Spatially-resolved magnetic resonance study of the dissolution interface between soaps and water

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Isolation and characterization of microsatellite markers for Araucaria angustifolia (Araucariaceae).

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Isolamento e caracterização de marcadores microssatélites para Araucaria angustifólia (Araucariaceae).

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Engineering education in a technology-dependent world

Education is the core of any nation development, of a community or personal. It is for sure a society that is depending on technology for deployment of information, communication, and network in real time. In a short period of time, social technologies have given social interactions the speed and scale of the Internet. It affects the way people work, live and make business.This work intends just to show a little of INTERTECH an event that is happening for more than 24 years and its contributions for engineering and technology education. An endeavor of manyscientists in order to provide a breeding ground for discussions about engineering and technology education so important aspects for the formation of professionals and researchers prepared to face the future. The theme of the congress is Engineering Education in a Technology-Dependent World and it has raised a considerable amount of papers of great valuable

Stability of Chemically Passivated Silicon Electrodes in Aqueous Solutions: Interplay between Bias Voltage and Hydration of the Electrolyte

Chemical passivation of nonoxide semiconductors is a key prerequisite for electrochemical devices that operate in water-based electrolytes. Silicon remains the technologically most important material and organic monolayers based on the hydrosilylation of 1-alkynes have been shown to be a very effective approach to limit the thermodynamically favorable oxidation of the electrode, while still retaining efficient electron transfer across the solid/liquid interface. A large excess of a supporting electrolyte is always added to the solution in order to confine the applied potential gradient to the region close to the surface of the electrode. However, little is known about how the degree of solvation of the electrolyte species is linked to the degradation of the passivating chemistry. Here we test experimentally how electrolytes with different intrinsic hydration levels can influence the protection of the silicon as a function of surface biasing. X-ray photoelectron spectroscopy and contact angle experiments are used to determine under which conditions the chemical protection breaks down and oxidation of the silicon begins. Our results suggest that (i) anions seem to have a bigger impact on the growth of oxide than cations and (ii) the surface chemistry is more effective for protecting the semiconductor surface against oxidation in the presence of weakly hydrated ions. The utilization of strongly hydrated ions as the electrolyte dramatically diminishes the potential range in which the organic monolayer protects the silicon in aqueous environments

Low inbreeding and high pollen dispersal distances in populations of two Amazonian Forest tree species.

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Round Optimal Concurrent Non-Malleability from Polynomial Hardness

Non-malleable commitments are a central cryptographic primitive that guarantee security against man-in-the-middle adversaries, and their exact round complexity has been a subject of great interest. Pass (TCC 2013, CC 2016) proved that non-malleable commitments with respect to commitment are impossible to construct in less than three rounds, via black-box reductions to polynomial hardness assumptions. Obtaining a matching positive result has remained an open problem so far. While three-round constructions of non-malleable commitments have been achieved, beginning with the work of Goyal, Pandey and Richelson (STOC 2016), current constructions require super-polynomial assumptions. In this work, we settle the question of whether three-round non-malleable commitments can be based on polynomial hardness assumptions. We give constructions based on polynomial hardness of Decisional Diffie-Hellman assumption or Quadratic Residuosity or Nth Residuosity, together with ZAPs. Our protocols also satisfy concurrent non-malleability

Force-frequency relationship during dobutamine stress echocardiography predicts exercise tolerance and BNP levels in patients with chronic congestive heart failure

Purpose: D obutamine stress echocardiography (DSE) is widely used to evaluate myocardial contractile reserve; it provides prognostic information in patients with chronic congestive heart failure (CHF). The force?frequency relationship (FFR) is a method for evaluate LV contractility during DSE . The aim of our study is to assess the relationship among FFR, BNP levels, and aerobic exercise capacity in CHF patients. Methods and materials: 37 CHF patients (age 67?8 years, 54% with an ischemic etiology), underwent high dose DSE (up to 40 m g/kg/min). FFR was determined as a ratio between systolic cuff pressure and end-systolic volume (biplane using a Simposon rule) assessed at baseline and peak DSE . BNP levels were determined on blood samples withdrawn at baseline. After a few hours, CHF patients underwent cardiopulmonary exercise test with expired gas measurement. Results: Mean ejection fraction was 32?7% and NHYA class 2.5?0.6. FFR was directly related to peak oxygen consumption (Figure Left), LV ejection fraction (r=0.398, p=0.015) and mitral annulus peak systolic velocity (r=0.428, p=0.013). FFR was inversely related to NYHA class (r=-0.43, p=0.013), LV end-diastolic diameter (r=-0.377, p=0.022), LV intraventricular dyssynchrony (r=-0.394, p=0.016), and BNP levels (Figure Right). At multiple regression analysis, FFR (B=0.502, p= 0.004) and E/Ea ratio (B=-0.336, p=0.044) were the best predictors of exercise tolerance. Conclusions: In patients with stable CHF, impaired myocardial contractility during DSE is related to higher BNP levels and poorer exercise tolerance

Round Optimal Secure Multiparty Computation from Minimal Assumptions

We construct a four round secure multiparty computation (MPC) protocol in the plain model that achieves security against any dishonest majority. The security of our protocol relies only on the existence of four round oblivious transfer. This culminates the long line of research on constructing round-efficient MPC from minimal assumptions (at least w.r.t. black-box simulation)