C*Ascend

C — Ascending condenser, syst Vigreux (40— 45cm long) connected in series with D — Descending condenser of the same syst and length, which joins at its bottom to a tube provided with tbree-way stopcock R3, which can be communicated either with ... 

C Ascend-, (a-D-glucosido)-a-D-glucoside mycose natural trehalose a,a-trehalose trehalose dihydrate. 

Piela, P. C., ASCEND An object-oriented computer environment for modeling and analysis. Ph.D. Thesis, Carnegie-Mellon University, Pittsburgh, PA (1989). 

Note. In the older types of Soxhiet extractor, an external tube ran from B up to the top of C for conveying the ascending column of hot vapour. This type had the disadvantage not only of being more easily broken, but also that the condensed liquid in C received very little heat, and therefore the extraction, being carried out by the lukewarm solvent, was usually very slow. 

Fig. 3.35 Mercury porosimetry intrusion-extrusion plots of alumina gels prepared from solutions of aluminium monohydrate in A, propan-2-ol (2-5w/v%) B, propan-2-ol (4-9w/v%) C, 2-methylpropan-2-ol (4-9 w/v%) D, 2-methylpropan-2-ol (9-5 w/v%) E,butan-2-ol (9-5 w/v%). -------, ascending, intrusion curve -----, descending, extrusion curve.

The furnace (Fig. 2) maybe divided into four zones (from bottom to top). (/) Hearth and raceway as the coke descends through the furnace, it is heated by the ascending gases to about 1370°C. When it reaches the raceway in front of the tuyeres, it reacts immediately with the oxygen in the hot blast air. Equation 1, however, is actually the combination of coke combustion (eq. 6) and coke gasification (eq. 7, also referred to as solution loss). 

Thermal Properties. Because all limestone is converted to an oxide before fusion or melting occurs, the only melting point appHcable is that of quicklime. These values are 2570°C for CaO and 2800°C for MgO. Boiling point values for CaO are 2850°C and for MgO 3600°C. The mean specific heats for limestones and limes gradually ascend as temperatures increase from 0 to 1000°C. The ranges are as follows high calcium limestone, 0.19—0.26 dolomitic quicklime, 0.19—0.294 dolomitic limestone, 0.206—0.264 magnesium oxide, 0.199—0.303 and calcium oxide, 0.175—0.286. 

Fig. 17-5. Cooling of ascending air. Dry air forced to rise 200 m over a ridge cools adiabati-cally by 2°C.

Ascending, one-dimensional development at 10 —12 °C in a twin-trough chamber with 5 ml cone, ammonia solution in the trough containing no mobile phase (chamber saturation 15 min). 

Ascending, one-dimensional multiple development method (stepwise technique, drying between each run) in two mobile phase systems in a twin-trough chamber without chamber saturation (equilibration 30 min at 20-22°C) at a relative humidity of 60 — 70%. 

Ascending, one-dimensional double development in a trough chamber at 80 °C without chamber saturation. 

Ascending, one-dimensional development at 10 —12°C in a twin-trough chamber, with 25% ammonia in that part not containing mobile phase. The chamber was equihbrated for 15 min before starting development. 

Ascending, one-dimensional development in a twin-trough chamber (Camag) with 5 ml ammonia solution (25%) in the trough free from mobile phase. Chamber saturation ca. 15 min development at 10—12°C. 

Notes. In the case of a single oxide (or hydroxide) existing in different allotropic states, indicated by the letters a, b, c, d, etc. the oxides are arranged in descending order of stability, i.e. in ascending order of standard chemical potentials (expressed for an identical chemical formula). 

Procedure. Pour the developing solvent into the chromatographic tank to a depth of about 0.5 cm and replace the lid. Take a prepared plate and carefully spot 5 pL of each indicator on the origin line (see Section 8.6, under Sample application) using a micropipette. Allow to dry, slide the plate into the tank and develop the chromatogram by the ascending solvent for about 1 h. Remove the plate, mark the solvent front and dry the plate in an oven at 60 °C for about 15 min. Evaluate the R value for each of the indicators using the equation... 

Ascending, one-dimensional step development in a trough chamber with 5 min drying in cold air betweeen the two development steps (1st development at room temperature without and 2nd development at -20°C with chamber saturation). 

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