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Fabrication Operation And Health Monitoring Of Bender Elements For Aggressive Environments
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Book Synopsis Fabrication, Operation, and Health Monitoring of Bender Elements for Aggressive Environments by : Brina M. Montoya
Download or read book Fabrication, Operation, and Health Monitoring of Bender Elements for Aggressive Environments written by Brina M. Montoya and published by . This book was released on 2012 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bender elements are commonly used to monitor the shear wave velocity of soils in various tests, including triaxial, consolidation, and centrifuge tests. When used in aggressive soil environments, electromagnetic crosstalk can distort the received bender element signal, preventing accurate shear wave velocity measurements. Aggressive soil environments are defined herein as conductive soils with high relative permittivity. Under these conditions, the electrical source is transmitted from source to receiver bender, dominating any received shear wave signal propagating through the soil. Careful attention must be paid to reducing the transmission of the electromagnetic signal, particularly in aggressive soil environments. When the waterproof coating of a bender element degrades and the inner and outer electrodes become electrically connected in a saturated environment, the bender element will no longer operate. However, when the waterproofing material is degraded so that only a single electrode on the source element is exposed, electric current can enter the pore fluid and affect the received signal. Further, even if the waterproofing coating is intact, electromagnetic crosstalk from the induced electrical field generated by the transmitting bender element can still affect the received signal when the conductivity of the pore fluid is high. Bender elements can be constructed so as to greatly reduce the electromagnetic crosstalk, and simple tests can be performed to help ensure that the bender element system is not susceptible to crosstalk. The objective here is to present details and practical guidelines regarding the fabrication, operation, and health monitoring of bender elements that will help ensure clear shear wave velocity measurements in aggressive soil environments. The fabrication steps presented improve on previous recommendations. Bender element operation (including signal form, frequency, and amplitude) also affects signal quality and the accuracy of the measured travel time. Finally, recommendations for monitoring the health of the bender elements throughout the transducer life are outlined.
Book Synopsis ICPMG2014 - Physical Modelling in Geotechnics by : Christophe Gaudin
Download or read book ICPMG2014 - Physical Modelling in Geotechnics written by Christophe Gaudin and published by CRC Press. This book was released on 2019-01-08 with total page 1366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th International Conference on Physical Modelling in Geotechnics (ICPMG2014) was organised by the Centre for Offshore Foundation Systems at the University of Western Australia under the auspices of the Technical Committee 104 for Physical Modelling in Geotechnics of the International Society of Soil Mechanics and Geotechnical Engineering. This quadrennial conference is the traditional focal point for the physical modelling community of academics, scientists and engineers to present and exchange the latest developments on a wide range of physical modelling aspects associated with geotechnical engineering. These proceedings, together with the seven previous proceedings dating from 1988, present an inestimable collection of the technical and scientific developments and breakthroughs established over the last 25 years. These proceedings include 10 keynote lectures from scientific leaders within the physical modelling community and 160 peer-reviewed papers from 26 countries. They are organised in 14 themes, presenting the latest developments in physical modelling technology, modelling techniques and sensors, through a wide range of soil-structure interaction problems, including shallow and deep foundations, offshore geotechnics, dams and embankments, excavations and retaining structures and slope stability. Fundamental aspects of earthquake engineering, geohazards, ground reinforcements and improvements, and soil properties and behaviour are also covered, demonstrating the increasing complexity of modelling arising from state-of-the-art technological developments and increased understanding of similitude principles. A special theme on education presents the latest developments in the use of physical modelling techniques for instructing undergraduate and postgraduate students in geotechnical engineering.
Book Synopsis Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading by : Bruce L. Kutter
Download or read book Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading written by Bruce L. Kutter and published by Springer Nature. This book was released on 2019-01-01 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents work collected through the Liquefaction Experiments and Analysis Projects (LEAP) in 2017. It addresses the repeatability, variability, and sensitivity of lateral spreading observed in twenty-four centrifuge model tests on mildly sloping liquefiable sand. The centrifuge tests were conducted at nine different centrifuge facilities around the world. For the first time, a sufficient number of experiments were conducted to enable assessment of variability of centrifuge test results. The experimental data provided a unique basis for assessing the capabilities of twelve different simulation platforms for numerical simulation of soil liquefaction. The results of the experiments and the numerical simulations are presented and discussed in papers submitted by the project participants. The work presented in this book was followed by LEAP-Asia that included assessment of a generalized scaling law and culminated in a workshop in Osaka, Japan in March 2019. LEAP-2020, ongoing at the time of printing, is addressing the validation of soil-structure interaction analyses of retaining walls involving a liquefiable soil. A workshop is planned at RPI, USA in 2020. .
