Dikes, types

The program was based on dike-type structures. The structure should be sloping, although a small vertical wall on top of the dike may be included. Some effects of roughness and/or permeability can be included, but not a crest with permeable and rough rock or armour units. In such a case, the structure should be modeled up to the transition to the crest, and other formulae should be used to take into accoimt the effect of the crest. 

Limit the spread of the spilled substance by containing it with a dike. Use an absorbent material appropriate for the type of spill (e.g., polymer-type absorbents such as spill booms, granular materials such as kitty litter, ground corncobs, etc.). 

Figure 1.146, Stre.ss trajectory map.s of southern Northeast Honshu in the late Cenozoic period, after Tsunakawa and Takeuchi (1986) with a slight addition. oh, . trajectory is drawn by smoothing the inferred stress orientations from the selected dike-swarms with K-Ar dates. Selected major faults with age estimation are also shown for indicating types of stress fields. T Extensional stress field, where ay > a 2>cth , and normal or gravity faulting is preferable. P Compre.ssional, oh > ay, reverse or thrust faulting...

The five types of molybdenum deposits include (i) molybdenum and copper porphyry deposits (ii) Quartz vein and pipes (iii) Pegmatites and apatites dikes (iv) Contact-meta-morphic rocks and tactite bodies of silica bearing limestone and (v) Sedimentary rocks containing bedded deposits. 

In the Diels-Alder reaction with inverse electron demand, the overlap of the LUMO of the 1-oxa-l,3-butadiene with the HOMO of the dienophile is dominant. Since the electron-withdrawing group at the oxabutadiene at the 3-position lowers its LUMO dramatically, the cycloaddition as well as the condensation usually take place at room or slightly elevated temperature. There is actually no restriction for the aldehydes. Thus, aromatic, heteroaromatic, saturated aliphatic and unsaturated aliphatic aldehydes may be used. For example, a-oxocarbocylic esters or 1,2-dike-tones for instance have been employed as ketones. Furthermore, 1,3-dicarbonyl compounds cyclic and acyclic substances such as Meldmm s acid, barbituric acid and derivates, coumarins, any type of cycloalkane-1,3-dione, (1-ketoesters, and 1,3-diones as well as their phosphorus, nitrogen and sulfur analogues, can also be ap-... 

From the North Sea strain Bio39 we have isolated the a,p-unsaturated dike-topiperazine 13. The same metabolite has been isolated very recently from a Penicillium sp. [104] however, the NMR data are different. Compounds of this type [105] (14,15) show pronounced antitumor activity however, compound 13 is inactive. Only restricted information is available for similar structures, as these compounds have not been reported often. 

Apparatus. All electrical resistances were measured with an electrolytic conductivity bridge (Leeds and Northrup model 4666) which was constructed according to specifications set forth by Jones (28) and described by Dike (29). The audio-frequency source was a General Radio Co. type 1311-A audio oscillator used with the frequency regulated at 1000 Hz and the output at about 5 V. The detector circuit consisted of a high-gain low-noise tuned amplifier and null detector (General Radio Co. type 1232-A) and an oscilloscope (Heathkit model O-ll) ... 

Many authors have studied anthraxolite and related substances since Vanuxem s first account in 1842 (39). It has been reported as cavity fillings, veins, and dikes and as laminations in rocks of all geologic ages and types on all continents (e.g., I, 15, 20, 31, 32, 37, 38). Except for obvious cases of contact metamorphism near igneous intrusions, earlier workers have generally recognized a fluid origin and low temperature history for these substances. 

Albile is u relatively common and important rock-making mineral associated with the more acid rock types and in pegmatite dikes, often with rarer minerals like tourmaline and beryl. There are many famous localities in Europe in the Swiss and Austrian Alps, the Urals, the Harz Mountains, in Italy, France, and Norway. Brazil has yielded line specimens. In the United States, notable localities arc Paris and Auburn. Maine Chesterfield. Mass. Haddam, Connecticut Amelia County. Virginia and the Pikes Peak region of Colorado. It is used in the ceramic industries and also in the manufacture of artificial teelh. 

In phosphine and arsine complexes of the type LM(diketonate) (M = Ag, Au) and CuL2(dike-tonate), t]2 oxygen bonded diketonate ligands occur in the copper(I) and silver(I) derivatives but the gold(I) analogues feature the jj, carbon bonded form.483... 

The analogy between imines and carbonyls was introduced earlier, and just as 1,3-dike-tonate complexes undergo electrophilic substitution reactions at the 2-position, so do their nitrogen analogues. Reactions of this type are commonly observed in macrocyclic ligands, and many examples are known. Electrophilic reactions ranging from nitration and Friedel-Crafts acylation to Michael addition have been described. Reactions of 1,3-diimi-nes and of 3-iminoketones are well known. The reactions are useful for the synthesis of derivatised macrocyclic complexes, as in the preparation of the nickel(n) complex of a nitro-substituted ligand depicted in Fig. 5-12. 

Investigators learned that one afternoon, a contractor entered the area to start a local ventilation fan in preparation for an unrelated nearby maintenance job. The electrical switch used to start the pump was identical to the type of switch used to start the ventilation fan. Although the switch was labeled, the tag was hard to read. These switches were over 50 feet from the outdoor caustic soda pump installation, well outside of the diked area. The pump continued to run, unnoticed by anyone. There was no instrument in an occupied location indicating that the pump was running. [12]... 

If the oxy-Cope rearrangement is carried out with divinyl diols of type V/27 or V/30 (Scheme V/5), ring-enlarged 1,6-diketones of type V/28 or V/31 are produced [18] [19] [20] [21]. Depending on the ring size of the resulting dike-... 

Germanium and tin form stable, diamagnetic /3-diketonato complexes such as M(acac)2 and M(acac)X, where M is Ge, Sn, and X is Cl or I. The M(dike)2 types can be distilled or sublimed they are soluble and mononuclear in benzene and other hydrocarbon solvents. 

Among the commonest types of diketo complex are those with the stoichiometries M(dike)3 and M(dike)2. The former all have structures based on an octahedral disposition of the six oxygen atoms. The tris(chelate) molecules then actually have >3 symmetry and exist as enantiomers. When there are unsymmetrical diketo ligands (i.e., those with R R"), geometrical isomers also exist, as indicated in (11-XXVI). Such compounds have been of value in investigations of the mechanism of racemiza-tion of tris(chelate) complexes. Chiral diketonate complexes have found many... 

Among seven-coordinate structures, many involve dike-tonate complexes Ln(diket)3 L these generally have either capped-octahedral or capped trigonal prismatic geometry. A considerable number of complexes with neutral donors (e g. thf) of the type LnX3L4 (X = halide, NCS), however, have structures closest to pentagonal bipyramidal, similarly found in the erbium perchlorate complex with 2,6-dimethyl-4-pyrone (Section 3.7.4). 

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