海洋真菌的化学研究     

乐长高  林永成 《华东地质学院学报》2001,24(1):48-51

综述了从海洋真菌中分离出结构新奇、有特殊生物活性和有潜在实用意义的新化合物。  相似文献   

Thermal release characteristics of spallogenic He,Ne, and Ar from the Carbo iron meteorite     

L.E. Nyquist  J.C. Huneke  H. FunkP. Signer 《Earth and Planetary Science Letters》1972

The thermal release patterns of He, Ne and Ar from samples of the Carbo iron meteorite show that virtually no fractionation of³He,⁴He,²¹Ne and³⁸Ar occurs. Thus, conclusions about iron meteorites based on measured noble gas ratios will be unaffected by gas loss, and measurement of these ratios cannot yield information about possible loss. Further, noble gas loss cannot explain the abnormal elemental and isotopic patterns observed in some iron meteorites, notably hexahedrites.  相似文献   

Chemical features of the Luna 16 regolith sample     

N.J. HubbardL.E. Nyquist 《Earth and Planetary Science Letters》1972

The Luna 16 regolith sample differs from Apollo 11, 12 and 14 regolith and basalt samples by having smaller negative Eu and Sr anomalies and nearly chondritic Eu/Sm and Eu/Sr ratios although the overall REE, Ba, Sr and U concentrations are 25 to 45 times chondrites. Major element data, in particular FeO vs. Al₂O₃, show that the Luna 16 regolith sample is composed of materials that follow a quantitatively different Fe/Al variation than do Apollo 11, 12, 14 and 15 samples. The small Eu and Sr anomalies and the displaced Fe/Al variation are two chemical features unique to the Luna 16 regolith sample. The Luna 16 regolith sample can contain little if any of the rock types abundant at Apollo sites, thus indicating that the unique chemical features are typical of local or nearby materials and indicate a separate petrogenetic province for major component rock types of the Luna 16 regolith.  相似文献   

A Round of Growth: The Verdict on New Zealand's Programme of Regional Development?     

R. B. LE  HERON 《New Zealand geographer》1979,35(2):71-79

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2010 Leonard Medal to Hiroshi Takeda     

Laurence E. Nyquist 《Meteoritics & planetary science》2010,45(7):1063-1064

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海洋浮游植物溶解有机碳释放研究进展   总被引：6，自引：0，他引：6  

刘诚刚  宁修仁  郝锵  乐凤凤 《地球科学进展》2010,25(2):123-132

溶解有机碳(DOC)是海洋中最大的有机碳库,其中化学性质不稳定的成分大部分来自海洋浮游植物的释放。简要回顾了浮游植物溶解有机碳释放研究的发展历史,从光合作用合成的溶解有机碳(PDOC)释放占初级生产力的比重,PDOC的化学组成,浮游植物DOC释放的途径与机制,PDOC释放的环境调控,浮游植物群落组成对PDOC释放的影响,以及浮游植物释放DOC对异养细菌的生态意义等方面对相关研究进行了综述和分析。讨论了浮游植物溶解有机碳释放研究的现状和存在的问题,并对PDOC初级生产力测定的推广和相关研究的深化提出建议。  相似文献   

面向交通土建工程的网络化移动勘测办公系统     

乐亚南  杨建中  张献州  黄惠峰  产光杰  莫春 《测绘工程》2014,23(11)

现今的交通土建类大型工程项目数据繁冗复杂。传统的数据处理方式速度慢、精度低,已不能满足大型工程管理的需要。GeoNMOS软件可弥补在大型工程项目中数据处理方面的不足。文中提出网络化移动勘测办公系统的设计理念,着重分析GeoNMOS各个模块的特点及其主要功能。  相似文献   

Advancing process‐based watershed hydrological research using near‐surface geophysics: a vision for,and review of,electrical and magnetic geophysical methods     

D. A. Robinson  A. Binley  N. Crook  F. D. Day‐Lewis  T. P. A. Ferré  V. J. S. Grauch  R. Knight  M. Knoll  V. Lakshmi  R. Miller  J. Nyquist  L. Pellerin  K. Singha  L. Slater 《水文研究》2008,22(18):3604-3635

We want to develop a dialogue between geophysicists and hydrologists interested in synergistically advancing process based watershed research. We identify recent advances in geophysical instrumentation, and provide a vision for the use of electrical and magnetic geophysical instrumentation in watershed scale hydrology. The focus of the paper is to identify instrumentation that could significantly advance this vision for geophysics and hydrology during the next 3–5 years. We acknowledge that this is one of a number of possible ways forward and seek only to offer a relatively narrow and achievable vision. The vision focuses on the measurement of geological structure and identification of flow paths using electrical and magnetic methods. The paper identifies instruments, provides examples of their use, and describes how synergy between measurement and modelling could be achieved. Of specific interest are the airborne systems that can cover large areas and are appropriate for watershed studies. Although airborne geophysics has been around for some time, only in the last few years have systems designed exclusively for hydrological applications begun to emerge. These systems, such as airborne electromagnetic (EM) and transient electromagnetic (TEM), could revolutionize hydrogeological interpretations. Our vision centers on developing nested and cross scale electrical and magnetic measurements that can be used to construct a three‐dimensional (3D) electrical or magnetic model of the subsurface in watersheds. The methodological framework assumes a ‘top down’ approach using airborne methods to identify the large scale, dominant architecture of the subsurface. We recognize that the integration of geophysical measurement methods, and data, into watershed process characterization and modelling can only be achieved through dialogue. Especially, through the development of partnerships between geophysicists and hydrologists, partnerships that explore how the application of geophysics can answer critical hydrological science questions, and conversely provide an understanding of the limitations of geophysical measurements and interpretation. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

An accurate interpolating scheme for semi-Lagrangian advection on an unstructured mesh for ocean modelling     

DANIEL Y. LE ROUX  CHARLES A. LIN  ANDREW STANIFORTH 《地球，A辑:动力气象学与海洋学》1997,49(1):119-138

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PERIPHERALISATION AND INDUSTRIAL CHANGE     

RICHARD LE HERON 《New Zealand geographer》1991,47(2):94-94

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