that minimize the negative effects of Covid-19 on human health will be useful in the fight against the epidemic. In this study, it was aimed to investigate the relationship between the level of physical activity and the effect of Covid-19 on quality of life. 200 people who had previously had Covid-19 participated in the study voluntarily. An international physical activity questionnaire was applied to the participants to determine their pre-disease physical activity levels, and an international quality of life scale was applied to determine the effect of Covid-19 on the quality of life during the disease. SPSS 22 package program was used in the analysis of the data. In the study, the relationship between age, marital status, gender, education and physical activity level and the effect of Covid-19 disease on quality of life was examined. There was no statistically significant difference between the age, gender and marital status of the participants and the scores they got from the quality-of-life questionnaire (p<0.05). On the other hand, there was a statistically significant difference between the education levels of the participants and the scores they received from the quality of life, between those who received high school education and those who received education at the undergraduate level, in favor of those who received undergraduate education, in general health scores and social health scores (p<0.05). On the other hand, the general health score between the physical activity level and the quality-of-life scores, the physical activity level between the active and the very active, in favor of the very active, the general health score between the inactive and the active and the very active, the general health score in favor of the active and very active statistically significant difference was found (p<0.05). As a result, it can be said that those with good educational status and those with active and very active physical activity levels are more advantageous in feeling less of the symptoms associated with Covid-19 and reducing its negative impact on quality of life.  Article visualizations

Opinion of primary school teachers about the Culturally responsive education practices used in the life Studies Lessons: Implementation of the practices used in the US to Turkey

Culturally Responsive Education (CRE) has been found to be an effective method of teaching because it focuses on academic success for all students, cultural competencies, and sociopolitical aspects and has been proven effective among school cultures that are diverse in demographics. The aim of this research is to reveal opinion of primary school teachers about the Culturally responsive education practices used in the life studies courses. Within the scope of this aim, culturally responsive practices used in the USA were implemented in classrooms in Turkey, and at the end of these practices, teachers' opinions on these applications were examined. In this study, phenomenology, one of the qualitative research methods, was used. This qualitative research design tries to explain what exactly the experiences of many people about a certain concept or event mean. The working group of this research consists of 14 primary school teachers. In order to collect the main data of the research, interviews were conducted with the teachers using a semi-structured interview form. These collected data were transferred to the computer and analyzed with the help of the MAXQDA 2020 software. In addition to the main data of the research, sociometry and sociogram techniques were used to collect additional data. According to the data obtained, it was determined that these practices had two main effects. One of these main effects is the effect on students and the other is the effect on teachers