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Articles 1 - 30 of 91
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Polymeric Ionic Liquids As Co2 Selective Sorbent Coatings For Solid-Phase Microextraction, Qichao Zhao, Jonathan C. Wajert, Jared L. Anderson
Polymeric Ionic Liquids As Co2 Selective Sorbent Coatings For Solid-Phase Microextraction, Qichao Zhao, Jonathan C. Wajert, Jared L. Anderson
Jared L. Anderson
Two polymeric ionic liquids (PIL) were synthesized and employed as sorbent coatings in solid-phase microextraction (SPME) for the selective extraction of CO2. The two coatings, poly(1-vinyl-3-hexylimidazolium) bis[(trifluoromethyl)sulfonyl]imide [poly(VHIM-NTf2)] and poly(1-vinyl-3-hexylimidazolium) taurate [poly(VHIM-taurate)], exhibited varied selectivity toward CO2 due to functional groups within in the PIL that imparted different mechanisms of CO2 capture. Extraction efficiencies were compared to those of two commercial SPME fibers [poly(dimethylsiloxane) (PDMS) and Carboxen−PDMS]. The poly(VHIM-NTf2) PIL fiber exhibited comparable extraction efficiency at high CO2 pressure compared to the Carboxen−PDMS fiber, even though the PIL-based fibers possessed much smaller film thicknesses. Calibration curves generated in pure CO2 …
A Holistic Model Of Engaged Scholarship: Telling The Story Across Higher Education's Missions, Nancy K. Franz
A Holistic Model Of Engaged Scholarship: Telling The Story Across Higher Education's Missions, Nancy K. Franz
Nancy K. Franz
Faculty and administrators still struggle to practice and support a holistic approach to engaged scholarship. Many institutions have created a culture of engaged scholarship, yet faculty are looking for practical ways to plan, implement, and reflect on engaged scholarship due to productivity expectations. New faculty are often drawn to the idea of engaged scholarship but don’t know where to start or how to frame their work in a way that appeals to promotion and tenure committees. To address these issues, the holistic model of engaged scholarship presented here provides a definition of engaged scholarship, six practice and storytelling leverage points …
Numerical Prediction Of Exhaust Fan-Tone Noise From High-Bypass Aircraft Engines, Anupam Sharma, Simon K. Richards, Trevor H. Wood, Chingwei Shieh
Numerical Prediction Of Exhaust Fan-Tone Noise From High-Bypass Aircraft Engines, Anupam Sharma, Simon K. Richards, Trevor H. Wood, Chingwei Shieh
Anupam Sharma
The ability to accurately predict fan noise is important in designing and optimizing high-bypass aircraft engines for low noise emissions. In this paper, a prediction methodology for exhaust fan-tone noise analysis is described and validated against various canonical test cases and NASA Source Diagnostic Test data (Heidelberg, L. J., "Fan Noise Source Diagnostic Test-Tone Modal Structure Results," NASA TM-2002-211594, 2002.). The prediction process consists of solving Reynolds-averaged Navier-Stokes equations to compute the fan wake and calculating the acoustic response of the outlet guide vanes to the fan wake using linearized Euler equations. Very good agreement is observed between the numerical …
Modeling The Effects Of Pelleting On The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Modeling The Effects Of Pelleting On The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Kurt A. Rosentrater
The energy security needs of energy importing nations continue to escalate. It is clear that biofuels can help meet some of the increasing need for energy. Theoretically, these can be produced from a variety of biological materials, including agricultural residues (such as corn stover and wheat straw), perennial grasses, legumes, algae, and other biological materials. Currently, however, the most heavily utilized material is corn starch. Industrial fuel ethanol production in the US primarily uses corn, because it is readily converted into fuel at a relatively low cost compared to other biomass sources. The production of corn-based ethanol in the US …
Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane D. Johnson
Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane D. Johnson
Duane D. Johnson
Hexagonal-close-packed (hcp) γ-precipitates with large aspect ratios form rapidly in some face-centered cubic (fcc) solid-solutions. No model explains the observed time-dependent increase in aspect ratio, nor irregular intermediate growth shapes. We propose a nonequilibrium process involving trapezoidal offshoots (controlled only by energetics) that governs the growth behavior (kinetics) and yields nonequilibrium structures in agreement with observation. Then, combining nucleation theory and diffusion-limited growth both of secondary nuclei and ledges, we derive a general growth equation for γ-precipitates due to solute-segregation to precipitate–matrix interfaces that includes our modification of the Jones–Trivedi model for thickening to account for the slow growth of …
