Recoil mechanisms

Photochemistry. Vinyl chloride is subject to photodissociation. Photexcitation at 193 nm results in the elimination of HCl molecules and Cl atoms in an approximately 1.1 1 ratio (69). Both vinyUdene ( B2) [2143-69-3] and acetylene have been observed as photolysis products (70), as have H2 molecules (71) and H atoms [12385-13-6] (72). HCl and vinyUdene appear to be formed via a concerted 1,1 elimination from excited vinyl chloride (70). An adiabatic recoil mechanism seems likely for Cl atom elimination (73). As expected from the relative stabiUties of the 1- and 2-chlorovinyl radicals [50663-45-1 and 57095-76-8], H atoms are preferentially produced by detachment from the P carbon (72). Finally, a migration mechanism appears to play a significant role in H2 elimination (71). 

To complete the explanation of why GP effects cancel in the ICS, we need to explain why the 2-TS paths scatter into negative deflection angles. (It is well known that the 1-TS paths scatter into positive deflection angles via a direct recoil mechanism [55, 56].) We can explain this by following classical trajectories, which gives us the opportunity to illustrate a further useful consequence of the theory of Section II. 

Howitzer (How). See Ref 44, p B27-L, under CANNON and Ref 40a, p 89. In Ref 45f, pp 2-1 2-3 it is defined as a complete weapon conforming to the general cannon definition including the attached or closely related units necesssry for operation as intended (recoil mechanism, mount, sighting system, accessories, etc, but not ammunition), and designed for performance characterized by velocity, range, and trajectory curvature intermediate between those of a gun and a mortar... 

Gymnast cation. Process of artifically exercizing a recoil mechanism by mechanical means in order to prevent undue deterioration in storage. Machine for mechanical exercising is called gymnasticator. See also "Exercizer, Recoil Mechanism , in this Vol, p E349-L and in GlossaryOrdn (1959), 144-L... 

There have been many reports of the wandering of polonium from open sources, behavior at one time attributed to an aggregate recoil mechanism (84), but more recent observations with curie quantities indicate that contamination only spreads when volatile compounds, for instance polonium tetrachloride, are involved. 

Artillery Carriages Mounts Recoil Mechanisms Rocket Launchers Auxiliary Equipment and Parts. General specifications for these items are in MIL-A-13917A(Ord)... 

Brakes, Recoil. Mechanisms which control the recoil of weapons. The modern recoil brake is s hydraulic brake and consists of a piston which moves in a cylinder filled with oil. The recoil brake is attached to the weapon in either of two ways a) the cylinder is attached to the tube(gun barrel) and moves with it during recoil and counterrecoil, while the piston is fixed to the carriage b) the piston is attached to the tube and moves with it during recoil and counter recoil, while the cylinder is fixed to the carriage. In either case, when the tube recoils, there is relative motion betw the piston and the cylinder and the operation in both Cases is fundamentally the same... 

Piezoelectric gages may be used not only to measure the pressure developed in closed bomb or in weapons, but also to measure the blast pressure and pressure developed in recoil mechanisms (Ref 5)... 

Recoil lass Rifles, They are, as their name implies, nonrecoiling weapons. Therefore, recoil mechanisms or sliding surfaces are not provided and heavy trails, spades, or other force resisting or compensating mechanisms are not required. For this reason, they can be transported more easily than heavier artillery. Elimination of the... 

For concentrated emulsions and foams, Prin-cen [1983, 1985] proposed a stress-strain theory based on a two-dimensional cell model. Consider a steady state shearing of such a system. Initially, at small values of strain, the stress increases linearly as in elastic body. As the strain value increases, the stress reaches its yield value, then at stiU higher deformation, it catastrophically drops to the negative values. The reason for the latter behavior is the creation of unstable cell structure that provides the recoil mechanism. The predicted dependencies for modulus and the yield stress were expressed as ... 

Based on the existence of type-II p-tums within short resilin sequences (Table 1), similar p-stmctures have also been invoked in the dastic mechanism of resilin (although energetic differences may exist between the dastic recoil mechanisms of the two protdns based on their different physicochemical properties). Ldj et proposed a modd invoking nonre-... 

FI G U RE 6.18 Schematic of convection in liquid produced by the vapor recoil mechanism. The local evaporation rate increases at point P and decreases at point Q. 

A number of mathematical expressions have been proposed to calculate die swell in relation to some measurable rheological variable. Most of these expressions relate to the maximum swell or equilibrium swell (BJ, assuming fully developed laminar flow in long dies. One of the first simple expressions, relating die swell as an elastic recoil mechanism to the first normal stress difference - T22 and the shear stress X21, can be expressed as follows [3] ... 

The functional and developmental details of the two so very different elastic recoil mechanisms of the two types of capture silk micro-machines are interesting and deserve deeper studies. However, at present we do not even understand the interaction of form and function in the much more typical spider silk fibre such as a dragline filament. Recent studies indicate that the toughness of spider dragline silk may depend on the complex hierarchical structure of the fibre [11] which in turn depends on a complex... 

Consider the bimolecular reactions of Table 8.1. On the basis of the activation energies and any chemical knowledge at your disposal suggest which reactions might proceed (a) via complex formation (b) via a recoil mechanism. 

The separation procedure most suitable for californium isotopes generated in accelerators may not be the same as that used for californium produced in reactor targets. In some accelerator experiments the desired californium isotopes may be physically separated via recoil mechanisms, which simplifies the rapid separations required for short-lived isotopes. The need for nuclear or radioactive purity, as opposed to chemical purity, will also affect the particular separative processes to be used. A considerable amount of information on californium chemistry was determined using tracer levels of californium. The major purification schemes for californium at the tracer level involved ion-exchange techniques to separate californium from other transcurium elements. 

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