Jackets Off: The Impact of Laser Fiber Stripping on Power Output and Stone Degradation

The dependence of temporal correlations in the power output of wind-turbine pairs on atmospheric stability is explored using theoretical arguments and wind-farm large-eddy simulations. For this purpose, a range of five distinct stability regimes, ranging from weakly stable to moderately convective, were investigated with the same aligned wind-farm layout used among simulations. The coherence spectrum between turbine pairs in each simulation was compared to theoretical predictions. We found with high statistical significance (p < 0.01) that higher levels of atmospheric instability lead to higher coherence between turbines, with wake motions reducing correlations up to 40%. This is attributed to higher dominance of atmospheric motions over wakes in strongly unstable flows. Good agreement resulted with the use of an empirical model for wake-added turbulence to predict the variation of turbine power coherence with ambient turbulence intensity (R 2 = 0.82), though other empirical relations may be applicable. It was shown that improperly accounting for turbine–turbine correlations can substantially impact power variance estimates on the order of a factor of 4.

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The impact of the laser fiber-tissue distance on histological parameters in a porcine kidney model

World Journal of Urology ◽

10.1007/s00345-020-03326-5 ◽

2020 ◽

Cited By ~ 1

Author(s):

Mark Taratkin ◽

Christopher Netsch ◽

Dmitry Enikeev ◽

Andreas J. Gross ◽

Thomas R. W. Herrmann ◽

...

Keyword(s):

Porcine Kidney ◽

Laser Fiber ◽

The Impact

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Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms

Energies ◽

10.3390/en13071810 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1810 ◽

Cited By ~ 1

Author(s):

Shyuan Cheng ◽

Yaqing Jin ◽

Leonardo P. Chamorro

Keyword(s):

Wind Turbines ◽

Power Output ◽

Large Scale ◽

Outer Region ◽

Wind Farms ◽

Mixing Enhancement ◽

Incoming Flow ◽

Economic Optimization ◽

Blade Length ◽

The Impact

We experimentally explored the impact of a wind turbine with truncated blades on the power output and wake recovery, and its effects within 2 × 3 arrays of standard units. The blades of the truncated turbine covered a fraction of the outer region of the rotor span and replaced with a zero-lift structure around the hub, where aerodynamic torque is comparatively low. This way, the incoming flow around the hub may be used as a mixing enhancement mechanism and, consequently, to reduce the flow deficit in the wake. Particle image velocimetry was used to characterize the incoming flow and wake of various truncated turbines with a variety of blade length ratios L / R = 0.6 , 0.7, and 1, where L is the length of the working section of the blade of radius R. Power output was obtained at high frequency in each of the truncated turbines, and also at downwind units within 2 × 3 arrays with streamwise spacing of Δ x / d T = 4 , 5, and 6, with d T being the turbine diameter. Results show that the enhanced flow around the axis of the rotor induced large-scale instability and mixing that led to substantial power enhancement of wind turbines placed 4 d T downwind of the L / R = 0.6 truncated units; this additional power is still relevant at 6 d T . Overall, the competing factors defined by the expected power reduction of truncated turbines due to the decrease in the effective blade length, the need for reduced components of the truncated units, and enhanced power output of downwind standard turbines suggest a techno-economic optimization study for potential implementation.

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Nano-Mixture Coating and Geometrical Configuration Impact on Cantilever Based Piezoelectric Energy Harvesting System

Energy Harvesting and Systems ◽

10.1515/ehs-2018-0005 ◽

2018 ◽

Vol 5 (3-4) ◽

pp. 53-65 ◽

Cited By ~ 1

Author(s):

Dinesh R. Palikhel ◽

Tyrus A. McCarty ◽

Jagdish P. Sharma

Keyword(s):

Energy Harvesting ◽

Transport System ◽

Power Output ◽

Limiting Factor ◽

Piezoelectric Energy Harvesting ◽

Intermodal Transport ◽

Power Harvesting ◽

Piezoelectric Energy ◽

Energy Harvesting System ◽

The Impact

Abstract Vibrational energy from intermodal transport system can be recovered through the application of piezoelectric energy harvesting system. The intermodal vibration sources are passenger cars and freight trucks moving on streets and highways, trains moving on railway tracks and planes moving on airport runways. However, the primary limiting factor of the application of the piezoelectric energy harvesting system has been the insignificant power output for power storage or to directly power electrical device. A special nano-mixture coating is developed to enhance the energy harvesting capability of the conventional piezoelectric material. This research investigates the impact of the nano-mixture coating on the power output. The experimental results of the nano-mixture coated system show substantial and explicit improvement on the power output. Alternative geometrical designs, trapezoidal and triangular are explored in anticipation for improved power output. But the rectangular energy harvester demonstrates better power harvesting capability. The results presented in this paper show the potential of the nano-mixture coating in power harvesting from intermodal transport system.

