Scientific and Architectural Style in IM Pei's Mesa Laboratory and Louis Kahn's Salk In
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Musings on the Planck Length Universe
Musings on the Planck Length Universe -How does matter, or how does a change move through space on the micro- level? The answer depends on how the structure of space and matter are defined at a certain order of magnitude and what are their properties at that level. We will assume that, on the micro-level, the limits of space are discrete, consisting of the smallest units possible. Therefore, in order to define the structure of space on this level it would be necessary to introduce a notion of an “elementary spatial unit” (ESU), the smallest part of space, some kind of spatial “atom”. This would be the smallest and indivisible finite part (cell) of space, defined only by size and position (neighborhoods). It doesn’t have any content, but it could be filled with some property like “matter” or “vacuum”. There are two possibilities in which a property can to move through space (change its position). One would be that an ESU itself, containing a certain property, moves between other ESU carrying its content like a fish moving through the water or a ball through the air. Another possibility would be that the positions of all the ESU don’t change while their content is moving. This would be like an old billboard covered with light bulbs, or a screen with pixels. The positions of the bulbs or pixels are fixed, and only their content (light) changes position from one bulb to the other. Here the spatial structure (the structure of positions) is fixed and it is only the property (the content) that changes positions, thus moving through space. -
Six Easy Roads to the Planck Scale
Six easy roads to the Planck scale Ronald J. Adler∗ Hansen Laboratory for Experimental Physics Gravity Probe B Mission, Stanford University, Stanford California 94309 Abstract We give six arguments that the Planck scale should be viewed as a fundamental minimum or boundary for the classical concept of spacetime, beyond which quantum effects cannot be neglected and the basic nature of spacetime must be reconsidered. The arguments are elementary, heuristic, and plausible, and as much as possible rely on only general principles of quantum theory and gravity theory. The paper is primarily pedagogical, and its main goal is to give physics students, non-specialists, engineers etc. an awareness and appreciation of the Planck scale and the role it should play in present and future theories of quantum spacetime and quantum gravity. arXiv:1001.1205v1 [gr-qc] 8 Jan 2010 1 I. INTRODUCTION Max Planck first noted in 18991,2 the existence of a system of units based on the three fundamental constants, G = 6:67 × 10−11Nm2=kg2(or m3=kg s2) (1) c = 3:00 × 108m=s h = 6:60 × 10−34Js(or kg m2=s) These constants are dimensionally independent in the sense that no combination is dimen- sionless and a length, a time, and a mass, may be constructed from them. Specifically, using ~ ≡ h=2π = 1:05 × 10−34Js in preference to h, the Planck scale is r r G G l = ~ = 1:6 × 10−35m; T = ~ = 0:54 × 10−43; (2) P c3 P c5 r c M = ~ = 2:2 × 10−8kg P G 2 19 3 The energy associated with the Planck mass is EP = MP c = 1:2 × 10 GeV . -
Chapter 3 Why Physics Is the Easiest Science Effective Theories
CHAPTER 3 WHY PHYSICS IS THE EASIEST SCIENCE EFFECTIVE THEORIES If we had to understand the whole physical universe at once in order to understand any part of it, we would have made little progress. Suppose that the properties of atoms depended on their history, or whether they were in stars or people or labs we might not understand them yet. In many areas of biology and ecology and other fields systems are influenced by many factors, and of course the behavior of people is dominated by our interactions with others. In these areas progress comes more slowly. The physical world, on the other hand, can be studied in segments that hardly affect one another, as we will emphasize in this chapter. If our goal is learning how things work, a segmented approach is very fruitful. That is one of several reasons why physics began earlier in history than other sciences, and has made considerable progress it really is the easiest science. (Other reasons in addition to the focus of this chapter include the relative ease with which experiments can change one quantity at a time, holding others fixed; the relative ease with which experiments can be repeated and improved when the implications are unclear; and the high likelihood that results are described by simple mathematics, allowing testable predictions to be deduced.) Once we understand each segment we can connect several of them and unify our understanding, a unification based on real understanding of how the parts of the world behave rather than on philosophical speculation. The history of physics could be written as a process of tackling the separate areas once the technology and available understanding allow them to be studied, followed by the continual unification of segments into a larger whole. -
