We have shown by machine proof that F22 = 22 +1 is composite. In addition, we reenacted Young and Buell's 1988 resolution of F20 as composite, finding agreement with their final Selfridge-Hurwitz residues. We also resolved the character of all extant cofactors of Fn , n < 22, finding no new primes, and ruling out prime powers.

This paper presents a new structure for a six-port reflectometer which due to its simplicity can be implemented very easily in monolithic microwave integrated-circuit (MMIC) technology. It uses nonmatched diode detectors with a high input impedance which are placed around a phase shifter in conjunction with a power divider for the reference detector. The circuit has been fabricated using the F2...

| This paper presents a new structure for a six-port reeectometer which due to its simplicity can be implemented very easily in MMIC technology. It uses non-matched diode detectors with a high input impedance which are placed around a phase shifter in conjunction with a power divider for the reference detector. The circuit has been fabricated using the F20 GaAs process of the GEC-Marconi foundr...

The AMPERA (Atmospheric Measurement of Potential and ElectRic field on Aircraft) electric network was integrated the Falcon 20 (F20) SAFIRE (the French facility for airborne research) in framework EXAEDRE (EXploiting new Atmospheric Electricity Data Research Environment) project. From September 2018, an in-flight campaign performed over Corsica (France) to investigate electrical activity thunde...

Three bacteriophages, f20-Xaj, f29-Xaj, and f30-Xaj, with lytic activity against Xanthomonas arboricola pv. juglandis were isolated from walnut trees (VIII Bío Bío Region, Chile). These lytic bacteriophages have double-stranded DNA (dsDNA) genomes of 43,851 bp, 41,865 bp, and 44,262 bp, respectively. These are the first described bacteriophages with lytic activity against X. arboricola pv. jugl...

1Rheumatology Department, Saint-Antoine Hospital, Paris, France; 2Clinical Department, Institut de Recherche Pierre Fabre, Ramonville, France; 3Rheumatology Department, Erasmus Hospital, Bruxelles, Belgium; 4Rheumatology Department, Nzoz “Nasz Lekarz”, Torun, Poland; 5Department of Orthopaedics, 2nd Medical Faculty, Charles University, Prague, Czech Republic; 6 Department of Traumatology and Or...

This paper is intended to give a survey in the algebraic theory of quadratic forms over fields of characteristic two. The relationship between differential forms and quadratics and bilinear forms over such fields discovered by Kato is used to reduced some problems on quadratics forms to concrete questions about differential forms, which in general are easier to handle. 1991 Mathematics Subject ...