A bout the time Fred Brooks was warning us there was not likely to be a single, “silver bullet” solution to the essential difficulties of developing software [3], Watts Humphrey and others at the Software Engineering Institute (SEI) were busy putting together the set of ideas that was to become the Capability Maturity Model (CMM) for Software. The CMM adopted the opposite of the quick-fix silve...

We address the problem of multi-objective constraint optimization problems (MO-COPs). Solving an MO-COP traditionally consists in computing the set of all Pareto solutions (i.e. the Pareto front). But this Pareto front is exponentially large in the general case. So this causes two main problems. First is the time complexity concerns. Second is a lack of decisiveness. In this paper, we present t...

Enochs’ conjecture asserts that each covering class of modules (over any fixed ring) has to be closed under direct limits. Although various special cases the have been verified, remains open in its full generality. In this short paper, we prove validity for small precovering classes, i.e., classes form Add(M) where M is module, a mild additional set-theoretic assumption which ensures there are ...

Isolated hafnium (Hf) sites were prepared on Silicalite-1 and SiO2 investigated for acetone conversion to isobutene. Characterization by IR, 1H MAS NMR, UV-vis spectroscopy suggests that Hf atoms are bonded the support via three O have one hydroxyl group, i.e, (?SiO)3Hf-OH. In case of Hf/Silicalite-1, Hf-OH groups hydrogen bond with adjacent Si-OH form (?SiO)3Hf-OH···HO-Si? complexes. The turno...

in this paper, we investigate the existence of a positive solution of fully fuzzy linear equation systems. this paper mainly to discuss a new decomposition of a nonsingular fuzzy matrix, the symmetric times triangular (st) decomposition. by this decomposition, every nonsingular fuzzy matrix can be represented as a product of a fuzzy symmetric matrix s and a fuzzy triangular matrix t.

a organic-solution-processable functionalized-graphene (spfgraphene) material has been studied on pre-concentration and determination of trace mo(ii)ions. in this process, the effects of ph solution, elution conditions on pre-concentration of trace mo(ii) were studied and the effect of interfering ions was also investigated. a selective method for the fast determination of trace amounts of mo (...

an extensive study of higher alcohols synthesis (has) from syngas using alkalized mos2 catalysts supported on carbon nanotubes (cnts) is reported. up to 30wt.% of mo and 8wt.% k are added to the cnts by impregnation method. the catalysts were characterized by different methods and the performance of the catalysts was assessed in a micro-reactor. tem images showed that most of the metal particle...