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Indoor and outdoor pullout tests for retrofit anchors in low strength concrete
Derya Cavunt,Yavuz S. Cavunt,AlperIlkiandNahitKumbasar 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.18 No.5
In this study, pullout capacities of post-installed deformed bars anchored in low strength concrete using different bonding materials are investigated experimentally. The experimental study was conducted under outdoor and indoor conditions; on the beams of an actual reinforced concrete building and on concrete bases constructed at Istanbul Technical University (ITU). Ready-mixed cement based anchorage mortar with modified polymers (M1), ordinary cement with modified polymer admixture (M2), and epoxy based anchorage mortar with two components (E) were used as bonding material. Furthermore, test results are compared with the predictions of current analytical models. Findings of the study showed that properly designed cement based mortars can be efficiently used for anchoring deformed bars in low quality concrete. It is important to note that the cost of cement based mortar is much lower with respect to conventional epoxy based anchorage materials.
CASE REPORT : Two Cases of Unilateral Lichen Planus Following the Lines of Blaschko
( Derya Yayla ),( Seray Kulcu Cakmak ),( Isıl Deniz Oguz ),( Muzeyyen Gonul ),( Esra Ozhamam ),( Aysel Colak ),( Ulker Gul ) 대한피부과학회 2014 Annals of Dermatology Vol.26 No.5
A 50-year-old man and 71-year-old woman presented to ourclinic with unilateral, linear, erythematous, pruritic lesions along the lines of Blaschko. On the basis of clinical andhistopathological findings, the lesions were diagnosed as lichen planus with a Blaschkoian distribution, which is a rare form of lichen planus. The patients were treated with topical corticosteroids and antihistamines. (Ann Dermatol 26(5) 636 ∼638, 2014)
Derya Kaymak,I˙brahim Gü,ndog˘mus¸,Mihriban Dalkıran,Murat Kü,ç,ü,kevciliog˘ lu,Ö,zcan Uzun 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.12
Objective The aim of this study was to compare the thickness of the retinal nerve fiber layer (RNFL) with controls in individuals with attention deficit hyperactivity disorder (ADHD) and to examine the relationship between RNFL thickness and the level of performance in disease severity and executive function tests in ADHD cases.Methods The study included 38 volunteer patients diagnosed with ADHD and 30 healthy volunteers. Adult ADHD self-report scale was used for ADHD symptom severity. Executive functions were evaluated by Digit Span Test, Verbal Fluency Test, Stroop Test, and Trail Making Test. RNFL thickness of all participants was evaluated using optical coherence tomography (OCT).Results In the comparison of RNFL values, it was found that right mean, right temporal, right temporal inferior, left mean, left nasal, and left nasal inferior quadrant values were statistically thinner in ADHD cases compared to the control group (p<0.05). There was no statistically significant correlation between the mean RNFL thickness values of the right and left eyes of ADHD cases and the symptom severity and performance levels in executive function tests.Conclusion This study is a guide in terms of being the first study investigating the relationship between RNFL thickness, symptom severity, and various neuropsychological tests in adults with ADHD.
Synthesis and characterization of hydrothermally grown potassium titanate nanowires
Derya Kapusuz,Y. Eren Kalay,박종이,Abdullah Ozturk 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.3
Potassium titanate (KT) nanowires were synthesized by a one-step hydrothermal reaction between TiO2 and aqueous KOH solution. The effects of KOH concentration and reaction time on hydrothermal formation and KT nanowire growth were investigated. The nanowire growth mechanism was elucidated using a combined study of powder X-ray diffraction, and scanning and transmission electron microscopy. The results revealed that hydrothermal growth was initiated by the formation of amorphous-like Ti-O-K sheets in anatase. Increasing hydrothermal reaction time caused the transformation of anatase to Ti-O-K sheets, from which potassium hexa-titanate (K2Ti6O13) nuclei formed and grew to establish one-dimensional morphology through preferential growth along the b-axis. It was revealed that the hydrothermal reactions followed a quite different mechanism than the well-known calcination route. Potassium tetra-titanate (K2Ti4O9) crystals formed in the amorphous region using the hexa-titanate phase as a nucleation site for heterogeneous crystallization. Increasing the KOH concentration in the solution accelerated the hydrothermal reaction rate.
Some Results on Simple-Direct-Injective Modules
Derya Keskin Tutuncu,Rachid Tribak 경북대학교 자연과학대학 수학과 2023 Kyungpook mathematical journal Vol.63 No.4
A module M is called a simple-direct-injective module if, whenever A and B are simple submodules of M with A∼=B and B is a direct summand of M, then A is a direct summand of M. Some new characterizations of these modules are proved. The structure of simple-direct-injective modules over a commutative Dedekind domain is fully determined. Also, some relevant counterexamples are indicated to show that a left simple direct-injective ring need not be right simple-direct-injective.
