This study examines the fatigue and anisotropy behaviour of cold rolled AA1200 aluminium alloy for light weight automotive connecting rod application. Aluminium (Al) 1200 ingots were melted at temperature of 680 0C (after one hour of heating) cast in sand mould and cast samples homogenized for 6 hrs at 480 0C. The cold rolling process was carried out after homogenisation for 10, 20, 30, 40 and ...

Mesophilic bacteria, fungi and actinomycetes varied during composting cycles with high numbers in the initial and final cycles with maximal values in compost C and D, and sharply decreased in the heating cycles. Staphylococcus aureus and Bacillus subtilis were dominated at the initial composting cycle. Whereas, at maturity Bacillus subtilis was the major followed by B.badi...

Throughout the 1980s and into the early 1990s, the effects of several financial cycles severely battered the banking system of the United States. As used here, the term "cycle" does not imply a recurring phenomenon, but rather a cycle through various phases--as in a boom and bust cycle. Most of these cycles began with a prolonged period of extraordinary growth centered in a particularly risky t...

Syphilis has re-emerged as a global public health issue. In lesser developed countries, millions of people are contracting the disease, which can be fatal without access to proper treatment. In developed countries, prevalence is on the rise and has cycled around endemic levels for decades. We investigate syphilis dynamics by extending the classic SIRS epidemiological model to incorporate forwar...

We propose a model of history dependent disappointment aversion (HDDA), allowing the attitude of a decision-maker (DM) towards disappointment at each stage of a T -stage lottery to evolve as a function of his history of disappointments and elations in prior stages. We establish an equivalence between the existence of an HDDA representation and two documented cognitive biases. First, the DM over...

We prove regularity bounds for Koszul cycles holding for every ideal of dimension ≤ 1 in a polynomial ring; see Theorem 3.5. In Theorem 4.7 we generalize the “c + 1” lower bound for the Green–Lazarsfeld index of Veronese rings proved in (Bruns et al., arXiv:0902.2431) to the multihomogeneous setting. For the Koszul complex of the c-th power of the maximal ideal in a Koszul ring we prove that th...

This paper studies the dynamics of fundamental research. We develop a simple model where researchers allocate their effort between improving existing fields and inventing new ones. A key assumption is that scientists derive utility from recognition from other scientists. We show that the economy can be either in a regime where new fields are constantly invented, and then converges to a steady s...

We embed frictions in the sale of ideas in a relatively standard real business cycle model. Inventors own ideas that they can either inefficiently implement on their own, or implement them efficiently in partnership with firms. However, firms can steal ideas; they are likely to do so if the idea is of sufficiently high quality. Introducing this agency problem in a dynamic general equilibrium mo...

Using a recently developed worker-occupation mismatch measure for the US labor market, we document that mismatch is pro-cyclical. However, there is substantial heterogeneity by previous employment status: mismatch is pro-cyclical for workers in ongoing job relationships and job-tojob transitions, consistent with the cleansing effect of recessions; while mismatch is counter-cyclical for new hire...