1,371 research outputs found
Follow-up study of over three years of patients with uveitis after cataract phacoemulsification: outcomes and complications
Purpose: To evaluate the rate and onset of intraoperative and postoperative complications post-phacoemulsification.
Methods: One hundred sixty-two eyes of 145 patients with uveitis who underwent phacoemulsification
between 2006 and 2009 were identified through surgical record review. Fifty-nine eyes of 46 patients met
the inclusion criteria. Hazard ratio (HR) and Kaplan-Meier survival probability were calculated for each class
of uveitis. Results: Macular edema (ME) resulted to be associated to chronic postoperative inflammation
(r = 0.6; p = 0.00) and mostly related to patients who presented more than one postoperative relapse/year (r = 0.2;
p = 0.02). Fuchs uveitis resulted to be a risk factor for posterior capsule opacification (PCO) (HR 3.36
IC95%1.0-10.5; p = 0.03). Hypotony and elevated intraocular pressure (IOP) were detected in the anterior uveitis
group (0.02 EY). Conclusion: The HR to develop ME was significantly related to chronic anterior uveitis. PCO
and elevated IOP are
Thermal expansion and effect of pressure on superconductivity in CuxTiSe2
We report measurements of thermal expansion on a number of polycrystalline
CuxTiSe2 samples corresponding to the parts of x - T phase diagram with
different ground states, as well as the pressure dependence of the
superconducting transition temperature for samples with three different values
of Cu-doping. Thermal expansion data suggest that the x - T phase diagram may
be more complex than initially reported. T_c data at elevated pressure can be
scaled to the ambient pressure CuxTiSe2 phase diagram, however, significantly
different scaling factors are needed to accommodate the literature data on the
charge density wave transition suppression under pressure
Coping strategies against peer victimization: differences according to gender, grade, victimization status and perceived classroom social climate
The Sustainable Development Goals (SDGs) include “Good Health and Well-being” (SDG3) and “Quality Education” (SDG4). Nevertheless, many students cannot achieve these goals if they suffer peer victimization at their schools, and intervention programs to reduce it are necessary. These programs should consider the possible differences in the coping strategies preferred by students according to some personal (e.g., gender, grade, victimization status) and contextual (e.g., perceived classroom social climate) factors to be more effective. Therefore, the objective of this study was to analyze the possible differences in the coping strategies preferred by students (ask a friend for help, ask a teacher for help, ask parents for help, not ask anyone for help, fighting back, avoid the aggressor and ask the aggressor why) to handle situations of relational, physical and verbal peer victimization according to their gender, school grade, victimization status and perceived classroom social climate. The sample comprised 479 students (52.2% boys, 47.8% girls) aged from 9 to 14 years (M = 11.21, SD = 1.52). The results showed that girls chose the strategies of asking friends or adults for help and asking the aggressor why more than boys, while boys chose the strategies of fighting back and not ask anyone for help more than girls. The coping strategy of asking a teacher for help was preferred more by students of lower school grades and by students with a positive perception of the classroom climate. Victimized students preferred the strategy of not asking anyone for help. These results may be useful for developing more effective intervention programs. These programs should aim to enhance the teacher–student relationship in upper school grades, help victimized students to inform about peer aggression situations and improve perceived classroom social climate
Possible quadrupolar nematic phase in the frustrated spin chain LiCuSbO: an NMR investigation
The frustrated one-dimensional (1D) quantum magnet LiCuSbO is one rare
realization of the spin chain model with an easily accessible
saturation field, formerly estimated to 12~T. Exotic multipolar nematic phases
were theoretically predicted in such compounds just below the saturation field,
but without unambiguous experimental observation so far. In this paper we
present extensive experimental research of the compound in the wide temperature
(30mK300K) and field (013.3T) range by muon spin rotation (SR),
Li nuclear magnetic resonance (NMR) and magnetic susceptibility (SQUID).
SR experiments in zero magnetic field demonstrate the absence of long
range 3D ordering down to 30mK. Together with former heat capacity data [S.E.
Dutton \emph{et al}, Phys. Rev. Lett. 108, 187206 (2012)], magnetic
susceptibility measurements suggest short range correlated vector chiral phase
in the field range T. In the intermediate field values (512T), the
system enters in a 3D ordered spin density wave phase with 0.75 per
copper site at lowest temperatures (125mK), estimated by NMR. At still higher
field, the magnetization is found to be saturated above 13T where the spin
lattice relaxation reveals a spin gap estimated to 3.2(2)K. We
narrow down the possibility of observing a multipolar nematic phase to the
range 12.513T.Comment: 12 pages, 15 figure
Superconductivity in Mg10Ir19B16
Mg10Ir19B16, a previously unreported compound in the Mg-Ir-B chemical system,
is found to be superconducting at temperatures near 5 K. The fact that the
compound exhibits a range of superconducting temperatures between 4 and 5 K
suggests that a range of stoichiometries is allowed, though no structural
evidence for this is observed. The compound has a large, noncentrosymmetric,
body centered cubic unit cell with a = 10.568 Angstrom, displaying a structure
type for which no previous superconductors have been reported.Comment: submitted to PR
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