Special class of surfaces, two-axial surfaces of revolution created by the Euclidean metric transformation of a simultaneous revolution about two different axes, is presented in the paper. Three specific subclasses of surfaces are classified with respect to the superposition of the two axes 1o, 2o of revolution. There are defined several types of two-axial surfaces of revolution specifying the ...

Spatially homogeneous random walks in (Z+) 2 with non-zero jump probabilities at distance at most 1, with non-zero drift in the interior of the quadrant and absorbed when reaching the axes are studied. Absorption probabilities generating functions are obtained and the asymptotic of absorption probabilities along the axes is made explicit. The asymptotic of the Green functions is computed along ...

Cryopreservation of germplasm in liquid nitrogen (LN) is a perfect method for the long-term conservation of plant genetic resources. Lily [Lilium ledebourii (Baker) Bioss.], Persian lilac (Melia azedarach L.), and tea (Camellia sinensis L.) were evaluated for long-term storage in liquid nitrogen (LN) at -196oC. Encapsulation within alginate beads was shown to be beneficial in all studied specie...

INTRODUCTION The GENEA shows high accuracy for classification of sedentary, household, walking, and running activities when sampling at 80 Hz on three axes. It is not known whether it is possible to decrease this sampling frequency and/or the number of axes without detriment to classification accuracy. The purpose of this study was to compare the classification rate of activities on the basis o...

The retrodiction of spin measurements along a set of different axes is revisited in detail. The problem is presented in two different pictures, a geometric and a general algebraic one. Explicit measurement operators that allow the retrodiction are given for the case of three and four axes. For the Vaidman-Aharanov-Albert case of three orthogonal axes the quantum network is constructed for two d...

Many previous studies employing paradigms such as adaptation, masking and summation-near-threshold have demonstrated the existence of separate mechanisms underlying the detection of the three cardinal axes of color space: L+M, L-M and S-(L+M). In addition, some studies have demonstrated the existence of higher-order mechanisms tuned to non-cardinal axes (which are made up of combinations of the...

A robust version of the output controller design for discrete-time systems is introduced. Instead of a single stable point a stable polytope is preselected in the closed loop characteristic polynomial coefficient space. A constructive procedure for generating stable polytopes is given starting from the unit hypercube of reflection coefficients of monic polynomials. This procedure is quite strai...

We investigate generalized quadrangles Γ that admit at least two projective axes of symmetry. We show that if there are three such axes incident with a common point x, then x is a translation point of Γ. In case that Γ is moreover a compact connected quadrangle with topological parameters (p, p), p ∈ N, then Γ is a topological translation generalized quadrangle. We further investigate the case ...

In this paper, we propose integral invariants based on group invariant parameterisation. The new invariants do not suuer from occlusion problems, do not require any correspondence of image features unlike existing algebraic invariants, and are less sensitive to noise than diier-ential invariants. Our framework applies aane diierential geometry to derive novel aane integral invariants. The new i...

Dama Technologies specializes in the manufacture of machines which are able to process glass, ceramics and other hard-brittle materials at high precision. One of the highlights of the program is the five-axis, USG 500 ultrasound-assisted grinder, in which a hightorque Lehmann EA 520.L rotary table functions as a swiveling machine table. It contains a high-speed torque axis, which was manufactur...