Achievability condition

Mittasch Stability Test for Nitrocellulose. A test based on the measurement of press developed on decompn of NC. The app may be considered a very complicated modification of devices originated by Abel (Ref 4, p 241) and Hess (Refs 1 4). Abel heated NC samples in vac and detd the press increase. Hess believed that on heating NC in a closed vessel contg air, connected to a Hg manometer, it would be possible to achieve conditions more closely resembling those in storage in closed magazines. Neither of these methods found any practical application... 

The most commonly used LC/MS interfaces in pharmaceutical analysis are ESI and APCI. An ESI interface on the majority of commercial mass spectrometers utilizes both heat and nebulization to achieve conditions in favor of solvent evaporation over analyte decomposition. While ionization in APCI occurs in the gas phase, ionization using ESI occurs in solution. Attributes of a mobile phase such as surface tension, conductivity, viscosity, dielectric constant, flow rate and pFi, all determine the ionization efficiency. They therefore need to be taken into consideration and controlled. 

Premixed ingredients with particle sizes in the 30 to 60 micron range can be efficiently processed with small media mills at profitable flow rates. This is an achievable condition for a wide range of products. 

In the applications that have been discussed here, high rates of transport have, somewhat paradoxically, favored attainment of conditions under which analyses neglecting transport effects can be applied. The rapid transport helps to achieve conditions of uniformity, under which transport no longer is significant, and effects of finite-rate chemistry can be studied. This same kind of situation prevails in various other experiments, such as those employing a suitably designed turbulent-flow reactor [18], [19], [20]. In... 

The need to achieve conditions in which the desired reaction is isolated usually limits the range of temperatures and pressures that can be covered in a particular study but, with modern signal capture and processing methods and advances in modelling the complex chemistry involved, the quality of data from shock tube studies is comparable with that from the lower temperature techniques. 

For its pilot use, the freeze dryer offers full control of the process variables and is able to achieve conditions of pressure and temperature beyond the limits of production units. The shelf and ice condenser temperatures of the pilot unit can be... 

The challenge for those trying to lose weight is to achieve condition number three. 

Note that no assumption is made regarding the attainability of points where rate vectors point out of or are tangent to the hyperplane. It is not possible to discern from the achievability condition, and so points satisfying n r(C) > 0 cannot be excluded from the region on this basis alone. 

The metals immersed in the solution of their simple salts establish the reversible potential. The values of the reversible potentials for different metals could differ for about 3 V. Electrodeposition of metals could take place only at potentials more negative than the reversible ones. Accordingly, in the solutimi of ions of two metals (cf. Cu " " and Zn ) with one being on the positive side of the potential scale (vs. SHE) (Cu) and another one being on the negative side of the potential scale (Zn), intensive electrodeposition of Cu could take place at potentials at which Zn would not electrodeposit at aU. Taking into account that the reversible potentials of metals could change with the presence of different anions in the solution (com-plexation of metal ions) and that the rates of electrodeposition of different metals are usually different, it is possible to achieve conditions for simultaneous electrodeposition of these two metals [1,5]. 

In the zone melting processes, a more likely achieved condition is illustrated via the impurity concentration proffle in the molten zone in Figure 6.3.15(a) the impurity mass fraction Un changes from the value m,/ at the freezing interface (where it is assumed to be in equilibrium with the solid mass fraction Uis o in the newly frozen section ABB A via Mis = K sMi/ o) to Uiib, the impurity mass fraction in the bulk of the melt at a distance Si (usually << /), the boundary layer thickness. Ideally, if the complete molten zone is well mixed, then... 

The condition of steady-state is established. This is a readily achievable condition that is easily met, although long times may be required. 

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