Abstract: Cellular base station antenna concealments, such as palm and tree concealments, utilize artificial branches with nonmetallic (e.g., polymeric) interfaces to avoid loose metal-to-metal connections to mitigate the generation of passive intermodulation (PIM) interference by the branches. Representative embodiments include “palm concealments” with low-PIM artificial palm fronds, and “tree concealments” with low-PIM artificial tree branches. That is, “low-PIM fronds” and “low-PIM tree branches” are two representative examples of “low-PIM branches” illustrating representative embodiments of the invention. The low-PIM palm frond includes a nonmetallic (e.g., polymeric) sleeve positioned between a metal frond shaft and a metal frond receiver. A first example of the low-PIM tree branch includes nonmetallic (e.g., polymeric) fastener isolators positioned between metal fasteners and a metal tree branch receiver. A second example of the low-PIM tree branch includes a nonmetallic (e.g.

Abstract: A mass flowmeter employing thermal dispersion technology, and method for determining mass flow of a fluid throughout a range beyond that which possible for a constant ?T instrument at increasing power, and below that with which a constant power instrument can provide rapid ?T readings.

Abstract: A mass flowmeter employing thermal dispersion technology, and method for determining mass flow of a fluid throughout a range beyond that which possible for a constant ?T instrument at increasing power, and below that with which a constant power instrument can provide rapid ?T readings.