Abstract: The disclosure provides a tracer composition. The composition comprises a fluorescent molecule which fluoresces when exposed to an excitation wavelength, and thereby emit a photon with a wavelength between 400 and 600 nm; and a gelling agent.

Abstract: The disclosure provides a tracer composition. The composition comprises a fluorescent molecule which fluoresces when exposed to an excitation wavelength, and thereby emit a photon with a wavelength between 400 and 600 nm; and a gelling agent.

Abstract: A multi-layer construct is provided for simultaneously displaying old and new product information. The construct includes a liner that has removable and permanent portions. A removable adhesive is an ultraviolet-resistant adhesive that is applied to a front surface of the first portion of the liner and a permanent adhesive is applied to a front surface of the second portion of the liner. A transparent film is secured to the removable adhesive and a printable label is secured to the permanent adhesive. The first portion of the liner can be separated from remainder of the construct so that the transparent film can be applied removably over the old product information. The new product information can be printed on the printable label.

Abstract: A system and method for communications in a mine provides for seismic wave generation through mine strata which may include specific location identification within the mine can be used in emergency situations by trapped miners. A seismic transmitting transducer may impart seismic waves onto a rod embedded into the strata, which is tunable by use of a slideable manifold that couple the transducer to a rod. Likewise, a receiving transducer which may also be coupled to a rod via a manifold may be configured to receive the seismic wave. The seismic wave may be modulated to produce a message or portion of a message that may be decoded at the receiving location. The transducers may be configured to utilize frequency hopping spread spectrum techniques. A geophone may be used as the receiving transducer.