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Logic Operations (logic + operations)
Selected AbstractsInnentitelbild: Sequential Logic Operations with Surface-Confined Polypyridyl Complexes Displaying Molecular Random Access Memory Features (Angew. Chem.ANGEWANDTE CHEMIE, Issue 1 20101/2010) Redoxaktive Monoschichten bilden die Grundlage eines Festkörperaufbaus, der in der Lage ist, die Ein-/Ausgabe-Charakteristika elektronischer Schaltkreise zu imitieren. M.,E. van,der,Boom et,al. zeigen in der Zuschrift auf S.,173,ff. sequenzielle Logikoperationen, die durch mehrfache chemische Eingaben gesteuert werden. Ein Schaltkreis entspricht dabei einem Set-Reset-Latch, einer der grundlegenden Komponenten eines Speichers mit wahlfreiem Zugriff (RAM). Die Art der Logik (kombinatorisch oder sequenziell) kann über den Stromzustand (statisch oder dynamisch) kontrolliert werden. [source] Sequential Logic Operations with Surface-Confined Polypyridyl Complexes Displaying Molecular Random Access Memory Features,ANGEWANDTE CHEMIE, Issue 1 2010Graham de, Ruiter Ein selektiver Speicher: Osmium(II)-basierte Monoschichten auf Glassubstraten eignen sich für die Erzeugung sequenzieller Logikschaltkreise mit Mehrfacheingabe, die eine RAM-Funktionalität in Form eines Set/Reset-Latch zeigen. Zudem kann die Art der angezeigten Logik, z.,B. sequenziell oder kombinatorisch, über den Stromzustand , statisch oder dynamisch , festgelegt werden. [source] All-Optical Integrated Logic Operations Based on Chemical Communication between Molecular SwitchesCHEMISTRY - A EUROPEAN JOURNAL, Issue 1 2009Serena Silvi Dr. Abstract Molecular logic gates process physical or chemical "inputs" to generate "outputs" based on a set of logical operators. We report the design and operation of a chemical ensemble in solution that behaves as integrated AND, OR, and XNOR gates with optical input and output signals. The ensemble is composed of a reversible merocyanine-type photoacid and a ruthenium polypyridine complex that functions as a pH-controlled three-state luminescent switch. The light-triggered release of protons from the photoacid is used to control the state of the transition-metal complex. Therefore, the two molecular switching devices communicate with one another through the exchange of ionic signals. By means of such a double (optical,chemical,optical) signal-transduction mechanism, inputs of violet light modulate a luminescence output in the red/far-red region of the visible spectrum. Nondestructive reading is guaranteed because the green light used for excitation in the photoluminescence experiments does not affect the state of the gate. The reset is thermally driven and, thus, does not involve the addition of chemicals and accumulation of byproducts. Owing to its reversibility and stability, this molecular device can afford many cycles of digital operation. [source] Molecular Logic Operations Based on Surfactant Nanoaggregates,CHEMPHYSCHEM, Issue 13 2008Junhong Qian Dr. Abstract Two molecular logic gates, FS1 and FS2, which display a UV and fluorescence behavior that is dependent on the pH value and the sodium dodecyl sulfate (SDS) surfactant concentration, are demonstrated based on the intramolecular charge-transfer mechanism. They are constructed according to the inorganic salts that induce transformation from premicelle to micelle. The absorption band of FS1 at 480 nm is significantly enhanced only when both SDS and Na2SO4 are the input at high concentrations, in accordance with an AND logic gate. The OR logic function can be realized in a 3.5,mM SDS/FS2 aqueous solution with SDS and Na2SO4 as inputs along with the emission intensity as output. Furthermore, half addition and half subtraction can be incorporated in FS1. This is facilitated by the surfactant, due to its versatility. [source] | ||||||||||