Sweep type

This dialog box is set up to sweep the voltage source named Vi from -15 V to +15 V in 0.01 V increments. The sweep type is linear, which means that the voltage points are equally spaced. Click the OK button to accept the settings ... 

The sweep type is changed to sweep a Global parameter. 

Notice that a Current source is set as the Sweep variable, and the Sweep type is set to Linear. 

The kind of voltammetry described in Sect. 4.2. is of the single-sweep type, ie., only one current-potential sweep is recorded, normally at a fairly low scan rate (0.1-0.5 V/min), or by taking points manually. Cyclic voltammetry is a very useful extension of the voltammetric technique. In this method, the potential is varied in a cyclic fashion, in most cases by a linear increase in electrode potential with time in either direction, followed by a reversal of the scan direction and a linear decrease of potential with time at the same scan rate (triangular wave voltammetry). The resulting current-voltage curve is recorded on an XY-recorder,... 

B. Methyl cyclopropyl ketone. A 2-1. three-necked flask is fitted with a sweep-type stirrer made from K-in. iron rod (Note 6), a reflux condenser, and a 500-ml. dropping funnel. In the flask there is placed a solution consisting of 180 g. (4.5 moles) of sodium hydroxide pellets and 180 ml. of water. To this solution there is added over a period of 15-20 minutes 361.5 g. (342 ml., approximately 3 moles) of the crude 5-chloro-2-pentanone (Note 7). If the reaction mixture does not begin to boil during the addition, boiling is initiated by slight heating of the flask and is continued for 1 hour. Three hundred and seventy milliliters of water is then added slowly to the reaction mixture over a 20-minute period, and the mixture is heated under reflux for an additional hour. 

Other considerations There is no single, universal flux but the general flux referred to as white flux can prove very useful. The composition is equal parts (by weight) of borax, sodivun carbonate, potassium carbonate, and sodivun chloride. This can be mixed and kept in bulk. Samples of 1-10 g are blended with 55g of litharge and 5g of fluor and lOOg of the white flux is added. This suffices for many materials of the sweep-type especially, and the addition of silica is unnecessary as corrosion of the crucible supplies all that is required to the fusion. 

---