12,051 research outputs found
The Economics of 'Acting White'
No full textThis paper formalizes a sociological phenomenon entitled 'acting white'. The key idea is that individuals face a tension between signaling their type to the outside labor market and signaling their type to a peer group: signals that induce high wages can be signals that induce peer rejection. We prove three basic results: (1) there exists no equilibria in which all types of individuals adopt distinct educational investment levels; (2) when individuals are not too patient, all equilibria satisfying a standard refinement involve a binary partition of the type space in which all types accepted by the group pool on a common low education level and all types rejected by the group separate at distinctly higher levels of education with correspondingly higher wages; and (3) when individuals are very patient, there is an increase in the variation of education levels within the group and an increase in the variance of types deemed acceptable by the group. The more those involved discount the future, the more salient peer pressure becomes and the more homogenous groups become.
White matter damage and cognitive impairment after traumatic brain injury
No full textWhite matter disruption is an important determinant of cognitive impairment after brain injury, but conventional neuroimaging underestimates its extent. In contrast, diffusion tensor imaging provides a validated and sensitive way of identifying the impact of axonal injury. The relationship between cognitive impairment after traumatic brain injury and white matter damage is likely to
be complex. We applied a flexible technique—tract-based spatial statistics—to explore whether damage to specific white matter tracts is associated with particular patterns of cognitive impairment. The commonly affected domains of memory, executive function and information processing speed were investigated in 28 patients in the post-acute / chronic phase following traumatic brain injury and in 26 age-matched controls. Analysis of fractional anisotropy and diffusivity maps revealed widespread differences
in white matter integrity between the groups. Patients showed large areas of reduced fractional anisotropy, as well as increased mean and axial diffusivities, compared with controls, despite the small amounts of cortical and white matter damage visible on standard imaging. A stratified analysis based on the presence or absence of microbleeds (a marker of diffuse axonal injury) revealed diffusion tensor imaging to be more sensitive than gradient-echo imaging to white matter damage. The location of white matter abnormality predicted cognitive function to some extent. The structure of the fornices was correlated with associative learning and memory across both patient and control groups, whilst the structure of frontal lobe connections showed relationships with executive function that differed in the two groups. These results highlight the complexity of the relationships
between white matter structure and cognition. Although widespread and, sometimes, chronic abnormalities of white matter are identifiable following traumatic brain injury, the impact of these changes on cognitive function is likely to depend on damage to key pathways that link nodes in the distributed brain networks supporting high-level cognitive functions
Ah, when the leaves begin to turn and the summer days have passed [first line]
No full textstrophicpiano and voiceTo Isabel Stoneads on back cover for White, Smith & Company stock3939-7Johns Hopkins University, Levy Sheet Music Collection, Box
135, Item 118Words and Music by C.H. White.Chas. H. Crosby lith. Bosto
Ah, when the leaves begin to turn and the summer days have passed [first line]
No full textstrophicpiano and voiceTo Isabel Stoneads on back cover for White, Smith & Company stock3939-7Johns Hopkins University, Levy Sheet Music Collection, Box
135, Item 118Words and Music by C.H. White.Chas. H. Crosby lith. Bosto
- Marble slab with a Persian inscription of Jahāngīr dated AH 1027
No full textMarble slab with a Persian inscription of Jahāngīr dated AH 102
Archival HST and IUE study of the dwarf novae AH Her and CM Del: Exposed white dwarfs?
