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13 results on '"Wu, Xianhua"'

1. A Data-Driven Intelligent Energy Efficiency Management System for Ships.

Author

Zeng, Xiangming, Chen, Mingzhi, Li, Hongfei, and Wu, Xianhua

Abstract

Shipping carries most of the cargo in international trade, with the fuel cost of ships is the major expense. Much attention has been paid to saving fuel in ship operation. First, to save fuel, an intelligent energy efficiency management system is developed to collect data related to ship energy efficiency. The main engine is the primary fuel-consuming equipment on a ship. It is important to carry out a comprehensive evaluation on the energy efficiency of the main engine. To achieve this goal, an ensemble machine learning approach combining the physics-based empirical model is used to perform a regression analysis on two different indicators. The indicators include the engine shaft power and fuel consumption rate per unit time. Second, the influence of the input features on energy efficiency indicators is analyzed, and some conclusions are drawn. On this basis, a novel trim optimization method based on piecewise regression is suggested, which is helpful to reduce ship resistance. In conclusion, this system can help ship operators to judge whether the main engine and ship are in good working condition and take appropriate measures to save energy for ships. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Studies on the Relationship between Phytoplankton Community Structure and Environmental Factors in Fuxian Lake

Author

Wu Xianhua, Gu Guihua, Wang Yue, Qin Jie, and Xue Yadong

Subjects
geography, geography.geographical_feature_category, biology, Ecology, 010501 environmental sciences, 010502 geochemistry & geophysics, biology.organism_classification, 01 natural sciences, Transition stage, Diatom, Algae, Phytoplankton, Spring (hydrology), Phytoplankton community structure, Environmental science, Water quality, Eutrophication, 0105 earth and related environmental sciences
Abstract

analysis on water quality and phytoplankton community structure was carried out throughout the year of 2015. Nutritional status of Fuxian Lake was evaluated by means of biological evaluation method and TSIM. Results show that, there are totally 8 phylum 66 categories and 101 species of phytoplankton, green alga, diatom, and blue-green algae as major dominant species. With this year, seasonal changes happened in phytoplankton community, green alga and diatom as principals in spring, green alga and blue-green algae as principals in summer, green alga, diatom and blue-green algae as principals in autumn, green alga and blue-green alga as principals in winter. Results of redundancy analysis show that, the greatest influence water quality factor of phytoplankton community structure in Fuxian Lake is SRP concentration. Water quality factors in spring include DO and SRP concentration, TN and SRP concentration in summer, SRP concentration and pH in autumn and winter. Results of eutrophication evaluation show that, evaluation results of biological evaluation method and TSIM are basically the same but there still exist differences. It can be seen by combining with two methods that Fuxian Lake now is still in oligotrophic stage but it has characteristics of poor medium nutritional type in transition stage.

Published
2017

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