142,543 research outputs found
A. H. Powlee
No full textPortrait of A. H. Powlee at Senior Citizens" party at the Mosier Valley Community Cente
Ollie Farrow, Robert Blackburn, and A. H. Plwlee
No full textOllie Farrow, Robert Blackburn, and A. H. Powlee and others socializing at the Senior Citizens' Party at the Mosier Valley Community Cente
Mrs. A. H. Powlee
No full textMrs. A.H. Powlee in the library at the Mosier Valley Senior Citizens' Center
Clustering in ICT: From Route 128 to Silicon Valley, from DEC to Google, from Hardware to Content
No full textOne of the pioneers in academic entrepreneurship and high-tech clustering is MIT and the Route 128/Boston region. Silicon Valley centered around Stanford University was originally a fast follower and only later emerged as a scientific and industrial hotspot. Several technology and innovation waves, have shaped Silicon Valley over all the years. The initial regional success of Silicon Valley started with electro-technical instruments and defense applications in the 1940s and 1950s (represented by companies as Litton Engineering and Hewlett & Packard). In the 1960s and 1970s, the region became a national and international leader in the design and production of integrated circuit and computer chips, and as such became identified as Silicon Valley (e.g. Fairchild Semiconductor, and Intel). In the 1970s and 1980s, Silicon Valley capitalised further on the development, manufacturing and sales of the personal computer and workstations (e.g. Apple, Silicon Graphics and SUN), followed by the proliferation of telecommunications and Internet technologies in the 1990s (e.g. Cisco, 3Com) and Internet-based applications and info-mediation services (e.g. Yahoo, Google) in the late 1990s and early 2000s. When the external and/or internal conditions of its key industries change, Silicon Valley seemed to have an innate capability to restructure itself by a rapid and frequent reshuffling of people, competencies, resources and firms. To characterise the demise of one firm leading, directly or indirectly, to the formation of another and the reconfiguration of business models and product offerings by the larger companies in emerging industries, Bahrami & Evans (2000) introduced the term `flexible recycling.’ This dynamic process of learning by doing, failing and recombining (i.e. allowing new firms to rise from the ashes of failed enterprises) is one of the key factors underlying the dominance of Silicon Valley in the new economy.ICT;Clusters;Networks;Academic entrepreneurship;MIT;Silicon Valley;Stanford University;Flexible recycling;Route 128
Proglacial sedimentation of late Wisconsin age in Miers Valley, Antarctica
No full textMiers Valley is an ice free valley in the Koettlitz Region of Victoria Land, Antarctica. The eastern basin of this valley has extensive coverage of gypsum and laminated calcite overlying fine silts and sands, while Lake Miers occupies the western basin. Mapping of the surficial sediments has shown that a proglacial lake at least 80m deep extended up the valley (Glacial Lake Trowbridge), dammed to the east by a glacial tongue extending from the coast, C-14 and U/Th dating of the lacustrine carbonates has shown that this lake occupied Miers Valley between 10,000 and 20,000 yrs BP and was at its maximum between 18,000 and 19,000 yrs BP.
Dating of individual lamina has shown that calcite deposition was not continuous, but proceeded in at least three pulses. This is supported by stable isotope analyses which show an enrichment in ¹⁸O with time, suggesting the possible concentration through evaporation of ¹⁸O during the lake's history. Impressions within the calcite plates indicate that a crystalline material, possibly gypsum, was crystallizing contemporaneously with the calcite. This salt was subsequently flushed from the system on the draining of the eastern basin. At the final stages of occupation, large quantities of gypsum were deposited into the eastern basin from the glacier terminus and draining of the lake resulted in a surface coverage of gypsum throughout the eastern basin.
Shallow mounds of coarse basalt rich drift overlie the carbonate, gypsum and silt beds in places throughout the eastern basin. On the surface ice cover of Lake Miers, similar mounds occur. The ice beneath these mounds is virtually sediment free and the sediment on the surface differs from that on the lake bed. It is suggested that the mounds on the ice raft and the mounds in the eastern basin share a common origin. Supraglacial and englacial sediments carried into the valley with the Ross Ice Tongue were deposited onto the floating ice cover of Glacial Lake Trowbridge. This material was then rafted across the valley as the lake ice was pushed forward by ice fed from the glacial tongue. The sediments remained supported on the lake until they reached the annual melt out moat or the lake drained. They were then deposited on top of the lacustrine sediments, thereby preserving them (as occurred in the eastern basin), or in the case of the western basin a lake remained so the mounds were preserved on the ice cover which had then become immobile.
