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Articles 1 - 17 of 17
Full-Text Articles in Engineering
54th Spsj Annual Meeting Yokohama, Japan, May 25-27, 2005, Jane C. Vogl, Hiroyuki Ohno
54th Spsj Annual Meeting Yokohama, Japan, May 25-27, 2005, Jane C. Vogl, Hiroyuki Ohno
Otto Vogl
No abstract provided.
Macromolecules In Graz, Austria, December 3, 2004, Otto Vogl, Volker Ribitsch
Macromolecules In Graz, Austria, December 3, 2004, Otto Vogl, Volker Ribitsch
Otto Vogl
No abstract provided.
In-Situ High-Energy X-Ray Diffraction Study Of The Local Structure Of Supercooled Liquid Si, Robert Hyers, A. I. Goldman, K. F. Kelton, D. S. Robinson, J. R. Rogers, T. J. Rathz, A. K. Gangopadhyay, B. Sieve, G. W. Lee, T. H. Kim
In-Situ High-Energy X-Ray Diffraction Study Of The Local Structure Of Supercooled Liquid Si, Robert Hyers, A. I. Goldman, K. F. Kelton, D. S. Robinson, J. R. Rogers, T. J. Rathz, A. K. Gangopadhyay, B. Sieve, G. W. Lee, T. H. Kim
Robert Hyers
Employing the technique of electrostatic levitation, coupled with high-energy x-ray diffraction and rapid data acquisition methods, we have obtained high quality structural data more deeply into the supercooled regime of liquid silicon than has been possible before. No change in coordination number is observed in this temperature region, calling into question previous experimental claims of structural evidence for the existence of a liquid-liquid phase transition.
A Self-Consistent Transport Model For Molecular Conduction Based On Extended Hückel Theory With Full Three-Dimensional Electrostatics, Eric Polizzi, S. Datta, L. Siddiqui, A. Ghosh, M. Paulsson, F. Zahid
A Self-Consistent Transport Model For Molecular Conduction Based On Extended Hückel Theory With Full Three-Dimensional Electrostatics, Eric Polizzi, S. Datta, L. Siddiqui, A. Ghosh, M. Paulsson, F. Zahid
Eric Polizzi
We present a transport model for molecular conduction involving an extended Hückel theoretical treatment of the molecular chemistry combined with a nonequilibrium Green’s function treatment of quantum transport. The self-consistent potential is approximated by CNDO (complete neglect of differential overlap) method and the electrostatic effects of metallic leads (bias and image charges) are included through a three-dimensional finite element method. This allows us to capture spatial details of the electrostatic potential profile, including effects of charging, screening, and complicated electrode configurations employing only a single adjustable parameter to locate the Fermi energy. As this model is based on semiempirical methods …
Mixed Monolayer Coverage On Gold Nanoparticles For Interfacial Stabilization Of Immiscible Fluids, Elizabeth Glogowski, Jinbo He, Thomas P. Russell, Todd S. Emrick
Mixed Monolayer Coverage On Gold Nanoparticles For Interfacial Stabilization Of Immiscible Fluids, Elizabeth Glogowski, Jinbo He, Thomas P. Russell, Todd S. Emrick
Todd S. Emrick
Gold nanoparticles covered with a mixed monolayer of n-dodecanethiol and 11-mercapto-1-undecanol were prepared and found to mediate the oil–water interface, providing access to stable water droplets in oil.
