Standards table

To facilitate application of the method, Dollimore and Heal gave a standard table of the relevant parameters, based on regular intervals of P extending from 100 A down to 7 A (-values were calculated with Halsey s equation (p. 89). Table 3.2B retains the essential features of their original table, but P no longer extends below 17 A (cf. p. 160) and the /-values are now based on an experimentally determined standard isotherm.(p. 93). [Pg.140]

In using the table for pore size calculations, it is necessary to read off the values of the uptake from the experimental isotherm for the values of p/p° corresponding to the different r values given in the table. Unfortunately, these values of relative pressure do not correspond to division marks on the scale of abscissae, so that care is needed if inaccuracy is to be avoided. This difficulty can be circumvented by basing the standard table on even intervals of relative pressure rather than of r but this then leads to uneven spacings of r . Table 3.6 illustrates the application of the standard table to a specific example—the desorption branch of the silica isotherm already referred to. The resultant distribution curve appears as Curve C in Fig. 3.18. [Pg.145]

Specifications and Standards. Table 35 Hsts specifications for trimesic acid as produced by Amoco Chemical (139). Typically, the product is over 98% pure. [Pg.498]

Values for a and can be found from standard tables for our value of b/a of 0.31 they are 0.46 and 2.8 respectively. Equation (28.10) then tells us that... [Pg.303]

The tolerance grades are interpreted using standard tables (BS EN 20286, 1993) for conversion into dimensional tolerances. However, the tolerance grades do not take into consideration different materials machined or the complexity of the component being processed. [Pg.52]

The U.S. Clean Air Amendments of 1977 define two kinds of air quality standards primary standards, levels that will protect health but not necessarily prevent the other adverse effects of air pollution, and secondary standards, levels that will prevent all the other adverse effects of air pollution (Table 22-7). The amendments also define air quality levels that cannot be exceeded in specified geographic areas for "prevention of significant deterioration" (PSD) of the air of those areas. Although they are called "increments" over "baseline air quality" in the law, they are in effect tertiary standards, which are set at lower ambient levels than either the primary or secondary standards (Table 22-8). [Pg.377]

Equation 2-25 is valid for calculating the head loss due to valves and fittings for all conditions of flows laminar, transition, and turbulent [3], The K values are a related function of the pipe system component internal diameter and the velocity of flow for v-/2g. The values in the standard tables are developed using standard ANSI pipe, valves, and fittings dimensions for each schedule or class [3]. The K value is for the size/type of pipe, fitting, or valve and not for the fluid, regardless of whether it is liquid or gas/vapor. [Pg.77]

Condensing species of relevance to corrosion include water and all acid gases. The dewpoint of water is obtained from standard tables, requiring only the water content (i.e. relative humidity) of the gas stream. Above the water dewpoint, corrosion problems include condensing acids (Section 53.3.2), dry acid gases (Section 53.3.3) and erosion. Below the water dewpoint acid gases dissolve in the water film to create an acidic solution, including ... [Pg.899]

Moisture precipitation Apart from wetting by sea-spray, moisture may either be deposited on a surface by rainfall or dew formation. For a known ambient humidity the dew point can be calculated, using the expression given previously, from standard tables giving the saturated vapour pressure of... [Pg.340]

Resistance of the cable from the pipeline to the power source and from the power source to and along the anodes comprising the groundbed. This cable resistance must be determined from the standard tables supplied by the cable manufacturer. [Pg.213]

The moisture content in the example at 25°C, saturated, was given in standard tables as 0.020 16 kg/kg dry air. This is also termed its specific humidity. [Pg.229]

The function fni(r) given in the standard tables is usually rapidly varying and is therefore difficult to differentiate numerically. The function Fnl[r) is varying much more slowly, and Eq. 11.78 is hence more convenient as the starting point for the numerical work. The accuracy of this method for evaluating the HF energy is now being tested for the atomic case. [Pg.238]

For ease of use and wavelength accuracies of 1-2 nm, organic materials or inorganic ions in solution have been recommended as standards (Table II). However, these must be used carefully because (a) the peak maxima are matrix dependent, (b) narrow Instrumental bandpasses are necessary, (c) impurities may affect peak location, and (d) the peak wavelength values have generally not been certified (11). [Pg.100]

