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- 07. Selected Conferences on Polymer Science (4)
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Articles 1 - 27 of 27
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
Emeritus Faculty Author Gallery
No abstract provided.
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
Emeritus Faculty Author Gallery
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.
Natural Organic Matter: A Study Of Long-Term Variability And Anthropogenic Influence, Gregory D. Devine
Natural Organic Matter: A Study Of Long-Term Variability And Anthropogenic Influence, Gregory D. Devine
Environmental & Water Resources Engineering Masters Projects
Disinfection byproducts may be carcinogenic compounds and are present within most drinking water supply systems. These hannful compounds result from an mteraction between natural organic matter and conventional disinfectants such as chlorine or chlorine-based solutions. The level of disinfection byproducts within a distribution system is controlled by federal and state regulations; pending federal regulations propose increasingly stringent allowable levels of disinfection byproducts. The goals of this investigation were to 1) identify long-term variability associated with natural organic matter across the country, 2) develop empirical relationships between anthropogenic activity, land use/land cover and natural organic matter and 3) construct a mechanistic …
Deicer Source Hindcasting In An Unconfined Roadside Aquifer, Ivonne Hall
Deicer Source Hindcasting In An Unconfined Roadside Aquifer, Ivonne Hall
Environmental & Water Resources Engineering Masters Projects
Deicing materials that include calcium magnesium acetate (CMA), road salt, and premix are applied over a 1.2 mile section of the highway on State Route 25 (SR25) in Plymouth, Massachusetts. This part of the highway was designed to route runoff to an infiltration basin. The main goal of this research was to evaluate when and where deicer contamination infiltrated to the groundwater table at the site, with a focus on the infiltration basin. This project evaluated the steady-state hydraulics of the site, as well as the fate and transport of the deicing materials. There are many sources of data available …
Characterization Of Storm Events Using An Automated Sampler, Shem Styger
Characterization Of Storm Events Using An Automated Sampler, Shem Styger
Environmental & Water Resources Engineering Masters Projects
The goal of this research was to evaluate the use of an automated sampler in profiling concentrations of deicing agents in stonnmnoff at a research site in Plymouth, MA. The Massachusetts Highway Department applies a combination of deicing agents in the form of salt, premix and calcium magnesium acetate (CMA) to an 830 m long stretch of State Route 25 during the months of November to April when driving conditions are hazardous. Portions of the applied deicing agents applied are left behind in a depression storage layer which was found to be 2.67 mm. The depression storage layer govems the …
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 …
Nonlinear Response Of Head Dependent Boundary Conditions In Modflow, Aparna S. Vemuri
Nonlinear Response Of Head Dependent Boundary Conditions In Modflow, Aparna S. Vemuri
Environmental & Water Resources Engineering Masters Projects
Engineering is the professional art of applying science to the optimum conversion of natural resources to the benefit of man. - Ralph J. Smith Groundwater mining reduces water levels in the subsurface and is found to have grave consequences like natural aquifer depletion. Groundwater management models that couple simulation models with optimization models have been used in the management of groundwater resources. The effect of head dependent boundary conditions on the head response due to pumping stresses is studied along with its impact on management strategies. Hypothetical aquifer models have been set up using MODFLOW 2000 and groundwater management (GWM) …
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 …
Water Distribution Analysis And Modeling For Stamford, Connecticut, Robert W. Best
Water Distribution Analysis And Modeling For Stamford, Connecticut, Robert W. Best
Environmental & Water Resources Engineering Masters Projects
The Aquarion Water Company (AWe) has funded several research studies. Performed by graduate students at the University of Massachusetts at Amherst, including this research on the Stamford, Connecticut water distribution system (WDS). Some of the recent research has been performed in response to the proposed Stage II Disinfectants/Disinfection By-Product (DBP) Rule (S2DDBPR) (US EPA, 2003). Due to the new requirements that fall under the pmposed S2DDBPR, an initial distribution system evaluation (IDSE) on the Stamford WDS is required to locate potential monitoring sites for compliance with DSP regulations. Between July 2002 and August 2003, three field study events (summer 2002, …
Modeling Natural, Organic Matter In An Unfiltered Surface Water Supply, Daniel R. Buttrick
Modeling Natural, Organic Matter In An Unfiltered Surface Water Supply, Daniel R. Buttrick
Environmental & Water Resources Engineering Masters Projects
Wachusett Reservoir, located in central Massachusetts, supplies water to the Boston, Massachusetts metropolitan area. The reservoir receives water from a watershed of 117 square miles, as well as water transferred from the Quabbin Reservoir to the west. Quabbin Reservoir water generally has lower levels of most water quality constituents than water received from the Wachusett Reservoir watershed. The Massachusetts Department of Conservation and Recreation (DCR) manages the watershed and monitors tributary and in-reservoir water quality, while the Massachusetts Water Resources Authority (MWRA) is responsible for treatment and distribution. CE QUAL W2 is a two dimensional, laterally averaged water quantity and …
Genome-Wide Requirements For Resistance To Functionally Distinct Dna-Damaging Agents, Patrick Flaherty
Genome-Wide Requirements For Resistance To Functionally Distinct Dna-Damaging Agents, Patrick Flaherty
Mathematics and Statistics Department Faculty Publication Series
The mechanistic and therapeutic differences in the cellular response to DNA-damaging compounds are not completely understood, despite intense study. To expand our knowledge of DNA damage, we assayed the effects of 12 closely related DNA-damaging agents on the complete pool of ;4,700 barcoded homozygous deletion strains of Saccharomyces cerevisiae. In our protocol, deletion strains are pooled together and grown competitively in the presence of compound. Relative strain sensitivity is determined by hybridization of PCR-amplified barcodes to an oligonucleotide array carrying the barcode complements. These screens identified genes in well-characterized DNAdamage-response pathways as well as genes whose role in the DNA-damage …
A Latent Variable Model For Chemogenomic Profiling, Patrick Flaherty
A Latent Variable Model For Chemogenomic Profiling, Patrick Flaherty
Mathematics and Statistics Department Faculty Publication Series
Motivation: In haploinsufficiency profiling data, pleiotropic genes are often misclassified by clustering algorithms that impose the constraint that a gene or experiment belong to only one cluster. We have developed a general probabilistic model that clusters genes and experiments without requiring that a given gene or drug only appear in one cluster. The model also incorporates the functional annotation of known genes to guide the clustering procedure. Results: We applied our model to the clustering of 79 chemogenomic experiments in yeast. Known pleiotropic genes PDR5 and MAL11 are more accurately represented by the model than by a clustering procedure that …
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.