Abstract Aim To assess changes in sexual behaviour among students at a high school in Denmark from 1982 to 2001.Methods An anonymous self-administered questionnaire was used to compare data from three identical cross-sectional surveys performed in 1982, 1996, and 2001.Results Girls: More girls reported their first sexual intercourse before their 16
Research on discharge spark safety of equivalent receiving antenna of underground metal structure
The metal structures distributed in underground coal mine roadways can be equivalent to the receiving antenna to absorb electromagnetic wave energy and release the energy in the form of discharge sparks under specific conditions.The accumulated energy has the risk of igniting explosive gas.In order to solve the problem, the conditions of ignition o
High stretchable and self-adhesive multifunctional hydrogel for wearable and flexible sensors
Ionic conductive hydrogel has recently garnered significant research attention due to its potential applications in the field of wearable and flexible electronics.Nonetheless, the integration of multifunctional and synergistic advantages, including reliable electronic properties, high swelling capacity, exceptional mechanical characteristics, and L