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Koleksiyondaki öğeler
- MakaleYalnız künye2022Scopus SJRQ2Proportional control moment gyroscope for two-wheeled self-balancing robot
Ünker, Faruk
A two-wheeled self-balancing robot is considered for investigating the responses of a control moment gyroscope powered by a proportional controller to prevent the robot rollover against the constant inertia forces because of accelerations of the wheels of the robot. The amplitudes of the frequency equations related to the required angular momentum of flywheels with an optimum controller gain were also found. A simulation model of the robot using computer-aided engineering software (RecurDyn) is built to verify the equations of a Lagrangian model. The results of both obtained from the Lagrangian and that from RecurDyn simulations are analyzed comparatively, in which the proportional control loop reduces the required flywheel speeds Ω of gyros and keeps the robot in a very small amplitude of a stable sinusoidal motion in the upright position.
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İncele - MakaleYalnız künye2023Scopus SJRQ3Investigation of the effect of liquid phase of digested biomass on Phaseolus vulgaris L. var. ellipticus Mart under NaCl stress
Çiftçi, Fida; Acet, Tuba; Saribiyik, Oǧuz Yunus
The factors such as global warming, wild irrigation, and synthetic fertilisers pollute the soil and increase salinity. The salinity is defined as salt stress for plants, and plants have developed various tolerance mechanisms to survive under salt stress conditions. Therefore, efforts to increase the tolerance of salt sensitive plants such as beans (Phaseolus vulgaris) are considered important. Additionally, considering problems that appear depending on global warming, understanding the tolerance mechanisms, and activating them by using natural and sustainable solutions are important for plant growth and preventing lower agricultural productivity. In this study, the effect of biofertiliser obtained from a small-scale bioreactor on a plant exposed to salt stress on the development of morphological, physiological, and biochemical properties of the model plant, Phaseolus vulgaris L. var. ellipticus Mart (Pve) were investigated. The biofertiliser application increased the amount of chlorophyll, flavonoids, anthocyanin, and proline while the amount of hydrogen peroxide and lipid peroxidation decreased in the plant. This change enhanced the enzyme activities of catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) and the plant formed tolerance to the salt stress. As a result, the biofertiliser application to the plant may activate the tolerance mechanism against salt stress.
- MakaleYalnız künye2024Scopus SJRQ2The effect of a serious game-based web application on stoma care education for nursing students: A randomized controlled trial
Kulakaç, Nurşen; Çilingir, Dilek
Aim: This study was carried out in a randomized controlled manner to determine the effect of a serious game based web application on stoma care education for nursing students. Method: The learning styles and digital game motivation levels of the students in the study were determined, and aprior knowledge test was performed. While the website of the serious game-based application was open to the access of the intervention group for two weeks, no intervention was made for the control group. Second knowledge and skil lmeasurements were performed after two weeks for all students in the study, and evaluations of retention were performed four weekslater. Findings: The analyses revealed that the second and retention stoma care and colostomy irrigation knowledge test and skill scores of the intervention group were significantly higher than those of the control group (p<0.05). Conclusion: As the students' time to use the serious game increased, their knowledge tests and skill scores also increased significantly. Therefore, it was concluded that serious game technology had a positive effect on teaching nursing students the practice of stoma care.
AtıfScopus18WoS14OpenAlex21İncele - MakaleAçık Erişim2024Scopus SJRQ2Convergence and data dependence results of the nonlinear Volterra integral equation by the Picard's three step iteration
Cona, Lale
Picard's three step iteration algorithm was one of the iteration algorithms that was recently shown to be faster than some other iterative algorithms in the existing literature. The purpose of this paper was to study using this iteration algorithm for the solution of nonlinear Volterra integral equations. It was investigated that the sequences obtained from this iteration algorithm converged to the solution of nonlinear Volterra integral equations. Moreover, data dependence was obtained for nonlinear Volterra integral equations. An example was given that confirmed the applicability of the newly proven theorems.
