Multicomponent and high-boron cast alloys have been recognized as materials with excellent wear resistance due to the formation of hard phases called carbides borides. However, performance combination these two hybrid multicomponent (HMCAs) has not comprehensively studied. Therefore, this study will evaluate effect C (0–0.9 wt.%) B (1.5–3.5 addition on erosion behavior an HMCA containing 2.5 wt...

This paper revealed the variations observed in daily air temperature Makurdi Metropolis, Benue State, Nigeria. The data used here is a 37years (1984-2021) on sourced from National Aeronautics and Space Administration (NASA). Two way Analysis of Variance (ANOVA) model was results that both months, years interaction were all significance (0.000 < 0.05). means metropolis are statistically acros...

! #"$ ! &%! ' ( )+*-,."$ & / ! 102 3 & /4 5 3 6* ,."$ 7& 8 ,. % /, 7 *-) 902 *% : 8 ; % ,.< % % =>, 4 "? % "? @, 0A % *3 5 !, ,1 3B. %C < % /,.7& *5 D @ .,E % @, 0F< , >7 / > /,.7 * 1 ,5BG ! -H I 4 /, 7 *& , BG ! ' * ,."$" 7 : J= < %! ,1 / -* 0C=$ *-*/ * ,. + / ,.%K , % !* ! L ,$ .,5BE M N7 / N, 0O @ /,.7& *-H@P@ % :4 *,. Q R #*-, "$" 7 : J=S 5 $ , 8 3 S T /02, "? * T< 3BG !, 7 8 % 0U, "? 5 !, ...

Let m, k be natural numbers. One can check that RHK(m,k) is real. Let m, k be natural numbers. Then RHK(m,k) is a real number. In this article we present several logical schemes. The scheme ExComplex CASE deals with a binary functor F yielding an element of C, and states that: For every k there exists s1 such that for every n holds if n ≤ k, then s1(n) = F (k,n) and if n > k, then s1(n) = 0C fo...

Geopressured reservoirs can serve as ample source of geothermal energy with temperatures as high as 140 0C. Salinities are typically high in these reservoirs due to the dissolution of surrounding salt domes. Cement retrogression can occur under these geopressured geothermal conditions resulting from calcium silicate hydrate [3CaO2SiO23H2O] phase in hydrated cement converting to alpha dicalciu...

In this study, sedimentary organic matter of oil shale rejects, calschist, shale fine and the so called retorted shale from Irati formation was characterized. EPR was used to analyse the samples regarding loss of signal in g = 2.003 associated to the organic free radical with the calcined samples and washing with hydrogen peroxide. The radical signal was detected in all samples, however, for th...

In this study, effective and easily accessible cheap catalysts that assist converting heavy oil residue to lighter products with high yield are investigated. Hydrocracking experiments were carried out in a 10 ml stainless steel bomb-type reactor up down stirrer at 200 times of reciprocation per minute. The catalyst mixture provided the minimum coke was FeSO4.H2O, binary mixtures FeSO4.H2O metal...