Yıldız Technical University Research Information System
Not a member yet
91324 research outputs found
Sort by
A new distributed charge approach for the electric vehicle parking lots considering coordination between DSO and EV operators
The proliferation of electric vehicles (EVs) causes a series of significant operational challenges for distribution system operators (DSOs) such as voltage control and power losses. This paper proposes a novel optimal charge scheduling method that balances the interests of both the DSO and the EV parking lot (EVPL) operator. Within the coordinated framework of Alternating Direction Method of Multipliers based distributed solution, the DSO aims to maximize the load factor, while the EVPL operator seeks to minimize charging costs. The proposed method avoids peak loading caused by the EVPL during low price time intervals, while it prevents the higher operation costs due to the high price time intervals caused by the DSO's day ahead pricing scheme. Furthermore, the presented optimization model is experimentally tested for the individual operations, and coordinated operation
Investigation of the Therapeutic Contribution of the Nanoconjugated Form Using Sono-Photochemical Application; Novel Indium Phthalocyanine and Its Cystein-Functionalized Graphene Quantum Dot Derivative
This study aimed to synthesize sensitizer molecules with high therapeutic efficacy using a new indium phthalocyanine (InPc) with halogen substituents and novel supramolecular hybrids containing graphene quantum dots (GQDs). 4-Tetra-(2-bromo-4-methylphenol) phtalocyaninato indium(III) chloride was immobilized via π–π stacking interaction on GQDs functionalized with cysteine. The photochemical and sono-photochemical features were determined for both indium phthalocyanine alone and its respective conjugate to investigate their potential in advanced cancer therapies with enhanced singlet oxygen generations. The nanoconjugate form of InPc demonstrated better singlet oxygen quantum yields with results reaching to Φ∆(SPDT) = 1.31 and Φ∆(PDT) = 0.81 as compared to the InPc alone. These results also confirm that sono-photochemical method enhances therapeutic activity due to the combined benefits of light an ultrasound. This study paves the way for future research aimed at achieving highly efficient singlet oxygen generation
A New Local Path Planning Approach by Synthesis of PRM and RRT* Algorithms for an Autonomous Mobile Robot
Development of novel Phthalocyanine/Graphene oxide Composite: Potential usage for Sono/Photochemical Applications, and the treatment of type-2 diabetes and Alzheimer's disease
In this study, the novel 3-(benzo[d]thiazol-2-ylthio) phthalonitrile (1) as starting material was synthesized and its molecular structure was verified by the experiment of single crystal X-ray diffraction, and it was first brought to the literature. Then, its non-peripherally tetra-thiazol derivative-substituted phthalocyninato gallium (III) chloride compound (GaClPc:2) was synthesized and characterized for the first time. Then, GaClPc-GO composites (2a-2c) were prepared by non-covalent interaction between GaClPc (2) and graphene oxide (GO). All compounds used were characterized with various spectroscopic methods such as UV–Vis, FT-IR, 1H NMR, 13C NMR, SEM and MALDI-TOF MS, Raman. The sonochemical, photochemical and sono-photochemical abilities of the synthesized substances were systematically examined by a comprehensive analysis. The recorded measurements showed that remarkably high quantum yields were obtained after sono-photochemical studies, indicating that these sensitizers could be promising candidate sensitizer molecules for use in pioneering cancer therapies. Then, their effects on several metabolic enzymes were investigated and have been found to be effective inhibition against α-glycosidase, α-amylase, butyrylcholinesterase and acetylcholinesterase. Also, IC50 were found as 5.02 to 11.60 µM for AChE, 12.05 to 36.52 µM for BChE, 48.52 to 64.50 µM for α-amylase, and 31.14 and 39.64 µM for α-glycosidase
Optimization of Process Parameters for Out-of-Autoclave Thermoplastic Composite Manufacturing
Discourse markers in Shajara-i Tarākima
Shajara-i Tarākima, transcribed in Classical Chagatai Turkic by Abu al-Ghazi Bahadur Khan during the 17th century, is one of the most significant works in Turkology studies. Since the 19th century, it has garnered substantial interest among Turkology researchers from various nations, becoming the subject of numerous scholarly investigations. However, these studies have primarily focused on critiquing and revising the previous researchers’ works, overlooking the characteristics of spoken language present in the text. Nevertheless, considering that the fundamental basis of the work lies in oral narratives, it is evident that the text incorporates abundant features of colloquial language. Therefore, a pragmatic evaluation of the Shajara-i Tarākima is crucial to better comprehending and interpreting the work. This study analyzes the discourse markers in the Shajara-i Tarākima to achieve this purpose. The research builds upon the new model proposed by Crible and Degand (2019), which identifies discourse markers based on their combination of domain and function. The study asserts that in intralingual or interlingual translations of historical texts containing features of colloquial language, discourse markers play a vital role in ensuring the accurate transfer of meaning
