Seismic behavior of liquid storage tanks with 2D and 3D base isolation systems

Samet Kılıç,Bülent Akbaş,Jay Shen,Fabrizio Paolacci 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.5

In past major earthquakes (1994 Northridge, 1995 Kobe, Chi-Chi 1999, Kocaeli 1999), significant damages occurred in the liquid storage tanks. The basic failure patterns were observed to be the buckling of the tank wall and uplift of the anchorage system. The damages in the industrial facilities and nuclear power plants have caused the spread of toxic substances to the environment and significant fires. Seismic isolation can be used in liquid storage tanks to decouple the structure and decrease the structural demand in the superstructure in case of ground shaking. Previous studies on the use of seismic isolation systems on liquid storage tanks show that an isolation system reduces the impulsive response but might slightly increase the convective one. There is still a lack of understanding of the seismic response of seismically isolated liquid storage tanks considering the fluid-structure interaction. In this study, one broad tank, one medium tank, and one slender tank are selected and designed. Two- and three-dimensional elastomeric bearings are used as seismic isolation systems. The seismic performance of the tanks is then investigated through nonlinear dynamic time-history analyses. The effectiveness of each seismic isolation system on tanks’ performance was investigated. Isolator tension forces, modal analysis results, hydrodynamic stresses, strains, sloshing heights and base shear forces of the tanks are compared. The results show that the total base shear is lower in 3D-isolators compared to 2D-isolators. Even though the tank wall stresses, and strains are slightly higher in 3D-isolators, they are more efficient to prevent the tension problem.

Buckling Behavior of Nose Cone Type Steel Tanks Including Horizontal Imperfection

Mahmut Kılıç 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4

Cylindrical shells have long been used as storage tanks in small or large sizes to store a variety of materials such as petroleum and derivatives. The radius to thickness ratios of these shells are classifi ed as 1000 and 2000 according to which designers and international codes are attracted to the buckling due to their collapse in buckling. Considerable research has been conducted on cylindrical reservoirs under the infl uence of a hydrostatic force or an internal vacuum. Due to the low wall thickness of the shell structures, it is possible to cause any deformation and disturbance on the wall surfaces. Due to a variety of errors during construction or assembly, the designed tanks are not ideally constructed and have some geometric error. Horizontal imperfection caused by continuous welding on the steel sheet’s edge to form the nose cone is the main concern of this work. The present paper attempts to discuss seven laboratory specimens under uniformed hydrostatic pressure with the 4t, 6t, 8t, 10t, 14t and 24t depths. The results revealed that there is a descent agreement between the results of the experiments conducted here and international codes and theories concerning with initial and overall buckling and collapse.

Self-Injury and Suicide Attempt in Relation with Trauma and Dissociation among Adolescents with Dissociative and Non-Dissociative Disorders

Filiz Kılıç,Murat Coşkun,Hasan Bozkurt,Ilyas Kaya,Salih Zoroǧlu 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.2

Objective: To explore the role of trauma and dissociation over self-injurious behaviors (SIB) and suicide attempts (SA) in adolescents. Methods: A total of 207 adolescents participated in the study. After conducting diagnostic interview, participants were divided into five groups as subjects with dissociative disorders (DD), attention deficit hyperactivity disorder (ADHD), major depressive disorder (MDD) and anxiety disorders (AD), and a control group (CG) without any psychiatric disorder. ADHD, MDD and AD groups were considered as non-dissociative disorders (non-DD group) in the present study. Results: There is no significant difference between groups in terms of number and age of the subjects (p>0.05). Among all participants SIB was reported in 32.2% of females (n=37) and 25% of males (n=23) while SA was reported in 29.6% of females (n=34) and 4.4% of males (n=4). Adolescents with DD were found to experience higher rates of SIB and SA than the other groups. Dissociation was the most important variable contributing to SIB and female gender was the most efficient variable for SA. Total trauma scores were also found to be significantly higher in DD group followed by non-DD and CG respectively. Conclusion: SIB and SA are complex behavioral problems which may be associated with many psychiatric factors. However higher level dissociation seems as an important mediating factor, even regardless of psychiatric diagnosis, in the development of SIB and SA. More research is needed to further explore the factors effective over SIB and SA in adolescents.

Swallowing and Aspiration: How Much Is Affected by the Number of Arytenoid Cartilages Remaining After Supracricoid Partial Laryngectomy?