Book Synopsis Deformation Characteristics of Geomaterials by : V.A. Rinaldi
Download or read book Deformation Characteristics of Geomaterials written by V.A. Rinaldi and published by IOS Press. This book was released on 2015-12-11 with total page 1236 pages. Available in PDF, EPUB and Kindle. Book excerpt: In November 2015, Buenos Aires, Argentina became the location of several important events for geo-professionals, with the simultaneous holding of the 6th International Symposium on Deformation Characteristics of Geomaterials, the 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XV PCSMGE), the 8th South American Congress on Rock Mechanics (SCRM), as well as the 22nd Argentinean Congress of Geotechnical Engineering (CAMSIGXXII). This synergy provided a unique opportunity to exchange ideas and discuss current and future practices in the areas of soil mechanics and rock mechanics, and their applications in civil, energy, environmental, and mining engineering. This book presents the proceedings of the 6th International Symposium on Deformation Characteristics of Geomaterials. As well as 118 articles selected for publication after peer review, it includes 7 lectures delivered by invited keynote speakers and the Third Bishop Lecture, delivered by Professor Herve Di Benedetto of the University of Lyon, France, who presented a reference work on the advanced testing and modeling of bituminous bounded and unbounded granular materials. The conference brought together practitioners, researchers and educators from around the world engaged in the understanding of the deformation properties of geo-materials before failure, and the small strain parameters as fundamental characteristics of geo-materials. The main topics covered by the symposium include experimental investigations from very small strains to beyond failure, including multi-physical approach; HTC M coupling behavior, characterization and modeling of various geo-materials and interfaces; and practical prediction and interpretation of ground responses: field observation and case histories.
Book Synopsis Bio-mediated Soil Improvement and the Effect of Cementation on the Behavior, Improvement, and Performance of Sand by : Brina Mortensen Montoya
Download or read book Bio-mediated Soil Improvement and the Effect of Cementation on the Behavior, Improvement, and Performance of Sand written by Brina Mortensen Montoya and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: New, exciting opportunities for utilizing biological processes to modify the engineering properties of the subsurface (e.g. strength, stiffness) have recently emerged. Enabled by interdisciplinary research at the confluence of microbiology, geochemistry, and civil engineering, this new field has the potential to meet society's ever-expanding needs for innovative treatment processes that improve soil supporting new and existing infrastructure. An overview of bio-mediated improvement systems is presented, identifying the primary components and interplay between different disciplines. Geometric compatibility between soil and microbes that restricts the utility of different systems is identified. Focus is then narrowed to a specific system, namely bio-mediated calcite precipitation of sands. Various microscopy techniques are used to assess how the pore space volume is altered by calcite precipitation, the calcite precipitation is distributed spatially within the pore space, and the precipitated calcite degrades during loading. Non-destructive geophysical process monitoring techniques are described and their utility explored. Next, the extent to which various soil engineering properties is identified through experimental examples. The remainder of the dissertation is focused on utilizing urea hydrolysis to induce calcite precipitation. Work was done to gain an understanding of the environmental factors that affect the growth of the bacterium Sporosarcina pasteurii, the metabolism of the bacterium, and the calcite precipitation induced by this bacterium to optimally implement the biological treatment process in situ. Soil column and batch tests were used to assess the effect of likely subsurface environmental factors on the Micorbial induced calcite precipitation (MICP) treatment process. The results presented herein indicate that the biological treatment process is equally robust over a wide range of soil types, concentrations of ammonium chloride and salinities ranging from distilled water to full seawater; on the time scale of an hour, it is not diminished by the absence of oxygen or lysis of cells containing the urease enzyme. The results advance the biological treatment process MICP towards field implementation by addressing key environmental hurdles faced with during the upscaling process. As previously discussed, non-destructive geophysical process monitoring techniques are utilized during the treatment process. Bender elements are commonly used to monitor the shear wave velocity of soils in laboratory tests. When used in aggressive soil environments, such as MICP treated soil, electromagnetic crosstalk can distort the received bender element signal, preventing accurate shear wave velocity measurements. Under these conditions, the electrical source is transmitted from source to receiver bender, dominating any received shear wave signal propagating through the soil. Bender elements can be constructed to greatly reduce the electromagnetic crosstalk, and simple tests can be performed to help ensure the bender element system is not susceptible to crosstalk. Practical guidelines are presented regarding fabrication, operation, and health monitoring of bender elements that will help ensure clear shear wave velocity measurements in aggressive soil environments. MICP increases the strength and stiffness of loose sand deposits, increasing resistance to seismically-induced soil liquefaction. Experimental tests, including triaxial and centrifuge, were used to assess the increase in shear strength and the resulting improvement in liquefaction susceptibility. Triaxial tests are used to evaluate the evolution of stiffness and strength in specimens subjected to various stress paths. The cementation process is monitored using non-destructive geophysical measurements (i.e. bender elements). Shear response of the treated and untreated samples are evaluated for drained and undrained triaxial specimens subjected to compression, extension, and constant p loading paths. A marked increase in peak stress ratio of up to about 1.5 times that of the untreated samples is observed in moderately cemented samples and up to 1.9 times that of untreated samples for heavily cemented samples. Degradation of the cementation as reflected by changes in stiffness is observed using geophysical monitoring. The results are used to plan centrifuge tests that will evaluate the increased resistance to liquefaction triggering from microbial induced calcite precipitation treatment. Microbial induced calcite precipitation (MICP) binds sand particles together through calcite crystal formation at particle-particle contacts. This results in an increase in the small-strain stiffness and strength of treated loose sand. Geotechnical centrifuge tests were used to evaluate the increased resistance of MICP treated sand relative to untreated loose sand when subjected to seismic shaking. Results of one model with a structure founded on sand treated to a moderate level of cementation and another model with the structure founded on loose untreated sand are compared. The centrifuge models were subjected to ground motions consisting of sine waves with increasing amplitudes. The accelerations, pore pressures, and shear wave velocities measured in the soil during shaking are presented. The resistance to liquefaction and deformation in the MICP treated model showed significant increases, as evidenced by substantial decreases in excess pore pressure ratios and vertical strains beneath the structure.
