The interaction of chloride ion with cationic-coated silver surface-enhanced Raman scattering (SERS) substrates was monitored using a competitive complexation technique. In this approach, the nitrate concentration is kept constant and the chloride ion concentration is varied. The change in the nitrate peak area, Delta A(NO3), is measured as a function of chloride ion concentration, Gel. The measured response is described by the following relationship: Delta A(NO3) = VCCl/(K + C-Cl). Using the value of K and the value of the ion-pair constant between the cationic coatings and nitrate ion, it is possible to extract the value of the ion-pair constant for chloride ion. The selectivities of the cationic coatings for nitrate, sulfate, and chloride ions are discussed.

Evidence for tritium production in the Pd/D system under cathodic polarization is presented. A comparison of the observed distribution and that calculated, based on the conservation of mass, leads to the conclusion that tritium is produced sporadically at an estimated rate of similar to 10(3) to 10(4) atom/s. The results of several runs are interpreted by employing the concept of an electrode/electrolyte interphase and the accepted kinetics of hydrogen evolution. Burstlike events followed by longer periods of inactivity yield poor reproducibility when distributions are averaged over the total time of electrolysis.

Results of synthesis of stoichiometric, superconducting K3C60 and Rb3C60 by precipitation from liquid ammonia are described. The material was studied by means of X-ray diffraction and magnetic susceptibility measurements. The superconducting phases reproduced from this synthesis, without recourse to high temperature anneal, have properties consistent with those of vapor doped materials. The observed magnetic properties are interpreted in terms of the grain size and the links between the grains.

Expressions are given for the tritium distribution between gas and liquid phases arising from prolonged electrolysis of D2O on Pd electrodes saturated with absorbed deuterium. Errors associated with commonly employed experimental procedures and their interpretation using a simple model for the distribution between the gas and liquid phases are evaluated. With regard to tritium production, an unambiguous resolution requires a complete mass balance. Conclusions based on partial data, such as the measurement of the tritium content in a single cell component (e.g. electrode, electrolyte or ''electrolytic'' gas phase), may be misleading, particularly if production rates are either low or intermittent.

A method for generating a set of archetypes that are used to classify ranges and domains in an iterated transformation image compression encoder is presented. Fidelity versus encoding time data are presented, and compared with a more conventional classification scheme. The results indicate that for intermediate encoding times, both fidelity and encoding speed can be improved by using archetype classification.

Up to 30 weight-percent silver has been added, in the form of silver peroxide, prior to the final sintering step in the preparation of the high-Tc superconductor Bi2Sr2CaCu2O8. The sintered samples were characterized by optical microscopy and image analysis energy-dispersive X-ray analysis, and X-ray diffraction. Intergranular and intragranular critical current densities were measured by transport and magnetization techniques, respectively. Under the sintering conditions used, there is no evidence of silver inclusion in the lattice, nor of any effect on the stoichiometry due to the silver additions. The silver does have a large effect, though on the sample morphology, and, therefore, on the intergranular critical current density. However, only a modest variation of the intragranular critical current density is observed with added silver.

This paper presents results from an image compression scheme based on iterated transforms. Results are examined as a function of several encoding parameters including maximum allowed scale factor, number of domains, resolution of scale and offset values, minimum range size, and target fidelity. The performance of the algorithm, evaluated by means of fidelity versus the amount of compression, is compared with an adaptive discrete cosine transform image compression method over a wide range of compressions.

A review of iterated transformation image compression is presented. Generalization of simple iterated function system fractal generating algorithms to an automated iterated transformation algorithm used to compress gray-scale images is reviewed. Compressed images from the Digital Terrain Elevation Database (DTED) are presented and are compared with encodings using adaptive discrete cosine transformations and mean residual vector quantization image compression techniques

: Perform chemical modifications to existing materials that may enhance their superconducting properties and provide insight into the mechanisms responsible for high-temperature superconductivity. This report presented a review of high-temperature superconductivity. An overview of superconductivity from its original discovery to the present is also given. Synthesized two sets of samples. One set was based on the structure Bi2Sr2CaCu2O8 and the other on Bi2-Sr2Ca2Cu3O10. In both cases, the copper was partially replaced with elements from the first transition row of elements. The replacement was at the level of 5 mol.-% of the transition element for copper. The transition elements used were vanadium (V), manganese (Mn), titanium (Ti), nickel (Ni), zinc (Zn), cobalt (Co) , and iron (Fe) and determined the effect of the substitutions on the crystal structure.

: A new classification technique based on archetypes can reduce encoding time and still maintain compression and fidelity. The use of different metrics has shown little differences in the final encoding quality thus implying that the use of the root mean square metric is preferred. Also presented are Digital Terrain Elevation Database (DTED) that are more accurate after using an iterated transform algorithm modified to encode the coastlines. The results compare favorably with an adaptive discrete cosine transformation (ADCT) and mean residual vector quantization algorithm. Additionally, results of two iterated transform algorithms for encoding 24-bit/pixel color images are presented. The first method transforms the red, green, blue (RGB) to the luminancechrominance representation before encoding, showing results similar to ADCT algorithms. The second method encodes RGB subimages directly using common transformations, and does not perform as consistently as the luminance- chrominance method. Digital Terrain Elevation Database (DTED), Archetypes, Image compression, Iterated transforms, Fractals.