Head, defined

Footnotes Use footnotes, if necessary, to share information about the whole table, explain column headings, define abbreviations, or provide additional information. Footnotes must be referenced in the table (using, e.g., a superscript a, b, c) footnotes are placed beneath the table (either above or below the bottom horizontal line). Use the same font size in the footnote as in the rest of the table. 

Organosilicon-sulphur compounds will be considered under six headings defined by structure type. Organothiosilanes RnSi(SR )4 , linear and cyclic silthianes with the SiSSi... 

Every column must have a heading that describes the material below it. Be as succinct as possible, keep headings to two lines if possible, and use abbreviations and symbols whenever practical. Be consistent with the text and with other column headings. Define nonstandard abbreviations in table footnotes. Name the variable being measured and indicate the unit of measure after a comma, after a slash, or within enclosing marks. Use the same style within and among all tables. A unit of measure alone is not an acceptable column heading. A unit of measure under a straddle rule, as in Table 1, is acceptable. 

The above Prolog program to compute permutations consists of two procedures ( permutation and append ). Each procedure comprises one or more clauses (two for permutation and two for append ). A clause is terminated by a period. The procedure name is called a predicate. The number of arguments is called the arity (two for permutation and three for append ). Each clause has a head, which is also called a procedure entry point, and may have a body. The head defines the form of the predicate s arguments. The body of a clause consists of goals or procedure calls, which impose conditions for the head to be tme. 

Note To compute the minimum thickness, MAWP, and membrane stress for the spherical portion of an eUipsoidal head, defined as a section within 0.8D centered on the head centerline, use instead of in the preceding equations. is defined as follows ... 

Values based on the conventional activity pH scale as defined by the National Bureau of Standards (U.S.) and pertain to a temperature of 25°C [Ref Bower and Bates, J. Research Natl. Bur. Standards U.S., 55 197 (1955) and Bates and Bower, Anal. Chem., 28 1322 (1956)]. Buffer value is denoted by column headed /3. 

Structures [VI] and [VII], respectively, are said to arise from head-to-tail or head-to-head orientations. In this terminology, the substituted carbon is defined to be the head of the molecule, and the methylene is the tail. Tail-to-tail linking is also possible. The term orienticity is also used to describe positional isomerism. 

In the next section we shall adapt this probability function to the description of a three-dimensional coil. We conclude this section by noting that Eq. (1.21) may be approximated by two other functions which are used elsewhere in this book. For these general relationships we define v to be the number of successes-that is, some specified outcome such as tossing a head-out of n tries and define p as the probability of success in a single try. In this amended notation, Eq. (1.21) becomes... 

If the events are not independent, provision must be made for this, so we define a quantity called the conditional probability. For the probability of a head given the prior event of a head, this is written Ph/h> where the first quantity in the subscript is the event under consideration and that following the slash mark is the prior condition. Thus Pj h probability of a tail following... 

The ASA (now ANSI) performance code for Safety Glazing Materials was revised in 1966 to incorporate these improvements in windshield constmction. The addition of test no. 26 requiring support of a 2.3-kg ball dropped from 3.7 m defined this level of improvement. It was based on a correlation estabUshed between 10-kg, instmmented, head-form impacts on windshields, on 0.6 x 0.9-m flat laminates, and the standard 0.3 x 0.3-m laminate with the 2.3-kg ball (28). Crash cases involving the two windshield interlayer types were matched for car impact speeds and were compared (29). The improved design produced fewer, less extensive, and less severe facial lacerations than those produced in the pre-1966 models. 

Although it has been common practice to specify the pressure loss in ordinary valves in terms of either equivalent length of straight pipe of the same size or velocity head loss, it is becoming more common to specify flow rate and pressure drop characteristics in the same terms as has been the practice for valves designed specifically for control service, namely, in terms of the valve coefficient, C. The flow coefficient of a valve is defined as the volume of Hquid at a specified density that flows through the fully opened valve with a unit pressure drop, eg, = 1 when 3.79 L/min (1 gal /min) pass through the valve... 

It is difficult to determine exactly the areas of localized pressure reductions inside the pump, although much research has been focused on this field. It is easy, however, to measure the total fluid pressure (static plus dynamic) at some convenient point, such as pump inlet flange, and adjust it in reference to the pump centerline location. By testing, it is possible to determine the point when the pump loses performance appreciably, such as 3% head drop, and to define the NPSH at that point, which is referred to as a required NPSH (NPSHR). The available NPSH (NPSHA) indicates how much suction head... 

The abiHty to tailor both head and tail groups of the constituent molecules makes SAMs exceUent systems for a more fundamental understanding of phenomena affected by competing intermolecular, molecular—substrate and molecule—solvent interactions, such as ordering and growth, wetting, adhesion, lubrication, and corrosion. Because SAMs are weU-defined and accessible, they are good model systems for studies of physical chemistry and statistical physics in two dimensions, and the crossover to three dimensions. 

Models Part of the foundation of statistics consists of the mathematical models which characterize an experiment. The models themselves are mathematical ways of describing the probabihty, or relative likelihood, of observing specified values of random variables. For example, in tossing a coin once, a random variable x could be defined by assigning to x the value I for a head and 0 for a tail. Given a fair coin, the probabihty of obsei ving a head on a toss would be a. 5, and similarly for a tail. Therefore, the mathematical model governing this experiment can be written as... 

While the F-N curve is a cumulative illustration, the risk profile shows the expected frequency of accidents of a particular category or level of consequence. The diagonal line is a line of constant risk defined such that the product of expected frequency and consequence is a constant at each point along the line. " As the consequences of accidents go up, the expected frequency should go down in order for the risk to remain constant. As the example illustrates, if a portion of the histogram sticks its head up above the line (i.e., a particular type of accident contributes more than its fair share of the risk), then that risk is inconsistent with the risk presented by other accident types. (Note There is no requirement that you use a line of constant risk other more appropriate risk criteria for your application can be easily defined and displayed on the graph.)... 

The degree of reaction in an axial-flow compressor is defined as the ratio of the change of static head in the rotor to the head generated in the stage... 

For a positive power output, the blade tip speed and whirl veloeity eombination at the inlet must be greater than at the exit. From Equation (8-2), the flow must be radially inward so that eentrifugal effeets may be used. The veloeity exiting from a turbine is eonsidered to be unreeoverable therefore, the utilization faetor is defined as the ratio of the total head to the total head plus the absolute exit veloeity. 

A compressor surges at certain conditions of low flow, and the compressor map, a plot of head versus flow, has a surge line defining the limits. Surge controls help the machine avoid surge by increasing flow. For an air compressor, a simple spill to the atmosphere is sufficient. For a hydrocarbon compressor, recirculation from discharge to suction is used. 

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