New Carquinez Bridge, Northeast of San Francisco, California: Technological Design Advancements

Author(s):  
Thomas Spoth ◽  
Dyab Khazem ◽  
Gregory I. Orsolini

The new Carquinez Strait Bridge, northeast of San Francisco, California, will be the first major suspension bridge to be constructed in the United States since the second Chesapeake Bay Bridge in Maryland in 1973. It will replace an existing steel cantilever truss bridge, built in 1927, that was found to be seismically inadequate. The new bridge consists of an orthotropic closed steel box girder superstructure, two main cables 512 mm (20 1/8 in.) in diameter, reinforced concrete towers, and gravity anchorages. The design has set a new standard in modern suspension bridge design in the United States, particularly with respect to seismic safety. Some of the key elements of the design that are discussed are the global design loading criteria for long-span suspension bridges, the design of allowable stresses in main cable wire, the state-of-the-art design detailing of critical welded connections, the finite-element analysis approach for the box girder to determine the actual plate stresses and stress concentrations, and the design of the reinforced concrete tower leg sections for enhanced ductile seismic performance.

2020 ◽  
pp. 283-318
Author(s):  
Richard Haw

Between 1847 and 1852, John built four separate aqueducts for the Delaware and Hudson Canal; moved his home, family, and wire rope factory from western Pennsylvania to Trenton, New Jersey; secured the contract to build a huge railroad bridge over the Kentucky River; and continued to mount substantial campaigns to win contracts to span the Ohio at Wheeling and the Niagara Gorge. The four D&H spans were mini masterpieces of engineering and planning. Each structure was very different; each required new solutions to site-specific problems. One of the spans, the Delaware Aqueduct, exists to this day, the oldest suspension bridge in the United States and one of the oldest “modern” suspension bridges in the world. On the larger projects, John again lost out to his old rival Ellet on both the Wheeling and the Niagara spans.


2018 ◽  
Vol 95 (2) ◽  
pp. 52-70
Author(s):  
Stephen Mikesell

Andrew Smith Hallidie (1836–1900) played a central role in the development of the suspension bridge, not only in California but across the United States. While Hallidie did not invent the suspension bridge, he made improvements in the manufacture of iron and steel cables for such bridges. He also built at least eight substantial bridges, all in remote regions of California and elsewhere in the late 1850s and early 1860s. He made a meaningful contribution to the transportation history of the Mother Lode, building bridges that were able to withstand the ferocious floods that decimated the region during the early 1860s.


2020 ◽  
Vol 20 (2) ◽  
pp. 45-54
Author(s):  
Samuel H. Yamashita

In the 1970s, Japanese cooks began to appear in the kitchens of nouvelle cuisine chefs in France for further training, with scores more arriving in the next decades. Paul Bocuse, Alain Chapel, Joël Robuchon, and other leading French chefs started visiting Japan to teach, cook, and sample Japanese cuisine, and ten of them eventually opened restaurants there. In the 1980s and 1990s, these chefs' frequent visits to Japan and the steady flow of Japanese stagiaires to French restaurants in Europe and the United States encouraged a series of changes that I am calling the “Japanese turn,” which found chefs at fine-dining establishments in Los Angeles, New York City, and later the San Francisco Bay Area using an ever-widening array of Japanese ingredients, employing Japanese culinary techniques, and adding Japanese dishes to their menus. By the second decade of the twenty-first century, the wide acceptance of not only Japanese ingredients and techniques but also concepts like umami (savory tastiness) and shun (seasonality) suggest that Japanese cuisine is now well known to many American chefs.


2020 ◽  
pp. 089692052098012
Author(s):  
Els de Graauw ◽  
Shannon Gleeson

National labor unions in the United States have formally supported undocumented immigrants since 2000. However, drawing on 69 interviews conducted between 2012 and 2016 with union and immigrant rights leaders, this article offers a locally grounded account of how union solidarity with undocumented immigrants has varied notably across the country. We explore how unions in San Francisco and Houston have engaged with Obama-era immigration initiatives that provided historic relief to some undocumented immigrants. We find that San Francisco’s progressive political context and dense infrastructure of immigrant organizations have enabled the city’s historically powerful unions to build deep institutional solidarity with immigrant communities during the Deferred Action for Childhood Arrivals (DACA [2012]) and Deferred Action for Parents of Americans (DAPA [2014]) programs. Meanwhile, Houston’s politically divided context and much sparser infrastructure of immigrant organizations made it necessary for the city’s historically weaker unions to build solidarity with immigrant communities through more disparate channels.


2021 ◽  
Author(s):  
Anthony D Mancini ◽  
Gabriele Prati

How does the prevalence of COVID-19 impact people’s mental health? In a preregistered study (N = 857), we sought to answer this question by comparing demographically matched samples in four regions in the United States and Italy with different levels of cumulative COVID-19 prevalence. No main effect of prevalence emerged. Rather, prevalence region had opposite effects, depending on the country. New York City participants (high prevalence) reported more general distress, PTSD symptoms, and COVID-19 worry than San Francisco (low prevalence). Conversely, Campania participants (low prevalence) reported more general distress, PTSD symptoms, and COVID-19 worry than Lombardy (high prevalence). Consistent with these patterns, COVID-19 worry was more strongly linked with general distress and PTSD symptoms in New York than San Francisco, whereas COVID-19 worry was more strongly linked with PTSD in Campania than Lombardy. In exploratory analyses, media exposure predicted and mapped on to geographic variation in mental health outcomes.


