RTK-GPS�����������񶯵Ķ�Ƶ�ʳɷַ���   总被引：2，自引：1，他引：1  

谷川  王丽华  万军 《大地测量与地球动力学》2008,28(2):120-122

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一些海洋动植物区系的真菌分离和抑菌活性初步研究     

李学恭  李秋霞  罗洁  雷晓凌 《广东海洋大学学报》2008,28(1):89-92

从南海海域的鱼类、贝类、海藻以及海泥样品中分离出199株海洋真菌,分属于青霉属、曲霉属和酵母属等9个属,其中以青霉属和曲霉属真菌居多,分别占28.6%和26.8%。以大肠杆菌和金黄色葡萄球菌作为指示菌,筛选出抑菌活性菌株7株,其中2株既抗大肠杆菌又抗金黄色葡萄球菌,4株抗金黄色葡萄球菌,1株抗大肠杆菌。  相似文献   

内蒙古中东部上侏罗统满克头鄂博组划分及时代          下载免费PDF全文

张永清 《地球科学》2021,46(1):162-171

内蒙古自治区中东部满克头鄂博组以流纹质火山碎屑岩为主夹山间湖盆相陆相碎屑岩及少量流纹岩或英安岩.沉积岩中产叶肢介Magumbonia paramecia,Nestoria reticulate,N.xishunjingensis,N.cf.pissoui,Lioestheria sp.;双壳类Ferganoconcha...  相似文献   

地幔柱大辩论及如何验证地幔柱假说   总被引：21，自引：1，他引：20  

徐义刚  何斌  黄小龙  罗震宇  朱丹  马金龙  邵辉 《地学前缘》2007,14(2):1-9

目前关于地幔柱存在与否的争论主要集中在地幔柱学说的三个假设上:(1)起源于地球核幔边界缓慢上升的细长柱状热物质流;(2)热点下具有异常高温地幔;(3)地幔柱是相对静止的。这三个方面的验证需要今后深部地球物理探测、岩石学和古地磁等学科的综合运用和进一步的工作。文中认为,地幔柱学说依然能合理地解释地球上一级地质现象,反对地幔柱的学者过分强调了一些小尺度的与地幔柱理论不符的细节,而小尺度地壳特征显然还受到其他许多因素的影响。可以从以下5个方面来鉴别老地幔柱:(1)大规模火山作用前的地壳抬升;(2)放射状岩墙群;(3)火山作用的物理特征;(4)火山链的年代学变化;(5)地幔柱产出岩浆的化学组成。研究表明,峨眉山大火成岩省满足其中的3到4个指标,因此地幔柱是形成峨眉山玄武岩的主要动力学机制。  相似文献   

Physical identification of static and axially-symmetric vacuum metric tensors     

N. Spyrou  D. Papadopoulos 《Journal of Astrophysics and Astronomy》1992,13(4):327-347

We present a method of a possible physical identification of the static and axially symmetric Weyl-type vacuum γ and nγ metrics. This method, in which no interior solutions of any kind are involved, is based on the comparison of the far-field forms of the γ and nγ metrics, and of the far-field form of the metric tensor due to a bounded gravitating perfect-fluid source given correctly to post-Newtonian accuracy. The parameters of the vacuum solutions are expressed in terms of physical parameters of a prolate fluid source, namely total mass-energy, semiaxes and eccentricity, defined consistently to post-Newtonian accuracy. The results, based on the otherwise arbitrary fluid source, appear physically general. Possible astrophysical candidates for the far-field γ andnγ metrics are proposed, based on the conditions imposed on them by the identification method. The advantages and deficiencies of the identification method are briefly discussed.  相似文献   

超新星1994I的光球相光谱     

章庆  胡景耀  李爱根  王力帆 《中国天文和天体物理学报》1995,(2)

本文给出用北京天文台２．１６ｍ光学望远镜观测的超新星１９９４Ｉ的光球相光谱。这些光谱表现出类似于Ｉｃ型超新星１９８７Ｍ的特征。我们用蒙特卡罗光谱合成模型对４月１０日的光谱做了拟合。采用Ｎｏｍｏｔｏ等人Ｃ＋Ｏ模型的元素丰度及修改过的Ｗ７密度结构，计算的光谱与观测的光谱符合得相当好。计算得到４月１０日，超新星的光球速度约为１０００ｋｍ／ｓ，其黑体温度约为８０００Ｋ。另外，我们的光谱拟合可以为Ｃ＋Ｏ星作为Ｉｃ型超新星的前身星提供证据。  相似文献   

The identification of conceptual hydrological models for surface water acidification     

H. S. Wheater  K. H. Bishop  M. B. Beck 《水文研究》1986,1(1):89-109

Ambiguity in parameter identification represents a potentially serious limitation to the application of models of surface water acidification. Previous work has concentrated on manipulation of two of the three factors affecting model identifiability, namely model structure and estimator properties. A new technique is proposed which uses different modes of response within the data to improve parameter identification. Preliminary results, obtained using the Birkenes model of surface water acidification, appear to show promise. The technique is robust in recovering model parameters from synthetic data, with and without error, and in assimilating problems of structural error.  相似文献   

豫西白术沟组的构造位态及时代问题     

石铨曾 《河南国土资源》1995,(2)

白术沟组以其独特的岩石物理特性而卷入到推覆构造带的特殊部位。本文研究了白术沟组的三种构造位态，确定其主要呈第一种构造位态广泛分布于推覆体内部某次一级逆冲滑脱断层的下部，其上覆逆冲岩席由震旦系栾川群及中元古界官道口群构成，下伏地层为下古生界陶湾群。前人将白术沟组置于栾川群的底部层位，笔者对此提出异议，认为以含磷、铀为特征的白术沟组碳质千枚岩层实与我省北部华北地台区早寒武世辛集组底部含磷铀的碳泥质层为同一层位，同样的地层也见于确山西部的“银洞沟组”及大别山的“商城群”石门冲组含磷层中。  相似文献   

Sensitivity analysis for parameter identification in quasi‐static poroelasticity     

Brice Lecampion  Andrei Constantinescu 《国际地质力学数值与分析法杂志》2005,29(2):163-185

This paper is devoted to the formulation of the direct differentiation method and adjoint state method in quasi‐static linear poroelasticity. We derive the strong and weak formulation of both methods and discuss their solutions using the finite element method. The techniques are illustrated and tested on two numerical examples for the case of isotropic and homogeneous material. The presented formulations can be extended to more complex behaviour in poromechanics. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Single-Link Cluster Analysis, Synthetic Earthquake Catalogues, and Aftershock Identification   总被引：2，自引：0，他引：2  

Scott D. Davis  Cliff Frohlich 《Geophysical Journal International》1991,104(2):289-306

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