• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 480
  • 72
  • 63
  • 17
  • 15
  • 15
  • 15
  • 15
  • 15
  • 14
  • 10
  • 8
  • 5
  • 5
  • 4
  • Tagged with
  • 775
  • 775
  • 103
  • 65
  • 64
  • 64
  • 53
  • 38
  • 38
  • 33
  • 28
  • 28
  • 26
  • 26
  • 25
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

An accurate method for the relative measuring of spectral intensities with an application to the determination of Planck's constant O2 ...

Vermeulen, Dirk. January 1935 (has links)
Proefschrift--Utrecht. / Preliminary note in Dutch. "The problem involved has been treated in two parts ... The precision of an absolute energy measurement has been ... [dealt with in' the thesis written by J. Weuda."--Introd. "List of literature cited": p. [60].

Spectral analysis by discrete and continuous autoregressive moving average models

Madiwale, Appasaheb Ningappa. January 1978 (has links)
Thesis--University of Wisconsin--Madison. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 342-354).

Studies in spectrochemical analysis

Nachtrieb, Norman H. January 1941 (has links)
Thesis (Ph. D.)--University of Chicago, 1941. / A dissertation submitted to the faculty of the division of the physical sciences in candidacy for the degree of Doctor of Philosophy. Includes bibliographical references.

Die K-Emissions- und Absorptionspektren der Elemente Kalium bis Kupfer und einiger ihrer Oxyde

Sanner, V. Hugo. January 1941 (has links)
Inaug.-Diss.--Uppsala. / "Litteraturverzeichnis": p. [95]-96.

Fast AR and ARMA modelling and spectrum analysis

Pandelidis, Ioannis Onoufriou. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 187-193).

Spectral estimation of random time series

MacCormick, Alasdair John Anderson. January 1964 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 71-73.

Changes in the wave-frequencies of the lines of emission spectra of elements, their dependence upon the elements themselves and upon the physical conditions under which they are produced

Humphreys, W. J. January 1897 (has links)
Thesis (Ph. D.)--Johns Hopkins University. / Cover title. Biographical sketch. Reprinted from the Astrophysical journal. v. 6, no. 3, Oct. 1897.

The spectra of iodine

Barss, Walter Malcomson January 1939 (has links)
[No abstract available] / Science, Faculty of / Physics and Astronomy, Department of / Graduate

The electronic spectra of crystalline charge-transfer complexes.

Lower, Stephen Kent January 1963 (has links)
Charge-transfer complexes of the aromatic hydrocarbon-trinitrobenzene type are stabilized principally by interaction between a dative- and a "no-bond" state: φN= a ψ₀ (DA) + b ψ₁ (D⁺A¯) . The resulting complexes usually possess a colour which is associated with an electronic transition between the ground state φN and a predominantly dative excited state; the transition therefore corresponds to the partial transfer of an electron from the donor (D- usually the hydrocarbon) to the acceptor (A). Most of the previous spectroscopic work on CT complexes has been concerned with solutions of the complexes; no detailed investigation of a crystalline complex has been made. The somewhat random nature of CT interaction in solution tends to limit the amount of information we can gain from such studies, and this has prompted the present work on solid complexes. With a system of definite composition and structure, both the spectroscopic examination and theoretical treatment can be carried out at a more quantitative level. The results of a detailed spectroscopic study of the crystalline anthracene-trinitrobenzene complex are presented. It is shown that 1) The CT transition moment is strongly polarized parallel to the c-axis of the crystal (approximately perpendicular to the molecular planes), with a polarization ratio greater than that predicted by the simple oriented gas model. 2) A portion of the intensity of the CT state is derived from mixing with the more intense ¹La state of anthracene, confirming the prediction of J. Murrell. 3) The crystal emission spectrum consists almost entirely of CT fluorescence with vibrational structure similar to that of the absorption. The entire spectrum is blue-shifted with respect to that of the rigid-glass solution; as in solution, there is a very wide gap between the absorption and fluorescence origins. 4) The emission intensity is strongly temperature dependent; a portion of this dependence is reversible, while the remainder is apparently connected with the creation of crystal defects on cooling, and cannot be reversed. It is suggested that the CT state is highly delocalized in the crystal, and that the transition dipole moment connecting the ground- and CT states must be polarized along the c-axis of the crystal, rather than between the centers of the individual donor-acceptor pairs. A number of TNB complexes of other hydrocarbons were studied, although in much less detail. Their spectroscopic properties appear to be similar to those of anthracene-TNB. Polarized phosphorescence- and triplet-triplet absorption spectra of several aromatic hydrocarbons dissolved in crystalline benzophenone are given. This is the first reported observation of triplet-triplet absorption in crystals, and it is shown that it is polarized mainly in the planes of the molecules investigated. / Science, Faculty of / Chemistry, Department of / Graduate

The high frequency discharge spectrum of C C1(4) and C C1(2) F(2)

Collins, Thomas LeGear January 1943 (has links)
[No abstract submitted] / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Page generated in 0.0546 seconds