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Der winzige Struwwelpeter
Essay and history of the folk character Struwwelpeter, translated variously as "Slovely Peter," "Shock-headed Peter," Boy with shock of unkempt bristly hair" etc. This character was well known to Mark Twain, and would have been an influence for his character Huckleberry Finn.
Date:
1982
Creator:
Massmann, Robert E.
Object Type:
Book
System:
The UNT Digital Library
Full coupled cluster singles, doubles and triples model for the description of electron correlation
Equations for the determination of the cluster coefficients in a full coupled cluster theory involving single, double and triple cluster operators with respect to an independent particle reference, expressible as a single determinant of spin-orbitals, are derived. The resulting wave operator is full, or untruncated, consistant with the choice of cluster operator truncation and the requirements of the connected cluster theorem. A time-independent diagrammatic approach, based on second quantization and the Wick theorem, is employed. Final equations are presented that avoid the construction of rank three intermediary tensors. The model is seen to be a computationally viable, size-extensive, high-level description of electron correlation in small polyatomic molecules.
Date:
October 1, 1984
Creator:
Hoffmann, Mark Reinhard
Object Type:
Report
System:
The UNT Digital Library
Neurons with hysteresis from a network that can learn without any changes in synaptic connection strengths
A neural network concept derived from an analogy between the immune system and the central nervous system is outlined. The theory is based on a neuron that is slightly more complicated than the conventional McCullogh-Pitts type of neuron, in that is exhibits hysteresis at the single cell level. This added complication is compensated by the fact that a network of such neurons is able to learn without the necessity for any changes in synaptic connection strengths. The learning occurs as a neural consequence of interactions between the network and its environment, with environmental stimuli moving the system around in an N-dimensional phase space, until a point in phase space is reached such that the system's responses are appropriate for dealing with the stimuli. Due to the hysteresis associated with each neuron, the system tends to stay in the region of phase space where it is located. The theory includes a role for sleep in learning. 18 refs., 2 figs.
Date:
January 1, 1986
Creator:
Hoffmann, G. W. & Benson, M. W.
Object Type:
Article
System:
The UNT Digital Library
Proceedings of the LAMPF workshop on physics with polarized nuclear targets
Topics of discussion included static and dynamic methods for polarizing nuclei, proton and pion nucleus scattering experiments, and possible future experiments at LAMPF. Separate abstracts were prepared for 11 papers in this report. (DWL)
Date:
August 1, 1986
Creator:
Burleson, G.; Gibbs, W.; Hoffmann, G.; Jarmer, J. J. & Tanaka, N. (eds.)
Object Type:
Article
System:
The UNT Digital Library
Positron-annihilation study of the equilibrium vacancy ensemble in aluminum
A preliminary report is presented of a positron-annihilation study of the equilibrium vacancy ensemble in aluminum using one- and two-dimensional angular correlation of annihilation radiation (ACAR) measurements versus temperature. The annihilation characteristics of a positron from the Bloch state, and the monovancy- and divacancy-trapped states have been calculated self-consistently within a supercell, including many-body enhancement effects, and are compared with experiment. 4 figures.
Date:
June 1, 1982
Creator:
Fluss, M. J.; Berko, S.; Chakraborty, B.; Hoffmann, K.; Lippel, P. & Siegel, R. W.
Object Type:
Article
System:
The UNT Digital Library
Positron-annihilation spectroscopy of vacancy defects in aluminum
Positron-annihilation characteristics in a monovacancy and a divacancy in aluminium have been calculated self-consistently using a local density functional formalism, into which the many-body enhancement effects have been incorporated. Results for the theoretical two-dimensional angular correlation of annihilation radiation spectra are compared to experimental results obtained from an aluminum single crystal at 20/sup 0/C, where positrons annihilate from a Bloch-state, and at higher temperatures, 500/sup 0/C and 630/sup 0/C, where they annihilate primarily from vacancy-trapped states.
Date:
June 1, 1982
Creator:
Chakraborty, B.; Berko, S.; Fluss, M. J.; Hoffmann, K.; Lippel, P. & Siegel, R. W.
