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171.
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Nguyen Minh Truong Vu Thanh Hang Roger A. Pielke Sr. Christopher L. Castro Koji Dairaku 《Asia-Pacific Journal of Atmospheric Sciences》2012,48(4):433-448
The Mei-yu front system occurring from 23 to 27 June 1999 consists of the Mei-yu front and the dewpoint front, which confine a warm core extending from the eastern flank of the Tibetan Plateau to the west of 145°E. To further understand the synopticscale physical mechanisms associated with the Mei-yu front system, the present study proposes another insight into the physical significance of the x-component relative vorticity (XRV) whose vertical circulation is expected to tilt isentropic surfaces. The XRV equation diagnoses exhibit that the twisting effect of the planetary vorticity (TEPV) is positive along the Mei-yu front and negative in the dewpoint front region, and tilts isentropic surfaces from south to north in the Mei-yu frontal zone. Conversely, the meridional gradient of the atmospheric buoyancy (MGAB) tilts isentropic surfaces in the opposite direction and maintains negative in the regions where the TEPV is positive and vice versa. Thus, the TEPV plays the role of the Mei-yu frontogenesis, whereas the MGAB demonstrates the Meiyu frontolysis factor. Both terms control the evolution of the cross-front circulation. The other terms show much minor contributions in this case study. The present simulations also indicate that the weakening of the upper-level jet evidently induces the weakening of the Mei-yu front and reduces the amplitude of the East Asia cold trough. Furthermore, the impact can also penetrate into the lower troposphere in terms of mesoscale disturbances and precipitation, proving that the upper-level jet imposes a noticeable top-down influence on the Mei-yu front system. 相似文献
174.
《工程测量学》双语教学的实践与评估 总被引:2,自引:0,他引:2
介绍工程测量学双语教学的具体实践过程,对工程测量学双语教学模式及教学效果进行了问卷调查、评估与分析,提出工程测量学双语教学存在的问题和应采取的改进措施。 相似文献
175.
Shakirov R. B. Hung Duong Quoc Syrbu N. S. Anh Le Duc Obzhirov A. I. Borzova O. V. Okulov A. K. Van Nam Bui Van Diep Nguyen Dong Mai Duc Legkodimov A. A. Shakirova M. V. Ponomareva A. L. Bakunina M. S. 《Doklady Earth Sciences》2019,484(2):181-184
Doklady Earth Sciences - This paper reports the results of the third Russian–Vietnamese expedition (V.I. Il'ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of... 相似文献
176.
177.
Yuling Zhang Hong Qian Jiali Wang Chaoqun Si Zhiyu Chen Jiangyan Dang Zhenyi Zhang 《Environmental Earth Sciences》2017,76(2):90
The objective of this paper was to investigate a petroleum-contaminated groundwater site in northeast China. Based on the monitoring and analysis of environmental characteristics of groundwater slightly contaminated with petroleum, microbes were added into the petroleum-contaminated groundwater via single-well and multiple-well models to enhance bioremediation. The effect of enhanced bioremediation was monitored and analyzed, and variations in the environmental characteristics of groundwater containing total petroleum hydrocarbons (TPH) were identified to provide a scientific basis for controlling and remediating petroleum-contaminated groundwater. Findings confirmed that this site was slightly contaminated and TPH levels exhibited a slight decreasing trend. After enhanced remediation, the microbial degradation effect was large, and the TPH concentration significantly reduced. In particular, near the wells treated by bioremediation, the amounts of electron acceptors, such as NO3 ?, Fe3+, and SO4 2?, markedly decreased. The product of the microbial degradation process, HCO3 ?, gradually increased in the treated wells. Activities of the enzyme catechol 1, 2-dioxygenase decreased, while those of catalase increased. Reductions in pH, from 7.4 to 6.1, were recorded, and the groundwater environment became further deoxidized. 相似文献
178.
利用试验资料,对蒸散面积2 m2和4 m2两种尺寸蒸渗计测量蒸散量的差异及原因进行了研究。结果表明:2 m2蒸渗计与4 m2蒸渗计所测蒸散量具有很好的一致性,但2 m2蒸渗计所测蒸散量总体要略偏大,日蒸散量平均偏大4%,月蒸散量平均偏大10%,年蒸散量相对偏大5%;典型天气条件下,2 m2蒸渗计和4 m2蒸渗计所测蒸散量的日变化过程基本相同,小时蒸散量的差异表现为晴天时白天显著偏大、夜晚略有偏小,阴天时白天略偏大、夜晚较接近,雨天时白天、夜晚均非常接近的特征。晴天和阴天时,2 m2蒸渗计比4 m2蒸渗计测量日蒸散量分别偏大1.78 mm和0.12 mm,雨天时偏小0.11 mm;2 m2蒸渗计比4 m2蒸渗计测量蒸散量总体偏大的原因,主要是2 m2蒸渗计土壤温度显著高于4 m2蒸渗计和建造时间不同导致土体内部土壤湿度产生差异。 相似文献
179.
????XPL????Ч?????????HPL??VPL??????????????????м?????????????????????HPL??VPL??????????????HPL??VPL?????????С??9 m??12 m?????????12 m??20 m????????????????????????????????????? 相似文献
180.
基于增量动力分析(IDA)的倒塌易损性分析方法是评估建筑结构抗地震倒塌能力的精细方法,但分析过程比较繁杂且非常费时。为了较快地评估建筑结构的抗地震倒塌能力,首先利用静力非线性(pushover)分析,获得结构倒塌能力的初步估计值aS*,然后将每个地面运动记录调整到aS*,对结构进行动力时程分析,记录结构的动力时程反应,利用IDA的思想得到结构的中值数倒塌谱强度?CTS。该方法与传统的增量动力分析方法相比较,可提高计算效率,计算精度也满足要求。 相似文献