324 research outputs found
Getting in Trouble: The Meaning of School for Problem Students
Three students attending an alternative school were selected because they had been labeled by their previous school and teachers as problem students. A series of interviews was completed with each individual with the purpose of exploring the meaning of school for each. Each participant indicated an acceptance of the notion that education is important, but each also felt negatively about school. Good and bad things about school were discussed as well as good and bad experiences. The participants also discussed how they perceived the actions and expectations of others. The unfairness they each experienced in school was discussed as well as how they have internalized the definitions others have applied to them. The relationship with teachers and the school in general were discussed with emphasis placed upon the importance of establishing and maintaining caring and concerned relations as well as the importance of making learning relevant
Photoionization of Galactic Halo Gas by Old Supernova Remnants
We present new calculations on the contribution from cooling hot gas to the
photoionization of warm ionized gas in the Galaxy. We show that hot gas in
cooling supernova remnants (SNRs) is an important source of photoionization,
particularly for gas in the halo. We find that in many regions at high latitude
this source is adequate to account for the observed ionization so there is no
need to find ways to transport stellar photons from the disk. The flux from
cooling SNRs sets a floor on the ionization along any line of sight. Our model
flux is also shown to be consistent with the diffuse soft X-ray background and
with soft X-ray observations of external galaxies.
We consider the ionization of the clouds observed towards the halo star HD
93521, for which there are no O stars close to the line of sight. We show that
the observed ionization can be explained successfully by our model EUV/soft
X-ray flux from cooling hot gas. In particular, we can match the H alpha
intensity, the S++/S+ ratio, and the C+* column. From observations of the
ratios of columns of C+* and either S+ or H0, we are able to estimate the
thermal pressure in the clouds. The slow clouds require high (~10^4 cm^-3 K)
thermal pressures to match the N(C+*)/N(S+) ratio. Additional heating sources
are required for the slow clouds to maintain their ~7000 K temperatures at
these pressures, as found by Reynolds, Hausen & Tufte (1999).Comment: AASTeX 5.01; 34 pages, 2 figures; submitted to Astrophysical Journa
Role of Stromal Cells in Protecting Young and Aged B-Lineage Precursors from Dexamethasone-Induced Apoptosis
Community Sport Service Provision, Resident Satisfaction, and Participation
Advocating for the âgold medal strategyâ, China has made great advancements in elite sports; however, the significant achievement in elite sports has not translated into the development of mass sport participations. To form a stronger foundation of a sport pyramid, more attention should be directed to community sports and promoting healthy lifestyles. The purpose of this study was to examine the impact of community sport service provisions on participantsâ satisfaction and in turn on their sport participation behavior. In the current study, the public sport service in community includes sport facilities, sport organizations, sport programs, fitness test, and volunteer services (fitness guide). According to the hierarchy of effects model of Lavidge and Steiner (1961), both hard services and soft services were hypothesized to exert positive influences on consumer satisfaction and participation behavior in community sport (i.e., payment and participation frequency).
Of the 750 copies distributed in Guangdong, China, 576 valid questionnaires were completed and returned, yielding a usable response rate of 76.8%. The first half of the sample was used to conduct exploratory factor analyses (EFA) for the provision items; the second half was used to conduct confirmatory factor analyses (CFA) of these two measures and also conduct a structural equation modeling (SEM) analysis to examine the relationships among public service provision, consumer satisfaction, and consumption behavior in community sports. The results of EFA and CFA indicated that five aspects of community sport service provision could be categorized into hard service and soft services. Specifically, hard refers to sport facility, organization building and organizing activity which can be seen and touched while soft service refers to fitness test, fitness instruction and sport information which sometimes are intangible. The results of SEM suggested that hard service provision positively influenced consumer satisfaction (β = .685, p \u3c .01), whereas soft service provision did not exert significant influence on consumer satisfaction (β = .210, p \u3e .05). Satisfaction would positively impact the frequency of participation was supported (β = .212, p \u3c .01). Consumer satisfaction would positively impact the level of payment for participating in sport organizations was rejected (β = -.298, p \u3c .01).
