1,772 research outputs found
Procedimentos de cálculo para a quantificação da necessidade hĂdrica e do suprimento de água Ă cultura do amendoim no municĂpio de Barbalha-CE.
bitstream/CNPA/18377/1/COMTEC284.pd
Developing personas and proto personas to enhance the art museum visitor experience
This paper aims to study and think about the use of personas and proto personas
on the art museum visitors’ experience. Its object of study is the educational
services of art museums focusing on children and young people up to the age of
18. This is a hybrid - conceptual and empirical – and exploratory study. Conducted
through a qualitative methodology, constructivist paradigm and design approach.
It relies on critical and creative thinking, as well on data collection. Using a total
of 36 interviews to teachers/educators and legal tutors, divided into two distinct
phases, and three pre-test interviews. It expands the investigation of application
of the construction of personas and proto personas in the management of
educational services in art museums. The value of this study lies in exploration of
the construction of personas and in a learning context Do - Feel - Learn instead of
the traditional “Learn - Feel - Do”.info:eu-repo/semantics/publishedVersio
Quantum Dynamics in a Time-dependent Hard-Wall Spherical Trap
Exact solution of the Schr\"{o}dinger equation is given for a particle inside
a hard sphere whose wall is moving with a constant velocity. Numerical
computations are presented for both contracting and expanding spheres. The
propagator is constructed and compared with the propagator of a particle in an
infinite square well with one wall in uniform motion.Comment: 6 pages, 4 figures, Accepted by Europhys. Let
General approach for studying first-order phase transitions at low temperatures
By combining different ideas, a general and efficient protocol to deal with
discontinuous phase transitions at low temperatures is proposed. For small
's, it is possible to derive a generic analytic expression for appropriate
order parameters, whose coefficients are obtained from simple simulations. Once
in such regimes simulations by standard algorithms are not reliable, an
enhanced tempering method, the parallel tempering -- accurate for small and
intermediate system sizes with rather low computational cost -- is used.
Finally, from finite size analysis, one can obtain the thermodynamic limit. The
procedure is illustrated for four distinct models, demonstrating its power,
e.g., to locate coexistence lines and the phases density at the coexistence.Comment: 5 page
Aplicação fracionada de nitrogênio no algodoeiro irrigado.
bitstream/CNPA/18339/1/BOLETIM72.pd
Improving light harvesting in polymer photodetector devices through nanoindented metal mask films
To enhance light harvesting in organic photovoltaic devices, we propose the incorporation of a metal (aluminum) mask film in the system’s usual layout. We fabricate devices in a sandwich geometry, where the mask (nanoindented with a periodic array of holes of sizes d and spacing s) is added between the transparent electrode and the active layer formed by a blend of the semiconducting polymer P3HT and substituted fullerene. Its function is to promote trapping of the incident light into the device’s cavity (the region corresponding to the active layer). For d, we set a value that allows light diffraction through the holes in the relevant absorption range of the polymer. To optimize the mask structure, we consider a very simple model to determine the s leading to trapped fields that are relatively intense and homogeneous within the device. From measurements of the action spectra, we show that, indeed, such architecture can considerably improve the resulting photocurrent efficiencies—one order of magnitude in the best situation studied.
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