Caner Kılıç,Ümit Tunçel,Metin Kaya,Ela Cömert,Samet Özlügedik 대한이비인후과학회 2017 Clinical and Experimental Otorhinolaryngology Vol.10 No.4

Objectives. The aim of this study was to compare the effect of the presence of one or two arytenoids on early/late period swallowing-aspiration functions. Methods. Supracricoid partial laryngectomy (SCPL) with the diagnosis of laryngeal cancer between 2012 and 2014 were retrospectively evaluated. The patients were categorized into two groups as follows: group I, patients who underwent SCPL with one arytenoid cartilage and group II, patients who underwent SCPL with two arytenoid cartilages. The time of decannulation and oral feeding onset, and swallowing-aspiration functions were evaluated and compared in the early nutritional period, first, and third months. Results. There was no significant correlation between decannulation time and swallowing-aspiration. The aspiration rates in group I and group II were similar and there was no significant difference in oral feeding onset and aspiration grades in the first and third months between both groups. Conclusion. We found similar oncological and functional outcomes in SCPL which protected one or two arytenoid cartilages. Therefore we suggest to be performed one arytenoid cartilage SCPL in selected patients who was advance stage and tumor volume over with larynx cancer.

Ductal Carcinoma In Situ Detected by Shear Wave Elastography within a Fibroadenoma

Fahrettin Kılıç,Fethi Emre Ustabaşıoğlu,Cesur Samancı,Ahmet Baş,Mehmet Velidedeoglu,Tülin Kılıçaslan,Fatih Aydogan,Mehmet Halit Yılmaz 한국유방암학회 2014 Journal of breast cancer Vol.17 No.2

Fibroadenoma is the most common breast tumor in women. Malignant transformation occurs rarely within fibroadenoma atolder ages. Clinicians, radiologists, and pathologists need to beaware of malignant transformation within fibroadenomas. Radiologicstudies play an important role in the diagnosis of fibroadenoma;however, radiologic findings are often nonspecific formalignancy and may appear completely benign. We detected anoccult ductal carcinoma in situ that originated inside a fibroadenomaby using shear wave elastography. We report shearwave elastography findings of ductal carcinoma in situ withinfibroadenoma and discuss the diagnostic role of this modality.

The Effect of Drug Use, Body Mass Index and Blood Pressure on Oxidative Stress Levels in Children and Adolescents with Attention Deficit and Hyperactivity Disorder

Dilşad Yıldız Miniksar(Dilşad Yıldız Miniksar ),Mehmet Akif Cansız(Mehmet Akif Cansız ),Ayşe Yeşim Göçmen(Ayşe Yeşim Göçmen ),Mahmut Kılıç(Mahmut Kılıç ),Ökkeş Hakan Miniksar(Ökkeş Hakan Miniksar ) 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1

Objective: The aim of this study was to determine the correlation between clinical variables such as body mass index, blood pressure, drug use and oxidative stress level in children and adolescents with attention deficit and hyperactivity disorder (ADHD). Methods: Total oxidant status (TOS), total antioxidant status (TAS), oxidative stress index (OSI), malondialdehyde (MDA) and superoxide dismutase (SOD) activity were measured in the serum of 51 patients (38 male, 13 female) diagnosed with ADHD according to DSM-5 diagnostic criteria and 32 control subjects (12 male, 20 female). The Kiddie Schedule for Affective Disorders and Schizophrenia Present and Lifetime Version was applied to all participants. Results: The mean TOS, OSI, MDA values were determined to be significantly higher (p < 0.001) and the mean SOD value was lower in the ADHD group (p < 0.001). Multivariate regression analysis indicated significantly lower SOD and diastolic blood pressure values and significantly higher MDA in the ADHD group compared to the control group (p < 0.01). Low SOD (sensitivity 90.2%, specificity 78.0%) and high MDA (sensitivity 86.3%, specificity 81.2%) were determined to be predictive parameters for diagnosing ADHD. In univariate analysis, the mean TOS, OSI and SOD values were higher in ADHD patients under medication, while the mean TAS was higher in patients not using medication (p < 0.01). Only TOS was significant in multivariate logistic regression analysis (p < 0.01). Conclusion: The results of this study demonstrate that impaired oxidative balance may play a role in the etiology of ADHD.

