A wire corrosion test (WCT) is used to investigate the influence of model organosulfur extreme pressure additives and analogues. The response from these compounds discussed with regards chemical structural type. Corrosion rates were calculated using guide in ASTM G31 provide a measurement mm/year.

Developing high yielding and stable genotypes for wide and specific adaptation is important in wheat (Triticum aestivum L.) production. The objective of this study was to exploit the gains from genotype by environment interaction for increased bread wheat production in eastern Africa. Thirty-three advanced bread wheat lines, along with two check varieties (Danda’a and Hidasse) were evaluated at...

Among the promising bulk chemicals, 1,3-propanediol (1,3-PD) and 2,3-butanediol (2,3-BD) are two bio-based diols, which have a wide range of applications in cosmetic and food industry, as antifreezes, lubricants, fuel additives, as well as in the production of polymers. The possibility to obtain diols from the waste glycerol is topical by two reasons. First, the waste glycerol is received in la...

Given the objective of maximizing the wealth of existing shareholders, this paper discusses some of the issues that arise in attempting to measure the performance of individual businesses within a bank. The paper describes two return measures – return on assets within a business and the return on the ‘equity’ of an individual business – and discusses the appropriate bench-marks. The paper ends ...

SS Bollapragada,a JD Norrie,b JE Normana a Division of Developmental Medicine, Maternal and Reproductive Medicine, University of Glasgow, Glasgow Royal Infirmary, Glasgow, UK bCentre for Healthcare Randomised Trials (CHaRT), Health Services Research Unit, Aberdeen University, Aberdeen, UK Correspondence: Dr SS Bollapragada, Division of Developmental Medicine, Maternal and Reproductive Medicine,...

We consider mathematical models for portfolio credit risk. We analyze the mathematical structure and in particular the modelling of dependence between default events in these models and propose extensions of standard industry models. We study the model risk related to the choice of model structure and input parameters. Finally we develop and test several approaches to model calibration in credi...

The objective of this study is to provide an alternative characterization of the optimal value function of a certain BlackScholes-type optimal stopping problem where the underlying stochastic process is a general random walk, i.e. the process constituted by partial sums of an IID sequence of random variables. Furthermore, the pasting principle of this optimal stopping problem is studied. JEL Cl...

Eukaryotic initiator tRNA (tRNAi) contains several highly conserved unique sequence features, but their importance in accurate start codon selection was unknown. Here we show that conserved bases throughout tRNAi, from the anticodon stem to acceptor stem, play key roles in ensuring the fidelity of start codon recognition in yeast cells. Substituting the conserved G31:C39 base pair in the antico...

We study the life cycle of a firm that produces good unknown quality. The manages its quality by investing while consumers learn via public breakthroughs; if fails to generate such breakthroughs, revenue falls and it eventually exits. Optimal investment depends on firm’s reputation (the market’s belief about quality) self-esteem own quality), is single-peaked in time since breakthrough. derive ...

Business credit lags GDP growth by about one year. This contributes to high leverage during recessions and slow deleveraging. We show that a model in which firms use risky long-term debt replicates this adjustment of firm debt. In the model, slow-moving has important effects for real activity. High levels issued expansions are only gradually reduced recessions. generates an adverse feedback loo...