A method and apparatus for improving the thermal conductivity of a circuit board assembly comprising an integrated circuit die mounted on a CB. The process entails providing a mass of powder comprising a quantity of filler particles of a metallic composition, and subjecting the mass to microwave radiation so that the filler particles within the mass couple with the microwave radiation and are completely melted. Thus, parts of the biological matter having different H2O17 concentrations are differentiated because of their different T2T1 ratios. When the state of the door detected by the open and close detection sensor switches from the open state to the closed state, a closed-state person detection information recorder records whether the person detector is detecting a person or not. The invention further relates to biocide compositions which comprise 2-methyl-4-isothiazolin-3-one andor octyl-4-isothiazolin-3-one and also one or more odor preventatives, and to the use of odor preventatives for preventing ghost odor. Such an arrangement of the hood latch assembly provides a sufficient space between the safety lever and the hood to reduce any impact on a human body when a pedestrian collides with a hood of the vehicle.