Hong Kong Flies into the Future
Hong Kong's new airport, Chek Lap Kok, is scheduled to open in 1997. That is the year in which China takes over the government of Hong Kong from Great Britain. The airport,...
Bart to the Future
Construction has reached the midway point on the $2.7 billion San Francisco Bay Area Rapid Transit District Extensions Program. The first three extensions, due to open in 1995, will expand...
San Francisco CSO
Today, even a light rain can overload San Francisco's combined sewer overflow (CSO) system, sending untreated sewage and stormwater into the bay and ocean. This is especially...
Forging the Link
The Southern California region is known as the freeway capital of the world. The transportation system has been based on the freedom of the individual automobile for more than 25 years....
Bridge Design: Reality Bites Back
Many bridge engineers tend to ignore the process nature of reality, the fact that everything in this universe changes from moment to moment. When they are given the responsibility for...
Northridge Earthquake
Lifeline Performance and Post-Earthquake Response
This monograph describes the earthquake performance, emergency response, and recovery for the following lifeline systems: electric power, water, wastewater communications, roads and bridges,...
Ready for Anything
The author describes the temporary bridge developed by Caltrans for use in emergency situations where stretches of highway bridge are damaged. The bridge is made of salvaged railroad flatcars...
Calendar: Bridges 1996
Featured bridges are: Big Four Railroad Bridge (KY); Germantown Covered Bridge (OH); George Street Bridge (IN); Virgin River Bridge (UT); Bryan Bridge (NE); Brush Creek Bridge (KS); Natchez...
Application of Virtual Reality to Space Robotics Operations
This paper discusses a Virtual Reality (VR) simulation under development by the Automation and Robotics (A&R) Division at the Johnson Space Center (JSC). Over the past twelve years,...
GPS-Based Control for Space Vehicle Rendezvous
The recent advent of Differential Carrier Phase Global Position System (GPS) sensing has made it possible to determine relative positions of GPS receiver-equipped systems to less than...
Conceptual Design and Characteristics of A Dual-Arm Cam-Lock Manipulator
Recent developments in the area of smart structures indicate that variable geometry/stiffness truss network is of fundamental importance in designing smart transformable structures and...
Enabler Chassis Features and Mobiltiy Analysis
The Enabler is a proposed Lunar Base work vehicle. The unique construction of the Enabler's six-wheeled chassis provides unusual articulation for steering, balancing, and overcoming obstacles....
The Optimal Selection of Robot Modules for Space Manipulators
Monolithic robot systems are poorly suited to the broad requirements and uncertainties of space automation applications. Designers have considered building many robots, each of which can...
A Novel Gravity Compensation System for Space Robots
Realistic experimental investigation of the behavior of space robots requires simulation on earth of the micro-gravity environment existing in space. This is particularly true due to the...
On the Dynamics and Control of Flexible Orbiting Systems: An Approach with Application
A relatively general formulation for studying the dynamics and control of an arbitrary spacecraft, with interconnected flexible, deployable and articulating structural members, is reviewed...
A New Airlock Approach for Human Exploration
Conceptual design work on the First Lunar Outpost (FLO) mission led to the development of an airlock concept called the `doorlock' which appears quite promising for all aspects of manned...
Analysis of Inflating Habitable Space Structures with neomass (near-Earth-object mass)
The discovery of near Earth objects (NEOs), during August 1992, and that one of them is a dormant comet, dramatically changed the potential availability of near-Earth resources. NEOs provide...
Erectable Truss Hardware for Large Space Structures
The KATLOK connector is a truss structure connector that was designed to be compatible with manual assembly by an astronaut in an extra-vehicular activity (EVA) suit, telerobotic assembly...
Construction Operations on the OUTPOST Platform in Orbit
GLOBAL OUTPOST, Inc., with significant NASA assistance, proposes to place an External Tank (ET) of the space shuttle in orbit for commercial purposes. The OUTPOST Platform is designed...
Interactions Between the Space Station Freedom Attitude Control System and Space Shuttle Remote Manipulator Controller During On-Orbit Assembly Operations
This paper presents the results of dynamics and control interaction analyses involving the Space Shuttle Orbiter, the Shuttle Remote Manipulator System (SRMS), and the Space Station Freedom...
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