7th Latin-American Conference on Space Geophysics, Atibaia, SP, Brazil, March 29–April 2, 2004     

Barclay Clemesha  Chairman&#x;Colage Editorial Committee  Cristina Mandrini  Paulo Batista  Inez Batista  Abraham Chian  Co-editors 《Journal of Atmospheric and Solar》2005,67(17-18)

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Host galaxies of the optically violently variable quasars PKS 0736+017, OJ 287 and LB 2136     

S. C. Wright  I. M. McHardy  & R. G. Abraham 《Monthly notices of the Royal Astronomical Society》1998,295(4):799-812

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The origin of the cosmic soft X-ray background: optical identification of an extremely deep ROSAT survey     

MHardy  Jones  Merrifield  Mason  Newsam  Abraham  Dalton  Carrera  Smith  Rowan-Robinson  Wegner  Ponman  Lehto  Branduardi-Raymont  Luppino  Efstathiou  Allan  & Quenby 《Monthly notices of the Royal Astronomical Society》1998,295(3):641-671

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Six years of dew observations in the Negev Desert, Israel   总被引：4，自引：0，他引：4  

Abraham Zangvil 《Journal of Arid Environments》1996,32(4):361-371

Dew measurements taken at the desert site of Sede Boker for nearly 6 years are analysed. The instrument used is a Hiltner-type dew balance. Several parameters describing various aspects of dew formation are discussed. The total monthly amount of dew and the distribution of the number of dew nights per month shows two maxima (in September and in December–January) and two minima (in April and November). The average dew deposit per dew night behaves differently: the most striking feature of this quantity is the appearance of distinct summer and winter regimes, with the winter having more dew per dew night. With respect to the total monthly dew hours, the year appears to be divided in half: first, the 6 months from August to January, with an average of 145 h per month, and second, the 6 months from February to June, with 80 h per month. The average duration of dew per dew night appears to follow very closely the length of the night: there is a clear maximum of dew duration in December (9·7 h) and a clear minimum in July (5·5 h). Finally, the rate of dew accumulation is found to have a distinct dry season regime and a winter, rainy season regime.  相似文献   

A miscibility gap in trioctahedral Mn-Mg-Fe chlorites: Evidence from the Lienne Valley manganese deposit,Ardennes, Belgium     

W. Schreyer  A. -M. Fransolet  K. Abraham 《Contributions to Mineralogy and Petrology》1986,94(3):333-342

Low-temperature veinlets crosscutting low-grade manganiferous ironstones of Ordovician age contain four texturally distinct types of chlorites with nearly constant Al/Si-ratios that form two separate populations regarding their Mn/Mg/Fe-ratios: One with low iron contents (<1.5 w.% FeO) and molar Mg/Mn-ratios just below unity (magnesian pennantites), the other with higher iron (7–11 w.% FeO) and Mg/Mn?4 (manganoan clinochlores). The two populations, which can be distinguished readily by their characteristic optical elongation and dispersion colors, are intimately intergrown and have formed partly during consecutive stages of a chlorite crystallization sequence, partly by simultaneous growth and possibly even as exsolution products of a pre-existing homogeneous chlorite phase of intermediate composition. These findings indicate a miscibility gap in the chlorite solid solutions beginning along the binary Mg-Mn series and extending into the ternary system. There may be a solvus relationship with the miscibility gap closing at higher temperatures (400° C?). One very intensely colored chlorite type of the pennantite population may contain Fe³⁺ or Mn³⁺ or both. Additional minerals in the veinlets are spessartine, kutnahorite, quartz, and an allanite-piemontite phase. Crystallization began near the centers of the present veins with Mn-rich minerals and continued towards their edges and into the extremely thin ends of the developing fractures with the deposition of the more Fe-rich chlorites that are in equilibrium with the ironstone.  相似文献   

Prediction of Groundwater Level in Ardebil Plain Using Support Vector Regression and M5 Tree Model          下载免费PDF全文