An Examination Of Persistence Research Through The Lens Of A Comprehensive Conceptual Framework, Robert D. Reason
An Examination Of Persistence Research Through The Lens Of A Comprehensive Conceptual Framework, Robert D. Reason
Robert D Reason
Arguably, student retention has been the primary goal for higher education institutions for several decades. Certainly, it has been the focus of much research effort among higher education scholars. Unfortunately, efforts to improve retention seem to be ineffective; attrition rates have endured despite significant efforts to close them (ACT, 2004b; Braxton, Brier, & Steele, 2007; Terenzini, Cabrera, & Bernal, 2001). Notwithstanding the emphasis placed on student retention, decades of research, and countless institutional initiatives, slightly over half of students who begin a bachelor’s degree program at a four year college or university will complete their degree at that same institution …
Bipolar Electrode Focusing: The Effect Of Current And Electric Field On Concentration Enrichment, Robbyn K. Perdue, Derek R. Laws, Dzmitry Hlushkou, Ulrich Tallarek, Richard M. Crooks
Bipolar Electrode Focusing: The Effect Of Current And Electric Field On Concentration Enrichment, Robbyn K. Perdue, Derek R. Laws, Dzmitry Hlushkou, Ulrich Tallarek, Richard M. Crooks
Robbyn Anand
Bipolar electrode focusing at discontinuous bipolar electrodes (BPEs) provides new insight into the faradaic current and electric field characteristics associated with the technique and allows for the controlled transport of a focused anionic tracer in a microfluidic channel. The findings corroborate our previously reported simulation results, which describe the formation of an extended electric field gradient leading to concentration enrichment. This gradient has been attributed to the passage of faradaic current through a BPE affixed to the floor of the microchannel. Our results demonstrate that the onset of faradaic current is coincident with the onset of concentration enrichment. Utilizing an …
Intelligent Controller For Smart Base Isolation Of Masonry Structures, Simon Laflamme, T.Y. Yu, Jerome J. Connor
Intelligent Controller For Smart Base Isolation Of Masonry Structures, Simon Laflamme, T.Y. Yu, Jerome J. Connor
Simon Laflamme
In this paper, an intelligent controller to control a smart base-isolated masonry structure is proposed. The smart base isolation consists of rubber bearings and a magnetorheological damper. This semi-active scheme takes advantage of the low power requirement of magnetorheological devices to achieve structural control. The controller is capable of mapping the behaviour of the controlled structure sequentially, using a self-organizing neural network which has time-varying learning rates. This neurocontroller is augmented by a sliding mode controller to account for the uncertainty on the semi-active damping forces. Wavelets are used as functions in the single hidden layer for their capability of …
Costs Of Pelleting To Enhance The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Costs Of Pelleting To Enhance The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Kurt A. Rosentrater
Biofuels, especially corn-based ethanol, can help meet some of the increasing demand for transportation fuels. Currently, the most heavily utilized substrate is corn grain, which is readily converted into ethanol at a relatively low cost compared to other biomass sources. The production of ethanol in the U.S. has been dramatically increasing during the last several years; so too has the quantity of manufacturing coproducts. These nonfermentable residues are most often dried and sold as distillers dried grains with solubles – DDGS. Even though these materials are used to feed livestock in local markets, as the size of the industry continues …
Competition Between Multiple Totally Asymmetric Simple Exclusion Processes For A Finite Pool Of Resources, L. Jonathan Cook, R. K. P. Zia, Beate Schmittmann
Competition Between Multiple Totally Asymmetric Simple Exclusion Processes For A Finite Pool Of Resources, L. Jonathan Cook, R. K. P. Zia, Beate Schmittmann
Beate Schmittmann
Using Monte Carlo simulations and a domain-wall theory, we discuss the effect of coupling several totally asymmetric simple exclusion processes (TASEPs) to a finite reservoir of particles. This simple model mimics directed biological transport processes in the presence of finite resources such as protein synthesis limited by a finite pool of ribosomes. If all TASEPs have equal length, we find behavior which is analogous to a single TASEP coupled to a finite pool. For the more generic case of chains with different lengths, several unanticipated regimes emerge. A generalized domain-wall theory captures our findings in good agreement with simulation results.
