Characterization of optimal carbon nanotubes under stretching and validation of the Cauchy-Born rule

Carbon nanotubes are modeled as point configurations and investigated by minimizing configurational energies including two-and three-body interactions. Optimal configurations are identified with local minima and their fine geometry is fully characterized in terms of lower-dimensional problems. Under moderate tension, we prove the existence of periodic local minimizers, which indeed validates the so-called Cauchy-Born rule in this setting.Comment: The final publication is available at springerlink.co

An affordable, open-source, microscale conductivity and temperature probe for density measurements in stratified flows

In stratified flows, conductivity (combined with temperature) is often used to measure density. The conductivity probes typically used can resolve very fine spatial scales, but can be fragile, expensive to replace, and sensitive to environmental noise. A complementary instrument, comprising a low-cost and robust probe, would prove valuable in a wide range of applications where resolving extremely small spatial scales is not needed. We propose using micro-USB connectors as the actual conductivity sensors; these have five gold-plated microelectrodes that can be readily exposed for two-wire or four-wire measurements. To take advantage of our choice of sensor, we design a custom electronic board for simultaneous acquisition from four sensors, with conductivity resolution of 0.1%, comparable to typical existing probes. We demonstrate our system through stratified flow experiments. The multi-channel capability can be used to approximately reconstruct density fields, whereas the customizable design enables measuring density near complex boundaries

Micro-USB Connector Pins as Low-Cost, Robust Electrodes for Microscale Water Conductivity Sensing in Oceanographic Research

Motivated by the widespread need to sense water conductivity in oceanography, as well as in other applications in fluid dynamics and environmental monitoring, we propose using the exposed gold-plated pins of readily available micro-USB connectors as miniaturized, parallel finger electrodes. Since the electrodes are 600 μm apart, they grant sub-mm spatial resolution, suitable for most applications. Standard micro-USB cables are an ideal, ready-to-use solution, since they are shielded, are preassembled in different lengths, and enable 2 and 4-wire measurements. In order to take full advantage of these USB probes, we have designed a custom, open-source 4-channel measuring circuit, named "Conduino", consisting of a low-noise (SNR = 60 dB) shield board coupled to an Arduino microcontroller. Experimental results demonstrate sensing performances comparable with state-of-the-art reference instrumentation (0.1% resolution in the 0.1-15 S/m range), with significantly lower cost and increased versatility and reliability

Magnetoelastic thin films at large strains

Starting from the three-dimensional setting, we derive a limit model of a thin magnetoelastic film by means of {\Gamma}-convergence techniques. As magnetization vectors are defined on the elastically deformed configuration, our model features both Lagrangian and Eulerian terms. This calls for qualifying admissible three-dimensional deformations of planar domains in terms of injectivity. In addition, a careful treatment of the Maxwell system in the deformed film is required

Carbon-nanotube geometries: Analytical and numerical results

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Cycling training effects on fat metabolism blood parameters

BACKGROUND: Study the acute and middle term (4 weeks training) effect of cycling training on fat blood hematological parameters, urine, fatigue, and general health in recreational well-trained cyclists. METHODS: Nineteen cyclists underwent five blood sample collections: before and after an incremental maximal ramp test 7 days before day 0 (D-0); before and after 1 hour exhaustion trial test at baseline (D-0); and after 28 days of training (D-28). Age 34.5 years (\ub19.5); weight 74.87 kg (\ub16.6); height 177.3 cm (\ub15.2); BMI 26.3 (\ub14.9); VO2max 53.75 mL/kg/ min (\ub16.01); distance cycled 314.7 km/week (\ub1137.1). RESULTS: Acute effect was strong elevating WBC from 6.27\ub12.34 to 9.01\ub13.63 7103/\ub5L, an increase in LDL and total CHOL, in this respect, existing literature is controversial. No changes in body weight or blood pressure was observed after 1 month of regular training albeit lipid profile significantly improved, as well as GOT. CONCLUSIONS: Effect of a short incremental bout of exercise was to temporary elevated all the blood parameters except MCH and MCHC. A month of intensive training (distance cycled: 314.7\ub1137.1 km/week) significantly improved blood lipids profile with no permanent effect on WBC, blood pressure or body weight, but improved post effort lactate concentration and fatigue perception. Hematuria is confirmed to be a rare occurrence in recreational cyclists. Data can be useful for training monitoring and comparisons with similar groups of athletes, where there is a lack of information in literature and for comparing exercise effects

A ENFERMEIRA PSIQUIÁTRICA E A EQUIPE MULTIPROFISSIONAL

Este trabalho ê o resultado de uma pesquisa realizada junto a vários elementos da equipe psiquiátrica com enfoque multiprofissional. Os autores só acreditam que o trabalho em equipe multiprofissional será efetivo se cada um de seus membros estiver seguro de seu papel e das respectivas funções que o compõem. Foram utilizadas, como parâmetro, as funções do enfermeiro psiquiátrico elaboradas com base na revisão de literatura sobre o papel do enfermeiro.This paper is based on a study on the functions of the nurse, as a member of the multiprofessional team, in one Psychiatric Hospital. The populations interviewed was composed of 16 nurses, 17 phisicians, 7 social workers, 3 occupational therapists and 3 psychologists. The results showed that not even the nurses had a clear idea of their functions. The author's conclusions emphasize the need of a good undergraduate program on Psychiatric Nursing and on continuing education

Monitoring of a coastal zone by independent fast photogrammetric surveys: The case of Monterosso a Mare (Ligurian Sea, Italy)

The Structure-from-Motion photogrammetry (SfM) allows a fast and easy data acquisition and a highly automated data processing, leading to accurate photorealistic point clouds. The results of a SfM-based modeling of the coastal zone of Monterosso a Mare (Eastern Liguria, Italy) are shown here. Four photogrammetric surveys of the area were carried out from both moving surface (boat) and aerial (Unmanned Aerial Vehicle) platforms. The corresponding results were compared in order to provide information about precision and model reliability from fast ad cheap SfM surveys carried out without Ground Control Points (GCPs). The important issue of scale factor evaluation was solved by means of selection of points easily recognizable in each point cloud and measurement of the length of the polyline that connects these points. The ratio between the lengths of the polyline defined on a point cloud and the corresponding polyline defined in a metric reference frame provided the scale factor. The results highlight that the SfM technique can be used in emergency conditions, where GCPs cannot be used, and is compatible with a floating platform-based observation, leading to point clouds whose resolution is some centimeters for an acquisition distance of 100-150 m.Published73-817A. Geofisica per il monitoraggio ambientaleN/A or not JC