Segmented plate

Built-Up Mica. When the primary property needed for a particular appHcation is insulation, budt-up mica made by binding layered mica spHttings together serves as a substitute for the more expensive sheet mica. The principal uses for built-up mica are segment plate, molding plate, flexible plate, heater plate, and tape (7). 

Segment plate, used as insulation between copper commutator segments on direct-current universal motors and generators, accounts for the primary use for built-up mica. Phlogopite built-up mica is preferred for these segments because it wears at the same rate as the copper segments. 

The handling of sticky materials can present difficulties, and one type of dryer which is useful for this type of material is the turbo-dryer. As shown in Figure 16.30, wet solid is fed in a thin layer to the top member of a series of annular shelves each made of a number of segmental plates with slots between them. These shelves rotate and, by means of suitably placed arms, the material is pushed through a slot on to a shelf below. After repeated movements, the solid leaves at the bottom of the dryer. The shelves are heated by a row of steam pipes, and in the centre there are three or more fans which suck the hot air over the material and remove it at the top. 

Two combinatorial studies also utilized thermocouple arrays to measure temperature distribution. Yan et al.133 used an electrically segmented plate with three thermocouples to investigate the effects of a dynamic load on current and temperature distribution. The results are described further in Section 3.2. Maranzana et al.134 developed a transparent cell with 20 thermocouples and 20 electrically isolated segments of gold wire to monitor performance... 

Current distribution studies have also been used to develop optimal loading gradients for compounds within a PEM fuel cell. Santis et al.174 utilized a segmented plate design with Hall-effect sensors... 

Fig. 1. Preparatory manipulations for a graft or rotation of a portion of segmental plate (presomitic mesoderm). A Materials. B Remove the albumen. C Score a 1-cm window in the shell. D and E Remove the shell membrane. F Fill with CMF saline. G and H Inject Indian ink. I Grease the window. J and K Make a bubble chamber with trypsin solution. L Shine fiberoptics light tangentially onto the window.

Here the host emhryo is operated in ovo, which is suitahle with ease only for embryos older than about 36 8 h incubation. As an example, the operation described here consists of a graft of presomitic mesoderm (segmental plate) with a quail embryo as the donor and a chick embryo as the host. An identical procedure can be followed to transplant paraxial mesoderm that has already formed somites, but it should be remembered that this is much easier when it... 

Break the vitelline membrane over the region to be operated on using several nicks of the tip of a fine hypodermic needle (Fig. 2B-D). The segmental plates are the rodlike structures lying on either side of the neural tube at the tail end of the embryo, just behind the last somite. The portion to be rotated in this example is the most anterior third of the plate. 

Operating in the drop of trypsin, use the microknife to make initially very shallow cuts in the ectoderm next to the neural tube in the region of the operation (Fig. 2E). Repeat the same just lateral to the segmental plate (Fig. 2F). 

Remove the piece of segmental plate with a Gilson micropipet set to l-2pL. Replace the bubble over the embryo with fresh CMF twice to remove the trypsin solution. Make a new bubble of CMF while obtaining the graft from the donor. 

Cut out an equivalent piece of segmental plate as the one removed from the host, using the same technique. 

Use the knife and work at low magnification to manipulate the graft into the gap made by removal of the host piece of segmental plate (F. 2J and 2K). 

Fig. 1. A and D Ectopic transplantation of notochord (ect Not med asterisks) medially between neural tube and paraxial mesoderm A dorsal view, anterior to the top D cross section, dorsal to the top the axial level of the section is indicated in A. The operation has been performed at the level of the anterior segmental plate after 24h reincubation, the embryo was stained for the expression of the sclerotome marker Paxl (gray), the myotome marker MyoD (black), and the notochord—floor plate marker Shh (black). Note the ectopic notochord induced ectopic expression of Paxl and MyoD (arrowheads).

B and E Ablation of the notochord (-Not) at the level of the anterior segmental plate, by removing neural tube plus notochord and back-grafting the neural tube alone (details in (9)) reincubation time and views as in A and D. Note that the dermomyotomal marker Pax3 (gray) and the myotomal marker MyoD (black) are correctly expressed due to the remaining expression of Shh in the floor plate of the neural tube (black, Fp). 

Parallel plate rheometer Edge fracture Apparent gap error Viscous heating Cone-and-plate rheometer Apparent gap error Viscous heating Cone angle Cone-segmented plate... 

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