Channel sample

Due to fluctuation of gold assay, the distance between surface channel sampling, should be less than 25 m. 

Grab samples were collected in one gallon amber glass bottles with Teflon-lined caps at depths of 0.5 to 0.1 m. All center channel samples were collected aboard the AquadeJphia, the boat used by the City of Philadelphia for its own river sampling program. 

Routine quantitative petrographic procedures were employed throughout the current study with only minor necessary modifications. Channel samples were collected in the field from each megascopically recognizable coal layer in the bed exposed in strip mines, road cuts, and underground mines. In the laboratory, the samples were crushed to —30 mesh (—590 microns), pelletized... 

Channel samples of Pocahontas No. 3 seam (lvb), Bishop mine, Tazewell County, Va., and Pittsburgh seam (hvab), Pursglove No. 15 mine, Monongalia County, W. Va. coals were collected under nitrogen at the mine face and sent to Bruceton in a closed container filled with nitrogen. 

ASTM D-4596. Standard Practice for Collection of Channel Samples of Coal in a Mine. 

Apparent rank rank designation obtained on samples other man channel samples, but otherwise conforming to procedures of coal classification (ASTM D-388). 

A multi-channel sample instrument or an automatic switching valve can be used when multiple locations or samples need to be monitored simultaneously. For example, such systems have been developed and manufactured which can monitor multiple points from a central location, including both continuous and discrete sampling systems. The systems can be connected to either PC s or process computers for further data processing or for activation of process controllers or operation alarms. 

Sampling. Two sets of vibracores were collected at each site. A previously collected set was used, along with other cores in each area, to determine stratigraphic and sedimentologic relationships. Color, texture, and structure were used to establish different lithofacies, which were later verified or modified using x-ray radiography. Ash and total sulfur contents were then determined for channel samples of these units. 

A second set of vibracores, as well as associated open water samples were collected for more detailed work. Lithologic units were determined employing the criteria used for the first set and channel samples taken for chemical work. In addition, 1 x 2 cm rectangles for petrographic work were cut from the center of each lithostratigraphic unit less than about 25 cm in length. Two samples were taken in thicker units, one at the top and one at the bottom of the unit. Cores were stored in sealed tubes in a walk-in cooler operated at 5° C. 

For our own work, channel samples of Pittsburgh No. 8 coal from the Grafton Mine, Churchville, WV, and Illinois No. 6 coal from the Captain Mine, Percy, IL, were used. Two separate batches, IL6 and IL6A, of the Illinois coal were used. The characteristics of the 2 bituminous coals are listed in Table I. 

Fig. 10. Single-photon response of a RCA 8850 photomultiplier demonstrating the principle of two-channel sampled timing. In all three cases, the channel 1 sampled voltage exceeds the lower level discriminator. In the top example, the channel 2 sample is nearly equal and is accepted. In the other two examples, the current pulses arrive 1 ns late and 1 ns early and the large differences between the two sampled voltages causes these photons to be rejected. (After ref. 57.)...

Figure 17 Comparison of model output for distribution of residue compositions with abyssal peridotites and harzburgites from Oman, (a) Distribution of clinopyroxene compositions in equilibrium with melts at the top of the melting column corresponding to Figure 15. This distribution is sampled uniformly by area (as if we were sampling residues from the top of the column) and is dominated by depleted inter-channel samples, (b) Clinopyroxene compositions in harzburgites from the mantle section of the Oman ophiohte (Kelemen et al., 1995a) superimposed on the range of cpx compositions from abyssal peridotites (Johnson et al., 1990 Johnson and Dick, 1992), showing the predominance of highly depleted samples.

Coal, by virtue of its origin, is quite heterogeneous its mineral content varies considerably both vertically and laterally within coal seams. Vertical variation has resulted from changes through time in the content of mineral detritus introduced into the peat swamp, in the pH, and to some extent in the species of vegetation that inhabited the swamp at any one place or time. This variation has been measured by determining the differences in mineral content in different layers or benches of the seam at particular places. Lateral variation has been measured by analysis of the whole coal seam (channel samples) from one locality to another. 

Mineral Variation of Channel Samples From the Herrin and... 

A11 samples represented the whole coal seam exclusive of major mineral partings. if present (face channel samples). 

Table V. Mineral Composition of Channel Samples from Some U.S. Coal Basins X > JO <...

In October 2005, the number and biomass of larvae were studied in the Western basin, northern part of the Eastern basin and in the channel (Samples were processed by E.S. Bocharova, Russian Institute for Fishery and Oceanography, Moscow). 

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