Abstract: measurement device for monitoring the level of liquefied gas in a canister is described. The device comprises an array of at least three temperature sensors, configured to be mounted externally of the canister to extend from a first position on the canister to a second position on the canister. The device also comprises detection circuitry for detecting, when gas is released from the canister causing a temperature drop at the liquid-gas interface within the canister, a subset of the temperature sensors measuring a lower temperature than the remainder of the temperature sensors, and for identifying a current level of the liquefied gas in the canister based on the position within the array of the subset of the temperature sensors detected as measuring a lower temperature. This arrangement can be retrofitted to any canister, without the need to modify the canister or change the valve arrangement.

Abstract: Multiple architects may concurrently create and modify a model of computer software, each on their own client at a different location. Each change that is made to a model is forwarded to a server for analysis. The server may determine whether the change creates a conflict. If no conflict is detected, the change may be approved, saved, and propagated by the server to all of the other clients that are working on the same model. If a conflict is detected, on the other hand, the change may not be approved by the server. The server may instead provide notice of the conflict.