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The paper firstly interprets
the differences between electromechanical transients program BPA and
electromagnetic transients program EMTDC in the field of principle, model and
algorithm. Then the authors carry out the simulation based on single-machine
infinite-bus system and draw some conclusions. The time consumption of the
simulation using EMTDC is much longer than the simulation using BPA under the
same length of time. The results of BPA are close to those of EMTDC under
steady conditions. The fundamental frequency component of the EMTDC results
seems closer to the BPA results than its original value, but they still away
from completely consistent. In this simulation of single-machine infinite-bus
system, the transient stability results of BPA and EMTDC are close, but the
results of BPA are apt to be more conservative. All the conclusions above have
a certain reference value to both hybrid simulation and comprehensive analysis
method in the study of the AC/DC digital simulation of large power grid.
A ladder-like structure compound formed by cadmium (II) and anionic nitronyl nitroxide,
(where NITpBA = 2-(4-carboxyphenyl)4,4,5,5-tetramethyl-4,5-dihydro-imidazol-1-oxyl-3-oxide), has been synthesized and
characterized. X-ray analysis reveals that the compound
1 crystallizes in the monoclinic P21/c (No. 14) space group, and [Cd2(NITpBA)4(H2O)4]
units are linked into infinite chains by radical bridging ligands.
binuclear complexes, [M2(μ-NITpBA)4(H2O)2] (M = Zn 1 and Cu
2) [where NIpBA = 2-(4-carboxyl-phenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide], were stylized and characterized. Magnetic susceptibility measurements revealed antiferromagnetic exchange interactions
in two complexes.
Four a-galactosyl phytosphingosine 2,6’-diamide analogs
were prepared from 2,6’-diamino a-galactosylphytosphingosine
and the aromatic-bearing carboxylic acids. After purification with High
Performance Liquid Chromatography, a flowcytometry for the four compounds for
stimulation of human Va24+/Vb11+ NKT cell populations was carried out. Additional keto groups on the acyl
chains of the 2,6’-diamide compound was associated with the enhanced stimulating effect.