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Synthesis of polydiacetylenes occurs through topochemical polymerization of 1,3-diynes. Typically, this must occur in the solid state, because many diynes undergo both 1,2 and 1,4 polymerization in solution – such is the case with diiodobutadiyne, [4] and other diynes with electron withdrawing substituents. The ideal arrangement of diynes in ...
Pathological demand avoidance (PDA), or extreme demand avoidance (EDA), is a proposed pervasive developmental disorder characterized by greater-than-typical refusal to comply with requests or expectations—demand avoidance—and extreme efforts to avoid social demands. [1]
The Palm TX. A personal digital assistant (PDA) is a multi-purpose mobile device which functions as a personal information manager. Following a boom in the 1990s and 2000s, PDAs were mostly displaced by the widespread adoption of more highly capable smartphones, in particular those based on iOS and Android in the late 2000s, and thus saw a rapid decline.
A Pocket PC (P/PC, PPC) is a class of personal digital assistant (PDA) that runs the Windows Mobile operating system, which is based on Windows CE/Windows Embedded Compact, and that has some of the abilities of modern desktop PCs. The name was introduced by Microsoft in 2000 as a rebranding of the Palm-size PC category and was marketed until 2007.
[11] [12] A stack automaton is called nonerasing if it never pops from the stack. The class of languages accepted by nondeterministic, nonerasing stack automata is NSPACE(n 2), which is a superset of the context-sensitive languages. [1] The class of languages accepted by deterministic, nonerasing stack automata is DSPACE(n⋅log(n)). [1]
The Palm TX from 2005 An early model—the PalmPilot Personal. Palm is a now discontinued line of personal digital assistants (PDAs) and mobile phones developed by California-based Palm, Inc., originally called Palm Computing, Inc. Palm devices are often remembered as "the first wildly popular handheld computers," responsible for ushering in the smartphone era.
Patent ductus arteriosus (PDA) is a medical condition in which the ductus arteriosus fails to close after birth: this allows a portion of oxygenated blood from the left heart to flow back to the lungs from the aorta, which has a higher blood pressure, to the pulmonary artery, which has a lower blood pressure.
In the coronary circulation, the posterior descending artery (PDA), also called the posterior interventricular artery (PIV, PIA, or PIVA), is an artery running in the posterior interventricular sulcus to the apex of the heart where it meets with the left anterior descending artery also known as the anterior interventricular artery.