Mohammad Taghi Sattari  Rasoul Mirabbasi  Reza Shamsi Sushab  John Abraham 《Ground water》2018,56(4):636-646

The Ardebil plain, which is located in northwest Iran, has been faced with a recent and severe decline in groundwater level caused by a decrease of precipitation, successive long‐term droughts, and overexploitation of groundwater for irrigating the farmlands. Predictions of groundwater levels can help planners to deal with persistent water deficiencies. In this study, the support vector regression (SVR) and M5 decision tree models were used to predict the groundwater level in Ardebil plain. The monthly groundwater level data from 24 piezometers for a 17‐year period (1997 to 2013) were used for training and test of models. The model inputs included the groundwater levels of previous months, the volume of entering precipitation into every cell, and the discharge of wells. The model output was the groundwater level in the current month. In order to evaluate the performance of models, the correlation coefficient (R) and the root‐mean‐square error criteria were used. The results indicated that both SVR and M5 decision tree models performed well for the prediction of groundwater level in the Ardebil plain. However, the results obtained from the M5 decision tree model are more straightforward, more easily applied, and simpler to interpret than those from the SVR. The highest accuracy was obtained using the SVR model to predict the groundwater level from the Ghareh Hasanloo and Khalifeloo piezometers with R = 0.996 and R = 0.983, respectively.  相似文献   

Trapping Ionic Mercury Using Different Adsorbents     

Adedamola Titi Ojedokun  Abraham Olusegun Oluwole  Olugbenga Solomon Bello 《洁净——土壤、空气、水》2019,47(12)

Of recent, adsorption process has gained a lot of attention as a cheap and effective means of removing trace metals from wastewater prior to discharge into water bodies. Being flexible in design and operation, the process has enabled an optimal recovery of trace metals such that the treated effluents meet the desired standards for waste disposal. Mercury is a toxicant released into the environment from natural and anthropogenic sources. It is notorious for having an unusual tendency to bio‐accumulate and persist in the food chain. Presence of mercury in food, especially those of aquatic sources has drastic implications on human health. Therefore, efforts have been made to develop and optimize low‐cost activated carbon (AC) as adsorbents for scavenging mercury from aqueous effluents. Herein, how mercury accumulates across the food chain, its health implications, and the recent advancement in the use of low‐cost ACs as adsorbent for trapping mercury from wastewater are highlighted. Relationship between the mercury removal efficiency and the surface morphology of the adsorbents as well as the influence of prevailing experimental condition on the sorption process were addressed. Challenges and future prospects of the use of low‐cost adsorbents in addressing mercury pollution in the environment are discussed.  相似文献   

Effects of Wormhole Configurations on Performance of Cyclic Solvent Injection in Heavy Oil Systems     

David  Nathan Abraham  Torabi  Farshid 《Natural Resources Research》2019,28(3):1021-1035

Natural Resources Research - In this study, the effect of three different wormhole configurations: single-linear, single-branched, and double-branched wormholes on the performance of cyclic solvent...  相似文献   

Effect of Emission From the Moon on Remote Sensing of Sea Surface Salinity: An Example With the Aquarius Radiometer     

Dinnat  E.P. Abraham  S. Le Vine  D.M. de Matthaeis  P. Jacob  D. 《Geoscience and Remote Sensing Letters, IEEE》2009,6(2):239-243

This letter describes the effect of thermal emission from the Moon on remote sensing of sea surface salinity from space. In most cases, radiation from the Moon is negligible; however, at several times during the lunar cycle, it is possible for radiation to be reflected from the Earth's surface into the main beam of the radiometer antennas. The signal in such cases can be important because of the high radiometric accuracy required to monitor salinity. Examples are presented using the Aquarius orbit and antennas for both smooth and rough ocean surfaces.  相似文献   

Dynamics of triple black hole systems in hierarchically merging massive galaxies     

Loren Hoffman  Abraham Loeb 《Monthly notices of the Royal Astronomical Society》2007,377(3):957-976

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