Stem terms

The nomenclature of simple waxes is based on the stem name of the FA. The FA suffix -ic acid is replaced with -ate. This stem term is then followed by... 

Heterocyclic compounds with up to ten ring members are generally named by the extended HW System. In order to do this, a hetero symbol (or several of these symbols) from the table of V terms (Table 4) is combined (eliding the final V ) with a stem term of the following Table 5 that indicates both ring size and degree of saturation. (Unsaturation here means maximum number of non-cumulative double bonds - mancude.)... 

In contrast, epoxides, ozonides, and certain halogen derivatives are characterized by anionized name forms of the added atoms (or groups of atoms) placed behind the stem terms. It should be noted, though, that retention of this method is not recommended when other types of nomenclature (substitutive or heterocycle nomenclature) permit unambiguous simpler names. 

All prefixes encoding explicit statements about the structure of a pertinent acyclic or cyclic parent system are incorporated into the stem terms, i. e. treated as non-detachable parts of a name. 

Gilman [124] and Westwood and Hitch [135] have applied the cleavage technique to a variety of crystals. The salts studied (with cleavage plane and best surface tension value in parentheses) were LiF (100, 340), MgO (100, 1200), CaFa (111, 450), BaFj (111, 280), CaCOa (001, 230), Si (111, 1240), Zn (0001, 105), Fe (3% Si) (100, about 1360), and NaCl (100, 110). Both authors note that their values are in much better agreement with a very simple estimate of surface energy by Bom and Stem in 1919, which used only Coulomb terms and a hard-sphere repulsion. In more recent work, however, Becher and Freiman [126] have reported distinctly higher values of y, the critical fracture energy. ... 

The interaction of an electrolyte with an adsorbent may take one of several forms. Several of these are discussed, albeit briefly, in what follows. The electrolyte may be adsorbed in toto, in which case the situation is similar to that for molecular adsorption. It is more often true, however, that ions of one sign are held more strongly, with those of the opposite sign forming a diffuse or secondary layer. The surface may be polar, with a potential l/, so that primary adsorption can be treated in terms of the Stem model (Section V-3), or the adsorption of interest may involve exchange of ions in the diffuse layer. 

The stem correction may be avoided by employing a thermometer with a short scale (sometimes termed an Anschutz thermometer) and of such size that the entire column of mercury is immersed in the vapour or in the liquid. In practice, it is generally more convenient to use thermometers which have been graduated for partial immersion for a short and con-... 

The term acjdoin is commonly used as a class name for the symmetrical keto-alcohols RCOCH(OH)R, and the name of the individual compound Is derived by adding the suffix oin to the stem name of the acid to which the acyloin corresponds, e.g., acetoin, propionoin, butyroin, etc. 

Cassettes Cassette is a term used to describe two different cross-flow membrane devices. The less-common design is a usually large stack of membrane separated by a spacer, with flow moving in parallel across the membrane sheets. This variant is sometimes referred to as a flat spiral, since there is some similarity in the way feed and permeate are handled. The more common cassette has long been popular in the pharmaceutical and biotechnical field. It too is a stack of flat-sheet membranes, but the membrane is usually connected so that the feed flows across the membrane elements in series to achieve higher conversion per pass. Their popularity stems from easy direct sc e-up from laboratoiy to plant-scale equipment. Their hmitation is that fluid management is inherently veiy hmited and inefficient. Both types of cassette are veiy compact and capable of automated manufacture. 

The STEM instrument itself can produce highly focused high-intensity beams down to 2 A if a field-emission source is used. Such an instrument provides a higher spatial resolution compositional analysis than any other widely used technique, but to capitalize on this requires very thin samples, as stated above. EELS and EDS are the two composition techniques usually found on a STEM, but CL, and even AES are sometimes incorporated. In addition simultaneous crystallographic information can be provided by diffraction, as in the TEM, but with 100 times better spatial resolution. The combination of diffraction techniques and analysis techniques in a TEM or STEM is termed Analytical Electron Microscopy, AEM. A well-equipped analytical TEM or STEM costs well over 1,000,000. 

In hardwoods, morphological structural elements in longitudinal series comprise the segmented structure termed vessel . Vessels, which are exposed in transverse section, constitute about 10-46% of the stem volume in deciduous hardwoods and are cells of relatively large diameters (50-300 p.m). Vessels have in short the appearance of open vertical tubes within the wood structure because their end walls have partially dissolved. By comparison, the hardwood vessel diameter can be as much a 10 times the diameter of a softwood fiber. 

The necessary containment or transport capability of a local ventilation sy stem depends on the type of contaminant present and its health risks. There could be different demands for gases and particles, for contaminants that have immediate health risks and those that have long-term effects, for contaminants that affect the breathing system and those that affect the skin and eyes, for infectious contaminants, fot contaminants that follow the air streamlines closely and those that fall out on floor and work surfaces, etc. (See Chapter 5 for physiological and toxicological considerations.)... 

The definition of nonconformity in ISO 8402 states that it is the nonfulfillment of specified requirements therefore a nonconforming product is one that does not conform to the specified requirements. Specified requirements are either requirements prescribed by the customer and agreed by the supplier in a contract for products or services, or are requirements prescribed by the supplier which are perceived as satisfying a market need. This limits the term nonconformity to situations where you have failed to meet customer requirements. However, ISO 8402 1987 suggests that nonconformity also applies to the absence of one or more quality system elements, but clearly the requirements of clause 4.13 cannot be applied to nonconformity with quality s /stem requirements. Both ISO 9001 and ISO 9004 only address nonconformity in the context of products, processes, and services and when addressing quality system elements the term deficiencies is used. Some auditors use the term nonconformity to describe a departure from the requirements of ISO 9001 but it would be preferable if they chose the term noncompliance to avoid any confusion. The requirements of clause 4.13 therefore only apply to products, processes, and services and not to activities, quality system elements, or procedures. 

The small size of lithium frequently confers special properties on its compounds and for this reason the element is sometimes termed anomalous . For example, it is miscible with Na only above 380° and is immiscible with molten K, Rb and Cs, whereas all other pairs of alkali metals are miscible with each other in all proportions. (The ternary alloy containing 12% Na, 47% K and 41% Cs has the lowest known mp, —78°C, of any metallic system.) Li shows many similarities to Mg. This so-called diagonal relationship stems from the similarity in ionic size of the two elements / (Li ) 76pm, / (Mg ) 72pm, compared with / (Na ) 102pm. Thus, as first noted by Arfvedson in establishing lithium as a new element, LiOH and LiiCOs are much less soluble than the corresponding... 

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