Cross sections for (n, 2n), (n, p), (n, a) and (n, n′) reactions on hafnium isotopes around the neutron energy of 14 MeV

Cross sections for 238 U ( n , n ′ γ ) and 238 U ( n , 2 n γ ) reactions at incident neutron energies between 5 and 14 MeV

A. Hutcheson,1,5,* C. Angell,3,5 J. A. Becker,7 A. S. Crowell,1,5 D. Dashdorj,2,7 B. Fallin,1,5 N. Fotiades,6 C. R. Howell,1,5 H. J. Karwowski,3,5 T. Kawano,6 J. H. Kelley,2,5 E. Kwan,1,5 R. A. Macri,7 R. O. Nelson,6 R. S. Pedroni,4,5 A. P. Tonchev,1,5 and W. Tornow1,5 1Department of Physics, Duke University, Durham, North Carolina 27708, USA 2North Carolina State University, Raleigh, North Car...

MNDO Study of Nitrogen Atom Inversion in Piperazine, N,N'-Dimethylpiperazine and N,N'-Dichloropiperazine

MNDO semi-empirical SCF MO calculations are used to study the pyramidal nitrogen atom inversion and configurational equilibria in the title compounds.

$n$-cocoherent rings‎, ‎$n$-cosemihereditary rings and $n$-V-rings

 Let $R$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎A right $R$-module $M$ is called $(n‎, ‎d)$-projective if $Ext^{d+1}_R(M‎, ‎A)=0$ for every $n$-copresented right $R$-module $A$‎. ‎$R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $R$-module is $(n‎, ‎d)$-projective‎. ‎$R$...

A green and highly effective protocol for the synthesis of N,N′-alkylidene bisamides using saccharin-N-sulfonic acid

A green and highly effective solvent-free protocol has been reported for the synthesis of N,N′-alkylidene bisamides via the reaction of arylaldehydes (1 eq.) with primary amides (2 eq.) in the presence of saccharin-N-sulfonic acid (SaSA) as a solid-acid catalyst. The mentioned compounds have been obtained in high yields and short reaction times.

On the Rational Recursive Sequence X_{N+1}=ƔX_{N-K}+(AX_N+BX_{N-K})⁄(CX_N-DX_{N-K})