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Inertial Frames of Reference01:03

Inertial Frames of Reference

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
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Related Rates01:18

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When two or more physical quantities are linked by a single relationship, a change in one variable necessarily affects the others. This interdependence forms the basis of related rates analysis, which examines how different quantities change with respect to time. A classic physical example is an expanding balloon, where the size of the balloon changes continuously as air is added.For a hot air balloon, the inflated envelope is commonly idealized as a perfect sphere to simplify mathematical...
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Improving Colorectal Cancer Screening Rates in Patients Referred to a Gastroenterology Clinic.

Benjamin L Bick, Mustapha El-Halabi, Keaton R Jones

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    |January 17, 2019
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    Systematic discussions about colorectal cancer (CRC) screening options, including colonoscopy and fecal immunochemistry testing (FIT), significantly increased screening rates in Veterans and county hospital patients. This approach improved participation among previously unscreened individuals.

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    Area of Science:

    • Gastroenterology
    • Oncology
    • Public Health

    Background:

    • Colorectal cancer (CRC) is a leading cause of cancer death in the US.
    • Colonoscopy and fecal immunochemistry testing (FIT) are key CRC screening methods.
    • Improving CRC screening rates in specific patient populations remains a challenge.

    Purpose of the Study:

    • To enhance CRC screening uptake among Veterans and county hospital patients.
    • To identify barriers to CRC screening in a gastroenterology clinic setting.
    • To evaluate the effectiveness of systematic screening discussions.

    Main Methods:

    • A study involving 717 patients aged 49-75 years referred to gastroenterology fellow's clinics.
    • Analysis of screening history, including reasons for non-screening (not offered or declined).
    • Systematic discussions about colonoscopy and FIT options with 78 unscreened patients.

    Main Results:

    • 15.2% of patients had not undergone previous CRC screening.
    • Of 78 unscreened patients discussed, 71.8% (56 patients) underwent screening (32 colonoscopy, 24 FIT).
    • Patients seen by senior fellows showed higher screening agreement (100% vs. 66.2%).

    Conclusions:

    • Systematic discussions about CRC screening modalities effectively increase screening rates.
    • Addressing patient barriers and offering clear choices for colonoscopy and FIT are crucial.
    • Fellow training level may influence patient adherence to screening recommendations.