36,912 research outputs found
Digitale Langzeitarchivierung als Thema internationaler Institutionen und Organisationen : Ein bibliotheksorientierter Ăberblick
Long-term digital archiving is not only the concern of numerous national organizations, but also the topic of international institutions and projects. This article takes a survey and comments on the relevant activities of thirteen international and european organizations which are involved with education and information as a whole or librarianship in particular. These have dealt till now, however, primarily â sometimes multi-tracked â with fundamental or theoretical questions; the implementation of practical solutions has been rare and may well be left for the future. (journal editor's abstract
Electrodynamics of superconductors
An alternate set of equations to describe the electrodynamics of
superconductors at a macroscopic level is proposed. These equations resemble
equations originally proposed by the London brothers but later discarded by
them. Unlike the conventional London equations the alternate equations are
relativistically covariant, and they can be understood as arising from the
'rigidity' of the superfluid wave function in a relativistically covariant
microscopic theory. They predict that an internal 'spontaneous' electric field
exists in superconductors, and that externally applied electric fields, both
longitudinal and transverse, are screened over a London penetration length, as
magnetic fields are. The associated longitudinal dielectric function predicts a
much steeper plasmon dispersion relation than the conventional theory, and a
blue shift of the minimum plasmon frequency for small samples. It is argued
that the conventional London equations lead to difficulties that are removed in
the present theory, and that the proposed equations do not contradict any known
experimental facts. Experimental tests are discussed.Comment: Small changes following referee's and editor's comments; to be
published in Phys.Rev.
The DLESE Community Review System: Gathering, Aggregating, and Disseminating User Feedback about the Effectiveness of Web-based Educational Resources
NOTE: This is a large file, 8 mb in size! The Community Review System (CRS) of the Digital Library for Earth System Education (DLESE) is intended to help educators seeking high-quality digital resources and resource creators who are seeking recognition for their resources. This article describes how CRS gathers web-based feedback from educators and learners who have used DLESE educational resources, plus specialist reviews by science and pedagogy experts. This information is used to identify exemplary resources to be showcased in the DLESE Reviewed Collection. Detailed, but anonymous, feedback is provided to the resource creator to encourage improvement of the resource. Educational levels: Graduate or professional, Graduate or professional
Editorâs Note
Denna studie Ă€mnar att beskriva hur kunskapsintensiva företag hanterar den kunskap som konsulter bidrar med vid introduktion, i det dagliga arbetet och hur de möjliggör för överföring av kunskapen nĂ€r konsulten lĂ€mnar företaget. En fallstudie pĂ„ tvĂ„ stora internationella företag har genomförts och empiri samlades in genom semistrukturerade intervjuer. Resultatet visar att företagen har likartade introduktioner med fokus pĂ„ organisatoriska och individuella kunskaper. Vilket syfte konsulten har i företaget pĂ„verkar kunskapsintegreringen inom arbetet. Ăven organisationsstrukturen och konsultens placering inom företaget har effekter för kunskapsintegreringen. Konsulten bidrar med flexibilitet, vilket innebĂ€r att företaget bör strĂ€va efter att genomföra integrerande praktiker under arbetets gĂ„ng, och inte fokusera pĂ„ överlĂ€mningen enbart nĂ€r konsulten lĂ€mnar företaget
Editor\u27s Introduction (Review Symposium on \u3ci\u3eConverging Divergences: Worldwide Changes in Employment Systems\u3c/i\u3e)
[Excerpt] During the past two decades there have been significant changes in employment systems across industrialized countries. Converging Divergences: Worldwide Changes in Employment Systems, by Harry C. Katz and Owen Darbishire, examines changes since 1980 in employment practices in seven industrialized countriesâthe United States, the United Kingdom, Australia, Germany, Japan, Sweden, and Italyâwith a focus on the automotive and telecommunications industries. Katz and Darbishire find that variations in employment patterns within these countries have been increasing over the past two decades. The increase in variation is not simply a result of a decline in union strength in some sectors of the economy; variation has increased within both union and nonunion sectors. Despite this within-country divergence, Katz and Darbishire find that employment systems across countries are converging toward four common patterns of work practices: a low-wage employment pattern; the human resource management (HRM) employment pattern; a Japanese-oriented employment pattern; and a joint team-based employment pattern. Significant differences in national employment-related institutions have resulted in some variation across countries in how these work patterns are implemented. Still, Katz and Darbishire find that there are many commonalities in the employment systems of the seven countries and in the processes through which these commonalities have developed
Editor\u27s Introduction
The editor\u27s introduction to this issue
Quantum Multibaker Maps: Extreme Quantum Regime
We introduce a family of models for quantum mechanical, one-dimensional
random walks, called quantum multibaker maps (QMB). These are Weyl
quantizations of the classical multibaker models previously considered by
Gaspard, Tasaki and others. Depending on the properties of the phases
parametrizing the quantization, we consider only two classes of the QMB maps:
uniform and random. Uniform QMB maps are characterized by phases which are the
same in every unit cell of the multibaker chain. Random QMB maps have phases
that vary randomly from unit cell to unit cell. The eigenstates in the former
case are extended while in the latter they are localized. In the uniform case
and for large , analytic solutions can be obtained for the time
dependent quantum states for periodic chains and for open chains with absorbing
boundary conditions. Steady state solutions and the properties of the
relaxation to a steady state for a uniform QMB chain in contact with
``particle'' reservoirs can also be described analytically. The analytical
results are consistent with, and confirmed by, results obtained from numerical
methods. We report here results for the deep quantum regime (large ) of
the uniform QMB, as well as some results for the random QMB. We leave the
moderate and small results as well as further consideration of the
other versions of the QMB for further publications.Comment: 17 pages, referee's and editor's comments addresse
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