EMR-transmissive window assemblies comprising an EMR-transmissive substrate mounted in a substantially rigid framework structure and sealed to the metallic framework structure by means of a ceramic material having a partially amorphous and partially crystalline structure are disclosed. Each of four corners of the kite are secured to one of four cords respectively, permitting a user to maneuver the kite while the kite is in flight. When the first LED is turned on, the second LED turns on for a first time period and senses lighting intensity of the first LED for a second time period to generate a sensing signal. The hybrid proteins are useful as food ingredients. Reliable blood pressure values are obtained without additional cost to the user, by obtaining an evaluation criterion for the presence of haemodynamic stability from the individual pulse oscillogram, the determination of the blood pressure value or the determined blood pressure value being related to the criterion.