In conclusion, the present study provided empirical evidence that hard sport service in community, as measured by the sport facility, grassroots sport organization and sport activity program, is an important element of the public sport service construct in the context of community sports. Furthermore, it highlighted that these programs have had a strong influence on resident satisfaction and participation behavior. The resulting theoretical framework is therefore applicable in this context. Lastly, the results revealed the important role of satisfaction in the prediction of residentsâ future behaviors. By understanding the major drivers of residentsâ behaviors, local sport councils, community managers, grassroots organizations, and residents could work together to establish a nonhierarchical and cooperative mechanism that facilitates sport participation
17âÎą estradiol ameliorates ageâassociated sarcopenia and improves lateâlife physical function in male mice but not in females or castrated males
Pharmacological treatments can extend mouse lifespan, but lifespan effects often differ between sexes. 17âÎą estradiol (17aE2), a less feminizing structural isomer of 17âβ estradiol, produces lifespan extension only in male mice, suggesting a sexually dimorphic mechanism of lifespan regulation. We tested whether these antiâaging effects extend to anatomical and functional agingâimportant in lateâlife healthâand whether gonadally derived hormones control aging responses to 17aE2 in either sex. While 17aE2 started at 4 months of age diminishes body weight in both sexes during adulthood, in lateâlife 17aE2âtreated mice better maintain body weight. In 17aE2âtreated male mice, the higher body weight is associated with heavier skeletal muscles and larger muscle fibers compared with untreated mice during aging, while treated females have heavier subcutaneous fat. Maintenance of skeletal muscle in male mice is associated with improved grip strength and rotarod capacity at 25 months, in addition to higher levels of most amino acids in quadriceps muscle. We further show that sexâspecific responses to 17aE2âmetabolomic, structural, and functionalâare regulated by gonadal hormones in male mice. Castrated males have heavier quadriceps than intact males at 25 months, but do not respond to 17aE2, suggesting 17aE2 promotes an antiâaging skeletal muscle phenotype similar to castration. Finally, 17aE2 treatment benefits can be recapitulated in mice when treatment is started at 16 months, suggesting that 17aE2 may be able to improve aspects of lateâlife function even when started after middle age.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/148386/1/acel12920_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/148386/2/acel12920.pd
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Application of Gauss's theorem to quantify localized surface emissions from airborne measurements of wind and trace gases
Airborne estimates of greenhouse gas emissions are becoming more
prevalent with the advent of rapid commercial development of trace gas
instrumentation featuring increased measurement accuracy, precision, and
frequency, and the swelling interest in the verification of current emission
inventories. Multiple airborne studies have indicated that emission
inventories may underestimate some hydrocarbon emission sources in USÂ oil-
and gas-producing basins. Consequently, a proper assessment of the accuracy
of these airborne methods is crucial to interpreting the meaning of such
discrepancies. We present a new method of sampling surface sources of any
trace gas for which fast and precise measurements can be made and apply it to
methane, ethane, and carbon dioxide on spatial scales of ââź 1000âŻm,
where consecutive loops are flown around a targeted source region at
multiple altitudes. Using Reynolds decomposition for the scalar
concentrations, along with Gauss's theorem, we show that the method
accurately accounts for the smaller-scale turbulent dispersion of the local
plume, which is often ignored in other average mass balance methods. With
the help of large eddy simulations (LES) we further show how the circling
radius can be optimized for the micrometeorological conditions encountered
during any flight. Furthermore, by sampling controlled releases of methane
and ethane on the ground we can ascertain that the accuracy of the method, in
appropriate meteorological conditions, is often better than 10âŻ%, with
limits of detection below 5âŻkgâŻhâ1 for both methane and ethane. Because of the FAA-mandated minimum flight safe altitude of 150âŻm, placement of the aircraft is critical to preventing a large portion of the emission plume from flowing underneath the lowest aircraft sampling altitude, which is generally the leading source of uncertainty in these measurements. Finally, we show how the accuracy of the method is strongly dependent on the number of sampling loops and/or time spent sampling the source plume
and processes with polarized muons and supersymmetric grand unified theories
and processes are
analyzed in detail with polarized muons in supersymmetric grand unified
theories. We first present Dalitz plot distribution for decay based on effective Lagrangian with general
lepton-flavor-violating couplings and define various P- and T-odd asymmetries.
