Experimental Investigation and Mathematical Modeling of Commercially Available R744 Compressors

The vapor compression cycle using refrigerant CFC (chlorofluorocarbon) and HCFC (hydrochlorofluorocarbon) is widely used in refrigeration, air-conditioning and water heating industries. Utilization of these gases are prohibited by the Montreal Protocol. The critical temperature of carbon dioxide (CO2) is much lower than that of the other refrigerants, namely 31.06°C. The gas cooling process occurs at a constant pressure but at variable temperatures takes the place of the condensation process that occurs at both constant pressure and temperature. Domestic type refrigerators use smaller compressor capacities between 100 W to 300 W. Data on CO2 (R744) refrigeration cooling cycle applications and calorimetric measurements are not available in the market and literature. Utilizing the experimental setup, our research group has developed a model for mass flow rate and compressor power of commercially available R744 compressors at different pressures and temperatures. In this article, experimental results and mathematical model calculations will be presented and discussed

Vidian Canal Types and Dehiscence of the Bony Roof of the Canal: An Anatomical Study

Objective: To determine the prevalence of Vidian canal types and dehiscence of the bony roof of the canal.Methods: This study included 594 patients (391 males and 203 females; average age, 32.43±11.98 years; range, 18-65 years). Computed tomography (CT) images were analyzed in terms of the prevalence of Vidian canal types and dehiscence of the bony roof of the canal.Results: Vidian canal types 1, 2, and 3 based on the sphenoid sinus body were found on the right side in 33.8%, 29.7%, and 6.5%, and on the left side in 36.4%, 27.4%, and 36.2% of the patients, respectively. Dehiscence of the bony roof of the canal was found on the right side in 22.2% of the patients and on the left side in 26.6%. In terms of Vidian canal types based on the sphenoid sinus floor, types 1, 2, 3, and 4 were found on the right side in 53.5%, 27.4%, 7.6%, and 11.5%, and on the left side in 54.9%, 26.6%, 6.6%, and 11.9% of the patients, respectively. On the right side, Vidian canal type 2 was significantly (p=0.002) more frequent in males than in females.Conclusion:When studying the complex anatomy of the sphenoid sinus, it is essential to consider Vidian canal types. Before endoscopic sinus surgery the Vidian canal and other anatomical structures should be carefully evaluated in all patients during preoperative paranasal sinus CT imaging to avoid complications

Assessment of Effects of Septoplasty on Acoustic Parameters of Voice: A Prospective Clinical Study

Objective:To investigate the effects of septoplasty on the acoustic parameters of voice.Methods:In total, 23 patients (seven females and 16 males; average age, 32.13±9.67 years; age range: 19-56 years) with a diagnosis of nasal septal deviation and who underwent septoplasty were included. Preoperative and on postoperative 30th day, acoustic analysis of voice was conducted for all patients. The recordings of /mana/ vowel were used to evaluate average fundamental frequency (F0), jitter, shimmer, and noise-to-harmony ratio (NHR). F0, shimmer percent, jitter percent, and NHR of two terms were compared. A p-value<0.05 was considered to indicate statistical significance.Results:A statistically significant change was not observed in F0 (p=0.741), jitter (p=0.930), and shimmer (p=0.128) measured preoperatively and on postoperative day 30. However, the increase in NHR measured on postoperative day 30 were statistically significant compared with preoperative NHR (p=0.017).Conclusion:According to the findings of this study, except NHR value, no statistically significant changes on F0, jitter and shimmer were detected after septoplasty

Hava Durumu Uygulaması

Java Spring Boot ile geliştirilmiş olan bu proje, Controller üzerinden dakika başına belirli istekleri WeatherStack API’sine HTTP/GET yöntemiyle ileterek işlevsel bir hava durumu uygulaması oluşturmayı amaçlamaktadır. WeatherStack’ten elde edilen API anahtarı, Postman aracılığıyla bir REST API kullanılarak edinilir. Bu proje, kullanıcıya şehir bazlı hava durumu bilgilerini anlık olarak getirme ve görüntüleme imkanı sunar

Does Intubation Affect Survival Among Patients Experiencing In-Hospital Cardiopulmonary Arrest?

Aim: Cardiopulmonary arrest is an important public health problem that contributes substantially to in-hospital morbidity and mortality. The present study aimed to determine the factors that affect in-hospital mortality and determine whether intubation contributes to survival among patients experiencing in-hospital cardiopulmonary arrest. Material and Methods: This retrospective, cross-sectional study was conducted by examining the event notification forms of all patients with a "Code Blue" call between January 1, 2014, and December 31, 2018. Patients who died and those who did not die after intervention were compared concerning age, sex, location and time of the call, and interventions implemented. Patients who received cardiopulmonary resuscitation alone and those who received cardiopulmonary resuscitation + intubation were compared concerning in-hospital mortality; p-values &lt; 0.05 were considered statistically significant. Results: In total, 924 patients were included in the present study. The most frequent calls were made from the wards in the hospital, at a rate of 64.4%. The in-hospital mortality rate was 42.4%. In-hospital mortality rates were significantly higher in the elderly, in those who were given overtime and service calls, and in those who received cardiopulmonary resuscitation or cardiopulmonary resuscitation + intubation. Among patients who received CPR, intubation did not affect survival. Sex, age, time of call, and intervention were significant predictors of in-hospital mortality. Conclusion: Code blue calls occurred primarily in the hospital wards outside of working hours, and improper call rates were high. Moreover, age, location and time of call, and interventions were independent risk factors for in-hospital mortality; intubation did not contribute to survival among patients experiencing in-hospital cardiopulmonary arrest

Allogeneic stem cell transplantation in a blast-phase chronic myeloid leukemia patient with carbapenem-resistant Klebsiella pneumoniae tricuspid valve endocarditis: A case report

WOS: 000453168200003PubMed ID: 27699025In chronic myeloid leukemia (CML), the occurrence of blastic transformation is rare. Treatment outcome is generally poor. Allogeneic stem cell transplantation (allo-SCT) is the only potentially curative treatment option for advanced-phase CML. Infections caused by carbapenem-resistant Klebsiella pneumoniae (CRKP) isolates are associated with high morbidity and mortality rates, particularly in patients with haematological malignancies. Infection and colonization by these multiresistant bacteria may represent a challenge in SCT recipients for the management of post-transplantation complications, as well as for the eligibility to receive a transplant in patients who acquire the pathogen prior to the procedure. We herein report the case of a blast-phase CML patient with a highly resistant, CRKP-associated tricuspid valve endocarditis, who was treated with a combination of systemic antimicrobial therapy and surgical valve repair, and subsequently underwent a successful allo-SCT

Bulutsuzluk Özlemi'nin öncülük ettiği, Türkiye'de rock müziği'nin 70'li ve 80'li yıllardaki tarihsel gelişimi

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2014.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Yeni, Harun