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Full-Text Articles in Engineering
Cyber-Enabled Simulations In Nanoscale Science And Engineering Introduction, Alejandro Strachan, Gerhard Klimeck, Mark S. Lundstrom
Cyber-Enabled Simulations In Nanoscale Science And Engineering Introduction, Alejandro Strachan, Gerhard Klimeck, Mark S. Lundstrom
Gerhard Klimeck
Editorial Material
Coping With Diverse Student Backgrounds In A First Year Engineering Computing Subject, Ernest Y. Baafi, Michael J. Boyd, Sarah R. Lambert
Coping With Diverse Student Backgrounds In A First Year Engineering Computing Subject, Ernest Y. Baafi, Michael J. Boyd, Sarah R. Lambert
Sarah Lambert
Each year, students enrolled in the subject Engineering Computing 1 at the University of Wollongong, Wollongong, Australia, are surveyed on the first day of classes in order to assess their prior knowledge of the subject content. The survey results show considerable diversity in students’ backgrounds. On average, about 10% are not familiar with the use of personal computers (PCs), 5% have never used e-mail/World Wide Web, 30% have not used spreadsheets and 60% have not programmed in a high level language. However, within these averages are some students with advanced skills and others with quite limited skills. Many of those …
Hydration Repulsion Effects Of The Formation Of Supported Lipid Bylayers, Selver Ahmed, Rajesh Raman Madathingal, Stephanie L. Wunder, Yanjing Chen, Geoffrey D. Bothun
Hydration Repulsion Effects Of The Formation Of Supported Lipid Bylayers, Selver Ahmed, Rajesh Raman Madathingal, Stephanie L. Wunder, Yanjing Chen, Geoffrey D. Bothun
Geoffrey Bothun
When zwitterionic lipids fuse onto substrates such as silica (SiO2), the water of hydration between the two approaching surfaces must be removed, giving rise to an effective hydration repulsion. Removal of water around the polar headgroups of the lipid and the silanols (SiOH) of SiO2 allows supported lipid bilayer (SLB) formation, although an interstitial water layer remains between the lipid and surface. The importance of hydration repulsion in SLB formation is demonstrated by monitoring fusion of zwitterionic lipids onto silica (SiO2) nanoparticles heat treated to control the silanol group (SiOH) density and thus the amount of bound water. SLB formation, …
Mesophase Separation And Probe Dynamics In Protein-Polyelectrolyte Coacervates, A. Basak Kayitmazer, Himadri B. Bohidar, Kevin W. Mattison, Arijit Bose, Jayashri Sarkar, Akihito Hashidzume, Paul S. Russo, Werner Jaeger, Paul L. Dubin
Mesophase Separation And Probe Dynamics In Protein-Polyelectrolyte Coacervates, A. Basak Kayitmazer, Himadri B. Bohidar, Kevin W. Mattison, Arijit Bose, Jayashri Sarkar, Akihito Hashidzume, Paul S. Russo, Werner Jaeger, Paul L. Dubin
Arijit Bose
Protein–polyelectrolyte coacervates are self-assembling macroscopically monophasic biomacromolecular fluids whose unique properties arise from transient heterogeneities. The structures of coacervates formed at different conditions of pH and ionic strength from poly(dimethyldiallylammonium chloride) and bovine serum albumin (BSA), were probed using fluorescence recovery after photobleaching. Measurements of self-diffusion in coacervates were carried out using fluorescein-tagged BSA, and similarly tagged Ficoll, a non-interacting branched polysaccharide with the same size as BSA. The results are best explained by temporal and spatial heterogeneities, also inferred from static light scattering and cryo-TEM, which indicate heterogeneous scattering centers of several hundred nm. Taken together with previous dynamic …
Investigation Of Wetting Hydrodynamics Using Numerical Simulations, David E. Finlow, Prakash R. Kota, Arijit Bose
Investigation Of Wetting Hydrodynamics Using Numerical Simulations, David E. Finlow, Prakash R. Kota, Arijit Bose
Arijit Bose
We report some unusual structural transitions upon the addition of an amphiphilic biopolymer to unilamellar surfactant vesicles. The polymer is a hydrophobically modified chitosan and it embeds its hydrophobes in vesicle bilayers. We study vesicle-polymer mixtures using small-angle neutron scattering (SANS) and cryotransmission electron microscopy (cryo-TEM). When low amounts of the polymer are added to unilamellar vesicles of ca. 120 nm diameter, the vesicle size decreases by about 50%. Upon further addition of polymer, lamellar peaks are observed in the SANS spectra at high scattering vectors. We show that these spectra correspond to a co-existence of unilamellar and bilamellar vesicles. …
Large Scale Isolation Of Expression Vector Cassette By Magnetic Triple Helix Affinity Capture, Srinivas V. Sonti, Matthew C. Griffor, T. Sano, S. Narayanswami, Arijit Bose, C. R. Cantor, A. P. Kausch
Large Scale Isolation Of Expression Vector Cassette By Magnetic Triple Helix Affinity Capture, Srinivas V. Sonti, Matthew C. Griffor, T. Sano, S. Narayanswami, Arijit Bose, C. R. Cantor, A. P. Kausch
Arijit Bose
No abstract provided.
