String Ribbon

String ribbon technology, 23 41 Strip copper, 7 693, 724 Stripped bass... 

This will be demonstrated for three typical examples representing the most important silicon ribbon growth processes the edge-defined film-fed growth and the string ribbon process where the crystallisation interface moves in line with the ribbon transport direction as typical representatives of type I, and the ribbon growth on substrate technique where the liquid-solid interface moves almost perpendicular to the ribbon transport direction as type II process. 

Fig. 7.3. Schematic drawing of the string ribbon (SR) process. Two strings are pulled through the silicon melt. They define the edges of the silicon film. Currently two strings are pulled in parallel ( Gemini technique), with a new geometry of four strings in line coming into production (so called Quad process)...

Similar to EFG, an afterheater construction around the crystallisation area is used to reduce thermal stress [29]. As for EFG material, the string ribbon technology uses a small silicon melt crucible in combination with continuous melt replenishment. To overcome the limited throughput of only one ribbon per furnace, compared to 8 or 12 ribbons for EFG, two ribbons [33] and even four with new crucible design [34] can be grown simultaneously in one furnace. The ribbon is cut into 8 x 15 cm2 wafers. 

When peptides containing four cysteine residues in the molecule are randomly oxidized, three different disulfide isomers can be formed (Scheme 1), isomer 1 with the disulfides aligned in parallel manner, isomer 2 with crossed disulfides and isomer 3 with sequential disulfides these isomers are also named in a more descriptive manner as the ribbon, globule and string-of-beads isomers. 28 The preferred formation of one of the isomers strongly depends upon the sequential topology of the cysteine residues, but also upon the sequence composition that may favor more or less globular structures with hydrophobic cores. 

When you have decided what type of cell to use for your project, you can move on to purchasing the tab and bus ribbon that will connect the cells and strings of cells. Tab and bus ribbon are made from soft copper that is pressed into a flat wire. This ribbon is tin coated to make it easier to solder. Most tab and bus wire used for BSPMs is. 003",. 004", and. 005" thick. 

The particular cells that I had were 5" in width and height. I laid out the cells on the fiberboard to see how many I could fit in the 26" X 28" space with enough space left for tab and bus ribbon connects as well as enough space to stay comfortably away from the metal edges. With these cells I could just fit twenty cells (4 strings of 5 cells each) with sufficient space for tab and bus ribbon connects, and power take off leads. 

After all of the cells needed are tabbed, connect them into strings, according to your design. My panels called for four strings of five cells each. Position the tabbed cells within the cell outlines drawn on the fiberboard, and tape each cell by the tab ribbon to the fiberboard so that the cells will not move. Do not put tape over the surface of the cells as this can leave a gummy residue, and when you take the tape off, it can crack the cell. 

With the strings laid out in the final positions they will occupy in the panel, connect the strings with bus ribbon. For my panel, I cut 18 short pieces of bus ribbon the length needed to connect the string buses that lie next to each other (see illustration at right). Tin /le" on each end of the short pieces of bus ribbon. 

Peel/slide the cells into the frame. Use the fiberboard guide to gently slide the cells onto the frame, carefully aligning the cells to their final placement. Dab silicone along and under the bus ribbon of the connected strings (see photo, next page) Do this well, as this silicone is... 

FIGURE 27.4 Representation of the ricin protein derived from X-ray crystallographic data. The A-chain and B-chain are blue and orange, respectively. Random coil regions are strings, (i-sheets are flat ribbons, and a-helices are coiled ribbons. 

Figure 2 The WWW 3DB Browser in action. " On the left is the browse screen, with windows to enter search strings. In the upper right, the selected entries, i.e., acetylcholinesterase (1ACJ) is displayed as a ribbon diagram with RasMol. On the lower right, the text of the lACJ entry is shown with the blue text indicating a HyperLink to other databases, including the SwissProt protein sequence database ...

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