4,809 research outputs found
Balanced ternary addition using a gated silicon nanowire
We demonstrate the proof of principle for a ternary adder using silicon
metal-on-insulator single electron transistors (SET). Gate dependent rectifying
behavior of a single electron transistor results in a robust three-valued
output as a function of the potential of the SET island. Mapping logical,
ternary inputs to the three gates controlling the potential of the SET island
allows us to perform complex, inherently ternary operations, on a single
transistor
Interface-induced heavy-hole/light-hole splitting of acceptors in silicon
The energy spectrum of spin-orbit coupled states of individual sub-surface
boron acceptor dopants in silicon have been investigated using scanning
tunneling spectroscopy (STS) at cryogenic temperatures. The spatially resolved
tunnel spectra show two resonances which we ascribe to the heavy- and
light-hole Kramers doublets. This type of broken degeneracy has recently been
argued to be advantageous for the lifetime of acceptor-based qubits [Phys. Rev.
B 88 064308 (2013)]. The depth dependent energy splitting between the heavy-
and light-hole Kramers doublets is consistent with tight binding calculations,
and is in excess of 1 meV for all acceptors within the experimentally
accessible depth range (< 2 nm from the surface). These results will aid the
development of tunable acceptor-based qubits in silicon with long coherence
times and the possibility for electrical manipulation
Are we overusing IVF?
Peer reviewedPublisher PD
On difference and doubt as tools for critical engagement with public health
This paper argues that critical public health should reengage with public health as practice by drawing on versions of Science and Technology Studies (STS) that ‘de-centre the human’ and by seeking alternative forms of critique to work inspired by Foucault. Based on close reading of work by Annemarie Mol, John Law, Vicky Singleton and others, I demonstrate that these authors pursue a conversation with Foucault but suggest new approaches to studying contemporary public health work in different settings. Proposing that we ‘doubt’ both the unity of public health and its effects, I argue that this version of STS opens up a space to recognise multiplicity; to avoid idealising what is being criticised; and to celebrate or care for public health practices as part of critique. Finally I oppose the view that considering technologies, materials and microbes leads to micro-level analysis or political neutrality, and suggest that it allows us to reframe studies of public health to account for inequalities and to draw attention to weak or retreating states, active markets and the entangled relations of humans and non-humans across the world
Evaluatie van de verzuringsdoelstellingen: kwantificering van de effecten van emissievarianten op half-natuurlijke terrestrische ecosystemen
In het kader van de evaluatie verzuringsdoelstellingen zijn depositiescenario's geëvalueerd met de dynamische modellen SMART2/MOVE. Het blijkt dat door naijleffecten overschrijdingen van normen kunnen optreden, terwijl kritische depositieniveaus niet meer overschreden worden. De vertraging is ongeveer tien jaar. Voor adequate bescherming van bossen en natuurgebieden is het van belang dat naast Nederlandse ook buitenlandse emissies gereduceerd worden
Aspersor de garrafa PET com conexão de 3/4 de polegada.
O sistema apresentado é uma adaptação do sistema demonstrado pela Emater Paraná na Vitrine Tecnológica de Agroecologia do Show Rural Coopavel 2014, entre os dias 03 e 07 de fevereiro de 2014. O sistema utilizava Alberto Feiden conexões de irrigação por gotejamento para acoplar garrafas de refrigerante de Polite- reftalato de etileno (PET) perfuradas como aspersores encaixadas em mangueiras de polietileno pretas.bitstream/item/139088/1/Aspersor.pd
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