For sparse QR factorization, nding a good column ordering of the matrix to be factorized, is essential. Both the amount of ll in the resulting factors, and the number of oating-point operations required by the factorization, are highly dependent on this ordering. A suitable column ordering of the matrix A is usually obtained by minimum degree analysis on A T A. The objective of this analysis is...

We consider the production of gravitons via two photon and electron-photon fusion in Kaluza-Klein theories which allow TeV scale gravitational interactions. We show that at electron-positron colliders, the processes ll → ll + graviton, with l = e, μ, can lead to a new signal of low energy gravity of the form ll → ll+missing energy which is well above the Standard Model background. For example, ...

The recently discovered gamma-ray burst (GRB) GRB 060218/SN 2006aj is classified as an X-ray Flash with very long duration driven possibly by a neutron star. Since GRB 060218 is very near ∼ 140 Mpc and very dim, one-year observation by Swift suggests that the rate of GRB 060218-like events might be very high so that such low luminosity GRBs (LL-GRBs) might form a different population from the c...

Circadian rhythm disturbances are observed in, e.g., aging and neurodegenerative diseases and are associated with an increased incidence of obesity and diabetes. We subjected male C57Bl/6J mice to constant light [12-h light-light (LL) cycle] to examine the effects of a disturbed circadian rhythm on energy metabolism and insulin sensitivity. In vivo electrophysiological recordings in the central...

the potassium pools of five major physiographic units of urmia region in western azarbaijan province were studied to investigate the distribution of k forms as a function of clay mineralogy and physiographic units. for this, soil samples from different horizons of ten pedons were selected and analyzed for physiochemical properties, mineralogy of clay fraction, and forms of k. analyses of xrd re...

The detection of GRB 060218 at z=0.033 by Swift within 1.5 years of operation, together with the detection of GRB 980425 at z = 0.0085 by BeppoSAX, suggest that these low-luminosity (LL) GRBs have a much higher event rate than the canonical high-luminosity (HL) GRBs, and they form a distinct new component in the GRB luminosity function. We explore the contribution of this previously neglected G...

We numerically study a $\frac{5}{2}$ fractional quantum Hall system with even number of electrons using the exact diagonalization where both strong Landau-level (LL) mixing and finite width well have been considered adapted into screened Coulomb interaction. With principal component analysis, we are able to recognize compressible-incompressible phase transition in parameter space made magnetic ...

Exposure to high levels of genotoxic stress, such as high-dose ionizing radiation, increases both cancer and noncancer risks. However, it remains debatable whether low-dose ionizing radiation reduces cellular function, or rather induces hormetic health benefits. Here, we investigated the effects of total-body γ-ray radiation on muscle stem cells, called satellite cells. Adult C57BL/6 mice were ...

IDEAL STABILITY STUDIES FOR THREE AND FOUR PERIOD FLEXIBLE HELIACS. The stability properties of two realizations of the flexible Heliac concept presently under construction HI in Australia and TJ-ll in Spain are described. HI and TJ-ll equilibria, calculated by using the VMEC code, are analysed for their stability with respect to Mercier modes and, in the TJ-ll case, to low-n modes. In the heli...