Application of the numerical integration method to a study of the “proximity effect” in radiationless transitions of n-heterocyclics

The numerical integration method is applied to the “proximity effect” in

transitions of N-heterocyclics The results are similar to those given by the quantum statistical mechanical (QSM) method and show that vibronically active out-of-plane bending modes may be the dominant accepting modes. An advantage which this method may have over QSM is pointed out.     

Stereospecific polymerization of methacrylonitrile. IV. Polymerization by ate complex-type catalysts

Methacrylonitrile was polymerized by a number of ate-complex catalysts. The catalysts used were NaAlR₄, LiAlR₄, LiZnR₃, Li₂ZnR₄, RMg[AlR₄], and Mg[AlR₄]₂. It was found that the ate-complex catalysts in which one of the alkyls is replaced by a diphenylamino group are capable of producing polymers with higher degrees of crystallinity than those of polymers obtained by unmodified catalysts. It was shown that the diphenylamide linkage in these catalytic systems must play an important role in the steric control in the propagation steps of this type of polymerization, although the mechanism is not clear at present. The crystallinity index used in this research gave a linear relation against I measured by NMR, and can be used as a measure of the stereo-regularity of the polymer.     

Positive working photoresists sensitive to visible light,II: poly{2-arylpropyl-2 and bis(p-methoxyphenyl)methyl methacrylates}

Acid-labile polymers of methacrylates of 2-(p-substituted phenyl)propanol-2 and bis(p-methoxyphenyl)methanol were evaluated as visible light sensitive positive-type resists. The chemistry to form images is based on the cleavage of esters catalysed by an acid generated by photodecomposition of diphenyliodonium hexafluorophosphate sensitized by 2-benzoyl-3-(p-dimethylaminophenyl)-2-propenenitrile. A copolymer of bis(p-methoxyphenyl)methyl methacrylate-phenyl methacrylate exhibited a high photospeed upon exposure to 488 nm light when coupled with the iodonium salt and the dye, and was applicable to relief holography.     

The alignment of nematic liquid crystals on photolithographic micro-groove patterns

The alignment of nematic liquid crystals on micro-groove patterns was studied. It has been found that the order of the alignments is determined by the edge shape, spacing, and line pitch of the micro-groove patterns. On coarse patterns, with pitches greater than 2 μm, striped patterns of the liquid crystal alignment were observed using polarized light which manifested different orientations of the liquid crystals on the top, edge, and bottom of the grooves, respectively. On fine patterns, with pitches less than 2 μm, a uniform device-quality alignment has been realized, with which twisted nematic cells were constructed in combination with the rubbed alignment layer on the opposite substrate. Their viewing angle characteristics and tilt orientations of the director were also investigated.     

Minimal subschemes of the group association schemes of Mathieu groups

Minimal subschemes of the group association schemes of Mathieu groupsM _n (n = 11, 12, 22, 23, 24) are determined. It is proved that for eachM _n (n = 11, 12, 22, 23, 24), there is a unique minimal subscheme of. The class numbers of these minimal subschemes are 7, 11, 9, 11 and 20 respectively. A general computer program to determine subschemes of group association schemes of relatively small class numbers is discussd.     

‘Effective hot reaction zone’, caging energy and normalized appearance energy in ruthenium complexes

In contrast to the single molecule cage of Ru/acac/₃ a cage involving wall molecules of RuCp₂ is formed in recoil reaction of radioruthenium atoms. Enhancement of the parent yield in RuCp₂ is ascribed to the larger size of the cage /effective hot reaction zone/ compared to the case of Ru/acac/₃. A normalized appearance energy technique has been applied to estimate energy /AE _adj ^x / necessary for caging the recoil atom in RuCp₂. AE _adj ^x is about twice as large as caging energy CE. The relation of AE _adj ^x to CE in RuCp₂ is nearly the same as that of AE^x to bonding energy BE in Ru/acac/₃.     

Agelasine-E and -F,novel monocyclic diterpenoids with 9-methyladeninium unit possessing inhibitory effects on Na,K-ATPase isolated from the Okinawan sea sponge Agelas nakamurai Hoshino

Agelasine-E and -F, novel terpenoids with a 9-methyladeninium unit have been isolated from the orange colored sea sponge $\text{Agelas nakamurai}$ Hoshino as Na,k-ATPase inhibitors and their structures and absolute configurations have been determined on the basis of spectral data and chemical conversions.     

Transverse plasmon in two-dimensional electrons

We calculated the retarded transverse current-current response function of an ideal two-dimensional electron gas and obtained a dispersion relation for the transverse plasmon in the system.     

A Remark on <Emphasis Type="Italic">L</Emphasis><Superscript>∞</Superscript> Solutions to the 2-D Navier–Stokes Equations

A single-exponential growth estimate of the solutions to the 2-dimensional Navier–Stokes equations in the whole space for nondecaying initial velocity is established. The crucial idea is to decompose velocity into high and low frequency parts. Moreover, if the linear term and the vorticity decay exponentially, the velocity is bounded uniformly in time.