In the paper the paradigm of on-line (real-time) computation of parameters of a time series is developed. As an illustration the computation of the time deviation and Maximum Time Interval Error of the time error signal is shown.

According to International Recommendation OIML R 111, the weights of nominal values greater than 1 g may have a cylindrical shape with a lifting knob. Taking into account this kind of shape and that in the case of an automatic comparator, with the maximum capacity of 1 kg, the diameter of weighing pan is quite small for placing a group of weights from 500g to 100g, the subdivision method can’t be applied for the calibration of weights.
By using the subdivision method presented in this paper, the cylindrical weights with a lifting knob, having nominal values from 500g to 100 g are calibrated using an automatic comparator (which is not foreseen with weight support plates).
The method can be used for E₁ weights, when the highest accuracy is required.
Uncertainty obtained in this case for the unknowns weights is better than that obtained usually for E₁, being at the level acquired for reference standards.

Water is an essential good for human being necessity. It must be protected against pollution and useless leakage. Urban waterworks is a strategic infrastructure to be managed with particular attention and care so that users must be satisfied. Different techniques are used to detect leaks from waterworks, specifically from pipelines carrying water. Among them, spectral analysis is very interesting to apply amid problems related to the pipeline section. This paper presents an application of STFT (short-term Fourier transform) technique for identifying urban waterworks leaks; STFT technique is usually used in processing speech. For the purposes of this research, a specific pipeline plant has been build in other to feature a real case. The pipeline section is almost one inch; the adopted section makes the research very interesting since spectral analysis, based essentially on FFT, is generally used for section greater than 20 cm.

X-ray Computed Tomography (CT) is the latest innovation in manufacturing metrology as it offers several opportunities which are not possible with conventional tactile or optical measurement devices: The volumetric which is gained from a CT measurement represents – in contrast to other principles in manufacturing metrology – not only the surface but even the entire volume of the object which allows the analysis of conventionally not accessible features. Due to this fact current research work is concerned with the determination of the task-specific measurement uncertainty for CT measurements as it is an important parameter describing the quality and the reliability of measurement results. This paper presents research work focused on the determination of influences which can be controlled by the machine operator in the preparation of the measurement data acquisition and evaluation, like the magnification of the workpiece, the number of projections taken, or the position and orientation of the workpiece. After the quantification of these influences a task-specific measurement uncertainty budget according to GUM has been calculated. These results can either be used to compare the user-controllable influence to the influence of the machine components on measurement uncertainty or as guidance for the operator to reduce uncertainty in preparation of measurements.

The paper covers state of the art and latest development of piezoelectric motors at Kaunas University of Technology (Lithuania), that are related to the R&D of laser scanning and deflecting devices, measuring systems, nano-resolution positioning devices on the plane, various applications including teaching aids for Mechatronics studies and even "intelligent" toys. All presented motors are one- or multi-degree-of-freedom (multi DOF) resonant devices and generate continuous or step motion of the positioning object.