Helium additions to MIG shielding gas - an economic option?

An investigation has been carried out to establish the technical and economic benefits of adding two levels of helium to a normal shielding gas. Technically no adverse issues were established using the two levels of helium, and the most significant positive one was the highly beneficial effects on travel speed increase and heat input decrease. Although helium gas carries a significant cost premium, the economic evaluation showed that overall this was a beneficial approach as the man-hour reduction associated with the welding process dominated the process cost effects

Antiphase Stripe Order as the Origin of Electron Pockets Observed in 1/8-Hole-Doped Cuprates

Recent quantum oscillation measurements on underdoped cuprates are shown to be consistent with the predictions of a mean field theory of the 1/8 magnetic antiphase stripe order proposed to occur in high-$T_c$ cuprates. In particular, for intermediate values of the stripe order parameter, the magneto-transport is found to be dominated by an electron pocket

Evaluation of gas metal arc welding with alterating shielding gases for use on AA6082T6

Studies have been carried out to determine the effects of implementing alternating shielding gases for 6082T6 aluminium alloy welding. Alternating shielding gases is a newly developed method of supplying shielding gases to the weld area to enhance the efficiency of the standard Gas Metal Arc Welding (GMAW) process. This method involves discretely supplying two different shielding gases to the weld zone at a pre-determined frequency which creates a dynamic action in the weld pool. Several benefits have been identified in relation to supplying shielding gases in this manner including increased travel speed, reduced distortion, reduced porosity and, in the case of specific alternating frequencies, marginal improvements in mechanical properties. All in all, this method of shielding gas delivery presents attractive benefits to the manufacturing community, namely the increased productivity and quality in addition to a reduction in the amount of post-weld straightening required. However, the literature available on this advanced joining process is very scant, especially so for aluminium alloys. For this reason, an evaluation has been carried out on the application of alternating shielding gases for the GMAW process on 6082T6 aluminium alloys

A Bacterial Cellulose - Nanosilver System

Both nanocrystalline silver and bacterial cellulose have been used as biomedical materials. Silver has been used as an antimicrobial agent, and bacterial cellulose as a wound dressing. The combination of both these technologies has the potential to create a synergistic scenario. A novel method for the attachment of nanocrystalline silver to bacterial cellulose has been developed. The cellulose is oxidized with sodium metaperiodate to dialdehyde cellulose and functionalized with silver using thiosemicarbazide, silver protienate and ammoniacal silver. The samples were prepared using both a commercially available bacteria cellulose wound dressing, Biofill, and lab made, wet pellicle, as the substrate. The antimicrobial efficacy against E. coli and S. aureus has been determined using a modified disk diffusion test procedure, and the release profiles of silver into deionized water were determined. These tests have shown an antimicrobial efficacy ranging between 1 day for the Biofill prepared samples and 5 days for the pellicle based samples

A statistical analysis of variations in intraregional wage levels in New England

This item was digitized by the Internet Archive

The effect of carbohydrate-loading and carbohydrate ingestion on fuel substrate kinetics during prolonged cycling

It has been well established that both carbohydrate-loading before and carbohydrate ingestion during exercise can enhance endurance performance by supplying carbohydrate for oxidation. However, the precise mechanism(s) underlying the proposed ergogenic effects of these procedures remain to be established. The studies in this thesis were therefore designed to examine the effects of carbohydrate-loading and carbohydrate ingestion on fuel substrate kinetics

Measurement of the branching fraction for neutral kaon(long) decaying to muon-electron-positron

This dissertation describes the measurement of the decay of the long lived neutral kaon into two muons and two electrons. The measurement was performed using the data taken during experiment E871 which was performed on the B5 beamline at the Alternating Gradient Synchrotron (AGS) of the Brookhaven National Laboratory (BNL). The branching ratio B( K0L → mu+mu-e +e-) is sensitive to the absorptive portion of the long distance amplitude for decays of the form K0L → ℓ+ℓ- and can be used to properly extract the short distance weak interaction amplitudes from the dileptonic events.;Measurement of K0L → mu+mu-e +e- additionally allows for the exploration of the form factor for the K0L → gamma*gamma* vertex. Measurement of the K0L → mu+mu-e +e- branching fraction from the E871 data set provides a sensitive probe to distinguish between form factors arising from a chiral theory near the kaon mass, a low energy quark/QCD theory, a vector meson dominance model, models with CP violation and models which exhibit a uniform phase space.;The analysis of the data from the E871 mumu data stream observed 119 K0L → mu+mu-e +e- events on a measured background of 52 events. The K0L → mu+mu-e +e- event sample was normalized using simultaneously measured sample of 5685 K0L → mu+mu- events. The resulting branching fraction for K0L → mu+mu-e +e- was calculated to be 2.78 +/- 0.41 +/- 0.09 x 10-9 under the assumption of a chiPT form factor. The results are consistent with the world average for B( K0L → mu+mu-e +e-) and increase the total number of K0L → mu+mu-e +e- events observed world wide from 152 to 271

Therapist Paraphrases and Common Factors: Evidence for Causality

Therapist paraphrases are integral to clinical interviewing and are believed to promote common-factor variables like empathy and congruence. However, few studies have used an experimental design to examine therapist paraphrases independent of other treatment components. The purpose of this study was to study the degree to which therapist paraphrases influence outcome expectancy, treatment credibility, empathy, congruence, and the working alliance compared to another verbal response type: the minimal encourager. Participants were assigned to hear two therapy interactions in a random order. These interactions contained different levels of therapist paraphrases and minimal encouragers. Multivariate analyses revealed that paraphrases generally resulted in more favorable perceptions of therapy interactions. Follow-up analyses revealed that paraphrases generally produced higher scores across all variables, but the difference was statistically significant only for empathy and congruence. These results provide evidence that paraphrases make therapists appear more empathetic and congruence, at least compared to using minimal encouragers alone