Browsing by Author "Sen, N"
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Item The association of self-esteem, depression and body satisfaction with obesity among Turkish adolescentsOzmen, D; Ozmen, E; Ergin, D; Cetinkaya, AC; Sen, N; Dundar, PE; Taskin, EOBackground: The purpose of this study was to determine the prevalence of overweight and obesity and to examine the effects of actual weight status, perceived weight status and body satisfaction on self-esteem and depression in a high school population in Turkey. Methods: A cross-sectional survey of 2101 tenth-grade Turkish adolescents aged 15 - 18 was conducted. Body mass index (BMI) was calculated using weight and height measures. The overweight and obesity were based on the age- and gender-spesific BMI cut-off points of the International Obesity Task Force values. Self-esteem was measured using the Rosenberg Self-Esteem Scale, and depression was measured using Children's Depression Inventory. Logistic regression analysis was used to examine relationships among the variables. Results: Based on BMI cut-off points, 9.0% of the students were overweight and 1.1% were obese. Logistic regression analysis indicated that ( 1) being male and being from a higher socio-economical level were important in the prediction of overweight based on BMI; ( 2) being female and being from a higher socio-economical level were important in the prediction of perceived overweight; ( 3) being female was important in the prediction of body dissatisfaction; ( 4) body dissatisfaction was related to low self-esteem and depression, perceived overweight was related only to low self-esteem but actual overweight was not related to low self-esteem and depression in adolescents. Conclusion: The results of this study suggest that school-based adolescents in urban Turkey have a lower risk of overweight and obesity than adolescents in developed countries. The findings of this study suggest that psychological well-being of adolescents is more related to body satisfaction than actual and perceived weight status is.Item Gasoline- and diesel-like products from heavy oils via catalytic pyrolysisDemirbas, A; Al-Ghamdi, K; Sen, N; Aslan, A; Alalayah, WMHeavy oil is less expensive than light crude oil, but heavy oil is more expensive to obtain light oil products. Conventional light crude oil resources are decreasing, therefore heavy oil resources will be needed more in the future. There are huge differences from field to field for heavy oil deposits. In terms of final productive use, heavy oil is considered as an unconventional resource. Heavy oil upgrading depends on four important factors: catalyst selection, heavy oil classification, process design, and production economics. Heavy and extra-heavy oils are unconventional reservoirs of oil. Globally, 21.3% of total oil reserves are heavy oil. Heavy oil is composed of long chain organic molecules called heavy hydrocarbons. The thermal degradation of the heavy hydrocarbons in heavy oil generates liquid and gaseous products. All kinds of heavy oils contain asphaltenes, and therefore are considered to be very dense material. The most similar technologies for upgrading of heavy oils are pyrolysis and catalytic pyrolysis, thermal and catalytic cracking, and hydrocracking. The amount of liquid products obtained from pyrolysis of heavy oil was dependent on the temperature and the catalyst. Pyrolytic oil contains highly valuable light hydrocarbons as gasoline and diesel components range. The constant increase in the use of crude oils has raised prices of the most common commercial conventional products and consequently seeking for new alternative petroleum resources, like some unconventional oil resources, becomes an interesting issue. The mass contents of gasoline, diesel, and heavy oil in the crude oil are 44.6%, 38.3%, and 17.1%, respectively. The gasoline yield from the heavy oil catalytic (Na2CO3) pyrolysis is higher than the diesel efficiency for all conditions. The yield of gasoline products increases with increasing pyrolysis temperature (from 230 degrees C to 350 degrees C) and percentage of catalyst (from 5% to 10%). The yields of gasoline-like product are from 21.5% to 39.1% in 5% catalytic run and from 32.5% to 42.5% in 10% catalytic run. The yields of diesel-like product are from 9.3% to 29.8% in 5% catalytic