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Learning from authoritarian teachers: Controlling the situation or controlling yourself can sustain motivation

100%

Everhart Chaffee K. , Noels K. A. , McEown M. S.

tom 4

nr 2

355-387

Positive psychology encompasses the study of positive outcomes, optimal functioning, and resilience in difficult circumstances. In the context of language learning, positive outcomes include academic engagement, self-determined motivation, persistence in language learning, and eventually becoming a proficient user of the language. These questionnaire studies extend previous research by addressing how these positive outcomes can be achieved even in adverse circumstances. In Study 1, the primary and secondary control scales of interest were validated using 2468 students at a Canadian university. Study 2 examined the capacity of 100 Canadian language learners to adjust themselves to fit in with their environment, termed secondary control, and how it was related to their motivation for and engagement in language learning and their feelings of anxiety speaking in the classroom. Secondary control in the form of adjusting one’s attitude towards language learning challenges through positive reappraisals was positively associated with self-determined motivation, need satisfaction, and engagement. analyses, positive reappraisals were also found to buffer the negative effects of having a controlling instructor on students’ engagement and anxiety. These findings suggest that personal characteristics interact with the learning environment to allow students to function optimally in their language courses even when the teacher is controlling.

Improved dynamic control method for energy storage units in PV dominated microgrids

100%

Wang Q. , Liu Y. , Song W. , Xuan K.

tom Vol. 67, nr 4

885--898

In a PV-dominant DC microgrid, the traditional energy distribution method based on the droop control method has problems such as output voltage drop, insufficient power distribution accuracy, etc. Meanwhile, different battery energy storage units usually have different parameters when the system is running. Therefore, this paper proposes an improved control method that introduces a reference current correction factor, and a weighted calculation method for load power distribution based on the parameters of battery energy storage units is proposed to achieve weighted allocation of load power. In addition, considering the variation of bus voltage at the time of load mutation, voltage secondary control is added to realize dynamic adjustment of DC bus voltage fluctuation. The proposed method can achieve balance and stable operation of energy storage units. The simulation results verified the effectiveness and stability of the proposed control strategy.

Improved dynamic control method for energy storage units in PV dominated microgrids

86%

Wang Q. , Liu Y. , Song W. , Xuan K.

tom 67

nr 4

Wdrożenie w Elektrowni "Adamów" układu umożliwiającego przejmowanie sygnału Y0 regulacji wtórnej systemu elektroenergetycznego

86%

Karczewski J. , Pawlak M. , Szuman P. , Strymer J. , Rybarczyk H.

tom nr 11

536-539

Przedstawiono budowę i opis działania układu przejmowania z regulatora centralnego sygnału Y0. Zaprezentowano wyniki przeprowadzanych w Elektrowni badań, mających na celu sprawdzenie poprawności działania zmodernizowanych UAR.

Presented is the structure and operation description of the system of receiving the Y0 signal from the central regulator. There are shown results of tests carried-out in the power station aimed for checking the operation correctness of the modernised automatic control system.

Modelling and simulation of hydraulic drive system with secondary control.

72%

Dindorf R. , Wołkow J.

tom Vol. 23, nr 4

21-29

The paper presents a dynamic model and results of digital simulation of hydraulic drive system with secondary control. The coefficient influence upon stability of secondary control system and quality indicators of dynamic characteristic are analysed. The modified structural matrices, are used in modelling dynamic of the nonlinear hydraulic secondary control system. The modified structural matrices based upon the concise notation of matrix-vector product in the form of a table which enables ordinary notation of ordinary defferential equations.

W pracy przedstawiono modelowanie dynamiki i wyniki symulacji cyfrowej hydraulicznego układu napędowego z regulacją wtórną. Badano wpływ współczynników na stabilność regulacji wtórnej zastosowano zmodyfikowane macierze strukturalne. W zmodyfikowanych macierzach strukturalnych wykorzystuje się zwięzły zapis iloczynu macierzowo-wektorowego w formie tablicy, z której łatwo jest przejść do zwykłego zapisu równań różniczkowych zwyczajnych.