State boards responsible for higher education, 1970,

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High-pressure viscosity measurement of fatty acids and oils

The viscosities of olive oil and its constituent fatty acids were measured using a falling sinker-type high-pressure viscometer. The viscometer consists of a titanium cylindrical sinker with ferrite core and descends concentrically under the influence of gravity through a close-fitting titanium tube. The movement of the sinker was detected by electrical induction through coils surrounding the tube. For the oil and fatty acids, the calculated dynamic viscosity increased according to the model η=ηo exp (β p). The coefficients were readily obtained by linearizing experimental data for sinker fall-times and found to be dependent on the chain length and degree of saturation

Usos y desusos del patrimonio cultural: retos para la inclusión social en la ciudad de México

Quien arriba o no a los museos no ha sido objeto de una atención prioritaria por\ud parte de éstos, generalmente concentrados en acrecentar, proteger y poner en escena sus\ud acervos. El artículo analiza los factores que han impulsado el cambio de esta situación y que\ud plantean nuevos retos a los museos, entre ellos el de atraer nuevos públicos y generar recursos,\ud pero también el de reconceptualizar su función como instituciones incorporadas al desarrollo\ud económico y cultural de la sociedad contemporánea. La autora muestra las potencialidades\ud de los estudios de público para cumplir estos retos, basándose en el análisis de estadísticas\ud de asistencia y exponiendo estudios cualitativos de públicos de patrimonio arquitectónico y\ud de museos de la ciudad de México

Role of ventilation in airborne transmission of infectious agents in the built environment - a multidisciplinary systematic review

There have been few recent studies demonstrating a definitive association between the transmission of airborne infections and the ventilation of buildings. The severe acute respiratory syndrome (SARS) epidemic in 2003 and current concerns about the risk of an avian influenza (H5N1) pandemic, have made a review of this area timely. We searched the major literature databases between 1960 and 2005, and then screened titles and abstracts, and finally selected 40 original studies based on a set of criteria. We established a review panel comprising medical and engineering experts in the fields of microbiology, medicine, epidemiology, indoor air quality, building ventilation, etc. Most panel members had experience with research into the 2003 SARS epidemic. The panel systematically assessed 40 original studies through both individual assessment and a 2-day face-to-face consensus meeting. Ten of 40 studies reviewed were considered to be conclusive with regard to the association between building ventilation and the transmission of airborne infection. There is strong and sufficient evidence to demonstrate the association between ventilation, air movements in buildings and the transmission/spread of infectious diseases such as measles, tuberculosis, chickenpox, influenza, smallpox and SARS. There is insufficient data to specify and quantify the minimum ventilation requirements in hospitals, schools, offices, homes and isolation rooms in relation to spread of infectious diseases via the airborne route. © 2007 The Authors Journal compilation 2007 Blackwell Munksgaard