We calculate branching ratios and asymmetries in supersymmetric SU(5) and
SO(10) models taking into account complex soft supersymmetry breaking terms.
Imposing constraints from experimental bounds on the electron, neutron and
atomic electric dipole moments, we find that the T-odd asymmetry for can be 15% in the SU(5) case. P-odd asymmetry with respect
to muon polarization for varies from -20% to -100%
for the SO(10) model while it is in the SU(5) case. We also show that
the P-odd asymmetries in and the ratio of
and branching
fractions are useful to distinguish different models.Comment: 52 pages, 15 figure
Japanese haemodialysis anaemia management practices and outcomes (1999â2006): results from the DOPPS
Background. Japanese haemodialysis (HD) patients not only have a very low mortality and hospitalization risk but also low haemoglobin (Hb) levels. Internationally, anaemia is associated with mortality, hospitalization and health-related quality of life (QoL) measures of HD patients
A more fine-grained measure towards animal welfare: a study with regards to gender differences in Spanish students
The environmental issue is nowadays taking more importance in the environmental awareness all around the world, and in this field, animal consideration is more and more spread. A highlighted part in globalisation is the animal welfare awareness. This article presents a study comparing attitudes towards animals among secondary and university students in reference to gender. It was carried out on 1394 Spanish participants from 11 to 26Â years. The instrument used in the study is the reviewed version of the Animal Welfare Attitude Scale which was renamed as âAnimal Welfare Attitude-Revised Scaleâ (AWA-R Scale), with a Cronbach a reliability value of 0.85. It is subdivided into four components namely C1: animal abuse for pleasure or due to ignorance; C2: leisure with animals; C3: farm animals; and C4: animal abandonment. These components have been deeply detailed by a confirmatory factor analysis (CFA), which highly contributes to define the position of participants for the different dimensions of animal welfare. It is concluded that significant differences exist between malesâ and femalesâ attitudes in all components of the AWA-R Scale. It is also suggested that two social characteristicsâpeopleâs attitudes towards animals and towards environmental protectionâare, at the very least, coexistent and may indeed be interdependent. These differences between gender in matters of socialisation could thus be reflected in environmental attitudes, and also in others related to them, i.e. animal welfare attitudes
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Combining macula clinical signs and patient characteristics for age-related macular degeneration diagnosis: a machine learning approach
Background: To investigate machine learning methods, ranging from simpler interpretable techniques to complex (non-linear) âblack-boxâ approaches, for automated diagnosis of Age-related Macular Degeneration (AMD).
Methods: Data from healthy subjects and patients diagnosed with AMD or other retinal diseases were collected during routine visits via an Electronic Health Record (EHR) system. Patientsâ attributes included demographics and, for each eye, presence/absence of major AMD-related clinical signs (soft drusen, retinal pigment epitelium, defects/ pigment mottling, depigmentation area, subretinal haemorrhage, subretinal fluid, macula thickness, macular scar, subretinal fibrosis). Interpretable techniques known as white box methods including logistic regression and decision trees as well as less interpreitable techniques known as black box methods, such as support vector machines (SVM), random forests and AdaBoost, were used to develop models (trained and validated on unseen data) to diagnose AMD. The gold standard was confirmed diagnosis of AMD by physicians. Sensitivity, specificity and area under the receiver operating characteristic (AUC) were used to assess performance.
Results: Study population included 487 patients (912 eyes). In terms of AUC, random forests, logistic regression and adaboost showed a mean performance of (0.92), followed by SVM and decision trees (0.90). All machine learning models identified soft drusen and age as the most discriminating variables in cliniciansâ decision pathways to diagnose AMD. C
Conclusions: Both black-box and white box methods performed well in identifying diagnoses of AMD and their decision pathways. Machine learning models developed through the proposed approach, relying on clinical signs identified by retinal specialists, could be embedded into EHR to provide physicians with real time (interpretable) support
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