Vascular dementia is a cause of dementia. It is caused by disease of the small blood vessels in the brain. Parts of the brain called white matter (as well as subcortical grey matter) are injured by multiple small strokes. Healthy and Injured Brain Blood Vessels.
The RF part of the electromagnetic spectrum is generally defined as that part of the spectrum where electromagnetic waves have frequencies in the range of about 3 kilohertz (3 kHz) to 300 gigahertz (300 GHz).Probably the most important use for RF energy is in providing telecommunications services.or example, the unit volts per meter (V/m) is used to measure the strength of the electric field and the unit amperes per meter (A/m) is used to express the strength of the magnetic field. RF waves can be characterized by a wavelength and a frequency.
Radio-frequency identification (RFID) is the wireless use of electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information.