Digital robust nonlinear controller for position and attitude stabilization of an autonomous quadrotor unmanned aerial vehicle
Unmanned aerial vehicles, which are aircraft without human pilots or passengers on board, expanded to many applications as digital control technologies improved and costs fell. However, the highly nonlinear dynamics in these systems cause traditional methods to be inadequate, so the importance of nonlinear control methods for these systems has increased. This study focuses on nonlinear stabilizing control of an autonomous quadrotor UAV based on an approximate dynamical model. Position and attitude digital controllers are designed using a backstepping controller with integral action directly in the discrete-time domain. Firstly, the discretized dynamics of the quadrotor are introduced. Due to the underactuated structure of autonomous quadrotor UAVs, the digital controllers are designed to track the altitude positions and yaw angle of the quadrotor to their reference trajectories, while also stabilizing the pitch and roll angles. In the design procedure, position controllers automatically generate the desired trajectories of pitch and roll angles. Robustness against parametric deviations, unmodeled dynamics, and external disturbances is achieved with integral action, thus ensuring an offset-less steady-state response. The asymptotic stability of the closed-loop system under the proposed controllers is demonstrated according to Lyapunov theory. Detailed simulation results, along with comparative studies, are presented to illustrate the effectiveness and feasibility of the proposed controller
Evaluation of surface properties of modified Ti6Al4V alloy with copper nanoparticles organic nanostructure for biomedical applications: Dependency on anticorrosive, antibacterial, and biocompatibility
In this study, a novel multifunctional copper nanoparticle CuNPs in the organic biomatrix was coated to the surface of Ti6Al4V to create multifunctional features. The synthesis of CuNPs was carried out by plant-mediated green synthesis method obtained from Moringa leaf extract, and the prepared CuNPs were coated on the substrate surfaces as single and double layers with drop casting methods. Characterizations of the synthesized CuNPs were performed by UV-Vis, FTIR, XRD, and SEM methods. Characterization of the modified Ti6Al4V alloy surfaces was performed using SEM-EDS and surface roughness analysis. The electrochemical corrosion, antibacterial behavior, and cytotoxic effects of coated and noncoated Ti6Al4V as a function of biocompatibility properties were also tested. The synthesized CuNPs have a homogeneously dispersed spherical shape. Biocorrosion tests have clearly demonstrated that the coating forms a protective film on the substrate surface, and the resistance increased by 49%. Antibacterial results show that the single and double-coated Ti6Al4V alloy samples with CuNPs organic nanostructure had improved biocompatibility. However, it was determined that the cytotoxic effect increases proportionally with the coating. The obtained results show the importance of surface modification in the appropriate nanostructure to obtain multifunctional nanoplatforms that show promise in biomedical applications
Constraints on the Higgs boson self-coupling from the combination of single and double Higgs boson production in proton-proton collisions at s=13TeV
The Higgs boson (H) trilinear self-coupling, λ3, is constrained via its measured properties and limits on the HH pair production using the proton-proton collision data collected by the CMS experiment at s=13TeV. The combination of event categories enriched in single-H and HH events is used to measure κλ, defined as the value of λ3 normalized to its standard model prediction, while simultaneously constraining the Higgs boson couplings to fermions and vector bosons. Values of κλ outside the interval −1.2<κλ<7.5 are excluded at 2σ confidence level, which is compatible with the expected range of −2.0<κλ<7.7 under the assumption that all other Higgs boson couplings are equal to their standard model predicted values. Relaxing the assumption on the Higgs couplings to fermions and vector bosons the observed (expected) κλ interval is constrained to be within −1.4<κλ<7.8 (−2.3<κλ<7.8) at 2σ confidence level