It is shown that a timelike radial geodesic does not become null at the event horizon. Recently an attempt was made to demonstrate that in the Schwarzschild geometry the radial geodesics of material particles become null at the event horizon [1]. For this purpose, was derived an expression that corresponds to the velocity of a material particle following a radial trajectory as measured by an ob...

In this article we present a low-cost coprocessor for smartcards which supports all necessary mathematical operations for a fast calculation of the Elliptic Curve Digital Signature Algorithm (ECDSA) based on the finite field GF(2m). These ECDSA operations are GF(2m) addition, 4-bit digit-serial multiplication in GF(2m), inversion in GF(2m), and inversion in GF(p). An efficient implementation of...

Directed sequences have been recently introduced and used for constructing new orthogonal designs. The construction is achieved by multiplying the length and type of suitable compatible sequences. In this paper we show that near normal sequences of length n = 4m + 1 can be used to construct four directed sequences of lengths 2m+1, 2m+1, 2m, 2m and type (4m+1, 4m+1) = (n, n) with zero NPAF. The ...

CD4+ and CD8+ alpha/beta+ T cells of the T helper cell (Th)2 phenotype produce the cytokines IL-4, IL-5, and IL-13 that promote IgE production and eosinophilic inflammation. IL-4 may play an important role in mediating the differentiation of antigenically naive alpha/beta+ T cells into Th2 cells. Murine NK1.1+ (CD4+ or CD4-CD8-) alpha/beta+ T cells comprise a beta 2-microglobulin (beta 2m)-depe...

Those (2m−1)-edge-colourings of a spanning subgraph of K2m , consisting of Kr and independent edges, that can be embedded in a (2m− 1)-edge-colouring of K2m are characterised.

In previous papers we solved the Landau problems, indexed by 2M , for a particle on the “superflag” SU(2|1)/[U(1) × U(1)], the M = 0 case being equivalent to the Landau problem for a particle on the “supersphere” SU(2|1)/[U(1|1)]. Here we solve these models in the planar limit. For M = 0 we have a particle on the complex superplane C; its Hilbert space is the tensor product of that of the Landa...

Human class I major histocompatibility complex allele HLA-B27 is associated with a group of human diseases called "spondyloarthropathies." Studies on transgenic rats expressing HLA-B27 and human beta 2-microglobulin have confirmed the role of HLA-B27 in disease pathogenesis. Here we report spontaneous inflammatory arthritis in HLA-B27 transgenic mice lacking beta 2-microglobulin (B27+ beta 2m-/...

In the complete graph K2m+3 for m ≥ 2, we study some structures of simple non-isomorphic Hamiltonian sub-graphs of the form H ( 2m+3 , 6m+3) for m ≥ 2 . The various structures of the form H(2m+3, 6m+3) for m ≥ 2 are found and some of them are observed to give some forms of metal atom cluster compound of chemistry . Finally, we establish an algorithm to solve the traveling salesman problem when ...

Near infrared light at 2m is relatively insensitive to the presence of hot young stars and dust in galaxies, and there has been recent interest in using it as a mass tracer in spiral galaxies. I present evidence that young, cool supergiant stars, whose presence is indicated by strong CO absorption in a 2:36m bandpass, dominate the 2m light from active star forming regions in the galaxy NGC 1309...