نتایج جستجو برای: active phase
تعداد نتایج: 1010525 فیلتر نتایج به سال:
The ever increase of nonlinear loads in electric distribution networks causes many problems due to the high level of harmonic currents. This paper proposes a new technique for controlling a single phase shunt active power filter based on a selective compensation using the newly developed technique of harmonic control arrays. Simulation results confirm the appropriate selective harmonic compensa...
An efficient procedure is presented for the evaluation of solid oxide fuel cell (SOFC) anode microstructure triple phase boundary length (TPBL). Triple phase boundary- the one that is common between three phases of the microstructure- has a great influence on the overall efficiency of SOFC because all electrochemical reactions of anode take place in its vicinity. Therefore, evaluation of TP...
This paper presents a novel method to calculate the reference source current and the referencecompensating current for shunt active power filters (SAPFs). This method first calculates theamplitude and phase of the fundamental load current from a recursive algebraic approach blockbefore calculating the displacement power factor. Next, the amplitude of the reference mains currentis computed with ...
objectives: investigating the effect of endurance training program onthe gait pattern of non-active elderly people. methods & materials: this study has been done by a semi-experience method with 23 old men and women by the average and standard deviation of 70/50±6/9 years old (n=14 people of exercise group, n=9 people of control group). the exercise group took part in this program for eight wee...
Introduction & Objective: Decreased labor period can reduce the incidence of cesarean section. The aim of this study was to evaluate the effect of increased hydration on labor in nulliparous pregnant women. Materials & Methods: This randomized double blind clinical trial was done on 180 nulliparous term pregnant women (GA³37weeks), whose active phase of labor had started. They were grouped a...
Background and Aim: Time of hospitalization of women for delivery can have an important impact on the outcome of labor and attention to it could prevent many complications affecting mother and fetus. The aim of this study was to detect the impact of early admission of women in labor and maternal and neonatal outcomes. Materials and Methods: In this descriptive and analytical study , 463 women w...
In this paper a transformerless Static Synchronous Series Compensator (SSSC) to increase the power capacity of a 230 kV transmission line is proposed. In order to eliminate the transformer, a 15-level cascade H Bridge (CHB) inverter is employed within the proposed compensator structure to inject reactive power to the transmission line. The theory of instantaneous p-q power using in the compensa...
Background & Aim: Labor refers to a chain of physiologic events that allows a fetus to undertake its journey from the uterus to the outside. Friedman (1954) described a sigmoid pattern for labor. This study was carried out to compare the pattern of labor progression in nullipara women of Fasa with the Friedman;aposs labor curve. Methods & Materials: This cross-sectional study was conducted amo...
Abstract Traditional railway power supply systems impose substantial power quality problems (PQ) on the utility network, such as unbalance, harmonics and a large amount of reactive power. This paper proposes a topology based on three-phase to single-phase modular multilevel converters (MMC) to obviate these problems. The MMC based traction substations (TSS) are connected directly to the utili...
To discuss the potential role of the support for iridium catalyst, we have proceeded to prepare a series of supported catalysts with the same active phase content, but different silica content, to elucidate the changes in surface structure and the reaction process of hydrous hydrazine decomposition on catalyst. The obtained iridium catalysts contained 20 wt% of nanoparticles dispersed on spheri...
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