Analysis of the Ordinary and Extraordinary Ionospheric Modes for NVIS Digital Communications Channels.

Sensor networks have become more popular in recent years, now featuring plenty of options and capabilities. Notwithstanding this, remote locations present many difficulties for their study and monitoring. High-frequency (HF) communications are presented as an alternative to satellite communications, being a low-cost and easy-to-deploy solution.

Hybrid Repair of Type B Aortic Dissection With Thoracoabdominal Aortic Aneurysmal Degeneration in the Setting of Marfan Syndrome.

Aneurysmal degeneration of the thoracoabdominal aorta after aortic dissection is a well-documented sequela of Marfan syndrome (MFS). Hybrid technique (HT), an emerging treatment modality for complex aortic pathologies, decreases morbidity and mortality relative to open surgery. However, outcome data regarding HT in genetic aortopathies such as MFS is limited.

Ureteral Arterial Fistula - A Role for Open Operation in the 21st Century.

Background: Ureteral arterial fistula is a rare and challenging clinical entity. The diagnosis and management of ureteral arterial fistula present a unique disease process that requires a dual specialty approach, involving both vascular and urologic surgeons. There are different options for repair, including both open and endovascular techniques.

NVIS Multicarrier Modulations for Remote-Sensor Applications.

The number of Internet of Things (IoT) devices has experienced a large growth during the last decade, as well as the data volume gathered from remote sensors. Satellites are still a suitable communication method and may be preferable for a remote ubiquitous sensor network (USN), which sometimes are located in places without much communications infrastructure where coverage is the principal drawback. Alternatively, the proposed solution for this article aims at a near-vertical incidence skywave (NVIS) channel for high frequencies (HF) with a low-cost platform, allowing a low-power transmissions coverage area up to 250 km for USN.

Direct Retrograde Bypass is Preferable to Antegrade Bypass for Open Mesenteric Revascularization.

Background: Mesenteric bypass grafts can be constructed either antegrade or retrograde. There is debate regarding which is the optimal approach. We have modified the technique for retrograde mesenteric revascularization using a direct open retrograde revascularization (DORR) technique.