Static phase

It is important to realize that all static phases will contribute to retention and, as a result, a number of different distribution coefficients will control the retention of the solute. Nevertheless, the situation can be simplified to some extent. The static interstitial volume (Vi(s)) and the pore volume fraction (Vp(i)) will contain mobile... 

Interstitial Static Phase volume, by difference Total Pore Volume. By Difference... 

The static phase, for a silica gel column, would consist almost entirely of that portion of the mobile phase that is trapped in the pores of the silica gel. Consequently, it would appear reasonable to assume that, in equation (1),... 

Racemic mixtures of compounds of the type 26-28 (see Table 4) could be resolved by HPLC using a chiral static phase, and the configuration was determined by circular dichroism258. 

Is the Sun then eternal And if not, what stage has it reached in its evolution In fact, the Sun is in the simplest and longest-lasting phase of a star s evolution, the quasi-static phase of core hydrogen burning, referred to as the main sequence. 

The internal volume of a column is occupied by three substances, the mobile phase, the stationary phase and the support. The term mobile phase is a misnomer as it impfies that all the mobile phase is moving, which is not so. The mobile phase within the pores is also stationary and thus constitutes part of the stationary phase. Nevertheless, it is such a well established term, it will still be used to denote the total mobile phase in the column, moving and sialic. The term moving phase will be used for liial fraction of the mobile phase that actually moves, whereas the term static phase will be used for that fraction of the mobile phase that is trapped in the pores, or in the interstices of the support particles, and does not move. 

Interstitial Moving Phase Volume. From the Retention of Silica Smoke 1.41 ml Interstitial Static Phase Volume. By Difference 0.50ml... 

It is administered continuously with the feed at a dose of 200 ppm for rabbits and 125 ppm for chickens. A mixture with methylbenzoquate is also available for prevention of coccidiosis in chickens and turkeys. Clopidol is more coccidiostatic than coccidiocidal. Its coccidiostatic activity may hold tire sporozoite undeveloped in the host cell for as long as 60 days if the drug is withdrawn during this static phase, latent coccidiosis may appear as the parasite resumes development. For clopidol, a withdrawal period of 5 days has been set for all animal species. 

Existence of stripes looks just natural in terms of a static phase separation. At doping the system (LSCO) must screen the excess charge (Sr2+-ions) in AF regions. Therefore stripes of the AF ordered phase must alternate with "metallic domain walls. The stripe arrangement by itself is nothing but an optimization of the competing Coulomb and lattice forces [7]. (The phenomena is well known in physics of surface.)... 

A rather simple interpretation of the behaviour of vibrating electrodes can be obtained by considering the response to a square-wave motion, to which a sinusoid rather crudely approximates [33]. Here, it is considered that the concentration boundary layer is periodically renewed by the instantaneous rapid motion and that in the intervals between the square-wave steps the solution is at rest. This is a reasonable approximation for most practical purposes because the hydrodynamic boundary layer relaxation time is short, (Section 10.3.3). In this simple model, the waveform would instantaneously rise to a limit during the motion, decaying as a function of t m during the static phase. This decay rate will obviously be dependent on the size and geometry of the electrode wire, microwire, band or microband. If the delay time between steps were r then the mean current would vary as (l/r,)/o f 1/2df, i.e., as t, i/2 or as fm. 

In i960 three phases found in thyroid-related orbitopathy were described the initial dynamic phase, a static phase, and a final quiescent phase. The dynamic phase results in eyelid retraction and proptosis. The static phase shows little improvement. The quiescent phase can show some improvement in eyelid retraction and ocular motility. 

The methodology for wrapper development is illustrated in Fig. 5.62. It is subdivided into four construction phases (phase 1-4), which are followed by a generation phase (phase 5). In each construction phase specific models are defined, describing both static (phase 1 and. 3) as well as dynamic aspects (phase 2 and 4) of the wrapper. The models are either generated (semi-)automatically (phase 1 and 2) or specified manually (phase 3 and 4). 

The main idea behind chromatography is the separation of a mixture of two or more compounds by using two auxiliary phases one of which is the static phase and the other the mobile phase. The physical state of the static or stationary phase can be solid or liquid whereas the mobile phase can be liquid or gaseous. All chromatographic methods can be classified into four main classes based on the combination of the physical state of the mobile and static phases ... 

Mobile phase is liquid and static phase is solid. The main principle of the separation by this method is adsorption on the static phase. 

Other authors reported that, using three sequential static phases, ASE (here defined as RLE) removed an equivalent quantity of DDT and its metabolites as Soxhlet extraction in less time and with less solvent and that recovery was almost quantitative when the sample was appropriately worked-up and manipulated. Hubert and coworkers investigated the dependence of the extraction efficiency of POPs, including OCRs, on the ASE operating variables solvent and... 

In a detailed study of a 25 cm x 4.6 mm I.D. column packed with Zorbax C8 (5 p,m particles and a surface area 330 m /g) with methanol-water (1 4) as mobile phase it was shown that 33% of the column volume was occupied by the fixed stationary phase [690]. The pore volume (21 % of the column volume) consisted of 21% adsorbed solvent and 79% bulk solvent. The interparticle volume (46% of the column volume) consisted of 73% moving phase and 27% static phase. It is not easy, however, to determine the various column volume elements, and generally kinetic and thermodynamic parameters have been determined for inadequately defined phase ratios and may not be correct in the absolute sense. 

Static phase-equilibrium cells which operate at pressures over 100 MPa have been developed to study the phenomenon usually referred to as gas-gas immiscibility, Several of these are discussed in this section. A substantial proportion of the work on gas-gas immiscibility has been carried out in Russia, and the Russian work has been reviewed in detail in several books and reviews by Tsiklis. -i ... 

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