Francesco Adamo, Gregorio Andria, Filippo Attivissimo, Nicola Giaquinto
The paper deals with the problem of measuring the soil moisture by an accurate and real-time method. Since no available measuring techniques provide both an accurate estimation of the soil water content and a user-friendly real-time system, the authors examine a method to assess the degree of the saturation with water in granular materials that use acoustic wave. Particularly, the influence of soil characteristics on velocity of wave propagation are analysed in systematic way. The final aim of the research is to carry out a simple and complete system for microclimate soil analysis.
Dina Šimuniæ, Zvonko Glavaš
The paper discusses measurements of Specific Absorption Rate at mobile telephone frequencies.More specifically, measurements are performed at frequency of GSM system, i.e. 900 MHz. Recently issued CENELEC standard in this field, as well as requirements of European Commission for SAR labeling of every phone are calling for creating and testing different measurement set-ups for this purpose. For this kind of testing, a mixture with required complex dielectric properties is necessary. One of the contributions presented in this paper is creating an adequate liquid with measuring its properties....
Armin Pavić
The accurate measurements are essential for an effective control of human exposure to electromagnetic fields. In the paper, some systematic errors that could be introduced in the measurement of ELF electromagnetic fields are identified. The influence of measurement errors on the measurement accuracy is quantified, and the procedures for minimizing and avoiding the errors are stated.
Valeriu David, Alexandru Salceanu, Mihai Cretu
This paper presents the instrumentation and the results of measurements of the magnetic and electric fields near an overhead high-voltage transmission line that passes through a residential area. For measurements have been used two sensors created and calibrated by the authors: a sensor for magnetic field measurement and a sensor for both magnetic and electric field measurements. The measurements have been made in several days with view to estimate the influence of the overhead high-voltage transmission line on the electromagnetic environment in a residential area (block of flats).
A. Cataldo, F. De Tomasi, A. Lay-Ekuakille, M. R. Perrone, A. Trotta
A Raman lidar (Light Detection And Ranging) can be implemented in the straightforward fashion illustrated in Fig. 1. The system operates by transmitting a laser pulse of arbitrary wavelength λ0 and recording radiation backscattered from the atmosphere as function of time to provide range information in a similar manner to a radar system. The return signal contains a strong elastically scattered component (at λ0) that is useful for profiling clouds and aerosols and also weaker inelastically scattered components that provide chemical-specific information. For profiling water vapor, we use...
Nadža Milanović, Mladen Boršić
To simplify the usage of a computer network as a virtual parallel machine, as well as to introduce the opportunity of distributed parallel computing to Visual Basic users, a DCOM-based software infrastructure has been implemented. This infrastructure is based on a masterslave model. Algorithm for workload allocation in distributed computing system used with this software infrastructure is proposed in this article. Algorithm is used in finding the simple solution of traveling salesman problem and with more complex schedule feasibility analysis.
Anagnostopoulos Ioannis, Anagnostopoulos Christos, Psoroulas Ioannis, Kouzas Georgios, Kotsakis Stavros, Loumos Vassileio, Kayafas Eleftherios
During the last years, several types of network restoration techniques have been proposed and discussed. However it was evaluated that a single restoration technique cannot cover the wide range of customer’s requirements on survivability and economical spare channel assignment. This is due to the fact that each technique has its own feature and properties in terms of restoration time, flexibility, applied network elements and restoration cost. A proposed Alternative Shared Self-healing Ring Algorithm (ASSRA) is placed as substitution in a phase of an algorithm, which use an integrated...
Roman Wyżgolik
The numerical methods based on a wavelet analysis and their application in seismic signals for the purpose of denoising and automatically identifying of the P phase arrival are presented. The methods implemented in the computer program and the results are presented. The methods are used for the low-amplitudes, therefore noisy signals, which were usually rejected because of the problem with the proper P phase arrival identification.
Jerzy Nabielec
The paper presents a measuring system, which performs auto-correction of dynamic errors caused by its analogue input circuits. Input signal is used for selfidentification of the system parameters. Influence of sampling frequency and A/D converter resolution on the correction efficiency has been investigated. A range of the system analogue part parameters variation, which allows for the efficient correction, has been determined. A measure, which determines the effectiveness of correction as related to the measurement result without the correction has been introduced. Investigation has been...
Manuel Fonseca da Silva, Pedro Miguel Ramos, António Cruz Serra
This paper describes an impedance measurement technique based on the use of a personal computer, two digitizing channels and the application of a four parameter sine fitting algorithm, that estimate amplitude, phase, offset and frequency of the voltages across the impedance under measurement and of a reference impedance. This simple and inexpensive setup leads to experimental results with accuracy comparable to those obtained with sophisticated high cost dedicated impedance measurement equipment. The results here presented, obtained by using a low cost 12 bit PC data acquisition board, for...