7,459 research outputs found
A study of longitudinal oscillations of propellant tanks and wave propagations in feed lines. Part II - Wave propagation in elastic pipe filled with incompressible viscous fluid
Fluid wave propagation in liquid propellant feed syste
Calcium intake, physical activity and bone health status among Chinese early adolescents
The objective of this cross-sectional study was to determine the relationship between calcium
intake and physical activity with bone health status among Chinese early adolescents. A selfadministered
questionnaire was used to obtain socio-demographic background, family history of
osteoporosis, lifestyle practices and eating habits; while daily calcium intake was assessed using
one-day dietary recall and two-day dietary record. Physical activity was examined using PAQ-A
(Physical Activity Questionnaire for Adolescents). Height, weight and bone health status was
assessed using stadiometer, weighing scale (TANITA), and ultrasonometry QUS-2, respectively.
Data was analysed using the Statistical Package for Social Sciences (SPSS), version 15.0. A total of
236 Chinese subjects were recruited into this study. The mean age of subjects was 13.6 ± 0.5 years
old. Mean daily calcium intake was low, that is 573.4 ± 405.1mg. The mean score of PAQ-A was 2.14
± 0.64. Mean weight, height, and BMI were 50.9 ± 11.4kg, 1.62 ± 0.08m and 19.40 ± 3.72kg/m2,
respectively. Based on CDC classification of BMI-for-age (2000), 68.2% of subjects were in the
normal category, 16.1% were underweight, 11.4% were at risk of overweight and 4.2% overweight.
Mean Broadband Ultrasound Attenuation (BUA) was 77.55 ± 11.73dB/MHz. According to diagnostic
criteria for osteoporosis by WHO (1994), 49.2% of subjects had normal bone mass (t-score > -1.0),
more than half of the subjects were either osteopenic (49.6%) or osteopototic (1.3%). This might be
due to subjects being in the early adolescents state and their peak bone mass has yet to be attained.
T-test showed that there was significant difference between mean body weight among male and
female subjects. There was also significant higher mean BUA among female subjects than their
counterparts. Pearson correlation test showed that there was no significant relationship between
BUA with calcium intake (r= -0.05, p= 0.42) or physical activity (r= 0.03, p= 0.69). However, weight
had a significant positive correlation with BUA (r= 0.39, p<0.05). In conclusion, female subjects
have better bone health status as compared to males. Although no significant relationship was
shown between calcium intake and physical activity with bone health, these two factors are
known to reduce future risk of osteoporosis. It is recommended that prevention and management
of low bone mass should be focused on factors recognised as determinants of bone health status
among early adolescents. This is to ensure optimal bone health being attained among the young
population in reducing risk of osteoporosis in future
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GENOME WIDE DNA METHYLATION PROFILING IS PREDICTIVE OF OUTCOME IN JUVENILE MYELOMONOCYTIC LEUKEMIA
Vlasov Description Of Dense Quark Matter
We discuss properties of quark matter at finite baryon densities and zero
temperature in a Vlasov approach. We use a screened interquark Richardson's
potential consistent with the indications of Lattice QCD calculations.
We analyze the choices of the quark masses and the parameters entering the
potential which reproduce the binding energy (B.E.) of infinite nuclear matter.
There is a transition from nuclear to quark matter at densities 5 times above
normal nuclear matter density. The transition could be revealed from the
determination of the position of the shifted meson masses in dense baryonic
matter. A scaling form of the meson masses in dense matter is given.Comment: 15 pages 4 figure
Coalicion de Salud Comunitaria (COSACO): using a Healthy Community Partnership framework to integrate short-term global health experiences into broader community development
BACKGROUND: There is growing concern that short-term experiences in global health experiences (STEGH), undertaken by healthcare providers, trainees, and volunteers from high income countries in lower and middle income countries, risk harming the community by creating a parallel system of care separate from established community development efforts. At the same time, the inclusion of non-traditional actors in health planning has been the basis of the development of many Healthy Community Partnerships (HCP) being rolled out in Canada and the United States. These partnerships aim to bring all stakeholders with a role to play in health to the table to align efforts, goals and programs towards broad community health goals.
RESULTS: This methodology paper reports on the process used in La Romana, Dominican Republic, in applying a modified HCP framework. This project succeeded at bringing visiting STEGH organizations into a coalition with key community partners and supported attempts to embed the work of STEGH within longer-term, established development plans.
CONCLUSIONS: In presenting the work and process and lessons learned, the hope is that other communities that encounter significant investment from STEGH groups, and will gain the same benefits that were seen in La Romana with regards to improved information exchange, increased cross-communication between silos, and the integration of STEGH into the work of community partners
Theory of monolayers with boundaries: Exact results and Perturbative analysis
Domains and bubbles in tilted phases of Langmuir monolayers contain a class
of textures knows as boojums. The boundaries of such domains and bubbles may
display either cusp-like features or indentations. We derive analytic
expressions for the textures within domains and surrounding bubbles, and for
the shapes of the boundaries of these regions. The derivation is perturbative
in the deviation of the bounding curve from a circle. This method is not
expected to be accurate when the boundary suffers large distortions, but it
does provide important clues with regard to the influence of various energetic
terms on the order-parameter texture and the shape of the domain or bubble
bounding curve. We also look into the effects of thermal fluctuations, which
include a sample-size-dependent effective line tension.Comment: replaced with published version, 21 pages, 16 figures include
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