Stator flux oriented vector control of induction motor (IM) drives for speed sensorless control has several advantages. But the application of a pure integrator for the flux estimation is difficult due to the presence of measurement noise and dc offset. To overcome these problems, some have used a programmable cascaded low pass filter (PCLPF). In this paper, it is shown that some problems still...

The article presents the possibility of increasing service life mill lining. Special attention is paid to use rubber linings for mills. A mathematical model asynchronous motor ore grinding mills has been developed, i.e., moment resistance shock. system equations a synchronous plant d and q axes described. Based on modeling operating modes, it was determined that corrosion coating prolongs mill'...

AIM Our objective was to evaluate regional systolic myocardial contraction properties along the long and short axes of the left ventricle (LV) in patients with isolated LV non-compaction (IVNC). METHODS AND RESULTS Pulsed tissue Doppler imaging (TDI) was used to record myocardial velocities along these axes in 25 patients with IVNC (10 asymptomatic-LV ejection fraction [LVEF] > or = 50%; 15 s...

We investigate efficient enumeration algorithms for conjunctive queries for databases over binary relations that satisfy the X property. Tree-like relations such as XPath axes or grids are natural examples of such relations. We first show that the result of an n-ary conjunctive query Q over an X structure S can be enumerated with a delay in O(n·|S|·|Q|) between two consecutive n-tuples. Then, w...

Q |f − fQ|dx < ∞, (1) where |Q| is the n-dimensional Lebesgue measure of Q, fQ = |Q|−1 ∫ Q fdx, and the supremum is taken over all closed cubes Q ⊂ D with sides parallel to the coordinate axes. Let D and D′ be subdomains of Rm and Rn, m, n ≥ 1, respectively. We say that a map F : D → D′ is measurable if F−1(E) is measurable for each measurable subset E of D′. We say that a measurable map F : D ...

This paper deals with the boundary value problem involving the differential equation ell y:=-y''+qy=lambda y, subject to the eigenparameter dependent boundary conditions along with the following discontinuity conditions y(d+0)=a y(d-0), y'(d+0)=ay'(d-0)+b y(d-0). In this problem q(x), d, a , b are real, qin L^2(0,pi), din(0,pi) and lambda is a parameter independent of x. By defining a new...

this paper deals with the boundary value problem involving the differential equation ell y:=-y&apos;&apos;+qy=lambda y, subject to the eigenparameter dependent boundary conditions along with the following discontinuity conditions y(d+0)=a y(d-0), y&apos;(d+0)=ay&apos;(d-0)+b y(d-0). in this problem q(x), d, a , b are real, qin l^2(0,pi), din(0,pi) and lambda is a parameter independent of x. by ...

This paper provides equivalence characterizations of homogeneous Triebel-Lizorkin and Besov-Lipschitz spaces, denoted by $ \dot{F}^s_{p,q}(\mathbb R^n) \dot{B}^s_{p,q}(\mathbb respectively, in terms maximal functions the mean values iterated difference. It also furnishes reader with inequalities difference along coordinate axes. The corresponding axes are considered. techniques used this Fourie...

By single crystal NMR the nuclear quadrupole coupling constants eQ,.h~ (H), the asymmetry parameters >/(H) and the dircetion cosines of the principal axes of the electric field gradient tensors of the H atoms of the two kinds of D 2 0 molecules have been determined at 295 K in RbAl(S04)2 • 1 2 D 2 0 . The results show that the D 2 0 molecules surrounding the ion Al + are "static" within the ...