Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Ashyralyyev, Charyyar(18)
- Ashyralyev, A.(15)
- Dogan, Ramazan Ozgur(15)
- Ashyralyev, A(10)
- Ekinci, Murat(9)
- Lukashov, A.(9)
- Kayikçioglu, Temel(8)
- Malkowsky, E(8)
- Özden, Talat(8)
- Akinoglu, Bulent G.(7)
- Memetoglu, M. E.(7)
- Albayrak, Cenk(6)
- Ashyralyev, Allaberen(6)
- Cakir, Zafer(6)
- Dogan, Hulya(6)
- Kayikcioglu, Temel(6)
- Bingol, Ozkan(5)
- Bingöl, Ozkan(5)
- Cakalli, H.(5)
- Canak, I.(5)
- Demir, S.(5)
- Gedikli, Eyup(5)
- Gurtug, O.(5)
- Harte, R.(5)
- Kalkan, A.(5)
- Kandemir, H.S.(5)
- Kocinac, L.D.R.(5)
- Ozden, Talat(5)
- Ozsahin, M(5)
- Sadybekov, M.(5)
- Sahin, H.(5)
- Simsek, Cemaleddin(5)
- Tez, M.(5)
- Turan, I.(5)
- Yildirim, Omer(5)
- Çakmak, Recep(5)
- Akay, K.U.(4)
- Akpulat, Murat(4)
- Aliyazicioglu, Y.(4)
- Altas, Ismail H.(4)
Yayınlar
- BildiriYalnız künye2016Determination of the dynamic characteristics of the faculty building of law at KTU campus with HVSR and FSR methods
Bekar, Y.; Coban, K.H.; Sayil, N.
Seismic response characteristics of structures can be estimated by spectral ratios of microtremors measured on structures and their foundation ground surface. The microtremor horizontal-To-verticalspectral- ratio (HVSR) technique has received great attention from all over the world with its simplicity together with quick information about dynamic characteristics of ground and structures. The HVSR of microtremors gives a good estimation of natural building frequency. In this study, Horizontal-To-Vertical- Spectral-Ratio HSVR method and Floor Spectral Ratio Method (FSR) has been applied to microtremor records taken with three component broad band velocity seismometers in three different locations inside the building and one at outside with the aim of determining the dynamic characteristics of Faculty building of Law at The Karadeniz Technical University (KTU), in Turkey. The average predominant frequency, period and amplification values for the Faculty building of Law are calculated. The vibration frequency and period is around 3.5 Hz and 0.283 s, respectively. The amplitude values increase to the upper floors.
- BildiriYalnız künye20163D shoreline extraction using orthophoto and LiDAR data
Bayram, Bulent; Demir, Nusret; Ogurlu, Mustafa; Reis, Hatice Catal; Seker, Dursun Zafer
Shorelines are complex ecosystems and vital socio-economic environments. They may change rapidly due to both natural and human-induced effects. Determination of movements along the shoreline and monitoring of the changes are indispensable for many purposes such as coastline management, agriculture, decision support systems etc. Thus, rapid, up-to-date and accurate information are required to monitor the shorelines. In this study, the Kestel Dam Lake has been selected for evaluation and testing of the methods which will be used for the research project, about shoreline extraction with use of UAV-Based LIDAR data in the region of Terkos-Istanbul, which supported by TUBITAK (The Scientific and Technological Research Council of Turkey) with project nr. 115-718. Kestel Dam is located on the river of Kestel that is constructed for the irrigation purposes, built between 1983 and 1988. Irrigation capacity of dam is about 4077 ha of agricultural areas. The used dataset is LIDAR data which is provided by HGK (Turkish General Command of Mapping). In this study, two different methods are applied with use of LIDAR data, acquired in 2013. One method is mean-shift segmentation and the other is Particle Swarm Optimization Analysis (PSO). The results are both compared with manually created reference vector dataset which is created using orthoimage dataset. The results shows that the developed methods have potential to give success in the research project which will be performed in the region of Terkos which is the study area of the project.
AtıfScopus4
İncele - BildiriYalnız künye2016An assessment on the recent seismicity in the north anatolian fault zone, Turkey
Özturk, S.; Sari, M.
