Power Coordinated Control of Micro Sources of MMC Series Microgrid Based on Model Prediction

To improve the utilization rate of micro sources of MMC series structured microgrid in a gridconnected operation mode, a prediction-based coordination control strategy of micro-source power of bridge arm is proposed in this paper. The connection between the output power and the delta carrier is determined by analyzing each generation unit’s output power. Each micro source’s output power is controlled independently by using the carrier-wave variable amplitude phase-shift modulation method. A finite control set-model predictive control algorithm is used to predict the next cycle’s power using the carrier amplitude of the current cycle as the controlled input. The optimal switching state for the next cycle is determined according to the coordination principle of “more work for more energy.” Through simulation, the coordination strategy can effectively control the maximum power output of the bridge arm and improve the micro source’s utilization rate.

Heat Transfer Enhancement and Coordination Optimization for Supercritical CO2 Heat Exchanger

The heat transfer performance of supercritical CO2 (sCO2) in straight and three enhanced tubes were presented firstly, and then a distributed coordination principle was proposed for the design and optimization of heat exchangers. The field synergy principle could explain the thermal-hydraulic performance of sCO2 in different channels very well. The ratio of secondary number to Reynolds number Se/Re could give great predictions for the buoyancy effect. The local heat transfer coefficient also has a lot to do with the near-wall effective thermal conductivity. Zigzag channels with bend angles between 110° to 130° exhibit the best comprehensive performance. With smaller curvature diameter or larger camber, the serpentine channel has better overall performance. Two novel fins were proposed to further improve the performance of PCHE. The heat exchanger performance depends not only on the values of parameters but also on their distributed coordination, which provides a novel approach to heat exchanger optimization of sCO2 through the coordination improvement of distributed parameters.

The Handling of Covid-19 Pandemic in Indonesia from the Perspective of Nonmilitary Defense Strategy

Pandemic coronavirus disease -2019 (COVID-19) resulted in various aspects of the life of Indonesian people, including aspects of defense and security. The defense state classifies threats into military threats, nonmilitary, and combined or hybrid threats. The epidemic of COVID-19 is a non - military threat with a public safety dimension against the national defense. The bureaucracy that has not been properly integrated, sectoral egos, and negative news about the pandemic have become obstacles in the handling of the COV ID-19 pandemic by the Government of Indonesia. This research aims to analyze the simple handling of the pandemic COVID-19 by the Indonesian Government from the perspective of nonmilitary defense principles. This becomes important to unravel and minimize the obstacles faced so that subsequent handling will be more effective and efficient. This paper uses descriptive analysis with a qualitative approach and a literature study. With the theory principles of defense strategy of nonmilitary, the author is looking at steps undertaken by Indonesia Government in handling the pandemic COVID-19. The principle of unity of command, coordination principle, the principle of anticipation, and the principle of transparency still need to be improved in a concrete way so that the handling of the pandemic COVID-19 is effective and efficient, could be reached. Building synergies and integrity policymakers consistently and continuously, inevitability to improve the defense state ability in the face of threats, military, nonmilitary and hybrid threats

PRINCIPLES OF DIGITALIZATION FOR THE CULTURAL HERITAGE PRESERVATION

The paper sets a scientific problem of updating the theoretical foundations for digitalization of the cultural heritage preservation. It carries out an analysis of modern risks that determine the need to modernize approaches to the preservation of cultural heritage and presents the levels, approaches, and tools for preserving cultural heritage in the context of digital transformation of cultural development and cultural practices. The tasks and key areas of applied informatics in culture related to the digitalization of cultural heritage preservation are specified. Principles of digitalization for the cultural heritage preservation are presented in four groups: technological principles, organizational principles, specialized principles of sectoral digitalization, principles of the digitalization projects effectiveness. The group of technological principles includes the compliance with standards, scalability of the applied methods and solutions, and the dialectics principle of universal and professionally oriented IT solutions. The group of organizational principles includes the unity principle for the digital space of culture, the coordination principle for the digitalization of cultural heritage preservation, and the principle of strategic unity. Specialized principles of sectoral digitalization are highlighted due to the nature of economic and digital development in the cultural sphere. The effectiveness principles for the digitalization projects determine the feasibility of investing to digitalization for the cultural heritage preservation. Digitalization of cultural heritage is a combination of new IT solutions, new design of the cultural information space, new relationships in the professional and social environment, and new economic models.

Study on Multi-Scale Coupled Ecological Dispatching Model Based on the Decomposition-Coordination Principle

Studies on environmental flow have developed into a flow management strategy that includes flow magnitude, duration, frequency, and timing from a flat line minimum flow requirement. Furthermore, it has been suggested that the degree of hydrologic alteration be employed as an evaluation method of river ecological health. However, few studies have used it as an objective function of the deterministic reservoir optimal dispatching model. In this work, a multi-scale coupled ecological dispatching model was built, based on the decomposition-coordination principle, and considers multi-scale features of ecological water demand. It is composed of both small-scale model and large-scale model components. The small-scale model uses a daily scale and is formulated to minimize the degree of hydrologic alteration. The large-scale model uses a monthly scale and is formulated to minimize the uneven distribution of water resources. In order to avoid dimensionality, the decomposition coordination algorithm is utilized for the coordination among subsystems; and the adaptive genetic algorithm (AGA) is utilized for the solution of subsystems. The entire model—which is in effect a large, complex system—was divided into several subsystems by time and space. The subsystems, which include large-scale and small-scale subsystems, were correlated by coordinating variables. The lower reaches of the Yellow River were selected as the study area. The calculation results show that the degree of hydrologic alteration of small-scale ecological flow regimes and the daily stream flow can be obtained by the model. Furthermore, the model demonstrates the impact of considering the degree of hydrologic alteration on the reliability of water supply. Thus, we conclude that the operation rules extracted from the calculation results of the model contain more serviceable information than that provided by other models thus far. However, model optimization results were compared with results from the POF approach and current scheduling. The comparison shows that further reduction in hydrologic alteration is possible and there are still inherent limitations within the model that need to be resolved.

Exploring School Nurse Interventions and Health and Education Outcomes: An Integrative Review

School nurses intervene with students, parents, and school staff to advance the health and academic success of students. We conducted an integrative literature review of published research to describe the types of school nurse interventions and health and education outcome measures and to examine how school nurse interventions were linked to student outcomes. Sixty-five studies met the inclusion criteria. We used the National Association of School Nurses’ Framework for 21st Century School Nursing Practice to categorize school nurse interventions and health and education outcome measures. The majority of interventions were categorized under the care coordination principle, most commonly, motivational interviewing and counseling. In 17 studies, school nurse interventions were linked to improved student outcomes. Most studies (80%) were descriptive. To advance school nursing science, researchers can build on this foundation with more rigorous research methods to evaluate the impact of school nurse interventions and activities on student health and education outcomes.