Due to its high efficiency and low power consumption, switched‐mode power supply (SMPS) represents the development trend of the stabilized voltage power supply. However, tolerance has become one of the key factors in the design of SMPS because of the process fluctuation of electronic components, unstable input parameters of the circuit system, influence of working conditions and environment, and the effect of aging. In order to improve the reliability of SMPS and reduce the manufacturing cost, this paper proposes a reliability analysis and optimization design method based on the tolerance and sensitivity analysis. Finally, this method is applied to the tolerance design for the positive switching power supply of the SMPS circuits, and the optimal tolerance design scheme is obtained. Furthermore, the reliability and probability density curves are evaluated.
For the monotony of the traditional risk evaluation method of electric power communication network, a comprehensive method for evaluating risk of electric power communication network is provided. Starting from the analysis of the operational services, risk status of each link in the network is obtained. Then the link weights are calculated by means of analyzing the importance of link to network from the perspective of topology. Lastly, two risk evaluation indicators which are network risk and degree of risk balancing of network can be calculated by combining link risk and link weight. The comprehensive method for evaluating risk of electric power communication network is more comprehensive and ocular in the analysis of operational risks and risk distribution, and has practical significance and extensive application prospects in risk management.Keywords-electric power communication network, electric services, risk evaluation, link weight, network risk, degree of risk balancing of network
Reduced tillage practices present a tool that could sustainably intensify agriculture. The existing literature, however, lacks a consensus on how and when reduced tillage practices should get implemented. We reanalyzed here an extensive dataset comparing how regular tillage practices (i.e., conventional tillage) impacted yield of eight crops compared to stopping tillage altogether (i.e., no-tillage practice). We observed that aridity and fertilization favored no tillage over conventional tillage whereas conventional tillage performed better under high fertility settings. We further show that the responses are consistent across the crops. Our reanalysis complements the original and fills a gap in the literature questioning the conditions under which reducing tillage presents a viable alternative to common tillage practices.
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