Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

2.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
2.2K
Bus Impedance Matrix01:24

Bus Impedance Matrix

622
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
622
Introduction to Vertical Curves01:24

Introduction to Vertical Curves

883
Vertical curves are parabolic transitions that connect different grades on highways and railroads, ensuring a smooth alignment between back and forward tangents. The back tangent represents the initial grade, while the forward tangent defines the subsequent grade. These curves can be symmetrical, with equal tangent lengths, or nonsymmetrical, with varying lengths. The key points defining a vertical curve include the Point of Vertical Intersection (P.V.I.), where the tangents meet; the Point of...
883
Vertical Curve: Problem Solving01:23

Vertical Curve: Problem Solving

680
Vertical curves provide the transition between two roadway grades, ensuring safety, comfort, and functionality. Calculating elevations at specific stations along the curve involves several systematic steps based on the curve's geometry and provided design parameters.The vertical curve is defined by its length, grades, Point of Vertical Intersection (P.V.I.) location, and P.V.I. elevation. The stations of the Point of Vertical Curvature (P.V.C.), where the curve begins, and the Point of Vertical...
680
Elevation of Intermediate Points on Vertical Curves01:20

Elevation of Intermediate Points on Vertical Curves

404
Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
404
Sight Distance in a Vertical Curve01:29

Sight Distance in a Vertical Curve

558
Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
558

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

LUNG group 2 innate lymphoid cells as a new adjuvant target to enhance intranasal vaccine efficacy against influenza.

Clinical & translational immunology·2022
Same author

The Interleukin-33-Group 2 Innate Lymphoid Cell Axis Represents a Potential Adjuvant Target To Increase the Cross-Protective Efficacy of Influenza Vaccine.

Journal of virology·2021
Same author

Detrimental impact of allergic airway disease on live attenuated influenza vaccine.

Health science reports·2021
Same author

A Triple-challenge Mouse Model of Allergic Airway Disease, Primary Influenza Infection, and Secondary Bacterial Infection.

Bio-protocol·2021
Same author

Impact of Pre-Existing Immunity to Influenza on Live-Attenuated Influenza Vaccine (LAIV) Immunogenicity.

Vaccines·2020
Same author

Impact of Pre-Existing Immunity on Live Attenuated Influenza Vaccine-Induced Cross-Protective Immunity.

Vaccines·2020

Video Experimental Relacionado

Updated: May 5, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

7.8K

Microplacas contra-rotativas en la triple unión de las Galápagos.

Emily M Klein1, Deborah K Smith, Clare M Williams

  • 1Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708-0227, USA. ek4@duke.edu

Nature
|February 25, 2005
PubMed
Resumen

Una nueva grieta al este de la elevación del Pacífico Oriental revela dos microplacas contra-rotativas en la triple unión de las Galápagos. Este descubrimiento redefine nuestra comprensión del movimiento de las placas tectónicas en la región.

Más Videos Relacionados

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
11:41

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation

Published on: February 1, 2020

18.1K
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

3.7K

Videos de Experimentos Relacionados

Last Updated: May 5, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

7.8K
Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
11:41

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation

Published on: February 1, 2020

18.1K
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

3.7K

Área de la Ciencia:

  • La geofísica es la geofísica.
  • La tectónica de placas es la tectónica de placas.
  • Geología marina Geología marina.

Sus antecedentes:

  • La microplaca de Galápagos es una característica clave en el Pacífico ecuatorial oriental.
  • Anteriormente se identificó un centro de propagación "incipiente" como su límite norte.
  • Se pensó que este centro de propagación era una grieta que se propagaba lentamente hacia el oeste, divergiendo lentamente.

Objetivo del estudio:

  • Investigar toda la extensión y el movimiento del centro de propagación "incipiente".
  • Para entender las complejas interacciones tectónicas en la triple unión de las Galápagos.
  • Para identificar y caracterizar microplacas adicionales en la región.

Principales métodos:

  • Análisis de datos batimétricos para identificar las características de extensión del fondo marino.
  • Modelado cinemático para determinar el movimiento de las microplacas en relación con las placas tectónicas principales.
  • Interpretación geofísica de la propagación y rotación de las grietas.

Principales resultados:

  • Pruebas presentadas para la ruptura hacia el este del centro de propagación "incipiente".
  • Identificación de una segunda microplaca giratoria en sentido contrario a las agujas del reloj al norte de la microplaca de Galápagos.
  • La triple unión de las Galápagos se caracteriza por dos microplacas contra-rotativas separadas por la grieta Hess Deep.

Conclusiones:

  • La "fisura incipiente" se abre en sentido contrario a las agujas del reloj, limitando una segunda microplaca.
  • La triple unión de las Galápagos involucra dos microplacas que giran en sentido contrario.
  • El movimiento de las microplacas puede modelarse como bloques rígidos impulsados por el arrastre de los bordes.