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Domenico Grimaldi, Francesco Lamonaca
MEASUREMENT TECHNIQUES TO ASSESS THE TIME SYNCHRONIZATION IN DISTRIBUTED SYSTEMS

In the contest of the standard IEEE 1588, protocol for the synchronization of the node clock in Distributed System (DS), is of fundamental importance to assess the effectiveness of the synchronization. On the basis of this consideration, the aspect taken into account in the paper concerns the different measurement techniques pointed out in literature to evaluate the time delay occurring in (i) the DS among the synchronized node clocks, (ii) the telecommunication network respect to the reference clock, and (iii) the hardware and software path involved by the arrival of the command at the synchronized node and the execution of the relative action. The intent is to furnish a critical analysis of the measurement techniques, and to highlight the advantages and the limitation in the practical evaluation of the time delay.

Domenico Grimaldi, Francesco Lamonaca, Carmelo Macrì
CORRECTION OF THE MOTION BLUR ALTERATION IN THE HUMAN LYMPHOCYTE MICRO-NUCLEUS IMAGE BASED ON WIENER’S DECONVOLUTION

The image correction based on the Wiener’s deconvolution is proposed by evaluating the Point-Spread Function (PSF) for motion blur alteration. This correction is experimented to reduce the number of rejected images by the pre-processing procedure pointed out to correct detection of the Micro Nucleuses into human lymphocyte images acquired from the Image Flow Cytometer. The proposed correction operates in conjunction with (i) the spatial filters, pointed out to correct the bad exposure, the Gaussian out of focus and the Gaussian noise, and (ii) the Wiener’s deconvolution with PSF particularized for Gaussian out of focus alteration with high intensity. The heavy computation burden of correction based on each one Wiener’s deconvolution compared with that based on spatial filters suggests to use each one of the Wiener’s deconvolution to process the rejected images from the spatial filters, only, and not all acquired images. According to this consideration and to speed up the complete pre-processing correction procedure, the implementation is based on the computing distributed service implemented by using the LabVIEW Shared Variables. The criteria to establish the number of PCs to be used is experimental evaluated.

Romani A., Romani M., Neri P., Olivieri G., Tacconi D., Vignolini P.
FEASIBILITY AND LIFE CYCLE ASSESSMENT OF SOYBEAN OIL AND SOY-ISOFLAVON PRODUCTION

The present work focuses mainly on evaluating the feasibility and economic sustainability of an integrated continuous soybean processing complex, having a capacity of 3,000 tons/24 hours, for the production of high quality oil for food, bio-lubricants, biodiesel and energy. The aim of this work is to estimate all input/output data based on the energy and material balanced calculation at each stage of soybean oil production in order to conduct a Life Cycle Assessment (LCA). Attention is also focused on the possibility of using soybean waste matter as a source of bioproducts possessing considerable added value: our aim is to develop new bioactive products to be used in phototherapy, cosmetic and agro-food industries (isoflavon production).

Ieri Francesca, Pinelli Patrizia, Pucci Simone, Curradi Giampiero, Romani Annalisa
OPTICAL MEASUREMENT SYSTEM IN FOOD QUALITY. USE OF FOODLAB METHOD FOR ANALYSIS OF EXTRA VIRGIN OLIVE OIL AND OLIVE FRUIT EXTRACTS

In food quality optical measurement methods are time- and solventconsuming and require specialized personnel and expensive instruments. CDR has created an innovative system (the FoodLab method) which permits determination of the total polyphenol value of an oil in a few minutes, using a micro quantity of sample. This innovative system was employed to evaluate polyphenols in extra virgin olive oil obtained from different geographical areas and olive cultivars and having a wide range of these compounds and in olive extracts, for a rapid and simple assessment of fruit ripening degree.

Domenico Luca Carnì, Domenico Grimaldi
SPECTRAL TEST OF DAC USING OVER SAMPLING AND LOW RESOLUTION ADC

In the paper a new testing method for spectral analysis of DACs is presented. The method requires low resolution high speed ADC to acquire the resulting signal obtained by adding to the output voltage of the DAC under test the periodic voltage with sawtooth shape. The zero crossing time sequence detected in the quantized signal is used to infer the value of the sawtooth voltage and, consequently, that of the output voltage of the DAC. Because the sampled signal is characterised by non-uniform sampling time, the spectral analysis is performed on the basis of a procedure pointed out to overcome the problem concerning the frequency ambiguities in the spectral analysis of non-uniform sampled signal. This procedure permits the reconstruction of the uniformly sampled spectrum by starting from the non-uniformly sampled one. The results of numerical test on 14-bit DAC by using 6 bit ADC were shown. Finally, the advantages of the method respect to another presented in literature, based on low resolution ADC and dithering, are discussed.

Borowik Bohdan
NEW APPROACH TO MEASURING VIBRATION PARAMETERS OF THE REMOTE OBJECTS WITH THE ZIGBEE TECHNIQUE

The paper presents the monitoring and measurement process for the remote object vibration in the plain space. Wireless, RF communication in Tx/Rx duplex mode provides transfer of data with ZigBee transceivers. Presented ZigBee technology operates in many various modes on frequency 2,4 GHz allowing the coordinator node to select certain path and data. Zig Bee technology can be alternative for other vibration research techniques. The vibration displacement is processed further by DSP Digital Signal Processing made with the microcontroller.

A. Moschitta, P. Carbone
TESTING DATA CONVERTERS WHEN SAMPLING IS INCOHERENT

Coherent sampling is a well known scheme for guaranteeing uniform distribution of sinewave phases. While such condition can be profitably exploited for testing Analog to Digital Converters (ADC) or Digital to Analog Converters (DAC), inaccuracies and non-idealities in both the signal generator and the sampling hardware make such condition rarely achievable. In this paper, the effect of deviations from the coherent sampling condition is analyzed, along with some effects on the related testing procedures.

OLEJNIK R. M.
MEASUREMENT UNITS IN BIBLICAL VERSES

Considered here are the units of length, mass and volume used in the Bible. The first part deals with the historical positioning of the occurrence of these measurement. The following will present the verses containing the names of these units.

Jankowski Piotr, Dudojć Boleslaw, Mindykowski Janusz
AN OPTIMETER DESIGNED TO REGISTER ULTRA FAST DISPLACEMENTS

In the paper authors present research results of a new simple optimeter used for register of ultra fast displacements of inductive-dynamic drive disk. Presented solution is characterised by very simple construction, high output signal and a relatively good linearity.

S. Ciurlo, A. Mariscotti, A. Viacava
A HELMHOLTZ COIL FOR HIGH FREQUENCY HIGH FIELD INTENSITY APPLICATIONS

In this work a general introduction to Helmholtz coil is presented and then attention is on a practical implementation of a wideband (50 kHz) coil for high magnetic flux density applications (several mT may be obtained). A specific winding design is presented that ensures wideband operation with a resonance frequency of 55 kHz in the present implementation. Performances of the square coils for different coil separation as reported in standards and literature are presented. Field uniformity is within ±1.5% and ±0.35% inside cubic volumes of 25% and 10% of the coil side respectively, so suitable also for high accuracy applications such as sensor calibration. Wire gauge and silicon insulation ensures the possibility of applying a significant input current in order to obtain several mT over an extended frequency range.

Page 799 of 977 Results 7981 - 7990 of 9762