Aluminium plating

Figure 2. Schematic of the experimental arrangement used for inspection of aluminium plate. Lenses are shown as LI and L2, mirrors as Ml, M2 and M3, and liquid crystal cell as LC...

Figure 3. Sheared speckle image of a square aluminium plate clamped along all four sides...

Figure 4. (a) Correlation image of centrally loaded square aluminium plate clamped along all four sides, (b) Raw phase map shearogram. (c) Image enhanced phase map. 

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

B-scan view of a flat bottom hole in an aluminium plate of thickness 2 mm. 

Fig. 6. Test with one segment of 6 sector transducer in pulse-echo mode on aluminium plate, (a) no defect (b) defect simulated with mercury droplet (c) defect position.

Safranek, E. H., Schiekner, W. C. and Faust, C. L., Electroplating Aluminium Wave Guides Using Organo-Aluminium Plating Baths , J. Electrochem. Soc., 99, 53 (1952)... 

Method of Aluminium Plating with Diethylaluminium Hydride, Continental Oil Co., UK Pat. 1 178 954 (28.1.70)... 

The plate should be heated as rapidly and as evenly as possible after the first spraying step this is best done on a thick preheated aluminium plate in a drying cupboard equipped with ventilation allowing the nitric acid vapors to be removed using a water pump vacuum. Sodium dithionite is better than titanium(III) chloride or tin(II) chloride for the reduction of the nitro derivatives of amitrityline and nortriptyline. 

There is an American test for biscuit flour that involves producing standard cookies baked on a standard aluminium plate. The diameter of the finished product is measured. The greater the diameter the higher the score. This test is of course a measure of dough extensibility, which is the crucial property for biscuit flours. 

Figure 16. Flowcell reactor constructed from silica coated aluminium plates sealed with a viton spacer [35],...

Reaction of Aluminium with Oxygen and Water. (The experiment is prepared by one student who demonstrates it to the class.) Clean two aluminium plates from aluminium oxide with emery paper and next from grease by boiling them in a small amount of ethanol. Put the plates into a porcelain bowl in a tray with high sides and pour a few drops of a mercury(II) nitrate solution onto them. After five minutes, wash the plates with water, put one of them on a watch glass, and leave it in the air. Immerse the other one into a beaker with water. Observe what occurs and explain these phenomena. Write the equations of the reactions. 

The nitrator sketched in Fig. 143 is a cylindrical stoneware vessel of internal diameter 1.1m and depth 0.4 m, strengthened with an iron belt. Its conical bottom is fitted with an outlet pipe. A three-way valve is provided for evacuating and filling the vessel with acid. Inside the vessel there is a perforated stoneware plate to support the cotton charge. Twenty five to twenty nine centimeters above this plate supports carry a perforated aluminium plate 15 mm thick, which acts as a false... 

Fig. 143. Diagram of Thomsons nitrator /—perforated bottom plate of stoneware, 2—filtering stoneware plate, 3—perforated aluminium plate, 4—discharge pipe, according to Pascal [14].

When the cotton has been introduced, the aluminium plate is placed in a position such that the meniscus of acid lies halfway up the perforations (Fig. 144). 

Water is then led in carefully by means of a rubber pipe lying on the aluminium plate so as to form a hydraulic seal, i.e. the water in contact with the acid in the plate... 

After nitration is finished the apparatus is slowly emptied at the rate of about 150 1. of acid per hour. At the same time cold water supplied by a rubber pipe is allowed to flow at the same rate onto the surface of the aluminium plate so as to maintain the same level of liquid in the nitrator. During this operation acid is displaced by water that also mixes with the acid retained in the guncotton. The boundary between the two liquids falls in the vessel at a rate of 2.5 mm/min. 

Alpema. The standards of the brazed aluminium plate-fin heat exchanger. Houston Association Alpema, 1994. 

A modification of Traube s theory was introduced simultaneously in 1897 by Bach 3 and by Engler and Wild,4 who laid emphasis on Traube s idea that the oxygen molecule combines as a whole, but extended its powers of combination to other substances than nascent hydrogen. In support of this, it was pointed out that sodium will burn on an aluminium plate to the peroxide, Na202, whilst rubidium is almost quantitatively converted into the peroxide, Rb02, in a similar manner.5... 

Figure 10.8. Parallel plate cell the aluminium plates function both as the waveguide walls and as the Stark plates [2].

Homogeneous films can be prepared in a hot-press at 380°C under 130 bar and cooled to room temperature between aluminium plates. 

Fig. 3.9. Method used to study the diffuse reflectance of opaque samples in pulse radiolysis (Adams et al., 1991). The insert shows the method used to mount the sample. The electrons pass through the thin aluminium plate and the probe light through the quartz window. The scattered beam is analysed in the normal way with a monochromator, care being taken to exclude normal reflected light.

Chaudry and Bhide [57] demonstrated a process for cleaning metallic surfaces contaminated by a spent-fuel radioactive wastewater stream. Using an aluminum cathode and tapwater as the electrolyte, a current density of 15 pA/cm on a contaminated pipe wrench made of mild steel (rendered anodic) reduced the radioactivity from 26 pGy/h to 0.26-0.39 pGy/h in 15 min. Similar results were obtained when studies were performed on contaminated aluminium plates. 

Chlorotrityl chloride resin was obtained from CBL (Patras). Fmoc-amino acids and their derivatives were purchased either from Advanced Chemtech, Nova-Biochem, SNPE or Bachem (Switzerland). Solvents, AcOH, TFA and TFE were of analytical grade, purchased either from Merck or Fluka and used without further purification. TLC was performed on a precoated silica gel 60 F254 (Merck) aluminium plates employing the following solvent systems chloro-form/methanol/acetic acid (90 12 2) and (85 10 5), toluene/methanol/acetic acid (70 30 15) and (90 10 10). All HPLC runs were performed on a Merck Hitachi... 

Take the mixture out of the bowl, spread it on an aluminium plate and leave it to cool naturally. 

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