Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/1624

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Citation - WoS: 1
Citation - Scopus: 2
Adaptive State Feedback Control Method Based on Recursive Least Squares
(Kauno Technologijos Universitetas, 2022) Levent, Mehmet Latif; Aydoğdu, Ömer
This study revealed an adaptive state feedback control method based on recursive least squares (RLS) that is introduced for a time-varying system to work with high efficiency. Firstly, a system identification block was created that gives the mathematical model of the time-varying system using the input/output data packets of the controller system. Thanks to this block, the system is constantly monitored to update the parameters of the system, which change over time. Linear quadratic regulator (LQR) is renewed according to these updated parameters, and self-adjustment of the system is provided according to the changed system parameters. The Matlab/Simulink state-space model of the variable loaded servo (VLS) system module was obtained for the simulation experiments in this study; then the system was controlled. Moreover, experiments were carried out on the servo control experimental equipment of the virtual simulation laboratories (VSIMLABS). The effectiveness of the proposed new method was observed taking the performance indexes as a reference to obtain the results of the practical application of the proposed method. Regarding the analysis of simulation and experimental results, the proposed approach minimizes the load effect and noise and the system works at high efficiency. © 2022 Kauno Technologijos Universitetas. All rights reserved.
Citation - Scopus: 2
Air Quality Status in Konya City Centre, Konya, Turkey During Pandemic Covid-19
(Institute of Physics, 2022) Yahaya, N. Z.; Jalaludin, J.; Toros, H.; Dursun, S.
High developed industry regions, provincial centers with a heavy traffic and dense populations with cold winters, using low-quality fossil fuel consumption have an effect on quality of life especially for people with respiratory diseases. The air quality data gathered from air monitoring stations for the City Center of Konya, Turkey were analysed statistically during the period when curfew due to the Covid-19 pandemic in 2020. The restrictions that cause the reduction of vehicle exhaust emissions, which are important factors in the formation of some air pollutants, are thought to be effective in improving the air quality as well as meteorological conditions are effective on the days when the air quality is analysed. It is thought that the reduction in HC, NOx, CO and PM emissions, which can be evaluated as exhaust emissions, will be an effective factor due to the restrictions of Covid-19 pandemic. Comparing between the 2019 and 2020 MCO data, we identified that most of the gases decreased with NO2 (-24 ?g/m3), SO2 (-24 ?g/m3), CO (-37 ?g/m3) and an increment of O3 of +50 ?g/m3 which indicates that the MCO and restricted of movement were give an impact to air quality levels in Konya City. The increase in O3 values were found by the existing of the sun rays in the atmosphere with the formation of O3 during the clean air period. © Published under licence by IOP Publishing Ltd.
Citation - WoS: 14
Citation - Scopus: 13
All-Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of Cvd Graphene
(WILEY-V C H VERLAG GMBH, 2019) Çıtak, Emre; İstanbullu, Bilal; Şakalak, Hüseyin; Gürsoy, Mehmet; Karaman, Mustafa
In this study, the successful transfer of chemical vapor deposition (CVD)-grown graphene on an ordinary printing paper surface is demonstrated. Pristine paper is not a suitable substrate for graphene transfer because of its fragile and hydrophilic nature against the chemicals used during the transfer process. Two different fluoroalkyl polymers, namely poly(hexafluorobutyl acrylate) (PHFBA) and poly(perfluorodecyl acrylate) (PPFDA) are coated on paper surfaces by an initiated CVD (iCVD) technique to make the paper surfaces hydrophobic. Hydrophobicity is found to be an important factor in order for the graphene to be transferred onto the paper substrate. Although surfaces coated with PPFDA possess better hydrophobicity owing to their longer perfluoroalkyl group and higher roughness, the graphene transfer is found to be more successful on a PHFBA-coated surface. A thin film of PHFBA on the paper surface acts as a prime layer for effective and defect-free transfer of graphene and makes the paper surface ideal and robust during the graphene transfer process. The as-transferred graphene layer on the PHFBA-coated paper surface shows high conductivity values, even after repeated folding and flattening cycles.
Citation - WoS: 23
Citation - Scopus: 24
All-Dry Patterning Method To Fabricate Hydrophilic/Hydrophobic Surface for Fog Harvesting
(SPRINGER, 2020) Gürsoy, Mehmet
Inspired by natural creatures that live in the arid climate, fog harvesting can be an efficient approach to overcome freshwater scarcity. Fog harvesting ability of the creatures is mainly based on wettability differences of their surfaces. In this study, inspired by creatures that have hydrophilic regions surrounded by hydrophobic areas, a novel all-dry patterning method was applied to fabricate hydrophilic/hydrophobic patterned surfaces for fog harvesting. For this purpose, patterned surfaces were produced using plasma-enhanced chemical vapor deposition (PECVD) method with the help of a commercial magnet and iron powders. The idea behind the use of the magnetic field during PECVD deposition is to hold light iron particles on the substrate under the vacuum environment for masking substrate surface. For the first time, the magnetic field was used to fabricate patterned surfaces in vapor-phase polymerization. Ordinary glass slides were successfully transformed into hydrophilic/hydrophobic patterned glasses. The obtained results showed that the combination of hydrophobic and hydrophilic regions improved the fog harvesting performance.
Citation - WoS: 5
Citation - Scopus: 3
Ar-Ar Geochronology and Sr-Nd Isotopic Systematics of the Post-Collisional Volcanic Rocks From the Karapinar-Karacadag Area (central Anatolia, Turkey): an Alternative Model for Orogenic Geochemical Signature in Sodic Alkali Basalts
(Ceska Geologicka Spolecnost, 2022) Gençoğlu Korkmaz, Gülin; Kurt, Hüseyin; Asan, Kürşad; Leybourne, Matthew
The Plio???Quaternary post-collisional volcanism in the Karap??nar area is represented by two occurrences: (1) Karacada?? Volcanic Complex (KCVC) and (2) Karap??nar Volcanic Field (KPVF). The investigated volcanic units are the southwes-tern part of the Neogene to Quaternary Cappadocia Volcanic Province (CVP) in Central Anatolia. The CVP generally displays calc???alkaline affinity in the Late Miocene to Pliocene rocks, but both calc-alkaline and sodic alkaline affinity in the Plio???Quaternary rocks, all of which have an orogenic geochemical signature. Such a volcanic activity contradicts the Western and Eastern Anatolian volcanism characterized by anorogenic OIB-like sodic alkaline volcanic rocks postdating early orogenic calc???alkaline ones. We hypothesize that such temporal and geochemical variations in the investigated rocks result from crustal contamination and present major and trace element chemistry and Sr???Nd???Pb???O isotope geochemistry, coupled with 40Ar/39Ar geochronology data to restrict the genesis and evolution of the rocks. The Neogene Karacada?? volcanic rocks are represented by lava flows, domes and their pyroclastic equivalents constituting a stratovolcano, and dated by new 40Ar/39Ar ages of 5.65 to 5.43 Ma. They are mainly composed of andesitic, rarely basaltic, dacitic and trachytic rocks and have a calc???alkaline character. Constituting a monogenetic volcanic field, the Quaternary Karap??nar volcanic rocks are typically formed by cinder cones, maars and associated lavas, including xenoliths and xenocrysts plucked from the Karacada?? rocks. They comprise basaltic to andesitic rocks with a transitional affinity, from sodic alkaline to calc???alkaline. Both the Karacada?? and Karap??nar volcanic rocks display incompatible trace element patterns rather characteristic for orogenic volcanic rocks. The Sr, Nd and Pb isotopic systematics of both units show a relatively narrow range, but their ??18O values are markedly different. The Karacadag volcanic rocks have ??18O values ranging from 7.5 to 8.9 ???, resembling those of subduction-related basalts, but the Karap??nar volcanics have ??18O ratios between 5.7 and 6.5 ??? corresponding to OIB-like rocks. Additionally, ??18O values and 87Sr/86Sr ratios correlate positively with SiO2 in the rocks, indicating that contamination played an important role during differentiation processes. All the data obtained suggest that the Karacada?? basaltic rocks stemmed from a subduction-modified lithospheric mantle source. On the other hand, the origin of the Karap??nar basaltic rocks can be explained in terms of OIB-like melts contaminated with the Karacada?? volcanic rocks to gain orogenic geochemical signature, which may be an alternative model for the origin of the CVP sodic alkali basalts.