A Simple Extrusion Method For The Synthesis Of Aligned Silica Nanowires Using The Template Of A Rigid Surface Mesophase, Limin Liu, Grace Tan, Vivek Agarwal, Arijit Bose, Jibao He, Gary L. Mcpherson, Vijay T. John
A Simple Extrusion Method For The Synthesis Of Aligned Silica Nanowires Using The Template Of A Rigid Surface Mesophase, Limin Liu, Grace Tan, Vivek Agarwal, Arijit Bose, Jibao He, Gary L. Mcpherson, Vijay T. John
Arijit Bose
Long range alignment of silica nanowires has been accomplished by extrusion of a novel surfactant mesophase prior to silica synthesis.
Synthesis Of Aluminum Hydroxide Nanoparticles In Spontaneously Generated Vesicles, Iskandar I. Yaacob, Suhas Bhandarkar, Arijit Bose
Synthesis Of Aluminum Hydroxide Nanoparticles In Spontaneously Generated Vesicles, Iskandar I. Yaacob, Suhas Bhandarkar, Arijit Bose
Arijit Bose
Sessile drops of aqueous electrolyte as well as cationic and anionic surfactant solutions are placed on the lower plate of a stainless steel parallel plate capacitor and the variation of static advanced contact angles with the field strength between the plates is monitored. Even at field strengths where changes in electrical body forces are negligible, these drops spreads outward, irreversibly, in response to variations in the externally applied potential gradient. Contact angles always decrease, regardless of the polarity of the applied electric field. However, the magnitude of the change is sensitive to both the polarity and strength of the field. …
Transition From Unilamellar To Bilameller Vesicles Induced By An Amphiphilic Biopolymer, Jae-Ho Lee, Vivek Argarwal, Arijit Bose, Gregory F. Payne, Srinivasa R. Raghavan
Transition From Unilamellar To Bilameller Vesicles Induced By An Amphiphilic Biopolymer, Jae-Ho Lee, Vivek Argarwal, Arijit Bose, Gregory F. Payne, Srinivasa R. Raghavan
Arijit Bose
We report some unusual structural transitions upon the addition of an amphiphilic biopolymer to unilamellar surfactant vesicles. The polymer is a hydrophobically modified chitosan and it embeds its hydrophobes in vesicle bilayers. We study vesicle-polymer mixtures using small-angle neutron scattering (SANS) and cryotransmission electron microscopy (cryo-TEM). When low amounts of the polymer are added to unilamellar vesicles of ca. 120 nm diameter, the vesicle size decreases by about 50%. Upon further addition of polymer, lamellar peaks are observed in the SANS spectra at high scattering vectors. We show that these spectra correspond to a co-existence of unilamellar and bilamellar vesicles. …
Numerical Investigation Of Boundary Conditions For Moving Contact Line Problems, Sandesh Somalinga, Arijit Bose
Numerical Investigation Of Boundary Conditions For Moving Contact Line Problems, Sandesh Somalinga, Arijit Bose
Arijit Bose
When boundary conditions arising from the usual hydrodynamic assumptions are applied, analyses of dynamic wetting processes lead to a well-known nonintegrable stress singularity at the dynamic contact line, necessitating new ways to model this problem. In this paper, numerical simulations for a set of representative problems are used to explore the possibility of providing material boundary conditions for predictive models of inertialess moving contact line processes. The calculations reveal that up to Capillary number Ca50.15, the velocity along an arc of radius 10Li (Li is an inner, microscopic length scale! from the dynamic contact line is independent of the macroscopic …
Development Of A New Lagrangian Float For Studying Coastal Marine Ecosystems, Alex Schwithal, Chris Roman
Development Of A New Lagrangian Float For Studying Coastal Marine Ecosystems, Alex Schwithal, Chris Roman
Christopher N. Roman
This paper presents an overview and initial testing results for a shallow water Lagrangian float designed to operate in coastal settings. The presented effort addresses the two main characteristics of the shallow coastal environment that preclude the direct of use of many successfully deep water floats, namely the higher variation of water densities near the coast compared with the open ocean and the highly varied bathymetry. Our idea is to develop a high capacity dynamic auto-ballasting system that is able to compensate for the expected seawater density variation over a broad range of water temperatures and salinities while using measurements …