6 sonuçlar
Arama Sonuçları
Listeleniyor 1 - 6 / 6
Yayın Analysis of occupational health and safety data between 2003 -2015 in Turkey(PressAcademia, 2017-12-30) Ensari Özay, Müge; Coşkun, SeldenPurpose - The aim of this study was to analyse the officially recorded data of Turkey on occupational accidents by covering various kinds of data between the years 2003 - 2015. By this study a view is aimed to be taken over Turkey’s behaviour on occupational health and safety. Methodology – In this study, the statistical yearbook of the Social Security Institution (SSI) of the Republic of Turkey has been used as a data source. These data are arranged yearly and the trend is evaluated. Findings- The number of occupational accidents had fluctuations as increases and decreases between the years 2003-2012. After the year 2012, the number of occupational and fatal accidents had increased more than twice. The occupational accidents have occurred at the highest rates in the most populated and industrialized two cities in Turkey. Economic activities having the highest percentage of occupational accidents has been determined and interpretated. Conclusion- Occupational accidents can be reduced by taking effective and preventive measures. There are some tasks that should be fulfilled in order to create a secure work place by employers and employees. Employers should apply occupational health and safety legislation and take preventative measures and train the employers regularly against work related accidents. Furthermore, employees should be conscious and careful about the accidents and fulfill their obligations regarding to work safety while working. Public institutions should work more on creating a secure work place and creating a culture of work safety.Yayın Preparation and characterization of mesophase pitch based carbon foam produced at low pressure(Springer, 2015-08) Gül, Ayşenur; Yardım, Mehmet FerhatThe morphological changes during carbon foam synthesis depend on the process pressure and temperature, melting temperature, and viscosity of the mesophase pitch. This study is focused on interpreting the foaming mechanism and analysing the preparation process of mesophase pitch based carbon foams. Results have shown that more homogenous and better structured carbon foams were derived under higher pressure. The carbon foams exhibited higher density and strength at this pressure.Yayın The use of the density threshold value as a shape descriptor on the toxicity of benzene derivatives(Swift Journals, 2016-09-01) Ensari Özay, Müge; İnel, YükselThe Quantitative Structure Activity Relationship (QSAR) method, based on the three-dimensional (3D) shapes of formal molecular bodies and computed molecular descriptors, was used to calculate the octanol-water partition coefficient (logKow) of benzene derivatives to indicate their toxicity. The aim of this study is to use electron density threshold values as descriptors in predicting toxicology of benzene derivatives. Through Density Domain Analysis (DDA), a shape fragment database of benzene derivatives was constructed. Electron density threshold values were generated from molecular isodensity counter surfaces (MIDCO) of benzene molecules that were calculated at the ab initio HF/6-31G* level. Multiple linear regression analyses were performed, and two successful QSAR models were obtained. The analysis of variance (ANOVA) ratio for regression (F) and the significance of F (Fs) values was also used to evaluate the predictive power of the established QSAR models. The results indicate that the electron density threshold value, “a”, gives a specific description of the 3D shape of electron density clouds. These models were further analyzed by three 3D shape features as one local and two global descriptors based on the electron density threshold “a” value. The global and local properties of benzene derivatives were found to exhibit similar toxicity behaviors.Yayın Turkish health policies: past, present, and future(Routledge, 2020-08-18) Oğuz, Ahmet BünyanIn this article, health policies in Turkey from the 1900s to the present are reviewed in light of the available data on the number of health institutions, life expectancy, infant mortality, and state budget allocation. While a significant quantitative development is observed in the provision of health services, the state by far maintained a leading role in the provision of health services until the 1980s, when an initially weak but steady deviation began, significantly increasing its pace from 2002 and creating a new path where the private sector raised its share with the extensive implementation of neoliberal economic policies. The emergence of public-private partnership projects as a financing tool in the health sector, with various models from the 1990s around the world, found its place in the Turkish health system in the form of city hospitals from 2013, creating a new deviation in the provision of health services by the state.Yayın The effect of carbon materials on the properties of epoxy(Flogen Star OUTREACH, 2015-12-23) Gül, Ayşenur; Kamali, Ali; Fray, DerekNanostructured carbon composites can play important roles in lithium and other batteries. Preparation and characterisation of such composites are therefore important in further development of batteries. Carbon nanostructures including carbon nanotubes, nanoparticles and graphene can economically be produced in molten lithium chloride. The present work reports the influence of the molten salt synthesised carbon nanostructure filler and commercial graphite on the properties of epoxy resin. The carbon materials were incorporated into the polymer matrix to make composites. The carbon-epoxy composites produced were then characterized by a variety of techniques including scanning electron microscopy, x-ray diffractometry, and dynamic mechanical analysis. The thermal and mechanical properties of the nanocomposites were also measured. It was found that addition of carbon materials can enhance the properties of the epoxy matrix considerably.Yayın Safety and health concerns with lithium-ion batteries(Flogen Star OUTREACH, 2015-12-23) Gül, AyşenurThe lithium ion batteries consist of positive (inorganic lithium-intercalating compound and negative (lithium-intercalating carbon) electrodes and have an organic liquid electrolyte (a lithium salt in an organic liquid). They store lots of energy in a small and light package. Lithium-ion batteries are widely used in cordless communication technologies and equipment such as laptops, cell phones, and other mobile devices. Despite lithium ion batteries are produced with the high safety standards, plenty of incidents have been reported because of fire and explosion of lithium ion batteries in electronic devices or large vehicles and facilities. Therefore, lithium-ion batteries are optimized to store and release energy with respect to environmental, health, and safety issues. This work summarizes potential hazards and safety recommendations for their commercialization.
