Thisstudy was focused on the investigation of the effect of cold rolling reduction mechanism at rates of 24%, 40%, 56% and 72% on the structure, microhardness (Hv), TEC (Thermal expansion coefficient) and electrical ...
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This study was focused on the investigation of the effect of cold rolling reduction mechanism at rates of 24%, 40%, 56% and 72% on the structure, microhardness (Hv), TEC (Thermal expansion coefficient) and electrical resistivity of the Al-20wt.%sn-1wt.%Cu bearing alloy. The results showed that the structure and properties of the Al-sn-Cu alloy have been strongly affected by the cold rolling mechanism. The crystallite size of Al-matrix decreased continuously with increasing cold rolling reduction till 56% then slightly increased at 72% reduction. microhardness of the alloy increased continually with cold rolling deformation till 56% due to strain hardening followed by a reduction at 72% due to the natural softening. The TEC curves of the cold rolled samples showed the lowest TEC obtained for 56% cold rolling reduction at 230 oC. Electrical resistivity increased continuously with increasing cold rolling reduction.
AIm: To elucidate the relationship between clinical presentation and outcome. mETHODs: A single institution retrospective chart review of patients admitted with the diagnosis of colon cancer. We used univariate and a ...
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AIm: To elucidate the relationship between clinical presentation and outcome. mETHODs: A single institution retrospective chart review of patients admitted with the diagnosis of colon cancer. We used univariate and a multivariate analysis to identify symptoms association with mortality. An odds ratio based clinical score was created to evaluate the contribution of the quality of symptoms to outcome. Primary measure of outcome was survival. REsULTs: During the study period, 236 patients met the inclusion criteria. Overall survival was 60.6%, mean follow-up 3.0 years. A bivariate analysis showed that increasing number of symptoms is not associated with mortality. However, a symptom-specific analysis performed using a logistic regression model controlling for age, stage and the duration of complaints revealed that the presence of melena was independently associated with mortality [P = 0.04, odds ratio (OR) 7.4],while rectal bleeding was associated with survival (P = 0.004, OR 3.9). Applying the proposed clinical score to an receiver operating characteristic curve showed that score > 1 had a strong association with mortality. The same logistic regression model was applied. The results showed that a score > 1 was an independent predictor of mortality (P ssociated with node-positive disease (P = 0.008). CONCLUsION: The quality of symptoms rather than quantity is correlated with outcome among patients with colon cancer. The proposed clinical scoring system may correctly predict the patient's outcome.
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