1,280 research outputs found
Electric Vehicles: Rolling Over Barriers and Merging with Regulation
Electric vehicles are merging into the mainstream of transportation. Although the technology still comprises a small fraction of the current market, it ismorewidely available due to competitivepricing, technological improvements, and available state and federal incentives. The benefits of electric vehicles include reduced fossil fuel emissions and associated climate change mitigation, new independence from oil-driven policies in foreignmarkets and international relations, and potential opportunities for increasing and complementing renewable energy electric resources. The risks of widespread electric vehicle deployment are largely thought to involve potential impacts on existingutility generation,distribution, and transmission systems and how the costs of any needed changes to these resources should be allocated among customers, including those not utilizing the technology. This Article argues that the potential risks of increased electric vehicle deployment can be tempered by targeted involvement of the state agencies tasked with regulating electricity, for example in requiring utilities to take the lead on public education and in mandating certain rate structures that minimize load impacts. It provides a road map for state agencies to answer the novel legal and policy questions posed by traveling vehicles as electric load, and also examines how state involvement can actually mitigate the barriers to further growth in this nascent sector by allowing increased opportunities for competition, information gathering and dissemination, andminimization of unnecessary regulatory burdens, particularly at this early stage of deployment. This Article makes the case that, given the scope of potential environmental and social benefits, state agencies can and should actively explore and develop policy mechanisms to integrate electric vehicle growth into the electric regulation space
Dynamics of Chain Molecules
Dr. Stockmayer is the Albert W. Smith Professor Emeritus at Dartmouth College, a position he has held since 1979. In 1935, Dr. Stockrnayer graduated from Massachusetts Institute of Technology. After two years at Oxford University, he returned to M.1.T. and earned his Ph.D. degree in 1940. His thesis, directed by James A. Beattie, was on the equation of state of gas mixtures. Dr. Stockrnayer became an Instructor in Chemistry at M.I.T. in 1939. Except for a two-year stint at Columbia University, he taught at M.I.T. until he moved to Dartmouth in 1961. In addition to his position as Albert W. Smith Professor Emeritus, he is also a part-time teacher and researcher and an associate editor of Macromolecules. Dr. Stockrnayer also contributes articles on physics and macromolecular chemistry to scientific journals. Dr. Stockrnayer\u27s honors include election to the Academy of Arts and Sciences in 1946 and membership in the National Academy of Sciences in 1956. He has received the ACS Award in Polymer Chemistry, the Peter Debye Award in Physical Chemistry, the Theodore William Richards Medal (Northeastern Section, ACS), the APS High Polymer Physics Prize, and the National Medal of Science (1987). Dr. Stockrnayer is an honorary fellow of Jesus College, Oxford, and has honorary degrees from Strasbourg and from Dartmouth College.
His Work: Dr. Stockmayer has worked on a variety of theoretical problems in the dynamics and statistical mechanics of macromolecules, including light scattering, chain transformations, and chain dynamics. He has also supervised useful experimental work in these areas, making extensive use of dielectric relaxation techniques.
(This information was taken from the Distinguished Scientist Lecture Series Program 1988-1989).
Recording of lecture not available.https://digitalcommons.bard.edu/dsls_1988_1989/1005/thumbnail.jp
Glass transition of an epoxy resin induced by temperature, pressure and chemical conversion: a configurational entropy rationale
A comparative study is reported on the dynamics of a glass-forming epoxy
resin when the glass transition is approached through different paths: cooling,
compression, and polymerization. In particular, the influence of temperature,
pressure and chemical conversion on the dynamics has been investigated by
dielectric spectroscopy. Deep similarities are found in dynamic properties. A
unified reading of our experimental results for the structural relaxation time
is given in the framework of the Adam-Gibbs theory. The quantitative agreement
with the experimental data is remarkable, joined with physical values of the
fitting parameters. In particular, the fitting function of the isothermal
tau(P) data gives a well reasonable prediction for the molar thermal expansion
of the neat system, and the fitting function of the isobaric-isothermal tau(C)
data under step- polymerization conforms to the prediction of diverging tau at
complete conversion of the system.Comment: 16 pages, 8 figures, from the talk given at the 4th International
Discussion Meeting on Relaxations in Complex Systems (IDMRCS), Hersonissos,
Helaklion, Crete (Greece), 17-23 June 200
Technical Parameters of Plastics (Mercox Cl-2B and Various Methylmethacrylates) Used in Scanning Electron Microscopy of Vascular Corrosion Casts
The most frequently used resins for vascular corrosion casting Mercox Cl-2B, Mercox Cl-2B diluted with methylmethacrylate (MMA) monomer and various self prepared MMA and hydroxyproyl-methacrylate mixtures were tested with regard to their thermostability, shrinkage, viscosity and replication quality. It was found that tempering of the plastics improves their thermostability with the exception of Mercox Cl-2B and that shrinkage depends on the amount of monomers a resin contains. In detail; Mercox Cl-2B has the lowest shrinkage (8.018%) whereas a hydroxypropyl-methacrylate mixture possessed the highest (20.408%). But, on the other hand, viscosity decreases with the quantity of monomers. All resins tested were able to replicate structures of 260nm height but the resins\u27 quality of replication was found to be limited by the effects of shrinkage. Finally, a method to estimate the blood volume of organs and tissues with the help of vascular corrosion casts is given
Two Simple Approaches to Sol-Gel Transition
We represent a theory of polymer gelation as an analogue of liquid-glass
transition in which elastic fields of stress and strain shear components appear
spontaneously as a consequence of the cross-linking of macromolecules. This
circumstance is explained on the basis of obvious combinatoric arguments as
well as a synergetic Lorenz system, where the strain acts as an order
parameter, a conjugate field is reduced to the elastic stress, and the number
of cross-links is a control parameter. Both the combinatoric and synergetic
approaches show that an anomalous slow dependence of the shear modulus on the
number of cross-links is obtained.Comment: 10 pages, LaTe
Dynamics of Diblock Copolymers in Dilute Solutions
We consider the dynamics of freely translating and rotating diblock (A-B),
Gaussian copolymers, in dilute solutions. Using the multiple scattering
technique, we have computed the diffusion and the friction coefficients D_AB
and Zeta_AB, and the change Eta_AB in the viscosity of the solution as
functions of x = N_A/N and t = l_B/l_A, where N_A, N are the number of segments
of the A block and of the whole copolymer, respectively, and l_A, l_B are the
Kuhn lengths of the A and B blocks. Specific regimes that maximize the
efficiency of separation of copolymers with distinct "t" values, have been
identified.Comment: 20 pages Revtex, 7 eps figures, needs epsf.tex and amssymb.sty,
submitted to Macromolecule
Global hydrodynamic analysis of the molecular flexibility of galactomannans
In the past, intrinsic viscosity and sedimentation velocity analyses have been used separately to assess the conformation and flexibility of guar and locust bean gum galactomannans based on worm-like chain and semi-flexible coil models. Publication of a new global method combining data sets of both intrinsic viscosity and sedimentation coefficient with molecular weight, and minimising a target (error) function now permits a more robust analysis. Using this approach, values for the persistence length of (10 ± 2) nm for guar and (7 ± 1) nm for locust bean gum are returned if the mass per unit length ML is floated as a variable. Using a fixed mass per unit length based on the known compositional data of each galactomannan yields a similar value for Lp in both cases, (8 ± 1) nm for guar and (9 ± 1) nm for locust bean gum, with combined set of data yielding (9 ± 1) nm: within experimental error the flexibilities of both galactomannans are very similar. © 2007 Elsevier Ltd. All rights reserved
- …