The main symptoms of vascular dementia include: 1  Abrupt onset (in some, but not all patients). 2  Progressive deterioration of intellectual abilities, processing speed, cognitive and motor abilities. 3  Progressive memory loss. 4  Slow, unsteady gait. 5  Fluctuating course (in some patients).
Although radio frequency is a rate of oscillation, the term radio frequency or its abbreviation RF are used as a synonym for radio â i.e., to describe the use of wireless communication, as opposed to communication via electric wires. The energy in an RF current can radiate off a conductor into space as electromagnetic waves (radio waves); this is the basis of radio technology. 2  RF current does not penetrate deeply into electrical conductors but tends to flow along their surfaces; this is known as the skin effect.
RF and microwave power measurement and RF and microwave power meters are important elements within the RF and microwave design arena. The output power level of many RF and microwave amplifiers is a critical parameter in the design.here are two main types of RF power meter that are used: 1  Through-line RF power meters: These RF power meters take a sample of the power flowing along a feed-line and use this to indicate the power level.