Propagation of Axial Symmetric, Transient Waves from a Cylindrical Cavity

N. Kadioglu,S. Ataoglu 대한토목학회 2010 KSCE JOURNAL OF CIVIL ENGINEERING Vol.14 No.4

The aim is to determine the displacement and the stress fields for a cylindrical cavity under a transient pressure which is an arbitrary function of time. A fundamental solution, given by Kadioglu and Ataoglu, has been revised to be used in reciprocal theorem for the solutions of axially symmetric transient problems of elastodynamics. An integral equation, whose unknown is the radial displacement on the boundary, has been written, using this fundamental solution in reciprocal identity. The boundary values of two sample problems, have been determined by solving this integral equation. To calculate the propagation of the displacement field in the region for any axially symmetric problem, a second elastodynamic state has also been derived. This new elastodynamic state has been used in reciprocity theorem to compute the time-variations of the displacement and the stresses at any point in the region for both sample problems. Whole singularities arising in every stage of the formulation have been eliminated. The most interesting result of the presented solution is the representation of a propagating wave by two different two-dimensional integrals at any interior point. Each of these integrals is valid for a different time interval and these intervals are defined by the position of the mentioned interior point.

The mixed finite element for quasi-static and dynamic analysis of viscoelastic circular beams

Kadioglu, Fethi,Akoz, A. Yalcin Techno-Press 2003 Structural Engineering and Mechanics, An Int'l Jou Vol.15 No.6

The quasi-static and dynamic responses of a linear viscoelastic circular beam on Winkler foundation are studied numerically by using the mixed finite element method in transformed Laplace-Carson space. This element VCR12 has 12 independent variables. The solution is obtained in transformed space and Schapery, Dubner, Durbin and Maximum Degree of Precision (MDOP) transform techniques are employed for numerical inversion. The performance of the method is presented by several quasi-static and dynamic example problems.

Reliability and Validity of the Turkish Version of Children’s Somatization Inventory

Kadioglu Hasibe,Sisman Fatma Nevin,Ergun Ayse 한국간호과학회 2012 Asian Nursing Research Vol.6 No.1

Purpose: The purpose of this study was to examine the psychometric properties of the Children’s Somatization Inventory (CSI) in Turkish schoolchildren and adolescents. Methods: The CSI was translated using translation and back-translation. The participants were 813schoolchildren, adolescents and their parents (n ¼ 453). Content and construct validity were assessed to test the validity of the CSI-24. Internal consistency reliability, interrater reliability (child-parent agreement)and test-retest reliability were assessed to test the reliability of the CSI-24. Results: Psychometric analyses of the Turkish version of the CSI-24 indicate high reliability and good content and construct validity. Conclusion: The Turkish version of the CSI-24 is a useful instrument for measuring self-reported somatic complaints in Turkish schoolchildren and adolescents between the ages of 9 and 15 Purpose: The purpose of this study was to examine the psychometric properties of the Children’s Somatization Inventory (CSI) in Turkish schoolchildren and adolescents. Methods: The CSI was translated using translation and back-translation. The participants were 813schoolchildren, adolescents and their parents (n ¼ 453). Content and construct validity were assessed to test the validity of the CSI-24. Internal consistency reliability, interrater reliability (child-parent agreement)and test-retest reliability were assessed to test the reliability of the CSI-24. Results: Psychometric analyses of the Turkish version of the CSI-24 indicate high reliability and good content and construct validity. Conclusion: The Turkish version of the CSI-24 is a useful instrument for measuring self-reported somatic complaints in Turkish schoolchildren and adolescents between the ages of 9 and 15

A BEM implementation for 2D problems in plane orthotropic elasticity

Kadioglu, N.,Ataoglu, S. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.5

An improvement is introduced to solve the plane problems of linear elasticity by reciprocal theorem for orthotropic materials. This method gives an integral equation with complex kernels which will be solved numerically. An artificial boundary is defined to eliminate the singularities and also an algorithm is introduced to calculate multi-valued complex functions which belonged to the kernels of the integral equation. The chosen sample problem is a plate, having a circular or elliptical hole, stretched by the forces parallel to one of the principal directions of the material. Results are compatible with the solutions given by Lekhnitskii for an infinite plane. Five different orthotropic materials are considered. Stress distributions have been calculated inside and on the boundary. There is no boundary layer effect. For comparison, some sample problems are also solved by finite element method and to check the accuracy of the presented method, two sample problems are also solved for infinite plate.