2020 ◽  
Author(s):  
Brett R. Bayles ◽  
Michaela F George ◽  
Haylea Hannah ◽  
Patti Culross ◽  
Rochelle R. Ereman ◽  
...  

Background: The first shelter-in-place (SIP) order in the United States was issued across six counties in the San Francisco Bay Area to reduce the impact of COVID-19 on critical care resources. We sought to assess the impact of this large-scale intervention on emergency departments (ED) in Marin County, California. Methods: We conducted a retrospective descriptive and trend analysis of all ED visits in Marin County, California from January 1, 2018 to May 4, 2020 to quantify the temporal dynamics of ED utilization before and after the March 17, 2020 SIP order. Results: The average number of ED visits per day decreased by 52.3% following the SIP order compared to corresponding time periods in 2018 and 2019. Both respiratory and non-respiratory visits declined, but this negative trend was most pronounced for non-respiratory admissions. Conclusions: The first SIP order to be issued in the United States in response to COVID-19 was associated with a significant reduction in ED utilization in Marin County.


2005 ◽  
Vol 11 (1) ◽  
pp. 26-35
Author(s):  
Kalafi Moala

"The largest number of Tongans outside of Tonga lives in the United States. It is estimated to be more than 70,000; most live in the San Francisco Bay Area. On several occasions during two visits to the US by my wife and I during 2004, we met workers who operate the only daily Tongan language radio programmes in San Francisco. Our organisation supplies the daily news broadcast for their programmes. Our newspapers— in the Tongan and Samoan languages— also sell in the area. The question of what are the fundamental roles of the media came up in one of our discussions..."


2018 ◽  
Vol 129 (5) ◽  
pp. 1342-1348 ◽  
Author(s):  
Patrick M. Flanigan ◽  
Arman Jahangiri ◽  
Joshua L. Golubovsky ◽  
Jaret M. Karnuta ◽  
Francis J. May ◽  
...  

OBJECTIVEThe position of neurosurgery department chair undergoes constant evolution as the health care landscape changes. The authors’ aim in this paper was to characterize career attributes of neurosurgery department chairs in order to define temporal trends in qualities being sought in neurosurgical leaders. Specifically, they investigated the hypothesis that increased qualifications in the form of additional advanced degrees and research acumen are becoming more common in recently hired chairs, possibly related to the increased complexity of their role.METHODSThe authors performed a retrospective study in which they collected data on 105 neurosurgeons who were neurosurgery department chairs as of December 31, 2016, at accredited academic institutions with a neurosurgery residency program in the United States. Descriptive data on the career of neurosurgery chairs, such as the residency program attended, primary subspecialty focus, and age at which they accepted their position as chair, were collected.RESULTSThe median age and number of years in practice postresidency of neurosurgery chairs on acceptance of the position were 47 years (range 36–63 years) and 14 years (range 6–33 years), respectively, and 87% (n = 91) were first-time chairs. The median duration that chairs had been holding their positions as of December 31, 2016, was 10 years (range 1–34 years). The most common subspecialties were vascular (35%) and tumor/skull base (27%), although the tendency to hire from these specialties diminished over time (p = 0.02). More recently hired chairs were more likely to be older (p = 0.02), have more publications (p = 0.007), and have higher h-indices (p < 0.001) at the time of hire. Prior to being named chair, 13% (n = 14) had a PhD, 4% (n = 4) had an MBA, and 23% (n = 24) were awarded a National Institutes of Health R01 grant, tendencies that were stable over time (p = 0.09–0.23), although when additional degrees were analyzed as a binary variable, chairs hired in 2010 or after were more likely to have an MBA and/or PhD versus those hired before 2010 (26% vs 10%, p = 0.04). The 3 most common residency programs attended by the neurosurgery chairs were Massachusetts General Hospital (n = 8, 8%), University of California, San Francisco (n = 8, 8%), and University of Michigan (n = 6, 6%). Most chairs (n = 63, 61%) attended residency at the institution and/or were staff at the institution before they were named chair, a tendency that persisted over time (p = 0.86).CONCLUSIONSMost neurosurgery department chairs matriculated into the position before the age of 50 years and, despite selection processes usually involving a national search, most chairs had a previous affiliation with the department, a phenomenon that has been relatively stable over time. In recent years, a large increase has occurred in the proportion of chairs with additional advanced degrees and more extensive research experience, underscoring how neurosurgical leadership has come to require scientific skills and the ability to procure grants, as well as the financial skills needed to navigate the ever-changing financial health care landscape.


2020 ◽  
pp. 344-395
Author(s):  
Richard Haw

The Niagara contract was a fitting judgment on John’s career to date, and the bridge itself was a triumph, eliciting praise and admiration from all over the globe, for both its handsome Egyptian architecture and the soundness of its design. It took four years to build and was the world’s first railroad suspension bridge, or at least the first successful one, fully demonstrating the strength and effectiveness of the suspension plan for heavy-going freight. It also compared very favorably with Robert Stephenson’s recently completed Britannia Tubular Bridge, the British engineer’s rival solution to the problem of long-span railroad bridges. A lifelong, committed abolitionist who wrote extensively about the evils of slavery, John also appreciated the impact his bridge had (somewhat incidentally) on the institution of slavery. Harriet Tubman (among others) used John’s bridge numerous times in the late 1850s to lead runaway slaves out of the United States and into British Canada.


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