116,041 research outputs found
RETAIL DEMAND FOR WHOLE VS. LOW-FAT MILK: NEW PERSPECTIVES ON LOSS LEADER PRICING
This analysis employed retail scanner data to investigate the demand for fluid mild differentiated by fat content. All own-price elasticities were significant and negative. Demand for low-fat milk was elastic, while demand for whole milk was inelastic. This article addresses the use of milk as a loss leader.Demand and Price Analysis, Research and Development/Tech Change/Emerging Technologies,
Nonclassicality of a photon-subtracted Gaussian field
Published versio
Fabrication of Asymmetric Electrode Pairs with Nanometer Separation Made of Two Distinct Metals
We report a simple and reproducible method to fabricate two metallic
electrodes made of different metals with a nanometer-sized gap. These
electrodes are fabricated by defining a pair of gold electrodes
lithographically and electrodepositing a second metal onto one of them. The
method enables the fabrication of pairs of metallic electrodes that exhibit
distinct magnetic properties or work functions. The utility of this technique
is demonstrated by making single-electron tunneling devices incorporating 2-nm
gold nanocrystals.Comment: 3 figures, 1 colo
Failure of Delayed Feedback Deep Brain Stimulation for Intermittent Pathological Synchronization in Parkinson's Disease
Suppression of excessively synchronous beta-band oscillatory activity in the
brain is believed to suppress hypokinetic motor symptoms of Parkinson's
disease. Recently, a lot of interest has been devoted to desynchronizing
delayed feedback deep brain stimulation (DBS). This type of synchrony control
was shown to destabilize the synchronized state in networks of simple model
oscillators as well as in networks of coupled model neurons. However, the
dynamics of the neural activity in Parkinson's disease exhibits complex
intermittent synchronous patterns, far from the idealized synchronous dynamics
used to study the delayed feedback stimulation. This study explores the action
of delayed feedback stimulation on partially synchronized oscillatory dynamics,
similar to what one observes experimentally in parkinsonian patients. We employ
a model of the basal ganglia networks which reproduces experimentally observed
fine temporal structure of the synchronous dynamics. When the parameters of our
model are such that the synchrony is unphysiologically strong, the feedback
exerts a desynchronizing action. However, when the network is tuned to
reproduce the highly variable temporal patterns observed experimentally, the
same kind of delayed feedback may actually increase the synchrony. As network
parameters are changed from the range which produces complete synchrony to
those favoring less synchronous dynamics, desynchronizing delayed feedback may
gradually turn into synchronizing stimulation. This suggests that delayed
feedback DBS in Parkinson's disease may boost rather than suppress
synchronization and is unlikely to be clinically successful. The study also
indicates that delayed feedback stimulation may not necessarily exhibit a
desynchronization effect when acting on a physiologically realistic partially
synchronous dynamics, and provides an example of how to estimate the
stimulation effect.Comment: 19 pages, 8 figure
Formation and Evolution of Single Molecule Junctions
We analyze the formation and evolution statistics of single molecule
junctions bonded to gold electrodes using amine, methyl sulfide and dimethyl
phosphine link groups by measuring conductance as a function of junction
elongation. For each link, maximum elongation and formation probability
increase with molecular length, strongly suggesting that processes other than
just metal-molecule bond breakage play a key role in junction evolution under
stress. Density functional theory calculations of adiabatic trajectories show
sequences of atomic-scale changes in junction structure, including shifts in
attachment point, that account for the long conductance plateau lengths
observed.Comment: 10 pages, 4 figures, submitte
On the Use of Valuation Mechanisms to Measure Consumers' Willingness to Pay for Novel Products: A Comparison of Hypothetical and Non-Hypothetical Values
Willingness to pay (WTP) estimates for novel products are needed to assess consumers' valuation of these products as well as for product adoption and optimal pricing strategies. Using experiments in a retail setting, we compare hypothetical and non-hypothetical WTP values between a Becker-DeGroot-Marshak (BDM) auction mechanism and conjoint analysis. Our results suggest that the auction WTP values are higher than conjoint analysis WTP values. Moreover, the hypothetical WTP values are higher than the non-hypothetical WTP values in both elicitation mechanisms.Conjoint analysis, willingness-to-pay, auction, hypothetical, non-hypothetical, Consumer/Household Economics, Institutional and Behavioral Economics,
Finite element solution of low bond number sloshing
The dynamics of liquid propellant in a low Bond number environment which are critical to the design of spacecraft systems with respect to orbital propellant transfer and attitude control system were investigated. Digital computer programs were developed for the determination of liquid free surface equilibrium shape, lateral slosh natural vibration mode shapes, and frequencies for a liquid in a container of arbitrary axisymmetric shape with surface tension forces the same order of magnitude as acceleration forces. A finite volume element representation of the liquid was used for the vibration analysis. The liquid free surface equilibrium shapes were computed for several tanks at various contact angles and ullage volumes. A configuration was selected for vibration analysis and lateral slosh mode shapes and natural frequencies were obtained. Results are documented
True high-order VCO-based ADC
A novel approach to use a voltage-controlled oscillator (VCO) as the first integrator of a high-order continuous-time delta-sigma modulator (CT-DSM) is presented. In the proposed architecture, the VCO is combined with a digital up-down counter to implement the first integrator of the CT-DSM. Thus, the first integrator is digital-friendly and hence can maximally benefit from technological scaling
From Farm to School: An Alternative Market for Texas Citrus
Crop Production/Industries, Food Consumption/Nutrition/Food Safety,
The Power Spectrum of Galaxies in the Nearby Universe
We compute the power spectrum of galaxy density fluctuations in a recently
completed redshift survey of optically-selected galaxies in the southern
hemisphere (SSRS2). The amplitude and shape of the SSRS2 power spectrum are
consistent with results of the Center for Astrophysics redshift survey of the
northern hemisphere (CfA2), including the abrupt change of slope on a scale of
30-50Mpc/h; these results are reproducible for independent volumes of space and
variations are consistent with the errors estimated from mock surveys. Taken
together, the SSRS2 and CfA2 form a complete sample of 14,383 galaxies which
covers one-third of the sky. The power spectrum of this larger sample continues
to rise on scales up to ~ 200Mpc/h, with weak evidence for flattening on the
largest scales. The SSRS2+CfA2 power spectrum and the power spectrum
constraints implied by COBE are well-matched by an Omega*h ~ 0.2,
Omega+lambda_0=1 CDM model with minimal biasing of optically-selected galaxies.Comment: Accepted for publication in The Astrophysical Journal Letters, Sept.
23, 1994. 10 pages uuencoded compressed postscript, including two figures.
JHU-9410200
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