Sum rules and constraints on passive systems

Sum Rules and Positivity Constraints on Nucleon Spin Structure

Abstract. The spin structure of nucleon at twist 2 and 3 levels is analyzed. The contribution of quark and gluon spins to nucleon spin are Lorentz invariant, while it is not sure for orbital angular momentum. The conserved fractional moments of transversity distribution are considered. The scenario of decoupled total angular momentum, determined predominantly by the unpolarized scattering, is d...

Constraints on Semileptonic Form - Factors Fromdispersive Sum Rules

I briefly discuss the derivation of dispersive sum rules constraining semileptonic form-factors. I outline the use of these constraints in the context of charmless semileptonic decays and suggest how, in combination with other theoretical and experimental information, they may reduce the uncertainties in the extraction of V ub .

On General Sum-Connectivity Index of Benzenoid Systems and Phenylenes

On rules and integrity constraints in database systems

Recently, several researchers have proposed incorporating rules into database systems. These rules typically embody several diverse concepts, eg. deductive rules, production rules, and authorisation rules. However, most systems treat these diverse concepts homogeneously. Their roles are often misunderstood because of this lack of distinction. This paper clarifies the concepts of deductive rules...

Rcd Rules and Power Systems Observability

Power system state estimation is a process to find the bus voltage magnitudes and phase angles at every bus based on a given measurement set. The state estimation convergency is related to the sufficiency of the measurement set. Observability analysis actually tests this kind of problem and guarantees the state estimation accuracy. A new and useful algorithm is proposed and applied in this pape...