We present the results of UV spectroscopy of AGNs with double-peaked Balmer emission lines. In 2/3 of the objects, the far-UV resonance lines are strong, with single-peaked profiles resembling those of Seyfert galaxies. The Mg ii line is the only UV line with a doublepeaked profile. In the remaining objects, the far-UV resonance lines are relatively weak but still single-peaked. The latter grou...

The mathematical description of High-altitude Electromagnetic Pulse (HEMP) waveform (E1) in the standard of IEC 61000-2-9 is the difference of double exponentials (DEXP). However, in this description there is a discontinuity of the first derivative at the initial time of waveform. Another analytic waveform description, the quotient of double exponentials (QEXP) has the advantage of all time der...

Hypomethylation of DNA in tumor cells is associated with genomic instability and has been suggested to be due to activation of mitotic recombination. We have studied the methylation patterns in two 650 kb double minute chromosomes present in two mouse tumor cell lines, resistant to methotrexate. Multiple copies of the double minute chromosomes amplifying the dihydrofolate reductase gene are pre...

Warning system effectiveness is critically important in selecting an appropriate emergency warning system to alert to public to potential danger. This paper examines warning system effectiveness in terms of the timing of warning receipt and response. Warning receipt involves the analysis of when warning system information is received, which includes alerting the public and delivering a warning ...

let  be a banach algebra. let  be linear mappings on . first we demonstrate a theorem concerning the continuity of double derivations; especially that all of -double derivations are continuous on semi-simple banach algebras, in certain case. afterwards we define a new vocabulary called “-higher double derivation” and present a relation between this subject and derivations and finally give some ...

landslides are natural disasters that annually inflict great damages to public and private properties which may associate with loss of life. in recent decades, research on developing methods for predicting the time of landslide has been one of the significant attempts made by scientists. since in some type of material, landslides are preceded by undetectable movements that cannot be recorded an...

It is well known that there is an open three-dimensional subvariety Ms of the Grassmannian of lines in P3 which parametrizes smooth irreducible complex surfaces of degree 4 which are Heisenberg invariant, and each quartic contains 32 lines but only 16 skew lines, being determined by its configuration of lines, are called a double 16. We consider here the problem of visualizing in a computer the...

Oil monitoring for wind turbine gearboxes can reflect wear and lubrication conditions, better identify pits on the tooth surface, fatigue wear, other early faults. However, oil with one or several single predicting models brings inaccuracy due to intrinsic merits demerits of models. In this work, fault pre-warning were studied based inspection data three turbines that have been working continuo...