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[Perspective] Tracking the merry dance of nanoparticles

17-Jul-2015 | Christian Colliex, Science , 2015

Nanoparticles containing a few tens or hundreds of atoms have applications in an ever-expanding range of areas, from electronics to catalysis and biological sensors. This versatility stems from the high sensitivity of nanoparticle properties to size, chemical composition, and shape, which are ...

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[Report] Keeping cool: Enhanced optical reflection and radiative heat dissipation in Saharan silver ants

17-Jul-2015 | Norman Nan Shi; Cheng-Chia Tsai; Fernando Camino; Gary D. Bernard; Nanfang Yu; Rüdiger Wehner, Science , 2015

Saharan silver ants, Cataglyphis bombycina, forage under extreme temperature conditions in the African desert. We show that the ants’ conspicuous silvery appearance is created by a dense array of triangular hairs with two thermoregulatory effects. They enhance not only the reflectivity of the ...

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[Report] 3D structure of individual nanocrystals in solution by electron microscopy

17-Jul-2015 | Jungwon Park; Hans Elmlund; Peter Ercius; Jong Min Yuk; David T. Limmer; Qian Chen; Kwanpyo Kim; Sang Hoon Han; Davi ..., Science , 2015

Knowledge about the synthesis, growth mechanisms, and physical properties of colloidal nanoparticles has been limited by technical impediments. We introduce a method for determining three-dimensional (3D) structures of individual nanoparticles in solution. We combine a graphene liquid cell, ...

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Energies, Vol. 8, Pages 7243-7260: Reinforcement Learning–Based Energy Management Strategy for a Hybrid Electric Tracked Vehicle

16-Jul-2015 | Liu, Teng ; Zou, Yuan ; Liu, Dexing ; Sun, Fengchun, Energies, 2015

This paper presents a reinforcement learning (RL)–based energy management strategy for a hybrid electric tracked vehicle. A control-oriented model of the powertrain and vehicle dynamics is first established. According to the sample information of the experimental driving schedule, statistical ...

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Energies, Vol. 8, Pages 7224-7242: Coordinated Control Strategies of VSC-HVDC-Based Wind Power Systems for Low Voltage Ride Through

16-Jul-2015 | Zhang, Xinyin ; Wu, Zaijun ; Hu, Minqiang ; Li, Xianyun ; Lv, Ganyun, Energies, 2015

The Voltage Source Converter-HVDC (VSC-HVDC) system applied to wind power generation can solve large scale wind farm grid-connection and long distance transmission problems. However, the low voltage ride through (LVRT) of the VSC-HVDC connected wind farm is a key technologyissue that must be ...

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Dendrimer nanotechnology for enhanced formulation and controlled delivery of resveratrol

14-Jul-2015 | Abhay S. Chauhan, Annals of the New York Academy of Sciences, 2015

In spite of its wide and beneficial pharmacological potential, resveratrol lags behind other compounds because of its comparatively less impressive pharmacokinetic profile. Resveratrol has very low oral bioavailability and, from a formulation perspective, it has low solubility in water, which ...

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Three-ring circus without a ringmaster: Self-organization of supracellular actin ring patterns during epithelial morphogenesis [Biophysics and Computational Biology]

14-Jul-2015 | Nir S. Gov; Saoirse S. McSharry; Greg J. Beitel, Proceedings of the National Academy of Sciences current issue, 2015

Formation of patterns during development has been a long-standing puzzle. Alan Turing proposed chemical gradients as a solution to the problem (1), and many chemical signals that pattern cells have since been found. However, only recently have roles for mechanical forces in patterning become ...

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Hydrodynamic collective effects of active protein machines in solution and lipid bilayers [Physics]

14-Jul-2015 | Alexander S. Mikhailov; Raymond Kapral, Proceedings of the National Academy of Sciences current issue, 2015

The cytoplasm and biomembranes in biological cells contain large numbers of proteins that cyclically change their shapes. They are molecular machines that can function as molecular motors or carry out various other tasks in the cell. Many enzymes also undergo conformational changes within their ...

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[Feature] Deep sleep

10-Jul-2015 | Warren Cornwall, Science , 2015

Scientists are reviving an old and largely discarded idea for disposing of the United States' most radioactive nuclear waste: sticking it down holes drilled 5 kilometers into Earth's crust. The renewed interest in deep boreholes comes as the federal government struggles to find a way to rid ...

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Energies, Vol. 8, Pages 6910-6925: Exergy Analysis of a Two-Pass Reverse Osmosis (RO) Desalination Unit with and without an Energy Recovery Turbine (ERT) and Pressure Exchanger (PX)

10-Jul-2015 | Eshoul, Nuri M.; Agnew, Brian ; Al-Weshahi, Mohammed A.; Atab, Mohanad S., Energies, 2015

This paper presents an exergy analysis of an actual two-pass (RO) desalination system with the seawater solution treated as a real mixture and not an ideal mixture. The actual 127 ton/h two pass RO desalination plant was modeled using IPSEpro software and validated against operating data. The ...

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