29,849 research outputs found
Influence of AlN precipitation on thermodynamic parameters in Al-V-N microalloyed steels
No full textAn estimation of the equilibrium compositions of the austenite and carbonitride phases, as well as the mole fraction of each phase in C-Al-V-N microalloyed steels at different austenitising temperatures was made by calculations based on experimental data. Further, a comparison of the mole fraction was made from two thermodynamic models due to Adrian and Rios, with and without considering aluminium in the steels. The results indicate that both models produce very similar results and can be used to calculate the equilibrium parameters and predict the solution temperature of carbonitrides and aluminium nitride in the range 800–1300°C for an alloy system contained up to three microalloying elements and aluminium. Both models predict that most of the carbon remains in solution at the calculated temperature. When AlN precipitation is included in the calculation, it is seen that the mole fraction of the carbonitrides fP and the atomic fraction of carbon in the interstitial lattice of the carbonitrides fC decreases, while the atomic fraction of nitrogen in the interstitial lattice of carbonitride fN, increases. The effect of aluminium on these equilibrium parameters depends on the chemical composition of the steel. Increasing the contents of Al, N, C, and V together in the experimental steels has a more significant influence on these equilibrium parameters than changing only the contents of Al; Al and V or Al and N
Book review: El Sistema: orchestrating Venezuela’s youth, by Geoffrey Baker
No full textBook review of: El Sistema: orchestrating Venezuela’s youth, by Geoffrey Baker.
New York, NY: Oxford University Press, 2014; ISBN: 9780199341559
($35.00)Publisher PD
Letter from W. T. Johnson to L. A. Baker of Monroe, N. C.
No full textLetter from W. T. Johnson to L. A. Baker of Monroe, N. C., concerning applications for the Peace Corps sent in by members of his NFA chapter
World War I record of service survey for Harold T. Baker, signed 27 August 1922
No full textQuestionnaire about Harold Tower Baker's service in World War I, 1917-1919, signed by Baker on 27 August 1922.Questionnaire originally part of a survey of Norwich University alumni conducted by a “Norwich in the World War” committee consisting of Charles N. Barber (chairman), Carl V. Woodbury, K.R.B. Flint, and Gustaf A. Nelson. Data from these questionnaires may have been used in a chapter of "Vermont in the world war, 1917-1919" by Harold P. Sheldon (1928). Transcription by Carina Berg. Transcriptions may be subject to error
[Letter from T. N. Carswell to Robert G. Davis, Daniel Baker College - May 29, 1942]
No full textA letter written to Dr. Robert G. Davis, President, Daniel Baker College, Brownwood, Texas, from T. N. Carswell, Chairman 24th Senatorial District Drys, dated May 29, 1942. Carswell requests a reply to a letter written on March 6 in regards to the question of what Christian Colleges are doing about the use of Beverage Alcohol
Personal performance: the resistant confessions of Bobby Baker
No full textAn analysis of the confessional performances of performance artist, Bobby Baker, in particular 'Box Story'
Processes, microstructure and properties of vanadium microalloyed steels
No full textVanadium as an important alloying element in steels was initially associated with the properties achieved following tempering. Interest in the microstructure was stimulated by the advent of transmission electron microscopes with a resolution of ~1nm together with selected area electron diffraction techniques. A second timely development was that of controlled rolling, particularly of plate and sheet products. The scope of this review will include the historical background on quenched and tempered vanadium steels, precipitation during isothermal aging, conventional controlled rolling and during thin slab direct charging and the development of strength and toughness in vanadium microalloyed steels. The characterisation of microstructure, in particular the methods for the analysis of the chemical composition of precipitates, has progressed since the availability of X-ray energy dispersive analysis in the 1970s, and the role played by electron energy loss spectroscopy in providing quantitative analysis of carbon and nitrogen in vanadium microalloyed steels will be presented. There are still many topics involving vanadium microalloyed steels that are controversial. These include the nucleation sequence of homogeneous precipitates of vanadium carbonitride and whether this occurs coherently, the composition of the vanadium precipitates, the nucleation mechanism for interphase precipitation, the importance of strain induced precipitation in austenite of vanadium carbonitride, the contributions of both interphase precipitation and random precipitation in ferrite to the yield strength, and the role of the process route parameters in developing properties. These topics will be considered in this paper which concentrates on hot rolled vanadium microalloyed steels placed in the context of pertinent research on other alloys
Letter from Lillian Baker to Erwin N. Thompson, National Park Service, May 18, 1984
No full textPhotocopy of letter from Lillian Baker to Erwin Thompson submitting guidelines for the proposed national historic landmark site at Manzanar, California with book order form and award notice attached.The Japanese American Relocation Collection is composed of ephemera related to the relocation program during World War II. Items include the official government report of Manzanar Relocation Center, a photo album, post-war activism materials related to preserving and remembering the camps, various clippings, and documents. The strength of this collection is found in its many perspectives on the controversial relocation program and how it has been presented since World War II
[Letter from T. N. Carswell to Peggy Carswell - March 31, 1932]
No full textA letter written to "Baby-Doll" [Peggy Carswell], from "Daddy" [T. N. Carswell], dated March 31, 1932. Carswell advises that he is enclosing a letter from Mrs. Baker and expresses his pleasure that she did so well as to receive such praise from Mrs. Halter
Batsto Nature Area brochure front
No full textFront of brochure features a year by year history of the Batsto family lands, furnace and glass works. There is also a small road map showing directions to Batsto. Brochure and historical village administered by the state Department of Conservation and Economic Development, Robert A. Roe, Commissioner and Kenneth H. Creveling, Director, Division of Resource Development. Arthur D. Pierce, author and Raymond N. Baker, artist
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