He\u27s A Dirty Bird

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Characterisation of the cold metal transfer (CMT) process and its application for low dilution cladding

The process characteristics of the synergic cold metal transfer (CMT) process have been examined for welding aluminium alloy. Utilising a simple backlighting system and through the arc monitoring the droplet transfer modes were identified. Whilst the modified short circuit mode was evident for the lower parameter range, a two part transfer mode based upon a combination of spray and short circuit transfer was observed for the mid to upper parameter range. The technology was also explored as a cladding process for applying to ternary alloyed (Al–Cu–Mg) aluminium plate. This alloy system is known to be susceptible to solidification cracking when MIG welded using the binary Al-2319 (Al–Cu) filler wire, this being due to the wide element freezing range of the weld resulting from mixing with the base material. Utilising this filler, weld dilution ratios for both CMT and pulsed welding were identified across the examined parameter range. The CMT process exhibited greater control of dilution that enabled deposition of a quasi-binary (Al–Cu) layer exhibiting a less crack susceptible composition. Onto this layer conventional MIG welding could be applied which could potentially eradicate cracking using a binary fi

Putrid Desire

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Dilettante, Venturesome, Tory and Crafts: Drivers of Performance Among Taxonomic Groups

Empirical research has failed to cumulate into a coherent taxonomy of small firms. This may be because the method adapted from biology by Bill McKelvey has almost never been adopted. His approach calls for extensive variables and a focused sample of organizations, contrary to most empirical studies, which are specialized. Comparing general and special purpose approaches, we find some of the latter have more explanatory power than others and that general purpose taxonomies have the greatest explanatory power. Examining performance, we find the types do not display significantly different levels of performance but they display highly varied drivers of performance

IU-IBM Protein Family Annotator Project Final Report

In June 2002, IU and IBM signed a joint study agreement (W0125820) to develop protein family annotator software as part of a larger IU-IBM life sciences partnership. IBM provided $35,000 for the project. Matching funds were provided by IU's Indiana Genomics (INGEN) project and School of Informatics to procure hardware (two IBM Intel servers) and to be applied toward a programmer's salary. This document serves as the final report on the joint study agreement.IBM, Inc

A Perspective on Hadron Physics

The phenomena of confinement and dynamical chiral symmetry breaking are basic to understanding hadron observables. They can be explored using Dyson-Schwinger equations. The existence of a systematic, nonperturbative and symmetry preserving truncation of these equations enables the proof of exact results in QCD, and their illustration using simple but accurate models. We provide a sketch of the material qualitative and quantitative success that has been achieved in the study of pseudoscalar and vector mesons. Efforts are now turning to the study of baryons, which we exemplify via a calculation of nucleon weak and pionic form factors.Comment: 16 pages, 5 figures. Contribution to the proceedings of the "Xth Mexican Workshop on Particles and Fields," Morelia, Mexico, 6-12 Nov. 200

Brief Note: Diet of the Rainbow Darter (Etheostoma caeruleum) in Rock Run, Clark County, Ohio

Author Institution: Department of Biology, Wittenberg UniversityThe diet of the rainbow darter, Etheostoma caeruleum, was studied during fall and winter in Rock Run (Clark County, Ohio), a second-order tributary of the Mad River. Chironomid larvae comprised over half of the diet (by numerical percentage) during both seasons. Other important components of the diet were simuliid larvae, trichopteran larvae (Cheumatopsyche and Hydropsyche) and coleopteran larvae (Stenelmis). Both chironomid and simuliid larvae appeared in the diet of E. caeruleum in greater abundance than they appeared in the available benthic macroinvertebrate populations. Stenelmis larvae comprised a smaller portion of the diet than of the benthic macroinvertebrate population. Etheostoma caeruleum typically feeds heavily on dipteran, trichopteran, and ephemeropteran larvae, but other locally abundant prey may also be an important part of the diet. It appears that dietary selectivity of E. caeruleum may be greater during the winter than during the fall