The invention relates to tricyclic aromatics of the general formula Iin which A1, A2, A3, A4, Q1-Q2, R1, R2, X1, X2, X3, Z1, Z2, Z3, Z4, q, r, s, t and u have the meaning indicated, and to the use thereof as components of liquid-crystalline media and to an electro-optical display element containing same. The solid of the present invention comprises an inorganic substance and moieties located on at least one surface of the inorganic substance, wherein said inorganic substance is an inorganic oxide and the surface moiety is selected from the group consisting of \u2014CH2OH, \u2014CH2, \u2014CHCH3, \u2014CH2CH2OH, \u2014C2CH3, \u2014CH2CH2 and \u2014CHCH2. A fertile window is defined with reference to the correlation between folliculogenesis and probe cyclic profiles. The invention is compact with stable performance, low cost for volume production and easy installation without moving parts. A pre-packaged die diced from the semiconductor wafer is mounted to a support wherein the conductive material effects electrical interconnection between the conductive pads on the die and receiving conductors on the support. , by applying heat based on a heat loss characteristic of the substrate during normal processing.