A statistical assessment of recent seismicity in the North Anatolian Fault Zone, Turkey, is made by using seismotectonic b-value and precursory seismic quiescence Z-value. The catalogue including 28,420 earthquakes between 1970 and 2016 is used. Using the Reasenberg declustering process and the earthquakes with MD≥2.7, 51.4% of the events are removed and so, 13,815 events are used for a quantitative evaluation of seismic quiescence in the NAFZ in the beginning of 2016. Completeness magnitude is estimated as 2.7. Resulting values show that significant anomalies are observed in both band Z-values in some parts of the NAFZ. The larger b-values are calculated in Silivri, Black Sea, Izmit and Düzce whereas the smaller b-values are estimated in the western, the eastern and the middle parts of the NAFZ, covering Gulf of Saros, Gelibolu (Çanakkale), Ismetpasa segment, Bingöl, Erzincan, Amasya and Çankiri. Several quiescence regions in and around Tekirdag, Gulf of Saros, Istanbul, Marmara and Black Sea, Izmit, Düzce fault, Mudurnu, Çankiri, Amasya are observed. Consequently, the same regions including Gulf of Saros, Çankiri and Amasya where the smallest b-values and the largest Z-values are obtained may give important evidences to reveal the future earthquake potential in the North Anatolian Fault Zone.
- BildiriAçık Erişim2016The impossibility of producing I-131 from its daughter Xe-131 by photonuclear reactions
Bayram, Tuncay; Akkoyun, Serkan; Çelik, Necati; Haciislamoǧlu, Emel; Uruk, Serhat; Şentürk, Şevki; Ristic, G
131I is one of the radioisotopes in nuclear medicine procedures for diagnostic and treatment purposes. It decays to 131Xe by emitting beta particles. In this study, we have investigated the reproduction possibility of 131I from 131Xe by using different reactions, including a photonuclear reaction step. We have used TALYS computer program for calculating cross-sections of the reactions. It was seen that it was not an easy task to reproduce 131I from its decay product 131Xe because of low reaction cross-section values. According to the results, we have seen that the calculations are in harmony with the TENDL 2014 database.
- BildiriYalnız künye2016A third order of accuracy difference scheme for Dirichlet type overdermined problem with mixed boundary value conditions
Ashyralyyev, Charyyar; Dedeturk, Mutlu; Lukashov, A.; Ashyralyev, A.
Approximation of Dirichlet type overdetermined multidimensional elliptic problem with Dirichlet-Neumann boundary conditions are discussed. A third order of accuracy difference scheme for its approximate solution is proposed. The stability, almost coercive stability and coercive stability inequalities for the solution of constructed difference scheme are established. Test example for a two-dimensional elliptic problem is presented.
- BildiriYalnız künye2016Stability estimates for solution of IBVP to fractional parabolic differential and difference equations
Ashyralyev, Allaberen; Cakir, Zafer; Lukashov, A.; Ashyralyev, A.
In this work, we investigate initial-boundary value problems for fractional parabolic equations with the Neumann boundary condition. Stability estimates for the solution of this problem are established. Difference schemes for approximate solution of initial-boundary value problem are constructed. Furthermore, we give theorem on coercive stability estimates for the solution of the difference schemes.
- BildiriYalnız künye2016Scopus SJRQ4Comparison of the antioxidant properties of some onion and garlic cultivars grown in Turkey
Koca, I.; Tekguler, B.; Odabas, H.I.; Gokce, A.F.
