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Y.Ba2Cu3O7, a high TC superconductor powder, was shock compacted and explosively welded inside a copper matrix using the explosive fabrication methods described by Murr, Hare and Eror. The shock compression fabrication technique provides the ability to process the superconductor powders into useable structures that will minimize environmental degradation and will not negatively affect the physical or mechanical properties. Additionally, the introduction of shock induced defects are known to increase solid-state reactivity in ceramic materials. For this reason, shock compression fabrication of the superconductor/copper system offers the possibility of enhancing the superconducting properties of the YBa2Cu3O7 powders.
NMR data are presented for reactively sputtered amorphous silicon-hydrogen alloys (a-Si(H)). Measured differences in two of the samples are attributed to two distinct morphologies: a mixed phase (monohydride and dihydride) and a purely monohydride composition. Features of the mixed phase morphology have been modeled. Room temperature, 35 MHz spin-lattice relaxation times are presented for a series of monohydride samples prepared with systematically varied sputtering parameters. A correlation of proton T1 with the density of ESR states tentatively is suggested.
A preliminary analysis of New Caledonian Araliaceae has shown varying degrees of support for previous hypotheses on sexual system evolution in the family. Andromonoecy, rather than hermaphroditism, is strongly supported as the ancestral sexual system for the Araliaceae. Derivation of hermaphroditism from andromonoecy in Delarbrea harmsii R. Vig. and Polyscias bracteata (R. Vig.) Lowry, ined. is also strongly supported. Support for the derivation of dioecy from andromonoecy in several New Caledonian species of Polyscias J. R. Forst. & G. Forst. depends in part on an assumption that andromonoecy cannot be secondarily derived from dioecy. The derivation of hermaphroditism from andromonoecy in Schefflera candelabra Baill. and S. pseudocandelabra R. Vig. is equivocal. The hypothesis that the immediate ancestors of Arthrophyllum Blume were andromonoecious is not supported.
Methods are described for the semiquantitative analysis of the
tissue components of human
peripheral nerve using light microscopy. General histological preservation
assessed using haematoxylin
and eosin staining and the distribution of collagen type IV was investigated
Several techniques were investigated to establish the one giving optimum
immunobinding and greatest contrast for image analysis. Frozen sections
unsuitable for this tissue and
paraffin wax sections were therefore used. Alcohol fixation was rejected
poor preservation of the
endoneurium, although immunobinding was excellent. Ice-cold formalin fixation
for 24 h was found to be
adequate for structural preservation and antibody binding, provided that
protease step was introduced.
Trypsin was found to be superior to pepsin for exposing collagen type IV
Of the detection systems
investigated indirect immunofluorescence was not suitable due to considerable
autofluorescence of the nerve.
The avidin-biotin method provided the greatest contrast, and was therefore
the detection method of choice
for image analysis. The optimum techniques for image analysis were then
on control human sural nerve
to ascertain the best comparative method for collagen type IV in the perineurium.
A method of
semiquantitative analysis is described which takes into account the fact
there is a close linear
relationship between collagen content per unit of perineurium and perineurial
perimeter as fascicle size
increases in peripheral nerve. This means that data from 2 different sample
groups can easily be compared,
provided that a range of fascicle sizes is analysed in each case.
The publication of the latest rating of doctoral programs by the National Research Council (NRC 1995) has sparked great interest among university faculties. For some, the results vindicated years of focused efforts to improve their department's capacity, performance, and image. For others, it generated frustration because of the small change in scores from previous NRC rankings. And for still others, the NRC report occasioned soul-searching or defensive rationalization, including complaints that the reputational rankings did not reflect the “true” quality of the faculty (Magner 1995).
The NRC study conducted surveys of faculty in each of 41 scientific fields to learn about each doctoral-granting faculty's reputation for scholarly quality (93Q) and for the effectiveness of their doctoral program (93E). In addition, the NRC gathered information about the performance of departments (number of publications, citations to the publications of faculty, and external funding) as well as some other characteristics of the faculty (number of faculty, number of full professors) and doctoral student enrollments (number of students enrolled, number of Ph.D.'s granted in recent years). With these data, it is possible to explore the extent to which reputations are responsive to the performance of the faculty as well as to other department characteristics.
The Loch Shin monzogranite is host to quartz veins bearing the sulphosalts aikinite, hammarite, lindströmite, krupkaite, gladite and pekoite, which belong to the aikinite-bismuthinite series, and represents the first significant occurrence of this series in the United Kingdom. Inclusions of the sulphotelluride tetradymite occur in krupkaite-gladite. Berryite is present as inclusions in chalcopyrite. Electron microprobe analyses reveal a range of compositions in individual crystal masses from hammarite to krupkaite in one sample, and from krupkaite to gladite in a second. Compositions between friedrichite and hammarite and gladite and pekoite are notably absent.
Investigations of the March Gravels of Northam Pit, Eye, Cambridgeshire, have provided previously undescribed molluscan, ostracod and foraminiferal faunas together with pollen spectra, which enable a detailed palaeoenvironmental synthesis to be developed. The sediments were laid down in brackish-water conditions and a temperate environment, during a Late Pleistocene temperate stage.