State machine stability

The stability of the state machine. Designing die circuit so that bad (unused) states are avoided and ensuring that the state of the machine can be recovered. This could mean that the circuit must be reinitialized manually or all bad states automatically recover themselves and return to a known state. 

In order to perform controlled and reversible movements and to behave as a machine, the envisaged molecular system should have a mobile and a fixed component one of the components should be redox active and the oxidized and reduced states should have almost comparable stability and should be connected by a reversible, and possibly fast, electron transfer process. The two oxidation states should display a different topological affinity with respect to the other component, so that a redox change can induce a modification of the topology of the whole molecular system, generating an intramolecular motion. The occurrence of fast and reversible movements also requires that the interaction between the mobile and the fixed part is based on... 

In the same way that steady state stability was assessed by concentrating on the variations of the rotor angle Sg, so also is the limit of transient stability assessed. However, the situation is not so exact. The transient variation of Sg for any one machine can exceed 90 degrees, and even reach 120 degrees, before unstable operation occurs. The limit of transient stability can therefore exceed 90 degrees and is influenced by several factors ... 

It can now be predicted with confidence that machine calculations will lead gradually toward a really fundamental quantitative understanding of the rules of valence and the exceptions to these toward a real understanding of the dimensions and detailed structures, force constants, dipole moments, ionization potentitils, and other properties of stable molecules and equally unstable radicals, anions, and cations, and chemical reaction intermediates toward a basic understanding of activated states in chemical reactions, and of triplet and other excited states which are important in combustion and explosion processes and in photochemistry and in radiation chemistry and also of intermolecular forces further, of the structure and stability of metals and other solids of those parts of molecular wave functions which are important in nuclear magnetic resonance, nuclear quadrupole coupling, and other interaction involving electrons and nuclei and of very many other aspects of the structure of matter which are now understood only qualitatively or semi-empirically. 

Metropohs N, Rosenbluth AW, Rosenbluth MN, TeUer AH, Teller E (1953) Eqrration of state calculations by fast computing machines. J Chem Phys 21 1087-1092 Milman V, Winkler B, White JA, Pickard CJ, Payne MC, Akhmatskaya EV, Nobes RH (2000) Electronic structirre, properties, and phase stability of inorganic crystals A pseudopotential plane-wave study. Int J Quantirm Chem 77 895-910... 

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