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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 74 for “"Sandia"”.
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Planning and control for simulated robotic Sandia hand for the DARPA Robotic Challenge
… of the highly nonlinear ATLAS humanoid robot and Sandia hand as long as accurate optimization and planning systems complement such control.
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Argon diffusion gradients in micas and implications for the thermal history of the Sandia pluton
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Characterization of the Neutron Irradiation System for use in the Low-Dose-Rate Irradiation Facility at Sandia National Laboratories
… placed in a polyethylene shielding for use at Sandia National Laboratories (SNL) Low Dose Rate Irradiation Facility (LDRIF). With a total activity of 0.3 TBq (9 Ci), the source consisted of three recycled 241AmBe sources of different activities that had been combined into a single source. The …
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High Temperature Seismic Monitoring for Enhanced Geothermal Systems - Implementing a Control Feedback Loop to a Prototype Tool by Sandia National Laboratories
Geothermal energy can make an important contribution to the U.S. energy portfolio. Production areas require seismic monitoring tools to develop and monitor production capability. This paper describes modifications made to a prototypical seismic tool to implement improvements that were identified …
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Fluvial processes, beaver activity, and climate in the greater Yellowstone ecosystem and rock type control on hillslope morphology and soil development in the Sandia Mountains, New Mexico
… soil formation and slope morphology in the Sandia Mountains of New Mexico. Resistant rock types have a profound impact on slopes by increasing the amount of coarse colluvium that traps and preserves eolian material. Accretion of eolian material along these slopes limits runoff and prevents …
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Evaluacion del cultivo de sandia (Citrullus lanatus L) variedad Mickey Lee utilizando sustratos mejorados y determinacion de los coeficientes "kc" y ky", bajo riego. Finca Las Mercedes, Managua, 2009
El presente trabajo de investigación se estableció entre los meses de Marzo– Junio 2009, bajo sistema de riego por aspersión en la finca las Mercedes, ubicada en Managua km 11 carretera norte, 2 km entrada al Carnic en las coordenadas 12°10’14” a 12°08’05” de latitud Norte y 86°10’22” a 86°09’44” …
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Computational Analysis of Flow Around a Scaled Axial-Flow Hydro Turbine
… and dynamics involved. Recently, testing of the Sandia turbine, designed by University of California, Davis, Pennsylvania State and Sandia National Laboratories, took place at Pennsylvania State's Applied Research Laboratory. The testing was performed with a 1:8.7 scale model of the Sandia …
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Structural role of nitrogen in phosphorus oxynitride glasses
… from the collaboration of researchers at Sandia National Laboratories, University of Illinois-Urbana and myself at the University of Missouri-Rolla. This author prepared and measured various chemical and thermal properties for the samples used for the Nuclear Magnetic Resonance (NMR) and …
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Evaluation of behavior and the radial shear strength of a reinforced concrete containment structure
… reinforced concrete containment model tested at Sandia National Laboratories. The containment model was pressurized to more than three times its design pressure until a tear in the liner terminated the test. Deformation data from the model test was used to interpret behavior and to estimate the …
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Optimizing Barnes-Hut simulations for many-core super computers using the scalable parallel runtime
… Runtime (SPR) is a project being developed at Sandia National Laboratories which attempts to address the challenge of efficiently utilizing the power of these new many-core systems. SPR is a combination of the Qthreads Library, Portals, and MPI. In this paper, we investigate optimizing the …
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Remote-sensing of underground caverns using a full-Maxwell's equations FDTD model
… the structures, as well as via aerial surveys. Sandia National Labs and the University of New Mexico have collaborated to study the feasibility of detecting and characterizing underground structures, specifically hollow rectangular-shaped caverns. This thesis covers the computational aspects of …
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The impact and fate of aqueous sodium nitrate on hydrocarbon flames
… were simulated using a modified version of the Sandia FORTRAN program for modeling steady laminar one-dimensional premixed flames complete with detailed mechanisms. The results showed that maximum sodium atom concentration in the flame is decreased by an increase in equivalence ratio as well as …
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MEMS spatial light modulator for holographic displays
… (GLV T) and the Polychromator by Honeywell, Sandia, and MIT are examined because they are both diffractive SLMs. A holographic display design is presented that is based on a diffractive SLM that combines the spatial resolution of the GLV with the addressability of the Polychromator. The …
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Time dependent non-extinction probability for fast burst reactors
<p>Sandia National Laboratories has successfully operated fast burst reactors over the past four decades. Fast burst reactors refer to a type of reactor that is able to achieve intense neutron pulses in very short periods of time using fissile material. Typically these systems are comprised of …
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Numerical Modeling of Friction Stir Welding: A Comparison of Alegra and Forge3
… was to evaluate the capabilities of ALEGRA, a Sandia National Labs hydrocode, and Forge3, a Transvalor S.A. product, to accurately model the Friction Stir Welding Process. ALEGRA and Forge3 are discussed in light of the inherent challenges of modeling Friction Stir Welding, and a rotational …
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Numerical Analysis of Biodiesel Combustion in a Direct Injection Compression Ignition Engine
… of the combustion reaction within an optical Sandia/Cummins N14 direct-injection compression ignition engine are conducted. First, validation of the spray model against liquid and vapor penetration data was conducted using a trial and error method. Secondly, the overall engine model was …
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PREDICTING ACTIVATION OF EXPERIMENTS INSIDE THE ANNULAR CORE RESEARCH REACTOR
… of the Annular Core Research Reactor (ACRR) at Sandia National Laboratories and eliminate the need for users to write code. This estimation is achieved by using MCNP to model the neutron fluxes in the reactors central cavity where experiments are conducted using one of the four possible neutron …
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Effect Of Surfaces On Strength Evolution Of Silicon Nanostructures
… results are corroborated by Brad Boyce at Sandia National Laboratories using a completely separate line of testing involving micro-scale, polysilicon devices and the slack chain method. In addition, we demonstrate improvements to the calibration of the strength testing procedure, justify …
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Theoretical Modeling of Radiation-driven Atomic Kinetics of a Neon Photoionized Plasma
… experiments performed at the Z-machine in Sandia National Laboratories. We describe an atomic kinetics model and code, ATOKIN, that was developed and used to compute the atomic level population distribution. The study includes atomic level sensitivity with respect to energy level structure, …
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Modeling and characterization of microelectromechanical systems condenser microphone
… microphones were investigated; firstly, the Sandia Ultraplanar, Multi-level MEMS Technology 5 (SUMMiT V) Condenser microphone was characterized for its membrane displacement with increasing bias voltages. The purpose of this experiment was to investigate the deflection of the membrane and to …
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