Tilt solution

Figure Bl.22.8. Sum-frequency generation (SFG) spectra in the C N stretching region from the air/aqueous acetonitrile interfaces of two solutions with different concentrations. The solid curve is the IR transmission spectrum of neat bulk CH CN, provided here for reference. The polar acetonitrile molecules adopt a specific orientation in the air/water interface with a tilt angle that changes with changing concentration, from 40° from the surface nonnal in dilute solutions (molar fractions less than 0.07) to 70° at higher concentrations. This change is manifested here by the shift in the C N stretching frequency seen by SFG [ ]. SFG is one of the very few teclnhques capable of probing liquid/gas, liquid/liquid, and even liquid/solid interfaces.

Closure at the instant of reversal of flow is most nearly attained in these valves. This timing of closure is not the whole solution to noise and shock at check valves. For example, if cessation of pressure at the inlet of a valve produces flashing of the decelerating stream downstream from the valve or if stoppage of flow is caused By a sudden closure of a valve some distance downstream from the check valve and the stoppage is followed by returning water hammer, slower closure may be necessary. For these applications, tilting-disk check valves are equipped with external dashpots. They are also available with low-cost insert Dodies. 

Tilting pipettes, which are attached to a reagent bottle, are only suitable for delivering approximate volumes of solution. 

At this point, two options are available if required. (1) If more complete degassing is desired, freeze the liquid contents by soaking the appropriate part of reaction vessel in dry ice/acetone bath, evacuate to 10 pm Hg, then thaw the contents, followed by an additional 10 min degassing. (2) If the removal of residual 1602 is desired, mix the two solutions by tilting the vessel to consume the 1602 by luciferin-luciferase luminescence reaction. The resulting reaction will cease in 2-3 min. Then, degas the content for 1-2 min to remove the C02 produced in the luminescence reaction. 

To a stirred solution of 110 mg (0.246 mmol) of benzyl (3S,5S,6/f)-3-bromo-2-oxo-5,6-diplienyl-4-morplio-linecarboxylate in 2 mL of dry tilt is added 150 tL (0.944 mmol) of trimcthyl(2-propenyl)silane followed by addition of 2.5 mL of a 0.187 M solution of zinc chloride in THF (0.472 mmol). After stirring for 60 h at 25 "C the mixture is poured into water and thoroughly extracted with CH,CL. The combined extracts... 

Keep the head tilted or lie on the untreated side for 2 to 3 minutes to allow the solution to remain in contact with the ear. Excess solution and solution running out of the ear can be wiped off with a tissue... 

Abstract We explain the laser guide star concept and why we do need laser guide stars (LGS) to greatly enhance adaptive optics performances at large telescopes. Then we discuss the two physical limitations of LGS, which are the cone effect and the indetermination of the tilt of the incoming wavefront. Solutions to overcome them are explained. 

A long path has been followed to overcome these two physical problems raised by the laser guide star, namely the cone effect and the tilt determination. And there is still a lot of work to be carried out before everything is solved. But I would say that the mathematics and the physics involved in the solutions we have today in hands are mastered, it is now clear that ... 

The pectin solutions were mixed at 70°C with hot CaCl2 or CuCl2 solutions for 3 minutes and then poured into sealed tubes. After standing at least 48 hours at the setting temperature, the tubes were tilted and phase diagrams were determined by visual inspection. 

Carefully pour the adipoyl chloride solution down the inside wall of the beaker containing the hexamethylenediamine. This can best be done by tilting the beaker containing the hexamethylenediamine and pouring the adipoyl chloride solution down the inclined side. If this is done carefully, two layers will form. 

The purified sulfuric acid (i.e., preheated the commercial ultrapure grade H2SO4 at 200°C for 24 hr under vacuo to remove its decarboxylating contaminants and subsequently cooled to ambient temperature), 0.5 ml, was added to the bottom well of the decarboxylation flask and subsequently placed under vacuo. A known amount of a GC-standard (640 mm of 100 ppm C2Hg in He) was introduced into the flask for the total CO2 determination. The acid was then allowed to dissolve the photodegraded residual film on the side of the flask by tilting. The acid solution was left standing for 20 minutes at room temperature. 

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