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INITIAL WAVE [6 records]

Record 1 2026-01-08

English

Subject field(s)
  • Weapon Systems
  • Demolition (Military)
DEF

An initial charge which transmits the detonation wave to the whole of the charge.

OBS

priming charge: term and definition standardized by NATO.

French

Domaine(s)
  • Systèmes d'armes
  • Destruction (Militaire)
DEF

Charge élémentaire destinée à transmettre la détonation à l'ensemble de la charge.

OBS

charge d'amorçage : terme et définition normalisés par l'OTAN.

Spanish

Campo(s) temático(s)
  • Sistemas de armas
  • Destrucción (Militar)
DEF

Carga inicial que transmite la onda de detonación al resto del explosivo.

Save record 1

Record 2 2003-12-10

English

Subject field(s)
  • Combustion and Fuels (Fireplaces)
  • Heat (Physics)
CONT

A certain class of ceramic and metallic materials can be manufactured by the self-propagating high-temperature synthesis method. Even though by now this process has included reaction systems of the solid-gas and solid-liquid types, the original work was directed towards the reactions investigated where not only the reactants but also the final products formed in the solid phase. These reactions are therefore generally referred to as gasless, solid-solid or condensed phase combustion reactions.

CONT

Condensed phase combustion is a complex phenomenon of theoretical and practical interest, in particular, as a method to synthesize materials. This combustion synthesis process involves a self-sustained combustion wave which propagates through initial reactants converting them into a desired product. In condensed phase combustion the initial reactants as well as final, and possibly intermediate products, remain in the condensed phase throughout the reaction. Though the combustion process occurs in a heterogeneous medium composed of reactive particles, typical models of condensed phase combustion treat the medium as homogeneous.

CONT

A deflagration analysis of porous energetic materials with two-phase flow and a multiphase sequential reaction mechanism. ... A theoretical analysis for the unconfined deflagration of a porous energetic material is developed for a two-step global reaction mechanism that consists of the condensed-phase combustion of the reactive material to produce gas-phase intermediates, followed by a gas-phase reaction that produces final gas-phase products.

OBS

Combustion is a chemical reaction, it gives off heat and is self-sustaining. It can occur in a condensed-phase (glowing), a gas-phase (flame) or both. Fire results when a combustible material (fuel) in the presence of an oxidizing agent (oxygen) is heated to a critical temperature (ignition temperature).

French

Domaine(s)
  • Combustion et combustibles (Foyers)
  • Chaleur (Physique)
CONT

Synthèse auto-propagée à haute température. La synthèse auto-propagée est un processus de combustion en phase condensée (en anglais «SHS» - «self-propagating high temperature synthesis») développé pour produire des céramiques et des matériaux refractaires.

OBS

état condensé : État de la matière dans lequel les atomes du corps sont très proches les uns des autres. (Les états solide et liquide sont des états condensés).

Spanish

Save record 2

Record 3 2002-06-04

English

Subject field(s)
  • Fires and Explosions
OBS

Whereas an earthquake provides a complicated assortment of seismic waves because of the large area of geologic movement involved, explosions provide relatively simple signature : those explosions are usually of higher frequency and shorter duration and the initial P-type body wave tends to be larger than that caused by an earthquake; it is relatively easy to distinguish between earthquakes and explosions of large magnitude.

French

Domaine(s)
  • Feux et explosions
OBS

Reproduit du lexique «Disarmament and Peace Keeping/Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Spanish

Save record 3

Record 4 1998-06-10

English

Subject field(s)
  • Symptoms (Medicine)
  • The Heart
DEF

A double beating pulse characterized by two impulses occurring during systole. The initial upstroke rises rapidly and is referred to as the percussion wave. This is followed by a small dip and then a second slower upstroke called the tidal wave. This type of pulse is found in combined aortic regurgitation and stenosis.

OBS

The term "bisferiens pulse" was recommended by the Medical Signs and Symptoms Committee.

French

Domaine(s)
  • Symptômes (Médecine)
  • Cœur

Spanish

Save record 4

Record 5 1991-05-14

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 5

Record 6 1986-05-15

English

Subject field(s)
  • Building Insulation and Acoustical Design
  • Acoustics (Physics)
DEF

A region immediately behind an object placed in the path of a sound wave whose wavelength is much smaller than the object, in which the initial sound wave is cut off by the object and the sound intensity is determined by the diffraction and interference of sound waves bent around the obstacle.

French

Domaine(s)
  • Isolation et acoustique architecturale
  • Acoustique (Physique)
CONT

Lorsqu'un son frappe une surface et qu'il se réfléchit, il se produit (...) un phénomène d'écho. (...) De l'autre côté de la surface réfléchissante, il peut se produire une véritable "ombre" acoustique; un auditeur qui se trouve séparé d'une source sonore par un obstacle peut donc ne pas entendre cette source si l'obstacle est assez grand (...)

CONT

(...) les méthodes de tracés de rayons acoustiques (...) permettraient d'appréhender la distribution de l'énergie sonore dans les salles et ainsi d'éviter l'existence de zones de focalisation, d'ombres acoustiques ou d'échos multiples (...)

Spanish

Save record 6

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