A 63-year-old woman with COPD presented to our hospital with complaints of breathlessness on exertion, productive cough and weight loss.Chest X-ray showed a bright silhouette extending from the aortic knob in the right paratracheal area on the PA-view and a posterior indentation of the tracheal air column on the lateral Drinkware view.No other abno
In the paper, a wideband miniaturized impedance-transforming quadrature four-feed network with a flat output phase difference is presented and applied to the design of an active integrated GNSS antenna where no extra impedance matching circuit is needed.The features of impedance transformation and flat output phase difference are achieved by the pr
Cognitive radio networks (CRNs) have been widely used in various applications for effective radio spectrum utilization in recent years.It is essential to fend off the growing demand for this finite natural resource for next-generation communications.In CRNs, detecting the activity of the primary user requires opportunistic spectrum sensing for effi