OSAC Lexicon

possible cause for observations, generated in an investigative interpretation
 

A material with a pressure ratio (maximum pressure/pressure at ignition, in absolute units) equal to or greater than 2.0 in any test when tested using the explosibility or Go/No-Go screening test described in Section 13 of ASTM E1226, Standard Test Method for Explosibility of Dust Clouds. [68, 2018]

The sudden conversion of potential energy (chemical or mechanical) into kinetic energy with the production and release of gases under pressure, or the release of gas under pressure. These high-pressure gases then do mechanical work such as moving, changing, or shattering nearby materials.

Study of how chemistry, physics, fire science, engineering disciplines of fluid and solid mechanics, and heat transfer interact to influence explosion behavior.

Study of how chemistry, physics, fire science, engineering disciplines of fluid and solid mechanics, and heat transfer interact to influence explosion behavior.

Any chemical compound, mixture, or device that functions by explosion.

Any material that can act as fuel for an explosion.

The side of a structural assembly or object that is directly exposed to the fire.

The parameter, associated with the assessment method used, that characterizes the dispersion of the values that could reasonably be attributed to the measurand.

Studies the projectile’s movement between the muzzle and the target(s).

Writing conditions such as underlying writing surface, substrate, writing implement, writing position, interruptions during the writing activity etc. that affect the handwriting movement or the resulting writing. (NIST HF)

Physical assessment of the decedent by a medicolegal death investigator.

Diagnostic medical procedure conducted by a pathologist or other specially trained medical personnel that consists of physical inspection of the decedent without internal examination; can include ancillary tests.

condition when an anisotropic substance ap- pears dark when observed between crossed polarizers and occurs when the vibration directions of the specimen are parallel to the vibration directions of the polarizer and analyzer.

A procedure where the reinforcement of a previously reinforced behavior is discontinued with the intention to reduce the occurrence of that behavior

a type of extinction in which the vibration directions are inclined at an angle relative to a crystal face.

a type of extinction in which the vibration directions are parallel to the crystal faces.

a type of extinction in which the vibration directions bisect a prominent interfacial angle of the crystal.

To cause to cease burning.

Total cellular DNA isolated from a biological sample to include nuclear and mitochondrial DNA.

Often found in cursive writing, a small oval or loop formation.

An inked ribbon wherein the substrate is a woven cloth material, such as nylon, cotton, or silk.

A falsely manufactured document. NOTE A counterfeit document is an attempt to create an exact copy of a document that exists (e.g., trying to recreate the US passport including all security features). A fabricated document is completely fictitious (e.g., creating a passport from a country that is fictitious). A forged document alters or changes a genuine document (e.g., altering the photo, name, or date on an existing passport).

An investigative technique combining anatomical knowledge, artistic capability, and forensic anthropological evidence to render an estimate of an individual’s facial appearance in life.

An investigative technique combining anatomical knowledge, artistic capability, and forensic anthropological evidence to render an estimate of an individual’s facial appearance in life.