Citation - WoS: 16
Citation - Scopus: 17
Assessment of Natural Radioactivity Level of Soil and Water in the Region of Corlu (turkey)
(SPRINGER, 2021) Manisa, Kaan; Erdoğan, Mehmet; Usluer, Ali; Çetinkaya, Hakan; Işık, Ulaş; Şahin, Latife; Zedef, Veysel
The activity concentrations of Rn-222 with an AlphaGUARD system in well having different depths and in natural spring waters were measured to assess the natural radioactivity level of the corlu region. The measured concentrations varied from 22.04 to 63.92 Bq L-1 for 6 well water samples, 15.38-24.33 Bq L-1 for 6 spring water samples. The activity concentrations from U-238, Th-232 and K-40 in 11 soil samples collected from the same region were also determined and the outdoor gamma dose rates at 1 m above the surface at the same sampling points were measured. The results obtained in this study lie within safe limits recommended by WHO and UNSCEAR with the exception of the mean specific activity of K-40 radionuclide.
Citation - WoS: 2
Citation - Scopus: 2
Autonomously Simultaneous Localization and Mapping Based on Line Tracking in a Factory-Like Environment
(VSB-TECHNICAL UNIV OSTRAVA, 2019) Durdu, Akif; Korkmaz, Mehmet
This study is related to SLAM, also known simultaneous localization and mapping which is highly important and an indispensable issue for autonomous mobile robots. Both an environment mapping and an agent's localization are provided with SLAM systems. However, while performing SLAM for an unknown environment, the robot is navigated by three different ways: a user guidance, random movements on an exploration mode or exploration algorithms. A user guidance or random exploration methods have some drawbacks that a user may not be able to observe the agent or random process may take a long time. In order to answer these problems, it is searched for a new and autonomous exploration algorithm for SLAM systems. In this manner, a new kind of left-orientated autonomous exploration algorithm for SLAM systems has been improved. To show the algorithm effectiveness, a factorylike environment is made up on the ROS (Robot Operating System) platform and navigation of the agent is observed. The result of the study demonstrates that it is possible to perform SLAM autonomously in any similar environment without the need of the user interference.
Citation - WoS: 36
Citation - Scopus: 44
Behavior and Removal of Ciprofloxacin and Sulfamethoxazole Antibiotics in Three Different Types of Full-Scale Wastewater Treatment Plants: a Comparative Study
(SPRINGER INTERNATIONAL PUBLISHING AG, 2021) Nas, Bilgehan; Dolu, Taylan; Koyuncu, Serdar
Due to the inadequate removal rates of drug residues in wastewater treatment plants (WWTP), the transition of these compounds into the environment has become a serious environmental problem for ecosystems and public health. In this study, occurrence, fate, and removal of widely consumed two antibiotics, ciprofloxacin (CIP) and sulfamethoxazole (SMX), selected from fluoroquinolone and sulfonamide groups, respectively were investigated in three different types of full-scale WWTPs located in Turkey. In this context, three WWTPs consisting of advanced biological treatment (large-scale), wastewater stabilization pond (WSP) (medium-scale), and constructed wetland (CW) (small-scale) were selected. While the detected influent concentrations of CIP in WWTPs ranged between the 218.6 and 2733.5 ng/L, maximum influent concentration for SMX in the same plants was determined as 179.7 ng/L. On the other hand, although it was detected at higher concentrations in raw wastewater, CIP was significantly removed in all WWTPs with a removal efficiency ranging from >77.1 to >98.2%. However, SMX showed quite different behaviors depending on the applied wastewater treatment processes in WWTPs in terms of total removal achieved. While treated in WSP well enough (>72.2%), a serious negative removal efficiency (-133.4%) was achieved for SMX in the WWTP having advanced biological treatment. Best removal performance obtained for the both antibiotic compounds among the investigated WWTPs was the medium-scale WSP consisting of anaerobic and facultative stabilization ponds, consecutively. This situation also supported the idea that WWTPs which are operated with higher solid retention time (SRT) and hydraulic retention time (HRT) contribute positively in the removal of antibiotic compounds.
