75 FR 52060 - Qualification of Drivers; Exemption Renewals; Vision

Federal Register 2010, 2011, 2012, 2013, 2014

2010-08-24

...., Delmas C. Bergdoll, Kenneth J. Bernard, Allen G. Bors, Brad T. Braegger, Michael C. Branham, John E. Breslin, Trixie L. Brown, Raymond L. Brush, Scott F. Chalfant, Leroy A. Chambers, Harvis P. Cosby, Rodney... L. Tysseling, Kenneth E. Walker and Richard G. Wendt. In accordance with 49 U.S.C. 31136(e) and...

Redstone Test Stand Accepted Into National Register of Historical Places

NASA Technical Reports Server (NTRS)

1976-01-01

On October 02, 1976, Marshall Space Flight Center's (MSFC) Redstone test stand was received into the National Registry of Historical Places. Photographed in front of the Redstone test stand are Dr. William R. Lucas, MSFC Center Director from June 15, 1974 until July 3, 1986, as he is accepting a certificate of registration from Madison County Commission Chairman James Record, and Huntsville architect Harvie Jones.

Around Marshall

NASA Image and Video Library

1976-10-02

On October 02, 1976, Marshall Space Flight Center’s (MSFC) Redstone test stand was received into the National Registry of Historical Places. Photographed in front of the Redstone test stand are Dr. William R. Lucas, MSFC Center Director from June 15, 1974 until July 3, 1986, as he is accepting a certificate of registration from Madison County Commission Chairman James Record, and Huntsville architect Harvie Jones.

Redstone Test Stand Accepted Into National Register of Historical Places

NASA Technical Reports Server (NTRS)

1976-01-01

On October 02, 1976, Marshall Space Flight Center's (MSFC) Redstone test stand was received into the National Registry of Historical Places. Photographed in front of the Redstone test stand along with their wives are (left to right), Madison County Commission Chairman James Record, Dr. William R. Lucas, MSFC Center Director from June 15, 1974 until July 3, 1986, (holding certificate), Ed, Buckbee, Space and Rocket Center Director; Harvie Jones, Huntsville Architect; Dick Smith; and Joe Jones.

Around Marshall

NASA Image and Video Library

1976-10-02

On October 02, 1976, Marshall Space Flight Center’s (MSFC) Redstone test stand was received into the National Registry of Historical Places. Photographed in front of the Redstone test stand along with their wives are (left to right), Madison County Commission Chairman James Record, Dr. William R. Lucas, MSFC Center Director from June 15, 1974 until July 3, 1986, (holding certificate), Ed, Buckbee, Space and Rocket Center Director; Harvie Jones, Huntsville Architect; Dick Smith; and Joe Jones.

An isopiestic study of aqueous NaBr and KBr at 50 °C: Chemical equilibrium model of solution behavior and solubility in the NaBr-H 2O, KBr-H 2O and Na-K-Br-H 2O systems to high concentration and temperature

NASA Astrophysics Data System (ADS)

Christov, Christomir

2007-07-01

The isopiestic method has been used to determine the osmotic coefficients of the binary solutions NaBr-H 2O (from 0.745 to 5.953 mol kg -1) and KBr-H 2O (from 0.741 to 5.683 mol kg -1) at the temperature t = 50 °C. Sodium chloride solutions have been used as isopiestic reference standards. The isopiestic results obtained have been combined with all other experimental thermodynamic quantities available in literature (osmotic coefficients, water activities, bromide mineral's solubilities) to construct a chemical model that calculates solute and solvent activities and solid-liquid equilibria in the NaBr-H 2O, KBr-H 2O and Na-K-Br-H 2O systems from dilute to high solution concentration within the 0-300 °C temperature range. The Harvie and Weare [Harvie C., and Weare J. (1980) The prediction of mineral solubilities in naturalwaters: the Na-K-Mg-Ca-Cl-SO 4-H 2O system from zero to high concentration at 25 °C. Geochim. Cosmochim. Acta44, 981-997] solubility modeling approach, incorporating their implementation of the concentration-dependent specific interaction equations of Pitzer [Pitzer K. (1973) Thermodynamics of electrolytes. I. Theoretical basis and general equations. J. Phys. Chem.77, 268-277] is employed. The model for binary systems is validated by comparing activity coefficient predictions with those given in literature, and not used in the parameterization process. Limitations of the mixed solutions model due to data insufficiencies are discussed. This model expands the variable temperature sodium-potassium model of Greenberg and Moller [Greenberg J., and Moller N. (1989) The prediction of mineral solubilities in natural waters: a chemical equilibrium model for the Na-K-Ca-Cl-SO 4-H 2O system to high concentration from 0 to 250 °C. Geochim. Cosmochim. Acta53, 2503-2518] by evaluating Br - pure electrolyte and mixing solution parameters and the chemical potentials of three bromide solid phases: NaBr-2H 2O (cr), NaBr (cr) and KBr (cr).

