SUPPLEMENTAL DAMPING FOR NEW AND RETROFIT CONSTRUCTION*

1999 ◽  
pp. 1 ◽  
Author(s):  
Andrew Whittaker ◽  
Michael Constantinou ◽  
Natali Sigaher
Keyword(s):  
United States ◽  
Energy Dissipation ◽  
The United States ◽  
Bridge Construction ◽  
New Developments ◽  
Modeling And Analysis ◽  
Seismic Rehabilitation ◽  
Supplemental Damping ◽  
Supplemental Dampers

Supplemental damping (energy dissipation) hardware are being employed in the United States to provide enhanced protection for new and retrofit building and bridge construction. Such hardware includes displacement- and velocity-dependent dampers. The types of dampers being implemented in the United States at this time are presented in the paper. Guidelines and commentary to aid in the implementation of passive supplemental dampers in existing construction are included in the new resource documents FEMA 273 and 274: Guidelines for the Seismic Rehabilitation of Buildings (FEMAThi, 1997). This paper introduces the FEMA 273 analysis procedures and outlines the modeling and analysis procedures developed for implementing supplemental dampers. Two new developments in the field of supplemental damping that will facilitate their application to stiff structural framing systems are the toogle-brace and scissors-jack damper configurations. These configurations are presented in the paper and their utility is demonstrated  by comparison with conventional configurations for a sample single-story, single-bay frame.

scholarly journals Modeling and analysis of COVID-19 new deaths using tree-based ensemble

2021 ◽  
Author(s):  
Ibrahim Abaker Targio Hashem ◽  
Raja Sher Afgun Usmani ◽  
Asad Ali Shah ◽  
Abdulwahab Ali Almazroi ◽  
Muhammad Bilal
Keyword(s):  
Infectious Disease ◽  
United States ◽  
Random Forest ◽  
Economic Activity ◽  
The United States ◽  
Gradient Boosting ◽  
Health Crisis ◽  
Modeling And Analysis ◽  
Extreme Gradient Boosting ◽  
The World

The COVID-19 pandemic has emerged as the world's most serious health crisis, affecting millions of people all over the world. The majority of nations have imposed nationwide curfews and reduced economic activity to combat the spread of this infectious disease. Governments are monitoring the situation and making critical decisions based on the daily number of new cases and deaths reported. Therefore, this study aims to predict the daily new deaths using four tree-based ensemble models i.e., Gradient Tree Boosting (GB), Random Forest (RF), Extreme Gradient Boosting (XGBoost), and Voting Regressor (VR) for the three most affected countries, which are the United States, Brazil, and India. The results showed that VR outperformed other models in predicting daily new deaths for all three countries. The predictions of daily new deaths made using VR for Brazil and India are very close to the actual new deaths, whereas the prediction of daily new deaths for the United States still needs to be improved.<br>

Awash in the Storm of National Revolution

2016 ◽  
Author(s):  
Motoe Sasaki
Keyword(s):  
United States ◽  
Gender Differences ◽  
The United States ◽  
Women Missionaries ◽  
New Developments ◽  
New Women ◽  
New Ideas

This chapter explores the aftermath of the collapse of the Wilsonian moment and its uneven and gendered effects on American New Women missionaries' enterprises in the Nationalist Revolution period (1924–27). It was at this time that the missionaries came to feel the power of the national revolution movement and found their projects were being reframed within new ideas and articulated in a new vocabulary that had become current in China. In taking such changes into account, they had to interpret and respond to new developments and ultimately reconsider their own perceptions of the United States and the very nature of their existence in China. Local Chinese resistance to their educational projects and institutions directed toward American New Women missionaries also brought into play gender differences and issues among the Chinese themselves and consequently made the difficulties facing the missionaries all the more complex and entrenched.

Operations of Chicago Helicopter Airways, Inc.

1962 ◽  
Vol 66 (620) ◽  
pp. 503-508
Author(s):  
R. S. Angstadt
Keyword(s):  
United States ◽  
New York ◽  
Early Development ◽  
The United States ◽  
Second World War ◽  
Post Office ◽  
World War ◽  
New Developments ◽  
Second World ◽  
The U.S

The operations of Chicago Helicopter Airways represent a portion of the total Federal effort within the United States on behalf of helicopter development. This effort has been an outgrowth of the interest of the Civil Aeronautics Board and the U.S. Post Office Department which has a long tradition of looking for new developments in transport and of experimenting in new ways to move mail. Post Office interest in the aeroplane was the chief stimulus to the early development of U.S. airlines and dates back to the first scheduled air mail route authorised between New York and Washington in August 1918. It was natural, then, that the Post Office Department should have interest in the helicopter as it emerged in usable form for civil use after the Second World War.

