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Articles 31 - 44 of 44
Full-Text Articles in Engineering
Investigation Of Contact Pressure Distribution On Sheet Metal Stamping Tooling Interfaces: Surface Modeling, Simulations, And Experriments, Sripati Sah
Masters Theses 1911 - February 2014
In stamping operations, sheet metal is formed into a desired shape by pressing it in a hydraulic or mechanical press between suitably shaped dies. As a predominant manufacturing process, sheet metal forming has been widely used for the production of automobiles, aircraft, home appliances, beverage cans and many other industrial and commercial products. A major effort till date on stamping processes monitoring has been focused on investigating variations in the press force. Given that the press force itself is an integral of the contact pressure distribution over the die and binder contact interfaces, it is conceivable that defects may be …
Synthesis And Adsorption Studies Of The Micro-Mesoporous Material Sba-15, Eunyoung You
Synthesis And Adsorption Studies Of The Micro-Mesoporous Material Sba-15, Eunyoung You
Masters Theses 1911 - February 2014
Over the past decades, there have been worldwide efforts to synthesize new types of ordered porous materials for catalysis, separations, etc. Among those, mesoporous material with microporous walls are promising in a sense that while mesopores act as channels for the reactant transport with little diffusion limitation, micropores in the wall act as active sites for reactions or storage of the molecules. In this study, we focused on the SBA-15 material, which is a highly ordered mesoporous silica material with micropores present in the wall. We have studied the synthesis of the material by manipulating various factors that are known …
Power Amplifier Linearization Implementation Using A Field Programmable Gate Array, Abilash Menon
Power Amplifier Linearization Implementation Using A Field Programmable Gate Array, Abilash Menon
Masters Theses 1911 - February 2014
The emphasis on higher data rates, spectral efficiency and cost reduction has driven the field towards linear modulation techniques such as quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM), wideband code division multiple access (WCDMA), and orthogonal frequency division multiplexing (OFDM). The result is a complex signal with a non-constant envelope and a high peak-to-average power ratio. This characteristic makes these signals particularly sensitive to the intrinsic nonlinearity of the RF power amplifier (PA) in the transmitter. The nonlinearity will generate intermodulation (IMD) components, also referred to as out-of-band emission or spectral re-growth, which interfere with adjacent channels. Such …
Synthesize A Nanoscale Ferrofluid, Rob Snyder
Synthesize A Nanoscale Ferrofluid, Rob Snyder
Nanotechnology Teacher Summer Institutes
The chemical synthesis of a ferrofluid is a nanoscale science activity that originally appears in the Journal of Chemical Education. Access to the following website requires a subscription to the journal. J. Chem. Educ., 76, 943-948 (1999). The article was authored by Jonathan Breitzer and George Lisensky.
Synergies Between Bio- And Oil Refineries For The Production Of Fuels From Biomass, George W. Huber, A. Corma
Synergies Between Bio- And Oil Refineries For The Production Of Fuels From Biomass, George W. Huber, A. Corma
George W. Huber
As petroleum prices continue to increase, it is likely that biofuels will play an ever-increasing role in our energy future. The processing of biomass-derived feedstocks (including cellulosic, starch- and sugar-derived biomass, and vegetable fats) by catalytic cracking and hydrotreating is a promising alternative for the future to produce biofuels, and the existing infrastructure of petroleum refineries is well-suited for the production of biofuels, allowing us to rapidly transition to a more sustainable economy without large capital investments for new reaction equipment. This Review discusses the chemistry, catalysts, and challenges involved in the production of biofuels.
Liquid-Phase Catalytic Processing Of Biomass-Derived Oxygenated Hydrocarbons To Fuels And Chemicals, George W. Huber, J. Chheda, J. A. Dumesic
Liquid-Phase Catalytic Processing Of Biomass-Derived Oxygenated Hydrocarbons To Fuels And Chemicals, George W. Huber, J. Chheda, J. A. Dumesic
George W. Huber
Biomass has the potential to serve as a sustainable source of energy and organic carbon for our industrialized society. The focus of this Review is to present an overview of chemical catalytic transformations of biomass-derived oxygenated feedstocks (primarily sugars and sugar-alcohols) in the liquid phase to value-added chemicals and fuels, with specific examples emphasizing the development of catalytic processes based on an understanding of the fundamental reaction chemistry. The key reactions involved in the processing of biomass are hydrolysis, dehydration, isomerization, aldol condensation, reforming, hydrogenation, and oxidation. Further, it is discussed how ideas based on fundamental chemical and catalytic concepts …
Calculation Of Free Energies And Chemical Potentials For Gas Hydrates Using Monte Carlo Simulations, Peter A. Monson, S. J. Wierzchowski
Calculation Of Free Energies And Chemical Potentials For Gas Hydrates Using Monte Carlo Simulations, Peter A. Monson, S. J. Wierzchowski
Peter A. Monson
We describe a method for calculating free energies and chemical potentials for molecular models of gas hydrate systems using Monte Carlo simulations. The method has two components: (i) thermodynamic integration to obtain the water and guest molecule chemical potentials as functions of the hydrate occupancy; (ii) calculation of the free energy of the zero-occupancy hydrate system using thermodynamic integration from an Einstein crystal reference state. The approach is applicable to any classical molecular model of a hydrate. We illustrate the methodology with an application to the structure-I methane hydrate using two molecular models. Results from the method are also used …
