Siemens Aktiengesellschaft

Oliver Pfaff

Lothar Hofmann

Wieland Mathes

Udo Klumpp

A method for access control to computer-controlled programs, which can be used at the same time by a plurality of users. A user sends a request regarding a program to a unit for organizing a data flow. It is checked in this unit whether the user which sent the request, has originally started the program. When the user sending the request has started the program, the request is forwarded to the program. If not, an access control with respect to the request is carried out on the basis of an access control data bank. When it derives from the access control that the request is an allowed request, the request is forwarded to the program. When it derives from the access control that the request represents an unallowed request, the request is not forwarded to the program.

Process for access control to computer-controlled programs usable by several user units at the same time

A premixing chamber of a nebulizing device for an exhaust gas purification system serves to mix a compressed gas such as compressed air, for example, with a reducing agent such as urea solution, for example. The premixing chamber is set up on the carburetor principle and includes a compressed gas feed having a taper and a reducing agent feed opening in the region of the taper. The premixing chamber ensures that no deposits originating from the reducing agent can settle in the region of the mixing route. The premixing chamber is provided, in particular, for an exhaust gas purification system of a vehicle fitted with a regulated diesel catalytic converter as well as for stationary diesel engines of up to about 1000 kW (mechanical power).

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Berlin, Germany

Oliver Pfaff