Passive Method to Measure Reentry Radiation in the Presence of Ablative Products

A direct passive method for measuring water and contaminant fluxes in porous media

Journal of Contaminant Hydrology ◽

10.1016/j.jconhyd.2004.06.005 ◽

2004 ◽

Vol 75 (3-4) ◽

pp. 155-181 ◽

Cited By ~ 107

Author(s):

Kirk Hatfield ◽

Michael Annable ◽

Jaehyun Cho ◽

P.S.C. Rao ◽

Harald Klammler

Keyword(s):

Porous Media ◽

Passive Method

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Research on Passive Method of Doppler Coefficient of Underwater High Speed Moving Target

2021 IEEE International Conference on Power Electronics, Computer Applications (ICPECA) ◽

10.1109/icpeca51329.2021.9362626 ◽

2021 ◽

Author(s):

Nan Zou ◽

Junyi He ◽

Feng Liu ◽

Chenmu Li ◽

Yunbo Hao

Keyword(s):

High Speed ◽

Moving Target ◽

Passive Method

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A passive method for scanning the celestial sphere.

Journal of Spacecraft and Rockets ◽

10.2514/3.29712 ◽

1969 ◽

Vol 6 (7) ◽

pp. 846-847 ◽

Cited By ~ 2

Author(s):

ALBERT J. FLEIG

Keyword(s):

Passive Method ◽

Celestial Sphere

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Over/Undervoltage and Undervoltage Shift of Hybrid Islanding Detection Method of Distributed Generation

The Scientific World JOURNAL ◽

10.1155/2015/654942 ◽

2015 ◽

Vol 2015 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

Manop Yingram ◽

Suttichai Premrudeepreechacharn

Keyword(s):

Control System ◽

Distributed Generation ◽

Hybrid Method ◽

Detection Method ◽

System Simulation ◽

Detection Methods ◽

Islanding Detection ◽

Active Method ◽

Passive Method ◽

Simulation Results

The mainly used local islanding detection methods may be classified as active and passive methods. Passive methods do not perturb the system but they have larger nondetection zones, whereas active methods have smaller nondetection zones but they perturb the system. In this paper, a new hybrid method is proposed to solve this problem. An over/undervoltage (passive method) has been used to initiate an undervoltage shift (active method), which changes the undervoltage shift of inverter, when the passive method cannot have a clear discrimination between islanding and other events in the system. Simulation results on MATLAB/SIMULINK show that over/undervoltage and undervoltage shifts of hybrid islanding detection method are very effective because they can determine anti-islanding condition very fast.ΔP/P>38.41% could determine anti-islanding condition within 0.04 s;ΔP/P<-24.39% could determine anti-islanding condition within 0.04 s;-24.39%≤ΔP/P≤ 38.41% could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of-24.39% ≤ΔP/P ≤38.41% at which the control system of inverter injected a signal of undervoltage shift as necessary to check if the occurrence condition was an islanding condition or not.

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