Citation - WoS: 2
Citation - Scopus: 1
Bernstein-Walsh Polynomial Inequalities in Domains Bounded by Piecewise Asymptotically Conformal Curve With Nonzero Inner Angles in the Bergman Space
(SPRINGER, 2019) Abdullayev, F.G.; Abdullayev, G.A.; Şimşek, Dağıstan
We continue our investigation of the order of growth of the modulus of an arbitrary algebraic polynomial in the Bergman weight space, where the contour and weight functions have certain singularities. In particular, we deduce a Bernstein-Walsh-type pointwise estimate for algebraic polynomials in unbounded domains with piecewise asymptotically conformal curves with nonzero inner angles in the Bergman weight space.
Citation - WoS: 1
Citation - Scopus: 1
Bi-Objective Optimization for Joint Production Scheduling and Distribution Problem With Sustainability
(SPRINGER INTERNATIONAL PUBLISHING AG, 2021) Yağmur, Ece; Kesen, Saadettin Erhan
This paper considers joint production and distribution planning problem with environmental factors. While the production phase of the problem consists of job shop production environment running under Just-In-Time (JIT) philosophy, the distribution phase involves a heterogeneous fleet of vehicles with regards to capacity and fuel consumption rate. Therefore, we tackle two well-known problems in Operations Research terminology which are called machine scheduling and vehicle routing problems. The joint problem is formulated as a bi-objective structure, the first of which is to minimize the maximum tardiness, the second of which aims to minimize the total amount of CO2 emitted by the vehicles. Orders are required to be consolidated to reduce the traveling time, distance, or cost. An increase in the vehicle capacity results in a higher possibility of consolidation, but in this case, the amount of CO2 emission that the vehicle emits into the air will also increase. Having shown that two objectives are conflicting in an illustrative example, we formulate the problem as amixed integer programming (MIP) formulation and use an Augmented Epsilon Constraint Method (AUGMECON) for solving the bi-objective model. On randomly generated test instances, the applicability of the MIP model through the use of AUGMECON is reported.
Citation - WoS: 5
Citation - Scopus: 7
Biochar Produced From Co-Pyrolysis of Olive Pomace & Crude Oil as an Adsorbent for Cr (vi) Removal From Aqueous Solutions
(Iranian Institute of Research and Development in Chemical Industries, 2022) Almezgagi, Maha; Kaya Güzel, Gülcihan; Kar, Yakup; Deveci, Hüseyin
This study investigated aqueous solution treatment to remove Cr (VI) using a biochar-based adsorbent. Olive pomace and crude oil were used to synthesize the biochar adsorbent via co-pyrolysis for the first time. The biochar properties were examined with Fourier Transform Infra-Red (FT-IR) spectroscopy, scanning electron microscopy (SEM), and Energy Dispersive X-ray (EDX) analyses before and after adsorption. The adsorption experiments were carried out in a batch process under different experimental conditions. The optimum adsorption efficiency was experimentally found to be at pH of 1.5, contact time of 15 min, Cr (VI) initial concentration of 20 mg/L, adsorbent dose of 0.4 g, and 303 K. Langmuir and Freundlich isotherms were used to evaluating the adsorption performance of biochar, and the Langmuir isotherm model was well fitted to experimental data with a maximum adsorption capacity of 9 mg/g. Kinetic experimental data was best described using a pseudo-second-order kinetic model. The thermodynamic parameters of the adsorption process were examined in detail, and the process was exothermic and spontaneous in nature. It is concluded that biochar can be successfully used as an adsorbent for the treatment of Cr (VI) contaminated water. Additionally, the evaluation of olive pomace provided not only a decrease in waste accumulation in the olive production industry but also the synthesis of an inexpensive and environmentally friendly adsorbent. © 2022, Iranian Institute of Research and Development in Chemical Industries. All rights reserved.
