secondary fragment

secondary fragment

[′sek·ən‚der·ē ′frag·mənt]
(ordnance)
Secondary fragmentation resulting from either breakup of controlled or uncontrolled fragments upon impact or from the creation of fragments from the target material when it is impacted by a projectile; an example is the spalling of armor plate when it is pierced by armor-piercing shot; the fragments or spalls are broken off the back of the plate and become significant kill mechanisms within the armored enclosure.
References in periodicals archive ?
"We've been shooting insulating foam, ablator [heat shield], and ice materials at elements of the space shuttle thermal protection system as well as performing impacts against insulating foam to look at secondary fragment generation," says Walker.
Only centrally located cTnT peptides could be detected in the secondary fragment. Interestingly, in these samples, a double peak was observed in the extracted ion chromatogram (XIC) of the [sup.187]ALSN ...
Enhanced selectivity can be achieved by the use of quadrupole-ion trap tandem mass spectrometers that allow multistage fragmentation ([MRM.sup.3]), in which primary fragment ions, created by collision-induced dissociation, can be isolated and then further fragmented into secondary fragment ions for quantification.
Critical assay parameters include choice of highest-intensity fragment ions, peptide elution time during chromatography separation, and choice of secondary fragment ions useful for specificity confirmation.
More important, Kessler and Cour-Palais also pointed to a serious risk that would arise if the number of objects in low or medium Earth orbits became too high: A higher density of objects, they argued, makes it more likely that the secondary fragments created in one collision will in turn strike other objects.
Also, the fact that secondary fragments are formed in heparin plasma of patients with AMI suggests that, in addition to thrombin, other serum proteases maybe contributing to cTnT degradation following AMI.
The richness obtained in this study (between 13 and 384 species) was within the range observed for samplings in secondary fragments of Seasonal Semideciduous Forests (Gaspar, Castro, Peloso, Souza, & Martins, 2014).
Explosions result in four different types of injury which comprise primary injury (overpressure or implosion injury as a result of blast wave), secondary injury (caused by projectiles from primary bomb fragments or secondary fragments), tertiary injury (caused by whole body translocation due to blast wave energy) and quaternary blast injury (due to fire and heat generated from explosion)7.
Under severe blast conditions, such as an improvised explosive device, these bolts can break off, causing secondary fragments which may hit the vehicle and crew.
The MBR 300 is claimed to contain and protect against all lethal threats posed by the detonation of an improvised explosive device (IED); namely, primary fragments, secondary fragments, mechanical effects (shock/blast pressure) and thermal effects (contact and radiation burn) from the fireball, afterburn and resultant post-blast fires.
It is suggested that, in Splintered Urbanism, architecture, 'will rest less on Le Corbusier's dictum "the magnificent, skilful art of pure volumes bathed in light" (sic) than on the organization of programmes and process; in a city which depends equally on the programmatic activation of its voids as much as the maintenance of its built volume; a city represented by an architecture that is less and less material; and architecture that is primarily process and secondary fragments'.