Ten-Element MIMO Array Using Stable Current Nulls for 5G smartphones

2021 ◽  
Author(s):  
Aidi Ren ◽  
Zhanhao Zhang ◽  
Haoran Yu ◽  
Hong-Wei Yu
Keyword(s):  
Stable Current

A Stable Field Emission Electron Source

1977 ◽  
Vol 35 ◽  
pp. 58-59
Author(s):  
W.R. Bottoms ◽  
G.B. Haydon
Keyword(s):  
Field Emission ◽  
Signal To Noise Ratio ◽  
High Brightness ◽  
Electron Sources ◽  
Brightness Field ◽  
Current Densities ◽  
Properties Of Materials ◽  
Stable Field ◽  
Stable Current ◽  
Careful Design

There is great interest in improving the brightness of electron sources and therefore the ability of electron optical instrumentation to probe the properties of materials. Extensive work by Dr. Crew and others has provided extremely high brightness sources for certain kinds of analytical problems but which pose serious difficulties in other problems. These sources cannot survive in conventional system vacuums. If one wishes to gather information from the other signal channels activated by electron beam bombardment it is necessary to provide sufficient current to allow an acceptable signal-to-noise ratio. It is possible through careful design to provide a high brightness field emission source which has the capability of providing high currents as well as high current densities to a specimen. In this paper we describe an electrode to provide long-lived stable current in field emission sources.The source geometry was based upon the results of extensive computer modeling. The design attempted to maximize the total current available at a specimen.

scholarly journals Effect of Single Walled Carbon Nanotube as Counter Electrode on Laser-deposited Fe2O3 and TiO2 Films Solar Cells

2009 ◽  
Vol 1 (3) ◽  
pp. 430-437 ◽  
Author(s):  
B. Ahmmad ◽  
Y. Kusumoto ◽  
M. Abdulla-Al-Mamun ◽  
A. Mihata ◽  
H. Yang
Keyword(s):  
Solar Cells ◽  
Carbon Nanotube ◽  
Counter Electrode ◽  
Counter Electrodes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Ito Glass ◽  
Stable Current ◽  
Fe2o3 Film ◽  
Swnt Film

Laser-deposited Fe2O3 films or dye-fixed TiO2 films were prepared for solar cells. For both the cells, a single walled carbon nanotube (SWNT) film or a Pt-loaded SWNT film, prepared by simply pasting over ITO glass, was used as a counter electrode. Stable current (I)-voltage (V) curves were found under UV-visible light irradiation using water containing KI and I2 as an electrolyte. A comparison of I-V curves was made for Pt alone and SWNT alone films used as a counter electrode. Almost similar efficiency was found by using both types of counter electrodes. However, enhanced efficiency was obtained for the Pt-loaded SWNT-film counter electrode.Keywords: TiO2; Fe2O3 film; Solar cell; SWNT.© 2009 JSR Publications. ISSN: 2070-0237(Print); 2070-0245 (Online). All rights reserved.DOI: 10.3329/jsr.v1i3.2631      J. Sci. Res. 1 (3), 430-437 (2009)

MODELING OF STABLE CURRENT GENERATORS FOR MICROWAVE AMPLIFIERS

2020 ◽  
Author(s):  
Ю.А. НИКИТИН ◽  
А.Д. СЕДИНИН ◽  
В.А. ЮРОВА
Keyword(s):  
Dynamic Range ◽  
Comparative Modeling ◽  
Radio Communication ◽  
Current Mirrors ◽  
Microwave Amplifiers ◽  
Computer Package ◽  
Stable Current

В устройствах радиосвязи и электроники усилители во многом определяют динамический диапазон и чувствительность аппаратуры. Возможно построение усилительных структур на управляемых токовых зеркалах. В работе рассмотрены варианты построения квазилинейных усилительных структур на токовых зеркалах. С помощью пакета MicroCap 11 проведено их моделирование и сравнение. In radio communication and electronics devices, amplifiers largely determine the dynamic range and sensitivity of the equipment. It is possible to build amplifying structures using controlled current mirrors (CM). The paper considers variants of construction of broadband quasi-linear amplifying structures on CM. Their comparative modeling was carried out with the help of the computer package Micro Cap 11.

scholarly journals MHD stability and disruptions in the SPARC tokamak

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
R. Sweeney ◽  
A. J. Creely ◽  
J. Doody ◽  
T. Fülöp ◽  
D. T. Garnier ◽  
...  
Keyword(s):  
Safety Factor ◽  
Eddy Currents ◽  
Runaway Electron ◽  
Vacuum Vessel ◽  
Current Profile ◽  
Tearing Modes ◽  
Mhd Stability ◽  
Data Driven Approach ◽  
Operating Space ◽  
Stable Current

SPARC is being designed to operate with a normalized beta of $\beta _N=1.0$ , a normalized density of $n_G=0.37$ and a safety factor of $q_{95}\approx 3.4$ , providing a comfortable margin to their respective disruption limits. Further, a low beta poloidal $\beta _p=0.19$ at the safety factor $q=2$ surface reduces the drive for neoclassical tearing modes, which together with a frozen-in classically stable current profile might allow access to a robustly tearing-free operating space. Although the inherent stability is expected to reduce the frequency of disruptions, the disruption loading is comparable to and in some cases higher than that of ITER. The machine is being designed to withstand the predicted unmitigated axisymmetric halo current forces up to 50 MN and similarly large loads from eddy currents forced to flow poloidally in the vacuum vessel. Runaway electron (RE) simulations using GO+CODE show high flattop-to-RE current conversions in the absence of seed losses, although NIMROD modelling predicts losses of ${\sim }80$  %; self-consistent modelling is ongoing. A passive RE mitigation coil designed to drive stochastic RE losses is being considered and COMSOL modelling predicts peak normalized fields at the plasma of order $10^{-2}$ that rises linearly with a change in the plasma current. Massive material injection is planned to reduce the disruption loading. A data-driven approach to predict an oncoming disruption and trigger mitigation is discussed.

Design of Dimmable Quasi-Resonant Fly Back LED Driver Based on OZ9992

2013 ◽  
Vol 404 ◽  
pp. 445-449
Author(s):  
Guang Ming Chen ◽  
Shuang Wu ◽  
Jia Hui Shen ◽  
Ke Zhao
Keyword(s):  
Constant Current ◽  
It Use ◽  
Led Driver ◽  
Broad Application ◽  
Switching Losses ◽  
Zero Voltage ◽  
Stable Current ◽  
Application Prospects

The paper designs a 30W dimmable constant current LED driver. It is designed by O2Micros OZ9992 control chip, and it use quasi-resonant flyback topology. It can achieve zero voltage to reduce switching losses. The LED driver has higher efficiency and can provide a stable current for LED lamps. It has good dimming performance, and is easy to operate. It is suitable for home, hotel and other occasions, and has broad application prospects.

Development of Comfort Solar Clothing

2010 ◽  
Vol 113-116 ◽  
pp. 698-701 ◽  
Author(s):  
Xiu Chen Wang ◽  
Zhe Liu
Keyword(s):  
Solar Energy ◽  
Environmental Condition ◽  
Human Comfort ◽  
Flexible Materials ◽  
Favorable Environment ◽  
Stable Current ◽  
Energy Shortage

Aiming at current environmental condition of energy shortage and excessive emission, this paper presents the development of solar energy clothing on human comfort. In this clothing, solar flexible materials are made into appropriate part of garment. In ensuring the comfort of human, this garment can accumulate solar energy, safely output stable current. So this clothing has the function of providing power. After a number of experiments and analysis, this clothing is proved that it has convenient, practical, favorable environment, and comfort for human.

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