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Atomistic Calculations Predict That Boron Incorporation Increases The Efficiency Of Leds（图）
Atomistic Calculations Predict Boron Incorporation Increases Leds
2017/12/18
High-power white LEDs face the same problem that Michigan Stadium faces on game day — too many people in too small of a space. Of course, there are no people inside of an LED. But there are many elect...
Meniscus-Assisted Technique Produces High Efficiency Perovskite PV Films
Meniscus-Assisted Technique Produces Perovskite PV Films
2017/7/24
A new low-temperature solution printing technique allows fabrication of high-efficiency perovskite solar cells with large crystals intended to minimize current-robbing grain boundaries. The meniscus-a...
'Lossless' metamaterial could boost efficiency of lasers and other light-based devices
Lossless metamaterial lasers other light-based devices
2017/3/14
Engineers at the University of California San Diego have developed a material that could reduce signal losses in photonic devices. The advance has the potential to boost the efficiency of various ligh...
Experiments show magnetic chips could dramatically increase computing’s energy efficiency
magnetic chips dramatically increase computing energy efficiency
2016/3/21
In a breakthrough for energy-efficient computing, UC Berkeley engineers have shown for the first time that magnetic chips can actually operate at the lowest fundamental energy dissipation theoret...
Estimating the Impact of Restructuring on Electricity Generation Efficiency: The Case of the Indian Thermal Power Sector
Generation Efficiency Restructuring
2015/9/18
We thank Resources for the Future, the World Bank Research Board and the KCP Trust Fund for research
support and John Besant-Jones for helpful comments. The findings and conclusions of this paper are...
On Stochastic Error and Computational Efficiency of the Markov Chains Monte Carlo Method
Monte Carlo simulation phase coexistence Gibbs ensemble molecular simulation multi-component system
2012/4/24
In Monte Carlo simulations, the thermal equilibria quantities are estimated by ensemble average over a sample set containing a large number of correlated samples. As the stochastic error of the simula...
Photon-induced carrier transport in high efficiency midinfrared quantum cascade lasers
Photon-induced carrier transport midinfrared quantum cascade lasers Optics
2011/8/18
Abstract: A midinfrared quantum cascade laser with high wall-plug efficiency is analyzed by means of an ensemble Monte Carlo method. Both the carrier transport and the cavity field dynamics are includ...
Influences of excitation-dependent bandstructure changes on InGaN light-emitting diode efficiency
excitation-dependent bandstructure InGaN light-emitting diode efficiency Mesoscale and Nanoscale Physics
2011/8/2
Abstract: Bandstructure properties in wurtzite quantum wells can change appreciably with changing carrier density because of screening of quantum-confined Stark effect. An approach for incorporating t...
99% efficiency in collecting photons from a single emitter
collecting photons a single emitter
2011/9/14
In Nature Photonics 5, 166 (2011), we reported on a planar dielectric antenna that achieved 96% efficiency in collecting the photons emitted by a single molecule. In that work the transition dipole mo...
Market efficiency, anticipation and the formation of bubbles-crashes
renormalization group, sociophysics, opinion dynamic, finance
2011/8/31
A dynamical model is introduced for the formation of a bullish or bearish trends driving an asset price in a given market. Initially, each agent decides to buy or sell according to its personal opinio...
Intense Internal and External Fluorescence as Solar Cells Approach the Shockley-Queisser Efficiency Limit
Shockley-Queisser Solar Cells
2011/8/31
Absorbed sunlight in a solar cell produces electrons and holes. But, at the open circuit condition, the carriers have no place to go. They build up in density and, ideally, they emit external fluoresc...
Efficiency of autonomous soft nano-machines at maximum power
Efficiency of autonomous soft nano-machines maximum power
2010/11/22
We consider nano-sized artificial or biological machines working in steady state enforced by imposing non-equilibrium concentrations of solutes or by applying external forces, torques or electric fiel...
Detection efficiency for loophole-free Bell experiments with postselection
Detection efficiency loophole-free Bell experiments postselection
2010/10/21
It is generally assumed that the violation of a Bell inequality by postselected events cannot be used for loophole-free tests of quantum nonlocality. We show that this is not the case if the postselec...
We investigate whether size imposes a fundamental constraint on the efficiency of small thermal
machines. We analyse in detail a model of a small self-contained refrigerator consisting of three qubit...
High efficiency tomographic reconstruction of quantum states by quantum nondemolition measurements
High efficiency tomographic reconstruction of quantum states quantum nondemolition measurements
2010/10/20
We propose a high efficiency tomographic scheme to reconstruct an unknown quantum state of the qubits by using a series of quantum nondemolition (QND) measurements. The proposed QND measurements of th...