run and from 15.5% to 33.7% in 10% catalytic run.Item Study on the Effects of Situation of Cigarette Smoking on University Students' Quality of LifeSen, N; Arslan, GG; Çoban, A; Güngör, N; Kulbakan, S; Solar, MThis study was conducted as a definition in order to determine the effects of university students' cigarrette smoking habits on their quality of life. Samples were selected among students of Celal Bayar University Medicine Faculty, Science- Literature Faculty, Economy and Business Administration Faculty, Engineering Faculty and Gym Sports and Health Highschools and Health Services Career Highschool (N=5963). In determination of number of sample students for this study, the Certain Universe Sampling Selection Method was used (n=278). The number of students to be elected from various classes was however determined by the Categorial Sampling Method. Study data were gathered between the dates of 7th of February and 10th of March 2005. In this study, Social-Demographic Information Form and WHOQOL-BREF Quality of life Scale were used as data gathering means. In statistical evaluation, number-percentage dispersions, average and standard deviation values and t-test were used. Average students' age of starting to smoke was 17.03 +/- 2.23. It was established that there is a significant connection between university students' starting smoking age and quality of life psychology field (p<0.05). There is a meaningful relation among fields of quality of life such as physics, psychology and social fields and student smoking habits (p=0.00 <0.05). It is determined that among these students who smoke half a packet of cigarettes have a significant, meaningful relation between their quality of life and physics field (p<0.05). The results obtained show that students' smoking situations affect their quality of life.Item Calculation of higher heating values of hydrocarbon compounds and fatty acidsDemirbas, A; Ak, N; Aslan, A; Sen, NHydrocarbon compounds are formed by carbon and hydrogen elements. The higher heating values (HHVs) of the hydrocarbon compounds can be calculated based on the carbon (C) and hydrogen (H) contents of the chemical structures. HHVs (MJ / kg) as a function of the carbon (C) and hydrogen (H) fractions of N-saturated hydrocarbons can be calculated by the following equation: According to this Equation, the HHV is a function of the percentages of the carbon (C) and hydrogen (H) of pure n-saturated hydrocarbon compounds. This Equation represents the correlation obtained by means of regression analysis. It is found that the calculated values shows mean difference of 0.18%. The correlation coefficient is 0.9955.HHVs as a function of the iodine value (IV) and the saponification value (SV) of fatty acids can be calculated by the following equation: HHV(MJ/kg) = 49.43 - 0.015(IV)-0.041(SV)Item Prediction of Flow Behavior and Deformation Analysis of AA5754 Sheet Metal at Warm and Hot TemperaturesSen, N; Civek, T; Ilhan, Ö; Yurt, ÖE; Çetin, MH; Simsir, HThe utilization of lightweight materials such as AA5754 aluminum alloys in the inner body panel parts of vehicles has been significantly important for automotive manufacturers to minimize the high fuel consumption by reducing the overall weight. In this study, the flow behavior of AA5754 sheet metal has been discussed by conducting uniaxial tensile tests at five different temperatures (RT, 200, 250, 300, 350 degrees C) and three strain rates (0.001, 0.01, 0.05 s(-1)). Additionally, the capability of Fields and Backofen (F&B) and Voce hardening rules in describing the flow behavior of AA5754 at different temperatures and strain rates has been investigated by conducting uniaxial tensile tests in finite element analysis. It has been found that the main deformation mechanisms for the AA5754 are the strain hardening mechanism up to 250 degrees C, strain hardening and dynamic recovery mechanisms at 300 degrees C, dynamic recrystallization and strain hardening mechanisms at 350 degrees C. While the F&B hardening rule has been able to successfully capture the flow behavior of AA5754 up to 250 degrees C with a 14.36% error, its capability has significantly reduced after 250 degrees C due to its incapability of describing the effects of dynamic recovery and recrystallization. Voce hardening model has been better able to describe the flow behavior