Aluminum trihalide interactions with polyolefin tricarbonyliron compounds

IR studies show that in solution aluminum trihalides form Lewis acid adducts at the iron atom in polyolefin tricarbonyliron complexes. A ketonic organometallic compound also forms a 2/1 adduct.     

Experimentally determined oscillator strengths and linewidths for the Schumann-Runge band system of molecular oxygen—II. The (2-0) to (5-0) bands

Experimental oscillator strengths and predissociation linewidths have been measured at room temperature for the (2-0) to (5-0) Schumann-Runge bands of molecular oxygen using the Adelaide 6 m vacuum ultraviolet monochromator operated at a resolution of about 0.06 Å. Photoelectric detectors were used to measure the ultraviolet absorption at normally two different gas pressures for 37 groups of rotational lines, and the resulting data were interpreted using an equivalent width type of analysis. The variation with N″ of the oscillator strengths within each band was found to be smaller than that measured earlier for the higher vibrational bands. Measured oscillator strengths agree well with previously accepted values except for the (3-0) band, while the linewidths of the present work agree well with recent theoretical values for the (3-0) and (4-0) bands but are larger for the (2-0) and (5-0) bands. A modification was performed on the parameters of a recent theoretical predissociation model to produce excellent overall agreement between experimental and theoretical linewidths from ν' = 2 to 14. The present work provides results which can be used to construct accurate synthetic absorption profiles for studies of the atmospheric absorption of ultraviolet radiation by the Schumann-Runge bands.     

The numerical simulation of multiphase flow through a porous medium and its application to reservoir engineering

The analysis of multiphase flow in porous media is of considerable significance in the field of petroleum reservoir simulation, where accurate predictions of fluid flow are important in assessing the performance of oil and gas fields. The specific case of two-phase immiscible flow is considered by first deriving the governing nonlinear partial differential equations. The space discretization is then carried out making use of the additional versatility of the finite element method compared with originally used finite differences. By using a pair of dependent variables P and R, the bandwidth of the discrete space-continuous time equations may be reduced to increase significantly the speed of the algorithm. A discussion of time-stepping methods is followed by an application of the technique to a five-spot,an extraction pattern used in the field. The boundary conditions used to simulate this flow pattern are also discussed.     

An Example of the Application of a Systematic Method to Design

This paper is concerned with using the digital computer as an aid to the solution of a class of multivariable design problems and reports some experience. The input to the computer is a set of design variables and a set of interactions between these variables, while the output consists of a hierarchy of groups of highly interacting variables. Both the preparation of the input and the interpretation of the output depend on subjective decisions by the designer using the computer. A specific application was therefore investigated in which different sets of inputs were compiled by three different designers, using 18, 38, 58 and 185 variables. The four outputs were analysed to compare their usefulness as a design aid in proportion to the effort required for their preparation. An IBM 7044 computer was used and a guide is given for the estimation of program running times on this machine.     

The use of porous glass beads in the separation and purification of ruthenium complexes with large organic ligands

For complexes of highly-charged transition metal cations with large organic ligands, the use of glass beads as a chromatographic support allows the ready isolation of analytically pure samples of species which tend to decompose readily on more traditional supports. The method has been used in the purification of binuclear ruthenium complexes which are usually contaminated with a small amount of the monomer, and in the purification of ferrocene-ruthenium complexes which are difficult to separate from polymeric ferrocene residues.     

IFECS—an interactive finite element computing system

The development philosophy and implementation of IFECS (an interactive finite element computing system) is described. The system, written in BASIC-PLUS for the RSTS/E computing system, provides solutions for various classes of stress problems in two dimensions. IFECS contains an automatic mesh generator, solution routines and an interactive means of interrogating the program output. This latter feature provides the user with the means of directly selecting relevant information, rather than having to wade through vast reams of the total output. The system, which may be implemented on a very simple computing configuration, is very easy to use and for many problems reduces the effective solution time to a few hours.