High efficiency, small-area bends in low index contrast waveguides

2003 ◽  
Author(s):  
L. Li ◽  
G. P. Nordin ◽  
J. Jiang ◽  
J. M. English
Keyword(s):  
Small Area ◽  
High Efficiency ◽  
Index Contrast

Multi-Frequency Heterodyne Phase Shift Technology in 3-D Measurement

2013 ◽  
Vol 774-776 ◽  
pp. 1582-1585 ◽  
Author(s):  
Le Wang ◽  
Lei Song ◽  
Li Jun Zhong ◽  
Peng Xin ◽  
Shuai Li ◽  
...  
Keyword(s):  
Phase Shift ◽  
Small Area ◽  
Fringe Pattern ◽  
Measurement Accuracy ◽  
High Efficiency ◽  
Median Filter ◽  
Distinct Advantage ◽  
Accuracy Measurement ◽  
Fringe Patterns ◽  
Spin Filtering

According to the characteristics of the fringe patterns noise, came up with a small area spin filtering noise cancellation algorithm based on parallel marker technology. It means that preprocess the fringe pattern before spin filtering, then did a median filter and calculated the stripe direction, finally used the extract the fringe direction to spin filtering of the original image. The algorithm can marked several targets in scanning process at the same time. So it has a high efficiency. The algorithm can be used in the multi-frequency heterodyne phase shift technology .And we can use the technology to complete the measurement of complex surfaces. Experimental results show that the method has a distinct advantage in measurement accuracy, measurement speed, and noise immunity.

scholarly journals Single Inductor-Multiple Output DPWM DC-DC Boost Converter with a High Efficiency and Small Area

Energies ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. 725 ◽  
Author(s):  
Young Park ◽  
Zaffar Khan ◽  
Seong Oh ◽  
Byeong Jang ◽  
Nabeel Ahmad ◽  
...  
Keyword(s):  
Small Area ◽  
High Efficiency ◽  
Boost Converter

High Efficiency Stable a-Si Three Junction 12″ × 13″ Modules

1991 ◽  
Vol 219 ◽  
Author(s):  
Murray S. Bennett ◽  
A. Catalano ◽  
J. Newton ◽  
C. Poplawski ◽  
R. Arya ◽  
...  
Keyword(s):  
Preliminary Data ◽  
Small Area ◽  
High Efficiency ◽  
Scale Up ◽  
Large Area ◽  
Good Resistance ◽  
Photovoltaic Modules ◽  
Area Efficiency ◽  
Efficiency Losses ◽  
Area Deposition

ABSTRACTThree junction a-Si based photovoltaic modules have been made using a design which provides high initial efficiency and good resistance to photodegradation. The cells have a Si/Si/SiGe configuration in which the i-layer in the middle junction is 4000Å thick. The most efficient module measured to date has an aperture area efficiency of 9.82%. This design will limit light-induced efficiency losses to 15% or less, based on small area results, however defect related problems have increased this value to 17 – 23%. Preliminary data on the effect of shunts on stability is presented. We discuss various concerns related to large area deposition and scale-up.

scholarly journals A Method and Device for Automated Grinding of Small Ceramic Elements

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7904
Author(s):  
Wojciech Kacalak ◽  
Dariusz Lipiński ◽  
Filip Szafraniec ◽  
Błażej Bałasz
Keyword(s):  
Small Area ◽  
High Efficiency ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Sequential Processing ◽  
Abrasive Grains ◽  
Automated Method ◽  
Developed Surface ◽  
Resin Binder ◽  
Diamond Abrasive

The paper describes an automated method for grinding small ceramic elements using a hyperboloid wheel. The problem of automating the process of machining elements made of nonmagnetic materials with a small area and low height has been solved. Automation of the grinding process was possible thanks to automatic clamping of workpieces in the machining zone and sequential processing by a specified number of grinding wheels. The workpieces were passed through successive machining zones. The division of the allowance of individual grinding wheels was made taking into account the characteristics of the workpieces and the requirements for the results of the machining. Obtaining a long grinding zone and the effect of automatic clamping of the workpieces was possible due to the inclination of the grinding wheel axis in relation to the plane of movement of the workpieces. Innovative aggregate grinding wheels were used for grinding. The aggregates containing diamond abrasive grains, connected with a metal bond, were embedded in the porous structure of the resin bond. The aggregates ensured high efficiency of grinding, and their developed surface contributed to good holding in the resin binder. The durability of grinding wheels was 64 h, which enables the machining of 76,000 ceramic elements.

