The paper presents an application of the linear algebra in the creation of a measuring scale for some class of multidimensional quantities. It shows how important the following two elements are: the domain of objects (signals), and the method of their comparison. In most cases when we change one of those elements or both, the sense of the measuring quantity which is to be defined also changes. The paper shows how to select a set of primary standards and how to generate a set of secondary standards. The standards are modelled by a set of vector bases, and the changed set of standards is modelled by a linear transformation by using a transient matrix. The measuring process is modelled by a linear combination, and the “zero method” by a certain linear dependence. Two scales are created in order to illustrate the above process. One for the “shape” of a steady solution, and the other for the “shape” of a transient solution, both in the RLC linear electrical circuit .

The measurement of perceived quantities is of great interest in nowadays world, where man often interfaces with machines through his senses. This works presents a thorough investigation of the jury-test methods for the construction of reference measurement scales and for the subsequent development of suitable measurement procedures. Cross-validation of complementray tests is addressed, for assuring the reliabilty of the results, as well as the importance of test protocols and of operators’ interface. As a support to the proposed methodology, two test cases, concerning automotive noises, are presented in details, showing encouraging results. This study is also intended as to provide support for a standardisation of this kind of methods.

Some notes for a conceptual history of measurement are presented, to introduce the basic positions that have been maintained about the issue that can be considered as the general epistemological problem of measurement: what characterizes measurement with respect to generic evaluation?
This characterization, in which three distinct positions are recognized correspondingly to what we call Metaphysical Period, Anti-Metaphysical Period, and Relativistic Period, allows us to introduce and shortly discuss some general issues on the current epistemological status of Measurement Science.
The goal of this work is more to identify and characterize some current epistemological problems of measurement than to give them a solution.

The damping behavior of metallic foams is excellent. This attribute can be useful in applications in lightweight structures to overcome noise and vibration problems. This paper presents an experimental investigation for determination of elastic and damping properties for ductile aluminum foam (AlMg1Si0.6) produced by the powder metallurgy method. The Resonant Frequency and Damping Analyzer (RFDA), which is a non-destructive testing device to determine the resonant frequency of materials, were used to perform the experiment. Tests were carried out on rectangular bar samples with skin, having density in range 0.5 to 0.6 g/cm³. If the sample shape, dimensions and mass are known the Young’s Modulus and Shear Modulus are calculated from the fundamental flexural resonant frequency (out of plane flexure) and torsional resonant frequency according to ASTM E 1876. Internal friction coefficient (Q^-1) can be also calculated according with f_r - Frequency (Hz) and k - Loss rate (1/s).

MEMS made of photosensitive polymers offer new functionalities and applications in the micro world. Additionally to the new materials and advanced technologies the analysis of the thermo-mechanical material properties is required to ensure reliability and lifetime. Under this point of view, an uniaxial micro tensile measuring system has been developed to determine stress-strain-curves, Young’s modulus or Poisson’s ratio. The results will be shortly compared with those of Dynamic-Mechanical Analysis (DMA).