Retroperitonoscopic donor nephrectomy: a safe technique which prevents intraabdominal complications in donor in kidney transplantation

İstanbul Bilim Üniversitesi, Tıp Fakültesi.Canlıdan böbrek naklinde vericilerde oluşan en ciddi komplikasyonlar karın içi komplikasyonlara bağlı gelişmektedir. Böbrek vericisine konfor sağlaması nedeniyle son on yılda açık nefrektomi ameliyat tekniği yerini tamamen laparoskopik nefrektomiye bırakmıştır. Yapılan çalışmalarda nakledilen böbreğin fonksiyonu açısından iki teknik arasında farklılık gözlenmemiştir.The most serious complications in donor which happen during live renal transplantation are due to intra abdominal complications. To provide comfort to renal transplantation donor, laparoscopic technique took place of open technique in the last decade. In performed studies, any difference in terms of transplant kidney functions is not detected when compared two techniques

Evaluation of clinical follow-up of patients with arteriovenous fistula

İstanbul Bilim Üniversitesi, Tıp Fakültesi.Amaç: Hastaların çalışan arteriyovenöz fistül (AVF)’lerini böbrek nakli sonrası kapattırma veya kapattırmama istekleri, kararlarının nedenlerinin belirlenmesi, bu kararlarının diğer parametreler ile ilişkileri araştırıldı. Hastalar ve yöntemler: Araştırmanın örneklemini Ocak 2009 - Aralık 2015 tarihleri arasında İstanbul Şişli FNH’de böbrek nakli öncesi diyalize girmek için AVF açılan, nakil sonrası fistülleri çalışan 100 hasta (60 erkek, 40 kadın; ort. yaş 41.3±10.6 yıl; dağılım 22-65 yıl) oluşturdu. Hastaların sosyodemografik ve fistüle bağlı özellikleri, 25 maddelik Veri Toplama Formu ile sorgulandı.Objectives: This study aims to investigate the demands of the patients whether to close down or not to close down the working arteriovenous fistulas (AVF) subsequent to kidney transplantation, determining the reasons for decision, and relationships of these decision with other parameters. Patients and methods: The sampling of the study consists of 100 patients (60 males, 40 females; mean age 41.3±10.6 years; range 22 to 65 years), on whom AVF was opened before kidney transplantation and continued to work in the postoperative period in Istanbul Şişli FNH between January 2009 - December 2015. Sociodemographic and fistula-related characteristics of the patients were questioned using a 25-item Data Collection Form

Numerical Study on CFRP Strengthening of Reinforced Concrete Frames with Masonry Infill Walls

In the last decade, a new strengthening methodology has been developed for reinforced concrete (RC) frames with hollow clay tile (HCT) infill walls by means of diagonally applied carbon fiber-reinforced polymer (CFRP) fabrics. In the experimental part of a study conducted by the authors, this user-friendly methodology was experimentally investigated considering different aspect (height/width) ratios of the infill walls. In this study, first a numerical model of the FRP strengthened infill walls strengthened with the proposed methodology is developed. Afterwards, the numerical simulation results are validated by use of experimental response curves and finally, a parametric study, which further investigates the effect of aspect ratio of HCT infill walls is presented

Scale Effect on CFRP Strengthening of Infilled Reinforced Concrete Frames

The diagonal application of Carbon Fiber-Reinforced Polymer fabrics on hollow clay tile infill walls has been qualified as an efficient rehabilitation method for deficient reinforced concrete frames. However, majority of the experimental studies were conducted on 1/3-scaled RC frames and the effect of specimen scaling has not been questioned. In the current study, the results of an experimental campaign on 1/2-scaled RC frames are presented. Test specimens are grouped in two series having two different aspect ratios. In each series, there are two RC frames having hollow clay tile infill walls with/without CFRP reinforcement. The results of 1/2-scaled specimens are compared with the experimental results obtained from 1/3-scaled frames. In addition, the numerical model which were developed by the authors for 1/3scaled frames are employed for modeling 1/2-scaled specimens and the results were assessed by comparing with the test results

Testing and analysis of infilled reinforced concrete frames strengthened with CFRP reinforcement

There is an excessive demand for the rehabilitation of frame-type RC buildings which do not satisfy current seismic code provisions. Therefore, it is imperative to develop user-friendly strengthening methodologies which do not necessitate the evacuation of the building during rehabilitation period. The aim of this study was to strengthen the masonry infill walls by means of diagonal carbon fiber-reinforced polymer fabrics and to integrate them with the existing structural frame in order to form a new lateral load resisting system. This study investigated the possible effects of height-to-width ratio of the infills on the overall behavior attained by the previously developed rehabilitation methodology. In the first part of the study, eight 1/3 scaled, one-bay, two-story RC frames with two different aspect ratios were tested. The experimental results in terms of lateral stiffness, strength, drift, and energy dissipation characteristics of the specimens were discussed. In the second part, a numerical study of the frames was conducted to estimate the non-linear behavior of the specimens

AZO thin film-based UV sensors: effects of RF power on the films

Al-doped zinc oxide (AZO) thin films of thickness 150 nm were deposited on polyethylene terephthalate (PET) substrates by radio frequency (RF) magnetron sputtering method under various RF powers in the range of 25-100 W. Structural, morphological, optical and electrical properties of the films were investigated by X-ray diffractometer, atomic force microscope, UV-Vis spectrometer and Hall effect measurement system. All the obtained films had a highly preferred orientation along [002] direction of the c-axis perpendicular to the flexible PET substrate and had a high-quality surface. The energy band gap (E-g) values of the films varied in the range of 3.30-3.43 eV. The minimum resistivity of 1.84 x 10(-4) Omega cm was obtained at a 50 W RF power. The small changes in the RF power had a critical important role on the structural, optical and electrical properties of the sputtered AZO thin films on flexible PET substrate. In addition, UV sensing of the fabricated AZO thin film-based sensors was explored by using current-voltage (I-V) characteristics. The sensors were sensitive in the UV region of the electromagnetic spectrum