Electroluminescence in the region of interband transitions in a high-efficiency silicon light-emitting diode with a small area of the rectifying contact

2006 ◽  
Vol 40 (7) ◽  
pp. 860-863 ◽  
Author(s):  
A. M. Emel’yanov ◽  
V. V. Zabrodskiĭ ◽  
N. V. Zabrodskaya ◽  
N. A. Sobolev ◽  
V. L. Sukhanov
Keyword(s):  
Small Area ◽  
High Efficiency ◽  
Light Emitting Diode ◽  
Interband Transitions ◽  
Light Emitting

scholarly journals High efficiency DBR assisted grating chirp generators for silicon nitride fiber-chip coupling

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Siddharth Nambiar ◽  
Praveen Ranganath ◽  
Rakshitha Kallega ◽  
Shankar Kumar Selvaraja
Keyword(s):  
Silicon Nitride ◽  
Film Thickness ◽  
Numerical Simulations ◽  
High Efficiency ◽  
Promising Material ◽  
Peak Efficiency ◽  
Grating Couplers ◽  
Band Region ◽  
Index Contrast ◽  
L Band

AbstractSilicon Nitride (SiN) is emerging as a promising material for a variety of integrated photonic applications. Given its low index contrast however, a key challenge remains to design efficient couplers for the numerous platforms in SiN photonics portfolio. Using a combination of bottom reflector and a chirp generating algorithm, we propose and demonstrate high efficiency, grating couplers on two distinct SiN platforms. For a partially etched grating on 500 nm thick SiN, a calculated peak efficiency of −0.5 dB/coupler is predicted, while for a fully etched grating on 400 nm thick SiN, an efficiency of −0.4 dB/coupler is predicted. Experimentally measured coupling efficiencies are observed to be −1.17 and −1.24 dB/coupler for the partial and fully etched grating couplers respectively in the C-L band region. Furthermore, through numerical simulations, it is shown that the chirping algorithm can be implemented in eight additional combinations comprising SiN film thickness between 300–700 nm as well as alternate claddings, to achieve a per coupler loss between −0.33 to −0.65 dB.

scholarly journals Strengthening the masonry bridges with use of corrugated steel plates

2016 ◽  
Vol 2016 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Czesław Machelski
Keyword(s):  
Small Area ◽  
High Efficiency ◽  
Steel Structures ◽  
Steel Plates ◽  
Long Time ◽  
Masonry Vaults ◽  
Construction Works

The following work presents the problem of old arched bridges, built a long time ago as masonry constructions and their revitalization. Nowadays this kind of railway structures is very popular and extensively used in Europe. Moreover, in Poland there is a significant number of them. This work considers the possibility of strengthening these objects with using the corrugated steel plates as the material which is already being used in soil-steel structures. The usage of steel coatings is very con-venient while providing any construction works as they are taking place underneath the arch. This is not causing any restrictions of movements on the bridge as only a small area under the bridge is oc-cupied. According to different coatings geometry, this kind of technology is being presented based on already existing objects as the examples. The following study proves high efficiency of strength-ening the masonry vaults with the usage of corrugated steel plates.

Design of small-area and high-efficiency DC-DC converter for 1 T SRAM

2012 ◽  
Vol 19 (2) ◽  
pp. 417-423
Author(s):  
Jae-hyung Lee ◽  
Li-yan Jin ◽  
Yi-ning Yu ◽  
Ji-hye Jang ◽  
Kwang-il Kim ◽  
...  
Keyword(s):  
Small Area ◽  
High Efficiency
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