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Lee, Jongyeol,Makineci, Ender,Tolunay, Doğ,anay,Son, Yowhan Elsevier 2018 The Science of the total environment Vol.640 No.-
<P><B>Abstract</B></P> <P>A significant area of the oak forests in Turkey has been historically managed by short-rotation coppicing for wood production. Coppice management was almost abandoned in Turkey in 2006 and so investigating its impact on forest carbon (C) sequestration has become an important issue. Therefore, we investigated the net effect of this change in management on C sequestration by oak forests in Turkey using field measurement data and a forest C model (Forest Biomass and Dead organic matter Carbon (FBDC) model). The FBDC model estimated the annual forest C dynamics and considered the effect of the substitution of wood for fossil fuels under two management scenarios over a 100-year period: (1) abandoning coppice (no management) and (2) continuing coppice (20-year-interval harvest). The field measurement data were used to parameterize the FBDC model to the study sites and to verify the simulated C stocks. Continuing coppice management constrained an increase in the C stocks (116.0–140.3 Mg C ha<SUP>−1</SUP>) and showed a mean annual C sequestration of 0.6 Mg C ha<SUP>−1</SUP> yr<SUP>−1</SUP> if wood was substituted for fossil fuels. In contrast, abandoning coppicing practices increased the level of forest C stocks (128.1–236.2 Mg C ha<SUP>−1</SUP>), enhancing the mean annual C sequestration to 1.1 Mg C ha<SUP>−1</SUP> yr<SUP>−1</SUP>. Accordingly, the abandonment of coppice management increased the mean annual C sequestration by 0.5 Mg C ha<SUP>−1</SUP> yr<SUP>−1</SUP> in the long-term. However, sensitivity analysis showed a possibility of a larger difference in C sequestration between the two scenarios due to a decrease in the stand productivity by repeated coppices and a high likelihood of a lower substitution effect. The verification supported the scientific reliability of the simulation results. Our study can provide a scientific basis for enhancing C sequestration in coppice forests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Abandoning coppice in Turkey is expected to affect carbon (C) sequestration. </LI> <LI> C sequestration was estimated under abandoning and continuing coppice scenarios. </LI> <LI> Forest carbon model and field measurement data were combined. </LI> <LI> Abandoning and continuing coppice sequestered 1.1 and 0.6 Mg C ha<SUP>−1</SUP> yr<SUP>−1</SUP>. </LI> <LI> The abandonment of coppice would enhance the C sequestration in the long-term. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Acoustic emission technique to identify stress corrosion cracking damage
V. Soltangharaei,J.W. Hill,Li Ai,R. Anay,B. Greer,M. Bayat,P. Ziehl 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.6
In this paper, acoustic emission (AE) and pattern recognition are utilized to identify the AE signal signatures caused by propagation of stress corrosion cracking (SCC) in a 304 stainless steel plate. The surface of the plate is under almost uniform tensile stress at a notch. A corrosive environment is provided by exposing the notch to a solution of 1% Potassium Tetrathionate by weight. The Global b-value indicated an occurrence of the first visible crack and damage stages during the SCC. Furthermore, a method based on linear regression has been developed for damage identification using AE data.
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Vibration analysis of a Timoshenko beam carrying 3D tip mass by using differential transform method
Hilal Doğanay Katı,Hakan Gökdağ 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4
Dynamic behaviour of beam carrying masses has attracted attention of many researchers and engineers. Many studies on the analytical solution of beam with concentric tip mass have been published. However, there are limited works on vibration analysis of beam with an eccentric three dimensional object. In this case, bending and torsional deformations of beam are coupled due to the boundary conditions. Analytical solution of equations of motion of the system is complicated and lengthy. Therefore, in this study, Differential Transform Method (DTM) is applied to solve the relevant equations. First, the Timoshenko beam with 3D tip attachment whose centre of gravity is not coincident with beam end point is considered. The beam is assumed to undergo bending in two orthogonal planes and torsional deformation about beam axis. Using Hamilton’s principle the equations of motion of the system along with the possible boundary conditions are derived. Later DTM is applied to obtain natural frequencies and mode shapes of the system. According to the relevant literature DTM has not been applied to such a system so far. Moreover, the problem is modelled by Ansys, the well-known finite element method, and impact test is applied to extract experimental modal data. Comparing DTM results with finite element and experimental results it is concluded that the proposed approach produces accurate results.
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Rare cause of seizures: ruptured intracranial dermoid cyst
Rohat Ak,Fatih Doğanay,Muharrem Doğan 대한응급의학회 2019 Clinical and Experimental Emergency Medicine Vol.6 No.1
What is already known Intracranial dermoid cysts can present with a seizure. What is new in the current study Dermoid cysts should be considered in the differential diagnosis of seizures and total removal is recommended when possible.
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Aynur Atilla,Zahide Doğanay,Hale Kefeli Çelik,Leman Tomak,Özgür Günal,S. Sırrı Kılıç 대한마취통증의학회 2016 Korean Journal of Anesthesiology Vol.69 No.6
Background: The importance and efficacy of a care bundle for preventing central line-associated bloodstream infections (CLABSIs) and infectious complications related to placing a central venous catheter (CVC) in patients in the intensive care unit (ICU). Methods: A care bundle was implemented from July 2013 to June 2014 in a medical ICU and surgical ICU. Data were divided into three periods: the prior period (July 2012–June 2013), the intervention period (July 2013–June 2014; first and second periods), and the post-intervention period (July 2014–December 2014; third period). A care bundle consisting of optimal hand hygiene, skin antisepsis with chlorhexidine (2%) allowing the skin to dry, maximal barrier precautions for inserting a catheter (sterile gloves, gown, mask, and drapes), choice of optimal insertion site, prompt catheter removal, and daily evaluation of the need for the CVC was introduced. Results: The catheterization duration was longer and femoral access was more frequently observed in patients with CLABSIs. CLABSI rates decreased with use of the care bundle. The CLABSI rate in the medical ICU was 6.20/1,000 catheter days during the prior period, 3.88/1,000 catheter days during the intervention period, and 1.05/1,000 catheter days during the third period. The CLABSI rate in the surgical ICU was 8.27/1,000, 4.60/1,000, and 3.73/1,000 catheter days during these three periods, respectively. Conclusions: The choice of an optimal catheter insertion site, use of all barrier precautions, and removal of catheters when they are no longer needed are essential to decrease the CLABSI rate.
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