Evaluation of performance of near-field thermophotovoltaic systems based on entropy analysis

2020 ◽  
Vol 127 (6) ◽  
pp. 063103
Author(s):  
Bowen Li ◽  
Qiang Cheng ◽  
Jinlin Song ◽  
Kun Zhou ◽  
Lu Lu ◽  
...  
Keyword(s):  
Near Field ◽  
Entropy Analysis ◽  
Evaluation Of Performance ◽  
Thermophotovoltaic Systems

scholarly journals Overcoming the black body limit in plasmonic and graphene near-field thermophotovoltaic systems

2012 ◽  
Vol 20 (S3) ◽  
pp. A366 ◽  
Author(s):  
Ognjen Ilic ◽  
Marinko Jablan ◽  
John D. Joannopoulos ◽  
Ivan Celanovic ◽  
Marin Soljačić
Keyword(s):  
Near Field ◽  
Black Body ◽  
Thermophotovoltaic Systems

scholarly journals Mie-Metamaterials-Based Thermal Emitter for Near-Field Thermophotovoltaic Systems

Materials ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 885 ◽  
Author(s):  
Alok Ghanekar ◽  
Yanpei Tian ◽  
Sinong Zhang ◽  
Yali Cui ◽  
Yi Zheng
Keyword(s):  
Near Field ◽  
Thermal Emitter ◽  
Thermophotovoltaic Systems

scholarly journals Self-sustaining thermophotonic circuits

2019 ◽  
pp. 201904938
Author(s):  
Bo Zhao ◽  
Siddharth Buddhiraju ◽  
Parthiban Santhanam ◽  
Kaifeng Chen ◽  
Shanhui Fan
Keyword(s):  
Steady State ◽  
Power Density ◽  
Light Emitting Diodes ◽  
Near Field ◽  
State Power ◽  
Field Enhancement ◽  
Photon Flux ◽  
Light Emitting ◽  
General Importance ◽  
Thermophotovoltaic Systems

Photons represent one of the most important heat carriers. The ability to convert photon heat flow to electricity is therefore of substantial importance for renewable energy applications. However, photon-based systems that convert heat to electricity, including thermophotovoltaic systems where photons are generated from passive thermal emitters, have long been limited by low power density. This limitation persists even with near-field enhancement techniques. Thermophotonic systems, which utilize active photon emitters such as light-emitting diodes, have the potential to significantly further enhance the power density. However, this potential has not been realized in practice, due in part to the fundamental difficulty in thermodynamics of designing a self-sustaining circuit that enables steady-state power generation. Here, we overcome such difficulty by introducing a configuration where the light-emitting diodes are connected in series, and thus multiple photons can be generated from a single injected electron. As a result we propose a self-sustaining thermophotonic circuit where the steady-state power density can exceed thermophotovoltaic systems by many orders of magnitude. This work points to possibilities for constructing heat engines with light as the working medium. The flexibility of controlling the relations between electron and photon flux, as we show in our design, may also be of general importance for optoelectronics-based energy technology.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

How to Evaluate Remote Tower Metrics in Connection With Weather Observations

2018 ◽  
Vol 8 (2) ◽  
pp. 100-111 ◽  
Author(s):  
Maik Friedrich ◽  
Christoph Möhlenbrink
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Influential Factors ◽  
Air Traffic ◽  
Weather Event ◽  
Evaluation Of Performance ◽  
Weather Events ◽  
Weather Observations ◽  
Validation Experiment ◽  
Remote Controller

Abstract. Owing to the different approaches for remote tower operation, a standardized set of indicators is needed to evaluate the technical implementations at a task performance level. One of the most influential factors for air traffic control is weather. This article describes the influence of weather metrics on remote tower operations and how to validate them against each other. Weather metrics are essential to the evaluation of different remote controller working positions. Therefore, weather metrics were identified as part of a validation at the Erfurt-Weimar Airport. Air traffic control officers observed weather events at the tower control working position and the remote control working position. The eight participating air traffic control officers answered time-synchronized questionnaires at both workplaces. The questionnaires addressed operationally relevant weather events in the aerodrome. The validation experiment targeted the air traffic control officer’s ability to categorize and judge the same weather event at different workplaces. The results show the potential of standardized indicators for the evaluation of performance and the importance of weather metrics in relation to other evaluation metrics.

Review of Evaluation of Performance: A Judgmental Approach.

1989 ◽  
Vol 34 (4) ◽  
pp. 413-413
Author(s):  
No authorship indicated
Keyword(s):  
Evaluation Of Performance

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements
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