1,427 research outputs found
Absence of an isotope effect in the magnetic resonance in high- superconductors
An inelastic neutron scattering experiment has been performed in the
high-temperature superconductor to search for an
oxygen-isotope shift of the well-known magnetic resonance mode at 41 meV.
Contrary to a recent prediction (I. Eremin, {\it et al.}, Phys. Rev. B {\bf
69}, 094517 (2004)), a negligible shift (at best +0.2 meV) of the
resonance energy is observed upon oxygen isotope substitution
(OO). This suggests a negligible spin-phonon interaction in
the high- cuprates at optimal doping.Comment: 3 figure
The Development and Application of a Process-oriented Thermometer of IT Business Value
The issue of whether firms are receiving an adequate return on their investment in information technology (IT) continues to pervade managerial decision making. While productivity and other financial metrics are established hallmarks of IT investment evaluation, research has called for broader and richer metrics that can take into account the diversity of IT impacts. In this paper, we extend previous instrument development research to develop and test a process-oriented thermometer of IT business value using survey data based on executives\u27 perceptions of IT impacts at multiple points along the value chain. Consistent with earlier research, we find that our process measures are sensitive to differences in industry, firm size, and business strategy. Through additional analysis of post-implementation reviews of IT impacts in four firms, we find consistency of within-firm perceptual measures among teams of senior executives, highlighting the potential for our thermometer to gauge the level of IT impacts within a single firm. We conclude that process-oriented perceptual measures can offer new and useful insights into IT impacts, complementing what we already know from firm-level objective metrics
On the Dichotomy between the Nodal and Antinodal Excitations in High-temperature Superconductors
Angle-resolved photoemission data on optimally- and under-doped high
temperature superconductors reveal a dichotomy between the nodal and antinodal
electronic excitations. In this paper we propose an explanation of this unusual
phenomenon by employing the coupling between the quasiparticle and the
commensurate/incommensurate magnetic excitations.Comment: 11 pages, 9 figure
Measurement of Newtonian fluid slip using a torsional ultrasonic oscillator
The composite torsional ultrasonic oscillator, a versatile experimental
system, can be used to investigate slip of Newtonian fluid at a smooth surface.
A rigorous analysis of slip-dependent damping for the oscillator is presented.
Initially, the phenomenon of finite surface slip and the slip length are
considered for a half-space of Newtonian fluid in contact with a smooth,
oscillating solid surface. Definitions are revisited and clarified in light of
inconsistencies in the literature. We point out that, in general oscillating
flows, Navier's slip length b is a complex number. An intuitive velocity
discontinuity parameter of unrestricted phase is used to describe the effect of
slip on measurement of viscous shear damping. The analysis is applied to the
composite oscillator and preliminary experimental work for a 40 kHz oscillator
is presented. The Non-Slip Boundary Condition (NSBC) has been verified for a
hydrophobic surface in water to within ~60 nm of |b|=0 nm. Experiments were
carried out at shear rate amplitudes between 230 and 6800 /s, corresponding to
linear displacement amplitudes between 3.2 and 96 nm.Comment: Revised with minor edits for revie
Information Technology and the Search for Organizational Agility: A Systematic Review with Future Research Possibilities
Organizations are increasingly turning to information technology (IT) to help them respond to unanticipated environmental threats and opportunities. In this paper, we introduce a systematic review of the literature on IT-enabled agility, helping to establish the boundary between what we know and what we don’t know. We base our review on a wide body of literature drawn from the AIS Basket of Eight IT journals, a cross-section of non-Basket journals, IT practitioner outlets, and premier international IS conferences. We review the use of different theoretical lenses used to investigate the relationship between IT and organizational agility and how the literature has conceptualized agility, its antecedents, and consequences. We also map the evolution of the literature through a series of stages that highlight how researchers have built on previous work. Lastly, we discuss opportunities for future research in an effort to close important gaps in our understanding
The Role of IT Application Orchestration Capability in Improving Agility and Performance
This paper investigates how IT application orchestration – a dynamic capability encapsulating a firm’s ability to refresh its application portfolio through a process of building, buying, and retiring IT applications – impacts firm performance. We propose a conceptual model in which the effect of IT application orchestration on firm performance is mediated by process agility. We further propose that a firm’s strategic orientation moderates the effect of IT application orchestration capability on process agility. Analysis of data from an international survey of IT executives supports our proposed hypotheses. This research contributes to the emergent literature on dynamic capabilities by proposing and testing a theory of how IT application orchestration capability affects agility and firm performance
- …