Once the proglacial lake drained, most of the lacustrine sediments were then exposed to the environment. Scanning Electron Microscope studies have shown that the exposed lacustrine carbonates have undergone chemical weathering. These carbonates are pitted and weathered compared to much older and less exposed carbonates in neighbouring Marshall Valley
Ceramics and coins in the Middle Tiber valley from fifth to the tenth centuries AD
No full textThis paper uses the evidence (H. Patterson) and coins (A. Rovelli) to examine social and economic developments in Rome and the middle Tiber valley during the late Roman and early medieval perods. It explores their potential for evaluating the effects of the decline of Rome's power on its hinterland and the impact of the emergence of new forms of power on local economic dynamics
Dr. W. H. Hopkins and Navajo Hogan, Monument Valley, 1916
No full text"Dr. W. H. Hopkins and Navajo Hogan, Monument Valley". Monuments in the background
High-Technology Entrepreneurship in Silicon Valley
No full textThe economic expansion of the late 1990s created many opportunities for business creation in Silicon Valley, but the opportunity cost of starting a business was also high during this period because of the exceptionally tight labor market. A new measure of entrepreneurship derived from matching files from the Current Population Survey (CPS) is used to provide the first test of the hypothesis that business creation rates were high in Silicon Valley during the "Roaring 90s." Unlike previous measures of firm births based on large, nationally representative datasets, the new measure captures business creation at the individual-owner level, includes both employer and non-employer business starts, and focuses on only hi-tech industries. Estimates indicate that hi-tech entrepreneurship rates were lower in Silicon Valley than the rest of the United States during the period from January 1996 to February 2000. Examining the post-boom period, we find that entrepreneurship rates in Silicon Valley increased from the late 1990s to the early 2000s. Although Silicon Valley may be an entrepreneurial location overall, we provide the first evidence that the extremely tight labor market of the late 1990s, especially in hi-tech industries, may have suppressed business creation during this period.entrepreneurship, high-technology, Silicon Valley, economic geography, regional clusters
Inter-Epidemic Transmission of Rift Valley Fever in\ud Livestock in the Kilombero River Valley, Tanzania:\ud A Cross-Sectional Survey
No full textIn recent years, evidence of Rift Valley fever (RVF) transmission during inter-epidemic periods in parts of Africa has increasingly been reported. The inter-epidemic transmissions generally pass undetected where there is no surveillance in the livestock or human populations. We studied the presence of and the determinants for inter-epidemic RVF transmission in an area experiencing annual flooding in southern Tanzania. A cross-sectional sero-survey was conducted in randomly selected cattle, sheep and goats in the Kilombero river valley from May to August 2011, approximately four years after the 2006/07 RVF outbreak in Tanzania. The exposure status to RVF virus (RVFV) was determined using two commercial ELISA kits, detecting IgM and IgG antibodies in serum. Information about determinants was obtained through structured interviews with herd owners. An overall seroprevalence of 11.3% (n = 1680) was recorded; 5.5% in animals born after the 2006/07 RVF outbreak and 22.7% in animals present during the outbreak. There was a linear increase in prevalence in the post-epidemic annual cohorts. Nine inhibition-ELISA positive samples were also positive for RVFV IgM antibodies indicating a recent infection. The spatial distribution of seroprevalence exhibited a few hotspots. The sex difference in seroprevalence in animals born after the previous epidemic was not significant (6.1% vs. 4.6% for females and males respectively, p = 0.158) whereas it was significant in animals present during the outbreak (26.0% vs. 7.8% for females and males respectively, p,0.001). Animals living .15 km from the flood plain were more likely to have antibodies than those living ,5 km (OR 1.92; 95% CI 1.04–3.56). Species, breed, herd composition, grazing practices and altitude were not associated with seropositivity. These findings indicate post-epidemic transmission of RVFV in the study area. The linear increase in seroprevalence in the post-epidemic annual cohorts implies a constant exposure and presence of active foci transmission preceding the survey
Bear Valley C&H
No full textBear Valley C&H Bear Valley North Riparian Pasture.https://digscholarship.unco.edu/lowman_1991/1004/thumbnail.jp
- …
