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Vapor−liquid equilibrium data (p, T, x, ρ) for the carbon dioxide + ethyl propanoate (EP) and carbon dioxide + ethyl acetate (EA) systems were measured from 313 K to 393 K and in the pressure range from 2.96 MPa to 11.97 MPa. The measurements were carried out in a cylindrical autoclave with a moveable piston and an observation window. The results show that the solubilities of CO2 in ethyl propanoate and ethyl acetate strongly increase with pressure, but the concentration of ethyl propanoate or ethyl acetate in the gas phase only slightly increases. The experimental data were correlated using the Peng−Robinson equation of state (EOS) with the two-parameter van der Waals mixing rule.

The four‐crystal camera is one of the major items of equipment of the topography station at the Beijing Synchrotron Radiation Facility. The design and some applications of this camera are presented.

A white‐radiation dynamic topography experimental system has been established at the BSRF (Beijing Synchrotron Radiation Facility) and is now in operation. Each part of this system is described in this paper, with particular emphasis given to the PC‐based online control system, the X‐ray video‐imaging system and the image‐treatment system. Moreover, some of the experimental results, such as the phase transition of KNbO3nonlinear optical crystals and of blue bronze charge‐density‐wave material, are briefly presented.