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- Sprague, A. L., et al.
(författare)
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Mercury: Near Infrared Spectroscopy with SpeX
- 2003
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Ingår i: American Astronomical Society, DPS meeting #35, #23.07. ; , s. 2307-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We report long slit, spatially resolved, high resolving power spectroscopy of Mercury's surface for longitudes 260 - 320 degrees. Spectra extend from 0.8 - 5.0 micrometers. Spectral features indicative of common silicate materials are found. There are var
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| 2. |
- Ölvander, J., et al.
(författare)
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Preface
- 2018
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Ingår i: Proceedings of NordDesign. - Linköping : Design Research Society. - 9789176851852
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Konferensbidrag (populärvet., debatt m.m.)
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| 3. |
- Ölvander, J., et al.
(författare)
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Preface
- 2018
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Ingår i: Proceedings of NordDesign. - : The Design Society.
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Konferensbidrag (refereegranskat)
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| 8. |
- Pohl, J, et al.
(författare)
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Conceptual Design of a Hydraulic Valve Train System
- 2001
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Ingår i: Acta Polytechnica - Czech Technical University in Prague. - 1210-2709. ; 41:4/5, s. 20-28
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Tidskriftsartikel (refereegranskat)abstract
- Variable valve train systems have been brought into focus during recent years as a means to decrease fuel consumption in tomorrow’s combustion engines. In this paper an integrated approach, called simulation driven experiments, is utilised in order to aid the development of such highly dynamic systems. Through the use of systematic design methodology, a number of feasible concepts are developed. Critical components are subsequently identified using simulation. In this approach, component behaviour is simulated and validated by measurements on prototype components. These models are unified with complete system models of hydraulically actuated valve trains. In the case of the valve trains systems studied here component models could be validated using comparably simple test set-ups. These models enable the determination of non-critical design parameters in an optimal sense. This results in a number of optimised concepts facilitating an impartial functional concept selection.
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| 9. |
- Sprague, A. L., et al.
(författare)
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Mercury: First Spectra from 0.7 to 5.5 µm Support Low FeO and Feldspathic Composition
- 2004
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Ingår i: 35th Lunar and Planetary Science Conference. ; , s. 1630-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Spectral measurements of Mercury's surface show an absence of absorptions centered near 0.9 and 1.2 micrometers. At the Moon these absorption bands are ubiquitous at varying depths. We have obtained spectra from the Moon for comparison. The lunar results
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| 10. |
- Sprague, A. L., et al.
(författare)
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Spectral emissivity measurements of Mercury's surface indicate Mg- and Ca-rich mineralogy, K-spar, Na-rich plagioclase, rutile, with possible perovskite, and garnet
- 2009
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Ingår i: Planetary and Space Science. - : Elsevier BV. - 0032-0633 .- 1873-5088. ; 57:3, s. 364-383
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Tidskriftsartikel (refereegranskat)abstract
- Mid-infrared 2-D spectroscopic measurements from 8.0 to 12.7 gm of Mercury were taken using Boston University's Mid-Infrared Spectrometer and Imager (MIRSI) mounted on the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii, 7-11 April 2006. Measurements reported here cover radar bright region C, a dark plains region west of Caloris Basin, and the interior of Caloris Basin. By use of spectral deconvolution with a large spectral library composed of many mineral compositions and grain size separates, we fitted, or "unmixed", the Mercury spectra. We find mineral suites composed of magnesium-rich orthopyroxene and olivine, Ca-, Mg-, Na-rich clinopyroxene, potassium feldspar, and Na-bearing plagioclase feldspar. Both Ca- and Mg-rich garnet (pyrope and grossular, respectively) are apparently present in small amounts. Opaque minerals are required for spectral matching, with rutile (TiO2) repeatedly providing the "best fit". However, in the case of the radar bright region C, perovskite also contributed to a very good fit. Caloris Basin infill is rich in both potassium feldspar and Na-rich plagioclase. There is little or no olivine in the Caloris interior smooth plains. Together with the high alkali content, this indicates that resurfacing magmas were low to intermediate in SiO2. Data suggest the dark plains exterior to Caloris are highly differentiated low-iron basaltic magmas resulting in material that might be classified as oligorclase basalts. (C) 2009 Elsevier Ltd. All rights reserved
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