The determination of all syzygies for the dependent polynomial invariants of the Riemann Tensor. II. mixed invariants of Eeven degree in the Ricci Spinor

We continue our analysis of the polynomial invariants of the Riemann tensor in a four-dimensional Lorentzian space. We concentrate on the mixed invariants of even degree in the Ricci spinor Φ_ABȦḂ and show how, using constructive graph-theoretic methods, arbitrary scalar contractions between copies of the Weyl spinor ψ_ABCD, its conjugate ψ_ȦḂĊḊ and an even number of Ricci spinors can be expressed in terms of paired contractions between these spinors. This leads to an algorithm for the explicit expression of dependent invariants as polynomials of members of the complete set. Finally, we rigorously prove that the complete set as given by Sneddon [J. Math. Phys. 39, 1659-1679 (1998)] for this case is both complete and minimal.

Mode II delamination toughness of Z-pinned laminates

Mode II delamination toughness of z-pin reinforced composite laminates is investigated using finite element (FE) method. The z-pin pullout process is simulated by the deformation and breakage of non-linear springs. A critical shear stress criterion based on linear elastic fracture mechanics is used to simulate crack growth in an end-notched-flexure (ENF) beam made of z-pinned laminates. The mode II toughness is quantified by the potential energy release rate calculated using the contour integral method. This FE model is verified for an unpinned ENF composite beam. Numerical results obtained indicate that z-pins can significantly increase the mode II delamination toughness of composite laminate. The effects of design variables on the toughness enhancement of z-pinned laminates are also studied, which provides an important technological base and useful data to optimize and improve the z-pinning technique.

Cross-sector organisational engagement with ethics : a comparison between private sector companies and public sector entities of Sweden

Purpose – The purpose of the paper is to describe and compare similarities as well as differences in the organizational engagement with ethics between private sector companies and public sector entities.

Design/methodology/approach – A survey was conducted in order to examine the organizational engagement with ethics in the largest private sector companies and the largest public sector entities in Sweden. Two adapted questionnaires were developed for each sector. The outcome of this research procedure is reported in this paper.

Findings – There are both minor and major differences between the private sector and public sectors, where the private sector companies overall tend to be more engaged with ethics than the public sector entities in areas such as: ethical bodies, ethical tools, internal and external ethical usage, and ethical support measures and ethical performance measures.

Research limitations/implications – This paper makes a contribution to theory as it outlines findings for the benefit of other researchers working in private and/or public sectors in the field. A suggestion for further research is to examine the organizational engagement with ethics in other countries/cultures that differ from the ones in this research effort performed in the private and public sectors of Sweden.

Practical implications – The research may be of managerial interest as it provides a grounded framework of areas to be considered in the examination of organizational engagement with ethics in both private sector companies and public sector entities. It may be used as a benchmark by either sector.

Originality/value – It reports a research effort to develop and describe a cross-sector comparison of the organizational engagement with ethics between private sector companies and public sector entities of Sweden. A framework is also introduced and illustrated. It also makes a contribution to theory and practice in the field as it is based upon a dual sample that provides insight into cross-sector organizational engagement with ethics.

Implementation, communication and benefits of public sector codes of ethics : a longitudinal study of Sweden

Purpose – The purpose of this paper is to examine the implementation, communication and benefits of codes of ethics in the public sector of Sweden.

Design/methodology/approach – The research is based on a longitudinal approach. It examines the ethos of codes of ethics in the largest public sector organizations of Sweden in 2001-2002 and 2005-2006.

Findings – Only a few of the largest public sector organizations in Sweden have indicated that they possess codes of ethics. This finding may be explained by the current judicial legislation that governs Swedish society. The public codes of ethics have been established both recently and, in part, years ago.

Research limitations/implications – A suggestion for further research would be to examine the implementation, communication and perceived benefits of public sector codes of ethics in other countries. Another area of further research would be to replicate the reported surveys in the future to examine the existence of potential trends.

