The impact of demographic change on U. S. labor markets

According to the U. S. Census Bureau projections, the United States will face dramatic demographic changes over the next one hundred years. Indeed, the country will be entering largely uncharted territory. In the twenty-first century, the population is expected to grow more slowly than ever before over an extended period. The population will also age rapidly, with the share of the population over 65 climbing to a succession of new record highs. Finally, the United States will once again become a nation of immigrants. Over the past decade, the wave of new immigrants has already neared proportions last seen in the early 1900s at the end of the Great Migrations. And this inflow is projected to persist throughout the coming century, with new immigrants and the children of those immigrants contributing well over half of the increase in the U. S. population. Because the source of this inflow has shifted from Europe to Latin America and Asia, this new wave will change the voice and face of America forever.Demography ; Economic conditions ; Labor market

Seismic shifts: the economic impact of demographic change: an overview

Most economic developments are hard to predict. Considerable uncertainty surrounds forecasts for output growth, inflation, and unemployment a year from now, for instance. But demographic developments are different in this respect. Although demographic surprises abound, the major trends build slowly, and the broad contours of medium-term outcomes become discernible well in advance.Demography ; Economic conditions

Self-similar impulsive capillary waves on a ligament

We study the short-time dynamics of a liquid ligament, held between two solid cylinders, when one is impulsively accelerated along its axis. A set of one-dimensional equations in the slender-slope approximation is used to describe the dynamics, including surface tension and viscous effects. An exact self-similar solution to the linearized equations is successfully compared to experiments made with millimetric ligaments. Another non-linear self-similar solution of the full set of equations is found numerically. Both the linear and non-linear solutions show that the axial depth at which the liquid is affected by the motion of the cylinder scales like $\sqrt{t}$. The non-linear solution presents the peculiar feature that there exists a maximum driving velocity $U^\star$ above which the solution disappears, a phenomenon probably related to the de-pinning of the contact line observed in experiments for large pulling velocities

Measuring subdiffusion parameters

We propose a method to extract from experimental data the subdiffusion parameter $\alpha$ and subdiffusion coefficient $D_\alpha$ which are defined by means of the relation $=2D_\alpha/\Gamma(1+\alpha) t^\alpha$ where $$ denotes a mean square displacement of a random walker starting from $x=0$ at the initial time $t=0$. The method exploits a membrane system where a substance of interest is transported in a solvent from one vessel to another across a thin membrane which plays here only an auxiliary role. Using such a system, we experimentally study a diffusion of glucose and sucrose in a gel solvent. We find a fully analytic solution of the fractional subdiffusion equation with the initial and boundary conditions representing the system under study. Confronting the experimental data with the derived formulas, we show a subdiffusive character of the sugar transport in gel solvent. We precisely determine the parameter $\alpha$, which is smaller than 1, and the subdiffusion coefficient $D_\alpha$.Comment: 17 pages, 9 figures, revised, to appear in Phys. Rev.

Advances and challenges in umbilical cord blood and tissue bioprocessing: procurement and storage

Umbilical cord tissue and blood is banked to complement the rapidly advancing field of tissue engineering and regenerative medicine for both autologous and allogeneic therapeutic applications. Whilst many problems concerning the use of the hematopoietic and multipotential mesenchymal stromal cells contained therein may be addressed through the future development of GMP-compliant manufacturing strategies, collection and bioprocessing of these tissues can be optimised in the present to maximise clinical outcomes. In this review, we describe current procurement, processing and storage approaches for umbilical cord blood and tissue; current challenges and how these may be met to augment translation and use of therapeutics harnessing their derivatives

Children with autism spectrum disorder (ASD) attend typically to faces and objects presented within their picture communication systems

ackground Children with autism spectrum disorder (ASD) may require interventions for communication difficulties. One type of intervention is picture communication symbols which are proposed to improve comprehension of linguistic input for children with ASD. However, atypical attention to faces and objects is widely reported across the autism spectrum for several types of stimuli. Method In this study we used eye-tracking methodology to explore fixation duration and time taken to fixate on the object and face areas within picture communication symbols. Twenty-one children with ASD were compared with typically developing matched groups. Results Children with ASD were shown to have similar fixation patterns on face and object areas compared with typically developing matched groups. Conclusions It is proposed that children with ASD attend to the images in a manner that does not differentiate them from typically developing individuals. Therefore children with and without autism have the same opportunity to encode the available information. We discuss what this may imply for interventions using picture symbols

Validity and Reliability of Electronic Devices to Measure Muscular Power during Linear Weight Lifting Movements

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Iodine deficiency in pregnant women in the ACT

In response to growing concern of an iodine deficiency emergence in Australia, this study was conducted to document the iodine status of pregnant women in the ACT. One hundred women presenting to the antenatal clinic at The Canberra Hospital answered a brief dietary questionnaire and provided a spot urine sample for the measurement of urine iodine excretion. The results revealed that the majority of women were consuming a diet low in iodine, confirmed by suboptimal concentrations of iodine in their urine

Dynamical frictional phenomena in an incommensurate two-chain model

Dynamical frictional phenomena are studied theoretically in a two-chain model with incommensurate structure. A perturbation theory with respect to the interchain interaction reveals the contributions from phonons excited in each chain to the kinetic frictional force. The validity of the theory is verified in the case of weak interaction by comparing with numerical simulation. The velocity and the interchain interaction dependences of the lattice structure are also investigated. It is shown that peculiar breaking of analyticity states appear, which is characteristic to the two-chain model. The range of the parameters in which the two-chain model is reduced to the Frenkel-Kontorova model is also discussed.Comment: RevTex, 9 pages, 7 PostScript figures, to appear in Phys. Rev.