8,816 research outputs found
My Brother the Mexican
El âPitiâ le decĂan, I never knew why. We lived just outside âEl Barrio,â at least thatâs what they called it, âcause it took too long to say âTlachichilco del Carmen.â Nobody called it that, but my mom. She would make us go to El Barrio a vender âpanquecitos.â Two little gringĂŒitos selling cupcakes en la plaza.
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Incremental Grid-like Layout Using Soft and Hard Constraints
We explore various techniques to incorporate grid-like layout conventions
into a force-directed, constraint-based graph layout framework. In doing so we
are able to provide high-quality layout---with predominantly axis-aligned
edges---that is more flexible than previous grid-like layout methods and which
can capture layout conventions in notations such as SBGN (Systems Biology
Graphical Notation). Furthermore, the layout is easily able to respect
user-defined constraints and adapt to interaction in online systems and diagram
editors such as Dunnart.Comment: Accepted to Graph Drawing 201
Stress-Minimizing Orthogonal Layout of Data Flow Diagrams with Ports
We present a fundamentally different approach to orthogonal layout of data
flow diagrams with ports. This is based on extending constrained stress
majorization to cater for ports and flow layout. Because we are minimizing
stress we are able to better display global structure, as measured by several
criteria such as stress, edge-length variance, and aspect ratio. Compared to
the layered approach, our layouts tend to exhibit symmetries, and eliminate
inter-layer whitespace, making the diagrams more compact
Automorphisms of p-compact groups and their root data
We construct a model for the space of automorphisms of a connected p-compact
group in terms of the space of automorphisms of its maximal torus normalizer
and its root datum. As a consequence we show that any homomorphism to the outer
automorphism group of a p-compact group can be lifted to a group action,
analogous to a classical theorem of de Siebenthal for compact Lie groups. The
model of this paper is used in a crucial way in our paper ``The classification
of 2-compact groups'', where we prove the conjectured classification of
2-compact groups and determine their automorphism spaces.Comment: 24 pages. Introduction restructured and title changed (from
"Automorphisms of root data, maximal torus normalizers, and p-compact
groups"). Various other adjustments mad
Portable random number generators
Computers are deterministic devices, and a computer-generated random number is a contradiction in terms. As a result, computer-generated pseudorandom numbers are fraught with peril for the unwary. We summarize much that is known about the most well-known pseudorandom number generators: congruential generators. We also provide machine-independent programs to implement the generators in any language that has 32-bit signed integers-for example C, C++, and FORTRAN. Based on an extensive search, we provide parameter values better than those previously available.Programming (Mathematics) ; Computers
The Steenrod problem of realizing polynomial cohomology rings
In this paper we completely classify which graded polynomial R-algebras in
finitely many even degree variables can occur as the singular cohomology of a
space with coefficients in R, a 1960 question of N. E. Steenrod, for a
commutative ring R satisfying mild conditions. In the fundamental case R = Z,
our result states that the only polynomial cohomology rings over Z which can
occur, are tensor products of copies of H^*(CP^\infty;Z) = Z[x_2],
H^*(BSU(n);Z) = Z[x_4,x_6,...,x_{2n}], and H^*(BSp(n):Z) =
Z[x_4,x_8,...,x_{4n}] confirming an old conjecture. Our classification extends
Notbohm's solution for R = F_p, p odd. Odd degree generators, excluded above,
only occur if R is an F_2-algebra and in that case the recent classification of
2-compact groups by the authors can be used instead of the present paper. Our
proofs are short and rely on the general theory of p-compact groups, but not on
classification results for these.Comment: 14 pages. v3: Final version. To appear in Journal of Topolog
La vaca
This creative non-fiction piece written in Spanglish is called "La vaca.â The overarching themes of this story are birth, motherhood, siblings and the creative force in a non-conventional American family raised in Mexico. The narrative voice in this piece provides a unique perspective broadening dialogue(s) on Mexican American identity.
 
Molecular evidence of epithelial cell damage caused by iqmik, an Alaska smokeless tobacco mixture
Thesis (M.S.) University of Alaska Fairbanks, 2015The percentage of Alaska Natives who use smokeless tobacco (SLT) is 4 times that of non-Native Alaskans and 45 times higher for Alaska Native women than non-Native women. The use of SLT is concentrated in Southwest Alaska where 32% of all adult Alaska Natives use SLT. Out of those users, 35% use only iqmik, a unique form of SLT in Alaska, which is a combination of tobacco leaf mixed with Phellinus igniarius (punk fungus). There is little evidence of the pathological effects of iqmik to assist in the development of an evidenced-based intervention regarding the harmful effects of iqmik. The current lack of evidence reinforces a belief that iqmik is less harmful than other tobacco alternatives. The overall objective of this thesis is to elucidate the effect of iqmik and iqmik-mediated metal exposure on oxidative stress and nuclear factor- ÎșB (NF-ÎșB) induced inflammation in human gingival epithelial cells. The central hypothesis of this thesis is that cadmium (Cd), cobalt (Co) and nickel (Ni) accumulate in human gingival epithelial cells from iqmik treatments, inducing oxidative stress and promoting an intracellular environment that alters NF-ÎșB proinflammatory signaling targets. Our findings indicate that iqmik is a greater source of heavy metals, such as Cd, Co and Ni, than air-cured tobacco leaf. Human gingival epithelial cells accumulate more Cd, Co and Ni from the punk ash component of iqmik than from the air-cured tobacco. These metals have the capacity to accumulate in cells from iqmik treatments and generate and propagate the production of endogenous reactive oxygen species (ROS), which activates NF-ÎșB significantly altering its signaling targets, more so than tobacco alone. The results of this thesis identify iqmik as a unique health hazard compared to other tobacco products and enhances our understanding of how iqmik may contribute to oral pathologies
SimĂłn
This creative non-fiction piece written in Spanglish is called "SimĂłn.â The overarching themes of this story are death, spirituality, animals and pets in a non-conventional American family raised in Mexico. The narrative voice in this piece provides a unique perspective broadening dialogue(s) on Mexican American identity
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