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Offshore thermally sprayed aluminium. Application equipment, specifications, standards

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Overview with numerous photos of title process for marine structures, sketches show 5 types of gun (powder flame, wire flame, electric arc, plasma, HVOF). Tables list specifications for some North Sea oil rigs, with adhesion requirements also listed. Norsok recommendations & relevant British Standards are listed.

OFTECH '97

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Report on German Surface Technology Show with Show statistics (visitor numbers etc), cleaning incl. ultrasonic with patented push-pull oscillator, flexible cleaning with automated flood-wash chambers; blasting equip't, anti-graffiti coatings; Pyrosil pretreatment for painting where flame forms thin silica layer; white bronze as nickel alternative replacement; ultra low wear coatings (chromium with silicon carbide dispersion composite), zero discharge electroplating, superhard carbon layers, plasma treatment for sensitive surfaces, new thickness meas't unit (Dr Nix). Electrolytic nickel recovery with rotating cathode, fluidised bed electrolysis (Kubitz); combined membrane filtration; reverse osmosis plant. Lectures featured hard coatings on aluminium & magnesium incl. electrolytic plasma arc (ANOF) Magoxid-Coat (TM).

Oftech '99 - Show Preview

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Preview of title German show at Essen, June 8-10, with details of exhibitors, their addresses & items on show.

Oftech '99 -lowest ever attendance

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Claimed "successful outcome" by organisers of title surface finishing show in Essen last June is not matched by the facts of lowest-ever visitor count. Exhibitors were disappointed. A new date (October 2001) will hopefully bring more attendees.

OFTECH '99, 4th International Show

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Visit to major event at Essen, Germany for industrial surface treatment, where noteworthy displays described incl. blasting using robots, a new hand held blast unit, new basket centrifuge for vibratory finishing plants, vibrating plating unit for printed circuit board production; multi-chamber sputter system for thin film applications, PVD jobbing coaters, developments in vacuum evaporator manufacture; companies accepting spent metalion containing solutions & solids from the plating industry for metal recovery & recycling.

OFTECH - International Fair for Surface Engineering

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Report on title event which included plasma & thin film technology, where highlights include equipment and processes.

Ohmic Constants for Semiconductors

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66 71952 Dutch. n/available

Ohmic Contact Fabrication Technology for SiC Power Devices.

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Ohmic Contacts on n Gallium Arsenide by Spark Alloying

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95 16487 Engl. Sn-Au alloy is electroplated onto n-GaAs and then alloyed by high freq. spark generator. This gives av. contact resistance of 3.9 uOhm which is much the same as obt'd using laser alloying & other methods. High surface temps. are achieved without bulk heating.

Ohmic contacts to p- and n-type gallium arsenide made with Al-Sn-Ni.

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Reports results of investigations into metallization system, Al-Sn-Ni, as ohmic contact to p-type and n-type GaAs. Al-Sn-Ni contact is similar to Al-Ge-Ni in that it makes adequate ohmic contact to both types of GaAs (with specific contact resistances as low as 1.0 x 10E-4 Ohm/sq.cm, but Al-Sn-Ni metallization has more uniform surface morphology after annealing. Metallization scheme is most appropriate for test structures in which rapid turnaround and low processing costs are essential.

Ohmic drop measurement techniques

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Book, date & title unconfirmed, cites work of S Barnartt, JECS Vol. 108 (1961) 102; Amosse & Barbier, Electrochim. Acta Vol. 11 (1966) 1045; Piontelli Z.f. Elektrochemie Vol. 58 (1954) p 54 (Luggin capillary positioning), ibid, Vol. 59 (1955) 778

Ohmic Potential Drop during Alkaline Water Electrolysis.

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A correlation was obtained for the increase of ohmic resistance between the working electrode and the diaphragm owing to the presence of gas bubbles.

Ohmic Resistance Measurement of Bubble Froth Layer in Water Electrolysis under Microgravity.

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JES

OHSA issues chromium PEL of 5µg/cubic metre

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Comment on new and strict limit on airborne hexavalent chromium species with OHSA Fact Sheet on final standard for Cr(VI). The issue also addressed by F Altmayer on pp. 24-25

OHSA proposed chromium PEL and sampling problems

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Disc'n of US health & safety legislation on hexavalent chromium mist and the sampling methodology used, noting flaws in some techniques.. Additional comments on pp. 14 & 15 on this topic.