Sensitivity of the IAP two-level AGCM to surface albedo variations   总被引：3，自引：0，他引：3  

Z. -H. Lin  Q. -C. Zeng  Bing Ouyang 《Theoretical and Applied Climatology》1996,55(1-4):157-162

Summary Two numerical experiments were performed for sensitivity study of surface albedo, one was a control run in which the albedo values for snow-free surfaces were prescribed as constant; the other was a sensitivity run in which an albedo with seasonal variation was incorporated into the model show that the simulation of precipitation is sensitive to the surface albedo variations, especially those over Eastern Asia and the Sahara. Changes in surface albedo also have an impact on the monthly mean sea level pressure, especially on the July-mean Western Pacific subtropical high. Surface air temperature decreased over most of the Eastern Asia but increases over most of the Antarctica in July.With 6 Figures  相似文献   

极谱法在测井中的应用研究     

赵秋梅  温佩琳  肖兵 《物探与化探》1996,20(5):365-368,373

在物探测井工作中,一般的测量参数是电阻率、激化率、磁化率等。测量参数少是造成反演解释多解性的原因之一。本文旨在提出一个新的测井方法──极谱测井,从而提供一个新的测井参数──井液中金属离子的浓度。本文在阐述了极谱法的基本原理的基础上,进行了大量的模拟实验;通过分析实验结果,证实了极谱测并的可行性、有效性和快速性。  相似文献   

石墨炉原子吸收法测定地质样品中痕量银     

王兵  唐良宝 《铀矿地质》1996,12(3):180-184

本文介绍了采用硝酸、氢氟酸、高氯酸溶解试样，在５％的盐酸介质中，不经分离，直接测定地质样品中痕量银。银的检出限为５ｎｇ／ｇ，方法灵敏度２．０×１０－１２，相对标准偏差为４％，回收率９５％－１１５％。  相似文献   

The numerical method of Fourier eigen transform and its application in seismicity analysis     

陈兵  郑治真  江在森 《地震学报(英文版)》1997,10(6):753-759

ＴｈｅｎｕｍｅｒｉｃａｌｍｅｔｈｏｄｏｆＦｏｕｒｉｅｒｅｉｇｅｎｔｒａｎｓｆｏｒｍａｎｄｉｔｓａｐｐｌｉｃａｔｉｏｎｉｎｓｅｉｓｍｉｃｉｔｙａｎａｌｙｓｉｓＢＩＮＧＣＨＥＮ１）（陈兵）ＺＨＩ－ＺＨＥＮＺＨＥＮＧ２）（郑治真）ＺＡＩ－ＳＥＮＪＩＡＮＧ...  相似文献   

岩体结构随机模型模拟方法   总被引：5，自引：0，他引：5       下载免费PDF全文

徐继先  许兵  王思敬 《地质科学》1988,(3):272-282

本文论述利用勘探平硐资料研究岩体结构面分布规律及进行岩体结构面随机模型模拟方法。文中首先论述了描述结构面空间分布规律的五个几何参数,即产状、形态、规模、密度和张开度及其相应的概率分布型式;其次简单的介绍了 Monte-Carlo 方法在模拟结构面分布中的应用;最后结合三峡工程实例,论述了利用坝基勘探平硐编录图及现场记录估计结构面产状、迹线长度、中点密度分布参数的方法,并且给出了在参数估计基础上进行 Monte-Carlo模拟的部分结果。本文为岩体结构力学分析提供了一个定量的结构模型。  相似文献   

扰动与基本带状环流非线性相互作用的实验研究     

欧阳兵 《大气科学》1989,13(1):29-37

本文用转盘实验的方法,研究了均质正压流体运动中扰动与基本带状环流的非线性相互作用。着重考察了两类典型初始扰动场——即迭加在基流上的槽状扰动和多闭合涡旋中心扰动结构的演变过程。发现:非线性相互作用过程是以波动形式表现的。两类初始扰动场各自经历不同的演变过程,并趋向于不同的平衡态。槽状扰动结构有利于基流对扰动动能的吸收,流场最终趋向于轴对称带状环流状态,而且纬向波数越大,吸收过程越明显。多闭合涡心结构不利于基流对扰动动能的吸收。基流与扰动在动能随时间的变化上表现出准周期性振荡。实验结果与旋转适应过程理论有很好的一致性。  相似文献   

