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杨维芳  杨博雄  傅辉清 《大地测量与地球动力学》2007,27(2):125-127

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蒋锋云  王双绪  张希  张晓亮  薛富平  郑申宝  王继英 《大地测量与地球动力学》2007,27(4):21-30

??1999~2001??2001~2004????????????????嶫???GPS?????????вο?????任??????????????????????????????????????????????????????????????????????????????????????????????????????????????α??λ?????????????????????????任?ο???????????????????????????????????????????????????????????????????????????????????????????????????仯?????????????????????????  相似文献   

常顶瓦斯油吸附法脱除微量氯的实验研究     

李玉明  伦会荣 《山东国土资源》2006,(Z1)

炼油厂将常压塔顶油和减一线油作为重整原料,但由于氯含量过高(30×10-6)无法利用,传统方法是将其中的有机氯转化为无机氯化氢后脱除,但其对加氢催化剂有毒害,采用常顶瓦斯油吸附法可直接脱除微量氯。  相似文献   

Forward simulation of coal fire model by transient electromagnetic method with electrical source     

ZENG Fanjie  SONG Shuanlin  WANG Zhejiang 《世界地质(英文版)》2021,24(4):239-248

Uncontrolled coal fires are natural disasters that may cause mineral loss and environmental damage. The traditional loop source transient electromagnetic method can effectively detect the low-resistivity region of coal fires, but its detection efficiency is not so good for high-resistivity regions. In view of this limitation, a technique based on electrical source transient electromagnetics is proposed in this paper to detect high-resistivity regions in the spontaneous combustion process of coal. Considering the complex geometry of the coal fire area, an unstructured tetrahedral grid is used in this study to realize the spatial discretization of the model, and solve the electromagnetic field based on a vector finite element algorithm. Numerical analysis is used to investigate methods for detecting coal fires and the characteristics of effective anomalies are further examined to provide guidance for practical detection.  相似文献   

威海市近海海域表层沉积物环境质量评价          下载免费PDF全文

吴振  王松涛  印萍  刘金庆 《山东国土资源》2020,36(3):42-49

对威海近海海域127站位表层沉积物中的重金属元素进行分析测试,采用单因子污染指数法、综合污染指数法、超标分类法和潜在生态危害法等多种评价方法对研究区环境质量进行评价。认为研究区海底表层沉积物的单因子污染物指数偏低,只有Cu和Cr两种重金属出现一类沉积物质量超标情况;海底表层沉积物环境质量在整体上处于清洁和尚清洁状态,个别站位处于允许状态;污染类型主要以Ⅰ类、Ⅱ类为主,含少量Ⅲ类,Ⅱ类又分为Ⅱ1Cr和Ⅱ2Cu两个污染亚类,Ⅲ类又分为Ⅲ1Cr-Cu和Ⅲ2Cu-Cr两个污染亚类;各种重金属的生态危害程度均低。  相似文献   

基于周期项参数模型的GPS流动观测改正方法研究     

杨乐  殷海涛  闻燕豪  贾媛 《大地测量与地球动力学》2020,40(10):1012-1016

利用GPS流动观测站200 km范围内站点的连续观测时间序列提高GPS流动观测的定位精度,探讨GPS流动观测结果的可靠性。结果表明：1）流动观测站点速度测量值与连续观测结果差值标准差在改正后平均减小37.97%;2）TAIN、CASH两个站点的同址观测实测值改正后偏离值平均减小38.9%。  相似文献   

青藏高原西部及邻区构造应力场反演和断层滑动趋势分析     

杨颖  解朝娣  徐彦  相传芳  刘本玉 《大地测量与地球动力学》2022,42(7):694-699

基于Global CMT提供的1976-01-01~2015-12-31期间1 255个M_W≥3.5地震的震源机制解,利用FMSI方法对青藏高原西部及邻区（新疆西部地区）应力场进行反演,得到区域应力场特征,并分析西昆仑断裂带及阿尔金断裂带的断层滑动趋势。结果表明,青藏高原西部及邻区的最大主压应力轴σ1整体呈NNE-SSW向,自西向东顺时针旋转;最小主压应力轴σ3整体呈NWW-SEE向。最大主压应力轴σ1倾角大小约为5°~9°,说明该地区的构造应力场以水平运动为主。西昆仑断裂带及阿尔金断裂带具有较强的滑动趋势（T_s≥0.5）,说明西昆仑断裂带及阿尔金断裂带未来失稳滑动的可能性较大。  相似文献   

综合物探方法在焦家断裂南段金矿找矿中的应用          下载免费PDF全文

曹秀华  孟庆旺  曹亚阳 《山东国土资源》2016,32(8)

阐述了综合物探方法在焦家断裂南段金矿找矿中的应用,运用综合物探方法并结合搜集到测区的高精度重力、高精度磁测、常规电法、电磁法、地质、钻孔资料,对焦家断裂南段进行了综合研究,推断了焦家断裂南段的延伸趋势,探讨并总结了测区金成矿规律,圈定并筛选了3处金矿找矿靶区,表现出了较好的综合物探方法运用效果。  相似文献   

Assessment of boundary-element method for modelling a free-floating sloped wave energy device. Part 1: Numerical modelling     

Grgory S. Payne  Jamie R.M. Taylor  Tom Bruce  Penny Parkin 《Ocean Engineering》2008,35(3-4):333-341

The boundary-element method has been widely used as a design tool in the offshore and ship building industry for more than 30 years. Its application to wave energy conversion is, however, more recent. This paper deals with the numerical modelling of a free-floating sloped wave energy device. The power take-off mechanism of the device consists of an immersed tube with a piston sliding inside. The modelling is done using the boundary-element method package WAMIT. The model is first worked out for the case where the axis of the tube is vertical. It is then derived for the tube inclined and successfully verified against numerical benchmark data. A companion paper presents results of a detailed comparison with a physical model study.  相似文献   

Verification of significant wave representation method     

Winyu Rattanapitikon   《Ocean Engineering》2008,35(11-12):1259-1270

The significant wave representation method is the simplest method for computing the transformation of significant wave height across-shore. However, many engineers are reluctant to use this method because many researchers have pointed out that the method possibly contains a large estimation error. Nevertheless, Rattanapitikon et al. [Rattanapitikon, W., Karunchintadit, R., Shibayama, T., 2003. Irregular wave height transformation using representative wave approach. Coastal Engineering Journal, JSCE 45(3), 489–510.] showed that the wave representation method could be used to compute the transformation of root mean square wave heights. It may also be possible to use it for computing the significant wave height transformation. Therefore, this study was carried out to examine the possibility of simulating significant wave height transformation across-shore by using the significant wave representation method. Laboratory data from small- and large-scale wave flumes were used to calibrate and examine the models. Six regular wave models were applied directly to irregular waves by using the significant wave height and spectral peak period. The examination showed that three regular wave models (with new coefficients) could be used to compute the significant wave height transformation with very good accuracy. On the strength of both accuracy and simplicity of the three models, a suitable model is recommended for computing the significant wave height transformation. The suitable model was also modified for better predictions. The modified model (with different coefficients) can be used to compute either regular wave height or significant wave height transformation across-shore.  相似文献