Citation - WoS: 6
Citation - Scopus: 7
Biostratigraphy of Lower Permian Foraminiferal Assemblages From Platform-Slope Carbonate Blocks Within the Mersin Melange, Southern Turkey: Paleogeographical Implications
(ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER, 2020) Okuyucu, Cengiz; Tekin, U. Kağan; Bedi, Yavuz; Sayit, Kaan
The Mersin Melange (MM) as a part of the Mersin Ophiolitic Complex in southern Turkey is a sedimentary complex including blocks and tectonic slices within a Late Cretaceous matrix. Two blocks (Keven and Cingeypinari) within the MM originated from the northern branch of Neotethys (Izmir-Ankara-Erzincan Ocean) and have been studied in detail using foraminiferal assemblages to correlate them with coeval successions in the Taurides and to approach the Early Permian evolution of the northern branch of the Neotethys. The Keven block includes mainly slope deposits (poorly-sorted carbonate breccia and fossiliferous calcarenite) and dated as late Asselian-Sakmarian, whereas the Cingeypinari block consists of platform deposits (fossiliferous platform carbonate and quartz sandstone alternation) assigned to the Sakmarian-early Artinskian. These Early Permian Cingeypinari and Keven blocks from the Beysehir-Hoyran Nappes are biostratigraphically well correlated to the northerly originated Hadim nappe and its equivalents in the Tauride Belt. Considering recent studies on the Mersin Melange, a possible mantle plume existed during the Late Carboniferous-Early Permian time interval along the northern Gondwanan margin. This event led to the opening of the northern Neotethys and deposition of the pelagic Karincali sequence with volcanic material in the basinal conditions. The data presented suggest that the Keven block relates to the slope and the Cingeypinari block to platform conditions deposited as a lateral equivalent of the Karincali sequences during the Early Permian. (C) 2020 Elsevier Masson SAS. All rights reserved.
Citation - WoS: 13
Citation - Scopus: 15
Chemometric Approaches for the Characterization of the Fatty Acid Composition of Seventeen Mushroom Species
(TAYLOR & FRANCIS INC, 2020) Çayan, Fatih; Deveci, Ebru; Çayan, Gülsen Tel; Duru, Mehmet Emin
Mushrooms have been used since ancient times because of their nutritional, medicinal and economic potential. In this study, fatty acid compositions of seventeen mushroom species, naturally growing in Turkey, were determined by using gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). Totally, twenty-four fatty acids were identified in mushroom species. Generally, oleic (6.76-59.25%), linoleic (6.45-61.63%), palmitic (3.57-28.09%) and stearic (0.90-19.77%) acids were identified as the main fatty acids in all studied mushroom species. Principal component analyses (PCA) and hierarchical clustering analyses (HCA) were applied to analyze the chemometry of twenty-four fatty acids of the seventeen mushroom species by using Minitab 16.0 software. The main fatty acid compounds found in the mushrooms and their concentrations have been effective in distinguishing mushroom species from each other. As a result of PCA and HCA analysis, it was determined that Daedalea quercina (DQ) was distinctly separated from other mushroom species in terms of fatty acid composition. This study reveals that the chemometric analysis by PCA and HCA techniques could be used for the classification of the mushroom species according to their fatty acid compositions.
