356 research outputs found
43-Why You Should Read Flannery O’Connor - Dr. David Schmitt and Dr. Joel Biermann
No full textFlannery O’Connor’s perspective as a devout Catholic writing in mid-century Georgia is observant and powerful. The theology intertwined into the narratives of her stories set her apart as an author. Dr. David Schmitt, professor of practical theology, and Dr. Joel Biermann, professor of systematic theology, discuss her influence and make a case for reading her work..
This podcast is also available at concordiatheology.org and all major podcast platforms
Word and Work Session 72
No full textIn Word and Work: An Intersection, Concordia Seminary, St. Louis, President Emeritus Dr. Dale A. Meyer tackles the subject of how we as Christians should interface with our secular culture and the government with Professor of Systematic Theology Dr. Joel Biermann. “God is at work in the world,” Biermann says. “Christians and the church need to help the government stay accountable and stay truthful. When we tell people, ‘in God we trust’ and ‘one nation under God,’ really that’s a reminder that you’re accountable to God for what you do. God is going to judge you someday. Are you doing things the way He wants you?” Biermann is the author of Wholly Citizens: God’s Two Realms and Christian Engagement with the World. In the audio version of the program, listen to a recent chapel sermon from Biermann. Learn more at Concordia Theology.https://scholar.csl.edu/wordandwork/1081/thumbnail.jp
MAGNETIC FIELD GENERATION BY BIERMANN BATTERY AND WEIBEL INSTABILITY IN LABORATORY SHOCK WAVES
No full textMagnetic field generation in the Universe is still an open problem. Possible mechanisms involve the Weibel instability, due to anisotropic phase-space distributions, as well as the Biermann battery, due to misaligned density and temperature gradients. These mechanisms can be reproduced in scaled laboratory experiments. In this contribution we estimate the relative importance of these two processes and explore the laser-energy requirements for producing Weibel dominated shocks. © The Author(s) 2013
Word and Work Session 02
No full textConcordia Seminary, St. Louis President Dr. Dale A. Meyer discusses the book, Wholly Citizens, with author Dr. Joel Biermann, the Seminary’s Waldemar A. and June Schuette Professor of Systematic Theology, as well as the relationship of church and world in light of Luther’s teachings. Word and Work: An Intersection provides a behind-the-scenes look at ministry where everyday life and God’s Word meet. Learn more at Concordia Theology. Learn more about Wholly Citizens from Fortress Press here Wholly Citizens.https://scholar.csl.edu/wordandwork/1001/thumbnail.jp
Photon-photon absorption above a molecular cloud torus in blazars
No full textGamma rays have been observed from two blazars at TeV energies. One of these, Markarian 421, has been observed also at GeV energies and has roughly equal luminosity per decade at GeV and TeV energies. Photon-photon pair production on the infrared background radiation is expected to prevent observation above ∼ 1 TeV. However, the infrared background is not well known and it may be possible to observe the nearest blazars up to energies somewhat below ∼ 100 TeV where absorption on the cosmic microwave background will give a sharp cut-off. Blazars are commonly believed to correspond to low power radio galaxies, seen down along a relativistic jet; as such they are all expected to have the nuclear activity encircled by a dusty molecular torus, which subtends an angle of 90 degrees or more in width as seen from the central source. Photon-photon pair production can also take place on the infrared radiation produced at the AGN by this molecular torus and surrounding outer disk. We calculate the optical depth for escaping γ-rays produced near the central black hole and at various points along the jet axis for the case of blazars where the radiation is observed in a direction closely aligned with the jet. We find that the TeV emission site must be well above the top of the torus. For example, if the torus has an inner radius of 0.1 pc and an outer radius of 0.2 pc, then the emission site in Mrk 421 would have be at least 0.25 pc above the upper surface of the torus, and if Mrk 421 is observed above 50 TeV in the future, the emission site would have to be at least 0.5 pc above the upper surface. This has important implications for models of γ-ray emission in active galactic nuclei. © 1997 Elsevier Science B.V.Protheroe, R.J. ; Biermann, P.L
Planetary stewardship in an urbanizing world: beyond city limits
No full textCities are rapidly increasing in importance as a major factor shaping the Earth system, and as such must take corresponding responsibility. With currently over half of the world population, cities are supported by resources originating from primarily rural regions that are often located around the world far distant from the urban loci of use. The multiple and complex environmental and social challenges the world faces require interconnected solutions and a coordinated governance approach to planetary stewardship. There is a new opportunity to conceptualize a key component of planetary stewardship as a global system of cities that develop sustainable processes and policies in concert with its non-urban areas. The potential for cities to cooperate as a system and with rural connectivity could not only increase their capacity to effect change and foster stewardship at the planetary scale but also increase their resource security
A new estimate of the extragalactic radio background and implications for ultra-high-energy γ-ray propagation (Astroparticle Physics 6 (1996) 45)
No full textClimate Policy and Border Tax Adjustments: Some New Wine Mixed with Old Wine in New Green Bottles?
No full textCurrent policy discussions are making a very clear connection between domestic climate policies and international trade. In this article, the economic, legal and implementation issues relating to border tax adjustments for climate policies are discussed. The overall conclusion drawn is that the connection between trade and the environment is not new, having been discussed in considerable detail since the early 1990s, and reflected in an extensive economics literature. In addition, the legal aspects of border tax adjustments are not particularly new, although only a WTO ruling on their use in the presence of domestic climate policies will resolve any legal uncertainty about their use. However, there are some new issues concerning the determination and implementation of border tax adjustments for domestic climate polices that do present additional layers of complexity.climate policy, competitiveness, border tax adjustment, Environmental Economics and Policy, Financial Economics, Political Economy,
The Nature and Origin of Ultra-high Energy Cosmic Ray Particles
No full textWe outline two concepts to explain Ultra High Energy Cosmic Rays (UHECRs), one based on radio galaxies and their relativistic jets and terminal hot spots, and one based on relativistic Super-Novae (SNe) or Gamma Ray Bursts (GRBs) in starburst galaxies, one matching the arrival direction data in the South (the radio galaxy Cen A) and one in the North (the starburst galaxy M82). The most likely identification of the origin of observed Gravitational Wave (GW) events is stellar binary black hole (BH) mergers in starburst galaxies such as M82 with the highest rate of star formation, so the highest far-infrared (FIR) luminosity, at the edge of the universe visible in 10 - 300 Hz GWsat low heavy element abundance Zch the formation of stellar BHs extends to a larger mass range. A radio galaxy such as Cen A sequence of events involves first the merger of two Super-Massive Black Holes (SMBHs), with the associated ejection of low frequency GWs, then the formation of a new relativistic jet aiming into a new direction: ubiquitous neutrino emission follows accompanied by compact TeV photon emission, detectable more easily if the direction is towards Earth. The ejection of UHECRs is last. Both these sites are the perfect high energy physics laboratory: We have observed particles up to ZeV, neutrinos up to PeV, photons up to TeV, 30 - 300 Hz GW events, and hope to detect soon of order µHz to mHz GW events. Energy turnover in single low frequency GW events may be of order ∼1063 erg. How can we further test these concepts? First of all by associating individual UHECR events, or directional groups of events, with chemical composition in both the Telescope Array (TA) Coll. and the Auger Coll. data. Second by identifying more TeV
to PeV neutrinos with recent SMBH mergers. Third by detecting the order < mHz GW events of SMBH binaries, and identifying the galaxies host to the stellar BH mergers and their GW events in the range up to 300 Hz. Fourth by finally detecting the formation of the first generation of SMBHs and their mergers, surely a spectacular discovery
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