Groupie - An Environment supporting Group-Oriented Architecture Development

The paper presents an architecture definition language and various mappings to different programming languages. In addition, a major new idea is that the language contains features which are exploited to define a concept to support cooperative distributed development of architectural descriptions. Besides the language and group-ware concepts the paper sketches functionality and implementation of the corresponding support environment called Groupie. The section describing the implementation of Groupie illustrates the suitability of an object database to build software engineering environments supporting multiple users

Dedicated Object Management System Benchmarks for Software Engineering Applications

Non-standard database systems become available now, even as commercial products. They overcome a lot of deficiencies of relational systems w.r.t. their use in engineering applications like computer-aided design or software engineering. Their rather sophisticated functionality especially concerning the manipulation of complex objects makes them highly attractive for engineering applications. If being used as the central database of a rather complex application they could however still become a bottleneck w.r.t. performance. This paper presents a new way how to define a special purpose benchmark which enables to select the fastest database system for a particular software engineering application. It is argued that existing benchmarks are not appropriate to support such a selection, because they neglect important application specific characteristics which significantly influence the database performance

Databases for Software Engineering Environments - The Goal has not yet been attained

We argue that, despite a substantial number of proposed and existing new database systems, a suitable database system for software development environments and especially process-centred environments does not yet exist. We do so by first reviewing and refining the requirements for such systems. We then review a number of available and archetypical database systems and show that they do not meet these requirements

Groupie - An Environment Supporting Group-Oriented Architecture Development

The report presents an architecture definition language and various mappings to different programming languages. In addition, a major new idea is that the language contains features which are exploited to define a concept to support cooperative distributed development of architectural descriptions. Besides the language and group-ware concepts the paper sketches functionality and implementation of the corresponding support environment called Groupie. The section describing the implementation of Groupie illustrates the suitability of an object database to build software engineering environments supporting multiple users. 1 Introduction The architectural description has become an important, if not the most important document of a software systems life cycle. This description provides a possibility to structure a software system into well-defined parts called modules, subsystems etc. and to encapsulate the main design decisions within those parts. It serves as an important basis to guar..

The Solubility of Gases in Liquids 4. Calculations on Gas Solubilities in Hexafluorobenzene and Benzene

Solubilities of a number of gases in hexafluorobenzene (F-solvent) and benzene (H-solvent), as well as the thermodynamic functions characterizing the solution process were calculated via the scaled particle theory (SPT). The results were compared to the experimental results reported earlier. The discussion was extended to include other pairs of F-solvents and H-solvents. SPT was also used to determine the Lennard-Jones (6–12) potential parameters of four solvents, namely, C6F6, n-C7F16, C6F11CF3, and C6H11CH3

Binary Gaseous Diffusion Coefficients 1. Methane and Carbon Tetrafluroide with \u3cem\u3en\u3c/em\u3e-Hexane, \u3cem\u3en\u3c/em\u3e-Heptane, \u3cem\u3en\u3c/em\u3e-Octane, and 2,2,4-Trimethylpentane at One-Atmosphere Pressure at 10-70 Degrees Celsius

The binary gaseous diffusion coefficients of methane and carbon tetrafluoride with n-hexane, n-heptane, n-octane, and 2,2,4 trimethylpentane were measured at one atmosphere pressure and loo, 25°, 40°, 55°, and 7O°C by the capillary tube method of Stefan. The predicted diffusion coefficients calculated using Lennard-Jones potential parameters in the Chapman-Enskog approximate kinetic theory were about 2-6% low for the systems with methane and about 10-13% low for the systems with carbon tetrafluoride

Estimation of Lennard‐Jones (6,12) Pair Potential Parameters from Gas Solubility Data

The Lennard‐Jones (6,12) pair potential parameters for solvents can be calculated from gas solubility data by using the scaled particle theory to calculate the work of cavity formation. Values of the hard sphere diameter σ1 and the energy parameter ε1/k at 298.15°K and 1 atm pressure are reported for 39 liquids, polar as well as nonpolar. These parameters are discussed in relation to values determined by other methods

The Solubility of Gases in Liquids I. The Solubility of a Series of Fluorine-Containing Gases in Several Non-Polar Solvents

The solubilities of CF3Cl and CF2Cl2 in n-heptane, n-octane, cyclohexane, benzene, and carbon tetrachloride, and additionally CF4 and SF6 in n-octane were determined in the temperature range 24 to 35 °C. The solubility, Gibbs free energy, enthalpy, and entropy of solution were calculated from the experimental results for 1 atm partial pressure of gas and 25 °C. These values were compared with results calculated using the scaled particle theory. The agreement was good. The scaled particle theory was also used to determine the Lennard-Jones (6–12) pair potential parameters for the solvents, yielding results which are in excellent agreement with literature values

Binary Gaseous Diffusion Coefficients IV. Sulfurhexafluoride with \u3cem\u3en\u3c/em\u3e-Hexane, \u3cem\u3en\u3c/em\u3e-Heptane, \u3cem\u3en\u3c/em\u3e-Octane, and 2,2,4-Trimethylpentane at 1 Atm at 10-70 Degrees Celsius

Binary gaseous diffusion coefficients at 1-atm pressure of sulfur hexafluoride, with n-hexane, n-heptane, n-octane, and 2,2,4-trimethylpentane (isooctane) were measured at 10°, 25°, 40°, 55°, and 70°C by the capillary tube method of Stefan. Diffusion coefficients were calculated (a) by using Lennard-Jones (6, 12) pair potential parameters In conjunction with the Hudson-McCoubrey comblnlng rule and (b) with a semlemplrlcal method somewhat similar to that suggested by Chen and Othmer. Diffusion Coefficients calculated via method (b) were In much better agreement with experiment than those obtained via method (a). The experimental results were used to investigate certain regularities in diffusional behavior of homologous species in mixtures with a common gas. In particular, a strikingly simple correlation (first advanced by Wakeham and Slater) was tested and found applicable, even when the common gaseous component is a pseudospherical molecule of considerable size and mass, such as SF6. Provided that experimental data on two sufficiently spaced homologs are available, the correlation apparently offers a powerful predictive potential