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Repeating unit of polyphthalamide. Polyphthalamide (aka.PPA, [1] High Performance Polyamide) is a subset of thermoplastic synthetic resins in the polyamide family defined as when 55% or more moles of the carboxylic acid portion of the repeating unit in the polymer chain is composed of a combination of terephthalic (TPA) and isophthalic (IPA) acids. [2]
Under EO 172, facilities in the Batangas International Port and the Port of Subic Bay, and specifically the Subic Bay Freeport—to be identified by the Philippine Ports Authority (PPA) and the Subic Bay Metropolitan Authority (SBMA) – shall be deemed extensions of the Port of Manila, upon declaration by the Transportation Secretary of the ...
Poly(phthalaldehyde), abbreviated as PPA, is a metastable stimuli-responsive polymer first synthesized in 1967. [1] It has garnered significant attention during the past couple of years due to its ease of synthesis and outstanding transient and mechanical properties. [2]
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
The class, designed with a high level of modularity and automation, is going to be delivered in a full, a light+ and a light configuration in terms of different sensors and equipment embarked and can perform multiple functions, ranging from patrol with sea rescue capacity to civil protection operations and, in its most highly equipped version, first line fighting vessel.
A power purchase agreement (PPA), or electricity power agreement, is a long-term contract between an electricity generator and a customer, usually a utility, government or company. [1] [2] PPAs may last anywhere between 5 and 20 years, during which time the power purchaser buys energy at a pre-negotiated price.
Public Policy and Administration, an academic journal on public administration, often abbreviated as PPA; Paraguayan People's Army, a group considered a terrorist organization by the Paraguayan state; Parti du Peuple Algerien, an Algerian political party; Philadelphia Parking Authority, a parking agency in Pennsylvania, United States
10 kPa 1.5 psi Pressure increase per meter of a water column [26]: 10 kPa 1.5 psi Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed]