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Related Concept Videos

Real Number Operations01:27

Real Number Operations

339
The concept of real numbers includes all the values that can be represented on a continuous number line. The system began with basic counting values used for enumeration. It later expanded to include values that represent the absence of quantity and opposites of the counting values. When situations required expressing parts of a whole or dividing quantities evenly, values capable of representing such proportions were developed. When written using decimal notation, these values can end or repeat...
339
Reinforcement Schedules01:24

Reinforcement Schedules

513
Positive reinforcement is a powerful method for teaching new behaviors to both animals and humans. B.F. Skinner demonstrated this with his experiments using rats in a Skinner box. When a rat pressed a lever, it received a food pellet. This immediate reward encouraged the rat to repeat the behavior. This method, where a reward follows every instance of the behavior, is known as continuous reinforcement. It is highly effective for establishing new behaviors quickly.
Once a behavior is learned,...
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Operational Amplifiers01:17

Operational Amplifiers

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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Vector Operations01:20

Vector Operations

2.3K
Vectors are physical quantities that have both magnitude and direction. The vector operations include addition, subtraction, and scalar multiplication.
A vector multiplied by a scalar value is called scalar multiplication. The result obtained is a new vector with a different magnitude. If the scalar is positive, the direction of the vector remains the same, but if it is negative, the direction of the vector is reversed. For example, the product of the mass and velocity yields the momentum.
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Operant Conditioning01:21

Operant Conditioning

2.9K
Operant conditioning, a key concept in behavioral psychology, involves using reinforcement and punishment to alter the likelihood of a behavior being repeated. B.F. introduced this type of conditioning. Skinner focused on voluntary behaviors and the consequences that follow them, influencing whether these behaviors will be strengthened or diminished.
Reinforcement in operant conditioning can be positive or negative, both of which serve to increase the likelihood of a behavior. Positive...
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Second Derivatives and Laplace Operator01:22

Second Derivatives and Laplace Operator

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The first order operators using the del operator include the gradient, divergence and curl. Certain combinations of first order operators on a scalar or vector function yield second order expressions. Second-order expressions play a very important role in mathematics and physics. Some second order expressions include the divergence and curl of a gradient function, the divergence and curl of a curl function, and the gradient of a divergence function.
Consider a scalar function. The curl of its...
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Related Experiment Video

Updated: Feb 8, 2026

A Do-it-yourself System for Scheduled Feeding of Laboratory Rodents in Their Home Cage
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Published on: June 6, 2025

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Elective Surgery Cancellations During the Time Between Scheduling and Operation.

Elina Turunen, Merja Miettinen, Leena Setälä

    Journal of Perianesthesia Nursing : Official Journal of the American Society of Perianesthesia Nurses
    |April 22, 2018
    PubMed
    Summary

    Most elective surgery cancellations occur before the day of surgery due to patient unsuitability or resource shortages. Addressing these early-stage issues can improve surgical scheduling and patient care.

    Keywords:
    elective surgeryoperative effectivenesspreoperative caresurgery cancellation

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    Area of Science:

    • Healthcare Management
    • Surgical Operations
    • Patient Flow Optimization

    Background:

    • Surgery cancellations negatively impact patients, staff, and healthcare finances.
    • Day-of-surgery cancellations are a known metric, but earlier cancellations are understudied.

    Purpose of the Study:

    • To quantify the reasons, frequency, and timing of elective surgery cancellations post-scheduling.
    • To identify key factors contributing to preoperative cancellations.

    Main Methods:

    • A qualitative prospective follow-up study design was employed.
    • Data collected over two months across 13 surgical specialties.
    • Analysis involved inductive content analysis and statistical methods.

    Main Results:

    • The majority of cancellations happened before the scheduled surgery date.
    • Primary reasons included patient unsuitability for surgery and insufficient organizational resources.
    • Cancellations occurred at various points in the preoperative waiting period.

    Conclusions:

    • Focusing on patient suitability and resource availability earlier in the preoperative phase is crucial.
    • Proactive management of these factors can reduce elective surgery cancellations.
    • Improved preoperative planning can enhance operative effectiveness and resource allocation.