AtıfWoS1OpenAlex1İncele - Kitap BölümüYalnız künye2021Ombudsman as an Actor in Environmental Governance: A Conceptual Introduction
Doğan, Kadir Caner
- BildiriAçık Erişim2017Scopus SJRQ3K-Ar dating for determining the age of mineralization as alteration product: A case study of antimony mineralization vein type in granitic rocks of Gümüşhane area, Turkey
Vural, A.
Is it feasible to use K-Ar dating method in determination of the age of mineralization by utilizing alteration minerals? The purpose of this study was to examine the utility of the K-Ar dating method to accurately determine the age of mineralization. In ideal circumstances, dating of alteration products, such as illite and serisite minerals, gives the age of alteration event, which is indirectly associated with mineralization. In the study site, referred to as Avliyana, antimony mineralization (Gümüşhane, Turkey), stibnite (antimony) mineralizations of hydrothermal vein type were observed in granitic young intrusive rocks and the host rocks. In the study area, alteration was observed in the form of a small amount of weak silicification, argillitization (sericitization and illitization), hematitization, limonitization close to the mineralization and of epidotization and chloritization far from the mineralization. In order to determine the limits of the age of antimony mineralizations of the area, the K-Ar method was used to date illite and serisite minerals, which are alteration products related to mineralization. Two samples containing sericite and illite were collected from Avliyana antimonite mineralization. The alteration origin of these minerals was confirmed by supporting petrographic, XRD and scanning electron microscope studies. These samples were analysed for K-Ar dating.
AtıfScopus6WoS5OpenAlex11İncele - MakaleAçık Erişim2018Comparative analysis of mathematical knowledge in physics textbooks
Takaoğlu, Zeynep Başkan
When different disciplines that physics lesson is related are examined, it is seen that mathematics becomes prominent as one of the most used fields. Physics textbooks are the most significant resources to clarify this relationship. Therefore, in this study, it is aimed to analyze the involvement of mathematical knowledge in physics textbooks used during 2011-2012 and 2016-2017 academic year in Turkey and to evaluate them according to mathematics subject distribution. In line with this aim, 9 th , 10 th , 11 th , and 12 th -grade textbooks used in physics lessons during 2011-2012 and 2016-2017 academic years are examined through document analysis method. According to the research results, it is found that mathematical knowledge is mostly located in Force and Movement chapters in both physics textbooks belonging to two different years. The involvement of mathematical knowledge in the chapters can result from the fact that Force and Movement chapters are the most suitable chapters for daily practices of mathematics. Besides, it occurs that the most used mathematical knowledge is the category of numbers and operations. This is because of the fact that basic level knowledge is used more because all mathematical knowledge is based on numbers and four operations. In this respect, that mathematical knowledge involved in physics textbooks is very excessive stands as the most significant evidence for that there is a strong connection between physics and mathematics.
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2017Scopus SJRQ2Excited Muon Searches at the FCC-Based Muon-Hadron Colliders
Caliskan, A.; Kara, S.O.; Ozansoy, A.
We study the excited muon production at the FCC-based muon-hadron colliders. We give the excited muon decay widths and production cross-sections. We deal with the μp→μ∗q→μγq process and plot the transverse momentum and normalized pseudorapidity distributions of final state particles to define the kinematical cuts best suited for discovery. By using these cuts, we get the mass limits for excited muons. It is shown that the discovery limits obtained on the mass of μ∗ are 2.2, 5.8, and 7.5 TeV for muon energies of 63, 750, and 1500 GeV, respectively.
AtıfScopus14WoS8OpenAlex24İncele - MakaleYalnız künye2018Scopus SJRQ3On partial sums of normalized q-Bessel functions
Aktaş, Ibrahim; Orhan, Halit
In the present investigation our main aim is to give lower bounds for the ratio of some normalized q-Bessel functions and their sequences of partial sums. Especially, we consider Jackson's second and third q-Bessel functions and we apply one normalization for each of them.
AtıfScopus5WoS5İncele - Kitap BölümüYalnız künye2023Urinary system assessment
Demirag, Hatice; Hintistan, Sevilay
The urinary system plays an important role in establishing and maintaining homeostasis of the body and has functions such as excretion of metabolic wastes and maintenance of fluidelectrolyte balance. Poor functioning of this system also affects other systems of the body. In diseases affecting the urinary system, the patient may encounter many problems. It is important and necessary that nurses who are in direct and constant contact with patients have sufficient knowledge of history taking, methods of physical examination and diagnostic tests.