Optimal Site-Centered Electronic Structure Basis Set From A Displaced-Center Expansion: Improved Results Via A Priori Estimates Of Saddle Points In The Density, Aftab Alam, Duane D. Johnson
Optimal Site-Centered Electronic Structure Basis Set From A Displaced-Center Expansion: Improved Results Via A Priori Estimates Of Saddle Points In The Density, Aftab Alam, Duane D. Johnson
Duane D. Johnson
Site-centered, electronic-structure methods use an expansion inside nonoverlapping “muffin-tin” (MT) spheres plus an interstitial basis set. As the boundary separating the more spherical from nonspherical density between atoms, the “saddle-point” radii (SPR) in the density provide an optimal spherical region for expanding in spherical harmonics, as used in augmented plane wave, muffin-tin orbital, and multiple-scattering [Korringa, Kohn, and Rostoker (KKR)] methods. These MT-SPR guarantee unique, convex Voronoi polyhedra at each site, in distinction to Bader topological cells. We present a numerically fast, two-center expansion to find SPR a priori from overlapping atomic charge densities, valid also for disordered alloys. We …
Visualising Rationale In The Cpm, David H. Mott, Michael C. Dorneich
Visualising Rationale In The Cpm, David H. Mott, Michael C. Dorneich
Michael C. Dorneich
Rationale is being explored by the ITA in planning, for shared understanding of plans, and for capturing dependencies between assumptions/decisions and parts of the plan. Informal rationale captured during evaluation of the Collaborative Planning Model has been explored in terms of alternative visual representations and questions that these raise.
Improving Shared Understanding In Multilevel Planning, Michael C. Dorneich, David Mott, Ali Bahrami, Jitu Patel
Improving Shared Understanding In Multilevel Planning, Michael C. Dorneich, David Mott, Ali Bahrami, Jitu Patel
Michael C. Dorneich
Planning is a specific example of a problem solving activity that is undertaken across multiple (human) collaborative agents. In order to collaborate, these humans need to form a shared understanding of various aspects of the plan, mutual goals, the contexts of the other agents, and the rationale for others decisions and assumptions. Failure to reach this shared understanding can have serious implications to the success of the resulting plan. Currently plans are developed and shared with peer and subordinate units in a static format such as text, diagrams and spreadsheets which do not normally contain any of the reasoning, logic …
Bipolar Electrode Focusing: Simultaneous Concentration Enrichment And Separation In A Microfluidic Channel Containing A Bipolar Electrode, Derek R. Laws, Dzmitry Hlushkou, Robbyn K. Perdue, Ulrich Tallarek, Richard M. Crooks
Bipolar Electrode Focusing: Simultaneous Concentration Enrichment And Separation In A Microfluidic Channel Containing A Bipolar Electrode, Derek R. Laws, Dzmitry Hlushkou, Robbyn K. Perdue, Ulrich Tallarek, Richard M. Crooks
Robbyn Anand
