On (0,α)-Geometries and Dual Semipartial Geometries Fully Embedded in an Affine Space

The (0,α)-geometries fully embedded in a projective space are up to a few open cases classified. For (0,α)-geometries fully embedded in an affine space AG(n,q), less is known. The most important model is the so-called linear representation T _n-1* (k) of a set k of type {0,1,α +1} with respect to lines in the hyperplane at infinity. We will give a characterization of this model. We also investigate the case where the (0,α)-geometry, fully embedded in AG(n,q), is the dual of a semipartial geometry.     

Surface analysis of environmental samples

The surface chemical compositions of solid samples from environmental sources can differ from bulk or average compositions. The processes of adsorption, desorption, precipitation, dissolution, reaction etc., change the surface composition thereby affecting the surface chemistry. Accordingly, surface analytical information is important for the understanding of environmental chemistry involving solid surfaces. Analysis of environmental solid samples with their complex composition is a challenge to rapidly developing surface analytical techniques.     

Application of cyclic boundary conditions in the CNDO/2 calculation of SiO2 clusters

Preliminary studies on the possibility of eliminating the dangling bonds in a cluster model calculation by connecting the cluster into itself. The calculation was made on a SiO₂ cluster, using the CNDO/2 method.     

S-matrix,Feynman zigzag and Einstein correlation

An inherent binding between Einstein correlations and the S-matrix formalism entails full relativistic covariance, complete time symmetry, and spacelike connexions via Feynman zigzags. The relay is in the past for predictive correlations between future measurements, and in the future for retrodictive correlations between past preparations (Pflegor and Mandel).An analogy and a partial binding exist between intrinsic symmetry together with factlike asymmetry of (1) “blind statistical” prediction and retrodiction (retarded and advanced waves, information as cognizance and as will) and (2) positive and negative frequencies (particles and antiparticles). As advanced waves are required for completeness of expansions, “antiphysics” obeying blind statistical retrodiction should show up in appropriate contexts, “parapsychology” being submitted as one of them.     

A simple technique for holographic multiplexing

A technique for holographic multiplexing is proposed which utilizes a combination of theta modulation and carrier frequency multiplexing. Twenty two binary transparent object were multiplexed with this technique and a resolution of 10 lines/mm with good diffraction efficiency was obtained. The technique can be used for studying the sequential events at discrete time intervals.     

Characterizations of sums of dyads and of Kronecker products

This research was partially supported by Air Force Office of Scientific Research Grant 75-2858.     

A study of the charge-exchange reaction pp → nΔ++(1232) at ISR energies

We report on a study of the charge-exchange reaction pp → nΔ⁺⁺(1232) at the CERN intersecting storage rings (ISR) in the energy range √s = 23 to 53 GeV. From our analysis of the energy dependence of the total cross-section, of the differential cross-section dσ/dt and of the decay angular distributions we find evidence that pion exchange is dominant up to √s = 23 GeV and that (?+A₂) exchange dominates the reaction for √s ? 30 GeV, as described by simple Regge-pole models.     

Giant resonances in f-p shell nuclei studied by inelastic scattering of 80 MeV 3He ions

Spectra of ⁴⁸Ti, ⁵⁶Fe, ⁵⁹Co and ⁶⁰Ni have been investigated for excitation energies of 10–20 MeV by inelastic scattering of 80 MeV ³He particles. Broad peaks with excitation energies of about $\text{63±1 A}{}^{\mathrm{<mtext>?</mtext><mtext>1</mtext><mtext>3</mtext>}}\text{MeV}$ and FWHM of 6 MeV have been observed. Much narrower satellite peaks occur at excitation energies about $\text{51±1 A}{}^{\mathrm{<mtext>?</mtext><mtext>1</mtext><mtext>3</mtext>}}\text{MeV}$. The angular distributions of the sum of these peaks were compared to extended optical model DWBA calculations which confirm the predominant L = 2 character of the GR. A tentative assignment of L = 2 or 4 was made for the 13.5 MeV satellite peak in ⁵⁶Fe. We see no definite evidence for the presence of an L = 1 GR component.