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Page 770 of 936 Results 7691 - 7700 of 9356

Marko Jurčević, Hrvoje Hegeduš, Roman Malarić, Hrvoje Zeba
GENERIC ENVIRONMENT FOR INTERNET-ENABLED CALIBRATION SERVICES

Since many of the available digital instruments are provided with some communication interfaces and the internet-enabled metrology is rapidly developing in the recent years, it is possible to create an actual remote calibration system with remote control capabilities. This approach addresses a wide range of possible applications that allows driving many kinds of different devices and can be easily upgraded. This paper focuses on some of the solutions for security problems regarding remotely executed internet-enabled calibration processes.

Valeriu David, Ionut Nica, Romeo Ciobanu, Alexandru Salceanu
THE NUMERICAL SIMULATIONS OF THE ELECTROMAGNETIC SHIELD BASED ON CHIRAL HONEYCOMB SLAB

In this paper, by means of electromagnetic numerical simulations using CST software, we determined the electromagnetic shielding proprieties of the chiralhoneycomb slab. We represented and we made an optimization of the electromagnetic transmission coefficients, depending on the unit cell’s geometrical parameters of chiral-honeycomb slab. Finally we proposed some shield panels based on dielectric hexachiral-honeycomb slab coated with thin metallic layer, with a view to be used in the electromagnetic protection at the buildings level.

Valeriu David, Ionut Nica, Alexandru Salceanu, Octavian Baltag
THE MEASUREMENT OF RADIOFREQUENCY ELECTROMAGNETIC FIELDS IN SOME SPECIAL PLACES

In this paper we present the levels of electromagnetic fields, due to the radiofrequency communication systems, in some special places as: hospitals, laboratories in the city and houses situated near broadcastings towers. Comparative measurements were made, using some types of near field probes and antennas in 90 MHz ÷ 2700 MHz frequency domain. We also determined both the root mean square – r.m.s. values of the three perpendicular components of the electric fields and the r.m.s. values of the maximum electric field vector, and then we compared the results. The aim of our measurements is the evaluation of the electromagnetic fields levels generated by communication systems, because of their possible interaction on the human body, electronic medical equipment and generally electrical devices.

Mariusz Szweda, Tomasz Tarasiuk
FREQUENCY CHARACTERISTIC OF TRANSIENTS AND NOTCHING DISTURBANCES – CASE STUDY

This paper is focused on the problem of transient and notching recognition. Especially, a problem of frequency characteristic of real impulses are considered. Aim of the paper is to determine a minimum covered frequency bandwidth, when dealing with this kind of disturbances. Parameters of the selected transient and notching disturbances are determined, after extracting disturbances by pass-band filters with various corner (cut-off) frequencies. Finally, some remarks regarding these disturbances measurements are presented.

L. Carretta, G. Giorgi, R. Napolitano, C. Narduzzi, M. Stellini
CHARACTERIZATION OF HV LINES FOR DIGITAL POWER LINE CARRIER OPERATION

Introduction or upgrades of digital Power Line Carrier (PLC) communications equipment often require a new assessment of relevant power line features. This paper outlines an effective approach for measurement of the most important parameters in a PLC channel, which exploits advances in digital oscilloscope technology and software post-processing of acquired test data. Experimental results obtained on a 132 kV distribution line are presented to support the theoretical discussion.

Emil Vremera, Luciano Brunetti, Luca Oberto, Marco Sellone
MEASUREMENT ALGORITHMS IN MICROCALORIMETER TECHNIQUES AT MICROWAVE FREQUENCIES

In the paper there are described different algorithms that are possible to be used in the microcalorimeter-based measurements for realizing the broadband high frequency power standards. Besides the equal time-intervals alternating algorithms, able to achieve the effective efficiency of the transfer power standards, it is presented a novel algorithm, based on keeping constant the limits of the microcalorimeter output quantity. The new method should be used for measuring the high frequency losses in magnetic amorphous wires.

Daniel Belega, Dominique Dallet, David Slepička
SOME ASPECTS CONCERNING THE AMPLITUDE ESTIMATION OF A SINE WAVE BY ENERGY-BASED METHOD

In this paper the influence of quantization noise on the amplitude estimation of a sine wave by energy-based method is investigated. A condition for the number of acquired samples is derived to ensure that the absolute amplitude error due to the quantization noise is smaller than a desired value with a high confidence level. Based on this condition some important conclusions are drawn. Carried out simulation confirms the validity of the derived condition.

Giuseppe La Paglia, Gian Carlo Bosco, Marco Lanzillotti,  Luca Callegaro
THE EFFECT OF ADJUSTMENT ON MULTIFUNCTION INSTRUMENTS FOR ELECTRICAL METROLOGY: CASE EXAMPLES

Top-class multifunction instruments (multimeters and calibrators) implement in their firmware adjustment procedures requiring a minimal set of adjustment standards. The small set of standards' values provided have effects on the (usually very broad) ranges of values and frequencies which the instrument can measure. How errors and uncertainties in the adjustment of specific points affect measurements in such broad ranges has been experimentally investigated in top-class multimeters and calibrators; most interesting results have been observed in the ‘ac voltage’ function; a number of examples are reported.

Richard Fertell
LIQUID FLOW RATE AUTOMATION & UNCERTAINTY – STAYING DRY

Real-life example of laboratory automation of data collection, device calibration, measurement uncertainty calculations & certificates for Liquid Mass Flow and Volumetric Flow Rate. Wet suits are not required to evaluate and compare coriolis mass flow meters and turbine volumetric flow meters in re-circulating systems and weigh standards. The effects of time, temperature, density, viscosity, air-buoyancy, flow stability, EMI and others can be startling; who knew? An off-the-shelf liquid recirculating system with data collection is evaluated with transfer standards for liquid flow rate and temperature. The flow system with turbine volumetric flow meters is compared with coriolis mass flow meter transfer standards. Various measurement agreements and errors are revealed for flow rate, temperature & density. Automation saves time, decreases measurement uncertainty and makes some flow rate analysis practical.

Koichi Funada, Mituo Nagao, Susumu Sakano
GRASP OF HARD AND SOFT OBJECTS BY DETECTIING FINGERTIP SLIP USING MULTI FINGERS HAND

The paper presents hardware and software architecture of the developed multi-finger hand robot using tactile sensors. The hand has three identical fingers. The fingers can detect hard and soft physical information by the tactile sensors using phase shift method. The soft and hard objects can be grasped and held easily by detecting slipping properties between the fingers and object. The development of dexterous robot hand is a very challenging endeavor. Many robot researchers has pursued the dexterous robot hands. Many robot hands have been developed over the past. These robot hands make it possible for the robot to grasp and manipulate objects. The tactile sensors are used for the detection of contact pressure to hold object. It is not possible to control soft object easily because of the very small contact pressure. In this study, the new tactile sensor of piezoelectric device is developed and the detection of the small contact pressure can be achieved by the phase shift method. The soft object is grasped and held easily by the detection of the slipping property between the tactile sensors and the object.

Page 770 of 936 Results 7691 - 7700 of 9356