- MakaleAçık Erişim2019Scopus SJRQ4Rafalskia azizsancari sp. n., a new harvestman (Opiiiones: Phaiangiidae) from Turkey
Kurt, Kemal; Yaǧmur, Ersen Aydin; Tezcan, Erman
A new harvestman species, Rafalskia azizsancari sp. n., is described and illustrated based on male specimens collected from Bozdaglar Mountains, Izmir Province, Turkey. Most important differences between the new species and the three other species of the genus are included.
AtıfScopus4WoS3OpenAlex4İncele - MakaleAçık Erişim2016Scopus SJRQ3Physicochemical and bioactive properties of cakes incorporated with gilaburu fruit (Viburnum opulus) pomace
Şeker, I.T.; Ertop, M.H.; Hayta, M.
In this study the valorisation of a gilaburu (Viburnum opulus) fruit pomace, a waste product remaining after juice extraction, was investigated. The pomace was incorporated into cake formulation at the level of 0, 5, 10 and 15%, based on wheat flour weight. Results indicated that the batter viscosity increased and pH decreased by the increasing of the concentration of pomace level in cake formulation. Depending on incorporation level, reduction on the volume and height of the cake samples were observed. The hardness values increased whereas the chewiness and gumminess values of the cake samples decreased with an increasing of pomace incorporation level. Gilaburu pomace addition caused significant (P<0.05) changes on L*, a*, and b* values of crumb, whereas no significant differences have been determined on the L* and b* values of crust of the samples. In sensory analyses, 5% gilaburu pomace added cake sample had the highest overall acceptability score. The total phenolic content and radical-scavenging activity values of cake samples increased proportionally with the level of pomace incorporation. According to the study, evaluation of gilaburu pomace waste as ingredient in developing alternative functional and/or value-added products by the food industry could be suggested.
AtıfScopus13WoS12OpenAlex16İncele - MakaleYalnız künye2018Scopus SJRQ1Modal parameter identification of RC frame under undamaged, damaged, repaired and strengthened conditions
Altunişik, Ahmet Can; Karahasan, Olguhan Şevket; Genç, Ali Fuat; Okur, Fatih Yesevi; Günaydin, Murat; Kalkan, Ebru; Adanur, Süleyman
Structures are built on a design and then damaged in time by natural and manmade effects, repaired and strengthened for reusing. Determination of the structural behavior is very important to avoid future disaster. Operational Modal Analysis has been widely used recently to determine the inherent modal parameters of engineering structures and give significant information about the structural condition. Also, this method can be used to further studies such as model updating, damage detection and health monitoring. In this paper, it is aimed to investigate the changes of modal parameters considering undamaged, damaged, repaired and strengthened conditions using ambient vibration tests. For this purpose, a reinforced concrete frame model having two-floor with two spans in the longitudinal direction considering ½ geometric scales is built in laboratory. Four different cases are considered to emerge the efficiency of this procedure and the undamaged RC model is measured firstly to determine the initial modal parameters. Secondly, the lateral forces are applied to floor levels to obtain the damages, especially in beam-column joints. Thirdly, the damaged model is repaired using injection material and lastly strengthened with Carbon Fiber Reinforcement Polymer. It is also examined that what rate the dynamic characteristics return to back after repairing and strengthening studies by the comparison with undamaged condition? In addition to this the evaluation of carbon fiber reinforcement polymer effectiveness in strengthening for real applications is presented. It is seen that ambient vibration test is enough to identify the modal parameters of engineering structures for different conditions. The modal parameters are decreased distinctly with damages, and reverted almost initial condition with strengthening.