Reactive transport simulation via combination of a multiphase-capable transport code for unstructured meshes with a Gibbs energy minimization solver of geochemical equilibria

NASA Astrophysics Data System (ADS)

Fowler, S. J.; Driesner, T.; Hingerl, F. F.; Kulik, D. A.; Wagner, T.

2011-12-01

We apply a new, C++-based computational model for hydrothermal fluid-rock interaction and scale formation in geothermal reservoirs. The model couples the Complex System Modelling Platform (CSMP++) code for fluid flow in porous and fractured media (Matthai et al., 2007) with the Gibbs energy minimization numerical kernel GEMS3K of the GEM-Selektor (GEMS3) geochemical modelling package (Kulik et al., 2010) in a modular fashion. CSMP++ includes interfaces to commercial file formats, accommodating complex geometry construction using CAD (Rhinoceros) and meshing (ANSYS) software. The CSMP++ approach employs finite element-finite volume spatial discretization, implicit or explicit time discretization, and operator splitting. GEMS3K can calculate complex fluid-mineral equilibria based on a variety of equation of state and activity models. A selection of multi-electrolyte aqueous solution models, such as extended Debye-Huckel, Pitzer (Harvie et al., 1984), EUNIQUAC (Thomsen et al., 1996), and the new ELVIS model (Hingerl et al., this conference), makes it well-suited for application to a wide range of geothermal conditions. An advantage of the GEMS3K solver is simultaneous consideration of complex solid solutions (e.g., clay minerals), gases, fluids, and aqueous solutions. Each coupled simulation results in a thermodynamically-based description of the geochemical and physical state of a hydrothermal system evolving along a complex P-T-X path. The code design allows efficient, flexible incorporation of numerical and thermodynamic database improvements. We demonstrate the coupled code workflow and applicability to compositionally and physically complex natural systems relevant to enhanced geothermal systems, where temporally and spatially varying chemical interactions may take place within diverse lithologies of varying geometry. Engesgaard, P. & Kipp, K. L. (1992). Water Res. Res. 28: 2829-2843. Harvie, C. E.; Møller, N. & Weare, J. H. (1984). Geochim. Cosmochim. Acta 48

Thermodynamic Study of Solid-Liquid Equilibrium in NaCl-NaBr-H2O System at 288.15 K

NASA Astrophysics Data System (ADS)

Li, Dan; Meng, Ling-zong; Deng, Tian-long; Guo, Ya-fei; Fu, Qing-Tao

2018-06-01

The solubility data, composition of the solid solution and refractive indices of the NaCl-NaBr-H2O system at 288.15 K were studied with the isothermal equilibrium dissolution method. The solubility diagram and refractive index diagram of this system were plotted at 288.15 K. The solubility diagram consists of two crystallization zones for solid solution Na(Cl,Br) · 2H2O and Na(Cl,Br), one invariant points cosaturated with two solid solution and two univariant solubility isothermal curves. On the basis of Pitzer and Harvie-Weare (HW) chemical models, the composition equations and solubility equilibrium constant equations of the solid solutions at 288.15 K were acquired using the solubility data, the composition of solid solutions, and binary Pitzer parameters. The solubilities calculated using the new method combining the equations are in good agreement with the experimental data.