The Final Drive

By the end of January 1945 the Allies had regained the ground lost during the enemy s Ardennes offensive. In February the 12th Army Group prepared for attack along the Roer and Sauer Rivers, an attack whose impetus would carry to the Rhine. This latter obstacle, the last great defensive barrier for the enemy, was surmounted in March. After that, victory was but a matter of time. 

Much of the fighting of February and March Involved river crossings. The Roer, the Erft, the Sauer, the Moselle, the Rhine—these were the larger rivers which blocked the American forces in their drive to the east. The chemical mortar battalions, by both smoke and high explosive missions, provided valuable support in this series of important operations. 

One of the most spectacular smoke operations in Europe involving chemical mortar battalions was staged in the Third Army sector during the XII Corps attack across the Sauer and Our Rivers. This attack, which began on 7 February 1945, was supported by the 91st Chemical 

Mortar Battalion, commanded by Lt. Col. Roy W. Muth, Companies B and C fired for regiments of the 5th Division Company D supported the 417th Infantry, 76th Division, attached to the 5 th Division for the operation and the two platoons of Company A supported, respectively, the 905th and 314th Field Artillery Battalions of the 80th Division. 

Company B, in support of the loth Infantry, had less trouble getting to its attack position despite the traffic-clogged roads leading to the river. Four hours after receiving march orders on the morning of j February, the platoons of the unit traveled ten miles and set up their mortars in the town of Berdorf. Company C supported the nth Infantry also from positions near Berdorf. Anticipating heavy enemy artillery opposition, the unit placed its switchboard and fire direction centers near the mortars to reduce the expected difficulty in keeping wire communications intact. 

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Figure 1 shows a series of uses for anaerobic adhesives in the final drive of an automobile as examples of application areas (see also Automotive applications). 

Output stage The final driving circuit in a piece of electronic equipment. 

It is quite clear, first of all, that since emulsions present a large interfacial area, any reduction in interfacial tension must reduce the driving force toward coalescence and should promote stability. We have here, then, a simple thermodynamic basis for the role of emulsifying agents. Harkins [17] mentions, as an example, the case of the system paraffin oil-water. With pure liquids, the inter-facial tension was 41 dyn/cm, and this was reduced to 31 dyn/cm on making the aqueous phase 0.00 IM in oleic acid, under which conditions a reasonably stable emulsion could be formed. On neutralization by 0.001 M sodium hydroxide, the interfacial tension fell to 7.2 dyn/cm, and if also made O.OOIM in sodium chloride, it became less than 0.01 dyn/cm. With olive oil in place of the paraffin oil, the final interfacial tension was 0.002 dyn/cm. These last systems emulsified spontaneously—that is, on combining the oil and water phases, no agitation was needed for emulsification to occur. 

In the macroscopic heat-transfer term of equation 9, the first group in brackets represents the usual Dittus-Boelter equation for heat-transfer coefficients. The second bracket is the ratio of frictional pressure drop per unit length for two-phase flow to that for Hquid phase alone. The Prandd-number function is an empirical correction term. The final bracket is the ratio of the binary macroscopic heat-transfer coefficient to the heat-transfer coefficient that would be calculated for a pure fluid with properties identical to those of the fluid mixture. This term is built on the postulate that mass transfer does not affect the boiling mechanism itself but does affect the driving force. 

Other factors also impact the type of crystals formed upon cooling of hot soap. Water activity or moisture content contribute to the final crystal state as a result of the different phases containing different levels of hydration. Any additive that changes the water activity changes the crystallization pathway. For example, the addition of salt reduces the water activity of the mixture and pushes the equiUbrium state toward the lower moisture crystal stmcture. Additionally, the replacement of sodium with other counter cations influences the crystallization. For example, the replacement of sodium with potassium drives toward the formation of 5-phase. 

An interlock is a protec tive response initiated on the detection of a process hazard. The interlock system consists of the measurement devices, logic solvers, and final control elements that recognize the hazard and initiate an appropriate response. Most interlocks consist of one or more logic conditions that detect out-of-hmit process conditions and respond by driving the final control elements to the safe states. For example, one must specify that a valve fails open or fails closed. 

Thus, Og and cytochrome c oxidase are the final destination for the electrons derived from the oxidation of food materials. In concert with this process, cytochrome c oxidase also drives transport of protons across the inner mitochondrial membrane. These important functions are carried out by a transmembrane protein complex consisting of more than 10 subunits (Table 21.2). 

The final step in the /3-oxidation cycle is the cleavage of the /3-ketoacyI-CoA. This reaction, catalyzed by thiolase (also known as j8-ketothiolase), involves the attack of a cysteine thiolate from the enzyme on the /3-carbonyI carbon, followed by cleavage to give the etiolate of acetyl-CoA and an enzyme-thioester intermediate (Figure 24.17). Subsequent attack by the thiol group of a second CoA and departure of the cysteine thiolate yields a new (shorter) acyl-CoA. If the reaction in Figure 24.17 is read in reverse, it is easy to see that it is a Claisen condensation—an attack of the etiolate anion of acetyl-CoA on a thioester. Despite the formation of a second thioester, this reaction has a very favorable A).q, and it drives the three previous reactions of /3-oxidation. 

Since the final proton transfer is essential for a successful condensation, it is important to understand what factors drive the proton transfer. Examine the electrostatic potential map of the carbanion, and draw all of the resonance contributors that are needed to describe this ion. How does this ion differ from the others Which product, if either, would be expected from the following condensation Explain. 

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