Nanocontainer aqueous systems for removing polymeric materials from marble surfaces: A new and promising tool in cultural heritage conservation     

Scilla Grassi  Monica Favaro  Patrizia Tomasin  Luigi Dei   《Journal of Cultural Heritage》2009,10(3):347-355

The present study dealt with the characterisation of marble surfaces coated by three kinds of polymeric material usually employed in stones conservation and with the evaluation of the removal of these coatings from the surfaces by means of new nanocontainer aqueous systems constituted of micellar solutions (MS) and oil-in-water microemulsions (MC). The polymeric coatings were also subjected to accelerated artificial ageing in order to detect possible effects associated to natural photochemical ageing. The aim of the work was the assessment of the performance of such nanocontainer aqueous systems taking acetone (Ac) as a reference “traditional” solvent for the removal procedure. The characterisation was carried out by means of Scanning Electron Microscopy (SEM) and Environmental Scanning Electron Microscopy (ESEM), Fourier Transform Infra-Red (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopies and the results obtained showed that the performance of these innovative methods based on nanocontainer aqueous systems can be considered highly promising in the view of a “green approach” to the conservation of cultural heritage.  相似文献   

Identification and remediation of basic cognitive deficits in disadvantaged children     

J R Grassi  A La Morto-Corse 《Journal of learning disabilities》1979,12(7):483-486

  相似文献   

The role of within-trial location of the retention interval in rats’ delayed conditional discrimination performance     

J. S. Cohen  J. Grassi  P. Dowson 《Learning & behavior》1988,16(1):40-46

Rats were trained and tested on delayed conditional discriminations (DCDs) consisting of four possible light and tone stimulus sequences: light-light, tone-tone, light-tone, and tone-light. A lever was presented after the offset of the second or test stimulus, S₂. Two retention intervals (RIs) were present within the DCD task, one (RI-1) between the sample or first stimulus (S₁) and S₂, and the other (RI-2) between S₂ and presentation of the lever. Liquid reinforcement was contingent upon pressing only when S₂ matched S₁ in Experiment 1 or only when S₂ differed from S₁ in Experiment 2. RI-1 and RI-2 were separately increased to 5,10, and 20 sec from 1-sec training conditions. Increasing RI-1 produced greater declines in performance to light S₁ than to tone S₁ in both experiments. No such stimulus modality effect occurred for increases in RI-2 in these experiments. These results indicate that retrospection of S₁ occurred during RI-1 and prospection of a response decision and reward expectancy primarily occurred during RI-2.  相似文献   

New roles and challenges for health information specialists: professional changes over the years     

Scilla Pizzarelli  Rosaria Rosanna Cammarano  Letizia Sampaolo  Maurella Della Seta 《Health information and libraries journal》2019,36(1):101-105

In this article, guest writers from the Istituto Superiore di Sanità in Italy, the leading scientific technical body of the Italian National Health Service present a historic case study considering the role and evolution of the information specialists at their institution over a twenty year period. The paper places a particular emphasis on the initiatives undertaken in consumer health information and health literacy promotion, in order to improve public health in Italy. Areas covered include the development of online health information provision, early strategies to support the improvement of health literacy, and national projects and collaborations. H.S.  相似文献   

Cycling shoe aerodynamics     

Giuseppe Gibertini  Donato Grassi  Carlo Macchi  Giuseppe De Bortoli 《Sports Engineering》2010,12(3):155-161

The present paper describes the activity carried out to investigate the aerodynamic effects of cycling shoes for time trial competitions. This subject has not been widely studied but can be important for an accurate aerodynamic optimisation of a time trial cyclist. The study was carried out by means of wind tunnel testing: an appropriate test setup and an appropriate test procedure (based on “effective angle of attack approach”) were developed in order to produce realistic test conditions. The developed testing procedure was applied to two different shoe models, differently fastened. Furthermore, an important point was the investigation of the overshoe effect. The results showed that the power required to overcome the shoe’s drag is almost a tenth of the total power and that differences between the shoes can affect the cyclist’s performance.  相似文献