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Physical Sciences and Mathematics Commons™

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University of Nebraska at Omaha

Series

2001

Articles 1 - 7 of 7

Full-Text Articles in Physical Sciences and Mathematics

Composition Operators And A Pull-Back Measure Formula, Valentin Matache Sep 2001

Composition Operators And A Pull-Back Measure Formula, Valentin Matache

Mathematics Faculty Publications

A pull-back measure formula obtained in some particular cases by E. A. Nordgren and this author is generalized in the framework of boundary measures for zero-free Nevanlinna class fuctions on the unit polydisk. The formula is used to characterize the zero-free Nevanlinna class functions which are solutions of Schröder's equation induced by a polydisk automorphism ϕ (i.e. to determine the zero-free functionsf belonging to the Nevanlinna class which are solutions of the functional equationf ° π=λf, for some constant λ), thus generalizing earlier results obtained by R. Mortini and this author.

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Electronic Commerce Application Development: A Comparison Of User And It Professional Perspectives, Douglas Havelka, Deepak Khazanchi Aug 2001

Electronic Commerce Application Development: A Comparison Of User And It Professional Perspectives, Douglas Havelka, Deepak Khazanchi

Information Systems and Quantitative Analysis Faculty Proceedings & Presentations

Based on the theory of reasoned action and previous research identifying differences in beliefs between IS specialists and IS users, this paper outlines a proposed study to investigate differences/similarities in beliefs of users and developers in the context of electronic commerce application development projects. The authors are currently in the process of collecting data to address research question posed in this proposal.

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Dansylation Of Hydroxyl And Carboxylic Acid Functional Groups, Ronald Bartzatt Feb 2001

Dansylation Of Hydroxyl And Carboxylic Acid Functional Groups, Ronald Bartzatt

Chemistry Faculty Publications

Fluorescent labeling of primary and secondary amines using dansyl chloride has been widely used in the past. Its application provides an extremely sensitive means to detect amine functional groups to amounts of less than 1 mg of material. This work describes a method for the dansylation of hydroxyl (–OH) and carboxylic acid (–COOH) functional groups. This technique is demonstrated with ethanol, gamma hydroxy butyric acid (GHB), benzoic acid, and p-chloroaniline. Sensitivity of detection for all compounds are microgram or microliter. For the compounds ethanol and GHB which are liquids at room temperature, as little as 1 ml quantity can be …

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Expanding The Notion Of Relevance In Is Research: A Proposal And Some Recommendations, Deepak Khazanchi, Bjørn Erik Munkvold Jan 2001

Expanding The Notion Of Relevance In Is Research: A Proposal And Some Recommendations, Deepak Khazanchi, Bjørn Erik Munkvold

Information Systems and Quantitative Analysis Faculty Publications

Based on an analysis of a priori discussion on the notion of relevance, this paper proposes a holistic view of relevance in IS research. This expanded notion of relevance incorporates a broader definition of audience/stakeholder, and includes additional dimensions such as scope/value of relevant research, time frame, and "situatedness" of relevance. In view of this definition, it is argued that "practical relevance" is not the sole goal of academic research. Hence, the authors recommend, for example, that knowledge claims in IS need to be better communicated and targeted for the future development and recognition of the IS discipline.

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Order-Disorder Phase Transitions In Kno2 , Csno2, And Tlno2 Crystals: A Molecular Dynamics Study, Chun-Gang Duan, Wai-Ning Mei, Robert W. Smith, Jianjun Liu, M. M. Ossowski, John R. Hardy Jan 2001

Order-Disorder Phase Transitions In Kno2 , Csno2, And Tlno2 Crystals: A Molecular Dynamics Study, Chun-Gang Duan, Wai-Ning Mei, Robert W. Smith, Jianjun Liu, M. M. Ossowski, John R. Hardy

Physics Faculty Publications

The order-disorder phase transitions of KNO2 , CsNO2, and TlNO2 have been studied using parameter-free molecular dynamics simulation. It is found that the phase transitions in nitrites investigated are driven by the rotations of the NO2 2 ions about different axes together with displacements of cations and anions. We successfully reproduce the high-temperature phases of these nitrites, i.e., the NaCl-like structure for KNO2 and CsCl-like structure for Cs(Tl)NO2. Based on the investigation of the radial distribution function of the cations and anions, we explain why KNO2 and Cs(Tl)NO2 form quite different low-temperature phases.

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Numerical Ranges Of Composition Operators, Valentin Matache Jan 2001

Numerical Ranges Of Composition Operators, Valentin Matache

Mathematics Faculty Publications

Composition operators on the Hilbert Hardy space of the unit disk are considered. The shape of their numerical range is determined in the case when the symbol of the composition operator is a monomial or an inner function fixing 0. Several results on the numerical range of composition operators of arbitrary symbol are obtained. It is proved that 1 is an extreme boundary point if and only if 0 is a fixed point of the symbol. If 0 is not a fixed point of the symbol 1 is shown to be interior to the numerical range. Some composition operators whose …

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Iteration Of Λ-Complete Forcing Notions Not Collapsing Λ+, Andrzej Roslanowski Jan 2001

Iteration Of Λ-Complete Forcing Notions Not Collapsing Λ+, Andrzej Roslanowski

Mathematics Faculty Publications

We look for a parallel to the notion of “proper forcing” among λ-complete forcing notions not collapsing λ+. We suggest such a definition and prove that it is preserved by suitable iterations.

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