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In this paper, the stability equation method is applied to the analysis of nonlinear systems with characteristics equations having complex coefficients. Three types of systems are studied: those with unstable open-loop poles, unstable characteristics roots or an equal number of open-loop poles and zeros. 相似文献
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This paper presents the applications of the stability-equation method to the analysis and design of linear systems. Control systems with multiple inputs and outputs are considered; the absolute stability and relative stability characteristics are analyzed. Stability conditions for control systems with a transport lag or a distributive lag are presented. Finally, the stability characteristics of a system with a distributive parameter are analyzed. 相似文献
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The Walsh operational matrix for performing integration and solving state equations is generalized to fractional calculus for investigating distributed systems. A new set of orthogonal functions is derived from Walsh functions. By using the new functions, the generalized Walsh operational matrices corresponding to √s, √(s2+ 1), e-s and e-√s etc. are established. Several distributed parameter problems are solved by the new approach. 相似文献
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This paper presents the applications of the stability equation method to the analysis and design of nonlinear systems. A simplified criterion for finding the limit cycle in a parameter plane is presented, and a simplified method for testing limit cycle stability is introduced. Several examples, considered in the current literature, are used for illustrating the advantages of the method presented. 相似文献
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This paper presents a new transformation by which the stability-equation method can be applied for analysis and design of sampled-data systems. New stability criteria applicable to systems with transfer function having both real and complex coefficients are presented. Several kinds of examples are considered with computer results given. 相似文献
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Journal self-citation study for semiconductor literature: Synchronous and diachronous approach 总被引：1，自引：0，他引：1
The present study investigates the self-citations of the most productive semiconductor journals by synchronous (self-citing rate) and diachronous (self-cited rate) approaches. Journal’s productivity of 100 most productive semiconductor journals was gathered from INSPEC database, 1978–1997 through OVID. Data of citation frequency were obtained from the Science Citation Index (SCI), Journal Citation Reports (JCR) 2001 CDROM edition by the title-by-title search. The self-citing and self-cited data were drawn from the Citing Journal Listing and the Cited Journal Listing of the JCR CDROM version 1990–2001. Self-citing and self-cited rates were determined by the method suggested by the JCR. Eighty-seven journals common to INSPEC and JCR in semiconductor were selected as the object of this study and were listed for statistical tests. The results of the present study demonstrate that high self-citing journals are usually older than low self-citing journals. In contrast to the self-citing data, the journal self-cited rate is not closely related to the publication year but reflects the characteristics of various journals. Journals with a short time interval of publication are more possible with high self-citing and self-cited rates. Journals with higher self-citing rate tend to be more productive and receive more citation than journals with lower self-citing rate. The journal self-cited rate has no association with the number of articles that a journal published and the citation it received. A journal with a higher self-citing rate tends to be cited more by itself. The mean self-citing rate is 9.59% and the mean self-cited rate is 15.03%. There is a significant difference between self-citing and self-cited rates within the same set of journals. 相似文献
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Distance students' ratings of the importance of strategies to facilitate self‐directed learning were evaluated. Students from an open university in Taiwan (449 current and 140 inactive) participated in this study. Current students scored significantly higher than inactive students on internal motivation, insight about self, and self‐directed learning readiness. A combination of high internal and external motivation and high self‐directed learning readiness predicted ratings of the importance of five sets of strategies for helping students become self‐directed learners. The study provides information to help distance learning professionals enhance the effectiveness of self‐directed learning and reduce the number of students who become inactive. 相似文献
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In this paper, control systems with lags and with distributed-parameters are considered. First, the relation between the stability equation method and the theorem of Pontryagin for testing stability of the zeros of exponential polynomials is considered, then the distributions of roots of double-valued functions are analyzed, and finally the applications of the stability equation method for stability analysis of process control systems are presented. 相似文献
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Both talent and effort are considered essential sources of achievement, but past research suggests a preference for people who appear to achieve through talent. This research examined the potential naturalness preference in 306 Chinese children (Mage: 6.12 years; 164 girls) and 352 adults (Mage: 19.87 years; 182 women) in 2019. In Study 1, participants evaluated a natural or striver protagonist of equal achievement. Children attributed greater competence and warmth to naturals than strivers; adults exhibited this preference only when attributing competence. In Study 2, participants indicated their behavioral preferences between the two protagonists. Children, but not adults, interacted more with naturals than strivers. These findings indicate the naturalness preference emerges early (ds ≥ .27) but declines in strength over time. 相似文献