Garlic and onions are widely consumed among the vegetables in Turkey. The objective of this study was to determine the antioxidant properties of red, yellow and white onions, and Chinese and Taşköprü garlics grown in Turkey. The color, dry matter, total soluble solids, total phenolics and antioxidant activity values of the samples were determined. Total phenolic content was studied by the Folin-Ciocalteu method expressed as mg gallic acid equivalents g-1 dry weight (mg GAE g-1 DW), while antioxidant activity was analysed using two different methods as ferric reducing antioxidant power (FRAP, mmol Fe2+ g-1 DW) and, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity. Red onions had the highest total phenolic contents ranged from 6.60 to 9.85 mg GAE g-1 DW (8.40±1.06 mg GAE g-1 DW). The total phenolic contents of yellow onions, white onions, Chinese garlics and Taşköprü garlics were found as 4.41-9.55 mg GAE g-1 DW (7.19±1.96 mg GAE g-1 DW), 1.73-3.09 mg GAE g-1 DW (2.16±0.47 mg g-1 DW), 2.05-3.34 mg GAE g-1 DW (2.64±0.45 mg g-1 DW) and 1.05 to 2.08 mg GAE g-1 DW (1.59±0.38 mg GAE g-1 DW), respectively. Also, red onions had the highest antioxidant activity at 8.50±4.85 mmol Fe2+ g-1 DW and 69.68±15.95% for FRAP and DPPH assays, respectively. FRAP values of yellow onions, white onions, Chinese garlics and Taşköprü garlics were found as 3.84±2.02 mmol Fe2+g-1 DW, 1.46±0.43 mmol Fe2+ g-1 DW, 2.03±0.57 mmol Fe2+ g-1 DW and 1.26±0.32 mmol Fe+2 g-1 DW, respectively. DPPH radical scavenging activity (the percentage of DPPH reduced by 14.3 mg mL-1 extract) of yellow onions (42.25±8.32%) was higher than white onions (11.57±0.71%). DPPH radical scavenging activity of the garlic extracts (14.3 mg mL-1) was found to be less than 2%. In the present study, the highest antioxidant activity and total phenolics were found in red onions, while the lowest values was Taşköprü garlics.
AtıfScopus3WoS3OpenAlex6
İncele - BildiriYalnız künye2016Detection of permeability in irrigation dams with the electrical resistivity methods
Sari, M.; Seren, A.
It was aimed to identify the permeability of the dam area by collecting the information of 15 boreholes with 450 m depth in totally previously made along the dam axis line and the electric resistivity measurements along four lines vertical to the same axis line. Kirklartepe Dam, planned to be an irrigation dam for agricultural purposes, in the Central district of Bayburt province located in the northeastern region of Turkey was selected as the study area and it was tried to identify the permeability of the units forming the dam area. 2D and 3D underground views of the measurement lines were determined by implementing the inversion process to the electric resistivity measurements. While examining these sections, it was interpreted that anomaly areas with low resistivity values categorize an alluvial cone with permeable slope wash character, while anomaly fields with high resistivity categorize an impermeable metamorphic unit. Moreover, it was tried to reveal the permeability of the dam area by associating with the information of the present boreholes in the study area and creating section maps of 3D views obtained for each 10 m. Thus, it was observed that current boring information and electric resistivity measurement results supported one another.
- BildiriYalnız künye2016Stability estimates for solution of Bitsadze-Samarskii type inverse elliptic problem with Dirichlet conditions
Ashyralyyev, Charyyar; Akyüz, Gulzipa; Lukashov, A.; Ashyralyev, A.
In this study, we discuss well-posedness of Bitsadze-Samarskii type inverse elliptic problem with Dirichlet conditions. We establish abstract results on stability and coercive stability estimates for the solution of this inverse problem. Then, the abstract results are applied to three overdetermined problems for the multi-dimensional elliptic equation with different boundary conditions. Stability inequalities for solutions of these applications are obtained.
AtıfScopus4WoS4OpenAlex3İncele - BildiriYalnız künye2016Scheduling of domestic shiftable loads via Cuckoo search optimization algorithm
Cakmak, Recep; Altas, Ismail H.; Cetin, A.; Camurcu, A.Y.
Electrical power systems have been developed to more advanced structures called as smart grids. Among many other issues, demand side management (DSM) is one of the important instruments of the smart grids. DSM techniques increase the efficiency of the grid, and modify consumer's electrical demand via demand response (DR) programs using financial incentives. In this study, shiftable domestic loads scheduled by Cuckoo search algorithm (CSA) to ensure balanced load curve as much as possible while considering the consumers' preferences. The main motivation of this paper is scheduling the usage hours of the shiftable household appliances in a neighborhood by applying the recently developed metaheuristic CSA. This paper proposes an approach to increase the efficiency and lifetime of utility network by scheduling and operating shiftable domestic loads while considering consumer's demand in terms of financial benefits. Proposed CSA based scheduling mechanism is compared with that of Genetic algorithm (GA). The results reveal positive effects of the scheduling and the performance of the CSA over GA.
AtıfScopus23WoS9OpenAlex25İncele - BildiriYalnız künye2016Series multiple tuned mass dampers for vibration control of high-speed railway bridges
Kahya, V.; Araz, O.; Zingoni, A.
