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31.
Usama Massoud Fernando Santos Gad El Qady Magdy Atya Mamdouh Soliman 《Geophysical Prospecting》2010,58(2):267-277
32.
Mohamed Abdallah Gad DARWISH 《《地质学报》英文版》2011,85(4):881-898
A suite of elements(Ag,Au,Ba,Bi,Cd,Co,Cr,Cu,Ga,Hf,Hg,Mn,Mo,Ni,Pb,Rb,Sb,Se, Sr,Te and Zn),total organic carbon(TOC)and pH were analyzed in stream sediment and tailing samples from Um Shashoba area,in order to evaluate Au placer and the sediments being impacted by old mining activities.Analytical results were examined using statistical,graphical and mapping methods.In spite of the results revealing that Au and most of the elements in sediments were in general significantly lower than those in tailing,Au wa... 相似文献
33.
Eight years (1980–1987) of Wake Island rawinsonde data are used to derive atmospheric boundary layer (ABL) depth, integrated boundary-layer moisture, and a measure of boundary-layer ageostrophy. The variability in these processes controls the accumulation of moisture and heat in the tradewind regions and their transport to regions of intense convection. Preliminary analyses using different methods reveal quasi-periodic signals in these data in the 30–60 days range. Cross correlation calculations in this intraseasonal range show that these ABL variables are coherent with each other and with the low-level flow. The integrated ABL variables and the ABL height exhibit local in-phase relationships. At higher frequencies, the analyses show intense diurnal variation of boundary-layer height but only a weak diurnal signal in integrated ABL properties. At the lower frequency range, the analyses show a significant reduction in the amplitude of the seasonal and intraseasonal variation in ageostrophy during the strong El-Niño event of 1982/1983. The results clearly establish a relationship between integrated water vapour and divergent ABL processes (Ekman pumping/suction) in which shallower (deeper) ABLs are associated with mass and moisture divergence (convergence) and higher (lower) sea-level pressure. A possible interpretation in terms of a remote dynamic response of the trade inversion and ABL processes to equatorial deep convection is suggested. 相似文献
34.
Under mounting pressure from women, Canada introduced employment policies to address the gender wage gap and women's access
to a wider range of jobs. The policies were generally introduced between the late 1970s and early 1990s. Over time these policies
have shifted from focusing on equality to emphasising equity. Two pivotal policies are pay equity and employment equity. In
the end, the impact of these policies is difficult to assess. Keeping the European situation in mind we argue that they be
considered as a component of broader changes rather than as specific causes of improving the situation of women in the Canadian
labour market.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
35.
We calculate the energy density and energy distribution of Kantowski-Sachs space-time, using Einstein, Bergmann-Thomson and
Landau-Lifshitz energy-momentum complexes, in the theory of teleparallel gravity. A comparison of the results shows that the
Einstein and Bergmann-Thomson definitions furnish a consistent result for the energy density and energy distribution, but
the definition of Landau-Lifshitz does not concur with them. We show that the space-time under consideration gives a counterexample
that the energy distribution is the same either in general relativity or teleparallel gravity. 相似文献
36.
Mohamed O.Soliman Waleed B.Suleiman Mohamed M.Roushdy Eman N.Elbatrawy Ahmed M.Gad 《海洋学报(英文版)》2022,41(3):86-93
Marine microorganisms were considered to be important sources of marine bioactive compounds. The major objective of the study was to isolate and characterize bacteria with antimicrobial activities from the various marine environment of Egypt. In this respect, thirty-five bacterial isolates were recovered from sediment samples collected from different spots along the Egyptian Red Sea coastline and Alexandria coastline during the summer season of 2017 and 2018. According to the morphological, phys... 相似文献
37.
Rock water interactions play an important role in the flow of groundwater. Groundwater samples were collected from deep production wells with depths ranging from 120 to 230 m. Complete chemical analysis of 40 groundwater samples was collected from the fractured limestone aquifer including major cations (Na+, K+, Ca2+, Mg2+) and major anions (Cl?, SO4 2?, HCO3 ?, CO3 2?). A geochemical modeling (NETPATH Software) was applied for environmental simulate net geochemical mass-balance reactions between initial and final waters along a hydrologic flow path. This program simulates selected evolutionary waters for every possible combination of the plausible phases that account for the composition of a selected set of chemical constraints in the system. The groundwater of the Eocene aquifer mainly belongs to fairly fresh water with salinity contents ranging from 228 to 3595 ppm. The measured groundwater levels range between 8 and 25 m near the river Nile to the limestone plateau (eastwards). Consequently, groundwater flows from east to westward toward the river Nile. Groundwater aquifer in the study area is mainly composed of fractured limestone; the saturated states of the PCO2, calcite, aragonite, dolomite, siderite, gypsum, anhydrite, hematite, and goethite in addition to H2 gas were estimated. The undersaturated state of carbon dioxide reflects closed conditions and very low probability of recent recharge, and it reveals also the high tendency of water to precipitates carbonate species. Undersaturation by carbonate minerals is only restricted to some pockets distributed on the different places of the aquifer in the study area. The majority of groundwater samples of Eocene aquifer in the study area indicated that groundwater is not suitable for irrigation with treatment and requires good drainage. 相似文献