The scheme for the distribution of electric power of the tanker "Ligovsky Prospekt" containing three diesel generator sets with brushless three-phase synchronous generators with an active capacity of 750 kW, a total power of 937.5 kVA, a voltage of 440 V, a frequency of 60 Hz, a rated current of 1203 A, a power factor of 0 ,8. The main power quality indicators and the requirements for them of the IEC and the Russian Maritime Register of Shipping are given. The characteristics two devices "Energotester PKE-06" of domestic production are described with the help of which the main energy indicators (phase and line voltages, phase and linear currents, active, reactive and full power, load power factor, load factor) and power quality indicators (voltage deviation, frequency deviation, non-sinusoidal coefficient and others) on a tank with single operation of dieselgenerator sets (DGA) and with parallel (running, maneuvering, parking in the roadstead) in the electric circuits of generators and receivers (electric drives: electric drive of ballast pump No. 2, power 315 kW, electric drive of inert gas fan, power 126 kW, electric drive of ballast pump No. 1 , the power of 160 kW). The duration of the measurement for running, maneuvering and parking mode in the roadstead was at least 24 hours with 30 minutes averaging. The analysis of power quality indicators based on their measured values and graphical dependencies on time showed the compliance of the quality of electricity with the requirements of the IEC and the Russian Maritime Register of Shipping.
Two elementarily equivalent rings, one of which is lattice-orderable and the other is not lattice-crderable, are constructed.Hence follows the elementary nonclosedness and the nonaxiomatizability of the class of all lattice-orderable rings. This example shows that the class of all lattice-orderable rings is nonaxiomatizable in the class of directedly orderable rings.It is shown in [i] that the class of all linearly orderable rings can be axiomatized. It will be proved here. that the lattice-orderable rings are nonaxiomatizable.For proving this we will construc~ "an example of two elementarily equivalent rings, one of which is lattice-orderable and the other is not lattice-orderable.Let us consider the set of numbers which can be represented in the form k/2n, where k and n are integers.This set is a ring with respect to addition and m~itiplication; we denote it by K:. Let us take the set N of natural numbers and an ultrafilter D on it. We denote the ultrapower of the ring K~ by K2 --KN/D.The usual linear order of the ring KI induces a linear order in the ultrapower K2.Let us consider the algebra over the ring K2 with basis elements a, b, c, and the defining relations :This is an associative and anticommutative algebra. Therefore, by [2, Corollary 9.11], A, and A2 are elementarily equivalent. THEOREM.The ring AI is not lattice-orderable.Proof. Let us assume that ring A~ has a lattice order P. We take an element ~b~N1, where 15 ~ Kz is that element which, under factorization with respect to the ultrafilter, coincides with an element of Cartesian power K N having r-th component 3 r. Then B is "divided" in K2 by an arbitrary power 3 k, where k is a fixed integer, since almost all the components of 13 satisfy this condition, i.e., for each k there exists a ~ (k)~ K~, such that 3k~ (k) = ~. Let l~b[ = ~la %-~,b %-7~c J-k I be the modulus of the element Bb; here ~i, ~i, ~'i K~ and k i~K x. Let us assume that k I ~:0. We now find a power k of the number 3 such that k~ is not divisible by 3 k.. There does not exist any element in K~ which would give kx on multiplication by 3 k. Therefore, the element has no modulus, which is impossible.Thus, k, = 0 and o~1a%-~ib%-y~c~P.Let al = BI = 0.Then ~b~ --~b----?tc.
В работе анализируются некоторые необычные внутри- и межвидовые взаимоотношения ряда видов птиц. Описываются примечательные ситуации из жизни пернатых в гнездовой период. Here we describe some unusual intra- and interspecific behavior of a number of bird species during the nesting period.
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