1,720,992 research outputs found
A reliability analysis of non parametric tests for combined cyclic and monotonous drift evaluation
No full textOrlando FL (U.S.A.)
Field verification of a new methodology for simultaneous temperature and strain measurement
No full textOrlando FL (U.S.A.
Applicazione di reti di misura per il rilievo dei parametri ambientali nelle sale operatorie – SOAR (Smart Operating Room)
No full text
Experimental analysis of the airway circuit effects on breathing pattern generated by neonatal pulmonary ventilators
No full textAn experiment was performed in vitro to determine the effect of an airway-to-patient circuit on the breathing pattern actually delivered to the patient by a neonatal pulmonary ventilator. To this end, an automatic measuring system was implemented to record: (a) the ventilation parameter analog output signals provided by the ventilator and (b) the pressure value directly measured at the patient delivery site. The experimental analysis was conducted by examining various circuit configurations (tubes that differ in dimensions and rigidity, with and without humidifier, etc.) and pressure waveform changes. Noticeable differences between the respiratory pattern set by physicians and that actually delivered to the patient were observed and the measured data provide indication for correct air circuit design. Finally, the results contributed to increase the attention of the medical therapist, who is the only one able to estimate the actual patient ventilatory needs and their ranges of variation, to a more accurate ventilator setting in order to assure the correct breathing pattern for neonate health
Simultaneous measurement of temperature and strain using a three wire connection
No full textCincinnati OH (U.S.A.
An experimental analysis of the metrological performances of an automatic thermocouple instrumentation system conducted by a simple calibration setup
No full textThe strain gage-thermocouple: a novel device for simultaneous strain and temperature measurement
No full textA novel methodology for simultaneous strain and temperature measurements by means of an ac
powered electrical resistance strain gauge connected to a strain conditioner using thermocouple
wires is proposed and validated. To this aim a specific device has been designed and implemented;
the characteristics of the electronic circuit for signal conditioning have then been tested in order to
determine the overall performances in temperature and strain measurements. The field verification
of the method is conducted by imposing strain fields in the range from 0 to about 700 mm/m and
temperature variations in the range from 210 to 100 °C. The difference between the strain measured
by the proposed device and the one evaluated by a conventional digital strain meter was always less
than 4 mm/m while the mean temperature discrepancy was 0.5 °C with respect to the reference
temperature measured with a K-type thermocouple. Finally, compensation of temperature effects on
the actual strain value has been performed while the temperature ranges from ambient to 100 °C
with a residual error value of 1.461 mm/m
The Leakage Current Sentinel: a novel plug-in socket device for on-line biomedical equipment electrical safety surveillance
No full textThe Leakage Current Sentinel ~LCS! has been designed and implemented for the detection of
hazardous situations caused by dangerous earth leakage current values in intensive care units and
operating theaters. The device, designed and manufactured with full compliance of the high risk
environment requirements, is able to monitor online the earth leakage current and detect ground
wire faults. Operation utilizes a microammeter with an overall sensitivity of 2.53104 V/A. In order
to assure the reliability of the device in providing alarm signals, the simultaneous presence of
absorbed power current is monitored by means of another ammeter with decreased sensitivity ~3.0
V/A!. The measured root mean square current values are compared with reference values in order
to send signals to NAND and OR complementary metal–oxide–semiconductor gates to enable
audible and visible alarms according to the possible hazardous cases examined in the article. The
final LCS packaging was shaped as a wall socket adapter for common electromedical device power
cord plugs, with particular attention to minimizing its dimensions and to provide analog voltage
outputs for both measured leakage and power currents, in order to allow automatic data acquisition
and computerized hazardous situation management. Finally, a personal computer based automatic
measuring system has been configured to simultaneously monitor several LCSs installed in the same
intensive care unit room and, as a consequence, to distinguish different hazardous scenarios and
provide an adequate alert to the clinical personnel whose final decision is still required. The test
results confirm the effectiveness and reliability of the LCS in giving an alert in case of leakage
current anomalous values, either in case of a ground fault or in case of a dangerous leakage curren
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