Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Friedrich G. Helfferich"'
Experts in soil and environmental sciences as well as in the theory of wave propagation and numerical modeling methods provide a comprehensive account of different aspects of pollutant migration in soils, aquifers, and other geological formations. Em
Publikováno v:
Industrial & Engineering Chemistry Research. 38:3588-3605
Distillation columns with sharp separations exhibit severely nonlinear behavior, which has been known to cause difficulties in column control and design. Such a column is characterized by sharp composition and temperature variations in the column. Pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d74c84051e51c8c2b766a5ccfe185360
https://doi.org/10.1021/ie990038o
https://doi.org/10.1021/ie990038o
Autor:
Friedrich G. Helfferich
Publikováno v:
Journal of Chromatography A. 768:169-205
This third instalment on non-linear waves examines in detail the chromatographic behavior of multicomponent systems whose sorption equilibria are uniformly competitive and without selectivity reversals. This very common class includes systems with mu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8421c612011519e7826878d6e95b5874
https://doi.org/10.1016/s0021-9673(96)00573-0
https://doi.org/10.1016/s0021-9673(96)00573-0
Publikováno v:
AIChE Journal. 42:2743-2760
High-purity distillation columns are typically difficult to control because of their severely nonlinear behavior reflected by their sharp composition and temperature profiles. The dynamic behavior of such a column, as characterized by the movement of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21d8594a6c6f0f96399c59b3f5fa93bb
https://doi.org/10.1002/aic.690421006
https://doi.org/10.1002/aic.690421006
Publikováno v:
Journal of Chromatography A. 734:7-47
This second instalment on non-linear waves examines in detail the effects caused by interactions between different solutes in multicomponent systems. Emphasis is on concepts and qualitative insight, and mathematics is kept at a minimum. To avoid unne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d1e0b754cb437c21e243e72278b8bf6
https://doi.org/10.1016/0021-9673(95)01067-x
https://doi.org/10.1016/0021-9673(95)01067-x
Autor:
Friedrich G. Helfferich
Publikováno v:
Journal of Chromatography A. 634:334-337
Golay in 1964 posed the paradox that it should theoretically be possible to conduct an operation of single-component chromatography with linear isotherm and high column loading in such a way that the entropy of the system is decreased. The paradox is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bbe1549e635bb8ff99b604e5ccecb92
https://doi.org/10.1016/0021-9673(93)83022-k
https://doi.org/10.1016/0021-9673(93)83022-k
Autor:
Friedrich G. Helfferich
Publikováno v:
Chemical Engineering Science. 48:681-686
Steady-state multiplicity under idealized conditions in a single column, or in a column section with fixed entry conditions at both ends, depends critically on whether the model postulate infinite or finite column length or mass-transfer rates. Like
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77175ab8aa98eb5ec78cd850ccf18c68
https://doi.org/10.1016/0009-2509(93)80135-d
https://doi.org/10.1016/0009-2509(93)80135-d
Autor:
Peter W. Carr, Friedrich G. Helfferich
Publikováno v:
Journal of Chromatography A. 629:97-122
Cause and effect in non-linear chromatography are examined from the point of view of wave theory. This first of four instalments is restricted to single-component systems and examines monotonic concentration variations and chromatographic peaks and b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c36aec4e775dcf564a0d5fe67f2e827a
https://doi.org/10.1016/0021-9673(93)87026-i
https://doi.org/10.1016/0021-9673(93)87026-i
Autor:
Friedrich G. Helfferich
Publikováno v:
Reactive Polymers. 18:91-94
It is only with quite some reluctance that I have let myself be persuaded to write about the first ten years of Reactive Polymers. Is it not true that the worst person to review a play is an actor who had a major role? The "play", be it a Broadway pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::269d6f99141522c5b48cd9f17a23e887
https://doi.org/10.1016/0923-1137(92)90246-x
https://doi.org/10.1016/0923-1137(92)90246-x
Autor:
Friedrich G. Helfferich
Publikováno v:
Chemical Engineering Science. 46:3320-3323
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::675d7e719cb2737d26e7b39afb2f41c8
https://doi.org/10.1016/0009-2509(91)85039-z
https://doi.org/10.1016/0009-2509(91)85039-z