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MP50-05 IMPACT OF LASER FIBER TIP CLEAVAGE ON POWER OUTPUT FOR URETEROSCOPY AND STONE TREATMENT

The Journal of Urology ◽

10.1016/j.juro.2017.02.1593 ◽

2017 ◽

Vol 197 (4S) ◽

Author(s):

Mattieu Haddad ◽

Esteban Emiliani ◽

Steeve Doizi ◽

Yann Rouchausse ◽

Frederic Coste ◽

...

Keyword(s):

Power Output ◽

Laser Fiber ◽

Stone Treatment

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Improvements in the Power Output of a Horizontal Axis Wind Turbine Due to the Introduction of a Curved Blade

Volume 2: Symposia and General Papers, Parts A and B ◽

10.1115/fedsm2002-31255 ◽

2002 ◽

Author(s):

Erin K. Clarke ◽

Sylvester Abanteriba

Keyword(s):

Wind Tunnel ◽

Flow Visualization ◽

Wind Turbine ◽

Power Output ◽

Turbine Blades ◽

Horizontal Axis Wind Turbine ◽

Modified Model ◽

Curved Blade ◽

Generation Capacity ◽

The Impact

This paper examines the impact on the power generation capacity of a wind turbine as a result of the modification of the shape of the blades of an existing wind turbine. The modification involves curving the blades in the direction of rotation resulting in an increase in generated lift and therefore an increase in the power output of the wind turbine. Two three-bladed models were tested in a wind tunnel, one original straight-bladed model and one modified model both of which were 0.84 m in diameter. A study of the methods of flow visualization for a wind turbine in a wind tunnel was investigated. The corresponding results are presented. It was discovered that the china clay method of flow visualization in conjunction with a strobe light gave a good indication of the direction of the airflow over the turbine blades as did condensed oil droplets from a smoke wand which presented a very clear indication of the span-wise flow. It was concluded from the investigation that curving the blade into the direction of rotation on a wind turbine produced a greater power output at the same wind speed as an unmodified wind turbine.

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Evaluating the Impact of the Uncertainty of Evaporative Cooler Effectiveness on the Net Power for a PTC 46 Test

ASME 2010 Power Conference ◽

10.1115/power2010-27095 ◽

2010 ◽

Author(s):

Matthew J. Dooley

Keyword(s):

Relative Humidity ◽

Power Output ◽

Combined Cycle ◽

Performance Guarantees ◽

K Factor ◽

Evaporative Cooler ◽

The Impact

This paper discusses how relative humidity impacts the effectiveness of an evaporative cooler, the uncertainty of the calculated effectiveness and the corresponding impact of the limits of this uncertainty on the power output. This is particularly related to a combined cycle facility where performance guarantees are based upon the evaporative cooler being in service. Different options for testing with and without the evaporative cooler in service are discussed as well as the need for an uncertainty when using a K factor.

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Reducing Anxiety and Anxiety Sensitivity With High-Intensity Interval Training in Adults With Asthma

Journal of Physical Activity and Health ◽

10.1123/jpah.2019-0521 ◽

2020 ◽

Vol 17 (8) ◽

pp. 835-839

Author(s):

Carley O’Neill ◽

Shilpa Dogra

Keyword(s):

Anxiety Sensitivity ◽

Power Output ◽

High Intensity ◽

Peak Power ◽

Interval Training ◽

Peak Power Output ◽

Sensitivity Index ◽

High Intensity Interval Training ◽

High Intensity Interval ◽

The Impact

Background: Low- and moderate-intensity exercise training has been shown to be effective for reducing general anxiety and anxiety sensitivity among adults with asthma. Exercise frequency and intensity have been shown to play an integral role in reducing anxiety sensitivity; however, less is known about the impact of high-intensity interval training (HIIT) on anxiety in adults with asthma. Methods: A 6-week HIIT intervention was conducted with adults with asthma. Participants completed HIIT (10% peak power output for 1 min, 90% peak power output for 1 min, repeated 10 times) 3 times per week on a cycle ergometer. Preintervention and postintervention assessments included the Anxiety Sensitivity Index-3 and the Body Sensations Questionnaire. Results: Total Anxiety Sensitivity Index-3 (PRE: 17.9 [11.8]; POST 12.4 [13], P = .002, Cohen d = 0.4, n = 20) and Body Sensations Questionnaire (PRE: 2.4 [1.0]; POST: 2.0 [0.8], P = .007, Cohen d = 0.3) improved from preintervention to postintervention. Conclusion: A 6-week HIIT intervention leads to improved anxiety among adults with asthma. Future research should determine the impact of HIIT among adults with asthma with clinical anxiety.

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Determining the impact of VAWT farm configurations on power output

Renewable Energy ◽

10.1016/j.renene.2019.05.084 ◽

2019 ◽

Vol 143 ◽

pp. 1111-1120 ◽

Cited By ~ 5

Author(s):

Andrew Barnes ◽

Ben Hughes

Keyword(s):

Power Output ◽

The Impact

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