由近期无线输电的发展来看,微波无线输电的成功实验有效推动了太空太阳能发电领域的进步。无线输电技术受到世界各国的普遍重视,正式因为人类伟大的发明和创造能力,才能推动科技的不断进步。尽管在无线输电技术的发展道路上必然会存在各种需要攻破的难题,但正是因为前景的广泛性,才推动我们不断探索,相信无线输电技术在未来能有长足的发展。
Flood forecasting coupled with precipitation forecast information can prolong forecast horizon,thus pre-cious time is obtained to make decisions for flood control operation. However,flood forecasting based on the results of “single” precipitation forecast suffers from high uncertainty,which results from the uncertainty of precipitation forecast information. While ensemble precipitation forecasts can handle the uncertainty of precipitation forecast. Thus,to apply the ensemble forecast to flood forecasting,this paper takes the upstream of Huanren reservoir as study basin. And the ensemble precipitation forecasts of ECMWF are adopted to drive the Xin’anjiang model for flood forecasting. Using the forecasting results,more inflow information should be obtained by decision-makers. The result demonstrates that ensemble precipitation forecasts of ECMWF are useful for flood forecasting,and can describe the uncertainty of flood processes. According to the characteristics of ensemble average precipitation, the data have been revised, and used to drive hydrological models. Thus, the forecasting accuracy has been improved greatly.
坚强智能电网是未来电网的发展趋势,而信息平台是支撑坚强智能电网建设的重要基础。为了充分利用计算资源,满足智能电网对全部信息的可靠存储和高效管理的需要,基于云计算的智能电网信息平台应运而生。文章从云计算和智能电网的基本概念出发,论述了二者紧密联系的部分以及未来的机遇和挑战。
日本在微波无线输电技术方面实现了新的突破,这意味着人类可能实现大规模、中长距离的无线输电,同时也推动了太空太阳能发电输送到地球这一设想的实现。
Ensemble prediction is an important development direction of numerical prediction.Compared with the single deterministic prediction,the ensemble prediction considers the uncertainties associated with the initial conditions and models,and its results can reflect different possible weather conditions in the future and therefore the ensemble prediction can provide the information which the deterministic prediction cannot(e.g.,the reliability of the forecast).Precipitation information is the core input of the hydrological forecast.The uncertainty of the single precipitation forecast leads to the uncertainty of the hydrological forecasting,which restricts the scientific values of the regulation of the water conservancy project.However,the ensemble forecast can solve the uncertainty to some extent,and thus the weather ensemble prediction is valuable for the practical application in the hydrological field.In order to help the hydrologists better apply the ensemble prediction,this paper reviews the current research status and achievements of the initial disturbance,model disturbance,and products of ensemble prediction based on the point of view of prediction system.The application of the products of precipitation ensemble prediction in the field of hydrological forecast is then analyzed.Finally,the outlook of the application of ensemble forecast in the field of hydrological prediction is presented.
Encounter to the characteristics of the reheating furnace with non-linearity,slow time-variant and large delay,the bi-fuzzy control with self-tuning factor and proportional-integral-tuning unit is proposed to obtain the tactics of the feeding module trace and to optimizes the control rule by adjusting factors.The actual application proves that the control has the advantage of quicker response and stronger robust,and then achieves good control quality.The control effect is much better than that of the conventional(PID) and single fuzzy controller.
In the paper,a combined number generator based on the method of Mersenne Twister and prime modulo multiplicative linear congruence generators is proposed.At present,combined generator theory is in-depth only for linear congruence.Try to combine two type of generators,then a new method of combined generator can be achieved.The experiments show that the combined generator obtained has more superior statistical characteristics.Good uniformity and independence will be achieved.
Based on the MT generator,a new random number generator was developed by means of,firstly,improving the recurrence mode in MT,and there combining the attained generator with LCG.The new random numeral sequence obtained possesses more superior statistical characteristics,and its period is the same as that in MT algorithm,which can be regarded as infinite.It can effectively satisfy the computation demands of Monte Carlo simulation.