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Related Concept Videos

Reducing Line Loss01:18

Reducing Line Loss

370
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
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Constant Volume Calorimetry02:41

Constant Volume Calorimetry

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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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Volume of Distribution01:20

Volume of Distribution

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The apparent volume of distribution (Vd) is a crucial pharmacokinetic parameter representing the hypothetical body fluid volume into which a drug disperses. It is calculated based on the total amount of drug in the body (estimated from the administered dose and bioavailability) divided by the plasma drug concentration. The total amount of drug in the body does not directly refer to the dose given but is derived by accounting for absorption, distribution, metabolism, and excretion processes.
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Work Done During Volume Change01:17

Work Done During Volume Change

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In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
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Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
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Methods of reducing fever01:22

Methods of reducing fever

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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
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Related Experiment Video

Updated: Jan 23, 2026

A Simple and Low-cost Assay for Measuring Ambulation in Mouse Models of Muscular Dystrophy
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Did UberX reduce ambulance volume?

Leon Moskatel1, David Slusky2

  • 1Department of Medicine, Scripps Mercy Hospital, San Diego, California.

Health Economics
|June 26, 2019
PubMed
Summary
This summary is machine-generated.

Ride-sharing services like UberX may reduce ambulance use. UberX entry decreased per capita ambulance volume by 6.7%, suggesting a substitution effect for non-emergency medical transport.

Keywords:
Uberambulancesemergencies

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Area of Science:

  • Health Economics
  • Transportation Studies
  • Public Health

Background:

  • Ambulances are a critical component of emergency medical services.
  • Current ambulance services are often high-intervention and may be overutilized for non-critical situations.
  • This leads to increased costs for patients and healthcare systems.

Purpose of the Study:

  • To investigate if the introduction of UberX (a ride-sharing service) influences the utilization of traditional ambulances.
  • To determine if UberX entry leads to a substitution effect, particularly for low-risk patients.
  • To assess the impact on overall ambulance volume.

Main Methods:

  • Utilized a city-panel over-time dataset.
  • Leveraged the sporadic entry of UberX into markets over multiple years.
  • Employed various statistical specifications to ensure robustness of findings.

Main Results:

  • UberX entry was associated with a significant reduction in ambulance use.
  • Per capita ambulance volume decreased by at least 6.7% following UberX market entry.
  • The observed effect was consistent across different analytical specifications.

Conclusions:

  • Ride-sharing services like UberX can serve as a viable alternative to ambulances for certain patient transport needs.
  • This substitution has the potential to decrease overall ambulance utilization and associated costs.
  • Further research can explore the implications for emergency service resource allocation and patient outcomes.