A phase detector generates a phase dependent control signal according to the phase relationship between a first and second clock signal. In one particular embodiment, the techniques may be realized as a system for generating high-yield fungi production, the system comprising at least one modular container and a growing system housed within the modular container. The flexible element is arranged to move from at least a first configuration to a second configuration via bending of the flexible element. The heat sink layer 24 is made of a material having a certain range of thermal conductivity, e. The container sleeve or pressure sensitive tape substrate can be advantageously employed with conventional thermally imaging record materials in the form of a label, such as used on prescriptions, to facilitate preserving patient information confidentiality by obscuring information when contacted with microwave energy.