Citation - WoS: 12
Citation - Scopus: 14
Chemometrics Evaluation of Phytochemicals and Antioxidant Activities of the Extracts of Chaerophyllum Bulbosum Roots and Aerial Parts
(TAYLOR & FRANCIS INC, 2022) Çayan, Gülsen Tel; Deveci, Ebru; Çayan, Fatih; Molo, Zeynep; Duru, Mehmet Emin; Yeşil, Yeter
The objective of this study was provide the first report to assess the high-performance liquid chromatography-diode array detection (HPLC-DAD) identification of phytochemicals, the spectrophotometric determination of total phenolics and flavonoids, and antioxidant activities of the root and aerial extracts of Chaerophyllum bulbosum. HPLC-DAD identified the main phytochemical to be rosmarinic acid in the roots in the acetone (CBRA) (13.98 +/- 0.12 mg/g) and the aerial water (CBAW) extract; myricetin (8.30 +/- 0.22 mg/g) in the root methanol extract (CBRM); trans-aconitic acid (6.46 +/- 0.49 mg/g) in the root water extract (CBRW) and fumaric acid in the aerial methanol (CBAM) (17.43 +/- 0.87 mg/g) and water CBAW (18.96 +/- 0.81 mg/g) extracts. The concentrations of total phenolics and flavonoids were 2.00 +/- 0.14-17.79 +/- 0.99 mu g PEs/mg extract and 2.90 +/- 0.00-27.64 +/- 0.37 mu g QEs/mg extract, respectively. The highest antioxidant activity was found in the root acetone extract (CBRA) using the beta-carotene-linoleic (IC50: 172.31 +/- 0.16 mu g/mL) and CUPRAC (A(0.50): 126.00 +/- 0.24 mu g/mL) assays and in the root water extract (CBRW) for DPPH center dot (IC50: 59.51 +/- 0.21 mu g/mL) and metal chelating (IC50: 65.91 +/- 0.36 mu g/mL) assays in the aerial water extract (CBAW) using the ABTS(center dot+) (IC50: 59.51 +/- 0.21 mu g/mL) assay. The relationship between the phytochemicals and antioxidant activities of the extracts was chemometrically determined by principal component analysis (PCA) and hierarchical cluster analysis (HCA).
Chromatographic Evaluation of Tocols and Sterols of Processed Canola Oil and Deodorizer Distillate
(TUBITAK, 2022) Shoaib, H.; Sherazi, S.T.H.; Naz, S.; Mahesar, S.A.; Khaskheli, A.R.; Uddin, S.; Topkafa, Mustafa
Tocopherols and tocotrienols in the combined form are known as tocols. Changes of total and individual tocols and sterols concentration of canola oil and deodorizer distillate (DD) during different processing stages were evaluated with the application of gas chromatography (GC) and high-performance liquid chromatography (HPLC). For sterols analysis, GC coupled with flame ionization detector (FID) was used while tocols in canola oil samples and DD, normal phase (NP) HPLC was applied. The results of the present study indicated that levels of total and individual tocols and sterols content were decreased during processing (neutralization to deodorization). Deodorization was found to be the most effective process for the reduction of total sterols and tocols as 55.9% and 34.2%, respectively. A high amount of tocols and sterols was observed in DD. Among tocols and sterols; beta tocopherol (?-T) and ?-sitosterol were found to be in greater concentration 53.97% and 31.82%, respectively. Therefore, DD could be used as a valuable by-product in the cosmetics and food industries. © 2022 TUBITAK. All rights reserved.
Citation - WoS: 4
Citation - Scopus: 4
Coating of Hydrophilic Poly(hydroxypropyl Methacrylate) Thin Films Via Pulsed-Initiated Chemical Vapor Deposition Method
(SPRINGER, 2021) Mercan Sevgili, Emine; Karaman, Mustafa
This study demonstrates the coating of poly(hydroxypropyl methacrylate) (PHPMA) thin films from the corresponding monomer HPMA using pulsed-initiated chemical vapor deposition (pulsed-iCVD) method. The advantages of pulsing the power delivered to the filament wires during iCVD through successive on-off duty cycles (DC) are outlined by considering the deposition rates, structure, and morphology of as-deposited PHPMA films. FTIR and XPS analysis of the as-deposited films verifies that pulsing the filament power produces thin films of PHPMA, which is structurally very similar to that synthesized using classical continuous power iCVD. However, there is up to 70% increase in deposition rate upon pulsing the filament power in comparison with the continuous power iCVD. AFM analysis of the as-deposited films shows that the film morphology can be controlled by varying the DC during pulsed-iCVD. At a DC of 85.7%, the most hydrophilic film is observed with a measured water contact angle of 31 degrees.
