134 research outputs found
Oil baits for grasshopper and armyworm control
Cover title.Includes bibliographical references
How to recognize some common insect enemies of stored grain
In cooperation with Illinois Natural History Survey
Protecting shade trees from insect damage
In cooperation with Illinois State Natural History Survey.Includes index.Cover title
Fighting grasshoppers on Illinois farms
In cooperation with Illinois State Natural History Survey
Sun exposure behaviour, seasonal vitamin D deficiency, and relationship to bone health in adolescents
YesContext: Vitamin D is essential for bone health in adolescence, where there is rapid bone mineral
content accrual. As cutaneous sun-exposure provides vitamin D, there is no recommended oral intake
for UK adolescents.
Objective: Assess seasonal vitamin D status and its contributors in white Caucasian adolescents, and
examine bone health in those found deficient.
Design: Prospective cohort study.
Setting: Six schools in Greater Manchester, UK.
Participants: 131 adolescents, 12–15 years.
Intervention(s): Seasonal assessment of circulating 25-hydroxyvitamin D (25OHD), personal sunexposure
and dietary vitamin D. Adolescents deficient (25OHD <10 ng/mL/25 nmol/L) in ≥one
season underwent dual-energy X-ray absorptiometry (lumbar spine, femoral neck), with bone mineral
apparent density (BMAD) correction for size, and peripheral quantitative computed tomography
(distal radius) for volumetric (v)BMD.
Main Outcome Measure: Serum 25OHD; BMD.
Results: Mean 25OHD was highest in September: 24.1 (SD 6.9) ng/mL and lowest in January: 15.5
(5.9) ng/mL. Over the year, 16% were deficient in ≥one season and 79% insufficient (25OHD <20
ng/mL/50 nmol/L) including 28% in September. Dietary vitamin D was low year-round while
personal sun-exposure was seasonal and predominantly across the school week. Holidays accounted
for 17% variation in peak 25OHD (p<0.001). Nineteen adolescents underwent bone assessment,
which showed low femoral neck BMAD versus matched reference data (p=0.0002), 3 with Z≤ -2.0
distal radius trabecular vBMD.
Conclusions: Sun-exposure levels failed to provide adequate vitamin D, ~one-quarter adolescents
insufficient even at summer-peak. Seasonal vitamin D deficiency was prevalent and those affected
had low BMD. Recommendations on vitamin D acquisition are indicated in this age-group.The Bupa Foundation (Grant number TBF-M10-017)
Transmissibility of non-linear output frequency response functions with application in detection and location of damage in MDOF structural systems
Transmissibility is a well-known linear system concept that has been widely applied in the diagnosis of damage in various engineering structural systems. However, in engineering practice, structural systems can behave non-linearly due to certain kinds of damage such as, e.g., breathing cracks. In the present study, the concept of transmissibility is extended to the non-linear case by introducing the Transmissibility of Non-linear Output Frequency Response Functions (NOFRFs). The NOFRFs are a concept recently proposed by the authors for the analysis of non-linear systems in the frequency domain. A NOFRF transmissibility-based technique is then developed for the detection and location of both linear and non-linear damage in MDOF structural systems. Numerical simulation results verify the effectiveness of the new technique. Experimental studies on a three-storey building structure demonstrate the potential to apply the developed technique to the detection and location of damage in practical MDOF engineering structures
Electromagnetic form factors of charged and neutral kaons in an extended vector-meson-dominance model
A model is developed for electromagnetic form factors of the charged and
neutral K-mesons. The formalism is based on ChPT Lagrangians with vector
mesons. The form factors, calculated without fitting parameters, are in a good
agreement with experiment for space-like and time-like photon momenta.
Contribution of the two-kaon channels to the muon anomalous magnetic moment
a_\mu is calculated.Comment: 23 pages, 11 figures, accepted for publication in Eur. Phys. J.
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