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Academy of Management Proceedings

$Research paper thumbnail of Natural solid-state ion conduction induces metal isotope fractionation$

Geology

Solid-state ion conduction (SSIC) occurs in the formation of natural and synthetic wire silver an... more Solid-state ion conduction (SSIC) occurs in the formation of natural and synthetic wire silver and causes consistent isotope fractionation of the mobile ion, favoring the heavy isotope. Textural analysis of natural and synthetic samples revealed that wire silver is a mosaic-like polycrystalline aggregate with superimposed striations, consistent with very rapid basal addition of Ag atoms constrained within a lateral growth footprint at the Ag-Ag 2 S interface. Growth experiments demonstrate that this process is fundamentally dependent not on the chemical environment, but only on the SSIC ability of the substrate, readily provided in this case by argentite (Ag 2 S), a superionic-conducting material. Stable Ag isotope analysis of wire silvers provides a means to observe the geochemical effects of SSIC in Ag 2 S. Natural samples were found to be enriched in the heavy isotope with a median (interquartile range) of +0.283‰ (+0.145‰ to +0.453‰). Furthermore, 109 Ag enrichment was amplified by an order of magnitude in synthetic samples grown at high temperature (>450 °C), which had a median δ 109 Ag of +2.788‰ (+1.829‰ to +3.689‰). Known isotope fractionation mechanisms would indicate that SSIC products should have negative δ isotope values because normal reaction kinetics are more likely to mobilize the lighter isotope. This indicates a previously unrecognized isotope fractionation mechanism associated with SSIC in nature, and has important implications for the geochemistry of ore deposits where SSIC phases are present. 1 GSA Data Repository item 2019221, additional images (Figures DR1-DR13), Movie DR1, and tabular isotope data (Tables DR1 and DR2),

Bulletin of the American Meteorological Society

A computerized technique for editing time-series plots of meteorological surface data by use of i... more A computerized technique for editing time-series plots of meteorological surface data by use of interactive graphics equipment is described and is compared with traditional semiautomated techniques that require considerable manual work. Editing features and selected data editing cases are discussed that illustrate the great advantages of the interactive graphics system.

Presented are materials prepared for the inservice education cf school maintenance personnel on t... more Presented are materials prepared for the inservice education cf school maintenance personnel on the subject of energy conservation in school facilities operations. The cctIrse is designed to help maintenance staff understand their schools' energy usage and formulate plans to control that usage. Among the topics covered are building inventory, preventative maintenance, energy audits, roofs, lighting, and plumbing systems. The manual contains botn course guidelines for the instructor and worksheets for course participants to fill out in advance of each lesson. (Author/WB)

Journal of Meteorology, 1955

Monthly Weather Review, 1966

Rocket data from the Meteorological Rocket Network and other sources, in addition to high-leve1,r... more Rocket data from the Meteorological Rocket Network and other sources, in addition to high-leve1,rawinsonde observations, are being employed to analyze a series of 5-, 2-, and 0.4-mb. charts. The broadscale analyses arc bcing constructed for each week of the International Years of the Quiet Sun period, and primarily cover the North American and adjacent ocean areas. Methods employed for processing the various types of data as well as the analysis procedure are described. Analyses completed thus far confirm the existence of large-scale systems, such as the wintertime polar cyclone and the Aleutian anticyclone, to at least the level of the stratopause. I n addition there is evidence of large-scale periodic oscillations in the heights of upper-stratospheric constant-pressure snrfaces during autumn and early winter. Furthermore, a significant tidal component is apparent in summertime rocketsonde winds, for which adjustment must be made in order to obtain consistent quasi-synoptic patterns.

Monthly Weather Review, 1963

The south Asian summer anticyclone is discussed with the aid of constant pressure charts, cross-s... more The south Asian summer anticyclone is discussed with the aid of constant pressure charts, cross-sections, and graphs. The maximum anticyclonic circulat,ion and the core of the subtropical easterly jet occurs close t o the 100-mb. surface. Occasionally, this High migrates from its fa\-ored position over the Tibetan Plateau westward t o the Caspian Sea. A Fourier analysis of the 100-mb. heights at 30' N. indicates that the longitudiiial positioning of wave number one is a manifestation of the Asian anticyclone. An attempt to relate the appearance and variations in the surface southwest monsoon with the development of the high-level summertime circulation suggests t h a t a direct vertical relationship is not straightforward and further study is needed to determine the exact nature of the linkage.

IEEE Transactions on Information Theory, 1973

A class of finite-memory deterministic algorithms is introduced and investigated, Optimiim algori... more A class of finite-memory deterministic algorithms is introduced and investigated, Optimiim algorithms are found for a small number of states (up to 21) and an asymptotic bound on error probability is obtained for a large number of states. The algorithms provide their own stopping rule.