Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

500
Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
500
Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

378
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
378
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

724
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
724
Design Example: Forces in Sluice Gate01:11

Design Example: Forces in Sluice Gate

2.8K
In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
2.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Activity of VMS-projecting mPFC neurons encodes individual vulnerability to chronic restraint stress in male mice.

Neurobiology of stress·2026
Same author

An Ultrasensitive Label-Free Aptasensor for Insulin Detection Assisted by Exonuclease III and 2-Aminopurine.

Molecules (Basel, Switzerland)·2026
Same author

Sensorimotor circuit connectivity as a candidate biomarker for responsiveness to sertraline in obsessive-compulsive disorder.

Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology·2026
Same author

Clinical application of hysteroscopic decidual polypectomy in pregnant women.

BMC pregnancy and childbirth·2026
Same author

Effects of Lactiplantibacillus plantarum LP18 on growth performance, immune function, gut microbiota, serum metabolome, and disease resistance in Luhua chicks.

Poultry science·2025
Same author

Study on a growth promoting effect and mechanism of the extract of stem and leaf from <i>Atractylodes lancea</i> DC. on nile tilapia.

Natural product research·2025

Related Experiment Video

Updated: Jan 13, 2026

A Microfluidic-based Hydrodynamic Trap for Single Particles
10:13

A Microfluidic-based Hydrodynamic Trap for Single Particles

Published on: January 21, 2011

17.2K

Safety-oriented passenger flow control at a congested metro hub: A microscopic approach.

Jun Zhang1, Dongdong Shi1, Wei Yang2

  • 1School of Transportation and Logistics, National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.

Accident; Analysis and Prevention
|January 6, 2026
PubMed
Summary

This study introduces a safety-focused method for controlling metro hub crowds using microscopic simulation and dynamic gate delays. The approach effectively stabilizes crowd danger and enhances overall passenger safety and service efficiency.

Keywords:
Crowd dangerModel predictive control (MPC)Passenger flow controlPedestrian dynamicsPedestrian microscopic simulationSystem identification

More Related Videos

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
14:55

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street

Published on: January 20, 2023

4.2K
Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
09:34

Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment

Published on: July 12, 2016

9.9K

Related Experiment Videos

Last Updated: Jan 13, 2026

A Microfluidic-based Hydrodynamic Trap for Single Particles
10:13

A Microfluidic-based Hydrodynamic Trap for Single Particles

Published on: January 21, 2011

17.2K
Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
14:55

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street

Published on: January 20, 2023

4.2K
Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
09:34

Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment

Published on: July 12, 2016

9.9K

Area of Science:

  • Transportation Engineering
  • Urban Planning
  • Public Safety

Background:

  • Metro hubs face significant safety risks due to massive passenger influxes.
  • Existing passenger flow control methods primarily focus on macroscopic, service-oriented approaches, neglecting microscopic crowd risk mitigation.

Purpose of the Study:

  • To develop a safety-oriented passenger flow control method for metro hubs using a microscopic pedestrian simulation model.
  • To introduce a dynamic entry ticket gate service time delay strategy to mitigate crowding risks.
  • To enable real-time decision-making in stochastic environments for crowd management.

Main Methods:

  • Development of a two-level microscopic pedestrian simulation model (tactical and operational levels).
  • Implementation of the Social Force Model (SFM) for pedestrian movement simulation.
  • Integration of Model Predictive Control (MPC) with a Kalman filter for dynamic gate service time delay strategy.
  • Definition of crowd danger as the control objective based on pedestrian dynamics.

Main Results:

  • The proposed method effectively stabilizes the crowd danger metric around a predefined target level.
  • Increasing the crowd danger reference value leads to intensified fluctuations in crowd behavior.
  • The approach improves platform service levels alongside station hall safety.

Conclusions:

  • A safety-oriented, microscopic approach to passenger flow control in metro hubs is effective.
  • Optimizing the crowd danger reference value is crucial for stable control.
  • The strategy enhances both safety and service efficiency, applicable to broader passenger flow management.