正态分布函数在层次分析法判断矩阵建立中的应用     

陈桥  胡克  刘玉英  李福来  陈兵 《吉林大学学报(地球科学版)》2004,(Z1)

层次分析法判断矩阵中任一元素值的确定是众多调查专家意见的综合,而在运用此法的实践中,专家意见往往参差不齐且存在很多误判值,如果这些误判值也参与矩阵元素值的确定中,将会使判断矩阵建立偏离轨道。根据正态分布函数特性,通过一定的数学模型,提出了叠代法,将误判值剔除方法,从而使判断矩阵的构建更加科学,更具有可操作性。  相似文献   

电感耦合等离子体光谱／质谱法测定环境样品中的硼   总被引：7，自引：3，他引：7  

杨红霞  马新荣  李冰  孙德忠 《岩矿测试》2004,23(4):273-277

采用HF-HNO3-H3PO4-HClO4密封溶样处理样品,电感耦合等离子体光谱/质谱法(ICP-AES/MS)测定农作物、膳食和粪便中的硼。所拟定的方法在测硼的同时,还可测定Cr、Cu、Li、V、Co、Zn、Sr、Cd、Ba、K、Na、Fe、Mn、Zn元素,可以为农作物和饮食中痕量元素研究提供参考。ICP-AES测定硼的方法检出限(3σ)为0.0063μg/mL,测定限(10σ,DF=100)为2.10μg/g;ICP-MS测定硼方法检出限(3σ)为0.0228ng/mL,测定限(10σ,DF=1000)为0.092μg/g。方法经植物国家一级标准物质GBW07602～07605验证,测定值与标准值接近,样品10次测定的RSD<10%。  相似文献   

A numerical comparison of 2D resistivity imaging with 10 electrode arrays   总被引：9，自引：0，他引：9  

Torleif Dahlin  Bing Zhou 《Geophysical Prospecting》2004,52(5):379-398

Numerical simulations are used to compare the resolution and efficiency of 2D resistivity imaging surveys for 10 electrode arrays. The arrays analysed include pole‐pole (PP), pole‐dipole (PD), half‐Wenner (HW), Wenner‐α (WN), Schlumberger (SC), dipole‐dipole (DD), Wenner‐β (WB), γ‐array (GM), multiple or moving gradient array (GD) and midpoint‐potential‐referred measurement (MPR) arrays. Five synthetic geological models, simulating a buried channel, a narrow conductive dike, a narrow resistive dike, dipping blocks and covered waste ponds, were used to examine the surveying efficiency (anomaly effects, signal‐to‐noise ratios) and the imaging capabilities of these arrays. The responses to variations in the data density and noise sensitivities of these electrode configurations were also investigated using robust (L₁‐norm) inversion and smoothness‐constrained least‐squares (L₂‐norm) inversion for the five synthetic models. The results show the following. (i) GM and WN are less contaminated by noise than the other electrode arrays. (ii) The relative anomaly effects for the different arrays vary with the geological models. However, the relatively high anomaly effects of PP, GM and WB surveys do not always give a high‐resolution image. PD, DD and GD can yield better resolution images than GM, PP, WN and WB, although they are more susceptible to noise contamination. SC is also a strong candidate but is expected to give more edge effects. (iii) The imaging quality of these arrays is relatively robust with respect to reductions in the data density of a multi‐electrode layout within the tested ranges. (iv) The robust inversion generally gives better imaging results than the L₂‐norm inversion, especially with noisy data, except for the dipping block structure presented here. (v) GD and MPR are well suited to multichannel surveying and GD may produce images that are comparable to those obtained with DD and PD. Accordingly, the GD, PD, DD and SC arrays are strongly recommended for 2D resistivity imaging, where the final choice will be determined by the expected geology, the purpose of the survey and logistical considerations.  相似文献   

天然气水合物合成实验数据采集系统的设计          下载免费PDF全文

李兵  宁伏龙  关进安  蒋国盛 《探矿工程》2004,31(10):36-38

介绍了PCI-1711数据采集卡的性能，结合天然气水合物合成实验数据采集系统介绍了如何通过PCI-1711来进行数据采集和设备控制。  相似文献