Development and Testing of a Non-pinned Low-profile End Treatment PDF Download
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Author: W. Lynn Beason
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 81
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Author: W. Lynn Beason
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 81
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Author: Felicia Jean Desorcie
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Book Description
In the early 1990s, the Low-Profile Portable Concrete Barrier (PCB) system, including both the sloped Low-Profile PCB segment and Low-Profile PCB end treatment, were developed. The original Low-Profile PCB end treatment was designed with steel pins inserted along the barrier centerline, through precast holes, and anchored to the pavement or subgrade. The purpose of these pins was to reduce lateral deflection of the end treatment during an impact. For various reasons, users of the Low-Profile PCB system have stated that the system would be more easily deployed if the vertical pins were not used in situations where lateral deflections can be permitted. The primary objective of the research presented herein was to determine the feasibility of removing the vertical, steel pins from the Low-Profile PCB end treatment in certain applications and if necessary make modifications. The secondary objective of the research presented herein was to demonstrate the applicability of the finite element analysis (FEA) to unpinned barrier systems. The research objectives were achieved through the use of sound engineering judgment, FEA, and a full-scale crash test. Based on sound engineering judgment and approximate strength analyses of the original Low-Profile PCB design, the author determined the system would most likely function acceptably but would have large lateral deflections. In order to increase connection rigidity and thus control lateral displacement, a plate washer was added to the barrier connection. The modified non-pinned Low-Profile PCB system was tested for strength in a full-scale crash test under Manual for Assessing Safety Hardware (MASH) test 2-35. Additionally, the recommended system was analyzed under similar test conditions with LS-DYNA, a finite element code. The recommended system passed the MASH test 2-35, in both a full-scale crash test and FEA. While this does not replace the original barrier, it does provide another option for use of the Low-Profile PCB in situations where sufficient room for deflection outside of the length of need exists. If this room does not exist, the barrier must remain pinned. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151825
Author: American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 560
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Author: Hans Rosling
Publisher: Flatiron Books
ISBN: 125012381X
Category : Science
Languages : en
Pages : 353
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INSTANT NEW YORK TIMES BESTSELLER “One of the most important books I’ve ever read—an indispensable guide to thinking clearly about the world.” – Bill Gates “Hans Rosling tells the story of ‘the secret silent miracle of human progress’ as only he can. But Factfulness does much more than that. It also explains why progress is so often secret and silent and teaches readers how to see it clearly.” —Melinda Gates "Factfulness by Hans Rosling, an outstanding international public health expert, is a hopeful book about the potential for human progress when we work off facts rather than our inherent biases." - Former U.S. President Barack Obama Factfulness: The stress-reducing habit of only carrying opinions for which you have strong supporting facts. When asked simple questions about global trends—what percentage of the world’s population live in poverty; why the world’s population is increasing; how many girls finish school—we systematically get the answers wrong. So wrong that a chimpanzee choosing answers at random will consistently outguess teachers, journalists, Nobel laureates, and investment bankers. In Factfulness, Professor of International Health and global TED phenomenon Hans Rosling, together with his two long-time collaborators, Anna and Ola, offers a radical new explanation of why this happens. They reveal the ten instincts that distort our perspective—from our tendency to divide the world into two camps (usually some version of us and them) to the way we consume media (where fear rules) to how we perceive progress (believing that most things are getting worse). Our problem is that we don’t know what we don’t know, and even our guesses are informed by unconscious and predictable biases. It turns out that the world, for all its imperfections, is in a much better state than we might think. That doesn’t mean there aren’t real concerns. But when we worry about everything all the time instead of embracing a worldview based on facts, we can lose our ability to focus on the things that threaten us most. Inspiring and revelatory, filled with lively anecdotes and moving stories, Factfulness is an urgent and essential book that will change the way you see the world and empower you to respond to the crises and opportunities of the future. --- “This book is my last battle in my life-long mission to fight devastating ignorance...Previously I armed myself with huge data sets, eye-opening software, an energetic learning style and a Swedish bayonet for sword-swallowing. It wasn’t enough. But I hope this book will be.” Hans Rosling, February 2017.
