8,962 research outputs found
Propagating and evanescent internal waves in a deep ocean model
We present experimental and computational studies of the propagation of
internal waves in a stratified fluid with an exponential density profile that
models the deep ocean. The buoyancy frequency profile (proportional to
the square root of the density gradient) varies smoothly by more than an order
of magnitude over the fluid depth, as is common in the deep ocean. The
nonuniform stratification is characterized by a turning depth , where
is equal to the wave frequency and .
Internal waves reflect from the turning depth and become evanescent below the
turning depth. The energy flux below the turning depth is shown to decay
exponentially with a decay constant given by , which is the horizontal
wavenumber at the turning depth. The viscous decay of the vertical velocity
amplitude of the incoming and reflected waves above the turning depth agree
within a few percent with a previously untested theory for a fluid of arbitrary
stratification [Kistovich and Chashechkin, J. App. Mech. Tech. Phys. 39,
729-737 (1998)].Comment: 13 pages, 4 figures, 4 table
Identification of functional information subgraphs in complex networks
We present a general information theoretic approach for identifying
functional subgraphs in complex networks where the dynamics of each node are
observable. We show that the uncertainty in the state of each node can be
expressed as a sum of information quantities involving a growing number of
correlated variables at other nodes. We demonstrate that each term in this sum
is generated by successively conditioning mutual informations on new measured
variables, in a way analogous to a discrete differential calculus. The analogy
to a Taylor series suggests efficient search algorithms for determining the
state of a target variable in terms of functional groups of other degrees of
freedom. We apply this methodology to electrophysiological recordings of
networks of cortical neurons grown it in vitro. Despite strong stochasticity,
we show that each cell's patterns of firing are generally explained by the
activity of a small number of other neurons. We identify these neuronal
subgraphs in terms of their mutually redundant or synergetic character and
reconstruct neuronal circuits that account for the state of each target cell.Comment: 4 pages, 4 figure
Do Industrial Relations Institutions Impact Economic Outcomes?: International and U.S. State-Level Evidence
The impact of government social and labor market institutions on economic outcomes have generated a great deal of attention by economists and policymakers in the U.S. and in other nations. The theoretical model suggests that there are trade offs of higher levels of economic outcomes with more equity-producing labor market institutions. This study examines the impact of national levels of unionization, strike levels, public policies toward labor, and the structure of collective bargaining within a nation on a country's foreign direct investment (FDI). As an additional test of the relationship of labor market institutions and state labor market policies and economic outcomes, we examine the empirical relationship with the economic growth of U.S. states. Examining 20 OECD nations from 1985 through 1995 and all U.S. states from 1990 to 1999, our statistical analysis shows that higher levels of industrial relations institutions are usually associated with lower levels of FDI and slower economic growth for U.S. states. However, within the context of the model the results do not necessarily suggest that a nation or state would be better off trading social equity through fewer restrictive industrial relations institutions for higher levels of economic growth.
Observations of time delayed all-optical routing in a slow light regime
We report an observation of a delayed all-optical routing/switching
phenomenon based on ultraslow group velocity of light via nondegenerate
four-wave mixing processes in a defected solid medium. Unlike previous
demonstrations of enhanced four-wave mixing processes using the slow light
effects, the present observation demonstrates a direct retrieval of the
resonant Raman-pulse excited spin coherence into photon coherence through
coherence conversion processes.Comment: 5 pages with 3 figures include
Does Migration Make You Happy?:A Longitudinal Study of Internal Migration and Subjective Well-Being
The majority of modelling studies on consequences of internal migration focus almost exclusively on the labour market outcomes and the material well-being of migrants. We investigate whether individuals who migrate within the UK become happier after the move than they were before it and whether the effect is permanent or transient. Using life satisfaction responses from 12 waves of the British Household Panel Survey (BHPS) and employing a fixed-effects model, we derive a temporal pattern of migrants’ subjective wellbeing (SWB) around the time of the migration event. Our findings make an original contribution by revealing for the first time that, on average, migration is preceded by a period when individuals experience a significant decline in happiness. The boost that is received through migration appears to bring people back to their initial level of happiness. As opposed to labour market outcomes of migration, SWB outcomes do not differ significantly between men and women. Perhaps surprisingly, long-distance migrants are at least as happy as short-distance migrants despite the higher social costs that are involved
A longitudinal study of migration propensities for mixed-ethnic unions in England and Wales
This research was funded by the ESRC under the Understanding Population Trends and Processes (UPTAP) programme (Award Ref: RES-163-25-0045).Most studies investigating residential segregation of ethnic minorities ignore the fact that the majority of adults live in couples. In recent years there has been a growth in the number of mixed-ethnic unions that involve a minority member and a white member. To our knowledge, hardly any research has been undertaken to explicitly examine whether the ethnic mix within households has an impact on the residential mobility of households in terms of the ethnic mix of destination neighbourhoods. Our study addresses this research gap and examines the tendencies of mobility among mixed-ethnic unions in comparison with their co-ethnic peers. We used data from the Longitudinal Study for England and Wales. Our statistical analysis supports the spatial assimilation theory; ethnic minorities move towards less deprived areas and to a lesser extent also towards less ethnically concentrated areas. However, the types of destination neighbourhood of minority people living in mixed-ethnic unions varied greatly with the ethnicity of the ethnic minority partner.PostprintPeer reviewe
Pengaruh Customer Relationship Management (Crm) Terhadap Customer Satisfaction Dan Customer Loyalty Pada Pelanggan Matahari Department Store
This study was conducted to determine the effect Benefits of Customer Relationship Management and Customer satisfation to Customer Loyalty in Customers Matahari Department Store. Customer relationship management (CRM) is part of a marketing strategy to get satisfaction and increase customer loyalty. CRM and customer satisfaction can encourage customer loyalty where customers do not easily switch to other companies. The population is all customers Matahari Department Store, and the sample are customers of at least 2 times shopping at Matahari Department Store and have the customer's card or MCC were selected by purposive sampling and analytical techniques used is Partial Least Square (PLS) and the Statistical product and Service Solutions (SPSS). The research proves that CRM has a positive effect on customer loyalty and customer satisfaction has positive influence on loyalty. Customer satisfaction does not affect the relationship CRM to customer loyalty
Generation of macroscopic superposition states with small nonlinearity
We suggest a scheme to generate a macroscopic superposition state
(Schrodinger cat state) of a free-propagating optical field using a beam
splitter, homodyne measurement and a very small Kerr nonlinear effect. Our
scheme makes it possible to considerably reduce the required nonlinear effect
to generate an optical cat state using simple and efficient optical elements.Comment: Significantly improved version, to be published in PRA as a Rapid
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