Abstract: A method of operating an air purification system (24?) of an ion mobility spectrometer, the method comprising: operating the ion mobility spectrometer in a first sampling mode comprising circulating a flow of air around a closed air circulation system comprising a drift chamber (12) of the ion mobility spectrometer and a first sieve (70) of the air purification system; and operating the ion mobility spectrometer in a first regeneration mode comprising heating the first sieve and circulating a first flow of air through a second sieve (72) of the air purification system and through the drift chamber (12) while passing a second flow of air through the first sieve (70) to an outtake (76).

Abstract: According to one embodiment, a method of managing access to a trading network is provided. A first network login request for a first user is received from a client application. The first network login request includes first authentication information. Based at least on the first authentication information, the first network login request is approved, which authorizes the first user to access the trading network. One or more associated users for which the first user is authorized to act as a proxy is identifying from a plurality of users. User profile information for one of the associated users is obtained and communicated to the client application. The user profile information includes information regarding the second user that can be used to allow the first user to engage in trading activity via the trading network on behalf of the second user.

Abstract: According to one embodiment, a method of managing messages in a trading network is provided. A set of user relationships between a first user and one or more second users authorized to act on behalf of the first user is stored. A trading message regarding a trading order submitted on behalf of the first user is received from a trading system. The trading message is communicated to the first user. Each of the second users is identifying from the set of user relationships. For each of the identified second users, a carrier message is generated that includes the trading message and routing information associated with that second user. For each of the identified second users, the respective carrier message is communicated toward a user application associated with that second user based at least on the routing information included in the respective carrier message.