406 research outputs found
Conformal and CR mappings on Carnot groups
We consider a class of stratified groups with a CR structure and a compatible
control distance. For these Lie groups we show that the space of conformal maps
coincide with the space of CR and anti-CR diffeomorphisms. Furthermore, we
prove that on products of such groups, all CR and anti-CR maps are product
maps, up to a permutation isomorphism, and affine in each component
Focal Points of Introducing China Dream Into Classroom, Into Textbooks and Into University Students’ Mind
Concerning the work of introducing China Dream into class, into textbooks and into university students’ mind, three focal points need to be highly stressed, namely, laying the solid ideological foundation of practicing China Dream, enriching and expanding the primary coverage of practicing China Dream, and then clarifying the conjunction between students’ voluntary practicing China Dream and their self-fulfillment
Global well-posedness for the 2D incompressible heat conducting Navier-Stokes equations with temperature-dependent coefficients and vacuum
We consider the initial boundary problem of 2D non-homogeneous incompressible
heat conducting Navier-Stokes equations with vacuum, where the viscosity and
heat conductivity depend on temperature in a power law of Chapman-Enskog. We
derive the global existence of strong solution to the initial-boundary value
problem, which is not trivial, especially for the nonisentropic system with
vacuum. Significantly, our existence result holds for the cases that the
viscosity and heat conductivity depend on with possibly different
power laws (i.e., with constants ) with smallness assumptions only on and the measure
of initial vacuum domain. In particular, the initial data can be arbitrarily
large. Moreover, it is obtained that both velocity and temperature decay
exponentially as time tends to infinity.Comment: 28 pages. Any comments are welcom
Optimal lifting of Levi-degenerate hypersurfaces and applications to the Cauchy--Szeg\"o projection
We consider a family of Levi-degenerate finite type hypersurfaces in , where in general there is no group structure. We lift these domains to
stratified Lie groups via a constructive proof, which optimizes the well-known
lifting procedure to free Lie groups of general manifolds defined by Rothschild
and Stein. This yields an explicit version of the Taylor expansion with respect
to the horizontal vector fields induced by the sub-Riemannian structure on
these hypersurfaces. Hence, as an application, we establish the Schatten class
estimates for the commutator of the Cauchy--Szeg\"{o} projection with respect
to a suitable quasi-metric defined on the hypersurface
The Kohn-Laplacian and Cauchy-Szeg\"{o} projection on Model Domains
We study the Kohn-Laplacian and its fundamental solution on some model
domains in , and further discuss the explicit kernel of the
Cauchy-Szeg\"o projections on these model domains using the real analysis
method. We further show that these Cauchy-Szeg\"o kernels are
Calder\'on-Zygmund kernels under the suitable quasi-metric
Type IIs restriction based combinatory modulation technique for metabolic pathway optimization
Additional file 1: Table S1. Oligonucleotides used in this study
Combinatory optimization of chromosomal integrated mevalonate pathway for β-carotene production in Escherichia coli
Additional file 1: Table S1. Primers used in this work. Table S2. Modulating genes of mvaS-mvaA-mavD1 operon for improving β-carotene production. Table S3. Modulating genes of Hmg1-erg12 operon for improving β-carotene production. Table S4. Sequences of representative artificial regulatory parts. Table S5. Plasmids used in this work. Table S6. Escherichia coli strains used in this work. Table S7. Calculated strength of mvaS and Hmg1 RBS, RBS sequence and relative β-carotene yield of strains from Re-modulation libraries. Figure S1. Two-step recombination method for inserting Hmg1-erg12 operon in E. coli chromosome. Figure S2. Two-step recombination method for modulating gene expression in E. coli chromosome by different artificial regulatory parts
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