LUMIO, a Lunar Meteoroid Impacts Observer

Accurate models of the distribution of meteoroids in the Earth-Moon system are needed to predict impacts with space equipment and for safe space exploration. The Moon\u27s lack of atmosphere allows for observation of meteoroid impacts: understanding meteoroids is important for studying asteroids, comets, and near-Earth objects. The Lunar Meteoroid Impacts Observer (LUMIO) is a CubeSat mission designed to detect and characterize meteoroid impacts on the far side of the Moon. It can detect small meteoroids too faint for Earth-based observations. LUMIO operates in a Halo orbit at Earth-Moon L2 using the LUMIO-Cam, an optical instrument detecting visible light flashes. The mission is developed under ESA\u27s General Support Technology Program Fly Element. This work highlights the technical challenges and innovative solutions for the LUMIO platform, designed to meet scientific experiment requirements. The satellite will perform a transfer through a Weak Stability Boundary (WSB) trajectory to reach its final orbit. During nominal operations, LUMIO will detect meteoroids for half the lunar month when the Moon is not completely illuminated. The remaining time will be dedicated to station keeping, orbit determination, and optical navigation using an innovative approach. LUMIO features high-reliability technologies to ensure mission success despite mass, volume, power, and cost constraints

[Aneurysms of the splanchnic arteries].

Although visceral aneurysms usually have an asymptomatic course, ruptures associated with high mortality do occur. When an asymptomatic lesion is found, the physician must decide whether it should be treated surgically and which surgical technique should be used. Because this type of aneurysm is relatively rare, the answer to these questions have not been determined previously. The outcome in 16 patients treated by surgical or embolization procedures was evaluated. A group of 16 patients with visceral aneurysms were observed in our institution between 1987 and 1993. Localization of aneurysms was on the splenic artery in 8 cases, renal artery in 4 cases, hepatic artery in 3 patients and superior mesenteric artery in one patient. Hypertension was related to renal aneurysms and angina abdominis to the patient with superior mesenteric artery aneurysm. Of the 16 patients, 8 (6 splenic and 2 hepatic aneurysms) were asymptomatic, 3 (2 splenic and 1 hepatic) were treated as an emergency because they presented with shock. In the splenic group (8 cases), 2 patients underwent embolization procedures with Gianturco's coils, and 6 surgical procedures; in the hepatic group 1 embolization and 1 surgical procedure were performed; and finally in the renal and mesenteric group surgical reconstruction was performed during aortic prosthetic surgery. Because of well documented natural history of progressive enlargement and eventual rupture, the aneurysms of visceral arteries should be corrected surgically when the diagnosis is confirmed by vascular imaging (ultrasounds, CT, RM, angiography). Ruptures are treated with emergency operations, when possible. In high-risk patients, non operative management by selective embolization (in case of splenic and hepatic aneurysms) may be suitable alternative

HIV and surgery: An issue only for developed country? an overview from Mozambique

The high incidence of HIV, especially in sub-Saharan African countries, and the increase of life expectancy due to effectiveness antiretroviral therapies, have led to an increase of patients undergoing surgery interventions. To date there is still no definitive data on role, outcome and management of HIV positive surgical subjects. This paper reviews the more recent literature about HIV infection, highlighting the main pathologies treated by thoracic, abdominal and orthopedic surgery, without forgetting about other surgery branches. Particular attention was paid to Mozambique, a developing country with one of the highest levels of HIV incidence