The Effect of Laminar Flow on Rotor Hover Performance

Abstract: The topic of laminar flow effects on hover performance is introduced with respect to some historical efforts where laminar flow was either measured or attempted. An analysis method is outlined using combined blade element, momentum method coupled to an airfoil analysis method, which includes the full e(sup N) transition model. The analysis results compared well with the measured hover performance including the measured location of transition on both the upper and lower blade surfaces. The ana...

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No evidence of gender bias in philosophy

Despite being a male-dominated field, a recent study has found no evidence for gender bias against women in philosophy, in terms of securing tenure-track positions as college professors. Good news, but why aren't there more women in philosophy?

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Are current efforts to combat terrorism actually increasing the risk of future attacks?

A public health perspective of the rise in terrorism and violent radicalization points to social determinants of health including discrimination, social isolation, and stigmatization of groups such as Muslims or Arab American as factors that can make people more vulnerable to extremist influences. The social determinants and risk factors for violent radicalization that contribute to terrorist activities is the focus of an insightful new article published in Health Equity.

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David Parker interview at Le Bourget

Interview with ESA's head of human spaceflight and robotic exploration David Parker at the Paris Air and Space Show, on the first European commercial opportunity to conduct research in space, 20 June 2017.
Dubbed ‘Ice Cubes’, the service offers room to run experiments and conduct research in weightlessness inside ESA’s Columbus laboratory on the International Space Station. It will allow experiments to run for over four months in space.

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David Parker interview at Le Bourget

Interview with ESA's head of human spaceflight and robotic exploration David Parker at the Paris Air and Space Show, on the first European commercial opportunity to conduct research in space, 20 June 2017.
Dubbed ‘Ice Cubes’, the service offers room to run experiments and conduct research in weightlessness inside ESA’s Columbus laboratory on the International Space Station. It will allow experiments to run for over four months in space.

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Scientists develop innovative, atomic resonance-based method to measure electric fields

In the last decades, mobile phones and other wireless devices have become central features of life around the globe. These devices radiate varied amounts of electromagnetic energy and thus project electric fields into the surrounding space. It is crucial to the design and deployment of these devices that they have accurate and traceable measurements for electric fields and radiated power. Until recently, however, it was not possible to build self-calibrating probes that could generate independent and absolute measurements of these electric field values.

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Wave beams mix and stir the ocean to create climate

Ocean circulation patterns have a profound effect on global climate. Waves deep within the ocean play an important role in establishing this circulation, arising when tidal currents oscillate over an uneven ocean bottom. The internal waves that are generated by this process stir and mix the ocean, bringing cold, deep water to the surface to be warmed by the sun.

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Cow herd behavior is fodder for complex systems analysis

The image of grazing cows in a field has long conjured up a romantic nostalgia about a relaxed pace of rural life. With closer inspection, however, researchers have recognized that what appears to be a randomly dispersed herd peacefully eating grass is in fact a complex system of individuals in a group facing differing tensions. A team of mathematicians and a biologist has now built a mathematical model that incorporates a cost function to behavior in such a herd to understand the dynamics of such systems.

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Uncertainties in Coastal Ocean Color Products: Impacts of Spatial Sampling

Abstract: With increasing demands for ocean color (OC) products with improved accuracy and well characterized, per-retrieval uncertainty budgets, it is vital to decompose overall estimated errors into their primary components. Amongst various contributing elements (e.g., instrument calibration, atmospheric correction, inversion algorithms) in the uncertainty of an OC observation, less attention has been paid to uncertainties associated with spatial sampling. In this paper, we simulate MODIS (aboard bot...

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Illuminating a better way to calculate excitation energy

Glow sticks, like those brandished by trick-or-treaters and partygoers, light up due to excited electrons of the molecules in the contained fluorescent dye. Electrons accept the exciting energy from a chemical reaction that results when an inner tube in the glow stick is cracked and two fluids come into contact. After exciting to a higher energy level, they relax back to a lower energy by releasing light that can guide young candy hunters in costumes.

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