First of all, in this paper, the topology and operation of the three-phase three-level Z-source inverter based on neutral-point-clamped (Z-NPC) are studied. Moreover, different combinations of permissible switching states and control signals are explained for this inverter. In this paper, the topology of the three-phase three-level Z-NPC inverter is extended for an n-level state. Also, a combin...

In this article, we consider the family of functions f meromorphic in unit disk $${\mathbb D}=\{z:\,|z| < 1\}$$ with a pole at point $$z=p$$ , Taylor expansion $$\begin{aligned} f(z)= z+\sum _{k=2}^{\infty } a_kz^k, \quad |z|<p, \end{aligned}$$ and satisfying condition \left| \left( \frac{z}{f(z)}\right) -z\left( '-1\right| <\lambda \qquad \text {for all }z\in {\mathbb D}, for some $$\lambda $$...

H. Wagner, O. Seligmann Institut für Pharmazeutische Biologie der Universität München, Karlstraße 29, D-80330 München Z. Naturforsch. 49 b, 135-140 (1994); received August 30,1993 Euphorbiaceae, Cerebrosides, Structure Five cerebrosides B-l -B-4 were isolated from the fraction B, obtained from the latex of Euphorbia characias L. On the basis of spectral evidences and chemical reactions they wer...

In this paper, we propose a new synchronous stream cipher called SSCQF whose secret-key is   N 1,...z z  S K where i z is a positive integer. Let N d d d ,..., , 2 1 be N positive integers in   1 2 ,..., 1 , 0  m such that i i z d  mod m 2 with m and 8  m . Our purpose is to combine a linear feedback shift registers LFSRs, the arithmetic of quadratic fields: more precisely the unit gro...

A filamentous fungus, Cunninghamella elegans ATCC 9245, was used as a microbial model of mammalian metabolism to biotransform doxepin, a tricyclic antidepressant drug. Doxepin is produced as an 85:15% mixture of the trans- (E) and cis- (Z) forms. After 96 h of incubation in Sabouraud dextrose broth, 28% of the drug was metabolized to 16 metabolites. No change in the trans- (E) and cis- (Z) rati...

In this work, we consider the inverse 3-D heat transfer problem with any fixed n∈ discontinuous heat conductivity coefficients. At first with the help of conservative averaging method, we reduce the considered problem to the 1-D inverse problems. Then we prove the uniqueness theorem for obtained 1-D inverse problem. Key-Words: Heat transfer problem, inverse problem, conservative averaging 1 Mat...

let $r$ be an associative ring with identity. an element $x in r$ is called $mathbb{z}g$-regular (resp. strongly $mathbb{z}g$-regular) if there exist $g in g$, $n in mathbb{z}$ and $r in r$ such that $x^{ng}=x^{ng}rx^{ng}$ (resp. $x^{ng}=x^{(n+1)g}$). a ring $r$ is called $mathbb{z}g$-regular (resp. strongly $mathbb{z}g$-regular) if every element of $r$ is $mathbb{z}g$-regular (resp. strongly $...