An Improbable Venture
AN IMPROBABLE VENTURE A HISTORY OF THE UNIVERSITY OF CALIFORNIA, SAN DIEGO NANCY SCOTT ANDERSON THE UCSD PRESS LA JOLLA, CALIFORNIA © 1993 by The Regents of the University of California and Nancy Scott Anderson All rights reserved. Library of Congress Cataloging in Publication Data Anderson, Nancy Scott. An improbable venture: a history of the University of California, San Diego/ Nancy Scott Anderson 302 p. (not including index) Includes bibliographical references (p. 263-302) and index 1. University of California, San Diego—History. 2. Universities and colleges—California—San Diego. I. University of California, San Diego LD781.S2A65 1993 93-61345 Text typeset in 10/14 pt. Goudy by Prepress Services, University of California, San Diego. Printed and bound by Graphics and Reproduction Services, University of California, San Diego. Cover designed by the Publications Office of University Communications, University of California, San Diego. CONTENTS Foreword.................................................................................................................i Preface.........................................................................................................................v Introduction: The Model and Its Mechanism ............................................................... 1 Chapter One: Ocean Origins ...................................................................................... 15 Chapter Two: A Cathedral on a Bluff ......................................................................... 37 Chapter Three: -
Case Study: San Diego
Building the Innovation Economy City-Level Strategies for Planning, Placemaking, and Promotion Case study: San Diego October 2016 Authors: Professor Greg Clark, Dr Tim Moonen, and Jonathan Couturier ii | Building the Innovation Economy | Case study: San Diego About ULI The mission of the Urban Land Institute is to • Advancing land use policies and design ULI has been active in Europe since the early provide leadership in the responsible use of practices that respect the uniqueness of 1990s and today has over 2,900 members land and in creating and sustaining thriving both the built and natural environments. across 27 countries. The Institute has a communities worldwide. particularly strong presence in the major • Sharing knowledge through education, Europe real estate markets of the UK, Germany, ULI is committed to: applied research, publishing, and France, and the Netherlands, but is also active electronic media. in emerging markets such as Turkey and • Bringing together leaders from across the Poland. fields of real estate and land use policy to • Sustaining a diverse global network of local exchange best practices and serve practice and advisory efforts that address community needs. current and future challenges. • Fostering collaboration within and beyond The Urban Land Institute is a non-profit ULI’s membership through mentoring, research and education organisation supported dialogue, and problem solving. by its members. Founded in Chicago in 1936, the institute now has over 39,000 members in • Exploring issues of urbanisation, 82 countries worldwide, representing the entire conservation, regeneration, land use, capital spectrum of land use and real estate formation, and sustainable development. development disciplines, working in private enterprise and public service. -
Water, Capitalism, and Urbanization in the Californias, 1848-1982
TIJUANDIEGO: WATER, CAPITALISM, AND URBANIZATION IN THE CALIFORNIAS, 1848-1982 A Dissertation submitted to the Faculty of the Graduate School of Arts and Sciences of Georgetown University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in History By Hillar Yllo Schwertner, M.A. Washington, D.C. August 14, 2020 Copyright 2020 by Hillar Yllo Schwertner All Rights Reserved ii TIJUANDIEGO: WATER, CAPITALISM, AND URBANIZATION IN THE CALIFORNIAS, 1848-1982 Hillar Yllo Schwertner, M.A. Dissertation Advisor: John Tutino, Ph.D. ABSTRACT This is a history of Tijuandiego—the transnational metropolis set at the intersection of the United States, Mexico, and the Pacific World. Separately, Tijuana and San Diego constitute distinct but important urban centers in their respective nation-states. Taken as a whole, Tijuandiego represents the southwestern hinge of North America. It is the continental crossroads of cultures, economies, and environments—all in a single, physical location. In other words, Tijuandiego represents a new urban frontier; a space where the abstractions of the nation-state are manifested—and tested—on the ground. In this dissertation, I adopt a transnational approach to Tijuandiego’s water history, not simply to tell “both sides” of the story, but to demonstrate that neither side can be understood in the absence of the other. I argue that the drawing of the international boundary in 1848 established an imbalanced political ecology that favored San Diego and the United States over Tijuana and Mexico. The land and water resources wrested by the United States gave it tremendous geographical and ecological advantages over its reeling southern neighbor, advantages which would be used to strengthen U.S. -
