Static casting

In low-pressure casting, static or dynamic mixers are employed and the pumping systems are set up to compensate for polymerization shrinkage by packing the mold with additional material. Thus, a solid part can be produced. 

Rotary Swivel Pressure Testing The assembled pilot model of rotary swivels shall be statically pressure tested. All cast members in the rotary swivel hydraulic circuit shall be pressure tested in production. This test pressure shall be shown on the cast member. 

The literature contains a number of studies on the susceptibility of the cobalt-based alloys to pitting corrosion. In-vitro studies conducted by Mueller and Greener , involving static conditions, revealed no evidence of pitting having occurred. Syrett and Wing ", utilising cyclic polarisation analyses, observed that neither as-cast nor annealed Co-Cr-Mo alloy demonstrated hysteresis loops in their cyclic polarisation curves. They... 

Even at their best, the models are able to predict only macroscopic properties of the films, yielding no information on microscopic parameters that may affect resist performance. It is highly probable that spin casting induces some structure or preferential chain orientation into the films, or causes secondary effects such as the aggregation observed by Law. These effects are barely addressed in the currently available literature. However, some earlier works (3.17-191 on solvent (static) cast films have investigated the molecular orientation of polymer chains as well as chain relaxation due to thermal annealing. 

Cobalt(II) chloride was dissolved in poly(amide acid)/ N,N-dimethylacetamide solutions. Solvent cast films were prepared and subsequently dried and cured in static air, forced air or inert gas ovens with controlled humidity. The resulting structures contain a near surface gradient of cobalt oxide and also residual cobalt(II) chloride dispersed throughout the bul)c of the film. Two properties of these films, surface resistivity and bullc thermal stability, are substantially reduced compared with the nonmodified condensation polyimide films. In an attempt to recover the high thermal stability characteristic of polyimide films but retain the decreased surface resistivity solvent extraction of the thermally imidized films has been pursued. 

The piezoelectricity of polymer films and its inverse effect, strain induced by applied voltage, have been observed for as-cast films, oriented films, and films which has been polarized under a static field. It is at present believed that all kinds of polymer films exhibit more or less piezoelectricity. 

A more serious threat to the materials compatibility of CNG fuel systems is condensed water vapor. Water can cause steel and cast iron to rust and aluminum to corrode. Any corrosion of components that must withstand high pressures is a concern, since corrosion stress cracking can occur which can result in failure of the component with disastrous results. The presence of water greatly accelerates the corrosion properties of the hydrogen sulfide that might be found in the natural gas. For these reasons it has been recommended that the way to control corrosion in CNG systems is to remove sufficient water vapor to prevent it from condensing in the system under static conditions [3.13]. Natural gas dryers have been developed to help reach this goal. 

Four batches of the same sort of composite rocket propellant have been cast in a lab. After curing, the experimental rocket motors were static fired at normal temperature. The following burning-rate values at P=70bar pressure have been obtained 14.199 14.531 14.197 14.193. Does the burning-rate value V=14.531mm/s represent the outlier with 95% confidence level ... 

A few strands of Miss Muxdroozol s hair stand at right angles to her body perhaps there is static electricity in the air. She raises her hands as if she is conducting an invisible orchestra, but to Bob it begins to look more like she is casting a spell or stirring a witch s potion. 

Some of these polymers are thermally stable, some have high molecular weight (150000), some are soluble in organic solvents, some are fusible, some can be cast into films. These polymers have been suggested as viscosity stabilizers for oil, grease thickners, anti-static agents, and corrosion resistant coating for metals. 

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