61 research outputs found
Evaluating the Use of Tribocharging in the Electrostatic Beneficiation of Lunar Simulant
Any future lunar base needs materials to provide thermal and radiation protection. Many factors point to the use of lunar materials as industrial feedstocks. Sintering of full-scale bricks using whole lunar dust has been accomplished. Refinement of soil beneficial before processing means less energy. Triboelectric separation of coal from minerals, quartz from feldspar, and phosphorous from silica and iron ore successively achieved. The Lunar environment ideal for electrostatic separation (1) lack of moisture (2) lower gravitational pull (3) higher voltages in vacuu
Mauna Kea, Hawaii as an Analogue Site for Future Planetary Resource Exploration: Results from the 2010 ILSO-ISRU Field-Testing Campaign
Within the framework of the International Lunar Surface Operation - In-Situ Resource Utilization Analogue Test held on January 27 - February 11, 2010 on the Mauna Kea volcano in Hawaii, a number of scientific instrument teams collaborated to characterize the field site and test instrument capabilities outside laboratory environments. In this paper, we provide a geological setting for this new field-test site, a description of the instruments that were tested during the 2010 ILSO-ISRU field campaign, and a short discussion for each instrument about the validity and use of the results obtained during the test. These results will form a catalogue that may serve as reference for future test campaigns. In this paper we provide a description and regional geological setting for a new field analogue test site for lunar resource exploration, and discuss results obtained from the 2010 ILSO-ISRU field campaign as a reference for future field-testing at this site. The following instruments were tested: a multispectral microscopic imager, MMI, a Mossbauer spectrometer, an evolved gas analyzer, VAPoR, and an oxygen and volatile extractor called RESOLVE. Preliminary results show that the sediments change from dry, organic-poor, poorly-sorted volcaniclastic sand on the surface, containing basalt, iron oxides and clays, to more water- and organic-rich, fine grained, well-sorted volcaniclastic sand, primarily consisting of iron oxides and depleted of basalt and clays. Furthermore, drilling experiments showed a very close correlation between drilling on the Moon and drilling at the test site. The ILSO-ISRU test site was an ideal location for testing strategies for in situ resource exploration at the lunar or martian surface
First Measurement of the Total Neutron Cross Section on Argon Between 100 and 800 MeV
We report the first measurement of the neutron cross section on argon in the
energy range of 100-800 MeV. The measurement was obtained with a 4.3-hour
exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. The total
cross section is measured from the attenuation coefficient of the neutron flux
as it traverses the liquid argon volume. A set of 2,631 candidate interactions
is divided in bins of the neutron kinetic energy calculated from time-of-flight
measurements. These interactions are reconstructed with custom-made algorithms
specifically designed for the data in a time projection chamber the size of the
Mini-CAPTAIN detector. The energy averaged cross section is . A comparison
of the measured cross section is made to the GEANT4 and FLUKA event generator
packages.Comment: 5 pages, 1 table, 3 figures, submitted to Physical Review Letter
The Mini-CAPTAIN Liquid Argon Time Projection Chamber
This manuscript describes the commissioning of the Mini-CAPTAIN liquid argon
detector in a neutron beam at the Los Alamos Neutron Science Center (LANSCE),
which led to a first measurement of high-energy neutron interactions in argon.
The Mini-CAPTAIN detector consists of a Time Projection Chamber (TPC) with an
accompanying photomultiplier tube (PMT) array sealed inside a
liquid-argon-filled cryostat. The liquid argon is constantly purified and
recirculated in a closed-loop cycle during operation. The specifications and
assembly of the detector subsystems and an overview of their performance in a
neutron beam are reported.Comment: 21 pages, 27 figure
Was it Uruguay or Coffee? The causes of the beef jerky industry’s decline in southern Brazil (1850 – 1889)
What caused the decline of the beef jerky’s production in Brazil? The main sustenance for slaves, beef jerky was the most important industry in southern Brazil. Nevertheless, by 1850, producers were already worried that they could not compete with Uruguayan industry. Traditional interpretations impute the decline to labor markets differences in productivity, since Brazil used slaves while Uruguay had abolished slavery in 1842. Recent research also raises the possibility of a Brazilian “Dutch Disease”, resulting from the coffee exports boom. We test both hypothesis and argue that Brazilian production’s decline was associated with structural changes in demand for low quality meat. Trade protection policies created disincentives for Brazilian producers to increase productivity and diversify its cattle industry
Founders of marine science in Britain: the work of the early Fellows of the Royal Society
The true copie of a letter written by Captain Wingate, now prisoner in Ludlow, taken by the malignant partie, in the late battaile fought at Worcester, and sent to a member of the Hoble house of Commons. Setting forth the inhumane, barbarous and savage cruelties towards him, and how he was compelled to ride through the army naked: with his resolution to die in the Parliaments cause. Whereunto is added the Kings Majesties speech at Shrewsbury, on Michaelmas Eve last, to the gentry and commons of the county of Sallop, there assembled.
A petition from the towne and county of Leicester, unto the Kings most excellent Majesty. Also an other petition from the grand inquest of the same county unto his Majesty for the remouing of the magazine with his Majesties answer thereunto. Likewise certain propositions to his Majesty by Captain Grey and the Earl of Stamfords souldiers touching the magazin. Also a declaration from the knights, es-quires, gentlemen, grand jury-men, and free-holders, in the county of Leicester. Ordered to be printed by speciall command.
A Petitjon [sic] from the towne and county of Leicester unto the Kings most excellent Majesty. Also an other petition from the grand inquest of the same county unto his Majesty for the remouing of the magazine. : With his Majesties answer therewith. : Likewise certain propositions to his Majesty by Captain Grey and the Earl of Stamfords souldiers touching the magazin. : Also a declaration from the knights, esquires, gentlemen, grand iury-men, and free-holders, in the county of Leicester.
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