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- 저자 : Erkal, Aslı (검색결과 4 건)
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Erkal, Aslı,Erdoğ,an, Mehmet Selç,uk,Aş,ık, İ,hsan,Ekş,i, Haslet,Jeon, Seungwon,Solak, Ali Osman,Ü,stü,ndağ,, Zafer The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.10
<P>A new electrode was prepared by the electrooxidation of orto-, meta-, and para-substituted nitro phenols on glassy carbon electrode. Electrochemical modification of the electrodes was carried out in 0.01 M HCl using cyclic voltammetry (CV). Then nitro groups in the covalently grafted nitro phenol derivatives on GC electrode were reduced to amine groups in 0.01 M HCl. The electrochemical behavior of the modified electrodes was studied in the presence of electroactive redox probes such as ferrocene and ferricyanide by CV and electrochemical impedance spectroscopy (EIS). X-ray photoelectron spectroscopy (XPS) was employed to characterize the surface structure and composition of the modified substrates. Thickness of the films was measured by using an ellipsometer. Surface topography of the nanofilms and bare GC was characterized via AFM. Graphene oxide (GO) was covalently attached on 4-aminophenyl involved surface through EDC. Simple immersing of the GO covered nanoplatform into a sample solution led to the chemical deposition by means of the interaction with Cd<SUP>2+</SUP> and Pb<SUP>2+</SUP> ions, simultaneously. Various analysis parameters that affect the simultaneous analysis of the ions such as deposition time, pH factor and deposition temperature, were optimized. Calibration curve for the GO grafted electrode surface with Square-wave anodic stripping voltammetry (SWASV) were obtained in the concentration range between 1 × 10<SUP>−8</SUP> M and 1 × 10<SUP>−12</SUP> M for Pb<SUP>2+</SUP> and Cd<SUP>2+</SUP>. The detection limits of the modified electrode for Pb<SUP>2+</SUP> and Cd<SUP>2+</SUP> ions were determined to be about 3.2 (± 0.1) × 10<SUP>−13</SUP> M and 2.4 (± 0.2) × 10<SUP>−13</SUP> M, respectively.</P>
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Automated Geometric Imperfection Detection and Quantification of CFS Members from Point Clouds
Burcu Güldür Erkal,Özge Gizem Çağrıcı 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.9
Cold-formed steel (CFS) has become widely used as a construction material in the last decade. Many studies have been performed to investigate the behaviour of CFS members as individual structural components. The results obtained from these studies showed that CFS members' behaviour under certain loading cases is significantly affected by the geometric imperfections present on these members. To fully understand an individual CFS member's behaviour, the effects of geometric imperfection should be taken into account. However, locating and quantifying these geometric imperfections on any CFS member is not straightforward. In this research, geometric imperfections are- detected automatically using a novel methodology. This method relies on the usage of a three-dimensional optical scanner for collecting texture-mapped point clouds of various C- and omega-sectioned CFS members. CFS members' local and global geometric imperfections are then extracted from the captured texture-mapped point clouds. The obtained results are then compared with the literature. It is observed that the geometric imperfection distributions at both local and global levels on CFS members differ significantly along each member. This differentiation is observed even for the identically dimensioned members manufactured in succession using the same machine.
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INDEPENDENT TRANSVERSAL DOMINATION NUMBER IN COMPLEMENTARY PRISMS
( Aysun Aytaç ),( Cem Erkal ) 호남수학회 2021 호남수학학술지 Vol.43 No.1
A set D ⊆ (G) is an independent transversal dominating set of G if D is a dominating set and also intersects every maximum independent set in G. The minimum cardinality of such a set is equal to the transversal domination number, denoted by □it(G). This paper is devoted to the computation of the independent transversal domination number of some complementary prism.
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Ş,enay Kılınç,el,Feray Tarımtay Altun,Ö,zgecan Nuryü,z,Ezgi Tan,Erkal Erzincan,Oğ,uzhan Kılınç,el,Esra Yazıcı,Muhammed Ayaz 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.2
Objective The COVID-19 outbreak has negatively affected children in many ways. This study aimed to compare the psychological responses of children exposed to different levels of stress during the COVID-19 outbreak. Methods The anxiety levels, negative thoughts, and quality of life of COVID-19-positive children with COVID-19-positive parents (Child+ group, n=17), COVID-19-negative children who are separated from COVID-19-positive parents (Parent+ group, n=59), and a control group (n=64) were compared. The participants completed the Screen for Child Anxiety and Related Disorders (SCARED), Children’s Negative Cognitive Errors Questionnaire (CNCEQ), and Pediatric Quality of Life Inventory (PedsQL). Results The statistical analysis revealed that the Parent+ group recorded higher SCARED and CNCEQ scores and lower PedsQL scores in comparison with the control group. No statistically significant difference was found between the scores of the Child+ and control groups. Furthermore, high CNCEQ scores and low PedsQL scores in the Parent+ group predicted an increase in their SCARED scores. Conclusion Our study indicates that separating children from their parents during the COVID-19 outbreak negatively influences their mental health and increases their anxiety levels.
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