16. The United States in the Middle East

2016 ◽  
Author(s):  
Michael C. Hudson
Keyword(s):  
United States ◽  
Middle East ◽  
Middle Eastern ◽  
The United States ◽  
Terrorist Attacks ◽  
Past Century ◽  
New Developments ◽  
The World ◽  
Islamic Republic Of Iran ◽  
The U.S

This chapter examines the roots of U.S. foreign policy in the Middle East. It begins with an overview of the origins and development of the United States’s involvement in the region over the past century, focusing on the traditional American interests. It then considers the structure of Middle Eastern policymaking and its domestic political context, as well as Washington’s response to new regional tensions and upheavals since the late 1970s. It also discusses new developments in the region, including the rise of the Islamic Republic of Iran, the Al-Qaeda and the 9/11 terrorist attacks, the U.S.-led interventions in Afghanistan and Iraq, and the Palestinian–Israeli impasse. The evolution of U.S. policy since 2000 in the administrations of George W. Bush and Barack Obama is explored as well. The chapter concludes with an analysis of an ‘Obama doctrine’ and ‘American decline’ in the Middle East and the world.

Four proclamatory confrontations in scribal refraction

2003 ◽  
Vol 56 (4) ◽  
pp. 404-426
Author(s):  
Walter Brueggemann
Keyword(s):  
United States ◽  
Practical Implication ◽  
The United States ◽  
Biblical Text ◽  
New Developments ◽  
Canonical Formulation ◽  
Editorial Work

This paper offers a reflection upon the current preaching crisis in those parts of the United States church where old assumptions about preaching authority have collapsed. While preachers may have models of great confrontational authority available, in fact such authority for confrontation through preaching has largely evaporated. This paper explores new developments in OT studies that are related to canonical formulation, namely, that the biblical text as we have it is an outcome of belated editorial work whereby the text was reshaped with theological intentionality by scribes, a generative force in Judaism that transposed powerful memories into texts. Consequently, the great texts of confrontation between prophet and king, between truth and power, no longer offer dramatic confrontations but rather offer textual reflections upon remembered and perhaps constructed confrontations. The practical implication for preaching from this insight is that the preacher is not and need not be a player in confrontation as a prophet, but rather may be a scribe who keeps old texts available whereby the baptismal community may imagine its life differently. Four texts are considered wherein remembered dramatic confrontations have become textual resources.

Erasmus Lecture 2005 From science to education: the need for a revolution

2006 ◽  
Vol 14 (1) ◽  
pp. 3-21 ◽  
Author(s):  
PIERRE LÉNA
Keyword(s):  
United States ◽  
Scientific Literacy ◽  
Developed Countries ◽  
The United States ◽  
Elementary Level ◽  
Education For All ◽  
New Developments ◽  
New Approach ◽  
Education Practice ◽  
The World

Primary education for all seems on the way to being achieved throughout the world within a couple of decades, despite the deep inequalities and lack of resources that remain. Science education at an elementary level, during the first years of school, should now be considered as essential to the cultural, civic, ethical, economic and technical development of humans and societies, in a context of globalization, as the triad ‘reading–writing–arithmetic’ has been during the two last centuries. Yet current education practice – which often characterizes science lessons in developed countries as well as in developing ones, when they exist at all – is quite unsatisfactory, as it is more concerned with transferring knowledge of facts than with scientific literacy, and misses the goal of capacity building. New developments in the last decade, based on inquiry pedagogy and often proposed or led by science Academies, have demonstrated another way to communicate science, and to involve and train teachers. In France, the United States and Sweden, but also in China, Brazil and Egypt, the results of this new approach have led to great hopes for transformation, fully supported by science academies. In Europe, a recently implemented EU programme aims at similar goals, in the spirit of the Lisbon objectives toward a society of knowledge.

NEHRP Guidelines and Commentary for the Seismic Rehabilitation of Buildings

2000 ◽  
Vol 16 (1) ◽  
pp. 227-239 ◽  
Author(s):  
Daniel Shapiro ◽  
Christopher Rojahn ◽  
Lawrence D. Reaveley ◽  
James R. Smith ◽  
Ugo Morelli
Keyword(s):  
United States ◽  
Emergency Management ◽  
Seismic Design ◽  
Building Material ◽  
The United States ◽  
Seismic Resistance ◽  
Existing Buildings ◽  
Seismic Rehabilitation ◽  
Professional Practitioners ◽  
New Buildings

Based on the conclusion that the primary barrier to widespread seismic rehabilitation of buildings in the United States was the lack of a consensus-backed, nationally applicable, professionally accepted rehabilitation standard, the Federal Emergency Management Agency supported the development of the NEHRP Guidelines and Commentary for the Seismic Rehabilitation of Buildings (FEMA 273 and 274). A six-year effort by a team of experienced professional practitioners and university researchers who were motivated to produce a standard that specifically addressed the differences in designing for seismic resistance in new buildings, as opposed to existing buildings, resulted in the NEHRP Guidelines and Commentary for the Seismic Rehabilitation of Buildings. These NEHRP Guidelines will provide the tools for design professionals of varying expertise in seismic design to design economical and appropriate seismic rehabilitation for buildings of essentially any size, commonly used building material and configuration.

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