Abstract: Airborne pathogen mobility and the airborne mobility of respiratory droplets, such as saliva, and testing thereof, can be monitored by tracking detectable compounds and measuring concentrations.

Abstract: Airborne pathogen mobility and the airborne mobility of respiratory droplets, such as saliva, and testing thereof, can be monitored by tracking detectable compounds and measuring concentrations. A display can be presented including a building layout and simulant concentrations released and collected at various locations within a space.

Abstract: An inverter type drive unit for feeding AC electric power of variable parameters to an electric motor has an electronic control section, and a power converting and output section which includes one or more identical power modules, each forming a complete 3-phase output stage. The power modules are arranged side-by-side in a multiplying direction and are clamped by retaining devices to a cooling structure. The power modules are connected in parallel to DC input terminals and to AC output terminals via conductive sheets which are insulated from each other. The DC connected conductive sheets cover substantially the entire physical surface area covered by the power modules so as to accomplish an even, simultaneous and low impedance DC current supply to all power modules.

Abstract: An inverter type drive unit for feeding AC electric power of variable parameters to an electric motor comprises an electronic control section (40), a power converting and an output section comprising one or more identical power modules (11a-c), each forming a complete 3-phase output stage and arranged in a side-by-side disposition in a multiplying direction (A) and clamped by means of retaining devices (14a-c) to a cooling structure (10), wherein the power modules (11a-c) are connected in parallel to DC input terminals (25, 26) and to AC output terminals (32, 33, 34) via conductive sheets (20, 21, 27a-c), whereof the DC connected sheets (20, 21) cover substantially the entire physical surface area covered by the power modules (11a-c) so as to accomplish an even, simultaneous and low impedance DC current supply to all power modules (11a-c).

Abstract: A tennis racket and a method of manufacturing same are disclosed. The racket comprises two half-frame members each provided with a respective generally annular portion defining a rim element of the racket, and also provided with a handle portion connected to the respective generally annular portion. The face of the racket is formed by a plurality of tensioned strings clamped between the annular portions to define a netting. The netting is secured to each of the rim elements of the respective half-frame members by binders, which also secure the two rim elements to one another. The strings are subjected to tension by a tensioning device before the two rim elements of the racket are pressed together to clamp the strings therebetween and the strings are secured to the rim elements and the latter to one another by binders, which have been applied to at least the mutually facing surface portions of the rim elements prior to their being pressed together.