Abstract: An engine testing device for dynamic pressure loss and valve seal-tightness testing of a running four-stroke engine includes: a first pressure gauge detecting a pressure value in an air intake line to a cylinder of the engine and outputting a first output signal indicative of the pressure value detected; a second pressure gauge detecting a pressure value in an exhaust line of the engine and outputting a second output signal indicative of the pressure value detected; a trigger device detecting an electrical signal indicative of when a selected cylinder of the engine is the particular active cylinder; and a measured value detection device detecting the output signals of the first and second pressure gauges and an output signal of the trigger device, such that an association between points in time of the pressure measurements and the particular active cylinder is enabled.

Abstract: An engine testing device for dynamic pressure loss and valve seal-tightness testing of a running four-stroke engine includes: a first pressure gauge detecting a pressure value in an air intake line to a cylinder of the engine and outputting a first output signal indicative of the pressure value detected; a second pressure gauge detecting a pressure value in an exhaust line of the engine and outputting a second output signal indicative of the pressure value detected; a trigger device detecting an electrical signal indicative of when a selected cylinder of the engine is the particular active cylinder; and a measured value detection device detecting the output signals of the first and second pressure gauges and an output signal of the trigger device, such that an association between points in time of the pressure measurements and the particular active cylinder is enabled.

Abstract: An antireflection coating for a solar cell includes at least a first SiNx layer with a high refractive index and a second SiNx layer with a lower refractive index. An improved light coupling and a better passivation of solar cells and a more homogeneous and darker color impression may be achieved also in the laminated in solar module, while at the same time being insensitive to typical process variations.

Abstract: A solar cell includes a semiconductor substrate and an antireflection layer arranged on the light incidence side on the front-side surface of a semiconductor substrate. The antireflection layer has a limit voltage of less than 10 volts, less than 5 volts, or less than 3 volts, along a layer thickness of the antireflection layer.