Study made of anodized aluminum circuit boards

Hard coated aluminum circuit boards demonstrate the feasibility of obtaining an electrical power circuit of high packaging density with very high thermal conductivity and mechanical strengths

Variational approach to transport in quantum dots

We have derived a variational principle that defines the nonequilibrium steady-state transport across a correlated impurity mimicking, e.g., a quantum dot coupled to biased leads. This variational principle has been specialized to a Gutzwiller's variational space, and applied to the study of the simple single-orbital Anderson impurity model at half filling, finding a good qualitative accord with the observed behavior in quantum dots for the expected regime of values of the bias. Beyond the purely theoretical interest in the formal definition of a variational principle in a nonequilibrium problem, the particular methods proposed have the important advantage to be simple and flexible enough to deal with more complicated systems and variational spaces.Comment: 15 pages, 4 figure

Seismic response to evolving injection at the Rotokawa geothermal field, New Zealand

Catalogs of microseismicity are routinely compiled at geothermal reservoirs and provide valuable insights into reservoir structure and fluid movement. Hypocentral locations are typically used to infer the orientations of structures and constrain the extent of the permeable reservoir. However, frequency-magnitude distributions may contain additional, and underused, information about the distribution of pressure. Here, we present a four-year catalog of seismicity for the Rotokawa geothermal field in the central Taupō Volcanic Zone, New Zealand starting two years after the commissioning of the 140 MWe Nga Awa Purua power station. Using waveform-correlation-based signal detection we double the size of the previous earthquake catalog, refine the location and orientation of two reservoir faults and identify a new structure. We find the rate of seismicity to be insensitive to major changes in injection strategy during the study period, including the injectivity decline and shift of injection away from the dominant injector, RK24. We also map the spatial distribution of the earthquake frequency-magnitude distribution, or b-value, and show that it increases from ∼1.0 to ∼1.5 with increasing depth below the reservoir. As has been proposed at other reservoirs, we infer that these spatial variations reflect the distribution of pressure in the reservoir, where areas of high b-value correspond to areas of high pore-fluid pressure and a broad distribution of activated fractures. This analysis is not routinely conducted by geothermal operators but shows promise for using earthquake b-value as an additional tool for reservoir monitoring and management

Scriptural Reflections on History (Book Review)

Reviewed title: Scriptural Reflections on History by K. J. Popma. Translated and edited by Harry Van Dyke. Aalten, The Netherlands: Wordbridge Publishing, 2020. 142 pp. ISBN: 9789076660578

Expansion of Evangelicalism: The Age of Wilberforce, More, Chalmers and Finney (Book Review)

Reviewed Title: Wolffe, John. The Expansion of Evangelicalism: The Age of Wilberforce, More, Chalmers and Finney. (A History of Evangelicalism: People, Movements and Ideas in the English-Speaking World, vol. II). Downers Grove, IL: InterVarsity Press, 2007. 280 pp. incl. bibliography. ISBN: 978-0-8308-2582-0

John Owen, Richard Baxter and the Formation of Nonconformity (Book Review)

Reviewed Title: Cooper, Tim. John Owen, Richard Baxter and the Formation of Nonconformity. Farnham, England: Ashgate, 2011. 343 pages. ISBN: 9780754663614

Fortunes of History: Historical Inquiry from Herder to Huizinga (Book Review)

Reviewed Title: Donald R. Kelley, Fortunes of History: Historical Inquiry from Herder to Huizinga. Yale University Press, 2003. xiii + 426 pp. ISBN: 0-300-09578-3

Problems in the Christian Origins of Modern Science

Response to Nancy Pearce