ZIB

21

Digitale Medien

Preparation of l-Arabinose from Mesquite Gum. (1925)

Anderson, Ernest ; Sands, Lila

s.l. : American Chemical Society

Industrial & engineering chemistry 17 (1925), S. 1257-1258

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ISSN: 1520-5045

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ie50192a022

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22

Digitale Medien

Detection of an Interstellar Flux of Gamma-Rays (1964)

METZGER, ALBERT E. ; ANDERSON, ERNEST C. ; VAN DILLA, MARVIN A. ; [weitere]

[s.l.] : Nature Publishing Group

Nature 204 (1964), S. 766-767

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The scintillation spectrometer consisted of a 2-75-in. bevelled caesium iodide (Tl) scintillation crystal, with a plastic scintillator phoswich for the rejection of charged particles2. The mass surrounding the inorganic scintillator crystal has a mean value of approximately 2-5 gm/cm2, the ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/204766a0

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23

Digitale Medien

Radioactive Contamination of Contemporary Lead (1965)

WELLER, RICHARD I. ; ANDERSON, ERNEST C. ; BARKER, JOHN L.

[s.l.] : Nature Publishing Group

Nature 206 (1965), S. 1211-1212

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] DIFFICULTIES in obtaining materials with no contaminant radioactivity1 for the construction of low-level detection equipment have renewed interest in the nature and origin of this activity2,3. Low-level counters are needed in investigations of fall-out, nuclear reactor waste disposal, cosmic ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/2061211a0

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24

Digitale Medien

Differential costs of curricula in Illinois public junior colleges: Some implications for the future (1976)

Warren, John T. ; Anderson, Ernest F. ; Hardin, Thomas L.

Springer

Research in higher education 4 (1976), S. 59-67

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ISSN: 1573-188X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Wissenschaftskunde und Wissenschaftsorganisation, Hochschul- und Universitätswesen, Museumswissenschaft

Notizen: Abstract The purpose of this study was to determine and analyze the annual cost of operation including depreciation of movable capital equipment for educating one student in each curriculum of selected community colleges and to show the relationship of costs of vocational-technical curricula to the cost for common baccalaureate oriented curricula. A stratified sample of eight community colleges was drawn from those that had been in operation for at least five years. These data indicate that a majority of the courses offered in highly specialized curricula in both the occupational and baccalaureate categories were more expansive than those courses that were common to a wide variety of curricula. This study supports differential program funding to assure continued development of high quality vocational-technical programs in community colleges.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00991461

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25

Digitale Medien

Nuclear magnetic relaxation in polymer melts and solutions (1962)

McCall, David W. ; Douglass, Dean C. ; Anderson, Ernest W.

Hoboken, NJ : Wiley-Blackwell

Journal of Polymer Science 59 (1962), S. 301-316

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ISSN: 0022-3832

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Nuclear magnetic relaxation times have been studied in some polymer liquids and solutions. The nonexponential decay of the transverse magnetization has been ascribed to the distribution of molecular weights. The use of such measurements as a means of determining average molecular weights and distributions is discussed. A preliminary application of this use is made for polyethylene. The implications of nuclear magnetic relaxation measurements are discussed in terms of molecular motional processes of the polymer chains.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1962.1205916808

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26

Digitale Medien

Molecular motion in polyethylene. III (1963)

McCall, David W. ; Anderson, Ernest W.

New York : Wiley-Blackwell

Journal of Polymer Science Part A: General Papers 1 (1963), S. 1175-1184

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ISSN: 0449-2951

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Proton magnetic resonance studies of polyethylene have been extended. The relationship of the rigid fraction (NMR) to the crystalline fraction is discussed, and a case is presented for the relative importance of the rigid fraction (or its complement, the mobile fraction). When the polymer has been swollen by low molecular weight solvents, the NMR spectra yield rather direct evidence that the rigid, and presumably crystalline, regions are unaffected. The nature of the molecular motion is discussed in terms of a model, and it is shown that NMR data imply a rather general type motion.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1963.100010409

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27

Digitale Medien

Self-diffusion and nuclear relaxation in polyisobutylene (1963)

McCall, David W. ; Douglass, Dean C. ; Anderson, Ernest W.

New York : Wiley-Blackwell

Journal of Polymer Science Part A: General Papers 1 (1963), S. 1709-1720

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ISSN: 0449-2951

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Various self-diffusion and nuclear relaxation experiments are reported for a polyisobutylene of rather low molecular weight, in bulk and in solution. In the bulk, the self-diffusion coefficient obeys the Arrhenius relation, yielding an activation energy of 5.5 kcal./mole. In solution the activation energies are lower, approaching the value for the solvent at low concentration. The self-diffusion coefficient of the polymer at infinite dilution is 1.2 × 10-5 cm.2/sec. in CS2 and 0.44 × 10-5 cm.2/sec. in CCl4. The ratio is close to the inverse ratio of the solvent viscosities. Measurements of self-diffusion of the solvent have been made for cyclohexane in polyisobutylene. A simple interpretation of the data in terms of Stokes-Einstein models yields molecular dimensions which are too small by a factor of two or three.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1963.100010523

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