2,726 research outputs found
Cohort Profile: The Zurich Project on the Social Development from Childhood to Adulthood (z-proso)
The Zurich Project on the Social Development from Childhood to Adulthood (z-proso) began in 2004 in response to the need for a better evidence base to support optimal child social development and prevent crime and violence. Since then, the study has tracked the development of a diverse sample of youths (N = 1,675 in the target sample; ~50% female) from age 7 (n = 1,360) to age 20 (n = 1,180), with primary data collection waves at ages 7, 8, 9, 10, 11, 12, 13, 15, 17, and 20. The study uses a multi-method, multi-informant design that combines teacher, youth, and parent reports with observational and behavioural measures, biosampling, functional imaging, and ecological momentary assessment. Analyses of the data have contributed important evidence to a diversity of topics in child and adolescent development, illuminating the developmental roots of crime and aggression, the impacts of exposure to different forms and combinations of victimisation, and trajectories of mental health and neurodevelopmental symptoms
Modeling Wind-Driven Circulation in Lake Balaton
This paper reports the results achieved to date in a program of research to develop and apply mathematical computer models of water quality in shallow lakes. The portion of the research which is the specific topic of this paper is the development, testing and trial application of a transient three-dimensional model of wind-driven circulation. The results are presented in the context of an application to Lake Balaton in Hungary, a large yet very shallow lake.
The paper presents a review of the mathematical formulation of the circulation problem and the major methods used in computer models of wind-driven circulation. Detailed examinations of the model assumptions and parameters are also included. A description of the application lake follows and a three-dimensional model appropriate to shallow lakes is proposed and derived. This model is examined for consistency with Lake Balaton's characteristics, and the important need for congruence with an eventual coupled biogeochemical model of the water quality is described and investigated. The requirement that the length and time scales of the hydrodynamic model and the biogeochemical model be consistent with each other and with the processes of interest in the lake is stressed.
The proposed circulation model employs a Galerkin technique to compute the vertical velocity profile using a depth-dependent vertical eddy viscosity. The parameters for this model are determined by calibration using simple hypothetical seiche simulations as a standard. It is found that the function specified for the vertical eddy viscosity is a crucial determinant of the model response. The resulting model and calibration are then successfully verified with historical events on Lake Balaton. A detailed examination of the results of one of these event simulations explores aspects of the model predictions pertinent to the mass transport of water quality constituents. Conclusions of the paper include identification of the need to improve the representation of mass transport in existing models of Balaton's water quality and an agenda for future development of a coupled hydrodynamic-biogeochemical water quality model
The Role of Lattice QCD in Searches for Violations of Fundamental Symmetries and Signals for New Physics
This document is one of a series of whitepapers from the USQCD collaboration.
Here, we discuss opportunities for Lattice Quantum Chromodynamics (LQCD) in the
research frontier in fundamental symmetries and signals for new physics. LQCD,
in synergy with effective field theories and nuclear many-body studies,
provides theoretical support to ongoing and planned experimental programs in
searches for electric dipole moments of the nucleon, nuclei and atoms, decay of
the proton, - oscillations, neutrinoless double- decay
of a nucleus, conversion of muon to electron, precision measurements of weak
decays of the nucleon and of nuclei, precision isotope-shift spectroscopy, as
well as direct dark matter detection experiments using nuclear targets. This
whitepaper details the objectives of the LQCD program in the area of
Fundamental Symmetries within the USQCD collaboration, identifies priorities
that can be addressed within the next five years, and elaborates on the areas
that will likely demand a high degree of innovation in both numerical and
analytical frontiers of the LQCD research.Comment: A whitepaper by the USQCD Collaboration, 30 pages, 9 figure
The Deformation of an Elastic Substrate by a Three-Phase Contact Line
Young's classic analysis of the equilibrium of a three-phase contact line
ignores the out-of-plane component of the liquid-vapor surface tension. While
it has long been appreciated that this unresolved force must be balanced by
elastic deformation of the solid substrate, a definitive analysis has remained
elusive because conventional idealizations of the substrate imply a divergence
of stress at the contact line. While a number of theories of have been
presented to cut off the divergence, none of them have provided reasonable
agreement with experimental data. We measure surface and bulk deformation of a
thin elastic film near a three-phase contact line using fluorescence confocal
microscopy. The out-of-plane deformation is well fit by a linear elastic theory
incorporating an out-of-plane restoring force due to the surface tension of the
gel. This theory predicts that the deformation profile near the contact line is
scale-free and independent of the substrate elastic modulus.Comment: 4 pages, 3 figure
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The Interaction of Dissolved H with Internally Oxidized Pd-Rh Alloys
Binary Pd-M alloys containing small amounts of readily oxidizable solute metals such as M equals Al, Mg, or Zr, can be internally oxidized to form essentially pure Pd matrices containing a second phase of nano-sized oxide precipitates. During internal oxidation Pd atoms are transported to the surface forming Pd nodules while vacancies are transported from the surface to the metal/oxide interface relieving the compressive stress which develops within the alloy due to the expanding metal oxide precipitates. The Pd alloys that have been studied contain that form very stable oxides
SU(3) breaking in hyperon transition vector form factors
We present a calculation of the SU(3)-breaking corrections to the hyperon
transition vector form factors to in heavy baryon chiral
perturbation theory with finite-range regularisation. Both octet and decuplet
degrees of freedom are included. We formulate a chiral expansion at the
kinematic point , which can be conveniently accessed
in lattice QCD. The two unknown low-energy constants at this point are
constrained by lattice QCD simulation results for the
and transition form factors. Hence we determine
lattice-informed values of at the physical point. This work constitutes
progress towards the precise determination of from hyperon
semileptonic decays
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