Genç, Ayten | Zeydan, Özgür | Saraç, Selin

Article | 2019 | Waste Management and Research37 ( 9 ) , pp.906 - 913

The usage of plastics has exponentially increased in our daily lives over the past 50 years because of its durability, low costs and potential for diverse applications, such as widespread use as disposable items. In this study, first, the recycling cost of plastic wastes has been estimated by using actual data taken from a recycling centre, where plastic solid wastes were collected separately. The total amount of plastic wastes recycled at the centre was approximately 695 tonnes. The operating cost of plastics separation at the recycling centre, the transport of plastic wastes, labouring, maintenance, electricity, insurance and chem . . .ical costs were taken into consideration in the cost evaluation. Accordingly, the unit cost of recycling was calculated as US$0.40 kg-1 of plastic waste. This cost was compared with the predicted plastic recycling cost in the same region using statistical values. The predicted recycling cost was estimated based on assuming segregated collection by the municipalities of all PSW in municipal solid waste. Then the resulting unit cost of recycling was found to be US$0.25 kg-1 of plastic waste. In addition, the recycling costs were also evaluated including the revenue from the sales of recycled plastic granular. According to the evaluated total cost of plastic recycling, it can be concluded that mechanical recycling of plastics can only be an economical option if the recovery of plastics is improved. © The Author(s) 2019 Daha fazlası Daha az

Zeydan, Özgür | Wang, Yuhang

Article | 2019 | ATMOSPHERIC POLLUTION RESEARCH10 ( 5 ) , pp.1565 - 1576

Satellite based particulate matter (PM) pollution monitoring on a regional basis is of importance due in part to the adverse health effects of PM. In this study, Moderate Resolution Imaging Spectroradiometer (MODIS) derived aerosol optical depth (AOD) data at 3 km and 10 km resolutions from both Terra and Aqua satellites were used, in conjunction with the surface in situ data, to improve the regional distribution of ground-level PM2.5 over Turkey. Five years (2011-2015) of heating season's (15th October to 14th May) in situ PM2.5 measurements from 7 monitoring stations in Ankara and 3 years (2013-2015) of the same data from 13 monit . . .oring stations in Marmara Region were used. Linear and non-linear regression models were used to find the relationship between PM2.5 and AOD data. To improve the correlations between PM2.5 and AOD, the data points affected by free tropospheric long-range transport were removed from the analysis via back trajectory modeling analysis since long-range transport affects AOD more readily than surface PM2.5 data. Using non-linear models with the addition of meteorological parameters such as height of planetary boundary layer, surface temperature and surface wind speed improved the correlations significantly. The best non-linear model can explain 61% (n = 37, R-2 = 0.61, p < 0.001, RMSE = 0.337 mu g/m(3)) of PM2.5 variations at the Edirne Kesan site. It was found that Terra worked better than Aqua. Furthermore, 10-km aerosol products gave better correlations with PM2.5 as compared to the 3-km products. With the aid of spatiotemporal model, PM(2.5 )distribution maps are created for the first time for Turkey Daha fazlası Daha az

Erdoğan, Zeynep | Zeydan, Özgür | Sert, Havva

Article | 2008 | İstanbul Üniversitesi Florence Nightingale Hemşirelik Yüksekokulu Dergisi16 ( 61 ) , pp.71 - 76

Dünyanın iklimi jeolojik tarih boyunca birçok kez doğal olarak değişmiştir. Fakat, endüstri devriminden sonra fosil yakıtlarından kaynaklanan emisyonlar ve diğer sentetik sera gazlarının emisyonlarıyla artan sera etkisi nedeniyle sıcaklık kayıtlarında yükseliş trendi mevcuttur. Sera etkisi atmosferin ısı kapasitesini değiştirerek sıcaklık ve yağış anormalliklerine ve en sonunda da iklim değişikliğine neden olur. iklim değişiklinin etkileri ekosistemlerde, sosyal ve ekonomik yaşamda ve arazi kullanımıyla sınırlı olmayıp ayrıca, doğrudan ve dolaylı olarak insan sağlığı üzerine etkileri de vardır. Sıcak dalgalarına bağlı ölümler, solun . . .um ve dolaşım sistemi hastalıkları ve infeksiyon hastalıkları iklim değişikliği sonucunda ortaya çıkan sağlık sorunlarıdır. Earth's climate has changed naturally many times throughout the geological history. However, after the industrial revolution there exists a rising trend in temperature records due to increasing greenhouse effect, which is resulted from fossil fuel emissions and other synthetic greenhouse gasses emissions. Greenhouse effect changes heat capacity of atmosphere that causes temperature and precipitation anomalies and ultimately climate change. The effects of climate change will be seen in ecosystems, in social and economical life and in land use. Moreover, there are direct and indirect health effects of climate change on humans. Mortality depending on heat waves, respiratory and cardiovascular disease and infectious disease are the health problem resulted from climate change Daha fazlası Daha az