Object Type:
Article
System:
The UNT Digital Library
Study of the equilibrium vacancy ensemble in aluminum using 1D- and 2D-angular correlation of annihilation radiation
One- and two-dimensional angular correlation of positron-electron annihilation radiation (1D and 2D-ACAR) data have been obtained between 293 and 903 K for single crystals of aluminum. The peak counting rates vs temperature, which were measured using the 1D-ACAR technique, provide a model independent value for the temperature dependence of the positron trapping probability. Using these results it is possible to strip out the Bloch state contribution from the observed 2D-ACAR surfaces and then compare the resulting defect ACAR surfaces to calculated 2D-ACAR surfaces for positrons annihilating from the Bloch, monovacancy, and divacancy-trapped states. The result of this comparison is that the presence of an increasing equilibrium divacancy population is consistent with the observed temperature dependence of ACAR data at high temperature in Al and that the present results when compared to earlier studies on Al indicate that the ratio of the trapping rates at divacancies and monovacancies is of order two.
Date:
March 12, 1985
Creator:
Fluss, M.J.; Berko, S.; Chakraborty, B.; Hoffmann, K.R.; Lippel, P. & Siegel, R.W.
Object Type:
Article
System:
The UNT Digital Library
Dynamic polarization of ZF in a fluorinated alcohol
We have studied microwave dynamic cooling of ZF and H nuclei in mixtures of 1,1,1,3,3,3-hexafluoro-2-propanol and water, doped with Cr(V) complex. Equal spin temperatures of the two nuclei are produced, and the highest spin polarizations (/approximately/80%) are found in mixtures near the eutectic ratio. The high fluorine content and polarization make this a suitable material for polarized nuclear scattering experiments. 11 refs., 3 figs., 1 tab.
Date:
January 1, 1988
Creator:
Hill, D.; Kasprzyk, T.; Jarmer, J. J.; Penttilae, S.; Krumpolc, M.; Hoffmann, G. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Beam foil spectroscopy of N = 3 to N = 2 transitions in highly stripped heavy ions. Revision 1
The spectroscopy of very highly ionized atoms provides an important testing ground for multi-electron atomic theory. We report preliminary experimental results on the n = 3 ..-->.. 2 spectra of Bi/sup +73/ and A/sup +69/ obtained at the GSI UNILAC accelerator. 19 refs., 4 figs.
Date:
September 1, 1986
Creator:
Dietrich, D.D.; Chandler, G.A.; Egan, P.O.; Ziock, K.P.; Mokler, P.H.; Reusch, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Spectroscopy of quasimolecular x rays with H-like decelerated ions
The quasimolecular 2p..pi..-1s tau transition energy as a function of the internuclear distance is obtained from the interference structure observed in quasimolecular K-x-ray spectra from low energy H-like projectiles measured at certain impact parameters. 15 references, 7 figures.
Date:
November 1, 1984
Creator:
Schmidt-Boecking, H.; Schuch, R.; Tserruya, I.; Hoffmann, R.; Johnson, B.; Jones, K. W. et al.
Object Type:
Article
System:
The UNT Digital Library
First polarization results from the LAMPF /sup 13/C target
A polarized /sup 13/C target has been developed and used to measure spin observables for 500-MeV p - /sup 13/C elastic scattering. The material was ethylene glycol, /sup 13/C/sub 2/H/sub 6/O/sub 2/, enriched to 99% in /sup 13/C. Both the /sup 13/C and /sup 1/H spins were dynamically polarized in a /sup 3/He refrigerator at 2.5-T magnetic field. The polarization of both species was measured by using the NMR thermal equilibrium calibration technique. In addition, the polarization of /sup 1/H was independently measured by p-p scattering. We described the target and reported on the polarizations obtained and the dependence of the polarizations on integrated beam intensity. 9 refs., 3 figs., 1 tab.
Date:
January 1, 1988
Creator:
Penttila, S. I.; Amann, J. F.; Jarmer, J. J.; Jones, K. W.; Tanaka, N.; Barlett, M. L. et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B1100.0113]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Miss Rodeo America contestants, Karen Roberts, Miss Oklahoma, Paig Hoffmann, Miss Alabama, and tamy Rae Anders, Miss Montana, add last-mintute touches at fashion show."
