M. Humayun
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View article: Magnetically assisted separation of weakly magnetic metal ions in porous media. Part 2: numerical simulations
Magnetically assisted separation of weakly magnetic metal ions in porous media. Part 2: numerical simulations Open
We present a numerical investigation of the magnetophoresis of metal ions in porous media under static, nonuniform magnetic fields.
View article: Magnetically Assisted Separation of Weakly Magnetic Metal Ions in Porous Media.Part 1: Experiments
Magnetically Assisted Separation of Weakly Magnetic Metal Ions in Porous Media.Part 1: Experiments Open
We report experiments on the magnetophoresis of paramagnetic (MnCl2) and diamagnetic (ZnCl2) metal ions in porous media under the influence of a non-uniform magnetic field generated by a permanent magnet. Experiments were carried out in a …
View article: Recent Advances in Rare Earth Element Recovery: Liquid–Liquid Extraction and Magnetophoretic Separation
Recent Advances in Rare Earth Element Recovery: Liquid–Liquid Extraction and Magnetophoretic Separation Open
The unique physicochemical properties of rare earth elements (REEs) make them imperative for the production and improvement of advanced technology, renewable energy, and national defense applications. As these fields rapidly develop, there…
View article: Origin of the metal in chondritic and achondritic lithologies of the Sierra Gorda 013 СBa‐like chondrite
Origin of the metal in chondritic and achondritic lithologies of the Sierra Gorda 013 СBa‐like chondrite Open
Sierra Gorda 013 (SG 013) is an unusual CBa‐like chondrite containing two texturally different, isotopically identical lithologies—chondritic (L1) and achondritic (L2), which should have a common origin. The metal globules of the L1 metal …
View article: The Role of Sustainable Leadership in Delivering Frugal Innovation in Pakistan: A Mediated Moderation Model.
The Role of Sustainable Leadership in Delivering Frugal Innovation in Pakistan: A Mediated Moderation Model. Open
Innovation and sustainability are important priorities in current business landscapes. This study carries extreme importance in revealing how sustainable leadership (SL) delivers frugal innovation (FI) in organizations. Moreover, insights …
View article: Magnetophoresis of Weakly Magnetic Nanoparticle Suspension Around a Wire
Magnetophoresis of Weakly Magnetic Nanoparticle Suspension Around a Wire Open
We present a combined experimental and numerical study into the magnetophoresis behavior of weakly magnetic nanoparticle suspensions in the vicinity of a wire under a non-uniform magnetic field and negligible inertia. The experiments were …
View article: Magnetophoresis of paramagnetic nanoparticles in suspensions under magnetic field gradients
Magnetophoresis of paramagnetic nanoparticles in suspensions under magnetic field gradients Open
We systematically investigate the magnetophoresis of weakly paramagnetic manganese oxide nanoparticles under nonuniform magnetic fields using a combination of experiments and multiphysics numerical simulations. Experiments were conducted i…
View article: Altering the Symmetry of Fe–N–C by Axial Cl‐Mediation for High‐Performance Zinc–Air Batteries
Altering the Symmetry of Fe–N–C by Axial Cl‐Mediation for High‐Performance Zinc–Air Batteries Open
Fe–N–C catalyst is acknowledged as a promising alternative for the state‐of‐the‐art Pt/C in oxygen reduction reaction (ORR) toward cutting‐edge electrochemical energy conversion/storage applications. Herein, a “Cl‐mediation” strategy is pr…
View article: Dynamics of Transition Metal Ion Transport in High-Gradient Magnetic Fields
Dynamics of Transition Metal Ion Transport in High-Gradient Magnetic Fields Open
Magnetic separation has emerged as an eco-friendly and sustainable technique with applications in water purification, chemical separation, biochemical, medical, and mining. In this study, we present, a combined experimental and theoretical…
View article: Representing The World Around Us: Applications of Group Representation Theory to Molecular Orbital (MO) Theory
Representing The World Around Us: Applications of Group Representation Theory to Molecular Orbital (MO) Theory Open
Molecular orbital (MO) theory is a theory at the forefront of modern chemistry, allowing for accurate descriptions of reactivity of molecules by using quantum mechanics to predict the location of electrons within a molecule, and their corr…
View article: Magnetophoresis of paramagnetic metal ions in porous media
Magnetophoresis of paramagnetic metal ions in porous media Open
We report a numerical investigation of the magnetophoresis of solutions containing paramagnetic metal ions.
