The results of a long-term multiwavelength study the powerful flat spectrum radio quasar 3C 454.3 using {\it Fermi}-LAT and Swift XRT/UVOT data are reported. In $\gamma$-ray band, observations show several major flares when source flux was $>10^{-5}\:{\rm photon\:cm^{-2}\:s^{-1}}$; peak above $141.6$ MeV, $(9.22\pm1.96)\times10^{-5}\:{\rm photon\:cm^{-2}\:s^{-1}}$ observed on MJD 55519.33, corr...

Reflective Impulse Radios: Principles and Design by Yuhui Chen Doctor of Philosophy in Electrical Engineeing and Computer Sciences University of California, Berkeley Professor Jan Rabaey, Chair Emerging wireless sensor networks display a severe asymmetry between the up and down links. An alternative communication architecture, reflective impulse radio, is proposed to address such design challen...

In this paper, a new multilayer six-port circuit using ultra-wideband directional coupler is presented and implemented. The use of the multilayer technology allows having a compact circuit and a very large bandwidth. To validate this concept, a six-port prototype was fabricated and measured. Simulation and measurement results show the proposed six-port circuit can easily operate over an ultra-w...

In this letter, a compact planar ultra-wideband mobile antenna with L-shaped extended ground stubs is presented. The proposed handset antenna consists of two planar meandered monopole radiating elements, i.e., main antenna and auxiliary antenna respectively, located at the diagonal corners of mobile phone printed circuit broad with standard size of 136 × 68mm2. Each radiating element is compose...

Background: The aim of the present study was application of haemoglobin absorption spectroscopy as a distinguishing tool for identification of two haemoglobin types-HbA and HbS. Material and Methods: Millimolar absorptivities of normal adult haemoglobin (HbA) and sickle cell haemoglobin (HbS) were monitored at pH values of 7.2 and 5.0, within the ultra violet and visible spectral range (250-...