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101.
Derek W. G. Sears 《Geochronometria》2011,38(3):303-313
Early work on meteorite thermoluminescence, influenced by pottery dating and dosimetry applications, demonstrated a relationship
between natural thermoluminescence and (1) the orbital perihelion of a meteorite and (2) the terrestrial age (time since fall)
of a meteorite. For 14 years natural TL measurements were routinely made on newly recovered Antarctic meteorites to help identify
unusual thermal and radiation histories, and to sort them by terrestrial age and perihelion. Two examples of the value of
such data are presented, an Antarctic meteorite that underwent a major orbit change prior to fall and the collection mechanics
of meteorites at the Lewis Cliff collection site. A second major area of focus for meteorite TL, that has no non-meteorite
heritage, is the use of their induced TL to provide an extraordinarily sensitive and quantitative means of exploring metamorphic
intensity and palaeothermometry. While especially valuable for unequilibrated ordinary chondrites, these types of measurement
have proved useful with virtually every major class of meteorite, asteroidal and planetary. The challenge now is to extend
the technique to small particles, micrometeorites, interplanetary dust particles, and cometary particles. 相似文献
102.
Penslar D 《German history》2011,29(3):423-444
The story of German-Jewish soldiers and veterans of World War I illustrates how, under circumstances of inclusion (even if incomplete) rather than vicious persecution, Jewish suffering in wartime, and with it the forms of collective memory and strategies for commemoration of the dead, could closely parallel, even intersect with, the suffering of Germans as a whole. To be sure, the points of intersection were accompanied by points of deflection. Even when Jews served, fought, suffered and died as German soldiers, their interpretations of the war experience, and their communities’ postwar memory and commemorative practices, differed from those of other Germans. In many ways, however, German-Jewish veterans suffered the aftermath of the war as did other Germans; they shared the prevailing fury over war guilt and reparations, and they retained a strong pride in their military service, a pride through which they interpreted the events of 1933–1945. 相似文献
103.
Permeability of the Mercia Mudstone: suitability as caprock to carbon capture and storage sites
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The Upper Triassic Mercia Mudstone is the caprock to potential carbon capture and storage (CCS) sites in porous and permeable Lower Triassic Sherwood Sandstone reservoirs and aquifers in the UK (primarily offshore). This study presents direct measurements of vertical (kv) and horizontal (kh) permeability of core samples from the Mercia Mudstone across a range of effective stress conditions to test their caprock quality and to assess how they will respond to changing effective stress conditions that may occur during CO2 injection and storage. The Mercia samples analysed were either clay‐rich (muddy) siltstones or relatively clean siltstones cemented by carbonate and gypsum. Porosity is fairly uniform (between 7.4 and 10.7%). Porosity is low either due to abundant depositional illite or abundant diagenetic carbonate and gypsum cements. Permeability values are as low as 10?20 m2 (10nD), and therefore, the Mercia has high sealing capacity. These rocks have similar horizontal and vertical permeabilities with the highest kh/kv ratio of 2.03 but an upscaled kh/kv ratio is 39, using the arithmetic mean of kh and the harmonic mean of kv. Permeability is inversely related to the illite clay content; the most clay‐rich (illite‐rich) samples represent very good caprock quality; the cleaner Mercia Mudstone samples, with pore‐filling carbonate and gypsum cements, represent fair to good caprock quality. Pressure sensitivity of permeability increases with increasing clay mineral content. As pore pressure increases during CO2 injection, the permeability of the most clay‐rich rocks will increase more than carbonate‐ and gypsum‐rich rocks, thus decreasing permeability heterogeneity. The best quality Mercia Mudstone caprock is probably not geochemically sensitive to CO2 injection as illite, the cause of the lowest permeability, is relatively stable in the presence of CO2–water mixtures. 相似文献
104.
Derek O'Brien 《The Journal of imperial and commonwealth history》2019,47(3):591-617
Almost half of the bicameral legislatures in the Commonwealth are located in the Commonwealth Caribbean. Why so many bicameral legislatures are located in a relatively small geographic region, which is composed of countries that manifest characteristics more usually associated with unicameralism—small size, a unitary state, and homogeneity—is puzzling. Scholars have offered two possible explanations. The first concerns the presumed wish of the region’s political leaders upon independence to replicate the values and institutions of their colonial mentor, Britain. The second concerns the presumed need to prevent one-party dominance by guaranteeing the representation of opposition parties in the second chamber. This paper challenges both these explanations. By examining the origins of bicameralism in the region with the arrival of the first settlers in the seventeenth century, its demise during the era of crown colony rule in the nineteenth century, its renaissance in the 1950s and 1960s, and its survival in the post-independence era this paper will offer a more multi-layered explanation This entails taking account of the complex relationship between these former colonies and their imperial past, the wide range of views expressed both locally and within the Colonial Office about the suitability of bicameralism in the debates that accompanied the transition from colonial rule to independence, and, finally, the very distinctive nature of Caribbean bicameralism. 相似文献
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Derek Gregory 《Political Geography》2010,29(5):266-279
In late modern war visuality plays a vital role in both the conduct and the rationalization of military violence. This essay explores the techno-cultural apparatus of US military operations and media briefings in occupied Baghdad from 2003 to 2007. It traces the visual reconfiguration of the city as a space of events rather than purely objects. These digital mappings were an intrinsic part of the US Army’s counterinsurgency strategy, and their performances were punctuated by a dialectical interplay of geopolitical and biopolitical imaginaries that was focal to the abstraction and legitimation of American military intervention. 相似文献
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