Analysis and correlation of the test data from an advanced technology rotor system

Comparisons were made of the performance and blade vibratory loads characteristics for an advanced rotor system as predicted by analysis and as measured in a 1/5 scale model wind tunnel test, a full scale model wind tunnel test and flight test. The accuracy with which the various tools available at the various stages in the design/development process (analysis, model test etc.) could predict final characteristics as measured on the aircraft was determined. The accuracy of the analyses in predicting the effects of systematic tip planform variations investigated in the full scale wind tunnel test was evaluated

Geographies of digital skill.

In an era of rapid technological change, especially considering the rise of robotics and AI, there is widespread anxiety about the impacts of digital technologies across a vast range of industries. Policy responses to this changing employment landscape champion the necessity for growing ‘digital skills’. However, we argue that these dominant macropolitical interpretations draw on a restricted understanding of spatiality where digital skills are discretely located in particular bodies and in particular geographical locations. The paper develops a novel geographical response through an exploration of the micropolitics of digital skills. This focuses on the material and practical dimensions of work with digital technologies that produces a more dynamic spatiality and thus a more complex politics of labour. We argue that the dynamic spatiality of digital skills can be evaluated according to: (1) site-specific dimensions, as digital skills are co-minglings of humans and technologies; (2) extensive dimensions, as digital skills are networked across geographically dispersed sites; and (3) intensive dimensions, as digital skills emerge across bodies and environments through repetitive practices. This analysis suggests that policy declarations of digital skills ‘shortages’ are problematic, since they overlook the contested and shifting forms of enablement and constraint that labour practices involving digital technologies give rise to. Unpacking this labour politics therefore requires geographical approaches that are adept at grasping these complex spatialities of labour

Geographies of digital skill

In an era of rapid technological change, especially considering the rise of robotics and AI, there is widespread anxiety about the impacts of digital technologies across a vast range of industries. Policy responses to this changing employment landscape champion the necessity for growing ‘digital skills’. However, we argue that these dominant macropolitical interpretations draw on a restricted understanding of spatiality where digital skills are discretely located in particular bodies and in particular geographical locations. The paper develops a novel geographical response through an exploration of the micropolitics of digital skills. This focuses on the material and practical dimensions of work with digital technologies that produces a more dynamic spatiality and thus a more complex politics of labour. We argue that the dynamic spatiality of digital skills can be evaluated according to: (1) site-specific dimensions, as digital skills are co-minglings of humans and technologies; (2) extensive dimensions, as digital skills are networked across geographically dispersed sites; and (3) intensive dimensions, as digital skills emerge across bodies and environments through repetitive practices. This analysis suggests that policy declarations of digital skills ‘shortages’ are problematic, since they overlook the contested and shifting forms of enablement and constraint that labour practices involving digital technologies give rise to. Unpacking this labour politics therefore requires geographical approaches that are adept at grasping these complex spatialities of labour

Low-speed inducers for cryogenic upper-stage engines

Two-phase, low-speed hydrogen and oxygen inducers driven by electric motors and applicable to the tug engine were designed and constructed. The oxygen inducer was tested in liquid and two-phase oxygen. Its head and flow performance were approximately as designed, and it was able to accelerate to full speed in 3 seconds and produce its design flow and head. The analysis of the two-phase data indicated that the inducer was able to pump with vapor volume fractions in excess of 60 percent. The pump met all of its requirements (duration of runs and number of starts) to demonstrate its mechanical integrity

PARENCHYMAL CELLS FROM ADULT RAT LIVER IN NONPROLIFERATING MONOLAYER CULTURE : I. Functional Studies

Parenchymal cells from adult rat liver have been established in primary monolayer culture. Donor animals are subjected to a partial hepatectomy and, 4 days later, cells are prepared by collagenase perfusion of the regenerated liver. The hepatic parenchymal cells, separated from nonparenchymal material and suspended in serum-free medium, are placed in plastic tissue culture dishes, where they form a monolayer within 24 h. The monolayer cells exhibit minimal mitotic activity and demonstrate several major metabolic functions characteristic of liver in vivo; these include albumin synthesis and secretion, gluconeogenesis from 3-carbon precursors, responsiveness to insulin and glucagon, glycogen synthesis, and activity of two microsomal enzymes. These functions are present in the monolayer cells for several days at activities similar to those observed in the liver in vivo. The findings indicate that hepatic parenchymal cells in this monolayer system are viable and behave in many respects like normal adult rat liver