Double tipping

A variation on this type of filter is the double tipping pan filter, which is a semicontinuous type consisting of two rectangular pans fitted with a filter cloth and pivoted about a horizontal axis. Slurry is first fed onto one pan, which is turned over for cake discharge at the end of the cycle. The second pan is used for filtration while the first is being discharged. 

A direct descendant of these matches is the nontoxic modem double-tipped strike-anywhere (SAW), the large "kitchen" match version, or the smaller "peimy box" variety. It is based on the invention of two Frenchmen, Henri SAvnne and Fmile David Cahen, who used the nonpoisonous compound tetraphosphoms trisulfide, P4S3, as a phosphoms substitute and acquired a U.S. patent in 1898. 

Use of a Bent Blowpipe and Double Tipping Device For getting at tubes placed awkwardly in complicated apparatus a bent tubular blowpipe is very convenient. A useful design is shown in Figure 83,1. 

The terrace heights are 1.2nm (D) which means that the microscope has a vertical resolution of at least 1.2nm. It is noteworthy that two artifacts towards the top of the AFM image are observed which are absent in the HRSEM image a doubling of surface debris. This artifact is produced by the AFM possessing a double-tip separated by a distance equal to the distance between the two features [12],... 

Double-stranded RNA (dsRNA) in yeast, 26 451—452 Double-stranded RNA viruses, 3 135 Double-suction pumps, 21 60, 63 Double tipping pan vacuum filter, 11 352 Double titration method, 15 145 Double vacuum-arc remelting (VAR), in titanium sponge consolidation, 24 854 Double wall nanotubes (DWNT), 26 737 Double-wall tanks, 24 296 Doubly smart block copolymers,... 

Re(CO)sBr,5 and 2.5 g (38 mmol) of zinc dust. The flask is then capped with a rubber serum stopper and evacuated. Into another Schlenk flask is placed 50 mL of 2,5,8,22,14-pentaoxapentadecane (tetraglyme, Aldrich) and 4 m L of 85% phopshoric acid. This flask is also capped with a serum stopper and the solution is degassed in vacuo for 2 h at room temperature. At this point the acid solution is transferred under nitrogen to the flask containing the solids via a double-tipped needle (cannula). The flask is wrapped with aluminum foil for protection from light, and the mixture is stirred under nitrogen until no solid Re(CO)sBr remains. This should take 24 h. 

The transfer cannula was a 12-inch, 16-gauge, double-tipped syringe needle, and the 250-mL flask was washed with an additional 30 mL of anhydrous benzene (Note 17), which was cannulated into the 1000-mL flask. 

The submitters used a 50% solution of l-buten-3-yne in xylene, available from Chemical Samples Company. For transferring this solution, the following procedure may be recommended. An ampule containing the solution is cooled with an ice-salt bath, opened, and capped with a rubber septum. A weighed measuring flask capped with a rubber septum is cooled with the ice-salt bath. To this is introduced the cooled solution by means of a double-tipped needle, and the weighed solution is then introduced to the reaction flask by means of a double-tipped needle. 

Dry the three-necked, round-bottomed flask with magnetic stirring bar and double-tipped needle overnight in an electric oven at 110°C. Allow to cool in a desiccator before use. 

By means of the double-tipped steel cannula add 100 mL of the p-anisyl-lithium solution to the suspension at room temperature. At the beginning of addition, the temperature rises to 40°C and a bright-yellow colour appears in the flask. This yellow colour disappears progressively and at the end of the addition (100 mL, 130 mmol p-anisyllithium) a dark-red solution is obtained. Stir under argon at room temperature for a further 48 h. 

Dissolve Cu CH3CN)4BF4 in 30 mL of previously degassed acetonitrile transferring the solvent by means of a double-tipped steel cannula. Stir until all the copper salt is dissolved. 

At room temperature transfer the Cu(CH3CN)4BF4 solution to the stirred degassed solution of macrocycle 8 via a double-tipped steel cannula. A deep-orange colouration appears in the solution. Continue stirring for 0.5 h at room temperature. 

Transfer the diphenol-DMF solution to the copper-macrocycle solution via a double-tipped steel cannula the solution turns dark-red immediately. 

Cool the reaction flask in an ice bath. Add dropwise, via a double-tipped steel cannula and under argon, 60 mL of the 4-lithiotoluene solution. Adjust the rate of addition in order to maintain the reaction temperature below 30°C. During the addition the colour of the mixture becomes first bright yellow, then dark red. 

Dissolve the porphyrin in 2 mL of dichloromethane (added via syringe). Transfer the resulting solution into the reaction mixture via a double-tipped... 

Another method of particle velocity measurement is the double tip optical fiber, which consists of two groups of optical fibers with a certain distance between each other, as shown in Fig. 6. When a solid particle passes the probe tip, two signals with a certain time interval in between would be detected. This time lag can be computed by means of the cross-correlation function (Qin and Liu, 1982) ... 

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