Point of origin

This focal spot diameter is very much smaller than the spots of conventional X-ray tubes. The goodness of a X-ray image is influenced by contrast and sharpness. Caused by the almost punctual point of origin of the X-rays, a low geometrical unsharpness according to equation 1 is reached. 

The body s frame or skeleton is constmcted as a set of levers powered or operated by muscle tissue. A typical muscle consists of a central fibrous tissue portion, and tendons at either end. One end of the muscle, known as the head, is attached to tendon tissue, which is attached to bone that is fixed, and known as the point of origin. The other end of the muscle is attached to a tendon. This tendon is attached to bone that is the moving part of the joint. This end of the muscle is known as the insertion end. An example is the bicep muscle which is coimected to the humems bone of the upper arm at its head or origin. The insertion end of the muscle is coimected to the radius bone of the forearm, otherwise known as the moving part of the elbow joint. 

For combustible dusts, the explosibility limits do not have the same meaning as with flammable gases and flammable vapors, owing to the interaction between dust layers and suspended dust. This protective measure can, for example, be used when dust deposits are avoided in operating areas or in the air stream of clean air lines after filter installations WTiere in normal operation the lower explosibility limit is not reached. However, dust deposits must be anticipated with time. When these dust deposits are whirled up in the air, an explosion hazard can arise. Such a hazard can be avoided by regular cleaning. The dust can be extracted directly at its point of origin by suitable ventilation measures. 

If enelosure or use of a booth is impraetieable, a captor hood is used. This is plaeed some distanee from the souree of pollution and the rate of air flow needs to be sueh as to eapture eontaminants at die furdiermost point of origin. 

Ti = Temperature of the gas at the point of origin, °F W = Thermodynamic flow work term... 

The following analysis enables one to calculate the diameter of a pipeline transporting any compressible fluid. The required inputs are volumetric flow rate, the specific gravity of the gas relative to air, flow conditions, compressibility factor Z where Z is defined by nZRT = PV, the pressure at the point of origin and the destination, the pipe length, and pipe constants such as effective roughness. The working equations have been obtained from the literature. Since the friction factor... 

Jet spread The angle of divergence of a jet from its point of origin. 

Davenport [1] has listed more than 60 major leaks of flammable materials, most of which resulted in serious fires or unconfined vapor cloud explosions. Table 9-1, derived from his data, classifies the leak by point of origin and shows that pipe failures accounted for half the failures— more than half if we exclude transport containers. It is therefore important to know why pipe failures occur. Following, a number of typical failures (or near failures) are discussed. These and other failures, summarized in References 2 and 3, show that by far the biggest single cause of pipe failures has been the failure of construction teams to follow instructions or to do well what was left to their discretion. The most effective way of reducing pipe failures is to ... 

At the transition state for reanangement, the methyl group is partially bonded both to its point of origin and to the car bon that will be its destination. 

Railroads also entered into contracts with shipping lines to deliver containers after they were unloaded at ports. Again, truckers were working with shipping lines and airlines, as well as railroads, to deliver containers or trailers to their final destination. Each of the modes of transportation needed the other to complete the seamless delivery of freight from point of origin to final destination. 

At the flood point, liquid continues to flow down the column, but builds up at a greater rate from tray to tray. Sutherland [69] demonstrated that flooding moves up the column from the point of origin. For this reason it is important to design perforated trays without downcomers with extra care, as changing internal rates are quickly reflected in performance if the proper hole requirements are not met. They are a usefiil tray for steady state operations. 

Optimum suppression of dust/fume at point of origin Enclosure of dust/fume producing processes ... 

Deposit control is important because porous deposits, under the influence of heat flux, can induce the development of high concentrations of boiler water solutes far above their normally beneficial bulk values with correspondingly increased corrosion rates. This becomes an increasingly important feature with increase in boiler saturation temperature. In addition, deposits can cause overheating owing to loss of heat transfer. Finally, carryover of boiler water solutes, which can be either mechanical or chemical, can lead to consequential corrosion in the circuit, either on-load or off-load. Material so transported can result in corrosion reactions far from its point of origin, with costly penalties. It is therefore preferably dealt with by a policy of prevention rather than cure. 

Where corrosion takes place, the origins of the metal oxides and salts formed from corroded boiler system metals should be traced in a systematic fashion to establish cause and effect and avoid misclassify-ing the fundamental waterside problem. Occasionally however, it is difficult to positively confirm the starting point of a corrosion problem because it is common for corrosion products to be transported from their point of origin and deposited elsewhere in the steam-water circuit, or alternatively to act as binders and contribute to fouling and contamination of the overall boiler plant system. 

Any sedimentary deposit or foulant that fails to form a crystalline scale. Often the result of supersaturation or the binding of biological or other organic material with dust, sand, or other mineral deposits. Also, sludge is not always deposited at point of origin and can additionally bake onto heat transfer surfaces. 

Figure 26.39b shows the construction for targeting minimum wastewater treatment flowrate when removal ratio has been specified. If the initial effluent treatment line shown dotted in Figure 26.39b is considered, then there is a point of origin... 

Since positive ions remain near their point of origin, further avalanches are impossible. 

Four courses of action now seem warranted. First, toxic mercurials in agriculture and industry should be replaced by less toxic substitutes. Second, controls should be applied at the point of origin to prevent the discharge of potentially harmful mercury wastes. Third, continued periodic monitoring of mercury in fish and wildlife is needed for identification of potential problem areas, and for evaluation of ongoing mercury curtailment programs. And fourth, additional research is merited on mechanisms of mercury accumulation and detoxification in comparatively pristine ecosystems. 

Combustion will occur which travels from the point of origin throughout the body of the gas and air mixture. Combustion continues until the fuel is exhausted, if sufficient air (i.e., oxygen) is available or until a suppression mechanism interrupts the process. 

Under atmospheric conditions flame travel in an unconfined gas cloud precedes as definite flame front at a determinable velocity. For example, where the ignition point is located in the middle of a volume of a gas, the flame front tends to generally proceed as an expanding sphere from the point of origin. Flame... 

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