The Relationship between Second-to-Fourth Digit Ratios, Attention-Deficit/Hyperactivity Disorder Symptoms, Aggression, and Intelligence Levels in Boys with Attention-Deficit/Hyperactivity Disorder

Işık Ümit,Kılıç Faruk,Aktepe Evrim,Tanrıtanır Bilal 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.6

Objective Observations of sex differences have led some scientists to doubt whether the neuroendocrine system is involved in attentiondeficit/hyperactivity disorder (ADHD) etiology. One of the interesting study subjects in this context is prenatal steroid hormone exposure. The aim of the present study was to replicate and extend previous work by addressing two research questions: 1) Are second-tofourth digit (2D:4D) ratios lower in ADHD than in controls? 2) Is there a correlation between 2D:4D ratios and symptoms of ADHD, aggression and intelligence scores in boys with ADHD?Methods The study included 100 treatment-naive male children diagnosed with ADHD and 55 healthy male children. We measured the ratios of 2D:4D and administered a Wechsler Intelligence Scale for Children-Revised to assess IQ scores, as well as behavioral rating scales, in children with ADHD and comparison individuals.Results We observed lower 2D:4D ratios in the right hand in ADHD in comparison to the control group. The left-hand ratios of 2D:4D, however, did not differ between ADHD and control groups. There were negative correlations between the left-hand 2D:4D ratios and the hyperactivity scores. However, no significant correlation was detected between right-hand 2D:4D ratios and the psychological questionnaire scores.Conclusion These results provide further evidence that fetal androgen exposure may contribute to the pathophysiology of ADHD, at least in boys.

Bioremoval of reactive dye Remazol Navy by kefir grains

Ali Osman Erdoğdular,Dilek Kılıç Apar 한국응용생명화학회 2019 Applied Biological Chemistry (Appl Biol Chem) Vol.62 No.-

Potential use of living and non-living kefir grains (small, gelatinous white/yellow irregularly shaped masses consist of live bacteria and yeasts) on removal of reactive dye Remazol Navy RGB from aqueous solutions were investigated. Experiments were carried out under different process conditions in order to optimize and model the bioremoval processes. At all conditions the living kefir grains exhibited higher dye removal efficiencies than the non-living grains. In 180 min, 96.3% and 79.4% dye removal was obtained with living and non-leaving kefir grains respectively, at pH 2, 25 °C for 100 mg/L initial dye concentration by using 2.4 g/L kefir grain. Maximum adsorption capacities by living and inactivated kefir grains were obtained at 400 mg/L initial dye concentration as 134.59 and 56.92 mg/g respectively. Consecutive batch studies show that the living kefir grains could be reused over at least 5 cycles with high dye removal efficiency without any nutrition supplement. The biosorption kinetics both for living and non-living kefir grains were best described with pseudo-first-order kinetic model. On the other hand the biosorption equilibrium for living and non-living kefir grains were better defined by Temkin and Langmuir isotherm models respectively. Results suggest that the kefir grains could be used efficiently, eco-friendly and economically for removal of dyes from aqueous solutions.

Peripartum Cardiomyopathy, Hemolysis, Elevated Liver Enzymes, Low Platelet Values Syndrome, and an Incidental Atrial Septal Defect in a Multiparous Woman

Onur Furkan Akgün,Erhan Kılıç,Yavuzer Koza,Hakan Tas 아시아심장혈관영상의학회 2023 Cardiovascular Imaging Asia Vol.7 No.2

Peripartum cardiomyopathy (PPCM) and hemolysis, elevated liver enzymes, low platelet values (HELLP) syndrome are rare conditions with unknown etiologies and are associated with increased maternal and perinatal morbidity and mortality. However, survival chances can be increased and full recovery may be achieved in patients who receive an early diagnosis and treatment. We report the clinical follow-up of a multiparous woman who developed HELLP syndrome on the second day of the postpartum period and PPCM on the 40th day and was found to have an incidental secundum-type atrial septal defect.

On the spectrum and fine spectrum of the upper triangular double band matrix U(a_0, a_1, a_2; b_0, b_1, b_2) over the sequence space l_p

Nuh Durna,Rabia Kılıç 호남수학회 2023 호남수학학술지 Vol.45 No.4

The purpose of this article is to obtain the spectrum, fine spectrum, approximate point spectrum, defect spectrum and compression spectrum of the double band matrix U(a_0, a_1, a_2; b_0, b_1, b_2), b_0, b_1, b_2 ̸= 0 on the sequence space ℓ_p (1 < p < ∞).