6,168 research outputs found

    A Ground-based Search for Lunar Resources Using High-resolution Imaging in the Infrared

    Get PDF
    When humans return to the Moon, lunar resources will play an important role in the successful deployment and maintenance of the lunar base. Previous studies have illustrated the abundance of resource materials available on the surface of the Moon, as well as their ready accessibility. Particularly worth considering are the lunar regional (2,000-30,000 sq km) pyroclastic deposits scattered about the lunar nearside. These 30-50-m-thick deposits are composed of fine-grained unconsolidated titanium- and iron-rich mafic glasses and may be used as bulk feedstock for the beneficiation of oxygen, iron, titanium, sulfur, and other solar wind gases, or simply used as is for construction and shielding purposes. A groundbased observing survey of the resource-rich regions on the lunar nearside using a new imaging technique designed to obtain much higher resolution images, and more precise compositional analyses than previously obtainable is proposed

    Preliminary results of geologic and remote sensing studies of Rima Mozart

    Get PDF
    In order to better understand the processes responsible for the formation of lunar sinuous rilles, a study of Rima Mozart was conducted using a variety of geologic, photographic, and remote sensing data. The apparent source of this rille is located in a highlands unit of known composition and it is hypothesized that thermal and mechanical erosion played an important role in the formation of Rima Mozart. Excellent photographic, topographic, multispectral, and radar data exist for this rille. The preliminary results of an analysis of this data are presented. Photographic data indicates the presence of two volcanic source vents for Rima Mozart: Kathleen and Ann. It is suggested that Rima Mozart, like many other lunar sinuous rilles, was most likely formed by a combination of events. Rima Mozart does follow a pre-existing, dominant NW/SE structural trend suggesting the influence of structural features on the rille, however, the tectonic influence is not the sole source for the formation of the rille, as suggested by the presence of the two source vents and the spatter around Ann. It is suggested that the rille formation began with an explosive eruption at Kathleen which later calmed down to a pulsating, high volume, low-viscosity lava flow. The rapid effusion rate of the magma as well as its high temperature and turbid nature helped carve the sinuous rille into the fractured and structurally weak Apennine Bench Formation underneath. Similar eruptions and subsequent flows were also created at Ann and joined to the main channel by a NE-trending secondary rille

    Building the machine : The development of slavery and slave society in early colonial Virginia

    Get PDF
    Historians have, of course, long been aware of the importance of Virginia\u27s seventeenth-century conversion from white to black labor. But while scholars have devoted considerable effort to explaining why this pivotal transition occurred, a detailed analysis of how it happened does not exist, nor by extension have scholars ever fully considered the repercussions of what one might call the process of conversion. ;Although Virginia\u27s black population remained small throughout much of the seventeenth century, it was heavily concentrated on the estates of a relatively small circle of wealthy planters. By the middle decades of the century some members of the gentry had acquired sizable quantities of slaves. as early as the 1660s, when the typical Chesapeake planter still only employed servants, on many elite plantations blacks made up nearly half of the workforce, and in some cases were numerous enough to comprise a considerable majority.;The gentry\u27s early turn to slavery had a profound effect on the development of the plantation machine. From a socio-economic perspective, it was instrumental in facilitating the rise of Virginia\u27s great families. The founding members of these dynasties arrived in the colony with wealth and social status. But it was their remarkable success in building up their holdings in land and slaves that distanced them from their peers and that proved decisive in securing the lasting predominance of their descendants.;Yet because of their limited access to the transatlantic slave trade, even the wealthiest Virginians initially found it difficult to procure slaves and for decades elite-owned labor forces remained racially mixed. Early African immigrants consequently faced enormous pressure to conform to the behavioral norms of the dominant Anglo-American society, giving the cultural compromises that they ultimately reached with each other an assimilationist bent. as the founding generations relinquished community leadership to their native-born children and grandchildren, African-American society in the colony acquired an anglicized veneer that continued to persist and shape life in slave quarters even after the advent of large direct deliveries in the early eighteenth century

    Alien Registration- Coombs, C A. (Baldwin, Cumberland County)

    Get PDF
    https://digitalmaine.com/alien_docs/33012/thumbnail.jp

    On the Use of Objective Examinations

    Full text link
    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67984/2/10.1177_001316445301300214.pd
    • 

    corecore