Size effect in flexural behaviour of unidirectional GFRP composites

Murat Demiral,Ferhat Kadioglu,Vadim V. Silberschmidt 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.12

In this paper, the size effect in unidirectional (UD) laminated glass-fibre reinforced plastic (GFRP) composites subjected to quasi-static bending loading was investigated: the sensitivity of a specimen’s mechanical behaviour and failure mechanism to its geometry was studied. Composite beams with different numbers of 0° unidirectional plies were tested and their post-deformation structures were analysed microscopically. In the subsequent simulations, the intraply damage was modelled using continuum damage mechanics, implemented as a user-defined VUMAT subroutine in ABAQUS/Explicit, while cohesive zone elements were employed to characterize the delamination between different plies. It was observed that the flexural failure triggered the multiple delaminations; their location was studied. The influence of the size effect on the bending response of the UD composite beams was analysed in depth. The findings of the current study can be used to design modern structures made of composite materials.

Absolute effective elastic constants of composite materials

Osman Bulut,Necla Kadioglu,Senol Ataoglu 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.57 No.5

The objective is to determine the mechanical properties of the composites formed in two types, theoretically. The first composite includes micro-particles in a matrix while the second involves long, thin fibers. A fictitious, homogeneous, linear-elastic and isotropic single material named as effective material is considered during calculation which is based on the equality of the strain energies of the composite and effective material under the same loading conditions. The procedure is carried out with volume integrals considering a unique strain energy in a body. Particularly, the effective elastic shear modulus has been calculated exactly for small-particle composites by the same procedure in order to determine of bulk modulus thereof. Additionally, the transverse shear modulus of fiber reinforced composites has been obtained through a simple approach leading to the practical equation. The results have been compared not only with the outcomes in the literature obtained by different method but also with those of finite element analysis performed in this study.

Investigation of human papillomavirus prevalence in married women and molecular characterization and phylogenetic analysis of the virus

Ayse Erdem Yayla,Berrin Goktug Kadioglu,Ayse Aydin,Osman Aktas 대한산부인과학회 2019 Obstetrics & Gynecology Science Vol.62 No.4

ObjectiveHuman papillomaviruses (HPVs) are among the agents responsible for infection and cancer of the skin and mucousmembranes in the human body. The aim of this study was to investigate the frequency and type distribution of HPVsin married female patients with gynecological complaints, who had visited the Maternity Hospital in Erzurum, Turkey. MethodsIn this study, 263 cervical swab samples were taken from married women using the Pap smear method and wereinvestigated for positive reactivity against HPV. The L1 gene region of HPV was investigated using molecular methods. For this purpose, polymerase chain reaction (PCR) assays and sequence analysis of positive samples were performed. Phylogenetic analyses were performed using a bioinformatics approach after sequencing. ResultsHPV-DNA was detected in 17 (6.5%) samples. Highest positive reactivity to HPV-DNA was found in the 35–44 agegroup at 9.2%. Fourteen out of seventeen positive samples were included in the phylogenetic analysis. All isolatesclustered in the Alphapapillomavirus genus. Six samples were found to be HPV 70 positive, four were HPV 16 positive,and the rest were HPV 54, 72, 81, and 114 positive. When genotyping data were evaluated according to the riskgroup, we found that 28.6% of the 14 samples were found to be high risk-HPV, and 71.4% were low risk-HPV. ConclusionAs per our knowledge, this is the first report on the phylogenetic analysis of HPV genotypes isolated from women inTurkey. The prevalence of low- and-high risk HPV was determined in married women in Erzurum, and these resultscontribute to the epidemiological data on the distribution of HPV types for this region.

