8,603 research outputs found
Parastatistics of charged bosons partly localised by impurities
Coulomb repulsion is taken into account to derive the thermodynamics of
charged bosons in a random external potential. A simple analytical form of the
partition function is proposed for the case of non-overlapping localised states
(i.e. a small amount of disorder). The density of localised bosons and the
specific heat show a peculiar non-uniform temperature dependence below the
Bose-Einstein condensation temperature. The superfluid - Bose-glass phase
diagram is discussed. A new phase is predicted which is a Bose-glass at T=0 but
a superfluid at finite T.Comment: 6 pages, Revtex, 6 figures (available on request from the authors
Chaotic transients in the switching of roto-breathers
By integrating a set of model equations for Josephson ladder subjected to a
uniform transverse bias current we have found almost all of the kinds of
breathers described in recent experiments, and closely reproduced their
voltage-current characteristics and switching behaviour. Our main result is
that a chaotic transient occurs in the switching process. The growth of tiny
perturbations during the chaotic transient causes the new breather
configuration to be extremely sensitive to the precise history of the initial
breather and can also cause the new breather to have a new centre of symmetry.Comment: 6 pages, 4 figure
The Labor Supply and Retirement Behavior of China's Older Workers and Elderly in Comparative Perspective
This paper highlights the employment patterns of Chinaâs over-45 population and, for perspective, places them in the context of work and retirement patterns in Indonesia, Korea, the United States, and the United Kingdom. As is common in many developing countries, China can be characterized as having two retirement systems: a formal system, under which urban employees receive generous pensions and face mandatory retirement by age 60, and an informal system, under which rural residents and individuals in the informal sector rely on family support in old age and have much longer working lives. Gender differences in age of exit from work are shown to be much greater in urban China than in rural areas, and also greater than observed in Korea and Indonesia. Descriptive evidence is presented suggesting that pension eligible workers are far more likely to cease productive activity at a relatively young age. A strong relationship between health status and labor supply in rural areas is observed, indicating the potential role that improvements in access to health care may play in extending working lives and also providing some basis for a common perception that older rural residents tend to work as long as they are physically capable. The paper concludes with a discussion of measures that may facilitate longer working lives as Chinaâs population ages.retirement, population aging, labor supply, pensions, China, Indonesia, Korea
Vol. 1 Ch. 9 The Genealogical Connections between Particular Hopewellian and Mississippian Avian Motifs and Themes
https://ideaexchange.uakron.edu/encountering_hopewell/1008/thumbnail.jp
INCREASES IN COSTS AND RETURNS DUE TO INTENSIFYING RANGE FORAGE PRODUCTION SURVEYS: AN INFORMATION ECONOMIC ANALYSIS
The U.S. Congress and courts have directed federal natural resource agencies to use better information for management decisions than they have used in the past. It is also important for these agencies to improve the efficiency of resource use where possible. This information economics study estimates increased costs and revenues which can be directly imputed to improving the accuracy of range forage production surveys. It suggests that a high level of survey accuracy may often be justifiable.Crop Production/Industries, Research Methods/ Statistical Methods,
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