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

Types Of Collisions - I01:04

Types Of Collisions - I

9.5K
When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
9.5K
Types of Collisions - II01:19

Types of Collisions - II

10.1K
When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
10.1K
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision

38.0K
The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
38.0K
Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

15.2K
An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
15.2K
Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

20.7K
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
20.7K
Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

7.0K
It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
7.0K

You might also read

Related Articles

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

Sort by
Same author

[Fluid management in orthotopic liver transplantation].

Zhongguo wei zhong bing ji jiu yi xue = Chinese critical care medicine = Zhongguo weizhongbing jijiuyixue·2006
Same author

Electromagnetic modelling of Raman enhancement from nanoscale substrates: a route to estimation of the magnitude of the chemical enhancement mechanism in SERS.

Faraday discussions·2006
Same author

[Experimental study on protective effects of HupA in the treatment of isocarbophos poisoning].

Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases·2006
Same author

[Complete sequence and gene organization of the Tibetan chicken mitochondrial genome].

Yi chuan = Hereditas·2006
Same author

Liver microcirculation after hepatic artery embolization with degradable starch microspheres in vivo.

World journal of gastroenterology·2006
Same author

A recyclable fluorous (S)-pyrrolidine sulfonamide promoted direct, highly enantioselective Michael addition of ketones and aldehydes to nitroolefins in water.

Organic letters·2006

Related Experiment Video

Updated: Feb 15, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.4K

Collision risk analysis based train collision early warning strategy.

Si-Hui Li1, Bai-Gen Cai1, Jiang Liu1

  • 1School of Electronic and Information Engineering, Beijing Jiaontong University, No.3 Shangyuancun, Haidian District, Beijing, PR China; Beijing Engineering Research Center of EMC and GNSS Technology for Rail Transportation, No 3 Shangyuancun, Haidian District, 100044, Beijing, PR China.

Accident; Analysis and Prevention
|January 12, 2018
PubMed
Summary
This summary is machine-generated.

A new train collision early warning system (TCEWS) accurately calculates collision avoidance time, considering various delays. This system provides a tiered, color-coded warning to mitigate collision risks effectively.

Keywords:
Collision riskTime to avoid collisionTrain collision early warning system

More Related Videos

An R-Based Landscape Validation of a Competing Risk Model
05:37

An R-Based Landscape Validation of a Competing Risk Model

Published on: September 16, 2022

2.6K
Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage
07:29

Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage

Published on: August 31, 2022

2.2K

Related Experiment Videos

Last Updated: Feb 15, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.4K
An R-Based Landscape Validation of a Competing Risk Model
05:37

An R-Based Landscape Validation of a Competing Risk Model

Published on: September 16, 2022

2.6K
Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage
07:29

Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage

Published on: August 31, 2022

2.2K

Area of Science:

  • Railway Engineering
  • Transportation Safety
  • Control Systems

Background:

  • Existing train collision early warning systems (TCEWS) lack robust collision risk evaluation methods.
  • Limited research addresses the precise timing components influencing collision avoidance in railway operations.

Purpose of the Study:

  • To develop and evaluate a novel strategy for assessing collision risk and providing timely warnings for preceding trains.
  • To accurately calculate the time available for collision avoidance by integrating critical timing factors.

Main Methods:

  • Quantified collision avoidance time by analyzing wireless communication latency, driver reaction time, safety distance, and deceleration rates.
  • Defined collision risk based on the calculated time to avoid a collision.
  • Implemented a four-tier color-coded warning system (red, orange, yellow, blue) corresponding to collision risk levels.

Main Results:

  • The developed strategy accurately calculates the time to avoid a collision.
  • Collision risk is effectively evaluated using the time-to-avoidance metric.
  • Field tests on the Hankou-Yichang Railway validated the system's capability to detect potential collisions and issue warnings.

Conclusions:

  • The proposed train collision early warning strategy demonstrates sufficient capability in identifying potential collisions.
  • The color-coded system provides clear, risk-based alerts for train operators.
  • This approach enhances railway safety by improving early warning mechanisms.