T2 * relaxation refers to the decay of transverse magnetization seen with gradient-echo (GRE) sequences. T2 * relaxation is one of the main determinants of image contrast with GRE sequences and forms the basis for many magnetic resonance (MR) applications.2 * is shorter than T2 (Fig 1), and their relationship can be expressed by the following equation (3), where Î³ is the gyromagnetic ratio: 1/T2 * = 1/T2 + Î³ Î´B inhom, or 1/T2 * = 1/T2 + 1/T2â², where 1/T2â² = Î³ Î´B inhom, and Î´B inhom is the magnetic field inhomogeneity across a voxel.
Simpler answer: Energy used per day is measured in watt-hours, or more usually kilowatt-hours, and a typical house might use 35 kilowatt-hours per day. That is equal to 1.458 kilowatt-hours per hour, in other words an average power of 1.458 kilowatts.
Divide the result by 1,000 to convert watts to kilowatts. So for example, if your large window fan is rated at 250 watts and you use it 5 hours a day, its kWh use per day is 250 (watts) * 5 (hours used per day) / 1,000 (to change watts into kilowatts) = 1.25 kWh per day.ultiply the unit's kWh/day by the number of days you'd use it during the period you'd like to calculate. So to estimate an appliance's energy use in kWh per month, multiply its kWh/day by 31 (or 28, 29 or 30 depending on how many days there are in the month you want to measure).