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Institution

Lehigh University

EducationBethlehem, Pennsylvania, United States
About: Lehigh University is a education organization based out in Bethlehem, Pennsylvania, United States. It is known for research contribution in the topics: Catalysis & Fracture mechanics. The organization has 12684 authors who have published 26550 publications receiving 770061 citations.


Papers
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Journal ArticleDOI
13 Jun 2012-ACS Nano
TL;DR: The results suggest that the metal nanoparticles not only play a role in capturing photogenerated electrons, but are strongly involved in the photocatalytic reaction mechanism, and Interestingly, the as-prepared Pd and Au-Pd decorated TiO(2) materials exhibit excellent long-term photoactivity.
Abstract: Noble metal nanoparticles (Au, Pd, Au–Pd alloys) with a narrow size distribution supported on nanocrystalline TiO2 (M/TiO2) have been synthesized via a sol-immobilization route. The effect of metal identity and size on the photocatalytic performance of M/TiO2 has been systematically investigated using phenol as a probe molecule. A different phenol degradation pathway was observed when using M/TiO2 catalysts as compared to pristine TiO2. We propose a mechanism to illustrate how the noble metal nanoparticles enhance the efficiency of phenol decomposition based on photoreduction of p-benzoquinone under anaerobic conditions. Our results suggest that the metal nanoparticles not only play a role in capturing photogenerated electrons, but are strongly involved in the photocatalytic reaction mechanism. The analysis of the reaction intermediates allows us to conclude that on M/TiO2 undesired redox reactions that consume photogenerated radicals are effectively suppressed. The analysis of the final products shows th...

249 citations

Journal ArticleDOI
TL;DR: In this article, the authors identify the main findings of studies on acquisitions in and out of emerging economies (EE), with a focus on what new insights can be gained and what new research directions are revealed.

248 citations

Journal ArticleDOI
TL;DR: In this paper, the phase separation of the second-stage monomer from the crosslinked seed network during swelling and polymerization was investigated by examining the changes in particle morphology using optical microscopy, which revealed that phase separation was induced by the relaxation of the polymer chains before polymerization and was enhanced by increased conversion.
Abstract: Polystyrene/polystyrene latex interpenetrating polymer networks (IPNs) were prepared by seeded emulsion polymerzation of styrene–divinylbenzene mixtures in crosslinked monodisperse polystyrene seed latexes. The resulting latexes comprised uniform nonspherical particles, which were formed by separation of the second-stage monomer from the crosslinked seed network during swelling and polymerization. The kinetics of phase separation were investigated by examining the changes in particle morphology using optical microscopy, which revealed that the phase separation was induced by the relaxation of the polymer chains before polymerization began and was enhanced by increased conversion. The thermodynamics of phase separation were investigated by analysis of the free-energy changes during swelling and polymerization, and the phase separation was described by a nucleation-and-growth mechanism. The results of this study have been applied to the design and synthesis of a series of uniform nonspherical particles of different morphology.

248 citations

Journal ArticleDOI
TL;DR: A stochastic model of microtubule (MT) assembly dynamics that estimates tubulin–tubulin bond energies, mechanical energy stored in the lattice dimers, and the size of the tubulin-GTP cap at MT tips is developed and generates MT dynamic instability with rates and transition frequencies similar to those measured experimentally.
Abstract: We developed a stochastic model of microtubule (MT) assembly dynamics that estimates tubulin–tubulin bond energies, mechanical energy stored in the lattice dimers, and the size of the tubulin-GTP cap at MT tips. First, a simple assembly/disassembly state model was used to screen possible combinations of lateral bond energy (ΔGLat) and longitudinal bond energy (ΔGLong) plus the free energy of immobilizing a dimer in the MT lattice (ΔGS) for rates of MT growth and shortening measured experimentally. This analysis predicts ΔGLat in the range of −3.2 to −5.7 kBT and ΔGLong plus ΔGS in the range of −6.8 to −9.4 kBT. Based on these estimates, the energy of conformational stress for a single tubulin-GDP dimer in the lattice is 2.1–2.5 kBT. Second, we studied how tubulin-GTP cap size fluctuates with different hydrolysis rules and show that a mechanism of directly coupling subunit addition to hydrolysis fails to support MT growth, whereas a finite hydrolysis rate allows growth. By adding rules to mimic the mechanical constraints present at the MT tip, the model generates tubulin-GTP caps similar in size to experimental estimates. Finally, by combining assembly/disassembly and cap dynamics, we generate MT dynamic instability with rates and transition frequencies similar to those measured experimentally. Our model serves as a platform to examine GTP-cap dynamics and allows predictions of how MT-associated proteins and other effectors alter the energetics of MT assembly.

248 citations

Journal ArticleDOI
TL;DR: This paper investigated the differential effects of two problem-solving instructional approaches, schema-based instruction (SBI) and general strategy instruction (GSI), on the mathematical word problem solving performance of 22 middle school students who had learning disabilities or were at risk for mathematics failure.
Abstract: This study investigated the differential effects of two problem-solving instructional approaches— schema-based instruction (SBI) and general strategy instruction (GSI)—on the mathematical word problem‐solving performance of 22 middle school students who had learning disabilities or were at risk for mathematics failure. Results indicated that the SBI group significantly outperformed the GSI group on immediate and delayed posttests as well as the transfer test. Implications of the study are discussed within the context of the new IDEA amendment and access to the general education curriculum.

248 citations


Authors

Showing all 12785 results

NameH-indexPapersCitations
Yang Yang1712644153049
Gang Chen1673372149819
Yi Yang143245692268
Mark D. Griffiths124123861335
Michael Gill12181086338
Masaki Mori110220066676
Kai Nan An10995351638
James R. Rice10827868943
Vinayak P. Dravid10381743612
Andrew M. Jones10376437253
Israel E. Wachs10342732029
Demetrios N. Christodoulides10070451093
Bert M. Weckhuysen10076740945
José Luis García Fierro100102747228
Mordechai Segev9972940073
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202338
2022140
20211,040
20201,054
2019933
2018935