Advances in Research on Soil Moisture by Microwave Remote Sensing in China   总被引：2，自引：0，他引：2  

SONG Dongsheng ZHAO Kai GUAN Zhi 《中国地理科学(英文版)》2007,17(2):186-191

Soil moisture is an important factor in global hydrologic circulation and plays a significant role in the research of hydrology, climatology, and agriculture. Microwave remote sensing is less limited by climate and time, and can measure in large scale. With these characteristics, this technique becomes an effective tool to measure soil moisture. Since the 1980s, Chinese researchers have investigated the soil moisture using microwave instruments. The active re- mote sensors are characteristic of high spatial resolution, thus with launch of a series of satellites, active microwave remote sensing of soil moisture will be emphasized. The passive microwave remote sensing of soil moisture has a long research history, and its retrieval algorithms were developed well, so it is an important tool to retrieve large scale moisture information from satellite data in the future.  相似文献   

Efficient gusA transient expression in Porphyra yezoensis protoplasts mediated by endogenous beta-tubulin flanking sequences     

Gong Qianhong  Yu Wengong  Dai Jixun  Liu Hongquan  Xu Rifu  Guan Huashi  Pan Kehou 《中国海洋大学学报(英文版)》2007,6(1):21-25

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Flow–stress coupled permeability tensor for fractured rock masses     

Chuang B. Zhou  Radhey S. Sharma  Yi F. Chen  Guan Rong 《国际地质力学数值与分析法杂志》2008,32(11):1289-1309

In this paper a new analytical model is proposed to determine the permeability tensor for fractured rock masses based on the superposition principle of liquid dissipation energy. This model relies on the geometrical characteristics of rock fractures and the corresponding fracture network, and demonstrates the coupling effect between fluid flow and stress/deformation. This model empirically considers the effect of pre‐peak shear dilation and shear contraction on the hydraulic behavior of rock fractures and can be used to determine the applicability of the continuum approach to hydro‐mechanical coupling analysis. Results of numerical analysis presented in this paper show that the new model can effectively describe the permeability of fractured rock masses, and can be applied to the coupling analysis of seepage and stress fields. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Oxide‐bearing and FeO‐rich clasts in aubrites     

E. B. Rosenshein  M. A. Ivanova  T. L. Dickinson  T. J. McCoy  D. S. Lauretta  Y. Guan  L. A. Leshin  G. K. Benedix 《Meteoritics & planetary science》2006,41(4):495-503

Abstract— We report the occurrence of an oxide‐bearing clast and an FeO‐rich clast from aubrites. The FeO‐rich clast in Pesyanoe is dominated by olivine and pyroxene phenocrysts with mineral compositions slightly less FeO‐rich than is typical for H chondrites. In Allan Hills (ALH) 84008, the oxide‐bearing clast consists of a single forsterite grain rimmed by an array of sulfides, oxides, and phosphides. We consider a number of possible origins. We can exclude formation by melting of oxide‐bearing chondrules and CAIs formed in enstatite chondrites. The Pesyanoe clast may have formed in a more oxidized region of the aubrite parent body or, more likely, is a foreign clast from a more oxidized parent body. The ALH 84008 clast likely formed by reaction between sulfides and silicates as a result of cooling, oxidation, or de‐sulfidization. This clast appears to be the first oxide‐bearing clast from an aubritic breccia that formed on the aubrite parent body. Identification of additional oxide‐bearing clasts in aubrites could shed light on whether this was a widespread phenomenon and the origin of these enigmatic objects.  相似文献   

主成分分析在双壳类软体动物研究中的应用     

关则良  刘东超 《广东海洋大学学报》1992,(2)

用主成分分析方法通过计算机把雌性青蛤的软体部干重和3个生化指标综合为肥满指标和能源物质指标,从而允许用二维图象来显示。14个样品明显地分为碳水化合物为主要贮存能源物质和脂类、蛋白质为主要贮存能源物质两类。两个新指标的累积贡献率达94％。  相似文献   

金属矿床氧化带中铁矿物的演化及其与金次生富集的关系     

马民涛  关广岳 《国土资源》1993,(1)

作为地壳中常见的主要变价元素—铁 ,它与金在内生成矿及表生再富集过程中的关系十分密切。铁在矿床中的分布及铁的硫化物矿物在氧化过程中演化的阶段性与环境的Eh值,pH值有着密切关系;进而影响和控制了金在表生演化过程中的地球化学行为。  相似文献   

使用量化器件获得高精度测量方法的几点讨论     

荣维辛  官子美  张柏荣 《天文研究与技术》1995,(3)

本文从列阵器件测量精度的估计公式出发，推导了用低精度Ａ／Ｄ变换器件获得高精度测量结果的一般性证明，还讨论了这种方法的若干可能应用。  相似文献   

A Simple Shear Model for the Asymmetry in the Paleoproterozoic Fold Belt in Liaodong Peninsula   总被引：1，自引：0，他引：1  

Cui Yingchun  Liu Junlai  Ma Lijie  Guan Huimei 《东北亚地学研究》2001,(1)

IntroductionThe Liaodong Paleoproterozioc fold belt is locat-ed at eastern China -- Korea craton, from Liaodongpeninsula through southern Jilin to north Kore$tothe east, to west Jiaodong peninsu1a to the west. Al-though many discussions, in the literature…  相似文献   

扇贝氨基多糖的红外光谱分析   总被引：1，自引：0，他引：1  

王长云  管华诗 《海洋湖沼通报》1994,(3):39-44

从海湾扇贝中提取出具有抗凝活性的氨基多糖，其中，氨基己糖含量为２２．６０％，己糖醛酸含量为２３．３０％，含硫量为６．６６％。样品经ＫＢｒ压片，于１０ＤＸ－ＦＴＩＲ红外光谱仪中进行光谱扫描，发现，该多糖具有典型的氨基多糖红外光谱，分子中含有－ＮＨ，－ＣＯＯ，－ＯＳＯ３＾－等氨基多糖特征基团。与氨基多糖标准品－肝素，６－硫酸软骨素和透明质酸的红外光谱进行比较分析，表明，扇贝氨基多糖与肝素的红外光谱相似  相似文献   

因子分析法在密鲴生殖力研究中的应用     

关则良  陈刚 《广东海洋大学学报》1992,(2)

应用因子分析法研究密鲴繁殖力与诸因素的关系。六个变量是体长、体重、成熟系数、绝对怀卵量和相对怀卵量。29个样本、经正交变换得到3个因子:绝对繁殖因子、相对繁殖因子和成熟因子。  相似文献