Gy Use Units and the Scales of Ener
The Basics: SI Units A tour of the energy landscape Units and Energy, power, force, pressure CO2 and other greenhouse gases conversion The many forms of energy Common sense and computation 8.21 Lecture 2 Units and the Scales of Energy Use September 11, 2009 8.21 Lecture 2: Units and the scales of energy use 1 The Basics: SI Units A tour of the energy landscape Units and Energy, power, force, pressure CO2 and other greenhouse gases conversion The many forms of energy Common sense and computation Outline • The basics: SI units • The principal players:gy ener , power, force, pressure • The many forms of energy • A tour of the energy landscape: From the macroworld to our world • CO2 and other greenhouse gases: measurements, units, energy connection • Perspectives on energy issues --- common sense and conversion factors 8.21 Lecture 2: Units and the scales of energy use 2 The Basics: SI Units tour of the energy landscapeA Units and , force, pressure, powerEnergy CO2 and other greenhouse gases conversion The many forms of energy Common sense and computation SI ≡ International System MKSA = MeterKilogram, , Second,mpereA Unit s Not cgs“English” or units! Electromagnetic units Deriud v n e its ⇒ Char⇒ geCoulombs EnerJ gy oul es ⇒ Current ⇒ Amperes Po werW a tts ⇒ Electrostatic potentialV⇒ olts Pr e ssuP a r s e cals ⇒ Resistance ⇒ Ohms Fo rNe c e wto n s T h erma l un i ts More about these next... TemperatureK⇒ elvinK) ( 8.21 Lecture 2: Units and the scales of energy use 3 The Basics: SI Units A tour of the energy landscape Units and Energy, power, -
PIONEERS by Christine Clark, Muir ’06
Fifty years ago this month, approximately 180 freshman students started classes at the fledgling University of California, San Diego. PIONEERS by Christine Clark, Muir ’06 36 September 2014 alumni.ucsd.edu/magazine All but 30 of the freshmen were science majors and there were, as a registrar told the press that year, “two boys for every girl.” At the time, there were no freeways near the four year-old univer- All but 30 of the freshmen were science majors and there sity, which was cleaved in half by U.S. 101. The campus was made were, as a registrar told the press that year, “two boys for every up of three academic buildings: B, C, and D (building A was the girl.” According to Penner, a philosophy major, who now works steam plant), and there were no dormitories. Dirt, not concrete, as a government property administrator for Raytheon, and Roger filled what was later to be known as Revelle Plaza. And construc- Carne, Revelle ’68, a math major, camaraderie was strong amongst tion on the Central Library (later renamed Geisel Library) wouldn’t the small class. break ground for another three years. “Everybody knew everybody, we were all friends,” says Carne, But even so, 181 pioneering students arrived at the relatively who now works in software development. “We all took the same barren mesa on the northern edge of the city. They were the cam- classes, we were all in the same boat.” pus’s first undergraduate class, and joined about 280 graduate The Revelle College curriculum proved to be interesting, but students, some of whom had been at the University since its difficult for the first students. -
The Planck Mass and the Chandrasekhar Limit
The Planck mass and the Chandrasekhar limit ͒ David Garfinklea Department of Physics, Oakland University, Rochester, Michigan 48309 ͑Received 6 November 2008; accepted 10 March 2009͒ The Planck mass is often assumed to play a role only at the extremely high energy scales where quantum gravity becomes important. However, this mass plays a role in any physical system that involves gravity, quantum mechanics, and relativity. We examine the role of the Planck mass in determining the maximum mass of white dwarf stars. © 2009 American Association of Physics Teachers. ͓DOI: 10.1119/1.3110884͔ I. INTRODUCTION ery part of the gas is in equilibrium and thus must have zero net force on it. In particular, consider a small disk of the gas The Planck mass, length, and time can be constructed with base area A and thickness dr at a distance r from the from the Newton gravitational constant G, the Planck con- center of the ball. Denote the mass of the disk by m , and the ប 1 d stant , and the speed of light c. In particular, the Planck mass of all the gas at radii smaller than r by M͑r͒. Newton mass, MP is given by showed that the disk would be gravitationally attracted by បc the gas at radii smaller than r, but unaffected by the gas at M = ͱ . ͑1͒ radii larger than r, and the force on the disk would be the P G same as if all the mass at radii smaller than r were concen- The Planck mass is very small on the human scale because trated at the center. -
Orders of Magnitude (Length) - Wikipedia
