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RISS 인기검색어
- 검색키워드
- 저자 : Yildiz Ergun (검색결과 2 건)
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Investigation of Mass Transfer of Ozone in Jet Loop Reactor
Cengiz Ibrahim,Değermenci Nejdet,Yildiz Ergun,Barlak Melahat Semin 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
Mass transfer of ozone in a jet loop reactor was investigated in this study. Diff erent parameters such as ozone gas concentration, gas fl ow rate, circulation fl ow rate, and spray nozzle diameter were examined for their eff ect on mass transfer. In experiments with ozone gas concentrations ranging from 3.83 to 17.1 g/m 3 , the K L a values remained unchanged, with an average of 28.7 ± 2.2 h −1 . As the ozone gas concentration increased, the saturation values of ozone in the liquid phase also increased. Experiments were carried out with gas fl ow rates ranging from 50 to 250 L/h in the jet loop reactor, and increasing gas fl ow rates increased the K L a value up to fi ve times. When the eff ect of the liquid circulation fl ow rate was examined for a spray nozzle diameter of 15.5 mm, increasing the fl ow rate from 40 L/min to 80 L/min increased the K L a value by approximately 41%. However, the power consumed per reactor volume for this process increased 8 times and reached 2.65 kW/m 3 . K L a values in the JLR vary between 6.1 and 37.3 h −1 depending on operating parameters and it has been concluded that it performs well compared to its counterparts.
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Misirlioglu, Hasan Cem,Coskun-Breuneval, Mehtap,Kucukpilakci, Bulent,Ugur, Vahide Isil,Elgin, Yesim,Demirkasimoglu, Taciser,Kara, Sakire Pinar,Ozgen, Aytul,Sanri, Ergun,Guney, Yildiz Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20
Background: Postoperative chemoradiotherapy (CRT) of gastric carcinoma improves survival among high-risk patients. This study was undertaken to analyse long-term survival probability and the impact of certain covariates on the survival outcome in affected individuals. Materials and Methods: Between January 2000 and December 2005, 244 patients with gastric cancer underwent adjuvant radiotherapy (RT) in our institution. Data were retrieved retrospectively from patient files and analysed with SPSS version 21.0. Results: A total of 244 cases, with a male to female ratio of 2.2:1, were enrolled in the study. The median age of the patients was 52 years (range, 20-78 years). Surgical margin status was positive or close in 72 (33%) out of 220 patients. Postoperative adjuvant RT dose was 46 Gy. Median follow-up was 99 months (range, 79-132 months) and 23 months (range, 2-155 months) for surviving patients and all patients, respectively. Actuarial overall survival (OS) probability for 1-, 3-, 5- and 10-year was 79%, 37%, 24% and 16%, respectively. Actuarial progression free survival (PFS) probability was 69%, 34%, 23% and 16% in the same consecutive order. AJCC Stage I-II disease, subtotal gastrectomy and adjuvant CRT were significantly associated with improved OS and PFS in multivariate analyses. Surgical margin status or lymph node dissection type were not prognostic for survival. Conclusions: Postoperative CRT should be considered for all patients with high risk of recurrence after gastrectomy. Beside well-known prognostic factors such as stage, lymph node status and concurrent chemotherapy, the type of gastrectomy was an important prognostic factor in our series. With our findings we add to the discussion on the definition of required surgical margin for subtotal gastrectomy. We consider that our observations in gastric cancer patients in our clinic can be useful in the future randomised trials to point the way to improved outcomes.
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