Using laboratory methods, we investigate the effect of the presence and mineralogic form of iron on measured proton nuclear magnetic resonance NMR relaxation rates. Five samples of quartz sand were coated with ferrihydrite, goethite, hematite, lepidocrocite, and magnetite. The relaxation rates for these iron-oxide-coated sands saturated with water were measured and compared to the relaxation ra...

To prevent losses during long-distance shipment, a new delivery system was developed for the mosquito parasite Romanomermis culicivorax. A specially designed shipping container, two types of culture media (sand and a mixture of sand, vermiculite, and charcoal [SVC]), and two types of insert (polystyrene and polyester urethane foam [PUF]) were tested. Cultures shipped in SVC/PUF insert combinati...

We examined the processes of calcite nucleation and crystal growth to determine the dominant mechanism for precipitation of calcite in the presence of dissolved organic carbon (DOC). Our experiments, conducted at 25°C and at a Ca:HCO, molar ratio of 1:2, were performed with and without calcite seeds. Scanning electron micrograph observations showed that the particle size of calcite crystals in ...

We present a novel methodology for determining the transport of technetium-99m, a γ-emitting metastable isomer of (99)Tc, through quartz sand and porous media relevant to the disposal of nuclear waste in a geological disposal facility (GDF). Quartz sand is utilized as a model medium, and the applicability of the methodology to determine radionuclide transport in engineered backfill cement is ex...

In this study, a series of nuclear magnetic resonance (NMR) tests was conducted on calcareous sand, quartz and glass bead with wide range grain sizes, to understand the effect size micro-pore structure fractal characteristics carbonate-based sand silicate-based sand. The pore distribution (PSD) tested materials were obtained from NMR T2 spectra, theory introduced describe properties PSD. Result...

Etched track opening geometries in Biotite, Phlogopite and soda-lime glass irradiated with swift heavy ions [197Au(11.64 MeV/n), 136Xe(11.56 MeV/n), 58Ni(11.56 MeV/n)] at different angle of incidence have been studied using appropriate chemical etching technique. Different geometries (Hexagonal, irregular polygon, triangular in case of Biotite and Phlogopite, and circular & elliptical in case o...

[1] Ultramafic xenoliths of spinel dunite, harzburgite, lherzolite, amphibole/phlogopite-bearing pyroxenite, and clinopyroxenite occur in andesitic pyroclastic debris from the 1964 eruption of Shiveluch volcano, Kamchatka. Peridotites have coarse/protogranular, porphyroclastic, and granuloblastic textures, abundant kink-banded olivine, and refractory mineral compositions with forsteritic olivin...

An efficient plant regeneration protocol was developed from leaf and internode (stem) explants of Bacopa monniera L. on MS basal medium, supplemented with Cytokinins like BAP, KN, and TDZ used singly. The leaf cultures expressed maximum plant regeneration potential with 138.9 ± 0.50 shoots per explants on MS + 2.0 mg/ l BAP. The in vitro regenerated dwarf shoots were further elongated on MS med...

The role of spatial distribution of porous medium patchwise chemical (charge) heterogeneity in colloid transport in packed bed columns is investigated. Colloid transport experiments with carboxyl latex particles flowing through columns packed with chemically heterogeneous sand grains were carried out. Patchwise chemical heterogeneity was introduced to the granular porous medium by modifying the...

The cement industry is the major source of cement dust which contains heavy metals like nickel, cobalt, lead, chromium, arsenic and hazardous substances like dioxins and furans. Exposure to these substances can cause health problems to human, animals and vegetation. A continuous pilot scale quartz sand filter was constructed and uses to study the effect of important design parameters (temperatu...