Effects of mechanical activation on the structure of talc
Derya K rsever 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.5
This paper presents the results of research on mechanical activation of raw talc in planetary mill. Raw talc was mechanically activated in a planetary mill for five different grinding times as 15 min, 30 min, 45 min, 60 min, 90 min. Non-activated and activated talc powders were characterized by using particle size analysis, X-Ray diffraction (XRD), scanning electron microscopy (SEM), the Fourier transform infrared spectroscopy (FTIR) and differential thermal analysis (DTA). Mechanical activation reduced the particles size, increased the specific area and affected the loss of structural water.
Isospin properties of electric dipole excitations in <sup>48</sup>Ca
Derya, V.,Savran, D.,Endres, J.,Harakeh, M.N.,Hergert, H.,Kelley, J.H.,Papakonstantinou, P.,Pietralla, N.,Ponomarev, V.Yu.,Roth, R.,Rusev, G.,Tonchev, A.P.,Tornow, W.,Wortche, H.J.,Zilges, A. North-Holland Pub. Co 2014 Physics letters: B Vol.730 No.-
Two different experimental approaches were combined to study the electric dipole strength in the doubly-magic nucleus <SUP>48</SUP>Ca below the neutron threshold. Real-photon scattering experiments using bremsstrahlung up to 9.9 MeV and nearly mono-energetic linearly polarized photons with energies between 6.6 and 9.51 MeV provided strength distribution and parities, and an (α,α<SUP>'</SUP>γ) experiment at E<SUB>α</SUB>=136MeV gave cross sections for an isoscalar probe. The unexpected difference observed in the dipole response is compared to calculations using the first-order random-phase approximation and points to an energy-dependent isospin character. A strong isoscalar state at 7.6 MeV was identified for the first time supporting a recent theoretical prediction.
Derya Ustuner,Umut Kerem Kolac,Mehmet Cengiz Ustuner,Cihan Tanrikut,Zeynep Ozdemir Koroglu,Dilek Burukoglu Donmez,Hulya Ozen,Hilmi Ozden 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.11
Hepatic fibrosis emerges upon exposure of liver to various chemicals and if not treated, it develops various diseases such as cirrhosis and cancer. Carbon tetrachloride (CCl4) is a widely used toxin in animal models to develop hepatic fibrosis. Accumulation of unfolded proteins in cells causes stress in the endoplasmic reticulum (ER) and various mechanisms are involved in the cell to reduce the damage caused by these unfolding proteins. The most well known of these is the unfolded protein response. Further, autophagy works to remove these proteins if the damage cannot be repaired and is permanent. In our study, we investigated the effects of naringenin (NRG), a flavanon abundant in citrus fruits, on ER stress and autophagy in CCl4-injured rat liver. The animals were given 0.2 mL/kg of CCl4 for 10 days and treatment group was administered 100 mg/kg of NRG for 14 days. Histopathological examination was performed to show liver damage and to determine the therapeutic properties of the active substance. Transmission electron microscopy (TEM) analysis was carried out to establish cell level damage and effect of treatment. In addition, levels of ER stress and autophagy markers of liver were measured. According to our findings, TEM demonstrated positive effect of NRG and histological examinations reported ameliorative effects. In addition, NRG reduced levels of ER stress markers and inhibited autophagy significantly compared to CCl4-treated group. As a result, NRG significantly reduced damage in hepatocytes and provided a significant amelioration.
( Derya Burcu Hazer ),( Arsal Acarbas ),( Hans Eric Rosberg ) 대한통증학회 2018 The Korean Journal of Pain Vol.31 No.2
Background: Patients with lumbar disc herniation are treated with physiotherapy/medication and some with surgery. However, even after technically successful surgery some develop a failed back syndrome with persistent pain. Our aim was to evaluate the efficacy of epiduroscopy in patients who suffer chronic low back pain and/or radicular pain with or without surgery and the gender difference in outcome. Methods: A total of 88 patients were included with a mean age of 52 years (27-82), 54 women and 34 men. 66 of them were operated previously and 22 were non-operated. They all had persistent chronic back pain and radicular pain despite of medication and physical rehabilitation. Visual Analog Scale (VAS) for pain and Oswestry Disability Index (ODI) were evaluated preoperatively, after one month, six months and one-year after the epiduroscopy. Results: All patients, and also the subgroups (gender and operated/non-operated) improved significantly in pain (VAS) and disability (ODI) at one month. A significant improvement was also seen at one year. No differences were found between men and woman at the different follow-up times. A slight worsening in VAS and ODI was noticed over time except for the non-operated group. Conclusions: Epiduroscopy helps to improve the back and leg pain due to lumbar disc herniation in the early stage. At one year an improvement still exists, and the non-operated group seems to benefit most of the procedure. (Korean J Pain 2018; 31: 109-15)