fabrication issues and concerns related to surface mount printed circuit boards

addresses the effect of surface mount requirements as they are related to the manufacture of bare printed wiring boards. the issues to be discussed include' availability and characteristics of different available surface finishes. this includes hot-air solder leveling, immersion tin-lead and reflow, nickel/gold, flux lacquer and bare copp..

a study of plasma treatment to the surface of carbon fiber for interfacial adhesion to epoxy resin

plasma polymerization is used to modify the surface of carbon fibers and to improve the interfacial adhesion between carbon fibers and epoxy resin. carbon fiber is used as the substrate, acrylonitrile and methyl methacrylate are used as the monomers. the effects of different reaction conditions (reaction time, power, the vapor pressure of..

surface mount international conference and exposition proceedings of the technical program

the following topics were dealt with' mcm materials and packaging technology: chip-on-board: advanced interconnection: packaging ics for multichip modules: smt assembly issues: smt-tab assembly: advanced smt assembly: computer integrated manufacturing: test tissues: inspection and process control: reliability: quality: pcb coatings and pr..

antibacterial activated carbon fiber derived from phenolic resin containing silver nitrate

a novolactype phenolic resin including 1 wt. percent of agno/sub 3/ was spun, hardened, carbonized at 900 degrees c under nitrogen and finally activated at 900 degrees c for 10 and 60 min under steam. the resulting fibers showed specific n/sub 2/-bet surface areas of 280 and 1940 m/sup 2//g, respectively. the latter contained 2.2 wt. perc..

nanometer scale patterning of a monolayer langmuir-blodgett film with a scanning tunneling microscope in air

nanometer scale patterns have been fabricated on a langmuir-blodgett deposited monolayer film of stearic acid using a scanning tunneling microscope in air. carbon deposits build up underneath the tip for tip voltages with absolute value greater than 4 v. using an atomic force microscope for image, lines 25 nm wide on a 60 nm period have b..

incorporation of a proton-related donor in the near-surface region of gaas upon plasma hydrogenation

hydrogenation of gaas crystals was performed by using a remote-plasma configuration with three electrodes in the reactor to distinguish the roles of neutral-radicals ions and electron species schottky diodes fabricated with the wafers hydrogenated in the h+-dominated atmosphere showed lower and higher barrier heights for n- and p-type sub..

influence of dry and wet cleaning on the properties of rapid thermal grown and deposited gate dielectrics

various silicon surface cleaning processes for rapid thermal in-situ polysilicon/oxide/silicon stacked gate structures have been evaluated. metal-oxide-semiconductor capacitors were fabricated to assess the effects of cleaning on the quality of gate oxide structures produced by both rapid thermal oxidation (rto) and rapid thermal chemical..

performance of hybrid reinforcements in pcv composites. i. use of surface-modified mica and wood pulp as reinforcements

the hybrid behavior of surface-treated mica and hardwood chemithermomechanical pulp (ctmp) in pvc composites was investigated. in order to improve the compatibility of wood fibers with pvc and surface-coated mica, ctmp was subjected to different surface modifications by pretreating the fibers with maleic anhydride (ma), a mixture of ma an..

low damage processing of semiconductor quantum structures

the fabrication of quantum-confined structures with critical dimensions of <100 nm places severe constraints on the processes used. high resolution techniques such as electron beam lithography are necessary, but not sufficient to guarantee high quality quantum structures. these structures are particularly sensitive to process-induced defe..

mathematical models for cotton crop management

the situation where a crop manager has direct access to a computer is increasingly common. this has the potential to cause profound changes in crop management, but the requisite software is as yet largely unavilable. here a preliminary report is presented on a package of computer programs designed to aid in cotton crop management. the pac..