This is an updated version of [1]. In the design presented there the horizontal emittance of the extracted beam is too large by about 20%. In order to get the emittance down to the required value the quadrupole magnets in the dispersive regions in the ring are moved to provide J_x=1.1 which gives a small enough emittance. In addition a better model of the wiggler fields is used. The new design ...

in this work, we investigate the transfer of some homological properties from a ring $r$ to its amalgamated duplication along some ideal $i$ of $r$ $rbowtie i$, and then generate new and original families of rings with these properties.

for a ring endomorphism $alpha$ and an $alpha$-derivation $delta$, we introduce a concept, so called skew $pi$-armendariz ring, that is a generalization of both $pi$-armendariz rings, and $(alpha,delta)$-compatible skew armendariz rings. we first observe the basic properties of skew $pi$-armendariz rings, and extend the class of skew $pi$-armendariz rings through various ring extensions. we nex...

Increasingly organizations compete based on time. As a result, cycle-time reduction is a key agenda for organizations interested in achieving increased customer service and reduced cost. With improved cycle time, organizations can often eliminate or reduce inventory while expanding customer service offerings. The purpose of this tutorial is to present the fundamental concepts of cycle time redu...

Research shows that continuing competitive pressure applied during development and production leads to better industry performance, often at reduced cost. However, the entrenched practice of one-time competition for an entire program life-cycle often endows the winner with a very strong monopolistic power that lasts for decades. This paper describes continuous competition as leverage to acquire...

in this paper, we introduce the new notion of n-f-clean rings as a generalization of f-clean rings. next, we investigate some properties of such rings. we prove that mn(r) is n-f-clean for any n-f-clean ring r. we also, get a condition under which the de nitions of n-cleanness and n-f-cleanness are equivalent.

a topoframe, denoted by $l_{ tau}$,  is a pair $(l, tau)$ consisting of a frame $l$ and a subframe $ tau $ all of whose elements are complementary elements in$l$. in this paper, we define and study the notions of a$tau $-real-continuous function on a frame $l$ and the set of realcontinuous functions $mathcal{r}l_tau $ as an $f$-ring.we show that $mathcal{r}l_{ tau}$is actually a generalization ...

for a fixed positive integer , we say a ring with identity is n-generalized right principally quasi-baer, if for any principal right ideal of , the right annihilator of is generated by an idempotent. this class of rings includes the right principally quasi-baer rings and hence all prime rings. a certain n-generalized principally quasi-baer subring of the matrix ring are studied, and connections...