Publish in OALib Journal
APC: Only $99
In this paper we
discuss two measures for the quantumness of correlations (quantum discord and
entanglement) of two isolated moving atoms which are initially in Werner state.
We compare and analyze the effect of the atomic motion in quantum discord and
entanglement. The results show that the atomic motion related to the field mode
structure parameter can make the entanglement and quantum discord evolve
periodically. The results also indicate that the entanglement suddenly disappears
during the evaluation but quantum discord remains non zero, so quantum discord
is considered as indicator of disentanglement.
We investigate the quantum discord of a two-qubit anisotropy XXZ Heisenberg chain with Dzyaloshinskii-Moriya (DM) interaction under magnetic field. It is shown that the quantum discord highly depends on the system’s temperature T, DM interaction D, homogenous magnetic field B and the anisotropy Δ. For lower temperature T, by modulating D and B, the quantum discord can be controlled and the quantum discord switch can be realized.
Objectives: Acne is a common skin disease especially in adolescents and young adults. Several pathogenetic factors are implicated in causing the disease. Typically acne flares and remits in its course. Several factors can cause flares. The aim of this study was to assess the perceived factors of acne flares and the idea of sun creams causing skin darkening. Methods: A questionnaire study of the perceived factors in causing acne flares was studied in university female students. These included food, stress, hygiene and menstrual periods. In addition, the effect of sun creams on causing skin darkening was asked. Results: Food was implicated by 43.2% of patients. Stress and menstrual periods were thought to exacerbate acne by more than 70% of patients while 80% of patients did not think bad hygiene worsened acne. 40% of patients thought the use of sun creams cause skin darkening. Conclusion: More controlled studies are needed to explore the effect of food on acne. Dermatologists need to explain the benefit of using sun creams especially to acne patients while using standard treatments.
Soil salinity is a serious environmental problem especially in arid
and semiarid areas. It either occurs naturally or is human-induced. High levels
of soil salinity negatively affect crop growth and productivity leading land
degradation ultimately. Thus, it is important to monitor and map soil salinity
at an early stage to enact effective soil reclamation program that helps lessen
or prevent future increase in soil salinity. Remote sensing has outperformed
the traditional method for assessing soil salinity offering more informative
and professional rapid assessment techniques for monitoring and mapping soil
salinity. Soil salinity
can be identified from remote sensing data obtained by different sensors by way
of direct indicators that refer to salt features that are visible at the soil
surface as well as indirect indicators such as the presence of halophytic plant
and assessing the performance level of salt-tolerant crops. The purposes of this paper are to 1) discuss some soil salinity indicators;
2) review the satellite sensors and methods used for remote monitoring, detecting
and mapping of soil salinity, particularly in arid and semi-arid regions; 3)
review various spectral
vegetation and salinity indices that have been developed and proposed for soil
salinity detection and mapping, with an emphasis on soil salinity
mapping and assessment in arid and semi-arid regions;
and 4) highlight the most important issues limiting the use of remote sensing
for soil salinity mapping, particularly in arid and semi-arid regions.