The mouse bioassay for PSP, described in its original form by Sommer in 1937 (29), involves i.p. injection of a test solution, typically 1 mL, into a mouse weighing 17-23 g, and observing the time from injection to death. From the death time and mouse weight, the number of mouse units is obtained by reference to a standard table 1 mouse unit is defined as the amount of toxin that will kill a 20-g mouse in 15 min (77). The sensitivity of the mouse population used is calibrated using reference standard saxitoxin (70). In practice, the concentration of the test solution is adjusted to result in death times of approximately 6 min. Once the correct dilution has been established, 5 mice will generally provide a result differing by less than 20% from the true value at the 95% confidence level. The use of this method for the various saxitoxins and indeterminate mixtures of them would appear... [Pg.50]

January 1992, two working groups have been dealing with analytical methods for the determination of pesticide residues WG 3 Pesticides and PCBs in Fatty Foods and WG 4 Pesticides in Nonfatty Foods . So far analytical methods for 47 pesticides and their metabolites in fatty food and methods for more than 200 pesticides in nonfatty foods have been published in several standards (Table 6). [Pg.112]

The severity of bleeding associated with hemophilia correlates with the degree of factor VIII or factor IX deficiency as measured against the normal plasma standard. Table 64-1 summarizes the age at onset and laboratory and clinical manifestations of hemophilia.3... [Pg.988]

The requirements for interim status incinerators are very similar to the already discussed regulations for permitted units. The interim status regulations, however, are designed to be self-implementing as the facilities are already in operation on the effective date of the standards. Table 23.2 compares the requirements for permitted and interim status incinerators. [Pg.965]

This integral may be broken up into terms that can be evaluated using standard tables. [Pg.261]

To ensure that all aspects of the laboratory s activities are covered over a set period of time, a spreadsheet of activities can be prepared. This shows when each area is due for audit. In order to have a consistent approach, a check-list approach may be adopted. An example of a check-list of aspects which should be examined as part of an internal quality audit is shown in Table 9.5. This can be used as the basis for an audit against any of the Standards already mentioned in this chapter. Not all of the parts will be appropriate for all of the Standards. Table 9.7 expands on what is included in Table 9.5 and can be used to remind auditors and laboratory staff of the things that can affect the quality of a result. [Pg.235]

The NMR spectrum of pseudoephedrine hydrochloride is shown in Figure 2. The spectrum was obtained with a Varian model CFT-20 80 MHz NMR spectrometer. Deuterated DMSO was used as the solvent with tetramethylsilane as an internal standard. Table II gives the NMR assignments consistent with the structure of pseudoephedrine hydrochloride.3... [Pg.492]

NFPA 704 is a voluntary standard. Table 5 lists the five degrees of hazard defined in NFPA 704. The NFPA hazard rating system primarily relies on qualitative criteria and judgment to assign chemical... [Pg.319]

Antioxidants that may be used in foods that are subject to a standard of identity are laid down in the relevant standard (Table 12.9). In the case of food that is not subject to a standard of identity, additives must be used in accordance with the conditions or limits of use specified in regulations.9 For some types of foodstuffs which have standards of identity, the use of antioxidants is not permitted. No antioxidants may be used, for instance, in dairy products, ices, and egg products. [Pg.292]

Another continuing project on aqueous nonelectrolytes is the International Data Series B. The editor is Dr. J. A. Larkin of the National Physical Laboratory in England. It is published in the form of supplements of loose-leaf sheets and issued at irregular intervals of a few months. Each sheet is prepared and submitted by an author or authors. The data are presented in a standard format and must follow certain rules with regard to kind of properties, style, units, and kind of auxiliary information to be included. Standard table formats have been designed for each kind of property included. Each table is reviewed by an editor specially selected from an international panel. [Pg.479]

In the method (ASTM D287), the API gravity is determined using a glass hydrometer for petroleum and petroleum products that are normally handled as liquids and that have a Reid vapor pressure of 26 psi (180 kPa) or less. The API gravity is determined at 15.6°C (60°F), or converted to values at 60°F, by means of standard tables. These tables are not applicable to nonhydrocarbons or essentially pure hydrocarbons such as the aromatics. [Pg.292]

The potential of the mercury-drop working electrode at the point where the current has reached exactly half its maximum value (that is, 1 /2 x /j) is called the halfwave potential ( 1/2). The latter occurs at a potential value that is characteristic of the analyte. A single polarogram is sufficient to both identify the analyte (from the value of 1/2 - comparing it with values in standard tables) and quantify its concentration (from la and a known standard). [Pg.151]

As always, we must first discern or find out (from standard tables) the reaction stoichiometry involved. In this case, addition of ammonia to cupric ion effects the well-known reaction, Cu " -I- 2NH3 -> [Cu(NH3)2] +. [Pg.155]

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