Results 271 to 280 of about 9,017,946 (303)

Efficient solar energy conversion with CuInS2

Nature, 1986
The high absorptivity associated with a direct energy gap in the optimum range for solar-energy conversion makes CuInS2 a particularly promising material for efficient solar-energy conversion1. Achieved solar-to-electrical conversion efficiencies have been limited to ∼6% (refs 2–8).
H. J. Lewerenz, H. Goslowsky, K.-D. Husemann, S. Fiechter   +3 more
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Functionalization of Graphene for Efficient Energy Conversion and Storage

Accounts of Chemical Research, 2012
As global energy consumption accelerates at an alarming rate, the development of clean and renewable energy conversion and storage systems has become more important than ever. Although the efficiency of energy conversion and storage devices depends on a variety of factors, their overall performance strongly relies on the structure and properties of the
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High Energy Conversion Efficiency in Nanofluidic Channels

Nano Letters, 2012
It is proposed that the layering of large ions at the wall/liquid interface of nanofluidic channels can be used to achieve high efficiency (possibly >50%) in the conversion of hydrostatic energy into electrical power. Large ions tend to produce peaks and troughs in their concentration profiles at charged walls, producing high concentrations far from ...
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Energy Conversion in Thermocells: Efficiency Calculations

Journal of The Electrochemical Society, 1990
The quantities which enter the definition of thermodynamic efficiency are the work performed and the heat delivered to the system. If these quantities are taken for a cyclic process, one may speak about the total efficiency. The Carnot efficiency gives the theoretical maximum limit for the total efficiency.
Tamio Ikeshoji, Signe Kjelstrup Ratkje
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Efficiency-coefficients in energy conversions with cogeneration

Energy, 1982
Abstract Energy-conversion processes with cogeneration, such as the simultaneous production of electricity and heat from coal, are considered. General feasibility conditions, which originate in the laws of thermodynamics and in economic conditions, are given. The question how such processes can be characterized by efficiency coefficients is discussed
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Wind Energy Conversion Efficiency Limit

Wind Engineering, 2006
The momentum analysis of Sharpe [3] is considered further. It is shown that the maximum wind energy conversion efficiency limit, or the Betz limit of 59.3%, deduced from conventional actuator disc theory is the limiting stationary maximum value as wind turbine rotor speed approaches infinity and rotor outlet swirl approaches zero.
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Power Chips for Efficient Energy Conversion

AIP Conference Proceedings, 2004
The Power Chips technology employs a gap of 4–10 nanometers in a gap diode to allow for efficient thermal conversion with very low thermal leakage. The design ΔT is on the order of 400 degrees single stage, with operation possible from 1 K to 1600 K, depending on configuration and meeting engineering challenges.
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Photosynthetic energy conversion efficiency in the ocean

2021
The foundation of almost every ecosystem on Earth relies on photosynthetic organisms to convert sunlight energy into chemical bond energy. In aquatic ecosystems a diverse group of single celled organisms called phytoplankton are the prevalent gateway for biological energy, responsible for nearly half of Earth’s net primary production.
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Energy Conversion Efficiency of Wave Gliders

Membrane Technology
Wave gliders are a new type of ocean observation platform that can gain forward power by receiving and converting wave energy. The ability of wave gliders to turn waves determines the speed, maneuverability, and precision of wave gliders’ navigation control in various sea conditions.
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A high-efficiency energy conversion system

IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference, 2002
Introduces a fundamentally new method for converting pressure into rotative motion. An historical background is given. An idealized nonturbine Brayton cycle manometric engine and associated equations are described. Salient features are explained, together with suggested applications.
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