Book Synopsis Structural Health Monitoring by : Charles R. Farrar
Download or read book Structural Health Monitoring written by Charles R. Farrar and published by John Wiley & Sons. This book was released on 2012-11-19 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by global leaders and pioneers in the field, this book is a must-have read for researchers, practicing engineers and university faculty working in SHM. Structural Health Monitoring: A Machine Learning Perspective is the first comprehensive book on the general problem of structural health monitoring. The authors, renowned experts in the field, consider structural health monitoring in a new manner by casting the problem in the context of a machine learning/statistical pattern recognition paradigm, first explaining the paradigm in general terms then explaining the process in detail with further insight provided via numerical and experimental studies of laboratory test specimens and in-situ structures. This paradigm provides a comprehensive framework for developing SHM solutions. Structural Health Monitoring: A Machine Learning Perspective makes extensive use of the authors’ detailed surveys of the technical literature, the experience they have gained from teaching numerous courses on this subject, and the results of performing numerous analytical and experimental structural health monitoring studies. Considers structural health monitoring in a new manner by casting the problem in the context of a machine learning/statistical pattern recognition paradigm Emphasises an integrated approach to the development of structural health monitoring solutions by coupling the measurement hardware portion of the problem directly with the data interrogation algorithms Benefits from extensive use of the authors’ detailed surveys of 800 papers in the technical literature and the experience they have gained from teaching numerous short courses on this subject.
Book Synopsis Fabrication and Welding Engineering by : Roger Timings
Download or read book Fabrication and Welding Engineering written by Roger Timings and published by Routledge. This book was released on 2008 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers basic sheet-metal fabrication and welding engineering principles and applications. This title includes chapters on non-technical but essential subjects such as health and safety, personal development and communication of technical information. It contains illustrations that demonstrate the practical application of the procedures described.
Download or read book Geo-frontiers 2011 written by and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extrusion written by Harold F. Giles Jr and published by William Andrew. This book was released on 2013-09-21 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Extrusion is designed to aid operators, engineers, and managers in extrusion processing in quickly answering practical day-to-day questions. The first part of the book provides the fundamental principles, for operators and engineers, of polymeric materials extrusion processing in single and twin screw extruders. The next section covers advanced topics including troubleshooting, auxiliary equipment, and coextrusion for operators, engineers, and managers. The final part provides applications case studies in key areas for engineers such as compounding, blown film, extrusion blow molding, coating, foam, and reprocessing. This practical guide to extrusion brings together both equipment and materials processing aspects. It covers basic and advanced topics, for reference and training, in thermoplastics processing in the extruder. Detailed reference data are provided on such important operating conditions as temperatures, start-up procedures, shear rates, pressure drops, and safety. A practical guide to the selection, design and optimization of extrusion processes and equipment Designed to improve production efficiency and product quality Focuses on practical fault analysis and troubleshooting techniques
Book Synopsis Laboratory Design, Construction, and Renovation by : National Research Council
Download or read book Laboratory Design, Construction, and Renovation written by National Research Council and published by National Academies Press. This book was released on 2000-05-12 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory facilities are complex, technically sophisticated, and mechanically intensive structures that are expensive to build and to maintain. Hundreds of decisions must be made before and during new construction or renovation that will determine how successfully the facility will function when completed and how successfully it can be maintained once put into service. This book provides guidance on effective approaches for building laboratory facilities in the chemical and biochemical sciences. It contains both basic and laboratory-specific information addressed to the user communityâ€"the scientists and administrators who contract with design and construction experts. The book will also be important to the design and construction communitiesâ€"the architects, laboratory designers, and engineers who will design the facility and the construction personnel who will build itâ€"to help them communicate with the scientific community for whom they build laboratory facilities.
