scholarly journals High-performance near-field thermophotovoltaic device with CaF2/W multilayer hyperbolic metamaterial emitter

2020 ◽  
Vol 69 (20) ◽  
pp. 204203
Author(s):  
Wei Du ◽  
Ge Yin ◽  
Yun-Gui Ma
Keyword(s):  
High Performance ◽  
Near Field ◽  
Hyperbolic Metamaterial

scholarly journals Passive control of structures for seismic loads

2000 ◽  
Vol 33 (3) ◽  
pp. 209-221 ◽  
Author(s):  
Ian G. Buckle
Keyword(s):  
High Performance ◽  
Passive Control ◽  
Base Isolation ◽  
Mechanical Energy ◽  
Near Field ◽  
The United States ◽  
Industrial Plant ◽  
Passive Systems ◽  
Limit States ◽  
Existing Structures

The control of structures to improve their performance during earthquakes was first proposed more than a century ago. But it has only been in the last 25 years that structures have been successfully designed and built using earthquake protective systems. Today these systems range from simple passive devices to fully active systems. This paper focuses on passive control and reviews recent developments in the state-of-the-art. Passive systems include tuned mass dampers, seismic (base) isolation systems, mechanical energy dissipators, and the like. Major developments in the theory, hardware, design, specification, and installation of these systems have permitted significant applications to buildings, bridges, and industrial plant. Applications are now found in almost all of the seismically active countries of the world, but principally in Italy, Japan, New Zealand and the United States. Noteworthy advantages have been demonstrated when retrofitting existing structures, and designing high-performance structures such as hospitals, emergency response facilities, defense installations, and critical bridges. Field experience in recent earthquakes has confirmed these expectations. There are however limitations to the use of passive systems and these deserve further study and research. They include the uncertainty of response in the near field of an active fault, the non- optimal behavior of passive systems for both small and large earthquakes, and a lack of certainty about the ultimate limit states in unexpectedly large events. As a consequence, in some jurisdictions, code provisions for passive systems are more onerous than for conventional construction, which is a strong disincentive to their use. The limited availability of design guidance in text books, code commentaries, and other design aids are further impediments to the wider use of these systems.

scholarly journals High-Performance and Small-Form Factor Near-Field Inductive Coupling for 3-D NoC

2018 ◽  
Vol 26 (12) ◽  
pp. 2921-2934 ◽  
Author(s):  
Srinivasan Gopal ◽  
Sourav Das ◽  
Pawan Agarwal ◽  
Sheikh Nijam Ali ◽  
Deukhyoun Heo ◽  
...  
Keyword(s):  
Form Factor ◽  
High Performance ◽  
Near Field ◽  
Inductive Coupling ◽  
Small Form ◽  
Small Form Factor

Thermal Degradation of Tungsten Nanowire-Based Hyperbolic Metamaterial Emitters for Near-Field Thermophotovoltaic Applications

2022 ◽  
Vol 43 (2) ◽  
Author(s):  
Yingshi Zhang ◽  
Kai Li ◽  
Xudong Yang ◽  
Shaowen Cao ◽  
Haoqiang Pang ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Near Field ◽  
Hyperbolic Metamaterial

Numerical validation of using multisource statistically optimized near-field acoustical holography in the vicinity of a high performance military aircraft

2017 ◽  
Vol 142 (4) ◽  
pp. 2514-2514 ◽  
Author(s):  
Kevin M. Leete ◽  
Alan T. Wall ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Micah Downing ◽  
...  
Keyword(s):  
High Performance ◽  
Near Field ◽  
Military Aircraft ◽  
Numerical Validation ◽  
Acoustical Holography

scholarly journals Near-perfect broadband absorption from hyperbolic metamaterial nanoparticles

2017 ◽  
Vol 114 (6) ◽  
pp. 1264-1268 ◽  
Author(s):  
Conor T. Riley ◽  
Joseph S. T. Smalley ◽  
Jeffrey R. J. Brodie ◽  
Yeshaiahu Fainman ◽  
Donald J. Sirbuly ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
High Performance ◽  
Low Cost ◽  
Perfect Absorption ◽  
Hyperbolic Metamaterial ◽  
Broadband Absorption ◽  
Essential Components ◽  
Aluminum Doped Zinc Oxide ◽  
Detection Energy ◽  
Planar Films

Broadband absorbers are essential components of many light detection, energy harvesting, and camouflage schemes. Current designs are either bulky or use planar films that cause problems in cracking and delamination during flexing or heating. In addition, transferring planar materials to flexible, thin, or low-cost substrates poses a significant challenge. On the other hand, particle-based materials are highly flexible and can be transferred and assembled onto a more desirable substrate but have not shown high performance as an absorber in a standalone system. Here, we introduce a class of particle absorbers called transferable hyperbolic metamaterial particles (THMMP) that display selective, omnidirectional, tunable, broadband absorption when closely packed. This is demonstrated with vertically aligned hyperbolic nanotube (HNT) arrays composed of alternating layers of aluminum-doped zinc oxide and zinc oxide. The broadband absorption measures >87% from 1,200 nm to over 2,200 nm with a maximum absorption of 98.1% at 1,550 nm and remains large for high angles. Furthermore, we show the advantages of particle-based absorbers by transferring the HNTs to a polymer substrate that shows excellent mechanical flexibility and visible transparency while maintaining near-perfect absorption in the telecommunications region. In addition, other material systems and geometries are proposed for a wider range of applications.

Near-field acoustical holography applied to high-performance jet aircraft noise

2010 ◽  
Author(s):  
Alan T. Wall ◽  
Kent L. Gee ◽  
Michael D. Gardner ◽  
Tracianne B. Neilsen ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Near Field ◽  
Aircraft Noise ◽  
Acoustical Holography
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