03/08/2018 Orders of magnitude (length) - Wikipedia Orders of magnitude (length) The following are examples of orders of magnitude for different lengths. Contents Overview Detailed list Subatomic Atomic to cellular Cellular to human scale Human to astronomical scale Astronomical less than 10 yoctometres 10 yoctometres 100 yoctometres 1 zeptometre 10 zeptometres 100 zeptometres 1 attometre 10 attometres 100 attometres 1 femtometre 10 femtometres 100 femtometres 1 picometre 10 picometres 100 picometres 1 nanometre 10 nanometres 100 nanometres 1 micrometre 10 micrometres 100 micrometres 1 millimetre 1 centimetre 1 decimetre Conversions Wavelengths Human-defined scales and structures Nature Astronomical 1 metre Conversions https://en.wikipedia.org/wiki/Orders_of_magnitude_(length) 1/44 03/08/2018 Orders of magnitude (length) - Wikipedia Human-defined scales and structures Sports Nature Astronomical 1 decametre Conversions Human-defined scales and structures Sports Nature Astronomical 1 hectometre Conversions Human-defined scales and structures Sports Nature Astronomical 1 kilometre Conversions Human-defined scales and structures Geographical Astronomical 10 kilometres Conversions Sports Human-defined scales and structures Geographical Astronomical 100 kilometres Conversions Human-defined scales and structures Geographical Astronomical 1 megametre Conversions Human-defined scales and structures Sports Geographical Astronomical 10 megametres Conversions Human-defined scales and structures Geographical Astronomical 100 megametres 1 gigametre -
Bridging the Centuries: the Jewel on the Bay Commemorating the History of the County Administration Center - 2Nd Edition JEWEL on the BAY 2
Bridging the Centuries: The Jewel on the Bay Commemorating the History of the County Administration Center - 2nd Edition JEWEL ON THE BAY 2 Bridging the Centuries: The Jewel on the Bay is the second edition about the history of the San Diego County Administration Center. Beginning in 1902, San Diego’s civic leaders crossed many hurdles before construction could begin on this public building. Bridging the Centuries exam- ines its history and gives us a glimpse into the region at that time. It also commemorates the many San Diegans who held to their vision and overcame numerous obstacles in bringing this grand building to reality. This building’s legacy began in 1938 with its dedication by President Franklin Delano Roosevelt. The County Administration Center stands as a testa- ment to the strength, vitality, diversity, livability and beauty of this region. This book tells its story. Clerk of the Board of Supervisors, County of San Diego, June 2012 JEWEL ON THE BAY 3 San Diego County Board of Supervisors Greg Cox Dianne Jacob Pam Slater-Price Ron Roberts Bill Horn District 1 District 2 District 3 District 4 District 5 Walter F. Ekard Helen Robbins-Meyer Chief Administrative Assistant Chief Officer Administrative Officer JEWEL ON THE BAY 4 Table of Contents Preface 5 Layout of the grounds 23 Resource Catalog 54 Conception of the Dream 7 The Civic Center becomes the CAC 25 Sources and Locations 54 The Era Preceding Construction 7 The CAC: 1963-1998 25 Available Information 54 Examination of potential construction sites 8 Building expansions -
John and Jane Adams Ephemera Collection MS-0384
http://oac.cdlib.org/findaid/ark:/13030/c8416zrt No online items John and Jane Adams Ephemera Collection MS-0384 Kira Hall Special Collections & University Archives 5500 Campanile Dr. MC 8050 San Diego, CA 92182-8050 [email protected] URL: http://library.sdsu.edu/scua John and Jane Adams Ephemera MS-0384 1 Collection MS-0384 Contributing Institution: Special Collections & University Archives Title: John and Jane Adams Ephemera Collection Creator: Adams Ephemera Collection (John and Jane Adams Ephemera Collection) Identifier/Call Number: MS-0384 Physical Description: 10.35 Linear Feet Date: 1856-1996 Date (bulk): 1880-1982 Language of Material: English . Scope and Contents The John and Jane Adams Ephemera Collection (1856-1996) offers a glimpse into some of the ways printed materials were used to capture the interest of American culture from the late 1800s through the late 1900s. Such a collection can be used to trace shifts in cultural norms, as these items of ephemera typically reflect the prevailing sentiments of the population for whom the materials were created. The subject matter of the ephemera in this collection varies as wildly as the materials used to create it. The collection has been divided into six series based on subject: Business and Commerce (1880-1982), Political (1903-1996), Travel (1901-1981), Games and Hobbies (ca. 1880's-1942), Religious (1856-1950), and Educational (1907-1935). I. Business and Commerce Inclusive Dates: 1880-1982 Predominant Dates: 1880-1939 The Business and Commerce series predominantly features advertising materials in a variety of formats. While the bulk of these items were manufactured in the late nineteenth and early twentieth centuries, many of the formats found in this series remain commonplace to American consumer culture, such as brochures, flyers, and business cards.