fracture toughness testing of polymer matrix composites

a review of the interlaminar fracture indicates that a standard specimen geometry is needed to obtain consistent fracture toughness measurements in polymer matrix composites. in general, the variability of measured toughness values increases as the toughness of the material increases. this variability could be caused by incorrect sizing o..

whispering-gallery mirrors for short-wavelength laser cavities: shapes and tolerances

the whispering-gallery mirrors desired for use in short-wavelength laser cavities are seen to be highly aspheric and very different from the shapes encountered in conventional optics. fabrication tolerance are established by examining the effects of various surface imperfections. the mirrors are found to be relatively insensitive to figur..

blistering of graphite/polymer composites galvanically coupled with metals in sea water. annual rept

carbon reinforced polymer composites are extensively used in aerospace and marine applications. carbon fibers in carbon reinforced composites, being electrically conductive, form galvanic couples when they come into contact with most metals in the presence of an electrolyte. carbon is a noble material and becomes a cathode in the galvanic..

biosensors and bioelectrodes. (latest citations from conference papers index). published search

the bibliography contains citations concerning the manufacture and industrial applications of biosensors and bioelectrodes. topics include implantable biosensors, failure analysis of bioelectrodes, biocompatibility and toxicology of implanted biosensors, fiber optic-based biosensors, enzyme-based biosensors, silicon-based biosensors, and ..

enzyme immobilization. (latest citations from the life sciences collection database). published search

the bibliography contains citations concerning enzyme immobilization. topics include enzyme immobilization onto gel matrices, polymer membranes, clays, activated carbon, metal oxides, glass fibers, and polymer microspheres. applications are described, including biocatalysts, antibiotic production, elisa tests, and immunoassays. immobiliza..

mali microenterprise sector assessment and strategy. volume one main report. technical rept

the report focuses on the need to strengthen mali's micro- and small-scale enterprise (mse) sector as a means of stimulating economic opportunity and lowering the country's level of political turmoil. it analyzes the state of mse activities, describes institutions involved in promoting mse's, and identifies constraints to and opportunitie..

sdio workshop on piezoelectric ceramic actuators for space applications held in alexandria, virginia on 25 february 1992. final rept. jan-may 92

lt. col. michael obal of the sdio materials and structures office sponsored this workshop on piezoceramic actuators for space applications. its purpose was threefold: to promote communications among the appropriate groups; to focus and prioritize issues for near-team improvements in actuator performance; and to identify and suggest resear..

polymeric prosthetic devices and materials. (latest citations from the u.s. patent database). published search

the bibliography contains citations of selected patents concerning design aspects and production methods of polymeric prosthetic devices which are implanted into the human body. fabrication techniques, specific material compositions, and surface treatment methods used to enhance biocompatibility are presented. patents are presented for de..

electroless plating of polymeric substrates. (latest citations from the u.s. patent database). published search

the bibliography contains citations of selected patents concerning electroless plating techniques used for materials deposition on polymer substrates. topics include plating methods and compositions used in printed circuit device fabrication. plating solution preparations, and substrate surface treatment methods are also included. (contai..

country set, dominica: investment climate statement, january 1988 export trade information

the report outlines the investment climate for dominica. real economic growth in the small caribbean island of dominica has fluctuated over the past several years, reaching six percent in 1984, falling to 1.9 percent in 1985, and rebounding to four percent in 1986. gross domestic product at current prices amounted to $90.2 million ($1047 ..