Author: Daron Acemoglu
Publisher: Currency
ISBN: 0307719227
Category : Business & Economics
Languages : en
Pages : 546
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Book Description
Brilliant and engagingly written, Why Nations Fail answers the question that has stumped the experts for centuries: Why are some nations rich and others poor, divided by wealth and poverty, health and sickness, food and famine? Is it culture, the weather, geography? Perhaps ignorance of what the right policies are? Simply, no. None of these factors is either definitive or destiny. Otherwise, how to explain why Botswana has become one of the fastest growing countries in the world, while other African nations, such as Zimbabwe, the Congo, and Sierra Leone, are mired in poverty and violence? Daron Acemoglu and James Robinson conclusively show that it is man-made political and economic institutions that underlie economic success (or lack of it). Korea, to take just one of their fascinating examples, is a remarkably homogeneous nation, yet the people of North Korea are among the poorest on earth while their brothers and sisters in South Korea are among the richest. The south forged a society that created incentives, rewarded innovation, and allowed everyone to participate in economic opportunities. The economic success thus spurred was sustained because the government became accountable and responsive to citizens and the great mass of people. Sadly, the people of the north have endured decades of famine, political repression, and very different economic institutions—with no end in sight. The differences between the Koreas is due to the politics that created these completely different institutional trajectories. Based on fifteen years of original research Acemoglu and Robinson marshall extraordinary historical evidence from the Roman Empire, the Mayan city-states, medieval Venice, the Soviet Union, Latin America, England, Europe, the United States, and Africa to build a new theory of political economy with great relevance for the big questions of today, including: - China has built an authoritarian growth machine. Will it continue to grow at such high speed and overwhelm the West? - Are America’s best days behind it? Are we moving from a virtuous circle in which efforts by elites to aggrandize power are resisted to a vicious one that enriches and empowers a small minority? - What is the most effective way to help move billions of people from the rut of poverty to prosperity? More philanthropy from the wealthy nations of the West? Or learning the hard-won lessons of Acemoglu and Robinson’s breakthrough ideas on the interplay between inclusive political and economic institutions? Why Nations Fail will change the way you look at—and understand—the world.
Author: Ken Skorseth
Publisher:
ISBN:
Category : Gravel roads
Languages : en
Pages : 112
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Book Description
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Author: Nina Munk
Publisher: Anchor
ISBN: 0385537743
Category : Social Science
Languages : en
Pages : 259
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NAMED ONE OF THE BEST BOOKS OF THE YEAR BY Bloomberg • Forbes • The Spectator Recipient of Foreign Policy's 2013 Albie Award A powerful portrayal of Jeffrey Sachs's ambitious quest to end global poverty "The poor you will always have with you," to cite the Gospel of Matthew 26:11. Jeffrey Sachs—celebrated economist, special advisor to the Secretary General of the United Nations, and author of the influential bestseller The End of Poverty—disagrees. In his view, poverty is a problem that can be solved. With single-minded determination he has attempted to put into practice his theories about ending extreme poverty, to prove that the world's most destitute people can be lifted onto "the ladder of development." In 2006, Sachs launched the Millennium Villages Project, a daring five-year experiment designed to test his theories in Africa. The first Millennium village was in Sauri, a remote cluster of farming communities in western Kenya. The initial results were encouraging. With his first taste of success, and backed by one hundred twenty million dollars from George Soros and other likeminded donors, Sachs rolled out a dozen model villages in ten sub-Saharan countries. Once his approach was validated it would be scaled up across the entire continent. At least that was the idea. For the past six years, Nina Munk has reported deeply on the Millennium Villages Project, accompanying Sachs on his official trips to Africa and listening in on conversations with heads-of-state, humanitarian organizations, rival economists, and development experts. She has immersed herself in the lives of people in two Millennium villages: Ruhiira, in southwest Uganda, and Dertu, in the arid borderland between Kenya and Somalia. Accepting the hospitality of camel herders and small-hold farmers, and witnessing their struggle to survive, Munk came to understand the real-life issues that challenge Sachs's formula for ending global poverty. THE IDEALIST is the profound and moving story of what happens when the abstract theories of a brilliant, driven man meet the reality of human life.
Author: Bill Gates
Publisher: Vintage
ISBN: 0385546149
Category : Science
Languages : en
Pages : 201
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Book Description
#1 NEW YORK TIMES BEST SELLER • In this urgent, authoritative book, Bill Gates sets out a wide-ranging, practical—and accessible—plan for how the world can get to zero greenhouse gas emissions in time to avoid a climate catastrophe. Bill Gates has spent a decade investigating the causes and effects of climate change. With the help of experts in the fields of physics, chemistry, biology, engineering, political science, and finance, he has focused on what must be done in order to stop the planet's slide to certain environmental disaster. In this book, he not only explains why we need to work toward net-zero emissions of greenhouse gases, but also details what we need to do to achieve this profoundly important goal. He gives us a clear-eyed description of the challenges we face. Drawing on his understanding of innovation and what it takes to get new ideas into the market, he describes the areas in which technology is already helping to reduce emissions, where and how the current technology can be made to function more effectively, where breakthrough technologies are needed, and who is working on these essential innovations. Finally, he lays out a concrete, practical plan for achieving the goal of zero emissions—suggesting not only policies that governments should adopt, but what we as individuals can do to keep our government, our employers, and ourselves accountable in this crucial enterprise. As Bill Gates makes clear, achieving zero emissions will not be simple or easy to do, but if we follow the plan he sets out here, it is a goal firmly within our reach.
Author: Paul Hopper
Publisher: Polity
ISBN: 0745638945
Category : Business & Economics
Languages : en
Pages : 345
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Book Description
"Drawing on a wide range of case studies from across the globe, this book explores such areas as: health and population growth, conflict and security, global inequality and poverty, fair trade and trade liberalization, gender and education, foreign aid and debt, and sustainability and the environment. This issues-driven text focuses on the debates that have generated the most interest and passion among practitioners and non-practitioners alike. Always attentive to the contested and plural nature of the field, it makes the case for a genuinely interdisciplinary approach which takes full account of the impact of globalization."--Publisher
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1690
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