A study of suffusion kinetics inspired from experimental data: comparison of three different approaches     

Kodieh  A.  Gelet  R.  Marot  D.  Fino  A. Z. 《Acta Geotechnica》2021,16(2):347-365

Acta Geotechnica - Suffusion is a complex phenomenon characterized by a selective migration of the fine particles under the effect of three coupled processes: detachment, transport and possible...  相似文献   

Urban flooding in Lagos,Nigeria: Patterns of vulnerability and resilience among women     

Idowu Ajibade  Gordon McBean  Rachel Bezner-Kerr 《Global Environmental Change》2013,23(6):1714-1725

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Geographies of age: thinking relationally   总被引：1，自引：0，他引：1  

Peter Hopkins  Rachel Pain 《Area》2007,39(3):287-294

In contrast to recent treatment of other social identities, geographers' work on age still focuses disproportionately on the social-chronological margins – the very young and (to a far lesser extent) the very old – and rarely connects them directly. We outline the benefits of creating relational geographies of age, in order to build out from the recent explosion of children's geographies, and discuss three helpful concepts: intergenerationality, intersectionality and lifecourse. We suggest that participation provides one epistemological vehicle for getting beyond geographies which are mainly adults'.  相似文献   

Global telescope networks for astronomy education     

Paul Roche  Rachel Dodds 《Astronomy& Geophysics》2007,48(4):4.16-4.18

Ever wanted to give school students or the public a closer look at the stars, without worrying about the vagaries of the UK weather? Paul Roche and Rachel Dodds from the Faulkes Telescope Project explain how you can do just that – without even leaving the classroom!  相似文献   

Determination of fault planes in a complex aftershock sequence using two-dimensional slip inversion     

Rachel E. Abercrombie  Stephen Bannister  Aasha Pancha  Terry H. Webb  Jim J. Mori 《Geophysical Journal International》2001,146(1):134-142

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Cryostorage of hepatic microsomes from two marine mammal species: effects on cytochrome P450-monooxygenase activities and content     

Tilley RE  Kemp GD  Hall AJ 《Marine pollution bulletin》2003,46(5):654-658

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The lunar rock and mineral characterization consortium: Deconstruction and integrated mineralogical,petrologic, and spectroscopic analyses of mare basalts     

Peter J. ISAACSON  Amit BASU SARBADHIKARI  Carlé M. PIETERS  Rachel L. KLIMA  Takahiro HIROI  Yang LIU  Lawrence A. TAYLOR 《Meteoritics & planetary science》2011,46(2):228-251

The lunar rock and mineral characterization consortium (LRMCC) has conducted coordinated mineralogy/petrography/spectroscopy analyses of a suite of pristine lunar basalts. Four basalt slabs (two low‐Ti, two high‐Ti) and paired thin sections were analyzed. Thin sections were analyzed for mineralogy/petrography, while the slabs were used to prepare particulate separates of major mineral phases and bulk samples. Mineral separates and particulate bulk samples were crushed to controlled grain sizes and their reflectance spectra measured in the NASA RELAB at Brown University. The resulting data set provides an essential foundation for spectral mixing models, offers valuable endmember constraints for space weathering analyses, and represents critical new ground truth results for lunar science and exploration efforts.  相似文献   

Near‐infrared spectra of clinopyroxenes: Effects of calcium content and crystal structure     

Rachel L. KLIMA  M. Darby DYAR  Carlé M. PIETERS 《Meteoritics & planetary science》2011,46(3):379-395

Abstract– Pyroxenes are among the most common minerals in the solar system and are ideally suited for remote geochemical analysis because of the sensitivity of their distinctive spectra to mineral composition. Fe²⁺ is responsible for the dominant pyroxene absorptions in the visible and near‐infrared, but substitutions of other cations such as Ca²⁺ change the crystal structure and site geometries and thus the crystal field splitting energies of the Fe cations. To define spectral systematics resulting from major pyroxene cations (Ca²⁺, Mg²⁺, and Fe²⁺), we focus on a suite of pyroxenes synthesized with only Ca²⁺, Mg²⁺, and Fe²⁺ in the two octahedral sites, specifically examining the effect of Ca²⁺ on pyroxene absorption bands. The modified Gaussian model is used to deconvolve pyroxene spectra into component bands that can then be linked directly to crystal field absorptions. In orthopyroxenes and low‐Ca clinopyroxenes, Ca²⁺‐content has a strong and predictable effect on the positions of the absorption bands. At a threshold of Wo₃₀, the crystal field environment stagnates and the M2 bands cease to change significantly as more Ca²⁺ is added. At Wo₅₀, when most of the M2 sites are filled by Ca²⁺, band positions do not change drastically, although the presence and strengths of the 1 and 2 μm bands are affected by even trace amounts of Fe²⁺ in the M2 site. It is thus apparent that next‐nearest neighbors and the distortions they impose on the pyroxene lattice affect the electronic states around the Fe²⁺ cations and control absorption band properties.  相似文献   

Resource allocation for regional earthquake risk mitigation: a case study of Tehran,Iran   总被引：1，自引：1，他引：0  

Pantea Vaziri  Rachel A. Davidson  Linda K. Nozick  Mahmood Hosseini 《Natural Hazards》2010,53(3):527-546

This paper presents a new optimization model to help cities in seismically active developing countries decide (1) How much to spend on pre-earthquake mitigation versus waiting until after an event and paying for reconstruction or simply not rebuilding damaged buildings? (2) Which buildings to mitigate and how? and (3) Which buildings to reconstruct and how? It extends previously developed optimization models to consider the particular issues that arise in such countries. First, the model allows for the possibility that some damaged buildings will not be reconstructed immediately and keeps track of any lost building inventory. Second, buildings can be mitigated to, or when damaged, reconstructed to, any appropriate structural type and seismic design level. Finally, the model objectives include minimizing the chance of an extremely high death toll in any one earthquake and minimizing the average annual death toll across earthquakes. The model is illustrated through a case study analysis for Tehran, Iran.  相似文献   

Density profiles of galaxy groups and clusters from SDSS galaxy–galaxy weak lensing     

Rachel Mandelbaum  Uro&#; Seljak  Richard J. Cool  Michael Blanton  Christopher M. Hirata  Jonathan Brinkmann 《Monthly notices of the Royal Astronomical Society》2006,372(2):758-776

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