of AA5754 at all the temperature levels than F&B model due to its saturation behavior.Item Pandemic of the century: COVID-19 in inflammatory rheumatic diseases of a national cohort with 3,532 patientsYurdakul, F; Bodur, H; Çengiz, AK; Durmaz, Y; Duruöz, MT; Kaya, T; Ketenci, S; Cüzdan, N; Güler, T; Günendi, Z; Sarikaya, S; Çapkin, E; Önder, ME; Melikoglu, MA; Gñzel, R; Sen, N; Ayna, AB; Akgül,Ö; Eser, E; Ataman, SObjectives: This study aimed to assess the clinical outcomes and risk factors for severe coronavirus disease 2019 (COVID-19) in patients with inflammatory rheumatic disease (IRD) of a national cohort. Patients and methods: The multicenter cross-sectional study was carried out between July 15, 2020, and February 28, 2021. Data collection was provided from a national network database system, and 3,532 IRD patients (2,359 males, 1,173 females; mean age: 48.7 +/- 13.9 years; range; 18 to 90 years) were analyzed. Demographics, clinics about rheumatic disease, comorbidities, smoking status, being infected with COVID-19, and the course of the infection were questioned by rheumatology specialists. Results: One hundred seventeen patients were infected with COVID-19, the hospitalization rate due to COVID-19 was 58.9%, and the mortality rate was 1.7%. There was no difference between the COVID-19 positive and negative groups in terms of rheumatic disease activities and receiving drugs. It was observed that patients with COVID-19 had worse compliance with isolation rules, and bacillus Calmette-Guerin (BCG) vaccination was less common. The mean age and the rate of smoking of hospitalized COVID-19 patients were higher than those without hospitalization. Conclusion: In this cohort, in which real-life data were analyzed, COVID-19 rates in IRD patients were similar to the general population for the same period. Compliance with the isolation rules and BCG vaccination attracted attention as components that reduce the risk of COVID-19 infection. The risk factors for hospitalization were older age and smoking.Item Small Cell Carcinomas of the Bladder Highly Express Somatostatin Receptor Type 2A: Impact on Prognosis and Treatment-A Multicenter Study of Urooncology Society, TurkeyNese, N; Kumbaraci, BS; Baydar, DE; Kiliçaslan, I; Sari, AA; Sen, S; Gönül, II; Kankaya, D; Özlük, Y; Ermete, M; Özagari, A; Bal, N; Kiremitçi, S; Yildiz, K; Tuna, B; Sen, N; Yörükoglu, KSmall cell carcinoma (SmCC) is a rare and aggressive neuroendocrine carcinoma of the bladder. Neuroendocrine carcinomas expressing somatostatin receptors (SSTR) in other viscera such as lung, pancreas, and gastrointestinal system respond to therapy with somatostatin analogs. In the present study, expressions of SSTRs 1 to 5 including type 2A are investigated by immunohistochemistry (IHC) and their relationship with clinicopathologic factors was evaluated. Hundred primary bladder SmCC cases were collected from 12 centers in Turkey. Forty-three cases were pure SmCC. Other cases had mostly papillary urothelial carcinoma as a second component. The percentage of the SmCC component ranged from 5% to 100%. SSTR-2A expression was membranous, whereas the other receptors showed cytoplasmic staining. The percentages of positive cases for SSTR-1, SSTR-2A, SSTR-3, SSTR-4, and SSTR-5 were 4% (3/75), 61.4% (54/88), 2.4% (2/84), 24.4% (20/82), and 6.25% (5/80), respectively. The percentage of SmCC component was positively correlated with the percentage of SSTR-2A expression (P=0.003) while negatively correlated with patient age (P=0.032). SSTR-2A expression was correlated with survival as a bad prognostic factor (P=0.018). SSTR-1, SSTR-3, SSTR-4, and SSTR-5 expressions did not show any statistical significance with any parameter. In conclusion, although the limited number of cases with adequate term follow-up, SSTR-2A expression could be a prognostic factor and somatostatin analogs therapeutic candidate for SmCCs of the bladder as these tumors show high percentage of SSTR-2A expression.Item What should be the appropriate minimal duration for patient examination and evaluation in pulmonary outpatient