in a novel dual bed reactor fischer-tropsch synthesis was studied by using two diffrent cobalt catalysts. an alkali-promoted cobalt catalyst was used in the first bed of a fixed-bed reactor followed by a rutenuim promoted cobalt catalyst in the second bed. the activity, product selectivity and accelerated deactivation of the system were assessed and compared with a conventional single bed react...

In this note we consider the notion of intuitionistic fuzzy (weak) dual hyper K-ideals and obtain related results. Then we classify this notion according to level sets. After that we determine the relationships between intuitionistic fuzzy (weak) dual hyper K-ideals and intuitionistic fuzzy (weak) hyper K-ideals. Finally, we define the notion of the product of two intuitionistic fuzzy (weak) du...

we introduce the notions of t-dual rickart and strongly t-dual rickart modules. we provide several characterizations and investigate properties of each of these concepts. it is shown that every free (resp. finitely generated free) $r$-module is t-dual rickart if and only if $overline{z}^2(r)$ is a  direct summand of $r$ and end$(overline{z}^2(r))$ is a semisimple (resp. regular) ring. it is sho...

dual job holding is widespread in iran’s labor market, 18% of work force are holding second job in 1993, which increased to 19% in 2003. using a rich three years panel data-set of socioeconomic characteristics of iranian households, the article aims to examine the determinants of dual job holding across the individuals who have participated in the labor market. since the issue of dual job holdi...

We study the lattice (grid) generated by the incidence vectors of cocycles of a binary matroid and its dual lattice. We characterize those binary matroids for which the obvious necessary conditions for a vector to belong to the cocycle lattice are also sufficient. This characterization yields a polynomial time algorithm to check whether a matroid has this property, and also to construct a basis...

be the minimal number of uniform trees with g-splitting needed to ∀ ∞-cover a uniform tree with f-splitting. c ∃ f ,g is the dual notion for the ∃ ∞-cover. Assuming CH and given ℵ 1 many (sufficiently different) pairs (f ǫ , g ǫ) and cardinals κ ǫ such that κ ℵ 0 ǫ = κ ǫ , we construct a partial order forcing that c ∃ fǫ ,gǫ = c ∀ fǫ ,gǫ = κ ǫ. For this, we introduce a countable support semipro...

Non-adiabatic features around the transition energy are well-known to be one of most important beam physics issues in most of circular hadron accelerators. A novel technique to avoid them by the adiabatic motion, a quasiadiabatic, nonfocusing transition-energy crossing (QNTC), was proposed. In a longitudinally separated function-type accelerator, in which particles are confined by an rf voltage...