Evaluation of prolonged pain in preterm infants with pneumothorax using heart rate variability analysis and EDIN (Échelle Douleur Inconfort Nouveau-Né, neonatal pain and discomfort scale) scores

Buyuktiryaki, Mehmet,Uras, Nurdan,Okur, Nilufer,Oncel, Mehmet Yekta,Simsek, Gulsum Kadioglu,Isik, Sehribanu Ozluer,Oguz, Serife Suna The Korean Pediatric Society 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.10

Purpose: The EDIN scale (${\acute{E}}chelle$ Douleur Inconfort Nouveau-$N{\acute{e}}$, neonatal pain and discomfort scale) and heart rate variability has been used for the evaluation of prolonged pain. The aim of our study was to assess the value of the newborn infant parasympathetic evaluation (NIPE) index and EDIN scale for the evaluation of prolonged pain in preterm infants with chest tube placement due to pneumothorax. Methods: This prospective observational study assessed prolonged pain in preterm infants with a gestational age between 33 and 35 weeks undergoing installation of chest tubes. Prolonged pain was assessed using the EDIN scale and NIPE index. Results: There was a significant correlation between the EDIN scale and NIPE index (r=-0.590, P=0.003). Prolonged pain is significantly more severe in the first 6 hours following chest tube installation (NIPE index: 60 [50-86] vs. 68 [45-89], P<0.002; EDIN score: 8 [7-11] vs. 6 [4-8], P<0.001). Conclusion: Prolonged pain can be accurately assessed with the EDIN scale and NIPE index. However, evaluation with the EDIN scale is time-consuming. The NIPE index can provide instantaneous assessment of prolonged and continuous pain.

Evaluation of prolonged pain in preterm infants with pneumothorax using heart rate variability analysis and EDIN (Échelle Douleur Inconfort Nouveau-Né, neonatal pain and discomfort scale) scores

Mehmet Buyuktiryaki,Nurdan Uras,Nilufer Okur,Mehmet Yekta Oncel,Gulsum Kadioglu Simsek,Sehribanu Ozluer Isik,Serife Suna Oguz 대한소아청소년과학회 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.10

Purpose: The EDIN scale (Échelle Douleur Inconfort Nouveau-Né, neonatal pain and discomfort scale) and heart rate variability has been used for the evaluation of prolonged pain. The aim of our study was to assess the value of the newborn infant parasympathetic evaluation (NIPE) index and EDIN scale for the evaluation of prolonged pain in preterm infants with chest tube placement due to pneumothorax. Methods: This prospective observational study assessed prolonged pain in preterm infants with a gestational age between 33 and 35 weeks undergoing installation of chest tubes. Prolonged pain was assessed using the EDIN scale and NIPE index. Results: There was a significant correlation between the EDIN scale and NIPE index (r=-0.590, P= 0.003). Prolonged pain is significantly more severe in the first 6 hours following chest tube installation (NIPE index: 60 [50–86] vs. 68 [45–89], P<0.002; EDIN score: 8 [7–11] vs. 6 [4–8], P<0.001). Conclusion: Prolonged pain can be accurately assessed with the EDIN scale and NIPE index. However, evaluation with the EDIN scale is time-consuming. The NIPE index can provide instantaneous assessment of prolonged and continuous pain.

Hydrogen Peroxide Extends Postharvest Life of Ctenanthe setosa Leaf Cuts under Osmotic Stress by Reducing Leaf Rolling

Aykut Saglam,Ebru Kalaycioglu,Funda Gul Guven,Neslihan Saruhan,Asım Kadioglu,Mehmet Demiralay 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.4

Reducing effects of exogenous hydrogen peroxide on leaf rolling in detached leaves of Ctenanthe setosawere studied. The leaves were kept in H2O2 solutions ranging from 0 to 1 mM for 48 h and then, osmotic stresswas applied for 4 h by polyethylene glycol (PEG). Degree of leaf rolling, loss of leaf water, and malondialdehyde(MDA) content were reduced by 0.2 mM H2O2. Antioxidant enzymes were induced by 0.2 mM H2O2. EndogenousH2O2 content was increased after the 0.5 and 1 mM H2O2 treatments but was decreased after 0.2 mM H2O2 treatment. Proline was decreased after exogenous H2O2 applications. Total soluble sugar content was increased as compared tothe control after 0.2 mM H2O2 treatment. In conclusion, low-dose exogenous H2O2 treatment could delay leaf rollingby inducing tolerance to osmotic stress due to modulation of the antioxidant system, soluble sugar accumulation, andmaintenance of leaf hydration. Therefore, postharvest life of C. setosa cut foliage could be extended by 0.2 mMH2O2 treatments.