Longitudinal and Transverse Form Factors from 12^{12}C

Electron scattering form factors from $^{12}$C have been studied in the framework of the particle-hole shell model. Higher configurations are taken into account by allowing particle-hole excitations from the 1$s$ and 1$p$ shells core orbits up to the 1$f-2p$ shell. The inclusion of the higher configurations modifies the form factors markedly and describes the experimental data very well in all momentum transfer regions.Comment: 5 pages, 5 figures, 3 tables, late

The effect of core polarization on longitudinal form factors in 10^{10}B

Electron scattering Coulomb form factors for the single-particle quadrupole transitions in $p$-shell $^{10}$B nucleus have been studied. Core polarization effects are included through a microscopic theory that includes excitations from the core orbits up to higher orbits with 2$\hbar$$\omega$ excitations. The modified surface delta interaction (MSDI) is employed as a residual interaction. The effect of core polarization is found essential in both the transition strengths and momentum transfer dependence of form factors, and gives a remarkably good agreement with the measured data with no adjustable parameters.Comment: 4 pages, 5 figure

Full fpfp-shell study of even-even 48−56^{48-56}Ti isotopes

The level schemes and transition rates {\em B}({\em E}2;$\uparrow$) of eve-even $^{48-56}$Ti isotopes were studied by performing large-scale shell model calculations with FPD6 and GXPF1 effective interactions. Excellent agreement were obtained by comparing the first 2$^{+}$ level for all isotopes with the recently available experimental data, but studying the transition strengths {\em B}({\em E}2; 0$^+_{g.s.} \to2^+_1$) for all Ti isotopes using constant proton-neutron effective charges prove the limitations of the present large-scale calculations to reproduce the experiment in detail.Comment: 4 pages, 4 figure

Quality of care in University Hospitals in Saudi Arabia: systematic review

Objectives: To identify the key issues, problems, barriers and challenges particularly in relation to the quality of care in university hospitals in the Kingdom of Saudi Arabia (KSA), and to provide recommendations for improvement. Methods: A systematic search was carried out using five electronic databases, for articles published between January 2004 and January 2015. We included studies conducted in university hospitals in KSA that focused on the quality of healthcare. Three independent reviewers verified that the studies met the inclusion criteria, assessed the quality of the studies and extracted their relevant characteristics. All studies were assessed using the Institute of Medicine indicators of quality of care. Results: Of the 1430 references identified in the initial search, eight studies were identified that met the inclusion criteria. The included studies clearly highlight a need to improve the quality of healthcare delivery, specifically in areas of patient safety, clinical effectiveness and patient-centredness, at university hospitals in KSA. Problems with quality of care could be due to failures of leadership, a requirement for better management and a need to establish a culture of safety alongside leadership reform in university hospitals. Lack of instructions given to patients and language communication were key factors impeding optimum delivery of patient-centred care. Decisionmakers in KSA university hospitals should consider programmes and assessment tools to reveal problems and issues related to language as a barrier to quality of care. Conclusions: This review exemplifies the need for further improvement in the quality of healthcare in university hospitals in KSA. Many of the problems identified in this review could be addressed by establishing an independent body in KSA, which could monitor healthcare services and push for improvements in efficiency and quality of care

Dipole and Quadrupole electroexcitations of the isovector T=1 particle-hole states in C-12

Electroexcitations of the dominantly T=1 particle-hole states of C-12 are studied in the framework of the harmonic oscillator shell model. All possible T=1 single-particle-hole states of all allowed angular momenta are considered in a basis including single-particle states up to the 1f-2p shell. The Hamiltonian is diagnoalized in this space in the presence of the modified surface delta interaction. Correlation in the ground state wave functions by mixing more than one configuration is considered and shows a major contribution that leads to enhance the calculations of the form factors. A comparison with the experiment shows that this model is able to fit the location of states and a simple scaling of the results give a good fit to the experimental form factors.Comment: 5 pages, 4 figures, 5 tables, Late

Concepto de aristas múltiples empleado para esteganografía de imagen

Digital Steganography means hiding sensitive data inside a cover object ina way that is invisible to un-authorized persons. Many proposed steganography techniques in spatial domain may achieve high invisibility requirement but sacrifice the good robustness against attacks. In some cases, weneed to take in account not just the invisibility but also we need to thinkabout other requirement which is the robustness of recovering the embedded secrete messages. In this paper we propose a new steganoraphicscheme that aims to achieve the robustness even the stego image attackedby steganalyzers. Furthermore, we proposed a scheme which is more robust against JPEG compression attack compared with other traditionalsteganography schemes

Risk of Covid-19 in shielded and nursing care home patients: cohort study in general practice

Background: Covid-19 cases were first detected in the UK in January 2020 and vulnerable patients were asked to shield from March to reduce their risk of Covid-19 infection. Aim: To determine the risk and determinants of Covid-19 diagnosis in shielded vs. non-shielded groups adjusted for key comorbidities not explained by shielding. Design: Retrospective cohort study of adults with COVID-19 infection between 1/2/20-15/5/20 in West London. Method: Individuals diagnosed with Covid-19 were identified in SystmOne records using clinical codes. Infection risks were adjusted for socio-demographic factors, nursing home status and comorbidities. Results: Of 57,713 adults, 573 (1%) individuals were identified as shielded and 1,074 adults had documented Covid-19 infections (1.9%). Covid-19 infection rate in the shielded group individuals compared with non-shielded adult individuals was 6.5 % (37/573) vs. 1.8 % (1,037/57, 140), p30kg/m2) 1.39 (1.18-1.63) p<0.001, and age 1.02 (1.01-1.02) p<0.001. Male gender was associated with lower risk of Covid-19 infection: 0.71 (0.62-0.82) p<0.001. Conclusion: Shielded individuals had a higher Covid-19 infection rate compared with non-shielded individuals, after adjusting for socio-demographic factors, nursing home status, and comorbidities