No full textWe have analyzed HST archival and IUE NEWSIPS archival SWP spectra of the dwarf novae CM Del and AH Her obtained when AAVSO light curve data indicated the occurrence of dwarf nova quiescence. HST archival outburst data for AH Her is examined as well. We have computed synthetic, high gravity spectra in LTE with solar composition using TLUSTY195 and SYNSPEC42 and carried out fits of these models to the far UV continuum and narrow absorption line spectra. For CM Del, we find that the far UV spectrum is dominated by a hot (T-eff = 22,000 K, log g = 8) white dwarf with subsolar Si abundance and all other observed metal transitions at essentially their solar values. For AH Her, we find evidence for a hot white dwarf with T-eff = 27,000 K, log g = 8 and subsolar Si abundances. An HST spectrum (GHRS G160M) of AH Her reveals blue-asymmetric SiIV profiles. If due to wind outflow, we derive a single-scattering upper limit mass loss rate of 10(-9) M./yr(-1). Synthetic profile fits to 12 coadded HST medium resolution G160M spectra of the Si IV (1393Angstrom, 1402Angstrom) resonance doublet of CM Del yield a white dwarf rotational velocity estimate of v sin i = 400 +70/-30 km/s(-1), T-wd = 27, 000K +/- 1000K and Si/H = 1 +0.5/-0.3 x solar. This value of v sin i is discussed in the context of angular momentum transfer and rotation rates for other CV primary degenerate stars
Autoantibody Inhibitor Eradication In Acquired Hemophilia Associated with Cancer: a Retrospective Analysis
No full textAcquired hemophilia (AH), a rare autoimmune disorder primarily of adults, is typically characterized by the presence of IgG oligoclonal antibodies to the clotting factor VIII protein (FVIII). About 10–15% of patients with AH have an underlying malignancy, but the etiologic relationship of cancer to formation of FVIII inhibitor is yet to be determined. To date, there have been no published, comprehensive reviews on the efficacy of various treatments for AH in the context of either solid tumor or hematologic malignancies. Therefore, we have systematically reviewed 86 patients with cancer-associated AH from our own cancer center and from the published literature
The old farm gate hangs sagging down, Ah,
No full textguitars; voiceCollected by Merlin Mitchell
Transcribed by Mary C. Parler
Sung my Mary Jo Davis
Fayetteville, Arkansas
July 14, 1950
Reel 56, Item 2
The Old Farm Gate
The old farm gate hangs sagging down,
Ah, me !
On rusty hinges bent and brown,
Ah, me i
It's latch is gone, and here and there
It shows white (?) traces of repair.
Ah, me ! Ah, me ! Ah, me !
Time passes so quickly away !
The children have upon it dumb
In glee !
And in and out with rapture swung
In glee !
When their young hearts were good and pure,
And hope was fast and faith was sure,
It seems but yesterday !
Time passes so quickly away!
Beside that gate have lovers true,
Ah, me !
Oft told the story always new,
Ah, me !
And made their vows and dreamed of bliss,
And sealed each promise with a kiss.
It seems but yesterday !
Time passes so quickly away !
That gate with rusty weight and chain,
Ah, me !
Has closed upon a funeral train;
Ah, me !
That gate has often opened wide
To welcome home a new-made bride.
It seems but yesterday !
Time passes so quickly away !
But dear to me above all things,
Oh yes!
By reason of the thought it brings,
Oh yes !
Is the dear gate a-hanging down
On rusty hinges bent and brown.
Ah, me ! Ah, me ! Ah, me !
Time passes so quickly away !Funding for digitization provided by the Arkansas Humanities Council and the Happy Hollow Foundation
Are Ethnic and Gender Specific Equations Needed to Derive Fat Free Mass from Bioelectrical Impedance in Children of South Asian, Black African-Caribbean and White European Origin? Results of the Assessment of Body Composition in Children Study
No full textBackground
Bioelectrical impedance analysis (BIA) is a potentially valuable method for assessing lean mass and body fat levels in children from different ethnic groups. We examined the need for ethnic- and gender-specific equations for estimating fat free mass (FFM) from BIA in children from different ethnic groups and examined their effects on the assessment of ethnic differences in body fat.
Methods
Cross-sectional study of children aged 8–10 years in London Primary schools including 325 South Asians, 250 black African-Caribbeans and 289 white Europeans with measurements of height, weight and arm-leg impedance (Z; Bodystat 1500). Total body water was estimated from deuterium dilution and converted to FFM. Multilevel models were used to derive three types of equation {A: FFM = linear combination(height+weight+Z); B: FFM = linear combination(height2/Z); C: FFM = linear combination(height2/Z+weight)}.
Results
Ethnicity and gender were important predictors of FFM and improved model fit in all equations. The models of best fit were ethnicity and gender specific versions of equation A, followed by equation C; these provided accurate assessments of ethnic differences in FFM and FM. In contrast, the use of generic equations led to underestimation of both the negative South Asian-white European FFM difference and the positive black African-Caribbean-white European FFM difference (by 0.53 kg and by 0.73 kg respectively for equation A). The use of generic equations underestimated the positive South Asian-white European difference in fat mass (FM) and overestimated the positive black African-Caribbean-white European difference in FM (by 4.7% and 10.1% respectively for equation A). Consistent results were observed when the equations were applied to a large external data set.
Conclusions
Ethnic- and gender-specific equations for predicting FFM from BIA provide better estimates of ethnic differences in FFM and FM in children, while generic equations can misrepresent these ethnic differences
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