A Theoretical Investigation Of Surface Roughness Scattering In Silicon Nanowire Transistors, Eric Polizzi, M. Lundstrom, S. Datta, A. Ghosh, J. Wang
A Theoretical Investigation Of Surface Roughness Scattering In Silicon Nanowire Transistors, Eric Polizzi, M. Lundstrom, S. Datta, A. Ghosh, J. Wang
Eric Polizzi
Using a full three-dimensional (3D), quantum transport simulator, we theoretically investigate the effects of surface roughness scattering (SRS) on the device characteristics of Si nanowire transistors (SNWTs). The microscopic structure of the Si/SiO2 interface roughness is directly treated by using a 3D finite element technique. The results show that (1) SRS reduces the electron density of states in the channel, which increases the SNWT threshold voltage, and (2) the SRS in SNWTs becomes less effective when fewer propagating modes are occupied, which implies that SRS is less important in small-diameter SNWTs with few modes conducting than in planar metal-oxide-semiconductor field-effect-transistors …
Inverse Density Functional Theory As An Interpretive Tool For Measuring Colloid-Surface Interactions In Dense Systems, David M. Ford, Mingqing Lu, Michael A. Bevan
Inverse Density Functional Theory As An Interpretive Tool For Measuring Colloid-Surface Interactions In Dense Systems, David M. Ford, Mingqing Lu, Michael A. Bevan
David M Ford
Recent advances in optical microscopy, such as total internal reflection and confocal scanning laser techniques, now permit the direct three-dimensional tracking of large numbers of colloidal particles both near and far from interfaces. A novel application of this technology, currently being developed by one of the authors under the name of diffusing colloidal probe microscopy (DCPM), is to use colloidal particles as probes of the energetic characteristics of a surface. A major theoretical challenge in implementing DCPM is to obtain the potential energy of a single particle in the external field created by the surface, from the measured particle trajectories …
Multiple Imputation Scheme For Overcoming The Missing Values And Variability Issues In Its Data, Daiheng Ni, John D. Leonard Ii, Angshuman Guin, Chunxia Feng
Multiple Imputation Scheme For Overcoming The Missing Values And Variability Issues In Its Data, Daiheng Ni, John D. Leonard Ii, Angshuman Guin, Chunxia Feng
Daiheng Ni
Traffic engineering studies such as validating Highway Capacity Manual (HCM) models require complete and reliable field data. However, the wealth of intelligent transportation systems (ITS) data is sometimes rendered useless for these purposes because of missing values in the data. Many imputation techniques have been developed in the past with virtually all of them imputing a single value for a missing datum. While this provides somewhat simple and fast estimates, it does not eliminate the possibility of producing biased results and it also fails to account for the uncertainty brought about by missing data. To overcome these limitations, a multiple …
Experimental And Dft Studies Of The Conversion Of Ethanol And Acetic Acid On Ptsn-Based Catalysts, George W. Huber, R. Acal, J. W. Shabaker, M. A. Sanchez-Castillo, J. A. Dumesic
Experimental And Dft Studies Of The Conversion Of Ethanol And Acetic Acid On Ptsn-Based Catalysts, George W. Huber, R. Acal, J. W. Shabaker, M. A. Sanchez-Castillo, J. A. Dumesic
George W. Huber
Reaction kinetics studies were conducted for the conversions of ethanol and acetic acid over silica-supported Pt and Pt/Sn catalysts at temperatures from 500 to 600 K. Addition of Sn to Pt catalysts inhibits the decomposition of ethanol to CO, CH4, and C2H6, such that PtSn-based catalysts are active for dehydrogenation of ethanol to acetaldehyde. Furthermore, PtSn-based catalysts are selective for the conversion of acetic acid to ethanol, acetaldehyde, and ethyl acetate, whereas Pt catalysts lead mainly to decomposition products such as CH4 and CO. These results are interpreted using density functional theory (DFT) calculations for various adsorbed species and transition …
Asymptotic Analysis Of Liquid Films Dip-Coated Onto Chemically Micropatterned Surfaces, Jm Davis
Asymptotic Analysis Of Liquid Films Dip-Coated Onto Chemically Micropatterned Surfaces, Jm Davis
Jeffrey M. Davis
The dip coating of chemically heterogeneous surfaces is a useful technique for attaining selective material deposition. For the case of vertical, wetting stripes surrounded by nonwetting regions, experiments have demonstrated that the thickness of the entrained film on the stripes is significantly different than on homogeneous surfaces because of the lateral confinement of the liquid. In the present work, the asymptotic matching of equations based on lubrication theory is used to determine the film thickness, and necessary restrictions on the capillary and Bond numbers are provided. The predictions are in excellent agreement with the existing experimental data, and the classical …
Surface Smoothening Mechanism Of Amorphous Silicon Thin Films, Dimitrios Maroudas, E. S. Aydil, T Bakos, M. S. Valipa
Surface Smoothening Mechanism Of Amorphous Silicon Thin Films, Dimitrios Maroudas, E. S. Aydil, T Bakos, M. S. Valipa
Dimitrios Maroudas
An important concern in the deposition of thin hydrogenated amorphous silicon (a-Si∶H) films is to obtain smooth surfaces. Herein, we combine molecular-dynamics simulations with first-principles density functional theory calculations to elucidate the smoothening mechanism of plasma deposited a-Si∶H thin films. We show that the deposition precursor may diffuse rapidly on the a-Si∶H film surface via overcoordinated surface Si atoms and incorporate into the film preferentially in surface valleys, with activation barriers for incorporation dependent on the local surface morphology. Experimental data on smoothening and precursor diffusion are accounted for.
