共查询到20条相似文献，搜索用时 31 毫秒
1.
Charles Job 《Ground Water Monitoring & Remediation》1999,19(1):59-61
"This revised program would have significant monitoring burden reduction for ground water supplied systems as compared to the existing program."
"Note that the systems being monitored may total up to 3600, less than one-eighth the number under the existing program." 相似文献
"Note that the systems being monitored may total up to 3600, less than one-eighth the number under the existing program." 相似文献
2.
Michael J. Barcelona 《Ground Water Monitoring & Remediation》1999,19(1):4-6
"It's definitely not a time to become complacent with our current understanding of contaminant fate and transport processes."
"In the coming year, we are going to solicit short one- to two-page field Innovation Notes in GWMR." 相似文献
"In the coming year, we are going to solicit short one- to two-page field Innovation Notes in GWMR." 相似文献
3.
Michael L. Strobel Carissa J. Strobel Geoffrey N. Delin 《Ground Water Monitoring & Remediation》1998,18(4):77-80
"Results indicate that the packer/vacuum system is an adequate method for obtaining values of hydraulic conductivity." 相似文献
4.
"Our experience shows that BTEX ratios, when used cautiously, often provide valuable information on the age of gasoline fuel release." 相似文献
5.
Stuart Cohen 《Ground Water Monitoring & Remediation》1999,19(2):55-56
"The panel provided good, solid, interdisciplinary advice on a variety of challenging, state-of-the-art issues." 相似文献
6.
"Today the environmental professional teams with the developer to use remedial technologies and approaches that complement planned land use and, conversely, use land in a fashion that accommodates environmental site conditions." 相似文献
7.
Stuart Cohen 《Ground Water Monitoring & Remediation》1998,18(4):55-57
"A successful test of such a conservative screening tool would predict concentrations of pesticides that are in the upper 95 to 99% confidence interval of appropriate monitoring results." 相似文献
8.
Evan K. Nyer Eric P. Carman Raymond M. Flynn 《Ground Water Monitoring & Remediation》1999,19(2):61-64
"Hazardous levels of methane in the subsurface occur at numerous locations across the United States." 相似文献
9.
Gary A. Robbins Brent J. Henebry Barbara M. Schmitt Frank B. Bartolomeo Aaron Green Peter Zack 《Ground Water Monitoring & Remediation》1999,19(2):65-69
"Contamination of heating oil with MTBE could result in increasing the environmental impact of subsurface heating oil releases." 相似文献
10.
A. Roger Anzzolin Mary Siedlecki Jennifer Lloyd 《Ground Water Monitoring & Remediation》1999,19(2):57-59
"Valuable information pertaining to contaminant sources, contaminants, and ground water quality was derived using the state-supplied data." 相似文献
11.
Pedro J. J. Alvarez Richard C. Heathcote Susan E. Powers 《Ground Water Monitoring & Remediation》1998,18(4):69-76
"Traces of MTBE in ground water (>10 ppb) do not necessarily indicate recent gasoline contamination." 相似文献
12.
Kevin Donovan 《Ground Water Monitoring & Remediation》1998,18(4):58-60
"EPA has initiated CLEANUP 2000, which includes a number of reforms to the RCRA Corrective Action Program to help increase the pace of cleanups." 相似文献
13.
Until recently main attention was given to the quality methods of the earthquakeprediction.“Anomalies”were selected,which were then connected with known seismic eventsand the forecast was reduced to the detection of these“anomalies”.The new,permittingmathematical and geophysical techniques have appeared to formalize the process of forecastand to save subjective estimation.In the Institute of Seismology under MES RK suchactivities have led up to practical implementation.The new numerical… 相似文献
14.
Laurence L. Quill 《Ground water》1963,1(2):2-48
"Fortunately, this nation is well endowed with water. We get enough precipitation every year to cover the whole country with water 30 inches deep." 相似文献
15.
16.
George C.Lee 《地震工程与工程振动(英文版)》2008,7(4)
We wish to sincerely thank Professor Li Jianzhong of Tongji University and Professor Ian Buckle of the University of Nevada at Reno,for acting as guest editors of our first special issue on the "Seismic Design and Retrofit of Highway 相似文献
17.
本文对某特大跨上承式铁路钢管混凝土拱桥建立“V”型河谷场地有限元动力计算模型,结合时空解耦的时域动力有限元方法,研究“V”型河谷场地效应对其地震响应的影响,并考虑地震入射角、行波速度及地震动峰值等因素对场地效应的影响。结果表明:海拔高且坡度均匀的地形使地震波在反射过程中能量增大,海拔较低且坡度下陡上缓的地形使地震波在反射过程中能量减少,“V”型河谷场地效应使大部分钢管混凝土拱圈截面内力测量值放大作用明显;“V”型河谷场地地形效应与地震波的入射角、行波速度及加速度峰值等因素均有关联,且CFST拱肋面外受弯抗震性能受行波速度的影响较大。因此,钢管混凝土拱桥抗震设计中应注意场地地形效应及行波速度的影响。 相似文献
18.
油气勘探的重点正转向复杂地表条件和复杂地质条件的区域.双复杂条件下的叠前深度偏移方法是解决复杂地表条件和复杂地质构造成像的有效手段,基于"逐步累加"的"直接下延"法和"波场上延"法都是解决复杂地表成像的有效手段.波动方程的频率空间域有限差分深度偏移对介质速度横向变化有较强的适应性,适宜于复杂构造的偏移成像.然而,频率-空间域有限差分法求解时引入的误差影响了成像的质量,我们用了带误差补偿的频率-空间域有限差分偏移改善了起伏地表条件下的频空域有限差分偏移质量,对模型和实际资料进行了试算,得到了较好的成像效果.误差补偿可以在若干个外推步长上进行,通过对比分析,我们发现,相对于基于起伏地表的傅立叶有限差分法偏移来说,该方法在改善起伏地表条件下偏移成像质量的同时,也具有较高的运算效率. 相似文献
19.
2015年4月25日尼泊尔8．1级强烈地震前后,拉萨地磁台(以下简称“拉萨台”)地电场观测数据出现了长时间、大幅度异常变化。在对拉萨台地电场观测条件、观测系统以及观测结果进行初步讨论的基础上,利用“能量合成累加”和“MSA功率谱分析”等数据处理方法,从“时间域”和“频率域”两个方面,对该异常变化的主要特征和演化过程进行了分析。结果显示,尼泊尔8.1级地震前后,拉萨台的地电场观测数据异常变化,经历了“趋势变化一扰动变化一发震期一恢复期”等发展阶段,以及“低频变化一高频变化一平稳变化高频变化”等演化过程。综合分析认为,拉萨台地电场观测异常变化特征和演化过程,与相关现象和机理研究结果基本吻合,能够完整反映强烈地震孕育、发生和发展全过程,是具有一定客观性、典型性和代表性的珍贵资料。 相似文献
20.
Contaminant plume classification system based on mass discharge 总被引：1，自引：0，他引：1
Estimation of mass discharge has become an increasingly valuable analysis technique at sites with contaminated groundwater plumes. We propose a simple plume magnitude classification system based on mass discharge comprised of 10 separate magnitude categories, such as a "Mag 7 plume." This system can be a useful tool for scientists, engineers, regulators, and stakeholders to better communicate site conceptual models, prioritize sites, evaluate plumes both spatially and temporally, and determine potential impacts. 相似文献