This paper presents Series Multiple Tuned Mass Dampers (STMDs) in vibration control of railway bridges under the passage of high-speed trains. In solution, the bridge is assumed as a Bernoulli-Euler beam, and the train is simulated as a series of moving forces with constant speed. A classic single TMD, and parallel Multiple TMD(MTMD) devices are also considered for the purpose of comparison. It is assumed that total absorber mass is the same for the devices considered. Optimum absorber parameters are obtained for the criterion based on the minimization of the maximum dynamic displacements of the beam at its midpoint. Control effectiveness and robustness of STMDs are discussed in comparison with other types of absorbers considered.
AtıfScopus21WoS10OpenAlex16İncele - BildiriAçık Erişim2016Scopus SJRQ4Assessment of sessile oak (quercus petraea L.) leaf as bioindicator for exploration geochemistry
Vural, A.
The element contents of sessile oak (Quercus petraea L.) leaves which grow on hydrothermally altered area with high element contents were studied at Gümüshane and its near vicinity. The aim of this study is to determine threshold element contents of Q. petraea L. leaves growing on the area. For this purpose, oak leave samples collected were analyzed by inductively coupled plasma-mass spectrometry for concentrations of some elements which were the group of most common trace elements in exploration geochemistry studies. The assessment of the element contents of the oak leaf is based on the descriptive statistics and computations of threshold values of leaves depending on statistical parameters and average element contents of the plants growing on lands in normal background values for the elements. According to Q-Q (normal quantile-quantile) plots, the Kolmogorov-Smirnov tests etc., all the elements, do not pass normality tests. Because of that, threshold values of the elements in leaves of oak were computed by median+median absolute deviation (MAD) and median+2MAD used in raw values for the elements. The data revealed that concentration levels of the examined elements in the leaves in the study area were determined as above and/or exceeded the upper limit of the normal range than in leaf of oak (Q. petraea L.) which grows on lands with normal elements background. Therefore, it is concluded that leaves of Q. petraea L. can be used as bioindicator in exploration geochemistry, especially for base metal ore deposits.
AtıfScopus8WoS8OpenAlex10İncele - BildiriYalnız künye2016Determination of the ground-building relationships in the KTU campus area with microtremor measurements
Beker, Y.; Sayil, N.; Akin, O.; Coban, K.H.
Microtremor measurement obtained by ground vibrations is one of the useful methods for determination of ground characteristics. Also the method has been using to specify building resonance risk during earthquakes in the last decades. In this study, single station microtremor recordings have been taken on the ground and at the 6 buildings in the KTU campus area. The measurements taken on the ground and in the buildings have been evaluated by Nakamura (H/V ratio) method. The eastern of the campus area presents Class-IV and the middle and western part of the campus present Class-II- Class-III according to Kanai and Tanaka ground classification. The predominant frequencies of the buildings are not in a harmony with the values of the ground. It can be deduce that the resonance risk is low for these buildings during the earthquakes. The H/V ratios of the ground change between 1-3 and lower than the buildings ratios which change between 5.0-8.5.
AtıfScopus1İncele - BildiriAçık Erişim2015Online learning in vocational school: focus on students' perceptions
Aydin, Sinan; Akkan, Yasar; Arpaz, Ercan; Koparan, Bulent; Iaman, A; Eskicumali, A
In this study, we describe vocational school students' practices and perceptions of online learning based on interviews and observations. First, we identify student characteristics within online classes. Then, we report student perceptions of online lectures. Finally, we summarize our recommendations to improve the online teaching. The methodology used in this study was qualitative data-collection techniques to obtain vocational school student views on online education and educational processes. For this purpose, two stages of data collection were used in this study these were one-on-one open-ended interviews and think-aloud observation. According to data analysis from this study, communication between students and teachers has a basic effect on shaping students' perceptions and approach to online learning. Also, they have some negative ideas of using and implementations of technology in lectures. Included in this finding is that the meaning assigned by students to any technological material used in lectures is directly connected with the way this material is implemented. Another important finding is that planning of course, assessment and curriculum plays basic role in student's concentrate on lectures and success in online learning. We investigated only a few of the possible relationships between perception of the online environment, the technological materials used in lectures, students' approach to online learning, and students' perceptions of this learning way. Although Web resources and community were mentioned in this study, they may play a more effective role in student online learning than was analyzed in this study. Some additional factors that may effect student perceptions needed to be investigated are the link between perception and outcome, faculty use and knowledge, faculty perceptions and training. (C) 2015 The Authors. Published by Elsevier Ltd.
