Antiwear and Extreme Pressure Properties of Nanofluids for Industrial Applications

This study investigates the effect of CuO, TiO₂, Al₂O₃, and multiwalled nanotube (MWNT) nanoparticles at various treat rates on the tribological properties, namely, wear, coefficient of friction (COF), and pressure of seizure (p_oz), of metalworking fluids during lubricating processes in diverse industrial applications. Results are reported based on two methods: wear scar diameter (WSD) and COF by ASTM D5183 and p_oz by the Institute for Sustainable Technologies–National Research Institute (ITEePib) Polish method for testing lubricants under scuffing conditions. Results showed significant improvements with small filler concentrations of nanoparticles. CuO nanofluids showed a diminishment of 86% for WSD at 0.01 wt%, whereas TiO₂ resulted in an increase in p_oz of up to ～250% at 0.05 wt% compared to pure conventional fluid.     

Phenolics and related substances in alcohol-free beers

 The present study examines and compares the phenolic compositions of several commercially available alcohol-free and standard beers. In general, the values for the contents of the phenolic components in the alcohol-free beers are lower than the values for the standard beers; this is attributable to differences in the duration of fermentation and the yeast strains employed in brewing alcohol-free beers (e.g., the case of tyrosol) and to losses brought about by the dealcoholization processes employed (e.g., p-coumaric acid, caffeic acid, vanillic acid, etc.). The values for the other low-molecular-weight compounds considered, such as 5-(hydroxymethyl)furfural and tryptophol, are also lower in the alcohol-free than in the standard beers. Received: 16 July 1999     

Multivariate data analysis in classification of must and wine from chemical measurements

A chemometric study was carried out; based on measurements of chemicals present in musts and wines from the Tacoronte-Acentejo Designation of Origin area (Canary Islands, Spain) obtained in an artisanal winemaking procedure. Univariate and multivariate data analysis was used to distinguish between two different harvest years (1987 and 1988) in both musts and wines. The data was examined using the statistical techniques of discriminant analysis, principal component analysis, biplot analysis and factor analysis, which allowed the study of the underlying structures of the data and the characterization of the wines. This methodology was able to differentiate between musts and wines according to traditional variables used in wine analysis. However, no clear differentiation was found with respect to the year of vintage.     

Implications of test revisions for research.

Test revisions are increasingly common in psychology and neuropsychology in particular. However, such revisions may alter in complex ways the kind of information obtained, and they may assess traits, abilities, and conditions in ways different from earlier versions. This article outlines some of the problems associated with the revision of tests facing clinicians and researchers. Three broad classes of revision are considered. Part I considers the aging of tests, part 2 concerns the aging of participants, and part 3 considers changes in test format. Although the article focuses largely on measures of intelligence and personality, the issues addressed in the article apply to other tests and assessment domains as well. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effective Partnering in Innovative Procured Multicultural Project

Effective partnering has been shown to improve projects in numerous ways including cost, schedule, safety, quality, and claims. However, partnering in a multicultural, multiphase environment has some additional challenges. This paper describes some lessons learned from the Tren Urbano project in San Juan, Puerto Rico, a $1.5 billion, 17.2-km heavy-rail project. The Tren Urbano Project has an innovative procurement strategy of turnkey with multiple primes, which combined with the multiphase, multicultural project environment presents additional challenges for providing an effective partnering environment. A system dynamics partnering model was built to demonstrate that the partnering effort in the Tren Urbano project was adequate for a traditional procured, limited culture project. However, for a project like Tren Urbano, a greater partnering effort is needed to achieve the same results.     

Help seeking for mental health care among poor Puerto Ricans: problem recognition, service use, and type of provider

OBJECTIVES: This study examines the effects of health, predisposing, and enabling factors on recognition of a mental health problem, use of formal mental health care, and contact with a specialized mental health provider. METHODS: Interviews were conducted with a probability sample of 3,435 adults. The variables examined include measures of mental health; social and demographic factors; and enabling factors relevant to the help-seeking process. RESULTS: Subjective and objective measures of mental health were associated with the recognition of a mental health problem. The objective assessment of definite need for services was relevant for the use of formal services. However, the subjects' perception of poor mental health was strongly related to receiving care from a mental health specialist. Although interaction with social networks is associated with use of formal services, low economic strain is related to receiving care from the specialty sector. CONCLUSIONS: The results support the importance of using multiple measures of mental health problems. The finding that individuals' perceived economic strain increases the likelihood of receiving specialized care suggests that studies of economic barriers to the use of mental health services might benefit from the adoption of measures that assess perceived economic circumstances.