Secondary design phase

MDX-RA , an immunotoxin conjugated to an antibody designed to prevent secondary cataracts, phase III clinical trials, enrollment stopped. Medarex, Annandale, NJ. 

CP or other protection systems should be incorporated, if necessary, in the design phase of the ship. CP system is a secondary defense against corrosion when holidays or cracks form in the coating. CP systems use either sacrificial zinc anodes or impressed-current systems to mitigate corrosion. Other corrosion prevention equipment and materials are inert gases to drive out corrosive gases. Corrosion inhibitors are also used. 

Exploratory creep tests were performed on tensile specimens of NT-154 silicon nitride at 1300 and 1370 C, These specimens were made from the same lot of the material, designated as CP-serles, used In the cyclic fatigue tests discussed In the last progress report, Creep strain was measured using the laser diffraction strain extensometer described elsewhere,2 Figure 7 shows the creep curves of specimens CP-28 and CP-10 tested at 1300 C under applied stress of 160 and 180 MPa, respectively. Both tests were shutdown Inadvertently due to equipment adjustments. The problems have been corrected since then. Therefore, the results of the tests do not represent the creep life of the specimens. However, there were sufficient data points to delineate the essential features of the creep behavior up to the steady-state phase which was clearly definable. Both curves showed a reversed Inflection at the transition between the primary and secondary creep phases, resulting In forming a bump In the otherwise smooth creep curves. 

Fach phase of these circuits is provided with an appropriate main CT, the secondary of which is connected to the primary of the summation CT. Summation is possible of many circuits through one summation CT alone per phase. The primary of summation CTs can be designed to accommodate up to ten power circuits easily. If more feeders are likely to be added it is possible to leave space for these on the same summation CT. 

To ensure proper sensing of the incoming current and its phase displacement by the relay it i.s es.senlial that the CTs ratio and their VA burden chosen for the required duty are close to the actual requirement as noted in Table I. S.8.. Sometimes this fact is overlooked and CTs with a much higher VA burden or ratio or both are chosen while the secondary circuit may not be adequately loaded. In this case the CTs may not accurately transform the primary parameters to the secondary and. in turn, the relay may not send accurate signals. Moreover, the relay itself may operate only at minimum 19c or more of its rated current (I or 5 A), depending upon its design and type (lEC 60051-1). 

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