Now showing items 31-40 of 2969
A survey of algebraic unitary codes
This survey paper gives an overview of algebraic unitary codes. It describes the coding problem involved, and present several algebraic approaches yielding interesting constructions, as well as the latest bounds.
Constructions of relative difference sets with classical parameters and circulant weighing matrices
In this paper, a new family of relative difference sets with parameters (m,n,k,λ)=((q^7-1)/(q-1), 4(q-1), q^6, q^5/4) is constructed where q is a 2-power. The construction is based on the technique used in . By ...
The sizes of optimal q-ary codes of weight three and distance four : a complete solution
This correspondence introduces two new constructive techniques to complete the determination of the sizes of optimal q-ary codes of constant weight three and distance four.
Improved lower bounds for constant GC-content DNA codes
The design of large libraries of oligonucleotides having constant GC-content and satisfying Hamming distance constraints between oligonucleotides and their Watson-Crick complements is important in reducing hybridization ...
The influence of preparation conditions on the surface area of zirconia
The conditions for preparation of high surface area zirconia were studied. Samples were prepared by precipitation from aqueous solutions of zirconium chloride with ammonium hydroxide. The order of addition of the reactants ...
Kagome antiferromagnet : a Schwinger-boson mean-field theory study
The Heisenberg antiferromagnet on the kagome lattice is studied in the framework of Schwinger-boson mean-field theory. Two solutions with different symmetries are presented. One solution gives ...
Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass
Several experiments indicate that there are atomic tunneling defects in plastically deformed metals. How this is possible has not been clear, given the large mass of the metal atoms. Using a classical molecular-dynamics ...
Enumeration of small nonisomorphic 1-rotational twofold triple systems
In this paper, twofold triple systems of order v are enumerated for all v ≤ 19. The existence of TS(v , 2)'s (all terms are defined in §2) is completely settled; the condition v -0 or 1 (mod 3) is known to be both ...
Recognition of atypical 5' splice sites by shifted base-pairing to U1 snRNA
Accurate pre-mRNA splicing is critical for gene expression. The 5' splice site (5' ss) — the highly diverse element at the 5' end of introns — is initially recognized via base-pairing to the ...
A bistable pretzelane
A switchable donor–acceptor pretzelane composed of a crown ether containing tetrathiafulvalene and 1,5-dihydroxynaphthalene recognition units and a covalently ...