The geology of Malta and Gozo     

H.M. Pedley  M.R. House  B. Waugh 《Proceedings of the Geologists' Association. Geologists' Association》1976,87(3):325-341

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Phosphorus and dissolved silicon dynamics in the River Swale catchment,UK: a mass‐balance approach     

M. J. Bowes  W. A. House 《水文研究》2001,15(2):261-280

The internal riverine processes acting upon phosphorus and dissolved silicon were investigated along a 55 km stretch of the River Swale during four monitoring campaigns. Samples of river water were taken at 3 h intervals at sites on the main river and the three major tributaries. Samples were analysed for soluble reactive phosphorus, total dissolved phosphorus, total phosphorus, dissolved silicon and suspended solid concentration. Mass‐balances for each determinand were calculated by comparing the total load entering the river with the total load measured at the downstream site. The difference, i.e. the residual load, showed that there was a large retention of phosphorus and silicon within the system during the March 1998 flood event, but the other three campaigns produced net‐exports. Cumulative residual loads were calculated for each determinand at 6 h intervals throughout each campaign. This incremental approach showed that the mass‐balance residuals followed relatively consistent patterns under various river discharges. During stable low‐flow, there was a retention of particulate phosphorus within the system and also a retention of total dissolved phosphorus and soluble reactive phosphorus, most likely caused by the sorption of soluble phosphorus by bed‐sediments. In times of high river‐discharge, there was a mobilization and export of stored bed‐sediment phosphorus. During overbank flooding, there was a large retention (58% of total input) of particulate phosphorus within the system, due to the mass deposition of phosphorus‐rich sediment onto the floodplain. Soluble phosphorus was also retained within the system by sequestration from the water column by the high concentration of suspended solids. The dissolved silicon mass‐balance residuals had a less consistent pattern in relation to river discharge. There was a large retention of dissolved silicon during overbank flooding, possibly due to sorption onto floodplain soil, and net‐exports during periods of both stable low‐flow and rising limbs of hydrographs, due to release of dissolved silicon from pore‐waters. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

Introduction     

F. C. House  K. A. Innanen  D. W. Keenan 《Celestial Mechanics and Dynamical Astronomy》1975,11(1):3-11

Seven algorithms are investigated for integrating stellar orbits in axisymmetric and time-independent galactic models. We find that for this purpose, impressive gains over older methods are possible with higher order Runge-Kutta methods and variable order methods.  相似文献   

Vector magnetic fields in prominences     

Lewis L. House  Raymond N. Smartt 《Solar physics》1982,80(1):53-69

A preliminary discussion is presented of measurements of the polarization of the He i D₃ multiplet in a quiescent prominence, observed with a wavelength-scanning Stokes polarimeter. For a series of 43 observations in the same prominence, the linear polarization of the major component of D₃ lies primarily in the range 1 to 2% and of the wing component, the range 2 to 5%; the polarization vector angle lies primarily in the range 10–25° for the major component, and 25–35° for the other component. From a more limited data set, the polarization of both components is found to first increase as a function of height in the prominence, and then to decrease; the polarization angles of the major component vary in a random-like way with height, while the wing component shows a systematic change. The amount of polarization and the angle of polarization are governed by the Hanle effect. The collective effect of the group of lines at the peak of D₃ evidently has a different sensitivity to the Hanle effect than does the wing component, thus yielding at least four independent measurements - two polarizations and two angles. With some redundancy, the vector magnetic field can then be established using the detailed theory of the Hanle effect. Since the wing component of D₃ is a simple triplet, an initial estimate of the magnetic field strength and its horizontal orientation, 0, relative to the line of sight, is simply obtained. Examples of such calculations are presented.The National Center for Atmospheric Research is sponsored by the National Science Foundation.Operated by the Association of Universities for Research in Astronomy, Inc. under contract AST 78-17292 with the National Science Foundation.  相似文献   

An empirical test of helium diffusion in apatite: borehole data from the Otway basin, Australia   总被引：5，自引：0，他引：5  

Martha A House  Kenneth A Farley  Barry P Kohn 《Earth and Planetary Science Letters》1999,170(4):543-474

We have analyzed helium ages of apatites from several boreholes in the Otway basin, Australia, to evaluate whether laboratory helium diffusivity can be accurately extrapolated to conditions relevant in nature. Downhole apatite helium ages define a broad swath of values from 78–71 Ma at the surface (15°C) to nearly zero at depths corresponding to ambient temperatures of 80°C. The width of the swath results from uncertainties in corrected borehole temperatures, differences in the thermal history experienced by the various boreholes, and possibly from slightly different helium diffusivities among the detrital apatite grains studied. In the eastern Otway basin, the shape and position of the helium age profile is in good agreement with predictions based on the extrapolation of laboratory diffusivity data for Durango apatite coupled with published thermal histories for this part of the basin. In contrast, helium ages are much younger than predicted in the western Otway basin. Based on measured ages from Otway sediments, which have been essentially isothermal over the last few million years, an empirical diffusivity (D/a²) of 2×10⁻¹⁵ s⁻¹ can be assigned to apatites residing at downhole temperatures of 67–97°C. This empirical diffusivity is consistent with laboratory diffusion measurements, demonstrating that such measurements are reasonably accurate and can be applied with confidence to natural geologic settings. Given this confirmation of the laboratory diffusivity data, the discrepancy between the observed and modeled helium age profiles in the western Otway basin suggests that these sediments recently experienced higher temperatures than presently supposed.  相似文献   

统一地理信息服务在土地管理信息系统建设中的应用     

刘峰 《国土资源信息化》2010,(1):50-54

统一地理信息服务是上海市规划和国土资源统一应用支撑平台的重要组成部分,本文对它的结构和功能进行了描述,并介绍了它在应用系统建设中起的作用。  相似文献   

以信息化为手段 实现全行业在线监测     

龚威 《国土资源信息化》2010,(1):55-57,80

按照管理、办理、监测三条主线相分离的工作要求,建立行业在线监测机制,以信息化为手段,以基础数据和监测指标为量纲,实时在线监测规划和国土资源行业的行业动态和行政行为。  相似文献