Mines Repository (Colorado School of Mines)
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Bridging the energy access divide: a policy gap analysis of 12 African national energy compacts under Mission 300
No full textAfrica stands at a pivotal juncture in its energy trajectory, where bold aspirations for universal electrification by 2030 confront entrenched structural and institutional barriers. Despite decades of targeted development assistance and a surge in international investment, over 600 million people across the continent remain without access to electricity, while more than 80% of rural populations continue to rely on traditional biomass for cooking. In response to this pressing challenge, twelve African governments have aligned themselves with the World Bank's Mission 300 Energy Compacts, committing to universal access through a suite of reform-oriented and infrastructure-driven strategies
Brachiopod – Platystrophia lynx
No full textPhotographed by Ron Wolf.Brown tan fossil brachiopod, front view
Gold and chalcopyrite in quartz
No full textPhotographed by Ron Wolf.Gold flecks and brass colored chalcopyrite in mass of quartz
Kermesite
No full textPhotographed by Ron Wolf.Metallic grey brown needles of kermesite, Danfeng County, Shangluo Prefecture, Shaanxi Province, China
Improving CMR ventricular volume estimation in rodents under limited data conditions
No full textAccurate ventricular volume estimation from cardiac magnetic resonance imaging (CMR) in rodents is often limited by reduced short-axis (SA) coverage due to anesthesia duration, subject health, or slice planning constraints. This study (1) evaluated how reduced SA coverage impacts volume estimates and (2) compared the performance of three reconstruction methods under these constraints: the standard Simpson’s Disk Summation (SD), a short-axis alpha-shape method (SAα), and a combined long-axis plus short-axis alpha-shape method (LA+SAα). The SAα and LA+SAα approaches are novel techniques that use alpha-meshing and Monte Carlo volume estimation to address the geometric limitations of SD. We analyzed CMR data from nine rodents (five Sham, four Pulmonary-Artery-Banded) and compared volume estimates computed with all three methods under full SA coverage (7–8 slices) and reduced coverage (5–6 slices). Incorporating a single long-axis image and mesh-based reconstruction notably improved volume accuracy, particularly for the right ventricle. These findings demonstrate that combining orthogonal imaging views with advanced volumetric estimation enhances the reliability of ventricular volume calculations under constrained imaging conditions. This approach supports more accurate preclinical cardiac assessments and provides a practical solution when full short-axis acquisition is not feasible
Eudialyte
No full textPhotographed by Ron Wolf.Rough rounded purple red eudialyte, Kukisvumchorr mountain, Murmanskaja Oblast, Russia
Calcite with sphalerite
No full textPhotographed by Ron Wolf.Vitreous orange calcite with resinous grey sphalerite
Report on the Coeur d'Alene placer, Shoshone Co., Idaho
No full textMine report no. 1742.Typescript (copy)