Dement

D. W. Ager and E. R. Dement, Proceedings of the International Symposium on Solvent Extraction in Metallurgical Processes, Technologisch Instituut K. VIV, Antwerp, Belgium, 1972, p. 27. 

Acetyl-i-carnitine (4) is marketed in Italy for dementia as of this writing it is also in Phase III clinical trials in the United States and Europe. In a double-blind, placebo-controUed clinical trial over a one-year period involving 130 patients with clinically diagnosed AD, a slower rate of deterioration in 13 of the 14 outcome measures was observed in the dmg-treated group (28). Earfler smaller scale pilot studies in demented patients had also shown some improvement of various behavioral and cognitive functions (29). 

FIG. 29-69 Three tvpcs of rolling-(dement hearings hall, cylindrical roller, and tapered roller. 

These are special features that can be built into the relay. But each may involve an dement of cost and the relay manufacturers may therefore provide only the essential features as standard and the remaining ones on request. 

Figure 13-17 shows a balanced, single, rotary dement seal mounted onto the pump shaft, pressed against the stationary face and gland, mounted in the seal chamber. Note the individual component parts of the rotary element. 

Atom I he smallest particle of an dement that retains the characteristics of the element. 

Panel A shallow parallel-faced filter dement or cell. 

I9l 3 H. G. J. Moseley observed regularities in the characteristic X ray spectra of the elements he thereby discovered atomic numbers Z and provided justification for the ordina] sequence of the dements. 

The coil demention for polyacrylamide may be obtained from the relation, which is applicable for non-Gaussian coils ... 

Tliree dements. Sulfur (Group 16) is a nonmetal. Antimony (Group 15) is a metalloid silver (Group 11) is a metal. 

The importance of Avogadro s number in chemistry should be clear. It represents the number of atoms of an dement in a sample whose mass in grams is numerically equal to die atomic mass of the dement. Thus there are... 

The calculations in Example 3.4 illustrate an important characteristic of formulas. In one mole of Fe203 there are two moles of Fe (111.7 g) and three moles of O (48.00 g). This is the same as the atom ratio in Fe203,2 atoms Fe 3 atoms O. In general, the subscripts in a formula represent not only the atom ratio in which the different dements are combined but also the mole ratio. 

Sometimes you will be given the mass percents of the elements in a compound. If that is the case, one extra step is involved. Assume a 100-g sample and calculate the mass of each dement in that sample. 

The elements in Groups 13 through 18 (six dements in each period) fill p sublevels, which have a capacity of six electrons. In the second period, the 2p sublevel starts to fill with B (Z = 5) and is completed with Ne (Z = 10). In the third period, the elements A1 (Z = 13) through Ar (Z = 18) fill the 3p subleveL... 

The chemical and physical properties of dements are a periodic function of atomic number. 

This dement is important mainly because of its use as an additive to iron in the manufacture of steel. A few percent of vanadium stabilizes a high-temperature crystal structure of iron so that it persists at room temperature. This form is tougher, stronger, and more resistant to corrosion than ordinary iron. Automobile springs, for example, are often made of vanadium steel. 

Moreover, if we consider atomic numbers instead of atomic weights for the triads discovered in Ihe 19th century, it turns out that the atomic number of Ihe middle element is exactly the average vt the other two elements Indeed, about halt of al Ihe possible triads in the modern periodic table are exact in this sense However many other potential triads are not even approximately correct in that the atomic number of the middle dement is nowhere near Ihe average of Ihe other two... 

This is ihc notion of dements as first emphasized by Antoine Lavoisier in Ihe 1700s, when he called them... 

But there is a second notion, which Mendeleev sometimes called "real dements," in order to indicate their more fundamental status. In Bis sense, Ihe eh emants represent abstract substances that lack what wc normally regard as properties and that represent the form that elements take when they occur in compounds. For example, sodium and chlorine as simple substances—a grey mrt.il and a gicmish gas respectively—are nol literally present in the compound sodium chloride (table salt). Mendeleev would have said Brat sodium and chlorine are present In the compound as the abstract or "real ctemanls. ... 

Dement eva, E. I., et al. (1986). The pH-dependence of the bioluminescence spectra and kinetic constant for luciferase of the firefly Luciola mingre-lica. Biokhimiya 51 130-139. 

A diagonal matrix is a square matrix in which all of the dements which do not lie on the diagonal are equal to zero. Note that the diagonal (or, more exactly, the principal diagonal) is comprised of all the elements Ay for which i =j. 

If v = sup, the interpretation is that A = D — B is nonsingular, provided every diagonal dement exceeds in modulus the sum of the moduli... 

Now consider any principal submatrix of A. This is hermitian, and if a unitary transformation is applied to A so as to diagonalize this submatrix, then the sum of the squares of the diagonal dements of A is increased in the amount of the sum of the squares of the off-diagonal elements of the submatrix. In practice, the submatrices selected are of order 2. If the submatrix... 

As a practical matter, for keeping rounding errors as small as possible, it is to be observed that since the dements just below the diagonal... 

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