AtıfScopus40WoS35OpenAlex38İncele - MakaleYalnız künye2016Scopus SJRQ3Selective cytotoxic effect of Rhododendron luteum extract on human colon and liver cancer cells
Demir, Selim; Turan, Ibrahim; Aliyazicioglu, Yuksel
Purpose: The genus Rhododendron is distributed entirely in the world with the exception of South and Central America and Africa, growing in a large diversity of climatic conditions. This genus is a rich source of phenolic compounds, especially flavonoids, essential oils, chromones, terpenoids, and steroids. It has many biological properties such as antioxidant, anti-inflammatory, antiviral, antibacterial, anticancer, antidiabetic, immunomodulatory, cardioprotective and hepatoprotective among others due to their polyphenolic constituents. The objective of the current study was to evaluate the antioxidant properties and cytotoxic activity of dimethyl sulfoxide extract of flowers of Rhododendron luteum (DEFR) for the first time. Methods: The total polyphenolic contents (TPC), total flavonoid contents (TFC) and ferric reducing antioxidant power (FRAP) of the extract were evaluated using spectrophotometry procedures. The cytotoxic activity of the extract on three cancers (human breast, colon and liver carcinoma) and human foreskin fibroblast cells was determined using the MTT assay. Results: TPC and FRAP values were found 54.2+.0.38 mg gallic acid equivalents and 164.2±1.77 mg trolox equivalents per to g sample, respectively. R. luteum extract exhibited selective cytotoxicity against colon and liver cancer cells compared to normal fibroblast cells, while this selective cytotoxicity was not observed in breast cancer cells. Conclusion: Our results demonstrate that the Rhododendron luteum may be a great source of antioxidant and antitumor natural agents due to their capability of decreasing cancer cells proliferation.
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İncele - MakaleAçık Erişim2016Scopus SJRQ3Role of oxidative stress in the pathophysiology of Toxoplasma gondii infection
Dincel, Gungor Cagdas; Atmaca, Hasan Tarik
Oxidative stress (OS) plays an essential role in the pathogenesis of common neurodegenerative diseases. We have previously shown that Toxoplasma gondii (T. gondii) induces high nitric oxide (NO) production, glial activation, and apoptosis that altogether cause severe neuropathology in toxoplasma encephalitis (TE). The objective of this study was to investigate the cytotoxic effect of OS and to identify a correlation between the causes of T. gondii induced neuropathology. Expression levels of glutathione reductase (GR), Cu/Zn superoxide dismutase (SOD1), neuron specific enolase (NSE), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) were investigated. Results of the study revealed that the levels of GR (P <0.005) and NSE (P <0.001) expression in the brain tissue markedly increased while SOD1 activity decreased (P <0.001) in the infected group compared to the non-infected group. In addition, intense staining for 8-OHdG (P <0.05) was observed both in the nucleus and the cytoplasm of neurons and glial cells that underwent OS. These results were reasonable to suggest that T. gondii-mediated OS might play a pivotal role and a different type of role in the mechanism of neurodegeneration/neuropathology in the process of TE. The results also clearly indicated that increased levels of NO and apoptosis might contribute to OS-related pathogenesis of TE. As a result, OS and expression of NSE might give an idea of the disease progress and may have a critical diagnostic significance for patients with T. gondii infection.
AtıfScopus64WoS55OpenAlex62İncele - Kitap BölümüYalnız künye2019Tax competition: Evaluation in terms of tax havens
Yildiz, Bariş
- MakaleYalnız künye2021Scopus SJRQ1Adaptation of hurricane risk perception scale to earthquake risk perception and determining the factors affecting women's earthquake risk perception
Mızrak, Sefa; Özdemir, Ahmet; Aslan, Ramazan
Worldwide studies show that gender is an important variable affecting disaster risk perception and that women have high levels of disaster risk perception. The objective of this study is to investigate women’s earthquake risk perception as well as the factors that may help predict it. The data of the study were collected from 463 women living in Kocaeli (Turkey) by survey method. The study, which employed ordinary logistic regression analysis, analysed whether the same dependent variable was predicted by different independent variables in five models. Many of the women who participated in the research reported that they were more sensitive to earthquakes. The items with the highest mean among women's affective and cognitive risk perception factors are the items that measure fear and financial perception, respectively. Education and age significantly help predict women’s earthquake risk perception. Living in dread of earthquakes and being depressed and worried for future generations make women feel more sensitive. This study has showed that all the underlying factors affecting women's disaster risk perception should be understood more deeply. It is thought that the results of the study will contribute to studies related to disaster management, risk perception, and women.
