29,414 research outputs found
Education and Legislation: Affluent Women\u27s Political Engagement in the Consumers\u27 Leagues of the Progressive Era
This paper examines the extent to which the National Consumers’ League and similar localized leagues provided middle- and upper-class women with new opportunities for involvement in American politics during the early Progressive Era, or roughly the last decade of the nineteenth century and the first decade of the twentieth. These organizations undertook various efforts – including “list” and “label” campaigns – to educate the consuming public about the poor working conditions suffered by retail employees and especially factory workers in the garment industry, with a focus on employed women and child laborers. Later on, the leagues provided their female members with important opportunities for extensive political involvement as a more direct means of achieving their goals, including lobbying state legislators and preparing amicus curiae briefs for state courts and even the U.S. Supreme Court in the landmark case known as Muller v. Oregon (1908). Through these efforts, the leagues earned a significant amount of attention from other Progressive reform-minded organizations, including the Russell Sage Foundation
The X-beam as a deployable boom for the space station
Extension of antennas and thrust modules from the primary structure of the space station will require deployable beams of high stiffness and strength, as well as low mass and package volume. A square boom cross section is desirable for interface reasons. These requirements and others are satisfied by the X-beam. The X-beam folds by simple geometry, using single-degree-of-freedom hinges at simple angles, with no strain during deployment. Strut members are of large diameter with unidirectional graphite fibers for maximum beam performance. Fittings are aluminum with phosphor bronze bushings so that compliance is low and joint lifetime is high. The several beam types required for different applications on the space station will use the same basic design, with changes in strut cross section where necessary. Deployment is by a BI-STEM which pushes the beam out; retraction is by cables which cause initial folding and pull the beam in
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Strategies, contributions and inhibitors of information systems to organizational competitiveness: An empirical analysis within the Caribbean
The study examines the impact of Information Systems (IS) through a consideration of improved competitiveness within a multi-business Caribbean firm. The methodology draws on a participant-observer approach for data collection and compares the application of IS by three business units within each of three organizations. It is argued that while there is already a substantial amount of research on IS effectiveness its value in the context of developing countries such as those of the Caribbean will be most significant. In this context firms are perceived to face more constraints than in developed countries so there is a need to explicitly recognize the effects of ‘inhibitors’.
The study finds that for two of these businesses IS can be shown to have contributed to improved competitiveness, while the third had a less satisfactory experience. Analysis of the data revealed that in the two business units where IS contributed the units had been able to improve specific business processes in pursuit of identified competitive strategies. In the unit that did not derive such advantages, limitations in the functionality of the core application combined with insufficient adjustment of business processes, led to the unsatisfactory results. It is also observed that the explanatory value of the empirical analysis is enhanced if we identify inhibitors of IS for competitive advantage and make their effects more explicit
The ins and outs of metal homeostasis by the root nodule actinobacterium Frankia
Background: Frankia are actinobacteria that form a symbiotic nitrogen-fixing association with actinorhizal plants, and play a significant role in actinorhizal plant colonization of metal contaminated areas. Many Frankia strains are known to be resistant to several toxic metals and metalloids including Pb2+, Al+3, SeO2, Cu2+, AsO4, and Zn2+. With the availability of eight Frankia genome databases, comparative genomics approaches employing phylogeny, amino acid composition analysis, and synteny were used to identify metal homeostasis mechanisms in eight Frankia strains. Characterized genes from the literature and a meta-analysis of 18 heavy metal gene microarray studies were used for comparison.
Results: Unlike most bacteria, Frankia utilize all of the essential trace elements (Ni, Co, Cu, Se, Mo, B, Zn, Fe, and Mn) and have a comparatively high percentage of metalloproteins, particularly in the more metal resistant strains. Cation diffusion facilitators, being one of the few known metal resistance mechanisms found in the Frankia genomes, were strong candidates for general divalent metal resistance in all of the Frankia strains. Gene duplication and amino acid substitutions that enhanced the metal affinity of CopA and CopCD proteins may be responsible for the copper resistance found in some Frankia strains. CopA and a new potential metal transporter, DUF347, may be involved in the particularly high lead tolerance in Frankia. Selenite resistance involved an alternate sulfur importer (CysPUWA) that prevents sulfur starvation, and reductases to produce elemental selenium. The pattern of arsenate, but not arsenite, resistance was achieved by Frankia using the novel arsenite exporter (AqpS) previously identified in the nitrogen-fixing plant symbiont Sinorhizobium meliloti. Based on the presence of multiple tellurite resistance factors, a new metal resistance (tellurite) was identified and confirmed in Frankia.
Conclusions: Each strain had a unique combination of metal import, binding, modification, and export genes that explain differences in patterns of metal resistance between strains. Frankia has achieved similar levels of metal and metalloid resistance as bacteria from highly metal-contaminated sites. From a bioremediation standpoint, it is important to understand mechanisms that allow the endosymbiont to survive and infect actinorhizal plants in metal contaminated soils
Development and flight history of SERT 2 spacecraft
A 25-year historical review of the Space Electric Rocket Test 2 (SERT 2) mission is presented. The Agena launch vehicle; the SERT 2 spacecraft; and mission-peculiar spacecraft hardware, including two ion thruster systems, are described. The 3 1/2-year development period, from 1966 to 1970, that was needed to design, fabricate, and qualify the ion thruster system and the supporting spacecraft components, is documented. Major testing of two ion thruster systems and related auxiliary experiments that were conducted in space after the 3 Feb. 1970, launch are reviewed. Extended ion thruster restarts from 1973 to 1981 are reported, in addition to cross-neutralization tests. Tests of a reflector erosion experiment were continued in 1989 to 1991. The continuing performance of spacecraft subsystems, including the solar arrays, over the 1970-1991 period is summarized. Finally, the knowledge of thruster-spacecraft interactions learned from SERT 2 is listed
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