Soil Characterization Using Joint Interpretation of Remote Sensing,Resistivity and Induced Polarization Data along the Coast of the Nile Delta     

Attwa  Mohamed  El Mahmoudi  Ahmed  Elshennawey  Ahmed  Günther  Thomas  Altahrany  Ayman  Mohamed  Lamees 《Natural Resources Research》2021,30(5):3407-3428

Natural Resources Research - Soil characterization in coastal areas is essential for strategic coastal engineering implementation and for understanding the paleo-environmental conditions. However,...  相似文献   

Removal of Tartrazine Dye onto Mixed‐Waste Activated Carbon: Kinetic and Thermodynamic Studies          下载免费PDF全文

Mohamed Abdelaty Habila  Zeid Abdullah ALOthman  Rahmat Ali  Ayman Abdel Ghafar  Mohamed Slah El‐Din Hassouna 《洁净——土壤、空气、水》2014,42(12):1824-1831

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Rupture of an evaporating liquid bridge between two grains     

Boleslaw Mielniczuk  Moulay Said El Youssoufi  Laurent Sabatier  Tomasz Hueckel 《Acta Geophysica》2014,62(5):1087-1108

The study examines rupture of evaporating liquid bridges between two glass spheres. Evolution of the bridge profile has been recorded with the use of high-speed camera. Geometrical characteristics of the bridge were then used to calculate evolution of the variables during the process: Laplace pressure, capillary force, and surface tension force. For the purpose of reference, the bridge evolution is followed also during kinematic extension. During both processes the diameter of the neck decreases, with an acceleration of about 1–2 ms before the rupture. Two distinct rupture modes are observed, depending on the bridge aspect ratio. After the rupture, the mass of liquid splits, forming two separate oscillating drops attached to the spheres, and a suspended satellite droplet. Just before the rupture, an increasing repulsive Laplace pressure, and decreasing negative surface tension force develop. Capillary force follows the trend of the surface tension force, with an accelerating decline. Duration of the whole process and liquid mass stabilization is from 10 to 60 ms.  相似文献   

Fungal Decontamination of Fleshy Fruit Water Washes by Double Atmospheric Pressure Cold Plasma          下载免费PDF全文

Salama A. Ouf  Abdel‐Aleam H. Mohamed  Wael S. El‐Sayed 《洁净——土壤、空气、水》2016,44(2):134-142

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Combination of Syringe–Solid Phase Extraction with Inductively Coupled Plasma Mass Spectrometry for Efficient Heavy Metals Detection          下载免费PDF全文

Mohamed A. Habila  Zeid A. ALOthman  Ahmed Mohamed El‐Toni  Mustafa Soylak 《洁净——土壤、空气、水》2016,44(6):720-727

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Oxidative stress, genotoxicity and histopathology biomarker responses in mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) liver from Bizerte Lagoon (Tunisia)     

Ben Ameur W  de Lapuente J  El Megdiche Y  Barhoumi B  Trabelsi S  Camps L  Serret J  Ramos-López D  Gonzalez-Linares J  Driss MR  Borràs M 《Marine pollution bulletin》2012,64(2):241-251

The aim of the study was to evaluate the impact of environmental contaminants on oxidative stress, genotoxic and histopathologic biomarkers in liver of mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) collected from a polluted coastal lagoon (Bizerte Lagoon) in comparison to a reference site (the Mediterranean Sea). Antioxidant enzyme activities were lower in fish from the polluted site compared with fish from the reference site, suggesting deficiency of the antioxidant system to compensate for oxidative stress. DNA damage was higher in both fish species from the contaminated site indicating genotoxic effects. The liver histopathological analysis revealed alterations in fish from Bizerte Lagoon. Hepatocytes from both fish species featured extensive lipid-type vacuolation and membrane disruption. Results suggest that the selected biomarkers in both fish species are useful for the assessment of pollution impacts in coastal environments influenced by multiple pollution sources.  相似文献   

Spatial distribution and temporal trends of persistent organochlorine pollutants in sediments from Lake Maryut, Alexandria, Egypt   总被引：2，自引：0，他引：2  

Barakat AO  Mostafa A  Wade TL  Sweet ST  El Sayed NB 《Marine pollution bulletin》2012,64(2):395-404

Organochlorine compounds (OCs) in surface and core sediments collected from Lake Maryut, Egypt, were examined to elucidate their distribution, ecological risk and historical trend. To our knowledge, this is the first study on residue levels of OCs in sediments from Lake Maryut. Concentrations of PCBs and DDTs were higher than other OCs, ranging from 3.06 to 388 and from 0.07 to 106 ng/g dry wt., respectively. The highest concentrations of OCs were found at stations near the discharge point of sewage and close to industrial areas. The distribution of DDT and its metabolites suggest no recent inputs into the lake environment. Contamination levels of sedimentary PCBs and DDTs, can be categorized moderate to high compared to other urbanized regions worldwide. Temporal trends in OCs levels were influenced by input pathways at two sites. Evaluation of ecotoxicological risks suggests that adverse biological effects are expected mainly in the main basin area.  相似文献   

