Faculty of Engineering
http://hdl.handle.net/10679/10
2024-03-28T19:05:51ZAnalysis of X(4140) like states and their radial excitations in QCD
http://hdl.handle.net/10679/9327
Analysis of X(4140) like states and their radial excitations in QCD
Türkan, Arzu; Dağ, Hüseyin
In this work, we investigated the X(4140) and like states and their radial excitations by using molecular and diquark-antidiquark currents which couple to scalar, axial vector and tensor states via QCD sum rules. In operator product expansion, we considered quark, gluon and mixed vacuum condansates up to dimension eight. For the ground states coupling to these currents, we found that masses are almost degenerate with X(4140). For the excited states, we found that scalar and tensor currents are coupling to D∗ sD∗ s threshold. However for the axial vector currents, the mass of the first excited state is compatible with X(4274). Thus we conclude that, X(4274) might be the first radial excitation of X(4140).
2017-01-01T00:00:00ZTheoretical analysis of magneto-inductive THZ wireless communications and power transfer with multi-layer graphene nano-coils
http://hdl.handle.net/10679/9325
Theoretical analysis of magneto-inductive THZ wireless communications and power transfer with multi-layer graphene nano-coils
Gülbahar, Burhan
Graphene with significant potentials in diverse areas of physical and biological sciences is proposed as a solution to complementary problems of semiconductor and biomedical industries, i.e., the on-chip (OC) interconnect bottleneck and in-body (IB) wireless communications/power transfer (PT), respectively. Emerging nanoscale solutions with radio frequency, optical, ultrasonic, or molecular channels in OC and IB media have various challenges including achievable footprints and frequency, energy consumption, medium dependent features, and interference. In this paper, major challenges are addressed with magneto-inductive (MI) transceivers by combining the advantages of THz operation frequency, unique features of intercalated multi-layer graphene (MLG) coils and range extension with MI waveguides. Our design promises scalable and high performance solutions for the OC interconnect bottleneck while providing biocompatible and universal solutions for challenging IB medium. The proposed solution is theoretically analyzed and numerically compared with the copper-based alternatives, and the practical challenges are discussed. Simulation results achieve high capacity (several Tbit/s) and ultra-low power (500 zJ/bit) wireless communications while providing high (hundreds of kWs) and efficient (109 W/mm2) wireless PT at several millimeters. In addition, unique properties of MLG such as lightweight structure, biocompatibility, current carrying capacity, and planar manufacturability make the solution more promising for challenging environments.
2017-03-01T00:00:00ZNetworking standards
http://hdl.handle.net/10679/9324
Networking standards
Beğen, Ali Cengiz; Bök, P. B.; Saltsidis, P.
The article in this special section focus on the market for new networking technologies. Networking technologies are advancing faster than ever before. Aspects driving this change in velocity is the need to support faster, more reliable, ubiquitous services with an ever-increasing scale over the communications infrastructure. This is causing a shift from traditional standards development to a hybrid approach that includes open-source development techniques, tooling, and full lifecycle management. Keeping pace with the changes to the standards ecosystem and evolution of the way networks are built and deployed is challenging. Additionally, the Internet of Things (IoT) is one of the main drivers which, on the one hand, increases the number of connected communicative components, and on the other hand pushes the development of a huge amount of standards.
2017-03-01T00:00:00ZMulticore energy efficient scheduling with energy harvesting for wireless multimedia sensor networks
http://hdl.handle.net/10679/9323
Multicore energy efficient scheduling with energy harvesting for wireless multimedia sensor networks
Jamshed, M. A.; Amjad, Osama; Zeydan, E.
Wireless Multimedia Sensor Networks (WMSNs) are becoming one of the latest trends in the Internet of things. However, in WMSNs the energy constraint is a significant issue. In this paper, an idea of integrating energy harvesting technique with energy efficient scheduling mechanism is proposed. In order to increase the overall energy efficiency, the previously studied scheduling algorithm is used and integrated with a multi-core processor technique. Since increasing the number of cores in a processor decreases the overall energy efficiency, integration of energy harvesting with the processor can alleviate energy loss. The proposed idea constitutes of implementing the technique of lightweight processor (LWP) on a first core and leaving the second core in idle state with multiple lightweight processor implementation. The second core is divided into two parts namely, the main part and the multiple LWPs. The main part of the second core is used to relieve the processing speed issue and the multiple LWPs are used to cover up the flaws of missing deadlines if the number of tasks are increased. The second core comes in operation when the battery capacity is above 50%, using the RF energy harvesting scheme. This method increases the overall energy efficiency of each sensor node from 38% to 60% compared to the single core and single LWP method.
2017-07-02T00:00:00Z