Geology of the Snap Lake kimberlite intrusion, Northwest Territories, Canada: field observations and their interpretation

The Cambrian (523 Ma) Snap Lake hypabyssal kimberlite intrusion, Northwest Territories, Canada, is a complex segmented diamond-bearing ore-body. Detailed geological investigations suggest that the kimberlite is a multi-phase intrusion with at least four magmatic lithofacies. In particular, olivine-rich (ORK) and olivine-poor (OPK) varieties of hypabyssal kimberlite have been identified. Key observations are that the olivine-rich lithofacieshas a strong tendency to be located where the intrusion is thickest and that there is a good correlation between intrusion thickness, olivine crystal size and crystal content. Heterogeneities in the lithofacies are attributed to variations in intrusion thickness and structural complexities. The geometry and distribution of lithofacies points to magmaticco-intrusion, and flow segregation driven by fundamental rheological differences between the two phases. We envisage that the low-viscosity OPK magma acted as a lubricant for the highly viscous ORK magma. The presenceof such low-viscosity, crystal-poor magmas may explain how crystal-laden kimberlite magmas (>60 vol.%) are able to reach the surface during kimberlite eruptions. We also document the absence of crystal settling and the development of an unusual subvertical fabric of elongate olivine crystals, which are explained by rapid degassing-induced quench crystallization of the magmas during and after intrusio

Battery workshop

The workshop was attended by representatives from industry and government. The requirements for energy storage and the plans for battery development were reviewed. The workshop followed a debate format, with the objective of recommending improvements to the development plans presented by NASA and the Air Force. The issues addressed were: (1) significant technology deficiencies which can be identified; (2) adequacy of current and proposed programs to resolve the technology deficiencies identified; (3) additional tasks which should be undertaken, including benefits and timing; and (4) lowest priority items in the presently planned program, both in content and in timing

Available low temperature thermocouple information and services

Voltage vs temperature data for thermocouple pairs at low temperatures - cryogenic temperatur

A Search for Candidate Light Echoes: Photometry of Supernova Environments

Supernova (SN) light echoes could be a powerful tool for determining distances to galaxies geometrically, Sparks 1994. In this paper we present CCD photometry of the environments of 64 historical supernovae, the first results of a program designed to search for light echoes from these SNe. We commonly find patches of optical emission at, or close to, the sites of the supernovae. The color distribution of these patches is broad, and generally consistent with stellar population colors, possibly with some reddening. However there are in addition patches with both unusually red and unusually blue colors. We expect light echoes to be blue, and while none of the objects are quite as blue in V-R as the known light echo of SN1991T, there are features that are unusually blue and we identify these as candidate light echoes for follow-on observations.Comment: 13 pages, Latex, 5 Postscript Tables, 42 Postscript figures, accepted for publication in the A&AS. Figures 1 through 36 are available at the web address: http://www.stsci.edu/~boffi

Cryogenic thermocouple calibration tables

Thermocouple calibration standards are developed for low-temperature thermocouple materials. Thermovoltage, thermopower, and the thermopower derivative are presented in tabular and graphical form

Carbon thin film thermometry

The work concerning carbon thin film thermometry is reported. Optimum film deposition parameters were sought on an empirical basis for maximum stability of the films. One hundred films were fabricated for use at the Marshall Space Flight Center; 10 of these films were given a precise quasi-continuous calibration of temperature vs. resistance with 22 intervals between 5 and 80 K using primary platinum and germanium thermometers. Sensitivity curves were established and the remaining 90 films were given a three point calibration and fitted to the established sensitivity curves. Hydrogen gas-liquid discrimination set points are given for each film

A stress-controlled mechanism for the intensity of very large magnitude explosive eruptions

Large magnitude explosive eruptions are the result of the rapid and large-scale transport of silicic magma stored in the Earth's crust, but the mechanics of erupting teratonnes of silicic magma remain poorly understood. Here, we demonstrate that the combined effect of local crustal extension and magma chamber overpressure can sustain linear dyke-fed explosive eruptions with mass fluxes in excess of 10^10 kg/s from shallow-seated (4–6 km depth) chambers during moderate extensional stresses. Early eruption column collapse is facilitated with eruption duration of the order of few days with an intensity of at least one order of magnitude greater than the largest eruptions in the 20th century. The conditions explored in this study are one way in which high mass eruption rates can be achieved to feed large explosive eruptions. Our results corroborate geological and volcanological evidences from volcano-tectonic complexes such as the Sierra Madre Occidental (Mexico) and the Taupo Volcanic Zone (New Zealand)

Foreigners United: Foreign Influence in American Elections After Citizens United v. Federal Election Commission

This Note argues that the majority’s decision in Citizens United allows foreign nationals to circumvent the Congressional ban on influencing American elections, and that Citizens United should be reconsidered in light of this fact, as well as the compelling government interest in preventing such circumvention, and preserving the integrity of the electoral process. Part II provides an overview of the Congressional ban and Citizens United’s relationship to its circumvention. Part III.A analyzes the methods by which foreign nationals can circumvent the ban in order to influence American elections. Part III.B proposes both judicial and legislative solutions to the problem of foreign election influence created by Citizens United. Part III.C presents and analyzes a representative sample of other existing solutions to foreign election influence. Part IV identifies and refutes counterarguments that would support the decision in Citizens United and its progeny

Foreigners United: Foreign Influence in American Elections After Citizens United v. Federal Election Commission

This Note argues that the majority’s decision in Citizens United allows foreign nationals to circumvent the Congressional ban on influencing American elections, and that Citizens United should be reconsidered in light of this fact, as well as the compelling government interest in preventing such circumvention, and preserving the integrity of the electoral process. Part II provides an overview of the Congressional ban and Citizens United’s relationship to its circumvention. Part III.A analyzes the methods by which foreign nationals can circumvent the ban in order to influence American elections. Part III.B proposes both judicial and legislative solutions to the problem of foreign election influence created by Citizens United. Part III.C presents and analyzes a representative sample of other existing solutions to foreign election influence. Part IV identifies and refutes counterarguments that would support the decision in Citizens United and its progeny

A Phenomenological Investigation of Counselors’ Experiences With Clients Affected by Problematic Internet Pornography Use

The primary researcher conducted a phenomenological study examining the experiences of licensed professional counselors (n = 8) who have worked with clients affected by problematic Internet pornography use. There were five female participants with an average age of 49 and three males with an average age of 63. All eight participants identified as Christian. Four participants reported their highest level of education was a Master’s degree, three participants reported holding a Ph.D. and one participant reported holding an Ed.S. Through semi-structured interviews, the primary researcher of this study sought to gain an understanding of how counselors were experiencing and navigating this phenomenon. The research team constructed three superordinate themes: confusion and discomfort, beliefs and biases and treatment challenges. In addition, the research team identified 14 themes and 9 subthemes through consensual coding of the data. The findings of this study may inform counselors, counselor educators and supervisors on how to ethically and effectively work with clients experiencing problematic Internet pornography use