effect of shot peening on fatigue of a ni-based superalloy

experimental investigations were carried out to study the effects of shot peening on the fatigue life of a ni-based superalloy, designated as ew 868, which is used in aircraft engines for the manufacture of cooling shells, chambers, nozzles etc. shot peening is imparted to the material in the fabrication process to improve the fatigue lif..

passivation techniques for silicon solar cells

the use of heteroepitaxial wide bandgap semiconductor films for passivation of silicon surfaces is presented. the particular films discussed here comprise either gap or zns/sub 1-x/se/sub x/, grown by metalorganic chemical vapor deposition. ideally, such films should transmit majority carriers but reflect minority carriers, and should thu..

potentiometric solid-state oxygen sensor using lanthanum fluoride operative at room temperature

a solid electrolyte oxygen sensor using an laf/sub 3/ single crystal was examined for detection of oxygen at room temperature the potential of the sensing electrode relative to that of the reference electrode varied almost logarithmically with the oxygen partial pressure. while newly fabricated elements showed a very slow response, their ..

electronic applications of molecular films

extremely thin films, a few molecules in thickness, offer many potential applications for the fabrication of new types of semiconductor devices. the author discusses the deposition of very uniform thin films by the langmuir-blodgett technique. the application of the film in very high resolution resists developed for electron beam lithogra..

an optimized in situ argon sputter cleaning process for device quality low-temperature (t

a novel in situ argon sputter cleaning process has been developed for the deposition of high-quality low-temperature (t/sub dep/

photoemission study of cd loss and its effect on the electronic structure of etched hg/sub 1-x/cd/sub x/te surfaces

quantitative measurements using x-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy have been made of the cd loss and surface fermi-level position (e/sub f,s/) on hg/sub 1-x/cd/sub x/te substrates that have undergone chemical surface preparation. the surface cleaning techniques employed were representative of those..

photochemical cleaning and epitaxy of si

photochemical effect on silicon surface cleaning and epitaxial film growth was investigated. under ultraviolet light irradiation, the surface native oxide on the silicon substrate was removed at 730 degrees c. an epitaxial film with high crystal quality was grown on the silicon substrate at a temperature as low as 540 degrees c after ther..

preparation of small diameter sensors for continuous clinical monitoring

fluorescence-based fiber optic sensors have been prepared which give rapid and reversible responses. a technique has been developed for the covalent chemical modification of the fiber's distal surface which is easily adapted to the smallest diameter glass optical fiber (100 mu m). the sensing layer is attached directly to the fiber surfac..

the impact of key gaas material parameters on device applications

the difficulty of realizing practical device applications is complicated because of the unclear phenomena between material parameters and device performance. it is, therefore, extremely important to understand the impact of key material properties on devices and correlate those material parameters to preparation techniques (synthesis, cry..

photoluminescence imaging as a technique to control the uniformity of the electronic properties of semiconductor surface during device fabrication

the authors have developed a new compact, versatile and automated system for spatially resolved photoluminescence (pl) measurements which is described in detail in the first part of this contribution. the image of the pl intensity is obtained by scanning the semiconductor surface with a he-ne laser light focused by a microscope objective...