Practical implications – When it comes to the perceived benefits of public sector codes of ethics there appears to be only minor acknowledgement of the code being used to resolve ethical problems in society. However, there is a strong conviction that the code of ethics positively influences the operations of public sector organizations.

Originality/value – The paper examines the ethical implementation, communication and benefits put in place by private companies to embed codes of ethics into their organizations.

π-Selective stationary phases: (II) Adsorption behaviour of substituted aromatic compounds on n-alkyl-phenyl stationary phases

The frontal analysis method was used to measure the adsorption isotherms of phenol, 4-chlorophenol, p-cresol, 4-methoxyphenol and caffeine on a series of columns packed with home-made alkyl-phenyl bonded silica particles. These ligands consist of a phenyl ring tethered to the silica support via a carbon chain of length ranging from 0 to 4 atoms. The adsorption isotherm models that fit best to the data account for solute–solute interactions that are likely caused by π–π interactions occurring between aromatic compounds and the phenyl group of the ligand. These interactions are the dominant factor responsible for the separation of low molecular weight aromatic compounds on these phenyl-type stationary phases. The saturation capacities depend on whether the spacer of the ligands have an even or an odd number of carbon atoms, with the even alkyl chain lengths having a greater saturation capacity than the odd alkyl chain lengths. The trends in the adsorption equilibrium constant are also significantly different for the even and the odd chain length ligands.

Northern Lights: the positive policy example of Sweden, Finland, Denmark and Norway

The nations of Scandinavia and Finland, or Nordic Europe, continue to provide living proof that economic prosperity can be combined with social equality and environmental responsibility. This book, written from an Australian perspective, explores previous outside policy interest in the Nordic nations and outlines some lessons which the English-speaking world, in particular, can learn now from the achievements of the four main Nordic European nations. In terms of income distribution these countries are still much more equal than Australia, Britain, New Zealand and Canada – and nearly twice as equal as the United States. Workforce participation rates are high in the Nordic nations but working hours remain within reasonable limits, enabling genuine work–life balance. Sweden has played a leading role in improving wellbeing, and lowering poverty, among children. Finland has achieved stunning success in schools since the 1990s. Denmark invests in comprehensive skills training as part of providing security, as well as flexibility, in people’s employment lives. Norway’s taxation approach and other measures ensure that its natural resources are used sustainably for the entire nation’s long-term wealth. All of these achievements are relevant to the policy choices for the future which Australia, and other English-speaking countries, can now make.

The influence of rare earth mercaptoacetate on the initiation of corrosion on AA2024-T3 Part II: The influence of intermetallic compositions within heavily attacked sites

Localised corrosion is typical on AA2024-T3 due to intermetallic particles embedded in the alloy. The effect of intermetallic compositions on corrosion are not yet fully understood. EPMA data on AA2024-T3 surfaces before and after a 16. min immersion, analyses the influence of intermetallic clustering on the severity attack at local sites. While sites with a high number of domains and a large S-phase surface area typically lead to severe attack, maximising these features did not always lead to severe corrosion attack. Cerium or praseodymium mercaptoacetate inhibited corrosion ring formation. The common trends observed from such attack sites was also discussed.

Determination of sodium oxalate in Bayer liquor using flow-analysis incorporating an anion exchange column and tris(2,2`-bipyridyl)ruthenium(II) chemiluminescence detection

Semi-automated flow injection instrumentation, incorporating a small anion exchange column coupled with tris(2,2′-bipyridyl)ruthenium(II) (Ru(bipy)₃²⁺) chemiluminescence detection, was configured and utilised to develop rapid methodology for the determination of sodium oxalate in Bayer liquors. The elimination of both negative and positive interferences from aluminium(III) and, as yet, unknown concomitant organic species, respectively are discussed. The robustness of the methodology was considerably enhanced by using the temporally stable form of the chemiluminescence reagent, tris(2,2′-bipyridyl)ruthenium(III) perchlorate in dry acetonitrile. Real Bayer process samples were analysed and the results obtained compared well with those performed using standard methods within industrial laboratories.