In this paper the design of a rig capable to simulate the dynamic response of an energy storing and returning composite prosthetic foot during amputee running is considered. It has been assumed that the amputee/prosthesis system can be modelled as a spring/mass system. Therefore the rig has been designed to allow the applied mass, input force and foot contact point of various feet designs to be varied to test this assumption. The rig will allow the design variables that contribute to the response of a prosthetic foot during running to be understood and optimised to improve the foot's performance.
Palau Islands, 7 derajat 30 N, are the only emergent feature on the more than 2500-km¬long Kyushu-Palau Ridge. Small islands are mainly uplifted reef carbonate. Larger islands are volcanic with basalt to dacite and rare boninite. Polymict breccia is abundant: sills, flows, and dykes are common but pillows are rare. Palau Trench samples include all types found on the islands as well as high-Mg basalt. Volcanism began in the late Eocene and ended by early Miocene. All igneous rocks comprise a low-K primitive island arc-tholeiite series. None are mid-ocean ridge basalts. Rare earth elements and high field-strength elements indicate a depleted mantle source. Elevated large ion lithophile elements and light rare earth elements indicate influx of dehydration fluid. Ce/Ce and Eu/Eu ratios show no evidence for recycling of are-derived clastics. Plate reconstructions and paleomagnetic data suggest that the are probably formed on the trace of a transform fault that migrated northward and rotated clockwise up to 90 derajat. Episodes of transtension caused upwelling of hot mantle into depleted mantle and sheared altered rocks of the transform. Episodes of transpression may have initiated subduetion of old seafloor with a thin cover of pelagie sediments deposited far from terrigenous sediment sources.
Journal Article Organizational Structure and Activities of State Cancer Programs Get access James W. Hawkins James W. Hawkins passed assistant surgeon National Cancer Institute, National Institute of Health, United States Public Health Service Search for other works by this author on: Oxford Academic PubMed Google Scholar JNCI: Journal of the National Cancer Institute, Volume 4, Issue 4, February 1944, Pages 347–350, https://doi.org/10.1093/jnci/4.4.347 Published: 01 February 1944
The Negros Arc in west central Philippines is comprised of six Pliocene to Quaternary stratovolcanoes that have erupted calc‐alkaline to slightly shoshonitic basalts to dacites. Petrographic, major and trace element, and Sr, Nd, and Pb isotope data suggest that crustal level differentiation processes have likely generated the range in composition of lavas. Several silicic lavas from the southern volcanoes have high Sr and moderate Sr/Y similar to melts presumed to be derived from subducted basaltic crust (adakites). However, these silicic lavas have low La/Yb unlike typical adakites, and have other incompatible trace element ratios (e.g., Nb/Ta, Ba/La, Pb/Ce) which are opposite to those expected of adakites. Modeling results also indicate that partial melting of the subducting Southeast Sulu Sea crust cannot satisfactorily reproduce the adakite‐like characteristics or account for the other incompatible trace element ratios. Fractionation of amphibole (± apatite) together with variable fractionation and accumulation of plagioclase have likely imparted the adakite‐like features. Trace element and isotopic variations indicate a three‐component mixing, whereby variable proportions of melted sediment and aqueous fluids derived from basaltic crust were added to the subarc MORB‐source type mantle to form the source of Negros Arc lavas. Southern Negros lavas reflect the strongest fluid contribution whereas northern Negros lavas best exhibit the sediment melt contribution.
We present the results of an experimental study on a refractory back-arc basin glass composition 123 95–1 recovered close to the intersection of the North Western Lau Spreading Centre and the Peggy Ridge in the Central Lau Basin. We used both the inverse and forward experimental approaches to determine that a picrite composition of ∼16 wt % MgO was parental to the refractory back-arc basalt composition and that this picrite was in equilibrium with a residual lherzolite assemblage at ∼2.1 GPa, ∼1460°C. Our experimental results suggest that this primary picrite represents neither an aggregate of small melt fractions collected over a depth interval in a melting column nor a small melt fraction. Instead, the primary picrite composition represents a significant melt fraction (15% melting) of a lherzolite source, and its composition is closely modelled by equilibrium batch melting. Our preferred model of magma genesis involves three-dimensional diapiric flow during which significant solid–melt re-equilibration occurs. Melts are trapped within an ascending diapir until melting reaches a moderate to high fraction (15–25%), at which point the primary picrite magmas segregate from the diapir.
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