parameters that have to be measured in gel dosimetry. however, the resolution in gel is strongly dependant on gel composition. selection of optimum method in dose response readout and proper values of parameters can result in noise reduction as well as improvement of contrast, and spatial resolution considerably. materials and methods: magica polymer gel dosimeters were manufactured and irradia...

BACKGROUND To evaluate the detectability of arterial acute thrombus on R2* map by iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) IQ compared with T2*-weighted imaging (T2*WI). METHODS Twenty-six patients with acute cerebral infarction who underwent R2* map and T2*WI were reviewed. We performed visual assessment of each sequence regarding the ...

We studied the transcription program of Aleutian mink disease parvovirus (ADV) by using a combination of cDNA cloning and sequencing, primer extension, and Northern (RNA) blot hybridization with splice-specific oligonucleotides. The 4.8-kilobase ADV genome was transcribed in the rightward direction, yielding plus-sense polyadenylated transcripts of 4.3 (R1 RNA), 2.8 (R2), 2.8 (R3), 1.1 (RX), an...

This paper studies the behavior under iteration of the maps Tab(x, y) = (Fab(x)−y, x) of the plane R2, in which Fab(x) = ax if x ≥ 0 and bx if x < 0. The orbits under iteration correspond to solutions of the nonlinear difference equation xn+2 = 1/2(a− b)|xn+1|+1/2(a+ b)xn+1−xn. This family of piecewise-linear maps has the parameter space (a, b) ∈ R2. These maps are area-preserving homeomorphism...

We study the family of the Lozi maps La,b : R2 → R2, La,b(x, y) = (1+y−a|x|, bx), and their strange attractors Λa,b. We introduce the set of kneading sequences for the Lozi map and prove that it determines the symbolic dynamics for that map. We also introduce two other equivalent approaches. 2010 Mathematics Subject Classification: 37B10, 37D45, 37E30, 54H20

We obtain a criterion for approximability of piecewise linear maps S1 → R2 by embeddings, analogous to the one proved by Minc for piecewise linear maps I → R2. Theorem. Let φ : S1 → R2 be a piecewise linear map, which is simplicial for some triangulation of S1 with k vertices. The map φ is approximable by embeddings if and only if for each i = 0, . . . , k the i-th derivative φ(i) (defined by M...

This note addresses the quantitative aspect of the bilipschitz extension problem. The main result states that any bilipschitz embedding of R into R2 can be extended to a bilipschitz self-map of R2 with a linear bound on the distortion.

We show that the intersection of three subgroups in a free group is related to the computation of the third homotopy group π3. This generalizes a result of Gutierrez-Ratcliffe who relate the intersection of two subgroups with the computation of π2. Let K be a twodimensional CW-complex with subcomplexes K1,K2,K3 such that K = K1 ∪ K2 ∪ K3 and K1 ∩ K2 ∩ K3 is the 1-skeleton K of K. We construct a...

We establish the local well-posedness of the modified Schrödinger map in H3/4+ε(R2).