261 research outputs found
The Calculation of Mass Attenuation Coefficients of Well-Known Thermoluminescent Dosimetric Compounds at Wide Energy Range
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYThe photon mass attenuation coefficients of LC BaSO3, CaCO3 and CaSOzi thermoluminescent dosimetric compounds at 100; 300; 500; 600; 800; 1,000; 1,500; 2,000; 3,000 and 5,000 keV gamma-ray energies were calculated. For this purpose, FLUKA Monte Carlo (MC) program which is one of the well-known MC codes was used in this study. Furthermore, obtained results were analyzed by means of ROOT program. National Institute of Standards and Technology (NIST) values were also used to compare the obtained theoretical values because the mass attenuation values of the used compounds could not found in the literature. Calculated mass attenuation coefficients were highly in accordance with the NIST values. As a consequence, FLUKA was successful in calculating the mass attenuation coefficients of the most used thennoluminescent compound.Turkish Phys SocEge UniversityEge University [2014 FEN 026]The Author thanks to Dr. E. Pilicer for his help in the calculation procedure and to Dr. C. Celiktas for his precious contribution to the study. This work was supported by Scientific Research Project of Ege University under Project No. 2014 FEN 026
A familial Xp+ chromosome detected during fetal karyotyping, which is associated with short stature in four generations of a Turkish family.
No full textThe short-stature homeobox-containing gene (SHOX) on chromosome Xp22.3 was recently identified as an important determinant of the stature phenotype. Deletions of the SHOX gene, some of them due to structural chromosome abnormalities, have been described in patients with idiopathic short stature and Leri-Weill syndrome. Additionally, haploinsufficiency of SHOX is a main cause for short stature seen in patients with Turner syndrome
Leptin receptor gene Gln223Arg polymorphism is not associated with obesity and metabolic syndrome in Turkish children
No full textKomsu-Ornek Z, Demirel F, Dursun A, Ermis B, Piskin iE, Bideci A. Leptin receptor gene Gln223Arg polymorphism is not associated with obesity and metabolic syndrome in Turkish children. Turk J Pediatr 2012; 54: 20-24
Parametric Analysis of Viscoelastic Hyperboloidal Helical Rod
No full textErmis, Merve/0000-0003-0201-6586; Kutlu, Akif/0000-0001-6865-3022; Eratlı, Nihal/0000-0003-3788-9870; OMURTAG, Mehmet Hakki/0000-0003-2669-6459The objective of this study is to perform a pioneering research about a viscoelastic hyperboloidal helical rod having a standard type of distortional behavior and a Kelvin type of bulk compressibility. Field equations are based on the Timoshenko beam theory, and the exact curvatures of the hyperboloidal geometry are considered through the formulation. The numerical analysis is carried out by the mixed finite element method, considering the rotary inertia, in the Laplace space, and the results are transformed back to time space numerically using the modified Durbin's algorithm. A cantilevered hyperboloidal helical rod having solid circular, hollow circular, and thin-walled hollow circular cross sections is handled, and the rod is loaded by rectangular and triangular impulsive types of point load at the tip. Through the analysis, different values of retardation time, three different relaxation functions associated with shear modulus, and three different creep functions associated with bulk modulus are handled. Finally, a benchmark example is presented, and the influence of the loading and the material parameters on the helix geometry is discussed.Scientific and Technological Research Council of Turkey [111M308]; Research Foundation of ITU [38078]The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research is supported by the Scientific and Technological Research Council of Turkey under project no. 111M308 and Research Foundation of ITU under project no. 38078
Multi-agent Planning and Coordination for Automated Aircraft Ground Handling
No full textInspired by the vision of fully autonomous airside operations at Schiphol airport, this study aims to contribute to the short-term goal of automated aircraft ground handling. In this research, we design and evaluate a multi-agent system for planning of automated ground handling. There are two main components in the system, task allocation optimization, and multi-agent path planning. To allocate tasks to ground support equipment (GSE) vehicles, an auction mechanism inspired by temporal sequential single item (TeSSI) auction is proposed. Ground handling tasks scheduling for GSE vehicles is modeled as several single-vehicle pickup and delivery optimization problems (SPDP), and the values of the objective functions are applied to generate bids for GSE vehicle agents in the auction. Moreover, Prioritized Safe Interval Path Planning for large agents (LA-SIPP) is used to plan collision-free paths for GSE vehicle agents in the model to execute tasks. Experimental studies have shown that the system is able to perform task allocation and path planning of ground handling tasks for flights in 3 aircraft stands within a 4-hour time in a reasonable computational time. Moreover, the model is capable to replan the tasks for agents when disruption happens. Applying the lowest possible numbers of vehicles used in the current operation, the model can always reach success allocation and path planning rates higher than 81% and 98%, respectively.Aerospace Engineerin
Image and Diagnosis
No full textA seven-day-old male was brought to the neonatal intensive care unit with a history of delayed passage of meconium, vomiting and abdominal distention. He was born at term by vaginal delivery after an uncomplicated pregnancy. The fa-mily history was unremarkable.
Physical examination revealed an ill baby with abdo-minal distention. His weight was 3300g, axillary tempera-ture 37°C, heart rate 140 beats/min, respiratory rate 36/min and blood pressure 65/35 mmHg. No hepatosplenomegaly was noted. A faecal mass was palpated in the left lower abdomen, but no stool felt on rectal examination. Abdominal distension was relieved by rectal stimulation. The remainder of the physical examination was unremarkable.
Complete blood count, liver and renal function tests were within normal limits. A plain abdominal radiograph showed marked dilatation of the colon with no gas in the rectum. Barium enema photomicrograph is shown
Early cardiac abnormalities and serum N-terminal pro B-type natriuretic peptide levels in obese children
No full textObjective: The aim of this study was to evaluate early cardiac abnormalities in obese children by the conventional echocardiography and to verify whether N-terminal pro B-type natriuretic peptide (NT-proBNP) differ between obese and healthy children. Methods: We started this study with 68 obese children and 35 healthy controls matched for age and sex. Body mass index (BMI) was calculated. Children with a BMI >= 95th percentile were considered obese. Thirty children in the obese group were also diagnosed with metabolic syndrome, according to the International Diabetes Federation criteria. Standard echocardiographic study was performed on each patient and control subject. Diastolic filling parameters were evaluated using pulsed-wave tissue Doppler method. Blood samples were taken at 8 a. m. to study blood biochemistry tests, including insulin, lipids, glucose, and NT-proBNP. Serum NT-proBNP levels were measured by a solid-phase, enzyme-labeled chemiluminescent immunometric assay. Homeostasis model assessment of insulin resistance (HOMA-IR) was calculated. Children with HOMA-IR >3.16 were considered insulin-resistant. Results: There were diastolic filling abnormalities in obese children, as shown by a decreased mitral valve early filling (E) wave/late filling (A) ratio and a prolongation in E-wave deceleration time. The levels of NT-proBNP were not statistically different among the groups. The levels of NT-proBNP were not different between obese children with and without metabolic syndrome, those with and without hypertension, and those with and without insulin resistance, respectively. Conclusion: Although there were diastolic filling abnormalities in obese children, their NT-proBNP levels were not different from healthy controls. It seems that there is no diagnostic value in NT-proBNP levels between obese children and healthy control
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