A method for simultaneously concentrating and separating analytes in a buffer-filled microfluidic channel is reported. The approach is based on modulation of the local electric field within the channel and the corresponding opposition of electrophoretic and electroosmotic flow (EOF) velocities. Dye molecules having different electrophoretic mobilities are focused at different locations within the channel where concentration takes place. At least three species, all small dye molecules, can be simultaneously concentrated and separated, with localized enrichment factors up to ∼600 achieved within 400 s. The enrichment zones affect the electric field profile, as evidenced by significant differences in focusing of single …
The Effects Of Extrusion Processing Of Distillers Dried Grains With Solubles (Ddgs)-Based Yellow Perch (Perca Flavescens) Feeds, Ferouz Y. Ayadi, Kasiviswanathan Muthukumarappan, Kurt A. Rosentrater, Michael L. Brown
The Effects Of Extrusion Processing Of Distillers Dried Grains With Solubles (Ddgs)-Based Yellow Perch (Perca Flavescens) Feeds, Ferouz Y. Ayadi, Kasiviswanathan Muthukumarappan, Kurt A. Rosentrater, Michael L. Brown
Kurt A. Rosentrater
This study was conducted to investigate the production of balanced diets for juvenile yellow perch (Perca flavescens) feeds. Six isocaloric (~ 3.21 kcal/g), isonitrogenous (31.5% db) ingredient blends were formulated with 0, 10, 20, 30, 40, and 50% distillers dried grains with solubles (DDGS) at a feed moisture content of 60-65% db, with appropriate amounts of soybean meal, fish meal, vitamin and mineral mix. Extrusion cooking was performed using a laboratory-scale single screw extruder at a constant barrel temperature profile of 40ºC-90ºC-100ºC, and a constant screw speed of 230 rpm (24.1 rad/s). During processing the mass flow rate was determined, …
Sensory Evaluation Of Barley Chocolate Chip Cookies By Consumers With Different Demographic Background And Eating Patterns, Maria Botero Omary, Kurt A. Rosentrater, Douglas L. Lewis, Elizabeth Arndt, Diana J. Frost, Lauren M. Winstone
Sensory Evaluation Of Barley Chocolate Chip Cookies By Consumers With Different Demographic Background And Eating Patterns, Maria Botero Omary, Kurt A. Rosentrater, Douglas L. Lewis, Elizabeth Arndt, Diana J. Frost, Lauren M. Winstone
Kurt A. Rosentrater
Health organizations have recommended an increase in consumption of whole grains, total dietary fiber, and soluble fiber to help reduce the potential risk factor for the development of type-2 diabetes, obesity, and cardiovascular disease, among others. The purpose of this project was to determine the sensory characteristics of chocolate chip (CC) cookies containing a high-soluble fiber whole barley flour (HSFWB). Cookies with 0, 30, 50, and 70% HSFWB were evaluated for appearance, color, flavor, texture, and overall acceptability using a 9-point hedonic scale. Forty-nine students, faculty, and staff tested the cookies on three different days. Demographic and behavioral data on …
Diels−Alder Cycloaddition Strategy For Kinetic Resolution Of Chiral Pyrazolidinones, Mukund P. Sibi, Keisuke Kawashima, Levi M. Stanley
Diels−Alder Cycloaddition Strategy For Kinetic Resolution Of Chiral Pyrazolidinones, Mukund P. Sibi, Keisuke Kawashima, Levi M. Stanley
Levi M. Stanley
A rare example of the application of a catalytic, enantioselective Diels−Alder cycloaddition to affect a kinetic resolution has been developed. Chiral pyrazolidinones are resolved with high selectivity through a process that utilizes a relay of stereochemical information from a permanent chiral center to a fluxional chiral center to enhance the inherent selectivity of the chiral Lewis acid catalyst.
