A method and a Radio Signature Positioning Determining Entity are provided for maintaining the reliability of a location database of the RS-PDE. Also disclosed are articles prepared from the composition. The web servers may provide responses using the Internet Cache Protocol. The interpolations are performed through cubic spline interpolation or any other interpolation techniques or low-pass filtering operation. A further improvement is also achieved by applying a compensation coating to at least one optical element of the objective. The system is engaged and disengaged through the interaction of the various tapered surfaces and the nuts, caused by the directional rotation of the nuts.