Generalized Linear Stability Of Noninertial Coating Flows Over Topographical Features, Jm Davis, Sm Troian
Generalized Linear Stability Of Noninertial Coating Flows Over Topographical Features, Jm Davis, Sm Troian
Jeffrey M. Davis
The transient evolution of perturbations to steady lubrication flow over a topographically patterned surface is investigated via a nonmodal linear stability analysis of the non-normal disturbance operator. In contrast to the capillary ridges that form near moving contact lines, the stationary capillary ridges near trenches or elevations have only stable eigenvalues. Minimal transient amplification of perturbations occurs, regardless of the magnitude or steepness of the topographical features. The absence of transient amplification and the stability of the ridge are explained on physical grounds. By comparison to unstable ridge formation on smooth, flat, and homogeneous surfaces, the lack of closed, recirculating …
New Properties From Pla–Peo–Pla Hydrogels, Gregory N. Tew, Naomi Sanabria-Delong, Sarvesh K. Agrawal, Surita R. Bhatia
New Properties From Pla–Peo–Pla Hydrogels, Gregory N. Tew, Naomi Sanabria-Delong, Sarvesh K. Agrawal, Surita R. Bhatia
Gregory N. Tew
Polymeric materials are important in many medical applications. Regenerative medicine offers the potential to repair or replace damaged tissue and polymers are an essential component of many tissue engineering approaches. Hydrogels have many advantageous properties but, generally, lack robust mechanical properties. At the same time, mounting evidence points to the importance of the matrix modulus when constructing devices. In this context, triblock copolymers made from poly(L-lactide)–poly(ethylene glycol)–poly(L-lactide) have been prepared and formulated into hydrogels. Investigations into their mechanical properties found the elastic modulus to be greater than 10 kPa which is at least one order of magnitude stiffer than previously …
Synthesis Of Urea Oligomers And Their Antibacterial Activity, Haizhong Tang, Robert J. Doerksen, Gregory N. Tew
Synthesis Of Urea Oligomers And Their Antibacterial Activity, Haizhong Tang, Robert J. Doerksen, Gregory N. Tew
Gregory N. Tew
Facially amphiphilic urea oligomers were successfully prepared in a one-pot reaction by carbonyl diimidazole (CDI) coupling and showed greater antibacterial activity against both Gram-negative Escherichia coli and Gram-positive Bacillus subtilis than MSI-78.
Markov Chain Monte Carlo Multiple Imputation For Incomplete Its Data Using Bayesian Networks, Daiheng Ni, John D. Leonard
Markov Chain Monte Carlo Multiple Imputation For Incomplete Its Data Using Bayesian Networks, Daiheng Ni, John D. Leonard
Daiheng Ni
The rich ITS data is a precious resource for transportatio n researchers and practitioners. However, the usability of such resource is greatly limited by the issue of data missing. A lot of imputation methods have been proposed in the past decade. However, some issues ar e still not or not sufficiently addresse d. For example, the missing of entire records, temporal correlation in observations, natural char acteristics in raw data, and unbiased estimates for missing values. With these in mind, this paper proposes an advanced imputation method which is based on the recent development in other disciplines, especially applied statistics …
Energy Efficient Broadcast In Wireless Ad Hoc Networks With Hitch-Hiking, M Agarwal, Lx Gao, Jh Cho, J Wu
Energy Efficient Broadcast In Wireless Ad Hoc Networks With Hitch-Hiking, M Agarwal, Lx Gao, Jh Cho, J Wu
Lixin Gao
No abstract provided.
The Monitoring And Early Detection Of Internet Worms, Cc Zou, Wb Gong, D Towsley, Lx Gao
The Monitoring And Early Detection Of Internet Worms, Cc Zou, Wb Gong, D Towsley, Lx Gao
Lixin Gao
No abstract provided.