A New First Break Picking for Three-Component VSP Data Using Gesture Sensor and Polarization Analysis

A new first break picking for three-component (3C) vertical seismic profiling (VSP) data is proposed to improve the estimation accuracy of first arrivals, which adopts gesture detection calibration and polarization analysis based on the eigenvalue of the covariance matrix. This study aims at addressing the problem that calibration is required for VSP data using the azimuth and dip angle of geophones, due to the direction of geophones being random when applied in a borehole, which will further lead to the first break picking possibly being unreliable. Initially, a gesture-measuring module is integrated in the seismometer to rapidly obtain high-precision gesture data (including azimuth and dip angle information). Using re-rotating and re-projecting using earlier gesture data, the seismic dataset of each component will be calibrated to the direction that is consistent with the vibrator shot orientation. It will promote the reliability of the original data when making each component waveform calibrated to the same virtual reference component, and the corresponding first break will also be properly adjusted. After achieving 3C data calibration, an automatic first break picking algorithm based on the autoregressive-Akaike information criterion (AR-AIC) is adopted to evaluate the first break. Furthermore, in order to enhance the accuracy of the first break picking, the polarization attributes of 3C VSP recordings is applied to constrain the scanning segment of AR-AIC picker, which uses the maximum eigenvalue calculation of the covariance matrix. The contrast results between pre-calibration and post-calibration using field data show that it can further improve the quality of the 3C VSP waveform, which is favorable to subsequent picking. Compared to the obtained short-term average to long-term average (STA/LTA) and the AR-AIC algorithm, the proposed method, combined with polarization analysis, can significantly reduce the picking error. Applications of actual field experiments have also confirmed that the proposed method may be more suitable for the first break picking of 3C VSP. Test using synthesized 3C seismic data with low SNR indicates that the first break is picked with an error between 0.75 ms and 1.5 ms. Accordingly, the proposed method can reduce the picking error for 3C VSP data

Safety and Reliability - Safe Societies in a Changing World

The contributions cover a wide range of methodologies and application areas for safety and reliability that contribute to safe societies in a changing world. These methodologies and applications include: - foundations of risk and reliability assessment and management - mathematical methods in reliability and safety - risk assessment - risk management - system reliability - uncertainty analysis - digitalization and big data - prognostics and system health management - occupational safety - accident and incident modeling - maintenance modeling and applications - simulation for safety and reliability analysis - dynamic risk and barrier management - organizational factors and safety culture - human factors and human reliability - resilience engineering - structural reliability - natural hazards - security - economic analysis in risk managemen

STS analysis of natural gas development in the United States

Thesis (Ph. D. in History, Anthropology, and Science, Technology and Society (HASTS))--Massachusetts Institute of Technology, Program in Science, Technology and Society, 2011.Page 689 blank. Cataloged from PDF version of thesis.Includes bibliographical references (p. 652-688).Natural gas extraction in the United States in the early 21st century has transformed social, physical, legal and biological landscapes. The technique of hydraulic fracturing, which entails the high-pressure injection into subsurface shale formations of synthetic chemical mixtures, has been viewed by the natural gas industry as a practice of great promise. But there is another side to the story. The first half of this dissertation explores an innovative scientific approach to studying the possible deleterious impacts on human health and the environment of the release of chemicals used in gas extraction. Via participant-observation within a small scientific advocacy organization, The Endocrine Disruption Exchange (TEDX), I follow the development of a database of chemicals used in natural gas extraction, a database that seeks to document not only what these chemicals are (many are proprietary), but also what sorts of bodily and ecological effects these substances may have. I analyze ethnographically how TEDX transformed an information vacuum around fracturing and generated fierce regional and national debates about the public health effects of this activity. The second portion of the dissertation expands TEDX's databasing methodology by reporting on a set of online user-generated databasing and mapping tools developed to interconnect communities encountering the corporate forces and chemical processes animating gas development. Shale gas extraction is an intensive technological practice and requires the delicate calibration of corporate, governmental, and legal apparatuses in order to proceed. The industry operates at county, state, and federal levels, and has in many instances been able to organize regulatory environments suited to rapid and lucrative gas extraction. In the midst of such multi-scalar deterritorializing forces, communities may have little legal or technical recourse if they think that they have been subject to chemical and corporate forces that undermine their financial, bodily, and social security. ExtrAct, a research group I co-founded and directed with artist and technologist Chris Csikszentmihalyi, sought to intervene in these processes by developing a suite of online mapping and databasing tools through which "gas patch" communities could share information, network, study and respond to industry activity across states. Using ExtrAct as an example this dissertation explores how social sciences and the academy at large can invest in developing research tools, methods, and programs designed for non-corporate ends, perhaps redressing in the process the informational and technical imbalances faced by communities dealing with large-scale multinational industries whose infrastructure and impacts are largely invisible to public scrutiny. The dissertation describes one potential method for such engaged scientific and social scientific research: an iterative, ethnographically informed process that I term "STS in Practice."by Sara Ann Wylie.Ph.D.in History, Anthropology, and Science, Technology and Society (HAST

The Practice of Change

PhD dissertation submitted to Keio University Graduate School of Media & GovernanceOver the last century civilization has systematically supported a market based approach to developing technical, financial, social and legal tools that focus on efficiency, growth and productivity. In this manner we have achieved considerable progress on some of the most pressing humanitarian challenges, such as eradicating infectious diseases and making life easier and more convenient. However, we have often put our tools and methods to use with little regard to their systemic or long-term effects, and have thereby created a set of new, interconnected, and more complex problems. Our new problems require new approaches: new understanding, solution design and intervention. Yet we continue to try to solve these new problems with the same tools that caused them. Therefore in my dissertation I ask: How can we understand and effectively intervene in interconnected complex adaptive systems? In particular, my thesis presents through theory and practice the following contributions to addressing these problems: 1. A post-Internet framework for understanding and intervening in complex adaptive systems. Drawing on systems dynamics, evolutionary dynamics and theory of change based on causal networks, I describe a way to understand and suggest ways to intervene in complex systems. I argue that an anti-disciplinary approach and paradigm shifts are required to achieve the outcomes we desire. 2. Learnings from the creation and management of post-Internet organizations that can be applied to designing and deploying interventions. I propose an architecture of layers of interoperability to unbundle complex, inflexible, and monolithic systems and increase competition, cooperation, generativity, and flexibility. I argue that the Internet is the best example of this architecture and that the Internet has provided an opportunity to deploy this architecture in other domains. I demonstrate how the Internet has has made the world more complex but through lowering the cost of communication and collaboration has enabled new forms of organization and production. This has changed the nature of our interventions. 3. How and why we must change the values of society from one based on the measurement of financial value to flourishing and robustness. The paradigm determines what we measure and generates the values and the goals of a system. Measuring value financially has created a competitive market-based system that has provided many societal benefits but has produced complex problems not solvable through competitive market-based solutions. In order to address these challenges, we must shift the paradigm across our systems to focus on a more complex measure of flourishing and robustness. In order to transcend our current economic paradigm, the transformation will require a movement that includes arts and culture to transform strongly held beliefs. I propose a framework of values based on the pursuit of flourishing and a method for transforming ourselves. Reflecting on my work experience, I examine my successes and failures in the form of learnings and insights. I discuss what questions are outstanding and conclude with a call to action with a theory of change; we need to bring about a fundamental normative shift in society through communities, away from the pursuit of growth for growth’s sake and towards a sustainable sensibility of flourishing that can draw on both the historical examples and the sensibilities of some modern indigenous cultures, as well as new values emerging from theoretical and practical progress in science