The reciprocal time computer was tested by applying voltage signals of known input slopes to the voltage interval sensor (Figure 1) to simulate outputs of typical reaction monitorsignal modifier systems. T able I shows the results of measurements of input rates from 5 mV/sec to 20 V/sec. The instrument was calibrated with a 50 mV/sec input rate by adjusting Pi (Figure 3) to give the desired readout. This adjustment is

With the aid of computer techniques, including a laboratory automation system, accurate computer simulation, and an accurate calculation method, the EPR spectrum of copper doped in zinc fluoride has been analyzed. The observed g values led by a new method to a determination of the coefficients of the Kramer's doublet. Copper hyperfine structure verified these values and fluorine transferred hyperfine structure gave a measure of covalency. The fractional orbital occupation showed predominantly σ bonding which is similar to other reported transition metal ions in ionic insulating crystals. Orbital reduction, though no doubt present, makes only an insignificant and undetectable contribution.

When a spectrum is composed of a superposition of lines with known shape and uniform width, the sl.gnal output of a spectro~eter may be transformed into a spectrum whose effective resolution is sigm~cantl~ Improved .. If the lme shap~s are not precisely known or the linewidths not exactly uniform, it is still po~slble to ~chleve a. worthwhile r~solutlOn enhancement. Decomposition and analysis of complex spectra IS often ruded by this transformation. The theory of filters which produce the desired transformation is developed. Digital and analog implementation for these filters is given as well as several examples.

For a single d electron in a trigonal environment, the complete ligand-field Hamiltonian, including the interactions with the upper states of the cubic splitting, has been diagonalized in order to re-examine critically the theory of the EPR spectra of various Ti3+ compounds. The compounds for which there are adequate experimental data to justify a detailed discussion of the parametric theory of the electronic structure are titanium in corundum, cesium titanium alum, titanium acetylacetonate, and titanium-doped aluminum trichloride. Only for the first of these is it possible to fit the magnetic properties with crystal-field parameters. In each of the others, covalency is qualitatively indicated, but it is not possible from the present experimental data to give good numerical values either for the trigonal components of the effective potential or for the parameters describing covalency. We suspect that similar uncertainty exists in many of the published interpretations of iron-group compounds.

The Vatican Library is an extraordinary repository of rare bool(S and manuscripts. Among its 150000 manuscripts are eariy copies of worl(s by Aristotie, Dante, Euciid, Homer, and Virgii. Yet today access to the Library is iimited. Because of the time and cost required to travel to Rome, oniy some 2000 scholars can afford to visit the Library each year. Through the Vatican Library Project, we are exploring the practicality of providing digital library services that extend access to portions of the Library's collections to scholars worldwide, as an early example of providing digital library services that extend and complement traditional library services. A core goal of the project is to provide access via the Internet to some of the Library's most valuable manuscripts, printed books, and other sources to a scholarly community around the world. A multinational, multidisciplinary team is addressing the technical challenges raised by that goal, including • Development of a multiserver system suitable for providing information to scholars worldwide. • Capture of images of the materials with faithful color and sufficient detail to support scholarly study. • Protection of the on-line materials, especially images, from misappropriation. • Development of tools to enable scholars to locate desired materials. • Development of tools to enable scholars to scrutinize images of manuscripts.In this paper, we provide an overview of the project, a description of the system being developed to satisfy its needs, and a discussion of how the technical challenges are being addressed.