New family of potentials with analytical twiston-like solutions

In this letter we present a new approach to find analytical twiston models. The effective two-field model was constructed by a non-trivial combination of two one field systems. In such an approach we successfully build analytical models which are satisfied by a combination of two defect-like solutions, where one is responsible to twist the molecular chain by $180^{\,0}$, while the other implies in a longitudinal movement. Such a longitudinal movement can be fitted to have the size of the distance between adjacent molecular groups. The procedure works nicely and can be used to describe the dynamics of several other molecular chains.Comment: 7 pages, 3 figure

Metodologias de laboratório para compactação de solos para análise de desenvolvimento de plantas.

Equipamentos utilizados; Solos; Ensaios.bitstream/CPPSE/17483/1/Documentos-74.pdfISSN 1980-684

Comparação dos níveis de ácido cianídrico (HCN) entre etnovariedades de mandiocas bravas e mansas.

Disponível também on-line. Publicado também no Anais do XII Congresso Brasileiro da Mandioca, Paranavaí, 2007

Two Experimental Approaches of Looking at Buoyancy

In our teaching practice, we find that a large number of first-year university physics and chemistry students exhibit some difficulties with applying Newton's third law to fluids because they think fluids do not react to forces. (c) 2013 American Association of Physics Teachers

Melhoria dos canais de comunicação da cadeia de suprimentos no setor de patrimônio e materiais (SPM) da Embrapa Florestas.

bitstream/item/25633/1/186-10.pd

Universal reduction of pressure between charged surfaces by long-wavelength surface charge modulation

We predict theoretically that long-wavelength surface charge modulations universally reduce the pressure between the charged surfaces with counterions compared with the case of uniformly charged surfaces with the same average surface charge density. The physical origin of this effect is the fact that surface charge modulations always lead to enhanced counterion localization near the surfaces, and hence, fewer charges at the midplane. We confirm the last prediction with Monte Carlo simulations.Comment: 8 pages 1 figure, Europhys. Lett., in pres