Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions

In this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.

The school use of Cleveland's Public Library.

"One of a series of bulletins on what Cleveland's public schools are doing."

Further negative results regarding the use of continued fractions for digital computer arithmetic /

Mode of access: Internet.

On a negative result regarding the use of continued fractions for digital computer arithmetic /

Includes bibliographical references.

The status of investigations into the use of continued fractions for computer hardware /

Bibliography: p. 29.

A sequel to the Common school grammar; containing, in addition to other materials and illustrations, notes and critical remarks on the philosophy of the English language; and explaining some of its most difficult idiomatic phrases. Designed for the use of the first class in common schools.

Mode of access: Internet.

Sanders' high school reader : embracing a comprehensive course of instruction in the principles of rhetorical reading with a choice collection of exercises in reading both in prose and poetry : for the use of the higher classes in schools of every grade /

Mode of access: Internet.

An elementary textbook on applications of the calculus to mechanics; prepared for the use of the junior class in the Sheffield Scientific School.

Mimeographed with manuscript corrections.

The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy ...

"A dissertation on the rise and progress of the modern art of navigation," by James Wilson: v. 1, p. [i]-xxx.

Portsmouth Sunday school hymn book : compiled for the use of the South Parish Sunday school.

Without music.

Binomial theorem and logarithms. For the use of the midshipmen at the naval school, Philadelphia.

Preface signed: William Chauvenet.

A classical French reader; selected from the best writers of that language in prose and poetry; preceded by an introduction, designed to facilitate the study of the rudiments of the French. And attended with notes, explanatory of idioms, etc. throughout the work. Compiled for the use of the round hill school,

[1. Containing pieces in prose.--2. Containing pieces in poetry.]

Observations on grammar and its arrangement, for the use of the Grammar School, Leeds.

Mode of access: Internet.

A first Latin course : comprehending grammar, delectus, and exercise-book, with vocabularies : for use of the lower forms in public and private schools : with the cases arranged both as in the ordinary grammars and as in the public school primer.

Mode of access: Internet.

An elementary treatise on mechanics, for the use of the junior classes at the university and the higher classes in school, with a collection of examples.

Mode of access: Internet.