Stone terms

The range of systems that have been studied by force field methods is extremely varied. Some force fields liave been developed to study just one atomic or molecular sp>ecies under a wider range of conditions. For example, the chlorine model of Rodger, Stone and TUdesley [Rodger et al 1988] can be used to study the solid, liquid and gaseous phases. This is an anisotropic site model, in which the interaction between a pair of sites on two molecules dep>ends not only upon the separation between the sites (as in an isotropic model such as the Lennard-Jones model) but also upon the orientation of the site-site vector with resp>ect to the bond vectors of the two molecules. The model includes an electrostatic component which contciins dipwle-dipole, dipole-quadrupole and quadrupole-quadrupole terms, and the van der Waals contribution is modelled using a Buckingham-like function. 

Fig. 4J Langmuir plots (a) for propane on 5A zeolite (courtesy Ruthven) (fc) for carbon monoxide on zeolite CaY-54 (courtesy Stone). In (a) the adsorption is expressed in terms of number C of molecules of adsorbate per cavity in (b), as m (stp).

Calcific limestone is generally used by agronomists to denote a high calcium stone. This term can be misleading, however, because its use could suggest pure calcite, which calcitic limestone usually is not. 

Compact limestone is a general term depicting a dense, fine-grained, homogeneous, usually hard type of stone. 

Dolomitic limestone contains considerable MgCO. A tme dolomitic stone contains a ratio of 40—44% MgCO to 54—58% CaCO. However, the term is mote loosely used to denote any carbonate rock that contains mote than 20% MgCO. It varies in color, hardness, and purity. 

Fossiliferous limestone is a general term for any carbonate stone in which the fossil stmcture is visually evident. 

FLigh calcium limestone is a general term for stone that contains largely CaCO and not much (2—5% max) MgCO. It occurs in varying degrees of... 

Trickling Filters. The so-called trickling filter is not a filter but a bed of stones or other coarse material (packing) over which the sewage flows. In terms of the total number of installations, it is the most widely used biological treatment process. However, the greatest total volume of waste is treated by the activity-sludge process (12). 

Packed-Bed Fixed-Film Systems These systems were originaUy termed anaerobic trickhng filters because the first systems were submerged columns filled with stones run under anaerobic conditions (Fig. 25-57). A wide variety of packed media is now used ranging in size from graniiles 40 mesh to 7.5-cm (3—in) stones. Many systems use open structure plastic packing similar to that used in aerobic trickhng filters. 

A great deal of industrial pollution comes from manufacturing products from raw materials—(1) iron from ore, (2) lumber from trees, (3) gasoline from crude oil, and (4) stone from quarries. Each of these manufacturing processes produces a product, along with several waste products which we term pollutants. Occasionally, part or all of the polluting material can be recovered and converted into a usable product. 

The key feature in statistical mechanics is the partition function Just as the wave function is the corner-stone of quantum mechanics (from that everything else can be calculated by applying proper operators), the partition function allows calculation of alt macroscopic functions in statistical mechanics. The partition function for a single molecule is usually denoted q and defined as a sum of exponential terms involving all possible quantum energy states Q is the partition function for N molecules. 

Onager. An ancient weapon consisting of a slinglike catapult which threw stones from a bag or wooden bucket. It was so called after a mythylogical monster, Onager, which was said to throw stones at its pursuers with its feet Ref J. Quick, Dictionary of Weapons and Military Terms , McGraw-Hill, NY (1973), 334... 

Coming." At this time eschatological discourse was co-opted into the service of the esoteric sciences, most especially into alchemical theory in the twelfth century Latin translation of the Turba philosophorum (Arabic original ca. 900 AD). Christian interpolations were added to this text referring to the death and resurrection of the chemicals in apocalyptic terms." The process of distillation in Christian alchemy symbolised death and resurrection, as well as the union of Macrocosm and Microcosm. To the alchemists the death and resurrection of the stone in the manner of a human being was the clearest indication that alchemy was a divine, not a human science. 

Zeisler R, Greenberg RR, Stone SF, Sullivan TM (1988) Long-term stability of the elemental composition of biological materials. Fresenius Z Anal Chem 332 612-615. 

Stone, D.M. Merchant, K.M. Hanson, G.R. and Gibb, J.W. Immediate and long-term effects of 3,4-methylenedioxymethamphetamine on serotonin pathways in brain of rat. Neuropharmacology 26 1677-1683, 1987b. 

Soil properties A Soil texture (sand, silt, clay), organic matter/carbon content, and pH Stones, roots, and hardpans must be largely absent to allow representative sampling of soil profile Soil properties should appear uniform over test site Soil texture data should be available at time of site selection. Soil properties must match study purpose. This can be realistic use conditions, realistic worst-case or worst-case in terms of agrochemical mobility and persistence Must ensure that the majority of samples can be taken from the deepest sampling horizon. Information about sub-soils can be obtained from soil maps, test coring and on-site interviews... 

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