Citation - WoS: 3
Citation - Scopus: 2
Common Terms of Tribonacci and Perrin Sequences
(Univ Miskolc Inst Math, 2022) Açıkel, Abdullah; Irmak, Nurettin
Assume that T-n is the n(th) term of Tribonacci sequence and R-m is the m(th) term of Perrin sequence. In this paper, we solve the equation T-n = R-m completely.
Citation - WoS: 2
Citation - Scopus: 4
A Comprehensive Study About Low-Cost and Limited Bandwidth Fmcw Bio-Radar: Detailed Analyses on Vital Signs Measurements
(Walter De Gruyter Gmbh, 2022) Şeflek, İbrahim; Yaldız, Ercan
In this study, a bio-radar system has been constituted using a frequency modulated continuous wave (FMCW) radar with low cost and limited bandwidth, taking into account of the lack of range the continuous wave (CW) radar. The displacement and vibration frequencies have been determined at a distance of 3.5-5 m for single and multiple targets via the help of the target test mechanism. Then, the detection of vital signs has been achieved with healthy human subject measurements. For a single human subject, respiration rate (RR) errors at 3.5 m and 5 m distances are 4% and 4.42%, respectively, and 13.25% and 15.16% for heartbeat rate (HR). In multiple targets measurements, although targets do not create an obstacle to each other, a slight deterioration has been observed in the signals and the error rates increase. The results show that bio-radar have a promising future to replace contact devices in medical applications.
Citation - WoS: 4
Citation - Scopus: 4
Depositional and Geochemical Characteristics of Geomorphologically Controlled Recent Tufa Deposits on the Goksu River in Yerkopru (konya, Southern Turkey)
(SPRINGER, 2019) Delikan, Arif; Mert, Mehmet
Recent tufa deposition has been taking place on a 500m-long natural bridge on the Goksu River in the Yerkopru region, southern Konya, Turkey. The Karasu spring arises from the Karasu normal fault, flows over this natural bridge and drops down from the end of the bridge, forming a spectacular waterfall. There is a dense CO2 degassing from this water and the H2CO 3
Citation - WoS: 4
Citation - Scopus: 6
Design and Implementation of a Wind Turbine Emulator Using an Induction Motor and Direct Current Machine
(INT JOURNAL RENEWABLE ENERGY RESEARCH, 2020) Gökkuş, Göksel; Kulaksız, Ahmet Afşin
The study deals with the application details and validation of a wind turbine emulator (WTE) consisting of a user interface, 1.5kW squirrel-cage induction motor (IM) and separately excited direct current machine (DCM). To this end, an induction motor and direct current machine are mechanically coupled to behave like wind turbine. Thus, by controlling the asynchronous motor over wind data, the shaft of the asynchronous motor rotates like the high turbine shaft of the wind turbine and emulates the wind turbine in the laboratory environment. The user interface includes 12 commercial wind turbines with similar characteristics. The user selects the wind data for a day, then selects the wind turbine and operates the system. The system generates reference speed information in accordance with the user's preferences. The WTE calculations are performed on a PC and 32 bit ARM cortex board, both connected on UART. The generated speed information is applied to the frequency converter via the PI control technique and the induction motor is driven according to the reference speed. The purpose of the study is the hardware implementation of a wind energy conversion system for control and online monitoring in a laboratory environment. The system will allow testing various wind data and performing efficiency analyzes at any time and will enable the testing of small-scale power converters for wind power systems.

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