755 research outputs found
Do peers increase older adults\u27 participation in strength training? Pilot randomized trial
Fewer than 20% of older adults participate in strength training (ST). Barriers to ST participation include not knowing where to go or not having someone to go with. To address these barriers, the authors provided older adults with a peer (older person already participating in ST) to support their engagement. The aim of this pilot randomized controlled trial was to determine whether older adults who were provided with a peer when participating in ST were more likely to be participating in ST 4 weeks postintervention, compared with those receiving ST alone. Fifty-one ST participants were recruited; 40 completed the intervention and postintervention data collection (78.4%). Providing peer support with ST did not significantly increase ST participation (pâ=â.775). However, both groups made significant improvements over time in lower-limb strength and mobility. Participants in either group who continued the ST program (55%) had made additional significant improvements in lower-limb strength and mobility
Semiclassical treatment of fusion processes in collisions of weakly bound nuclei
We describe a semiclassical treatment of nuclear fusion reactions involving
weakly bound nuclei. In this treatment, the complete fusion probabilities are
approximated by products of two factors: a tunneling probability and the
probability that the system is in its ground state at the strong absorption
radius. We investigate the validity of the method in a schematic two-channel
application, where the channels in the continuum are represented by a single
resonant state. Comparisons with full coupled-channels calculations are
performed. The agreement between semiclassical and quantal calculations isquite
good, suggesting that the procedure may be extended to more sophisticated
discretizations of the continuum.Comment: 11 pages, 5 figure
Limitation of energy deposition in classical N body dynamics
Energy transfers in collisions between classical clusters are studied with
Classical N Body Dynamics calculations for different entrance channels. It is
shown that the energy per particle transferred to thermalised classical
clusters does not exceed the energy of the least bound particle in the cluster
in its ``ground state''. This limitation is observed during the whole time of
the collision, except for the heaviest system.Comment: 13 pages, 15 figures, 1 tabl
FPGA based data acquisition system for COMPASS experiment
This paper discusses the present data acquisition system (DAQ) of the COMPASS
experiment at CERN and presents development of a new DAQ. The new DAQ must
preserve present data format and be able to communicate with FPGA cards. Parts
of the new DAQ are based on state machines and they are implemented in C++ with
usage of the QT framework, the DIM library, and the IPBus technology. Prototype
of the system is prepared and communication through DIM between parts was
tested. An implementation of the IPBus technology was prepared and tested. The
new DAQ proved to be able to fulfill requirements.Comment: 8 pages, CHEP 201
Governance under common ownership
Conventional wisdom is that diversification weakens governance by spreading an investor too thinly. We show that, when an investor owns multiple firms (âcommon ownershipâ), governance through both voice and exit can strengthen â even if the firms are in unrelated industries. Under common ownership, an informed investor has flexibility over which assets to retain and which to sell. She sells low-quality firms first, thereby increasing price informativeness. In a voice model, the investorâs incentives to monitor are stronger since âcutting-and-runningâ is less profitable. In an exit model, the managerâs incentives to work are stronger since the price impact of investor selling is greater
Coherent optical control of correlation waves of spins in semiconductors
We calculate the dynamical fluctuation spectrum of electronic spins in a
semiconductor under a steady-state illumination by light containing
polarization squeezing correlations. Taking into account quasi-particle
lifetime and spin relaxation for this non-equilibrium situation we consider up
to fourth order optical effects which are sensitive to the squeezing phases.
We demonstrate the possibility to control the spin fluctuations by optically
modulating these phases as a function of frequency, leading to a non-Lorentzian
spectrum which is very different from the thermal equilibrium fluctuations in
n-doped semiconductors. Specifically, in the time-domain spin-spin correlation
can exhibit time delays and sign flips originating from the phase modulations
and correlations of polarizations, respectively. For higher light intensity we
expect a regime where the squeezing correlations will dominate the spectrum.Comment: 17 pages, 8 figure
V.I. Vernadsky and the noosphere concept: Russian understandings of society-nature interaction
Recent Russian legislative and policy documentation concerning national progress towards sustainable development has suggested that the attainment of such a state would represent the first stage in the development of the noosphere as outlined by the Russian scientist Vladimir Ivanovich Vernadsky (1863â1945). This paper explores Vernadskyâs model of evolutionary change through a focus on his work on the biosphere and noosphere in an attempt to further understanding of the way in which Russia is approaching the concept of sustainable development in the contemporary period. It is argued that the official Russian interpretation of the noosphere idea tends to obscure the evolutionary and materialist foundations of Vernadskyâs biosphereânoosphere conceptualisation. At the same time, the concluding section of the paper suggests that the scope of Vernadskyâs work can be used to stimulate the search for a more coherent approach to work in areas of sustainable development and sustainability across the span of the social and physical sciences
The effects of interstitial content and annealing on the flow and fracture behavior on polycrystalline beta-NiAl
The strain behavior of three polycrystalline NiAl alloys has been investigated at temperatures between 300 and 1200 K. Yield stress plateaus, yield stress transients upon a ten-fold increase in strain rate, work hardening peaks, and dips in the strain rate sensitivity (SRS) have been observed between 700 and 800 K. These observations are indicative of dynamic strain aging (DSA) and are discussed in terms of conventional strain aging theories
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The Debt Limit: History and Recent Increases
This report discusses how the total debt of the federal government can increase, an historical overview of debt limits, and how the current economic slowdown has led to higher deficits and thereby a series of debt limit increases, as well as legislation related to these increases
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Mandatory Spending Since 1962
Mandatory spending includes federal government spending on entitlement programs as well as other budget outlays controlled by laws other than appropriation acts. Entitlement programs such as Social Security and Medicare make up the bulk of mandatory spending. This report looks at mandatory spending and how it has grown over time relative to total federal spending and the size of the U.S. economy. It also analyzes future mandatory spending levels and how they are projected to impact the federal budget
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