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Related Concept Videos

Production Efficiency01:01

Production Efficiency

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Trophic Efficiency00:46

Trophic Efficiency

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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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Efficiency of The Carnot Cycle01:16

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The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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Turnover Number and Catalytic Efficiency01:19

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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Column Efficiency: Plate Theory01:10

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Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
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Column Efficiency: Rate Theory01:12

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The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
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Attojoule-efficient graphene optical modulators.

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    Graphene electro-optic modulators offer compact, attojoule-efficient alternatives to silicon. Optimizing modal area, material broadening, and polarization are key for high-performance hybrid opto-electronic devices.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Photonics

    Background:

    • Silicon-based electro-optic modulators are often bulky and inefficient.
    • Graphene offers potential for compact and energy-efficient modulation.
    • Applications include signal keying, beam steering, and neuromorphic computing.

    Purpose of the Study:

    • To critically discuss the physics and performance of graphene-based electro-optic modulators.
    • To analyze the factors influencing modulator performance, such as index tunability and optical mode.
    • To explore novel hybrid modulator designs for improved energy efficiency and footprint.

    Main Methods:

    • Heterogeneous integration of graphene on silicon platforms.
    • Analysis of graphene's optical properties, including index tunability.
    • Modeling of optical modes and performance metrics (energy-bandwidth, footprint).
    • Investigation of plasmonic-slot structures and multi-layer graphene designs.
    • Utilizing electron beam lithography for Fermi level tuning in transferred graphene.

    Main Results:

    • Reducing modal area and effective material broadening enhances device performance.
    • In-plane waveguide polarization with graphene, particularly in plasmonic-slot structures, improves performance.
    • Multi- or bi-layer graphene designs lead to high device performance.
    • A graphene-based hybrid-photon-plasmon modulator achieved 100 aJ/bit efficiency.

    Conclusions:

    • Graphene-based modulators represent a promising pathway towards attojoule-efficient opto-electronics.
    • Optimizing device design, including material properties and integration strategies, is crucial for performance.
    • This technology enables the development of compact and highly efficient optoelectronic devices.