Enrichment of pineapple aroma compounds from model solutions by sweeping-gas and vacuum-pervaporation

Our experiments were based on a model solution containing five of the main pineapple aroma components. Both sweeping-gas pervaporation and vacuum-pervaporation methods were carried out. Measurements were performed at different temperatures and feed flow rates. The purposes of this study were to examine applicability of the two pervaporation methods in reference to the pineapple aroma recovery, the effects of the operating parameters on the process, and modelling the pervaporation process by resistance-in-series model. Higher enrichment could be reached with vacuum-pervaporation than the sweeping-gas method. The separation process is determined by the diffusion of compounds in the membrane, thus the resistance in the boundary layer at liquid side is negligible. Based on performed experiments, the pervaporation process can be applied in beverage industry for aroma recovery

A Zala és befolyói makroszkopikus gerinctelen faunája | On the macroinvertebrate fauna of river Zala and its inflows

A Zala és befolyói makroszkopikus gerinctelen faunája kevéssé is-mert, habár számos faunisztikai jellegű gyűjtést végeztek ezen a területen. Dolgozatunkban átfogó irodalmi áttekintést adunk a Zala és befolyói makrogerinctelen faunájáról, illetve saját, 2007-ben végzett faunisztikai felmérésünk eredményeit mutatjuk be. | Although many faunistical investigations were carried out in this area, the aquatic macroinvertebrate fauna of River Zala and its inflows is poorly known. In this paper a compilation is given on the macroinvertebrate fauna of River Zala and its inflows, and the results of own faunistical investigations carried out in 2007 are presented

Low-lying S 2 states of the singly charged carbon ion

In this work, we report benchmark variational calculations of the five lowest doublet S-states of the C+ ion. The wave functions of this five-electron system are expanded in terms of 16 000 all-particle explicitly correlated Gaussians (ECGs) whose nonlinear variational parameters are subject to extensive optimization. The motion of the finite-mass nucleus is explicitly included in the Hamiltonian, while relativistic corrections to the energy levels are computed in the framework of the perturbation theory. Lowest-order quantum electrodynamics (QED) corrections are also estimated. The results obtained for the energy levels enable the determination of transition frequencies with the accuracy that approaches the available experimental data and may open up avenues for future determination of nuclear charge radii of carbon isotopes. © 2020 American Physical Society.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

S 2 Rydberg spectrum of the boron atom

Benchmark variational calculations of the lowest ten Rydberg S2 states of two stable isotopes of the boron atom (B10 and B11) are reported. The nonrelativistic wave functions of this five-electron system are expanded in terms of 16 000 all-particle explicitly correlated Gaussians (ECGs). The ECG nonlinear exponential parameters are extensively optimized using a procedure that employs the analytic gradient of the energy with respect to these parameters. A finite nuclear mass value is used in the calculations and the motion of the nucleus is explicitly represented in the nonrelativistic Hamiltonian. The leading relativistic corrections to the energy levels are computed in the framework of the perturbation theory. The lowest-order quantum electrodynamics corrections are also estimated. The results obtained for the energy levels enable determination of interstate transition frequencies with accuracy that approaches the available experimental spectroscopic data. © 2021 American Physical Society.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]