CHARACTERIZATION OF POLY(N-ETHYLANILINE) AND POLY(ANILINE-CO-N-ETHYLANILINE) AS SUPERCAPACITOR ACTIVE MATERIALS IN NONAQUEOUS MEDIUM

Poli(N-etilanilin) (PNEA) ve poli(anilin-ko-N-etilanilin) filmleri 0.1 M tetraetilamonyumtetrafloroborat (TEABF4) içeren asetonitril (ACN) çözeltisi kullanılarak dönüşümlü voltametri (CV)yöntemiyle kalem grafit elektrot (PGE) yüzeyinde sentezlenmiştir. Elde edilen filmlerin elektrokimyasalkarakterizasyonu monomersiz çözeltiler içerisinde CV yöntemi kullanılarak gerçekleştirilmiştir.Filmlerin yüzey morfolojileri taramalı elektron mikroskobu (SEM) ile görüntülenmiştir. Polimer filmikaplı PGE’ların (PGE/PNEA ve PGE/co-PNEA) elektrokimyasal enerji depolama özellikleri CV,elektrokimyasal empedans spektroskopisi (EIS), galvanostatik şarj-deşarj ve tekrarlanankronopotansiyometri yöntemleriyle araştırılmıştır. PGE/PNEA ve PGE/co-PNEA için en yüksekspesifik kapasitans değerleri galvanostatik şarj-deşarj yöntemi ile 0.01 mA akımda sırasıyla 1112.72 and1830.00 mF g-1PGE/PNEA’un PGE/co-PNEA’tan daha yüksek şarj-deşarj kararlılığına sahip olduğu gözlenmiştir.olarak elde edilmiştir. Tekrarlanan kronopotansiyometri yöntemine gör

CORROSION INHIBITION OF BENZOTRIAZOLE AND N-MESYL BENZOTRIAZOLE ON LOW CARBON STEEL IN SULFURIC ACID

This study examines usage of benzotriazole (Bt) and N-mesyl benzotriazole (BtSO₂CH₃) for im- provement of corrosion resistance of low carbon steel (LCS) in 0.1 M sulfuric acid (H₂SO₄). The inhibitor effect of Bt and BtSO₂CH₃ on the corrosion behavior of LCS was studied using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves and polarization resistance techniques. Under investigated experimental conditions these compounds showed a good corrosion inhibition. The inhibition efficiency of BtSO₂CH₃ was more than that of Bt. The potentiodynamic polarization curves indicated that compounds are mixed type inhibitors. The inhibiting properties of compounds were found to depend on the concentration. The adsorption mechanism of compounds was investigated using different adsorption isotherms. The equilibrium constants and free energies of adsorption using the adsorption isotherms were calculated

Uygulamalı Bilimler ve Mühendislik

Bu çalışma 0,1 M sülfürik asit içinde düşük karbon çeliğinin (LCS) korozyon direncini arttırmak için benzotriazol (Bt) ve yeni sentezlenen N-mesil benzotriazol (BtSO2CH3) kullanımını incelemektedir. LCS’nin korozyon davranışına karşı Bt ve BtSO2CH3’ün inhibitör etkisi, elektrokimyasal empedans spektroskopisi (EIS), potansiyodinamik polarizasyon eğrileri ve polarizasyon direnci teknikleri kullanılarak çalışılmıştır. Belirtilen deneysel koşullarda bu bileşikler iyi bir korozyon inhibisyonu göstermektedir. BtSO2CH3’ün inhibitör etkinliği, Bt’ün inhibitör etkinliğinden daha fazladır. Potansiyodinamik polarizasyon eğrileri bileşiklerin karma inhibitör olduğunu göstermektedir. Bileşiklerin inhibisyon özelliklerinin derişime bağlı olduğu bulunmuştur. Bileşiklerin adsorpsiyon mekanizmaları farklı adsorpsiyon izotermleri kullanılarak incelenmiştir. Aynı zamanda serbest enerji ve denge sabiti değerleri adsorpsiyon izotermlerinden hesaplanmıştı

Tarih içinde Türkiye-IMF ilişkileri

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2016.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Ünsal, Mehmet Süha

The Impact of CoronaVac Vaccination on 28-day Mortality Rate of Critically Ill Patients with COVID-19 in Türkiye

Background:Vaccines against coronavirus disease-19 (COVID-19) have been effective in preventing symptomatic diseases, hospitalizations, and intensive care unit (ICU) admissions. However, data regarding the effectiveness of COVID-19 vaccines in reducing mortality among critically ill patients with COVID-19 remains unclear.Aims:To determine the vaccination status and investigate the impact of the COVID-19 vaccine on the 28-day mortality in critically ill patients with COVID-19.Study Design:Multicenter prospective observational clinical study.Methods:This study was conducted in 60 hospitals with ICUs managing critically ill patients with COVID-19. Patients aged ≥ 18 years with confirmed COVID-19 who were admitted to the ICU were included. The present study had two phases. The first phase was designed as a one-day point prevalence study, and demographic and clinical findings were evaluated. In the second phase, the 28-day mortality was evaluated.Results:As of August 11, 2021, 921 patients were enrolled in the study. The mean age of the patients was 65.42 ± 16.74 years, and 48.6% (n = 448) were female. Among the critically ill patients with COVID-19, 52.6% (n = 484) were unvaccinated, 7.7% (n = 71) were incompletely vaccinated, and 39.8% (n = 366) were fully vaccinated. A subgroup analysis of 817 patients who were unvaccinated (n = 484) or who had received two doses of the CoronaVac vaccine (n = 333) was performed. The 28-day mortality rate was 56.8% (n = 275) and 57.4% (n = 191) in the unvaccinated and two-dose CoronaVac groups, respectively. The 28-day mortality was associated with age, hypertension, the number of comorbidities, type of respiratory support, and APACHE II and sequential organ failure assessment scores (p < 0.05). The odds ratio for the 28-day mortality among those who had received two doses of CoronaVac was 0.591 (95% confidence interval: 0.413-0.848) (p = 0.004).Conclusion:Vaccination with at least two doses of CoronaVac within six months significantly decreased mortality in vaccinated patients than in unvaccinated patients