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Author: Yorguo El Hachem Publisher: ISBN: Category : Languages : en Pages : 636
Book Description
The size of the highway network has grown beyond the manageable capabilities of transportation agencies and stakeholders who are concerned with maintaining their assets using limited funding abilities. For that reason, pavement preservation programs have become very popular because they offer cost-effective spending schemes that maximize the service life of roads. Seal coats are one of the most popular pavement preventative treatments used around the world due to their high durability and low cost compared to other surface treatments. Their performance depends on the adequate computation of the aggregate and binder application rates. Misestimating these rates leads to raveling, bleeding, or other distresses. Accordingly, numerous design methods have been developed and are being implemented worldwide. This research assesses the different design philosophies and considers the assumptions adopted by each. It is challenging to design a seal coat when several design methods recommend different and inconsistent application rates. For the first time, the three-dimensional laser is incorporated in the design of seal coats in order to provide a fast, objective, and reliable approach. A predictive model is developed to determine the adequate aggregate application rate based on the size of the aggregates, i.e. the average least dimension, and their density. This study also assesses the contemporary texture characterization techniques and analyzes the variance of the sand patch test. The findings indicate that the sand patch test is not a reliable estimator of the volume of voids in the surface texture, which negatively affects the calculation of the binder application rate. The study recommends an algorithm that accurately measures the volume of voids in the existing surface texture using 3D surface scans. The outcome enhances the estimation of the binder application rate, and the findings can be applied to the existing design methods to improve the performance of the seal coat. Finally, highway agencies could incorporate the 3D laser within the binder sprayer to measure the surface texture during construction and automatically adjust the rate
Author: Yorguo El Hachem Publisher: ISBN: Category : Languages : en Pages : 636
Book Description
The size of the highway network has grown beyond the manageable capabilities of transportation agencies and stakeholders who are concerned with maintaining their assets using limited funding abilities. For that reason, pavement preservation programs have become very popular because they offer cost-effective spending schemes that maximize the service life of roads. Seal coats are one of the most popular pavement preventative treatments used around the world due to their high durability and low cost compared to other surface treatments. Their performance depends on the adequate computation of the aggregate and binder application rates. Misestimating these rates leads to raveling, bleeding, or other distresses. Accordingly, numerous design methods have been developed and are being implemented worldwide. This research assesses the different design philosophies and considers the assumptions adopted by each. It is challenging to design a seal coat when several design methods recommend different and inconsistent application rates. For the first time, the three-dimensional laser is incorporated in the design of seal coats in order to provide a fast, objective, and reliable approach. A predictive model is developed to determine the adequate aggregate application rate based on the size of the aggregates, i.e. the average least dimension, and their density. This study also assesses the contemporary texture characterization techniques and analyzes the variance of the sand patch test. The findings indicate that the sand patch test is not a reliable estimator of the volume of voids in the surface texture, which negatively affects the calculation of the binder application rate. The study recommends an algorithm that accurately measures the volume of voids in the existing surface texture using 3D surface scans. The outcome enhances the estimation of the binder application rate, and the findings can be applied to the existing design methods to improve the performance of the seal coat. Finally, highway agencies could incorporate the 3D laser within the binder sprayer to measure the surface texture during construction and automatically adjust the rate
Author: National Research Council Publisher: National Academies Press ISBN: 0309142393 Category : Law Languages : en Pages : 348
Book Description
Scores of talented and dedicated people serve the forensic science community, performing vitally important work. However, they are often constrained by lack of adequate resources, sound policies, and national support. It is clear that change and advancements, both systematic and scientific, are needed in a number of forensic science disciplines to ensure the reliability of work, establish enforceable standards, and promote best practices with consistent application. Strengthening Forensic Science in the United States: A Path Forward provides a detailed plan for addressing these needs and suggests the creation of a new government entity, the National Institute of Forensic Science, to establish and enforce standards within the forensic science community. The benefits of improving and regulating the forensic science disciplines are clear: assisting law enforcement officials, enhancing homeland security, and reducing the risk of wrongful conviction and exoneration. Strengthening Forensic Science in the United States gives a full account of what is needed to advance the forensic science disciplines, including upgrading of systems and organizational structures, better training, widespread adoption of uniform and enforceable best practices, and mandatory certification and accreditation programs. While this book provides an essential call-to-action for congress and policy makers, it also serves as a vital tool for law enforcement agencies, criminal prosecutors and attorneys, and forensic science educators.