Catalyzing Transformation: Conditions In Extension Educational Environments That Promote Change, Nancy K. Fran, Barry A. Garst, Sarah Baughman, Chris Smith, Brian Peters
Catalyzing Transformation: Conditions In Extension Educational Environments That Promote Change, Nancy K. Fran, Barry A. Garst, Sarah Baughman, Chris Smith, Brian Peters
Nancy K. Franz
Extension faculty and administrators have suggested Cooperative Extension's goal and niche is transformative education—to bring about deep change in individuals, families, and communities. However even though transformative learning appears to be a desirable approach to Extension education, few scholars and practitioners have examined the conditions in Extension learning environments that promote transformation. In fact, Extension agents and faculty ask what they can do to increase the likelihood their work will result in transformation. The research reported here explored conditions that catalyze transformation in two Extension educational contexts: 1) Cornell Cooperative Extension agent/specialist work teams and 2) Virginia 4-H Camps.
Measurement Of Sticky Point Temperature Of Coffee Powder With A Rheometer, Rumela Bhadra, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Measurement Of Sticky Point Temperature Of Coffee Powder With A Rheometer, Rumela Bhadra, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Kurt A. Rosentrater
Sticky point temperature (Ts) measurement for hygroscopic food and biomaterial powders is traditionally performed with complex glass instruments. This property is used to characterize material stickiness, which substantially affects the flow and physical behavior of powders. In this research study we developed a new methodology to measure sticky point temperature using a rheometer, and validated our Ts data with previously published coffee powder data. Our Ts measurement using a rheometer was performed in two replications. The behavior of Ts as a function of moisture content (%, db) was observed to be non-linear. After 16% (db) moisture content, however, there were …
Surface Geometry Of C60 On Ag(111), H. I. Li, K. Pussi, K. J. Hanna, Lin-Lin Wang, Duane D. Johnson, H.-P. Cheng, H. Shin, S. Curtarolo, W. Moritz, J. A. Smerdon, R. Mcgrath, R. D. Diehl
Surface Geometry Of C60 On Ag(111), H. I. Li, K. Pussi, K. J. Hanna, Lin-Lin Wang, Duane D. Johnson, H.-P. Cheng, H. Shin, S. Curtarolo, W. Moritz, J. A. Smerdon, R. Mcgrath, R. D. Diehl
Duane D. Johnson
The geometry of adsorbed C60 influences its collective properties. We report the first dynamical low-energy electron diffraction study to determine the geometry of a C60 monolayer, Ag(111)−(23√×23√)30°−C60, and related density functional theory calculations. The stable monolayer has C60 molecules in vacancies that result from the displacement of surface atoms. C60 bonds with hexagons down, with their mirror planes parallel to that of the substrate. The results indicate that vacancy structures are the rule rather than the exception for C60 monolayers on close-packed metal surfaces.
Exploiting The Versatility Of Ionic Liquids In Separation Science: Determination Of Low-Volatility Aliphatic Hydrocarbons And Fatty Acid Methyl Esters Using Headspace Solid-Phase Microextraction Coupled To Gas Chromatography, Yunjing Meng, Veronica Pino, Jared L. Anderson
Exploiting The Versatility Of Ionic Liquids In Separation Science: Determination Of Low-Volatility Aliphatic Hydrocarbons And Fatty Acid Methyl Esters Using Headspace Solid-Phase Microextraction Coupled To Gas Chromatography, Yunjing Meng, Veronica Pino, Jared L. Anderson
Jared L. Anderson
The determination of high-molecular weight aliphatic hydrocarbons and fatty acid methyl esters possessing high boiling points and low vapor pressures was performed using a headspace solid-phase microextraction gas chromatography (HS-SPME-GC) method comprised entirely of ionic liquids (ILs). The method utilizes three independently structurally engineered ILs in which the imparted physical and chemical properties make them compatible with the requirements of each component of the method. Component one is composed of a thermally stable IL solvent used to increase the equilibrium concentration of analytes in the HS, component two is a SPME sorbent coating based on a polymeric ionic liquid (PIL) …
Examining The Obstacles To Broadening Participation In Computing: Evidence From A Survey Of Professional Workers, Ronald A. Ash, Leanne Coder, Brandon Dupont, Joshua L. Rosenbloom
Examining The Obstacles To Broadening Participation In Computing: Evidence From A Survey Of Professional Workers, Ronald A. Ash, Leanne Coder, Brandon Dupont, Joshua L. Rosenbloom
Joshua L. Rosenbloom
This article describes the results of a survey of professional workers that was designed to explore the underlying reasons for the widely documented underrepresentation of women in information technology (IT) jobs. Our analysis suggests that it is different occupational personalities between men and women rather than the demanding nature of IT work that is largely responsible for the relatively few women in IT occupations. We discuss the implications these results have for policies that are designed to create greater gender equity in the rapidly growing IT industries.
