6,245 research outputs found
Walter R. Crane notebooks, MSS.0366
No full textAbstract: Two bound notebooks of handwritten lecture notes made by Walter R. CraneScope and Content Note: The collection contains two bound notebooks of handwritten notes made by Walter R. Crane. The first page of each notebook says "Columbia University Dept. of Mining, N.Y.C." Both notebooks have a course description pasted in the front as well. It is not known if Crane was a student or teaching at Columbia when these notes were written. The notes are on mining and its various systems, and contain many sketches of equipment, mines, etc.Biographical/Historical Note: Walter Richard Crane was probably born in Massachusetts, in 1870 or 1871. He was a mining engineer and professor of mining engineering and was the author of several books on mining, two of which, Indexes to Mining Engineering Literature, are considered to be classics in the field and are still in print. Crane was possibly associated with the University of Alabama through the U.S. Bureau of Mines, Tuscaloosa Research Center
Zur Entwicklung von Pflege und Pflegewissenschaft
No full textSchaeffer D, Moers M, Rosenbrock R. Zur Entwicklung von Pflege und Pflegewissenschaft. In: Schwartz FW, Walter U, Siegrist J, et al., eds. Public Health: Gesundheit und Gesundheitswesen. 3., überarbeitete Auflage. München: Urban & Fischer; 2012: 308-310
Series 3: Candidacy for Mayor of Los Angeles
No full textA letter to the editor of the Los Angeles Times discusses R. C. Owens' personal experience working with Walter Lindley at the Whittier reform school
Ältere und Alte
No full textGarms-Homolová V, Schaeffer D. Ältere und Alte. In: Schwartz FW, Walter U, Siegrist J, et al., eds. Public Health: Gesundheit und Gesundheitswesen. 3., überarbeitete Auflage. München: Urban & Fischer; 2012: 703-715
The effect of metal type and loading on n-paraffin hydrocracking conversion and selectivity
No full textIncludes bibliographical references.With the continued decline in global oil reserves, there is a growing need to develop alternative sources of conventional fuels to complement the current dependence on crude oil feedstocks. Natural gas, coal and biomass have been identified for this purpose. The distinctive advantage of using natural (stranded) gas is that it is turned into a useful product, thereby increasing its value and reducing the environmental impact of simply flaring it. The value-added work up of natural gas is effected by Gas-to-Liquid conversion via the Fischer-Tropsch Synthesis. Long-chain hydrocarbon waxes are produced and these are subsequently hydrocracked into the required middle distillate fuels, preferably diesel, as diesel engines are more efficient than their petrol counterparts. Hydrocracking may be carried out using a bifunctional catalyst, consisting of metal and acid components. Industrially, hydrocracking is used to crack heavy crude oil fractions into the desired fuel range, however, the catalysts used are sulphided transition metals. These are less suitable for cracking Fischer-Tropsch waxes as they would introduce sulphur into a clean feedstock. Moreover, at reaction temperatures of around 250°C, transition metal sulphide catalysts display little activity. Thus, one may consider noble metals such as palladium or platinum, whilst shape selective zeolites may be used as the acid component
Effects of physical and chemical properties of soils on adsorption of the insecticidal protein (Cry1Ab) from Bacillus thuringiensis at Cry1Ab protein concentrations relevant for experimental field sites
No full textThe adsorption of the insecticidal Cry1Ab protein of Bacillus thuringiensis (Bt) on Na-montmorillonite (M-Na) and soil clay fractions was studied. The aim of this study was not to find the adsorption capacity of the soils from the experimental field site, where Bt corn (MON810) was cultivated, but rather to characterize the adsorption behavior of the Cry1Ab protein at concentrations typically found at experimental field sites. In kinetic experiments, the Cry1Ab protein adsorbed rapidly ( < 60 min) on M-Na. As the concentration of M-Na was varied and the added Cry1Ab protein concentration was kept constant (20 and 45 ng ml(-1)), the adsorption per unit weight of Cry1Ab protein decreased with increasing concentrations of M-Na. Adsorption of Cry1Ab protein on M-Na decreased as the pH value of the suspension increased. All adsorption isotherms could be described mathematically by a linear regression with the parameter k, the distribution coefficient, being the slope of the regression line. Although their mineralogical composition was nearly identical, the soil clay fractions showed different k values. The different k values were correlated with the physical and chemical properties of the soil clay fractions, such as the organic carbon content, the specific external surface area, and the electrokinetic charge of the external surfaces of the clays, as well as with the external surface charge density. An increase in the amount of soil organic matter, as well as an increase in the electrokinetic external surface charge of the soil clays, decreased the distribution coefficient k. An increase of the specific external surface areas of the soil clays resulted in a higher distribution coefficient k. Less than 10% of adsorbed Cry1Ab protein was reversibly adsorbed on the soil clays and, thus, desorbed. The desorption efficiency of distilled water was higher than that of a solution of CaCl2 (2.25 mmol) and of dissolved organic carbon (50 mg Cl-1). (c) 2007 Elsevier Ltd. All rights reserved
Marietta College Freshmen
No full textMarietta College Freshman class, studio portrait. L-R: Arthur Wykle; Ralph Walter; Marguerite Uhrhane (Mariettana, 1931)
Marietta College Pioneer Staff
No full textMarietta College student groups; nine men and five women in studio portrait. The Pioneer Staff. (Mariettana, 1925, p. 120). Front Row (L-R): Mary Catherine Hamilton; Walter Rollins, Jr.; Robert Hansel; Marion Wells; Kenneth Riley. Middle Row (L-R): Alice Baker; Charles Bruny; Harry Witt; Charles Carson; Lucia Manley. Back Row (L-R): Leonard Reardon; W. Knighton Bloom; Ruth Gibson; Dana Wortman (Mariettana, 1925)
Marietta College Mariettana Staff
No full textMarietta College student groups; nine men and one woman in studio portrait. Mariettana Staff. (Mariettana, 1925, p. 116). Front Row (L-R): Howard Thompson; Roselyn Beltz; Joseph C. Folsom. Middle Row (L-R): Harold Mills; Black, Amos; Cather Sargent; Almond F. Shafer. ack Row (L-R): Walter Rollins; Wallace Bower; Albert Ellis (Mariettana, 1925)
- …
