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Author:
Publisher:
ISBN:
Category : Mathematical analysis
Languages : en
Pages : 126
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Author:
Publisher:
ISBN:
Category : Mathematical analysis
Languages : en
Pages : 126
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Book Description
Author: K. Paech
Publisher: Springer Science & Business Media
ISBN: 3642805302
Category : Science
Languages : en
Pages : 560
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Author: K. Paech
Publisher: Springer Science & Business Media
ISBN: 3642649580
Category : Science
Languages : en
Pages : 774
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Book Description
If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the chicle is extracted with benzene which dissolves both isomers. An excess absolute ethyl acetate is added and the mixture stored at 5° C overnight. The gutta precipitates out and the rubber remains in solution. The other method is as follows: (1) Ten grams of chicle are extracted with acetone for 24 hours in a Soxhlet extraction apparatus. (2) The insoluble material in the thimble is allowed to .. it dry, then immersed in 150 ml. of cold Skellysolve B in a refrigerator at 10° C and· allowed to stand for 48 hours with occasional agitation. (3) The thimble is then removed from the solvent and the enclosed residue washed several times with fresh, cold Skellysolve B. (4) An excess of acetone and a few drops of a concentrated aqueous solution of sodium iodide are added to the combined Skellysolve B extract and washings and allowed to stand overnight in a refrigerator.
Author: K. Biemann
Publisher: Springer Science & Business Media
ISBN: 3642459935
Category : Science
Languages : en
Pages : 563
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Book Description
123 phase and hence have no direct bearing on the retention time of solutes. However in gas-solid chromatography, a considerable quantity of the mobile phase may be adsorbed on the surface of the stationary adsorbent which diminishes the column's effective length and ability to retain solutes. In this respect helium has been found to be preferable to most other gases (GREENE and Roy, 1957) because it is adsorbed to the least extent. 3. Packed columns offer a considerable resistance to flow, which may create a pressure differential between inlet and outlet of sufficient magnitude to cause an unfavorable flow rate through a significant length of the column. A reduced inlet/outlet pressure ratio can be obtained by using light molecular weight gases toward which the column packing shows the greatest permeability. The flow rate of the mobile phase is normally adjusted by altering the column inlet pressure, for which purpose commercial pressure regulators of sufficient accuracy are available. Quantitative measurements of the flow rate can be made by a number of methods, including rotameters, orifice meters, soapfilm flow meters and displacement of water. The former two methods are the most con venient but the least accurate; moreover they create a back pressure and are temperature dependent whereas although the moving soap bubble is cumbersome to employ and unusable for continuous readings, it is preferred when the highest accuracy is required.
Author:
Publisher: Springer Science & Business Media
ISBN: 3642481418
Category : Science
Languages : en
Pages : 759
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Author:
Publisher:
ISBN:
Category : Languages, Modern
Languages : en
Pages : 220
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Book Description
Author: Mariano Giaquinta
Publisher: Springer Science & Business Media
ISBN: 0817643753
Category : Mathematics
Languages : en
Pages : 475
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Book Description
Examines linear structures, the topology of metric spaces, and continuity in infinite dimensions, with detailed coverage at the graduate level Includes applications to geometry and differential equations, numerous beautiful illustrations, examples, exercises, historical notes, and comprehensive index May be used in graduate seminars and courses or as a reference text by mathematicians, physicists, and engineers
Author: José M. Amigó
Publisher: Springer Nature
ISBN: 3031300149
Category : Mathematics
Languages : en
Pages : 273
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Book Description
The book includes selected contributions presented at the "International Meeting on Functional Analysis and Continuous Optimization" held in Elche (Spain) on June 16–17, 2022. Its contents cover very recent results in functional analysis, continuous optimization and the interplay between these disciplines. Therefore, this book showcases current research on functional analysis and optimization with individual contributions, as well as new developments in both areas. As a result, the reader will find useful information and stimulating ideas.
Author: Augustin Louis Baron Cauchy
Publisher: World Scientific
ISBN: 9789971506667
Category : Mathematics
Languages : en
Pages : 1010
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Book Description
This volume aims at surveying and exposing the main ideas and principles accumulated in a number of theories of Mathematical Analysis. The underlying methodological principle is to develop a unified approach to various kinds of problems. In the papers presented, outstanding research scientists discuss the present state of the art and the broad spectrum of topics in the theory.
Author:
Publisher: Elsevier
ISBN: 0080871399
Category : Mathematics
Languages : en
Pages : 337
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Book Description
Saks Spaces and Applications to Functional Analysis
