İstanbul Esenyurt University Institutional Repository
DSpace@Esenyurt digitally stores academic resources such as books, articles, dissertations, bulletins, reports, research data published directly or indirectly by İstanbul Esenyurt University at international standards, helps track the academic performance of the university, provides long term preservation for resources and makes publications available to Open Access in accordance with their copyright to increase the effect of publications.
Recent Submissions
Use of the UPOINT Classification in Turkish Chronic Prostatitis or Chronic Pelvic Pain Syndrome Patients
(Elsevier Science Inc, 2016)
OBJECTIVE To determine the positive subdomain numbers and distribution of the UPOINT classification in chronic prostatitis and to compare the erectile dysfunction (ED) pattern. MATERIALS AND METHODS From 2008 to 2013, 839 patients with symptomatic chronic prostatitis or chronic pelvic pain syndrome were included in this study. The correlation between UPOINT domains and National Institutes of Health chronic prostatitis symptom index (NIH-CPSI) total score, subscores, and the 5-item International Index of Erectile Function scores were evaluated retrospectively. RESULTS The mean patient age was calculated as 37.7 +/- 7.4 (range 21-65). The average total NIH-CPSI score was determined as 9.07 (range 1-40) and the average positive UPOINT subdomain number was determined as 2.87 +/- 0.32 (range 1-6). Subdomain patient numbers and rates were calculated as 529 urinary (63%), 462 psychosocial (55%), 382 organ specific (45%), 290 infection (34%), 288 neurological or systemic (34%), and 418 tenderness (skeletal muscle) (50%), respectively. It was determined that ED, determining the subdomain of sexual dysfunction in patients, was positive in a total of 326 (39.9%) patients, with 220 patients having mild (26.2%), 76 mild to moderate (9.1%), 19 moderate (2.3%), and 5 with severe (0.6%) ED. A statistically significant correlation was not determined between the 5-item International Index of Erectile Function score and UPOINT subdomain number and NIH-CPSI score. CONCLUSION It has been determined that although there is a strong and significant correlation between UPOINT classification and NIH-CPSI score in Turkish patients with chronic prostatitis or chronic pelvic pain syndrome, the inclusion of ED as an independent subdomain to the UPOINT classification is not statistically significant. (C) 2016 Elsevier Inc.
The role of masonry infills on the interstory drift demand of reinforced concrete frames
(Elsevier Sci Ltd, 2024)
Most frame buildings, especially those with shear -type moment resistance frames, are affected by masonry infill panels, which change the mechanical properties of whole systems in a big way. In turn, seismic performance varies depending on the infill panel and frame interactions. In conventional structural design practice, such interaction has been overlooked. This study looks at the range of local displacement demands in shear -type frames with and without infill panels. Generic frames are developed by tuning the story stiffness and mass to produce a reasonable period range between 0.2 and 2.0 s. The masonry infill panels are simulated through equivalent diagonal struts. A Bouc-Wen-based hysteretic model is applied to incorporate the post -yielding hysteresis degradations of both columns and masonry panels. The hysteresis loop control parameter values are also given for incorporating masonry infill properties. The correlation analysis between the strength and stiffness of RC frames and masonry infills is supplied as an instrument for calibrating the hysteretic model. In the collection of records, there are a lot of near -fault ground motions, which puts a lot of seismic demands on the buildings. The modification factors via regression analysis are proposed using over 1254 nonlinear response history analyses. This modification factor is figured out by looking at the difference between the mean drift spectrum for a set of generic frames that are both bare and filled. The nonlinear analysis shows that residual drift demands can be reduced in the case of panel effects that exist for masonry-infilled mid -rise RC shear -type frames.
