The diseases have been categorized as patches (cause dead spots or patches in the lawn), rings (cause rings of dead or affected grass), or leaf blight (affect individual blades of grass, often over a wide area and no distinct patch or ring pattern may be noticeable).
PVR, abbreviation for pulmonary vascular resistance. To measure changes in blood vessel size or changes in gas volume in the lungs to assist in diagnosing diseases such as deep vein thrombosis (DVT), chronic obstructive pulmonary disease (COPD), and some peripheral vascular disorders. Veins, arteries, and lungs. None.
In the meantime, this information will help the newcomer understand the basic concept. SWR is the common abbreviation for Standing Wave Ratio. It may, in some circles, be referred to as VSWR (voltage standing wave ratio). Never the less it is the same. For the most part the term has been reduced to SWR since the calculation can involve either voltage or current.