A New Diterpenoid and other Constituents from Acanthopanax Brachypus Harms

Abstract

Phytochemical investigation of the stem bark of Acanthopanax brachypus afforded a new labdanetype diterpene glycoside, 3a-trans-sinapoyloxy-jhanol 18-O-b-D-glucopyranoside (1), together with four known compounds, including one diterpene acid, acanthoic acid (2), one coumarin, isofraxidin (3), one phenolic glycoside, sasanquin (4), as well as one chalcone glycoside, okanin 4-methyl ether-3¢-O-b-D-glucopyranoside (5). All of the structures were characterized by means of spectroscopic methods, including 1 H, 13 C, 2D-NMR and HR-MS, as well as chemical methods and comparison with the literature data.

Modeling and Simulation Study on the Complex Seepage Mechanism of Porous Electrode for a Proton Exchange Membrane Fuel Cell

“…In the cell, the development of PEMFC was restricted by the performance of the porous electrode which is characterized as the power converter, thus the modeling and simulation study on the complex seepage mechanism of porous electrode not only is used to guide the optimal design of fuel cell, but also contribute to reduce the cost and experimental expenses. so far, considerable simulation research of the PEMFC has been carried out on the one-dimension, two-dimension and three-dimension [1,2,3,4,5,6], however, to get a good understanding of these complex transport phenomena as well as the effect on the cell performance , reasonable numerical simulation is thus essential [7,8,9,10,11,12,13,14,15] and this study remains challenge.…”