6,931 research outputs found
An improved computational procedure for determining helicopter rotor blade natural modes
An existing computer program, used for predicting the natural frequencies and mode shapes of helicopter rotor blades, was refined to improve program accuracy and versatility. The program is based on the Holzer-Myklestad approach adapted for rotating beams. Coupled vertical (out-of-plane), horizontal (in-plane), and torsional mode characteristics were determined for a variety of hub and blade configurations. The resulting program is documented by presenting the recursion equations and techniques for determining natural frequencies and mode shapes, input data requirements, and descriptions of various program outputs. The accuracy of the program is demonstrated by comparing computed results with exact solutions to classical problems and experimental data
Magnetic properties of PrCu at high pressure
We report a study of the low-temperature high-pressure phase diagram of the
intermetallic compound PrCu, by means of molecular-field calculations and
Cu nuclear-quadrupole-resonance (NQR) measurements under pressure.
The pressure-induced magnetically-ordered phase can be accounted for by
considering the influence of the crystal electric field on the electron
orbitals of the Pr ions and by introducing a pressure-dependent exchange
interaction between the corresponding local magnetic moments. Our experimental
data suggest that the order in the induced antiferromagnetic phase is
incommensurate. The role of magnetic fluctuations both at high and low
pressures is also discussed.Comment: 7 pages, 6 figures, submitted to Eur. Phys. J.
Organisational involvement in supporting the learned professional.
This paper describes the Doctorate in Professional Studies (DProf) as developed at a UK University and specifically focuses on the specialist doctoral pathways in Health, Environment and Risk in the School of Health and Social Sciences. The paper considers the role of the major stakeholders; Doctoral candidate, Employer Organisation hosting the research, and the University. Since the inception of the DProf there has been recognition of the need for the employer organisation to be an active partner in the research by supporting it through being receptive to the emerging research findings. There is also recognition of the differences between traditional doctoral study and that of the work based professional doctoral candidate. Portwood (2000) considered the concept of the learned worker as the person who is able to develop a reflective and cognisant view of organisational developments and change. Armsby and Costley (2009) took the learned worker concept further by considering the potential risks and barriers encountered through the âsituatednessâ of the professional doctoral candidate in the organisation, and ultimately their vulnerability should there be internal resistance or apathy towards the research. The paper considers two examples of such resistance and analyses the support required for the learned professional doctoral candidate through utilising the resources of âorganisation sapiensâ. Recommendations are made on strategy for leading the change process and understanding positive and constructive approaches to questioning organisational change. The paper concludes with a consideration of a more inclusive and participatory approach to organisation stakeholder involvement and potential methodologies that may enable greater partnership in the research
âI wish Iâd told themâ: a qualitative study examining the unmet psychosexual needs of prostate cancer patients during follow-up after treatment
<b>Objective</b> To gain insight into patients' experiences of follow-up care after treatment for prostate cancer and identify unmet psychosexual needs.<p></p>
<b>Methods</b> Semi-structured interviews were conducted with a purposive sample of 35 patients aged 59-82 from three UK regions. Partners were included in 18 interviews. Data were analyzed using constant comparison. <p></p>
<b>Results</b> (1) Psychosexual problems gained importance over time, (2) men felt they were rarely invited to discuss psychosexual side effects within follow-up appointments and lack of rapport with health care professionals made it difficult to raise problems themselves, (3) problems were sometimes concealed or accepted and professionals' attempts to explore potential difficulties were resisted by some, and (4) older patients were too embarrassed to raise psychosexual concerns as they felt they would be considered 'too old' to be worried about the loss of sexual function.<p></p>
<b>Conclusion</b> Men with prostate cancer, even the very elderly, have psychosexual issues for variable times after diagnosis. These are not currently always addressed at the appropriate time for the patient.Practice implications Assessments of psychosexual problems should take place throughout the follow-up period, and not only at the time of initial treatment. Further research examining greater willingness or reluctance to engage with psychosexual interventions may be particularly helpful in designing future intervention
Deuteron Compton Scattering in Effective Field Theory: Spin-Dependent Cross Sections and Asymmetries
Polarized Compton scattering on the deuteron is studied in nuclear effective
field theory. A set of tensor structures is introduced to define 12 independent
Compton amplitudes. The scalar and vector amplitudes are calculated up to
in low-energy power counting. Significant
contribution to the vector amplitudes is found to come from the spin-orbit type
of relativistic corrections. A double-helicity dependent cross section
is calculated to the same
order, and the effect of the nucleon isoscalar spin-dependent polarizabilities
is found to be smaller than the effect of isoscalar spin-independent ones.
Contributions of spin-independent polarizabilities are investigated in various
asymmetries, one of which has as large as 12 (26) percent effect at the
center-of-mass photon energy 30 (50) MeV.Comment: 22 pages, 8 figures included, replaced with the version submitted to
PR
Pattern of skin disease in Ethiopian HIVâinfected patients on combination antiretroviral therapy: A crossâsectional study in a dermatology referral hospital
Abstract Background More than 90% of human immunodeficiency virus (HIV)âinfected patients will develop at least one type of skin disorder during the course of the disease. The prevalence and severity of skin disease commonly seen in HIVâinfected patients has decreased in the era of combination antiretroviral therapy (cART). Few studies in Ethiopia have shown the magnitude of skin problems among adult patients on cART. The aim of this study is to describe the pattern of skin disease among adult patients who are on cART. Methods Crossâsectional observational study at ALERT Hospital from April 2018 to November 2018. Patterns of clinically diagnosed skin diseases were summarized descriptively. Result A total of 572 patients were evaluated. In total, 412 (72%) were female and the mean age of study participants was 40 (SDÂ =Â 10.4). The median CD4 count at the time of diagnosis and start of cART were 178 (R 5â2000) and 168 cells/ÎŒl (R 5â1327), respectively. The mean duration of cART was 8 (SDÂ =Â 3) years. 89.3% of patients were on first line and 7% on second line of cART regimen. Noninfectious inflammatory skin disorders (40.9%) were the most common concomitant diagnosis followed by infectious diseases (34.9%), infestation (7.7%), pigmentary disorders (6.3%) and cutaneous drug eruption (0.7%), respectively. Among the inflammatory skin disorders, 56.5% presented with eczema. One patient had Kaposi sarcoma. Conclusion Noninfectious inflammatory skin disorders are the most common concomitant skin disease in HIVâinfected patients, with eczema being most prevalent. Infectious skin diseases were also common presentations. In our study, AIDSâdefining skin conditions were rare
Coherent photonuclear reactions for isotope transmutation
Coherent photonuclear isotope transmutation (CPIT) produces exclusively
radioactive isotopes (RIs) by coherent photonuclear reactions via E1 giant
resonances. Photons to be used are medium energy photons produced by laser
photons backscattered off GeV electrons. The cross sections are as large as 0.2
- 0.6 b, being independent of individual nuclides. A large fraction of photons
is effectively used for the photonuclear reactions, while the scattered GeV
electrons remain in the storage ring to be re-used. CPIT with medium energy
photons provides specific/desired RIs with the high rate and the high density
for nuclear science, molecular biology and for nuclear medicines.Comment: 8 pages, 2 figure
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