Slot-filling method

FIGURE 6.8 The slot-filling method for determining the Lewis structure of hydrogen chloride (HCl). In this case, the s orbital on the H and a p orbital on the Cl are involved. 

FIGURE 6.10 The slot-filling method for determining the Lewis structure of ammonia (NH3). 

FIGURE 6.11 The slot-filling method for determining the Lewis structure of the organic compound ethylene (CgH ). (a) The four orbitals on each of the carbons hybridize such that all four have an open slot and all four electrons are unpaired, (b) Hydrogens then fill two of the open orbital slots while a double bond forms as shown so that the other open slots are also filled. 

The second impregnation option also employs an open resin-filled bath, but the reinforcement is not guided down into the bath rather, it horizontally enters and exits the bath through holes and/or slots in the resin container and thus maintains its horizontal travel. The major advantage of this method, which often is used in production of hollow composites, is that the reinforcement does not need to be bent, which otherwise may exclude the use, or at least wrinkle or rip, of vertically oriented fabrics, mats, and veils. This impregnation method also has the disadvantage of significant volatile emissions. 

Now let us turn back to the last decades of the 19th century. When Mendeleev developed the periodic system of elements it contained many empty slots corresponding to unknown elements between bismuth and uranium. These empty slots were rapidly filled after the discovery of radioactivity. Polonium, radium, radon, actinium, and finally protactinium took their places between uranium and thorium. Only eka-iodine and eka-cesium were late. This fact, however, did not particularly trouble scientists. These unknown elements had to be radioactive since there was not even a hint of doubt that radioactivity was the common feature of elements heavier than bismuth. Therefore, sooner or later radiometric methods would demonstrate the existence of elements 85 and 87. 

The first storage method involves the use of spacers and the limit of two fuel bundles per rack slot. The first of two postulated criticality scenarios assodated with the first stort e method involves a maintenance operator filing to rq>lace the spacer in the radc slot, the loading operator mistakenly loading three bundles into one slot and the supervisor filling to detea this error coupled with another bundle bring transferred over this slot and the twin hook hoist mechanism... 

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