Neutron structure function and deuteron EMC effect

Using the impulse approximation, a relativistic formalism for the deuteron structure function is given in the conventional nuclear model. The nucleon density distribution function is obtained by combining the Blankenbecler-Cook vertex factor with the Buck-Gross deuteron wave function. A new procedure is developed to extract the neutron structure function from empirical data on proton and deuteron targets. The results are used to evaluate the deuteron EMC effects in the conventional nuclear model.     

Parameter estimation of an autoregressive moving average model

Summary An estimator of the set of parameters of an autoregressive moving average model is obtained by applying the method of least squares to the log smoothed periodogram. It is shown to be asymptotically efficient and normally distributed under the normality and the circular condition of the generating process. A computational procedure is constructed by the Newton-Raphson method. Several computer simulation results are given to demonstrate the usefulness of the present procedure.     

Synthesis of labda-8(17),13(14)-diene-15,16-olide and 15,16-epoxy-labda-8(17),13(16)-14-triene and their rearrangement to clerodane derivatives

The title compounds 1b and 1c were synthesized from manool. On treatment with either trifluoroacetic acid or formic acid 1b provided in nearly 100% yield 4a with a rearranged labdane skeleton. With sulfuric acid, however, 1b gave solely Δ^8,9-isomer 5. Reduction of 4a with lithium diisobutylaluminum hydride afforded 4b. On treatment with sulfuric acid 4a reverted to 5. Rearrangement of the epoxide 6 with boron trifluoride- etherate led to a complex product mixture from which no pure substance was obtained.     

Properties of optical beat signals passing through a random diffuser

Optical second-harmonic generation has been measured in some organic liquids in presence of an electric field. Our preliminary results on the molecular hyperpolarizabilities of eleven benzene derivatives and a disubstituted stilbene are presented. These data show that the magnitude and sign of the π-electron contribution to the quadratic polarizabilities are strongly correlated with the mesomeric effect of the substituent and increase drastically with the size of the aromatic system.