Mohamed A. Khalil

University of Nebraska–Lincoln

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Fernando A. Monteiro Santos

University of Lisbon

Mohammad Farzamian

Instituto Nacional de Investigação Agrária e Veterinária

Nico M. van Straalen

Vrije Universiteit Amsterdam

Hala M. Abdel-Lateif

Tanta University

M. Atya

National Research Institute of Astronomy and Geophysics

M. A. Speece

Montana Technological University

Bayoumi M. Bayoumi

Tanta University

Hamza Farooq Gabriel

National University of Sciences and Technology

Hiroyuki Kamei

Meijo University

A.I.M. Al-Assiuty

Tanta University

Cooperative Institutions

National Research Institute of Astronomy and Geophysics

Montana Technological University

Vrije Universiteit Amsterdam

Tanta University

University of Chile

University of Lisbon

Tokyo Institute of Technology

Charles Sturt University

CSIRO Land and Water

Czech Academy of Sciences, Institute of Geophysics

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Geophysical investigation of dewatering in Lolo Creek, Southwest Missoula, Montana, USA

Journal of Applied Geophysics (2018)

Akpofure Orubu Mohamed A. Khalil Bradley Rutherford Glenn D. Shaw Ali Gebril

Bedrock

Electrical Resistivity Tomography

Seismic refraction

Lithology

Ground-Penetrating Radar

10.1016/j.jappgeo.2018.06.014

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Citations (3)

Integrated geophysical methods to characterize urban subsidence in Butte, Montana, U.S.A.

Journal of Applied Geophysics (2019)

Kristen D. Prudhomme Mohamed A. Khalil Glenn D. Shaw M. A. Speece Katherine R. Zodrow

Electrical Resistivity Tomography

Butte

Overburden

Lithology

Ground-Penetrating Radar

Bedrock

Petrophysics

10.1016/j.jappgeo.2019.03.004

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Citations (13)

Characterization of seepage in an earthfill dam by the integration of geophysical surveys and geotechnical data

Journal of Applied Geophysics (2023)

Mohamed A. Khalil David Barrick R.M. Joeckel

Piezometer

Electrical Resistivity Tomography

Embankment dam

10.1016/j.jappgeo.2023.105273

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Citations (2)

Application of EM38 and ERT methods in estimation of saturated hydraulic conductivity in unsaturated soil

Journal of Applied Geophysics (2014)

Mohammad Farzamian Fernando A. Monteiro Santos Mohamed A. Khalil

Electrical Resistivity Tomography

Saturation (graph theory)

Degree of saturation

10.1016/j.jappgeo.2014.11.016

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Citations (59)

Salinity modeling by remote sensing in central and southern Iraq

AGUFM (2012)

Wei Wu Ahmad S. Mhaimeed Alexander E. Platonov Waleed M. Al‐Shafie Mohamed A. Khalil

Source

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Citations (2)

TEMPERATURE, PHYSIOLOGICAL TIME, AND ZINC TOXICITY IN THE ISOPOD PORCELLIO SCABER

Environmental Toxicology and Chemistry (1998)

Marianne Donker Hala M. Abdel-Lateif Mohamed A. Khalil Bayoumi M. Bayoumi Nico M. van Straalen

Temperature is an important controlling factor in the metabolism of ectotherms, and it may interact with the toxicity of heavy metals in a variety of ways. In this work, a study on the effect of different zinc concentrations (0.3, 13, 26, and 40 μmol/g dry litter) on growth (body weight) of the isopod Porcellio scaber was conducted using four temperature levels (12, 16, 20, and 24°C). The results demonstrated a significant effect for both zinc and temperature on the growth rate; the interaction between zinc and temperature was also significant. The Arrhenius function was used to describe the temperature–growth rate relationship, from which estimates for the activation energy were derived. A tendency for activation energy to decrease with increasing zinc concentration was observed. Isopods exposed to 13 μmol Zn/g had the highest activation energy and the highest growth rate. To analyze the effect of temperature on the internal body concentration of zinc, the exposure time was transformed into physiological time, calibrated at 15°C, for all experimental groups using the activation energies estimated earlier. The rate of zinc accumulation was derived from the relationship between internal body concentration and physiological exposure time. Differences between isopods cultured at different temperatures could be explained well by the effect of physiological exposure time. The interaction between temperature and zinc toxicity seems to be due not to increased accumulation of zinc at higher temperatures as such but to a physiological interaction with the energy metabolism.

