Sanity Checks
Sanity Checks - Related Videos
07:35
Safety Checks and Ten Rights of Medication Administration
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2015
According to the landmark 1999 Institute of Medicine report To Err is Human: Building a Safer Health System, medication errors are a leading cause of preventable harm and death in hospitals. To mitigate these errors and enhance patient safety, nurses must consistently adhere to the Ten Rights of medication administration. These include the right patient, right medication, right dose, right time, right route, right documentation, right education, right to refuse, right assessment, and right...
04:53
Electrical Safety
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2023
Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Among the many hazards present in the laboratory, electrical hazards are one of the most common we must be cognizant of since most of the laboratory equipment we use requires electricity for operation. Improper handling or operation of electrical devices might lead to electric shock with the potential risk of injury or even death. Electric sparks can lead to fire or explosion (since many flammable...
01:29
Protein Folding Quality Check in the RER
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2023
ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
01:28
Survey Safety
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2025
Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
09:36
Electrical Safety Precautions and Basic Equipment
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Electric machines and power electronics experiments involve electrical currents, voltages, power, and energy quantities that should be handled with extreme diligence and care. These may include three-phase AC voltage (208 V, 230 V, or 480 V), up to 250 V DC voltages, and currents that can reach 10 A. Electrocution occurs when an electrical path is established through the body with very low currents...
FAQs
Dimensional analysis compares the physical dimensions of each term and the final result. Quantities combined by addition must have compatible units, while the answer should carry the dimensions expected for the stated physical variable. A mismatch can reveal an algebraic error, an omitted factor, or an inappropriate equation before numerical values make the result appear plausible.
An order-of-magnitude estimate tests whether a result falls within a physically credible scale, even when the exact calculation is complicated. A value that differs greatly from the expected scale may indicate incorrect parameters, assumptions, or arithmetic. This comparison helps distinguish a meaningful unusual result from an outcome produced by a mistake in the model or derivation.
A limiting-case check examines the model when a relevant parameter becomes very small, very large, or reaches a boundary value. The predicted behavior should remain physically sensible and consistent with the conditions represented by that limit. Unexpected behavior can expose an invalid approximation, an incorrect sign, or a formula that does not apply across the assumed range.
Conservation laws test whether a calculation preserves quantities that the model requires to remain consistent, while boundary conditions test whether the solution matches specified constraints at relevant limits or interfaces. Failure in either check can identify an incorrect assumption or derivation. Agreement does not prove the result, but it increases confidence that the model is internally consistent.
First, inspect the dimensions and units of the equations and final quantity. Next, estimate the expected order of magnitude, examine relevant limiting cases, and compare the result with conservation laws or known boundary conditions. If a discrepancy appears, researchers can revisit algebra, signs, assumptions, or parameters before investing effort in a full rederivation or repeated experiment.
Sanity checks are most useful before accepting a derivation, model prediction, or experimental result as reliable. Applying them early can catch errors while the calculation is still easy to revise, and applying them after obtaining a result can test whether the outcome deserves more detailed analysis. They can therefore reduce unnecessary repetition and guide focused model refinement.
Their specific tests can be applied to mechanics, thermodynamics, electromagnetism, and quantum systems without requiring the same equations in each field. Units, scale, limiting behavior, conservation, and boundary consistency provide general standards for judging results. These checks help researchers separate algebraic or modeling problems from results that are physically meaningful and warrant further investigation.