- 更多网络例句与未预报的相关的网络例句 [注:此内容来源于网络,仅供参考]
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In this paper a genetic algorithm four-dimension data assimilation system was applied to the more complex MM5 model, we verify the performance of the genetic algorithm assimilation system, we take the a heavy rainfall process during 04-05, July, 2003 as the experimental research object, and carry out data assimilation experiment of actual observation data, compare the experimental results of the genetic algorithm assimilation system and MM5 adjoint model assimilation system with the experimental results without assimilation, the following is the result:genetic algorithm assimilation system is used not only in a barotropic primitive equation but also in the complex model, MM5, for example, in the ideal experiment the result of the genetic algorithm assimilation system is better than the MM5 adjoint model assimilation system, in the assimilation experiment of actual observation data, whichever assimilation system is used, the initial field of numerical prediction model is effectively improved and the prediction effect of physical field and rainfall are somewhat enhanced.
本文将遗传算法的四维同化系统运用到更复杂的MM5模式中,在理想实验中验证遗传算法同化系统的性能,并以2003年7月4日"南京暴雨"作为研究对象,进行了实际观测资料的同化,并将遗传算法同化系统和MM5伴随模式同化系统得到的结果跟未同化的结果进行了比较,结果如下:遗传算法同化系统不仅可以用在正压原始方程模式上,同样也可以用在MM5等复杂模式上,理想实验证明了遗传算法同化系统优于MM5伴随同化系统,在实际观测资料同化中,采用两种方法的同化系统都能有效地改善数值预报模式的初始场,能在一定程度上提高物理量场和降水量的预报效果。
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Furthermore data assimilation experiments are conducted with MM5 Adjoint-model Assimilation System made by adjoint codes. With a case of heavy rainfall taking place from 00h July 23 to 00h July 24,2002, several numerical simulation experiments of different schemes are performed. The results are as follows. MM5 Adjoint-model Assimilation System not only can improve the initial field effectively and promote the coordination with the model but also can enhance the forecast on the precipitation and other elements. The assimilation of CDW has an improvement on quality of upper wind. The effect of direct numerical simulation with utilizing the CDW to amend the initial field gains the advantage over the one not.
结果表明,MM5伴随模式同化系统能有效改善初始场与模式的协调能力,提高模式对于降水场和其它要素场的预报;使用云导风资料修正初始场后直接模拟的效果比未使用时直接模拟的效果要好,对部分区域的强降水预报精度有一定程度的改善;使用伴随模式同化系统后,加入云导风资料的同化试验对其它要素的改善与直接同化常规资料的效果相比,改善优势不明显,但从各要素的误差来看,对于风场的改善最好。
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The 1-4 order variation law of frequency, energy and distance of MS events before destabilizing can display the change rule of MS events. According to the variation law of the difference of frequency, energy and distance of micro seismic events before destabilizing, the fracture of rock mass can be precisely predicted. This is of great importance for safety of colliery.
微地震事件的距离、能量、频数的一到四阶差分均能够显示微地震事件的变化规律,根据未失稳岩体微震事件距离、频数、能量差分变化规律,能够准确地利用微震监测技术预报岩体破裂,这对于采用微地震监测技术解决矿山井下岩体破坏失稳预报具有重要指导意义。
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There is no solution yet because of the lack of clear recognition of mechanism about landside and no correct quantitative model to be set up.
摘 要 岩质滑坡发生时间的适时超前预报是一个世界性难题,之所以长期不得其解,主要是缺乏对滑坡成生机理的明晰认识和未建立正确的量化模型。
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In recent year, it alse is applied in the prediction of plant disease and pest, but there are still no reports on wheat midge prediction. In this paper, ANN was applied in the prediction of wheat midge.
它主要用于模式识别和图像处理,预测和管理等方面,近年来也逐渐开始应用于病虫害预测预报,但在小麦吸浆虫的预测预报却未见报道。
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NOF being 1 when the event occurrence is not observed but was forecast; 0 otherwise.
当预报发生的事件在观测中未发生,则= 1 ;否则=0 。
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The advance seasonally adjusted insured unemployment rate was 2.0 percent for the week ending Dec. 15, unchanged from the prior week's unrevised rate of 2.0 percent.
经季节性调整后,正在领救济金人数比率预报数据在12月15日结束那周为2.0%,比上周未修正的数据2.0%一样。
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Mid-long-term Seismic Prediction serves the 10-20-year quakeproof and disaster mitigation directly, with remarkable scientific significance and social benefit Systemization and practicability of long-term and short-term seismic prediction had not implemented.
中长期地震预测工作直接服务于10~20年左右的防震减灾工作,科学意义和社会效应十分明显,但受预测时间尺度限制,较长期地震预测和短临地震预报远未达到系统化、和实用化的程度。
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The area threatened by landslide accounts for 1/4 or 1/5 of the area of national land, landslide activity enter new activeness issue on a large scale in recent years,these landslide once happen,will bring unestimated losses.but if we can accurately forecast the time of the landslide 's happ
这些滑坡一旦发生带来的损失将是无法估量的。但是,如果能比较准确地预报滑坡发生的时间,则可采取相应的防治措施,防患于未然,将滑坡灾害造成的损失减少到最低点。基于以上目的,本论文针对滑坡预报中存在的两个关键问题展开了研究,一、如何有效地剔除影响滑坡预报准确度的虚假噪声;二、如何根据各个预测模型的预测结果整合出一条综合信息。在
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Even while the storm was still out at sea, its gusting winds of up to 227 kilometers per hour wreaked havoc across Taiwan as the government warned of possible flash floods and landslides.
台风未登陆时,已在岛内引起了时速达227km 的大风,政府早早的就预报了山洪和塌方的可能。