Isopoda

Zinc toxicity

10.1897/1551-5028(1998)017<1558:tptazt>2.3.co;2

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Citations (52)

Utilizing 2D Electrical Resistivity Tomography and Very Low Frequency Electromagnetics to Investigate the Hydrogeology of Natural Cold Springs Near Virginia City, Southwest Montana

Pure and Applied Geophysics (2018)

Mohamed A. Khalil Andrew L. Bobst J.G. Mosolf

Electrical Resistivity Tomography

10.1007/s00024-018-1865-2

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Citations (15)

2-D Fourier transform analysis of the gravitational field of Northern Sinai Peninsula

Journal of Applied Geophysics (2015)

Mohamed A. Khalil Fernando A. Monteiro Santos Mohammad Farzamian Abeer El-Kenawy

Peninsula

10.1016/j.jappgeo.2015.01.022

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Citations (7)

Aeromagnetic and spectral expressions of rare earth element deposits in Gallinas Mountains area, Central New Mexico, USA

Interpretation (2018)

Mo Li Xiaobing Zhou Christopher H. Gammons Mohamed A. Khalil M. A. Speece

The Gallinas Mountains, located at the junction of Lincoln and Torrance Counties, New Mexico, USA, are a series of alkaline volcanic rocks intruded into Permian sedimentary rocks. The Gallinas Mountains area hosts fluorite and copper as veins containing bastnäsite, whereas deposits of iron skarns and iron replacement are in the area as well. These deposits produce iron. In this study, the multispectral band-ratio method is used for surface mineral recognition, whereas 2D subsurface structure inversion modeling was applied to explore the depth extent of the magnetic ore distribution from aeromagnetic data. Bastnäsite has higher magnetic susceptibility (0.009 SI) than the host rocks and surrounding sedimentary rock. The bastnäsite and iron oxides (magnetite + hematite) can contribute to a positive aeromagnetic anomaly. Results indicate that (1) the positive magnetic anomaly observed at Gallinas Mountains area can be accounted for by a mixture of bastnäsite and iron oxides at a depth of approximately 400 m and a thickness of approximately 13–15 m. The surface of this area is dominated by the hydrothermal alteration associated with iron oxides over the trachyte intrusions as detected by Landsat 8 band-ratio imaging.

Lile

10.1190/int-2017-0199.1

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Citations (1)

Using real surface conductivity component to estimate hydraulic conductivity

Mohamed A. Khalil Fernando A. Monteiro Santos

Estimation of hydraulic conductivity from surface resistivity measurements is one of the most difficult and challenging hydrogeophysical targets. The promising side of this relation is the analogy between electric current flow and water flow, whereas the grand ambiguity is the non dimensionality between both two quantities. Imaginary surface conductivity component is used recently to deduce the hydraulic conductivity via complex resistivity measurements (Börner et al 1992, 1996, and Slater and Lesmes, 2002). Since there are similar properties between imaginary (out‐of phase) and real (in‐phase) surface conductivity components, the latter is used in this paper to estimate an electrical equivalent parameter to the hydraulic conductivity. Two mathematical parameters were determined to express the hydraulic conductivity in two hydrogeological systems. Highly resistive sand formation saturated with fresh water is simulated by a parallel resistor model, whereas highly conductive clayey formation saturated with salt water is simulated by a parallel conductor model. The reliability of the proposed method is tested through applying on different resitivity data sets resembling the sand and clay systems. Application on the resistivity data either measured inside the well (Resistivity well logs) or on the ground surface (Vertical Electrical Sounding) resulted in a numerical value in the same magnitude of the measured hydraulic conductivity by pumping test.

Component (thermodynamics)

Surface conductivity

10.1190/1.3513673

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Citations (0)