AtıfWoS2OpenAlex25İncele - BildiriAçık Erişim2015Finite Element Based Investigation of Backfill Effects on Seismic Behavior of a Cantilever Wall
Cakir, Tufan; Drusa, M; Marschalko, M; Yilmaz, I; Segallini, A; Ferrero, AM; Bednarik, M
A series of finite element analyses were conducted to investigate the backfill effects on seismic behavior of a cantilever retaining wall incorporating backfill and subsoil interactions. Considering four different backfill soil conditions, the dynamic analyses of backfill-cantilever wall-soil/foundation system were carried out in time domain through ANSYS general purpose finite element computer program. The cohesionless soil was modelled as an elasto-plastic medium with viscous boundary applied on the artificial boundary of soil to simulate the wave energy absorption. Backfill-cantilever wall interface behavior was taken into account by using interface elements between the wall and soil to allow for de-bonding. The magnitudes of lateral displacements and stresses were determined. The obtained results show that the earthquake behavior of cantilever retaining walls can change considerably due to the backfill interaction. Thus, the backfill interaction should be considered in design criteria of cantilever walls. (C) 2015 The Authors. Published by Elsevier B.V.
AtıfWoS2OpenAlex8İncele - BildiriYalnız künye2015Scopus SJRQ1Enlarged inferior frontal gyrus volume might be a structural endophenotype for bipolar disorder: A voxel-based morphometry study
Saricicek, A.; Yalin, N.; Hidiroglu, C.; Cavusoglu, B.; Tas, C.; Ceylan, D.; Ada, E.; Tunca, Z.; Ozerdem, A.
- BildiriYalnız künye2015Scopus SJRQ1Oxidative DNA guanine base damage and base excision repair (BER) in euthymic patients with bipolar disorder
Ceylan, D.; Tuna, G.; Kirkali, G.; Tunca, Z.; Dizdaroglu, M.; Can, G.; Arat, E.; Özerdem, A.
AtıfWoS1İncele - BildiriYalnız künye2015Improvement of Palmprint Coding Techniques with Feature Descriptors
Bingöl, Ozkan; Ekinci, Murat
In recent years, biometric palmprint recognition system is one of the preferred research areas due to reach high accuracy even with the low resolution cameras. In recent studies conducted in this area, especially due to hygiene problems, images are taken in contactless and unrestricted environment. Despite a very successful improving methods have been developed for the images obtained in the restricted environment, shifts or projective distortions that occur in the palm pattern obtained from images taken in unconstrained environments negatively affect the success of this method. In this study, coding techniques that are commonly used palmprint recognition systems (Competitive Code, Ordinal Code, Derivative of Gaussian Filters Code) are strengthened with feature determinants (SIFT, SURF) and a new approach has been proposed. Scope of the study, a new data set consists of low-resolution images taken in unconstrained environments created and palmprint patterns obtained with the help of Active Appearance Model. First, performance rate of these coding techniques on the patterns were analyzed. Then, the advantages of 6 different approaches obtained by combining each feature determinant with each coding technique, is disclosed to the system.
AtıfWoS1İncele - BildiriAçık Erişim2015Comments on Non-Linear Piezoelectric Vibration Energy Harvesting From a Vertical Cantilever Beam with Tip Mass
Ünker, F.; Çuvalci, O.; Sener, S; Saridogan, E; Staub, S
This paper first points out the retaining higher order terms in the main equation of previous study (PS) of Friswell et al. (Journal of Intelligent Material Systems and Structures 23(13): 1505-1521, 2012). The equations of motion for the system are derived following energy (Lagrange) based approaches and the correct equation with the extra higher order terms is provided and simulations are redone in the current study (CS). (C) 2015 The Authors. Published by Elsevier Ltd.
AtıfWoS1OpenAlex1İncele - BildiriYalnız künye2015Scopus SJRQ1Abnormal white matter integrity in bipolar patients and their siblings: a diffusion tensor imaging study
Saricicek, A.; Zorlu, N.; Yalin, N.; Hidiroglu, C.; Cavusoglu, B.; Ceylan, D.; Ada, E.; Tunca, Z.; Ozerdem, A.