Technical principles of operation stability for machine aggregate on the slope

2015 ◽  
Vol 3 (9) ◽  
pp. 164-168
Author(s):  
S. Smolinskiy
Keyword(s):  
Operation Stability ◽  
Technical Principles ◽  
Machine Aggregate

scholarly journals Wind Turbine Blade Monitoring with Brillouin-Based Fiber-Optic Sensors

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Agnese Coscetta ◽  
Aldo Minardo ◽  
Lucio Olivares ◽  
Maurizio Mirabile ◽  
Mario Longo ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Fiber Optic ◽  
Strain Sensor ◽  
Experimental Tests ◽  
Fiber Optic Sensors ◽  
Composite Blade ◽  
Operation Stability ◽  
Distributed Strain ◽  
Strain Detection

Wind turbine (WT) blade is one of the most important components in WTs, as it is the key component for receiving wind energy and has direct influence on WT operation stability. As the size of modern turbine blade increases, condition monitoring and maintenance of blades become more important. Strain detection is one of the most effective methods to monitor blade conditions. In this paper, a distributed fiber-optic strain sensor is used for blade monitoring. Preliminary experimental tests have been carried out over a 14 m long WT composite blade, demonstrating the possibility of performing distributed strain and vibration measurements.

Anatomic bases of a new technique of juxta-acetabular osteotomy technical principles and performance

1998 ◽  
Vol 20 (3) ◽  
pp. 153-159
Author(s):  
J. Y. Lazennec ◽  
N. Mora Valladares ◽  
C. G. Laudet ◽  
D. Barabas ◽  
S. Ramare ◽  
...  
Keyword(s):  
New Technique ◽  
A New Technique ◽  
And Performance ◽  
Technical Principles

Noninvasive Monitoring of Oxygenation in Infants and Children: Practical Considerations and Areas of Concern

PEDIATRICS ◽  
1994 ◽  
Vol 93 (5) ◽  
pp. 737-746
Author(s):  
Christian F. Poets ◽  
David P. Southall
Keyword(s):  
Infants And Children ◽  
Preterm Neonates ◽  
Skin Thickness ◽  
Term Infants ◽  
Movement Artifact ◽  
Sensor Temperature ◽  
Technical Principles ◽  
Pulse Oximeters ◽  
In Infants And Children

Objective. To review the technical principles of transcutaneous Po2 (tcPo2) monitors and pulse oximeters and to discuss methodological and practical issues related to the use of these devices in infants and children. Design. Literature review and summary of personal experience. Results. tcPo2 measurements are influenced by skin thickness, sensor temperature, amount of contact gel used, and state of peripheral perfusion. The average in vivo response time to a rapid decrease in Pao2 is approximately 16 seconds. Sensitivity to both hypoxemia (Pao2 < 50 mm Hg) and hyperoxemia (Pao2 > 80 to 100 mm Hg) is approximately 85%. Pulse oximeters require careful sensor placement (to avoid optical shunts) and adequate pulse pressures (> 20 mm Hg). They are prone to movement artifact. There are considerable differences in bias and precision between different brands, resulting, for example, in quite different upper alarm limits required to detect hyperoxemia reliably. The normal range of oxygen saturation measured by pulse oximetry, measured with one brand of pulse oximeter (Nellcor) during regular breathing, is 95% to 100% in preterm infants and 97% to 100% in full-term infants and children. Conclusions. Because both devices have their specific shortfalls, they should ideally be used in combination, particularly in critically ill preterm neonates. Where this is not feasible or necessary, clinicians must be aware of the limitations of the device they are using.

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