cnc electrical discharge machining centers. final report. progress rept

computer numerical control (cnc) electrical discharge machining (edm) centers were investigated to evaluate the application and cost effectiveness of establishing this capability at allied-signal inc., kansas city division (kcd). in line with this investigation, metal samples were designed, prepared, and machined on an existing 15-year-ol..

effect of protective surface layers on the dynamic response of laminate and sandwich panels in low velocity impact loading

the purpose of the study was to compare the impact behavior of laminate and sandwich panels and to determine the effect of protective surface layers on the impact response. test materials used in the study were glassfiber/vinylester laminates and glassfiber/vinylester/pvc-core sandwich structures. polypropylene and polyurethane were used ..

preoxidation cleaning optimization for crystalline silicon

a series of controlled experiments has been performed in sandia's photovoltaic device fabrication laboratory to evaluate the effect of various chemical surface treatments on the recombination lifetime of crystalline silicon wafers subjected to a high-temperature dry oxidation. from this series of experiments we have deduced a relatively s..

armering med geonaet vid foerstaerkning av vaeg. prov vid backe 1991. byggnadsrapport (reinforcement with geogrid in road strengthening. experiment at backe 1990. construction report)

the report describes an experiment in which geogrids were used to strengthen an existing road. the experiment was carried out during summer 1990 on road 331 at backe in the county of jamtland, northern sweden. the aim of the experiment was to determine whether reinforcement of a road pavement can reduce the amount of pavement material req..

development and indigenization of nuclear fuel technology for kmrr

a driver fuel is needed for the safe and efficient operation of kmrr. the purpose of this project is to design and fabricate the kmrr fuel by our own technology. the works for 1989/1990 have been done as follows: (i) the design manual, preliminary technical specification, test specification for flow test, and kmrr fuel bundle drawings in ..

kuitu energy-efficient mechanical pulping. interim report 1988-1990

the aim of the kuitu or fibre progranmme is to raise the competitiveness of papermakers and manufacturers of related equipment through more economical use of energy. the targets to be reached by 1993 are to find ways of reducing, through process modifications, the specific energy consumption in mechanical pulping by 10-20 , to determine t..

evaluation of the fabricability of advanced austenitic tubing

the us department of energy advanced research and technology development (ar&&td) fossil energy materials program in 1986 began a six-year activity to investigate candidate alloys fro advanced steam cycle superheaters and reheaters. the specific advanced austenitic alloys of interest were defined through a screening program which assessed..

laser materials: radiation damage. january 1980-december 1991 (citations from the ntis database). rept. for jan 80-dec 91

the bibliography contains citations concerning laser beam damage to laser materials, including optical glass, mirrors, optical coatings, dielectrics, semiconductors, and alkali metal halides. the damage mechanisms are explored for various types of laser materials comparisons are made between variations in fabrication and preparation of th..

use of unconventional fibres for the manufacture of fabrics, sitra coimbatore, india. technical report: chemical modification of pineapple leaf fibres

the objective is to plan and conduct experiments on chemical modification and enzymatic degumming of pineapple leaf fibers (palf) with a view to producing finer fibers, and to advise on dyeing and finishing of palf and other leaf fibers. because of the variability of palf, care must be taken to ensure thorough randomization of the fibers ..

laser interferometric measurement of ion electrode shape and charge exchange erosion

a projected fringe profilometry system was applied to surface contour measurements of an accelerator electrode from an ion thrustor. the system permitted noncontact, nondestructive evaluation of the fine and gross structure of the electrode. a 3-d surface map of a dished electrode was generated without altering the electrode surface. the ..