69 research outputs found
Three-dimensional scanning with dual-source computed tomography in patients with acute skeletal trauma
No full textOBJECTIVE: The aim of this study was to compare the efficiency of multiplanar reformatted images and threedimensional images created after multidetector computed tomography examination in detecting acute posttraumatic osseous pathology of the skeletal system. METHOD: Between October 2006 and December 2008, 105 patients with a history of acute trauma were referred to our service. Patients were evaluated with multidetector computed tomography using multiplanary reconstructed images initially (R-I), and six months after this initial evaluation, three-dimensional images were assessed of each patient (R-II). Axial images were used for guiding as a reference Data obtained was recorded and graded according to importance levels of the pathologies. RESULTS: The R-II score was higher in the non-articular and highest in periartricular fractures of the extremities, and thoracic and pelvic cage injuries. For the spinal column, while R-I data was more significant In patients referred with polytrauma, R-II data, was more statistically significant, for short processing and adaptation time to acquiring immediate critical information. For all cases it was seen that three dimensional scans were more efficient in providing the orientation, within a short time. CONCLUSION: By dual source multidedector tomography systems trauma patients may be evaluated by multiplanary and three dimensionally reconstructed images. When used correctly, three dimensional imaging is advantageous and can help determine the exact nature and extension and also importance of osseous injuries
Bilateral persistence of type 1 proatlantal arteries: Report of a case and review of the literature
No full textPersistent proatlantal artery type 1 is one of the four anastomotic vessels between the carotid and vertebrobasilar arterial systems. Persistence of this embryonic anastomosis is extremely rare. We present such a case with bilateral persistent proatlantal arteries that arose from internal carotid arteries, entered the skull via the foramen magnum and united with the horizontal portions of vertebral arteries. We also mention its embryology, potential clinical implications, and differentiating features between two types of proatlantal arteries. © American Society of Neuroradiology
Synthesis of Mn-doped ZnS thin films by chemical bath deposition: Optical properties in the visible region
No full text2nd International Conference on Advances in Natural and Applied Sciences (ICANAS) -- APR 18-21, 2017 -- Antalya, TURKEYTransparent ZnS: Mn thin films were produced by chemical bath deposition (CBD) technique at 80 degrees C for 4h, 6h and 8h durations. The optical properties such as optical transmittance (T %), reflectance (R %), extinction coefficient (k) and refractive index (n) were deeply investigated in terms of contribution ratio, wavelength and film thickness. The optical properties of ZnS: Mn thin films were determined by UV/vis spectrophotometer transmittance measurements in the range of lambda= 300-1100 nm. Optical transmittances of the films were found from 12% to 92% in the visible region. The refractive index (n) values for visible region were calculated as 1.34-5.09. However, film thicknesses were calculated between 50 and 901 nm by gravimetric analysis.Agri Ibrahim Cecen Univ,IC FdnCukurova University [FEF2012D9]This work was supported by Cukurova University under FEF2012D9 project number
Investigation of the relationship between radon anomalıes in deep water resources near Akşehir fault zone and the radial distances of the sources to an earthquake center
No full text33rd International Physics Congress of the Turkish-Physical-Society (TPS) -- SEP 06-10, 2017 -- Bodrum, TURKEYRadon emanation occurs all the rocks and earth containing uranium element. Anomalies in radon concentrations before earthquakes are observed in fault lines, geothermal sources, uranium deposits, volcanic movements. The aim of this study is to investigate the relationship between the radon anomalies in water resources and the radial distances of the sources to the earthquake center. For this purpose, radon concentrations of 9 different deep water sources near Aksehir fault line were determined by taking samples with monthly periods for two years. The relationship between the radon anomalies and the radial distances of the sources to the earthquake center was obtained for the sources.Afyon Kocatepe University Science Research Projects Coordination Unit [12.Tematik.12]Turkish Phys SocThis work is supported by Afyon Kocatepe University Science Research Projects Coordination Unit with the grant number 12.Tematik.12
RETRACTED: Investigating the Factors Affecting Information and Communication Technology (ICT) Usage of Turkish Students in PISA 2009
No full textThis article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Author.The article is a duplicate of a paper that has already been published in TOJET: The Turkish Online Journal of Educational Technology, volume 12 (2013) 102 - 107. http://www.tojet.net/articles/v10i3/10315.pdf. One of the conditions of submission of a paper for publication is that that the paper is not under consideration for publication elsewhere. As such the author requested this article was not included in this set of published proceedings but an error meant that this was not undertaken. Apologies are offered to readers of this publication that this was not detected during the review process
Retraction notice to “Investigating the Factors Affecting Information and Communication Technology (ICT) Usage of Turkish Students in PISA 2009”