Enantioselective, Iridium-Catalyzed Monoallylation Of Ammonia, Mark J. Pouy, Levi M. Stanley, John F. Hartwig
Enantioselective, Iridium-Catalyzed Monoallylation Of Ammonia, Mark J. Pouy, Levi M. Stanley, John F. Hartwig
Levi M. Stanley
Highly enantioselective, iridium-catalyzed monoallylations of ammonia are reported. These reactions occur with electron-neutral, -rich, and -poor cinnamyl carbonates, alkyl and trityloxy-substituted allylic carbonates, and dienyl carbonates in moderate to good yields and excellent enantioselectivities. This process is enabled by the use of an iridium catalyst that does not require a Lewis acid for activation and that is stable toward a large excess of ammonia. This selective formation of primary allylic amines allows for one-pot syntheses of heterodiallylamines and allylic amides that are not otherwise accessible via iridium-catalyzed allylic amination without the use of blocking groups and protective group manipulations.
Pattern Formation During The Evaporation Of A Colloidal Nanoliter Drop: A Numerical And Experimental Study, Rajneesh Bhardwaj, Xiaohua Fang, Daniel Attinger
Pattern Formation During The Evaporation Of A Colloidal Nanoliter Drop: A Numerical And Experimental Study, Rajneesh Bhardwaj, Xiaohua Fang, Daniel Attinger
Daniel Attinger
An efficient way to precisely pattern particles on solid surfaces is to dispense and evaporate colloidal drops, as for bioassays. The dried deposits often exhibit complex structures exemplified by the coffee ring pattern, where most particles have accumulated at the periphery of the deposit. In this work, the formation of deposits during the drying of nanoliter colloidal drops on a flat substrate is investigated numerically and experimentally. A finite-element numerical model is developed that solves the Navier–Stokes, heat and mass transport equations in a Lagrangian framework. The diffusion of vapor in the atmosphere is solved numerically, providing an exact boundary …
Survey Of Us Fuel Ethanol Plants, Jessica A. Saunders, Kurt A. Rosentrater
Survey Of Us Fuel Ethanol Plants, Jessica A. Saunders, Kurt A. Rosentrater
Kurt A. Rosentrater
The ethanol industry is growing in response to increased consumer demands for fuel as well as the renewable fuel standard. Corn ethanol processing creates the following products: 1/3 ethanol, 1/3 distillers grains, and 1/3 carbon dioxide. As the production of ethanol increases so does the generation of its coproducts, and viable uses continually need to be developed. A survey was mailed to operational US ethanol plants to determine current practices. It inquired about processes, equipment used, end products, and desired future directions for coproducts. Results indicated that approximately one-third of plant managers surveyed expressed a willingness to alter current drying …
Enhancing Accountability: Servsafe™ Impact Template Delivers, Renee Boyer, Matthew Benson, Heather Boyd, Mena Forrester, Nancy K. Franz, Karen Gehrt, Patsy Pelland, Kirsten Roan
Enhancing Accountability: Servsafe™ Impact Template Delivers, Renee Boyer, Matthew Benson, Heather Boyd, Mena Forrester, Nancy K. Franz, Karen Gehrt, Patsy Pelland, Kirsten Roan
Nancy K. Franz
Generating statewide impact data from Extension programs can be challenging. To streamline reporting, Extension specialists, with the help of county agents and administrators, generated a statewide impact statement for the ServSafe™ program in Virginia. This template includes knowledge gain, behavior change, and economic impact from participants generated from current standardized evaluation methods used by all Extension educators across the state. Providing this template for agents resulted in easier, more consistent yearly reporting for those agents administering the program.