clinics?Musellim, B; Borekci, S; Uzan, G; Sak, ZHA; Ozdemir, SK; Altinisik, G; Altunbey, SA; Sen, N; Kilinc, O; Yorgancioglu, A; Yilmaz, N; Ulasli, SS; Salepci, B; Ocakli, B; Sokullu, ZGE; Uzun, O; Kurtulus, S; Uslu, S; Saritas, E; Genc, S; Annakkaya, AN; Aydin, O; Bilgin, C; Turk, M; Ozmen, I; Tasbakan, MS; Halis, AN; Bahcecioglu, SN; Dabak, G; Isik, SR; Ozturk, AB; Akgun, M; Pihtili, A; Ozkan, G; Balbay, EG; Okumus, G; Onen, ZP; Yasayancan, N; Uysal, FE; Hanta, I; Kaya, Z; Turker, H; Berkesoglu, C; Celik, P; Cetinkaya, PD; Gundogus, B; Ongen, G; Tuncay, E; Erboy, FINTRODUCTION: Patient examinations performed in a limited time period may lead to impairment in patient and physician relationship, defective and erroneous diagnosis, inappropriate prescriptions, less common use of preventive medicine practices, poor patient satisfaction, and increased violent acts against health-care staff. OBJECTIVE: This study aimed to determine the appropriate minimal duration of patient examination in the pulmonary practice. METHODS: A total of 49 researchers from ten different study groups of the Turkish Thoracic Society participated in the study. The researchers were asked to examine patients in an almost ideal manner, without time constraint under available conditions. RESULTS: A total of 1680 patient examinations were reviewed. The mean duration of patient examination in ideal conditions was determined to be 20.4 +/- 9.6 min. Among all steps of patient examination, the longest time was spent for taking medical history. The total time spent for patient examination was statistically significantly longer in the university hospitals than in the governmental hospitals and training and research hospitals (P < 0.001). Among different patient categories, the patients with a chronic disorder presenting for the first time and were referred from primary or secondary to tertiary care for further evaluation have required the longest time for patient examination. CONCLUSION: According to our study, the appropriate minimal duration for patient examination is 20 min. It has been observed that in university hospitals and in patients with chronic pulmonary diseases, this duration has been increased to above 25 min. The durations in clinical practice should be planned accordingly.Item Turkish Compliance and Adaptation of EULAR 2013 Recommendations for the Management of Rheumatoid Arthritis with Synthetic and Biological Disease-Modifying Antirheumatic Drugs: Expert Opinion of TLARAtaman, S; Sürmeli, ZS; Sunar, I; Özdemirel, E; Akinci, A; Bodur, H; Akgül, Ö; Altan, L; Altay, Z; Ayhan, F; Birtane, M; Soy Bugdayci, D; Çapkin, E; Cerrahoglu, L; Duruöz, MT; Günaydin, R; Günendi, Z; Gürer, G; Bal, A; Kaçar, C; Kaptanoglu, E; Kaya, T; Kocabas, H; Kotevoglu, N; Nas, K; Rezvani, A; Sen, N; Sendur, OF; Yalçin, PObjectives: This study aims to report Turkish League Against Rheumatism's assessment on the compliance of European League Against Rheumatism 2013 treatment recommendations for rheumatoid arthritis with practices in Turkish rheumatology clinics and adaptations for Turkey. Materials and methods: Members of Turkish League Against Rheumatism and one rheumatoid arthritis patient voted for the 2013 recommendations of the European League Against Rheumatism for treatment of rheumatoid arthritis in two sessions. An item was changed and voted again only if at least 70% of participants wanted a change. Strength of recommendations was calculated for the items. Strength of recommendations for the changed items in the first and second voting rounds was compared by Wilcoxon signed-rank test. In case of significant difference, the item with higher strength of recommendation was accepted. In case of no difference, the changed item was selected. Results: Three overarching principles and fourteen recommendations were assessed among which the three overarching principles were changed emphasizing the importance of physiatrists as well as rheumatologists for taking care of the patients. Third item was changed by adding composite indices for assessing disease activity. In the ninth recommendation, rituximab was suggested as a first line drug independent of situations like latent tuberculosis or lymphoma, etc. In the 11th recommendation, unlike European League Against Rheumatism, our committee did not suggest any thought about tofacitinib, as then it had not been approved in Turkey. Remaining principles were accepted as the same. Conclusion: Expert opinion of Turkish League Against Rheumatism for treatment of rheumatoid arthritis patients was formed for practices in Turkish clinics.