View article: Experimental constraints on the volatility of germanium, zinc, and lithium in Martian basalts and the role of degassing in alteration of surface minerals
Experimental constraints on the volatility of germanium, zinc, and lithium in Martian basalts and the role of degassing in alteration of surface minerals Open
The surface of Mars is enriched in Cl and S which is linked to volcanic activity and degassing. Similarly, elevated Ge and Zn levels in Gale crater sedimentary bedrock indicate a magmatic source for these elements. To constrain the relativ…
View article: Cadmium as a tracer of volcanism at the Cretaceous-Paleogene boundary
Cadmium as a tracer of volcanism at the Cretaceous-Paleogene boundary Open
Major volcanic eruptions like the Deccan have long been invoked as causes of global mass extinctions. Deccan volcanism erupted ~ 600,000 km3 over the span of ~ 700 ka contemporaneously with the end-Cretaceous mass extinction. It has been d…
View article: Depletion of Moderately Volatile Elements by Open-system Loss in the Early Solar Nebula
Depletion of Moderately Volatile Elements by Open-system Loss in the Early Solar Nebula Open
Rocky bodies of the inner solar system display a systematic depletion of “moderately volatile elements” (MVEs) that correlates with the expected condensation temperature of their likely host materials under protoplanetary nebula conditions…
View article: Depletion of Moderately Volatile Elements by Open-System loss in the Early Solar Nebula
Depletion of Moderately Volatile Elements by Open-System loss in the Early Solar Nebula Open
Rocky bodies of the inner solar system display a systematic depletion of the "Moderately Volatile Elements" (MVEs) that correlates with the expected condensation temperature of their likely host materials under protoplanetary nebula condit…
View article: Evidence of high effusion Deccan volcanism proceeding the KPg boundary at Elles, Tunisia
Evidence of high effusion Deccan volcanism proceeding the KPg boundary at Elles, Tunisia Open
<p>Massive volcanic eruptions of the Deccan coincided with the end-Cretaceous mass extinction. Precisely dating when the most intense eruptions occurred is challenging because the resolution of geochronological techniques does not ye…
View article: Sierra Gorda 013: Unusual CBa‐like chondrite
Sierra Gorda 013: Unusual CBa‐like chondrite Open
The new metal‐enriched anomalous chondrite Sierra Gorda 013 (SG 013) contains two different lithologies. Lithology 1 (L1) is represented by anomalous CBa‐like chondrite material containing ~80 vol% of Fe,Ni‐metal particles and globules up …
View article: Chemical study of group IIIF iron meteorites and the potentially related pallasites Zinder and Northwest Africa 1911
Chemical study of group IIIF iron meteorites and the potentially related pallasites Zinder and Northwest Africa 1911 Open
Group IIIF was established as a magmatic iron-meteorite group based on similar Ga and Ge abundances, unusually high Ga/Ge ratios, and the IIIAB-like interelement trends in its members; recent Mo and Ru isotopic data indicate that three of …
View article: Discovery of davemaoite, CaSiO <sub>3</sub> -perovskite, as a mineral from the lower mantle
Discovery of davemaoite, CaSiO <sub>3</sub> -perovskite, as a mineral from the lower mantle Open
Lower mantle “garbage can” Calcium silicate perovskite has finally been identified in a natural sample and now has the mineral name davemaoite. Tschauner et al . discovered the type mineral trapped at high pressure and temperature as a dia…
View article: A large meteoritic event over Antarctica ca. 430 ka ago inferred from chondritic spherules from the S&#248;r Rondane Mountains.
A large meteoritic event over Antarctica ca. 430 ka ago inferred from chondritic spherules from the Sør Rondane Mountains. Open
Introduction: Impactors several tens up to 200 m in size are likely to suffer complete disruption and to produce large airbursts, similarly to the Tunguska event over Russia in 1908 [e.g., 1]. Observations and numerical modeling of medium …
View article: Pyrite Oxidation Controlled Siderophile Element Accumulation on the K-Pg Boundary at El Kef, Tunisia
Pyrite Oxidation Controlled Siderophile Element Accumulation on the K-Pg Boundary at El Kef, Tunisia Open
<p>In a transformative contribution, Alvarez et al. (1980) discovered the iridium anomaly at several K-Pg boundary locations that they attributed to an extraterrestrial impact that triggered the end-Cretaceous extinction. The absence…
View article: Evidence for contemporaneous Deccan volcanic aerosol deposition preceding the K-Pg boundary at El Kef, Tunisia
Evidence for contemporaneous Deccan volcanic aerosol deposition preceding the K-Pg boundary at El Kef, Tunisia Open
<p>The cause of the Cretaceous-Paleogene extinction remains debated between an asteroid impact and volcanism. Precise geochronology showed that the extinction coincided with a voluminous phase (Poladpur eruption) of Deccan volcanism …
View article: <sup>40</sup>Ar/<sup>39</sup>Ar ages of Northwest Africa 7034 and Northwest Africa 7533
<sup>40</sup>Ar/<sup>39</sup>Ar ages of Northwest Africa 7034 and Northwest Africa 7533 Open
The Martian breccias NWA 7034, NWA 7533, and paired meteorites record events ranging in age from 4.47 Ga to 1 wt% K and thought to be rich in feldspar and one containing <~1 wt% K, cluster near 1.4 Ga. The 40 Ar/ 39 Ar ages of nine grains …
View article: Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland
Molecular Signatures of Glacial Dissolved Organic Matter From Svalbard and Greenland Open
Glaciers and ice sheets cover over 10 % of Earth's land surface area and store a globally significant amount of dissolved organic matter (DOM), which is highly bioavailable when exported to proglacial environments. Recent rapid glacier mas…
View article: Unique achondrite Northwest Africa 11042: Exploring the melting and breakup of the L Chondrite parent body
Unique achondrite Northwest Africa 11042: Exploring the melting and breakup of the L Chondrite parent body Open
Northwest Africa (NWA) 11042 is a heavily shocked achondrite with medium-grained cumulate textures. Its olivine and pyroxene compositions, oxygen isotopic composition, and chromium isotopic composition are consistent with L chondrites. Sm-…
View article: Mantle–melt partitioning of the highly siderophile elements: New results and application to Mars
Mantle–melt partitioning of the highly siderophile elements: New results and application to Mars Open
Trace elements and extant and extinct isotopic attributes in Martian meteorites have been used to argue that Mars accreted quickly, differentiated into core and mantle, and established several mantle reservoirs, possibly within 10 Ma of T0…