High Performance Step -down Noise- Reduction Transformer Constructed With C - Core

2005 ◽  
Author(s):  
T. Yanada ◽  
O. Ichinokura
Keyword(s):  
Noise Reduction ◽  
High Performance ◽  
Step Down

scholarly journals The Role of Alteration of Glutamic Acid and Gaba in Learning and Memory Impairment of Rats Induced by Aluminum

2005 ◽  
Vol 3 (2) ◽  
pp. 97-101
Author(s):  
Q. Niu ◽  
P. Niu ◽  
Q. Zhang ◽  
L. Wang ◽  
S. He ◽  
...  
Keyword(s):  
Amino Acids ◽  
Cerebral Cortex ◽  
Glutamic Acid ◽  
Learning And Memory ◽  
Memory Impairment ◽  
High Performance ◽  
Gamma Aminobutyric Acid ◽  
Aluminum Exposure ◽  
Step Down

Aluminum exposure has been reported to be related to learning and memory impairment. This study examines the role of aluminum in alterating amino acids of the cerebral cortex of rats. The Step-down type tests were performed to investigate the alteration of learning and memory of rats induced by aluminum. The amino acids in the cerebral cortex were detected by high performance liquid chromatography (HLPC). Results show that the amounts of aluminum in the cerebral cortex increased by 5.0mgAl3+/(Kg·BW) group and 10.0mg Al3+/(Kg·BW) group. In the Step-down type test, the EN1 increased significantly in the Al3+ 10.0mg/(Kg·BW) group. The latency shortened obviously and the EN2 increased significantly in the 10.0mg Al3+/(Kg·BW) group. The content of Glu (Glutamic acid) increased but the content of GABA (gamma-aminobutyric acid) decreased significantly in the 10.0mg Al3+/(Kg·BW) group. This present study shows evidence that the disorder of amino acid neurotransmitters system plays an important role in the impairment of learning and memory of rats induced by aluminum.

Discussion on the Wavelet Adjustment Factor Threshold Noise Reduction Technology Based on DSP

2011 ◽  
Vol 317-319 ◽  
pp. 1201-1204
Author(s):  
Zi Ran Liu ◽  
Tao He ◽  
Yuan Yuan He ◽  
Yu Xi Yu
Keyword(s):  
Signal Processing ◽  
Noise Reduction ◽  
High Performance ◽  
Vibration Signal ◽  
Adjustment Factor ◽  
Reconstructed Signal ◽  
Actual Signal ◽  
Soft Threshold ◽  
Reduction Effect ◽  
Fixed Bias

Because of discontinuity at threshold, hard threshold de-noising leads to the additional oscillation at threshold when reconstructing the signal, so that the smoothness of the de-noised signal becomes weak; Soft threshold de-noising method can guarantee the good continuity of the signal. However, for the existence of the fixed bias between the estimated threshold and actual threshold, there are also deviations between the reconstructed signal and the actual signal existing deviations too. In this work, by using the high performance DSP as a signal processing tool, we reduced the noise of actual measured vibration signal collected from headstock of CA6140 lathe. By comparing, the result is the same as the noise reduction simulation calculated from MATLAB, which demonstrates the noise reduction effect of wavelet adjustment factor threshold de-noising apparently.

A power step-down approach to extended high performance of ELM-free H modes in JET

1997 ◽  
Vol 37 (8) ◽  
pp. 1067-1082 ◽  
Author(s):  
F.B Marcus ◽  
B Balet ◽  
N Deliyanakis ◽  
R Giannella ◽  
C.W Gowers ◽  
...  
Keyword(s):  
High Performance ◽  
Step Down

NONISOLATED MULTIPHASE HALF-BRIDGE-BUCK TOPOLOGY WITH INHERENT CURRENT SHARING CAPABILITY AND SOFT-SWITCHING AND COUPLED-INDUCTORS CURRENT-DOUBLER

2004 ◽  
Vol 13 (03) ◽  
pp. 443-466
Author(s):  
JABER A. ABU-QAHOUQ ◽  
HONG MAO ◽  
ISSA BATARSEH
Keyword(s):  
Duty Cycle ◽  
High Performance ◽  
Dynamic Performance ◽  
Soft Switching ◽  
Coupled Inductors ◽  
Current Sharing ◽  
Highly Sensitive ◽  
High Dynamic ◽  
Step Down ◽  
Current Ripple

Point-of-load DC–DC converter requirements and design are increasingly becoming stricter than ever. This is due to the required tight dynamic tolerances allowed for supply voltages and high dynamic performance demand coupled with very high power density. Moreover, as the required converter output voltage becomes smaller, higher voltage step-down ratio is required, which results in smaller switching duty cycle in the nonisolated topologies. Step-down transformer with large turns ratio is used in the isolated topologies to step-down the voltage and keep larger duty cycle. Most of the nonisolated DC–DC topologies are buck-derived and unfortunately work at hard-switching which degrades the efficiency. DC–DC interleaved buck topologies were proposed but are highly sensitive to interleaved phases asymmetry and require high performance current sharing loop. In this paper, a nonisolated multiphase nonisolated half-bridge-buck topology is presented. This topology makes it possible to achieve soft-switching, works at larger switching duty cycle with lower output voltages, and does not require current sharing loop because of the inherent current sharing capability. Moreover, a coupled-inductor current doubler topology is also presented in this paper allowing higher step-down ratio and lower output current ripple. Theoretical analysis and experimental results are presented.

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