AtıfScopus36WoS30OpenAlex55İncele - BildiriYalnız künye2021On well-posedness of source identification elliptic problem with nonlocal boundary conditions
Ashyralyev, Allaberen; Ashyralyyev, Charyyar; Zvyagin, Viktor G.
We study the well-posedness of the source identification problem for the two dimensional elliptic differential equation with nonlocal boundary conditions. Applying operator approaches, the exact estimates for the solution of this problem in Hölder norms are established.
- MakaleYalnız künye2020Scopus SJRQ1The role of blockchain in reducing the impact of barriers to humanitarian supply chain management
Ozdemir, Ali Ihsan; Erol, Ismail; Ar, Ilker Murat; Peker, Iskender; Asgary, Ali; Medeni, Tunc Durmus; Medeni, Ihsan Tolga
Purpose: The objective of this study is to investigate the role of blockchain in reducing the impact of barriers to humanitarian supply chain management (HSCM) using a list of blockchain benefits. Design/methodology/approach: A decision aid was used to explore the suitability of blockchain in humanitarian supply chains. To achieve that, first, a list of barriers to HSCM was identified. Then, the intuitionistic fuzzy decision-making trial and evaluation laboratory (IF–DEMATEL) method was utilized to determine the relationships and the level of interdependencies among the criteria. Finally, the intuitionistic fuzzyanalytic network process (IF–ANP) technique was employed, as it successfully handles dependencies among the criteria. Findings: The findings of this study suggest that interorganizational barriers are the most suitable ones, the impacts of which blockchain may alleviate. This study further suggests that trust turned out to be the most significant benefit criterion for the analysis. Research limitations/implications: The readers should construe the findings of this study with caution since it was carried out using the data collected from the experts of a particular country. Moreover, the proposed decision aid contemplates a limited set of criteria to assess a possible role of blockchain in overcoming the barriers to HSCM. Practical implications: The findings of this study can assist humanitarian supply chain managers to make more judicious assessments on whether they implement the blockchain in humanitarian supply chain operations. Specifically, this research may help decision makers to identify the certain barriers, the impact of which may be reduced by using the blockchain. The findings of this research will also help various decision makers make more rational decisions and allocate their resources more effectively. Originality/value: To the best of authors’ knowledge, no single study exists to investigate the role of blockchain in reducing the impact of barriers to HSCM using an intuitionistic fuzzy multi-criteria decision-making approach.
AtıfScopus87WoS65OpenAlex87İncele - MakaleYalnız künye2020Scopus SJRQ1Dynamic properties of sand-bitumen mixtures as a geotechnical seismic isolation material
Kuvat, Ahmet; Sadoglu, Erol
Geotechnical seismic isolation (GSI) has been emerged as an economical and alternative method in recent years that reduces earthquake that will affect the superstructure. Crumb rubber-granular soil mixtures (SRM) are generally used as damping geomaterial in this method. However, the major disadvantage of SRM is that the addition of rubber leads to significant reduction in stiffness of the granular soil. In this study, dynamic properties (secant shear modulus (Gsec) and damping ratio (D)) of sand and bitumen mixtures (SB) which can be used as damping materials in GSI systems were determined by cyclic triaxial tests. In addition, monotonic triaxial tests were performed to determine the pre- and post-cyclic behavior of the mixtures. In the cyclic tests, the effect of bitumen penetration and content on the energy absorption capacity of the bituminous specimens was examined depending on cyclic stress ratio (CSR), cell pressure and loading frequency. According to the findings, it was determined that higher bitumen penetration and (CSR) result in decrease of Gsec and increase of D, yet the increase in confining pressure and the increase in loading frequency have the opposite effect. For the specimens prepared with both bitumen types, it was specified that the D increased depending on the increase of bitumen content, and the highest Gsec value was observed to be bitumen content of 8%. Moreover, the findings obtained from the monotonic triaxial tests showed that after a high number of cyclic loading, the peak deviatoric stresses of the SB samples increase slightly.
AtıfScopus37WoS32OpenAlex31İncele
