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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

25.3K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Weak Acid Solutions04:02

Weak Acid Solutions

43.2K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
219.9K
Diffusion01:21

Diffusion

6.4K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
6.4K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

4.9K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
4.9K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.3K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.3K

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Aberration recovery by imaging a weak diffuser.

Gautam Gunjala, Stuart Sherwin, Aamod Shanker

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    Summary
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    We developed a new computational method to precisely recover optical system aberrations using a weak diffuser and multiple angled images. This technique simplifies aberration calibration for improved optical performance.

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    Area of Science:

    • Optics and Photonics
    • Computational Imaging
    • Optical Metrology

    Background:

    • Aberrations in optical systems degrade image quality and necessitate accurate calibration.
    • Field-varying aberrations are challenging to quantify, especially in complex optical designs.

    Purpose of the Study:

    • To present a novel computational method for recovering field-varying aberrations in optical systems.
    • To enable quantitative aberration recovery using a simple diffuser and plane wave illumination.

    Main Methods:

    • Imaging a weak, index-matched diffuser with plane wave illumination at distinct angles.
    • Employing a statistical image formation model relating the speckled intensity image spectrum to local aberrations.
    • Treating the diffuser as a wide-sense stationary scattering object, removing the need for precise surface knowledge.

    Main Results:

    • The method uniquely determines system aberrations up to a sign.
    • Aberrations are recovered quantitatively across the field-of-view.
    • Successful validation through both numerical simulations and experimental measurements.

    Conclusions:

    • The proposed computational method offers a reliable and relatively simple algorithmic approach for aberration calibration.
    • This technique enhances the quantitative recovery of system aberrations in optical imaging.