Date:
November 29, 1984
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1100.0113]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Miss Rodeo America contestants, Karen Roberts, Miss Oklahoma, Paig Hoffmann, Miss Alabama, and tamy Rae Anders, Miss Montana, add last-mintute touches at fashion show."
Date:
November 29, 1984
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
German-Texan Heritage Society Newsletter, Volume 4, Number 2, Summer 1982
Newsletter of the German-Texan Heritage Society providing information about news and events related to the work of the organization as well as stories, articles, genealogical data and other information of interest to members collected from representatives across Texas.
Date:
Summer 1982
Creator:
German-Texan Heritage Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Pony Express (Carthage, Tex.), Vol. 37, No. 5, Ed. 1 Monday, December 8, 1986
Newspaper from Panola Junior College in Carthage, Texas that includes news of interest to the college community along with advertising.
Date:
December 8, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 61, No. 19, Ed. 1 Friday, March 13, 1987
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
March 13, 1987
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
LAMPF: proposal status and summaries
Revisions and additions are given for LAMPF proposal summaries and status reports. These apply to LA-7444-MS. (GHT)
Date:
March 1, 1982
Creator:
Rayburn, L. & Talley, B. (comps.)
Object Type:
Report
System:
The UNT Digital Library
The Pony Express (Carthage, Tex.), Vol. 38, No. 5, Ed. 1 Monday, November 23, 1987
Newspaper from Panola Junior College in Carthage, Texas that includes news of interest to the college community along with advertising.
Date:
November 23, 1987
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 61, No. 20, Ed. 1 Friday, March 20, 1987
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
March 20, 1987
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Pony Express (Carthage, Tex.), Vol. 40, No. 4, Ed. 1 Monday, October 30, 1989
Newspaper from Panola College in Carthage, Texas that includes news of interest to the college community along with advertising.
Date:
October 30, 1989
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Pony Express (Carthage, Tex.), Vol. 34, No. 6, Ed. 1 Monday, December 12, 1983
Newspaper from Panola Junior College in Carthage, Texas that includes news of interest to the college community along with advertising.
Date:
December 12, 1983
Creator:
Duncan, Susan C.
Object Type:
Newspaper
System:
The Portal to Texas History
Progress at LAMPF: Clinton P. Anderson Meson Physics Facility. Progress report, July-December 1980
Progress at LAMPF is the semiannual progress report of the MP Division of the Los Alamos National Laboratory. The report also includes brief reports on research done at LAMPF by researchers from other institutions and Los Alamos divisions.
Date:
March 1, 1981
Creator:
Allred, J.C. (ed.)
Object Type:
Report
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 64, No. 45, Ed. 1 Tuesday, December 6, 1988
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
December 6, 1988
Creator:
Ernst, Peggy
Object Type:
Newspaper
System:
The Portal to Texas History
Phosphine Substitution in n5-Cyclopentadienyl-Bis-Triphenylphosphinecobalt (I): Evidence for a Dissociative Mechanism
The substitution of trimethylphosphine for triphenylphosphine in {eta}{sup 5}-cyclopentadienyl-bis-triphenylphosphinecobalt(I), 1, to form {eta}{sup 5}-cyclopentadienyltrimethylphosphinetriphenylphosphinecobalt(I) was studied at -60°C in an NMR spectrometer. Kinetic measurements show the process to be first order in 1 and zero order in PMe{sub 3}; added PPh{sub 3} strongly inhibits the reaction rate. This information indicates the reaction proceeds by rapid reversible phosphine dissociation through the unsaturated CpCo(PPh{sub 3}) intermediate. The rate for generation of that intermediate, k{sub 1}, is 1.15 x 10{sup -3} sec{sup -1} while the ratio of rate constant k{sub 2} (for conversion of intermediate to products) to k{sub -1} (return to starting materials) is 4 at -60°C. Possible structures for CpCo(L) are discussed in light of recent indications that the linear structure has an open-shell electronic configuration.
Date:
June 1, 1980
Creator:
Janowicz, Andrew H.; Bryndza, Henry E. & Bergman, Robert G.
Object Type:
Article
System:
The UNT Digital Library