排序方式: 共有17条查询结果,搜索用时 15 毫秒
11.
Abstract Orthodox semigroups have been studied by many authors, in particular by Hall, Yamada and Petrich. In this paper, we give the standard representation of orthodox semigroups and investigate various e-varieties of orthodox semigroups which are determined by the standard representations. 相似文献
12.
Single-electron tunneling (SET) and Coulomb blockade (CB) phenomena have been widely observed in nanoscaled electronics and
have received intense attention around the world. In the past few years, we have studied SET in carbon nanotube fragments
and fullerenes by applying the so-called “Orthodox” theory [28]. As outlined in this review article, we investigated the single-electron
charging and discharging process via current-voltage characteristics, gate effect, and electronic structure-related factors.
Because the investigated geometric structures are three-dimensionally confined, resulting in a discrete spectrum of energy
levels resembling the property of quantum dots, we evidenced the CB and Coulomb staircases in these structures. These nanostructures
are sufficiently small that introducing even a single electron is sufficient to dramatically change the transport properties
as a result of the charging energy associated with this extra electron. We found that the Coulomb staircases occur in the
I–V characteristics only when the width of the left barrier junction is smaller than that of the right barrier junction. In this
case, the transmission coefficient of the emitter junction is larger than that of the collector junction; also, occupied levels
enter the bias window, thereby enhancing the tunneling extensively.
相似文献
13.
Xiang Jun Kong 《代数通讯》2013,41(4):1431-1447
Generalized orthodox transversals are introduced in this article, and some characterizations associated with them are obtained. The related results of Chen on quasi-ideal orthodox transversals obtained in 1999 and Zhang and Wang on generalized inverse transversals obtained in 2008 are generalized and amplified. A structure theorem of a regular semigroup with a perfect generalized orthodox transversal is also established. 相似文献
14.
Yingdan Ji 《代数通讯》2013,41(12):5149-5162
Let S be a finite orthodox semigroup or an orthodox semigroup where the idempotent band E(S) is locally pseudofinite. In this paper, by using principal factors and Rukolaǐne idempotents, we show that the contracted semigroup algebra R0[S] is semiprimitive if and only if S is an inverse semigroup and R[G] is semiprimitive for each maximal subgroup G of S. This theorem strengthens previous results about the semiprimitivity of inverse semigroup algebras. 相似文献
15.
Suohai Fan 《Discrete Mathematics》2002,257(1):161-164
A retraction f of a graph G is an edge-preserving mapping of G with f(v)=v for all v∈V(H), where H is the subgraph induced by the range of f. A graph G is called End-orthodox (End-regular) if its endomorphism monoid End X is orthodox (regular) in the semigroup sense. It is known that a graph is End-orthodox if it is End-regular and the composition of any two retractions is also a retraction. The retractions of split graphs are given and End-orthodox split graphs are characterized. 相似文献
16.
On the Construction of Regular Orthocryptogroups 总被引:1,自引:0,他引:1
Xiang Zhi Kong 《数学学报(英文版)》2002,18(3):517-530
The aim of this paper is to study regular orthocryptogroups. After obtaining some characterizations of such semigroups, we
establish the construction theorem of regular orthocryptogroups. As an application, we give the construction theorem of right
quasi-normal orthocryptogroups and study homomorphisms between two regular orthocryptogroups.
Received September 24, 1999, Accepted May 9, 2001 相似文献
17.