No full textThis article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Author.The article is a duplicate of a paper that has already been published in TOJET: The Turkish Online Journal of Educational Technology, volume 12 (2013) 102 - 107. http://www.tojet.net/articles/v10i3/10315.pdf. One of the conditions of submission of a paper for publication is that that the paper is not under consideration for publication elsewhere. As such the author requested this article was not included in this set of published proceedings but an error meant that this was not undertaken. Apologies are offered to readers of this publication that this was not detected during the review process
Effects of zeolite, gypsum and sulfuric acid applications on ammonia volatilization from chicken fresh manure
No full textVolatile ammonia, which emanate from chicken fresh manure significantly contributes to the atmospheric nitrogen pollution, adversely poultry performance and decreasing of manure's fertilizer value. Nowadays, the proliferation of organic wastes is attributed to the scaling up of poultry farms, and these organic wastes generate a plethora of ammonia losses, which in turn jeopardize atmospheric quality. These organic residues with regard to their use as nutrient source and soil conditioners in agricultural areas is considered one of their recycling ways and their fertility value is contingent on the extent of plant nutrients which lies in organic fertilizers obtained from these organic wastes. Therefore, the aim of this study was to investigate the effects of zeolite, sulfuric acid and gypsum applications on nitrogen losses as ammonia gas (NH3) from chicken fresh manure. The experiment was carried out in a closed system under laboratory condition whereby two different concentrations (1 and 2%) of zeolite, gypsum and sulfuric acid were separately applied to 250g of chicken fresh manure based on oven dry weight. The prepared samples were left to the incubation for 6 days and then daily and total nitrogen losses as NH3 were measured by vacuuming at certain intervals. The experimental results showed that the addition of zeolite, gypsum and sulfuric acid at the rate of 1% substantially decreased the nitrogen losses in gas form by 32%, 53.31% and 52.29% respectively, while the application of zeolite, gypsum and sulfuric acid at the rate of 2% significantly reduced losses by 54.23%, 58.87% and 62.09% respectively.Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of SelcukThe author would like to thanks Prof. Dr. Cevdet Seker and Phd student Noel Manirakiza for his helpful comments and Hamza Negis for his helpful laboratory analysis, which were conducted under the auspices of the Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of Selcuk
Instructional Leadership in Turkish Primary Schools: An Analysis of Teachers' Perceptions and Current Policy
No full textSchool leadership, one of the most important aspects of school improvement, has not received much attention from either policymakers or researchers in Turkey despite many countries embrace creating and developing effective leaders as one of the important first steps to improve their education. This research looked at the instructional leadership skills of Turkish principals from the teacher's perspective measured through a survey collected from primary school teachers in five different cities in Turkey, first, to describe the current situation and, second, to find out if teachers' experience and gender affect their views. The results show that Turkish principals practice their instructional leadership roles only occasionally and teachers' gender significantly affects their perception. © The Author(s) 2013
Implementation of a Testbed with SDN-enabled Communication Networks to Experiment on Physical Function Virtualization that Disrupts Reconnaissance of Cyber-Physical Infrastructures
No full textIndustrial control systems (ICSs) have been extensively deployed in the real world. Large ICSs, such as smart power grids, consist of the supervisory control and data acquisition (SCADA) systems and the programmable logic controllers (PLCs). PLCs and SCADA exchange control signals and measurement data through a communication network. As an ICS scales, the geographical span of the communication network increases dramatically such that it is impossible to deploy a closed local area network (LAN) to support the communication network, and the communication network has to be connected to the Internet. However, such connection introduces vulnerabilities to ICS because of the exposure of the network to sophisticated adversaries, who may be capable of causing severe physical damage to ICS after extensive reconnaissance. One intuitive defense idea is to disrupt the reconnaissance or to increase the cost of such reconnaissance.To achieve this, we propose physical function virtualization (PFV), in which we introduce a certain amount of lightweight virtual nodes. The virtual nodes are designed to follow the actual implementation of network stacks, system invariants, and physical state variations: they work just like real nodes from adversaries’ perspective.In order to measure the effectiveness of the proposed defense mechanism, we implemented PFV in a testbed based on software-defined networking (SDN). We implemented ONOS network operating system, and use this testbed to measure the performance of the proposed defense mechanism. The experimental results show that PFV can accurately follow the behavior of real nodes with negligible overhead. The author of this thesis has contributed in the building of the testbed from scratch, the operation of the experiments and the analysis of experimental data. In the present thesis, I will elaborate the implementation of the testbed as well as related experiments
- …
