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The oxygen isotopic composition of water extracted from carbonaceous chondrites
The oxygen isotopic composition of water from carbonaceous chondrites suggests that close to isotopic equilibrium was attained on CI and CM parent bodies. This is more consistent with a closed system than one with fluid flow. Tagish Lake does not display such equilibrium
Water monitor system: Phase 1 test report
Automatic water monitor system was tested with the objectives of assuring high-quality effluent standards and accelerating the practice of reclamation and reuse of water. The NASA water monitor system is described. Various components of the system, including the necessary sensors, the sample collection system, and the data acquisition and display system, are discussed. The test facility and the analysis methods are described. Test results are reviewed, and recommendations for water monitor system design improvement are presented
Supercooled Water: Dynamics, Structure and Thermodynamics
The anomalous properties of water in the supercooled state are numerous and
well-known. Particularly striking are the strong changes in dynamic properties
that appear to display divergences at temperatures close to -- but beyond --
the lowest temperatures attainable either experimentally or in computer
simulations. Recent work on slow or glassy dynamics in water suggests analogies
with simple liquids not previously appreciated, and at the same time highlights
some aspects that remain peculiar to water. A comparison of the behavior of
water with normal liquids, with respect to its dynamic, thermodynamic and
structural changes in the supercooled regime is made by analyzing, via computer
simulations, the properties of local potential energy minima sampled by water
in supercooled temperatures and pressures.Comment: Submitted to DAE(India) Solid State Physics Symposium. 4 pages,
Revtex (two column), 6 figures (eps
Electronic Chart of the Future: The Hampton Roads Project
ECDIS is evolving from a two-dimensional static display of chart-related data to a decision support system capable of providing real-time or forecast information. While there may not be consensus on how this will occur, it is clear that to do this, ENC data and the shipboard display environment must incorporate both depth and time in an intuitively understandable way. Currently, we have the ability to conduct high-density hydrographic surveys capable of producing ENCs with decimeter contour intervals or depth areas. Yet, our existing systems and specifications do not provide for a full utilization of this capability. Ideally, a mariner should be able to benefit from detailed hydrographic data, coupled with both forecast and real-time water levels, and presented in a variety of perspectives. With this information mariners will be able to plan and carry out transits with the benefit of precisely determined and easily perceived underkeel, overhead, and lateral clearances. This paper describes a Hampton Roads Demonstration Project to investigate the challenges and opportunities of developing the “Electronic Chart of the Future.” In particular, a three-phase demonstration project is being planned: 1. Compile test datasets from existing and new hydrographic surveys using advanced data processing and compilation procedures developed at the University of New Hampshire’s Center for Coastal and Ocean Mapping/Joint Hydrographic Center (CCOM/JHC); 2. Investigate innovative approaches being developed at the CCOM/JHC to produce an interactive time- and tide-aware navigation display, and to evaluate such a display on commercial and/or government vessels; 3. Integrate real-time/forecast water depth information and port information services transmitted via an AIS communications broadcast
Towards a mesoscopic model of water-like fluids with hydrodynamic interactions
We present a mesoscopic lattice model for non-ideal fluid flows with
directional interactions, mimicking the effects of hydrogen-bonds in water. The
model supports a rich and complex structural dynamics of the orientational
order parameter, and exhibits the formation of disordered domains whose size
and shape depend on the relative strength of directional order and thermal
diffusivity. By letting the directional forces carry an inverse density
dependence, the model is able to display a correlation between ordered domains
and low density regions, reflecting the idea of water as a denser liquid in the
disordered state than in the ordered one
Late Eocene bryozoan faunas in the Alpine-Carpathian region - a comparison
Twelve Priabonian (Late Eocene) bryozoan faunas of the Alps and Carpathians, collected from shallow to deep marine sediments, are compared by similarity indices. High-diversity faunas from shallow bathyal bryozoan marls, where zoaria occur in rock-forming quantity, display the highest similarity - common for deep-water biota - despite their palaeogeographic position on widely separated terranes. Lower-diversity shallow marine faunas reflect less favourable conditions for bryozoan growth
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