Search results for "FOS"
showing 10 items of 15075 documents
New high-pressure phase and equation of state of Ce2Zr2O8
2012
In this paper we report a new high-pressure rhombohedral phase of Ce2Zr2O8 observed from high-pressure angle-dispersive x-ray diffraction and Raman spectroscopy studies up to nearly 12 GPa. The ambient-pressure cubic phase of Ce2Zr2O8 transforms to a rhombohedral structure beyond 5 GPa with a feeble distortion in the lattice. Pressure evolution of unit-cell volume showed a change in compressibility above 5 GPa. The unit-cell parameters of the high-pressure rhombohedral phase at 12.1 GPa are ah = 14.6791(3) {\AA}, ch = 17.9421(5) {\AA}, V = 3348.1(1) {\AA}3. The structure relation between the parent cubic (P2_13) and rhombohedral (P3_2) phases were obtained by group-subgroup relations. All t…
Prioritizing covariates in the planning of future studies in the meta-analytic framework
2016
Science can be seen as a sequential process where each new study augments evidence to the existing knowledge. To have the best prospects to make an impact in this process, a new study should be designed optimally taking into account the previous studies and other prior information. We propose a formal approach for the covariate prioritization, i.e., the decision about the covariates to be measured in a new study. The decision criteria can be based on conditional power, change of the p-value, change in lower confidence limit, Kullback-Leibler divergence, Bayes factors, Bayesian false discovery rate or difference between prior and posterior expectation. The criteria can be also used for decis…
Youth aging out of foster care in Poland: Preliminary evaluation results from a pilot prevention program
2012
The aim of this study was to provide results of a preliminary evaluation of the BRIGE (Building Resilience through Intervention, Guidance, and Empowerment) prevention program. The program was designed for youths aging out of the foster care system in Poland and starting independent life. Prior research by our research team documented that these youth are at high risk for homelessness, mental health problems, and other poor outcomes in the years after exiting foster care. Research participants were the first 5 youths who entered the BRIGE program (in fall 2009). All were preparing to leave orphanages in Poland. Each youth was appointed a case manager who worked with the youth over a period o…
Quasiconformal Jordan Domains
2020
We extend the classical Carath\'eodory extension theorem to quasiconformal Jordan domains $( Y, d_{Y} )$. We say that a metric space $( Y, d_{Y} )$ is a quasiconformal Jordan domain if the completion $\overline{Y}$ of $( Y, d_{Y} )$ has finite Hausdorff $2$-measure, the boundary $\partial Y = \overline{Y} \setminus Y$ is homeomorphic to $\mathbb{S}^{1}$, and there exists a homeomorphism $\phi \colon \mathbb{D} \rightarrow ( Y, d_{Y} )$ that is quasiconformal in the geometric sense. We show that $\phi$ has a continuous, monotone, and surjective extension $\Phi \colon \overline{ \mathbb{D} } \rightarrow \overline{ Y }$. This result is best possible in this generality. In addition, we find a n…
Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements
2019
We report the first measurement of the $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The measurement covered a missing momentum range of $40 \le p_{miss} \le 550$ MeV$/c$, at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) and $x_B>1$, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for $^3$He$/d$ and $^3$H$/d$ extend to just above the typical nucleon Fermi-momentum ($k_F \approx 250$ …
Program pomocy BRIGE dla młodzieży z opieki zastępczej
2016
Osoby wychowywane poza rodziną własną, w opiece zastępczej, są szczególnie narażone na doświadczanie trudności życiowych oraz zagrożone wykluczeniem społecznym. Badania nad młodzieżą opuszczającą opiekę zastępczą prowadzone w Europie i Stanach Zjednoczonych pokazują, że osoby te doświadczają wielu problemów w różnych obszarach funkcjonowania. Są to symptomy zaburzeń psychicznych, zachowania antyspołeczne, ryzykowne zachowania seksualne, nadużywanie substancji psychoaktywnych i wiktymizacja. W związku z trudną sytuacją tej grupy młodzieży zespół badaczy z Uniwersytetu Opolskiego dokonał adaptacji do warunków polskich amerykańskiego programu pomocy dla osób opuszczających opiekę zastępczą. Pr…
Cinètiques i mecanismes de la degradació atmosfèrica d'alguns pesticides
2016
Els plaguicides són amplament emprats actualment tant en agricultura com en usos domèstics o en industria. Tot i aportar importants beneficis a la societat actual, tant en temes relacionats amb la salut com amb l’economia, el seu ús també implica un riscos que s’han de conèixer. Un cop s’aplica un plaguicida, aquest es distribuirà entre els distints compartiments mediambientals –sòl, aigua i atmosfera- segons les seues propietats físico-químiques i el mode d’aplicació. L’atmosfera és un important medi de transport i reserva per als plaguicides i els seus productes de degradació. A l’arribar a l’atmosfera, el plaguicida es distribuirà entre les distintes fases aquosa, gasosa o particulada se…
Simultaneous measurement of β-delayed proton and γ decay of 27P
2016
This is the first study of 27P to measure both the β-delayed proton and β-delayed γ decays. While no new proton groups in the astrophysically interesting energy region of 300–400 keV were observed, a new upper limit on the proton branching of 0.16% was estimated. Several new γ -ray lines were observed, mainly coming from the isobaric analog state in 27Si, which has been assigned a more accurate energy value of 6638(1) keV. peerReviewed
Cubic color charge correlator in a proton made of three quarks and a gluon
2022
The three point correlation function of color charge densities is evaluated explicitly in light cone gauge for a proton on the light cone. This includes both $C$-conjugation even and odd contributions. We account for perturbative corrections to the three-quark light cone wave function due to the emission of an internal gluon which is not required to be soft. We verify the Ward identity as well as the cancellation of UV divergences in the sum of all diagrams so that the correlator is independent of the renormalization scale. It does, however, exhibit the well known soft and collinear singularities. The expressions derived here provide the $C$-odd contribution to the initial conditions for hi…
Stronger C -odd color charge correlations in the proton at higher energy
2023
The non-forward eikonal scattering matrix for dipole-proton scattering at high energy obtains an imaginary part due to a $C$-odd three gluon exchange. We present numerical estimates for the perturbative Odderon amplitude as a function of dipole size, impact parameter, their relative azimuthal angle, and light-cone momentum cutoff $x$. The proton is approximated as $\psi_\mathrm{qqq}|qqq\rangle + \psi_\mathrm{qqqg}|qqqg\rangle$, where $\psi_\mathrm{qqq}$ is a non-perturbative three quark model wave function while the gluon emission is computed in light-cone perturbation theory. We find that the Odderon amplitude increases as $x$ decreases from 0.1 to 0.01. At yet lower $x$, the reversal of t…