ISSN:0005-9021    

DOI:10.1002/bbpc.19810850902

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractPrevious theoretical analyses of several n‐paraffins are extended to recentPVTmeasurements forn= 11 and 12. The results are combined with the earlier ones to obtain interpolation equations for the characteristic scaling and other parameters of the theory as functions of chainlength. This makes it possible to predict the complete equation of state of a n‐paraffin fluid. Finally we discuss the extension of these considerations to mixtu

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850903

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractThe liquid‐solid equilibrium temperatures of organic binary mixtures are treated in order to have the excess chemical potential. This thermodynamic quantity is statistically treated following the groups interaction theory and the interchange parametres are derivate

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850904

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractExcess enthalpiesHEof isopropanol + n‐heptane and isopropanol + isooctane mixtures are reported measured at 298 K and various pressures up to 553 bar. TheHEvalues are endothermic and show a remarkable decrease with pressure. The real associated solution model has been applied taking into account the volume change due to hydrogen bonding of the alcohol and was found to be insufficient for describing quantitatively the pressure dependence observe

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850905

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractPVTdata for pure water have been measured between 20°C. and 600°C. for pressures between 100 and 4000 bar using an internally healed pressure vessel. The accuracy of the measured specific volumes is 0.2 percent or better. The volume isotherms were fitted by the Tait equation with an average absolute deviation of the experimental points from the smoothed curves of 0.02% below and of 0.05% above 200

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850906

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractStarting from neutron scattering experiments on the species CDCl3, CD35Cl3, CD37Cl3and CHCl3the expansion coefficients of the generalized pair correlation functiong00000(R),g00101(R),g00202(R), andg00110(R) are determined and analyzed quantitatively, thus providing preferred positions and orientations of the molecules in liquid chloroform. From the same set of experimental data the chlorine‐chlorine pair correlation function and the weighted sum of the chlorine‐hydrogen and chlorine‐carbon pair correlation functions are evaluated. The most probable configuration between two chloroform molecules in the liquid phase is derived from the position of the first peak of the corresponding pair correlation function. Both ways of description yield a consistent structural picture; namely the dipole axes are inclined and the hydrogen atoms point into the hollow between two chlorine

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850907

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractA new reference system for the treatment of molecular fluids within the framework of thermodynamic perturbation theory is presented. The basic ingredient of our approach is a potential transformation which allows us to view molecular liquids and gases as mixtures of formally independent molecular interaction sites (IMIS model). Some relations between our method and the RAM theory are discussed.

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850908

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractBinary diffusion coefficients are reported for the systems Ne‐CO2, Kr‐CO2and Xe‐CO2over the temperature range 277 – 323 K, and combined with accurate second virial coefficients to obtain (m, 6, 8) potentials for the unlike‐interactions. These potentials, together with others for the like‐interactions, have been used to calculate binary viscosities for comparison with ex

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850909

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractDynamic light scattering and electric birefringence have been used together to measure both translational and rotational diffusion constants of nucleosomes oligomers. Assuming an ellipsoïdic model, the overall size and shape of these oligomers have been calculated; incertitude determinations, carefully carried out, give an idea of the actual validity of this type of results. Monomer and dimer can be considered as weakly elongated ellipsoïds, while trimer to hexamer are better represented by spheres. De la Torre and Bloomfield modelisation has also been applied to interpret our experimental results, leading for the monomer and dimer to dimensions which are reasonnably well in accordance with electron microscopic determination

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850910

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY

摘要:

AbstractA detailed analysis of the hypo‐ and hyper‐chromic intensity changes as well as the changes in frequency and band shape in the Raman spectra of poly(m1A) upon melting has been made using a newly developed Raman difference technique. An interpretation of these changes allows us to suggest a structure for the double‐helix of this polymer in neutral solution which resembles that of poly(A) in acid pH. In the helix the backbone geometry is shown to be similar to the C 3 endo or A genus and the existence of a hydrogen bond is inferred from the asymmetric band shape of 1100 cm−1PO−2stretching vibration wich is not found either in self‐stacked poly(A) at neutral pH. It is expected that the application of the Raman difference technique will result in a detailed description of conformational features of these important macromolecules which cannot be drawn from the resuits of other opti

ISSN:0005-9021    

DOI:10.1002/bbpc.19810850911

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1981

数据来源: WILEY