Evaluation of Low Permeability, Naturally Fractured Carbonate Reservoir with Pressure Transient Analysis

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NASA/ASEE Summer Faculty Fellowship Program, 1990, Volume 1

The 1990 Johnson Space Center (JSC) NASA/American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program was conducted by the University of Houston-University Park and JSC. A compilation of the final reports on the research projects are presented. The topics covered include: the Space Station; the Space Shuttle; exobiology; cell biology; culture techniques; control systems design; laser induced fluorescence; spacecraft reliability analysis; reduced gravity; biotechnology; microgravity applications; regenerative life support systems; imaging techniques; cardiovascular system; physiological effects; extravehicular mobility units; mathematical models; bioreactors; computerized simulation; microgravity simulation; and dynamic structural analysis

Alternative Ground-Motion Model for the Central and Eastern North America Using a New Hybrid Broadband Simulation Technique

Two main objectives have been studied in this dissertation are proposing a hybrid broadband (HBB) earthquake simulation method and the development of alternative ground-motion prediction equations (GMPEs) for central and eastern North America (CENA). Providing such equations, which represents the expected ground shaking levels from earthquake sources, are important as those are being implemented in the probabilistic seismic hazard and risk analysis, and therefore they are financially contributed in the design and construction of structures and infrastructures. This research has two major part. In the first part, a new platform to generate earthquake time histories is developed based on a hybrid broadband simulation technique. The generation of artificial time histories is a promising solution in the absence of the sufficient and appropriate recorded seismograms. Due to lack of recorded strong ground motions in CENA, generation of synthetic seismograms is inevitable in engineering (e.g., time history analyses of structures) and engineering seismology (e.g., GMPEs development) applications. The proposed method incorporated the kinematic earthquake source model, deterministic wave propagation (using discrete wavenumber/finite element technique), and the stochastic finite-fault method to make a suite of appropriate seismic time histories. A new set of GMPEs is developed for CENA in the second part of this study. The proposed comprehensive framework for HBB simulation technique is implemented to develop the new hybrid empirical GMPEs. Hybrid empirical estimates are derived using the regional adjustment factors between two regions (host and target) along with empirical GMPEs from the host region. In this study, western United States and CENA are considered as the host and target regions, respectively. Modeling parameter variability is considered in ground-motion simulations and GMPEs development. Ground-motion models are developed for the earthquake magnitude range of 5–8, in the distance range of 2–1000 km, and for the reference rock site condition with Vs30 = 3 km/s for CENA. The products of this research may contribute to update the future national seismic hazard maps developed by U.S. Geological Survey (USGS) and upcoming building codes

Integration of tools for the Design and Assessment of High-Performance, Highly Reliable Computing Systems (DAHPHRS), phase 1

Systems for Space Defense Initiative (SDI) space applications typically require both high performance and very high reliability. These requirements present the systems engineer evaluating such systems with the extremely difficult problem of conducting performance and reliability trade-offs over large design spaces. A controlled development process supported by appropriate automated tools must be used to assure that the system will meet design objectives. This report describes an investigation of methods, tools, and techniques necessary to support performance and reliability modeling for SDI systems development. Models of the JPL Hypercubes, the Encore Multimax, and the C.S. Draper Lab Fault-Tolerant Parallel Processor (FTPP) parallel-computing architectures using candidate SDI weapons-to-target assignment algorithms as workloads were built and analyzed as a means of identifying the necessary system models, how the models interact, and what experiments and analyses should be performed. As a result of this effort, weaknesses in the existing methods and tools were revealed and capabilities that will be required for both individual tools and an integrated toolset were identified

Report on research and technology-FY 1981

More than 65 technical reports, papers, and articles published by personnel and contractors at the Dryden Flight Research Center are listed. Activities performed for the Offices of Aeronautics and Space Technology, Space and Terrestrial Applications, Space Transportation Systems, and Space Tracking and Data Systems are summarized. Preliminary stability and control derivatives were determined for the shuttle orbiter at hypersonic speeds from the data obtained at reentry. The shuttle tile tests, spin research vehicle nose shapes flight investigations, envelope expansion flights for the Ames tilt rotor research aircraft, and the AD-1 oblique wing programs were completed as well as the KC-135 winglet program

spGARCH: An R-Package for Spatial and Spatiotemporal ARCH models

In this paper, a general overview on spatial and spatiotemporal ARCH models is provided. In particular, we distinguish between three different spatial ARCH-type models. In addition to the original definition of Otto et al. (2016), we introduce an exponential spatial ARCH model in this paper. For this new model, maximum-likelihood estimators for the parameters are proposed. In addition, we consider a new complex-valued definition of the spatial ARCH process. From a practical point of view, the use of the R-package spGARCH is demonstrated. To be precise, we show how the proposed spatial ARCH models can be simulated and summarize the variety of spatial models, which can be estimated by the estimation functions provided in the package. Eventually, we apply all procedures to a real-data example

Tsunami hazard assessment in the Ionian Sea due to potential tsunamogenic sources – results from numerical simulations

In spite of the fact that the great majority of seismic tsunami is generated in ocean domains, smaller basins like the Ionian Sea sometimes experience this phenomenon. In this investigation, we study the tsunami hazard associated with the Ionian Sea fault system. <br><br> A scenario-based method is used to provide an estimation of the tsunami hazard in this region for the first time. Realistic faulting parameters related to four probable seismic sources, with tsunami potential, are used to model expected coseismic deformation, which is translated directly to the water surface and used as an initial condition for the tsunami propagation. <br><br> We calculate tsunami propagation snapshots and mareograms for the four seismic sources in order to estimate the expected values of tsunami maximum amplitudes and arrival times at eleven tourist resorts along the Ionian shorelines. <br><br> The results indicate that, from the four examined sources, only one possesses a seismic threat causing wave amplitudes up to 4 m at some tourist resorts along the Ionian shoreline