Binalarda ve binaların yapım aşamasında kullanılan diğer malzemelerin inşaat şantiyelerinde çalışan işçilerin sağlığı üzerindeki etkileri
(İstanbul Esenyurt Üniversitesi, 2019)
Şantiyelerde her yıl farklı iş kazaları meydana gelmektedir. Yapılan araştırmalara göre yaklaşık olarak şantiyelerde meydana gelen iş kazaları nedeniyle 500' e yakın işçi hayatını kaybetmektedir. Öte yandan gerçek rakamlar çok daha fazla olmakla beraber kayıt altına alınamayan ölümlü iş kazalarının olduğu da bilinen acı bir gerçektir. Şantiyelerin planlanma, kurulum, çalışma ve tamamlanma aşamalarına kadar işçilerin can güvenliğini sağlayan temel ilkelerin yer aldığı İş Sağlığı ve Güvenliği dünya standartlarına uygun olarak düşünülmesi ve yer alması gereken bir olgudur. Dünya genelinde İş Sağlığı ve Yönetim Sistemleri Şartlarını ve uygulamalarını kapsayan OHSAS 18001 ve 18002 gibi standartlar iş sağlığı ve güvenliğinin net ve uygulanabilir olmasını sağlamıştır. Bu standartlar Türk Standartları Enstitüsü tarafından da dilimize çevrilmiştir. Bu standartlar risk, riskin büyüklüğü, elimine edilebilirliliği, tahammül edilebilirliliği gibi durumlar için alınması gereken önlem ve çalışmaları kapsamaktadır. Risk değerlendirmesi yapılması ve şantiyelerin özellikle bu kapsamda çok tehlikeli iş yerleri olması nedeniyle yer alması gerektiği hususu belirtilmiştir. Şantiyelerde meydana gelebilecek farklı iş kazalarının önlenmesi ve en aza indirgenmesi tehlikelere karşı tedbir alınması bu standartların uygulanması ile mümkün olacaktır.
Evaluation of extractability of 2,4,6-trinitrophenol by secondary amine extractant in alcohols: Equilibrium and molecular dynamic study
(Elsevier, 2017)
Extractive separation of 2,4,6-trinitrophenol (picric acid, PAH) from its aqueous solutions was examined at constant temperature of 298.2 K. The experiments were studied on the extraction of PAH (0.061 mol kg(-1)) by Amberlite LA2, a secondary amine diluted in five different alcohols such as isopropyl alcohol, isoamyl alcohol, hexanol, heptanol, and decanol. In addition to reactive extraction, experiments on physical extraction were also performed by pure diluents. Experimental results obtained from batch extraction were evaluated in terms of distribution coefficients (K-D), extraction efficiency (E), and loading factors (Z). The highest synergistic effect was achieved with isopropyl alcohol in LA-2 at a concentration of 0.588 mol kg(-1) as 98.36%. The highest value of probable equilibrium constants for the complex between acid and amine (1:1), K-11 was calculated to be 11.62 for isopropyl alcohol at 0.588 mol kg(-1) LA-2 concentration. Kinetic and potential energies of components during reactive extraction in the organic phase have been determined by molecular dynamic modeling for picric acid + isopropyl alcohol + secondary amine. The values of energy, per atom, for mixture picric acid + isopropyl + secondary amine were respectively: similar to 30,000 kcal/mol, similar to 15,000 kcal/mol, similar to-50,000 kcal/mol and similar to-60,000 kcal/mol. (C) 2016 Elsevier B.V. All rights reserved.
Constitutive Model and Mechanical Properties of Grade 8.8 and 10.9 High-Strength Bolts at Elevated Temperatures
(Asce-Amer Soc Civil Engineers, 2024)
This paper presents an experimental study on the determination of the mechanical behaviors of Grade 8.8 and 10.9 high-strength bolts at elevated temperatures. Strength reduction coefficients are obtained based on test results at temperatures ranging from 20 degrees C to 900 degrees C, for both yield and ultimate stresses. Simplified expressions are presented to identify the strength reduction factors at considered temperatures. At 400 degrees C, the yield and ultimate strengths of bolts decrease by 30%-35% for both grades compared to those in ambient temperature. Yield strengths are 30% and 20% of yield strengths of Grade 8.8 and 10.9 bolts at ambient temperature, respectively, when the temperature exceeds 500 degrees C. The ultimate strength decreases slightly slower than the yield strength at high temperatures. Although the decrease in ultimate strength follows the decrease in yield strength at elevated temperatures, it is slightly slower. About 3%-6% of yield and ultimate strengths at ambient temperature remain for both grades at 700 degrees C. Moreover, a series of expressions are provided to obtain the full range stress-strain curve of high-strength bolts at elevated temperatures. Comprehensive literature studies are taken into consideration to propose a more generalized description of the stress-strain curves. The proposed model can be fully drawn by only using elastic modulus, yield, and ultimate stresses at ambient temperature. It is shown that the proposed model has enough efficiency to describe the general material behavior at elevated temperatures.
