Mühendislik Fakültesi / Faculty of Engineering: Recent submissions
Now showing items 221-240 of 289
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On the eigenvalues and eigenvectors of a lorentzian rotation matrix by using split quaternions
(Advances in Applied Clifford Algebras, 2014)In this paper, we examine eigenvalue problem of a rotation matrix in Minkowski 3 space by using split quaternions. We express the eigenvalues and the eigenvectors of a rotation matrix in term of the coefficients of the ... -
On focal curves of null Cartan curves
(Turkish Journal of Mathematics, 2017)The focal curve, which is determined as the locus of centers of osculating pseudo-spheres of a null Cartan curve, is investigated in Minkowski (n+2)-space Mn+2. Moreover, a curve called acceleration focal curve of a null ... -
Rotations on a lightcone in minkowski 3-Space
(Advances in Applied Clifford Algebras, Springer, 2017)In this paper the generalization of the rotations on any lightcone in Minkowski 3-space ℝ1,2𝑔 is given. The rotation motion on the lightcone is examined by means of a bilinear form and Lorentzian notions. We use the ... -
Optimization of hydrothermal synthesis of Ce3+ co-doped NaYF4, Yb3+, Er3+upconversion nanoparticles and investigation of their size, morphology, and phase transitions.
(ICENS, 2019)In this study, the synthesis of water-soluble polyethyleneimine (PEI) modified UCNPs which were prepared by a hydrothermal method have been reported. The resultant UCNPs were small size and hexagonal β-phase structure ... -
Multifunctional magnetic nanocarrier: synthesis, characterization and pH-responsive doxorubicin release profile
(2019)In this study, carboxymethyl cellulose (CMC) functionalized superparamagnetic iron oxide nanoparticles (SPIONs) have been synthesized as a novel theranostic platform which enables magnetic resonance (MR) imaging-guided and ... -
Evaluation of reinforcing bars ratio effects on SCC beam-column joint performance
(Uludağ University Journal of The Faculty of Engineering, 2019)Beam-column joints require a high ductility during the unexpected loadings that necessitate the need for ductile concrete in such unprotected locations. Alternatively, self-compacting concrete (SCC) is a sort of concrete ... -
Seismic retrofit of full-scale substandard extended rectangular RC columns through CFRP jacketing: test results and design recommendations
(Journal of Composites for Construction, 2019)Brittle behavior of substandard columns during earthquakes is among the most common reasons of structural failures. Because capacity design principles and ductile detailing concepts have not been properly adopted during ... -
Number of design gyrations for 100 mm compacted asphalt mixtures modified with polypropylene
(Journal of Engineering Research, 2018)There is no standard accepted by highway authorities on the compaction procedures of 100 mm diameter gyratory compactor specimens. In previous studies on gyratory compaction, the utilisation of either coring from 150 mm ... -
Relationship between traffic density and pavement deflections
(Université d'Evry / Université Paris-Saclay, 2019)Traffic density is one of the most important parameters to consider in road construction. The presence of different components in road construction makes it essential to know the individual layer and inter-layer behaviors. ... -
Recurrent process on appointing an aid site: a case for airports
(Université d'Evry / Université Paris-Saclay, 2019)Mathematical models have been used for many decades in order to improve the infrastructure design of transportation facilities. In this study, locational best fit airport infrastructure is determined for providing an urgent ... -
Transfer entropy
(MDPI AG, 2018)Statistical relationships among the variables of a complex system reveal a lot about its physical behavior. Therefore, identification of the relevant variables and characterization of their interactions are crucial for a ... -
Effects of neuronal noise on neural communication
(Proceedings, 2019)In this work, we propose an approach to better understand the effects of neuronal noise on neural communication systems. Here, we extend the fundamental Hodgkin-Huxley (HH) model by adding synaptic couplings to represent ... -
An integrated permanent magnet Micro-turbo- generator supported on microball bearings
(Journal of Microelectromechanical Systems, 2013)This paper presents the design, fabrication, and testing of an integrated microturbogenerator utilizing permanent magnets and microball bearings. The key components of this generator are the following: 1) a silicon ... -
Monitoring of actuation conditions in a micro- turbo-generator
(IEEE Sensors Journal, 2013)This paper presents the theory and implementation of an integrated sensing technique for the real-time measurement of applied actuation conditions in a micro-turbo-generator. The device is composed of a microturbine rotor ... -
An adhesion-dominated rolling Friction regime unique to micro-scale ball bearings
(Tribology Letters, 2014)We demonstrate that micro-scale rolling bearings exhibit friction and wear properties markedly different from their macro-scale counterparts. A microfabricated testing platform uses variable rolling element diameters or ... -
An investigation on the electromagnetic design optimization of rotary micromachines with double-layer permanent magnets
(Sensors and Actuators A: Physical, 2015)Electromagnetic design optimization of axial-flux rotary micromachines utilizing double-layer permanent magnets is presented and applied to a micro-scale generator/spirometer currently under development. Double-layer magnet ... -
The development and performance characterization of turbine prototypes for a MEMS spirometer
(IEEE Sensors Journal, 2016)The design, optimization, and performance characterization of turbine prototypes for the development of a Microelectromechanical Systems spirometer is reported. Four different turbines were designed based on large-scale ... -
A non-resonant kinetic energy harvester for bioimplantable applications
(Micromachines, 2018)A linear non-resonant kinetic energy harvester for implantable devices is presented. The design contains a metal platform with permanent magnets, two stators with three-dimensional helical coils for increased power generation, ... -
Energy harvesting from knee motion using piezoelectric patch transducers
(Academic Platform Journal of Engineering and Science, 2019)This paper presents a piezoelectric energy harvesting device that generates electrical power from knee motion during human gait. The device is composed of two MEMS-based piezoelectric patch transducers optimized for placement ... -
Hybrid magnetic-piezoelectric energy harvester for power generation around waistline from gait
(Journal of Electrical Engineering & Technology, 2019)The development of a novel hybrid energy harvester for scavenging power around human waistline is presented. The harvester is composed of mm-scale electromagnetic coils and piezoelectric transducers incorporated on a belt, ...
