The mechanisms of the SAMS experiment flown on Nimbus 7 with particular reference to the 2 axis scanning mirror

The stratospheric and mesospheric sounder (SAMS) experiment on Nimbus 7 includes a 2 axis scanning mirror and 7 pressure modulator cells. The SAMS experiment is a limb sounding instrument to measure the temperature profile and minor constituents of the atmosphere. The limb scan requires small mirror steps over a 3 deg range, while the scan in azimuth is in larger steps over a 15 deg range. The mirror is plane, 20 cm in diameter, and of zero expansion glass-ceramic. It is supported on two tilt tables, fitted one on the other, with the axes at right angles. The angle of tilt is adjusted by means of recirculating ball screws which are ion plated with lead for lubrication and driven by stepper motors. The seven gas filled cells are each pressure modulated by a 3 cm diameter, 0.3 cm stroke piston which is supported by diaphragm springs and driven electromagnetically at the system's mechanical resonant frequency. The mean pressure of the filling gas, which is the atmospheric constituent being measured, is changed by varying the temperature of a suitable molecular sieve

Mechanisms of UK radiometers flown on Nimbus 5 and 6 with particular reference to bearings, pivots and lubrication

The mechanisms incorporated in the vertical sounding infrared radiometry experiments which were launched on Nimbus 5 in 1972 and on Nimbus 6 in 1975 are discussed. Both use dry lubricants. The Nimbus 5 radiometer includes a rotating chopper driven via a carbon fiber-acetal resin gearwheel. The driving motor runs at 2000 rpm and has completed over 7 x 10 to the 9th power revolutions. Four gear driven filter wheels powered by stepper motors have each completed 2 x 10 to the 8th power changes. The input calibration mirror mechanism and its field of view compensation mechanisms are also described. All 25 ball races used in the experiment are of the film transfer type. The Nimbus 6 radiometer includes two cells. Each contains a piston supported on diaphragm springs and driven electromagnetically. The pistons are 6 cm in diameter with a stroke of 1 cm and are driven at their mechanical resonant frequency of approx. 15 Hz. The calibrating mirrors rotate periodically to view a target. The support pivots are synthetic sapphire ring stones with separate end thrust stones. The problems of mounting these stones to withstand vibration loads is described

Warriors, heroes and companions: negotiating masculinity in Viking-Age England

Detailed analysis of the construction of gender identities has transformed our understanding of many aspects of early medieval society, yet the study of the Vikings in Britain has largely remained immune to this branch of scholarship. In responding to this lacuna, this paper examines the gendered dimension of the funerary record of the Scandinavians in England in the ninth and tenth centuries, and suggests that the emphasis on masculine display, in both the burial and the sculptural record, is not merely a quirk of survival, but rather it has much to reveal about the negotiation of lordship in the context of conquest and settlement

Challenging (mis)conceptions of Asianness in the work of Yumi Umiumare

Since migrating to Australia more than a decade ago, butoh dancer Yumi Umiumare has been interested in performing her Japanese identity ironically, making her own otherness part of an ongoing choreographic challenge to (mis)conceptions of Asianness in Australia. Her butoh-based choreography traverses her body’s outer and inner landscapes to simultaneously expose stereotypes of Asianness, and explore the physical processes constrained by these stereotypes. Umiumare’s strategic performance of stereotypes is risky, readily collapsed back into the culturally ordained images of otherness she is trying to challenge. Nevertheless, Umiumare clearly believes this strategy is the most effective way of making the otherness she experiences as a Japanese woman living in Western society palpable for her largely white audiences, making them uncomfortable with the (mis)conceptions they hold. This strategy is central to How Could You Even Begin To Understand? Version 9-12, the small scale traverse stage performance I consider in this paper

Anne Bogart, and then, you act : making art in an unpredictable world

Review of Anne Bogart's 2007 'And then, you act: making art in an unpredictable world

MS-091: Women’s Student Government Association Papers

This collection consists of the early Constitution of the Women’s Student Government Association, a Record Book containing minutes from the late 1940’s to early 1950’s, and some early correspondence. The remainder contains minutes from 1965 to 1971, with gaps in between, and documents pertaining to the activities and actions of the Women’s Student Government Council.https://cupola.gettysburg.edu/findingaidsall/1083/thumbnail.jp