This paper is a further study of two papers [1] and [2], which were related to Ill-Conditioned Load Flow Problems and were published by IEEE Trans. PAS. The authors of this paper have some different opinions, for exam...This paper is a further study of two papers [1] and [2], which were related to Ill-Conditioned Load Flow Problems and were published by IEEE Trans. PAS. The authors of this paper have some different opinions, for example, the 11-bus system is not an ill-conditioned system. In addition, a new approach to solve Load Flow Problems, E-ψtc, is introduced. It is an explicit method;solving linear equations is not needed. It can handle very tough and very large systems. The advantage of this method has been fully proved by two examples. The authors give this new method a detailed description of how to use it to solve Load Flow Problems and successfully apply it to the 43-bus and the 11-bus systems. The authors also propose a strategy to test the reliability, and by solving gradient equations, this new method can answer if the solution exists or not.展开更多
Sugarcane tip borer, Scirpophaga excerpalis Walker, is one of the destructive pests in sugarcane fields. It is distributed in Guangdong, Guangxi and Taiwan provinces of China, and also in Southeast Asia and South Asia...Sugarcane tip borer, Scirpophaga excerpalis Walker, is one of the destructive pests in sugarcane fields. It is distributed in Guangdong, Guangxi and Taiwan provinces of China, and also in Southeast Asia and South Asia. Attractant activities of the crude extract of abdominal tips of the female moth have been studied by REN Da-fang, one of the authors (unpublished data). It has shown that the extract after liquid chromatographic separation revealed attractant activities in field tests. This note describes the chemical structure and field tests of the sex pheromone of this species.展开更多
文摘This paper is a further study of two papers [1] and [2], which were related to Ill-Conditioned Load Flow Problems and were published by IEEE Trans. PAS. The authors of this paper have some different opinions, for example, the 11-bus system is not an ill-conditioned system. In addition, a new approach to solve Load Flow Problems, E-ψtc, is introduced. It is an explicit method;solving linear equations is not needed. It can handle very tough and very large systems. The advantage of this method has been fully proved by two examples. The authors give this new method a detailed description of how to use it to solve Load Flow Problems and successfully apply it to the 43-bus and the 11-bus systems. The authors also propose a strategy to test the reliability, and by solving gradient equations, this new method can answer if the solution exists or not.
文摘Sugarcane tip borer, Scirpophaga excerpalis Walker, is one of the destructive pests in sugarcane fields. It is distributed in Guangdong, Guangxi and Taiwan provinces of China, and also in Southeast Asia and South Asia. Attractant activities of the crude extract of abdominal tips of the female moth have been studied by REN Da-fang, one of the authors (unpublished data). It has shown that the extract after liquid chromatographic separation revealed attractant activities in field tests. This note describes the chemical structure and field tests of the sex pheromone of this species.
