3,411 research outputs found
Solar: Chris Meigh-Andrews' Sunbeam.
An essay about the ideas and concepts behind Sunbeam, a site-specific projection event by Chris Meigh-Andrew
Gelling of cryogenic oxidizers Final report, 5 May 1965 - 4 Sep. 1966
Freeze dry methods for preparation of ultrafine, particle size lithium fluoride for cryogenic oxidizer
Erősítik-e a társadalmi kirekesztést a smart cityk?
A fejlesztéspolitikában ma a „smart” címkével minden
vonzóbb, eladhatóbb, a kifejezés sokszor a ’környezet-
barát’ vagy ’fenntartható’ szinonimájaként is használa-
tos. A városfejlesztésben az utóbbi idők egyik legfel-
kapottabb paradigmája, globális szintű versengést in-
dítva mind a városok, mind az érdekelt vállalatok között
a kölcsönösen hasznosnak vélt előnyök reményében. A
szerzők egyrészt annak jártak utána, miért éppen most
virágzott fel a smart city mint fejlesztési paradigma, és
milyen tényezők indukálták gyors előretörését. Más-
részt a nemzetközi példák bemutatásán keresztül arra a
kérdésre keresik a választ, milyen társadalmi hatásokkal
járnak ezek a fejlesztések, milyen kihívásokkal kell
szembenézni a smart city fejlesztések kapcsán, és vajon
a jövőben a fejlesztési szereplők képesek lesznek-e ta-
nulni hibáikból, és tudatosan tervezni a hatások összes-
ségével
Dynamical Response of Nanomechanical Oscillators in Immiscible Viscous Fluid for in vitro Biomolecular Recognition
Dynamical response of nanomechanical cantilever structures immersed in a
viscous fluid is important to in vitro single-molecule force spectroscopy,
biomolecular recognition of disease-specific proteins, and the detection of
microscopic dynamics of proteins. Here we study the stochastic response of
biofunctionalized nanomechanical cantilevers beam in a viscous fluid. Using the
fluctuation-dissipation theorem we derive an exact expression for the spectral
density of the displacement and a linear approximation for the resonance
frequency shift. We find that in a viscous solution the frequency shift of the
nanoscale cantilever is determined by surface stress generated by biomolecular
interaction with negligible contributions from mass loading.Comment: 4 pages, 2 figures, RevTex4. See http://nano.bu.edu/ for related
paper
Microtubule dynamics depart from wormlike chain model
Thermal shape fluctuations of grafted microtubules were studied using high
resolution particle tracking of attached fluorescent beads. First mode
relaxation times were extracted from the mean square displacement in the
transverse coordinate. For microtubules shorter than 10 um, the relaxation
times were found to follow an L^2 dependence instead of L^4 as expected from
the standard wormlike chain model. This length dependence is shown to result
from a complex length dependence of the bending stiffness which can be
understood as a result of the molecular architecture of microtubules. For
microtubules shorter than 5 um, high drag coefficients indicate contributions
from internal friction to the fluctuation dynamics.Comment: 4 pages, 4 figures. Updated content, added reference, corrected typo
Statistics in Focus: Population and social conditions. Trends in European education during the last decade. 2011.54
Liquid-like behaviour of gold nanowire bridges
A combination of Focused Ion Beam (FIB) and Reactive Ion Etch (RIE) was used to fabricate free standing gold nanowire bridges with radii of 30 nm and below. These were subjected to point loading to failure at their mid-points using an Atomic Force Microscope (AFM), providing strength and deformation data. The results demonstrate a dimensionally dependent transition from conventional solid metallic properties to liquid-like behaviour including the unexpected reformation of a fractured bridge. The work reveals mechanical and materials properties of nanowires which could have significant impact on nanofabrication processes and nanotechnology devices such as Nano Electro Mechanical Systems (NEMS)
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