Airborne particles that are collected using closed-face filter cassettes (CFCs), which are used widely in the sampling of workplace aerosols, can deposit in places other than on the filter and thereby may not be included in the ensuing analysis. A technique for ensuring that internal non-filter deposits are included in the analysis is to collect airborne particles within an acid-soluble interna...

Confusion in the literature about the definition and calculation of repetitive member factors is identified. This confusion casts some doubt on the validity of the 1.15 repetitive member factor permitted in ASTM standards D245 and D1990. DOI: 10.1061/(ASCE)ST .1943-541X.0000413. © 2012 American Society of Civil Engineers. CE Database subject headings: Wood; Material properties; Reliability. Aut...

En este trabajo se presenta un plan de mantenimiento automotriz basado en diagnóstico tribológico del aceite lubricante origen mineral grado SAE 20W50 multigrado, utilizado la lubricación motor combustión interna cuatro cilindros, 1800 cm3, posición diagonal, enfriado por anticongelante, con sistema bomba mecánica. Las muestras obtuvieron bajo diferentes condiciones uso: 0km, 1000km, 5000km y 8...

The electron beam melting (EBM) is a useful technique for fabricating alloys that are difficult to machine and require expensive tools as well as the presence of inert atmosphere for further treatments. Under vacuum, EBM provides a controlled environment, reducing the drawbacks of the alloys of their processing in a conventional manner and thereby improving their microstructure, which can enhan...

During their aquatic life cycle, nanoparticles are subject to environmentally driven surface modifications (e.g. agglomeration or coating) associated with aging. Although the ecotoxicological potential of nanoparticles might be affected by these processes, only limited information about the potential impact of aging is available. In this context, the present study investigated acute (96 h) and ...

Introduction: Ultra-high molecular weight polyethylene oxidation remains an important concern in total joint arthroplasty, since it eventually results in a significant drop in mechanical properties that may compromise implant longevity, especially for TKA [1-3]. In vivo oxidation of polyethylene can occur in the presence of unstabilized macroradicals within the polymer and molecular oxygen upta...