Long-lead prediction of Indian summer monsoon rainfall from global SST evolution   总被引：1，自引：0，他引：1  

A. K. Sahai  A. M. Grimm  V. Satyan  G. B. Pant 《Climate Dynamics》2003,20(7-8):855-863

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Pressure dependence of melting of metals     

M.M. Pant 《Physics of the Earth and Planetary Interiors》1978,17(2):P14-P15

A relationship between the melting temperature of a metal and its surface energy is used to predict, in a semi-empirical way, the variation of the melting temperature with pressure for sodium. The agreement of the predicted results with the experiments is very good.  相似文献   

Neodymian goyazite in the bauxite deposit of Vlasenica,Yugoslavia     

Prof. Dr. Z. Maksimović  Dr. Gy. Pantó 《Mineralogy and Petrology》1985,34(2):159-165

Summary Electron probe analysis of a bauxite sample with the highest content of the rare earth elements from the Nazda bauxite deposit in the Vlasenica bauxite-bearing area, revealed the presence of neodymian goyazite, a mineral of the crandallite group. Its composition lies between goyazite, florencite and crandallite, and can be described asCn ₂₄Fc₃₃Gz₄₃. The first analyses of this mineral in bauxites are presented and the genesis is discussed.

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Nd-haltiger Goyazit im Bauxitlager von Vlasenica, Jugoslawien

Zusammenfassung Ein Mineral der Crandallitgruppe, Neodym-Goyazit, wurde mittels Mikrosondenanalysen aus dem mit höchsten Gehalten an Seltenen Erden gekennzeichneten Nazda Bauxitlager im Vlasenica Bauxitgebiet identifiziert. Die Zusammensetzung liegt zwischen Goyazit, Florencit und Crandallit und kann mitCn ₂₄Fc₃₃Gz₄₃ angegeben werden. Ein Überblick über die ersten Analysen dieses Minerals von Bauxitlagerstätten und seinen Ursprung wird hiermit gegeben.

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With 3 Figures  相似文献   

On selection and scaling of ground motions for analysis of seismically isolated structures     

Deepak R. Pant  Manika Maharjan 《地震工程与工程振动(英文版)》2016,15(4):633-648

A broader consensus on the number of ground motions to be used and the method of scaling to be adopted for nonlinear response history analysis (RHA) of structures is yet to be reached. Therefore, in this study, the effects of selection and scaling of ground motions on the response of seismically isolated structures, which are routinely designed using nonlinear RHA, are investigated. For this purpose, isolation systems with a range of properties subjected to bidirectional excitation are considered. Benchmark response of the isolation systems is established using large sets of unscaled ground motions systematically categorized into pulse-like, non-pulse-like, and mixed set of motions. Different subsets of seven to 14 ground motions are selected from these large sets using (a) random selection and (b) selection based on the best match of the shape of the response spectrum of ground motions to the target spectrum. Consequences of weighted scaling (also commonly referred to as amplitude scaling or linear scaling) as well as spectral matching are investigated. The ground motion selection and scaling procedures are evaluated from the viewpoint of their accuracy, efficiency, and consistency in predicting the benchmark response. It is confirmed that seven time histories are sufficient for a reliable prediction of isolation system displacement demands, for all ground motion subsets, selection and scaling procedures, and isolation systems considered. If ground motions are selected based on their best match to the shape of the target response spectrum (which should be preferred over randomly selected motions), weighted scaling should be used if pulse-like motions are considered, either of weighted scaling or spectral matching can be used if non-pulse-like motions are considered, and an average of responses from weighted-scaled and spectrum-matched ground motions should be used for a mixed set of motions. On the other hand, the importance of randomly selected motions in representing inherent variability of response is recognized and it is found that weighted scaling is more appropriate for such motions.  相似文献   

Noise Reduction in Long-term Self-potential Monitoring with Travelling Electrode Referencing     

Frédéric?PerrierEmail author  Surendra Raj?Pant 《Pure and Applied Geophysics》2005,162(1):165-179

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Lateral Resolution In Seismic Reflection—A Physical Model Study     

D. R. Pant  S. A. Greenhalgh 《Geophysical Journal International》1989,97(2):187-198

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Numerical study of seismic scattering and waveguide excitation in faulted coal seams     

S.A. Greenhalgh  B. Zhou  D.R. Pant  A. Green 《Geophysical Prospecting》2007,55(2):185-198

Finite‐difference P‐SV simulations of seismic scattering characteristics of faulted coal‐seam models have been undertaken for near‐surface P‐ and S‐wave sources in an attempt to understand the efficiency of body‐wave to channel‐wave mode conversion and how it depends on the elastic parameters of the structure. The synthetic seismograms clearly show the groups of channel waves generated at the fault: one by the downgoing P‐wave and the other by the downgoing S‐wave. These modes travel horizontally in the seam at velocities less than the S‐wavespeed of the rock. A strong Airy phase is generated for the fundamental mode. The velocity contrast between the coal and the host rock is a more important parameter than the density contrast in controlling the amplitude of the channel waves. The optimal coupling from body‐wave energy to channel‐wave energy occurs at a velocity contrast of 1.5. Strong guided waves are produced by the incident S‐sources for source angles of 75° to 90° (close to the near‐side face of the fault). As the fault throw increases, the amplitude of the channel wave also increases. The presence of a lower‐velocity clay layer within the coal‐seam sequence affects the waveguiding characteristics. The displacement amplitude distribution is shifted more towards the lower‐wavespeed layer. The presence of a ‘washout’ zone or a brecciated zone surrounding the fault also results in greater forward scattering and channel‐wave capture by the coal seam.  相似文献