Electrothermal atomic absorption spectrometry (ETAAS) is considered the most common and advanced technique to determine trace lithium in biological fluids. However, chloride existing in samples has been reported to create serious interferences. Nitric acid was verified as a chemical modifier to eliminate the interference of chloride in determining trace lithium in urine samples and the possible...

For high order interpolations at both end points of two rational Bézier curves, we introduce the concept of C (v,u)-continuity and give a matrix expression of a necessary and sufficient condition for satisfying it. Then we propose three new algorithms, in a unified approach, for the degree reduction of Bézier curves, approximating rational Bézier curves by Bézier curves and the degree reduction...

A FISC or family of intersecting simple closed curves is a collection of simple closed curves in the plane with the properties that there is some open region common to the interiors of all the curves, and that every two curves intersect in nitely many points. Let F be a FISC. Intersections of the curves represent the vertices of a plane graph, G(F), whose edges are the curve arcs between vertic...

We have observed at low temperatures (≤ 8K) hysteretic I(V ) characteristics for sub-μm (∼200 nm) metallic break-junctions based on the heavy-fermion compound UPd2Al3. Degrading the quality of the contacts by in situ increasing the local residual resistivity or temperature rise reduces the hysteresis. We demonstrate that those hysteretic I(V ) curves can be reproduced theoretically by assuming ...

is injective. The theorem, conjectured by Petri and proved by Gieseker [G] (see [EH3] for a much simplified proof), lies at the cornerstone of the theory of algebraic curves. It implies that the variety Gd(C) = {(L, V ) : L ∈ Pic (C), V ∈ G(r + 1,H0(L))} of linear series of degree d and dimension r is smooth and of expected dimension ρ(g, r, d) := g− (r+1)(g−d+ r) and that the forgetful mapGd(C...

We consider a unit speed curve α in Euclidean n-dimensional space E n and denote the Frenet frame by {V 1 ,. .. , V n }. We say that α is a cylindrical helix if its tangent vector V 1 makes a constant angle with a fixed direction U. In this work we give different characterizations of such curves in terms of their curvatures.

Here, a silicon nanopillar array (Si-NPA) was fabricated. It was studied as a room-temperature organic vapour sensor, and the ethanol and acetone gas sensing properties were detected with I-V curves. I-V curves show that these Si-NPA gas sensors are sensitive to ethanol and acetone organic vapours. The turn-on threshold voltage is about 0.5 V and the operating voltage is 3 V. With 1% ethanol ga...

The “noncommutative geometry” of complex algebraic curves is studied. As first step, we clarify a morphism between elliptic curves, or complex tori, and C-algebras Tθ = {u, v | vu = e2πiθuv}, or noncommutative tori. The main result says that under the morphism isomorphic elliptic curves map to the Morita equivalent noncommutative tori. Our approach is based on the rigidity of the length spectra...

The aim of this paper is to make a contribution to the development of the new stronger cryptographic algorithm using chaotic systems and hyperelliptic curve. In this context, the Diffie-Hellman scheme is implemented with chaotic systems and ElGamal scheme is constructed with hyperelliptic curves. Futhermore, the complexity algorithm is determinated for proposed algorithm. Also, this algorithm i...

New photometry of RRab and RRc stars in ω Cen is used to calibrate their absolute magnitudes M V as a function of: a) metallicity; and b) the Fourier parameters of light curves in the V band. The zero point of both calibrations relies on the distance modulus to the cluster derived earlier by the CASE project based on observations of the detached eclipsing binary OGLE GC17. For RRab variables we...