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Socorro, NM, United States

New Mexico Institute of Mining and Technology is a university located in Socorro, New Mexico. New Mexico Tech offers over 30 bachelor of science degrees in technology, the science, engineering , management, and technical communication, as well as graduate degrees at the masters and doctoral levels. In one 2010 Newsweek article, New Mexico Tech is considered one of the best small science and engineering schools in North America.A recent National Science Foundation study of Baccalaureate Origins of S&E Doctorate Recipients in the U.S. ranked New Mexico Tech as 15th in the nation, as well as the number one ranked public institution. Wikipedia.

Effects of intake preheat engine on performance and emissions of a compression ignition engine running on biodiesel (85%)-alcohol (15%) fuels were investigated and compared to baseline results of standard diesel and neat biodiesel. Emissions were compared at two elevated intake air temperature and results indicate that high heat of vaporization of alcohol fuels affect emissions significantly. Intake air preheat was proved to be one of the effective solutions to reduce CO and HC emissions. Reduction of alcohol concentration in biodiesel-alcohol blends also showed similar effects to preheating intake air temperature. © 2011 Elsevier Ltd. All rights reserved.

Lim S.,New Mexico Institute of Mining and Technology
International Journal of Impact Engineering | Year: 2012

The sweeping detonation effect creates a unique turning angle of plates upon detonation. This effect was addressed by G. I. Taylor and opens a broad range of applications in many different engineering regimes. In case of linear shaped charges (LSCs), because of the unique geometrical shape, which are comprised of long, flat liners and multiple flat claddings, an approach to understand the performance of LSCs must be analyzed under the Taylor turning angle, motivating this research. In this paper, an analytical approach to describe the unique liner motion of LSCs upon detonation is addressed first. Subsequent modification of the original Birkhoff theory is addressed in order to build a steady state analytical equation of motion of LSCs liner based on the Taylor turning angle. The analytical model is then compared to the numerical simulation results created from Autodyn™ in terms of M/C ratio and apex angles in reasonable sized LSCs, and it exhibits favorable results in a limited range. © 2011 Elsevier Ltd. All rights reserved.

Eriksson P.G.,University of Pretoria | Condie K.C.,New Mexico Institute of Mining and Technology
Gondwana Research | Year: 2014

The ca. 2.45-2.0. Ga supracratonic record of six cratonic terranes (Superior Province, Hearne Domain, Fennoscandian crustal segment, and São Francisco, Pilbara and Kaapvaal cratons) is investigated. A <~2415-2420 basal unconformity appears pervasive, floored by basement lithologies for the three "Kenorland-related" terranes (Superior, Hearne and Fennoscandian) and by passive margin chemical sedimentary platform deposits for the apparently "non-amalgamated" cratons. Palaeosols are locally associated with this unconformity, and glacigenic lithologies, for all of the "non-amalgamated" cratons as well as for Superior. A relatively complete sedimentary record is recorded for the three Kenorland supercontinent terranes, including at least two glacial events, whereas hiatuses characterise the Pilbara and São Francisco cratons, with an incomplete record for Kaapvaal. Evidence for geodynamic reactivation at ca. 2.2. Ga includes widespread mafic dykes and volcanics, orogenies in Pilbara and São Francisco, glaciation in Kaapvaal and Pilbara, and significant transgressions thereafter on many of the cratonic terranes. While the overall ca. 2.45-2.2. Ga records studied here are at least compatible with the postulated global magmatic slowdown of Condie et al. (2009), distinct differences between the records associated with "Kenorland-related" and "non-amalgamated" cratons might reflect thermal subsidence and associated sedimentation accompanying the slowdown for the former group (where thermal blanketing likely played a role), while elevated freeboard and concomitant erosive regimes accompanied the inferred slowdown for the latter group. © 2012 International Association for Gondwana Research.

Earthquakes along the shallow South American subduction zone exhibit heterogeneous rupture characteristics, going back several centuries of the earthquake record in this area. This heterogeneity is manifest in several ways, such as changes in rupture mode from magnitude > 8 events during one century followed by smaller ones in other time periods, as well as unusual tsunami events. There is also an apparent interaction between earthquake rupture and subducting plate complexity in this region. Significant complexity exists on the subducting Nazca plate, including fracture zones and ridges such as the large Nazca Ridge. Several large magnitude earthquakes have occurred in the region of ridge subduction, but no earthquake rupture has ruptured through these features into adjacent regions, suggesting that these subducting features act to segment the margin. Other features, such as fracture zones and variable sediment thickness on the Nazca Plate, appear to influence earthquake behavior over a wide range of magnitude scales. Upper plate features such as crustal faults also lead to heterogeneous earthquake behavior. Here I provide an overview of seismicity along the margin since 1850 in the context of the subduction zone structures. This includes great earthquakes such as the 1906 Ecuador and 1960 Chile events. I also present results showing increased rupture complexity in moderate magnitude earthquakes that can also be linked to certain Nazca Plate features. © 2009 Elsevier B.V.

Edens H.E.,New Mexico Institute of Mining and Technology
Applied Optics | Year: 2015

A photograph has been obtained of a natural fifth-order (quinary) rainbow. The photograph was acquired on 8 August 2012 with a digital camera and a polarization filter to maximize contrast of the rainbows with the background. The quinary rainbow, together with its first supernumerary, appears in a contrastenhanced version of the photograph as broad green and blue-violet color bands within Alexander's dark band between the primary and secondary rainbows. The red band of the quinary rainbow is obscured by the much brighter secondary rainbow. A comparison with a numerical simulation using the Debye series confirms that the color bands of the quinary rainbow appear at the expected location. The numerical simulation produces a good match with the photograph for a droplet radius of 0.46 mm. The green band of the quinary rainbow is even faintly discernible in the unprocessed photograph, suggesting that under exceptional viewing conditions the green band of the quinary rainbow may be observed visually with the aid of a polarization filter. © 2014 Optical Society of America.

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