Stability And Transient Dynamics Of Thin Liquid Films Flowing Over Locally Heated Surfaces, N Tiwari, Z Mester, Jm Davis
Stability And Transient Dynamics Of Thin Liquid Films Flowing Over Locally Heated Surfaces, N Tiwari, Z Mester, Jm Davis
Jeffrey M. Davis
The dynamics and linear stability of a liquid film flowing over a locally heated surface are studied using a long-wave lubrication analysis. The temperature gradient at the leading edge of the heater induces a gradient in surface tension that opposes the gravitationally driven flow and leads to the formation of a pronounced capillary ridge. The resulting free-surface shapes are computed, and their stability to spanwise perturbations is analyzed for a range of Marangoni numbers, substrate inclination angles, and temperature profiles. Instability is predicted above a critical Marangoni number for a finite band of wave numbers separated from zero, which is …
Cavitation Rheology For Soft Materials, Jessica A. Zimberlin, Naomi Sanabria-Delong, Gregory N. Tewmassachusetts - Amherst, Alfred J. Crosby
Cavitation Rheology For Soft Materials, Jessica A. Zimberlin, Naomi Sanabria-Delong, Gregory N. Tewmassachusetts - Amherst, Alfred J. Crosby
Gregory N. Tew
To guide the development of tissue scaffolds and the characterization of naturally heterogeneous biological tissues, we have developed a method to determine the local modulus at an arbitrary point within a soft material. The method involves growing a cavity at the tip of a syringe needle and monitoring the pressure of the cavity at the onset of a mechanical instability. This critical pressure is directly related to the local modulus of the material. The results focus on the network development of poly(lactide)–poly(ethylene oxide)–poly(lactide) triblock copolymer and poly(vinyl alcohol) hydrogels. These materials serve as model materials for tissue scaffolds and soft …
Activity Of An Antimicrobial Peptide Mimetic Against Planktonic And Biofilm Cultures Of Oral Pathogens, Nicholas Beckloff, Danielle Laube, Tammy Castro, David Furgang, Steven Park, David Perlin, Dylan Clements, Haizhong Tang, Richard W. Scott, Gregory N. Tew, Gill Diamond
Activity Of An Antimicrobial Peptide Mimetic Against Planktonic And Biofilm Cultures Of Oral Pathogens, Nicholas Beckloff, Danielle Laube, Tammy Castro, David Furgang, Steven Park, David Perlin, Dylan Clements, Haizhong Tang, Richard W. Scott, Gregory N. Tew, Gill Diamond
Gregory N. Tew
Antimicrobial peptides (AMPs) are naturally occurring, broad-spectrum antimicrobial agents that have recently been examined for their utility as therapeutic antibiotics. Unfortunately, they are expensive to produce and are often sensitive to protease digestion. To address this problem, we have examined the activity of a peptide mimetic whose design was based on the structure of magainin, exhibiting its amphiphilic structure. We demonstrate that this compound, meta-phenylene ethynylene (mPE), exhibits antimicrobial activity at nanomolar concentrations against a variety of bacterial and Candida species found in oral infections. Since Streptococcus mutans, an etiological agent of dental caries, colonizes the tooth surface and forms …
Water Hammer Dissipation In Pneumatic Slug Tests, David Ostendorf, Don J. Degroot, Philip J. Dunaj
Water Hammer Dissipation In Pneumatic Slug Tests, David Ostendorf, Don J. Degroot, Philip J. Dunaj
David Ostendorf
We model and measure the dissipation of water hammer induced by well casing and water elasticity with rapid valve opening at the start of a pneumatic slug test. The higher-frequency water hammer can obscure slower, aquifer-controlled, underdamped oscillations of the rigid water column, so a quantitative description of the elastic motion improves the ability of a slug test to calibrate the aquifer permeability k. Internal friction attenuates the water hammer, subject to a known headspace pressure at the air/water interface and equilibrium pressure at the top of the well screen. An analytical elastic solution is presented and matched to an …
Modeling Traffic Flow Under Emergency Evacuation Situations: Current Practice And Future Directions, Kevin D. Moriarty, Daiheng Ni, John Collura
Modeling Traffic Flow Under Emergency Evacuation Situations: Current Practice And Future Directions, Kevin D. Moriarty, Daiheng Ni, John Collura
Daiheng Ni
The use of evacuation operations in response to emergency conditions has become commonplace. Until recently, planning and response operations have largely been the concern of emergency management personnel. The reoccurrence of catastrophic events, however, has transp ortation officials becoming in creasingly interested in working to improve evacuation efficiency. Emergency managers and transportation officials have employed the use of traffic simulation software to aid in evacuation planning and to evaluate evacuation operations. Effective emergency simulation software needs to be able to capture the major factors influencing evacuation response. This paper aims to discuss the broad role of transportation and the use …
On Inferring And Characterizing Internet Routing Policies, F Wang, L Gao
On Inferring And Characterizing Internet Routing Policies, F Wang, L Gao
Lixin Gao
No abstract provided.
Prediction-Based Routing For Vehicular Ad Hoc Networks, V Namboodiri, L Gao
Prediction-Based Routing For Vehicular Ad Hoc Networks, V Namboodiri, L Gao
Lixin Gao
No abstract provided.