Author: Neil Sclater Publisher: McGraw Hill Professional ISBN: 0071704426 Category : Technology & Engineering Languages : en Pages : 562
Book Description
THOUSANDS OF DRAWINGS AND DESCRIPTIONS COVER INNOVATIONS IN MECHANICAL ENGINEERING Fully revised throughout, this abundantly illustrated reference describes proven mechanisms and mechanical devices. Each illustration represents a design concept that can easily be recycled for use in new or modified mechanical, electromechanical, or mechatronic products. Tutorials on the basics of mechanisms and motion control systems introduce you to those subjects or act as a refresher. Mechanisms and Mechanical Devices Sourcebook, Fifth Edition, contains new chapters on mechanisms for converting renewable energy into electrical power, 3D digital prototyping and simulation, and progress in MEMS and nanotechnology based on carbon nanotubes. A new chapter on stationary and mobile robots describes their roles in industry, science, national defense, and medicine. The latest advances in rapid prototyping are also discussed. This practical guide will get you up to speed on many classical mechanical devices as well as the hot new topics in mechanical engineering. COMPREHENSIVE INDEX MAKES IT EASY TO FIND SUBJECTS OF INTEREST GLOSSARIES OF TERMS ON: CAMS, GEARS, MECHANICS, MOTION CONTROL, ROBOTICS, WIND TURBINES, PUMPS, AND 3D DIGITAL PROTOTYPING AND SIMULATION COVERAGE OF MOBILE ROBOTS THAT EXPLORE MARS, PERFORM MILITARY DUTIES AND PUBLIC SERVICE, HANDLE AUTOMATED DELIVERY, CONDUCT SURVEILLANCE FROM THE AIR, AND SEARCH UNDER THE SEA DETAILS ON THE MECHANISMS IN RENEWABLE-ENERGY AND WIND-TURBINE AND SOLAR-THERMAL FARMS AND WAVE-MOTION POWER PLANTS Mechanisms and Mechanical Devices Sourcebook, Fifth Edition, covers: Basics of mechanisms * Motion control systems * New stationary and mobile robots * New mechanisms for renewable power generation * Drives and mechanisms with linkages, gears, cams, genevas, and ratchets * Clutches and brakes * Latching, fastening, and clamping devices and mechanisms * Chains, belts, springs, and screws * Shaft couplings and connections * Motion-specific devices * Packaging, conveying, handling, and safety mechanisms and machines * Torque, speed, tension, and limit control systems * Instruments and controls: pneumatic, hydraulic, electric, and electronic * New 3D digital prototyping and simulation techniques * New rapid prototyping methods * New directions in mechanical engineering
Author: Donald M. Mattox Publisher: William Andrew ISBN: 0128130857 Category : Technology & Engineering Languages : en Pages : 383
Book Description
The Foundations of Vacuum Coating Technology, Second Edition, is a revised and expanded version of the first edition, which was published in 2003. The book reviews the histories of the various vacuum coating technologies and expands on the history of the enabling technologies of vacuum technology, plasma technology, power supplies, and low-pressure plasma-enhanced chemical vapor deposition. The melding of these technologies has resulted in new processes and products that have greatly expanded the application of vacuum coatings for use in our everyday lives. The book is unique in that it makes extensive reference to the patent literature (mostly US) and how it relates to the history of vacuum coating. The book includes a Historical Timeline of Vacuum Coating Technology and a Historical Timeline of Vacuum/Plasma Technology, as well as a Glossary of Terms used in the vacuum coating and surface engineering industries. - History and detailed descriptions of Vacuum Deposition Technologies - Review of Enabling Technologies and their importance to current applications - Extensively referenced text - Patents are referenced as part of the history - Historical Timelines for Vacuum Coating Technology and Vacuum/Plasma Technology - Glossary of Terms for vacuum coating
Author: Duc Pham Publisher: Springer Science & Business Media ISBN: 1447107039 Category : Technology & Engineering Languages : en Pages : 238
Book Description
Rapid prototyping is an exciting new technology used to create physical models and functional prototypes directly from CAD models. Rapid tooling concerns the production of tooling using parts manufactured by rapid prototyping. The book describes the characteristics and capabilities of the main known rapid prototyping processes. It covers in detail various commercially available processes such as: Stereolithography (SLA), Selective Laser Sintering (SLS), and others. The text places a strong emphasis on practical applications and contains an abundance of photographs and diagrams to illustrate clearly the principles of the machines and processes involved.
Author: Ian Gibson Publisher: Springer ISBN: 1493921134 Category : Technology & Engineering Languages : en Pages : 509
Book Description
This book covers in detail the various aspects of joining materials to form parts. A conceptual overview of rapid prototyping and layered manufacturing is given, beginning with the fundamentals so that readers can get up to speed quickly. Unusual and emerging applications such as micro-scale manufacturing, medical applications, aerospace, and rapid manufacturing are also discussed. This book provides a comprehensive overview of rapid prototyping technologies as well as support technologies such as software systems, vacuum casting, investment casting, plating, infiltration and other systems. This book also: Reflects recent developments and trends and adheres to the ASTM, SI, and other standards Includes chapters on automotive technology, aerospace technology and low-cost AM technologies Provides a broad range of technical questions to ensure comprehensive understanding of the concepts covered
Author: Chee Kai Chua Publisher: World Scientific Publishing Company ISBN: 9813106042 Category : Technology & Engineering Languages : en Pages : 448
Book Description
Rapid Prototyping (RP) has revolutionized the landscape of how prototypes and products are made and small batch manufacturing carried out. This book gives a comprehensive coverage of RP and rapid tooling processes, data formats and applications. A CD-ROM, included in the book, presents RP and its principles in an interactive way to augment the learning experience.Special features:
Author: Dan M. Goebel Publisher: John Wiley & Sons ISBN: 0470436263 Category : Technology & Engineering Languages : en Pages : 528
Book Description
Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to plasma physics in order to allow readers to understand the models and derivations used in determining electric thruster performance. They then go on to present detailed explanations of: Thruster principles Ion thruster plasma generators and accelerator grids Hollow cathodes Hall thrusters Ion and Hall thruster plumes Flight ion and Hall thrusters Based largely on research and development performed at the Jet Propulsion Laboratory (JPL) and complemented with scores of tables, figures, homework problems, and references, Fundamentals of Electric Propulsion: Ion and Hall Thrusters is an indispensable textbook for advanced undergraduate and graduate students who are preparing to enter the aerospace industry. It also serves as an equally valuable resource for professional engineers already at work in the field.
Author: Yorguo El Hachem
Author: Yorguo El Hachem
Author: National Research Council
Author: Neil Sclater
Author: Donald M. Mattox
Author: David A. Anderson
Author: Duc Pham
Author: Ian Gibson
Author: Chee Kai Chua
Author: Gerardo W. Flintsch
Author: Dan M. Goebel