Sökning: "narrow-band"
Visar resultat 1 - 5 av 75 avhandlingar innehållade ordet narrow-band.
1. Density functional calculations of optical spectra and narrow band systems
Sammanfattning : A calculational method, based on density functionaltheory, has been used to calculate optica spectra for a wide range of systems,as well as ground-state properties of some narrow-band systems. A systematic study of the trends in the optical properties of the 4Brefractory metal compounds has been performed. LÄS MER
2. Fatigue Assessment and Extreme Response Prediction of Ship Structures
Sammanfattning : In this thesis, a simplified narrow-band approximation model is proposed to estimate fatigue damage of ship structures, and an efficient method for extreme response predictions is also developed using upcrossing spectrums of ship responses. The proposed fatigue model includes two main parameters, significant stress range hs and zero upcrossing frequency fz. LÄS MER
3. Interference Rejection in Wireless Communication Systems
Sammanfattning : This thesis is concerned with the problem of interference rejection in wireless communication systems. Different solutions are proposed, depending on the type of system under study and the amount of knowledge available about the signal and the propagation environment. LÄS MER
4. High Temperature Superconducting and Tunable Ferroelectric Microwave Devices
Sammanfattning : This thesis addresses some applications of High Temperature Superconductors (HTS) and ferroelectric materials in tunable microwave devices and circuits. The work is divided into three main areas: i) modeling of multilayered structures including ferroelectric layers, ii) realization and characterization of tunable coplanar waveguides (CPW), capacitors and resonators based on ferroelectrics, and iii) an investigation of microstrip HTS K-band filters. LÄS MER
5. Printable Green RFID Antennas for Embedded Sensors
Sammanfattning : In the recent years, radio-frequency identification (RFID) technology has been widely integrated into modern society applications, ranging from barcode successor to retail supply chain, remote monitoring, detection and healthcare, for instance. In general, an RFID tag or transponder is composed of an antenna and an application-specific integrated circuit chip. LÄS MER