An equation for the density of hydrogen gas has been developed that agrees with the current standard to within 0.01 % from 220 K to 1000 K with pressures up to 70 MPa, to within 0.01 % from 255 K to 1000 K with pressures to 120 MPa, and to within 0.1 % from 200 K to 1000 K up to 200 MPa. The equation is a truncated virial-type equation based on pressure and temperature dependent terms. The dens...

Multiphoton absorption is an intensity dependent nonlinear effect related to the excitation of virtual intermediate states. In present work, multiphoton ionization and dissociation formic acid molecule (HCOOH) by interaction with photons from 532 Nd: YAG laser at different intensities are discussed, using carrier gases. The induced fragmentation-ionization patterns show up 17 fragments channels...

Both known and new CC3-based porous organic cages are prepared and exposed to acidic SO2 in vapor and liquid conditions. Distinct differences in the stability of the CC3 cages exist depending on the chirality of the diamine linkers used. The acid catalyzed CC3 degradation mechanism is probed via in situ IR and a degradation pathway is proposed and supported with computational results. CC3 cryst...

Abstract The transport of oxygen, nitrogen, and hydrocarbons C 1 –C 4 in polyimides based on 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) biphenyl-3,3',4,4'-tetracarboxylic acid dianhydride (BPDA) diethyl toluene diamine (DETDA) has been studied. dependences the diffusion coefficient diffusant effective diameter solubility coefficients Lennard–Jones potential pair interaction have...

A thermodynamic model has been developed to calculate burning speed and entropy production of transient expending spherical laminar flame in an enclosed vessel. The model also predicts the particle trajectories of both unburned and burned gases in the vessel. The input to this model is the dynamic pressure rise due to combustion process. The unburned gases are divided into three regions: The co...

BACKGROUND Many methods are used for determining the Anaerobic Threshold (AT) by means of sophisticated ergospirometer. OBJECTIVE To test the AT variation, detected by mathematical models and visual inspection, when low cost ergospirometer is used and intended for clinical application. METHODS Seventy nine apparently healthy subjects were volunteers in this study; from these, 57 men. The VO...

1 Grupo Interdisciplinar de Sistemas Complicados (GISC), Departamento de Matemáticas, Universidad Carlos III de Madrid, Avda. de la Universidad 30, 28911 Leganés, Madrid, Spain. 2 Current Address: Institut für Theoretische Physik II, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany; e-mail: [email protected] 3 Department of Chemical Engineering, University of Amsterdam, Nieu...