Using Conditional Watch

A conditional watch expression causes VBA to enter break mode only when a variable changes in value or when an expression evaluates to True. 

Watch expression (current value is displayed in the Watches pane when VBA enters break mode) 

Conditional break expression (break occurs when expression is True) 

Excel Tip. You can adjust the widths of the Expression, Value and Context columns in the Watches pane by placing the mouse pointer on the separator bar 

Excel Tip. You can adjust the widths of the Expression, Value and Context columns in the Watches pane by placing the mouse pointer on the separator bar to the left of the Value or Context header the pointer will change to the pointer shape, and you can drag the separator bar to adjust the column width. 

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For the NB mode, intensity minima of the transmitted luminance are calculated for dAn=0.48 pm, 1,09 pm and 1.68 pm which correspond to the minima of the Gooch and Tarry transmitted intensity for a wavelength A=0.55 pm. Operation in the 1 st minimum is mostly used in TFT displays as it offers a wider viewing angle [15, 16]. The 2nd minimum condition is used in watches and calculators. 

The strippable films deposited from solvents in the cold are much thinner (= 0.05-0.25 mm) than those from the hot-dip materials, and their protective properties are not nearly so good. A possible difficulty which must be watched for is the development of brittleness on ageing and consequent difficulty of stripping. Latex films containing inhibitors such as sodium benzoate have been found to deteriorate under tropical conditions, but may have a use in more temperate climates. 

One method we might use is to cool the melt to incipient nuclei-formatlon. toss in the seed-crystal, and allow the melt to freeze into a single crystal. This is the KYROPOULOS method which we will discuss in detail later. Alas, this method only works for a few systems, notably alkali halides (cubic) and the like. We find that we can use a seed-crystal to grow single crystals, but only if we use it under carefully defined conditions. A modified K5rropoulos method has been used for many years to form single-crystal sapphire up to 13.0 inches in dieimeter. Plates cut from such crystals are used as windows and substrates for all sorts of integrated circuits, as well as watch "crystals". 

Control of exudation depends mainly on the suitable choice of the nitrocellulose used. Some lack of uniformity in this product is certainly desirable. This offers no serious difficulty, although it is necessary to ensure a constant watch on manufacturing processes to see that quality is maintained. In other gelatine explosives, particularly those containing ammonium nitrate, exudation can be induced by slow chemical reaction. The addition of alkalis, for example, can liberate ammonia which in turn can react with nitrocellulose and cause it to lose its power of binding nitroglycerine. Such effects are accelerated at high temperatures and under wet conditions and it is usual practice to test all explosives under such adverse conditions before they are put on the market. 

Traditionally the most popular of the phosphorescent pigments are based on activated zinc sulfide, especially by copper, which glow green. These find their outlets in clock, watch and instrument dials, which are required to be visible in temporary, poor lighting conditions. They are also widely used in novelty items such as plastic toys and in sporting goods, for example as fish floats. Some typical commercial materials are shown in Table 3.2. ... 

Adjusting the nebulizer. Measure the sample uptake rate using a 10 ml measuring cylinder and stop-watch. Report the result in ml min-i Compare this with your previous reading. Note that the sample uptake rate and flame conditions are interdependent and that adjusting one will require re-optimization of the other. Therefore, do not adjust the sample uptake rate once the fuel/air ratio has been optimized. 

The containers must first be unscrambled. Watch out for induced dirt from friction, fracture of fragile containers, and static electricity from dry conditions and movement of plastics, which can attract small dust particles from the surrounding air. Most containers used for sterile filling (ampules, vials, bottles, and collapsible tubes) will be brought to the fdling line in precleaned and sterilized trays, so unscrambling might not be necessary. There are also certain types of outer cleaned bottles that are supplied in clean layers, with the outer plastic protection removed online. 

Watch out for fittings not intended to be used in pressure conditions. 

Working in a good fume hood, suspend the peptide-resin in anhyd iPrOH (20 mL g ) in a heavy-wall pressure vessel. For small runs, a round-bottomed flask can be used if it is in perfect condition, free from nicks and scratches. ChiU the suspension to — 20°C in an ice/ CaCl2 bath and saturate with anhyd NHj from a cylinder, using a KOH trap on the exit tube to prevent entry of moisture. Use a safety trap between the cylinder and the flask and watch constantly to be sure that solvent is not sucked back into the cylinder. Wire a tight rubber... 

Slow solvent evaporation is a valuable method for producing crystals of high quality it is used primarily for small molecules. The rate of growth is manipulated by adjusting conditions (initial concentration, temperature, evaporation rate) so that crystals are obtained in a few days, not months or minutes. The rate of evaporation can be adjusted by covering the solution with a watch glass or a piece of film (aluminum or Parafilm ) with a number of small holes punched in it. The solution is then left to stand undisturbed. 

Test Conditions 3.5 mil film cured at 0.6 sec. per linear inch of travel using 5,000 watt Addalux lamp (400 watts/linear inch) at 3" above work surface. Tests were done under watch glass where applicable. Substrate was particle board. 

In the preparation of dyes it is often necessary to heat the reaction mixture 3-10 hours at a particular temperature, which may vary from 110° to 180°. The usual procedure of using oil baths is highly unsatisfactory. Whether the mixture to be heated is 5 or 100 g, an oil bath cannot be heated by a flame and adjusted to keep a constant temperature even within a range of 10°. The pressure of the gas in the main varies from hour to hour a small flame is easily extinguished by drafts these conditions, and the time required to watch the process, are difficulties which call for some other arrangement. The semimicro constant-temperature bath which is described has been used with satisfactory results for a number of years. 

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