Numerical analyses of fault–foundation interaction     

I. Anastasopoulos  A. Callerio  M. F. Bransby  M. C. R. Davies  A. El Nahas  E. Faccioli  G. Gazetas  A. Masella  R. Paolucci  A. Pecker  E. Rossignol 《Bulletin of Earthquake Engineering》2008,6(4):645-675

Field evidence from recent earthquakes has shown that structures can be designed to survive major surface dislocations. This paper: (i) Describes three different finite element (FE) methods of analysis, that were developed to simulate dip slip fault rupture propagation through soil and its interaction with foundation–structure systems; (ii) Validates the developed FE methodologies against centrifuge model tests that were conducted at the University of Dundee, Scotland; and (iii) Utilises one of these analysis methods to conduct a short parametric study on the interaction of idealised 2- and 5-story residential structures lying on slab foundations subjected to normal fault rupture. The comparison between numerical and centrifuge model test results shows that reliable predictions can be achieved with reasonably sophisticated constitutive soil models that take account of soil softening after failure. A prerequisite is an adequately refined FE mesh, combined with interface elements with tension cut-off between the soil and the structure. The results of the parametric study reveal that the increase of the surcharge load q of the structure leads to larger fault rupture diversion and “smoothing” of the settlement profile, allowing reduction of its stressing. Soil compliance is shown to be beneficial to the stressing of a structure. For a given soil depth H and imposed dislocation h, the rotation Δθ of the structure is shown to be a function of: (a) its location relative to the fault rupture; (b) the surcharge load q; and (c) soil compliance.  相似文献   

Cs baseline levels in the Mediterranean and Black Sea: A cross-basin survey of the CIESM Mediterranean Mussel Watch programme     

Herv Thbault  Alessia M. Rodriguez y Baena  Bruno Andral  Delko Barisic  Jos Benedicto Albaladejo  Alexandru S. Bologa  Redouane Boudjenoun  Roberta Delfanti  Victor N. Egorov  Tahar El Khoukhi  Heleni Florou  Goran Kniewald  Abdelkader Noureddine  Vasile Patrascu  Mai Khanh Pham  Alfonso Scarpato  Nikolay A. Stokozov  Sayhan Topcuoglu  Michel Warnau 《Marine pollution bulletin》2008,57(6-12):801

The common mussel Mytilus galloprovincialis was selected as unique biomonitor species to implement a regional monitoring programme, the CIESM Mediterranean Mussel Watch (MMW), in the Mediterranean and Black Seas. As of today, and upon standardization of the methodological approach, the MMW Network has been able to quantify ¹³⁷Cs levels in mussels from 60 coastal stations and to produce the first distribution map of this artificial radionuclide at the scale of the entire Mediterranean and Black Seas. While measured ¹³⁷Cs levels were found to be very low (usually <1 Bq kg⁻¹ wet wt) ¹³⁷Cs activity concentrations in the Black Sea and North Aegean Sea were up to two orders of magnitude higher than those in the western Mediterranean Basin. Such effects, far from representing a threat to human populations or the environment, reflect a persistent signature of the Chernobyl fallout in this area.  相似文献   

Operational performance of current synthetic aperture radar sensors in mapping soil surface characteristics in agricultural environments: application to hydrological and erosion modelling   总被引：1，自引：0，他引：1  

Nicolas Baghdadi  Olivier Cerdan  Mehrez Zribi  Véronique Auzet  Frédéric Darboux  Mahmoud El Hajj  Rania Bou Kheir 《水文研究》2008,22(1):9-20

Synthetic aperture radar (SAR) sensors are often used to characterize the surface of bare soils in agricultural environments. They enable the soil moisture and roughness to be estimated with constraints linked to the configurations of the sensors (polarization, incidence angle and radar wavelength). These key soil characteristics are necessary for different applications, such as hydrology and risk prediction. This article reviews the potential of currently operational SAR sensors and those planned for the near future to characterize soil surface as a function of users' needs. It details what it is possible to achieve in terms of mapping soil moisture and roughness by specifying optimal radar configurations and the precision associated with the estimation of soil surface characteristics. The summary carried out for the present article shows that mapping soil moisture is optimal with SAR sensors at low incidence angles (<35 ). This configuration, which enables an estimated moisture accuracy greater than 6% is possible several times a month taking into account all the current and future sensors. Concerning soil roughness, it is best mapped using three classes (smooth, moderately rough, and rough). Such mapping requires high‐incidence data, which is possible with certain current sensors (RADARSAT‐1 and ASAR both in band C). When L‐band sensors (ALOS) become available, this mapping accuracy should improve because the sensitivity of the radar signal to Soil Surface Characteristics (SSC) increases with wavelength. Finally, the polarimetric mode of certain imminent sensors (ALOS, RADARSAT‐2, TerraSAR‐X, etc.), and the possibility of acquiring data at very high spatial resolution (metre scale), offer great potential in terms of improving the quality of SSC mapping. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献