resorbable porous aluminum-calcium-phosphorus oxide (alcap) ceramics. interim rept. reprint: resorbable porous aluminum-calcium-phosphorus oxide (alcap) ceramics

a porous aluminum-calcium-phosphorus oxide (alcap) ceramic has been developed for potential use in correcting bone defects. the material is at least partly resorbed and appears to have acceptable biocompatibility and toxicity characteristics for its intended applications. alcap ceramics are fabricated by calcining mixtures of aluminum, ca..

non-destructive evaluation of infiltration-toughened ceramics

a set of zirconia pellets was subjected to surface toughening by the inclusion of alumina particles into the zirconia matrix before firing. the alumina particles were formed in the matrix by an infiltration process. non-destructive tests were carried out to measure the density profile, the alumina distribution and the residual strains in ..

is there anything of practical value hidden amongst the composite toughening theories.: a jim mueller prospective

numerous theories have been developed over the last three decades for explaining the toughening behavior of discontinuous fiber reinforced brittle matrix composites. the issue is the practical engineering utility of these theories. upon compiling a table of fiber parameters that are identified in the predominant toughening mechanisms, a n..

plastic deformation of highly doped silicon

heavily boron doped membranes are shown to be under tensile intrinsic stress with a negative intrinsic bending moment. however, the use of an oxide etch mask during membrane fabrication can alter the state of stress to an apparent compressive state with a positive bending moment. we propose that plastic deformation of the p+ silicon benea..

bulletin of industrial products research institute, no. 112, october 1988

contents: waste treatment of electroplating solutions for recovery and reuse of dissolved substances; studies on the molding of chitin and chitosan and the gelation of chitosan by n-acetylation

technological research and development system in important areas (biochemical pulping technology for non-wood resources). report of research

the project plans to produce pulps from non-wood resources, such as kozo, manila hemp, with the use of organisms for the purpose of developing of non-pollution and energy saving technologies. applying the features of biochemical reactions (i.e., specific, mild and energy conservative), novel biopulping processes for non-woody fibers inclu..

reduction de frottement hydrodynamique parietal (reduction of hydrodynamic surface friction). final rept

in the study, the effectiveness of different hull-covering materials to reduce surface friction was evaluated and a new kind of material with suitable elastic and damping properties proposed. the authors built an original experimental set-up consisting of a submergeable measurement table with four compartments containing strain-measuremen..

figure and finish of grazing incidence mirrors

great improvement has been made in the past several years in the quality of optical components used in synchrotron radiation (sr) beamlines. most of this progress has been the result of vastly improved metrology techniques and instrumentation permitting rapid and accurate measurement of the surface finish and figure on grazing incidence o..

aspects of the crystallization and morphology of poly(phenylene sulfide). final rept.reprint: aspects of the crystallization and morphology of poly(phenylene sulfide)

a working model, embodying the preferential growth of lamellae parallel to the b-axis direction, and branching or interlamellar splaying hinged about the a-axis in the lamellae, is proposed for the precursor structures which have been observed to develop in the early stages of growth of pps spherulites in bulk polymer at crystallization t..

sequential oxidative and reductive bleaching in a multicomponent single liquor system. patent application

objects and advantages of the invention are achieved by: a first process of the present invention which comprises, contacting fibers with hydrogen peroxide under conditions which provide oxidative bleaching of the fibers to produce bleached fibers in contact with unspent hydrogen peroxide; adding to the bleached fibers in contact with uns..