The columbium-hydrogen system and hydrogen embrittlement of columbium

Columbium specimens are charged uniformly with hydrogen allowing accurate measurement of the hydrogen content by a procedure involving the removal of hydrogen from flowing argon at 2000 degrees F. Hydrogen content effects on the ductile-to-transition temperature are determined for temperatures between 200 and 600 degrees F

The Retention of Wet Strength Resins as Determined by the Kjeldahl Method

True wet strength is not a gauge of water proofness of paper, but is a measure of the residual strength of the paper gauged by the mullen, tear, burst, and fold, after the paper has been completely soaked in water and the resistance to water penetration has been completely broken (1). To increase the wet-strength of paper, a number of different resins may be applied, and these resins may be broadly classified as anionic or cationic in nature. Of these resins, three particular resins will be discussed, cationic melamine-formaldehyde, anionic urea-formaldehyde, and cationic urea-formaldehyde

Internet Sales Taxes From Borders to Amazon: How Long Before All of Your Purchases Are Taxed?

What so many internet consumers believe to be tax-free is actually subject to a state use tax. Faced with pressure from states that realize very little of the use tax owed, many online retailers, such as Wal-mart, voluntarily collect sales taxes from their customers. But a recent California Appeals Court decision, Borders Online v. State Board of Equalization, could mark a shift towards more prevalent, if not universal, taxation of internet retail

Laser in Clinical Ophthalmology: Possible Applications, Limitations, and Hazards

The present status of laser application in clinical ophthalmology is discussed. The differences between conventional light coagulator characteristics and those of presently available ruby lasers for clinical use are compared. The limitations and hazards of laser therapy are stressed

Purification train produces ultrapure hydrogen gas

Three-stage purification train produces ultrapure hydrogen gas at 1000 psi from K-bottles of high-purity hydrogen. The continuous process incorporates deoxidation and dehydration units and a molecular sieve