Quantitative Prediction Of Twinning Stress In Fcc Alloys: Application To Cu-Al, Sandeep A. Kibey, Lin-Lin Wang, J. B. Liu, H. T. Johnson, H. Sehitoglu, Duane D. Johnson
Quantitative Prediction Of Twinning Stress In Fcc Alloys: Application To Cu-Al, Sandeep A. Kibey, Lin-Lin Wang, J. B. Liu, H. T. Johnson, H. Sehitoglu, Duane D. Johnson
Duane D. Johnson
Twinning is one of most prevalent deformation mechanisms in materials. Having established a quantitative theory to predict onset twinning stress τcrit in fcc elemental metals from their generalized planar-fault-energy (GPFE) surface, we exemplify its use in alloys where the Suzuki effect (i.e., solute energetically favors residing at and near planar faults) is operative; specifically, we apply it in Cu-xAl (x is 0, 5, and 8.3 at. %) in comparison with experimental data. We compute the GPFE via density-functional theory, and we predict the solute dependence of the GPFE and τcrit, in agreement with measured values. We show that τcrit correlates …
Labor-Market Regimes In U.S. Economic History, Joshua L. Rosenbloom, William A. Sundstrom
Labor-Market Regimes In U.S. Economic History, Joshua L. Rosenbloom, William A. Sundstrom
Joshua L. Rosenbloom
In much economic analysis it is a convenient fiction to suppose that changes over time in wages and employment are determined by shifts in supply or demand within a more or less competitive market framework Indeed, this framework has been effectively deployed to understand many episodes in American economic history. We argue here, however, that by minimizing the role of labor-market institutions such an approach is incomplete. Drawing on the history of American labor markets over two centuries, we argue that institutions—by which we mean both formal and informal rules that constrain the choices of economic agents—have played a significant …
A Comparison Of Measurement Procedures Used To Determine The Bulk Density Of Distillers Dried Grains With Solubles (Ddgs), Clairmont L. Clementson, Kurt A. Rosentrater, Klein E. Heleji
A Comparison Of Measurement Procedures Used To Determine The Bulk Density Of Distillers Dried Grains With Solubles (Ddgs), Clairmont L. Clementson, Kurt A. Rosentrater, Klein E. Heleji
Kurt A. Rosentrater
The production of corn-based ethanol in the U.S. has been dramatically increasing in recent years, and consequently so has the quantity of co-product, distillers dried grains with soluble (DDGS) generated from this processing sector. DDGS is sold as a commodity for animal feed and like corn; its bulk physical and chemical properties are quality attributes normally used in trading by merchandisers. Consistency in product quality have been cause for concern in the industry and the lack of standard methods for physical and chemical property determination does potentially confound the issue, especially when results of attributes measured by different methods have …
Physical And Flow Properties Of Regular And Reduced Fat Distillers Dried Grains With Solubles (Ddgs), Vykundeshwari Ganesan, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Physical And Flow Properties Of Regular And Reduced Fat Distillers Dried Grains With Solubles (Ddgs), Vykundeshwari Ganesan, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Kurt A. Rosentrater
With the remarkable growth of the US fuel ethanol industry in the past decade, large quantities of corn-based distillers dried grains with solubles (DDGS) are now being produced. Flowability of DDGS has become a problem throughout the industry, as it is often restricted by caking and bridging during storage and transport. The objective of this study was to quantify physical and flow properties of commercially produced unmodified (9.3% db fat) and reduced fat (2.1% db) DDGS to determine if fat level affects flowability. The compressive modulus of reduced fat DDGS was 28.2% higher than unmodified DDGS, but shear stress resistance …