58,222 research outputs found
Kinematics of the South Atlantic rift
The South Atlantic rift basin evolved as branch of a large
Jurassic-Cretaceous intraplate rift zone between the African and South American
plates during the final breakup of western Gondwana. By quantitatively
accounting for crustal deformation in the Central and West African rift zone,
we indirectly construct the kinematic history of the pre-breakup evolution of
the conjugate West African-Brazilian margins. Our model suggests a causal link
between changes in extension direction and velocity during continental
extension and the generation of marginal structures such as the enigmatic
Pre-salt sag basin and the S\~ao Paulo High. We model an initial E-W directed
extension between South America and Africa (fixed in present-day position) at
very low extensional velocities until Upper Hauterivian times (126 Ma)
when rift activity along in the equatorial Atlantic domain started to increase
significantly. During this initial 17 Myr-long stretching episode the
Pre-salt basin width on the conjugate Brazilian and West African margins is
generated. An intermediate stage between 126.57 Ma and Base Aptian is
characterised by strain localisation, rapid lithospheric weakening in the
equatorial Atlantic domain, resulting in both progressively increasing
extensional velocities as well as a significant rotation of the extension
direction to NE-SW. Final breakup between South America and Africa occurred in
the conjugate Santos--Benguela margin segment at around 113 Ma and in the
Equatorial Atlantic domain between the Ghanaian Ridge and the Piau\'i-Cear\'a
margin at 103 Ma. We conclude that such a multi-velocity, multi-directional
rift history exerts primary control on the evolution of this conjugate passive
margins systems and can explain the first order tectonic structures along the
South Atlantic and possibly other passive margins.Comment: 46 Pages, 22 figures. Submitted to Solid Earth
(http://www.solid-earth.net). Abstract shortened due to arXiv restrictions.
New version contains revisions and amendments as per reviewers requests.
Supplementary data is available at
http://datahub.io/en/dataset/southatlanticrif
Spartan Daily, June 9, 1954
Volume 42, Issue 157https://scholarworks.sjsu.edu/spartandaily/12051/thumbnail.jp
Height and timing of growth spurt during puberty in young people living with vertically acquired HIV in Europe and Thailand.
OBJECTIVE: The aim of this study was to describe growth during puberty in young people with vertically acquired HIV. DESIGN: Pooled data from 12 paediatric HIV cohorts in Europe and Thailand. METHODS: One thousand and ninety-four children initiating a nonnucleoside reverse transcriptase inhibitor or boosted protease inhibitor based regimen aged 1-10 years were included. Super Imposition by Translation And Rotation (SITAR) models described growth from age 8 years using three parameters (average height, timing and shape of the growth spurt), dependent on age and height-for-age z-score (HAZ) (WHO references) at antiretroviral therapy (ART) initiation. Multivariate regression explored characteristics associated with these three parameters. RESULTS: At ART initiation, median age and HAZ was 6.4 [interquartile range (IQR): 2.8, 9.0] years and -1.2 (IQR: -2.3 to -0.2), respectively. Median follow-up was 9.1 (IQR: 6.9, 11.4) years. In girls, older age and lower HAZ at ART initiation were independently associated with a growth spurt which occurred 0.41 (95% confidence interval 0.20-0.62) years later in children starting ART age 6 to 10 years compared with 1 to 2 years and 1.50 (1.21-1.78) years later in those starting with HAZ less than -3 compared with HAZ at least -1. Later growth spurts in girls resulted in continued height growth into later adolescence. In boys starting ART with HAZ less than -1, growth spurts were later in children starting ART in the oldest age group, but for HAZ at least -1, there was no association with age. Girls and boys who initiated ART with HAZ at least -1 maintained a similar height to the WHO reference mean. CONCLUSION: Stunting at ART initiation was associated with later growth spurts in girls. Children with HAZ at least -1 at ART initiation grew in height at the level expected in HIV negative children of a comparable age
NACCS 27th Annual Conference
Sabiduría, Lucha, y Liberación: Youth, Community & Culture en el Nuevo SolMarch 22-25, 2000Downtown Hiltonhttps://scholarworks.sjsu.edu/naccs_programs/1017/thumbnail.jp
Spartan Daily, December 3, 1954
Volume 43, Issue 50https://scholarworks.sjsu.edu/spartandaily/12102/thumbnail.jp
Spartan Daily, February 13, 1951
Volume 39, Issue 86https://scholarworks.sjsu.edu/spartandaily/11508/thumbnail.jp
Spartan Daily, June 13, 1951
Volume 39, Issue 160https://scholarworks.sjsu.edu/spartandaily/11575/thumbnail.jp
Linearity Testing Against a Fuzzy Rule-based Model
In this paper, we introduce a linearity test for fuzzy rule-based models in the framework of time series modeling. To do so, we explore a family of statistical models, the regime switching autoregressive models, and the relations that link them to the fuzzy rule-based models. From these relations, we derive a Lagrange Multiplier linearity test and some properties of the maximum likelihood estimator needed for it. Finally, an empirical study of the goodness of the test is presented.fuzzy rule-based models, time series, linearity test, statistical inference
Spartan Daily, May 4, 1944
Volume 32, Issue 126https://scholarworks.sjsu.edu/spartandaily/10931/thumbnail.jp
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