ELDAR, a knowledge base system on microcomputer for electrolyte solutions. The factual knowledge of ELDAR

Abstract

The knowledge base system ELDAR (ELectrolyte DAta Regensburg), consisting of data base, method base, rule base, and communication manager, classifies the knowledge of electrolyte solutions into factual, algorithmic, and rule knowledge. In this paper information is given on the factual knowledge of ELDAR and the mapping of facts in Codd's relational data model with an extension of its "1st Normal Form" to repeating attributes. ELDAR offers equal user interfaces for all factual knowledge services, such as literature, data, thesaurus, module, parameter, basic data, and rule retrieval.

Dielectric Spectroscopy of Aqueous Solutions of KCl and CsCl

“…As previously reported, 22 the effective conductivity was obtained by fitting the experimental total loss curve to eq 1. The κ e values so obtained are generally 1-2% smaller than conventional (low-frequency) conductivities 20 with slightly larger deviations at high concentrations. For the correction of the interferometer data, κ values from the literature were used.…”

“…For the correction of the interferometer data, κ values from the literature were used. 20 Provided sufficient reproducibility was obtained for κ e ((2%), at least two VNA spectra and, when determined, the interferometer data were combined after a correction of η′′ for the ohmic loss, κ/(2πν o ). As can be seen from Figures 1-3, there is in general a seamless fit between the low-and high-frequency data, although, as is usually observed for electrolyte solutions, the noise increases with increasing concentration because of the increasing conductivity contribution.…”

“…The salts KCl (Ajax Chemicals, Australia, AR grade, 99.8% purity) and CsCl (BDH, UK, AR grade, 99.9%) were dried at 50 °C for ∼4 h under vacuum (∼1 kPa) and were stored in a vacuum desiccator. Densities required for the calculation of water concentrations were obtained from the ELDAR database, 20 as were the conductivities of KCl(aq) and CsCl(aq), which were used for kinetic depolarization corrections.…”

Phase Equilibria in Binary and Ternary Hydrothermal Systems

“…The values were extracted from the papers in national and international journals, monographs and collected articles, as well as from the deposited materials, reports and dissertations. For literature search, besides the Chemical Abstracts Data Base, the database system ELDAR (Prof. J. Barthel, Institute for Physical and Theoretical Chemistry, the Regensburg University, Germany) (Barthel and Popp, 1991) and the databank for water-organic systems (Prof. N.I. Smirnova, Prof. A.I.…”

Factual data banks and their application to the synthesis and design of chemical processes and the development and testing of thermophysical property estimation methods

“…Onken, 1973) for vapor-liquid equilibrium (VLE) data of normal and high boiling components, later followed by, e.g., the Berlin Data Bank (H. Knapp) for phase equilibria of low boiling components and DETHERM (1978, [16]), a project to merge different data banks into a unified form. Out of these efforts, DDB survived as an active producer while DETHERM serves as one of the data bank platforms to provide data from the DDB, ELDAR [17], and several other, mostly discontinued data banks to the different users in industry and academia. The current status and applications of the DDB will be given in more detail later on.…”