Shielding suppressive

Chen, Y.F., et al. 1990. Cyclosporine-containing collagen shields suppress corneal allograft rejection. Am J Ophthalmol 109 132. 

B. W. Je2ek, "Suppressive Shielding for Ha2ardous Munitions Production Operations" in Symposium on Processing Propellants, Explosives, and Ingredients, American Defense Preparedness Association (ADPA), Washington, D.C., 1977. 

Suppressive Shield Structural Design and Analysis Handbook, U.S. /Army Corps of Engineers, Huntsville, Div. No. HNDM-1110-1-2, 1977. 

King, An Overview of the Suppressive Shielding Program , Minutes of the 16th Explosives Safety Seminar, Vol 1, DOD Explosives Safety Board (Sept 1974), 91 — 139 9) I. Forsten,... 

Thresher, Applications of Suppressive Shielding in Hazardous Operation Protection , EM-TM-76-003 (June 1975)... 

Casey, Facility Design Reviews Program for Munitions Production Base Modernization and Expansion, Status Report , PATM 2178 (1975) 33) B.W. Jezek et al, Applications of Suppressive Shielding in Hazardous Operation Protection , Rept No EM-TR-76008, Edgewood Arsenal, APG (1975) 34) W.F. Nekevis et... 

It was concluded from this and related works that suppression of the photodissolution of n-CdX anodes in aqueous systems by ions results primarily from specific adsorption of X at the electrode surface and concomitant shielding of the lattice ions from the solvent molecules, rather than from rapid annihilation of photogenerated holes. The prominent role of adsorbed species could be illustrated, by invoking thermodynamics, in the dramatic shift in CdX dissolution potentials for electrolytes containing sulfide ions. The standard potentials of the relevant reactions for CdS and CdSe, as well as of the sulfide oxidation, are compared as follows (vs. SCE) [68] ... 

Both types of insulation act to suppress thermal radiation by the intermediate shield principle. The insulation also acts to reduce the effective cell size for any residual gas in the vacuum space, thereby suppressing the thermal conductivity of the gas. In a typical commercial superinsulated dewar, there are about 50 layers of superinsulation, corresponding to a thickness of about one inch. The first few layers are the most effective in the attenuation of thermal radiation however the subsequent layers are important for the suppression of thermal conductivity of any residual gas. One can define an effective thermal conductivity for these insulations, which in the case of superinsulation is about 10 6 W/(cmK) between 300 and 4K. 

Ambient radioactivity originating from the surroundings is suppressed as much as possible by multiple passive shielding layers. 

Newt, Notophthalmus viridescens adults, single acute exposure of 20 Gy, one limb shielded or 22 Gy, whole body, no limbs shielded Frog, Rana sp., single acute exposure Forelimb regeneration completely suppressed when limbs to be amputated were irradiated directly. Irradiated limbs had severe and protracted inflammation, with total resorption of the affected limbs in 85% of the cases. Shielded limbs subsequently amputated had delays — but not suppression — in rate of forelimb regeneration and skin graft rejection 4... 

Most gas pressure parameters for vented HE explosions apply for open vents and the special venting configurations developed for suppressive shields (Refs. 17 and 19). If vents are covered with blowout or frangible covers, the peak gas pressures are essentially the same as in unvented structures, but venting times and gas impulses can be altered (increased), depending on the vent area, mass per unit... 

Typical sections through vent panels evaluated in the suppressive shields program are shown in Fig. 36, together with definitions of vent area ratios which were found to correlate with attenuation of transmitted blast waves. 

Procedures for calculating vent area ratios for various structural configurations which have been used for suppressive shields are presented in Fig. 36. The procedures shown in Fig. 36 are believed to be self-explanatory, except possibly for the interlocked I-beams. The vent areas number 2 and 3 for this case are to take account of the two equal spaces b associated with each I-beam. 

The expression for peak overpressure in psi outside a suppressive shield is (Ref. 38)... 

Optical detectors shall be used in more open configurations where ressure buildup due to the incipient explosion is limited. Optical etectors shall not be used where high dust concentrations limit the reliability of the suppression system. Both uv and ir detectors are available for optical detection. The use of daylight-sensitive sensors shall be avoided to avoid spurious activation. The sensor shall be mounted such that the angle of vision allows it to cover all the protected hazard area. The performance of an optical detector will also be affected by any obstacles within its vision, and this shall be overcome by the introduction of more detectors. Optical detectors shall be fitted with air shields to keep the optical lens clean. 

---