Download or read book Arthrogryposis written by Lynn T. Staheli and published by Cambridge University Press. This book was released on 1998-04-28 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term arthrogryposis describes a range of congenital contractures that lead to childhood deformities. It encompasses a number of syndromes and sporadic deformities that are rare individually but collectively are not uncommon. Yet, the existing medical literature on arthrogryposis is sparse and often confusing. The aim of this book is to provide individuals affected with arthrogryposis, their families, and health care professionals with a helpful guide to better understand the condition and its therapy. With this goal in mind, the editors have taken great care to ensure that the presentation of complex clinical information is at once scientifically accurate, patient oriented, and accessible to readers without a medical background. The book is authored primarily by members of the medical staff of the Arthrogryposis Clinic at Children's Hospital and Medical Center in Seattle, Washington, one of the leading teams in the management of the condition, and will be an invaluable resource for both health care professionals and families of affected individuals.
Download or read book The Ocean Economy in 2030 written by OECD and published by OECD Publishing. This book was released on 2016-04-27 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report explores the growth prospects for the ocean economy, its capacity for future employment creation and innovation, and its role in addressing global challenges. Special attention is devoted to the emerging ocean-based industries.
Book Synopsis Chemical Grouting And Soil Stabilization, Revised And Expanded by : Reuben H. Karol
Download or read book Chemical Grouting And Soil Stabilization, Revised And Expanded written by Reuben H. Karol and published by CRC Press. This book was released on 2003-04-18 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following shifting trends from remedial to preventive uses of grouting practices, this third edition covers all aspects of chemical grouting methods and applications. This reference highlights new ground improvement techniques as well as recent innovations in soil modification and stabilization procedures. It considers commercial alternatives to ground improvement, their relative advantages and disadvantages, and the engineering applications to which these methods are suited. Revised and expanded, this new edition assesses the role of new grouting techniques in the containment of hazardous waste and introduces numerous problems to illustrate concepts and facilitate instruction.
Book Synopsis Reducing Birth Defects by : Institute of Medicine
Download or read book Reducing Birth Defects written by Institute of Medicine and published by National Academies Press. This book was released on 2003-10-27 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each year more than 4 million children are born with birth defects. This book highlights the unprecedented opportunity to improve the lives of children and families in developing countries by preventing some birth defects and reducing the consequences of others. A number of developing countries with more comprehensive health care systems are making significant progress in the prevention and care of birth defects. In many other developing countries, however, policymakers have limited knowledge of the negative impact of birth defects and are largely unaware of the affordable and effective interventions available to reduce the impact of certain conditions. Reducing Birth Defects: Meeting the Challenge in the Developing World includes descriptions of successful programs and presents a plan of action to address critical gaps in the understanding, prevention, and treatment of birth defects in developing countries. This study also recommends capacity building, priority research, and institutional and global efforts to reduce the incidence and impact of birth defects in developing countries.
Book Synopsis Workplace Violence by : Christina M. Holbrook
Download or read book Workplace Violence written by Christina M. Holbrook and published by Routledge. This book was released on 2018-07-03 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Workplace Violence: Issues in Threat Management defines what workplace violence is, delves into the myths and realities surrounding the topic and provides readers with the latest statistics, thinking, and strategies in the prevention of workplace violence. The authors, who themselves have implemented successful workplace violence protection programs, guide novice and experienced practitioners alike in the development of their own programs.
Book Synopsis Geotechnical Engineering by : Jean-Louis Briaud
Download or read book Geotechnical Engineering written by Jean-Louis Briaud and published by John Wiley & Sons. This book was released on 2013-10-02 with total page 1783 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a leader on the subject, Introduction to Geotechnical Engineering is first introductory geotechnical engineering textbook to cover both saturated and unsaturated soil mechanics. Destined to become the next leading text in the field, this book presents a new approach to teaching the subject, based on fundamentals of unsaturated soils, and extending the description of applications of soil mechanics to a wide variety of topics. This groundbreaking work features a number of topics typically left out of undergraduate geotechnical courses.
Book Synopsis Operational Culture for the Warfighter by : Barak A. Salmoni
Download or read book Operational Culture for the Warfighter written by Barak A. Salmoni and published by Marine Corps. This book was released on 2008 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This textbook is designed to help Marines link concepts of culture to the realities of planning and executing military operations around the world." -- p. 2.
