Precise doping of metals by small gas flows

Simple method was developed for doping refractory metals with oxygen. The metal specimens are heated in a dynamic high-vacuum system. The system can be used for other oxygen absorption processes /such as low-pressure oxidation measurements/ and for gases other than oxygen

It\u27s Time for a Good Hard Look in the Mirror: The Corporate Law Example

This Article asserts that the move from the industrial age to the information age represents a fundamental change to our society on such a widespread basis that the legal order must reexamine the premises about how our society functions, assessing whether foundational elements of U.S. Common Law remain valid. This Article first confronts briefly the continuing acceptance of certain foundational premises in contract and intellectual property law, illustrating that such premises are no longer supported by the realities of modern society. With fundamental change challenging multiple areas of law in the information age, this problem is worthy of widespread inquiry by legal scholars in various fields. This Article then turns to a detailed analysis of the premises supporting shareholder primacy in corporate law, demonstrating that the historic justifications for allocations of ownership, control and duties no longer support these premises. Based on the relative needs of today’s businesses vis-à-vis the contributions of various other constituencies, this Article asserts that employees should also have certain duties owed to them. This Article concludes with a novel model for creating such a stake in the form of a springing right to profit sharing

The 100,000-hour cyclic oxidation behavior at 815C (1500 F) of 33 high-temperature alloys

Commercial high-temperature Fe-, Ni-, and Co-base alloys were oxidized in air at 815 deg C for ten 1000-hour cycles. Specific weight change versus time curves were derived and the 10,000-hour surface oxides were analyzed by X-ray diffraction. The alloys were ranked by a combination of appearance and metal loss estimates derived from gravimetric data

A multiple linear regression analysis of hot corrosion attack on a series of nickel base turbine alloys

Multiple linear regression analysis was used to determine an equation for estimating hot corrosion attack for a series of Ni base cast turbine alloys. The U transform (i.e., 1/sin (% A/100) to the 1/2) was shown to give the best estimate of the dependent variable, y. A complete second degree equation is described for the centered" weight chemistries for the elements Cr, Al, Ti, Mo, W, Cb, Ta, and Co. In addition linear terms for the minor elements C, B, and Zr were added for a basic 47 term equation. The best reduced equation was determined by the stepwise selection method with essentially 13 terms. The Cr term was found to be the most important accounting for 60 percent of the explained variability hot corrosion attack

The effect of variations of cobalt content on the cyclic oxidation resistance of selected Ni-base superalloys

Cobalt levels were systematically varied in the Ni-base turbine alloys U-700 (cast), U-700m(PM/HIP), Waspaloy, Mar-M-247, In-738, Nimonic-115, U-720, and SX-R-150. The cobalt levels ranged from 0 wt % to the nominal commercial content in each alloy. The alloys were tested in cyclic oxidation in static air at 1000, 1100 and 1150 C for 500, 200 and 100 hr respectively. An oxidation attack parameter, Ka derived from the specific weight change versus time data was used to evaluate the oxidation behavior of the alloys along with X-ray diffraction analysis of the surface oxides. The alloys tend to form either Cr2O3/chromite spinel or Al2O3/aluminate spinel depending on the CR/Al ratio in the alloys. Alloys with a ratio of 3.5 or higher tend to favor the Cr oxides while those under 3.0 form mostly Al oxides. In general the Al2O3/aluminate spinel forming alloys have the better oxidation resistance. Increased cobalt content lowers the scaling resistance of the higher Cr alloys while a 5.0 wt % Co content is optimum for the Al controlling alloys. The refractory metals, particularly Ta, appear beneficial to both types of oxides perhaps due to the formation of the omni-present trirutile Ni(Ta,Cb,Mo,W)2O6. Both scales break down as increasing amounts of NiO is formed

Office Rent Determinants during Market Decline and Recovery

This article empirically examines office rent determinants in distinct periods of a market cycle. The study uses a dataset of office properties located in a large metropolitan area and spanning a six-year period. During this period, office rents experienced a significant decline and recovery. A time-varying parameter rent index identifies three distinct periods of the cycle: decline, trough and recovery. Tests of structural change conclude that market participants value the determinants of office rents differently during the periods. A microexamination of each rent determinant over the periods of the market cycle provides a greater understanding of how rents vary over time and the factors that influence them.

Design and fabrication of four pin high pressure squib

Development of high pressure squibs for deep space probe vehicle

The effect of 0.1 atomic percent zirconium on the cyclic oxidation behavior of beta-NiAl for 300 hours at 1200 C

The long time effect of 0.1 at percent Zr (0.2 wt percent Zr) on the cyclic oxidation behavior of hipped beta-NiAl was studied. Oxidation testing was performed in static air at 1200 C for up to 3000 one-hour exposure cycles. Specific weight change versus time data was modeled with the COSP computer program to analyze cyclic oxidation behavior. The Zr-free stoichiometric alloy oxidized and spalled randomly to bare metal between cycles at a rate high enough to deplete Al to a low enough level that oxidation breakaway took place as nonprotective NiO replaced the alpha-Al2O3/NiAl2O4 scale as the controlling oxide. The Zr minimized this severe type of spalling maintaining the protective alpha-Al2O3 scale even out to 3000 hours for the stoichiometric alloy with no significant Al depletion. A third beta-NiAl alloy containing 0.1 at percent Zr but with 10 percent less Al than the stoichiometric alloy was also tested and showed some depletion of Al, but the protective Al2O3/NiAl2O4 was still maintained to close to 2700 hours

The scanning electron microscope as a tool in space biology

Normal erythrocytes are disc-shaped and are referred to here descriptively as discocytes. Several morphologically variant forms occur nomally but in rather small amounts, usually less than one percent of total. It has been shown though, that spiculed variant forms referred to as echinocytes are generated in significant amounts at zero g. Normal red cells have been stressed in vitro in an effort to duplicate the observed discocyte-echinocyte transformation at zero g. The significance of this transformation to extended stay in space and some of the plausible reasons for this transformation are discussed

Developing an early childhood teacher workforce development strategy for rural and remote communities

The North West Early Childhood and Primary Teacher Workforce Development Strategy offers students in the Pilbara and Kimberley the opportunity to enrol in a Western Australian University’s fully accredited Bachelor of Education (Early Childhood and Primary) part time and externally – so they can continue to live and work in their communities. The Western Australian Department of Education and Training (WA DET) and the Commonwealth Government Department of Education, Employment and Workplace Relations (DEEWR) have funded the project, enabling the University to provide mentoring support and provision for Recognition of Prior Learning, on a case-by-case basis, depending on their individual experience and levels of skill. On completion of the course students will be fully qualified to teach from Kindergarten to Year 7. Added to this they will be able to bring their own knowledge of their unique communities, languages and cultures to their teaching