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N Magnani

Publications and source records attributed to N Magnani.

6 recordsLinked to original sources
PubMed2006

Hidden order and low-energy excitations in NpO2.

We investigate the nature of the hidden order parameter in the ordered phase of NpO2, which had been identified with a staggered arrangement of Gamma5 magnetic multipoles. By analyzing the existing experimental data, we show that the most likely driving order parameter is not provided by octupoles, as usually assumed, but rather by the rank-5 triakontadipoles. Calculations of the coupled dynamics of spins, Gamma5 quadrupoles, and Gamma5 triakontadipoles in the ordered phase enable us to analyze the resulting structure of low-energy excitations. We show that the powder inelastic neutron scattering cross section should contain, in addition to the already-observed peak at 6.5 meV, a second weaker peak at about 14 meV.

Journal Article↗
PubMed2004

S mixing and quantum tunneling of the magnetization in molecular nanomagnets.

The role of S mixing in the quantum tunneling of the magnetization in nanomagnets has been investigated. We show that the effect on the tunneling frequency is huge and that the discrepancy (more than 3 orders of magnitude in the tunneling frequency) between spectroscopic and relaxation measurements in Fe(8) can be resolved if S mixing is taken into account.

Journal Article↗
PubMed1996

[Various personality traits of patients with psoriatic arthropathy].

It is well known that patients affected by rheumatic diseases may present specific pathological trends in personality structure, as has been extensively reported in literature. Our study was aimed at investigating several aspects of the personality traits of 20 patients with psoriatic arthropathy, compared with a group of 20 patients with rheumatoid arthritis. All patients were evaluated with appropriate rating scales assigned in auto and hetero-administration. The study results points to a personality trait disturbance in psoriatic arthritis patients, which can be clearly differentiated from the anxious habitus and/or reactive-depressive state observed in patients with rheumatoid arthritis.

Adult↗
PubMed1988

[Not Available].

Explore the source record for details and available documents.

History, Modern 1601-↗
PubMedDate not supplied

[The McCollough effect and visual fatigue induced by the use of green phosphorus monochromatic video terminals].

We examined 101 students (40 men, 61 women) aged 16-19 years, working 1-3 hours daily with video display terminals (VDT) with luminous green characters on dark background. McCollough visual aftereffect (ME) was reported, almost occasionally, in 80.2% of the examined group. 68% of the students referred daily ME appearance. Usually the effect appeared after 1 hour or less of VDT work and might persist for 1 hour or more. ME prevalence and persistence were significantly greater in women than in men. Apparently no relations were observed between ME prevalence and VDT work hours of visual defects. ME prevalence and persistence were significantly related to VDT induced visual asthenopia symptoms, but not with ocular asthenopia. According to our results, ME appearance may represent an early index of individual susceptibility to visual asthenopia induced by green characters VDT and/or be itself a precocious visual asthenopia symptom.

Adolescent↗