The paper presents several problems of compression and interpolation associated with measurements in mapping ECG. There are presented two alternate methods of compression and interpolation and their implementation in processing environments. A comparative study between the results yielded applying the two methods will be done.

A new velocimeter for measurements in microscopic regions is presented. A common charge coupled device (CCD) has been used as spatial filter for one-component velocity measurements. The characteristics of this sensor are investigated and first application results presented.

The determination of systolic and diastolic arterial blood pressures is very important for the diagnosis of cardiovascular diseases. Common principles for noninvasive measurements are the Riva-Rocci/Korotkow- and the oscillometric methods with inflatable cuffs around an arm, wrist or finger. In our approach we use the dependency between pulse wave velocity and arterial blood pressure to calculate systolic and diastolic pressures on a beat to beat basis. The advantage is a continuous blood pressure monitoring and the reduced stress for the patient due to the reduction of cuff inflations. Because of the required calibration for each patient, conventional measurements cannot be totally evaded but are minimized to only two readings. The method is under test in a children's hospital during excercise-ECG registrations. The data acquisition and experimental setups, the digital signal processing and blood pressure calculation are described and discussed.

The structure and mechanical properties of cast alloys are closely related to the metallurgical and technological parameters of the production process. Mathematical models enabling the prediction of the structure and mechanical properties of cast alloys employ computer-aided analysis of the cooling curves scanned. The paper summarizes the results of research work aimed at obtaining data files recording the temperature waveform during the solidification of the specimens cast. The temperatures were recorded by means of type K thermocouples, and a DaqBook 100 analog to digital converter with the DBK 19 thermocouple card and DaqView 7.0 software were used to digitize the signal. The cooling curves obtained from experimental melts were analyzed in the Mathcad 7 Professional program environment, in which the modelling of the appearance of the primary (pouring) structure was also performed. In conclusion the structures predicted by mathematical models are compared with specimen structures evaluated by methods of stereometric metallography.

Abstract : Cutting temperature plays a very important role in metal cutting. The extent of the tool wear, degree of plastic deformation of the cutting edge and composition changes in the work piece material are influenced by cutting temperature. Of the several methods available for measuring cutting temperature, the tool-work thermocouple technique is the most widely used. Apart from the problem of a reliable calibration, frequent short-circuiting by the chip complicates measurement of thermo e.m.f in this method. This problem becomes more acute when multi-coated inserts with sculptured rake face geometry are used. The above mentioned problems associated with the tool-work thermocouple prompted an attempt to develop a new technique to predict cutting temperature during turning. In this method two standard k-type thermocouples were planted at the interface between the tool insert and the tool holder symmetrically . The bottom of the insert and the two sides were insulated for thermal isolation of the insert from the tool holder. The temperatures at these nodal points as measured by the thermocouples were correlated to cutting temperature using finite volume technique. An estimate of the effective heat transfer coefficient of the environment prevailing during cutting operation which is essential for developing this model was determined experimentally by a systematic procedure described in this paper.