No abstract

Results from SMART-1 plasma measurements indicate that the spacecraft is, in general, floating 10 to 30 V negative with respect to the ambient plasma and that the floating potential varies with the orientation of the solar array with respect to the direction of the thrust. It is shown in this paper that a wake created behind the solar panel by the plasma generated in the plume by charge exchange and expanding toward the spacecraft may explain such a potential variation.Index Terms-Space vehicle power system, space vehicle propulsion.

Inductive energy storage driven vacuum arc thruster Rev. Sci. Instrum. 73, 925 (2002);

No abstract

Hypertension management forms a cornerstone of cardiovascular prevention. Strong evidence is available supporting the benefits of blood pressure (BP) lowering in older adults, and recent studies indicate that intensive BP control may provide additional advantages concerning cardiovascular and mortality risk, also at older ages. Yet, in older adults, the cardiovascular benefit of intensive treatment may come at the expense of an increase in adverse events. Indeed, advanced age and frailty may modify the risk/benefit ratio of BP lowering due to a greater predisposition to hypotension and more severe consequences deriving from treatment-related adverse effects. This mostly applies to individuals with poor health status and limited life expectancy, in whom aggressive BP lowering may not lead to cardiovascular benefits but rather increase the risk of short-term treatment-related complications. Furthermore, potential harms of intensive BP control might be underestimated in clinical trials due to exclusion criteria that preclude patients with frailty and multimorbidity from being eligible. Syncope and falls are the most frequently mentioned safety concerns related to antihypertensive treatment, but aggressive BP lowering may affect negatively also renal function, cognitive performance, quality of life, and survival. With the growing emphasis on intensive treatment strategies, raising the awareness of potential harms associated with aggressive BP lowering might help improve hypertension management in older adults and encourage implementation of clinical research on safety. Given these premises, we present a narrative review illustrating the most relevant risks associated with intensive BP control in older patients.