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Author: John Hu-sen Chang Publisher: ISBN: Category : Gas dynamics Languages : en Pages : 74
Book Description
In this paper experiments are preported on beam intensity and mass separation effects for a mass spectrometer sampling system designed for chemically reacting gases at 1,000K and one atmosphere. The coupling between the reacting chamber and the mass spectrometer was achieved by a supersonic molecular beam of the type suggested by Kantrowitz and Grey. The initial expansion was accomplished by a free jet from a continuum sonic orifice. The system was designed to minimize the change in chemical composition of the sampled gas by orifice boundary layer contamination, sample-skimmer interaction, chemical reactions and condensation during the expansion, mass separation and background gas infiltration. Beams from known sources were generated and sampled. The observed beam intensity and composition were compared to those calculated from theory. This paper also provides a compact statement of the present state of the art of molecular beam technology as it applies to sampling, together with enough background material to illustrate the main requirements imposed on molecular beam systems in this application. (Author).
Author: John Hu-sen Chang Publisher: ISBN: Category : Gas dynamics Languages : en Pages : 74
Book Description
In this paper experiments are preported on beam intensity and mass separation effects for a mass spectrometer sampling system designed for chemically reacting gases at 1,000K and one atmosphere. The coupling between the reacting chamber and the mass spectrometer was achieved by a supersonic molecular beam of the type suggested by Kantrowitz and Grey. The initial expansion was accomplished by a free jet from a continuum sonic orifice. The system was designed to minimize the change in chemical composition of the sampled gas by orifice boundary layer contamination, sample-skimmer interaction, chemical reactions and condensation during the expansion, mass separation and background gas infiltration. Beams from known sources were generated and sampled. The observed beam intensity and composition were compared to those calculated from theory. This paper also provides a compact statement of the present state of the art of molecular beam technology as it applies to sampling, together with enough background material to illustrate the main requirements imposed on molecular beam systems in this application. (Author).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 456
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Michael N. Soltys Publisher: ISBN: Category : Biomass chemicals Languages : en Pages : 0
Book Description
The theory of high pressure, molecular-beam mass spectrometric sampling is briefly reviewed, with a discussion of the principal phenomena that affect results. The hardware and circuits of the sampling and data acquisition system are described. Finally, system performance and capability are reviewed. Representative data outputs are included.
Author: Michael N. Soltys Publisher: ISBN: Category : Biomass chemicals Languages : en Pages : 32
Book Description
The theory of high pressure, molecular-beam mass spectrometric sampling is briefly reviewed, with a discussion of the principal phenomena that affect results. The hardware and circuits of the sampling and data acquisition system are described. Finally, system performance and capability are reviewed. Representative data outputs are included.
Author: George Springer Publisher: Springer Science & Business Media ISBN: 1468419838 Category : Science Languages : en Pages : 377
Book Description
In recent years, emissions from transportation engines have been studied widely because of the contribution of such engines to atmospheric pollution. During this period the amounts of pollutants emitted, the mechanism of their formation, and means of controlling emissions have been investigated in industrial and government laboratories, as well as at universities. The results of these investigations have generally been published as individual articles in journals, transactions, meeting proceedings, and, frequently, in company reports. This proliferation of technical information makes it difficult for workers in the field to keep abreast of all developments. For this reason, the editors felt the need for a book which would survey the existing state of knowledge in wide, albeit selected areas, and would provide a guide to the relevant literature. This book is intended to fulfill this function. It is recognized that all aspects of transportation engine emissions cannot be explored in a single volume. In this book attention is focused primarily on sources and mechanisms of emission formation within the combustion process, and on measurement techniques. Beyond this objective, no re strictions were placed on the authors. Within the framework of the general theme each author has been free to treat his subject as he saw fit. The editors have not strived to replace by uniformity the highly personal and attractive divergences of style. Considerable efforts were made, however, to ensure clarity and minimum overlap between the chapters.
Author: John Hu-sen Chang
Author: John Hu-sen Chang
Author: John Chang
Author: C. A. Stearns
Author: 
Author: Michael N. Soltys
Author: United States. Environmental Protection Agency
Author: Michael N. Soltys
Author: 
Author: 
Author: George Springer